JPS5915041B2 - Automatic cutting device for automatic planer for woodworking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic board width reading and cutting device that automatically determines the amount of cut that matches the board width by reading the board width in an automatic planer for woodworking. be.

In conventional automatic planing machines, depending on the capacity of the electric motor, when applying the depth of cut, the width of the workpiece is measured and the depth of cut is determined to match the width of the workpiece.

(If the depth of cut was increased, there were inconveniences such as burnout of the motor and damage to the belt.

) Therefore, it was necessary to always consider the board width and depth of cut when working.

The purpose of the present invention is to eliminate the drawbacks of the prior art described above, prevent overloads on electric motors, belts, etc., and provide a novel method that automatically sets the depth of cut that matches the width of the workpiece. Our goal is to provide automatic planing machines.

The present invention provides a plurality of plate thickness detectors in the width direction of the workpiece of the lifting member, detects the plate thickness, and detects the thickness of the plate depending on whether or not one of the plurality of detectors operates. It detects the width of the workpiece and receives the signal to control the lifting distance of the lifting member and provide the depth of cut.

One specific example of the present invention will be explained using FIGS. 1 and 2.

In FIG. 1, an elevating member 3 is arranged opposite to a material feeding table 2 supported by a support member 1, and the material feeding table 2 and the elevating member 3 form a material feeding path.

A button 6 having a plurality of material feeding rollers 5 and a plane blade 7 is rotatably supported on the lifting member 3 and rotated by an electric motor (not shown).

The elevating member 3 is supported by a plurality of columns 4 so as to be movable up and down, and is moved up and down by a reversible elevating motor 8 and a screw shaft 9.

A lifting distance detecting means consisting of a disk 10 having a slit is provided on the axis of the screw shaft 9, and a detector 11 for detecting the presence or absence of a slit in the disk 10 is further provided.

As shown in FIG. 2, a plurality of roller type detectors 12 to 17 are provided at the front end of the elevating member 3 (the right side in FIG. 1 is the front end).
The detection means consisting of the following are arranged so as to be able to be raised and lowered independently.

Next, the elevation control circuit shown in FIG. 3 will be explained.

In FIG. 3, reference numeral 18 indicates a lifting slot. By operating this switch, the relay coil 38 is excited, the normally open relay contact 40 is energized, the reversible lifting motor 8 rotates forward, and the screw shaft 9 The elevating member 3 is raised via the .

19 is a lowering switch, and when the workpiece 43 is set and the switch 19 is operated as shown in FIG. via relay coil 3
9 is energized, the normally open relay contact 41 is energized, the reversible lifting motor 8 is reversely rotated, and the lifting member 3 is lowered.

As the elevating member 3 moves downward, a plurality of detectors 12
When the thickness of the wood 43 to be processed is detected by 17, the differentiating circuits 20 to 25 connected to each detector output a pulse having a minute pulse width in response to the rising signal from each detector. do.

The output of each of the differentiating circuits 20 to 25 is input to an OR gate 26.

Since the width of the pulses output from the differentiating circuits 20 to 25 is minute, they do not overlap each other, and the number of pulses corresponding to the number of activated detectors among the detectors 12 to 17 is output from the OR gate 26. arise.

The output pulses of the OR gate 26 are then counted by a counter calculation circuit 27.

The counter calculation circuit 27 calculates the depth of cut that can be cut on all sides according to the count number, and outputs this as an output signal.

Here, the counter calculation circuit 27 gives the maximum allowable depth of cut when the count number is 1, that is, when the plate width is narrow, and gives the minimum allowable depth of cut when the count number is 6, that is, when the plate width is wide. Outputs the calculated signal.

On the other hand, 29 is a depth of cut setting switch, which is composed of a digital switch, a rotary switch, a keyboard, etc., and is used to set the depth of cut for one time to an arbitrary value below the allowable depth of cut, for example in finishing cutting. Used in cases.

