Description:TECHNICAL FIELD
[0001] The present disclosure relates to a yarn winding apparatus and an automatic winder.

BACKGROUND ART
[0002] A yarn winding apparatus is known, which winds yarn so as to form a package. The yarn winding apparatus includes a control device for controlling yarn winding. The control device is constituted of electronic components such as a CPU and a circuit board on which the electronic components are mounted, which are deteriorated by heat or static electricity. Therefore, it is necessary to dissipate heat and eliminate static electricity from the circuit board.
[0003] In a water cooling device of Japanese Patent No. 5920356, in order to cool a system board (substrate) on which a plurality of electronic components are mounted, a cooling plate is attached on each electronic component. Cooling water as coolant flows in the cooling plate. The water cooling device cools the electronic component via the cooling plate using the cooling water. In addition, the water cooling device includes a heat absorbing member for the cooling plate to absorb more heat, and a heat dissipating member for enhancing emissivity.
[0004] In a yarn winding apparatus, in order to prevent the circuit board or the like from being damaged by cotton fly, it is necessary to seal a space in which the control device is housed. As a result, it is difficult to dissipate heat by heat transfer using a fan or the like to circulate air. In addition, the space in which the control device is housed is not sufficient to dispose the water cooling device such as one disclosed in Japanese Patent No. 5920356.
[0005] Conventionally, the control device of the yarn winding apparatus is disposed inside a metal case (such as an aluminum die-cast case). Because the metal case has high thermal conductivity and high electrical conductivity, it is possible to dissipate heat by thermal conduction and eliminate static electricity from the circuit board, a power supplying component, and the like via the case.

SUMMARY OF INVENTION
TECHNICAL PROBLEM
[0006] However, in recent years, for reducing cost and weight of the yarn winding apparatus, a partially resin case may be adopted. A resin case has low thermal conductivity and low electrical conductivity, and hence heat dissipation effect and static elimination effect via the case are low.
[0007] It is an object of the present invention to enhance heat dissipation effect and static elimination effect in a yarn winding apparatus including a partially resin case.

TECHNICAL SOLUTION
[0008] Hereinafter, a plurality of embodiments are described as means for solving the problem. These embodiments can be arbitrarily combined as necessary.
[0009] A yarn winding apparatus of the present disclosure includes a winding unit, a circuit board, a power supplying unit, a plate member, and a case. The winding unit performs winding operation of winding yarn so as to form a package. The circuit board constitutes a control section configured to control the winding unit, and electronic components are mounted thereon. The power supplying unit supplies power to the circuit board. The power supplying unit is disposed on the plate member. At least a part of constituting members of the case is made of resin. The case encloses a space in which the circuit board, the power supplying unit and the plate member are housed. The plate member includes a conductive base material layer and a radiation layer formed on an outer surface of the base material layer. The radiation layer has a higher thermal emissivity than when the base material layer is exposed on the outer surface.
[0010] In this yarn winding apparatus, the radiation layer having high thermal emissivity is formed on the outer surface of the base material layer of the plate member, and hence it is possible to enhance heat dissipation effect for the circuit board and the power supplying unit.
[0011] In the yarn winding apparatus described above, the radiation layer may be made by plating. In this way, durability of the plate member is improved.
[0012] In the yarn winding apparatus described above, the radiation layer may have electrical conductivity. In this way, static elimination effect for the power supplying unit can be enhanced.
[0013] In the yarn winding apparatus described above, the radiation layer may be made by electrogalvanizing. Because electrogalvanizing has high electrical conductivity, static elimination effect for the power supplying unit can be enhanced more. In addition, the electrogalvanizing has high thermal emissivity, and hence heat dissipation effect for the circuit board and the power supplying unit can be enhanced more.
[0014] In the yarn winding apparatus described above, the radiation layer may be made by black color chrome plating. Because black color chrome plating has high electrical conductivity, static elimination effect for the power supplying unit can be enhanced more. In addition, the black color chrome plating has high thermal emissivity, and hence heat dissipation effect for the circuit board and the power supplying unit can be enhanced more.
[0015] In the yarn winding apparatus described above, the circuit board may be connected for grounding to the plate member. In this way, static elimination effect for the circuit board can be obtained.
[0016] In the yarn winding apparatus described above, when viewing the largest area surface of the constituting members of the case from the longitudinal direction, the plate member may be a single plate elongated in an up and down direction. In this way, strength of the case can be reinforced.
[0017] An automatic winder of the present disclosure includes a plurality of the yarn winding apparatuses of the present disclosure.

