Sheet output device and image forming apparatus capable of transporting discharged sheets from multiple discharge bins to stack

Information

  • Patent Grant
  • 6325368
  • Patent Number
    6,325,368
  • Date Filed
    Friday, October 8, 1999
    25 years ago
  • Date Issued
    Tuesday, December 4, 2001
    23 years ago
Abstract
A sheet output device having a stack for storing sheets and a plurality of discharge bins includes a sheet transport device for transporting a discharged sheet from a discharge bin to the stack and an indicator for indicating that the sheet has been transported by the sheet transport device, so that the user can know where the job sheet is to be output. The sheet output device further includes a memory for storing information related to a sheet output for each of the discharge bins, and the indicator indicates information related to the sheet transported by the sheet transport device.
Description




This application is based on Patent Application No. 10-287931 filed in Japan, the content of which is hereby incorporated by reference.




BACKGROUND OF THE INVENTION




1. Field of the Invention




The present invention relates generally to a sheet output device and to an image forming apparatus having a combination of a copying machine, a printer, a facsimile, or a combination of these devices and a sorter. The invention more particularly relates to a sheet output device and an image forming apparatus capable of transporting discharged sheets from a plurality of discharge bins to a large capacity stack.




2. Description of the Related Art




In the field of printers, sheet output devices having a plurality of discharge bins and a stack which can store a large number of paper sheets have been used. When a number of users share a printer having such a sheet output device, a discharge bin specific to each user is allocated and registered, and if a job sheet of a registered user is output, the job sheet is discharged onto the bin allocated to the user.




The capacity of sheets which can be stored in each discharge bin (bin capacity) is however limited, and if sheets continue to be output onto a particular discharge bin and the number of the output sheets reaches the storable bin capacity of the bin, sheets can be no longer output to that particular bin. As a result, if the number of output sheets to an discharge bin reaches the maximum storable capacity or if output job sheets are left behind for a prescribed time period at a discharge bin, the job sheets which have been output to the discharge bin are transported to the stack, so that sheets can be further output to the discharge bin.




In the conventional sheet output devices, however, a job sheet could be transported to a stack under a prescribed condition, even if the user (operator) lets the job sheet output to an discharge bin registered for the user. Therefore, when the user tries to take out the job sheet, he/she sometimes cannot be sure where a job sheet has been output, and might have to take time to look around all the discharge bins and the stack.




SUMMARY OF THE INVENTION




The present invention is directed to a solution to the above-described problem, and it is an object of the present invention to provide a sheet output device and an image forming apparatus which permit the user to know where a job sheet is to be output.




In order to achieve the above-described object, a sheet output device according to one aspect of the present invention having a stack for storing paper sheets and a plurality of discharge bins includes a sheet transport device for transporting a sheet from an discharge bin to the stack and an indicator for indicating first information that a sheet has been transported by the sheet transport device.




According to another aspect of the present invention, the image forming apparatus having a stack for storing paper sheets and a plurality of discharge bins includes a sheet transport device for transporting a sheet from an discharge bin to the stack and an indicator for indicating first information that a sheet has been transported by the sheet transport device.




According to the present invention, since transporting of an output sheet from a discharge bin to the stack is indicated, a sheet output device and an image forming apparatus can be provided which permit the user to know where a sheet is to be output.











The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.




BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a general view of a sheet output device according to one embodiment of the present invention;





FIG. 2

is a schematic cross sectional view for use in illustration of the general construction of a digital copying machine according to the embodiment;





FIG. 3

is a plan view of an operation panel provided on the top surface of the digital copying machine according to the embodiment;





FIG. 4

is a view for use in illustration of the construction of a staple sorter according to the embodiment;





FIGS. 5

to


10


are first to sixth views for use in illustration of the movement of a sheet set transport gate in the staple sorter according to the embodiment;





FIG. 11

is a block diagram showing the configuration of a control portion which controls the digital copying machine and stable sorter according to the embodiment;





FIG. 12

is a discharge bin information management table stored in a RAM according to the embodiment;





FIG. 13

is a stack information management table stored in a RAM according to the embodiment;





FIG. 14

is a flow chart showing the flow of sheet output processing according to the embodiment;





FIG. 15

is a flow chart showing the flow of mail bin processing according to the embodiment; and





FIG. 16

is a table showing the contents of the discharge bin information management table and stack information management table displayed at a liquid crystal display according to the embodiment by way of illustration.











