JPS588321B2 - Saw blade lifting device for scroll saw machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a saw blade lifting device for a scroll saw machine.

Conventionally, as shown in FIG. 6, in the saw blade lifting device, a lifting cylinder 36 is tightened and fixed at the tip of a fixed arm 35, a movable shaft 37 is inserted through the lifting cylinder 36, and a lifting spring 38 is used to lift the saw blade. When urging the saw blade 39 upward and clamping the lower end of the saw blade 39 to the lower blade stop 41 directly below the table 40, use the operating lever 42 to move the forefeed movable shaft 37 to the distance between the lower end of the saw blade 39 and the lower blade stop 41. It was configured to move only H downward.

For this reason, it is not only necessary to project the movable shaft 37 from the upper end of the lifting cylinder 36 by at least the distance H, but also to prevent the vertical movement of the guide slider 43 for compressing the lifting spring 38 installed in the lifting cylinder 36. The stroke also needs to be the distance H, so the lifting tube 36 and the movable shaft 37 have to be that long.

If the protruding length of the movable shaft 37 from the upper surface of the lifting cylinder 36 becomes longer, its own weight increases and its inertia also increases, resulting in a delay in vertical movement and severe lateral vibration of the saw blade 39. As a result, the saw blade This has the disadvantage that it is easy to break, which hinders stable, high-precision work, and also promotes wear and tear on parts.

Furthermore, when the operation lever 42 is moved downward, it is necessary to operate it against the elasticity of the suspension spring 38 having a large spring constant from the beginning, so there is also the drawback that labor is wasted each time the saw blade is clamped. Ta.

In addition, if the saw blade breaks during work, the movable shaft 37
The suspension spring 38 caused the upper end of the lever to suddenly rise and collide with the lower surface of the push-down lever 42, producing a loud impact sound and receiving a mechanical impact, resulting in wear and tear on the members.

The object of the present invention is to provide a scroll saw machine that eliminates the above-mentioned various conventional defects, shortens the length of the lifting tube and movable shaft, allows stable work to be performed, is easy to manufacture, and has improved durability. An object of the present invention is to provide a saw blade lifting device.

Hereinafter, an embodiment of a scroll saw machine embodying the present invention will be described with reference to the drawings. In the drawings, 1 is a bed, 2 is a fixed table having an insertion hole 4 for a scroll saw blade 3, and 5 is a portion below the insertion hole 4. This is a lower 4-part blade stop that is reciprocated in the vertical direction by the drive mechanism 6 and for automatically clamping and fixing the lower end of the jig saw blade 3.

Reference numeral 7 denotes a fixed arm, 8 a saw blade guide arranged to be retractable from the scroll saw blade 3 by a saw blade guide retraction mechanism 9 fixed to the lower surface of the tip of the arm 7, and 10 a pivot support also fixed to the front end surface of the arm 7. It is a cylinder, and a keyway 10a is formed in the inner peripheral surface of the cylinder 10 near the arm 7 in the axial direction.

Reference numeral 11 denotes a cylindrical movable lifting tube with a cylindrical sleeve 12 fitted and fixed in its lower half, and the sleeve 12 has a long hole 12a in the axial direction through which a key 13 is fitted. same key 1
3 is fixed to the movable lifting tube 11 with two bolts 14.

A movable lifting cylinder 11, a sleeve 12, and a key 13, which are integrally connected to the shaft support cylinder 10 by bolts 14, are inserted into the shaft support cylinder 10 so as to be movable in the vertical direction.

Reference numeral 15 denotes a collar member 17 fitted near the upper end of the movable lifting cylinder 11 and fixed with bolts 16, and the upper surface 10b of the shaft support cylinder 10.
A coil-shaped first suspension spring is interposed between the movable suspension tube 11 and the members attached to the tube 11 against its own weight.

18 is a short cylindrical washer that is inserted and locked in a stepped portion 11a provided near the lower end of the inner circumferential surface of the movable lifting tube 11 so as not to be able to move upward; 19 is a short cylindrical washer whose upper end is attached to the cylindrical portion 1 of the washer 18;
8a, and the lower end surface of the lower end screw portion 1 of the movable lifting tube 11.
It is a cylindrical bearing that is pressed upward and tightened and fixed by a tightening knob 20 screwed into the cylindrical shaft, and has a guide hole 19a with a square cross section formed in the axial direction.

