JPH022306Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a foot pedal adjustment device, and more specifically, a variable resistor that is applied to the foot pedal of industrial sewing machines, electronic musical instruments, etc. This invention relates to a foot pedal adjustment device with a built-in foot pedal.

[Prior art]

Conventional foot pedal regulators for industrial sewing machines, etc., adjust the speed by the amount or angle of pedal depression. For this reason, the speed adjustable range set by the foot adjuster is always constant, and there is a problem in that if the maximum speed is increased, delicate adjustments cannot be made.

Therefore, there was a problem in that the variable width had to be made small in order to enable fine adjustment.

[Purpose of invention]

This invention was devised by focusing on these conventional problems, and its purpose is to easily fine-tune the control width of the control unit by changing the pressing position and amount of foot pedal depression. This provides a foot pedal adjustment device that can improve operability and reduce operator fatigue.

[Structure of the idea]

In order to achieve the above object, this invention has a foot pedal adjustment device that controls the control range of the control section by changing the resistance value. A variable resistance means is embedded therein, the variable resistance means consisting of a resistor disposed in the upper part of the resistor, a switch means which is electrically connected depending on the pressed position, and a flexible conductor laid on the upper surface of the switch means. and a sliding resistor whose resistance value changes with rotation of the foot pedal are connected in series.

[Example of idea]

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

FIG. 1 shows a longitudinal sectional view of a foot pedal adjustment device embodying this invention, in which a base end 3 of a foot pedal 2 is rotatably attached to a case 1 via a hinge portion 4. ing.

The foot pedal 2 includes a resistor 6 arranged inside the pedal cover 5 in the longitudinal direction thereof, and a switch means 7 on the upper part of which is electrically connected depending on the pressed position.
Furthermore, a variable resistance means 9 composed of a flexible conductor 8 laid on the upper surface of the switch means 7 is buried.

The switch means 7 is made of a material such as pressure-sensitive conductive rubber, which does not conduct electricity when no pressure is applied, but allows electricity to flow when pressure is applied (for example, Japanese Patent Publication No. 56-9187, Japanese Patent Publication No. 56-54019). Or, when the flexible conductor is not pressurized, it does not contact the lower electrode,
A spacer, such as a polyester mesh film, which comes into contact with the spacer during pressurization is used.

Further, the foot pedal 2 is always urged upward by a spring 1 interposed between the foot pedal 2 and the case 1 so as to have a constant inclination angle.

Further, 11 is a spacer for maintaining a distance between the flexible conductor 8 and the resistor 7.

A rod-shaped rack 12 is fixed to the tip side of the foot pedal 2, and this rack 12 meshes with a pinion 14 connected to a variable resistor 13 (sliding resistor). Further, this variable resistor 13 is connected in series with the variable resistance means 9.

Next, FIG. 2 is a block diagram of an embodiment of this invention, in which 20 is a power supply circuit for operating the motor, 9 is a flexible conductor 8 embedded in the foot pedal 2, and switch means 7 is shown. , a variable resistance means composed of a resistor 6 and a spacer 11, and 21 a voltage output circuit.

Next, FIGS. 3a to 3d are explanatory diagrams of the operation of an embodiment of this invention, in which FIGS. 3a and 3b represent a non-pressurized state, and FIGS. 3b and 3c represent a pressurized state. There is.

To operate this, the flexible conductor 8 is brought into contact with the resistor 6 through the switch means 7 by depressing the foot pedal 2. (Figure 3 b, c). For this reason, the resistance value of the foot pedal adjuster itself changes. For example, in the case of FIG. becomes larger.

Next, in the case of FIG. 3c, since contact occurs at the tip of the foot pedal 2, the resistance value of the variable resistance means 9 becomes small, and the resistance value of the circuit becomes small. Furthermore, if the connection between the variable resistor 13 and the variable resistance means 9 is changed as shown in Fig. 3, the operation will be reversed from that in Fig. 3b and Fig. 3c, and when contact occurs at the tip of the pedal 2, the circuit resistance becomes smaller.

Therefore, if the connection is made as shown in Figure 3a, it will be easier to adjust the motor speed on the high speed side.
By connecting as shown in Figure d, it becomes easy to adjust the motor speed on the low speed side.

By providing a switch inside the circuit to change the connection between the variable resistor 13 and the variable resistance means 9, the motor speed can be freely adjusted.

Therefore, in addition to widening the range of adjustment of the motor speed of sewing machines, it can also be used, for example, to freely control the motor speed of machine tools, automobiles, trains, etc., or to freely adjust the volume of electronic musical instruments, etc. It can be applied.

〔Effect of the invention〕

As mentioned above, this invention allows you to arbitrarily control the variable width of the resistance depending on the position and amount of depression of the foot pedal, so you can freely finely adjust the speed, making it easier to operate the foot pedal, and making it easier to operate the foot pedal. This has the effect of improving productivity and reducing worker fatigue.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a foot-operated adjustment device embodying this invention, FIG. 2 is a block diagram showing its control circuit, and FIGS. 3a to 3d are explanatory diagrams of the operation by the foot pedal. 2... Foot pedal, 4... Hinge section, 6...
Resistor, 7... Switch means, 8... Flexible conductor, 9... Variable resistance means, 13... Variable resistor (sliding resistor).

Claims (1)

[Scope of utility model registration request] In a foot pedal adjustment device that controls the control range of the control unit by changing the resistance value,
A foot pedal that can be rotated via a hinge has a resistor arranged in its longitudinal direction inside the foot pedal, a switch means that conducts electrically depending on the pressed position above the resistor, and a flexible conductor laid on the upper surface of the switch means. The foot pedal adjustment is characterized in that a variable resistance means is embedded therein, and the variable resistance means and a sliding resistor whose resistance value changes according to rotation of the foot pedal are connected in series. Device.