JPH0698561B2 - Wheel rotation drive transmission device in a sharpener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a blade sharpener for polishing a knife such as a knife or a knife, and a grindstone rotating device provided between a rotary shaft of a grindstone and a rotary drive shaft. The present invention relates to a drive transmission device.

(Problems to be Solved by Prior Art and Invention) Conventionally, in this type of sharpener, for example
As disclosed in Japanese Laid-Open Patent Application No. 1793 and Japanese Utility Model Laid-Open No. 59-8752, it has been considered that a rotary shaft of a grindstone is provided with a clearance in the axial direction to facilitate polishing work. In each of these blade sharpeners, the rotary shaft of the grindstone is directly coupled to the rotary drive shaft, and the rotary drive shaft or the electric motor driving the rotary shaft is pressed by the spring so that the grindstone can press the blade. There is. However, since the grindstone is always urged in the axial direction by the spring, vibration during the rotation tends to occur in the axial direction.

In addition, as shown in Japanese Utility Model Publication No. 59-40991, a blade sharpener in which a spring is interposed between the rotary drive shaft and the rotary shaft of the grindstone is also considered, but in the case of this blade sharpener as well, Since there is a spring that biases the grindstone, the same drawbacks as those described above occur.

An object of the present invention is to provide a special cam mechanism between the rotary drive shaft and the rotary shaft of the grindstone to allow the rotary shaft of the grindstone to have a clearance in the axial direction to facilitate the polishing work, To prevent the vibration of.

Structure of the Invention (Means for Solving the Problems) That is, the present invention supports the rotating shaft 2 of the grindstones 5 and 6 so as to be movable in the axial direction thereof, as shown in the drawings of the embodiments described later. A blade provided so that the rotary drive shaft 12 is arranged on the same axis as the rotary shaft 2 and the rotary shafts 2 and 12 are operatively connected to rotate the rotary shaft 2 as the rotary drive shaft 12 is rotationally driven. In the grindstone rotary drive transmission device of the sharpener, one of the two shafts 2 and 12 is provided with a cam projection 14, and the other shaft 2 is provided with the cam projection 14 as the rotary drive shaft 12 is rotationally driven. A cam surface 17 for contact is provided, and in the cam surface 17, when the cam projection 14 is in contact, both shafts 12, 2 rotate relative to each other along with the movement of the rotary shaft 2 in the axial direction, and relatively move in the axial direction. Guide surfaces 18a, 18b that are inclined with respect to the axial direction to allow movement, Stopper surface 19a of the guide surface 18a, is formed continuously to 18b and the relative movement of said axially with the relative rotation of the two shafts 12,2 blocking in a predetermined range, is provided with a 19b.

(Operation) First, when the rotary drive shaft 12 is rotationally driven before the blade is polished, the cam projection 14 provided on one shaft 12 comes into contact with the cam surface 17 provided on the other shaft 2. In this case, as shown in FIG. 3, the cam projection 14 is a stopper surface of the cam surface 17.
When it comes into contact with 19a, 19b, the rotary drive shaft 1
The rotation of 2 is transmitted to the cam projection 14 and the stopper surfaces 19a and 19b, and the rotary shaft 2 of the grindstones 5 and 6 is integrally rotated. On the other hand, when the cam projection 14 comes into contact with the guide surfaces 18a, 18b of the cam surface 17, the cam projections 14 rotate against the guide surfaces 18a, 18b by the component force in the axial direction to rotate the grinding wheels 5, 6. The shaft 2 moves in the axial direction, and the cam projection 14 relatively moves along the guide surfaces 18a, 18b toward the stopper surfaces 19a, 19b and abuts the stopper surfaces 19a, 19b as shown in FIG. Rotation drive shaft 1 in that state
The rotation of 2 is transmitted to the cam projection 14 and the stopper surfaces 19a and 19b, and the rotating shaft 2 of the grindstones 5 and 6 rotates integrally.

