JP2652021B2 - Image forming device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Industrial Application Field) The present invention relates to an image forming apparatus for forming an image by reducing a large document wider than a readable area of a document reading section in a copying apparatus or the like.

(Prior Art) In general, in an image forming apparatus such as a copying machine, it is a principle that an original to be read is reproduced on a recording sheet at a magnification of 1: 1. Match the recording paper. For example, when A3 size recording paper can be fed, the document readable area is substantially equal to A3. And the scaling to reduce or enlarge the original is
This was possible within the range of the size in which the original could be completely read by the original reading unit (the original should be smaller than the size of the original platen) and within the range of recording paper that could be fed by the printer unit.

However, in the case of a normal black-and-white copier, most of the originals are
Since the size of the document was at most A3, it would have been good if the size of the document reading section could read up to A3, but there are many multicolor documents such as maps and wiring diagrams that are larger than A3. I do. Therefore, if you want to reduce and copy a document whose size is larger than the document reading area, keep the reduction ratio constant, copy the document into parts and parts, and paste the resulting copy. After that, the recording paper had to be cut to the desired size.

That is, as shown in FIG. 10 and FIG.
A, b, c, and d are divided into a-1, b-1, and c, respectively.
-1, and a reference point represented by d-1 deeds reduced copy of ^{A3 → A5 a R, b R} , c R, to obtain d ^R, the bonded them 11
A copy 151 of A3 shown in the figure was made to obtain a desired copy.

(Problems to be Solved by the Invention) However, in the case of such a conventional technique, when an original whose size is larger than the readable area of the original reading unit is to be reduced and reproduced, the original is partially reduced at a desired reduction ratio. Since a plurality of copies must be stuck together after being reduced in size and reproduced, the displacement at the time of stitching and the stitching allowance may be partially thickened, which may cause a problem in use.

Therefore, the present invention has been made to solve the above-described problems of the conventional example, and an object of the present invention is to reduce the time and effort required when forming an image by reducing a document larger than a document reading unit. An object of the present invention is to provide an image forming apparatus which eliminates the above disadvantages.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, there is provided a transparent document table, reading means for reading a document placed on the document table, Image forming means for forming an original image on recording paper, and reading an original larger than the readable area of the original mounting table by dividing the original into a plurality of areas, and recording the entire original on the same image of one recording paper In a possible image forming apparatus, a lighting indicator is provided at each of the four corners of the document mounting table indicating a document abutting reference, and when a document larger than a readable area is divided into a plurality of areas and read, a document is read. The lighting display sections at the four corners are sequentially turned on so as to indicate the order in which the four corners are abutted.

(Operation) In the first invention having the above-described configuration, when the large document wider than the readable area of the document reading unit is reduced to form an image, the placement instruction unit is held while the recording paper is held by the holding unit. A large original is partially read at least two times or more on the basis of the above, and the read information is formed on a recording sheet in accordance with the reading order, whereby the large original can be formed on a single sheet of recording paper. Things.

(Example) Hereinafter, description will be made based on the illustrated example of the present invention. FIG. 1 shows a multicolor image forming apparatus to which the first embodiment of the present invention is applied. In the figure, X is a document image input device (hereinafter referred to as a reader) as document reading means, and Y is a device (hereinafter referred to as a printer) as image forming means for forming a color image on a recording material. First, the reader will be described.

The reader X has a document scanning optical system for reciprocatingly scanning a document. In the figure, reference numeral 0 denotes a document, and reference numeral 3 denotes a platen glass serving as a document table. Reference numeral 4 denotes an image reading unit, which comprises an optical element 41, a reflecting mirror 42, an illumination lamp 43, and a light receiving element 44, moves from the position 4 to 5 when scanning the original, and returns to the position 4 again. The reading unit 4 is connected to the main body of the reader by a cable 6, and transmits the read signal to the main body of the printer via the main body of the reader. Reference numeral 9 denotes a motor for driving the reading unit 4, which transmits rotation to the pulley 7 via a timing belt 8 to move the reading unit 4. The reading unit 4 moves by a distance indicated by l in the figure.

Next, the printer Y as an image forming means will be described. 1 is a photosensitive drum constituting an image bearing member;
Is rotating in the direction of. Around the photosensitive drum 1, a charger 12, a developing unit group 13, a transfer drum 20, and a cleaner 27 are arranged. Reference numerals 10 and 11 denote laser optical systems which form an image on the photosensitive drum 1 in response to a signal from the reader X. 10 is a polygon mirror, and 11 is a laser reflection mirror.

The developing device group 13 includes developing devices 131, 13 of the same type using yellow, magenta, cyan, and black developers, respectively.
Consists of 2,133,134.

When an image of a specific color is formed on the photosensitive drum 1, the developing unit 131, 132, 133 or 134 of that color forms an image adjacent to the photosensitive drum 1 and forms an image of a different color. Rotates in the direction of arrow 135 to bring the developing device of a desired color adjacent to the photosensitive drum 1.

Reference numeral 15 denotes a cassette for storing recording paper 14 (usually, plain paper is used). The recording paper 14 (hereinafter referred to as transfer paper) in the cassette 15 is fed by a paper feed roller 16 to the cassette 15.
The sheet passes through a first pair of registration rollers 17 and a second pair of registration rollers 18 and is fed to a paper feed guide 19. When the transfer paper 14 is fed, the first and second registration rollers 17,1
The timing is taken by 8, and the tip is held by a gripper (not shown) on the transfer drum 20. The transferred transfer paper 14 passes between the suction charger 23 and the squeezing roller 22 and is held by suction on the suction sheet 202 on the transfer drum 20 over the entire area. The image on the photosensitive drum 1 is transferred to the transferred transfer paper 14 by the transfer charger 24. The transfer process is repeated for each color. When the transfer is completed, the gripper is opened and guided to the transport unit 29 by the separation claw 28. The transfer paper guided to the transport unit 29 is fixed through a pair of fixing rollers 30 and 31, and is placed on a tray 32.

Reference numerals 25 and 21 denote cams for opening and closing the gripper on the transfer drum 20.

By the way, in the present embodiment, the moving distance l of the reading unit 4
And the length of the optical element 41 in the depth direction is the maximum readable area of the reader. Normally, the maximum readable area is determined by the size of the transfer paper that is used every day.
A3 size. The transfer drum 20 holding the transfer paper 14 can hold the transfer paper (A3) having the same size as the maximum readable area in consideration of the maximum readable area. For example, when an A3 document is reduced to A4, the image reading unit 4 moves the A4 transfer paper with respect to the peripheral speed of the transfer drum 20 while the longitudinal direction of the A4 transfer paper is held so as to coincide with the circumferential direction of the transfer drum 20. Constant To read the original, and transmit the image information to A4 transfer paper on the transfer drum 20. This is the image reading unit 4
In the direction perpendicular to the moving direction, the information obtained by the image reading unit 4 is thinned out and A3 is converted to A4 and transmitted.

Next, the operation of this embodiment will be described with reference to FIGS. 2 and 3. In this embodiment, the platen glass 3 is substantially equal in size to a transfer paper (for example, A3) that can be used by the apparatus. . In the vicinity of each corner of the platen glass 3, lighting lamps 51, 52, 53 and 54 are provided as lighting display portions. The light is turned on in the order of 51 to 54 by the placement instruction means for instructing the reference to match the base glass 3. FIG. 2 shows a state in which reduced copying is performed according to the lighting lamps 51 to 54 shown in FIG. First, in the large original 50 of A1, the copy button is pressed by aligning the corner of the area a-1 of the area a3 (A3) with the corner near the lighting lamp 51 which is illuminating, and reading the original in the area a. An image is formed on the transfer paper 14 on the transfer drum 20. Next, b-1 in the area b is adjusted to the corner where the lamp 52 is lit. The above operation is also performed for the areas c and d, and a reduced image is obtained on the transfer paper 14 on the transfer drum 20.
In FIG. 2, a reading area is set to be narrow on the platen glass 3 and always the same size. In the second and subsequent reading operations, L ₁ and L in FIG.
Each of the _two portions is corrected and read, and an image is formed so as to match a previously formed image. Here, even if the size of the non-read area in each reading operation is changed for each operation, there is no problem if the correction is performed at the time of reading. The transfer drum 20 may or may not be rotated during each operation (the time from moving the document to pressing the copy button).

In the above embodiment, the copy button is used as a start switch between image readings. However, the present invention is not limited to this. For example, the copy button is used in conjunction with the lighting of a lighting lamp arranged around the platen glass 3. Is also good.

Next, a second embodiment of the present invention will be described with reference to FIGS. In FIG. 4, reference numeral 61 denotes a document table glass on which a document is placed, and an exposure scanning table 70 includes a fluorescent lamp 71 for exposing the document, a rod lens array 72 for condensing light reflected from the document, and It has a solid-state image sensor 73 that converts a corresponding light image into an electric signal, and is pulled by Japanese driving wires 74, 74 and moves forward or backward in the direction of the arrow. Reference numeral 75 denotes a transmission line for driving signals and image signals of the solid-state imaging device 73, and is connected to a circuit of an image forming unit (not shown). Reference numeral 76 denotes a reference member attached to one side of the exposure scanning table 70. At a reference position (for example, a reading start position) of the exposure scanning table 70, a sensor 77 is provided.
Is to be detected. That is, the position of the scanning table 70 is detected by the sensor 77. Reference numeral 78 denotes a drive motor for rotating the pulley 79, and the drive motor 78
When driven, the pulley 79, the exposure scan table through the wire 74
Move 70. The time when the exposure scanning table 70 moves in the direction of arrow A is when reading an image, and the direction B is the direction in which the scanning table 70 returns to the original position.

FIG. 5 shows the appearance of the original reading section 80 of the second embodiment,
In the figure, reference numeral 86 denotes a pressure plate for holding a document, which can be removed. The size of the platen glass 61 is substantially equal to the A3 size, and the range in which the
Is the maximum readable area. Reference numerals 82 to 85 denote lighting switches serving as placement instruction means that also serve as switches disposed at the four corners of the document table glass 61. The document reading section 80 is connected to a printer section 92 as an image forming means shown in FIG. 9, and can perform printing in accordance with a reading signal of the document reading section 80.

FIG. 6 and FIG. 7 show a procedure and a way of storing when reducing A2 → A3 and A1 → A3 according to the present embodiment.
6 (c) and 7 (c) show the storage status of the memory. In FIG. 6, the vertex b of the document (A2 size) 100 is set to the lighting switch 82 for indicating the reference position, the document of A3 size is read on the platen glass 61, and the read image information is reduced to ninth. The data is stored in the memory 91 as the storage means by the control means 90 shown in the figure. Then manuscript 10
Set the vertex d of 0 to the lighting switch 83, and set
00 is read and stored in the memory 91 in accordance with the previously stored information. Thereafter, all the information stored in the memory 91 is sent to the printer unit 82, and a desired reduced copy can be obtained on one sheet of recording paper. On the other hand, in FIG. 7, the vertex a of the document (A1 size) 110 is set to the lighting switch 82 for indicating the reference position, the document of A3 size is read on the platen glass 61, and the read image information is reduced. Then, it is stored in the memory 91 by the control means 90 shown in FIG. Next, the vertex b of the document 110 is set to the lighting switch 83, the document 110 is read in the same manner as the previous time, and the memory 91 is read in accordance with the information stored last time.
To memorize. That is, in FIG. 7, the image information is stored in the memory 91 by changing the position of the original 110 with respect to the original platen glass 61 four times. FIGS. 8 and 9 show the flow chart and the block diagram described above.

Here, in the second embodiment, the storage area of the memory 91 is A3
However, since the size of the recording paper is set to A3 size, in the case other than A3, the size may be stored in an area corresponding to each size.

In the present embodiment, the lighting switches 82 to 85 disposed around the platen glass 61 can also be used as start switches for starting reading when the reference of the document is matched, and the reading operation can be performed as desired. Is completed, instructions are always given in a predetermined order, in the order of the lighting switches 82 to 85.

(Effects of the Invention) The image forming apparatus according to the present invention has the above-described configuration and operation, and is conventionally required for recording a large-sized document larger than the readable area of the document reading unit to form an image. Is unnecessary, and as a result, the thickness of the recording paper becomes uniform, the handleability is improved, and the reduced image can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a multicolor image forming apparatus to which the first embodiment of the present invention is applied, and FIGS. 2 (a), (b) and (c) show an image reading and image forming order of the embodiment. FIG. 3 is an explanatory view showing an arrangement of a lighting lamp in the embodiment, FIG. 4 is a perspective view showing an internal mechanism of a document reading section in a second embodiment of the present invention, and FIG. Perspective view showing the appearance of the part,
6 (a), (b) and (c) show the image reading of the embodiment,
7A, 7B, and 7C are explanatory diagrams showing the image storage order.
(C) is an explanatory view showing another example of the image reading and image storing order of the embodiment, FIG. 8 is a flowchart of the embodiment, and FIG.
FIG. 10 is a block diagram of a control system in the embodiment, FIG. 10 is an explanatory diagram showing a conventional reduced image forming order, and FIG. 11 is an explanatory diagram showing a copy created by the conventional example. Reference numerals 0: Original, 3: Original platen glass 4: Image reading unit 14: Recording paper (transfer paper) 20: Transfer drum (holding means) 50: Large original 51 to 54: Lighting lamp (Placement instructing means) 61: Original platen glass 80: Original reading section (original reading means) 82 to 85: Lighting switch (Placement instructing means) 90: Control means 91: Memory (storage means) 92 ... Printer part (image forming means) X ........ reader (document reading means) Y ........ Printer (image forming means)

Claims (1)

(57) [Claims] An original mounting table comprising: a transparent original mounting table; reading means for reading an original placed on the original mounting table; and image forming means for forming a read original image on recording paper. In an image forming apparatus capable of reading a document larger than the readable area divided into a plurality of areas and recording the entire document on the same image of one sheet of recording paper, a portion indicating a document abutting reference at four corners of the document table. Are respectively provided, and when a document larger than the readable area is divided into a plurality of areas and read, the four corners of the document are sequentially lit to indicate the order in which the four corners of the document are abutted. Characteristic image forming apparatus.