JPS62209469A - Driving transmission mechanism for developing device in recording device - Google Patents

Abstract

PURPOSE:To transmit the driving force of a recording device when a developing device is loaded in a recording device by reducing the addenda of mutually engaging gears in chordal thickness by shifting, and allowing at least gear of a driving transmission system to rotate by a specific angle around the shaft on which the gear is provided. CONSTITUTION:A coupling gear 43 and a gear 44 for driving the developing device shift positively and are reduced in addendum chordal thickness (h), and a gear 45 for driving a developing sleeve and a gear 46 for driving an agitator roller 46 have center holes large enough to insert the shaft 52 of a developing sleeve or agitator roller, and a driving pin 55 fitted on the shaft 52 is positioned in a sectorial hole 54 which is symmetrically connecting with the center hole 53. Then the two gears 45 and 46 are rotatably around the shaft 52 by a specific angle, i.e. in a free state without rotating the shaft 52, so that the gear 44 for driving the developing device is also rotatable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a drive transmission mechanism for a developing device in a recording device, and in particular, to a developing device in a recording device that can ensure mutual meshing engagement of gears. This invention relates to the drive transmission mechanism of the device.

[Prior art and its problems]

Generally, among the developing devices used in recording devices, those that are removable from the recording device are:
When attached, the gears of the recording device and the gears of the developing device mesh and engage to transmit driving force to the developing device, but depending on the rotational position of the gears, the attachment of the developing device to the recording device There is a problem in that the tips of the teeth of the gears sometimes come into contact with each other, making it impossible to smoothly connect the drive transmission system, that is, to mount the developing device.

This invention solves the problems of the conventional ones as described above, and provides a developing device in a recording device in which the driving force of the recording device can be reliably transmitted to the developing device when the developing device is attached to the recording device. The purpose is to provide a drive transmission mechanism for the device.

[Means for solving problems]

In order to solve the above problems, the present invention has developed a system in which an electrostatic latent image on the circumferential surface of an image carrier is turned into a toner image using a developing device having a hopper at the top, and then transferred and fixed onto recording paper. In the recording apparatus, the drive transmission mechanism of the developing device has a gear that meshes with the gear of the recording device, and is of a coupling type in which drive is transmitted by both gears. The gears are shifted so that the thickness of the chord teeth at the tips of the teeth is reduced, and means that allows at least one gear in the drive transmission system to rotate by a predetermined angle with respect to the shaft on which it is installed. was adopted.

[Effect]

By employing the above means, the present invention ensures that the driving force of the recording device is transmitted when the developing device is attached to the recording device.

〔Example〕

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows an overall schematic diagram of an electrophotographic copying apparatus in which the device according to the present invention is installed, and a document glass table is provided on the upper surface of the main body 1 so as to be reciprocatable in the horizontal direction (in the left and right directions in the figure). 2 is provided, and its upper surface is opened/
A coverable platen cover 3 is provided.

A paper feed cassette 4 containing a bundle of sheets is arranged in a removable manner at the lower part of one side of the main body 1, and a paper discharge tray 5 is provided at the lower part of the other side.

On the other hand, a photoreceptor drum 6 serving as an image carrier is rotatably disposed in the center of the interior of the main body 1.
A convergent light transmitting body 7 is located above, and a charging device 8 is located on the front side of the convergent light transmitting body 7 in the rotational direction of the photosensitive drum 6. A developing device 9, a transfer pole 10, and a cleaning device 11 are arranged in this order on the front side.

An exposure lamp 12 for irradiating light onto the original glass table 2 is provided on the side of the convergent light transmitting body 7, and an exposure lamp 12 is provided above the convergent light transmitting body 7 and from the exposure lamp 12. A support roller 13 supporting the lower surface of the original glass table 2 is disposed at a position that does not obstruct the optical path leading to the convergent light transmitter 7.

A half-moon roller 14 is provided above the paper feed cassette 4 located at the bottom of one side of the main body l, and a paper feed cassette 4 is provided in front of the paper feed cassette 4 in the paper transport area.
An actuator 16 of a detection member 15 is provided to detect when the paper is ejected from the paper, and a pair of upper and lower paper refeed rollers 17a, 17 is provided in the transport area in front of the detection member 15 in the transport direction of the paper.
A locking member 18 that locks with the leading edge of the paper to stop conveyance of the paper is located in front of the paper refeed rollers 17a and 17b.