Now, when the blade is polished, a force is applied to the grindstones 5 and 6 in the axial direction, so that the rotary shaft 2 of the grindstones 5 and 6 moves in the axial direction, and the movement causes the cam projection 14 to move as shown in FIGS. As shown in, the relative movement is made along the guide surfaces 18a, 18b. When the force applied to the grindstones 5 and 6 by the blade and the reaction force applied to the guide surfaces 18a and 18b by the projection 14 by the rotary drive shaft 12 are balanced, the relative movement between the cam projection 14 and the guide surfaces 18a and 18b disappears. In that state, the rotation of the rotary drive shaft 12 causes the cam projection
It is transmitted to the rotating shaft 2 of the grindstones 5 and 6 via the 14 and the guide surfaces 18a and 18b.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the rotating shaft 2 is provided on one side of the case 1.
Is supported by bearings 3 and 4 so as to be movable in the axial direction thereof, and a pair of grindstones 5 and 6 having different roughnesses are arranged in parallel on the rotary shaft 2. Sword blade insertion openings 7a, 7b, 8a, 8b are formed on the upper surface of the case 1 so as to correspond to both end surfaces of the both whetstones 5, 6. Leaf springs 9 and 10 are attached to the blade insertion openings 7a, 7b, 8a, 8b, and the blades inserted in the blade insertion openings 7a, 7b, 8a, 8b are inserted into the insertion openings 7a, 7b, 8a, 8b. It is designed to be pressed against the inner surface. The blades inserted into the blade insertion openings 7a, 7b, 8a, 8b are whetstones 5, 6
It comes in contact with a part of the outer circumference of the end face of the.

An electric motor (not shown) and a power source (not shown) driven by a switch 11 are housed on the other side of the case 1, and the rotary drive shaft 12 of the electric motor is moved to the rotary shaft 2 side of the grindstones 5 and 6. It is protruding.

A cylindrical connecting portion 13 is attached to the tip of the rotary drive shaft 12, and a pair of cam protrusions 18 are provided on the outer periphery of the connecting portion 13.
They are formed at 0 degree intervals. A cylindrical connecting portion 15 is attached to the tip of the rotary shaft 2 of the grindstones 5 and 6, and the connecting portion 15
The connecting portion 13 of the rotary drive shaft 12 is inserted therein. A pair of notches opened to the tip side of the outer periphery of the connecting portion 15
16 are formed at intervals of 180 degrees, and a V-shaped cam surface 17 is formed in the notch 16. Both cam projections 14 on the rotary drive shaft 12
Both the notches 16 are engaged, and the cam projections 14 come into contact with the cam surfaces 17 as the rotary drive shaft 12 rotates. As shown in FIG. 3, the V-shaped cam surface 17 has guide surfaces 18a, 18b that are inclined with respect to the axial direction of the rotating shaft 2 and both guide surfaces 18a, 18b intersect each other at both guide surfaces. 1
8a, 18b and stopper surfaces 19a, 19b formed continuously, and both guide surfaces 18a, 18b with respect to the axial direction of the rotary shaft 2.
Have the same inclination angle.

Then, for example, the rotation drive shaft 12 rotates and its cam projection
Even when 14 comes into contact with either of the guide surfaces 18a, 18b of the cam surface 17, the cam protrusion 14 does not contact the guide surfaces 18a, 18b.
The rotational force 2 of the grindstones 5 and 6 is moved in the axial direction by the component force in the axial direction that acts on the cam projection 14 and the guide surfaces 18a and 18
It moves relative to the stopper surfaces 19a, 19b side along b and contacts both stopper surfaces 19a, 19b as shown in FIG. In that state, rotation of the rotary drive shaft 12 causes the cam projection 14 and both stopper surfaces 19 to rotate.
The rotation shafts 2 of the grindstones 5 and 6 are integrally rotated by being transmitted to a and 19b. At this time, the whetstones 5 and 6 are located on the center position P between the blade insertion openings 7a and 7b and between the blade insertion openings 8a and 8b.

Now, when the blade is inserted into one of the insertion openings 7a, 8a, the grindstones 5, 6
Since a force in the direction of arrow a in Fig. 1 is applied to the
The 5, 6 rotary shafts 2 move in the direction of the arrow a, and the cam projection 14 relatively moves along one guide surface 18a as shown in FIG. When the force in the direction of the arrow a given to the grindstones 5 and 6 by the blade and the component force in the direction opposite to the arrow given to the one guide surface 18a by the cam projection 14 of the rotary drive shaft 12 are balanced, One guide surface 18a
Relative movement with respect to the grinding wheel 5, 6 in that state, the rotation of the rotary drive shaft 12 through the cam projection 14 and one guide surface 18a
Is transmitted to the rotary shaft 2.

On the other hand, when the blade is inserted into the other insertion opening 7b, 8b, force is applied to the grindstones 5, 6 in the direction of arrow b in FIG. The cam projection 14 relatively moves along the other guide surface 18b as shown in FIG. Then, as in the case described above, the force applied to the grindstones 5 and 6 and the other guide surface 18b
The cam projection 14
And relative movement with respect to the other guide surface 18b disappears, and in that state, the rotation of the rotary drive shaft 12 is transmitted to the rotary shaft 2 of the grindstones 5 and 6 via the cam projection 14 and the other guide surfaces 18a and 18b.

In this way, when a certain amount of force is applied to the grindstones 5 and 6 when polishing the blade, the grindstones 5 and 6 escape, so that the polishing becomes very easy.

Particularly, in the present embodiment, the force applied to the grindstones 5 and 6 by the blade and the reaction force applied to the guide surfaces 18a and 18b of the cam surface 17 through the cam projection 14 by the rotary drive shaft 12 are balanced. By the way, since the rotary drive shaft 12 and the rotary shaft 2 of the grindstones 5 and 6 are integrally rotatably interlocked with each other, the rotation can be surely transmitted without using a spring as in the prior art, The vibration caused by this spring is not generated in the grindstones 5 and 6.

The embodiment described above may be modified as follows.

(A) A cam projection 14 is formed on the rotary shaft 2 of the grindstones 5 and 6, and a cam surface 17 is formed on the rotary drive shaft 12.

(B) One or more cam projections 14 and cam surfaces 17 are formed.

(C) Both guide surfaces 18a, 18b of the cam surface 17 and the stopper surface 19
Of a and 19b, only one guide surface 18a and stopper surface 19b or the other guide surface 18b and 19a is formed.

(D) The entire cam surface 17 is formed into a substantially arc shape.

Effects of the Invention In short, according to the present invention, when a certain force or more is applied to the whetstones 5 and 6 when polishing the blade, the whetstones 5 and 6 escape.
Not only polishing becomes very easy, but also the force applied to the grindstones 5 and 6 by the blade and the guide surface of the cam surface 17 via the cam projection 14 by the rotary drive shaft 12 without using a spring unlike the prior art. When the forces applied to 18a and 18b are in balance, both shafts 12 and 2 are interlocked so that they can rotate integrally, and the rotation of rotary drive shaft 12 can be reliably transmitted to rotary shaft 2 of grinding wheels 5 and 6. Therefore, the vibration caused by this spring is not generated in the grindstones 5 and 6.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a sword sharpener according to this embodiment, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. 3 shows a rotary drive shaft before polishing a blade. A partially enlarged plan view of FIG. 1 showing a rotated state, and FIGS. 4 and 5 are views corresponding to FIG. 3 when the blade is being polished. 2 ... Rotary axis, 5,6 ... Whetstone, 12 ... Rotation drive axis, 14 ...
… Cam protrusion, 17 …… Cam surface, 18a, 18b …… Guide surface, 19
a, 19b …… Stopper surface.

Claims (1)

[Claims] 1. A rotating shaft (2) of a grindstone (5, 6) is movably supported in its axial direction, and a rotary drive shaft (12) is arranged on the same axis as this rotating shaft (2). Both shafts (2,
In the grindstone rotation drive transmission device for a sharpening tool, which is provided so as to rotate the rotary shaft (2) according to the rotary drive of the rotary drive shaft (12) by operatively connecting the two shafts (2, Of the 12), a cam projection (14) is provided on one of the shafts (12), and the cam surface on which the cam projection (14) abuts on the other shaft (2) as the rotary drive shaft (12) is rotationally driven. (17) is provided, and when the cam projection (14) is in contact with the cam surface (17), both shafts (12, 2) rotate relative to each other as the rotary shaft (2) moves in the axial direction. And guide surfaces (18a, 18b) oblique to the axial direction so as to allow relative movement in the axial direction, and the guide shafts (18a, 18b) formed continuously with the both shafts. A stopper face (19) that prevents relative movement in the axial direction due to relative rotation of (12,2) within a certain range.
a, 19b) is provided, a grindstone rotation drive transmission device in a blade sharpener.