US1389120A - Typewriter - Google Patents

Description

J. W. BUCHANAN.

TYPEWRITER.

APPLICATION FILED JULY16,1919.

1,389, 1 20. P tente Aug. 30, 1921.

SHEETSSHEET l. 2

1. w. BUCHANAN.

TYPEWRITER.

I APPLICATION FILED JULY 16. 1919.

1 L m m m a m k m m mm m d 2 UNITED, STATES PATENT OFFICE.

JOHN W. BUCHANAN, OF BOSTON, MASSACHUSETTS, ASSIG-NOR OF ONE-HALF TO GEORGE E. SANFORD, OF BOSTON, MASSACHUSETTS.

. TYPEWRITER.

' Application filed July 16,

To all whom it may concern! Be it known that L'Jorrrr W. BUCHANAN, a citizen of the United States, residin at Boston, in the county of Suffolk and tate of Massachusetts, have invented certainnevv and useful Improvements in Typewriters, of which the following is a specification.

The invention has for an object to provide a typewriter adapted to be taken down or foldedand carried in the pocket. It is also an aim to give an improved type bar mechanism suitable for usein a typewriter wherein a traveling basket of type is employed. A further aim is to elfect improvements in the manner of assembling and connecting the parts in a typewriter of this character.

Additional Objects, advantages and features of invention will appear from the construction, arrangement and combination of parts hereinafter set forth and shown in the drawings, wherein,

Figure 1 is a top plan view of one embodiment of my invention,

Fig. 2 is a cross section on of Fig. 1,

Fig. 3 is a longitudinal sectional view on the line 33 of Fig. 1,

Fig. 4C is a fragmentary horizontal sectional view on the line 4.-4= of Fig. 2,

Fig. 5 is a fragmentary sectional view on the line 5-5 of Fig. 3,

Fig. 6 is a detail elevation of one of the type bar units,

Fig. 7 is a similar view of the unit in retracted position,

Fig. 8 is a detail of the paperv feed,

Fig. 9 is a detail of the spacer and carriage feeding device.

There is illustrated a typewriter comprising two U-shaped head blocks 10 having flat bases intended to form the ends of the frame on the typewriter, each of these blocks hav ing at opposite upstanding ends near the top suitable mortises 11, of peculiar shape, into which the ends 12 of rails 13 ma be engaged, to interlock with the blocks, the formation of the mortises being such that the rails may be pressed thereinto from the direction of the ends of the blocks. The rails 13 are formed in three sections, the middle section being dove-tailed into the end sections, the mortise running in horizontal direction and pins 14 may be employed to sethe line 2-2 Specification of Letters Patent. Patented Aug. 30,1921.

1919. Serial No. 311,282.

cure the joints further. The rails 13 are ordinarily of such a length when assembled that they will hold the blocks apart a distance sufficient to receive a letter sized sheetflaid cross-Wise of the rails 13. A platen plate 15 is provided, set in suitable sockets intermediately between the rails 13, and at a lower level. Each of the blocks is also provided with a suitable centrally located bracket 16, in which a ribbon roller 17 i 'is mounted, a ribbon 18 being provided,

wound from one to the other in any suit-' able manner. Mounted between the blocks 10 beneath one of the rails 13, there is, a

large paper feed roller 19, over which there is a second feed roller 20 in contact with the first, while above the small roller there is mounted a shaft 21 also revoluble in the head blocks 10, and having a worm 22 thereon adjacent one end of a sufiicient extent for the purpose to be described. The last named shaft and rollers are preferably in section, joined at the places indicated by vertical lines thereon in Fig. 3. Upon the shaft 21 and the shaft of the roller 20 there are secured gears 23 and 24: respectively, the gear 23 having in the present instance but one tooth, as illustrated, and the teeth on the gear 24 being so spaced that the teeth thereof will be engaged successively by the tooth of the gear 23as it rotates. vUpon the shaft of the large roller 19 there is a large gear 25, loosely revoluble and carrying a spring pressed pawl 26 engaging a ratchet 27 fixed upon the shaft of the roller 19 in any suitable manner. 'The, pawl and ratchet device is intended to operate to move the feed roll only upon return movement of the traveling member hereinafter described. Longitudinallyreciprocable upon the'rails 13, there is serving as a striker, at its outer end being suitablyshaped to engage .respective operatrod 40, headed at its upper end for engagement by the forefinger of an operator, or by the palm, as required, a slot being formedin the side of the stem 33 within the casing 30, and having a flange 41 secured to the stem 40 therethrough, the flange being of annular form and encircling the lower part of the stem Mounted upon the under side of the top of the casing, there is a bell crank 42 having one arm resting upon the flange 41 the other extending downwardly and being connected by a link to a bell'crank 44 mounted for oscillation in a horizontal plane, one arm being projected outwardly into close proximity with the rail 13 at one side, the parts being located so that this outwardly projecting arm will move rearwardly when the rod 40 is depressed, having regard to the direction in which it is desired that the traveling member shall move during the typewriting of a line. The outer end of the arm 44 is provided with a suitable dog 45 to engage the rack face 46 formed upon the adjacent rail 13,a spring 47 being engaged with the crank 44 to return it to initial position when the rod 40 is relieved of pressure. If desired, the cranks 4244, the link, dog and spring may be .duplicated at the opposite of the traveling member, and a rack face formed upon the inner side of each rail 13, so that a forward impulse will be exerted upon the traveling member at each side. The upper end of the rod 40 is projected a sufficient distance above the knob 32 to permit independent operation of the rod and propelling devices without movement of the knob 32, so that spacing between words may be attained.

