JPS6018257Y2 - Band saw blade guide on band saw machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a band saw blade guide that is installed on both sides of the cutting portion of the band saw blade of a band saw machine and that clamps and guides the band saw blade so that it faces in the direction of cutting into a workpiece.

Generally, in this type of guide, a fixed side tip that contacts the rear surface of the bandsaw blade when viewed from the front of the bandsaw machine is fixed to the inside of the lower part of the bracket arm, and a movable side tip that contacts the front surface of the bandsaw blade is fixed to the inside of the lower part of the bracket arm. It is movably attached via a push spring and has a structure that elastically clamps and guides the band saw blade.
Conventionally, as disclosed in Japanese Utility Model Publication No. 47-2966, the pressing part at the front end of this saw push spring was displaced by a knurled screw, so even if you forgot to tighten the knurled screw, you could easily cut the band saw. There were drawbacks to driving.

Also, conventionally, Utility Model Application Publication No. 54-57592 or Utility Model Application No. 5
As disclosed in Japanese Patent No. 4-162991, a structure in which a movable side tip can be moved toward and away from a fixed side tip by rotating an operating lever has been proposed, but the number of parts that are in a fitting relationship with each other has been proposed. Not only does this increase manufacturing costs, but the saw push spring is at maximum tension when holding the band saw blade, which requires a long time, and is relaxed when removing the band saw blade, which requires a short time. There was sex.

In addition, in all of the above cases, the saw push spring must be strong because it directly presses the movable side tip, and this has the disadvantage that a considerable amount of force is required to rotate the knurled screw or the operating lever. .

Furthermore, in any of the above cases, when band saw blades of different thicknesses are attached, the amount of deflection of the saw pushing spring changes, and therefore the pushing force fluctuates.

The purpose of this invention is to use a small spring with a weak pressing force to guide and hold the band saw blade while sufficiently pressing it, to easily adjust it to changes in the thickness of the band saw blade, and to reduce the amount of time required. The spring is set to the maximum tension when removing the band saw blade for a short period of time, and is slightly relaxed when the band saw blade is held for a long time, i.e. during normal operation, to ensure the durability of the spring.Furthermore, the band saw blade can be attached and removed by rotating the operating lever. To provide an improved bandsaw blade guide that prevents forgetting to tighten and allows easy rotation of an operating lever.

Hereinafter, the present invention will be explained based on drawings of embodiments.

In this specification, the direction perpendicular to the cutting direction of the band saw blade and the front side when viewed from the front of the band saw machine is referred to as the front, and the opposite side is referred to as the rear, and the surfaces facing forward and rear are respectively referred to as They are called the front and back surfaces.

FIG. 1 is a front view showing the entire embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a longitudinal sectional view of FIG. 2.

Saw wheels 5 and 6 are installed on the left and right sides of a saw frame 4 that moves up and down along a main column 2 and a sub-column 3 established on a bed 1, and a band saw blade 7 is suspended from the saw wheels.

A pair of band saw blade guides 9 and 10 are provided on both sides of the cutting portion 8 of the saw blade 7, and the band saw blade 7, which is oblique or horizontal at the lower sides of the saw wheels 5 and 6, is placed in the cutting portion 8. It is held in the cutting direction into the work material, usually in the vertical direction.

The band saw blade guides 9 and 10 are provided at the lower ends of bracket arms 11 and 12 that hang down from the top of the saw frame 4.

Band saw blade guides 9 and 10 are made symmetrically and have the same structure, so only 10 will be described.

A fixed side chip 22 is fixed by a bolt 23 to the second half of a rectangular groove 21 carved in the left-right direction on the lower end of the bracket arm 12, and a movable side chip 24 is fixed to the first half of the square groove 21.
The band saw blade 7 is supported by an anti-slip pin 25 so as to be slidable in the front and rear direction, and the band saw blade 7 is held between the side tips 22 and 24, and the back tip 26 is in contact with the back of the band saw blade.

A hole penetrating in the front-rear direction is cut into the front part of the bracket arm at the center of the front of the movable side tip 24, and a side pin 27 that is slidable in the axial direction is fitted into the hole, and the front half of the side pin is attached to the bracket. It protrudes from the front face 28 of the arm.

A bearing pedestal 29 is formed protrudingly on the front surface 28 of the bracket arm, and a fulcrum pin 30 whose axis is in the left and right horizontal direction is located further below the center of the side pin 27 on the bearing pedestal.
A main lever 31 is provided which rotates in the direction of arrow A using this fulcrum pin 30 as a fulcrum.

