Description:BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bobbin preparing device that performs preparation for unwinding a yarn from a supply bobbin in a winding device.

2. Description of the Related Art
A fly-waste removing device that removes fly waste of a rotary cutter provided in a bobbin preparing device is disclosed in Japanese Utility Model Application Publication No. H3-35977. The fly-waste removing device includes a sucking device and the rotary cutter. The sucking device sucks a bottom bunch yarn present on a supply bobbin by generating a suction current at a yarn suction port.
The rotary cutter cuts the bottom bunch yarn sucked by the sucking device. If the yarn suction port is jammed with the fly waste, a motor that rotates the rotary cutter gets overloaded. Upon detecting that the motor that rotates the rotary cutter is overloaded, the fly-waste removing device temporarily rotates the motor in a reverse direction. Accordingly, even when the fly waste is jammed in the yarn suction port, such a jamming can be removed.
However, when yarn clogging occurs, the clogged yarn cannot be removed just by rotating the cutting device in the reverse direction. The yarn clogging is a phenomenon in which the yarn of the supply bobbin gets clogged in the sucking device or a cutting device (rotary cutter).

SUMMARY OF THE INVENTION
The present invention has been made in view of the above circumstances. It is an object of the present invention to provide a bobbin preparing device capable of automatically removing a clogged yarn even when yarn clogging occurs at the time of sucking and removing a bottom bunch yarn.
According to one aspect of the present invention, a bobbin preparing device having below configuration is provided. The bobbin preparing device performs preparation for winding a yarn in a winding device on a supply bobbin. The bobbin preparing device includes a bobbin rotating device, a sucking device, a cutting device, and a control device. The bobbin rotating device rotates a supply bobbin around a shaft of a core tube of the supply bobbin and in a direction in which a bottom bunch yarn wound around a lower part of the core tube is unwound. The sucking device sucks the bottom bunch yarn unwound by the bobbin rotating device. The cutting device includes a plate shaped fixed blade and a ring shaped movable blade, and cuts the bottom bunch yarn sucked by the sucking device by rotating the movable blade. The control device performs a first control for rotating the movable blade in a direction opposite to that in which the movable blade is rotated at the time of cutting the bottom bunch yarn, and then performs a second control for rotating the supply bobbin by the bobbin rotating device in a direction opposite to that in which the bobbin rotating device rotates the supply bobbin at the time of unwinding the bottom bunch yarn, upon detecting that a yarn clogging in which a yarn of the supply bobbin is clogged in the sucking device or the cutting device has occurred.
The above and other objects, features, advantages and technical and industrial significance of this invention will be better understood by reading the following detailed description of presently preferred embodiments of the invention, when considered in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram showing a schematic configuration of a supply bobbin feeding-type winder that includes a bobbin preparing device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a bunch unwinding device.
FIG. 3 is a perspective view of a fixed blade and a movable blade.
FIG. 4 is a block diagram showing a configuration in which a yarn lump is wound around a supply bobbin and then removed.
FIG. 5 is a flowchart showing processes of a control relating to a bunch unwinding device.
FIG. 6 is a schematic plan view showing an example in which a bottom bunch yarn is cut by the bunch unwinding device.
FIG. 7 is a schematic plan view showing an example in which the bottom bunch yarn is clogged in a cutting device because of the yarn lump.
FIG. 8 is a schematic plan view showing an example in which it is made easier to pull the bottom bunch yarn by rotating the movable blade in a reverse direction.
FIG. 9 is a schematic plan view showing an example in which the bottom bunch yarn and the yarn lump is wound around the supply bobbin by rotating the supply bobbin in the reverse direction.

DETAILED DESCRIPTION
Exemplary embodiments of the present invention are explained below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a schematic configuration of a supply bobbin feeding-type winder 1.
As shown in FIG. 1, the supply bobbin feeding-type winder 1 includes a supply bobbin feeding device 2, a bobbin preparing device 3, and an automatic winder (winding device) 4. Each of the supply bobbin feeding device 2, the bobbin preparing device 3, and the automatic winder 4 includes a conveying path to convey a tray 6 on which a supply bobbin 5 can be set. In the following explanation, an upstream and a downstream of a transport direction of the conveying path are simply referred to as an “upstream” and a “downstream”.
The supply bobbin feeding device 2 supplies the supply bobbin 5 on which a yarn layer 5b is formed. The supply bobbin 5 is formed by winding a yarn (spun yarn), which has been generated by spinning, onto a core tube 5a. Subsequently, a bottom bunch is formed in a lower part of the core tube 5a of the supply bobbin 5 by performing a straight winding of the yarn. In the following explanation, a yarn that constitutes the bottom bunch is referred to as a bottom bunch yarn 5c. The bobbin preparing device 3 performs preparation so that winding of the yarn present on the supply bobbin 5 conveyed from the supply bobbin feeding device 2 can be performed in the automatic winder 4. The automatic winder 4 produces a package by unwinding the yarn that has been wound around the supply bobbin 5.
