JP2540191B2 - Image forming device - Google Patents

Description

The present invention relates to an image forming apparatus such as a copying machine or a laser beam printer, and more specifically, to a sheet storage device for storing a large number of sheets inside a main body of the device ( The present invention relates to an image forming apparatus (hereinafter referred to as a copier) having a cassette.

(B) Conventional Technology Conventionally, there is known a copying machine in which a cassette accommodating a large number of sheets is detachably mounted inside the apparatus body. In this case, a friction pad or a sheet separating means is used as the sheet separating means. It uses a retard roller. In addition, it is designed to pull out the jammed sheet in the paper feeding direction (5th
(See FIG. (A)).

(C) Problems to be Solved by the Invention In the copying machine described above, when the jammed sheet is pulled in the sheet feeding direction to remove the jammed sheet, the lower sheet is pulled out by the sheet, and the lower sheet is pulled out. Sometimes came into contact with the separating means 9 and 10 and bent (see FIG. 5 (b)).

As a solution to this drawback, a copying machine has been proposed in which the separating means is retracted from the paper feeding path at the time of jam handling. It has the advantage that it does not remain in the separating means (see FIG. 5 (c)). When the jammed sheet S1 is pulled out in the sheet feeding direction, the friction between the sheets held by the sheet feeding roller 12 increases, so that the lower sheets S2, S3,
There was a problem that S4 was pulled out sequentially (see FIG. 5 (d)).

Therefore, an object of the present invention is to provide an image forming apparatus in which the feeding rotating body is separated from the sheet at the time of processing the jam sheet, and thus the above-mentioned problems are solved.

(D) Means for Solving the Problems The present invention has been made in view of the above circumstances,
A machine body having a sheet storage device that stores the sheet, and a body body that is movably supported up and down so as to come into contact with and separate from the upper surface of the sheet stored in the sheet storage device,
A feeding rotating body that feeds the sheet by rotating in contact with the upper surface of the sheet, a conveying rotating body that is disposed in the machine body on the downstream side of the feeding rotating body, and rotates in the sheet feeding direction, Separation means having a separation rotating body capable of rotating in a direction opposite to the feeding direction, a pair of guide members arranged downstream of the separation means and for guiding the sheets separated by the separation means, and the guide members. An opening mechanism for opening the jammed sheet for jam clearance, a cover provided on the machine body so as to be opened and closed to take out the jammed sheet from the machine body from the guide member opened by the opening mechanism, and the opening mechanism. An image forming apparatus comprising: an interlocking mechanism for separating the feeding rotating body upward from the upper surface of the sheet in association with the opening operation of the guide member by the mechanism.

(E) Operation Based on the above configuration, the sheets stored in the sheet storage device are fed by the feeding rotating body, separated one by one by the separating means, and guided by the pair of guide members to be fed. To be done. If a jam occurs during the feeding of the sheet, by opening the guide member by the opening mechanism,
You can remove the jam sheet from the open cover. Further, at this time, the interlocking mechanism causes the feeding rotating body to move away from the upper surface of the sheet in conjunction with the opening of the guide member. Even if another sheet is to be pulled out by being pulled by a weak frictional force between the sheets, the sheet is stopped by the separating means without being bent, and a sheet with a jam is generated. Only get out.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the copying machine 51 has a machine body 53 that incorporates a copying section 52, and the machine body 53 is a platen 5.
5, light source 56, mirrors 57, 58, 59, 60, 61, 62, lens 63, and two cassettes 65U, 65L for accommodating sheets S that can be detached by moving on guide rails 64a, 64b Each of the cassettes 65U and 65L has an intermediate plate 5 which is biased upward by a pressure plate 6, and the sheet feeding device 1 is disposed in the vicinity of these cassettes 65U and 65L. Further, a paper feed roller 12 is disposed facing the upper side of the cassette 30 in the mounting position, and a separating portion including a transport roller 10 and a separation roller 9 is disposed downstream of the roller 12. There is. A conveying roller pair 85 and a registration roller pair 67 are arranged downstream of the sheet feeding device 1.
The copying unit 52 is arranged downstream of the copying unit 67, and the conveyor belt 69 and the fixing device 70 are arranged downstream of the copying unit 52. Then, a flapper 71,
A pair of paper discharge rollers 72 is provided, and the flapper
A re-conveyance path 73 is provided by being branched to 71, and a re-feed roller pair 75 and a re-feed sensor 76 are arranged in the re-conveyance path 73. Further, the guide rails 64a, 64b are positioned and erected on the body frame, and the front and rear side plates 23, 17 are provided.
The sheet feeding apparatus 1 is positioned by fitting a groove (not shown) (see FIG. 4) with the guide rail 64b. A groove (not shown) for inserting the pressure plate 6 is formed in the guide rail 64b.

