Loading patent…
AssigneeRealty & Industrial Corporation
InventorsWilliam S. Gubelmann, deceased, by Walter S. Gubelmann, executor, William R. Grier
Estimating the term…
A desk top justifying text writing composing machine including automatic encoding and reading control means for operating a desk top justifying reproducing machine, or for operating larger and more sophisticated printing machines capable of automatic justification. The machine will produce unjustified typed lines and will automatically encode for controlling another machine to print justified lines, as a result of a single series of manual keyboard composing operations and automatic code controlled reproducing operations for producing a justified copy of a literal text, respectively. A differential character and space key lock means prevents operation of character and space keys that would extend a line beyond the right hand margin, and this means is appropriately effective to permit the addition of any character or space that will still fit in the line at any given time. The arrangement also accounts for the difference in character sizes for each key in upper and lower case conditions.
A differential key lock mechanism for a composing machine including a carriage wherein groups of proportional character and space keys have allocated thereto different numbers of spacing units, comprising key lock means for differentially locking the character and space keys in said groups, amount left in a line measuring means for ascertaining the number of spacing units left in a line ahead of a predetermined right margin, indexing means for controlling said key lock means according to the number of units left in a line, actuating means connected to said indexing means for rendering said indexing means effective, counting circuit means responsive to said amount left in a line measuring means and connected to said actuating means for operating said indexing means in accordance with the amount left in a line whereby said key lock means block against further operation of any of said proportional character and space keys which have a space unit requirement exceeding the number of space units remaining in a line while at the same time permitting operation of other said proportional character and space keys.
A differential control system for a composing apparatus including a text display, wherein groups of character keys have allocated thereto different numbers of spacing units on said text display, and means responsive to operation of said keys for advancing a print point on said display by a number of said units corresponding to the character of the operated key, means for determining the number of spacing units in a given text display line between the print point and a determined right margin of said text display, and means inhibiting the composition and the display of any character corresponding to a number of units greater than said determined number and, at the same time, not inhibiting the composition and the display of any character corresponding to a number of units less than said determined number.
A differential key lock mechanism for an electric typewriter or a composing machine having a movable carrier with an associated print point and a right margin wherein groups of proportional character and space keys have n or less proportional spacing units allocated thereto, comprising:
Dependencies are inferred from the claim text.