JP2006322092A - Selvage-forming device of weaving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make no difference between a proceeding of abrasion on the wall surface of a power receiving hole of one band and a proceeding of abrasion on the wall surface of a power receiving hole of the other band. <P>SOLUTION: In the selvage-forming device of a weaving machine, power receiving holes 231, 241 of a first band 23 and a second band 24 are geared to a power transmission gear 181 of a wheel 18 reciprocally rotated by electric motor 17. An angle between a first tangential line L1 on the side of the first band 23 and a second tangential line L2 on the side of the second band 24 is α. A pitch of the power receiving hole 231 of the first band 23 is P which is equal to a pitch of the power receiving hole 241 of the second band 24. Relations expressed by α/2=2π/Z and P=2π×R/Z are established, wherein Z expresses number of teeth (number of teeth of power transmission gear 181) of the wheel 18 and R expresses the radius of the wheel 18. In addition, relation expressed by α/2=n×θ is established, wherein θ expresses a minimum action angle of the electric motor 17 and n expresses a positive integer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ear forming device in a loom that forms an ear based on the operations of a first ear thread kite and a second ear thread kite that reciprocate in opposite directions.

For example, Patent Documents 1 and 2 disclose an ear forming device that forms an ear based on the operations of a first ear thread scissors and a second ear thread scissors that reciprocate in opposite directions.
In the ear forming device disclosed in Patent Document 1, a two-dimensional crank mechanism is driven by an electric motor, and a pair of yarn guide elements are reciprocated linearly by driving 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.

  The larger the opening amount of the ear thread, the easier the weft insertion of the weft thread. In order to increase the maximum opening amount of the ear thread in the device disclosed in Patent Document 1, it is necessary to increase the rotation radius of the lever (that is, the distance from the rotation center axis of the lever to the connection position between the lever and the link). . Increasing the rotation radius of the lever increases the torque required to rotate the lever and increases the load on the electric motor. This makes it difficult to operate the electric motor at a high speed and hinders the speeding up of the loom.

In the ear forming device disclosed in Patent Document 2, the first band that supports the first ear thread ridge and the second band that supports the second ear thread ridge have their power receiving holes and wheels. The wheels are opposed to each other so as to mesh with the power transmission teeth. By reciprocating the wheel, the first band and the second band move in the opposite directions, and the first ear thread heel and the second ear thread heel move up and down in the opposite directions. . The maximum ear thread opening amount can be increased by increasing the one-way rotation amount of the wheel that is reciprocally rotated. The torque required to rotate the wheel can be reduced by reducing the wheel radius, and the flexibly deformable band that meshes with the wheel can be reduced in thickness and weight. . Therefore, the electric motor can be operated at high speed.
Japanese National Patent Publication No. 10-503563 JP 2004-308064 A

  In the ear forming device disclosed in Patent Document 2, the engagement state between the power receiving hole of one band and the power transmission teeth of the wheel, and the engagement state of the power reception hole of the other band and the power transmission teeth of the wheel If the band acceleration is not the same (when the rotation direction of the wheel changes), the load applied to the wall of the power receiving hole of one band and the wall of the power receiving hole of the other band There is a difference in load. For this reason, the wall surface of the power receiving hole of the band receiving a large load wears faster than the wall surface of the power receiving hole of the band receiving a small load.

  An object of the present invention is to eliminate the difference between the progress of wear on the wall surface of the power receiving hole of one band and the progress of wear on the wall surface of the power receiving hole of the other band.

  To this end, the present invention is directed to an ear forming device that forms an ear based on the operations of the first and second ear thread ridges that reciprocate in opposite directions. The ear forming device includes a first deformable first band in which a plurality of power receiving holes are arranged, a second deformable band in which a plurality of power receiving holes are arranged, and the first band. And a wheel having a plurality of power transmission teeth meshing with the power receiving holes of the band and the second band, respectively, the first band supports the first ear thread ridge, and the second band The band supported the second ear thread ridge, and the first band and the second band were bent and deformed so as to mesh the respective power receiving holes and the power transmission teeth. Are opposed to each other with the wheel interposed therebetween, and meshed with the power receiving hole of the first band. The first tangent at the intersection of the radial line of the wheel passing through the center in the circumferential direction of the power transmission tooth and the root circle, and the circumferential direction of the power transmission tooth meshed with the power receiving hole of the second band The angle formed by the radius line of the wheel passing through the center and the second tangent at the intersection of the root circle is α, the number of teeth of the wheel is Z, the radius of the wheel is R, the first band and the second band The relationship of α / 2 = m × 2π / Z and P = 2π × R / Z is set, where P is the pitch of the power receiving hole with the band, and m is a positive integer or a positive half integer. It is characterized by. In the present invention, the term “meshing” refers to a state in which the power transmission teeth of the wheel are in contact with the power receiving holes of the first and second bands, and the power is transmitted between them.

