JPH04151019A - Coupling - Google Patents

Abstract

PURPOSE:To obtain stable transmission of rotation without irregular rotation by transmitting rotation of a drive shaft to an intermediate disk via a link and further to a follow-up shaft via the link. CONSTITUTION:A drive disk 2 is fixed to a drive shaft 1. A follow-up disk 4 is fixed to a follow-up shaft 3. An intermediate disk 5 is provided between the drive disk 2 and the follow-up disk 4. Two first connecting pins 6 are provided on arc of radius r1 for rotary shaft line of the drive shaft 1 on the drive disk 2. Two second connecting pins 7 are provided on arc of radius r2 which is larger than the radius r1 on the side 5a of the drive disk of the intermediate disk 5. The first connecting pins 6 and the second connecting pins 7 are connected by a first link 8. When they are connected, relative length of the radius r1 and the radius r2 is selected in such a way that the first link 8 extends in the direction of tangent for rotary track arc of the first connecting pins 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coupling for connecting a drive shaft and a driven shaft of various devices such as a developing device of an image forming apparatus.

[Prior art] Couplings that connect a drive shaft and a driven shaft, especially couplings that connect a drive shaft and a driven shaft whose axes are shifted from each other, include the Oldham coupling, which connects the drive shaft and the driven shaft with a bellows. Bellows couplings and various other universal couplings are known.

When a fixed position drive shaft and a driven shaft supported movably in one direction perpendicular to the axis are connected by a conventional coupling, the driven shaft vibrates due to self-aligning action, which prevents uneven rotation. There was a problem that the transmission of rotation was unstable.

[Problem R to be solved by the invention] The present invention solves the above-mentioned conventional problems and provides a coupling that can stably transmit rotation without causing uneven rotation even when the drive shaft moves. is the issue.

[Means to solve the problem]

The present invention solves the above-mentioned problem by having a drive disk fixed to a drive shaft, a driven disk fixed to a driven shaft, and an intermediate disk disposed between the driven disk and the drive disk, Two connecting pins are provided protrudingly on the surfaces of the driving disk and the driven disk facing the intermediate disk, respectively, two connecting pins are respectively protrudingly provided on both surfaces of the intermediate disk, and two connecting pins are provided protrudingly provided on each side of the intermediate disk. The connecting pins are connected to the connecting pins of the opposing driving disk and driven disk by separate links, respectively, and among the connecting pins connected by the links, the connecting pin on the driving side is connected in the radial direction from the center of the corresponding disk. The distance is set to be smaller than the radial distance of the connecting pin on the driven side from the center of the relevant disk,
The two connecting pins of the drive disk are thus connected to one of the intermediate shafts by links extending tangentially to the leaf rolling motion.
and the connecting pins on the other side of the intermediate disk are connected to the connecting pins of the driven disk by links extending in the tangential direction of the rotational movement of the connecting bin, respectively. Solved by Kampling.

[Effect]

According to the invention, the rotation of the drive shaft causes the drive disk to rotate, and the movement of the two connecting pins of the drive disk is transmitted via links to the two pins fixed to the intermediate disk.

Furthermore, the movement of the two connecting pins of the intermediate disk due to the rotation of the intermediate disk is transmitted to the driven shaft via the link. The length of the rotating arc radius where the connecting pin of the drive disk side of the intermediate disk is arranged is greater than the length of the radius of the concentric circle with the drive shaft where the connecting pin of the driving disk is arranged, and the connecting pin of the driving disk is By pulling the link in the tangential direction, the rotation is transmitted by pulling the connecting pin of the intermediate disk, and similarly, the connecting pin of the driven disk is longer than the length of the rotating arc radius where the connecting pin on the surface of the intermediate disk on the driven disk side is arranged. The length of the arranged rotational arc radius is large, and the connecting pin of the intermediate disk pulls the link in the tangential direction to pull the connecting pin of the driven disk to transmit rotation.

〔Example〕

The details of the present invention will be explained based on embodiments shown in the drawings.

In FIGS. 1 to 5, a drive disk 2 is fixed or integrally formed on a drive shaft 1. As shown in FIGS. A driven disk 4 is attached to the driven shaft 3.
are fixed or integrally formed. An intermediate disk 5 is arranged between the driving disk 2 and the driven disk 4.

The drive disk 2 has a radius r with respect to the rotation axis of the drive shaft 10.
Two first connecting bins 6 are installed or integrally formed on the arc of l. Drive disk side surface 5a of intermediate disk 5
Two second connecting pins 7 are implanted or integrally formed at positions corresponding to the first connecting pins 6 on a circular arc having a radius r and a larger radius r2. The first connecting pin 6 and the second connecting pin 7
are connected to each other by a first link 8. When connected, the first link 8 extends in the tangential direction to the arc of the rotational orbit of the first connecting bin 6 with a radius r1 and a radius r! Select the relative length of

Similarly, on the surface 5b of the intermediate disk 5 on the driven disk 7 side, two third connecting pins 9 are installed or integrally formed on a circular arc having a radius r with respect to the rotation center line of the intermediate disk 5. . Two fourth connecting pins 10 are implanted or integrally formed on the driven disk 4 at positions corresponding to the third connecting pins 9 on a circular arc having a radius r and a larger radius r. The third connection 79 and the fourth connection pin IO are connected by the second link 11, respectively. The relative lengths of the radius r and the radius r4 are selected so that the second link 8 extends in a tangential direction to the rotational orbit arc of the third connecting bin 9 during connection. Third connecting bin 9
The circular arc radius r3 for arranging is the same length as the circular arc radius r1 for arranging the first connecting bin 6, and the circular arc radius r for arranging the fourth connecting bin 10.

can also be made to have the same length as the circular arc radius r2 at which the second connecting pin 7 is arranged.

At the time of connection, the radius r and the radius r! By selecting the relative lengths of the first link 8, when the rotational driving force is transmitted, as shown in FIG.
The direction of the force f acting on the first connecting bottle 6 is substantially tangential, and a state is obtained in which no radial component force acts on the first connecting bottle 6.

As a result, the drive disk is not tilted due to the alignment action.On the other hand, if the radius r1 and the radius r2 are the same length, as shown in FIG. 6B,
Due to the force f acting on the first link 8, a force in the radial direction and a force in the tangential direction are generated in the first connecting bottle 6,
The drive disk will be tilted due to the centering effect due to the radial component of the force.

The coupling according to the present invention described above can be used, for example, in a laser printer as shown in FIG. 7th
In the figure, in the printer main body 51, a photoreceptor 52 rotates clockwise, is uniformly charged by a charger 53, an electrostatic latent image is formed by irradiation of laser light by a laser light response system 54, and a toner image is formed by a developing device 55. The paper fed from the paper feed cassette 56 is sent to the photoreceptor 52 at the right timing by the registration roller 57, and the visible image is transferred under the action of the transfer charger 58. The photoreceptor is cleaned by a cleaning device 59 and the process from the next charging is repeated.The sheet after transfer is fixed by a fixing device 60 and is discharged to a paper discharge tray 61. In such a laser printer, as shown in FIG. 8, the developing device 55 is constantly pressed by a spring 62 so that the developing roller 63 comes into pressure contact with the photoreceptor 52. The shaft 64 of the developing roller 63, that is, the driven shaft, is connected to the shaft (not shown) of a fixed driving device, that is, the drive shaft, by a coupling shown in FIG.

The driven shaft 64 moves in only one direction, the direction in which it comes into pressure contact with the photoreceptor 52 . If the rotation of the driven shaft 64 is uneven, it may cause uneven development on the photoreceptor.
The coupling shown in the figure allows the developing roller to rotate stably.

〔effect〕

According to the present invention, the rotation of the drive shaft is transmitted via the link to the intermediate disk and further via the link to the driven shaft.
Even when the rotation of the drive shaft, which is fixed in position, moves in one direction and is transmitted to the driven shaft which causes an axis misalignment with the drive shaft, the self-aligning effect of the driven shaft is suppressed and rotation is made evenly. Therefore, stable rotation transmission is now possible.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a coupling according to the present invention, Fig. 2 is an exploded perspective view of a coupling according to the present invention;
The figure is a front view, Figure 3 is a cross-sectional view taken along ■-m in Figure 2, Figure 4 is a cross-sectional view taken along fV-IV in Figure 2, Figure 5 is a cross-sectional view taken along ■-V in Figure 2, and Figure 6 is a cross-sectional view taken along ■-V in Figure 2. 7 is a diagram explaining the operation of the coupling, A is a state according to the present invention, B is a diagram showing a state where the effect of axis misalignment occurs, FIG. 7 is a schematic diagram of a laser printer, and FIG. 8 is a developing device and photosensitive It is a layout diagram of the body. l... Drive shaft 2... Drive disc 4...
Driven disk 3... Driven shaft 5... Intermediate disk 6... First connection pin (connection pin) 7... Second connection pin (connection pin) 8... First link (link) 9. ...Third connection bin (connection pin) IO...Fourth connection bin (connection pin) 11...Second link (link) (A) Figure (B)

Claims (1)

[Claims] A driving disk fixed to a driving shaft, a driven disk fixed to a driven shaft, and an intermediate disk disposed between the driven disk and the driving disk, the intermediate disk between the driving disk and the driven disk. Two connecting pins are provided protrudingly on each side facing the intermediate disk, two connecting pins are respectively protrudingly provided on both sides of the intermediate disk, and the connecting pins protrudingly provided on the intermediate disk are connected to each opposing drive disk. And one of the connecting pins of the driven disk is connected by a separate link, and among the connecting pins connected by the link, the distance in the radial direction from the center of the corresponding disk of the connecting pin on the driving side is the corresponding one of the connecting pin on the driven side. The distance between the two connecting pins of the drive disk is set to be smaller than the radial distance from the center of the disk, and the two connecting pins of the drive disk are each connected to the connecting pin of one side of the intermediate shaft by a link extending tangentially to the rotational movement. A coupling, characterized in that the connecting pins on the other side of the intermediate disk are connected to the connecting pins of the driven disk by links extending in the tangential direction of the rotational movement of the connecting pins.