Martin Yale 959AF Installation, Maintenance & Operating Instructions page 12

To correctly set the spring tension, loosen the screw in the set
collar. Pull the collar away from the spring until there is no
pressure on the block. Push the collar and spring against the air
block and continue to push until the spring is compressed 3/4".
Lock the screw in the set collar.
5.2.4 Paper Guide Rollers.
The paper guide rollers are located two each on the upper and
lower accessory shafts. The upper rollers are rubber-covered
steel while the lower rollers are steel. Each roller has a set
screw and should be locked into position on the flat part of the
shaft.
The guide rollers function to control the last two to three inches
of the sheet as it exits the folding rollers, especially during slit-
ting, scoring, and perforating. Set and align the guide rollers to
approximately 1/4" from the paper margins to prevent skewing.
(See Figure 12 page 9)
5.2.5 Angular Control Adjustment.
Paper skewing to the right or left on the feed table (after enter-
ing the first folding roller) can be corrected by increasing or
decreasing the spring tension (changing the angle) on the sec-
ond folding roller. The adjustment screw can be accessed
through the hole in the right side cover. (See Section 5.3.8.)
NOTE: This adjustment is factory set and should only
require readjustment if the roller spring is worn or a
gap exists between the first and second folding
rollers, or it becomes impossible to score, slit, or per-
forate parallel to stock edges. Do not make this
adjustment until you are sure the paper guides are
parallel with each other, and that they are perpendicu-
lar to the folding rollers. You must also be sure the
paper is cut squarely. A crooked fold can be compen-
sated for by utilizing the fold table micrometer
wheels. (See Fig. 10 page 8)
To make the adjustment, insert the supplied hex key wrench
into the adjusting screw inside the right side cover. Clockwise
rotation will result in paper pulling more to the right.
Counterclockwise rotation will result in paper pulling more to
the left.
CAUTION: Excessive counterclockwise adjustment
may result in the screw leaving its station and falling
into the inside cover.
5.2.6 Timing Belt Adjustment
The timing belt may stretch as a normal process of operation
and the tension must be reset, or the tension must be set correct-
ly when installing a new belt. If the belt is set too loosely, it
may fall off. It it is set too tightly, it may stress the motor shaft.
Have a qualified service person check the line amperage. The
amperage should not exceed 3.2 Amps. To access the motor and
timing belt, qualified personnel should follow this procedure.
1. Disconnect power to the machine.
2. Remove the speed control, pump motor switch, hand wheel,
the circuit breaker, and the six right side cover mounting
screws. Remove the cover.
3. The fold motor is located on the inside of the right main
frame with the motor shaft extending through the frame. The
motor is held in place by four screws that extend through
the frame. The timing belt connects the motor pulley with
the 60T timing pulley located on the main drive roller.
Loosen the four motor mounting screws. Set the belt tension
with a belt tension gauge. If a gauge is unavailable, set the
tension so the belt deflects about 1/4". Reinstall the cover
and components in reverse order.
5.3 Machine Alignment
CAUTION: This procedure, sometimes referred to as
field alignment, should be performed only by qualified
service personnel.
A number of reasons may cause misalignment, including tam-
pering, machine relocation, or excessive wear. Correct align-
ment is essential for successful operation of the folder. See
Section 2.0 to orient yourself to the areas referred to in this pro-
cedure.
CAUTION: The paper used for this alignment is
important. 20# or 24# bond is ideal. The paper should
be straight and parallel on the long edges, and per-
pendicular to the sides. Use of paper that has not
been cut accurately may result in misalignment.
Sheets used during this alignment should not be
reversed or turned over. Always use the same edge of
the sheet as the lead edge. Failure to follow this pro-
cedure may invalidate the alignment process.
5.3.1 Neutral Position
To begin the alignment procedure, first set the machine to a
neutral position according to the following procedure.
1. Place the folder on a flat, level work surface or stand. Check
the base plate to make sure all four pads are in place.
2. Thoroughly clean all four folding rollers according to
instructions in Section 5.1.3.
3. Install both fold tables with the closed/deflector end toward
the folding rollers.
4. Lift the sheet detector to its top position and lock into place.
5. Loosen the left and right locking nuts on the turnbuckle
assembly.
6. Install the feed table but do not connect the air hoses.
7. Set the paper guides to maximum paper width.
8. Connect the turnbuckle assembly to the feed table.
9. Adjust the turnbuckle so the top front of the air block con-
tacts the bottom of the feed table.
10. Set the paper guide cross shaft on the feed table to the cen-
ter of the 5/8" slot and lock into position.
11. Insert the provided hex key wrench through the hole in the
right side cover and into the alignment adjusting screw. Turn
the adjusting screw until there is no pressure on the spring
adjustment. (The spring exerts pressure on the second fold-
ing roller.) Turn the set screw 3 1/2 turns clockwise.
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