JP2005269802A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor that an operator can operate without being conscious of the heat of a radiation fin for the electric motor in the vicinity of an arrangement position of the electric motor. <P>SOLUTION: In the electric motor wherein a plurality of the radiation fins 18 are arranged in parallel to a motor housing 16, heat insulating members 21 are provided at tips of the radiation fins 18. The radiation fins 18 may be arranged at the motor housing 16, or the radiation fins 18 may be arranged at both sides of the motor housing 16 so that radiation faces 18a of the radiation fins 18 are almost vertical. The radiation fins 18 are formed of metal materials and the heat insulating members 21 may be formed of resin materials. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric motor, and more particularly to an electric motor provided with a plurality of heat radiation fins.

  In general, an electric motor driven by energization includes a motor housing that constitutes an outer shell of the electric motor. However, in order to regulate the temperature rise of the electric motor due to driving, a large number of heat dissipations are provided in the motor housing. A fin may be provided (for example, refer to Patent Document 1). By the way, although the electric motor is widely used in various devices, the electric motor is also used in the loom belonging to the textile machine.

For example, an electric motor is used in an ear forming device that forms an ear based on the operations of a first ear thread heel and a second ear thread heel that reciprocate in opposite directions (for example, Patent Documents). 2). In this ear forming apparatus, a two-dimensional crank mechanism is driven by an electric motor, and a pair of yarn guide elements are reciprocated linearly by the two-dimensional crank mechanism. The two-dimensional crank mechanism includes a lever attached to the output shaft of the electric motor and a pair of links connected to both ends of the lever. The pair of links are connected to the pair of thread guide elements on a one-to-one basis. .
Japanese Patent Laid-Open No. 10-23705 (page 4-5, FIG. 1) JP 10-503563 A (page 4-12, FIG. 1 to FIG. 2)

  Since conventional electric motors are equipped with heat radiating fins, heat generated in the electric motor by driving can be dissipated through the heat radiating fins to restrict an excessive temperature rise of the electric motor. May be relatively hot. When an operator performs work in the vicinity of such an electric motor, there is a problem that the operator must always work while being aware of the heat dissipating fins in a high temperature state. In particular, the electric motor included in the ear forming device or the like of the loom is provided at a position close to the worker's work position. For example, in the ear forming device, when the warp is cut during the operation of the loom, the operation of the loom is temporarily stopped and the warp is restored, but the worker who performs the restoration work approaches the electric motor. I must. It is possible to avoid contact between the electric motor in a high temperature state and the operator by providing a cover that covers the electric motor. In this case, however, the heat dissipation efficiency of the electric motor is deteriorated and the heat dissipation efficiency is increased. Another heat dissipating means such as a blower fan must be provided, resulting in a complicated structure and an increased manufacturing cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is in the vicinity of the electric motor in the vicinity of the position where the electric motor is disposed without the operator being aware of the heat of the heat radiation fins of the electric motor. It is in the provision of the electric motor which can work by.

  In order to achieve the above object, according to a first aspect of the present invention, in the electric motor in which a plurality of heat dissipating fins are arranged in parallel to the motor housing, a heat insulating member is provided at the tip of the heat dissipating fin. It is characterized by that. According to the first aspect of the present invention, the heat transfer from the tip of the heat dissipating fin is hindered by the heat insulating member.

  According to a second aspect of the present invention, in the electric motor according to the first aspect, the heat dissipating fins are arranged with respect to the motor housing such that the heat dissipating surfaces of the heat dissipating fins are substantially vertical surfaces. And According to the second aspect of the present invention, since the heat radiation surface of the heat radiation fin is a substantially vertical surface, dust is less likely to accumulate or adhere to the heat radiation surface, and the heat radiation effect of the heat radiation fin can be maintained. . Even if dust slightly adheres to the heat radiating surface, the heat radiating surface is a substantially vertical surface, so that it is easy to remove.

  According to a third aspect of the present invention, in the electric motor according to the first or second aspect, the heat dissipating fins are arranged on both sides of the motor housing. According to the invention described in claim 3, since the heat generated from the electric motor is dissipated to both sides by the heat dissipating fins disposed on both sides of the motor housing, the bias of the heat distribution is suppressed in the width direction of the electric motor. Is possible.

