JP2000071201A - Marking gauge cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marking gauge cutting device which is free from the operating failure of a detection means and is capable of efficiently performing a cutting work through smooth reciprocal motion. SOLUTION: A circular saw 16 is made to travel back and forth with a work W and is allowed to cut into the work W shallowly in its normal travel process and makes a deep cut into the wood W in its reverse travel process to cut the entire thickness of the wood W. The circular saw 16 is driven to rotate by an electric motor 11 and at the same time, is set at a low level of load current value during idling and at a high level of load current value during cutting with the help of a detection means C which detects these levels. With the installation of this means C on the device, the circular saw 16 is rotated normally and reversely under control for its return travel motion upon an output signal from the detection means C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hair pulling and cutting apparatus which cuts a workpiece without causing chipping.

[0002]

2. Description of the Related Art In a work material having a hard decorative layer on both front and back surfaces, a hair-cutting process is performed to prevent chipping. When performing the above-mentioned cutting using a single circular saw, the circular saw is reciprocatingly moved and traveled, and in the forward stroke, the cutting material is cut shallowly to cut the decorative layer on one side,
Next, the circular saw is deeply cut in the return stroke, and the decorative layer on one side remaining together with the entire thickness is cut.

[0003] As a circular sawing machine for performing such a cutting process, there has heretofore been known a Japanese Patent Publication No. 61-21, which is proposed by the present applicant.
The invention of No. 121 is known. In the present invention, in order to improve the working efficiency in the cutting process, the end of the workpiece is detected in the cutting direction by a sensor, and the reversal timing of the reciprocation of the circle is controlled by the detection signal.

According to this conventional processing machine, a reciprocating stroke of a circle in accordance with the length of a work material can be obtained. As a result, a waste time can be reduced, and the efficiency of the processing operation can be greatly improved. Was achieved.

[0005]

In a conventional processing machine, an optical detection switch is mounted on a saw table having a circular saw, and a work material is detected through a narrow slit for running the saw. However, as is well known, there is a problem that the processing dust is scattered and adhered to the vicinity of the saw table, and furthermore, the vibration is intense.

In addition, since a strict configuration is required for mounting the detection switch, there is a problem that the manufacturing cost increases, and an improvement measure has been required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and a hair pulling and cutting apparatus which can always perform a cutting process with an appropriate reciprocating stroke regardless of an installation environment or the like. It is something to offer.

In order to achieve the above object, the hair pulling and cutting apparatus according to the present invention is configured as follows.

[0009]

That is, the gist of the invention is that a circular saw is reciprocatedly moved with respect to a work material, and the circular saw cuts into the work material shallowly in the forward movement stroke. In a circular saw processing machine in which a circular saw is largely cut in a moving stroke to cut the entire thickness of a processing material, an electric motor that rotationally drives the circular saw is provided,
Detecting means for detecting the load current of the electric motor, comparing the detected value and outputting the detected value, and controlling the forward / reverse rotation of the traveling driving means for reciprocatingly traveling the circular saw by the output signal of the detecting means. is there.

[0010] Compared to the load current value of the electric motor during non-cutting processing (during idle operation), a larger load current value is detected during cutting processing. Therefore, the end of the workpiece can be confirmed by the change in the current value. When the termination is confirmed, the electric motor of the traveling drive means is switched in the forward or reverse direction by the output signal of the detection switch. This makes it possible to appropriately change the traveling direction of the circular saw.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a hair pulling and cutting apparatus according to the present invention will be described. FIG. 1 shows a side view of a vertical circular saw cutting machine to which this apparatus is applied, 1 is a frame of the machine, 2 is a substantially vertical table provided on a front portion of the frame 1, and 3 is provided at a lower portion of the table 2. The horizontal ruler plate 4 is a vertical guide rail held on the frame 1 on the back side of the table 2.

Reference numeral 5 denotes a saw drive A which is disposed on the guide rail 4 so as to be capable of running (moving up and down), and is a drive means for driving the saw drive 5 up and down. A pair of sprockets 6 and 7 disposed at the upper and lower ends, a chain 8 whose ends are connected to the saw base 5 and stretched over both sprockets 6 and 7, and a lower sprocket 8
And a reversible electric motor 9 linked to the motor through a speed reducer.

B shows a cutting unit mounted on the saw base 5, and this cutting unit is, as shown in FIG.
Motor 11 mounted horizontally on saw base 5, bearing cylinder 13 and bearing cylinder 1 slidably provided by arm 12
3 comprises a circular saw 16 mounted on a spindle 14 via a flange 15. The above circular saw 16
Pulley 17 of rotary shaft 10 and pulley 18 of spindle 14
The belt 19 is rotated at a high speed in a predetermined direction by a belt 19 stretched over the belt.

The electric motor 11 of the cutting unit B is provided with detecting means C for detecting the load current value, outputting the load current at the time of idling at a low level, and outputting the load current at the time of cutting at a high level. The detection means C is provided in an electric control circuit (not shown), and the detection signal
The rotation of the electric motor 9 is controlled in the forward and reverse directions.

D is a notch setting means for setting the amount of protrusion of the circular saw 16 from the table 2 surface.
It comprises a pneumatic cylinder 20 provided between the saw base 5 and the arm 12, and the circular saw 16 protrudes largely from the surface of the table 2 when the piston rod 21 extends, and protrudes slightly when the piston rod 21 contracts. The circular saw 16 protrudes through the traveling slit 22 of the table 2.

