JPH03138659A - Driving power transfer mechanism for image carrying body - Google Patents

Abstract

PURPOSE:To constitute the driving power transfer part of a less space and to lessen the impartation of restrictions on the design of the other parts by coaxially connecting a driving shaft of driving power transfer to a supporting shaft of the image carrying body. CONSTITUTION:The coordinates in the direction (x) and direction (y) of an encoder frame 11 are determined to align to the center of a drum 1 when a process unit is mounted to a device body. The encoder frame 11 can turn freely by as much as the amt. of clatters around the given coordinates if this frame is left in this state. A spring 21 is provided in order to regulate the movement of this turning direction to regulate the movement of the encoder frame 11. An encoder shaft 13 breaks through a bushing 15 of an elastic member mounted to a drum flange 14 in this state and the encoder shaft 13 and the drum flange 14 are joined. The effective utilization of the small space is possible in this way and the impartation of the restriction on the design is lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a driving force transmission mechanism for an image carrier in an electrostatic recording device.

[Prior Art] In the above-mentioned apparatus, as a driving force transmission mechanism for the image carrier, a drum gear 4 is conventionally fixed to a drum 1 as an image carrier, as shown in FIG. A configuration is adopted in which driving force is transmitted via a drum gear 4. An encoder 3, which is a speed detection member for the rotating drum 1, is connected to the drum 1, and a latent image is formed on the drum 1 by printing in accordance with the output of the encoder 3.

Alternatively, as shown in FIG. 9, the drum 1 has a drum gear 4.
The encoder 3 is provided in the drive unit 10 of the apparatus main body near the drum 1, and the encoder 3 is arranged in the drive unit 10 of the apparatus main body near the drum 1 to detect the timing of printing. There is.

In addition, in FIGS. 8 and 9, 2 is a process frame, 5a and 5b are bearings, 6 is a fixing knob,
Reference numeral 7 indicates a boss provided on the process frame 2, 8 a flake side plate of the main body of the apparatus, and 9 a positioning hole into which the boss 7 is inserted.

[Problems to be Solved by the Invention] In both of the conventional techniques shown in FIGS. 8 and 9, the process unit and the apparatus main body drive section 10 are connected using gears or the like. However, there are many parts near this connection that must be placed in a narrow space, such as the transfer corona, electrode members to the transfer corona, strip corona, and strip corona electrode members, etc., and the design is restricted due to space issues. giving. Particularly when using a small-diameter drum, each process component is concentrated in a small space, so the space occupied by the drive mechanism has a large influence on other layouts.

This invention was made to solve the above-mentioned problems, and it is possible to effectively utilize a small amount of space and place fewer constraints on the design. The purpose is

[Means and Effects for Solving the Problems] In order to achieve the above object, the present invention provides a system in which, when a removable image carrier is attached to the main body, a driving means provided in the main body is connected to the image carrier. In the driving force transmission mechanism of the image carrier to be connected, the drive shaft of the drive means is positioned coaxially and connected with a degree of freedom to the support shaft of the image carrier that is mounted on the main body and positioned. It is characterized by what it did.

More specifically, the present invention includes a support means provided on the main body frame for supporting and positioning the image carrier, and a drive member movably provided with respect to the main body frame for transmitting rotational force to the image carrier. The apparatus is characterized in that it has a connecting means for positioning and connecting the drive shaft coaxially with the support shaft of the image carrier supported and positioned by the supporting means.

With the above configuration, the drive shaft of the drive means is positioned and connected coaxially with the support shaft of the image carrier with a degree of freedom, so the area around this connection can be configured with a small space. can.

Furthermore, when the image carrier is attached to the main body, the image carrier is supported and positioned on the main body, and the drive shaft is positioned coaxially with a degree of freedom and connected to the support shaft of the image carrier. On the other hand, even if the drive shaft is connected with a slight eccentricity, the drive shaft always coincides with the central axis of the image carrier, and the drive is transmitted smoothly, and vibrations due to positional deviation do not occur.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the embodiment shown in FIG. 1, the process unit will first be explained.

Drum flanges 1 are provided at both ends of the drum 1 as an image carrier.
4 is press-fitted and attached to the process frame 2 via a bearing 5.

A bushing 15 made of an elastic member such as rubber, which is connected to the encoder shaft 13, is attached to the drum flange 14 on the driving side, and a bushing 15 made of an elastic member such as rubber, which is connected to the encoder shaft 13, is attached to the drum flange 14, and a bushing 15 is attached to the drum flange 14 on the other end side of the flange 14, as shown in FIG. 6(a), which will be described later. Slots are provided as shown in .

