US2870897A - Electrically operated text writing device for bookkeeping machines - Google Patents

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Jan. 27, 1959 Filed Sept. 20, 1955 F. HUBL ELECTRICALLY OPERATED TEXT WRITING DEVICE FOR BOOKKEEPING MACHINES 2 Sheets-Sheet 1 F.HwbL

Jan. 27, 1959 F. HUBL 2,870,897

ELECTRICALLY OPERATED TEXT WRITING DEVICE FOR BOOKKEEPING MACHINES Filed Sept. 20, 1955 2 Sheets-Sheet 2 INVENTOP ELECTRICALLY OPERATED TEXT WRITING DEVICE FOR BOOKKEEPING MACHINES Fra z Hiibl, Goteborg, Sweden, assignonto Keinzle Apparate .G. in. b. H., Villingen, Schwarzwalrl, Germany The invention relates to an electrically operated text writing device for bookkeeping machines.

Electrical typewriters are known, wherein the type striking operation is effected by the motor, the known pivotable type bars supported in segments being moved by rotary cams associated with each key and eachtype bar respectively. Such devices result in appliances too intricate for motorized manual typewriters.

In order to obtain a simple and inexpensive construction with reliable effect, a rotary motor driven type wheel is provided which is stopped, in the respective positionscorresponding to the selected keys by means .of stops operated by pressure on the respective keys, and is caused to strike. In an advantageous embodiment, cams are mounted on a shaft. The shaft is driven by a slip clutch. through a gear wheel actuating the typewheel and posi-- tioned on a pivoted lever carrying the type wheel. The cams are actuated by key operated stops in such manner that they stop the type wheel in a respective position, wherein the type corresponding to the pressed key is in. printing position. The gear wheel journaled on the: pivoted lever and the gear wheel mounted on the cam shaft are positioned so that their pitch circles extend in,

a short distance from the pivotal axis of the pivoted lever,

The direction of rotation of the gear wheel on the pivoted lever is such that after stopping the cam shaft the pivoted. lever is swung instriking direction by the gear wheel. on the pivoted lever rolling on the gear wheel on the cam shaft. To insure reliable performance of each operation (type print), a locking frame is provided catching the respectively pressed key in operational position- The locking frame is returned from the locking position by the pivoted lever e. g. by means of apin thereon in the striking position of the pivoted lever.

An embodiment of the invention is shown in the drawmg. i

Fig. 1 is an end elevational view of the device according to the instant invention;

Fig. 2 is an elevational view of the device of Fig. 1;

Fig. 3 is a plan view of the device of Fig. 1; and

Fig. 4 is a side view of aportion of Fig. 1 in an operative engaging position.

Referring now to Fig. 1, below a printing spot of a platen 1, the pivoted lever 3 is journaled on an axis 2. A type wheel 4 is journaled on the pivoted lever 3. A shaft 6 with a gear wheel 7 is driven in direction of the arrow by a motor (not shown) through a slip clutch 5. This wheel drives a gear wheel 8, mounted on the type wheel 4, through gear wheels ll, 10, 9. The pivoted lever 3 is drawn into the position as shown by a spring 12. The gear wheel 11 also engages a gear wheel securely mounted on a shaft 14 and to which its rotary movement is transmitted. The position of the gear wheels 11 and 15 is such that the two pitch circles extend in a short distancefrom the axis 2 so that the gear wheels 11 and 15 maintain engagement during swinging movement of the pivoted lever 3. As more clearly United States Patent 1 O 2,870,897 l aient ed Jan. 27, 1959 TCC shown in Figs. 2 and each letter of the type wheel 4 has a corresponding stop 16 securely mounted onthe shaft 14, and each stop 16 hasla corresponding latch 17. t

The latches 17 are pivotally mounted on a shaft 18 and are each connected to a key 20. t

On depressing a key 20, the associated latch 17 is moved into the path of its associated stop, 16. The type wheel is stopped in such manner that the selected letter of the type wheel 4 is in printing position. Theugearl wheel 15.

' is locked, and since the gear wheel 11 continues to rotate,

and that downwardly at its point of engagement with the gear wheel 15, it rocks the pivoted lever 3 in a clockwise direction. By thisrocking movement the letter is printed. The pivoted lever Scarries on its lowerarm 21 a pin 22 which, at the moment of printing, rocks a locking frame 23 t to release the latch 17 which upon depression of the assoposition by the spring actuated ciated key had been held .in locking frame 23. The spring .12 now returns the type wheel into position of rest. Since blocking of the gear wheel 15 is released and the slip clutch 5 pulls through,

all wheels turn again till the. next key is struck. Upon each stroke of a key anindexing device (here not shown) is actuated in a known manner for advancing the carriage. l a

In order to obtain straight line writing, a toothed correcting wheel 24 shown in Fig. 2 is mounted on the type wheel, the wheel being straightened by a centering element 25 positioned just in front of the printing spot.

