At one stage in the development of margin control, this was done by hand, an awkward opereration where the stop mechanism was to the rear of the machine. The width of each margin is controlled by sliding the corresponding stop along the rack to the desired position and allowing a tooth on the stop, held against the rack by a spring, to engage an indentation between the teeth on the rack. Margin stops, on a bar or rack mounted on the carriage, halt the movement of the carriage by contact with a fixed post mounted on the frame, or, if the rack and stops are mounted on the frame, by contact with a fixed post mounted on the carriage. Both are designed for use on the so-called open-face machine, the type of machine in general use, which carries the margin stops and the bar on which they are mounted to the rear of the machine. 1,916,905 for an improvement in means of setting margins on typewriters, brings this action against defendant for infringement, by a margin control device of defendant, of Claim 3 of the Woodfine patent, which reads as follows: "In a margin regulator for typewriters the combination with a stop post, a carriage movable with respect to the stop post, a rack bar mounted on the carriage, a pair of stops slidable on the rack bar, and rack engaging catch members attached to each stop to normally secure the stops in set position on the rack bars, of spring mechanism tending to slide the stops toward one another, a pair of trip members operable to adjust the catch members to stop releasing positions, and extension keys attached to the shift members for actuating the latter from forwardly disposed positions."īoth the defendant's device and that of Woodfine provide for setting of margin stops by controls on the front of the machine easily accessible to the operator. Plaintiff, owner of the Woodfine patent no.
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