  Such a relationship makes the load applied to the wall surface of the power receiving hole of the first band the same as the load applied to the wall surface of the power receiving hole of the second band, and the power receiving hole of the first band. The difference between the progress of wear on the wall surface and the progress of wear on the wall surface of the power receiving hole of the second band is eliminated.

  In a preferred example, the wheel is driven by an electric motor that stops at a rotation position with a minimum operation angle interval, and the minimum rotation angle of the wheel corresponding to the minimum operation angle of the electric motor is set to θ, n. Assuming that the integer is α, a relationship of α / 2 = n × θ is set.

  If the relationship of α / 2 = n × θ is set, the power receiving holes of the first and second bands and the wheel when the wheel rotation direction is switched (when the electric motor rotation direction is switched). It can be set as the state which meshed | engaged with the power transmission tooth completely.

In a preferred example, the power receiving hole in the straight portion of the first band and the power receiving hole in the straight portion of the second band mesh with the power transmission teeth of the wheel.
The portion of the linear state of the first band and the second band is in contact with the wheel. The configuration in which the linear portions of the first band and the second band are in contact with the wheel is advantageous in facilitating the reciprocating movement of the band.

In a preferred example, m is 1/2, 1 or 3/2.
The configuration in which m = 1/2, 1 or 3/2 is advantageous in terms of suppressing the magnitude of the angle α and facilitating the reciprocating movement of the band.

  In a preferred example, a guide means for guiding the first band and the second band is provided, and the guide means has a first position as the distance from the engagement position between the power transmission teeth and the power receiving holes increases. The band and the second band are brought close to each other, and then a part of the first band and a part of the second band are made adjacent to each other in parallel.

  Such a guiding means is suitable for connecting a band that can be bent and deformed to the first and second ear thread ridges in parallel.

  The present invention has an excellent effect of eliminating the difference between the progress of wear on the wall surface of the power receiving hole of one band and the progress of wear on the wall surface of the power receiving hole of the other band.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in an ear forming opening device will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, the first ear thread ridge 11 and the second ear thread heel 12 are moved up and down in opposite directions by the reciprocating drive mechanism 13. The movement path of the first ear thread ridge 11 and the second ear thread ridge 12 is a reciprocating path that extends in the vertical direction and is parallel to each other. The ear thread 14 passed through the first ear thread ridge 11 and the ear thread 15 passed through the second ear thread heel 12 are arranged so that the ear We is sandwiched between the weft threads (not shown). Form.

  As shown in FIGS. 3A and 3B, an electric motor 17 is mounted on the inner wall 161 of the box 16 constituting the reciprocating drive mechanism 13. The electric motor 17 is a stepping motor or a servo motor. The upper and lower portions of the box 16 are open. An output shaft 171 of the electric motor 17 protrudes into the box 16 through the inner wall 161. The axial direction of the output shaft 171 substantially coincides with the weft insertion direction of the weft yarn. The protruding end portion of the output shaft 171 is rotatably supported by the outer wall 162 of the box 16. In the box 16, a wheel 18 is fixed to the output shaft 171. A plurality of power transmission teeth 181 are provided on the outer periphery of the wheel 18.

  As shown in FIGS. 1 and 2A, a metal first position restricting body 19 and a metal second position restricting body 20 are fixed to the inner surface of the outer wall 162 of the box 16. The first position restricting body 19 and the second position restricting body 20 are opposed to each other with the wheel 18 interposed therebetween. A mounting body 21 is fixed to the inner surface of the outer wall 162 of the box 16. The attachment body 21 is disposed between the first position restriction body 19 and the second position restriction body 20. The attachment body 21 is separated from the opposing surfaces 191 and 201 of the first position restriction body 19 and the second position restriction body 20.

