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Signature
rolling off crease
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a.
Vacuum pump or pocket valve off.
b.
Bottom support at station too far back.
c.
Signatures too soft and/or flimsy.
d.
Signature not pulled down
by suction cups.
e. Plate not far enough into signature when released.
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a.
Turn vacuum pump/pocket valve on and/or verify that it is on.
b.
Move bottom support forward in station.
c.
Recheck all setup steps and setup to close tolerances.
Consider using brushes on front of vacuum cover plates at station.
d.
See next problem and
solution.
e. Adjust vacuum release point cam.
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Signatures
not pulled down by vacuum cups
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a.
Heavy weight signatures or vacuum too low.
b.
Unused vacuum cups not plugged, low vacuum.
c.
Signatures held too tight in pocket.
d. Too many signatures in station.
e.
Backstop not against pile.
|
a.
Adjust regulator to provide slight increase in vacuum level.
b.
Install plugs into unused (open) vacuum cups.
c.
Move station back slightly for about 1/32” clearance along width
of signature and make sure you have some side-to-side play.
d.
Remove some signatures from station.
e.
Release and slide backstop
onto pile.
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Problem
feeding signatures after jam is cleared
|
a.
Signature plates are out of position, out-of-time.
b.
Picker fingers bent.
|
a.
Reset clutch and/or retime feeder.
b.
Replace and/or adjust.
|
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Signatures
missed or torn, not opening for plates
|
a.
Signature upside down in pocket.
b.
Air not turned down to unused stations, air jet too low.
c.
Air tube clogged.
d.
Signature not folded correctly.
e.
Lip support too far out, lower leg catching on it.
f.
(Only with openers) fingers may not be returning home.
g.
(Only with openers) fingers
are too far out. Possibly
beyond leading edge of lip support.
|
a.
Check all signatures in stack and reposition as needed, long leg
up, crown facing front station.
b.
Turn down air to unused stations, reduce vacuum.
c.
Clean air tube exit port on pocket table.
Do not to enlarge opening.
d.
Remove incorrectly folded signature from stock.
e.
Readjust as needed. Typically
the lip support should extend about 1/16” less than the short leg of
signature.
f.
Check and/or adjust as indicated in section 5., SERVICE, PICKER
ASSEMBLY.
g.
Readjust picker assembly so
fingers are about 1/16” from lip support.
|
|
Signatures
not placed correctly on saddle.
|
a.
Feeders too far away from
saddle, out of time with stitcher or overload clutch not reset correctly.
|
a.
Follow instructions in
section 6, TROUBLESHOOTING and section 5., SERVICE.
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|
Sneakers,
additional signatures pulled off crown springs.
|
a.
Too much space between crown spring skis and signatures.
b.
Stock pile weight too heavy.
c.
Station bottom support springs out of position or more required.
d.
Paper porous, more than one signature sucked down.
e.
Crown springs weak or broken.
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a.
Readjust station back to reduce space.
b. Excessive weight
causes the signatures to push extras past crown
springs. If this occurs,
remove some signatures to reduce weight.
c.
Move station bottom supports upward or use additional springs.
d.
Replace standard vacuum cup S-1481 with smaller cup S-1482 or
reduce vacuum. Maybe raise table slightly.
e.
Replace defective crown springs.
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