JPH0616284A - Sheet conveying roll device - Google Patents

Abstract

PURPOSE:To provide a mechanism for allowing the axial movement of a register roll device in a sheet adjusting device for an electronic copying machine or the like so as to move the roll device in the case of torsional reaction being generated to a sheet by sheet adjusting action to enable the release of the reaction. CONSTITUTION:In a preregister roll device 12 provided at a sheet adjusting device, a roll member 22 is disposed in relation to the driving shaft 21 of a driving roll member 20 through a linear bearing member 25, and lateral movement regulating members 30, 30a are disposed on both sides of the roll member 22. In a pinch roll member 40, both sides of a shaft 41 are supported on linear bearing members 45, 45a, and the roll member is moved axially using lateral movement regulating members 50, 50a. In the lateral movement regulating member, a spring is allowed to act only in the compressing direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electronic copying machine or the like, in which a aligning mechanism is arranged in a paper transporting path and a transporting roll of a device for adjusting the transporting position of the paper by the aligning mechanism. More particularly, the present invention relates to a roll member that constitutes a registration roll device by responding to a stress in a twisting direction applied to a sheet or a reaction force in the sheet width direction when the sheet is moved in the width direction and aligned. The present invention relates to a sheet conveying device that can move a sheet to eliminate the stress generated in the sheet.

[0002]

2. Description of the Related Art In an image forming apparatus using an electrophotographic system such as an electronic copying machine or a laser printer, a toner image formed on a photosensitive drum is transferred onto a sheet, and the sheet carrying the toner image is fixed. It constitutes a mechanism through which the image is fixed through the apparatus and the copy is discharged. In the image forming apparatus, the paper delivered from the paper feed unit in which a paper feed tray or the like is arranged is conveyed to the image transfer unit by the conveyance roll device arranged in the paper conveyance path. Then, the leading edge of the paper is positioned by the paper aligning device arranged immediately in front of the image transfer portion from the photoconductor drum, and the paper is fed in time with the toner image formed on the photoconductor drum. Then, the operation of transferring the toner image is performed.

In an image forming apparatus such as a general electronic copying machine,
The paper delivered from the paper feed tray or the like is transported while being nipped by a transport roll device or the like provided in the paper transport path. However, in the transport roll device disposed in the paper transport path, the shaft attachment position may not be set accurately, or the roll member made of rubber or the like may be slightly eccentric with respect to the shaft. There is a case where the nip pressure by the roll device is not constant in the width direction of the paper transport path. Then, when the sheet is conveyed while being nipped by the roll member as described above, the sheet may not be conveyed straight, and an oblique feed state may occur.

Therefore, a sheet aligning mechanism by a sheet aligning device is arranged immediately in front of the image transfer section, and the toner image transfer section from the photosensitive drum is set so as to move the sheet along the reference line. Is being done. The sheet aligning device arranged immediately in front of the image transfer portion has a member in which a registration roll device and a gate member are combined, arranged in front of the photosensitive drum, and an upstream part which is separated from the registration roll device by a predetermined distance. In addition, a pre-registration roll device is arranged. Then, the leading end of the sheet conveyed in the sheet conveying path is stopped by the gate member, and then a slight additional feeding action is given by the pre-registration roll device to form a sheet loop. By the force of the loop formed on the paper, while uniformly pressing the leading end of the paper against the gate member, the aligning action of the leading end of the paper, the paper sent toward the image transfer unit by the registration roll device, It is prevented that the state of oblique feeding is caused.

As described above, in order to align the sheets at the image transfer portion from the photosensitive drum, for example, Japanese Unexamined Patent Publication No.
It has been proposed to provide a sheet aligning device as shown in Japanese Patent No. 94275. The sheet aligning apparatus shown in the conventional example is configured as shown in FIG. 26. The sheet aligning apparatus 10 is configured by a registration roll device 11 and a pre-registration roll device 12, and the registration roll device 11 is used. The gate member 3 is arranged immediately before, and the gate member 3 is provided so as to be capable of appearing in and retracting from the sheet conveying path.
The registration roll device 11 uses a drive shaft 11a having a plurality of roll members 11b attached thereto, and the driven gear 18 and the lateral movement mechanism 15 are provided at one end of the drive shaft 11a.
And are arranged.

In the lateral movement mechanism 15, a driven gear member 16 provided on the shaft and a drive gear 17 provided on the main body of the apparatus.
And are combined so that the drive shaft can be moved in the direction of arrow y or in the opposite direction. In addition,
The driven gear member 16 provided on the drive shaft allows rotation of the drive shaft, but is provided via a mechanism for axially restraining the drive shaft. Further, a sensor Sr is arranged at the other end of the drive shaft, and the sensor Sr is used to regulate the movement position of the drive shaft. The resist roll device 11 is moved laterally in the state of nipping. The pre-registration roll device 12 arranged on the upstream side of the registration roll device 11 is configured by attaching a plurality of roll members 12b to a shaft 12a.

In the sheet aligning apparatus 10 shown in FIG. 26, when a sheet is conveyed in a state of being obliquely fed or out of the reference line K of the sheet conveying path, the state is detected by the sheet sensor Sp. The detection is performed, and the lateral movement operation is performed on the registration roll device 11 according to the detection information. For example, as shown in the figure, when the sheet is conveyed at a position deviating from the reference line K, the leading end portion Pa of the sheet is locked by the gate member 3. Then, the pre-registration roll device 12 performs an additional feeding action on the sheet to form a sheet loop. Next, the gate member 3 is released, the leading end of the paper is nipped by the registration roll device 11, and the leading end of the paper is stopped at the position indicated by Pb, and then the registration roll device 11 is moved by the lateral movement mechanism 15. The sheet is laterally moved to the position where the side portion of the sheet is detected by the sheet sensor Sp, and the sheet aligning action is performed.

As described above, after performing the aligning action on the sheet, the sheet is fed from the sheet aligning unit in a state where the timing of sending the sheet is matched with the toner image formed on the photosensitive drum. Try to send it out. Therefore, the sheet sent out from the sheet aligning device is positioned with its side portion along the reference line K, so that the toner image transferred to the sheet is formed in a state in which the sheet is not displaced. To be done.

[0009]

However, as described above, when the sheet aligning device is configured by combining the axially movable registration roll device and the pre-registration roll device arranged at the fixed position, The paper laterally moved by the registration roll device is sent out with a reaction force in the twisting direction between the paper and the pre-registration roll device that holds the paper at the fixed position. When the lateral movement distance by the registration roll device is long, a large amount of stress is applied in the twisting direction of the sheet, and thus wrinkles or the like may be formed on the sheet.

Further, from the state where the sheet is nipped between the registration roll device and the pre-registration roll device,
After the sheet has passed through the nip portion of the pre-registration roll device, the sheet is fed only by the registration roll device. In that state, the reaction force in the width direction of the sheet changes, so that the sheet moves in the lateral direction, and an image shift may occur in the middle part of the transferred toner image.

Therefore, in order to solve the above-mentioned problem, for example, as shown in FIG. 27, a mechanism for allowing the pre-registration roll device 12 to move in the width direction of the sheet conveying path is arranged. It is suggested to do so. Then, when the paper is laterally moved by the registration roll device, the springs 13 and 1 arranged on both sides of the pre-registration roll device follow the reaction force in the twisting direction of the paper.
3a expands and contracts so that the reaction force in the twisting direction with respect to the paper can be released. However, the springs 13 and 13a are expanded and contracted each time the sheet is aligned, and the springs deteriorate as the number of expansions and contractions increases. Therefore, there is a problem in that the function of returning the pre-resist roll device to its original position cannot be favorably performed during long-term use of the device.

The sheet aligning device as shown in FIG. 26 is arranged corresponding to the toner image transfer portion from the photosensitive drum. In addition, in the color electronic copying machine, the sheet is set on the transfer drum. Even when the sheet aligning device is arranged in the feeding portion, there is a problem that a reaction force in the twisting direction is generated on the sheet. For example, JP-A-2-238480
In the color electronic copying machine disclosed in Japanese Unexamined Patent Application Publication No. 2003-242242, the photosensitive drum is arranged with respect to the transfer drum that holds the paper,
A plurality of color developing devices are arranged on the photosensitive drum. Then, a method is used in which the color toner images formed on the photoconductor drum are sequentially superimposed and transferred onto the paper held on the transfer drum.

In order to feed the sheet toward the transfer drum, a sheet aligning device as shown in FIG. 28 is arranged. The sheet aligning device, like that shown in FIG. 26, is a combination of a registration roll device 11 and a pre-registration roll device 12, and forms a loop on the paper P to align the leading end of the paper. After that, a mechanism for sending out toward the transfer drum is used. However, in the example shown in FIG. 28, when the sheets are aligned and fed, the sheet P may be given a stress in the direction of the arrow F in the twisting direction.

When the sheet is fed by the two roll devices, the sheet is pressed by the transfer drum 5 with a deviation from the reference line K, so that it serves as a sheet holding member for the transfer drum. A force that deforms the film member arranged is applied. After that, when the trailing edge of the paper leaves the nip position of the pre-registration roll device, the force for deforming the film member by the paper is released, and the reaction force of the film causes the paper position to shift in the reference line direction. The problem occurs. In the color electronic copying machine, when the operation of transferring the color toner image is started while the paper is being supplied to the transfer drum, the position of the paper is changed in the middle of the color toner image of the first color. A lateral shift may occur, which causes a problem that image quality deteriorates.

As described above, the skew state and the twisting force generated on the sheet are as shown in FIGS. 29 and 30, and for example, as shown in the graph of FIG. There is a correlation between the skew in (1), the state of skew after alignment, and the size of the loop of the sheet formed by the sheet aligning device. In the graph of FIG. 29, the vertical axis represents the skew after alignment, and the horizontal axis represents the skew in the transport unit. The curve a-1 shows the case where the loop amount in the sheet aligning device is set to 5 mm, Curves a-2 and a-3
Shows the cases where the loop amount is 15 mm and 25 mm, respectively. As can be seen from FIG. 29, when forming a large loop, it is recognized that the skew of the sheet after alignment has a small value even when the skew in the transport section has a large value. However, as the alignment interval in the paper aligning device increases, there is a problem that the twisting force generated in the paper becomes a very large value, as shown in the graph of FIG. In the graph of FIG. 30, the curve b-1 shows the case where the loop size is 5 mm, and the curves b-2 and b-3 show the case where the loop size is 15 mm and 25 mm, respectively. The axis shows the twisting force generated in the paper, and the horizontal axis shows the amount of twist. As shown in the graph of FIG. 30, after the skew of the sheet is corrected by the sheet aligning apparatus, the reaction force of the sheet is changed according to the skew correction action of the sheet depending on the magnitude of the twist of the sheet after the correction. It was found that the (twisting force) had a very large value. Therefore, when the sheet aligning action is performed by using the apparatus as shown in FIG. 26, the twisting action that occurs in the sheet occurs between the roller members before and after the sheet aligning device is arranged. , The paper may be bent.

In order to deal with the above-mentioned problems,
For example, as shown in FIG. 27, it is also an effective method to configure the upstream pre-registration roll device so as to be movable in the axial direction and release the force in the twisting direction generated on the paper. However, as described above, even when the pre-registration roll device is provided with the means for allowing the movement in the axial direction, the reaction force in the twisting direction generated in the sheet is A3 size sheet,
It has been found that the twisting force is about 1 kg even if the amount of skew newly generated after skew correction is about 0.5 mm. Therefore, since a very large value of force is applied to the spring that supports the roller member of the pre-registration roll device, the durability of the spring is also greatly affected, and the mechanism shown in FIG. The problem of not being able to be hired remains.

[0017]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional sheet aligning apparatus as described above, and when the sheet aligning operation is performed in the sheet aligning apparatus, the reaction force in the twisting direction of the sheet causes By providing a mechanism that moves the roll device in the width direction, and also by providing a pre-registration roll device that is rotatable via a vertical axis, the force in the twisting direction generated on the paper by the skew correction action of the paper aligning device is eliminated. It is an object of the present invention to provide a device that prevents the paper sent from the paper aligning device from moving in the width direction on the way by using the means.

[0018]

SUMMARY OF THE INVENTION According to the present invention, a driving roll member and a pinch roll member are arranged so as to face each other, and a constant nip pressure is set between the two rolls. The present invention relates to a conveyance roll device that conveys a sheet while nipping it. In the paper transporting roll device of the present invention, each roll member of the drive roll member and the pinch roll member is arranged with a mechanism that allows movement in the axial direction, and with respect to the roll member, on both sides thereof. As a method of moving the paper in the width direction of the paper transport path by disposing the urging mechanism, a mechanism for moving the paper in the lateral direction while nipping the paper is provided as a method of moving the paper in the width direction of the paper transport path.

Further, the drive roll member and the pinch roll member constituting the transport roll device of the present invention are provided with lateral movement regulating members provided with springs on both sides of the roll member, and the lateral movement regulating member is provided with respect to the spring. A mechanism for restricting the direction in which the roll member extends is configured to receive a force in the compression direction, and in the drive roll member and the pinch roll member, after the force for moving the roll member is canceled,
A mechanism for automatically returning to the original position is provided by the lateral movement restricting members on both sides of the roll member.

Further, in the present invention, the drive roll member and the pinch roll member which constitute the above-mentioned transport roll device are:
A roll member is fixedly provided to the shaft member, and the shaft member is provided so as to be slidable in the axial direction by a linear bearing member provided on the main body frame, and is laterally moved between the shaft supporting portion of the main body frame and the roll member. A force for moving the roll member in the drive roll member and the pinch roll member is provided by arranging a regulating member and receiving a force in the compression direction against the lateral movement regulating member, but arranging means for regulating the extending direction. It is possible to configure a mechanism that is automatically returned to the original position by the lateral movement restricting members on both sides of the roll member after the above is eliminated.

In addition to the above structure, the driving roll member and the pinch roll member which constitute the transport roll device of the present invention are provided with the roll member at a fixed position with respect to the shaft member, and slide in the axial direction via the linear bearing member. The spring receiving member is movably provided, and the spring receiving members are arranged at positions on both sides of the roll member, and means for restricting the amount of axial movement of the spring receiving member is provided, and the spring receiving member and the body frame are provided. A lateral movement restricting member is arranged between the shaft supporting member, and the driving roll member and the pinch roll member, after the force for moving the roll member is canceled, by the lateral movement restricting members on both sides of the roll member. , It is possible to configure a mechanism that automatically returns to the original position.

In the apparatus having the above-mentioned structure, an aligning mechanism including a registration roll device, a pre-registration roll device, and a gate member is arranged with respect to the sheet conveyance path of the image forming apparatus, and the leading end of the sheet is registered in the registration roll. It is also possible to apply the present invention to a sheet aligning device that performs a function of moving the registration roll device in the width direction in a state of being nipped by the device and sends out the sheet along a reference line. In that case, each of the roll members of the driving roll member and the pinch roll member that configure the pre-registration roll device, while arranging a mechanism that allows movement in the axial direction,
A lateral movement regulating member is arranged on both sides of the roll member, and the action of the registration roll device to move the paper in the width direction of the paper transport path is caused by the stress in the width direction applied to the pre-registration roll device. It is possible to configure a mechanism for automatically returning the roll member to the original position by means of the lateral movement restricting member after the roll device constituting the above-mentioned mechanism moves the paper in the lateral direction while nipping the paper and sends out the paper.

