US2471757A - Line producing device for typewriters - Google Patents

Description

May 31, 1949.

M. G. LEMOS LINE PRODUCING DEVICE FOR TYPEWRII'ERS Filed March 13, 1948 f \lllli ollll b! INVENTOR. MA Nt/EL 6. A EMOS A 7' TOR/VEY Patented May 31, 1949 UNITED STATES PATENT OFFICE LINE PRODUCING DEVICE FOR TYPEWRITERS Manuel G. Lemos New York, N. Y. Application March 13,1948, Serial No. 14,717

2 Claims. 1

This invention relates to an improved typewriter, and one of its objects is to provide a typewriter with means for causing a printing type bar to rapidly produce marks against the paper or work mounted on the platen of the typewriter, by manually holding the printing type :bar in printing position and then manually shifting the carriage, which is equipped with means for vibrating the engaged type bar so that it will rapidly print against the paper or work, and thus produce a continuous line of marks or dots, depending on the nature of the type or printing surface of the active type bar.

Another object of the invention is the pro- Vision of a typewriter carriage with a horizontal rack and a type bar having a striker or lug which engages a tooth on this rack, the rack being formed with bevelled teeth so arranged that when the striker or lug of the type bar is manually forced to printing position the rack will be engaged by the striker or lug, and by holding the type bar in printing position and rapidly moving the carriage to the left, the bevelled or inclined teeth of the rack will successively force the striker or lug outwardly from printing position, the type bar and striker being manually returned to printing position by the finger pressure main tained upon the same, so that the type bar is caused to vibrate toward the platen and print a line of similar marks on paper mounted the platen.

With the above and other objects in view the invention relates to certain new and useful constructions, combinations, and arrangement of parts, clearly described in the following specification, and fully illustrated in the accompanying drawings, in which:

Fig. 1 is a top perspective view of a typewriter provided with the improved rapid line marking means.

Fig. 2 is a transverse vertical sectional View, taken on line 22 of Fig. 1, looking in the direction of the arrows, showing the marking type bar and the vibrating rack bar.

Fig. 3 is a detail side elevation of a combined scale and rack bar.

Fig. 4 is an edge view thereof.

Fig. 5 is a detail cross sectional view, taken on line 5-5 of Fig. 3, looking in the direction of the arrows.

Fig. 6 is a detail perspective View of a modified form of the vibrating rack.

Referring to the accompanying drawings, which illustrate the practical embodiment of the invention, l0 designates a typewriter, of the type generally known as a portable typewriter, but which may be a standard typewriter, and of any make. This typewriter is provided with the usual carriage l having a rotary work platen l2. The carriage is released for manual shifting along its tracks, of conventional construction, by means of the release lever 23, also of conventional design and installation.

In front of the platen 52 a horizontal scale I4 is mounted, and on this scale a rack 15 is secured or formed. This rack is formed with a plurality of equally spaced teeth It, and each tooth is formed with a bevelled or inclined side face I5a and a release straight side or end face I51), and is of the type generally known as a ratchet rack tooth.

The typewriter is also provided with a plurality of type bars l1, each of the usual construction. One of these type printing bars I1 is provided with type printing elements l8, which may be in the form of small period dots or otherwise. This bar I! is also formed with or provided with a striker lug 19, which normally projects upwardly, when the type bar is resting against the basket rest bar 20.

When the user of the typewriter desires to produce a line composed of a series of similar marks or dots, he or she forces the type printing elements It against the paper 2|, around the platen l2, with the finger of one hand, and with the other hand releases the carriage II, by operating the release lever l3, and then moving the carriage to the left.

Due to the fact that the printing elements [8 will be held manually toward the platen, the striker lug [9 will be disposed against the rack bar it: of the scale Hi. As the carriage is shifted to the left, the rack bar teeth IE will be successively engaged with the striker lug l9, thus vibrating the printing bar 17, due to the pressure maintained on it by the operator.

As a result of this vibratory action, the printing elements it will be alternately displaced from pressure engagement with the work sheet or paper 2!, and then moved into printing engagement with the paper. When the sloping faces or bevelled side faces liia of the teeth l6 engage the striker lug IS, the printing elements l8 will be moved away from the platen, and when the striker lug l3 rides off these inclined 0r bevelled side faces, and drops or moves against the right angular end faces l5b, to engage the lowest part of any bevelled side tooth face, the printing elements l8 will be pressed against the printing or work sheet 2!, so as to produce a dot or mark.

The rack bar ma be formed on the scale bar, or may be welded or otherwise secured thereto. It may also be formed from the material of the scale bar, by bending or offsetting the edge portion thereof, as indicated at 15 in Fig. 6.

My invention thus provides a simple means for rapidly producing lines of similar marks on the Work sheet of a typewriter platen, by merely pressing an" equipped printing bar toward the platen, and then shifting the carriage, with the platen, to the left, so that the displaced printing bar will be vibrated and will produce a series of similar marks in a straight line across-the-work sheet.

It is understood that the invention may be applied to any make of typewriter, whether port'- able or standard, without changing theexisting mechanism of the machine, and may be applied to any type of printing bar suitable for line marking.

It is also understood that various changes may be made in the details of construction, their combinationand arrangement, without'departing from the spirit of the invention, as defined in the claims hereof.

Having described the invention, I claim as new:

1'. A typewriter having a sliding carriage provided with a platen, a scale bar carried by the carriage and located below the platen thereon, a seriesof ratchet teeth disposed on the scale bar, and a printing bar pivotedto move toward and away from the platen and provided with a striker lug projecting from the normal upper edge thereof to engage the ratchet teeth, the ratchet teeth being adapted to vibrate the printing bar when the same is held toward the platen by finger pressure and the platen and carriage are manually shifted to cause the ratchet teeth to successively displace the printing bar from engagement with the platen.

2. A typewriter having a sliding carriage and a rotary platen thereon, means for controlling the position of the carriage, a scale bar located on the carriage below the platen and provided with a rack bar having inclined ratchet teeth, and printing means carried by the typewriter to engage the platen and the teeth of the rack bar and adapted" to be vibrated by said teeth when the carriage is shifted and the printing means is held-in printing position against the platen.

MANUEL G. LEMOS.

REFERENCES CITED The following references are of record in the" file of this patent:

UNITED'STATES PATENTS Number Name Date 904,857 Ferguson Nov. 24, 1908' 904,859 Ferguson Nov. 24:, 1908' 1,079,548 Fengler et a1. Nov. 25, 1913

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