JPH11156078A - Sewing machine driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine driving device capable of suppressing the fluctuation of a speed setting voltage when a contact defect is generated and using a variable resistor for a period longer than a service life. SOLUTION: A voltage Vp from a variable resistor 17 is inputted through a storage means 24 to a command means 25 and the storage means 24 stores the voltage Vp while updating it. When a contact defect detection means 23 for monitoring the voltage Vp detects the abnormal decline of the voltage Vp and judges a contact defect, the updating of the storage means 24 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine driving device for controlling the rotation of an industrial sewing machine and the mechanism of the sewing machine.

[0002]

2. Description of the Related Art Generally, an operator who operates a sewing machine operates the sewing machine with a foot pedal in order to hold a sewing product with both hands.

The construction and operation of the sewing machine and the sewing machine driving device will be described below with reference to FIG. 2 and FIGS.

In FIG. 2, a sewing machine 1 is driven by a motor 5 via a sewing machine pulley 2, a belt 3, and a motor pulley 4. The rotation of the motor 5 and the solenoids 6a, 6b, 6c and the like of various mechanical parts of the sewing machine such as a thread cutting mechanism are controlled and driven by the control device 7. In addition, a fixed position stop operation of the sewing machine, a control of the number of stitches, and the like are performed by the signal ND / NU of the position detector 8 provided in the sewing machine 1. The control device 7 has a pedal sensor 9, the lever of which is connected to the pedal 11 by a connecting rod 10. The pedal sensor 9 is
As shown in FIG. 23, the connecting rod 10 is provided on one side of the lever A12.
Is connected to the pedal 11 via a motor, and a change in rotation angle on the other axis A13 side is converted into an electric signal by a variable resistor, a magnetoresistive element, a photoelectric element, or the like. Further, since the angle change of the axis A13 is usually a small value of ten and several degrees, it is general that the angle is mechanically expanded and converted into a relatively large change of an electric signal. FIG.
(A) is an example of this, and the change of the lever A12 is the pin A14.
Through the lever B15 to rotate the shaft B16 that supports the lever B15. This angle change is caused by the pin A1
It is enlarged according to the ratio of 4 to the distance between each axis. The axis of the variable resistor 17 is connected to the axis B16, and the voltage change due to the angle change is output as the operation voltage Vp. The control device 7 connects the operation voltage Vp to 0 V through a resistor Rpd and inputs the operation voltage Vp to the command means 18. The command means 18 transmits the operation voltage Vp to the drive means 19 and the control means 20 as a command voltage Vcom. The driving means 19 is provided with a command voltage Vc.
om, the motor sensor 21 provided in the motor 5 and the signal ND / NU from the position detector 8 are input to drive the motor 5 while controlling the speed. The control means 20 controls the command voltage Vc
om and ND / NU, and the solenoids 6a and 6 for controlling the motor 5 and driving the mechanism of the sewing machine via the driving means 19.
b, 6c, etc. are controlled.

Here, when the operator steps on the pedal 11, the pedal sensor 9 outputs a signal corresponding to the amount of depression, and the control device 7 drives the motor 5 at a rotation speed corresponding to the amount of depression of the pedal 11. When the pedal 11 is returned to the neutral position, the control device 7 applies a brake to the motor 5,
The needle is stopped at the needle position determined by the position detector 8. Further, when the pedal 11 is depressed to the heel side, the control device 7 controls the thread cutting mechanism 6a of the sewing machine 1, the cloth holding mechanism 6c, and the like. As shown in FIG. 25, the pedal sensor 9 outputs an operation voltage Vp corresponding to the depression amount of the pedal 11, that is, the rotation angle of the variable resistor 17. Further, as shown in FIG. 26, the command means 18 outputs the operation voltage V from the pedal sensor 9.
The value of p is identified, and the motor 5 is controlled via the driving means 19, or the various solenoids 6a, 6b, 6c, etc. of the sewing machine 1 are controlled via the control means 20. For example, in FIG. 26, the voltage at which the operating voltage Vp is equal to or less than v1 is “two steps of pedal depression”.
State, exceeding v1 and below v2 is "one step of pedal return"
, The voltage in the vicinity of v3, that is, the voltage exceeding v2 and v4 or less is determined to be the state of "pedal neutral", and the voltage exceeding v4 is determined to be the state of "stepping on". Further, when v4 is exceeded, the sewing machine is operated at a speed corresponding to the Vp voltage.

[0006]

In the conventional sewing machine drive described above, a non-contact type or variable resistor using magnetism or light is used as a pedal sensor system for converting pedal operation into an electric signal. The contact type used is known. The former can guarantee a long life but is expensive, and the latter can be realized at a low cost with a simple structure, but has a short life. Some variable resistors guarantee an electrical life of 10 million times, but are expensive and uncommon. In general, the mechanical life of a variable resistor is much longer than the electric life, and the electric life is almost always determined by poor contact of the sliding part. Therefore, it can be said that the life of the variable resistor depends on the occurrence of poor contact of the sliding portion. FIG. 27 shows the relationship between the amount of depression of the pedal 11, that is, the rotation angle of the variable resistor, and the output voltage Vp. In the example of the pedal sensor 9 using the variable resistor of the sewing machine driving device shown in FIG. 23 described above, the output Vp of the variable resistor 17 is pulled down by Rpd, and as shown in FIGS. In addition, the output voltage Vp partially decreases at the portion where the contact of the variable resistor 17 is defective. The degree of reduction differs depending on the degree of progress of the contact failure. For example, A changes the Vp voltage from v6 to v5,
The speed rapidly changes from s3 to s2 in FIG. Also,
B) Stops momentarily because the Vp voltage changes from v5 to v3 and the pedal becomes neutral during operation at the speed of s2. Further, since the Vp voltage is reduced from v7 to v1 or less and the vehicle is depressed twice at the maximum speed at the s4 speed during driving, the thread trimming operation is executed. This phenomenon such as B or C is a malfunction, and the function as the sewing machine driving device is lost.

Here, it is obvious that if there is a means for relieving a contact failure of the variable resistor, an inexpensive and long-life pedal sensor can be realized. JP-A-63-157519 and JP-A-64-44378 are known as contact failure detecting means and contact failure relief means. In the former, the range of change in the variable resistor is made narrower than the power supply voltage as contact failure detection means, and when a voltage outside the range of change is output, it is determined that contact failure has occurred, and a predetermined value is output. is there. The latter is intended to stop the function when the change range of the variable resistor is narrow, by detecting that the voltage deviates from a preset value.

However, the operating speed of the sewing machine speed is 200 r / min for the s1 speed in FIG. 26 and 6000 r / min for the s4 speed in FIG.
min and a very wide change range.
Even if the technique disclosed in Japanese Patent Application Laid-Open No. 3-157519 is applied and a command of an intermediate speed of 3000 r / min is issued at the time of a contact failure, if the defective portion is near s1 or s4, 200 r / min to 3000 r / min will be used. min or 6000 r / min to 3000 r / min,
A command to change 3000 r / min is issued,
Normal use is not possible. As a pedal sensor of a sewing machine using a variable resistor, that is, a speed setting device, it is required that a serious malfunction does not occur even if a contact failure occurs and that a smooth motor speed command is maintained.

[0009]

A sewing machine driving device according to the present invention comprises a control device for controlling a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation to the control device. The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a contact failure detection unit, a storage unit, and a command unit. A signal is monitored, and when the contact of the variable resistor is good, the operation means is made to store the operation signal while updating the operation signal, and when the variable resistor has a bad contact, the sewing machine operation of the control device is performed. And a signal for instructing the drive to stop, the sewing machine operation being controlled by an operation signal processed by the storage means or the instruction means.

According to the present invention, there is provided a pedal sensor which can use an inexpensive variable resistor stably for a long period of time since the use of the variable resistor until the occurrence of a contact failure does not greatly affect the sewing machine operation. be able to.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention comprises a control device for controlling a sewing machine operation and a motor for driving a sewing machine, and a speed setting device for instructing the control device to perform a sewing machine operation and a drive stop.
The speed setting device includes a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a contact failure detection unit and a display unit, and the contact failure detection unit monitors the operation signal and performs the variable operation. When the resistor has a bad contact, the display means displays the bad contact. When the bad contact occurs in the variable resistor, the variable resistor has a function of being recognized by the display.

A control device for controlling the sewing machine operation and a motor for driving the sewing machine includes a speed setting device for instructing the control device to perform the sewing machine operation and the drive stop. The speed setting device outputs an operation signal corresponding to the operation of the worker. A variable resistor for outputting, the control device includes a contact failure detection unit and a storage unit, the contact failure detection unit monitors the operation signal, and when the contact of the variable resistor is good, the storage unit The control device operates to store the operation signal while updating the operation signal, and the stored signal in the control device controls the sewing machine operation and the sewing machine driving motor, and detects a contact failure of the variable resistor. In this case, since the voltage immediately before the poor contact is used as the speed command, the sewing machine can be operated with minimum speed discontinuity.

