JP2661393B2 - Presser foot device of automatic sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth presser of an automatic sewing machine having a function of clamping a workpiece.

[0002]

2. Description of the Related Art FIG. 10 shows a conventional sewing machine of this type. In the figure, 1 is an arm of a sewing machine head,
Reference numeral 2 denotes a bed on the head of the sewing machine, 3 denotes a driving device for driving the cloth presser 5 in accordance with a predetermined pattern, 4 denotes a sewing machine table having the sewing machine bed 2 built therein, and 5 denotes a driving device for clamping the workpiece to be sewn. The presser foot device driven in the XY directions, 6 is a storage device storing a pre-programmed pattern, 7 includes a storage device 6 for controlling the sewing machine heads 1, 2 and the drive device 3. Control device,
And 8, an operation panel for setting operating conditions and sewing patterns,
9 is an operation switch for operating the sewing machine, and 10 is a main body frame on which the above peripheral devices are mounted.

FIG. 11 shows the details of a conventional cloth presser 5 for clamping a sewing object by power. The presser foot device 5 includes a presser drive mechanism 11 and a presser foot mechanism 12. In the presser drive mechanism 11, 13 is a plurality of guide bearings fixed to the sewing machine arm 1, 14 is a guide bar that is supported by the guide bearing 13 so as to be movable up and down, 15 is a bracket fixed to the sewing machine arm 1, and 16 is a bracket. An air cylinder 17 attached to 15 is a holding slide plate supported by the plurality of guide bars 14 and connected to the rod 16a of the air cylinder 16. On the other hand, in the cloth presser mechanism 12, reference numeral 18 denotes a presser table mounted and fixed to the driving device 3, 19 denotes a presser arm,
Reference numeral 0 denotes an upper holding plate. One end of the holding arm 19 is pivotally attached to the holding table 18 with a shaft 21 and the other end is connected to the upper holding plate 20 with a shaft 22 so as to be swingable. 23 is a stand fixed to the presser stand 18, 24 is a mounting stand fixed to the stand 23, 25
Is an air cylinder. One end of an air cylinder 25 is pivotally connected to a holding arm 19 by a shaft 26 and the other end is mounted to a mount 24 by a shaft 27 so as to be swingable. Reference numeral 28 denotes a lower holding plate, one end of which is fixed to the holding table 18, and the other end of which is extended and laid to just below the upper holding plate 20. Both the upper holding plate 20 and the lower holding plate 28 are provided with opening holes in the sewing range formed by moving in two axial directions in parallel with the upper surface of the sewing machine bed built in the sewing machine table 4. Sewing work is not possible. This point is publicly known and is not shown in the drawings (the situation of the opening can be seen in FIG. 10).

Further, a sliding mechanism 29 is mounted near the center of the holding arm 19, and a sliding surface 17 of the holding sliding plate 17 is provided.
It is in a positional relationship of sliding with a. FIG. 12 shows the sliding mechanism 2
Reference numeral 30 denotes a spherical slide bearing fitted and mounted in the bearing hole 19a of the holding arm 19, and 31 denotes a holding plate for fixing the outer ring 30a of the spherical sliding bearing 30 to the holding arm 19 by bolts 32. 33 is a main shaft, 34 is a flat screw for fastening the main shaft 33 to the inner ring 30b of the spherical plain bearing 30, and 35 is a slider, which is fitted to the main shaft 33 by a countersunk screw 36. The bearings 29b of the sliding mechanism 29 are fixed together. As shown in FIG. 13, the spherical slide bearing 30 utilizes the feature that the sliding surface of the outer ring 30a is spherical, and tilts (swings) the slider 35 in the direction of arrow AB and arrow C- Rotation (turning) in the D direction is possible.

Next, the operation will be described. FIG. 14 shows a state of the sewing start origin position, in which a sewing object is set between the upper holding plate 20 and the lower holding plate 28. By operating the power switch, the control circuit of the control device 7 shown in FIG. 10 is applied, and the start of the work clamp is commanded by the operation switch 9.
(Normally, the operation switch 9 only needs to have the two functions of the presser foot and the sewing start, and two switches are used. In this conventional example, a double switch may be used, and the illustrated triple switch will be described later in the embodiment. This applies to the case with the additional function described). Compressed air is supplied to the air cylinder 25 in response to a command to start the presser foot, the rod of the air cylinder 25 is pushed out, and the presser arm 19 pivotally connected to the shaft 26 is turned around the shaft 21 pivotally connected to the presser table 18 as an arrow. Turn in the E direction. This operation lowers in the direction of arrow F at the holding portion 19 of the holding arm 19 (the portion where the upper holding plate 20 and the lower holding plate 28 overlap), and holds the sewing object. However, the holding force cannot be increased because the holding arm 19 is long. It is easy to increase the output of the air cylinder 25, but it is essential to strengthen the presser arm in proportion to the output, and it is general to limit the output to such an extent that the presser arm 19 is raised and lowered for practical use. . For this reason, the presser drive mechanism 11 is provided on the sewing machine arm 1. When the presser foot switch of the operation switch 9 is turned on again, the compressed air is supplied to the air cylinder 16, the rod 16a of the air cylinder 16 is pushed out, and the presser slide plate 17 is guided by the guide bar 14 and descends. As it descends, the presser slide plate 17 starts to press against the slide mechanism 29 attached to the presser arm 19, and the pressing force is transmitted to the upper presser plate 20 via the presser arm 19, and becomes a clamping force on the workpiece. .

FIG. 15 shows the operation after clamping the sewing object. In FIG. 1, a driving device 3 has a function of driving in the X-Y two-axis directions, and is installed in parallel with the sewing machine bed 2 (or the sewing machine table 4). Presser foot mechanism 1
When the driving device 3 moves in the direction of arrow G from the position indicated by the dotted line, the air cylinder 16 of the presser driving mechanism 11
And the presser slide plate 17 is held at the lower end.
The presser sliding plate 17 has an area corresponding to the plane of movement of the presser table 18, and prevents the slider 35 from detaching from the sliding surface 17a. The pressed slider 35 moves in the direction of the arrow G while sliding on the sliding surface 17a, but the swinging function of the spherical slide bearing 30 built in the sliding mechanism 29 is exerted, and the slider 35 is pressed. Slides while always maintaining a close contact posture with the sliding surface 17a. The material of the slider 35 is a non-lubricating and slippery resin. The pressing force transmitted in this manner is received by the sewing machine bed 2 (or the sewing machine table 4), and the sewing operation is performed by turning on the sewing start switch of the operation switch 9 while maintaining the holding state between the upper holding plate 20 and the lower holding plate 28. .

However, the sliding surface 1 of the presser sliding plate 17
What happens if 7a is not parallel to machine bed 2? FIG. 16 shows such a state.
When 7 is inclined downward to the right, as the presser foot mechanism 12 moves in the direction of arrow G, the distance between the sliding surface 17a and the sliding mechanism 29 becomes narrower, the pressing force (arrow J) increases, and an overload state occurs. Leads to. Also, when a thick material to be sewn is clamped, the position of the presser arm 19 becomes higher in accordance with the thickness, and the distance between the slide surface 17a and the slide mechanism 29 becomes narrower as described above, so that the pressing force is reduced. Overload. On the other hand, the presser foot mechanism 1
When 2 is moved, the distance between the sliding surface 17a and the sliding mechanism 29 is widened, the pressing force is reduced, and the clamping force on the workpiece is insufficient. Since resin is used for the material of the slider 35, wear is inevitable, and the distance between the sliding surface 17a and the sliding mechanism 29 increases with wear, resulting in insufficient clamping force.

[0008]

Since the conventional cloth presser is constructed as described above, if the pressing of the cloth presser mechanism 12 causes an overload or a shortage of the clamping force, it directly affects the quality of the sewn product. Therefore, it is necessary to keep the sliding surface of the presser slide plate 17 parallel to the surface of the sewing machine bed 2 and the lower end position of the presser slide plate 17 although the conventional cloth presser has no function. It is necessary to make adjustments in accordance with the thickness of the sewing object and the wear of the slider 35.

The first invention has been made in order to solve the above-mentioned problems, and alleviates the restriction due to the assembly accuracy (parallelism) of the sliding plate, and wears a thick sewing product or a slider. It is another object of the present invention to provide a cloth presser capable of always holding a sewing object with a constant force without requiring adjustment of a lower end position of a presser slide plate.

A second aspect of the present invention is to provide a cloth presser capable of setting an optimal clamping force by adding a clamping force adjusting function to the first invention.

According to a third aspect of the present invention, there is provided a cloth holding device in which a plurality of clamping force adjusting functions are provided to the second invention, and the clamping force at the time of setting the sewing object and the clamping force at the time of sewing can be easily individually set. With the goal.

[0012]

According to a first aspect of the present invention, a presser foot device for an automatic sewing machine includes a lower presser plate , an upper presser plate, and a lower presser plate.
One end is pivotally supported by the upper holding plate, and the other end is
And a holding arm that can be supported.
A cloth pressing mechanism freely open, in pressing the sliding plate which is mounted for vertical movement on the sewing machine arm, the upper via presser arm
A presser drive mechanism that presses the presser plate, and near the center of the presser arm
Provided, and slides the presser slide plate so that it can swing and rotate.
The sliding mechanism and the work clamp
A drive device for driving the presser foot mechanism in two axial directions parallel to the sewing machine bed surface , a presser foot mechanism, a presser drive mechanism, and a drive device
In the presser foot device of the automatic sewing machine having a control device for controlling the placement , the sliding mechanism is provided near the center of the presser arm.
Outer ring fitted and fitted to inner hole and inner ring that can swing and rotate
And a bearing engaged with and fixed to an inner ring of the bearing.
Shaft, and fixed to one end of this shaft,
And the other end of the shaft while being inserted into the hole
And an elastic body pressed against the elastic member .

[0013] Further, the cloth presser of the automatic sewing machine according to the second invention comprises a lower presser plate, an upper presser plate and an upper presser plate.
One end is pivotally supported and the other end is pivotally supported on the presser base.
Clamped arm, and can clamp and release
Press the upper presser plate through the presser arm with the work clamp mechanism and the presser slide plate
A presser drive mechanism that presses and is provided near the center of the presser arm
And a drive mechanism for fixing the presser base of the presser foot mechanism in such a manner that the presser slide plate is slidably and pivotably movable, and driving the presser foot mechanism in two axial directions parallel to the sewing machine bed surface. And a presser mechanism of an automatic sewing machine having a presser mechanism, a presser drive mechanism, and a control device for controlling the drive device, wherein the sliding mechanism is a first presser provided near the center of the presser arm.
The slider that can be moved up and down
An outer ring fitted and mounted in a second hole provided in the slider
And a bearing having an inner ring that can swing and rotate, and this bearing
And a shaft fixed to one end of the shaft
And the slider that slides on the presser slide plate and the slider
And a fluid cylinder having a rod fixed to the bottom surface .

Further, the cloth presser of the automatic sewing machine according to the third aspect of the present invention is a cloth presser capable of setting the pressure of a fluid cylinder.
It is provided with a fluid pressure adjusting circuit composed of several systems .

[0015]

The elastic body according to the first aspect of the present invention absorbs the overload when the slider is over-pressed, and conversely, the pressing of the slider (insufficient clamping force) occurs. When it expands, it replenishes the shortage.

The fluid cylinder according to the second aspect of the present invention absorbs excessive pressure or insufficient pressure acting on the slider by adjusting the fluid pressure.

Furthermore, the fluid pressure adjusting circuits of a plurality of systems in the third invention are used for switching control of the fluid pressure of the fluid cylinder.

[0018]

[Embodiment 1] Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a sliding mechanism 29 according to the first invention, which is mounted near the center of the presser arm 19, and in the drawing, reference numeral 30 denotes a bearing hole 19a of the presser arm 19.
A spherical sliding bearing 31 fitted and movably mounted on the upper surface of the sliding bearing 31, and a mounting plate 29 a of the sliding mechanism 29 formed by a holding plate for receiving the protrusion of the spherical sliding bearing 30 by the outer ring 30 a by the bolts 32 on the holding arm 19; 33 is a main shaft; 34 is a flat screw for fastening the main shaft 33 to the inner ring 30b of the spherical sliding shaft;
Is a slider, which is fitted and fixed to the main shaft 33 by a countersunk screw 36 to form a bearing 29b of the sliding mechanism 29. Reference numeral 37 denotes an elastic body, one end of which is placed on a stepped seating surface of a bearing hole 19a of the holding arm 19, and the other end is pressed against the outer ring 30a.
Is constantly pressed upward by the elastic force of the elastic body 37. In other respects, the configuration is the same as that of the related art. As shown in FIG. 2, the slider 35 slides on the sliding surface 17a of the holding slide plate 17, and the upper holding plate 20 and the lower holding plate 20 The work to be sewn is held by the presser plate 28.

