JPH09253373A - Sewing speed controller for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily control the sewing speed of a sewing machine by arranging a plate-like pressure sensitive variable resistor provided with electrode plates on upper and lower parts and provided with pressure sensitive conductive rubber in the middle as a resistor for sewing machine motor speed control by the pressurization of a hand and a elbow around a throat plate on a sewing machine bed. SOLUTION: When a main switch 6 is operated, to be ON, a sewing machine motor driving part 15 drives a sewing machine motor 16. Also, a detected value from the plate-like pressure sensitive variable, resistor 12 is introduced through a voltage displacement detection part 17 or the like to the sewing machine motor driving part 15 and the rotation of the sewing machine motor 16 is controlled. For the pressure sensitive variable resistor 12, the pressure sensitive conductive rubber 19 is held by the electrode plates 20 and 21 from the upper and lower parts and the detected value is changed by the resistance change of the pressure sensitive conductive rubber 19 pressurized by the electrode plates 20 and 21. Thus, by pressurizing the pressure sensitive variable resistor 12 by an operator, signals corresponding to it are outputted and the sewing speed is controlled by the strength of the pressurizing force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing speed control device for a sewing machine.

[0002]

2. Description of the Related Art Conventionally, for sewing speed control and start / stop of a sewing machine, as shown in FIG. 5, a plate body 2 provided under a sewing machine base 1 is pushed by a knee to operate a speed control device for a sewing machine drive motor. Although it is done by controlling a foot-type resistor (not shown) placed on the floor, when doing such work as a long-term work, the feeling of fatigue of the knees and feet is strong and There are requests. In the figure, reference numeral 3 is a sewing machine head, and 4 is a sewing machine bed.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to control the running speed of the sewing cloth of the sewing machine without causing the above-mentioned feeling of fatigue of the knees and feet. Alternatively, it is possible to obtain the desired sewing speed required by utilizing the strength of the pressing force of the one or both hands or the elbow on the sewing machine base against the surface of the sewing machine base.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems by being configured as follows. That is, (1) a plate-shaped pressure-sensitive variable resistor having upper and lower electrode plates and a pressure-sensitive conductive rubber in the middle is provided around the needle plate on the sewing machine bed, and the sewing machine motor speed by pressing the hand or elbow is used. Sewing speed control device for sewing machines arranged as a control resistor. (2) The pressure-sensitive variable resistor, which has upper and lower electrode plates and a pressure-sensitive conductive rubber in the middle, is formed in a U shape, and the sewing machine bed is opened along the left and right of the needle plate with the operator side open. Sewing speed control device of the sewing machine arranged above.

[0005]

1 is a schematic perspective view showing an embodiment of the present invention, FIG. 2 is a schematic control view showing the operation of a sewing speed control mechanism for sewing machines, and FIG. 3 is a pressure-sensitive variable resistor used in the present invention. FIG. 4 is an enlarged cross-sectional view showing the configuration of FIG. 4, and FIG. 4 is a view showing an example of the relationship setting between the pressing force of the sewing machine motor speed control resistor used in the present invention and the sewing machine speed.

As shown in FIG. 1, the sewing machine head 3 is provided with a sewing machine main switch 6, and the sewing machine needle 8 attached to the tip of the needle bar 7 is attached to the needle plate 10 of the sewing machine bed 9.
The sewing machine head 3 moves up and down in the needle hole 11 provided in the needle hole 11 to sew the cloth on the upper surface of the needle plate 10.

In the present invention, a plate-shaped pressure-sensitive variable resistor 12 as shown in FIG. 3 is arranged so as to surround the periphery of the needle plate 10. The plate-shaped pressure-sensitive variable resistor 12 is shown in FIG. It is connected to the control mechanism as shown. Although the embodiment shown in FIG. 1 is applied to a sewing machine that does not use a sewing machine base, the same applies to a case where the sewing machine head is attached to the sewing machine head 1 as shown in FIG. It is possible.

That is, the main switch 6 provided on the head of the sewing machine is connected to the power supply unit 1 via the power on / off control unit 13.
4, the sewing machine motor drive unit 15 applies a voltage to the sewing machine motor 16. At the same time, the detected value from the plate-shaped pressure-sensitive variable resistor 12 is introduced into the sewing machine motor drive unit 15 via the voltage displacement detection unit 17 and the motor drive control unit 18, and controls the rotation of the sewing machine motor 16.

