JPH03152045A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To improve accuracy of conveyance of sheets through execution of reliable registration of sheets by providing an escape preventing means to prevent the escape of a sheet from a shutter when the sheet is collided with the shutter. CONSTITUTION:A sheet 6 is transfer by means of transfer means 27, 33, and 50 each time occasion demands, and is then transferred in a right angled direction by means of a second transfer means. In this case, transfer means 21, 22, 36, and 39 receive the sheet 6 in a first position connected to the first conveying means 27, 33, and 50 and the sheet is moved to a second position connected to the second conveying means, and the sheet 6 is conveyed in a right angled direction. During transfer of a sheet by means of the first transfer means 27, 33, and 50, the tip of the sheet 6 is collided with a shutter 51 to register the sheet 6. In this case, the sheet is prevented from an escape from the shutter 51 by means of an escape preventing means 60.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a sheet conveying device, and more particularly to a manual feed mechanism in an image forming apparatus.

(B) Prior Art A conventional electronic copying machine 100 is shown in FIG. The sheet 102 fed from the manual paper feed tray 101 by turning it sideways is fed to paper feed rollers 103, 105. It is conveyed by registration rollers 106 and transferred to transfer guides 107,1.
09, the image on the drum 110 is transferred and separated by transfer separation chargers 111 and 112, and transferred to a conveyance section 113.
The toner image is fixed by the fixing roller section 115, and the sheet is conveyed in a fixed direction until it is finally discharged to the paper discharge tray 116.

In addition, in the case of multiple image formation, after the fixing is completed, the fixing unit 11
The sheet 102 exiting the drum 110. The image is sent to the fixing roller section 115. In the case of double-sided image formation, the discharge roller 120 reverses the sheet 102 while it is being discharged by the discharge roller 120, and the sheet is guided by the paper deflecting plate 117, passes through the conveyance path 119, and is sent to the drum 11o. .

That is, the manual paper feed tray 101 and the double-sided multiplexing sheet conveyance path 119 were provided independently.

For this reason, a manual paper feed device that eliminates the space on the right side occupied by the manual paper feed tray 101, feeds the sheet 102 from the front of the electronic copying [100] to the sheet transport path 119 for double-sided multiplexing, and shares the sheet transport path 119. has been devised.

(8) Problems to be Solved by the Invention However, when the manual paper feed tray 101 and the sheet conveyance path 119 for double-sided multiplexing are on the same surface or when each is fixed, the sheets cannot be conveyed in directions perpendicular to each other. There is a problem in that the mechanism for releasing the conveyance of each conveyance means becomes cumbersome.

Further, when sheets are conveyed in directions perpendicular to each other, there is a problem in that the accuracy of sheet conveyance becomes poor unless the posture of the sheets is effectively regulated (registered).

Therefore, the present invention provides a transfer means that receives a sheet from the first conveyance means at the intersection of the first and second conveyance means that are orthogonal to each other, moves the sheet to the second conveyance means, and conveys the sheet; It is an object of the present invention to provide a sheet conveying device that is provided with a shutter that abuts the sheet so that the sheet does not deviate from a transfer means, and that can improve sheet conveyance accuracy with a simple mechanism.

(d) Means for solving the problem The present invention has been made in view of the above circumstances, and includes:
For example, referring to FIG. 1, FIG. 2, and FIG. Transport means (27,3
a second conveyance means (20, 2) for conveying the sheet (6) in a direction perpendicular to the sheet conveyance direction by
3), in which the first conveying means (27, 33, 50) and the second conveying means (2) are provided.
0, 23), the first conveying means (27, 33)
, 50) to receive the sheet (6) and a second position connected to the second conveying means (20, 23) to convey the sheet (6). A moving transfer means (21, 22, 36, 39) is provided, and on the downstream side of the transfer means (21, 22, 36, 39), the first transfer means (27, 33, 50) carries The shutter (5) is positioned when the leading edge of the sheet (6) abuts against it.
1), and when the sheet hits the shutter (51).

Deflection prevention means (60
, 61, 63).

