JPH0453183Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a flat motor that is often used in office automation equipment such as copying machines.

[Conventional technology]

A DC servo motor is known as this type of flat motor, and Figure 2 shows a conventional DC servo motor.
A cross-sectional view of the servo motor is shown.

In the figure, 1 is a rotating shaft, 2 is an armature fitted and fixed to this rotating shaft 1, and a motor coil 3
In addition to having a built-in motor coil 3, it also has a commutator 4 electrically connected to the motor coil 3. One end of the rotating shaft 1 is supported by a bearing 6 mounted in a bearing holder 5a of a front bracket 5 made of a magnetic material. The rear bracket 7 is made of a magnetic material, and a cover 9 made of a magnetic material is attached by a fastening member (screw) 8. The other end of the rotating shaft 1 is supported by a bearing 10 mounted in a bearing holder 9a of the cover 9. An annular motor permanent magnet 11 is fixed to the armature 2 side of the rear bracket 7. The armature 2 rotates integrally with the rotating shaft in the space between the motor permanent magnet 11 and the front bracket 5. Reference numeral 12 denotes a power supply brush which is in pressure contact with the commutator 4. A brush holder 13 holds the brush 12, and the brush holder 13 is attached to a base 14 made of an insulating material. This base 14 is fixed to the rear bracket 7 with screws 15. 16 is a spring for pressing the brush 12 against the commutator 4. 17 is a speed detector for detecting the number of rotations. Rotor 171 and this rotor 171
Boss 172 for fixing and this boss 172
A rotor portion 170 of the speed detector 17 is formed by a set screw 173 for fixing the rotor to the rotating shaft 1. Furthermore, a stator 179 of the speed detector 17 is connected to a stator 174 provided on the outer periphery facing the rotor 171, a coil 176 and a permanent magnet 177 wound around a bobbin 175, and a lead wire 178 connected to the coil 176. is formed.

The stator 174 is press-fitted into the cover 9. Also, the same number of teeth are provided on the inner and outer diameter portions of the rotor 171 and the stator 174 that face each other.

Reference numeral 18 is a motor lead wire connected to the brush 12 for applying a DC voltage.
Further, the lead wire 178 for the speed detector is used to take out the pulse voltage generated by the rotation to the outside and use it for speed control.

19a is a lead wire 178 drilled in the cover 9
The exit hole 19b is also an exit hole for the lead wire 18 made in the cover 9, and each lead wire 1
Insulating bushings 20a and 20b are inserted into the lead wire outlet hole 19 for ground fault protection of 78 and 18.
a, 19b.

Next, the operation will be explained. When a DC voltage is applied to the brush 12 from a power supply unit (not shown) via the lead wire 18, a current flows through the motor coil 3, and this current and the magnetic flux of the motor permanent magnet 11 generate a rotational force in the armature 2, and the above-mentioned rotational force is generated in the armature 2. The armature 2 rotates together with the rotating shaft 1. At this time, since the rotor 171 of the speed detector also rotates at the same time, the magnetic flux of the permanent magnet 177 changes due to the teeth provided on the stator 174 and rotor 171, and a pulsed voltage with a frequency proportional to the rotation speed is generated. occurs in coil 176. This voltage (frequency)
is used to detect the speed of the flat motor.
A flat motor configured in this manner is mainly used for driving an optical system of a copying machine or the like.

[Problem that the invention attempts to solve]

The conventional flat motor is constructed as described above, but the base 14 on which the brush holder 13 is mounted is directly attached to the rear bracket 7 with screws 15, and the base 14 is directly attached to the rear bracket 7 with screws 15. In a closed container. On the other hand, a DC rotating machine has a biased magnetic effect, and unless the position of the brush 12 is adjusted to the optimum position on the commutator 4, sparks will occur between the contact portion of the brush 12 and the commutator 4. The brush 12 is housed in a brush holder 13, and since this brush holder 13 is attached to a base 14, adjustment is performed by moving the base 14 in the circumferential direction. Further, this adjustment work must be performed with the flat motor completely assembled, but as described above, the base 14 has a fully closed structure, and adjustment cannot be performed in this state. Therefore, an open jig with the same function as the cover 9 is used to adjust the position of the brush 12, and after fixing the base 14 with the screws 15, the jig is removed and the cover 9 of the product is attached. This work was necessary.

This invention was made to solve the above problems.

[Means to solve problems]

In the flat motor according to this invention, a base made of an insulator and supporting a commutator brush is interposed between the first and second brackets by a tightening member so that at least the outer circumferential side surface is exposed. .

