JP2007021559A - Device for feeding wire rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire rod feeding device with which the feeding and stopping of the wire rod can be quickly changed and the stopping of a motor caused by overload can be prevented. <P>SOLUTION: Since a plurality of feeding mechanism parts 20A are driven with a plurality of feeding motors 45 in this device, the responsiveness to an operation command is improved because each feeding motor 45 is minimized as compared with the case where the device is driven with one feeding motor and the feeding and the stopping of the wire rod can be quickly changed. Even when the load is varied among the plurality of feeding mechanism parts 20A, the load is composed by only one torque transmitting part 49 provided between a linked feeding mechanism part group 20G and a linked feeding motor group 45G and the load is imparted to the whole of the linked feeding mechanism part group 20G. Then, the load in the whole of the linked feeding mechanism part group 20G is dispersed to the plurality of feeding motors 45 and the stopping of the motor caused by the overload is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wire feeding device that feeds a wire by sandwiching the wire between a plurality of rollers and rotationally driving the rollers with a feed motor.

The conventional wire feeding device shown in FIG. 7 is provided with a plurality (specifically, two) of feeding mechanisms 3. Each feed mechanism section 3 is provided with a pair of rollers 2 and 2 arranged one above the other with the wire 1 in between, and the rotational position of the rollers 2 and 2 is controlled by a feed motor (not shown) to feed the wire 1 (See, for example, Patent Document 1). One feed motor is provided as a common drive source for both feed mechanism sections 3 and 3, and two feed motors are provided as separate drive sources for each feed mechanism section 3. Is known.
JP 2001-340931 A (paragraph [0036], FIGS. 1 and 2)

  However, as described above, in the case where one feeding motor is provided and used as a common drive source for both feeding mechanisms 3 and 3, the feeding motor is increased in size. When the feed motor is enlarged, the rotor inertia of the feed motor is also increased, so that the responsiveness to the operation command is deteriorated, and there is a problem that the wire 1 cannot be quickly switched between feeding and stopping. Further, in the case where two feeding motors are provided and used as separate driving sources for each feeding mechanism unit 3, when the load varies between the feeding mechanism units 3 and 3, one feeding motor is provided. Only the load is biased, and the feeding motor may stop due to overload.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wire supply device that can quickly switch between feeding and stopping of a wire and can prevent a motor from being stopped due to overload. .

  In order to achieve the above object, a wire feeding device according to the invention of claim 1 comprises a feeding mechanism unit configured by connecting a pair of rollers arranged with a wire interposed therebetween so as to be able to rotate symmetrically. In a wire feeding device that feeds a wire by driving a plurality of feeding mechanisms with a plurality of feeding motors, the feeding mechanisms are linked to each other so that they can be linked. In addition to constituting a feed mechanism section group, a plurality of feed motors are linked so as to be interlocked to form an interlock feed motor group, and torque is generated between the interlock feed mechanism section group and the interlock feed motor group. A characteristic is that one torque transmitting portion capable of transmitting is provided.

  Here, “provided one torque transmission unit” means that there are no two or more routes through which torque can be transmitted simultaneously between the interlocking feeding mechanism unit group and the interlocking feeding motor group. . Further, “providing one torque transmitting portion” does not exclude that the torque transmitting portion is composed of a plurality of parts. Furthermore, the case where the torque transmission unit itself has a plurality of paths through which torque can be transmitted and any one of these paths is alternatively used is also included.

  The invention of claim 2 is the wire rod feeding device according to claim 1, wherein the number of feeding motors constituting the interlocking feeding motor group is determined from the number of feeding mechanism parts constituting the interlocking feeding mechanism portion group. It has many features.

  According to a third aspect of the present invention, in the wire rod feeding device according to the first or second aspect, the wire rod feeding device includes at least three feeding mechanism portions, and the wire pinching force by a pair of rollers is forward of the wire rod feeding direction. It is characterized by its gradually increasing size as it goes to.

  According to a fourth aspect of the present invention, in the wire rod feeding device according to any one of the first to third aspects, the position of one of the plurality of feeding motors constituting the interlocking feeding motor group can be controlled. This is characterized in that it is constituted by one servo motor and the remaining feeding motor is constituted by a second servo motor capable of force control.

  A fifth aspect of the invention is characterized in that, in the wire rod feeding device according to any one of the first to fourth aspects, the feeding motor is an ultra-low inertia motor.

[Invention of Claim 1]
In the configuration of claim 1, a plurality of feeding mechanism units are driven by a plurality of feeding motors, so that each feeding motor is different from the conventional one in which a plurality of feeding mechanism units are driven by one feeding motor. The size is reduced, the response to the operation command is improved, and it is possible to quickly switch between feeding and stopping of the wire rod. Moreover, even if the load varies among a plurality of feeding mechanism units, the loads are combined by a torque transmission unit provided between the linked feeding mechanism unit group and the linked feeding motor group and linked feeding. It is given to the entire motor group. Thereby, the entire load of the interlocking feeding mechanism section group is distributed to the plurality of feeding motors, and the motor stop due to overload can be prevented.

[Invention of claim 2]
In the configuration of claim 2, since the number of the feeding motors constituting the interlocking feeding motor group is increased from the number of the feeding mechanism parts constituting the interlocking feeding mechanism portion group, the size of the feeding motor is not increased. In addition, it is possible to increase the overall output torque of the interlocking feeding motor group while ensuring the agility of feeding / stopping the wire.

[Invention of claim 3]
As in the configuration of claim 3, at least three feeding mechanism portions are provided, and the pinching force of the wire by the rollers of each of the feeding mechanism portions is gradually increased toward the front in the feeding direction of the wire. This makes it possible to feed the wire smoothly.

[Invention of claim 4]
In the configuration of claim 4, position control is performed by one of the plurality of feed motors, and force control is performed by the remaining feed motors, so the load is evenly distributed among the plurality of feed motors. However, it becomes possible to control the feeding amount of the wire.

[Invention of claim 5]
According to the fifth aspect of the present invention, since the feeding motor is composed of an ultra-low inertia motor, the wire feeding operation can be switched more quickly.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment according to the invention will be described with reference to FIGS.
The spring molding machine 10 shown in FIG. 1 includes a substrate 30 that is vertically erected and assembled with a forming tool 14T, 15T, a cutting tool 13T, a mandrel tool 12, and the like in addition to the wire rod feeding device 20S according to the present invention. Yes. The mandrel tool 12 protrudes from the front surface of the substrate 30, one forming tool 15T is disposed obliquely below the mandrel tool 12, the other forming tool 14T is disposed obliquely above the mandrel tool 12, A cutting tool 13T is disposed above the mandrel tool 12. The cutting tool 13T and the forming tools 14T, 15T move linearly with the servo motors 13M, 14M, 15M as drive sources, respectively, and move forward and backward with respect to the forming space R in the vicinity of the mandrel tool 12. When the wire rod feeding device 20S feeds the wire rod 90 to the forming space R, as shown in FIG. 2, the wire rod 90 is slidably contacted with the tip surfaces of the respective forming tools 14T and 15T and is plastically deformed in an arc shape. A coil spring is formed so as to surround the gold tool 12. When the spring length of the coil spring reaches a predetermined length, the cutting tool 13T advances to the forming space R side, and a part of the wire 90 is cut between the edge of the cutting tool 13T and the edge of the mandrel tool 12. Then, the coil spring having a predetermined length is separated from the subsequent wire 90. In addition, wire rod sliding contact grooves 14Z and 15Z for guiding the wire rod 90 are formed on the tip surfaces of the forming tools 14T and 15T.

  As shown in FIG. 1, the wire feeding device 20S includes four feeding mechanisms 20A arranged in the horizontal direction. Each feeding mechanism section 20A has a pair of rollers 21 and 21 arranged vertically. In order to pivotally support the rollers 21 and 21, as shown in FIG. 3, a pair of roller support shafts 25A and 25B are rotatably assembled to the substrate 30 and the base 31 behind it (left side in FIG. 3). It has been. These roller support shafts 25A and 25B are aligned vertically in parallel and the rollers 21 and 21 are fitted to one end of each of the roller support shafts 25A and 25B. Each roller 21 is pinned to a flange portion 25F formed integrally with the roller support shafts 25A and 25B (the pin is not shown) and screwed to one end face of each roller support shaft 25A and 25B. It is retained by the board 22. In addition, gears 26 and 26 are provided on the other end sides of the roller support shafts 25A and 25B, respectively, and the upper and lower rollers 21 and 21 rotate in contrast to each other when the gears 26 and 26 are engaged with each other.

