JPS62270969A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent a failure caused by the error of a measurement, by comparing an original size to be measured and a fixed form size, and regarding it as a fixed form size, when the result of comparison is a prescribed state. CONSTITUTION:A CPU 201 is a microcomputer for controlling each indicator, and the display contents are based on an instruction (communication) data of the CPU. When a copy start key is depressed, an optical system executes a full scan and the original position size of an original placed on an original platen glass base is detected by a CCD. When the original size is detected, if an automatic magnification selection AMS is selected, vertical and horizontal magnifications are calculated from the size of the original and a selected form, and when its smaller one is set as an optimum magnification and an automatic selection is executed, a picture being free from an image omission is obtained. Also, if an automatic form selection APS is selected, the original size is multiplied by a selected magnification, the minimum registered cassette size containing its image size is decided to be an APS optimum size, and the size is selected from a mounted cassette. In such way, after the magnification form size is determined, a copying operation is started.

Description

[Detailed description of the invention] 3. Detailed description of the invention 〔Technical field〕 The present invention relates to an apparatus for forming an original image on a recording material.

(Prior Art) Conventionally, in image forming apparatuses such as copying machines, it is known that the document size is detected and the copying operation is controlled according to the detected size.As a method for detecting the document size, There is something on the base glass that detects the size of the document placed on it.

Conventionally, most of the methods for detecting the size of a document on a document glass have only had a function of determining only a limited number of standard sizes. Therefore, with only this function, amorphous size,
It is impossible for the apparatus to judge whether the document is set in a wrong position or the like.

On the other hand, a method of detecting the document size with higher accuracy using a CCD or the like is being put into practical use in some cases. According to this method, it is possible to detect irregular sizes, but on the other hand, there is a possibility that the detected paper size of the standard size may not always match the regular value due to some poor installation, CCD measurement error, etc.

For this reason, AMS (
In the case of automatic magnification selection), this slight error causes a problem in that the copy magnification does not reach 100% even if the same cassette is selected.

[Purpose] The present invention has been made in view of the above points, and its purpose is to provide an image forming apparatus that can prevent problems caused by measurement errors when determining and determining the document size. It is about providing.

〔Example〕

1 to 11 show embodiments of the present invention.

FIG. 1 is a top view of the operating unit, and the functions of each key will be explained in order.

100a to 100e are function keys, which are arbitrarily set by each key on the operation unit. This is a copy mode storage and recall key, and can store up to 5 types of modes. In other words, it is possible to memorize the modes that users use on a daily basis, the unique magnification that each user uses,
Alternatively, it is possible to memorize a region designation area, etc., which will be described later, and it is possible to immediately set a desired copy mode by simply pressing one key. In this copying device,
Memory is always maintained by backup power.

Numeral keys 101-110 have the function of setting the number of sheets as well as inputting various data in various asterisk modes in combination with the asterisk key.

Reference numeral 111 is a clear key for clearing the set number of copies or data, and reference numeral 112 is a reset key for returning the set mode to a predetermined standard mode, returning to the normal copy mode. 113 is a preheating key, and 114 is an asterisk key for shifting to various asterisk modes. Reference numeral 115 is a copy stop key, and reference numeral 116 is a color key for selecting a plurality of developing devices built into the main unit.When a color developing device is selected, a built-in LED 150 lights up as a warning.

151 is the copy start key, and when copying is possible (except when copying is in progress), the edge is displayed, otherwise the red LED1
51 is lit and displayed. Reference numeral 119 is an AE main key, which selects an AE mode in which a copy with an appropriate density can be obtained by detecting the original density and correcting the developing bias. In addition, A
When the E mode is selected, the display 152 lights up. 1
Reference numerals 18 and 120 are manual density adjustment keys, and the density level is set by key 118 . You can use 120 to get the density you want by going up or down. Note that if the key 118 is pressed, the density becomes high (dark), and if the key 120 is pressed, the density becomes low (light), and the density level of the display 153 changes accordingly.

152) 153 is a display group indicating concentration conditions. 15
4 is a 7-segment display that displays the number of copies.

Reference numeral 121 is a cassette selection key, which is used when manually selecting a cassette stage. Note that this device supports automatic paper selection (Auto Paper 5select: A
PS) It also has functions. 155 is cassette selection key 1
This is a group of displays indicating the stage selected at 21 or APS mode.

122 is a fixed enlargement magnification selection key, 123 is a fixed reduction magnification selection key, and 124 is an automatic magnification selection (Aut).

