JPH0798286B2 - Horizontal band saw machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal band saw machine, and more specifically, a diameter of a drive wheel around which a band saw blade is wound and a diameter of a driven wheel are different from each other. Regarding horizontal band saw machine.

(Prior Art) Conventionally, in a horizontal band saw machine, it is general that the diameter of the drive wheel around which the band saw blade is wound is the same as that of the driven wheel.

In the band saw machine, the cutting ability (capacity) is mainly determined by the diameters of the driving and driven wheels and the distance between both wheels, and the twist angle of the band saw machine.

Conventionally, for example, when cutting a rectangular column having a square ring-shaped cross-section, in order to avoid an increase in cutting resistance and various problems caused by a long cutting length, a band saw blade is provided on each side of the rectangular column. There is a band saw that is inclined with respect to the section. In the horizontal band saw machine, the traveling line of the band saw blade is inclined at a predetermined angle with respect to the horizontal at the end of cutting the work.

As described above, in the horizontal band saw machine, when the traveling line of the band saw blade is inclined with respect to the horizontal, for example, when the driving wheel and the driven wheel have the same axial distance, the traveling line is horizontal. The cutting ability is smaller than that of. Therefore, in order to increase the cutting ability, it is necessary to increase the diameters of the driving and driven wheels to increase the distance between the straight portions of the band saw blade between both wheels and increase the axial distance.

(Problems to be solved by the invention) When the diameters of the driving and driven wheels are increased and the distance between the shafts is increased, the overall configuration is increased, and extra portions are increased, resulting in a large amount of wasted space. There is a problem.

(Means for Solving Problems) In order to solve the above-mentioned conventional problems, in the present invention, the diameter of the driven wheel is larger than the diameter of the drive wheel around which the band saw blade for cutting the workpiece is wound. And the axial center position of the driven wheel is provided at a position lower than the axial center position of the driven wheel when the driven wheel has the same diameter as the drive wheel and closer to the drive wheel. Is.

(Operation) Since the diameter of the driven wheel is made smaller than the diameter of the driving wheel, the band saw blade naturally tilts even if the axis of the driving wheel and the axis of the driven wheel are arranged on the horizontal line, for example. It will be. In addition, the driven wheel can be brought closer to the drive wheel by the reduced diameter of the driven wheel, and the overall structure can be reduced accordingly, resulting in less wasted space.

(Embodiment) Referring to FIG. 1, a horizontal band saw machine 1 is composed of a box-shaped base 3 and a cutting head 5.
The cutting head 5 is supported on the base 3 via a hinge pin 7 so as to be vertically swingable. Further, a work table 9 on which the work piece W to be cut is placed is provided on the base 3, and the work table 9 has a fixed vise jaw 11f and a movable vise for holding and fixing the work piece W. A vise position 11 equipped with a jaw 11m and a vise cylinder 11c is mounted. The cutting head 5 includes housing parts 13 and 15, and the housing parts 13 and 15 are integrally connected by a beam member 17.

In the housing parts 13 and 15 of the cutting head 5, there are a drive wheel 19 and a driven wheel 21, respectively.
It is rotatably installed via 3, 25. In order to easily attach and detach the endless band saw blade 27 wound around the drive wheel 19 and the driven wheel 21, the band saw blade 27
In order to apply tension to the driven wheel 21, the driven wheel 21 is provided so as to be movable and adjustable in a direction in which the driven wheel 21 moves toward and away from the drive wheel 19.

In order to guide and hold the cutting edge of the lower side 27L of the straight part of the band saw blade 27, which is wound around the drive wheel 19 and the driven wheel 21, into the workpiece W, it is movable with the fixed guide arm 29 so as to be held vertically downward. A guide arm 31 is provided.

More specifically, the upper portions of the both guide arms 29, 31 are supported by the guide member 33 fixed to the beam member 17, and the band saw blade 27 is vertically twisted at the lower end portions thereof. Band saw blade guides 35 and 37 for guiding are provided respectively. The fixed guide arm 29 is fixedly supported by the guide member 33, and the movable guide arm 31 adjusts the cutting action portion of the band saw blade 27 according to the size of the workpiece W to be cut. The fixed guide arm 29 is supported so as to be positionally adjustable and fixed in a direction toward and away from the fixed guide arm 29.

The cutting head 5 cuts the band saw blade 27 with respect to the workpiece W and separates the band saw blade 27 upward from the workpiece W by operating a lifting hydraulic cylinder (not shown). It is configured to swing vertically around the hinge pin 7. As is known, when pressure oil is supplied to the lifting hydraulic cylinder, the cutting head 5 rises, and by draining the pressure oil from the lifting hydraulic cylinder, the cutting head 5 descends by its own weight.

As can be understood from FIG. 1, in this embodiment, the diameter of the driven wheel 21 is smaller than the diameter of the drive wheel 19. Then, when the cutting head 5 descends from the raised position and the cutting of the workpiece W is completed, the lower side 27L of the band saw blade 27 is greatly inclined and the upper side 27U of the straight part of the band saw blade 27 is located. The inclination angle is smaller than the inclination angle of the lower side 27L, and is provided so as to be almost horizontal.

At the end of cutting the workpiece W, the drive wheel
The lowermost position LP of the outer peripheral portion of 19 is located lower than the lower surface WL of the workpiece W.

By the way, conventionally, as shown in FIG.
Since the diameters of 19 and the driven wheel 21 'are set to be substantially equal to each other, the lower side of the band saw blade 27 is cut at the end of cutting the workpiece W.
If 27L is held tilted with respect to the horizontal,
The upper side 27U 'of 7 also has the same inclination, and a relatively large wasted space S is formed between the upper part of the workpiece W and the upper side 27U' of the band saw blade 27, and the overall structure is large. Has become.

However, in this embodiment, as can be understood from FIG. 2, the diameter of the driven wheel 21 is made smaller than that of the conventional wheel, and the axial position 21S of the driven wheel 21 is set to the conventional driven wheel 21 '. Is located closer to the drive wheel 19 than the shaft center position 21'S and is displaced to the side where the band saw blade 27 cuts (lower side in FIG. 2) with respect to the workpiece W. Therefore, when the cutting of the workpiece W is completed, the inclination angle of the upper side 27U of the band saw blade 27 is small and becomes substantially horizontal, so that the inclination angle of the lower side 27L of the band saw blade 27 is kept the same as in the conventional case. However, as is clear from FIG. 2, the H dimension is reduced in the height direction and the L dimension is reduced in the lateral width direction, and the overall structure can be made smaller than in the conventional case.

As already understood, if the cutting capacity is almost the same,
Although it is possible to reduce the H dimension in the height direction and the L dimension in the lateral direction, conversely, for example, in the case where the overall configuration is maintained at approximately the same size as the conventional one and the configuration as described above is adopted, Since the diameter of the driven wheel is small, the distance between the two wheel shafts can be increased by that much, and the cutting capacity can be increased more than ever before.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, it can be easily implemented in a band saw machine of a type in which the cutting head is vertically moved by being guided by a vertical guide post. Further, for example, it is possible to arrange a large number of guide rollers at a position corresponding to the outer diameter of the driven wheel, and in this case, a large number of guide rollers correspond to the driven wheel.

[Effects of the Invention] As will be understood from the above description of the embodiments, in short, in the present invention, the diameter of the driven wheel 21 is smaller than the diameter of the drive wheel 19 provided in the vertically movable cutting head 5. Further, at the end of cutting the workpiece W, the lower side 27L of the band saw blade 27 is inclined, and the lowermost position LP of the outer peripheral portion of the drive wheel 19 is positioned lower than the lower surface WL of the workpiece W. Is.
The axial center position 21S of the driven wheel 21 having a small diameter is lower than the axial center position 21'S of the driven wheel 21 'in the case where the driven wheel 21 has the same diameter as the drive wheel 19, and the drive wheel is in the lower position. It is located close to 19.

Therefore, according to the present invention, as is clear from the description with reference to FIG. 2, when the cutting capacities are substantially equal to each other, the H dimension in the height direction and the L dimension in the lateral width direction can be made smaller than in the conventional case. Yes, the cutting head can be made smaller and the overall configuration can be made smaller without changing the cutting ability. In other words, when the cutting heads have the same size, the cutting capacity can be increased.

Further, in the present invention, since the diameter of the driven wheel 21 is made smaller than the diameter of the drive wheel 19, it is possible to obtain a sufficient moment of inertia without adding any improvement to the drive wheel 19. Therefore, the driving of the band saw blade 27 does not cause any problem.

That is, in the present invention, the diameter of the driven wheel is made smaller than that of the conventional one to achieve the downsizing of the overall configuration, while maintaining the same cutting capacity as the conventional one, and
It is possible to reduce the size of the entire structure while securing the same cutting capacity as the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic front view of a band saw machine according to an embodiment of the present invention. FIG. 2 is an explanatory diagram for comparison with the prior art. 19 …… Drive wheel, 21 …… Drive wheel 27 …… Band saw blade, 27L …… Lower side of band saw blade 27 …… Upper side of band saw blade

Claims (1)

[Claims] 1. A drive wheel (19) around which a band saw blade (27) for cutting a work piece (W) fixed on a base (3) and a driven wheel (21) are rotatably provided. A horizontal band saw machine having a cutting head (5) vertically movable on the base (3), and a driven wheel (21) having a diameter smaller than that of the drive wheel (19). , The lower side (27L) of the band saw blade (27) is inclined when the cutting head (5) descends from the raised position and the cutting of the workpiece (W) is completed, and Lowermost position of outer circumference (LP)
Is located lower than the lower surface (WL) of the workpiece (W), and the driven wheel (21) has the same diameter as the drive wheel (19), the axis of the driven wheel (21 '). A horizontal band saw characterized in that an axial center position (21S) of a driven wheel (21) having a smaller diameter than the center position (21'S) is arranged at a lower position and at a position closer to the drive wheel (19). Board.