JPH0479936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document conveying device used in a copying machine.

[Background of the invention]

Conventionally, an original was constructed in such a way that the original was drawn onto the original glass using a conveyor belt that rotated forward and backward over the original glass, and then conveyed in the reverse direction so that the trailing edge of the original came into contact with the stepped part of a scale plate provided at the edge of the original glass. Transport equipment was provided. In the case of this type of document feeder, when feeding a document from the document feeder, a gap is created between the conveyor belt and the scale plate step provided at the edge of the document glass to allow the document to pass through, and the document is conveyed in the reverse direction. It is necessary to construct such a structure that the gap can be closed when the scale plate is brought into contact with the stepped portion of the scale plate.
As a means for this purpose, Japanese Patent Application Laid-Open No. 58-21762 discloses that a belt presser roller is pivotally supported at the swinging end of a lever that can swing vertically about the axis of the drive roller of the conveyor belt as a fulcrum; The conveyor belt is biased downward by a spring, and when the conveyor belt rotates in the forward direction, the roller is moved upward against the spring, and when the conveyor belt is rotated in the reverse direction, the roller is moved downward using the spring force.

However, in the above case, the mechanism is complicated, and the installation position of the belt presser roller must be set with high precision, as the relative condition between the drive roller axis of the conveyor belt and the step of the scale plate is important. The above functions could not be fully demonstrated. Also,
In the above case, if the spring force that urges the belt presser roller downward is strong, it will be difficult to create the gap when the conveyor belt rotates forward, and if it is weak, the effect of closing the gap will be lost, making it difficult to adjust. Ta.

[Purpose of the invention]

This invention is intended to solve the above-mentioned problems, and it is possible to reliably form and close the gap between the conveyor belt and the stepped portion of the scale plate with a simple configuration.
Moreover, it is an object of the present invention to provide a document conveying device that is not affected by the relative conditions between the drive roller and the scale plate stepped portion.

[Structure of the invention]

In order to achieve the above object, the present invention is capable of forward and backward rotation on the original glass, and when the original is rotated in the normal direction, the original is drawn from the paper feed section onto the original glass, and when the original is rotated in the reverse direction, the scale plate provided at the end of the original glass on the paper feeding side is provided. In a document conveying device equipped with a conveyor belt that can bring the trailing edge of a document into contact with a stepped section, rotate normally again after exposure, and discharge the document to a paper discharge section, a paper feed side and a discharge section that press the lower running surface of the conveyor belt are used. Of the belt press rollers on the paper side, the belt press roller on the paper feed side is moved between a point directly above the scale plate stepped portion and a point ahead of it in the document feeding direction in conjunction with forward and reverse running of the conveyor belt. Bearing as possible. This allows you to simply rotate the conveyor belt in the forward and reverse directions.
The structure is such that a gap can be formed or closed between the conveyor belt and the stepped portion of the scale plate.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

In the figure, 1 is the main body of the copying apparatus, and 2 is a document conveying device. As shown in the second diagram, the document conveyance device 2 includes a forward and reverse reversible conveyance belt 4 installed close to the document glass 3 on the main body 1 of the copying apparatus, a paper feed unit 5 at one end of the conveyance belt 4, and a paper feed unit 5 at the other end. A paper discharge unit 6 is provided.

The paper feed unit 5 feeds the document 8 on the document tray 7.
A first sheet feeding section 5a for separating the documents from the upper layer one by one and sending them out, and a second sheet feeding section 5b for feeding the documents sent out by the first sheet feeding section 5a to the conveyor belt 4, A frame 9 holding a frame 9 is screwed to the copying apparatus main body 1 and covered with an exterior frame 10.

The conveyor belt 4 is supported by bearing plates 13 fixed to both side walls on the base side and the tip side of an exterior frame 12 attached to a hinge unit 11 with a built-in free stop mechanism that is pivotally supported by the frame of the paper feed unit 5. It is stretched between the drive roller 14 and the driven roller 15, and can be rotated in forward and reverse directions by a forward and reverse rotation motor (not shown). The upper running surface of the conveyor belt 4 is pressed by tension rollers 16 and 17 bearing on the bearing plate 13, and the lower running surface is pressed by a belt pressing roller 19 bearing on a bearing member 18 attached to the bearing plate 13. , 20.
Of the belt press rollers 19 and 20, the bearing member 18 of the belt press roller 19 on the drive roller 14 side
is a point p directly above the stepped portion 22 of the scale plate 21 fixed to the paper feed side end of the original glass 3 by the roller 19;
It is configured to be able to move substantially horizontally between the point p and a point p' forward in the sheet feeding direction in conjunction with the running of the conveyor belt 4. That is, when the conveyor belt 4 rotates normally in the direction of the arrow a as shown in FIG.
It moves to point p' and moves away from the stepped portion 22 of the scale plate 21. Therefore, a gap 23 is formed between the conveyor belt 4 and the scale plate stepped portion 22, through which the original 8 can pass. Furthermore, when the conveyor belt 4 is reversed and runs in the direction of arrow b as shown in FIG. 6, the belt pressing roller 19 also moves in the same direction (direction of arrow b').
It moves to point p and closes the gap 23.

