JPH10100103A - Band saw machine having structure for preventing saw blade detachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a band saw machine capable of surely preventing an undesired saw detachment during cutting operation, by providing a saw detachment preventing structure. SOLUTION: A loop-shaped belt saw blade 26 is bridged between a driven pulley 25 and a driving pulley 24 each of which has a flange 27 for guiding a back portion of the belt saw blade 26, and a part of the belt saw blade 26 on one side adjacent to either the driving pulley 24 or the driven pulley 25 is used as a cutting operation zone, thus forming a band saw machine. On the other side of the belt saw blade 26 between the driving pulley 24 and the driven pulley 25, there is provided a saw blade detachment preventive mechanism 30 having a detachment preventing roller 31 facing the belt saw blade 26, so as to effectively prevent the belt saw blade 26 from slipping off a pulley.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band saw having a saw blade detachment preventing mechanism. Specifically, in a band sawing machine in which a band-shaped saw blade formed in a loop shape is bridged between a driving pulley and a driven pulley, a saw blade detachment prevention mechanism for preventing the saw blade from coming off the pulley during operation is provided. It relates to a band saw machine.

[0002]

2. Description of the Related Art As shown in FIG. 4, one example of a conventional band saw machine is a drive pulley (not shown) having a flange on one surface and a driven pulley (not shown) at both ends of an arc-shaped frame 1 having a hollow inside. A loop-shaped saw blade 2 is provided between the driving pulley and the driven pulley. One between the driving pulley and the driven pulley of the saw blade 2 is located in the frame 1 guided by a number of guide rollers, and the other is exposed to the outside to form a cutting area.

The saw blade 2 in the cutting area is angled θ by a pair of serration heads 3 and 3 ′ provided on the housing 1.
(About 45 °) twisted. The seri head has a cantilever protruding from the frame and provided with rollers for sandwiching the saw blade from the left and right. Further, the housing 1 is provided so as to be inclined so that the saw blade 2 in the cutting region is vertical, and the axes of the transport wheels 4 and 4 'are shared as fulcrums, and arrows A,
It is supported by the base 5 so that it can swing in the direction A '.
Then, the saw blade 2 is driven in the direction of arrow B by rotating the drive pulley by the drive motor 6 to cut and cut the workpiece 8 fixed to the vise 7.

In the conventional band saw, the flange 11 of the pulley 10 is provided only on one surface as shown in the sectional view of FIG. 5, and the saw blade 2 is angled by the serration heads 3 and 3 '.
Therefore, when the pulley 10 is rotated, a force is generated in the saw blade 2 in the direction deviating in the direction of arrow C, and the saw blade 2 is easily deviated. However, the saw blade 2 is tensioned by a guide roller, a spring, and the like, and is stably rotated by a frictional force F at a contact surface with the pulley 10.

However, when the frictional force F is reduced due to the adhesion of oil such as rust preventive to the saw blade 2, the saw blade 2 falls off from the pulley 10 when the frictional force becomes less than the displacement force in the direction of arrow C. Saw blade 2
If the steel comes off, not only the cutting process becomes impossible, but also the saw blade 2 pops out at the same time as the falling, causing problems such as danger.

For this reason, a saw blade detachment prevention device as described in Japanese Utility Model Publication No. 57-26721 has been devised. As shown in FIG. 6, the principle of the present invention is to form holes 13 at equal intervals in the longitudinal direction of the band-shaped saw blade 12, and engage the drive wheel 14 and the driven wheel 15 with the holes 13 of the saw blade. A projection 16 is provided,
The projection 16 prevents the saw blade 12 from falling off.

[0007]

In the above-described apparatus for preventing the blade from coming off, the saw blade 12 has a large number of holes 13 so that there is a problem in strength, and the driving wheel 14 and the driven wheel 15 have projections 16.
Is required, and there is a problem that the configuration becomes complicated.

The present invention has been made in view of the above-described conventional problems, and has as its object to realize a band sawing machine that can easily prevent a saw blade from falling off a pulley and can reliably prevent the blade from falling off.

[0009]

In the band saw having the mechanism for preventing the blade from coming off according to the present invention, the band-shaped saw blade formed in a loop shape is provided on one surface with a flange for guiding the back of the blade. And a driven saw pulley between the driven pulley 24 and the driven pulley 25, and one of the saw blade portions between the driven pulley 24 and the driven pulley 25 is a cutting region. Pulley 25
Of the other saw blade between the drive pulley 24 and the driven pulley 25 and facing the blade side of the saw blade 26. A mechanism 30 is provided to prevent the saw blade from coming off the pulley.

[0010] In addition, the present invention is characterized in that serration heads 29 and 29 'are provided so that the cutting area of the saw blade 26 can be inclined with respect to the axes of the driving pulley 24 and the driven pulley 25.

By adopting this configuration, a band sawing machine capable of reliably preventing the saw blade from falling off the pulley can be obtained.

[0012]

FIG. 1 is a view showing an embodiment of a band sawing machine having a saw blade detachment preventing mechanism according to the present invention. FIG. 1A is a view showing the inside of a frame 20, which is hollow and arcuate. A drive pulley 24 driven by a drive motor 21 via gears 22 and 23 and a driven pulley 25 are provided in the frame 20, and a loop-shaped between the drive pulley 24 and the driven pulley 25. The band-shaped saw blade 26 formed in the above is stretched. The drive pulley 24 and the driven pulley 25 are provided with a flange 27 for guiding the back of the saw blade 26 as shown in FIG.