The bobbin preparing device 3 includes a preparation path 11, a supplying path 12, an accumulating path 13, and a returning path 14 as the conveying paths for conveying the tray 6. Each conveying path conveys the tray 6 by using a not-shown conveyor mechanism.
The preparation path 11 is a path for conveying the supply bobbin 5 set by a bobbin setting device 26 of the supply bobbin feeding device 2. The preparation of the supply bobbin 5 explained above is performed on the preparation path 11. A bunch unwinding device 21, a yarn end pulling device 22, and a yarn end preparing device 23 are arranged on the preparation path 11.
The bunch unwinding device 21 sucks the bottom bunch yarn 5c of the supply bobbin 5 and cuts the same. The yarn end pulling device 22 performs a process to cut a backwind yarn that had been wound around a circumference of the supply bobbin 5 thereby forming a yarn end. The yarn end preparing device 23 sucks the yarn end formed by the yarn end pulling device 22 and inserts the same inside the core tube 5a. The process of inserting the yarn end inside the core tube 5a is referred to as end finding.
A downstream end of the preparation path 11 branches out into the supplying path 12 and the accumulating path (accumulating section) 13. A switching device 24 is provided at a location at which the preparation path 11 branches out into the supplying path 12 and the accumulating path 13. The switching device 24 can switch conveying states between a state in which the tray 6 is conveyed to the supplying path 12 and a state in which the tray 6 is conveyed to the accumulating path 13.
The supplying path 12 is a path for conveying to the automatic winder 4 the supply bobbin 5 on which a process is performed successfully by the bunch unwinding device 21, the yarn end pulling device 22, and the yarn end preparing device 23. The yarn present on the supply bobbin 5 conveyed to the automatic winder 4 is unwound after the supply bobbin 5 reaches the automatic winder 4. The supply bobbin 5 from which the yarn is completely unwound (that is, the core tube 5a) is again conveyed toward the bobbin preparing device 3. The supply bobbin 5 that has reached the bobbin preparing device 3 is conveyed along the returning path 14.
The accumulating path 13 is a path to convey again to the bunch unwinding device 21, the yarn end pulling device 22, or the yarn end preparing device 23 the supply bobbin 5 on which a process performed by the bunch unwinding device 21, the yarn end pulling device 22, or the yarn end preparing device 23 has failed. Processes, such as an end finding process, are again executed on the supply bobbin 5 that is conveyed to the bunch unwinding device 21, the yarn end pulling device 22, or the yarn end preparing device 23. Regardless of such a processing, the supply bobbin 5 on which the processing has failed is temporarily accumulated on the accumulating path 13. The supply bobbin 5 accumulated on the accumulating path 13 is discharged by the bobbin preparing device 3 at an appropriate timing. A downstream side of the accumulating path 13 is connected to the returning path 14. When a predetermined number of the supply bobbins 5 are accumulated on the accumulating path 13, those supply bobbins 5 are conveyed to a bobbin removing device 25 along the returning path 14 thereby discharging the bobbins. Alternatively, the operator can be notified that the predetermined number of the supply bobbins 5 have accumulated, and the operator can manually remove and discharge the supply bobbins 5.
The bobbin removing device 25 and the bobbin setting device 26 are provided on the returning path 14. The bobbin removing device 25 removes the supply bobbin 5 from the tray 6 to collect the same. The tray 6 from which the supply bobbin 5 has been removed by the bobbin removing device 25 is conveyed to the bobbin setting device 26. The bobbin setting device 26 sets on the tray 6 a new supply bobbin 5 on which the yarn has been wound by the supply bobbin feeding device 2. The tray 6 on which the new supply bobbin 5 has been set by the bobbin setting device 26 is then conveyed along the preparation path 11.
Configuration of the bunch unwinding device 21 will be explained in detail with reference to FIGS. 2 to 4.
As shown in FIG. 2, the bunch unwinding device 21 includes a bobbin rotating device 30, a sucking device 50, a cutting device 60, and a rotation sensor 70. A part of the components that constitute the bunch unwinding device 21 are housed in a housing 40.
The bobbin rotating device 30 includes a driving roller 31 and a tray driving motor 32. The driving roller 31 contacts the tray 6 that has stopped in front of the bunch unwinding device 21. The tray driving motor 32 generates a rotational driving force. A rotation direction, a rotational speed, and a rotation amount of the tray driving motor 32 is controllable. The driving roller 31 is rotated by the rotational driving force generated by the tray driving motor 32. With such a configuration, the tray 6 and the supply bobbin 5 can be rotated. A rotation center of the rotation of the tray 6 and a rotation center of the supply bobbin 5 are the same as an axial position of the tray 6 and an axial position of the supply bobbin 5.
