JPH0462104A - Safety apparatus for circular saw machine - Google Patents

Abstract

PURPOSE:To prevent surely a sawed material from jumping out backward by providing a protector which freely stands up and falls down to the forward side and the standing angle of which is provided by means of a stopper. CONSTITUTION:A safety apparatus provides a protector 11 and a stopper 12a and the protector 11 provides a plurality of nail plates 11b and 11b fixed on the central shaft 11a. When a sawed material W is forwarded on a transferring face R of a feeding apparatus and the front end Wa is brought into contact with rear faces of front end faces of the nail plates 11b and 11b, the nail plates 11b and 11b are fallen down forward and are retreated from the transferring face R and the sawed material W passes through above the nail plates 11b and 11b. When the rear end Wb of the sawed material W finishes to pass through above the nail plates 11b and 11b, the nail plates 11b and 11b stand up by their own weight and return to their standing-up postures provided by means of the stopper 12a. If the sawed material W tends to fly out backward thereafter, the nail plates 11b and 11b prevent effectively the sawed material from flying out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention provides a circular saw that prevents sawn wood during sawing and splitting from flying out backwards by protruding a protector that can be raised and lowered from the transport surface of the sawn wood. Concerning panel safety devices.

In conventional circular saws, an accident may occur in which the sawn material that is being sawn and split suddenly flies out forward or backward. In particular, when the sawn material is conveyed toward the circular saw, when the feeding direction and the rotating direction of the circular saw are opposite to each other, the sawn material is
This is extremely dangerous as the material is thrown back into the rear of the circular saw machine, potentially resulting in personal injury to the material transport worker.

In order to prevent such accidents of sawn timber flying out, it is effective to add a safety device to the rear of the circular saw machine to prevent sawn timber from flying out. That is, it is sufficient to provide a movable protector that is retracted below the conveyance surface of the sawn materials while the sawn materials are being transported, and projects onto the conveyance surface immediately after the rear end of the sawn materials passes. In general, sawn timber flying-out accidents are most likely to occur when the rear end of the sawn timber is being sawn into pieces by a circular saw, and rarely occur when the tip or middle part of the sawn timber is being processed. It is.

Problems to be Solved by the Invention According to the prior art, the protector detects the rear end of the sawn wood through an appropriate sensor and is moved up and down by a drive source such as an air cylinder. The unavoidable problem is that operation is often unstable due to malfunctions (and it is not uncommon for vehicles to be operated with their operations intentionally stopped).

Therefore, in view of the actual state of the prior art, an object of the present invention is to make it possible to reliably prevent accidents of sawn wood flying out by causing the protector to protrude from the conveyance surface of the sawn wood by its own weight, and to improve its operation. Our objective is to provide a safety device for circular saws that is extremely reliable.

Means for Solving the Problems The structure of the present invention to achieve the above object includes a protector that has a swing center below the conveying surface of the sawn material to be supplied to the circular saw, and that can be raised and folded forward. , and a stopper that defines the upright angle of the protector, and the gist is that the protector stands up by its own weight and protrudes its tip from the conveyance surface, while falling down to a retracted position due to the sawn material being fed.

The protector may include a plurality of claw plates that are attached to a central shaft that is the center of swing, so as to be able to rise and fall, and in this case, gaps can be provided between adjacent claw plates.

Note that the stopper can be moved to the reset position to forcibly retract the protector.

Effect With this configuration, when the sawn wood is advanced along the conveyance surface and the front end of the sawn wood comes into contact with the protector, which is standing up due to its own weight, from the rear side, the protector falls to the retracted position and its tip end is retracted from the conveying surface, the sawn wood can proceed above the protector without any hindrance and can be fed to the circular saw machine.

