US1615540A - Typewriting machine - Google Patents

Description

Jan. 25,1927. 1,615,540

G. G. some TYPEWRITING MACHINE Filed April 16, 1924 2 Sheets-Sheet 1 J ATTORNEY YINVENTOR Janj 25, 1927. 1,615,540:

G. G. GOING lled April 1 1924 2 Sheets-Sheet 2 Patented Jan. 25, 1927.

UNITED STATES GEORGE GOULD GOING, OF MIDDLETOWN,

PATENT OFFICE.

CONNECTICUT, ASSIGNOB TO REMINGTON- NOISELESS TYPEWRITER CORPORATION. OF NEW YORK, N: Y., A CORPORATION OF NEW YORK.

TYPEWRITING MACHINE.

Application filed April 16, 1924. Serial No. 706,847.

This invention relates to typewriting machines, and more particularly to front strike machines in which pivoted type bars are employed.

The object of this invention, generally stated, is to provide an improved construction for type bars and their actuating connections which is functionally and structurally efficient, economical and readily manufactured.

Another, and more specific, object of the invention is to provide a typewriting machine with type bars each of which is of the lever type arranged mechanically to be converted, while being actuated, from a lever of one class to a lever ofanother class, whereby the printing takes place in a quick and efiicient manner, substantially without noise. 1

From another and more specific point of view, it may be said that: an object of the invention is to provide a pivoted type bar comprising a plurality of sections which travel together as one part with a pivotal movement throughout the first portion of its printing stroke, .and in which means are provided to change the relation of the sections at the last portion of the printing stroke and to apply a substantially noiseless pressure imprint by a leverage action and through the power exerted by one section of the type bar on another.

To the above and other ends which will hereinafter appear my invention consists in the features of construction, combinations of elements and arrangements of parts exemplified in the construction hereinafter set forth, and particularly pointed out in the appended claims.

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detail description taken in connection with the acccmpanying drawings in which:

Figure 1 is a diagrammatic view mainly in side elevation, parts being broken away and omitted; the view showing only so much of a typewriting machine as is necessary to arrive at an understanding of my invention in its embodiment therein;

Figure 2 is a like view showing a type bar swinging into printing position;

Figure 3 is a like view showing a type bar it appears when effecting an imprint; Figure 4 is a fragmentary front elevation of a portion of the typewriting machine, showing the manner of mounting the type bars; and

Figure 5 corresponds to Figure '3 but shows a modified form of type action constructed in accordance with this invention.

Referring now to the drawings, and particularly to Fig. 1, 10 denotes the frame of a typewriting machine having key levers 11 pivoted at 12 and arranged to actuate the sub-levers 13, which are pivoted at 14 adjacent the rear portion of the frame of the machine. Each key lever may be operatively connected to the associated sub-lever 13 by any suitable means, as by a pin and slot connection 11, 13. What ma be termed a two-part type bar is indicated generally at 15, each type bar being pivoted at 16 to a suitable support or segment 17 se cured in the frame of the machine. Each type bar 15 has a. lever arm 18 at the heel thereof connected by means of the link 19 with the upstanding arm of the sub-lever 13.

The segment 17 is generally a-rcuate in shape and is preferably disposed in a vertical plane, the arrangement being such that the type bars 15 are arranged about a common printing center. To compensate for the diflerence in width between the system of key levers and the system of type bars, the upright arms of the sub-levers 13 at the sides of the system may have an inwardly sloping arrangement.

Each ty e bar comprises a part or section 20 pivotal y supported at 16 to the segment 17. To the section 20 is pivoted or otherwise articulately attached a section or part 21 which carries the type head 22 fixed there- I on and with types constantly maintained at the front or advancing side of the type bar. The pivotally mounted section 20, as indicated, preferably has a double construction provided with portions which straddle the associated sector 23 that is rigidly attached to or forms part of the support or segment 17. The position of the sectors 23 u on the segment 17 is clearly shown in ig. 4. Those sectors, as there shown, are disposed in spaced relation along the arcuate length of the segment so that the medial planes of the sectors 23 all converge at the point of convergence of the type bars when the lat ten are in printing position. In Fig. 4 the portion of the two-ply section 20 on one side of its sector 23 is designated at 20, the portion on the other side being designated at 20".

