US2308461A - Noisless electric printing machine - Google Patents

Description

Jan. 12,1943. T. H. TALLEY NOISELE SS ELECTRIC PRINTINGMACHINE 2' Sheets-Sheet 1 Filed March 6, 1959 2 ww ww m\ \N\ 8 gm m3 N. Q3

v ates the electric switch.

atented Jan. 12, 1943 STTES'FPATENT cFFIC I w 2,308,461 7 NOISLESS ELECTRIQ PRINTING MACHINE Thurmon H. Talley, Syracuse, N. Y. Application March 6, 1939, Serial No. 260,072

' 25 Claims. lCl. 191-114) This invention relates to silent or noiseless electric typing or printing machines and the like, and one object is to reduce the sharp click-click irritating noise produced by the impact of the type head on the platen in Another object is to employ quick acting electric impulses to do the heavy work of operating the machine to reduce fatigue and conserve the nerves and energy of the operator so that he can produce more work with greater accuracy.

Other objects are to increase the speed of the machine and the operator, and to give an even density of impressions of the type on the printed sheets and 'especiallyon the carbon copies.

Still other objects are to simplify construction thereby reducing the cost of manufacture. and to employ a type power which allows the operator to maintain the'accustomed rhythm or feel that he has become accustomed to on manually operated machines.

Still other objects are to produce a goodly number of clear carbon copies and cut stencils for duplicating machines by a short stroke and sharp impact to shake the carbon loose for clear impressions, a function not possible in the "squeeze method" type of silent machines, and also to provide a means to minutely regulate and control the power exerted upon the type bar, as excess power exerted unnecessary noise.

In the accompanying drawings:

Figure 1 is a longitudinal sectional ing a key and corresponding type-carrier or type bar at normal position and also shows the various stages of a type bar in action, or the'diflerent stages of the relayed stroke of the type bar. Figure 2 is a rear view of the tie-bar support upon which is mounted the type-bar base and part oi the type bar power-operating mechanism Figure 3 is a fragmentary view of the same tiebar showing a rear view or the switch actuating mec,'also a plan view oi. the switch. v

Figure 4 is a plan view of the key actuating mechanism and associated parts.

Figure 5 is a plan view oi the switch, also showing elongated holes in the switch support bracket to provide adiustment for the switch.

Figure 6 is a fragmentary view of the type bar and associated power-actuating mechanism showing how the movement of the type bar actu- It is common practice in type-bar writing machines to eflect printing by having the type bar travel a long continuous accelerated-- stroke 55 the key-levers properly,

the printing action.-

upon the type bar means loose fromits paper base;

quired for a clear to the slam" of a door, an 1 door slam 5 companying the spirit and scope thereof.

or a plurality of -L.

from the normal position of the type bar to the platen, and this long stroke issomewhat similar the noise of the has been successfully reduced by means of a door-check" utilizing a relay principle. Therefore, a somewhat similar principle is incorporated in this mechanism to reduce the noise caused by the slam" oi the type bar against the platen. However, as the type bars must travel so fast, springs and similar mechanical means oi the. door-check would be entirely too-slow. Therefore, in this machine the speedy electric impulse is utilized for the power-relayed short stroke, after has been retarded.

