JPS644763Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a copy paper reversing device in a double-sided copying machine.

(Prior Art) A double-sided copying machine is equipped with a sheet reversing device in order to re-copy the back side of copy paper that has already been copied on one side. and single-sided copy mode, and operate differently.

FIG. 1 shows a conventional sheet reversing device, in which solid lines indicate a non-reversing operating state in a single-sided copying mode, and chain lines indicate a reversing operating state in a double-sided copying mode. Reference numeral 1 denotes a first conveyance roller, which rotates in the direction of arrow A. 2 and 3 are the second,
These are third conveyance rollers, and are in rolling contact with the first conveyance roller 1 at all times. The second conveyance roller 2 is rotated by a shaft 7 on a lever 4 (there is a pair of levers, one in the front and one in the back), which is loosely fitted and pivotally supported on the shaft 6 of the first conveyance roller 1. freely supported. A cam follower 9 is attached to the extension of the lever 4.
is provided, which is in rolling contact with the cam surface of the cam 10. The third conveyance roller 3 is rotatably supported by a shaft 8 on a lever 5 that is loosely fitted and pivotally supported on the shaft 6 of the first conveyance roller 1 . Lever 5
A cam follower 12 is also provided in the extension of the
It is in rolling contact with the cam surface of the cam 13 fixed to the shaft 11 of the cam 10.

In the state shown by the solid line, the cam followers 9, 1
2 are in contact with the valleys of the cams 10, 13, respectively, so both the levers 4, 5 are closed, and the second conveyance roller 2 and the third conveyance roller 3 are in the position close to each other when the first conveyance roller They are in rolling contact with the roller 1, respectively. Therefore, the copy paper that has been guided near the circumferential surface of the first conveyance roller 1 by the carry-in guide plate 14 passes through the rolling contact portion of the second conveyance roller 2 and is immediately transferred to the third conveyance roller. 3, and is discharged onto the discharge guide plate 15 without being reversed.

In order to achieve the reverse operation state shown by the chain line, cam 1
Rotate the axis 11 of 0,13 about 180 degrees. As a result, the cam followers 9 and 12 ride on the peaks of the cams 10 and 13, the levers 4 and 5 are spread apart, and the second conveyance roller 2 and the third conveyance roller 3 are moved to positions apart from each other. However, the rolling contact state is maintained with respect to the first conveyance roller 1. Therefore, when the single-sided copy paper that has been guided by the carry-in guide plate 14 and reaches the vicinity of the circumferential surface of the first conveyance roller 1 passes through the rolling contact portion with the second conveyance roller 2, it is transferred to the reversing guide. It ascends within the course formed between the plates 16. When the trailing edge of the copy paper leaves the second conveyance roller 2, it makes a switch turn, and this time, the trailing edge becomes the tip and heads toward the rolling contact portion of the third conveyance roller 3. As a result, the single-sided copy paper is discharged from the rolling contact portion of the third conveyance roller 3 onto the discharge guide plate 15 with its leading edge and trailing edge, front and back surfaces reversed, respectively. The copy sheet is then directed to an intermediate tray (not shown) and is prepared for backside copying.

By the way, in order to keep the second and third conveyance rollers 2 and 3 in rolling contact with the first conveyance roller 1, the levers 4 and 5 are set so that they revolve around the shaft 6 of the first conveyance roller 1. Since it is supported, it cannot be separated from the first conveyance roller 1. Therefore, if the copy paper becomes jammed in this sheet inversion device, it is difficult to remove it.

(Objective) The present invention aims to eliminate the above-mentioned drawbacks, that is, to facilitate the removal of jammed paper generated within a sheet reversing device.

(Structure) The structure of the present invention will be described below based on one embodiment.

In order to achieve the above object, the present invention has the following features:
a conveyance roller, and a second roller, which is in rolling contact therewith,
a non-reversing operating state in which the second and third transport rollers occupy positions close to each other; and a non-reversing operating state in which they occupy positions apart from each other; In a sheet reversing device capable of switching between a reversing operation state and a reversing operation state in which a path is formed for the sheet reversing operation, the first conveying roller is pivotally supported on the main unit, and the second conveying roller is attached to a lever that is pivotally supported on the movable unit. , a rotary plate for swinging the lever is provided, a lever interlocked with the lever is pivotally supported on a movable unit, a third conveyance roller is attached to the lever, and the second and third conveyance rollers are rotated by the first conveyance roller. They are constantly pressed together by a spring so that they occupy a necessary reversal operation state position where they are close to each other and a reversal operation state position where they are spaced apart.

FIG. 2 and subsequent figures show an embodiment of the present invention. The first conveyance roller 1 is supported by the main unit 17 and is rotationally driven in the direction of arrow A. The movable unit 18 that supports the second and third transport rollers 2 and 3 is pivotally supported using the shaft 20 of the paper discharge roller 19, and can be opened as shown in FIG. As shown in the figure, the second,
The third conveyance rollers 2 and 3 are the first conveyance roller 1
It is locked in the operating position where it makes contact.

As shown in FIG. 3, the second conveyance roller 2 is supported by a first arm 22a of a three-pronged lever 22 that is pivotally supported by a shaft 21 on the movable unit 18, and the third conveyance roller 3 is It is supported by a first arm 24a of a two-pronged lever 24 which is pivotally supported by a shaft 23 at 18. Shafts 7 and 8 of both conveyance rollers 2 and 3
are supported so as to be movable in parallel in the direction connecting them to the axes 21 and 23, respectively, and
A biasing force toward the first conveyance roller 1 is applied by springs 25 and 26 . The second arm 22b of the three-pronged lever 22 and the second arm 24b of the two-pronged lever 24 are connected by an elongated hole 27 and a pin 28. Third arm 22c of trifurcated lever 22
The movable unit 18 has a long hole 29 provided therein.
It is engaged with a pin 30 implanted in a rotary plate 31 supported by.

The movable unit 18 includes reversing guides 32 and 33 made of wire and arranged between the second and third conveyance rollers 2 and 3. Double reversal guide 3
A reversing passage extending upward is formed between 2 and 33, and a reversible drive roller 34 and a pinch roller 35 are disposed sandwiching the reversing passage. The lower end of the left reversing guide 32 is bent leftward from the peripheral edge of the second conveyance roller 2, and forms a carry-in passage 35a between it and a lower guide plate 34a disposed on the main unit 17. The lower end of the right reversing guide 33 reaches the peripheral edge of the third conveyance roller 3 and is bent to the right there. The main unit 17 has a return guide plate 3 with its upper end facing the periphery of the first conveyance roller 1.
6 are arranged. A switching guide piece 38 is rotatably provided at the entrance of the return guide plate 36, and connects a discharge path from the circumferential surface of the first conveyance roller 1 to the paper discharge roller 19 and a return guide plate 36.
and a re-copying path toward the intermediate tray 37.

Next, the operation of the sheet reversing device will be explained.

The state shown in FIG. 3 shows the state after backside copying in single-sided copying mode or double-sided copying mode, that is, the non-reversing operation state. In this state, the rotary plate 31 is in the position where the pin 30 has descended, so the three-pronged lever 22 is in the most counterclockwise rotated position, and the two-pronged lever 24 interlocked with it is in the most counterclockwise position. It is in a clockwise rotated position. Therefore, since the second conveyance roller 2 and the third conveyance roller 3 roll into contact with the first conveyance roller 1 in a state where they are close to each other, the copy paper that has advanced from the carry-in path 35a is transferred to the second conveyance roller 2, The sheet passes through the rolling contact portion of the third conveyance rollers 2 and 3 as it is, is directed toward the sheet discharge roller 19 by the switching guide piece 38, and is discharged without being reversed.

