JP3220222B2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, and more particularly, to an image forming apparatus provided with a sheet mounting table for replenishing sheets exposed outside the apparatus.

[0002]

2. Description of the Related Art An image forming apparatus such as a copying apparatus which is widely used generally has a paper storage section such as a cassette for storing paper inside the apparatus, and is supplied from the paper storage section. In this configuration, an image is formed on a fed sheet. Therefore, in the image forming apparatus, a predetermined amount of paper is stored in a paper storage unit in the apparatus, and is sent out to the image forming unit one by one as needed.

That is, the paper is a consumable that is consumed by image formation, and thus needs to be replenished periodically. Conventionally, the paper supply operation is generally performed manually. Further, since the amount of paper that can be stored in the image forming apparatus is constant, the replenishment frequency needs to be increased as the frequency of use of the image forming apparatus increases.

On the other hand, Japanese Patent Application Laid-Open No. Sho.
No. 97145, “Feeding device”, Japanese Utility Model Laid-Open No. 49-105
No. 431, "Cut sheet bundle for feeding",
No. 242336, “Sheet feeding device” and the like have been proposed.

Japanese Unexamined Patent Publication No. Sho 60-97145 discloses a "feeding device" in which a sheet wrapping material is formed in a box shape from a strong material such as cardboard or resin, and a feeding roller and a separating claw are provided. After the abutting portion is cut off by the box-shaped member, it is mounted at the sheet feeding position of the image forming apparatus main body. That is, by using the sheet packaging material as a cassette for feeding the sheet of the box-shaped member, the sheets can be easily handled while being stored in the packaging material, and the operability of the replenishment operation by hand is improved. It is intended.

[0006] Japanese Utility Model Laid-Open Publication No. 49-105431 discloses a "cut sheet bundle for feeding" in which a sheet bundle side end is fixed by a band, so that the sheet alignment operation at the time of sheet supply to a cassette is unnecessary. By doing so, the operability of the supply operation is improved.

Japanese Patent Laid-Open Publication No. Hei 1-2242336 discloses a "sheet feeding apparatus" in which first and second cassettes are placed on a transfer belt, and when the sheets in the first cassette are exhausted, the second cassette is conveyed. To the location and the first
The cassette is automatically discharged out of the apparatus.

[0008]

However, in a conventional image forming apparatus, when replenishing paper, it is basically necessary to load paper into a paper storage unit (for example, a cassette or the like) inside the apparatus by hand. Therefore, there were the following problems.

In the image forming apparatus, the position of the paper storage section in the apparatus body is inevitably determined because the paper needs to be efficiently sent from the paper storage section to the image forming section inside the apparatus. It is necessary to supply paper to a position where the paper storage unit is located. That is, in the case of the conventional cassette system, the paper replenishment operation involves removing the cassette (paper storage unit) from the apparatus main body, loading the paper in the cassette, and then mounting the paper in the apparatus main body again. There was a problem that it is.

In the case of the front loading method, which has become widespread in recent years, a sheet replenishing operation is performed by pulling out a tray (sheet storing portion) from the apparatus main body, stacking sheets in the tray, and storing the tray in the apparatus main body. The operation is as follows. This has the advantage that there is no need to have a heavy cassette as compared with the cassette system, but the tray that is the paper storage unit is often provided below the device due to the configuration of the front loading system, so There is a problem in that the paper must be refilled and the workability is poor.

In addition, since the paper storage unit needs to store the loaded paper for a long period of time and protect it from moisture absorption, falling objects, etc., for example, the cassette type requires a cover for the paper storage unit (cassette). In the front loading method, a paper storage unit (tray) is stored in the apparatus main body. Therefore, when replenishing paper, it is necessary to remove the cover or pull it out of the apparatus main body, so that the replenishing operation becomes more complicated and troublesome.

Further, in an image forming apparatus having a plurality of paper storage units, it is necessary to supply paper to a paper storage unit that has run out of paper. The user has to check on the display unit of the main body and search for the paper storage unit that needs replenishment, which has a problem that the operation is complicated.

On the other hand, according to Japanese Patent Application Laid-Open No. 60-97145, entitled "Feeding Apparatus", the operability of a manual replenishing operation is improved by using a sheet packaging material as a sheet feeding cassette. However, it is necessary to give the sheet wrapping material enough strength to be used as a cassette, which inevitably increases the cost compared to the case where only the original sheet is stored. In addition, there has been a problem that both the receiving portion of the apparatus main body becomes a dedicated product and lacks versatility.

Further, according to Japanese Utility Model Laid-Open Publication No. 49-105431, entitled "Sheet Cut Sheet Bundle", the operability of the replenishment operation can be improved by eliminating the need for the sheet alignment operation. Operations such as mounting, tray pull-out and storage, sheet stacking operation, and the like are necessary, and the complexity of sheet supply still remains.

According to Japanese Patent Application Laid-Open No. 1-242336, "sheet feeding apparatus", operability can be improved by automatically exchanging cassettes, but complicated operations for supplying paper to the exchange cassette are required. Was left.

Further, according to the conventional image forming apparatus, an image forming function for forming an image on a transfer sheet, an automatic document conveying function for automatically conveying a document, and a transfer sheet Although the functions directly related to the image forming process, such as the paper transport function for supplying paper and discharging it to a predetermined paper discharge section, are fulfilled, it is accepted that the labor involved in paper supply is inevitable. Therefore, the concept of automating paper supply to the paper storage unit is not applied, and there is a problem that a function for paper supply operation is not provided.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to improve workability in paper supply, simplify the supply operation, and facilitate paper supply.

Further, the present invention has been made in view of the above, and an object of the present invention is to provide a new function capable of easily and efficiently replenishing sheets.

[0019]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fixed paper storage section in which a storable paper size is fixed, and a variable size paper storage section in which a storable paper size can be changed. And a plurality of separating and feeding means for separating and feeding the sheets stored in the fixed sheet storing section and the variable size sheet storing section one by one, and image forming for forming an image on the sheet fed by the separating and feeding section Means, a sheet placing means disposed in a state exposed to the outside of the apparatus, and a sheet placed on the sheet placing means, which is selectively transferred to either a fixed sheet storing section or a variable size sheet storing section. Conveying means for conveying, paper size detecting means for detecting the size of the paper placed on the paper placing means, and stackable paper size for recognizing the stackable size of the fixed paper storage section and the size-variable paper storage section Recognition means Based on the paper size detected by the paper size detecting means and the stackable paper size recognizing means, the transport control of the transporting means is performed with the fixed paper storage section or the variable-size paper storage section having the same paper size as the transport destination, and the paper is fixed. The present invention provides an image forming apparatus provided with control means for controlling conveyance of a conveyance unit with a fixed paper storage unit as a conveyance destination when both paper sizes of the paper storage unit and the variable-size paper storage unit match. is there.

The above-mentioned control means performs feed control for selectively operating a plurality of separation feeding means in order to feed a sheet of a predetermined size. When the sheet is present in both the fixed sheet storage section and the variable size sheet storage section, it is desirable to perform feed control that gives priority to feeding from the variable size sheet storage section. Further, it is desirable that the size-variable paper storage unit is disposed farther away from the image forming unit in the conveyance path than the fixed paper storage unit.

Further, in addition to the above-described configuration, the apparatus further includes a fullness detecting means for detecting the fullness of the paper loaded in the fixed paper storage part and the variable-size paper storage part, and the control means controls the conveyance of the paper from the paper mounting means. When the fixed paper storage section or the variable-size paper storage section is full, the transport destination of the paper is changed to another fixed paper storage section or a variable-size paper storage section on which sheets can be loaded, and the transport control of the transport means is performed. It is desirable to carry out.

Further, in addition to the above-described configuration, there is provided paper presence / absence detecting means for detecting that there is no paper in the size-variable paper storage unit. If there is no fixed paper storage unit and variable size paper storage unit capable of storing the paper size placed on the mounting means, an indication as to whether or not to change the size of the variable size paper storage unit without paper is displayed. When a change in size is input via the input means, the paper size that can be stored in the variable-size paper storage section is changed, and the paper placed on the paper mounting section is transported to the variable-size paper storage section. Is desirable.