The sections 20 are all mounted on a common pivotal member or wire 16 which passes through bearing openings in the sectors 23. This specific form of construction while convenient, however, is not essential to the practice of this invention. The articulated section 21 of each type bar is pivoted at 24 be tween the two side portions 20 and 20" of the companion pivoted section 20, and has a depending heel 25 which rides on the outer or curved surface of the associated sector 23 which is concentric with the pivot 16. The sides of each section 20 are united by a stop 26 against which the upper side of the companion articulated or type carrying section 21 bears when the type bar is in the retracted position, as shown in Fig. 1. This is in order to hold the section 21 rigid with the pivoted section 20 as long as the heel 25 iears on the curved surface of sector 23. Each side 20, 20" of each section 20 is also preferably provided with a. weighted member 27 which, as shown, projects behind the companion articulated section 21, and is adapted to impart energy to the articulated section 21, particularly near the end of the printing stroke. A spring 28 is provided on each typebar to hold the articulated section yieldinglyin engagement with stop 26 and tends to-maintain this normal relation between the sections except when such relation is changed. as will hereinafter appear.

The articulated section 21 of each type bar is provided with an outwardly extending arm 30 at its free end, which arm is adapts ed to contact with a stop 31. This stop is here shown as rigidly secured to the frame 10 of the typewriting machine adjacent to the platen 32 just over the printing center. The stop 31 is preferably provided with a felt pad or other soft surface 33 which is ada ted. to absorb with little noise the force of t e impact of the arm 30 against it when the type barswings to printing position. Fixed 111 spaced relation to the stop 31 is a bar or fulcrum 34. This fixed bar is so situated that during the movement of a type bar from the Fig. 2 to the Fig. 3 position. the arm 30 on the type bar will move up between the stop 31 and the bar 34. During the first portion of this-movement of the type bar from the Fig. 2 to the Fig. 3 position the section 21 of the type bar will turn on the surface of the pad 33 as a center between it and the bar 34. Said bar 34, however. acts as the fulcrum for the articulated section 21 of the tvne bar to turn on while a type is being pressed against the platen or the paper thereon and to resist a movement of the outer end of such action away from the platen. A soft pad or rest is provided at 35 for the type bars when in retracted position.

The operation of the type action is as follows:

When a key lever 11 is depressed, the upstanding arm of the companion sub-lever 13 swings in a backward direction and imparts a pull through the intermediate link 19 to the lever arm 18 of the associated type bar 15. This pull on the lever arm 18 swings the typebar 15 from the retracted position shown in Fig. 1 toward the printing posi tion, shown in Fig. 3. During the entire movement of the type bar until it reaches substantially the Fig. 2 position, the articulated section 21 of the type bar operates as though it were rigid with the section 20 by reason of the heel 25 riding on the curved surface of companion sector 23. When the type bar 15 has reached a position where the arm 30 just contacts with the padded stop 31, the rigid relation of the articulated section 21 with the pivoted section 20 of the type bar comes to an end, since the length of the curved surface of thecompanion sector 23 and the length of the heel 25 are so proportioned that they no longer co-act; the heel 25 leaving the curved surface at this point. In Fig. 2' the heel 25 is clearly shown as justleaving the curved surface of the as .sociated sector 23 as the arm 30 makes contact with the stop. 81. As the upper end of the type bar has now come to rest againstv the stop 31. the breaking of the type bar at the point 24 of articulation now takes place. The pivoted. section 20 still moves rearward underthel momentum of the parts and the key depression, while the arm 30 at the upper end of the type bar moves up hehindihe bar 34 as shown in Fig. 3. During the movement of" the parts from the Fig. 2 to the Fig. I position, the pivot 24 becomes the point at which power is applied (from the key and the intermediate parts controlled thereby) to the section 21, which acts as a lever of the second order when effecting an imprint.

Thus the arm 30 during printing operation re-acts against the bar 34 which is station ary, and therefore it becomes the fulcrum while the work. i. e.,'printing, is donc by pressing a ty 2 face against the paper on the platen 32. uring the movement of the type bar 15 from the'position shown in Fig. 1 to the position shown in Fig. 2. the double member 27 acquires considerable momentum. and imparts some of its'acquired energy. when the position shown in Fig. 2 is reached the member 27 beginning at this time to function most effectively. The momentum of member 27 and the pivoted section 20, as

well as thepower-"imparted from the depression of the key lever, applies power at the point 24 of articulation which acts to effect a pressure imprint by 'a leverage action on the section 21. The spring 28 serves to take the tension 011' the bar 34 as soon as printing is accomplished and the finger key is released and quickly to bring the type bar sec.-

tions back to normal relation with reference to each other.

