JP2001328760A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device with short latency time, capable of monitoring change of status of a paper discharge tray or a paper feed tray even in a pause mode and of quickly recovering from the pause mode and resuming a job when a paper sheet is removed. SOLUTION: It is determined whether +5VE has changed into the pause mode by monitoring the status of the +5VE (Step 401). When the +5VE is in the pause mode, it is determined whether the status of discharged paper has changed from 'with' to 'without' by checking the status of a paper discharge sensor (a paper detection sensor 307) (Step 402). When the status of discharged paper has changed from 'with' to 'without' on Step 402, +24VE is switched on (Step 404) and it is determined whether a discharge tray is in a home position (HP) (Step 405). If the discharge tray is not in the home position, the discharge tray is raised to the home position (Step 406). If the discharge tray is determined to be in the home position by checking on Step 405, ascent of the discharge tray is stopped (Step 407), and the +24VE is switched off after a predetermined time lapse (Step 408), and then the mode changed into a normal pause mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Image forming apparatus such as a copying machine, a printer, a facsimile, etc., which includes at least one of a paper discharge tray having a raising and lowering function, a plurality of paper feeding trays, and a paper feeding tray having a raising and lowering function. Related to the device.

[0002]

2. Description of the Related Art As this kind of technology, (1) JP-A-8-2
The inventions described in JP-A-51317, (2) JP-A-9-02730, (3) JP-A-9-90820 and the like are known.

[0003] In the known technique (1), when the controller shifts to power saving, the power supply on the engine control side is turned off. In addition, the known technique of (2)
A power saving mode is provided in which only peripheral devices that need to operate are allowed to supply power. Further, in the known technique (3), when the tray is moving to replenish sheets at the time of shifting to the power saving mode, the mode is shifted to the power saving mode only after the movement is completed.

[0004]

However, the above-mentioned (1)
In the inventions of (3) and (4), when the apparatus enters the power saving mode (pause mode), the power supply on the engine control side is turned off, so that it is not possible to monitor the change in the state of the paper discharge tray.
If the paper is removed from the paper output tray, the paper output tray remains down, and even if work is resumed,
The operation could not be started until the upper surface of the paper on the paper output tray was raised to a predetermined position near the paper output port.

According to the known technique (3), before shifting to the power saving mode, the mode may be shifted to the power saving mode in a state in which the sheet feeding tray is lowered to the bottom in some cases in order to supply paper. When the power saving mode is released from the power saving mode in such a state, the time required for the paper feed tray to move from bottom to top has been a waiting time.

[0006] The same can be said for the paper supply side. However, since the paper supply is performed in the pause mode, if the paper supply tray is lowered, the work cannot be started immediately when the work is resumed. .

[0007] The present invention has been made in view of such a situation of the prior art, and a first object of the present invention is to monitor a change in the state of a paper discharge tray or a paper supply tray even in a pause mode. Another object of the present invention is to provide an image forming apparatus with a short waiting time, capable of promptly resuming the operation when returning from the sleep mode even when the sheet is removed.

A second object of the present invention is to achieve total power saving by enabling a transition from a movable state of a tray to a sleep mode during power saving.

[0009]

In order to achieve the above object, a first means is a paper loading means for loading a discharged image-formed sheet on a discharge tray capable of moving up and down, and the paper loading means. In an image forming apparatus including a driving unit that drives the unit and a control unit that controls the driving unit, supply of power to each driving unit of the sheet stacking unit is stopped,
The control unit is set to a sleep mode in which the power supply is performed in a standby state, and a power supply to a desired driving unit is performed, and an operation mode for driving the driving unit as necessary is set. When the detecting means for detecting the presence or absence of a sheet at a predetermined position on the sheet discharge tray in the pause mode detects a change from the sheet-present state to the sheet-absent state, the operation mode is shifted to the operation mode.

The second means is an image forming apparatus based on the same premise as the first means, in which the supply of power to each drive unit of the paper stacking means is stopped, and the supply of power to the control means is stopped. A sleep mode in which the drive unit is in a standby state in a closed state and an operation mode in which power is supplied to a desired drive unit and the drive unit is driven as necessary are set. When the detecting means for detecting the presence or absence of the sheet at the position detects the presence of the sheet, the mode shifts to the operation mode.

The third means is characterized in that, in the first or second means, after a transition to the operation mode, the discharge tray moves to the home position and a predetermined time elapses, and then a transition is made to a pause mode. .

The fourth means includes a plurality of paper feed trays on which paper for forming an image is stacked, a paper feed means for taking out paper from the paper feed tray, and a driving means for driving the paper feed means. In the image forming apparatus provided with control means for controlling the driving means, supply of power to each driving means of the paper feeding means is stopped, and power is supplied to the control means. A standby mode for standby, power supply to a desired drive unit is performed, and an operation mode for driving the drive is set as necessary. Insertion and removal of the paper feed tray are performed in the pause mode, and When it is detected that the paper tray has been set again, the operation mode is shifted to the operation mode.

In a fifth aspect, in the image forming apparatus based on the same premise as the fourth means, the supply of power to each of the driving means is stopped, and the power is supplied to the control means. A standby mode for standby, power supply to a desired drive unit is performed, an operation mode for driving the drive is set as needed, and the cover of the sheet feed tray is opened and closed during the pause mode, When detecting that a sheet is set in the sheet feed tray, the operation mode is shifted to an operation mode.

The sixth means is characterized in that in the fourth or fifth means, after the mode is shifted to the operation mode, a sheet can be fed, and then the mode shifts to the sheet feeding mode after a lapse of a predetermined time. And

[0015]

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

1. 1. First Embodiment 1.1 Overall Configuration First, a schematic configuration of a digital copying machine according to a first embodiment will be described. FIG. 1 is a configuration diagram showing an entire digital copying machine as an image forming apparatus according to this embodiment.

As shown in FIG. 1, the digital copying machine includes a copying machine body (I) and an automatic document feeder [ADF] (II).
A finisher (III) with a shift tray capable of abolishing a large amount of staplers and formed images, a duplex reversing unit (IV), an extended paper tray (V), and a large-capacity paper tray LCIT (VI). ) And a one-bin discharge tray (VII). The copying machine main body (I) includes a scanner unit, a writing unit, a photoconductor unit, a developing unit, a paper feeding unit, and the like.

1.2 Electrical Control Unit 1.2.1 Overall Control System FIG. 2 is a block diagram showing the overall control system of the digital copying machine shown in FIG.

In FIG. 2, the mechanism control unit of the copying machine includes one MPU and one CPU. An MPU 200 mounted on the main control board 206 performs an image forming sequence, a fixing control, and a system-related control. The CPU 201 mounted on the control board 205 controls scanners. The MPU 200 and the CPU 201 are connected by image data and a serial interface. The scanner control board 205 includes an operation unit 203 and a reading control board (SB) on which a CCD is mounted.
U) 209, ADF, APS, printer controller 2
12. A fax controller (FCU) 211 and the like are connected. On the other hand, the main control board 206
O control board 204, LD control board 207, motherboard (M
/ B) 210, a DC power supply / AC control board 220, etc. are connected, and a paper feed control board 208, a double-sided drive board 215, a relay unit, a one-bin tray, a key card / coin rack via the I / O control board 204 , A mechanical tank, various sensors, various actuators, and the like.
The paper feed control plate 208 includes a paper feed bank 216 and an LC
T217, various sensors and actuators are connected.

The motherboard 210 functions as an application extension unit for realizing a composite function, and a printer controller 21 for controlling a printer function and a composite operation mode of copy, facsimile, and printer.
2 and an FCU 211 equipped with a FAX function. The polygon motor is controlled by a main control board 206, and various motors, a high voltage power supply, a fixing heater, a mail box, and a finisher 218 are connected to the DC power supply / AC control board 220.

1.2.2 Connection Relationship between Control Board and Power Supply FIG. 3 is a block diagram showing the connection relationship between each control board and the power supply in the digital copying machine according to the present invention.