Next, the operation will be described. The operation of the operation switch 9 from turning on the presser foot switch to holding the workpiece is the same as the conventional operation, and the description is omitted. The air cylinder 16 is started by turning on the work clamp switch for the second time, and the presser slide plate 17 is lowered to the stroke end of the rod 16 a of the air cylinder 16. This position is the lower end of the holding slide plate 17, and FIG. 2 shows a state where the sliding surface 17a has pressed the slider 35 in the sliding mechanism 29 of the first invention. In the same figure, the bearing portion 29b including the pressed slider 35 pushes down the mounting portion 29a through the bearing hole 19a as a guide. An elastic body 37 is interposed on the lower surface of the mounting portion 29a. This type of elastic body 37 includes, in addition to the coil spring shown in the illustrated example, a columnar or cylindrical rubber having a high elastic force, an air-injected rubber ball, and the like. Each characteristic can be effectively adjusted according to the application and usage. Can be used. Mounting part 2
The elastic body 37 compressed by the lowering of 9a generates a stress (repulsive force) proportional to the compression, and the force acts so that the slider 35 pushes up the sliding surface 17a. Since the pressing force of the air cylinder 16 on the side is made stronger, the pressing is stopped and the pressing arm 19 is pressed as a reaction force. As a result, the holding arm 19 becomes the same as the conventional upper holding plate 2.
By pushing down 0, it becomes the clamping force of the sewing object.

As shown in the figure, when the presser slide plate 17 is inclined downward to the right, as the cloth presser mechanism 12 moves in the direction of arrow G, the slider 35 is pressed down and the elastic body 37 is further compressed. However, the pressing force on the slider 35 does not directly cause excessive pressing of the presser arm 19, but is accumulated in the elastic body 37. That is, the overload is absorbed and accumulated in the elastic body 37. The same applies to the case where a thick material to be sewn is clamped. The presser arm 19 is lifted in accordance with the thickness, and the overload generated due to the increased compression of the elastic body 37 is absorbed by the elastic body 37. Stored. The elastic body 37 has a unique spring constant, and it is difficult to completely absorb and accumulate the overload, and the increase in stress due to the spring constant is small but inevitably affects the clamping force. . On the other hand, when the cloth presser mechanism 12 moves in the direction of arrow H, the sliding surface 17a moves away from the slider 35, but the elastic body 37 expands due to the accumulated stress and the slider 35 slides. It is pushed up so as to follow the moving surface 17a, and keeps pressing the upper presser plate 20 via the presser arm 19 with the reaction force thereof, thereby maintaining the holding force on the workpiece. Similarly, when the slider 35 made of a resin material is worn, the elastic body 37 expands by an amount reduced by the wear of the slider 35 to move the slider 35 to the sliding surface 17a. Press to maintain the clamping force on the workpiece.

