JPH07237802A - Paper sheet matching device of paper reverse turn carrying device - Google Patents

Abstract

PURPOSE:To constitute a means for discharging while regulating paper sheets in relation to a guide member and prevent generation of any slant feed on the paper sheets to be reversely turned and discharged, in a paper sheet reverse turn carrying device arranged on the copy discharge part of an image formation device. CONSTITUTION:In a paper sheet reverse turn carrying device 10 arranged in the paper reverse turn part of an image formation device, a triroll device 11 is arranged in the entrance of a reverse turn tray 15 and a mechanism for sending out the paper sheets in a discharge direction through another paper sheet nip part of the triroll device after sending the paper sheets in the reverse turn tray is constituted. in the reverse turn roller device arranged on the reverse turn tray 15, a drive roller member 22 is installed so that the roller bodies 24, 24a... with mutually different diameters may be formed in a skewer shape in relation to a drive shaft 23 and the paper sheets are energized in a slant feeding state by the drive roller member in relation to a side surface guide member 16 arranged on the one side surface of the reverse turn roller device. The paper sheets are discharged while being positioned so that the one side surface of each paper sheet P maybe push-pressed to the side surface guide member so as to be regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing / conveying device in which a triroll device is arranged at the entrance of a reversing tray to reversely feed a sheet through the reversing tray and feeds the sheet. The present invention relates to a sheet aligning device of a sheet reversing / conveying device that regulates the position of a sheet to be sent out and can discharge the sheet while preventing the sheet from being obliquely fed.

[0002]

2. Description of the Related Art In an apparatus such as an electrophotographic copying machine or a laser beam printer, when an image is recorded on a sheet and discharged as a copy, the sheet is inverted by an inversion device. There is. Further, not only when ejecting the paper, but also when performing double-sided copying, it is necessary to invert and feed the paper toward copying on the back side. For that purpose, a reversing device is built in the paper transport path. There is a case. As the simplest device for reversing the sheet, for example, a device shown in Japanese Utility Model Laid-Open No. 63-37667 is used. The conventional reversing device is configured as shown in FIG. 5, in which the triroll device 11 is arranged at the inlet of the reversing tray 15 and the reversing roller device 20a is arranged in the middle of the reversing tray 15. The sheet reversing device 10a. In the triroll device 11, pinch roller members 13 and 14 are arranged above and below the drive roller member 12, and the drive roller member 12 is driven to drive the upper and lower pinch roller members 1.
A mechanism for rotating the rollers 3 and 14 is configured. Then, in the triroll device 11, the paper P fed by the carry-in roller 26 is nipped between the two roller members 12 and 14 of the triroll device 11, and the paper is conveyed toward the reversal tray 15.

Further, in the reversing roller device 20a arranged on the reversing tray 15, the driving roller member 22 and the pinch roller member 21 are arranged so as to be opposed to each other, but there is an allowance for paper to pass between the roller members. A part is formed so that the paper is rotated in the discharge direction. Further, the reversing roller device 20a does not affect the action of the paper which is sent to the reversing tray 15 through the triroll device toward the back side of the reversing tray. When the end portion has passed through the nip portion of the triroller 11 and the conveying force is not applied, the rotation of the drive roller member 22 urges the sheet in the ejecting direction to exert the conveying action in the sheet ejecting direction. A mechanism that can be used is configured. Therefore, since the sheet that has entered the inside of the reversing tray 15 is fed to the triroll device 11 by the reversing roller device 20a, the leading end portion of the sheet in the sheet discharging direction is between the driving roller member 12 and the pinch roller member 13. The sheet enters the sheet and is sent out toward the discharge roller 27 by the triroll device, and is sent out toward the discharge tray or the like in a state where the image surface of the discharged sheet is reversed.

The reversing roller device provided on the reversing tray may be configured as, for example, a corrugation roller device in order to provide a function of accurately feeding the paper in the discharge direction. By curving in a wavy shape, even when thin paper is used, the paper is prevented from buckling and stopping inside the reversing tray. The sheet reversing device 10a configured as described above is provided not only in the discharge section of the image forming apparatus but also in a device such as an automatic double-sided copying machine, a sheet prepared as a single-sided copy sheet is turned to a back side copy. It can be provided on a route for transporting. Further, by providing the sheet reversing device of the image forming apparatus as described above, it is possible to combine the roller device of the relatively simple mechanism with the tray and to use it when reversing and ejecting the copy. It is possible to simplify the configuration of the paper transport path of a copying machine or the like.

[0005]

However, in the reversing tray configured as shown in FIG. 5, the reversing roller device disposed inside the tray imparts a feeding action in a direction to oppose the triroll device. In addition, there is a problem that the paper that reciprocates inside the reversing tray does not move straight and tends to be inclined. In particular, in a device of the type in which there is a large gap between the pinch roller member and the drive roller member that form the reversing roller device, and the paper is conveyed in the discharge direction only by the friction between the drive roller member and the paper, in the paper width direction Since the conveyance force of the roller member with respect to is not constant, there arises a disadvantage that the discharged paper is sent out in an oblique state.

Therefore, in order to solve the above-mentioned problems, for example, as shown in Japanese Utility Model Laid-Open No. 3-56755, a plurality of guide members corresponding to the size of the sheet are arranged on the inner surface of the reversing tray. However, it is also possible to regulate the side surfaces on both sides in the sheet transport direction by guide members. Further, in the conventional example, a guide member corresponding to sheets of all sizes is arranged on one side surface of the reversing tray, and a plurality of guide members corresponding to sheet sizes are arranged on the other side surface. By the way, by controlling both sides of a sheet of arbitrary size, a means for preventing the sheet from being obliquely fed is configured. However, the provision of the regulating member as described above has a problem that the configuration of the reversing tray becomes complicated, and the guide member is not normally operated when the paper is curled in the width direction. There are also problems.

Further, in order to prevent the sheet from being obliquely fed, for example, as shown in JP-A-1-150669, a loop in the lengthwise direction is formed on the sheet inside the reversing tray. It is also conceivable that, when the leading end portion of the sheet is nipped by the triroll device, the position nipped by the roller member can be accurately set. However, when a loop is formed on the sheet to prevent the diagonal feeding, it is necessary to change the position of the stop member arranged on the reversing tray each time the size of the sheet changes, and the movement of the stop member is There is a problem that the mechanism provided for positioning becomes complicated.

[0008]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional sheet reversing device as described above. A reversing roller having a side guide member on one side of the reversing tray and arranged inside the reversing tray. By providing the device with a means for obliquely feeding the paper toward the side guide member, the device that can set the paper discharged from the paper reversing device to the side guide member is provided. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a triroll device for conveying a sheet is arranged at the entrance of a reversing tray,
The present invention relates to a device in which a reversing roller device that rotates in the discharging direction is arranged inside the reversing tray, and a sheet introduced into the reversing tray is sent out in a reversing state via another nip portion of the triroll device. In the present invention, the side guide member for regulating the sheet is arranged on one side of the reversing tray, and the sheet is slanted toward the side guide member with respect to the reversing roller device provided in the reversing tray. And a mechanism for performing an aligning action with respect to the sheet discharged from the reversing tray. Further, in the present invention, the reversing roller device is configured by arranging roller bodies having different diameters with respect to the shaft, and the roller body arranged on the shaft has a large diameter in the vicinity of the guide member. The diameter may be reduced as the distance from the guide member increases.