What I claim as my inventionand desire to secure by Letters Patent of the United States is:

1. In an electrical typewriter, thecombination of a. platen for the paper to be written upon; a type wheel shafts; a gear wheel fixed on said driven shaft; a second gear wheel journaled on said lever and meshing with said first gear wheel; a third gear wheel on said type wheel;

the paper to be written upon;

. plurality of a gear train on said lever, connecting said second and third gear wheels, whereby said type wheel isrotated by said driven shaft; a counter shaft; a fourth gear wheel fixed on said counter shaft; meshing with said second gear wheel, and adapted to rotate said counter shaft; a plurality of stops fixed on said counter shaft and corresponding with the type characters on said type wheel, respectively, said stops being moved in circular paths by rotation of said counter shaft; a plurality of latches adapted to co-act with said stops, respectively; and 21 keys corresponding with the type characters on said type wheel, and adapted to move said latches into the paths of rotation of said stops, respectively, to stop rotation of said counter shaft and said fourth gear wheel mounted thereon, said second and fourth gear wheels being so disposed relative to the pintle of said lever that, when rotation of said fourth gear wheel is stopped, said second gear wheelrolls on said stationary fourth gear wheel and thereby rocks said lever to cause said type wheel to move toward said platen to print the selected character on the paperon said platen.

2. An electrical typewriter, according to claim I, having a locking frame pivotally mounted adjacent said latches, and biased to normal position to lock said latches in operative position, and a pin on said lever adapted to move said frame to unlock said latches.

3. In an electrically operated textwriting device for bookkeeping machines, the combination of a platen for a type wheel bearing type posed that thewheel prints its characters upon the paper when said leveris rockedfrorn its normal position; drivingmeans and: toothed-wheel gearing means, the latter being disposed between said driving means and said type wheelg-and means adapted to interrupt rotation of said typewheel when a'selected character is positioned rela-- tive to said platen for printing said character, said toothedwheel gearing means being adapted to transmit driving movement from saiddriving means to said type Wheel and to-transmit the effect ofsaidinterrupting-means from thelatter to-saidtype Wheel, saiddriving means and said interrupting meansco-operat in'g against the action of said springmeans to rock said lever to print said selected character.

- 4..In an electrically operated textwriting device for bookkeeping machines, the combination of a platen for the paper to be written upon; a type wheel bearing type characters; a lever pivotally mounted on a fixed pintle, biased to normal position, on which said type wheel is journaled, said- Wheel and said platen being so relatively disposed that the wheel prints its characters upon the paper whensaid leveris-rocked: from its normal position; a drive shaft adapted to be electrically driven; a driven shaft; a slip clutch connecting said shafts; a gear wheel fixed. on said driven shaft; a second gear wheel journaled on said lever and meshing with said first gear wheel; a third gear. wheel on-said type wheel; a gear train on said lever, connecting said second and third gear wheels,

whereby said type wheel isrotated by said driven shaft;

a counter shaft; a fourth gear wheel fixed on saidcounter shaft; meshing with said second gear wheel, and adapted to rotate said counter shaft; andsele'ctable interruption means adapted to interrupt rotation ofsaid counter shaft in selected positions.

5'. In an electrically operated textwriting device for bookkeeping machines the combination of a platen for the paper to be written upon; a lever pivotally mounted on a fixed'pintle; spring means retaining said lever in a normal; inoperative position; a type wheel bearing type characters journaled on said lever, said type wheel and said platen being so relatively disposed that the wheel prints its characters upon the paper when said lever is rocked from its normal position; means for interrupting rotation of said type wheel when a selected character is positioned relative to saidplaten for printing of said characteron thepaper; drivingmeans; toothedwheel gearing meansdisposed, between said driving means and said type wheel fortransmitting driving movement to said type wheel-and-fortransmitting the action of said interrupting means to said type wheel, said driving means and said interrupting means being adapted to co-operate againstthe action of saidspring means to rock said lever to print said selected character; and means for insuring thecorrect'position-of said'selected'character relative to said platen during the printing thereof,

6. in an electrically operated textwriting device for bookkeeping machines,the combination of a platen for the paper to be printed upon; ai type wheel bearing type characters; a lever pivotally mounted on a fixed pintle; spring means for retaining said lever in-a normal, inoperative position, said type wheel being journaled on said lever,

and said type wheel andsaid platen being so relatively disposed that said wheel prints its characters upon the paper when said lever is rocked from its normal position; driving means and toothed wheel, gearing means, the

latter being disposed between. said driving..means and. said type Wheel; means for interrupting rotation of said type Wheel when a selectedcharacter is positioned rela-.

tive to said platen for printing thereof, saidtoothed wheel gearing means being adapted to transmit rotational driving movement from said driving means to said type wheel Y and also to transmitthe action of said interrupting means from the latter to said .type Wheel, said driving means and said interrupting means, being adapted to co-operate,

against the action of said spring meansto rock said lever to print said selected character, and meansfor insuring the correct positioning of said selected character relative 'to said platen during the printing thereof.

References Cited in the file of this patent UNITED STATES PATENTS 819,998 Jarvis May 8, 1906 1,520,089 Scherbius Dec. 23, 1924' 2,165,224' Chisholm July 11, 1939 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 2,870,897 January 27, 1959 Franz Hfibl In the grant, lines 1 to 3, for "assignor to Keinzle Apparate G. m. b. H. of Villingen, SchWarzWald, Germany," read as's'ignor to Kienzle ApparateG. m. b. H., of Villingen, SchWarzWald, Germany, line 12, for "Keinzle Apparate G. 111. b. H. its successors read Kienzle' Apparate G. m. b. H. its successors in the heading to the printed specification, lines 4 to 6, for "assgignor to Ke-inzle Apparate G. 111. b. H. Villingen, Schwarzwald, Germany" read assignor to Kienzle Apparate G. 111. b. H. Villingen, Schwarzwald, Germany Signed and sealed this 23rd day of June 1959.

(SEAL) Attest:

KARL H. AXLINE ROBERT C. WATSON Attesting Officer Commissioner of Patents

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