Specification
The present invention relates to a method of manufacturing a yarn and a device for manufacturing the yean.
The invention relates to the positioning of a sliver end at a filled flat can which, after having been filled on a draw frame of the textile industry, is to be exchanged for an empty flat can.
The draw frame processes sliver and deposits the sliver in a cycloid shape in layers in the flat can. Once the flat can is filled, the flat can is exchanged for an empty one. For this purpose, the sliver has to be severed and the sliver end deposited at the edge of the flat can.
If the severed sliver end lies at a random position on the can edge, it has to be retrieved by complex automatic devices, and delays occur in positioning the flat can in the transport system or in the further processing machine. Ultimately, this produces delay in further processing.
In order to avoid these disadvantages, the use of a holding device for mounting the sliver end in a defined
position on the can edge has been proposed. The holding device is positioned addition at the can edge. The sliver end has to be deposited in this holding device. It is awkward always to use an additional mounting on the flat can and to design the can edge such that the holding device can be installed.
However, it is not possible to dispense with reliable positioning of the sliver end. It is a requirement of automation for subsequent work steps in a spinning machine. Using reliable positioning of the sliver end at the can edge which can always be reproduced enables the complexity in subsequent work steps or in placing the sliver at the further processing machine to be kept small or to be reduced.
If the sliver end could be reliably deposited at the flat can at a predetermined position on the can edge which is always reproducible without an additional mounting being necessary, this would contribute significantly to a reduction in complexity.
Seen from this point of view, Indian Patent Application N©! 831/MAS/94/succeeds in positioning the sliver end at the can edge reproducibly without a mounting. Positioning of the sliver end at the flat can is achieved in that, taking as a starting point the stopped
position of the flat can, the mouth of the revolving plate is stopped in a manner positioned with respect to the longitudinal axis of the flat can in such a way that the loops of the sliver are drawn off on displacing the flat can such that the sliver comes to lie, at the end of the displacement travel, in the central region of the end face of the flat can and can then be severed by a severing means. The filled flat can is in the stopped position below the revolving plate and is displaced from this position and only then is the sliver severed. As a result of the high static friction of the sliver, as the loops of sliver are unwound automatically, it is possible that the unwound sliver is affected.
In another construction for positioning the sliver end, the following is proposed: after positioning the mouth of the revolving plate in a stopped position of the flat can, first the sliver is severed by means of a mechanical severing device between the pair of calendar rollers and the sliver guide channel. After severing, the flat can is displaced into a transfer position. Here, the severed sliver end is drawn out of the sliver guide channel and hangs on the end wall of the flat can at a predetermined and with a specified length. The fact that the positioning procedure requires a complete severing device of known type represents a complexity. Severing devices often have the disadvantage that the
sliver is deflected during the severing procedure and then the severed sliver end hangs on the edge of the sliver guide channel. This hinders re-starting of the machine.
The object of the invention is, in positioning the sliver end, to avoid a reduction in the quality of the sliver and at the same time further to reduce the complexity for positioning the sliver end at a flat can.
When the full condition of the flat can is achieved, reciprocating motion thereof is ended and the delivery of sliver is stopped. The pair of calender rollers and the revolving plate are stopped. The flat can is at the end point of its reciprocation, with one end face below the revolving plate. This is the stopped position, where transfer of the flat can to a subsequent transport system is ensured. The mouth of the revolving plate is also positioned in this stopped position of the flat can, that is to say the mouth of the revolving plate is always stopped in the same position in relation to the stopped position of the flat can. Using this defined position of the mouth of the revolving plate, it is possible to determine the point on the edge of the end wall of the flat can at which the sliver end will be deposited.
Since the sliver is deposited in a cycloid shape, positioning the mouth of the revolving plate has an effect on the formation of the final loop. The mouth of the revolving plate is stopped in a manner positioned in relation to the longitudinal axis of the flat can. The positions are selectable. It is thus possible to determine the position at which the loop end leads into the mouth of the revolving plate (sliver guide channel).