The driving pulley 24 and the driven pulley 25
The portion of the saw blade 26 spanned between the frame 20 and accommodated in the frame 20 is guided by a number of guide rollers 28 provided on the frame 20 and is given tension. The portion of the saw blade 26 extending outside the frame 20 has an angle θ due to the serration heads 29 and 29 ′ provided near the respective pulleys 24 and 25 of the frame 20.
(About 45 °). Although this frame 20 is not shown, it is swingably supported on a base as in the conventional example described with reference to FIG.

Further, the saw blade detachment prevention mechanism 30 which is a feature of the present invention is provided near the driving pulley 24 and the driven pulley 25 in the frame 20 respectively. FIG. 2 is a view showing the present embodiment including the saw blade detachment prevention mechanism,
(A) is a sectional view of a main part, and (b) is a view on arrow Z of (a). In the figure, reference numeral 20 denotes a frame, and 24 denotes a driving pulley. A gear 23 is fixed to the drive pulley 24, and both are supported by shafts 32 provided on the frame 20 via bearings 33 and 33 ′, and a saw blade 26 is stretched over the drive pulley 24.

Then, the saw blade detachment preventing mechanism 30 is connected to the saw blade 26.
And is fixed to the frame 20 with a gap G therebetween. The structure of the saw blade detachment prevention mechanism 30 is as follows.
(B) As shown in the figure, it is comprised of a saw blade detachment prevention roller 31, a pin 34 for supporting the saw blade detachment prevention roller 31, and a bearing fitting 35. The bearing member 35 rotatably supports the saw blade detachment prevention roller 31 by a pin 34. Note that the saw blade detachment prevention roller 31 is hardened so as to have a high hardness.

The operation of the embodiment constructed as described above will be described with reference to FIG. In the present embodiment, the saw blade 26 is rotated by rotating the drive pulley 24 by the drive motor.
The work material can be cut and cut in the cutting processing region. In this case, when the saw blade 26 is rotating normally, the saw blade 26 prevents
The gap G between them, the roller 31 for preventing the blade from coming off.
Do not touch.

However, if the saw blade 26 comes off from the driving pulley 24 or the driven pulley 25 in the direction of arrow D due to the adhesion of oil or the like, the saw blade separating roller 31 is turned off.
, And can be prevented from coming off the pulley. In this case, the saw blade disengagement prevention roller 31 is in rolling contact with the blade of the saw blade 26 and has very high hardness, so that the saw blade 26 has very little abrasion and wear.

[0018]

According to the band sawing machine having the mechanism for preventing the blade from coming off according to the present invention, the band sawing machine in which the loop-shaped saw blade is bridged between the driving pulley and the driven pulley is close to each pulley. By providing the saw blade detachment prevention mechanism, the detachment of the saw blade from the pulley can be reliably prevented, which can contribute to an improvement in the operation rate and an improvement in safety.

[Brief description of the drawings]

1A and 1B are diagrams showing an embodiment of the present invention, wherein FIG. 1A is a diagram showing a state in which a cover of a frame is removed, and FIG. 1B is a cross-sectional view taken along line bb of FIG.

2A and 2B are diagrams showing an embodiment of the present invention, wherein FIG. 2A is a cross-sectional view of a main part, and FIG. 2B is an enlarged view of FIG.

FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention.

FIG. 4 is a perspective view showing an example of a conventional band saw machine.

FIG. 5 is a view for explaining a problem of the band sawing machine shown in FIG. 4;

FIG. 6 is a diagram illustrating the principle of a conventional saw blade detachment prevention mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Frame 21 ... Drive motor 22, 23 ... Gear 24 ... Drive pulley 25 ... Driven pulley 26 ... Saw blade 27 ... Flange 28 ... Guide roller 29, 29 '... Seri head 30 ... Saw blade detachment prevention mechanism 31 ... Saw blade detachment prevention Roller 32 ... Shaft 33, 33 '... Bearing 34 ... Pin 35 ... Bearing

Claims (2)

[Claims] 1. A band-shaped saw blade (26) formed in a loop shape.
And a driven pulley (25) having a flange (27) for guiding the back of the saw blade (26) on one surface thereof, and a driven pulley (25).
4) A band sawing machine in which one of the saw blade portions between the driven pulley (25) and the driven pulley (25) is a cutting region, wherein the other saw blade portion between the drive pulley (24) and the driven pulley (25) is: A saw blade disengagement prevention roller (31) disposed at a position close to the driving pulley (24) and the driven pulley (25), respectively, and facing the blade side of the saw blade (26).
A band sawing machine having a saw blade detachment prevention mechanism provided with a saw blade detachment prevention mechanism (30) having a function of preventing the saw blade from coming off the pulley. 2. A serration head (29, 29 ') which makes it possible to incline the cutting area of the saw blade (26) with respect to the axes of a driving pulley (24) and a driven pulley (25). A band sawing machine having a saw blade detachment prevention mechanism according to claim 1.