As shown in a sectional view in FIG. 3, the plate-shaped pressure-sensitive variable resistor 12 is constructed by sandwiching upper and lower sides of a pressure-sensitive conductive rubber 19 with electrode plates 20 and 21. Since the detected value changes due to the resistance change of the pressure-sensitive conductive rubber 19 pressed by the pressure sensitive rubbers 21, 21, as shown in FIG. 1 and FIG. The pressure variable resistor 12 is configured so that it can be easily pressed by a hand or an elbow when an operator holds a cloth and performs sewing. In addition,
Upper and lower electrode plates 20, 21 and pressure-sensitive conductive rubber 19 between them
A conductive fiber cloth may be provided between and to improve the transmission of the detection signal from the electrode plate to the pressure-sensitive conductive rubber.

In order to control the sewing speed of the sewing machine when sewing the cloth, the hand or elbow of the worker who holds and guides the cloth to be sewn and guides it to the sewing machine sewing needle position is the sewing machine bed 9. Alternatively, the plate-shaped pressure-sensitive variable resistor 12 disposed on the sewing machine base is used, and the plate-shaped pressure-sensitive variable resistor 12 is pressed by the worker's hand or elbow. Output the corresponding signal,
According to the signal, the sewing speed is controlled by the structure shown in FIG.

The main switch 6 is provided on the sewing machine head 3 because the operator carelessly operates the plate-shaped pressure sensitive variable resistor 12
It is provided to prevent the danger of the sewing machine starting to move by touching and pressing it, and it may be provided at another position. Further, the plate-shaped pressure-sensitive variable resistor 12 arranged on the sewing machine bed 9 or the sewing machine table controls the sewing speed at high speed, low speed, and stop depending on the strength of the pressing force of the operator's hand or elbow at the time of sewing. Will be done.

FIG. 4 is a diagram showing an example of the relationship setting between the pressing force of the sewing machine motor speed control resistor and the sewing machine speed.
Depending on the operator's sensation between the sewing machine speed and the pressing force, the pressing area by the hand or elbow of the plate-shaped pressure-sensitive variable resistor 12 arranged on the operator's sewing machine bed surface and the change in strength can be arbitrarily selected. Its characteristics can be selected.

The plate-shaped pressure-sensitive variable resistor 12 may be mounted on the sewing machine bed surface or may be provided flush with the sewing machine bed surface. Also, sewing machine needle plate 1
The plate-shaped pressure-sensitive variable resistor 12 may be provided in a U shape in which the operator side is opened along the left and right of 0. This is because the front part of the needle plate on which the operator's hand or elbow is not placed during sewing is not pressed by the hand or elbow, so a plate-shaped pressure-sensitive variable resistor should be provided on this part. Is also meaningless. That is, the plate-shaped pressure-sensitive variable resistor may be provided at a position where the operator's hand or elbow may be placed on the sewing machine bed or the sewing machine table during sewing. That is, by using the dial 30 provided on the front surface of the sewing machine head 3, the characteristic of the sewing machine speed with respect to the pressing force shown in FIG. 4 can be arbitrarily set on the display 40 according to the operator's feeling.

[0014]

According to the present invention, when an operator holds a suture cloth and guides it to the position of the sewing needle of the sewing machine, the operator places his or her hand or elbow on the sewing machine bed around the needle plate. Since it comes to be located on the pressure-sensitive variable resistor 12, if the plate-shaped pressure-sensitive variable resistor 12 is pressed by an operator's hand or elbow, the sewing machine can be operated with almost no extra body movement. The sewing speed control can be performed, and the operator's fatigue can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic control diagram showing an operation of a sewing speed control mechanism for sewing machine.

FIG. 3 is an enlarged cross-sectional view showing the configuration of a pressure sensitive variable resistor used in the present invention.

FIG. 4 is a diagram showing an example of a relationship setting between a pressing force of a sewing machine motor speed control resistor and a sewing machine speed used in the present invention.

FIG. 5 is a perspective view showing an example of operating a conventional speed control device for a sewing machine drive motor.

[Explanation of symbols]

 3 Sewing machine head 6 Main switch 7 Needle bar 8 Sewing machine needle 9 Sewing machine bed 10 Needle plate 11 Needle hole 12 Plate-shaped pressure sensitive variable resistor

Claims (2)

[Claims] 1. A plate-shaped pressure-sensitive variable resistor having upper and lower electrode plates and a pressure-sensitive conductive rubber provided in the middle, a sewing machine motor speed by pressing a hand or elbow around a needle plate on a sewing machine bed. A sewing speed control device for a sewing machine, which is arranged as a control resistor. 2. A pressure-sensitive variable resistor having upper and lower electrode plates and a pressure-sensitive conductive rubber provided in the middle is formed in a U-shape so that the operator side is opened along the left and right sides of the needle plate. 2. The sewing speed control device for a sewing machine according to claim 1, wherein the sewing speed control device is arranged on a sewing machine bed.