JP2596277Y2 - Cutting 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 cutting machine in which a lower guard is automatically rotated as a saw blade is rotated toward a workpiece below the saw blade to expose the saw blade.

[0002]

2. Description of the Related Art A cutting machine configured to automatically open a lower guard covering a saw blade when cutting a material to be cut is disclosed in Japanese Utility Model Publication No. Sho 62-5287. This is because the lower guard is rotatably supported by a frame that rotates up and down while holding the saw blade, the link is engaged with the lower guard, and the frame and the link are pivotally supported on the base by the same pin. Together with each other by a tension spring. When cutting the material to be cut, when the frame is lowered, the tension spring acts to pull the link toward the frame, and accordingly, the link rotates the lower guard in the opening direction. As a result, the exposed saw blade cuts the workpiece.

[0003]

However, in the above-described conventional cutting machine, the lower guard is rotated in the opening direction by a tension spring, and when the lower guard is opened to some extent, the stopper provided on the frame hits the link, and the link and the frame are integrated. To rotate. Thereafter, the lower guard rotates while being pushed by the material to be cut. Therefore, the lower guard can only be rotated in contact with the material to be cut, and the smoothness of the cutting operation is impaired. Further, in order to support the lower guard, the tension spring needs to be strong and large, but there is a problem that a larger space is required to accommodate such a tension spring.

[0004]

In order to solve the above-mentioned problems, the present invention provides a base (1) via a first shaft (5) so as to be able to rotate up and down while holding a saw blade (7). ) and the frame (6) supported on a Roagado (12) for opening and closing the lower portion of the supported said saw blade pivotally to the frame (6) (7), it made form the tip portion Ta hook (15
b) Whereas pin (16) of the Roagado (12),
Another force greater than its own weight is applied to the lower guard (12).
The second shaft (1) is engaged so that the engagement can be released when it is actuated, and the base end (15a) is parallel to the first shaft (5).
A link (15) rotatably supported on the base (1) via the link (4), and the lower guard (5) via the link (15) as the frame (6) rotates downward. A structure of a cutting machine including a cam (17) and a cam follower (18) interposed between the frame (6) for rotating the opening 12) in the opening direction and the link (15) is adopted. ing.

[0005]

When the frame is pushed downward during cutting of the material to be cut, the frame rotates downward about the first axis as a fulcrum,
The saw blade approaches the material to be cut.

The link rotates about the second axis as a fulcrum,
Rotation is regulated by a cam provided on the link and a cam follower , and the relative position of the frame and the link changes, thereby rotating the lower guard in the opening direction. In addition, the lower guard is regulated by the link in the closing direction,
Since it is free in the opening direction, it rotates in the opening direction when it comes into contact with the workpiece.

Therefore, the opening amount of the lower guard can be adjusted by the shape of the cam provided on the link. That is, the lower guard is brought into contact with the material to be cut at an angle capable of rotating smoothly, so that the work can be performed smoothly, and a cam shape in which the lower guard rotates without contacting the material to be cut is also possible. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 As shown in FIGS. 1 to 3, this cutting machine has a base 1. Vices 3 a and 3 b for fixing the workpiece 2 are provided at predetermined locations on the base 1, and brackets 4 a and 4 b and the first shaft 5 are provided at other locations on the base 1. The frame 6 is attached.

The frame 6 can rotate up and down around the first shaft 5 while holding the saw blade 7.
Is always jumped up by a torsion coil spring 8 mounted on the shaft 5 of the motor.

A cover 9 for covering the upper portion of the saw blade 7 is fixed to the frame 6, and a handle 10 to be gripped when the frame 6 is pushed downward is fixed.
Is mounted.

As a result, when the frame 6 is pushed down toward the base 1 against the torsion coil spring 8 by holding the handle 10, the workpiece 2 is rotated toward the workpiece 2 gripped by the vise 3a, 3b on the base 1. The inner saw blade approaches.

A lower guard 12 for covering the lower part of the saw blade 7 is attached to the cover 9. The lower guard 12 is supported rotatably around the axis 13 of the saw blade 7,
By rotating in either direction, the lower part of the saw blade 7 is covered, or by rotating so as to overlap the cover 9, the lower part of the saw blade 7 is exposed.

A second shaft 14 is attached to the bracket 4a on the base 1 in parallel with the first shaft 5.
A base end 15a of a link 15 is connected to the second shaft 14. The link 15 is moved from the second shaft 14 toward the saw blade 7.
Is raised toward the lower guard 12 so as to bypass the shaft 13 of FIG.

On the other hand, a pin 16 is implanted in the lower guard 12, and a hook 15b of the link 15 is engaged with the pin 16. In addition, the lower guard always tries to rotate in the closing direction by its own weight. Therefore, hook 1 of link 15
The 5b and the pin 16 can be engaged at all times while the frame 6 rotates in the vertical direction, unless another force acting to rotate the lower guard in the opening direction acts.