[Effect]

In this invention, since the base is interposed between the first and second brackets by the tightening member so that at least the outer circumferential side surface is exposed, the tightening member can be tightened without using an open jig. The base can be rotated by loosening the biasing force, and the base can be moved in the circumferential direction from the outside of the flat motor to easily adjust the brush position to an appropriate position.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of this invention. In the figure, numerals 1 to 13 and 16 to 18 are the same as the conventional device described above.

21 is a base made of an insulating material, and 21a is an outlet hole for the lead wires 178, 18, which is provided in the base. 8 is a tightening member, and the described example shows a case where a screw is used. In addition, in the figure, the first bracket is shown when the front bracket 5 and rear bracket 7 are combined.
The cover 9 will also be referred to as a second bracket.

In the flat motor configured as described above, the base 21 is equipped with the brush holder 13.
As a method of attaching the cover (second bracket) to the first bracket 70, the cover (second bracket) 9 is interposed between the cover (second bracket) 9 and the first bracket 70, and the screw 8 is tightened from the outside of the cover (second bracket) 9. I'm trying to fix it. Therefore, by loosening the screw 8, the base 21 becomes movable in the circumferential direction, and the base 21 can be easily moved (adjusted) from the outer surface of the flat motor by, for example, placing a finger on the lead outlet hole 21a. . Also, if the hole in the base 21 through which the screw 18 passes is made larger than the diameter of the screw 18, the adjustment margin will increase accordingly.
The shape of the hole to be drilled in 1 may be changed depending on the need, such as a round hole, an elliptical hole, or a sea cucumber hole.

Note that adjustment of the base 21 will be easier if the outer diameter of the base 21 is made larger than or the same diameter as the outer diameter of the cover 9, but if the threaded portion on the outer periphery of the base 21 is made into a notched gear shape. This makes adjustment even easier.

Further, since the lead outlet hole 21a is provided in the base 21 made of an insulating material, the lead wires 18, 178 do not come into direct contact with the cover 9 or rear bracket 7 made of a magnetic material (iron plate, etc.). Therefore, short circuit protection is not required. Furthermore, if the base 21 is molded from synthetic resin, the lead outlet hole 21a can also be molded at the same time, further improving productivity.

[Effect of idea]

As described above, according to this invention, the base, which supports the commutator brush and is made of an insulator, is interposed between the first and second brackets by the tightening member so that at least the outer peripheral side surface is exposed. Therefore, the position of the base can be easily adjusted from the outside of the flat motor. A brush holder with a brush inside is attached to the base, making it extremely easy to adjust the brush position.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a sectional view of a conventional flat motor. In the figure, 1 is the rotation axis, 2 is the amateur, and 3
4 is a motor coil, 4 is a commutator, 5 is a front bracket, 6 is a bearing, 7 is a rear bracket, 70 is a first bracket, which is a combination of front bracket 5 and rear bracket 7, 8 is a tightening member, 9 is the cover (second bracket), 1
0 is a bearing, 11 is a permanent magnet for the motor, 12 is a brush, 13 is a brush holder, 16 is a spring, 17 is a speed detector, 170 is a rotor part of the speed detector, 1
71 is a rotor, 174 is a stator, 176 is a coil, 177 is a permanent magnet, 178 is a speed detector lead wire, 179 is a stator part of the speed detector, 18 is a motor lead wire, 21 is a base, 21a is a lead outlet It is a hole. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A rotating shaft 1 supported by bearings 6 and 10 near both ends, an armature 2 extending radially from the rotating shaft 1, and a fixed distance between the armature 2 and the rotating shaft 1. A first bracket 70, which includes opposing permanent magnets 11 for the motor, extends from one end of the rotating shaft 1, a second bracket 9 extends radially from the other end of the rotating shaft 1, and a commutator brush 12. first and second brackets 70 for supporting and exposing at least the outer peripheral side surface;
a base 21 made of an insulator interposed between
Base 2 between the first and second brackets 70 and 9
1, the base 21 can be rotated by loosening the clamping force of the clamping member 8, and the position of the commutator brush 12 can be adjusted by rotating the base 21 from the outside. Tutmotor. (2) The flat motor according to claim 1, wherein the base 21 is molded from an insulating synthetic resin. (3) The base 21 has a round hole, an oval hole, or a sea cucumber hole into which the tightening member 8 for tightening the base 21 is inserted between the first bracket 70 and the second bracket 9. A flat motor according to claim 1 of the patented utility model. (4) Practical use characterized in that the base 21 has a notch on the outer periphery of the portion where the tightening member 8 for tightening the base 21 is inserted between the first bracket 70 and the second bracket 9. A flat motor according to claim 1 of patent registration. (5) The outer diameter of the base 21 is the same as the outer diameter of the cover 9.
The flat motor according to claim 1 of the utility model registration, characterized in that the flat motor is larger than that.