The lower surface of the conveyance path ahead of the paper refeed roller 17aS17b in the paper conveyance direction is formed by the upper surface of the toner collection box 19 located below the developing device 9, the photosensitive drum 6, and the cleaning device 11. At the same time, the transfer pole 10 is located within the recess 20 of the toner collection box 19.

A toner collection box 19 located below the developing device 9, the photosensitive drum 6, and the cleaning device 11 collects collected toner that falls from a drop opening located on the back side of the cleaning device 11 in FIG. The receiver has a collection port.

A fixing device 21 is provided adjacent to the toner collection box 19 on the opposite side of the paper feed cassette 4.

Note that 22 is a separation claw provided at the lower part of the cleaning device 11 and located in the conveyance path, 23 is a drive source, and 24 is an attachment for lifting the middle plate inside the paper feed cassette 4. A force member 25 is a hopper located above the developing device 9.

The electrophotographic copying apparatus configured as described above can lift the front side upward using the lower edge of the rear side as a fulcrum, and in the raised state, the toner collection box can be moved upward by the lower edge of the rear side. By pushing down the front side using the fulcrum as a fulcrum, the lower portions of the developing device, photosensitive drum, and cleaning device can be opened.

When operating the device configured as described above, first place the original on the top surface of the original glass table 2, cover it with the platen cover 3, perform operations on the operation panel, and then perform the copying operation. When the image of the original is irradiated by the exposure lamp 12, the original glass table 2 starts to move back and forth in the horizontal direction with the original covered by the platen cover 3 placed on its upper surface. 1
2 reaches the upper surface of the photoreceptor drum 6 via the convergent light transmitter 7, while the photoreceptor drum 6 is charged by the charging device 8 before reaching the lower side of the convergent light transmitter 7. is applied to the surface of the photoreceptor drum 6, so that the surface of the photoreceptor drum 6 has an electrostatic charge corresponding to the original image. Wt@ is formed.

Thereafter, as the photoreceptor drum 60 rotates, it is developed into a toner image by the developing device 9, while the uppermost sheet of paper in the paper feed cassette 4 is sequentially sent out by the half-moon roller 14 and passes through the actuator 16 of the detection member 15. Then, the sheet passes through a pair of upper and lower paper refeed rollers 17a and 17b, and is locked by a locking member 18 located within the conveyance path, and is temporarily on standby.

Thereafter, the paper is fed again at a predetermined timing, and the toner image on the surface of the photosensitive drum 60 is transferred to the four parts 2 of the toner collection box 19.
After being positioned on the upper surface of the paper by the action of the transfer pole 10 located within 0, the paper on which the toner image has been transferred is separated from the photosensitive drum 6 by a separation claw 22 and conveyed to the fixing device 21.

The fixing device 21 fixes the paper using pressure and heat, and the paper is discharged onto the upper surface of the paper discharge tray 5.

On the other hand, after the paper has been separated, the photosensitive drum 6 is cleaned by the cleaning device 11 in preparation for the next copying, and the toner scattered during cleaning by the cleaning device 11 is collected from the drop opening of the cleaning device 11. It falls into the collection box 19 and is stored there.

Regarding the relationship between the developing device 9 and the photoreceptor drum 6 of the electrophotographic copying apparatus configured as described above, first, the entire developing device 9 is in the form of a removable unit as shown in FIG. A predetermined gap a in the width direction in the space la of
It can be installed with a
As shown in the figure, a developing sleeve 32 is close to the photosensitive drum 6, and an agitation roller 31 and the developing sleeve 32 are installed between the casing 30 of the developing device 9, and the circumferential surface of the developing sleeve 32 is slightly spaced from the photosensitive drum 6.

The side surface of the developing device 9 is rotatable;
In addition, a locking member 33 having a hook portion 34 is provided, and a handle portion 35 can be extended in two stages, and the rear ends of both hook portions 34 are connected by a grip frame portion 36. Furthermore, a lever 37 for unlocking is provided at one end of the grip frame portion 36.