  According to a fourth aspect of the present invention, in the electric motor according to any one of the first to third aspects, a heat dissipating member having a plurality of the heat dissipating fins is formed, and the heat dissipating member is attached to the motor housing. It is characterized by being. According to the fourth aspect of the present invention, since the heat radiating member is provided with a plurality of heat radiating fins, the heat radiating fin is integrally attached to or detached from the motor housing by attaching or detaching the heat radiating member to the motor housing. Thus, workability such as maintenance work of the electric motor can be improved.

  According to a fifth aspect of the present invention, in the electric motor according to any one of the first to fourth aspects, the heat dissipating fin is formed of a metal material, and the heat insulating member is formed of a resin material. It is characterized by. According to the fifth aspect of the invention, it is relatively easy to set the thermal conductivity of the heat insulating member to be smaller than the thermal conductivity of the heat dissipating fin. In addition, since the resin-based material has a high degree of freedom in design, it is possible to form a heat insulating member that can be easily attached to the tip of the heat dissipating fin, and to reduce manufacturing costs.

  The invention according to claim 6 is the electric motor according to any one of claims 1 to 5, wherein the heat insulating member is provided with a hollow portion. According to invention of Claim 6, since the heat insulation member is equipped with the hollow part whose heat insulation property is higher than a heat insulation member, the heat insulation effect as a heat insulation member can further be improved.

  The invention according to claim 7 is the electric motor according to any one of claims 1 to 6, wherein the electric motor is provided in a textile machine. According to the seventh aspect of the present invention, even if the electric motor is disposed at a position close to the yarn path, it does not hinder the operator.

  According to an eighth aspect of the present invention, in the electric motor according to any one of the first to seventh aspects, the electric motor is included in an ear forming device provided in a loom. According to the invention described in claim 8, the operator who operates the warp or the like frequently approaches the electric motor included in the ear forming device, but it is necessary to always work while paying attention to the heat radiation fin provided in the electric motor. Disappears.

  A ninth aspect of the invention is the electric motor according to any one of the first to seventh aspects, wherein the electric motor is included in a weft path changing device provided in a loom. According to the ninth aspect of the present invention, the operator frequently approaches the electric motor included in the weft path changing device due to the operation of the weft, etc., but it is necessary to always be aware of the heat dissipating fins provided in the electric motor. Disappears.

  According to the present invention, in the vicinity of the position where the electric motor is disposed, the operator can perform work in the vicinity of the electric motor without being aware of the heat of the heat radiation fins of the electric motor.

(First embodiment)
Hereinafter, the electric motor according to the first embodiment will be described with reference to the drawings. The electric motor of this embodiment is an electric motor included in an ear forming device of a loom, and FIGS. 1 and 2 show an outline of the ear forming device. The ear forming device 10 includes a first ear thread ridge 11, a second ear thread ridge 12, a box 13 attached to a machine base of a loom, a wheel 22 in the box 13, and an electric motor. The stepping motor 14 is mainly composed of a first band 27 and a second band 28.

As shown in FIG. 1, the first ear thread ridge 11 and the second ear thread heel 12 included in the ear forming device 10 are moved up and down so as to be in opposite directions. The movement paths of the first ear thread ridge 11 and the second ear thread ridge 11 are parallel movement paths extending vertically.
The ear thread T1 passed through the first ear thread barb 11 and the ear thread T2 passed through the second ear thread barb 12 have an ear W sandwiching a weft thread (not shown) inserted. Form.

  Next, the box 13 will be described. As shown in FIGS. 1 and 2, the box 13 is disposed obliquely above the first ear thread ridge 11 and the second ear thread ridge 12. The upper and lower portions of the box 13 are open and have an inner wall 13a and an outer wall 13b that are parallel to each other and form a vertical surface. And as FIG. 1 shows, the side wall 13c which connects the inner wall 13a and the outer wall 13b is provided in the both sides of the box 13, respectively. A stepping motor 14 as an electric motor is mounted on the outer surface of the inner wall 13a of the box 13, and an output shaft 15 of the stepping motor 14 protrudes into the box 13 through the inner wall 13a. The protruding end of the output shaft 15 is rotatably supported by the outer wall 13b of the box 13.