E is a clamp means for pressing and fixing the workpiece W on the horizontal ruler plate 3 to the table 2 surface.
Is constituted by a mounting frame 23 disposed on the front side corresponding to the table 2, a pressing bar 25 provided on the mounting frame 23 via a parallel link 24, and an operating pneumatic cylinder 26 connected to the parallel link 24.

The configuration of the circular saw cutting machine according to one embodiment is as described above, and the hair sawing and cutting process is performed as follows. In the first setting state, the description will proceed assuming that the saw table 5 is at the lower end in the elevating direction and the circular saw 16 is at the immersion position shown by the solid line in FIG.

In carrying out the work, first, the work material W is supplied onto the horizontal ruler plate 3, and is appropriately moved laterally to determine the cutting position. Then, the clamping means E is operated to press and fix the table 2. Since the lower end of the workpiece W is on the horizontal ruler plate 3, the starting point of the cutting process is always at a fixed position. When the setting of the processing material W is completed, a processing start switch (not shown) is operated to move to the next step.

The output signal of the switch is supplied to the electric motor 11 of the cutting unit B via an electric control circuit (not shown).
And the circular saw 16 is driven to rotate. In addition, the pneumatic cylinder 20 of the cut setting means D holds the circular saw 16 at a position slightly protruding from the table 2.

As described above, the circular saw 16 is located at a position protruding from the table 2, but is merely idling because it is at a immersion position below the horizontal ruler plate 3. When the above operation is completed, the electric motor 9 of the traveling drive unit A is driven to rotate in the forward direction by the electric sequence control operation, whereby the saw table 5 moves upward.

With the upward movement of the saw base 5, the circular saw 16 appears on the horizontal ruler plate 3, and the cutting of the workpiece W is started. In the above immersion position, the load current value of the electric motor 11 is low, and the detection signal is at a low level.
At the cutting position, the load current value is high and the detection signal is at a high level. When the detection signal is at the high level, the electric motor 9 continues the forward rotation drive.

As the circular saw 16 moves upward, the workpiece W
Is cut to its upper end, and when it passes therethrough, the circular saw 16 becomes idle, the load current value decreases,
The detection signal goes low. This output signal causes the electric motor 9 of the traveling drive means A to switch in the reverse direction,
The pneumatic cylinder 20 of the cut setting means D is a circular saw 16.
It operates in the position where it protrudes greatly.

Since the saw table 5 switches the running direction in the descending direction by the above operation, the workpiece W is cut by the circular saw 16 in the full thickness. The detection signal based on the load current value of the electric motor 11 is switched from a low level to a high level. Then, while at the high level, the electric motor 11 is driven to rotate in the reverse direction, and the cutting of the workpiece W is continued.

By the downward movement of the circular saw 16, the workpiece W
Is completed, the load current value of the electric motor 11 becomes small, and the detection signal becomes low level.
By this signal, the drive motor 9 of the traveling drive means A stops rotating and the pneumatic cylinder 20 of the cut setting means D
Sets the circular saw 16 to a small protruding position.

With the above, one hair-cutting process by the reciprocating movement of the circular saw 16 is completed, and the circular saw 16 is acted on each of the decorative layers on the front and back surfaces of the processing material W. Good processing without chipping can be performed.

After the processing is completed, the pressing and fixing by the clamping means E is released, and the workpiece W is taken out of the table 2. When further cutting is to be performed, the remaining material is laterally moved and set at a predetermined position, and the processing operation is performed as described above.

In one embodiment, the hair pulling and cutting apparatus of the present invention has been described as applied to a vertical circular saw cutting machine. However, a horizontal table which has a horizontal table and in which the circular saw travels in the same horizontal direction is described. It can be applied without exception to circular saw machines.

In the circular saw cutting machine of one embodiment, the circular saw is located on the back side of the table, and is projected to the front side to adjust the position. The same applies to circular saws of the type which is on the side and which is positioned on the front side.

[0029]

As described above, in the hair pulling and cutting apparatus according to the present invention, the end position of the workpiece is detected by the change in the load current value of the electric motor. For this reason, the conventional disadvantage using the optical detection switch can be solved, and an excellent effect that the cutting can be performed smoothly can be exhibited.

[Brief description of the drawings]

FIG. 1 is a side view of a vertical circular saw cutting machine to which a hair pulling and cutting apparatus according to the present invention is applied.

FIG. 2 is an explanatory view showing a configuration of a cutting unit.

FIG. 3 is an explanatory view showing the point of the hair pulling and cutting process.

[Explanation of symbols]

 Reference Signs List A traveling driving means B cutting unit C detecting means D cutting setting means 2 table 3 horizontal ruler plate 5 saw table 9 reversible electric motor 11 electric motor 16 circular saw 20 pneumatic cylinder 22 traveling slit

Claims (1)

[Claims] 1. A circular saw is reciprocatedly moved with respect to a work material, and the circular saw cuts into the work material shallowly in the forward movement stroke, and the circular saw greatly cuts in the return movement stroke. In a circular saw processing machine configured to cut the entire thickness, an electric motor that rotationally drives the circular saw is provided, and a detection unit that detects a load current of the electric motor, compares the detected value, and outputs the result. A hair cutting and cutting device for performing forward / reverse rotation control of a traveling driving means for reciprocatingly moving a circular saw in accordance with an output signal of the detecting means.