JPS62200053A - Transmission device - Google Patents

Abstract

PURPOSE:To prevent generation of vibration and abnormal sound by performing transmission of drive force from a driving shaft to a follower shaft with an idling member furnished on a rotary member, and allowing the idling member to make followup motion. CONSTITUTION:The drive force from a driving shaft 7 is transmitted to a sleeve shaft 3 through component members constituting a transmission device. Here a coupling member, a second idling gear 18 and a first idling gear 17 to perform transmission are installed on a rotary lever 13, so that the lever 13 serves as a buffer. Accordingly the said sleeve shaft 3 moves with eccentric rotation of a photo-sensitive member 20, and if the span between the sleeve shaft 3 and driving shaft 7 varies, the gears are maintained in proper meshing conditions to assure that no vibration or abnormal sound is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a drive transmission device in a drive device having a drive shaft and a driven shaft arranged parallel to each other so that the distance between the shafts varies.

(Background of the Invention) In the driving device, for example, the driving device is set to a driving state and a non-driving state by approaching and separating a driving shaft and a driven shaft, a driving shaft of a driving source such as an AC induction motor, Conventionally, it is known that a sprocket, timing pulley, gear, etc. is attached via a coupling, and a driven shaft is connected to the driven shaft by a drive transmission device such as a chain, belt, or gear, but the structure is complicated and There are problems such as unstable drive transmission to the driven shaft.

For example, a driving device for driving a developing sleeve of a developing device in a copying machine will be described.

The developing device is disposed at a position facing a drum-shaped, belt-shaped, etc. photoreceptor, and develops a latent image on the photoreceptor by rotating a developing sleeve.

In order to properly develop the latent image, the conditions required of the developing device are strict, and in particular, strict dimensional accuracy is generally required for the gap between the developing sleeve and the photoreceptor (hereinafter referred to as S and D). There is.

Incidentally, there are known copying machines in which the developer can be replaced or a different color toner can be used by attaching and detaching the developing device.
S, D, are set each time the developing device is positioned by a positioning member such as an abutting member or a guide rail. However, because there are variations in the precision of the positioning members, assembly precision, etc., or there are variations in precision between each developer due to the replacement of the developer, D
, S, and D are difficult to stabilize.

In order to solve the above problem, a rotating roller (hereinafter referred to as an abutting roller) is provided coaxially with the sleeve shaft that supports the developing sleeve, and the abutting roller abuts against the photoreceptor to prevent the photoreceptor and the developing sleeve from moving relative to each other. A developing device (hereinafter referred to as a butting roller type developing device) in which the target position, S, and D, are kept constant has been developed.

The developing device is pressed against the photoconductor from behind by a pressure lever, a pressure spring, etc. so that the abutting roller always abuts against the photoconductor, and even when the photoconductor rotates eccentrically, it remains in contact with the photoconductor. Therefore, D, S, D, are always kept constant.

However, even if the relative position of the developing sleeve with respect to the photoreceptor remains constant, the absolute position changes. That is, the sleeve shaft moves and the distance from the drive shaft changes. As a result, the distance between the sleeve shaft and the drive shaft, for example, if the drive transmission device uses a gear mechanism, the distance between the gears fluctuates, making it difficult to rotate the sleeve shaft at a stable speed. There is a problem.

Additionally, due to load fluctuations on the drive shaft side, such as changes in the tension of the chain or timing belt, the abutting roller may move away from the photoreceptor, making it impossible to properly develop the latent image on the photoreceptor. , there is a problem that it has a serious adverse effect on the copied image.

Furthermore, the developing device is provided so that it can be attached to and removed from the copying machine. For example, as shown in FIG. 7 (a), the developing device 1 is inserted in the direction of the arrow, and as shown in FIG. The device 1 is pushed in the direction of arrow B, and is mounted by pressing the device 1 so that the rollers 4 abut against the photoreceptor 20 as shown in FIG. In this case, the sleeve shaft has to approach and separate from the drive shaft, and complex couplings are required to transmit drive from the drive shaft to the sleeve shaft, making the drive transmission mechanism complicated. There is a point.

In the conventional drive device, the drive transmission device has various problems as described above, and a practically sufficient one has not been developed.

(Object of the Invention) The present invention was developed in view of the conventional circumstances, and provides a drive device having a drive shaft and a driven shaft arranged parallel to each other so that the distance between the shafts varies. It is an object of the present invention to provide a drive transmission device having an hour wheel structure that can reliably transmit drive and smoothly connect and disconnect the drive transmission.

