JP2829714B2 - 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, such as a circular saw or a cutter, for cutting a workpiece by guiding a rotating saw blade with a base.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a circular saw, in which a saw blade 2 is used.
The main body 20 provided with the base member 1 can be rotated by a pin 25 at the front end of the blade case 22 in the cutting direction (right side in the figure) to the front end of an angular guide 24 for changing the cutting angle, which is axially attached to the front end of the base 23. While the rear end is connected by a thumb screw 28 to a depth guide 27 as a guide member connected to the rear end of the base 23 with a rivet 26 or the like. Therefore, the rear end of the blade case 22 is slid along the depth guide 27, and the depth guide 27 is
By fixing the saw blade 21 at an arbitrary position, the protruding amount of the saw blade 21 from the base 23 is changed as shown by the two-dot chain line in FIG.

[0003]

However, in the above structure, the rear end of the blade case 22 and the depth guide 27 are not provided.
The dimension A from the contact a to the pin 25 to the pin 25 and the dimension B from the contact b between the rear end of the base 23 and the depth guide 27 to the pin 25, that is, the turning radius of the two contacts are determined by each component (blade case, angular guide, They do not always match due to dimensional tolerances of the base etc.). Therefore, when the contact a is located behind the contact b, that is, when the dimension B is smaller than the dimension A, the thumb screw 28
When the contact a is forward of the contact b, that is, when the dimension B is larger than the dimension A, the sliding between the depth guide 27 and the blade case 22 is smooth. Will not be
In particular, when the depth of cut is increased, the depth guide 27 interferes with the inner peripheral surface of the blade case 22, and it becomes difficult to set the depth of cut deeply.

[0004]

Therefore, according to the present invention, the operation of the blade case and the base at the time of adjusting the cutting amount does not affect the cutting accuracy, even if an error occurs between the turning radii of the two contacts. The present invention provides a cutting machine that can be performed with good operability, and its configuration is to provide a gap at a connecting portion between a rear end of a base and a guide member so that a connecting portion of the guide member can finely move forward and backward in a cutting direction. It is characterized by having been provided. Further, the gap can be set by the length of the shaft portion of the rivet connecting the rear end of the base and the guide member.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory front view of a circular saw 1. A main body 2 includes a saw blade 3 rotated by a motor (not shown),
It has a blade case 4 that covers the outer half circumference of the saw blade 3, and a rectangular base 5 is arranged below the blade case 4. The base 5 is rivet 6 forward in the cutting direction (to the right in the drawing).
The front end of the blade case 4 is axially attached to the angular guide 7 by a spring pin 8, so that the blade case 4 is attached to the angular guide 7 in a direction perpendicular to the cutting direction around the rivet 6. Tilt and rotation in the vertical direction around the spring pin 8 are possible. On the other hand, at the rear end of the base 5, FIG.
As shown in FIG. 2, a depth guide comprising a guide portion 12 having a slit 11 at the center and curved along the inner surface of the blade case 4 and a folded portion 13 having a base end of the guide portion 12 bent at a substantially right angle. 10 are provided. Depth guide 10
Is rotatably mounted on a base end 12a of the guide portion 12 with a rivet 9 and is rotatable.
a is slightly longer, and has a gap t (a gap large enough to absorb the tolerance of each component) so that the base end 12a of the depth guide 10 to be axially attached can move back and forth. Further, the folded portion 1
Numeral 3 denotes a nut (not shown) welded to the tip end of which is screwed into a thumbscrew 14 through an arc-shaped slit of a guide plate 5a at the rear end of the base 5, so that the thumbscrew 14 and the angular guide 7 are connected. The screw blade 7a to be screwed makes it possible to fix the saw blade 3 at the time of tilting. Further, a bolt 15 is inserted through the slit 11 formed in the guide portion 12 of the depth guide 10 into the fixing portion 4a at the rear end of the blade case 4, and the bolt 15 is prevented from rotating as a rectangular portion 15b. The case 4 protrudes rearward, and a knob nut 17 is screwed into a tip of the case 4 via a spring washer 16. Further, on the inner surface of the blade case 4, there are formed steps 18, 18 which come into contact with both ends in the longitudinal direction of the guide 12, and when the knob nut 17 is loosened, the bolt 1
5 can move along the guide portion 12 so that the main body 2 or the base 5 can be rotated around the spring pin 8. When the knob nut 17 is tightened at an arbitrary position, the head 15 a of the bolt 15 and the step The guide portion 12 is clamped and fixed by the portions 18, 18 and integrated with the blade case 4, and the base 5 is fixed at an arbitrary projecting position of the saw blade 3 from the base 5.

