JP7172691B2 - Work feed controller for sewing machine - Google Patents

Description

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

In general, when sewing a work such as cloth as a material to be sewn by a sewing machine, sewing with a desired sewing line cannot be performed unless the operator constantly controls the feeding direction of the work. Japanese Laid-Open Patent Publication No. 2004-100000 discloses a feeding device provided with a rotating plate for rotating a cloth being sewn on the side of a sewing needle of a sewing machine. In such a feeding device, the fabric being sewn is rotated by a rotating plate, so that scallop stitches, in which arc-shaped stitches are continuous, can be applied to the fabric. Japanese Patent Laid-Open No. 2002-200000 discloses a device that monitors the end position of the cloth being sewn along the sewing needle with an optical sensor, and controls the feed direction of the cloth with a guide wheel so that the position is at an appropriate position. there is

Microfilm of Japanese Utility Model Application No. 59-56525 (Japanese Utility Model Application No. 60-168478) Japanese Patent Publication No. 60-17557

In any case, the conventional sewing work is based on the premise that it is manually performed by the operator, and has not been able to meet the demand for labor saving.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a work feed control device for a sewing machine that mechanically controls the feed direction of a work being sewn, thereby enabling remote control or automation of work sewing work.

A work feed control device for a sewing machine according to a first aspect of the present invention comprises a rotary plate rotatably supported on a sewing machine table about a sewing needle of the sewing machine and having a top surface on which a work to be sewn can be placed; A rotary drive mechanism for driving the rotary plate in a controllable direction or speed; and a drive circuit for supplying a drive signal for controlling the direction or speed of rotation of the rotary plate to the rotary drive mechanism.

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

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

According to a second aspect of the present invention, in the above-described first aspect, a workpiece presser is provided to press the workpiece placed on the rotating plate from above.

According to the second aspect of the invention, there is provided a work presser that presses the work placed on the rotating plate from above. Therefore, it is possible to appropriately hold down the work in the same way as the operator performs sewing work while holding down the work.

According to a third aspect of the present invention, in the first or second aspect of the invention, a remote controller is provided which enables remote control of the drive signal supplied from the drive circuit to the rotation drive mechanism.

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

According to the third invention, a remote controller is provided that can control the drive signal supplied to the rotation drive mechanism by the drive circuit. Therefore, the sewing work of the work can be performed by remote control by controlling the rotation direction or the rotation speed of the rotating plate by the remote controller.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the drive circuit has a memory for storing, with the lapse of time, the control details of the rotation direction or rotation speed of the rotary plate during sewing of the workpiece. and the drive circuit controls a drive signal to be supplied to the rotation drive mechanism based on the control contents stored in the memory.

In the fourth invention, the memory may also store the sewing start, stop, and sewing speed of the work, and the drive circuit may control the sewing start, stop, and sewing speed of the work based on the stored contents.

According to the fourth aspect of the invention, the drive circuit includes a memory that stores the control details of the rotation direction or rotation speed of the rotor plate over time. The drive circuit then controls the drive signal for the rotation drive mechanism based on the control content stored in the memory. Therefore, the work sewing work can be automated.

1 is a perspective view of a sewing machine work feed control device according to a first embodiment of the present invention; FIG. It is an enlarged plan view of the rotating plate portion of the first embodiment. 3 is a functional block diagram of a drive circuit portion of the first embodiment; FIG. FIG. 4 is an enlarged plan view of a work holding portion of the first embodiment; FIG. 7 is a perspective view of a sewing machine work feed control device according to a second embodiment of the present invention; It is an expansion perspective view of the front-end|tip part of the flexible arm of 2nd Embodiment.

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

<Configuration of Rotating Plate 20>
As shown in detail in FIG. 2, the rotating plate 20 is rotatably supported on the inner peripheral side of an annular frame 21 . A plurality of (six in this case) sliding bodies 23 are provided along the inner peripheral surface of the frame 21 at regular intervals in the circumferential direction. A ball bearing is provided at the inner peripheral end of the sliding member 23, and the outer peripheral surface of the rotating plate 20 is guided by this ball bearing. A circular opening 20a is formed in the center of the circle of the rotating plate 20 .