Also, the belt pressing roller 2 on the driven roller 15 side
Although the details of the bearing member 18 are not shown in the drawings, the bearing member 18 is configured to be able to move the roller 20 diagonally up and down in conjunction with the running of the conveyor belt 4. That is, when the conveyor belt 4 rotates in the normal direction, the roller 20 moves upward to lift the conveyor belt 4 above the document glass 3, making it easier to eject the document, and when the conveyor belt 4 rotates in the reverse direction, the roller 20 moves downward to prevent the conveyor from being conveyed. The belt 4 is brought into close contact with the original glass 3, and functions to securely press the original against the glass surface after abutting against the stepped portion of the scale plate, and to accurately stop the original at a position on the side of the scale plate.

The height of the belt presser roller 18 with respect to the document glass 3 can be adjusted by an adjustment member 24 provided between the hinge unit 11 and the exterior body 12 to which the mounting plate 13 to which the bearing member 21 is fixed is attached. It's getting old. 25 is a reference member for setting the distance between the conveyor belt 4 and the document glass 3 when operating the adjusting member 24;
It is attached to the bearing member 18 on the fourth side. Reference numeral 26 denotes a protrusion for setting the height of the belt presser roller 20 on the driven roller 15 side from the original glass surface. It is provided.

The paper discharge unit 6 includes a scooping plate 27 that scoops up the original 8 sent by the conveyor belt 4 rotating around the driven roller 15 on the leading end side of the exterior body 12, and a guide roller 28 that pinches and transports the scooped original. A curved guide member 30 that reverses the document that has passed through the guide roller 28 and guides it to the paper discharge port 29;
A paper discharge roller 31 is provided near the vicinity opening 29 of 9, so that the original after copying can be reversely discharged onto a discharge tray 32 provided on the upper surface of the exterior body 12.

〔Effect of the invention〕

As described above, the present invention allows forward and reverse rotation on the document glass, and when the document is rotated in the normal direction, the document is drawn from the paper feed section onto the document glass, and when it is reversed, the document is drawn into the scale plate stepped portion provided at the paper feed side end of the document glass. In a document conveying device that includes a conveyor belt that abuts the trailing edge of the document and rotates forward again after exposure to discharge the document to a paper discharge section, a paper feed side and a paper discharge side that include a lower running surface of the conveyor belt. Among the belt press rollers, the belt press roller on the paper feeding side is movable in conjunction with forward and reverse running of the conveyor belt between a point directly above the stepped portion of the scale plate and a point ahead of it in the document feeding direction. It features an operation that creates a gap between the conveyor belt and the step part of the scale plate when feeding the original from the document feeder, and a function that creates a gap between the conveyor belt and the stepped part of the scale plate when the original is conveyed in the reverse direction. It becomes possible to reliably close the gap when abutting against each other with a simple configuration. In addition, unlike conventional devices, this invention has a bearing independent of the drive roller, so it achieves various excellent effects such as being unaffected by the relative conditions between the drive roller shaft and the stepped portion of the scale plate. It is.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is an external perspective view, Fig. 2 is a sectional view, Fig. 3 is a partially cutaway front view, Fig. 4 is a perspective view of the main part, Fig. 5, FIG. 6 is a sectional view showing the action of the belt pressing roller. 2...Document transport device, 3...Document glass, 4...
...Conveyor belt, 14...Drive roller, 15...Followed roller, 18...Bearing member, 19...Belt presser roller, 21...Scale plate, 22...Scale plate stepped portion, 23...Document passage gap .

Claims (1)

[Claims] 1. Can be rotated in forward and backward directions on the original glass, and during normal rotation, the original is pulled from the paper feed section onto the original glass, and when reversed, the rear edge of the original is brought into contact with the scale plate stepped section provided at the end of the original glass on the paper feed side. In a document conveying device equipped with a conveyor belt, of the belt press rollers on the paper feed side and the paper discharge side that press down the lower running surface of the conveyor belt, the belt press roller on the paper feed side is placed directly above the stepped portion of the scale plate. 1. A document conveying device, characterized in that it is mounted on a bearing so that it can move in conjunction with the forward and reverse running of the conveyor belt between a point and a point ahead of it in a document feeding direction.