The top of the casing30 is provided with a concentric series of guide lugs 50 arranged to receive the outer end of the striker arm 34 therebetween, to engage the upper ends of operating rods 51, which are extended slidably upward through the top of the basket 31 for a short distance, but stopping short of the upper side of the blocks 50. Each rod 51 is connected with a respective type bar mechanism constructed as follows:

A mounting plate 52 is provided for the type bar mechanism, including a base flange 53 riveted or otherwise secured to the cylindrical wall of the basket 31, the body of the plate extending at right angles to the flange or ina plane parallel to a diametrical plane of the basket. The mounting plate includes two fulcrum arms 54 and 55, one closely adjacent-the top of the basket, while the other lies on a level closely adjacent the bottom of the basket. Upon the arm 54 there is pivoted a guide bar 56, stamped from sheet metal and of rectilinear form from closely adjacent its pivot to its outer" part. Upon this bar there is slidable a sleeve element 57 of a type bar 58, snugly fitted upon the bar 56 for sliding movement, and having a lateral ear 59 connected to a bell crank or link 60, pivoted upon the lower arm 55 of the plate 52, the outer end of the crank moving in Fig. 7 where the outer end of the crank 60 falls just below the base pivot of the bar 56, and slightly outward thereof with respect to the center of the type basket. The ear'59 upon the type bar is of such length as to permit the latter to lie closely against the crank 60 when the parts are retracted, the type 62 upon the outer end of the bar being thenheld closely adjacent the base pivot of the crank 60. The lower end of the operating rod '51 is connected to the crank 60 in the direction of the center of the basket from the base pivot of the crank and slightly thereabove, when the parts are in retracted position, as shown in Fig. 7. The rod is also curved at its lower end so that the parts connected to the link 60 may swing outwardly a distance beneath the arm 55 when the rod 51 is forced to the lower limit of its movement, without interference in the operation of the crank 60. In other words, the body of the rod 51 ,is offset toward the center of the basket from its point of connection with the link 60. With the parts in initial position as shown in Fig. 7, downward pressure upon the upper end of the operating rod 51 will cause the link to bear upon the type bar sleeve swinging the bar rapidly inward upon the pivot of the guide bar while the sleeve 57 moves outwardly upon the bar, the initial movement of the extremity of the bar being inwardly and upwardly while its final movement is abruptly downward until its strikes 'upon the platen bar 15, or material supertype basket.

While I have illustrated the knob and other parts between the knob and the type bar mechanism as the best means which I have thus far designed for operating the type bar mechanism, it will be understood that various other means may be employed as found desirable for operating the type bar mechanism, and various carriage moving mechanisms may also be employed for eflecting movement of the traveling member upon the supporting rails.

The worm on the shaft 21 is engagedby a stud arm 22, mounted on the side of the casing 30 and projecting into close relation with the shaft, as shown in Fig. 2. This causes rotation of the shaft to correspond. to the number of convolutions of the worm upon the shaft, thereby rotating the gears 24 and 25. Rotation of these gears in one direction causes the paper feed rolls 19 and 20 to be rotated through the agency of the pawl 26, while reverse movement is idle, owing to the non-engagement of the pawl.

The casing 80 has a stud 22' projected therefrom radially into close proximity with the shaft 21, whereby upon reciprocation of the traveling element the shaft 21 will be correspondingly rotated, actuating the ratchet device 26, by which the rollers .19 and 20 are rotated to feed the paper, indicated at A in Fig. 2.

What is claimed:

1. A typewriter comprising an elongated platen bar, parallel guide rails, a traveling type basket carried thereby, a plurality of type printing units mounted in the basket each including an upwardly disposed operating member adapted to be depressed to operate its respective type printing element,

said type printing elements being each adapted to print a character centrally beneath the basket with a downward stroke, an operating knob centrally mounted with respect to the type printing element and revoluble in the baskethaving an arm movable to selectively engage alternatively the operating members of the type printing units, and being vertically reciprocable for operation; and means associated therewith to move the basket longitudinally upon each vertical reciprocation of the operating knob.

2. In a typewriter, a circularly arranged series of type mechanisms each including upwardly projected operating stems and resilient means to hold the stems at the upper limit of their movement, a central revoluble and vertically reciprocable striker, resilient means to hold the striker at the upper limit of its movement, said striker including ah arm movable into registry selectively with the operating rods of the type mechanism, for the purposes described.

3. In a typewriter including a frame and traveling member, a type and spacer mechanism including a vertically reciprocable spacer key having a large knob and a type operating mechanism including a reciprocable member concentrically located in said knob and exposed outwardly of the one first mentioned.

In testimony whereof I have afiixed my signature in presence of two Witnesses.

JOHN W. BUCHANAN.

Witnesses:

JOHN G. PREvos'r, A os P. S'rown.

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