JPH11114913A - Safety apparatus for wood cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety apparatus for a wood cutting machine which protects an operator from touching rotating saw teeth perfectly irrespective of the thickness dimensions of a material to be cut. SOLUTION: An apparatus to be mounted on a machine equipped with a round saw which reciprocates between both ends of a slit formed in a cutting board with part of the saw teeth projected from the slit is equipped with a rotary shaft 1 of a prescribed length which is separate from the slit 54 at a prescribed distance and arranged in parallel to the slit, a rotation means 3 for rotating the shaft 1 in the normal and reverse directions, a means 4 for changing over the rotation direction, and a cover member 2 which is engaged with the shaft 1 over its whole length and has a shape to cover the projected saw teeth and a deformation restoring property. The cover member 2, freely slidably around the shaft 1, is preferably composed of cover units 2a engaged with each other in a continuous state. The change-over means is preferably interlocked with the clamp mechanism of the material to be processed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular cutter which reciprocates between both ends of a slit in a state in which a part of a saw tooth protrudes from a slit provided substantially over the entire length of a cutting machine for fixing a workpiece. The present invention relates to a safety device for a wood cutting machine that can completely prevent a worker from touching a rotating saw tooth by assembling with a saw.

[0002]

2. Description of the Related Art As a conventional work safety measure of a wood cutting machine of the above-mentioned type, which is called "panel saw" in the industry, as a conventional work safety measure, a work material is pressed and fixed to a vertically arranged cutting machine. Attempts have been made to attach a safety cover to the clamping mechanism to cover the saw teeth.

[0003]

However, as the thickness of the workpiece increases, the safety cover attached to the clamp mechanism is located above the entire height of the clamp mechanism where the workpiece is not applied. And the gap width between the cutting board and the cutting board gradually increases. For this reason, the possibility that the worker inadvertently inserts his hand into the gap formed between the cutting board and the upper part of the cover and touches the saw blade during high-speed rotation is extremely high when the worker is in a hurry.

Accordingly, an object of the present invention is to provide a "panel saw"
For wood cutting machines, which are used by attaching to the type called `` Shoes '' to ensure that workers do not inadvertently touch the rotating saw blade regardless of the thickness of the workpiece. To provide a safety device.

[0005]

In order to achieve the above object, a safety device for a wood cutting machine according to the present invention comprises a cutting machine 53 for fixing a workpiece by a clamp mechanism 70.
A circular saw 60 having a part of a saw tooth protruding from the slit 54 is attached to a processing machine configured to reciprocate between both ends of the slit 54. A rotating shaft 1 having a predetermined length disposed in parallel with the slit 54 at a predetermined distance from the rotating shaft 54, a rotating means 3 for rotating the rotating shaft 1 in forward and reverse directions, and It is characterized in that it comprises a switching means 4 and a cover member 2 which is fitted over substantially the entire length of the rotary shaft 1 and has a shape capable of covering the protruding sawtooth and a deformation restoring property. The cover member 2 may be configured to include a group of a plurality of cover units 2a slidably fitted around the rotation shaft 1 so as to be connected to each other. Further, the switching means 4 may be operated so as to rotate the cover member 2 to the side where the saw teeth are covered and the side where the covering is released, in conjunction with the clamping and releasing operations of the clamping mechanism 70.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state where the safety device A of the present invention is mounted on a panel saw B. A roller conveyor 52 on which a workpiece (hereinafter, referred to as a workpiece W) is placed in a vertical direction is provided at a lower portion of a front surface of the vertical base frame 51 of the panel saw B, and a workpiece W is disposed above the roller conveyor 52. A panel-shaped cutting board 53 that is abutted against the panel is tilted slightly backward and attached.

In the middle of the cutting board 53 in the left-right direction,
As shown in FIG. 3, a part of the sawtooth of the circular saw 60 is
A slit 54 for projecting to the front surface of is provided over the entire height. Although not shown, a guide rail, a drive mechanism, and the like for reciprocating the circular saw 60 up and down along the slit 54 are attached to the back of the cutting board 53, similarly to the existing panel saw.

On the front surface of the slit 54, a known clamping mechanism 7 for pressing the work W against the cutting board 53 to fix it.
0 is attached. The configuration is such that a bar-shaped abutting member 72 for pressing the work W is provided inside a vertical frame 71 laid between upper and lower ends of the base frame 51 via a pair of upper and lower fastening levers 73, 73. Assembled. The two fastening levers 73 allow the reciprocating motion of the air cylinder 74 to be transmitted via the interlocking rod 75, and
Is brought into contact with and separated from the work W applied to the cutting board 53.

Next, the structure of the safety device A will be described with reference to FIGS. The general configuration of the safety device A is as follows. A rotary shaft 1 arranged in parallel with the slit 54 at a front portion at a predetermined distance from the slit 54, and a cutting machine 53.
A cover member 2 fitted on the rotating shaft 1 to cover the saw teeth protruding from the front surface of the rotating shaft 1, an air actuator 3 serving as rotating means for rotating the rotating shaft 1 in forward and reverse directions, An electromagnetic air switching valve 4 is provided as switching means. In this embodiment, as shown in FIG.
Are mounted on the left and right sides of the clamp mechanism 70, respectively. Reference numeral 80 in the figure denotes an operation panel of the panel saw B.

As shown in FIG. 3, the lower end of the rotary shaft 1 shorter than the longitudinal frame 71 is loosely fitted in the shaft hole 5a of the lower bracket 5 attached to the frame of the roller conveyor 52, The part is loosely fitted in the shaft hole 6a of the upper bracket 6 attached to the longitudinal member 71. An air actuator 3 is mounted on the lower surface of the lower bracket 5 as a rotating means of the rotating shaft 1, and the rotating shaft, which cannot be seen in the drawing, is connected to the lower end of the rotating shaft 1.