As shown in FIG. 1 , the combination of the frame 21 and the rotating plate 20 is installed in the sewing machine 10 by fixing the frame 21 on the sewing 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 body 11 are arranged in the center of the opening 20a of the rotary plate 20. As shown in FIGS. Accordingly, the rotating 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 at equal intervals in the circumferential direction of the rotary plate 20 on the sewing machine table 14 below the rotary plate 20 . . Therefore, the rotary plate 20 has its outer peripheral surface guided by the ball bearings of the sliding member 23 as described above, thereby reducing the frictional resistance during rotation with respect to the frame 21, and the lower surface thereof being supported by the ball bearings 24. As a result, frictional resistance during rotation with respect to the sewing table 14 is reduced.

<Structure of Rotation Drive Mechanism 30>
As shown in FIG. 1, the rotary drive mechanism 30 has a drive roller 32 rotatably supported at the tip of a support bracket 33 , and a base end of the support bracket 33 rotatably supported on the sewing table 14 by a hinge 34 . configured as follows. A motor 31 is provided on the opposite side of the drive roller 32 with the plate-like 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 for controlling the motor 31 is coupled to the motor 31 .

The lower side of the drive roller 32 protrudes 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 applied, 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 driving roller 32 is arranged on the rotating plate 20 so as to correspond to one ball bearing 24 . Therefore, when the driving roller 32 is rotationally driven by the motor 31 , the rotary plate 20 is sandwiched between the driving roller 32 and the ball bearings 24 , and receives the rotational force of the driving roller 32 efficiently to support the ball bearings 24 . It rolls and rotates smoothly. The outer peripheral surface of the drive roller 32 or the upper surface of the rotary plate 20 is subjected to appropriate surface treatment to ensure the frictional force therebetween.

If the driving roller 32 is at the driving position on the rotating plate 20 and becomes an obstacle when the work is handled on the rotating plate 20, the support bracket 33 can be rotated about the hinge body 34 to The driving roller 32 can be moved from the driving position in contact with the upper surface of the outer peripheral side of the rotating plate 20 to the separated position, and the driving roller 32 can be retracted from the rotating plate 20 .

<Structure of work holder 50>
As shown in FIGS. 1, 2, and 4, a workpiece retainer 50 is provided on the rotating plate 20 at a position corresponding to the periphery of the opening 20a. The work presser 50 has a substantially U-shaped support 51 when viewed from above the rotary plate 20 , and the support 51 is arranged to cover the leading end of the sewing machine body 11 . The support 51 is fixed to the front end surface of the sewing machine body 11 by a fixing plate 51b.

A plurality of (here, seven) through-holes 51a are formed in the support 51 perpendicularly to the upper surface of the rotary plate 20. Through-holes 51a are located at both ends and through-holes 51a are located in the middle. A presser bar 52 is inserted into a total of three 51a so as to be slidable in the vertical direction. 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 workpiece placed on the rotating plate 20, the workpiece is held against the presser bar 52 by the ball bearing 52a. is made to slide easily in the horizontal direction. Also, the weight of the presser bar 52 is set to a weight that can press the workpiece onto the rotating plate 20 with an appropriate pressure. For example, the presser bar 52 is made of stainless steel.

Each presser bar 52 is removable from each through-hole 51a, and functions by inserting the presser bar 52 into an appropriate through-hole 51a among the plurality of through-holes 51a according to the properties of the workpiece. has been For example, as shown in FIGS. 1, 2, and 4, three presser bars 52 are set for a work with high bending rigidity, while for a work with low bending rigidity, the feed direction of the work is One or two of the presser bars 52 located on the downstream side of the are removed from the through holes 51a, and the work presser 50 is constituted by the remaining presser bars 52 alone. Here, the number and position of the presser bars 52 in contact with the workpiece are controlled by inserting and withdrawing the presser bars 52 from the through holes 51a. It may also be held by the user and spaced apart from the upper surface of the work.

