JPH1160078A - Sheet refeed device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive device which can prevent an end part of a sheet from being bent, breaking and so forth which cause a jam after refeed. SOLUTION: When a bottom panel or sheets loaded and stacked on the bottom panel is made into contact with a feed roller by a solenoid, a change- over means 55 is changed over by the solenoid so as to connect a drive source 54 to a first moving and urging means 37 for a tip end abutting member 39. When the bottom panel or the sheets stacked on the bottom panel and the feed roller are separated from each other by the solenoid, the change-over means is changed over by the solenoid, and accordingly, the drive source 54 is connected to a second moving and urging means 48 for side guides 43, 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet re-feeding device capable of stacking, storing, and re-feeding a sheet having an image formed on one side, and for example, capable of forming images on both sides of the sheet. The present invention relates to a sheet re-feeding device used for various image forming apparatuses.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, an image forming apparatus capable of forming an image on both sides of a sheet stores and stacks a sheet having an image formed on one side, and forms the image on the sheet. And a sheet refeeding device capable of refeeding the sheet.

For example, in the sheet re-feeding apparatus shown in FIG. 12, when stacking and storing a sheet having an image formed on one surface thereof on a stacker 501, a leading end portion (re-starting position) of the sheet carried in by a friction wheel 502 is stored. The leading end abutting plate 503 for abutting and regulating the leading end of the sheet is controlled so as to move in accordance with the size of the sheet so that the trailing end of the sheet has a fixed positional relationship with the friction wheel 502 during feeding. ing. Further, a lateral width regulating plate 504 for aligning the conveyed sheet in the width direction (a direction orthogonal to the conveying direction) is controlled so as to be movable toward and away from the end of the sheet.

[0004] Then, as shown in FIG. 13, the tip abutting member 503 and the width regulating plate 504 are driven by the same driving source M,
A dedicated solenoid 505 is used for switching the drive.

Further, as shown in FIG. 14, the sheet is brought into contact with the friction wheel 502 at the time of refeeding, so that the sheet is
A push-up plate 506 for contacting / separating from 502 is connected to a drive source (not shown) by a number of gears and the like, and is vertically moved (contact / separation) via a switching unit switched by a solenoid 507.
I was letting it.

[0006]

However, in the above-mentioned conventional example, a dedicated solenoid 505 is used for switching the driving of the front end abutting plate 503 and the lateral width regulating plate 504, and the driving system is also used for the vertical movement of the push-up plate 506. In addition, the use of the solenoid 507 causes an increase in the size and cost of the apparatus.

Further, when the push-up plate 506 rises while the width regulating plate 504 is moving (during sheet alignment) due to malfunction or the like, and the sheet comes into contact with the friction wheel 502, the sheet can be moved (aligned) by friction with the friction wheel 502. As a result, the end of the sheet abutting on the width regulating plate 504 may be broken or broken, which may cause a jam after re-feeding.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small and inexpensive apparatus that prevents the sheet end from being broken or torn, which may cause a jam after re-feeding.

[0009]

In order to achieve the above object, a typical configuration of the present invention is a storage section for loading and storing a sheet having an image formed on one surface, and a storage section for storing a sheet on which an image is formed. A first regulating member movable in a conveying direction for abutting and regulating an end portion of the sheet in the conveying direction, and a first regulating member movable in a width direction perpendicular to a conveying direction of the sheet accommodated in the accommodating portion; A movable second regulating member, re-feeding means for re-feeding the sheets stored in the storage portion, first moving biasing means for moving the first regulating member in a conveying direction, Second movement urging means for moving the regulating member in the width direction, a drive source connecting the first movement urging means and the second movement urging means in common, the driving source and the first movement urging means Switching means for switching the connection of the second movement urging means; A contact / separation urging means for contacting / separating the re-feeding means from / to the sheet stacked and accommodated in the container or the accommodation part, wherein the switching means is switched by the contact / separation urging means, It is characterized in that a drive source and the first movement urging means or the second movement urging means are selectively connected.

[0010] According to the above construction, the first regulating member and the second regulating member are brought into contact with or separated from the accommodating portion or the sheets stacked and accommodated in the accommodating portion by the contact / separation urging means for abutting / separating the re-feeding means. Since the driving of the members is switched, for example, the contact and separation of the sheet and the re-feeding unit and the driving of the first regulating member and the second regulating member are switched by one solenoid as the contact / separation urging unit. Therefore, a small and inexpensive device can be realized.

