JPH0759975A - Control device for cycle sewing machine - Google Patents

Abstract

PURPOSE:To guarantee the optimum acceleration, deceleration and suspension controls by letting a cycle needle number automatic setting mode be stored in a non-volatile memory, and enable a cycle needle number to be accurately detected even if a controller is set on the machine head section of any cycle needle number. CONSTITUTION:After a power supply has been turned on, it is inputted by a cycle needle number automatic setting means 36 so as to be stored in a non- volatile memory whether or not the automatic setting of a cycle needle number is automatically selected after general initial treatments have been done. Next, when a pedal sensor 38 is turned on with a pedal depressed, a cloth pressing solenoid 42 is driven via a drive circuit 40 so as to allow a cloth presser to be lowered. They are then judges whether or not a cycle original point is detected, and whether or not a needle upper position is detected, and an answer for both of them is 'YES', it is judged that the device is in a cycle needle number automatic setting mode, and in this case, the cycle needle number count mode is set so as to allow a low speed cycle operation to be carried out. A needle number is then measured so as to be counted, and when a cycle original point is detected, an one-rotation signal is thereby produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a cycle sewing machine having a cloth feed cam for controlling the cloth feed so as to form a sewing pattern of a predetermined shape by rotating a sewing machine main shaft, and more particularly, to an overrun of the sewing machine. The present invention relates to a control device for a cycle sewing machine that prevents the above and protects the sewing machine mechanism.

[0002]

2. Description of the Related Art Conventionally, in a cycle sewing machine which performs constant shape sewing with a cam, the number of sewing needles for one cycle (the number of cycle needles) varies depending on the feed cam shape, and its stop position is determined.

FIG. 1 is a perspective view showing a part of a control device incorporated in a conventional cycle sewing machine.

In FIG. 1, 10 is a cloth feed cam,
One cycle is completed in one cycle. The stop position is determined by the hand movement pattern of the cloth feed cam, and when the cloth feed cam makes one round, the automatic thread trimming mechanism 16 operates before the origin position, and is adjusted so as to always stop at the origin position.

A deceleration sensor detector 12 is mounted on the cloth feed cam 10, is adjusted to be detected a few stitches ahead of the cycle origin (stop position), and is detected by the deceleration sensor 14. It

In these configurations, when the pedal is depressed, as shown in the timing chart of FIG. 2, the sewing machine is rotated at a high speed to start the sewing machine.

Thereafter, as shown in, for example, Japanese Utility Model Laid-Open No. 4-17767, when the deceleration sensor 14 detects the deceleration sensor detector 12 after sewing several stitches, the sewing machine motor is decelerated to a decelerated rotation. The set number of stitches is sewn and stopped, and the sewing work for one cycle is completed.

[0008]

However, in the above-mentioned prior art, since the deceleration timing of the sewing machine motor for one cycle depends on the deceleration sensor attached to the cloth feed cam,
If the number of cycle stitches does not match the cam shape of the sewing machine body (misalignment of the number of cycle stitches), the machine cannot be stopped correctly at the origin, and the sewing product is also defective. In addition, in the final process of one cycle, the automatic thread trimming mechanism (16 in FIG. 1) has a problem that the sewing machine motor operates at a high speed, resulting in damage to the sewing machine main body.

Further, when the deceleration sensor fails, the deceleration point is not found, so that there is a problem that the sewing machine is in a runaway state where it keeps rotating at high speed. At this time, not only the above-mentioned troubles but also a dangerous situation for the operator will be involved.

Further, in adjusting the input timing of the deceleration sensor, it is necessary to allow a sufficient time for the motor to decelerate, and it is necessary to mount the motor 3 to 7 stitches before the cycle origin, which is the stop position. In this case, when the sewing machine feeds several stitches by hand, power is turned off while the sewing machine is rotating, or an emergency stop occurs, the position of the cloth feed cam of the sewing machine is positioned between the deceleration sensor and the cycle origin, such as the position of point A in FIG. When the pedal is stepped on from the state where the sewing machine is started, the deceleration point is not found, so it cannot stop at the origin of the immediately adjacent cycle and overruns as described above, and the automatic thread trimming mechanism operates at a higher speed. There is a problem that a mechanical part may be damaged or an unpleasant sound may be generated.

The present invention has been made to solve the above-mentioned conventional problems. By storing a cycle stitch number automatic setting mode in a non-volatile memory by a function of automatically determining the cycle stitch number. A first object of the present invention is to provide a control device for a cycle sewing machine which can automatically and correctly detect the number of cycle needles and therefore can prevent a mistake in setting the number of cycle needles.

Further, in response to a sewing machine start command during a cycle in which the feed position is not at the origin position, the sewing machine is rotated at a low speed to return the feed to the origin position, prevent overrun, and protect the sewing product and the sewing machine mechanism. A second object of the present invention is to provide a control device for a cycle sewing machine that can be used.

