JPH0531275A - Binding sewing machine - Google Patents

Abstract

PURPOSE:To binding sewing machine which can form comer cut parts of different lengths in the case of binding without executing a changing work of a knife, and also, always stably and with a satisfactory cutting quality. CONSTITUTION:A shaft 26 in which a knife 25 is fixed to the upper end passes trough the upper and the lower supporting plates 30, 31 of a supporting member 27 and is supported so as to be movable vertically, and this shaft 26 is moved vertically by a knife driving step-motor 29 fixed integrally to the supporting member 27. In the knife 25 an inclined blade part 25a is formed and by an ascent amount of the shaft 26, notch length of each corner part is varied. In accordance with a V-shape corner cut part, a pair of supporting members 27 are provided, and simultaneously, each knife 25 is allowed to ascend by a set distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bead sewing machine capable of automatically forming straight hole portions and corner cut portions on a work cloth.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
In the state in which the beaded cloth 2 in which both side edge portions are folded back in a ring shape is applied, they are sewn together by two seams 3 extending in parallel, and the straight cloth hole portion 5 is attached to the work cloth 4. There is provided a bead sewing machine in which a notch made up of four corner cut portions 6 continuous with the above is automatically formed.

In this case, although not shown in detail, the straight hole portion 5 is formed by a center knife provided between two sewing needles when the stitch 3 is formed. After the sewing and the formation of the straight hole 5, the work cloth 4 is sent to a predetermined position, and four corner knives driven by an air cylinder are simultaneously projected from below, thereby cutting four corners. The part 6 is formed.

By the way, in the case where, for example, an edging pocket extending in an oblique direction is formed on the cloth 1, as shown in FIG. 11, two seams 3 are formed by vertically shifting in the figure and The length dimensions of the corner cut portions 6 must be different. Therefore, conventionally, a plurality of corner knives having different cut lengths are prepared and replaced according to the type of sewing.

However, in this case, there is a problem that the cost becomes high because a plurality of corner knives must be prepared in advance, and there is a problem that the operator has to perform a troublesome replacement work.

[0006]

Therefore, in recent years, as disclosed in Japanese Patent Laid-Open No. 3-12193, it has been considered that one corner knife is used to correspond to a corner cut portion having a different length. As shown in FIG. 12, this is constructed by inclining a corner knife M (FIG. 12 (a)) that normally forms a corner cut portion 6 having a length dimension m, by tilting it by the driving force of a motor. In particular, the corner cut portion 6 having a long length dimension n is to be formed ((b) of the same figure).

However, this Japanese Patent Laid-Open No. 3-12193
In the technique disclosed in the publication, as shown in FIG.
When there are two left and right corner cut portions 6 forming a “V” shape, and one is long and the other is short, the cutting start timing and blade pressure will be different between the left and right, so cutting will be successful. There was a problem that it could not be done and the sharpness was poor.

The present invention has been made in view of the above circumstances. An object of the present invention is to form corner cut portions having different lengths with stable and good sharpness without replacement work of a knife. It is to provide a bead sewing machine capable of sewing.

[0009]

In a bead sewing machine of the present invention, a beaded cloth is sewn to a cloth by two seams extending in parallel, and a space between the two seams is formed on the work cloth. And forming straight hole portions parallel to the stitches, and two corner cut portions extending substantially in a V shape from the ends of the straight hole portions and extending in an oblique direction. Blades that are respectively formed at both ends of the blade and that are vertically movable corresponding to the corner cut portions on the lower surface side of the support table that supports the work cloth, and that are inclined with respect to the rising direction. The knife is characterized in that it has a knife and a knife driving means for lifting the knife to the upper surface of the support table when the knife is raised and knife driving means for raising each knife by an arbitrary amount.

[0010]

According to the above means, when the knife is lifted by the knife driving means, the work cloth supported by the support is cut by the blade of the knife to form a corner cut portion. At this time, the amount of protrusion of the blade from the support base changes depending on the amount of rise of the knife, but since the blade is inclined with respect to the ascending direction of the knife, the amount of protrusion of the blade causes the work cloth to move. The length dimension of the corner cut portion formed at is changed.