[0010]

In the sheet reversing / conveying apparatus of the present invention constructed as described above, the reversing roller device for urging the sheet in the discharging direction is provided corresponding to the upstream portion of the triroll device arranged at the inlet of the reversing tray. However, in the reversing roller device, the roller body is provided such that the diameter of the roller body is large on the side of the side surface guide member and small toward the other side.
When biasing the sheet in the discharge direction by the reversing roller device, an action of pressing one side surface of the sheet against the side surface guide member is added to prevent the sheet from being obliquely fed. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet aligning device for a sheet reversing / conveying device according to the present invention will be described with reference to the illustrated example. The example shown in FIG. 1 shows the configuration of the sheet reversing / conveying device 10 of the present invention. The triroll device 11 having the configuration as shown in FIG. A reversing roller device is arranged in the middle of the tray 15. The reversing tray 15 is configured as a device in which two guide plate members for guiding the upper and lower surfaces of the paper are arranged at a predetermined interval, and the paper is inserted into the gap between the upper and lower guide plates. A side guide member 16 is disposed on one side of the reversing tray 15 to press the side surface of the sheet against the side guide member 16 to regulate the side surface of the sheet. When the sheet reciprocates inside the reversing tray 15. In addition, the sheet is prevented from moving diagonally due to non-uniform contact with the roller body of the reversing roller device.

The drive roller member 22 constituting the reversing roller device is provided with roller bodies of different sizes on the drive shaft 23 in a skewered shape.
4a ..., the roller body 24 adjacent to the side guide member 16 has a large diameter, and the roller body 24c located on the other side of the reversing tray has a small diameter.
4b is configured to have a smaller diameter in order. The roller body may be made of rubber or the like, similar to the roller member used in the conventional paper reversing device, but in addition, a roller member made of metal or plastic may be used. is there. Then, the drive roller member 2
2 is constantly driven in the tray in the direction of feeding the paper toward the triroll device, and when the paper is inserted into the reversing tray 15 by the triroll device 11, the conveyance force of the triroll device 11 causes the reversing roller device. It overcomes the reaction force of the sheet and inserts the sheet into the reverse tray.

In the reversing tray 15, the sheet is completely entered into the inside of the reversing tray by the triroll device, and the action of the reversing roller device in the feeding direction is applied to the sheet P under the condition that the conveying force by the triroll device is not applied. Added. Then, the sheet comes into contact with the roller body that constitutes the drive roller member 22 in a state where the conveyance force is applied by the reversing roller device, and the sheet is directed toward the triroll device by the frictional force between the sheet and the roller body. The action of sending out is performed. When the sheet is sent out from the reversing tray by the drive roller member, the diameter of the roller body forming the drive roller member gives different conveying actions in the width direction of the sheet, and one of the sheets P The action of pressing the side surface toward the side surface guide member 16 is performed. That is, in the drive roller member 22, the roller body attached to the drive shaft 23 has a larger diameter in the roller body 24 adjacent to the side guide member 16, and the roller body 24a, which becomes larger as the roller body 24 moves away from the side guide member.
The diameter is gradually set to 24b ...

Further, in each of the roller bodies, the peripheral speed gradually decreases in accordance with the diameter thereof, so that the conveying force for the sheet is high at the position close to the side guide member and gradually becomes low in the width direction of the sheet. . Therefore, with respect to the sheet driven in the feeding direction by the drive roller member, the corner portion of the rear end portion of the sheet first comes into contact with the side guide member 16 to move the sheet in an oblique state, and gradually. The entire side surface of the sheet is brought into contact with the side guide member 16 so that the sheet is fed from the reversing tray toward the triroll device.

In order to perform the feeding action as described above, the reversing roller device can be configured as shown in FIG. In the reversing roller device 20 shown in FIG. 2, a plurality of roller members are arranged in a skewered shape around the pinch roller member 21 as a shaft, and the drive roller member 22 has a plurality of roller bodies 24 with respect to the drive shaft 23. ,
24a ... are provided in a skewered shape. The roller member of the pinch roller member 21 and the roller body of the drive roller member 22 which constitute the reversing roller device 20 are arranged so that the mounting positions of the roller members are displaced from each other. The roller member of the pinch roller member is arranged between the roller bodies.