ADVANTAGEOUS EFFECTS
[0018] According to the yarn winding apparatus or the automatic winder of the present disclosure, heat dissipation effect and static elimination effect for the circuit board, the power supplying components, and the like are enhanced.

BRIEF DESCRIPTION OF DRAWINGS
[0019] Fig. 1 is a diagram illustrating a structure of an automatic winder.
Fig. 2 is a diagram illustrating a structure of a yarn winding apparatus.
Fig. 3 is a diagram of an inside of a control unit viewed from a right side surface of the yarn winding apparatus.
Fig. 4 is a perspective view of an appearance of the case viewed from the upper right side of yarn winding apparatus.
Fig. 5 is a front view of a plate member.

DESCRIPTION OF EMBODIMENTS
[0020] 1. First Embodiment
(1) Automatic Winder
Fig. 1 is a diagram illustrating a structure of an automatic winder 1. Note that in Figs. 1, 3, and 4, arrows denoted by front, back, up, down, left, and right indicate directions when viewing the automatic winder 1 from a front side.
[0021] The automatic winder 1 includes a plurality of yarn winding apparatuses 10 arranged side by side. Each of the yarn winding apparatuses 10 unwinds yarn 11 from a yarn feeding bobbin 20, and traverses the yarn 11, so as to form a package 23. A structure and operations of the yarn winding apparatus 10 will be described later in detail.
[0022] The automatic winder 1 includes a machine control device 12. The machine control device 12 can communicate with a control section 55 of each yarn winding apparatus 10. An operator of the automatic winder 1 appropriately operates the machine control device 12, and can integrally manage the plurality of yarn winding apparatuses 10. The machine control device 12 is equipped with a display 12a, and an input interface 12b. The display 12a displays information and the like related to set contents and/or states of the yarn winding apparatuses 10. When the operator appropriately operates the input interface 12b, setting work for the yarn winding apparatuses 10 can be performed.
[0023] The display 12a is a display device such as a liquid crystal display. The input interface 12b is an input device such as input keys or a touch panel. In addition, the display 12a and the input interface 12b that is the touch panel may be one unit.
[0024] The automatic winder 1 includes a doffing device 13. When the package 23 becomes a full volume (a state where a defined amount of yarn is wound) in any one of the yarn winding apparatuses 10, the doffing device 13 moves to the yarn winding apparatus 10, so as to detach the full volume package and to set an empty winding bobbin.
[0025] (2) Yarn Winding Apparatus
Fig. 2 is a diagram illustrating a structure of the yarn winding apparatus 10. The yarn winding apparatus 10 includes a winding unit 2 and a control unit 50 that controls the winding unit 2. The winding unit 2 performs a winding operation of winding the yarn 11 unwound from the yarn feeding bobbin 20 on a surface of a take-up pipe 22, so as to form the package 23. Note that the yarn winding apparatus 10 according to this embodiment is the yarn winding apparatus 10 of a drum type, but the yarn winding apparatus 10 may be a winding apparatus of an arm traverse type or a winding apparatus of a belt traverse type. In addition, the yarn winding apparatus 10 according to this embodiment is mounted in the automatic winder 1, but the yarn winding apparatus 10 may be mounted in an air spinning machine or an open-end spinning machine, for example.
[0026] (2-1) Winding Unit
As illustrated in Fig. 2, the winding unit 2 includes a yarn unwinding assist device 26, a tension applying device 27, a yarn splicing device 28, a clearer 29 (yarn quality measuring device), a waxing device 30, a cleaning pipe 31, and a package forming device 32 as main structural elements, which are disposed in order from the yarn feeding bobbin 20 to the take-up pipe 22.
[0027] The yarn unwinding assist device 26 restricts warping (balloon) of the unwound yarn 11, so as to stabilize unwinding tension. The yarn unwinding assist device 26 includes a movable cylinder 33 that covers the yarn feeding bobbin 20 from above. By allowing the movable cylinder 33 to move downward along with proceeding of unwinding of the yarn 11, warping (balloon) of the unwound yarn 11 is restricted, and unwinding tension is stabilized.
[0028] The tension applying device 27 applies predetermined tension to the traveling yarn 11. As the tension applying device 27, for example, it is possible to use a gate type, in which a movable comb tooth member 27b is disposed against a fixed comb tooth member 27a. The movable comb tooth member 27b is configured to be engaged or released from the fixed comb tooth member 27a. By allowing the yarn 11 to travel meandering between the comb tooth members in the engaged state, the yarn 11 to be wound is applied with a certain tension so that quality of the package 23 can be enhanced. Note that the tension applying device 27 is not limited to the gate type described above, but may be a disc type, for example.
[0029] If the clearer 29 detects a yarn defect and cuts the yarn, or if yarn breakage occurs during unwinding from the yarn feeding bobbin 20, the yarn splicing device 28 performs yarn splicing between the yarn 11 on the side of the yarn feeding bobbin 20 and the yarn 11 on the side of the package 23. The yarn splicing device 28 is a splicer device that twists the yarn ends together using swirling air flow generated by compressed air, for example.
