JPS61280729A - Processing of commutator of miniature motor - Google Patents

Abstract

PURPOSE:To remove flashes by forming side corner parts of a commutator segment into the shapes corresponding to the recessed parts of a roller jig. CONSTITUTION:When an insertion pin 13 descends, a commutator 1 is pressed by the insertion pin 13 and descends to the direction (b) shown in the figure, while the tip part of a positioning member 12a is sliding in a groove 3. When the commutator 1 reaches the predetermined position, the recessed parts 5' of a roller jig 5 are ready to press flashes 4 and the flash removing process is carried out. The recessed parts 5' of the jig 5 keep on pressing the flashes while the commutator 1 is descending to the direction (b) shown in the figure. Therefore, the roller jig 5 rotates in accordance with the descend of the commutator 1 and the recessed parts 5' of the jig 5 are continuously pressed against the flashes 4 so that the flashes can be continuously removed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for processing a commutator in a small motor, and in particular, to a cylindrical commutator member formed of a conductive metal, and a method for manufacturing a commutator member molded inside the commutator member. In a method for processing a commutator in a small motor, the molded commutator integrally formed with an insulating member made of synthetic resin is perforated in the longitudinal direction to form a plurality of commutator segments. The present invention relates to a processing method for efficiently removing burrs generated by the above-mentioned drilling process.

(Prior Art and Problems to be Solved by the Present Invention) Conventionally, as a processing method for manufacturing a commutator in a small motor, a cylindrical commutator member made of a conductive metal (e.g. copper), A processing method includes molding a synthetic resin inside the commutator member to form an insulating cylinder integrally with the commutator member, and then drilling grooves at multiple locations on the commutator member to form a plurality of commutator segments. Are known.

The so-called mold commutator manufactured by this processing method has a high roundness because the sliding surface that comes into contact with the brush can be processed by rotary cutting using a lathe or the like (hereinafter referred to as outer diameter cutting). It has the excellent feature that it is possible to obtain a moving surface having

However, in the above-mentioned mold commutator, as described above, the cylindrical commutator member is perforated in the longitudinal direction at a plurality of locations to form a plurality of commutator segments. As shown in FIG. 1(A), burrs 4 are generated at the side corners of the commutator segment 1'. The burrs must be removed because the burrs make the contact with the brush unstable and cause undesired sparks and electrical noise. In addition, the above-mentioned burr generation state is determined by performing the above-mentioned drilling process using the so-called upper cut method.

This differs depending on whether the amplifier cut method is used, or whether it is performed before or after cutting the outside diameter as described above, but as shown in Fig. 1 (A), it occurs by protruding outside the groove 3. With the condition B (a).

Although not shown, there is a condition B (b) that occurs inside the groove 3. As a conventional burr removal method, the following method has been used in response to the above conditions (a) and (b).

(i) A method in which a wedge-shaped blade is pushed into a groove and moved. That is, it is a method of scraping off the burr with a wedge-shaped cutter, so to speak, and is applied to the above-mentioned condition B (b).

(ii) A method applied to the above condition (a), in which burrs are removed using wrapping film, sand paper, or the like.

However, the above burr removal methods (i) and (ii) have the following first-order problem. That is, in the above method (i), it is difficult to automate and requires manual labor, resulting in poor productivity. Furthermore, when the above method (ii) is applied to the above condition (a) which occurs when the above-mentioned groove processing is performed after the above-mentioned outer diameter cutting and the groove processing is performed by the so-called upper cut method, In some cases, the brush and commutator segment may be damaged due to the removal of the so-called kerf marks formed on the surface of the commutator segment by the external cutting described above.
There is a problem in that the effective contact area with the segment is reduced.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and therefore, a method for machining a commutator in a small motor according to the present invention is to with commutator parts.

A molded commutator integrally formed with an insulating member made of synthetic resin molded inside the commutator member is perforated in the longitudinal direction to form a plurality of commutator segments. In a method for machining a mutator in a small motor, a disc-shaped roller jig is used, in which a concave portion having a predetermined radius of curvature is formed on the outer circumference and is configured to be freely rotatable. The above recessed part is inserted into the above commutator.
The side corners of the commutator segments are pressed against the burrs generated by the drilling process with a predetermined pressure and moved relative to the mold commutator. Processed so that it has a shape that corresponds to the concave part of the roller jig,
The present invention is characterized in that the burrs are substantially removed.

This will be explained below with reference to four drawings.

(Embodiments of the invention) FIGS. 1(A) and (B) are explanatory views for explaining the basic principle of the processing method of the present invention, and FIG. 2 is a processing example of the present invention. A) is a side sectional view, Figure 2 (B)
) shows a sectional view taken along arrow A-A in FIG. 2(A).

First, the basic principle of the processing method of the present invention will be explained with reference to FIGS. 1(A) and 1(B). Note that the code 1 in Figure 1 is the commutator, and 1' is the commutator segment.
2 is an insulating tube formed by molding synthetic resin, 3 is a groove formed by the drilling process described at the beginning of this specification, 4 is a burr, and 5 is a roller jig. 5' is a jig recess having a predetermined radius of curvature R, and 6 is a corner of the commutator.

In the processing method of the present invention, as shown in FIG. 1(A), by moving the roller jig 5 in the direction of the arrow shown in the figure, the jig recesses 5', 5' are aligned with the burrs 4°4 at a predetermined position. By applying pressure, the burrs 4.4 are removed by crushing them. Note that the burrs 4, 4 are generated entirely along the groove 3. Accordingly, in the present invention, the roller jig 5 is rotatably supported, as will be described later with reference to FIG.

With the jig recesses 5', 5' pressed against the burrs 4, 4, by moving the commutator in the direction of drilling the groove 3 (perpendicular to the plane of the drawing), the groove 3 is removed. The burrs 4.4 generated along the surface are completely removed.

FIG. 1(B) is a diagram showing a state in which burrs have been removed based on the processing method of the present invention. That is.

As a result of the burr removal, the commutator corners 6, 6 along the groove 3 are formed into a rounded shape corresponding to the radius of curvature R of the jig recesses 5', 5'. Note that the burr 4 shown in FIG. 1(A) corresponds to the burr occurrence condition B (a) explained in the 9th part of the present specification phonograph head, but the burr occurrence state (2) explained in the 2nd application specification phonograph head part ( It goes without saying that the processing method of the present invention is also applicable to case (b) (not shown).

Next, an embodiment of burr removal based on the processing method of the present invention will be described with reference to FIGS. 2(A) and 2(B). Reference numerals 1, 2, 3 in the figure. and 5 correspond to Fig. 1,
7 is a burr removing device; 8 is a main body of the device; 9 is a roller shaft that pivotally supports the roller jig 5; 10 is a roller support section that rotatably supports the roller shaft 9 and supports the roller jig 5; 11 is a spring that presses the roller support portion, and 12a and 12b are positioning members. Note that the positioning members 12a and 12b are fixed to the device main body 8, and the positioning members 12a and 12b are fixed to the device main body 8.
The distal end portions (unshaded portions shown) of and 12b are located on the same line as the distal end portion of the roller jig 5, and are formed to be slidable within the upper groove 3. Further, 13 represents an insertion pin which is driven by a driving device such as an air cylinder. Although not shown, it goes without saying that the roller jig 5 is formed with a jig recess 5' shown in FIG. 1(A).

In FIGS. 2(A) and 2(B), first, the burr removing device 7 is positioned so that the tip of the positioning member 12a is located in the groove 3, and then the insertion pin 13 is moved by a drive device (not shown). Lower it in the direction of arrow a in the figure. As the insertion pin 13 descends, the commutator 1 is pressed by the insertion pin 13, and the tip of the positioning member 12a slides within the groove 3 while descending in the direction indicated by the arrow. Then, when the commutator 1 reaches a predetermined position,
As explained with reference to FIG. 1(A), the jig recesses 5', 5' formed on the outer periphery of the roller jig 5 are filled with burrs 4,
4 is brought into pressure contact, and the burr removal described with reference to FIG. 1 is performed. Note that the jig recesses 5', 5'
The pressing force against the burr 4.4 due to the roller jig 5 is
This is caused by the elastic force of the spring 1 that presses the roller support part 10 that rotatably supports the roller shaft 9 that supports the roller shaft 9.

The commutator 1 continues to descend in the direction indicated by the arrow while the jig recesses 5', 5' continue to press the burr 4.4. Therefore, as the commutator 1 descends, the roller jig 5 rotates, and the jig recesses 5', 5' always come into pressure contact with the bulges 4.4, so that the burr removal described above is performed continuously.

An embodiment of burr removal performed based on the basic principle of the processing method of the present invention explained with reference to FIG. 1 has been described above, and in FIG. However, instead of the spring 11, another elastic body (such as rubber) may be used, or a driving means such as an air cylinder may be used to press the roller support portion 1o. It may be pressed with a predetermined pressure.

(Effects of the Invention) As explained above, according to the present invention, burrs generated on the commutator segments due to the drilling process performed on the mold commutator to form a plurality of commutator segments can be removed. Not only can the process be carried out efficiently, but the burr removal process does not require consumables such as sand paper, unlike conventional methods, so the burr removal process can be carried out at a low cost. Furthermore, since the effective contact area during contact with the brush is increased, burrs can be removed without damaging the important "grips" on the surface of the commutator segment. Furthermore, the burr removal process does not impair the roundness of the outer circumferential surface of the commutator segment.

[Brief Description of the Drawings] Figures 1 (A) and (B) are explanatory diagrams for explaining the basic principle of the processing method of the present invention, and Figure 2 is a processing example of the present invention. (A) is a side sectional view, Figure 2 (B)
) shows a sectional view taken along arrow A-A in FIG. 2(A). In the figure, 1 is a commutator, 1' is a commutator segment, 2 is an insulating tube, 3 is a groove, 4 is a burr, 5 is a roller jig, 5' is a jig recess, 6 is a commutator corner, and 7 is a burr removal 8 is a device main body, 9 is a roller shaft, 10 is a roller support part, 11 is a spring, 12a and 12b
is a positioning member. 13 represents an insertion bin. Patent applicant Mabuchi Motor Co., Ltd. Representative Patent Attorney
Mori 1) Hiroshi (and 2 others) Proceeding Officer's official seal) September 6, 1985 (1 Michibe Uga, Commissioner of the Patent Office 2, Name of the invention: Processing method for commutator in small motor 3, amendments) Patent applicant address: 430 Matsuhidai, Matsudo City, Chiba Prefecture Name: Mabuna Motor Co., Ltd. Representative: Takashi Umabuchi - 4, Agent address: 4-17-1-5, Nishi-Nippori, Arakawa-ku, Tokyo Increased due to amendment Number of inventions to be made: None 6, Subject of amendment: Detailed description of the invention column 9 Contents of simple amendments to drawings) In the 4th line of page 7 of the specification, it is written that ``A sectional view is shown.''
This is corrected as follows. "Cross-sectional views, FIGS. 3(A) and 3(B) show illustrations of other processing embodiments of the present invention.") On page 11, line 14 of the specification, it is stated that "pressing with pressure ” is corrected as follows: "You may press it with pressure. FIG. 3 is an explanatory diagram for explaining another processing embodiment of the present invention, and the symbols in FIG. 2 correspond to those in FIG. 1. The illustrated embodiment is basically the same as the processing method described in connection with FIGS. 1 and 2, but the jig recess 5' of the roller jig 5 used in the illustrated embodiment of FIG.
As shown in FIG. 3(A), the grooves are formed with right-angled steps. Therefore, by performing the deburring process using the roller jig 5 shown in FIG. 3(A), the commutator corner portion is removed from the jig concave portion 5 as shown in FIG. 3(B). ′. As is clear from FIG. 3, in the embodiment shown in FIG. 3, since the roller jig 5 contacts only the portion where the burr 4 protrudes, it is possible to reduce the pressing force of the roller jig 5. In addition, this is an efficient processing method that requires only a small amount of deformation of the commutator segment 1' to remove the burr 4. ”. (3) A sectional view along rA-A is shown on page 12, line 17 of the specification. ” is corrected as follows. The sectional view along rA-A and FIGS. 3(A) and 3(B) show illustrations of other processing embodiments of the present invention. ”. (4) Attachment Figures 3 (A) and (B) will be added to the drawings. that's all.

Claims (1)

[Claims] A molded body in which a cylindrical commutator member made of conductive metal and an insulating member made of synthetic resin molded inside the commutator member are integrally formed.
In a method of machining a commutator in a small motor, the commutator is machined longitudinally to form a plurality of commutator segments.
Using a disk-shaped roller jig, which has a recessed portion having a predetermined radius of curvature formed on its outer periphery and is configured to be freely rotatable, the recessed portion formed on the outer periphery of the roller jig is inserted into the commutator segment. By pressing the side corners of the commutator segment against the burrs generated by the drilling process with a predetermined pressure and moving them relative to the mold commutator, the side corners of the commutator segments A method of machining a commutator in a small motor, characterized in that the commutator is machined into a shape that corresponds to the concave portion of a roller jig, and the burrs are substantially removed.