JP2722777B2 - Cloth opening device of holing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) In the present invention, a cut formed in a work cloth is opened by movement of a cloth receiving plate on both sides of the cut in a direction away from each other. The present invention relates to a cloth opening device for a holing machine.

(Prior art) Conventionally, in a holing machine,
Along with providing a fixed cutter extending in the front-rear direction,
A feed base is provided so as to be movable, and a pair of cloth receiving plates are provided on the feed base so as to be located on both sides of the cutter. Each cloth receiving plate is provided with a cloth presser.

And, when performing the buttonhole sewing on the work cloth,
The work cloth is placed on a pair of cloth receiving plates, and is pressed by a cloth presser, and a notch extending in the front-rear direction is formed in the work cloth by a cutter. Thereafter, the cut is opened by moving both sides of the cut of the work cloth in a direction away from each other while being pressed by the cloth presser. In this state, the overlocking operation is performed.

In such a cloth opening, each of the pair of left and right cloth receiving plates is slid almost right beside each other so that the opening width becomes uniform in the entire region in the front-rear direction of the cut. A cloth opening device is provided.

FIG. 8 shows an example of the cloth opening device. As shown in FIG. 1, a mounting part 1 constituting a part of a feed base has a mechanical part 2
Are symmetrical, but the illustration on the left side is omitted here.
Is described. A guide bar 3 extending to the left and right is attached to a rear portion of the attachment base 1. A guide plate 6 is fixed to a front end of a slide plate 5 for connecting and moving the cloth receiving plate 4, and a slide hole 7 is formed at a rear end. The slide plate 5 has a guide bar 6 inserted into a guide hole 8 formed in the mounting base 1, and a slide hole 7 slidably inserted into the guide shaft 3. Therefore, this slide plate 5
Is provided so as to be able to slide almost right beside. The slide plate 5 is driven by a cylinder 9 via a lever 10 and a connecting rod 11.

That is, when the rod 9a of the cylinder 9 moves in the direction of the arrow P, the L-shaped lever 10 rotates in the direction of the arrow Q, whereby the lever 10 and the intermediate portion of the slide plate 5 are connected to each other via the connecting rod 11. The slide plate 5 has an arrow C
Moved in the direction. As a result, the cloth receiving plates 4 are moved in a direction away from each other, so that the cut formed in the work cloth is opened. The movement limit position of the slide plate 5 in the direction of arrow C depends on the stroke end of the cylinder 9, and the movement limit position of the slide plate 5 in the direction of arrow D (the direction opposite to the direction of arrow C) is the axis 3. Is restricted by the stopper 12 fixed to the end of the first member.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional apparatus, the slide bar 4 extending in the left-right direction and the guide bar 6 also extending in the left-right direction are slid to move the cloth receiving plate 4 almost right beside. Therefore, there is a problem that the cloth opening device is large in the left and right directions, the space occupied by the sewing machine is increased, and the size of the sewing machine is increased. In addition, in order to move the slide plate 5 smoothly, it is necessary to increase the parallelism between the guide bar 3 and the guide bar 6 and the surface finishing accuracy, which is extremely troublesome and time-consuming, and generally reduces the manufacturability. It is inferior and has the disadvantage that the production cost is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the space occupied by a sewing machine when opening a cloth, and to realize a hole drilling sewing machine that has a very simple structure and can be manufactured at low cost. A cloth opening device is provided.

[Means for Solving the Problems] The present invention relates to a pair of cloth receiving plates provided on a feed base so as to be located on both left and right sides of a cutter extending in a front-rear direction,
A cloth presser provided on each of the cloth receiving plates, and a notch extending forward and backward by the cutter is formed in the work cloth placed on each of the cloth receiving plates, and both sides of the cut are pressed by the respective cloth pressers. Then, in the cloth opening device of the boring machine that opens the cut by moving the cloth receiving plates in a direction away from each other, an intermediate portion is pivotally supported by the feed base and both ends swing. A pair of left and right link mechanisms, which are configured by connecting a plurality of links in the front-rear direction and are set so that the swing strokes of the free ends on the rear end side and the front end side are the same, are provided at the rear end side and the front end of each link mechanism. A connecting portion connected to the front end and the rear end of each of the cloth receiving plates is provided at the free end on the side, and the cloth receiving plate is moved by operating the link mechanism. Having the features.

(Operation) In the above means, when the link mechanism is operated, the free ends on the rear end side and the front end side of the link mechanism swing with the same stroke. Therefore, the cloth receiving plate slides almost to the side.

In this case, since the link mechanism is configured by connecting a plurality of links, each of which has an intermediate portion pivotally supported by the feed base and swings at both ends, in the front-rear direction, the space required in the left-right direction is small. Also, unlike those having two guide bars and a slide plate, high parallelism and processing accuracy are not required.

(Embodiment) An embodiment in which the present invention is applied to a cloth opening device of an eyelet buttonhole sewing machine will be described below with reference to FIGS. 1 to 7.

First, the overall structure of the sewing machine will be schematically described. As shown in FIG. 7, the sewing machine main body 21 is configured by integrally including a main body frame 24 having an arm portion 23 in a bed portion 22,
It is placed on the sewing machine table 25.

A needle bar 27 having a sewing needle 26 is provided at a lower portion of the distal end of the arm portion 23, and the sewing needle 26 is not shown,
It is driven up and down while swinging left and right by a cam mechanism or the like that operates based on the rotation of the main shaft.

The bed portion 22 has the needle bar 27 as shown in FIG.
The looper base 28 and the needle bar 27 are provided in such a manner as to face each other. Further, the bed portion 22 is provided with a cutter 29 extending in the front-rear direction.
A hammer 30 (see FIG. 7) provided on the main body frame 24 so as to be able to rotate up and down forms a cutter device 31.

As shown in FIG. 1, the bed part 22 is provided with a feed base 32 having a cutout part 32a for releasing the looper base 28 and the cutter 29, and is movable.
The drive mechanism 32 is operated by a drive mechanism (not shown) in accordance with a predetermined operation pattern for eyelet hole drilling. On the feed base 32, a pair of cloth receiving plates 33, 33 are disposed on both left and right sides of the cutter 29, and further, feed base covers 34, 34 are positioned outside the cloth receiving plates 33, 33. Fixed. The right cloth receiving plate 3 among the cloth receiving plates 33, 33
On the upper surface of 3, a plate cover 35 that also covers the upper surface of the left cloth receiving plate 33 is fixed, and this plate cover 35 moves integrally with the right cloth receiving plate 33, and It can slide to 33. Further, the left and right cloth receiving plates 33 are provided with cloth pressers 36, 36, respectively, which are rotatable in a vertical direction via a shaft 55a and an arm portion 55 described later.

Being adapted to be moved the cloth receiving plates 33 and 33 respectively link mechanism 37 (FIG. 1 spare second illustrated only one in the figure) by arrows H ₁ and H ₂ directions, and I to _1, I ₂ directions ,
The cloth pressers 36, 36 are each rotated by a presser mechanism 38 (only one is shown in FIGS. 1 and 3).

The link mechanism 37 and the presser mechanism 38 are provided individually corresponding to the pair of left and right cloth receiving plates 33 and the cloth presser 36, respectively, but each configuration is symmetrical.

Now, since the pair of link mechanisms 37 are bilaterally symmetric, the right link mechanism 37 will be described as a representative in this case. The link mechanism 37 includes a first link 39 and a second link 40. The first link 39 is pivotally supported at an intermediate portion by a shaft 41 so as to be rotatable on the feed base 32. This is the first
A pin 42 projects upward from the rear end of the link 39, and a pin 43 projects downward from the front end. Further, an arm portion 44 extends outward from the intermediate portion. This first link 39 has its lever ratio, la: lb, set to 1: 1. The second link 40 has a middle portion located closer to the front side than the first link 39, and is rotatably supported by the feed base 32 by a shaft 45. A square piece 46 is disposed in the elongated hole 40a formed at the end so as to be movable in the front-rear direction.
39 pins 43 are rotatably connected. A pin 47 projects upward from the front end of the second link 40. Then, the lever ratio of this second link 40, La: Lb
Are also set to 1: 1. Therefore, in this link mechanism 37, the pins 42 and 4 which are free ends on the rear end side and the front end side are set.
The configuration is such that the swing stroke of 7 is set to be the same.