[0030] The clearer 29 monitors a state of the yarn 11 traveling in the yarn travel path, so as to detect presence or absence of a yarn defect on the basis of the monitored information. The clearer 29 includes a clearer head 29a and an analyzer (not shown). The clearer head 29a is equipped with a sensor for detecting thickness of the yarn 11. The analyzer processes a yarn thickness signal from the sensor. The clearer 29 is configured to monitor the yarn thickness signal from the sensor so as to detect a yarn defect such as a slub. In a vicinity of the clearer head 29a, there is disposed a cutter 29b for promptly cutting the yarn 11 if the clearer 29 detects a yarn defect.
[0031] In the traveling direction of the yarn 11 when winding the yarn, a first catching unit 34 is disposed on the upstream side of the yarn splicing device 28, and a second catching unit 35 is disposed on the downstream side of the same. The first catching unit 34 catches the yarn 11 on the side of the yarn feeding bobbin 20 and guides the same to the yarn splicing device 28 when the yarn 11 is disconnected. The second catching unit 35 catches the yarn 11 on the side of the package 23 and guides the same to the yarn splicing device 28 when the yarn 11 is disconnected. The first catching unit 34 and the second catching unit 35 are configured to be capable of pivoting about shafts 34a and 35a, respectively. A distal end of the first catching unit 34 is provided with a suction inlet 34b, and a distal end of the second catching unit 35 is provided with a suction mouth 35b. The first catching unit 34 and the second catching unit 35 are each connected to a negative pressure source (not shown), and suction air flow is created at each of the suction inlet 34b and the suction mouth 35b, so that the yarn end can be sucked and caught.
[0032] The waxing device 30 is a device that applies appropriate wax to the traveling yarn 11.
[0033] The cleaning pipe 31 is a device that sucks and removes a foreign object adhered to the traveling yarn 11. A proximal end of the cleaning pipe 31 is connected to a blower via a shutter device (not shown), and a suction inlet is formed at a distal end of the cleaning pipe 31. The suction inlet of the cleaning pipe 31 is positioned adjacent to the traveling yarn 11 between the waxing device 30 and a winding drum 21.
[0034] The package forming device 32 includes a cradle 24, the take-up pipe 22, and the winding drum 21, as main structural elements.
[0035] The cradle 24 is configured to be capable of pivoting about a pivot shaft 25. The cradle 24 sandwiches the package 23 at both ends in the longitudinal direction, so as to support the package 23 in a rotatable manner about a predetermined axis.
The winding drum 21 is a cylindrical member driven by a first motor 21m to rotate about an axis. In the state where an outer periphery of the package 23 is contacted with the winding drum 21, the winding drum 21 is driven to rotate. Hence, the package 23 is given a drive force, so as to be driven to rotate along with rotation of the winding drum 21.
[0036] In addition, a side surface of the cylinder of the winding drum 21 is provided with a spiral traverse groove. During rotation of the winding drum 21, the package 23 is driven to rotate, and simultaneously the yarn 11 unwound from the yarn feeding bobbin 20 is traversed by the traverse groove, within a certain width on a surface of the package 23. In this way, the yarn 11 unwound and fed from the yarn feeding bobbin 20 is traversed and wound on the surface of the package 23. As a result, the package 23 having a certain winding width is formed.
[0037] (2-2) Control Unit
As illustrated in Fig. 1, the control unit 50 is disposed on a right side surface of the winding unit 2 to be controlled. However, the position of the control unit 50 in Fig. 1 is merely an example, and the position is not limited as long as it is near the winding unit 2 to be controlled.
[0038] Fig. 3 is a diagram of an inside of a case 60 constituting the control unit 50 viewed from a right side surface of the yarn winding apparatus 10. As illustrated in Fig. 3, the control unit 50 includes the case 60, a plate member 70, a circuit board 80 on which electronic components are mounted, and a power supply device (power supplying unit) 81 that supplies power to the circuit board 80, as main structural elements. In addition, the control unit 50 has a leg part 61 that abuts an underside of the case 60. The case 60 is attached to a top surface of the leg part 61, which supports the case 60.
[0039] (2-2-1) Case
As illustrated in Fig. 3, the case 60 encloses a space that houses the circuit board 80, the power supply device 81, and the plate member 70. In other words, the circuit board 80, the power supply device 81, and the plate member 70 are enclosed by the case 60 and housed in the case 60.
[0040] Fig. 4 is a perspective view illustrating an appearance of the case 60. When viewing from the front of the automatic winder 1, the case 60 is mainly constituted of a first surface 60a that is a left side surface, a second surface 60b that is a back side surface, a third surface 60c that is a front side surface, a fourth surface 60e that is an upper side surface, a fifth surface 60f that is an under side surface, and a sixth surface 60g that is a right side surface. The third surface 60c may have an inclined part 60d. The first surface 60a and the sixth surface 60g are surfaces having the largest area among constituting members of the case 60. In this embodiment, structural members of the first surface 60a, the second surface 60b, the third surface 60c, the fourth surface 60e, and the fifth surface 60f are made of resin. Thus, cost and weight of the yarn winding apparatus 10 can be reduced.
[0041] In this embodiment, a structural member of the sixth surface 60g is made of metal. The sixth surface 60g is made of metal such as iron, stainless steel (SUS), or aluminum. In this way, heat dissipation effect and static elimination effect from inside the case 60 can be enhanced via the sixth surface 60g. In addition, the sixth surface 60g is preferably painted on an inner surface and an outer surface of the case 60. By painting, thermal emissivity is enhanced, and hence heat dissipation effect from inside of the case 60 to the outside is improved.