In order to achieve the above object, the present invention provides a plurality of paper storage units for storing paper and a plurality of separation feeding units for separating and feeding the paper stored in the paper storage unit one by one. Means, an image forming means for forming an image on the sheet fed by the separating / feeding means, a sheet placing means disposed in a state exposed to the outside of the apparatus, and a sheet placed on the sheet placing means. And a transport unit for selectively transporting the paper to one of the paper storage units, and controlling the transport of the transport unit to selectively transport the paper placed on the paper placement unit to a paper storage unit capable of storing the paper. Control means for transporting the paper to a plurality of paper storage sections capable of storing a predetermined number of sheets when there are a plurality of paper storage sections capable of storing the paper. To provide.

In order to achieve the above object, the present invention provides a plurality of paper storage units for storing paper and a plurality of separation and feeding units for separating and feeding the paper stored in the paper storage unit one by one. Means, an image forming means for forming an image on the sheet fed by the separating / feeding means, a sheet placing means disposed in a state exposed to the outside of the apparatus, and a sheet placed on the sheet placing means. Transport means for selectively transporting the paper to any one of the paper storage units, transport start instructing means for instructing the start of operation of the transport means, and transport control of the transport means to be placed on the paper placing means. Control means for selectively transporting the stored paper to a paper storage unit capable of storing the paper, and when there are a plurality of paper storage units capable of storing the paper, the control means transmits a plurality of papers for each transport start instruction. An image forming apparatus that sorts and transports paper to a paper storage unit that can store paper It is intended to provide.

[0025]

In the image forming apparatus according to the present invention, the control means controls the conveying means to convey the paper placed on the paper placing means to the paper storage.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the case where the image forming apparatus of the present invention is applied to a copying machine will be described in the order of [Embodiment 1], [Embodiment 2], [Embodiment 3].

[Embodiment 1] A schematic configuration of the copying apparatus according to the first embodiment will be described. A configuration of an automatic original / transfer paper transport apparatus. A configuration of a main control section. A configuration of a sheet cassette. A control operation of a main control section. The order of the feed control in the copy operation will be described in detail with reference to the drawings.

FIG. 1 is an external view of a copying apparatus (image forming apparatus) according to a first embodiment. An automatic original / transfer sheet transport apparatus 200 is mounted on the upper surface of the copying apparatus main body 100 in the upper projection plane. Is placed.
As shown in FIG.
The two paper mounting tables 201 and 202 are provided. An operation display unit 300 is provided on the front surface of the copying apparatus main body 100.

FIG. 2 shows the configuration of the copying apparatus main body 100 and the automatic document / transfer paper transport apparatus 200. The automatic original / transfer paper transport device 200 is provided on the platen glass 111 of the copying machine main body 100, and is provided with paper mounting tables 201 and 202 for mounting paper (original or transfer paper), and paper mounting tables 201 and 202. The sheet fed from the sheet feeder 202 is fed to the platen glass 111 side or a sheet feed cassette 131-
Switching units 203, 204, 205 for guiding to 134 side
And a transport belt 206 that transports the paper sent from the paper mounting tables 201 and 202 onto the platen glass 111.
And a discharge tray 2 for discharging the paper on which the exposure processing has been completed.
07.

The main body 100 of the copying apparatus is roughly composed of an optical system 110, an image forming system 120, a paper storage / feed system 130, and a supply / transport system 140.

An optical system 110 includes a platen glass 111 for placing a document and an exposure lamp 112 for illuminating the document.
And a V mirror 113, a lens 114, and a mirror 115 for guiding the reflected light to a photosensitive belt 121 described later.

The image forming system 120 includes a photosensitive belt 121,
A charger 122 for uniformly charging the surface of the photoreceptor belt 121; and a developing device 123 for developing the electrostatic latent image formed on the photoreceptor belt 121 with toner to make it a visible image
And a transfer charger 124 for transferring the toner image on the photoreceptor belt 121 obtained by the development to a transfer sheet.
A separation charger 125 for separating the transfer paper after the transfer from the photosensitive belt 121; a cleaning device 126 for removing toner remaining on the surface of the photosensitive belt 121 after the transfer paper is separated; A fixing device 127 for fixing the toner image.

The paper storage / feed system 130 includes four paper cassettes 131, 132, 133, and 13 for storing transfer paper.
4 and a transport path for guiding the transfer paper fed from the paper feed cassettes 131 to 134 to the image forming system 120.
In the sheet cassettes 131 to 134, the upper two sheet cassettes 131 and 132 are fixed sheet size sheet cassettes, and the lower two sheet cassettes 133 and 134 are sheet size variable sheet cassettes. The upper two rows are frequently used, such as A4 size and letter size, to minimize the first copy time (time from when the print start key is turned on to when the transfer paper is ejected from the copying apparatus main body 100), or to set the paper capacity of the cassette. Can be increased to correspond to a high use frequency.

Paper feed cassettes 131, 1 having a fixed paper size
Reference numeral 32 denotes a configuration in which the size of the paper to be stored is determined, so that when the paper sent from the supply / transport system 140 described later is stored as it is, the paper is stacked in a cassette in a state of being aligned. On the other hand, a paper cassette 1 with a variable paper size
33 and 134, the size of the paper to be stored is variable, and in order to stack the paper in the cassette, it is necessary to change the conveyance end timing of the rear end of the paper according to the paper size. For this reason, in the first embodiment, the sheet feeding cassette 133,
And a plurality of transport rollers 136 for transporting the paper into 134, and switching units 137a, 137b, 137c, and 137a for adjusting the transport end timing of the rear end of the paper according to the paper size.
137d is provided. Reference numeral 135 denotes a shift roller for aligning the paper supplied in the paper feed cassettes 131 to 134 to the leading end of the cassette and aligning the papers. Reference numeral 138 denotes a roll of paper loaded in the paper feed cassettes 131 to 134. This is a separation feeding device that separates and feeds each sheet.

The replenishment transport system 140 converts the paper sent from the automatic original / transfer paper transport device 200 to the image forming system 120,
Alternatively, the switching unit 14 is a transport path for transporting the paper to the paper storing / feeding system 130 and guiding the paper to the image forming system 120.
1 and a paper feed cassette 1 of a paper storage / feed system 130
Switching unit 14 for leading to 31, 132, 133, 134
2,143,144. In addition, replenishment transfer system 1
Since the linear speed (paper transport speed) of 40 can be higher than the linear speed of transporting the paper to the image forming system 120 during the image forming operation, the linear speed of supplying paper to the paper feed cassettes 131 to 134 can be made higher. A variable speed motor (for example, a stepping motor) as a motor for driving a roller or a roller on the transport path between the mounting tables 201 and 202 and the switching unit 141
You are using

Further, the automatic original / transfer paper transport device 200,
Further, sensors S1 to S12 are arranged in the copying apparatus main body 100 as shown in the figure.

Here, the sensor S1 is connected to the sheet table 20.
Paper (original or transfer paper) placed on 1202
Is a size detection sensor for detecting the size of a photo sensor, and is composed of a combination of a plurality of photo sensors.

The sensor S2 is connected to the paper table 201, 202
Is a timing sensor that detects the leading edge of the paper fed from the printer and measures the timing of feeding.

The sensor S3 is a paper discharge sensor for detecting that the document subjected to the exposure processing has been discharged to the paper discharge tray 207.

The sensor S4 is connected to the paper table 201, 202
This is a conveyance sensor that detects that the paper fed from is supplied to the replenishment conveyance system 140.

The sensor S5 is a transport sensor that is disposed on a common transport path of the image forming system 120 and the paper storage / feed system 130 in the transport path of the replenishment transport system 140, and detects the presence or absence of paper transport.

The sensor S6 is a transport sensor for detecting that the paper has been transported to the paper storage / feed system 130 in the transport path of the supply transport system 140.

The sensor S7 is a transport sensor disposed immediately after the switching unit 142 and immediately before the sheet feeding cassette 131, and the sensor S8 is a transport sensor and sensor disposed immediately after the switching unit 143 and immediately before the sheet feeding cassette 132. S9 is the switching unit 14
The transport sensor and the sensor S10 disposed immediately after the sheet feed cassette 133 and immediately before the sheet feed cassette 133 are the transport sensors disposed immediately before the sheet feed cassette 134. That is, the sensors S7 to S10
Are transport sensors for detecting that the paper has been transported to the paper feed cassettes 131 to 134, respectively.

