JPH0312042Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a capstan drive device in a magnetic recording/reproducing device. The aim is to provide a new configuration for supplying rotational force to a table, etc.

Conventional configurations and their problems The configuration shown in Figure 1 has been considered as a configuration in which a surface-facing motor directly drives a capstan, and this motor also drives other driven objects such as a reel stand. Ta. That is, in Figure 1,
Cylindrical magnetic case 1 with an opening at the bottom
An annular rotor magnet 5 is attached to the inside of the magnet case 16, and the magnet case 16 is fixed to a boss 15, into which the capstan shaft 1 is press-fitted. A stator coil unit 7 is arranged opposite the rotor magnet 5 and is held on a substrate 12 with screws 8. Further, a sub-plate 14 is attached to the boss 15 via the stator coil unit in order to reduce the magnetic circuit resistance of the magnet 5, and a pulley 11 is attached to the boss 15 via the screw 1.
It is attached by 8. The capstan shaft 1 includes a bearing 2 provided in a housing 3 that is attached to a base plate 12 with screws 4, and an angle 10 that is attached to the base plate 12 with screws 17.
It is rotatably held by a thrust receiver 9 attached to. The magnetic tape is pressed against the capstan shaft 1 by a pinch roller (not shown), and is transferred as the capstan shaft 1 rotates. Further, a belt is applied to the pulley 11 to supply rotational force to the reel stand.

In the above configuration, it is necessary to tighten the pulley 11 to the boss 15 with screws, and since the boss 15 is free to rotate in the direction of rotation during this screw tightening operation, it is very difficult and the configuration becomes complicated. was.

Purpose of the Invention The present invention aims to solve the above-mentioned problems by configuring a pulley so that it can be attached to a capstan motor so as to be able to rotate integrally with the capstan shaft without any special screw tightening work.

Structure of the Invention The present invention is configured so that the capstan shaft can be directly driven as a part of the rotor of a motor in which the rotor magnet and the stator face each other in a plane direction, and the rotor magnet which constitutes one part of the rotor. In order to reduce the magnetic circuit resistance of the rotor, a disk made of a magnetic material is fixed to the rotor on the opposite side of the stator by the attractive force of the rotor magnet and by providing unevenness on the contact surface between the disk and the rotor. At the same time, it has a configuration in which the rotational force of the motor is transmitted to the reel stand by a pulley provided integrally with the disc.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 2, inside the magnetic case 16,
An annular rotor magnet 5 is attached, and its magnet case 16 is fixed to a boss 15, and the capstan shaft 1 is press-fitted into the boss 15.

A stator coil unit 7 is arranged opposite the rotor magnet 5, and this stator coil unit 7 is fixed to a substrate 12 with screws 8. The sub-plate 14 is made of a disk-shaped magnetic material, and the pulley 11 is attached by ultrasonic welding or the like. Further, the sub-plate 14 is fixed to the boss 15 by the attraction force of the rotor magnet 5 so as to be located on the opposite side of the stator coil unit 7. The capstan shaft 1 includes a bearing 2 provided in a housing 3 that is attached to a base plate 12 with screws 4, and a bearing 2 provided in a housing 3 that is attached to a base plate 12 with screws 17.
It is rotatably held by a thrust receiver 9 attached to an angle 10 attached to the holder. In addition, the magnetic tape is attached to the above capstan shaft 1.
is pressed by a pinch roller and transferred as it rotates. Further, a belt is applied to the pulley 11 to supply driving force to the reel stand.

Although not shown, the contact surfaces of the boss 15 and the sub-plate 14 engage with each other through a concave and convex portion in the direction of the capstan shaft 1, and the pulley 11 and the boss 15 are configured to rotate integrally. This increases the contact area between the abutting surfaces of the boss 15 and the sub-plate 14, so that the sub-plate 14 is more securely fixed to the boss 15 by the suction force of the rotor magnet 5.

Effects of the Invention As described above, the present invention utilizes a sub-plate disposed on the opposite side of the stator coil unit in order to reduce the magnetic circuit resistance of the rotor magnet. Since the pulley is attached to the rotating part (boss 15) of the motor using the magnetic attraction between the rotor magnets, there is no need to fix the pulley to the rotating part with screws. Construction and assembly operations are simplified.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional capstan driving device, and FIG. 2 is a side sectional view of a capstan driving device according to an embodiment of the present invention. 1...Capstan shaft, 3...Housing, 5
...Rotor magnet, 7...Stator coil unit, 11...Pulley, 14...Sub plate.

Claims (1)

[Scope of utility model registration request] The rotor magnet has a rotor magnet and a stator facing each other in a plane direction, and has a pulley integrally formed on the opposite side of the stator, and has magnetism for reducing magnetic circuit resistance of the rotor magnet, which rotates in synchronization with the rotor. A capstan drive device in which a capstan shaft and a rotor are directly driven as a part of the capstan shaft and the rotor, the capstan drive device having a capstan shaft and a rotor having uneven portions on the abutting surfaces of the magnetic disc and the rotor, respectively, to attract the rotor magnet. A capstan drive device in which the magnetic disk and the rotor are fixed by force and engagement of the uneven portions.