JP2002131852A - Document pressing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve improvement in accuracy of adjusting of a document pressing plate and also facilitate the adjusting operation. SOLUTION: The document pressing plate equipped with an automatic document feeding apparatus(ADF) comprising a reading base for placing a document and a hinge part fitting the document pressing plate to the reading base, and is adjusted with respect to the reading base with using one side of the hinge part as a fixing side and the other side as an adjusting side. In this case, there provided a fixing pin 13 fixing a hinge 12 at the adjusting side to the reading base 4 and an adjusting screw 14 screwed into the hinge 12 and making an end face 14a of the hinge abut on a head 13a of the fixing pin 13, and the hinge 12 is slidably displaced to a desired position by fastening or loosening of the adjusting screw 14, and the position of the hinge 12 with the reading base 4 is continuously adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for finely adjusting a document pressing plate for covering a surface of a flood bed in an automatic document feeder provided with a flood bed scanner with respect to the apparatus main body.

[0002]

2. Description of the Related Art Conventionally, in an image reading apparatus provided with a flood bed scanner such as a copying machine, an original or a book is placed on a flatbed glass, and after an original pressing plate is closed and pressed from above, reading is performed. Had been done. An automatic document feeder (hereinafter, referred to as an original feeder)
An "ADF") is attached thereto, and is also used as a sheet feed type scanner for reading an image while feeding originals one by one to the ADF. In this case, an original pressing plate 10 and a reading device shown in FIG. Is important, and when the document pressing plate 10 is closed, it must be accurately attached to the reading table 4. That is, it is necessary to match the original conveying line on the original pressing plate 10 with the original reading line on the reading table 4 so as not to shift. If the positional relationship described above is displaced, the document enters obliquely with respect to the reading position, the image to be read is tilted to the left and right, the image copied on the recording paper is also tilted, or when the document passes through the reading position. The image to be read fluctuates due to fluttering, and the image quality to be copied on the recording paper is also affected. Therefore, usually, one of the hinges 11 and 12 for attaching the document pressing plate 10 to the reading table 4 is fixed, and the other 12 is adjustable so that the hinge 11 rotates about the reading table 4 with the one hinge 11 as a fulcrum. By adjusting the other hinge 12, the original pressing plate 1
0 and the reading table 4 were aligned.

Specifically, as shown in FIGS. 4 and 5,
In the hinge 12 on the adjustment side, the hinge plate 17 is addressed in front of the fixing pin 13 protruding from the upper surface of the reading table 4, and the fixing pin 13 and the hinge plate 19 are connected to the hinge 1.
After fitting into the long hole 12b opened in the second seat portion 12B and sliding the hinge 12 backward to fix the position,
The front end of the seat 12 </ b> B was fastened with a mounting screw 18 and fixed to the reading table 4.

[0004] The hinge plate 17 has three groove portions 17a, 17a.
17a, these grooves 17a, 17a,
17a have different radial depths. Therefore, by switching one of the grooves 17a engaging with the body 13b of the fixing pin 13 to the other groove 17a, the hinge 12 slides back and forth. Dynamically displaces the original pressing plate 10
The position of was adjusted.

[0005]

However, as described above, the grooves 17a, 17a, 17
a, the document pressing plate 1 and the hinge 12 are switched.
0 has to be released once, resulting in a gap in the hand, and the fine adjustment of the document holding cover 12 requires the fixing pin 13 and the groove 1.
Due to the engagement with one of 7a, 17a and 17a, only three stages can be performed, and fine adjustment can be performed only within that range.

[0006]

The present invention uses the following means to solve the above problems. That is,
A mounting table for mounting an original, as described in claim 1,
A document pressing plate provided with an automatic document feeder, and a plurality of hinges for attaching the document pressing plate to the mounting table, one of the hinges serving as a fixed side, the other as an adjustment side, and On the other hand, in a document pressing plate that can be rotated and adjusted with the fixed side hinge portion as a fulcrum, a fixing means for fixing the adjustment side hinge portion to the mounting table, and screwed to the adjustment side hinge portion. And a screw for contacting the tip with the fixing means.

Further, as described in claim 2, the screw is screwed in from the outer side surface of the hinge portion on the adjustment side, and the document pressing plate is aligned with the mounting table from outside the apparatus.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to an original pressing plate 10 mounted on a multi-function facsimile machine. FIG. 1 is a perspective view of a copy / facsimile multifunction peripheral provided with an ADF, FIG. 2 is a side view (partial side sectional view) of a hinge according to the present invention, and FIG. 3 is an explanatory view of fine adjustment of a document pressing plate with respect to a reading case. And
4A is a side sectional view of a conventional hinge, and FIG. 5 is a plan sectional view of the same, before fine adjustment and FIG. 4B after fine adjustment.

