JPH1026853A - Image forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry jammed transfer paper without operating respective carrying rollers by connecting plural carrying rollers transmissibly in the open state of the front cover of a machine housing, and rotating a rotary knob attached to the transmissibly connected carrying rollers. SOLUTION: In the case of jamming, by opening a front cover, a support plate 51 is rotated around a short shaft 52a by means of a tensile coil spring 54. Consequently, a gear 53c attached to the support plate 51 meshes with a gear 350a attached to the rotary shaft 351 of a drive roller 35a composing the pair of carrying rollers, and the rotary shaft 36a of a drive roller composing a pair of resist rollers and the rotary shaft 351 of the drive roller 35a are connected transmissibly. Thus, by gripping the rotary knob attached to the rotary shaft 361 of the drive roller composing the pair of resist rollers and by turning the drive roller composing the pair of resist rollers, the drive roller 35a composing the pair of carrying rollers can be rotated in the same direction via the gear mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming machine such as an electrostatic copying machine or a laser printer, and more particularly, to an image forming machine capable of facilitating jam processing.

[0002]

2. Description of the Related Art Generally, an image forming apparatus includes an image carrier having a photosensitive layer, an electrostatic latent image forming means for forming an electrostatic latent image on a photosensitive member of the image carrier, and an electrostatic latent image forming means. A developing device that develops the electrostatic latent image formed on the photoconductor into a toner image by
An image forming unit including a transfer unit for transferring the toner image on the photoconductor developed by the developing device to a transfer sheet in a transfer area; and transferring the transfer sheet to the transfer area of the image forming unit. Paper feeding means.

In the image forming apparatus described above, a paper jam (jam) may occur in the paper feeding means, and it is preferable that the transfer paper having the jammed paper be easily removed. As this jam clearing method, a rotary knob is attached to each end of a plurality of transport rollers constituting the paper feeding unit,
A method has been put into practical use in which each transfer knob is gripped and each roller is manually turned to remove the jammed transfer sheet by moving forward or backward during jam processing.

[0004]

However, in the above-described jam clearing method, each transport roller holding the jammed transfer paper must be operated and rotated. Further, when the transfer paper is sandwiched between two transfer rollers, the transfer paper is pulled and torn unless the two transfer rollers are simultaneously rotated at the same speed, so that the rear transfer roller is first rotated. Then, after the transfer paper is conveyed to the front conveyance roller, the front conveyance roller is rotated to perform the operation of sending the transfer paper, and the jam processing is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a main technical problem thereof is to provide an image forming apparatus capable of feeding a jammed transfer sheet without operating a transport roller. is there.

[0006]

According to the present invention, there is provided, in accordance with the present invention, a fuselage housing having a front cover openably and closably mounted on a front surface thereof, and disposed within the fuselage housing. An image forming apparatus, comprising: an image forming unit, and a sheet feeding unit having a plurality of independently driven conveying rollers for conveying a transfer sheet to a transfer area of the image forming unit. A rotating mechanism for transmitting and connecting at least two transport rollers of the plurality of transport rollers to each other in an open state, and a power transmission by the rotating mechanism which operates in conjunction with opening and closing of the front cover and closes the front cover. An image forming apparatus comprising: a transmission releasing means for releasing the connection; and a rotation knob mounted on at least one of at least two transport rollers which are transmitted and connected to each other by the rotation mechanism. There is provided.

According to the present invention, the turning mechanism is constituted by a gear mechanism disposed on a gear mounting plate, and the transmission canceling means is mounted on the front cover to operate the gear mounting plate. There is provided an image forming machine including a member, wherein the actuating member activates the gear mounting plate when the front cover is closed to release the transmission connection by the gear mechanism.

Further, according to the present invention, the rotation mechanism is constituted by a gear mechanism, and the transmission canceling means is mounted with one gear constituting the gear mechanism and is supported so as to be operable in the axial direction. There is provided an image forming machine comprising an operation support shaft, wherein when the front cover is closed, the operation support shaft is operated in the axial direction to release the transmission meshing of the gear mechanism.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of an image forming apparatus constructed according to the present invention will be described below in detail with reference to the accompanying drawings.

The electrostatic copying machine as an image forming machine shown in FIG. 1 includes a box-shaped body housing indicated by reference numeral 2 as a whole. The body housing 2 includes a front cover 3 mounted on the front surface of the housing so as to be openable and closable with the lower end as a fulcrum. As shown in FIG. 2, a transparent plate 4 on which a document to be copied is placed is provided on the upper surface of the housing 2, and a transparent plate 4 and a document for covering the document placed thereon are provided. A document cover 5 is provided so as to be openable and closable.

At a substantially central portion of the housing 2, a photosensitive drum (rotary drum) 6 as an image carrier having an appropriate photosensitive layer disposed on the peripheral surface as shown in FIG. 2 is provided. . The photoreceptor drum 6 is rotatably supported by front and rear side plates constituting the housing 2 via shafts provided at both ends thereof. The photosensitive drum 6
It is designed to be driven to rotate in a direction indicated by an arrow 8 by driving means (not shown). Around the photoreceptor drum 6 which is driven to rotate in the direction indicated by the arrow 8, development is sequentially performed by the charging corona discharger 10, the developing device 12, and the developing device 12 as charging means when viewed in the direction of rotation. Transfer corona discharger 14 constituting transfer means for transferring the toner image on the photoreceptor to transfer paper in a transfer area, and is disposed downstream of the transfer means 14 and adheres to a photoreceptor drum (rotary drum) 6. Corona discharger 16 for peeling constituting a peeling means for peeling transfer paper, and cleaning device 18
Are arranged. An exposing unit 20 for irradiating the original placed on the transparent plate 6 and exposing the reflected light to the photosensitive layer of the photosensitive drum 6 is provided at an upper portion of the housing 2. The photosensitive drum (rotary drum) and the devices disposed around the photosensitive drum (rotary drum) constitute an image forming unit of the electrostatic copying machine.

The housing 2 is provided with paper feed means 30 for supplying transfer paper to the transfer area 22 of the image forming means. The paper feeding means 30 includes a transfer paper cassette 31 for storing the transfer paper, a feed roller 32 disposed above the right end of the transfer paper cassette 31 in FIG. 2, and a downstream side of the feed roller 32. A pair of separating rollers 33, a pair of conveying rollers 34 and 35 disposed downstream of the pair of separating rollers 33, and a pair of registration rollers 36 disposed downstream of the pair of conveying rollers 35. ing. The feed roller 32 is driven to rotate in a direction indicated by an arrow by a driving unit (not shown), and feeds out the transfer sheets stored in the transfer sheet cassette 31 one by one. Handling roller pair 33
Is composed of an upper roller 33a and a lower roller 33b, and is driven to rotate in directions indicated by arrows by driving means (not shown). The transport roller pairs 34 and 35 are composed of driving rollers 34a and 35a and driven rollers 34b and 35b, respectively. The driving rollers 34a and 35a are respectively driven to rotate in the directions indicated by arrows by driving means (not shown). The registration roller pair 36 also includes a driving roller 36a and a driven roller 36b.
The driving roller 36a is rotationally driven in a direction indicated by an arrow by driving means (not shown).
The driving roller 36a forming the registration roller pair 36 and the driving rollers 34a and 35a forming the transport roller pairs 34 and 35 are configured to be driven to rotate independently of each other. Guide plates 37a, 37b and 38a are provided between the separating roller pair 33 and the transport roller pair 34, between the transport roller pair 34 and the transport roller pair 35, and between the transport roller pair 35 and the registration roller pair 36, respectively. And 38b, 39a and 39b are provided. The registration roller pair 36 and the transfer area 2
Guide plates 40a and 40b are also arranged between them. These guide plates form a transfer sheet supply path.

In the illustrated embodiment, a rotation shaft 36 of a driving roller 36a constituting the registration roller pair 36 is used.
1 has a gear 360 at its front end (the right end in FIG. 5).
Further, a gear 350a is mounted on a front end (right end in FIG. 5) of the rotation shaft 351 of the drive roller 35a constituting the transport roller pair 35. A turning mechanism 50 is provided for selectively transmitting and connecting the gears 360a and 350a. The rotation mechanism 50
A gear mounting plate 51 for mounting a gear mechanism is provided. The gear mounting plate 51 is made of a metal plate, and three short shafts 52a, 52b, 52c are attached to the gear mounting plate 51. These short axes 52a, 52b, 52c
, Gears 53a, 53b, 53c are rotatably mounted respectively. The short shaft 52a is attached to a fixed plate 211 provided on the body housing 2, and the gear mounting plate 51 is configured to be swingable about the short shaft 52a. The gear 53a and the gear 53b and the gear 53b and the gear 53c mesh with each other. As described above, the gear 53a constituting the gear mechanism disposed on the gear mounting plate 51 is provided with the driving roller 36a constituting the registration roller pair 36.
The gear 53c is configured to mesh with a gear 360a mounted on the rotating shaft 361 of the transfer roller pair 3
5 is configured to be selectively engaged with a gear 350a mounted on a rotation shaft 351 of a drive roller 35a constituting the fifth roller 5. Therefore, when the gear 53c and the gear 350a are engaged with each other, the rotation shaft 361 of the drive roller 36a forming the registration roller pair 36 and the rotation shaft 351 of the drive roller 35a forming the transport roller pair 35 are transmission-coupled. State. A rotation knob 362 is attached to the end of the rotation shaft 361 of the driving roller 36a constituting the registration roller pair 36. Therefore, the rotation knob 362 is gripped to form the registration roller pair 36. By rotating the driving roller 36a, the driving roller 35a constituting the transport roller pair 35 can be rotated in the same direction via each gear. In the illustrated embodiment, the rotation knob 362 is mounted on the rotation shaft 361 of the drive roller 36a constituting the registration roller pair 36. However, the rotation knob 362 is connected to the conveyance roller pair 3
5 may be mounted on the rotating shaft 351 of the driving roller 35a, or may be mounted on both rotating shafts. The gear mounting plate 51 is fixed to the short axis 52a by a tension coil spring 54 disposed between the gear mounting plate 51 and a fixed portion such as the fixed plate 211.
2 is urged to rotate counterclockwise in FIG.

In the illustrated embodiment, the driving roller 36a forming the registration roller pair 36 and the driving roller 3 forming the transport roller pair 35 by the rotating mechanism 50 are used.
A transmission canceling means 60 for canceling the transmission connection with 5a is provided. As shown in FIG. 6, the transmission canceling means 60 includes an actuated piece 61 provided on the gear mounting plate 51 and an operating member 62 mounted on the front cover 3. In the driven piece 61, the lower end of the gear mounting plate 51 is on the front side,
That is, it is formed by being bent toward the front cover 3 side. The operating member 62 is mounted on the back surface of the front cover 3, and a tip end portion thereof is formed with an inclined operating surface 620 that engages with the operated piece 61. This operating member 62
In the state where the front cover 3 is closed, the gear mounting plate 51 is rotated clockwise about the short axis 52a against the force of the tension coil spring 54 by engaging with the operated piece 61 with the front cover 3 closed. Is configured. Accordingly, when the front cover 3 is open, the support plate 51 is urged by the tension coil spring 54 to rotate counterclockwise around the short axis 52a, and thus the support plate 51 is mounted on the gear mounting plate 51. The drive roller 3 in which the gear 53c constitutes the transport roller pair 35
5a, the rotating shaft 361 of the driving roller 36a forming the pair of registration rollers 36 and the rotating shaft 351 of the driving roller 35a forming the conveying roller pair 35 are rotated. And transmission connection. On the other hand, when the front cover 3 is closed, the operating member 62 engages with the operated piece 61 to move the gear mounting plate 51 against the force of the tension coil spring 54 about the short axis 52a. , The gear 53c and the gear 350a are disengaged from each other, and the rotation shaft 361 of the drive roller 36a forming the registration roller pair 36 and the drive roller 35a forming the transport roller pair 35 are rotated. The transmission connection with the rotating shaft 351 is released.

Next, another embodiment of the turning mechanism and the transmission canceling means will be described with reference to FIG. The rotating mechanism 500 in this embodiment includes two support shafts 520a and 520c attached to a fixed plate 211 provided on the body housing 2.
A gear mounting plate 510 is mounted on the distal ends of 20a and 520c. The support shaft 520a is rotatably mounted with a gear 530a that meshes with a gear 360a mounted on the rotation shaft 361 of the drive roller 36a that constitutes the registration roller pair 36, and the transfer roller pair 35 is mounted on the support shaft 520c. A gear 530c meshing with a gear 350a mounted on a rotating shaft 351 of the driving roller 35a is rotatably mounted. A gear 530b is provided between the gear 530a and the gear 530c, and the gear 530b is configured to selectively mesh with the gear 530a and the gear 530c. The gear 530b is rotatably mounted on an operation support shaft 520b that is movably supported in the axial direction by the fixed plate 211 and the support plate 510. An engagement piece 521 is attached to the operation support shaft 520b, and a compression coil spring 522 is disposed between the engagement piece 521 and the gear mounting plate 510. Therefore, the operating support shaft 5
20b is always urged to move upward in the figure by the spring force of the compression coil spring 522. A stopper 523 is provided on the operation support shaft 520b above the gear 530b in the figure, and the stopper 523 is moved to the left by the spring force of the compression coil spring 522, and the gear 530b is moved to the gear 530a.
And the gear mounting plate 5 at a position where the gear mounting plate 5 meshes with the gear 530c.
10. The operation support shaft 520b configured as described above is operated in conjunction with opening and closing of the front cover 3. That is, when the front cover 3 is closed as shown in the figure, the front cover 3 moves the operation support shaft 520b rightward in the drawing against the spring force of the compression coil spring 522, and the operation support shaft 520b Gear 530b is positioned at the position shown by the solid line in the figure, and the transmission connection of the gear mechanism is released. On the other hand, when the front cover 3 is in the open state, the operation support shaft 520
b moves leftward in the figure due to the spring force of the compression coil spring 522, and the gear 530b mounted on the operation support shaft 520b is positioned at the position shown by the solid line in the figure and meshes with the gears 530a and 530c.
Driving roller 36a constituting the registration roller pair 36
The rotation shaft 361 of the drive roller 35a and the rotation shaft 351 of the drive roller 35a constituting the transport roller pair 35 are operatively connected via a rotation mechanism.

Next, the transfer device supporting means of the transfer corona discharge device 14 and the peeling corona discharge device 16 will be described with reference to FIG.
This will be described with reference to FIGS. The transfer device support means includes a transfer device support 70. The transfer device support 70 has a bearing bush 2 whose one end on both sides rotatably supports the rotation shaft 361 of the drive roller 36 a forming the registration roller pair 36 on the side plates 212 of the body housing 2.
13 and 213, it is swingably supported. Placed portions 701 are provided at both ends of the transfer device support base 70. The transfer device support means includes two pressing members 71, 71 for positioning the transfer device support base 70 at the operation position and the retracted position. Each of the two pressing members 71, 71 includes a first mounting portion 711 and a second mounting portion 712, and the mounting portion of the transfer device support 70 on the first mounting portion 711. 70
When the transfer unit 1 is placed, the transfer unit support 70 is positioned at the operation position shown in FIG. 3, and when the placement unit 701 of the transfer unit support 70 is placed on the second placement unit 712, the transfer is performed. The container support 70 is positioned at the retracted position shown in FIG. The lower ends of the two pressing members 71, 71 are attached to the operating shaft 72 rotatably supported by the side plates 212, 212 of the body housing 2 by fixing means such as screws. A release lever 73 is attached to the front end of the operation shaft 72. Therefore, when the release lever 73 is operated in the counterclockwise direction from the state shown in FIG. 3, the operating shaft 72 rotates counterclockwise in the drawing, and the two pressing members 71, 71 attached to the operating shaft 72. Is also rotated to place the receiving portion 701 of the transfer device support 70 on the second receiving portion 712 as shown in FIG. Therefore,
The transfer device support 70 supported by the second mounting portion 712 of the two pressing members 71, 71 is located at the retracted position.

Downstream of the corona discharger 14 for transfer and the corona discharger 16 for peeling, the transfer paper conveyed to the transfer area 22 by the paper supply means 30 and transferred with the toner image by the image forming means is fixed by the fixing means. The transfer paper transporting means 80 for transporting the paper to the transfer paper 100 is provided. Transfer paper transporting means 80
Has a guide plate 81 on the back side and a guide plate 82 on the near side (indicated by a two-dot chain line in FIG. 5), and one of the guide plates 81 , Two notches 811 and 811 are provided. Between the notches 811 and 811 and the guide plates 81 and 82,
A drive roller 84 mounted on a drive shaft 83;
Each of the transport belt mechanisms includes a driven roller 86 mounted on the drive roller 84 and an endless belt 67 wound around the drive roller 84 and the driven roller 86. Drive shaft 83
Is rotatably supported by a partition plate 88 disposed between the side plate 212 on the rear side of the body housing 2, the guide plate 82 on the near side, and the belt mechanism. A gear 89 is mounted. The drive gear 89 is operatively connected to drive means (not shown). The driven shaft 8
5 is rotatably supported by a side plate (not shown) provided on the lower surface of the rear guide plate 81 and the partition plate 87. The guide plate 82 on the front side of the transfer paper transporting means 80 configured as described above has an operation position located at the same height as the guide plate 81 on the back side by the guide plate support means 90, and a lower position than the operation position. It is configured to be positioned at the located evacuation position.

Next, the guide plate supporting means 90 will be described. The guide plate support means 90 is provided with a support plate 91 having one end swingably attached to pins 821 fixed to both sides on the upstream side of the guide plate 82. Support plate 9
A fulcrum portion 91 protruding from both sides is provided at the other end of 1.
1 and 911 are provided, and the fulcrum portions 911 and 91 are provided.
1 is a mounting table 9 disposed downstream of the guide plate support means 90.
2, 92 are rotatably supported. The support plate 91
Are formed on both sides thereof. Below the upstream side of the support plate 91, a rotation plate 94 whose lower end is rotatably supported by the mounts 93, 93 by pins 931 is provided. Pins 941, 941 are attached to the upper end of the rotating plate 94, and these pins 941, 941 are fitted into elongated holes 912, 912 provided on both sides of the support plate 91. A support piece 942 formed of a spring plate is attached to the center of the upper end of the rotating plate 94, and the support piece 942 is configured to support the guide plate 82 in the state shown in FIG. . One end of a connection link 95 is connected to an intermediate portion of the rotation plate 94 by a pin 951. The other end of the connecting link 95 is connected to a lever 96 mounted on the operating shaft 72.
Are connected to each other by a pin 952. The guide plate supporting means 90 thus configured positions the guide plate 82 in the operating position in the state shown in FIG. When the release lever 73 is operated counterclockwise from the state shown in FIG. 3, the operating shaft 72 rotates counterclockwise in the figure, and the lever 96 is also operated counterclockwise. When the lever 96 operates counterclockwise, the rotating plate 94 operates counterclockwise around the pin 931 via the connecting link 95,
Pins 941, 94 attached to the upper end of the rotating plate 94
1 is a long hole 912 provided on both sides of the support plate 91;
Move along 912. As a result, the support plate 91 rotates clockwise about the fulcrum portions 911, 911, so that the guide plate 82 connected to the support plate 91 by the pins 821, 821 is lowered downward as shown in FIG. And is positioned at the retracted position. Thus, in the illustrated embodiment, the release lever 7 is moved from the state shown in FIG.
When the counter 3 is operated in the counterclockwise direction, the transfer device support base 70 can be positioned at the retracted position, and the guide plate 82 constituting the transfer paper transporting means 80 can be positioned at the retracted position.

The outline of the operation of the electrostatic copying machine constructed as described above will be described. The charging corona discharger 1 is rotated while the photosensitive drum 6 is driven to rotate in the direction indicated by the arrow 8.
0 charges the photosensitive layer of the photosensitive drum 6 substantially uniformly to a specific polarity, for example, a positive polarity. Next, in the exposure area 23, the image of the original on the transparent plate 4 is projected on the photosensitive layer of the photosensitive drum 6 by the exposure means 20, and a charged area corresponding to the image of the original, that is, an electrostatic latent image is formed on the photosensitive layer. Is done. The electrostatic latent image is developed into a toner image by supplying toner charged to a specific polarity, for example, a negative polarity, by the developing device 12. On the other hand, the transfer paper fed by the paper feeding means 30 is brought into close contact with the peripheral surface of the photosensitive drum 6 in the transfer area 22, and the toner image on the photosensitive drum 6 is transferred by the action of the transfer corona discharger 14. Transferred to paper. Then, by the action of the corona discharger 16 for peeling,
The transfer paper is peeled from the photosensitive drum 6. The peeled transfer paper is conveyed to the fixing unit 100 and the fixing unit 100
, The toner image on the transfer paper is heated and fixed. The transfer paper on which the toner image has been fixed is placed on a discharge roller pair 1
02 is discharged to the transfer paper receiving table 104. In addition,
The photosensitive drum 6 continues to rotate further, and the cleaning device 1
8 removes toner and the like remaining on the photoreceptor after transfer. When the electrostatic copying machine is used, the rotation mechanism 50 is closed and the rotation mechanism 50 is positioned as shown in FIGS.
Driving roller 36a constituting the registration roller pair 36
The transmission connection between the drive roller 35a and the drive roller 35a constituting the transfer roller pair 35 is released, so that there is no hindrance to independent driving of the transfer rollers when the electrostatic copying machine is used.

Next, a description will be given of a jam processing in a case where a transfer paper jam occurs in the electrostatic copying machine. When a jam occurs, first, the front cover 3 of the body housing 2 is rotated to the front side to open the inside of the body housing 2. When the front cover 3 is opened, the engagement between the operating member 62 attached to the front cover 3 and the operated piece 61 provided on the support plate 51 is released.
1 is rotated counterclockwise around the short axis 52a by the tension coil spring 54. Therefore, the gear 53c mounted on the support plate 51 is connected to the gear 3 mounted on the rotating shaft 351 of the drive roller 35a constituting the transport roller pair 35.
To engage with the pair of registration rollers 36, the rotation shaft 361 of the drive roller 36a forming the registration roller pair 36 and the rotation shaft 351 of the drive roller 35a forming the conveyance roller pair 35 are transmission-coupled via the gear mechanism. Therefore, by gripping a rotation knob 362 attached to the rotation shaft 361 of the drive roller 36a forming the registration roller pair 36 and rotating the drive roller 36a forming the registration roller pair 36, the gear mechanism , The drive roller 35a constituting the transport roller pair 35 can be rotated in the same direction. When the front cover 3 of the body housing 2 is turned to the front side to open the inside of the body housing 2, the release lever 73 is operated counterclockwise from the state shown in FIGS. When the release lever 73 is operated counterclockwise,
As described above, the transfer device support base 70 is positioned at the retreat position, and the guide plate 82 constituting the transfer paper transporting means 80 is positioned at the retreat position (see FIG. 4). When the transfer paper jammed in this state is sandwiched between the pair of registration rollers 36 or the pair of conveyance rollers 35, the driving roller 36a that constitutes the pair of registration rollers 36 by gripping the rotation knob 362 in FIG. By rotating in the counterclockwise direction, the drive roller 35a constituting the transport roller pair 35 can be rotated in the same direction via the gear mechanism. Therefore, the transfer paper jammed by the registration roller pair 36 or the conveyance roller pair 35 is sent to the downstream side, and the transfer paper is transported through the transfer area where the corona discharger 14 for transfer and the corona discharger 16 for peeling are located at the retracted position. Means 80
Transported to When the transfer paper is conveyed to the transfer paper conveyance means 80, the jammed transfer paper can be easily removed because the guide plate 82 on the front side constituting the transfer paper conveyance means 80 is located at the retracted position. .

[0021]

As described above, the image forming apparatus according to the present invention has the following functions and effects.

That is, according to the present invention, when the front cover constituting the body housing is opened, at least two of the plurality of transport rollers constituting the paper feeding means are driven and connected to each other by the rotating mechanism. By rotating a rotary knob attached to at least one of the two transport rollers, the two transport rollers can be simultaneously operated. Therefore, the jammed transfer paper can be sent out by operating only one transport roller without operating a plurality of transport rollers. Further, according to the present invention, when the front cover is closed to use the image forming apparatus, the transmission connection by the rotation mechanism is released by the transmission release means operating in conjunction with the front cover. Therefore, there is no hindrance to independent driving of each of the transport rollers when the image forming machine is used.

[Brief description of the drawings]

FIG. 1 is a perspective view of an image forming apparatus to which the present invention is applied.

FIG. 2 is a schematic configuration diagram illustrating an embodiment of a use state of the image forming apparatus configured according to the present invention.

FIG. 3 is a front view of a main part showing a use state of the image forming apparatus shown in FIG. 2;

4 is an essential part front view showing a state of the image forming apparatus shown in FIG. 2 at the time of jam clearance.

FIG. 5 is a plan view of a main part of the image forming apparatus shown in FIG. 2;

FIG. 6 is a side view showing an embodiment of transmission canceling means provided in the image forming machine shown in FIG. 2;

FIG. 7 is a plan view showing another embodiment of the transmission canceling unit provided in the image forming machine shown in FIG. 2;

[Explanation of symbols]

 2: Airframe housing 3: Front cover 4: Transparent plate 5: Document cover 6: Photoconductor drum 10: Corona discharger for charging 12: Developing device 14: Corona discharger for transfer 16: Corona discharger for peeling 18: Cleaning device 20: Exposure means 30: Paper supply means 31: Transfer paper cassette 32: Feed roller 33: Separation roller pair 34: Transport roller pair 35: Transport roller pair 36: Registration roller pair 50: Rotating mechanism 51: Gear mounting plate 54 : Tension coil spring 60: Transmission releasing means 61: Workpiece 62: Working member 70: Transfer unit support 71: Pressing member 72: Working shaft 73: Release lever 80: Transfer paper conveying means 80 81: Guide plate 82: Guide Plate 90: Guide plate support means 362: Rotating knob 500: Rotating mechanism 53a, 53b, 53c: Gear 350a: Gear 360a: Gear

Continuation of the front page (72) Inventor Yoshihiko Tanaka 1-2-28 Tamatsukuri, Chuo-ku, Osaka-shi Inside Mita Kogyo Co., Ltd. (72) Wataru Sasaki 1-2-28 Tamatsukuri, Chuo-ku, Osaka-shi Mita Kogyo shares Inside the company (72) Inventor Tsuyoshi Koyanagi 1-2-28 Tamatsukuri, Chuo-ku, Osaka-shi Mita Kogyo Co., Ltd. (72) Inventor Megumi Sato 1-2-28 Tatamazo, Chuo-ku, Osaka-shi Mita Kogyo Co., Ltd.

Claims (3)

[Claims] 1. An image forming apparatus comprising: a body housing having a front cover openably and closably mounted on a front surface; an image forming means provided in the body housing; and a transfer sheet for transferring a transfer sheet to a transfer area of the image forming means. An image forming apparatus comprising: a sheet feeding means having a plurality of independently driven conveyance rollers, wherein at least two of the plurality of conveyance rollers are operatively connected to each other when the front cover is open. A rotation mechanism that operates in conjunction with the opening and closing of the front cover, and a transmission release unit that releases the transmission connection by the rotation mechanism when the front cover is closed;
An image forming apparatus comprising: a rotating knob mounted on at least one of the plurality of transport rollers. 2. The rotation mechanism is constituted by a gear mechanism provided on a gear mounting plate.
An actuating member mounted on the front cover for operating the gear mounting plate, wherein when the front cover is closed, the operating member operates the gear mounting plate to release the transmission connection by the gear mechanism. The image forming apparatus according to claim 1. 3. The rotation mechanism is constituted by a gear mechanism, and the transmission canceling means includes an operation support shaft mounted with one gear constituting the gear mechanism and operably supported in the axial direction. 2. The image forming apparatus according to claim 1, wherein when the front cover is closed, the operation support shaft is operated in the axial direction to release the transmission mesh of the gear mechanism.