JPH0443933Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a switch mechanism, and more specifically, to an actuator operating mechanism related to a micro switch.

Prior Art and Its Problems A conventional actuator operating mechanism is shown in FIG. In the figure, 11 is a drive body that is rotationally driven in the direction of arrow A, 12 is a hinge lever type micro switch, and a protrusion 1 is fixed to the outer periphery of the drive body 11.
3, the micro switch 12 is operated by pushing down the hinge lever 14a and pushing the push button 14b to the operating position.

This type of switch operation mechanism is often used, for example, in copying machines to detect the movement of a document table, the position of a variable magnification dial, and the like. However, in the above mechanism, due to installation errors, etc., the protrusion 13
There are variations in the positional relationship between the hinge lever 14a and the position of the protrusion 13 and the micro switch 12.
The ON/OFF timing is not necessarily the same every time, and for this reason, the micro switch 12
When trying to obtain information such as rotation angle by turning ON/OFF, there is a problem with the accuracy of information detection, which reduces the stability and reliability of copying machines and the like as system equipment.

Means for Solving the Problems Therefore, the present invention makes it possible to make the micro switch ON/OFF timing constant with respect to the position of the operating body, and uses a driving body that is rotated or linearly driven, a microswitch whose actuator is a push button; an operating body that is normally pressed by the force of a spring and protrudes from the driving body; and an operating body that is installed between the microswitch and the driving body and that responds to the driving of the driving body. An operating body guide plate that pushes the operating body into the drive body against the spring force and instantly releases the pushed spring force at the end edge of the plate to operate the push button type actuator. By eliminating the cam-like operating mechanism of the switch and using a dog type that directly operates the push button, the dog uses the spring force of the spring to instantaneously operate the actuator only at a predetermined position, thereby turning the switch ON. The basic feature is that the /OFF timing is constant.

Embodiments Hereinafter, the present invention will be specifically explained with reference to embodiments shown in the accompanying drawings.

In FIG. 1 showing one embodiment, a driving body 1 fixed to a rotating shaft 1a is rotationally driven in the direction of an arrow A. As shown in FIG. The micro switch 2 includes a push button 4 as an actuator, and is positioned and fixed so that the axis of the push button 4 is directly below the axis of the rotating shaft 1a.

The driving body 1 is provided with four operating bodies 3, 3, . is in a state of

That is, as shown in the partial cross section of FIG. 1a,
A spring 5 is accommodated in a cavity 1b formed in the driving body 1, and the operating body 3 is equipped with a flange 7 on the back having a diameter slightly larger than a hole 6 formed slightly larger than the diameter of the operating body 3. It is pressed in the radial direction of the drive body 1, and the flange 7 serves as a stopper and normally protrudes long from the drive body 1 in a pushable state.

The operating body guide plate 8 is fixed between the driving body 1 and the microswitch 2 so as to roughly follow the outer peripheral surface of the driving body 1, and guides the top portion 3p of the operating body 3 by contacting the same. The top portion 3 of the operating body 3 advancing in the direction of arrow A at the receiving end 8a of the operating body guide plate 8
Contact and welcome p. As the operating body 3 rotates, it resists the spring force of the spring 5 in FIG.
As shown in FIG. At the other edge 8b of the operating body guide plate 8, where the top portion 3p of the operating body 3 is out of contact with the operating body guide plate 8, this gradually compressed spring force is instantly released. The top portion 3p of the operating body 3 momentarily pushes down the push button 4 of the actuator to the operating position, as shown in FIG. 1a. A pulse-like signal is output from the microswitch 2. This signal is accurately synchronized with the position of the operating body 3 (the position shown in FIG. 1a).

To ensure this accuracy, the operating body guide plate 8
The release edge 8b is set to have a predetermined positional relationship with respect to the position of the push button 4 in consideration of the diameter of the operating body 3 and the rotational speed of the driving body position. Also,
The spring constant of the spring 5, the flange-shaped stopper 7, etc. are determined by considering the stroke of the push button 4, and
It is designed under conditions that do not cause vibrations in the movable piece.

FIG. 2 shows another more functional embodiment. When the drive 1 is driven in the A direction and also in the B direction opposite to the A direction, the micro switch 2 is turned ON or OFF at the position of the operating body in each rotation direction. Note that the same reference numerals as in FIG. 1 indicate the same or equivalent parts, and detailed description thereof will be omitted.

The characteristic feature is that the operating body 3 is an operating base 3a,
It is composed of two members: an operation main body 3b rotatably provided on the base body 3a. Operation body 3b
is rotatably supported by a pin 20 implanted in the end of the operating base 3a, and is constantly biased counterclockwise in the figure by a coil spring 21 fitted to the pin 20. The opposite side of the end of the operation base 3a provided with the pin 20 forms a stopper 22 that resists the biasing force of the coil spring 21, and when the operation body 3b is stopped by this stopper 22, it is rotated against the axis of the operation base 3a. The axes of the operating body 3b become parallel, and both become rigid in the radial direction of the driving body 1.

