JPH06339585A - Reciprocating electric shaver inner blade manufacturing method - Google Patents

Abstract

(57) [Summary] [Object] It is an object of the present invention to obtain a method for manufacturing an inner blade of a reciprocating electric shaver which can improve the grinding quality of the inner blade and can be easily manufactured. [Structure] Inner blade base 13 made of synthetic resin, a pair of pressed projections 13a integrally projected from the inner blade base 13, and a part of the inner blade base 13 embedded in the longitudinal direction of the inner blade base 13. An inner blade semi-finished product 11a provided with a large number of inner blade plates 14 arranged side by side at intervals,
Inserting the inner blade semi-finished product 11a to the jig 16 that has a pair of inner blade mount fixtures 20 for fixing the inner blade semi-finished product 11a by pressing the projection 13a to be pressed Grinding process of fixing the periphery of the inner blade plate 14 with the rotating grinding wheel 23 fixed by the tool 20, and grinding the inner blade semifinished product 11a removed from the jig 16 to the pressed projection 13
It is characterized in that the inner blade semifinished product 11a is fixed to the jig 16 in the grinding operation without using an adhesive, provided with a cutting step for separating a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an inner blade of a reciprocating electric shaver.

[0002]

2. Description of the Related Art Reference numeral 4 in FIGS. 10 and 11 denotes an inner blade of a conventional reciprocating electric shaver, which is a mandrel 1 made of a solid metal shaft, and a mandrel 1 embedded therein. An inner blade base 2 made of resin and a large number of inner blade plates 3 partially embedded in the inner blade base 2 and arranged in parallel in the longitudinal direction of the inner blade base 2 at intervals.
It is formed from and. The mandrel 1 is provided to prevent the entire inner blade body 4 from bending due to a force applied from outside during shaving.

The inner blade body 4 having such a structure is subjected to a molding process by insert molding to obtain a semi-finished inner blade body having substantially the same structure as the inner blade body, and each inner blade plate 3 has burrs at its peripheral portion. For the purpose of removing the above and correcting the height variation of each inner blade plate 3, the inner blade plate 3 of the semi-finished product is manufactured through a grinding process.

In the molding step, the mandrel 1 and a large number of inner blade plates 3 are inserted and set in a mold for molding the inner blade base 2 in advance before injecting the resin material for molding the inner blade base 2. After that, a step of injecting a melted resin material into the mold to mold the inner blade base 2 and at the same time fixing the mandrel 1 and the multiple inner blade plates 3 by embedding at least a part thereof Is.

Further, in the grinding step, a grinding machine equipped with a grinding wheel 5 (see FIG. 11) having a concave grinding groove 5a corresponding to a substantially semi-circular peripheral edge forming the blade portion of the inner blade plate 3 is installed. used. In this grinding step, a jig 6 (see FIGS. 10 and 11) having the inner blade semifinished product fixed thereto is set in a grinding device, and the inner blade semifinished product and the grinding wheel 5 driven to rotate are relatively moved. This is a step of moving and passing the inner cutter half-finished product through the grinding groove 5a to grind the peripheral edge of each inner cutter plate 3.

By the way, since both end surfaces of the mandrel 1 and the both end surfaces of the inner cutter base 2 are flush with each other to form a flat surface, both end surfaces in the longitudinal direction of the semifinished product of the inner cutter are fixed to the jig 6 Cannot be used as a mounting part for. Therefore, in order to fix the inner blade semi-finished product to the jig 6 in the grinding step, conventionally, as shown in FIG. 10, the adhesive 7 is applied to the upper surface of the jig 6, and the adhesive force of the adhesive 7 is applied. The inner blade semi-finished product is fixed and the grinding is performed.

[0007]

In the conventional manufacturing method,
When the inner blade plate 3 is ground, the inner blade body 4 is fixed to the jig 6 using the adhesive agent 7. Therefore, the inner blade body 4 is fixed depending on the variation in the coating thickness of the adhesive agent 7. There is a problem that it is inclined to the width direction or the longitudinal direction and is fixed to the jig 6, which easily causes grinding failure.

In addition, it takes a lot of time to apply the adhesive 7, and it takes a lot of time to peel off the inner blade body 4 adhered to the jig 6 after grinding, and after that, the jig 6 and the inner blade base 2 are removed.
Since it is necessary to remove the adhesive 7 attached to the
There is a problem that it takes a lot of time and labor for the whole grinding work and the manufacturing efficiency is low.

