JPS6123406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic coupling device that can perform power coupling or braking intermittently without a control device for switching or opening/closing the power source, and is applicable to printers, typewriters, etc. It is an object of the present invention to provide a coupling device that is convenient for use in a drive device that requires intermittent drive, such as paper feed in a copying machine or film feed in a projector.

The present invention will be described below with reference to the illustrated embodiments. In the drawings, reference numeral 1 denotes a tip-shaped drive-side connecting member which is rotatably supported on a fixed shaft 3 by a bearing 2 at the inner periphery of the open end. Note that the drive side connecting member 1
The cylindrical part of is composed of magnetic and non-magnetic materials arranged alternately in the circumferential direction, and these magnetic and non-magnetic materials are of the same quality and occupy symmetrical positions with respect to the center. There is. Reference numeral 4 denotes a driving gear fixed to the outer periphery of the open end of the driving side connecting member 1, and 5 denotes a tip-shaped driven side connecting member made of a magnetic material, which is connected to a suitable fixing part by a bearing 7 at a shaft part 6 connected to the bottom. The inner circumferential surface of the cylindrical portion is concentrically opposed to the outer circumferential surface of the cylindrical portion of the drive-side coupling member 1 with a gap in between. Reference numeral 9 indicates magnetic powder filled in the gap between the outer circumferential surface of the driving side connecting member 1 and the inner circumferential surface of the driven side connecting member 5, and 10 and 11 indicate the outflow of the magnetic powder 9 from this accommodation gap. A sealing member is provided at both ends of the magnetic powder accommodation gap to prevent the magnetic powder from occurring.

Reference numeral 12 denotes a magnetic body, which may be an electromagnet, but in this embodiment, a permanent magnet is shown. is facing.

The embodiment of the present invention is constructed as described above, and when used as a clutch, the transmission mechanism (none of which is shown) and the gear 4 are driven by a drive source (not shown).
When the drive-side connecting member 1 is rotated via the
Due to this rotation, the magnetic material part and the non-magnetic material part constituting the cylindrical part of this connecting member are alternately connected to the magnet body 1.
While facing the magnetic pole of No. 2, magnetic flux flows through this magnetic material portion to the magnetic powder 9 and the driven-side connecting member 5, and the magnetic powder is magnetized, and the magnetic flux flows between the particles of these powders and between them. A magnetic attraction force acts between the connecting members on the driving side and the driven side, and they are dynamically connected, that is, the clutch is in a connected state,
Rotation of the driving side connecting member 1 is transmitted to the driven side connecting member 5. When the non-magnetic part of the drive-side connecting member 1 faces the magnetic pole of the magnet body 12, the magnetic flux path is blocked by the non-magnetic material, so that the magnetic flux that reaches the magnetic powder part 9 disappears, and the particles of the powder The magnetic attraction force that acts between them disappears, and the clutch becomes released, cutting off the transmission of power to the driven coupling member. Such an action is repeated as the drive-side coupling member 1 rotates, and each time the magnetic portion and the non-magnetic portion of the coupling member alternately pass through positions opposite to the magnetic poles of the magnet body 12. 1 is intermittently transmitted to the driven-side connecting member 5.

The above is an operation for a clutch, but when used as a brake, the drive side connecting member 1 is fixed so as not to rotate, and the magnet body 1 is fixed so that it does not rotate.
2 has a structure that can be rotated, and the driven side connecting member 5
is the braked side and is dynamically connected to the braked body. In such a configuration, when the magnet body 12 is rotated by manual operation or the like and its magnetic pole part is opposed to the magnetic part of the connecting member 1, magnetic flux is applied to the magnetic powder 9 through the magnetic part as in the case of the clutch described above. flows, a coupling force due to magnetic attraction acts between the connecting members 1 and 5, and braking is applied to the connecting member 5, which is the side to be braked, and the magnetic body 12 is operated to move the magnetic pole part of the connecting member 1 to the non-coupling member 1. When facing the magnetic part, the magnetic flux passing through the magnetic powder 9 part disappears, so the dynamic coupling force between the two connecting members disappears, and the braking on the connecting member 5 is released.

As is clear from the above, when the present invention is used as a clutch, regular intermittent transmission is performed, so intermittent drive is not required, such as for paper feeding in printers, typewriters, copiers, etc., or film feeding in projectors. It can be applied to drive devices that have a wide range of uses, and it does not have parts that generate noise like friction-type clutches, and the only part that wears out is cheap magnetic powder, so it can be replaced. It is extremely economical as it can be used semi-permanently with only one arm, and allows for smooth starting and stopping of the cushion.In addition, by using a permanent magnet as the magnet body, there is no need for a power supply or control circuit. Of course, even in the case of an electromagnet, there is an effect that intermittent driving can be performed simply by maintaining a constant current without requiring a complicated on/off control circuit.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view, and FIG. 2 is a cross-sectional view. DESCRIPTION OF SYMBOLS 1... Drive side connection member, 5... Drive side connection member, 9... Magnetic powder, 12... Magnet body.

Claims (1)

[Claims] 1. A drive-side connecting member having a cylindrical peripheral wall made of magnetic and non-magnetic materials arranged alternately in the circumferential direction; a driven-side connecting member facing each other with a distance therebetween; magnetic powder filled in the gap existing between the connecting member and the driving-side connecting member; and an inner periphery of the cylindrical portion of the driving-side connecting member. A magnetic coupling device comprising a magnet body with magnetic poles facing each other on its surface.