When the rotating plate 31 is rotated approximately 180 degrees, the pin 30
moves to the raised position shown by the chain line, the three-pronged lever 22 rotates clockwise, and the two-pronged lever 24 rotates counterclockwise, causing the second conveyance roller 2 and the third conveyance roller 3 to rotate. move to the positions indicated by chain lines, where they come into rolling contact with the first conveyance roller 1. That is, the second conveyance roller 2 and the third conveyance roller 3 are in a reversing operation state where they are separated from each other. Therefore, when the copy paper that has been copied on one side and has been advanced from the carry-in passage 35a passes through the rolling contact portion between the first conveyance roller 1 and the second conveyance roller 2, it is moved upward within the reversing guides 32 and 33. is held between a reversible drive roller 34 and a pinch roller 35,
They continue to rise due to their rotation. When the trailing edge of the copy paper finishes passing through the rolling contact section, the reversible drive roller 34
As a result of the reversal of , it switches and descends, and advances to the rolling contact portion of the first and third conveying rollers 1 and 3 with the original rear end first. The copy paper that has been copied on one side after leaving the transfer section is guided by the switched switching guide piece 38, passes through the return guide plate 36, and heads toward the intermediate tray 37, where it is ready for copying on the back side.

During the switching operation by rotating the rotary plate 31, the second and third conveyance rollers 2 and 3 revolve around the shafts 21 and 23, so that the shafts 7 and 8 are connected to the three-pronged lever 22 or If it is immovably supported by the bifurcated lever 24, it will be blocked by the first conveyance roller 1 and cannot be switched. However, since the shafts 7 and 8 can be retracted while being biased by the springs 25 and 26,
The second and third conveyance rollers 2 and 3 can move without being hindered by the first conveyance roller 1 while rolling in contact with it.

When the copy paper becomes jammed in the sheet reversing device, the movable unit 18 is opened as shown in FIG. As a result, the second and third conveyance rollers 2 and 3 are separated from the first conveyance roller 1.
The jam paper 39 can be easily removed. The jam generated between the reversing guides 32 and 33 can be easily removed since it is made of wire.

(Effects) As described above, the present invention has a non-reversing operating state in which the rollers are in rolling contact with the first conveying roller and are close to each other.
a second, which is switched to a mutually spaced inverted operating state;
The third conveyance roller is provided as a separate unit from the first conveyance roller, and both units are connected so that they can be opened, so even if a jam occurs in the sheet reversing device, both units can be opened. By doing so, it can be easily removed. The second and third conveyance rollers
Since it is in elastic contact with the conveyance roller, when changing its rolling contact position, the first conveyance roller
Does not interfere with switching operations.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional sheet reversing device;
3 and 3 are front views showing an embodiment of the present invention, with FIG. 2 showing the movable unit in the open state and FIG. 3 showing the movable unit in the closed state. DESCRIPTION OF SYMBOLS 1...First conveyance roller, 2...Second conveyance roller, 3...Third conveyance roller, 17...Main unit, 18...Movable unit, 22...3-pronged lever, 24...2-pronged Lever, 25, 26...
Spring, 31... rotating plate.

Claims (1)

[Scope of utility model registration request] It comprises a first conveyance roller, and second and third conveyance rollers that are in rolling contact with the first conveyance roller, respectively, and the second and third conveyance rollers are provided with
a non-reversing operating state in which the transport rollers occupy positions close to each other, and a state in which they occupy positions apart from each other
In a sheet reversing device that can be switched between a reversing operation state and a reversing operation state in which a path for switching the sheet is formed between them, the first transport roller is pivotally supported by the main unit, and the second transport roller is supported by the main unit. A rotating plate is attached to a lever pivotally supported on a movable unit, and a rotary plate is provided for swinging the lever, a lever interlocking with the lever is pivotally supported on the movable unit, a third conveying roller is attached to the lever, and a second and a third conveying roller are attached to the lever. A sheet reversing device in which the conveyance roller is constantly pressed by a spring so that the conveyance roller is in rolling contact with the first conveyance roller and occupies a non-reversing operating state position where they are close to each other and a reversing operating state position where they are separated from each other.