The main control board 206 which controls the mechanical control of this apparatus includes the MPU 200, the CPU peripheral ASIC 22
1, an image processing ASIC 230, and an I / F 224 having an interface with a printer controller and an image data compression / decompression function.

An MPU 225 for realizing a composite function is provided to the printer controller 212 for controlling the system.
Interface with the main control board 206 and the operation unit 20
Peripheral A provided with a communication function with the C.3 and a memory control function
The SIC 226 is mounted.

The analysis and display control of the key data from the operation unit 203 is controlled by the M
The PU 225 performs control, and the peripheral ASIC 226 takes charge of the I / F. The ASIC 226 is connected to the operation unit 203 via a motherboard 210 and a main control board 204.

1.2.3 Configuration of Power Supply to Each Board Next, a specific configuration of power supply to each board will be described.

The power supply of the controller 212 is supplied with +5 V which is energized even in the power saving mode. Also,
The main control board 206 is turned on in the power saving mode.
+ 5VE to be fed is supplied.

Also, the I / O control board 204 has +5 VE and +24 V, which are similarly turned off in the power saving mode.
E are supplied respectively. Also, the finisher 21
The control plate 8 is supplied with +24 V, which is in an energized state during power saving, and +5 VE, in which energization is turned off.

The DC power supply / AC control board 220 has switch means (S
W) 301 and 302 are mounted. This SW30
A signal is output from the printer controller 212 to perform ON / OFF of the power supplies 1 and 302. In the power saving mode, the output is turned off to + 24VE and + 5VE by turning off the SW 301 and 302 with this signal. Has become.

In addition to the signal from the printer controller 212, the SW 301 of the finisher 218
The control can also be performed from the PU 303, and the output is turned off only when both are off.

The finisher 218 has a dedicated CPU 3
03 is provided to control various internal actuators.

The power supply of the CPU 303 is generated by the DC-DC converter 304 from +24 V which is energized even in the power saving mode.
U303 is always energized.

The power supply of the motor 305 for raising and lowering the discharge tray is connected to +24 VE which is turned off in the power saving mode, and the motor 305 is in the off state, but the state of the paper detection sensor 307 changes from the presence state to the absence state. Then C
The PU 303 turns on the SW 301 to turn on the motor 305.
To the activated state, and then the driver 30
By turning on the motor 6 and driving the motor 305, the paper discharge tray can be moved to a predetermined position.

When the presence of paper is detected by the paper presence detection sensor 307 in the power saving mode, the SW 301 can be turned on and +24 VE can be kept energized. In this case, after the paper is removed and the tray moves to a predetermined position, the SW 301 is turned off when a predetermined time has elapsed.
It is also possible to shift to the power saving mode by pressing F.

1.3 Operation FIGS. 4 and 5 are flowcharts showing the operation procedure of the image forming apparatus according to this embodiment.

FIG. 4 shows that in the pause mode, the power supply of the discharged paper detection means is turned on by the power supply control means to activate the detection means, while the power supply to the discharge tray drive means is turned off. When the state of the discharged paper by the discharged paper detecting means changes, the power supply of the discharge tray driving means is turned on by the power supply control means, so that the discharge tray driving means is activated. By driving the paper discharge tray driving means, the paper discharge tray can be moved to a predetermined position. If the paper discharge detection means detects the absence of paper, the paper discharge tray drive is performed again after counting a predetermined time. An operation procedure is shown in which the power of the means is turned off to shift to a sleep mode state.

In this process, the DC power / AC control board 22
By monitoring the state of + 5VE output from the SW 302 of 0, it is determined whether or not it has been turned off, that is, whether or not it has entered the sleep mode (step 401). Step 4
01, that is, when the sleep mode is entered, the state of the paper discharge sensor (paper presence sensor 307) is checked to see if there is any paper on the paper discharge tray, and the sensor 307 changes from presence to absence. It is determined whether or not the process has been performed (step 402). If there is no change, the + 24VE is turned off and the process returns to the monitoring of + 5VE (step 40).
3). If this state is maintained, it indicates that the sleep mode is continued.

On the other hand, at step 402, the paper discharge sensor 307
+ 24VE is ON when changes from "with" to "without"
(Step 404), and it is determined whether or not the sheet discharge tray is at the home position (HP) (Step 40).
5). If the output tray is not in the home position,
The discharge tray is raised and moved to the home position (step 406). If the paper discharge tray is at the home position in the check at step 405, the lifting of the paper discharge tray is stopped (step 407), and after a lapse of a predetermined time, +24 is reached.
VE is turned off (step 408), and the mode shifts to a normal sleep mode.

FIG. 5 shows that the mode can be shifted to the sleep mode after a predetermined time from the standby state or by a predetermined operation.
If the discharged sheet detection means detects that there is a sheet to be discharged, even if the transition condition to the pause mode is satisfied, the transition to the pause mode is not performed, and the discharged power is reduced to the energy consumption in the pause mode. The power of the paper detecting means is turned on by the power control means.
The state shifts to the second sleep mode state to which the electric power at the time of the N state is applied, and in the second sleep mode, when the discharged paper detection means detects that there is no paper, the discharge tray control means If the state of the discharged-paper detecting means does not change after counting the fixed time after moving the position of the discharged-sheet tray to the predetermined position by controlling the discharge-tray driving means, 2 shows an operation procedure of shifting to a sleep mode state by turning off the power supply.

In this process, the DC power / AC control board 22
By monitoring the state of + 5VE output from the SW 302 of 0, it is determined whether or not it has been turned off, that is, whether or not it has entered the sleep mode (step 501). Step 5
When it is turned off at 01, that is, when it enters the pause mode, the state of the paper discharge sensor (paper presence sensor 307) is checked this time, and it is determined by the sensor 307 whether there is paper on the paper discharge tray (step 502). ). Sensor 3
07 does not detect the presence of paper, + 24VE is OF
F, and returns to + 5VE monitoring (step 503). If there is paper, + 24VE is turned on (step 50).
4) Then, it is checked whether or not the sensor 307 has changed from the presence of paper to the absence of paper (step 505). And sensor 3
When 07 changes from the paper-present state to the paper-out state, it is determined whether or not the discharge tray is at the home position (step 506). If not in home position, H
The discharge tray is raised until the sheet reaches P (step 50).
7, 505, 506), if it is at the home position or at the time of ascending to the home position, the lifting of the paper discharge tray is stopped (step 508), and after a lapse of a predetermined time, + 24VE is turned off and the mode is again shifted to the sleep mode (step 508). Step 509).

By configuring and processing as described above, even if the discharged paper is removed (the discharged paper is removed and the paper discharge sensor 307) even in the power saving mode (pause mode).
Only when there is no paper), the output tray can be moved to the home position only by a slight increase in power, and the waiting time for raising the tray when returning from the sleep mode to the standby mode is reduced. be able to.

2. Second Embodiment Hereinafter, a second embodiment will be described.

2.1 Overall Configuration The overall configuration is the same as that of the digital copying machine according to the first embodiment shown in FIG.

2.2 Electrical Control Unit 2.2.1 Overall Control System The overall control system has the same system configuration as the digital copying machine according to the first embodiment shown in FIG.

2.2.2 Connection Relationship Between Control Board and Power Supply FIG. 6 is a block diagram showing the connection relationship between each control board and the power supply in the digital copying machine according to the present embodiment.

In this embodiment, instead of the finisher 218 in the first embodiment shown in FIG.
08 indicates the connection relationship of the mechanism on the paper feed side. Main control board 206, printer controller 21
2. I / O control board 204, DC power supply / AC control board 220
Are the same as those in the first embodiment.

2.2.3 Configuration of Power Supply to Each Board Next, a specific configuration of power supply to each board will be described.

The power supply of the controller 212 is supplied with +5 V which is energized even in the power saving mode. Also,
The main control board 206 is turned on in the power saving mode.
+ 5VE to be fed is supplied.

Also, the IO control board 204 has + 5VE and + 24VE which are turned off during the power saving mode.
Are supplied respectively. Also, the finisher 218
Are supplied with + 24V, which is in the energized state during power saving, and + 5VE, which is turned off when the power is saved.

The DC power supply 220 has a converter output 2
Switch means (SW) 301, 3 to 4V and 5V respectively
02 is mounted. ON of these switches 301 and 302
/ OFF signal is sent to the printer controller 21
2, and in the power saving mode, the signals SW301 and 302 are turned off by this signal to increase the voltage of +24 VE.
And the output is turned off at + 5VE. Up to this point, the operation is the same as that of the first embodiment.

The SW 301 is supplied with the CP of the paper feed control plate 208 separately from the signal from the printer controller 212.
Control can also be performed from U313, and the output is turned off only when both are off.

The paper feed control plate 208 has a dedicated CPU 31
3 for controlling various actuators in the sheet feeding unit.

The power supply of the CPU 313 is generated by the DC-DC converter 304 from +24 V which is energized even in the power saving mode.
U313 is always in an energized state.

The power supply for the motor 315 for raising and lowering the paper feed tray is connected to + 24VE which is turned off in the power saving mode.
When the tray insertion / extraction detection sensor 317 detects the insertion / removal of the tray, the CPU 313 turns on the SW 301 to shift the power supply of the motor 315 for raising and lowering the paper feed tray to an activated state, and then turns on the driver 316 to drive the motor. The paper feed tray can be moved to a predetermined position. After that, when a certain time elapses, SW30
1 can be turned off to shift to the power saving mode.

2.3 Operation FIGS. 7 and 8 are flowcharts showing the operation of the image forming apparatus according to the second embodiment.

FIG. 7 shows that the power supply of the tray insertion / removal detection means or the cover opening / closing means is turned on by the power supply control means to activate the detection means in the halt mode state.
The power supply to the paper feed tray driving means is turned off, and when it is determined that the replenishment state of the paper feed by the tray insertion / removal detection means or the cover open / closed paper detection means has changed, the power supply of the paper feed tray driving means is changed to a power supply control means By turning on the paper feed tray driving means, the paper feed tray driving means is activated, and the paper feed tray drive means is driven to drive the paper feed tray to a predetermined position. When the change from the absence of paper to the presence of paper is detected, or when the absence of paper is detected after the movement of the paper feed tray is completed by the paper feed tray driving means, the paper feed tray is counted again after a certain period of time. An operation procedure of shifting to a sleep mode state by turning off the power of the driving unit is shown.

In this processing, the DC power / AC control board 22
By monitoring the state of + 5VE output from the SW 302 of 0, it is determined whether or not it has been turned off, that is, whether or not the apparatus has entered the sleep mode (step 701). When the tray is turned off in step 701, that is, when the apparatus enters the pause mode, it is determined whether or not the tray has been removed or inserted based on the state of the tray insertion / removal sensor 317 (step 70).
2). If there is no change, turn off + 24VE and
Return to monitoring of 5VE (step 703). Tray insertion / removal refers to insertion / removal of a tray from / to the bank 216, and this insertion / removal is detected from a sensor output input to the paper feed control plate.

On the other hand, if it is determined that the tray has been inserted or removed according to the state of the toilet
24VE is turned on (step 704), and it is determined whether there is a sheet next (step 705). If there is no paper, raise the paper feed tray (LCT) (step 7).
06) If not, the detection of the presence or absence of paper is continued until the upper limit is reached (steps 707, 705, 70).
6). If the paper feed tray reaches the upper limit without paper, the paper feed tray is lowered (step 708). If paper is detected before the upper limit is reached, the tray is not lowered, and then the paper feed tray is Is stopped (step 709),
After a certain period of time, + 24VE is turned off, and the mode shifts to a normal sleep mode (step 710).

FIG. 8 shows a state after a predetermined time from the standby state or
The transition to the sleep mode is enabled by a predetermined operation, and when the paper supply sheet detecting unit detects that there is no paper, the transition to the sleep mode is not performed even if the transition condition to the sleep mode is satisfied, and the sleep mode is not set. To the second sleep mode state in which the power when the power of the paper feed detecting means is turned on by the power control means is added to the energy consumption power of the tray. Alternatively, if it is determined that the sheet is replenished by the first stage of the cover opening / closing detection, the sheet feeding tray control unit controls the sheet feeding tray driving unit to move the position of the sheet ejection tray to a predetermined position. When it is determined that there is paper, if the state of the paper feed detecting means does not change during a certain period after counting, the power supply of the paper feed tray driving means is turned off, and the pause mode is set. Shows an operation procedure to migrate to the state.

In this process, the DC power / AC control board 22
By monitoring the state of + 5VE output from the SW 302 of 0, it is determined whether or not it has been turned off, that is, whether or not the apparatus has entered the sleep mode (step 801). Step 8
When it is turned off at 01, that is, when it enters the pause mode, it is determined whether there is any paper in the paper feed tray (step 802). And if there is paper,
24VE is turned off, and the process returns to + 5VE detection again (step 803). If there is no paper, + 24VE is turned on (step 804), and the tray insertion / removal sensor 317
It is checked whether or not the detection state, that is, the insertion / removal state of the sheet feeding tray has changed (step 805).

If there is no change, this check is repeated until there is a change, and when there is a change, the presence or absence of a sheet is checked again (step 806). If there is no paper, the paper feed tray is raised (step 807), and the detection of the presence of paper is repeated until the upper limit is reached (step 80).
8, 806, 807). If the tray has reached the upper limit without any paper, the paper feed tray is lowered (step 80).
9) If the paper is detected before reaching the upper limit, the tray is not lowered, and then the discharge tray is stopped (step 8).
10) After a certain period of time, + 24VE is turned off, and the mode shifts to a normal sleep mode (step 811).

With the above configuration, even in the power saving mode (pause mode), when the paper is replenished, the paper can be moved to the home position for paper supply with only a slight increase in power. Waiting time for raising the tray when returning to standby can be reduced.

[0062]

As described above, according to the first aspect of the present invention, the pause mode and the operation mode are set, and the detecting means for detecting the presence or absence of a sheet at a predetermined position on the discharge tray in the pause mode. When it detects that the state has changed from the paper present state to the paper out state, it shifts to the operation mode.
That is, even in the pause mode, the change of the state of the discharge tray is monitored, and when the paper is removed, the operation mode is shifted to the operation mode. Therefore, when returning from the pause mode, the work can be quickly resumed. An image forming apparatus can be provided.

According to the second aspect of the present invention, a pause mode and an operation mode are set, and when the detection means for detecting the presence or absence of a sheet at a predetermined position on the sheet discharge tray detects the presence of a sheet in the pause mode. Since the operation mode is shifted to the operation mode, it is possible to provide an image forming apparatus with a short waiting time, in which the work can be quickly resumed when returning from the sleep mode.

According to the third aspect of the invention, after shifting to the operation mode, the discharge tray moves to the home position and shifts to the pause mode after a predetermined time has elapsed, so that the tray can be moved during power saving. After a lapse of a predetermined time, the mode shifts to the sleep mode, so that total power saving can be achieved.

According to the fourth aspect of the present invention, the sleep mode and the operation mode are set, and when the paper feed tray is inserted and removed in the sleep mode, and when it is detected that the paper feed tray is set again, Since the operation mode is shifted to the operation mode, it is possible to provide an image forming apparatus with a short waiting time, in which the work can be quickly resumed when returning from the sleep mode.

According to the fifth aspect of the present invention, the sleep mode and the operation mode are set, and the cover of the paper feed tray is opened and closed in the sleep mode, and it is determined that the paper is set in the paper feed tray. When the detection is detected, the operation mode is shifted to the operation mode. Therefore, it is possible to provide an image forming apparatus having a short waiting time and capable of quickly restarting the operation when returning from the sleep mode.

According to the sixth aspect of the present invention, after shifting to the operation mode, the sheet can be fed, and then the mode shifts to the pause mode after a predetermined time elapses. When a predetermined time elapses from the state in which the sheet can be used, the mode shifts to the sleep mode, and total power saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a digital copying machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating an electrical configuration of the digital copying machine according to the first embodiment.

FIG. 3 is a block diagram illustrating a connection relationship between each control board and a power supply of the digital copying machine according to the first embodiment.

FIG. 4 is a flowchart illustrating an operation procedure of the digital copying machine according to the first embodiment in a power saving mode.

FIG. 5 is a flowchart illustrating another operation procedure in the power saving mode of the digital copying machine according to the first embodiment.

FIG. 6 is a block diagram showing a connection relationship between each control board and a power supply of the digital copying machine according to the second embodiment.

FIG. 7 is a flowchart illustrating an operation procedure in a power saving mode of the digital copying machine according to the second embodiment.

FIG. 8 is a flowchart illustrating another operation procedure in the power saving mode of the digital copying machine according to the second embodiment.

[Explanation of symbols]

 200 MPU 201 CPU 203 Operation unit 204 I / O control board 205 Scanner control board 206 Main control board 207 LD control board 208 Feed control board 210 Motherboard 212 Printer controller 218 Finisher 220 DC power supply / AC control board 303, 313 CPU

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3F048 AA02 AA04 AA05 AB01 BA02 BB03 BB04 CB01 EA03 EA15 EB02 3F054 AA01 AC02 AC03 AC05 BA02 BD02 CA10 CA33 3F343 FA02 FB02 FB03 FB04 HA01 HA37 HA39 HC11 HD14 KB03 MB20 MC26

Claims (6)

[Claims] 1. A sheet stacking means for stacking a discharged image-formed sheet on a discharge tray capable of moving up and down, a driving means for driving the sheet stacking means, and a control means for controlling the driving means. In the image forming apparatus, the power supply to each driving unit of the paper stacking unit is stopped, and a standby mode in which power is supplied to the control unit and a standby mode is provided. Power supply is performed, and an operation mode for driving the drive unit is set as needed. In the pause mode, the detection unit that detects the presence or absence of a sheet at a predetermined position on the sheet discharge tray is in a sheet presence state. An image forming apparatus that shifts to an operation mode when it is detected that the state has changed to a state of no paper. 2. A sheet stacking means for stacking ejected image-formed sheets on a discharge tray capable of moving up and down, a driving means for driving the sheet stacking means, and a control means for controlling the driving means. In the image forming apparatus, power supply to each drive unit of the paper stacking unit is stopped, and a standby mode in which power is supplied to the control unit and a standby mode is provided. Power supply is performed, and an operation mode for driving the drive unit is set as necessary. In the pause mode, a detection unit that detects the presence or absence of a sheet at a predetermined position on the discharge tray detects the presence of a sheet. An image forming apparatus that shifts to an operation mode when the operation is performed. 3. The system according to claim 1, wherein after a transition to the operation mode, the discharge tray moves to a home position and a predetermined period of time elapses, then a transition is made to a pause mode.
The image forming apparatus as described in the above. 4. A plurality of paper feed trays on which paper for forming an image is stacked, paper feed means for taking out paper from the paper feed tray, and drive means for driving each drive unit of the paper feed means. An image forming apparatus including a control unit that controls the driving unit, wherein supply of power to each driving unit of the paper feeding unit is stopped, and power is supplied to the control unit. A standby mode for standby, power supply to a desired drive unit is performed, and an operation mode for driving the drive unit is set as necessary.In the pause mode, the paper tray is inserted and removed. An image forming apparatus characterized by shifting to an operation mode when detecting that the sheet feeding tray is set again. 5. A sheet feeding tray capable of loading and lowering sheets for forming an image, driving means for driving the sheet feeding tray and taking out the sheet from the sheet feeding tray, and controlling the driving means. The supply of power to each drive unit of the paper feed tray is stopped,
A sleep mode in which the control unit is on standby in a state where power is supplied and an operation mode in which power is supplied to a desired driving unit and the driving unit is driven as necessary are set, An image forming apparatus, wherein the cover of the sheet feeding tray is opened and closed in a pause mode, and when it is detected that a sheet is set in the sheet feeding tray, the image forming apparatus shifts to an operation mode. 6. The image forming apparatus according to claim 4, wherein, after a transition to the operation mode, a sheet can be fed, and a predetermined period of time elapses, then a transition to a pause mode is made.