The squeeze-bar produce a sufficient number oi carbon copies, because it takes a slight impact to jar the carbon therefore, this machine provides a short, sharp impact to jar the carbon loose from its paper base, and a rheostat is wired in provide means for exerted upon the minutely regulating the power impression of the type, also to eliminate excess power exerted upon the type bar, as the excess power causes unnecessary noise. The foregoing and other objects of the invention, together with means whereby the same may be carried into effect, will best be understood frcm the following description oi certain forms or embodiments thereot illustrated in acdrawings. It will be understood, however, that the particular construction described and shown trative purposes merely. and that the invention, as defined by the claims hereto appended, may be otherwise practiced without departing from I and 5 are the side-frames having right angle projections 2 formed on the lower part thereof near each end, to which projections are .secured rubber feet 3 to support the machine. The front ends of side-frames I and 5 are formed into right angle projections 4 extending inwardly, and a tie-bar or .key-lever-support plate 0 is'interposed between the side-frames l and 5 and secured at each end to ing projections 4 by means of screws 1. A series shaped key lever spacing projections ii are formed on the upper edge of the tie-bar or key-lever support plate 6 to space the long stroke method used present forms of silent typewriters makes it diiiicult to series with the electric magnet to" type bar to the amount rehasbeen chosen for illus-- the inwardly extendand these L shaped protherein beneath each key-lever, and the lower end of each key-lever spring is engaged in its respective hole so that said spring will hold the associated key-lever in normal position. A manipulating key i6 is formed on each key level 9, and the free ends of key levers 9 extend between teeth formed on comb-member 11, formed at right angles on a tie-bar l8, a resilient bumper I9 being secured to the upper portion of the comb member I! and a key-lever stop being secured to the lower part thereof by rivets or screws 2|. The tie-bar i3 has right angles formed on each end thereof and is secured to side frames i and 5 by means of screws 22. Support-studs 23 are mounted on tie-bar it and levers 2d are pivotally supported on the upper ends thereof by rivets 25. Links 26 are carried by the forward ends of levers and the free end of each key lever 9 is engaged in its respective link. A slot 21 is formed in the rearwardly extending portion of each lever 24; and a stud 28 mounted on an elbow-shaped arm of each type-bar 29 engages in said slot 21. A stud 3!! is also mounted on the upper portion of the elbow-shaped arm of each type-bar 29 and is engaged by one end of a toggle-spring ill the opposite end of which is pivotally supported on an arcuate pivot wire 32 arranged in a horizontal plane and having the ends thereof mounted in tie-bar 33. An angle is formed on tie-bar 33 to make it rigid, and right angle projections 3d are formed on both ends of said tie-bar with holes therein and secured to side i and 5 by means of screws 35. A typemar supporting base-casting 36 is also supported on tie-bar 3t and secured thereto by screws having slots 38 milled in said base-casting, and type-bars 23 are mounted in said slots and pivotally supported on pivot wire shaft $9 in a milled and broached slot 66. On the upwardly extending arm of type-bar 2% is mounted type ll on type head t2, and type-head "it rests against a rest. lent cushion 63 mounted in groove l l in casing 45. 46 represents the platen that carries the paper to be printed upon. A means is provided for retarding the long stroke of type-bar 2d just before it strikes the platen 56 and also relaying or continuing the stroke to complete the printing action of the machine under electric power generated by an energized solenoid electric magnet, comprising a projection t? formed on the pivotally supported type-bar 2E5, so that when type-bar 29 is started in motion toward platen 46, said projection ll passes under strilren-table 48, which has a resilient pad 39 on the under side thereof, and strikes on a resilient pad "Jail on top of a spring supported switch-operating table 5i, thus retarding or momentarily stopping the stroke or motlornof the type-bar before said type-bar is forced through the printing action by electric power. Striker-table ill is ac cured on the end of shaft 52, and the spring supported switch-operating table at is sliclably mounted on said shaft 132. A guide-shaft tit is mounted in said switch-operating table 5i and extends through a hole in base-casting 35, a

0n the lower edge of the tie asoacci spring 53 being mounted on guide shaft $3 to hold the switch-operating table 5! in the nor mal position shown in Figure 3, and in the dotted line position G of Figure 1.

Figure 3 shows the normal position of the spring supported switch-operating table El, and

on the rear of said table are formed two right angle projections 55 and 58 having holes formed therein. 0n projection 55 is secured an insulation member 51 by means of a screw or rivet 58, and a. spring member 59 having a member Bl with a triangular point 52 thereon, is secured to the insulation member 57 by means of rivet 66. See Figures 3 and 6.

