US2605880A

US2605880A - Type bar rest

Info

Publication number: US2605880A
Application number: US203348A
Authority: US
Inventors: Ralph E Page; Ronald D Dodge
Original assignee: International Business Machines Corp
Current assignee: International Business Machines Corp
Priority date: 1950-12-29
Filing date: 1950-12-29
Publication date: 1952-08-05
Anticipated expiration: 1969-08-05

Description

A -5 19 2 R. E. PAGE ET AL 2,605,880

TYPEBAR REST Filed Dec, 29 1950 FIG. I

Snnentfis R. E [PAGE R.D.'DODGE G ttomeg Patented Aug. 5, 1952 2,605,880 1 "TYPE BAR REST Ralph" E. Page, Lagrangeville, and Ronald D.

Dodge, Poughkeepsie, N. Y., assignors to International Business Machines Corporation, New

York, N.'Y.', fa corporation of New York 7 Application December 29, 1950, Serial Nutrients 6 Claims. (Cl. 197- 42) I This invention relates to typewriting machines.

"The principal object of the inventionis to provide an improved rebound pad and type bar rest.

An object is to provide a rebound pad and rest which not only reduces rebound to an insignificant amount, but also makes the typewriter considerably quieter in operation.

An objectis to provide a type bar rest and rebound pad which is suitable for power operated typewriters.

An object is to provide a rebound pad and rest which floats in the typewriter basket and is weighted to compensate for the difierent rebound tendencies of the type bars at the end of the basket.-

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompany drawings, which disclose, by way of examples, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. l is a front view of the type rebound pad.

Fig. 2 is a vertical section on the line 2-2 of Fi 1. r

The rebound pad comprises an assembly which is mounted so as to float on two pins ll] which may be secured to and form part of the type basket of a typewriting machine, the invention being particularly suitable for use in power operated typewriters. The framework of the type bar rest consists of a formed strip H preferably of stiff sheet steel curved in an are which is approximately concentric with the printing point on the platen and concentric with the array of type bars in the usual segment (not shown). In the drawings only the two center and end type bars l2 are shown.

The formed strip l l is shaped with the lugs l la, l lb which serve to retain in place the rebound pad which, in the present case, is composed of three strips 13a, l3?) of a resilient material such as the plastic Vinylite. The two strips ltb are of about the same width as the main part of the metal strip ll and are snugly retained between the lugs lla at the sides and the lugs llb at the ends of the strips I327. The strip Him is considerably narrower than the strips I31) and is cemented to the top strip I312 so as to support the type bars l2 adjacent the collide cars In. The end lugs I lb are bent over at their ends to overlie the ends of the strip l3a so as to prevent the assembly of strips from springing out of the lugs bar rest and 2 lla. The assembly comprising the strip ll and the'strips I311, I3!) is supported on the pins Ill by means of the spring members l4, each of which is formed with a pair of bent-over lugs'l la loosely pivoting the members H! on the pins ill, the members Ma being retained on the pins by means of the retaining plates l5 which are sprung into grooves formed in the pins 10 in a well-known Way. The members l4 are attached to'the strip II at points approximately the length of the strip ll from the ends of the latter, in order to obtain as even a distribution of weight as possible. The assembly supported by the members I4 is also provided with the compensating weights l6 which are secured in any suitable manner to the ends of the strip ll adjacent the lugs llb.

It has been found by experiment that it is desirable that the rebound pad and rest have a more or less definite weight distribution related to thepositions of the type bars in order to function with maximum efficiency as a rebound suppressing means and it is for this reason that the additional strips l3b are provided, their function being primarily for the purpose of adding weight to the rebound pad although they also assist to a certain extent in cushioning and silencing the rebound. It has also been found that the weights l6 improve the suppression of the rebound of the end type bars which is somewhat different from the rebound of the type bars at the center of the basket arising partly from the fact that the end type bars are somewhat sharply bent adjacent their ends and partly because of the angularity with which the end type bars are disposed in relation to a vertical plane passing through the center of the type basket and the printing point. When the end type bars strike, they move at such an angle that the effect of gravity as a restoring force is considerably less than on the center type bars and their heads must be substantially in a vertical plane passing through the printing point and at right angles to the usual platen whereas the type bars nearer the center are bent only at very small angles.

While there have been shown and. described and pointed out the fundamental novel features of the invention, as applied to a preferred embod ment, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention. therefore, to be lim- 7 ited only as indicated by the scope of the following claims.

strip attached to said supporting strip intermediate the ends and the center of said supporting strip.

bars comprising a curved supporting, member,

means to yieldingly mount said member; toenable translating movement thereof in the-ldireetigns of the planes of rebound of said typebars a curved rebound cushion disposed along said member and supporting said array of type bars,. andweighting means disposed at the ends of said member .to compensa te for, the different rebound h r teri i e v t ndr y e h zo i s arra as .oomparedwith thetypebars at the center of said, array.

3. Atype bar rest comprising a,curvi1inear.. sup-. portin me r havin pa for up o n ra curvilinear array of type barsand adapted to add non-rigid weight to said member ,and,..a1so. actias u h o u i a type ars nd. inclu in wei ht mg b r te o he-ends ofisai supnortin emem 2. A type bar rest for a curved array of type 4 and a floating mounting for said supporting member.

4. A type bar rest comprising a resilient rebound pad for supporting a curvilinear array of type bars, a curved supporting member for said pad and formed of relatively thin metal, said pad ,being relativel considerably thicker. dimensionally than said member so as to add; non-rigid weight to said member, springs for supporting said member, and weights mounted on said member at its ends to increase the weight distribution at the; ends.

5. The invention set forth in claim 3 in which the, pad comprises a series of separate resilient strips.

REFERENCES CITED ,The following references .are of record, iii-the filewof this patent:

UNITED STATES I PATENTS Number Name Date 1,011,970 Koerner Dec. 19, 191 1 2,224,083 Myers Dec. 3', 1949