By controlling the number and position of the presser bars 52 that press the work in accordance with the properties of the work, for example, a work with weak bending rigidity can be pushed to the position of the ball bearing 52a compared to a work with high bending rigidity. The pressure tends to concentrate, and the work presser 50 slides and becomes difficult to move with respect to the feed of the work. Therefore, in the case of a work with weak bending rigidity, the number of ball bearings 52a of the work holder 50 is reduced compared to a work with high bending rigidity, thereby making it easier to slide the work holder 50 against the feeding of the work. It is possible to prevent the overlapped works from being displaced from each other during sewing. Moreover, since the ball bearing 52a on the downstream side in the work feed direction is spaced apart, it is possible to narrow the area of the work held down by the work presser 50 and facilitate the direction change of the work when the feed direction changes. .

<Configuration of drive circuit 40>
A drive circuit 40 is shown in FIG. A controller 63 and a motor 31 are connected to the drive circuit 40, and the drive circuit 40 can arbitrarily control the rotation speed and rotation direction of the motor 31 according to the speed command signal and 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 controller 63 .

A memory 62 is connected to the drive circuit 40, and the memory 62 can store the control contents of the motor 31 by the controller 63 or the remote controller 61 over time. Further, the memory 62 can control the rotation speed and rotation direction of the motor 31 based on the stored contents. The memory 62 can also store information on the work feed speed of the sewing machine main body 11 as needed, so that the speed and direction of rotation of the motor 31 as well as the work feed speed can be controlled based on this information. .

<Actions and effects of the first embodiment>
When sewing an object to be sewn as a work, the work is placed on the rotating plate 20 and sandwiched under the presser foot 13 as in the case of general sewing work. At this time, the work is held down by the presser bar 52 of the work presser 50 . In this state, the sewing machine main body 11 is operated to start the sewing work, and the driving roller 32 is rotated as necessary to make the stitches on the work piece into an arbitrary shape.

For example, when the seams are to be straight, sewing is performed by rotating the driving roller 32 to adjust the deviation of the workpiece in the direction deviating from the straight direction. As a result, the work is fed by the feed dog (not shown) under the presser foot 13 in the direction indicated by the arrow A in FIG. 2, and the seams are straight. At this time, the work is held down by the presser bar 52 of the work presser 50, so that the work moves stably straight ahead in the same manner as when the worker performs the sewing operation while holding down the work by hand.

If the seams are 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 rotating plate 20 while being fed by the feed dog, so that the work is fed in the direction indicated by arrow B in FIG. As a result, a seam curved to the left is formed on the work.

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

By changing the combination of the rotation of the rotary plate 20 by the drive roller 32 and the speed at which the work is fed by the feed dog, it is possible to form stitches with arbitrary curvature. In addition, by changing the rotation direction and rotation speed of the rotary plate 20 by the drive roller 32 during the sewing operation, it is possible to form stitches in which the bending direction and 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 the driving circuits 40 of a plurality of sewing machines 10 can be controlled by one remote controller 61, one operator can A plurality of sewing machines 10 can be used at the same time to sew a plurality of works at once.

Further, by controlling the drive circuit 40 with the memory 62, the sewing work can be automated.

<Second embodiment>
FIG. 5 shows a second embodiment of the invention. A feature of the second embodiment as compared with the first embodiment is that the structure of the work retainer 50 is changed. Other configurations of the second embodiment are the same as those of the first embodiment, and the repetitive description of the same parts will be omitted.

As shown in an enlarged view in FIG. 6, a work presser 50 of the second embodiment is constructed by providing a presser slider 53 on a piston rod 57b of a piston (not shown) inserted into a cylinder 57a. The pressing slider 53 is provided with a plurality of (here, four) ball bearings 53a in a portion that contacts the work placed on the rotary plate 20, so that the workpiece can be easily moved against the pressing slider 53. It is made 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 retracted 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 protruded from the cylinder 57a.

The cylinder 57a is connected to a universal arm 56 by a support 57e, and the universal arm 56 is supported by a support rod 55. As shown in FIG. The support rod 55 is erected vertically on the outer peripheral frame 21 of the rotary plate 20 . The flexible arm 56 includes a plurality of (three in this case) rods 56a to 56c connected by a plurality of (four in this case) connecting bodies 56e to 56h. Further, the rod 56a is connected to the support 57e by a connector 56d. Furthermore, the rod 56c is also connected to the support rod 55 by a connecting member 56j.

