Ricoh VT1730 S IMPORTANT SAFETY NOTICES
IMPORTANT SAFETY NOTICES
PREVENTION OF PHYSICAL INJURY
1. Before disassembling or assembling parts of the printer and peripherals,
make sure that the power cord is unplugged.
2. The wall outlet should be near the copier and easily accessible.
3. If any adjustment or operation check has to be made with exterior covers
off or open while the main switch is turned on, keep hands away from
electrified or mechanically driven components.
HEALTH SAFETY CONDITIONS
1. If you get ink in your eyes by accident, try to remove with eye drops or
flush with water as first aid. If unsuccessful, get medical attention.
2. If you ingest ink by accident, induce vomiting by sticking finger down
throat or by giving soapy or strong salty water to drink.
OBSERVANCE OF ELECTRICAL SAFETY STANDARDS
1. The printer and its peripherals must be installed and maintained by a
customer service representative who has completed the training course
on those models.
SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL
1. Dispose of replaced parts in accordance with local regulations.
2. Used ink and master should be disposed of in an environmentally safe
manner and in accordance with local regulations.
SECTION 1
OVERALL MACHINE
INFORMATION
28 February 1993 SPECIFICATION
1. SPECIFICATION
Configuration: Desk top
Master Making Process: Digital
Printing Process: Full automatic one drum stencil system
Image Mode: Line/Photo
Original Type: Sheet
Overall
Information
Original Weight:
Original Size: Max: 216 mm x 356 mm (81/2" x 14")
Paper Size: Max: 216 mm x 356 mm (81/2" x 14")
Paper Weight:
Printing Area: 210 mm x 349.6 mm (8.3" x 13.8") or less
Printing Speed: 70/100/130 cpm (3 settings)
First Print Time:
Leading Edge Margin:
Trailing Edge Margin:
64 g/m2 ∼ 104.7 g/m2 (17.0 lb ∼ 27.9 lb)
Min: 90 mm x 140 mm (31/2" x 51/2")
Min: 90 mm x 140 mm (31/2" x 51/2")
70 g/m2 ∼ 200 g/m2 (18.6 lb ∼ 53.2 lb)
30 seconds ± 2 seconds
5 mm ± 2 mm (0.2" ± 0.08")
1 mm ± 1 mm
Left Side Margin:
Right Side Margin:
Paper Feed Table Capacity: 500 sheets (80 g/m2, 20.0 lb)
Paper Delivery Table Capacity: 500 sheets (80 g/m2, 20.0 lb)
Master Eject Box Capacity: More than15 masters
ADF Original Capacity: 6 sheets or a 0.6 mm height
5 mm ∼ 10 mm (0.2" ∼ 0.4")
5 mm ∼ 10 mm (0.2" ∼ 0.4")
1-1
SPECIFICATION 28 February 1993
Weight: 51 kg (112 lb)
Power Source: 120 V 60 Hz more than 2.4 A (for North
America)
220 V ∼ 240 V 50/60 Hz more than 1.5 A
(for Europe, Asia.)
Power Consumption: Master Making: Less than 0.16 kW
Printing: Less than 0.16 kW
Dimensions:
(W x D x H)
[Stored]692 mm x 612 mm x 440 mm
(26.2" x 24.1" x 17.3")
[Set up] 1050 mm x 612 mm x 440 mm
(41.3" x 24.1" x 17.3")
Pixel Density: 300 dpi
Print Counter: 7 digits
Master Counter: 6 digits
Noise Emission:
(Sound Pressure level*)
*= The measurements are to be
made according to ISO7779,
respectively.
Less than 70 dB
Master Making: 54 dB
Printing: 70 cpm: 62 dB
100 cpm: 64 dB
130 cpm: 68 dB
Optional Equipment: Key Counter, Tape Dispenser
Consumables:
Name Size Remarks
Thermal master Length: 125 m (410 ft)/roll
Width: 240 mm (9.5)
Ink 500 cc/pack Storage Conditions:
Tape for tape maker 35 m (114.8 ft)/roll
Thermal head cleaner Cleaner pen -- 1pc
Replacement felt -- 10 pcs
Cleaner bottle -- 1 pc
255 masters can be made per roll.
Storage Conditions:
--10 ∼ 40°C, 10 ∼ 90% RH
--5 ∼ 40°C, 10 ∼ 90% RH
Clean the thermal head using the
cleaner when 2 master rolls have
been used.
1-2
28 February 1993 PRINTING PROCESS
2. PRINTING PROCESS
2
Overall
Information
1
5
6
1. Master Ejecting: Ejects the used master wrapped around
the drum into the master eject box.
2. Scanning: Scans the original image with the CCD
through the mirror and the lens while
feeding the original.
3. Master Feeding: Converts the image signal read by the
CCD into digital signals and sends them to
the thermal head to plot holes on the
master. The master then wraps around
the drum.
4
3
4. Paper Feeding: Sends paper separately to the drum
section.
5. Printing: Presses the paper fed from the paper feed
section to the drum. This transfers the ink
to the paper through the drum screen and
the master.
6. Paper Delivering: Peels the printed paper with the exit pawls
and air knife, and ejects the paper onto
the paper delivery table.
1-3
MECHANICAL COMPONENT LAYOUT 28 February 1993
3. MECHANICAL COMPONENT LAYOUT
27
26
28
25
29
24
1 2
3 4
5
6 7 8 9
10
11
12
13
14
15
1617181920212223
1. Mirror
2. Original Feed Roller
3. Original Pressure Plate
4. Exposure Lamp
5. Exposure Glass
6. Original Friction Pad
7. Original Pick-up Roller
8. Master Tension Roller
9. Ploten Roller
10. Thermal Head
11. Master Roll
12. Platter Unit
13. Ink Pump
14. Paper Table
15. Paper Feed Roller
16. Friction Pad
17. 2nd Feed Roller
18. Doctor Roller
19. Press Roller
20. Ink Roller
21. Exit Pawl
22. Exit Roller
23. Paper Delivery Table
24. Drum
25. Master Eject Box
26. Master Eject Roller
27. CCD Unit
28. Original Exit Tray
29. Master Eject Unit
1-4
28 February 1993 DRIVE LAYOUT
4. DRIVE LAYOUT
2
1
3
5
4
6
7
8
9
10
11
12
Overall
Information
18
1. Pump Drive Gear
2. Ink Supply Motor
3. Platen Roller Gear
4. Original Feed Motor
5. Original Pick-up Roller
6. Original Feed Roller
7. Drum Drive Gear
8. Upper Master Eject Roller Gear
9. Lower Master Eject Roller Gear
17
16
15
14
10. Master Eject Motor
11. Master Clamper Motor
12. Master Clamper Drive Gear
13. Exit Roller Pulley
14. 2nd Feed Motor
15. Main Motor
16. 2nd Feed Roller Gear
17. Paper Feed Roller Gear
18. Master Feed Motor
13
1-5
ELECTRICAL COMPONENT DESCRIPTION 28 February 1993
5. ELECTRICAL COMPONENT DESCRIPTION
Index No. Name Function
Motors
11 Master Feed Feeds the master to the drum. F-5
38 Pressure Plate Drives the pressure plate. F-6
27
30 2nd Feed Drives the 2nd feed roller. B-7
33 Master Clamper Open and closes the master clamper. B-7
36
24 Master Eject Sends used master into the master eject box. F-6
43 Original Feed Transports the original for scanning. A-3
44 Master Cutter Cuts the master. F-4
47 Ink Supply Drives ink pump to supply ink. B-6
Solenoid
29
Sensors
1
3
13 Feed Jam Timing Determines the paper misfeed check timing. F-7
14 Paper End Detects if the paper is set on the paper table. F-7
15 Registration Detects paper misfeeds. F-7
16 Feed Start Timing Determines the paper feed start timing. F-7
17 Exit Jam Timing Determines the master misfeed check timing. F-8
18 Master Eject Position Detects master eject position of the drum. F-7
25 Drum Master Detects if the master is on the drum. F-8
28 Exit Detects paper misfeeds. F-8
31 Master Eject Detects used master misfeeds. F-6
35 Full Master Detects if the master eject box is full. F-6
37 Pressure Plate H.P. Detects the pressure plate home position. F-6
46
Switches
5 ADF Open Check if the ADF is open. A-3
6 Left Cutter Determines the left limit position of the cutter. F-5
9 Master Cut Starts the cutter motor to cut the master. F-5
20 Scanner Unit Open Checks if the scanner unit is open. F-1
21 Delivery Cover Open Checks if the delivery cover is open. F-1
22 Main Turns the power on or off. B-1
26
Main Drives paper feed, drum, printing and paper
delivery unit components.
Air Knife Rotates the fun to separate the paper from
the drum.
