JP2522425Y2 - Saw blade tensioning device for vertical band sawing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a saw blade tensioning device in a vertical band sawing machine in which a vertically moving saw wheel is detachable from a product main body.

[Prior Art] A conventional technique will be described with reference to FIGS.

The upper saw wheel 20 has a detachable structure so that the cutting chips of the material attached to the back side of the upper saw wheel 20 can be easily cleaned.

Conventionally, a structure for attaching and detaching the upper saw wheel 20 will be described. The upper saw wheel 20 is supported by a saw wheel holder 21, and holder pins 22 project from both side surfaces 21 a of the saw wheel holder 21.
The holder pin 22 is horizontally inserted from the upper part of the guide groove 23a provided in the tensioner housing 23 fixed to the product body and guided downward, whereby the saw wheel holder 21 is hooked on the lower end of the tensioner shaft 24. The upper saw wheel 20 is attached to the tensioner housing 23.

The tensioner shaft 24 is screw-fitted to the tensioner housing 23, and the rotation of the handle 25 attached to the upper end of the tensioner shaft 24 causes the tensioner shaft 24 to move up and down. The car 20 also moves up and down (arrow a in the figure). The saw wheel holder 21 is regulated by the guide groove 23a so as to move only in the vertical direction.

When removing the upper saw wheel 20 from the tensioner housing 23, the upper saw wheel 20 can be removed by lifting the upper saw wheel 20 and removing the holder pin 22 from the guide groove 23a.

[Problems to be solved by the invention]

However, when attaching the saw wheel 20 to the tensioner housing 23, the operator holds the saw wheel 20 and tries to insert the holder pin 22 into the guide groove 23a in a hand-raising state, so that the saw wheel holder 21 is erroneously inserted into the tensioner housing 23. And the guide groove 23a may be deformed. As a result, there is a problem that a malfunction of the holder pin 22 inserted into the guide groove 23a is likely to occur. Therefore, the above saw wheel
The attachment and detachment of the 20 was very careful.

The purpose of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
An object of the present invention is to eliminate the occurrence of malfunction in such a saw blade tensioning device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a saw blade tensioning device that stretches a band saw blade to a pair of vertically opposed saw wheels and moves the saw wheel up and down to apply tension to the band saw blade.
An axial center of a slide pipe is provided in the tensioner housing in the up-down direction, a hook slider is loosely fitted to the slide pipe so as to be slidable up and down, and an arm is protruded from the hook slider toward the saw wheel. The arm portion is provided with a groove for detachably engaging the upper saw wheel.

[Action]

With the above configuration, the upper saw wheel can be easily attached to the hook slider by hooking the saw wheel into the groove formed in the arm portion.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a partial cross-sectional front view of a vertical band sawing machine showing an embodiment of the present invention, FIG. 2 is an enlarged view around the upper saw wheel storage chamber in FIG. 1, and FIG. 3 is the right side in FIG. FIG.

In the drawing, a frame 1 comprises an upper saw wheel storage chamber 2 and a lower saw wheel storage chamber 3 formed vertically, and an upper saw wheel 4 and a lower saw wheel 5 are rotatable in the respective saw wheel storage chambers 2, 3. It is pivoted. An endless band saw blade 6 is stretched between the upper saw wheel 4 and the lower saw wheel 5, and the lower saw wheel 5 is driven to rotate by the motor 7, whereby the band saw blade 6 circulates between the saw wheels 4 and 5. A table 8 on which a material is placed is placed on the lower saw wheel storage chamber 3.
Is installed.

The upper saw wheel 4 is hooked on a saw blade tensioning device that applies tension to the band saw blade 6. The saw blade tensioning device includes a tensioner housing 9 fixed to the upper saw wheel storage chamber 2, two slide pipes 10 provided in the tensioner housing 9 in parallel with the moving direction of the upper saw wheel 4, and a slide pipe 10. Hook slider 11 movably loosely fitted and tensioner housing 9
A tensioner shaft 12 having a lower end fixed to an upper portion of a hook slider 11 and a tensioner housing 9
And a spring 13 provided between the handle 13 and the tensioner housing 9. The handle 13 is screwed to the upper end of a tensioner shaft 12 projecting from above.

The arm portion 11a of the hook slider 11 is moved to the upper saw wheel storage room 2
And projecting in a direction substantially perpendicular to the slide pipe 10 outside the tensioner housing 9. A U-shaped groove 1 is provided in which a holder pin 15 projects horizontally from a saw wheel holder 16 which supports the upper saw wheel 4, and the holder pin 15 is formed on the arm portion 11a.
By hooking 1b, the upper saw wheel 4 is attached to the hook slider 11.

When the handle 13 is rotated, the tensioner shaft 12 moves upward, and the upper saw wheel 4 also moves via the hook slider 11 and the saw wheel holder 16, so that the interval between the lower saw wheel 5 and the band saw blade 6 is increased. Empower. When the handle 13 is rotated in the reverse direction, the upper saw wheel 4 moves downward, the distance from the lower saw wheel 5 is reduced, and the band saw blade 6 is loosened.

In the above configuration, the hook slider 11 is provided inside the tensioner housing 9 and the hook of the saw blade tensioning device of the saw wheel 4 is provided outside the tensioner housing 9 (the upper saw wheel storage chamber 2). When the hook is hooked on the U-shaped groove 11b, the hook slider 11 is not deformed, and the upper saw wheel 4 can be easily attached and detached.

[Effect of the invention]

According to the present invention, since the hook slider (sliding portion of the saw blade tensioning device) is not directly deformed when the saw wheel is attached / detached, the operation of the saw blade tensioning device due to the deformation of the sliding portion is defective. Can be prevented.

Further, since the sliding portion is not directly exposed, it is not necessary to attach and detach the upper saw wheel with great care.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view showing an embodiment of a vertical band sawing machine according to the present invention, FIG. 2 is an enlarged view of the vicinity of an upper saw wheel storage chamber of FIG. 1, and FIG. 3 is a right side of FIG. FIG. 4 is an enlarged view around the conventional upper saw wheel storage chamber, FIG. 5 is a right side view of FIG.
FIG. 6 is a sectional view taken along the line AA of FIG. 5, and FIG.
FIG. 4 is a cross-sectional view taken along line B. In the figure, 4 is an upper saw wheel, 9 is a tensioner housing, 10 is a slide pipe, 11 is a hook slider, 11a is an arm portion, 11b is a U-shaped groove, 12 is a tensioner shaft, 15
Is a holder pin, and 16 is a saw wheel holder.

Claims (1)

(57) [Scope of request for utility model registration] 1. A saw blade tensioning device which stretches a band saw blade to a pair of vertically opposed saw wheels and vertically moves an upper saw wheel to apply tension to the band saw blade. Are provided vertically, a hook slider is loosely fitted to the slide pipe so as to be slidable up and down, an arm portion is protruded from the hook slider toward the saw wheel, and the upper saw wheel is detachably attached to the arm portion. A saw blade tensioning device in a vertical band sawing machine, wherein a groove for engaging is provided.