Further, according to the present invention, a sheet is held on a transfer drum, and a color toner image transfer device is arranged corresponding to the transfer drum, and a color toner image is superposed and transferred to a device. An alignment mechanism including a registration roll device, a pre-registration roll device, and a gate member is arranged in a portion that supplies the paper to the transfer drum, and the position of the paper is aligned between the registration roll device and the pre-registration roll device. The roll device of the present invention can also be applied to a paper aligning device that drives the registration roll device to feed the paper toward the transfer drum. Then, with respect to the device, each roll member of the drive roll member and the pinch roll member that configure the registration roll device, a mechanism for allowing movement in the axial direction is arranged, and with respect to the roll member,
A lateral movement regulating member is arranged on both sides of the paper, and the reaction in the twisting direction that occurs on the paper causes the roll device that constitutes the registration roll device to move the paper laterally while nipping the paper to release the reaction force. Therefore, it is possible to configure a mechanism for automatically returning the roll member to the original position by the lateral movement restricting member after the paper is sent out from the registration roll device.

In addition to the above-described embodiment, the present invention is a sheet aligning device configured by a registration roll device and a pre-registration roll device upstream of a transfer position of a toner image of an image forming apparatus to perform a sheet alignment operation. And aligning the position of the paper between the registration roll device and the pre-registration roll device, the registration roll device is driven to feed the paper from the photosensitive drum toward the image transfer unit. It can also be applied to a device.

In the image forming apparatus, each of the driving roll member and the pinch roll member constituting the registration roll device is provided with a mechanism for allowing the roll member to move in the axial direction, and On the other hand, the lateral movement restricting members are arranged on both sides of the sheet, and when the sheets are aligned, the roll device that constitutes the registration roll device moves the sheet in the lateral direction while nipping the sheet due to the reaction in the twisting direction that occurs in the sheet. It is possible to configure a mechanism for automatically returning the roll member to the original position by the lateral movement restricting member after the action of releasing the reaction force is performed and the paper is sent out from the registration roll device.

Further, in the present invention, a mechanism for allowing the drive roll member constituting the registration roll device to move in the axial direction is arranged, and lateral movement restricting members are arranged on both sides of the roll member. In the pre-registration roll device arranged upstream of the registration roll device, a roll frame is rotatably provided with respect to the main body frame via a vertical axis, and an adjusting member is arranged between the main body frame and the roll frame. However, due to the reaction in the twisting direction that occurs on the sheets at the time of aligning the sheets, the roll device that constitutes the registration roll device forms a mechanism that moves the sheets laterally while releasing the reaction force while nipping the sheets. The reaction force in the twisting direction of the aligned sheets causes the pre-registration roll device to move in the direction to rotate through the vertical axis, and After sending out the paper from the coupling device,
It is also possible to configure a mechanism that automatically returns the resist roll device and the pre-resist roll device to the reference position.

Further, in the present invention, the roll member of the resist roll device is configured to be movable in the axial direction, and the roll device that constitutes the resist roll device and the roll member that constitutes the pre-registration roll device form the paper. While nipped, it moves laterally to release the reaction force, and the reaction force in the twisting direction of the aligned sheets moves the pre-registration roll device in the direction to rotate it through the vertical axis. It is also possible to configure a mechanism that automatically returns the registration roll device and the pre-registration roll device to the original positions after the sheet is fed out from the registration roll device by giving the function of causing the registration roll device.

As described above, a mechanism for moving the roll member in the direction of releasing the reaction force of the sheet is applied to the portion which receives the reaction force of the sheet in the width direction with respect to the roll device constituting the sheet conveying device. By providing the sheet, it becomes possible to cancel the action in the twisting direction on the sheet when the sheets are aligned. Then, the roll device is moved in the width direction of the sheet conveying path, so that the sheet can be prevented from wrinkling, and the sheet conveying operation can be performed in a good state. Further, in the lateral movement restricting members arranged on both sides of the roll member of the present invention, a mechanism for imparting an action of compressing the spring member by a short interval is configured, and the spring member is not acted in the extending direction. It is possible to maintain good durability of the.
The lateral movement restricting member can accurately exert the action of centering the roll member and the action of guiding the paper by the roll device in a good state.

Further, in the present invention, the pre-registration roll device is provided so as to be rotatable with respect to the registration roll device movable in the width direction of the paper conveyance path via the support shaft arranged at the center of the paper conveyance path. When combining and
The configuration of the pre-registration roll device can be simplified, and the aligning action with respect to the paper can be easily exhibited. Further, when the roller member of the pre-registration roll device is provided slidably with respect to the support shaft, the reaction force in the twisting direction that remains on the sheet after skew correction can be easily eliminated, and It is also possible to prevent further skew from occurring on the sheet conveyed toward the side.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sheet conveying roll device according to the present invention will be described with reference to the illustrated example. The example shown in FIG. 1 is similar to the conventional sheet aligning apparatus 10 shown in FIG.
Resist roll device 11 and pre-resist roll device 12
And the resist roll device 1 are arranged at a predetermined interval.
The gate member 3 is arranged immediately before the position 1, and the gate member 3 is provided so as to be retractable from the paper conveyance path. Further, the registration roll device 11 has a drive shaft 11
Using a roll member 11b attached to a,
A driven gear 18 and a lateral movement mechanism 15 are arranged at one end of the drive shaft 11a.

In the lateral movement mechanism 15, a driven gear member 16 provided on the shaft and a drive gear 17 provided on the main body of the apparatus.
And are combined so that the drive shaft can be moved in the direction of arrow y or in the opposite direction. In addition,
The driven gear member 16 provided on the drive shaft is provided via a mechanism that allows rotation of the drive shaft but is constrained in the axial direction with respect to the drive shaft. A mechanism that can move the device 11 in the width direction of the paper transport path is configured.

A sensor S is attached to the other end of the drive shaft.
r is provided and the sensor is used to regulate the moving position of the drive shaft. When aligning the sheets, the registration roll device 11 is moved laterally while nipping the leading edge of the sheets, and the sheet feeding operation is performed while the side portions Pe of the sheets are aligned with the reference line K. When the trailing edge of the sheet has finished passing, the registration roll device 11 is returned to the position set by the sensor Sr and is used for waiting.

The pre-registration roll device 12 arranged upstream of the registration roll device 11 has lateral movement restricting members 30 on both sides of the roll member, as will be described in detail in accordance with the examples shown in FIG. 30a is arranged. Then, by the lateral movement restricting member, when a reaction force in the width direction of the paper is generated, by moving the pre-registration roll device in the width direction of the paper conveyance path to exert the action of eliminating the reaction force, When the paper is twisted between the registration roll device and the pre-registration roll device, the reaction force can be canceled. Also, when the trailing edge of the paper has finished passing through the nip portion of the pre-registration roll device, the reaction force due to the paper is canceled, so that the biasing member provided on the lateral movement regulating member causes the roll member to return to its original position. It is configured so that it can be automatically returned to the position.

