Numberall 250P User manual

NUMBERALL
STAMP & TOOL CO., INC.
USER MANUAL & PARTS LIST
MODEL
250P
1/4” – 3/8” Characters
S/N:
___________________________
TEL: [phone]
FAX: [phone]
P.O. BOX 187, 1 HIGH ST.
SANGERVILLE, ME 04479 www.numberall.com
[email protected]

OPTIONAL HOT STAMPING EQUIPMENT
Numberall manufactures hot stamping versions of the Models 70, 80, 83, 85, 23,
and 50 Numbering Heads. Due to their hot stamping capabilities, the Model
numbers are thereby referred to as Models 270, 280, 283, 285, 223, and 250,
respectively. Since field applications and press equipment vary, most hot
stamping numbering heads are individually modified to suit customer
requirements.
All hot stamping numbering heads are designed to allow for thermal expansion.
Various models have unique features to minimize friction and aid in character
changes.
The Models 280, 285, and 283 have insulated turning knobs so that the wheel
shaft can be rotated. The Model 283 selector knob has holes drilled in it. An
insulated pin inserted into the holes allows for rotation of the selector knob.
The Model 250 has rollers on the coil return spring pins to minimize friction. A
“pick” is also supplied to preset the wheels. Inserting the “pick” between each
wheel and pushing, can individually rotate the wheels.
The hot stamping equipment, when purchased, includes the heating elements, a
cord and switch. A temperature controller is not included unless purchased as an
option. An overheated numbering head is not covered by warranty, unless wired
to our proportional temperature controller. Refer to the catalog and price list for
additional options to hot stamping.
Precautions
The following precautions should be observed when assembling and operating
hot stamping equipment:
1. Numberall’s hot stamping numbering heads are designed to operate below
350° Fahrenheit. Operations at higher temperatures can anneal hardened
parts and springs and combust insulating handles.
2. At normal operating temperatures, metal parts can burn the skin. Operational
procedures and written warnings should be created and posted to protect the
operator.
3. Some plastics give off harmful vapors when heated. A thorough knowledge of
the materials to be stamped is essential.
4. Enclosed is a canister of special high temperature grease. When cleaning
and maintaining the unit, LIGHTLY coat the wheel shaft and the outside of
the actuating arm with the grease. The grease will improve the operation of
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the unit as well as prevent corrosion that can occur with hot stamping units.
Do not attempt to lubricate with any other lubricant; some lubricants will break
down and leave deposits on the wheels, which can cause the wheels to bind.
5. Allow ample warm up time before stamping. A large mass of metal will heat
slowly.
6. Do not attempt to clean a numbering head before disconnecting the power
and allowing it to cool. The heating elements, when on, are much hotter than
the flash point of most solvents.
7. Protect heater wires and thermocouple leads. These wires are fragile and
could easily be broken.
8. Make sure the heaters are mounted well into the frame with no parts
exposed. Exposed heater sections will overheat and could damage the
element.
9. A CLEAN HEAD IS A MUST. A MAINTENANCE SCHEDULE MUST BE
DETERMINED SO THAT EXCESSIVE DOWNTIME OR DAMAGE CAN BE
AVOIDED.
When ordering parts or obtaining information, always mention the serial number.
If you have any questions or problems our sales department is at your disposal.
Revision # 2.0

MODEL 250P AUTOMATIC NUMBERING HEAD
for 1/4” – 3/8” Characters
Operating Instructions
1. DO NOT DROP OR ABUSE THE MODEL 250P. The Model 250P is a
precision machine; carelessness could damage the pawls or springs.
2. When inserting the Model 250P into the press, make sure the numbering
head frame bears the load. The shank aids only to hold the head in the press.
Stress should not be applied to the shank. THE MODEL 250P SHOULD
NEVER BE HAMMERED OUT OF THE PRESS.
3. The actuating arms (50-3-2) should be facing towards the operator for right
side up stamping.
4. The wheels in the Model 250P can rotate in only one direction, away from the
actuating pawl (50-3-10). Damage to the actuating or retaining pawls can
occur if the wheels are forced in the wrong direction.
5. Never attempt to stamp on a surface, unless it is perpendicular along both
axes to the Model 250P printing plane. Damage to the actuating or retaining
pawls can occur if this warning is not heeded.
6. Make sure that each number wheel is completely indented before stamping. If
the wheels are indented properly, they should snap or click back into the
indent position after being rotated slightly beyond that position. Stamping with
the wheels between indents can damage the actuating or retaining pawls.
7. When adjusting the tripping mechanism, make sure the wheels do not begin
to rotate while they are still in contact with the work. In addition to moving the
work, rotating the wheels could damage the actuating pawl.
8. When adjusting the tripping mechanism, make sure the actuating arm does
not bottom-out on the actuating stop pins. It is possible to shear these pins,
possibly damaging the numbering head.
Marking Instructions
These instructions assume the operator is facing the front side of a press-
mounted Model 250P Numbering Head. The actuating pawl (50-3-10) is on the
front side. The following procedure adjusts the numbering head to stamp
consecutive numbers beginning with the number one.
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It is possible to stamp consecutive numbers in two forms. The zeros preceding a
number may be included or excluded. For example, the number 25 may be
stamped as 000025 or as 25.
Including Zeros
These instructions include the zero preceding a number.
1. Using the “pick” supplied with the Model 250P, rotate the unit wheel, which is
the right most wheel, by inserting the pick between the wheel and pushing on
the index plate. Rotate it away from the actuating pawl (50-3-10) until the
number 1 is at the bottom.
2. Rotate the other wheels away from the actuating pawl until the number zero is
at the bottom.
3. If the tripper assembly and the press are properly adjusted, the Model 250P is
ready to stamp consecutive numbers.
Excluding Zeros
These instructions exclude the zeros preceding a number.
1. The unit wheel is the right most wheel. Rotate it away from the actuating pawl
(50-3-10), until the number one is at the bottom.
2. Rotate the other wheels away from the actuating pawl, until the number zero
is at the bottom.
3. Further rotate the wheels, except the unit wheel, slowly until it snaps into the
next indent. At this wheel position a recessed space is downward and hence,
no impression will be made. As the consecutive number increases, each
wheel will still advance at the proper time.
Disassembly Instructions
The following directions assume the numbering head is resting with the front side
up and the frame legs toward the operator. The actuating pawl (50-3-10) is on
the front side. The Model 250P can be disassembled in any convenient position,
but the directions are for a head in the above location.
1. Choose a clean bench to disassemble the Model 250P.
2. CAUTION: Wear safety glasses when disassembling the Model 250P.
Springs, which are part of the head, could fly out during disassembly and
cause eye injury.
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3. Remove the loops of the left and right coil return springs (50-3-6) from the left
and right coil return spring pins (50-3-7). CAUTION: These springs are under
considerable tension and should be handled carefully.
4. Loosen both left and right coil return spring screws (50-3-8) and remove the
springs from the arm bar (50-3-3).
5. Twist a piece of flexible wire around the actuating arm cross head (50-3-2)
and the actuating pawl (50-3-10). Pull the actuating pawl far enough toward
the cross head, so that it clears the wheels. Take care not to damage your
fingers.
6. Remove the three machine screws that hold the retaining pawl spring (50-3-
25). Mark the outside of the spring before removing it.
7. It is not necessary to remove the pawl block (50-3-23) in order to remove the
wheels.
8. Remove both wheel shaft set screws. Pull the retaining pawls (50-3-21) away
from the wheels.
9. Slowly push the wheel shaft (50-3-18) out of the frame (50-3-1). Take care
not to drop the wheels or the actuating arm. Maintain the original wheel order
for proper assembly. The actuating arms should be treated with care. If it is
twisted, re-assembly may not be possible.
Removing the Pawl Block (50-3-23)
1. Remove the two pawl block screws (50-3-24). The pawl block (50-3-23)
should lift out. The pawl block fits tightly in the frame and it may be necessary
to tap it. Care should be taken not to bend the retaining pawls (50-3-21) or the
retaining pawl shaft (50-3-22).
2. If the retaining pawls are to be removed, maintain the original order for re-
assembly.
Removing the Actuating Pawl (50-3-10)
1. While holding the actuating pawl (50-3-10) to keep it from rotating, remove
the twisted wire.
2. Allow the actuating pawl to slowly rotate, relieving spring torque, until it strikes
the cross head.
3. Unscrew the actuating pawl shaft (50-3-9) from the arm, while holding the
actuating pawl spring (50-3-17) above and below with two fingers. Remove
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the actuating pawl shaft, be careful not to drop the actuating pawl. The spring
is under tension and could fly out.
Assembly Instructions
1. When assembling the Model 250P make sure all surfaces are free of dirt and
grit.
2. CAUTION: Always wear safety glasses when assembling the Model
250P. The springs to be assembled are under tension and could cause eye
injury.
3. The following directions assume the numbering head is resting with the front
side up and the frame legs toward the operator and the pawl block mill cut is
on the rear side.
4. If the actuating pawl is already assembled in the actuating arm, skip
instructions 5 through 16.
5. Cut a pin slightly shorter than the outside width of the actuating pawl and
small enough in diameter to slip through the actuating pawl and shaft holes.
6. Position the actuating pawl with the flat surface up and the legs toward the
operator. Start the pin from the left hand side through the hole in the leg and
halfway across the space between the legs.
7. Slip the actuating pawl spring (50-3-17) over the pin in such a way that the
right angle bend in the spring leg mates with the right angle surfaces between
the legs.
8. Rotate the other leg of the spring in the direction of increasing spring torque,
until it catches on the side of the pawl block opposite the flat side.
9. Push the pin completely through the spring and into the opposite leg of the
actuating pawl.
10.Make sure the pin is not longer than the width of the actuating pawl.
11.Position the actuating arm with the arm bar in a horizontal position and the
straight edges of the arm legs facing down.
12.Slide the actuating pawl in between the arm legs, with the actuating pawl
prongs pointing toward the arm bar and the actuating pawl spring down.
13.The actuating pawl must be moved in this position toward the arm bar until
the holes in the actuating pawl align with the actuating pawl shaft holes in the
arms. As the pawl is moved toward the arm bar, the spring leg, which extends
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toward the arm bar, must be rotated in the direction of increasing spring
torque and forced against the flat surface between the actuating pawl shaft
holes.
14.After aligning the holes in the arm and the pawl, start the threaded end of the
actuating pawl shaft (50-3-9) through the aligned holes. Carefully force the pin
out of the actuating pawl spring with the actuating pawl shaft. Ease the spring
onto the shaft as it is advanced. Some models have a spacer between the
actuating pawl and the actuating arms.
15.Securely tighten the actuating pawl shaft.
16.Rotate the actuating pawl in the direction of increasing spring tension until it
reaches a stop. Using flexible wire, fasten the actuating pawl to the actuating
arm cross head.
17.Slide the actuating arms between the frame legs. The straight edge of the
arm will be up.
18.Start the wheel shaft (50-3-18) through the frame leg from the right. Align the
right actuating arm and advance the shaft through the arm and halfway
across the space between frame legs.
19.Slide the wheels onto the shaft in the original order, advancing the shaft when
necessary. Make sure to remove any burrs on the wheels or actuating arms.
Use a medium India stone to remove burrs. CAUTION: the actuating arms
are chrome plated and should not be stoned more than is necessary. The
indent side of the wheels goes on the right.
20.The wheel shaft ends should be flush with the frame sides. Align the flats on
the shaft with the set screws (50-3-20) in the frame legs. Securely tighten the
set screws.
21.Turn the frame over with the retaining pawl block mill cut facing up and the
frame legs toward the operator. If the retaining pawl block is in place skip
instructions 22 through 24.
22.Slide the retaining pawls (50-3-21) onto the retaining pawl shaft (50-3-22) in
their original order. The working end of the unit wheel pawl is wider than the
other pawls and must be placed in the proper position.
23.Rest the retaining pawl block with the milled cut facing up and toward the
operator. Rest the retaining pawls with the shaft next to the milled cut and the
flat pawl ends up and toward the operator.
24.Mate the retaining pawls with their respective slots. Position the shaft in the
milled cut with its end flush with the pawl block ends.
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25.Holding the pawls into their slots, turn the pawl block over and insert it into the
milled cut in the frame. Make sure each pawl rests in between each wheel.
26.Evenly tighten the pawl block screws (50-3-24). Make sure the pawls do not
bind. They should work freely.
27.Position the retaining pawl spring (50-3-25) over the retaining pawls with the
original side out. The spring is not symmetrical and thus is only correctly
assembled one way. The spring “fingers” should align with the retaining pawl
centers.
28.Evenly tighten the retaining pawl spring screws.
29.Rest the frame with the front side up and the frame legs toward the operator
as in instruction 3.
30.Slide the right coil return spring (50-3-6) onto the arm bar (50-3-3).
Determine which is the right spring as follows: when viewed from the loop
end, the loop will be on the right hand side of the spring. NEVER interchange
springs from different Model 250P Numbering Heads.
31.Secure the inside end of the spring by tightening the coil spring return screws
(50-3-8).
32.Rotate the spring loop in the direction of increasing spring torque and slide
the loop over the coil return spring pin (50-3-7). CAUTION: The springs will
be under considerable torque and could rotate rapidly if released.
33.Repeat steps 30, 31, and 32 for the left coil return spring.
34.Remove the flexible wire holding the actuating pawl.
35.By hand, rotate each wheel away from the actuating pawl until they indent.
The Model 250P wheels will only rotate in one direction. DAMAGE to the
pawls can occur if they are forced in the opposite direction.
36.Check the operation of the Model 250P Numbering Head. The actuating arm
should operate smoothly without any binding.
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Recommended Spare Parts for Model 250P
• 1 Set Coil Return Springs (50-3-6) (Not required with Air-Trip)
• 1 Actuating Pawl (50-3-10)
• 1 Actuating Pawl Springs (50-3-17)
• 2 Retaining Pawls (Regular) (50-3-21)
• 1 Retaining Pawl (Unit) (50-3-21)
• 1 Retaining Pawl Spring (50-3-25)
• Spare wheels should be stocked depending on use and the material being
stamped.
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OPTIONAL AIR-TRIPPING ATTACHMENT
An air-tripping attachment is available for the Model 250P Automatic Numbering
Machine. This system is advantageous where press design or space limitations
makes mechanical tripping cumbersome.
Basically two small air cylinders mounted to the numbering machine, are used to
move the actuating arms, which move the wheels to the next number. A
miniature roller valve, activated by the movement of the press ram, controls air
flow to the cylinders. The mechanism works on the up-stroke of the press. Also
included is an adjustable speed control valve.
An air/logic control can be supplied which will repeat the same number up to 24
times before allowing the air cylinders to trip the unit.
The air-tripping system is designed for 60-80 psi. The cylinders and air plumbing
attached to the numbering machine come pre-assembled.
Precautions
The following precautions should be observed when assembling and operating
the air-tripping attachment:
1. The actuating arm bar moves very rapidly when the air cylinders extend.
Keep both hands completely free of that area.
2. The air-tripping system is designed to operate with a 60-80 psi air supply. A
filtered line is recommended to prevent any contamination.
3. The machine screws that secure the cylinder mounting bars to the frame must
remain tight. They are assembled at the factory using a thread sealant, but
should be periodically checked.
4. The tubing supplied with the tripping assembly is 1/8” nylon. All tubing fittings
are the compression type and do not require hollow cores because of the
small tubing diameter.
5. The standard air cylinder is single acting and spring returned. It has a bumper
system to cushion the end of the stroke. If the numbering machine is used for
hot stamping, a heat resistant bumper is required. The air cylinders DO NOT
REQUIRE LUBRICATION.
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Adjustments
The following instructions have been done at the factory prior to shipping.
However, if it is necessary to disassemble, the following adjustments may have
to be performed.
1. Adjust the length of the air cylinder rods so that they push evenly. Otherwise
the resulting twisting motion can bind the numbering machine. The rods have
been adjusted prior to shipping.
2. Do not over-tighten the shoulder screw, which secures the base of the air
cylinder. If over-tightened, the cylinder may bind. Also, the threads of the
shoulder screw must be sealed, since they extend into the air chamber. This
is done at the factory prior to shipping.
3. The travel of the air cylinders must be adjusted so that the numbering
machine indents (or clicks) at the end of the cylinder stroke. There are no
positive stops for the actuating arms in the Model 250P Numbering Machines
that are factory equipped with air tripping.
Assembly Instructions
The following general instructions apply to assembling the air-tripping
attachment. Since many options are available and most press installations are
customized, no detailed directions are available.
1. Mount the numbering machine to the press.
2. Design and mount a bracket for the miniature roller valve, so that the ram will
activate the valve on the upstroke. Make sure the valve does not open before
the numbering machine leaves the material surface. Bearing on the roller or
directly on the valve button can activate the valve.
3. Assemble the tubing so that the air flows from the supply through the valve
and to the air cylinders. Make sure the air lines are protected from the press.
Check all fittings, they should be air tight.
4. Adjust the length of the piston rods so that the numbering wheel clicks into
position just as the cylinders reach the end of the stroke. Loosening the jam
nut and rotating the piston rod adjust the piston rod. Tighten the jam nut after
adjustment. THIS HAS BEEN DONE PRIOR TO SHIPPING, SO
ADJUSTMENT MAY NOT BE REQUIRED.
5. Adjust the press so that the Model 250P numbering machine will clear the
table at all times during the ram stroke.
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6. Crack the adjustable speed control open and cycle the press. Keep both
hands completely clear of the table area when operating the press. If the
piston rods fail to fully advance the actuating arms, advance the wheel
manually to the next indent. Open the speed control further and cycle the
press. Continue this process until the numbering machine advances properly.
If the piston rods push unequally, adjust the lengths as per the previous
instructions.
If you have any problems or require additional instructions, please contact our
sales office. When calling always provide the serial number.
Revision # 2.0

Numberall Stamp & Tool Co., Inc.
For extra copies of this manual please call or
visit our website.
P.O. BOX 187, 1 HIGH ST.
SANGERVILLE, ME 04479 www.numberall.com
[email protected] TEL: [phone] FAX: [phone]