JPH07116370A - Blind stitching feed device with sewing machine - Google Patents

Abstract

PURPOSE:To prevent a cloth damage and stabilize a blind stitching position by moving cloth in a cloth feed direction according to a blind stitching pitch, and dislocating the whole of the cloth or a part of cloth return section by the prescribed amount along a direction orthogonal with the cloth feed direction, interlocked with the motion of the cloth along the feed direction. CONSTITUTION:Cloth 8 is positioned and pressed with a cloth presser, with the return section thereof inserted between upper transfer belts 21a and 21b, and lower transfer belts 22a and 22b. Also, the upper transfer belts 21a and 21b are lowered on the operation of a vertical drive device 14, and clamped among the vertical transfer belts 21a to 22b. Furthermore, a belt drive motor 16 is operated to cause the travel of the belts 21a to 22b, thereby moving the cloth 8 in a cloth feed direction by a distance corresponding to the preset stitching pitch. Concurrently, a transverse motion drive device 11 is actuated to move right the first slide base 9 including the belts 21a and 21b, and a lower transverse motion drive device 26 is actuated to move right a support 25 including the belts 22a and 22b respectively by the same distance. Then, an upper needlebar 4 and a lower needlebar 6 are operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine for a sewing machine, and more particularly, to a sewing machine including a cuff, a hem, and a side of a Japanese-styled cloth for sewing a folded-back portion of a cloth. Of the feeding device for moving the dough so as to alternately penetrate the dough.

[0002]

2. Description of the Related Art The cuffs, hem, etc. of Japanese-style fittings are subjected to combing (festival stitching) so that they do not float up. Conventionally, it is general to manually sew a folded portion of such a cloth by hand. In addition, a method of performing combing stitches using a sewn stitch sewing machine is also known.

[0003]

However, in the case of manually performing the sewn stitch, an engineer skilled in the sewn stitches is required, and the sewn stitch work takes time, resulting in variations in the stitches. There is a problem that the quality is not constant. Also, when combing is sewn using a sewn sewing machine, the material is sewn while scooping the material by hooking the needle on the material, which may cause the ground thread of the material to be sewn to break or threading. Had the problem of damaging.

The present invention solves the above-mentioned problems, and provides a barb stitching feed device for a sewing machine, which can obtain a sewn-free combed stitch with a stable sewing position without damaging the material. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, the present invention is to move an upper needle bar provided in a sewing machine head and a lower needle bar provided in a sewing machine bed up and down in cooperation with each other to A sewing machine for forming a hand-sewn seam by alternately penetrating needles of a book from top to bottom and from bottom to top, wherein the sewing machine head is provided to be movable up and down and the needle penetration position of the sewing machine head. A fabric presser that gently presses the fabric set from above, a pair of upper feed belts that are arranged on both sides of the fabric presser so as to run along the fabric feed direction and press the fabric from the top, and the sewing machine head side A pair of lower feed belts arranged opposite to the upper feed belt so as to be able to run along the material feed direction and pressing the material from the lower surface, and a drive for driving the upper feed belt and the lower feed belt in the material feed direction. And means for interlacing the material held by the upper feed belt and the lower feed belt when the needle is above or below the material and feeding the material by a predetermined stitch pitch by the driving means. A fabric lateral feeding means for shifting the whole or a part of the fabric folding portion by a predetermined amount in the direction orthogonal to the fabric feeding direction to change the penetration position of the needle with respect to the fabric from top to bottom and from bottom to top. did.

[0006]

In the present invention, when the needle is above or below the material, the material held by the upper feed belt and the lower feed belt is moved in the material feed direction according to the stitch pitch of the comb stitch, and By operating the fabric lateral feed means in conjunction with the feeding operation, the entire held fabric or a part of the fabric folding portion is displaced by a predetermined amount in the direction orthogonal to the fabric feeding direction, so that the needle is either the upper needle bar or the lower portion. The needle bar changes the penetration position for the fabric when penetrating the fabric from the top to the bottom or from the bottom to the top, which allows the needle to alternately penetrate the fabric folding portion and the other fabric portion for each stitch. It becomes possible to sew the folded back part of the cloth.

[0007]

【Example】

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a rear view showing a schematic structure of a hand-sewn type hand-stitch sewing machine provided with a comb-sewn feeding device of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an enlarged side view showing essential parts thereof.