In the sheet aligning device 10 shown in FIG. 1, when the sheet is conveyed in a state of being obliquely fed or out of the reference line K of the sheet conveying path, the state is detected by the sheet sensor Sp. The detection is performed, and the lateral movement operation is performed on the registration roll device 11 according to the detection information. For example, as shown in the figure, when the sheet is conveyed at a position deviating from the reference line K, the leading end portion Pa of the sheet is locked by the gate member 3. Then, the pre-registration roll device 12 performs an additional feeding action on the sheet to form a sheet loop. Next, the gate member 3 is released, the leading end of the paper is nipped by the registration roll device 11, and the leading end of the paper is stopped at the position indicated by the reference symbol Pb. Then, the registration roll device 11 is moved laterally 15 Then, the side portion of the sheet is moved to a position detected by the sheet sensor Sp so that the sheet aligns.

As described above, when performing the aligning action with respect to the paper, the leading end of the paper is laterally moved while being nipped by the registration roll device 11, so that the pre-registration roll device 12 is moved between them. It will be in a state of being subjected to a twisting action. Therefore, in the sheet aligning device of the present invention, the reaction force in the twisting direction generated on the sheet between the front and rear roll devices moves the pre-registration roll device 12 in the axial direction to eliminate the twist of the sheet. It is configured to be able to feed paper for the process.

In the present invention, a mechanism for allowing the pre-registration roll device to move in the axial direction is shown in FIG.
Can be configured as shown in. The pre-registration roll device 12 shown in FIG. 2 is shown by a reference numeral different from that in the case of FIG. 1, but the drive roll member 20 and the pinch roll member 40 are arranged so as to face each other, and between the both rolls. A mechanism for feeding a paper while nipping the paper by setting a predetermined nip pressure is configured. In the paper aligning apparatus, the drive roll member 20 is a drive shaft provided with a drive shaft 21 connected to a drive mechanism (not shown). The roll member 22 is supported by linear bearing members 25 and 25a. The driving force is transmitted while the pin member 23 for use is engaged with the elongated hole 24 provided in the roll member 22. Further, lateral movement restricting members 30 and 30a are arranged on both sides of the roll member 22 to perform an action of returning the roll member to the original position when the reaction force against the roll member is eliminated. .

The pinch roll member 40 arranged so as to face the drive roll member 20 is provided with a roll member 42 fixed to a shaft 41.
9a, the shaft 41 is attached to the linear bearing members 45, 4
The shaft 41 is supported via the shaft 5a, and the shaft 41 is allowed to move in the axial direction together with the roll member. The linear bearing member 4 is provided on both sides of the roll member 42.
Lateral movement restricting members 50 and 50a are arranged between the roll members 42 and 5 and 45a, respectively, and after the roll member 42 is axially moved by the reaction force of the paper, the roll member 42 returns to its original position. To do so.

When the pre-registration roll device 12 shown in FIG. 2 is moved in the axial direction by the reaction force of the paper, the position of each roll member becomes as shown in FIG. FIG. 3
When the roll member is moved in the arrow y direction by the reaction force of the sheet with the sheet nipped between the roll members 22 and 42 as shown in FIG. Is compressed, but the other lateral movement restricting member remains held while being separated from the roll member. That is, the spring provided on the lateral movement restricting member of the present invention is provided in a state where it receives a compressing action, but receives a restricting action in the extending direction.

As described above, in the present invention, the driving roll member 20 is provided with the drive roll member 20 in order to prevent the spring from being excessively expanded and contracted even when the roll member is moved in the axial direction. 7 and the pinch roll member 40 is configured as shown in FIGS.

First, the drive roll member 20 of the present invention will be described with reference to FIGS. In the example shown in FIG. 4, the roll member 22 is supported via the linear bearing member 25 with respect to the drive shaft 21 of the drive roll member 20, and the roll member 22 is allowed to move in the axial direction with respect to the drive shaft 21. It constitutes the mechanism to do. As shown in FIG. 2, a drive transmission mechanism including a pin and an elongated hole is provided between the drive shaft 21 and the roll member 22, so that the roll member 22 is driven by the drive shaft 21 and the roll member 22 is rolled. It is provided so that the driving force can be transmitted even when the member 22 moves in the axial direction.

In the drive roll member 20, a bearing 26 is arranged to support the drive shaft on the main body frame 9,
The spring receiving member 32 arranged at the end of the roll member 22 and the spring 31 provided between both members constitute the lateral movement restricting member 30. The lateral movement regulating member 30 keeps the position of the roll member constant, and even when the roll member is moved in the axial direction by the reaction force of the paper, it exerts the action of returning the roll member to the original position. It constitutes the mechanism to obtain. The spring receiving member 32 is configured as a hollow, substantially cylindrical member, and the locking member 34 is housed in the hollow portion. A member such as an E-ring can be used as the locking member 34, which is fixedly provided on the shaft 21 and is used to regulate the moving distance between the spring receiving member 32 and the roll member 22.

In contrast to the member arranged at one end of the drive roll member 20 shown in FIG. 4, a mechanism as shown in FIG. 5 is arranged at the other end of the drive roll member. In the example shown in FIG. 5, the mechanisms of FIG. 4 are arranged symmetrically, and a bearing 26a provided on the main body frame 9a and a spring receiving member 32a arranged on the other side of the roll member 22 are provided. A spring 31a is arranged between the two. In addition, a locking member 34a provided on the shaft 21 is arranged with respect to the spring receiving member 32a to configure a mechanism that regulates the moving distance between the spring receiving member 32a and the roll member 22.

As shown in FIGS. 4 and 5, in the drive roll member of the present invention, the drive shaft 21 and the roll member 2 are used.
The linear bearing members 25 and 25a are arranged between the roll member 22 and the roller bearing 2, and the roll member 22 can be moved in the axial direction. Further, by disposing the locking members 34 and 34a on both sides of the roll member 22, even when the roll member is moved in the axial direction, the distance the roll member is moved is set to the distance L shown in the figure. It can be restricted to a range. Further, as shown in FIG. 6, when the roll member is moved to the left side, the roll member 22 moves, but in the lateral movement restricting member 30a on the side where the spring is extended,
Since the spring receiving member 32a is restricted by the locking member 34, the spring 31a does not extend excessively. On the other hand, on the side where the compression action is applied to the spring, the compression action is given by the interval L shown in FIG. 5, but the compression interval is set small.

The pinch roll member 40 arranged so as to face the drive roll member 20 is provided by fixing the roll member 42 to the shaft 41, as shown in FIGS. , 9a, the shaft 41 is supported via linear bearing members 45, 45a. Each member shown in FIG.
The pinch roll member 40 of the present invention according to FIG.
Will be explained. As shown in FIG. 7, a linear bearing member 45 is arranged on the main body frame 9 via a bearing holding member 46, and a lateral movement restricting member 50 is provided between the linear bearing member 45 and the roll member 42. It is arranged. The lateral movement restricting member 50 includes a spring receiving member 52 arranged on the bearing side, a bracket member 55 arranged on the side of the roll member 42, and a spring 51 supported between both members. It

In the lateral movement restricting member 50, a spring receiving member 52 configured as a hollow, substantially cylindrical member is arranged inside the linear bearing member 45, and is engaged with the hollow portion of the spring receiving member 52. A stopper member 54 is arranged, and the locking member 54 is provided by fixing a member such as an E ring to the shaft 41. Then, the movement interval of the shaft is regulated to L so that the movement distance of the shaft 41 is regulated and the extension of the spring provided in the lateral movement regulation member is limited. The spring receiving member 52 arranged on the side of the roll member uses a material having a small friction coefficient with respect to the shaft and the roll, and is made of a plastic material having a small friction coefficient. Further, in the configuration of the other end portion of the pinch roll member shown in FIG. 8, each member is arranged symmetrically with that shown in FIG. 7, and a is given to the reference numeral of each member in FIG. Is shown.

