|
The teleprinter-reperforator is a telegraph machine which has been developed
to perform the duties of a teleprinter, a reperforator, and a perforator.
The machine is basically a standard page Teleprinter No. 7B or E fitted with
a saw-tooth keyboard, transmitter, and answer-back unit as
used on the Teleprinter No. 11, together with a perforating mechanism
similar to that used on the Perforator No. 45.
The facilities provided by the machine are as follows:-
- Teleprinter working; manual transmission with a
page-printed record of local or incoming signals. The
perforator section is rendered inoperative by manually moving a
'perforator throw-out' lever to the left.
- Reperforator working; producing fully punched tapes in addition to
Page-Printed records. The perforator unit is brought into use by moving
the throw-out lever to the right, and produces punched tape for all
signal combinations except:-
(i) 'Who are you' and /Bell', the preceding figure shift is perforated
tut the 'WRU' or 'Bell' combination is suppressed.
(ii) 'Answer back', the perforator is suppressed throughout the period
when the machine answer-back unit is controlling transmission.
- Perforator working; the machine is worked in local and works as
outlined in (b).
- A RUN-OUT key; this provides for the continuous transmission of any
character.
- A BACK-SPACE key; this provides for the cancellation of punching
errors by over-punching with the "letters" combination, that is five
mark code elements.
OUTLINE: OF OPERATION
The perforator mechanism is situate:- to the left of the keyboard as in the
Reperforator No. 45 and is controlled by a system of levers and five Bowdon
cables from the teleprinter combination head, and an extension from the
traversing link in the receiving cam-unit.
|