After positioning the developing device 9 in the space la of the main body l, the two-stage handle portion 35 is shortened and then rotated to the front side, that is, counterclockwise in FIGS. 2 and 3. The hook portion 34 of the locking member 33 is attached to a pin 38 provided on the main body 1 and protruding into the space la.
The developing device 9 is thereby engaged with the space la of the main body 1.
It is fixed inside.

After this, the developing cover 39 provided on the main body l is rotated to cover the upper surface of the developing device 9. On one side of the developing device 9, as shown in detail in FIG. It has a connector part 41 in which a connector terminal 40 is provided,
Further, since a connector terminal pin 42 is protruded from the portion of the developing cover 39 facing the connector terminal 40, the developing cover 39 can be rotated after the developing device 9 is positioned in the space la of the main body l. When the upper surface of the developing device 9 is covered, the connector terminal pin 42 is connected to the connector terminal 40 of the developing device 9.

Therefore, although it is necessary to supply power and the like to the developing device 9, power and the like can be supplied to the developing device 9 by simply rotating the developing cover 39.

The drive transmission system of the developing device 9 is as shown in FIGS. A driving gear 44 is provided at the bottom of the developing device 9,
This developing device driving gear 44 includes a developing sleeve driving gear 45 that drives the developing sleeve 32 and an agitation roller 3.
A stirring roller driving gear 46 that drives the hopper 25 meshes with the stirring roller driving gear 46, which is provided at the lower part of the hopper 25 through two idler gears 47 and 48, and supplies toner to the stirring roller driving gear 46. Toner supply roller 49 rotates to
A gear 51 rotatably provided on the shaft 50 meshes with the shaft 50 .

The compulsory gear 43 and the developing device driving gear 44 have a ten-point shift, and the thickness of the chord tooth at the tooth tip is small, as shown in FIG. 7, and the developing sleeve driving gear 45 and the stirring roller driving gear 46, as shown in FIG. The shaft 5 is inserted into the hole 54 of
2, and the two gears 45 and 46 can be rotated by a predetermined angle with respect to the shaft 52 without rotating the shaft 52, that is, in a free state, so that the developing The device drive gear 44 is also rotatable.

Therefore, when the developing device 9 is located in the empty space la of the main body 1, the developing device driving gear 44 is very easy to rotate relative to the compulsory gear 43, so that the coupling gear 43 and the developing device driving gear 44 are easily rotated. Coupled with the fact that the chord tooth thickness of the gear light with the drive gear 44 is small, the drive transmission system can be reliably connected by simply inserting the developing device 9 into the space la of the main body 1. .

Regarding the toner replenishment mechanism, a gear 51 is rotatably attached to the shaft 50 to which the toner replenishment roller 49 that rotates to supply the toner is connected, as described above. is integrally provided with a ratchet 56, and a lever 57 is provided at the end of the shaft 50 of the toner supply roller 49.
A ratchet pawl 58 that engages with the ratchet 56 of the gear 51 is pivotally attached to one end of the lever 57, and a spring 59 is stretched between the ratchet pawl 58 and the other end of the lever 57. 58 urges the ratchet 56 in the direction of engagement.

The ratchet pawl 58 is held apart from the ratchet 56 against the biasing force of the spring 59 by being engaged with an actuator 61 that is rotated by a solenoid 60.

Therefore, when the developing device 9 is installed in the space la of the main body 1, the developing device driving gear 44 meshes with the coupling gear 43, a drive transmission system is established, and the developing sleeve 32 And the stirring roller 31 rotates.

During the above-described operation, when the toner in the hopper 25 decreases, when replenishing the toner,
First, when the solenoid 60 is activated, the actuator 61 rotates due to the activation of the solenoid 60.
The engagement with the ratchet pawl 58 is released, and the ratchet pawl 58 engages with the ratchet 56 integrated with the gear 51 by the biasing force of the spring 59, thereby causing the gear 51,
The driving force of the coupling gear 43 is transmitted to the ratchet 56, the ratchet pawl 58, the lever 57, and the shaft 50 of the toner supply roller 49.
rotates, whereby the toner in the hopper 25 is supplied into the developing device 9.

