Universal WPNP-400NI-PIDS User manual

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OWNER’S MANUAL
NON-POROUS
WPNP-400NI-PIDS, WPNP-400NI-T-PIDS,
WPNP-400NI-PIDS-D & WPNP-400NI-T-PIDS-D
WEB PRINTERS
INSTALLATION - OPERATION - MAINTENANCE
STENCILING & MARKING SYSTEMS
WPNP-PD-22119
UNIVERSAL STENCILING & MARKING SYSTEMS, INC.
P.O. BOX 871 - ST. PETERSBURG, FLORIDA 33731 USA
PH: [phone] - E-Mail: [email protected]
Website: www.universal-marking.com

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UNIVERSALproductsaremanufacturedtoexactingstandardsandeveryavailablestephasbeentakentoassure
your complete satisfaction. It is most important, however, that the instructions contained in this manual are read
and carefully followed for best results. Failure to do so may result in unsatisfactory performance, damage to the
equipment and personal injury.
IMPORTANT NOTE
- LIMITED WARRANTY -
UNIVERSALWPNP-400NI-PIDSDigitalWebPrintersareguaranteedtobefreefromdefectsinmaterialsandworkmanship
foraperiodof90 days from thedateofpurchase. Componentsfoundto be defective duringthistimewillberepaired free of
charge if returned to the factory. Damage resulting from use of improper inks, improper installation, or operation is not
coveredunder the scopeofthis warranty. For warranty serviceplease contact our CustomerServiceDepartment.
PREFACE
SPECIFICATIONS
WPNP-400NI-PIDS&WPNP-400NI-T-PIDS
WPNP-400NI-PIDS-D & WPNP-400NI-T-PIDS-D
Printing Dies
XFNeopreneInkRolls
QUICK START
InstallingthePrinter
Preparing the Printer for installation of the Ink Roll
Preparing the Ink Roll for installation
InstallingtheInkRoll
Reinstalling the Inking System on the Printer
Installing the Printing Dies
Inking System PositionAdjusting Knobs
Pre-InkingtheXFNeopreneInk Roll
BASIC PRINCIPLES OF OPERATION
The Pids System
Pids-Digital-CE Programmable Ink Delivery Systems
WPNP Web Printer Interval Timer Setting
Endcoder Sensory Assembly
Installation orAdjustment of the Inductive Proximity Sensor
MAINTENANCE
Cleaning the Printer
Cleaning the Transfer Roll
Cleaning the Printing Dies
PARTS DIAGRAMS & PARTS LISTS
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16
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QUICK START
With a full understanding that very few people like to read manuals or have the time to do so, we have
created a Quick Start manual which will get your printer operating in just a few minutes.
To keep your printer operating properly, it is important to read and understand this manual which
explains the basic operation of this printer.
The specification section includes drawings with the basic dimensions of the printers, the net weights, maximum
die capacities, maximum print width and print drum circumferences. This section also lists the specifications for
the printing dies and an explanation of the Non-Indexing models and the mounting configuration.
PREFACE
The Universal WPNP-400NI-PIDS & WPNP-400NI-PIDS-D Non-Porous Web Printers meet the requirements for
printingon non-porous continuous web materials. A 4” print widthcapacity and a 19.68” circumference print drum
easily accommodates large logos and text messages. These printers are designed for top mount installations
and are only available in a non-indexing (continuous print) model.
The following pages of this manual explain the installation, operation and maintenance of the WPNP-400NI-PIDS
& WPNP-400NI-PIDS-D Series of Non-Porous Web Printers.
TheWPNP-400NI-PIDS-D Digital Web Printers are offered in two different configurations for use with Universal’s
PIDS-DIGITAL-CE Programmable Ink Delivery Systems. To provide the necessary web motion and velocity
information to the PIDS-DIGITAL Control, one of the installed Web Printers must be equipped with an inductive
proximity sensor and a specially modified print drum. These specially modified printers are considered digital
models and have model numbers WPNP-400NI-PIDS-D and WPNP-400NI-T-PIDS-D.
If a second Web Printer is installed on the same web line, it does not need the inductive proximity sensor and will
operate as a slave printer to the primary digital printer installed. In this instance, the second printer must be
printing on the same web as the primary printer and must be printing the same amount of text since both printers
will receive the same amount of ink from the PIDS Control System. Specific details on the Digital Models are
provided on page 16 of this manual.
NOTE: The “D” in the stock number indicates a Digital model, the “T” indicates “Telos Drum Cover for metric
RIBtype”.

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SPECIFICATIONS
WPNP-400NI-PIDS & WPNP-400NI-T-PIDS
WPNP-400NI-PIDS-D & WPNP-400NI-T-PIDS-D SPECIFICATIONS
NET WEIGHT: 22 LBS. - 2 OZS. (10.04 KG.)
MAXIMUMDIESIZE STANDARD: 4” (30 RIBS) X 19-1/8” LENGTH
MAXIMUM DIE SIZEMETRIC: 100 MM (28 RIBS) X 430 MM LENGTH
PRINTDRUMCIRCUMFERENCE: APPROXIMATELY 19.68" (500 MM) MEASUREDAT THE DIE FACE
(166mm)
6.53”
4.53”
(115 mm)
14.27”
16.16”
(362mm)
(410mm)
(221mm)
(94mm)
(293mm)
(159mm)
8.69”
3.72”
11.54”
6.27”
MIN
MAX
123

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SPECIFICATIONS
Printing dies are manufactured to precision thickness
tolerances which are very critical to the performance of
these printers. When installed, the face of the printing die
should extend only .007" - .008" beyond the radius of the
Bearer rings as shown in Figure 1. Using dies that do not
meetthedesignspecificationswillresultinpoorprintquality
and possible damage to the transfer roll.
Although there are several competitive rib backed die
systemsavailable,itisveryimportant to note that they are
not all made to the same rib spacing or thickness
specifications and they are not interchangeable.
Universal also offers Metric RIBtype® Die Systems for use in countries where metric character sizes are the
standard. The Metric dies are thicker and the rib spacing differs slightly from the standard printing dies therefore
the two versions are not compatible. To accommodate the differences, the print drums for Metric dies are
machined to a slightly different diameter from the U.S. versions.
The printer model numbers on Metric printers will have a “-T” suffix and the Metric Drum Covers have a distinct
pinkcolor.
Dies are also available in “logo” form in which a complete text message is produced on a single piece of rib
backed rubber. Logo dies are much faster to change and generally produce better print quality due to their
unitized construction. Custom type styles, company logos, and trademarks can also be photographically
reproduced from black and white art work.
RIBtype® PRINTING DIES
Universal Non-Porous Web Printers are designed to use Universal RIBtype® printing dies which have a molded
ribbacking. TheribsonthebackofthediesnapintomatingribsintheDrumCoverontheprintdrum. Theprinting
dies are produced in many standard character styles and sizes and are available in sets containing a combination
of individual alphabetic and numeric characters or in sets containing numeric characters only. These character
sets or “sorts” can be used to make up text messages and code numbers as necessary.
BEARER RING
.007” - .008”
PRINTING DIE
DRUMCOVER
FIGURE1
PRINTER MODELS DESIGNED FOR METRIC RIBtype® PRINTING DIES
FIGURE2
XF NEOPRENE INK ROLLS FOR THE WPNP-400NI-PIDS SERIES
TheWPNP-400NI-PIDS SERIESsystemsare designedtouse there-inkable,
XF Neoprene Ink Rolls made from an extra firm density neoprene material.
The extremely fine cell structure of these rolls provides exceptionally good
print quality and can be used with a variety of alcohol or glycol base inks.
Unlessyouordereda pre-inkedrollwithyourmachine,theserolls aresupplied
in a dry condition. Pre-inked rolls are available from the factory and are
recommended for first time users but if you have a dry roll, please follow the
pre-inking instructions on page 14.