An adiustably supported electric switch unit, shown in Figures 3, 5 and 6, is adiustably supported on an L shaped bracket t3 secured to tie-bar support 33 by means of rivets all, said switch unit comprising a base plate 55 of insulation material adjustably supported on L shaped bracket 63 by having elongated holes either in said base plate 55 or in the bracket to so that said switch may be moved up or down to determine the point in the path of travel 0! typebar 29 that the electric power is to exert its force on projection ill on said type-bar ill, and

also the point at which the electric power will be released, or when point 62 will pass point 15 in Figure 6. Said switch base-plate 65 is secured to said bracket G8 by means of screws 66 and nuts thereon, and a binding-post screw 61 having a nut 66 thereon and also having a U shaped head (39 is mounted in the upper portion of insulation-plate 65. Another binding-post screw 10 having a nut ll thereon is mounted in the lower portion of said insulationplate 65. and the head of said binding-post screw it is formed into a contact point it. A movable contact member 16, having a triangular shaped head 15, is pivotally supported between the arms of the U shaped head 69 on bindingpost screw Fill, and a spring member H3 mounted on binding-post screw 87 keeps the movable contact it separated from contact point 13, ex-

cept when point 62 on member 8| is forced against point it on member It to close the electric circuit. When point 62 passes point 1 spring member it forces member is upward, thus breaking the electric circuit.

. A means is provided whereby the movement of a type bar automatically actuates the switch, see Figures 1, 2, 3 and 6. When the type bar reaches the position B the formation 61 strikes the switchactuating table 5|, thus compressing spring 54 to the position shown in Figures 1 and 6, and also causing member 6| to force contact member M to compress spring it and cause contact member 14 to engage contact point it, thus closing the electric circuit. At this point the switch-operating table 5i rests on a radial shoulder 19 formed on shaft iii, which shaft 92 is slidably engaged in a bushing ii mounted in base-casting 36. A spring it is mounted around bushing Ti and interposed between said base-casting it and the radial formation is on shaft 52 to hold striker-head M in normal position, and on the lower end of shaft 52 is mounted a U shaped head with a small shaft 82 mounted in the arms thereof, a resilient cushion iii being interposed between said U shaped head and the base-casting.

A power means is provided to pick up the action at this point by furnishing electric power in the form of quick-acting electric impulses to pick up the retarded movement of the type bar 29 and force it through the printing action and to further arms St on the shaft 2,808, idi

holes Still and we are actuated independently of actuate the electric switch and force point E2 to pass point it, thus allowing spring it to disengage point it from point it, thus breaking the electric circuit. The electric power also actuates the spacing mechanism and other race 1.: through arm ltd having said mechanisms connected thereto.

This power means consists of a solenoid electric magnet as mounted between the arms 83 on bracket 85, said arms being secured thereto by screws 85, and bracket 85 being riveted to sideframe i. in the upper end of magnet 83 is mounted a plug 8'5 and in the lower end of said magnet 83 is slidably mounted an armature plunger 88 having an L shaped-brass bracket 89 secured thereto by means of a screw 99. A resilient bumper 92 is mounted around said armature plunger t8, and a stud 9| is mounted in said L shaped bracket 88, said stud engaging in a hole in an operating-arm we mounted on the end of an operating-shaft es pivotally supported in brackets i l and Q'l secured to tie-bar 38 by means of rivets at and as or by welding. Said cperat ing-arm Wt is secured to said operating-shaft t8 by means of a hub till mounted in said operating arm and secured to the operating-shaft %8 by means of a pin 32. operating shaft 93 is lug-arm H35 having a hub its mounted therein and secured to shaft or by a pin ml, the free end of said operating-arm we extending between the 52 and engaging on shaft t2 so that when the electric circuit is closed, magnet 83 becomes energized and draws armature plunger 88 into the magnet, thus pulling up on lever idli and causing arm its to pull shaft 52 downward to cause striker-table d3 to strike projection dion type-bar 2a with a quick impact,thus forcin typ bar is from position to position D with sufiiclent force to jar the carbon loose for several copies, if desired. A rheostat lid is wired in series with magnet E3 to minutely regulate the power or intensity of the impact upon the type bar, to produce the desired result, thus eliminating excess power that causes unnecessary noise. When the magnet causes strlker'table dd to strike projection 61 on type-bar 2% it also forces the switch- On the opposite end of said I also secured another operatoperating table 5i downward, thus forcing point 62 to pass point it on the switch and allowing spring it to break the electric circuit and deenergize magnet t3, whereupon the compressed springs 58 and 5% act to throw the type bar as back to normal position with great rapidity to increase typing speed.

