JP2848973B2 - Embroidery sewing machine control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of an embroidery sewing machine for controlling a control object such as an embroidery frame in synchronization with the rotation of a main shaft of the sewing machine.

[0002]

2. Description of the Related Art Taking the control of an embroidery frame, which is one of the control objects, as an example, conventionally, a control according to an address value of a stitch data holding memory is performed based on a pulse signal transmitted by forward rotation of a sewing machine spindle. The amount is calculated, and the embroidery frame is driven accordingly. That is, conventionally, only during the progress of the sewing operation in the embroidery sewing machine, the drive of the embroidery frame is controlled in synchronization with the rotation (forward rotation) of the main shaft of the sewing machine. Then, when a trouble such as a thread break occurs and a stop signal is transmitted from the detector, the sewing machine spindle stops at a predetermined home position. Therefore, a stitch forming mechanism such as a sewing needle mechanically linked with the rotation of the embroidery frame and the sewing machine spindle always stops after one stitch is completed. Then, after the trouble is dealt with, the embroidery frame is frame-back operated by the drive device, so that the embroidery frame returns to the start position of the repair sewing by following the previous stitch in reverse. Thereafter, when the sewing machine main shaft is rotated again by the restart operation, the sewing operation is restarted.

[0003]

During the frame back operation of the embroidery frame, the main shaft of the sewing machine is stopped at the original position, and the embroidery frame remains stopped even if the main shaft of the sewing machine is manually reversed, for example. Here, if the drive power of the sewing machine spindle is turned off due to a power failure or an erroneous operation, and the sewing machine spindle stops at a rotational position different from its original position, that is, during the stitch formation, the following occurs. That is, if the sewing machine main shaft is manually returned to the original position for restarting, the positional relationship between the stitch forming mechanism interlocked with the main shaft and the embroidery frame that has been stopped is shifted. Therefore, unless the positional relationship between the stitch forming mechanism and the embroidery frame is made to correspond to each other, the frame back operation is meaningless, so that preparation for the restart operation is troublesome and the workability is poor. A technical problem of the present invention is that even when the sewing machine spindle stops during the formation of stitches, the sewing machine can be efficiently prepared for restart, and the adjustment at the time of the sewing operation is performed by confirming the mutual movement of the stitch forming mechanism and the embroidery frame. An object of the present invention is to provide a method of controlling an embroidery sewing machine that can be appropriately performed.

[0004]

An embroidery sewing machine control method according to the present invention includes at least one of control objects such as an embroidery frame holding an embroidered cloth, a member for guiding the direction of a decorative material at the time of various kinds of decorative sewing, and the like. In a method for controlling an embroidery sewing machine, which controls the sewing machine in synchronization with the rotation of a sewing machine main shaft that drives a seam forming mechanism, a timing corresponding to one stitch formed by the seam forming mechanism by forward or reverse rotation of the sewing machine main shaft. The normal rotation signal or the reverse rotation signal is transmitted, and the count number for each stitch is added or subtracted based on these signals to obtain a first counter value. Similarly, by forward or reverse rotation of the sewing machine spindle, a forward rotation signal or a reverse rotation signal of a timing corresponding to the predetermined rotation angle of the sewing machine spindle is transmitted, and based on these signals, the count number for each predetermined rotation angle of the sewing machine spindle is calculated. The second counter value is obtained by adding or subtracting. The control amount is calculated by calculating a control amount for each predetermined rotation angle of the main shaft of the sewing machine in each stitch based on stitch data corresponding to the first counter value and control data set in advance corresponding to each value of the second counter value. The driving signal is output to the target driving device.

[0005]

According to the present invention, the object to be controlled such as an embroidery frame is controlled in synchronization with the main spindle of the sewing machine even when the main spindle of the sewing machine is rotated in the reverse direction. Therefore, even when the sewing machine spindle stops at a rotational position different from its original position, if the sewing machine spindle is reversed so as to return to the original position, not only the stitch forming mechanism but also the control object is reverse to the progress of the sewing work. Retreat in the direction. Therefore, if the rotation of the sewing machine spindle stops during stitch formation due to a power failure or the like, simply rotate the sewing machine spindle manually to the original position, and the control target will be in a state corresponding to the original position of this sewing machine spindle. You can go back. Then, from this state, the frame-back operation or the further rotation of the main spindle of the sewing machine completes the preparation for the restart.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, the control method of the present invention is applied to an embroidery sewing machine that can perform decorative stitching such as sewing a tape-shaped or cord-shaped decorative material on an embroidered cloth stretched on an embroidery frame. FIG. 6 shows a configuration diagram of an overall control system of the embroidery sewing machine. In FIG. 6, the sewing machine main shaft 12 of the sewing machine main body 10 is configured to be rotated by driving a motor 14. This sewing machine spindle 12
Rotates a needle bar provided with a sewing needle, a balance, a nipple (cloth foot) and other stitch forming mechanisms.
The stitch forming mechanism is driven so as to form one stitch by one rotation of the sewing machine main shaft 12. Sewing machine spindle 1
2 is provided with a rotary encoder 16.

The sewing machine main body 10 includes a nipple drive shaft 18 (hereinafter, referred to as a "Z axis 18") which rotates around an axis by driving a pulse motor 20. The rotation of the Z-axis 18 is controlled in synchronization with the rotation of the sewing machine main shaft 12, whereby the nipple is rotated so that the decorative material is always guided in the sewing advance direction. The embroidery frame 22 holding the embroidered cloth is moved in the X-axis direction and the Y-axis direction by the driving of the X-axis pulse motor 24 and the Y-axis pulse motor 26 based on the needle drop point of the sewing needle. In other words, by moving the embroidery frame 22 in synchronization with the rotation of the sewing machine spindle 12, the decorative material is sewn to the embroidered cloth in a predetermined embroidery pattern. As described above, in the present embodiment, the Z axis 18 and the embroidery frame 22 are controlled to be rotated and moved in synchronization with the rotation of the sewing machine spindle 12.

In FIG. 6, a microcomputer 50 includes a CPU 30, a RAM 32, and a ROM 34.
The stitch data recorded in the tape reader 28 is read into the RAM 32 through the input / output interface 36, and the RAM 32 has a holding memory for storing the stitch data and other work areas. The ROM 34 stores, as will be described later, a movement waveform of the embroidery frame 22 for each rotation of the sewing machine spindle 12 (each stitch) or a rotation waveform of the Z-axis 18 as control data. A software program for calculating a control amount based on the control data is stored.

FIG. 1 is a block diagram showing a control system of the Z axis 18 and the embroidery frame 22 to be controlled. As is apparent from FIG. 1, the rotary encoder 16 of the sewing machine spindle 12 outputs N pulses (for example, 1000 pulses) of the equally divided signal A,
B is transmitted. These signals A and B have a phase shift of 90 ° from each other, and are converted into a normal rotation signal CWP or a reverse rotation signal CCWP by the normal / reverse determination circuit 60. These signals are sent to a 1 / N frequency dividing circuit 62, where they are converted into a forward rotation signal CWP 'or a reverse rotation signal CCWP' of one pulse per rotation of the sewing machine main shaft 12, and sent to a first up / down counter 64. Can be In the first up / down counter 64, the count value is incremented by "1" if the rotation signal is CWP ', and the count value is decreased by "1" if the rotation signal is CCWP', thereby obtaining the first counter value. . The value of the first counter is determined by the RA
The address value of the stitch data holding memory read and stored in the M32 is provided, and the content thereof, that is, the current stitch data for driving the control target is supplied to the arithmetic circuit 66.

FIGS. 2 and 3 show the contents of the stitch data holding memory in the RAM 32. FIG. As is apparent from these drawings, the stitch data is a set of X-axis, Y-axis data and Z-axis data of the embroidery frame 22 for each stitch. However, for Z axis data, 1
It is calculated from the X-axis and Y-axis data for each stitch and stored. Therefore, if the address reference based on the first counter value is stitch n, the X-axis, Y-axis, and Z-axis data of the stitch n are given to the arithmetic circuit 66.

On the other hand, the forward rotation signal CWP or the reverse rotation signal CCWP output from the forward / reverse determination circuit 60 is sent to the second up / down counter 68 in FIG. Here, every pulse,
That is, every time the sewing machine spindle 12 rotates 1/1000 revolutions, the count is incremented by "1" if the rotation signal is CWP, and the count is decreased by "1" if the rotation signal is CCWP, and the second counter value is incremented. Ask. This second counter value becomes the address value of the control data stored in the ROM 34, and its content, that is, 1/100 of the sewing machine spindle 12.
The movement value of the embroidery frame 22 for every 0 rotation (or the rotation angle of the Z axis 18) is given to the arithmetic circuit 66.

FIG. 4 shows the movement waveform of the embroidery frame 22 stored in the ROM 34. In this movement waveform, the embroidery frame 22 has the maximum amount (for example, 12.7 mm) in one stitch.
The shape when moving is shown. That is, ROM3
Since the value of the maximum movement of the embroidery frame 22 is stored in 4, when the movement amount is smaller than that, the position to which the embroidery frame 22 is to be moved is calculated by the arithmetic circuit 66 by the following equation. SPOT = (D × W) / 127 where SPOT is the position of the embroidery frame 22 to be moved, D is the content of stitch data whose address is referred to based on the first counter value, and W is the address which is referred to by the second counter value. This is the content of the control data for the X and Y axes.

FIG. 5 shows a rotation waveform of the Z-axis 18 similarly stored in the ROM 34. This rotation waveform is a shape when the Z-axis 18 is rotated by the maximum rotation angle (180 °) in one stitch. When the rotation angle is smaller than the maximum rotation angle, the angle to be rotated by the Z-axis 18 is calculated by the arithmetic circuit 66 by the following equation. Calculate. ANGLE = (Q × P) / 180 where ANGLE is the angle to rotate the Z-axis 18, Q is the Z-axis rotation angle whose address is referred to based on the first counter value, and P is the address which is referred to by the second counter value. Z
This is the contents of the control data for the axis.