As shown in FIG. 4, the cover member 2 is made of a strip material having a predetermined length, and a large number of cover units 2a each having a base portion on one side branched into two branches. It has an articulated form. A circular arc surface a for holding the rotating shaft 1 elastically in a sliding state (shaft fitting) is provided inside each of the distal ends of the forked portions.

Next, the operation of the above configuration will be described mainly with reference to FIGS.
4 will be described. The electromagnetic air switching valve 4 rotates the rotating shaft 1 in the forward and reverse directions in order to rotate the cover member 2 to the side for covering the saw tooth and the side for releasing the cover in conjunction with the clamping and releasing operation of the clamping mechanism 70. It is configured to switch and rotate. When the saw blade of the circular saw 60 returns to the original position after finishing the cutting operation, the cutting board 53
Is to be withdrawn from the board.

Therefore, when the work W is set at a predetermined position on the front surface of the cutting board 53 as shown in FIG. 1 with the circular saw 60 raised along the slit 54, the cover member 2 The cutting board 53 is always turned away from the board surface of the cutting board table 53, for example, to the position shown in FIG. Therefore, the cover member 2 does not hinder the work of setting the work W. Note that the work W in this case is a stack of a plurality of plywoods, and the height of the cover member 2 is
Is set to be higher than that of.

After the above setting operation is completed, when the clamp mechanism 70 is operated to the clamp side by the operation panel 80, the electromagnetic air switching valve 4 is operated in conjunction therewith, and the cover member 2 is turned in the opposite direction. The blade is turned on its own side to cover the saw teeth.

For this reason, as shown in FIG. 3, among the cover units 2a group rotated together with the rotary shaft 1, the work W
Each of the cover units 2a located opposite to the work W
The rotation is stopped by abutting on, and remains at this position. Then, the cover unit 2a group located above the rotation-stopped cover unit 2a group continues to rotate further, and the rotation is stopped only when it comes into contact with the cutting board 53.

In this case, the dangerous saw tooth which is rotating at a high speed while projecting from the front surface of the cutting table 53 can be inserted by the cover member 2 as shown in FIG. It will be covered up with no room for entry. still,
The cover member 2 is provided to a height position where the worker during the cutting operation may reach out.

Even after the cutting of the work W, unless the circular saw 60 is raised to the upper end of the cover member 2 or the rotation of the circular saw 60 is not stopped, the cover member 2 covers the rotating teeth. It is held in a pivot position. When the clamp mechanism 70 is operated to the clamp release side by the operation panel 80 after the cutting, the cover member 2 is rotated from the self to the side for releasing the saw tooth covering, and one cycle of the cutting operation is completed. I do.

In the above configuration, the object of the present invention is achieved by appropriately changing the design of the detailed structure. For example, an electric motor may be used instead of the air actuator 3 as the rotation unit.

The shape of the cover member 2 is not limited to the illustrated one, but may be appropriately changed according to the form and structure of the work W, the clamp mechanism 70 and the like. More specifically, the cover member 2 is formed by forming a fitting portion of the rotating shaft 1 on an elastic plastic or rubber strip, or by forming a comb-like cut on the strip. You may.

[0020]

As is apparent from the above description, the safety device for a wood cutting machine according to the present invention has the following practically excellent effects. (A) Even if the length or thickness of the workpiece changes, it can reliably cover the rotating saw tooth without the need to adjust the safety device. (B) By linking the operation of covering and uncovering the saw tooth by the cover member with the movement of the clamp mechanism, the efficiency of the cutting operation can be greatly improved while ensuring safety. (C) It can be easily attached to an existing panel saw.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, in which a safety device is attached to a panel saw.

FIG. 2 is a front view of an essential part of FIG. 1;

FIG. 3 is a perspective view for explaining the operation of the safety device.

FIG. 4 is a perspective view showing a configuration of a cover member according to the first embodiment.

[Explanation of symbols]

 Reference Signs List A safety device B panel saw 1 rotating shaft 2 cover member 2a cover unit a clamping arc surface 3 air actuator (rotating means) 4 electromagnetic air switching valve (switching means) 51 base frame 52 roller conveyor 53 cutting board 54 slit 60 circular saw Reference Signs List 70 Clamp mechanism 71 Vertical frame 72 Contact member 73 Press lever 74 Air cylinder 75 Interlocking rod 80 Operation panel

Claims (3)

[Claims] A slit 54 is provided in a cutting board 53 for fixing a workpiece by a clamp mechanism 70, and a circular saw 60 having a part of saw teeth protruding from the slit 54 is reciprocated between both ends of the slit 54. A device for attaching to a processing machine configured as described above, wherein the slit 5 is separated from the slit 54 by a predetermined distance.
A rotating shaft 1 having a predetermined length disposed in parallel with the rotating shaft 4, a rotating unit 3 for rotating the rotating shaft 1 in forward and reverse directions, and a rotating direction switching unit 4; A cover member 2 which is fitted over substantially the entire length and has a shape capable of covering the protruding sawtooth and a deformation restoring property
A safety device for a wood cutting machine, comprising: 2. The cover member 2 comprises a group of a plurality of cover units 2a which are slidably fitted around the axis of the rotary shaft 1 so as to be connected to each other. Safety device for the described wood cutting machine. 3. The switching means 4 includes:
The wood cutting process according to claim 1 or 2, wherein the cover member (2) is operated so as to rotate to the side for covering the saw tooth and the side for releasing the cover in conjunction with the clamp (0) and the clamp release operation. Safety device for the machine.