JPH022307Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a foot pedal adjustment device, and more specifically, a sensor that can detect pressure is attached to the foot pedal of an industrial sewing machine, electronic musical instrument, etc. This relates to a foot control device that can arbitrarily control speed and volume depending on the amount and position of the foot.

[Prior art]

BACKGROUND ART Conventionally, the speed of a foot control device for an industrial sewing machine or the like has been adjusted by the amount of pedal depression or the pedal depression angle.

For this reason, there was a problem in that the adjustable range of speed set by the foot pedal adjustment device was always constant, and if the maximum speed was increased, delicate adjustments could not be made.

Further, in order to make the above-mentioned fine adjustment possible, there was a problem in that the variable range of the resistance value had to be made small.

[Purpose of invention]

This idea was devised by focusing on these conventional problems, and its purpose is to attach a sensor that can detect pressure to the foot pedal so that the speed can be adjusted depending on the amount and position of the foot pedal. To provide a foot pedal adjustment device that allows volume etc. to be controlled arbitrarily.

[Structure of the idea]

In order to achieve the above object, the present invention includes: a sliding variable resistor that converts the rotation angle of a foot pedal into an electrical quantity; a pressure sensor that converts the weight applied to the hinge portion of the foot pedal into an electrical quantity; and a control circuit for controlling the control unit by the electrical quantity obtained by the sliding variable resistor, and the amplification degree of the control circuit is controlled by the output from the pressure sensor. The gist of this is that

[Example of idea]

Embodiments of this invention will be described below based on the accompanying drawings.

FIG. 1 is an embodiment of the present invention, and shows a cross-sectional view of a foot pedal adjustment device for controlling the motor speed of a sewing machine, etc., in which 1 is rotatably attached to one end on a case 2 via a hinge part 3. The foot pedal 1 is attached to a spring 4.
is always biased upward to maintain a constant inclination angle.

A rod-shaped rack 5 is attached to the tip end of the foot pedal 1, and this rack 5 meshes with a pinion 7 connected to a sliding variable resistor 6. In addition, a pressure sensor or a pressure-sensitive conductive rubber switch (for example, a
A pressure sensor 9 (such as Japanese Patent Publication No. 56-9187, Japanese Patent Publication No. 56-54019) is provided, and this pressure sensor 9 is connected to a control circuit 10 by an electrical quantity obtained by the sliding variable resistor 6. I am trying to control the amplification level.

That is, by pressurizing the foot pedal 1 with your foot or the like, the pressure sensor 9 is pressurized via the actuator 8 attached to the hinge section 3 of the foot pedal 1, and at the same time, the pressure sensor 9 is pressurized in the opposite direction to the hinge section 3. The provided pinion 7 moves to operate the sliding variable resistor 6.

With this configuration, the pressure sensor 9
By applying pressure to the sewing machine, the variable width of the motor speed of the sewing machine can be arbitrarily changed, and the speed range can also be similarly controlled using a sliding variable resistor 6 or the like.

Next, FIG. 2 shows a block diagram of the control circuit 10 at that time, where 11 is a power supply circuit, 12 is a gain adjustment circuit, 13 is a voltage output circuit, and 14 is a voltage output. These components make up the control circuit. It consists of

To operate this, a change in resistance is extracted as a change in power supply voltage 11 by a sliding variable resistor 6, and this voltage is controlled by a gain adjustment circuit 12 controlled by a pressure sensor 9. do.

Then, the voltage output circuit 13 converts the voltage into a voltage to operate the motor.

FIG. 3 is an example of an output characteristic diagram at this time. Let the x-axis be the force of pushing the pedal, and the y-axis be the output at that time.

A straight line passing through the origin represents the maximum speed value of the motor, etc., and is controlled by the gain adjustment circuit 12. Further, the straight line and dotted line in the y-axis direction are adjusted by a conventional sliding variable resistor 6.

Therefore, in this way, you can freely adjust the speed of the sewing machine's motor, and also freely control the motor speed of machine tools, cars, trains, etc., and freely adjust the volume of electronic musical instruments, etc. It is possible to adjust.

[Effect of idea]

As mentioned above, this idea allows you to control the variable width depending on how much you press the pedal and where you press it, so you can freely fine-tune the speed, making it very easy to use for beginners and for detailed work. The type of adjustment device has the effect of being applicable in a wide range.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the foot pedal adjustment device, FIG. 2 is a block diagram of the control circuit, and FIG. 3 is an output diagram when this invention is implemented. 1... Foot pedal, 3... Hinge section, 6...
Sliding variable resistor, 9...pressure sensor, 10...
control circuit.

Claims (1)

[Scope of utility model registration request] A sliding variable resistor that converts the rotation angle of the foot pedal into an electrical quantity, a pressure sensor that converts the weight applied to the hinge portion of the foot pedal into an electrical quantity, and the sliding variable resistor. 1. A foot pedal adjustment device comprising: a control circuit for controlling a control unit according to an electrical quantity generated by the foot pedal, and an amplification degree of the control circuit is controlled according to an output from the pressure sensor.