JP3141460B2 - Bead stitch sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a seam forming mechanism for sewing a beaded cloth and a flap cloth on a cloth and is formed between two seams of a sewn work cloth. The present invention relates to a ball stitch sewing machine provided with a female mechanism that forms a corner cut portion extending in a substantially V shape at both ends of a straight hole portion.

[0002]

2. Description of the Related Art Conventionally, there has been provided a sewing machine which automatically performs bead stitching for forming a decorative pocket with a flap (rain lid) on a fabric. As shown in FIG. 11, first, as shown in FIG. 11, firstly, a cloth 2 having both side edges folded in a ring shape is applied to the cloth 1, and a flap cloth 3 is overlapped on one side of the cloth 2. In this state, they are sewn by two seams 4 extending in parallel. Then, as shown in FIG. 12 (a), a straight hole 6 located between the two seams 4 and four corner cuts 7 continuous with the work cloth 5 as shown in FIG. Is automatically formed.

In this case, although not shown in detail, the straight hole 6 is formed by a center knife provided between two sewing needles when the stitch 4 is formed. After the sewing and the formation of the straight hole portion 6, the work cloth 5 is sent to a predetermined position, and four corner scalpels driven by an air cylinder are projected from below, thereby forming four corner cut portions. 7 are formed.

[0004]

FIGS. 11 and 12 (a) show a case in which a border pocket extending in the lateral direction is formed in the fabric 1. In some cases, a trim pocket extending in an oblique direction is formed.

In this case, as shown in FIG. 12 (b), the flap cloth 3 is formed in advance into a parallelogram having an oblique side corresponding to the inclination of the desired decorative pocket, and two stitches are formed. 4 is formed symmetrically with respect to the inclination of the flap cloth 3 so as to be shifted up and down in the figure, and each corner cut portion 7 is formed in accordance with the length of the two stitches 4 in the vertical direction (diagonal deviation d). Must have different lengths (a, b), and the opening angles (α, β) of the corner cuts 7 with respect to the extending direction of the straight hole 6 must also be different.

Conventionally, in order to form the two stitches 4 in the vertical direction in the drawing, the sewing program is switched or changed in accordance with the flap cloth 3. Further, in order to change the length dimension of the corner cut portion 7, a plurality of corner scalpels having different cut lengths are prepared, and the operator replaces them according to the type of sewing. Further, in order to change the opening angle of the corner cut portion 7, the operator manually adjusts the mounting angle of the corner knife.

As described above, in the prior art, every time the type of sewing, in other words, the shape of the flap cloth 3 is changed, the operator has to perform a troublesome and time-consuming operation such as changing a program or replacing a corner knife. This has the disadvantage that human errors also increase.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bead stitch sewing machine that can execute a bead stitch in accordance with a sewing type without an operator performing troublesome work. To offer.

[0009]

A ball stitch sewing machine according to the present invention comprises a stitch forming mechanism for forming two parallel stitches and sewing a bead cloth and a flap cloth to a fabric, From the end of the straight hole formed between the two stitches of the work cloth, the diagonally expanding and extending substantially V-shaped 2
It is provided with a scalpel mechanism for forming a corner cut portion consisting of a notch of the book at each end of the straight hole portion, wherein the
The stitch forming mechanism is configured to determine a sewing start position of each of the two stitches.
And the sewing end position can be freely changed.
The mechanism is the husband of the two cuts in each corner cut section
Each angle and length can be changed freely.
Rutotomoni, a flap cloth shape detection means for detecting a tilt with respect to the sewing direction length and stitch of the flap cloth, the two stitches on the basis of the detection of the flap cloth shape detecting means
A stitch position setting means for setting a sewing start position and sewing end position of each of the two cuts of each of the respective corner cut portion based on the detection of the flap cloth shape detection means s
And a control unit for controlling the stitch forming mechanism and the knife mechanism based on the settings of the stitch position setting unit and the corner cut unit shape setting unit. It is characterized by its features.

