JPS62127759A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify the electric circuit of an image forming device and to improve the equipping property of the device, by fixing a transmitting means which transmits the driving force of a motor to a photosensitive drum, etc., to a freely attachable and detachable frame and, at the same time, providing the electric circuit for controlling the drive, etc., of the motor to the frame. CONSTITUTION:A main motor 81, 1st-3rd driven timing pulleys 87-89, and timing belt 86 are fitted to the front side of a subframe 130 and a motor 123 for exposure scan is fitted to the rear side of the subframe 130. Moreover, an electric circuit 143 is also fitted to the rear side of the subframe 130. Since the motor 81 and electric circuit 143 are fitted to the same frame, namely, subframe 130, the electric circuit 143 can be simplified and, at the same time, the equipping property can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image forming apparatus such as a copying machine.

[Conventional technology]

2. Description of the Related Art Conventionally, image forming apparatuses configured as shown in FIGS. 10 to 12 are known.

That is, 1 in FIG. 10 is a main body, and the upper part of this main body 1 is provided with a document table 2, and approximately in the center of the main body 1 is a photoreceptor that rotates in a predetermined direction with the image forming process. A drum 3 is pivotally supported. Further, an exposure device 4 is provided between the photoconductor drum 3 and the document table 2, which scans the document placed on the document table 2 with a lamp 5, and directs the reflected light to a moving mirror. 6. 7, 8, guided onto the photosensitive drum 3 via the fixed mirror 9 and lens 10,
It is designed to form an image of the original. Further, in order from the image forming position along the rotational direction of the photosensitive drum 3, a developing device 11, a transfer charger 12, a peeling charger 13, a cleaner 14, a static elimination lamp 15, and a charging charge t1 are installed.
6 is placed.

In addition, a paper feed cassette 17.1 is provided at the lower side of the main body 1.
8 are provided, and the paper p is independently fed from these paper feed cassettes 17 and 18 by paper feed rollers 19 and 20.
registration rollers 21, 21, a transfer section between the photosensitive drum 3 and the transfer charger 12 and the peeling charger 13;
Conveyor belt 23, fixing device 24, and paper ejection roller 25.
25, and are ejected onto a paper ejection tray 26. Note that 27 is a cooling fan.

In addition, the rear frame of the main body 1 is shown in Fig. 11 and Fig. 1.
As shown in FIG. 2, a photoconductor drum drive motor 28, a developing device drive motor 29, an exposure scanning motor 30, a fixing device drive motor 31, a paper feed roller drive motor 32, and a registration rotor drive motor 33 is installed, and further behind it, driver PC boards 34, 35, logic P
A C plate 36 is attached. And each motor 28~
33 is a driver PC board 34, 35, logic PC board 36
are electrically connected to each other via connectors 37 and harnesses 38.

[Problem that the invention seeks to solve]

In the conventional device described above, the PC boards 34 to 36 are each independently attached to the rear frame and electrically connected via the connectors 37... and the harnesses 38..., which is complicated and requires maintenance. Poor fit. Further, there is a problem in that the motors 28-33 cannot be inspected unless the connectors 37 are removed and the PC boards 34-36 are removed.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide an image forming apparatus that simplifies the electrical circuit, improves repairability, and allows easy inspection of the motor. Our goal is to provide the following.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention fixes a motor for driving a photoreceptor drum, etc., and a transmission means for transmitting the driving force of the motor to the photoreceptor drum, etc., to a removable frame. The present invention is characterized in that an electric circuit for controlling the driving of the motor and the like is disposed on the frame.

[Effect]

Since the motor and the electric circuit are attached to the same frame, the PC board, connector, harness, etc. that make up the electric circuit are integrated into one.

Further, since the motor, the transmission means, and the electric circuit are attached to the same frame, the motor, the transmission means, and the electric circuit can be removed together by simply removing the frame.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 9.

FIG. 5 shows a two-color copying machine as an image forming apparatus according to the present invention, and numeral 41 in this figure is the main body of the copying machine. A document table 42 on which a document is placed is fixed to the upper surface of the main body 41. Further, an exposure device 51 including a lamp 43, four mirrors 44, a lens 50, etc. is provided below the document table 42. The original set on the original table 42 is exposed and scanned by the exposure lamp 43 and mirrors 44 to 46 reciprocating along the lower surface of the original table 2. . In this case, the mirrors 45 and 46 move at half the speed of the mirror 44 so as to keep the optical path length constant.

The light reflected from the document due to the above scanning, that is, the lamp 43
Due to the light irradiation, the reflected light from the manuscript is reflected from the mirror 44 to
46, passes through the copying magnification setting lens 50, is roughly reflected by mirrors 47 to 4, and is guided to the photoreceptor drum 53 via the slit 52, so that the image of the original is placed on the surface of the photoreceptor drum 53. It is designed to be imaged. The photosensitive drum 53 rotates in a predetermined direction, and the surface is first charged by the charger 54, and then the image of the document is exposed to slit light to form an electrostatic latent image. Alternatively, it is configured to be visualized by toner being applied by the second developing device 55 or 56.

On the other hand, the paper p is in the upper or lower paper feed cassette 57.5.
8 are taken out one by one by paper feed rollers 59 and 60,
Conveying rollers 61, 61, 62°62 and guides 63.
63 to a pair of registration rollers 64, 64, and are aligned by the registration rollers 64, 64 and sent to an image transfer section. The paper p sent to the image transfer section comes into close contact with the surface of the photoreceptor drum 53 by the transfer charger 65, and the toner image on the photoreceptor drum 53 is transferred by the action of the transfer charger 65. The paper to which this toner image has been transferred is electrostatically peeled off from the photoreceptor drum 53 by the action of a peeling charger 66, and then conveyed by a conveyor belt 68 stretched between rollers 67 and 67. The transferred image is sent to a fixing device 71 consisting of a heat roller 69 and a press roller 70 that are provided opposite to each other, and the transferred image is fixed by passing therethrough. After fixing, the sheet Np is discharged onto a tray 73 outside the main body 41 by paper discharge rollers 72,72. Further, the photosensitive drum 53 after the transfer is configured such that after the residual toner on the surface is removed by a cleaner 74, the residual image is erased by a static elimination lamp 75 and the photosensitive drum 53 returns to its initial state.

The exposure device 51 has a variable magnification function, and the lens 50 and mirrors 47, 48 are displaced by a motor 76 according to the amount of variable magnification.

The first and second developing devices 55 and 56 have developing rollers 77 and 78, respectively, and the first developing device 55 disposed on the upper side carries, for example, black toner. For example, red toner is stored in the second developing devices 56 disposed in the respective second developing devices 56 . In addition, these developing devices 55.
56 can be independently moved toward and away from the photoreceptor drum 53, and one of them is brought close to the photoreceptor drum 53 to develop the electrostatic latent image on the photoreceptor drum 53. .

The cleaner 74 scrapes off toner from the surface of the photoreceptor drum 53 with a blade 79, and collects this toner with a collection roller 80.

Further, between the fixing device 71 and the exposure device 51 in the main body 41, as shown in FIGS. A main fan 83 that operates during formation and mainly discharges heat from the exposure device 51, and a sub fan 84 that operates at all times when the main power of the device is on and discharges heat from the fixing device 71 are provided. ing.

Further, as shown in FIG. 8, a driving timing pulley 85 is attached to a portion of the rotating shaft 82 of the main motor 81 that protrudes to the rear side. A timing belt 86, which is a toothed belt, is wrapped around it. The timing belt 86 is also wrapped around the first to fourth driven timing pulleys 87 to 90.

The first driven timing pulley 87 is arranged outside the timing belt 86, and a gear 91 is fixed to the first driven timing pulley 87. A gear 92 meshes with this gear 91, and a timing pulley 93 is fixed to this gear 92. A timing belt 95 is stretched between the timing pulley 93 and a timing pulley 94 fixed to the photoreceptor drum 53, so that the photoreceptor drum 53 is driven. A gear 96 is fixed to the timing pulley 94, and the driving force from the gear 96 is transmitted to the collection roller 80 of the cleaner 74 through gears 97 and 98 in sequence.
A collection roller 80 is driven.

The second driven timing pulley 88 is arranged inside the timing belt 86, and a gear 99 is fixed to the second timing pulley 88. When the second developing device 56 approaches the photosensitive drum 53, the gear 100 fixed to the developing roller 78 meshes with the gear 99, and the developing roller 78 is driven. A gear 101 meshes with the gear 99, and when the first developing device 55 approaches the photosensitive drum 53, the gear 102 fixed to the developing roller 77 engages the gear 138 fixed to the gear 101. They mesh, and the developing roller 77 is driven.

The third driven timing pulley 8 is arranged inside the timing belt 86 because it adjusts the tension of the timing belt 86.

The fourth driven timing pulley 90 is arranged outside the timing belt 86, and a gear 103 is fixed to the fourth timing pulley 90. This gear 10
Gear 104 meshes with gear 3, and gear 1 meshes with this gear 104.
05 is fixed.

A gear 106 fixed to one of the rollers 67 meshes with this gear 105, thereby driving a conveyor belt 68. Furthermore, the driving force from the gear 105 is transmitted via a gear 107 to a gear 108 fixed to the heat roller 69, thereby driving the heat roller 69. Also, gear 10
8 meshes with a gear 109 fixed to the press roller 70, so that the press roller 70 is driven together with the six heat rollers. Furthermore, gear 10
The driving force from 8 is sequentially transmitted via gears 110 and 111 to gears 112 and 112 fixed to the paper discharge rollers 72 and 72, thereby driving the paper discharge rollers 72 and 72.

