JP2549851Y2 - Band sawing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band saw, and more particularly, to a structure for moving a driven wheel when a band saw is mounted and removed.

[0002]

2. Description of the Related Art Generally, a band sawing machine which moves a movable frame by a load of a movable frame having a band saw blade and cuts a workpiece is widely known. In such a band sawing machine, the band saw blade is stretched between a driving wheel and a driven wheel housed in a movable frame. Then, when replacing the band saw blade, the driven wheel is moved to the drive wheel side by advancing or retreating the screw shaft, etc., the band saw blade is loosened and removed, and the mounting is performed.
A band saw machine with a stopper mechanism that prevents the band saw blade from being over-tensioned when the band saw blade is tensioned by moving the driven wheel by the screw shaft and tensioning the band saw blade has been conventionally proposed. (Shinko Shoji 60-2)
No. 9376).

[0003]

However, in the above-mentioned band sawing machine, there is no stopper mechanism when the driven wheel is moved to loosen the band saw blade, and the band saw is moved if the moving amount of the driven wheel is too large. There is a problem that the blade may come off the wheel.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a band saw machine in which a driven wheel moves a predetermined distance.

[0005]

According to the present invention, a material to be cut is provided.
A base (1) on which the (2) is placed, and a band saw blade ( 1) rotatably provided on the base (1) via a hinge shaft (8) and cutting the material to be cut (2). 13) the a movable frame for housing in a state of being tensioned (9) between the drive wheel (11) and the driven wheel (12), workpiece on the movable frame (9) the base (1) (2) In the band sawing machine configured to cut the workpiece (2) while turning to the side, the movable frame (9) supports the slide member (17) so as to be movable in the loosening direction.
(15) is provided, and the slide member (17 ) is provided with a shaft.
The driven wheel (12) is rotatably provided through (18), and is connected to the slide member (17) and the movable frame.
(9) with the slide member (17)
Serial the driven wheel (12) is a spring (29) which constantly urge the direction the band saw blade (13) is tensioned is provided, the groove in the slide member (17) (17b) is formed, the groove portion (17b ) the movable frame (9) rotatably provided rotary shaft (22) in a fixed eccentric shaft eccentrically (25) is engaged in, the rotary shaft to the rotating shaft (22) ( An operation member (24 ) for rotating ( 22) is provided.

[0006]

[Function] To remove the band saw blade, operate the operating member,
By rotating the rotating shaft, the eccentric shaft moves along the groove, and moves the slide member against the urging force of the urging mechanism. Accordingly, the driven wheel rotatably provided on the slide member also moves. Then, the tension state of the band saw blade is released, and the operator can easily remove the band saw blade. Further, the slide member moves only a predetermined distance, and the band saw blade does not come off unexpectedly.

Further, when attaching the band saw blade, a twist is applied to the band saw blade, and the band saw blade is temporarily installed on both wheels. At this time, the band saw blade does not come off. Then, by operating the operation member and rotating the rotation shaft, the eccentric shaft moves along the groove, and the slide member is moved by the urging force of the urging mechanism. Accordingly, the driven wheel rotatably provided on the slide member also moves, and the band saw blade is in a tensioned state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of the band saw according to the present invention. In the figure, reference numeral 1 denotes a base, and a fixed clamper 3 for clamping a workpiece 2 is fixed to the upper surface of the base 1. Further, the fixed clamper 3 is opposed to the movable clamper 4, and the movable clamper 4 is disposed so as to be movable in the left-right direction in the figure.
A nut block 5 is fixed to the movable clamper 4. A screw shaft 6 is screwed into the nut block 5, and the screw shaft 6 is configured to be rotated by a handle 7. A movable frame 9 is rotatably provided on the right end side of the base 1 in the figure via a hinge shaft 8. A drive wheel 11 connected to a motor 10 and a driven wheel 12 are housed in the movable frame 9, and a band saw blade 13 is stretched between the drive wheel 11 and the driven wheel 12.
The movable frame 9 is formed with a cut-away portion 9a having a concave shape, and the workpiece 2 is positioned in the cut-away portion 9a during a cutting operation. Seri guides 14 are provided at both ends of the cutting travel notch 9a, and the direction of the band saw blade 13 is adjusted by the serration guides 14 so as to be perpendicular to the workpiece 2.

FIG. 2 is a partially enlarged view of a mounting portion of the driven wheel 12, and FIG. 3 is a sectional view taken along the line III-III in FIG. FIG.
, The movable frame 9 has two plates 15, 1
5 is fixed with screws 16, 16, 16, 16 with a predetermined gap. A slide block 17 is movably disposed between the two plates 15. That is, as shown in FIG. 4, grooves 17a, 17a are formed on the side of
The plates 15, 15 are fitted into 7 a, 17 a to support the slide block 17. A shaft 18 is inserted into the slide block 17 while being prevented from rotating.
The driven wheel 12 is rotatably provided through the intermediate wheel 9. The bearing 19 is prevented from falling off by the holding plate 20 and the screw 21.

On the other hand, the rotating shaft 2
2 is rotatably provided, and FIG.
A lever 24 is attached to the middle upper part with a screw 23
I have . Further, an eccentric shaft 25 eccentrically fixed to the rotating shaft 22 is formed at a lower portion of the rotating shaft 22 in FIG. A ring member 26 is fitted into the eccentric shaft 25, and the ring member 26 is slidably mounted in an elongated hole 17b formed in the slide block 17. Also,
On the right side of the slide block 17 in FIG.
Is screwed. The adjusting bolt 27 penetrates a boss 9 b formed on the movable frame 9, and a compression coil spring 29 is provided between the boss 9 b and a flat washer 28 attached to a bolt head 27 a of the adjusting bolt 27. By biasing the adjustment bolt 27 rightward in FIG. 3, the driven wheel 12 tensions the band saw blade 13 via the slide block 17 and the shaft 18 (rightward in FIG. 3). It will be urged. The adjustment bolt 27
, The urging force of the compression coil spring 29 is changed, and the tension force for separating the driven wheel 12 from the drive wheel 11 and tensioning the band saw blade 13 is adjusted.

The operation of the band saw having the above construction will be described below. In FIG. 1, a workpiece 2 is placed on a base 1.
Is mounted, and the workpiece 2 is clamped by the fixed clamper 3 and the movable clamper 4. Thereafter, the motor 10 is driven to rotate the drive wheel 11 and move the band saw blade 13. Then, the movable frame 9 is connected to the hinge shaft 8.
The movable frame 9 is rotated counterclockwise around the hinge shaft 8 in FIG. 1 by the weight of the movable frame 9 against the urging force of a torsion coil spring (not shown) wound around the hinge. This allows the band saw blade 13 to cut the workpiece 2.

Next, the band saw blade 1 is exchanged for the band saw blade 13 or the like.
The operation of attaching and detaching 3 will be described. In FIG. 6B, the lever 24 is rotated around the rotation shaft 22. As a result, the eccentric shaft 25 is
6B, and moves to the left in FIG. 6B, as shown in FIG. 6A. That is, the slide block 17 moves leftward in FIG. 6B against the urging force of the compression coil spring 29. At this time, the moving direction is a direction in which the band saw blade 13 is loosened. Then, the loosened band saw blade 13 can be easily removed. By the way, the movement amount of the driven wheel 12 is such that the tension of the band saw blade 13 is removed, and the band saw blade 13
To the extent that it does not deviate from Preferably, the moving amount 1 is set to 3 to 5 mm.

When the band saw blade 13 is mounted, the band saw blade 13 must be twisted after being fitted into the serrated guide 14 and temporarily set on the wheels 11, 12, but the movement amount is set within the above-mentioned range. Therefore, even if the hand is released from the band saw blade 13 in the temporarily installed state, the band saw blade 13 does not come off from the wheels 11 and 12 and does not fly out. When the band saw blade 13 is stretched, by turning the lever 24 in the opposite direction when removing the band saw blade 13, the slide block 17 is moved by the urging force of the compression coil spring 29 as shown in FIG.
It is moved to the middle right, as shown in FIG.

This operation can be performed only by rotating the lever 24, and can be easily operated.

[0015]

According to the present invention, as described above, the slide member supporting the driven wheel moves only a predetermined distance during the work of attaching and detaching the band saw blade, so that the band saw blade becomes too tense and may be damaged. It is possible to prevent the danger that the band saw blade comes off unexpectedly.

[Brief description of the drawings]

FIG. 1 is a side view of the band saw according to the present invention.

FIG. 2 is a partial enlarged view of a mounting portion of a driven wheel of the band saw machine according to the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is an enlarged perspective view of a plate and a slide block.

FIG. 5 is a partially enlarged sectional view of a mounting portion of a driven wheel of the band saw machine according to the present invention.

FIG. 6 illustrates the operation of attaching and detaching the band saw blade of the band saw machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Material to be cut 8 ... Hinge shaft 9 ... Movable frame 11 ... Drive wheel 12 ... Driven wheel 13 ... Band saw blade 15 ... Plate (support member) 17 ... Slide block (slide member) 17b ... Slot (groove) 22 ... Rotating shaft 24 ... Lever (operating member) 25 ... Eccentric shaft

Claims (1)

(57) [Scope of request for utility model registration] 1. A base on which a material to be cut is placed, and a band saw blade, which is rotatably provided on the base via a hinge shaft and cuts the material to be cut, is provided between a driving wheel and a driven wheel. A movable frame for storing the material in a tensioned state, wherein the movable frame is rotated toward the material to be cut on the base to cut the material to be cut; A support member for supporting the member movably in the loosening direction is provided, the driven wheel is rotatably provided on the slide member via a shaft, and the support member is provided between the slide member and the movable frame.
A spring is provided that constantly biases the driven wheel in a direction in which the band saw blade is tensioned via a slide member, a groove is formed in the slide member, and a rotation is rotatably provided on the movable frame in the groove. An eccentric shaft fixed eccentrically to the shaft is engaged, and the rotating shaft is provided with an operating member for rotating the rotating shaft.