  The opposing surfaces 191, 201 include guide curved surfaces 193, 203 that are convex toward the wheel 18 side, and guide planes 194, 204 that are smoothly connected to the guide curved surfaces 193, 203. The opposing surfaces 191 and 201 are convex toward the wheel 18 and are opposed to each other. The guide planes 194 and 204 face each other with the wheel 18 sandwiched so as to expand upward, and the guide curved surfaces 193 and 203 face each other with the attachment body 21 sandwiched so as to expand upward. ing. The guide planes 194, 204 make an angle α. In the present embodiment, the guide curved surfaces 193 and 203 are circular curved surfaces.

  A metal guide rail 22 is fixed to the attachment body 21 in a suspended state. As shown in FIG. 2B, the guide rail 22 has a pair of guide grooves 221 and 222 formed back to back. The guide grooves 221 and 222 are adjacent to each other so as to extend in a direction parallel to the reciprocating path between the first ear thread ridge 11 and the second ear thread ridge 12. The guide groove 221 is exposed on the front side of the loom (the right side is the front side of the loom and the left side is the rear side of the loom in FIGS. 1 and 2A), and the guide groove 222 is exposed on the rear side of the loom. Yes.

  A part of the first band 23 that can be bent and deformed is slidably inserted into the guide groove 221, and a part of the second band 24 that can be bent and deformed is slidably inserted into the guide groove 222. Has been. That is, the portion of the first band 23 and the portion of the second band 24 in the guide grooves 221 and 222 are parallel to the reciprocating path between the first ear thread ridge 11 and the second ear thread heel 12. Adjacent to reciprocate. The first band 23 and the second band 24 are made of fiber reinforced plastic reinforced with carbon fiber.

  The first band 23 extends upward through a gap between the attachment body 21 and the opposing surface 191 of the first position restricting body 19 in a state of being bent and deformed. The second band 24 extends upward through a gap between the attachment body 21 and the opposing surface 201 of the second position restricting body 20 in a deformed state. Further, the first band 23 extends upward through the space between the wheel 18 and the opposed surface 191 of the first position restricting body 19, and the second band 24 is formed between the wheel 18 and the second position restricting body 19. It extends upward through the space 20 facing the body 20.

  A plurality of power receiving holes 231 and 241 are arranged in the first band 23 and the second band 24. Power transmission teeth 181 are engaged with the power receiving holes 231 and 241. That is, the first band 23 and the second band 24 are bent and deformed so that the power receiving holes 231 and 241 and the power transmission teeth 181 of the first band 23 and the second band 24 are engaged with each other. In this state, the wheels 18 are opposed to each other. The portion of the first band 23 that faces the guide plane 194 of the first position regulating body 19 is in a straight line state, and the second band 24 that faces the guide plane 204 of the second position regulating body 20. The part is in a straight line state. The power transmission teeth 181 of the wheel 18 mesh with the power receiving hole 231 in the linear portion of the first band 23 facing the guide plane 194. Further, the power transmission teeth 181 of the wheel 18 mesh with the power receiving hole 241 in the linear portion of the second band 24 facing the guide plane 204. The linear state portion of the first band 23 facing the guide plane 194 is in contact with the tooth bottom 180 of the wheel 18 and the linear state of the second band 24 facing the guide plane 204 as shown in FIG. This portion is in contact with the tooth bottom 180 of the wheel 18.

  A clearance groove 192 is formed in the opposing surface 191 (guide plane 194) of the first position restricting body 19 at the meshing position between the power receiving hole 231 of the first band 23 and the power transmission teeth 181. A clearance groove 202 is formed on the opposing surface 201 (guide plane 204) of the second position restricting body 20 at the meshing position of the power receiving hole 241 of the second band 24 and the power transmission teeth 181. The power transmission tooth 181 meshing with the power receiving hole 231 of the first band 23 enters the escape groove 192 and the power transmission tooth meshing with the power receiving hole 241 of the second band 24. 181 enters the escape groove 202. Accordingly, the first position restricting body 19 and the power transmission teeth 181 do not interfere with each other, and the second position restricting body 20 and the power transmission teeth 181 do not interfere with each other.

  As shown in FIG. 4, the contact surface 230 of the first band 23 on the side in contact with the tooth bottom 180 of the wheel 18 is in a straight line at the portion facing the guide plane 194, and is on the side in contact with the tooth bottom 180 of the wheel 18. The contact surface 240 of the second band 24 is in a straight line at a portion facing the guide plane 204. The guide planes 194 and 204 form an angle α (π / 5 in this embodiment). The first tangent line L1 at the intersection of the radial line 182 of the wheel 18 and the root circle 185 passing through the center in the circumferential direction of the power transmission tooth 181A meshing with the power receiving hole 231A of the first band 23; A radial line 182 of the wheel 18 passing through the center in the circumferential direction of the power transmission tooth 181B meshing with the power receiving hole 241B of the second band 24 and a second tangent line L2 at the intersection of the root circle 185 are formed. The angle is α.

  The pitch of the power receiving holes 231 of the first band 23 and the pitch of the power receiving holes 241 of the second band 24 are the same pitch P. Assuming that the number of teeth of the wheel 18 (number of power transmission teeth 181) is Z and the radius of the wheel 18 (distance from the rotation center C of the wheel 18 to the root of the wheel 18) is R, α / 2 = 2π / Z and A relationship of P = 2π × R / Z is set. In the present embodiment, Z = 20. When the minimum operating angle of the electric motor 17 is θ and n is a positive integer, a relationship of α / 2 = n × θ is set. In the present embodiment, θ = π / 100 and n = 10. The rotation stop position of the electric motor 17 is the rotation position at the interval of the minimum operation angle θ, and the rotation stop position of the wheel 18 is the interval of the minimum rotation angle (θ) corresponding to the minimum operation angle θ of the electric motor 17. Is the rotational position.

  FIG. 4 shows a state where the power transmission teeth 181A of the wheel 18 and the power receiving holes 231A of the first band 23 are completely meshed with each other. The state where the power transmission tooth 181A and the power receiving hole 231A are completely meshed with each other means that the radial line 182 of the wheel 18 that passes through the center in the circumferential direction of the power transmission tooth 181A meshed with the power receiving hole 231A. The virtual plane H <b> 1 orthogonal to the first band 23 is in a state parallel to the direction of the linear portion of the first band 23. A line passing through the intersection D of the first tangent line L1 and the second tangent line L2 and the rotation center C is defined as a reference line E1, and a line orthogonal to the reference line E1 and passing through the rotation center C is defined as a second line. The reference line E2. Then, the radius line 182 and the second reference line E2 form an angle α / 2, and the radius line 183 and the second reference line E2 form an angle α / 2. It is assumed that the electric motor 17 is rotated by the minimum operating angle θ (for example, counterclockwise) from the state of FIG. If it does so, the site | part of the tooth tip 184 corresponding to the intersection position G1, G2 of the tooth tip 184 of the power transmission teeth 181C, 181D on the first reference line E1 and the first reference line E1 will have the rotation center C. It moves on a straight line E11 that intersects the first reference line E1 at an angle θ.

  A pair of latching arms 25 and 26 are secured to the first band 23, and a pair of latching arms 27 and 28 are secured to the second band 24. The pair of latch arms 25 and 26 are supported by the first ear thread ridge 11, and the pair of latch arms 27 and 28 are supported by the second ear thread ridge 12. Yes. That is, the first band 23 supports the first ear thread ridge 11 and the second band 24 supports the second ear thread ridge 12.

  Next, the operation of the first embodiment will be described. In the following, the engagement position between the power receiving holes 231 and 241 and the power transmission teeth 181 may be referred to as the engagement position between the bands 23 and 24 and the wheel 18.

  The output shaft 171 of the electric motor 17 reciprocates and the wheel 18 reciprocates. The reciprocating rotation of the wheel 18 is transmitted to the first band 23 and the second band 24 through meshing between the power transmission teeth 181 and the power receiving holes 231 and 241. As a result, the first band 23 and the second band 24 move up and down in the guide grooves 221 and 222 in opposite directions. The first band 23 slidably contacts the opposing surface 191 (guide curved surface 193 and guide plane 194), and the second band 24 slidably contacts the opposing surface 201 (guide curved surface 203 and guide plane 204). Reciprocates. That is, the first position restricting body 19 is in contact with the first band 23 so as to restrict the meshing position of the first band 23 and the wheel 18, and the second position restricting body 20 is the second band 24. And the wheel 18 are in contact with the second band 24 so as to restrict the meshing position.

  When the first band 23 and the second band 24 move up and down in the guide grooves 221 and 222 in the opposite directions, the first ear thread ridge 11 and the second ear thread heel 12 move in the opposite directions. Move up and down. As a result, the ear thread 14 (see FIG. 1) passed through the first ear thread ridge 11 and the ear thread 15 (see FIG. 1) passed through the second ear thread collar 12 are wefted. Ears We (see FIG. 1) are formed across the wefts (not shown).

  The guide rail 22 is a third position restricting body having a pair of guide grooves 221 and 222 parallel to each other. The first position restricting body 19, the second position restricting body 20 and the guide rail 22 constitute guide means for guiding the first band 23 and the second band 24. This guide means brings the first band 23 and the second band 24 closer as the distance from the meshing position between the power transmission teeth 181 and the power receiving holes 231 and 241 increases. Next, the guiding means guides the first and second bands 23 and 24 so that a part of the first band 23 and a part of the second band 24 are adjacent and parallel to each other.

The following effects can be obtained in the first embodiment.
(1-1) In the present embodiment in which the relationship of α / 2 = 2π / Z and P = 2π × R / Z is set, the power transmission teeth 181A of the wheel 18 are the first band as shown in FIG. 23, the power transmission teeth 181B of the wheel 18 are completely engaged with the power receiving holes 241B of the second band 24. The state where the power transmission teeth 181B and the power receiving holes 241B are completely meshed with each other means that the radial line 183 of the wheel 18 that passes through the center in the circumferential direction of the power transmission teeth 181B meshed with the power receiving holes 241B. The virtual plane H <b> 2 orthogonal to the second band 24 is parallel to the direction of the straight portion of the second band 24.

  FIG. 5 shows a state in which the wheel 18 is rotated by an angle less than θ / 10 from the state of FIG. Also in the state of FIG. 5, the meshing state between the power receiving hole 231 on the first band 23 side and the power transmission teeth 181 on the wheel 18 is the power of the power receiving hole 241 on the second band 24 side and the power of the wheel 18. This is the same as the meshing state with the transmission teeth 181.

  FIG. 6 shows an example in which a relationship of α / 2 = m × 2π / Z [m is a positive integer or a positive half integer (1/2, 3/2, 5/2...)] Is not set. Indicates. In the example of FIG. 6, the angle α1 formed by the first tangent line L1 and the second tangent line L2 is larger than the angle α. As shown in FIG. 6, when the power transmission teeth 181 of the wheel 18 are completely engaged with the power receiving holes 241 of the second band 24, the power transmission teeth 181 of the wheel 18 have the power of the first band 23. There is no complete engagement with the receiving hole 231. That is, when the relationship of α / 2 = m × 2π / Z (m is a positive integer or a positive half integer) is not set, the power receiving hole 231 on the first band 23 side and the wheel 18 are set. The meshing state with the power transmission teeth 181 and the meshing state between the power receiving holes 241 on the second band 24 side and the power transmission teeth 181 of the wheel 18 are not the same.

  In the present embodiment in which the relationship of α / 2 = 2π / Z and P = 2π × R / Z is set, the engagement between the power receiving hole 231 on the first band 23 side and the power transmission teeth 181 of the wheel 18 The state and the meshing state of the power receiving hole 241 on the second band 24 side and the power transmission tooth 181 of the wheel 18 are always the same. Therefore, the load applied from the power transmission tooth 181 of the wheel 18 to the wall surface 232 of the power receiving hole 231 of the first band 23 is the wall surface of the power receiving hole 241 of the second band 24 from the power transmission tooth 181 of the wheel 18. It becomes the same as the load applied to 242. As a result, the difference between the progress of wear on the wall surface 232 of the power receiving hole 231 of the first band 23 and the progress of wear on the wall surface 242 of the power receiving hole 241 of the second band 24 is eliminated.

  (1-2) When the acceleration of the bands 23 and 24 is maximum, that is, when the rotation direction of the wheel 18 is switched, when the rotation of the electric motor 17 is stopped (when the rotation direction of the electric motor 17 is switched). is there. When the rotation direction of the wheel 18 is switched, the load applied to the wall surfaces 232 and 242 of the power receiving holes 231 and 241 becomes the largest. Therefore, from the viewpoint of suppressing wear of the wall surfaces 232 and 242, when the rotation direction of the wheel 18 is switched, the power receiving holes 231 and 241 of the first and second bands 23 and 24 and the power transmission teeth 181 of the wheel 18 It is desirable that is completely meshed. When the electric motor 17 having the minimum operation angle θ is used, the minimum rotation angle of the wheel 18 is θ. When the relationship of α / 2 = n × θ is set, the power receiving holes 231 and 241 of the first and second bands 23 and 24 and the power transmission teeth of the wheel 18 when the rotation direction of the wheel 18 is switched. 181 can be set in a fully meshed state.

  (1-3) The linear state portion of the first band 23 facing the guide plane 194 is in contact with the tooth bottom of the wheel 18, and the linear state portion of the second band 24 facing the guide plane 204 is The wheel 18 is in contact with the tooth bottom. The power receiving hole 231 in the straight portion of the first band 23 and the power receiving hole 241 in the straight portion of the second band 24 mesh with the power transmission teeth 181 of the wheel 18.

  It is assumed that the first and second bands 23 and 24 are wound around the wheel 18 and the power receiving holes 231 and 241 are engaged with the power transmission teeth 181. If it does so, the sliding resistance between the guide member and the 1st, 2nd bands 23 and 24 which guide the 1st and 2nd bands 23 and 24 in the state wound around the wheel 18 will become large. Such a large sliding resistance is an obstacle to smoothly reciprocating the first and second bands 23 and 24.

The configuration in which the linear portions of the first and second bands 23 and 24 are in contact with the wheel 18 is advantageous in smoothly reciprocating the first and second bands 23 and 24.
(1-4) The configuration of α / 2 = 2π / Z is advantageous for smoothing the reciprocation of the first and second bands 23 and 24 by suppressing the magnitude of the angle α.

  (1-5) The guide means composed of the first position restricting body 19, the second position restricting body 20, and the guide rail 22 increases as the distance from the meshing position between the power transmission teeth 181 and the power receiving holes 231 and 241 increases. The first band 23 and the second band 24 are brought closer to each other. Next, the guiding means makes a part of the first band 23 and a part of the second band 24 parallel to each other. Such a guiding means is suitable for connecting the parallel portions of the flexibly deformable bands 23 and 24 to the first ear thread ridge 11 and the second ear thread ridge 12 which are parallel to each other.

(1-6) The electric motor 17 that can handle the formation of various ear tissues independently of the loom drive motor (not shown) is suitable as a drive source for reciprocatingly rotating the wheel 18.
(1-7) The first band 23 is in sliding contact with the metal first position restricting body 19 and the metal guide rail 22, and the second band 24 is made of the metal second position restricting body 20. The metal guide rail 22 is in sliding contact. The sliding resistance between the fiber reinforced plastic reinforced with carbon fiber and the metal is small. A fiber reinforced plastic reinforced with carbon fiber is suitable as a material of the bands 23 and 24 that can be bent and deformed.

In the present invention, the following embodiments are also possible.
(1) The relationship of α / 2 = m × 2π / Z may be set with m being an integer of 2 or more. The embodiment of FIG. 7 shows a case where Z and R are the same as those in the first embodiment and m = 2. In this case, α / 2 = π / 5. Even in such a setting, the same effect as the item (1-1) in the first embodiment can be obtained. If the relationship of α / 2 = n × θ is set, the same effect as the item (1-2) in the first embodiment can be obtained.

  (2) A relationship of α / 2 = m × 2π / Z may be set, where m is a positive half integer. The embodiment of FIG. 8A shows a case where Z and R are the same as in the first embodiment and m = 1/2. In this case, α / 2 = π / 20. The embodiment of FIG. 8B shows a case where Z and R are the same as those in the first embodiment and m = 3/2. In this case, α / 2 = 3π / 20. Even in such a setting, the same effect as the items (1-1) and (1-4) in the first embodiment can be obtained. If the relationship of α / 2 = n × θ is set, the same effect as the item (1-2) in the first embodiment can be obtained.

(3) The power receiving holes 231 and 241 and the power transmission teeth 181 may be engaged with each other so that the first band 23 and the second band 24 are wound around the wheel 18.
(4) As the first band 23 and the second band 24, band-shaped metal plates that can be bent and deformed may be used.

(5) The first band 23 and the second band 24 may be integrated so as to be continuous around the upper side of the wheel 18.
(6) A reduction gear mechanism or a speed increasing gear mechanism may be interposed between the output shaft 171 of the electric motor 17 and the wheel 18. In this case, if β is a reduction ratio or speed increasing ratio and k is a positive integer, β = k / n may be satisfied. Then, if the minimum operating angle of the electric motor 17 is θo, α / 2 = n × θ becomes α / 2 = n × β × θo = k × θo.