Magnification 5 select:
AMS) key, which has the function of automatically selecting an appropriate magnification based on the detected original size and the selected cassette size. Note that if the AMS mode is selected, the display 158 lights up. 125 is a zoom key, which allows the magnification to be adjusted in 1% increments using the 10 key and the - key. 126 is the same size key, which sets the copy magnification to the same size (
100%). Note that the display 157 lights up in the same-size mode.

Reference numeral 156 is a dot matrix type fluorescent display tube, which normally displays the set copy magnification, selected cassette size, copy mode, etc., and is useful in the event of an abnormality in the device, a user's incorrect operation, or complicated operations. It also functions as a message display for instructions, etc.

127 uses the intermediate tray in the main unit to automatically copy two single-sided originals onto both sides of one sheet of paper [single-sided → double-sided]
128 is a copy selection key for copying from a double-sided original to one side of two sheets of paper using the automatic circulation document feeder (RDF) [duplex → single-sided] copy selection key; 129 is an intermediate 1 double-sided original using tray and RDF
This is a copy selection key (duplex → both sides) for copying onto both sides of a sheet of paper, and 130 is a multiple copy selection key for overlapping two or more images on one sheet of paper to make multiple copies using an intermediate tray.

Note that when any one of the keys 127 to 130 is pressed, one of the indicators 159 to 162 lights up correspondingly.

Reference numeral 131 is a page continuous copying selection key, which allows exposure scanning of the original on the document table into two halves, left and right, to obtain two copies (referred to as A copy and B copy) with a single operation. Select the mode to use.

Reference numeral 132 is a page continuous copy multiple copy selection key, which has a function of multiple copying A copy and B copy in the page continuous copy mode described above onto the same sheet.

Reference numeral 133 is a page continuous copy double-sided copy selection key, which has the function of copying the above-mentioned A copy and B copy onto the front and back sides of the same sheet using the intermediate tray. Reference numeral 134 denotes a frame portrait key which has the function of erasing the edges of the book or the shadows that appear in the center of the two-page spread in the page continuous copying mode.

Reference numeral 135 is an image shift key, which allows the image to be shifted in either the left or right direction.

You can also adjust the shift amount by pressing the numeric keypad while holding this key. Also, this shift amount is also 1ooa
It can be stored in memory using the -e function key.

Reference numeral 136 is an area designation key, which also serves as a release key for the area designation area. Furthermore, two modes can be selected for area designation: document priority (the size of the designated area is variable depending on the magnification ratio) and cassette priority (the size of the designated area is constant regardless of the magnification ratio). Reference numeral 137 indicates an X/Y key, which is a data input key when inputting area designation using the numeric keys.

138 is a 4n/out key, which is a selection key for selecting whether to develop the inside of the designated area or only the outside.

Reference numeral 139 is a modification key, which is a data recall key for calling and modifying a set area value.

Reference numeral 140 is an automatic switching key for internal or external cutting (in/out) of an area in multiple copying and development color, and when this mode is selected in multiple copying, A copy and B copy are selected. automatically 1n10ut
.

Colors can be switched.

141 is a color automatic switching key for page continuous copying;
It has a function of automatically switching the developing color during the A copy and B copy described above, and when the key 141 is pressed, the display 170 lights up.

Each of the LEDs 157 to 171 is a selection mode display group indicating that each mode is selected. Reference numerals 172 to 174 indicate the number of set areas, and in this copying apparatus, up to three areas can be set. 175°176
is a display section indicating inner/outer connection, which lights up in the mode set with the key 138. The values of the set area for the 177 LED group are Xm1n and Xmax.

This is an indicator that indicates whether it is Ymin or Ymax. 142 is an area designation key by CCD;
By pressing this switch, the optical system starts scanning,
Executes only the function that recognizes the area drawn on the document.

143 and 144 are a sort key and a collate key, respectively. Reference numerals 178 and 179 are indicators for displaying sort and collate modes, respectively.

FIG. 2 is a basic block diagram showing the configuration of the display section.

The CPU 201 is a microcomputer that controls each display, and controls the display elements, and the display contents are based on instruction (communication) data from the main body CPU.

206 is a 5×7 dot/10 character fluorescent display tube. 7 bits x 5 bytes of data are required to constitute one character, and according to instructions from the CPU 201, 35 bits of data are sequentially read out from the character generator 203, transferred to the shift register/latch driver 204, and then 5 bytes are generated by the shift register/latch driver 204.
Data of e minutes, that is, 35 bits, is latched. After this, the shift register latch driver 205 drives a digit signal that determines the timing to display one character, and one character is displayed. In this way, each character is dynamically lit, and the duty ratio is 1/40.
weak (due to blanking time).

