JPS63208875A - Driving device for development - Google Patents

Abstract

PURPOSE:To simplify the construction of the titled device and permit assembly to a single unit without requiring space by driving only the working elements of respective developing devices by a motor to be exclusively used for development. CONSTITUTION:All the working elements of the respective developing devices are driven by respective plates and the driving units assembled to the plates and a piece of the motor which is to be exclusively used for development and is integrally mounted on the unit. The assembly of the driving systems for the developing devices including the developing devices to the single unit of a smaller size is thereby permitted and the stable developing performance is exhibited always with the constant rotating operation without receiving the influence of the fluctuation in the load of the main unit of an apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a developing drive device in a recording apparatus including a plurality of developing devices, such as a color electrophotographic copying machine.

[Background of the invention]

In a color electrophotographic copying machine, a color toner image is usually formed by combining toner images of each color, such as floor, blue, and black, so toner of each color, for example, red, blue, and black, is accommodated on the circumference of a photoreceptor drum. Three developing devices are provided, and each monochrome toner image is superimposed by repeated rotation of the drum.

Each of these developing devices needs to alternately perform the developing action of each unique single color toner according to the rotation period of the photoreceptor drum, so the operating elements such as the developing sleeve and magnetic meal are independent of each other. It must be equipped with a drive transmission system that operates properly.

In order to enhance the developing effect during development, each developing device is driven by the aforementioned drive transmission system in a state where the circumferential surface of the developing sleeve is positioned so that the developing gap can be maintained at a correctly set dimension with respect to the circumferential surface of the photoreceptor drum. However, as is well known, the developing device is often cleaned and inspected to remove toner lumps and foreign matter, and is removed from the copying machine each time. It is also necessary to be able to release the G&P, and it is desirable that this operation be performed simultaneously for each development G&position in one operation.

[Problem that the invention seeks to solve]

In order to meet these conditions, it generally requires multiple power sources or a complex drive transmission system, resulting in a large-scale structure that occupies a large space inside the copying machine, making it difficult to downsize or reduce the size of the device. Price was an obstacle.

As a result of solving and improving this point, the present invention aims to provide a developing drive device for a copying machine that has a simple structure, does not require space, can be made into a unit, and also has the function of maintaining the developing gap. This is what I did.

[Means for solving problems]

The above object is achieved by a development drive device characterized in that a dedicated development motor is provided to drive each operating element in a plurality of development devices, and the development dedicated motor drives only each operating element of each development device. be done.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1 to 4.

The drawing tjS1 shows a side view of the developing drive device of the present invention viewed from above in a partially unfolded state, so the upper part of the drawing corresponds to the front of the copying machine body, and the lower part of the drawing corresponds to the back. Moreover, FIG. 2, FIG. 3, and FIG. 4 show the main parts of the plane from the directions of arrows A and B.

1 is a photosensitive drum; 2 A, 2 B, and 2 C are developing devices each containing toner of red, blue, and black colors; 3 is a side plate of the developing device on the back side of the developing device in which the developing device is installed; be. Reference numerals 4 and 5 denote a pair of base plates in which the developing drive device of the present invention is installed and housed in the space formed by the three stays 6, and are integrally attached to the storage side plate 3 by a plurality of mounting screws 7. It looks like this.

The developing cage is housed between two fixed substrates (not shown), front and back, forming the main body of the recording device, and the elongated holes 8 and rows 29 provided in the side plates of each of the developing cages face the inside of the fixed substrate. A pair of id bins 10 and id rails 11 are engaged with or placed on the id rails 11, and are supported so as to be movable in the horizontal direction. Due to the action of the tension spring 13, the developing devices are biased to the left, that is, to move the developing devices away from the photoreceptor drum 1. When the recording device is in operation, a pair of front and rear cam members fixed on the through shaft 14 of the fixed substrate are pressed. 15 presses the suppression bottle 16 on the side plate of the storage to the right to move the development storage onto the photosensitive drum 1 as shown in FIG.
It is designed to be moved to a position close to and held in that position.