  As shown in FIG. 4, a pair of grooves 21 </ b> M and 21 </ b> N extend in the circumferential direction on the outer peripheral surface of the roller 21. The inner surfaces of both the grooves 21M and 21N have arc shapes with different curvatures, and the large grooves 21N and 21N and the small grooves 21M and 21M face each other between the rollers 21 and 21. Further, the arrangement of the large and small grooves 21M and 21N can be reversed by attaching the rollers 21 and 21 to the roller support shafts 25A and 25B with the reverse sides of the rollers 21 and 21 with respect to the state of FIG. The wire 90 is passed between the grooves 21N and 21N facing each other at the position close to the substrate 30, and is sandwiched between the rollers 21 and 21. In this state, the rollers 21 and 21 are slightly separated from each other, so that the holding force of the rollers 21 and 21 is applied to the wire 90.

  As shown in FIG. 1, the wire rod 90 is sandwiched between rollers 21 and 21 in all the feeding mechanism portions 20A so as to cross the entire four feeding mechanism portions 20A. Thereby, the wire 90 extends in the horizontal direction, and the tip thereof faces the molding space R. Further, in the feeding direction of the wire rod 90, a nozzle 70 is provided along the feed line of the wire rod 90 between the front and rear of the feeding mechanism portion 20A group and between the adjacent feeding mechanism portions 20A, 20A. The wire 90 is guided through the inside of the nozzle 70.

  As shown in FIG. 3, a block accommodation hole 30A extending in the vertical direction is formed in a portion of the substrate 30 through which the roller support shafts 25A and 25B penetrate. A pair of blocks 24, 24 are accommodated in a vertically overlapping manner at the lower end side of the block accommodation hole 30A. The lower block 24 is fixed to the substrate 30, and the upper block 24 is movable up and down. One end portions of the roller support shafts 25A and 25B are rotatably supported by the blocks 24 and 24. An air cylinder 23 is fixed to the upper end of the block accommodation hole 30A, and a linear motion rod 23R extending downward from the air cylinder 23 is connected to the upper block 24. The bearing 25R that pivotally supports the end of the upper roller support shaft 25A away from the roller 21 has a structure that allows the roller support shaft 25A to swing. And the clamping force of the wire 90 by the rollers 21 and 21 can be changed by adjusting the air supply pressure to the air cylinder 23. Further, in the present embodiment, the clamping force of the rollers 21 and 21 in the feeding mechanism portion 20A is set so as to gradually increase toward the front in the feeding direction of the wire 90 (on the molding space R side).

  Now, the above-mentioned four feeding mechanism parts 20A are connected so as to be interlocked to constitute an interlocking feeding mechanism part group 20G according to the present invention. Specifically, as shown in FIG. 6, a relay gear 46 is provided between the adjacent feeding mechanism portions 20A and 20A, and the lower roller support shaft 25B in both the feeding mechanism portions 20A and 20A, The gears 26 and 26 supported by the shaft 25B mesh with the relay gear 46 in common. As a result, the rollers 21 and 21 of the four feeding mechanisms 20A rotate in conjunction with each other.

  Of the four feeding mechanisms 20A, for example, the feeding mechanism 20A closest to the molding space R (the rightmost feeding mechanism 20A in FIG. 1 and the leftmost feeding mechanism 20A in FIG. 6) includes The torque transmission part 49 which concerns on invention is connected. As shown in FIG. 3, the torque transmission unit 49 includes a pair of torque transmission shafts 28 </ b> A and 28 </ b> B and a speed reducer 44. These torque transmission shafts 28 </ b> A and 28 </ b> B are arranged vertically and pivotally supported by the base 31 at both ends. A movable pair gear 41 is assembled to the upper torque transmission shaft 28A so as to be integrally rotatable and slidable, and a fixed pair gear 40 is assembled to the lower torque transmission shaft 28B so as to be integrally rotatable and non-slidable.