As shown in FIG. 4, the tray driving motor 32 is controlled by a control device 100. The control device 100 includes an arithmetic device such as CPU and like, a storage device such as SSD, HDD, or a flash memory and the like, and a communication device. The control device 100 controls various parts of the bobbin preparing device 3 (for example, the switching device 24, the tray driving motor 32, and the like explained above) by executing a computer program in the arithmetic device.
The sucking device 50 sucks the bottom bunch yarn 5c of the supply bobbin 5. The sucking device 50 includes a sucking pipe 51, a suction block 52, and a suction port 53. The sucking pipe 51 is connected to a not-shown negative pressure source. Consequently, a suction current is generated inside the sucking pipe 51. The suction block 52 is positioned inside the housing 40, and it communicates with the sucking pipe 51. The suction port 53 communicates with the suction block 52. With such a configuration, a suction current can be generated at the suction port 53. The suction port 53 is arranged so as to face the bottom bunch of the supply bobbin 5 that has stopped in front of the bunch unwinding device 21. Accordingly, the bottom bunch yarn 5c can be sucked from the suction port 53.
The cutting device 60 cuts the bottom bunch yarn 5c sucked by the sucking device 50. The cutting device 60 includes a fixed blade 61, a movable blade 62, a cutting motor 63, a first pulley (rotating member) 64, a belt 65, and a second pulley 66.
The bottom bunch yarn 5c is cut by the fixed blade 61 and the movable blade 62. The fixed blade 61 is arranged on a path on which the bottom bunch yarn 5c sucked from the suction port 53 passes. In other words, the fixed blade 61 is arranged only at one location. The movable blade 62 has a plurality of opening parts 62b formed on a ring-shaped main body section 62a. The opening part 62b is a rectangular through hole formed at an equal interval on the main body section 62a. As shown in FIG. 3, the opening part 62b is formed at a first angle θ interval with respect to the center of the main body section 62a. The movable blade 62 rotates around an axial position thereof by the action of the rotational driving force generated by the cutting motor 63. The bottom bunch yarn 5c is sucked so as to pass through the opening part 62b. By rotating the movable blade 62 in such a state, the bottom bunch yarn 5c is sandwiched between the opening part 62b and the fixed blade 61. The bottom bunch yarn 5c is cut by a shear force generated in this situation.
The cutting motor 63 generates a rotational driving force based on a command given by the control device 100. A rotation direction, a rotational speed, and a rotation amount of the cutting motor 63 are controllable. The rotational driving force generated by the cutting motor 63 is conveyed via an output shaft to the first pulley 64 arranged inside the housing 40. The belt 65 is wound around the first pulley 64. The second pulley 66 is arranged near the movable blade 62. An area near an axial location of the second pulley 66 is hollowed so as not to block a path through which the suction current passes. The second pulley 66 is firmly attached to the movable blade 62. With this configuration, the movable blade 62 can be rotated by the rotational driving force generated by the cutting motor 63. The fixed blade 61 is pivotably attached to the housing 40 of the cutting device 60 via a not-shown grooved pulley provided coaxially with the first pulley 64. The fixed blade 61 is swingable in the same direction as that of the blade thereof by the action of the grooved pulley. By causing the fixed blade 61 to swing in the same direction as that of the blade thereof, cutting efficiency is improved. Furthermore, because the fixed blade 61 does not always cut the yarn at the same position, wear and tear of the fixed blade 61 can be suppressed.
The rotation sensor 70 detects the rotation of the first pulley 64. The rotation sensor 70 is attached to the housing 40 or the cutting motor 63 such that the rotation sensor 70 can rotate relative to the first pulley 64. A not-shown magnet is provided on the first pulley 64. The rotation sensor 70 is a magnet sensor. By rotating the first pulley 64, a state of the rotation sensor can be switched between a state in which the rotation sensor 70 is near the magnet and a state in which the rotation sensor 70 is separated from the magnet. A detection result of the rotation sensor 70 is sent to the control device 100. Based on the detection result of the rotation sensor 70, the control device 100 can judge whether the first pulley 64 is rotating, that is, whether the movable blade 62 is rotating.
Process procedures performed by the bunch unwinding device 21 are explained below with reference to FIGS. 5 to 9.
First, the control device 100 judges whether the supply bobbin 5 has reached the bunch unwinding device 21 (Step S101). For example, an optical sensor that detects the supply bobbin 5 or the tray 6 is arranged near the bunch unwinding device 21, and the control device 100 performs this judgement based on the detection result of the optical sensor. Alternatively, instead of the optical sensor, a contact sensor can be used.
If the supply bobbin 5 has reached the bunch unwinding device 21, the bottom bunch yarn 5c is sucked by the sucking device 50 (Step S102). In the present embodiment, the sucking device 50 is continuously generating the suction current. However, the sucking device 50 can be configured to generate the suction current only when the supply bobbin 5 has reached the bunch unwinding device 21.
Subsequently, the control device 100 controls the tray driving motor 32 of the bobbin rotating device 30, and unwinds the bottom bunch yarn 5c by rotating the supply bobbin 5 (Step S103). In the following explanation, rotation of the supply bobbin 5 for unwinding the bottom bunch yarn 5c is referred to as rotation in a normal direction. The bottom bunch yarn 5c is unwound by sucking the bottom bunch yarn 5c while the supply bobbin 5 is caused to rotate in the normal direction.
Next, the control device 100 controls the cutting motor 63 of the cutting device 60, and cuts the bottom bunch yarn 5c by rotating the movable blade 62 (Step S104). In the following explanation, rotation of the movable blade 62 for cutting the bottom bunch yarn 5c is referred to as the rotation in the normal direction. By rotating the movable blade 62 in the normal direction, the bottom bunch yarn 5c can be cut by sandwiching the bottom bunch yarn 5c between an edge of the opening part 62b of the movable blade 62 and the fixed blade 61.
An example in which cutting of the bottom bunch yarn 5c is successful is shown in FIG. 6. By rotating the supply bobbin 5 in the normal direction, unwinding the bottom bunch yarn 5c, and rotating the movable blade 62 in the normal direction from a state shown on the left side in FIG. 6, the bottom bunch yarn 5c is cut as shown in the right side in FIG. 6.
An example in which cutting of the bottom bunch yarn 5c has failed is shown in FIG. 7. A yarn lump 5d is formed on the bottom bunch yarn 5c shown in FIG. 7. When the bottom bunch yarn 5c that includes the yarn lump 5d is sucked, the yarn lump 5d may get sandwiched and clogged between the edge of the opening part 62b and the fixed blade 61, and the bottom bunch yarn 5c may not be cut as shown on the right side of FIG. 7. Moreover, because the bottom bunch yarn 5c cannot be cut, the movable blade 62 cannot be rotated any more. Furthermore, in some cases, the yarn lump 5d passes between the fixed blade 61 and the movable blade 62, and an uneven portion beyond the fixed blade 61 and the movable blade 62 (a part of the sucking device 50 or the cutting device 60) may get clogged.
In other words, when the cutting of the bottom bunch yarn 5c fails, a malfunctioning of the movable blade 62 in which the movable blade 62 does not rotate occurs even when the control device 100 has sent the command to the cutting motor 63 to rotate the movable blade 62. After sending the command to the cutting motor 63 to rotate the movable blade 62 in the normal direction, the control device 100 judges whether the malfunctioning of the movable blade 62 has occurred (Step S105). The control device 100 judges whether the malfunctioning of the movable blade 62 has occurred based on the detection result of the rotation sensor 70. In other words, when the cutting of the bottom bunch yarn 5c is successful as shown in FIG. 6, the rotation does not stop in between because the bottom bunch yarn 5c is not clogged in the cutting device 60 (between the fixed blade 61 and the movable blade 62). On the other hand, when the cutting of the bottom bunch yarn 5c fails as shown in FIG. 7, the rotation is stopped in between because the fixed blade 61 and the movable blade 62 are caught in the bottom bunch yarn 5c, resulting in yarn clogging. Accordingly, when the detection result of the rotation sensor 70 indicates that the rotation of the movable blade 62 has stopped in between, the control device 100 judges that the malfunctioning of the movable blade 62 has occurred.
Upon judging that the malfunctioning of the movable blade 62 has not occurred, the control device 100 controls the yarn end pulling device 22 and the yarn end preparing device 23 and performs pulling of the yarn end from the supply bobbin 5 and preparing of the yarn end (Step S106). Subsequently, the control device 100 controls the switching device 24 to convey the supply bobbin 5 to the supplying path 12 (Step S107). Furthermore, if the pulling of the yarn end or the preparing of the yarn end fails, the control device 100 conveys the supply bobbin 5 to the accumulating path 13.