The sensors S11 are respectively provided in the sheet cassette 1
This is a loading amount detection sensor that detects, by height, that the sheets loaded in 31 to 134 are full, and detects at a height that is more than the limit height at which loading is possible.

The sensor S12 is a discharge sensor that detects the discharge of a sheet disposed downstream of the fixing device 127.

FIG. 3 shows the structure of the operation display unit 300.
Numeric keypad 301 for setting the number of copies, clear /
A stop key 302, a start key 303 for copy start, a mode clear key 304 for initializing various modes, an enter key 305 pressed for recognition when inputting a numerical value in the special mode, and setting and release of an interrupt mode. Key 307 for selecting various other modes (for example, paper selection, scaling, image density, etc.), and a liquid crystal display unit 308 for displaying various messages. . still,
The liquid crystal display unit 308 has a fixed pattern unit 308a for displaying a mode state such as the number of copies, and a character (dot) display unit 308b capable of displaying characters.

In the fixed pattern section 308a, as shown in the drawing, each paper cassette disposed in the copying apparatus main body 100 is a paper cassette having a fixed paper size or a paper cassette having a variable paper size. Cassette indications 309a to 309d indicating whether the cassette is a cassette are provided. The cassette indicators 309a to 309d also serve as push buttons. For example, when the cassette indicator 309a is pressed, the sheet cassette 131 is used as a transport destination when replenishing the sheets placed on the sheet trays 201 and 202. (First
(The paper cassette on the lower stage) can be designated.

Further, by displaying a combination of the paper size display 310 for displaying the paper size and the cassette displays 309a to 309d, the paper size of the selected paper feed cassette can be indicated. Similarly, by displaying the combination of the LED lighting of the character "in replenishment" and the cassette indications 309a to 309d, it is possible to indicate the paper feed cassette in the replenishment operation.

Next, the configuration of the automatic document / transfer paper transport device 200 will be described in more detail with reference to FIGS.

FIG. 4 shows an automatic original / transfer paper transport device 200.
2 is a perspective view of the device from the right front. The automatic original / transfer paper transport device 200 includes the above-described paper mounting tables 201 and 202,
A separation sheet feeding unit 210 that separates and feeds the sheets placed on the sheet mounting tables 201 and 202 one by one, and a function selection unit 220 for selecting a function of the automatic original / transfer sheet conveyance device 200
And a transfer / reversal unit 230 in which the above-described transfer belt 206 is stored.

Here, the transfer / reversing section 230 is required to be used as a pressure plate when copying a thick thing such as a book, so that it is configured to rotate about the hinge AA (see FIG. 2). . The pivotal movement about the hinge AA is because the paper placing tables 201 and 202 are located above the transport / reversal unit 230, and the paper placing tables 201 and 202 are rotated.
To the maximum position that does not interfere with 231 is
This is a handle used when the transport / reversal unit 230 is rotated as a pressure plate.

Further, the separation sheet feeding section 210 and the sheet table 2
01 and 202 rotate around the hinge BB. As shown in FIG. 2, the rotation angle is about 45 ° to the upper left, and the leading ends of the sheet mounting tables 201 and 202 are positioned at
0 It is configured so as not to fall to the left from the extension of the left end. This is to save space at the time of rotation and to prevent damage to an adjacent object or the paper mounting table itself due to excessive rotation. The rotation of the separation paper supply unit 210 and the paper mounting tables 201 and 202 enables a paper jam occurring at a connection part with the copying apparatus main body 100 and maintenance of the connection part.
Although not shown, the separation sheet feeding section 210 and the transport / reversing section 230 are provided with an opening detection sensor using a transmission type photo sensor, and each open state is recognized independently.

FIG. 5 shows the configuration of the sheet mounting tables 201 and 202 and the separation sheet feeding section 210. Paper loading tables 201, 20
2 includes rear end regulating plates 201a and 202 that regulate the rear end of the placed paper and push the paper forward (in the paper feeding direction).
a is provided. These rear end regulating plates 201a, 202
When the start key 303 of the operation display unit 300 is pressed after the sheet is placed, the position a automatically moves to regulate the rear end of the sheet.

The separation sheet feeding unit 210 is provided in addition to the switching units 203, 204, and 205 for guiding the sheet sent from the sheet mounting tables 201 and 202 to the platen glass 111 side or the replenishment conveyance system 140 side. , Paper table 20
A pickup roller 211 that rotates while being pressed against the uppermost sheet of the first and second sheets 202 at a predetermined pressure, a feed roller 212 that feeds out the sheet moved by the pickup roller 211, and a reverse roller 213 for preventing double feed. Have. A motor that drives these rollers uses a variable speed motor (for example, a stepping motor).

As shown in FIG. 6, the size detection sensor S1 for detecting the size of the paper (document or transfer paper) mounted on the paper mounting tables 201 and 202 is composed of a combination of a plurality of photosensors. If all of the plurality of photosensors do not detect the paper, the paper mounting tables 201 and 20
It is also used as a sheet detection sensor for detecting the presence or absence of a sheet by determining that a sheet is not placed on the sheet 2.

FIG. 7A shows a function selection unit 220 for selecting a function of the automatic original / transfer paper transport device 200. The automatic original / transfer paper transport device 200 of the first embodiment
(1) a replenishment function for transporting the paper (in this case, transfer paper) placed on the paper mounting tables 201 and 202 to the paper feed cassettes 131 to 134; Paper (in this case, transfer paper)
(3) Paper loading tables 201 and 20
And an ADF function (automatic document transport function) for transporting the paper (document in this case) placed on the platen glass 111 onto the platen glass 111.
Are a replenishment key 221a for selecting a replenishment function for the upper (201) and lower (202) paper loading tables, a manual feed key 222a for selecting a manual feed function, and
LEDs 221b, 222b for displaying the selected function,
223b, and the ADF function, which is used most frequently, is automatically selected when a sheet is placed on the sheet placing tables 201, 202 as an initial value. Therefore,
When using a function other than the ADF function, a desired selection key is pressed. In addition, no function selection canceling means is provided, and the selected function is canceled by removing the placed paper.

According to the configuration shown in FIG. 7A, when the paper is placed, the use of the ADF is preferentially selected, so that the operability of the ADF which is usually most used can be prevented from lowering. Further, it is possible to prevent a situation in which a document is erroneously sent to the image forming system 120 or the sheet feeding cassettes 131 to 134.

In the first embodiment, the function selecting section 220 is configured as shown in FIG. 7A. For example, as shown in FIG. May be selected so that the automatic document / transfer paper transport device 200 does not operate unless one of them is selected. In this case, the function selection unit 220 includes a replenishment key 221a for selecting a replenishment function for the upper (201) and lower (202) paper trays, a manual feed key 222a for selecting the manual feed function, and an ADF function. And an LED 221b, 222b, 223b for displaying the selected function. The replenishment stop key 224 is used to stop replenishment regardless of other operations when replenishment is being performed, and to clear / display the operation display unit 300 when replenishment is not being performed.
It works in the same way as the stop key 302. It is also used to release the reserved state of each function.

If the key of each function is not selected as described above, the operation is disabled, so that the probability that the sheet is conveyed along a path not intended by the operator can be reduced.

FIG. 8 shows the configuration of the main control unit. The main control unit
A CPU 401a for controlling the operation of the whole copying apparatus, and a ROM 401b for storing a control program and control data
, A data storage RAM 401c, a clock IC 401d for outputting current time data, and an interface 401 to which various cross-current loads such as a motor and a clutch are connected.
e, 401f, an optical control board 401g for controlling the optical system 110 shown in FIG. 2, and a serial communication decoder 401h for communicating with each control unit (ie, another slave CPU) such as the operation display unit 300. , An analog interface 401i to which various analog sensors are connected, and a digital interface 40 to which various digital sensors are connected.
1j, a solid state relay interposed in the supply line of the light load voltage VL from the power supply unit in response to the instruction of the CPU 401a obtained via the serial communication decoder 401h, and the supply line of the heavy load voltage VH ON independently of the solid state relays
/ OFF relay driver 401k. The power supply of this apparatus is a commercial power supply, and is used for a logic load such as a CPU 401a or various sensors from a power supply generated by a power supply unit (the main DC power supply 404, the image forming motor control unit 402, the supply motor control unit 403, etc.). Voltage Vcc and light load voltage VL for operating ICs and the like
And a heavy load voltage VH for operating a motor, a clutch, a heater, and the like. However, a backup power supply 401l is connected to the RAM 401c and the clock IC 401d in case the commercial power supply is cut off.