[0042] (2-2-2) Plate Member
As illustrated in Fig. 3, the plate member 70 is disposed to be substantially parallel to the first surface 60a, at the right side of the first surface 60a (when viewing the automatic winder 1 from the front, at the back side). The plate member 70 is attached to the first surface 60a with screws, for example. Fig. 5 is a diagram of the plate member 70 viewed from the front (thickness direction). The plate member 70 is constituted of a single plate (a first plate part 71) elongated vertically, when viewing the first surface 60a from the longitudinal direction. The partially resin case 60 has lower strength than a whole metal case. Because the first plate part 71 has the above structure, strength of the case 60 is enhanced, and deformation thereof can be prevented.
[0043] The plate member 70 may further include a second plate part 72. In this embodiment, the second plate part 72 is the plate member 70 that extends from a long side of the first plate part 71 in a short side direction of the case 60. The second plate part 72 is attached to the first plate part 71 with screws 74, for example. In addition, the second plate part 72 has threaded holes 73 for grounding. Note that the threaded holes 73 for grounding may be provided to the first plate part 71.
[0044] Hereinafter, a combination of the first plate part 71 and the second plate part 72 is referred to as the plate member 70.
[0045] The plate member 70 includes a base material layer made of metal. The base material layer is made of metal such as iron, stainless steel (SUS), or aluminum. The material of the base material layer is not limited to those, but may be any material having electrical conductivity.
[0046] In addition, the plate member 70 has a radiation layer formed on an outer surface of the base material layer. Specifically, the plate member 70 has radiation layers on both sides of the base material layer, i.e., on a front side on which the power supply device 81 is attached and a back side that faces the first surface 60a. The radiation layer is made of a material having higher thermal emissivity than the base material layer. Specifically, the radiation layer is made by plating with electrical conductivity. In this embodiment, the radiation layer is made by electrogalvanizing, for example. Electrogalvanizing has a high electrical conductivity because the plating process is performed while supplying current. In addition, it has higher thermal emissivity than a polished surface of a metal material as the base material layer. The radiation layer is not limited to the electrogalvanizing, but may be made by black color chrome plating. Similarly to the electrogalvanizing, the black color chrome plating also has high electrical conductivity. In addition, when both sides of the plate member 70 have black color, thermal emissivity can be enhanced more. With the structure described above, heat of the plate member 70 can be dissipated to the case 60 by radiation.
[0047] (2-2-3) Control Section
The control section 55 is constituted of one or more circuit boards 80. The control section 55 is connected to the machine control device 12, so that control signals and information can be communicated between them. In addition, the control section 55 is communicably connected to sensors that detect a position and a state of the yarn 11, sensors for detecting states of devices of the winding unit 2, and switches, and the like. The control section 55 controls operations of the devices constituting the winding unit 2, on the basis of control signals from the machine control device 12. In this way, the control section 55 controls the winding operation by the winding unit 2.
[0048] The control section 55 is a computer system including a processor (such as a CPU), a storage device (such as a ROM, a RAM, a HDD, a SSD, and the like), and various interfaces (such as an A/D converter, a D/A converter, a communication interface, and the like). The control section 55 executes a program stored in a storage section (corresponding to a part or the whole of a storage region of the storage device), so as to perform various control operations.
[0049] The circuit board 80 on which electronic components such as the processor are mounted, which constitutes the control section 55, is attached to the first surface 60a of the case 60 with screws, for example. In addition, the circuit board 80 is attached to the plate member 70 by engaging screws 82 into the threaded hole 73 for grounding of the plate member 70. The circuit board 80 is connected for grounding to the plate member 70 via the screw 82. In this way, static electricity charged to the circuit board 80 can be eliminated.
[0050] The circuit board 80 on which high current of AV200V flows may be attached to the second plate part 72. In this case, a surface contact should be attained between an attached surface of the second plate part 72 and an attaching surface of the circuit board 80, for attachment. When surface contact is attained for attachment to the second plate part 72 having electrical conductivity, a stable connection to the ground can be always attained. In addition, heat generated by the circuit board 80 and the electronic components mounted on the circuit board 80 can be dissipated to the plate member 70 via an aluminum base of the circuit board 80.