In the pinch roll member 40 constructed as described above, when a force for moving the roll member in the axial direction is applied by the paper, a compression action is applied to one lateral movement restricting member, A force is applied to the other lateral movement restricting member in the extending direction. For example, when a force is applied to the roll member 42 in the left direction in FIG. 9,
The shaft 41 of the roll member 42 has a linear bearing member 45.
It slides with respect to the lateral movement restricting member 50 and is moved in a direction of compressing the spring 51. And the axis 4
The movement range of 1 is set to the movable range of the locking member 54 (range of the interval L in FIG. 7). Therefore, even when the roll member is moved by the maximum distance, the lateral movement restricting member exerts the compression action on the spring in the state of being moved in the direction of the arrow y by the distance L in FIG.

When the shaft 41 is moved in the state shown in FIG. 9, at the other end of the shaft, as shown in FIG.
The lateral movement restricting member 50a is moved in the arrow y direction. However, in the lateral movement restricting member 50a, the locking member 54a provided on the shaft 41 performs an action of moving the spring receiving member 52a in the axial direction, so that the lateral movement restricting member 50a moves with respect to the spring 51a. It is moved together with the shaft 41 without giving an extra stretching action, and a state is formed in which a gap is formed between the linear bearing member 45a.

Therefore, in the roll device of the present invention, the length of the spring of the lateral movement restricting member changes between the steady length L1 shown in FIG. 8 and the length L1 when moved as shown in FIG. And the effect of extra elongation is not given. Then, as shown in FIG. 9, a state in which the compression action of the distance L is applied only to the compression side spring 51 is set. Further, as described above, by applying a force to the spring arranged in the lateral movement restricting member only in the compression direction and setting the compression amount of the spring to be extremely short, the spring is added to the spring. Due to the expansion and contraction action, it is possible to prevent the characteristics of the spring from changing, and the return action of the roll member can be satisfactorily exhibited.

[0049]

[Embodiment 2] Another Embodiment of Roll Mechanism In the above-mentioned example of the pre-registration roll device of the present invention, the structure in which the driving roll member and the pinch roll member are different is shown. In the roll device of Figure 1,
As shown in FIG. 1, the drive roll member and the pinch roll member can have the same mechanism. In the pre-registration roll device 12 shown in FIG. 11, the drive roll member 20 has a plurality of roll members 22 ... Attached to the drive shaft 21 in a skewered manner. And a large number of roll members 42 ... Are provided in a skewered shape. In the roll device constituting the pre-registration roll device, each roll device includes a linear bearing member 65, a bearing holding member 66, 76 provided on the main body frame 9,
75 is arranged, and the shaft 2 is attached to the linear bearing member.
1, 41 are provided so as to be movable in the axial direction.

Bracket members 64 and 74 are respectively arranged on the stepped portion of the shaft 21 of the roll member, and the spring bearing member 6 is provided inside the linear bearing member.
2 and 72 are arranged, and springs 61 and 71 are provided between the members on both sides to form lateral movement restricting members 60 and 70, respectively. The configuration of the lateral movement restricting member will be described in more detail with reference to FIG. 12. A locking member 63 is fixedly provided on the shaft 41, and the locking member 63 corresponds to the hollow spring receiving member 62. Are arranged. Then, as in the case of each of the above-described embodiments, the movement range of the shaft is regulated by the locking member 63, and the lateral movement regulation member 60 is formed.
The spring 61 provided in the above is prevented from exerting an extra stretching action.

At the other end of the roll member shown in FIG. 12, as shown in FIG. 13, a lateral movement restricting member 60a is provided.
Spring receiving member 62a and bracket member 64 constituting the
a and a spring 61a are arranged. And
Along with the movement of the shaft 41 in the direction of the arrow y, the lateral movement restricting member 60a is acted to move to the left side of the drawing, and the spring 61 is prevented from extending excessively. Therefore, even when the drive roll member and the pinch roll member are supported by the lateral movement restricting member having the same configuration, the roll device can be moved in the direction in which the reaction force in the width direction of the paper is eliminated. Then, when the roll device moves, it is possible to configure a mechanism that applies a force in the compression direction to the spring for a short distance.

[0052]

[Embodiment 3] When a mechanism for supplying a sheet to a transfer drum is constructed: In the example of the roll device of the present invention, the pre-registration roll device in the sheet aligning device is an apparatus for axially moving by the reaction force of the sheet. As described in the case of application, the roll device shown in FIG.
It can also be applied to the resist roll device shown in FIG. In the example shown in FIG. 14, in the color electronic copying machine, the photosensitive drum is arranged corresponding to the transfer drum 5 while holding the paper on the transfer drum 5.
1 shows an apparatus for superposing and transferring color toner images formed on the photosensitive drum. The sheet aligning device for feeding the sheet to the transfer drum 5 constitutes a curved sheet conveying path 7 between the registration roll device 11 and the pre-registration roll device 12.

Then, between the registration roll device and the pre-registration roll device, the loop of the paper is formed downward and temporarily stopped to align the leading edge of the paper, and then the registration roll device 11 is driven to transfer. The sheet is sent toward the drum 5, and the sheet is pressed against the drum by the pressing roll 6 while being attached and held. The pressing roll 6 is supported by an arm member 6a supported via a support shaft 6b, and only when pressing the paper, the driving mechanism (not shown) swings the arm 6a to move the transfer drum 5. The roll 6 is pressed.

The film member 7a arranged in the curved conveyance path 7 applies a pressing force from the outside of the loop of the paper, and when the paper is sent out, the reaction force of the film is used to register the paper. It is urged toward the roll device to assist the feeding action. In the sheet aligning device arranged on the upstream side of the transfer drum, the registration roll device 11 is configured as shown in FIG. 2 or FIG. 11, the driving mechanism is arranged with respect to the driving roll member 20, and driving is performed. A gear is provided in the pinch roll portion with respect to the drive mechanism of the roll portion, and the pinch roll is rotated by the drive mechanism.

In the paper feeding mechanism constructed as described above, the paper is fed by the pre-registration roll device 12 and a loop of the paper is formed in a state where the leading end is nipped by the registration roll device 11. Then, when the registration roll device 11 is driven, as shown in FIG. 15, the reaction force of the loop of the paper causes the paper P to be sent out in a twisted state. It will be sent with a deviation from the reference line K. Therefore, in the present invention, the roll device of the registration roll device 11 is configured to be movable in the axial direction, so that the reaction roll device 11 in the width direction of the paper moves the registration roll device 11 in the axial direction. Is provided.

Then, as shown in FIG. 16, the paper is sent out in a state where the side surface Pe of the paper coincides with the reference line K of the drum 5, so that the reaction force of the paper supports the paper provided on the transfer drum. It is prevented that extra stress is applied to the film member due to the reaction force in the width direction of the paper. Therefore, the paper held on the transfer drum is not given a reaction from the film even when the paper is removed from the registration roll device.
As shown in, the toner image transferred to the paper is not displaced from the middle.

[0057]

Embodiment 4 Another Example of Providing Roll Member Moving Mechanism The roll device of the present invention is applied to a pre-registration roll device and, as shown in FIG. The sheet aligning device 10 can be incorporated in the registration roll device 11. In the sheet aligning device 10 shown in FIG. 17, the registration roll device 11
The gate member 3 is arranged corresponding to the
The pre-registration roll device 12 is arranged at a predetermined interval to form a loop of paper between both roll members so that the leading edge of the paper can be aligned.

