JPH06238601A - Band saw machine - Google Patents

Abstract

PURPOSE:To enable unmanned automatic operation by providing a safety device wherein backward feed of fractions of timber moving with a carriage is automatically detected and the running of the carriage and rotation of a band saw are stopped urgently. CONSTITUTION:A guard rod 21 is provided nearly in parallel with a rear back part of a timber cutting part of a band saw 5. The guard rod is supported so as to go up and down in a reciprocating way in between the highest position where the top of the rod protrudes upward from a carriage 1 and the lowest position decided to be at a part lower than the deck of the carriage 1. The guard rod 21 is raised and lowered synchronizing with the running of the carriage 1 and retracted to the lowest position during the reciprocating process (sawing process) of the carriage 1. A lifting device consisting of a pneumatic cylinder 31 being kept at its highest position during the returning process and of a rod 32 is provided. Also, there is provided a safety device 9 consisting of a device 41 for detecting external force when the guard rod 21 receives unexpected external force during the returning process of the carriage 1 and of a device for urgently stopping the band saw 5 in response to an external force detection signal from the external force detecting device 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band saw machine, and more particularly to a band saw machine provided with a novel safety device.

[0002]

2. Description of the Related Art A band saw machine is a sawing machine that grinds square timbers and plates from logs or thick squares. In this band saw machine, lumber is carried out by reciprocating a feeding vehicle having a log attached thereto, toward a band saw which is wound around a pair of saw wheels and rotates.

This device comprises a conveyor provided for carrying out the material cut out by the band saw, a moving end position on the forward side of the material feeding vehicle and a conveyor for placing the cut out material on the compare. And a shooter provided therebetween. That is, the plate material or end material ground by the band saw falls on the shooter, slides on the shooter, falls on the belt conveyor, and is carried out.

However, even if the plate material is anyway, in the case of the end material, its shape and properties are various, and there are extremely strong bends, long stripped bark connected to the log, very short one, There are things that are extremely unbalanced, and some of these things do not smoothly fall onto the shooter, pierce into the gap between the feeder car and the raw wood, and are sent back to the band saw by the feeder car. There is something.

Then, the scrap material collides with the rear part of the band saw, but since no stopper is provided on the blade side of the band saw, the band saw will come off the saw wheel when pushed from the back part. This is a very dangerous situation and causes serious injury.

For this reason, the conventional band saw machine constantly monitors the operating condition of the machine, and immediately stops the band saw machine immediately when the scrap material is caught in the material feeding vehicle and is likely to be fed back as described above. , Requires a driver, which made unmanned operation impossible. However, this work is extremely tedious and involves considerable risk.

In order to ensure such monitoring and ensure emergency stop, the worker confirms that there is no danger as described above, and then restores the feeding vehicle. Since it is necessary to move the feeding vehicle, it is not possible to automatically start the backward movement of the material-feeding vehicle, which inevitably reduces the operating efficiency of the device.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and when an end material is fed backward together with a material feeding vehicle, it is automatically and reliably detected and the material feeding is carried out. Equipped with a safety device that can emergency stop the running of the car and the rotation of the band saw,
It is to provide a band saw machine capable of unmanned automatic operation.

[0009]

SUMMARY OF THE INVENTION The above object is to provide a conventionally known band saw machine, which is provided substantially parallel to a rear part of a material cutting portion of a band saw, and whose top is above a deck of a material feeding vehicle. So that it can reciprocate up and down between the highest position protruding to the lowest position and the lowest position defined below the deck of the feeding vehicle, and when an external force is applied, within a minute range parallel to the traveling direction of the feeding vehicle. During the forward movement process of the feeding vehicle (during the cutting process), the protective rod supported so that it can be displaced and the protective rod are moved up and down in synchronization with the traveling of the feeding vehicle.
Is an elevating device that retracts to the lowest position and holds it at the highest position during the returning process, and a device that can detect the external force when the protective rod receives an unexpected external force during the returning process of the material feeding vehicle. , A device for responding to an external force detection signal from the external force detection device and for making an emergency stop of the band saw machine.