A cam 17 and a cam follower are provided between the frame 6 and the link 15 for rotating the lower guard 12 in the opening direction via the link 15 as the frame 6 rotates downward. 18 are interposed.

That is, a cam 17 is provided at the base end 15a of the link 15, and a cam follower 18 that contacts the cam 17 is supported by the frame 6 . The cam 17 has a locus 19a, 1 with the tip of the lower guard 12 indicated by a solid line in FIG.
Cam surfaces 17a and 17b for controlling the link 15 to the lower guard 12 so as to move along the 9b are provided. Symbols A, B, C, D, and E are the trajectories 19a, 1
Reference numerals a, b, c, d, and e denote respective positions of the cam follower 18 corresponding to the respective positions A, B, C, D, and E of the lower guard 12 on the lower guard 12. Is shown. The trajectory 19a of the trajectories 19a and 19b corresponds to the opening amount of the lower guard 12 necessary for cutting the workpiece 2, and this corresponds to the cam surface 17a. The trajectory 19b is a path after the lower guard 12 is opened by a necessary opening amount, and is a path such that the tip of the lower guard 12 moves smoothly avoiding the workpiece 2 and the cam surface 17b.
It corresponds to.

The trajectory indicated by reference numeral 20 in FIG.
This is a case where the support shaft of the frame 6 and the support shaft of the link 15 coincide with each other as in the related art. Thus, the material to be cut 2
When the frame 6 is pushed down to the base 1 side with the handle 10 to cut the frame 6, the frame 6 rotates downward about the first shaft 5 as a fulcrum.

Further, the link 15 is linked to this, and tries to rotate around the second shaft 14 as a fulcrum. At this time, the link 15 is regulated by the contact between the cam 17 and the cam follower 18, and the link 15 opens the required amount of the lower guard 12 while the cam surface 17 a contacts the cam follower 18. While the cam surface 17b is in contact with the cam follower 18, the link 15 holds the lower guard 12 at an angle at which the tip of the lower guard 12 can smoothly come into contact with the material to be cut, or so as not to make contact.

When the cutting of the workpiece 2 is completed and the pressing against the handle 10 is released, the frame 6 rotates upward with the saw blade 7 due to the elasticity of the spring 8, and the lower guard 12 moves along the trajectories 19a and 19b. Back to the original, saw blade 7
Cover the bottom of

Embodiment 2 FIG. 4 shows a second embodiment of the present invention. In this embodiment, a projection 21 is provided instead of the cam follower 18. The projection 21 is provided on the first shaft 5 fixed to the frame 6.
, And rotates with the rotation of the frame 6 so as to come into contact with the cam 17 at the base end 15 a of the link 15.

The lower guard 12 opens and closes and moves by following the trajectories 19a and 19b as in the first embodiment.

[0022]

[Effects of the Invention] Since the present invention has the above-described structure, the lower guard can be brought into contact with the material to be cut at an angle which allows the lower guard to smoothly rotate during the cutting operation by the cam shape provided on the link. Also, it can be rotated without contacting the material to be cut, and the operation can be facilitated. In addition, since there is only one link connecting the base and the lower guard, the structure of the cutting machine is simple, and maintenance and inspection and assembly and disassembly are simplified. Also, the lower guard has another larger than its own weight
When a force is exerted, since the engagement between the pin and the link hook Roagado Charles solutions Roagado, it is possible to prevent breakage of links, etc., also, if the engagement is released Roagado is by its own weight The safety is enhanced because the rotation is always performed in the closing direction.

Further, since the lower guard is rotated without using the tension spring as in the conventional cutting machine, it is not necessary to secure a storage space for the tension spring, and the shape of the lower guard can be simplified accordingly.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a cutting machine according to the present invention.
FIG. 2 is a sectional view taken along line I.

FIG. 2 is an enlarged view of a main part of the cutting machine.

FIG. 3 is a partial sectional view of the cutting machine.

FIG. 4 is a cross-sectional view corresponding to FIG. 1 of another embodiment of the present invention .

[Explanation of symbols]

 7 ... saw blade 5 ... first shaft 1 ... base 6 ... frame 12 ... lower guard 15b ... distal end 15a ... base end 14 ... second shaft 15 ... link 17 ... cam 18 ... cam follower

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B27G 19/02 B27B 5/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A frame supported on a base via a first shaft so as to be able to rotate up and down while holding a saw blade ,
A lower guard rotatably supported by the frame for opening and closing the lower part of the saw blade, and a hook formed at the tip is provided on the lower guard with respect to the pin of the lower guard.
Engagement can be released when another force greater than its own weight is applied
And a link supported on the base rotatably via a second axis whose base end is parallel to the first axis, with the downward rotation of the frame. A cutting machine comprising a cam and a cam follower interposed between the frame and the link for rotating the lower guard in the opening direction via the link.