[0013]

SUMMARY OF THE INVENTION The present invention is a control of a cycle sewing machine having a cloth feed cam for controlling cloth feed so as to form a sewing pattern of a predetermined shape by one rotation corresponding to a predetermined number of rotations of a sewing machine spindle. In the apparatus, detection means for detecting one rotation of the cloth feed cam and generating one rotation signal, needle position detection means for detecting a predetermined needle position during one rotation of the sewing machine spindle, and generating a needle position signal, The number of needles counting means for counting the needle position signal during one rotation of the cloth feed cam, the storage means for storing the count value when the one rotation signal is generated, and the number of cycle needles is determined by the stored count value. Means for providing the first
Has achieved the purpose of.

The present invention also relates to a cycle sewing machine controller having a cloth feed cam for controlling the cloth feed so as to form a sewing pattern having a predetermined shape by one rotation corresponding to a predetermined number of rotations of the sewing machine main shaft. With the detection means, when starting from other than the cycle origin, by returning to the cycle origin while rotating the motor at low speed,
The second object is achieved.

[0015]

According to the present invention, when the sewing machine starting pedal is depressed, the sewing machine control device causes the sewing machine to rotate at a predetermined rotation speed. At this time, the detection means for detecting one rotation of the cloth feed cam detects one cycle, and the needle position detection means detects the needle up position or the needle down position to determine the number of stitches in one cycle. Counting is performed by the counting means to determine the number of cycle needles. The determined number of cycle needles is stored in the memory, and the normal operation mode is restored.

Further, according to the present invention, by having the cycle origin detecting means, when the sewing machine is started in the middle of the cycle, the motor is rotated at a low speed to detect the origin position of the feed, and the operation is stopped there. Prevent
The sewing product and the sewing machine mechanism can be protected.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 3 is a perspective view showing an outline of a sewing machine controlled by a motor.

In FIG. 3, the sewing machine 18 has a sewing machine main body 22 mounted on an operation console 20. A motor 24 (servo motor or electromotor, etc.) and a sewing machine controller (motor / sewing machine controller) 26 are arranged below the operation console 20, and a pedal 28 is connected to the sewing machine controller 26.

The sewing machine main body is a cycle sewing machine capable of repeatedly executing the same sewing pattern by using the cloth feed cam corresponding to the sewing pattern. Are different.

FIG. 4 is a block diagram showing the sewing machine controller 26.

In FIG. 4, the sewing machine controller 26 mainly comprises a sewing machine controller 30 and a motor controller 32, which are a central processing unit (CPU), a read only memory (ROM) and a random access memory ( R
AM), non-volatile read only memory (EEPRO
M), an input / output device (I / O), and the like.

Further, in FIG. 4, 34 is the sewing machine motor 2.
4, a motor drive circuit for driving 4, a cycle needle number automatic setting means, 38 a pedal sensor for checking whether or not the pedal is depressed, 40 a presser foot solenoid drive circuit, 42 a presser foot solenoid, and 44 a cycle origin detection 46, a sewing machine needle position detector, 48 a motor speed detector (encoder), and 50 an error display means.

The operation of the sewing machine controller 26 of this embodiment will be described below with reference to the flow charts of FIGS.

FIG. 5 is a main flow chart showing the general control of the sewing machine controller 26.

First, when the power is turned on, an initial process is performed in step 500. Here, as shown in FIG. 6, in step 600 after the general initial processing, whether or not the automatic setting of the cycle stitch number is selected is inputted by the cycle stitch number automatic setting means 36 and stored in the nonvolatile memory. I'll do it. The cycle stitch number automatic setting means 36 is composed of a switch or the like on the sewing machine controller 26, and an operator can select whether or not to select the automatic setting.

If the automatic setting of the number of cycle stitches is selected, the number of cycle stitches stored in the non-volatile memory is cleared in step 602, and the process returns to the main flow. As a result, until the number of cycle stitches is automatically set,
This cycle stitch number automatic setting mode is maintained.

If the automatic setting of the number of stitches for cycle is not selected, the process immediately returns to the main flow.

Next, in step 502 of FIG. 5, it is checked whether or not the pedal 28 is depressed by the pedal sensor 38. When the pedal 28 is depressed and the pedal sensor 38 is turned on, in the next step 504, the cloth pressing solenoid drive circuit 40 drives the cloth pressing solenoid 42 to lower the cloth pressing.

Next, in step 506, it is determined whether the cycle origin has been detected and whether the needle up position has been detected in step 508.

The cycle origin detecting means 44 for detecting the cycle origin is, as shown in FIG.
The origin sensor 54 is provided, and the origin detection unit 52 detects the origin sensor 54 to detect the origin.

Further, needle up detection (or needle down detection) is performed by a sewing machine needle position detector 46, which is also incorporated in the sewing machine pulley 56 shown in FIG. 7, in accordance with the rotation of the sewing machine main shaft 58. Is detected for each rotation.

Here, when the cycle origin and the needle up are detected, if it is determined in the next step 510 that the mode is the cycle stitch number automatic setting mode, the cycle stitch number counting mode is set in step 512 and step 51
4. Enter the low speed (speed at which immediate stop is possible) cycle operation.

FIG. 8 shows a flowchart of the low speed cycle operation.

In FIG. 8, first, in step 800,
The motor encoder counter in the RAM is cleared, the stitch number counter is cleared in step 802, and step 80
At 4, the low speed rotation command is output to the motor control means 32 of FIG. When the motor control means 32 receives a command from the sewing machine control means 30, the motor control means 32 discriminates the command and the motor speed detector (encoder) 48 attached to the rotary shaft of the motor.
The motor drive command signal is applied to the motor drive circuit 34 so that the motor speed from the motor 24 matches the command speed.
To rotate. When the motor 24 rotates, the main shaft 58 of the sewing machine body also rotates via the belt.

Next, in step 806, the sewing machine needle position detector 46 detects the upper end of the needle as shown by the arrow ↑ point of the needle up signal in FIG. Count up the counter. Thereby, the number of hand movements can be counted. In step 810, the motor encoder counter is cleared.

If the needle upper end is not detected in the determination at step 806, for example, at point B in FIG. 9, the process goes to step 812 to check whether the needle position detector 46 is out of order. That is, the motor 24
Since a motor encoder signal is input from the motor speed detector 48 every time the motor rotates, the encoder counter is incremented. At this time, if the needle position detector 46 is out of order, the encoder counter will not be cleared because the next needle upper end is not detected forever.

Therefore, in step 814, a needle up detection error is detected by checking whether this encoder counter has exceeded an abnormal value. If no error is detected, the process returns to step 806, and if an error is detected, the error display means 50 such as the display panel on the sewing machine controller 26 is used to notify the operator and the motor 24 is stopped in step 816. At this time, an alarm may be sounded to notify the operator.

After the error is displayed, the operation jumps to step 826 to stop the motor.

Further, the number of stitches is counted, and in step 818, one rotation of the cloth feed cam, that is, the cycle origin is detected and a one rotation signal is generated. Further, when it is determined in the next step 820 that the mode is the cycle stitch number counting mode, the value of the stitch number counter counted on the basis of one rotation signal is stored in the nonvolatile memory as the cycle stitch number in step 822, and in step 824,
The cycle stitch number automatic setting mode and the cycle stitch number counting mode are cleared, and in step 826, the motor is stopped by the one rotation signal. Note that FIG. 9 shows an example of 30 needles in one cycle.

Next, returning to the main flow of FIG. 5, in step 518, the cloth presser is driven to rise and one cycle is completed. High-speed cycle operation will be possible from the next time.

If it is determined in step 510 of the main flow that the mode is not the cycle stitch number automatic setting mode, high-speed cycle operation is started in step 516.

FIG. 10 shows a flowchart of the high speed cycle operation.

In the high-speed cycle operation, when the pedal is stepped on, the cloth presser is lowered to confirm that the origin of the cycle and the needle are on, and then the high-speed cycle operation mode is entered.

In step 1000 of FIG. 10, the motor encoder counter is cleared for the needle up detection error check, and in step 1002, the cycle needle number is loaded from the non-volatile memory and saved in the needle number counter. In the next step 1004, a high speed rotation command is issued to the motor 24.

Similar to FIG. 9, FIG. 11 is a timing chart showing an example of 30 needles in one cycle.

In step 1006, as shown in FIG. 11, every time the needle upper end is detected, the number of stitches counter is counted down in step 1008, and the motor encoder counter is cleared in step 1010.

Next, at step 1012, it is judged whether the number of stitches counter is, for example, 3 stitches or less, and if it is not 3 stitches or less, the process returns to step 1006 and the above operation is repeated 3 times.
If the number of stitches is less than or equal to the number of stitches, and the stitch number counter is still not 0 in the determination in step 1014, a low speed command is issued to the motor in step 1016, the motor is decelerated so that it can be stopped immediately, and when the stitch number counter reaches 0, step 1018, the motor 24 is stopped, and step 5 of the main flow of FIG.
Returning to 18, the work clamp is lifted to complete one cycle.

When there is a detection error in the needle upper end detection in step 1006, steps 1020, 10
In 22 and 1024, the same error check processing as in low speed rotation is performed.

In addition, step 506 or 50 in FIG.
In step 8, if it is determined that the needle has been fed several times by hand rotation, etc., and it is determined to start halfway from a position deviating from the cycle origin or a position other than the needle upper end, as in the cycle stitch number automatic setting mode, At 514, low speed cycle operation is entered. At this time, since it is not possible to count the number of stitches in one cycle because it is started from the middle, the cycle stitch number count mode is not set even in the automatic cycle stitch number setting mode, and the normal deceleration cycle operation mode is set.

In this low-speed cycle operation, when the cycle origin is detected, the motor 24 is stopped, the process goes to step 518, the work clamp is raised, and the cycle is ended. This enables high-speed cycle operation from the next time.

In the above embodiment, one cycle of the cloth feed cam is detected by detecting one rotation of the cloth feed cam from the position where the cycle origin is detected, but the invention is not limited to this. It is clear that this is good.

A sensor means (detection means 44 or another sensor) for detecting the needle top dead center position after the thread cutting mechanism (16 in FIG. 1) is operated is provided, and the detection of one cycle of the cloth feed cam is performed by the sensor means. Of the cloth feed cam from the detected position, or by detecting one rotation of the cloth feed cam from the position detected by the sensor means after rotating from any position of the feed cam. You can The detecting means for detecting one rotation of the cloth feed cam is formed by the detecting means 44 or the sensor means.

Further, in this embodiment, since both the function of determining the number of stitches of the cycle and the function of returning to the origin of the cycle are provided, it is possible to prevent the overrun of the sewing machine and protect the function of the sewing machine. Obviously, the function of may be omitted.

[0055]

As described above, according to the present invention, the cycle stitch number automatic setting mode is stored in the non-volatile memory so that the controller can be set to any sewing machine head having any number of cycle stitches. Even if there is, the number of cycle stitches is automatically entered and the number of cycle stitches can be detected correctly, so it is possible to perform appropriate acceleration, deceleration, and stop control. However, you can surely stop at the cycle origin every time,
Since it is possible to prevent the sewing machine from spinning around at high speed, it is possible to prevent the sewing products from being damaged, prevent damage to the sewing machine mechanism, and provide the operator with a comfortable working environment. Have.

Further, even if the engine is started from outside the cycle origin, since it operates at a low speed, it can be stopped at the origin whenever the cycle origin is found, and overrun can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overview of a conventional sewing machine control device.

FIG. 2 is a time chart showing waveforms of various signals during one sewing cycle by a conventional sewing machine controller.

FIG. 3 is a perspective view showing an overview of a cycle sewing machine to which this embodiment is applied.

FIG. 4 is a block diagram showing a control device for a cycle sewing machine according to this embodiment.

FIG. 5 is a flowchart showing the basic operation of the control device for the cycle sewing machine according to this embodiment.

FIG. 6 is a flowchart showing the initial processing of FIG.

FIG. 7 is a perspective view showing an overview of a control device for a cycle sewing machine according to this embodiment.

FIG. 8 is a flowchart showing the operation of the low speed cycle operation according to the present embodiment.

FIG. 9 is one of the control devices for the cycle sewing machine according to the present embodiment.
Time chart showing the waveforms of various signals during the sewing cycle

FIG. 10 is a flowchart showing the operation of the high speed cycle operation according to the present embodiment.

FIG. 11 is a time chart showing waveforms of various signals by the control device for the cycle sewing machine according to the present embodiment, similar to FIG.

[Explanation of symbols]

 24 ... Sewing machine motor 30 ... Sewing machine control means 32 ... Motor control means 36 ... Cycle needle number automatic setting means 38 ... Pedal sensor 44 ... Cycle origin detector 46 ... Sewing needle position detector 48 ... Motor speed detector 52 ... Origin detector 54 ... Origin sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location D05B 69/26 7152-3B

Claims (2)

[Claims] 1. A cycle sewing machine controller having a cloth feed cam for controlling cloth feed so as to form a sewing pattern of a predetermined shape by one rotation corresponding to a predetermined number of rotations of a sewing machine spindle. Detection means for detecting one rotation and generating one rotation signal, needle position detecting means for detecting a predetermined needle position during one rotation of the sewing machine spindle, and generating a needle position signal, and one during one rotation of the cloth feed cam A needle number counting means for counting the needle position signal; a storage means for storing a count value when the one rotation signal is generated; and a means for determining a cycle needle number based on the stored count value. The control device of the cycle sewing machine that features. 2. A cycle sewing machine control device having a cloth feed cam for controlling cloth feed so as to form a sewing pattern of a predetermined shape by one rotation corresponding to a predetermined number of rotations of the sewing machine spindle. A control device for a cycle sewing machine, which is provided with the function of returning to the cycle origin while rotating the motor at a low speed when starting from a position other than the cycle origin.