JP2020127690A - Workpiece feeding controller for sewing machine - Google Patents

Abstract

To enable a workpiece sewing work to be remotely operated or automated by mechanically controlling a workpiece feeding direction during sewing on a workpiece feeding controller for sewing machine.SOLUTION: A workpiece feeding controller for sewing machine comprises: a rotary plate 20, which is supported to be rotatable around a sewing needle of a sewing machine 10 on a sewing machine table 14 and allows a workpiece as a sewing target to be placed on a top face; a rotation drive mechanism 30, which drives the rotary plate 20 so that a rotation direction or a rotation speed of the rotary plate can be controlled; and a drive circuit 40, which supplies driving signals for controlling the rotation direction or the rotation speed of the rotary plate 20 to the rotation drive mechanism 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a work feed control device for a sewing machine.

Generally, when sewing a work such as cloth as a work by a sewing machine, it is not possible to perform sewing with a required sewing line unless the operator constantly controls the feed direction of the work. Patent Document 1 discloses a feeding device including a rotating plate that rotates a cloth being sewn on a side of a sewing needle of a sewing machine. In such a feeding device, by rotating the cloth being sewn by the rotating plate, the scallop stitch in which the arc-shaped seams are continuous can be applied to the cloth. Patent Document 2 discloses a device in which the position of a terminal of a cloth being sewn along a sewing needle is monitored by an optical sensor and a guide wheel controls a cloth feeding direction so that the position is an appropriate position. There is.

Microfilm of Jitsugyo Sho 59-56525 (Shokai Sho 60-168478) JP 60-17557 A

In any case, the conventional sewing work is premised on being performed manually by an operator, and it has not been possible to meet the demand for labor saving.

An object of the present invention is to enable remote control or automation of work sewing work by mechanically controlling the feed direction of a work being sewn in a sewing machine work feed control device.

A work feed control device for a sewing machine according to a first aspect of the present invention includes a rotating plate which is rotatably supported on a sewing machine table around a sewing needle of a sewing machine and on which a work as a workpiece can be placed. A rotation drive mechanism that drives the rotation plate so that its rotation direction or rotation speed is controllable, and a drive circuit that supplies a drive signal that controls the rotation direction or rotation speed of the rotation plate to the rotation drive mechanism.

In the first invention, the rotation drive mechanism and the drive circuit can control either or both of the rotation direction and the rotation speed of the rotating plate. Further, the drive circuit may be configured to generate the drive signal based on the information stored in advance, or may be configured to generate the drive signal based on the manual operation. In the latter case, it is desirable for manpower saving that the drive circuits of a plurality of work feed control devices for sewing machines are simultaneously operated by one manual operation.

According to the first aspect of the present invention, the rotation direction or the rotation speed of the rotary plate is controlled by the rotary drive mechanism and the drive circuit while the work is placed on the rotary plate that rotates around the sewing needle. Therefore, a sewing line can be formed on the work according to the rotation direction or rotation speed of the rotary plate. Therefore, by remotely controlling or automating the control of the rotating direction or the rotating speed of the rotary plate, the work of sewing the workpiece can be remotely controlled or automated. It should be noted that control of only simple feeding of the work can be easily implemented by the conventional technique.

A second invention of the present invention is the first invention according to the first invention, further comprising a work retainer for pressing the work placed on the rotary plate from above.

According to the second aspect of the present invention, the work presser for pressing the work placed on the rotary plate from above is provided. Therefore, the work can be appropriately pressed, as if the worker performs the sewing work while pressing the work.

A third invention of the present invention is the above-mentioned first or second invention, further comprising a remote controller capable of controlling a drive signal supplied to the rotary drive mechanism by the drive circuit by remote operation.

In the third invention, the remote control signal sent from the remote controller to the drive circuit may be wireless or wired. The same remote controller may be used to control the start, stop, and sewing speed of the workpiece.

According to the third aspect of the invention, the drive circuit includes a remote controller capable of controlling a drive signal supplied to the rotary drive mechanism. Therefore, the remote controller can control the rotation direction or the rotation speed of the rotary plate to perform the work sewing work by remote control.

