Patented Oct. 13, 1931 1,826,780

UNITED STATES PATENT OFFICE.

EDWIN L. HARMON, Of GROTON, NEW YORK, ASSIGNOR TO L.C. SMITH & CORONA TYPEWRITERS, INC, OF. SYRACUSE, NEW YORK, A CORPORATION OF NEW YORK TYPEWRITING MACHINE

Application filed September 25, 1928. Serial No.308,158.

This invention-relates to improvements in typewriting machines, and other type printing: machines having traveling paper- or platen: carriages: and more particularly, to carriage travel arresting means for such machines.

The invention has for its principal objects to provide an efficient adjustable carriage stop, and stop mounting; to provide an efficient. right, and left hand-margins determining means for typewriting means; to provide adjustable margin stops for limiting endwise movements: of a platen carriage which stops may be easily, and quickly, adjusted, will be sturdy and durable and efficient in use, and may be manufactured at low cost; and to provide a stop carrying bar and adjustable carriage stop device constructed for secure locking of the stop in different adjusted positions along the bar, and for easy release and adjustment of the stop by thumb or finger pressure on-a-part of the stop device.

To the above and other ends which will hereinafter more clearly, appear, the invention consists of the features of 'construction,arrangements: of parts, and combinations of devices set forth in the following specification and particularly pointed out in the appended claims.

For the purpose of illustration the invention has been shown in the drawings as embodied in a margin control mechanism for a portable; three-quarter, strike typewriting machine of the kind disclosed in the application of Avery, Petermann, and Harmon,Serial No. 148.258, filed November 13, 1926.

(now. Patent No. 1700,829, dated February 5, 1929) for arresting return movement of the carriage and for arresting advance of the carriage and locking the machine against operation. In the present instance the machines shown provided with a sheet, metal carriage, and carriage bed of the kind disclosed in the application of Ely, Serial No. 198,265,filed June 11,1927 (now Patent No. 1741,689, dated December 31, 1929).

In the drawings:

Fig. 1 is a rear view of the platen carriage and bed-of-the-machine looking: there at perpendicular to the normal plane of the rear face of the stop bar on the carriage;

Fig. 2. a top view of the parts shown in Fig.1 looking thereat perpendicular to the normal plane of the top face of the stop bar;

Fig. 3 a fragmentary sectional view on the line 3-3 of Fig. 4;

Fig. 4- a sectional view. on the line 4-4 of Fig. 1, the carriage and bed being shown tilted rearward at the angle-with the horizontal which said parts make-in the machine;

Fig.5 a perspective view showing the right hand margin control stop device locked on the stop. bar;

Fig.6 as view, showing...the parts of the right, hand margin control stop, device in perspective. and separated;

Fig. 7, a sectional view on the line 7-7 of Fig.2 showing the right-hand margin control stop device in locked position;

Fig. 8 a sectional view on the line 8-8 of Fig. 1, the carriage and bed being shown at the angle with the horizontal, which said parts make in the machine;

Fig, 9 a view showing the parts of the left hand margin control stop device in perspective and separated;

Fig.10 a sectional view on the line 10-10of Fig. 2 showing the left hand margin control stop device in locked position;

Fig.11 a sectional view on the line 11-11

Figs. 12 and 13 fragmentary sectional views showing slightly modified forms of the right and left hand margin control stop devices,respectively, said Figs...12 and 13 being taken on the same lines-as-Figs. 4 and 8, respectively; and

Fig.14 a detail view, showing the stop. bar oscillating lever.