JPS6229805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an accurate automatic positioning device applied to slide adjustment of a press.

Conventional technology Conventional automatic positioning devices set the amount of movement in advance and read that amount into a preset counter to automatically perform positioning. For example, in a slide adjustment device, the adjustment position of the slide is In this method, the amount of movement corresponding to the position where the upper and lower dies sandwich the material and overlap is determined in advance and inputted into a preset counter for automatic positioning. Therefore, when a work load is applied, the space between the upper and lower molds increases due to elongation of the press frame, etc., reducing processing accuracy. For this reason, preload setting is performed in which automatic positioning is performed in a preload state at the time of positioning, but automatic positioning is performed by adjusting the amount of adjustment empirically.

Problems to be Solved by the Invention Conventionally, when performing preload setting using a preset counter, a preload state was generated by adding a further amount corresponding to the preload amount to the amount of movement. This method has a problem in that it takes time and effort to calculate the amount empirically and add it to the preset setting amount.

Means for Solving the Problems The present invention aims to provide an automatic positioning device with preload setting that eliminates this troublesomeness and expands the automatic positioning function.

This device is a preset counter automatic positioning device with a preload setting device added.
This device is also capable of preload setting by using pulse signals in the normal rotation (downward) direction among phase and B phase input pulses (with a 90° phase difference).

Embodiment A block diagram of an embodiment of the present invention is shown in FIG.

E is an encoder connected to a drive source such as a slide adjustment device, and the encoder E is provided with an A-phase proximity switch (SWA) and a B-phase proximity switch (SWB), which have a phase difference of 90° as E rotates. The A-phase pulse and B-phase pulse are output. The A-phase pulse and the B-phase pulse are input to a forward/reverse rotation determination circuit, which determines whether the driving direction of the moving device is forward or reverse rotation.

Section P is a preset counter automatic positioning device. The A-phase pulse and B-phase pulse move the up/down reversible counter in the down direction during forward rotation.
When reversing, count in the up direction. When the reversible counter counts up or down and matches the set value of the preset counter, the output relay (X ₁ or X ₂ ) is activated, stopping the drive source and completing automatic positioning. _X1 is an output relay for high-speed positioning, and _X2 is an output relay for low-speed positioning.The high-speed type can be used for rough positioning, and the low-speed type can be used for fine positioning.

Next, the L section is a preload setting device, which is added to the preset counter automatic positioning device of the P section. Pb is a preload cut-off pushbutton, which inputs only pulses in one of the forward rotation direction and reverse rotation direction from the A-phase and B-phase pulses. In this embodiment, a pulse in the forward rotation (down) direction is input. The preload timer circuits 1 and 2 set the preload state using a time constant based on empirical rules. When the preload timer detects the preload state, the preload output relay _X3 is activated, stopping the drive source and completing automatic positioning in the preload state.

Note that when the preload setting device is used, the preset counter positioning device does not operate because the preset adjustment amount is not input.

Operation Next, the operation of the preload setting device will be explained based on the timing diagram of the A-phase and B-phase input pulses shown in FIG.

When the B-phase pulse is input with a delay of 90 degrees with respect to the A-phase pulse, the forward rotation/reverse rotation determination circuit determines the forward rotation direction. When the preload cut-off pushbutton Pb is turned on, the A phase input pulse is sent to the preload timer circuit 1.
and 2.

A phase pulse signal is preload timer circuit 1
Since the signal is inverted by an inverter and input to the preload timer circuit 2, the preload timers 1 and 2 are alternately set or reset by the rising or falling signal of the A-phase pulse.

Also, for preload timer 1, the pulse rise time until it reaches preload detection level 1 is set to t ₁ , and for preload timer 2, the pulse rise time until it reaches preload detection level 2 is set to t ₂ . Then, set the time constant of each timer based on the empirical rule of the preload state,
When the pulse rise time reaches _t1 or _t2 , the preload state is detected and the output relay _X3 is activated to complete the automatic positioning of the preload setting.

Now, during slide adjustment, when the upper mold descends and hits the lower mold, the rotation of the drive source decreases and the encoder E
There is a delay in the timing of the A-phase pulses as shown in "A". Therefore, the reset signal for timer 2 is not input, and timer 2 detects preload when time _t2 has elapsed.

Note that even if timer 2 fails, timer 1 is set after a time delay of "i", and preload is detected when time _t1 is reached.

When the preload cut-off pushbutton Pb is turned off, the preload setting device is stopped and the preset counter automatic positioning device is activated instead.

Effects of the Invention According to the present invention, when performing preload setting in the slide adjustment of a press, the conventional preset counter automatic positioning device either calculates the push-in amount empirically and adds it to the preset setting amount, or sets it separately. Whereas it was necessary to add an independently operated preload setting device, with this device, preload setting can be performed by turning the preload cut-off pushbutton to ``on'', and by turning the same pushbutton to ``off''. Automatic positioning of the preset counter can be performed. That is, since either one can be switched and used as desired, functionality has been significantly improved. The equipment has also been easily miniaturized, making maintenance and inspection easier. In addition, compared to the conventional preset setting of the amount of push-in based on experience, this device detects the preload state by actually hitting the ball, so the reliability of the preload setting is increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the device of the present invention, and FIG. 2 is a timing diagram of A-phase and B-phase pulses when preload setting is performed. E is an encoder, P is a preset counter automatic positioning device, L is a preload setting device, and Pb is a preload cut-off push button.

Claims (1)

[Claims] 1 an encoder connected to a drive source of a mobile device;
A forward rotation/reverse rotation discrimination device that determines whether the rotation is forward or reverse by receiving pulses having a phase difference between A phase and B phase transmitted from the encoder; A preset counter automatic positioning device consisting of a reversible counter that counts in the direction and an output relay that stops the drive source when the count of the reversible counter matches the set value of the preset counter is connected to the A preload setting device is added that inputs a pulse signal for rotation in one direction of rotation or reverse rotation, detects the preload state using a preload timer, and stops the drive source, so that positioning can be performed in the preload state instead of a preset counter. Automatic positioning device with preload setting for slide adjustment of presses.