US1473292A - hebern - Google Patents

Description

E. H. HEBERN,

ELECTRIC TYPEWRITING MACHINE Nov. 6 1 923 Filed sept. a, 1919 2 Sheets-Sheet 1 /N VEN 717/? E H. HEBER/V Nov. 6 1923.

E. H. HEBERN ELECTRIC TYPEWRITING MACHINE Filed Sept. 8, 1919 2 Sheets-Sheet 2 ne '06 /NvsA/rD/P .s H. sae-@N er zum n Patented Nov. 6, 1923 unire srrss rarest EDWARD H. HEBEBJN, F OAKLAND, CALIFORNA, ASSIGNOR TO H & H PATENT DE- VELOPING COMPANY, OF OAKLAND, CALFORNIA.

ELECTRIC TYPEWRTNG MACHINE.

Application filed September 8, 1919. Serial No. 322,568.

` ToaZZ-whom t may concern:

Be it known that I, EDWARD 'Hg HEBERN,

a'citizen of the United States,residing at' Oakland, in the county of Alameda; and State of California, have invented Anew and useful Improvements in Electric Typewriting Machines, of which the following is a specification. i

Theobject of the present yinvention is to provide an improved electric typewriting machine, such that asmall depression of the typewriter keys will be sufficient to actuate the type 'for printing, and by which the printing can be effected more easily and `quickly than heretofore, and with absolute uniformity of pressure, notwithstanding variations in the pressure applied to the keys by the operator.

In the accompanying drawing, Figure 1 is a transverse vertical section 'of my imi` proved electric typewriting machine, certain parts not material to the invention being omitted; Figure 2 is a front `view of a detail; Figure 3 is a sectional view of a detail of construction; Figure 4 is a broken view similar'toy Figure 1, but with the parts shown in a different position from that shown in Figure 1; Figure 5 is a sectional view of a disc; Fig. 6 is a view in elevation of the disk shown in Fig. 5; Figure 7 is a broken transverse vertical section showing a modification of the invention; Figure 8 is a similar view, but looking from the opposite side, of parts employed in such modifi cation.

Referring to the drawing, 1 indicates a frame or casting supporting most of the apparatus for converting any ordinary typewriting machine to my improved electric typewriting machine and supporting the ordinary typewriter upon bosses 2, screws passed through said bosses being'screwed into the frame. of said typewriting machine to secure it to said frame 1; 4 indicates the keys ofthe typewriting machine connected to key bars 6 pivoted at l7, and to said key bars 6 are pivota'lly attached, as shown at 8, hangers 9, the lower ends of which carry pins 11 movable in vertically extending slots 12 in the front ends of key levers 13 pivoted at 14. To each hanger is pivoted, as shown Vat 16, the central portion of a dat spring 17 the ends of the pins 8 and 11 respectively on opposite sides of a key bar 6 and lever 13 respectively. The lower endl of said hanger is enlarged or extended forwardly, as shown at 18, to engage and lift up the reduced end of a contact carrier 19 of fiber or other insulating material, pivoted to a bar 21 extending longitudinally of the machine and carrying .a contact 22 pressed down by a spring 23. rlhe slightest pressure on the typewriter key removes the extension 18 from engagement with said contact carrier 19, whereupon the contact carrier 19 and the contact 22 drop and the latter comes into contact with a contact 24 screwed into a longitudinally extending metal frame 26,'attached to casting 1 by a screw 27 (Fig. 3) insulated from said casting by washers 28 and an insulating ring 29.

To said frame piece 26 is electrically connected bya screw 31 to a terminal 32 connected a wire 33 electrically connected to a rheostat 34, the two poles of the rheostat being connected to wires 36 connected to vopposite sides of abattery 37. The rotary member of the rheostat 34 is electrically connected to a wire 38, which is electrically connected to a metal block 39 secured by means of screws 41 to an insulating block 42, secured by screws 43 to the frame 44 of the typewriting machine.

Said metal block carries an adjustable contact 46 which is normally in contact with a contact 47 carried by an arm 48 extending from a rotary disc 49, said arm 48 being drawn downwards, so as to make contact between the contacts 46 and 47, by a coiled spring 51 secured to said arm 48 and to an arm 52 pivoted upon said block, as shown at 53, and having an arcuate slot 54 through which passes a set screw 56 to regulate the strength of said spring 51.

ed to a terminal 58, which terminal is supported by a screw 59 upon a fiber rod 61 embedded in wax 62 cast around solenoids 63. From said terminal 58 extend wires 64 of said solenoids, the other ends of the wires of 'said solenoids extending, as shown at 66,V

Connected to y said arm 48 is a wire 57 electrically connectfront of the contact carriers 19, a spring Contact 23 extending from each Contact 71 and contacting with a plate 74 in contact with the contact 22.

With this construction, when an operator presses a key through the distance between the contacts 22 and 24, and closes the circuit between the said contacts, the corresponding solenoid is energized, thereby drawing upwards the core 76 oit said solenoid and the rear end oil the key Vlever 13, the trent end then descending and completing the depression of the key bar 6 and actuating the type bar 77 by means of a link 78 pivotally connected to said key and type bars.l Before, however, the core 7 6 strikes a rubber stop 78, a protuberance 79 on the type bar strikes against an end ot a shifter S1, the other end or' which impinges against a roller 82 on a lever 83 and draws said lever 83 out of engagement with an escapement wheel 84, allowing the escapeinent to operate the carriage carrying the typewriter platen 86, so that the platen moves slightly; at the saine time, the roller 82 operates an arin 87 secured to thedisc 49 and breaks a circuit between the contacts 46 and 47. Although the circuit is broken through the solenoid, the core still moves upwards, due to its momentum, and the type bar moves onward towards 'the typewriter roller 8G, until the core is arrested by striking the lower end of the rubber stop 78 secured to a nietal stop 88 screwed into the upper portion ot the casing 89 for the solenoids and locked therein by a lock-nut 90. Even after the core is arrested by striking the rubber stop 71, the type moves Jforward to the roller S6 due to the ieXibility of the type bar and makes an imprint upon the roller. Then, by reason of itselasticity the type bar immediatelyy rebounds troni the roller and is drawn back to its original position against a flexible cushion 91, due to the ordinary spring 91 for retracting the type bar. These springs can be made very much stronger than with an ordinary typewriter so that type bars can be made to come back very much more quickly than the type bars of an ordinary typewrite thus increasing the range of speed ot the operator. The power for overcoming said springs, being not now dependent upon the Xertioii o1l the operator, but being derived from thek electric circuit, can be greatly increased without in the slightest degree increasing the work o' the operator.

The talling back ot the type bar 77 to its normal position ot rest upon the rubber cushion 91 raises the key lever 13 and thereby raises the Contact carrier 19, breaking the circuit between the contacts 22 and 24. But in order 'that the circuit between the contacts 46 and 47 may not be closed again be foire the circuit between the contacts 22 and 24 is opened, I provide an arm 92 secured to the disc 49 and carrying an adjustable weight 93. The purpose of this arm is to increase the swing of the disc 49, taking place in the time elapsi; betveen the opening between the contacts 46 and 47, and the opening between the contacts 22 and 24 and resisted by the coiled spring 51. But tor this arm and weight, the spring 51 would actuate the arm 48 to close the contacts 46, 47, before the type bar has resumed its normal position, that is, before the contacts 22, 24 were opened, which would again energize the solenoid and cause an indefinite succession ct', impacts of the type bar against the typewriter roller. By supplying thc weightd arm 92 to the disc 49, the distance through which the disc swings is rendered so great as to cause the circuit between the contacts 46, 47 to close after the circuit bee tween the contacts 22, 24, has been opened. 4 indicates a spacing bar connected to an end o1- a spacing lever 96, the other end of which is connected to an end oit a rod 97, the other end of which is connected to an end ot a lever 98, pivoted at 99, the other end of said lever being connected to an end of a link 101, the other end 102 ot which is forked and engages a knob 103 on the lower end of the escapement lever S3, whereby said escapeinent is actuated by the depression or said spacing bar. rllie spacing bar is also connected to a. hanger, which is supplied with contacts 22, 24, a lever 19, and solenoid G3, the same as the keys 4.

llhe shift key 104 is likewise supplied with a hanger, contacts 22 24, lever 19 and a solenoid 63, but the shirt key, not being connected to any type bar, does not in operation swing the disc 49 and open the circuit between the contacts 46, 47, but the circuit between these contacts remains closed until it is opened by the operation ot a letter key.

