US571757A

US571757A - Type-writing machine

Info

Publication number: US571757A
Authority: US
Priority date: 1895-03-19
Filing date: 1895-03-19
Publication date: 1896-11-24
Anticipated expiration: 1913-11-24

Description

(No Model.)

' W. G. FARNUM. TYPE WRITING MAGHINB.

N0. 571,757. Patented Nov. 24, 1896.

IEIE. E-

INX ENTSR WILLIAM G-E ALRNUM WITNESSES UNTTED STATES WILLIAM C. FARNUM, OF

ATENT Trice,

ARLINGTON, VERMONT.

TYPE- -WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 571,757, dated November 24, 1896. Application filed March 19, 1895. Serial No. 542,343. (No model.

To all 1071,0111, it may concern:

3e it known that 1, WILLIAM C. FARNUM, aeitizen of theUnited States,residing at Arlington, in the county of Bennington and State of Vermont, have invented certain new and useful Improvements in 'lypeJVriters, of which the following is a specification.

My invention relates to that class of typewriters in which a movable paper-carriage is used; and it consists of suitable adjustable stops for regulating the movcm ent of said carriage and a cooperating alarm-bell, as hereinafter described. As in the class of type-writers referred to the extent of movement of the paper-carriage determines the length of the written line, I propose to provide in this machine for the quick and easy adjustment of the stops which limit said carriage movement to the varied length of line required. I also attach to and operate in conjunction with one of the stops an alarm-bell, which warns the operator of approach to the end of the line.

The device is shown in the accompanying drawings, of which- Figure l is an end elevation of the upper portion of a type-writer, showing the papercarriage and the stop carrying the alarm-bell. Fig. is a plan view of the stop and alarm mechanism, showing a small portion of the movable carriage. Fig. 3 is a side elevation of one of the margin-stops and its rack, in connection with the cooperating striker of the carriage. Figs. at and 5 are end elevations of the parts shown in Fig. 3. Fig. 6 is a rear elevation, partly in section, of the parts shown in Fig. 2, taken on the line X Y, Fig. 2.

Similar letters refer to similar parts in the several views.

In the drawings, A is the base or frame of the machine, and B is the movable carriage, which in this case is carried on the rollers E and F. The position of the keyboard is indicated by the key B. A forward impulse or movement in the direction of the arrow 0, Fig. 2, is given the carriage at each key depression. Attached to the stationary base or frame A is the toothed rack G, which supports the margin-stops G and N, and by means of which rack said stops may be held at any required position within the length of said rack. The stops G and N are toothed to en gage with the toothed rack, and the teethare arranged to be disengaged and the stops to be moved longitudinally on said rack for adjustment, as hereinafter described. The stop N also carries a bell-supporting top plate ll,

thickened at its inner end to serve as a counterbalance to the bell J, which is secured below the plate at its outer end by the screw j. A bell-clapper K is hung on a pivot P, which pivot finds its top bearing in the plate H and its bottom bearing in. a projection a, Fig. (3, of the stop N. The hub of the bell J is grooved across its top end for the reception of a spring L, Fig. 2, which spring is held in position by the top plate ll. At its opposite end the spring L bears against the bell-clapper and holds it normally in the position shown in Fig. 2. The tension of this spring maybe varied by turning the bell around the screw j.

The movable carriage is provided with a striker D, adapted to impinge against either of the margin-stops G and N and to check the carriage movement as either end of the rcquired line is reached, but at the same time permitting the optional raising of the marginstops and the continuation of this movement beyond the fixed limit of the line and also permitting the free return of the carriage within the limit of said line without disturb ing the setting or adjustment of the stops. The carriage also carries one or more pins M M, which are so located as to operate the bellclapper shortly before the end of the line is reached as the carriage moves in the direction of the arrow 0, Fig. 2.

In practice the margin-stops are set to de termine the length of line as follows: The finger is pressed downward in the recess 71-, which is provided for the purpose on stop G. This brings the step into the tilted position shown in Fig. 5, when the teeth I'- of the step are raised out of engagement with the teeth of the rack 0, thus permitting the sliding of the stop to any point on the rack, providing it does not pass the striker D, which it cannot do when in this tilted position. The stop G is provided with an inwardly-projeoting lip Z, which when the stop is tilted to disengage its teeth strikes against the lower face of the rack O and, sliding freely thereunder, prevents the further tilting of the stop. The

lOO

normal and fixedposition of thestop with its teeth in mesh with those of the rack is shown in. dotted lines in Fig. The stop IT is constructed and operated similarly to the stop G, as far as its adjusting and retaining features are concerned. In depressing the stop N, however, the top plate is grasped instead of the finger-piece 7L on the stop G. As when the machine is writing the carriage moves in the direction of the arrow or from right to left, the carriage preparatory to writing is propelled to the right till the bottom portion of the striker D strikes against the projecting lip g of the stop G, shown in Fig. As the writing progresses the carriage moves in termittently in the direction of the arrow till striker D reaches the position shown in dotted lines in Fig. 2, which is shortly before the terminus of the line is reached. The leading one of the pins M M now engages the pro ,jecting lip K of the bell-clapper and swings the clapper into the dotted position shown. Further movement of the carriage releases the clapper, which is swung back by the spring 1 with sullicient momentum. to carry said clapper past its normal position and into impingement against the bell, when, its n10- mentum being checked, it is returned by the spring to its normal position. This belltapping is repeated by the next pin. A continuanee of the carriage movement causes the lower portion of the striker D to strike against the projecting lip 11 of the stop N and check further movement. The carriage may then be returned to its former position, bringing the striker D into contact with the stop G. If, however, it is desired to continue the movement of the carriage beyond the limit of either margin-stop, this maybe done by tilting the stop after the striker D has reached the position of impingement thereagainst till the top of the projecting lip g of stop G or n of stop N strikes the lower surface of the projecting top plate (Z of the striker D, as shown in full lines in Figs. 3 and i. The striker D is now free to pass the stop as the projecting lip g or 7L slides through 1 he groove 1) in the striker D provided therefor. The projecting top plate (Z prevents the stop from tilting sufficiently to disengage its teeth from those of the rack, thereby effectually locking the stop for as long a time as its lip remains within the groove of the striker D. As the striker-D passes beyond it the stop drops to its normal position, and as the striker repasses the stop 011 its return it lifts crate the bell.

to the starting-position fora newline the DIES the stop by means of the beveled lip gin the i case of the stop G, as shown in dotted lines,

Fig. 0, or the beveled bottom edge of the bell-clapper lip K on stop N, so that the ;ll repasses through the groove in the striker D. as before.

The bell-clapper lip K 011 stop N projects slightly beyond the lip n, so that the pins AI M may pass the lip a and strike the lip K to up- As the carriage is returned M M pass under and lift the lip K.

The teeth of the rack C may be made or a pitch equal to the space of one letter on :he type-writer. Then the lips g and n may be made of such width that the carriage when checked by said steps will always be at :he neutral point between two of the said letterspaces, when the teeth and stops are so :1rranged that the teeth on the rack may oe numbered, as shown in Fig. 2, for convenienoe in counting the number of letters in a line in setting the stops.

Having thus described my apparatus. 1 claim as my invention, and desire to secure by Letters Patent, the following:

1. In a type-writer the combination with a toothed rack of a margin-stop having teeth adapted to engage with those of the rack. means for tilting said stop to effect disengagement and a rigid retaining-lip on said stop to check the tilting of same when the teeth have swung out of engagement and allow the stop to be slid lengthwise of :he rack, substantially as specified.

2. he combination of the tilting stop with the carriage carrying the striker provided with the groove for permitting the striker :0

pass beyond the said stop at will, and the top plate for preventing the tilting of the said step for disengagein entwhen. such movement is unnecessary, substantially as described.v

The combination of the grooved striker D attached to the movable carriage and the stops G and N beveled on one side so as o slide through said grooved striker in one direction and strike against same in opposite direction, substantially as described.

4:. The combination with the alarnrbell of a type-writer of the clapper K the spring L and the adjusting-screw j upon which the bell maybe turned to tighten the sprin su o stantially as specified.

In testimony whereof I have hereto subscribed my name this lUth day of March. 1895.

WILLIAM C. FARNUM.

In presence of FRANKLIN Scorr, EMILY Scorr.

ZIO