Note that 114 is a paper feeding motor, and this motor 114
A gear 116 is fixed to a rotating shaft 115 of the rotary shaft 115 . The driving force from the gear 116 is then applied to the gear 117, the timing pulley 118, and the timing belt 11.
The above conveyance rollers 61.61, 62.6 via 9...
2, and is further transmitted to paper feed rollers 59, 60 via belts 120, . . . and pulleys 121, . Further, the driving force from the gear 116 is transmitted to the registration rows 564, 64 via the gear 122.

In addition, 123 is an exposure scanning motor, and this motor]
23 drives an exposure lamp 43 and mirrors 44 to 46 via timing pulleys 124 . . . and a timing belt 125.

The main body 41 also includes the upper unit 1 with the paper conveyance path as its boundary.
26 and a lower unit 127 (see also FIG. 4), and the paper ejection side of the upper unit 126 opens upward around the support shaft 128 on the paper feed side, as shown by the imaginary line in the figure. ing.

Further, the upper unit 126 can be held in a closed state or an open state by a support mechanism 129.

Further, as shown in FIG. 9, the main motor 81, the first to third driven timing pulleys 87 to 89, and the timing belt 86 are located on the front side of the subframe 130, and the exposure scanning motor 123 is located on the front side of the subframe 130. 130
are installed on the rear side of each.

Further, as shown in FIGS. 1 and 2, a driver PC board 1 for driving the motor is provided on the rear side of the subframe 130.
31. Logic PC board 132 for motor control.
PC board 133 for high voltage transformer for charger, connector 141 and harness 14 for electrically connecting these
An electric circuit 143 consisting of 2 etc. is attached.

As shown in FIGS. 2 and 3, this subframe 130 is attached to the rear side of the main body 41, and in this state, gears 91 and 92, gears 99 and 101, and gears 90 and 105 are connected, respectively. The rotating shaft 82 of the main motor 81 and the main fan 83 are connected to each other.

Furthermore, as shown in FIG.
are attached to the rear frame 134 of the upper unit 126, and the fourth driven timing pulley 90 is attached to the rear frame 135 of the lower unit 127, respectively. As a result, when the upper unit 126 is opened,
The first to third driven timing pulleys 87 to 89 and the fourth
The timing belt 86 is separated from the driven timing pulley 9o, and the timing belt 86 is loosened.

According to the above configuration, the motor 81 and the electric circuit 143
are attached to the same frame, that is, the subframe 130, so that the driver P constituting the electric circuit 143
C board 131, logic PC board 132, P for high voltage transformer
The C plate 133, the connector 141, the harness 142, etc. are integrated into one. Therefore, the electric circuit 143 can be simplified and repairability can be improved.

In addition, a motor 81, a timing belt 86, an electric circuit 1
43 is attached to the subframe 130, the motor 81, timing belt 86, and electric circuit 143 can be removed together by simply removing the subframe 130. Therefore, these inspections, adjustments, etc. can be easily performed.

In general, by applying conductive treatment to the rear cover of the main body, it is possible to completely prevent static electricity noise, radioactive radio noise, etc. between the rear cover and the subframe.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a motor that drives a photoreceptor drum, etc., a transmission means that transmits the driving force of the motor to the photoreceptor drum, etc., and a removable motor that fixes the transmission means and the motor. Moreover, since the frame is equipped with an electric circuit for controlling the drive of the motor, etc., the electric circuit can be simplified and the installation performance can be improved, and the motor can be inspected easily. It is easy to perform and has excellent effects.

[Brief explanation of drawings]

Figures 1 to 9 show one embodiment of the present invention.
The figure is an exploded perspective view showing the relationship between the motor, timing belt, driver PC board, logic PC board, etc. and the subframe, Figure 2 is an exploded perspective view showing the relationship between the subframe and the main body, and Figure 3 is the subframe. Figure 4 is a perspective view showing the frame attached to the main body, Figure 4 is a cross-sectional view showing the sub-frame attached to the body, Figure 5 is a vertical front view schematically showing the internal structure, and Figure 6 is the fan section. 7th longitudinal plan view showing
8 is a diagram schematically showing the driving force transmission system, FIG. 9 is an exploded perspective view showing the relationship between the main motor, timing belt, etc. and the subframe, and FIG. Figures to Figure 12 show conventional examples.
FIG. 10 is a vertical sectional front view showing the internal structure, FIG. 111 is a perspective view showing how the drive motor is installed, and FIG. 12 is a perspective view showing how the drive motor and PC board are installed. 53... Photosensitive drum, 81... Main motor, 8
6...timing belt (transmission means), 130...
Subframe, 143...electric circuit. Applicant's Representative Patent Attorney Takeshi Suzue Industry 1 Figure 3 Figure 4 Figure 7 Figure 9

Claims (1)

[Claims] A motor for driving a photoreceptor drum, etc., a transmission means for transmitting the driving force of the motor to the photoreceptor drum, etc., and a removable frame for fixing the transmission means and the motor. An image forming apparatus characterized in that an electric circuit for controlling driving of the motor, etc. is arranged in the image forming apparatus.