Then, the paper P that enters between the pinch roller member 21 and the drive roller member 22 of the reversing roller device 20 is curved in a wavy shape in the width direction, and the stiffness of the paper in the length direction of the paper is strengthened. In this state, the reversing roller device receives the conveying action. Further, in the drive roller member 22, since the roller body arranged on the drive shaft 23 is configured to have a large diameter on the side close to the side surface guide member 16 and a small diameter as the distance from the side surface guide member decreases, the roller body is formed on a sheet. The curved portion that is closer to the side guide member is configured to have a larger curved portion. Therefore, the sheet P that is moved toward the side surface guide member 16 by being imparted with an oblique conveying action by the reversing roller device is buckled even if the side surface of the sheet P is pressed by the side surface guide member 16. It is made possible so that there is no problem such as a problem.

In addition to the example shown in FIG. 2, as the reversing roller device arranged in the reversing tray of the present invention, a corrugation roller device as shown in FIG. 3 can be constructed. In the drive roller member 22 shown in FIG. 3, the roller body attached to the drive shaft 23 in a skewered shape is configured as roller bodies 24A, 24B ... Having flanges on both sides. The roller member of the pinch roller member 21 is arranged so as to correspond to the roller body, and the roller member of the pinch roller member is inserted between the flanges of the roller body, so that the paper P is corrugated in the width direction. Form. Further, in the roller body shown in FIG. 3, as shown in FIG. 2, the roller bodies 24A, 24B, ... As shown in 1, when adding the action of feeding the paper toward the triroll device,
It is possible to exert the effect of obliquely feeding the side surface of the paper toward the side surface guide member.

Separately from each embodiment of the reversing roller device,
As the reversing roller device arranged in the reversing tray of the present invention, any roller body can be provided, and it is not always necessary to configure the reversing roller device as a roller device for imparting a corrugation effect to the paper. For example, the roller body of the driving roller member and the roller member of the pinch roller member are arranged so as to face each other, the roller member of the pinch roller member is supported by a short shaft, and a pressing spring or the like is provided for each shaft. Is also possible. Further, a mechanism for imparting the action of feeding the sheet by friction between the sheet and the roller body in a state where a gap through which the sheet can pass is formed between the roller member of the pinch roller member and the roller body of the drive roller member. May be used.

The sheet reversing / conveying apparatus 10 as shown in FIG. 1 is provided in the copy discharge section of the image forming apparatus 1 as shown in FIG. 4, and the sheet made as a copy is placed in the discharge tray. It is also possible to configure a device for reversing and discharging. In the image forming apparatus shown in FIG. 4, a branch portion 9 is arranged downstream of the fixing device 8 and a sheet discharged from the fixing device 8 is directly sent to the discharge roller 27 via the branch portion 9. The path and the path for inserting the sheet into the sheet reversing / conveying device 10 through the gate device 9a provided at the branching portion, reversing the sheet, and sending the sheet toward the discharge roller 27 can be arbitrarily selected. Then, when the sheet is discharged in a state of being inverted by the sheet reversing / conveying device 10, the sheet is inserted into the reversing tray 15 via the triroll device 11 arranged at the entrance portion of the reversing tray 15 of the sheet reversing / conveying device 10. Then, with the trailing edge of the sheet in the sheet feeding direction coming out of the nip position by the triroll device, the returning action by the reversing roller device 20 is applied. Then, the front end of the paper in the paper ejection direction (the rear end in the insertion direction) is
Since the sheet is regulated by the side guide member as it is nipped by the triroll device and the reversing roller device imparts an oblique feeding action toward the side guide member, one side surface of the sheet becomes the side guide member. In this state, the discharge roller 27 reversely discharges the discharge tray 27 so that the oblique feed state does not occur.

