JPH0729090Y2 - Paper reversing device for copier - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a paper positioning method for positioning a front end of a paper at a position according to a paper size in a conveyance path for carrying in and reversing a paper after an image is transferred. The present invention relates to a sheet reversing device of a copying machine including a member.

[Prior Art] Conventionally, the front end of the paper after the image is transferred in this way is
As a paper reversing device which is positioned by a paper positioning member in the transport path, for example, Japanese Patent Publication No. 63-27252.
There is one as shown in FIG. 11 described in the publication.

This paper reversing device includes a feeding nip 55 for feeding the transfer paper P to a conveyance path 54 for reversing the transfer paper P by three rollers 51, 52 and 53 which rotate only in one direction indicated by an arrow.
A transfer knives 56 for sending out the transfer paper P from the transport path 54 after forming the transfer paper P is formed, and the transfer paper P sent from the carry-in path 57 through the input zip 55 is attached to the end of the transport path 54. Contact the firing pad 58, which is a member, and carry it out from the delivery nip 56 as shown by the broken line.
I am sending it to 59.

Further, there is also a sheet reversing device as shown in FIG. 12 described in Japanese Utility Model Laid-Open No. 62-29360, which has three rollers 61, 62 and 63 respectively rotating only in the direction of the arrow. On the conveying path 64 side, there is provided a forming roller pair 65 in which a plurality of rollers are arranged on opposite shafts at intervals and the respective rollers are arranged so as to be displaced from each other in the axial direction so as to be trapped, and are fed from the carry-in path 67. The transfer paper P to be transferred is conveyed by a forming roller pair 65 rotating in the direction of the arrow in a corrugated shape (cross-sectional shape in the paper width direction orthogonal to the conveying direction) while giving a waist, and the biasing force is applied upward. After abutting against the paper positioning portion 66a on the upper surface of the coil spring 66 mounted so as to act, and pushing it down to carry it into the conveyance path 64, the forming roller pair 65 is reversed to move between the rollers 62 and 63. It is sent to the carry-out route 69 through.

[Problems to be solved by the device]

However, in the case of the paper reversing device as shown in FIGS. 11 and 12, the firing pad 58 and the paper positioning member 66a, which are the paper positioning members, are the transfer paper P fed into the transport paths 54 and 64. Was squeaking,
Since it does not have a function to correct it, if there is skew in the transfer paper when it is being fed by the paper feed section of a copying machine or being fed from the copying machine to the paper reversing device, it will As it is, it is carried into the conveyance path in the sheet reversing device.

Then, the transfer sheet skew, the impact for faster transport speed in the case of a high-speed machine for use in performing the copying process at high speed is large, for example, FIG. 13 (b) shows as theta ₁ of When the transfer sheet P skewed at an angle is carried into the conveyance path and comes into contact with the foam (for example, polyurethane home) 78 of the sheet positioning member, the transfer sheet P fires first as shown in FIG. The part that touches the body 78 is the firing body at that time
Since it is repelled by the repulsive force F _{1 of} 78, when it is ejected from the transport path, it becomes a skew angle θ ₂ (the skew direction changes) that is larger than the skew angle θ ₁ at the time of loading. There was a problem that it would end up.

Therefore, as a method of correcting skew before the paper reaches the paper positioning member, for example, a plurality of paper shifting rollers 71 tilted about 30 degrees with respect to the transport direction of arrow A as shown in FIG. A steel ball 72 is rotatably brought into contact with the upper part of the sheet by its own weight, and the transfer sheet P is conveyed in the direction of the arrow B in the meantime so that the side edge Pc of the sheet abuts against the skew correction fence 73 to correct the skew. However, in the case of the skew correction by this method, since the side edge Pc of the sheet is brought into contact with the skew correction fence 73 to correct it, a large required moving distance L is required, and therefore the entire apparatus is required. However, there is a drawback that the number of parts increases as the size increases.

Further, in the case of skew correction according to FIG. 14, in order to correct skew by bringing the transfer paper P all to the skew correction fence 73 side, the paper is conveyed with the center in the paper width direction positioned at the center of the conveyance path. In the case of a copying machine that uses a center-based transport mode, the sheet cannot be returned to its original position unless it is moved to the center of the transport path again after skew correction.

This invention was made in view of the above problems,
The purpose of the present invention is to be able to reverse and position the sheet without complicating the structure or increasing the size of the apparatus, and to correct the skew when the sheet is skewed. And

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is provided with a paper positioning member which is provided in a conveyance path for carrying in and reversing a paper on which an image has been transferred and which positions the front end of the paper to be carried in at a position according to the paper size. In a sheet reversing device of a copying machine, a fur brush is provided to convey a sheet carried into the conveying path until it abuts on the sheet positioning member, and a cushion member is attached to the sheet abutting portion of the sheet positioning member. A film having a small friction coefficient is attached to the sheet contact surface of the member.

In addition, a roller that is rotated by the sheet conveyed in the conveying path in the conveying path for reversing the sheet and the rotation is continued for a while by inertial force is orthogonal to the sheet conveying direction of the conveying path. It is more effective if the sheet reversing device of the copying machine is configured so that a plurality of sheets are provided at intervals in the paper width direction.

Further, driving means for moving the paper positioning member to carry out the paper in the transport path to the paper reversing device of each of the copying machines, and after the paper carried in the transport path reaches the paper positioning member. A control unit may be provided to operate the drive unit after a lapse of a predetermined time to control the sheet positioning member to move in the sheet unloading direction.

[Action]

According to the paper feeding device configured as described above, when the sheet on which the image is transferred is carried into the conveying path, the fur brush conveys the sheet until the front end contacts the sheet positioning member, and the sheet causes skew. In this case, when the front end of the sheet comes into contact with the cushion member of the sheet contact portion of the sheet positioning member, a film having a small friction coefficient is attached to the contact surface, so that the sheet is orthogonal to the conveying direction. While moving in the paper width direction, the fur brush also permits movement in the paper width direction orthogonal to the paper conveyance direction, so that the skew is corrected.

Further, when a roller whose rotation is continued for a while due to inertial force is provided in the conveyance path for reversing the sheet, when the sheet is conveyed in the conveyance path, the roller is rotated by the sheet. The rotation of the sheet continues for a while due to the inertial force, so that the sheet is reliably conveyed by the conveying force of the rollers until the front end contacts the sheet positioning member.

Further, the driving means for carrying out the paper in the carrying path and the control for moving the paper positioning member in the paper carrying-out direction after a lapse of a predetermined time after the paper carried in the carrying path reaches the paper positioning member In the case where the control means is provided, even if the sheet carried into the conveyance path has skewed, the control means completes the correction of the skew after the front end of the sheet reaches the sheet positioning member. Since the driving means is operated after a lapse of time and controlled so as to carry it out, the skew is surely corrected.

〔Example〕

Hereinafter, a specific description will be given based on an embodiment of the present invention.

FIG. 1 is a block diagram of a sheet reversing device of a copying machine showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram showing an entire copying machine equipped with the sheet reversing device.

As shown in FIG. 2, this copying machine has a copying machine main body 1, an automatic document feeder (hereinafter abbreviated as "ADF") 2, and a transfer sheet directly or when a mode using a sorter is selected. Paper reversing device 3 that reverses and sends out to the sorter 4
And the sorter 4 thereof.

The copying operation of the copying machine is started by setting the necessary copying conditions from the operation unit provided in the copying machine main body 1 and pressing the copy start button.

Here, the ADF 2 is provided with a document tray 201, and a document placed on the document tray 201 is a document feed belt 202.
The document is fed by the above-mentioned method and is conveyed onto the contact glass 101 through the document conveying path 203, where the flash lamp 102 emits light, whereby the original is irradiated with the entire surface at one time.

The reflected light from the original is the first mirror 104, the through lens.
The belt photosensitive member 107 is exposed through 105 and the second mirror 106.

Electric charges are uniformly applied to the belt photosensitive member 107 by the charger 108, and an electrostatic latent image is formed by exposure. The electrostatic latent image on the belt photosensitive member 107 is developed by the developing device 110 after the eraser 109 removes the electric charge of the unnecessary portion.

The developed document image is transferred to the transfer charger 111 at the transfer unit.
Is transferred onto the transfer paper P (paper).

