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The mechanism described hereinafter and illustrated in the sketch permits automatic insertion of the paper into a typewriter so as to leave a top margin of a predetermined or preset amount.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
68% of the total text.
Page 1 of 2
Index Auto Paper Feed
The mechanism described hereinafter and illustrated in the sketch permits
automatic insertion of the paper into a typewriter so as to leave a top margin of a
predetermined or preset amount.
When the paper bail arm 10 is pulled towards the operator, a U-shaped trip
bell crank 11 having a depending tang 11A is cammed upwardly about pivot pin
11B. An arm 11C on the trip bell crank 11 engages a cam surface 12A of a pin
setter bell crank 12 which has a vertical axis at pin 12B. The cam surface 12A
engaged by the arm 11C causes clockwise rotation of the pin setter bell crank
12, causing a yoke-like extension 13 on the pin setter bell crank to engage a
geared sleeve 14 (behind the toothed pin wheel 18), causing the sleeve to move
towards the pin wheel 18. The geared sleeve 14 has a radially extending arm 15
which acts as a pin setter, causing it to displace one of the pins 16 which projects
through the pin wheel 18, so that the pin is exposed on the outboard side of the
The pin wheel 18 is connected to the platen by gear 17, and the depending
tang 11A of the trip bell crank 11 has caused the linkage to the linkage 19,
connected to the index interposer, to commence ratcheting of the platen by the
ratchet 20 and pawl (not shown) connected to the conventional carriage return or
platen-indexing mechanism. This effects rotation of the pin wheel until the
projecting pin 16 strikes a trip lever 21 on the trip bell crank 11, forcing it