Mechanically considered. the two-part type bar 15 acts as a lever of the third order when initially actuated as it is swung bodily as one part about the pivot 16 as a fulcrum, both sections 20 and 21 while in rigid relation being mechanically one and having poziver applied to the bar intermediate its on s. with the stop 31 the heel 25 is also out of contact ,with the associated sector 23 and the rigid relation of the sections 20 and 21 no longer obtains. The lever then begins to break at the point 24 of articulation between its two sections, the pivot point about which the section 21 of the lever swings as a fulcrum now being transferred from that at 16 to a point on the stop 31, and finally about the fulcrum bar 34 in the actual act of printing. It is thus seen that the lever which, as initially actuated, operated as a lever of the third order has now been converted to act as a lever of the second order, since in the operation of printing its section 21 is fulcrumed at a point on the stop 31 and finally on the fulcrum bar 34, power being applied at the point of articulation and the work of printingbeing done at an intermediate point, namely, the type head 22. As the type bar approaches the printing center and is broken after having its free end arrested by the stop 31 an imprint is produced by a lever controlled pressure under the action of the key and-the momentum in the parts instead of by a blow or impact. The energy stored by st retching the s ring 28 is utilized, after the character has een printed to restore the sections 20 and 21 of the type bar to normal relation to each other and withdraw the arm 30 from behind the fulcrum bar 34. This of course takes place as the finger of the operator is withdrawn from the key of the lever 11 and pressure which held the arm 30 againstthe bar 34 is no longer exerted.-

In orderto aid in the quick restoration of each key lever 11 and the parts controlled thereby to normal Fig. 1 position, an expan sion spring 36 is supported on the frame and normally bears upward against the companion key lever. The tension of each spring is adJustable by means of a screw 37 which is secured in 'a fixed part 38 secured to the frame of the machine.- Each key lever is arrested in its return movement by a padded stop 39.

In Fig. 5 a modified type action is illustrated. Here the type bar as. a whole is lVhen, however, the arm 30'contacts' again indicated generally by the numeral 15 and comprises a pivoted section 40 and an articulated section 41. The section 40 is a single member pivoted at 42 and having a lever arm 43 adapted to be actuated by the pull rod 19. The articulated section 41, as indicated, is pivoted at 44 to the section 40 and is provided with a heel 45. This heel, however, does not bear upon any sector as employed in the form illustrated in Fig. 1. Instead this heel is adapted to contact with --a projecting stop,46 formed on the side of the pivoted'seetion 40, although the articulated section does not have the heel 45 normally bearin against this stop, as 'is indicated in dotted lines in Fig. 5. This result is brought about by a contractile sprin 48 connected at one end to the section 20 an at its other end to the section 21. The power of this spring is exerted to draw the outercnd or front portion of the'articulated section 41 against a stop 49, which is formed by a bent-up tongue on the pivoted section 40, and to normally maintain the heel 45 away from the stop 46. The section 40 is provided with a member 47 adapted to acquire energy and spend the same in applying power at the point of articulation when the outer end 50 of the type bar comes into contact with the stop 51 adjacent the platen 32. In this form of type action the reaction of the spring 48 against the paper to effect an imprint substantially without noise.

The stop 46 and heel 45 serve at the linal portion of the printing stroke to rigidly unite sections 40 and 41 of the type bar in eti'ectingan imprint so that momentum imparted to the moving parts and positive key pressure or the impetus thereof as well, may be effective to produce pressure printing.

Certain of the stops and rests above described are shown in the drawing as provided with cushioning means, since-it is desirable that these parts shall absorb the energy of motion which the moving parts arrested possess, in as silent a manner as pos sible. It willbereadily understood that from the'broa'd'er aspects of my invention such cushioning means are not essential to the practice of this invention. especially if the substantially noiseless operation of the type action is ignored.

It will also be Understood that while but one key lever, type bar, etc, has been described in' the-typeaction disclosed this has been done in the interest of-clearness. Such disclosure accordingly should be taken as indicative of the plurality of such instrumenof the type bar for applying power always in constructions embodying this invention.

Various changes may be made without departing from my invention as it is defined in the accompanying claims.