When the toner in the hopper 25 runs out,
Take out the entire developing device 9 from the empty space 1a of the main body 1,
Toner is supplied into the hopper 25. At this time, first, the developing cover 39 is rotated upward to open the upper part of the developing device 9, and at the same time, the connector terminal pin is released from the connector terminal 40 of the connector portion 41. 42 will be removed.

After that, when the lock release lever 37 provided on the grip frame 36 between the rear ends of the handle 35 of the locking member 33 is pressed, the locking member 33 rotates and the hook portion 34 is attached to the main body 1. When the handle part 35 is released from the engagement with the pin 38 protruding from the pin 38 and the handle part 35 is pulled by the grip frame part 36, the developing device 9
The distance between the main body 1 of the electrophotographic copying machine and the developing device 9 can be widened, allowing the operator's hand to fit in easily.
can be taken out.

〔Effect of the invention〕

By configuring the invention as described in I, when the developing device is attached to the recording device, the gear of the recording device and the gear of the developing device reliably mesh with each other, so that the recording device can be attached to the developing device. This has excellent effects such as ensuring reliable transmission of driving force.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of an electrophotographic copying apparatus equipped with the one according to the present invention, FIG. 2 is a schematic perspective view showing the relationship between a recording device and a developing device, and FIG. 3 is a schematic vertical sectional view. 4
The figure shows the relationship between the connector part and the developing cover, Figure 5 is a schematic diagram showing the drive transmission system, Figure 6 shows the relationship between gears, and Figure 7 shows the coupling gear and developing device drive gear. FIG. 8 is a diagram showing the relationship between the developing sleeve driving gear and stirring roller driving gear, shafts and pins, and FIG. 9 is a schematic complete sectional view of what is shown in FIG. 5. ■ Main unit 2 Original glass stand 3 Platen cover 4 Paper cassette 5 Paper ejection tray 6 ... Photosensitive drum 7 ... Convergent light transmission body 8 ... Charging device 9 ... Development device V 10 ... Transfer pole 11.
...Cleaning device 12...Exposure lamp 13...Support roller 14...Half-moon roller 15...Detection member 16.61... ...actuators 17a, 17b
. . . Paper refeed roller 18.33 . . . Locking member 19 . . . Toner collection box 20 . . . Four parts 21 . . . Fixing device 22 ... Separation claw 23 ... Drive source 24 ... Urging member 25 ... Hopper 30 ... Casing 31 ... Stirring roller 32...Developing sleeve 34...Hook part 35...Grip part 36...Grip frame part 37...For unlocking Lever 38...
・Pin 39...Developing cover 40...Connector terminal 41...Connector part 42...Connector terminal pin 43...Coupling gear 44 ...Developing device drive gear 45...Developing sleeve drive gear 46...
...Agitation roller drive gear 47.48...Idler gear 49...Toner supply roller 50.52...Shaft 51...Gear 53... ... Central hole 54 ... Hole ' 55 ... Drive bottle 56 ... Ratchet 57 ... Lever 58 ... Ratchet pawl 59 ... ... Spring 60 ... Solenoid patent applicant Konishi Roku Photo Industry Co., Ltd. % formula % Figure 6 Figure 8 Procedural master's official document (Voluntary July 10, 1986 3, amended) Relationship with Hanyu Patent applicant address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo
No. Name (Name) (127) Konishiroku Photo Industry Tamashiki Company 4, Agent ■102 Place (! H262-47
61) Address: 3-8-13-7, Kudanminami, Chiyoda-ku, Tokyo. Details of amendment: The drawing (Figure 5) will be amended as attached. 8. Attached catalog drawings of class Σ (Fig. 5) ...... 1 copy or more of the procedural amendment (September 16, 1986)

Claims (1)

[Claims] In a recording device in which an electrostatic latent image on the circumferential surface of an image carrier is converted into a toner image by a developing device having a hopper at the top, and then transferred and fixed onto recording paper, a drive transmission mechanism of the developing device is provided. has a gear that meshes with the gear of the recording device, and is a coupling system in which drive is transmitted by both gears, and the gears that mesh and engage with each other are
It is characterized by being rearranged so that the thickness of the chord tooth at the tip of the tooth is reduced, and at least one gear in the drive transmission system is capable of rotating by a predetermined angle with respect to the shaft on which it is installed. A drive transmission mechanism for a developing device in a recording device.