Pressure Release
Solenoid
Master End Detects if the plotter unit runs out of master
Original Registration
(Upper: light receiver,
Lower: light emitter)
Original Set Detects if the original is set on the original
Master Eject Box Checks if the master eject box is set
Releases the press roller to apply printing
pressure.
roll.
Informs the CPU of the original position.
Also, detects original misfeed.
table.
correctly.
P to P
Location
F-2
B-7
B-6
F-4
A-2
A-3
A-3
F-1
1-6
28 February 1993 ELECTRICAL COMPONENT DESCRIPTION
Index No. Name Function
34
45
Printed Circuit Board
4 Lamp Control Controls the power to the exposure lamp. A-2
8 Operation Panel Interfaces the CPU and a operator. B-5
12 Main Controls all machine functions. C-5
19 Power Supply Provides power for all DC components. D-1
23 Main Motor Control Controls the main motor speed. F-2
32
39
40
Counters
7
10
Others
2 Thermal Head Plots the master using heat. E-2
41
42 Exposure Lamp Applies light to the original for exposure. A-2
Master Clamper Detects the master clamper open/close
position.
Right Cutter Determines the right limit position of the
cutter.
Noise Filter Filters electrical noise on the AC power input
lines.
CCD Converts light intensity into an electrical
signal.
A/D Conversion Converts the analog signals into digital
signals.
Print Keeps track of the total number of prints
made.
Master Keeps track of the total number of masters
made.
Paper Feed Clutch Transmits the main motor drive to the paper
feed roller at an appropriate timing.
P to P
Location
F-8
F-5
A-1
A-5
A-4
F-5
F-5
B-6
Overall
Information
The index numbers of the electrical components correspond to the Electrical
Component Layout on the reverse side of the Point To Point Diagram
enclosed with this manual.
1-7
Main Motor
Main PCB
2nd Feed Motor
Counters
OVERALL MACHINE CONTROL 28 February 1993
6. OVERALL MACHINE CONTROL
Power
Supply
PCB
AC POWER
(120V or 220V)
RAM RAM
Noise Filter
PCB
Thermal Head
Gate
Array
Main Switch
+20V
+5V, +12V,
+38V
+5V, +/-12V, +24V,
+38V
CPU
Driver
EPROM
Thermal Head Drive
RAM RAM
Gate
Array
EPROM
Binary Processing Circuit
Gate
Array
A/D
Convert
I/O
Main Control
I/O I/O
Lamp Control
PCB
Programable
Programable
Counter
Counter
CPU
Panel
Controller
RAM
EPROM
Operation
Panel
EPROM
CPU
Programable
EPROM
Feed Control
Sensors
Motor
Controller
Driver
Counter
Motor
Switches
Main Motor
Control PCB
Controller
Solenoid
Clutch
Motors
M M
CCD PCB A/D Conversion PCB
Exposure
Lamp
1-8
This diagram shows the control system
of the machine.
SECTION 2
DETAILED SECTION
DESCRIPTIONS
28 February 1993 MASTER EJECT
1. MASTER EJECT
1.1 OVERALL
[C]
At the end of the printing cycle, the used master remains wrapped around the
drum to prevent the ink on the drum surface from drying. When the Master
Making key is pressed to make a new master, the used master is removed
from the drum.
[B]
[A]
Detailed
Descriptions
The machine checks if the drum is at the master eject position and if the
master is on the drum by the drum master sensor. The master clamper [A]
then opens to eject the master. If there is no master on the drum, the
machine skips the master eject operation and starts the master making
process.
The master eject rollers [B] turn for 0.5 seconds to pick the master’s leading
edge. After closing the master clamper, the drum starts rotating in the slowest
speed (30 rpm). At the same time the master eject rollers turn and feed the
used master into the master eject box [C].
When the drum stops at the master feed position after one and a half turns,
the pressure plate drive motor starts turning to compress the used master in
the master eject box.
2-1
MASTER EJECT 28 February 1993
1.2 MASTER CLAMPER OPEN MECHANISM
[B]
[E]
[A]
[D]
[C]
[G]
[E]
[H]
[F]
The master eject position sensor [A] is used to confirm that the drum is
positioned at the master eject position when the Master Making key is
pressed. Normally, the drum is stopped at this position after every print job. If
the drum is not at this position, the machine first moves the drum to the
master eject position before opening the master clamper.
The master clamper has two springs [B] and a magnet plate [C] to secure the
master’s leading edge in the clamper. The clamper is fixed on the clamper
shaft [D] which has a lever [E] at the rear side.
The clamper motor [F] drives the moving link [G] and pushes up the clamper
lever [E].
The master clamper then lifts the master eject arm [H] to release the master’s
leading edge from the clamper.
2-2
28 February 1993 MASTER EJECT
1.3 MASTER EJECT ROLLER MECHANISM
[B]
[C]
Detailed
Descriptions
[A]
The master eject rollers are driven by the master eject motor [A] through idle
gears. The upper eject roller [B] has paddles to assure the master pick-up.
When the master clamper is opened and the master’s leading edge is
released from the master clamper, the master eject motor turns on for 0.5
seconds to pick up the leading edge.
When the master eject motor is turned off, the master clamper motor turns in
reverse direction to close the master clamper.
The drum then starts turning at the slowest speed (30 rpm). At the same
time, the master eject rollers turn again to feed the master into the master
eject box.
After one turn of the drum, the master eject motor stops.The drum continues
turning for a half turn and stops at the master feed position.
The master eject sensor [C] is used to detect the master eject jams.
2-3
MASTER EJECT 28 February 1993
1.4 PRESSURE PLATE MECHANISM
[A]
[D]
[F]
[E]
[B]
[C]
[E]
[D]
[B]
[E]
The pressure plate motor [A] drives the pressure plate through the drive arm
[B] and the pressure springs [C].
When the master has been ejected into the master eject box, the pressure
plate motor turns until the full master sensor [D] is actuated by the actuator
on the pressure plate [E]. When the full master sensor is actuated, the motor
stops. When master making and cutting are completed, the motor turns in
reverse to return the pressure plate to the home position. When the pressure
plate home position sensor [F] is actuated, the motor stops.
If the full master sensor is not actuated within 2.4 seconds after the pressure
plate motor is activated, the machine stops the motor and the Empty Master
Eject Box indicat or blinks, after the next master making has finished and the
drum is positioned at the master exit position (drum home position).
2-4
28 February 1993 SCANNER AND OPTICS SECTION
2. SCANNER AND OPTICS SECTION
2.1 OVERALL
[B]
[C]
[F]
[E]
[A]
A/D Conversion
PCB
Main PCB
Operation Panel
PCB
[H]
Thermal
Head
[D]
[G]
The first original at the bottom of the stack on the original table is separated
from the other originals by the original pick-up roller [A] and the original
friction pad [B], and is fed onto the exposure glass [C]. The scanning start
when the original is transported 5mm from the scan line. The master plotting
is synchronized with the original feeding.
Detailed
Descriptions
The light of the exposure lamp [D] is reflected from the original and goes to
the CCD [E] through the lens [F]. The reflector [G] counters shadows from the
edges of cut-and-paste originals. A shading plate [H] installed between the
mirror and the lens cuts some of the light to correct uneven light intensity
between the center and both ends of the lamp.
The light is changed to an electrical signal in each element of the CCD. The
analog signals from the CCD are converted into 4-bit digital signals in the A/D
conversion PCB and sent to the main PCB in which each digital data is
converted into 1-bit data. The main PCB holds the 1-bit data for each pixel.
The PCB uses the data to drive the thermal head which burns each pixel
onto the master.
2-5
SCANNER AND OPTICS SECTION 28 February 1993
2.2 ORIGINAL FEED MECHANISM
[D]
34 mm
[B]
13 mm
[A]
[C]
The originals set on the original table are detected by the original set sensor
[A]. A photo-transister [B] in the upper position and a LED [C] in the lower
position organize the original registration sensor.
After the master on the drum is ejected to the master eject box, the original
feed motor (stepper motor) starts rotating to feed the original to the exposure
glass [D]. When the original is transported 13 mm past the original
registration sensor, the original feed motor stops. At this time the original
leading edge is aligned with the CCD scan line on the exposure glass. The
original feed motor starts again synchronizing with the master feed.
The original pick-up roller keeps rotation after the original trailing edge
passes the roller, so if a 2nd original present, it follows directly after the
trailing edge of the 1st original.
After the 1st originals trailing edge is detected and transported 12 mm past
the original registration sensor, the original set sensor checks whether the
next original is present. If no original is detected, after the original trailing
edge passes the original registration sensor, the original is transported further
35 mm (34+1) and fed out. If the next original is detected, the originals are
transported 1 mm further to align the 2nd original leading edge with the scan
line (the 2nd original has been transported total 13 mm from the original
registration sensor), then the original feed motor stops. After printing of the
1st original is completed, the original transport motor starts again for the next
original.
2-6
28 February 1993 SCANNER AND OPTICS SECTION
2.3 ORIGINAL FEED DRIVE MECHANISM
[D]
[A]
[C]
Detailed
Descriptions
[B]
The pick-up roller and the original feed roller are driven by the original feed
motor [A] (stepper motor) through gears.
The original feed roller [B] diameter is a little bit larger than the original
pick-up roller [C], so that a small gap is made between the continuous
originals while being transpoted. A one-way clutch is installed in the pick-up
roller gear [D] to absorb the speed difference between the pick-up roller and
the original transport roller.
2-7
MASTER FEED 28 February 1993
3. MASTER FEED
3.1 OVERALL
[C]
[D]
[A]
[B]
[E]
The master is fed by the platen roller [A] on the thermal head [B]. When the
drum is at the master feed position and the master clamper is opened, the
tension roller [C] is released by the master clamper so that the master’s
leading edge is fed to the master clamper [D]. The leading edge of the master
is clamped by the master clamper, and the master is wrapped around the
drum and cut by the cutter [E] to the desired length.
2-8
28 February 1993 MASTER FEED
3.2 MASTER FEED MECHANISM
[B]
[D]
[C]
[F]
[E]
Detailed
Descriptions
[A]
A stepper motor is used as the master feed motor [A] to drive the platen roller
[B]. The thermal head is pressed against the platen roller by the pressure
springs. The pressure can be released by the pressure release lever [C] for
master roll replenishment.
After the master eject is finished, the drum is stopped at the master feed
position and the master clamper is opened for the new master.
The master’s leading edge is stopped on the guide plate [D] after the last
master cut or after the manual master cut. The master is fed for 23 mm and
stopped once to synchronize with the original feed. The master is fed for a
further 67.5 mm before the master clamper is closed. Since the clamper
closing timing is later than when the master’s leading edge reaches the
clamper, a master buckle [E] is made on the master feed guide. This master
buckle absorbs the shockwave from the master clamping operation.
The drum then turns intermittently in the slowest mode (30 rpm) to wrap the
master around the drum. The intermittent rotation keeps the master backle on
the master feed guide to absorb the shockwave from the wrapping operation.
The tension roller [F] is pressed to the guide plate which gives the tension to
the master during the master wrapping operation.
2-9
MASTER FEED 28 February 1993
3.3 MASTER CLAMPER OPERATION AND TENSION
ROLLER RELEASE MECHANISM
[B]
[C]
[A]
[D]
[C]
[E]
When the master eject is completed, the drum is stopped at the master feed
position. At this time, the clamper motor [A] drives the moving link [B] to open
the master clamper [C].
The friction roller [D] is normally pressed against the master feed guide plate
to give tension to the master during the master wrapping operation. When the
clamper is opened, the clamper pushes the friction roller arms [E] and
releases the friction roller from the guide plate to allow the master to be fed
into the master clamper.
To close the master clamper, the clamper motor turns in reverse direction.
2-10
28 February 1993 MASTER FEED
3.4 CUTTER MECHANISM
[A]
[D]
[H][G]
[E]
Detailed
Descriptions
[I]
[B]
[C]
[F]
After the master making process is finished, the master feed motor turns off
and the cutter motor [A] starts turning.
The cutter motor drives the pulley [B] and the timing belt [C]. The cutter
holder [D] is fixed on the timing belt and has switch actuators [E].
There are two cutter position switches at the front [F] and the rear [G] of the
cutter rail. When the cutter holder actuates one of these switches at the end
of cutter holder drive operation, the cutter motor is turned off.
The inner roller [H] on the shaft of the rotary cutter blade [I] is touching the
cutter rail, so that the cutter blade is rotating while the cutter holder is moving.
After the master cut operation, the drum starts turning again to wrap the
remaining part of the master around the drum. At the same time, the master
is fed another 32.6 mm ready for the next master making.
2-11
PAPER FEED SECTION 28 February 1993
4. PAPER FEED SECTION
4.1 OVERALL
[A]
[C]
[B]
The top sheet of the paper on the paper table is separated by the paper feed
roller [A] and the friction pad [B], and transported to the 2nd feed rollers [C].
The upper and lower 2nd feed rollers transport the sheet to the drum.
The paper feed roller is driven by the main motor, and an independent
stepper motor is used to control the 2nd feed roller. The 2nd feed roller
functions to synchronize the paper feed timing with the image on the drum.
The 2nd feed roller starts rotating after the paper has come into contact with
the rollers and alighned.
2-12
28 February 1993 PAPER FEED SECTION
4.2 PAPER FEED ROLLER MECHANISM
[C]
[D]
Detailed
Descriptions
[A]
[E]
[B]
The paper feed roller [A] is driven by the main motor [B] through gears and a
timing belt.
During the printing cycle, when the feed start timing sensor [C] is actuated by
the actuator on the drum, the electromagnetic clutch [D] is energized to
transmit the main motor rotation to the paper feed roller shaft. The top sheet
of the paper is separated from the paper stack by the friction between the
roller and the friction pad [E], and transported to the 2nd feed roller.
A one-way clutch is installed in the paper feed roller so that after the
electromagnetic clutch is de-energized, it does not disturb paper
transportation.
2-13
PAPER FEED SECTION 28 February 1993
4.3 2ND FEED ROLLER MECHANISM
[A]
[B]
The lower 2nd feed roller [A] is driven by a stepper motor [B]. The main PCB
controls the 2nd feed roller start timing to synchronize the image on the drum
master and the printing paper.
The stepper motor rotation speed is changed according to the printing speed.
Also, by pressing the image position keys on the operation panel, the 2nd
feed timing is changed. If the paper feed timing is delayed, the image is
shifted forward.
After printing paper is caught between the drum and the press roller, the
stepper motor stops.
2-14
28 February 1993 PAPER FEED SECTION
4.4 UPPER 2ND FEED ROLLER RELEASE MECHANISM
[D]
[A]
Detailed
Descriptions
[C]
[B]
After the printing paper is caught between the drum and the press roller, the
upper 2nd feed roller is released from the lower 2nd feed roller. This is to
prevent interference of the 2nd feed rollers while the paper is transported by
the drum and the press roller.
When the cam follower [A] reaches the top of the cam [B] which is installed
on the drum drive gear, the shaft [C] rotates clockwise (as seen from the
operation side) to release the upper 2nd feed roller [D] from the lower 2nd
feed roller.
If no image shifting mode is used (the image position indicator is at the "0"
position), the upper 2nd feed roller is released when the paper is transported
30mm after reaching the press roller. Even if the paper feed timing is fully
delayed (Max. 15 mm), the paper leading edge reaches to the press roller
before the upper 2nd feed roller is released.
2-15
PAPER FEED SECTION 28 February 1993
4.5 PRINTING PRESSURE MECHANISM
[I]
[E]
[G]
[D]
[H]
[B]
[F]
[C]
[A]
While the machine is not in the printing cycle, the solenoid [A] stays off and
the stoppers [B] locks the brackets [C] to keep the press roller [D] away from
the drum.
When the 1st sheet of paper is fed, the solenoid is energized but the brackets
are still locked by the stoppers due to strong tension of the springs [E]. When
the cam followers [F] installed on both sides of the press roller shaft reach the
top of the cams [G] on the front and rear drum flanges, a small clearance is
made between the stoppers and the brackets. The solenoid plunger is pulled
down releasing the stoppers from the brackets. Printing pressure is applied
by tension of the springs when the cam followers reach the bottom of the
cams.
During printing cycle, the solenoid stays on. However, if paper does not reach
the registration sensor [H] at the proper timing (at this time, the cam follower
is on the top of the cam), the solenoid is de-energized to lock the brackets.
The printing pressure is released when the cams push down the cam
followers so that the press roller does not contact the master clamper [I].
2-16
28 February 1993 PAPER FEED SECTION
After printing is finished, the solenoid is de-energized and the stoppers return
by tension of the springs. Before the drum returns to the home position, the
bracket is locked by the stopper again when the cams push down the cam
followers.
Detailed
Descriptions
2-17
PAPER FEED SECTION 28 February 1993
4.6 PAPER TABLE
[G]
[H]
[F]
[A]
[E]
[C]
[B]
[D]
[C]
[B]
[D]
Paper on the paper table is pushed up to contact the paper feed roller by
tension of the springs [A]. When the lever [B] is lowered, the bearing [C] lifts
up the arm [D] to rotate the shaft [E] counterclockwise. The bracket [F]
pushes down the stay [G] and the paper table is lowered. The arm [D] hooks
the bearing [C] to stop the table in the lower position to allow easy paper
setting.
A photo-interrupter [H] is installed under the paper table to detect paper on
the table.
2-18
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