JP2520205Y2 - Sheet transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a sheet conveying device such as an automatic document feeder for conveying a document onto a platen of an image processing apparatus such as a copying machine or a laser printer.

[Conventional technology]

Generally, in an image processing apparatus such as an automatic document feeder mounted on the platen glass of a copying machine, a plurality of documents are set with the document surfaces facing the document tray, and the last page (top sheet) of the document is transferred onto the platen glass. After the feeding and copying operations, the front and back of the original is reversed and discharged to the paper discharge tray. Therefore, the discharged originals are stored in the paper discharge tray in page order, and the copied papers are also stored in page order in the paper discharge tray of the copying machine.

However, when this automatic document feeder is attached to a copying machine capable of double-sided copying, the following problems occur when copying a plurality of originals having images formed on only one side onto both sides of paper. That is, if the original is fed from the last page of the original to the platen glass with the original side facing downward, double-sided copying can be performed in the order of pages if the original is an even number, but if the original is an odd number, the copied paper is copied. Among them, there is a defect that the top surface of the topmost sheet is blank.

Therefore, the originals are set on the original tray with the original side facing up, and the originals are fed one by one from the first page (top sheet), and the front and back of the original are reversed by the U-shaped conveyance path. An automatic document feeder has been conceived which is switched back by a roller and is supplied onto a platen glass so that a document is conveyed onto the platen glass with the document surface facing down. In the automatic document feeder, the page order of the originals matches the page order of the copied sheets even in the case of single-sided copying, and even in the case of double-sided copying, the number of originals may be even or odd. , The first sheet of copied paper is never blank.

By the way, depending on how the original set standard of the copying machine is provided, there is a case where the original must be conveyed along the set standard (one side standard) on the platen glass.

In order to attach the above-mentioned automatic document feeder to such a copying machine, an aligning roller inclined toward the set standard is provided at the portion for supplying the switched-back document onto the platen glass, and the document is set as the standard. Need to be along.

However, in order to surely perform the aligning by the aligning roller, the document conveyed on the platen glass must be in a freely movable state at the time of aligning.

For this reason, conventionally, the pressure contact of the forward and reverse rotation rollers of the switchback portion is released during aligning.

[Problems to be solved by the invention]

In order to align the switched-back document as described above, a pressure contact release mechanism for the aligning roller and the forward / reverse rotation roller is required, resulting in an increase in cost.

[Purpose of device]

This invention, when reversing the conveyance direction of a conveyance sheet such as a document in a switchback part, does not release the pressure contact of the rotating body that rotates in the forward and reverse directions, and the conveyance angle of the conveyance sheet before and after reversing the conveyance direction. It is an object of the present invention to obtain a sheet conveying device that can be different.

[Example of device]

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<Structure> As shown in FIG. 1, a copying machine 12 capable of double-sided copying is mounted on the mounting table 1. The copying machine 12 is provided with a document set reference on one side (for example, the front side). Further, the paper feeding device 3 and the paper feeding cassette 5 are attached to the paper feeding side of the copying machine 12, and the sorter 7 is attached to the paper discharging side. Further, the automatic document feeder 10 is placed on the platen glass 24 of the copying machine 12.

The automatic document feeder 10 includes a separating unit 14 and a conveying unit 16.
And a discharge tray 28 attached to the copying machine 12.

The separating unit 14 can separate and convey the originals stacked on the original tray 22 one by one.

As shown in FIG. 2, the document tray 22 has a hinge 19 on the support portion 17.
It is rotatably mounted via a.

In the housing 20 that covers the separating portion 14, a document support plate 34 is arranged in a continuous state with the document tray 22 through the document insertion port 21. A pickup roller 36 is rotatably provided above the document support plate 34. The pickup roller 36 engages with the uppermost sheet of the original placed on the original support plate 34, and rotates to feed the original one by one. Adjacent to the pickup roller 36, there is provided a sensor 35 which detects that a document is set on the document support plate 34 and turns on the power of the automatic document feeder 10.

The pickup roller 36 is rotatably attached to one end of a frame 38 via a shaft 40. The other end of the frame 38 is rotatably attached to a shaft 42, both ends of which are rotatably attached to the side surface of the housing 20. This axis 42
A pulley 44 is fixed to the shaft 40, and a pulley 46 is also fixed to the shaft 40. Timing belt 48 between the pulleys 44 and 46
The timing belt is wound by the rotation of the shaft 42.
The pickup roller 36 is rotationally driven via 48.

A paper feed roller 50 is fixed to the shaft 42. A separating roller 52 is provided in a state of rolling contact with the paper feeding roller 50. The rolling contact portion is provided so as to face the original feeding position. Further, the paper feed roller 50 is rotated clockwise in FIG. 2, and the separation roller 52 is also rotated clockwise.

A stopper 54 is provided at the above-mentioned document feeding position so as to be movable back and forth. The stopper 54 is fixed to a shaft 56, and the shaft 56 is rotated by a solenoid 58. A lever 60 is rotatably attached to the shaft 56. The tip of this lever 60 is attached to the protruding end 62 of the frame 38.
Can be contacted with. This lever 60 allows the protruding end 62
While is pressed, the pickup roller 36 is separated from the original, and the original is not taken out.

In this manner, when the shaft 56 faces the stopper 54 so as to close the original feeding position by turning off the solenoid 58, the stopper 54 engages the lever 60 so that the protruding end 62 is pushed downward. ing.

The solenoid 58 is turned on when the copy start button of the copying machine 12 is pressed. Further, a sensor 63 for detecting that the original has been taken out is provided downstream of the rolling contact portion between the paper feed roller 50 and the separation roller 52 along the taking-out direction of the original.

Inside the housing 20, there are provided a reversing path 64 for reversing the front and back of the fed original, and a conveyance direction changing path (switchback path) 65 for changing the conveying direction of the original.

The reversing path 64 is formed in a U shape, and guides the document sent from the document tray 22 to the conveyance direction changing path 65 in a state where the front and back sides of the document are reversed. At the base end of the reversing path 64, a registration roller 66 and a pressure roller 68 are provided in a state of rolling contact with each other. The rolling contact portions of the rollers 66 and 68 are located in the reversing path 64. Further, a sensor 69 for detecting that the original has entered the reversing path 64 is provided on the upstream side of the transfer contact portion along the original conveying direction.

On the other hand, the conveyance direction changing path 65 is provided with a conveyance roller 70 made of, for example, rubber that is driven in forward and reverse directions. A driven roller 72 as a rotating body is in pressure contact with the transport roller 70.

The driven roller 72 is a rotator that comes into contact with a conveyed document and rotates in the normal direction according to the conveying direction of the document, and is supported by an angular shaft 73 as a rotator supporting shaft. Then, the driven roller 72 is attached to the square shaft 73 so that the engagement angle with respect to the square shaft 73 varies depending on the document conveying direction.

As shown in FIGS. 3 to 6, the driven roller 72 has a square shaft 73.
Is inserted, and a bearing portion 75 having a hole 74 (for example, a trapezoidal cross section) as an axial hole having a different engagement angle with respect to the square shaft 73 according to the transport direction of the document and the document being transported and contacting the document, The rotary unit 76 is made of, for example, synthetic resin and rotates with respect to the bearing unit 75.

The hole 74 has one opening (small hole portion) small and the other opening (large hole portion) large, and can be tilted at an angle α with respect to the angular axis 73. In addition, the bearing 75 has flanges on both ends.
It has 45,47. Further, stoppers 37 and 39 are attached to the square shaft 73 to regulate the moving range of the bearing portion 75.

The conveyance direction changing path 65 is provided with a sensor 71 that detects passage of a document.

A branch guide path 78 is provided at a branch portion between the front / back reversing path 64 and the conveyance direction changing path 65. Further, a switchback seat 80 is provided at this branch portion.

At the exit of the branch guide path 78, a static elimination brush 82 for eliminating static electricity on the original is provided.

The conveying unit 16 conveys the originals sent out one by one from the separating unit 14 on the platen glass 24, and is rotatably attached to the upper surface of the copying machine 12 via a hinge (not shown).

A sensor 29 for detecting a document is provided in the cover 26 of the transport unit 16.
And a stopper 84 capable of opening and closing a document conveyance path by a solenoid 86, and a conveyance belt 32 installed between the pulleys 31 and 33.

<Operation> The automatic document feeder 10 configured as described above operates as follows.

When documents are first stacked on the document tray 22 with the document surface facing upward, the leading edge of the document is positioned on the document support plate 34 via the document insertion port 21. The sensor 35 is turned on by the document placed on the document support plate 34, the automatic document feeder 10 is turned on, and the document can be fed. Note that in this document feedable state, the solenoid 58 is off, so the stopper 54 faces the document feed position,
No manuscript is sent out.

When the copy start button of the copying machine 12 is pressed, the solenoid 58 is turned on and the shaft 56 rotates counterclockwise in FIG.
As a result, the stopper 54 retreats from the original feeding position, the tip of the lever 60 separates from the projecting end 62 of the frame 38, and the shaft 42 rotates clockwise. Due to the rotation of the shaft 42, the paper feed roller 50 and the pickup roller 36 rotate clockwise, respectively, and the frame 38 also rotates clockwise.
Rotate around. And the pickup roller 36
Is brought into contact with the uppermost sheet of the original, and the original is fed one by one toward the paper feed roller 50 by the rotation of the pickup roller 36.

The leading edge of the original sent from the original tray 22 is the sensor.
When detected by 63, the separation roller 52 rotates clockwise, the solenoid 58 is turned off, the lever 60 rotates clockwise and pushes the protruding end 62 of the frame 38, and the pickup roller 36 is pushed up. In this way, the pickup roller
Even if two originals are sent by rotating 36,
The rotation of the separation roller 52 causes the second document to be the document support plate.
It is rejected by 34 and only one manuscript is sent out.

The original separated in this way is supplied to the reverse path 64, and when the sensor 69 is turned on, a predetermined time T1
After a lapse of time, the rotations of the paper feed roller 50 and the separation roller 52 are stopped, and the registration roller 66 and the conveyance roller 70 start rotating counterclockwise.

At this time, the rotating portion 76 of the driven roller 72 receives a clockwise force, and thus rotates in a state perpendicular to the angular axis 73 as shown in FIG.

After the sensor 69 is turned on, the document is supplied to the rolling contact portion between the registration roller 66 and the pressure roller 68. The original is deflected at the contact portion, and the orientation of the original is registered.

The rotation of the registration rollers 66 guides the document along the reverse path 64, pushes the sheet 80 away at the junction of the branch guide path 76, and holds the sheet between the conveyance roller 70 and the driven roller 72. Then, the document is further transported by the rotation of the transport roller 70.

When the trailing edge of the document passes the sensor 71, the rotations of the registration roller 66 and the conveyance roller 70 are stopped. In this way, the transportation of the document is temporarily stopped.

Then, after a lapse of a predetermined time T2 after the sensor 71 detects the trailing edge of the document, the registration roller 66 and the conveyance roller 70 are rotated clockwise.

Therefore, the rotating portion 76 of the driven roller 72 receives a counterclockwise force to change its direction and rotates in a state of being inclined by the angle α with respect to the angular axis 73 as shown in FIG. Therefore, the document is fed back through the transport direction changing path 64 while being aligned on the front side.

At the joint between the reversal path 64 and the separation guide path 78,
The document is prohibited from being conveyed toward the registration rollers 66 by the sheet 80, and is guided toward the conveyance path 16 via the separation guide path 78.

The document 29 taken into the cover 26 of the transport unit 16 has its leading edge detected by the sensor 29, and after a predetermined time T4, the transport roller.
The rotations of 70 and the registration roller 66 are stopped.

Therefore, the document is stopped with its leading end in contact with the stopper 84.

When a predetermined time T5 elapses after the sensor 29 detects the leading edge of the document, the solenoid 86 is turned on and the stopper 84 is opened,
When the predetermined time T6 has elapsed, the transport roller 70 and the transport belt 32 are driven for the predetermined time T7. In this way,
The original is conveyed on the platen glass 24 along the setting reference and set at a predetermined position. Then, when the copying operation is completed, the conveyor belt 32 is driven again, and the original is ejected from the platen glass 24 and is accommodated on the ejected original tray 28.

The next document feeding operation is performed when the sensor 71 detects the trailing edge of the document twice.

Here, the paper copied in the copying machine 12 is ejected as it is in the case of single-sided copying, and is temporarily held in the copying machine 12 in the case of double-sided copying, and is then placed on the back side of the paper with the front and back reversed. The image of the original document is copied.

<Effects of Embodiment> According to the above-described embodiment, the driven roller 72, which is driven by the conveyance roller 70 and rotates forward and backward in accordance with the document conveyance direction, has the angular axis 73 inserted therein and the angular axis 73 depending on the document conveyance direction. A bearing portion 75 having holes 74 with different engagement angles with respect to a rotating portion 76 which comes into contact with a conveyed document and rotates with respect to the bearing portion 75 by the movement of the document.
When the conveyance roller 70 rotates counterclockwise, it rotates in the state shown in FIG. 4 to convey the original straight, and when the conveyance roller 70 rotates clockwise, it rotates in the state shown in FIG. Can be conveyed diagonally.

Therefore, when the document conveyance direction is reversed in the conveyance direction changing path 65, the document conveyance angle before and after the conveyance direction is reversed without releasing the pressure contact between the conveyance roller 70 and the driven roller 72, which rotate in the forward and reverse directions. The aligning can be performed with a simple configuration that can be different.

(Modification)

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and the following modifications can be made.

(1) In the above embodiment, the automatic document feeder is shown as the sheet conveying device, but it can be applied to an image processing device having a switchback path for copying on both sides of a sheet.

[Effect of device]

In short, the present invention is provided with the conveying roller which is driven in the forward and reverse directions and the driven roller which is rotated in pressure contact with the conveying roller. The sheet is nipped and conveyed between the conveying roller and the driven roller, In a sheet conveying device for reversing the sheet conveying direction by forward and reverse driving of a conveying roller, a driven roller supporting shaft for supporting the driven roller is provided, and the driven roller is inserted with the driven roller supporting shaft. A shaft hole having a large hole portion having a large displacement in the sheet conveying direction with respect to the roller support shaft and a small hole portion having a small displacement in the sheet conveying direction with respect to the driven roller support shaft is provided, and follows the sheet conveyed by the conveying roller. A bearing portion for displacing the engagement angle between the driven roller support shaft and the shaft hole in the sheet conveying direction is brought into contact with the conveying sheet to convey the sheet. Since it is composed of a rotating part that rotates with respect to the bearing part when the sheet moves, the angle of the driven roller with respect to the driven roller support shaft differs depending on the sheet conveying direction, and when the sheet conveying direction is reversed It is possible to obtain a sheet conveying apparatus capable of changing the conveying angle of a sheet before and after reversing the conveying direction without releasing the pressure contact between the conveying roller and the driven roller.

[Brief description of drawings]

1 to 6 are views showing an embodiment of the present invention. FIG. 1 is a copying machine of an automatic document feeder to which the present invention is applied.
FIG. 2 is a sectional view showing the structure of the separating portion of the automatic document feeder, FIG. 3 is a plan view of the driven roller, and FIG. 4 is a sectional view of the driven roller. Fifth
FIG. 6 is a bottom view of the driven roller, and FIG. 6 is a sectional view of the driven roller showing a state different from that of FIG. 10 ...... Automatic document feeder, 12 ...... Copier, 14 ...... Separator, 16 ...... Conveyor, 22 …… Document tray, 28 …… Paper output tray, 65 …… Conveyance direction change path, 70 …… Conveyor rollers, 72 ...
… Driven roller, 73 …… Square shaft, 75 …… Bearing section, 76 …… Rotating section

Claims (1)

(57) [Scope of utility model registration request] 1. A conveyance roller which is driven in forward and reverse directions, and a driven roller which is rotated in pressure contact with the conveyance roller. A sheet is nipped and conveyed between the conveyance roller and the driven roller, and the conveyance is performed. In a sheet conveying device for reversing a sheet conveying direction by forward / reverse driving of a roller, a driven roller support shaft for supporting the driven roller is provided, and the driven roller is inserted with the driven roller support shaft. A shaft hole having a large hole portion with a large displacement in the sheet conveying direction with respect to the support shaft and a small hole portion with a small change in the sheet conveying direction with respect to the driven roller support shaft is provided, and follows the sheet conveyed by the conveying roller. The bearing portion that displaces the engagement angle between the driven roller support shaft and the shaft hole in the sheet conveying direction and the bearing sheet that comes into contact with the conveying sheet and moves the conveying sheet. A sheet conveying device comprising: a rotating portion that rotates with respect to the bearing portion by a motion.