A control device for controlling a sewing machine operation and a motor for driving the sewing machine includes a speed setting device for instructing the control device to perform a sewing operation and a drive stop, and the speed setting device outputs an operation signal corresponding to an operation of an operator. A variable resistor for outputting, the control device includes a contact failure detection unit, a voltage change rate detection unit, a storage unit, and a first command unit, wherein the contact failure detection unit monitors the operation signal and monitors the operation signal. When the variable resistor has a bad contact, it outputs a bad contact detection signal, and when the good contact of the variable resistor is good, it acts to store the operation signal in the storage means while updating the operation signal, and provides a voltage change rate. The detecting means detects a change rate of the operation signal voltage, and the first command means changes the change rate at the change rate based on a signal from the storage means when the contact failure detection signal is output. A command voltage calculated so as to perform the operation, and when there is no contact failure detection signal, the signal from the storage means is used as the command voltage to control the sewing machine operation and the motor that drives the sewing machine. Since the previous operation voltage change is calculated by extrapolation at the time of poor contact and a speed command is issued, there is an effect that a smoother sewing machine speed can be set.

A control device for controlling the sewing machine operation and a motor for driving the sewing machine includes a speed setting device for instructing the control device to perform a sewing operation and a drive stop. The speed setting device outputs an operation signal corresponding to an operation of an operator. A variable resistor for outputting, the control device includes a contact failure detection unit, a storage unit,
A second command unit, wherein the contact failure detection unit monitors the operation signal and turns on the contact failure detection signal when the variable resistor is in a contact failure, and the contact of the variable resistor is good. At this time, the second command means operates to store the operation signal in the storage means while updating the operation signal, and the second command means changes the contact failure detection signal from OFF to ON when the contact failure detection signal is OFF. When the signal from the storage means is output as a command voltage, and when the contact failure detection signal returns from ON to OFF, the difference between the immediately preceding command voltage and the signal from the storage means is changed with time. It is designed to output the decreasing command voltage to control the sewing machine operation and the motor for driving the sewing machine. That.

A control device for controlling a sewing machine operation and a motor for driving the sewing machine includes a speed setting device for instructing the control device to perform a sewing operation and a drive stop, and the speed setting device outputs an operation signal corresponding to an operation of an operator. A variable resistor for outputting, the control device includes a contact failure detection unit, a storage unit,
A third command unit, wherein the contact failure detection unit monitors the operation signal and turns on the contact failure detection signal when the variable resistor has a contact failure, and the contact of the variable resistor is good. At this time, the third instruction unit operates to store the operation signal while updating the operation signal in the storage unit, and the third instruction unit stores the operation signal when the contact failure detection signal is in an off state or when the contact failure detection signal is turned on from off. The signal from the means is output as a command voltage for controlling the sewing machine operation and the motor for driving the sewing machine, and when the contact failure detection signal is turned off from on, the command voltage is immediately before the signal from the storage means. The error from the command voltage is maintained during the increase or decrease of the signal from the storage means, and when the signal changes from increase to decrease or from decrease to increase, the command error is maintained. Are those of the pressure has a structure to sustain until it matches the signal from said memory means, when returning from the contact failure, an effect that there is no impact due to abrupt speed change for not returned to forcibly operating voltage.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine includes a speed setting device for instructing the control device to perform a sewing operation and a drive stop, and the speed setting device outputs an operation signal corresponding to an operation of an operator. A variable resistor for outputting a signal, the control device comprising: a contact failure detecting means; a storage means;
Command means, the contact failure detecting means monitors the operation signal and outputs a contact failure detection signal when the variable resistor has a contact failure, and stores the memory when the contact of the variable resistor is good. The fourth command means receives a signal from the storage means and outputs the command signal as a command voltage for controlling a sewing machine operation and a sewing machine driving motor. When the contact failure detection signal continues for a predetermined time or more, the command voltage is increased or decreased. When the variable resistor is continuously used at the position of the contact failure, the voltage changes, so that the operator changes the voltage. Has the effect of jumping and using a poorly contacted part to depress or return the pedal naturally.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a contact failure detection unit and a first warning unit, and the contact failure detection unit outputs the operation signal. Monitoring, when the operation signal is lost due to the contact failure of the variable resistor, sends a contact failure detection signal to the first warning means, the first warning means monitors the operation signal, A warning is issued when the number of faulty contact points on the device exceeds a predetermined number.When the faulty contact point spreads and it is likely that it will not be able to withstand actual use, a warning is issued and replacement of the variable resistor is required. It has a stimulating effect.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a contact failure detection unit and a second warning unit, and the contact failure detection unit outputs the operation signal. Monitoring, when the operation signal is missing due to the contact failure of the variable resistor, sends a contact failure detection signal to the second warning means, the second warning means monitors the operation signal, and starts the sewing machine operation. A warning is issued when a contact failure of the variable resistor occurs in a specific area concerned, and has an effect of preventing a serious malfunction relating to the sewing machine operation.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a poor contact detection unit and a third warning unit, and the poor contact detection unit outputs the operation signal. Monitoring, when the operation signal is lost due to the contact failure of the variable resistor, sends a contact failure detection signal to the third warning means, the third warning means monitors the operation signal, and the variable resistor A warning is issued when the poor contact point includes a specific operation signal related to the threshold value of the sewing machine operation, and has an effect of preventing a serious malfunction related to the sewing machine operation.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The speed setting device has a variable resistor that outputs an operation signal according to the operation of the operator, the control device includes a contact failure detection unit and a fourth warning unit, and the contact failure detection unit outputs the operation signal. Monitoring, when the operation signal is lost due to a contact failure of the variable resistor, sends a contact failure detection signal to the fourth warning means, the fourth warning means monitors the operation signal, and the variable resistor A warning is issued when the total of the missing voltage of the operation signal exceeds a predetermined value due to a contact failure. It has the effect of promoting replacement of the container.

A control device for controlling the sewing machine operation and a motor for driving the sewing machine; and a speed setting device for outputting an operation signal for instructing the control device to perform the sewing machine operation and the drive stop.
The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a contact failure detection unit, a warning unit, and a fifth command unit, and the contact failure detection unit includes the contact failure detection unit. When the operation signal is monitored, and the operation signal is lost due to the contact failure of the variable resistor, a contact failure detection signal is sent to the warning unit, and the warning unit monitors the operation signal, and contacts the variable resistor. When the number of defective portions exceeds a predetermined number, a warning is issued, and the fifth command means outputs the operation signal by the warning as a command voltage for only a constant speed operation at a predetermined speed and a stop, and the sewing machine drive The motor is controlled with the same function as a so-called clutch motor, which only stops driving when the contact point of the variable resistor spreads and the function as a variable speed motor is no longer exhibited. Because that can, period until replacing the variable resistor also has an effect that can continue the operation of the sewing machine.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for instructing the control device to perform the sewing machine operation and the drive stop.
The speed setting device has a variable resistor that outputs an operation signal according to the operation of the operator, the control device includes a fifth warning device, and the fifth warning device monitors the operation signal and performs an operation. The number of changes in signal increase / decrease is counted, and a warning is issued when the number of changes exceeds a predetermined number. The function is to count the number of times the variable resistor slides and estimate the replacement time.

A control device for controlling the sewing machine operation and a motor for driving the sewing machine; and a speed setting device for outputting an operation signal for instructing the control device to perform the sewing machine operation and the drive stop.
The control device has a sixth command means and a sixth warning means, the speed setting device has a variable resistor for outputting an operation signal according to an operation of an operator, and a region selecting means, The variable range is an integral multiple of the operator's operation range, the area selection means can select which part of the variable range the operation range uses, and the sixth command means corresponds to the selected operation range. The sewing machine operation and the motor for driving the sewing machine can be controlled by switching the operation input range in accordance with the operation signal to be performed, and the sixth warning means monitors the operation signal, and the operation signal is out of the operation input range. When the variable resistor becomes unable to withstand actual use due to poor contact, an unused sliding surface can be used twice or more times.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The control device has first level switching means, amplification means, and seventh command means, and the speed setting device has a variable resistor for outputting an operation signal according to an operation of an operator, and a region selection means, The variable range of the variable resistor is an integral multiple of the operation range of the operator, and the area selecting means can select which part of the variable range is used for the operation range.
The level switching means adds or subtracts a constant voltage to the operation signal corresponding to the selected operation range so as to be within the input range of the amplification means, and the amplification means converts the signal from the level switching means to the And the seventh command means controls the sewing machine operation and the motor for driving the sewing machine in the control device. When it is no longer tolerable, there is an effect that an unused sliding surface can be used twice or more times.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The control device has a second level switching means, a seventh warning means, and a seventh command means, and the speed setting device has a variable resistor for outputting an operation signal according to an operation of an operator and a region selecting means. The variable range of the variable resistor is an integral multiple of the operation range of the operator, the area selection means can select which part of the variable range the operation range uses, and the seventh warning means The operation signal is monitored, and a warning is issued when the operation signal is out of the command input range of the seventh command means. The second level switching means transmits the operation signal when the warning is issued. The seventh command means receives the output of the second level switching means and controls the sewing machine operation and the motor for driving the sewing machine. Device is in poor contact and When no longer endure, an effect of the number of times more than twice using the sliding surface of unused available.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device.
The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a vibration detection unit and a display unit, and the vibration detection unit monitors the operation signal and performs a predetermined vibration. When the voltage change of more than a number occurs continuously, it is displayed by the display means, and has an effect of indicating that harmful micro-vibration has occurred on the sliding surface of the variable resistor.

