JPH069906U - Cutting machine - Google Patents

Abstract

(57) [Summary] [Purpose] Prevent the lower guard of the cutting machine from coming into contact with the material to be cut. [Structure] A frame 6 rotates up and down around a first shaft 5 while holding a saw blade 7. The lower guard 12 is rotatably supported by the frame and opens and closes the lower portion of the saw blade. The distal end portion 15b of the link 15 engages with the lower guard, and the proximal end portion 1
5b is rotatably supported by a second shaft 14 parallel to the first shaft. A cam 17 and a cam follower 18 are interposed between the frame and the link. When the frame rotates downward, the lower guard is opened by the engaging action of the cam and the cam follower.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutting machine in which a lower guard automatically rotates to expose a saw blade as the saw blade is rotated toward a material under the saw blade.

[0002]

[Prior art]

 As a cutting machine configured to automatically open a lower guard that covers a saw blade when cutting a material to be cut, there is a cutting machine described in Japanese Utility Model Publication No. 62-5287. The lower guard is rotatably supported on a frame that rotates up and down while holding the saw blade, a link is engaged with the lower guard, and the frame and link are pivotally supported by the same pin on the base. In addition, they are mutually pulled by a tension spring. When cutting the material to be cut, when the frame is lowered, the tension spring acts to draw the link toward the frame, and the link causes the lower guard to rotate in the opening direction. As a result, the exposed saw blade cuts the material to be cut.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional cutting machine, when the lower guard is rotated in the opening direction by the tension spring and the lower guard is opened to some extent, the stopper provided on the frame hits the link, and the link and the frame rotate integrally. After that, the lower guard will rotate while being pushed by the material to be cut. Therefore, the lower guard can only be rotated by contacting the material to be cut, which impairs the smoothness of the cutting work. In addition, the tension spring needs to be strong and large to support the lower guard, but there is a problem that a larger space is required to accommodate such a tension spring.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a frame supported on a base via a first shaft so as to be capable of rotating up and down while holding a saw blade, and rotatably supported by the frame. The lower guard for opening and closing the lower part of the saw blade is engaged with the lower guard at the tip end, and is rotatable at the base end through the second shaft parallel to the first shaft. A link supported on the base; a cam interposed between the frame and the link for rotating the lower guard in the opening direction via the link as the frame rotates downward; A cutting machine configuration that includes a cam follower is used.

[0005]

[Action]

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

The link rotates about two large shafts as a fulcrum, but the rotation is restricted by a cam provided on the link and a cam follower, and the relative position of the frame and the link changes, so that the lower guard Rotate in the opening direction. Also, the lower guard is regulated in the closing direction by the link and is free in the opening direction, so it will rotate in the opening direction when it comes into contact with the material to be cut.

Therefore, the opening amount of the lower guard can be adjusted by the shape of the cam provided on the link. In other words, the lower guard can be brought into contact with the material to be cut at an angle that allows the material to be smoothly rotated, and work can be performed smoothly. Further, a cam shape that allows the lower guard to rotate without contacting the material to be cut is also possible. .

[0008]

【Example】

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 3a and 3b for fixing the material to be cut 2 are provided at predetermined positions on the base 1, and brackets 4a and 4b and the first shaft 5 are provided at other positions on the base 1. The frame 6 is attached via.

The frame 6 is configured to be capable of rotating up and down around the first shaft 5 while holding the saw blade 7, and is constantly moved upward by a torsion coil spring 8 mounted on the first shaft 5. It is jumping up.

A cover 9 for covering the upper portion of the saw blade 7 is fixed to the frame 6, and a handle 10 that is gripped when the frame 6 is pushed downward is fixed. The moving part 11 is attached.

As a result, when the frame 6 is pushed down toward the base 1 against the torsion coil spring 8 while holding the handle 10, the material to be cut 2 gripped by the vise 3a, 3b on the base 1 The rotating saw blade approaches.

A lower guard 12 for covering the lower portion of the saw blade 7 is attached to the cover 9. The lower guard 12 is rotatably supported around the shaft 13 of the saw blade 7 and rotates in either direction to cover the lower portion of the saw blade 7 or rotate 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 4 a on the base 1 in parallel with the first shaft 5, and the base end portion 15 a of the link 15 is connected to the second shaft 14. ing. The link 15 rises from the second shaft 14 toward the lower guard 12 so as to bypass the shaft 13 of the saw blade 7, and its tip 15b serves as a hook.

On the other hand, a pin 16 is planted in the lower guard 12, and the hook 15b of the link 15 is engaged with the pin 16. Also, the lower guard always tries to rotate in the closing direction due to its own weight. Therefore, the hook 15b of the link 15 and the pin 16 can be always engaged with each other while the frame 6 is rotated in the vertical direction unless another force for rotating the lower guard in the opening direction is exerted. ing.

Between the frame 6 and the link 15, there are a cam 17 and a cam follower for rotating the lower guard 12 in the opening direction via the link 15 as the frame 6 rotates downward. 18 is interposed.

That is, the cam 17 is provided at the base end portion 15 a of the link 15, and the cam follower 18 that comes into contact with the cam 17 is pivotally supported by the frame 2. The cam 17 is provided with cam surfaces 17a and 17b for controlling the link 15 and the lower guard 12 so that the tip of the lower guard 12 moves along the loci 19a and 19b shown by the solid lines in FIG. Reference symbols A, B, C, D, and E indicate respective positions ahead of the lower guard 12 on the loci 19a and 19b, and symbols a, b, c, d, and e indicate respective positions beyond the lower guard 12. The respective positions of the cam follower 18 corresponding to A, B, C, D and E are shown. The locus 19a of the loci 19a and 19b corresponds to the opening amount of the lower guard 12 required for cutting the material 2 to be cut, and this corresponds to the cam surface 17a. Also, the locus 19b is after the lower guard 12 has opened the required opening amount, and the tip of the lower guard 12 is a path that smoothly moves away from the workpiece 2 and corresponds to the cam surface 17b. There is.

The locus indicated by reference numeral 20 in FIG. 1 is a case where the support shaft of the frame 6 and the support shaft of the link 15 are aligned with each other as in the conventional case. Then, when the frame 6 is pushed down toward the base 1 side while holding the handle 10 in order to cut the material 2 to be cut, the frame 6 rotates downward with the first shaft 5 as a fulcrum.

Further, the link 15 is interlocked with this, and tends to rotate about the second shaft 14 as a fulcrum. At that time, the link 15 is restricted by the contact between the cam 17 and the cam follower 18, and the link 15 opens the lower guard 12 by a necessary amount 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 so that the tip of the lower guard 12 can smoothly contact the material to be cut or does not contact.

When the cutting of the material to be cut 2 is completed and the pressure on 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 causes the locus 19a, 19b is reversed and returned to the original position to cover the lower part of the saw blade 7.

Embodiment 2 In this embodiment, a protrusion 21 is provided instead of the cam follower 18. The protrusion 21 is fixed to the first shaft 5 fixed to the frame 6, and is rotated together with the rotation of the frame 6 to come into contact with the cam 17 of the base end portion 15a of the link 15. There is.

The lower guard 12 follows the same loci 19a and 19b as in the first embodiment, opens and closes, and moves.

[0022]

[Effect of device]

 Since the present invention has the above-mentioned structure, the cam shape provided on the link allows the lower guard to contact the material to be cut during the cutting operation at a smoothly rotatable angle. It can also be rotated without contacting with, and the work can be facilitated.

Further, since the lower guard is rotated without relying on 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. it can.

[Brief description of drawings]

FIG. 1 shows an embodiment of a cutting machine according to the present invention, and in FIG.
It is a -I line sectional view.

FIG. 2 is a side view of the cutting machine.

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

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

[Explanation of symbols]

 7 ... Saw blade 5 ... 1st axis 1 ... Base 6 ... Frame 12 ... Lower guard 15b ... Tip part 15a ... Base end part 14 ... 2nd axis 15 ... Link 17 ... Cam 18 ... Cam follower

Claims (1)

[Scope of utility model registration request] 1. A frame supported on a base via a first shaft so as to be capable of rotating 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 second end that engages the lower guard at the tip end and is parallel to the first axis at the base end. A link rotatably supported on the base via a shaft,
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 in accordance with the downward rotation of the frame. And a cutting machine.