When the re-feeding means comes into contact with the storage section or the sheets stacked and stored in the storage section by the contact / separation urging means, the switching means is switched by the contact / separation urging means and the drive source is switched. And the first moving biasing means of the first regulating member are connected to each other, and when the re-feeding means is separated from the accommodating portion or the sheets stacked and accommodated in the accommodating portion by the contact / separating urging means, the contact / separating urging means is Thus, the switching means is switched to connect the drive source to the second movement urging means of the second regulating member.

According to the above arrangement, when the sheet is in contact with the re-feeding means, the driving source and the first movement urging means of the first regulating member are connected, and the driving source for the second regulating member is Since the transmission of the driving force is interrupted, the sheet does not come into contact with the re-feeding means during the movement of the second regulating member.
Even if the sheet and the re-feeding unit come into contact with each other during the movement of the second regulating member due to malfunction or the like, the second regulating member stops moving. The problem of jamming later can be solved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sheet re-feeding apparatus to which the present invention is applied will be specifically described below with reference to the drawings. In the following description, a sheet re-feeding device used in an image forming apparatus capable of forming an image on both sides of a sheet is exemplified.

[First Embodiment] An image forming apparatus provided with a sheet re-feeding device according to a first embodiment will be described in detail with reference to the drawings. In this embodiment, an electrophotographic copying machine is exemplified as the image forming apparatus.

First, the overall configuration of the image forming apparatus according to the first embodiment will be described with reference to FIG. Here, the overall configuration will be described along the flow of the sheet.

The image forming apparatus 200 is provided with a plurality of front loading type paper feed cassettes 201 and 202. Sheets S1 and S2 of different sizes are stacked and stored in the respective sheet cassettes 201 and 202. For example, an A5 size or statement size sheet S1 is loaded and stored in the cassette 201, and an A4 size, B5 size or letter size sheet S2 is loaded and stored in the cassette 202.

In the image forming apparatus 200, the sheets S1 and S2 in the sheet cassettes 201 and 202 are selectively fed. The sheets S1 and S2 stacked and stored in the sheet cassettes 201 and 202 are sequentially fed out from the top sheet by a sheet feeding roller 205 rotating counterclockwise in the drawing. Only the top sheet of the sheet S fed out by the sheet feeding roller 205 is separated by the separation roller pair 206, and sent to the registration stopped roller pair 213 via the conveyance roller pairs 207, 208, and 209. .

The pair of conveying rollers 207, 208, and 209 convey the sheet until the leading end of the sheet strikes the nip of the pair of registration rollers 213 to form a predetermined amount of loop. The skew state of the sheet is corrected by the formation of the loop.

The sheet whose skew has been corrected has a registration roller pair which starts rotating at a timing when the position of the toner image on the photosensitive drum 214 rotating clockwise in FIG. By 213, the sheet is sent to a transfer section between the photosensitive drum 214 and the transfer charger 215.
Then, while passing through the transfer section, the toner image on the photosensitive drum 214 is sequentially transferred to the sheet surface by the transfer charger 215.

The sheet on which the toner image has been transferred is sent to a fixing roller pair 217 by a conveyor belt 216. Then, the toner image is heated and pressed while passing through the nip of the fixing roller pair 217, so that the transferred toner image is fixed on the sheet surface.

After the fixing process of the toner image is completed, the conveying roller pair
The sheet conveyed by the 218 is
The paper is sent to a paper discharge roller pair 220 through a paper discharge path 219, and is discharged onto a paper discharge tray 221 outside the apparatus by the paper discharge roller pair 220. In the normal mode, the flapper 222 opens the paper discharge path 219 and closes the vertical path 223 as shown by the solid line in the figure.

In the case of the duplex mode, the sheet conveyed by the conveying roller pair 218 after the completion of the fixing process of the toner image is subjected to a vertical path 22 leading to a sheet re-feeding device described later.
Sent to 3. In this case, the flapper 222 rotates counterclockwise in the figure, closing the discharge path 219 and opening the vertical path 223.

In the case of the double-sided mode, the sheet sent to the vertical path 223 is conveyed by the conveying roller pairs 224 and 225 to the carry-in path 227.
To the discharge path 230 by the pair of carry-in rollers 228. Then, the sheet sent to the discharge path 230 is conveyed by the pair of conveying rollers 231 to 234 to the last U-turn section 235.
The sheet is discharged by the U-turn roller 13 and the discharge roller 14 onto the intermediate tray 11 of the sheet re-feeding device described later with the image forming surface facing upward.