Therefore, by raising each knife by the knife driving means at an arbitrary rising amount, it is possible to form a corner cut portion of an arbitrary length on the work cloth without exchanging the knife. It will be possible.

In this case, by simultaneously driving a plurality of knives at a plurality of corner cut portions, the timing of starting cutting and the blade pressure can be made equal, and a stable sharpness is always obtained. It is possible to form a plurality of corner cut portions.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Since the work cloth 4 shown in FIGS. 10 and 11 described in the conventional example is also common to this embodiment, detailed description and new illustration are omitted, and common reference numerals are used.

First, with reference to FIG. 5, a schematic structure of a bead sewing machine according to this embodiment will be briefly described. A work table 11 as a support is provided on the main body of the sewing machine, and a sewing machine arm 13 having two needle bars 12 (only one is shown) is provided on the work table 11 at a lower portion of the tip with a predetermined distance. Has been.

The two needle bars 12 are used for the sewing machine motor 1.
4 (only shown in FIG. 6) is driven up and down by a drive mechanism, and cooperates with a thread catcher (not shown) provided on the lower surface side of the work table 11 to sew the work cloth 4. It is adapted to form the eye 3. Although not shown,
A center knife mechanism for forming a linear hole 5 in the work cloth 4 is disposed between the two needle bars 12.

On the work table 11, there is provided a clamp device 15 for holding the cloth 1 (work cloth 4) on the upper surface of the work table 11. The clamp device 15 is configured to hold the cloth 1 shown in FIGS. 10 and 11 on both left and right sides thereof with a space for forming the stitches 3, and at a set position shown by a chain double-dashed line in FIG. And a corner cut forming position shown by a solid line.

The clamp device 15 is moved in the left-right direction in the drawing by a cloth drive mechanism 17 provided on the lower surface side of the work table 11 and having a drive motor 16 as a drive source. Also, on the work table 11,
A binder 18 is provided at the right side of the sewing machine arm 13. The binder 18 is for holding the beaded cloth 2 arranged on the upper surface of the cloth 1 held by the clamp device 15 in a state where both side edge portions are folded back in a ring shape.

As a result, while the clamp device 15 holding the cloth 1 and the beaded cloth 2 moves from the set position in the direction of arrow A in FIG. 5, each needle bar 12 is driven by the drive mechanism, The fabric 1 is sewn with a beaded cloth 2 by two seams 3 extending in parallel. At the same time, a straight hole 5 is formed by a center knife mechanism on a work cloth 4 formed by sewing the beaded cloth 2 on the cloth 1.

On the lower surface side of the work table 11, two sets of corner knife devices 19 are provided corresponding to the corner cut forming positions of the clamp device 15. As will be described later in detail, each of the corner knife devices 19 has two sets of knife mechanisms 20 (see FIG. 2), and the knife mechanisms 20 allow the straight hole portions to be formed in the work cloth 4. A total of four corner cut portions 6 are formed so as to spread laterally from the end portion 5 in the left-right direction and extend in a substantially V shape.

Here, in the bead sewing machine according to this embodiment, as shown in FIG. 10, two beaded cloths 2 are sewn on a cloth 1 by two seams 3 extending in parallel, Work cloth 4
On the other hand, the sewing work for forming the notches made up of the straight hole portion 5 and the four corner cut portions 6 is automatically performed. However, when the fabric 1 is formed with an edging pocket extending in an oblique direction, for example. As shown in FIG. 11, two stitches 3 are formed by vertically shifting in the figure, and along with this, the length dimension of each corner cut portion 6 and the linear hole portion 5 are formed.
It is necessary to change the angle with respect to.

Therefore, the corner knife device 19 of this embodiment is used.
As described below, the configuration is such that not only the cut length dimension of the corner cut portion 6 but also the angle with respect to the linear hole portion 5 can be arbitrarily changed. Hereinafter, the corner knife device 19 will be described in detail with reference to FIGS. 1 to 4. It should be noted that these FIG. 1 to FIG.
Although the corner knife device 19 on the right side is shown, the other corner knife device 19 has the same configuration.

The corner knife device 19 has a base 21.
It is configured by incorporating two sets of knife mechanisms 20 into the. The base 21 is configured to integrally have a semi-circular plate-shaped upper plate portion 23 and a lower plate portion 24 so as to extend in the horizontal direction from the upper and lower end portions of a rectangular plate-shaped back plate 22. As shown in FIGS. 3 and 4, each of the upper plate portion 23 and the lower plate portion 24 has two elongated holes 23 symmetrically with respect to the center line k.
a, 23a and 24a, 24a are formed. Further, guide grooves 23b and 24b, which are located on the outer peripheral portion and extend in an arc shape around the center point o, are formed over substantially the whole of the lower surface portion of the upper plate portion 23 and the upper surface portion of the lower plate portion 24, respectively. ..

The base 21 is provided with two sets of knife mechanisms 20 symmetrically with respect to the center line k. The knife mechanism 20 includes a knife 25, a shaft 26 to which the knife 25 is attached, A support member 27 that supports the shaft 26 so as to be vertically movable, and two stepping motors 28 and 29.
Etc.

Of these, the support member 27 is composed of two substantially fan-shaped support plates 30 and 31, and a connecting portion 32 that connects the support plates 30 and 31 at the inner peripheral portion.
The support plate 30 is located on the lower surface of the upper plate portion 23 of the base 21, and a protrusion (not shown) is slidably engaged with the guide groove 23b, and the support plate 31 is the lower plate portion. 24
The protrusion not shown in the drawing is located on the upper surface of the guide groove 24b.
Slidably engaged with. With this, the support member 27
Is provided between the upper plate portion 23 and the lower plate portion 24 of the base 21 so as to be movable in the directions of arrows B and C along the guide grooves 23b and 24b around the center point o. Further, as shown in FIGS. 3 and 4, the support plates 30 and 31 are provided with rectangular insertion holes 30a and 31a. The insertion holes 30a and 31a are arranged so as to overlap the elongated holes 23a and 24a.

A gear portion 31b is formed on the outer peripheral edge of the lower support plate 31. On the other hand, a knife angle adjusting motor 28 is attached to the lower surface of the lower plate portion 24, and a gear 28a attached to the rotating shaft of the motor 28 meshes with the gear portion 31b. The knife angle adjusting motor 28 is controlled by a control device which will be described later, and when the knife angle adjusting motor 28 is driven by this, the supporting member 27 is moved toward the base 21 by an arrow. It is adapted to be displaced in the B and C directions.

On the other hand, the shaft 26 is in the form of a rectangular rod that is long in the vertical direction, and a rack 26a is formed on one side surface thereof as shown in FIG. The shaft 26 has the insertion hole 3
The support member 27 is supported by the support member 27 so as to be vertically movable by being inserted through 0a and 31a. Both upper and lower ends of the shaft 26 also penetrate the long holes 23a and 24a and project above and below the base 21. In this case, as the support member 27 is moved in the directions of the arrows B and C, the shaft 26 also has the elongated holes 23a,
It is adapted to be moved integrally with the support member 27 within the range of 24a.

The support member 27 has a support plate 3
The motor mounting member 33 so that it is hung between 0 and 31
Is provided, and the knife driving step motor 29 is mounted on the motor mounting member 33. A pinion gear 29a is attached to the rotary shaft of the knife driving step motor 29, and the pinion gear 29a meshes with the rack 26a of the shaft 26. This knife drive motor 29
Is also controlled by a control device which will be described later, whereby the shaft 26 moves up and down with respect to the support member 27 (base 21) by rotating the knife driving motor 29. It is like this.

A female mounting member 34 is attached to the upper end of the shaft 26.
The knife 25 is attached to the knife attachment member 34 by, for example, screwing. As shown in Figure 1,
The knife 25 has a single-edged shape with a sharp edge, the left ridge portion in the figure extends in the vertical direction, and the right blade portion 25a has an inclined shape that widens downward. This scalpel 25 is shown in FIG.
As shown in FIG. 5, the blade tip (ridge) corresponds to the center point o when viewed from the upper surface, and the blade section 25a is attached so as to extend in the radial direction from the center point o.

The corner knife device 1 thus configured
As shown in FIG. 5, one of the reference numerals 9 is attached to a support frame 35 fixed to the lower surface of the work table 11, and the other is a support frame 3 which is movable to the left and right on the lower surface of the work table 11.
It is attached to 6. In this case, the corner knife device 1
9 is attached so that the center line k is oriented in the left-right direction in the figure, that is, in the direction in which the straight hole portion 5 formed in the work cloth 4 extends. Further, the support frame 36 on the left side in the figure is adapted to be moved in the left-right direction according to the cut length of the linear hole portion 5 by the center knife mechanism, whereby the two sets of corner knife devices 19 are linearly moved. It is positioned in a state where there is a predetermined interval according to the holes 5.

With this, when the support member 27 is rotationally displaced, the knife 25 is also rotated about the center point o accordingly, so that the knife 25 is rotated by the rotational position of the knife angle adjusting motor 28. The opening angle of the blade portion 25a with respect to the center line k is determined. And the female 25
The work cloth 4 is raised and lowered by the knife driving motor 29, and when raised, protrudes upward from the opening formed in the work table 11 and thus is held by the clamp device 15 at the corner cut forming position. On the other hand, the work cloth 4 is cut by the blade portion 25a to form the corner cut portion 6. In this case, the rising amount of the knife 25 is changed by the number of energizing pulses to the knife driving motor 29.

On the other hand, an operation panel 37 as shown in FIG. 7 is provided on the front surface of the main body of the sewing machine. The operation panel 37 has a start key 38 for starting a sewing operation, a program key 39 for setting a mode of the sewing operation desired by the user, a reference setting lever switch 40, a ten key 41, and a plurality of keys. The display unit 42 of FIG. Further, on the operation panel 37, a guide graphic 43 as shown in FIG. 8 is written.

With the operation panel 37, the user sets the reference stitch row and, as shown in the guide pattern 43, the sewing length L, the sewing start side deviation ΔS, and the sewing end side deviation ΔE. In addition, the opening angles a, b, c, d with respect to the extending direction of the straight hole portion 5 and the cut lengths thereof can be input for each of the four corner cut portions 6. Is becoming

Each mechanism of the bead sewing machine constructed as described above is controlled by the control device 44 shown in FIG. This control device 44 includes a CPU 45, R
The microcomputer mainly comprises an OM 46, a RAM 47, etc., and signals from the start key 38, program key 39, reference setting lever switch 40, ten keys 41, etc. of the operation panel 37 are inputted.

The control device 44 receives the input, and stores the program stored in the ROM 46 and the RAM 47.
The sewing machine motor 14 is controlled via the driver 48 based on the data stored in
The drive motor 16 via the driver 50 (only one is shown), and the knife angle adjusting motor 28 is pulse-controlled through the driver 51 (only one shown). The motor 29 is pulse-controlled.

At this time, the control device 44 causes the reference stitch row, the sewing length L, the sewing start side deviation ΔS, and the sewing end side deviation ΔE.
The sewing start position and the sewing end position of the two rows of stitches 3 are calculated based on the input of, and the stitches 3 corresponding to the input are automatically formed on the work cloth 4. .. Then, the rotational position of each knife angle adjusting motor 28 is determined based on the opening angles a, b, c, d of each corner cut portion 6, and the knife driving motor is driven based on the input of each cut length. The number of energizing pulses to the motor 29 is determined by, for example, calculation.

Therefore, the control device 44, the knife driving motor 29 and the like constitute the knife driving means according to the present invention.

In this case, the ascending amount of the knife 25 is determined by the number of energizing pulses to the knife driving motor 29. Here, the blade portion 25a is inclined with respect to the ascending direction of the knife 25. , The work table 11 of the blade portion 25a
The length dimension of the corner cut portion 6 formed on the work cloth 4 changes depending on the amount of protrusion from. Therefore, by determining the number of energizing pulses to each knife driving motor 29, each corner cut portion 6 is formed on the work cloth 4 with a cut length corresponding to the amount of rise of each knife 25. ..

Further, the four corner cut portions 6 are formed at the same time, but at this time, the rising timings of the four knifes 25 are all the same. As a result, in each corner cut portion 6, the timing of starting cutting and the blade pressure are made equal.

Next, the operation of the above configuration will be described with reference to FIG. When the power of the bead sewing machine is turned on,
The sewing work is executed according to the flowchart of FIG.
Here, when starting the sewing work, first, the operator inputs and sets a desired sewing length L and the like using the operation panel 37.

At this time, if it is desired to perform the same sewing work as in the previous mode, it is not necessary to newly set the previous setting. Therefore, the start key 38 is turned on (Yes in step S1). ), The sewing work is started.
On the other hand, when it is desired to input, the program key 39 is first turned on (Yes in step S2).

To input data, first, the lever switch 4
The right reference or the left reference is selected by 0 (step S
3). After this selection, the sewing length L of the stitch row on the reference side is input with the ten keys 41 (step S4 or S6),
Further, the deviation ΔS at the sewing start side and the deviation ΔE at the sewing end side are sequentially input (step S5 or S7). Here, for example, in the case of the right reference (Yes in step S3), the sewing length L of the right stitch row is input in step S4, and in step S5, the deviation ΔS on the sewing start side, that is, the left side How much the sewing start point of the stitch row deviates from the right stitch row, and how much the sewing end side deviation ΔE, that is, how much the sewing end point of the left stitch row deviates from the right stitch row Will be input. In the case of left reference, the opposite is true.
As shown in FIG. 10, when the left and right stitches 3 perform the same sewing work, ΔS and ΔE are 0.

Next, at step S8, the opening angles a, b, and
Input c, d and cut length. This input is performed for each of the four corner cut portions 6 on the left and right sides on the sewing start side and the left and right sides on the sewing end side. This completes the input of the mode of sewing work. As a result of this input, the control device 44 determines the sewing start position and the sewing end position of the two rows of stitches 3 as described above, and the rotational position and knife of the knife angle adjusting motor 28 in each knife mechanism 20. The number of energizing pulses to the drive motor 29 is determined and stored in the RAM 47.

When starting the sewing work,
The operator sets the dough 1 on the clamp device 15 at the setting position, and further, the beaded cloth 2 on the dough 1.
Is placed and the binder 18 is operated. As a result, with the beaded cloth 2 having both side edges folded back in a ring shape, the cloth 1
Together with this, it is held by the clamp device 15. Here, when the start key 38 is turned on (step S1
Yes), the sewing work is started.

When the sewing operation is started, first, at step S9, a predetermined number of pulses are energized so that each knife angle adjusting motor 28 is located at the determined rotational position. As a result, the knife 25 of each knife mechanism 20 has an angle a, which is input and set with respect to the center line k when viewed from above.
It is opened at the angles of b, c, and d.

At the next step S10, the forming operation of the stitch 3 and the forming operation of the linear hole portion 5 are executed. In this operation, the left and right needle bars 12 are driven in accordance with the sewing length L and the sewing start side deviation ΔS and the sewing end side deviation ΔE while moving the clamp device 15 in the direction of arrow A at a predetermined speed. , By driving the center knife mechanism in accordance with them. As a result, the seam 3 and the linear hole 5 are formed on the work cloth 4.

When this operation is completed, in step S11, the clamp device 15 is stopped at the corner cut forming position while holding the work cloth 4, and in step S12, the corner cut for the work cloth 4 is continued. The forming operation of the portion 6 is executed. This operation is performed by simultaneously driving the four knives 25 by the knives driving motor 29 as described above. At this time, the number of energizing pulses to each knives driving motor 29 is It is assumed to correspond to the entered cut length.

As a result, each knife 25 is lifted by a predetermined amount, and each blade 25a is projected on the work table 11 by a predetermined amount, so that the work cloth 4 has the blade 25a.
The corner cut portion 6 is formed by cutting the length dimension corresponding to the protruding height of the. After each knife 25 is lowered to the original position, in step S13, the holding of the work cloth 4 by the clamp device 15 is released, and the clamp device 15 is again returned to the set position and moved.