In the registration roll device 11, as shown in FIG. 18, lateral movement regulating members 60 and 60a are arranged on both sides of the roll member. Although the roll member has been described as having the same configuration as that shown in FIG. 11, the roll member may have the configuration as shown in FIG. Further, with respect to the drive roll member 20 of the registration roll device 11,
A drive mechanism is arranged at the end of the shaft 21 so as to correspond to the paper feeding operation. As shown in FIG. 18, the lateral movement regulating members 60, 60a are arranged on both sides of the drive roll member 20 to regulate the axial movement distance of the roll member, and to prevent the lateral movement regulating member from springing. On the other hand, by restricting the action of extending excessively, deterioration of the spring can be prevented.

By providing the regulating means as described above, in the sheet aligning device 10 shown in FIG. 17, the leading end of the sheet is regulated by the gate member 3 and the leading end of the sheet is aligned by the loop of the sheet. To act. Then, when the gate member 3 is released and the sheet is nipped by the registration roll device 11, the reaction force in the width direction accumulated on the sheet directly acts on the registration roll device due to the aligning action of the sheet, and the registration roll device 11 is operated. The roll member of the roll device is moved in the axial direction to eliminate the reaction force of the paper. Therefore, the paper delivered toward the photoconductor drum 1 via the registration roll device 11 is not until the state where the paper is nipped by the registration roll device is completed.
While the registration roll device remains in the moved state, the paper feed action is continued while the side face regulation action is performed.

Further, after the trailing edge of the sheet has come out of the registration roll device 11, the reaction force of the sheet against the registration roll device is eliminated, so that the roll device is provided with a lateral movement regulating member on the compression side. It is returned to the original position by the reaction force of, and it is possible to cope with the feeding of the next sheet. In the roll device shown in the above embodiment, since the lateral movement restricting members that receive only the compression action are arranged on both sides, one spring is compressed by the reaction force of the paper, but the other one is compressed. A force in the extending direction does not act on the spring. Then, after the reaction force of the paper is released, the roll is returned by the reaction force of the compressed spring, and the roll member is stopped and held at a position that balances the force of the spring provided on the other lateral movement restricting member. Will be.

[0061]

[Embodiment 5] Example in which a roll device is rotatably provided via a vertical axis As described above, the reaction force generated on the paper is eliminated by using the means for moving the pre-registration roll device in the width direction of the paper transport path. In addition to that, in the present invention,
As shown in FIG. 19, it is possible to provide a mechanism for rotating the pre-registration roll device in the horizontal direction within the plane of the paper transport path via a vertical shaft arranged at the center of the paper transport path. In the paper aligning apparatus 100 shown in FIG. 19, a registration roll device 101 arranged immediately in front of an image transfer portion or a transfer drum, and a pre-registration roll arranged upstream from the registration roll device at a predetermined interval. It is combined with the device 102. As in the case of the embodiment shown in FIG. 1, the registration roll device 101 is provided with a mechanism for eliminating the skew of the paper by moving the paper in the width direction of the paper transport path while nipping the leading end of the paper. Use one.

On the other hand, the pre-registration roll device 102, which is arranged on the upstream side of the registration roll device at a predetermined interval, is in the horizontal plane through the vertical shaft 111 arranged at the central portion in the width direction of the paper conveyance path. When the skew of the paper is corrected by the registration roll device,
A mechanism for rotating the pre-registration roll device by the twisting force generated on the paper is configured. The pre-resist roll device 102 can be configured as shown in FIGS. 20 and 21.
A roll frame 110 that supports 02 is rotatably provided with respect to the main body frame 120 via a vertical shaft 111. The roll frame 110 has brackets 112 and 112a formed on both sides in a state of being bent upward.
On the other hand, the roller shaft is supported via a bearing, and the drive motor 125 is directly connected to the drive roll member 103 to drive the pre-registration roll device.

The pre-registration roll device 102 is constructed by combining the drive roll member 103 and the pinch roll device 106, and the roll members 103 and 1 of both roll devices are combined.
The nipping of the sheet during 06 to perform the conveyance and the aligning action is configured similarly to the case of the conventional pre-registration roll device. Further, in addition to the vertical bracket 112, the frame 110 supporting the roll device is provided with a bracket 113 in the lateral direction, and the bracket 113 and the bracket 121 of the main body frame 120 are provided.
And the adjusting member 115 is arranged between them. In the adjusting member 115, the bracket 113 is attached to the holder provided on the bracket of the main body frame so as to be fixed or detachable.
A means for sliding the pin 116 provided on the above is provided, and a stopper 117 and a spring 118 are provided with respect to the pin 116.
And a mechanism for restricting the movement range of the pin are provided. Then, when a force in the sheet twisting direction is applied to the pre-registration roll device, the pre-registration roll device is caused to swing about a vertical axis in a state of imparting an action such as compressing a spring. .

Further, in the embodiment shown in FIG. 22, the driving system for the driving roll member of the pre-registration roll device is different. In the configuration of the pre-registration roll device shown in FIG. 22, the drive device 130 is arranged in the lower part of the paper transport path without directly connecting the motor to the shaft of the drive roll, and drives the roll through the conduction mechanism. I am trying to do it. In the drive device 130, a gear 133 provided on a drive shaft 131 connected to a motor (not shown) and a gear 134 provided on the intermediate shaft 135 constitute a transmission mechanism 132, and a transmission mechanism 132 is provided on the intermediate shaft 135. The driving force is transmitted between the gear 136 and the gear 137 provided on the shaft of the drive roll. Also, the intermediate shaft 1
35 is a bracket 13 at the bottom of the roll frame 110.
9 is arranged so as to project and the bracket 139 is used to support the conductive member 132 below the vertical shaft 111.
Be sure to provide the meshing part of the gear. By appropriately setting the shape of the teeth of the gear arranged on the conductive member, it is possible to perform the driving force transmission in a good state even when the roll frame rotates about the vertical axis. .

As shown in FIGS. 21 and 22, when the pre-resist roll device is provided so as to be swingable about a vertical axis, as shown in FIG. 23 or 24,
It is possible to configure a mechanism for feeding the paper straight in correspondence with the aligning action on the sheet P and the reaction force generated on the sheet by the aligning action. In the example shown in FIG. 23, the sheet enters the sheet aligning device in a state where the sheet is skewed. Until the leading end of the sheet enters the nip portion of the registration roll device, P is transported in a skewed state. Then, when the leading end of the paper P enters the nip portion of the registration roll device 101 and stops, the registration roll device 101 is kept until the side part of the paper is in a state of being aligned with the reference line as in the above embodiment. Move in the width direction of the paper transport path.

From the state shown in FIG. 23, when the registration roll device 101 is moved to align the sheets, as shown in FIG. 24, the leading end portion of the sheet and the portion nipped by the pre-registration roll device 102. The sheet is twisted between and. Then, the pre-registration roll device 102 is swung about the vertical shaft 111 following the stress in the twisting direction generated on the sheet, and as shown in the figure, the adjusting members 1 arranged on both sides of the roll frame 110.
While the action of compressing only one of the springs 15 and 115a is added, the action of eliminating the reaction force generated inside the sheet is performed. Then, in the state shown in FIG. 24, the roll devices arranged in front of and behind the paper aligning device are driven to carry the paper P toward the downstream portion.

As described above, when the reaction force in the twisting direction of the paper is gradually reduced while the paper is being sent out from the paper aligning device, the force applied from the paper to the pre-registration roll device is increased as shown in FIG. Accordingly, the pre-registration roll device swings about the vertical axis. And
When the sheet finishes passing through the nip portion of the pre-registration roll device, the pre-registration roll device stops at the position where the force of the springs arranged on both sides is balanced, so as to correspond to the next aligning action of the sheet. Therefore, by arranging the means for arranging the adjusting member on both sides of the pre-registration roll device, it is possible to cope with the reaction force of the paper in a good condition, and when there is no paper, the roll shaft conveys the paper. The sheet can be held in a state orthogonal to the direction, and the sheet can be aligned.

