JPH0424075A - Cloth opening device for hole-stitching sewing machine - Google Patents

Abstract

PURPOSE:To simplify composition and lower a manufacturing cost by arranging connecting sections for connecting the front end section and rear end section of respective cloth receiving plates respectively to free ends on the front and rear end sides of a pair of left and right link mechanisms, and by contriving the cloth receiving plates to be moved with the working of the link mechanisms. CONSTITUTION:In a pair of left and right link mechanisms 37, intermediate sections are supported respectively and axially on a feed base 32, and both the ends are composed of a plurality of oscillating links 39, 40 connected in the front and rear directions, and oscillating strokes at free ends on the rear end side and front end side are set to be the same ones. Connecting sections 42, 47 for connecting the front end section and rear end section of respective cloth receiving plates 33 at the free ends on the rear end side and front end side in the respective link mechanisms 37, respectively to each other are arranged, and the link mechanisms 37 are worked, and the left and right cloth receiving plates 33 are respectively moved. In other words, on opening a cloth piece, the occupied space of a sewing machine can be diminished, and composition can be simplified, and a manufacturing cost can be lowered.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a method for making a notch formed in a work cloth so that cloth holders on both sides of the notch open as the plates move in the direction of separation from each other. This invention relates to a fabric opening device for a hole sewing machine.

(Prior Art) Conventionally, in a hole sewing machine, a cutter extending in the front-rear direction is fixedly provided in the bed portion, and a feed table is provided in a movable manner. A pair of cloth supports is provided with a plate so that they can be positioned. Each cloth holder is equipped with a cloth presser on the plate.

When performing overhole stitching on the work cloth, the work cloth is placed on a pair of cloth supports, held down by a cloth presser foot, and a cut extending in the front-rear direction is formed in the work cloth by a cutter. Thereafter, both sides of the cut in the work cloth are held down by a cloth presser and moved in a direction away from each other, thereby opening the cut. Note that in the second cloth-opening state, the cover stitching operation is performed.

In this type of cloth opening, the pair of left and right cloth supports slide each plate horizontally so that the width of the opening is uniform over the entire area in the front and back direction of the notch. For this purpose, it is equipped with a cloth opening device.

As the cloth opening device, there is one having a structure shown in FIG. As shown in the figure, the mechanism parts 2 are symmetrically constructed on the left and right sides of the base 1, which is a part of the feed base, but the left side is not shown in the figure. is omitted, therefore, the mechanism section 2 on the right side will be described.

For installation, a guide bar 3 extending left and right is attached to the rear of the stand 1. A slide plate 5 for connecting and moving the cloth receiver with the plate 4 has a guide bar 6 fixed to its front end and a sliding hole 7 formed at its rear end. The guide bar 6 of the slide plate 5 is inserted into a guide hole 8 formed in the base 1, and the slide hole 7 is slidably inserted into the guide shaft 3.

Therefore, this slide plate 5 is provided so as to be able to slide almost horizontally. The lever 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 middle part of the slide plate 5 are connected via the connecting rod 11. The slide plate 5 is moved in the direction of arrow C. As a result, the cloth receiver is moved in the direction in which the plates 4 are separated from each other, thereby opening the notch formed in the work cloth. 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 the arrow (opposite direction to the direction of arrow C) depends on the axis 3. It is regulated by a stopper 12 fixed to the end of.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional device, although the cloth receiver slides the plate 4 almost right sideways, the guide bar 3 extends in the left-right direction, and the guide bar 6 also extends in the left-right direction.
and a slide plate 5 that is moved by these, the fabric opening device is large from side to side, which increases the space occupied by the sewing machine, resulting in a problem that the sewing machine becomes larger. In addition, in order to move the slide plate 5 smoothly, it is necessary to increase the parallelism between the guide bars 3 and 6 and the surface finish accuracy, which makes manufacturing extremely troublesome and time-consuming, and generally reduces productivity. It has the drawbacks of being inferior and being expensive to produce.

The present invention has been made in view of the above circumstances, and its purpose is to provide a hole sewing machine that can reduce the space occupied by the sewing machine when opening cloth, has an extremely simple configuration, and can keep manufacturing costs low. To provide a cloth opening device.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, a pair of cloth holders provided on a feed base so as to be positioned on both left and right sides of a cutter extending in the front-rear direction are plates, and each cloth holder is provided with a plate. and a presser foot provided on a plate, the canvas holder forms a notch extending back and forth in the work cloth placed on the plate by the cutter, and with both sides of the cut being pressed by the cloth pressers, A cloth support is a cloth opening device for a hole sewing machine in which the notch is opened by moving the plates away from each other, and includes a plurality of links each having an intermediate portion pivoted on the feed base and swinging at both ends. A pair of left and right link mechanisms are provided in which the free ends on the rear end side and the front end side are set to have the same swing stroke. Each of the cloth holders is provided with a connecting portion connecting with the front end and the rear end of the plate at the free end thereof, and the cloth holder moves the plate by operating the link mechanism.

(Function) 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 plate of the cloth tray slides almost horizontally.

In this case, this link mechanism is constructed by connecting a plurality of links in the front and back direction, each of which has its intermediate portion pivoted on the feed base and swings at both ends, so it requires only a small space for lateral arrangement. Also, unlike the one with two guide bars and slide plates, it does not require high parallelism and processing accuracy.

(Example) Hereinafter, an example in which the present invention is applied to a cloth opening device of an eyelet sewing machine will be described with reference to FIGS. 1 to 7.

First, the overall structure of the sewing machine will be schematically explained.

As shown in FIG. 7, the sewing machine main body 21 has a bed section 22.
The main body frame 24 having an arm portion 23 is integrally formed with the main body frame 24, and is placed on a sewing machine table 25.

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

The needle bar 2 is attached to the bed portion 22 as shown in FIG.
A louver base 28 is provided opposite to the needle bar 7, and the louver base 28 and the needle bar 27 are rotated in synchronization. Further, the bed portion 22 is provided with a cutter 29 extending in the front-rear direction, and the cutter 29 and the hammer 30 (see FIG. 7) provided on the main body frame 24 so as to be movable up and down can be used to cut the cutter. A device 31 is configured.

Furthermore, as shown in FIG.
A feed bar 32 having a diameter of 1.a is movably provided, and this feed bar 32 is operated by a drive mechanism (not shown) according to a predetermined operation pattern for eyelet stitching.

A pair of cloth holder plates 33.33 are disposed on the feed table 32 on both the left and right sides of the cutter 29, and the cloth holders are located on the outside of the plates 33.33 and are placed on the feed table cover 3.
4.34 is fixed.

Of the plates 33.33, the right cloth tray has a plate cover 35 fixed to the top surface of the plate 33, and the left cloth tray has a plate cover 35 fixed to it, which also covers the top surface of the plate 33. The receiver moves integrally with the plate 33, and the left cloth receiver can slide against the plate 33. Further, the left and right cloth receivers are provided with cloth pressers 36 and 36 on the plate 33, respectively, so as to be rotatable in the vertical direction via a shaft 55a and an arm portion 55, which will be described later.

The plates 33 and 33 of the cloth receiver are moved in the directions of arrows H1 and H2, and in the directions of arrows I, I2, respectively, by link mechanisms 37 (only one of which is shown in FIGS. 1 and 2). , the presser feet 36, 36 are each rotated by a presser mechanism 38 (only one of which is shown in FIGS. 1 and 3).

In the link mechanism 37 and the presser foot mechanism 38, a pair of left and right cloth receivers are provided separately corresponding to the plate 33 and the cloth presser foot 36, but each structure is symmetrical.

Now, since the pair of link mechanisms 37 are bilaterally symmetrical, in this case, the right link mechanism 37 will be described as a representative. This link mechanism 37 includes a first link 39 and a second link 40.
The first link 39 has an intermediate portion rotatably supported on the feed base 32 by a shaft 41, and a pin at the rear end of the first link 39. 42 is provided to protrude upward, and a pin 43 is provided to protrude downward from the front end. Furthermore, the arm portion 44 extends outward from the intermediate portion.
has been extended. This first link 39 has a solver ratio Ωa: and Qb set to 1:1. The second link 40 is rotatably supported on the feed table 32 by a shaft 45 with its intermediate portion located closer to the front than the first link 39 . A square piece 46 is disposed in an elongated hole 40a formed at the rear end so as to be movable in the front-rear direction, and the first link 3 is attached to this square piece 46.
Nine bins 43 are rotatably connected. Further, a bin 47 is provided at the front end of the second link 40 to protrude upward. The lever ratio La:Lb of this second link 40 is also set to 1:1. Therefore, in this link mechanism 37, the free ends of the bins 42° and 47 on the rear end side and the front end side are The structure is set so that the swing strokes are the same.

The pin 42, which is provided as a connecting portion at the free end of the rear end of the link mechanism 37, is rotatably fitted into a connecting hole 48 formed at the rear end of the plate 33. Further, a bin 47 provided as a connecting portion at the free end on the front end side is rotatably fitted and connected to a square piece 49, and the cloth holder of the square piece 49 is connected to the front end of the plate 33. It is slidably fitted into the formed elongated hole 50. and,
The arm portion 44 of the first link 39 is connected via a joint 52 to a rod 51a of a cloth opening drive body 51, which is an air cylinder and is disposed on the feed table 32 in the front-rear direction. The stoppers 53 and 54 are attached to the feed base 32 with screws 53a and 54a corresponding to the rear and front ends of the first link 39, respectively. Hook holes 53b and 54b are formed at the tips of the stoppers 53 and 54, respectively, and the screws 53a and 54a are exposed to the outside through holes 34a and 34b formed in the feed base cover 34, respectively. There is. Therefore, the position of each stopper 53, 54 can be adjusted by loosening the screws 53a, 54B and fitting an appropriate tool into the hole 53a * 54a and pulling or pushing the hook. .

On the other hand, regarding the presser mechanism 38, in this case the left presser mechanism 3
I will speak on behalf of 8. As shown in FIG.
The arm portion 55 is rotatably supported on the plate 33 via a shaft 55a, and the arm portion 55 has a hole formed in the plate 33 at its base end. The cloth receiver extends to the back side of the plate 33 through the arm portion 5.
6 is formed. A link 57 is rotatably provided on the feed table 32 via a shaft 58 extending left and right, and a bottle 59 attached to one end of the link 57 connects the bone to the arm portion 56. ing.

In this case, the arm portion 56 of the receiver is slidable in the left-right direction with respect to the bin 59. Further, the bottle 60 attached to the other end of the link 57 is connected via a joint 62 to a rod 61a of a presser drive body 61 formed of an air cylinder provided on the feed base 32.

In the above configuration, when eyelet stitching is performed on the work cloth 63 (part of which is shown in FIG. 6), a notch having a round hole portion at the rear end is formed and the cloth is opened. , these will be described.

First, after placing the work cloth 63 on the pair of cloth supports plates 33 and 33, when a start switch (not shown) is turned on, the cloth presser driver 61 operates its rod 61a in the direction of arrow S in FIG. As a result, the presser foot 36 is rotated downward as shown by arrow Q. As a result, the work cloth 63 is pressed down by the cloth presser foot 36. After that, the hammer 30 of the cutter device 31 is rotated toward the cutter 29,
As a result, a cut 64 is formed in the work cloth 63, as shown by the solid line in FIG. 6, and extends in the front-rear direction and has a round hole 64a.

Thereafter, with both sides of the notch 64 of the work cloth 63 pressed by the cloth presser foot 36, the cloth opening drive body 51 moves its rod 5
1a is driven to operate in the direction of arrow S in FIG. 3, thereby rotating the first link 39 in the direction of arrow U.

Then, the second link 40 is interlocked with this, so that the bin 42.47 in the link mechanism 37 swings in the direction of arrow H1, and the plate 33.33 of the cloth receiver slides almost horizontally in the direction of arrow H3. As a result, this cloth tray has a plate of 33°33
are moved away from each other (see Figure 5). As a result, the cut 64 is opened as shown by the two-dot chain line in FIG. In this case, the rear end side of the link 39 of node 1 comes into contact with the stopper 53, thereby stopping movement in the direction of arrow H1. In this state where the cloth is opened, the feed table 32 is operated by a drive mechanism (not shown) according to a predetermined operation pattern for eyelet stitching, and during this operation, the sewing needle 26 is driven up and down while swinging from side to side. The sewing needle 26 is rotated in synchronism with the louver base 28 when the hole 64a of the notch 64 is being stitched, thereby performing the stitching operation.

Note that after the overlocking operation is performed, necessary thread cutting operations, etc. are performed, the presser foot 36 is rotated upward, and the cloth opening drive body 51 is moved from its rod 5.
1a is driven to operate in the direction opposite to the arrow T,
As a result, the first link 39 is rotated in the direction opposite to the direction of arrow U, and the second link 40 is interlocked. As a result, the bins 42, 47 swing in the direction of the arrow H2, and the cloth receiver is moved parallel to the direction in which the plates 33, 33 approach each other, returning to the initial state. In this case, movement in the direction of arrow H2 is stopped by the front end side of the link 39 of the node 1 coming into contact with the stopper 54.

As described above, according to this 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, as well as the bins 42 and 47, which are the connecting parts, are swung with the same stroke. Since the movable link mechanism 37 is provided, the cloth receiver can slide the plates 33, 33 almost sideways.

In this case, the link mechanism 37 is constructed by connecting in the front-rear direction a first link 39 and a second link 40 whose intermediate portions are pivotally supported by the feed base 32 and whose both ends swing. , only requires a small space for arrangement in the left and right direction. In addition, since there is a configuration in which two links 39, 40 are combined in this case, unlike a configuration with two guide bars and slide plates, high parallelism and processing accuracy are not required, and as a result, the configuration is extremely It is simple and can keep production costs low.

In the above embodiment, the lever ratio in the first link 39 and the lever ratio in the second link 40 are set to 1:1, respectively, so that the free ends on the rear end side and the front end side of the link mechanism 37 Although the swing strokes of the two levers are set to be the same, it is possible to set the swing strokes to be the same even if each lever ratio is changed. Further, the number of links in the link mechanism 37 is not limited to two.

[Effects of the Invention] As is clear from the above description, the present invention is constructed by connecting a plurality of links in the front-rear direction, each of which has a middle portion pivotally supported by the feed base and whose both ends swing. A pair of left and right link mechanisms are provided so that the swing strokes of the free ends on the front end side are the same, and each cloth holder is attached to the front end of the plate at the free end on the rear end side and the front end side of each link mechanism. and a rear end portion, and the cloth receiver moves the plate by operating the link mechanism, so the size in the left and right direction can be reduced.
The space occupied by the sewing machine can be reduced, contributing to the downsizing of the sewing machine.Also, since the configuration is just a combination of multiple links, it has high parallelism and processing accuracy, unlike a model with two guide bars and a slide plate. As a result, the configuration is extremely simple and the manufacturing cost can be kept low, which is an excellent effect.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention,
Fig. 1 is a partially cutaway plan view of the feed platform, Fig. 2 is a vertical sectional view of the link mechanism, Fig. 3 is a side view of the presser foot mechanism, and Fig. 4 is a schematic diagram of the feed platform. FIG. 5 is a schematic plan view of the feeding platform portion in a state where the cloth is opened, FIG. 6 is a plan view showing the incisions, and FIG. 7 is a side view showing the overall configuration. FIG. 8 is a plan view of a cloth opening device portion showing a conventional example. In the drawing, 26 is a sewing needle, 28 is a louver base, 29 is a cutter, 30 is a hammer, 31 is a cutter device, 32 is a feed stand, 33 is a cloth holder plate, 36 is a cloth presser foot, 37 is a link mechanism, and 38 is a presser foot mechanism , 39 is a first link, 40 is a second link, 42 is a bottle (connection part), 47 is a pin (connection part), 51 is a cloth opening drive body, 56 is a receiver arm part, 6
1 indicates a presser foot drive body.

Claims (1)

[Claims] 1. A pair of fabric receiving plates provided on the feed stand so as to be positioned on both the left and right sides of the cutter extending in the front-rear direction, and a fabric presser provided on each fabric receiving plate, and the material is placed on both the fabric receiving plates. forming a notch extending back and forth in the cutter, and opening the notch by moving both cloth receiving plates in a direction away from each other with both sides of the notch being pressed by the cloth pressers; In the fabric opening device of the hole sewing machine, the link is constructed by connecting a plurality of links in the front and back direction, each of which has its intermediate portion pivoted on the feed base and swings at both ends, and has free ends on the rear end side and the front end side. A pair of left and right link mechanisms are provided that are set to have the same swing stroke, and the free ends on the rear end side and the front end side of each link mechanism are connected to the front end and rear end of each of the cloth receiving plates, respectively. A cloth opening device for a hole sewing machine, characterized in that the cloth receiving plate is moved by operating the link mechanism.