  The fixed pair gear 40 is integrally provided with a small gear 40A and an intermediate gear 40B. On the other hand, the movable pair gear 41 is formed by integrating a large gear 41A and an intermediate gear 41B. The large gear 41A of the movable pair gear 41 is arranged on the side corresponding to the small gear 40A of the fixed pair gear 40, and the middle gear 41B of the movable pair gear 41 is arranged on the side corresponding to the middle gear 40B of the fixed pair gear 40. Further, between the large gear 41A and the middle gear 41B, a relay portion 41C having an outer diameter smaller than the tooth bottom diameter of the middle gear 41B is provided. When the movable pair gear 41 is arranged on one end side of the slidable stroke, the large gear 41A of the movable pair gear 41 and the small gear 40A of the fixed pair gear 40 are engaged with each other as shown in FIG. The middle gear 40B faces the relay portion 41C, and both the middle gears 40B and 41B idle. On the other hand, when the movable pair gear 41 is arranged on the other end side of the stroke, the middle gear 41B of the movable pair gear 41 and the middle gear 40B of the fixed pair gear 40 are engaged with each other, and the small gear 40A of the fixed pair gear 40 is connected to the relay portion 41C. The large and small gears 40A and 41A are idled facing each other. Thus, the gear ratio can be changed between the upper and lower torque transmission shafts 28A and 28B.

  In addition, a lever locking groove 41D is formed in the relay portion 41C of the movable pair gear 41 in the circumferential direction, and a lever 29 for manually sliding the movable pair gear 41 is locked therein. Further, a pair of limit switches 42A and 42B are provided in the swing region of the lever 29. Based on the detection signals output from the limit switches 42A and 42B, it is determined whether the movable pair gear 41 is disposed on one end side or the other end side of the slidable stroke.

  An output gear 27 is assembled to an end of the upper torque transmission shaft 28A opposite to the movable pair gear 41 so as to be integrally rotatable. The output gear 27 meshes with the gear 26 of the lower roller support shaft 25B in the feeding mechanism 20A on the molding space R side. Thereby, the torque transmission part 49 is connected with the interlocking feeding mechanism part group 20G.

  Further, a position near the rear end of the torque transmission shaft 28B (position near the end away from the substrate 30) is pivotally supported via a bearing on an upright wall 31A provided on the base 31, so that the rear of the torque transmission shaft 28B. The end portion protrudes rearward from the upright wall 31A. An outer case 44H of the speed reducer 44 is fixed to an upright wall 31B facing the rear of the upright wall 31A, and the output rotation shaft 44S of the speed reducer 44 and the lower torque transmission shaft between the upright walls 31A and 31B. The rear end of 28 </ b> B is connected by a shaft coupling 43.

  A feed motor 45 is connected to the input side of the speed reducer 44. Specifically, as shown in FIG. 5, a cylindrical sleeve 51 is fixed to a rear end portion of the outer case 44 </ b> H in the speed reducer 44, and an input rotary shaft 52 of the speed reducer 44 is a bearing inside the cylindrical sleeve 51. It is rotatably supported by 52B1 and 52B2. The input rotation shaft 52 includes a gear portion 52G, a pulley support portion 52P, and a motor connection portion 52C in order from the speed reducer 44 side. The outer diameter of the pulley support portion 52P is slightly larger than that of the gear portion 52G, and the outer diameter of the motor connection portion 52C is approximately twice the outer diameter of the pulley support portion 52P. The end of the motor connecting portion 52C on the pulley support portion 52P side is pivotally supported by one bearing 52B1, and the end of the pulley support portion 52P on the gear portion 52G side is pivotally supported by the other bearing 52B2. .

  The gear portion 52G enters into the outer case 44H and meshes with a gear (not shown) that constitutes the speed reducer 44. A cylindrical hole (not shown) is formed in the central portion of the motor connecting portion 52C, and the output rotation shaft 45S of the feed motor 45 is inserted therein and key-coupled. The stator 45H of the feed motor 45 is fixed to the rear end portion of the cylindrical sleeve 51.

  Further, the wire feeding device 20S including this feeding motor 45 is provided with a total of four feeding motors 45 (only three feeding motors 45 are shown in FIG. 5). All of these four feeding motors 45 are so-called ultra-low inertia motors, and are longer in the axial direction than ordinary cylindrical motors, thereby suppressing rotor inertia.

