JPS6032062B2 - Reciprocating rotation transmission device - Google Patents

Description

[Detailed description of the invention] BACKGROUND OF THE INVENTION This invention relates generally to reciprocating rotational transmission devices.

Specifically, the present invention relates to a reciprocating rotation transmission device that outputs the drive from a drive source rotating in one direction as reciprocating rotational motion. More specifically, the present invention relates to a reciprocating rotation transmission device that is optimal for reciprocating the document table of a copying machine, reciprocating the optical system, and the like. Many types of drive mechanisms are known in which two electromagnetic clutches are used to reciprocate the document table or the optical system in a slave copying machine.

An example of this will be explained with reference to FIG. 1 as follows. In FIG. 1, reference numeral 1 denotes a motor whose rotation is outputted by a rotating gear 2, and the rotation of the rotating gear 2 is transmitted to a gear 3.

A rotating shaft 4 of the gear 3 is rotatably supported by frames A and B, and a pulley 5 and gears 6 and 7 are integrally provided on the rotating shaft. The rotation of the pulley 5 is used by the belt 8 to rotate a photosensitive drum or the like (not shown). The rotation of the gear 6 is transmitted to the input gear 9 of the reciprocating clutch, and the rotation of the gear 7 is transmitted to the input gear 11 of the reciprocating clutch via an idler gear 10 that changes the direction of rotation. In this way, the rotation of the motor 1 keeps the pulley 5 and gears 9 and 11 in a constant state of rotation. On the other hand, a winding pulley 1 around which a wire 12 is wound is used for reciprocating the document table, reciprocating the optical system, etc.
3 is a rotating shaft 14 rotatably supported by frames A and B.
It is integrated with. This rotating shaft is configured to rotate together with a reciprocating clutch rotor 15 and a reciprocating clutch rotor 16. The gears 9 and 11 are connected to a rotating shaft 14
is held rotatably. In this state, the gear 9 that excites the coil 17 of the reciprocating clutch and the rotor 15 work together to rotate the winding pulley 13 in the direction of arrow a. Furthermore, when the coil of the reciprocating clutch is excited, the gear 11 and rotor 16 are integrated to rotate the winding pulley 13 in the direction b. The conventional reciprocating rotation transmission device as described above does not satisfy the following conditions required for the reciprocating movement of the document table or optical system in a copying machine.

That is, (1) When moving the document table or optical system for exposure, the moving speed of the document table (optical system) and the moving speed of the photoreceptor, which is being moved in one direction, are synchronized and driven.

During this exposure movement, the projected image of the original is projected onto the photoreceptor, so in order to obtain a clear image, this reciprocating mechanism is subject to variations in precision of mechanical parts, rattling, vibrations of other mechanical parts, etc. Special consideration is required to avoid being affected by unstable factors. Even when the document table or the optical system is moved to the light exposure starting position, the photoreceptor is always moving in one direction, but it is moved at high speed because it has no relation to the projection of the document image. (2) Conventionally, chains have been used as power transmission means, but these chains tend to generate noise when driven, making them unsuitable for use in copying machines operated in offices.

Therefore, a mechanism with low noise is required. In order to keep the noise low, it is necessary to drive with a belt that has a low noise level. However, belts have a much lower tensile strength than chains, so in order to transmit the required amount of power, the belt must move farther. In this case, some kind of speed reduction device is inevitably required between the belt and the reciprocating movement of the document table (optical system). (2) In addition, even though this reduction gear is provided, it is increasingly required that it be small and highly reliable.

An object of the present invention is to provide a reciprocating rotary drive device that satisfies the above technical problems.

This will be explained in detail below using the drawings. In Figure 2, 1
Reference numeral 9 denotes a motor with a gear head, and its output shaft 201 is fixedly provided with two output pulleys 21 and 22, one of which has a toothed belt 23 that drives a photosensitive drum or the like (not shown). is at stake.

A toothed belt 25 for transmitting drive to the large pulley 24 is suspended around the other output pulley 21 . Large pulley 24
is rotatably supported via a bearing metal 30 on an output shaft 31 which is rotatably supported on frames C and D (see FIG. 3 for D). The large pulley 24 serves as an input gear of the reciprocating clutch, and an internal gear 26 is cut inside the large pulley 24 and meshes with a first gear 27 constituting an idler gear. This idler gear 2
71 is integrated with a second gear 278 via a shaft 272 that is rotatably supported by frames C and D (see Fig. 3 for D), and this second gear 273 is connected to the input gear 28 of the reciprocating clutch. They are engaged and in a transmission state. input gear 28
is rotatably supported on the output shaft 31 via a bearing metal 38. In this way, the rotation of the motor 19 keeps the large pulley 24 and the gear 28 in a constantly rotating state. In the above configuration, the large pulley 24 is held on the output shaft 31 by the bearing metal 301 together with the clutch support pole element 29 which is spline-coupled with the large pulley, and can freely rotate around the output shaft by the output pulley 21 belt 25. A stator 32 of the reciprocating clutch is attached to the output shaft 31 via a bearing metal 33. This stator 32 is hooked to the frame C by a lever 34 fixed thereto, so that the stator 32 is not dragged and rotated by the rotation of the output shaft 31. The rotor 36 is fixed to the output shaft 31 by a pin P. When the coil 35 of the reciprocating clutch is excited, the saddle pole 29 is connected to the rotor 3.
6 and the rotation of the large pulley 24 is transmitted to the rotor 36. The outer periphery of the rotor 36 is wrapped around a pulley 36' for a drive wire rope 37 for moving the document table or optical system.
The document table optical system that winds up this wire is moved in one direction by this wire rope. At this time, since the diameter of the large pulley 24 is set larger than the diameter of the winding boley 36', the moving speed of the belt 25 is farther than the moving speed of the wire rope 37, and therefore its tension is greater than the tension of the wire rope 37. It has been reduced during. Therefore, the load on the belt 25 can be extremely small. Also, according to this configuration, the large pulley 24 and the winding booley 36
' The number of intervening castles as power transmission members between the two is minimized. Furthermore, since a belt rather than a chain is used as the transmission element, there is less noise. On the other hand, the input gear 28 of the forward clutch, which is constantly rotated by the motor from the large pulley 24 through the idler gear 27, is rotatably held on the output shaft 31 by the bearing metal 38 together with the stranded pole 39 which is splined to the input gear 28. has been done.

When the energization to the coil 35 of the forward clutch is cut off, the connection of the forward clutch is cut off, and the coil 40 of the forward clutch is energized, the saddle pole 39 of the backward clutch is connected to the output shaft 31 by the pin P.
2, the rotation of the input gear 28 is transmitted to the output shaft 31, causing the output shaft 31 to rotate. Since the output shaft 31 is connected to the rotor 36 of the forward clutch, that is, the winding pulley 36', by a key P, it ultimately drives this pulley.

As mentioned above, the power is transmitted to the input gear 28 of the forward clutch through the internal gear 26, idler gear 27, and input gear 28, so during the backward movement, the rotation direction of the pulley 36' is the same as that of the large pulley 24. is the opposite. Further, in this embodiment, the gears 27 and 273 are the same gear, and the internal gear 27
, and the tooth ratio of the input gear 28 is 2, so it is driven at twice the speed. FIG. 3 shows this embodiment in a schematic diagram for easy comparison with FIG. 1, which is shown as a conventional example.

The output of the motor 19 is transmitted to the large pulley 24, which rotates in the direction of arrow C, for example.

This rotation is transmitted to the input gear 28 of the forward clutch through the internal gear 26, gear 27, shaft 272, and gear 273 in the opposite direction (arrow d) to the large pulley and at twice the rotation ratio. When the clutch coil 35 or the four channels are energized, power is transmitted through each clutch face, and the rotation in the C direction or the d direction is output to the pulley 36'. The embodiment of the invention shown in FIG. 3 and the subsidiary example shown in FIG. 1 will be compared below.

■ In the conventional example, when moving forward, it is closed. Backlash at the meshing part (
The motor 1 and the pulley 13 are connected via backlash (backlash), and are directly affected by instability caused by backlash.

Moreover, there are many intervening parts. Therefore, accuracy, stability, and reliability inevitably deteriorate.The present invention uses a belt direct motor 19 and pulley 3 that, in principle, does not cause backlash during forward movement.
6' will be combined.

Moreover, there are few intervening parts. Therefore, accuracy, stability, and reliability are high. ■ In the conventional example, the motor 1 is located at a position away from the power transmission path that connects the photoreceptor drive belt 8 and the winding pulley 13, and moreover, it is disconnected due to backlash in the part A. It is in the same position.

In other words, it is rotating at a very high speed, so this belt ←→
A damping effect cannot be expected due to the rotor (of the motor) having a very large inertia factor as seen from the power transmission system of the pulley 13. Therefore, during the exposure process, the projected light image is subject to minute vibrations and cannot be clearly formed. In the present invention, the large pulley 24, which is a large rotor with a very high rate of inertia, is located between the winding pulley 36' and the drive belt 23, and is connected to the driving belt 23 without any waviness, so that minute vibrations on the winding pulley side are also avoided. This has the effect of firmly suppressing minute vibrations on the belt 23 side (on the photosensitive drum side).

■ The conventional example has a complicated structure with many parts, and the overall size is large. Therefore, the accuracy and reliability are low and the cost is high. The present invention has fewer parts, is simpler, and has a smaller overall size.

Therefore, the accuracy and reliability are high and the cost is low.As explained in detail above, the present invention has two configurations: 1. Two sets of clutches are mounted on a common shaft; 2. An input gear to the first clutch This was realized by using an internal gear as the input gear, 3 using an external gear as the input gear to the second clutch, 4 disposing an idler between these two gears, and 5. The addition of a belt pulley for input has made it even more effective.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional reciprocating rotation transmission device, FIG. 2 is a structural explanatory diagram showing a specific embodiment of the reciprocating rotation transmission device of the present invention, and FIG. 3 is a schematic diagram thereof. In the figure, 19 is a motor, 21 and 22 are output pulleys, 24 is a large pulley, 26 is an internal gear, 27 is an idler gear, 28 is an input gear, 36 and 41 are rotors, and 35
, 40 is a clutch. Hair No Medicine a Figure 3 Diagram N Bran

Claims (1)

[Scope of Claims] 1. A rotating shaft 31, and a large pulley 24 that is provided with an internal gear 26, is rotatably provided on the rotating shaft, and is connected to a drive source via a belt.
and an input gear 28 rotatably provided on the rotating shaft,
an idler gear 27 for connecting the internal gear of the large pulley and the input gear, a first connecting means 36 for connecting and disconnecting the large pulley and the rotating shaft, and the input gear and the rotating shaft. A reciprocating rotation transmission device characterized by having a second connecting means 41 for connecting and disconnecting the.