In other words, since the protector stands up due to its own weight, its tip is pushed down by the sawn wood and maintains a retracted position while the sawn wood passes, and it stands up as soon as the rear end of the sawn wood finishes passing through. It is possible to return to the standing position and make the tip end protrude from the conveying surface. At this time, since the stand-up angle of the protector is regulated by the stopper, the sawn timber that has once passed over the protector will fly out backwards and collide with the tip of the protector from the front side. However, the protector can effectively prevent the sawn timber from flying out further to the rear.

When the protector is equipped with a plurality of claw plates, it is sufficient for the protector to take the minimum number of claw plates corresponding to the width of the sawn wood or to take a retracted position when the sawn wood is passing. Other claw plates can have their tips protruding from the conveyance surface in preparation for the flying out of the sawn timber. In addition, compared to when the claw plates are integrated as a whole, the inertial mass of each claw plate can be reduced and the swinging motion can be made faster. You can quickly return to a standing position.

Further, when a gap is provided between adjacent nail plates, the movement of the nail plates can be made even better, and the posture change of the nail plates can be made even smoother.

If the stopper can be moved to the reset position, the protector can be forcibly retracted from the conveyance surface and maintained in the retracted position, so the protector will not get in the way or be damaged during setup changes. There is nothing to do.

The safety device of the circular saw machine (hereinafter simply referred to as the safety device) is as follows:
It comprises a protector 11 and a stopper 12a (FIG. 1), and the whole is attached to the most downstream side of a supply device disposed upstream of the circular saw machine.

The feeding device includes rollers G1, G2, a cover 03, and a ruler G4 that can be moved left and right, and the sawn wood W is fed above the rollers G1, G2 and the cover 03 along the ruler G4. and can be fed to a circular saw machine. That is, the rollers Gl and G2, along with the rollers M1, caterpillars M3, M4, and M5 of the circular saw machine, are used to transport the sawn material W on the conveying surface R.
It is assumed that the

The circular saw machine has two upper and lower circular saws M7 and M8, and the plate thickness is W.
This is a twin circular saw machine that can saw and split thick sawn material W from both the front and back sides at the same time.

Circular saw M? , M8 are connected to a drive source M9 and are rotationally driven in the directions of arrows Kl and K2 in FIG. It is assumed that the material is actively fed in the direction of the force indicated by the arrow Ka in the figure. In the circular saw machine, a drive mechanism M2 for driving a ruler M6 is interposed between a roller M1 and caterpillars M3 and M4, and a ruler M6 is disposed above the drive mechanism M2. However, the ruler M6 is driven by the drive mechanism M2.
Like the ruler G4, it can be moved left and right, and the ruler G4
, M6 define the processing width of the sawn material W.

The protector 11 includes a plurality of claw plates 11b, llb, . . . attached to a central shaft 11a serving as a pivot center.

The center shaft 11a is disposed below the conveying surface R in a direction perpendicular to the direction in which the sawn material W is fed, and both left and right ends thereof are fixed to a fixed frame (not shown).

Each claw plate 11b is supported by a central shaft 11a passing through its intermediate portion so as to be able to rise and fall (FIGS. 1 and 2).

Further, the tip portion is formed into a wedge shape, and the lower half portion is formed into a rectangular shape. The claw plate 11b has a center of gravity in its lower half, and therefore, in its natural state, it stands up due to its own weight, with its lower half positioned downward and its tip protruding upward from the conveying surface R. It has become. Nail plates 11b, 11
The plate thickness of b... can be arbitrarily set, and the number of plates to be attached may be determined according to the maximum width of the sawn material W to be processed. Claw plates 11b at both left and right ends,
A fixing ring llc, llc with a lock screw 11C1 is attached to the outside of each llb, and the claw plate 11b, llb.
... is restricted from unnecessary movement in the left and right directions. It is assumed that a spacer (not shown) is interposed between the adjacent claw plates 11b and llb to form a gap, thereby smoothing the movement of each claw plate 11b.

The stopper 12a is a bar whose left and right ends are supported by arms 12b, 12b, and is disposed below and parallel to the central axis 11a. Arm 12b
, 12b are fixed to a shaft 12b1 rotatably supported by brackets G6 and G6. Also, axis 1
Another arm 12c1 is provided protruding from one end of 2b1, and the tip of the arm 12C1 is connected to a cylinder 12c whose base end is swingably connected to a bracket (G7).

