US730456A - Silent-key mechanism for type-writers. - Google Patents

Description

V PATENTED JUNE 9. 1903. W. F. HBLMOND & 0. 0. KAVLE. SILENT KEY MECHANISM FOR TYPE WRITERS.

" APPLIGATION FILED NOV. 13, 190? INVENTORS #4; ATTORNEYS NO MODEL.

YHE NORRIi F5755 CO, PHOTDLIYHQ, WASHMGTON. D. C4

WILLIAM F. HELMOND AND OSCAR C. KAVLE, OF HARTFORD, OONNEOTI- Patented June 9,1903.

PATENT OFFICE.

OUT, ASSIGNORS, BY MESNE ASSIGNMENTS, TO UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

SILENT-KEY MECHANISM FOR TYPE-WRITERS.

SPECIFICATION forming part of Letters Pate-ntNo. 730,456, dated June 9, 1903. Application filed November 13 1902. Serial No. 181,150. (No model.)

To all whom, it may concern.- Be it known that we, WILLIAM F. HELMOND and OSCAR O. KAVLE, citizens of the United States, and residents of Hartford, county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in Silent-Key Mechanism for Type-Vriters, of which the following is a specification.

Our invention relates to silent keys of type- [0 writers and like machinesthat is, to keys which print without feeding the carriageas, for instance, keys for applying accent-marks and the like.

Our present invention has especial reference to machines in which the impression is efiected through the medium, ofcan ink-ribbon,which is movably mounted and is brought to the printin -point by the operation of any one of the type-keys. In many machines provision is made for lifting the carriage or a portion of it in order that the platen may come into operative relation with one or the other of two types carried by the type-levers. The object of this'invention is to provide 2 5 a simplesilent-key mechanism for machines of this class by which the requisite movement will be imparted to the ribbon by the movement of the silent key whether the platen be in the upper-case or in the lower-case position.

The invention will be fully described hereinafter and the features of novelty pointed out in the appended claims.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a sectional elevation of a portion of a type-writing machine embodying our invention. Fig. 2 is a rear view of a portion of the mechanism, and Fig. 3 is a detail side view of the ribbon-guide and the parts connected therewith directly. 1

We desire it to be understood that the construction illustrated is only an example and that various modifications'may be made without departing from the nature of our invention.

As illustrated, the key 1 is secured to a keylever 2, fnlcrumed at 3 upon the frame 4 and having a loose connection at 2 with a link or elbow lever5, fulcrumed at 6. This link is also loosely connected at 5 with atypelever 7, fulcrumed at 8 on the segment .9 and carrying double type 10. Normally the typelever rests on a cushion 11.

Rigidly secured to the key-lever 2 adjacent to its pivot end is an arm 12, the upper end of which has a fork 13 arranged to straddle an operating-crank l l filvhich is rigidly secured upon a rock-shaft 15. This rock-shaft is mounted in the frame 16, which is pivoted at 17 and supports the front rail 18, forming a track for the carriage, this being a wellknown construction. Any suitable shift mechanism is employed for swinging the frame 16, and with it the platen portion of the carriage, up or down. The length of the crank 14 is such that whether the frame 16 be up or down such crank will remain in operative relation to the fork 13, which simply slides along the crank as the latter is raised or lowered with the frame 16. The crank 14: is adj ustably secured upon the shaft 15, as by means of a set-screw 14, which not only permits the crank to be turned upon the shaft, but to be adjusted lengthwise thereof to bring the crank into registry with the arm 12, according to thelocation of the silent key, which may vary. Of course if the machine comprises several silent ,keys, a corre sponding number of-cranks fi vill be secured upon the shaft 15. The rock-shaft is supported by arms 19, which are secured adjustably to the rail. 18, as by means of a set-screw 20 engaging a slotted portion 19. Upon the rock-shaftis also rigidly secured, as by means of a setscrew 21 a crank-arm 21, having a lateral extension 21". This extension is adapted for engagement with an arm 22, secured rigidly to-the curved carrier 23, the free end of which is formed into a hook 24,connected withthe ribbon-guide 2i". This carrier is pivotally connected at 25 with the stationary arm 19 and is drawn toward the extension 21 by a spring 26. Upon the pivot 25 is also loosely mounted an arm 27, carrying a collar 28, loosely at its free end. A spring 29 connects the carrier 23 with the arm 27 5 sition.

and has a tendency to bring these parts into the position shown in Fig. 3, the lower end of the arm 27 being adapted to abut against an inclined shoulder of the carrier 23 and to fit 5 between the said carrier and the arm 22, as

shown in Fig. 2.

The collar 28 engages a vertical guideway in a bracket 30, which is projected from a frame or bar 30, which moves from front to lo rear on the frame of the machine, being connected ,with the universal bar 31, which receives a movement from front to rear in the usual mannerthat is, all keys that are not silent keys are provided with projections or heels 7, as indicated in dotted lines in Fig.