The transfer paper P is fed from one of the paper feed cassettes 112, 113, 114 or the double-sided tray 121, passes through the transport path 115,
The registration roller 116 sends the image to the transfer unit in time with the original image. The transfer paper P to which the original image is transferred is sent to the fixing device 118 by the conveyance belt 117 and fixed there, passes through the paper size sensor 16, and is switched to the discharge tray 119 after fixing by the switching operation of the branch claw 122. The sheet may be conveyed or may go straight and be conveyed to the sheet reversing device 3.

The original on the contact glass 101 is sent out by the original conveying belt 204 after the light irradiation (exposure) is completed, and is ejected by the original discharging roller
205 returns it to the original tray 201 again.

The sorter 4 is provided with a horizontal transport device 15, a vertical transport device 10, and a plurality of bins 12 provided in a plurality of stages for stacking the transported transfer paper P in a cover 11.

The sheet reversing device 3 sends the transfer sheet carried into the first conveying path 20 to the second conveying path 21 which is a conveying path for reversing the transfer sheet by switching the switching claw 23, or without reversing the third sheet as it is. It is conveyed to the conveying path 22 and sent to the sorter 4.

As shown in detail in FIG. 1, the paper reversing device 3 is provided in a second conveyance path 21 for carrying in and inverting the transfer paper P on which an image has been transferred, and the front end of the paper to be carried in is indicated by an arrow. A paper positioning member 30 for positioning at a position corresponding to the paper size in the C direction is provided, and a fur brush 28 is provided for carrying the transfer paper P carried into the second carrying path 21 until it abuts on the paper positioning member 30. A cushion member 32 is attached to the paper contact portion on the upper surface of the positioning member 30, and a film (for example, polyester film) 13 having a small friction coefficient is attached to the paper contact surface of the cushion member 32.

Then, to the right of the first transport path 20 arranged in a substantially horizontal state, a second transport path for reversing the transfer paper P extending downward with a slight upper portion inclining to the right with respect to the vertical direction. 21 is provided, and the transfer paper P that is inverted and carried out from the second transport path 21 is sent out above the second transport path 21, or the first transport path 21 is provided.
A third conveyance path 22 is provided for directly receiving the transfer paper P from 20 without passing through the second conveyance path 21.

The switching claw 23 provided at the branching portion of the first transport path 20, the second transport path 21, and the third transport path 22 uses the solenoid 24 to move the switching claw 23 to the first position.
The position shown by the solid line and the position shown by the phantom line in the figure can be changed over, and the first transport path 20 has a guide plate 20a.
And 20b, the second conveyance path 21 is formed by guide plates 21a and 21b, and the third conveyance path 22 is formed by guide plates 22a and 22b.

At the position near the switching claw 23 of the first transport path 20, the first
Entrance sensor 44 for detecting the transfer paper P carried into the transport path 20
Is provided and a pull-in roller 25 and a reversing roller 26 are arranged at the entrance of the second transport path 21. The pull-in roller 25 and the reversing roller 26 are pressed against each other in the arrow direction to rotate the transfer paper P into the second transport path 21. The pull-out roller 27 is arranged on the opposite side of the pull-in roller 25 of the reversing roller 26 at the exit of the second transport path 21. The pull-out roller 27 is pressed and rotated in the arrow direction to rotate the second transport path.
The transfer sheet P, which has been fed into the sheet 21 and has been completely inverted, is carried out of the second conveyance path 21.

Below the pull-in roller 25 and the reversing roller 26, for example, a fur brush 28 having a rayon material and a brush original line thickness of 300 denier / 30 F and a flocking density of 11,000 / inch ² is provided. 2nd by 26
The transfer sheet P fed into the conveying path 21 is brought into contact with the brush end on the outer periphery of the fur brush 28 to give a conveying force in the direction of arrow D.

29 is a shaft that supports the guide plate 21b so as to be openable and closable in the direction of arrow E in FIG. 1, and the guide plate 21b can be opened in the counterclockwise direction about this shaft 29 during jam processing or the like. ing.

Further, the sheet positioning member 30 is screwed to a timing belt 31 which can move along the second conveyance path 21, and the timing belt 31 is driven by the forward / reverse rotation of a stepping motor 35, The sheet positioning member 30 moves in the arrow C direction along the second transport path 21.