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MIN
MAX
123
Use two 3/8” diameter bolts to attach the printer’s mounting bracket to a rigid mounting plate. Ensure that the
printer is aligned to track parallel with the web material and that both Rubber Friction Bears on the Print Drum
contact the web with equal pressure.
When printing on thin materials, it is imperative that the print drum is supported by an idler roll or a flat
platen under the web as indicated.
ThePIDSSystemwhichwillsupplyinktotheprinterduring operation should be located as close as possible to the
printertominimizethelengthoftheink tubes through which the ink is fed. (See additional details on the installation
of the PIDS System in the PIDS Manual.)
WEB TRAVEL
INSTALLING THE PRINTER
When choosing a location for the installation of the printer, several issues should be considered:
1 - It is always best to install the printer in a location that is free from dust and other contaminates which can cause
degradation of the print quality. Fast drying Non-Porous Inks become tacky during the drying process and printing
dies will pick up dust particles and require more frequent cleaning.
2 - If possible, install the printer in a location that provides for easy access.Although the inking system on these
printers can be removed in seconds for convenient maintenance on a work bench, changing printing dies requires
easy access to the print drum.
3 - The WPNP-400NI-PIDS Printers should be mounted at an angle of 15 to 30 degrees from horizontal as
indicated in the Figure below.
IDLERROLL
FIGURE 3
15 - 30 DEG.
QUICK START

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FIGURE 5
The WPNP-400NI-PIDS SERIES Non-Porous Web Printers are designed for top mount installation to print on
continuous non-porous web materials. To prepare the printer for use, the following steps should be followed.
PREPARING THE PRINTER FOR INSTALLATION OF THE INK ROLL
These Printers have been designed with an easily removable inking system. The Ink Rolls can be installed with
the inking system on or off the printer. Prepare the printer as follows:
3 - Loosen the Inking System Locking Knob by turning the
knob counterclockwise approximately 1 revolution.
FIGURE 4
QUICK START
FIGURE 6
1 - Remove the Thumbscrews from both sides of the Inking
System
2 - Carefully remove the Wiper Adapter from the Inking
System. Do not damage the thin Mylar Wiper.

8
6 -Remove the Knurled Retaining Nut by turning it in a
counterclockwise direction.
5 -Remove the Drive Wheel Cover by lifting it straight off
the axle and locating pin.
FIGURE9
4 -Swing the Inking System Locking Assembly to the left
(counterclockwise) as shown.
5 -The Inking System can be removed for off-line
installation of the Ink Roll by grasping the Inking System
Assemblyby the lifting tab andpulling theInking System
out of the machine.
FIGURE7
QUICK START
FIGURE8
FIGURE10

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6 -Remove the Knurled Drive Wheel.
Note: TheKnurled DriveWheel isinstalled onthe top
of the Anilox Roll and is engaged by 3 stainless steel
drivepins.
FIGURE11
QUICK START
7 -Remove the Inking System Cover by carefully pulling
the Cover straight off the axle. Be very careful not to
let the cover drag across the surface of the Anilox Roll
during removal.
FIGURE12
FIGURE13
PREPARING THE XF NEOPRENE INK ROLL FOR INSTALLATION
It is imperative that the ink roll installed on this printer is properly inked and prepared for installation. If
youorderedapre-inkedrollwithyourprinter,thefollowingstepswillguideyouthroughthepreparationand installation
of this roll. If you have a dry roll, see page 14 for inking instructions.
1 -To prepare the pre-inked roll for installation, you will
need a clean piece of cardboard, a pair of rubber gloves,
a pair of scissors or razor knife and a round metal rod
approximately1/4” -3/8” (6mm - 9mm) diameterby atleast
6” (150mm) long. Around shank Phillips screwdriver will
work nicely.
Note: Ink will stain clothes and other materials so careful
handlingisrequired during this procedure.

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QUICK START
1 -Rotate both the Ink Roll Eccentric Knobs on the Inking
System Cover to the “MIN” position.
In this position, the ink roll will not touch theAnilox Roll
whenthe cover isreinstalled.
2 -While holding the Inking System Cover in one hand, slide
the Ink Roll onto the Ink Roll Axle.
INSTALLING THE INK ROLL
FIGURE16
FIGURE17
Usetheroundrodorscrewdriverusedduringtheinkroll
preparation procedure to position the roll and slide the
roll onto the ink roll axle.
3 -Insert the screwdriver through the hole in the plastic
core and roll the Ink Roll several times across the piece
of cardboard while applying light pressure to remove
the excess ink.
For most applications, you want the roll to be fully saturated
but not dripping wet. If in doubt about the proper saturation
level of the roll during this process, it is better to remove a bit
more ink than not enough. Installing a roll with too much ink
will cause dripping inside the inking system housing. For
applicationswherewebspeedisover 400 RPM,removemore
ink from the roll in this process.
2 -Put on the rubber gloves and carefully cut the end of
the bag open and remove the Ink Roll.
Pre-InkedRollsareintentionallyoversaturatedtoprolong
storagelife. There maybea small amountof liquid inkin
the bag when it is opened so be careful handling the
openedbag after theroll isremoved. Ink mayrun out.
FIGURE14
FIGURE15

