The IBM Reproducer - IBM 1401

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Figure 17.PUNCH UNITNew masterserial number cardI10th cardof groupFeed HopperStackerFigure 18.IIcharacteristic, but allow punching for those without it. Or, it could beused to suspend punching for those which do not have it, but allowpunching for those which do. The manner in which it is to be used iscontrolled by a switch.The simplest characteristic by which one type of card can be distinguishedfrom other types is a hole in the 11th row of a chosen column.A hole in the 11th row is commonly referred to as an X punch.Assume that the master serial number cards have an X punch in column1. To suspend punching into the master card requires, then, thatthe X punch be detected belore the 12 edge o/ the master card gets tothe punch magnets.The detection of an X punch to suspend punching is accomplishedby a device called a Punch X brush. The Punch X (usually referred toas the PX) brush has been so engineered that it recognizes only an Xpunch. The schematic in Figure 19 shows the location of the PX brush.
PX brushPUNCH UNITFeed Hopper/PunchingDiesPunchBrushesStackerThere are six punch X brushes in an IBM 514. Each is removable so that it can be manuallyinserted over the column which contains the X punch.The distance between the punch magnet and the PX brush is equivalent to two rowsin length.Figure 19.When a PX brush detects an X punch, an impulse is available fromthe hubs located at P, 1-6 of the control panel. The timing of this impulseis significant. Generally speaking, when a hole is detected by abrush in the 11th row, the impulse generated occurs at 11 time. Figure20(A) shows a theoretical brush placed under the punch magnet readsan 11 punch at 11 time. If a review of timing is required, refer to page15 of Section 2, "The IBhl Sorter." Because of the IBM 514's design requirements,detecting an X punch at the PX brushes must generate animpulse that occurs at 13 time. The manner in which this is accomplishedis schematically illustrated in Figure 20, part B.The impulse from the chosen PX brush is connected to either one ofthe two joined hubs identified as PX and located at H,8-9. When the PXhub receives a 13-timed impulse from the master card, the punch magnetsbecome ineffective for one cycle as the master card passes them.12. What determines whether an impulse from the PXbrush is to be used for suspending punching or allowingpunching?*13. Where in relation to the ~unch magnets are the PXbrushes located?14. How many PX brushes are there?15. What is the timing of an impulse when a PX brush detectsan X punch?16. When cards with X punches are interspersed with cardswithout X punches, how are the X-less cards referredto ?
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