US2277277A

US2277277A - Typewriter

Info

Publication number: US2277277A
Application number: US288055A
Authority: US
Inventors: Tombolini Alfredo
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-07-08
Filing date: 1939-08-02
Publication date: 1942-03-24
Anticipated expiration: 1959-03-24

Description

March 24, 1942; A. TQMB NI TYPEWRITER Original Filed July 8, 1935 2 Sheets-Sheet 1 A. Tombolini:

arch 24, 142. A. TOMBOLINI TYPEWRITER Original Filed July 8, 1935 2 Sheets-Sheet 2 3mm A. Tombolini:

Patented Mar. 24, 1942 'rvrawarrsa Alfredo Tombolini, Milan, Italy Original application July 8, 1935, Serial No.

2, 1939, Serial No. 288,055.

2 Claims.

This invention relates to typewriters and more particularly to margin setting gear.

In order to secure an easier reading on the machine, easier manipulation-in replacing the inked ribbon, etc., the tendency is to-day to arrange the whole of the margin setting device at the back of the carriage or the back of themachine. However, when the margin stops are arranged at the back it is, in fact, very difiicult to find them and shift their position; the operator must proceed blindly and bygroping'. To make the typist work as easy aspossible, the margin'stops arranged at the rear have been Divided and this application August In Italy July 11,

rendered partially visible by means of windows provided in the paper table, or the paper table has been adapted to be raised or shifted horizontally. In some cases, the whole carriage has had to be shifted from left to right or vice versa in order to permit access to the margin stops.

With the margin-setting device according to the invention, all shifting of the carriage from the beginning to the end of the line is avoided as well as all swinging of the carriage lever, whilst all displacements that have to be effected blindly, and all other obstacles presented to the typist are also avoided. Y

The invention consists in a margin setting device for typewriters comprising a plurality of margin teeth or stops equal in number to the divisons of the paper scale of the machine, these teeth or stops being vertically slidable and arranged in two rows in guides'fixed to the machine, the lifting of any of these teeth or stops in order to retain the machine carriage being operated by two strips secured to the carriage, the said two strips being actuated by a third strip controlled by two keys, for example, by one key for the commencement of the line, and by another for the end of the line.

In the system according to the invention, after moving the carriage to the spot where the line is to begin or end, the ty-pist simply strikes a key provided atthe forward portion of the machine near the key board and the margin stop is instantaneously and automatically applied. This holds good both for the commencement and for the end of the line.. The automaticity of the device according to the invention is complete also for the reason that when another setting of the margin has been previously performed, when the said key isdepressed in order to replace the previous setting by-a new one, the margin setting tooth or stop that has been applied at another spot is restored into its rest position before the new tooth or stop is applied.

said margin teeth or stops arranged in their support, this support being shown in cross section,

Figure 5 is a perspective view of the margin setting devices mounted upon the support which is shown in cross section,

Figure 6 is a perspective view similar to Figure 5, but viewed from the head of the margin setting group, I

Figures 7 and 8 are diagrammatic views showing the different positions of the margin teeth or stops, and more precisely, while setting and after setting a tooth in operative position,

Figure 9 is a view showing the connection between the margin setting elements and the levers actuating them,

Figures 10 and 11 are views showing the actuation of the margin setting device for'the commencement and for the end of the line respectively, and

Figure 12 is a detail view of the carriage re-- taining device.

'In carrying the invention into effect the margin setting device comprises two rows of teeth or stops l5 and 15 arranged in an equal number of guides 86; these guides are in the shape of sheet metal strips ll fitted with saw teeth and fixed to a supporting casing I8. The teeth or stops I5 and I5 are slidable in vertical direction or, in other words, they can be raised against the'action of spring 50 lodged in the casing l8; the duty of the spring 5|] is to normally hold the teeth or stops l5 and IS in their lower or inoperative position.

The casing I8 is stationary, and is arranged at the rear portion of the machine. Beneath the casing l8 and, more precisely, along its longitudinal sides, angle irons l9 and 20 are provided.

Likewise beneath the casing l8 and, more precisely, opposite the teeth or stops I5 and 15' there is provided a support fixed to the car- .riage, this support carrying two strips 2| and swing on the said support. The strips 2| and 2| are subjected to the action of springs 21-21, which tend always to hold the strips in their lowered position.

them may always be'struck by the carriage side; after this the carriage side is held fast by the two teeth of the guiding strips H.

The arm 2301 lever 26 lies beneath the strips 7 2|, while the other arm 23 lies beneath the tooth or shoulder 30 of strip 2|. Between the shoulder 3| and the lever arm 29 a tongue 3| is interposed, this tongue being fixed to the end of two arms 3|, which are rigidly connected at 33 to a fork 32 adapted to swing about a fixed point of the machine.

On the head of the casing l8, two angle levers 42' and 43 are adapted to swing.

The two swinging strokes (to the right and to the left) of the fork 32 are determined by two teeth 33' and 34 adapted to swing respectively about 35 and 38; these teeth are actuated by

links

31 and 38 connected to two keys 39 and 40 provided in the front portion of the machine.

The striking of the key 39 operates the tooth or stop for the commencement of the carriage stroke; the striking of the key 40 operates the margin tooth or stop for the end of the carriage stroke, and this in the following manner:

When the key 40 is depressed (Figure the lever 3| actuates the arm 29 of the double-arm lever 26 and raises the other lever arm 28 which in turn raises the strip 2|. This strip 2| first actuates, by means of its tooth 23, the angle iron l9 and causes this iron to turn about its pivot; after this, the strip 2| actuates the margin tooth I5 and lifts it. The tooth |5 remains in its raised position in which it is held by a spring strip 4|; this spring strip 4| is suitably arranged in the casing l8 and engages a notch 42 of the margin stop l5.

When the key 39 is depressed, the lever 3| bears against the shoulder of the strip 2| and lifts this strip; the strip 2| thus lifted'actuates the margin stop I5 in the manner already described in connection with the margin stop IS, the stop l5 being held in its raised position by the spring strip 4| which engages a notch, similar to notch 42, formed in said stop.

For each letter space or each division of the paper scale of the machine, and consequently of the carriage, a margin tooth or stop is provided. If the machine has a carriage 80 spaces long, 80 margin teeth or stops will be provided for the commencement of the line and as many for the end of the line, the stops being arranged in two rows. I

If the carriage is brought, for instance, to the division In of the paper scale, by so doing the 'lOth margin stop is found (and lifted into operative position).

0n the other hand, if the carriage isbrought, for instance, to the division 20 of the paper scale,

the 20th margin stop will be lifted into operative position.

The margin teeth or stops both for the commencement and for the end of a line, remain in the raised position owing to the action exerted upon them by the tongues 4| and 4|.

As the commencement of the line takes place inone direction and the end of the line takes place in the opposite direction, the margin stops have an opposite directionin order that each of The lowering of a margin tooth or stop that has been lifted takes place automatically before another such tooth or stop is lifted into operative position, and is effected in the following man- The strip 2| or 2|" which serves to lift the margin tooth 'or stop I5 or l5, before reaching the stop, strikes against the angle iron l9 or 20. The angle iron thus receives the movement indicated in dotted lines in Figures 10 and 11. The end of the angle lever 42' or 43 now moves the spring strip 4| or 4| and the latter in consequence releases the margin stop which will be pushed away and will return into its position of rest with the assistance of the cross bars 5| and 52, which engage

notches

53 and 54 in the stops |5 and I5 and which are pushed downwards by the springs 50.

If desired, it is also possible to make inoperative a margin stop that had already been lifted, without lifting a new one, by displacing the angle lever 42' or 43 by hand, or by depressing the key arranged at the front, only half way.

This application is a division of application Serial No. 30,387, filed July 8, 1935.

Having now particularly described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A margin setting device for typewriters comprising, a carriage adapted for step-by-step movement, two rows of settable stop members adapted to coact with said carriage to limit the movement thereof, each row including stop members equal in number to the step movements of the carriage, the stop members of one row serving to limit the movement of the carriage in one direction while the stop members of the other row serve to limit the movement of the carriage in the other direction, guides supporting said stop members for vertical sliding movement from inoperative to operative position, separate members mounted on said carriage, one for setting the stop members of each of the two rows, manually operable keys, actuating means connecting said keys with said members, and resilient means for holding each stop member in operative position against accidental displacement.

2. A margin setting device for typewriters comprising, a carriage adapted for step-by-step movement, two rows of settable stop members adapted to coact with said carriage to limit the movement thereof, each row including stop members equal in number to the step movements of the carriage, the stop members of one row serving to limit the movement of the carriage in one direction while the stop members of the other row serve to limit the movement of the carriage in the other direction, guides supporting said stop members for vertical sliding movement from in operative to operative position, separate members mounted on said carriage, one for setting the stop members of each of the two rows, manually operable keys, actuating means connecting said keys with said setting members, means for locking said stop members in set position, means controlled by said setting members to release said locking means, and means operable upon release