Next, the configuration of the sheet re-feeding apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3 and FIGS. In FIGS. 1 to 3, reference numeral 12 denotes a bottom plate on which sheets are stacked on an intermediate tray 11 serving as a storage unit, and a sheet on which an image is formed is stacked on one surface. 13 is U-turn roller, 14 is discharge roller, 15 is discharge roller
A pressing spring 15 presses the U-turn roller 13 and a pressing lever 15 is urged and supported by the lower guide 16 (see FIG. 4) counterclockwise.

Reference numeral 17 denotes a feeding roller as a re-feeding means for feeding the sheets stored in the intermediate tray 11 again to the image forming section. A reference side movable sheet guide 19 is swingably supported on a feed roller shaft 18 of the feed roller 17. The feed roller shaft 18 is an arm plate
It is rotatably supported by 20. Further, the arm plate 20 is swingably supported by the drive shaft 21.

In FIG. 1, reference numeral 22 denotes a timing belt for transmitting the rotation of the drive shaft 21 to the feed roller shaft 18, reference numeral 23 denotes a bearing for rotatably supporting the drive shaft 21, and reference numeral 24 denotes a rotatable U-turn roller 13. The supporting bearing, 25 is a front side plate, and 26 is a rear side plate. Further, reference numeral 27 denotes a U-turn guide, and reference numerals 28 and 29 denote coupling gears for transmitting the drive of the U-turn roller 13 to the drive shaft 21.

Reference numeral 30 denotes an arm solenoid serving as a contact / separation urging means for bringing the feed roller 17 into contact with / separating from the bottom plate 12 of the intermediate tray 11 or a sheet stacked on the bottom plate 12. Reference numeral 31 denotes an arm plate lever, and the arm plate 20
And fitted with the drive shaft 21. Reference numeral 32 denotes a return spring, which is engaged with the arm plate lever 31 and is an arm solenoid.
30 is pressed rightward in FIGS. 33 is pivotally connected to the arm solenoid 30 and has an arm plate lever.
Link that can swing with 31 and 34 arm plate lever
This is a link that swingably connects to 31.

Numeral 35 is a leading end abutting member as a first regulating member provided on the bottom plate 12, which abuts and regulates the end of the sheet stored in the intermediate tray 11 in the carrying direction. It is configured to be movable back and forth.
As shown in FIG. 6, the front end abutting member 35 has an L-shaped side surface, and an end of a bottom surface 35a is an inclined surface 35b, and a vertical groove provided at the lower surface of the bottom surface 35a at the center of the bottom plate 12 in the width direction. A protrusion 35c fitted so as to be slidable along 36 is provided.

Reference numeral 37 denotes a first moving urging means for moving the front end abutting member 35 back and forth along the vertical groove 36 in the transport direction. The first movement urging means 37 is provided with the projection 35c.
A rope 38 is stretched between pulleys 39 and 40 provided in the underfloor space corresponding to front and rear ends of the longitudinal groove 36, and one end of the rope 38 is wound around a driving pulley 41, and the like. The end is wound around the drive pulley 41 in the opposite direction to the one end by turning the tension adjustment pulley 42, and the drive pulley 41 is rotated forward and reverse to wind the rope end and rewind, so that it can be wound in the front-rear direction. It is configured so that it can be moved.

Reference numerals 43 and 44 denote side guides serving as second regulating members for performing alignment by contacting with and separating from end portions in the width direction orthogonal to the conveying direction of the sheets accommodated in the intermediate tray 11. It is configured to be movable left and right. As shown in FIG. 5, the side guides 43 and 44 are bent into an L-shape made of a plate material, and are formed on the lower surface of the horizontal portions 43a and 44a along lateral grooves 45 and 46 formed in the bottom plate 12 so as to be stepped in the width direction. Protrusions 43b and 44b fitted so as to be slidable are provided.
racks 43c, 44 with teeth arranged on the inner edge side on the lower surfaces of b, 44b
c, and the racks 43c, 44c are engaged with each other with a pinion 47 pivotally supported in the space under the floor of the bottom plate 12.

