JPH0219206Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a chamfering machine that chamfers a corner of a workpiece while moving the machine along the corner.

(Prior art) As shown in Utility Model Publication No. 56-29037, for example, a conventional chamfering machine has a movable guide device attached to the side surface of the grinder, and the position of the guide device's backing plate and the grinder is adjustable. By adjusting the relationship, the amount of chamfering could be set freely.However, since the backing plate was structured so that it could only perform its function on flat surfaces, If the section is curved or relatively long, the work must be done in an unstable condition, resulting in a disadvantage that the chamfer angle tends to vary. Moreover, in this type of chamfering machine, the direction of the guide device is fixed with respect to the grinder, so the working conditions can become even more unstable depending on the size of the work area or the difference in the working arm of the worker. was causing the situation. Furthermore, the guide device is attached to the main body with multiple screws, so if you want to remove the guide device from the main body when replacing the grinding wheel of the grinder or performing other maintenance work, you must loosen and remove multiple screws each time. Furthermore, the work efficiency of the chamfering machine was low in terms of maintenance work.

(Problems that the invention aims to solve) This invention solves the problem that with conventional chamfering machines, not only the chamfering work becomes extremely unstable, but also the work efficiency of the chamfering machine itself is reduced in terms of maintenance work. This was done in view of the drawbacks that it had, and it allows you to easily adjust the direction of the handle with respect to the backing plate in a direction that is easy to work with, and also allows you to freely set the amount of chamfering. Moreover,
The purpose of this invention is to enable chamfering of a desired angle and shape to be performed without variation, and to improve the efficiency of maintenance work.

Structure of the invention (means for solving the problem) As a means to solve the problem, the chamfering machine of the present invention has a chamfering cutting blade fixed to the end of the output shaft provided perpendicularly to the handle. In addition, an eccentric ring is rotatably provided on the outer circumference of the output shaft, and the outer circumference of the eccentric ring is eccentric with respect to the center of the inner circumference. A bracket for fixing is rotatably fitted, and a stopper fitted to the bracket in a centripetal direction is elastically engaged with and disengaged from a circumferential groove formed on the outer circumference of the eccentric ring. The cutting blade has a structure in which the blades are freely engaged with each other, and the cutting edge of the cutting blade projects from the center of the backing plate toward the inner surface of the plate.

(Function) In the present invention, the distance between the corner of the backing plate and the axis of the output shaft is changed by rotating the bracket to which the backing plate is attached in accordance with the scale engraved on the eccentric ring. , adjust the way the cutting edge of the cutting blade fixed to the end of the output shaft protrudes from the inner surface of the backing plate,
Further, by rotating the eccentric ring together with the bracket outside the output shaft, the orientation of the handle portion can be set according to the operator's convenience without changing the amount of chamfering. In addition, if necessary, the stopper on the bracket, which is biased in the centripetal direction,
By retreating against the advancing force and separating the tip of the stopper from the circumferential groove on the outer circumference of the eccentric ring, the bracket and backing plate are removed from the eccentric ring at the same time, and the cutting blade can be replaced. Let's do it.

(Embodiment) In FIG. 1 showing an embodiment of the chamfering machine according to the present invention, this chamfering machine has a handle part 2 which has a built-in motor 1 such as an electric motor, an air motor, an oil motor, etc. The first one attached to the left opening
The casing 5 is comprised of three parts: a housing 3 and a second housing 4 attached to the lower end opening of the first housing 3.

A motor shaft 1A is protruded into the first housing 3, and the center portion of the motor shaft 1A is connected to a ball bearing 6.
A driving bevel gear 7 is fixed to the tip of the motor shaft 1A. In the center of the first housing 3, an output shaft 9 is rotatably supported at the tip of the motor shaft 1A, perpendicular to the motor shaft 1A via a journal bearing 10 and a ball bearing 11.
A driven bevel gear 8 that meshes with the driving bevel gear 7 is fixed to the upper end of the output shaft 9, so that the output shaft 9 rotates at a reduced speed with respect to the motor shaft 1A. Further, the lower end of the output shaft 9 is made to protrude from the lower end opening of the second housing 4, and this protruding portion is formed at an angle of 45° with respect to the axis of the output shaft 9, as shown in FIG. One or more cutting blades 12 can be detachably attached.

Reference numeral 13 denotes an eccentric ring rotatably fitted to the outer circumferential circle of the boss portion 4A of the second housing 4. The inner circumferential circle 13A of the ring 13 is concentric with the output shaft 9, but the outer circumferential circle 13B is eccentric with respect to the axis of the coaxial shaft 9 (only G in FIG. 1). The eccentric ring 13 is prevented from falling off from the second housing 4 by supporting the lower surface of the ring 13 by a stop ring 14 fitted to the lower part of the second housing 4. 4B is the boss portion 4A of the second housing 4
The push screw 1 is inserted from the outer periphery of the eccentric ring 13 toward the circumferential groove 4B.
5 is screwed together, and the tip of the screw 15 is engaged with the circumferential groove 4B, so that the eccentric ring 13 can be fixed at a predetermined rotational position after being rotated by a predetermined angle in the circumferential direction on the boss portion 4A. It's getting old.

16 is an outer circumferential portion 13B of the eccentric ring 13.
A support tube 18 is screwed and fixed into through holes 17 bored in one to three locations in the centripetal direction of the bracket 16, and the support tube 18 is rotatably fitted. A stopper 20 is fitted in which the coil spring 19 urges the bracket 16 to advance in the centripetal direction, and the eccentric ring 1
A circumferential groove 21 is formed in the outer circumferential portion 13B of No. 3, and the tip of the stopper 20 is formed into a truncated cone shape.
The bracket 16 is removably engaged with the eccentric ring 13 so that the bracket 16 can be rotated in either the left or right direction outside the eccentric ring 13, and is prevented from falling off from the eccentric ring 13. In addition, the bracket 16 is connected to the knob 22.
By pulling the end of the stopper 20 back from the circumferential groove 21 of the eccentric ring 13, it is possible to separate it from the eccentric ring 13. Further, this bracket 16 has a split ring shape with a slit 23 as shown in FIG.
When the fixing screw 25 is screwed into the fastening part 24 formed by sandwiching the bracket 16 and the slit 23 between the fastening parts 24 is widened or narrowed by turning the same screw 25, the bracket 16
The inner circumferential surface of the eccentric ring 13 and the outer circumferential circular portion 13B of the eccentric ring 13
widen or narrow the gap between the bracket 16 and
It can be fixed in any direction through a full 360° rotation, thereby making it possible to adjust the protrusion of the cutting edge of the cutting blade 12 with respect to the corner of the backing plate 26 described below.

The backing plate 26 is used by being fixed to the lower surface of the bracket 16, and has an L-shaped cross section, and has a vertical plate 26A that is applied to the side surface of the workpiece 30 and a horizontal plate 26B that is applied to the upper surface of the workpiece 30 at a right angle. The cutting edge of the cutting blade 12 attached to the tip of the output shaft 9 projects from an arc-shaped central opening 26C formed at the center thereof.

Note that the backing plate 26 is located on the lower surface of the bracket 16.
A cover 16A for covering the cutting blade 12 covers the cutting blade 12 while maintaining a non-contact state with the cutting blade 12 at a portion located on the back side of the vertical plate 26A.

The scale 28 shown in FIG.
This is a scale for adjusting the amount of chamfering engraved on the outer peripheral surface of the flange portion, and indicates the value that matches the base line 29 engraved on the outer peripheral surface of the bracket 16 as the amount of chamfering.

Next, the operation of the above embodiment will be explained.

First, when setting the amount of chamfering, loosen the fixing screw 25, rotate the bracket 16 around the eccentric ring 13, and align the base line 2 carved on the bracket 16.
9 to the desired position of the scale 28 carved on the eccentric ring 13, the bracket 16 rotates eccentrically with respect to the axis of the output shaft 9, so that the output shaft is aligned with the inner surface of the corner of the backing plate 26 fixed to the bracket 16. The protrusion of the cutting blade 12 on 9 changes in the direction of arrow A or B shown in FIG. 2 depending on the amount of rotation of the bracket 16,
Thereby, the amount of chamfering can be easily adjusted and set. For example, if you want to set the chamfering amount C to 3 mm, all you have to do is rotate the base line 29 of the bracket 16 to the number 3 on the scale 28 carved on the eccentric ring 13. The tapered surface 20A of the base acts to push down the eccentric ring 13 with respect to the bracket 16, so it has the effect of bringing the contact surface between the upper surface of the bracket 16 and the eccentric ring 13 into stronger contact, and thereby the cutting blade The way the number 12 comes out can be made even more stable. After completing the adjustment and setting of the amount of chamfering, the fixing screw 25 is tightened to unite the bracket 16 and the eccentric ring 13.

