Punch Check Brushes; Punch Non-Process Run-Out; Stop Key Operation; Card Jam Circuits - IBM 1402 Instruction & Reference Manual

Card read-punch
Hide thumbs Also See for 1402:
Table of Contents

Advertisement

Punch Non-Process Run-Out
The NPRO key is used to clear the punch feed of
cards. Cards must be removed from the punch hopper
before this key is effective.
OBJECTIVE: start a punch feed cycle by using the
NPRO key.
1. (9B)
The punch NPRO key (No. 10 will pick
R29 and HD2 through the interlock contacts, R21-1N,
chip switches, and the punch switch. The punch feed
motor will start with the above relays energized.
2. (llA) The punch NPRO (No.2) picks R31 hold
coil through R27 - 2N and turns on the punch stop light.
3. (lOB) R27 is picked as normal.
4. (12A) - T Not Process Punch line is condi-
tioned by R31-3T, R27-4T, PC4, PC3, andPL6. The
1401 will then condition the - T PUNCH CLUTCH
MAGNET line and energize the punch clutch.
5. The check reset key must be usedtodrop out
R31 (Refer to Card Jam, steps 5-7).
stop Key Operation
OBJECTIVE: Allow the punch feed to stop when the
stop key is pressed.
1. (3B) The stop key (No.1) will open the circuit
to R29 and HD2 (lOB), causing the punch feed motor
to stop.
2. (6B) DU3 will be picked the same as described
under Read Stop Key Operation.
3. (9B) DU3-BU will keep the circuit to R29and
HD2 open after the stop key has been released.
4. (5A) The start key will drop out DU3 through
the use of the + U Interlock Stop line from the 1401
(6A).
Card Jam Circuits
A card jam or misfeed is detected by the card lever
relay points (llA). When a feeding failure is detected,
the punch feed will be stopped.
OBJECTIVE: stop the punch feed if a jam or misfeed
is detected.
1. (12A) R31, the punch stop relay is picked
through the card lever relay points and PL 7. The - T
Punch Jam line is conditioned at the same time. If
any delay relay picks when they should not, or any
card lever relay fails to pick. then a circuit is avail-
able at PL7 time.
2. (llA) R31 will hold through R31-1 T and the
card lever relay points to ground. It can also hold
through DU4-BL to ground. The punch stop light is
turned on in parallel with R31 hold.
3. (9B) R31-2N opens the circuit to R29andHD2.
The punch feed drive motor will stop.·
4. The cards must be run out of the feed by use
of the NPRO key and then the check reset key must
be used to restore the punch feed to an operating
status.
5. (5B) The
check reset key will pick DU4
through R28-3T and R7-3N.
6. (llA) The DU4-BL point opens the hold to R31
11-4
and turns off the punch stop light.
7. (llA) The DU4-AL point conditions the
+
U
Read Check Reset line to the 1401.
Clutch Check Circuit
Each time the punch clutch magnet is energized, R30
is also energized. If the punch feed clutch magnet re-
ceives an impulse and fails to pick. or a clutch cycle
is taken without the clutch receiving an impulse, R30
signals a clutch failure.
OBJECTIVE: Stop the punch feed drive motor.
1. When the clutch receives an impulse and fails
to unlatch.
a. (12A) R30 is picked by the - T Punch Clutch
Magnet line from the 1401 and the CB's.
b. (lOB) RIO holds through PL4.
c. (12A) R31 is picked by R30-4T, PC5, and
PL6.
d. (9B)
R31-2N opens the motor relay cir-
cuit, stopping the punch feed motor. The cards
must be removed from the feed and the check
reset key pressed to restore the punch feed to an
operating status.
2. When the clutch unlatches without receiving an
impulse.
a. (12A) R30 will not pick.
b. (12A) R31 is picked through R30-2N and
PL 7.
This circuit also conditions the - T Punch
Jam line which will stop the punch feed through the
1401 circuitry.
c. (9B)
R31-2N opens the motor relaycir-
cuit, stopping the punch feed motor. Removecards
from the hopper and press check reset key to
restore punch feed to operating status.
Stacker Select Circuits
1. (llB) The stacker card lever picks R37 any-
time a card enters the transport unit from the punch
feed.
2. (12B) R35 will pick on every punch-feed cycle
between times that the stacker card lever is made
through R37-3N and PL15.
3. (12B) R35 pick coil has a holdafterR37 picks
through R35-2T, R37-3T, R35-1T, PC6, and stacker
card lever.
4. (llB) R35 hold coil can energize if the
+
U
Stacker Inhibit line becomes active.
5. (llB) The stacker control relays are picked
by the
+
U stacker 4 or 8 from the 1401. R33 or 34
will then hold through PL14.
6. (12B) The stacker 4 magnet is picked through
R33-2T after R35 has dropped and the stacker card
o
0
lever has closed by PC6 time at 35 to 75 .
7. (12B) R31 will pick through R37-2N and
R32-4T if a card was at the punch check brushes but
did not reach the stackers on the next punch-feed
cycle.
8. (12A) R31 will pickthroughR35-4Nand32-4T
if a punch cycle is taken after a card has been at the
punch check brushes and stacker inhibit (R35) fails to
pick.

Advertisement

Table of Contents
loading

Table of Contents