Numeral 48 denotes a second moving urging means for enlarging / reducing the side guides 43, 44 in the width direction.
The second moving urging means 48 is provided on both ends of a rope 50 wrapped around a pulley 49 fixed coaxially with the pinion 47 and a pulley for tension adjustment.
By rotating the drive pulley 53 in the opposite direction by rotating the drive pulley 53 and rotating the pinion 47 by rotating the drive pulley 53 in the normal and reverse directions, the width is increased through the racks 43c and 44c. It is configured to be able to move in the direction.

Numeral 54 designates a first movement urging means 37 of the tip abutting member 35 and a second movement urging means of the side guides 43 and 44.
48 is a drive source that is commonly connected, and is capable of normal and reverse rotation. Reference numeral 55 denotes switching means for switching the connection between the drive source 54 and the first movement urging means 37 or the second movement urging means 48. The switching means 55 can swing about a shaft 57a of a gear 57 meshed with a gear 56 fixed to the output shaft of the drive source 54 as shown in FIGS. The first lever 59 has a cam groove 60 in which a shaft 58a of the gear 58 is fitted.
The arm solenoid 30 of FIG. 2 and the spring member of FIG.
A second lever 63 swings around a support shaft 62 by the action of 61. That is, the arm solenoid 30 is turned off.
When the plunger 30a protrudes as shown in FIG. 2, the second lever 63 swings counterclockwise by the action of the spring member 61 as shown in FIG.
The gear 58 fitted on the shaft 60 via the shaft 58a is separated from the gear 65 meshed with the gear 64 fixed coaxially with the drive pulley 41 and fixed coaxially with the drive pulley 53 as shown in FIG. gear
It meshes with the gear 67 meshed with 66. On the other hand, when the arm solenoid 30 is turned on and the plunger 30a is pulled as shown in FIG. 3, the second lever 63 swings clockwise against the spring member 61 as shown in FIG. The gear 58 meshing with the shaft 60 via the shaft 58a swings together with the first lever 59 as shown by an arrow, and is fixed coaxially with the drive pulley 41.
The gear 65 meshes with the gear 65 meshed with the gear 64, and separates from the gear 67 meshed with the gear 66 fixed coaxially with the driving pulley 53.

Reference numeral 68 denotes a lever provided with a stopper 69 which engages with a gear 65 meshed with a gear 64 fixed coaxially with the driving pulley 41. The lever 68 is moved in a direction in which the stopper 69 is engaged by a spring member 70. Being energized. The stopper 69 prevents the tip abutment member 35 from moving due to the impact when the sheet abuts when the switching gear 58 is not meshed with the gear 65 as shown in FIG. In FIG. 6, reference numeral 71 denotes a microswitch for detecting that the front end contact member 35 has reached the most retracted position and turning off the power of the drive source 54, and is provided on the lower surface of the front end contact member 35. An actuator 71a is provided which comes into contact with the bulging portion 35d on the side surface of the projection.

In the sheet re-feeding device, the switching means 55 is switched by the arm solenoid 30,
The first movement urging means 37 of the drive source 54 and the front end abutting member 35 or the second movement urging means of the side guides 43 and 44
48 are configured to be selectively connected.

More specifically, the arm solenoid 30
When the feed roller 17 comes into contact with the sheets stacked and stored on the intermediate tray 11, the switching means 55 is switched by the arm solenoid 30, and the driving source 54 and the front end abutting member
When the feed roller 17 is separated from the sheet loaded on the intermediate tray 11 by the arm solenoid 30, the switching means 55 is switched by the arm solenoid 30 to switch the drive. The source 54 and the second moving biasing means 48 of the side guides 43 and 44 are configured to be connected.

Next, the operation of the sheet re-feeding apparatus according to this embodiment in the duplex mode will be described in detail.

First, during standby, as shown in FIG. 2, the arm solenoid 30 is turned off, and the return spring 32 is turned on.
Force causes the arm plate 20 to move through the arm plate lever 31 to the bottom plate.
It has been lifted from 12. Thus, the feed roller shaft 18 and the feed roller 17 are also lifted from the bottom plate 12 and are separated from each other. Since the feed roller shaft 18 is fitted to the arm plate 20 with a vertically long hole, equalization is possible, and when the arm plate 20 falls, the arm plate 20 is positioned at the center of the feed roller shaft 18. Feeding roller
17 can evenly contact the bottom plate 12 with a constant pressure. Thereby, the skew feeding at the time of sheet conveyance can be reduced.