The pin 42 provided as a connecting portion at the free end on the rear end side of the link mechanism 37 is attached to the cloth receiving plate 33.
A pin 47, which is rotatably fitted and connected to a connection hole 48 formed at a rear end portion, and is provided at a free end on the front end side as a connection portion, is rotatably fitted to a square piece 49. Connected
This square piece 49 is slidably fitted in a long hole 50 formed at the front end of the cloth receiving plate 33. And the first link
The arm part 44 of 39 is a rod 51 of a cloth-spreading driving body 51 composed of an air cylinder disposed on the feed base 32 in the front-rear direction.
It is connected to a via a joint 52. The stoppers 53 and 54 are respectively connected to the feed base 32 by the first link 39.
Are attached to the rear end side and the front end side with screws 53a and 54a. Hook holes 53b, 54b are formed at the distal ends of the stoppers 53, 54, respectively, and the screws 53a, 54a are respectively formed in holes 34b formed in the feed plate cover 34.
It is exposed to the outside from a and 34b. Therefore, each stopper 53,
54 has hook holes 53a, 54a with the screws 53a, 54a loosened.
The position can be adjusted by appropriately inserting a tool into and pulling out or pushing in.

On the other hand, in this case, the pressing mechanism 38 on the left side
Will be described as a representative. As shown in FIG. 3, the arm portion 55 provided with the cloth presser 36 at the distal end is rotatably supported by the cloth receiving plate 33 via a shaft 55a. The cloth receiving plate 33 passes through a hole 33a formed in the cloth receiving plate 33.
A 受 け -shaped receiving arm portion 56 extending to the rear side is formed. A link 57 is provided on the feed base 32 with a left and right extending shaft.
It is provided rotatably via 58, and a pin 59 attached to one end thereof is connected to the receiving arm 56. In this case, the receiving arm 56 is slidable in the left-right direction with respect to the pin 59. Further, a pin 60 attached to the other end of the link 57 is connected to a rod 61a of a pressing driving body 61 formed of an air cylinder provided on the feed base 32 by a joint 62.
Are connected via

In the above configuration, when performing eyelet hole drilling on the work cloth 63 (a part of which is shown in FIG. 6), formation of a cut having a round hole at the rear end and cloth opening are performed. These will be described.

First, after placing the work cloth 63 on the pair of cloth receiving plates 33, 33,
When a start switch (not shown) is turned on, the presser foot driving body 61 is driven to operate the rod 61a in the direction of arrow S in FIG. 3, whereby the presser foot 36 is turned downward as shown by arrow Q. Be moved. As a result, the work cloth
63 is pressed. After that, the hammer 30 of the cutter device 31
Is rotated toward the cutter 29, and the work cloth 63 is
6, a notch 64 extending in the front-rear direction and having a round hole 64a is formed as shown by a solid line in FIG.

Thereafter, in a state where both sides of the cut 64 of the work cloth 63 are pressed by the cloth presser 36, the cloth opening drive body 51 is driven such that the rod 51a operates in the direction of arrow T in FIG. hand,
The first link 39 is turned in the direction of the arrow U. And the second
And the interlocking link 40 thereto, has been the pin 42, 47 in the link mechanism 37 swings in the arrow H ₁ direction, the cloth receiving plates 33 and 33
There almost abeam the slides, this results in the arrow H ₁ direction,
The cloth receiving plates 33, 33 are moved in a direction away from each other (see FIG. 5). The notch 64 is then opened as shown by the two-dot chain line in FIG. In this case the arrow H ₁ movement stop at the rear end side of the first link 39 abuts against the stopper 53 is made. In this cloth-open state, the feed base 32 is operated by a drive mechanism (not shown) according to a predetermined operation pattern for eyehole drilling.
Is driven up and down while swinging left and right, and this sewing needle
The hole 26 is rotated in synchronization with the looper base 28 at the time of overturning the hole 64a of the cut 64, and thus the overlocking operation is executed.

After the execution of the overlock stitching operation, necessary thread trimming operation and the like are executed, the cloth presser 36 is rotated upward, and the cloth opening drive body 51 is moved by its rod 51a.
Is driven to operate in the direction opposite to the arrow T, whereby the first link 39 is rotated in the direction opposite to the direction of the arrow U, and the second link 40 is interlocked. As a result, the pivot shafts 42, 47 is the arrow H ₂ direction, the cloth receiving plate 33, 33 is returned is moved parallel in a direction coming close to each other in the initial state.
In this case the arrow H ₂ movement stopped by the front end side of the first link 39 abuts against the stopper 54 is made.

