US2506702A - Variable feed mechanism for typewriters or the like - Google Patents

Description

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'YI'ORNHI Patented May 9, 1950 VARIABLE FEED MECHANISM FOR TYPEWRITERS R THE LIKE Clifton Chisholm, Cleveland Heights, Ohio, as-

signor of one-fourth to Marie F. Chisholm, Cleveland Heights, and one-half to Henry C. Osborn, Cleveland, Ohio Original application July 20, 1946, Serial No. 685,107. Divided and this application May 29, 1947, Serial No. 751,303

14Claims. (Cl. 197-84) This application is a. division of my copending application, Serial No. 685,107, led July 20, 1946, on a Keyboard operated machine.

The present invention relates to improvements in variable feed mechanisms for a keyboard machine, and more particularly to improvements in variable carriage feed and related mechanisms. The present invention is especially adapted to facilitate the production of justified copy, similar to letter press printing and from which a master printing member such as a planographic printing plate, may be reproduced as, for instance, by a photographic transfer process. These, therefore, are lthe general objects of the present invention.

My prior PatentsNos. 2,165,223; 2,165,224 and 2,165,225, issued July 11, 1939, discloses a` keyboard machine of the general type with which the present invention is concerned. In general,

'such a. machine includes a plurality of individual letter keys for causing a. copy to be reproduced as in an ordinary typewriter. However, a plurality of spacing keys are also provided. These space keys are arranged to space the words a varying distance from each other as, for instance, by any selected number of units from four to eighteen as desired. Further, the mechanism is arranged to utilize printing type of varying widths such as is ordinarily used in letter press printing.

In using a machine of the type with which this invention is concerned, the operator first types a line in the usual manner, using a. standard space key or bar. Mechanism, which is dependent upon the difference between the length of the typed line and the length of a standard line, is provided to indicate to the operator which space key or keys should be -used when retyping the line to produce a justified or standard length line. This information is typed by the operator at the end of the line and subsequent lines are typed using the same procedure. To produce the justiiied copy, these typed lines are removed from the machine and retyped, using the space bars or keys indicated at the ends of the respective lines. The lines so retyped will all be of standard length. The retyped copy is then removed from the machine and utilized in any well known manner to form a master printing member or plate. For example, a planographic printing plate may be produced from the retyped copy by a photographic reproduction process. i

One of the objects of the present invention to provide a keyboard controlled printing maimproved work sheet feed mechanism, which mechanism will accurately advance the work lsheet a distance corresponding to the width of individual type following the impression of such individual type on the work sheet.

lA further object of the invention is to provide an improved inking ribbon feed mechanism for a keyboard` controlled printing machine', which feed mechanism will advance the ribbon varying amounts depending upon the width of individual impressions made on a work sheet, even though such impressions may vary in width from each other.

A further object is to provide a printing machine having a work sheet carriage and an indicating device which are advanced following the impression of each individual character, with an advancing mechanism arranged to prevent the overthrow or rebound of the carriage or indicator during or following the feeding operation.

Other objects and advantages of the invention will become more apparent from the following description, reference being had to the accompanying drawings in which there is illustrated a preferred embodiment of the invention. The essential characteristics of the invention will be summarized in the claims.

In the drawings, Fig. 1 is a plan view of a machine embodying my invention; Fig. 2 is an enlarged plan view of the left hand side of the machine, the cover and certain other parts being broken away to more clearly illustrate the internal construction; Fig. 3 is a plan view similar to Fig. 2 but illustrating the right hand side of the machine; Fig. 4 is a rear elevation of the machine; Fig. 5 is a side elevation looking at the right hand side of Figs. 1 and 3; Fig. 6 is a longitudinal vertical section, the plane of the section being indicated by the lines 6 6 on Figs. 1 and 2; Fig. 7 is a sectional detail of a shift key lock mechanism; Fig. 8 is a longitudinal vertical section as indicated by the lines 8 8 on Figs. 1, 2 and 4; Fig. 9 is a fragmentary vertical section through the type Wheels and associated mechanism, the plane of the section being indicated by the lines 9-9 on Figs. 1, 3 and 4; Fig. 10 is a fragmentary perspective view and illustrates a portion of the paper carriage together with portions of its supporting and actuating mechanisms; Fig. 11 is a transverse vertical section, as indicated 'by the oiset line H-II on Fig. 1; Fig. 12 is a sectional detail, the plane of which is indicated by the line I2-l2 on Fig. l1; Fig. 13 is a sectional detail on an enlarged scale,

chine having type of dilerent widths, with an illustrating a, ratchet mechanism for controlling 3 the progress of a paper carriage and Justification chart, the plane of the section being substantiaiLv indicated by the oifset line I3-I3 on Fig. 2; Fig. 14 is a sectional detail, similar to justing the travel of the paper carriage to there- V by control the printing pressure, the plane of the section being indicated by the lines 23--23 on i Fig. Fig. 24 is an enlargedsectional detail y through a portion of a mechanism for moving i the paper carriage to cause an impression to be made, the plane of the section being indicated by the lines 24-24 on Fig. 2; Fig. 25 is a diagrammatic illustration of a justification chart; Fig. 26 is an electrical diagram illustrating an electrical circuit for the machine.

Referring now to the drawings, and particularly to Fig. 1, it will be seen that my improved keyboard controlled printing machine comprises a frame I8 which supports a paper carriage I I. The

l paper carriage is progressed across the frame from right to left by a suitable feeding mechanism,

and is arranged to carry a platen I2 and a work sheetWso that the latter maybeline spaced. A i series of type wheels I4 are mounted on the frame lli, for rotation as a unit about a vertical axis. Each type wheel I4 carries an entire font of type; One wheel, for instance, may carry 6- point type, another 8point type, another 10-point type, etc. The wheels are arranged to be selectively positioned, relative to the platen I2, to enable use of the desired font of type. A keyboard I5 controls the rotation of the type wheels so as to bring the desired type of a selected font into printing position. The keyboard I5 also controis a mechanism which causes the paper carriage II to move bodily toward the type wheel I4 to cause an impression to be made of the 1 selected character or type.

Following the impression of a character on the work sheet, the paper carriage II is moved from right to left a distance which is determined by the width of the character last impressed. The total number of spaces between the words of a printed line, and the total distance the work sheet is advanced, controls the relative positions of a justifying scale I6 carried by a drum I1 and an indicator or pointer I8. The drum I1 and indicator I8 are mounted at the right hand side of the machine in front of the paper carriage.

To facilitate theVv operation of the mechanism, a copyholder, gener indicated at I9, is positioned between the keyboard I5 and the type wheels I4. This copyholder may comprise coacting rollers 28 Fig. 13 but illustrating certain of the parts in 5 and 2I between which a sheet to be copied is dilferent operating positions; Fig. 15 is a view placed.` It also may include a suitable copy supsimilar to Figs. 13 and 14 illustrating another port or guide 22. The arrangement is such that position of the parts, certain parts being omitted the operator may rotate the roll by means of to more clearly illustrate a ratchet release knobs 2,9 to bring the desired line of the copy into mechanism: Fig. 16 is a sectional detail illus- 10 position where itisreadily visible by the operator. trating a space key level mehaniSm. the Parts 01' In making the vinitial impression, the operator which are shown in the same position as in Fig. rst determines the length of the lines to be 5, the plane of the section being substantially printed and sets an indicator on an em scale indicated by the line I8-I6 on Fig. 3; Fig. 17 25 to indicate such length in ems. This scale is is a sectional detail similar to Fig. 16 illustrat` l5 automatically advanced as the line is typed, and ing certain of the parts indifferent positions, a signal. such as the ringing of a. bell, is given the plane of the section being substantially into the operator as will be hereinafter more fully dicated by the lines I'I-I1 on Fig. 3; Fig. 18 is a described. This signal is arranged to inform the view similar to Fig. 16 certain parts having been operator when a point a fixed distance from the i broken away and others shown in diiferent op- 20 end of the desired length of linehas been reached.v erating positions; Fig. 19 is a sectional detail of In the machine illustrated. thesignal is given a ribbon spool mechanism. the plane of the secfourems beforethe line limit is reached. Tlls tion being indicated by the line I8I9 on Fig. distance is generally suillcient for the impression 2; Fig. 20 is a sectional detail as indicated by the of ve to six letter characters without over-run- 1 lines 28-28 on Fig. 19; Figs. 2l and 22 are secg5 ning the end of the line -and therefore gives the tional details of portions of a mechanism conoperator opportunity to determine how much trolling the left hand margin of the work sheet, more may be typed without overrunning the line. the planes of the sections being indicated by the During the rst typing or printing of the copy, v correspondingly numbered lines on Fig. 4: Fig. the operator uses a space bar 28 ofthe keyboard 23 is a sectional detail of a mechanism for ad- I5 to cause the paper carriage to be advanced for i wordvspacing. Each time this space bar is actuated it causes the carriage to be advanced a predetermined distance. which, in the construction illustrated, is four units. Each time a character key 28 is actuated, the carriage II is advanced a number of units equivalent to the width of the type selected by the actuation of such key.

The keyboard I5 is also provided with a plurality of justifying space keys 24 each of which, when actuated, causes the carriage to be advanced a different number of units. In the form illustrated the keys are arranged to advance the carriage any desirednumber of units from five to eighteen inclusive.

The operator, during the initial typing, causes the typed line to approach the desired length as nearly as possible and then reads the scale I6.

At this time the indicator I8 is opposite indicia on the scale I6 which will indicate which space key or keys 24, if used instead of the space bar 23, in retyping for word spacing, will cause the typed line to be justiiied or extended to a length equal to the length of line desired for the finished copy. This designation is then typed at the end of the line.

Following the typing of the justification indicia at the end of a typed line-the operator depresses a release key 2'I. 'I'he depression of this key causes the paper carriage II to be returned to its right hand or starting position; advances the work sheet on the carriage II to position it to receive the next line to be printed, causes the em scale 26 to return to its zero or starting position, and causes the justifying scale I8 and indicator I8 to return to their starting positions. Thus the machine is made ready for the typing of the next line.

After all lines of a page have been typed or printed, the initial copy is removed from the carriage II and placed in the copyholder I9, and the sheet is then retyped. During this retyping the words are spaced by the keys 24 designated by the indicia at the end of the respective lines. The retyped page is thus justified and simulates a letter press impression.

The work sheet or paper carriage and the platen I2 are best illustrated in Figs. 1. 3, 4, 5, 6, 8 and 9. As there illustrated, the paper carriage comprises a pair of end plates and 3|, spaced apart by cross frame members, such as rods '32 vand bars 385 and 34, all of which are secured at their ends to the end plates. The frame member or bar 34 is positioned at the front of the carriage and is provided with a longitudinally extending, forwardly facing groove in which a plastic bar, which comprises the platen I2, is xedly seated.

Mounted above the platen I2 are a pair of coacting work sheet guide rollers 35, while a similar set of rollers 36 are mounted Ibelow the platen. A work sheet is passed between and gripped by the pairs of rollers and 36 and held tightly against the platen thereby. Suitable plate-like guide members 31 are provided to guide the work sheet and prevent undesired contact between it and various parts of the mechanism.

As indicated in the drawings, the work sheet may be fed upwardly for line spacing by rotating one of the rollers 35 which is provided with a knob 38 (Fig. l)

The work sheet may be advanced by a ratchet mechanism shown in Figs. 4 and 6 and 8. This ratchet mechanism is similar to that used on typewriters and comprises a ratchet wheel 40 secured to a shaft 4| journaled in the carriage end plate 3|. This ratchet wheel is advanced by a spring pressed pawl 42 (Fig. 8) pivotally mounted on a pawl carrier 43 which in turn is pivotally mounted on the shaft 4|.

The stroke of the pawl carrier may be limited by a pin 44. A spring 53 is interposed between the pin and the pawl carrier 43 to normally swing the carrier to its idle position shown in Fig. 8.

The effective stroke of the pawl is determined by a cam 45 which engages a pin 46 on the pawl and spaces the pawl from the ratchet wheel 40 so long as the pin rides on the cam. Thus the swinging of the carrier through a complete stroke may advance the ratchet one, two, three or four teeth as desired. The cam 45 is manually settable and is normally retained in its set position by a spring pressed plunger 41 (Fig. 6) which engages any one of a series of notches formed in the cam face. 'Ihe shaft 4| carrying the ratchet Wheel 40 may be geared to the shaft of one of the rollers 35 by gearing, generally indicated in Fig. 4 at 49.

The Work -sheet is positioned lengthwise of the carriage by end guides carried by supporting brackets 5| which in turn are mounted on a pair of rods 32 heretofore mentioned. At least the right hand guide 50 (Fig. l) is adjustable lengthwise of the carriage and may be secured in an adjusted position by a set screw 52 (Fig. 4). The other end guide 50 may be permanently or adjustably positioned as desired, but when once accurately positioned, need not be changed.

'I'he paper carriage is mounted for movement from right to left (Fig. 1), transversely across the machine. As shown in the drawings, particularly in Figs. l to 6, the frame |I| of the machine is provide with a pair of upstanding side brackets 55 which have their bases rigidly connected to the frame I0 and which are connected adjacent their upper ends by a comparatively rigid reinforcing bar 56. This bar 56 extends between the brackets in substantially the same horizontal plane as the platen I2. Also mounted in substantially the same horizontal plane as the reinforcing bai' 56 and the platen I2, are a pair of comparatively heavy rods 51 and 58. As indicated in Figs. 6, 9 and l0, the rod 5`| is mounted in the frame standards 55 for rotation about aiixed axis relative thereto. 'ine rod 58 is mounted or secured to guide blocks 56 which are slidably mounted in horizontally extending ways 60 formed in the brackets 55. Thus the rod 58 may be reciprocated toward and from the platen I2 in a substantially horizontal plane.

The paper carriage is mounted on the rods 51 and 58 for movement axially thereof. As indicated in Figs. 9 and 10 the carriage end plates 30 and 3| are slidable axially along the rod 58 which is Journaled in such plates. J ournaled on, and slidable axially of the rod 51, are a pair of blocks 6| which are mounted in ways 62 formed in respective carriage end members 30 and 3|. Thus the carriage may move or reciprocate horizontally relative to the bar 51 the axis of which is fixed relative to the frame brackets 55. This reciprocation of the carriage is used to effect the printing operation as will hereinafter be described more fully.

The type wheels I4 are best shown in Figs. .1, 9 and 11. In the present embodiment I have illustrated two type Wheels I4, each of which is mounted on a shaft 10 journaled in a frame bracket 1|. Each type Wheel carries on its periphery two annular sets or bands of type.' The type in the top band 12 of each type wheel I4 comprise lower case type, whereas those in the bottom band 13 of each wheel comprise upper case type. 'I'he upper wheel I4 may carry, for

instance, six point type and the lower wheel eight point type.

The type wheels are drivingly connected to the shaft 1U. A collar 16 is clamped and pinned to the shaft 10. as at 11 and 16, and carries a pin or rod 15 which engages openings 14 in the wheels I4. The shaft 10 is restrained from axial movement by the collar 16 and a collar 80 which embrace the frame bracket 1|. The type wheels are free for axial movement on both the shaft 10 and the pin 15. Thus either type wheel may be moved into printing position with the upper band of type thereof in the same horizontal plane as the platen I2.

When the machine is in operation the type Wheels are continuouslyA rotated, the rotation being stopped for the printing operation under the control of the keyboard I5 as will be hereinafter more fully described. The type wheels are normally rotated by a motor M (Fig. 30) which may be drivingly connected by a suitable V-shaped driving belt, not shown, with a drive pulley 82 best shown in Fig. 2. This pulley is rotatably mounted on a shaft 83 which extends transversely across the frame I0 being journaled in suitable bearings 84. A friction clutch 85 is interposed between the pulley 82 and the shaft 83. This clutch permits the rotation of the shaft to be stopped for the printing operation without stopping the rotation of the drive pulley 82. As such clutches are well known, no detailed description will be given. Secured to the shaft 83, intermediate its ends, is a gear 86 which meshes With a gear 81 drivingly secured to the type wheel shaft 10 as by a pin 88.

As heretofore mentioned, the type wheels I4 are mounted for axial movement on the shaft 10 to bring the upper case band 13 of type into printing position, that is, in horizontal alignment with the piaten I2. This movement of 7 the type wheels is accomplished by a shift mechanism which forms the subject of my copending` application. Serial No. 752.995. This mechanism is controlled by the keyboard l5. and particularly by a shift key 80, Figs. 1. 2. 6 and 7. As shown herein, the key SII is pivotally mounted as at 4| on a plate 82 which is carried by a lever I8. This lever is secured to a shaft I4 which is Journaled in frame members 45. A spring 58 normally retains the lever in an inactive posiltion, shown in Fig. '1. When the key 84 is depressed by the operator, the lower end 41 of the plate 82 contacts a leaf-type switch 88 energizing an electric circuit which 'causes the energization of a solenoid |88.

The solenoid |80 is best illustrated in Figs. 6 and 11, and is arranged to actuate a lever |8| pivoted at |82 to a frame bracket or post |88. When the solenoid is energized, the yoked end |44 of the lever coacts with a collar |45 pinned to a vertically extending rod |89 raising .the rod vertically. The rod |08 is mounted for axial movement inthe frame I8 and the frame bracket 1|. v

` Axial movement of the rod |88 is imparted to the type wheels I4 by a carriage |45. This carriage comprises an upper member l2 and a lower member 84 which are normally secured together as a unit by a set screw |81. The carriage |88 is positioned vertically on the shaft |89 by a manually operable latch ||8 pivoted as at to the upper carriage member 88 and arranged to selectively engage vertically spaced grooves ||2 or ||8 in the rod |88. When the latch is in the lower recess H8, as shown in Fig. 11. the upper type wheel i4 is in printing position and when the latch is in the groove ||2 the lower type wheel is in printing position. Rotary movement of the carriage |88 is prevented by a pin |I4 carried by the bracket 1| and having a sliding engagement with the carriage.

The raising of the rod I0! by the solenoid |88 raises the carriage |85 a distance sumcient to bring the upper case band of type 12 into alignment with the platen i2. The carriage is conaction of a spring |25 which is interposed between nected to the type wheels |4 by two pairs of rol. v

lers. One pair of rollers ||5 is carried by arms ||8 of the upper carriage member 83 and engages the upper surface of the top type Wheel |4. The other set of rollers ||1 is carried by arms |88 of the carriage member 84 andengages the bottom surface of the lower type wheel I4. The type wheels |4 are gripped between the two sets of rollers I5 and I1 and accurate alignment of the printing impressions is possible.

To ease the load on the solenoid Ill, I encircle the rod |88 with a spring` I I8. This spring is interposed between the frame i4 and a vcollar ||8 and serves to counterbalance a portion of the weight ofthe carriage |86 and the type wheels i4. The carriage and type wheels, however. have sumcient weight to insure their return under the influence of gravity to normal position. shown in Fig. 11. The lower position of the type wheels is limited by a; collar |28, which is shown in Fig. 11 as being pinned to the rod |89, while the uppermost position is limited by the collar |48 likewise pinned to the rod |88. These collars are arranged to engage respective faces of the frame bracket 1| heretofore described.

'I'he shift mechanism for moving the type wheels to their upper case positions may be latched to retain the wheels in such position. To vaccomplish this the operator depresses a key |22 (Fig. '1) instead of the key I0. This key is the lever 82 and the plate 92. Thus when the key |22 is depressed, a cam |28 will engage a locking notch |21 formed in the plate 92 and is retained in such position by the spring |25 until the key y88 is depressed. The depression of the key 88 swings the plate 82 in a clockwise direction. thus moving the notch |21 out of engagement with the cam |28, permitting the spring 88 Y to return the key levers to their normal position and opening the switch 88 and the circuit to the solenoid |48. The shift to upper case type may also be made by depressing a key |20 (Fig. 3) at the right hand side of the keyboard 5. This key |24 is connected with a lever |2| which is secured to the shaft I4 heretofore described.

The depresion of a letter key 28 stops the rotation of the type wheels I4 with the selected type in printing pomtion, while the depression of the space bar 2l or a space key 24 stops the type wheel I4 with a portion thereof either having no characters .or having quads in printing position. The mechanism for accomplishing this is best shown 'in Figs. 2. 3, 6 and 8. As shown. in Fig. 8, each key 28 or 24, as well as the space bar 23. is secured to a respective key lever |35. These levers are pivoted to a stationary shaft |88.

The key levers |25 are normally held in their uppermost position, against a stop bar |81 carried by the frame members or posts 85 heretofore mentioned, by individual springs |88. Each key lever |85 carries a pin |48 which is normally in latching engagement with a notch |4| formed in the end of respective levers |42. The levers |42 are pivoted to a stationary rod |48 extending across the frameV il. and are normallyretained in the position shown in Fig. 8 by individual springs |44 which are interposed between the respective levers |42 and a frame bar |45.

When the operator depresses a key 28, 24, or the bar 28, the tive key lever |85v is rocked clockwise against e action of its spring |88 to a position where its pin |40 is withdrawn from the notch |4| in the respective lever. |42, whereupon a spring |44 rocks'such lever |42 clockwise about its pivot shaft |48, causing a'lug |46 on the end of such lever to engage a notchA |41 in a disc |48. There are a plurality of such discs one for each lever |42. The discs |48 are keyed to the main drive shaft 88 so that their notches |41 are spaced circumferentially one from the other. Thus each disc will stop the rotation of the shaft 88 and accordingly the type wheel I4 in a different circumferential position. Accordingly, any selected character on the type wheel may be brought into printing `position relative to the platen i2.

The depression of a key 28, 24 or 28 also causes the carriage to move bodily toward the type wheels |4 to cause an impressionto be made on the work sheet W. As shown in Figs. 2, 3, 6 and 8, the rocking of a lever |42, as a result of the depression of a key. causes such lever to engage a bail |54 the ends of which are pivoted i". the bearing members 84 heretofore described. The movement of the bail |58 controls a single revolution clutch generally indicated at |52 in Figs. 2 and 6. The driving member |51 of this clutch is secured to a cam shaft |58 mounted on the frame I8 in bearings |54. The driven member |55 of the` clutch |52 is rotatably mounted on the shaft |52 and is drivinglyconnected by gearing |56 with the constantly rotating drive pulley 82 heretofore described. The single rotation clutch may be of any well known make, and hence is` not described herein in detail. Suffice it to say that the shaft |53 will rotate consequent upon the withdrawing of a latch |58 from a notch |59 in la clutch control member (Fig. 2) whereupon the shaft |53 will make one complete revolution following which the latch |58 will again engage the notch |59 and disengage the driving connection.

The latch |58 of the single revolution clutch |52 is in the form of a bell crank and is pivoted intermediate its ends as Iat |60 to a suitable frame bracket. The latch |58 carries a pin |6| engaged by a slot |62 in a lever |63 which, as indicated in Fig. 6, is secured to the bail |50. A spring |64, interposed between the latch |58 and the frame I0, serves to restore the latch |58, the bail |50 and their associated parts to their normal position as shown in Fig. 6. The action of the spring |64 is such that it may be readily overcome by the action of any of the springs |44 heretofore described.

The movement of the shaft |53 locks the type wheels I4 with the selected character in printing position prior to the making of an impression therefrom. As shown in Figs. 3, 5 and 9, a cam is secured to the shaft |53 and is arranged to coact with a roller |1| carried by one end of a link |12, the other end of which is pivotally connected at |13 with a lever |14. The lever |14 is secured to a shaft |15 journaled in suitable bearings |16 carried by the frame, and carries a lever |11 which actuates a bolt 18 slidably mounted in a guideway |19 carried by the frame l0'. As the cam |10 rotates, a spring |69 interconnected between the bolt and the guide- |19 brings a V-shaped nose |80 of thebolt into locking engagement with one of a plurality of notches |8| in a disc |82 which is secured as by a pin |83 to the lower end of the type wheel shaft 10. Following the making of the impression, hereinafter to be described, continued rotation of the cam |10 actuates the bolt |18 moving it against the action of the spring |69 and disengaging it from the disc |82.

Continued movement of the cam shaft |53, following the locking of the type wheels I4, causes the carriage together with the work sheet carried thereby, to move bodily against the type wheel |4, thus making an impression through a ribbon 220, hereinafter to be described, on the work sheet W of the selected type. As illustrated in Figs. 3 and 5, a cam discl |90 is secured to the right hand end of the shaft |53. This disc has a cam groove |9| arranged to be engaged by a roller |92 carried by a link |93. The link is in turn pivotally connected, as at |89, with a lever |94 which is secured as by a pin |95 to the shaft or rod 51 heretofore described as being one` of the rods which supports the paper carriage Il.

interconnected between the rod 51 and the other paper carriage supporting rod 58 are a plurality of toggles |96. Each toggle, Fig. 24, comprises a link |91 which is pinned as by a pin |98 to the rod 51, and a second link |99 pivotally connected to the first link by a pivot pin 200, and to the rod 58 as at 20|. As shown in Figs. 1, 2 and 3, there are three such toggles, one Vat each end of the rods 51 and 58 adjacent the frame brackets 55, and one in substantially the longitudinal center of such bars, the latter toggle being substantially in alignment with the axis of l0 the type wheels I4. The rod 61 being permanently secured to the frame members 55, a clockwise movement (Fig.P 24) of the rod 55 causes the toggles to straighten, forcing the rod 58 and accordingly the carriage toward the type wheels I4 to cause an impression to be made.

The arrangement is such that the impression may be made by a relatively sharp blow without danger of springing the various parts of the carriage or the frame. To accomplish this the force of the blow is transmitted to the frame brackets 55 through the reinforcing bar 56. As heretofore mentioned, one ofthe toggles, such as that illustrated in Fig. 3, is in alignment with the axis of the printing wheel |4. The movement of the rod 58 is transmitted directly to the frame bar 34 which, opposite the point of the impression, engages the enlarged head 203 of a pin 202 carried by the bar 58. The force of the blow is therefore transmitted through this pin and the central toggle 96 to the rod 51. Closely adjacent the central toggle |96 and journaled on the rod 51 is a collar 205. This collar is provided with a socket.206 into which a head 201 of a threaded stud 208 extends. ried by the reinforcing bar 56 and by reason of its threaded engagement therewith is adjustable so that the parts may be placed under tension to avoid the springing of the bars 51 and 58 under the impact of the printing blow.

The extent of movement of the rod 51 and accordingly that of the toggles |96 is adjustable to control the printing pre'ssure. As shown in Figs. 5 and 23, the pivot |89 between the link |93 and lthe lever |94, is provided with an eccentric portion 2|0 which engages the link. The position of this eccentric is controlled by a disc 2|| secured thereto as, for instance, by a stud 2|2. The disc 2|| may be manually placed in any one of a plurality of positions, thus changing the position of the eccentric 2|0. The disc 2|| is held in its adjusted position by a latch 2 3 pivoted as at 2|4 to the lever |94 and provided with an ear 2|5 which is normally urged into engagement with anyone of a plurality of recesses 2 I6 formed in the disc 2|| by a spring pressed plunger 2|1 carried by the lever |94.

As heretofore mentioned, the impression is made through an inked ribbon 220. 'Ihis ribbon Y to be used only once. As shown in Figs. 1, 2, 3

and 5, a supply of the ribbon 220 is wound about a Vribbon spool 22| rotatably mounted on a pin 222 carried by a frame member 223. The ribbon passes from the spool 22| to a suitable sheet metal guide 2|9 interposed between the platen l2 and the type wheels 4, and thence to the bite of a pair of rolls 224 and 225. The roll 225 is rotatably mounted on the frame bracket 1|, while the roll 224 is rotatably mounted on a lever 226 pivotally mounted a's at 221 to such bracket and normally urged into contact with the roller 225 by a spring 228 (Fig. 2). From/the rolls 224 and 225 the ribbon may extend across the cover 230 ofthe machine. The roller 225 is rotated to progress the ribbon as will be hereinafter more fully described.

The ribbon guide 2|9may be made of spring metal and may be similar to those ordinarily found in typewriters. It serves to space the ribbon from the normally rotating type wheels 'I'his stud is car-y

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