Next, with reference to FIGS. 9 to 13, the paper feed cassettes 131 to 131 will be described.
The configuration of 134 will be described. In the first embodiment, as described above, the paper feed cassettes 131 and 13 having a fixed paper size are used.
2, paper cassettes 133 and 134 of variable paper size
It has two paper cassettes.

The common configuration of the paper feed cassettes 131 to 134 will be described using the paper feed cassette 131 having a fixed paper size as an example. As shown in FIG.
There are a bottom plate 171 for giving appropriate separation / feeding conditions to the separation / feeding device 138 by vertical movement, and a side fence for regulating the size of the sheet in the horizontal direction. 172a) 1
72, a light emitting element 173 and a light receiving element 174 disposed at the tip of the side fence 172, and a code plate 17 for detecting a sheet size that can be loaded in the sheet cassette.
5 is provided.

The bottom plate 171 is provided with a notch 171a for detecting the paper end. Also,
The light-emitting element 173 and the light-receiving element 174 constitute a stacking amount detection sensor S11 shown in FIG. 2 by a combination of both, and it is determined that the sheets stacked in the sheet cassette have become full. Detect at a height that is more than the height. The code plate 175 is fitted with a five-push switch 176 provided on the copying apparatus main body 100 side and presses a predetermined switch to notify the copying apparatus main body 100 of the paper size that can be loaded in the sheet cassette. It is a configuration to do.

FIGS. 10A, 10B, and 10C show the configuration of a paper end detecting mechanism for detecting that the paper placed in the paper cassette has run out. In the figure, 177 is a paper end filler for detecting paper end, 178 is a paper end filler shaft,
179 denotes a paper end release lever, and S21 denotes a paper end detection sensor. When paper is present in the paper feed cassette 131, the paper pushes the paper end filler 177 as shown in FIG.
1 is out of the shield. When the paper runs out, the paper end filler 177 falls into the notch 171a as shown in FIG.
1 and the paper end is detected.

When the paper feed cassette 131 is pulled out for the purpose of jam clearance or the like, the paper end filler 177 may hit the paper feed cassette 131 and be damaged. The release lever 179 is forcibly pushed to raise the paper end filler 177.

FIG. 11 shows a jogger mechanism mounted in paper cassettes 133 and 134 of variable paper sizes. The jogger fences 172a of the paper cassettes 133 and 134 with variable paper sizes are configured to change positions via a drive wire 169 by a jagger motor (stepping motor) M22, and a paper end detection mechanism (see FIG. 10).
When the paper end is detected, the robot moves to the home position.

When the paper is placed on the paper mounting tables 201 and 202 and the paper cassettes 133 and 134 of variable paper size are selected as the paper transport destinations, the paper cassettes according to the paper size data detected by the paper size detection sensor S1 are selected. To a predetermined position (a position slightly outside the sheet size) to prepare for the entry of the sheet. The sheet passes through the last conveyance sensor S9 or S10 in the conveyance path, and after a predetermined time (time determined by the sheet size), the jogger fence 172a moves to the sheet size and performs sheet alignment. This operation is executed every time a sheet enters.

FIG. 12 shows the paper entry gates of the paper cassettes 133 and 134 of variable paper sizes, for adjusting a plurality of transport rollers 136 for transporting the paper and the transport end timing of the rear end of the paper according to the paper size. Switching unit 13
7a, 137b, 137c, and 137d form sheet entrance gates GATE1 to GATE5, and sheets sent through the supply / conveyance system 140 are cassettes by the conveyance rollers 136 and the switching units 137a, 137b, 137c, and 137d. It is discharged to the paper stacking section on the bottom. The paper entry gates GATE1 to GATE5 are selected depending on the paper size. Switching units 137a, 137b, 137c, 137
The opening and closing of d is performed by the solenoid 180, respectively.
For example, when the solenoid 180 is turned on and the switching unit 137b is opened, as shown in FIG.
From the position b (that is, GATE2), the sheet is taken into the sheet stacking section on the bottom of the cassette. When the solenoid is turned off, the return spring 181 closes the GATE 2 by the switching unit 137b, and the sheet passes over the switching unit 137b.

Control Operation of Main Control Unit FIGS. 14 to 17 are main control flowcharts showing the control operation of the main control unit according to the first embodiment. Prior to the description of the main control flowchart, Table 1 shows flags (flags) 1 to 10 used in the first embodiment.

[0070]

[Table 1]

Main switch SW of copying apparatus main body 100
When 1 is turned on, the main control unit executes the following steps. First, it is determined whether or not the sensor S1 of the sheet mounting table 201 (hereinafter, referred to as an upper stage) is ON (S10).
1) If not ON, f relating to the upper mounting table
Flags 1, 3, 5, and 7 are set to 0 (S102).

When the sensor S1 is ON and flag2 =
If 1 (S101, S103), since the lower mounting table is operating, if the upper supply key is turned on, f
The flag 7 is set to 1 to make an upper replenishment reservation. If the upper replenishment key is not ON and the flag 7 is not 1, the process proceeds to S114 (S104, S105, S10).
6).

When the sensor S1 is ON and flag2 =
If the upper replenishment key is ON instead of 1 (S101, S1
03, S107), it is determined based on the sheet size detected by the sensor S1 whether there is a sheet cassette that can be stored in the sheet cassettes 131 to 134 (S108). The mounting table replenishing operation is executed to replenish the sheets on the upper mounting table to the corresponding paper feed cassette, 1 is set to flag1, and 0 is set to flag7 (S109, S110). On the other hand, if there is no paper cassette that can be stored, a cassette absence display such as "there is no corresponding cassette" is performed (S111).

If the upper replenishment key is not ON in S107 and there is an upper replenishment reservation (flag7 = 1) (S112), the flow advances to S109 to execute the upper stage replenishment operation. Also, the upper replenishment key is not ON and fl
If ag7 is not 1 and flag1 = 1 (during replenishment of the upper stage), the process proceeds to S124 (S112, S11).
3).

If flag1 is not 1 in S113,
It is determined whether or not flag4 = 1 (during the manual operation of the lower mounting table) (S114).

If the upper stage manual insertion key is ON during the lower stage insertion stage manual insertion operation, the upper stage insertion stage manual insertion reservation is performed (flat
g9 ← 1) The process proceeds to S124 (S114, S115, S1)
16). Upper manual feed key is not ON, flag9 = 1
In the case of, the process proceeds to S124, and if the upper manual feed key is not ON and flag9 is not 1, the process proceeds to S123 (S123).
114, S115, S117).

If the upper stage manual insertion key is ON or flag 9 = 1 while the lower stage manual insertion operation is not being performed, the upper stage manual insertion operation is set (flag3 ← 1), and the upper stage manual insertion reservation is canceled (flag9 ← 0). ) And proceeds to S124 (S114, S118, S119, S120).

If the lower mounting table manual feed operation is not being performed, the upper manual feeding key is not ON, and the upper mounting table manual feed reservation is not being performed, and both flag3 and flag6 are not 1, the flow proceeds to S123. Otherwise, the flow proceeds to S124. Go on (S1
21, S122).

In S123, it is determined that the upper stage ADF is in operation by the processing of S103 to S122, flag5 is set to 1, and the process proceeds to S124.

In S124, it is determined whether or not the sensor S1 of the lower mounting table is ON. If it is not ON, flags 2, 4, 6, and 8 related to the lower mounting table are set to 0 (S125).

When the sensor S1 is ON and flag1 =
If 1 (S124, S126), since the upper mounting table is operating, if the lower supply key is ON, f
The flag 8 is set to 1 to make a lower supply reservation. If the lower supply key is not ON and the flag 8 is not 1, the process proceeds to S137 (S127, S128, S12).
9).