A plurality of bosses 7 are provided protruding from the process frame 2, and the process frame 2 is positioned in the main body of the apparatus by fitting these bosses 7 into positioning holes 9 provided in the frame side plates 8. The process frame 2 is fixed to the main body of the apparatus by a fixing means such as a knob (not shown) (similar to the knob 6 in FIGS. 8 and 9). Note that the process unit is configured by attaching the drum 1 alone or other process means.

Next, the configuration of the device main body side will be explained. An encoder shaft 13 is supported by bearings 12 provided at both ends of the encoder frame 11, and an encoder 3 is coaxially attached to one end of the encoder shaft 13. A bracket 19 fixes the encoder 3 to the encoder frame 11, and as is clear from FIG. 2, it is attached to the encoder frame 11 with screws 19a. Rotation of the encoder 3 is regulated by this single bragget. The encoder shaft 13 is supported by the encoder frame 11 while its movement in the thrust direction is regulated by the E-ring 20 and the stepped portion 13a of the encoder shaft 13 shown in FIG.

On the encoder shaft 13, as shown in FIG. 4(C), there is a drum gear 4 having a slot in the boss portion.
3 in a free state in the rotational direction of the drum gear 4.

A piece 17 shown in FIG. 4(b) is inserted into the slot of the drum gear 4 via a spring 18 shown in FIG. The position of the drum gear 4 with respect to the encoder shaft 13 is regulated by pressing the drum gear 4 against the E ring 20 by a spring 18.

Further, as shown in FIG. 3, the top 17 is biased toward the drum 1 by a spring 18, and is mounted so as to be movable on the encoder shaft 13 within a range that does not disengage from the aforementioned slot. As is clear from Figure 3, the movement of frame 17 is as follows:
9 is regulated by coming into contact with the drum gear 4, and the other end is regulated by coming into contact with the frame side plate 8 of the main body of the apparatus. Therefore, when the process unit is not installed, the top 7 is regulated by the spring 18. Since it is biased, its movement is restricted while it is in contact with the frame side plate 8.

Encoder shaft 13, frame 17, drum gear 4, spring 18
, the encoder frame 11 including the encoder 3, the stepped screw 16, and the frame side plate 8 are shown.

Encoder frame 11 is D2)DI, T2>Tl
It is attached to the side plate 8 of the device body with stepped screws 16 for this reason. The encoder frame 11 is supported by the side plate frame 8 of the apparatus main body with play (degree of freedom), and the amount of play is at least from the boss 7 provided on the process frame 2 to the drum 1 attached to the process frame 2. A larger amount is required than the tolerance provided to the center of the drum flange 14.

In short, when viewed from the direction of FIG. 2, the center position of the drum 1 with respect to the frame 8 on the apparatus main body side exists within a given dimensional tolerance range. A play greater than this range is required to allow the center of the encoder shaft 13 supported by the encoder frame 11 to move.

Further, as shown in FIG. 2, the encoder frame 11 has a spring 2 fixed at one end to the side plate frame 8 of the main body of the apparatus.
1 is biased clockwise. In addition, in the figure, 22 is a swing gear, 23 is a swing bracket, 24 is a drive gear, 2
5 is a spring.

In the driving force transmission mechanism with the above configuration, when the process unit is inserted into the apparatus main body, first the encoder shaft 13
The tapered end portion of the drum flange 14 enters the fitting hole of the drum flange 14. The process unit is further inserted using the encoder shaft 13 as a guide member. Finally, the process unit is positioned in the apparatus main body by fitting the boss 7 of the process frame 2 into the positioning hole 9 provided in the side plate frame 8 of the apparatus main body. , is fixed to the main body of the apparatus by means of using the knob 6) in FIG.

By being attached to the process unit or the apparatus main body, the position of the drum 1 attached to the process frame 2 is also determined with respect to the apparatus main body.

At this time, since the encoder shaft 13 of the encoder frame 11 is fitted into the drum flange 14, the encoder frame 11 is positioned coaxially with the drum 1 relative to the main body of the apparatus.

When the process unit is attached to the main body of the apparatus as shown in FIG. 2, the X-direction and X-direction coordinates of the encoder frame 11 are determined to match the center of the drum 1. If this continues, the encoder frame 11 will be free to rotate around the given coordinates by an amount corresponding to the play. The spring 21 is provided for the purpose of regulating the movement in this rotational direction, and regulates the movement of the encoder frame 11.

In this step 1, the encoder full13 has a bushing 15 of an elastic member attached to the drum flange 14.
The encoder shaft 13 and drum flange 14 are joined together.

Next, the movement of the drive transmission member will be explained with reference to FIG. When the protrusion of the slot on the drum flange and the protrusion of the piece 17 do not come into contact with each other due to insertion of the process unit, the piece 17 is pushed toward the drum gear 4 and retracted.

However, since the piece 17 is always urged toward the drum flange 14 by the spring 18 as shown in FIG. During operation, the piece 17 enters the slotted portion of the flange 14 and engages with it, thereby transmitting the drive.

Next, the relationship between the drive transmission member and the encoder shaft 13 will be explained. The drum gear 4 and the piece 17 are made of materials with high lubricity and sliding side, and ideally the rotation of the drum gear 4 and the piece 17 drives the drum 1 without equally affecting the encoder shaft, and the rotation of the drum 1 It is desirable that the encoder shaft 13 be rotated through the bush 15, which is a joining member, so that the encoder 3 can be driven without being affected by the drum gear 4 and the piece 17.

However, since a certain amount of friction coefficient exists between the drum gear 4 and the top 17 and the encoder shaft 13, the rotation of the drum gear 4 and the top 17 generates a force that affects the encoder shaft 13. It turns out.

The drum gear 4 and frame 17 can be made of a material with high lubricity and sliding properties, such as polyacetal, or if strength is required, the bearing can be made of metal, thereby reducing the rotation that the drum gear 4 and frame 17 give to the encoder shaft. The torque is approximately several + gfcn +. At this time, the coupling torque between the bushing 15 and the encoder shaft 13 is set to several hundred gf.
If it is set to cm, the influence of the drum gear 4 and the frame 17 can be practically ignored, and a situation close to the ideal can be realized.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

[Effects of the Invention] According to the present invention, by coaxially connecting the drive shaft for transmitting the driving force to the support shaft of the image carrier, the driving force transmitting section can be configured in a small space, and there are no restrictions on the design of other parts. You can give less.

In addition, when the image carrier is attached to the main body, the image carrier is supported and positioned on the main body, and the drive shaft is positioned coaxially with the support shaft of the image carrier with some degree of freedom and is connected. Even if the drive shaft is connected slightly inward from the support shaft, the drive shaft always aligns with the center axis of the drum, so drive transmission is extremely smooth, and vibrations due to misalignment are avoided. do not have.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the configuration of the main parts of an embodiment of the present invention, FIG. 2 is a schematic right side view of the embodiment, and FIG. 3 is a longitudinal sectional view showing the driving force transmission section of the embodiment. 4 is an exploded perspective view of the driving force transmission section, FIG. 5 is a partial view showing the relationship between the encoder and the encoder shaft, and FIGS. 6 and 7 show the encoder frame attached to the side plate frame. FIGS. 8 and 9 are partial cross-sectional views showing the installation structure, and vertical cross-sectional views schematically showing the +R configuration of the conventional driving force transmission mechanism. 1...Drum 2...Process frame 3
...Encoder 4...Drum gear 5...Bearing 06...Knob 7...Boss
8... Frame side plate 9... Positioning hole
10... Drive unit 11... Encoder frame 12
...Bearing 13...Encoder shaft 14...
・Drum flange 15...button 16...
・Stepped screw 17...piece 18...spring 19...bracket 20...E ring 21・
... Spring 22 ... Swing gear 23 ... Swing bracket 24 ... Drive gear 25 ... Spring

Claims (2)

[Claims] (1) In the drive force transmission mechanism of the image carrier that connects the drive means provided in the main body to the image carrier when the image carrier is attached to the main body and is detachable from the main body, the image carrier is attached to the main body and positioned. A drive force transmission mechanism for an image carrier, characterized in that the drive shaft of the drive means is coaxially positioned and connected with a degree of freedom to the support shaft of the image carrier. (2) In a drive force transmission mechanism for an image carrier that transmits rotational driving force to an image carrier that has a support shaft and is detachable from the main body frame, a support that is provided on the main body frame and supports and positions the image carrier. a drive member movable with respect to the main body frame for transmitting rotational force to the image carrier; and a drive shaft coaxial with a support shaft of the image carrier supported and positioned by the support means. A driving force transmission mechanism for an image carrier, comprising a connecting means for positioning and connecting the image carrier.