In addition, 208 indicates other LED MATRIX of the display section.
It is driven by dynamic lighting.

In the above configuration, when the copy start key is pressed, the optical system performs a full scan, and the CCD detects the document position and size of the document placed on the document glass table.

However, the size detected here includes measurement errors due to the CCD, errors due to incorrect installation position by the user, and size errors due to slanted placement. Therefore, if it is below a certain tolerance, it is easier to use it in a standardized format. For example, even if the same size original and paper are selected, the optimum magnification may not be 100% due to the above-mentioned error.

However, when standardizing here, there is no point in blindly determining the closest paper size, so the standard is only the registered paper size. In other words, if the paper size is not within the range of registered paper size ±X, it is considered a non-standard size,
The detected size is treated as the document size. On the other hand, if it is determined that the original size is a standard size, the standard size is treated as the document size instead of the detected size.

On the other hand, if a feeder is used as the document size detection means, a method of detecting the document size by counting the time for passing through the feeder path may also be considered. Since this method has many errors, size detection is limited to a certain standard size. In other words, non-standard sizes are forced to become standard sizes.

However, since this method does not require blisscanning for size detection, copying speed can be increased.

Therefore, when copying non-standard size paper through the feeder, you should expect size detection by CCD rather than size detection by the feeder (register the detection means as "CCD input". The document size is detected in this way. If AMS is selected, the vertical and horizontal magnifications are calculated based on the document and the selected paper size, and the smaller one is automatically selected as the optimal magnification, thereby obtaining an image without image defects.

If APS is selected, the document size is multiplied by the selection magnification, the minimum registered cassette size that includes the image size is determined to be the APS optimum size, and this size is selected from the installed cassettes.

After the magnification paper size is determined in this way, the copying operation is started.

FIG. 3 shows the flow for determining these document sizes.

It is determined whether the start key is pressed and a document is set in the feeder (■). If it is set in the feeder, pull in the original and measure the original size. However, if the user has already specified CCD detection here, this measurement value will not be used (■).

■).

Also, when it is not set in the feeder, it is treated as normal pressure plate mode copying, and the CCD uses prescan to measure the document size more accurately. (■) Next, the paper sizes that have already been registered are loaded in descending order. Then, it is determined whether there is a document measured within a certain error value (referred to as △x1Δy) in both the vertical and horizontal directions (■).If both the vertical and horizontal directions are within a certain error value, the standard size (registered) is determined. Size), and the standard value is given priority over the measured value (■).In other words, the difference from the measured value is interpreted as a measurement error.However, in reality, the value is intentionally shifted. Or, non-standard sizes are rarely used. For this reason, there are times when it is preferable not to perform this series of standardization processing.Therefore, in step (2), it is determined whether the specified size exists in any of them.

Here, the user designation used in the determination of (1) and (4) is based on the data stored in the RAM (described later), which is specified by the user in advance at the operation unit using the software SW.

Next, registration of APS options will be described in detail.

This registration can be performed using a software switch on the operation unit in the service asterisk mode.

First, press the service switch (not on the control panel) to enter the preparation stage, and from then on you can control it using only the keys on the control panel.

This mode is a mode that can be entered by pressing keys in the order of "*", ", '*" (n is a numeric keypad from 0 to 9), and is called the asterisk mode. By pressing the service switch, it is possible to shift to a mode different from the user mode, and this state can be canceled by using the reset key, auto clear, power on/off, etc.

The above APS registration is one of the mode switch group and is “*5*
The current mode can be easily checked using the message display.

Further, selection from among the mode switch group is performed using the zoom key. That is, the zoom key departs from its original function of increasing/decreasing magnification and, in this asterisk mode, performs the function of selecting a mode switch (just like turning a page).

At this time, “MS-8APS Touroku A3-→l” appears on the display.
*" is displayed.

At this time, if the ASP is registered, 1 is displayed, and if it is not registered, O is displayed. That is, the upper display shows that A3 is registered. If the "*" key is input in this state, the result will be O and the registration will be non-registered. Thereafter, the status will be reversed by inputting "*". Furthermore, when the cassette selection key is input, the paper size is changed and the current registration/non-registration status can be checked and updated.

In this way, by pressing the cassette key, existing cassette codes are sequentially called up and can be registered or unregistered.

Also, APS registered techniques are stored in RAM, so CPU
Since it is not possible for all of them to be unregistered or registered at the time of initialization (when the memory is cleared), the AB series for Japan and Europe and the inch series for North America should be stored in the memory as standard.