When the arm solenoid 30 is in the OFF state, the reference movable sheet guide 19, which is swingably supported by the feed roller shaft 18, has a pressure lever as shown in FIG. 15 is urged clockwise around the feed roller shaft 18 around the feed roller shaft 18 so that the left end in the figure is raised,
In other words, the entirety of the reference-side movable sheet guide 19 is on standby while being separated from the bottom plate 12.

Further, since the arm solenoid 30 is OFF, as shown in FIG.
The gear 67 meshes with the gear 66 fixed coaxially with the gear 53. When the size of the sheet is designated by pressing the designation button at the time of copying, the drive source 54 rotates in a predetermined direction, and the rotation is transmitted to the drive pulley 53 via the gears 56, 57, 58, 67, 66, Wind or rewind one end or the other of 50. As a result, the pinion 47 rotates right or left, and the side guides 43, 44 are enlarged or reduced in the width direction according to the size of the sheet via the racks 43c, 44c, moved to a position slightly larger than the sheet size, and stopped. I do. In this case, it is preferable that the reference positions of the side guides 43 and 44 are determined, and the position from the reference position to the position of each size is controlled using a pulse signal.

After the side guides 43 and 44 move to a position slightly larger than the sheet size and stop as described above, the arm solenoid 30 is turned on as shown in FIG. When the arm solenoid 30 is turned on, the arm plate 20 of the arm plate lever 31 is turned on.
The arm plate 20 is rotated by its own weight in the clockwise direction about the drive shaft 21 and the feed roller 17 is
Contact 12 Then, as shown in FIG.
Gear meshed with a gear 64 fixed coaxially with the drive pulley 41
65, and the rotation of the drive source 54 is rotated by gears 56, 57, 58,
It is transmitted to the drive pulley 41 via 65 and 64, and one end or the other end of the rope 38 is wound or unwound. Thereby, the front end abutting member 35 moves forward or backward according to the size of the sheet, and stops after the movement.

When the start key is pressed in this state, the sheet is conveyed and the image formation of the sheet is started as described above, the arm solenoid 30 is turned off, and as shown in FIG. It is lifted from 12 (separated state).

In this state, the sheet having an image formed on one surface is discharged onto the bottom plate 12 of the intermediate tray 11 by the U-turn roller 13 and the discharge roller 14. At this time, the sheet is abutted against the stopped front end abutting member 35 and regulated, and is aligned in the transport direction. Thereafter, the side guides 43 and 44, which have been waiting at a position slightly wider than the sheet width while the arm solenoid 30 is turned off, move to the sheet width by the rotation of the driving source 54, and return to the position before the movement, and the sheet moves in the width direction. Is matched to Thereby, the sheet discharged onto the bottom plate 12 is aligned in the transport direction and the width direction.

Then, the sheets having an image formed on one surface are successively discharged onto the bottom plate 12 of the intermediate tray 11, so that the sheets on the bottom plate 12 are brought into contact with the front end butting member 35 and the side guides 43, 43. By 44, they are aligned in the transport direction and the width direction, respectively, and are stacked.

As described above, at the time of re-feeding the sheets stacked and stored on the bottom plate 12 of the intermediate tray 11, the arm solenoid 30 is turned on and the feed roller 17 comes into contact with the sheets on the bottom plate 12, and The feed roller 17 rotates clockwise in FIG. 3 to move the sheet to the U-turn roller 13 and the discharge roller 14.
Conveyed toward. Then, in order to ensure separation of the sheet by the U-turn roller 13 and the discharge roller 14, as shown in FIG. 2, the arm solenoid 30 is turned off and the feed roller 17 is separated from the sheet. Then, after only one sheet is conveyed by the U-turn roller 13 and the discharge roller 14, the arm solenoid 30 is turned on again, and the feed roller 17 contacts and conveys the next sheet. Repeat the above operation,
Refeeding is completed.

As described above, since the drive of the front end contact member 35 and the side guides 43 and 44 is switched by the solenoid 30 that moves the feed roller 17 up and down, the front end contact member 35 and the side guide 43 are switched. , 44 and the vertical movement of the feed roller 17 can be performed by one solenoid 30, and a small and inexpensive device can be realized.

