JPH0333481B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a stationary electric woodworking machine, such as an electric planer,
In band saws, the wood to be processed is processed into a predetermined size by driving the cutter, so the wood to be processed is placed on a table and the distance between the cutter and the wood is adjusted according to the amount of wood to be cut. The present invention relates to an electric woodworking machine equipped with a positioning device that positions a piece of wood to be processed by moving it using external power.

Conventionally, in the case of a stationary electric woodworking machine, such as an electric planer, the positioning device for the wood to be processed is a device that works in conjunction with a ball screw for driving the table and outputs an analog or digital signal corresponding to the number of rotations of the ball screw. A two-phase rotary encoder or a pulse generator is used, but in the case of a pulse generator, for example, a counter is required to count the pulses from the pulse generator, and when the power is turned on, the table is
The counter must be reset after returning to the mechanical home position, and in order to prevent problems such as loss of position detection due to the counter being cleared when the power switch is turned off or during a power outage, it is necessary to back up the power supply. In addition to requiring a stray charge power source, the one-chip microcontroller built into electric woodworking machines has a limited storage capacity and slow access time, which limits the table movement speed. It was hot.

The purpose of the present invention is to simplify the structure and easily and accurately adjust the distance between the cutter and the wood according to the amount of wood to be cut, regardless of whether the power is on or off and without the need for a backup power source. It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional art by providing a stationary electric woodworking machine with a positioning device capable of positioning and displaying.

Next, the configuration of a first embodiment of the present invention will be explained with reference to FIGS. 1 to 5.

Automatic cutting of the surface of the workpiece 3 with a plane blade 5 driven by the motor M2 while feeding the workpiece 3 on the table 2 that moves up and down via the lifting shaft 1 driven by the motor M1 with a feed roller 4 driven by a motor (not shown). A rotary encoder 8 for detecting the moving position of the table 2 is attached to the frame 7 of the plane board 6 so as to be interlocked with the table 2 via a rack 9 and a pinion 10.

This rotary encoder 8 divides the circumference into 10 equal parts, and divides each lane into lanes A to D of BCD codes 0 to 9.
A printed circuit board 11 has a latch lane L and a power supply lane P concentrically formed on the surface of a disk to prevent reading errors near the boundaries of BCD codes 0 to 9. In addition to arranging multiple pieces on the same axis according to the number of decimal digits,
Connect each printed circuit board 11 from pinion 10 to gear G1
~ G4, rotate by 1/10, and connect the lead wires 13 of the contacts 12A to 12D, 12L, and 12P that contact each lane A to D, L, and P of each printed circuit board 11.
It is formed in a state where it is pulled out to the outside.

Next, FIG. 5 is an electrical circuit diagram of this embodiment, and shows the AC power supply via the main switch SW1.
The rotation direction of the AC is switched by turning on and off the forward/reverse switching relay
A reversible motor M1 whose DC power source for braking is controlled on and off by turning it on and off, and a motor M2 for driving the planer blade 5 which is controlled by turning on and off a processing switch SW4 are connected. In addition, the output from rotary encoder 8 has a latch.
BCD-7 segment decoder/driver circuit
The input is sent to the display device DP in which 7 segment display elements are arranged through the DEV, in this case, the display device DP attached to the front of the automatic plane board 6, and the display device
The position of the table 2 detected by the rotary encoder 8 is displayed on the DP.

In Fig. 5, R1 is a resistor, D1 is a diode, C1 and C2 are capacitors, W1 and W2 are the windings of the reversible motor M1, and each relay
The normally open contacts of No. 1 and X2 are marked with a after each relay code, and the normally closed contacts are marked with b after each relay code.

Next, the operation of this embodiment will be explained.

First, using a predefined jig, the planer blade 5
With the amount of protrusion adjusted, the rotary encoder 8 outputs a signal corresponding to the dividing dimension between the table 2 and the tip of the planer blade 5.

Therefore, in this state, the operator should not turn the foot switch.
When SW2 and SW3 are operated to move the table 2 up and down via the motor M1, the batch size is displayed on the display DP via the rotary encoder 8, and as a result, the operator can respond to the batch size. The table 2 can be easily positioned. FIG. 6 is an electric circuit diagram of the second embodiment of the present invention, in which, after measuring the amount of protrusion of the planer blade 5, the samer switch SW5 is set and the planer is turned off from the samer switch SW5. BCD-7 segment decoder/driver circuit with latch is input with the output signal corresponding to the protrusion amount of the blade 5 and the output signal corresponding to the distance between the feed roller 4 and the table 2 from the rotary encoder 8 to the subtraction circuit SUB. The configuration, operation, and effects are almost the same as in the first embodiment, except that the distance between the tip of the planer blade 5 and the table 2 is displayed on the display DP via the DEV.

Next, the configuration of a third embodiment of the present invention will be explained with reference to FIGS. 7 and 8.

In this case, the output from the position setting device PS such as a keyboard or digital switch that sets the positioning position of the table 2 corresponding to the dividing dimension, the output corresponding to the dividing dimension from the rotary encoder 8, and the raising of the table 2, Safety upper and lower limit switches LS1 and LS2 that define the lower limit
, the output from the start switch SW6 that is operated when the table 2 starts moving, and the output from the processing switch SW4 that is operated during cutting. The output from the MPU 14 is sequentially stored in the RAM, and the output from the MPU 14 is used to control each relay X1 to X3 on and off via each driver circuit DCV1 to DCV3, and to display the position of the table 2 on the display DP. The configuration is almost the same as that of each embodiment.

