JPS6254029B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hole sewing machine for forming buttonholes and the like using lockstitch and chain stitch stitches.

Conventionally, as this type of hole sewing machine, one having the configuration shown in FIGS. 1 and 2 is known. As shown in FIG. 1, this hole sewing machine includes a sewing machine head 10, a table stand 12, a motor 14 that drives the sewing machine head 10, and a transformer installed in the rotation transmission system between the motor 14 and the sewing machine head 10. It is roughly composed of Mitzta 16. The configuration of the sewing machine head 10 is shown in detail in FIGS. 2A and 2B.
As shown in FIG. 2, all the mechanisms for forming the seam are mounted on a support consisting of a base 18, a bed 20, and an arm 22. The mechanisms are needle bar related, feed mechanism related, looper/spreader related, cloth scissors related, cloth cutting hammer, sector,
They are broadly divided into looper-related and clutch-related. The feeding mechanism described above consists of a main cam 24 which has operation generating functions such as buttonhole shape, cloth cutting hammer, looper stand, needle bar rotation drive, etc., a drive shaft 26 that drives this main cam 24, and a button. Cam 28 that determines the hole length and buttonhole length adjustment plate 30
This device includes a bar tacking length adjustment lever 32, a stitch feed length adjustment arm 34, and an eyelet/sleeping hole switching lever 36.

Next, the operation of the above-mentioned hole sewing machine will be explained. In FIG. 1, when the power switch on the table stand 12 is turned on, the motor 14 starts and the sewing machine head 1
0, but the sewing machine is running idly by the clutch mechanism included in the sewing machine head 10.
No sewing operation is performed. Next, in FIG. 2, the workpiece is placed under the presser foot, and by pressing the start lever 38, the cloth clamp is automatically lowered, and at the same time, the clutch is engaged and the sewing operation is started.

First, according to the length dimension determined in advance by the buttonhole length adjustment plate 30 and the cam 28, a jump feed is applied by the unnecessary sewing length, and when the actual sewing part is reached, the clutch changes from the jump feed to the normal feed. As a result, the main shaft 40 included in the arm 22 rotates, and the needle bar, looper, and spreader are operated via coupling mechanisms such as levers and rods, and sewing operations are performed. During this time,
The feeding device is fed according to the eyelet shape determined by the main cam 24 to form the eyelet. Furthermore, in order to prevent irregularities in the stitches and inversion of the upper thread during eyelet sewing, the needle bar/looper stand rotates 180 degrees in synchronization with the stitches by the action of the main cam 24.
When these series of stitches are completed, blank feed is started again, the cloth cutting hammer 42 is activated, the presser foot is raised, and after one cycle of operation is completed, the sewing machine automatically stops. The cloth cutting hammer 42 can also be operated to cut the cloth before the sewing operation, depending on the object to be sewn.

Here, the eyelet hole, which is a typical buttonhole shape, will be explained. The eyelet holes have a pattern as shown in Fig. 3, with a buttonhole long line part 44 and a round hole part 46.
The round hole portion 46 has several types of patterns. In sewing, first, the cloth is cut with a cloth cutting hammer 42 according to the pattern to be sewn, and the needle bar is swung along this hole based on the zigzag generation source included in the needle bar mechanism, thereby forming the seam 48 shown in FIG. The hole drilling is completed.

Since the conventional hole sewing machine is constructed as described above, the long line portion 44 of the eyelet hole shape shown in FIG.
The shape of the round hole part 46 of the eyelet hole except for the eyelet hole is uniformly determined by one sewing machine head 10, and even though sewing of various shapes is required due to the diversification of fabrics, It was not easy to meet those demands. In other words, in order to change the shape of the hole, a major tooling change is required, including replacing the main cam 24, and the length of the long line part 44 of the eyelet hole and the roughness of the seam of the hole are adjusted using tools. It requires very tedious work using
Moreover, it is not possible to independently adjust the seam roughness of the long line portion 44 and the round hole portion 46, and furthermore, there is the inconvenience that trial stitching must be performed until the desired length and roughness are obtained.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to enable the sewing shape, seam roughness, etc. to be arbitrarily selected from pre-programmed data, and to create beautiful seams. An object of the present invention is to provide a hole sewing machine that can be formed.

In order to achieve the above object, the present invention provides a hole sewing machine for forming buttonholes etc. with lockstitch and chain stitch stitches, in which a work slide plate equipped with a presser foot device is moved by motors of two axes, X and Y. The needle bar and looper stand are connected to an X-Y table that is driven by The control device has a drive data storage circuit that sequentially stores drive data of the X, Y, and Z axis motors as one set for each stitch, and the drive data storage circuit stores the drive data of the , Y- and Z-axis motor drive data are sequentially read out in synchronization with the vertical movement of the needle bar, and based on the read drive data, the drive of the X-Y table and the rotation of the needle bar and looper stand are controlled. It is characterized by

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows the overall configuration of a hole sewing machine according to the present invention, and in the figure, the same members as those in the conventional example described above are designated by the same reference numerals, and the explanation thereof will be omitted.