Reference numeral 21 denotes a movable shaft for attaching a jig saw blade, which is shaped like a regular square prism and penetrates through the guide hole 19a of the bearing 19 and has an upper blade stop 22 fixed to its lower end.
A guide slider 23 to be fitted into the guide slider 1 is attached to the pin 24.

Reference numeral 25 denotes a second suspension spring having a coil shape and having a larger spring constant than the first suspension spring 15, which is interposed between the washer 18 and the guide slider 23, and is connected to the movable shaft 21.
is lifted upward against its own weight.

Reference numeral 26 denotes a cap screwed onto the upper end screw portion 11c of the movable lifting cylinder 11, and a buffer member 27 is fixed to the lower surface of the cap.

As shown in FIG. 1, 28 is a lever guide fixed to the top surface of the tip of the fixed arm 7, 29 is a lever post fixed to the lever guide 28, and 30 is an operating lever rotatably supported on the same post 29. Then, the movable shaft 21 can be moved downward by pressing the buffer member 31 fitted to the upper end of the movable shaft 21.

Next, the operation of the scroll saw constructed as described above will be explained.

Now, in order to automatically clamp the lower end of the jig saw blade 3 fixed to the upper blade stop part 22 by the lower blade stop part 5, press a switch (not shown) provided at the tip of the operating lever 30. At the same time, move the operating lever 30 downward to open the movable shaft 2.
Press down on 1.

Then, since the second suspension spring 25 has a larger spring constant than the first suspension spring 15, the second suspension spring 25 is moved downward by the guide slider 23 without being compressed, and this downward force is applied to the washer 18 and the bearing. 19, tightening knob 20,
The first suspension spring 1 is connected to the movable suspension cylinder 11 and the collar member 17.
5, and only the spring 15 is compressed.

Therefore, each member such as the movable lifting cylinder 11 and the movable shaft 21 is moved down as one while maintaining the relative positional relationship, and the collar member 1
The lower surface of 7 is the upper surface 10b of the shaft support cylinder 10 as shown in FIG.
When it comes into contact with , the movable lifting cylinder 11 is stopped.

Further, when the operating lever 30 is lowered, the second suspension spring 25 is compressed by the guide slider 23, and the movable shaft 21 is moved downward as shown in FIG.

In this state, the lower end of the scroll saw blade 3 is inserted into the opening of the lower blade stop 5, so the switch of the operating lever 30 (not shown)
is cut, the lower blade retaining part 5 is closed, and the jig saw blade 3 is automatically clamped.

Once this is done, the starting switch (not shown) is turned on to operate the drive mechanism 6, and the saw blade 3 is moved up and down by the same length as the extension/contraction stroke of the second suspension spring 25 to perform the cutting operation.

Now, in the present invention, the movable lifting tube 11 is inserted through the shaft supporting tube 10 so as to be able to move up and down, the lifting tube 11 is supported by the first lifting spring 15, and the movable lifting tube 11 is movable inside the lifting tube 11. Since the shaft 21 is inserted through and supported by the second suspension spring 25, the movable suspension tube 11 and the second suspension spring 25 are shortened by the same length as the vertical movement stroke of the movable suspension tube 11. In addition, the length of the movable shaft 21 can be shortened by twice the length of the stroke.

That is, as shown in FIG.
If the stroke of the guide slider 23 is set to 1/2 of the stroke H of the scroll saw blade 3, the lengths of the lifting cylinder 11 and the second lifting spring 25 can be shortened by H/2. At the same time, the length of the movable shaft 21 can be shortened by the length H obtained by adding the shortened length H/2 of the movable lifting tube 11 to the stroke H/2 of the movable lifting tube 11.

For this reason, the protrusion length of the movable shaft 21 to the top of the movable lifting cylinder 11 is shortened by H compared to the conventional one, so that the movable shaft 21 can be used during work.
It is possible to perform stable cutting work by reducing the horizontal vibration of the machine.