Moreover, upon judging that the malfunctioning of the movable blade 62 has occurred, the control device 100 controls the cutting motor 63, and rotates the movable blade 62 in a reverse direction until the opening part 62b of the movable blade 62 and the suction port 53 overlap (Step S108; FIG. 8; a first control). Rotation of the movable blade 62 in the reverse direction refers to rotation of the movable blade 62 in a direction opposite to that in which the movable blade 62 rotates when rotated in the normal direction. Moreover, when the opening part 62b and the suction port 53 overlap, at least a part of the opening part 62b and the suction port 53 (particularly, the hallow portion via which the yarn can pass) overlap when viewed from an axial direction of the suction port 53. When the opening part 62b and the suction port 53 are overlapped, the yarn lump 5d can be easily moved from the movable blade 62 to the supply bobbin 5 side. Furthermore, it is desirable that the rotation amount for which the movable blade 62 rotates in the reverse direction is smaller than the first angle θ. This is because, if the rotation amount exceeds the first angle θ, the movable blade 62 rotates past the location at which the suction port 53 and the opening part 62b overlap.
In this process, if the bottom bunch yarn 5c breaks undesirably when the movable blade 62 is rotated in the reverse direction, the yarn lump 5d cannot be retrieved from the movable blade 62, and the bunch unwinding device 21 cannot be restored. Therefore, in the present embodiment, the rotational speed at which the movable blade 62 is rotated in the reverse direction is slowed down to make it difficult for the bottom bunch yarn 5c to break. Specifically, the rotational speed at which the movable blade 62 is rotated in the reverse direction is slower than that at which the movable blade 62 is rotated in the normal direction. However, the rotational speed at which the movable blade 62 is rotated in the reverse direction is not limited to what is mentioned above, and can be the same as that at which the movable blade 62 is rotated in the normal direction.
Next, the control device 100 controls the tray driving motor 32 to wind the bottom bunch yarn 5c by rotating the supply bobbin 5 in the reverse direction (Step S109; FIG. 9; a second control). Rotation of the supply bobbin 5 in the reverse direction refers to rotation of the supply bobbin 5 in a direction opposite to that in which the supply bobbin 5 rotates when rotated in the normal direction. Accordingly, the yarn lump 5d can be wound around the supply bobbin 5. For example, it is desirable that the number of rotations of the supply bobbin 5 is two rotations or more. Furthermore, it is preferable to adjust this number of rotations in the reverse direction according to the distance between the movable blade 62 and the supply bobbin 5. Moreover, similar to the movable blade 62, it is desirable that the rotational speed at which the supply bobbin 5 is rotated in the reverse direction is slower than that at which the supply bobbin 5 is rotated in the normal direction. However, the rotational speed at which the supply bobbin 5 is rotated in the reverse direction is not limited to what is mentioned above, and can be the same as that at which the supply bobbin 5 is rotated in the normal direction.
Because the yarn lump 5d is wound around the supply bobbin 5 in the process of Step S109, the yarn from such a supply bobbin 5 cannot be unwound in the automatic winder 4. Therefore, the control device 100 omits the pulling of the yarn end from the supply bobbin 5 and the preparing of the yarn end, and conveys the supply bobbin 5 to the accumulating path 13 by controlling the switching device 24 (Step S110). Accordingly, even when the bottom bunch yarn 5c is clogged in the bunch unwinding device 21 because of the supply bobbin 5 that includes the yarn lump 5d, yarn clogging can be automatically recovered.
Furthermore, in some cases, the yarn lump 5d clogged in the cutting device 60 cannot be removed even when the processes of Steps S108 and S109 are performed. Therefore, the following processes can be added. In other words, after performing the process of Step S109, the control device 100 can control the cutting motor 63 to rotate the movable blade 62, and obtain the detection result of the rotation sensor 70. When the detection result of the rotation sensor 70 indicates that the movable blade 62 is rotating, it can be confirmed that the yarn lump 5d caught on the movable blade 62 is discharged from the bunch unwinding device 21. Thereafter, the control device 100 performs the process of the Step S110.
On the other hand, when the detection result of the rotation sensor 70 does not indicate that the movable blade 62 is rotating, the control device 100 performs the processes of Steps S108 and S109 again to discharge the yarn lump 5d caught in the movable blade 62. Accordingly, even when the yarn lump 5d is not discharged from the bunch unwinding device 21 in the process performed one time, the yarn lump 5d can be discharged from the bunch unwinding device 21 by performing the process multiple times. Furthermore, an upper limit can be set for the number of times the process for discharging the yarn lump 5d is repeated. For example, when the yarn lump 5d is not discharged even after the process for discharging the yarn lump 5d is performed two times, a process in which discharging of the yarn lump 5d is stopped, and an operator is notified and the like can be performed.