-It is common practice-to use a long spacing key in front of the key vice is provided in this mechanism. The spacerkey use is mounted on the forward end of levers We and lit, in Figure i, and said arms its and lit are mounted-on a pivoted shaft iii. wardly extending arm H2 having a. right angle formation M3 on the free end thereof, is also mounted on said shaft ill, and the free end of arm H2 engages one end of a pivoted arm lid pivotally supported on bracket at by means of a rivet its, the rearwardly extending end of arm lid engaging on a hcolr. member He secured to projection to on switch-operating table ti by means of a rivet i ii. ihus when spacing-hey its is depressed it causes arm lit to force switchoperating table bl downward to cause the switch to close the electric circuit, thus causing the magnet to actuate operating arm ltd. The spacing mecha and other mechanism of the mac bein its by means of connected to said operating a board and a similar dethe type-baraction it means has been provided whereby the amount of power exerted upon the type-bar 29 may be controlled and regulated according to the number of carbon copies desired and this control means consists of a form at rheostat or resistor wired in series with the magnet as and comprising a base H9 oi insulating material secured to one of the side-frames of the machine by means of screws 28, four screw studs lid mounted on base H9 and having nuts iii threaded thereon, a copper or brass bar 522 supported on the upper screw studs, a coil spring of microhm resistor wire E23 mounted on the lower screw ing bar I22 with magnet 83, a cable "5 connecting the microhm resistor wire I23 wlththe electric connecting-plug l26 mounted on side plate I by means of screws lZl, a contact bracket 828 having an extension are resistor wire lid, and also having four right angle formations to engage bar Q22 and form a guide thereon, a block insulating material 130 secured to bracket its by means of rivets lti, and an operating lever its, mounted on insulating block are by means oi a rivet 433.

The machine is operated by setting the rheostat 532 to the desired amount of power re uh-ed, whether for 1 carbon copy-or 6 carbons or stencil cutting, and then depressing key it causing key lever d to pull link at downward until key-lever 9 engages the key lever-stop 2@, thus permitting the machine to-continue the printing action independently or the key-lever, to give uniform type impressions. Before key-lever c has engaged the stop, it has caused lever it to push spring-stud 3d on pivoted type-bar 2% to a point past a center line between the type-bar pivot as and the pivot oi the toggle-spring SI. This movement forces the arms of said toggle-spring toward each other, and when spring-stud 3U toggle-spring 3i begins to passes said linethe expand, thus forcing type-bar 29 toward the platen and when it arrives at position B the projection d? on type-bar 2s engages the switchoperating table 5! and depresses it from position G to position H, thus retarding the momentum of the typc-=bar and at the same time causing point @2 to engage point is thus causing the movable contact point it to engage contact point is, closing the electric circuit and energizing magnet 83. and-also causing the striker-table at to strike projection 61 on type-bar 29 with a short but sharp impact, thus forcing said typebar through the printing action, and springs l8 and 5t, and also forcing "point 62 to pass point HE, thus allowing spring it to break the electric circuit and allc springs it and he to throw the type-bar 29 back to normal position, and to restore the striker-table and switch operating table to normal position.

What I desire to secure by Letters Patent is: l. A printing machine comprising a platen, a

set of key levers, plvotally supported type bars carrying type heads, means connected to said type bars and operable by said hey levers to swing the type bars toward the platen, a lost motion connection between each key lever and the studs i219, a cable connectto slidably engage the coil of solenoid adapted to be energized through the closing of said switch, and means actuated by said energized solenoid to engage the type bar to complete its pivotal movement and force it to the platen to complete the printing stroke.

2. A printing machine comprising a set of key levers, pivotally supported type bars carrying rigid type heads and switch operating projections, a platen, means connected to said type bars and operable by said key levers to swing the type heads toward the platen, a lost motion connec-= tion between each key lever and the associated type bar swinging means to permit the type bars to have a further pivotal movement independently of their respective key levers, an electric switch adapted to be engaged and actuated by the projections on the type bars as said bars approach the limit of their movement toward the platen in response to the movement of the type bar swinging means, a solenoid adapted to be energized through the closing of said switch, and a hammer head actuated by said energized solenoid to strike the projections on the type bars to force the type bars to complete their printing strokes.