1, these heels being adapted to engage the universal bar and to move it rear ward. The frame 30 is connected with the escapement mechanism in the well-known or in any approved manner, so that each rearward movement of the universal bar causes the carriage to be fed. At the same time, through the medium of the bracket 30 and of the arm 27, the carrier 23 is swung on its pivot 25, so as to impart the usual upward movement to the ,WW ribbon-guide 24.

Should the frame 16 and the track 18 be raised from the position shown in Fig. 1, the engagement of the bracket with the collar 28 will remain substantially 0 the same, owing to the vertical guidewayprofore not operated. The arm 12, however, by

means of its fork 13 imparts a rocking movement to the crank-arm 14 in the direction indicated by the arrow, and this movement is by means of the shaft 15 communicated to 5 the arm 21, the extension of which, 21 then abuts against the arm 22 and swings the carrier 23 upward on its fulcrum 25, thus also raising the ribbon-guide 24. The arm 27 of course remains stationary during this movement, and the spring 29 allows the carrier 23 to move independently of the arm 27 in this particular case, but restores the parts to their original position as soon as the silent key is released. It will be readily seen that the operation of the silent key upon the ribbonguide is substantially the same, whether the rail 18, and with it the platen, be in the upper or the lower position. The leverage of the arm 12 upon the crank-arm 14 is slightly 6o changed by shifting the arm 16 up or down,

but not sufficiently to materially afiect the operation.

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

1. In a type-writing machine, the combination with a ribbon-guide and a movable carrier therefor, of a rock-shaft having means for imparting movement to said carrier, a crank-arm upon said rock-shaft, a movable frame, adapted to support the carriage and also supporting the said carrier and rockshaft, and a key fulcrumed on the main frame of the machine and provided with an operat- .1ng-arm having a sliding engagement with the said crank-arm so that the said crankarm may be raised or lowered together with the movable carrying-frame, without bringing said crank-arm out of operative engagement with the arm on the key.

2. In a type-writing machine, the combination with the main frame and the key fulcruined thereon, said key being provided with an operating-arm, of a carriage-supporting frame movably mounted upon the main frame, a carrier movably mounted on said carriagesupporting frame, a ribbon-guide connected with the carrier, and an operating element connected with said carrier and having a sliding engagement with the operating-arm of the key so as to remain in operative relation to the key, Whether the carriage -supporting frame be in the raised or the lowered position.

3. In a type-writing machine, the combination with the main frame, a key fulcrumed thereon and provided with an operating-arm, a carriage-supporting frame movably mounted on the main frame, a carrier pivoted on said carriage-supporting frame, a ribbon guide connected with said carrier, a rockshaft mounted on the carriage-supporting frame at a distance from the pivot of the carrier and provided with a member arranged to operate said carrier, and another member mounted on said rock-shaft and arranged to engage the operating-arm of the key, whether the carriage-supporting frame be in its upper or in its lower position.

4;. In a type-writing machine, the combination with a main frame, an auxiliary frame movably mounted thereon and adapted to support the carriage, a carrier fulcrumed on said auxiliary frame, a ribbon-guide connected with the carrier, a rock-shaft journaled in the auxiliary frame and extending parallel with the pivot of the carrier, said rock-shaft having a member adapted for operative engagement with the carrier, a crank-arm ad- 3 ustable lengthwise upon said rock-shaft, and a key fulcrumed upon the main frame and provided with an arm arranged to engage said crank-arm irrespective of the position of the auxiliary frame.

5. In a type-writing machine, the combination with the main frame, an auxiliary frame adapted to support the carriage, a universal bar adapted to be operated by sundry of the keys, and an escapement-operating member connected with said universal bar, of a carrier fulcrumed upon said auxiliary frame, a ribbon-guide connected with the carrier, an arm having a yielding connect-ion with the carrier and engaging the member which operates the escapement so that the carrier will be operated by a movement of said escapemanta-operating member, while also allowing for a movement of the carrier independently of said member, and keyoperated means for actuating the said carrierindependently of the escapement-operating member.

6. The combination in a type-writing machine of a main frame, a movable auxiliary frame adapted to support the carriage, a universal oar adapted to be actuated by sun- 'dry of the keys, an escapement-cperating member connected with said universal bar, a bracket which is rigid with said member and which is provided with a vertical guide way, an arm fulernmed on the auxiliary frame havinga sliding engagement with said guideWay a carrier fulcrumed on said auxiliary frame at the same point as the said arm, a spring which has a tendency to throw the carrier away from said arm, a ribbon- \VILLIAM F. HELMOND.

OSCAR O. KAVLE. Witnesses:

EDWARD J. MANNING, E. A. EDGAR.

Images