(E) Function Based on the above configuration, the sheet (6) is transported by the first transport means (27, 33, 5, 0) whenever necessary, and then perpendicularly transported by the second transport means (20, 23). transport in the direction. At this time, transfer means (21, 22, 36, 39)
or at a first position connected to the first conveying means (27, 33, 50) for receiving the sheet (6), and then at a second position connected to the second conveying means (20, 23). and conveys the sheet (6) in the orthogonal direction.

Further, when the sheet (6) is conveyed by the first conveying means (27, 33, 50), the leading end of the sheet (6) is brought into contact with the shutter (51), and the sheet (6) is
) to resist. At this time, the deflection prevention means (60, 61
, 63) prevent it from deviating from the shutter (51).

Note that the symbols in parentheses are just examples and do not limit the configuration in any way.

(f) Example Hereinafter, embodiments will be described with reference to FIGS. 1 to 5.

In FIG. 3, 1 is a copying machine equipped with a manual feed slot 2, an openable/closeable manual feed tray 3, and a cassette 5 on the front.
That is, it is formed as a front loading type. Then, as shown in FIG. 4, the sheets 6 stored in the cassette 5 are separated by the pickup roller 7 and fed, and then conveyed to the registration rollers 10 by the conveyance rollers 9. The registration rollers 10 position the sheet 6 in synchronization with the image formed on the drum 11, and the sheet 6 is conveyed at a predetermined timing. Then, the image on the drum 11 is transferred to the sheet 6 by the charger 12, and the sheet 6 is further separated from the drum 11 by the separation charger 13, and transported to the fixing unit 16 by the transport unit 15.
This fixing section 16 fixes the image. Then, the sheet 6 on which a single image is to be copied on one side is discharged by a paper discharge roller 17.

Further, when most of the sheet 6 on which a double-sided image is to be copied is discharged by the paper discharge roller 17, the paper discharge roller 17 is reversed, guided downward by the flapper 19, and fed into the double-sided multiple path 20. .

Further, a sheet material 6 on which a single-sided multiple image is to be copied is fed into a guide 20 by a flapper 19.

Then, the sheet 6 on which double-sided and single-sided multiple images are to be copied is sent through a pair of guide plates 21 and 22 to the registration roller 1o again by the paper refeed roller 23, where a predetermined copying operation is performed.

Next, the configuration of the relationship between manual sheet feeding from the front and sheet conveyance for duplex and multiplexing will be explained.

In FIG. 2, reference numerals 21 and 22 denote a pair of square-shaped upper and lower guide plates explained in FIG. Also,
Reference numeral 26 denotes a manual tray guide, which is fixed inside the main body so that its surface is flush with the opened external manual tray 3 (see FIG. 3). Following the manual tray guide 26, a lower guide 27 is fixed to the main body, and an upper guide 29 is fixed above the lower guide 27, respectively. Further, below the manual tray guide 26 and the lower guide 27, a pressurizing arm 31 is pivotally supported by a pin 30 fixed to the main body, and as shown in FIG. It is moved up and down by an eccentric cam 32 driven by a pulse motor or the like. In addition, this pressurizing arm 3
A driven manual feed roller 3 is biased upward on the back side of 1.
3 is attached, and a push-up piece 35 for pushing up the guide plate 22 is provided at the rear end. Further, a paper refeed conveyance drive roller 36 is provided on the main body so as to be rotatable about a longitudinal axis, and is turned on and off via a clutch from a drive source (not shown). This paper refeed conveyance drive roller 3
6 is provided with a hole 37 passing through the guide plate 22,
A paper refeed conveyance driven roller 39 facing above the drive roller 36 is formed integrally with the shaft 40 . This shaft 40
Both ends of the bracket 41 are guided through elongated holes 42 in the vertical direction of a bracket 41 fixed to the guide plate 21, and the shaft 40, that is, the driven roller 39, is biased downward by a tension spring 43. A hole 45 through which the hole 39 passes through the guide plate 21 is provided in the guide plate 21 . Also, axis 4
A roller release arm 46 having a locking portion below o is pivotally supported by a pin 47 fixed to the guide plate 21, and the other end 46a of this arm 46 is attached to the lower surface of a protrusion 49 fixed to the main body. It is designed to be locked. A manual paper feed roller 50 is rotatably supported above the upper guide 29, and the roller 50 is rotationally driven by a pulse motor or the like (not shown). The surface of the roller 50 protrudes below the upper guide 29 and is in pressure contact with the manual paper feed roller 33.