(Structure of the Invention) The structure of the present invention is a drive device having a drive shaft and a driven shaft arranged parallel to each other so that the distance between the shafts varies, the drive having a drive shaft gear provided on the drive shaft. A member, a driven member including a driven gear not provided on the driven shaft, a rotating member provided rotatably within a predetermined range around the driving shaft, and meshing with the first idle gear and the driven shaft gear meshing with the driving gear. a second idle gear;
It is freely installed and both have play in the direction of rotation to generate force.
1. A drive transmission device characterized by comprising: a blown idle member;

(Example) The present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a perspective view of a main part conceptually showing a driving device for a developing device in a copying machine according to an embodiment of the present invention. Second
The figure is a partially cross-sectional plan view of the drive device shown in FIG. 1, showing a state in which the developing device is butted against the photoreceptor. FIG. 3 is a perspective view of the idle member, which is the main part of the drive device. FIG. 4 is an assembled view of the idler member, FIG. 5(a) is a front view of the idler gear, and FIG. 5(b) is a side view of the idler gear. FIG. 6 is a diagram illustrating the relationship of the main parts of the drive device in the operation process of abutting the developing device against the photoreceptor.

In FIGS. 1 and 2, reference numeral 1 denotes a developing device of the abutting roller type, which is shown in FIG. 7 (A) described above.

It is provided so that it can be attached and detached according to the steps (b) and (c). 2 is a developing sleeve containing a magnet roller (not shown), and 3 is a sleeve shaft that supports the developing sleeve 2 and is rotatably provided in the frame of the developing device 1.

Reference numeral 4 denotes a third abutment roller rotatably provided on the sleeve shaft 3, which abuts against the photoreceptor 20 as shown in FIG. The interval or S and D are set constant. 5 is a driven gear fixed to the sleeve shaft 3, and 6 is a first abutting roller rotatably provided at the end of the sleeve shaft 3.

Reference numeral 7 denotes a drive shaft which is rotatably provided in the machine frame 8 via a bearing 9, and a drive gear 10 is fixed to one end and a swimming pulley 11 is fixed to the other end. A timing belt 12 driven by an AC induction motor (not shown) or the like is stretched around the swimming pulley 11 .

Reference numeral 13 denotes a rotary lever that is rotatably supported by a bearing 9, and as shown in FIG.
The range of swing in the directions of arrows X and Y is regulated.

16 to 19 are members constituting an idle member, 16 is an intermediate shaft supported by the rotary lever 13, and 17 is a first shaft rotatably supported by the intermediate shaft 16 and provided so as to constantly mesh with the drive gear 10. Idle gear (2) 8 is a second idle gear rotatably supported by the intermediate shaft 16 and provided so as to mesh with the driven gear 5 when the developing device 1 is installed and positioned; 19 is a second idle gear with the developing device 1 attached thereto; When positioning
This is a second abutting roller that abuts against the abutting roller 6 and regulates the distance between the sleeve shaft 3 and the intermediate shaft 16 so that the driven gear 5 and the second idle gear 18 mesh appropriately.

In addition, on one end surface of each idle gear 17, 18, there are two convex portions 180 with an opening of 60°, as shown in FIG.
They are provided in symmetrical positions, and when assembled into the idler member shown in FIG. 3, they are assembled so that the convex portions a of the idler gears 17, 18 do not come into contact with each other, as shown in FIG. 4. Therefore, each idle gear 17,18 has 6 in the direction of rotation.
They will be coupled with a play of 0'.

Further, the second abutment roller 19 is rotatably supported by the coupled convex portion a (hereinafter referred to as a compression portion). 20 is a photoreceptor.

The drive device for the developing device 1 shown in FIGS. 1 and 2 is configured as described above, and the driving force from the drive shaft 7 is transmitted to the drive gear 10, the first idle gear 17, the coupling portion, and the second idler. The drive is transmitted to the sleeve shaft 3 sequentially through each member constituting the drive transmission device, such as the gear 18 and the driven gear 5.

At that time, since the first idle gear 17, the coupling part, and the second idle gear 1, which transmit the drive between the driven gear 5 and the driving gear 10, are provided on the rotary lever 13, the rotary lever 13 acts as a shock absorber. However, when the sleeve shaft 3 moves due to eccentric rotation of the photoreceptor 20, etc.
Even if the distance between the gears and the drive shaft 7 changes, the gears are maintained in an appropriate meshing state, and the drive transmission between the shafts is smooth without vibration or abnormal noise. It will be done. Furthermore, even if load fluctuation occurs on the drive shaft 7 side due to tension fluctuation of the timing belt 12, etc., the rotary lever 13
This is absorbed by the displacement of the sleeve shaft 3, and the variation in the distance between the shafts is prevented without moving the sleeve shaft 3.

The developing device 1 is installed as shown in FIG. 7(a) as described above.

The connecting operation of the drive device is performed in accordance with the steps (b) and (c) as follows.

When the developing device 1 is pushed forward, the driven gear 5 and the second idle gear 18 reach the contact state shown in FIG. 6 (B) from the non-contact state shown in FIG. 2
The driven gear 5 and the second idle gear 18 reach a meshing state when the driven gear 5 hits the abutting roller 19.

On the other hand, the developing device 1 is pushed further because the third abutting roller 4 has not yet reached the position where it abuts against the photoreceptor 20.
The third abutting roller 4 abuts against the photoreceptor 20 and the developing device 1
Until it is positioned, the second abutting roller 19 is pushed up by the first abutting roller 6, and the second idle gear 18 is pushed and rotated by the driven gear 5, so that the rotation lever 13 is rotated. . As a result, the driven gear 5 and the second idle gear 18 are meshed as shown in FIG. 6(C).

As described above, the second idle gear 18 is connected to the rotary lever 13.
Therefore, even after the driven gear 5 and the second idle gear 18 are engaged and the drive device is properly connected, the developing unit 1 can be appropriately positioned.

Therefore, even if there is a difference in accuracy between the replaced developing devices, the difference is absorbed by rotating the rotary lever 13, and no matter which developing device is used, the connection of the drive device and the positioning of the developing device are easy. Done properly.

Further, since the second idle gear 18 and the driven gear 5 are arranged in the positional relationship shown in FIG. 17 and the second idle gear 18 are coupled with play in the rotational direction, so that when the driven gear 5 contacts the second idle gear 18, it is possible to reliably prevent the tips of the teeth from interfering with each other. The engagement between the two can be started more smoothly, and when the two are separated, the separation can be started more smoothly.

The drive transmission device of the present invention is applicable not only to a drive device for a butt-roller type developer in a copying machine, but also to a drive device for a pond type developer, a fixing device of a copying machine, a paper feeder, etc. Needless to say, the present invention can be applied to drive devices for devices other than copying machines, and can also be applied to drive devices in which the drive shaft side is movable.

(Effects of the Invention) The drive transmission device of the present invention achieves the following effects because the drive transmission between the drive shaft and the driven shaft is performed by the idler member provided on the rotating member.

(2) Even if the distance between the axes changes, the idler member follows, so the drive transmission between the two axes is reliably performed without generating vibration or abnormal noise.

■ Even if load fluctuations occur on the drive shaft side, the load fluctuations are absorbed by the idle member and do not affect the driven shaft side. Therefore, the driven shaft is not moved due to load fluctuations on the drive shaft, as in the conventional case, and the distance between the shafts is maintained appropriately.

■ When the drive shaft and the driven shaft are brought closer and separated, the drive transmission between the two wheels is connected and disconnected by the driven gear and the second idle gear meshing and disengaging.
Since the idle gear is provided on the rotating member, the driven gear and the second idle gear can smoothly engage and disengage.
Drive transmission between the two wheels is smoothly connected and disconnected.

■ Furthermore, since the first idle gear and the second idle gear are cambred with play in the rotation direction,
When the driven gear and the second idle gear come into contact, the tips of the teeth do not interfere with each other, and the meshing of the two gears starts more smoothly, and the disengagement of the two gears also starts more smoothly.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts of an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view of the idler member, FIG. 4 is an assembled view of the idler member, and (a) of FIG.
5 is a front view of the idle gear, FIG. FIG. 4 is an explanatory diagram of the operation of wearing the device. 1...Developing device, 2...Developing sleeve. 3... Sleeve shaft, 4... Third abutment roller. 5... Driven gear, 6... First abutting roller. 7... Drive shaft, 8... Machine frame. 9... Bearing, 10... Drive gear. 13...Rotary lever, 16...Intermediate shaft. 17...First idle gear, 18...Second idle gear 919...Second abutting gear 0.20...Photoreceptor. a...Protrusion. Patent applicant Konishiroku Photo Industry Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 (a) (b) Figure 6 Figure 7

Claims (3)

[Claims] (1) In a drive device having a drive shaft and a driven shaft arranged parallel to each other so that the distance between the shafts varies, a drive member having a drive gear provided on the drive shaft and a drive member provided on the driven shaft A driven member having a driven gear, a rotating member rotatable within a predetermined range around a drive shaft, a first idle gear that meshes with the drive gear, a second idle gear that meshes with the driven gear, and a second idle gear that meshes with the driven gear. A drive transmission device comprising an idler member in which a first idler gear and a second idler gear are rotatably provided on the rotating member and are coupled with play in the rotational direction. (2) The driven member has a first abutting roller rotatably provided on the driven shaft, and the idle member is rotatable at a portion where the first idle gear and the second idle gear are coupled. 2. The drive transmission device according to claim 1, further comprising a second abutting roller provided to abut against the first abutting roller. (3) The drive transmission device according to claim 1 or 2, wherein the drive device is a drive device for a developing device of a butting roller type in a copying machine.