When the feeding roller 17 is in contact with the sheet, the driving source 54 and the first moving urging means 37 of the front end abutting member 35 are connected, and the feeding roller 17 is separated from the sheet. Sometimes, the driving source 54 and the second moving biasing means 48 of the side guides 43 and 44 are connected, so that when the feeding roller 17 is in contact with the sheet, the driving source 54 supplies the side guides 43 and 44 to the sheet.
Since the drive transmission path to 44 is interrupted, the feed roller 17 does not come into contact with the sheet during the movement of the side guides 43, 44, and the sheet does not contact the sheet during the movement of the side guides 43, 44 due to malfunction or the like. Since the side guides 43 and 44 stop moving even when the feed roller 17 comes into contact, the problem that the sheet ends are broken or torn and jam after re-feeding can be solved. .

Second Embodiment An image forming apparatus provided with a sheet re-feeding device according to a second embodiment will be described in detail with reference to the drawings. Since the overall configuration of the image forming apparatus is the same as that of the above-described embodiment, a detailed description is omitted here. Hereinafter, the description will focus on the features of the present embodiment that are different from the above-described first embodiment.

9 to 11, reference numeral 80 denotes a feed roller shaft which supports the feed roller 17, and rotates together with the feed roller 17. Reference numeral 81 denotes a feeding arm, which is located in a cutout portion of the bottom plate 12 and lifts a sheet stacked on the bottom plate 12 from below to cause the sheet to abut / separate from the feeding roller 17. A feeding arm shaft 82 supports the feeding arm 81 in a swingable manner. 83 is an arm lever, which is a feeding arm
The feeding arm 81 is lifted by contacting the feeding arm 81. Reference numeral 84 denotes a link which transmits the force of the arm solenoid 30 to the arm lever 83. A link spring 85 transmits the force of the link 84 to the arm lever 83. 86 is a lever spring, and arm lever 83
Is urged rightward in the figure. Reference numeral 87 denotes a step screw, which is fitted into a long hole of the arm lever 83 and slidably supported. Reference numeral 12a denotes an arm lever base, which is integrally formed with the bottom plate 12, and fixes the step screw 87. Reference numerals 28, 88, 89, and 90 denote connecting gears that transmit the drive of the U-turn roller 13 to the feed roller shaft 80.

The other members have the same functions as those of the above-described embodiment, and therefore are denoted by the same reference numerals and description thereof will be omitted.

The operation of the sheet re-feeding apparatus according to this embodiment in the duplex mode will be described in detail.

First, at the time of standby, as shown in FIG. 10, the arm solenoid 30 is turned off, and the lever spring is turned off.
The arm lever 83 is moved rightward in the figure by the force of 86,
The feeding arm 81 that comes into contact with the feeding arm 81 is positioned below the bottom plate 12 (a state separated from the feeding roller 17). Further, similarly to the above-described embodiment, the arm solenoid 30 is
Since it is F, the drive source 54 is connected to the side guides 43 and 44. Then, when the sheet size designation button is pressed, the side guides 43 and 44 move to a position slightly wider than the sheet size and stop.

After the side guides 43 and 44 move to a position slightly larger than the sheet size and stop as described above, the arm solenoid 30 is turned on as shown in FIG. When the arm solenoid 30 is turned on, the link 84 is pulled leftward in the figure, and the arm lever 83 is pulled leftward in the figure via the link spring 85. As a result, the arm lever 83 moves the feed arm 81
Is rotated counterclockwise in the figure around the feed arm shaft 82, and the feed arm 81 contacts the feed roller 17.

The contact force in this case is determined by the link spring 85. Then, as in the first embodiment, in this state, the drive source 54 is connected to the front end butting member 35,
The leading end abutting member 35 stops after moving according to the size of the sheet.

When the start key is pressed in this state, the arm solenoid 30 is turned off, and as shown in FIG.
81 is lowered, and the feeding arm 81 is separated from the bottom plate 12. In this state, the sheet having an image formed on one side is moved by the U-turn roller 13 and the discharge roller 14 to the bottom plate.
Exhausted on 12. At this time, the sheet is abutted against the stopped front end abutting member 35 and regulated, and is aligned in the transport direction. Thereafter, the side guides 43 and 44, which have been waiting at a position slightly wider than the sheet width while the arm solenoid 30 is turned off, move to the sheet width by the rotation of the driving source 54, and return to the position before the movement, and the sheet moves in the width direction. Is matched to Thereby, the sheet discharged onto the bottom plate 12
It is aligned in the transport direction and the width direction. Thereafter, similarly to the first embodiment, the discharge of the sheet onto the bottom plate 12 and the alignment thereof are repeated and stacked.