Here, the stepping motor 14 will be described in detail with reference to FIG. The stepping motor 14 includes a motor housing 16 that constitutes an outer shell of the stepping motor 14.
In this embodiment, as shown in FIG. 3B, the motor housing 16 has a substantially square shape when viewed from the axial direction of the output shaft 15.

  A heat radiating member 17 having a plurality of heat radiating fins 18 is attached to the motor housing 16 so as to sandwich the motor housing 16 from both sides. The heat radiating members 17 on both sides are connected to each other via a connecting plate 19 at the top and bottom of the motor housing 16. In this embodiment, as shown in FIG. 3A, the heat radiating member 17 has five heat radiating fins 18 arranged in a row, and the heat radiating member 17 is installed on both sides of the motor housing 16. The heat dissipating fins 17 are parallel on both sides of the motor housing 16, and the heat dissipating surface 18a of the heat dissipating fins 18 is a substantially vertical surface.

  Therefore, in the heat radiating member 17, a vertical air vent groove 20 is formed by the adjacent heat dissipating fins 18, and this air vent groove 20 is set at an interval at which natural convection of air occurs due to heat dissipation of the heat dissipating fins 18. . In this embodiment, the heat radiating member 17 is made of an aluminum-based metal material having a relatively high thermal conductivity.

  A heat insulating member 21 is attached to the tip of the heat radiating fin 18 provided in the heat radiating member 17. The heat insulating member 21 is made of a heat-resistant resin material, and has a groove 21 a that is attached to the tip of the heat dissipating fin 18. The heat insulating member 21 can be mounted over the tip of the heat radiating fin 18 and has a length in the vertical direction that sufficiently exceeds the upper and lower sides of the heat radiating fin 18. Thereby, it is an element which prevents an operator from contacting the fin 18 for heat radiation of the stepping motor 14 from the up-down direction. An interval is provided between the adjacent heat insulating members 21, and the ventilation groove 20 is opened in the front-rear direction of the loom (the left-right direction in FIG. 3) by this interval.

  Here, as shown in FIG. 3A, a locking groove 18b is provided in the heat dissipating fin 18, and a locking projection 21b facing the groove 21a of the heat insulating member 21 is provided, and the locking groove 18b is engaged. The stop protrusion 21b is engaged. In addition, since the elastic force which the heat insulation member 21 has is utilized, when the latching protrusion 21b is latched to the latch groove 18b, the heat insulation member 21 does not easily fall off from the heat radiation fin 18, Also, the heat insulating member 21 can be attached to and detached from the heat radiating fin 18 relatively easily. A hollow portion 21c is formed between the tip of the heat radiation fin 18 and the innermost portion of the groove 21a. The hollow portion 21b helps to further prevent heat transfer from the heat dissipating fins 18 to the distal end side of the heat insulating member 21.

  Next, the wheel 22 in the box 13 will be described. In the box 13, a gear-like wheel 22 is fixed to the output shaft 15, and a plurality of power transmission teeth 22 a are provided on the outer periphery of the wheel 22. As shown in FIGS. 1 and 2, a first position restricting body 23 and a second position restricting body 24 are attached to the inner surface of the outer wall 13 b of the box 13. The first position restricting body 23 and the second position restricting body 24 face each other with the wheel 22 in between, and the first position restricting body 23 and the second position restricting body 24 have guide surfaces 23a and 24a, respectively. Is provided.

  A mounting body 25 is fixed to the inner surface of the outer wall 13b of the box 13. The attachment body 25 is disposed between the first position restriction body 23 and the second position restriction body 24. The attachment body 25 is separated from the guide surface 23a of the first position restricting body 23 and the guide surface 24a of the second position restricting body 24, respectively. The guide surfaces 23a and 24a face each other with the attachment body 25 and the wheel 22 sandwiched so as to expand upward.

  A guide rail 26 is fixed to the mounting body 25 in a suspended state. The guide rail 26 is formed with a pair of guide grooves 26a, 26b back to back, and the guide grooves 26a, 26b are parallel to the reciprocating path between the first ear thread ridge 11 and the second ear thread ridge 12. Adjacent to extend in the direction. The guide groove 26a is exposed toward the front (right side in FIG. 1) of the loom, and the guide groove 26b is exposed at the rear (left side in FIG. 1) of the loom.

  Next, the first band 27 and the second band 28 will be described. The first band 27 and the second band 28 are fiber reinforced resin materials reinforced with carbon fibers. A part of the first band 27 that can be bent and deformed is slidably inserted into the guide groove 26a, and a part of the same second band 28 is slidably inserted into the guide groove 26b. ing.

  The first band 27 is bent and deformed between the attachment body 25 and the guide surface 23a of the first position restricting body 23, and between the wheel 22 and the guide surface 23a of the first position restricting body 23. It extends upward through. The second band 28 is bent and deformed between the mounting body 25 and the guide surface 24a of the second position restricting body 24, and between the wheel 22 and the guide surface 24a of the second position restricting body 24. It extends upward through.

  A plurality of power receiving holes 27 a and 28 a are arranged in the first band 27 and the second band 28. Power transmission teeth 22a of the wheel 22 are meshed with the power receiving holes 27a and 28a. That is, the first band 27 and the second band 28 are opposed to each other with the wheel 22 sandwiched in a state of being bent and deformed so as to mesh the power receiving holes 27a, 28a and the power transmission teeth 22a.

  A pair of latching arms 29 and 30 are fixed to the first band 23, and a pair of latching arms 31 and 32 are fixed to the second band 24. The pair of latch arms 29 and 30 is supported by the first ear thread ridge 11, and the pair of latch arms 31 and 32 is supported by the second ear thread ridge 12. Yes. That is, the first band 27 supports the first ear thread ridge 11, and the second flexible band 28 supports the second ear thread ridge 12.

  Next, the operation of the ear forming device 10 according to this embodiment will be described. When the stepping motor 14 is energized, the output shaft 15 reciprocates and the wheel 22 reciprocates as the output shaft 15 reciprocates. The reciprocating rotation of the wheel 22 is transmitted to the first band 27 and the second band 28 through meshing between the power transmission teeth 22a and the power receiving holes 27a. As a result, the first band 27 and the second band 28 move up and down in the guide grooves 26a and 26b in opposite directions. The first band 27 reciprocates in sliding contact with the guide surface 23a. That is, the first position restricting body 23 is in contact with the first band 27 so as to restrict the meshing position of the first band and the 27 wheel 22, and the second position restricting body 24 is connected to the second band 28. The second band 28 is contacted so as to restrict the meshing position with the wheel 22.

  When the first band 27 and the second band 28 move up and down in the guide grooves 26a and 26b in the opposite directions, the first ear thread fold 11 and the second ear thread fold 12 move up and down in the opposite directions. To do. Thus, the ear thread T1 passed through the first ear thread ridge 11. The ear W is formed by sandwiching the weft thread in which the ear thread T2 passed through the second ear thread bag is inserted.

  When the ear W is formed by the operation of the ear forming device 10, the output shaft 15 of the stepping motor 14 reciprocates at high speed, so that the stepping motor 14 generates heat and the temperature of the stepping motor 14 rises. In particular, when the stepping motor 14 is reciprocated at high speed, the iron loss promotes heat generation. In this embodiment, since the output shaft 15 reciprocates at high speed, the temperature of the stepping motor 14 rises remarkably.

  The heat radiating member 17 provided in the stepping motor 14 absorbs the heat of the motor housing 16, and the heat of the stepping motor 14 is radiated through the heat radiating surface 18 a of the heat radiating fin 18. On the other hand, since the heat insulating member 21 is provided in the vicinity of the front end portion of the heat dissipating fin 18, the heat of the heat dissipating fin 18 is hardly transmitted to the surface of the heat insulating member 21.