When changing the direction of the handle part 2 according to the operator's convenience, loosen the push screw 15 and move the handle part 2 around the output shaft 9 while maintaining the fastened state between the bracket 16 and the eccentric ring 13. It is rotated by a predetermined angle, and the backing screw 15 is tightened and fixed to the second housing 4.

After adjusting and setting the amount of chamfering and the orientation of the handle part 2, first, drive the motor 1 and transfer its rotation to the output shaft 9.
is transmitted to rotate the cutting blade 12, and then, with the vertical plate 26A and horizontal plate 26B constituting the backing plate 26 in contact with the corners of the workpiece 30, the chamfering machine itself is moved toward the surface of the paper in Figure 2. If it slides, cutting blade 1
2 along the corner of the workpiece 30.
A 45° chamfer is made. At this time, since the orientation of the handle portion 2 has been adjusted in advance according to the operator's convenience, the backing plate 26 is in a state where it is easy to use the chamfering machine against the workpiece 30, and the vertical plate 26
The bracket 16 is guided by two surfaces A and the horizontal plate 26B, and by rotating the bracket 16, chamfering of a preset amount is uniformly performed, allowing work to be carried out in a stable state.

When removing the cutting blade 12 from the output shaft 9 for replacing or polishing the cutting blade 12, first remove the bracket 16 that covers most of the cutting blade 12.
It is necessary to remove the knob 2 from the eccentric ring 13, but in this case, first loosen the fixing screw 25, then remove the knob 2.
2 and pull the stopper 20 against the elastic force of the compression coil spring 19 to allow the tip of the stopper 20 to escape from the circumferential groove 21 on the eccentric ring 13. This can be easily done by loosening or removing the screws without any tedious work, and as a result, the maintenance work efficiency of the cutting blade is improved.

Effects of the invention The chamfering machine of the present invention can easily and reliably adjust and set the amount of chamfering by rotating the bracket to which the backing plate is integrally attached along the eccentric ring. By rotating them integrally, only the orientation of the handle can be changed according to the operator's convenience without changing the amount of chamfering. Therefore, it is possible to perform stable and accurate chamfering work without causing unevenness in the amount of chamfering or the chamfering angle. Furthermore, when the backing plate and the bracket are removed from the casing and the cutting blade is replaced, Since the stopper that engages with the circumferential groove of the eccentric ring can be moved back from within the groove, it is possible to improve work efficiency in terms of maintenance work for the cutting blade.

[Brief explanation of the drawing]

The drawings show one embodiment of the chamfering machine according to the present invention. Fig. 1 is a front view with the main parts cut away, and Fig. 2 is a partially cutaway view of the backing plate and the bracket that supports the plate. The left side view shown in FIG. 1...Motor, 5...Casing, 9...Output shaft, 1
2... Cutting blade, 13... Eccentric ring, 16... Bracket, 19... Compression coil spring, 20... Stopper, 26... Backing plate, 26A... Vertical plate, 26B... Horizontal plate, 26C... Center opening.

Claims (1)

[Scope of utility model registration request] A cutting blade for chamfering is fixed to the end of the output shaft that is perpendicular to the handle, and an eccentric cutting blade is installed on the outer periphery of the output shaft, with the outer circumference being eccentric to the center of the inner circumference. A ring is rotatably provided, and a bracket for fixing a backing plate is rotatably fitted to the outer circumferential portion of the eccentric ring, and a stopper fitted to the bracket in a centripetal direction is arranged as described above. The cutting blade is elastically engaged and detachably engaged with a circumferential groove formed on the outer circumference of the eccentric ring, and the cutting edge of the cutting blade is further protruded from the center of the backing plate toward the inner surface of the plate. A chamfering machine made by