Then, the front end of the transfer paper P carried into the second transport path 21 is brought into contact with a plurality of supporting portions 30a (see also FIG. 3) of the paper positioning member 30 projecting into the second transport path 21. , The cushioning member 32 formed by, for example, a polyurethane home, which loosens the shock and impact sound at the time of its abutment, is attached by adhesion, and the cushioning member 32 is rubbed against the upper surface side to be the paper contacting surface. Film 13 with a small coefficient (thickness of about 0.188 to 0.3 mm) is attached.

A discharge roller 42, which is driven by a drive motor 43 via a timing belt 45, is provided in the third transport path 22. With this, the transfer paper P in the third transport path 22 is sorted by a sorter 4
Drive motor 43 is driven through a timing belt 45 to an idler in which the gear portion of the reversing roller 26 meshes with the gear portion.
It also drives 46 and the fur brush 28.

FIG. 3 is a perspective view showing a drive system for driving the sheet positioning member 30.

The timing belt 31 is stretched between a pair of pulleys 33 and 34, a timing belt 38 is stretched between a pulley 37 and a pulley 36 which are integral with the pulley 34, and the timing belt 38 is connected to a stepping motor. The 35 is designed to rotate in both forward and reverse directions.

Further, the paper positioning member 30 is fixed to the back surface on the side opposite to the cushion member 32 with a fixing plate 39, and a shielding plate 40 is screwed thereto.
When the sheet positioning member 30 is at the standby position which is the home position, the home position sensor 41 fixed to the device side plate (not shown) is closed.

FIG. 4 is a diagram showing the positional relationship among the fur brush 28, the pull-in roller 25, and the reversing roller 26.
28 is arranged so that its outer peripheral portion is embedded in the tangent line a of the pull-in roller 25 and the reversing roller 26, and the angle θ formed by the tangent line a and the center line b of the second conveying path 21 is, for example, 10 ° to
40 °.

FIG. 5 is a plan view showing the positional relationship on the plane of the pull-in roller 25, the reversing roller 26, and the pull-out roller 27.

A narrow reversing roller 26 is brought into contact with a pull-in roller 25 having a wide width and projecting portions 25a, 25a formed on both ends, and the pull-out roller 27 is pressed against the reversing roller 26.

Then, the transfer paper P conveyed to the second conveyance path 21 through the space between the pull-in roller 25 and the reversing roller 26 has a corrugated cross section in the paper width direction orthogonal to the conveyance direction (direction D shown in FIG. 1). Curved to give rigidity in the transfer paper transport direction,
The transfer paper P is surely advanced along the guide plate 21b in the second conveyance path 21 in the direction of the arrow D until it comes into contact with the paper positioning member 30.

Then, when the trailing edge of the transfer sheet P passes through the pull-in roller 25 and the reversing roller 26, the wavy state, which is a loosening action of the sheet, is canceled.

FIG. 6 is a schematic diagram showing in simplified form a roller provided in the second conveyance path, which is continued for a while by inertial force, and its vicinity.

The second transport path 21 is rotated in the arrow F direction by the transfer paper P that is transported in the second transport path 21 in the arrow D direction, and the rotation is continued for a while due to the inertial force. Rolls 14a-14d
A plurality of (four in this example) are provided at intervals in the paper width direction indicated by an arrow G in FIG. 7 which is orthogonal to the paper transport direction of the second transport path 21, and each roller 14a to 14d is provided with a guide plate. Each opening 21c formed in 21a is projected into the second transport path 21.

Then, as shown in FIG. 8, guide ribs 21d projecting toward the second transport path 21 are formed on the guide plate 21b at intervals and extend along the sheet transport direction.
Rap dimension L between the protruding end of 21d and the outer peripheral end of each roller 14a to 14d
₁ is, for example, 0 to 0.5 mm.

The rollers 14a to 14d are made of, for example, polyacetal as a whole, or the outer peripheral portion is covered with rubber so that the central portion is made of metal, and after the rotation, the rotation continues for a while due to inertial force. As shown in FIG. 7, all four of them are independently rotatably supported by a support portion (not shown) of the guide plate 21a in a free state having no drive source.

