JP4086329B2 - Sheet stacking device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an image forming system. Sheet stacking device In particular, in a multi-function system that performs print output from a plurality of functions such as copying, faxing, and computer, etc., in one machine, binding to a sheet reversing unit that performs reversing and discharging of sheets and a stack of stacked sheets, etc. The present invention relates to an apparatus having a finishing unit for performing the finishing operation.
[0002]
[Prior art]
Conventional , Double In the multi-function system, when processing is started from the bottom page as in the copy mode, the sheet on which the image has been formed is not reversed but is conveyed to the downstream finishing section as it is, and the finishing operation is performed. In the case of processing from the top page (first page) as described above, the sheet on which the image is formed is reversed and then conveyed to the downstream finishing section to perform the finishing operation.
[0003]
[Problems to be solved by the invention]
However, in the image forming system based on the above-described technology, both the sheet reversing unit for performing the sheet reversing operation and the finishing unit for binding the sheet bundle require a very large portion in the conveyance path. However, there is a problem that the size in particular, in the width direction, becomes large.
[0004]
In addition, because there is a sheet reversing part and a finishing part individually, the processing is performed separately, Multiple There is a problem in that current consumption during operation and operation sound increase, and the time required for processing increases, resulting in inefficiency.
[0005]
[Means for Solving the Problems]
In view of the above-described points, the object of the present invention is to reduce current consumption and operation sound during operation and to shorten processing time. Sheet stacking device Is to provide.
[0006]
A sheet stacking apparatus according to the present invention includes a sheet stacking unit that stacks sheets, and a first sheet transport that transports a sheet after image formation and discharges the sheet from the discharge unit onto the sheet stacking unit without reversing the front and back of the sheet. A sheet stacking unit that stores two or more sheets, a sheet binding unit that binds the sheets stored in the sheet storage unit, and a branch from the first sheet conveying unit And a second sheet that reverses the sheet and feeds it to the sheet accumulating means. Sheet A conveying unit, a conveying path between the discharge unit and the sheet accumulating unit, and the second Sheet The sheet reversed by the conveying means and stored in the sheet accumulating means, or after being conveyed to the discharge section by the first sheet conveying means, the sheet passes through the conveyance path from the discharge section without being reversed. A sheet bundle transfer unit configured to transfer the sheet sent to the storage unit in a bundled state from the discharge unit onto the sheet stacking unit through the conveyance path.
[0010]
[Action]
According to the present invention, when discharging a sheet without reversing the front and back of the sheet, and when discharging the sheet bundle after reversing the front and back of the sheet and performing binding, the same discharge unit Can be discharged to the stacking means. As a result, the sheet can be non-reversed and reversed without increasing the size of the apparatus. Also, By providing finishing means in the sheet reversing part so that the sheet reversing operation and the storing of the sheet in the finishing part can be performed in the same operation, compared to when the sheet reversing part and the finishing part are individually provided It is possible to reduce current consumption and operation sound during operation, and to shorten processing time.
[0011]
【Example】
A cross-sectional view of the entire system of one embodiment of the present invention is shown in FIG. This system includes a main body (reader unit 100, printer unit 200), a circulating automatic document feeder (300), and a sheet post-processing device (400).
[0012]
Details are described below.
[0013]
A. Body (100, 200)
In FIG. 1, 100 is an image input device (hereinafter referred to as a reader unit) that converts a document into image data, and 200 has a plurality of types of recording paper cassettes, and outputs image data as a visible image on the recording paper by a print command. An image output device (hereinafter referred to as a printer) 250 is an external device electrically connected to the reader unit 100. The external device has various functions, and includes a fax unit, a file unit, an external storage device connected to the file unit, a computer interface unit for connection to a computer, and a formatter for converting information from the computer into a visible image. And an image memory unit for accumulating information from the reader unit and the reader unit, and temporarily storing information sent from the computer, and a core unit for controlling the above functions (not shown).
[0014]
The configuration and operation of the reader unit 100 and the printer unit 200 will be described with reference to FIG.
[0015]
The originals stacked on the original feeding device (DH, 300) are sequentially conveyed onto the platen glass surface 102 one by one (the operation will be described later). When the document is conveyed to a predetermined position on the glass surface 102, the lamp 103 of the scanner unit is turned on and the scanner unit 104 is moved to irradiate the document. The reflected light of the original is input to the CCD image sensor unit 109 via the mirrors 105, 106, 107 and the lens 108. Then, the reflected light of the original irradiated to the CCD 109 is subjected to an electrical process such as photoelectric conversion, and is subjected to a normal digital process. Thereafter, these signals are input to the printer unit 200.
[0016]
The image signal input to the printer unit 2 is converted into an optical signal modulated by the exposure control unit 201 and irradiates the photoconductor 202. The latent image formed on the photosensitive member 202 by the irradiation light is developed by the developing unit 203. The transfer paper is conveyed from the transfer paper stacking unit 204 or 205 together with the leading edge of the developed image, and the developed image is transferred by the transfer unit 206. The transferred image is fixed on transfer paper by the fixing unit 207 and then discharged from the paper discharge unit 208 to the outside of the apparatus. The transfer paper output from the paper discharge unit 208 is sorted, bound, and the like according to an operation mode designated in advance by the sheet stacker 400.
[0017]
Next, a method for outputting sequentially read images on both sides of one output sheet will be described.
[0018]
After the output sheet fixed by the fixing unit 207 is once transported to the paper discharge unit 208, the transport direction of the sheet is reversed and transported to the re-feeding transfer paper stacking unit 210 via the transport direction switching member 209. . When the next original is prepared, the original image is read in the same manner as in the above process, but the transfer paper is fed from the refeed transfer paper stacking section 210. Two document images can be output on the back side.
[0019]
B. Circulation type automatic document feeder (RDF300)
The document feeder of this embodiment is a circulation type automatic document feeder RDF. As shown in detail in FIG. 2, the RDF 300 is equipped with a stacking tray 310 as a first document tray on which a document bundle S (not shown) is set.
[0020]
Further, the stacking tray 310 is equipped with a feeding unit constituting one part of the document feeding unit. This feeding means includes a half-moon roller 331, a separation and conveyance roller 332, a separation motor SPRMTR (not shown), a registration roller 335, a full belt 336, a belt motor BELTMTR (not shown), and a large conveyance roller. 337, a transport motor FEEDMTR (not shown), a paper discharge roller 340, a flapper 341, a recycle lever 342, a paper feed sensor ENTS, a reverse sensor TRNS, a paper discharge sensor EJTS (all not shown), and the like. ing.
[0021]
Here, the half-moon roller 331 and the separation conveying roller 332 are rotated by a separation motor SPRMTR to separate the originals one by one from the lowermost part of the original bundle S on the stacking tray 310.
[0022]
Further, the registration roller 335 and the entire surface belt 336 convey the original rotated and separated by the belt motor BELTMTR to the exposure position (sheet path c) on the original table glass 102 through the sheet paths a and b. The large conveying roller 337 is rotated by a conveying motor FEEDMTR to convey the document on the platen glass 102 from the sheet path c to the sheet path e. The original conveyed to the sheet path e is returned onto the original bundle S on the stacking tray 310 by the paper discharge roller 340.
[0023]
The recycle lever 342 detects the circulation of the original. When the original feeding is started, the recycle lever 342 is placed on the upper part of the original bundle S, the originals are sequentially fed, and the rear end of the final original is the recycle lever 342. Detects one cycle of the document by dropping by its own weight when exiting.
[0024]
In the document feeding means 300, when a two-sided document is used, the document is once guided from the sheet paths a and b to c, and then the large conveying roller 337 is rotated and the flapper 341 is switched to guide the leading edge of the document to the sheet path d. Subsequently, the registration roller 335 passes the sheet path b, and thereafter, the entire surface belt 336 conveys the document onto the document table glass 101 and stops, thereby reversing the document. That is, the original is reversed along the sheet paths c to d and b.
[0025]
It is possible to count the number of originals by conveying the originals of the original bundle S through the sheet paths ab to c to de until one cycle is detected by the recycle lever 342. I can do it.
[0026]
C. Sheet post-processing device (400)
Next, FIG. 3 shows a sectional view of the sheet stacker. In the drawing, a sheet discharged from the printer is carried in from a sheet carry-in port 403 of the sheet stacker and conveyed by a conveying roller pair 404.
[0027]
A deflector 410 that switches the sheet conveyance direction to the conveyance path II or the conveyance path III is disposed downstream of the conveyance path I passing through the conveyance roller pair 404. One transport path II extends substantially in the horizontal direction, and a discharge roller pair A405 is disposed downstream thereof. The other transport path III extends in the lower right direction, and there is a delivery roller pair A. (407) is disposed, and a stapler 420 is disposed in the vicinity of the end of the transport path III (dotted line portion in the figure). A stapling operation can be performed by rotation of a motor of an electric stapler (not shown).
[0028]
Discharge roller pair A (405 (This sheet discharge roller pair A, the conveyance path I, the conveyance path II, and the deflector 410 constitute a first sheet conveying means) ) On the downstream side of the discharge roller pair B (406 (Discharge part) ), And the upper roller of the discharge roller pair B is disposed in the open / close guide 411. This open / close guide is configured to be opened and closed in the vertical direction by the rotational movement of the cam 415. When opened, the open / close guide is at the position A in the figure, and the bound position is B in the figure. This open / close position can be determined by the microswitch S5. Also, transport path III (Sheet storage means) In the direction opposite to the end of the transport path IV (Conveyance path) This is merged with the transport path II after that. The transport path IV includes a delivery roller pair B (408). (This sheet feeding roller pair B (408), the sheet feeding roller pair A (407) and the conveying path IV constitute a second sheet conveying means) ) Is arranged. The feed roller pair B and the feed roller pair A are configured to be able to open and close between the respective roller pairs by a solenoid (not shown), and when closed, a in the figure, and when opened, in the figure. By moving to the position b, the distance between the rollers can be changed. A sheet stacker tray (412) for stacking sheets in the downstream direction of sheet discharge. (Sheet stacking means) ), And can be moved in the vertical direction according to the stacking of sheets. Below the stacker tray 412, there are a stacker tray lifting motor for driving the stacker tray in the vertical direction, and a shift motor for performing a horizontal shift operation for sorting the sheet bundles stacked on the stacker tray. It is disposed in the stacker tray motor unit 413.
[0029]
In the figure, S1, S2, and S3 are sensors for detecting the presence or absence of sheets and sheet bundles, and S4 is a sensor for detecting the height of the sheet stacking upper surface on the stacker tray.
[0030]
Each transport roller, discharge roller, and feed roller are driven by a drive motor (not shown). The conveyance roller and discharge roller pair A is unidirectionally rotated and rotates in the direction of the arrow in the figure. The discharge roller pair B, the delivery roller pair A, and the delivery roller pair B rotate in the forward and reverse directions, and the direction of the arrow p in the figure is the forward rotation direction.
[0031]
In the vicinity of the stapler 420, a sheet alignment operation can be performed in a direction perpendicular to the sheet conveying direction. In other words, a reference plate that can contact and align with the sheet is provided on the front side, and the alignment plate that can be reciprocated by an alignment motor (not shown) aligns the sheet from the back side to the front side. It is supposed to be.
[0032]
The alignment motor is a stepping motor, and the position of the alignment plate can be accurately controlled by the number of pulses applied to the stepping motor. Further, the position of the home position of the alignment plate (not shown) can be detected by a sensor (not shown), and the position of the alignment plate can be controlled by the number of pulses applied to the alignment plate home sensor and the alignment motor.
[0033]
The presence of the sheet on the stacker tray can be detected by the stacker tray paper presence / absence detection sensor S6.
[0034]
D. Operation unit, display unit (operation / display panel 500)
FIG. 4 shows an arrangement configuration example of the operation / display panel 500 provided in the main body reader unit 100 described above. The operation / display panel includes a key and an LCD display 501 capable of key / display.
[0035]
A copy start key (copy start key) 503 is pressed to start copying. A clear / stop key 504 has a function of a clear key when pressed during standby (standby) and a stop key during copying recording. This clear key is pressed to cancel the set number of copies. Reference numeral 502 denotes a numeric keypad that is pressed when setting the number of copies. A copy density key 505 is pressed when manually adjusting the copy density. Reference numeral 506 denotes an AE key which is pressed when the copy density is automatically adjusted according to the density of the original, or when AE (automatic density adjustment) is canceled and density adjustment is switched to manual. Reference numeral 507 denotes a density display. A cassette selection key 508 is pressed to select an upper cassette, a middle cassette, or a lower paper deck. Further, when a document is placed on the document feeder 300, APS (automatic paper selection) can be selected by this key 508. When APS is selected, a transfer paper cassette having the same size as the original is automatically selected. Reference numeral 509 denotes an equal-magnification key which is pressed when making an equal-size (original size) copy. Reference numeral 511 denotes a zoom key which is pressed when an arbitrary magnification is designated between 64% and 142%. Reference numerals 510 and 512 denote fixed magnification keys, which are pressed when designating reduction / enlargement of a fixed size.
[0036]
Reference numeral 515 denotes a key for selecting an operation mode of the sheet stacker. The discharge mode (staple, sort, group), and a staple mode / sort when a stapler capable of stapling the recorded paper is connected. The mode and folding of the recorded paper (cross section Z shape / cross section V shape) can be selected and canceled.
[0037]
Furthermore, various processes can be set by keys 513 and 514. For example, double-sided mode, binding margin setting, photo mode, multiple processing, page continuous shooting, 2-in-1 mode, and the like.
[0038]
Reference numeral 516 denotes a mode key for selecting a mode such as a copy mode, a fax mode, or a printer mode.
[0039]
Reference numeral 501 denotes an LCD display for displaying various messages, which displays information relating to copying.
[0040]
<< Explanation of overall block diagram >>
FIG. 5 is a block diagram showing the overall configuration of the system. 1 is a reader unit, 2 is a printer unit, 3 is an external device, 900 is a DH (original feeding device), and 1000 is a control unit for a sheet stacker. Data is exchanged by bus or serial communication, etc., and synchronization is achieved. Here, data to be transmitted from the main body to the document feeder includes a paper feed signal that prompts the user to feed a document loaded on the document feeder, a paper discharge signal that prompts the user to eject the document on the platen glass, and the document. In addition, the data to be sent to the sheet stacker from the main body is an image forming mode, a mode for stacking on the sheet stacker, a sheet size to be stacked, a timing signal, and the like. When the operation is performed, data indicating which function of the external device is used is transmitted from the reader unit and the printer unit to the document feeding device and the sheet stacker using communication.
[0041]
The external device 3 is connected to the reader 1 via a cable, and controls the signals and functions of the core unit in the external device 3. The external device 3 includes a fax unit 4 that performs fax transmission / reception, a file unit 5 that converts various types of document information into electrical signals and saves them on a magneto-optical disk, a formatter unit 8 that develops code information from a computer into image information, and a computer A computer interface unit 7 for interfacing with the computer, an image memory unit 9 for accumulating information from the reader unit 1 or temporarily accumulating information sent from the computer, and a core for controlling the above functions Part 10.
[0042]
E. Reader part (1)
FIG. 6 is a circuit block diagram showing a signal processing configuration of the reader unit 1, and the configuration and operation will be described below.
[0043]
The reflected light of the original irradiated to the CCD 109 is photoelectrically converted here and converted into electrical signals of red, green and blue colors. Color information from the CCD 109 is amplified in accordance with the input signal level of the A / D converter 111 by the next amplifiers 110R, 110G, and 110B. The output signal from the A / D converter 111 is input to the shading circuit 112, where the uneven light distribution of the lamp 103 and the uneven sensitivity of the CCD are corrected. A signal from the shading circuit 112 is input to the Y signal generation / color detection circuit 113 and the external I / F switching circuit 119.
[0044]
The Y signal generation / color detection circuit 113 calculates the signal from the shading circuit 112 by the following formula to obtain the Y signal.
[0045]
[Expression 1]
Y = 0.3R + 0.6G + 0.1B
Further, a color detection circuit that separates the R, G, and B signals into seven colors and outputs a signal for each color is provided. An output signal from the Y signal generation / color detection circuit 113 is input to the scaling / repeat circuit 114. Depending on the scanning speed of the scanner unit 104, scaling in the sub-scanning direction is performed, and scaling in the main scanning direction is performed by the scaling circuit / repeat circuit 114. A plurality of identical images can be output by the scaling / repeat circuit 114. The contour / edge emphasis circuit 115 obtains edge emphasis and contour information by emphasizing the high frequency component of the signal from the scaling / repeat circuit 114. The signal from the contour / edge enhancement circuit 115 is input to the marker area determination / contour generation circuit 116 and the patterning / thickening / masking / trimming circuit 117.
[0046]
A marker area determination / contour generation circuit 116 reads a portion of a document written with a marker pen of a specified color, generates marker contour information, and the next patterning / thickening / masking / trimming circuit 117 generates this contour. Thicken, mask or trim from information. Further, patterning is performed by the color detection signal from the Y signal generation / color detection circuit 113.
[0047]
An output signal from the patterning / thickening / masking / trimming circuit 117 is input to the laser driver circuit 118 and converted into a signal for driving the laser. The output signal of the laser driver 118 is input to the printer unit 2 and image formation is performed as a visible image.
[0048]
Next, the external I / F switching circuit 119 that performs I / F with an external device will be described.
[0049]
When the image information is output from the reader unit 1 to the external device 3, the external I / F switching circuit 119 outputs the image information from the patterning / thickening / masking / trimming circuit 117 to the connector 120. When image information from the external device 3 is input to the reader unit 1, the external switching circuit 119 inputs image information from the connector 120 to the Y signal generation / color detection circuit 113.
[0050]
Each image processing described above is performed according to an instruction from the CPU 122, and the area generation circuit 121 generates various timing signals necessary for the image processing based on values set by the CPU 122. Further, communication with the external device 3 is performed using a communication function built in the CPU 122. The SUB / CPU 123 controls the operation unit 124 and communicates with the external apparatus 3 using a communication function built in the SUB / CPU 123.
[0051]
F. Core part (10)
FIG. 7 is a block diagram illustrating a detailed configuration of the core unit 10 described above.
[0052]
The connector 131 of the core unit 10 is connected to the connector 120 of the reader unit 1 by a cable. The connector 131 incorporates four types of signals, and the signal 187 is an 8-bit multilevel video signal. A signal 185 is a control signal for controlling the video signal. The signal 181 communicates with the CPU 122 in the reader unit 1. The signal 182 communicates with the SUB / CPU 123 in the reader unit 1. The signal 181 and the signal 182 are subjected to communication protocol processing by the communication IC 132 and transmit communication information to the CPU 133 via the CPU bus 183.
[0053]
The signal 187 is a bidirectional video signal line, and can receive information from the reader unit 1 by the core unit 10 and output information from the core unit 10 to the reader unit 1.
[0054]
Signal 187 is connected to buffer 140 where it is separated from bidirectional signals into unidirectional signals 188 and 170. A signal 188 is an 8-bit multi-value video signal from the reader unit 1 and is input to the next-stage LUT 141. The LUT 141 converts the image information from the reader unit 1 into a desired value using a lookup table. An output signal 189 from the LUT 141 is input to the binarization circuit 142 or the selector 143. The binarization circuit 142 has a simple binarization function for binarizing the multilevel signal 189 at a fixed slice level, and binarization based on a variable slice level in which the slice level fluctuates from the pixel values around the pixel of interest. Function, and a binarization function by an error diffusion method. The binarized information is converted into a multi-value signal of 00H when it is 0 and FFH when it is 1, and is input to the selector 143 at the next stage. The selector 143 selects the signal from the LUT 141 or the output signal of the binarization circuit 142. An output signal 190 from the selector 143 is input to the selector 144. The selector 144 is a signal obtained by inputting output video signals from the fax unit 4, the file unit 5, the computer interface unit 7, the formatter unit 8, and the image memory unit 9 to the core unit 10 via connectors 135, 136, 137, and 138, respectively. 194 and the output signal 190 of the selector 143 are selected by the instruction of the CPU 133. An output signal 191 from the selector 144 is input to the rotation circuit 145 or the selector 146. The rotation circuit 145 has a function of rotating the input image signal to +90 degrees, −90 degrees, and +180 degrees. The rotation circuit 145 converts the information output from the reader unit 1 into a binary signal by the binarization circuit 142 and then stores the information in the rotation circuit 145 as information from the reader unit 1. Next, in response to an instruction from the CPU 133, the rotation circuit 145 rotates and reads the stored information. The selector 146 selects either the output signal 192 of the rotation circuit 145 or the input signal 191 of the rotation circuit 145, and as the signal 193, the connector 135 with the fax unit 4, the connector 136 with the file unit 5, and the computer interface unit 7, a connector 138 with the formatter unit 8, a connector 139 with the image memory unit 9, and the selector 147.
[0055]
A signal 193 is a synchronous 8-bit unidirectional video bus for transferring image information from the core unit 10 to the fax unit 4, the file unit 5, the computer interface unit 7, the formatter unit 8, and the image memory unit 9. A signal 194 is a synchronous 8-bit unidirectional video bus that transfers image information from the fax unit 4, the file unit 5, the computer interface unit 7, the formatter unit 8, and the image memory unit 9. The video control circuit 134 controls the synchronous bus of the signal 193 and the signal 194, and controls the output signal 186 from the video control circuit 134. In addition, a signal 184 is connected to each of the connectors 135 to 139. A signal 184 is a bidirectional 16-bit CPU bus, and exchanges data commands in an asynchronous manner. Information can be transferred between the fax unit 4, the file unit 5, the computer interface unit 7, the formatter unit 8, the image memory unit 9, and the core unit 10 through the two video buses 193 and 194 and the CPU bus 184 described above.
[0056]
Signals 194 from the fax unit 4, the file unit 5, the computer interface unit 7, the formatter unit 8, and the image memory unit 9 are input to the selector 144 and the selector 147. The selector 144 inputs the signal 194 to the rotation circuit 145 at the next stage according to an instruction from the CPU 133.
[0057]
The selector 147 selects the signal 193 and the signal 194 according to an instruction from the CPU 133. An output signal 195 of the selector 147 is input to the pattern matching 148 and the selector 149. The pattern matching 148 performs pattern matching on the input signal 195 with a predetermined pattern, and outputs a predetermined multi-value signal to the signal line 196 when the pattern matches. If the pattern matching does not match, the input signal 195 is output as the signal 196.
[0058]
The selector 149 selects the signal 195 and the signal 196 according to an instruction from the CPU 133. The output signal 197 of the selector 149 is input to the next stage LUT 150.
[0059]
The LUT 150 converts the input signal 197 according to the characteristics of the printer when outputting image information to the printer unit 2.
[0060]
The selector 151 selects the output signal 198 and the signal 195 of the LUT 150 according to an instruction from the CPU 133. The output signal of the selector 151 is input to the enlargement circuit 152 at the next stage.
[0061]
The enlargement circuit 152 can set the enlargement magnification independently in the X direction and the Y direction according to an instruction from the CPU 133. The enlargement method is a first-order linear interpolation method. An output signal 170 of the enlargement circuit 152 is input to the buffer 140.
[0062]
The signal 170 input to the buffer 140 becomes a bidirectional signal 187 in accordance with an instruction from the CPU 133 and is sent to the printer unit 2 via the connector 131 and printed out.
[0063]
Hereinafter, the flow of signals between the core unit 10 and each unit will be described.
[0064]
[Operation of Core Unit 10 Based on Information of Fax Unit 4]
A case where information is output to the fax unit 4 will be described. The CPU 133 communicates with the CPU 122 of the reader unit 1 via the communication IC 132 and issues a document scan command. The reader unit 1 outputs image information to the connector 120 when the scanner unit 104 scans a document according to this command. The reader unit 1 and the external device 3 are connected by a cable, and information from the reader unit 1 is input to the connector 131 of the core unit 10. The image information input to the connector 131 is input to the buffer 140 through a multi-value 8-bit signal line 187. The buffer circuit 140 inputs the bidirectional signal 187 as a one-way signal to the LUT 141 via the signal line 188 according to an instruction from the CPU. The LUT 141 converts image information from the reader unit 1 into a desired value using a lookup table. For example, it is possible to remove the background of the document. The output signal 189 of the LUT 141 is input to the binarization circuit 142 at the next stage. The binarization circuit 142 converts the 8-bit multilevel signal 189 into a binarized signal. The binarization circuit 142 converts the binarized signal into 00H when the signal is 0 and FFH when the signal is 1, and two multi-value signals. The output signal of the binarization circuit 142 is input to the rotation circuit 145 or the selector 146 via the selector 143 and the selector 144. The output signal 192 of the rotation circuit 145 is also input to the selector 146, and the selector 146 selects either the signal 191 or the signal 192. The selection of the signal is determined by the CPU 133 communicating with the fax unit 4 via the CPU bus 184. An output signal 193 from the selector 146 is sent to the fax unit 4 via the connector 135.
[0065]
Next, a case where information from the fax unit 4 is received will be described.
[0066]
Image information from the fax unit 4 is transmitted to the signal line 194 via the connector 135. The signal 194 is input to the selector 144 and the selector 147. When the image at the time of fax reception is rotated and output to the printer unit 2 according to an instruction from the CPU 133, the rotation circuit 145 rotates the signal 194 input to the selector 144. An output signal 192 from the rotation circuit 145 is input to the pattern matching 148 via the selector 146 and the selector 147.
[0067]
When the image at the time of fax reception is output to the printer 2 as it is according to the instruction of the CPU 133, the signal 194 input to the selector 147 is input to the pattern matching 148.
[0068]
The pattern matching 148 has a function of smoothing rattling of an image when receiving a fax. The pattern-matched signal is input to the LUT 150 via the selector 149. The LUT 150 can change the table of the LUT 150 by the CPU 133 in order to output the fax received image to the printer unit 2 at a desired density. An output signal 198 of the LUT 150 is input to the enlargement circuit 152 via the selector 151. The enlarging circuit 152 performs an enlarging process on an 8-bit multi-value having two values (00H, FFH) by a first-order linear interpolation method. An 8-bit multilevel signal having many values from the enlargement circuit 152 is sent to the reader unit 1 through the buffer 140 and the connector 131. The reader unit 1 inputs this signal to the external I / F switching circuit 119 via the connector 120. The external I / F switching circuit 119 inputs a signal from the fax unit 4 to the Y signal generation / color detection circuit 113. The output signal from the Y signal generation / color detection circuit 113 is processed as described above, and then output to the printer unit 2 to form an image on the output paper.
[0069]
[Operation of Core Unit 10 Based on Information of File Unit 5]
A case where information is output to the file unit 5 will be described.
[0070]
The CPU 133 communicates with the CPU 122 of the reader unit 1 via the communication IC 132 and issues a document scan command. The reader unit 1 outputs image information to the connector 120 when the scanner unit 104 scans a document according to this command. The reader unit 1 and the external device 3 are connected by a cable, and information from the reader unit 1 is input to the connector 131 of the core unit 10. The image information input to the connector 131 becomes a one-way signal 188 by the buffer 140. A signal 188 which is a multi-value 8-bit signal is converted into a desired signal by the LUT 141. The output signal 189 of the LUT 141 is input to the connector 136 via the selector 143, the selector 144, and the selector 146.
[0071]
That is, the 8-bit multi-value is transferred to the file unit 5 without using the functions of the binarization circuit 142 and the rotation circuit 145. When the binarized signal is filed by communication with the file unit 5 via the CPU bus 184 of the CPU 133, the functions of the binarization circuit 142 and the rotation circuit 145 are used. Since the binarization process and the rotation process are the same as in the case of the above-described fax, they are omitted.
[0072]
Next, a case where information from the file unit 5 is received will be described.
[0073]
Image information from the file unit 5 is input to the selector 144 or the selector 147 as a signal 194 via the connector 136. In the case of 8-bit multi-value filing, it is possible to input to the selector 147, and in the case of binary filing, it can be input to the selector 144 or 147. In the case of binary filing, the description is omitted because it is the same processing as the fax.
[0074]
In the case of multi-value filing, an output signal 195 from the selector 147 is input to the LUT 150 via the selector 149. The LUT 150 creates a look-up table in accordance with an instruction from the CPU 133 in accordance with a desired print density. An output signal 198 from the LUT 150 is input to the enlargement circuit 152 via the selector 151. The 8-bit multilevel signal 170 expanded to a desired enlargement ratio by the enlargement circuit 152 is sent to the reader unit 1 via the buffer 140 and the connector 131. The information of the file part sent to the reader unit 1 is output to the printer unit 2 and image formation is performed on the output paper, similarly to the above-described fax.
[0075]
[Operation of Core Unit 10 Based on Information of Computer Interface Unit 7]
The computer interface unit 7 performs an interface with a computer connected to the external device 3. The computer interface unit 7 includes a plurality of interfaces for communicating with SCSI, RS232C, and Centronics. The computer interface unit 7 has the above three types of interfaces, and information from each interface is sent to the CPU 133 via the connector 137 and the data bus 184. The CPU 133 performs various controls based on the sent contents.
[0076]
[Operation of Core Unit 10 Based on Information of Formatter Unit 8]
The formatter unit 8 has a function of developing command data such as a document file sent from the computer interface unit 7 described above into image data. When the CPU 133 determines that the data sent from the computer interface unit 7 via the data bus 184 is data related to the formatter unit 8, the CPU 133 transfers the data to the formatter unit 8 via the connector 138. The formatter unit 8 develops the transferred data in the memory as a meaningful image such as a character or a figure.
[0077]
Next, a procedure for receiving information from the formatter unit 8 and forming an image on output paper will be described. Image information from the formatter unit 8 is transmitted as a multi-value signal having two values (00H, FFH) to the signal line 194 via the connector 138. The signal 194 is input to the selector 144 and the selector 147. The selectors 144 and 147 are controlled by an instruction from the CPU 133. Hereinafter, the description is omitted because it is the same as the case of the above-described fax.
[0078]
[Operation of Core Unit 10 Based on Information of Image Memory Unit 9]
A case where information is output to the image memory unit 9 will be described.
[0079]
The CPU 133 communicates with the CPU 122 of the reader unit 1 via the communication IC 132 and issues a document scan command. The reader unit 1 outputs image information to the connector 120 when the scanner unit 104 scans a document according to this command. The reader unit 1 and the external device 3 are connected by a cable, and information from the reader unit 1 is input to the connector 131 of the core unit 10. The image information input to the connector 131 is sent to the LUT 141 via the multi-value 8-bit signal line 187 and the buffer 140. The output signal 189 of the LUT 141 transfers multi-value image information to the image memory unit 9 via the selectors 143, 144, 146 and the connector 139. Image information stored in the image memory unit 9 is sent to the CPU 133 via the CPU bus 184 of the connector 139. The CPU 133 transfers the data sent from the image memory unit 9 to the computer interface unit 7 described above. The computer interface unit 7 transfers the data to the computer using a desired interface among the above-described three types of interfaces (SCSI, RS232C, Centronics).
[0080]
Next, a case where information from the image memory unit 9 is received will be described.
[0081]
First, image information is sent from the computer to the core unit 10 via the computer interface unit 7. When the CPU 133 of the core unit 10 determines that the data sent from the computer interface unit 7 via the CPU bus 184 is data related to the image memory unit 9, the CPU 133 transfers the data to the image memory unit 9 via the connector 139. Next, the image memory unit 9 transmits an 8-bit multilevel signal 194 to the selector 144 and the selector 147 via the connector 139. An output signal from the selector 144 or the selector 147 is output to the printer unit 2 in accordance with an instruction from the CPU 133, and an image is formed on the output paper in the same manner as the above-described fax.
[0082]
G. RDF controller (900)
FIG. 8 is a block diagram showing a circuit configuration of the control device (900) of the circulation type automatic document feeder (RDF) 300 according to this embodiment. The control device 900 includes a central processing unit (CPU) 901, a read only memory (ROM) 902, a random access memory (RAM) 903, an output port 904, an input port 905, and the like, and a control program is stored in the ROM 902. The RAM 903 stores input data and work data. Also, the output port 904 is connected to various motors such as the separation motor described above and solenoid driving means, the input port 905 is connected to a paper feed sensor and the like, and the CPU 901 is connected via a bus according to a control program stored in the ROM 902. Control each part. The CPU 901 has a serial interface function, performs serial communication with the CPU of the reader unit, and exchanges control data with the reader unit. The data transmitted from the DH to the reader unit is a paper feed completion signal indicating completion of paper feeding on the platen glass.
[0083]
H. Sorter control device (1000)
FIG. 9 is a block diagram illustrating a circuit configuration of a sheet post-processing apparatus: sheet stacker control apparatus (1000) according to the present exemplary embodiment. The control device 1000 includes a central processing unit (CPU) 1001, a read only memory (ROM) 1002, a random access memory (RAM) 1003, an output port 1004, an input port 1005, and the like, and a control program is stored in the ROM 1002. The RAM 1003 stores input data and work data. The output port 1004 is connected to the above-described various motors such as the conveyance motor and the output motor, solenoids, and the like. The input port 1005 is connected to each sensor and switch S1 to S6 such as a path sensor, and the CPU 1001 is stored in the ROM 1002. Each unit connected via the bus is controlled according to the control program. Further, the CPU 1001 has a serial interface function, performs serial communication with the CPU of the printer, and controls each unit by a signal from the printer unit.
[0084]
The control flow of the sheet stacker in the embodiment of the present invention will be described with reference to the flowcharts of FIGS. 12 to 21 and FIGS.
[0085]
Since the operations of the reader unit, the printer unit, the external device unit, and the document conveying device unit are not related to the present invention, a detailed description of their control methods is omitted.
[0086]
[mode]
First, in FIG. 12, the mode process which is the entire process of the present embodiment will be described. In step 101, it is determined whether or not there is a “sorter start signal” indicating that sheet discharge from the copying machine main body is started. If yes, the process proceeds to step 600. When there is no “sorter start signal” at step 101, a stacking state monitoring process (described later) of step 700 is performed, and then the process returns to step 101.
[0087]
In step 600, it is determined whether or not a reversing operation is involved when a sheet output from the printer is discharged. Details will be described later. After step 600, at step 103, based on the result of step 600, control separation processing by reverse discharge is performed. That is, the process proceeds to step 105 when the reverse discharge operation is performed, and to step 107 when the reverse discharge operation is not performed. In step 105, it is determined whether or not stapling is performed when the sheet is discharged. If stapling is not performed, the non-staple storing process 1 of step 200 is performed, and if stapling is performed, the stapling storing process 1 of step 300 is performed. Similarly, in step 107, it is determined whether or not stapling is performed when the sheet is discharged. If stapling is not performed, the non-staple storing process 2 of step 400 is performed, and if stapling is performed, the stapling storing process 2 of step 500 is performed.
[0088]
As described above, the non-staple storage processing 1 and 2 and the staple storage processing 1 and 2 are all the stacking processing of sheets on the stacker tray. There are four types of processing.
[0089]
Then, upon completion of the non-staple storage processes 1 and 2 and the staple processes 1 and 2, the process is returned to step 101.
[0090]
[Non-staple storage processing 1] (see FIG. 10A)
Next, the operation of the non-staple storage process 1 will be described with reference to FIG. First, in step 201, it is determined whether or not sheets are already stacked on the stacker tray 412. Only when the sheets are not stacked, in step 203, the height of the stacker tray and the front / rear position which is the horizontal shift position are determined for sheet stacking. Set the position. Next, in order to convey and stack the sheet 430, the open / close guide 411 is closed, and the conveyance motor and the discharge motors A and B are turned on. At this time, the discharge roller pair B406 is rotated so that the rotation direction is the normal rotation direction. Then, in order to select II as the sheet transport path, the solenoid that drives the deflector 410 is turned off. In this manner, the conveyance path II is selected by turning off the deflector solenoid, and the conveyance path III is selected by turning on the deflector solenoid.
[0091]
Then, in step 209, it is determined whether or not the path sensor S1 is turned on. If the path sensor S1 is turned on, the process proceeds to step 211. If it is turned off, the process proceeds to step 221. Next, whether the path sensor S2 is turned on or off is checked (step 211, step 213). When the path sensor S2 is turned off, the sheet is transported by 70 mm at step 215, and the stored number count process of step 800 (described later) and the overload monitoring process of step 900 (described later) are performed. 70 mm of step 215 is a distance from the path sensor S2 to the stacker tray 412, and stacking to the stacker tray is performed after conveying this distance. In step 217, it is determined whether or not a horizontal shift operation for sorting sheets on the stacker tray is performed. If so, a stacker tray shift operation is performed (step 217, step 219). In step 221, the presence / absence of a sorter start signal is determined. If there is a sorter start signal, the process returns to step 209. If not, the conveyance motor, the discharge motors A and B, and the deflector solenoid are turned off in step 223, and the process ends.
[0092]
[Stapling storage process 1]
Next, the operation of the above-described staple storage processing 1 will be described with reference to FIG. First, in step 301, it is determined whether or not sheets are already stacked on the stacker tray 412, and only in the case where the sheets are not stacked, in step 303, the height of the stacker tray and the front and rear positions which are horizontal shift positions are determined for the sheet stacking. Set the position. Next, in order to convey and stack the sheet 430, the opening / closing guide 411 is opened, and the conveyance motor and the discharge motors A and B are turned on. At this time, the discharge roller pair B406 is rotated so that the rotation direction is the reverse direction. Further, in order to send the conveyed sheet to the conveyance path III, the pair of delivery rollers A, B407, and 408 are turned on in the reverse direction, and the gap between the rollers is released (step 306). Then, in order to select II as the sheet conveyance path, the solenoid that drives the deflector 410 is turned off (step 307).
[0093]
In step 309, it is determined whether or not the path sensor S1 is turned on. If the path sensor S1 is on, the process proceeds to step 311. If the path sensor S1 is off, the process proceeds to step 321. Next, on / off of the path sensor S2 is checked (step 311 and step 313). When the path sensor S2 is off, the alignment plate is moved to the retracted position in order to perform the sheet alignment operation in step 314 (see FIG. 10B). Then, it is transported by 50 mm at step 315 and waits for 750 ms at step 316. The sheet enters the conveyance path III by the sheet conveyance and the free fall in the obliquely downward direction, and is stacked at the staple position. This operation is completed in steps 215 and 216. Subsequently, a process for counting the number of stored sheets in step 800 (described later) and a stacking over monitoring process (described later) in step 900 are performed, and sheet alignment is performed in step 325. In step 327, it is determined whether or not stapling is performed after the sheet is stored. Bunch Out processing (step 1000: described later) is performed (see FIG. 10C). In step 317, it is determined whether or not a horizontal shift operation for sorting sheets on the stacker tray is performed. If so, a stacker tray shift operation is performed (step 317, step 319). In step 321, the presence / absence of a sorter start signal is determined. If yes, the process returns to step 309. If not, the conveyance motor, the discharge motors A and B, the pair of delivery rollers A and B, and the deflector solenoid are turned off in step 323. finish.
[0094]
[Non-staple storage process 2]
Next, the operation of the non-staple storage process 2 will be described with reference to FIG. First, in step 401, it is determined whether or not sheets are already stacked on the stacker tray 412. Only in the case where the sheets are not stacked, in step 403, the height of the stacker tray and the front and rear positions which are horizontal shift positions are determined for the sheet stacking. Set the position. Next, in order to convey and stack the sheet 430, the open / close guide 411 is closed, and the conveyance motor and the discharge motors A and B are turned on. At this time, the discharge roller pair B406 is rotated so that the rotation direction is the normal rotation direction. Further, in order to send the conveyed sheet to the conveyance path III, the delivery roller pair A407 is turned on in the reverse direction, and the gap between the rollers is closed (step 406). Then, in order to select III as the sheet conveyance path, the solenoid that drives the deflector 410 is turned on (step 407).
[0095]
Then, in step 409, it is determined whether the path sensor S1 is turned on. If the path sensor S1 is turned on, the process proceeds to step 411. If the path sensor S1 is turned off, the process proceeds to step 421. Next, the system waits for the path sensor S3 to be turned on (step 411), and after being turned on, transports 50 mm and turns on the feed roller pair A in the forward direction (step 425). Thereby, the reversing operation of the switchback system of the seat is performed (see FIGS. 11A and 11B). Here, the sheet conveyance is set to 50 mm. However, since this is the distance through which the trailing edge of the sheet 430 passes through the deflector, it may be changed depending on the size or the like. Next, in step 413, the process waits for the path sensor S3 to turn off, and then transports 300 mm, and performs step 800 count processing (described later) and step 900 overload monitoring processing (described later). Then, in preparation for the next sheet conveyance, the feed roller pair A is turned on in the reverse direction (step 427). In step S417, it is determined whether or not a horizontal shift operation for sorting sheets on the stack tray is performed. If so, a stacker tray shift operation is performed (step 417 and step 419). In step 421, the presence / absence of a sorter start signal is determined. If there is a sorter start signal, the process returns to step 409. The process ends.
[0096]
[Stapling storage process 2]
Next, the operation of the above-described staple storage process 2 will be described with reference to FIG. First, in step 501, it is determined whether sheets are already stacked on the stacker tray 412. Only in the case where the sheets are not stacked, in step 503, the height of the stacker tray and the front / rear position that is the horizontal shift position are determined for sheet stacking. Set the position. Next, in order to convey and stack the sheet 430, the open / close guide 411 is closed, and the conveyance motor and the discharge motors A and B are turned on. At this time, the discharge roller pair B is rotated so that the rotation direction is the normal rotation direction. Further, in order to send the conveyed sheet to the conveyance path III, the pair of delivery rollers A and B are turned on in the reverse direction to open the gap between the rollers (step 506). Then, in order to select III as the sheet conveyance path, the solenoid that drives the deflector 410 is turned on (step 507).
[0097]
Then, in step 509, it is determined whether the path sensor S1 is turned on. If it is on, the process proceeds to step 511. If it is off, the process proceeds to step 521. Next, the path sensor 3 is awaited to be turned on (step 511). When the path sensor 3 is turned on, the alignment plate is moved to the retracted position in order to perform the sheet alignment operation at step 514. At step 516, a 250 ms wait is performed. The sheet passes through the transport path III by sheet transport and free fall in the diagonal direction. (Sheet storage means) And is loaded at the staple position, and this operation is completed at step 516 (see FIG. 11C). Subsequently, a process for counting the number of stored sheets in step 800 (described later) and an overload monitoring process in step 900 (described later) are performed, and sheet alignment is performed in step 525. In step 527, it is determined whether or not stapling is performed after the sheet is stored. If stapling is performed, a staple bundle discharge process (step 1000: described later) is performed. Then, in step 517, it is determined whether or not a horizontal shift operation for sorting sheets on the stacker tray is performed. If so, a stacker tray shift operation is performed (steps 517 and 519). In step 521, the presence / absence of a sorter start signal is determined. If yes, the process returns to step 509. If not, step 523 turns off the conveyance motor, discharge motors A and B, feed roller pairs A and B, and the deflector solenoid. finish.
[0098]
[Reverse discharge judgment processing]
Next, the operation of the above-described reverse discharge determination process will be described with reference to FIG. First, in step 601, the operation mode when the sheet is discharged from the printer is determined (step 601). In the copy mode, the reverse discharge is not performed, so the “reverse discharge flag” indicating that the reverse discharge is performed is reset ( In step 603), in the case of FAX / printer operation, reverse discharge is performed, so the "reverse discharge flag" is set (step 605), and the process ends.
[0099]
[Loading status monitoring process]
Next, the operation of the above-described loading state monitoring process will be described with reference to FIG. First, at step 705, the sensor S6 on the stacker tray 412 is used to determine whether or not sheets are stacked on the stacker tray. If no sheets are stacked, the stacking number counter: N is cleared (step 707). .
[0100]
[Storage count processing]
Next, with reference to FIG. 19, the operation of the above-described stored sheet count process will be described. In step 801, the stored number counter is incremented by one.
[0101]
[Overload monitoring process]
Next, the operation of the above-described overload monitoring process will be described with reference to FIG. In step 903, it is determined whether the number of stacked sheets counter: N exceeds a preset upper limit number of stacked sheets: Nlmt1.
[0102]
[Staple bundle discharging process] (see FIG. 10C)
Next, the operation of the staple bundle discharging process will be described with reference to FIG. First, in order to staple the sheet bundle at step 1001, the discharge roller pair B406 and the feed roller pairs A, B407, and 408 are stopped, the open / close guide 411 is closed, and the gap between the feed roller pairs A and B is closed. Next, in step 1003 and step 1005, a stapling operation is performed on the sheet bundle 440. After completion, the discharge motor B and the pair of delivery rollers A and B are turned on in the normal rotation direction, and the sheet bundle is conveyed (step 1007). Then, after the pass sensor S3 is turned off, the sheet is conveyed 300 mm, and the discharge of the sheet bundle is completed (steps 1008 and 1009). If it is not the reverse discharge mode, the opening / closing guide is opened in preparation for carrying in the next sheet (steps 1011 and 1013). Then, in preparation for carrying in the next sheet, a pair of delivery rollers A and B (Sheet bundle transfer means) Is opened, the discharge motor B and the pair of delivery rollers A and B are turned on in the reverse direction (step 1015), and the process is terminated.
[0103]
【The invention's effect】
As described above, according to the present invention, the first sheet conveying unit that discharges the sheet from the discharge unit onto the sheet stacking unit without reversing the front and the back of the sheet, and the first sheet unloading unit are branched from the first sheet conveying unit. A second conveying unit that feeds the leading end of the sheet toward the sheet binding unit, and a sheet stored in the sheet accumulating unit, with the trailing end of the sheet fed by the second conveying unit as a leading end. Since the sheet bundle transfer means is provided to transfer the sheet from the discharge unit onto the sheet stacking means in the bundle state, the sheet is discharged without reversing the front and back of the sheet, and the front and back of the sheet are reversed and the binding is performed. In any case where the sheet bundle is discharged after that, it is possible to discharge from the same discharge unit to the same stacking means, and non-reverse discharge and reverse discharge of sheets without increasing the size of the apparatus. It is possible to provide a capable sheet stacking apparatus. Also, the finishing means is provided in the sheet reversing part, so that the sheet reversing operation and the storing of the sheet in the finishing part can be performed in the same operation, so that the sheet reversing part and the finishing part are provided individually. It is possible to provide a sheet stacking apparatus capable of reducing current consumption and operation sound during operation and reducing processing time.
[Brief description of the drawings]
FIG. 1 is a system cross-sectional view showing the overall configuration of an embodiment.
FIG. 2 is a cross-sectional view illustrating a configuration of an original conveying apparatus according to an embodiment.
FIG. 3 is a cross-sectional view illustrating a configuration of a sheet stacker according to an embodiment.
FIG. 4 is a diagram illustrating an operation unit / display unit according to the embodiment.
FIG. 5 is a block diagram illustrating the entire system of the embodiment.
FIG. 6 is a block diagram illustrating a reader unit according to the embodiment.
FIG. 7 is a block diagram illustrating a core unit of the embodiment.
FIG. 8 is a block diagram illustrating a control unit of the document conveying device according to the embodiment.
FIG. 9 is a block diagram illustrating a control unit of the sheet stacker according to the embodiment.
FIG. 10 is an explanatory diagram showing an operation state of the embodiment.
FIG. 11 is an explanatory diagram showing an operation state of the embodiment.
FIG. 12 is a flowchart showing control of the embodiment.
FIG. 13 is a flowchart showing control of the embodiment.
FIG. 14 is a flowchart showing control of the embodiment.
FIG. 15 is a flowchart showing control of the embodiment.
FIG. 16 is a flowchart showing the control of the embodiment.
FIG. 17 is a flowchart showing control of the embodiment.
FIG. 18 is a flowchart showing the control of the embodiment.
FIG. 19 is a flowchart showing control of the embodiment.
FIG. 20 is a flowchart showing the control of the embodiment.
FIG. 21 is a flowchart showing the control of the embodiment.
[Explanation of symbols]
100 Reader section
102 Platen glass
104 Scanner unit
109 CCD image sensor
200 Printer section
201 Exposure control unit
202 photoconductor
203 Developer
204, 205 Transfer paper stacking section
206 Transfer section
207 Fixing part
208 Paper discharge unit
209 Transport direction switching member
210 Transfer paper stacking section for refeeding
250 External device
300 Document feeder (circular document feeder)
310 Loading tray
332 Separation transport roller
335 Registration Roller
336 Full Belt
337 Large transfer roller
340 Paper discharge roller
341 Flapper
342 Recycle lever
400 sheet post-processing device
403 Sheet entrance
404 Conveying roller pair
405 discharge roller pair A
406 Discharge roller pair B
407 Feed roller pair A
408 Feed roller pair B
410 Deflector
411 Opening and closing guide
412 Sheet stacker tray
415 cam
500 Operation / display panel
501 LCD display
503 Copy start key
504 Clear / Stop key
516 Mode selection key
S1, S2, S3, S4, S6 sensors
S5 Micro switch

Claims (1)

In a sheet stacking apparatus, comprising: a sheet stacking unit that stacks sheets; and a first sheet transport unit that transports a sheet after image formation and discharges the sheet from the discharge unit onto the sheet stacking unit without reversing the front and back of the sheet ,
Sheet storage means for storing two or more sheets;
Sheet binding means for binding sheets stored in the sheet storage means;
Provided branched from the first sheet conveying means, and second sheet conveying means for inverting the sheet fed to the sheet storage means,
A conveyance path between the discharge unit and the sheet storage unit;
The sheet reversed by the second sheet conveying means and stored in the sheet accumulating means, or after being conveyed to the discharge section by the first sheet conveying means, the conveying path from the discharge section without being reversed. A sheet bundle conveying unit that conveys the sheet fed to the sheet accumulating unit through the conveying path from the discharge unit onto the sheet stacking unit in a bundle state. Sheet stacking device.

Images