JPH09281609A - Original cover for copying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the operation of an operator whether original size is large or small by making a front original cover part elongate/contract with reference to a rear original cover part. SOLUTION: This original cover is provided with the front original cover part 1, the rear original cover part 2, and a coupling member 3 connecting the original cover parts 1 and 2. The leading end of the member 3 is slidably fit in a groove hole 4 formed at both side parts of the original cover part 1 through a pin 5, and the trailing end thereof is pivotally supported at both side parts of the original cover part 2 through a pin 6. The groove hole 4 is inclined obliquely upward from the front to the rear, and the stopper 7 of the member 3 is protrusively provided at the upper edge of the trailing end of the groove hole 4. The leading end of the original cover part 1 is turned upward centering the pin 6 and stopped when the original cover part 1 reaches the obliquely upper part of the original cover part 2. By pressing the original cover part 1 backward, the pin 5 slides in the groove hole 4 backward, and the original cover part 1 becomes horizontal to be in a contracted state where a part of the original cover part 1 is superposed on the upper part of the original cover part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document pressure plate for a copying machine.

[0002]

2. Description of the Related Art Conventionally, as a document pressure plate of this type of copying machine,
The one in which the front pressure plate part 1 and the rear pressure plate part 2 are connected,
It is publicly known as disclosed in Japanese Patent Laid-Open No. 6-148761, and the usage state of such a thing is shown in FIGS. 9 and 10. The one shown in FIG. 9 is A3 size, and the one shown in FIG. A
Copiers C and C'having document pressure plates P and P'for documents of two or more sizes are shown, respectively.

[0003]

In the case of a copying machine C having a document pressure plate P corresponding to an A3 size document, as shown in FIG. 9, the worker W has no particular inconvenience and the document pressure plate P However, in the case of a copying machine C'having a document pressure plate P'corresponding to a document of A2 size or larger, its opening is .theta.1 as shown in FIG. With such a large size, the hand of the worker W cannot reach the front pressure plate portion 1 of the document pressure plate P ′, making the operation difficult, and the opening degree θ.
If it is as small as 2, the head of the worker W is located near the front pressure plate portion 1 and there is a problem that it interferes with the operation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-described problem of the original pressure plate of the copying machine, and even in the case of a large-sized original, the operator's hand can press the front pressure plate portion of the original pressure plate. It is difficult to operate because it is not reached, or even if the size of the original is small, the operator's head is located near the front pressure plate part, which disturbs the operation. There is to provide a manuscript platen for copiers without.

[0005]

In order to achieve the above-mentioned object, the present invention is a manuscript for a copying machine in which a front pressure plate portion, a rear pressure plate portion, and these pressure plate portions are connected by a connecting portion. In the pressure plate, the invention according to claim 1 is characterized in that the connection part is provided with a connection member for connecting the front pressure plate part to the rear pressure plate part so as to extend and contract.

According to a second aspect of the present invention, the connecting portion between the front pressure plate portion and the rear pressure plate portion is urged to be closed when the front pressure plate portion is extended with respect to the rear pressure plate portion and opened when the front pressure plate portion is contracted. It is characterized by having a member.

According to the third aspect of the present invention, a pressure sheet is stretched between the front pressure plate portion and the rear pressure plate portion on the side facing the original, and the pressure sheet is stretched and contracted when the front pressure plate portion is extended. In any of the above, the front pressure plate portion and the rear pressure plate portion are supported so as not to cause slack.

[0008]

Embodiments of the present invention will be described with reference to the drawings. In each embodiment, the same parts are designated by the same reference numerals, and the description thereof will be omitted. The different parts will be mainly described.

The first embodiment shown in FIGS. 1 to 4 is provided with a front pressure plate portion 1, a rear pressure plate portion 2, and a connecting member 3 for connecting the front pressure plate portion 1 and the rear pressure plate portion 2. The front end of the connecting member 3 is slidably fitted into the slots 4 provided on both sides of the front pressure plate portion 1 by means of pins 5, and the rear end is pivotally supported by the pins 6 at both sides of the rear pressure plate portion 2. The slot 4 extends linearly in the lower portion from the front to the rear, and the rear end is inclined rearward and obliquely upward, and the stopper 7 of the connecting member 3 is provided at the upper edge of the rear end of the slot 4. Has been done.