Then it is desired to turn the platen, instead of shitting it longitudinally, the rack 106 is withdrawn from the escapeinent wheel 84 by means of an arm 10S (Fig. 8), having an upwardly extending linger 109 adapted to be moved by the o1erator into engagement with a spring-actuated dog 111, to hold it in the upper position, the upward movement of the arni being limited by a stud 11 extending through a hole 113 in said arin. Said arm is attached at its lower end to a slide piece 114, in which said rack 106 slides. The arm 108 is normally drawn into the po-4 sition in which said rack 106 eng is said escapenient wheel 84 y coiled springs 11G. The rack 106 being drawn out ot engagement with the escapeinent wheel 84, the platen is given a rotary motion by means oi a pawl 117, pressed by a spring 11S against a stop 119 and carried by a lever 121 attached to a link 122, secured at its lower end to a longitudinally extending bar 123 resting upon arms 124, pivoted upon 'the shaft 14 and drawn downwardly by springs 126, said bar 123 extendingover the levers 13, soy that, when en one of the levers 13 is rocked upwards about its pivot 14, the bar 123 is raised, thereby withdrawing the pawl from a ratchet wheel 127 attached to the platen, so that a downward movement of the bar actuates the pawl to advance the platen through any desired angle. not desired to use the means for advancing the platen circumferentially, the bar is held in a continually raised positionby turning the arm 124 on the shaft 1st and holding them by set screws 128. l claim t* 1. ln an electric typewriting machine, th combination of a pivoted key bar, a contact moved thereby, a second contact, from contact with which the first-named contact normally held by said key bar, an electro-V magnetic device energized by the closing oi a circuit through said contacts, a type bar moved toward the platen of the typewriting machine by the energization of said electrov i magnetic device,`and a normally closed sect in said electric circuit and opened by the movement of said type bar toward the platen of the typewriting machine, and a weighted device movable with the movable contact of said second pair.

3. ln an electric typewriting machine, the combination of a pivoted key bar, a contact moved thereby, a second contact, from contact with which the first-named contact is normally held by said type bar, an electro` f. magnetic device energized by the closing of a circuit through said contacts, a lever moved by the energization of said electromagnetic device, the movement of said lever depressing` said key bar, a type bar actuated by the depression of said key bar, and a normally closed second pair of contacts in said electric circuit and opened rby thefmovement oi? said type bar toward the platen of the typcivriting machine.

e. ln an electric typewriting machine, the

combinationo' a pivoted key bar, a contactv moved thereby, a second contact, from conn When it isk tact with whichv the first-named contact is l normally held by said key bar, an electromagnetic device energized by the closing ol a circuit through said contacts, a lever moved by the energization of said electromagnetic device, the movement of said lever depressing said key bar, a type bar actuated by the depression of said key bar, a normally closed second pair of contacts in said electric circuit and opened by the movement of said type bar toward the platen of the .said lever depressing said key. bar, a type bar actuated by the depression of said key bar, and a normally closed second pair of contacts in said electric circuit and opened by the movement of said type bar towards the platen of the typewriting machine.

6. ln an electric typewriting machine, the

combination of a pivoted key bar, a hanger attached thereto, a pivoted contact carrier, a contact carried thereby, a second contact, from contact with which the rst-named contact is normally held by said hanger, an electro-magnetic device energized by the closing oia circuit through said contacts, a lever moved by the energization of said electro-magnetic device, the movement of said lever depressing said key bar, a type bar actuated by the depression of said key bar, a normally closed second pair of contacts in said electric circuit and opened by the movement of said type bar towards the platen of the typewriting machine before the type bar impinges on said platen.

7. In an electric typewriting machine, the combination of a pivoted key bar,'a contact moved therewith, a second contact from contact with which the first-named contact is normally held by said key bar, an electromagnetic device energized by the closing of said contacts by movement of the key bar, a

rtype'bar moved toward the platen ofthe typewriting machine by the energization of Said electro-magnetic device, said electric circuit being opened by the movement of saidtype bar toward the platen of the typewriting machine. f

n EDWARD H. HEBERN.

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