[0010]

According to the above means, the length of the flap cloth in the sewing direction and the inclination with respect to the stitch are detected by the flap cloth shape detecting means. Here, the length of the two stitches to be formed is determined based on the length of the flap cloth in the sewing direction and the inclination with respect to the stitch, and the shift amount of the stitch forming position, that is, the oblique deviation is determined. Therefore, based on the detection of the flap cloth shape detecting means, the sewing start position and the sewing end position of each stitch can be set by the stitch position setting means.

On the other hand, the shape of the corner cut portion, that is, the opening angle and the cut length are determined by the inclination of the flap cloth with respect to the seam. Therefore, the shape of the corner cut portion can be set by the corner cut portion shape setting device based on the detection of the flap cloth shape detection device.

The control means controls the stitch forming mechanism and the knife mechanism based on the settings. Therefore, the sewing operation according to the shape of the flap cloth can be automatically performed without performing troublesome program setting and scalpel adjustment work.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. Since the work cloth 5 and the like shown in FIGS. 11 and 12 described in the conventional example are common to this embodiment,
Detailed description and new illustration are omitted, and the same reference numerals are used.

First, with reference to FIG. 2 and FIG. 3, the overall schematic configuration of the bead sewing machine according to the present embodiment will be briefly described. A sewing machine table 12 is provided on a main body 11 of the ball stitch sewing machine, and a clamp device 13 for holding and moving the cloth 1 and the like (work cloth 5) is provided on the sewing machine table 12. Further, a stitch forming mechanism 14 for forming the stitch 4 on the work cloth 5 is provided in the center of the sewing machine table 12 at a position slightly forward (to the right in the figure). A knife mechanism 15 for forming the corner cut portion 7 on the work cloth 5 is provided on the lower surface side of the back part (the left part in the figure) of the sewing machine table 12. Hereinafter, these clamp device 13 and stitch forming mechanism 1
4, the knife mechanism 15 will be described in detail in order.

First, the clamp device 13 will be described with reference to FIGS. The clamp device 13 is provided at the distal end of the clamp arms 16, 16 with the sewing machine table 1.
2 is provided with a pair of left and right large presser plates 17 for holding the cloth 1 at predetermined intervals on both left and right sides thereof. The clamp arms 16 and 16 are configured to rotate around a shaft 16a at a base end (left end in FIGS. 2 and 3) by operation of an actuator 18 (shown only in FIG. 2). As a result, the large presser plates 17 are moved up and down.

The clamp device 13 is moved in the front-rear direction (left-right direction in FIG. 3) by a cloth drive mechanism 19 driven by a movement motor 19a shown in FIG. As a result, the large presser plates 17, 17 move between the set position shown by the two-dot chain line in FIGS. 2 and 3 and the corner cut portion forming position shown by the solid line in the direction of arrow A and in the direction opposite thereto. It is supposed to be.

The large holding plate 17 is, as shown in FIG.
It has an inclined flap mounting plate 20 on the upper surface and a folding plate 21 on its lower surface. The folding plate 21 is provided so as to protrude and retract substantially horizontally toward the inside, and is protruded and retracted by an actuator 22 (see FIG. 2). Further, as shown in FIG.
Above the large presser plates 17, 17, flap pressers 2
Reference numerals 3 and 23 are provided so as to be able to move up and down by a drive source (not shown).

On the other hand, as partially shown in FIGS. 2 and 3, above the front portion of the sewing machine table 12, a binder 24 is provided so as to be able to move up and down. As shown in FIG. 4, the binder 24 has an inverted T-shaped front surface, and is moved down by a drive source (not shown), so as to be located between the large presser plates 17, 17, And the beading cloth 2 is folded into a predetermined shape in cooperation with the folding plate 21.

The cloth 1, the ball cloth 2 and the flap cloth 3 are held in a predetermined shape as shown in FIG. 4 by the clamp device 13 and the binder 24 configured as described above. At this time, the fabric 1 and the like are set as follows.

That is, first, the large presser plate 17 and the binder 2
In a state where 4 is raised above the set position, the operator places the fabric 1 at a predetermined position on the sewing machine table 12 and operates, for example, a foot-operated clamp switch 25 (shown only in FIG. 10). Then, the left and right portions of the fabric 1 are pressed onto the sewing machine table 12 by the large presser plate 17 at predetermined intervals by the actuator 18.

Next, the operator places the ball cloth 2 so as to straddle between the large presser plates 17 and 17 and operates the clamp switch 25. Then, first, the binder 24 descends to bring the center portion of the ball cloth 2 into a pressed state on the cloth 1, and subsequently, the folding plates 21 and 21 protrude inward. As a result, both side portions of the beading cloth 2 are each formed into a shape that is folded inward and upward in an annular shape.

Thereafter, the operator operates one of the large presser plates 1.
7, the flap cloth 3 is set on the flap mounting plate 20 so that one long side of the flap cloth 3 is directed in the front-rear direction, and the flap cloth 3 is addressed to the bead cloth 2, and the clamp switch 25 is operated.
Then, the flap presser 23 descends, and the flap cloth 3 is pressed on the flap placing plate 20.

By the above operation, the cloth 1, the bead cloth 2 and the flap cloth 3 are held by the clamp device 13 at the set position in the state shown in FIGS. Thereafter, when the operator operates the start switch 26 (shown only in FIG. 10), the sewing operation by the stitch forming mechanism 14 is performed while the clamp device 13 is moved in the direction of the arrow A by the cloth driving mechanism 19. And then stopped at the corner cut forming position, where the scalpel mechanism 1
5, the operation of forming the corner cut portion 7 is performed.

The flap cloth 3 is formed in advance in a substantially rectangular shape as shown in FIG. 11 and FIG. However, when forming a decorative pocket extending in the oblique direction in the fabric 1, as shown in FIG. 5 and FIG. 12 (b), it is formed in a parallelogram shape corresponding to the inclination. .

As shown in FIG. 5, a flap shape detecting sensor 27 for detecting the outer shape of the set flap cloth 3 is provided on the upper surface of the flap mounting plate 20 of the large presser plate 17. Is provided. Although not shown in detail, the flap shape detection sensor 27 is configured by two-dimensionally arranging detectors 27a in which LEDs and phototransistors are paired. The external shape of the set flap cloth 3 is detected. Then, the detection signal is input to a control device 28 (see FIG. 10) described later, whereby the length L of the flap cloth 3 in the sewing direction and the inclination θ of the flap cloth 3 with respect to the seam 4 (see FIG. 12B) are detected. It is becoming so.

Next, the seam forming mechanism 14 will be described. As shown in FIGS. 2 and 3, the sewing machine main body 11 includes
A sewing machine arm 29 is provided extending from the right side of the sewing machine table 12 so as to protrude above the sewing machine table 12. At the tip of the sewing machine arm 29,
Two needle bars 30 each having a sewing needle 30a are provided side by side at a predetermined interval on the left and right.

On the other hand, on the lower surface side of the sewing machine table 12,
A thread catcher (not shown) is provided for each of the needle bars 30. Each of the needle bar 30 and the thread wheel catcher is driven by a drive mechanism that uses a sewing machine motor 31 (see FIG. 10) as a drive source.
3, two parallel stitches 4 are formed on the work cloth 5 which is moved in the direction of the arrow A, and the bead cloth 2 and the flap cloth 3 are sewn to the cloth 1. in this case,
The formation length of the seam 4 is determined by the length L of the flap cloth 3.

At this time, each of the needle bars 30 is designed to operate independently, and in the case of forming a laterally extending fringe pocket on the fabric 1 as described above, FIG.
As shown in (a), the left and right needle bars 30 operate simultaneously (the sewing start position and the sewing end position are the same in the left and right directions) so that both ends of the left and right stitches 4 are aligned. On the other hand, when forming a decorative pocket extending diagonally in the fabric 1,
As shown in FIG. 12B, the operation timing of the left and right needle bars 30 is shifted according to the inclination, in other words, according to the inclination θ of the hypotenuse of the flap cloth 3, and the formation position of the left and right stitches 4. Is shifted. The length of this shift is referred to as an oblique deviation d.

The sewing machine table 12 has a needle bar 30
The center knife mechanism 32 (shown only in FIG. 10) for forming the straight hole 6 in the work cloth 5 is disposed near the center of the work cloth 5. Although not shown, the center knife mechanism 32
Is arranged between the needle bars 30 and 30 so that the center knife is protruded and retracted on the sewing machine table 12, whereby the two work cloths 5 are moved with the movement of the work cloth 5 in the direction of arrow A. A straight hole 6 having a predetermined length is formed between the seams 4 and 4. The straight hole 6 is formed so that both end portions thereof are located at positions where a predetermined length is drawn from each end of the seam 4.

Next, the knife mechanism 15 will be described in detail with reference to FIGS. 3, 6 to 9. This female mechanism 1
5 corresponds to the corner cut forming position of the clamp device 13 and corresponds to the front and rear sides of the lower surface of the sewing machine table 12 (FIG. 3).
(Left and right) are provided with two sets of corner knife devices 33.

Each of the corner knife devices 33 is arranged at a predetermined interval corresponding to the straight hole portion 6, and each of the corner knife devices 33 is substantially spaced from the end of the straight hole portion 6 with respect to the work cloth 5. It has two sets of corner cut part forming mechanisms 34 for forming two V-shaped corner cut parts 7.

Here, in the case of forming a decorative pocket extending in the lateral direction in the fabric 1, the left and right corner cut portions 7 are the same as the straight hole portions 6 as shown in FIG. Although it is formed at an angle and with the same cut length, when forming a decorative pocket extending in an oblique direction, as shown in FIG. Length dimensions a and b and angles α and β
And the optimum cut length dimensions a, b and angles α, β change depending on the magnitude of the oblique deviation d.

As will be apparent from the following description, the corner knife device 33 according to the present embodiment includes the cut lengths a and b of the corner cut portion 7 and the angles α and
β (see FIG. 12B) can be arbitrarily changed. Although FIGS. 6 to 9 show one (right side in FIG. 3) of the corner knife device 33 as a representative, the other corner knife device 33 has the same configuration.

The corner knife device 33 includes a base 35
And two sets of corner cut portion forming mechanisms 34 are incorporated in the two. The base 35 is configured to extend in the horizontal direction from both upper and lower ends of a rectangular back plate 36 and integrally include a semicircular plate-shaped upper plate portion 37 and a lower plate portion 38, respectively. As shown in FIG. 8 and FIG.
The lower plate 38 has two long holes 37a, 37a and 38a, 38a symmetrically with respect to the center line k. Then, the lower surface portion of the upper plate portion 37 and the lower plate portion 38
Guide grooves 37b and 38b, which are located on the outer peripheral portion and extend in an arc shape with the center point o as a center, are formed over substantially the entire upper surface portion.

Then, two sets of corner cut portion forming mechanisms 34 are provided symmetrically with respect to the center line k on the base 35. The corner cut portion forming mechanism 34 includes a knife 39, a knife 39 Shaft 4 to which is attached
0, a support member 41 for supporting the shaft 40, two stepping motors 42, 43, and the like.

The support member 41 is composed of two substantially fan-shaped support plates 44 and 45 and a connecting portion 46 connecting the support plates 44 and 45 at an inner peripheral portion. The support plate 44 is located on the lower surface of the upper plate portion 37 of the base 35, and a protrusion (not shown) is slidably engaged with the guide groove 37b. A projection (not shown) located on the upper surface of the guide groove 3
8b is slidably engaged. With this, the support member 4
1 is between the upper plate portion 37 and the lower plate portion 38 of the base 35,
It is provided movably in the directions of arrows B and C along the guide grooves 37b and 38b around the center point o. As shown in FIGS. 8 and 9, the support plates 44 and 45 are formed with rectangular insertion holes 44a and 45a. The insertion holes 44a and 45a are adapted to wrap around the long holes 37a and 38a.

A gear portion 45b is formed on the outer peripheral edge of the lower support plate 45. On the other hand, a knife angle adjusting motor 42 is mounted on the lower surface side of the lower plate portion 38, and a gear 42a mounted on a rotating shaft thereof meshes with the gear portion 45b. The knife angle adjusting motor 42 is controlled by a control device 28 described later.
2 is driven, the support member 41 is moved to the base 35.
Is displaced in the directions of arrows B and C.

On the other hand, the shaft 40 has a vertically long rectangular rod shape, and a rack 40a is formed on one side as shown in FIG. The shaft 40 is provided with the insertion hole 4
By being inserted through 4a and 45a, it is supported by the support member 41 so as to be vertically movable. The upper and lower ends of the shaft 40 also penetrate through the elongated holes 37a and 38a and protrude above and below the base 35. In this case, as the support member 41 is moved in the directions of the arrows B and C, the shaft 40 is also elongated.
The support member 41 is integrally moved within a range of 38a.

The support member 41 includes a support plate 4
Motor mounting member 47 so as to be stretched between
The motor driving member 43 is mounted on the motor mounting member 47. This knife driving motor 43
A pinion gear 43a is attached to the rotating shaft of the shaft 40, and the pinion gear 43a meshes with the rack 40a of the shaft 40. The knife driving motor 43 is also controlled by the control device 28 described later, and the shaft 40 is connected to the support member 41 (base 35) by rotating the knife driving motor 43. On the other hand, it rises and falls.

A female attachment member 48 is provided at the upper end of the shaft 40.
The knife 39 is attached to the knife attachment member 48 by, for example, screwing. As shown in FIG.
The scalpel 39 has a single-edged shape with a sharp edge. The left ridge in the figure extends in the vertical direction, and the right blade 39a has an inclined shape that expands downward. This scalpel 39 is shown in FIG.
As shown in FIG. 7, the blade tip (peak) corresponds to the center point o, and the blade portion 39a is mounted so as to extend in the radial direction from the center point o.

The corner knife device 3 constructed as described above
3, one is a sewing machine table 12 as shown in FIG.
Is attached to a support frame 49 fixed to the lower surface of
It is attached to the lower surface of the sewing machine table 11 on a support frame 50 that is moved in the left-right direction according to the clamp device 13.
At this time, when the clamp device 13 is at the corner cut portion forming position, each of the corner knife devices 33 has a center point o corresponding to an end of the straight hole 6 and a center line k in the left-right direction in the drawing, that is, It is attached so as to be directed in the direction in which the straight hole 6 formed in the work cloth 5 extends.

Thus, when the support member 41 is rotated and displaced, the knife 39 is also rotated around the center point o, and the knife 39 is rotated by the rotating position of the knife angle adjusting motor 42. In other words, the opening angle of the blade portion 39a with respect to the center line k is determined.

The knife 39 is connected to the knife driving motor 4.
3, the workpiece is projected upward from an opening 12a (see FIG. 2) formed in the sewing machine table 12 by the ascending, and is thereby held by the clamp device 13 at the corner cut forming position. For cloth 5,
The work cloth 5 is cut by the blade portion 39a to form the corner cut portion 7. At this time, the rising amount of the knife 39 is changed according to the number of energizing pulses to the knife driving motor 43.

In this case, the formed corner cut portion 7
The opening angles α and β and the lengths a and b are determined by the horizontal direction of the blade 39a of the knife 39 and the blade 39a.
Is determined by the amount of protrusion (the amount of rise of the knife 39). Therefore, the corner cut portion 7 having a required shape is formed by the rotational position of each knife angle adjusting motor 42 and the number of energizing pulses to the knife driving motor 43.

Finally, a control device 28 as a control means for controlling each mechanism of the bead stitching machine having the above-described configuration will be described. As shown in FIG. 10, the control device 28 mainly includes a microcomputer including a CPU 51, a ROM 52, a RAM 53, and the like, and receives signals from the clamp switch 25, the start switch 26, the flap shape detection sensor 27, and the like. It is supposed to be.

Then, as will be apparent from a flowchart described later, the control device 28 receives the input and
Based on the program stored in the OM 52 and the data stored in the RAM 53, the motors 19a of the cloth drive mechanism 19 for moving the clamp device 13, such as the actuators 18, 22 of the clamp device 13, the sewing machine motor 31,
The center knife mechanism 32 is controlled, and further, the knife angle adjusting motor 42 is pulse-controlled, and the knife driving motor 43 is pulse-controlled.