However, the brackets G6, G6, and G7 are fixed to the side surface of the mounting base G5.

The stopper 12a defines the upright angle θ of each claw plate 11b by coming into contact with the lower half of the claw plates 11b, llb, . . . from the front side. That is, the stopper 12a rotates in the front-rear direction about the shaft 12b1 by expanding and contracting the cylinder 12c, and when the cylinder 12c is in the shortened position, the claw plates 11b, 111b, . . . At the reset position where the cylinder 12c is extended by an appropriate protrusion height h (solid line in FIG. 2), the claw plates 11b, llb, etc. are forcibly retracted from the transport surface R. (double-dashed line in the same figure).

Incidentally, the standing angle θ of the claw plates 11b, llb... is 90
It is best to set it somewhat smaller than °.

Now, feed the sawn material W onto the conveying surface R of the circular saw machine,
Let's consider the case of cutting this apart.

First, by extending the cylinder 12c and resetting the stopper 12a to the reset position, all the claw plates 11
b, llb... can be forcibly retracted from the conveying surface R, so the rulers G4, M6 can be
It can be adjusted to move left or right arbitrarily. After that, if the cylinder 12c is shortened, the claw plates 11b, llb...
stands up due to its own weight, and the standing angle θ at that time is defined by the stopper 12a. However, at this time,
A portion of the claw plates 11b, 11b, . . . are pushed down to the retracted position by the ruler G4 (FIG. 1).

Next, the sawn wood W is advanced on the conveyance surface R of the supply device, and when the tip Wa of the sawn wood W comes into contact with the rear surface of the tip of the claw plates 11b, llb, . . . (solid line in FIG. 3), the claw plates 11b, llb・
... can be thrown forward by the sawn timber W, evacuated from the conveyance surface R, and assume a retracted posture.

Since it is possible (double-dashed line in the same figure), the sawn wood W is attached to the claw plates 1 and L.
It is possible to pass above b, llb...

At this time, only the number of claw plates 11b, llb, . . . corresponding to the width of the sawn wood W is retracted, and the others remain in the upright position.

Subsequently, the rear end Wb of the sawn wood W is attached to the claw plates 11b, 11b,
When the claw plates 11b, llb, etc., which have been retracted, quickly stand up due to their own weight and return to the upright position defined by the stopper 12a. (Solid line in the same figure). Therefore, after that,
Even if the sawn wood W tries to jump out backwards (in the opposite direction of the arrow Ka in the figure), there are claw plates 11b, llb, etc. behind the sawn wood W.
Since ・ is standing and waiting, its jumping out can be effectively prevented.

Also, a protector 1 consisting of nail plates 11b, llb...
The first raising and lowering operation may be performed as follows. That is, the circular saw machine includes a sensor S1 that detects when the tip Wa of the sawn material W has advanced to the vicinity of the circular saws M7 and M8, and a sensor S1 that detects when the tip Wa of the sawn material W has advanced to the vicinity of the circular saws M7 and M8. A sensor S2 is provided to detect the passage (FIG. 3). When supplying the sawn material W to the circular saw machine, first, the cylinder 12c is extended and all the claw plates 11b, 11b, . . . are forcibly retracted from the conveying surface R. When the sawn material W is supplied to the circular saw machine and the tip Wa advances to the vicinity of the circular saws M7 and M8 and the sensor S1 is activated, the cylinder 12c is shortened and comes into contact with the sawn material W and the ruler G4. All the nail plates 11b, llb, . Thereafter, the rear end wb of the sawn material W passes through the positions of the circular saws M7 and M8, and the sensor S2 is activated to extend the cylinder 12C and forcibly retract the claw plates 11b, llb, . . . .