3. A printing machine comprising a set of key levers, pivotally supported type bars each carrying a rigid type head and a switch-operating projection, a platen, key lever actuated means connected to said type bars and adapted to swing the type bars and the type heads toward the platen, a toggle spring means connected to ,each type bar and adapted to be placed under tension by the motion of the type bar, a lost motion connection between each key lever and the associated key lever-actuated means to permit the type bars to have a further pivotal movement independently of their respective key levers, said toggle spring means being released through the movement oi! the type bars by the key leveractuated means to move the type heads toward the platen, an electric switch adapted to be engaged and actuated by the projections on the type bars as said bars approach the limit of their movement toward the platen in response to the movement of the key lever actuated means and said spring means, a solenoid adapted to be en-- ergized through the closing of said switch, and means actuated by said energized solenoid to engage the projections on the type bars and complete their pivotal movements and force them to the platen to complete the printing strokes.

4. A printing machine comprising pivotally supported type bars carrying type heads, a platen, means for moving a selected type bar on its pivot to carry the type head toward the platen, yieldable means for retarding or momentarily stopping the selected type bar before it reaches the pivotally supported type bars carrying type heads,

a platen, means actuated by said key levers for moving a selected type bar on its pivot to carry the type head toward the platen, a lost motion connection between each key lever and said means for moving a selected type bar to permit each type bar to have a further pivotal movement independently of said key lever, yieldable means for retarding or momentarily stopping the selected type bar before it reaches the platen and adapted to be engaged by. said type bar when moved toward the platen, an electric switch adapted to be operated by said yieldable means, a solenoid adapted to be energized through the closing of said switch, and means actuated by said energized solenoid to engage the selected type bar to complete its pivotal movement and to force it to the platen to complete the printing stroke.

6. A printing machine comprising key levers,

pivotally supported type bars each carrying a rigid type head and a switch-operating projection, a platen, key lever actuated means connected to said type bars and adapted to swing the type bars and type heads toward the platen, a toggle spring means connected to each type bar and adapted to be placed under tension by the initial movement of the type bar, a lost motion connection between each key lever and the associated key lever actuated means to permit the type bars to have a further pivotal movement independently of their respective key levers. The tension on said toggle spring means being released through the further movement of the type bars by the key lever actuated means to move the type bars toward the platen, yielding means for retarding or momentarily stopping the type bars before they reach the platen and adapted to be engaged and actuated by said proiections, on the type bars, an electric switch adapted to be operated by said yieldable means, a solenoid adapted to be energized through the closing of said switch, and means actuated by said energized solenoid to engage the projections on the type bars and complete their pivotal movements and force the type heads to the platen to complete the printing strokes.

otal movement of the type bar toward the platen,

said movement being permitted by said lost motion connection, yieldable means for retarding or momentarily stopping the selected type bar before it reaches the platen and adapted to be engaged by the type bar when moved by said toggle spring means, an electric switch adapted to be operated by said yieldable means, a solenoid adapted to be energized through the closing of said switch, and means actuated by said energized solenoid to engage the selected type bar to complete its pivotal movement and force the type head to the platento complete the printing stroke. I

8. A printing machine comprising a platen, pivotally supported type bars mounted on an arcuate pivot wire arranged in a horizontal plane, said bars being adapted to swing in converging planes to a common printing point on the platen,

each of said type bars being formed with a forwardly extending crank arm, an arcuate springsupporting rod rigidly mounted forward of the type bars, a series of toggle springs arranged in rearwardly converging planes above said arcuate bar one for each type bar, each of said springs being formed with an arm plvotally connected table to normal ing' position with its spring connection below said arcuate bar upwardly toward its printing position to carry'the spring connection above the said movement of the type bar the spring to approach each said arcuate bar, causing the arms of other against the spring tension and then per-' mitting the spring arms to expand and exert force to move the type head toward the platen,v

a lost motion connection being provided between each key lever and the meansactuated thereby to permit te spring-actuated movement of the type bar independently of the key-lever.

