JPS5866618A - Controller for material cutting unit - Google Patents

Abstract

PURPOSE:To improve reliability in performance, by including such a condition that the count of a counter reaches the desired value in the condition required to reset the counter. CONSTITUTION:According as a pulse 6a is produced out of a pulse generator 6 with a crop shear 1 driven by a drive unit 3, the count of a counter 7 progresses whereby a pulse generator 10 produces a signal 10a. In the duration of the signal 10a still alive, if a signal 5a of a censor 5 is generated, an AND gate 11 opens and thereby a signal 11a is outputted. While the signal 10a is ungenerated, even if the censor 5 gives forth the signal 5a, the AND gate 11 will not open. In this controller, it is so designed that a period of resetting the counter is determined according to the contents thereof and yet the counter can be reset to only the senor's pulse produced in this period, so that reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the drive of a material cutting device (crop shear) provided in a conveyance facility.

Conventionally, there has been a device of this type as shown in FIG.

In FIG. 1, 1 is a crop shear, 2 is a drive shaft that drives the crop shear 1, 3 is a drive device that drives the drive shaft 2, 4 is a disk that is attached to the drive shaft 2 and rotates as a unit, 5 6 is a sensor that optically detects the rotation of the disc 4 and generates one pulse 5a with each rotation; 6 is attached to the rotation shaft of the drive device 3;
I is a counter that counts the pulses 6a of the pulse generator 6, makes the count correspond to the rotational position of the crop shear 1, and is reset by the pulse of the sensor 5, and 8 is a counter that is based on the count result of the counter 7. Signal 7
A is a control circuit for controlling the driving of the drive device 3, and 9 is a material to be cut by the crop shear 1.

FIG. 2 is a layout diagram of the disk 4 and the sensor 5. A hole 4a is provided on the disc 4, and when the disc 4 is rotating, the light beam from the emitter 5b provided at one end of the sensor 5 enters the receiver 5C through the hole 4a. , the photoreceiver 5c generates a pulse 5a.

FIG. 3a shows an ideal waveform of the pulse 5a output from the light receiver 5C, and FIG. 31) shows the contents of the signal 7a of the counter 7 in an analog manner.

Figure 4 is a diagram showing the working process of crop shear 1.
The (360°) position is the reset position, the 900° position is the cutting position, and the 270° position is the timing position.

Next, the operation will be explained. The driving unit 3 drives the crop shear 1, and causes the pulse generator 6 to generate pulses 6a synchronized with the driving, and causes the counter 7 to count the pulses 6a. When the sensor 5 generates the pulse 5a, the counter 7 is reset and the count value becomes zero as shown in FIG. The content of this count is the 4th
As shown in the figure, it corresponds to each position of the pusher 1,
Based on this, the drive device 3 controls its rotation speed and stop timing.

Conventional drive control devices have the following configuration3), so if the sensor malfunctions, there will be a mismatch in the correspondence between the crop shear and the contents of the counter, resulting in inaccurate control operations. There were drawbacks.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by including the condition that the counter count has reached a predetermined value as the condition for resetting the counter, the reliability of operation can be improved. It is an object of the present invention to provide a drive-side device capable of increasing.

An embodiment of the present invention will be described below with reference to the drawings. Fifth
In the figure, 10 indicates that the signal 7a of the counter 7 is the count α
A pulse generator 11 generates a signal 10a with a predetermined pulse width when the pulse 5a of the sensor 5 and the signal 10a are generated.
This is an AND gate that takes the AND of , and generates a signal 11a. The signal 11a is input to the counter 7 as a reset signal for the counter 7.

The operation will be explained with reference to the timing diagram of FIG. As the driving device 3 drives the crop shear 1 and the pulse generator 6 generates the pulse 6a, (4) the count of the counter 7 progresses as shown in FIG. 6 (1), and when it reaches the count α, the pulse Generator 10 generates signal 10
a (Fig. 6b) is generated. When the signal 5a of the sensor 5 (FIG. 6a) is generated during the period when the signal 10a is generated,
AND gate 11 opens and signal 11a (FIG. 6C) is output. Even if the sensor 5 generates the signal 5a during a period when the signal 10a is not generated, the AND gate 11 will not open. Since the signal 11a resets the counter 7,
The count of the counter 7 is as shown in FIG. 6d.

Note that in the above embodiment, the signal 10a of the pulse generator 10 is wider than the period in which the pulse 5a of the sensor 5 is normally output, but it may be wider than that period or narrower than that period. The pulse width may be any width as long as it can reset the counter 7.

As described above, the period in which the counter can be reset is determined from the content of the counter, and only the pulses of the sensor that occur within this period are reset by K.
Therefore, the reliability of the operation of the device can be increased.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a drive control device of a conventional material cutting device, Fig. 2 is a layout diagram of the sensor shown in Fig. 1, and Fig. 3 is a timing diagram explaining the operation of the drive control device shown in Fig. 1. , FIG. 4 is a working process diagram of a material cutting device, FIG. 5 is a block diagram of a drive control device for a material cutting device according to an embodiment of the present invention, and FIG. 6 is a diagram showing the operation of the drive control device shown in FIG. FIG. 2 is a timing diagram for explanation. DESCRIPTION OF SYMBOLS 1... Material cutting device (crop shear), 3... Drive circuit, 4... Disc, 5... Sensor, 6, 10...
- Pulse generator, 7... Counter, 8@... Control circuit, 11... AND gate. In addition, in the figures, the same reference numerals indicate the same parts. Agent Shin Kuzuno (1 other person)

Claims (1)

[Claims] a driving device that drives the material cutting device; a sensor that detects a predetermined rotational position of the material cutting device and generates a pulse; a first pulse generator that generates a pulse according to rotation of the driving device; a counter that counts the pulses of the first pulse generator; a control i1 circuit that controls the driving device according to the count contents of the counter; and a second pulse generator that generates a pulse when the count of the counter reaches a predetermined value. and a gate circuit that generates a reset pulse that resets the counter when the pulse of the second pulse generator and the pulse of the sensor match.