What I claim as new and desire to secure by Letters Patent is 1. In a typewriting machine, the combination of a printing key, a type bar adapted to be swung towards printing position by said key and comprising a pivoted supporting section and a type-carrying member carried thereby and extending outwardly therefrom substantially in alignment therewith and movable relatively thereto, a padded stop disposed in the path of the type-carrlying member at a point relatively near t e printing position, and means intermediate said key and said pivoted supporting section fronr such section to the type-carrying member to continue its motion after arriving at the stop and thus efiect a pressure imprint from the type theron.

2. In a typewriting machine, the combination of a two-part type bar fulcrumed at one end to swing towards printing position, and means by which the opposite free end of the type bar is automatically and substantially noiselessly arrested while an intermediate part thereof may thereafter continue its motion in the same general direction to printing position around a fulcrum at or near the point of arrest of the free end of the bar.

3. In a typewriting machine, the combination of a platen, a type bar comprising two sections pivotally united, a. pivot on which one of said sections is mounted and about which both sections turn together, a type carried by the other or outermost section, a padded stop for substantially noiselessly arresting the free end of the type-carrying section before it arrives in printing position but permitting the other or pivotally connected end portion of said type-carrying section to continue its movement to effect an imprint during a relative movement between said sections, and means for preventing the free end of'the type-carrying section from moving away from the platen during the printing operation.

4. In a typewriting machine, the combination of a type action comprising a printing key, a type bar actuated. thereby and comprising two pivotally united sections that turn together around a fixed pivot at one end of the type bar throughout most of the printing stroke, and means for causing the outermost section to coact with and turn around a fixed fulcrum arranged above the printing point and coacting with the other or outer free end of the type bar and thus complete the printing movement.

5.-In a typewriting machine, the combination of a pivoted type bar comprising two sections one of which is a type-car ing section, and means for positively hol ing said the type reaches the printingpolnt, said means including means for substantially noiselessly arresting the outer free end of the type-carrying section of the bar before the type theron reaches the'printing point.

6. In a typewriting machine, the combination of a type bar pivoted at its inner end to turn on a fixed pivot and comprising two pivotally connected sections that extend longitudinal y in the same general direction and the outermost one of which is a typecarrying section, and means for causing said sections to turn together throughout most of the stroke of the type bar and for substantially noiselessly arresting the outer free end of the type bar and causing it to complete its printing movement by turning the type-carrying section on a fixed fulcrum at or near {)he point of arrest of the free end or the type 7. In a typewriting machine, the combina tion of a pivoted type bar comprising an innermost pivoted supporting section and a type-carrying section connected together to move relatively one to the other, means for positively holding said sections to move together throughout the greatest portion of the operation of the type bar, a padded stop coacting with the outermost section to sub-' stantially arrest the outer free end thereof but permit a continued turning movement of suchsection aroundsaid padded stop to complete the printing movement of the type bar and effect an imprint, and a fixed member with which the outer free end of the type bar isybrought into co-operation to resist a movement of the outermost member away from the platen as a pressure leverage action imprint is being produced.

8. In a typewriting machine, the combination of a platen, a type bar, a pivot at one end of the .type' bar, a key, key-controlled actuating means'for' turning the type'bar throughout most of its stroke around said pivot at one end ofsthe type bar,'a stop 00- operative with the opposite or free" end of the type bar to prevent the type from striking with an impact against the platen, and a fixed fulcrum with which the free end of the type bar is brought into co-operation after it coacts with said stop and which resists the movement of the free end of the type bar away from the platen, said key controlled means exerting power on the type bar against the resistance of said'fixed ful-' crum to complete the printing stroke and effect a pressure imprint by a leverage action against the platen.

9. In a typewriting machine, the combi nation of a platen; a type bar comprising a section mounted to turn on a fixed pivot, and a second section articulated to the first mentioned section and carrying a type head fixed thereon and with types constantly maintained at the front or advancing side of the type bar; means for actuating said type bar; positively acting means coact-ing with said sections forpositively maintaining them in rigid relation during a predetermined portion only of the swing of the type bar around said fixed pivot and until the type head is close to the printing point after which said last mentioned means is ineffective to maintain such rigid relation; and means for causing a relative movement between said sections after the positively acting means are no longer effective and for permitting a continued movement of the type to effect an imprint during the said relative movement of the sections.

10. ]n a typewritingmachine, the combination with a type bar comprising a section mounted to turn on a fixed pivot and asecond section articulated to the first section and provided with a depending heel, of means for actuating said type bar, and means coacting with said depending heel to positively maintain the sections in rigid relation only until a predetermined point is reached in the swing of the type bar toward printing position around said fixed pivot, so that the rigid connection between said sections may break before the final part of the printingmovement of the type bar.