9. A printing machine comprising a platen, pivotally supported type bars mounted on an arcuate pivot wire arranged in a horizontal plane, said bars being adapted to swing in converging planes to a common printing the platen, each of said type bars being formed with a forwardly extending crank arm and with a rearwardly extending switch operating projection, an arcuate spring-supporting rod rigidly supported forward of the typebars, a series of toggle springs arranged in rearwardly converging planes above said arcuate bar one for each point on type bar, each of said springs being formed with an arm pivotally connected to the said arcuate bar and another arm connected to the forwardly extending crank arm of a type bar, key actuated means connected to said forwardly extending crank arm of each type bar and adapted to swing the type bar from its at rest non-printing position with its spring connection below said arcuthe platen, an

gaged and actuated by each type bar as said platen in response type bar swinging means, a

be energized through the closing of said switch, means actuated by said energized solenoid to 12. A printing machine comprising a piston. pivotally supported type bars carrying type heads, means connected to each of said type bars and adapted to electric switch adapted to be en'- bar nears the limit of its movement toward the to the movement of the said engage the type bar to complete its pivotal movement and force it to theplaten to complete the printing stroke, and means for varying the force of the stroke imparted to said type bar through said solenoid.

13. A printing machine according to claim 12, characterized in that adjustable resistance-means is provided in the solenoid circuit for varying the force of the stroke imparted to the type bar through saidsolenoid. I

14. A printing machine comprising pivotally supported .type bars carrying type heads, a platen, an electric switch, means connected to each of said type bars and nected type bar toward the platen, means constructed to cause the movement of each type. bar to actuate the switch, means motion of the type bar as the type head approaches the platen, electrical means adapted to be energized upon the actuation of said switch to pick up the type bar as it approaches the platen and swing to complete the printing stroke, and adjustable means for varying the power exerted on the type bar by said electrical means. 7

ate bar upwardly toward its printing position to carry the spring connection above the said.arcuate bar, said movement of the type bar causing the arms of the against the spring tension and thenpermitting the spring arms to expand and exert force to move the type bar toward the platen, a yielding vertically movable switch-operating table adapted to be engaged and depressed by the said projections on the type bars as said bars approach printing position, a switch adapted to be closed by the depression of the sa d switch-operating table, a striker table mounted above the switchoperating table and adapted to extend over the said type bar protection when said projection is in engagement'with the switch-operating table, a solenoid adapted to be energized through the closing of said switch. and means actuated by said energized solenoid to move the striker table downwardly to engage the sa d projection on the type bar and tomove said projection and the switch-operating table downwardly to force the type head a ainst the platen to complete the printing stroke.

10. A printing machine according to claim 9, characterized in that means operated by the downward movement of the striker table opens the solenoid circuit before the type bar reaches its final printing position.

11. A printing machine according to claim 9,

inoperative positions when the solenoid circuit is broken.

spring to approach each other platen in response i fore the type bar reaches its flnal printing 15. A printing machine comprising a platen, pivotally supported type bars carrying type heads, means connected to each or said type bars and adapted to swing the connected type bar toward the platen, an electric switch adapted to be engaged and actuated by each type bar as said bar nears the limit of its movement toward the to the movement of the said type bar swinging means, a solenoid adapted to be energized through the closing of said switch, means actuated by said energized solenoid to engage the type bar to complete its pivotal movement and force it to the platen to complete the printing stroke, and means operated by the energized solenoid to open the solenoid circuit be- I position.

16. A printing machine according to claim lb characterized in that means are provided to automatically return the said type bar engaging means to normal inoperative position when the solenoid circuit is broken. a

1'7. A printing machine comprising pivotally supported type bars carrying rigid type heads, a

platen, means connected to said type bars and adapted to swing the type bars toward the platen, a toggle spring means connected to each type bar and adapted to be placed under tension by the initial movement of the type bar, said toggle spring means being released through the continued swinging movement of the type bar to move the type bar toward the platen, and power means adapted to be set in operation by the type bars as said bars approach the platen, said power means including means adapted to engage the type bars and complete their pivotal movements and force them to the platen to complete the printing strokes.

