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used on Model BETs
Grove used on Models
01
and A ETs
RH
Platen Shaft Bushing
Compression Spring
Figure 39. Universal Platen
The holding collar that prevents platen end play is located
next-to the left hand knob. A plain collarunder spring tension
is assembled on the platen shaft next to. the right hand platen
knob.
When the universal platen is initially installed, it is necessary
to adjust the right hand knob for the desired length. A re-
designed detent release lever must also be installed to avoid
interference between parts.
Pin Feed Platen
The pin feed platen available for the Model BET in 12", 16",
20" lengths provides a metho'd of feeding multiple-copy forms,
with carbon paper interleaved, through the typewriter. Re-
tractable pins are mounted in pin wheels at each end of the
platen cylinder. These pins engage holes along the edge of
the form and cause it to feed as the platen rotates. The pins
also serve to keep the parts of the form aligned or in reg.ister.
Feed fingers hold the form against the pin wheels to insure that
the pins engage the holes in the form properly. Each pin wheel
is adjustable to permit the pins to protrude just above the front
paper scale. An anchor rod, mounted to the paper table in
place of the copy guide, maintains the pin wheels in their
proper position.
Rubber covered platen cylinders are available corresponding
with platen numbers 1, 4,and 6. Cylinders are avai lable in
different lengths, measured between the pins, to accomodate
a variety of form widths.
The platen ratchets are the same as those used on the standard
platen and include the platen variable button to permit repo-
sitioning of the form to the writing line.
During operqtion the 'feed roll release lever must be in the
forward or released position. The form is fed by the pins and
misfeeding results if the feed rolls are engaged. A detent
spring is installed to hold the feed roll release le~er in its re-
leased position.
18
Card Holding Platen
The card ho.lding platen provides a means of holding cards so
that the operator may more easily type near the card's edge.
A metal insert in the platen provides an opening which receives
the card and clamps it in the platen.
An adjustable stop positioned l~terally along the metal insert
provides a means of locating cards at the correct typing po-
sition.
Card Positioning PI.aten
The IBM card positioning platen adaptable to the 12" Model
Bl ET is used for rapid feeding of I BM cards into and.out of
the typewriter. It is a number 1 platen equipped with a 44
tooth ratchet. A metal card holding bJade, containing an
adjustable card guide runs the full length of the platen. A
left hand platen knob, approximately 21/2" in diameter pro-
vides an efficient method of positioning the platen. A down-
ward hand motion on' the knob feeds the card toa predetermined
writing line. Rotation of the platen is stopped by an adjust-
able radial stop located on the left end 6f the platen shaft.
An upward hand motion on the knob causes the card to be
ejected from the platen and indexes the platen so that the card
holding blade is in position to accept another card. The left
hand knob contains a clutch which allows the knob to continue
turning when the platen reaches its stops, thereby eliminating
undue wear or parts breakage.
Clamp-Type (Waybill) Platen
"
The Clamp ... Type (Waybill) Platen offers a fast front· feed by
means of a clamp which opens to accept either a single card.
or a multiple part form of maximum .093" thickness and maxi-
mum width of 9 inches. As the platen is rotated downward,
the blade closes and the bottom 1/4" of the form is held se-
curely i'n the typ.ing position.
This platen is available with #1, #2, and #3 rubber hardness
for all 12" Model BET's with fabric or carbon ribbon feed.
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