JPS6219440Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixed position stopping device for a variable speed press that allows the rotational speed of the press to be changed according to the press operation.

Currently, fixed position stopping devices for variable speed presses are generally used to control the variable speed range of variable speed presses in two or three stages, such as high, low, high, medium, etc.
In this method, the speed is divided into low speeds, and the required speed in each range is considered as the representative speed of that range, and the stop signal transmission angle is determined and switched. Moreover, since the transmission angle of the stop signal does not match the actual rotation angle of the press, the stop position varies widely, and the accuracy cannot be said to be sufficient.

The present invention aims to provide a fixed position stopping device for a variable speed press that eliminates these drawbacks.

The press requires maximum slip angle at maximum press speed when stopped. If the press speed is low, the slip angle becomes smaller accordingly. The slip angle is the rotation angle from when a stop signal is sent until the press stops, and is measured in advance for the press. Normally, the stop signal transmission position for the maximum sliding angle is at or slightly after the crank angle of 180° (bottom dead center) of the press, and the regular stopping position is at or slightly before top dead center. In order to always stop at a fixed position, if the set speed of the press becomes low, the stop signal transmission position will change.
The sliding angle corresponding to the set speed may be set at a position rotated from the bottom dead center or a position slightly later than the bottom dead center by a rotation angle obtained by subtracting the sliding angle from the maximum sliding angle. The change in slip angle corresponding to the change in press speed varies depending on the GD ² and brake capacity of the press. This invention connects a rotary switch attached to a press speed setting device to a decoder, converts the rotation angle by the decrease of the slip angle at the set speed from the maximum slip angle at the maximum speed into a digital signal, and then interlocks with the crankshaft. Connect the proximity switch and counter corresponding to the pulse disk to count the rotation angle from the fixed position at which the stop signal should be sent at the maximum slip angle of the crankshaft as a digital signal, and set from a comparator that compares the two. It is an object of the present invention to provide a fixed position stopping device for a variable speed press that can obtain a transmission position of a press stop signal corresponding to the speed.

To explain the drawings of one embodiment of the present invention,
The present invention connects a rotary switch 2 that works with a press speed setting device 1 consisting of a volume that controls the speed of the main motor (not shown) of the press to a decoder 3, and connects a rotary switch 2 that works with a decoder 3 to a pulse disk 4 that is connected to a crankshaft. Proximity switch 5 is installed on the press side in correspondence with position A, and proximity switch 5 is installed on the press side in correspondence with position A. A counter 6 is provided which inputs a pulse signal that detects irregularities, and the counter 6 and the decoder 3 are connected via a comparator 7.
This fixed position stopping device for a variable speed press is characterized in that it has a configuration in which a press stop signal is obtained at a count corresponding to the set speed of a speed setting device 1.

Next, to explain the operation of this device, the rotary switch 2, which is mechanically linked to the press speed setting device (volume), determines how many pulses to detect at intervals of 5 degrees, for example, based on the slip angle data of the press. The decoder 3 is programmed to determine whether to stop at a predetermined position, and the decoder 3 converts the incoming decimal code signal into a BCD code.

The pulse disk 4, which is mechanically linked to the crank angle of the press, has unevenness as shown in the figure, so a proximity switch 5 provided close to the unevenness generates pulses. One pulse obtained by this is made to match the rotation of the crank angle of 5 degrees in the previous example. Position A is set in advance as the position where a stop signal is issued when the press is rotating at the highest stroke rate per minute. The counter 6 counts the number of pulses and outputs the BCD code, and when the signal from the counter 6 and the BCD code output from the decoder 3 completely match, a press stop signal is sent to the press stop circuit 8. The press will stop at the fixed position.

Incidentally, it is also possible to use a rotary encoder instead of the pulse disk 4, but
Then, since the pulses come in continuously due to the rotation of the press, it is necessary to detect the origin at the beginning of counting, but according to the present invention, the slip angle is set at the position of ○A at the maximum number of strokes per minute, and the sliding angle is set at the position of Since the number of strokes is determined by counting pulses from the position of ○a, the above-mentioned origin detection is not necessary.
Also, the rotary switch 2 is the press speed setting device 1.
The decoder 3 can be programmed with a signal that matches the characteristics of the slip angle of the press.
Can be installed on any press.

Further, since the structure is simple, the cost is low.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the configuration of the present invention. 1 is a press speed setting device, 2 is a rotary switch, 3 is a decoder, 4 is a pulse disk, 5 is a proximity switch, 6 is a counter, 7 is a comparator,
8 is a press stop circuit.

Claims (1)

[Scope of utility model registration request] In a device that stops a variable speed press at a fixed position, it is installed in conjunction with the crankshaft of the press,
A pulse disk is provided with unevenness for each required rotation angle during a half-circle in the opposite direction to the rotation direction from position A corresponding to the maximum slip angle at the maximum speed of the press, and a pulse disk corresponding to position A of the pulse disk. A proximity switch provided on the press side, a counter that counts the pulse signal that the proximity switch sends by detecting the unevenness of the pulse disk, and a rotation that should send a press stop signal in conjunction with a press speed setting device. The press is characterized by comprising a decoder that generates a digital signal corresponding to the angle, and a comparator that compares signals from the counter and the decoder and sends a signal to operate a press stop circuit when both signals match. Fixed position stop device for variable speed press.