JPH02138544A - Rotation mechanism - Google Patents

Abstract

PURPOSE:To eliminate poor quality due to non-uniformity in the feed of a driving system by providing a device with a main roller co-axially arranged with the first rotating body and longitudinal rollers co-axially arranged with plural numbers of the second rollers, and thereby constituting the device to drive the first rotating body or third rotating body. CONSTITUTION:When a sun roller 1 is rotated by a motor 12, a paper feed roller 10 co-axially arranged with the sun roller is rotated. And photo-sensitive bodies 111 through 114 are arranged over the rotating surfaces of friction rollers 21 through 24 respectively so that they are inscribed in these rollers 21 through 24 in such a way that these rollers 11 through 24 are pressed with pressure by an elastic ring 3. The photo-sensitive bodies 111 through 114 are composed of parts necessary for copying such as a developing roller, a toner refilling unit and the like. Namely, the sun roller 1 is rotated by the motor 12, then, the roller 10 is rotated, following which, the rolling revolution of the roller 21 through 24 due to friction is made by the roller 1 so that the photo-sensitive bodies 111 through 114 are also rotated accompanied with the aforesaid rolling revolution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating mechanism, and more particularly to a rotating mechanism for a drum in a copying machine, particularly a color copying machine that requires synchronization.

Recently, the level of image quality required has increased, and there is a desire to improve the feeding accuracy of photoconductor drive mechanisms such as copying machines. Generally, a motor is used in a drive unit constituting a recording/reading unit of a copying machine, scanner, printer, etc., and the speed is reduced to a required rotational speed by a mechanical element such as a gear.

FIG. 6 is a diagram showing an example of a rotation mechanism of a color printer, in which 21 is a motor, 22 is a pinion gear, 23 is an intermediate gear, 24 is a paper feed roller, 25 is a first photoreceptor, 2
6 is a second photoreceptor, 27 is a third photoreceptor, and as shown in the figure, the first to third photoreceptors 25 are arranged around the paper feed roller 24.
27, each of which is accompanied by a developing roller, a toner replenishment unit, etc., although not shown. The paper feed roller 24 is rotated by the driving force of the motor 21 that is decelerated by the intermediate gear 23, and the first to third photoreceptors 25 to 27 are also driven by the paper feed roller 24. At this time, a DC motor is often used as the motor 21, which is decelerated in advance by a gear box. Paper feed roller 24
, the first to third photoconductors (in the case of color, the toner is yellow, magenta, cyan, or a combination of these and black) 25 to 27 are required to have stable rotation and high precision without unevenness. As for the drive, with the above-mentioned configuration, uneven rotation occurs especially due to the meshing of the gear teeth.

Particularly when cost is required, the gear accuracy is limited to 4th to 6th grade, and the accuracy cannot be increased unnecessarily. The same applies to other mechanical elements, such as timing belts. In order to improve image quality, it is necessary to eliminate the rotational unevenness that occurs when the teeth mesh as described above.

The present invention has been made in view of the above-mentioned circumstances,
This was done with the aim of eliminating poor image quality in copying machines, etc., which is called jitter or banding, which is caused in particular by uneven feeding in the drive system.

In order to achieve the above object, the present invention includes a first rotating body, a plurality of second rotating bodies disposed around the first rotating body, and a plurality of second rotating bodies arranged around the first rotating body. In a rotating mechanism having a third rotating body inscribed in the second rotating body, each rotating body is in pressure contact with the other rotating body,
a main roller disposed coaxially with the first rotating body; and a follower roller coaxially disposed with the plurality of second rotating bodies; It is characterized by driving a rotating body. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a main part configuration diagram for explaining the operating principle of the present invention. In the figure, 1 is a sun roller, 21, 2 □.

2,,2. 3 is a friction roller, and 3 is an elastic ring. As shown in the figure, friction rollers 2□ to 24 are arranged around the sun roller 1, and each roller is supported by a side plate (not shown). An elastic ring 3 is inscribed on the outer periphery of the friction rollers 21 to 24 so as to apply a pressing force to each roller. That is, when the sun roller 1 is rotated, the friction caused by the pressing force of the elastic ring 3 causes the friction rollers 2□ to 2 to rotate.
4 rotates, and the elastic ring also rotates accordingly, but the friction roller is pivotally supported by a side plate (not shown) and does not revolve. Since the pressing force is applied toward the center of the sun roller, rotational force can be obtained while maintaining the pressing force of each friction roller.

Each friction roller requires a certain degree of freedom in the direction of the center of the sun roller.