A control device for controlling the sewing machine operation and a motor for driving the sewing machine; and a speed setting device for outputting an operation signal for instructing the control device to perform the sewing machine operation and the drive stop.
The speed setting device has a variable resistor that outputs an operation signal according to an operation of an operator, the control device includes a vibration detection unit, a display unit, and an eighth command unit, and the vibration detection unit outputs the operation signal. When a voltage change of a predetermined frequency or more is monitored continuously, the voltage change is indicated by the display means, and the motor speed is increased or decreased by an eighth command means. When harmful micro-vibration occurs on the sliding surface, the motor speed is changed to avoid the resonance point.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine; and a speed setting device for outputting an operation signal for instructing the control device to perform the sewing machine operation and the drive stop.
The speed setting device has a variable resistor and an operation lever that output an operation signal according to an operation of an operator, and the variable resistor and the operation lever are configured to be connected by a structure having an air gap, Even if the operation lever makes harmful fine vibrations to the variable resistor, there is an action of not transmitting the vibration to the variable resistor.

A control device for controlling the sewing machine operation and the motor for driving the sewing machine includes a speed setting device for instructing the control device to perform a sewing operation and a drive stop. The speed setting device outputs an operation signal corresponding to the operation of the worker. An output variable resistor, the control device includes a voltage change rate detecting means, and ninth command means, the voltage change rate detecting means detects a change rate of the operation signal voltage, and the ninth command means includes When the rate of change is equal to or less than a predetermined value, the operation signal is output as a command signal with a relatively small time constant, and when the rate of change is equal to or greater than a predetermined value, the operation signal is set as a command signal with a relatively large time constant. Output,
The command signal is configured to control the sewing machine operation and the motor for driving the sewing machine in the control device, and even if the operation voltage greatly changes due to poor contact of the variable resistor, the operation of reducing the change in the command voltage is reduced. is there.

The control device includes a control device for controlling the sewing machine operation and the motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop. The speed setting device outputs an operation signal corresponding to the operation of the worker. Output, the control device includes an operating voltage recognizing means and an eighth warning means, the operating voltage recognizing means monitors the operation signal, and when the operation signal outputs a constant value continuously for a predetermined time or more, The value and the time are stored for a predetermined number of times or more, and the value in which the accumulated time is longest and reaches the specified time or more is recognized as a neutral signal which is an operation signal when the operator does not operate anything, The warning means is configured to issue a warning when the neutral signal changes by a certain amount or more as compared with the neutral signal at a specific time, and has an operation of automatically detecting a change in the operating voltage with respect to the pedal depression amount.

The apparatus further comprises a control device for controlling the sewing machine operation and the motor for driving the sewing machine, and a speed setting device for instructing the control device to perform the sewing machine operation and the drive stop. The speed setting device transmits an operation signal corresponding to the operation of the worker. Output, the control device includes an operating voltage recognizing means and a command correcting means, the operating voltage recognizing means monitors the operation signal, and when the operation signal outputs a constant value continuously for a predetermined time or more, the value is compared with the value. The time is stored a predetermined number of times or more, and the value of the longest cumulative time and the value that has reached the specified time or more is recognized as a neutral signal that is an operation signal when the operator does not operate anything, and the command correction unit is
The control device corrects the voltage for commanding the sewing machine operation and the motor for driving the sewing machine in accordance with the change of the neutral signal, and has the function of automatically correcting the change of the operation voltage with respect to the pedal depression amount.

The storage means is configured to output a stop command when a contact failure detection signal is input in the vicinity of an operation voltage related to the stop of driving of the motor. Has the effect of preventing.

The first to fourth command means are configured to output a stop command when a poor contact detection signal is input in the vicinity of an operation voltage related to the stop of driving of the motor. This has the effect of preventing malfunction due to poor contact during operation.

Further, the fourth warning means monitors the operation signal,
A warning is issued when the missing voltage of the operation signal due to any one of the contact points of the variable resistor exceeds a predetermined value, and a warning is given that the variable resistor cannot be used due to the contact failure. Has the effect of doing.

The fourth warning means monitors the operation signal,
This is a configuration in which a missing voltage is estimated based on a time when an operation signal is lost due to a contact failure, and has a simple configuration to warn that the variable resistor has become unusable due to a contact failure.

The warning means is configured to generate a warning when a contact failure of the variable resistor occurs in a specific area related to the sewing operation of the operation signal, and a failure may occur in the sewing machine operation function. It has the effect of warning that there is a possibility.

The warning means is configured to generate a warning when the contact failure portion of the variable resistor includes a specific operation signal related to the threshold value of the sewing machine operation. Has the effect of warning that

The warning means is configured to give a warning when the total width of the contact failure portion of the variable resistor exceeds a predetermined value, so that the variable resistor is damaged until it cannot withstand actual use. There is an action to warn you.

The operation signal input of the contact failure detecting means is
The variable resistor is connected with a potential outside the voltage change range and a resistor, and the contact failure detection means monitors the operation signal and recognizes the variable resistor as a contact failure when detecting a potential outside the voltage change range. It has the function of detecting a contact failure with a simple configuration.

The control means has two power supplies, positive and negative, and the variable resistor is connected to one of the positive and negative power supplies. The operation signal input of the contact failure detecting means includes a resistor connected to a power supply having a polarity opposite to that of the variable resistor. And the contact failure detecting means is configured to monitor the operation signal and recognize the variable resistor as a contact failure when detecting a potential having a polarity opposite to that of the variable resistor power supply. In addition, even if the variable resistor is used up to around 0V, there is an operation of reliably detecting a contact failure.

Further, the contact failure detecting means monitors the operation signal, and recognizes that the variable resistor has occurred or has recovered from the contact failure when the voltage change is larger than a predetermined value. It has the function of detecting even a failure.

The axis of the variable resistor has a rectangular or regular polygonal cross section, and the area selecting means has a structure in which a structure for transmitting an operation of an operator to the axis has a shape fitting into the cross section of the axis. This has the effect that the sliding area can be changed with a simple structure.

Further, the area selecting means has a structure in which the speed setting device and the variable resistor can be mounted even when they are rotated at a fixed angle around the axis when the speed setting device and the variable resistor are mounted. It has the effect of changing the area.

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram of a sewing machine driving apparatus according to a first embodiment of the present invention, FIG. 2 is a diagram showing a general arrangement of a sewing machine and a sewing machine driving apparatus, and FIGS.
Shows a circuit diagram explaining the concept of the contact failure detection method,
FIG. 5 shows a flowchart for explaining the operation, and FIG. 6 shows a graph for explaining the operation.

The configuration of the sewing machine driving device according to the first embodiment of the present invention will be described with reference to FIGS.

In FIG. 2, the general arrangement of the sewing machine and the sewing machine driving device and the basic operation thereof are the same as those of the conventional example. Sewing machine 1
Is driven by a motor 5 via a transmission mechanism including a sewing machine pulley 2, a belt 3, and a motor pulley 4. The sewing machine 1 includes a position detector 8 that detects the needle position of the sewing machine by detecting the angle of the rotation axis of the sewing machine, and an automatic thread trimming mechanism, a reverse stitch mechanism, a cloth presser lifting mechanism, etc. (not shown) as the sewing machine operation. And is controlled by the control device 22 together with the driving of the motor 5. The operation voltage Vp from the pedal sensor 9 as a speed setting device is input to the control device 22.
The control device 22 includes a control unit 20, a drive unit 19, a contact failure detection unit 23, a storage unit 24, a command unit 25, and a display unit 26. Variable resistor 1 of pedal sensor 9
The operation voltage Vp from 7 is input to the faulty contact detection means 23 and the storage means 24, and the output of the faulty contact detection means 23 is input to the storage means 24, the command means 25 and the display means 26. The output Vm of the storage means 24 is inputted to the command means 25, and the output Vcom of the command means 25 is inputted to the control means 20 and the driving means 19. The control means 20 controls the sewing machine mechanism and the operation of the sewing machine, and the driving means 19 supplies power to the motor 5 to drive the motor 5 and the motor sensor 2
1 monitors and controls the speed of the motor 5. The signal ND / NU of the position detector 8 is input to the control means 20 and the driving means 19.