In the circular saw 1 constructed as described above, the base 12a of the depth guide 10 can be finely moved back and forth in the cutting direction by the gap t between the rivets 9 on which the depth guide 10 is mounted. Due to dimensional tolerances of the blade case 4, the angular guide 7, the base 5, and the like, and errors in forming and processing, etc., the radius of rotation of the contact point a between the blade case 4 and the depth guide 10 due to the bolt 15 becomes larger than the base 5 and the depth guide. Even if the rotation radius does not coincide with the rotation radius of the contact point b, the error can be absorbed. That is, as shown in FIG. 3, the displacement of the contact a to the rear side is caused by the approach of the contact a to the contact b at the time of the tightening of the knob nut 17 and the adjustment of the depth of cut, so that the base end 12 a becomes the shaft of the rivet 9. 9a, the contact a moves forward as indicated by a two-dot chain line, and the forward displacement of the contact a is caused by the approach of the contact a to the contact b.
2a will move forward like the dashed line,
It does not cause deformation of the base 5 or deterioration of operability due to excessive rubbing between the depth guide 10 and the blade case 4. Of course, since the depth guide 10 has a sufficient thickness, the required strength can be ensured and the cutting accuracy is not affected. Even if the base end 12a can move back and forth as described above, there is no rattling in the vertical direction, so that the stability in the fixed state of the knob nut 17 is sufficiently obtained. The same applies to the case where the folded portion 13 is not provided in the depth guide 10.

The setting of the gap t can be appropriately increased or decreased in addition to the above-described embodiment in accordance with the size of the cutting machine and the like. The setting of the gap t is possible.

[0008]

As described above, according to the present invention, the gap allows the connecting portion of the guide member to be finely moved back and forth in the cutting direction, so that there is an error between the turning radius of the contact point of the blade case to the guide member and the contact point of the base. Can be absorbed here.
Therefore, good operability is obtained without affecting the sliding between the rear end of the blade case and the guide member at the time of adjusting the cutting depth. In addition, the base does not deform at the time of fixing, and the thickness of the guide member can be sufficiently obtained, so that there is no influence on the cutting accuracy. Further, if the gap is determined by the length of the shaft portion of the rivet connecting the rear end of the base and the guide member, the gap can be easily set.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a circular saw machine.

FIG. 2 is an explanatory diagram of a rear portion of a base.

FIG. 3 is an explanatory diagram showing movement of a contact point b when adjusting a cutting amount.

FIG. 4 is an explanatory view of a conventional circular saw machine.

[Explanation of symbols]

1. Circular saw machine, 2. Body, 3. Saw blade, 4. Blade case, 5. Base, 7. Angular guide, 8
··· Spring pins, 9 ·· rivets, 10 ·· depth guides, 11 ·· slits, 12 ·· guide parts, 15 ·
・ Bolts, 17 ・ knob nuts.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23D 45/00-47/12 B27B 5/20 B27B 9/02

Claims (2)

(57) [Claims] 1. A front end of a base is rotatably attached to a front end of a blade case having a disc-shaped saw blade, while a rear end of the base extends along a peripheral surface of the blade case. A cutting machine in which the protruding amount of the saw blade from the base can be adjusted by connecting the guide member to be fixed and sliding the rear end of the blade case with respect to the guide member and fixing it at an arbitrary position. A cutting machine, characterized in that a gap is provided at a joint between the rear end of the base and the guide member so that the joint of the guide member can finely move back and forth in the cutting direction. 2. The cutting machine according to claim 1, wherein the gap is set by a length of a shaft portion of a rivet connecting the rear end of the base and the guide member.