JPS6123407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermittent drive device that is used when intermittent drive is required, such as a paper feed device for printers, typewriters, copiers, etc. or a film feed device for a projector. without causing
Another object of the present invention is to provide a device that can perform smooth intermittent drive semi-permanently without requiring a special control device or causing failures.

The present invention will be described in detail with reference to the embodiments shown below. In the drawings, 1 is a fixed support base, 2 is a coupling magnet body fixed to a fixed shaft 3 fixedly supported by the fixed support base 1, and may be an electromagnet, The example shows the case of a permanent magnet, in particular, as shown in FIG. 2, it is long in the radial direction, one end of which is a north pole, and the other end is a south pole. 4 is a bearing 5 at the opening of the cylindrical part.
The cylindrical part of the cylindrical part of the drive-side connecting member is supported on the fixed shaft 3 via the cylindrical part, and is composed of magnetic and non-magnetic materials alternately arranged in the circumferential direction. The non-magnetic materials occupy symmetrical positions with respect to the center, and the inner circumferential surface of the cylindrical portion made up of these materials faces the magnetic pole portion of the magnet body 2 with a small gap in between. 6 is the drive side connecting member 4
A driving gear 7 fitted on the outer periphery of the open end of the brake magnet 7 is connected to the driving side connecting member 4 and has one end supported by a bearing 8. It has the same shape as the magnet 2, but has a magnetic pole. The position is shifted by 90 degrees in the circumferential direction with respect to the magnetic pole of the magnet body. Reference numeral 9 denotes a stop-shaped braking member fixed to the support base 1 at a portion of the fixed shaft 10 that continues to the bottom, and the inner circumferential surface of the cylindrical part is opposed to the magnetic pole part of the braking magnet 7 with an air gap in between. The cylindrical portion of the braking member is composed of magnetic and non-magnetic materials alternately arranged in the circumferential direction, similar to the drive-side connecting member 4. Reference numeral 11 denotes a cylindrical driven-side connecting member whose one end is supported on the fixed shaft 10 via a bearing 12, and its inner peripheral surface extends over the outer peripheral surfaces of both the cylindrical parts of the driving-side connecting member 4 and the brake member 9. They face the outer circumferential surfaces of the two with a gap in between. 13 is magnetic powder filled in the gap between the outer peripheral surface of each cylindrical part of the driving side connecting member 4 and the braking member 9 and the inner peripheral surface of the driven side connecting member 11; 14, 15, 16 are magnetic powders; A sealing material 17 for preventing leakage of the powder 13 from the sealed cavity is an output-side gear fitted to the outer periphery of the driven-side connecting member 11.

The embodiment of the present invention is constructed as described above, and when the drive-side connecting member 4 is rotated by the drive source through the gear 6, the magnetic material and the non-magnetic material forming the cylindrical portion of the connecting member alternate. When the magnetic body faces the magnetic pole, a magnetic flux is generated that flows through the magnetic body part, the magnetic powder 13, and the driven side connecting member 11, and the magnetic powder Connecting members 4, 11 between the particles of the body 13 and on the driving side and the driven side
A magnetic attraction force acts between them, and the driving-side connecting member and the driven-side connecting member are dynamically coupled through the magnetic powder, and the rotation of the driving-side connecting member is transmitted to the driven-side connecting member. The rotation is further transmitted to the non-rotating driven load via a gear 17 fixed to its driven coupling. Furthermore, when the non-magnetic material of the cylindrical portion of the drive-side connecting member 4 is in a position facing the magnetic pole portion of the magnet body 2, the magnetic resistance of that portion is large due to the non-magnetic material, and the magnetic flux passing through the magnetic powder 13 portion disappears. Therefore, the magnetic attraction force acting on the magnetic powder disappears, and the transmission of power to the driven side connecting member 11 and, therefore, the load related thereto is cut off. This kind of operation causes the drive side connecting member 4 to
The rotation of the cylindrical portion causes the magnetic and non-magnetic materials that make up the cylindrical portion to alternately face the magnetic poles of the coupling magnet, and the rotation of the driving-side coupling member intermittently causes the driven-side coupling member to rotate. communicated. Further, in parallel with the above action, the braking magnet body 7 is rotated by the rotation of the drive side connecting member 4, so that the magnetic pole part of this magnet body is a part of the magnetic material and non-magnetic material that constitutes the cylindrical part of the braking member 9. When facing the magnetic body, a magnetic flux flows through the magnetic body to the magnetic powder 13 and the driven side coupling member 11, and the braking member 9, the magnetic powder 13, and the magnetic flux flow through the magnetic body. The three members of the driven-side coupling member 11 are brought into a coupled state by the action of magnetic attraction, and at the time when this coupling action is activated, the coupling magnet 2 and the braking magnet 7 are offset by 90 degrees with respect to the rotation direction. Since the connecting magnet 2 faces the non-magnetic portion of the driving side connecting member 4, the transmission of power from the driving side connecting member 4 to the driven side connecting member 11 is interrupted. be. Furthermore, when the magnetic pole of the braking magnet 7 faces the non-magnetic part of the braking member 9, this part blocks the flow of magnetic flux to the magnetic powder part, so that the braking member and the driven-side connecting member 11 are connected to each other. The dynamic binding force is released. Therefore, while power is being transmitted to the driven side connecting member 11, braking is released, and when power transmission to the driven side connecting member 11 is interrupted, braking is applied to it, resulting in intermittent drive of the load. will be carried out smoothly at appropriate intervals. In addition, in the example, the case where a permanent magnet is used as the connecting magnet body is illustrated, but when this is used as an electromagnet, intermittent operation is performed on the load by supplying power to the coil of the electromagnet, and the intermittent operation is performed by cutting off the power supply. Intermittent operation of the load can be stopped,
In addition, in the embodiment, the position of the magnetic poles of the connecting magnet body 2 and the braking magnet body 7 is shifted by 90 degrees with respect to the rotation direction. Even if the arrangement of the magnetic material and non-magnetic material constituting the part is magnetically shifted by 90 degrees with respect to the arrangement of the magnetic material and non-magnetic material constituting the cylindrical part of the drive-side connecting member 4, the effect will still be the same in the above case. is essentially the same as Furthermore, various braking characteristics can be obtained by changing the ratio of the length in the circumferential direction and the arrangement angle of the magnetic material and the non-magnetic material that constitute the cylindrical portions of the drive-side connecting member and the braking member. Furthermore, by selecting the number of magnetic poles of the magnet body, intermittent operation with various periods can be performed.

According to the present invention, the drive-side connecting member is composed of a magnetic material and a non-magnetic material, and these parts alternately pass through the magnetic pole part of the magnet, thereby intermittently magnetizing the magnetic powder. The power is transmitted intermittently by the magnetic coupling force caused by this magnetization, and at the same time, the braking unit that utilizes the same principle is operated in conjunction, so smooth and accurate intermittent drive can be performed. Moreover, it is possible to provide a quiet device with no noise-generating parts.Furthermore, since there are no mechanically worn parts except for the magnetic powder, semi-permanent use is possible by simply replacing the magnetic powder, and it is not complicated. It is even more convenient because it does not require a control circuit or the like, and because it uses a permanent magnet as the magnet, it does not require a power source.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B' in FIG. FIG. 2... Connecting magnet, 4... Drive side connecting member,
7... Braking magnet, 9... Braking member, 11...
Driven side connecting member, 13...magnetic powder.

Claims (1)

[Claims] 1. The cylindrical part of the drive-side connecting member that rotates around the connecting magnet that is fixed so as not to rotate, which faces the magnetic pole of the magnet, is made of magnetic and non-magnetic materials alternately arranged in the circumferential direction. A braking member is configured such that a braking magnet is dynamically connected to the connecting member, and the braking member has a cylindrical portion configured by alternately arranging magnetic materials and non-magnetic materials in the circumferential direction. A driven side connecting member is provided to surround the braking magnet body, and has an air gap between the outer peripheral surfaces of both the cylindrical portions of the driving side connecting member and the braking member, and the inner peripheral surfaces thereof face each other. Magnetic powder is enclosed in the gap between the drive-side connecting member and the braking member, and a magnetic material and a non-magnetic material constitute the magnetic pole of the braking magnet or the cylindrical portion of the braking member.
The relative positions in the circumferential direction with respect to the magnetic poles of the coupling magnet or the magnetic and non-magnetic bodies constituting the cylindrical portion of the drive-side coupling member are determined by the mutual dynamic coupling between the drive-side coupling member and the driven-side coupling member. An intermittent drive device characterized in that the driven side connecting member is magnetically tilted by 90 degrees so that braking is applied in the released state.