Embodiment 2 FIG. By the way, the elastic body 3
Although the holding force is maintained by the stress accumulated in the elastic body 37 during the expansion of the elastic body 7, the decrease in the stress accompanying the expansion of the elastic body 37 is slight due to the above-mentioned inherent spring constant of the elastic body 37. However, it is inevitable to affect the pinching force. A second embodiment capable of solving this inconvenience will be described below with reference to FIGS. FIG. 3 shows a sliding mechanism 29 in which the elastic body 37 according to the first embodiment is used as an air cylinder. Reference numeral 38 denotes an air cylinder fixedly mounted on the holding arm 19, which is a fluid cylinder; and 39, an air cylinder. A slider 40 screwed to the rod 38a of 38, a bush 40 fitted and inserted into the holding arm 19 and guiding the slider 39 to be movable in the vertical direction, and 41 is a compressed air as a fluid pressure adjusting circuit connected to the air cylinder 38. Circuit. Reference numeral 30 denotes a spherical plain bearing fitted and mounted on the slider 39, and 31 denotes an outer ring 30a of the spherical bearing 30 on the slider 39 by bolts 32.
, A mounting portion 29a of the sliding mechanism 29, 33 is a main shaft, 34 is a flat screw for fastening the main shaft 33 to the inner ring 30b of the spherical plain bearing 30, and 35 is a flathead screw with a slider. 36 and the sliding mechanism 29
Of the bearing portion 29b. FIG. 4 shows the cloth presser 5 to which the sliding mechanism 29 according to the second embodiment is mounted. FIG. 5 shows a state in which the sliding mechanism 29 in the second embodiment has increased the stroke L shown in FIG. 3 from the stopped state in FIG.

When compressed air is supplied from the compressed air circuit 41, the air cylinder 38 protrudes the rod 38a and pushes up the bearing portion 29b bearing the slider 35 via the slider 39 guided by the bush 40. This sliding mechanism 29
When assembling into the presser foot device 5, the presser slide plate 17 on the presser drive mechanism 11 side is pressed so that the slider 35 is pressed from the N direction to a height at which the stroke of the air cylinder 38 becomes about １ ／.
Position the falling edge of For example, even when the holding slide plate 17 is inclined with poor assembly accuracy as shown in FIG.
The deviation due to the inclination (l ₁ → l ₂ in the figure) is
The air cylinder 38 is designed so that it can operate effectively within the stroke 8. The output of the air cylinder 16 on the side of the presser slide plate 17 is higher than that of the air cylinder 38 on the side of the slider 35 to receive the push-up of the slider 35.
Thus, in exactly the same way as the operation of the first embodiment, the reaction force of the slider 35 pressing the sliding surface 17a pushes down the upper holding plate 20 via the holding arm 19 to hold the sewing object. I do.

The holding force can be arbitrarily set in the compressed air circuit 41 of the sliding mechanism according to the embodiment shown in FIG. That is,
The compressed air drawn from the compressed air source 43 is supplied to a filter 44.
Then, the secondary pressure of the compressed air is adjusted by the pressure-reducing valve 45 with relief and supplied to the air cylinder 38. This pressure is the output of the air cylinder 38 and is also the clamping force. When the slider 35 is depressed by the inclined presser sliding plate 17 or the presser arm 19 sandwiching a thick material to be sewn, the rod 38a is pushed back and compressed air is compressed by the piston 38b inside the air cylinder 38. And the secondary pressure increases. When the secondary pressure exceeds the set value, the pressure reducing valve 45
From the air (self-control) to maintain the set value. The presser slide plate 17, which is inclined in reverse to the above,
Alternatively, when the slider 35 is pushed up due to the wear of the slider 35, the piston 38 pushes the rod 38a by the piston 38 by the internal pressure of the air cylinder 38. With this operation, the secondary cylinder pressure is reduced due to the expansion of the internal volume of the air cylinder. However, compressed air is supplied by the pressure reducing valve 45 to recover the pressure to the set pressure. Therefore, even if excessive pressure acts on the slider 35 or insufficient pressure acts on the slider 35, the air cylinder 38 is always operated.
And a stable holding of the sewn material is maintained, and the holding force is maintained at the set pressure of the compressed air regardless of the behavior of the slider.

Embodiment 3 FIG. In the second embodiment,
Although the case where the compressed air is always supplied to the air cylinder 38 is shown, if it is desired to add a function of releasing the pressing by pulling down the slider 35 from the sliding surface 17a, the compressed air flow path is required. There is a method in which an electromagnetic valve (not shown) for switching control is provided in the piping between the pressure reducing valve 45 and the air cylinder 38. FIG. 8 shows the sliding mechanism 2 in the second embodiment described above.
9 shows a third embodiment in which the compressed air circuit 42 to No. 9 has a plurality of systems. In this compressed air circuit 42, the compressed air drawn from the compressed air source 43 is dehumidified by a filter 44, the secondary pressure of the compressed air is adjusted by a pressure reducing valve 45 with relief, and divided into two systems at a branch point P. , M-1 system (hereinafter referred to as low pressure) is regulated again by the pressure reducing valve 46 with relief, and is supplied from the branch point Q to the air cylinder 38 via the solenoid valve 47. In the M-2 system (hereinafter, referred to as high pressure), the compressed air regulated by the pressure reducing valve 45 with relief is supplied to the air cylinder 38 from the branch point Q via the solenoid valve 48 with check.

Now, a description will be given of an embodiment in which the triple operation switch 9 shown in FIG. 10 which has been briefly described in the prior art is applied thereto. The functions of the three operation switches 9 are cloth presser-slider presser-sewing start. First, the air cylinder 25 is driven by turning on the cloth presser switch, and the presser arm 19 turns and descends onto the surface of the sewing machine table 4. Next, when the presser foot switch is turned on again, the air cylinder 16 of the presser drive mechanism 11 is driven to lower the presser slide plate 17. Next, when the slider holding switch is turned on, the electromagnetic valve 47 is excited to open the flow path, and low-pressure compressed air is supplied to the air cylinder 38. Lower the output of the air cylinder 38 to lightly clamp the workpiece,
In this state, the wrinkles of the sewing object caused by the clamping operation are removed and the positional deviation is corrected. When the slider holding switch is turned on again after the work is completed, the solenoid valve 47 is demagnetized and the flow path is closed, and at the same time or after a lapse of time, the solenoid valve 48 is excited and the flow path is opened, and high-pressure compressed air is released from the air cylinder. 38. The output of the air cylinder 38 due to the high pressure is set as a clamping force at the time of sewing. Since the operation and operation of the sliding mechanism 29 at the time of high pressure are the same as those of the second embodiment, the description is omitted. When the switching to the high pressure is completed, the sewing start switch is turned on to start the sewing. When returning from high pressure to low pressure, the solenoid valve 48 is demagnetized and the solenoid valve 47 is excited. The high-pressure compressed air remaining in the air cylinder 38 and the piping is relieved (released to the atmosphere) from the pressure reducing valve 47 to reduce the pressure to a low pressure. The presser foot can be released by operating the presser foot switch or automatically releasing the sewing end signal. However, a low pressure or a high pressure always acts on the slider 35 as a residual pressure. If it is necessary to remove the residual pressure during maintenance or inspection, the compressed air source 43 is disconnected and the compressed air in the air cylinder 38 flows backward, passes the check of the solenoid valve 48, passes through the source pressure valve 45, and passes through the filter 44. Released to the atmosphere.

Embodiment 4 FIG. In the first embodiment,
The elastic body 37 is provided between the stepped seating surface of the bearing hole 19a of the holding arm 19 and the outer ring 30a of the spherical plain bearing 30, but the main shaft 33 is connected to the inner race 30b of the spherical plain bearing 30 as shown in FIG.
The same effect can be obtained even if the elastic member 37 is provided between the slider 35 and the inner ring 30b so as to be able to move up and down freely. In the second and third embodiments, the case using air pressure has been described. However, it goes without saying that hydraulic pressure may be used.

[0027]

As described above, according to the first aspect of the present invention, the sewing object is clamped by utilizing the stress of the elastic body. A finished sewing process is obtained.

According to the second aspect of the present invention, the clamping pressure of the sewing object is controlled by adjusting the fluid pressure to the fluid cylinder. Optimal holding force can be set for the workpiece, and a high quality sewing can be obtained.

According to the third aspect of the present invention, the fluid cylinder for controlling the clamping pressure of the workpiece is switched by a plurality of fluid pressure adjusting circuits. Therefore, only the fluid pressure adjusting circuit is switched. In other words, with a simple operation, it is possible to eliminate the excess and deficiency of pressing the presser arm, set the optimal clamping force, and correct the displacement of the workpiece in the clamping state with low pressure, etc., and high sewing quality and workability There is an effect that the improvement of can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing a sliding mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional side view showing the operation of the sliding mechanism according to one embodiment of the present invention.

FIG. 3 is a sectional side view showing a sliding mechanism according to a second embodiment of the present invention.

