JPS6243632A - Image forming device with original feeding means - Google Patents

Abstract

PURPOSE:To change image areas automatically and to eliminate the position shift of an image by providing an original reference abutting member on an original platen and an original conveying means, and switching original references. CONSTITUTION:When a lens 3 is at a position (a), the image in an image area A is copied to an area C. An original 17 is placed along an end surface of the abutting member 2 on a platen 1 and when the original feeding means is put in operation, the original passes on the platen at the distance of an offset lfrom a reference 6, so when the lens 3 is moved to a position (b), an image area B which is displaced by the quantity l is copied. Thus, the shift between the original and copy image is eliminated and the original is fed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Scope of Application for Industry 1] The present invention is applied to an image forming apparatus such as an Ichif Photocopier Tr7, a laser beam printer, etc., which has a single-stage document transport table for conveying a document onto a document table. It is related to the device.

The following is an explanation using a copying machine as an example.

[1r, 1 which the prior art and the invention II try to solve
[Illumination point] Conventional single-sided reference multiple IJ: In the machine, the platen 9
．． As shown in FIG. 2, an abutment member 8 is provided at the 1=, and the original is aligned by aligning it against the abutment member 8. However, in this copying machine, there is a 1. If it breaks, it is difficult to completely align the abutment member 8 with the edge of the document, and if the document touches the abutment member 8 while the document is being conveyed, there will be problems such as the document being torn or skewed. There was a risk that this would occur. Therefore, conventionally, the document is sometimes conveyed at a point where the document is faded from the abutting member 8 by about 2 times, and in this case, the image on the copy paper 1 is also shifted by about 2 times by 1 step when the document feeder is used. There was a problem that the files were copied.

[Invention’s II]

Unissued II solves the above problem and 1b; [Document transport r stage is 4
Even when using a single-stage document conveyor, the image area is automatically adjusted so that the image position does not shift in an image forming apparatus with a 1. /JReturning is [1 target].

[Means for solving problems]

The present invention, which achieves the above object 1-1, includes a document table, a r The apparatus is characterized in that it has a document transport stage for transporting the document, a document reference when the document feeder F is used, and a document reference when it is not used, and the document reference can be switched. be.

[°x example]

1, 3(a), 3(b), 4, and 5 show an embodiment of the present invention. Figure 1 is a side view of the embodiment, Figure 3 is a side view of the embodiment.
FIG. 3(a) is a side view of a copying machine equipped with a document conveyance means to which an embodiment of the present invention is applied, FIG. 3(b) is a cross-sectional view of the - part, and FIG. FIG. 5 is a side view of the lens drive mechanism. In FIG. 0, reference numeral 1 indicates a platen glass serving 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 crow 1-):, and serves as a reference when placing the document on the platen 1L. Reference numeral 3 denotes a lens which forms an irradiated original image of the original placed on the platen 11 onto the photoreceptor 4L. Note that the image formed on the photoreceptor 4L is copied onto copy paper by a known process means. Further, 10 is a paper feed tray on which a document to be fed is placed. The document is conveyed from the paper feed tray 10k onto the platen l by the feed roller 11a*conveyance bell) 11, and after the surface of the document is irradiated, the document is discharged to the paper discharge tray 14 by the bell) 11. Note that 12aab is a roller, of which 12b is a belt drive roller. Moreover, 13a*b is a belt presser roller.

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

Reference numeral 24 denotes a lens holding member which holds the lens 3, positions it around the shaft 21, and is rotatable between the reference members 20. This holding member 24 is pulled by the lever 23 and is normally located at the position a shown by the solid line. When using the document conveyance means, the holding member 24 is pulled by the plunger 22 that is driven in response to the signal and is placed at the position shown by the dotted line. Move to. Therefore, the lens 3 moves between the position indicated by the solid line a and the position indicated by the dotted line.

Next, the operation of this embodiment will be described.

Normally, the lens 3 is located at position t 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 only needs to place the original on the platen 1 along the end surface of the abutment member 2 (normal original reference 6), and when using the original feed f single stage T, check the amount of offset as described above. (this is the document for document feed stage T) S 7) The document passes over the platen L, but
As described above, the lens 3 is moved to the position indicated by the broken line by the plunger 22, which is turned on in response to the drive signal of the document feed f stage T, and shifts the copy image area on the platen l by the amount of text to the area B ( Copying the image area for the document feeder) IS can eliminate the misalignment between the original and copy images even when the document feeder is used. Here, C in Figure 1
is the copy image area (transfer paper passing area). In Fig. 4, 2a indicates the original size, and 17 indicates the original 8! The document being conveyed by the conveyance means, 18 is the document by the normal mote, and 19 is the conveyance direction.

In this example, manuscript 2! Although we used moving the lens to move the horizontal axis, other means include moving the paper feeder so that the copy paper is fed by shifting the copy paper by the width when using the document feeder, or shifting the fed copy paper. In another embodiment, when the document feeder is used, the entire platen and document feeder may be moved by l relative to the subject body.

As another example, if the copying machine is divided into a reader part and a printer part and can convert an image into an electrical signal, the reference position may be shifted by a bar that processes the image signal. Also good.

〔Effect of the invention〕

As explained above, in an image forming apparatus based on one side,
The two types of original standards, the original standard when using the original feeding means and the original standard when in normal mode, are submerged by °19, so that the original can be stably fed and the images on the copy paper always match.・IS can be created.

[Brief explanation of the drawing]

Fig. 1 is an optical development view showing an example of an unreleased IJ1, Fig. 2 is a 14-plane view of a conventional example, Fig. 3(a) is a side view showing the platen, and Fig. 3(b) is a side view of the conventional example. 4 is a perspective view showing the positional relationship between the platen and the abutment member and the document reference, and FIG. 5 is a side view showing the lens moving means. In the figures, 1 is a platen crow, 2. 8 is an abutting member, and 3 is a lens.

Claims (1)

[Claims] (1) A document table; a document reference abutting member for aligning the document at a predetermined position on the document table; a document conveyance means for conveying the document along the abutment member; and the document conveyance means. An image forming apparatus having a document feeding means, which has a document reference when the document is used and a document reference when the document is not used, and the document reference is switchable.