DESCRIPTION OF THE PREFERRED EMBODIMENTS




A sheet output device according to one embodiment of the present invention will be described. The sheet output device includes a staple sorter


10


and a digital copying machine


200


connected thereto. Note that the same reference characters represent the same or corresponding portions in the figures.




Referring to

FIG. 1

, in digital copying machine


200


, an operation of the user is input through an operation panel


150


(see

FIGS. 2 and 3

) at the time of forming an image. In response to the input of the operation of the user, a circulating type automatic document feeder


500


placed on the top of digital copying machine


200


feeds a group of document sheets placed on a prescribed document transport tray to platen glass on a one-sheet basis. After the document is subjected to exposure process on the platen glass, document feeder


500


sequentially discharges the document from the platen glass.




Digital copying machine


200


forms an image on a paper sheet based on the image of the document read by the exposure process by electrophotography. The sheet having the image formed thereon is transported to staple sorter


10


, and then discharged onto a stack


20


in staple sorter


10


which will be described or a discharge bin in a bin assembly


30


.




Referring to

FIG. 2

, digital copying machine


200


mainly includes automatic document feeder


500


to turn over the front and back of a document sheet as desired, an image reader IR to read an image from a document and generate image data accordingly, a memory unit portion


230


to temporarily store image data obtained by image reader IR, a printer PRT to print images on a copying sheet based on image data stored in memory unit portion


230


, operation panel


150


to input operations (placed on the top of digital copying machine


200


vertically to the sheet surface of the figure), and an external input/output control portion


250


to exchange data with the outside.




In automatic document feeder


500


, a document at document transport tray


501


is automatically set at a reading position on platen glass


215


from the lowermost document sheet in response to an instruction to print, and when reading by image reader IR is complete, the document is discharged onto a discharge tray


502


.




Image reader IR includes a scanning system


210


and an image signal processing portion


220


. In scanning system


210


, the image of a document sheet set at the reading position is exposed using an exposure lamp


211


attached at a scanner


216


moving under the document. Light reflected from the document passes through a reflecting mirror and a collecting lens


212


, and then input to photoelectric conversion elements


213


and


214


formed of a CCD array or the like. Then, a signal obtained by scanning system


210


is sent to image signal processing portion


220


. In image signal processing portion


220


, image processing such as binarizing, image quality correction, magnification-changing, and image editing. The image data after the image processing is stored in memory unit portion


230


.




Printer PRT includes a printing processing portion


240


, an optical system


260


, an image forming system


270


and a sheet transporting system


280


. Printing processing portion


240


drives optical system


260


based on image data from memory unit


230


. In optical system


260


, semiconductor lasers


261


and


262


emit laser beams based on signals controlled by printing processing portion


240


. These beams are combined by a dichroic mirror


263


, reflected by a polygon mirror rotated by a motor


264


, and the resultant beam is directed to a photoreceptor drum


271


in image forming system


270


through a main lens


266


.




In image forming system


270


, photoreceptor drum


271


is charged with a corona charger


272


, and then irradiated with a laser beam from optical system


260


. Thus, a latent electrostatic image is formed on photoreceptor drum


271


. Then, a developer


273


applies toner on the latent electrostatic image. The toner image on photoreceptor drum


271


is transferred onto a copying sheet fed from a feeding cassette


280




a


or


280




b


in paper feeding system


280


. The sheet is then transported to a fixing device


282


by a sheet transport belt


281


, the toner fixed on the sheet under the heat and pressure, and then the resultant sheet is discharged onto a receiving roller pair


81


at staple sorter


10


(see

FIG. 4

) connected to digital copying machine


200


.




External input/output portion


250


exchanges data between a personal computer connected to the outside, a local area network (LAN) and a public switched telephone network (PSTN) and memory unit


230


. External input/output control portion


250


mainly includes a communication control portion to control communication for exchanging a control signal and image data with the personal computer, a network control portion connected to the LAN to control network for exchanging a control signal and image data with an external device connected to the LAN, a facsimile converting portion to exchange data with memory unit portion


230


and convert image density and coding method in a facsimile operation, and a G


3


unit to control communication such as modulation and demodulation of image data and a control signal in a facsimile operation and connected to a telephone line to control communication with the PSTN.




Referring to

FIG. 3

, operation panel


150


includes a liquid crystal display


156


and a touch panel


151


provided thereon and formed of a transparent member. Liquid crystal display


156


displays the state of a job sheet output to the stack and a discharge bin which will be described, in addition to copying conditions for digital copying machine


200


and its internal state. Touch panel


151


is used to set a copying condition, and the user may input a prescribed operation using the touch panel. Operation panel


150


further includes a numeral keys


152


used to input numerical values such as the number of copies and magnification, a reset key


153


to reset a copying condition set by the user's input, a switch key


154


to switch the image displayed on the screen of liquid crystal display


156


, and a start key


155


to instruct the start of a copying operation.




The internal construction of staple sorter


10


will be now described.




Referring to

FIG. 4

, staple sorter


10


mainly includes a sheet transport device portion


80


, a bin assembly


30


having five stages of discharge bins


311


to


315


(hereinafter as discharge bins


311


to


315


), a staple unit


70


to subject a set of sheets to a stapling process, a take out unit


40


driven by a motor M


70


to present a set of sheets taken from discharge bins


311


to


315


to a sheet set transport gate


100


, a stack


20


, and sheet set transport gate


100


to transport a set of sheets taken from discharge bins


311


to


315


by take out unit


40


onto stack


20


.




Referring to

FIG. 4

, elements such as sheet transport device portion


80


, bin assembly


30


, staple unit


70


and sheet set transport gate


100


will be now particularly described.




Sheet transport device portion


80


includes receiving roller pair


81


to receive sheets discharged from digital copying machine


200


, a first transport portion


83


to transport a sheet virtually vertically, a switch claw


82


to switch the direction of transporting sheets between the sides of first transport portion


83


and sheet set transport gate


100


, and a second transport portion


90


to transport sheets virtually horizontally to the side of bin assembly


30


from first transport portion


83


.




Switch claw


82


can rotate around a spindle


82




a


based on the on and off of a solenoid SL


50


.




When solenoid SL


50


is off, switch claw


82


is set at a position shown in FIG.


4


. At this time, a sheet discharged from digital copying machine


200


and received by receiving pair


81


is guided by the curved, right side surface of switch claw


82


and transported into first transport portion


83


.




When solenoid SL


50


is on, switch claw


82


rotates clockwise from the position shown in FIG.


4


. At this time, a sheet discharged from digital copying machine


200


and received by receiving roller pair


81


is guided by the upper surface of switch claw


82


and a guide plate


79


, and transported onto stack


20


through sheet set transport gate


100


which will be described.




First transport portion


83


includes guide plates


84


to


87


to guide a sheet and transport roller pairs


88


and


89


to transport a sheet, and there is provided a punch unit


75


at an intermediate stage portion to form binding holes at the head or tail end of sheets in the direction of transport. Second transport portion


90


includes transport rollers


91


and


92


to transport sheets, guide plates


93


and


94


to guide sheets. Guide plate


94


is attached at a side plate portion of guide plate


93


and transport roller


91


is mounted at one end of guide plate


94


. Second transport portion


90


can be turned in the direction denoted by arrow a at about 90° around spindle


95


from the position shown in FIG.


4


.




In staple sorter


10


, when sheets are distributed to discharge bins


311


to


315


, second transport portion


90


is at the position shown in

FIG. 4

, and a sheet transported by transport rollers


91


and


92


is transported to the side of bin assembly side


30


. When a set of sheets are taken from discharge bins


311


to


315


and set onto the stack, second transport portion


90


turns around spindle


95


in the direction denoted by arrow a at about 90° and is withdrawn from the sheet transport position.