[0051] The power supply device (power supplying unit) 81 such as a DC/DC converter for supplying power to the circuit board 80, and the power supply device 81 for supplying power to the first motor 21m that drives the winding drum 21 to rotate are attached to the first plate part 71 of the plate member 70 with screws, for example. In this case, a surface contact should be attained between the attached surface of the plate member 70 and the attaching surface of the power supply device 81, for attachment. Because high power current flows in the power supply device 81, a stable connection to the ground is always required. For this reason, the power supply device 81 has ground wiring, which is connected to a charge elimination appliance. Because the plate member 70 is attached to the power supply device 81 with a surface contact between them, a stable connection to the ground is always attained. In this way, the power supply devices 81 described above can eliminate static electricity charged to the power supply device 81, via the plate member 70. In addition, heat generated by the power supply device 81 can be dissipated to the plate member 70.
[0052] 2. Features of Embodiment
The first embodiment described above has the following structures and functions.
(1) The yarn winding apparatus 10 includes the winding unit 2, the circuit board 80, the power supply device 81, the plate member 70, and the case 60. The winding unit 2 performs winding operation of winding the yarn 11 so as to form the package 23. The circuit board 80 constitutes the control section 55 that controls the winding unit 2, and electronic components are mounted thereon. The power supply device 81 supplies power to the circuit board 80. The power supply device 81 is disposed on the plate member 70. Constituting members of the case 60 are at least partially made of resin. The case 60 encloses a space housing the circuit board 80, the power supply device 81, and the plate member 70. The plate member 70 includes a conductive base material layer and a radiation layer formed on an outer surface of the base material layer. The radiation layer has higher thermal emissivity than when the base material layer is exposed on the outer surface.
[0053] With the structure described above, heat generated by the electronic components mounted on the circuit board 80, the circuit board 80, and the power supply device 81 is dissipated to the plate member 70. Heat of the plate member 70 is dissipated to the case 60 by radiation, and then dissipated to the outside of the case 60. In this yarn winding apparatus 10, the radiation layer having high thermal emissivity is formed on the outer surface of the base material layer of the plate member 70, and hence heat dissipation effect for the circuit board 80 and the power supply device 81 can be enhanced.
[0054] (2) In the yarn winding apparatus 10 described above, the radiation layer may be made by plating. By plating on the outer surface of the base material layer, durability of the plate member 70 is improved.
[0055] (3) In the yarn winding apparatus 10 described above, the radiation layer may have electrical conductivity. When the outer surface of the base material layer has electrical conductivity, static elimination effect for the power supply device 81 can be enhanced.
[0056] (4) In the yarn winding apparatus 10 described above, the radiation layer may be made by electrogalvanizing. Because electrogalvanizing has high electrical conductivity, static elimination effect for the power supply device 81 can be enhanced more. In addition, because electrogalvanizing has high thermal emissivity, heat dissipation effect for the circuit board 80 and the power supply device 81 can be enhanced more.
[0057] (5) In the yarn winding apparatus 10 described above, the radiation layer may be made by black color chrome plating. Because black color chrome plating has high electrical conductivity, static elimination effect for the power supply device 81 can be enhanced more. In addition, because black color chrome plating has high thermal emissivity, heat dissipation effect for the circuit board 80 and the power supply device 81 can be enhanced more.
[0058] (6) In the yarn winding apparatus 10 described above, the circuit board 80 may be connected for grounding to the plate member 70. In this way, static elimination effect for the circuit board 80 can be obtained.
[0059] (7) In the yarn winding apparatus 10 described above, the plate member 70 may be a single plate elongated vertically, when the first surface 60a having the largest area among the constituting members of the case 60 is viewed from a longitudinal direction. In this way, strength of the case 60 can be reinforced.
[0060] (8) The automatic winder 1 includes a plurality of the yarn winding apparatuses 10 described above.
[0061] 3. Variations
(1) In this embodiment, the plate member 70 has the radiation layers made by electrogalvanizing on both sides of the base material layer, i.e., on the front side to which the power supply device 81 is attached and the back side facing the first surface 60a. However, the plate member 70 may have the electrogalvanizing radiation layer only on the front side. Because the power supply device 81 has to be connected to the ground, the front side is preferably made by plating with electrical conductivity. The back side thereof may be made of painting having high thermal emissivity. In this way, heat dissipation effect and static elimination effect can be enhanced.
[0062] (2) In this embodiment, the first plate part 71 is constituted of a single plate (the first plate part 71) elongated vertically, when viewing the first surface 60a from the longitudinal direction. However, the first plate part 71 may be constituted of a plurality of members.
[0063] 4. Other embodiments
Although embodiments of the present invention are described above, the present invention is not limited to the embodiments described above, but can be variously modified within the scope of the invention without deviating from the spirit thereof. In particular, the plurality of embodiments and variations described in this specification can be arbitrarily combined as necessary.

INDUSTRIAL APPLICABILITY
[0064] The yarn winding apparatus of the present disclosure can be applied to an automatic winder, an air spinning machine, or an open-end spinning machine, in which a plurality of yarn winding apparatuses are arranged and used. In addition, the yarn winding apparatus of the present disclosure can be widely applied to textile machinery for manufacturing fibers.

REFERENCE SIGNS LIST
[0065] 1 automatic winder
2 winding unit
10 yarn winding apparatus
11 yarn
12 machine control device
12a display
12b input interface
13 doffing device
20 yarn feeding bobbin
21 winding drum
21m first motor
22 take-up pipe
23 package
24 cradle
25 pivot shaft
26 yarn unwinding assist device
27 tension applying device
27a comb tooth member
27b comb tooth member
28 yarn splicing device
29 clearer
29a clearer head
29b cutter
30 waxing device
31 cleaning pipe
32 package forming device
33 movable cylinder
34 first catching unit
34a shaft
34b suction inlet
35 second catching unit
35a shaft
35b suction mouth
50 control unit
55 control section
60 case
60a first surface
60b second surface
60c third surface
60d inclined part
60e fourth surface
60f fifth surface
60g sixth surface
61 leg part
70 plate member
71 first plate part
72 second plate part
73 threaded hole
74 screw
80 circuit board
81 power supply device, power supplying unit
82 screw
, Claims:We claim:

1. A yarn winding apparatus (10) comprising:
a winding unit (2) configured to perform winding operation of winding yarn (11) so as to form a package (23);
a circuit board (80) constituting a control section (55) configured to control the winding operation, on which electronic components are mounted;
a power supplying unit (81) configured to supply power to the circuit board (80);
a plate member (70) on which the power supplying unit (81) is disposed; and
a case (60) whose constituting members are at least partially made of resin, the case enclosing a space housing the circuit board (80), the power supplying unit (81), and the plate member (70), wherein
the plate member (70) includes a conductive base material layer and a radiation layer formed on an outer surface of the base material layer, and
the radiation layer has higher thermal emissivity than when the base material layer is exposed on the outer surface.

2. The yarn winding apparatus (10) as claimed in claim 1, wherein the radiation layer is made by plating.

3. The yarn winding apparatus (10) as claimed in claim 1 or 2, wherein the radiation layer has electrical conductivity.

4. The yarn winding apparatus (10) as claimed in one of claims 1 to 3, wherein the radiation layer is made by electrogalvanizing.

5. The yarn winding apparatus (10) as claimed in one of claims 1 to 3, wherein the radiation layer is made by black color chrome plating.

6. The yarn winding apparatus (10) as claimed in one of claims 1 to 5, wherein the circuit board (80) is connected for grounding to the plate member (70).

7. The yarn winding apparatus (10) as claimed in one of claims 1 to 6, wherein the plate member (70) is a single plate elongated vertically, when a surface having the largest area among the constituting members of the case (60) is viewed from a longitudinal direction.

8. An automatic winder (1) comprising a plurality of the yarn winding apparatuses (10) as claimed in one of claims 1 to 7.