When the sheet is re-fed, the arm solenoid 30 is turned on and the feeding arm 81 is lifted so that the sheet comes into contact with the feeding roller 17 and the feeding roller 17 is moved clockwise in FIG. The sheet is conveyed toward the U-turn roller 13 and the discharge roller 14 by rotating in the circumferential direction. Then, in order to ensure separation of the sheet by the U-turn roller 13 and the discharge roller 14, an arm solenoid 30 is provided.
Is turned off, the feed arm 81 is lowered, and the sheet is separated from the feed roller 17 as shown in FIG. Then, only one sheet U-turn roller 13 and discharge roller 14
, The arm solenoid 30 turns on again
Then, the sheet is brought into contact with the feeding roller 17 by the feeding arm 81, and the sheet is conveyed by the feeding roller 17. The above operation is repeated, and the re-feeding is completed.

As described above, since the drive of the front end contact member 35 and the side guides 43 and 44 is switched by the solenoid 30 which moves the feed arm 81 up and down, the front end contact member 35 and the side guide 43 are switched. , 44 and the vertical movement of the feed arm 81 can be performed by one solenoid 30, and a small and inexpensive device can be realized.

When the sheet is in contact with the feeding roller 17 by the feeding arm 81, the driving source 54 and the first moving urging means 37 of the front end abutting member 35 are connected.
When the sheet is separated from the feed roller 17 by 81, the driving source 54 and the second movement urging means of the side guides 43 and 44
When the side guides 43 and 44 are moving, the drive transmission path from the drive source 54 to the side guides 43 and 44 is cut off when the feed roller 17 is in contact with the sheet. The feeding roller 71 does not contact the sheet,
Even if the sheet and the feed roller 17 come into contact with each other while the side guides 43 and 44 are moving due to malfunction or the like, the side guides 4
Since the movements of the sheets 3 and 44 are stopped, the sheet ends may be broken or torn, and the problem of jamming after re-feeding can be solved.

[Other Embodiments] In the above embodiment,
Although a copying machine is exemplified as the image forming apparatus, the present invention is not limited to this, and may be another image forming apparatus such as a printer or a facsimile, for example. Similar effects can be obtained by applying the present invention to the device.

In the above-described embodiment, the electrophotographic method is exemplified, but the present invention is not limited to this, and another recording method such as an ink jet method may be used.

[0060]

As described above, according to the present invention,
The drive switching of the first regulating member and the second regulating member is performed by the contact / separation urging means for contacting / separating the re-feeding means from / to the sheet loaded in the accommodation part or the accommodation part. For example, a single solenoid as the contact / separation urging means can perform contact / separation between the sheet and the re-feeding means and drive switching between the first regulating member and the second regulating member. It becomes feasible.

When the sheet is in contact with the re-feeding means, the driving source and the first moving urging means of the first regulating member are connected, and the driving force transmitted from the driving source to the second regulating member is transmitted. Is interrupted, the re-feeding means does not come into contact with the sheet during the movement of the second regulating member, and the sheet comes into contact with the sheet during the movement of the second regulating member due to malfunction or the like. Even in this case, since the second regulating member stops moving, it is possible to solve the problem that the sheet edge is broken or broken, and the sheet jams after re-feeding.

[Brief description of the drawings]

FIG. 1 is a top view of a main part of a sheet refeeding device according to a first embodiment.

FIG. 2 is a sectional view of a main part of the sheet re-feeding device according to the first embodiment.

FIG. 3 is a sectional view of a main part of the sheet re-feeding device according to the first embodiment.

FIG. 4 is a schematic configuration diagram of an image forming apparatus including the sheet re-feeding device according to the first embodiment.

FIG. 5 is a top view of a main part showing a drive transmission path of a front end abutting member and a side guide.

FIG. 6 is a perspective view of a main part of a front end abutting member.

FIG. 7 is a top view of a main part showing a state of driving transmission to a side guide

FIG. 8 is a top view of a main part showing a state in which drive is transmitted to the front end abutting member.

FIG. 9 is a top view of a main part of the sheet re-feeding device according to the second embodiment.

FIG. 10 is a sectional view of a main part of a sheet re-feeding device according to a second embodiment.