  The four feed motors 45 are arranged at equal intervals in the horizontal direction. Specifically, as shown in FIG. 5, the upright wall 31B of the base 31 is bent in a crank shape in the direction in which the feed motors 45 are arranged, and the speed reducer 44 is located on one end side from the crank-like bent portion of the upright wall 31B. The wall surface on the other end side of the crank-shaped bent portion of the upright wall 31B and the rear end surface of the speed reducer 44 are flush with each other. The same cylindrical sleeve 51 as the cylindrical sleeve 51 attached to the speed reducer 44 is attached to the wall surface on the other end side of the upright wall 31B at a distance from each other (see FIG. Only two cylindrical sleeves 51 are shown in addition to the attached cylindrical sleeve 51). And the stator 45H of the feed motor 45 is being fixed to each rear-end part of these three cylindrical sleeves 51, respectively.

  Further, a connecting rotary shaft 56 is rotatably supported by bearings 52B1 and 52B2 on the cylindrical sleeve 51 other than the cylindrical sleeve 51 attached to the speed reducer 44. The connecting rotary shaft 56 includes a pulley support portion 52P and a motor connecting portion 52C, and an output rotary shaft 45S of the feed motor 45 is inserted into a cylindrical hole (not shown) formed in the motor connecting portion 52C and is key-coupled. .

  Of the four cylindrical sleeves 51, a pair of pulleys 53 and 54 are accommodated in the two central cylindrical sleeves 51 (two cylindrical sleeves 51 on the right side in FIG. 5) and are fitted to the pulley support portion 52P. One of the pulleys 53 is screwed to the end surface of the motor connecting portion 52 </ b> C, and the other pulley 54 is screwed to the end surface of the pulley 53. Further, in the central two cylindrical sleeves 51, 51, a part of a part facing the outer peripheral surface of one pulley 53 and a part of a part facing the outer peripheral surface of the other pulley 54 are respectively cut off and the belt Insertion holes 51W1 and 51W2 are formed. These belt insertion holes 51W1 and 51W2 are open in opposite directions, and between the two central cylindrical sleeves 51 and 51, one belt insertion hole 51W1 and 51W1 located on the feeding motor 45 side face each other. However, the other belt insertion holes 51W2 and 51W2 positioned on the upright wall 31B side face each other. A timing belt 55 is passed between the pulleys 53 and 53 facing each other through the belt insertion holes 51W1 and 51W1 between the cylindrical sleeves 51 and 51.

  Two cylindrical sleeves 51 at both ends of the four cylindrical sleeves 51 (FIG. 5 shows only the cylindrical sleeve 51 on the side close to the molding space R of the two cylindrical sleeves 51 on the left side). Only one pulley 54 and one belt insertion hole 51W2 are provided. Further, between the two cylindrical sleeves 51 at both ends and the two central cylindrical sleeves 51, the belt insertion holes 51W2 and 51W2 on the upright wall 31B side face each other. Between the two cylindrical sleeves 51 at both ends and the two central cylindrical sleeves 51, a timing belt 55 is passed between the pulleys 54 and 54 facing each other through the belt insertion holes 51W2 and 51W2. With these configurations, as shown in FIG. 6, the output rotation shafts 45S of the four feed motors 45 are connected so as to be interlocked, thereby configuring an interlocked feed motor group 45G according to the present invention.

  A pulley 60 is provided between the adjacent cylindrical sleeves 51 and 51, and these pulleys 60 are pressed against the inner surface of the timing belt 55. As shown in FIG. 5, the pulley 60 is assembled to a rib 31 </ b> C protruding from the upright wall 31 </ b> A or the upright wall 31 </ b> B of the base 31 and can be moved up and down by an adjustment mechanism (not shown). Thereby, the tension of the timing belt 55 can be adjusted.

  All the feed motors 45 are driven and controlled by a motor control device (servo amplifier) (not shown) provided in the spring molding machine 10. Here, the motor control device performs position control for one feeding motor 45 arranged coaxially with the speed reducer 44 and performs force control for the remaining three feeding motors 45. Yes. That is, in this embodiment, one feeding motor 45 arranged coaxially with the speed reducer 44 corresponds to the “first servo motor” according to the present invention, and the remaining three feeding motors 45 are This corresponds to a “second servo motor”.

  Specifically, the motor control device stores rotational position data relating to the position control feed motor 45 as a substitute value for the rotational position of the roller 21. In addition, the motor control device captures a detection signal of a rotational position sensor 45E (specifically, an encoder or resolver) provided in each feed motor 45 and detection signals of limit switches 42A and 42B. Based on the detection signals of the limit switches 42A and 42B, the motor control device specifies a reduction ratio (gear ratio) between the feed motor 45 and the roller 21, and the reduction ratio and rotational position data of each output rotary shaft 45S. Based on the above, a command value for the rotational position of the output rotary shaft 45S for each predetermined period is generated. Then, a motor drive current corresponding to the deviation between the rotational position of the actual output rotary shaft 45S detected by the rotational position sensor 45E of the feed motor 45 for position control and the command value is passed through each feed motor 45, The rotational position of the output rotation shaft 45S in the feed motor 45 is controlled. Thereby, it is possible to accurately feed the wire 90 to the forming space R by a predetermined amount. Further, the motor control device calculates a load applied to the feeding motor 45 based on, for example, a motor driving current flowing through the feeding motor 45 for position control. Then, the motor drive current to be passed to the force control feed motor 45 is determined so that the four feed motors 45 bear the load substantially evenly, and each of the feed motors 45 is driven.

Next, the operation of the present embodiment configured as described above will be described.
When the spring molding machine 10 is started, the motor control device drives and controls all the feeding motors 45 provided in the wire feeding device 20S, and feeds the wire 90 intermittently toward the forming space R by a predetermined amount. Then, a predetermined amount of the wire 90 fed is slidably contacted with the forming tools 14T and 15T in the forming space R and formed into a coil spring. When the coil spring reaches a predetermined spring length, the coil spring is cut off from the subsequent wire 90 by the mandrel tool 12 and the cutting tool 13T. Thereby, a coil spring is manufactured sequentially.

  Here, in the wire rod feeding device 20S of the present embodiment, since the pinching force of the wire rod 90 by the feeding mechanism portion 20A is gradually increased toward the molding space R, the pinching force of all the feeding mechanism portions 20A is increased. The wire rod 90 can be fed smoothly as compared with the case of uniformization.

  By the way, when the wire rod feeding device 20S feeds the wire rod 90, the sliding resistance between the wire rod 90 and the forming tools 14T and 15T and the bending reaction force of the wire rod 90 are loaded on the feed motor 45 via the rollers 21 and 21, respectively. Take it. Here, the load increases as the wire diameter of the wire 90 increases and as the diameter of the coil spring to be manufactured decreases. On the other hand, since the wire rod feeding device 20S of the present embodiment is configured to drive the plurality of feeding mechanism portions 20A by the plurality of feeding motors 45, a plurality of feeding by the single feeding motor 45 is performed. The feed motor 45 can be downsized as compared with the conventional one that drives the mechanism portion 20A. Thereby, the rotor inertia of the feeding motor 45 is also reduced, the responsiveness to the operation command is improved, and the feeding / stopping of the wire 90 can be quickly switched. Moreover, since the feed motor 45 is an ultra-low inertia motor, the wire feeding operation can be switched more quickly. Further, since position control is performed by one of the plurality of feed motors 45 and force control is performed by the remaining feed motors 45, the load is evenly distributed among the plurality of feed motors 45. However, it is possible to control the feeding amount of the wire 90.

  Further, since the clamping force of the wire 90 by the feeding mechanism portion 20A is gradually increased toward the forming space R, the feeding resistance, that is, the load is different between the feeding mechanism portions 20A. In contrast, the wire rod feeding device 20S of the present embodiment has a configuration in which only one torque transmission portion 49 capable of transmitting torque is provided between the interlocking feeding mechanism portion group 20G and the interlocking feeding motor group 45G. Therefore, even if the load is different (or varies) among the plurality of feeding mechanism units 20A, the loads are combined by the torque transmission unit 49 and applied to the entire linked feeding motor group 45G. Thereby, it is possible to prevent the entire load of the interlocking feeding mechanism section group 20G from being distributed to the plurality of feeding motors 45 and stopping one feeding motor 45 due to overload.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.
(1) In the above embodiment, the number of the feeding mechanism units 20A constituting the interlocking feeding mechanism unit group 20G and the number of the feeding motors 45 constituting the interlocking feeding motor group 45G are the same. You may vary those numbers. In this case, if the number of the feeding motors 45 constituting the interlocking feeding motor group 45G is increased from the feeding mechanism part 20A constituting the interlocking feeding mechanism part group 20G, the size of the feeding motor 45 is not increased. The overall output torque of the interlocking feeding motor group 45G can be increased while ensuring the agility of feeding / stopping of the wire rod.

