JPS6334801B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for controlling the width of a piece of wood to be processed, which is used in an electric corner chisel equipped with a corner only moving device that automatically guides only the corner to the center position of the width of the piece of wood to be processed. The present invention relates to a column center position detection mechanism that determines the center position of the column.

An object of the present invention is to provide a column center position detection mechanism of this type that has a simple structure, reduces weight increase, has good position detection accuracy, and is highly practical. There is a particular thing.

In the present invention, when the workpiece wood is held between a movable vise and a fixed vise that are arranged opposite to each other, the origin of the distance is set to the reference point A on the side where the movable vise of the base is attached. , in the distance along the width direction of the workpiece wood, the distance between the base point A and the pressing surface of the workpiece wood of the fixed vise is L, the base point A
The distance between the moving vise and the pressing surface of the workpiece wood is l
Then, focusing on the fact that the distance from the base point A to the center in the width direction of the wood to be processed is expressed as (L+l)/2, as a means of measuring the distance l that changes depending on the width of the wood to be processed, , a position detection target is installed at one point of the base and the moving vise, and a target detector for detecting the position detection target and a detector for measuring the moving distance of the target detector are used to detect the column center of the wood to be processed. It is designed to detect the position.
The present invention will be explained below with reference to Examples.

1 is a piece of wood to be processed (hereinafter simply referred to as wood); 2 is a planar base placed on the piece of wood 1; 3 is a horizontal member 2a of the base 2 via a screw mechanism.
A threaded rod 3a is attached so that it can move forward and backward in the width direction of the wood.
It is a moving vice connected to the tip of the Reference numeral 4 denotes a stationary vise that is fixed to the tips of arms 6 that are respectively latched and fixed to the vertical members 2b, 2b of the base 2, and is provided opposite the moving vise 3. The wood 1 is clamped and fixed by the pressure of the moving vise 3 and the fixed vise 4, and the pressing of the moving vise 3 is performed by rotating the lever 5. The arm 6 is provided with two holes spaced apart in its longitudinal direction, and by changing the hole position into which the locking pin 7 is inserted, the locking position of the fixed vise 4 can be adjusted depending on the width of the wood 1. can be selected in two stages. In FIG. 1, the arm and lock pin of the fixing vise 4 on the right side are omitted. 9 is the horizontal member 2a of the base 2
10 is a base position detection target consisting of a magnet and a ferromagnetic pin fixed to the surface of the movable vice 3, and 10 is a movable vice position detection target having the same structure as the detection target 9 attached to the surface of the movable vice 3. Detection target 1
0 has the same height as the detection target 9, and is aligned in a line in the width direction of the wood 1 in FIG. 11 is a magnet fixed to the surface of the fixed vise 4, and 12 is a locking and fixing position detector installed on the vertical member 2b of the base 2. At this time, the magnets 11 are maintained in a mutual positional relationship so that they are directly below and close to the locking/fixing position detector 12. 13
14 is a slide frame movable in the longitudinal direction of the timber 1 (in the horizontal direction in FIG. 1) along a guide 16 to be described later. Two columns 35, 35 stand upright from the slide frame 14, and the main body 8 is supported by the columns 35, 35 so as to be movable up and down, and the corner chisel 13 is fixed to the lower end of the main body 8. The main body 8 includes a rotating means (not shown) for a rotary cone 23 housed in the corner only 13, and a corner only 1.
3 has a built-in power means (not shown) that provides vertical movement. Reference numeral 15 designates two parallel slide bases held on the base 2 so as to be slidable in the width direction of the timber 1 (vertical direction in FIG. 1), and the base 15 moves the slide frame 14 in the longitudinal direction of the timber 1. It has two parallel guides 16, 16 that are slidably and loosely fitted to the slide frame 14 so as to be movable in the left-right direction in FIG. 1. Reference numeral 17 denotes a threaded rod fixed to both ends of the slide base 15 in parallel with the guide 16, and the movement of the slide frame 14 is controlled by a gear device of a slide frame feed motor 18 provided on the slide frame 14.
This is done by engaging and rotating. Reference numeral 19 denotes a slide base feed motor provided on the base 2, and the movement of the slide base 15 is caused by rotation of a feed screw rod 20 fixed to a gear device of the slide base feed motor 19 as it engages with a screw hole provided on the slide base 15. done by doing. From the above configuration, the main body 8 is front and rear (top and bottom in Figure 1), left and right,
It is movable in three directions, up and down, and the corner 13 fixed to the main body part 8 is also movable in three directions.