Therefore, as shown in FIG. 3a, when the operating body rotates in the direction A in a rigid state and is guided by the guide plate 8, the guide plate 8 gradually rotates, as in the embodiment shown in FIG. The spring force stored in the pushed spring 5 is momentarily released at the release edge 8b, and the operating body 2
instantaneously operates the push button 4 of the micro switch 2 to the operating position (the state shown in FIG. 2). On the other hand, when rotating in the direction B in the rigid state, the operation main body 3
When b comes into contact with the push button 4, the push button 4 is pushed like a cam and the micro switch 2 is operated.
When the side surface comes into contact with the open edge 8b of the operating body guide plate 8, it is bent more deeply into a dogleg shape, and then climbs onto the operating body guide plate 8 (see FIG. 3b).
When the operating body 3b comes out of contact with the operating body guide plate 8, the operating body 3 returns to its rigid state again. When the rotational direction of the driving body 1 is reversed from direction B to direction A, the position of the operating body 3 changes to the correct position as shown in FIG.
ON/OF signal is output from micro switch 2.

However, in the embodiment described above, in the case of rotation in the B direction, a cam-like operation type similar to the conventional example is used, and it may not be possible to obtain an accurate timing signal as aimed at by the present invention. However, this example
It is useful when high precision is required in the rotation in the A direction, but not so much precision in the B direction. For example, in the paper feed mechanism of a copying machine,
It can be used as a paper feed roller activation signal and a registration roller activation signal. In other words, when rotating in the A direction,
Use the ON signal as a signal for starting the registration roller,
The ON signal when rotating in the B direction is used as a signal to start the paper feed roller. In this case, the start timing of the registration rollers requires high precision in order to align the leading edge of the copy paper and the toner image. Regarding the activation of the paper rollers, since the paper can be aligned later with the registration rollers, some variation can be tolerated.

In each of the above embodiments, the operating body 2 rotates or rotates, that is, the driving body 1 is rotationally driven, but the operating body may be provided in a similar manner to a linearly driven driving body. Of course, an accurate timing signal can be obtained for the position of the operating body. FIG. 4 shows a linear drive system substantially the same as the configuration shown in FIG. 2. The driving body 1' is A,
It is linearly reciprocated in the B direction. The microswitch 2 is activated when the operating body 3 is driven in the A direction, and is inactivated when the operating body 3 is driven in the B direction. In addition, the same reference numerals as in FIG. 2 indicate those having the same or equivalent functions.

FIG. 5 shows an example of application of the linear drive system to a copying machine with a movable document table. It shows the instantaneous state when the micro switch 2 fixed to the main body 33 is operated. A microswitch 2 provides an activation timing signal for a registration roller that aligns an image on a photoreceptor drum (not shown) with the leading edge of the copy paper.

Normally, the document table 31 returns to the maximum in the direction of arrow b, receives a copy start signal from the stopped home position, and starts a scanning operation. In the home position, the retractable operating body 3 is located on the left side of the slope-shaped operating body guide plate 8' in the figure, and when the scan operation starts in the direction of arrow a, the vertically rigid operating base 3a and the operating body 3b are both pushed up against the spring 5 by the slope portion of the guide plate 8'. When the operating body 3 is further scan-driven and reaches the edge 8'b of the guide plate 8', the tip of the operating body 3b slides past this edge 8'b, and the vertically rigid operating body 3 is moved by the spring 5. The spring force stored in the switch instantly pops out to the stop position, and the push button 4 of the micro switch 2 is pressed down. The microswitch 2 outputs an activation timing signal whose positional relationship is precisely synchronized with the registration roller. Note that when the document table 31 is returned, the operation body 3 is the same as the explanation in FIGS. 2 and 4, and the operation body 3 is a foldable operation body 3b.
slides on the upper part of the push button 4 without being caught, bends into a dogleg shape at the guide plate edge 8'b, climbs onto the guide plate 8', and returns together with the document table 31.

The startup of the registration roller, that is, the registration timing, requires accurate input timing, but by applying the present invention, it has become possible to suppress the variation in this timing to an extremely small range, as described above. . This stabilizes the alignment of output images on copy paper in copying machines, and reduces the occurrence of misprints to almost zero, for example, when copying originals onto preprinted paper or when making sequential multicolor copies. be able to.

Effects of the invention As is clear from the above explanation, the present invention is configured to directly and instantaneously operate the pushbutton using the urging force of the spring, so that the operation input timing of the micro switch becomes constant. , the performance of general system equipment that uses the output of the microswitch can be stabilized.

[Brief explanation of the drawing]

Figures 1a and b are views showing one embodiment of the present invention, Figure 2 is a view showing another embodiment, and Figures 3a and b are views showing a second embodiment of the present invention.
4 is a diagram showing still another embodiment, FIG. 5 is a diagram showing an application example of the embodiment according to the present invention, and FIGS. 6 a and 6 b are diagrams showing a conventional example. It is a diagram. 1, 1', 31...Driver, 2...Micro switch, 3...Operation body, 4...Push button, 5...
Spring, 8, 8'... Operating body guide plate.

Claims (1)

[Scope of utility model registration request] A driving body that is rotated or linearly driven, a microswitch whose actuator is a push button, an operating body that is normally pressed by a spring force and protrudes from the driving body, and installed between the microswitch and the driving body. and pushes the operating body into the drive body against the spring force in response to the drive of the drive body, while instantly releasing the pushed spring force at the edge thereof to operate the push button actuator. A switch mechanism characterized by comprising an operating body guide plate for controlling the operation body.