As explained above, the bobbin preparing device 3 according to the present embodiment includes the bobbin rotating device 30, the sucking device 50, the cutting device 60, and the control device 100. The bobbin rotating device 30 rotates the supply bobbin 5 in a direction in which the bottom bunch yarn 5c wound on the lower part of the core tube 5a of the supply bobbin 5 is unwound. The sucking device 50 sucks the bottom bunch yarn 5c that is unwound by the bobbin rotating device 30. The cutting device 60 includes the fixed blade 61 and the movable blade 62, and cuts the bottom bunch yarn 5c sucked by the sucking device 50 by rotating the movable blade 62. Upon detecting that the yarn clogging in which the yarn of the supply bobbin 5 is clogged in the sucking device 50 or the cutting device 60 has occurred, the control device 100 performs the second control to rotate the supply bobbin 5 by the bobbin rotating device 30 in a direction opposite to that in which the bobbin rotating device 30 rotates the supply bobbin 5 at the time of unwinding the bottom bunch yarn 5c after the performing the first control to rotate the movable blade 62 in the direction opposite to that in which the movable blade 62 is rotated at the time of cutting the bottom bunch yarn 5c.
Accordingly, by rotating the cutting device 60 in the reverse direction, a state in which the clogged yarn can be easily pulled can be created. Subsequently, the clogged yarn can be pulled and wound around the supply bobbin 5 by rotating the bobbin rotating device 30 in the reverse direction. Therefore, yarn clogging can be automatically removed.
In the bobbin preparing device 3 according to the present embodiment, the rotational speed at which the movable blade 62 is rotated during the first control is slower than that at which the movable blade 62 is rotated to cut the bottom bunch yarn 5c.
Accordingly, the yarn does not break easily when the cutting device 60 is rotated in the reverse direction.
In the bobbin preparing device 3 according to the present embodiment, the cutting device 60 includes a driving section (cutting motor 63), the first pulley 64, and the rotation sensor 70. The driving section generates the rotational driving force. The first pulley 64 rotates by the rotational driving force of the driving section and conveys the rotational driving force to the movable blade 62. The rotation sensor 70 detects the rotation of the first pulley 64. The control device 100 judges whether the yarn clogging has occurred based on the detection result of the rotation sensor 70.
Accordingly, occurrence of the yarn clogging can be detected by using a simple and precise method.
In the bobbin preparing device 3 according to the present embodiment, the movable blade 62 has a shape in which the plurality of the opening parts 62b is formed on the ring-shaped main body section 62a, and the yarn is cut by sandwiching the yarn between the edge of the opening part 62b and the fixed blade 61. In the first control, the control device 100 rotates the movable blade 62 in the direction opposite to that in which the movable blade 62 is rotated at the time of cutting such that the suction port 53 via which the sucking device 50 sucks the bottom bunch yarn 5c overlaps with the opening part 62b of the movable blade 62, and the opening part 62b via which the bottom bunch yarn 5c is sucked does not overlap with the fixed blade 61.
Accordingly, the clogged yarn can be easily pulled.
In the bobbin preparing device 3 according to the present embodiment, the opening part 62b is formed at the first angle θ interval with respect to the center of the main body section 62a. The rotation angle at which the control device 100 rotates the movable blade 62 during the first control is smaller than the first angle θ. More specifically, the rotation angle at which the control device 100 rotates the movable blade 62 during the first control is between the range of 20 to 40 degrees. Such an angle range is adjusted according to the value of the first angle θ.
Accordingly, the clogged yarn can be prevented from being guided again inside the cutting device 60.
In the bobbin preparing device 3 according to the present embodiment, the control device 100 rotates the supply bobbin 5 two times or more by using the bobbin rotating device 30 in a direction opposite to that in which the supply bobbin 5 is rotated at the time of unwinding the bottom bunch yarn 5c.
Accordingly, the clogged yarn can be pulled and wound around the supply bobbin 5.
In the bobbin preparing device 3 according to the present embodiment, after performing the first control and the second control, the control device 100 conveys to the downstream side in a transport direction the supply bobbin 5 for which it is judged that the yarn clogging has occurred, and accepts a next supply bobbin 5.
Accordingly, because an operation can be resumed after the yarn clogging is removed, a decrease in a rate of operation can be suppressed.
The bobbin preparing device 3 according to the present embodiment includes the accumulating path 13 on which the supply bobbin 5 for which preparation for winding the yarn in the automatic winder 4 could not be performed is temporarily accumulated. The control device 100 performs a control for conveying the supply bobbin 5 for which it is judged that the yarn clogging has occurred toward the accumulating path 13.
Accordingly, because the supply bobbin 5 for which it is judged that the yarn clogging has occurred can be accumulated, unnecessary supply bobbins can be processed efficiently compared to a configuration in which the supply bobbin 5 is removed each time.
Exemplary embodiments of the present invention are explained above. The configuration explained above can, however, be modified as explained below.
