JPH064116B2 - Baffle forming device for sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] This invention, as shown in FIG. 6, is used when the seams (1) of pants, skirts, etc. are laid and sewn down (2). The folding part (3) of the sewing machine is always guided automatically to a position separated from the sewing machine needle by a certain dimension so that the bind-off stitch (2) is formed in parallel along the bending part (3) of the joint sewing part. The present invention relates to a binding stitch forming device in a sewing machine.

[Conventional technology]

Conventionally, this bind-off sewing work is generally performed manually, and as shown in FIG.
Fold the seam allowance (G) of (1), then insert the sewn seam (1) obtained by bending the seam allowance (G) under the ruler presser foot of the sewing machine, and the left and right cloths (M) (M) Lightly stretch to spread.
Then, after lowering the ruler cloth presser foot on this seam,
Bending part of the sewn joint part (1) while stretching the left and right fabrics by hand
It is a completely manual sewing that the sewing machine is sewn while guiding (3) according to the ruler of the presser foot.

As a device for guiding the joint sewing portion, there is a device for automatically guiding the bent portion (3) of the joint sewing portion (1) to a position separated from the sewing machine needle by a certain dimension. First
As shown in FIG. 10, in front of the sewing machine needle (5), the upper surface faces the right front and the lower surface faces a large number of V grooves (41) (42) parallel to the left front.
And a plurality of parallel V-grooves (4) in the same direction as the V-grooves (41) on the upper surface of the middle guide-plate (40).
4) is formed on the lower surface, and an upper guide plate (43) having a protrusion (45) for guiding the bent portion (3) of the sewn joint portion (1) on its side is provided so as to be vertically movable, and, On the lower surface of the middle guide plate (40), there are many parallel V grooves (47) in the same direction as the V grooves (42).
Is provided on the upper surface of the lower guide plate (46), and the seam allowance (G) of the joint sewing portion is provided on the lower surface of the middle guide plate (40) and the lower guide plate (46).
The upper right fabric (M) is sandwiched by the upper faces of the upper guide plate and the left end of the middle guide plate (40) as a guide, and the upper face of the middle guide plate (40) and the lower face of the upper guide plate (43) are horizontally extended in a U-shape. , On the other hand, the lower left fabric
(M) is arranged as it is by extending the space between the upper surface of the lower guide plate (46) and the lower end of the protrusion (45) to the left, and by the cloth feeding by the sewing machine, the above-mentioned facing left or right V-grooves are formed. Inducing action causes the cloth to move forward while being stretched from side to side.

At this time, the folding part (3) of the right fabric (M) folded upward from the joint seam of both fabrics is moved to the left, and the fabric is fed by bringing it into contact with the inner surface of the protrusion (45). Sew in place in parallel at a certain distance from the part (3)
(2) was formed.

[Problems to be solved by the invention]

Therefore, the manual work as described above requires skill, requires more work time, and is high in production cost.

Further, the above conventional device has the following drawbacks.

Put the fabric of the seam (1) through the middle guide plate (40) to the upper guide plate (4
3) and the lower guide plate (46) are brought into pressure contact with each other, the fabric is fed by the sewing machine in that state, and the V provided on the upper and lower surfaces of the guide plate.
Since the cloth (M) (M) is moved while being stretched left and right by the guiding action of the grooves (41) (42) (44) (47), the cloth is sewn up in the stretched state, and therefore the bottom stitch (2) The sewn line part of the becomes a meandering wave.

[Means for solving problems]

The present invention has solved the above-mentioned problems, and as shown in Figs. 3 and 5, a slightly rotating guide roller (28) (28) is provided on both diagonally front both sides of the sewing portion (4) of the sewing machine. This roller (28) is provided by facing the cloth surface facing outward and moving the cloth.
By rotating (28), the fabric is stretched to the left and right with almost no resistance.