As described above, every rotation of the sewing machine spindle 12 (1
Based on the first count value transmitted from the first up / down counter 64 (for each stitch), the current stitch data is input to the arithmetic circuit 66, and 1/1 of the sewing machine spindle 12 is used.
Based on the second counter value transmitted from the second up / down counter 68 every 1000 rotations, control data stored in the ROM 34 for every 1/1000 rotation of the sewing machine spindle 12 is input to the arithmetic circuit 66. The arithmetic circuit 66 calculates each data of the X-axis, Y-axis and Z-axis in the current stitch, and the positions of the embroidery frame 22 and the Z-axis 18 in the stitch, and the values are calculated by the driving device 40 in FIG.
Is output to

When the sewing machine spindle 12 is rotating forward, whether the sewing operation is in progress or during adjustment before the sewing operation, the first counter value and the second counter value are both up-counted, and each count value is incremented. Every time "1" is added, the X-axis pulse motor 24, Y
Drive signals are output to the axis pulse motor 26 and the pulse motor 20 of the Z axis 18, respectively. This allows the embroidery frame 22
And the Z-axis 18 are driven in synchronization with the forward rotation of the main shaft 12 of the sewing machine. Also, when the sewing machine spindle 12 is reversed by manual operation or the like, the first counter value and the second counter value are both down-counted. In this case, each time the count value is decremented by "1", the X-axis, Y-axis and Z-axis data values are converted into the opposite values (if the data value is a binary number, it is converted to a two's complement number). After that, the drive unit 40 outputs the drive signals to the X-axis pulse motor 24, Y-axis pulse motor 26, and Z-axis pulse motor 20 of the embroidery frame 22 as respective drive signals. Thereby, the embroidery frame 22 and the Z axis 1
Reference numeral 8 retreats by following the previous stitch in synchronization with the reverse rotation of the sewing machine spindle 12. Moreover, this operation can be performed even at a rotational position other than the original position predetermined as the rotation reference point of the sewing machine spindle 12, that is, during the stitch formation.

Therefore, even if the drive power of the sewing machine spindle 12 is cut off due to a power failure or an erroneous operation, and the sewing machine spindle 12 stops during the formation of stitches, if the sewing machine spindle 12 is manually rotated to the original position, the Z-axis 18 And embroidery frame 22
Is returned to a state corresponding to the original position of the sewing machine spindle 12. By performing this operation, the embroidery frame 22 and the nipple are returned to an arbitrary repair sewing position, and preparation for restart is completed.

[0017]

As described above, according to the present invention, even when the rotational drive of the sewing machine spindle is stopped during the formation of stitches due to a power failure or the like, if the sewing machine spindle is rotated so as to return to the original position, this problem can be solved. Since the control target such as the embroidery frame moves backward in synchronization, the preparation for the restart can be efficiently performed. Further, the adjustment work at the time of the sewing work can be performed appropriately while confirming the mutual movement between the stitch forming mechanism such as the sewing needle and the control target such as the embroidery frame, which is convenient.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control system of a Z axis and an embroidery frame to be controlled.

FIG. 2 is an explanatory diagram showing the contents of a stitch data holding memory read into a RAM.

FIG. 3 is an explanatory diagram showing the contents of data in stitch n of the stitch data.

FIG. 4 is a characteristic diagram showing a movement waveform of an embroidery frame stored in a ROM.

FIG. 5 is a characteristic diagram showing a Z-axis rotation waveform stored in a ROM.

FIG. 6 is a configuration diagram showing an overall control system of the embroidery sewing machine.

[Explanation of symbols]

 12 sewing machine spindle 18 Z-axis 22 embroidery frame 40 drive

Claims (1)

(57) [Claims] At least one of controlled objects, such as an embroidery frame holding an embroidered cloth and a member for guiding the direction of a decorative material at the time of various kinds of decorative sewing, is used for rotating a main shaft of a sewing machine for driving a seam forming mechanism. A method for controlling an embroidery sewing machine that is controlled synchronously, wherein a forward or reverse rotation of the sewing machine main shaft is performed.
A forward rotation signal or a reverse rotation signal at a timing corresponding to one stitch formed by the seam forming mechanism is transmitted, and a count value for each stitch is added or subtracted based on these signals to obtain a first counter value. Similarly, by forward or reverse rotation of the sewing machine spindle, a forward rotation signal or a reverse rotation signal of a timing corresponding to the predetermined rotation angle of the sewing machine spindle is transmitted, and based on these signals, the count number for each predetermined rotation angle of the sewing machine spindle is calculated. A second counter value is obtained by addition or subtraction, and a predetermined value of the sewing machine spindle in each stitch is obtained based on stitch data corresponding to the first counter value and control data set in advance corresponding to each value of the second counter value. An embroidery sewing machine control method for calculating a control amount for each rotation angle and outputting a drive signal to the drive device to be controlled.