US1418077A - Typewriting machine - Google Patents

Description

'1. B. HOLDEN. TYPEWRITING MACHINE. APPLICATION FILED N15, 192I.

Patented May 30, 1922.

2 SNEETSSHEET I.

- lhz/ezziorz- J. B. HOLDEN, TYPEWRITING MACHINE.

APPLICATION FILED JAN. 5. 192i.

Patented May 30, 1922.,

JO$EPH 1B. HOLDEN,-F SYRACUSE, NEVT YORK, ASSIGNOIR- T0 REMINGTON TYPE- WRITER COMPANY, 013 ILION, NEV, YORK, A CORPORATION OF NEW YORK.

TYPEWRITING MACHINE.

Original application filed March 2, 1920, Serial No. 362,675. Divided and Serial No. 435,221.

Y new and useful Improvements in Typewriting Machines, of which the following is a specification.

My invention relates to typewriting machines and it has for its principal object to provide various improvements in the ribbon feed and reverse mechanism. of such machines.

I have shown my invention embodied in portable typewriter and some of its features are especially designed for use in machines of that class but other of said features are adapted or can readily be adapted to the larger standard typewriters, and other machines that print with an ink ribbon.

To the above and other ends my invention consists in certain features of construction and combinations and arrangements of parts all of which will be fully set forth herein and particularly pointed out in the claims.

This application for patent, is a division of my prior application for typewriting machines, filed March 2, 1920, Serial No. 362,675, now Patent No. 1,391,166, dated November 15, 1921.

One embodiment of my invention is illustrated in the accompanying drawings, in which- Figure 1 is a skeletonized front to rear vertical sectional view of a. portable'typewriter having my invention embodied there in, only so much of the machine being shown as is necessary to a full understanding of the invention.

Figure 2 is a view on an enlarged scale of certain parts of the ribbonfeed mechanism, the same being shown in section through the main feed shaft. 1 I

Figure 3 is an enlarged perspective view of the parts shown in Fig. 2.

Figure 1 is a front elevation of the rear part of the machine including my improvements, section on the line y-y of Fig. 1. I Figure 5 is a fragmentary top plan view showing a portion of the ribbon feed mechanism and associated parts. I

Figure 6 is an enlarged view in vertical section through the right-handribbon spool and its supporting and driving devices.

Specification of Letters Patent.

parts of the machine being shown in- Patentedlliay 30,1922.

this application filed. January The typewriting machine partially shown in the drawings is similar to and as far as my invention is concerned may be identical with the one shown and described in the patent to Arthur TV. Smith, No. 1,342,513, dated June 8, 1920, but as far as most of the features are concerned the details of construction of the machine can be varied and in fact some of thefeatures of my invention are applicable to ink ribbon mechanisms generally.

The main frame of the machine shown in the drawings comprises sheet metal side plates 1 rigidly connected together by several frame members. One of these consists of a frontcomb plate 2 also of sheet metal and having a series of slots out both along its upper edge and along its lower edge. Near to the back of the machine said side plates are connected by a casting comprising amongst other things a type bar segment 6. The machine is more or less enclosed in a casing 8 including a top plate 10 and a base 11, the frame plates 1 being secured to said base by screws 12 and said top plate being secured to'the side plates 1 by screws 13, Fig. 4;. i

The type action of this machine includes top strike type bars 14, Fig. 1, pivoted on a wire 15 supported by the segment 6, which segment is radially slotted to accommodate said type bars. Each of the type bars 14L has on the heel thereof gear teeth meshing with suitable gear teeth on a. sublever 16, all of said sublevers working in radial slots of a segment to which they are pivoted on a curved wire 17. Each of the sublevers 16 is connected at its forward end by a link 20 with another sublever 21. The sublevers 21 are mostly levers of the third order, each mounted in one of the slots in the upper edge ofthe comb plate Each of the sublevers 21 is connected by a depending link 28 with a keylever 2 1 having a printing key 25 on its forward end. The key levers 2 1 are pivoted at their rearends in a stationary comb plate 26'having a wire 27 supported thereby to retain the key levers in place.

The machine has a collapsing feature according to which the type bars 14 can be dropped down from the upstanding position shown in Fig. 1 to a substantially horizontal position as fully set forth in the patent to Arthur W. Smith above referred to; but the collapsing mechanism is not shown herein.

The platen 31 is situated in rear of the type bar segment 6 and the type bars are adapted to'strike down upon the top of said platen. Each of said type bars carries two types and the platen 31 is made shiftable to print from either type. This platen is mounted on a suitable carriage, which is not shown but which runs on certain rails, which rails are mounted on brackets 35 constituting part of a case shift frame capable of being shifted toward the rear of the machine from the position shown in order to print the upper .case characters.