As shown in FIG. 8, a plurality of guide ribs 21e similar to the guide ribs 21d are formed on the guide plate 21a at intervals along the sheet transport direction.

Next, the operation of this embodiment configured as described above will be described.

The transfer paper P ejected from the copying machine is turned over to reverse the sorter 4
When the transfer paper P on which the image has been transferred passes through the paper size sensor 16 in the copying machine main body 1 in the case of being conveyed to, the stepping motor 35 corresponds to the paper size and rotates counterclockwise in FIG. Then, the sheet positioning member 30 is raised from the standby position, which is the home position, to a position corresponding to the sheet size, and then stopped.

Further, the switching claw 23 is switched to the position shown by the solid line in FIG. 1 by the solenoid 24, and the transfer paper P is sandwiched between the pull-in roller 25 and the reversing roller 26 from the first transport path 20 and the second transport is performed. It is brought into Road 21.

The transfer paper P is conveyed and positioned by the fur brush 28 until the front end contacts the cushion member 32 of the paper positioning member 30 via the film 13, and at this time, the paper feed unit of the copying machine or the copying main body 1 When the transfer sheet is skewed when being sent from the sheet reversing device 3 to the sheet reversing device 3, the sheet is carried into the second transporting path 21 through the first transporting path 20 in the skewed state.

However, in this embodiment, when the front end of the transfer paper comes into contact with the film 13 on the cushion member 32, the film
Since 13 is formed of a material having a small friction coefficient, the transfer paper P moves (laterally shifts) in the paper width direction orthogonal to the transport direction indicated by an arrow G ₁ in FIG. Since the movement of the transfer sheet P in the direction of the arrow G ₁ orthogonal to the transport direction is allowed, skew of the transfer sheet is corrected.

Then, when a predetermined time T elapses after the entrance sensor 44 detects the rear end of the transfer paper P, the stepping motor 35 makes the first motor
In the figure, the paper positioning member 30 is raised by rotating a predetermined number of pulses in the counterclockwise direction, the upper end of the transfer paper P is surely caught in the pull-out roller 27 and the reversing roller 26, and then the paper is rotated in the reverse direction. Return the paper positioning member 30 to its original position,
This operation is repeated until the copy end, in preparation for carrying in the next transfer paper.

It should be noted that the predetermined time T for driving the stepping motor 35 after the entrance sensor 44 detects the trailing edge of the transfer sheet P means that the leading edge of the transfer sheet is the sheet after the entrance sensor 44 detects the trailing edge of the transfer sheet. A preset time T ₁ (for example, 100 msec) before contacting the film 13, which serves as the paper contact surface of the positioning member 30
And a predetermined time T ₂ after the transfer paper reaches the upper surface of the film 13 and the predetermined time T ₂ .

Further, T ₁ may be set by the time from when the entrance sensor 44 detects the front end of the transfer sheet to when the entrance sensor 44 contacts the film 13. In this case, the position of the sheet positioning member 30 differs depending on the sheet size, so T ₁ is slightly different for each sheet size.

The predetermined time T ₂ are, transfer sheet second transport path 21 which caused the skew
The film on the cushion member 32 is loaded into the film.
It is a time set in consideration of the time for the skew to be corrected by contacting 13 or the time for the transfer paper vibrated up and down by the repulsive force to settle when contacting the cushion member 32, for example, 150 msec. That is all.

In this way, the transfer sheet P whose upper ends are caught by the pull-out roller 27 and the reversing roller 26 is conveyed upward in the third conveying path 22 and is sent to the sorter 4 by the discharge roller 42.

When the work of reversing the transfer paper P of the same size is completed, the stepping motor 35 rotates in the clockwise direction in FIG. 1, and the paper positioning member 30 and the shut-off plate 40 integrated therewith form the home position sensor 41. Move to the home position that shuts off and stop.

In addition, in this embodiment, as described above, the second conveyance path 21
As shown in FIG. 7, since a plurality of rollers 14a to 14d whose rotation is continued for a while by inertial force are provided, each roller is supported by the transfer paper P transported in the second transport path 21. When the transfer paper P is rotated (in the direction of arrow F in FIG. 6) and skew occurs as shown in FIG. 7, the paper positioning member 30
The rotation is stopped from the roller 14a corresponding to the P ₁ portion which is in contact with the upper film 13, and the rollers 14b to 14d corresponding to the portions which are not yet in contact are continuously rotated by inertial force. Furthermore, the skew is corrected more reliably.