FIG. 4 is a flowchart related to universal cassette registration. In the service asterisk mode, use the key on the operation panel to call up the V-S (abbreviation for universal small) registration mode ([phase]).

At this time, the message part is displayed as follows.

U-3 cassette recording (O: free, l: free) -→φ” In other words, φ is registered, that is, in arbitrary mode, and is registered as a normal universal.

At this time, inputting "l" selects fixed mode (0), inputting "φ" selects arbitrary mode (0), and inputting "*" completes registration (Q).

If "0" (optional) is registered at this time, the corresponding U-5 will be registered (
@).

If "l" (fixed) is registered, then manually enter the horizontal size using the numeric keypad ([phase]). Complete the size data input by entering “*” ([phase]).

However, data outside the range will not be registered (◎).

Similarly, enter and register the vertical size to complete the registration of the v-S cassette ([phase]).

The universal cassette whose size is registered in this way is
Unlike conventional cassettes, it can be handled like a normal cassette.

If the "R" key is input during these setting modes, the series of asterisk modes will be canceled and the normal mode will be restored ([phase]).

Next, FIG. 5 shows the legal flow for APS selection. As before, call the APS selection technique registration mode in the asterisk mode (o). Here, it refers to the cassette size that can be the optimal cassette when performing APS selection method APS, and input whether or not to register each existing cassette size as an option.
For Nimatsu, it is standard to register the A-R Hata series cassette size, and for North America, it is standard to register the 1nch series cassette size. Changes to these standards are made in this mode. In other words, if the B series is not used in Europe, the B series cassette size is deregistered to prevent it from being selected, and the 1nch
, For users of both AB series, please register both cassettes (Also, as mentioned earlier, if you register the size of the U cassette, it can be eligible for APS, so you can register it. .

The flow will be explained below.

Initially, the cassette code (C3T-No.) is set to 1 (@), and the display at this time is as follows.

APS timer (0: free, l: timer)
A3-→I", that is, A3 is registered as an APS option. If you press the "*" key in this state, φ and 1 are inverted, and registration and non-registration are alternated ([phase] .

@).

Also, if you enter the cassette key, the cassette code (C5
T-No) is incremented and the next cassette size and registration status are displayed ([Yes], @).

Similarly, registration or non-registration can be specified for all cassettes.

FIG. 6 shows the flow of internal processing for rearranging the APS-registered cassette sizes in descending order as described on the previous page. Internally, the cassette codes registered with APS are rearranged vertically and horizontally in descending order of cassette codes.

The idea of the flow shown is to determine whether all existing cassette sizes are registered in ascending order and arrange them (
. However, since the universal cassette differs depending on the user, it is inserted as a comparison target throughout the flow (0° [phase]).

If each is registered, register the cassette code to the address shown in APS-3TACK (■)
, the address is incremented by one (O).

By repeating these steps, the cassette codes are finally registered in ascending order from the initial value address.

Set 00 as data at the end (this allows the CPU to
(o)

It is assumed that the arrangement of these cassette data strings is changed in two types: vertically long and horizontally long.

FIG. 7 shows the APS decision flow.

The image length is calculated by multiplying the determined document size (see FIG. 3) by the specified magnification (O). At this point, anything that exceeds the maximum paper frame will be warned as an error (o.

■).

Next, determine whether the image length is vertical or horizontal (o), and compare the lengths of the registered cassette sizes one after another in the order in which they have been arranged (@, @). When the cassette size length exceeds the image length for the first time, that cassette size becomes the optimal cassette ([Yes], O).

Once the optimal cassette is determined in this way, it is then determined whether the cassette is installed (@l). If it is installed, select that cassette and complete the APS (@l). If not, a warning will be displayed ([phase]).

? 1R171sunrPTTIIIse"/to11'tm (7)
T? AM2+ 7 Kasa, t- flowchart shown,
FIG. 8-2 is a RAM structure diagram.

The data RAM of this copying apparatus is constantly stored by a backup battery. Therefore, when resetting the CPU, it is necessary to grasp the current situation and properly initialize the RAM.

In the RAM configuration shown in Figure 8-2, Zone A is a part that is always stored, and stores various high voltage output data, software SW data such as APS selection semi-standard mode function mode and document size standardization described on the previous page. The B zone is a part that should be cleared (initialized) at every other reset.

This will be explained according to the flow shown in FIG. 8-1.