FIG. 11 is a sectional view of a main part of a sheet re-feeding device according to a second embodiment.

FIG. 12 is an explanatory diagram of a conventional sheet re-feeding device.

FIG. 13 is an explanatory view of a conventional sheet re-feeding device.

FIG. 14 is an explanatory diagram of a conventional sheet re-feeding device.

[Explanation of symbols]

 S1, S2 ... Sheet 11 ... Intermediate tray 12 ... Bottom plate 12a ... Arm lever base 13 ... U-turn roller 14 ... Discharge roller 15 ... Pressing lever 16 ... Lower guide 17 ... Feed roller 18 ... Feed roller shaft 19 ... Reference side Movable seat guide 20 ... Arm plate 21 ... Drive shaft 22 ... Timing belt 23, 24 ... Bearing 25 ... Front plate 26 ... Rear plate 27 ... U-turn guide 28, 29 ... Connection gear 30 ... Arm solenoid 30a ... Plunger 31 ... Arm plate Lever 32 ... Spring 33, 34 ... Link 35 ... Tip abutting member 35a ... Bottom part 35b ... Inclined surface 35c ... Projection 35d ... Swelling part 36 ... Vertical groove 37 ... First movement urging means 38, 50 ... Rope 39, 40, 49 ... pulleys 41, 53 ... drive pulleys 42, 51, 52 ... tension adjustment pulleys 43, 44 ... side guides 43a, 44a ... horizontal parts 43b, 44b ... protrusions 43c, 44c ... racks 45, 46 ... lateral grooves 47 ... Pinion 48 ... Second movement urging means 54 ... Drive source 55 ... Switching means 56,57 ... Gear 57 a, 58a ... shaft 58 ... switching gear 59 ... lever 60 ... cam groove 61 ... spring member 63 ... lever 64, 65, 66, 67 ... gear 68 ... lever 69 ... stopper 70 ... spring member 71 ... micro switch 71a ... actuator 80 … Feed roller shaft 81… feed arm 82… feed arm shaft 83… arm lever 84… link 85… link spring 86… lever spring 87… step screw 88,89,90… connection gear 200… image forming devices 201,202 … Supply cassette 205… Supply roller 206… Separation roller pair 207, 208, 209… Conveyance roller pair 213… Registration roller pair 214… Photoconductor drum 215… Transfer charger 216… Transport belt 217… Fixing roller pair 218… Transport Roller pair 219… Discharge path 220… Discharge roller pair 221… Discharge tray 222… Flapper 223… Vertical path 224, 225… Convey roller pair 227… Convey path 228… Convey roller pair 230… Discharge path 231 to 234… Convey Roller pair 235… U-turn part

Claims (3)

[Claims] An accommodation section for stacking and accommodating a sheet having an image formed on one surface thereof, and a first regulation movable in a conveyance direction for abutting and regulating an end in a conveyance direction of the sheet accommodated in the accommodation section. A member, a second regulating member movable in the width direction for restricting by contacting with and separating from an end in the width direction orthogonal to the conveying direction of the sheet accommodated in the accommodating portion, and supplying the sheet accommodated in the accommodating portion again. Re-feeding means for feeding, first moving urging means for moving the first regulating member in the conveying direction, second moving urging means for moving the second regulating member in the width direction, and the first movement A drive source commonly connected to an urging unit and the second moving urging unit; a switching unit for switching a connection between the driving source and the first moving urging unit or the second moving urging unit; A sheet stacked and stored in the storage unit, and the re-feeding unit; Includes a contact and separation biasing means for abutting / spacing, wherein the switching means is switched by the contact and separation biasing means,
A sheet re-feeding device, wherein the drive source and the first movement urging means or the second movement urging means are selectively connected. 2. The switching unit is switched by the contact / separation urging unit when the reloading unit comes into contact with the storage unit or the sheets stacked and stored in the storage unit by the contact / separation urging unit. And the first movement urging means of the first regulating member are connected to each other, and when the accommodating portion or the sheet stacked and accommodated in the accommodating portion is separated from the re-feeding means by the contact / separating urging means, 2. The sheet re-feeding device according to claim 1, wherein the switching means is switched by the control so that the drive source and the second movement urging means of the second regulating member are connected. 3. An image forming apparatus capable of forming an image on both sides of a sheet, comprising the sheet re-feeding device according to claim 1 or 2.