As described above, according to the present embodiment, the first link 39 and the second link 40 are provided, and the free ends on the rear end side and the front end side, and the pins 42 and 47 as the connecting portions are swung with the same stroke. Since the moving link mechanism 37 is provided, the cloth
3,33 can be slid almost right beside.

In this case, the link mechanism 37 has a first link 39 whose intermediate portion is pivotally supported by the feed base 32 and whose both ends swing.
Since the second link 40 and the second link 40 are connected in the front-rear direction, the space required in the left-right direction can be reduced. In addition, since there are a plurality of links 39, 40 in this case, unlike those having two guide bars and a slide plate, high parallelism and processing accuracy are not required, and as a result, the configuration is extremely high. It is simple and the production cost can be kept low.

In the above embodiment, by setting the lever ratio of the first link 39 and the lever ratio of the second link 40 to 1: 1 respectively, the free end on the rear end side and the front end side of the link mechanism 37 is set. Are set to be the same, but it is possible to set the same swing stroke even if each lever ratio is changed. The number of links in the link mechanism 37 is not set to two.

[Effects of the Invention] As is clear from the above description, the present invention is configured by connecting a plurality of links each having an intermediate portion pivotally supported by the feed base and swinging at both ends in the front-rear direction, A pair of left and right link mechanisms are provided so that the swing stroke of the free end on the front end side is the same, and the front end and the rear end of each of the cloth receiving plates are provided on the free end on the rear end side and the front end side in each link mechanism. A connecting portion is provided to connect to each end, and the cloth receiving plate is moved by operating the link mechanism, so that the size in the left-right direction can be reduced, and the occupied space in the sewing machine can be reduced, and Because it is a configuration that can contribute to downsizing and combines multiple links, it has high parallelism and processing accuracy unlike those with two guide bars and slide plates. As a result, there is an excellent effect that the configuration is extremely simple and the production cost can be kept low.

[Brief description of the drawings]

1 to 7 show an embodiment of the present invention.
1 is a plan view of a part of a feed base partly cut away, FIG. 2 is a longitudinal sectional view of a link mechanism part, FIG. 3 is a side view of a cloth holding mechanism part, and FIG. FIG. 5 is a schematic plan view of a feed base portion in a cloth-open state, FIG. 6 is a plan view showing a cut, and FIG. 7 is a side view showing the entire configuration. FIG. 8 is a plan view of a cloth opening device showing a conventional example. In the drawing, 26 is a sewing needle, 28 is a looper base, 29 is a cutter, 30 is a hammer, 31 is a cutter device, 32 is a feed stand, 33
Is a cloth receiving plate, 36 is a cloth presser, 37 is a link mechanism, 38 is a presser mechanism, 39 is a first link, 40 is a second link, 42 is a pin (connecting portion), 47 is a pin (connecting portion), Reference numeral 51 denotes a cloth opening drive, 56 denotes a receiving arm portion, and 61 denotes a pressing drive.

Claims (1)

(57) [Claims] 1. A pair of cloth receiving plates provided on a feed base so as to be located on both left and right sides of a cutter extending in a front-rear direction,
A cloth presser provided on each of the cloth receiving plates, and a notch extending forward and backward by the cutter is formed in the work cloth placed on each of the cloth receiving plates, and both sides of the cut are pressed by the respective cloth pressers. Then, in the cloth opening device of the boring machine that opens the cut by moving the cloth receiving plates in a direction away from each other, an intermediate portion is pivotally supported by the feed base and both ends swing. A pair of left and right link mechanisms, which are configured by connecting a plurality of links in the front-rear direction and are set so that the swing strokes of the free ends on the rear end side and the front end side are the same, are provided at the rear end side and the front end of each link mechanism. The free end on the side is provided with a connecting portion that is connected to the front end and the rear end of each of the cloth receiving plates, and the cloth receiving plate is moved by operating the link mechanism. Cloth opening device of holing sewing machine and butterflies.