When the sensor S1 is ON and flag1 =
If the lower replenishment key is ON instead of 1 (S124, S1
26, S130), based on the sheet size detected by the sensor S1, it is determined whether there is a sheet cassette that can be stored in the sheet cassettes 131 to 134 (S131). The mounting table replenishing operation is executed to replenish the sheets on the lower mounting table to the corresponding paper feed cassette, 1 is set to flag2, and 0 is set to flag8 (S132, S133). On the other hand, if there is no paper cassette that can be stored, a cassette absence display such as "there is no corresponding cassette" is performed (S134).

If the lower replenishment key is not ON in S130 and there is a lower replenishment reservation (flag8 = 1) (S135), the flow advances to S132 to execute the lower mounting table replenishment operation. Also, if the lower replenishment key is not ON and fl
If ag8 is not 1 and flag2 = 1 (during lower stage mounting table supply operation), the process proceeds to S147 (S135, S13)
6).

If flag2 is not 1 in S136,
It is determined whether or not flag3 = 1 (during the manual operation of the upper mounting table) (S137).

If the lower stage manual insertion key is ON during the upper stage insertion stage manual insertion operation, the upper stage insertion stage manual insertion reservation is performed (flat
g10 ← 1) The process proceeds to S147 (S137, S138, S
139). The lower manual feed key is not ON and flag10
If = 1, proceed to S147 and turn on the lower manual feed key
If not flag10 = 1, the process proceeds to S146 (S137, S138, S140).

If the lower stage manual insertion key is ON or flag 10 = 1 while the upper stage manual insertion operation is not being performed, the lower stage manual insertion operation is set (flag4 ← 1), and the lower stage manual insertion reservation is released (flag10 ← 0). ) And S147
(S141, S142, S143).

If the upper-mounting-table-manual insertion operation is not being performed, the lower-manual-feeding key is not ON, and the lower-mounting-table-manual insertion is not being reserved, and both flag4 and flag5 are not 1, the flow proceeds to S146. Go on (S1
44, S145).

In S146, it is determined that the lower stage ADF is being operated by the processing from S126 to S145, 1 is set to flag6, and the flow advances to S147.

In S147, if the copy start key is turned on, the process proceeds to the next S148, and if not, the process returns to S101.

When the copy start key is turned on, first, during the operation of the upper stage ADF or the lower stage A
It is determined whether the DF operation is in progress (flag5 = 1 or flag6 = 1), and if any of them is operating, S171 (FIG. 17)
Reference) (S148).

Next, during the manual operation of the upper stage or the manual operation of the lower stage (flag3 = 1 or flag4)
= 1), and if none of them is in the manual feeding operation, it is determined whether or not there is an appropriate size on the mounting table. If there is no appropriate size, whether or not there is an appropriate size in the sheet feeding cassettes 131 to 134 It is determined whether or not it is (S150, S151). Here, if there is an appropriate size in the paper cassettes 131 to 134, paper is fed from the corresponding paper cassette and the copy operation is executed. If there is no next copy, the copy operation is stopped and the process returns to S101 ( S152 to S155). On the other hand, if there is no appropriate size in the paper cassettes 131 to 134,
A paper supply display such as "Please supply paper" is performed (S1
56).

If it is determined in S150 that the mounting table has an appropriate size, the operation of the upper or lower mounting table during the replenishment operation is stopped, and a supply reservation state is set (S157 to S162).

Subsequently, if the lower mounting table is being manually fed,
A manual feed operation is performed from the lower mounting table (S163, S1
64). If the lower stage is not in the manual insertion operation but the upper stage is in the manual insertion operation, the manual operation is executed from the upper stage (S165, S167). If the lower stage is not in the manual insertion operation and the upper stage is not in the manual insertion operation, a stage having an appropriate size is selected and the manual operation is executed (S166).

When the paper is supplied by the manual feed operation, the copy operation is executed. If there is no next copy, the copy operation is stopped, and the process returns to S101 (S168 to S17).
0).

In S171, it is determined whether the upper stage ADF is operating. If the operation is being performed, and the lower stage is not being replenished, but the lower stage is being manually inserted, the lower stage is manually inserted, the upper ADF operation is executed, and the copy operation is executed (S172, S175, S175). S178, S1
79, S180). At this time, if the lower stage is being replenished, the lower stage is replenished and the flag 8 is set to 1
Is set, and flag2 is set to 0 (S173, S1
74).

If the lower stage is not in the manual insertion operation and the lower stage has an appropriate size, the lower manual insertion operation is executed, the upper ADF operation is executed, and the copy operation is executed (S175 to S180). If there is no proper size in the lower stage, it is determined whether or not there is a proper size in the sheet cassettes 131 to 134. If there is a proper size, the sheet feeding operation of the corresponding sheet cassette is executed to execute the copy operation. Are executed (S181 to S183). At this time, if there is no appropriate size, a paper supply display such as "Please supply paper" is displayed (S184), and the process returns to S101.

On the other hand, if the upper stage ADF is not in operation and the upper stage is in manual feed operation, the upper stage manual feed operation is executed, the lower stage ADF operation is executed, and the copy operation is executed (S171, S185 to S188). . At this time,
If the upper stage has an appropriate size and the upper stage is being replenished, the replenishment of the upper stage is stopped, 1 is set to flag7, and 0 is set to flag1 (S189 to S189).
192). If there is no appropriate size on the upper stage,
Steps 181 to S184 are executed.

After execution of the copy operation (S180, S183,
If there is no next copy (S188), the copy operation is stopped and the process returns to S101 (S193, S194).

As described above, the main control section executes the control operation according to the main control flowchart. Therefore, when the operator places the sheet on the upper stage (or the lower stage) and selects the replenishment function via the function selection unit 220, the sheet placed on the upper stage is separated from the separation sheet feeding unit 210 and The sheet is stored in a sheet cassette by a sheet storing and feeding system 130. In other words, paper supply is automatically performed.

Transport control in replenishment operation For example, a sheet is placed on the upper stage
When the replenishment key 221a is pressed, the LED 221b is turned on to indicate that the replenishment function has been selected (see FIG. 7). Subsequently, the start key 303 of the operation display unit 300
When the user presses (see FIG. 3), the sheet placed on the upper stage is conveyed to the sheet cassette by the separation sheet supply unit 210 and the sheet storage / feed system 130. However, the paper cassette to be supplied at this time is automatically selected by the copying apparatus main body 100.

On the other hand, after pressing the supply key 221a and pressing one of the cassette indications 309a to 309d of the operation display unit 300 to select a sheet supply destination, the sheets placed on the upper stage are separated. The sheet is conveyed to the selected sheet cassette by the sheet feeding unit 210 and the sheet storing / feeding system 130.

Specifically, the paper is placed on the upper mounting table,
When the user presses the supply key 221a of the function selection unit 220 and then presses the start key 303 (or presses one of the cassette displays 309a to 309d and then presses the start key 303), the main control unit The main control flowchart is executed, and S101, S103, S10
After S7 and S108, the upper stage mounting table supply operation (subroutine) of S109 is executed. Here, the case where the paper is placed on the upper mounting table is taken as an example, but the same applies to the case where the paper is mounted on the lower mounting table. In this case,
A lower stage mounting table supply operation (subroutine) of S132 is executed.

FIGS. 18 to 20 show flowcharts of the upper stage mounting table supply operation in S109. First, it is determined whether or not a supply destination cassette is specified (S201). If so, the process proceeds to S224 to execute a supply operation with the specified cassette as a supply destination. If it is not specified, it is necessary to select a supply destination cassette on the copying apparatus main body 100 side, and the process proceeds to S202 to S223 to automatically select a supply destination cassette.

In S202 to S223, first, it is determined whether or not there is a sheet on the mounting table (S202). If there is no sheet, the display 1 processing indicates that "there is no transfer sheet on the mounting table".
A message such as "Please check the mounting table" is displayed (S203).

If there is paper on the mounting table, first, it is determined whether the size of the paper in the first-stage paper cassette (paper cassette 131) and the size of the paper on the mounting table are the same size ( S204). Specifically, as shown in FIG.
Compare the stackable paper size detected by the code plate 175 of the paper cassette with the five-push switch 176 on the copying apparatus main body 100 side and the paper size on the paper mounting table detected by the size detection sensor S1. I do.

If the paper sizes are the same, it is determined whether or not the first-stage paper feed cassette is full based on the output of the load amount detection sensor S11 (S20).
5) If not full, the first-stage paper cassette is displayed as a supply destination (S206), and the first-stage supply operation is started (S207). This replenishment operation is performed until the first-stage paper feed cassette is full or the paper on the mounting table runs out (S205, S208).

If it is determined in step S204 that the size of the paper in the first-stage paper cassette and the size of the paper in the mounting table are not the same size, similarly, the second-stage paper cassette (paper-cassette 132) is set in the second-stage paper cassette. On the other hand, the same processing as in S204 to S208 is performed.

If it is determined that the size of the paper in the second-stage paper cassette and the size of the paper in the mounting table are not the same size, the same is applied to the third-stage paper cassette (the paper cassette 133). On the other hand, the same processing as in S204 to S208 is performed.

If it is determined that the size of the paper in the third-stage paper cassette and the size of the paper in the mounting table are not the same size, similarly, the fourth-stage paper cassette (paper-feed cassette 134) is set. On the other hand, the processing of S209 to S213 (S2
04 to S208).

Therefore, the processing up to this point (S201 to S2)
13) In the first, second, third, and fourth stages, it is determined whether the size of the paper in the paper cassette and the size of the paper in the mounting table are the same. The replenishment operation is executed with the paper cassette as the replenishment destination. In other words, the supply destination is selected according to the priority order of the first stage, the second stage, the third stage, and the fourth stage. For example, a plurality of paper feed cassettes having the same size as the paper size of the mounting table are selected. When there are a plurality of sheet cassettes that exist and the stacking amount is less than the predetermined amount, the first-stage and second-stage fixed-size sheet cassettes are preferentially selected.

If there are a plurality of replenishable paper feed cassettes, the replenishment destination is selected in accordance with the priority described above, and when one paper feed cassette becomes full, the next replenishable paper feed cassette is automatically set. The cassette is selected as a replenishing destination, and replenishment is continued until there is no more paper on the mounting table.

Next, if it is determined in S209 that the size of the paper in the fourth paper cassette is not the same as the size of the paper in the mounting table, or if the fourth paper cassette is full in S210. If it is determined, the variable-size paper cassette (that is, the paper cassettes 133, 13)
It is determined whether or not 4) is the paper end (S)
214). Here, if the paper end is not reached, there is no suitable supply destination, so the paper size display 310 and the cassette display 30 for displaying the paper size without displaying the cassette size.
Turn off the display of 9a to 309d, and display 2 processing "No suitable supply destination", "This paper cannot be supplied"
Is displayed (S215, S216).

On the other hand, if a paper-end variable-size paper feed cassette exists in S214, the message "Change the cassette size. 1: Yes 2: No]
The operator inputs whether or not to change the cassette size of the variable-size paper cassette that has reached the paper end (S217). Specifically, the operator inputs 1 (Yes) or 2 (No) using the numeric keypad 301 according to the above display. If the cassette size is not changed, the process proceeds to the display 2 process in S216.

When the cassette size can be changed,
The corresponding size-variable paper cassette is displayed as a supply destination, the cassette size is changed, and the changed cassette size is displayed (S218, S219, S220). Specifically, the cassette indications 309a to 309d (see FIG. 3) of the corresponding variable-size sheet cassette are turned on as the supply destinations, and then, based on the sheet size of the mounting table, the jogger fence 172a (see FIG. 11). Is changed, and the paper size display 310 of the corresponding paper size is turned on.

Subsequently, a replenishment operation of the n-th paper cassette is executed (S221). This replenishment operation is performed until the n-th paper cassette becomes full or the paper on the mounting table runs out (S222, S223).

Therefore, the processing up to this point (S214 to S2)
23) In the case where there is no paper in the variable-size paper cassette and there is no paper cassette having the same paper size as the paper size placed on the paper table, the variable-size paper cassette is instructed by the operator. The size of the paper that can be stored is changed, and the paper placed on the paper mounting table is transported to the variable-size paper cassette.

On the other hand, if the supply destination cassette is designated in S201, it is determined whether or not there is paper on the mounting table (S224). Is not available "and" Please check the mounting table "are displayed (S225). If there is a sheet on the mounting table, a replenishing operation is executed with the designated cassette as a replenishing destination (S226). This replenishment operation is performed until there is no more paper on the mounting table (S2).
27).

Feed Control in Copy Operation In the first embodiment, when a copy operation is executed, sheets are fed from the sheet feed cassettes 131 to 134 as feed sources for feeding sheets to the image forming system 120. There are two cases in which the paper mounting tables 201 and 202 feed paper using the manual feed function. When feeding from the paper feed cassettes 131 to 134, there are a case where the paper feed cassette of the feed source is designated on the operation display unit 300 and a case where the copying apparatus main body 100 automatically selects the paper feed cassette. is there. Here, a description will be given of a feed control when sheets are fed from the sheet cassettes 131 to 134.

FIG. 21 is a flowchart of the sheet cassette operation (subroutine of S152 and S182) shown in the main control flowchart. First, it is determined whether or not the cassette of the feeding source has been designated (S301). If so, it is determined whether or not there is a sheet in the designated n-th paper cassette (S302). If there is paper, n
The feeding operation is executed with the sheet cassette of the tier being the feeding source (S303). If there is no paper, a message such as "There is no suitable paper: replenish paper" is displayed in the display 3 process (S304).

On the other hand, if it is not specified, it is necessary to select the feed source cassette on the copying apparatus main body 100 side.
Go to S313.

In S305 to S313, first, it is determined whether the size of the paper in the third-stage paper cassette (the paper cassette 131) is the same as the size of the paper in the mounting table (S305). Here, if the paper sizes are the same, it is determined whether there is paper in the third-stage paper feed cassette based on the output of the paper end detection sensor S21 (S306). The feed cassette of the tier is displayed as the feed source (S307), and the feed operation of the third tier is started (S308).

In S305, it is determined that the paper size of the third-stage paper cassette is not the same as the paper size of the mounting table, and in S306, it is determined that there is no paper in the third-stage paper cassette. In this case, similarly, in steps S <b> 305 to S
The same processing as 308 is performed.

Also, when it is determined that the size of the paper in the fourth-stage paper cassette and the size of the paper in the mounting table are not the same size, and when it is determined that there is no paper in the fourth-stage paper cassette. Performs the same processing as in steps S305 to S308 on the first-stage paper feed cassette (paper feed cassette 133).

Further, when it is determined that the paper size of the first-stage paper cassette and the paper size of the mounting table are not the same size, and when it is determined that there is no paper in the first-stage paper cassette. Executes the processing of S309 to S312 (the same processing as S305 to S308) on the second-stage paper cassette (paper cassette 134).

If all the paper cassettes do not match the paper size, or if there is no paper in the relevant paper cassette, a message such as "There is no suitable paper: replenish paper" in display 3 processing. Is displayed (S31
3).

Therefore, in the above flowchart,
In the order of the third, fourth, first, and second stages, it is determined whether the paper size of the paper cassette and the paper size of the mounting table are the same. The feeding operation is performed as a feeding source. In other words, the third stage,
The feed source is selected according to the priority order of the fourth, first, and second tiers. For example, if there are a plurality of paper feed cassettes having the same size as the paper on the mounting table, Stage,
The fourth-stage variable-size paper cassette is preferentially selected.

As described above, in the first embodiment, paper can be replenished only by placing replenishment paper on the paper mounting table provided to be exposed to the outside of the copying apparatus main body. And the trouble of pulling out the tray can be saved. Further, since the paper placed on the paper mounting table is immediately conveyed to the paper feed cassette, the paper mounting table can be simply configured without requiring long-term protection of the paper and measures against moisture absorption.

Further, since the paper is supplied preferentially to the fixed-size paper supply cassette, the probability that the variable-size paper supply cassette is empty increases. Even when paper is replenished, paper can be replenished by changing the paper size of the variable-size paper feed cassette.

When the paper is fed from the paper feed cassette, the paper is preferentially fed from the variable size paper feed cassette. The opportunity to effectively use the paper feed cassette can be increased.

Further, as shown in FIG.
In contrast, since the variable-size paper cassette is located farther from the fixed-size paper cassette, the transport path from the normally used fixed-size paper cassette to the image forming system 120 is shortened, and overall productivity is reduced. Is improved.

[Second Embodiment] The copying apparatus of the second embodiment differs from the first embodiment only in the flow chart of the transport control in the replenishing operation, and the other configurations and operations are the same as those of the first embodiment.

FIG. 22 is a flowchart of the transport control in the replenishment operation of the second embodiment. First, it is determined whether or not there is paper on the mounting table (S401). If there is no paper, a message such as "There is no transfer paper on the mounting table" or "Please check the mounting table" is displayed in display 1 processing. Yes (S40
2).

When there is paper on the mounting table, first, it is determined whether the size of the paper in the first-stage paper cassette (paper feeding cassette 131) and the size of the paper on the mounting table are the same ( S403). Here, if the paper sizes are not the same, "1" is set to the flag FS1 indicating that supply to the first-stage paper feed cassette is impossible.

On the other hand, if the paper sizes are the same,
It is determined whether or not the flag FS1 indicating that supply to the first-stage paper cassette is not possible is "1" (S405).
If it is not "1", it is determined whether or not the first-stage paper cassette is full based on the output of the load amount detection sensor S11 (S406). If it is not full, the first-stage paper cassette is displayed as the supply destination (S408), and the first-stage supply operation is started (S409). This replenishment operation is performed until there is no more paper on the mounting table (S411). Also, if the number of sheets M _1, which is supplied to the first-stage paper feed cassette before the sheet of the mounting table is eliminated reaches a predetermined number M (S41
In step 0), the process proceeds to the processing of the second-stage paper cassette in the subsequent steps.

If the first-stage paper cassette is full at S406, "1" is set to the flag FS1 indicating that the first-stage paper cassette cannot be replenished. To proceed to the processing of the second sheet cassette.

In steps (not shown) following S404, S407 and S410, S403 to S411 are performed on the second-stage paper cassette (paper cassette 132).
The same processing as described above is performed, and thereafter, the third sheet feeding cassette (sheet feeding cassette 133) is also subjected to steps S403 to S411.
The same processing as described above is performed.

After the processing of the third-stage paper feed cassette, the fourth-stage paper feed cassette (paper-feed cassette 134) is
The processing of 412 to S420 (the same processing as S403 to S411) is performed.

Next, in S421, flags FS1, FS2, FS3, and FS indicating that supply is impossible.
It is determined whether or not all 4 are “1”. Here, FS1
If FS4 is all "1", it indicates that replenishment is not possible for all paper cassettes and there is no suitable replenishment destination. A message such as "This paper cannot be replenished" is displayed (S422).

On the other hand, if at least one of FS1 to FS4 is not "1", it indicates that there is a sheet cassette that can be replenished, and the flow returns to S401 to repeat the above replenishment operation. Run.

Therefore, the first stage,
It is determined in the order of the second, third, and fourth stages whether the paper size of the paper cassette and the paper size of the mounting table are the same size, and whether the paper is in a replenishable state (not full). Is determined, and if the sizes are the same and the replenishment is possible, the replenishment operation is executed with the corresponding paper cassette as the replenishment destination. In S410 and S419, when a predetermined number M of paper is replenished in one paper cassette, the process proceeds to the next paper cassette. For example, a paper cassette having the same size and being replenishable is used. If a plurality of paper cassettes exist, a predetermined number of sheets M are sequentially supplied to the plurality of paper cassettes. As described above, by managing the number of sheets to be replenished to the paper feed cassettes, distributing the paper conveyance to a plurality of paper feed cassettes, and averaging the use of the replenishment conveyance system 140, a long service life of the apparatus can be expected.

When there are a plurality of replenishable paper feed cassettes, the replenishment destination is selected in the above-mentioned priority order, and when one paper feed cassette becomes full, the next replenishable paper feed cassette is automatically set. The cassette is selected as a replenishing destination, and replenishment is continued until there is no more paper on the mounting table.

As described above, in the second embodiment, when there are a plurality of sheet cassettes that can be replenished, the replenishment / transport system 140 can be used evenly by replenishing the plurality of sheet cassettes evenly.

[Third Embodiment] The copying apparatus of the third embodiment is different from the first embodiment only in the flow chart of the transport control in the replenishment operation, and the other configurations and operations are the same as those of the first embodiment.

FIG. 23 is a flowchart of the transport control in the replenishment operation of the third embodiment. In the third embodiment, only fixed paper cassettes (paper cassettes 131 and 132) are targeted as automatic replenishing destinations.
Only when c and 309d are pressed down is the supply destination.

First, it is determined whether or not there is paper on the mounting table (S501). If there is no paper, the display 1 processing indicates that "there is no transfer paper on the mounting table" and "Please check the mounting table."
Is displayed (S502).

Next, reference is made to a count value n indicating which paper cassette of the first and second paper cassettes is to be replenished with paper (S503). If n is an even number, S504 is executed.
In steps S509 to S509, the supply process to the first-stage paper cassette is executed. If n is an odd number, the supply process to the second-stage paper cassette in S510 to S516 is executed.

At this time, in S504 and S505,
If the size of the first-stage paper cassette does not match the size of the paper on the mounting table, or if the first-stage paper cassette is full, the first-stage paper cassette is disabled in step S509. Is set to “1” in the flag FF indicating that In S508, “1” is added to the count value n.

On the other hand, in the process of replenishing the second-stage paper cassette, the sizes of the second-stage paper cassette and the paper on the mounting table do not match in S510 and S511, and If the paper cassette is full, it is determined in step S515 whether the flag FF is "1" (that is, the first-stage paper cassette is in an unusable state). In the display 2 process, a message such as "There is no suitable supply destination" or "This paper cannot be supplied" is displayed. In S514, “1” is added to the count value n.

Therefore, it is determined which of the first and second paper feed cassettes is to be preferentially replenished with the paper on the mounting table according to the count value n. If the first and second paper cassettes have the same size and both can be replenished, the replenishment key 221a of the function selection unit 220 is pressed, and then the start key 303 of the operation display unit 300 is depressed. Each time a supply start instruction is input, the supply destination is switched.

As described above, in the third embodiment, when there are a plurality of sheet cassettes that can be replenished, the replenishment / transport system 140 can be used evenly by replenishing them evenly. Further, since the supply destination is changed each time the supply start instruction is given, even if the supply time is lost when the supply destination is switched, the speed and reliability can be improved, and the supply / transport system 140 can be evenly distributed. The effect of using it can be sufficiently exhibited.

[0151]

As described above, in the image forming apparatus of the present invention (claims 1 to 7), when a sheet is placed on the sheet placing means, the sheet is automatically conveyed to the sheet storage unit by the conveying means. Workability for paper supply can be improved, supply operation can be simplified, and paper supply can be performed easily. Also,
It is possible to provide a new function capable of easily and efficiently supplying paper.

Further, the image forming apparatus of the present invention (Claim 1)
If the paper size of the fixed paper storage unit and the size of the variable-size paper storage unit match, the transport control of the transportation unit is performed with the fixed paper storage unit or the variable-size paper storage unit having the same paper size as the destination. In this case, since the fixed paper storage unit is used as the transport destination, the probability that the variable-size paper storage unit is empty increases, and the opportunity to utilize the size changing function of the variable-size paper storage unit can be increased. Performance can be improved.

Further, the image forming apparatus of the present invention (Claim 2)
In order to perform feeding control that gives priority to feeding from the variable-size paper storage unit when paper of a predetermined size is present in both the fixed paper storage unit and the variable-size paper storage unit, Is increased, the chances of utilizing the size changing function of the size-variable paper storage unit can be increased, and the convenience of the apparatus can be improved.

Further, the image forming apparatus of the present invention (Claim 3)
Since the variable-size paper storage unit is located farther away from the image forming means than the fixed paper storage unit in the transfer path, the transfer path of the frequently used fixed paper storage unit is shortened, and Can be enhanced.

Further, the image forming apparatus of the present invention (Claim 4)
When the fixed paper storage section or the variable-size paper storage section to which the paper is transported from the paper mounting means is full, the paper is transferred to another fixed paper storage section or a variable-size paper storage section where sheets can be loaded. Since the conveyance control of the conveyance unit is performed by changing the destination, the operability and workability of sheet supply can be improved.

Further, the image forming apparatus of the present invention (Claim 5)
Means that if there is no paper in the variable-size paper storage unit and there is no fixed paper storage unit or variable-size paper storage unit that can store the paper size placed on the paper loading means, An indication as to whether or not the size of the set is to be changed is displayed, and when the size change is input via the predetermined input means, the size of the sheet that can be stored in the size-variable sheet storage section is changed and the sheet is set on the sheet placing means. Since the loaded paper is conveyed to the variable-size paper storage unit, the operability and workability of paper supply can be improved.

Further, the image forming apparatus of the present invention (Claim 6)
If there are multiple paper storage units that can store paper,
Since the paper is sorted and transported to a plurality of paper storage units capable of storing a predetermined number of sheets, the resources of the apparatus can be used evenly.

An image forming apparatus according to the present invention (claim 7)
If there are multiple paper storage units that can store paper,
Since the paper is sorted and transported to a plurality of paper storage units that can be stored for each transport start instruction, the resources of the apparatus can be used evenly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an external view of a copying apparatus (image forming apparatus) according to a first embodiment.

FIG. 2 is an explanatory diagram showing a configuration of a copying apparatus main body and an automatic original / transfer sheet transport device according to a first embodiment.

FIG. 3 is an explanatory diagram illustrating a configuration of an operation display unit.

FIG. 4 is a perspective view of the automatic original / transfer paper transport device as viewed from the front right of the device.

FIG. 5 is an explanatory diagram illustrating a configuration of a sheet mounting table and a separation sheet feeding unit.

FIG. 6 is an explanatory diagram showing an arrangement of a size detection sensor S1.

FIG. 7 is an explanatory diagram illustrating a configuration of a function selection unit for selecting a function of the automatic original / transfer sheet transport device.

FIG. 8 is an explanatory diagram illustrating a configuration of a main control unit.

FIG. 9 is an explanatory diagram illustrating a configuration of a sheet feeding cassette.

FIG. 10 is an explanatory diagram illustrating a configuration of a paper end detection mechanism.

FIG. 11 is an explanatory diagram showing a jogger mechanism mounted in a paper feed cassette having a variable paper size.

FIG. 12 is an explanatory diagram illustrating a sheet entry gate of a sheet cassette with a variable sheet size.

FIG. 13 is an explanatory diagram illustrating switching of sheet conveyance by a switching unit.

FIG. 14 is a main control flowchart showing a control operation of a main control unit.

FIG. 15 is a main control flowchart showing a control operation of a main control unit.

FIG. 16 is a main control flowchart showing a control operation of a main control unit.

FIG. 17 is a main control flowchart showing a control operation of a main control unit.

FIG. 18 is a flowchart of an upper mounting table supply operation.

FIG. 19 is a flowchart of an upper mounting table supply operation.

FIG. 20 is a flowchart of an upper stage mounting table supply operation.

FIG. 21 is a flowchart of a sheet cassette operation.

FIG. 22 is a flowchart of a transport control in a replenishing operation according to the second embodiment.

FIG. 23 is a flowchart of a transport control in a replenishing operation according to the third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Copier main body 120 Image forming system (image forming means) 127 Fixing device 130 Paper storage / feeding system 138 Separation feeding device (separating feeding device) 140 Replenishment feeding system (transporting device) 200 Automatic document / transfer paper feeding device 201 202 Sheet placement table (sheet placement means) 210 Separate sheet feeding section (transportation means) 220 Function selection section 300 Operation display section 401 Main control section (control means) S1 Size detection sensor S11 Load amount detection sensor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Naoki Sato, Inventor Ricoh, 1-3-6 Nakamagome, Ota-ku, Tokyo (72) Tomoko Takahashi, Inventor Tomoko Takahashi 1-3-6, Nakamagome, Ota-ku, Tokyo No. Ricoh Co., Ltd. (56) References JP-A-63-8131 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65H 1/30 320 B65H 3/44 342 B65H 83 / 00

Claims (7)

(57) [Claims] 1. A fixed paper storage section in which a storable paper size is fixed, a variable-size paper storage section capable of changing a storable paper size, and stored in the fixed paper storage section and the variable-size paper storage section. A plurality of separating and feeding means for separating and feeding the sheets one by one; an image forming means for forming an image on the sheet fed by the separating and feeding means; Sheet placement means; transport means for selectively transporting a sheet placed on the sheet placement means to either the fixed sheet storage section or the variable-size sheet storage section; Paper size detection means for detecting the size of the paper placed on the means, stackable paper size recognition means for recognizing the stackable size of the fixed paper storage section and the size-variable paper storage section; Based on the paper size detected by the stackable paper size recognition unit, the conveyance control of the conveyance unit is performed with the fixed paper storage unit or the variable size paper storage unit having the same paper size as the conveyance destination. An image forming apparatus, comprising: control means for controlling conveyance of the conveyance means with the fixed paper storage section as a conveyance destination when both paper sizes of the variable-size paper storage section match. 2. The apparatus according to claim 1, wherein the control unit performs a feeding control for selectively operating the plurality of separation feeding units in order to feed a sheet of a predetermined size. 2. The image forming apparatus according to claim 1, wherein when the sheet is present in both the fixed sheet storage section and the size-variable sheet storage section, feeding control is performed to give priority to feeding from the size-variable sheet storage section. . 3. The image according to claim 1, wherein the size-variable sheet storage unit is disposed farther from the image forming unit in a conveyance path than the fixed sheet storage unit. Forming equipment. 4. A fixing device according to claim 1, further comprising: a full detecting unit configured to detect a full state of the sheets loaded in the fixed sheet storing unit and the variable size sheet storing unit. When the paper storage section or the variable-size paper storage section is full, the transport destination of the paper is changed to another fixed paper storage section or a variable-size paper storage section on which sheets can be loaded, and the transport control of the transport means is performed. The image forming apparatus according to claim 1, wherein: 5. A paper presence / absence detection means for detecting that there is no paper in the size-variable paper storage section, wherein the control means has no paper in the size-variable paper storage section and places the paper on the paper placement means. If there is no fixed paper storage unit or variable-size paper storage unit that can store the placed paper size, an indication is displayed as to whether or not to change the size of the variable-size paper storage unit with no paper. When a size change is input, the paper size that can be stored in the variable-size paper storage unit is changed, and the paper placed on the paper mounting unit is transported to the variable-size paper storage unit. The image forming apparatus according to claim 1. 6. A plurality of paper storage units for storing paper, a plurality of separation feeding means for separating and feeding the paper stored in the paper storage unit one by one, and a plurality of papers fed by the separation feeding means. An image forming means for forming an image on the sheet, a sheet placing means disposed in a state exposed to the outside of the apparatus, and a sheet placed on the sheet placing means to one of the sheet storage sections. Transport means for alternatively transporting, and control means for performing transport control of the transport means and selectively transporting the paper placed on the paper placing means to a paper storage unit capable of storing the paper. An image forming apparatus, wherein, when there are a plurality of paper storage units capable of storing sheets, the control unit sorts and transports the sheets to a plurality of paper storage units capable of storing a predetermined number of sheets. 7. A plurality of paper storage sections for storing paper, a plurality of separation feeding means for separating and feeding the paper stored in the paper storage section one by one, and a plurality of papers fed by the separation feeding means. An image forming means for forming an image on the sheet, a sheet placing means disposed in a state exposed to the outside of the apparatus, and a sheet placed on the sheet placing means to one of the sheet storage sections. Transport means for alternatively transporting, transport start instructing means for instructing the start of operation of the transport means, and transport control of the transport means, whereby sheets placed on the paper placing means can be stored. Control means for selectively transporting the paper to a suitable paper storage unit, wherein the control means, when there are a plurality of paper storage units capable of storing the paper, a plurality of paper storage units capable of storing the paper for each transport start instruction Image forming apparatus characterized in that the image forming apparatus Place.