JPH0723951B2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application range] The present invention relates to an image forming apparatus such as an electrophotographic copying machine and a laser beam printer, which has a document conveying means for conveying a document onto a document table. .

Hereinafter, a copying machine will be described as an example.

[Problems to be Solved by Prior Art and Invention]

In a conventional one-sided reference copying machine, an abutting member 8 is provided on a platen 9 as shown in FIG. However, in the case where this copying machine is provided with the document feeding means for feeding the document along the abutting member, it is difficult to make the abutting member 8 and the end of the document completely coincide with each other, and the abutting member during the document feeding. When the document 8 touches the document 8, there is a risk that the document may be shaken or skewed. Therefore, conventionally, the document may be conveyed at a position away from the abutting member 8 by about l = 2 mm. In this case, the image on the copy paper is also shifted by about 2 mm when the document feeding device is used. was there.

[Object of the Invention]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to automatically switch an image area so as not to shift the position of an image in an image forming apparatus having a document conveying means even when the document conveying means is used. And

[Means for solving problems]

The present invention that achieves the above object is provided with a document table, a document conveying means for conveying a document on the document table, and a document conveying direction which is a reference for positioning the document when the document is placed on the document table. A first mode in which a document abutting member is provided, and a document is placed on the document table to form a document image on a recording material without using the document conveying means; In the image forming apparatus capable of forming an image on a recording material by selecting the second mode in which the original is automatically placed on the recording material by placing the original on the recording material, the reference for placing the original is set in the second mode. At a position separated from the original document abutting member by a predetermined distance in the direction perpendicular to the original document conveyance direction, and the image forming apparatus on the recording material in the direction perpendicular to the original document conveyance direction in the first mode and the second mode is the same. The original image with respect to the recording material It is characterized in that it has a moving means capable of moving the predetermined distance in a direction perpendicular to.

〔Example〕

FIGS. 1, 3 (a), 3 (b), 4 and 5 show an embodiment of the present invention. FIG. 1 is a side view of the embodiment, and FIG.
FIG. 3A is a side view of a copying machine provided with a document conveying means to which an embodiment of the present invention is applied, FIG. 3B is a partial sectional view thereof, and FIG. 4 is a partial perspective view thereof. FIG. 5 is a side view of the lens drive mechanism. In the figure, reference numeral 1 denotes a platen glass as a document table on which a document to be read is placed. Reference numeral 2 denotes a document abutting member, which is provided on the platen glass 1 and serves as a reference when a document is placed on the platen 1. 3 is a lens
The irradiation document image of the document placed on the platen 1 is formed on the photoconductor 4. The image formed on the photoconductor 4 is copied onto copy paper by a known process means. Further, reference numeral 10 is a paper feed tray on which a document to be fed is placed. The original document is conveyed from the paper feed tray 10 onto the platen 1 by the feed roller 11a and the conveyor belt 11 to illuminate the original surface, and then is ejected to the paper ejection tray 14 by the belt 11. Incidentally, 12a and 12b are rollers, and 12b of them are belt driving rollers. Further, 13a and 13b are belt pressing rollers.

Further, FIG. 5 is a drive mechanism diagram of the lens 3.

A lens holding member 24 holds the lens 3 and is rotatable between the positioning reference members 20 about the shaft 21. The holding member 24 is pulled by the spring 23 and is normally at the position a indicated by the solid line. When the document conveying means is used, the holding member 24 is pulled by the plunger 22 driven by the signal thereof and is moved to the position indicated by the dotted line b. Moving. Therefore, the lens 3 can move between the position of the solid line a and the position of the dotted line b.

Next, the operation of this embodiment will be described.

Normally, the lens 3 is at the position of the solid line a on the right side, and the image area to be copied at this time is A (normal image area).
Therefore, the operator may place the document on the platen 1 along the end face of the abutting member 2 (normal document reference 6). When the document feeding means T is used, as described above, the document passes the platen 1 away from the abutting reference 6 by the offset amount 1 (this is the document reference 7 for the document feeding means T). 3 moves to the position of the broken line b by the plunge shear 22 which is turned on in response to the drive signal of the document feeding means T, and shifts the copy image area on the platen 1 by l.
By copying the area (image area for original feeding means), it is possible to eliminate the deviation between the image of the original and the copy even when the original feeding means is used. Here, C in FIG. 1 is a copy image area (transfer paper passing area). In FIG. 4, 2a is a document size display, 17 is a document being conveyed by the document conveying means, 18 is a document in the normal mode, and 19 is a conveying direction.

In this embodiment, the movement of the lens is used as a means for moving the original image, but as another means, the copy paper, which is a recording material, is fed by shifting by 1 when the original feeding device is used. There may be provided means for moving the apparatus or shifting the fed copy paper before transferring. As another embodiment, when the document feeder is used, the platen and the document feeder as a whole may be moved by 1 relative to the subject body. As another embodiment, when the copying apparatus is divided into a reader section and a printer section so that an image can be converted into an electric signal, the reference position may be shifted by processing the image signal. .

〔The invention's effect〕

As described above, in the one-sided reference image forming apparatus,
By providing two types of document standards, that is, the document standard when the document feeding means is used and the document standard in the normal mode, the document can be stably fed and at the same time, the images on the copy sheets can be matched.

[Brief description of drawings]

FIG. 1 is an optical development view showing an embodiment of the present invention, FIG. 2 is a top view of a conventional example, FIG. 3 (a) is a side view showing a platen, and FIG. 3 (b) is a partial sectional view. FIGS. 4 and 5 are perspective views showing the positional relationship between the platen and the abutting member and the document reference,
The figure is a side view showing the lens moving means. In the figure, 1 is a platen glass, 2 and 8 are abutting members, and 3 is a lens.

Claims (1)

[Claims] 1. A document table, document conveying means for conveying the document on the document table, and a document provided parallel to a document conveying direction which serves as a positioning reference for the document when the document is placed on the document table. A first mode in which a document is placed on the document table without using the document conveying means to form a document image on a recording material, and a document is automatically placed on the document table by the document conveying means. An image forming apparatus capable of forming an image on a recording material by selecting a second mode in which the original image is formed on the recording material by placing the original image on the recording material. The original is placed at a position separated from the abutting member by a predetermined distance in the direction perpendicular to the original conveying direction, and the original is formed so that the image forming position on the recording material in the direction perpendicular to the original conveying direction in the first mode and the second mode coincides. Place the image on the recording material in the direction perpendicular to the document transport direction. An image forming apparatus having a moving unit that can move a predetermined distance.