At this time, the control device 28 determines the set flap cloth 3
Of the sewing direction L and the inclination θ of the hypotenuse are calculated by calculation, and based on this detection, the sewing length and the oblique deviation d of the left and right stitches 4 with respect to the work cloth 5, in other words, the sewing by each needle bar 30. The start position and the sewing end position are automatically set.

At the same time, based on the length L of the flap cloth 3 in the sewing direction and the inclination θ of the hypotenuse, the opening angles α and β of each corner cut portion 7, that is, the angle of each knife 39 with respect to the center line k, Knife angle adjustment motor 4
2 is set, and each corner cut portion 7 is set.
The cutting lengths a and b, and the amount of rise of each knife 39 are set.

In this embodiment, the optimum oblique deviation d according to the length L of the flap cloth 3 in the sewing direction and the inclination θ of the hypotenuse is determined in advance.
In addition, the opening angles α and β of the corner cut portion 7 and the cut lengths a and b are created as a data table.
It is stored in the OM 52. Therefore, the control device 28
The oblique deviation d, the opening angles α and β, and the cut lengths a and b are read from the data table, and based on the read data, the needle bar 30 and the center knife mechanism 32 are controlled.
The angle and the amount of rise of each knife 39 are determined, and the knife angle adjustment motor 42 and the knife drive motor 43 are controlled.

Accordingly, the control device 28 functions as the stitch position setting means, the corner cut shape setting means and the control means according to the present invention.

Next, the operation of the above configuration will be described. When the power of the bead sewing machine is turned on, the sewing operation is performed according to the flowchart of FIG. Here, first, in a preparation state for starting the sewing operation, the clamp device 13 is at the set position, and the large presser plate 17 and the like are raised.

To start the sewing operation, the operator first sets the cloth 1 and the ball cloth 2 on the clamp device 13 as described above in step S1.
When the flap cloth 3 is set in the next step S2 and the clamp switch 25 is operated, the flap presser 23 is lowered, and the setting is completed as shown in FIG. Then, in the next step S4, the flap shape detection sensor 27 operates to read the outer shape of the flap cloth 3.

In the next step S5, data necessary for the sewing work is set based on the signal from the flap shape detection sensor 27. That is, as described above, from the signal of the flap shape detection sensor 27, first, the length L of the set flap cloth 3 in the sewing direction and the inclination θ of the hypotenuse are detected by calculation, and then, by reading the data table, The sewing length and the oblique deviation d of the left and right stitches 4 with respect to 5, the opening angles α, β and the cutting lengths a, b of each corner cut portion 7 are obtained. The sewing start position and the sewing end position are set by the
The rotation position of No. 2 and the number of energizing pulses of each knife drive motor 43 are set.

When the setting of the data is completed, in the next step S6, a predetermined number of pulses are supplied to each of the knife angle adjusting motors 42 so as to be positioned at the set rotational position. As a result, the four scalpels 39 of each of the corner cut part forming mechanisms 34 are opened at the optimum angles (a, b) with respect to the center line k according to the inclination θ of the flap cloth 3 when viewed from above. State.

Thereafter, when the start switch 26 is turned on (Yes in step S7), first, in steps S8 to S15, the forming operation of the stitch 4 and the forming operation of the straight hole 6 are executed. . This operation is performed by the clamp device 13.
While moving at a predetermined speed in the direction of arrow A,
0 is driven according to the data of the sewing start position and the sewing end position, respectively, and the center knife mechanism 32 is driven according to the sewing length, not shown in the flowchart.

In this flowchart, it is assumed that the inclination angle θ is not 0 and an oblique deviation d occurs (the left stitch 4 is shifted to the front of the right side) as shown in FIG. 12B. That is, first, in step S8, when the large presser plate 17 (work cloth 5) moves to the sewing start position of the left stitch 4, the large presser plate 17 moves at a predetermined speed for sewing in step S9. First, only the left needle bar 30 is driven by the sewing machine motor 31.