In a preferred embodiment, the protective rod is provided so as to pass through a mounting hole provided at one corner of the shooter in the vicinity of the band saw, and a supporting device provided on a machine base common to the saw wheel and the shooter. Via a pneumatic cylinder provided parallel to the guard rod and supported by the stopper so that it can rotate within a restricted angular range, and when it is at the highest position, the shooter It is configured so as to project from the upper surface of the above to reach above the raw wood on the feeding vehicle, and to retreat to the lower side of the shooter at the lowest position.

Although the present invention is effective for a single band saw, it is particularly recommended to apply it to a twin band saw. The reason for this is that twin band saws have a higher incidence of accidents involving mill ends and are more damaged by the accidents.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. 1 is a plan view showing an arrangement of main mechanical parts of a twin band saw equipped with a safety device according to the present invention, FIG. 2 is a partially cutaway front view showing the configuration of the safety device, and FIG. 3 is a partially cutaway side view thereof. Is.

FIG. 1 shows a twin band saw, which is usually used for sawing off timber and the like. In this device, the main constituent elements are arranged symmetrically with respect to the center plane of the feeding vehicle in the traveling direction. Has been done.

In the figure, 1 is a material feeding vehicle, 2 is a material feeding vehicle 1.
Logs 3, 3 attached to the traveling track of the feeding vehicle 1,
4 and 4 are saw wheels (both of which are provided as a pair in the vertical direction, but only the upper one is shown here). 5 and 5 are wound around the saw wheels 4 and 4. Band saw,
6 and 6 are shooters, 7 and 7 are belt conveyors for carrying out, 8 and 8 are ground end materials, and 9 and 9 are safety devices.

The material feeding vehicle 1 has a pair of clamps 1-1 and 1-2 on its center reference plane, and the pair of clamps 1-
The raw wood 2 supplied from a publicly known raw wood supply device (not shown) is held between 1 and 1-2, and along the tracks 3 and 3 by a motor (not shown) or the like in the left-right direction (X axis). Direction).

As described above, the saw wheels 4 and 4 are also provided on the lower sides of those shown in the drawings, and are rotatably supported by a machine base (not shown). A band saw 5 is wound between the wheels 4 and rotated in the direction of the arrow in the figure by a motor (not shown).

The machine base for supporting the saw wheels 4 and 4 is mounted on a bed (not shown) so as to be movable in the Y-axis direction perpendicular to the traveling direction of the material-feeding vehicle 1, that is, the X-axis direction. By this movement in the Y-axis direction, walking is performed.

The belt conveyors 7, 7 are at a position much lower than the deck of the material feeding vehicle 1, and the shooters 6, 6 are inclined downward from the upper surface of the deck of the material feeding vehicle 1 onto the belt conveyors 7, 7. The log 2 is supplied by a known device (not shown).
After centering, a clamp 1-provided on the material feeding car 1 is also provided by a well-known loading robot arm.
It is attached between 1, 1-2.

When the material feeding wheel 1 advances toward the saw wheels 4 and 4 in the right direction in FIG. 1, it is a forward movement step in which the material is cut out, and the pair of band saws 5 and 5 are used to move the raw wood 2 The two sides of the wood are ground, and the end materials 8 and 8 are ground from both side surfaces of the log 2. This ground sawdust 8,8
Are dropped onto the shooters 6 and 6, respectively, slide on the shooters 6 and 6, are placed on the belt conveyors 7 and, and are carried out to the right in the figure.

When the forward movement process is completed, the backward movement process is started, and the material feeding vehicle 1 travels leftward in the figure and returns to the position shown in the figure again. Then, when this returning process is completed, the clamps 1-1 and 1-2 move 90 degrees around their central axes.
The original wood 2 is rotated by 90 degrees. At that time, the material feeding vehicle 1 is driven rightward again, the remaining two surfaces are ground, and the log 2 becomes a square material.

There is no problem if the scrap materials 8 are smoothly placed on the belt conveyors 7 and carried out as described above.
The shapes of the scrap materials 8 and 8 vary widely. That is, some of these end pieces bend strongly when cut out, wind up and roll up, have long bark dragging, and have a significantly unbalanced shape, so that they cannot be smoothly placed on the shooters 6 and 6. There is a vehicle that returns to the band saw direction together with the feeding vehicle 1 that moves back by getting into or getting caught in a gap between various devices of the vehicle 1.

Thus, such a scrap material collides with the rear part of the material cutting portion of the band saws 5, 5 (the one without the cutting edge). The band saws 5 and 5 do not come off from the saw wheels 4 and 4 even if a strong external force is exerted from the cutting edge, but they are easily separated from the saw wheels 4 and 4 when pushed from the rear part. To do.

Since the band saws 5 and 5 rotate at high speed, it is very dangerous if they are accidentally disengaged from the saw wheels 4 and 4,
Immediately leading to serious injury. for that reason,
In the present invention, the following safety devices 9, 9 are provided in the vicinity of the back of the material cutting portion of the band saws 5, 5.

The structure of the safety devices 9 and 9 will be described below with reference to FIGS. The apparatus shown in FIG. 2 and FIG.
Is provided on one side of the feeding vehicle track, and another one is provided on the other side.

In the figure, 10 is a machine base common to the saw wheel 4 and the shooter 6, 11 is a bracket provided on the machine base 12, and 12 is a bracket 11 which rotates via bearing bushes 13 and 14. A rotatable rotary shaft with a flange 15 is a substrate mounted on a flange 12a provided at one end of the rotary shaft 12.

As described above, the safety device according to the present invention is provided on the machine base 10 common to the saw wheel 4 and the shooter 6, so that the safety device 9 moves together with the band saw 5 and the shooter 6 at the time of stepping. This is because it is convenient.

The board 15 has eye bracket portions 15a and 15b at its upper and lower ends, respectively, and a protective rod 21 is supported substantially vertically and vertically movable in the mounting holes provided in the eye bracket portions 15a and 15b. ing. In addition, 22 and 23 are bearing bushes inserted between the protective rod 21 and the mounting hole of the eye bracket portion.

A cylinder mounting substrate 24 is attached to the substrate 15, and the cylinder mounting substrate 24 is attached.
A pneumatic cylinder 31 is attached to the bracket via brackets 25 and 26.

The pneumatic cylinder 31 is mounted parallel to the protective rod 21, and the tip of the rod 32 thereof is connected to the lower end of the protective rod 21 by a connecting member 26.
The pneumatic cylinder 31 expands and contracts in synchronism with the reciprocating traveling of the material feeding vehicle 1, raises and lowers the protective rod 21, and causes the upper end of the protective rod 21 to project from and retract through a through hole provided in the shooter 6.

Further, the movable piece 4 of the stopper is provided on the substrate 15.
1 is attached, and a pair of fixed pieces 42 and 4 are provided so as to sandwich the movable piece 41 in the movable direction of the movable piece 41.
3 is provided.

The pair of fixed pieces 42 and 43 are fixed to a fixed portion of a machine base (not shown) so as to sandwich the movable piece 41 with a minute gap therebetween. Therefore, the movable range of the movable piece 41 is fixed. Is restricted to very small distances.

The fixing piece 42 is provided on the raw wood supply side, and the fixing piece 4 is provided.
3 is provided on the material unloading side. On the other hand, a swing arm 51 is fixed to the free end side of the main shaft 12, and the rotation of the swing arm 51 is detected by a proximity relay 52.

The bracket 11 and the swing arm 51 are provided with spring mounting pins 43 and 44, respectively, and these spring mounting pins 43 and 44 are
Both ends of the tension spring 45 are hooked, whereby the movable piece 41 of the stopper provided on the substrate 15 is pressed against the fixed piece 42 on the raw wood supply side.

As described above, the pneumatic cylinder 31 is expanded and contracted in synchronization with the traveling of the material feeding vehicle 1, and while the material feeding vehicle 1 is in the forward movement process, its rod 32 is extended and the protective rod 21 is extended.
Is pushed down to its lowest position and retracted under the shooter 6.

The protective rod 21 has a shooter 6 at its upper end.
When the protective rod 21 is at its lowest position, the swash plate 21a is flush with the shooter 6 and closes the through hole provided in the shooter 6. , Scrap material 8 cut in the forward movement process of the feeding vehicle 1
It does not hinder the sliding down of. .

Therefore, in this forward movement process, that is, in the lumber cutting process, the protective rod 21 is hidden under the shooter 6, so that the sawing is performed without any change from the conventionally known band saw machine. Thus, when the material feeding vehicle 1 moves to the backward movement process, the pneumatic cylinder 31 contracts its rod 32, and the protective rod 21
Is raised to the highest position, and the upper end portion thereof is projected above the shooter 6.

Therefore, the scrap materials 8 and 8 ground in the forward movement process immediately before that are smoothly slid down on the shooter 6 and placed on the belt conveyors 7 and 7, and if they are carried out, the backward movement process. In this case, the feeding vehicle 1 returns to the original log station without any trouble, but when any of the scrap materials 8 and 8 is caught by the feeding vehicle 1 and is sent back, The scrap material 8 is attached to the shooter 6 before contacting the back of the band saw 5.
It will collide with the protective rod 21 protruding on the upper surface of the.

Usually, these end pieces are often turned upside down at a large angle with respect to the track of the feeding vehicle, and
In such a case, the danger is particularly great. The scrap is a protective rod 21
When it strikes against the
Since it is rotatably supported within the angular range regulated by the fixed pieces 42 and 43 of the stopper and the movable piece 41, the protective rod 21 has the elastic force of the spring 45. Against the stopper, the movable piece 4 of the stopper
1 moves away from the fixed piece 43 and rotates a minute angle until it contacts the fixed piece 43.

Therefore, the main shaft 12 also rotates at the same angle at the same time, and the rotation is transmitted to the swing arm 51 and detected by the proximity relay 52. Therefore, the proximity relay 52 causes the material feeding wheel 1 and the saw wheel 4, The operation of 4 can be stopped urgently.

On the other hand, the material feeding wheel 1 and the saw wheels 4 and 4 do not stop instantly because of their large inertia, but since the protective rod 21 is extremely strong, it is entangled or pinched by the material feeding wheel 1. Since the scrap 8 sent in as a result is struck or broken by the protective rod 21, it does not come into contact with the band saws 5, 5.

In particular, when the band saw is a twin band saw as shown in the figure, the material cutting portions of the band saws 5 and 5 are protected by the pair of protective rods 21, so that the degree of safety is extremely high. Becomes

Since the present invention is constructed as described above, according to the present invention, the accident of detaching the band saw of the band saw machine due to the backward feeding of the end material is completely prevented, so that it has a remarkable effect on occupational safety. Not only that, unmanned operation of the band saw machine is possible,
It also has a great effect on the rationalization of the sawing process.

The structure of the present invention is not limited to the above-mentioned embodiment. For example, as a protective rod, a circular tube,
It may be a deformed tube, I-shaped steel, angle steel, etc., and its installation position does not hinder the protection of the band saw, and does not hinder the operation of the feeding vehicle, the cutting of the material, and the transportation. Therefore, for example, it may be between the material cutting portion of the band saw and the shooter, and in that case, the upper end thereof is slightly above the upper surface of the shooter during the forward movement process of the feeding vehicle. Further, the device for raising and lowering the protective rod is not limited to the pneumatic cylinder, and links, cams, solenoids and other known mechanisms can be adopted.
Furthermore, in the above embodiment, the protective rod is configured to be rotatable by a small angle. However, the displacement of the protective rod due to an external force is not limited to the rotation, but may be a parallel movement, or an external force may be applied. Instead of displacement, it is also possible to use a strain gauge or a piezoelectric element to detect strain associated with a collision, and the device for detecting the displacement of the protective rod is not limited to the proximity relay. Therefore, the known detection device can be widely used, and the present invention covers all the modifications.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement of main mechanical parts of a twin band saw equipped with a safety device according to the present invention.

FIG. 2 is a partially cutaway front view showing the configuration of the safety device.

3 is a partially cutaway side view of the safety device shown in FIG.

[Explanation of symbols]

1 ... Feeding vehicle 2 ... Log 3 ... Trajectory of feeding vehicle 4 ... Saw wheel 5 ... Band saw 6 ... Shooter 7 ... Belt Conveyor 8 ··· Grinded end material 9 ··· Safety device 10 ··· Common machine stand to which saw wheel, shooter and safety device 11 ··· Bracket 12 · · · Spindle 15 ... ・ Substrate 21 ・ ・ ・ ・ ・ ・ Protection rod 31 ・ ・ ・ ・ Pneumatic cylinder 32 ・ ・ ・ ・ Rod 41 ・ ・ ・ ・ Movable piece of stopper 42 ・ ・ ・ ・ ・ ・ Fixed piece of stopper 43 ・ ・ ・ ・Stopper fixing piece 46 ... Spring 51 ... Swing arm 52 ... Proximity relay

Claims (6)

[Claims] 1. A pair of saw wheels (4), a band saw (5) mounted on the pair of saw wheels (4) and rotating, and provided on a reference shaft provided in the traveling direction thereof so as to face each other. Has a pair of chucks (1-1, 1-2), and the pair of chucks (1-1, 1-2) support both ends of the log (2),
Tracks (3, 3) provided close to the material cutting part of the band saw (5)
A feeding vehicle (1) that reciprocates above, a drive device for the feeding vehicle (1), a conveyor (7) provided to carry out the material (8) ground by the band saw (5), and a grinding machine. A shooter (6) provided between the conveyor (7) and the moving end position on the forward side of the material feeding vehicle (1) for mounting the discharged material (8) on the compare (7). In the band saw machine, the highest position, which is provided substantially parallel to the rear part of the material cutting part of the band saw (5), the top of which protrudes above the deck of the material carrier (1), and the material carrier The protective rod (21) supported so as to be able to reciprocate up and down between the lowest position defined below the deck of (1) and the protective rod (21) in synchronization with the traveling of the material feeding vehicle (1). Ascending / descending, retracting to the lowest position during the forward movement process (during the extraction process) of the feeding vehicle (1), and holding it at its highest position during the backward movement process. Unit (31, 32), when the protective rod (21) is subjected to unexpected external force during the backward process of Okuzai vehicle (1), capable of detecting the external force device (41)
The band saw machine as described above, further comprising a safety device including: a device for urgently stopping the band saw machine in response to an external force detection signal from the external force detection device (41). 2. A device for supporting a protective rod (21) of a safety device, a bracket (11) provided on a machine base (10) common to a saw wheel (4), and a feeding vehicle by the bracket (11). The main shaft (12) is rotatably supported at right angles to the traveling direction of (1) and within a desired minute angle range around the center shaft, and the center shaft is substantially at one end of the main shaft (12). It is composed of a base plate (15) which is mounted vertically and supports the protective rod (21) so as to be able to move up and down. In order to regulate the rotation angle of the protective rod (21), the protective rod (2
There is provided a stopper composed of a movable piece (41) attached to 1) and fixed pieces (42, 43) provided on the start point side and the end point side of the forward movement process with the movable piece (41) sandwiched therebetween. A spring (45) for activating the elastic force is provided on the protective rod (21) so as to press the movable piece (41) of (21) against the end piece side fixed piece (43) of the forward movement process, and further, the protective rod (31). 2. The band saw according to claim 1, wherein the lifting device is provided in parallel with the base plate (15), and the tip of the rod (32) of the pneumatic cylinder (31) is connected to the lower end of the protective rod (21). Board. 3. A device for detecting an external force received by a protective rod (21) of a safety device comprises a swing arm (51) provided on a spindle (12) and a proximity relay () for detecting the movement of the swing arm (51). 52) and the band saw machine according to claim 1 or 2. 4. A twin band saw according to any one of claims 1 to 3.
Band saw machine according to any one of. 5. The band saw machine according to claim 4, wherein each of the pair of band saws forming the twin band saw is provided with a safety device. 6. The band saw machine according to claim 1, which is a single band saw.