18. A printing machine comprising pivotally swing the connected type bar toward I solenoid adapted to adapted to swing the confor retarding the p it into contact with the platen v toward the platen, a toggle spring means con-.

nected to each type bar and adapted to be placed under tension by the initial movement of the type bar, said toggle spring means being released through thecontinued movement of the bars as said bars approach printing position, a spring normally holding said switch operating .table in position, a switch adapted to be closed by the said switch-operating table. a. striker table adapted to extend over the said type bar projection when said projection is in engagement with the switch-operating ,table, a spring normally holding the striker table, a solenoid adapted to be energized through the closing of said type bar by the key-actuated means'to move the 10 switch, and means actuated by said energized type bar toward the platen, and power means adapted to be set in operation by the said pro-- jections on the type bars as said bars approach the platen, said power means including .means adapted to engage the type bar projections and complete the pivotal movement of the type bars and force them to the platen to complete the printing strokes. v

19. A printing machine comprising a platen, pivotally supported type bars mounted on an arouate pivot wire arranged in a horizontal plane, said bars being adapted to swing'in converging planes to a common printing point on the platen, each of said type bars being formed with a forwardly extending crank arm and with a rearwardly extending switch operating projection, key actuated mean connected to said forwardly extending crank arm of each type bar and adapted to swing the .type bar from its at rest nonprinting position upwardly toward its printing position, a yielding switch-operating table adapted to be engaged by the said projections on the type bars as said bars approach printing position, a switch adapted to be closed by the said switch-operating table. a striker table adapted to extend over the said type bar projection when said projection is in engagement with the switchopcrating table, a, solenoid adapted to be energized' through the closing oi said switch, and

40 projection and the operating table downwardly to force the type head against the platen to means actuated by said energized solenoid to move the striker table to engage the said projection on the type bar and to move said projection and .the switch-operating table to force the type head against the platen to complete the printing stroke.

20. A printing machine according to claim 19, characterized in that means are provided open ated by the movement of the striker table to open the solenoid circuit before the type bar reaches its final printing position.

21. A printing machine according to claim 19, characterized in that means are provided operated by the movement of the striker table to open the solenoid circuit before the type bar lost motion connection between each key lever reaches its final printing position. and spring means returns the switch-operating table and the striker table to normal inoperative position when the solenoid circuit is broken.

22. A printing machine comprising a platen,

pivotally supported type. bars mounted on an" arcuate pivot wire arranged in a horizontal plane. said bars being adapted to swing in converging planes to a common'printing point on the platen, each or said type bars being formed with a forwardly extending crank arm and with a rearwardiy extending switch operating projection, key actuated means connected to said forwardly extending crank arm of each type bar and adapted to swing the type bar from its at rest non-printing position toward its printing position, a movable switch-operating table adapted to be engaged by the said projections on the type 5 projections on the Q5 operated solenoid to move the striker .table to engage the said projection on the type bar and to move said projection and the switch-operating table to force the type head against the platen to com- 159 the Printing stroke.

o planes to a common printing point on the platen. a each of said type bars being formed with a forwardly extending crank arm and with a rearwardly extending operating projection, key actuated means connected to said forwardly extend- 5 ing crank arm of each .type bar and adapted to swing the type bar from its at rest non-printing position upwardly toward its printing position, a yielding vertically adapted to be engaged and depressed by the said pe bars as said bars approach printing position, a power means adapted to be set in operation by the depression of the said operating table. above the operating table and adapted to extend 35 over the said type bar projection when said projection is in engagement with the operating table, and means actuated by said power means to move the striker table downwardly to engage the said projection on the type bar and to move said complete the printing stroke.

characterized inthat there is provided means ative before the type bar reaches its final printing position.

25. A printing machine comprising key levers,

5o pivotaliy supported type ba'rseach. carrying a rigid type head and a switch operating projection, a platen, means actuated by said key levers and connected to said type bar to carry the type 7 type bars to have a further pivota'imovement in-- dependent of the key lever, a spring actuated retarding mechanism adapted-to be engaged and actuated by the projections on the type bars. an

M adjustable electric switch actuated by said retarding mechanism, a solenoid magnet adapted solenoid magnet adapted to engage on the promovements and force them to the platen to complete the printing strokes and a spring actuated mechanism adapted to speed the return of the type bars to normal position.

THURMON H. TALLEY.

movable operating table.

a striker table mounted by the downward movement of the striker table to render the power means inoper-

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