JPH106304A - Apparatus abnormality detecting for automatically reciprocating cutting wood planer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a loss of a commodity value of a material to be worked by a method wherein even in a state where a pulse signal from an encoder can not be obtained in a control circuit, and inversion control becomes impossible, the material to be worked is prevented from slipping out to an opposite side to drop. SOLUTION: A pulse signal from an encoder is counted with a counter circuit. When the pulse signal is regularly counted, the signal is outputted to a relay coil. Though a timer contact 19b is open in order to close a relay contact 20a, driving of a reversible motor 3 is continued. Since inversion control can not be continued when the pulse signal is not counted, in order to open the timer contact 19b while the relay contact 20a is open as it is, the reversible motor 3 is stopped to be driven, and its stop is informed of with a lamp 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting abnormalities in a planer that performs automatic reciprocal cutting.

[0002]

2. Description of the Related Art In a conventional automatic reciprocating cutting planer, there is no discriminating circuit for judging a signal from a rotation amount detector due to a failure of a rotation amount detector, a contact failure, a disconnection, or the like.

[0003]

In the conventional automatic reciprocating cutting planer, since the reversible motor is driven even if the signal from the rotation amount detector cannot be obtained, the processing material is fed to perform the cutting. However, since the reversible motor does not reverse, the work material does not return to the front side and slips out to the opposite side, and in some cases, the work material falls. In addition, if the processed material falls, the commercial value of the processed material is lost, such as being damaged and becoming dirty.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art. When the signal from the rotation amount detector cannot be obtained, the drive of the reversible motor is stopped to prevent unexpected removal of the work material and dropping. This is to prevent abnormal operation.

[0005]

An object of the present invention is to form a material-feeding path by means of a sheet-feeding means driven by a reversible motor and an opposing planer blade, and to allow a work material to pass through an appropriate position in front of the planer blade in the material-feeding path. A detector for detecting the rotation amount of the reversible motor is detected by a rotation amount detector interlocked with the reversible motor, and the signal of the detector is received to invert the reversible motor in accordance with the moving amount of the workpiece. In a planer having reversing means and performing automatic reciprocal cutting by reversing a work material, a discriminating circuit for determining whether or not a signal from a rotation amount detector is output to the reversing means is provided, and no output is provided. This is achieved by providing control means for stopping the driving of the reversible motor.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a main body showing an embodiment according to the present invention.

In FIG. 1, a table 2 is provided on a base 1, and a driving roller 4 driven by a reversible motor 3 and interlocked with the reversible motor 3 is provided above the table 2.
Is provided, and a head 8 having a material feeding belt 6 for feeding a processing material 7 via a driven roller 5 is provided, and a material feeding path is formed between the upper surface of the table 2 and the lower surface of the head 8. . The head 8 is supported by a pair of columns 9, and can be moved up and down via an elevating screw 10. A planer blade 11 is disposed at the center of the upper surface of the table 2, and a detector 12 that detects the passage of the workpiece 7 (hereinafter, referred to as a rear end) is provided at an appropriate position in front of the planer blade 11 on the table 2 in the material feeding path. Is provided. Further, an encoder 13 for ordering a pulse in accordance with the rotation amount of the reversible motor 3 is provided so as to be interlocked with the reversible motor 3.

Next, a description will be given with reference to FIGS. When the operation switch 15 is operated to cut the workpiece 7, the output signal becomes logic “1” and is output to the relay coil 16 and the counter circuit 17. First, since the relay coil 16 is energized, the relay contact 16a is closed and the reversible motor 3 is closed.
The forward rotation relay coil 18 is energized, and the relay contact 18a
Is closed, the reversible motor 3 is driven forward and the relay contact 1
8a 'is also closed, so the relay coil 18 is self-held,
At the same time the timer contact 19b after the timer coil 19 is also energized time T ₁ is open. On the other hand, the logical "1" signal is also output from the operation switch 15 to the clear terminal of the counter circuit 17, so that the counter circuit 17 becomes operable. Also,
The reversible motor 3 is driven, and a pulse signal is output from the linked encoder 13 to the counter circuit 17, for example, 5 pulses (in the time from when the operator operates the operation switch 15 to when the workpiece 7 is inserted). Counting a very short time), it is determined that the pulse signal from the encoder 13 has been input to the control circuit, and the relay coil 20
To a logic "1" is output, the relay coil 20 is energized, the time T ₂ after the relay contact 20a is closed. The time T ₁ of the timer coil 19 is set in advance to T ₁ > T ₂ ,
Since the relay contact 20a is closed before the timer contact 19b is opened, the reversible motor 3 continues to be driven forward while the relay coil 18 is kept energized, and the workpiece 7 is cut.

Here, if the pulse signal from the encoder 13 cannot be received by the counter circuit 17 due to a failure of the encoder 13, a broken wire, a contact failure, or the like, the output of the counter circuit 17 remains at logic "0". And the relay coil 20 is not energized and the relay contact 20
a remains open. Timer coil 1 as described above
9 is energized, the timer contact 19b is opened, the self-holding of the relay coil 18 is released, and the driving of the reversible motor 3 is stopped. At the same time, the relay contact 20b is kept closed, the timer contact 19a is closed, the lamp lighting coil 21 is energized, and the relay contact 21a is closed, so that the lamp 22 is turned on to notify that the reversible motor 3 has stopped. FIG. 4 is a time chart showing a case where the pulse signal from the encoder 13 is normal and a case where the pulse signal cannot be received due to some abnormality.

Next, when the workpiece 7 is fed in a normal state and the detector 12 detects the rear end of the workpiece 7, a logical "1" signal is output to the clear terminal of the counter circuit 23.
The counter circuit 23 becomes operable. Since a pulse signal is also output from the encoder 13 to the counter circuit 23, when a predetermined pulse corresponding to the distance is counted from the position where the rear end of the workpiece 7 passes through the detector 12 to the position where the rear end is inverted, the counter A logic "1" from the circuit 23 is output to the relay coil 24, the relay contact 24a is closed, the reversing motor 3 reverse coil 25 is energized, the relay contact 25a is closed, the reversible motor 3 is driven in reverse, and the Since the contact 25a 'is also closed, the relay coil 25 is held by itself. The stop control of the reversible motor 3 during the switching of the reversible motor 3 from the normal rotation to the reverse rotation is performed by a control circuit (not shown).

As described above, the control circuit is composed of an analog circuit and a logic circuit. However, it is also possible to perform this control by a control program using a microcomputer.

As described above, when the pulse signal cannot be received by the control circuit due to the failure of the encoder 13 or the like, the feeding is stopped and the stop is notified by the lamp 22, so that the workpiece 7 is inverted. It was inserted without noticing that it did not come out, and it did not accidentally slip out to the other side or dropped.

[0013]

According to the present invention, apart from a counter circuit which counts a pulse signal from an encoder linked to a reversible motor for reversing a workpiece at a predetermined position,
A determination circuit for determining whether a pulse signal from the encoder is input to the control circuit is provided.If the pulse signal is not input, the drive of the reversible motor is stopped, and a means for notifying that the motor has stopped is provided. Since it is provided, it is possible to avoid the danger of the worker coming out of the opposite side of the work material and dropping the work material unexpectedly, and also to keep the commercial value of the work material.

[Brief description of the drawings]

FIG. 1 is a front view of a main body showing an embodiment according to the present invention.

FIG. 2 is a control circuit.

FIG. 3 is a block diagram.

FIG. 4 is a time chart.

[Explanation of symbols]

2 Table, 3 Reversible motor, 7 Work material, 8 Head, 11 Planer blade, 12 Detector, 13 Encoder, 15 Operation switch, 16, 18, 20, 21, 2.
4, 25 ... relay coil, 17, 23 ... counter circuit,
19: timer coil, 22: lamp.

Claims (2)

[Claims] 1. A sheet feeding path is formed by a sheet feeding means driven by a reversible motor and a facing planer blade, and a detector for detecting the passage of a work material at an appropriate position in front of the planer blade in the sheet feeding path is provided. A reversing means for detecting a rotation amount of the reversible motor by a rotation amount detector linked to the reversible motor, receiving a signal from the detector, and reversing the reversible motor in accordance with a movement amount of the processing material, comprising: In a planer that performs automatic reciprocating cutting by reversing, a discriminating circuit for discriminating whether or not a signal from a rotation amount detector is output to the reversing means is provided. An automatic reciprocating cutting plane abnormality detecting device, comprising a control means for stopping. 2. An apparatus for detecting an abnormality of an automatic reciprocating cutting planner according to claim 1, further comprising an alarm device for receiving an output signal from said discriminating circuit and for displaying a signal or a buzzer.