  In this embodiment, the heat insulating member 21 is attached to the tip of each heat radiating fin 18, but it is not always necessary to provide the heat insulating member 21 on all the heat radiating fins 18, and at least some of the heat radiating fins 18 are provided. What is necessary is just to attach the heat insulation member 21 to the front-end | tip part. For example, as shown in FIG. 4A, the heat dissipating fins 18 to which the heat insulating members 21 are attached and the heat dissipating fins 18 to which the heat insulating members 21 are not attached may be alternated. In this case, since the number of the heat insulating members 21 attached to the radiation fins 18 can be reduced, the manufacturing cost can be reduced. As another mounting example, the heat insulating member 21 may be mounted on each of the two heat dissipating fins 18 located outside as shown in FIG.

According to this embodiment, the following effects can be obtained.
(1) Heat transfer from the tip of the heat dissipating fin 18 is prevented by the heat insulating member 21. For this reason, the worker can work without being aware that the stepping motor 14 is at a high temperature. In particular, the ear forming device in the loom as in the present embodiment is provided adjacent to the path of the warps T1 and T2, and the path of the warps T1 and T2 is frequently operated by an operator due to problems such as warp breakage. Since it is a place to perform, it is possible to work without being conscious of the heat of the heat dissipating fins 18 of the stepping motor 14 provided at a position close thereto, thereby improving the work efficiency of the worker.
(2) Since the heat dissipating surface 18a of the heat dissipating fin 18 is a substantially vertical surface, dust is less likely to accumulate or adhere to the heat dissipating surface 18a, and the heat dissipating effect of the heat dissipating fin 18 can be maintained. It should be noted that even if dust slightly adheres to the heat radiating surface 18a, the heat radiating surface 18a is almost a vertical surface and can be easily removed. In particular, the fluff that tends to occur in a textile machine is easy to remove even if it accumulates on the stepping motor 14, and the stepping motor 14 does not require complicated fluff removal work.

(3) The generated heat is dissipated to both sides of the stepping motor 14 through the heat dissipating fins 18 by the heat dissipating members 17 disposed symmetrically on both sides of the motor housing 16, so that the heat distribution in the width direction of the stepping motor 14 It is possible to suppress the bias.
(4) Since the heat radiating member 17 is provided with a plurality of heat radiating fins 18, the plurality of heat radiating fins 18 are integrally mounted or removed by mounting or removing the heat radiating member 17 with respect to the motor housing 16. Become. For this reason, workability | operativity, such as replacement | exchange work of the stepping motor 14, a maintenance work, can be improved.

(5) Since the heat insulating member 21 is made of a heat-resistant resin material, it is relatively easy to set the heat conductivity of the heat insulating member 21 to be smaller than the heat conductivity of the heat radiating member 17. In addition, since the resin-based material has a high degree of freedom in design, it is possible to form the heat insulating member 21 that can be easily attached to the tip portion of the heat dissipating fin 18 and to reduce the manufacturing cost.
(6) The tip of the heat radiating fin 18 is inserted into the groove 21 a of the heat insulating member 21, and the protrusion 21 b of the heat insulating member 21 is locked to the locking groove 18 a of the heat radiating fin 18. Since the heat insulating member 21 is attached to the heat dissipating fin 18 by using the heat insulating member 21, the heat insulating member 21 can be easily attached to and detached from the heat dissipating fin 18.

(Second Embodiment)
Next, an electric motor according to a second embodiment will be described. As shown in FIG. 5, the electric motor of the second embodiment is a stepping motor 44 provided in a weft path changing device 40 that changes a weft path in a loom.

  First, the outline of the weft path changing device 40 will be described. As shown in FIG. 5, the weft path changing device 40 is disposed between the winding type weft length measuring storage device 55 and the main nozzle 58 for weft insertion. The The weft length measuring and storing device 55 is used for winding and storing the weft Y, and a thread winding surface 55a around which the weft Y is wound and a locking pin for locking or releasing the weft Y that is wound and stored. 56 and a photoelectric sensor 57 for detecting the weft Y drawn and unwound from the thread winding surface 55a.

