JPS61231690A - Stroke counter for reciprocating section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stroke counter for a reciprocating portion as set forth in the preamble of claim 1.

In known stroke counters of this type, a limit switch is provided as a sensor component at one end of the stroke, so that it closes and opens exactly once during each reciprocating movement of the reciprocating part. A simple counter belongs to the response circuit activated by the output signal.

However, if the stroke changes due to changing motion conditions of the reciprocating part, for example if the reciprocating part causes a variable coefficient of friction or a large fluctuating load, a limit switch installed at the end of the stroke is used to control the stroke. Counting is dangerous. In this case, the limit switch is not reliably activated, resulting in an erroneous stroke count.

In the present invention, the stroke counter described in the preamble of claim 1 is formed so that the entire executed stroke can be accurately counted even when the amplitude of the stroke distance of the reciprocating portion varies.

This object is achieved by a travel counter according to claim 1.

In the stroke counter according to the present invention, the two sensors of the sensor component are located within the working stroke range apart from both stroke ends, so that each working stroke can be reliably passed through even in the case of a changing moving part 141. .Therefore, there will be no omission of strokes when counting.In addition to the sensor component having two sensors separated from each other, the output signals of the sensors IJ- are combined by a connecting circuit, so it is always a forward stroke or a backward stroke ( It is ensured that only the

Other advantageous configurations of the invention are described in the claims.

In the stroke count described in claim 2, it is possible to switch from forward strokes 1 to 1 to backward strokes 1 by a signal changeover switch.

The coupling circuit according to claim 3 can be achieved with a small number of inexpensive modules.

According to another configuration of the present invention as set forth in claim 4,
By resetting the counter of the response circuit, it is at the same time also ensured that the correct initial state of the bistable multi-by-break circuit (flip-flop) of the coupling circuit is set.

The present invention will be explained in detail below by way of examples in conjunction with the drawings. This figure illustrates a stroke counter that is associated with a double-acting pressure-medium actuated cylinder.

First, analog counting during the forward movement will be explained.

In the drawing, a double-acting pressure medium working cylinder is indicated at 10, the piston rod of which is marked with a marker 12.

The marker 12 operates together with the two sensors 14 and 16,
The sensor 4 is supported by a plate 18 attached to the working cylinder 10 and has a predetermined spacing in the direction of movement of the working cylinder 10.

Marker 12 may be a component made of magnetic material, for example, in which case sensors 14, 16 are inductive sensors. Alternatively, the marker 12 can also be an optically operated marker applicator, in which case the sensor 1
4.16 can be said to be a light-shielding operating device (light barrier) that operates by reflection.

Furthermore, the marker 12 may be a cam, in which case the marker 12 may be a cam.
The two sensors 14 and 16 can be said to be mechanically operated limit switches.

No matter what type of marker 12, sensor 14, 16, each sensor 14, 16 generates an output pulse when each marker 12 passes.

The output signals of sensors 14, 16 are passed through a two-pole signal changeover switch 20 to a response circuit generally designated 22.

In the illustrated position of the signal changeover switch 20, the output signal of the sensor 16 is transferred to the bistable vibrator circuit 24.
set implant].

Sensor 140 output is bistable vibrator circuit 2
4 and the input of the delay circuit 26.

The two inputs of the AND module 28 are connected to the output 1'' of the bistable vibrator circuit 24 and/or to the output 1'' of the delay circuit 26.

The output of the AND module 2B is connected to the count terminal of a digital counter 30, and the display of each counter is continuously displayed by the digital display unit 32.

The switch 4 is used for resets 1 to 1 of the counter 30 and is also connected to the reset heir of the bistable vibrator circuit 24.

During the forward movement of the piston, when the screws 1 to 1 of the operating cylinder 10 move from left to right in the drawing, the marker 12 moves to the sensor 1.
When passing through No. 14, first the bistable vibrator circuit 24
Moved to Karisen 1. Therefore, after a certain period of time,
Pulses subsequently sent from the delay circuit cannot pass through the AND module 2B.

When marker 12 then passes sensor 16, bistable vibrator circuit 24 is set to allow the adapted delayed output pulse of delay circuit 26 to pass through AND module 28, causing counter 30 to go high.

During the backward stroke of the working cylinder, the marker 12 first passes the sensor 16. However, since the marker has already reached the sensor 14 before the adaptive delay pulse is generated at the output 1 of the delay circuit 26, the output signal of the sensor 1/14 is transmitted to the resen 1~terminal of the bistable vibrator circuit 24. The bistable pipe 1 now circuit 24 is resensed and the adaptive delayed output pulse of the delay circuit 26 cannot pass through the AND module 2B. Therefore, also during the backward stroke of the working cylinder, no pulses are applied to the counter 30 at all.

By switching the signal change-over switch 20 to the second operating position, which is shown in dotted lines in the drawing, one stroke of the operating cylinder (after which it is not necessary to describe it in detail here) is carried out.

[Brief explanation of drawings]

FIG. 1 shows an overall configuration diagram of an embodiment of the present invention. 1'l, 16...sensor 24-28...Connection circuit 20...Signal switching circuit 26...Delay circuit 28...Conjunctive module module 30...Counter

Claims (1)

[Claims] 1. A sensor component (14,
16) and a response circuit (22) connected thereto, the sensor components being spaced apart from each other in the direction of movement.
The response circuit (22) has two sensors (14, 16), both located in the travel section,
Connection circuits (24 to 28) that receive the output signals of 4 and 16)
The connecting circuit passes only the output signal of one of the sensors (14, 16), and the output signal of the sensor (14, 16) is passed first.
A stroke counter for a reciprocating part such as a piston rod or plunger, which is passed only when an output signal from the other side is received. 2. Two sensors (14, 16) and connection circuit (24-2
8) A stroke counter for a reciprocating part according to claim 1, further comprising a signal changeover switch (20) interposed between the stroke counter and the signal changeover switch (20). 3. The coupling circuit has a bistable vibrator circuit (24), one input of which is coupled to one of the sensors (14, 16) and the other input is coupled to the other of the sensors and , the other of which is coupled to the input of the delay circuit (26), and the coupling circuit further comprises an AND module (28) whose first input is connected to the bistable vibrator circuit (26).
24) and a second input is coupled to the output of the delay circuit (26). 4. The reset terminal of the bistable vibrator circuit (24) is coupled to the reset terminal of the counter (30) of the response circuit (20) which is coupled to the output of the AND module (28). A stroke counter of the reciprocating part according to item 3.