The rotation sensor 70 can be attached to a member that rotates integrally with the movable blade 62, and such a member is not limited to the first pulley 64. For example, the rotation sensor 70 can be attached to the second pulley 66. Moreover, the rotation can be detected by using a component other than the magnet sensor.
The flowchart shown in the above embodiment is exemplary, and a part of processes can be omitted, the contents of a part of processes can be changed, or new processes can be added.
In the above embodiments, the control device 100 of the bobbin preparing device 3 performs the process shown in FIG. 5; however, a configuration can be such that another control device (for example, a control device provided in the bunch unwinding device 21) performs the process.
The accumulating path 13 according to the present embodiment is a path on which the supply bobbin 5 that cannot be supplied to the automatic winder 4 is temporarily accumulated; however, the supply bobbin 5 can be accumulated in a configuration other than the accumulating path. For example, a box and the like in which the supply bobbin 5 and the like on which the yarn lump 5d is wound in the bunch unwinding device 21 can be dumped can be provided, and the supply bobbin 5 can be conveyed to this box.
In the above embodiments, the automatic winder is cited as an example of the winding device; however, the winding device can be other than the automatic winder as long as the device is capable of winding the yarn.
An object of the present invention is as mentioned above, and the means to achieve the object and the advantageous effect thereof will be explained below.
According to one aspect of the present invention, a bobbin preparing device having below configuration is provided. The bobbin preparing device performs preparation for winding a yarn in a winding device on a supply bobbin. The bobbin preparing device includes a bobbin rotating device, a sucking device, a cutting device, and a control device. The bobbin rotating device rotates a supply bobbin around a shaft of a core tube of the supply bobbin and in a direction in which a bottom bunch yarn wound around a lower part of the core tube is unwound. The sucking device sucks the bottom bunch yarn unwound by the bobbin rotating device. The cutting device includes a plate shaped fixed blade and a ring shaped movable blade, and cuts the bottom bunch yarn sucked by the sucking device by rotating the movable blade. The control device performs a first control for rotating the movable blade in a direction opposite to that in which the movable blade is rotated at the time of cutting the bottom bunch yarn, and then performs a second control for rotating the supply bobbin by the bobbin rotating device in a direction opposite to that in which the bobbin rotating device rotates the supply bobbin at the time of unwinding the bottom bunch yarn, upon detecting that a yarn clogging in which a yarn of the supply bobbin is clogged in the sucking device or the cutting device has occurred.
Accordingly, by rotating the cutting device in the reverse direction, a state in which the clogged yarn can be easily pulled can be created. Subsequently, the clogged yarn can be pulled and wound around the supply bobbin by rotating the bobbin rotating device in the reverse direction. Therefore, yarn clogging can be automatically removed.
In the above bobbin preparing device, it is preferable that a rotational speed at which the movable blade is rotated in the first control is slower than the rotational speed at which the movable blade is rotated to cut the bottom bunch yarn.
Accordingly, the yarn does not break easily when the cutting device is rotated in the reverse direction.
It is preferable that the above bobbin preparing device has below configuration. The cutting device includes a driving section, a rotating member, a rotation sensor. The driving section generates a rotational driving force. The rotating member rotates by the rotational driving force of the driving section, and conveys the rotational driving force to the movable blade. The rotation sensor detects rotation of the rotating member. The control device judges whether the yarn clogging has occurred based on a detection result of the rotation sensor.
Accordingly, occurrence of the yarn clogging can be detected by using a simple and precise method.
It is preferable that the above bobbin preparing device has below configuration. The movable blade has a shape in which a plurality of opening parts is formed on a ring-shaped main body section, and cuts a yarn by sandwiching the yarn between an edge of the opening part and the fixed blade. During the first control, the control device rotates the movable blade in a direction opposite to that in which the movable blade is rotated at the time of cutting the bottom bunch yarn such that a suction port via which the bottom bunch yarn is sucked by the sucking device and the opening part of the movable blade overlap, and that the opening part via which the bottom bunch yarn is being sucked and the fixed blade do not overlap.
Accordingly, the clogged yarn can be easily pulled.
It is preferable that the above bobbin preparing device has below configuration. The opening part is formed at a first angle interval with respect to a center of the main body section. A rotation angle at which the control device rotates the movable blade during the first control is smaller than the first angle.
Accordingly, the clogged yarn can be prevented from being guided again inside the cutting device.
In the above bobbin preparing device, it is preferable that the control device causes the bobbin rotating device to rotate the supply bobbin in a direction opposite to that in which the supply bobbin is rotated at the time of unwinding the bottom bunch yarn for two times or more.
Accordingly, the clogged yarn can be pulled and wound around the supply bobbin.
In the above bobbin preparing device, it is preferable that after performing the first control and the second control, the control device conveys to a downstream side of a transport direction the supply bobbin for which it is judged that the yarn clogging has occurred, and receives a next supply bobbin.
