JP2000253616A - Dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain a connector easily with motor performance maintained, and increase productivity without increasing the cutting-down process of a frame, by forming a structure so that the part of the end surface of the motor frame may be cut down, the connector on a printed circuit board may be brought into contact with it, and a bracket may be retained. SOLUTION: A bracket 10 is stored in a fitting part of a frame 7, and several portions on the circumference of an opening in the frame 7 are caulked to form a motor assembly. In addition to forming the caulking portion for fixing a motor, a caulking portion 19 is formed, whose width is roughly equal to that of the connector 17, on the end surface of the frame. A printed circuit board assembly on which a connector 17 is fixed on a printed circuit board 16 is formed so that the position of the connector 17 may be brought into contact with the caulking portion 19 for retaining the connector, and the connector 17 is sandwiched by the printed circuit board 16 and the caulking portion 19 to be fixed positively. Even if all of the widths of several caulking portions are equal to that of the connector 17 so as to serve as the caulking portion for motor and the caulking portion 19 for retaining, it is possible to attain the same effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector holding structure for a DC motor used for driving a head of a printer, feeding paper, feeding paper of a PPC, a sorter, and the like.

[0002]

2. Description of the Related Art Conventionally, in a motor having a structure in which a connector is held near an opening end of a frame, the connector is sandwiched between a printed board and a frame end face edge or between a printed board and a resin bracket. If a resin bracket is used, its shape can be designed relatively freely, so that it is easy to hold the connector securely. However, compared to a metal bracket, the strength is weak and there is a problem in the electromagnetic shielding property. Therefore, it is desirable to adopt a structure in which the opening end of the metal frame is closed by the metal bracket. In that case, the motor has a structure in which a metal bracket is fitted into the open end of the frame.

On the other hand, the connector is arranged near the outer periphery of the frame so as not to protrude from the outer peripheral diameter of the frame due to a request for external connection. Therefore, the connector is arranged such that the front end of the connector is in contact with the edge of the opening end of the frame.

[0004]

However, in such a structure, the connector is held only at its front end, and a portion other than the front end has a considerable gap between the connector and the metal bracket. Therefore, when the mating connector is inserted into the connector, if the connector moves a little toward the inner peripheral side, the connector falls into the end face of the frame, causing an accident that the connector cannot be used. The present invention has been made to solve such a problem.

[0005]

SUMMARY OF THE INVENTION In a motor having a structure in which a connector is provided on a printed board and the connector is sandwiched between the end face of the motor frame and the printed board, a part of the end face of the frame is cut down to hold the connector. And

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, in a motor having a structure in which a connector is provided on a printed board and the connector is sandwiched between the motor frame end face and the printed board, a part of the frame end face is cut down. In this structure, the connector is held at that portion, and the connector can be easily held while maintaining the performance of the motor.

According to a second aspect of the present invention, the cut-down portion of the frame simultaneously performs the bracket holding function and the connector holding function, and the productivity is improved without increasing the frame cutting step. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

A first embodiment of the present invention will be described with reference to FIG.

An armature core 2 is caulked and fixed to the shaft 1, and a winding 4 is applied to the armature core 2 via an insulator 3. A commutator 5 has a coil wound around each riser and is electrically connected by solder or the like. Further, a varistor 6 for spark absorption is connected around the commutator 5. The amateur assembly is configured as described above.

A bracket 10 is provided with a leaf spring brush assembly 12 on which a metal 11 and vibration-proof rubber are adhered, and a bottom plate 13 to constitute a bracket assembly. Further, a metal 8 is press-fitted and fixed to the frame 7 and a magnet 9 is inserted and fixed by a magnet fixing spring (not shown) at the same time to constitute a frame assembly.

Next, a procedure for constructing a motor assembly using each component assembly constructed as described above will be described. First, the arm assembly is inserted while the brush assembly 12 of the bracket assembly is spread with a jig. Next, the frame assembly is put on the amateur assembly. In addition, bracket 1
0 is placed in the fitting portion of the frame 7, and several places on the circumference of the opening of the frame 7 are swaged to complete the motor assembly. At this time, a caulking portion 19 substantially equal to the width of the connector is provided separately from the caulking portion 18 for fixing the motor.

On the other hand, a printed circuit board assembly in which a connector 17 is fixed by soldering to a printed circuit board 16 which is substantially the same as the outer shape of the motor and is partially circumferential is completed by connecting and soldering the motor to the positive and negative sides. But connector 17
The connector 17 is securely fixed between the printed circuit board 16 and the caulking portion 19 if the position of the connector 17 is brought into contact with the caulking portion 19 for holding the connector. (FIG. 2) Further, all of the caulking parts in the above-mentioned several places are connected to the connector 1
The same effect can be obtained even if the width is set to 7 and the motor caulking portion and the connector holding caulking portion are also used. (FIG. 4)

[0014]

As apparent from the above description of the embodiment, according to the present invention, a connector is provided on a printed circuit board, and the connector is provided between the motor frame end face and the printed circuit board. The structure is such that a part of the end face is cut down to hold the connector, and the connector can be easily held while maintaining the performance of the motor.

[Brief description of the drawings]

FIG. 1 is a structural sectional view of a small DC motor according to an embodiment of the present invention.

FIG. 2 is a perspective view of the motor.

FIG. 3 is a partial sectional view of a cut-down portion of the motor.

FIG. 4 is a perspective view of a small DC motor according to another embodiment of the present invention.

FIG. 5 is a partial sectional view of a cut-down portion of a conventional motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft 2 Amateur core 3 Insulator 4 Winding 5 Commutator 6 Varistor 7 Motor frame 8, 11 Metal 9 Magnet 10 Bracket 12 Leaf spring brush assembly 13 Bottom plate 14 Terminal plate 16 Printed circuit board 17 Connector 18 Frame swaging part 19 Connector holding Cutting part

Claims (2)

[Claims] 1. A motor having a structure in which a connector is provided on a printed board and the connector is sandwiched between the motor frame end face and the printed board, and a part of the frame end face is cut down, and the connector is brought into contact with the cut-off portion. A DC motor characterized by being held. 2. The DC motor according to claim 1, wherein the cutting of the end face of the motor frame also serves as a means for caulking the frame and the bracket.