JPS6126299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polishing device for a cylindrical commutator in a small DC motor, which is capable of smoothing the surface of the cylindrical commutator in a small DC motor to ensure roundness. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings of FIGS. 1 to 4 showing one embodiment.

A mounting part 5 having a V block part 4 rotatably supporting both ends of a rotating shaft 3 of a small DC motor to which a rotor 1 and a cylindrical commutator 2 are fixed is provided on a machine base 6.

In this embodiment, a pair of V-block supports 7 are fixed to a machine base 6, and V-blocks 9,
A pressing plate 10 is provided to securely fix the V-blocks 9, 9', and both ends of the rotating shaft 3 are rotatably supported between the V-blocks 9, 9'. There is. A rotor rotation adding device 12 equipped with an endless belt 11 that presses the upper surface of the rotor 1 to rotate the rotor 1 above the mounting portion 5
will be established.

In this embodiment, a driving roller 14, a driven roller 15, and an idle roller 16 that transmit rotation from a motor (not shown) are provided in the swinging arm 13 to suspend the endless belt 11, and one end of the swinging arm 13 is The main shaft roller 14 is pivotally mounted to be swingable about the axis thereof, and a rod portion of a clevis-type pneumatic cylinder 17 is pivotally mounted approximately at the center of the swing arm 13.
The base of this pneumatic cylinder 17 is pivotally connected to the machine base 6, and the pneumatic cylinder 17 is actuated to move the swinging arm 13 to a position where the lower transfer portion 18 of the endless belt 11 and the upper surface of the rotor 1 can come into pressure contact. The rotor 1 is rotated by the downward transfer section 18.

A bobbin 20 wound with an abrasive tape 19 on a machine base 6
A guide device 21 is provided for guiding the abrasive tape 19 pulled out from the bobbin 20 to the mounting portion 5 and bringing it into pressure contact with the lower surface of the cylindrical commutator 2.

In this embodiment, a support plate 22 protruding from the machine base 6 is provided on the side of the V-block 4, and a guide roller 23, a feed roller 24, and a guide plate 25 are attached to the support plate 22, and the bobbin 20 is pulled out. In addition, pressure rollers 26, 26' are provided on the support plate 22, and the pressure rollers 26, 26' are constantly pressed against one side of the polishing tape 19 by springs 27, 27'. The transfer of the polishing tape 19 is ensured by pressing.

A feeding device 28 equipped with a feeding roller 24 for moving this abrasive tape 19 at a low speed is provided, and an eccentricity that causes the abrasive tape 19 to reciprocate from side to side by the feeding roller 24 is provided on a machine body 29 on the upper part of the machine base 6 provided with this feeding device 28. A rocking device 31 with rollers 30 is provided.

In this embodiment, a machine body 29 is provided on the upper part of the machine base 6, a motor 32 capable of speed control is provided on this machine body 29, and an interlocking shaft 34 to which the feed roller 24 is fixed is inserted into one end of the main shaft 33 of the motor 32. Insert the motor 3 into the hole 35 and
The sliding key 36 fixed to the main shaft 33 of the motor 2 and the key groove 37 provided on the interlocking shaft 34 allow for free reciprocating movement and transmit the rotational force of the motor 32 to the interlocking shaft 34. A fitting tube 38 into which the support plate 22 is fixed at one end is fitted into a fitting hole 39 of the body 29, and a key provided on the tip of the positioning pin 40 provided on the body 29 and the outer periphery of the fitting tube 38 is inserted. With the groove-like groove 41, the motor 3
When the interlocking shaft 34 is rotated by 2, the fitting tube 3
8 are provided to prevent them from rotating together,
A sliding motor 42 is provided on the body 29 perpendicularly to the longitudinal direction of the interlocking shaft 34, and this sliding motor 42
The eccentric roller 30 is fitted and fixed to the rotating shaft 43 of the
The circumferential surface of the distal end of the eccentric roller 30 is fitted into the annular groove 44 provided on the outer circumferential surface of the fitting tube 38 at approximately the center, and the rotation of the sliding motor 42 causes the eccentric roller 30 to engage with the annular groove 44. The fitting cylinder 28 reciprocates due to the combination, and the reciprocating movement of the fitting cylinder 28 causes the support plate 22 to reciprocate, and the motor 32
The rotation causes the feed roller 24 to rotate, and since the feed roller 24 is provided on the support plate 22, it rotates and reciprocates, so that the abrasive tape 19 is transferred while reciprocating from side to side. It consists of Reference numeral 45 indicates a locking pin between the fitting cylinder 38 and the support plate 22, and a fixing pin 46 provided alongside this locking pin 45
The support plate 22 and the fitting tube 38 are fixed together.

Next, I will explain the operation based on the use of this machine.
The polishing tape 19 is pulled out from a bobbin 20 provided on the machine base 6 and wound with the polishing tape 19, and guided to the guide device 21 and the mounting section 5, and the polishing tape 19
to be suspended. In this state, both ends of the rotating shaft 3 are rotatably supported by the V-block portion 4 so as to be in pressure contact with the lower surface of the cylindrical commutator 2.

And a rotor rotation adding device 12 equipped with an endless belt 11 that presses the top surface of the rotor 1 from above.
is operated to press the lower transfer portion 18 against the upper surface of the rotor 1 and rotate the rotor 1.

In this state, the two surfaces of the cylindrical commutator have already been polished, but the motor 32 is further rotated to move the polishing tape 19 at a low speed, and the sliding motor 42 is rotated to remove the polishing tape. 19 The feed roller 24 for transfer is reciprocated to further polish the two surfaces of the cylindrical commutator, and after a predetermined polishing time has elapsed, the removal operation is performed.

By repeating this operation, a large amount of two surfaces of the cylindrical commutator can be polished.

After this polishing operation, the used tip portion of the polishing tape 19 has the abrasive material peeled off and becomes unusable, so it is appropriately disposed of.

In the conventional polishing device for the cylindrical commutator 2 of a small DC motor, the polishing tape 19 is not transferred and cannot reciprocate in the longitudinal direction of the cylindrical commutator 2, so that the polishing tape 19 is not required to be attached to the cylindrical commutator 2 surface. In some cases, it was inferior in terms of surface smoothness and roundness, which are the absolute requirements for

In order to solve this major drawback, the present invention guides the polishing tape 19 pulled out from the bobbin 20 to the mounting part 5, presses it against the lower surface of the cylindrical commutator 2, and uses a feed roller that moves the polishing tape 19 at a low speed. Since the feeding device 28 equipped with the abrasive tape 24 is provided, the circumferential surface of the cylindrical commutator 2 and the abrasive-coated surface of the abrasive tape 19 are always brought into pressure contact with a new surface, so that so-called clogging due to the abrasive can be completely prevented. , and since this feeding work is done automatically,
The two surfaces of the cylindrical commutator have excellent precision and roundness, and can be easily polished.

Furthermore, a sliding device 3 is provided with an eccentric roller 30 for reciprocating the polishing tape 19 from side to side on the body 29.
1, the two surfaces of the cylindrical commutator can be polished even more precisely.

As described above, according to the present invention, there is provided an excellent polishing device for a cylindrical commutator in a small direct current motor, which is lightweight and capable of reliably obtaining surface smoothness and roundness.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure shows the state of polishing of the cylindrical commutator, FIG. 3 is a front view of its essential parts, and FIG. 4 is a side sectional view thereof. DESCRIPTION OF SYMBOLS 1... Rotor, 2... Cylindrical commutator, 3... Rotating shaft, 4... V block part, 5... Mounting part, 6... Machine stand,
DESCRIPTION OF SYMBOLS 11... Endless belt, 12... Roller rotation addition device, 19... Polishing tape, 20... Bobbin, 21... Guide device, 24... Feed roller, 28... Feed device, 29... Machine body, 30... Eccentric roller, 31... Rocking device .

Claims (1)

[Claims] 1 V that rotatably supports both ends of the rotating shaft of a small DC motor with a fixed rotor and cylindrical commutator.
A mounting part with a block part is provided on the machine base, a rotor rotation adding device is provided above the mounting part with an endless belt that presses the top surface of the rotor in order to rotate the rotor, and an abrasive tape is wound on this machine base. A rotating bobbin is provided, a guide device is provided for guiding the abrasive tape pulled out from the bobbin to a mounting section and brought into pressure contact with the lower surface of a cylindrical commutator, and a feeding device is provided with a feeding rotor for moving the abrasive tape at a low speed. A polishing device for a cylindrical commutator in a small direct current motor, characterized in that a swinging device equipped with an eccentric rotor for reciprocating a polishing tape from side to side is provided on an upper body of the machine provided with the feeding device.