In the figure, a sewing machine head 10 is equipped with an XY table drive mechanism and a needle bar and looper table rotation mechanism as shown in FIG. That is, in FIG. 5, a workpiece sliding plate 50 equipped with a presser device is connected to an XY table 52. As shown in FIG. This X-Y table 52 can move in the X-Y directions independently, and is connected to an X-direction fixed race 54 and an X-axis stepping motor 56.
It is moved in the X-axis direction by X and timing belt 58X, and fixed race 54Y in Y direction.
is moved in the Y-axis direction by a Y-axis stepping motor 56Y and a timing belt 58Y. These devices are integrated into a unit and placed under the bed 20 shown in FIG. 2 mentioned above. Further, the needle bar 60 and the looper stand 62 are configured to be rotated by a rotational drive mechanism including a Z-axis stepping motor 64, a timing belt 66, and the like.

Y-axis of the X-Y table 52, Y-axis stepping motors 56X, 56Y, and Z-axis stepping motor 6 for rotationally driving the needle bar 60 and looper stand 62.
4 is configured to be controlled by a stored program type control device 68 shown in FIG.

A characteristic feature of the present invention is that the control device 68 controls the XY and Z-axis motors 56 stored in advance.
The drive data of It is to control.

That is, FIG. 6 shows a block configuration of a hole sewing machine including a control device 68, and in the figure, the control device 68 controls X,
It has a drive data storage circuit 70 that stores drive data for the Y- and Z-axis motors 56X, 56Y, and 64. The pattern data includes, for example, hole shape, hole pattern reduction/enlargement dial, buttonhole length, stitch length, sewing speed, etc., and these pattern data are transferred to the hole shape selection switch provided on the control panel 72, Hole pattern reduction/enlargement dial, buttonhole length dial, stitch length dial,
Drive data for each of the motors 56X, 56Y, and 64 is selected and set using a switch such as a sewing speed dial or a setting device.

The drive data storage circuit 70 has a seventh
X, Y and Z axis motors 56 as shown
Drive data with X, 56Y, 64 as one set is stored sequentially for each stitch, and these stored drive data are sequentially read out for each stitch by the main control circuit 76 and stored in the XY table 52. is driven, and the needle bar 60 and looper stand 62 are rotated.

The above-mentioned driving of the X, Y table 52 and rotation of the needle bar 60 and looper stand 62 cannot be performed while the sewing machine needle 78 is stuck into the sewing cloth. You need to do this when you are located. Therefore, in the present invention, the drive of the XY table 52 and the rotation of the needle bar 60 and looper stand 62 are configured to be performed in synchronization with the vertical position of the needle bar 60.

That is, the upper shaft 80 is provided with a needle position detector 84, and as shown in FIG. Needle position detection signal 2
00 is output to the main control circuit 76. This needle position detection signal can be adjusted to any position synchronized with the sewing machine needle. The main control circuit 76 converts the needle position detection signal 200 into a drive data reading signal 2.
02 to read the instantaneous drive data in which the sewing machine needle 78 changes from the lower position to the upper position on the bed 20 surface. The main control circuit 76
In accordance with a synchronizing pulse 204 synchronized with the rotation of 0, each axis control signal 206a, 206b, 206c based on the read drive data is output to the drive circuit 86 for each stitch. The main control circuit 76 also outputs a control signal 208 for the motor 14 and a control signal 210 for controlling various parts of the sewing machine to the drive circuit 86.

The drive circuit 86 generates each axis control signal 206a, 2
Each motor 56X, 56 by 06b, 206c
Axis drive signals 212a and 21 are provided to Y and 64, respectively.
2b, 212c, X-axis drive circuit 88, Y
The drive circuit 86 has an axis drive circuit 90 and a Z-axis drive circuit 92, and the drive circuit 86 sends drive signals 21 to the motor 14 and various parts of the sewing machine using control signals 208 and 210, respectively.
The motor drive circuit 94 has a motor drive circuit 94 that outputs 4,216 signals, and a drive circuit 96 for each part.

Furthermore, an X-axis origin detector 94, a Y-axis origin detector 96, and a Z-axis origin detector 98 are provided on the motor shafts of the motors 56X, 56Y, and 64, respectively, and the The output origin detection signals 218a, 218b, and 218c are input to the main control circuit 76.

Therefore, these origin detection signals 218a, 218
Based on signals b and 218c, a home return signal is output from the main control circuit 76 to the drive circuit 86 when drilling is completed, and the X, Y and Z axis motors 56X, 56Y,
64 drives the X-Y table 52 and needle bar 60.
and the looper stand 62 are returned to their mechanical origins.
Furthermore, by operating a predetermined operation switch during or before sewing, the XY table 52 and looper stand 62 can be returned to their original positions.

Incidentally, as shown in FIG. 4, the device of this embodiment has a start switch 100 and a push-up switch
When the switches 100 and 102 are operated, the operation signals 220 and 222 are sent to the main control circuit 7, respectively.
6 is output.

The embodiment of the present invention has the above configuration, and its operation will be explained below.

The sewing cloth is placed on the workpiece sliding plate 50, and the sewing cloth is pressed and fixed with a cloth presser foot to complete the preparation for sewing holes. Next, desired data is selected from among various pattern data provided in advance on the control panel 72, and the start switch 100 is operated to move the sewing machine needle 78 up and down. And sewing machine needle 7
At the moment when the tip of needle 8 reaches the upper position from the lower position of the bed 20 surface, the needle position detector 84 sends a signal to the main control circuit 76.
The drive data read signal 202 is input to the main control circuit 76 from the drive data storage circuit 70.
Then, desired drive data for the Z-axis motors 56X, 56Y, and 64 as one set is read. Then, based on the read drive data, each axis control signal 206a, 206b, 206c synchronized with the rotation of the upper shaft 80 is output from the main control circuit 76 to the drive circuit 86 for each stitch. As a result, each axis drive signal 212a, 212b, 212c is output from the drive circuit 86 to each motor 56X, 56Y, 64, respectively.
Each motor 56X, 56Y, 64 is driven. Thereafter, as the upper shaft 80 rotates, the sewing machine needle 78
The tip of the sewing machine moves from the upper position to the lower position on the surface of the bed 20 to perform the desired stitching of the sewing cloth.

As described above, in the present invention, the drive data storage circuit 70 stores control programs for various hole shapes such as the eyelet hole shown in FIG.
By sequentially reading out desired drive data in synchronization with the vertical movement of the needle bar 60 and driving each motor 56X, 56Y, 64 based on the read drive data, various shapes of holes can be made. becomes.

Furthermore, in the present invention, the drive data storage circuit 70 includes X, Y and Z axis motors 56X, 56Y,
Since the drive data set of 64 is sequentially stored for each stitch, the drive data can be easily read out.

Furthermore, by arbitrarily selecting the feeding timing of the XY table 52, it is possible to sew in various zigzag patterns shown in FIG. Furthermore, one pattern of the round hole part 46 can be reduced or enlarged independently in X and Y directions, and in a cycle sewing machine starting from point P and ending at point U in FIG. 3, the length of the long line part 44 can be can be freely adjusted relative to each other, and the size of the hole 46 can also be freely adjusted.

As explained in detail above, according to the overlock sewing machine according to the present invention, the needle position can be determined for each stitch, so one model can perform overlock stitches with various hole patterns, and the same overlock sewing machine can be used. Even if it is a hole, the triangular shape of the zigzag seam can be formed into an isosceles triangle or a saw blade shape, and it is possible to form a seam that is more beautiful than conventional seams.

In addition, the conventional complicated cam mechanism and connecting link mechanism are almost eliminated, resulting in an inexpensive, multi-functional and highly flexible device with improved reliability.

[Brief explanation of the drawing]

Figure 1 is an overall external view of a conventional hole sewing machine, Figures 2 A and B are mechanical diagrams of the main parts of a conventional hole sewing machine, Figure 3 is a diagram of the eyelet hole sewing pattern and zigzag needle drop, and Figure 4 5 is an overall configuration diagram of a hole sewing machine according to the present invention, FIG. 5 is an external view showing the XY table drive mechanism, needle bar and looper table rotation mechanism, and FIG.
7 is an explanatory diagram showing the data contents of the drive data storage circuit, and FIG. 8 is an explanatory diagram showing the operation timing of FIG. 6. . The same members in each figure are given the same reference numerals, 50 is a workpiece sliding plate, 52 is an X-Y table, 56X is an X-axis stepping motor, 56Y is a Y-axis stepping motor, 60 is a needle bar, and 62 is a looper. stand, 64
is the Z-axis stepping motor, 68 is the control device, 7
0 is a drive data storage circuit, 76 is a main control circuit, 7
8 is a sewing machine needle, and 84 is a needle position detector.

Claims (1)

[Claims] 1. In a hole sewing machine that forms buttonholes, etc. with lock stitch and chain stitch stitches, a work slide plate equipped with a presser foot is connected to an X-Y table driven by a motor with two X and Y axes. and a control device configured to rotate the needle bar and the looper stand by a Z-axis motor, and controlling the drive of the XY table and the rotation of the needle bar and the looper stand, the control device It has a drive data storage circuit that sequentially stores the drive data of the X, Y and Z axis motors as one set for each stitch, and the drive data of the X, Y and Z axis motors stored in advance in the drive data storage circuit. A hole sewing machine characterized in that drive data of an XY table and rotation of a needle bar and a looper table are controlled based on drive data read out sequentially in synchronization with the vertical movement of a needle bar.