The operation of the first embodiment configured as described above will be described below. The operator operates the pedal 11, and the movement of the pedal 11 is transmitted to the control device 22 by the pedal sensor 9 as an operation voltage Vp. As described in the conventional example, the command means 25 instructs the drive means 19 to rotate the motor 5 at a speed proportional to the amount of depression of the pedal 11 by the operation voltage Vp when the operator depresses the pedal 11. . When the pedal 11 is returned to the neutral position, a command to stop the home position is issued to the driving means 19, the brake is applied to the motor 5, the speed is rapidly reduced, and the position of the needle lower position or the needle upper position by the position detector 8 is accurately determined. And a so-called fixed position stop is performed. In addition, pedal 1
When step 1 is stepped back to the heel side, the control means 20 drives a sewing machine mechanism (not shown) such as reverse stitch control, automatic thread trimming control, or cloth presser control.

FIGS. 3 and 4 are circuit diagrams for explaining the operation of the contact failure detecting means 23. FIG. 3 shows that when the resistance value of the variable resistor 17 is r and the variable range is r = r1 + r2 + r3, the pedal sensor having the mechanism shown in FIG. The rotation angle of the axis 17 is only in the range of about 60 degrees, and it is equivalently shown that the shaft slides only in the range of r2 of the total resistance r. Therefore, the minimum voltage Vpmin of the variable range r2 is Vpmin
= 5V × r3 / (r1 + r2 + r3). Also, V
Since p is connected to the 0V power supply by the resistor R, if the variable resistor 17 has poor contact, Vp drops to almost 0V. Here, when the comparator 26 detects a voltage equal to or lower than the minimum voltage Vpmin in the variable range r2, it can be determined that a poor contact has occurred. Further, when it is determined that the contact is poor, a contact failure detection signal FC is output.

FIG. 4 is a circuit diagram for explaining a detection method when the entire resistance of the variable resistor 17 is used as a variable range. The variable resistor 17 is connected between 0V and + 5V, and Vp is
To -5V via If the comparator 26 detects the negative Vp voltage, it can be determined that a poor contact has occurred.

FIG. 5 shows a contact failure detecting means 2 corresponding to FIG.
3 is a flowchart showing an outline when the microcomputer 3 processes the operations of the storage unit 3 and the storage unit 24.

The operation signal Vp is read by “read Vp”,
First, “Vp <Vpmi” as the contact failure detecting means 23
n "compares Vp with Vpmin. Vp> = Vpmi
In the case of n, the contact failure detection signal FC is turned off by setting "FC = 0", and Vp is stored in Vm of the storage means 24 by "Vm = Vp". At that time, since the value of Vm is updated, the voltage stored immediately before is erased. On the other hand, when Vp <Vpmin, it is determined that a contact failure has occurred, and “FC = 1” is output as a contact failure detection signal. At this time, the process returns to the main routine without storing Vp. Therefore, Vm stored immediately before is output to the command means 25 as it is.

The state of the output voltage Vm of the storage means 24 will be described with reference to FIG. The horizontal axis represents the amount of depression or return of the pedal 11, that is, the rotation angle of the variable resistor 17.
The output Vp of the variable resistor 17 is indicated by a solid line,
Is indicated by a dotted line. While the contact is good, Vm changes according to the pedal depression amount. In the section d where the contact failure occurs, the voltage immediately before the contact failure remains stored, so that a constant voltage is output. Return,
Vp at that time is newly stored and output.

The display means 27 receives the contact failure detection signal FC and blinks a pilot lamp (not shown) of the control device 22 in the first embodiment. In other words, the pilot lamp during operation remains lit, but blinks when a poor contact is detected to call attention of an operator or a maintenance person at the factory.

Although the voltage Vp is connected to 0 V or -5 V by the resistor R, it may be connected to another potential as long as it is outside the operating voltage range.

(Embodiment 2) FIG. 7 is a block diagram of a sewing machine driving apparatus according to a second embodiment of the present invention, and FIGS. 8, 9, 10, and 11 are time charts for explaining the operation thereof. is there.

The structure of the second embodiment is different from the first embodiment in that the control device 28 is provided with a change rate detecting means 29, and the operation of the command means 30 is different. The pedal sensor 9 outputs the operating voltage Vp from the variable resistor 17,
Vp is input to the contact failure detection means 23, the storage means 24, and the change rate detection means 29, and the output F of the contact failure detection means 23
C is input to the storage means 24, the display means 27 and the command means 30. The output Vm of the storage means 24 and the output Dv of the change rate detecting means 29 are inputted to the command means 30, and the command means 3
The output Vcom of 0 is input to the control means 20 and the driving means 19.

The operation of the second embodiment configured as described above will be described below. Change rate detecting means 29
Measures the change dv of the operating voltage Vp with respect to a fixed time dt as shown by dv / dt in FIG. 8 and, as in the case of the storage means 24, only when the poor contact detection signal FC is off (FC = 0), Is stored and output to the command means 30 as Dv. The command means 30 of the second embodiment can realize a plurality of operations. The first operation of the command means 30 will be described with reference to FIG. The first command operation is when the contact failure detection signal is turned off (FC
= 0), the output Vm of the storage means 24 is changed to the command voltage V
com is output. Contact failure detection signal is ON (FC
= 1), the output V of the storage means 24 shown in FIG.
m is the change rate Dv (=
dv / dt), the command voltage Vcom (FIG. 8)
To f).

The second operation of the command means 30 will be described with reference to FIG. In FIG. 9, a two-dot chain line indicates the amount of depression of the pedal 11, a solid line indicates the operation voltage Vp, and a dotted line indicates the storage unit 2.
4 indicates the output Vm, and the thick solid line nu indicates the output Vcom of the command means 30 by the second command operation. Variable resistor 17
Is good, the operating voltage Vp changes in accordance with the amount of depression of the pedal 11, and Vp is Vpmin
In the following, when the contact failure detecting means 23 detects a contact failure, the output Vm of the storage means 24 becomes a constant voltage as indicated by ヲ. Vp1 is the operating voltage at the time of recovery from the contact failure at point e, Vm1 is the voltage stored in the storage means 24 at the time of detection of the contact failure, and dV1 is the difference between Vp1 and Vm1. The second operation of the command means 30 is as follows.
Becomes larger than Vpmin, and Vp1 is not output as the command voltage Vcom immediately after the return from the poor contact.
As shown in the null part of Vcom, the following operation result is converted to the command voltage V
com is output.

When Ve = dV1−δv × δt> = 0, Vcom = Vm−Ve is output, and when Ve = dV1−δv × δt0, Vcom = Vm is output.

However, Ve: Vm: Correction voltage δv: Decrease rate of dV1 δt: Elapsed time since recovery from poor contact A third command operation of the command means 30 will be described with reference to FIG. In the above-described second command operation, when the poor contact is restored at the point E or the point E ′, Vcom is gradually changed to be equal to Vm as shown by the thick solid line nu in FIG. The third command operation is to return dV1 while Vm is increasing or decreasing, as indicated by the thick solid line Vcom, when returning from poor contact at point E or point E 'in FIG.
To maintain. Then, at the time when the voltage changes from increase to decrease or from decrease to increase as in the case of Y, the command voltage Vcom at that time is kept constant. Also, Vm decreases and Vcom
After Vm becomes equal to Vm, Vcom outputs Vm.

The fourth operation of the command means 30 will be described with reference to FIG. In FIG. 11, similarly to FIG. 9, the two-dot chain line indicates the depression amount of the pedal 11, the solid line indicates the operating voltage Vp,
The dotted line indicates the output Vm of the storage means 24, and the thick solid line indicates the fourth
5 shows the output voltage Vcom of the command means 30 by the command operation of FIG. When the contact of the variable resistor 17 is good, the operating voltage Vp
Changes according to the amount of depression of the pedal 11, and V
When p becomes equal to or less than Vpmin and the contact failure detecting unit 23 detects a contact failure, the output Vm of the storage unit 24 becomes a constant voltage Vm1 as shown by ヲ. The fourth operation is that when the operator steps on the pedal 11 and keeps the motor speed constant,
This is the operation in the case where there is a poor contact. The command means 30 detects a contact failure at the point H and, if the state is maintained for t1 time, gradually reduces Vcom as indicated by the thick solid line. Further, after the elapse of the time t2, the worker is sensuously maintaining the constant speed, so that an intention to increase the speed is activated and the pedal depression amount increases. Then, it recovers from the poor contact by the dot. In the embodiment, the command voltage Vcom upon returning is set equal to Vm1.

Incidentally, the first to fourth command means are provided in FIG.
When the contact failure detection signal FC is input in the vicinity of the stepping voltage v4 shown in (3), the neutral voltage v3 is output regardless of the first to fourth operations.

The voltage change rate may be detected by any means such as a differential circuit using C and R or a differential method using software in a microcomputer.

(Embodiment 3) FIG. 12 is a block diagram of a sewing machine driving device according to a third embodiment, and FIG. 13 is a graph for explaining the operation thereof.

The configuration of the third embodiment is different from that of the first embodiment in that the control device 31 has a warning means 32 and the operation of the command means 33 is different. The warning means 32 monitors the operation voltage Vp, receives a contact failure detection signal FC from the contact failure detection means 23, performs a warning operation, and outputs a warning signal AL to the command means 33.

The operation of the third embodiment configured as described above will be described below. The only operation different from that of the first embodiment is the operation of the warning means 32 and the operation of the command means 33 when the output AL of the warning means 32 is input. The warning means 32 of the third embodiment stores the Vp voltage immediately before the FC signal is turned on and immediately after the FC signal is turned off as the missing voltage Vf. Then, a plurality of operations can be performed as a warning operation. The first operation of the warning means 32 is fc1 in FIG.
When five or more contact failure points occur as in fc5, it is determined that smooth operation cannot be ensured, and a warning is issued. In the embodiment, when the pedal sensor 9 is operated from the maximum stepping down to the maximum stepping back, when five or more contact failure points are detected, a warning is sounded by a buzzer and a console for displaying and setting or switching the sewing machine operation (not shown). A warning signal is output to the user and the contents of the warning are displayed in characters or symbols.

The second operation of the warning means 32 is to add up the missing voltage Vf so that the accumulation of the width of the sliding surface with poor contact in the sliding range of the variable resistor 17 can be used to determine the operable sliding range. When it is determined that the value has reached 10%, or when it is determined that the width of the sliding surface of any one of the contact failures has reached 5% of the operable sliding range, the same operation as in the first operation is performed. Issues a warning.

The third operation of the warning means 32 is in the range indicated by S in FIG. 13, that is, the second return voltage, which is the automatic thread trimming start position: v1, and the first return voltage, which is the cloth press-up operation position: v2. Neutral voltage v3, which is the neutral position of the pedal,
When a contact failure occurs in a region including the stepping voltage: v4 voltage, which is the drive stop position of the motor 5, a warning similar to the first operation is issued.

The fourth operation of the warning means 32 is shown in FIG.
When a contact failure occurs within a range of ± 0.1 V with respect to each of the voltages 1, v2, v3, and v4, a warning similar to that in the first operation is issued.

The fifth operation of the warning means 32 is as follows.
3 is to output a warning signal AL relating to the operation of 3.
At the same time as issuing a warning in the first to fourth operations, the warning means 32 outputs a warning signal AL. Command means 3
3 switches the output of the command voltage Vcom with respect to the operation voltage Vp when the AL signal is input. That is, in FIG. 13, when the contact is good, the command means 33 indicates that the operating voltage Vp is v4
When the voltage is at the voltage, the driving is stopped, and the driving means 19 is instructed to perform the variable speed control within the range of the voltage v4 from the point V. , A command voltage Vcom for decelerating to a stop at a point n is instructed to the driving means 19.

The operation of the command means 33 when there is no AL signal may be the operation of the command means 30 described in the second embodiment. In the fourth operation of the warning means 32, v1, v
The range of ± 0.1 V is set for each of the voltages v2, v3, and v4, but other values may be used. Further, although the contact failure area of the variable resistor 17 is determined by the missing voltage Vf in the second operation of the warning means, the determination may be made by accumulating the time during which the contact failure detection signal FC is output. Further, the warning may be in other ways.

(Embodiment 4) FIG. 14 is a block diagram of a sewing machine driving apparatus according to a fourth embodiment. The configuration of the fourth embodiment is different from that of the third embodiment in that a warning device 35 is provided in the control device 34 and the input of the warning device 35 is a voltage Vp from the pedal sensor 9. The operation of the command means 36 is different.

The operation of the fourth embodiment configured as described above will be described below. The operation of the sewing machine driving apparatus according to the fourth embodiment is the same as that of the sewing machine driving apparatus according to the above-described third embodiment except for the operation related to the warning unit 35.

The warning means 35 of the fourth embodiment also performs a plurality of operations. The first operation of the warning means 35 is to monitor the operation voltage Vp, count the change in which the voltage Vp increases and decreases as one time,
When the total number of times from the start of use exceeds a specified number of times, in this embodiment, 7 million times, a warning similar to the first operation of the warning means 32 of the third embodiment is issued.

The second operation of the warning means 35 operates as a vibration detecting means according to claims 16 and 17 of the present invention. In the second operation, the operation voltage Vp is monitored, and when an abnormal voltage change of 0.2 V or more from 3 Hz to 100 Hz continues for 2 seconds or more, a pilot lamp (not shown) of the control device 34 blinks.

The third operation of the warning means 35 is based on the second operation described above.
And the command voltage Vcom of the command means 36 is gradually reduced until the abnormal voltage change disappears.

In the second operation, the abnormal voltage change when the voltage is continuously from 3 Hz to 100 Hz at 0.2 V or more for 2 seconds or more is defined as an abnormal voltage change. Also, the warning may be another method.

(Embodiment 5) FIG. 15 is a block diagram of a sewing machine driving device according to a fifth embodiment, and FIG. 16 is a structural diagram of a pedal sensor 37. The configuration of the fifth embodiment is different from that of the above-described conventional example in that a warning device 40 is provided in the control device 38. In FIG. 15, the operation voltage Vp of the pedal sensor 37 is input to the command means 39 and the warning means 40. The output Vcom of the command means 39 is input to the drive means 19 and the control means 20. In FIG. 16, the pedal sensor 37 according to the fifth embodiment is the same as the conventional pedal sensor 9 described above.
And the variable resistor 42 and the lever B43 are different. The variable resistor 42 has a shaft B44 having a square cross section, and the lever B43 has a hole 45 to be fitted with the shaft B44. further,
The width of the groove of the lever B43 is made larger than the outer diameter of the pin A14.

The operation of the fifth embodiment configured as described above will be described below. In FIG. 16A, the movement of the lever A12 is the movement of the arrow A at the portion of the pin A14, and the rotation of the arrow B is about the axis B44. FIG.
In (b), the rotation of the arrow is adjusted to the axis B4 of the variable resistor 42.
4 and the slider 46 integral with the shaft B44.
, The slider 46 slides on the surface of the resistor 47.
The resistance of the normal variable resistor has an angle of 270 to 300 degrees with respect to the axis B44 as shown in FIG. 16 (b) full rotation angle.
Only 0 degrees are used. Thus, when the shaft B44 is inserted into the lever B43 so that the arrow C of the shaft B44 faces downward as shown in FIG. 16C, the slider 46 moves within the range of the area e in FIG. When the arrow U points to the left as shown in the figure, it moves in the range of the area C, and when the arrow U points to the right, it moves in the area of the area Y. Accordingly, a change in the operating voltage Vp is obtained from 2 V to 3 V in the range of the region E, from 3.5 V to 4.5 V in the range of the region V, and from 0.5 V to 1.5 V in the range of the region Y.

The groove width Wb of the lever B43 is
4, the gap G = W.
b-dA is formed. When the control device 38 vibrates due to the vibration of the sewing machine, the pedal 11 is fixed by the operator.
It looks as if the lever A12 is vibrating. Here, even if the pin A14 fixed to the lever A12 vibrates, the vibration below the gap G is not transmitted to the lever B43, so that the slider 46 of the variable resistor 42 does not vibrate.

The operation of the control device 38 is different from the operation of the sewing machine driving device in the above-mentioned conventional example, the operation of the command means 39, and the operation of the warning means 40. The operation of the command means 39 is shown in FIG.
As shown in the figure, in each of the sliding areas of the variable resistor 42, the voltage area of オ, 、, and ク, the stepping back 2 detection position,
It is possible to instruct a return first detection position, a neutral position, a depressed position, and a variable speed range.

The operation of the warning means 40 monitors the operation voltage Vp and issues a warning by a buzzer sound when a change in Vp across the sliding areas is detected.

Although the cross section of the shaft B and the shape of the hole corresponding to the lever B are square in the embodiment, the shape may be a rectangle, a regular polygon or an ellipse. In that case, the sliding surface of the variable resistor may be used. The number of divisions differs from the number of area divisions of the command means.

In the embodiment, the divided region is selected in correspondence with the cross section of the shaft B and the lever B. However, the divided region may be selected depending on the mounting direction of the variable resistor.