  (2) In the above embodiment, the reduction ratio (gear ratio) between the feed motor 45 and the roller 21 can be changed. However, the reduction ratio between the feed motor and the roller is fixed. Also good.

  (3) Although the wire rod 90 fed by the wire rod feeding device 20S of the above embodiment has a circular cross section, the wire rod may have a rectangular cross section.

  (4) In the above embodiment, the speed reducer 44 is provided between the feed motor 45 and the torque transmission shaft 28B. However, the output rotation shaft 45S of the feed motor 45 is torque transmitted without the speed reducer 44 being provided. You may make it the structure connected with the shaft 28B.

  (5) In the embodiment described above, the resultant force of the feed motor 45 is input to the roller support shaft 25B of the feed mechanism portion 20A closest to the molding space R among the four feed mechanism portions 20A. However, you may make it input into either of the roller support shafts 25B with which the other three feeding mechanism parts 20A were equipped.

  (6) In the above embodiment, the present invention is applied to the wire feeding device 20S provided in the spring forming machine 10, but the wire provided in the wire processing machine for manufacturing products other than the spring from the wire 90. The present invention may be applied to a feeding device.

  (7) In the above embodiment, the gears are connected between the roller support shafts 25A and 25B and between the lower roller support shaft 25B and the upper torque transmission shaft 28A, but these are connected by a timing belt. May be. Further, the two adjacent roller support shafts 25B, 25B in the embodiment may be connected by a timing belt instead of the relay gear 46.

  (8) In the above-described embodiment, the interlocking feeding mechanism unit group 20G and the interlocking feeding motor group 45G are provided one by one. However, a plurality of (for example, two) interlocking feeding mechanism unit groups 20G and You may make it the structure provided with the interlocking feeding motor group 45G.

1 is a front view of a spring forming machine according to an embodiment of the present invention. A perspective view of a coil spring formed by sliding a wire rod against a forming tool Cross-sectional side view of wire feeder Roller side sectional view Cross section of wire feeder Back cross-sectional view of wire feeder Cross-sectional side view of a conventional wire feeder

Explanation of symbols

20A feeding mechanism section 20G interlocking feeding mechanism section group 20S wire rod feeding device 21 roller 45 feeding motor 45G interlocking feeding motor group 45S output rotating shaft 46 relay gear 49 torque transmitting section 90 wire rod

Claims (5)

A pair of rollers arranged with a wire interposed therebetween are connected so as to be symmetrically rotatable to constitute a feeding mechanism unit, and a plurality of the feeding mechanism units are provided, and the feeding mechanism units are provided with a plurality of feeding motors. In a wire rod feeding device that feeds the wire rod driven by
A plurality of feeding mechanism sections are connected to be interlocked to form an interlocking feeding mechanism section group, and a plurality of feeding motors are connected to be interlocked to configure an interlocking feeding motor group,
A wire rod feeding device comprising one torque transmitting portion capable of transmitting torque between the interlocking feeding mechanism portion group and the interlocking feeding motor group.   2. The wire feeding according to claim 1, wherein the number of feeding motors constituting the interlocking feeding motor group is larger than the number of the feeding mechanism parts constituting the interlocking feeding mechanism portion group. apparatus.   The at least 3 or more said feeding mechanism part is provided, The clamping force of the said wire by the said pair of roller was gradually enlarged as it went ahead of the feed direction of the said wire. Wire rod feeder as described in 1.   Among the plurality of feed motors constituting the linked feed motor group, one feed motor is constituted by a first servo motor capable of position control and a second servo capable of force-controlling the remaining feed motors. The wire feeding device according to any one of claims 1 to 3, wherein the wire feeding device is constituted by a motor. The wire feeding device according to claim 1, wherein the feeding motor is an ultra-low inertia motor.

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