In this first embodiment, a support hole 9 at the rear end of the rear pressure plate portion 2 is pivotably supported by a support shaft 10 of the copying machine 17 shown in FIG. The front pressure plate portion 1 is extended and is in a closed state. When attempting to press the original with this, the operator 8 turns the front end of the front pressure plate portion 1 upward about the pin 6 as shown in FIG. Stop when it reaches diagonally above. When the front pressure plate portion 1 is pushed rearward here, the pin 5 slides backward in the slot 4 and the front pressure plate portion 1 becomes horizontal.
As shown in FIG. 5, a part thereof is in a contracted state in which it is stacked above the rear pressure plate portion 2.

As shown in FIG. 5, the operator 8 rotates the entire pressure plate about the support shaft 10 to bring it to the open position so that the front end of the front pressure plate portion 1 has a desired angle .theta.3, and then the copying machine. The document is placed on 17 and is operated in the reverse order to bring the front pressure plate portion 1 to the extended closed position to press the document. In this way, even in the case of a large-sized original, even if the operator 8's hand does not reach the front pressure plate portion 1 of the original pressure plate, the operation becomes difficult, or even in the case of a small-sized original. Since the operator's head is located near the front pressure plate portion 1, there is no possibility of disturbing the operation.

The second embodiment shown in FIG. 6 has the same structure as the second embodiment except that the torsion spring 11 is mounted on the support shaft 10 of the rear pressure plate portion 2 except for the first embodiment. Such a second embodiment is opened and closed in the same procedure as the first embodiment. In the closed position, the center of gravity is located at the position G1 which is at a distance X1 from the support shaft 10, and at the position where the front pressure plate portion 1 contracts and both pressure plate portions 1 and 2 are stacked, the support shaft 10 extends from the support shaft 10 to X2. Move to position G2 at a distance of.

In this case, the counterclockwise rotation moment WX due to gravity W about the support shaft 10 at the positions G1 and G2.
If the moment M of the torsion spring 11 is set so that the relation between WX1 and WX2 and the moment M in the clockwise direction generated by the torsion spring 11 is WX1>M> WX2, the front pressure plate portion 1 contracts as shown by the chain line. When the pressure plate is moved to the position, the pressure plate is automatically moved to the open position, which facilitates the movement of the pressure plate to the open / close position as compared with the first embodiment, and the front pressure plate part 1 is held at that position in the closed position. To be done.

In the third embodiment shown in FIGS. 7 and 8, a pressure sheet 12 is stretched between the front pressure plate portion 1 and the rear pressure plate portion 2 on the side facing the original, and the pressure sheet 12 is attached to the front pressure plate 12. It differs from the first and second embodiments in that it is supported by the front pressure plate portion 1 and the rear pressure plate portion 2 so as not to cause slack either when the portion 1 is extended or when it is contracted, and the others are the same. Has become. For this reason, in this embodiment, the first and second support members 13 and 14 are provided laterally on the rear and front portions of the rear pressure plate portion 2, and both support members are provided.
Both ends of the pressure sheet 12 are stretched between 13 and 14, and the middle of the pressure sheet 12 is wound around the first and second guide rollers 15 and 16 which are laterally provided in the front and rear portions of the front pressure plate portion 1.

In the third embodiment as described above, the fixing operation is performed in the same manner as in the first embodiment, but in FIG. 7, the pressure sheet 12 is not shown in the closed state where the front pressure plate portion 1 is extended. When the document is pressed and the front pressure plate portion 1 in such a state is contracted as shown in FIG. 8, the second guide roller 16 pulls the pressure sheet 12 rearward to absorb the slack.

In such a thing, 18 is a pressure sheet
12 shows a cushioning material provided on the back surface, which may be omitted if desired, and although not shown, a spring may be provided between the first and second guide rollers 15 and 16 to prevent the occurrence of slack. Alternatively, the space between the first guide roller 15 and the second support member 14 may be formed by an appropriate material instead of the pressure sheet 12. By providing the pressure sheet 12 in this manner, it is possible to suitably press the document, and it is possible to keep the pressure sheet 12 always in a tensioned state, and to improve operability and appearance. It can maintain and prolong life.

[0017]

As described above, the present invention is a document pressure plate of a copying machine in which a front pressure plate portion, a rear pressure plate portion, and these pressure plate portions are connected by a connecting portion. According to the invention described in the above, since the connecting member is provided with the connecting member for connecting the front pressure plate portion to the rear pressure plate portion so that the front pressure plate portion can expand and contract, even if the document is large in size, The front pressure plate of the pressure plate may not reach the front pressure plate, making it difficult to operate.Also, even in the case of a small-sized document, the operator's head is located near the front pressure plate, which disturbs the operation. There is no such thing as doing.

According to a second aspect of the invention, the connecting portion between the front pressure plate portion and the rear pressure plate portion is urged to close the front pressure plate portion when the front pressure plate portion is extended with respect to the rear pressure plate portion and to open the front pressure plate portion when the front pressure plate portion is contracted. Since a member is provided, when the front pressure plate part is moved to the contracted position, the document pressure plate is automatically moved to the open position, which facilitates the movement of the document pressure plate to the open / close position, and in the extended state. In, there is an effect that the front pressure plate portion is held at that position.

According to a third aspect of the present invention, a pressure sheet is stretched between the front pressure plate portion and the rear pressure plate portion on the side facing the original, and the pressure sheet is stretched and contracted when the front pressure plate portion is extended. In any of the above, since it is supported by the front pressure plate portion and the rear pressure plate portion so as not to cause slack, it is possible to suitably press the original document by the pressure sheet, and always tension the pressure sheet. It has an effect that it can be maintained in a state, the operability and the appearance are kept good, and the life is extended.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a front view showing a state in the middle of a contracting operation of the front pressure plate portion of the above.

FIG. 3 is a front view showing the contracted state of the front pressure plate portion of the above.

FIG. 4 is an enlarged perspective view of part 4 of FIG.

FIG. 5 is a front view showing a usage state of the above.

FIG. 6 is a vertical sectional front view of a second embodiment of the present invention.

FIG. 7 is a vertical sectional front view of a third embodiment of the present invention.

FIG. 8 is a vertical cross-sectional front view of the above-described front pressure plate portion in a contracted state.

FIG. 9 is a diagram illustrating the use of another conventional document pressure plate of the same type as the present invention.

FIG. 10 is a diagram illustrating the use of still another conventional document pressure plate of the same type as the present invention.

[Explanation of symbols]

 1 Front pressure plate part 2 Rear pressure plate part 3 Connecting member 4 Groove hole 5 pin 6 pin 7 Stopper 8 Worker 9 Support hole 10 Support shaft 11 Torsion spring 12 Pressing sheet 13 First support member 14 Second support member 15 First guide Roller 16 Second guide roller 17 Copier

Claims (3)

[Claims] 1. In a document pressure plate of a copying machine in which a front pressure plate portion, a rear pressure plate portion, and these pressure plate portions are connected by a connecting portion, the front pressure plate portion can be expanded and contracted with respect to the rear pressure plate portion in the connecting portion. An original pressure plate for a copying machine, which is provided with a connecting member for connecting to. 2. The connecting portion between the front pressure plate portion and the rear pressure plate portion is provided with a biasing member that is closed when the front pressure plate portion is extended with respect to the rear pressure plate portion and is opened when the front pressure plate portion is contracted. The document pressure plate of the copying machine according to claim 1. 3. A pressure sheet is stretched between the front pressure plate portion and the rear pressure plate portion on the side facing the original, and the pressure sheet causes slack when the front pressure plate portion is extended or contracted. The original pressure plate of the copying machine according to claim 1 or 2, wherein the original pressure plate is supported by the front pressure plate portion and the rear pressure plate portion so as not to occur.