The case shift frame includes side bars '36, one mounted just inside each of the side plates 1. These plates or bars 36 are mounted at their forward and rear ends so as. to'be shiftable back and forth. The mounting and many of the connections of thi frame are not shown in the drawing, as they form no part of the present inven tion. The shift frame is mentioned here because, in the machine to which I have shown my invention applied, the entire ribbon feed mechanism is mounted on'it, in-

cluding the universal bar of the machine.

The bars 36 extend rearward nearlyto the back of the machine and at their rearv ends each of them has a downward extension from which a horizontal bracket 41 is bent inward as shown in Fig. 4. As best shown in Fig. 4 each of said bars 36 has also an upward extension bent inward to form a bracket or a shelf 42 on which one of the ribbon spools and associated devices are mounted. This shelf is not shown in F 1. The two side bars 36 of the shift frame are connected together at their rear ends by a sheet metal cross bar 43, Figs. 4: and 5, which at its ends lies on the brackets 41 to which it is secured by screws 44:. I The brackets 35 to which the carriage rails 34 are directly secured, consist of. right and left hand rearward extensions of this bar 43. 45

A universal bar 52 underlying all of the key levers 24, is carried at its ends by levers 53 each pivoted at 54 to one of the bars 36 of the shift frame, so that this universal bar partakes of the shifting motion of said frame. In the vicinity of the pivot 54 the two arms 53 are connected by a cross bar which ofcourse partakes of the oscillating motion of the universal bar when the latter is operated by the key levers. In the pres r ent instance the ribbon mechanism is operated from'this cross bar-55 as will hereinafter appear. The universal bar is provided with any suitable restoring springs ll).

A shaft 56, Figs. 1, 4 and 5, is located just in front of the platen 31 and said shaft is mounted on pivot screws 57 supported by brackets 58 bent up from thesame piece of metal as the crossbar 4:3 of-the shift frame. This shaft at its middle carries the escapement feed dogs for controlling the feed of the carriage but to avoid confusion in the drawings neither said feed dogs nor the rack with which they co-operate is shown herein. The construction thus far described is or may be substantially the same as that disclosed in the patent to Arthur W. Smith, hereinbefore referred to.

The ribbon-spools 61 are alike and are of ordinary construction except that the lower flange of each has any suitable num ber of lugs 62 struck down therefrom out of the metal of the flange for co-operation with the driving mechanism, as will hereinafter appear. The two flanges are connected by a drum 63 on which the ribbon 64 is wound. Each spool is mounted on a vertical post 65 having a flange 66 on which the spool rests,.said flange as here shown being enlarged into a nut 67. The post is interiorly threaded and is screwed down onto the screw threaded end 68 of another post 70, Fig. 6, which post is mounted on one of the brackets 4-2 of the shift frame to which it is riveted at 71. part 68 the post 70 has a bearing part 72 on which is journaled a beveled gear wheel 7 having a pin 74 projecting upward there from to such an extent as to co-operatewith. the lugs 62 of the ribbon spool, so thatif the wheel 73 be turned the spool will turn with it. The nut part 67 ofthe post 65 serve as a retaining nut for the wheel 73. The spools 61 can be readily removed from the machine by merely lifting them off from their posts 65. The spools are prevented from coming off accidentally by a releasable retaining device 76 which is not claimed herein but is claimed in a companion application for patent.

The ribbon feed mechanism includes a drive shaft having thereon two bevel pinions 86 for driving the bevel gears 73 alternatively. The shaft 85 is journaled in the posts 70 as shown in Fig. 6, and it can be shifted endwise to move one of the pinions 86 out of engagement with its gear 73 and the other pinion 86 into engagement with its gear, to reverse the direction of ribbon feed. In the present instance this reverse is effected manually, no automatic reversing means being shown, though it is obvious that such automatic means can be provided if desired. The shaft 85 projects I slightly beyond the casing 8 at both ends where it is equipped with milled heads 87 by a manipulation of which the shaftcan be shifted to reverse the'feed and also the shaft can be turned in order to wind the ribbon manually-onto one of the spools.

I have shown an exceedingly simple detent device to retain the shaft in either of its two positions. As shown in Figs. 4 and 5 said shaft has two grooves 88 turned therein and said grooves are connected by a rounded bulging part of theshaft. A wire-loop 90 is Below the screw threaded secured at its ends to one of the brackets 12 by being inserted through holes in said bracket and bent into close contact with the upper and lower surfaces of the bracket as shown in Fig. 4c, and the end of said loop is pressed upward by the resilience of the wire into one of the grooves 88. The shaft cannot slide endwise without springing this wire downward over the bulge in the shaft, but the shaft can be pushed endwise by the application of a little force. The extreme simplicity, cheapness and lightness of this retaining device are advantageous and especially so in .aportable typewriter.

The shaft 85 is driven step by step by the oscillations of the universal bar 52. A ratchet wheel 91 is secured upon the reduced end of a hub 92 which hub is mounted on the shaft 85 to which it is rigidly connected as by a pin 93. The hub device 92 has a flange 9 1 and on a step of said hub between said flange and the wheel 91 there is journaled an oscillatory device 95, which hangs down at an inclination toward the front of the machine and has a slot 96 therein. A sheet metal pawl 97 is pivoted to the device 95 on a screw 98 and is pressed by a spring 100 into engagement with the teeth of the ratchet wheel 91. This pawl as here shown comprises two ears 101 which are journaled on the pivot screw 98 and a third ear 102 to which the spring 100 is connected at one end, the other end of said spring being connected to a pin 103. The construction is such that if the device 95 be oscillated back and forth the pawl 97 will. intermittently turn the ratchet wheel 91 in the direction of the arrows in Figs. 1 and 3, that is to say, toward the rear of the machine at its top. This pawl and ratchet combination is thus permanently mounted on the shaft 85 not far from the middle of the machine. By mounting the operating device 95 on the shaft itself the pawl 97 is caused to engage the ratchet wheel 91 correctly even though the shaft may spring a little. It will be perceived that this pawl and ratchet combination is shifted to the right and left a short distance when the shaft 85 is shifted to reverse the feed.

The actuating device 95 is operated by a pin 10% projecting transversely from an arm 105 which arm as shown in Figs. 1 and 5 is secured by two screws 106 to the cross bar 55 of the universal bar frame. The pin 104 is made long enough so that it remains in the slot 96 in both positions of the shaft 85. In the present instance the arm 105 is bent at a right angle at 107 to bring the sheet metal of which the arm is made into two planes, the upper part of the arm being in a vertical plane and the lower part in a transverse plane so that it can lie flat on the bar 55. Backward rotation of the ratchet wheel 91 may be prevented by any suitable retaining pawl. In the present instance a pawl 108 made of sheet metal has ears 110 bent back therefrom and pivoted on the escapement shaft 56 where it is retained in place lengthwise of said shaft by means of a collar 111, Fig. 5, situated between the two ears 110 and secured to the shaft by a set screw 112. It will be noted that the engaging end of the pawl 108 is made wide enough to allow for the longitudinal shifting of the ratchet wheel 91 with the shaft 85.

I have shown a pressure plate 114, Figs- 4- and 5, adjacent to each ribbon spool and spring pressed against the ribbon. This plate can be variously constructed and mounted. As here shown it is pivoted on a pivot screw 115 screwed into the upper end of a post which rises from a bracket 117 secured as by screws to the bracket 42 of the shift frame. A spring 120 coiled about the post presses the plate 114i against the ribbon. This pressure plate is herein employed for the same purpose as similar devices in other machines.

-A ribbon vibrator 121 guides the ribbon in its course from one spool to the other.

Said vibrator and the mechanism by which it is operated, are not fully shown nor described herein, but are described and claimed in my prior application, Serial No. 362,67 5, of which the present case is a division.

Various changes can be made in the details of construction and arrangement without departing from my invention.

What I claim as new and desire to secure by Letters Patent, is

1. The combination of a block 70 having a reduced bearing 72 and a still further reduced threaded part 68, a gear 73 journaled on said bearing, a post 65, 67 screwed onto said part 68 and having mounted thereon a ribbon spool which is operatively connected with said gear 73, and a drive shaft 85 journaled in said block 70 and having a pinion 86 adapted to drive said gear 73.

2. The combination with two ribbon spools and a drive shaft shiftable endwise to connect it with one spool or the other, of shaft retaining means consisting of a spring wire loop having one section thereof lying crosswise of said shaft and pressed against said shaft by the resilience of the wire, and two peripheral grooves in said shaft engaged one at a time by said loop, for retaining said shaft in either shifted position.

Signed at Syracuse, in the county of Onondaga, and State of New York, this 23 day of December, A. D. 1920.

JOSEPH B. HOLDEN.

Witnesses:

CHRISTINE W. MASON, N. L. STAFFORD.

Images