1 to 3, reference numeral 1 is a hand stitch sewing machine having a hand-sewn sewing type, and a sewing machine head 2
And a sewing machine bed 3. The sewing machine head 2 has
The upper needle bar 4 and the material presser bar 5 are provided so as to be vertically movable, and the sewing machine bed 3 side is provided with a lower needle bar 6 whose axis is aligned with that of the upper needle bar 4 so as to be vertically movable.

The upper needle bar 4 moves up and down,
The needle 7 held by itself is passed from top to bottom through the cloth 8 and delivered to the lower needle bar 6, and the lower needle bar 6 is
By the vertical movement, the received needle 7 can be passed from the bottom to the top to penetrate the cloth 8 and be delivered to the upper needle bar 4.

At the lower end of the material presser bar 5, a material presser 5a for lightly pressing the material 8 located at the needle drop portion (not shown) provided on the upper surface of the sewing machine bed 3 from the upper surface is attached.

The needle bar mechanism as described above is a known technique in a hand stitch sewing machine, and detailed description of its structure will be omitted. The needle 7 used in the needle bar mechanism is
As shown in FIG. 4, both ends thereof have a sharp structure capable of smoothly penetrating the fabric 8, and a needle hole 7a through which a thread is passed is formed in the middle portion of the needle 7.

In FIGS. 1 and 3, reference numeral 9 is a first slide base for material feeding provided on the back surface of the sewing machine head 2 via a guide 10 so as to be movable in the horizontal direction. It is moved in the horizontal direction by an upper lateral swing drive device 11 which is an air cylinder or a motor attached to the back surface of the sewing machine head 2.

A second slide base 12 is attached to the first slide base 9 via a guide 13 so as to be vertically movable.
Is vertically moved by an up-and-down drive device 14 including an air cylinder or a motor attached to the first slide base 9.

At the lower end of the second slide base 12,
A belt support 15 projecting to the side of the material presser 5a is fixed, and further, on the back surface of the second slide base 12,
A belt drive motor 16 including a stepping motor or the like is installed.

The belt support 15 has a pair of substantially L-shaped pulley support members 15a, 15b which are located on the right and left sides of the material presser 5a and extend parallel to the feeding direction of the material 8, and the pulley support member 15a. , 15b is close to the upper surface of the sewing machine bed 3 as shown in FIG.
Between the horizontal portions of the pulley supporting members 15a and 15b, the driven pulley 17 and the intermediate pulley 18 are located at both ends in the fabric feeding direction (longitudinal direction of the horizontal portion) so that their rotation axes are orthogonal to the fabric feeding direction. Is rotatably supported, and the intermediate pulley 19 is rotatably supported between the vertical portions of the pulley supporting members 15a and 15b, being located above the intermediate pulley 18.

A drive pulley 20 is fixed to a rotary shaft 16a protruding from the belt drive motor 16 in parallel with the pulleys. Intermediate pulleys 18 and 19 are interposed between the drive pulley 20 and the driven pulley 17. A pair of endless upper feed belts 21a and 21b are wound around in a tensioned state, and the upper feed belts 21a and 21b are separated from each other by sandwiching the material presser 5a.

When the second slide base 12 is at the lower end position, the horizontal portions of the upper feed belts 21a and 21b wound around the driven pulley 17 and the intermediate pulley 18 press the cloth 8 from above.

1 to 3, reference numerals 22a and 22b denote a pair of endless lower feed belts disposed in parallel in the sewing machine bed 3 so as to face the horizontal portions of the upper feed belts 21a and 21b. The lower feed belts 22a and 22b are wound around a pair of driven pulleys 23 and 24 arranged in a direction orthogonal to the cloth feeding direction in a tensioned state, and the driven pulleys 23 and 24 are arranged inside the sewing machine bed 3 to form a cloth. A lower part which is axially supported by a support body 25 which moves in a direction orthogonal to the feed direction, and which is composed of an air cylinder or a motor which is simultaneously controlled in synchronization with the lateral swing drive device 11 of the first slide base 9. A lateral swing drive device 26 is connected. The lower feed belts 22a, 2
The material contacting side of 2b is arranged to slightly project from the upper surface of the sewing machine bed 3.

Next, the operation of the first embodiment constructed as described above will be explained. As shown in FIG. 5, the dough 8
When the folded back portion 8c of the cloth 8a is to be sewn after the edges of a and 8b are sewn together, first, a knee lever (not shown) is operated to raise the cloth pressing bar 5, and further,
By driving the up-and-down drive device 14 that interlocks with this, the second slide base 12 including the upper feed belts 21a and 21b is raised. In this state, the cloth 8 having the folded-back portion 8c shown in FIG.
Insert in between. Then, as shown by the chain double-dashed line in FIG.
Edge 8c ₁ of the folded portions 8c positions the fabric 8 to the state that coincides with the center line L of the needle elongated hole 5b of the fabric presser 5a.

After that, by releasing the operating force applied to the knee lever, the material pressing bar 5 is lowered, and the material 8 is lightly pressed from the upper surface by the material pressing 5a. At the same time, the vertical driving device 14 is operated to operate the upper feed belt 21.
The entire second slide base 12 including a and 21b is lowered, and the cloth 8 is pressed from the upper surface by the horizontal portions of the upper feed belts 21a and 21b. As a result, the upper feed belt 21a,
21b and the lower feed belts 22a and 22b hold the fabric 8 located on both the left and right sides of the fabric retainer 5a from both upper and lower sides.

In this state, when a foot petal (not shown) is stepped on, a start switch (not shown) is turned on, the belt drive motor 16 is started, and the feed belts 21a and 21b are also activated.
By running, the fabric 8 held by the upper and lower feed belts is moved in the fabric feed direction by a preset stitch pitch. At the same time, the lateral swing drive device 11 operates to move the entire first slide base 9 including the upper feed belts 21a and 21b to the right in FIG. 1 by a predetermined amount, and the lower lateral shake drive device 26 also operates. Feed belts 22a, 2
The support 25 including 2b is moved to the right in FIG. 1 by the same amount.

As a result, the upper feed belts 21a and 21b
And the cloth 8 held by the lower feed belts 22a and 22b,
The edge portion 8c ₁ of the folded-back portion 8c is centered in FIG.
Is moved to the right by a predetermined amount. At this time, the penetration position of the needle 7 with respect to the cloth 8 is a position slightly over the edge portion 8c ₁ of the folded portion 8c shown by the white circle P1 in FIG.

When the lateral swinging motion of the feed belt is completed, the sewing machine motor (not shown) is driven to move the upper needle bar 4 downward, and at the same time, the lower needle bar 6 is lifted and held by the upper needle bar 4. The threaded needle 7 penetrates the edge portion 8c ₁ of the cloth folded portion 8c corresponding to the white circle P1 from top to bottom. The needle 7 penetrating the material 8 is transferred to the lower needle bar 6, and the needle 7 is completely pulled out from the material 8 by the lower needle bar 6 descending operation, and the thread is pulled out below the material 8. At this time, the upper needle bar 4 is rising.

When the lower needle bar 6 which has received the needle 7 reaches the lower end, the belt drive motor 16 is activated and the upper feed belts 21a and 21b are made to travel, whereby the material 8 held by the upper and lower feed belts is preliminarily held. Move in the feed direction by the set stitch pitch. At the same time, by driving the lateral swing driving devices 11 and 26, the cloth 8 held between the upper and lower feed belts 21a, 21b and 22a, 22b is moved to the left in FIG. 5 by a predetermined amount.
As a result, the penetration position of the needle 7 with respect to the cloth 8 is made to face the cloth 8b which is out of the folded portion 8c shown by the black circle P2 in FIG.

When the above-mentioned material feeding is completed, the lower needle bar 6 is raised, and the threaded needle 7 held by the lower needle bar 6 penetrates the material 8b corresponding to a black circle from the bottom to the top. The needle 7 penetrating the fabric 8b is transferred to the descending upper needle bar 4, and as the upper needle bar 4 rises, the needle 7 is completely removed from the fabric 8b, and the thread is pulled out above the fabric 8b. At this time, the lower needle bar 6 is descending. Hereinafter, by repeating the above-described series of operations, the cloth folded portion 8c can be automatically combed and sewn.

FIG. 5 is an explanatory view showing the stitches of the comb stitch at this time, the solid line shows the stitches appearing on the surface,
The broken line is the seam that appears on the back side.

FIG. 6 is an enlarged schematic view showing the stitches of the comb stitch shown in FIG. 5, and the vertical arrow indicates the penetrating direction of the needle 7. Further, the stitch pitch on the front side of the fabric is large and the stitch pitch on the back side of the fabric is small.

The feed amount required for combing is 15 to 3
It is 0 mm, and this feed amount can be easily realized by the belt feed mechanism.

In the first embodiment, the upper feed belt 21 driven by the belt drive motor 16 is used.
a and 21b, and lower feed belts 22a and 22b that follow the upper feed belt, hold the fabric 8 from both upper and lower sides and move it in the fabric feed direction in accordance with the stitch pitch of the comb stitch. Upper and lower feed belts 21a, 2
1b and 22a, the 22b, by a predetermined amount of movement to the left or right around the edge 8c ₁ of fabric folded portion 8c, edges 8c ₁ folded through position of the needle 7 when penetrating from top to bottom Is set and the penetrating position of the needle 7 when penetrating from the bottom to the top is set to a portion deviating from the folding edge portion 8c ₁ , so that the known hand-stitch sewing machine is used for the comb stitching of the cloth folding portion 8c. It is easy to use and can be done without damaging the fabric.

Further, by sandwiching and feeding the fabric 8 with the vertical feed belt, the fabric 8 can be maintained in a tensioned state,
Along with this, it is possible to stabilize the sewn position and obtain a dented seam that does not have a twist, and even a person who is not skilled in sewn stitches can efficiently produce a product of stable quality.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 7 and 8, the difference from the first embodiment is that the first slide base 9 of the upper feed belts 21a and 21b in the first embodiment is different.
And the lateral swing drive device 11 thereof and the lateral swing drive device 26 of the lower feed belts 22a and 22b are omitted, and the base of the material pressing lever 30 is provided on the lower surface of the front portion of the material presser 5a of the material presser bar 5. It is provided so as to be swingable in a horizontal direction perpendicular to the feeding direction (direction of arrow A) of the cloth 8 by the pin 31, and the protruding portion 30a protruding from the base of the cloth pressing lever 30 to the outside of the cloth presser 5a is provided. A movable portion 32a of a lever driving device 32 including a plunger, an air cylinder, or the like is connected, and the lever driving device 32 itself is horizontally fixed to the material pressing rod 5.

The other constituent elements are the same as those in the first embodiment. In the second embodiment having the above-mentioned structure, the cloth 8 having the cloth folded-back portion 8c is set on the sewing machine bed 3 under the cloth presser 5a, and the foot pedal is depressed to turn on the start switch (not shown). Then, the material presser 5a descends to the position where it is lightly contacted with the material 8, and the vertical drive device 14 (see FIG. 1) descends to move the second slide base 1 including the upper feed belts 21a and 21b.
The whole 2 descends, and the fabric 8 is fed to the upper feed belts 21a and 21b.
And it is held from both upper and lower sides by the lower feed belts 22a and 22b. Then, the sewing machine motor (not shown) is driven to start the comb stitching.

When the needle 7 is located on the lower needle bar 6 side, the lever driving device 32 is interlocked with the raising operation of the lower needle bar 6.
Is operated and the movable part 32a is contracted,
The dough pressing lever 30 is rotated about the pin 31 in the direction of arrow B in FIG. Along with this, the swinging tip of the material pressing lever 30 pushes the edge portion 8a ₁ of the material folding back portion 8c corresponding to the needle drop position 40 in the direction of arrow C in FIG. No as a result,
The needle 7 that rises as the lower needle bar 6 rises passes through the material 8b at the position indicated by the black circle S1 in FIG. 9 from the bottom to the top, and is delivered to the upper needle bar 4 that descends. And the upper needle bar 4
The needle 7 is completely pulled out from the cloth 8b and the thread is pulled out above the cloth 8b in accordance with the ascending operation of. At this time, the lower needle bar 6 is descending.

When the upper needle bar 4 receiving the needle 7 reaches the rising end, the lever driving device 32 operates to move the movable part 3 thereof.
By extending 2a, the material pressing lever 30 is returned to the original position. Next, the belt driving device 16 is activated, and the upper feed belts 21a and 21b are run to move the fabric 8 held by the upper and lower feed belts in the fabric feed direction by a preset stitch pitch.

When the above-mentioned material feeding is completed, the upper needle bar 4 is moved downward, and the needle 7 with a thread held by the upper needle bar 4 is lowered, so that the needle 7 is moved to the position shown by the white circle in FIG. The edge portion 8c ₁ of the folded back portion 8c of the cloth is passed from the top to the bottom, and is transferred to the lower needle bar 6 that moves upward. And
As the lower needle bar 6 descends, the needle 7 is completely pulled out below the fabric 8, and the thread is also pulled out below the fabric 8. At this time, the upper needle bar 4 is rising.

When the lower needle bar 6 reaches the lower end, the belt drive motor 16 is activated again and the upper feed belts 21a, 21
b is run, whereby the material 8 held by the upper and lower feed belts is moved in the feeding direction by a preset stitch pitch. After that, the lower needle bar 6 moves up again, and by repeating the above series of operations, the cloth folding back portion 8c
Can be automatically combed with the stitches shown in FIG.

In the second embodiment as described above, the same effect as in the first embodiment can be obtained, although the dough feeding method is different. The present invention is not limited to the configuration shown in the above embodiment, and various modifications can be made without departing from the scope described in the claims.

[0038]

As described above, according to the present invention, one needle is moved by vertically moving the upper needle bar provided in the sewing machine head and the lower needle bar provided in the sewing machine bed in an interlocking manner. A sewing machine that forms a hand-sewn seam by alternately penetrating the material from top to bottom and from bottom to top, provided on the sewing machine head so as to be movable up and down, and set at a needle penetration position of the sewing machine head. A material presser for lightly pressing the material from the upper surface, a pair of upper feed belts arranged on both sides of the material presser so as to be movable along the material feed direction and pressing the material from the upper surface, and the upper feed belt on the sewing machine head side. A pair of lower feed belts facing each other and arranged to run along the fabric feed direction and pressing the fabric from the lower surface; drive means for driving the upper feed belt and the lower feed belt in the fabric feed direction; The whole material or the cloth folded portion which is sewn interlockingly with the cloth held by the upper feed belt and the lower feed belt by a predetermined stitch pitch by the driving means when is above or below the cloth. The upper needle is configured so that a part of the needle is shifted by a predetermined amount in a direction orthogonal to the fabric feeding direction to change the penetration position of the needle with respect to the fabric from top to bottom and from bottom to top. When the needle and the lower needle bar move up and down in conjunction with each other, the folded portion of the material can be automatically sewn each time the needle penetrates the material and is alternately passed between the upper and lower needle bars. Along with this, the well-known hand stitch sewing machine can be used to easily sew the cuffs and other folded-back portions of Japanese-style clothing, and even if you are not experienced in sewn stitching, the quality is stable. Products can be produced efficiently.

[Brief description of drawings]

FIG. 1 is a rear view showing a schematic configuration of a hand stitch sewing machine including a combing feed device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a schematic configuration of a sewing machine according to the first embodiment.

FIG. 3 is an enlarged side view of a main part in the first embodiment.

FIG. 4 is a front view of the needle according to the first embodiment.

FIG. 5 is an explanatory diagram showing a comb-sewn state of the cloth according to the first embodiment.

FIG. 6 is an explanatory diagram showing, in an enlarged manner, the stitches of the comb stitch according to the first embodiment.

FIG. 7 is a schematic configuration diagram of a comb stitch sewing machine showing a second embodiment of the present invention.

FIG. 8 is a plan view of a material pressing portion taken along line VIII-VIII in FIG.

FIG. 9 is an explanatory diagram showing a comb-sewn state of a cloth according to a second embodiment.

[Explanation of symbols]

 1 Hand stitch sewing machine 2 Sewing machine head 3 Sewing machine bed 4 Upper needle bar 5 Fabric presser bar 5a Fabric presser 6 Lower needle bar 7 Needle 8 Fabric 8c Folding part 9 First slide base 11 Upper lateral swing drive device 12 Second slide base 14 Up and down Drive device 16 Belt drive motor (driving means) 21a, 21b Upper feed belt 22a, 22b Lower feed belt 26 Lower lateral swing drive device 30 Material pushing lever 32 Lever drive device

Claims (1)

[Claims] 1. An upper needle bar provided in a sewing machine head and a lower needle bar provided in a sewing machine bed are moved up and down in conjunction with each other, so that one needle is moved from top to bottom and bottom to top of the cloth. A sewing machine which is alternately pierced to form a hand-sewn seam, which is provided on the sewing machine head so as to be vertically movable, and a cloth presser for lightly pressing the cloth set at the needle penetration position of the sewing machine head from above, A pair of upper feed belts arranged on both sides of the material presser so as to be able to run along the material feed direction and pressing the material from the upper surface, and capable of running along the material feed direction facing the upper feed belt on the sewing machine head side. A pair of lower feed belts arranged to press the fabric from the lower surface, drive means for driving the upper feed belt and the lower feed belt in the fabric feed direction, and the needle above or below the fabric. In addition, the entire material or a part of the material folding portion, which is sewn in conjunction with feeding the material held by the upper feed belt and the lower feed belt by a predetermined stitch pitch by the driving means, is orthogonal to the material feed direction. A cross-feeding device for a sewing machine, comprising: a fabric lateral feed means for shifting the needle from the top to the bottom and from the bottom to the top by shifting a predetermined amount in the direction in which the fabric penetrates.