JP2935513B2 - Image forming device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus in which sheet conveyance is based on a center and a reading system is based on a right front.

[Conventional technology]

Based on a signal from the sheet presence detection unit, the image forming apparatus is configured such that the driving unit moves the manual feed guide toward the width until the sheet end detection unit detects the end of the sheet.
For example, it is described in JP-A-64-2957.

[Problems to be solved by the invention]

In the above prior art, the size of the paper is detected by a contact between a slider of the paper guide and a size detection plate.
In such detection, if a margin is provided in consideration of the operability when using the guide, there is a problem that it is difficult to determine which size to select when the approximate size is within the margin. Was.

An object of the present invention is to select an approximate size that cannot be detected by the guide of the manual feed table by a selection unit, so that the paper size is determined by the guide width when the paper conveyance is the center reference and the original reading system is the right front reference. It is an object of the present invention to provide an image forming apparatus capable of preventing an image position to be transferred onto a sheet from being shifted due to a shift of both references due to a failure in detection, and capable of accurately copying an image position.

[Means for solving the problem]

In an image forming apparatus having a manual feed table and performing manual feed from the manual feed table to perform manual copy, the image forming apparatus moves to match the position of the paper size to be used at the time of manual copy, and moves the end of the paper. A paper size is detected by a guide provided movably in a direction orthogonal to a paper feeding direction on the manual feed table so as to abut against an edge and guide manual paper feeding, and a guide width based on a position of the guide. Paper size detection means, a liquid crystal display of an operation unit for displaying the paper size detected by the paper size detection means, and a paper size different from the paper size displayed on the liquid crystal display of the operation unit; Select an approximate size that can not be detected separately from the paper size due to the margin for setting It is achieved by means a-option means.

[Action]

The image forming apparatus operates to move the guide to the position of the paper size desired to be used, and when another approximate size is displayed on the liquid crystal display on the operation unit, changes the approximate size by pressing a key. Works.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an image forming apparatus according to the present invention, wherein 1 is a main central processing unit (main CPU), 2 is an operation unit CPU, 3 is a sequence CPU,
Reference numeral 4 denotes a manual guide detection device, and reference numeral 5 denotes a key matrix. Such an image forming apparatus is mainly a digital copying apparatus, and the conveyance of paper is based on a center, but the reading of a document is based on the right front in consideration of the operation name of a document set. Therefore, the position where the data read by the scanner (not shown) is written on the photosensitive drum (not shown) differs depending on the paper size. Therefore, from the synchronization detection position of the laser diode (LD) (not shown) to the writing position of the image is called RGATE, and from the writing start to the end is called LGATE.
The writing position on the photosensitive drum is adjusted by changing RGATE and LGATE for each paper size. In the case of copying using a cassette, a filer corresponding to the cassette size is added, which is read from a photo interrupter, and the size of the cassette is recognized by a combination of bits.

In the case of manual feed, a slider (not shown) slides in conjunction with a manual feed guide, connects to each terminal of a size detection plate (not shown), and detects the width of the paper by a combination thereof. ing.

Such an image forming apparatus uses paper of the same width in the case of specifications for overseas. For example, for North America, 11 ", 10 1/2", 10 "(279.4mm, 266.7mm, 254mm) 8/1
2 ″, 8.1 / 4 ″, 8 ″ (215.9mm, 209.6mm, 203.2mm) F4, A4 vertical, F (215.9mm, 210mm, 203.2mm) are used for Europe.

It is very difficult to detect all these sizes because it is very difficult to set the same width size in consideration of the margin for setting the paper in a guide (not shown). Is set in the guide, and the size is read by the manual feed guide detecting device 4, and another size is not shown in the liquid crystal display (LCD).
Is displayed in the key matrix 5 on the operation unit.
By pressing the "#" key, the size corresponding to the width of the guide is switched.

FIGS. 2, 3, 4, 5, and 6 are explanatory diagrams for explaining the LCD display for use in North America.

Open the manual feed table (not shown) and set to the manual feed mode. The currently detected guide width is displayed on the LCD (Fig. 2). In this case, the LCD display is 100% magnification display and 11 ″ guide width display.

The display is switched to a new size when the detected size changes by moving the guide little by little inward (FIG. 3). That is, the guide width is 11 ", 10", 8 1/2 ", 5
1/2 ”is detected.

If the size detected by moving the guide is 11 ", the"#"key of the key matrix 5 is pressed to make 10 1/2"
Switch to. Next, when the "#" key is pressed, it switches to 11 "(Fig. 4). When the detected size is 10", it is changed to 10 1/2 "by pressing the"#"key as in the case of 11". Switch. Next, the display is switched to 10 "by pressing the"#"key.

When the size detected by the guide is 8.1 / 2 ", the display is switched to 8.1 / 4" by pressing the "#" key of the key matrix 5 (FIG. 5). Next, when the "#" key is pressed, the value becomes 8 ", and then returns to 81/2".

Even when the width of the guide is changed by the "#" key of the key matrix 5, the guide is moved, and when another width is detected, the newly detected size is displayed (FIG. 6).

The paper width can be determined by the size of the guide, but the length of the paper cannot be detected. Therefore, copying is performed at the maximum size within the standard size as shown in FIG. 7 below.

FIG. 7 is an explanatory diagram for explaining the copy size based on the guide width. Copying is performed with a fixed sheet length based on the sheet width size.

FIGS. 8, 9, and 10 are explanatory views each explaining an LCD display for use in Europe.

Open the manual feed table (not shown) and set to the manual feed mode. The currently detected guide width is displayed on an LCD (not shown) (FIG. 8). In this case, the LCD display has a guide width A3 and the magnification display is 100%.

If there is a change in the detected size by moving the guide little by little inward, the display is switched to a new size (No. 9).
Figure). That is, A3, 4A, A4 length, B5 length, B6 length, and A6 length are detected.

If the size detected by moving the guide is A4 length, pressing the “#” key of the key matrix 5 switches to F4 size. Next, when the "#" key is pressed, the size becomes F size, and then returns to A4 length (FIG. 10).

Even if you switch to F4 or F size with the “#” key,
When the guide is moved and another size is detected, the display is switched to the newly detected size.

FIG. 11 is an explanatory diagram for explaining GATE when copying a sheet having a width of 10.1 / 2 "with a guide width of 11". In this case
11 "RGATE is shorter than 10 1/2" RGATE, and LGATE is longer. However, if the guide width is selected to be 10.1 / 2 "by the"#"key of the key matrix 5 and copied, the image can be correctly transferred to the paper.

FIG. 12 is a flowchart of the standby mode, and FIG. 13 is a flowchart of the standby mode.
14 shows the subroutine of the manual guide width check, and FIG. 14 shows the subroutine of the key input check of FIG. Twelfth
In the figure, a manual guide width check (S1) and a key input check (S2) are performed. The manual feed guide width check
13 As shown in FIG. 13, the change in the manual guide width is checked (S3), and if it changes, the size corresponding to the guide width is set (S4), and the L corresponding to the guide width size is displayed on the LCD.
The CD data is set (S5), and the LCD data is displayed on the LCD (S6).

As shown in FIG. 14, the key input check checks the ON / OFF of the "#" key of the key matrix 5 (S
7) If it is on, change the guide width size (S
8). In this case, for example, in the case of 81/2 ", 8/1/4"
In the case of 8.1 / 4 ", it becomes 8", and in the case of 8 ", it becomes 81/2"
Change to At S9, the LCD data corresponding to the guide width size is set, and the LCD data is displayed on the LCD (S10).

In the above-described digital image forming apparatus, since the paper conveyance is center reference and the document is right front reference, RGAT
E, LGATE is different. Naturally, if a size different from the size detected by the guide is copied, the position of the image transferred to the paper will be shifted. However, by selecting the guide width with the “#” key of the key matrix 5 and copying, the image can be correctly transferred to the paper.

〔The invention's effect〕

As described above, according to the present invention, unlike the paper size displayed on the liquid crystal display of the operation unit,
In addition, since there is provided selection means for selecting an approximate size that cannot be detected separately from the paper size due to the margin for setting the paper in the guide, the selection means selects an approximate size that cannot be detected by the guide of the manual feed table. In the case where the paper transport is the center reference and the original reading system is the right front reference, the paper size cannot be detected based on the guide width, and the position of the image transferred to the paper is shifted due to the shift of both references. Can be prevented and the image position can be copied exactly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an image forming apparatus according to the present invention, and FIGS. 2, 3, 4, 5, and 6 each illustrate an LCD display for use in North America. 7, FIG. 7, FIG. 9, FIG. 9, and FIG. 10 are explanatory diagrams each illustrating an LCD display for use in Europe, and FIG.
The figure is an explanatory view explaining GATE when copying paper of 101/2 "width with a guide width of 11", FIG. 12 is a flowchart of standby mode, and FIG. 13 is a guide width check of FIG. FIG. 14 is a flowchart of a subroutine of the key input check of FIG. 2 ... Operation unit CPU, 4 ... Manual guide detection device, 5 ...
... key matrix.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03G 15/00 303 G03G 21/00 370-540 G03G 15/36 G03G 21/02-21/04 G03G 21 / 14 G03G 21/20 G03G 15/00 510-534

Claims (1)

(57) [Claims] An image forming apparatus having a manual feed table and performing manual feed from the manual feed table to perform manual copy, wherein the manual copy is performed by moving the paper so as to match a position of a desired paper size. A guide provided movably in the direction perpendicular to the sheet feeding direction on the manual feed table so as to guide the manual sheet feeding by abutting against an edge, and detecting a sheet size by a guide width according to the position of the guide. Paper size detection means, a liquid crystal display of an operation unit for displaying the paper size detected by the paper size detection means, and a paper size different from the paper size displayed on the liquid crystal display of the operation unit, and Select an approximate size that is in a range that cannot be detected separately from the paper size due to the margin for setting An image forming apparatus comprising: