JPS595228Y2 - reversible electromagnetic clutch - Google Patents

Description

[Detailed description of the invention] This invention is used in a reciprocating drive device for the document feed table of a copying machine, etc., and is equipped with two sets of clutch mechanisms, and by engaging one or the other clutch, rotation in the forward or reverse direction can be achieved. This relates to a reversible electromagnetic clutch that extracts force.

In the case of this type of electromagnetic clutch, as copying machines become smaller, the space factor of the clutch is restricted, and the clutch must be accommodated within this narrow installation space, which requires a smaller clutch.

The present invention satisfies this requirement and at the same time reduces the number of component parts to provide an inexpensive and compact electromagnetic clutch of this type.

First, a conventional reversible electromagnetic clutch will be explained with reference to FIG.

In the same figure, 1 is a yoke with a U-shaped cross section and a casing 2.
is fixed to the inner circumference of the

3 is an annular excitation coil housed in the yoke; 4 is supported on the inner periphery of the yoke 1 via a bearing 5 at the boss portion;
A plurality of arcuate cut-out holes are circumferentially arranged in the vicinity of the periphery of the rotor coupled to the input gear 6, and an outer pole portion and an inner pole portion are formed with the cut-out holes separated from each other.

7 is an armature that is dynamically connected to the bub 8 using a key or the like and is movable in the axial direction, and faces a friction transmission surface, which is also the magnetic pole surface of the rotor 4, with a required gap on one side.

The bubble 8 is fitted onto the output shaft 9, and the output shaft is fitted with a bearing 1.
Supported by 0,11.

Reference numeral 12 is a spring for returning the armature whose one end is fixed to the armature 7, and its tip is brought into contact with the side surface of the bub 8.

A gear 13 is supported on the output shaft 9 by a bearing 14 and is dynamically connected to the rotor 4 by a connecting member 15.

An intermediate gear 16 meshes with the gear 13 and is supported by a shaft 1B fixed to the yoke 17 laterally.

The yoke 17 has a U-shaped cross section and is attached to the casing 2 at its outer periphery.

19 is an excitation coil housed in the yoke 17; 20 is a rotor supported on the inner periphery of the yoke 17 via a bearing 21 in the boss portion; and 22 is dynamically connected to a bub 23 so as to be movable in the axial direction. One side of the armature faces the friction transmission surface, which is also the magnetic pole surface of the rotor 20, with a required gap in between.

The bub 23 is fitted onto the output shaft 9.

Reference numeral 24 denotes a return spring for the armature 22, which is fixed to the armature at one end and is in contact with the side surface of the bub 23 at its tip.

Reference numeral 25 denotes a final stage gear connected to the boss portion of the rotor 20, and although not shown, an intermediate gear is interposed between this gear and the intermediate gear 16.

Reference numeral 26 denotes a mounting flange for attaching the clutch configured as described above to a machine (not shown) used in the casing 2.
It is formed integrally with the side wall member.

21 is a bearing interposed between the output shaft 9 and the mounting flange 26.

In the above configuration, when rotation is given to the input gear 6, the rotation is applied to the rotor 4, the connecting member 15, and the gear 13.
．． 16, an intermediate gear (not shown), and a gear 25 to the rotor 20, and the rotors 4 and 20 rotate in opposite directions through a gear mechanism.

In this state, the yoke 1, the exciting coil 3, the rotor 4,
When current is supplied to the excitation coil 3 of one of the clutch mechanisms, which is composed of the armature 7 and the like, an attractive force acts between the magnetic pole part of the rotor 4 and the armature 7, so that armature is attracted to the rotor side, and this Due to contact friction with the rotor, rotation on the rotor side is transmitted to the armature side, and further transmitted to the output shaft 9 via the hub 8 as rotation in the positive direction, for example.

Further, when current is supplied to the excitation coil 19 of the other clutch mechanism instead of the excitation coil 3, the other armature 22 is attracted to the magnetic poles of the rotor 20 and is brought into pressure contact with the friction transmission surface of the rotor. 20 rotation is transmitted to the armature 22, and further passes through the hub 23 to the output shaft 9.
Rotation in the opposite direction to that in the above case is transmitted to .

Note that the rotation of the output shaft 9 at this time has a constant rotation ratio determined by a group of gears interposed between both the rotors 4 and 20 with respect to rotation in the forward direction.

In such a conventional configuration, the gear 6, which is an input member, is attached to the outer end of one rotor 4, which is one end of the clutch device, so it is not possible to use the end surface 2A of the casing 2 as the mounting surface of the clutch device. This is complicated and difficult, so as shown in the figure, a separate mounting flange 26 that is integrally connected to the casing 2 is provided, and the end face of this flange is used as the mounting surface.

Therefore, the length of the entire device in the axial direction becomes long, and a mounting flange is required, making it unsuitable for use in equipment that requires miniaturization, and at the same time, it becomes expensive.

This proposal solves these problems and its structure is
The embodiment shown in the figure will be explained as follows.

Identical or corresponding parts in the drawings are designated by the same reference numerals, and explanations thereof will be omitted, and only improvements will be explained.

That is, as shown in FIG. 2, the conventional input gear 6 is omitted, and instead, the gear 28 corresponding to the gear 13 is made into a two-stage gear, and one of the teeth is connected to the intermediate gear 16 as in the conventional case. The other tooth portion 28a is engaged with the casing 2.
It engages with an external input drive gear (not shown) through a cutout window 29 provided in the peripheral wall of the
6 is omitted, and instead, a plurality of mounting screw holes 30 are arranged in the circumferential direction on the end face of the yoke 1, which is a component of one of the clutch mechanisms, and the clutch device is directly attached to the machine, etc. using these screw holes. It was designed so that

Note that one tooth portion 28a of the gear 28 may be replaced with a sprocket wheel or a pulley to receive input.

The embodiment of the present invention is constructed as described above, and has a cutout window 29.
When the gear is rotated by an input driving gear (not shown) that meshes with the gear 28 through the intermediate gear 16, this rotation is transmitted to one rotor 4 via the connecting member 15, and at the same time, the intermediate gear 16 is inserted between this gear and the gear 25. The transmission is transmitted to the other rotor 20 through an intermediate gear (not shown) and the gear 25, and both rotors are rotated in opposite directions as in the conventional case, and the rotor 20 is rotated between them with respect to the rotor 4. It rotates with a rotation ratio that corresponds to the gear ratio of the group of gears inserted.

In this state, when current is supplied to one of the excitation coils 3, one of the armatures 7 is attracted and brought into pressure contact with the transmission friction surface of the rotor, as in the conventional case, and the rotation of the rotor is caused by the rotation of the armature and the hub. 8 to the output shaft 9, and when cutting off the power supply to the excitation coil 3 and supplying current to the other excitation coil 19, the other armature 22 is attracted and brought into pressure contact with the transmission friction surface of the rotor 20. , the rotation of the rotor is transmitted through the armature and the hub 23 to the output shaft 9, which rotates with a rotation ratio opposite to that in the above case.

In addition, in the above description, the case where the gear 28 side is used as an input and rotational motion in the forward or reverse direction is extracted from the output shaft 9 side has been explained. However, there is no essential difference in their effects.

The present invention is based on a reversible electromagnetic clutch that combines two sets of clutch mechanisms to convert the rotation direction and rotation ratio, or only the rotation direction, as described above. Since the input or output rotation is obtained from the middle of the two sets of clutch mechanisms through transmission members such as sprockets or pulleys, all gears and input or output sprocket wheels, pulleys, etc. are gathered in one place in the center, making the device that much more compact. Also, since it does not have the input gear 6 at one end unlike the conventional case, it is difficult to attach the device to other machines, etc. A mounting thread L30 is provided on the end face of one yoke 38 without providing the flange 26, and the input gear 6 and mounting 7 can be directly mounted at this part.
The axial length of the entire device can be reduced by the space needed to provide the lunge 26, and at the same time, the number of parts can be reduced, so the device can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of the upper half of a conventional electromagnetic clutch, and FIG. 2 is a side view of the upper half of the electromagnetic clutch showing an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] It is equipped with two sets of clutch mechanisms, and a group of gears that are located between the two sets and have a power connection between the respective rotors and have at least the function of changing the direction of rotation, and one gear in the group of gears is connected to an external A reversible electromagnetic clutch characterized in that it can be coupled to a transmission member for input or output.