Note that in a state where the developing device occupies a position close to the photoreceptor drum 1, each of the developing devices 2A, 2B, and 2C is biased by an elastic member (not shown) that acts individually, so that the magnetic roll pongee 21 Abutment roller 2 installed coaxially with
2 is brought into pressure contact with the circumferential surface of the photoreceptor drum 1 to maintain the developing gap between the circumferential surface and the developing sleeve 23 at a predetermined dimension.

Furthermore, each of the developing devices has a stepped gear G1 fixed to the ring end of the magnetic roll pongee 21 and teeth 11G5 fixed to the shaft end of one stirring shaft 24 protruding from the outer wall facing the storage side plate 3 on the back side. I'm letting you do it.

The stepped tooth JtLG1 is connected to a gear G4, which integrates the developing sleeve 23, through an even number of gears (not shown), an upper gear G2, and an intermediate gear G3. In contrast, the rotational speed of the developing sleeve 23 is reduced to 250 r, p, I++,
and rotates in the opposite direction.

Further, the gear G5 is connected to the gear G7 through a coaxially fixed gear G6, rotates in the opposite direction to the other stirring shaft 25, and is further connected to the gear G8, and is coaxially integrated with a scraping roll. The shaft 26 is also rotated.

Therefore, the gear G1 and the gear G5 of the specified developing device
When power is transmitted to the magnet roll 21A1
All the operating elements of the developing device including the developing sleeve 23 are driven, and their developing action visualizes the electrostatic latent image on the circumferential surface of the photoreceptor drum 1 to form a specified monochromatic toner image. It is now possible to do this.

On the other hand, a developing motor M is attached to the base plate 5, and a gear Gll fixed to the shaft of the motor M is connected to a coaxial gear G12 and a gear G12, which is coaxial with the shaft of the motor M.
It meshes with the gear G13 that is integrated with the arm W.

The boot 17 P L 1 is connected to each of the developing devices 2 A, 2.
B.

Each 7"-
') PLA, PLB and Jt7 A timing bell) B which is applied with tension by tensile pulley PL2 is passed between PLA, PLB and Jt7PLC, so that the rotation of the motor M is transmitted to the respective pulleys PLA, PLB and VPLC. It has become.

Further, each of the pulleys has a shaft 31 that is pivotally attached to the base plate 4 to 5 passing through each pulley, and when the electromagnetic clutch CL attached to the end of the shaft 31 is actuated, the shaft 31 is connected to the pulley. It is designed to be engaged with and rotate as one unit.

Furthermore, regarding the aforementioned boo 17 PLB, in order to align the rotation direction with the other pulleys PLA and PLC, the gear G21
A shaft 32 is provided which is rotated in the opposite direction by meshing with G22, and a gear G23 is attached to the end of the shaft 32 protruding from the base plate 4.
is fixed, and a swinging member 33 as shown in FIGS. 3 and 4 is rotatably supported.

Regarding the pulleys PBA and PBC, the swinging member 33 is rotatably supported directly on the shaft end of the pongee 31.

Each of the swinging members 33 has a ring 34 having a predetermined outer circumferential dimension and a gear G24 which is integrated with a gear G25.
is pivoted and meshed with the gear G23, and is biased counterclockwise by a tension spring 35.

As a result, each of the swinging members 33 makes the outer periphery of the ring 34 come into contact with the outer periphery of the ring 27 provided at the tip of the stepped gear G1, and moves the gear G25 to each stepped gear G1.
The rotational power of the motor M is efficiently transmitted to the magnet roll 21A and the developing sleeve 23 by meshing them in a proper engagement state.

In this embodiment, the tooth $G25 is rotated clockwise! ! The structure is such that the direction of the reaction force received from the stepped gear G1 passes through the rotation center of the swinging member 33, that is, the right side of the pongee 31 or 32, so that the swinging member 33 In addition to the action of the tension spring 35, the m car G2 is also biased counterclockwise.
The fifth stepped gear G25 is more securely engaged with the stepped gear G1, and at the same time, each developing device is firmly pressed against the photosensitive drum 11Il.

On the other hand, the ohm W is meshed with a worm gear WG of a shaft 7) S installed outside the main plate 5, and the rotation of the motor M is also transmitted to the shaft 7) S. The pongee 41 which is pivotally attached to the shaft is driven via a pair of bevel gears BGI and BO2.