1 when the CPU starts up (91). Determine whether the keywords on the l/- are equal to the regular ones (92). If they are not equal, it may be the first startup of the CPU or destruction of RAM data, so check the initials of all data (A zone, B zone). (97°98) and stores the keyword (96).

On the other hand, if they are equal, the data in the permanent memory is left unchanged and the process continues.

(93) determines whether the current time is JAM (data R
by AM). After this, if there is a JAM, data such as the sequence up to that point is required for JAM correction.
The initialization of the B zone following step 94) is not performed. Otherwise, regular B zone initialization (94
).

At this time, data initialization is performed for some software switches such as the size detection selection switch (COD is the feeder), etc. (the one used is the standard).

Also, the copy mode displayed on the operation unit is changed to standard mode (95). Since the standard mode can also be optionally registered in this copying apparatus, this mode is for loading from the RAM A zone.

Also, when the R key is pressed during operation (standby), this (95) is executed.

FIG. 9 shows the registration flow in standard mode.

Call standard mode registration mode in asterisk mode (
101) At this time, "Initial data *" in the message display area is displayed (120).

If the "*" key is input in this state, the currently displayed mode is registered as the standard mode (105). At this time, if the cassette is not APS, the installed cassette size is also stored at the same time as the selected stage.

Also, when the "R" key is input, the asterisk mode is canceled (104) (106).

FIG. 1O is a flowchart of the cassette priority registration mode.

Call the cassette priority selection mode in the asterisk mode (111).

At this time, the display section shows “Cassette usage O: Size, 1: Tier) -→0”
It is shown that size is currently given priority (=φ) (112). If you enter 1 here (115),
The paper feed stage will be prioritized (116), and if you enter 0 (
113), which means giving priority to the cassette size (11
4), these are registered by pressing the “*” key (1
18).

Also, when the "R" key is input, the asterisk mode is canceled (119, 120).

FIG. 11 is a standard mode call flow. Main S
This mode is set (called) when inputting W, canceling preheating mode, inputting the reset key, etc. Basically, the mode registered in the standard mode is called (13
1).

Here, when APS is selected, APS is selected as expected (13
3), but when using manual, the following judgment is required.

First, determine whether the priority is cassette size or stage134)
, if size is given priority, it is determined whether a registered cassette size is installed (136). If the cassette is installed, the relevant setting is selected (137), and if it is not installed, the stage where the registered cassette was installed at the time of registration is selected (135).

On the other hand, if tier priority is originally registered, the corresponding paper feed tier is selected regardless of size (135).

〔effect〕

As described above, according to the present invention, the measured original size is compared with the standard size, and if the comparison result is in a predetermined state, it is regarded as the standard size, so that problems caused by measurement errors can be prevented.

Furthermore, by making it possible to select whether to represent the document size with actual measurement data or standard size data, it is possible to select whether to represent the document size with actual measurement data or standard size data, so that it can be used in cases where standardization processing would cause a large error, such as in the case of a non-standard size that is very close to the standard size. This also improves operability.

[Brief explanation of the drawing]

FIG. 1 is a top view of the operating unit of this copying machine, FIG. 2 is a block diagram of the operating unit, FIG. 3 is a document determination flowchart, FIG. 4 is a universal cassette registration flowchart, and FIG. 5 is a APS selection selection wall record flowchart, Figure 6 is an internal processing flowchart for rearranging the coats according to the size relationship of APS registered cassette sizes, Figure 7 is an APS (automatic paper selection) determination flowchart, and Figure 8-1 is an APS (automatic paper selection) determination flowchart. Flowchart of initialization of data RAM, Figure 8-2 is a conceptual diagram of the configuration of data RAM,
FIG. 9 is a registration flowchart for the standard mode, FIG. 1O is a flowchart for the cassette priority registration mode, and FIG. 11 is a calling flowchart for the standard mode. 156 is a dot matrix type fluorescent display tube, 15
1 is a start key, and 201 is a CPU that manages the display system.

Claims (3)

[Claims] (1) Detection means for detecting the document position; determining means for determining the size of the document from the detected document position; comparison means for comparing the document size determined by the determination means with a standard size; when the comparison result is in a predetermined state; An image forming apparatus comprising: determining means for determining a document size to be a standard size. (2) The image forming apparatus according to claim 1, wherein the size of the document determined to be a standard size by the determining means is represented by a standard size instead of an actual measurement value. (3) In claim 2, the method further comprises a selection means for selecting either a value detected as the size of the document determined to be a standard size by the determination means or a value of the standard size. An image forming apparatus characterized by: