JPS62127731A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate the necessity of a motor which is exclusively used for driving an optical system cooling fan from an image forming device, by coupling the optical system cooling fan with a motor for driving a photosensitive drum. CONSTITUTION:A motor 81 which drives a photosensitive drum, etc., directly drives an optical system cooling fan 83. Namely, the main fan 83 which is directly coupled with the part of the shaft 82 of the main motor 81 projected to the front side and operated at the time of image formation for cooling the optical system of an exposure device 51 and a sub-fan 84 which is always operated when the main power supply to this device is made and mainly used for cooling a fixing device 71 are provided. Moreover, a timing pulley 85 for driving is fitted to the shaft 82 of the main motor 81 and a timing belt 86 is put around the pulley 85. The belt 86 is also put around the 1st-4th driven timing pulleys 87-90.

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 photosensitive drum that rotates in a predetermined direction with the image forming process. 3 is pivoted. 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 the 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 17 are installed.
16 are arranged.

Further, in the lower side part of the main body 1, a paper feed force cell 1-17.
18 are provided, and the paper p, which is independently fed from these paper feed cassettes 17 and 18 by paper feed rollers 19 and 20, is transferred to the lenses 1 to 521, 21, the photosensitive drum 3, the transfer charger 12, and the peeling charger. 13, a transfer unit between the transfer belt 23, a fixing device 24, and a paper ejection roller 2.
5 and 25, and is discharged onto a paper discharge tray 26.

Also, between the exposure device 4 and the fixing device 24 in the main body 1, there are mainly a lamp 5, a mirror 6, 7, 8, etc. of an exposure bag '114.
A fan 27 is provided for cooling the optical system such as the optical system 9 and the lens 10 .

Further, on the rear side of the main body 1, as shown in FIGS. 11 and 12, a photosensitive drum driving motor 28, a developing device driving motor 29, an exposure scanning motor 30, a fixing device driving motor 31, Paper feed roller drive motor 32, registration roller drive motor 33, and fan drive motor 3
4 is attached, and further behind it is the driver PC board 3.
5°36, the logic PC board 37 is attached.

Each motor 28 to 34 is connected to a driver PC board 35.3.
6. Electrically connected via logic PC board 37 and connector 38 .

[Problem that the invention seeks to solve]

In the above-mentioned conventional apparatus, the lamp 5, mirror 6.
Since the optical system such as 7.8.9 and lens 10 is made of glass that is difficult to cool, the fan drive motor 3
4 uses a dedicated motor with a large cooling capacity I.

Therefore, the motor 34 is expensive and heavy.

The present invention has been made based on the above circumstances, and its purpose is to omit the dedicated motor that drives the fan for cooling the optical system, thereby reducing cost and weight. An object of the present invention is to provide an image forming apparatus capable of achieving the following objectives.

[Means for solving problems]

In order to solve the above problems, the present invention provides an image forming apparatus in which an image of a document is formed on a photoreceptor drum by an optical system. It is characterized by a connected fan.

[Effect]

Since the motor that drives the photoreceptor drum etc. has power,
This motor directly drives at least a fan that cools the optical system.

[Embodiments of the invention]

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

FIG. 7 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 having an optical system including a lamp 43, mirrors 44 to 49, and a lens 5o 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, mirrors 45 and 46 move at half the speed of mirror 44 so as to keep the optical path length constant. The light reflected from the original by the scanning, that is, the light reflected from the original by the light irradiation of the lamp 43 is reflected by the mirrors 44 to 46, passes through the copy magnification setting lens 50, and is further reflected by the mirrors 47 to 49. , and is guided to a photosensitive drum 53 through a slit 52, so that an image of the document is formed on the surface of the photosensitive drum 53. 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. Or can the toner be deposited by the second developer 55, 56? J! It is configured to be visualized.

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,
Conveyance roller 61.61.62°62 and guide 63.
63 to a pair of registration rollers 64, 64, and is configured to be 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 six heat rollers and a press roller 70 installed opposite to each other, and the transferred image is fixed by passing therethrough.

After fixing, the paper p is discharged onto a tray 73 outside the main body 41 by a paper discharge roller 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 the motor 76 in accordance with the amount of change I8.

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 static N latent 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.

Furthermore, 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 cools the optical system of the exposure device 51, and a sub fan 84 that operates all the time when the main power of the device is on and mainly cools the fixing device 71 are provided. It is being

Further, as shown in FIG. 1, 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 bell 86 is also hung around the first to fourth driven timing pulleys 87 to 9o.

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 recovery row 580 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 89 is for adjusting the tension of the timing belt 86, and is arranged inside 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. Further, the driving force from the gear 105 is transmitted via the gear 107 to the gear '108 fixed to the P1 to roller 69, thereby driving the heat roller 69. Further, a gear 109 fixed to the press roller 70 meshes with the gear 108, so that the press roller 70 is connected to the heat roller 6.
It is designed to be driven together with 9. Furthermore, the driving force from the gear 108 is transmitted through gears 110 and 111 in sequence to the gears 112 and 112 fixed to the paper ejection rollers 72 and 72.
The output is transmitted to the output rollers 72 and 72, thereby driving the 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 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 rollers 64, 64 via the gear 122.

Further, 123 is an exposure scanning motor, and this motor 1
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. 6), 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. 2, 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 FIG. 3, on the rear side of the subframe 130, a motor drive driver PCffi 131. A logic PC board 132 for motor control and a PC board 133 for high voltage transformer for charger are attached.

As shown in FIGS. 4 and 5, 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.

Roughly, 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 90, and the timing belt 86 is loosened.

According to the above configuration, since the main fan 83 is directly driven by the main motor 81, a dedicated motor for driving the main fan 83 can be omitted. Therefore, the cost and weight of the motor can be reduced by the amount of the motor.

In this case, since the main motor 83 has power, a fan with high cooling efficiency can be used as the main fan 83.

(Effects of the Invention) As described above, according to the present invention, in an image forming apparatus in which an image of a document is formed on a photoreceptor drum by an optical system, the motor for driving the photoreceptor drum and the optical Since the optical system is equipped with a fan for cooling the optical system, and this fan is connected to the motor, a dedicated motor for driving the fan for cooling the optical system can be omitted.
It has excellent effects such as being able to reduce costs and weight.

[Brief explanation of drawings]

Figures 1 to 9 show one embodiment of the present invention.
The figure schematically shows the driving force transmission system, Figure 2 is an exploded perspective view showing the relationship between the main motor, timing belt, etc. and the subframe, and Figure 3 shows the relationship between the driver PC board, logic PC board, and subframe. An exploded perspective view showing the relationship between
Fig. 4 is an exploded perspective view showing the relationship between the subframe and the main body, Fig. 5 is a perspective view showing the subframe attached to the main body, and Fig. 6 is a sectional view showing the subframe attached to the main body. , Fig. 7 is a longitudinal sectional front view schematically showing the internal structure, Fig. 8 is a longitudinal sectional plan view showing the fan section, Fig. 9 is a longitudinal sectional front view also showing the fan section, and Figs. 10 to 12 are conventional Figure 10 is a longitudinal sectional front view showing the internal structure, Figure 11 is a perspective view showing how the drive motor is installed, and Figure 12 is a perspective view showing how the drive motor and PC board are installed. It is. 43...Lamp, 44-49...Mirror, 5o...
- Lens, 53... Photosensitive drum, 55... First developing device, 56... Second developing device, 71... Fixing device,
81... Main motor, 83... Main fan. Applicant's Representative Patent Attorney Takehiko Suzue Figure 5 South Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] An image of a document is formed on a photoreceptor drum by an optical system, comprising a motor for driving the photoreceptor drum and a fan for cooling the optical system, the fan being connected to the motor. An image forming apparatus characterized by: