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TAKEAWAY-SORT POCKETS CONVEYOR FEEDER FEEDUP TABLE
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GATE SORT SENSOR ENTRY SORT POCKET I FULL SENSOR READ AREA SENSOR DOCUMENT DOUBLES SENSOR FEEDER SENSOR FEED UP TABLE CLUTCHSORT SORT
VELOCITY ENERGIZE, DE-ENERGIZE
SORT POCKET
STATION STATION 2 FULL SERVO
I SENSOR 2 SENSOR SENSOR DRIVE
-DOCUMENT AT FEEDER -""
DOUBLES DETECT
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---DOCUMENT ADVANCE,STOP. START ~ DOCUMENT AT READ STATION -'"
---SORT POCKET 2 FULL -'"
---SORT POCKET I FULL
--- ..
DOCUMENT ENTERS SORT POCKET READER p BUFFER
LOGIC
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p CONTROLLERDOCUMENT AT TAKEAWAY AREA
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RACK "'"DOCUMENT ENTERS SORT POCKET I
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SORT TO SORT POCKET 2 ~
-DOCUMENT REACHES READ STATION
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MAINTEN1NCE PANEL
DOCUMENT NOT AT SORT POCKET OR IS JAMMED
-TRANSPORT MOTION ERROR
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MORE THAN ONE DOCUMENT.:
~SORT POCKET lOR 2
..
I;rOTAL DOCUMENTSI COUNTER
OPERATOR CONTROL PANEL DOCUMENT ADJUSTMENT PANEL
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11SORT CHECK DOUBLES SORT
DOUBLES POCKET
CHECK XPORT CHECK FULL INDICATOR
INDICATOR INDICATOR INDICATOR
INDICATOR-AIDOO.B
Figure 4- 6. Document Sensor System
These sensors provide the signals shown in figure 4- 6 to the BC for sort control, sort pocket full, and paper jam detection.
SCANNING SYSTEM
When the READY switch on the operator control panel is pressed, a logical 1 signal goes to the BC, indicating that the document is at the read station. In normal operation, if no fault conditions exist in the reader and the reader and BC are "on line" to the computer, logic signals are sent from the BC to the reader. The reader turns the read lamp to full bright-ness and initiates command signals for the mirror velocity servo drive system which causes the scan mirror to scan a line of characters.
Light emitted by the lamp is reflected from an illuminating mirror onto the surface of the document being scanned as shown in figure 4-7. The illuminating mirror is attached to the same shaft as the scanning mirror to provide a moving spot of light synchronized to the spot on the document being scanned. The line scarming mirror system drives the mirrors under program commands from the BC. Velocity information is furnished to the mirror velocity servo circuits by a tachometer generator attached to the dc servo motor. Mirror position information is furnished to the BC by a mirror shaft incremental encoder that provides mirror position signals for every 0.048 inch (48 mils) of mirror travel in the document plane.
The line scanning mirror system causes the scanning mirror to sweep forward at a constant velocity of 75 inches per second over the line of characters being scanned. After the line of characters has been scanned and the sweep forward programmed start-stopping coordinate is reached, the mirror comes to a stop, and then sweeps back at a greater velocity to the next programmed flyback or zero mirror stopping coordinate. As the mirror sweeps back, the transport system conveyor belt advances the next line of characters to be scanned to the
read area.
The scanning mirror reflects the image of each character scanned through a 240 mm lens.
The image gathered by the lens is projected through a folded optics path consisting of one mirror, shown in figure 4-7, onto an image plane consisting of 54 plastic lightpipes. The optics path provides a magnification of4. 26. The image. as referenced to the scanned document, is seen on the image plane rotated 90 degrees to the right. A s the scanning mir-ror moves from left to right in the document plane, the projected image moves in a vertical direction from top to bottom.
Each lightpipe in the image plane transmits a portion of the image to a photomultiplier tube.
The photomultiplier tube converts the light and dark image elements into electrical signals for processing by the character recognition system; For reading ANSI..,.OCR-A Size IV
characters (optional) or for other optional character sets of comparable size, a second set of lightpipes and a program- controlled electromechanical shutter is installed which allows the selection of the proper set of lightpipes for reading either Size I or Size IV characters.
LIGHT SOURCE AND MIRRORS
Illumination for the line scanning mirror system is provided by a single 650-watt sun gun type lamp. The read lamp is normally in a half bright state and is only turned up to full bright during reading. The lamp operates at 500 watts to provide required illumination and to increase the life of the lamp. A variac enables adjustment of the lamp supply voltage to compensate for line voltage variations and aging of the lamp. Light emitted by the lamp is
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Figure 4-7. Scanning System
4-13
reflected from an illuminating mirror onto the surface of the document being scanned and the character image is reflected by a scanning mirror, mounted on the same shaft, through a lens.
READ STA TION
The document is scanned on the concave surface at the read area. The surface of the scanning mirror is located at the center of the radius of the read area arc.
LINE SCANNING MIRROR SYSTEM
The line scanning mirror system consists of the following:
Mirror-BC Interface Logic Mirror Control Logic
Mirror Velocity Servomechanism Mirror Velocity Sensing Circuits Mirror Velocity Error Detection Logict Mirror Position Logic
Mirror Fault Logic
A block diagram of the line scanning mirror system is shown in Figure 4-8.
Mirror-BC Interface Logic
The mirror-BC interface logic interfaces four programmed mirror commands from the BC to the mirror control logic. The four commands are Scan Forward, Accelerate Reverse, Zero Mirror, and Stop. These commands to the mirror control logic are inhibited during the initial power on sequence. during autoload sequences. and when the mirror fault logic regis-ters an over-velocity condition. The line scanning mirror system is held in a standard stopped state when the mirror commands are inhibited by the interface logic.
Mirror Control Logic and Mirror Velocity Servomechanism
The mirror control logic, under control of the programmed mirror commands from the BC.
generates the control signals required for mirror motion functions. The Sweep Forward, Flyback Enable, Flyback Accelerate, Flyback Decelerate, and Delayed MNZV (Mirror Near
Zero Velocity) signals are generated and sent to the mirror velocity servomechanism elec-tronics to cause the line scanning mirror system to perform the following mirror motion functions:
Scan Forward Flyback
Zero Mirror
The MNZV and Scan Gate signals are sent to the BC. The Scan Gate signal, originating in an incremental pulse encoder mounted on the mirror shaft assembly, is employed by the BC to clear its mirror coordinate storage location whenever the mirror is outside the 12. 240-inch long read area in the document plane. The MNZV signal is sent to the BC to indicate when a commanded mirror motion has been completed.
'l'CJ122 Models C and D
4-14 48430080 C
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ACCELERATE,REVERS-r. MIRROR zao ..,ROR ACCELERATE REVERSE iiOiiMIRROR
STOP BUFFER CONTROL
INHIBIT MIRROR CONTROLL-=.::o.J:::S~IRRDR LOGIC
CONTROL COMMANDS ER
MIRROR "ITIlIRROR DETECTION
MAI~ FAULT CONTROL cOM- LOGIC
POSITION FORWARD VELOCITY
LOGIC ENCODER PULSES
SCAN RIGHT FORWARD PULSE SENSING
TO LEFT REOtRSt PULSE CIRCUITS
t----ANSI OATA READY
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HANDPRINT DATA READY
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NOTE I: This INPUT grounded in CJI22 Modell E,F,G,H,J and K"
NOTE 2: CJI22 Models C~.nd 0 only •
MHZV SCAN GATE MIRROR VELOCITY SERVOIIECHANISM
MIRROR DRIVE CCMlANO CIRCUIT
FLYBACK ENABLE fU'IIACK
COIIII-FLYBACK ACCELERATE AND D/A WLT'G
FLY BlICK DECELERATE _EFORII
GENERATOR
!Ell!" '''.IIU5 SWEEP COMMAND
IINZV D/A VOLTAGE