The comparator 28 is a circuit that receives the output signal of the switch 29 and the output of the counter calculation circuit 27 and determines the magnitude of both. When it is larger than the output value, that is, when the set input value exceeds the allowable depth of cut, the output Q2 of the comparator 28 is set to low level, the gate 31 is turned off, and the output Q0 is set to the bilevel, so that the gate 30 is turned on and the output of the counter arithmetic circuit 27 is loaded into the counter 32. Conversely, when the value input from the cutting amount setting switch 29 is smaller than the value output from the counter 27, that is, the set input value is the allowable cutting amount. When it is within the range, the output Q0 of the comparator 28 is set to low level, the gate 30 is turned off, and the output Q2 is set to by level, the gate 31 is turned on, and the output of the cutting amount setting switch 29 is loaded into the counter 32. .

The counter 32 is enabled to perform a counting operation when the CLR signal is at the bi level, and after receiving the rising output signal of the OR gate 26, the set/reset circuit 33 is set and its first output is inverted from the low level to the bi level.
The pulsed output signal of the detector 11 is transmitted to the T input terminal of the counter 32 via the AND gate 34, and the rise of the output signal is counted. When the value input to the D input terminal is counted, the Invert the output Q from bi level to low level.

In response to the low level, the output of the AND gate 37 becomes low level, the excitation of the relay coil 39 is stopped, the normally open relay contact is deenergized, the reversible movement of the reversible electric motor 8 for lifting is stopped, and the voltage is adjusted according to the board width. The lowering of the lifting section stops at the position where the depth of cut is applied.

On the other hand, in response to the falling signal of the output Q of the counter 32, the set/reset circuits 33 and 35 are reset via the differentiating circuit 36 which generates a pulse, and their 1 side output is set to a low level.

At the same time, the counter 32 which uses the 1 side output of the set reset circuit 33 as a clear input stops counting operation, and inverts its output Q from low level to by level.
Return to initial state.

According to the present invention, a plurality of detection means are provided on the elevating member disposed above the material feeding table, and the detection means detects the plate thickness, and how many of the plurality of detectors are activated. This makes it possible to further control the lifting and lowering of the lifting member by detecting the width of the workpiece and using a lifting control circuit that operates based on both signals. This allows work to be done with a depth of cut that matches the machine's capacity, without placing an excessive load on belts, etc.

[Brief explanation of drawings]

FIG. 1 is a front view showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a block diagram showing a circuit of the present invention. In the figure, 1 is a support member, 2 is a material feeding table, 3 is a lifting member, 4 is a column, 5 is a material feeding roller, 6 is for a button, 7 is a plane blade, 8 is a reversible electric motor for lifting, and 9 is a screw shaft. , 10 is an elevation distance detection means, 11 is a detector, 12 to 17 are detection means, 1
8 is a rising switch, 19 is a descending switch, 20-2
5 and 36 are differentiating circuits, 26 is an OR gate, 27 is a counter operation circuit, 32 is a counter, 2B is a comparator, 29
30 and 31 are gates, 33 and 35 are set/reset circuits, 34 and 37 are AND gates, 38 and 39 are relay coils, 40 and 41 are normally open relay contacts, 42 is a power supply, 43 is a It is the workpiece material.

Claims (1)

[Claims] 1. In an automatic planer for woodworking, in which a button and a material feed roller are attached to a lifting member, and the lifting member is driven by a reversible electric motor to raise and lower, an lifting distance detection means digitally detects the lifting distance of the lifting member. A plurality of detection means for detecting the surface of the workpiece are arranged in the width direction of the workpiece at the front part of the lifting member for the button, and the plurality of output signals of the detection means are counted, and a tolerance is determined according to the number of counts. a count calculation circuit that outputs the amount of cutting, and a detection signal from any one of the detection means to start counting the output of the lifting distance detection means;
An automatic cutting device characterized in that a cutting amount is adjusted by providing a counter means that outputs an output and stops the reversible motor when the count reaches a value corresponding to the output of the counting calculation circuit.