The sheet feeding device 1 is shown in FIGS.
As shown in the figure, the paper feed rollers 12 and 12 and the transport rollers 9 and 9 are arranged in a frame body composed of upper and lower stays 86, 87 and 89 arranged substantially parallel to the front and rear side plates 23 and 17, respectively. , Separation rollers 10, 10, sheet presence / absence sensor, pressure plates 6, 6, positioning sensors 15, 15 and guide plates 79, 80, 81, 82, 83, and a pair of transport rollers 85, thereby forming an integrated unit. Has become. Incidentally, reference numerals 49 and 88 in the figure denote sheet sensors.

Further, as shown in FIGS. 1, 3, and 4, pickup release shafts 27U, 27L are pivotally supported between the front and rear side plates 23, 17, and the shaft 27U has a plurality of release plates 27Ua. ... 27Uc is fixed, and a plurality of release plates 27La on the shaft 27L ... 2
7Lc is fixed. Further, the release plate 27Uc is adapted to engage with a pin 28Ua of a release arm 28U which is rotatably supported by a transport roller shaft 9a described later, and the release plate 27Lc is a transport roller shaft 9a described later. Is engaged with the pin 28La of the release arm 28L rotatably supported by. The guide plate 28 is rotatably supported by a shaft 37U arranged across the rear side plate 17 and the side plate 23, and the guide plate 83 includes the rear side plate 17 and the side plate.
It is rotatably supported by a shaft 37L arranged over 23. Further, the guide plates 82 and 83 are connected by a link arm 91, and the guide plate 83 is connected by a link arm 92 to a cover 53a that opens a part of the machine body 53. A protrusion 82a that engages with one end of the release arm 28U is formed at the base end of the guide plate 82, and one end of the release arm 28L is provided at the base end of the guide plate 83. A protruding portion 83a that engages is formed. In addition, the upper stay 8
A shaft 9a is rotatably supported by 6 and a rear plate 17, and a conveying roller 9 is fixed on the front side of the shaft 9a. A pulley 19 is fixed to the tip of the shaft 9a, and a support plate is provided on the back side of the shaft 9a from the conveying roller 9.
11 is rotatably supported. Further, on the inner side of the shaft 9a, an input gear 20 connected to a driving means (not shown) is rotatably supported, and the gear 20 is supported by a clutch 21 supported by the shaft 9a. The drive gear 22 is fixed to the shaft 9a in the vicinity of the input gear 20. And on the front side plate 23,
A pin 25 is fixed on the axis of the shaft 9a, and the support plate 11 'is rotatably supported by the pin 52. Further, a positioning sensor 15 is arranged on the body frame close to the tip of the support plate 11, and the tip of the support plate 11 is positioned between the light emitting part and the light receiving part of the sensor 15. ing. Further, the front side plate 23 and the middle stay 87 are rotatably attached to the shaft 7.
A gear 30 connected to a motor (not shown) is fixed to the front end of the shaft 7, and a pressure plate 6 is fixed to the rear end. Further, the shaft 31 is rotatably supported by the support plates 11 and 11 ',
The paper feed rollers 12 are fixed to both ends of the shaft 31. Further, a pulley (not shown) is fixed to the center of the shaft 31, and a timing belt is provided between the pulley and the pulley 19.
33 are stretched. Then, the middle stay 87 has a support plate 87a.
The shaft 37U is rotatably supported by the support plate 87a and the rear side plate 17, and the gear 40 that meshes with the drive gear 22 is fixed to the rear end of the shaft 37U. Has been done. Further, arms 10a and 10b supporting a shaft 10S to which the separation roller 10 is fixed are swingably supported at the front end of the shaft 37U, and the output drum 41 is adjacent to the arm 10b. It is rotatably supported by the shaft 37U. An input drum 42 is fixed to the shaft 37U in the vicinity of the output drum 41, and a right-handed clutch spring 43 in a front view is wound around the input drum 42 and the output drum 41. And
This constitutes a clutch 45 that operates as a torque limiter in the counterclockwise direction. Reference numeral 46 in the figure denotes a clutch case that protects the clutch spring 43. Further, a gear 37G that rotates integrally with the output drum 41 is provided at the end of the shaft 37U, and the gear 37G meshes with the gear 10G fixed to the shaft 10S of the separation roller 10.

Since the present embodiment is configured as described above, the cassette
When 65U and 65L are attached to the machine body 53 along the guide rails 64a and 64b, the cassette 65 is detected by a cassette sensor (not shown).
U and 65L are detected. Then, the control unit (not shown) that receives the detection signal from the cassette sensor detects that the tip of the support plate 11 is the sensor based on the signal from the positioning sensor 15.
It is determined whether or not 15 is detected, that is, whether the paper feed roller 12 is located at the paper feed position. If it is determined that the paper feed roller 12 is located, the process waits until a start key (not shown) is pressed. If the positioning sensor 15 does not detect the leading end of the support plate 11, the controller rotates the gear 30 in the clockwise direction by a motor (not shown). As a result, the shaft 7 rotates clockwise, and the rotation of the shaft 7 causes the pressure plate 6 to rotate clockwise to rotate the middle plate 5
Is pushed up, and the sheet feeding roller 12 and the support plate 11 are pushed up by the intermediate plate 5 through the sheet S. When the positioning sensor 15 detects the leading end of the support plate 11, the control unit that receives a signal from the sensor 15 determines that the paper feed roller 12 is located at the paper feed position and stops the motor. Then, if the operator, for example, instructs the upper feed and presses the start key,
The input gear 20 rotated by a motor (not shown) by the clutch 21 is connected to the shaft 9a, and the shaft 9a rotates counterclockwise. Further, the rotation of the shaft 9a causes the transport roller 9 and the pulley to rotate.
As the pulley 19 rotates, the rotation of the pulley 19 causes the shaft 31 to rotate counterclockwise via the timing belt 33. Then, the paper feed roller 12 rotates integrally with the shaft 31 to feed the sheet S stacked on the intermediate plate 5, and the sheet S is fed to the transport roller 9. Then, the sheet S is conveyed by the conveying roller 9 and the separating roller 10.
The shaft 27U is rotated counterclockwise by a solenoid (not shown) a predetermined time after reaching the nip between the release plate 27Ua and the release plate 27Ua, which pushes up the resisting portion 11a of the support plate 11. The paper roller 12 moves upward, and the roller 12 is separated from the upper surface of the sheet S. When the number of the conveyed sheets S is one, the separation roller 10 is rotated along with the sheet S conveyed by the conveyance roller 9, and when a plurality of sheets S are multi-fed, the separation roller 10 uses the torque limiter. The reverse operation is performed by the operation of 45, and the sheet S is sequentially pushed back from the lower side. In this way, the sheets S ... Are separated one by one by the conveying roller 9 and the separating roller 10, and the guide 8 is separated.
It is conveyed to the space between 1, 82 and is guided by the guides 81, 82 to the conveying roller pair 85. Further, the sheet S is conveyed to the registration roller pair 67 by the roller pair 85, and the roller pair 67 is conveyed.
The image is copied by being synchronously conveyed to the copying section 52 by the conveyer belt 69 and conveyed to the fixing device 70 by the conveyer belt 69 to fix the image.
The flapper 71 guides the sheet to the sheet discharge roller pair 72, and the sheet discharge roller pair 72 discharges it to the outside of the machine body 53. Further, in the case of double-sided image formation, the sheet S on which the image is copied on one side is a flapper.
The sheet is guided to the re-conveyance path 73 by 71, re-fed to the registration roller pair 67 by the re-feeding roller pair 75, the image is copied on the blank sheet surface in the same manner as described above, and is discharged to the outside of the machine body 53.