Reference numeral 21 denotes a target detector for detecting the positions of the base position detection target 9 and the moving vice position detection target 10 fixedly arranged at the lower part of the slide frame 14, and in this embodiment, a magnetic sensing element such as a Hall element is used. There is. 22 is a measuring device consisting of a squared disk fixed to the rotating shaft of the slide base feed motor 19 and a photo interrupter;
A predetermined number of pulses are output for each rotation, and the moving distance of the target detector 21 in the width direction of the wood 1, that is, the moving distance of the slide base 15 in the width direction of the wood 1 is determined by counting the number of output pulses. be measured. These target detectors 21 and detectors 22 are used to detect the base position detection target 9 and the moving vice position detection target 10.
This constitutes a distance detection device that detects the distance between the two.

24 is a position detection magnet embedded and fixed in the surface of the base 2, and 25 is a ferromagnetic pin arranged vertically with its lower end in contact with the surface of the magnet in order to improve position detection accuracy. ,
21 is a target detector fixedly arranged at the lower part of the slide frame 4 mentioned above. 26 is a toggle flip-flop that inputs the output of the target detector 21, and 27 is a counter that counts the number of output pulses of the detector 22 when the output of the flip-flop 26 is at a high level. It is output to the arithmetic unit 28. Reference numeral 29 denotes a fixed vise position corrector that corrects the center position according to the selected fixed position of the fixed vise 4 to the calculation result of the calculating unit 28 according to the output state of the locking fixed position detector 12; The calculation result is output to the column center position buffer 31 of the motor control device 30. 32 counts the number of output pulses of the detector 22 from the time when the output of the flip-flop 26 reaches a high level, and corrects the counting result using a corner only position corrector 33, so that only the corner of the motor control device 30 is always at the center position. This counter provides an output to the buffer 34. The rotational drive of the slide base feed motor 19 is controlled by the control output of the motor control device 30.

To explain the column center position detection mechanism having the above configuration, the slide frame feed motor 18 is driven to rotate, and the slide frame 14 is moved toward the slide frame feed motor 19 side of the base 2 and stopped. By this operation, the target detector 21 is positioned on a vertical plane passing through the base position detection target 9 and the moving vice position detection target 10. Next, motor control device 3
Slide base feed motor 19 by the command of 0
When the target detector 21 is rotated, the target detector 21 moves to a position slightly past the base position detection target 9 on the opposite side to the moving vice position detection target 10 and stops. The above operation completes preparations for detecting the column center position. In response to a command from the motor control device 30, the slide base feed motor 19 starts rotating in the opposite direction to that described above, and the target detector 21 moves in the direction of the fixed vise 4 to start detecting the column center position. The counters 27 and 32 constantly output pulses from the detector 22 in response to the amount of movement of the target detector 21, and when the target detector 21 passes directly above the base position detection target 9, the target detector 21 outputs a short high level pulse. This pulse is output to the flip-flop 26, and the signal output at the output terminal of the flip-flop 26 is held at a high level until a high level pulse is input again. From the moment the output terminal of the flip-flop 26 becomes a high level, the counters 27 and 32 start the detector 22.
Start counting the output pulses of counter 3.
From 2 onwards, only the corner position corrector 33 is used as the target detector 21.
The count number, which has been corrected to increase the count corresponding to the distance b between the detection center and the center of the corner only 13, is always output to the corner only current position buffer. By moving the slide base 15, the target detector 21
When the device passes directly above the moving device position detection target 10, the target detector 21 outputs a short high-level pulse to the flip-flop 26, and the signal output at the output terminal of the flip-flop 26 is reversed from the previous high level to the low level. However, the counter 27 calculates the count result of the number of pulses output from the detector 22 while the signal output at the output end of the flip-flop 26 is at a high level, that is, the distance between the target centers of the base position detection target 9 and the moving vice position detection target 10. A count number corresponding to the distance l is output to the calculator 28.

Here, the target center of the base position detection target 9 and the fixed vice 4 when the fixed vice 4 is at the solid line position
If the distance between the pressing surface of the timber 1 and the pressing surface of the timber 1 is La, and the distance between the target center of the moving vise position detection target 10 and the pressing surface of the timber 1 of the moving vise 3 is a, then the width of the timber 1 is La-(l+a) Therefore, if the origin of the distance is set at the target center of the base position detection target 9, then
The widthwise center of the timber 1, that is, the column center position is expressed as {l+(La+a)}/2.