As described above, according to the present embodiment, the knife 25 having the blade portion 25a inclined with respect to the ascending direction is raised by the knife driving motor 29 at an arbitrary raising amount. By setting the rising amount, it is possible to form a cut in the work cloth 4 with an arbitrary length. Therefore,
It is possible to form a corner cut portion 6 of one kind of knife 25 having an arbitrary length dimension on the work cloth 4 without the need to replace the knife as in the conventional one.

Since four knife 25 having the same shape are driven at the same time, in the four corner cutting parts 6, the timing of starting cutting and the blade pressure can be made equal. As a result, unlike the one in which the cutting length is changed by the inclination of the knife M, the plurality of corner cut portions 6 can always be stably formed with good sharpness.

Moreover, particularly in this embodiment, since the angle of the knife 25 can be changed by the knife angle adjusting motor 28, the angle of the corner cut portion 6 can also be freely changed. Is also something that can be obtained.

In the above embodiment, the corner cut portion 6
Although the angle of can be changed freely,
The present invention does not necessarily have to have such a configuration, and for example, a V-shaped knife may be used to raise a predetermined amount to change the cut length of the corner cut portion having the fixed opening angle. Can be appropriately modified and implemented without departing from the scope of the invention.

[0052]

As is apparent from the above description, according to the bead sewing machine of the present invention, it is provided on the lower surface side of the support base for supporting the work cloth so as to be vertically movable corresponding to each corner cut portion. And a knife driving means for raising the knife by an arbitrary amount of elevation, having a blade that is inclined with respect to the ascending direction and is raised to project the blade onto the upper surface of the support base. With the provision of (1) and (2), there is an excellent effect that corner cut portions having different lengths can be formed stably and always with good sharpness without the need to replace the knife.

[Brief description of drawings]

FIG. 1 is a side view of a corner knife device according to an embodiment of the present invention.

[Figure 2] Front view of the corner knife device

FIG. 3 is a top view of the corner knife device.

4 is a cross-sectional top view of the corner knife device taken along line IV-IV in FIG.

FIG. 5 is a schematic side view of a bead sewing machine.

FIG. 6 is a block diagram showing an electrical configuration.

FIG. 7 is a front view of the operation panel.

FIG. 8 is an enlarged front view of part of the operation panel.

FIG. 9 is a flowchart showing a procedure of sewing work.

FIG. 10 is a plan view of the work cloth showing a state where the sewing work is finished.

FIG. 11 is a plan view of the work cloth showing a state in which sewing different from that in FIG. 10 is applied.

FIG. 12 is a side view of a corner knife showing a conventional example.

[Explanation of symbols]

In the drawings, 1 is cloth, 2 is ball cloth, 3 is seam, 4 is work cloth, 5 is straight hole portion, 6 is corner cut portion, 11 is work table (support base), 12 is needle bar, 15 Is a clamp device, 18 is a binder, 19 is a corner knife device, 20 is a knife mechanism, 21 is a base, 25 is a knife, 26 is a shaft, 27
Is a supporting member, 28 is a knife angle adjusting motor, 29 is a knife driving motor, 37 is an operation panel, and 44 is a controller.

Front page continuation (72) Inventor Kazushi Inoue 15-1 Naeshiro-cho, Mizuho-ku, Nagoya City Brother Industries, Ltd.

Claims (1)

Claim: What is claimed is: 1. A fabric is sewn with a beaded cloth by two seams extending in parallel, and the seam is located between the two seams with respect to the work cloth. A straight hole parallel to the straight hole is formed, and two corner cut portions that extend in an oblique direction from the end of the straight hole and extend in a substantially V shape are formed at both ends of the straight hole. In the bead sewing machine with the above-mentioned structure, the support table that supports the work cloth is provided on the lower surface side so as to be vertically movable in correspondence with each of the corner cut portions, has a blade portion that is inclined with respect to the rising direction, and is raised. And a knife driving means for raising each knife by an arbitrary amount of elevation, whereby a bead sewing machine is provided.