11
QUICK START
3 -Carefully guide the Cover Assembly onto the Inking
System being careful not to scratch the surface of the
Anilox roll in the process.
FIGURE18
4 -When the cover assembly is properly positioned against
the Inking System Assembly, replace the Knurled Drive
Wheel.
Carefully align the 3 stainless steel pins on the
topoftheAniloxRollwiththe3holesinthe Knurled
Drive Wheel. When the Knurled Drive Wheel is
properly engaged, the top of the stainless steel
pinswillbeapproximatelyevenwiththetopsurface
oftheKnurledDrive Wheel.
FIGURE19
FIGURE20
FIGURE21
6 -While holding the Drive Wheel Cover in position, replace
the Knurled Retaining Nut. The Knurled Nut should be
just tight enough to hold the Drive Wheel in place. Do
not over tighten this nut.
The inking system is now ready for final adjustment and use.
5 -Replace the Drive Wheel Cover by aligning the two holes
in the cover with the Anilox Roll Axle and the Stainless
Steel Locating Pin. Ensure that the cover is positioned
completely against the Inking System Cover.

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QUICK START
2 - Rotate the Inking System Locking Assembly to the
vertical position and lightly tighten the Locking Knob.
1 -Align the Inking System baseplate with the two slots on
the inside of the Printer Side Frames and slide the
Inking System into the printer.
REINSTALLING THE INKING SYSTEM ON THE PRINTER
FIGURE22
FIGURE23
FIGURE24
FIGURE25
3 -Carefully insert the Wiper Adapter into the Inking
System. The plastic Wiper must be installed under
the Ink Roller with the side of the Wiper Block marked
“INSTALL THIS SIDE UP” facing up as shown.
4 -Reinstall both Thumbscrews to secure the Wiper
Adapter.

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1-To install Printing Dies on the Print Drum, first mix a solution
of water with a small amount of liquid dishwashing detergent
to serve as a lubricant. This will make the installation of the
die much easier. Using a sponge saturated with this mixture,
moisten the ribs on the back of the Die.
2-Align the ribs on the back of the printing die with the grooves
in the Drum Cover. Starting with one end, firmly press the
die into the drum cover until fully engaged. Continue
pressing the ribs together, working from one end of the die
towards the other.
Do not use any other lubricants such as silicone or oil
on the Printing Dies.
INSTALLING THE PRINTING DIES
3- While rotating the Print Drum by hand or under power, slowly
rotate both the Ink Roller Eccentric Knobs from the “MIN”
towards the “MAX” position and observe the face of the
printing dies for ink. Proper adjustment should be reached
at a position between the “2” and “3” reference numbers.
TheInkRoller Eccentric KnobsmovetheInk Roll intocontactwith
the Anilox Roll. The Eccentrics should not be turned any more
than necessary to apply a uniform coating of ink to the die face.
ThePositionAdjustingKnobsservetwofunctions. First,they provide adjustment for the contactpressure between
theAniloxRollandthefaceof the Printing Dies. TheAniloxRollshouldcontactthefaceoftheprintingdies with just
enough contact pressure to properly transfer ink. Secondly, the Adjusting Knobs allow for a small degree of
angularalignmentbetweentheAniloxRolland the face of the dies. ThesurfaceoftheAniloxRollmustbeadjusted
exactly parallel with the face of the Printing Dies in order to ensure uniform transfer of ink across the full width of
the Print Drum. If adjustment is required, loosen the Inking System Locking Knob and make small adjustments to
the Position Adjusting Knobs. Retighten the Inking System Locking Knob and check the print quality. After the
correct adjustment has been made, the Position Adjusting Knobs should require no further adjustment.
INKING SYSTEM POSITION ADJUSTING KNOBS
1 - There are 2 Position Adjustment Knobs on the Joining Bar at
the bottom of the slots with threaded shafts which contact the
front of the Inking System Baseplate. These knobs have been
roughly set at the factory but may require fine adjustment when
the system is first used.
Donotadjustthese Knobs unlesstheprintqualityindicates
a need to do so.
QUICK START
FIGURE26
FIGURE27
FIGURE29
FIGURE28

14
Note: Dry rolls must be pre-inked before using the PIDS System.
PRE-INKING A NEW XF NEOPRENE INK ROLL
Warning: Non-Porous Inks contain flammable solvents. Do not smoke or handle these rolls in the presence of sparks
or open flames. Inks will also stain clothing, furniture, carpeting and your hands. Rubber gloves should be worn
during the following procedures.
Please follow the guidelines below to properly pre-ink your roll:
1 - Wearing a pair of rubber gloves, pour approximately 1” of
printer ink into the bottom of a clean container large enough
to place the roll in on it’s side. Carefully place the roll into
the container of ink.
A 4” XF Neoprene Roll will hold approximately 14 fluid
ounces of ink
2 - Hold the roller in your hand and firmly press down on the
foam side of the ink roll and then release the pressure.
Rotate the roll and repeat this process several times pressing
on different areas. This will force the air out of the roll and
the voids will be filled with ink.
Repeattheprocess above untilallthe ink in thecontainerhas
beenabsorbedinto the roll.Add more ink tothecontainerand
repeat the process until the roll will absorb no more ink.
3 -Insert a round metal rod through the Ink Roll Core and
roll the roller several times across a scrap piece of
cardboard while applying light pressure to remove the
excess ink.
FIGURE30
FIGURE31
FIGURE32
TheXF Neoprene InkRollsused ontheWPNPPIDS Printersaremanufactured fromanextrafirm densityneoprene
foam material. The extremely fine cell structure of this foam gives it the capacity to hold and evenly distribute a
large volume of ink which migrates through the foam by capillary action. The ink roll relies on capillary action to
draw ink from the center of the roll and evenly distribute it to the surface where it is applied to the transfer roll. The
capillary action of ink in a dry foam material is rather poor, much like when you submerge a dry sponge in water.
When the roll is initially pre-inked, it must be thoroughly saturated to ensure all of the cells in the foam are wetted
with ink. Even if all of the ink is squeezed out of the roll after the initial inking, the capillary action of the roll is
dramaticallyincreased.Maximizingcapillary actionis extremelyimportant whenusingaPIDSSystemforsubsequent
automatic inking.
Youwant the rollto be fullysaturatedbut not drippingwet. If
in doubt about the proper saturation level of the roll during
this process, it is better to remove a bit more ink than not
enough.Installingarollwithtoo much ink will causedripping
inside the inking system housing.
QUICK START

15
BASIC PRINCIPLES OF OPERATION
FIGURE33
THE PIDS SYSTEM
The positive displacement peristaltic pump heads used in the PIDS systems move ink through progressive waves
of contraction and relaxation of a resilient pump tube. The ink never touches any of the pumps component parts
so maintenance is limited to replacing the pump tube after approximately 1,000 hours of operation. Universal’s
quick disconnect replacement pump tube assembly, facilitates pump tube changes in less than 10 seconds.
Universal’s Programmable Ink Delivery Systems were developed as an advanced method of supplying ink “on-
demand” to contact roll printing equipment. The PIDS system combines the simplicity of electronic programming
and the accuracy of peristaltic metering pumps to automatically deliver precise amounts of ink to the printers at
prescribed intervals.
The PIDS system works with the Non-Porous Web printers through a
unique wiper adapter as shown. Ink from the PIDS System is injected
through a pair of miniature duck bill check valves between two very thin
plastic membrane wipers which rest against the face of the ink roll. The
wipers transform the ink into a very thin film which is then evenly spread
across the entire face of the roll. This design provides instantaneous
printer response, ensures uniform print density over the full print width of
the printer .
It is very important to note that when web velocities exceed 400 FPM, having a large volume of ink in the printer’s
ink roll can cause inking system leakage problems. The higher RPM of the ink roll at these web velocities will
cause ink to rise to the surface of the ink roll and can result in ink being thrown off the surface of the roll and into
the inking system housing. To avoid this potential problem in high speed printing applications, the ink roll should
initiallybe thoroughly saturated to prepare it foruse and then most of the inkshould be removed from the roll prior
to installation. This process wets all the cells in the foam and dramatically increases the rate of ink absorption
when it is delivered by the PIDS-DIGITAL-CE System. It is important to understand that the ink required for
printingwill bedeliveredbythe PIDSSystemas neededsohavinga largevolumeof inkintheink rollisunnecessary
and undesirable.
PIDS-DIGITAL-CE PROGRAMMABLE INK DELIVERY SYSTEMS
The PIDS-DIGITAL-CE Programmable Ink Delivery Systems require constant data input from a low resolution
encoder in order to monitor web motion and velocity. To eliminate the need to install a separate friction driven
encoderonthemoving web, it was determined thatthemostefficientwayto provide this data, without complicating
the installation, was to modify the friction driven printers which allows them to serve a dual purpose.
The details of this modification are provided on the following pages.
IMPORTANT NOTE FOR HIGH SPEED PRINTING APPLICATIONS

16
BASIC PRINCIPLES OF OPERATION
ENCODER SENSOR FOR DIGITAL MODELS
The WPNP-400NI-PIDS-D Digital Printer has been modified to work with Universal’s new PIDS-DIGITAL-CE
Programmable Ink Delivery System. The PIDS Control System requires an encoder signal from the printer to
track web velocity and to enable programming based on web distance traveled. To eliminate the need to install a
separate,frictiondrivenencoderonthemovingweb,asimplelowresolutionencoderassemblyhasbeeninstalled
on the printer.
The center hub of the print drum has
four 0.250" diameter steel targets
installed which are sensed by the
inductive proximity sensor as the print
drum rotates.
Warning: Theinductiveproximity sensor is averyfragiledevice and mustbehandledcarefullyto prevent damage.
The sensor extends out from the side of the printer side frame a short distance to expose the internal LED lights
and enable connection of the communication cable. When handling the printer care must be taken not to damage
the exposed end of the sensor.
INSTALLATION OR ADJUSTMENT OF THE INDUCTIVE PROXIMITY SENSOR
The inductive proximity sensor has been properly installed, adjusted and tested at the factory prior to shipment
and no further adjustment should be required. If for any reason the sensor needs to be re-adjusted, please read
the following instructions carefully.
1-To remove or re-adjust the inductiveproximity sensor you must first slightly loosen the nylon tip set screw. Use
a 5/64" hex driver to loosen the set screw which holds the sensor in position. This set screw can be reached via
the access hole in the top of the frame as shown in Figure 34.
An inductive proximity sensor (A) is
mountedintheside frame of the printer
through an electrically isolated plastic
bushing (B).
This design provides the PIDS Digital Control with the required 4 pulse per revolution encoder signal when the
printer is operating and also lets the control know when the web has stopped moving.
FIGURE34
When the sensor is threaded into the
bushing and adjusted to the correct
position, a nylon tipped set screw (C)
is used to prevent it from vibrating out
of its proper position.
B
A
C

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2– The inductive proximity sensor can now be rotatedin either direction for adjustment purposes or rotated inthe
counter clockwise (CCW) direction and unscrewed completely from the bushing for removal.
Note: The threaded body of the sensor has very fine 5mm x 0.5mm threads for accurate adjustment. Removing
the sensor requires many revolutions before it will come free from the bushing.
3 –Adjusting the Inductive Proximity Sensor: This sensor has a very short distance sensing range and must be
adjusted precisely for proper operation. The easiest way to begin the adjustment procedure is to use a 0.020"
shim positioned between the face of the sensor and the hub of the print drum as shown in Figure 35. While
holding the shim between these two surfaces, turn the sensor Clockwise (CW) until the face of the sensor just
pushes the shim into contact with the hub of the print drum. When the sensor is in this position, just slightly
tighten the nylon tip set screw to prevent the sensor body from turning.
Warning: Overtighteningthis set screwcan damage the sensor.
4 - Connect the communication cable from
the PIDS Control to the sensor. Use your
fingers to prevent the sensor body from
turning when connecting the cable.
5–Turn thecontrol power onand rotate
theprintdrumbyhand.Whenthesensor
is adjusted properly, the LED lights
(visibleonthesensorbody)willflasheach
time one of the four steel targets in the
print drum hub rotates past the face of
thesensor.
If the LED lights stay on constantly while
rotatingtheprint drum,thesensoris picking
up the aluminum hub.
To correct this, rotate the sensor body approximately 1/8th of a revolution CCW or until the LED lights only come
on when a steel target passes the sensor’s face.
Note: The nylon tip set screw is only very lightly tightened and should only need to be loosened by turning it
approximately 1 revolution in the counter clockwise direction. Do not take the set screw completely out of the
plastic isolator bushing or it will be somewhat difficult to re-install.
If the LED lights do not turn on at all during print drum rotation, rotate the sensor body slightly CW until the lights
begin to flash only when the steel targets pass the sensor face.
6 – When the sensor is working properly, slightly tighten the nylon tip set screw to prevent the sensor from
moving out of position.
FIGURE35
.020”
GAP
BASIC PRINCIPLES OF OPERATION

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CLEANING THE PRINTER
MAINTENANCE
1 -To remove ink contamination from the surface of the
machine, moisten a soft cotton cloth with the appropriate
ink solvent and rub it across the contaminated area.
The surface of the transfer roll is made from DuPont Delrin material and the O.D. of the roll is finely engraved
which enables it to hold a uniform film of ink. This surface material is very fragile and under no circumstances
should you attempt to clean it with anything abrasive.
1 -To clean dust and ink residue from the surface of the
transfer roll, first remove it from the printer. Lightly
saturate a soft cotton cloth with the appropriate ink
solvent and gently rub the surface of the roll until it is
clean.
Warning: Most of the ink solvents used for cleaning are flammable liquids. Follow all safety precautions
recommended by the manufacturer during this process.
Ifthetransferrollissubmergedinsolvent,thebearingswill
bepermanentlydamaged.
Thefrequency of requiredcleaningcan be greatlyreducedif the
inkingsystemiskeptinproperadjustmentduringnormaloperation
and if the ink roll does not become over saturated with ink.
DO NOT SUBMERGE THE TRANSFER ROLL IN SOLVENT!
CLEANING THE TRANSFER ROLL
FIGURE36
FIGURE37
Periodically, the inking system should be disassembled and inspected for ink residue and dust contamination.

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3 - Blot the surface of the die with a clean paper towel to dry
and reinstall the clean dies on the printer.
CLEANING THE PRINTING DIES
1 - Place the contaminated Printing Die on top of several layers
of paper towels to absorb the excess solvent. Pour just
enough solvent on the face of the printing die to cover the
die face.
2 - Using the toothbrush, carefully scrub the face of the die
to remove the contamination and old ink as shown. Add
more solvent as necessary and repeat the process until
the die is clean.
Do not submerge or soak the dies in solvent as this may cause
swellingofthe rubber compound.
MAINTENANCE
FIGURE38
FIGURE39
FIGURE40
All inks which are formulated for printing on non-porous surfaces contain a resin binder which bonds the dye or
pigmentintheinktothesurfaceofthematerialbeingprinted. As the ink begins to dry,thisbinderbecomes“tacky”
or“sticky”. While in this stage of the drying process, the tackonthe dies will tend to pick up both airbornedustand
any dust or dirt on the surface of the material being printed. When this happens, the dies should be cleaned or
replaced. Theeasiestmethodofcleaningthediesrequirestheappropriatesolvent for the ink being used, a pair of
rubber gloves, safety glasses, an apron to protect your clothing is recommended, a toothbrush, some clean paper
towels and a plastic bag to protect your workbench from staining. (Naturally, the toothbrush will never be suitable
for oral hygiene use after this process.)
After some period of use, the accumulation of contaminates on the dies will cause degradation of the print quality;
cleaning the printing dies, excluding excessive wear to the die face, will restore the print quality of the printer.

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1
2
3
4
5
6
7
8
9
10
19
18
17
16
15
20
21
22 23 24 29
30 31
32 33 34
25 26 27
28
11
12
13
14
35
36
37
38
KEYNO. DESCRIPTION QTY. REQD.
PARTNUMBER
1
2
3
4
4”TRANSFERROLLASSEMBLY
1
WPNP-TRA-4
4”TRANSFERROLLAXLE
1
WPNP-009
KNURLEDDRIVEWHEELW/DELRINWASHER
1
NP-14
PIDS-60 WPNPINKINGSYSTEMCOVER,REMOVABLE
1
WPNP-400NI-PIDS & WPNP-400NI-T-PIDS NON-POROUS WEB PRINTER
5
HP-04 13/8” BRASS, FLAT WASHER
39