The connecting bodies 56e and 56f are connected so as to be relatively rotatable in the horizontal direction, and the connecting bodies 56g and 56h are similarly connected so as to be relatively rotatable in the horizontal direction. The connection body 56j is horizontally rotatably connected to the support rod 55. As shown in FIG. 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 presser 50 on the rotary 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 discs, and the weight can be controlled by controlling the number of discs. The weight 54 allows the pressing force of the pressing slider 53 against the workpiece to be moderate.

According to the second embodiment, the workpiece presser 50 is placed on the workpiece placed on the rotary plate 20 to appropriately press the workpiece in the same manner as the operator's hand presses the workpiece during sewing work. can be done. When the work is sent on the rotating plate 20 during sewing, the presser slider 53 can slide on the work. When the pressing slider 53 is to be separated from the work for mounting or removing the work, the pressing slider 53 is lifted by supplying compressed air from the air pipe 58 to the cylinder 57a, thereby facilitating the mounting and demounting of the work. In addition, the position of the work retainer 50 on the rotating plate 20 can be appropriately changed by adjusting the angle of the free arm 56 according to the shape of the work.

<Other embodiments>
Although specific embodiments have been described above, the present invention is not limited to those appearances and configurations, and various modifications, additions, and deletions are possible. For example, in the above embodiment, both the rotation direction and the rotation speed of the rotary plate 20 can be controlled by the rotation drive mechanism 30, but only one of the rotation direction and the rotation speed may be controlled. In the above-described embodiment, the rotary drive mechanism 30 rotates the rotary plate 20 of the rotary plate 20 by the drive roller 32 by frictional force. You may make it mesh with the formed gear and it may be made to rotate.

10 Sewing machine 11 Sewing machine body 12 Sewing needle 13 Presser foot 14 Sewing machine table 20 Rotary plate 20a Opening 21 Frame body 23 Sliding body 24 Ball bearing 30 Rotation drive mechanism 31 Motor 32 Drive roller 33 Support bracket 34 Hinge body 40 Drive circuit 50 Work presser 51 Support body 51a Through hole 51b Fixed plate 52 Presser bar 52a Ball bearing 53 Presser slider 53a Ball bearing 54 Weight 55 Supporting bar 56 Flexible arms 56a to 56c Rods 56d to 56j Connector 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 feed dog for linearly moving a work as a sewing object in a predetermined direction on a sewing machine table in accordance with the sewing operation of the sewing needle;
A sewing machine comprising: a presser foot that presses the work onto a sewing machine table during a sewing operation by the sewing needle and holds the work between itself and the feed dog when the work is moved by the feed dog,
An opening is provided at the center of rotation for arranging the sewing needle, the presser foot, and the feed dog, and the sewing machine is rotatably supported on the sewing machine table around the sewing needle, and the workpiece is placed on the upper surface. a rotating plate rotated by
a rotation drive mechanism for driving the rotary plate together with the work on the sewing machine table so that the direction or speed of rotation thereof can be controlled;
a driving circuit that supplies a driving signal for controlling the rotation direction or rotation speed of the rotating plate to the rotation driving mechanism ;
A work feed control device for a sewing machine, wherein the rotary drive mechanism is movable between a drive position for driving the rotary plate and a spaced position retracted from the rotary plate . In claim 1,
A work presser is provided to sandwich the work placed on the rotating plate between itself and the rotating plate and press the work from above ,
A work feed control device for a sewing machine, wherein the work presser is slidable on the surface of the work so as not to interfere with the movement of the work moving together with the rotary plate . 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 rotation drive mechanism. In any one of claims 1 to 3,
The drive circuit includes a memory for storing, with time, control details of the rotation direction or rotation speed of the rotary plate during sewing of the workpiece,
A work feed control device for a sewing machine, wherein the drive circuit controls a drive signal supplied to the rotation drive mechanism based on the control contents stored in the memory.

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