JP5160270B2 - Sewing machine holding device - Google Patents

Description

  The present invention relates to a sewing machine pressing device.

There is a sewing machine that can perform pattern sewing such as embroidery by moving the needle up and down while moving the cloth as a sewing object along the upper surface of the sewing machine table while being held by a holding frame (for example, Patent Documents). 1).
In the presser device provided in such a sewing machine, as shown in FIG. 6, a feed base 102 that can be moved along the upper surface of the sewing machine bed 101 by a pulse motor or the like, and a lift that can be raised and lowered to the feed base 102. A pressing arm 103 provided, a pressing arm 104 provided on the pressing arm 103 and pressing the cloth from above by lowering the pressing arm 103; a lower plate 105 that holds the cloth between the pressing 104; And a driving device 106 that raises and lowers the pressing arm 103 so as to move up and down between a standby position retracted from the cloth and a holding position for holding the cloth.
Then, the drive device 106 composed of an air cylinder or the like maintains the state where the presser 104 stands by at the standby position when not sewing, and the presser 104 descends to the holding position and presses the cloth when sewing. Accordingly, the desired stitch pattern is formed by intermittently moving the cloth in synchronization with the vertical movement of the sewing needle.

By the way, in recent years, with the increase in the size of the presser and the increase in the sewing speed, in the cloth feeding operation that repeatedly moves and stops intermittently for each stitch, the feed base, presser arm 103, The presser 104 and the lower plate 105 are vibrated in a direction opposite to the feed direction (so-called damping), and there is a problem that the sewing position is not determined and the sewing quality is deteriorated. This damping can be suppressed by slowing down slowly when stopping. As a technique for preventing this damping, as shown in FIG. 7, a plate-like pressing plate 108 is provided on the lower surface of the sewing machine arm 107 erected on the upper surface of the sewing machine bed 101, and the feed plate 102 is provided by the pressing plate 108. There is something that presses down from above.
JP 2007-244774 A

Here, since the press plate is fixed to the sewing machine frame, it is formed in a size that covers the entire range of movement of the feed base so that it can be pressed from above to prevent damping regardless of the position of the feed base. Has been. For this reason, there is a problem that when the cloth is set between the presser and the lower plate, the presser plate becomes an obstacle and workability is lowered. In addition, there is a problem that it is difficult to maintain the parts provided below the pressing plate.
On the other hand, it is also conceivable to increase the rigidity of the entire sewing machine to prevent dumping and to eliminate the need for a pressing plate. However, the presser plate also functions as a protective plate for preventing an operator from accidentally pinching the hand between the feed table and the sewing machine arm when the feed table is moved. For this reason, it is not preferable to simply remove the holding plate without taking other measures.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a sewing machine presser that can improve the workability of cloth setting and parts maintenance without neglecting the safety measures of the sewing machine. The purpose is to do.

According to the first aspect of the present invention, there is provided a feed base (10) which is movable in two orthogonal directions along the upper surface of the sewing machine bed (2) on which the sewing machine arm (3) is erected, and the feed base (10). ) A presser arm (20) provided to be movable up and down, and a presser (30) provided on the presser arm (20) to press the workpiece (C) from above by lowering the presser arm (20), The presser arm (20) is moved up and down between a standby position (P1) where the presser (30) is retracted from the sewing product (C) and a holding position (P2) for holding the sewing product (C). In a presser device (100) for a sewing machine comprising a drive device (50) that moves up and down, the feed base (10) includes a base end portion (10a) erected on the sewing machine bed (2), and the drive Disposed above the device (50) and And a parallel upper surface to the upper surface of the Nbeddo (2),
It is fixed to the upper end surface of the feed base (10) close to the lower surface of the sewing machine arm (3), and is disposed along the moving plane of the feed base (10), and the feed base (10) is moved within the movement range. A plate-like feed cover (60) formed so as to overlap with the sewing machine arm (3) below the sewing machine arm (3) regardless of where it is moved is provided.

According to the first aspect of the present invention, the feed cover overlaps with the sewing machine arm below the sewing machine arm even if the feed base is moved to any location within the moving range. Therefore, there is no gap between the sewing machine arm and the feed cover when the sewing machine is viewed from above. Thereby, the feed cover also functions as a protective plate for preventing an operator from accidentally pinching the hand between the feed base and the sewing machine arm when the feed base is moved.
Further, since the feed cover is provided not on the sewing machine arm but on the feed base, it is not necessary to provide the feed cover over the entire movement range of the feed base, so the feed cover can be reduced in size, The workability of parts maintenance can be improved. In addition, the weight of the sewing machine pressing device can be reduced.
Further, since the feed cover is provided on the feed base, vibration due to the operation of the needle, the drive of the sewing machine motor, or the like is not transmitted from the sewing machine arm, so that the function of the pressing device can be fully exhibited.

  According to a second aspect of the present invention, in the presser device for a sewing machine according to the first aspect, the feed cover (60) is made of a transparent material.

  According to the second aspect of the present invention, since the feed base and other parts covered by the feed cover are normally invisible, it is not possible to find a faulty part or confirm the installation. By forming the feed cover from a transparent material, the parts covered by the feed cover can be visually recognized.

According to the first aspect of the present invention, the feed cover overlaps with the sewing machine arm below the sewing machine arm even if the feed base is moved to any location within the moving range. Therefore, there is no gap between the sewing machine arm and the feed cover when the sewing machine is viewed from above. Thereby, the feed cover also functions as a protective plate for preventing an operator from accidentally pinching the hand between the feed base and the sewing machine arm when the feed base is moved.
Further, since the feed cover is provided not on the sewing machine arm but on the feed base, it is not necessary to provide the feed cover over the entire movement range of the feed base, so the feed cover can be reduced in size, The workability of parts maintenance can be improved. In addition, the weight of the sewing machine pressing device can be reduced.
Further, since the feed cover is provided on the feed base, vibration due to the operation of the needle, the drive of the sewing machine motor, or the like is not transmitted from the sewing machine arm, so that the function of the pressing device can be fully exhibited.

  According to the second aspect of the present invention, since the feed base and other parts covered by the feed cover are normally invisible, it is not possible to find a faulty part or confirm the installation. By forming the feed cover from a transparent material, the parts covered by the feed cover can be visually recognized.

  The best mode of a sewing machine presser according to the present invention will be described below in detail with reference to the drawings. In the embodiment, the direction of each part is determined based on the XYZ axes shown in the drawings. Here, in a state where the sewing machine is installed on a horizontal plane, the Z-axis direction indicates a vertical direction that is a vertical direction, the Y-axis direction indicates a left-right direction that coincides with the longitudinal direction of an arm unit (not shown), and the X-axis direction is horizontal and The front-rear direction perpendicular to the Y-axis direction is shown.

<Configuration of sewing machine presser>
As shown in FIG. 1 to FIG. 4, the sewing machine presser 1 is an electronic device that, for example, performs embroidery sewing by moving a cloth C as a sewing object along the upper surface of the sewing machine bed based on sewing data prepared in advance. The cycle sewing machine 100 is provided.
The sewing machine 100 includes a presser device 1, a sewing machine bed 2, and a sewing machine arm 3 erected on the upper surface of the sewing machine bed 2. The sewing machine arm 3 is formed so as to extend upward on the upper surface of the sewing machine bed 2 and to extend along the surface direction of the upper surface of the sewing machine bed 2 from the upper part of the vertical drum part 3a. Arm portion 3b. Therefore, the sewing machine 100 is formed in a substantially U shape when viewed from the front.
The presser device 1 is provided on the upper surface of the sewing machine bed 2 and is configured to pass under the arm portion 3b. In the present embodiment, the sewing operation by the operator of the sewing machine 100 is performed on the surface side of the sewing machine, which is the tip of the arm 3b.

  As shown in FIGS. 1 to 4, the presser device 1 is provided with a feed base 10 that is movable along the upper surface of the sewing machine bed 2 on which the sewing machine arm 3 is erected, and a feed base 10 that is movable up and down. A presser arm 20 and a presser arm 30 provided on the presser arm 20 and pressing the cloth C to be sewn from above by the lowering of the presser arm 20 and one end connected to the lower part of the feed base 10 and the other end of the presser 30 A lower plate 40 that holds the cloth C by being clamped by the presser 30 that extends downward and descends to the holding position P2, and a holding position P2 that holds the cloth C while the presser 30 retracts from the cloth C. And a cylinder device 50 as a drive device that raises and lowers the pressing arm 20 so as to move up and down, and a feed cover 60 provided on the upper surface of the feed base 10.

(Feed stand)
As shown in FIGS. 1 to 4, the feed base 10 has a base end portion 10 a erected on the sewing machine bed 2. The feed base 10 has a height at which the tip end portion 10b can pass between the lower surface of the arm portion 3b and the upper surface of the sewing machine bed 2, and is particularly disposed close to the lower surface of the sewing machine arm 3. The gap between the lower surface and the feed base 10 is arranged so that an operator's finger does not enter. The tip 10b of the feed base 10 has a shape extending to the vicinity of a sewing needle (not shown) that moves up and down at the tip of the arm 3b and an intermediate presser. The upper end surface of the feed base 10 is formed to be a plane parallel to the upper surface of the sewing machine bed 2 so that the feed cover 60 can be attached.
The feed base 10 is driven by an X-axis pulse motor and a Y-axis pulse motor (not shown) provided in the sewing machine bed 2 and can move freely in the X and Y directions on the sewing machine bed 2. The X-axis pulse motor and the Y-axis pulse motor respectively apply a moving force in the X and Y directions to the feed base 10 through a gear mechanism, a drive shaft, a timing belt, a guide rail, and the like (not shown). Note that the drive amount and drive timing of each pulse motor are driven and controlled independently from a sewing machine motor (not shown), which is a drive source for needle up and down movement, by a control device (not shown) in the present embodiment. .
Further, the movement range R (see FIG. 5) of the feed base 10 is determined by a stopper provided in the sewing machine bed 2 that restricts movement in the X direction and the Y direction.

(Holding arm)
As shown in FIGS. 1 to 4, the pressing arm 20 has a base end portion 20 a connected to a distal end portion 10 b of the feed base 10 so as to be movable up and down and detachable along the vertical direction (Z-axis direction). The front end portion 20b of the presser arm 20 is divided into two forks and extends in parallel to the surface portion side of the sewing machine 100, and is an arm member having a substantially U shape in plan view. The pressing arm 20 is driven up and down while the two tip portions 20b are maintained in a horizontal state in accordance with the driving of the cylinder device 50 (see FIG. 4). Further, the pressing arm 20 can be exchanged for various sizes according to the size of the cloth C to be sewn.

(Press)
As shown in FIGS. 2 and 3, the presser 30 is a rectangular frame having an opening 30 a penetrating in the vertical direction, and the insides of the four sides are greatly opened. The presser 30 is connected to the two tip portions 20b of the presser arm 20 in the middle between one end and the other end of two sides parallel to the Y-axis direction. Further, the presser 30 can be exchanged for various sizes according to the size of the cloth C to be sewn. The presser 30 moves up or down integrally with the presser arm 20 when the presser arm 20 moves up and down according to the drive of the cylinder device 50. When the cloth C is lowered, the cloth C placed on the lower plate 40 is disposed at a holding position P2 for pressing from above, and the cloth C held in cooperation with the lower plate 40 is held along the upper surface of the sewing machine bed 2. Move in the XY direction.

  That is, the presser 30 holds the cloth C and moves the held cloth C in the front-rear and left-right directions (XY directions) together with the presser 30 as the X-axis pulse motor and the Y-axis pulse motor are driven. The movement of the presser 30 and the operation of a sewing needle and a hook (not shown) are interlocked to cause needle drop on the cloth C held inside the opening 30a, and a stitch pattern based on predetermined sewing data. Is formed. Here, the predetermined sewing data refers to, for example, data relating to XY coordinate data, feed pitch, etc. of all needle drop points set for each stitch in advance in order to form various patterns. Are stored in a storage device (ROM or the like) of an unillustrated control device or an external storage device (external memory) in this embodiment.

(Lower plate)
As shown in FIGS. 1 to 4, the base plate (rear end) portion 40 a of the lower plate 40 is connected to the lower part on the front side of the base end portion 10 a of the feed base 10, and the tip side is the sewing bed 2. It extends to the front side of the sewing machine bed 2 along the upper surface. The front end side of the lower plate 40 is formed in a rectangular frame shape that is substantially the same shape as the front end of the presser 30, has an opening 40 b, and is disposed so as to face the presser 30 from below. And the cloth C is hold | maintained by clamping the cloth C mounted so that the opening part 40b may be covered with the holding | suppressing 30, and the needle drop by a sewing needle is performed in the opening part 40b.

(Cylinder device)
As shown in FIGS. 2 and 3, the cylinder device 50 is arranged on both sides of the feed base 10 and is composed of a pair of air cylinders that use air as a fluid. Such an air cylinder includes a cylinder attached to the feed base 10, a piston rod that advances and retreats in response to depression of a depression pedal (not shown), and a solenoid valve for adjusting the amount of air supplied into the cylinder. A well-known configuration is adopted. Then, as shown in FIG. 4, the cylinder device 50 raises and lowers the presser 30 between a holding position P2 that descends and presses the cloth C from above and a standby position P1 that is retracted upward and disposed at the upper position. .

(Feed cover)
The feed cover 60 is fixed to the upper end surface of the feed base 10 as shown in FIGS. 1 and 5.
The feed cover 60 is formed in a plate shape, and is arranged such that the upper surface of the feed cover 60 and the upper surface of the sewing machine bed 2 are substantially parallel when attached to the feed base 10.
As shown in FIG. 5, the feed cover 60 is located below the arm portion 3 b of the sewing machine arm 3 even when the feed base 10 is moved to any position within the movement range R on the upper surface of the sewing machine bed 2. It is formed in a size that overlaps with the arm portion 3b. In other words, even when the feed base 10 is moved to the maximum in the X direction of the sewing machine bed 2 farthest from the arm portion 3b, a size such that a part of the feed cover 60 is located below the arm portion 3b. Is formed.
That is, no matter where the feed base 10 is moved, when the sewing machine 100 is viewed in plan, the feed cover 60 does not escape from below the arm portion 3b, and between the feed cover 60 and the side surface of the arm portion 3b. There are no gaps.
Here, the feed cover 60 is preferably formed of resin or the like rather than metal from the viewpoint of weight reduction of the pressing device 1. Moreover, it is preferable to form from a transparent material like an acrylic board so that each part of the feed stand 10 can be visually recognized even if it is covered with the feed cover 60. As a result, when an abnormality or the like occurs in the feed base 10 covered by the feed cover 60 or its surrounding parts, it can be found without removing the feed cover 60.

<Operation of holding device>
When holding the cloth C by the pressing device 1 and performing pattern sewing such as embroidery stitching, the cloth C is placed on the lower plate 40, the cylinder device 50 is driven to lower the pressing arm 20, The presser 30 is lowered from the standby position P1 to the holding position P2. The cloth C is held between the presser 30 and the lower plate 40 by the lowering of the presser 30. At this time, the region of the cloth C exposed in the opening 30a of the presser 30 is a region to be sewn.
Then, the control device drives the X-axis pulse motor and the Y-axis pulse motor to move the held cloth C together with the presser 30 in the front-rear and left-right directions (XY directions). The movement of the presser 30 and the operation of a sewing needle and a hook (not shown) are interlocked so that the needle C is dropped on the cloth C held inside the opening 30a, and a stitch pattern based on predetermined sewing data is formed. Is done.

<Effect>
As described above, according to the presser device 1 of the sewing machine according to the present embodiment, the feed cover 60 is located below the arm portion 3b of the sewing machine arm 3 regardless of the position where the feed base 10 is moved. It overlaps with 3b. Therefore, when the sewing machine 100 is viewed in plan from above, there is no gap between the arm portion 3b and the feed cover 60. Thereby, the feed cover 60 can be used as a protective plate for preventing an operator from accidentally pinching the hand between the feed base 10 and the arm portion 3b of the sewing machine arm 3 when the feed base 10 is moved. .
Further, since the feed cover 60 is provided not on the sewing machine arm 3 but on the feed base 10, it is not necessary to cover the feed cover 60 over the entire movement range R of the feed base 10. The workability of the cloth C set and parts maintenance can be improved. Moreover, the weight reduction of the pressing device 1 can be achieved.
Further, since the feed cover 60 is provided on the feed base 10, vibrations due to the operation of the needle, the drive of the sewing machine motor, and the like are not transmitted from the sewing machine arm 3, so that the function of the presser device 1 can be sufficiently exhibited. it can.

  Further, since the feed base 10 and other parts covered by the feed cover 60 are normally invisible, it is not possible to find a faulty part or confirm installation, but the feed cover 60 is made of a transparent material such as an acrylic plate. By forming, it is possible to visually recognize the parts covered by the feed cover 60. Therefore, it is not necessary to remove the feed cover 60 in order to find a failure. Even when the cloth C is set, the workability is not deteriorated because the feed cover 60 does not block the field of view.

The perspective view of the sewing machine provided with the pressing device. The exploded perspective view of a pressing device. The perspective view of a pressing device. The side view of a pressing device. The top view of the sewing machine provided with the pressing device. The perspective view of the sewing machine in a prior art. The perspective view of the sewing machine in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine presser 2 Sewing machine bed 3 Sewing machine arm 10 Feed base 20 Presser arm 30 Presser 50 Cylinder device (drive device)
60 Feed cover 100 Sewing machine C Cloth (Sewing product)
P1 Standby position P2 Holding position

Claims (2)

A feed base that is movable in two orthogonal directions along the upper surface of the sewing machine bed on which the sewing machine arm is erected;
A pressing arm provided on the feed base so as to be movable up and down;
A presser that is provided on the presser arm and presses the sewing product from above by lowering the presser arm;
In a sewing machine presser comprising: a drive device that raises and lowers the presser arm so that the presser moves up and down between a standby position in which the presser is retracted from the sewing product and a holding position that holds the sewing product.
The feed base has a base end portion erected on the sewing machine bed, and an upper end surface disposed above the driving device and parallel to the upper surface of the sewing bed,
The sewing machine arm is fixed to the upper end surface of the feed base adjacent to the lower surface of the sewing machine arm, and is disposed along the moving plane of the feed base. A sewing machine pressing device comprising a plate-shaped feed cover formed to overlap with the sewing machine arm below.   2. The sewing machine presser according to claim 1, wherein the feed cover is made of a transparent material.

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