In the following description, the front, rear, left, and right directions of each structure will be described with the direction of the arrow (the operation panel 3 side in the case of a copy / facsimile multifunction machine) shown in FIG. The front, rear, left and right directions in other drawings are also based on FIG.

As shown in FIG. 1, the copy / facsimile multifunction machine includes a reading unit 1 disposed above a recording unit 2, and transmits an image of a document or the like read by the reading unit 1 to the recording unit 2.
To copy on recording paper.

The reading section 1 is used as a flat bed type scanner that scans a stationary document or the like by scanning a reading device 6 provided in a reading table 4 and fixes the reading device 6 in position. Is fed to the ADF 8 attached to the right end of the document pressing plate 10 and is read as it is used as a sheet feed type scanner.

In the former case, an original or the like is placed on a flatbed glass 5 formed on the upper surface of the reading placing table 4,
The document pressing plate 10 is closed and pressed from above, and a start button provided on the operation panel 3 is pressed here. As a result, the reading device 6 moves from the right end position to the left end position of the flatbed glass 5 to perform scanning, and an image of the original or the like is read.

In the latter case, the original pressing plate 10
When the document is set in the paper feed port 8a of the ADF 8 and the start button is pressed here, the documents are taken into the ADF 8 one by one. At this time, the reading device 6
Is moved to a position below the platen glass 9 and is fixed in position. The document is read by the reading device 6 when passing through the opening 8 b below the ADF 8 facing the platen glass 9.

Next, adjustment of the document pressing plate 10 with respect to the reading table 4 will be described. As shown in FIGS. 1 and 2, an original pressing plate 10 is provided with hinges 1 arranged at the rear end thereof.
1 and 12 are pivotally supported by fixing pins 13 and 13 at the rear end of the upper surface of the reading table 4, so that the reading case 10 can be turned up and down around the fixing pins 13 and 13 as a fulcrum. It is configured to be movable.

By the way, as shown in FIG. 3A, when the original pressing plate 10 is closed, the position of the original pressing plate 10 may be shifted with respect to the reading table 4. ADF
When the lower opening 8b and the platen glass 9 at the opposite position are displaced in the horizontal direction, the opening 8b
Will enter the platen glass 9 obliquely, so that the read image will be inclined left and right, and the image copied on the recording paper will also be inclined. Also, an ADF 8 having a platen glass 9 and an opening 8b is provided.
If the lower surface is displaced in the vertical direction and the clearance is not constant, the scanned image fluctuates when the document passes through the platen glass 9 and is read, and as a result, It also affects the image quality copied on the recording paper.

Therefore, as shown in FIG. 3 (b), one of the hinges 11 and 12 for attaching the document pressing plate 10 to the reading table 4 is fixed, and the other 12 is adjustable so that the reading table 4 is attached to the reading table 4. On the other hand, the other hinge 12 is adjusted by turning the one hinge 11 as a fulcrum, so that the platen glass 9 and the opening 8b on the lower surface of the ADF 8 are aligned with each other. Top and A
The lower surface of the DF8 was parallel.

As shown in FIGS. 4 and 5, a hinge plate 17 is addressed to the hinge 12 on the adjustment side in front of a fixing pin 13 protruding from the upper surface of the reading table 4. Plate 19 and seat 1 of hinge 12
It fits into the long hole 12b opened to 2B. After the hinge 12 is slid rearward to fix the position, the seat 12
The front end of B is fastened with a mounting screw 18 and fixed to the reading table 4. Reference numeral 19 denotes a nut, and the screw hole of the mounting screw 18 provided on the seat portion 12B of the hinge 12 is a long hole 12c.
It is formed with.

The hinge plate 17 has three groove portions 17a, 17a.
17a, these grooves 17a, 17a,
17a have different radial depths. Therefore, by switching one of the grooves 17a engaging with the body 13b of the fixing pin 13 to the other groove 17a, the hinge 12 slides back and forth. Dynamically displaces the original pressing plate 10
Is adjusted.

However, in order to switch the grooves 17a, 17a, 17a of the hinge plate 17 as described above, the document pressing plate 10 must be opened once together with the hinge 12, which requires a hand gap and the document pressing cover 1
The fine adjustment of 2 is performed by fixing pin 13 and grooves 17a, 17a, 1
Due to the engagement with one of the members 7a, only three steps can be performed, and fine adjustment can be performed only within that range.