  The weft path changing device 40 is located downstream of the weft storage device 55. This weft path changing device includes a support frame 41. The support frame 41 includes a flat plate-like substrate portion 41a and an upstream guide plate portion attached to an end portion of the substrate portion 41a on the weft length measuring storage device 55 side. 41b and a downstream guide plate portion 41c integrally formed at the end of the substrate portion 41a on the weft insertion main nozzle 58 side. A ring-shaped upstream yarn guide 42 is fixed to the upstream guide plate portion 41b, and a downstream yarn guide 43 is fixed to the downstream guide plate portion 41c. The threading hole 42a of the upstream thread guide 42 and the threading hole 43a of the downstream thread guide 43 are substantially concentric.

  On the other hand, a stepping motor 44 as an electric motor is attached to the back surface of the substrate portion 41a. The stepping motor 44 is reciprocally rotated under the control of a control device (not shown). The output shaft 45 of the stepping motor 44 protrudes through the base plate portion 41 a to the front side, and the yarn path changing body 51 is fixed to the protruding portion of the output shaft 45. The rotation axis of the output shaft 45 is perpendicular to the substrate portion 41a.

  The stepping motor 44 includes a motor housing 46 that forms an outer shell. The stepping motor 44 has a rectangular shape when viewed from the axial direction of the output shaft 45, and the stepping motor 44 has a planar side surface. . A heat radiating member 47 having a plurality of heat radiating fins 48 is mounted so as to cover the side surface of the stepping motor 44.

  The heat dissipating member 47 is made of an aluminum-based metal material, and includes a case member 49 having a rectangular tube shape that covers the motor housing 46 and heat dissipating fins 48 that are formed at right angles on the two side surfaces 49a and 49b of the case member 49. ing. Each heat dissipating fin 48 includes an inverted L-shaped vertical heat dissipating surface 48 a protruding from the upper surface and one side surface 49 a of the case body 49, and these heat dissipating fins 48 are arranged in the axial direction of the output shaft 45. Has been.

  And the heat insulation member 50 which goes to the orthogonal | vertical direction is mounted | worn with the front-end | tip part of the side of each fin 48 for heat radiation. The heat insulating member 50 is made of a heat-resistant resin material, and has a groove 50 a that is attached to the tip of the heat radiation fin 48. Therefore, when the heat radiating member 47 is mounted on the motor housing 46, the plurality of heat radiating fins 48 are arranged in parallel to the motor housing 46.

  The yarn path changing body 51 fixed to the projecting portion of the output shaft 15 is provided with a linear thread passage 52 extending therethrough, and an upstream guide ring 53 is fitted into the upstream opening of the yarn passage 52. A downstream guide ring 54 is fitted into and fixed to the downstream opening of the yarn passage 52.

  The threading holes 53 a and 54 a of both guide rings 53 and 54 overlap the thread passage 52 when viewed in the direction of the thread passage 52. The yarn path changing body 51 rotates integrally with the output shaft 45 as the stepping motor 44 operates. The weft Y is passed through the upstream yarn guide 42, the upstream guide ring 53, the yarn passage 52, the downstream guide ring 54, and the downstream yarn guide 43.

  Next, the operation of the yarn path changing device 40 according to the second embodiment will be described. In response to a command from the control device, the locking pin 56 in the weft length measuring storage device 55 is detached from the thread winding surface 55a at a predetermined timing, and the weft Y is released from the locking pin 56. At this time, the weft Y is ejected from the weft insertion main nozzle 58 by the fluid injection of the weft insertion main nozzle 58.

  Next, when the weft insertion of the weft Y is near the end, the control device controls the operation of the stepping motor 44 so as to rotate the yarn path changing body 51 from the weft insertion position to the weft braking position. When the yarn path changing body 50 is in the weft braking position, although not shown, the weft Y is in contact with the upstream yarn guide 42, the downstream yarn guide 43, the upstream guide ring 53, and the downstream guide ring 54, while on the upstream side. A yarn path at the time of braking in which the yarn guide 42 and the downstream yarn guide 43 are bent is taken. When the yarn path changing body 51 is located at the weft insertion position, as shown in FIG. 6, the weft Y is substantially linear between the upstream yarn guide 42 and the weft insertion main nozzle 58 and is upstream. It can be said that the weft insertion resistance of the weft Y is small because the side guide ring 53 and the downstream guide ring 54 are not in contact with each other.

  On the other hand, when the yarn path changing body 51 is located at the weft braking position, the yarn path changing body 51 is in an inclined state, and the weft Y has the upstream yarn guide 42, the downstream yarn guide 43, and the upstream guide ring 53. In addition, it is in contact with the downstream guide ring 54 and is in a bent state, and a resistance for applying a braking action to the weft Y during weft insertion occurs. Further, when the yarn path changing body 51 is inclined, the load on the stepping motor 44 increases because the yarn path changing body 51 receives the tension from the weft Y. Thus, an increase in the load of the stepping motor 44 near the end of the weft insertion reduces the weft insertion speed of the weft Y, and a rapid increase in tension at the end of the weft Y insertion is suppressed. Further, when the weft Y is pulled back, the yarn path changing body 50 is further inclined, so that the load on the stepping motor 44 is further increased.

  By the way, the energization of the stepping motor 44 generates heat in the stepping motor 44, and the amount of heat generation increases as the load on the stepping motor 44 increases. The generated heat causes the temperature of the stepping motor 44 to rise, but is radiated through the heat radiation fins 48 of the heat radiation member 47 attached to the stepping motor 44. When a problem such as weft breakage occurs in the loom, a new work of passing the weft Y through the weft path must be performed. Done in However, since the heat insulating member 50 at the front end portion of the heat radiating fin 48 is difficult to receive heat from the heat radiating fin 48, the worker works without being aware of the heat of the heat radiating fin 48 during the weft passing operation. be able to. According to this 2nd Embodiment, there exists an effect similar to the stepping motor 14 of previous embodiment.

The present invention is not limited to the first and second embodiments described above, and various modifications are possible within the scope of the gist of the invention. For example, the following modifications may be made.
In the first and second embodiments described above, the stepping motor as an electric motor included in the ear forming device or the weft path changing device has been described. However, the type and type of the electric motor to which the present invention is applied are fundamental. For example, the present invention can be applied to a servo motor or the like. Further, it is suitable for an electric motor that can reciprocate and requires high-speed rotation and tends to generate heat, and is particularly suitable for an electric motor provided at a position where the possibility of contact with an operator is recognized.
In the first and second embodiments described above, the electric motor included in the loom ear-forming device or the weft path changing device has been described, but it can be applied to an electric motor used in other than both loom devices, For example, the present invention may be applied to an electric motor that can be touched by an operator, such as an electric motor that replaces a stretch nozzle for obtaining the tension of a weft thread inserted, or an electric motor for driving an ear cutter. Furthermore, the present invention is not limited to a loom but can be applied to a textile machine such as a ring spinning machine, a ring twisting machine, and a multiple twisting machine.

In the first and second embodiments described above, the tip of the heat dissipating fin is fitted into the groove of the heat insulating member so that the heat insulating member is mounted using the elasticity of the heat insulating member. The means for attaching the heat insulating member to the heat radiating fin, such as attachment or attachment using an adhesive, can be selected as appropriate.
○ In the first and second embodiments described above, the heat radiating surface of the heat radiating fin is arranged in the motor housing so as to be in a substantially right angle direction. In addition, the number, shape, and size of the heat dissipating fins are appropriately set according to various conditions such as an electric motor. For example, the heat dissipation member 60 shown in FIG. 8 may be used. In the heat radiating member 60, the heat radiating fins 62 projecting on both sides of the case body 61 are formed in a columnar shape, and a large number of the heat radiating fins 62 are arranged in parallel on the side surface of the case body 61. A heat insulating member 63 is provided at the tip of 62. The heat radiating member 64 can be attached to the stepping motor 64.

In the first and second embodiments described above, the heat insulating member is a heat-resistant resin material, but any heat-resistant material having a small heat transfer coefficient may be used. For example, a rubber-based material, a ceramic-based material, or The use of wood-based materials is also planned.
In the first and second embodiments described above, a plurality of heat insulating members are respectively attached to the heat dissipation fins. For example, as shown in FIG. 9, a plurality of heat insulating members 65a are connected. The composite heat insulating member 65 may be used. In the composite heat insulating member 65, the connecting portion 65 b that connects the individual heat insulating members 65 a covers the tip end portions of the heat radiation fins 68. Further, since the composite heat insulating member 65 in which the heat insulating member 65a is integrated is fixed via the heat radiation fins 68 at both ends, the handling as the heat insulating member 65a becomes easy. 9 includes heat radiating fins 68 arranged on both sides of the case body 67, and the heat radiating surfaces 65a of the heat radiating fins 68 are substantially vertical.
In the first and second embodiments described above, the heat radiating member provided with a plurality of heat radiating fins is attached to the motor housing. However, the heat radiating fins may be arranged directly on the motor housing. Moreover, you may integrally form a radiation fin and a motor housing.
○ The shape of the heat insulating member is not limited to a shape that covers only the tip, but for example, the upper and lower sides of the U-shaped heat insulating member are fitted and attached to the upper and lower surfaces of the radiating fin, and the vertical side and the radiating fin tip A hollow portion may be formed between the upper portion and the lower portion so as to cover the upper surface and the lower surface in addition to the tip portion of the heat radiating fin. Even in this case, since most of the heat radiating surface of the heat radiating fin is still exposed, the adverse effect on the heat radiating function is small.

It is the side view and the sectional view of the AA line which showed the ear formation device concerning a 1st embodiment partially fractured. It is the front view which fractured and showed the ear formation device concerning a 1st embodiment. It is the top view of the electric motor which concerns on 1st Embodiment, and the side view seen from the inner wall outer side of a box. It is an enlarged plan view which shows the example of attachment of the heat insulation member to the fin for heat radiation. It is the top view which partially fractured and showed the weft path changing apparatus which concerns on 2nd Embodiment. FIG. 5 is a side view illustrating a partially broken weft path changing device according to a second embodiment. It is a perspective view which shows the electric motor and heat radiating member which concern on 2nd Embodiment. It is an expansion perspective view which shows another form of the fin for thermal radiation. It is a perspective view which shows the composite heat radiating member with which the several heat insulation member was integrated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ear forming apparatus 11 1st ear thread hook 12 2nd ear thread hook 14, 44, 64 Stepping motor 16, 46 Motor housing 17, 47, 60, 66 Heat radiation member 18, 48, 62, 68 For heat radiation Fin 20 Ventilation grooves 21, 50, 63, 65a Heat insulation member 40 Weft path changing device 51 Yarn path changing body 55 Weft length measuring storage device 58 Main nozzle 65 for weft insertion Composite heat insulating member T1 First ear thread T2 Second ear Thread Y Weft W Ear

Claims (9)

An electric motor in which a plurality of heat dissipating fins are arranged in parallel to a motor housing, wherein a heat insulating member is provided at a tip portion of the heat dissipating fin. The electric motor according to claim 1, wherein the heat dissipating fin is disposed with respect to the motor housing such that a heat dissipating surface of the heat dissipating fin is a substantially vertical surface. 3. The electric motor according to claim 1, wherein the heat dissipating fins are disposed on both sides of the motor housing. The electric motor according to claim 1, wherein a heat radiating member including a plurality of the heat radiating fins is formed, and the heat radiating member is attached to the motor housing. 5. The electric motor according to claim 1, wherein the heat dissipating fin is made of a metal material and the heat insulating member is made of a resin material. The electric motor according to claim 1, wherein the heat insulating member is provided with a hollow portion. The electric motor according to any one of claims 1 to 6, wherein the electric motor is provided in a textile machine. The electric motor according to any one of claims 1 to 7, wherein the electric motor is included in an ear forming device included in a loom. The electric motor according to any one of claims 1 to 7, wherein the electric motor is included in a weft path changing device provided in a loom.

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