The pongee 41 has a fixed gear G41, and each gear G is rotatably supported by three shafts 42 which are connected in parallel.
42 directly or through intermediate teeth $043.

The bush 43 fixed to the pongee 42 and the teeth 42 rotate together due to the frictional force of the press-fitted coil spring 44, but the sleeve 45 engaged with the coil spring 44 is rotated when the sleeve 45 is engaged with the coil spring 44. When the driven rotation is stopped, the inner diameter of the coil spring 44 is expanded to release the compression of the teeth $G42, so that the rotation of each shaft 42 is stopped.

Furthermore, each of the shafts 42 has a gear G44 fixed to its end protruding from the base plate 4, and rotatably supports a swinging member 46 as shown in FIGS. 3 and 4.

Each of the swinging members 46 has a body portion 4 having a predetermined outer circumferential dimension.
The gears G45 having the gears G45 and G45 having the teeth 11
It is placed in a state in which it is engaged with the IG 44 and biased counterclockwise by a tension spring 48.

As a result, each of the swinging members 46 brings the outer periphery of the body 4 into contact with the outer periphery of the ring 28 that is integral with the teeth $G5, and brings the gear G45 into a proper engaged state with respect to each gear G5. The rotational power of the motor M is applied to the stirring shaft 2.
4, 25 and the scraped pongee 26 in an efficient manner.

In this embodiment, the rotation of the gear G45 is also driven clockwise, and the direction of the reaction force received from the gear G5 is directed toward the center of rotation of the swinging member 46, that is, the right side of the shaft 42. Since it is constructed so that it passes through, it effectively acts on the fixing of the gear and the pressure contact of the developing device, as in the case of the swinging member 33.

Thus, each of the developing devices fi2A, 2B and 2C includes a developing drive unit incorporated in each of the plates 4 and 5,
All of the operating elements are driven by the single developing motor M integrally attached to the unit, and at the same time, the above-mentioned developing stage is moved to the opposite side of the photoreceptor drum 1. By retracting each developing sleeve 23 from its circumferential surface, each of the aforementioned drive transmission systems is released, and each developing device can be taken out from the developing range.

That is, when the cam member 15 is turned counterclockwise by 90 degrees from the state shown in FIG. As shown in FIG. 4, the pressing pin 16 is stopped at a position where it comes into contact with the shaft portion of the cam member 15.

In the process of moving the developing range, each of the swinging members 33 and 46 comes into contact with a total of six control pins P implanted in the fixed substrate, so that each swinging member 33 and 46 resists the tension spring 35 or 48. and rotated clockwise by a predetermined angle.

As a result, the tooth *25 is retracted from the stepped gear G1, and the tooth Ill G45 is retracted from the tooth 11G5 to release the engagement therebetween, so that each of the developing devices 2A, 2B and V2C is operated as described above. It is separated from the drive transmission system and can be easily removed from the developing unit.

〔Effect of the invention〕

In the present invention, by providing one motor exclusively for development,
This is a developing device that is configured to drive all the operating elements of each developing device, including the formation and imaging device. It is an object of the present invention to provide a recording device that enables an iIJ system to be made into a compact unit and that can always exhibit stable development performance through constant rotational operation without being affected by load fluctuations on the main body of the device. became.

[Brief explanation of the drawing]

FIG. 1 is a side view of the configuration of the developing drive device of the present invention. FIG. 2, FIG. 3, and FIG. 4 are plan views of essential parts of the device. 1... Photosensitive drum 2A, 2B, 2C... Developing device 3... Storage side plate 4.5... Base plate 21.
... Magnet roll shaft 21A ... Magnet roll 22 ... Abutting roller 23 ... Developing sleeve 2
4.25... Stirring shaft 26... Scraping shaft 33
．． 48... Swinging member 35, 48... Tension spring P
...Control bins G1, G5...Developing device side gear M...Developing motor GL...Electromagnetic clutch SQL...Solenoid

Claims (2)

[Claims] (1) A developing drive device characterized in that a dedicated development motor is provided to drive each operating element in a plurality of developing devices, and only each operating element of each developing device is driven by the development dedicated motor. (2) The development drive device according to claim 1, wherein the development motor is integrally attached to a development drive unit that drives each of the operating elements.