Therefore, in the present invention, the structure of the hinge 12 is improved as follows. As shown in FIG.
The seat 12B has an elongated hole 12a extending in the front-rear direction, and a fixing pin 13 protruding from the upper surface of the reading table 4 is fitted into the elongated hole 12a. The width of the elongated hole 12a is formed in accordance with the outer diameter of the body 13b of the fixing pin 13.

An adjustment screw 14 is screwed forward from the rear surface of the seat 12 of the hinge 12, and the front end surface 14 a of the adjustment screw 14 is brought into contact with the head 13 a of the fixing pin 13. The adjusting screw 13 is fixed by nuts 15 and 16 on both inner and outer surfaces of the hinge 12.

In such a configuration, when the adjusting screw 14 is screwed in, the adjusting screw 14 is blocked by the fixing pin 13 and does not move forward.
The hinge 12 is slidably displaced rearward by being guided by the thread. Thus, as shown in FIG.
When the position of the document mounting table 4 can be adjusted, the nut 16 is tightened, the hinge 12 is clamped between the nuts 15 and 16 to fix the position, and the document pressing plate 10 is corrected to an appropriate position. As a result, the other hinge 12 side of the document pressing plate 10 is rotated in the horizontal direction with the one hinge 11 as a fulcrum, and the document conveying line on the document pressing plate 10 side and the document reading line on the reading table 4 side are moved. It can be adjusted to match.

In this configuration, there is no need to remove the original pressing plate 10, and only by adjusting the adjusting screw 14 from the rear side of the copy / facsimile machine, the original pressing plate 10 is removed.
Can be easily adjusted. Further, the adjusting screw 14
And the hinge 12 can be slid and displaced to a desired position, so that the adjustment of the document pressing plate 10 can be performed in a stepless manner, and the adjustment accuracy can be improved.

Further, since the fixing pin 13 on the apparatus main body side and the adjusting screw 14 screwed to the hinge 12 to which the document pressing plate 10 is attached are in contact, the hinge 12 and the fixing pin 13
The ground of the ADF 8 provided on the document pressing plate 10 can be taken between the two.

[0025]

As described above, the present invention has the following advantages. That is, claim 1
And a document pressing plate provided with an automatic document feeder, and a plurality of hinge portions for attaching the document pressing plate to the mounting table. One is a fixed side, and the other is an adjustment side, and the hinge side of the adjustment side is fixed to the mounting table in a document pressing plate that is rotatable and adjustable with the hinge section of the fixed side relative to the mounting table as a fulcrum. By providing a fixing means and a screw which is screwed into the hinge part on the adjustment side and whose tip abuts on the fixing means, the screw is tightened and loosened to move the hinge part on the adjustment side to a desired position. As a result, the position of the document pressing plate can be adjusted steplessly, and the adjustment accuracy can be improved.

Further, by screwing the screw from the outer side surface of the hinge portion on the adjusting side, the screw can be adjusted from the outside of the apparatus without having to open and remove the document pressing plate. The document pressing plate can be easily adjusted, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a copy / facsimile multifunction peripheral having an ADF.

FIG. 2 is a side view (partial side sectional view) of the hinge according to the present invention.

FIG. 3 is an explanatory diagram of fine adjustment of a document pressing plate with respect to a reading case.

FIG. 4 is a side sectional view of a conventional hinge.

FIG. 5 is a plan sectional view of the same.

[Explanation of symbols]

 Reference Signs List 4 reading mounting table 6 reading device 8 ADF 8b opening 9 platen glass 10 document pressing plate 12 hinge 12a long hole 13 fixing pin 13a head 14 adjusting screw 14a front end face

Claims (2)

[Claims] 1. A mounting table for mounting a document, a document pressing plate provided with an automatic document feeder, and a plurality of hinge parts for attaching the document pressing plate to the mounting table. One side of the document is a fixed side, the other side is an adjustment side, and the hinge on the adjustment side is fixed to the mounting table in a document pressing plate that is rotatable with the hinge on the fixed side with respect to the mounting table as a fulcrum. An original pressing plate, comprising: a fixing means for screwing the hinge portion on the adjustment side; and a screw for abutting an end of the fixing means with the fixing means. 2. The document pressing plate according to claim 1, wherein the screw is screwed from an outer surface of the hinge portion on the adjustment side.