If a jam occurs near the copying section 52 or the pair of paper discharge rollers 72, and if continuous copying is in progress, the next sheet S to be copied is being fed by the sheet feeding apparatus 1, and the sheet S is It must be taken out of the apparatus main body 53 according to the jam handling procedure. In this case, the operator confirms the jam position displayed on the operation unit (not shown), and the copy unit 52
The jammed sheet S is removed from the vicinity or the vicinity of the conveyance roller pair 72, and the right cover 53a is opened. The cover 53a
Is opened, the guide plate 82 is rotated from the chain line position to the solid line position via the link arm 92, the guide plate 83, and the link arm 91 (see FIG. 1). Further, due to the rotation of the guide plate 82, the projection 82a of the guide plate 82 abuts on one end of the release arm 28U and swings the arm 28U in the clockwise direction.
The swinging of causes the pin 28Ua to rotate the release plate 27Uc. When the release plate 27Uc rotates, the release plate 27Ua abuts against the opposing portion 11a of the support plate 11 to rotate the support plate 11, and the rotation of the support plate 11 causes the feed roller 12 to be broken. The sheet moves from the position to the solid line position and is separated from the upper surface of the sheet S (see FIG. 1). In this state, the operator pulls out the sheet S being conveyed by the conveying roller 9 in the sheet feeding direction from the opening where the cover 53a was located, and takes it out. At this time, the sheets S other than the sheet S obtain the advancing force only by the friction with the sheet S, but are not brought into contact with the separation roller 10 and pulled out. Then, when the jam processing is finished, the operator closes the cover 53a, and the guide plate 8 is closed by closing the cover 53a.
2,83 return to the position shown in FIG. The sheet S in contact with the separation roller 10 does not hinder the restart.

(G) Effect of the Invention As described above, according to the present invention, the jamming process can be easily performed by opening the pair of guide members by the opening mechanism to pull out the jammed sheet and taking out the jammed sheet from the opened cover. In addition, the sheet other than the jam sheet is not pulled out together with the jam processing, and an accurate sheet feeding operation can be performed after the jam processing is completed.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a main part of an image forming apparatus according to the present invention. Further, FIG. 2 is a front sectional view showing an image forming apparatus according to the present invention, and FIGS. 3 and 4 are views showing a main part thereof. Then, as shown in FIGS. 5 (a), (b),
(C), (d) is a front sectional view showing a conventional example. 9: Transport rotary body, 10: Separation rotary body, 28U, 28L ... Interlocking mechanism, 51 ... Image forming device, 53 ... Device body, 53a ...
… Covers, 65U, 65L …… Sheet storage devices, 81, 82, 83 ……
Guide member, 91, 92, 53a ... Release mechanism, S ... Seat.

Claims (1)

(57) [Claims] 1. A machine body having a sheet storage device for storing a sheet, and an upper surface of the seat body movably supported by the machine body so as to come in contact with and separate from the upper surface of the sheet stored in the sheet storage device. A feeding rotating body that feeds a sheet by rotating in contact with a sheet, a conveying rotating body that is disposed in the machine body on the downstream side of the feeding rotating body, and rotates in the sheet feeding direction, and a sheet feeding Separating means that can rotate in the direction opposite to the direction, a separating means, a pair of guide members arranged downstream of the separating means for guiding the sheets separated by the separating means, and the guide member jammed. An opening mechanism for opening for processing, a cover provided on the machine body so as to be openable and closable for taking out the jammed sheet from the guide member opened by the opening mechanism to the outside of the machine body, An image forming apparatus, comprising: an interlocking mechanism that interlocks with the opening operation of the guide member by the opening mechanism to separate the feeding rotating body upward from the upper surface of the sheet.