FIG. 2 is a perspective view of the main parts for explaining an example of applying the above-mentioned friction roller mechanism to the photoreceptor and paper feed drive of a copying machine. In the figure, 10 is the paper feed roller, 11□ is the 1 photoconductor, 112 a second photoconductor, and 113 a third photoconductor (
114 is a fourth photoreceptor (not shown), 12
is a motor, and as shown in the figure, a paper feed roller 10 is disposed coaxially with the sun roller 1. This paper feed roller 1
Although 0 is not shown, it would be more convenient if the paper was fed by a paper holding mechanism that presses the leading edge of the paper with a claw. The photoreceptors 111 to 114 are arranged on the rotation of the friction rollers 2□ to 24, respectively.
As in FIG. 1, the elastic ring 3 applies a pressing force to the friction rollers 21-24 so that these friction rollers 2□-2. is inscribed in

Although not shown, the photoreceptors 111 to 114 are composed of components necessary for copying, such as a developing roller and a toner supply unit. The sun roller 1 is rotated by the motor 12,
Paper feed roller 10 rotates.

Friction rollers 2□~2. rolls and rotates due to friction, and as a result, the photoreceptors 111-1
1. It also rotates.

3 and 4 show the elastic ring 3 that provides the above-mentioned pressing force.
This figure shows a mechanism for releasing the pressing force of the elastic ring 3 when not in use in order to prevent deformation of the elastic ring 3. In the figure, 4 is a movable friction roller (same as the friction rollers 21 to 24), 5 is a plunger,
6 is an arm, 6□ is a long hole, 7 is a link, 8 is a spring, 9 is a stopper, and the movable friction roller 4 is a sun roller l.
The elongated hole 6 of the arm 6 is rotatably supported on the shaft of
It is pivoted on □. Friction roller 2. ．． 22 is also pivotally supported by a support arm having a similar elongated hole.

The arm 6 is given a clockwise rotational habit by a spring 8 whose one end is secured to a side plate (not shown). When in use, the tip of the arm 6 is pulled open by the link 7 of the plunger 5 fixed to the side plate, and the arm 6 rotates counterclockwise.

It is positioned by hitting the stopper 9.

When the plunger 5 is de-energized when not in use, the arm 6 is rotated clockwise by the spring 8, and the elastic ring 3 and the friction rollers 21.2. A clearance g is generated between the two, resulting in the state shown in FIG. 4, and the pressing force disappears.

FIG. 5 is a diagram showing the paper path. The paper is fed in the direction of the arrow, and the image formed on each photoreceptor is transferred and ejected. In this embodiment, when there are multiple photoreceptors, However, one photoreceptor may be provided coaxially with the friction roller, and the others may be pseudo rollers.

As is clear from the above explanation, according to the present invention, the paper feed roller photoreceptor receives rotational transmission from the rolling of the friction roller, so rotation becomes smooth and high-precision driving with less rotational unevenness is possible. It becomes like this. Therefore, image distortion due to uneven rotation is eliminated, and high-quality images can be obtained. In particular, rotational irregularities caused by meshing of teeth in gears, belts, etc. are eliminated, and the effect is great.

Furthermore, in order to obtain stable rotation of multiple rollers, it is sufficient to arrange the rollers as soon as the drive is transmitted coaxially with the planetary roller.
Further, it goes without saying that if a planetary roller speed reducer is provided between the motor and the sun roller, further improvement in rotation accuracy can be expected. Furthermore, by adopting the configuration shown in FIGS. 3 and 4, deformation of one elastic ring, friction roller, or sun roller can be prevented, and accuracy can be maintained for a long time.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of main parts for explaining the operating principle of the present invention, FIG. 2 is a perspective view of main parts for explaining an example of applying the present invention to a copying machine, and FIG. FIG. 4 is a diagram showing an example of a mechanism for turning on and off the pressing force of the friction roller;
FIG. 5 is a diagram showing a paper path, and FIG. 6 is a diagram for explaining an example of a conventional rotation mechanism. 1... Sun roller, 21-24... Friction roller, 3
...Elastic roller, 4...Paper feed roller, 11□~1
14...Photoreceptor, 12...Motor. Figure 1 Figure 1 Figure 1

Claims (1)

[Claims] 1. It has a first rotating body, a plurality of second rotating bodies arranged around the first rotating body, and a third rotating body inscribed in the plurality of second rotating bodies. , in a rotating mechanism in which the respective rotating bodies are in pressure contact, a main roller disposed coaxially with the first rotating body, and a follower roller disposed coaxially with the plurality of second rotating bodies. and the first rotating body or the third rotating body.
A rotating mechanism characterized by driving a rotating body.