A fourth invention of the present invention is the memory according to any one of the first to third inventions, wherein the drive circuit stores control contents of a rotation direction or a rotation speed of the rotary plate during sewing of the work with time. The drive circuit is controlled by the drive signal supplied to the rotary drive mechanism based on the control content stored in the memory.

In the fourth invention, the sewing start, stop, and sewing speed of the workpiece may be stored in the memory, and the drive circuit may also control the starting, stopping, and sewing speed of the workpiece based on the stored contents.

According to the fourth aspect of the invention, the drive circuit includes a memory that stores the control content of the rotation direction or the rotation speed of the rotating plate with the passage of time. Then, the drive circuit controls the drive signal of the rotary drive mechanism based on the control content stored in the memory. Therefore, the work of sewing the work can be automated.

FIG. 1 is a perspective view of a work feed control device for a sewing machine that is a first embodiment of the present invention. It is an enlarged plan view of a rotating plate portion of the first embodiment. It is a functional block diagram of a drive circuit portion of the first embodiment. FIG. 3 is an enlarged plan view of a work holding portion of the first embodiment. It is a perspective view of the work feed control device for sewing machines which is a 2nd embodiment of the present invention. It is an expansion perspective view of the front-end|tip part of the free arm of 2nd Embodiment.

<Overall configuration of the first embodiment>
FIG. 1 shows a feed control device for a work for a sewing machine which is a first embodiment of the present invention. This sewing machine work feed control device rotatably installs a rotary plate 20 on a sewing machine table 14 of the sewing machine 10 and controls the rotation of the rotary plate 20 to sew a sewing target placed on the rotary plate 20. It controls the feed direction and feed speed of a work (not shown) which is an object. In the following description, each direction will be described assuming that the upper surface of the sewing machine table 14 is horizontal and the sewing machine body 11 of the sewing machine 10 is arranged on the upper surface thereof.

<Structure of rotating plate 20>
As shown in detail in FIG. 2, the rotary plate 20 is rotatably supported on the inner peripheral side of an annular frame body 21. On the inner peripheral side of the frame body 21, a plurality of (here, six) slide bodies 23 are provided at equal intervals in the circumferential direction along the inner peripheral surface. A ball bearing is provided at the inner peripheral end of the sliding body 23, and the outer peripheral surface of the rotary plate 20 is guided by the ball bearing. A circular opening 20a is formed at the center of the circle of the rotary plate 20.

As shown in FIG. 1, the combination of the frame 21 and the rotary plate 20 is installed in the sewing machine 10 by fixing the frame 21 on the sewing machine table 14 of the sewing machine 10. At this time, as shown in FIGS. 1 and 2, the sewing needle 12 and the presser foot 13 of the sewing machine main body 11 are arranged at the center of the opening 20 a of the rotary plate 20. Therefore, the rotary plate 20 is rotated around the sewing needle 12.

As shown in FIGS. 1 and 2, a plurality of (here, three) ball bearings 24 are arranged on the sewing machine table 14 below the rotary plate 20 at equal intervals in the circumferential direction of the rotary plate 20. .. Therefore, the outer peripheral surface of the rotary plate 20 is guided by the ball bearing of the sliding body 23 as described above, so that the frictional resistance at the time of rotation with respect to the frame body 21 is reduced, and the lower surface is supported by the ball bearing 24. By doing so, the frictional resistance during rotation of the sewing machine table 14 is reduced.

<Structure of rotation drive mechanism 30>
As shown in FIG. 1, in the rotary drive mechanism 30, the drive roller 32 is rotatably supported on the tip of a support bracket 33, and the base end of the support bracket 33 is rotatably supported on the sewing machine table 14 by a hinge body 34. Is configured. A motor 31 is provided on the opposite side of the drive roller 32 with the plate-shaped support bracket 33 interposed therebetween, and the drive roller 32 is coupled so as to be rotationally driven by the motor 31. A drive circuit 40 that controls the motor 31 is coupled to the motor 31.

The lower side of the drive roller 32 is configured to protrude below the lower edge of the support bracket 33, and the outer peripheral surface of the drive roller 32 is in contact with the upper surface of the rotary plate 20. Since the motor 31 is coupled to the rotation shaft of the drive roller 32 and the weight of the motor 31 is added, the outer peripheral surface of the drive roller 32 is pressed against the upper surface of the rotary plate 20. As shown in FIG. 2, the drive roller 32 is arranged on the rotary plate 20 so as to correspond to one ball bearing 24. Therefore, when the drive roller 32 is rotationally driven by the motor 31, the rotary plate 20 is efficiently sandwiched between the drive roller 32 and the ball bearing 24 to efficiently receive the rotational force of the drive roller 32 to move the ball bearing 24. Rolled and rotated smoothly. The outer peripheral surface of the drive roller 32 or the upper surface of the rotary plate 20 is subjected to an appropriate surface treatment in order to secure a frictional force between them.

When the drive roller 32 is in the drive position on the rotary plate 20 and the drive roller 32 becomes an obstacle when handling a work on the rotary plate 20, the support bracket 33 is rotated about the hinge body 34, It is possible to move the drive roller 32 from the drive position where it abuts against the outer peripheral side upper surface of the rotary plate 20 to the separated position, and to retract the drive roller 32 from above the rotary plate 20.

<Structure of work clamp 50>
As shown in FIGS. 1, 2, and 4, a work retainer 50 is provided on the rotary plate 20 at a position corresponding to the periphery of the opening 20a. The work presser 50 has a support body 51 having a substantially U-shape in a plan view from above the rotating plate 20, and the support body 51 is arranged so as to wrap the tip portion of the sewing machine main body 11. The support body 51 is fixed to the front end surface of the sewing machine main body 11 by a fixing plate 51b.

A plurality of (here, seven) through-holes 51a are bored vertically on the upper surface of the rotary plate 20 in the support body 51. The through-holes 51a located at both ends and the through-holes located in the middle part. The pressing rods 52 are vertically slidably inserted into the three 51a in total. A ball bearing 52a is provided at the lower end of the presser bar 52, so that even when each presser bar 52 is placed on the work piece placed on the rotary plate 20, the work piece does not have a ball bearing 52a. Is designed to easily slide in the horizontal direction. Further, the presser bar 52 is set to have a weight capable of pressing the work on the rotary plate 20 with an appropriate pressure. For example, the presser bar 52 is made of stainless steel.

Each presser bar 52 can be inserted into and removed from each through hole 51a, so that the presser bar 52 can be inserted into an appropriate through hole 51a among the plurality of through holes 51a according to the property of the work and the like to function. Has been For example, as shown in FIGS. 1, 2 and 4, three pressing rods 52 are set for a work having a high bending rigidity, whereas a work feeding direction is set for a work having a low bending rigidity. One or two of the presser rods 52 located on the downstream side of is removed from the through hole 51a, and the work retainer 50 is constituted only by the remaining presser rods 52. Here, the presser bar 52 is inserted into and removed from the through hole 51a to control the number and position of the presser bar 52 that comes into contact with the work, but the presser bar 52 is engaged with the support body 51 at the lifted position. It may be held by holding it at a distance from the upper surface of the work.

In this way, by controlling the number and position of the pressing rods 52 that press the work according to the property of the work, for example, a work having a low bending rigidity is pushed to a position of the ball bearing 52a as compared with a work having a high bending rigidity. The pressure is likely to be concentrated, and the work clamp 50 is less likely to move due to sliding of the work. Therefore, in a work having a low bending rigidity, the number of ball bearings 52a of the work pressing member 50 is reduced as compared with a work having a high bending rigidity, so that the work pressing member 50 can easily slide with respect to the feed of the work, It is possible to prevent the stacked works from being displaced from each other during sewing when the works are stacked and sewn. Moreover, since the ball bearings 52a on the downstream side in the feed direction of the work are separated from each other, the area of the work held by the work retainer 50 can be narrowed to facilitate the direction change of the work when the feed direction changes. ..

<Structure of drive circuit 40>
FIG. 3 shows the drive circuit 40. The controller 63 and the motor 31 are connected to the drive circuit 40, and the drive circuit 40 can arbitrarily control the rotation speed and the rotation direction of the motor 31 by the speed command signal and the rotation direction command signal of the controller 63. There is. A remote controller 61 can be connected to the drive circuit 40 in parallel with the controller 63, and the motor 31 can be controlled by the remote controller 61 in the same manner as the control by the controller 63.

A memory 62 is connected to the drive circuit 40, and the memory 62 is capable of storing the control contents of the motor 31 by the controller 63 or the remote controller 61 over time. The memory 62 can control the rotation speed and the rotation direction of the motor 31 based on the stored contents. It should be noted that the memory 62 also stores information on the feed rate of the work by the sewing machine main body 11 as necessary, and the feed rate of the work can be controlled by the information as well as the rotation speed and the rotation direction of the motor 31. ..

<Operation and effect of the first embodiment>
When sewing a work to be sewn as a work, the work placed on the rotary plate 20 is clamped under the presser foot 13 as in the case of general sewing work. At this time, the work is held in a state of being held by the holding rod 52 of the work holding member 50. In this state, the sewing machine main body 11 is operated to start the sewing operation, and the drive roller 32 is rotated as necessary to form the stitch on the work into an arbitrary shape.

For example, when the stitches are straight, the driving roller 32 is rotated and the deviation of the work from the straight direction is adjusted to perform the sewing. As a result, the work is fed by the feed dog (not shown) below the presser foot 13 in the direction indicated by the arrow A in FIG. 2, and the stitch becomes a straight line. At this time, since the work is pressed by the presser bar 52 of the work presser 50, the work is stably moved straight as in the case where the worker performs the sewing work while manually pressing the work.

When the seam is curved to the left, the drive roller 32 is rotated to rotate the rotary plate 20 counterclockwise in FIG. As a result, the work is rotated counterclockwise together with the rotary plate 20 while being fed by the feed dog, so that the work is fed in the direction indicated by the arrow B in FIG. Therefore, a curved seam is formed on the left side of the work.

When the seam is curved to the right, the drive roller 32 is rotated and the rotary plate 20 is rotated clockwise in FIG. As a result, the work is rotated in the clockwise direction together with the rotary plate 20 while being fed by the feed dog, so that the work is fed in the direction indicated by the arrow C in FIG. Therefore, a curved seam is formed on the right side of the work.

By changing the combination of the rotation of the rotary plate 20 by the drive roller 32 and the feed speed of the work by the feed dog, it is possible to form a curved seam having an arbitrary curvature. In addition, by changing the rotation direction and the rotation speed of the rotary plate 20 by the drive roller 32 during the sewing operation, it is possible to form a seam in which the bending direction and the curvature are arbitrarily changed.

Moreover, these sewing operations can be performed not only by the controller 63 but also by the remote controller 61. If one remote controller 61 can control the drive circuits 40 of a plurality of sewing machines 10, one operator can perform the sewing operation. Can simultaneously perform the sewing work of a plurality of works by using a plurality of sewing machines 10.

Further, if the drive circuit 40 is controlled by the memory 62, the sewing work can be automated.

<Second Embodiment>
FIG. 5 shows a second embodiment of the present invention. The feature of the second embodiment over the first embodiment is that the structure of the work clamp 50 is changed. The other configurations are the same as those in the first embodiment also in the second embodiment, and the repeated description of the same parts will be omitted.

As shown in an enlarged view in FIG. 6, the work presser 50 of the second embodiment is configured such that a presser slider 53 is provided on a piston rod 57b of a piston (not shown) inserted in a cylinder 57a. The presser slider 53 is provided with a plurality of (here, four) ball bearings 53a in a portion in contact with the work placed on the rotary plate 20, and the work is easily attached to the presser slider 53. It is slidable.

An air pipe 58 and an exhaust port 57c are connected to the cylinder 57a. When compressed air is supplied to the cylinder 57a through the air pipe 58, the piston rod 57b is stored in the cylinder 57a. When the exhaust valve 57d connected to the exhaust port 57c is opened while the supply of compressed air from the air pipe 58 is cut off, the piston rod 57b is operated to project from the cylinder 57a.