Accordingly, because an operation can be resumed after the yarn clogging is removed, a decrease in a rate of operation can be suppressed.
It is preferable that the above bobbin preparing device has below configuration. The bobbin preparing device includes an accumulating section in which the supply bobbin on which preparation for winding the yarn in the winding device is not performed is temporarily accumulated. The control device performs a control for conveying to the accumulating section the supply bobbin for which it is judged that the yarn clogging has occurred.
Accordingly, because the supply bobbin in which the yarn clogging has occurred can be accumulated, unnecessary supply bobbins can be processed efficiently compared to a configuration in which the supply bobbin is removed each time.
In the above explanation, the meaning of “a plurality of” also includes “a predetermined number of”.
Although the invention has been explained with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the scope of the claims.
, Claims:We claim:

1. A bobbin preparing device (3) that performs preparation for winding a yarn in a winding device (4) on a supply bobbin (5), comprising:
a bobbin rotating device (30) that rotates a supply bobbin (5) around a shaft of a core tube (5a) of the supply bobbin (5) and in a direction in which a bottom bunch yarn (5c) wound around a lower part of the core tube (5a) is unwound;
a sucking device (50) that sucks the bottom bunch yarn (5c) unwound by the bobbin rotating device (30);
a cutting device (60) that includes a plate shaped fixed blade (61) and a ring shaped movable blade (62), and cuts the bottom bunch yarn (5c) sucked by the sucking device (50) by rotating the movable blade (62); and
a control device (100) that performs a first control for rotating the movable blade (62) in a direction opposite to that in which the movable blade (62) is rotated at the time of cutting the bottom bunch yarn (5c), and then performs a second control for rotating the supply bobbin (5) by the bobbin rotating device (30) in a direction opposite to that in which the bobbin rotating device (30) rotates the supply bobbin (5) at the time of unwinding the bottom bunch yarn (5c), upon detecting that a yarn clogging in which a yarn of the supply bobbin (5) is clogged in the sucking device (50) or the cutting device (60) has occurred.

2. The bobbin preparing device (3) as claimed in Claim 1, wherein a rotational speed at which the movable blade (62) is rotated in the first control is slower than the rotational speed at which the movable blade (62) is rotated to cut the bottom bunch yarn (5c).

3. The bobbin preparing device (3) as claimed in Claim 1 or 2, wherein the cutting device (60) includes
a driving section (63) that generates a rotational driving force;
a rotating member (64) that rotates by the rotational driving force of the driving section (63), and conveys the rotational driving force to the movable blade (62); and
a rotation sensor (70) that detects rotation of the rotating member (64), and
the control device (100) judges whether the yarn clogging has occurred based on a detection result of the rotation sensor (70).

4. The bobbin preparing device (3) as claimed in one of Claims 1 to 3, wherein
the movable blade (62) has a shape in which a plurality of opening parts (62b) is formed on a ring-shaped main body section (62a), and cuts a yarn by sandwiching the yarn between an edge of the opening part (62b) and the fixed blade (61), and
during the first control the control device (100) rotates the movable blade (62) in a direction opposite to that in which the movable blade (62) is rotated at the time of cutting the bottom bunch yarn (5c) such that a suction port (53) via which the bottom bunch yarn (5c) is sucked by the sucking device (50) and the opening part (62b) of the movable blade (62) overlap, and that the opening part (62b) via which the bottom bunch yarn (5c) is being sucked and the fixed blade (61) do not overlap.

5. The bobbin preparing device (3) as claimed in Claim 4, wherein the opening part (62b) is formed at a first angle interval with respect to a center of the main body section (62a), and a rotation angle at which the control device (100) rotates the movable blade (62) during the first control is smaller than the first angle.

6. The bobbin preparing device (3) as claimed in one of Claims 1 to 5, wherein the control device (100) causes the bobbin rotating device (30) to rotate the supply bobbin (5) in a direction opposite to that in which the supply bobbin (5) is rotated at the time of unwinding the bottom bunch yarn (5c) for two times or more.

7. The bobbin preparing device (3) as claimed in one of Claims 1 to 6, wherein, after performing the first control and the second control, the control device (100) conveys to a downstream side of a transport direction the supply bobbin (5) for which it is judged that the yarn clogging has occurred, and receives a next supply bobbin (5).

8. The bobbin preparing device (3) as claimed in Claim 7, comprising:
an accumulating section (13) in which the supply bobbin (5) on which preparation for winding the yarn in the winding device (4) is not performed is temporarily accumulated, and
the control device (100) performs a control for conveying to the accumulating section (13) the supply bobbin (5) for which it is judged that the yarn clogging has occurred.