Similarly, the position of the column center when the fixed vise 4 is at the position indicated by the chain line is represented by {l+(La+a)}/2. At this time, for example, when the fixing vise 4 is at the solid line position, the magnet 11 is at a position away from the locking and fixing position detector 12, so a low level signal is output from the locking and fixing position detector 12, and the fixing vise is From the position corrector 29, a correction value of the count corresponding to the distance La is added to the calculator 28. On the other hand, when the fixing vise 4 is at the chain line position, the magnet 11 is directly below the locking fixing position detector 12, a high level signal is output from the detector 12, and a signal corresponding to the distance Lb is output from the corrector 29. The corrected value of the counted number is added to the arithmetic unit 28. Therefore, when the fixed vise 4 is at the solid line position, when a count number corresponding to the distance l is added from the counter 27 to the arithmetic unit 28, and a count number corresponding to the distance La is added from the corrector 29, in the arithmetic unit 28, { l+(La+a)}/2 is calculated, and the column center position buffer 31 has the distance {l+(La+a)}/2.
The count number corresponding to is output. Thereafter, the slide base feed motor 19 is rotated by the command from the motor control device 30, and only the corner 13 is rotated.
When the count number of the corner only center current position buffer 34 matches the count number of the column center position buffer 31, the rotation stops, and the corner only center position 13 is moved to the column center position of the wood 1. Move to heart position and stop. Similarly, when the fixing vise 4 is at the chain line position, the corner chisel 13 moves to the center position of the lumber 1 and stops.

In the embodiment of the present invention, a magnet is used as the target means for the base position detection target 9 and the moving vice position detection target 10, and a magnetic sensing element such as a Hall element is used as the detection means for the target detector 21. For example, the same effect can be achieved by using an optical sensor as the detection means of the target detector 21 and using marks or the like that can distinguish between brightness and darkness as the target means for the base position detection target 9 and the moving vice position detection target 10. . The same applies to the position detecting means of the locking/fixing position detector.

The rotational speed of the measuring device 22 is detected by a squared disc fixed to the motor shaft and a photointerrupter, but a combination of a magnet and a Hall element may also be used. Further, instead of measuring the rotation angle of the motor shaft, the amount of movement of the target detector 21 may be measured using another linear encoder, linear scale, or the like.

As described above, according to the present invention, it is possible to automatically detect the position of the column center of wood, and it is possible to improve the efficiency of square hole drilling work. Furthermore, since a mechanism for measuring the distance between the base and the moving vise is used as a means for detecting the position of the center of the timber column, the structure is simple and the increase in weight due to the addition of this function can be minimized. Furthermore, the position detection mechanism has the characteristics of high accuracy and high practicality.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional plan view showing an example of a column center position detection mechanism of an electric angle chisel embodying the present invention;
The figure is a sectional view taken along line C-C' in Fig. 1, Fig. 3 is an enlarged sectional view of main parts of the base position detection target and target detector according to the present invention, and Fig. 4 shows the center of only the corner using the present invention. A block circuit diagram for guiding the wood to the center of the width of the wood to be processed. FIG. 5 is a timing chart schematically showing the signal output state of each part of the block circuit diagram of FIG. 4. 1 is the wood to be processed, 2 is the base, 3 is the moving vise, 4 is the fixed vise, 8 is the main body, 9 is the base position detection target, 10 is the moving vise position detection target, 1
3 is a corner only, 14 is a slide frame, 21 is a target detector, 22 is a measuring device, 23 is a corner only, and 28 is a computing unit.

Claims (1)

[Claims] 1. A base to be placed on the wood to be processed, a fixing vise that is locked and fixed to one side of the base in the width direction of the wood, and a fixing vise that is fixed in the width direction of the wood on the other side of the base opposite to the fixing vise. a moving vise movably supported by the base; a slide frame movably supported by the base so as to be movable at least in the width direction of the wood; a main body part movably supported by a column upright on the slide frame; Only the corner attached to the lower end of the main body and housing a rotary cone inside, a base position detection target provided on the movable vice side of the base, a movable vice position detection target provided on the movable vice, and the base a distance detection device for detecting a distance between a position detection target and a movable vise position detection target, a distance detected by the distance detection device and a distance from the base position detection target to an end surface of the fixed vise side of the wood; A column center position detection mechanism in an electrical angle chisel, characterized in that it is provided with a computing unit that calculates the distance from the base position detection target to the widthwise center of the wood based on the base position detection target.