The positioning of a sliver is achieved by cooperation between a drafting device and a displacing means. The process for positioning a sliver end is characterized in that, in the stopped position of the flat can, a drafting point is formed in the sliver between the pair of calender rollers and the sliver guide channel by means of a drafting device and, by subsequently displacing the flat can by means of the displacing means from the stopped position to a transfer position, the sliver is severed at the drafting point and the severed sliver end is drawn out of the sliver guide channel, with the result that it is positioned at the edge of the end wall of the flat can with a constant length. A drafting point is formed by the drafting device forming a clamping point spaced by at least one staple length below the pair of calender rollers by clamping the sliver, and this clamping point being displaced by the drafting device transversely with respect to the
direction of conveying the sliver until drafting occurs. A drafting point is formed between the clamping point and the pair of calender rollers. Then, the drafting device releases the clamping of the sliver.
The drafting point could also be formed by the drafting device being guided in the direction of the sliver guide channel. The drafting device can be a movable clamping device or a movable mechanical lever or stop. The subsequent displacement of the flat can be achieved using a displacing means. A displacing means can result from the reciprocating device and/or an additional transport means for flat cans. The movement sequences of the drafting device and the displacing means are controlled by the machine control means.
These process steps for positioning a sliver end have the advantage that they simplify the overall procedure. This means that a conventional complex severing device for sliver can be dispensed with. Although the sliver is deflected out of the direction of conveying by means of the drafting point, it is guided back into the direction of conveying by the displacement of the displacing means before the severing procedure. Furthermore, the severed sliver end, hanging on the pair of calender rollers, is positioned in the sliver guide channel.
With severing by displacement, the drafting point always guarantees a defined severing point of the sliver. The device for carrying out the process has provided a displacing means for a flat can and a drafting device, which are connected to control means. The drafting device has as its operative means at least a controllable and movable clamping arm and stop.
Positioning is achieved with less complexity the in the prior art. As a further advantage it is found that the length of the sliver end can be influenced in that the stopped position of the flat can additionally be varied somewhat.
Accordingly the present invention provides a method of manufacturing a yam show on a draw frame comprising the steps of processing sliver on a draw frame of a spinning machine conveying the sliver through a pair of calendar rollers into a sliver guide channel of a revolving plate, depositing the sliver in a cycloid shape, in a flat can, stopping delivery of the sliver to the can for changing the can, bringing the flat can into a stopped position starting from the stopped position of the flat can, stopping the mouth of the revolving plate so that it is positioned with respect to the flat can and transporting the flat can for further processing of the sliver to produce a yam wherein, in the stopped position of the flat can a drafting point of the sliver is formed between the pair of calendar rollers and the sliver guide channel by means of a drafting device and, by subsequently displacing the flat can by displacing means from the stopped position into a transfer Position the
silver is severed at the drafting point and the severed silver is drawn out of the silver guide channel, with the result that it is positioned at the edge of the end wail of the flat can with a constant length.
Accordingly the present invention also provides a device for carrying out the method as herein described above, said device comprising a displacing means for displacing a flat can and a drafting device are for faring a drafting point of the sliver are provided which are connected to a control means.
The mode of operation and the features essential to the invention are explained below with reference to the accompanying drawings, in which,
Figure 1 shows a draw frame having a reciprocating device;
Figure 2 shows the association of the revolving plate with the flat can,
Figure 3 shows a flat can in the stopped position.
Figure 3a shows displacement of the flat can out of the stopped position,
Figure 3b shows the flat can in the transfer position,
Figure 3c shows the position of the sliver end,
Figure 4 shows the initial position of sliver severing.
Figure 4a shows clamping of the sliver,
Figure 4b shows displacement of the clamping point.
Figure 4c shows drafting in the sliver, and
Figure 4d shows opening of the clamping point.
Figure 1 shows diagrammatically a draw frame 1 of the textile industry and a flat can 14 and the displacing means 16 thereof (reciprocating device) and the buffer 15 of a transport system for flat cans. The sliver 11 is drafted in a drafting unit 2 within the draw frame 1. The drafting unit 2 is illustrated by the pairs of drafting unit rollers 3, 3' ; 4, 4' ; 5, 5' . At the outlet of the drafting unit 2 is a measuring member 17
for measuring the delivered sliver length. The sliver 11 is delivered to a pair of calender rollers 6, 6' and conveyed by the pair of calender rollers 6, 6' into a sliver guide channel 8 of a revolving plate 7. The revolving plate 7 rotates so that the sliver is deposited via the mouth 9 of the revolving plate in a flat can 14 lying underneath. The flat can 14 has a rectangular base surface. In the empty condition, a movable can plate is located below or at the level of the upper can edge. As the can increasingly fills, the can plate is moved downwards in the direction of the can base against the action of a spring lying underneath. The flat can 14 has narrow end walls, the end wall LSW and the end wall RSW. The flat can is located on reciprocating device 160. The reciprocating device 160 has a drive (not illustrated here) with a control device. During the filling procedure, the flat can 14 is made to reciprocate below the revolving plate between the two reversal points A and B of its path of reciprocation AB. The flat can thus moves between the two illustrated positions of the flat can 14 and the flat can 14' (dashed lines). As a result of the rotation of the revolving plate 7 and the reciprocation undergone by the flat can, the sliver is deposited in a cycloid shape on the can plate of the flat can. Deposition takes place from one end wall of the flat can to the other end wall and vice versa. A path of
deposition from one end wall to the other in each case forms one layer of sliver loops. A filled flat can has a plurality of such layers. The speed of reciprocation of the flat can 14 is matched to the delivery speed of the revolving plate 7. Start-up, operation and braking of the revolving plate and of the flat can take place synchronously. If the measuring member 17 for measuring the delivered sliver length records that the limit value of the delivered sliver length has been reached, then at the same time it delivers a signal to the machine control means 13. The machine control means 13 acts in relation to the drives for the revolving plate 7 and the reciprocating device 160 such that it causes the latter to be stopped at a defined moment. This stopping is carried out such that the flat can 14 when stopped achieves a position close to or at the reversal point B, that is to say the end wall RSW is close to or at the reversal point B and the end wall LSW is in the region below the revolving plate 7. The flat can 14 is thus in the stopped position SP on the path of reciprocation AB. This stopped position SP could be varied somewhat by stopping in the vicinity of the reversal point. This can bring about an influence on the length of the future sliver end.
Figure 2 shows diagrammatically the association of the revolving plate 7 with the flat can in plan view. The
flat can 14 is in the stopped position SP on the path of reciprocation AB. The revolving plate 7 is above the flat can 14. The position of the revolving plate 7 is positioned with respect to the stopped position SP of the flat can 14, that is to say the revolving plate 7 is always stopped for example such that the mouth 9 of the sliver guide channel 8 always comes to a stop in the same position. The position of the mouth 9 is advantageously set such that the sliver 11 is held perpendicular along the longitudinal axis LA of the flat can. This corresponds to the position 90 of the mouth 9. A second possibility is that the revolving plate is turned through 180' such that its mouth 9' reaches the position 90' . However, other positions of the mouth 9 of the revolving plate are also conceivable. The position of the mouth 9 of the revolving plate is used to influence deposition of the last loop. It is thus possible to determine the position at which the loop end leads into the mouth of the revolving plate. The selection of other positions depends on the work step of displacement, which will be explained below.
Figure 3 shows that the flat can 14 has stopped in the stopped position SP. At the same time, the delivery of sliver 11 by the pair of calender rollers 6, 6' is stopped. This stopping is brought about by the machine control means 13. The sliver 11 hangs in the sliver
guide channel 8, passes through the sliver guide channel and lies in the flat can 14. A drafting device 12 now receives from the machine control means 13 the signal to draft the sliver between the pair of calender rollers 6, 6' and the inlet opening 10 of the sliver guide channel 8, that is to say to form a drafting point.
Figure 3a shows that the flat can 14 is now displaced out of the stopped position SP by means of the displacing means 16 in the direction of a transfer position C. Here, the drafting point is severed and the sliver end is drawn out of the sliver guide channel 8 by the can movement. In Figure 3b, the can 14 has reached the transfer position C. The sliver end E hangs down at the end wall LSW of the flat can 14. Since the revolving plate 7 has for example been positioned to have its mouth 9 along the longitudinal axis LA, the sliver end E is deposited in the central region of the end wall LSW (Fig. 3c).
