JPH0111389Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates primarily to a saw machine used as a metal saw for cutting various metal materials.

Prior art and its problems This type of conventional saw machine, as shown in Figure 1,
A saw support body 2 is fixed to a shaft 1 so as to be rotatable in a cantilevered state.
A fixed pulley 3 driven by a motor or the like, and a free pulley 4 facing the fixed pulley 3 at an appropriate distance Lv are provided, and the two pulleys 3
It has a structure in which an endless band saw 5 is stretched between -4 and 4. The outer peripheries of the fixed pulley 3 and free pulley 4 that are connected to the band saw 5 are lined with an elastic material such as rubber in order to improve the adhesion of the band saw 5 and to prevent scratches between the two. In addition, in order to connect the pulleys 3 and 4 in an appropriate tightened state without causing the band saw 5 to become sagged or overtightened, a variable mechanism that changes the facing distance Lv between the free pulley 4 and the fixed pulley 3 is provided. It is normal to provide 6. The variable mechanism 6 includes a free pulley 4 mounted on the bottom plate 21 of the saw support 2, as shown in an enlarged view in FIG.
A movable body 61 which is rotatably fixed on a shaft is brought into contact with the movable body 61, and the movable body 61 is moved in directions a and b parallel to the bottom plate 21 by guides 62 and 63 fixed to the bottom plate 21 of the saw support 2. By rotationally adjusting an adjusting screw 64 which is movably supported and mounted on the saw support 2, the movable body 61 is moved in directions a and b, and the facing distance Lv is adjusted. .

However, in this type of saw machine, the band saw 5 is connected to the fixed pulley 3 and free pulley 4 in a twisted state, so the band saw 5 inherently tends to fall off from the fixed pulley 3 and free pulley 4. be. Moreover, in the conventional structure shown in FIGS. 1 and 2, the elastic material such as rubber lined around the outer periphery of the fixed pulley 3 and the free pulley 4 wears out most at the lower end corresponding to the saw teeth of the band saw 5. Therefore, there was a problem in that the above-mentioned inherent tendency to fall off was accelerated, and the band saw 5 easily fell off.

As a conventional technique for solving this drawback, a structure shown in FIG. 3 is known. In the figure, the same reference numerals as in FIG. 2 indicate the same components. In this conventional example, the variable mechanism 6
A hinge 65 is fixed to the upper surface of the movable body 61 by means such as welding, and the free pulley 4 is rotatably fixed on the hinge 65.
The set screw 66 is inserted from the bottom surface to the top surface of the bottom plate 21
is screwed in, and the tip of the set screw 66 is pressed against the hinge 65.

When the rubber lining provided on the outer peripheral surface of the fixed pulley 3 or the free pulley 4 wears out, loosening the set screw 66 by an amount corresponding to the amount of wear causes the rotational axis O1 of the free pulley 4 to change accordingly. It is inclined in the direction of the rotation axis O2. This adjustment of the inclination direction of the rotation axis prevents the band saw 5 from falling off due to lining wear.

However, since the hinge 65 has a structure in which the fixed piece 651 and the movable piece 652 are combined in a U shape, the substantial thickness h of the hinge 65 increases, and the height H of the free pulley 4 and the fixed pulley 3, that is, the fixed Pulley 3
And the axial length of the free pulley 4 increases. Therefore, when the band saw 5 is connected to the fixed pulley 3 and the free pulley 4, the moment (A) acting between both pulleys 3 and 4 increases, and the bottom plate 21 of the saw support 2 curves upward under the action of
There was a serious defect that caused the band saw 5 to fall off, the bottom plate 21 to abnormally vibrate, and the resulting noise to occur, impairing normal operation.

Purpose of the present invention Therefore, the present invention reduces the moment acting between the fixed pulley and the free pulley to prevent warpage and distortion of the saw support, thereby reducing the fall of the band saw, abnormal vibration of the saw support, and the resulting noise. It is an object of the present invention to provide a sawing machine capable of preventing the occurrence of such problems.

Structure of the Present Invention In order to achieve the above object, the present invention provides a saw support with a fixed pulley and a free pulley having a mechanism for varying the facing distance between the fixed pulley and the fixed pulley.
In a saw machine having an endless band saw stretched between the two pulleys, a cantilevered leaf spring is provided at a distance above the movable body constituting the mechanism to receive the rotating shaft of the free pulley from below. The present invention is characterized in that a set screw is attached to the saw support body, and the set screw changes the spacing by pressing the free end side of the cantilever plate spring.

Embodiment FIG. 4 is an enlarged partial sectional view of the main part of the saw machine according to the present invention. In the figures, the same reference numerals as in FIGS. 1 to 3 indicate the same components. In this embodiment, instead of the conventional hinge, a cantilever leaf spring 67 is fixed on the movable body 61 with, for example, a screw 68, and the free pulley 4 is rotatably fixed to the cantilever leaf spring 67. It has a similar structure. The cantilever plate spring 67 is attached so that a distance d1 is formed between it and the upper surface of the movable body 61. In this embodiment, a spacing regulating piece 69 is interposed between the movable body 61 and the cantilever leaf spring 67, and is fixed with a screw 68 to form the spacing d1.

In the above structure, when the set screw 66 is rotated and adjusted, the free end of the cantilever leaf spring 67 is pushed up or down by the set screw 66 depending on the amount of rotation.
The inclination direction of the rotation axis O of the free pulley 4 is adjusted. In this case, since the cantilever leaf spring 67 can be formed to be significantly thinner than the conventional hinge structure, the axial length H of the free pulley 4 and the fixed pulley 3 is reduced, and the moment acting between them 3 and 4 is reduced. be able to. Therefore, according to the present invention, the saw support 2
It is possible to realize a saw machine that prevents the bottom plate 21 from warping and distortion due to moment, and does not cause the band saw 5 to fall off, the bottom plate 21 to vibrate abnormally, and generate noise due to the band saw 5.

Further, in this embodiment, the movable body 61 is extended outward from the outer circumference of the free pulley 4, and the adjustment screw 64 for driving the movable body 61 is attached to the free pulley 4.
By positioning it outside of the free pulley 4 and providing a free space below the free pulley 4, the axial length H can be made smaller.

Effects of the present invention As described above, the present invention provides a saw support with a fixed pulley and a free pulley having a mechanism for varying the opposing distance between the fixed pulley and the gap between the two pulleys. In a saw machine equipped with an endless band saw, a cantilever leaf spring is installed at intervals on the movable body constituting the mechanism to receive the rotating shaft of the free pulley from below, and the cantilever plate Since the saw support is equipped with a press screw that presses the free end side of the spring to vary the spacing, the moment acting between the fixed pulley and the free pulley can be reduced and the saw support Prevents warping and distortion, and prevents the band saw from falling off.
It is possible to provide a saw machine that can prevent abnormal vibrations of the saw support, generation of noise, etc.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of a conventional saw machine;
3 is an enlarged partial sectional view of the essential parts of another conventional example, and FIG. 4 is an enlarged partial sectional view of the essential parts of the saw machine according to the present invention. 2... Saw support, 3... Fixed pulley, 4... Free pulley, 5... Band saw, 61... Movable body, 64...
...adjustment screw, 67...cantilever plate spring, 69...press screw.

Claims (1)

[Scope of utility model registration request] In a saw machine in which a saw support is provided with a fixed pulley and a free pulley having a mechanism for varying the facing distance between the fixed pulley and an endless band saw stretched between the two pulleys, the mechanism A cantilevered leaf spring is installed at a distance on the movable body constituting the free pulley for receiving the rotating shaft of the free pulley from below, and a press screw is configured to press the free end side of the cantilevered leaf spring to vary the distance. attached to the saw support body.