JP3653943B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP3653943B2
JP3653943B2 JP20900397A JP20900397A JP3653943B2 JP 3653943 B2 JP3653943 B2 JP 3653943B2 JP 20900397 A JP20900397 A JP 20900397A JP 20900397 A JP20900397 A JP 20900397A JP 3653943 B2 JP3653943 B2 JP 3653943B2
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JP
Japan
Prior art keywords
sheet
recording paper
guiding
means
image forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP20900397A
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Japanese (ja)
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JPH1152749A (en
Inventor
武徳 末永
昌幸 畑
Original Assignee
コニカミノルタホールディングス株式会社
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Priority to JP20900397A priority Critical patent/JP3653943B2/en
Publication of JPH1152749A publication Critical patent/JPH1152749A/en
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Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for transferring an image on an image bearing member, particularly for a thick sheet and for smoothly guiding it to a fixing device.
[0002]
[Prior art]
The image forming apparatus A shown in FIG. 8 forms a toner image on an image carrier 2 (hereinafter referred to as a photosensitive drum), and conveys a sheet P to the position of the transfer unit 4 with a pair of registration rollers 13. After the toner image on the photosensitive drum 2 is transferred to the sheet P (hereinafter referred to as recording paper P) using the transfer device 4, the recording paper P is separated by the separator 5 and the toner image on the recording paper P is transferred to the sheet P (hereinafter referred to as recording paper P). To settle. In the image forming apparatus A, a recording paper guide device 14 is provided together with the rotary claw wheel 15 for guiding the recording paper P to the fixing device F.
[0003]
In general, when the toner image formed on the photosensitive drum 2 is transferred to the recording paper P, the recording paper P that has passed through the pair of registration rollers 13 is guided toward the photosensitive drum 2 by the guide member 131, and first the leading edge. The toner image formed on the photosensitive drum 2 is transferred to the recording paper P by the transfer unit 4 while the recording paper P is brought into close contact with the electrostatic adsorption force of the photosensitive drum 2 surface. Then, the recording paper P is separated by the separator 5 and is guided and fixed to the fixing device F by the recording paper guide device 14.
[0004]
[Problems to be solved by the invention]
By the way, since ordinary recording paper P (45 kg paper or 70 kg paper) that is normally used is weak, the recording paper P is guided while sufficiently adhering at the transfer position by the electrostatic adsorption force of the surface of the photosensitive drum 2. As a result, image transfer unevenness does not occur.
[0005]
However, when image formation is performed on thick recording paper P (110 kg paper or 130 kg paper), when the trailing end of the conveyed thick paper recording paper P passes the registration roller 13, the thick paper recording paper P is on the surface of the photosensitive drum 2. However, since the diameter of the photosensitive drum 2 is small in recent years, the contact surface with the surface of the photosensitive drum 2 is reduced in combination with the stiffness of the cardboard recording paper P. Accordingly, the electrostatic attraction force on the surface of the photosensitive drum 2 is weakened, the conveyance force of the recording paper P is extremely reduced, the thick paper recording paper P is not conveyed following the photosensitive drum 2, and image displacement occurs. There are drawbacks.
[0006]
The present invention is particularly conceived to remedy the above-mentioned drawbacks. That is, it is an object of the present invention to make it possible to perform better image transfer than a photosensitive drum even on a thick recording paper.
[0007]
[Means for Solving the Problems]
  For the above purpose, the present invention provides an image forming apparatus according to claim 1, wherein sheet guiding means for guiding a sheet on which an image formed on an image carrier is transferred by a transfer means to a fixing device is arranged. And
  The sheet guiding means isOne end of the fixing device side is rotatably supported with respect to the main body of the image forming apparatus, and the other end of the transfer means side is movable in a direction of pressing the sheet against the image carrier, and the sheet guide means The other end on the transfer unit side has a rotation holding unit capable of holding the sheet between the sheet guide unit and the sheet guide unit when the other end moves in a direction in which the sheet is pressed against the image carrier. To do,
[0010]
  Claim2In the first mode, when guiding a normal sheet, the first mode in which the sheet guiding means is arranged at a position for guiding a normal sheet, and when guiding a thick sheet, the sheet guiding means is set to a normal sheet. And a second mode in which the sheet is moved in a direction of pressing the sheet against the image carrier.,
[0011]
  Claim3In the second mode, until the leading edge of the thick sheet reaches the sheet guiding means, the sheet guiding means is disposed at a normal sheet guiding position, and the leading edge of the thick sheet reaches the sheet guiding means. Then, the other end of the sheet guide means rotates around a support portion that is rotatably supported on the fixing device side, and the other end on the transfer means side moves in a direction to press the sheet against the image carrier. And guiding the sheet while clamping the sheet at the other end of the moved sheet guiding means together with the rotating clamping means.,
[0012]
  Claim4In the second mode, the thick sheet is guided while being sandwiched by the sheet guiding means and the rotational clamping means, and when the rear end of the thick sheet is transferred, the sheet guiding means is moved to the first mode. Return to the normal sheet guide position in the mode,
[0013]
  Claim5The sheet guiding means includes a sheet guiding member for guiding a sheet to the fixing device and a sheet conveying member for conveying the sheet to the fixing device.,
[0014]
  Claim6The sheet conveying member includes a belt-shaped conveying member that conveys the sheet and a pair of rotating suspension members that suspend the belt-shaped conveying member, and the belt-shaped conveying member is disposed on the rotating suspension member on the image carrier side. A sub-sheet conveying member that is higher than the sheet conveying surface of the member is provided integrally.,
[0015]
  Claim7The sheet guide means guides the sheet from a first sheet guide means for moving the sheet guide means in a direction in which the sheet is pressed against the image carrier, and a predetermined position for guiding the sheet. A second sheet guiding means for moving the sheet guiding means downward while maintaining a predetermined state;,
[0016]
  Claim8InSaidRotating sheet guide means rotatably provided in the image forming apparatus main body, and the second sheet guide means held at one end of the rotating sheet guide meansHaveThe second sheet guide means is moved downward while being held at one end of the rotating sheet guide means.IsThe
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view showing an overall configuration of an image forming apparatus 1 according to the present invention.
[0018]
Hereinafter, the configuration and operation of the image forming apparatus 1 will be described. A charger 3, a developing device 31, a transfer device 4, a separator 5, and a cleaning device 6 are arranged in the order of operation on the outer periphery of the photosensitive drum 2 provided in the image forming apparatus 1, and are integrated as an image forming unit 1A. Is formed.
[0019]
After the electric charge is applied to the surface of the photosensitive drum 2 by the charger 3, a document (not shown) placed on a document placing plate 21 provided at the uppermost part of the image forming apparatus 1 is used as the image forming apparatus 1. Exposure is started by an exposure lamp 22 provided inside. The reflected light of the original exposed by the exposure lamp 22 is connected to a mirror 23 that moves integrally with the mirrors 24 and 25 that are arranged in a V shape that moves at a speed that is half the moving speed of the mirror 23. The light is sequentially reflected by mirrors 27 and 28 arranged in a V shape via the image lens 26, and further irradiated on the surface of the photosensitive drum 2 in the direction of the arrow by a mirror 29 for irradiating a document image. An electrostatic latent image is formed on the surface.
[0020]
Next, the electrostatic latent image is developed by the developing device 31 in the image forming unit 1A to form a visible image as a toner image on the surface of the photosensitive drum 2.
[0021]
Further, paper feeding units 7 and 8 are respectively disposed below the image-type unit 1A. In order to feed the recording paper P stored in the paper feeding units 7 and 8, paper feeding means 9 and 10 are provided. For example, a sheet of recording paper P fed by the paper feeding means 9 or the paper feeding means 10 is conveyed by the guide rollers 11 and 12.
[0022]
The conveyed recording paper P is temporarily stopped by a registration roller 13 provided in the image forming apparatus 1, and feeding is started so that the toner image formed on the photosensitive drum 2 and the recording paper P coincide with each other.
[0023]
Next, the recording paper P is guided in the direction of the photosensitive drum 2 by the guide member 131, enters from the front end of the recording paper P, is conveyed while being electrostatically attracted to the surface of the photosensitive drum 2, and The toner image is transferred onto the recording paper P by the transfer device 4.
[0024]
Next, the recording paper P is separated from the surface of the photosensitive drum 2 by the separator 5, and the recording paper P is transferred to the fixing device 16 by the sheet guiding means 14 (hereinafter referred to as recording paper guiding means 14 using recording paper as a sheet). Guided.
[0025]
The fixing device 16 includes a heat fixing roller 17 and a pressure roller 18, and a toner image on the recording paper P is pressed against the heat fixing roller 17 to be fixed on the recording paper P. The sheet 19 is discharged to the outside by the apparatus 19 and the recording sheet P is discharged to the sheet discharge tray 20.
[0026]
Further, although the exposure optical system of the image forming apparatus 1 has been described with an analog exposure apparatus, the exposed image may be temporarily input to a memory and digital exposure may be performed using a light source including a semiconductor laser and a polygon mirror.
[0027]
Next, the configuration of the recording paper guiding means 14 for guiding the recording paper P with the image transferred thereon to the fixing device 16 will be described in detail.
[0028]
The recording paper guide means 14 includes a first recording paper guide member 41 that is a first sheet guide means and a second recording paper guide member 40 that is a second sheet guide means.
[0029]
The first recording paper guide member 41 has a function of simply guiding the recording paper, and when a thick recording paper P1 is used, the first recording paper guide member 41 moves upward to press the thick recording paper P1 against the surface of the photosensitive drum 2, thereby causing a transfer deviation. A prevention mechanism is provided.
[0030]
The second recording paper guide member 40 has a function of merely guiding the recording paper. However, the second recording paper guide member 40 may be provided with a function of moving downward to facilitate the jam processing. The second moving recording paper guide member 40A will be described later.
[0031]
First, the first recording paper guide member 41 will be described.
[0032]
FIGS. 2A and 2B are a perspective view showing the overall configuration of the recording paper guiding means 14 and a configuration diagram of a mechanism for moving the recording paper guiding member in the direction of the photosensitive drum 2.
[0033]
FIG. 2A is a perspective view when the recording paper guiding means 14 is incorporated in the image forming apparatus 1.
[0034]
The configuration of the recording paper guiding means 14 is provided in the image forming apparatus 1, and a second recording paper guiding member 40 is provided at a position for guiding the recording paper P to which the toner image has been transferred. Adjacent to 40, a belt-like conveying member 42 having a suction hole 43 formed therein is disposed.
[0035]
On the other hand, a support member 412 provided on the fixing device 16 side of the recording paper guide means 14 and a drive shaft 48 supported rotatably on the fixing device 16 side of the second recording paper guide member 40 are rotatably suspended. The rotating member 44 which is a member is fixed. On the other hand, a moving frame body 421 is provided which is rotatable about the drive shaft 48 and whose other end moves in the direction of the photosensitive drum 2. The moving frame body 421 moves in the direction of the photosensitive drum 2. At the end, a rotating member 45 which is a rotating suspension member integrally provided on both sides with auxiliary sheet guide members 46 and 47 (hereinafter referred to as auxiliary recording paper conveying members 46 and 47) is rotatably provided. , 45 suspends the belt-like conveying member 42.
[0036]
A first recording paper guide member 41 is provided, one end of which is rotatable about the drive shaft 48 and the other end of which moves in the direction of the photosensitive drum 2 together with the moving frame body 421 and the belt-like conveying member 42. Further, on the side of the first recording paper guide member 41, the side of the other end of the rotating member 45 is sandwiched with the moving frame body 421 and is provided rotatably.
[0037]
Further, a drive gear G1 is provided at one end of the drive shaft 48, and the gear G is connected to a drive motor (not shown) in order to drive the drive gear G1, and also in FIG. As shown, the drive gear G1 is connected to intermediate gears G2 and G3 that are rotatably provided on the support frame 417.
[0038]
Next, in FIG. 2B, a cardboard selection unit 1A is provided on an operation panel (not shown) provided in the image forming apparatus 1.
[0039]
The present embodiment has a first mode when using ordinary recording paper P and a second mode when using thick recording paper P1, and when using thick recording paper, the thick paper selection means 1A is used. Then, a second mode in which the cardboard is pressed against the photosensitive drum 2 by the first recording paper guide member 41 by pressing an image formation start button (not shown) is selected, and at the same time, a timer built in the control unit C is activated, When the signal is transmitted after the timer elapses, the image forming apparatus 1 is provided with an electromagnet S0 that is turned on and off by the control unit C. As described above, the first electromagnet S0 is used for ordinary recording paper. In this case, the cardboard selection unit 1A turns off the power supply in the control unit C and separates the actuator 415 from the electromagnet S0.
[0040]
On the other hand, the cam CA, the gear G4 on which the missing tooth G0 is formed, and the stopper 414 are integrally provided, and are rotatably provided on the support frame 417, and the locking pin 416 provided on the stopper 414 and the image. The elastic member S provided between the forming devices 1 is biased counterclockwise, but when the actuator 415 is locked to the stopper 414, the missing tooth G0 of the gear G4 faces the intermediate gear G3. Since the intermediate gear G3 and the gear G4 are not connected, and the push-up portion 413 provided on the recording paper guide member 41 and the cam CA are separated from each other, the first recording paper guide member 41 is stopped. The other end of the drive shaft 48 is separated from the photosensitive drum 2 and is disposed substantially horizontally at a first position for guiding the recording paper P, which is a normal plain paper.
[0041]
Further, as shown in FIG. 2A, a suction device 48 is disposed below the first recording paper guide member 41, and the belt-like transport member is sucked from the suction hole 43 provided in the belt-like transport member 42. The recording paper P is attracted to 42.
[0042]
In the state as described above, when the image formed on the photosensitive drum 2 is transferred to the recording paper P and the drive gear G1 rotates in the direction of the arrow by the drive of the gear G, the belt-shaped transport member via the rotating member 44. 42 also moves in the recording paper guide direction and conveys the recording paper P while adsorbing the recording paper P by the suction device 481, and also fixes the recording paper P by the first recording paper guide member 41 and the second recording paper guide member 40. Guide to 16.
[0043]
At that time, the intermediate gear G3 is also rotated by the drive gear G1, but the missing gear G0 of the gear G4 and the intermediate gear G3 are opposed to each other. . Accordingly, the cam CA does not operate.
[0044]
Next, the case where the recording paper guiding means 14 guides the thick recording paper P to the fixing device 16 will be described.
[0045]
FIGS. 3A and 3B are a perspective view showing the overall configuration of the recording paper guiding means 14 and a configuration diagram showing the recording paper guiding member 14 moved in the direction of the photosensitive drum 2.
[0046]
FIG. 3A is a perspective view showing the overall configuration when the recording paper guiding means 14 is incorporated in the image forming apparatus 1.
[0047]
First, the second mode is selected by pressing the cardboard selection means 1A, and at the same time when the image formation start button is pressed, the timer of the control unit C operates to form on the photosensitive drum 2 on the cardboard recording paper P1 (shown in FIG. 4). The image is transferred by the transfer unit 4, and the leading end of the cardboard recording paper P 1 passes through the photosensitive drum 2, and the belt-like conveying member 42 facing the photosensitive drum 2, the first recording paper guide member 41, and the second recording paper. When the timer elapses until the leading edge of the cardboard recording paper P1 reaches the leading edge of the paper guide member 40, the controller C turns on the power, sucks the actuator 415 with the electromagnet S0, and the actuator 415 from the stopper 414. 415 separates.
[0048]
Due to the separation of the actuator 415, the stopper 414 is rotated counterclockwise by the elastic member S, and the gear G4 is also rotated counterclockwise together with the cam CA. Therefore, the missing tooth G0 is rotated to one side and separated from the gear G4. And the intermediate gear G3 are connected, and the gear G4 also rotates counterclockwise.
[0049]
With the above operation, the cam CA rotates to push up the push-up portion 413 of the first recording paper guide member 41, and together with the rotating member 45 provided on the first recording paper guide member 41, one end of the moving frame body 421 is pushed up. When the leading end of the cardboard recording paper P1 passes through the belt-like conveying member 42 suspended from the rotating member 45, one end of the first recording paper guiding member 41 located below the photosensitive drum 2 from the first position. The belt-like conveying member 42 at the position of the rotating member 45 moves close to the second position, and the cardboard recording paper P1 is pressed against the surface of the photosensitive drum 2 until the cam CA passes the position of the push-up portion 413 (FIG. 4). Explain in detail).
[0050]
Next, in FIGS. 4 (a), (b) and 5, plain paper recording is performed using the mechanisms shown in FIGS. 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b). They are a front view and a side view showing the operating state of the recording paper guiding means when using paper and when using thick recording paper.
[0051]
FIG. 4A shows a recording sheet guiding means when a plain recording sheet P is used. As the recording sheet guiding means, only the belt-like conveying member 42 is shown and described for the sake of simplicity.
[0052]
The recording paper P guided by the guide plate 131 enters the surface of the photosensitive drum 2 from the front end of the recording paper P, and sufficiently adsorbs the recording paper P, which is plain paper, by the electrostatic adsorption of the photosensitive drum 2. The image formed on the photosensitive drum 2 is transferred by the transfer device 4, and the recording paper P is separated from the photosensitive drum 2 by the separator 5.
[0053]
As shown in the figure, in the case of ordinary recording paper P, as described with reference to FIG. 2, when the thick paper selection means 1A does not select the thick paper, the first mode is activated and the control unit C can be operated even if the image formation start button is pressed. In this state, the cam CA is separated from the push-up portion 413 of the first recording paper guide member 41, and the belt-shaped conveying member 42 together with the rotating member 45 is the recording paper guide position H which is the first position. The recording paper P is guided between the heat fixing roller 17 of the fixing device 16 and the pressure roller 18 by the belt-like conveying member 42 that is held at the position and moves the recording paper P in the recording paper guiding direction, and the image on the recording paper P is fixed.
[0054]
In addition, rotating claw wheels 15 and 151 which are rotary clamping members are provided at a substantially central position where the recording paper P passes under the cleaning device 6, and guides the recording paper P curved upward.
[0055]
FIG. 4B shows the recording paper guiding means when using the thick recording paper P1 in the present invention.
[0056]
The thick recording paper P1 guided by the guide plate 131 enters the surface of the photosensitive drum 2 from the leading end of the recording paper P, and the thick recording paper P1 is attracted to the photosensitive drum 2 by electrostatic adsorption of the photosensitive drum 2. The formed image is transferred by the transfer device 4, and the recording paper P 1 thicker than the photosensitive drum 2 is separated by the separator 5.
[0057]
As shown in the drawing, in the case of thick recording paper P1 (hereinafter referred to as thick paper recording paper P1), the second mode is selected by the thick paper operation button 1A as described in FIG.
[0058]
First, a timer is activated by a copy start operation of the image forming apparatus 100, and the belt-like conveyance member 42 constituting a part of the second recording paper guide member 41 is a first position where the ordinary recording paper P is guided. The toner image formed on the photosensitive drum 2 is started from the leading end of the thick paper recording paper P1 by the transfer device 4 at the position of the 1 mode.
[0059]
Next, when the leading end of the cardboard recording paper P1 reaches the position of the belt-like conveying member 42, the control unit C pushes up the second recording paper guiding member 41 shown in FIG. The mechanism starts operating, and the belt-like conveying member 42 is pushed up by the cam CA. As a result of the pushing-up operation, the rotating member 45 provided at the other end of the belt-like conveying member 42 is moved from the position H toward the photosensitive drum 2 around the drive shaft 48 as a support portion, and the cardboard recording paper P1 is pushed up. To the second position H1, and is brought into contact with the surface of the photosensitive drum 2.
[0060]
When the push-up of the belt-shaped conveyance member 42 is completed by the cam CA, the cardboard recording paper P1 is sandwiched between the belt-shaped conveyance member 42 and the rotary claw wheel 15 which is a rotation clamping means via the rotation member, and the fixing device is surely secured. Guided in 16 directions.
[0061]
In addition, the auxiliary recording paper conveying members 46 and 47 provided in the vicinity of the photosensitive drum 2 around the drive shaft 48 of the rotating member 44 provided on the fixing device 16 side are brought close to the photosensitive drum 2 together with the rotating member 45. Move to.
[0062]
Accordingly, the belt-shaped conveying member 42 also moves together with the rotating member 45 from the recording paper guide position H that is the first position to the recording paper guide position H1 that is the second position. When the leading edge of the thick paper recording paper P1 enters and is guided by the belt-like conveying member 42 as recording paper guiding means, the power is turned on by the timer and the belt is moved. The conveying member 42 is moved together with the rotating member 45 in the direction approaching the photosensitive drum 2.
[0063]
Due to the above-described action, even if it is a thick paper recording paper P1 that is not sufficiently electrostatically attracted to the photosensitive drum 2, the thick paper recording paper P1 with respect to the surface of the photosensitive drum 2 by the rotating member 45 of the belt-like conveying member 42. In the direction in which the image is moved, it is curved and brought into close contact with each other, and good image transfer can be performed without deviation between the surface of the photosensitive drum 2 and the cardboard recording paper P1.
[0064]
Further, after the rear end of the thick paper recording paper P1 passes the registration roller 13 shown in FIG. 1, the thick paper recording paper P1 is guided only by the close contact with the surface of the photosensitive drum 2, so that the stable sheet guidance is possible. 5, the cardboard recording paper P1 is adsorbed by the suction device 481 from the suction hole 43 formed in the belt-like conveying member 42 as shown in FIG. 5, and further formed at a height L from the position of the belt-like conveying member 42. The auxiliary recording paper transport members 46 and 47 are overcome and adhered to the waist of the cardboard recording paper P1 to give a transporting force, and further provided with a rotary claw wheel 15 at a position for guiding and transporting the cardboard recording paper P1. By holding and guiding the thick paper recording paper P1 between the conveying member 42 and the rotating claw wheel 15, stable guidance is possible, and in particular, image formation after the thick paper recording paper P1 passes the registration roller 13 is stabilized.
[0065]
After the thick paper recording paper P1 passes through the surface of the photosensitive drum 2 and the transfer of the toner image is completed, the ordinary conveying paper 42 which is the first position is guided by the rotation of the cam CA. Return to position.
[0066]
The rotating pinion wheel 15 serving as the rotation clamping means is a rotating body with a sharp tip and a star shape, and the star tip contacts the cardboard recording paper P1 and rotates by the movement of the cardboard recording paper P1. is there.
[0067]
As described above, the first recording paper guiding member 41 has been described. Next, the second recording paper guiding means 40 which is the second sheet guiding means of the recording paper guiding means 14 described with reference to FIGS. Will be described with respect to the embodiment shown by the second moving recording paper guide member 40A that can perform jam processing.
[0068]
FIG. 6 is a perspective view showing recording paper guide means capable of jamming.
[0069]
A pair of registration rollers 13 is rotatably provided in the image forming apparatus 1 and is rotated by a drive gear (not shown) to convey the recording paper P in the direction of the arrow.
[0070]
Further, the transfer unit 4 and the separator 5 are provided on the moving frame 401, and a part of the moving frame 401 is rotatably provided on one shaft of the registration roller 13.
[0071]
Between the support member 413 fixed to the image forming apparatus 1 and the support member 408, a rotating recording paper guide member 405 as rotating sheet guide means is rotatably supported by support shafts 409 and 411, and the rotating recording paper is provided. One end of a second moving recording paper guide member 40A, which is capable of jamming the second sheet guide means, is connected to the other end of the guide member 405 by a connecting shaft 412.
[0072]
Further, a pivotable shaft 415 is provided on the support member 416 fixed to the image forming apparatus 1, and a push-up operation means 414 is provided at one end of the shaft 415, and the push-up operation means 414 performs a push-up operation. Then, the lower end of the second moving recording paper guide member 40A is pushed up, and the rotating recording paper guide member 405 and the second moving recording paper guide member 40A are moved to the position where the recording paper P is guided to the position where the recording paper P is guided. While being held in a substantially horizontal direction, the transfer device 4 and the separator 5 are also held at predetermined positions by the push-up operation of the push-up operation means 414. (Details are explained in FIG. 7)
Note that the recording paper guide front end 410 at the position where the second moving recording paper guide member 40A is connected by the connecting shaft 412 is formed so as to overlap the upper side of the rotating recording paper guide member 405 so that the recording paper P can be smoothly fed. It is arranged to be guided.
[0073]
7A and 7B, the rotating recording paper guide member 405 and the second moving recording paper guide member 40A are held by the link mechanism at the position where the recording paper P is guided, and the transfer device 4 and the separator 5 are used. Is held at a predetermined position, and when the recording paper P is jammed, the rotating recording paper guide member 405, the second moving recording paper guide member 40A, the transfer device 4, and the separator 5 are moved downward by the link mechanism. It is a front view.
[0074]
In FIG. 7A, a first push-up member 421 is rotatably provided on a support member 418 provided in the image forming apparatus 1 via a support shaft 426, and further, a support member 419 provided in the image forming apparatus 1. The shaft 415 is rotatably fitted to the shaft 415, and one end of the second push-up member 422 is fixed to the shaft 415.