11. In a typewriting machine, the combination with a type bar comprising a section mounted to turn on a fixed pivot and having a weighted member and a second section articulated to the first section and having a depending heel, of means for actuating said type bar, and means including a curved fixed surface coacting with said heel to pose itively maintain said sections in fixed relation during a predetermined portion only of the swing of the type bar toward printing position around said fixed ivot.

12. In a typewriting mac ine, the combination with a type bar comprising a section mounted to turn on a fixed pivot and arranged to receive energy and a second section articulated to the first section and having a depending heel, of means for actuating said type bar, a fixed device having a curved surface arranged to coact with sa'd heelduring a part only of the swin ing movement of the type bar around said xed pivot, and a stop on said first mentioned section whereby the articulated section is positively maintained in rigid relation with the first named pivoted section while the heel is in contact with said curved surface.

13. In a typewriting machine, the combination with a key lever, of a type bar arranged to be actuated thereby comprising a pivoted section and a second section articulated to the first section, means for maintaining said sections in rigid relation until a predetermined point is reached in the swing of the type bar toward printing position, and means for fulcruming the said second section of said type bar at a point above the printing center before the type reaches the printing position.

14. In a typewriting machine, the combination with a key lever, of'a type bar having actuating connections to said key lever, said type bar comprising a pivoted section and a second section articulated to the first and having a depending heel, a device having a surface arranged to co-operate with said heel to maintain the sections of said type bar in rigid relation during a predetermined portion of the swing of the type bar to printing position, and means for fulcruming the said second section of the type bar at its outer end when said heel ceases to contact with. said surface.

15. In a typewriting machine, the combination with a key lever, of a type bar having actuating connections to said key lever, said type bar comprising a pivoted section having a stop and a second section articulated to.' the first section and having a dependin heel, a device having a surface adapted to co-operate with said heel and ar-- ranged to cause said articulated section to engage with said stop and maintain said sections in rigid relation during a predetermined portion of the swing of the type bar toward printing position, and means adapted to coact with the outer end of said second section when said heel no longer engages said co-operative surface, said last named means operating to arrest the motion of the outer end of said type bar.

16. In a. typewriting machine, the combination with a key lever, of a type bar having actuating connections to said key lever and comprising a pivoted section having a stop and a second section articulalted to the first and' rovided with a depending nation with a key lever, of a type bar having actuating connections to said key lever and comprising a pivoted section having a stop and a second section articulated to the first section and 1provided with a depending heel, a device aving a curved surface adapted to co-operate with said heel and arranged to cause said articulated section to engage with said stop and maintain said sections in-rigid relation for a predetermined portion only of the swing of said type bar toward printing osition, and means mechanically control ing the sections of said type bar so as to act as a lever of one class at one part of the printing-stroke and to operate with leverage action of another class at another point of the stroke by providing a transfer of the fulcrum point around which one of said sections turns.

18. In a typewriting machine, the combination with a key lever, of a type bar having actuating connections to said key lever and comprising a pivoted section having a stop and a second section articulated to the first section and provided with a depending heel, a device having a curved surface adapted. to co-operate with said heel and arranged to cause said articulated section to engage with said stop and maintain said sections in rigid relation for a predetermined portion only of the swing of said type bar toward printing position, and a stop device coacting with the upper end of said articulated section and arranged to engage therewith when said heel leaves said curved surface, whereby the fulcrum point of said articulated section is transferre from the inner to the outer end of the type bar and a pressure imprint by a leverage action is effected.

19. In a typewriting machine, the combination with a key lever, of a type bar hav ing actuating connections with said key lever and comprising a pivoted section having a stop and a weighted member adapted to receive energv and a second section articulated to the first section and provided with a depending heel at its lower end and an arm at its upper end, a device having a surface of such length as to coact with said heel and maintain said second section against said stop in rigid relation with said pivoted section for a predetermined portion oniy oi" the swing of the type bar toward printing: position, and a fixed stop disposed in the path of the swing of the upper end of said second section and adapted to engage therewith when said heel disengages from said coacting surface, whereby the lever action of said second section becomes mechanical! inverted, the fulcrum being transferred to the outer end of the second section, the power being applied by said weighted member at the point of articulation between the two sections.

In testimony whereof I aflix my signature.

GEORGE GOULD GOING.

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