At the upper end of the main lever 31, which is the force point, a saw push spring 33 is interposed between the spring retainers 32 embedded in the front surface of the bracket arm 28, and at the side pin position, which is the point of action, it is coaxial with the side pin 27. An adjustment screw 34 is provided on the top and the adjustment screw is fixed with a circular lock nut 35, and due to the restoring force of the saw push spring 33, the rear surface of the adjustment spring 34 comes into contact with the front end surface of the side pin 27 and presses it.
The rear end surface of the movable side tip 24 is configured to abut against and press the front surface of the movable side tip 24.

Note that the distance from the fulcrum of the main lever 31 to the point of action is h1, and the distance from the fulcrum to the point of force is Ll.

A recess 36 is formed on the back of the central part of the main lever 31. A cam 37 for pushing up and separating the main lever 31 from the recess is supported on the upper end of the bearing stand 29, and the right end of the cam shaft An operating lever 38 is fixed to the cam 37 so that the cam 37 can be rotated.

The shape of this cam 37 is, for example, as shown in the figure on the operating lever 3.
8 is tilted downward, the half-moon-shaped notch plane approaches the recess 36 with a slight gap, and when the lever 38 is pulled up forward as shown by arrow B, the main part resists the force of the saw push spring 33. The lever 31 is formed to rotate forward.

In such a configuration, when the operating lever 38 is tilted downward, the restoring force of the saw pushing spring 33 is expanded at a ratio of L/L2, and is used as a pushing force of the movable side tip 24 via the side pin 27. This acts to press and clamp the bandsaw blade 7.

If band saw blades of different thicknesses are to be installed, the clamping force can be easily readjusted to the same value by displacing the adjusting screw 34 in the front-rear direction in this state.

When the operating lever 38 is pulled up, the cam 37 pushes up the recess 36 of the bearing stand 29, the saw push spring 33 is compressed, and the main lever 31 is rotated forward about the fulcrum. The pressing force acting on the side pin 27 is released, and the bandsaw blade 7 can be freely removed.

In the above embodiment, the fulcrum, the force point, and the point of action of the main lever 31 are arranged in a straight line 5, and the straight line is set in the vertical direction, but the present invention is not limited thereto, and can be moved in any direction. It can be implemented.

According to the present invention, the point of action is provided near the fulcrum of the main lever, and the force point is provided with a saw push spring, so the restoring force of the saw push spring is about a fraction of the band saw blade clamping force. Similarly, by applying a small amount of force to the operating lever, the main lever can be displaced against the spring.

In addition, since the pressing force of the side pin provided at the point of action of the main lever can be easily adjusted from the outside using an adjustment screw, it is extremely easy to maintain the pressing force at the same value even when using saw blades of different thickness. It's easy.

Furthermore, the saw push spring is in a slightly relaxed state when the band saw blade is held for a long time, and the saw push spring is in the maximum tension state only when removing the band saw blade (11), so the durability of the saw push spring is extended. It has the effect of being able to be used stably for a long time.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the entire embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a longitudinal sectional view of FIG. 2. 7... Band saw blade, 9, 10... Band saw blade guide, 11.12... Bracket arm l4.2
2... Fixed side tip, 24... Movable side tip, 27... Side pin, 30...
...Fullin bin, 31 ...Main lever 33
... Saw push spring, 34 ... Adjustment screw,
37...force t4.38...operation lever.

Claims (1)

[Scope of utility model registration request] The lower end of the bracket arm installed on both sides of the cutting part of the band saw machine, the fixed side tip that comes into contact with the rear surface of the band saw blade when viewed from the front of the band saw machine, and the movable side tip that comes into contact with the front surface of the band saw blade and can be displaced in the front-rear direction. In a device that clamps and guides a traveling bandsaw blade with a side tip attached so that the cutting edge faces in the direction of cutting into the workpiece, the inside of the through hole that passes from the front surface of the movable side tip to the front surface of the bracket arm is A sliding side pin is provided, and the rear end surface of the side pin is brought into contact with the front surface of the movable side chip, and a main lever that rotates around an axis parallel to the front surface of the bracket arm is attached to the front surface of the bracket arm. The rear surface of the main lever or a member fixed to the main lever is provided so as to come into contact with the front end surface of the side pin, and the side pin is connected to the side pin on an extension of a line passing from the shaft of the main lever to the side pin contact area. A spring is provided to apply a pressing force, and an operating lever is provided to displace the main lever forward against the force of the spring, and when the band saw blade is held between the fixed side tip and the movable side tip, A band saw in a band saw machine configured such that the force of a spring is amplified by the main lever to press the side pin, and the pressing force of the side pin is released by operating the operating lever so that the movable side tip can be separated from the band saw blade. Blade guide.