Note that a reference guide surface 57 for the manual sheet 6 is formed perpendicularly to the right side of the manual sheet guide 26 .

Next, the structure of the regulating means for regulating the movement of manual paper feed will be explained with reference to FIGS. 1 and 2.

The front end of the guide plate 21 is bent upward at a substantially right angle to form a shutter member 51, the upper end of which is bent into a stop piece 60, A protrusion 61 is formed on the side. The shutter member 51 is provided with a sensor lever 52 that comes into contact with the end of the sheet material 6 when the sheet 6 abuts against the shutter member 51 . A photo interrupter 53 that is detected by the sensor lever 52 is provided as a set with the sensor lever 52, and a sensor lever 55 that detects the rear end of the manual sheet 6 and its photo interrupter 56 are provided as a set on the upper guide 29. It is set up as follows.

Note that, as shown in FIG. 5, the pair of manual paper feed rollers 33.
A reference numeral 50 is provided within a region C through which the sheet 6 passes when double-sided/multiple copying is performed. The limit line of this area is indicated by a dashed line.

Next, the operation of manual paper feeding will be explained.

As shown in FIG. 4(a), when double-sided multiple copying is being performed, the pressure arm 31 is supported at a position where the amount of eccentricity of the eccentric cam 32 is minimum and is lowered. For this reason, the push-up piece 35 provided at the rear end of this pressurizing arm 31
The left end portions of the guide plates 21 and 22 supported by the manual tray guide 26 are located below the upper surface of the manual tray guide 26, and
1 crosses the upper surface of the lower guide 27. Further, in this position, the paper refeed conveyance rollers 33 and 36 normally perform the paper refeed operation. That is, due to double-sided multiple copying, the manual feed rollers 33, 50 located in the area C through which the sheet 6 passes do not interfere with the sheet 6 being re-fed.

In the above state, after confirming that duplex/multiple copying is not activated, the operator opens the manual feed tray 3, which also serves as a cover, in the direction of the arrow, and inserts the sheet 6 from the manual paper feed slot 2 onto the reference guide surface. 57 until it hits the shutter member 51, the sheet 6 is gently bent upward by the protrusion 61 and the tip 63 of the lower guide 27, and the tip of the sheet 6 touches the shutter member 51. 51, but is prevented from deviating upward from the shutter member 51 by the stopper piece 60. Further, since the sheet 6 is curved upward, it does not curve downward and enter between the guide plates 21 and 22 like the sheet 6 indicated by the dotted line.

A manual feed start signal is issued using a button (not shown). Sheet material 6
When the tip of the sensor lever 52 is pressed, the device is switched to manual feed mode.

Next, in response to this signal, the control section (not shown) rotates the eccentric cam approximately 180 degrees, and when the pressure arm 31 is raised, the guide plate 21.2 is moved by the push-up piece 35 (see FIG. 2).
2 rotates upward around the pin 25, and the guide plate 22
The upper surface is held slightly lower than the upper surface of the lower guide 27 (at this time, the pressure arm 31 and the dimensions of the eccentric cam 32 are set),
The manual paper feed roller 33 is pressed against the manual paper feed drive roller 50 by an upward biasing force via the manual sheet material 6 that was in contact with the shutter member 51, and the shutter member 51 is pushed upward toward the guide plate 21. evacuate with. At this time, it faces either the nip portion between the roller 33 and the roller 50, or the guide portion of the guide plate 21, 22 that has rotated upward. At the same time, the other end 46a of the roller release arm 46
, the rear side of the roller release arm 46 rises, and the shaft 40 is lifted up against the downward biasing force of the tension spring 43. evacuate upwards. At the same time, roller 39 separates from roller 36.

