JPH0135784Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a band saw device, and more particularly to a band saw device that can extend the life of the band saw by improving a device for suspending and driving the band saw.

Purpose of the invention In a band saw device, the band saw, which is suspended on a pulley and driven by the pulley, often breaks and becomes unusable before the blade wears out and becomes unusable. It is requested that it be made into

Conventionally, band saw breakage was caused by tensile load acting on the band saw and wear of the band saw, so band saws using materials with excellent rigidity and wear resistance, such as stainless steel, were developed. has been put into practical use. The band saw is less likely to wear out and has a longer lifespan than a commonly used band saw made of tool steel or the like. However, the blade part breaks before it becomes unusable, so it is difficult to say that it is sufficient for practical use.

The present invention has been devised in view of the above-mentioned conventional circumstances, and its purpose is to provide a band saw device that can extend the life of the band saw, and in particular, to provide a band saw device that has an improved device for suspending and driving the band saw. Our goal is to provide the following.

Structure of the invention As a result of research to achieve the above object, the inventor of the present invention has provided a means for driving the band saw separately from a pulley on which the band saw is suspended, and a thin film between the outer circumferential surface of the pulley on which the band saw is suspended and the band saw. Reduces band saw wear by configuring to form a fluid film;
We have obtained the knowledge that it is possible to extend the life of band saws.

The present invention was completed based on the above findings, and consists of a plurality of fixedly arranged fluid pressure pulleys having a large number of pressure fluid supply holes,
a pressure fluid supply source communicating with the pressure fluid supply hole;
A band saw apparatus having a hydraulic pulley, characterized in that it comprises a band saw suspended on the hydraulic pulley, and a driving means that engages with the band saw in a straight section between the hydraulic pulleys.

The present invention will be explained in detail based on the principle diagram of the invention shown in FIG. In the figure, 1 is a band saw. 2
and 3 are first and second hydraulic pulleys,
It has a large number of pressure fluid supply holes 23, 33 connected to a pressure fluid supply source (not shown), and is disposed in a fixed position, that is, in a non-rotating state, in the body (not shown). Reference numeral 4 denotes a pair of friction drive rollers constituting the drive means of the band saw, which are provided so as to press and hold the band saw 1 from both sides. In addition, the friction drive roller 4
is preferably made of a material such as urethane that has excellent wear resistance and does not cause wear on the band saw. W is a workpiece.

The band saw device shown in the figure is constructed as described above, and its operation is performed as follows. Band saw 1 is
Suspended from each pulley to provide less tension than in conventional bandsaw equipment, supplying pressurized fluid, such as pressurized water, from a pressurized fluid source;
Pressure water is ejected from the pressure fluid supply holes 23, 33 as shown by arrows, and a thin water film is formed between the band saw 1 and the outer peripheral surface of each pulley 2, 3, and is maintained under a predetermined tension. Next, when the friction drive roller 4 is rotated in the direction of the arrow, the band saw is frictionally transmitted and moved in the direction of the arrow. Then, the workpiece W is placed on the band saw 1.
The workpiece W is cut by moving in a direction perpendicular to the direction of movement of the workpiece W.

In the above, the band saw 1 causes wear due to frictional contact with the friction drive roller 4 and the workpiece W, but since it does not come into frictional contact with the pulleys 2 and 3, the blade part is worn. It has become almost impossible for the product to break before it reaches an unusable state. That is, since the band saw 1 is smoothly guided and supported by each of the pulleys 2 and 3 via a thin water film, it does not come into direct contact with the outer circumferential surface of each of the pulleys 2 and 3, thereby preventing wear. Further, the friction drive roller 4 drives only the band saw 1, and there is no need to drive a pulley via the band saw unlike in the conventional roller. It can be much smaller than the saw blade, and there is no need to increase the pressing force with the band saw 1. Therefore,
Although the band saw 1 is in frictional contact with the friction drive roller 4, the wear is much less than in conventional band saw devices. Therefore, the amount of wear of the band saw as a whole until the blade of the band saw 1 wears out and reaches an unusable state is small, and the thickness is maintained within a range that can sufficiently withstand the tensile load acting on the band saw. The band saw 1 can now be used without breaking until the blade part wears out and becomes unusable.

Although the band saw 1 is driven by a drive means having a friction drive roller 4, the band saw is provided with an engagement hole and the band saw is driven by a sprocket that cooperates with the engagement hole. Alternatively, it may be driven by a linear motor of which the band saw is a part.

EXAMPLES The present invention will be explained by examples. FIG. 2 is a schematic front view of the first embodiment of the present invention, and FIG. 3 is a side view thereof. FIG. 4 is a sectional view taken along the line - in FIG. 1, and the symbols in parentheses indicate each member of the second fluid pressure pulley 3 corresponding to the first fluid pressure pulley 2. In the figure, the same reference numerals as in FIG. 1 indicate the same functional members. The first fluid pressure pulley 2 and the second fluid pressure pulley 3 have the same structure, and have convex edges 2 provided at both axial ends of the outer peripheral surfaces 22 and 32.
1, 31, a large number of pressure fluid supply holes 23, 33 provided so as to open on the outer peripheral surfaces 22, 32, a pressure fluid supply passage 24 for supplying pressure fluid, for example, pressure water, to the pressure fluid supply holes 23, 33; 34. P is a pressure fluid source. A is a part of the fuselage.

In this embodiment, the band saw 1 is disposed on each pulley 2, 3 so as to face the outer peripheral surfaces 22, 32 having convex edges 21, 31, so that the convex edges 21, 32 shown in the figure are not provided. A closed space is formed in the range, and the band saw 1 and each pulley 2, 3 are
A thin water film is formed between the outer circumferential surfaces 22 and 32 of. Therefore, the band saw 1 is guided and supported by the outer circumferential surfaces 22, 32 of each pulley 2, 3 via a thin water film. Further, since the band saw 1 is prevented from moving in the axial direction by the convex edges 21 and 31, the band saw 1 is prevented from falling off the pulley.

In addition, the outer peripheral surfaces 22, 32 of each pulley 2, 3
As shown in FIGS. 5 and 6, which correspond to FIG. 4, relief grooves 25 and 35 are provided in the blade portion 11 of the band saw to prevent contact between the blade portion 11 and the outer circumferential surfaces 22 and 32. You can do it like this. Further, the outer circumferential surfaces 22, 32 of each pulley 2, 3 may be tapered as shown in FIG.

Effects of the invention The band saw device of the invention has the following effects compared to conventional ones.

Since the band saw is guided and supported by the hydraulic pulley by a thin fluid film, there is no frictional contact with the pulley and no wear is caused by the pulley. Further, since the band saw and the driving means are not pressed as strongly as in the conventional saw, the amount of wear caused by the driving means is small. Therefore, it has become possible to use the band saw without breaking the blade until it becomes unusable due to wear.

The driving means for the band saw does not require as large a driving force as the conventional one, and the pressing force with the band saw is also small, making it possible to downsize the device.

Band saws, as mentioned above, do not come into frictional contact with pulleys, so they do not undergo thermal expansion as much as conventional ones, and even if they do thermally expand due to frictional contact with the drive means or workpiece, It is cooled by pressure fluid and automatically maintained at a predetermined tension.

As described above, the present invention was able to achieve the above object with the above configuration.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of the present invention, Fig. 2 is a schematic front view of an embodiment of the invention, Fig. 3 is a side view,
Figure 4 is a sectional view taken along the - line in Figure 1;
This figure and FIG. 6 are sectional views corresponding to FIG. 4 of another embodiment. 1... band saw, 2... first pulley, 3... second
Pulley, 4...Friction drive roller, 21...Convex edge, 22...Outer peripheral surface, 23...Pressure fluid supply hole,
24... Pressure fluid supply passage, P... Pressure fluid supply source.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of fluid pressure pulleys having a large number of pressure fluid supply holes and fixedly arranged, a pressure fluid supply source communicating with the pressure fluid supply holes, and a fluid pressure pulley connected to the fluid pressure pulley. 1. A band saw device with hydraulic pulleys, characterized in that it comprises a suspended band saw and drive means for engaging the saw band in a straight section between the hydraulic pulleys. (2) A band saw device having a hydraulic pulley according to claim 1, wherein the hydraulic pulley has the pressure fluid supply hole on an outer peripheral surface facing the band saw. . (3) A band saw apparatus having a hydraulic pulley according to claim 1 or 2, wherein the pressure fluid supply source supplies pressurized water. (4) The hydraulic pulley according to any one of claims 1 to 3, wherein the driving means includes a friction drive roller that presses and clamps the bandsaw from both sides. band saw equipment.