That is, the gist of the device of the present invention is to provide a base plate (12) so as to be movable left and right in front of the sewing machine stitching part (4) in the cloth feeding direction, and to attach the base plate (12) to the upper surface of the base plate (12). A guide ruler (13) with a T-shaped cross section is provided with horizontal portions (14) and (14) for holding the seam allowance (G) of the sewn portion with a certain gap between the upper surface of the sewing machine and the arm of the sewing machine. A vertical guide plate (35) is provided in the lower part of a moving block (21) movably provided on the side of the guide plate (35) close to the outer side of the guide ruler (13). A guide roller (28) (28) capable of changing direction on both left and right sides is provided so as to be vertically movable, and the base plate (12) and the moving block (21) are relatively movable left and right. It is a binding stitch forming device in a sewing machine.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 (40) is a known flat bed double chain stitch sewing machine, the main part of which is a stitching part (4) which has two needles (5) and (5) that move up and down.
And a needle plate (6) having a needle hole formed directly below the sled needle, and a freely movable up and down presser foot (7) that is engaged with the needle plate (6) and is spring-loaded. A cloth feed tooth (8) that engages with the lower surface of the cloth presser foot (7) and moves in and out from the upper surface of the needle plate (6), and the cloth placed on the needle plate (6) Press the cloth with the presser foot (7), then move the needles (5) and (5) up and down to sew the cloth and move the cloth feed dog (8) into a circular motion to move the cloth in front of the sewing machine (direction of arrow A). By transferring the material to the cloth, stitches are continuously formed on the cloth.

In front of the sutured portion (4), as shown in FIGS. 1 and 2, the bent portion (3) of the sewn joint portion (1) is provided with sewing machine needles (5) (5).
An upper guide mechanism (20) and a lower guide mechanism (10) are provided for guiding to a predetermined position apart from the above by the upper and lower guide mechanisms (20) and (10) as shown in FIG. Pneumatic pressure is applied so that the seam allowance (G) of the sewn seam (1) can be bent to the right to sew down (2) and to fold to the left to sew down (2) as shown in FIG. It is configured such that it can be moved left and right (in the direction of arrow B) with respect to the sewing needles (5) and (5) by driving the cylinder.

Then, the upper and lower guide mechanisms (20) (10) are
Explaining from (10), as shown in FIGS. 1 and 2, a movable base plate (12) configured to be horizontally movable left and right by driving a pneumatic cylinder (11) fixed to the front side of the sewing machine bed (41). ) Is provided in front of the cloth presser foot (7) of the sewing machine, and a T-shaped cloth guide ruler (13) long in the front-rear direction is arranged in the center of the movable base plate (12) along the cloth feed direction. Move the ruler (13) to the right (arrow D) as shown in FIG.
Direction), the left end of the left horizontal part (14) of the guide ruler (13) is located about 1 mm left from the sewing machine needle (5), while the moving base plate (12) is shown in FIG. When it is moved to the left (direction of arrow E), the right end of the right horizontal portion (14) of the guide ruler (13) is provided about 1 mm to the right of the sewing machine needle (5).

Further, the left and right ends of the explanation moving base plate (12) are provided with the first and second
As shown in the figure, the spring bearing plates (16) (1) with each tip protruding to just below the left and right horizontal parts (14) (14) of the guide ruler (13)
6) is provided, and as shown in FIGS. 3 and 4, the spring receiving plates (16), (16) have the seam allowance (G) of the sewn seam portion at the horizontal portions (14), (14) of the guide ruler (13). ), The seam allowance (G) is lowered according to the thickness of the seam allowance (G), and the seam allowance (G) is lightly sandwiched between the horizontal parts (14) and (14). The front portion of the spring bearing plates (16) (16) is bent downward as shown in FIG. The sewn fabric is made to flow smoothly.

On the other hand, an upper guide mechanism (20) is provided above the lower guide mechanism (10) as shown in FIGS. 1 and 2, and the upper guide mechanism (20) is attached to the sewing machine arm (42). A moving block (21) configured to be movable up and down (direction of arrow C) and left and right (direction of arrow B) by driving a pneumatic cylinder (not shown) provided directly above the guide ruler (13). Placed,
Bearing feet (24) (24) are provided at the front of the moving block (21) via vertical shafts (23) (23). And this bearing foot
(24) The lower end of (24) is provided with swing levers (26) and (26) via rotatable horizontal shafts (25) and (25), and these swing levers (26) and (26) The guide roller (28) (2) that can freely rotate in the cloth feed direction of the sewing machine is provided at the lower end of the sewing machine through the horizontal rotary shaft (27) (27).
8) is provided. And this guide roller (28) (2
In 8), the outer periphery is baked and coated with urethane rubber so as to increase the frictional force, and normally the tension springs (29) (29) are stretched between the rear ends of the bearing feet (26) (26). Is urged downward by the action of.

In addition, the guide rollers (28) (28) are the moving blocks (21).
Is moved to the left, as shown in FIG. 3, the lower guide mechanism
It is located above the spring bearing (16) on the left side of (10) and the guide ruler (13), and when the moving block (21) moves to the right, as shown in FIG. Guide ruler (13) and right spring bearing (1
The guide rollers (28) and (28) are oriented so that they are located above the vertical shafts (23) and (23), respectively, as shown in FIG. The guide rollers (28) (28) are set so that they are tilted to
When (21) is lowered, as shown in FIG. 3, the spring retainer (16) and the left and right cloths (M) (M) of the mating stitches set on the upper surface of the guide ruler (28) are lightly contacted, and the sewing machine is sewn. When the cloth moves due to the cloth feed, the cloth moves right and left due to the movement of the cloth, and the cloth on the left and right (M) (M) that contacts the guide rollers (28) (28)
Are guided outward by the frictional force of the rollers.

In the figure, (30) (30) is a set screw fixing the vertical shafts (23) (23), and by loosening the screws (30) (30) and turning the vertical shafts (23) (23). The direction of the guide rollers 28, 28 can be changed.

Further, as shown in FIGS. 1 and 2, the guide roller (2
8) A guide plate (35) for linearly moving the bent portion (3) of the sewn joint portion (1) is arranged on the intermediate side of (28),
The guide plate (35) is fixed to the lower end of the spring plate (36) hanging from the rear part of the moving block (21), and the front end thereof is a sewn portion.
The fabric of (1) is chamfered diagonally downward so that it does not get caught.

When the moving block (21) is moved to the left, the guide plate (35) has a left horizontal portion (14) of the guide ruler (13) of the lower guide mechanism (10) as shown in FIG. When the moving block (21) is moved to the right, it is arranged so as to descend to a position separated by about 1 mm from the right horizontal part (14) end of the guide ruler (13) as shown in FIG. It is arranged to descend to a position 1 mm away.

In the embodiment of the sewing machine of the present invention, the operation of the above-described structure is performed by driving the pneumatic cylinder, and the operation sequence is controlled by sequence control.

In addition, in this embodiment, the orientation of the guide rollers (28) (28) is provided so as to be inclined outward, but the orientation of the guide rollers (28) (28) should be set according to the properties of the fabric used. Needless to say.

In general, the angle should be smaller for soft fabrics and larger for hard fabrics.

Further, in this embodiment, the guide plate (35) is lowered to a position about 1 mm away from the ends of the horizontal portions (14) and (14) of the guide ruler (13), and the bent portion (3) of the sewn joint portion (1) is removed. I set it up as a guide,
It goes without saying that this gap can be set arbitrarily depending on the thickness of the fabric used.

In addition, in the present embodiment, in order to perform symmetrical bottom stitching like pants, the seam allowance (G) of the left and right side-to-side seams (1)
The upper and lower guide mechanisms (10) and (20) were moved relatively to the left and right so that they could be bent on the left and right alternately and set on the sewing machine.
In the case where (G) is bent and sewn down only in one direction, the upper and lower guide mechanisms (10) and (20) do not need to be movable and only need to be in one direction.

[Action]

This embodiment will be described by applying it to the bind-off sewing work of the side-by-side sewing part of the pants.First, the worker firstly presses the work clamp foot (7) of the sewing machine.
Raise and fold the seam allowance (G) of one of the sewn trousers as shown in FIG. 3, slide it under the left horizontal part (14) of the guide ruler (13), and remove the cloth (M) (M ) Lightly spread to the left and right. Then, as shown in FIG. 5, the bent portion of the joint sewing portion (1)
While guiding (3) to the end of the left horizontal part (14) of the guide ruler (13), advance it in the cloth feed direction (direction of arrow A) of the sewing machine to bring the sewing start end to the bottom of the sewing machine needle (5) (5). Transfer.

Then, the presser foot (7) is lowered to press the sewing start end under the needles (5) and (5). Next, when the sewing machine is started, a pneumatic cylinder (not shown) is driven to move the moving block (2
The guide rollers (28) and (28) are lowered together with 1), and the cloth is spread on the left spring receiving plate (16) and the guide ruler (13) of the lower guide mechanism (10) as shown in FIG. (M) Lightly touching (M), the guide plate (35) is also lowered at the same time, and the bent portion of the seam
Grip (3) lightly with the end of the left horizontal part (14) of the guide ruler (13).

Next, the two needles (5) and (5) move up and down, the cloth feed dog (8) is driven, and as shown in FIG. 5, the sewing machine sewing is started from the sewing start end of the joint sewing portion (1) at the same time. The cloth of the seam (1) is sent to the front of the sewing machine (direction of arrow A), and the guide roller (28)
(28) also starts to turn. Then, on the left fabric (M), a force that guides the fabric to the left front direction is generated by the rotation of the guide roller (28) in the front left direction, while on the right fabric (M), the right of the guide roller (28) is generated. The forward rotation produces a force that guides the fabric to the front right direction. As a result of this action, as shown in FIGS. 3 and 5, the bent portion (3) moves to the left (in the direction of arrow F) until it comes into contact with the guide plate (35), and this action is accompanied by the cloth feed of the sewing machine. The folds (3) of the sewn portion are straightened along the guide plate (35) by continuously maintaining
(5) Proceed to (5).

Then, while the sewing machine is operating, the bending portion (3) of the sewn stitching portion (1) fed below the presser foot (7) of the sewing machine is always separated from the sewing needle (5) (5) by a certain dimension. Will be guided to the position,
A seam is formed parallel to the bent portion (3) in the joint sewing portion that has passed through the sewing needles (5) and (5).

Next, the worker stops the sewing machine and
Raise (21) to raise the guide rollers (28) (28) and the guide plate (35). Then, the moving block (21) is moved to the right, and at the same time, the moving base plate (12) is also moved to the left.

Next, the operator slides the seam allowance (G) of the other matching sewing portion of the pants under the right horizontal portion (14) of the guide ruler (13) as shown in FIG. Set it on the sewing machine,
By starting the sewing machine, the guide work from the direction symmetrical to the above work is repeated and the side stitches are joined together.
Form a seam parallel to the bent portion (3) of (1).

Next, the worker sets the side stitching part of the new pants on the sewing machine in the same manner as above, and repeats the above-mentioned work by starting the sewing machine, and automatically along the folding part (3) of the side stitching. Form parallel sewn seams (2).

〔The invention's effect〕

In the present invention, the guide roller having a large frictional force is brought into contact with the surface of the cloth lightly and rotatably, and by the rotation of the guide roller accompanying the feeding movement of the cloth, the outward pulling is performed without applying a force for extending the bind-off sewing portion. Can give power.

Therefore, even in the case of a soft cloth, stretch does not occur and it is possible to perform parallel beautiful seams.

Further, in the present invention, the base plate (12) provided with the T-shaped guide ruler (13) and the moving block (21) provided with the guide plate (35) and the guide rollers (28) (28) are mutually provided. Since it is configured to be moved relative to each other, it is possible to easily cope with any of the left and right bind-off stitches (2).

[Brief description of drawings]

FIG. 1 is a front view of a state in which the device of the present invention is attached to a known industrial sewing machine, FIG. 2 is a left side view of FIG. 1, and FIGS. 3 and 4 are operating modes of the upper and lower guide mechanisms of the present invention. FIG. 5 is a plan view of FIG. 3, FIG. 6 is a plan view of FIG. 3, FIG. 6 is a side view of trousers with side stitching seams sewn down, and FIGS. FIG. 9 is an explanatory view showing a form, FIG. 9 is a plan view showing an operating state of a conventional cloth guide device, and FIG. 10 is a ZZ sectional view of FIG. In the figure, (4) is a sewing machine suture portion, (12) is a moving base plate, (13)
Is a guide ruler, (28) is a guide roller, and (35) is a guide plate.

Claims (1)

[Claims] 1. A base plate (12) is movably provided in front of the sewing machine stitching part (4) in the cloth feeding direction, and the upper surface of the base plate (12) and the upper surface of the base plate (12). Horizontal part (14) that holds the seam allowance (G) of the mating seam with a certain gap between
A guide ruler (13) having a T-shaped cross section provided with (14) is provided, while a vertical guide plate (35) is provided below a moving block (21) provided on the arm side of the sewing machine so as to be vertically and horizontally movable. ) Is provided close to the outer side of the guide ruler (13) and the guide plate
Guide rollers (28) and (28) capable of changing direction are provided on both left and right sides of (35) so as to be vertically movable, and the base plate (12) and the moving block (2
1) An apparatus for forming a bottom stitch in a sewing machine, characterized in that the and can be moved relative to each other.