A signal is issued when the eccentric cam 32 completes rotation of approximately 180 degrees, and upon receiving this signal, the control unit drives the manual feed roller 50 to direct the manual sheet 6 toward the back at a predetermined speed. and transport it.

Then, after the trailing edge of the sheet 6 is detected by the sensor beam and interrupters 55 and 56, the manual paper feed rollers 33 and 50 stop after being conveyed a predetermined amount. Due to this movement, the rear end of the manual sheet 6 matches the limit line of the area C described above.

Next, upon receiving a signal that the drive source for driving the manual paper feed drive roller 50 has stopped, the control section turns on the drive source for the eccentric cam 32 to almost start rotating, and the pressure arm 31 starts to descend. do. Here, the guide plates 21, 22 are made to rotate as little as possible around the bin 25,
If the manual feed roller 33 is locked to the pressure arm 31 by a guide such as a long hole in the vertical direction, the fifth
At the beginning of the transition from the state shown in FIG. 5(b) to the state shown in FIG. 5(c), a state in which the rollers 33 and 50 and the rollers 36 and 39 are in pressure contact at the same time occurs, preventing the sheet 6 from being disturbed in its posture. be done. Then, the state returns to the same state as described with reference to FIG. 5(a). However, the sheet 6 is held between the re-feed and transport lower parts 36 and 39.

Next, upon receiving a signal that the drive source of the eccentric cam 32 has stopped (a predetermined pulse may be counted, or a means for detecting the rotation angle may be provided on the cam 32), the control unit starts refeeding the paper. The conveyance rollers 36 and 39 are driven to convey the manual feed sheet material 6 in a direction perpendicular to the manual feed direction (in the direction of arrow B), and then the image is transferred by the refeed roller 23 (see FIG. 3) and the registration roller 10. It is conveyed to a forming area (area of drum 11, fixing section 16, etc.).

(g) As described in detail, according to the present invention, the transfer means receives the sheet at the first position connected to the first conveyance means, and receives the sheet at the second position.
Since the sheet is transported in the orthogonal direction at the second position connected to the transport means, the transport state of the transport means can be adjusted by engaging and disengaging the constituent members as the transport means moves. The operating mechanism can be simplified.

Further, since the sheet reliably hits the shutter by the deflection prevention means, the registration of the sheet can be ensured and the accuracy of sheet conveyance can be improved.

Furthermore, for example, in a copying machine, etc., since a part of the double-sided multiple paper refeeding path is used for the second conveyance means, the front manual feeding system can be configured to be compact, and there is no need for manual feeding space on the side. This makes it possible to downsize the copying machine and significantly reduce the installation space.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the relationship between a guide and a guide plate in an embodiment of the present invention, FIG. 2 is a perspective view of the vicinity of the guide plate, FIG. 3 is a perspective view of a copying machine implementing the present invention, and FIG. The figure is the third
Fig. 5 is an explanatory diagram of the operation of the guide plate, Fig. 6 is a longitudinal sectional front view of the figure.
The figure is a longitudinal sectional front view of a conventional manual paper feed copying machine. 6...Sheet 20.23...Second conveyance means (double-sided multiple passes, paper refeed roller) 27.33.50...First conveyance means (lower guide, paper refeed conveyance drive roller, Followed roller) 51...Shutter (shutter member) 60.61.61... Deflection prevention means (stopping piece, protrusion, tip)

Claims (1)

[Scope of Claims] 1. A first conveying means that feeds the sheet as needed, and a second conveying means that conveys the sheet in a direction perpendicular to the direction in which the sheet is conveyed by the first conveying means. a means of transport;
A sheet conveying device comprising: a first position connected to the first conveying means to receive the sheet, and a first position connected to the first conveying means to receive the sheet, and a first position connected to the first conveying means to receive the sheet; A transfer means that is connected to and moves between a second position and a second position for conveying the sheet is provided, and a leading end of the sheet conveyed by the first conveyance means abuts on the downstream side of the transfer means. 1. A sheet conveying device, comprising: a shutter for positioning; and a deflection preventing means for preventing the sheet from deflecting from the shutter when the sheet abuts against the shutter.