An object of the present invention is to provide a method for manufacturing an inner blade of a reciprocating electric shaver which can improve the grinding quality of the inner blade and can be easily manufactured.

[0010]

In order to achieve the above-mentioned object, a method for manufacturing an inner blade of a reciprocating electric shaver according to the present invention comprises an inner blade made of a molded product, and an inner blade made of the same. A semi-finished inner blade body including a projected pressed projection and a large number of inner blade plates that are partially embedded in the inner blade base and are arranged in parallel in the longitudinal direction of the inner blade base at intervals. , A molding process obtained by insert molding, and the inner blade base semi-finished product is mounted on a jig having an inner blade base mounting tool for holding the inner projection half-finished product by pressing the projection to be pressed. Fixing with a tool and grinding step of grinding the peripheral edge of the inner blade plate with a rotating grinding wheel, and cutting to separate the pressed protrusion from the ground inner blade semifinished product removed from the jig And a process.

[0011]

In the above structure, since the semifinished product of the inner blade formed by the molding process has the pressed projection,
In the grinding step, it is possible to fix the semi-finished inner blade body on the jig by using the pressed projection and pressing it with the inner blade attachment provided in the jig. Therefore, it is not necessary to use the adhesive for fixing the semi-finished product of the inner cutter to the jig in the grinding step, and various troubles associated with the adhesive can be eliminated. Then, the pressed protrusions, which are not required as a finished product, are separated from the semi-finished inner blade body in a cutting step performed after the grinding step, and the inner blade body is completed by this separation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 11 in FIGS. 8 and 9 denotes an inner blade body manufactured by the method of the present invention, which is one mandrel 12 made of metal, an inner blade base 13 made of synthetic resin, and a large number of metal pieces. And an inner blade plate 14.

An inner blade base 13 whose upper outer surface has a semi-circular shape when viewed from the end face direction is formed by embedding a mandrel 12, and the mandrel 12 is formed on both longitudinal end faces of the inner blade base 13.
Both ends of are exposed. The lower surface of the intermediate portion in the longitudinal direction of the inner blade base 13 [in FIG. 8 (A) and FIG. 9 (A)].
A pair of caulking projections 15 are integrally provided on the shaft.

The mandrel 12 provided to reinforce the inner blade base 13 is not always necessary, but in the present embodiment, in combination with the weight reduction, the metal hollow hollow pipe is used to reduce the vibration of the electric razor. Is used. When the mandrel 12 is used, a solid round bar or the like may be adopted.

A large number of inner blade plates 14 are formed by a pressing device or the like into a shape having a substantially semi-circular peripheral edge forming a blade portion. Part)
Is protruded from the inner blade base 13, and the remaining portion [the lower center portion in these drawings as shown in FIGS. 8 (B) and 9 (A)] is embedded in the inner blade base 13. There is. Moreover, the inner blade plates 14 are arranged side by side at predetermined intervals in the longitudinal direction of the inner blade base 13.

Reference numeral 24 in FIGS. 8 and 9 denotes a mounting base made of synthetic resin. The mounting base 24 has a pair of through holes 24a [see FIG. 9 (A)] through which the caulking projections 15 pass, and the caulking projections 1 are provided in the through holes 24a.
After inserting 5 into each, the tip portions of these protrusions 15 are caulked and crushed to obtain an inner blade body 11 that has been subjected to a grinding treatment.
Is attached to the lower surface of the central portion of the inner blade base 13.
The mount 24 is detachably attached to an inner blade drive shaft (not shown).

The inner blade body 11 having the above-mentioned structure is manufactured through a molding process, a grinding process, and a cutting process in this order.

The molding step is a step of obtaining the inner blade semifinished product 11a having the structure shown in FIGS. 1 and 2 by insert molding. The inner blade semi-finished product 11a is shown in FIGS.
Inner blade base 1 in the inner blade body 11 as a finished product shown in FIG.
The pressed protrusions 1 each having a flat plate shape are provided at both ends in the longitudinal direction of 3
3a is integrally formed to project. The configuration other than this point is the same as that of the inner blade 11.

In the molding die (not shown) used in this molding step, the pressed projection 13 is provided in the molding space.
A structure having a molding space corresponding to a is used. Then, in the molding step, the mandrel 12 and a large number of inner blade plates 14 are provided inside the molding die (molding space).
Is inserted and set before injection of the resin material for forming the inner blade base 13, and then the melted resin material is injected into the mold to form the inner blade base 13 and the pressed projection 13a, and at the same time, A so-called insert molding is performed in which at least a part of the mandrel 12 and the multiple inner blade plates 14 are embedded and fixed to the inner blade base 13.

The next grinding step to be carried out is shown in FIGS.
Grinding wheel 2 of a grinding machine in which the inner blade semi-finished product 11a obtained by the insert molding is fixed to a jig 16 shown in FIG. 6 and is rotationally driven by a motor provided in the grinding machine.
3 is a step of grinding the peripheral edge portion of each inner blade plate 14.

Before describing this step in detail, first, the structure of the jig 16 will be described. The jig 16 includes a jig main body 18 having a pair of positioning grooves 17 into which the caulking protrusions 15 are fitted, and a clamp portion 20a projecting from the main body 18 at an upper end portion thereof. The blade base attachments 20 are attached so as to be able to move up and down, and the attachments 20 are each biased downward by a coil spring 21.

The inner blade attachment 20 penetrates through the vertical guide through hole 18a of the jig body 18 and is pushed from below by a pusher (not shown) to rise against the spring force of the coil spring 21. The clamp part 2
0 is properly separated from the upper surface of the jig body 18. It should be noted that arrow A in FIG. 5 indicates the pressing direction of the busher, and 22 indicates the spring bearing attached to the lower end of the inner blade attachment 20.

As shown in FIGS. 3 and 4, the grinding wheel 23 has a concave grinding groove 23a corresponding to a substantially semi-circular peripheral edge forming the blade portion of the inner blade plate 14. The arrow B in FIG. 3 indicates the rotation direction of the grinding wheel 23.

In the grinding step, the semifinished product 11a of the inner cutting tool is fixed on the upper surface of the jig 16 and then brought into contact with the peripheral edge portion of the inner cutting board 14 and the grinding groove 23a of the grinding wheel 23. Product 1
It is carried out by removing 1a from the jig 16.

That is, the semi-finished product 11 of the inner blade for the jig 16
The fixing of a is performed by inserting the semi-finished product 11a of the inner blade body into the positioning groove 17 from one end of the jig 16 in a width direction of the jig 16 in a state where the pair of inner blade mount fixtures 20 are raised. By placing the pressed projection 13a directly under the clamp portion 20a of the inner blade base mounting portion 20 by sliding the lever 13a onto the inner blade base mounting portion 20 and then lowering the pair of inner blade base mounting tools 20 with the spring force of the coil spring 21. To do.

As a result, as shown in FIGS. 3 and 4, between the upper surface of the jig body 18 and the clamp portion 20a,
The pressed portion 13a is sandwiched from above and below, and the inner cutter base 13 of the inner cutter semi-finished product 11a is fixed to the jig 16. The spring force of the coil spring 21 bears the fixing force at that time.

In this way, the semifinished product 11a of the inner blade is fixed to the jig 16 without using an adhesive. Since the pressed projection 13a can be formed to have an arbitrary thickness and size so as to have a strength sufficient to withstand the attachment force (spring force of the coil spring 21) exerted by the inner blade mount fixture 20,
The inner blade semi-finished product 11a can be firmly fixed to the jig 16 with a large attachment force set by the coil spring 21.

Next, the inner blade semi-finished product 1 is manufactured as described above.
The jig 16 to which 1a is fixed is set in the grinding device, the inner blade semi-finished product 11a and the grinding wheel 23 are relatively moved, and the inner blade semi-finished product 11a is placed in the grinding groove 23a of the whetstone 23.
Pass through. As a result, the grinding wheel 23 grinds the peripheral edge portion of each inner blade plate 14 to remove burrs on the peripheral edge portion,
The height variation between the inner blade plates 14 is corrected.

Finally, the coil spring 21 is pushed by the pusher.
After the pair of inner blade mounts 20 is lifted against the spring force of No. 1, the ground inner semifinished product 11a is removed from the jig 16 along the positioning groove 17.

In the grinding process which is completed by the above series of operations, the semifinished product 11a of the inner blade can be fixed to the jig 16 without using an adhesive as described above. The tilt of the semi-finished inner blade product 11a on the jig 16 is eliminated.

Therefore, it is possible to prevent the defective grinding resulting from the above, and to improve the grinding quality of the inner blade plate 14. Moreover, since the adhesive is not used and the troublesome work such as application, peeling, and removal thereof is not required, the grinding work can be easily performed, thereby improving the manufacturability of the inner blade body 11. Can be improved.

The cutting step which is finally performed is the jig 1
In the step of separating the left and right pressed protrusions 13a from the inner blade base 13 as shown in FIG. 7 with respect to the ground inner semifinished product 11a that has been removed from 6, using a cutting cutter (not shown). is there. Through this cutting step, the inner blade body 11 having the configuration shown in FIGS. 8 and 9 is completed.

In the inner blade body 11 manufactured as described above, the portion which receives the fixing force of the clamp portion 20a in the grinding step is cut off in the cutting step.
Further, no trace of pressure for fixing the semi-finished product 11a of the inner blade remains on the inner blade 11, and a good appearance can be secured.

The present invention is not limited to the above-mentioned embodiment, and can be applied to the manufacture of an inner blade body having an inner blade base made of a die-cast molded product of an aluminum alloy, for example.

[0035]

As described in detail above, according to the method for manufacturing the inner blade of the reciprocating electric shaver according to the present invention, the adhesive is used to fix the semifinished product of the inner blade to the jig in the grinding step. This eliminates the need for grinding, and prevents defective grinding due to the semi-finished inner blade being tilted and fixed to the jig, so that the grinding quality of the inner blade can be improved. Since the trouble of applying, peeling and removing the agent is unnecessary, the workability is improved and the inner blade can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross section of a structure of an inner blade semi-finished product according to an embodiment of the invention.

FIG. 2 is a side view showing a configuration of an inner blade semifinished product according to the embodiment.

FIG. 3 is a cross-sectional view showing a state in which the semi-finished product of the inner blade according to the embodiment is fixed to a jig.

FIG. 4 is a side view showing a state in which the inner blade semifinished product according to the embodiment is fixed to a jig.

FIG. 5 is a cross-sectional view showing the structure of a jig used in the grinding process of the example.

FIG. 6 is a side view showing the configuration of a jig used in the grinding process of the embodiment.

FIG. 7 is a cross-sectional view showing a cutting process for the inner blade semi-finished product according to the embodiment.

FIG. 8A is a front view showing the inner blade body according to the embodiment to which a mounting base is attached. FIG. 3B is a side view showing the inner blade body according to the embodiment with a mounting base attached.

FIG. 9A is a cross-sectional view showing the inner blade body according to the embodiment with a mounting base attached. FIG. 9B is a sectional view taken along line ZZ in FIG.

FIG. 10 is a sectional view showing an inner blade body according to a conventional example and a jig for attaching and detaching the inner blade body separately.

FIG. 11 is a side view showing a state where the inner blade body according to the conventional example is fixed to a jig.

[Explanation of symbols]

11 ... Inner blade body, 11a ... Inner blade body semi-finished product, 13 ... Inner blade base, 13a ... Pressed protrusion, 14 ... Inner blade plate, 16
… Jig, 20… Inner blade mount fixture, 20a…
Clamp part, 21 ... Coil spring, 23
… A grinding wheel.

Claims (1)

[Claims] 1. An inner blade base made of a molded product, a pressed projection integrally projected from the inner blade base, and a part of the inner blade base embedded in the inner blade base so as to be spaced in the longitudinal direction of the inner blade base. A molding step of obtaining an inner blade semi-finished product having a large number of inner blade plates arranged side by side by insert molding, and an inner blade base for fixing the inner blade semi-finished product by pressing the pressed protrusion. A step of fixing the inner cutter half-finished product to a jig having a fixture by the inner cutter mount, and a grinding step of grinding the peripheral edge portion of the inner cutter plate with a rotating grinding wheel, and removing the jig from the jig. And a cutting step of separating the pressed protrusion from the ground and disassembled half-finished inner blade body product, the method of manufacturing an inner blade body for a reciprocating electric shaver.