Further, the warning of the warning means 40 may be performed by another method. (Embodiment 6) FIG. 18 is a block diagram of a sewing machine driving device according to a sixth embodiment.

The configuration of the sixth embodiment is different from the fifth embodiment in that the control device 48 has an amplifying means 49, a bias means 50 and a switching means 51. Further, the operations of the warning unit 52 and the instruction unit 53 are different. Variable resistor 37
The operation voltage Vp is input to the amplifying means 49 and the bias means 50, and the output Vpa of the amplifying means 49 is input to the command means 52. The output Vb of the bias means 50 is
, And the switching unit 51 is connected to the bias unit 50.

The variable resistor 42 of the pedal sensor 37 in the fifth embodiment can select three regions, namely, region A, region E, and region C. The change range of the operation voltage Vp differs depending on the selected region. That is, the voltage is 0.5 to 1.5 V in the region Y, 2 to 3 V in the region E, and 3.5 to 4.5 V in the region K. The amplifying means 49 operates so that the output Vpa varies from 0 to 5 V regardless of which of the three regions is selected. That is, the input voltage Vp and the bias voltage Vb are output by performing the following calculation.

Vpa = (Vp−Vb) × 5 Therefore, in order to change Vpa from 0 to 5 V, Vp = 0.5 V to 1.5 V, Vb = 0.5 V in region Y, and Vp = 2 in region E Vb = 2.0 from 0.0V to 3.0V
V, Vb = 3.5V-4.5V in the area
3.5V. That is, the axis B44 of the pedal sensor 37
When region Y, region O, or region H is selected by the combination of and lever L43, the bias voltage Vb may be set to 0.5 V, 2.0 V, or 3.5 V in accordance with the region. The switching means 51 can set a bias voltage. The operation of the warning means 52 issues a warning by a buzzer sound when the aforementioned Vp voltage region and the bias voltage do not match. The command means 53 sets the input dynamic range at the time of the maximum return of the pedal 11 and the maximum depression to 0.5 V to 4.5 V.

In the sixth embodiment, the bias voltage can be automatically switched. The biasing means 50 includes a second
When the power is turned on to the control device 48 in a state where the pedal is normally in the neutral position, Vp becomes 0.5 V to 1.5 V.
In the case of V, Vb = 0.5 V, Vp is 2.0 V to 3.0 V
In this case, Vb = 2.0 V is output, and when Vp is between 3.5 V and 4.5 V, Vb = 3.5 V is output.

(Embodiment 7) FIG. 19 is a block diagram of a sewing machine driving device according to a seventh embodiment. In the configuration of the seventh embodiment, a storage device P55, an operating voltage recognizing device 56 and a warning device 57 are provided in the sewing machine driving device and the control device 54 in the above-mentioned conventional example, and the operation of the commanding device 58 is different. The storage means P55 receives the operation voltage Vp, the operating voltage recognition means 56 monitors the data stored in the storage means P55, and outputs its output to the command means 58, the display means 27 and the warning means 57.
To communicate.

The operation of the seventh embodiment will be described below. The operation of the sewing machine driving device in the seventh embodiment is the same as the sewing machine operation in the conventional example except for the operation related to the operating voltage recognition means 56. As described in the conventional example, the operation voltage Vp by the operation of the operator is constantly changing during the operation. However, since the operator operates with purpose, v1,
The time during which specific voltages such as v2, v3, and v7 are output becomes longer. The storage unit P55 monitors Vp, and stores the voltage and the accumulated time while accumulating the duration for each Vp voltage that lasts 0.5 seconds or more. Further, the storage means P5
5 sequentially deletes old data when the storage amount reaches a certain amount. The operating voltage recognizing means 56 monitors the data stored in the storing means 55 and determines the voltage having the longest accumulated time as the neutral voltage v3.
Recognize. The recognized neutral voltage v3 is stored every 500 hours of energization time from the start of use. When a deviation of V3 from the start of use by 0.2 V or more occurs, the display means 27 blinks a pilot lamp (not shown) of the control device 48. Furthermore, V3 and 0.
When a deviation of 4 V or more occurs, a warning is issued by a buzzer sound or the like.

The command means 58 receives the V3 data from the operating voltage recognition means 56, corrects the neutral position detection voltage,
The correction is applied to other pedal position detection voltages, and the command voltage Vcom is output.

(Embodiment 8) FIG. 20 is a block diagram of a sewing machine driving apparatus according to an eighth embodiment.
Is a time chart for explaining the operation. The configuration of the eighth embodiment is different from the conventional example in that the sewing machine driving device and the control device 59 are provided with the display means 27 and the change rate detecting means 29, and the operation of the command means 60 is different. The operation command Vp from the pedal sensor 9 is input to the change rate detecting means 29 and the command means 60, and the output Dv of the change rate detecting means 29 is input to the command means 60 and input to the FC display means 27. The output of the command means 60 is output from the driving means 19 and the control means 20.
Is input to Other configurations are the same as the conventional example.

The operation of the sewing machine driving apparatus according to the eighth embodiment will be described below with reference to FIGS. In FIG. 21, the solid line is the operating voltage Vp, and the thick solid line is the command voltage Vcom and D
v represents the rate of change of the operation voltage Vp. Change rate detecting means 29
Measures the rate of change of the operating voltage Vp and outputs it as a Dv signal. The command means 60 according to the eighth embodiment has an operation voltage Vp
, And can change its integration constant. When DV is less than ± 0.5 V / ms, Vp
Vcom with a small time constant of 0.5 V / ms or less
Is output, and when DV is ± 0.5 V / ms or more, Vcom has a large time constant of 0.01 V / ms or more with respect to Vp.
Is output. In FIG. 22, the conversion rate detecting means 29 determines that the DV is −
When the speed is 0.5 V / ms or less, it is determined that the contact failure has started, and the contact failure detection signal FC = 1 is output. And DV is +
If it is 0.5 V / ms or more, it is determined that the connection has recovered from the contact failure, and the contact failure detection signal FC = 0 is output. Display means 2
7 flashes a pilot lamp (not shown) of the control device 59 when FC = 1.

The time constant of the command means in the eighth embodiment is an example, and may be another value.

[0097]

As described above, claim 1 of the present invention is described below.
ADVANTAGE OF THE INVENTION According to the invention of the description, there is an effect that it is possible to know the replacement time of the variable resistor by displaying the contact failure on the variable resistor.

According to the second aspect of the present invention, the command voltage does not change abnormally even when the variable resistor has a poor contact, so that there is an advantageous effect that the use can be continued.

According to the third aspect of the present invention, even if a contact failure of the variable resistor progresses and a relatively large operating voltage is lost, the missing voltage is estimated and output.
There is an advantageous effect that an abnormal change in the command voltage can be suppressed and the use can be continued for a relatively long time even if the contact failure progresses.

According to the fourth aspect of the present invention, even if the contact failure of the variable resistor progresses and a relatively large operation voltage is lost, the command voltage is gradually reduced when returning from the contact failure state. Since the operation voltage is returned to a lower level, there is an advantageous effect that the operation can be continued for a relatively long time even if a contact failure occurs, while maintaining a smoother instruction for the sewing machine operation.

According to the fifth aspect of the present invention, even if the contact failure of the variable resistor progresses and a relatively large operating voltage is lost, the command voltage is controlled by the hysteresis characteristic from the contact failure state. Since the operation is restored to the voltage, there is an advantageous effect that the operation can be continued for a relatively long time even if a contact failure occurs, while maintaining a smooth operation of the sewing machine operation without a sense of incongruity for the operator.

According to the invention as set forth in claim 6, the effect of delaying the progress of the contact failure is that the command voltage changes and comes off the contact failure part during continuous use at the contact failure part. There is.

According to the seventh aspect of the present invention, there is an effect that it is possible to grasp the progress of the contact failure and to know the replacement time of the variable resistor.

According to the invention as set forth in claim 8, it is possible to determine whether the contact failure is within the variable speed range or the contact failure within the range related to the sewing machine operation of the variable resistor. If it is within the range, it is effective to determine that it is time to replace the variable resistor if it is within the range related to the sewing machine operation.

According to the ninth aspect of the present invention, the occurrence of a contact failure is warned based on the threshold value related to the sewing operation of the variable resistor, and the remaining resistor can be used continuously. Even if it occurs, the use can be continued for a relatively long period, and there is an effect that the variable resistor can be replaced when there is a possibility that a serious trouble may occur in the sewing machine operation.

According to the tenth aspect of the present invention, the progress of the defective contact portion of the variable resistor can be accurately grasped by the accumulation of the missing voltage, and the timing of replacement can be accurately known.

According to the eleventh aspect of the present invention, when the variable speed setting device is no longer sufficient as the variable speed setting device due to the progress of the contact failure portion of the variable resistor, it is temporarily turned on until it is replaced. There is an effect that can be used as / off control.

According to the twelfth aspect of the present invention, since the number of times of sliding of the variable resistor is estimated from the number of times of voltage change, there is an effect that the life is accurately predicted and the replacement time is known.

According to the thirteenth aspect of the present invention, when contact failure occurs in the variable range of the variable resistor, the operation range is switched to an unused sliding surface, and a new sliding surface is used. Use has the advantageous effect that the same variable resistor can be used for twice or more times.

According to the invention as set forth in claim 14, when contact failure occurs in the variable range of the variable resistor, an unused sliding surface is newly used, and a small change in resistance is obtained. However, there is an effect that a large voltage change can be secured and a smooth shift can be performed.

According to the invention as set forth in claim 15, when contact failure occurs in the variable range of the variable resistor, an unused sliding surface is newly used and the operating voltage range is changed. However, since it is automatically adjusted to the command input range, it can be used only by changing the sliding surface on the variable resistor side.

The sixteenth aspect of the present invention is the sixteenth aspect of the present invention.
According to the invention, since the display is made when the slider of the variable resistor vibrates minutely, there is an effect of preventing abnormal wear due to the minute vibration.

According to the invention of claim 17, when the slider of the variable resistor vibrates minutely, the speed is automatically shifted and the resonance point is removed, so that abnormal wear due to the minute vibration is prevented. effective.

According to the invention as set forth in claim 18, since micro vibration applied to the lever of the speed setting device is not transmitted to the variable resistor, there is an effect of preventing abnormal wear due to micro vibration.

According to the invention as set forth in claim 19, when the change of the operation voltage is abnormally large, it is determined that the contact is poor, and the time constant for converting the operation voltage into the command voltage is increased. With this configuration, it is possible to suppress a change in speed at the time of poor contact, and it is possible to continue use even if a poor contact occurs.

According to the twentieth aspect of the present invention, the operation voltage when the pedal is neutral can be observed without special measurement, and there is an effect that the deviation in the mechanism can be known.

According to the twenty-first aspect of the present invention, the operating voltage when the pedal is in the neutral state can be observed without special measurement, and the deviation in the mechanism can be known, and the correction is automatically performed. Therefore, there is an effect that it can be used without re-adjustment for a long time.

[Brief description of the drawings]

FIG. 1 is a block diagram according to a first embodiment of the present invention.

FIG. 2 is a general arrangement diagram of a sewing machine and a sewing machine driving device;

FIG. 3 is a circuit diagram of a contact failure detection circuit according to the first embodiment of the present invention.

FIG. 4 is a circuit diagram of a contact failure detection circuit according to the first embodiment of the present invention.

FIG. 5 is a flowchart of an operation according to the first embodiment of the present invention.

FIG. 6 is a graph of an operation in the first embodiment of the present invention.

FIG. 7 is a block diagram according to a second embodiment of the present invention.

FIG. 8 is a time chart of the operation in the second embodiment of the present invention.

FIG. 9 is a time chart of the operation in the second embodiment of the present invention.

FIG. 10 is a time chart of the operation in the second embodiment of the present invention.

FIG. 11 is a time chart of an operation in the second embodiment of the present invention.

FIG. 12 is a block diagram according to a third embodiment of the present invention.

FIG. 13 is a graph of an operation according to the third embodiment of the present invention.

FIG. 14 is a block diagram according to a fourth embodiment of the present invention.

FIG. 15 is a block diagram according to a fifth embodiment of the present invention.

FIG. 16 is a structural diagram of a speed setting device according to a fifth embodiment of the present invention.

FIG. 17 is a graph in Example 5 of the present invention.

FIG. 18 is a block diagram according to a sixth embodiment of the present invention.

FIG. 19 is a block diagram according to a seventh embodiment of the present invention.

FIG. 20 is a block diagram according to an eighth embodiment of the present invention.

FIG. 21 is a time chart of the operation in the eighth embodiment of the present invention.

FIG. 22 is a time chart of the operation in the eighth embodiment of the present invention.

FIG. 23 is a block diagram in a conventional example.

FIG. 24 is a structural diagram of a speed setting device in a conventional example.

FIG. 25 is a graph of an operation in a conventional example.

FIG. 26 is a graph of an operation in a conventional example.

FIG. 27 is a graph of an operation in a conventional example.

Claims (33)

[Claims] 1. A control device for controlling a sewing machine operation and a motor for driving a sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop, wherein the speed setting device is provided with an operation signal corresponding to an operation of an operator. Equipped with a variable resistor that outputs
A sewing machine driving device having a configuration in which the control device includes a contact failure detection unit and a display unit, and the contact failure detection unit monitors the operation signal and displays the operation signal on the display unit when the variable resistor has a contact failure. 2. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop, wherein the speed setting device has an operation signal corresponding to an operation of an operator. Equipped with a variable resistor that outputs
The control device includes a contact failure detection unit and a storage unit, and the contact failure detection unit monitors the operation signal, and updates the operation signal to the storage unit when the contact of the variable resistor is good. A sewing machine driving device configured to operate so as to store the sewing machine while the signal stored in the control device controls a sewing machine operation and a sewing machine driving motor. 3. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop, wherein the speed setting device has an operation signal corresponding to an operation of an operator. Equipped with a variable resistor that outputs
The control device includes a contact failure detection unit, a voltage change rate detection unit, a storage unit, and a first command unit. The contact failure detection unit monitors the operation signal and detects when the variable resistor has a contact failure. A contact failure detection signal is output, and when the contact of the variable resistor is good, the storage means operates to store the operation signal while updating it, and the voltage change rate detection means detects the operation signal voltage. Detecting the rate of change, the first command means, when the contact failure detection signal is output, outputs a command voltage calculated to change at the rate of change based on a signal from the storage means; A sewing machine driving device configured to control a sewing machine operation and a motor that drives the sewing machine using a signal from the storage unit as a command voltage when there is no contact failure detection signal. 4. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop, wherein the speed setting device has an operation signal corresponding to an operation of an operator. Equipped with a variable resistor that outputs
The control device includes a contact failure detection unit, a storage unit,
Command means, the contact failure detecting means monitors the operation signal, turns on the contact failure detection signal when the variable resistor is in contact failure, and when the contact of the variable resistor is good, The second command means serves to store the operation signal in the storage means while updating it, and when the contact failure detection signal changes from on to off, the immediately preceding command voltage and the signal from the storage means are used. A command voltage that decreases with time, and outputs a signal from the storage means as a command voltage in other states to control the sewing machine operation and the sewing machine driving motor. apparatus. 5. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop, wherein the speed setting device has an operation signal corresponding to an operation of an operator. Equipped with a variable resistor that outputs
The control device includes: a contact failure detection unit; a storage unit;
Command means, the contact failure detecting means monitors the operation signal, turns on the contact failure detection signal when the variable resistor is in contact failure, and when the contact of the variable resistor is good, The third instruction means operates to store the operation signal while updating the operation signal in the storage means. When the contact failure detection signal is turned off and on, the third command means outputs the operation signal from the storage means. The signal is output as a command voltage for controlling the sewing machine operation and the sewing machine driving motor, and when the contact failure detection signal changes from ON to OFF, the command voltage is the signal from the storage means and the immediately preceding command voltage. And the error persists during the increase or decrease of the signal from the storage means, and when the signal from the increase to the decrease or from the decrease to the increase, the command voltage is maintained. Signal and sewing machine drive apparatus configured to sustain until it matches from the storage means. 6. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop, wherein the speed setting device is provided with an operation signal corresponding to an operation of an operator. Equipped with a variable resistor that outputs
The control device includes a contact failure detection unit, a storage unit, and a fourth command unit, and the contact failure detection unit monitors the operation signal and outputs a contact failure detection signal when the variable resistor has a contact failure, When the contact of the variable resistor is good, the storage means operates to store the operation signal while updating the operation signal, and the fourth command means receives a signal from the storage means and performs a sewing operation and a sewing machine drive. A sewing machine drive device configured to output as a command voltage for controlling a motor for use, and to increase or decrease the command voltage when the contact failure detection signal continues for a predetermined time or more. 7. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal corresponding to the first and second control signals, and the control device includes a contact failure detection unit and a first resistor.
Warning means, the contact failure detection means monitors the operation signal, and when the variable resistor loses the operation signal due to contact failure, sends a contact failure detection signal to the first warning means, (1) A sewing machine drive device configured to monitor the operation signal and issue a warning when the number of defective contact portions of the variable resistor becomes equal to or greater than a predetermined number. 8. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for instructing the sewing machine operation and drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal according to the control signal.
Warning means, the contact failure detection means monitors the operation signal, and when the variable resistor loses the operation signal due to the contact failure, sends a contact failure detection signal to the second warning means, The second warning device monitors the operation signal and issues a warning when a contact failure of the variable resistor occurs in a specific area related to the sewing machine operation. 9. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal according to the control signal.
Warning means, the contact failure detecting means monitors the operation signal, and sends a contact failure detection signal to the third warning means when the variable resistor loses the operation signal due to contact failure, and 3. A sewing machine driving device according to claim 3, wherein the warning means monitors the operation signal and issues a warning when the defective contact portion of the variable resistor includes a specific operation signal relating to a threshold value of the sewing operation. 10. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal according to the control device, the control device includes a contact failure detection unit and a fourth warning unit, the contact failure detection unit monitors the operation signal, and the variable resistor When the operation signal is lost due to a contact failure, a contact failure detection signal is sent to the fourth warning means, and the fourth warning means monitors the operation signal, and the operation signal is lost due to the contact failure of the variable resistor. A sewing machine driving device configured to issue a warning when the total voltage exceeds a predetermined value. 11. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal according to the following. The control device includes a contact failure detection unit, a warning unit, and a fifth command unit. The contact failure detection unit monitors the operation signal, When the operation signal is lost due to a contact failure of the resistor, a contact failure detection signal is sent to the warning unit, and the warning unit monitors the operation signal, and the number of contact failure portions of the variable resistor is equal to or more than a predetermined number. A warning is issued when the warning signal becomes true, and the fifth command means outputs the operation signal by the warning as a command voltage for only a constant speed operation at a predetermined speed and a stop to control a sewing machine driving motor. Drive. 12. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal according to the following. The control device includes a fifth warning unit, and the fifth warning unit monitors the operation signal, and determines the number of changes in the operation signal increase / decrease. A sewing machine driving device configured to count and issue a warning when a predetermined number of times is exceeded. 13. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device. Means and a sixth warning means,
The speed setting device includes a variable resistor that outputs an operation signal according to an operation of an operator and an area selection unit, and a variable range of the variable resistor is an integral multiple of the operation range of the operator, and the area selection unit. Can select which part of the variable range is used for the operation range, and the sixth command means switches the operation input range in accordance with an operation signal corresponding to the selected operation range, and performs a sewing operation and a motor for driving the sewing machine. Can be controlled, the sixth warning means monitors the operation signal,
A sewing machine driving device configured to issue a warning when an operation signal is out of the operation input range. 14. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the control device has a first level. The speed setting device has a switching device, an amplification device, and a seventh command device, the speed setting device includes a variable resistor that outputs an operation signal according to an operation of an operator, and a region selection device, and a variable range of the variable resistor is The area selection means can select which part of the variable range the operation range uses, and the first level switching means corresponds to the selected operation range. The operating signal to be added is added or subtracted by a constant voltage so as to fall within the input range of the amplifying means. The amplifying means amplifies the signal from the level switching means to the input range of the seventh command means. Seventh instruction means is a sewing machine drive apparatus having a configuration for controlling a motor for sewing operation and the sewing machine drive in the control device. 15. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the control device has a second level. The speed setting device has a switching resistor, a seventh warning device, and a seventh commanding device. The speed setting device includes a variable resistor that outputs an operation signal according to an operation of an operator and a region selection device. The range is an integral multiple of the operator's operation range, and the area selecting means can select which part of the variable range the operation range uses.
Warning means monitors the operation signal, and issues a warning when the operation signal is out of the command input range of the seventh command means,
The second level switching means corrects the operation signal within the command input range of the seventh command means when the warning is issued, and the seventh command means is provided for the second level switching means. A sewing machine driving device configured to control a sewing machine operation and a sewing machine driving motor by receiving an output. 16. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. The control device has a vibration detecting means and a display means, and the vibration detecting means monitors the operation signal, and a voltage change of a predetermined frequency or more is continuously generated. A sewing machine driving device configured to display by the display means when the error occurs. 17. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor that outputs an operation signal according to the control signal. The control device includes a vibration detection unit, a display unit, and an eighth command unit. The vibration detection unit monitors the operation signal, When the voltage change of the above occurs continuously, it is indicated by the display means,
Sewing machine drive device configured to increase or decrease the motor speed by the command means. 18. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for outputting an operation signal for commanding the sewing machine operation and the drive stop to the control device, wherein the speed setting device is operated by an operator. A variable resistor for outputting an operation signal according to the above, and an operation lever, wherein the variable resistor and the operation lever are connected by a structure having an air gap. 19. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop. A variable resistor for outputting a voltage change rate, the control device includes voltage change rate detection means, and ninth command means, and the voltage change rate detection means detects a change rate of the operation signal voltage, and ninth command means Outputs the operation signal as a command signal with a relatively small time constant when the change rate is equal to or less than a predetermined value, and outputs the operation signal with a relatively large time constant when the change rate is equal to or more than a predetermined value. Output as
A sewing machine driving device configured to control the sewing machine operation and the sewing machine driving motor in the control device; 20. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop. The control device includes an operating voltage recognizing means and an eighth warning means, the operating voltage recognizing means monitors the operation signal, and when the operation signal continuously outputs a constant value for a predetermined time or more, The value and the time are stored for a predetermined number of times or more, and the value for which the accumulated time is longest and has reached the specified time or more is recognized as a neutral signal which is an operation signal when the operator does not operate anything, and A warning means for issuing a warning when the neutral signal changes by a certain amount or more as compared with the neutral signal at a specific time. 21. A control device for controlling a sewing machine operation and a motor for driving the sewing machine, and a speed setting device for instructing the control device to perform a sewing operation and a drive stop. The control device includes an operating voltage recognizing unit and a command correcting unit. The operating voltage recognizing unit monitors the operation signal, and when the operation signal outputs a constant value for a predetermined time or more, the value of the operation signal is monitored. And the time is stored for a predetermined number of times or more, and the value in which the accumulated time is long and reaches the specified time or more is recognized as a neutral signal which is an operation signal when the operator does not operate anything, and the command correction means A sewing machine driving device configured to correct a voltage for commanding a sewing machine operation and a sewing machine driving motor in the control device in accordance with a change in the neutral signal. 22. The sewing machine driving apparatus according to claim 2, wherein the storage means outputs a stop command when a poor contact detection signal is input near an operation voltage related to the stop of driving of the motor. 23. A structure according to claim 3, wherein said first to fourth command means outputs a stop command when a contact failure detection signal is input near an operation voltage related to a motor drive stop.
The sewing machine driving device according to any one of claims 5 and 6. 24. A system according to claim 10, wherein said fourth warning means monitors an operation signal and issues a warning when a voltage drop of said operation signal due to a contact failure point of any one of said variable resistors exceeds a predetermined value. A sewing machine driving device as described in the above. 25. The sewing machine driving apparatus according to claim 10, wherein the fourth warning means monitors the operation signal and estimates a missing voltage based on a time at which the operation signal was lost due to poor contact. 26. The sewing machine driving device according to claim 11, wherein the warning means issues a warning when a contact failure of the variable resistor occurs in a specific area related to the sewing operation of the operation signal. 27. The sewing machine driving device according to claim 11, wherein the warning means issues a warning when the contact failure portion of the variable resistor includes a specific operation signal related to a threshold value of the sewing machine operation. 28. The sewing machine driving apparatus according to claim 11, wherein the warning means issues a warning when the sum of the widths of the defective contact portions of the variable resistor exceeds a predetermined value. 29. An operation signal input of the contact failure detecting means is connected by a resistor and a potential outside the voltage change range of the variable resistor, and the contact failure detection means monitors the operation signal and monitors the potential outside the voltage change range. The sewing machine driving device according to any one of claims 1 to 11, wherein the variable resistor is recognized as a contact failure when the detection is made. 30. The control means has two positive and negative power supplies, and the variable resistor is connected to one of the positive and negative power supplies. The operation signal input of the contact failure detecting means is connected to a power supply having a polarity opposite to that of the variable resistor. Wherein the contact failure detecting means monitors the operation signal and recognizes the variable resistor as a contact failure when detecting a potential having a polarity opposite to that of the variable resistor side power supply. The sewing machine driving device according to any one of claims 11 to 11. 31. A contact failure detecting means monitors an operation signal,
12. The sewing machine driving apparatus according to claim 1, wherein when the voltage change is larger than a predetermined value, the variable resistor recognizes occurrence of a contact failure or recovery from the contact failure. 32. The axis of the variable resistor has a rectangular or regular polygonal cross section, and the area selecting means has a structure in which a structure transmitting an operation of an operator to the axis fits into the cross section of the axis. The sewing machine driving device according to any one of claims 13, 14, and 15. 33. The apparatus according to claim 13, wherein said area selecting means has a structure in which said speed setting device and said variable resistor can be mounted even when they are rotated at a fixed angle about an axis.
The sewing machine drive device according to any one of claims 4 and 15.