Furthermore, in the present invention, since the movable shaft 21 can be shortened, machining accuracy can be improved, and
The weight of the movable shaft 21 can be reduced to reduce the inertia force, and therefore the load on the scroll saw blade 3 can be reduced, and the strength of the movable shaft 21, the bearing 19, the movable lifting cylinder 11, etc. can be reduced. .

Furthermore, in the present invention, since two suspension springs 15 and 25 are used, when the guide slider 23 is moved upwardly by the second suspension spring 25 during the cutting operation, the cap 26, which is elastically supported by the first suspension spring 15, Therefore, the impact can be alleviated.

In addition, in the embodiment of the present invention, the spring constant of the first lifting spring 15 is made weaker than that of the second lifting spring 25, but if this is done, a weak force is initially applied when the scroll saw blade 3 is clamped by the operating lever 30. The lever 30 can be pushed down with the button, and therefore the lever 30 can be operated easily.
When the movable shaft 21 moves upward due to sudden release of clamping of the scroll saw blade 3 by pressing a lever switch (not shown) before the lever has been pressed down or the scroll saw blade is broken, the first lifting spring 15 After the guide slider 23 collides with the cap 26 that is moving upward and the second suspension spring 25 is fully extended, it is moved upward only by the weak first suspension spring 15, so that the shock at the time of the uppermost movement is reduced. become something that can be done.

Further, in the above embodiment, the direction of the scroll saw blade 3 can be adjusted by loosening the tightening knob 20 and rotating the movable shaft 21. However, the bearing 19 is fixed to the movable lifting cylinder 11, and the sleeve 12 and Another sleeve (not shown) into which the key 13 is inserted
may be rotatably inserted into the shaft support cylinder 10 and fixed by tightening with a tightening bolt (not shown).

As described in detail above, the present invention has a movable lifting tube inserted into a shaft that moves vertically with respect to a shaft support tube and supported by a first lifting spring, and a movable lifting tube for mounting a scroll saw blade. By penetrating the movable shaft so that it can move in the vertical direction and supporting it by the second lifting spring, the length of the movable shaft protruding from the lifting tube and the upper end of the lifting tube is shortened, and the weight of the movable part is reduced. At the same time, due to the reduction in inertia, the horizontal vibration of the saw blade is reduced, allowing stable and precise cutting work to be performed, as well as reducing the impact caused by the upward movement of the movable axis, thereby reducing wear and damage on related parts. There are effects such as being able to.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a scroll saw machine according to the present invention;
Fig. 2 is an enlarged vertical sectional view showing the saw blade lifting device, Fig. 3 is a side view showing the movable lifting cylinder in its lowest position, and Fig. 4 shows its movable shaft in its lowest position. FIG. 5 is a schematic vertical cross-sectional view of a lifting device, and FIG. 6 is a schematic vertical cross-sectional view of a conventional lifting device. Axial support tube...10, Movable lifting tube...11
, First suspension spring...15, Flange member...
17. Movable axis...21. Second suspension spring...
...25.

Claims (1)

[Claims] 1. A movable lifting tube is inserted into the shaft supporting tube so as to be movable in the vertical direction and supported by a first lifting spring, and the movable lifting tube is provided with a movable shaft for attaching a scroll saw blade. A saw blade lifting device 2 for a scroll saw machine, characterized in that the saw blade is inserted through the saw blade movably in the vertical direction and supported by a second lifting spring.The spring constant of the second lifting spring is larger than that of the first lifting spring. A saw blade lifting device for a scroll saw machine according to claim 1. 3. The saw blade lifting device for a scroll saw machine according to claim 1, wherein the movable lifting cylinder is inserted into the shaft support cylinder in a non-rotatable manner by a key. 4. The first suspension spring is interposed between the upper surface of the shaft support tube and the collar member fitted and fixed to the upper part of the movable suspension tube. Upper device. 5. The movable shaft is supported by a bearing inserted into the lower part of the movable lifting cylinder so as not to be relatively rotatable, and the bearing is screwed into the step part provided near the lower end of the inner peripheral surface of the movable lifting cylinder and the lower part of the movable lifting cylinder. 2. A saw blade lifting device in a scroll saw machine according to claim 1, which is clamped between the saw blade and the tightening knob.