Figures 4 to 4d show the formation of a drafting point in the sliver using a drafting device. Figure 4 shows, in a diagrammatic plan view, the starting position of the drafting device, that is to say the operative means clamping arm 20, stop 22 and adjusting devices 21 and 23 thereof. Furthermore, the inlet opening 10 of the sliver guide channel 8 in which the sliver 11 is located
is illustrated diagrammatically. A stop 22 is arranged next to the inlet opening 10. This stop is held mechanically and guided by an adjusting device 23. This adjusting device has a drive (not illustrated) and control means thereof, and a displacing mechanism. Opposite the stop 22 is a clamping arm 20, also arranged outside the inlet opening 10. This clamping arm 20 is held mechanically and guided by the adjusting device 21. This adjusting device 21 also has a drive (not illustrated) and control means thereof, and a displacing mechanism. The clamping arm 20 is moved by the adjusting device 21, for example transversely with respect to the direction of conveying the sliver 11. The clamping arm 20 deflects the sliver 11 and clamps it using the stop 22. The stop 22 and the clamping arm 20 form a clamping point KS. The clamping point KS is further transversely displaced, in a continuation of the movement made hitherto by the clamping arm 20. This displacement of the clamping point is shown by the comparison between Figures 4a and 4b. The clamping point KS is displaced until drafting of the sliver occurs. Figure 4c shows this drafting point. For better illustration, a change has been made to side view. The drafting point VS occurs between the clamping point KS and the pair of calender rollers 6, 6' . In dependence on the material to be processed, this path of displacement is determined and adjusted by controlling
the adjusting devices 21 and 23. Once drafting has been achieved and a drafting point has been formed, the clamping point KS is opened, that is to say the clamping arm 20 is moved back into its initial position. As the next step for positioning a sliver, the displacement of a flat can 14 to the transfer position C, illustrated in Figures 3 to 3c, is now carried out for example by using the reciprocating device 160. As a result of the displacement of the flat can the sliver is positioned with the drafting point precisely in the direction of conveying the sliver, that is to say in the sliver guide channel, and is severed precisely at the drafting point. At the same time, by displacing the flat can the sliver end is drawn out of the sliver guide channel of the revolving plate. The sliver hangs at a defined position on the flat can. At the same time, it is ensured that the sliver end always has a fixed length. From the transfer position C, the flat can 14 can now be displaced from the displacing means 16 by a transfer device (not illustrated) to the buffer 15 of a transport system. In this way, an empty can from the buffer 15 can be exchanged onto the displacing means 16. Can change is thus complete.
WE CLAIM
1. A method of manufacturing a yam comprising the steps of processing shver on a draw frame of a spinning machine, conveying the sliver through a pair of calendar rollers into a sliver guide channel of a revolving plate, depositing the sliver in a cycloid shape, in a flat can, stopping dehvery of the sliver to the can for changing the can, bringing the flat can into a stopped position, starting from the stopped position of the flat can, stopping the mouth of the revolving plate so that it is positioned with respect to the flat can and transporting the flat can for further processing of the sliver to produce a yarn wherein, in the stopped position (SP) of the flat can (14) a drafting point (VS) of the sliver (11) is formed between the pair of calendar rollers (6,6 ) and the sliver guide channel (8) by means of a drafting device (12) and, by subsequenfly displacing the flat can (14) displacing means (16) from the stopped position (SP) into a transfer position , (C) the sliver is severed at the drafting point and the severed sliver is drawn out of the sliver guide channel (8), with the result that it is positioned at the edge of the end wall of the flat can (14) with a constant length.
2. The method according to Claim 1, wherein a drafting point is formed by the drafting device (12) forming a clamping point (KS) spaced by at least, one staple length below the pair of calender rollers (6,6 ) by clamping the
sliver, and this clamping point (KS) is displaced by the drafting device (12) transversely with respect to the direction of conveying the sliver until drafting of the sliver occurs in the region of the clamping point (KS) and the pair of calender rollers (6,6) and clamping is then released.
3. The method according to claim 2, wherein the length of the sliver end (£) is altered by altering the placement of the stopped position (SP).
4. A device for manufcturing a yam by a method claimed in any one of the preceding claims, the said device comprising a pair of calender rollers (6, 6'); a revolving plate (7) ; a drafting device (12); and displacement means (16) for a flat can (14) wherein the device comprises a control means (13) which connects the said displacement means (16) for the flat can (14) and the said drafting device (12) to each other.
5. A device according to Claim 4, wherein the said drafting device (12) has as its operative means at least one clamping arm (20), a stop (22) and adjusting devices (21,23) therefor.
6. A device according to Claim 4, wherein the said displacing means
(16) is a reciprocating means (160).
7. A device according to Claim 4, wherein the said displacing means
(16) is a transporting means for a flat can.
8. A device according to Claim 4, wherein the said displacing means (16) are displaceable between a stopped position (SP) and a transfer position (C).
9. A method of manufacturing a yam substantially as hereinbefore described with reference to the accompanying drawings.
10. A device for manufacturing a yam substantially as hereinbefore
described with reference to the accompanying drawmgs.
