VAF instruments 247 User manual

Technical Manual
Instructions for installation,
operation and maintenance
247
TICKET PRINTER
For MidFlow
®
and HiFlow
®
series ‘J’ Vane meters
Publication nr TIB-247-GB-0711
Supersedes TIB-247-GB-1201

TABLE OF CONTENTS
1. PREFACE....................................................................................... 2
1.1 GENERAL................................................................................................. 2
1.2 COPYRIGHT............................................................................................. 2
2. GENERAL DESCRIPTION............................................................. 3
2.1 OPERATION OF ZERO-START PRINTER .............................................. 3
2.1.1 Drive .................................................................................................. 3
2.1.2 Reset ................................................................................................. 4
2.1.3 Printing............................................................................................... 4
2.2 OPERATION OF accumulative PRINTER ................................................ 5
2.2.1 Drive .................................................................................................. 5
2.2.2 Printing............................................................................................... 5
3. PRINTER REMOVAL AND INSTALLATION.................................. 6
3.1 REMOVAL ................................................................................................ 6
3.2 INSTALLATION ........................................................................................ 6
4. CLEANING AND LUBRICATING.................................................... 7
4.1 GENERAL................................................................................................. 7
4.2 CLEANING................................................................................................ 7
4.3 RECOMMENDED LUBRICATION............................................................ 7
4.4 LUBRICATION POINTS............................................................................ 7
5. TROUBLE SHOOTING................................................................... 9
5.1 GENERAL CHECKS (Figures 6 thru 10)................................................... 9
5.2 TROUBLE SHOOTING........................................................................... 11
5.3 TICKET POSITION ADJUSTMENT........................................................ 12
5.4 SALE NUMBER ADVANCING MECHANISM INSPECTION .................. 12
5.5 RIGHT HAND WHEEL INCHING MECHANISM ADJUSTMENT............ 13
6. REPAIR AND REPLACEMENT.................................................... 14
6.1 TICKET TRAY REMOVAL (Figure 14).................................................... 14
6.2 WHEEL REMOVAL................................................................................. 14
6.3 WHEEL INSTALLATION......................................................................... 15
6.4 TICKET TRAY INSTALLATION (Figure 14)............................................ 15
6.5 RESET GEARS REPLACEMENT AND TIMING OF PRINTER.............. 15
7. PARTS LIST................................................................................. 18
8. WARRANTY CONDITIONS.......................................................... 21

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1. PREFACE
1.1 GENERAL
This manual contains installation, operation and maintenance instructions for Ticket Printers series
7888 installed to VAF MidFlow®and HiFlow®liquid flowmeters Series ‘J’ . For IOM instructions of the
flowmeter section refer to Technical Manual 131 or 137 supplied with the instrument.
Every Ticket Printer is thoroughly tested at the factory before installation on the meter. However, like
any precision mechanism, it requires periodic care to ensure maximum service. This manual is for use
in areas where factory rebuilding facilities and adequate exchange stocks are not readily accessible
This manual contains important information for the installer, the operator and for your maintenance
department.
To ensure safe and correct installation and operation, study this manual carefully before starting
operations.
For any additional information contact:
VAF Instruments B.V. Tel. [phone]
Vierlinghstraat 24, 3316 EL Dordrecht Fax [phone]
P.O. Box 40, NL-3300 AA Dordrecht E-mail: [email protected]
The Netherlands Internet: www.vaf.nl
Or your local authorized VAF dealer.
Their addresses can be found on www.vaf.nl
1.2 COPYRIGHT
This manual is copyrighted with all rights reserved.
While every precaution has been taken in the preparation of this manual, no responsibility for errors or
omissions is assumed. Neither is any liability assumed for damages resulting from the use of the
information contained herein. Specifications can be changed without notice.
MidFlow®and HiFlow®are registered trademarks of VAF Instruments B.V.

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2. GENERAL DESCRIPTION
2.1 OPERATION OF ZERO-START PRINTER
The SERIES 788800 Ticket Printer (Zero Start) mechanically records and prints digital information
delivered to its drive shaft. This shaft positions the print wheels according to the ratio of internal and
external gears. Reset and print operations are manually actuated.
The zero-start printer is so-named because it begins to count at zero, and returns to zero when reset.
The printer total is the amount of delivery.
2.1.1 Drive
The shaft, figure 2, on the bottom of the printer is driven by a bevel gear from the meter-register or
other equipment. The printer’s bevel gear and shaft assembly turns in a counter-clockwise direction.
The internal bevel gear on the shaft drives the clutch assembly, associated pinions and the gear
assembly of the right-hand wheel.
Fig. 2: Drive Train
The zero-start clutch assembly prevents the printwheels from turning in a reverse
direction.

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2.1.2 Reset
During printing operation, the printwheels are reset to zero through rotation of the reset gear-train and
reset shaft, figure 3. During the “Print In” cycle, one complete clockwise revolution of the reset drive
gear turns the reset shaft gear and reset shaft to zero the print wheels.
2.1.3 Printing
In printing operation, a ticket is inserted into the slot of the ticket tray until it bottoms on the internal
stop.
a. As the printing crank is turned, the reset drive gear, figure 3, makes one complete clockwise
revolution until a positive stop is reached. As the ticket tray moves into position, the seal pin
pierces the ticket, holding it in place. This initial printing is made with wheels at zero.
b. At the completion of delivery, the crank is turned in a clockwise direction one complete turn until
the stop is again reached. During this cycle the second printing is made recording the amount of
delivery. At the end of the print cycle the ticket tray returns to original position and the seal pin
releases the ticket.

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2.2 OPERATION OF ACCUMULATIVE PRINTER
The SERIES 788801 Ticket Printer (Accumulative) mechanically records and prints digital information
delivered to its drive shaft. This shaft positions the print wheels according to the ratio of internal and
external gears. Print operations are manually actuated.
The accumulative printer is so-named because it is a non-resetting type that begins the count at the
accumulated total of the last delivery, prints it, accumulates a new total for the new delivery and prints
it. The amount delivered must be calculated by the operator.
2.2.1 Drive
The shaft, figure 4, on the bottom of the printer is driven by a bevel gear from the meter-register or
other equipment. The printer’s bevel gear and shaft assembly turns in a counter-clockwise direction.
The internal bevel gear on the shaft drives the clutch assembly, associated pinions and the gear
assembly of the right-hand wheel.
2.2.2 Printing
In printing operation, a ticket is inserted into the slot of the ticket tray until it bottoms on the internal
stop.
a. As the printing crank is turned, the reset drive gear, figure 5, makes one complete clockwise
revolution until a positive stop is reached. As the ticket tray moves into position, the seal pin
pierces the ticket, holding it in place. This initial printing is made with wheels as they were at the
completion of the last delivery.
b. At the completion of delivery, the crank is turned in a clockwise direction one complete turn until
the stop is again reached. During this cycle the second printing is made recording the accumulative
total of this delivery. At the end of the print cycle, the ticket tray returns to original position and the
seal pin releases the ticket.

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3. PRINTER REMOVALAND INSTALLATION
3.1 REMOVAL
The cover of the ticket printer must be removed to expose the internal mechanism prior to
maintenance and repair.
a. Break the seal and remove four hex head screws from the bottom of the Meter Register Frame.
Lift off the printer cover.
b. To remove the printer from the register frame, unscrew four socket head screws.
Lift off the printer from the register.
3.2 INSTALLATION
After maintenance and repairs, install the printer onto the meter as follows:
a. Turn the printer crank until the tray is in outward position and seal pin down. Remove printer knob
and shaft extension
b. Rotate the large idler gear (B) so that the timing marks on it and the printer gear (A) align, fig. 6.
c. Mount the printer onto the meter register and secure with four socket head screws.
d. Place the cover on the printer. Install the four hex head screws from the bottom of the register.
Tighten the screws to retain the cover.
e. Wire and seal the four hex screws.

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4. CLEANING AND LUBRICATING
4.1 GENERAL
Although the printer, when manufactured, is adjusted and lubricated, it does require periodic cleaning
and lubrication to give maximum service. Judgement of the intervals at which the printer requires such
service must necessarily be left to individual users, due to varying conditions of service. Under normal
circumstances, this will be no more than twice a year, or after each 100,000 units of measure
delivered.
4.2 CLEANING
a. Remove cover and case-assembly and detach printer from meter-register per Section 3.
b. Flush printing wheels, reset gears, and all drive gears with cleaning solvent. Blow out surplus
solvent with compressed air and lubricate unit.
c. If printing wheels are extremely dirty, a small brush may be used to scrub the figures.
CAUTION: DO NOT USE A WIRE BRUSH.
4.3 RECOMMENDED LUBRICATION
OIL : Anderol L-401-D or equivalent (Temperature range -60C to +253C).
GREASE : Anderol L-795 or equivalent (Temperature range -54C to +145C).
All lubricants used in the printer must be of a type which remains fluid over the full
temperature range to which the printer will be subjected. Also they should not oxidise or
dry out, leaving a gummy or perceptible residue
4.4 LUBRICATION POINTS
(Figures 4 and 5)
Apply recommended or equivalent oil to bearing surfaces of all shafts, studs, and bosses on which
parts move or rotate.
Apply recommended or equivalent grease to bearing and mating surfaces of all bevel gears, drive
gears, reset gears, wheel ratchets, ticket tray, shafts, studs, and bosses according to figures 4 and 5.

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Fig. 4: Lubrication points
Fig. 5: Lubrication points

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5. TROUBLE SHOOTING
5.1 GENERAL CHECKS (FIGURES 6 THRU 10).
If the reason for the trouble is unknown, it is necessary to examine the printer to be sure it functions
properly.
Observe function of the no back pawl by turning the crank in a counter clockwise direction. The no
back pawl should limit the rotation to 20 degrees.
Turn the crank in a clockwise direction. The one-turn stop pawl should stop the crank after one
complete turn.
Turn crank until tray is in rear position and seal pin is up.
While turning the crank, observe the following during the print-in cycle:
a. tray moves forward to print-in position, seal pin pierces ticket and wheels reset to zero.
b. print action occurs before stop.
c. simulate delivery by turning drive gear While delivery is being made sales number wheel
advances one digit.
Observe the following during the print-out cycle.
a. tray moves to rear printer.
b. print-out occurs showing the quantity delivered.
c. seal pin releases ticket before stop is reached.
Check print wheel end play for 0,5 mm to 0,65 mm.
Turn the printer so the printing arm faces you. Check the springs to see that they are properly
anchored.
Check roller on the printing arm for proper alignment on cam.
Examine stop pawl for proper assembly.
Turn the printer so the back faces you. Be sure the ticket stop screw is secure.
Check the tray support rods to be certain they are free and secured in place by four clips.
Turn the printer so the crank faces you. Be sure the springs are properly anchored.
Examine the E-ring retaining and pins to be certain that they are properly seated and thight.
Examine the three reset gears for damage or wear. Replace as required.
Fig. 6: Parts Identification