Thereafter, the clamp device 13 is moved to the right stitch 4
Is moved to the sewing start position (Y at step S10).
es) In step S11, the right needle bar 30 is simultaneously driven. When the sewing reaches the sewing end position of the left stitch 4 (Yes in step S12), only the left needle bar 30 is stopped in step S13. At this time, the right needle bar 30 is still operating.

Thereafter, when the clamp device 13 reaches the sewing end position of the right stitch 4 (Y in step S14).
es) In step S15, the sewing machine motor 31 is stopped, and the right needle bar 30 is also stopped. Thus, the optimal seam 4 and the straight hole 6 according to the shape of the flap cloth 3 are formed on the work cloth 5.

When this operation is completed, in step S16, the clamp device 13 moves to the corner cut portion forming position while holding the work cloth 5 and stops there. Then, in step S17, the work cloth 5 is stopped. The formation operation of the corner cut portion 7 is performed. This operation is performed by simultaneously driving the four scalpels 39 by the scalpel drive motor 43 as described above.
At this time, the number of energizing pulses to each knife drive motor 43 is set to an optimal value in step S5 described above.

As a result, each knife 39 is raised by a predetermined amount, and a corner cut portion 7 having a cut length corresponding to the protruding height of the blade portion 39a is formed on the work cloth 5. At this time, in step S6, the blade 3 of each knife 39
9a is oriented at an angle α with respect to the center line k,
Being opened, the corner cut portions 7 having the optimum opening angles α and β and the optimum cutting lengths a and b according to the shape of the flap cloth 3 are formed.

After each knife 39 has been lowered to the original position, in step S18, the clamp device 13 is moved in the direction opposite to the arrow A, and returns to the set position.
7 is raised and the holding of the work cloth 5 is released.

As described above, according to the present embodiment, the data necessary for the sewing operation can be automatically set by the control device 28 by providing the flap shape detection sensor 27. Then, by performing the sewing operation in accordance with the setting, it is possible to form the optimum sewing length and the stitch 4 having the oblique deviation according to the shape of the flap cloth 3 on the work cloth 5 and the optimum opening. The corner cut portion 7 having an angle and a length dimension can be formed.

Therefore, the setting of the program and the adjusting work of the knife as in the prior art are not required, and the optimum bead sewing can be automatically executed without the operator having to perform any troublesome work.

In the above-described embodiment, the case where the flap cloth 3 having the oblique side rising to the right is mounted on the right flap mounting plate 20 has been described. The other case is as follows.

That is, first, when the flap cloth 3 having the lower right slope is placed on the right flap placement plate 20, the forming operation of the right stitch row is started first, and then the oblique deviation is started. After the formation operation of the left stitch row is started with a delay of d, and the formation operation of the right stitch row is ended first,
Further, the forming operation of the left stitch row is continued by the diagonal deviation d, and the sewing is completed.

Next, when the flap cloth 3 having the oblique side rising to the left is placed on the left flap placement plate 20, the forming operation of the right stitch row is started first, and then the oblique deviation d The forming operation of the left stitch row is started with a delay of one minute, and the forming operation of the right stitch row is terminated first, and then the forming operation of the left stitch row is continued by the diagonal deviation d. The sewing is completed.

Finally, when the flap cloth 3 having the oblique side falling to the left is placed on the left flap placement plate 20,
After the forming operation of the left stitch row is started first, the forming operation of the right stitch row is started with a delay of an oblique deviation d, and the forming operation of the left stitch row is ended first. Then, the forming operation of the right stitch row is continued by the diagonal deviation d, and the sewing is completed.

In addition, in the above embodiment, each setting is performed based on a data table created in advance. However, each setting may be performed by a calculation using a predetermined calculation formula, for example. Further, the present invention is not limited to the above-described embodiment. For example, a CCD sensor for two-dimensional detection may be used as the flap shape detection sensor. Can be changed.