FIG. 4 is a side view showing a holding state of a cloth presser according to a second embodiment of the present invention.

FIG. 5 is a sectional side view showing an operation of a sliding mechanism according to a second embodiment of the present invention.

FIG. 6 is a side view showing the operation of the presser foot device according to the second embodiment of the present invention.

FIG. 7 is a piping diagram showing a compressed air circuit of a sliding mechanism according to a second embodiment of the present invention.

FIG. 8 is a piping diagram showing a compressed air circuit of a sliding mechanism according to a third embodiment of the present invention.

FIG. 9 is a sectional side view of a sliding mechanism showing another embodiment of the first embodiment of the present invention.

FIG. 10 is a perspective view showing the appearance of a conventional automatic sewing machine.

FIG. 11 is a side view showing a conventional cloth presser.

FIG. 12 is a cross-sectional side view showing a conventional sliding mechanism.

FIG. 13 is a sectional side view showing the operation of a conventional sliding mechanism.

And FIG. 14 is a side view showing a conventional cloth presser device before a workpiece is clamped.

FIG. 15 is a side view showing a state in which a conventional cloth presser is nipped and moved.

FIG. 16 is a side view showing the operation of the conventional cloth presser.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sewing machine arm 2 sewing machine bed 3 drive device 7 control device 12 cloth holding mechanism 17 holding slide plate 18 holding table 19 holding arm 29 sliding mechanism 29a mounting portion 29b bearing portion 35 slider 37 elastic body 38 air cylinder 39 slider 41 Compressed air circuit 42 Compressed air circuit

Claims (3)

(57) [Claims] 1. A lower holding plate, an upper holding plate and an upper holding plate.
One end is pivotally supported and the other end is pivotally supported on the presser base.
Clamped arm, and can clamp and release
A cloth pressing mechanism, in pressing the sliding plate which is mounted for vertical movement on the sewing machine arm, and <br/> foot drive mechanism for pressing the upper pressing plate via the presser arm, near the center of the presser arm And the presser rail
A sliding mechanism for sliding the moving plate so as to swing and rotate, a driving device for fixing the presser table of the cloth presser mechanism, and driving the cloth presser mechanism in two axial directions parallel to the sewing machine bed surface; In a cloth presser of an automatic sewing machine , comprising: the cloth presser mechanism; the presser drive mechanism; and a control device for controlling the drive device, wherein the sliding mechanism has a hole provided near a center of the presser arm.
Has an outer ring fitted and mounted and an inner ring that can swing and rotate.
Bearing, a shaft engaged with and fixed to the inner ring of the bearing, and fixed to one end of the shaft,
Moving slider and inserted into the hole and pressed against the other end of the shaft
A presser foot device for an automatic sewing machine, comprising an elastic body . 2. The lower holding plate, the upper holding plate and the upper holding plate.
One end is pivotally supported and the other end is pivotally supported on the presser base.
Clamped arm, and can clamp and release
A cloth pressing mechanism, in pressing the sliding plate which is mounted for vertical movement on the sewing machine arm, and <br/> foot drive mechanism for pressing the upper pressing plate via the presser arm, near the center of the presser arm And the presser rail
A sliding mechanism for sliding the moving plate so as to swing and rotate, a driving device for fixing the presser table of the cloth presser mechanism, and driving the cloth presser mechanism in two axial directions parallel to the sewing machine bed surface; In a cloth presser of an automatic sewing machine , comprising: the cloth presser mechanism; the presser drive mechanism; and a control device for controlling the drive device, wherein the sliding mechanism is provided near a center of the presser arm.
A vertically movable slider inserted into one hole, and a second hole provided in the slider is fitted and mounted.
A bearing having an outer ring and an inner ring capable of swinging and turning;
A shaft engaged with and fixed to the inner ring of the bearing, and fixed to one end of the shaft,
A moving slider and a fluid cylinder having a rod fixed to the bottom surface of the slider
And a presser foot device for an automatic sewing machine. 3. The presser foot device for an automatic sewing machine according to claim 2, further comprising a fluid pressure adjusting circuit comprising a plurality of systems capable of setting the pressure of the fluid cylinder.