The technical idea that can be grasped from the embodiment described above will be described below.
[1] In any one of claims 1 to 5, the wheel is driven by an electric motor that stops rotating at intervals of a minimum operating angle, and a relationship of α / 2 = n × θ is set. When the electric motor switches the rotation direction, the power receiving hole of the first band and the driving force transmission tooth of the wheel are completely engaged, and the power receiving hole of the second band and the wheel An ear forming device in a loom in which driving force transmission teeth are completely meshed with each other.

Since the power receiving hole and the power transmission hole are completely meshed when the rotation direction of the electric motor where the acceleration of the band is maximized is switched, the effect of suppressing wear on the wall surface of the power receiving hole is obtained.
[2] In any one of [1] to [5] and [1], the first band and the second band are ears in a loom made of fiber reinforced plastic reinforced with carbon fiber. Forming equipment.

  The sliding resistance between the fiber reinforced plastic reinforced with carbon fiber and the metal is small, and the fiber reinforced plastic reinforced with carbon fiber is suitable as a material for a band that can be bent and deformed.

1 is a side sectional view showing a first embodiment. (A) is a sectional side view. (B) is the sectional view on the AA line of Fig.2 (a). (A) is a front sectional view. (B) is a back sectional view. FIG. FIG. Partial enlarged side sectional view of an example that does not satisfy α / 2 = m × 2π / Z. The partial expanded side sectional view which shows another embodiment. (A), (b) is a partial expanded side sectional view which shows another embodiment.

Explanation of symbols

  11: First ear thread bag. 12: Second ear thread bag. 17: Electric motor. 18 ... wheel. 181, 181 A, 181 B, 181 C, 181 D... Power transmission teeth. 182, 183 ... Radius line. 185 ... The root circle. 19: A first position restricting body constituting the guiding means. 20 ... 2nd position control body which comprises a guidance means. 193, 203 ... Guide curved surface. 194, 204 ... Guide plane. 22 A guide rail as a third position restricting body constituting the guiding means. 23. First band. 24 ... The second band. 231, 231 A, 241, 241 B... Power receiving holes. We ... ears. L1 is the first tangent. L2 is the second tangent. α: angle formed by the first tangent and the second tangent, Z: number of teeth of the wheel, R: radius of the wheel, P: pitch of the power receiving hole, m: positive integer or positive half integer, θ ... the minimum operating angle of the electric motor and the minimum rotation angle of the wheel. n is a positive integer.

Claims (5)

An ear forming device in a loom for forming an ear based on the operations of a first ear thread ridge and a second ear thread heel reciprocating in opposite directions,
A first deformable deformable band in which a plurality of power receiving holes are arranged;
A flexibly deformable second band in which a plurality of power receiving holes are arranged;
A wheel having a plurality of power transmission teeth respectively meshing with the power receiving holes of the first band and the second band;
The first band supports the first ear thread ridge, the second band supports the second ear thread heel, and the first band and the second band are In the ear forming device in the loom facing each other with the wheel sandwiched in a deformed state so as to mesh each power receiving hole and the power transmission tooth,
The first tangent at the intersection of the radial line of the wheel passing through the center in the circumferential direction of the power transmission tooth meshed with the power receiving hole of the first band and the root circle, and the power of the second band The angle formed by the second tangent at the intersection of the radial line of the wheel passing through the center in the circumferential direction of the power transmission tooth meshing with the receiving hole and the root circle is α, the number of teeth of the wheel is Z, When the radius of the wheel is R, the pitch of the power receiving holes between the first band and the second band is P, and m is a positive integer or a positive half integer, α / 2 = m × 2π / Z and An ear forming device in a loom in which a relationship of P = 2π × R / Z is set.   The wheel is driven by an electric motor that stops at a rotational position at a minimum operating angle interval, and the minimum rotational angle of the wheel corresponding to the minimum operating angle of the electric motor is θ and n is a positive integer. The ear forming device for a loom according to claim 1, wherein a relationship of α / 2 = n × θ is set.   The power receiving hole in the straight portion of the first band and the power receiving hole in the straight portion of the second band mesh with the power transmission teeth of the wheel. The ear | edge formation apparatus in the loom of any one of these.   The ear forming device for a loom according to any one of claims 1 to 3, wherein the m is 1/2, 1 or 3/2.   Guiding means for guiding the first band and the second band is provided, and the guiding means moves away from the meshing position of the power transmission teeth and the power receiving holes, and the first band and the second band. The ear in the loom according to any one of claims 1 to 4, wherein the ears are brought close to each other, and then a part of the first band and a part of the second band are made side by side parallel to each other. Forming equipment.

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