[0069]

As is apparent from the above description, according to the ball stitch sewing machine of the present invention, the flap cloth shape detecting means for detecting the length of the flap cloth in the sewing direction and the inclination with respect to the seam, and the flap cloth detecting means 2 based on the detection of the cloth shape detecting means
A stitch position setting means for setting a sewing start position and sewing end position of each of the stitches, based on the detection of flap cloth shape detection unit of the two cuts in each corner cut portion respectively
And the corner cut portion shape setting means for setting the formation angle and length, provided a control means for controlling the stitch forming mechanism and knife mechanism based on the setting of the stitch position setting means and the corner cut portion shape setting means Therefore, there is an excellent effect that the bead stitching according to the type of sewing can be performed without the operator performing a troublesome operation.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a flowchart showing a procedure of a sewing operation.

FIG. 2 is a perspective view of a ball stitch sewing machine on a sewing machine table;

FIG. 3 is a schematic side view of the ball stitch sewing machine.

FIG. 4 is a longitudinal sectional front view in a state where a work cloth is set.

FIG. 5 is a top view of a large presser plate portion.

FIG. 6 is a side view of the corner knife device.

FIG. 7 is a front view of a corner knife device.

FIG. 8 is a top view of the corner knife device.

9 is a cross-sectional top view of the corner knife device along the line IX-IX in FIG.

FIG. 10 is a block diagram showing an electrical configuration.

FIG. 11 is a perspective view of a work cloth showing a state where seams are formed;

12A and 12B are plan views of a work cloth on which different sewing operations have been performed;

[Explanation of symbols]

In the drawings, 1 is a cloth, 2 is a ball cloth, 3 is a flap cloth, 4 is a seam, 5 is a work cloth, 6 is a straight hole, 7 is a corner cut section, 11 is a main body, 12 is a sewing machine table, 13 Is a clamp device, 14 is a stitch forming mechanism, 15 is a female mechanism, 17 is a large presser plate, 19 is a cloth drive mechanism, 20 is a flap placement plate, 21 is a folding plate, 23 is a flap presser, 24 is a binder, 27 is a flap shape detection sensor, 28 is a control device, 30 is a needle bar, 31 is a sewing machine motor, 32 is a center knife mechanism, 33 is a corner knife device, 34 is a corner cut section forming mechanism, 35 is a base, 39 is a knife, 40 is a shaft, 41 is a supporting member, 42 is a knife angle adjusting motor, 4
Reference numeral 3 denotes a knife driving motor.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazushi Inoue 15-1, Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Brother Industries, Ltd. (72) Inventor Koichi Akabane 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Kogyo Co., Ltd. (72) Inventor Hirozumi Ito 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Brother Kogyo Co., Ltd. (56) References JP-A-3-12193 (JP, A) Japanese Patent Publication No. Sho 61-2391 (JP, B2) JP-B 63-14636 (JP, B2) JP-B 1-57183 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 1/00-83 / 00

Claims (1)

(57) [Claims] 1. A stitch forming mechanism for forming two parallel stitches to sew a beading cloth and a flap cloth on a cloth, and a position between the two stitches of the sewn work cloth. A ball provided with a female mechanism for forming a corner cut portion formed of two cuts extending obliquely from the end of the straight hole formed in the above manner and extending in a substantially V-shape at both ends of the straight hole. In the edge stitch sewing machine, the stitch forming mechanism may start sewing each of the two stitches.
The position and sewing end position can be changed freely.
The knife mechanism has two notches in each corner cut section
Angle (α, β) and length (a, b)
Together they are configured to be changed, and the flap cloth shape detection means for detecting an inclination (theta) with respect to said flap sewing direction length of the fabric (L) and stitch, based on the detection of the flap cloth shape detecting means The two
A stitch position setting means for setting a sewing start position and sewing end position of each of the stitches of the two cuts of each of the respective co <br/> Nakatto unit based on the detection of the flap cloth shape detection means s Angle of formation (α,
β) and a corner cut portion shape setting means for setting the length (a, b) ; and controlling the stitch forming mechanism and the knife mechanism based on the settings of the stitch position setting means and the corner cut portion shape setting means. A ball stitch sewing machine comprising control means.