Is the sawn material W a circular saw M? , M8, the claw plates 11b, llb... are always standing up, so the sawn wood W
It is possible to reliably prevent the accident of the raw material, etc. that is generated from the machine flying backwards, and it is possible to achieve layer safety.In addition, when feeding the sawn material W to the circular saw Board 1
1b, 11b... have retreated from the conveyance surface R,
There is no possibility that the claw plates 11b, llb, . . . will interfere with the operation of supplying the sawn wood W.

Note that the sensors S1 and S2 at this time can be arranged in any manner, regardless of the arrangement shown in FIG. That is, the sensors S1 and S2 may be photoelectric sensors having optical axes in the vertical direction or the left and right horizontal directions with respect to the sawn wood W, and also have an appropriate actuation piece that the sawn wood W comes into contact with, and a It may also be combined with an actuated mechanical limit switch. Furthermore, the sensor S2 may be omitted, and the cylinder 12c may be extended after an appropriate time difference after the sensor Sl detects the rear end wb of the sawn material W. In addition, the time difference at this time is not caused by a simple timer, but by detecting that the caterpillars M3, M4, etc. have advanced a predetermined distance, and that the sawn timber W has moved forward by a predetermined distance after the sensor S1 is activated. The cylinder 12c may be extended.

In the above description, the shape of the claw plates 11b, llb, . . . is not limited to that shown in FIG. 2, but may be any other arbitrary shape such as a rectangular shape or a wedge shape. However, even in this case, it is of course necessary to satisfy various conditions such as having a center of gravity in the lower half, raising and lowering it to the front side, and the tip part being easily retracted by the sawn material W that comes into contact with it from the rear side. It is.

Instead of forming the protector 11 by a large number of claw plates 11b, llb, . . . , the protector 11 can also be formed integrally with these. At this time, although the rising and retracting operations are somewhat delayed, it is possible to more strongly prevent the sawn wood W from flying out.

The safety device according to the present invention may be installed at multiple locations in the middle of the feeding device, and it can also be installed not only in the feeding device but also in the most upstream side of the circular saw machine. The device can also be installed adjacent to the upstream side of the circular saw machine. Furthermore, this safety device can be applied to any type of circular saw, but if it is equipped with multiple circular saws, such as a double edger or multiple edger, the resistance of the circular saw against the sawn material W will be large. It is particularly effective for circular saws.

As described in detail, according to the present invention, the protector is provided with a protector that can be raised and lowered forwardly and whose upright angle is defined by a stopper. While allowing the wood to advance, it can prevent the sawn wood from jumping out backwards after passing over the protector, so the sawn wood can't fly out backwards. In addition, the protector stands up by its own weight and is directly driven by the sawn wood without using any special drive device or sensor, so there is no failure and its operation reliability is high. It has an excellent effect of being extremely high.

[Brief explanation of the drawing]

1 to 3 show an embodiment, in which FIG. 1 is a perspective explanatory view of the overall configuration, FIG. 2 is an explanatory side view corresponding to the X arrow direction in FIG. 1, and FIG. 3 is an explanatory view of the operation. W...Saw sawn material R...Conveyance surface θ...Rise angle 11...Protector 11a...Central shaft 11b...Claw plate 12a...Stopper

Claims (1)

[Claims] 1) A protector having a swing center below the conveying surface of sawn material to be supplied to a circular saw machine and capable of being raised and lowered forward, and a stopper that defines the rising angle of the protector. A safety device for a circular saw machine, characterized in that the protector stands up under its own weight and causes its tip to protrude from the conveying surface, while collapsing to a retracted position due to the sawn material being fed. 2) The safety device for a circular saw machine according to claim 1, wherein the protector includes a plurality of claw plates that are attached to a central shaft that is a center of swing and can be raised and lowered. 3) The safety device for a circular saw machine according to claim 2, wherein a gap is provided between the adjacent claw plates. 4) The safety device for a circular saw machine according to any one of claims 1 to 3, wherein the stopper moves to a reset position and forcibly retracts the protector.