FIG. 9 is a block diagram showing the control unit of the sheet reversing device 3 and its related configuration.

The sheet reversing device 3 is controlled by a control unit 80, which is a microcomputer having a function of making various determinations and processings, and includes a CPU (central processing unit),
Stores the input / output unit (I / O) for various signals, the control program of this control unit, the number of pulses to drive the stepping motor 35 set corresponding to each paper size, and the times T ₁ and T ₂ described above. The ROM and the ROM for temporarily storing various input data and output data for control are configured.

Then, the control unit 80 controls the copying machine main body 1 by pressing an unillustrated selection button by the operator to select a sheet reversal signal of the copying paper P and sort / tuck mode signals for the sorter mode. Then, various signals such as the number of copies and the number of originals are input by serial communication, and a paper detection signal is input from the entrance sensor 44 in the paper reversing device 3.

Then, the control unit 80 outputs a motor drive signal for driving the sheet positioning member 30 of the sheet reversing device 3 to the stepping motor 35 via a driver (not shown) in accordance with each input signal, and at the same time, reverses the sheet. A signal for driving each conveying system such as the pull-in roller 25, the reversing roller 26, the pull-out roller 27, and the fur brush 28 shown in FIG. 1 in the apparatus 3 is also output to each conveying system via a driver (not shown).

In this embodiment, the control unit 80 serves as a driving unit after a predetermined time T _{2 has} elapsed after the transfer paper P carried into the second transport path 21 of FIG. 1 reaches the paper positioning member 30. The stepping motor 35 is operated to control the sheet positioning member 30 so as to move the sheet positioning member 30 in the sheet unloading direction (the direction opposite to the arrow D in FIG. 1).

The control unit 80 may also be provided in the sorter 4 by also functioning as the control unit of the sorter 4.

Next, a process executed by the control unit 80 for operating the stepping motor 35 after a lapse of a predetermined time T ₂ after the transfer paper reaches the paper positioning member 30 will be described with reference to a flow chart in FIG. .

Flow chart of FIG. 10 is for showing an example of a subroutine for operating the scan Tetsu ping motor 35 after the above-mentioned predetermined time T _2, the sheet inverting signal operation unit of the copying machine main body 1, sort / Sutatsukumodo signal, the number of copies When the copy start button is pressed after various signals such as the number of originals are selected, the control unit 80 executes judgment and processing according to this flow chart.

First, it is judged whether or not the transfer paper on which the image has been formed has passed through the paper size sensor 16 (FIG. 2) and the paper size signal has been input, and if so, proceed to the next step. Drives the stepping motor 35 to position the paper positioning member
The process of moving 30 to a position suitable for the paper size is executed.

Next, it is judged whether or not a sheet detection signal due to the passage of the transfer sheet is input from the entrance sensor 44, and if it is input, the process proceeds to the next step and stepping is performed after the above-mentioned predetermined time T (T ₁ + T ₂ ). The motor 35 is driven to raise the paper positioning member 30 to move the transfer paper P between the pull-out roller 27 and the reversing roller 26, and in the next step, the stepping motor 35 is reversely rotated to move the paper positioning member 30. Return it to its original position in preparation for the next transfer.

Thereafter, it is determined whether or not the paper reversal signal is canceled by an operation on the copying machine main body 1 side, or the reversal process of reversing the transfer paper, which is ended when copying of a predetermined number of copies is completed, is completed. Then, when it is completed, the stepping motor 35 is driven to return the paper positioning member 30 to the home position, and when the processing is completed, the process returns to the main routine and if the copying is started again, the above judgment and processing are performed. repeat.

[Effect of device]

As described above, according to the paper reversing device of the copying machine according to the present invention, it is possible to add a small film to the cushion member attached to the paper positioning member without complicating the structure or increasing the size of the paper. When skew occurs, it can be corrected and the sheet can be inverted and positioned.

Further, even if the copying machine is a high-speed machine having a high conveyance speed, the skew of the sheet can be surely corrected, and
Even in the case of a center-based copying machine in which the paper is transported through the center of the transport path, skew can be corrected while the paper remains at the center, which is convenient.

Furthermore, if a roller is provided in the conveyance path for reversing the paper, the rotation of which continues for a while due to inertial force, when the paper is conveyed in the conveyance path, the roller is rotated by the paper. Since the rotation continues for a while due to the inertial force, the sheet is reliably transported by the transporting force of the roller until the front end contacts the sheet positioning member.

Further, the driving means for unloading the paper in the transport path and the control for moving the paper positioning member in the paper unloading direction after a lapse of a predetermined time after the paper loaded in the transport path reaches the paper positioning member In the case where the control means is provided, even if the sheet is skewed, the drive means is actuated by activating the driving means after a lapse of a predetermined time after the front end of the sheet reaches the sheet positioning member and the correction of the skew is completed. Since it is carried out, the skew can be surely corrected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a sheet reversing device of a copying machine showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing an entire copying machine similarly equipped with the sheet reversing device, and FIG. 3 is a sheet positioning member. FIG. 4 is a perspective view showing a drive system for driving 30. FIG. 4 is an explanatory view showing a positional relationship between the fur brush 28 and the pull-in roller 25 and the reversing roller 26. FIG. 5 is a pull-in roller 25, the reversing roller 26 and the pull-out roller 27. FIG. 6 is a plan view showing the positional relationship of FIG. 6, FIG. 6 is a schematic view showing a roller provided in the second conveyance path, which is continued for a while by inertial force, and a vicinity thereof, and FIG. 7 is a second conveyance path. FIG. 8 is a front view showing the vicinity of the roller 14 provided on the roller 21, FIG. 8 is a view of the roller 14 protruding into the second transport path 21 as seen in the transport direction of the transfer paper, and FIG. 9 is control of the paper reversing device 3. Fig. 10 is a block diagram showing the parts and their related configurations. Flow chart showing an example of a subroutine for operating the stepping motor 35 after a predetermined time after reaching, FIG. 11 and FIG. 12 are schematic configuration diagrams showing a simplified example of a conventional different sheet reversing device, respectively. (A) and (b) are perspective views for explaining the process in which the skewed transfer paper comes into contact with the foam and the skew is increased by the repulsive force, and FIG. 14 is tilted in the transport direction. It is a top view which shows the example of the apparatus which corrects skew by a paper gathering roller. 1 ... Copier body, 3 ... paper reversing device 13 ... film, 14 ... roller 20 ... first transport path, 21 ... second transport path 22 ... third transport path, 25 ... pull-in roller 26 …… Reversing roller, 27 …… Pullout roller 28 …… Fur brush, 30 …… Paper positioning member 32 …… Cushion member 35 …… Stepping motor (driving means) 44 …… Inlet sensor, 80 …… Control unit (control) Means) P ... Transfer paper (paper)

Claims (3)

[Scope of utility model registration request] 1. A sheet reversing device for a copying machine, which is provided in a conveying path for carrying in and reversing a sheet on which an image has been transferred and which has a sheet positioning member for positioning the front end of the sheet to be carried in at a position according to the sheet size. In the apparatus, a fur brush that conveys a sheet to be conveyed into the conveying path until it abuts on the sheet positioning member is provided, and a cushion member is attached to a sheet contact portion of the sheet positioning member, and a sheet contact surface of the cushion member. A sheet reversing device for a copying machine, characterized in that a film having a small friction coefficient is attached to the sheet. 2. A paper transporting means for transporting a roller, which is rotated by a paper transported in the transporting path, and whose rotation is continued for a while by an inertial force, into a transporting path for reversing the paper. 2. The sheet reversing device for a copying machine according to claim 1, wherein a plurality of sheets are provided at intervals in a paper width direction orthogonal to the direction. 3. A drive means for moving a paper positioning member to carry out a paper in a conveyance path, and a driving means for a predetermined time after the paper carried in the conveyance path reaches the paper positioning member. 3. A sheet reversing device for a copying machine according to claim 1, further comprising control means for operating the sheet positioning member so as to move the sheet positioning member in the sheet unloading direction.