JPS60102655A - Image forming device - Google Patents

Abstract

PURPOSE:To select a form of an optimum size, and to display its form size when a form of an optimum size is not selected, by deciding a form of an optimum size for forming an image in combination of an original size which has detected the size of an original, and an image forming magnification to be set. CONSTITUTION:Each information obtained from an original size detecting means 94, a magnification setting part 88 and a form size detecting means 95 is inputted to an arithmetic part 96, respectively. The arithmetic part 96 decides a form of an optimum size for executing copying by original size information and magnification information, and checks whether a form of its size exists in a feed paper cassette installed to a copying machine body or not, by referring to form size information from the form size detecting means 95. As a result of this check, if said form exists, a feed paper cassette in which a form of a size corresponding to the decision result is contained is selected from the feed paper cassettes installed to the copying machine body. However, on the other hand, if said form does not exist, namely, in case when a form of an optimum size for executing copying does not exist, its form size is displayed by flickering on a size indicator 86.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as an electronic copying machine.

[Technical background of the invention and its problems]

Conventionally, for example, in an electronic copying machine in which multiple sheets of paper of different sizes can be set, the method for selecting the paper is for the user to select and operate paper selection keys provided on the operation panel. It is being However, in such a method, since the user makes a selection each time, selection errors are likely to occur, resulting in a problem of erroneous copying. %, with copying machines equipped with enlargement and reduction functions, depending on the combination of document size and copy magnification, the copy image may not fit on the paper, or
Or, if the margins are too large, this often leads to mistakes in copying.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to automatically select the optimal size paper for image formation according to the document size and image formation magnification, and to An object of the present invention is to provide an image forming apparatus that displays the paper size and notifies the person concerned when the paper size is not set.

[Summary of the invention]

The image forming apparatus of the present invention detects the size of a document, determines the optimal size of paper for image formation based on a combination of the detected document size and a set image forming magnification, and determines the optimal size of paper for image formation based on the result of this determination. The configuration is such that the paper of the optimum size is selected, and if the paper of the optimum size cannot be selected, the paper size is displayed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an electronic copying machine equipped with a document feeder (hereinafter simply referred to as ADF) as an example of an image forming apparatus according to the present invention. That is,
Reference numeral 1 denotes the main body of the copying machine, and on the top surface of this main body 1 there is provided an original platen (2 transparent plates) 2 for holding originals, and on this original platen 2, an ADF 3 is provided which can be opened and closed freely. There is.

On the lower surface side of the document table 2, an exposure optical system 10 includes an exposure mirror 5, 6.7 that reciprocates in the direction of the arrow shown in the figure, a lens lock 8 that is movable in the optical axis direction, and a fixed mirror 9. is provided, and by optically scanning the surface of the document using this optical system 10, an image of the document is formed on the surface of the photoreceptor drum 11 (slit a source). The photosensitive drum 1 rotates in the direction of the arrow shown in the figure, and the surface is first charged by the charging device 12, and then the image is exposed to slit light to form a static paper stagnation on the surface. This static acid stagnant image is made visible by the adhesion of toner by a developing device 13, and is then removed by a pre-transfer static elimination rung 14.

On the other hand, the paper P is fed one by one from the selected upper paper feed cassette 15 or lower paper feed cassette 16 by paper feed rollers 17 or 18, and is guided to the registration rollers 21 through the paper guide path 19 or 20. and is guided to an image transfer section 22 by the registration rollers 21. Here, the above paper feed cassette 15.1
6 is removably provided at the lower right end of the main body 1, and one can be selected from an operation panel (not shown). Thus, the paper P sent to the image transfer section 22 is brought into close contact with the surface of the photoreceptor drum 1 at the transfer charger 23, so that the paper P is placed on the photoreceptor drum 11 by the action of the charger 230. The toner image is transferred. The transferred paper P is electrostatically peeled off from the photoreceptor drum 11 by the action of the peeling charger 24 and conveyed through the paper conveyance path 25, and a heat roller 26 serving as a fixing device is provided at the end of the sheet conveyance path 25. Transferred to 1, and by passing through here, transcription 1
Elephants are established. After the fixing, the paper P is discharged from the main body I by the paper discharge roller 27 and guided to the tray 28. Further, the photosensitive drum 11 after the transfer is returned to its initial state by removing residual toner on the surface by a cleaner 29 and erasing an afterimage by a static elimination rung 30.

The ADF J is composed of a feeding section 3 and a conveying section 32. The above-mentioned feeding section 31 includes a tray 33 as a document placing section that can place documents 0 all at once, a tray 4' 34 that temporarily holds documents 0 placed on this tray 33, a document feed roller 35, It has a take-out roller 36 and a registration roller 37. The tray 33 is tilted forward at an angle of approximately 30 degrees.
, t"' It llk l' IIQ can be dropped to the position of the IIQ output roller 36. Also, the stopper 34 can be rotated in the direction of the arrow shown with +11HJ g as a fulcrum, and can be rotated to the position of the tray 33. When holding a document, it protrudes above the tray 33 and holds the leading edge of the document 0, and when the solenoid 39 rotates downward and retreats below the tray 33, it holds the leading edge of the document 0. In addition, the document feed roller 3
Reference numeral 5 rotates in the direction of the arrow shown in the figure and moves up and down in conjunction with the protruding and retracting operation of the stopper 34, and at the same time as the stopper 434 retreats below the tray 33, it moves downward, and at this time, the document 0 falling under its own weight is moved downward. The document O is conveyed so that the document O at the top comes out in front. Further, the take-out row 236 is a pair of rollers that rotate in opposite directions to each other, making it possible to take out one document 0. The registration rollers 37 feed the document 0 taken out by the take-out roller 236 to the conveying section 32 at the appropriate timing, and also correct the skew of the document 1m.

On the other hand, the conveyance section 32 includes an endless belt 40 for conveying documents.
．． Rollers 41 and 42 on which this belt 40 is mounted, and rollers 43, 44, and 4 that press the belt 40 onto the document table 2.
5.46, a stopper 47 for temporarily holding the document 0 sent onto the document table 2, and a paper discharge roller 48 are provided.

The above-mentioned stocks 47 can be rotated in the direction of the arrow shown in the figure as a fulcrum of I11]495c, and are normally rotated in the direction of the arrow shown in the figure.
The leading edge of the document O is held, and when the solenoid 50 rotates downward, the state in which the leading edge of the document O is held is released. Note that 51 is a tray that receives the ejected original O, and is fixed to the main body 1.

Furthermore, the ADF 3 includes a detector 52 for detecting whether or not document 0 is present on the tray 33, a detector 53 for detecting that document 0 has been fed into the transport section 32,
A detector 54 is also provided for detecting that the original O has been ejected. Each of these detectors 52 to 54 is
For example, what about Mutsushirei? , to:j%D-Sma・,'-
It is composed of −・cchi, etc.

Here, the operation of the ADF 3 will be simply explained. First, documents 0 are placed on the tray 33 all at once. Next, in conjunction with the copying start operation, the solenoid 50 is activated to retract the stopper 47 to the bottom of the original 474 table 2, and the belt 40 runs to remove any originals that may remain on the document table 2. A discharge operation is performed. At the same time, the solenoid 39 operates to retract the stopper 34 below the tray 33, feed the original O on the tray 33 to the take-out roller 36 side, and take out the original O by the take-out roller 36. In this case, the registration roller 37
is in a stopped state for a certain period of time, during which time the document O is sent to the V-distorter roller 3f by the take-out roller 36, and the skew at the leading edge is corrected. Then, when the registration rollers 37 rotate, the original O is sent to the transport section 32. In addition,
When the registration roller 37 starts rotating, the take-out row 236 stops rotating and the stopper 47 returns to the holding position.

The document 0 sent to the conveying section 32 is conveyed by the belt 40 until it comes into contact with the stopper 47, and then stops. In this case, is the leading edge of document O in stop/J? The document 0 is aligned by continuing the running of the belt 40 for a certain period of time from the time when the belt 47 comes into contact with the belt 47. thus,
When original 0 is set on original table 2, copying is performed on original 0. When the copying is completed, the solenoid 50 is operated to retract the stopper 47, the belt 40 runs, and the copied original O is ejected from the original platen 2. This discharged document O is discharged onto the tray 5 by a paper discharge roller 48. This discharge! During operation, if the original O is detected by the detector 52, the above-described original take-out operation is repeated.

Further, at this time, when the discharge of the material 41 is detected by the detector 54, the stopper 47 is returned to the holding position 11q.

The ADF J configured in this manner is provided with a document size detecting means for detecting the size of document 0, which will be described below. As shown in FIG. 2(,), various sizes are displayed 61 on the front surface +Mi of the tray 33, and the document guide 62 is slid according to the width size of the document O. And 1. ! g2
As shown in Figure (b), on the back side of the tray 33 there is a
．． Rank 63 moves according to the movement of 4 guys 62.
64 is provided, and this rack 63°64
In the moving path, there are claws 65 attached to racks 63 and 64.
．． Micro switch 6 which is turned on and off by 66
7 to 71 are arranged in a predetermined positional relationship. As a result, the switches 67 to 7 are turned on and off depending on the position of the document guide 62 according to the width size of the document 0.
This allows the size of the document O in the width direction to be known. Here, the relationship between the size of document 0 and the on/off status of each switch 67 to 71 is shown in Table 1 below.

Table 1 Further, the lengthwise size of the document O is determined based on the time during which the detector 53 detects the document O. This can be done, for example, by sending the output 1g of the detector 53 to a calculation section (described later), measuring the detection time for document 0, and comparing it with a preset standard time for each size.
Determine the lengthwise size of.

Further, the copying machine configured as described above is provided with a paper size detection means for detecting the size of the paper in the set paper feed cassette, which will be explained below. As shown in FIG.
On the negative side (corresponding to the paper feed cassettes 15 and 16 in the figure), for example, one side (? By combining the number and position of 75 and installing the paper feed cassette 73 in the copying machine main body 1, three microswitches 76.7 provided in the copying machine main body 1 can be activated.
Of the switches 7.78, only the switch corresponding to the protrusion 75 is turned on by the protrusion 75, and the paper size is determined by the combination of on and off of these switches 76, 77, and 78. It looks like this. Here, the relationship between the size of paper P and the on/off status of each switch 76, 77, 78 is shown in Table 2 below.

Table 2 Figure 4 shows the operation panel, including copy keys 8 for executing copy operations, numeric keypad 82 for setting the number of copies, etc., and clear/stop key 83 for clearing the set number of copies or stopping the copy operation. , a number display 84 that displays the number of copies, a cassette selection key 85, a size display 86 that displays the paper size, a status display section 87 that displays the status, a magnification setting section 88 that sets the copy magnification, and a set A magnification display section 89 for displaying magnification is provided. The upper magnification setting section 88 includes a magnification setting key 90 for setting a predetermined specific magnification. . . . , and a magnification ag key 91 and a magnification gun key 92 for setting the magnification of bales.

Therefore, the document size detecting means (denoted by reference numeral 94)
, magnification setting section 88, and paper size detection means (symbol 9
Each piece of information obtained from 5) is shown in Figure 5. '+Tμ96 respectively. The calculation unit 96 calculates the optimal size of paper for copying based on the three pieces of manually input information (original size, magnification, and paper size).
/i, it is checked with reference to the paper size information from the paper size detecting means 95 whether or not a paper of that size exists in the paper feed cassette loaded in the copying machine main body 11. As a result of this check, if any exists, a paper feed cassette containing paper of the size corresponding to the above judgment result is selected from among the paper feed cassettes installed in the copying machine main body 1 according to the above judgment result. However, as a result of the above check, if the paper does not exist, that is, if there is no paper of the optimum size for copying, the paper size is displayed on the size display 86.
will be displayed blinking.

For example, when the paper feed cassettes for A4-H paper and B4 paper are installed, and the selected copy magnification is 141, and the document size detection means 94 detects the document as B5-R. , determines that the optimal size of paper is B4 paper, selects the paper feed cassette containing B4 paper, and starts copying. In this case, the paper size display remains "B4" even after the copying operation is completed. If A4-H paper is selected in the next copying operation, the paper size display at that point becomes rA4-RJ. If the optimal size paper is A3, the paper size display will be “A3”.
'' will be displayed blinking, and the medical photo e-e'4 state will be maintained with the document held in the correct position. Then, when the paper feed cassette containing A3 paper is loaded and the copy key 8 is turned on, the iMF cassette containing A3 paper is selected and the copying operation is started. Here, the paper sizes that are determined and selected based on the size of the original and the magnification are as shown in Table 3 below.

Note that the *marked areas in the table are A3 size up to 115 inches.

Table 3 With the configuration described above, it is possible to automatically select the optimal size of paper that fits the copy image on the paper, depending on the combination of the original size and copy magnification, and also to select the optimal size of paper. When the paper size is not set, the paper size can be displayed and the user can be informed. Therefore, mistakes in paper selection as in the past are eliminated, and erroneous copies do not occur, making it possible to always make good copies.

In the above embodiment, the size of the document is detected in the ADF, but the present invention is not limited to this, and the size of the document 4^ may be detected in the document table. Further, the document size detecting means and the paper size detecting means are not limited to those of the above embodiments, and may be of an optical type, for example.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to automatically select the optimal size paper for image formation according to the document size and image formation magnification, and when the optimal size paper is not set, An image forming apparatus capable of displaying and informing a user of paper size can be provided.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic longitudinal sectional front view of an electronic copying machine, Fig. 2 is a diagram for explaining document size detection means, and Fig. 3 is a paper size detection means. Figure 4 is a plan view of the operation/nine channel, Figure 5 is a diagram to explain the means.
The figure is a block diagram schematically showing the configuration of main parts. 2...Original table, 3...ADF, O...Original, 10
...Exposure optical system, 11...Photosensitive drum, 15.1
6... Paper feed cassette, P... Paper, 86... Size display, 88... Magnification setting section, 94... Document size detection means, 95... Paper size detection means, 96.・
・Performance'W part. Applicant's agent Patent attorney Suzue Niba (a) 2 Figure (b)

Claims (1)

[Claims] Image formation is performed by a size detection means for detecting the size of the document held on the document table, a magnification setting means for setting the image formation magnification, and a combination of the detection results of these size detection means and the settings of the magnification setting means. a determining means for determining the optimal size of paper for the purpose, a selection means for selecting the optimal size of paper from among a plurality of sheets of paper set in advance according to the determination result of the determination means, and this selection means image forming means for forming an image corresponding to the image of the document held on the document table in accordance with the setting contents of the magnification setting means on the paper selected by the image forming means; and a paper of the optimum size by the selection means. 1. An image forming apparatus comprising: display means for displaying a paper size when a paper size cannot be selected.