[0075]
Then, a connecting member 420 is provided between the first push-up member 421 and the second push-up member 422 formed with substantially the same length, and the first push-up member 421 is also rotated by the support shaft 426 by the rotation of the second push-up member 422. A moving link mechanism is configured.
[0076]
Further, rollers 4221 and 4222 are provided at the tips of the first push-up member 421 and the second push-up member 422.
[0077]
One end of a push-up member 424 for pushing up the moving frame 401 provided with the transfer device 4 and the separator 5 is supported on the support member 425 fixed to the image forming apparatus 1, and a cam provided on the shaft 415. In 423, the moving frame 401 is operated up and down with the tip of the push-up member 424.
[0078]
In order to hold the rotary recording paper guide member 405 and the second moving recording paper guide member 40A configured as described above at the position for guiding the recording paper P, the push-up operation means 414 shown in FIG. Thus, the roller 4222 of the second push-up member 422 is engaged between the projections 404A and 404B provided on the lower part of the second recording paper guide member 404 at the position where the second push-up member 422 provided on the shaft 415 is in the upright state. Stopped.
[0079]
In this state, the first push-up member 421 that is simultaneously rotated by the connecting member 420 is also in an upright state, and is placed in the first push-up member 421 and the rollers 4221 and 4222 of the second push-up member 422 in the second recording. A paper guide member 404 is supported at a first position for guiding the recording paper P.
[0080]
When the second moving recording paper guide member 40A is supported at the position for guiding the recording paper P, the rotational recording paper guide member 405 is also rotated upward with the support shafts 411 and 409 as fulcrums via the connecting shaft 412. It is supported at a position, and is held at a substantially horizontal position that guides the recording paper P that is at the same position as the second moving recording paper guide member 40A as shown.
[0081]
Further, by rotating the push-up operation means 414, the push-up member 424 is pushed up by the cam 423 provided on the shaft 415. By pushing up the lower side of the moving frame body 401 at the tip of the push-up member 424, the push-up member 424 is registered. The transfer unit 4 and the separator 5 are held at predetermined positions with respect to the photosensitive drum 2 by rotating upward with the shaft of the roller 13 as a fulcrum.
[0082]
In FIG. 7B, the recording paper P is jammed at the position of the second moving recording paper guide member 4, and the rotating recording paper guide member 405 and the second moving recording paper guide member 40A guide the recording paper P. The position is shown as being moved downward from the holding position.
[0083]
By rotating the push-up operation means 414 shown in FIG. 6 in the direction of the arrow, the second push-up member 422 provided on the shaft 415 moves laterally from the upright state, and the roller 4222 of the second push-up member 422 moves to the projection 404A. , 404B are disengaged from each other, and the first push-up member 421 that is simultaneously rotated by the connecting member 420 in this state also moves in the lateral direction from the upright state, so that the first push-up member 421 and the second push-up member 422 The second moving recording paper guide member 40A moves out of the state of being placed on the rollers 4221 and 4222 and moves downward to the third position.
[0084]
When the second moving recording paper guide member 40A moves by its own weight downward, which is the third position, the rotating recording paper guide member 405 connected to the connecting shaft 412 at one end also moves downward with the support shafts 411, 409 as fulcrums. The second moving recording paper guide member 40A moves the guide position of the recording paper P in a state where one end of the second moving recording paper guide member 40A is supported by the connecting shaft 412 as shown in the drawing. It moves downward while being held and is held on the first push-up member 421 and the second push-up member 422 rotated in the lateral direction, and stops.
[0085]
In this state, the second moving recording paper guide member 40A is moved downward while maintaining the guiding state of the recording paper P, so that the jammed recording paper P is largely opened and the fingertip can be easily inserted. In particular, it is possible to easily take out a small-sized recording paper P that has become jammed.
[0086]
Further, when the push-up operation means 414 is rotated, the moving frame body 401 is released from the push-up operation by the push-up member 424 by the cam 423 provided on the shaft 415, and the tip of the push-up member 424 moves downward. The moving frame 401 rotates downward with the axis of the registration roller 111 as a fulcrum, and the transfer unit 4 and the separator 5 are separated from a predetermined position with respect to the photosensitive drum 2, and the recording paper P is released. It becomes.
[0087]
【The invention's effect】
  In claim 1,
In an image forming apparatus provided with sheet guiding means for guiding a sheet on which an image formed on an image carrier is transferred by a transfer means to a fixing device,
  The sheet guiding means isOne end of the fixing device side is rotatably supported with respect to the main body of the image forming apparatus, and the other end of the transfer means side is movable in a direction of pressing the sheet against the image carrier, and the sheet guide means The other end on the transfer unit side has a rotation holding unit that can hold the sheet between the sheet guide unit and the sheet guide unit when the other end moves in a direction in which the sheet is pressed against the image carrier.Thus, even a thick paper sheet can be pressed against the image carrier at the time of transfer, so that a good image can be recorded even on the thick paper sheet.At the same time, one end of the sheet guiding means is rotatably supported on the fixing device side with respect to the image forming apparatus main body, and the other end on the transfer means side is movable in a direction of pressing the sheet against the image carrier. Since the sheet guide means is rotatably supported on the fixing device side, only the image carrier side is brought close to the sheet guide means and the sheet is pressed against the image carrier at the time of transfer so that the sheet guide means comes into close contact with the image guide body. The sheet guiding means does not move at the position where the sheet enters the fixing device, making it easy for the sheet to enter the fixing device and reducing the production cost.
[0090]
  Claim2In the first mode, when guiding a normal sheet, the first mode in which the sheet guiding means is arranged at a position for guiding a normal sheet, and when guiding a thick sheet, the sheet guiding means is set to a normal sheet. In the second mode for guiding a thick sheet, the second mode moves in the direction in which the sheet is pressed against the image carrier from the position where the sheet is guided. By moving the sheet in the direction of pressing the sheet against the image carrier by the sheet guiding means, the thick sheet can be pressed against the image carrier to perform good image transfer.
[0091]
  Claim3In the second mode, until the leading edge of the thick sheet reaches the sheet guiding means, the sheet guiding means is disposed at a normal sheet guiding position, and the leading edge of the thick sheet reaches the sheet guiding means. Then, the other end of the sheet guide means rotates around a support portion that is rotatably supported on the fixing device side, and the other end on the transfer means side moves in a direction to press the sheet against the image carrier. When the leading edge of the sheet reaches the sheet guiding means, the sheet guiding means is pressed in the direction of the image carrier by guiding the sheet while holding the sheet at the other end of the moved sheet guiding means together with the rotating clamping means. Since the leading edge of the sheet is guided while being securely clamped by the rotating clamping means and the sheet guiding means, the thick sheet is reliably guided and conveyed, and in particular, the trailing edge of the sheet passes through the registration rollers. Okuchikara be lowered, the sheet in the transfer deviation cardboard does not occur.
[0092]
  Claim4In the second mode, the thick sheet is guided while being sandwiched by the sheet guiding means and the rotating sandwiching means, and when the rear end of the thick sheet is transferred, the sheet guiding means is moved to the first mode. By returning to the normal sheet guide position in the mode, after the image transfer of the thick sheet is completed, the sheet is guided at the normal sheet guide position in the first mode. Guidance is smooth and fixing failure does not occur. In addition, since the sheet guiding means is normally arranged at the normal sheet guiding position in the first mode, there is no need to perform the switching operation from the second mode to the first mode, and the ordinary sheet is normally guided smoothly. I can do it.
[0093]
  Claim5The sheet guiding means includes a sheet guiding member that guides the sheet to the fixing device and a sheet conveying member that conveys the sheet to the fixing device. Since the sheet is forcibly conveyed, the sheet can be smoothly guided to the fixing device, and jamming can be prevented.
[0094]
  Claim6The sheet conveying member includes a belt-shaped conveying member that conveys the sheet and a pair of rotating suspension members that suspend the belt-shaped conveying member, and the belt-shaped conveying member is disposed on the rotating suspension member on the image carrier side. By providing the sub-sheet conveyance member that is higher than the sheet conveyance surface of the member, even if the trailing edge of the sheet passes through the registration rollers and the sheet conveyance force decreases, the sub-sheet conveyance member strongly contacts The sheet is smoothly guided and conveyed without delay, and transfer deviation does not occur.
[0095]
  Claim7The sheet guide means guides the sheet from a first sheet guide means for moving the sheet guide means in a direction in which the sheet is pressed against the image carrier, and a predetermined position for guiding the sheet. Since the sheet guide means is largely opened by the second sheet guide means for moving the sheet guide means downward while maintaining a predetermined state, a jam occurs at the position of the sheet guide means. But you can easily remove the sheet.
[0096]
  Claim8In this case, a rotatable sheet guide means provided rotatably on the image forming apparatus main body, the second sheet guide means held at one end of the rotatable sheet guide means, and one end of the rotatable sheet guide means. Since the second sheet guide means is moved downward while being held in place, the sheet guide means is greatly opened. Therefore, even if a jam occurs at the position of the sheet guide means, the sheet is easily removed. In addition, it is a simple mechanism and can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a front view showing an overall configuration of an image forming apparatus according to the present invention.
FIG. 2 is a perspective view showing the overall configuration of the recording paper guiding means of the present invention, and a configuration diagram of a mechanism for moving the recording paper guiding member in the direction of the photosensitive drum.
FIGS. 3A and 3B are a perspective view illustrating an overall configuration in a state in which the recording paper guide unit of the present invention is operated, and a configuration diagram of a mechanism illustrating a state in which the recording paper guide member is moved in the direction of the photosensitive drum.
FIG. 4 is a front view showing the operating state of the recording paper guiding means when plain paper recording paper is used with the recording paper guiding means of the present invention and when thick paper recording paper is used.
FIG. 5 is a side view of recording paper guiding means of the present invention.
FIG. 6 is a perspective view showing recording paper guide means capable of jam handling according to the present invention.
FIG. 7 is a front view showing recording paper guide means capable of jam handling according to the present invention.
FIG. 8 is a front view showing conventional recording paper guiding means.
[Explanation of symbols]
1 Image forming device
1A Image forming unit
2 Photosensitive drum
3 Charger
31 Developing device
6 Cleaning device
7,8 Paper feed unit
9, 10 Paper feeding means
14 Recording paper guide means
15,151 Rotating Claw Wheel
16 Fixing device
40 Second recording paper guide member
41 First recording paper guide member
40A Second moving recording paper guide member
42 Belt-shaped conveying member
44, 45 Rotating member
481 Suction device
CA cam
P, P1 recording paper

Claims (8)

  1. In an image forming apparatus provided with sheet guiding means for guiding a sheet on which an image formed on an image carrier is transferred by a transfer means to a fixing device,
    One end of the sheet guiding unit is rotatably supported on the fixing device side with respect to the image forming apparatus main body, and the other end on the transfer unit side is movable in a direction in which the sheet is pressed against the image carrier. Rotational clamping means capable of sandwiching the sheet between the sheet guiding means and the other end of the sheet guiding means on the transfer means side when moving in the direction of pressing the sheet against the image carrier. an image forming apparatus comprising Rukoto to have a.
  2. When guiding an ordinary sheet, the first mode in which the sheet guiding means is disposed at a position for guiding an ordinary sheet; and when guiding a thick sheet, the sheet guiding means is disposed at a position for guiding an ordinary sheet. The image forming apparatus according to claim 1, further comprising: a second mode that moves in a direction in which the sheet is pressed against the image carrier .
  3. In the second mode, until the leading edge of the thick sheet reaches the sheet guiding means, the sheet guiding means is disposed at a normal sheet guiding position, and when the leading edge of the thick sheet reaches the sheet guiding means, the fixing is performed. The other end of the sheet guide means rotates around a support portion that is rotatably supported on the apparatus side, and the other end on the transfer means side moves in a direction to press the sheet against the image carrier, and the rotation holding The image forming apparatus according to claim 1, wherein the sheet is guided while being sandwiched by the other end of the moved sheet guiding unit together with the unit.
  4. In the second mode, the thick sheet is guided while being sandwiched by the sheet guiding means and the rotational clamping means, and when the rear end of the thick sheet is transferred, the sheet guiding means is the normal mode in the first mode. The image forming apparatus according to claim 2 , wherein the image forming apparatus returns to the sheet guide position .
  5. 5. The sheet guide unit according to claim 1, further comprising: a sheet guide member that guides a sheet to the fixing device; and a sheet transport member that transports the sheet to the fixing device. 2. The image forming apparatus according to item 1 .
  6. The sheet conveying member includes a belt-shaped conveying member that conveys a sheet and a pair of rotating suspension members that suspend the belt-shaped conveying member, and the sheet conveying member of the belt-shaped conveying member is conveyed to the rotating suspension member on the image carrier side. 6. The image forming apparatus according to claim 5, wherein a sub-sheet conveying member that is higher than the surface is provided integrally .
  7. The sheet guiding means has a first sheet guiding means for moving the sheet guiding means in a direction in which the sheet is pressed against the image carrier, and a predetermined state for guiding the sheet from a predetermined position for guiding the sheet. The image forming apparatus according to claim 1, further comprising a second sheet guide unit that moves the sheet guide unit downward while maintaining the image forming unit.
  8. The image forming apparatus main body has a rotatable sheet guide means provided rotatably, and the second sheet guide means held at one end of the rotatable sheet guide means, and has one end of the rotatable sheet guide means. The image forming apparatus according to claim 7, wherein the second sheet guide unit is moved downward while being held by the printer .
JP20900397A 1997-08-04 1997-08-04 Image forming apparatus Expired - Fee Related JP3653943B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20900397A JP3653943B2 (en) 1997-08-04 1997-08-04 Image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20900397A JP3653943B2 (en) 1997-08-04 1997-08-04 Image forming apparatus

Publications (2)

Publication Number Publication Date
JPH1152749A JPH1152749A (en) 1999-02-26
JP3653943B2 true JP3653943B2 (en) 2005-06-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP20900397A Expired - Fee Related JP3653943B2 (en) 1997-08-04 1997-08-04 Image forming apparatus

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JP (1) JP3653943B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5744533B2 (en) * 2011-01-19 2015-07-08 キヤノン株式会社 Image forming apparatus
CN102602724A (en) * 2012-03-19 2012-07-25 东莞市耀盛机械有限公司 Backing paper feeding mechanism of paper pasting machine
JP5983027B2 (en) * 2012-05-23 2016-08-31 富士ゼロックス株式会社 Image forming apparatus
CN102975562B (en) * 2012-11-14 2014-12-24 广东金玉兰包装机械有限公司 Laminating machine having four paper feeding stations
CN104310086A (en) * 2014-10-11 2015-01-28 温州永邦机械有限公司 Paper pasting machine
JP2016185876A (en) * 2015-03-27 2016-10-27 富士ゼロックス株式会社 Image formation system and recording material housing device
ES2679894B1 (en) * 2017-02-20 2019-04-02 Latorre Jesus Francisco Barberan System of control of height of impression substrates for digital printing machines

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