The image forming apparatus 1 shown in FIG.
In the same manner as in a device such as a general electrophotographic copying machine, the paper corresponding to the size of the original is sent out from the plurality of paper feed trays 2 and 2a arranged in the paper feed unit, and the paper is conveyed in the paper conveyance path 3. It Then, the sheet is aligned by the sheet aligning device 4 arranged immediately in front of the image transfer portion of the photoconductor drum 5, and the feeding action is imparted by the registration roller device at a speed synchronized with the rotation speed of the photoconductor drum. By the discharge, the toner image on the photoconductor drum 5 is transferred to the paper. The sheet on which the toner image is transferred is fixed by heat and pressure applied by the fixing device 8, and is conveyed in the discharge direction.
Direct ejection or reverse ejection is performed, and the sheet is conveyed toward the ejection tray.

Further, as shown in FIG. 4, the sheet reversing / conveying apparatus of the present invention is not used only for reversing and ejecting the sheet, but the sheet reversing / conveying apparatus of the present invention is used in an automatic double-sided copying machine for single-sided copying. It is also possible to configure a device that reverses the paper and feeds it toward the copy on the back side. When the sheet reversing / conveying device of the present invention is arranged on the path for returning the single-sided copy sheet of the automatic double-sided copying machine, the conveying path is arranged from the discharging section of the fixing device to the sheet conveying path 3. In that case, it is possible to dispose the sheet reversing / conveying device at an arbitrary position in the single-sided copy sheet conveying path. When the above-described sheet reversal conveyance device is provided in the reversal path of the single-sided copy sheet, the sheet reversed and fed out from the reversal tray is fed out along the reference line set by the side guide member, It is possible to easily carry out the carrying operation in the paper carrying path, and further, when carrying out the paper matching operation in the paper aligning apparatus, an extra burden is not imposed on the paper aligning apparatus.

[0022]

Since the sheet reversing / conveying apparatus of the present invention has the above-mentioned structure, the sheet is fed in the discharge direction in correspondence with the upstream portion of the triroll device arranged at the inlet of the reversing tray. By providing the biasing reversing roller device, it is possible to eject the paper in a state in which one side surface of the paper is regulated. Further, the sheet discharged from the reversing tray by the side guide member of the present invention is not obliquely fed, and the subsequent sheet conveying operation can be easily performed. Further, in the sheet reversing / conveying device of the present invention, since the roller member forming the side surface guide member can have the function of positioning with respect to the sheet only by disposing one having a different diameter, the structure of the reversing roller device is There is no particular complication, and the reversing unit of the image forming apparatus can be configured as in the case of the conventional paper reversing apparatus.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a sheet reversing / conveying device of the present invention.

FIG. 2 is a front view of a side guide member of the present invention.

FIG. 3 is a front view of another example of the side surface guide member of the present invention.

FIG. 4 is an explanatory diagram of an image forming apparatus to which the sheet reversing / conveying apparatus of the present invention can be applied.

FIG. 5 is an explanatory diagram of a conventional sheet reversing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 image forming apparatus, 8 fixing apparatus, 9 branching section, 10 sheet reversing / conveying apparatus, 11 triroll apparatus, 15 reversing tray, 16 side guide member, 20 reversing roller apparatus, 21 pinch roller member, 22 driving roller member, 24 roller body .

Claims (2)

[Claims] 1. A triroll device for conveying a sheet is arranged at the entrance of the reversing tray, and a reversing roller device rotating in the discharging direction is arranged inside the reversing tray to introduce a sheet into the reversing tray. In a device for feeding in a reversing state via another nip portion of a triroll device, in which a side guide member for regulating paper is arranged on one side of the reversing tray, and a reversing roller device provided in the reversing tray is provided. On the other hand, the sheet aligning device of the sheet reversing / conveying device, which is provided with means for obliquely moving the sheet toward the side surface guide member and performs an aligning action with respect to the sheet discharged from the reversing tray. 2. The reversing roller device is configured by arranging roller bodies having different diameters with respect to a shaft, and the roller body arranged on the shaft has a large diameter in the vicinity of the guide member. The sheet aligning device of the sheet reversing / conveying device according to claim 1, wherein the sheet aligning device has a smaller diameter as the distance from the sheet reversing device increases.