The cylinder 57 a is connected to the free arm 56 by a support 57 e, and the free arm 56 is supported by a support rod 55. The support rod 55 is erected vertically on the frame body 21 on the outer periphery of the rotary plate 20. In the free arm 56, a plurality (here, three) of rods 56a to 56c are connected by a plurality of (here, four) connecting bodies 56e to 56h. Further, the rod 56a is connected to the support 57e by a connecting body 56d. Furthermore, a rod 56c is also connected to the support rod 55 by a connecting body 56j.

The binders 56e and 56f are horizontally rotatably coupled to each other, and the binders 56g and 56h are also horizontally rotatably coupled to each other. The binder 56j is rotatably connected to the support rod 55 in the horizontal direction. Therefore, the relative angles of the rods 56a to 56c of the universal arm 56 can be freely changed in the horizontal direction, and the position of the work holder 50 on the rotating plate 20 can be freely changed.

As shown in FIGS. 5 and 6, a weight 54 is fixed on the cylinder 57a. The weight 54 is formed by stacking a plurality of disc bodies, and the weight can be controlled by controlling the number of disc bodies. The weight 54 is configured such that the pressing force applied to the work by the pressing slider 53 becomes an appropriate amount.

According to the second embodiment, the work presser 50 is placed on the work placed on the rotary plate 20, and the work is appropriately pressed in the same manner as the operator's hand presses the work during sewing work. You can When the work is fed on the rotary plate 20 during sewing, the presser slider 53 can slide on the work. When the presser slider 53 is separated from the work for attaching and detaching the work, the press slider 53 is lifted by supplying compressed air from the air pipe 58 to the cylinder 57a, and the work of attaching and detaching the work can be facilitated. Further, the position of the work clamp 50 on the rotary plate 20 can be appropriately changed by adjusting the angle of the free arm 56 according to the shape of the work.

<Other embodiments>
The specific embodiments have been described above, but the present invention is not limited to their appearance and configuration, and various changes, additions, and deletions are possible. For example, in the above embodiment, the rotation drive mechanism 30 can control both the rotation direction and the rotation speed of the rotary plate 20, but it is also possible to control only one of the rotation direction and the rotation speed. Further, in the above-described embodiment, the rotary drive mechanism 30 is configured to drive the rotary plate 20 of the rotary plate 20 to rotate by the driving roller 32 by frictional force. However, the gear rotated by the motor 31 is provided on the outer periphery of the rotary plate 20. The gear may be meshed with the formed gear so as to be rotationally driven.

10 sewing machine 11 sewing machine main body 12 sewing needle 13 presser foot 14 sewing machine table 20 rotating plate 20a opening 21 frame 23 sliding body 24 ball bearing 30 rotary drive mechanism 31 motor 32 drive roller 33 support bracket 34 hinge body 40 drive circuit 50 work clamp 51 Support 51a Through hole 51b Fixed plate 52 Presser bar 52a Ball bearing 53 Presser slider 53a Ball bearing 54 Weight 55 Support bar 56 Universal arm 56a to 56c Rod 56d to 56j Joint 57a Cylinder 57b Piston rod 57c Exhaust port 57d Exhaust valve 57e Support 58 Air pipe 61 Remote controller 62 Memory 63 Controller

Claims (4)

A rotating plate that is rotatably supported on the sewing machine table with the sewing needle of the sewing machine as a center, and that allows a work as a workpiece to be placed on the upper surface.
A rotary drive mechanism that drives the rotary plate so that its rotation direction or speed can be controlled;
A drive circuit for supplying a drive signal for controlling a rotation direction or a rotation speed of the rotary plate to the rotary drive mechanism. In claim 1,
A work feed control device for a sewing machine, comprising a work retainer for pressing a work placed on the rotary plate from above. In claim 1 or 2,
A work feed control device for a sewing machine, comprising a remote controller capable of remotely controlling a drive signal supplied from the drive circuit to the rotary drive mechanism. In any one of Claims 1-3,
The drive circuit includes a memory that stores the control content of the rotation direction or the rotation speed of the rotary plate during sewing of the workpiece with the passage of time,
The work feed control device for a sewing machine, wherein the drive circuit controls a drive signal to be supplied to the rotary drive mechanism based on the control content stored in the memory.

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