Next, FIG. 8 is a flowchart of microcontrol for positioning the table 2, and the positioning operation will be explained according to this flowchart.

When the power switch is turned on, the system first initializes to clear all the devices, then stores the initial values in the RAM in the MPU 14,
In this state, when the operator sets the table 2 position corresponding to the dividing dimension on the position setting device PS and presses the start switch SW6, the output signal S1 corresponding to the table 2 setting position from the position setting device PS and the rotary encoder The output signal E1 corresponding to the current position of table 2 from 8 is read, and the output signal E1 corresponding to the current position of table 2 from
1” is calculated, and “|S1−E1|=
0”, it is further determined that “S1-E1>0”, and when this determination is YES, motor M1 rotates forward and table 2 rises, and the value of |S1-E1| is required to slow down motor M1. For example, D1
In order to convert M1 control to pitch feed without inertia when the distance is reached, "|S1-E1|>D
1" is determined, and with this determination NO, motor M1 is controlled by pitch feed and "|S1-E1
|=0'', the motor M1 stops, and the table 2 is positioned at the position set by the position setting device PS.

Further, when the above-mentioned "S1-E1>0" judgment is NO, the motor M1 rotates in the reverse direction to lower the table 2, and as in the case of normal rotation, the motor M1 moves the table 2
is positioned at the position set by the position setting device PS and then stopped.

Next, the effects of the present invention will be explained.

The present invention involves placing the wood to be processed on the table of a stationary electric woodworking machine and adjusting the distance between the cutter and the wood in order to process the wood to be processed into a predetermined size by driving a cutter. A positioning member is moved via external power according to the amount of cutting, and a BCD code of 0 to 9 is placed on the surface of a disc that rotates in conjunction with the movement of the positioning member, dividing the circumference of the disc into 10 equal parts. A plurality of code plates each having a conductor pattern are arranged in accordance with the number of digits of a decimal number, and each bit of the BCD code pattern on the code plate is moved from a preset reference position by the output from the contact brush that contacts each bit. An electric woodworking machine equipped with a positioning device includes a position detector that detects the amount of movement of the positioning member, and a display that converts the output from the position detector into a decimal number and displays it.

As a result, the present invention provides a positioning member for a stationary electric woodworking machine with a positioning device, for example, a table 2.
In addition to mechanically returning to the origin for positioning, there is no need to set the position detector counter value to 0, and woodworking work can be easily carried out while maintaining sufficient reproducibility. In addition to reliably maintaining the positioning state, even if the position of the positioning member is shifted by manual operation when the power is turned off, the position after the movement is displayed on the display when the power is turned on. Since no memory circuit is required, the electrical circuit is simple and no backup power is required when the power is turned off.As a result, it can be used in harsh working environments such as sawmills where only the roof is exposed to the outside air. It can withstand the use of electric woodworking machines, prevents malfunctions due to electrical noise, and has the effect of easily positioning the positioning member in electric woodworking machines while maintaining the compact size of the electric woodworking machine. .

In particular, since the present invention uses an absolute type position detector, electric woodworking can The distance between the cutter and the wood to be processed placed on the table of the machine can be easily set according to the amount of wood cut, and a contact brush is used to read the values on the position detector. Unlike optical rotary encoders, it does not cause problems such as false detection or failure to detect due to dust adhesion, and it can withstand use at woodworking sites with poor environments.

[Brief explanation of the drawing]

FIG. 1 is a front view of the automatic plane board 6 according to the first embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is an explanatory diagram showing the code of the printed circuit board 11, and FIG. 4 is the gear G1. -Explanatory diagram showing the G4 arrangement, FIG. 5 is an electric circuit diagram thereof, FIG. 6 is an electric circuit diagram of the second embodiment of the present invention, and FIG. 7 is an electric circuit diagram of the third embodiment of the present invention. FIG. 8 is a flowchart of the microcontrol. 1: Lifting axis, 2: Table, 3: Processed material, 5:
Planer blade, 6: Automatic planer board, 8: Rotary encoder, 9: Rack, 10: Pinion, 11: Printed circuit board, 14: MPU, 12A to 12D, 1
2L, 12P: Contact, M1: Motor, DP: Display, PS: Position setting device, X1, X2: Relay,
DVC1, DVC2: Driver circuit, G1 to G4:
Gear, DEV: BCD-7 segment decoder/driver circuit with latch.

Claims (1)

[Claims] 1 In order to process the wood to be processed into a predetermined size by driving the cutter, the wood to be processed is placed on the table of the stationary electric woodworking machine, and the distance between the cutter and the wood is adjusted to the amount of wood to be cut. A positioning member is moved according to the external power, and a BCD code pattern of 0 to 9 is placed on the surface of a disc that rotates in conjunction with the movement of the positioning member, dividing the circumference of the disc into 10 equal parts. 10 pieces of code plates formed by
a position detector that detects the amount of movement of the positioning member from a preset reference position based on the output from a contact brush that is arranged in accordance with the number of digits of the base number and contacts each bit of the BCD code pattern of the code plate; and a display device that converts the output from the position detector into a decimal number and displays it.