As shown in FIGS. 19 to 22, when a mechanism for swinging the roll member about the vertical axis is provided, the roll member provided in the pre-registration roll device is shown in FIG. As shown, it can be slidable relative to the shaft. When a roll sliding mechanism as shown in FIG. 2 is incorporated to form a pre-registration roll device as shown in FIG. 20, when the sheets are aligned, the reaction force generated on the sheets is adjusted by two types of adjusting members. Since this can be eliminated, it is possible to prevent excess stress from remaining on the sheet sent out by the registration roll device, and to prevent skew from occurring in the sheet sent out.

In addition to the above embodiment, in the pre-registration roll device of the present invention, as shown in FIG. 25, two adjusting members can be arranged on one side of the roll frame 110. In the example shown in FIG. 25, the roll frame 110 supporting the pre-registration roll device is provided with a roll frame swingably through a vertical shaft 111, and a bracket is provided on one side of the roll frame. 113 and 114 are arranged. Then, for each bracket, the bracket 12 of the body frame
The adjusting members 115 and 115a are provided between the roll frames 1 and 121a so that the swing of the roll frame can be controlled. In the adjusting member arranged in FIG. 25,
Similar to the mechanism shown in FIG. 20, the adjusting member 115 in which the pin 116 and the spring 118 are combined is configured so that it can respond to the reaction force of the paper as in the case of the above embodiment. To do.

As described above, even when the two adjusting members are arranged on one side of the roll frame, the pre-registration is performed against the reaction force in the twisting direction generated on the sheets aligned by the sheet aligning device. The action of eliminating the reaction force can be imparted by the rotation of the roll member in the roll device. And even if the skew of the paper before alignment is large,
The reaction force in the twisting direction of the sheet when aligned by the registration roll device can be eliminated by moving the roll member in the pre-registration roll device. Then, the sheet sent by the two roll devices of the sheet aligning device can be fed toward the image transfer unit on the downstream side without causing new skew.

The combination member of the driving roll member and the pinch roll member of the present invention is used in an image forming apparatus.
It can be arranged only in the immediately preceding portion of the position where the image is transferred, and an arbitrary roll device in the paper transport path can be configured. Further, the roll device of the present invention can be incorporated also in the document conveyance path of the image forming apparatus, and the mechanism for correcting the skew of the document is shown in FIG. 2 or FIG. It is also possible to apply such a roll device. When the roll device is incorporated in the document transport path, the document can be prevented from being stressed in the width direction, and the document can be transported safely.

[0072]

As described above, with respect to the roll device constituting the sheet conveying device, the roll member is moved to the portion which receives the reaction force of the sheet in the width direction in the direction of releasing the reaction force of the sheet. By providing the mechanism, it becomes possible to eliminate the action in the twisting direction on the sheets when the sheets are aligned. Then, the roll device is moved in the width direction of the sheet conveying path, so that the sheet can be prevented from wrinkling, and the sheet conveying operation can be performed in a good state. Further, the lateral movement restricting members arranged on both sides of the roll member of the present invention constitute a mechanism for imparting the action of compressing the spring member by a short interval, and the spring member is not acted in the extending direction. It is possible to maintain good durability of the.
Therefore, by accurately exerting the action of centering the roll member by the lateral movement restricting member, the action of guiding the sheet by the roll device can be exerted in a good state.

Further, the paper transporting roll device of the present invention can be used as a registration roll device of a paper aligning device arranged immediately before a photosensitive drum in a device such as a general electronic copying machine. It is possible to exert a stable conveying action on the sheet sent to the image transfer section via the registration roll device. Further, in the case where the roll device of the present invention is applied to the part of the registration roll device with respect to the transfer drum whose paper holding portion is made of a film member, it is possible to accurately perform the paper holding action by the transfer drum. Therefore, it is possible to prevent the transferred toner image from being disturbed. Furthermore, in the present invention,
When combining a registration roll device that is movable in the width direction of the paper conveyance path with a preregistration roll device that is rotatably provided via a support shaft located at the center of the paper conveyance path, The configuration of the device can be simplified, and the aligning action on the sheet can be easily exerted. Further, when the roll member of the pre-registration roll device is provided slidably with respect to the support shaft, the reaction force in the twisting direction remaining on the sheet after the skew correction can be easily eliminated, and the image transfer portion It is also possible to prevent further skew from occurring on the sheet conveyed toward the side.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a sheet aligning device of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a roll device of the present invention.

FIG. 3 is an explanatory diagram of a state in which the roll device is moved by a sheet.

FIG. 4 is a cross-sectional view showing the configuration of one end of the drive roll member of the present invention.

FIG. 5 is a cross-sectional view showing the configuration of the other end portion of the drive roll member of the present invention.

FIG. 6 is an explanatory diagram of a state where the roll member of the drive roll member has moved.

FIG. 7 is a cross-sectional view showing the structure of one end of the pinch roll member of the present invention.

FIG. 8 is a sectional view showing the configuration of the other end of the pinch roll member of the present invention.

9 is an explanatory view of a state in which the roll member of the pinch roll member corresponding to FIG. 7 has moved.

10 is an explanatory view of a state in which the roll member of the pinch roll member corresponding to FIG. 8 has moved.

FIG. 11 is an explanatory view showing another configuration of the roll member of the present invention.

FIG. 12 is an explanatory diagram of a state of the lateral movement restricting member when the roll member is moved to one side.

FIG. 13 is an explanatory diagram of a state of the lateral movement restricting member on the side opposite to FIG.

FIG. 14 is a side view of an example in which the roll member of the present invention is applied to a portion that supplies paper to a transfer drum.

15 is an explanatory diagram showing a relationship between a sheet and a registration roll device in the sheet aligning device shown in FIG.

FIG. 16 is an explanatory diagram of a state in which a sheet is held on a transfer drum.

FIG. 17 is a side view of an example in which the roll device of the present invention is applied to a resist roll device.

FIG. 18 is a plan view showing a relationship between the roll device used in FIG. 17 and a photosensitive drum.

FIG. 19 is a plan view of another embodiment of the present invention.

FIG. 20 is a plan view of a mechanism for rotating the pre-resist roll device via a vertical axis.

FIG. 21 is a front view of the pre-resist roll device shown in FIG. 20.

22 is a front view of a pre-registration roll device provided with a drive mechanism different from that of FIG. 21. FIG.

FIG. 23 is an explanatory diagram of a state where a sheet of paper enters the apparatus of FIG.

FIG. 24 is an explanatory diagram of a state in which the pre-registration roll device swings due to the aligned sheets.

FIG. 25 is a plan view of an example in which an adjusting member different from the example in FIG. 20 is arranged.

FIG. 26 is a plan view showing the configuration of a conventional sheet aligning device.

FIG. 27 is an explanatory diagram of another example of a conventional sheet aligning device.

FIG. 28 is an explanatory diagram of a state in which a sheet misalignment occurs when the sheet is held on the transfer drum.

FIG. 29 is a graph showing the relationship between the skew of the sheet and the skew of the sheet after registration in association with the loop amount.

FIG. 30 is a graph showing a relationship between a twist amount of a sheet and a twisting force with a loop forming the sheet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 photoconductor drum, 3 gate member, 5 transfer drum, 10 paper aligning device, 11 registration roll device, 12 pre-registration roll device, 15
Lateral movement mechanism, 20 drive roll member, 21
Drive shaft, 22 roll member, 25 linear bearing member, 30 lateral movement restricting member, 31 spring, 32 spring receiving member, 34 locking member,
40 pinch roll member, 41 shaft, 42
Roll member, 45 Linear bearing member, 46
Bearing holding member, 50 lateral movement restricting member, 51
Spring, 52 spring receiving member, 54 locking member, 55 bracket member, 60/70 lateral movement restricting member, 61/71 spring, 62/72
Spring receiving member, 63/73 locking member, 64.7
4 bracket member, 65/75 linear bearing member, 66/76 bearing holding member, 100 paper aligning device, 110 roll frame, 111
Vertical axis, 115 adjusting member, 120 body frame, 130 drive device.

Claims (9)

[Claims] 1. A transport roll in which a drive roll member and a pinch roll member are arranged so as to face each other, a nip pressure having a constant value is set between the both rolls, and the paper is transported while nipping between the both rolls. In the apparatus, a roll member of each of the drive roll member and the pinch roll member is arranged with a mechanism that allows movement in the axial direction, and a biasing mechanism is arranged on both sides of the roll member to convey the roll member. A paper transporting mechanism that comprises a roll device, and is provided with a mechanism for moving the paper in the width direction of the paper transport path, so that the transport roll device moves the paper laterally while nipping the paper. Roll device. 2. The drive roll member and the pinch roll member that constitute the transport roll device are provided with lateral movement restricting members provided with springs on both sides of the roll member, and with respect to the spring provided in the lateral movement restricting member, A mechanism for restricting the extending direction is provided, and is configured to receive only the force in the compression direction. In the drive roll member and the pinch roll member, after the force for moving the roll member is canceled, The sheet transporting roll device according to claim 1, wherein the sheet transporting roll device is automatically returned to the original position by the lateral movement restricting members on both sides. 3. A drive roll member and a pinch roll member that constitute the transport roll device are provided by fixing a roll member to a shaft member, and the shaft member is axially moved by a linear bearing member provided on a main body frame. A means for restricting the extending direction is provided slidably, and a lateral movement restricting member is arranged between the shaft supporting portion of the main body frame and the roll member to receive a force in the compression direction against the lateral moving restricting member. In the driving roll member and the pinch roll member, the lateral movement regulating members on both sides of the roll member automatically return to the original position after the force for moving the roll member is canceled. The sheet transport roll device according to claim 1 or 2. 4. A drive roll member and a pinch roll member that constitute the transport roll device are provided so that a roll member is provided on a shaft member via a linear bearing member and are slidable in the axial direction with respect to the shaft. A spring support member is provided at a position on both sides of the roll member, and means for restricting an amount of axial movement of the spring support member is provided, and the spring support member and a shaft support member provided on the main body frame. Between the drive roll member and the pinch roll member, after the force for moving the roll member is canceled, by the lateral movement restricting members on both sides of the roll member, The sheet conveying roll device according to claim 1, wherein the sheet conveying roll device is automatically returned to the position. 5. An alignment mechanism including a registration roll device, a pre-registration roll device, and a gate member is arranged with respect to a paper conveyance path of the image forming apparatus, and the leading end portion of the paper is nipped by the registration roll device. In the paper aligning device that performs the action of moving the registration roll device in the width direction and sends the paper along the reference line, the roll members of the driving roll member and the pinch roll member that constitute the pre-registration roll device are By arranging a mechanism that allows movement in the axial direction, and by arranging lateral movement regulating members on both sides of the roll member, the action of moving the paper by the registration roll device in the width direction of the paper transport path is performed. Due to the widthwise stress applied to the paper, it is nipped by the roll device that constitutes the pre-registration roll device. Moving the sheet while laterally, after feeding the paper, the paper transporting roll and wherein the configuring the automatic return mechanism of the roll member by the lateral movement restricting member to the original position. 6. A sheet is held on a transfer drum, and the sheet is transferred to the transfer drum with respect to a device for transferring the color toner images in a superimposed manner via a transfer device for transferring the color toner image arranged corresponding to the transfer drum. An aligning mechanism including a resist roll device, a pre-resist roll device, and a gate member is arranged at a portion for supplying the paper, and the resist roll device is aligned with the paper position between the resist roll device and the pre-resist roll device. In a sheet aligning device for driving the sheet to send the sheet toward the transfer drum, a mechanism for allowing the roll members of the drive roll member and the pinch roll member that constitute the registration roll device to move in the axial direction is arranged. At the same time, lateral movement regulating members are arranged on both sides of the roll member to prevent the reaction in the twisting direction of the paper. The roll device that forms the registration roll device nips the paper,
A mechanism for automatically returning the roll member to the original position by the action of the lateral movement regulating member after the paper is sent out from the registration roll device by causing the reaction force to be released in the lateral direction A roll device for transporting a sheet, which is characterized by: 7. A paper aligning device configured by a registration roll device and a pre-registration roll device for aligning the paper is arranged upstream of the transfer position of the toner image of the image forming apparatus, and the position of the paper is registered. In a paper aligning device that drives the resist roll device in a state of being aligned between the roll device and the pre-registration roll device to send the paper toward the image transfer portion from the photoconductor drum, the registration roll device is configured. A drive roll member for
A mechanism that allows the pinch roll member and each roll member to move in the axial direction is arranged, and lateral movement restricting members are arranged on both sides of the roll member, and this occurs on the paper at the time of paper alignment. Due to the reaction in the twisting direction, the roll device that constitutes the registration roll device moves the paper in the lateral direction while nipping the paper to release the reaction force, and after the paper is sent out from the registration roll device, A roll device for sheet transport, comprising a mechanism for automatically returning the roll member to the original position by the action of the movement restricting member. 8. A paper aligning device for aligning the paper, which is composed of a registration roll device and a pre-registration roll device, is arranged upstream of the transfer position of the toner image of the image forming apparatus, and the position of the paper is registered. In a paper aligning device that drives the resist roll device in a state of being aligned between the roll device and the pre-registration roll device to send the paper toward the image transfer portion from the photoconductor drum, the registration roll device is configured. Drive roll member to
A pre-registration roller device, in which a mechanism that allows movement in the axial direction is arranged, lateral movement regulating members are arranged on both sides of the roll member, and which is arranged in an upstream portion of the registration roller device, includes a roll frame with respect to a main body frame. A roll device that constitutes a registration roll device is rotatably provided via a vertical axis, and an adjusting member is arranged between the main body frame and the roll frame. A mechanism is configured to move laterally to release the reaction force while nipping the nip, and the reaction force in the twisting direction of the aligned sheets causes the pre-registration roll device to rotate through the vertical axis. Move the paper in the direction you want it to, and after feeding the paper from the registration roll device, return the registration roll device and pre-registration roll device to their original positions. A roll device for transporting a sheet, comprising a mechanism for automatically returning. 9. A paper aligning device for aligning the paper, which is composed of a registration roll device and a pre-registration roll device, is arranged upstream of the transfer position of the toner image of the image forming device, and the paper position is registered. In a paper aligning device that drives the resist roll device in a state of being aligned between the roll device and the pre-registration roll device to send the paper toward the image transfer portion from the photosensitive drum, the roll of the resist roll device. The member is configured to be movable in the axial direction, and the roll device that constitutes the registration roll device and the roll member that constitutes the pre-registration roll device move the paper laterally while nipping the paper to release the reaction force. A method for causing the pre-registration roll device to rotate through a vertical axis by the reaction force of the twisted direction of the aligned sheets while performing the action. 9. A mechanism for automatically returning the registration roll device and the pre-registration roller device to their original positions after the paper is sent out from the registration roll device by imparting an action of moving the registration roll device in a direction.
A roll device for transporting a sheet according to item 1.