Second transport portion


90


includes a sensor SE


21


which detects a set of sheets stored/taken out in/from discharge bins


311


to


315


.




Receiving roller pair


81


, transport pairs


88


and


89


, transport rollers


91


and


92


, take out rollers


42


and


43


are rotated through a driving force transmitting portion (not shown) by motor M


50


. Take out rollers


42


and


43


are provided in take out unit


40


, hold a set of sheets taken from discharge bins


311


to


315


and present the set of sheets to gate


100


.




Bin assembly


30


will be now described. Bin assembly


30


is formed the five stages of discharge bins


311


to


315


, which are provided inclined at prescribed intervals. Pins


32


provided at the lower end side of discharge bins


311


to


315


are each engaged with a spiral groove formed at the outer circumferential surface of a driving shaft (not shown) provided in the vertical direction, and the driving shaft is normally/reversely rotated to raise/lower bins


311


to


315


.




Bin assembly


30


is set at its home position in FIG.


4


. At this home position, first discharge bin


311


opposes transport rollers


91


and


92


, while second discharge bin


312


opposes staple unit


70


. Hereinafter, the position of discharge bins


311


to


315


opposing to transport rollers


91


and


92


is referred to as position X


1


, while the position of discharge bins opposing staple unit


70


is referred to as position X


2


.




If the driving shaft is reversely rotated once from the state in which first discharge bin


311


is at position X


1


, first discharge bin


311


is lowered to position X


2


, and second discharge bin


312


is lowered to a position in contact with third discharge bin


313


. When first discharge bin


311


is at position X


2


, a set of sheets on first discharge bin


311


can be bound using staple unit


70


. Once the set of sheets is bound, rotating the driving shaft once in the normal direction causes first discharge bin


311


to rise to position X


1


again and second discharge bin


312


to position X


2


.




There are provided at bin assembly


30


a sensor (not shown) to detect discharge bins


311


to


315


being set at the home position and a sensor (not shown) to detect discharge bins


311


to


315


having been raised for one pitch by one rotation of the driving shaft. Sensors SE


341


to SE


345


to detect the presence/absence of a sheet are attached to discharge bins


311


to


315


.




Staple unit


70


will be now described. Staple unit


70


has a well-known electric construction, and includes a head portion


71


which can attach/detach a cartridge having staples inside and an anvil portion


72


to receive and bend a staple let out from head portion


71


. Staple unit


70


moves to the side of discharge bins


311


to


315


set at position X


2


, and a staple(s) is inserted at one position at a corner of a set of sheets or at two positions at an end of the set of sheets.




More specifically, staple unit


70


can move toward the back side of staple sorter


10


as the front side (the front side in the sheet of the figure) is the home position, stops at a prescribed position, moves to the side of discharge bins


311


to


315


for inserting a staple, and then returns to the home position after inserting the staple. Note that an incision is formed at a position corresponding the insertion of the staple at the lower end of discharge bins


311


to


315


, and the tip end of staple unit


70


may come into the side of discharge bins


311


to


315


.




Sheet set transport gate


100


will be now described. Sheet set transport gate


100


includes a pair of gate rollers


102


and


103


, sheet guide plates


104


and


105


in a box


101


, and rollers


102


and


103


are normally/reversely rotated by a motor M


21


. Sheet set transport gate


100


is raised/lowered as it is guided by a guide member (not shown) and has a motor M


20


as a driving force.




Sheet set transport gate


100


is at its home position in FIG.


4


. At this home position, a sheet guided onto the upper surface of switch claw


82


from receiving roller pair


81


is transported to the left in

FIG. 4

by the rotation of rollers


102


and


103


and transported onto stack


20


.




How a set of sheets on discharge bin


312


is transported onto stack


20


will be now described. Sheet set transport gate


100


can move within staple sorter


10


as shown in

FIGS. 5

to


10


.




Sheet set transport gate is lowered to a position corresponding discharge bin


312


set at position X


1


in order to receive a stapled or non-stapled, sheet set on discharge bin


312


(see FIG.


5


). At this position, sheet set S which has been taken from discharge bin


312


by the movement of take out rollers


42


and


43


in

FIG. 4

is held at sheet set transport gate


100


between rollers


102


and


103


(see FIG.


6


). Sheet set S is taken into sheet set transport gate


100


by normally rotating rollers


102


and


103


(see FIG.


7


).




Once sheet set S is completely taken into sheet set transport gate


100


, the normal rotation of rollers


102


and


103


is stopped, and sheet set transport gate


100


is raised at the same time (see FIG.


8


). Once sheet set transport gate


100


rises to a prescribed level, rollers


102


and


103


reversely rotate to discharge sheet set S held between rollers


102


and


103


onto stack


20


(see FIG.


9


).




Sheet set transport gate


100


is lowered to a transport position opposing to discharge bin


313


raised for


1


pitch and set at position X


1


(see FIG.


10


), and the stacking operation to stack


20


as described above may be repeated.




In order to achieve the stacking operation, as shown in

FIG. 4

, there are provided at the upper part of stack


20


, a sensor SE


33


to detect the presence/absence of a sheet on stack


20


, and a sensor SE


23


to detect the uppermost surface of the sheets on stack


20


(if there is no sheet, the upper surface of stack


20


). There are also provided a sensor SE


20


to detect sheet set transport gate


100


being at the home position and a sensor SE


22


to detect the presence/absence of a set of sheets in sheet set transport gate


100


.




Note that in staple sorter


10


, the stacking operation may be performed in parallel with a staple process to a set of sheets on a discharge bin set at position X


2


.




In the sheet output device having this construction, if discharge bins


311


to


315


are pre-allocated for each of a plurality of users, a job sheet will be output to a discharge bin allocated to a user in response to an instruction from the user to output the job sheet.




Digital copying machine


200


and staple sorter


10


described above are controlled by a control portion shown in FIG.


11


.




Referring to

FIG. 11

, the control portion includes a ROM


171


to store programs to operate staple sorter


10


, a CPU to execute the programs, a RAM


172


to store information necessary for executing the programs, and a CPU


173


to control digital copying machine


200


.




CPU


170


is provided with detection signals from sensor SE


20


to detect sheet set transport gate


100


being at the home position, sensor SE


21


to detect the presence/absence of a set of sheets at second transport portion


90


, a sensor SE


22


to detect the presence/absence of a set of sheets within sheet set transport gate


100


, a sensor SE


23


to detect the uppermost surface of a sheet on stack


20


, a sensor SE


33


to detect the presence/absence of a sheet on stack


20


, and sensors SE


341


to SE


345


to detect the presence/absence of a sheet on discharge bins


311


to


315


, the elements described in conjunction with FIG.


4


.




CPU


170


transmits driving signals to motor M


20


to raise/lower sheet set transport gate


100


, motor M


21


to rotate rollers


102


and


103


in sheet set transport gate


100


, a motor M


50


to drive various rollers in staple sorter


10


, a motor M


60


to drive the driving shaft for raising/lowering discharge bins


311


t


315


, a motor M


70


to drive take out unit


40


, and a solenoid SL


50


to drive switch claw


82


for switching the direction of transporting sheets.




CPU


170


is connected to a timer management portion


175


. Timer management portion


175


manages time for each of discharge bins


311


to


315


by counting time during which each discharge bin has been left behind after a job sheet is output to the discharge bin.




A CPU


173


is connected to image reader IR, memory unit portion


230


, printer PRT, external input/output control portion


250


and operation panel


150


in digital copying machine


200


. CPUs


170


and


173


are connected, a signal to request the start of printing process is transmitted from CPU


170


to CPU


173


, while a signal indicating the end of printing process is transmitted from CPU


173


to


170


, and the timing of printing an image onto a sheet in digital copying machine


200


is adjusted as processing at staple sorter


10


is performed.




RAM


172


stores a discharge bin information management table and a stack information management table.




Referring to

FIG. 12

, items in the discharge bin information management table stored in RAM


172


will be now described. Bins


1


to


5


in the discharge bin information management table correspond to discharge bins


311


to


315


described above (see FIG.


4


). It is detected if a sheet being discharged on discharge bins


311


to


315


by sensors SE


341


to SE


345


, and “present” and “absent” in item “discharged sheet” represent the result of detection.




The item “transported” represents the transport of a job sheet from a discharge bin to the stack. The item “personal identification number” corresponds to bins


1


to


5


, and is pre-registered by input through operation panel


150


. The item “job name” represents the name of a job instructed to be output. The item “output time” represents time at which an output job indicated at the item “job name” is output to discharge bins


311


to


315


. The item “operator's name” represents the name of a person who instructed output of an output job indicated at the item “job name”.




Note that “output time” may be the time at the end of the output of a job sheet to a discharge bin, counted based on the number of job sheets to be output.




Referring to

FIG. 13

, the stack information management table stored in RAM


172


is a management table to indicate whether or not a job sheet which has been transported from discharge bins


311


to


315


is present on the stack, and if any, which discharge bin the job sheet has been transported from. The item “sheet transported from somewhere else” indicates the presence/absence of a job sheet which has been transported from any of discharge bins


311


to


315


, and “present” is indicated if there is a job sheet which has been transported from somewhere, and otherwise “absent” is indicated. The item “from where” indicates which discharge bin a job sheet has transported from, using the number of the discharge bin if there is such a job sheet which has been transported to the stack from any of discharge bins


311


to


315


. Note that if there are a number of job sheets on the stack which have transported from discharge bins


311


to


315


, the number of pieces of data on job sheets (the number of rows) stored in the stack information management table increases.




The process of outputting a sheet performed at the sheet output device according to the present embodiment will be now described.




Referring to

FIG. 14

, when a program is started in response to turning on of a power supply, the sheet output device determines the presence/absence of a printing request in step S


1


. The printing request is obtained through external input/output control portion


250


when an external personal computer is connected. When the user directly operates digital copying machine


200


, such a printing request is detected based on pressing of a start key


155


on operation panel


150


. If there is no printing request (NO in step S


1


), the process is completed, and otherwise (YES in step S


1


), the personal identification number is verified.




If there is an external personal computer connected, and the personal computer provides an output instruction, the personal identification number is acquired from the personal computer. If the operator directly operates digital copying machine


200


, the personal identification number is input from numeral keys


152


on operation panel


150


. The personal identification number is pre-registered in the discharge bin management table. It is determined if the personal identification number obtained from external input/output control portion


250


or operation panel


150


is correct by searching the discharge bin information management table.




If the personal identification number obtained in step S


2


is not in coincidence with a personal identification number stored in the discharge bin information management table (NO instep S


2


), the printing request is cancelled (step S


3


). If there is a printing request from an external personal computer, a cancel signal is transmitted through external input/output control portion


250


, and if the operator directly operates digital copying machine


200


, “not registered personal identification number” is indicated on liquid crystal display


156


at operation panel


150


.




If a personal identification number in coincidence with the personal identification number obtained in step S


2


is registered in the discharge bin information management table (YES in step S


2


), the number of a corresponding discharge bin is obtained, and a “job name”, “output time” and “operator's name” are written in the discharge bin information management table (step S


4


).




If an external personal computer or the like is connected, the “job name” and “operator's name” are those obtained from the personal computer through external input/output control portion


250


, or if the operator directly operates digital copying machine


200


, a “job name” and “operator's name” are input from touch panel


151


at operation panel


150


. If such “job name” and “operator's name” are not available, the writing operation to the discharge bin information management table may be omitted.




The “output time” indicates the time at which a job instructed to be output is output to a discharge bin or the time at which output of a job sheet to a discharge bin ends, counted based on the number of job sheets or the like.




When the discharge bin information management table has been updated, a mode such as copying conditions for copying machine


200


is set and a printing executing command is transmitted, thus starting printing (step S


5


). A sheet printed with data by digital copying machine


200


is transported to staple sorter


10


, at which mail bin process such as discharge to a discharge bin or transport to the stack is performed. Thereafter, the control returns to step S


1


, and the process from steps S


1


to S


6


is repeated.




The mail bin process will be now described. Referring to

FIG. 15

, in the mail bin process, a personal identification number obtained in step S


2


in

FIG. 14 and a

personal identification number in the discharge bin information management table stored in RAM


172


are compared, a discharge bin having a matching personal identification number is selected, and a sheet printed by digital copying machine


200


is output to the selected discharge bin (step S


10


). Then, timer management portion


175


starts a timer corresponding to the selected discharge bin (step S


11


).




Then, the updated content of the discharge bin information management table stored in RAM


172


is displayed on the liquid crystal display portion


156


at operation panel


150


(step S


12


).




Among the timers for discharge bins counting, the presence/absence of a discharge bin having a job sheet left behind for a prescribed time period is determined in timer management portion


175


(step S


13


). If there is no such discharge bin, the corresponding timer of which has passed the prescribed time period, the mail bin process is completed and the control returns to the sheet output process. Otherwise, sheet set transport gate


100


is driven and a job sheet discharged to the discharge bin the corresponding timer of which has passed the prescribed time period is transported to the stack (step S


14


).




As a job sheet output to the discharge bin the corresponding timer of which has passed the prescribed time period is transported to the stack, the discharge bin information management table and stack information management table stored in RAM


172


are updated and displayed at liquid crystal display portion


156


(step S


15


).




Then, based on detection signals from sensors SE


341


to SE


345


, it is determined if a job sheet discharged to discharge bins


311


to


315


has been taken out (step S


16


). If the job sheet has been taken out, a timer corresponding to the discharge bin from which the sheet has been taken out is reset (step S


19


), and then the discharge bin information management table is updated (step S


12


). In the updating at this time, data corresponding to the discharge bin from which the sheet has been taken out is labeled “none” at the item “discharged sheet”, and data at the “job name”, “output time” and “operator's name” is cleared.




If a job sheet discharged to a discharge bin has not been taken out (NO in step S


16


), it is determined if a job sheet on the stack has been taken out based on the output of sensor SE


23


(step S


17


). If a job sheet has been output, the discharge bin information management table and stack information management table are updated, and the content of the discharged discharge bin information management table and stack information management table is displayed at liquid crystal display portion


156


(step S


15


). In the updating of the stack information management table, the data is entirely cleared, and in the updating of the discharge bin information management table, data corresponding to “from where” in the cleared data at the “discharged sheet” is updated into “none”, and data at the “job name”, “output time”, and “operator's name” is cleared.




When a job sheet on a stack has not been taken out (NO in step S


17


), the presence/absence of the next output job is determined (step S


18


). If there is an output job, the control proceeds to step S


10


, and the above-described process is repeated. If there is no output job (NO in step S


18


), the mail bin process is completed, thus returning to the sheet output process.




Herein, an example of display at liquid crystal display portion


156


showing the content of the discharge bin management table and stack management table is given. Referring to

FIG. 16

, for each of the stack and the first to fifth discharge bins, “job name”, “output time”, “operator's name”, “notes” are indicated. For example, according to the indication, a job sheet for a job under the name of “ddd.xls” output by “Yamada” at “12:40” is placed at the stack, and the job sheet has been transported from the fourth discharge bin. Meanwhile, the same content as that displayed for the column of the stack is indicated for “job name”, “output time” and “operator's name”, and “transported to stack” is indicated in “notes”, thus showing “ddd.xls” output to the fourth discharge bin has transported to the stack.




Note that if there are a plurality of pieces of data stored in the stack information management table, a plurality of lines of information are displayed.




As described above, in the sheet output device according to the present invention, what kind of job has been output by who and when is displayed at liquid crystal display portion


156


, and therefore the user may easily know where a job sheet, output of which he/she has instructed, is located. If a job sheet output to a discharge bin is transported to the stack after the elapse of time, for which job the job sheet thus transported to the stack has been output and from which discharge bin the sheet has been transported are displayed at liquid display portion


156


, so that the user can easily know at which discharge bin the job sheet, output of which he/she has instructed, is located.




In the sheet output device as described above, the content of the discharge bin information management table and stack information management table is displayed on operation panel


150


at liquid display device


156


, and a modification of the above will be now described.




First Modification




According to a first modification, immediately before or after the transport of a job sheet from a discharge bin to the stack, the content of the discharge bin information management table and stack information management table shown in

FIG. 16

(hereinafter as “display information”) is printed onto a new sheet by digital copying machine


200


, and the sheet having the printed display information is discharged to the stack.




According to the first modification, the sheets printed with the display information is discharged on the top or bottom of the set of job sheets transported to the stack. As a result, the user may view the sheet printed with display information, discharged to the stack and be easily informed of the location of the job sheet he/she has output.




Second Modification




According to a second modification, when an output instruction is given from an externally connected personal computer or the like, display information is transmitted to the personal computer or the like through external input/output control portion


250


.




Thus, the user who has instructed output through the personal computer may be informed of where a job sheet he/she has thus output by the computer before going to the sheet output device to take out the job sheet.




Third Modification




According to a third modification, an audio sound synthesizing device and an audio sound output device are connected to CPU


173


, and the user is informed of the transport of a job sheet from a discharge bin to the stack by an audio sound.




If for example the content of the discharge bin information management table is as shown in

FIG. 12

, and the content of the stack information management table is as shown in

FIG. 13

, the person who outputs the job, in other words, the operator presses switch key


154


at operation panel


150


in the sheet output device, “the job sheet of Yamada at the fourth discharge bin has been transported to the stack” is output in audio sound.




According to the third modification, the user may press switch key


154


to be informed of which discharge bin a job sheet transported to the stack has been transported from by audio sound, and therefore he/she may know if the job sheet he/she output is located in the stack or a discharge bin by the audio sound.




Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the spirit and scope of the present invention being limited only by the terms of the appended claims.



Claims
  • 1. A sheet output device having a stack for storing sheets and a plurality of discharge bins, comprising:a sheet transport device to transport a sheet from said discharge bin to said stack; a generation device to generate first information showing that the sheet has been transported by said sheet transport device; and an indicator to indicate the first information generated by said generation device to a user.
  • 2. The sheet output device according to claim 1, further comprising, a memory to store information related to a sheet discharged to said discharge bin on a discharge bin basis, whereinsaid indicator also indicates second information related to the sheet transported by said sheet transport device.
  • 3. The sheet output device according to claim 1, wherein said indicator includes a display to display said first information.
  • 4. A sheet output device having a stack for storing sheets and a plurality of discharge bins, comprising:a sheet transport device to transport a sheet from said discharge bin to said stack; and an indicator to indicate first information that the sheet has been transported by said sheet transport device wherein said indicator includes a printer to print said first information.
  • 5. An image forming apparatus having a stack for storing sheets and a plurality of discharge bins, comprising:a sheet transport device to transport a sheet from said discharge bin to said stack; a generation device to generate first information showing that the sheet has been transported by said sheet transport device; and an indicator to indicate the first information generated by said generation device to a user.
  • 6. The image forming apparatus according to claim 5, further comprising a memory to store information related to a sheet discharged to said discharged bin on a discharge bin basis, whereinsaid indicator also indicates second information related to the sheet transported by said sheet transport device.
  • 7. The image forming apparatus according to claim 5, wherein said indicator includes a display to display said first information.
  • 8. An image forming apparatus having a stack for storing sheets and a plurality of discharge bins, comprising:a sheet transport device to transport a sheet from said discharge bin to said stack; and an indicator to indicate first that a sheet has been transported by said sheet transport device, wherein said indicator includes a printer to print said first information.
Priority Claims (1)
Number Date Country Kind
10-287931 Oct 1998 JP
US Referenced Citations (7)
Number Name Date Kind
5328169 Mandel Jul 1994
5362200 Ushirogata Nov 1994
5433325 Levaro et al. Jul 1995
5435544 Mandel Jul 1995
5580039 Takehara et al. Dec 1996
5852764 Kida et al. Dec 1998
5971383 Horikawa et al. Oct 1999
Foreign Referenced Citations (3)
Number Date Country
08133579 May 1996 JP
09295762 Nov 1997 JP
10059605 Mar 1998 JP