US2578286A - Keyboard operated printing machine - Google Patents

Description

Dec. 11, 1951 c. CHISHOLM 2,578,286

KEYBOARD OPERATED PRINTING MACHINE Filed Aug 25, 1949 11 Sheets-Sheet 1 z 3 4 7 a a n a. s

E V U I O P l I S s r a I x 4. a 1 I l l g 27 z x C v B N Z I II I/ INVENTOR. H 22 CLIFTON Oils/104M 64,23 flaw,

I7 TTORNEYJ Dec. 11, 1951 c. CHISHOLM 2,578,285

'. KEYBOARD OPERATED PRINTING MACHINE Filed Aug. 23, 1949 11 Sheets$haet 2 60 v m- I 4/ C1. IFroI/C IIISIIOLM HTTORNEYS Dec. 11', 1951 c. CHISHOLM KEYBOARD OPERATED PRINTING MACHINE i1 Sheets-Sheet 4 Filed Aug. 23, 1949 INVENTOR. CZ/FTON (HIS/YOU! Dec. 11, 1951 c. CHISHOLM KEYBOARD OPERATED PRINTING MACHINE 11 Sheets-Sheet 5 Filed Au 23, 1949 swam/kw C: ra/v C HIS/101M w @unhflm Dec. 11, 1951 c. CHISHOLM 2,578,286

KEYBOARD OPERATED PRINTING MACHINE Filed Au 23, 1949 11 Sheets-Sheet 6 INVEN TOR. C1. IFTON C/l/s/roz M BY 642, @442, vWflM Dec. 11,. 19.51 c. CHISHOLM 2,578,286

KEYBOARD OPERATED PRINTING MACHINE Filed Aug. 23, 1949 l1 Sheets-Sheet 7 fie-4 5 Dec. 11, 1951 c. CHISHOLM KEYBOARD OPERATED PRINTING MACHINE Filed Aug. 25, 1949 11 Sheets-Sheet 8 IN VEN TOR. ('1 IF m/v [ms/104M BY ala, 71 442, V 77/ Dec. 11, 1951 c. CHISHOLM KEYBOARD OPERATED PRINTING MACHINE 11 Sheets-Sheet 9 Filed Aug. 25, 1949 INVENTOR. W (Lino/ 0115mm H 176 encr Dec. 11, 1951 c. CHISHOLM 2,578,286

KEYBOARD OPERATED PRINTING MACHINE Filed Aug. 23, 1949 11 Sheets-Sheet 10 m5 r m/ 64 M0 A E 15 FIG. 16

IN VEN TOR. 62 /F 704 (Ir/M104 N @4224, QM, vi! a JTIUAWEX! Dec. 11, 1951 c. CHISHOLM 2,573,236

KEYBOARD OPERATED PRINTING MACHINE Filed Aug. 23, 1949 11 Shee'rLs-Sheet 11- v u v I N VEN TOR. CZ fro/v Ora/7'01. M

reproduced as in an ordinary typewriter.

Patented Dec. 11, 1951 KEYBOARD OPERATED PRINTING MACHINE Clifton Chisholm, Cleveland, Ohio, assignor of one-half to Henry C. Osborn, Cleveland, Ohio, and one-fourth to Marie F. Chisholm Application August 23, 1949, Serial N 0. 111,871

17 Claims.

This invention relates to an improved keyboard operated printing or typewriting machine. More specifically the invention relates to the provision of an improved power operated, keyboard controlled, printing machine having an improved work sheet carriage and supporting mechanism therefor, together with an improved mechanism for moving the carriage toward the printing member to obtain a clear, distinct and 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 the general objects of this invention.

My prior Patents Nos. 2,165,223, 2,165,224 and 2,165,225, issued July 11, 1939, and my copending application Serial No. 685,107, filed July 20, 1946. now Patent No. 2,506,701, dated May 9, 1950, disclose 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 However, a plurality of space 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. The letter keys control mechanism which causes impressions to be made from printing type of varying widths such as are 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 Mechanism, which is dependspace key or bar. out upon the difference between the length of the typed line and the length of a standard line indicates 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 justified copy, these typed lines are removed from the machine and retyped, using the space 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. ple, a planographic printing plate may be produced from the retyped copy by a photographic reproduction process.

One of the objects of the present invention is to provide an, improved keyboard controlled For exam- 1 printing mechanism with an improved work sheet carriage and support therefor which will facilitate the reproduction of an exceedingly clear and distinct copy.

Another object of this invention is to provide a keyboard controlled printing machine having type of difierent widths, with an improved mechanism for moving the Work sheet into and out of contact with selected type, and to so arrange such mechanism as to facilitate the control of the movement by the operator.

A further object of the invention is to provide a power operated, keyboard controlled printing machine, with an operating mechanism for selectively controlling the movement of the impression members toward each other.

A further object is to provide a power operated printing machine having a rotary type carrier with an improved mechanism for moving the work sheet carriage toward the type carrier when a letter key is depressed and which will render such mechanism inefiective when a space key is depressed without uncoupling the mechanism from the carriage or otherwise interfering with the normal operation of the machine.

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 apreferred 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 partial longitudinal vertical section taken through the paper carriage, type wheel, and their associated parts, the plane of the section being indicated by the lines 6-'o' on Figs. 1 and 2; Fig. '7 is a sectiona1 detail illustrating the key lever mechanism, certain parts being omitted to clarify the operation of the lever, the plane of the section being indicated by the lines 'l-'l on Fig. 3; Fig. 8 is a sectional detail similar to Fig. 7, but illustrating the lever in a different operating position; Fig. 9 is a fragmentary vertical section illustrating a single revolution clutch and its operating mechanism, the plane of the section being indicated 7 by the line 9--9 on Fig. 2; Fig. 10 isifa sectional detail, on an enlarged scale, illustrating a ratchet mechanism for controlling the progress of a paper carriage, the plane of the section being substantially indicated by the offset line ill-ii on Fig. 2; Fig. 11 is a sectional detail illustrating a portion of the linkage for actuating the paper carriage, the Plane of the section being indicated by the line i ll on Fig. 3; Fig. 12 is a sectional detail similar to Fig. 11, but illustrating the parts in a difierent position; Fig. 13 is a sectional detail, the plane of the section being indicated by the line iii-i3 on Fig. 12; Fig. 14 is a fragmentary elevation of another portion of the linkage shown in Fig. ll, looking at the right hand side of Fig. 2; Figs. 15 and 16 are sectional details the planes of the section being indicated b the corre spondingly numbered lines on Figs. 14 and 15; Fig. 17 is a sectional detail, certain parts being broken away, of a mechanism for adjusting the paper carriage to control the left hand margin of the imprint, the plane of the section being substantially the same as that of Fig. 6; Figs. 18, 19 and 20 are sectional details as indicated by the correspondingly numbered lines on Fig. 17; Fig. 21 is a sectional detail of a portion of the carriage supporting and guiding mechanism, the plane of the section being indicated by the line 21-2! on Fig. 6; and Fig. 22 is an electrical diagram illustrating an electrical circuit for the machine.

In the drawings, and particularly in Fig. l, the keyboard operated printing machine, in connection with which the present invention has been illustrated, comprises a frame [6 which supports the improved paper or work sheet carriage ii. This carriage is progressed across the frame from rig t to left by a suitable variable feed mechanism, such as that of my copending application Serial No. 751,303, filed May 29, 1947, now Patent No. 2,505,702, dated May 9, 1950. The improved carriage, hereinafter to be described in detail, carries a platen mechanism, generally indicated at it, and a work sheet so that the latter may be line spaced. A wheel M is mounted on the frame ill, for rotation as a unit about a vertical axis. This type wheel may carry four annular bands of type each comprising an entire font. The bands are arranged in pairs, the upper band of each pair carrying lower case type and the lower band upper case type. One pair of type bands may be 6-po nt type and the other 8-point type. The type wheel is arranged to be selectively positioned, relative to the platen mechanism E2, to enable use of the desired font of type, as for instance, by the mechanism of my copending application Serial No. 752,995, filed June 6, 1947, now Patent No. 2,506,704, dated May 9, 1959. A keyboard it controls the rotation of the type wheel so as to bring the desired type of a selected font into printing position. The keyboard 55 also controls the mechanism of the present invention which causes the paper carriage l I to move bodily toward the type wheel hi to cause an impression to be made of the selected character or type.

Following the impression of a character on the work sheet, the paper carriage H 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 carried by a drum I? and an indicator or pointer 18. The drum I? and indicator is are mounted at the'right hand side of the machine in front of the paper carriage and are described in detail in my copending application Serial No. 585,107 heretofore referred to.

To facilitate the operation of the mechanism, a copyholder, generall indicated at [9, is positioned between the keyboard 15 and the type wheel M. This copyholder may comprise coacting rollers one of which is shown in Fig. l at 23, and between which a sheet to be copied is placed. It also may include a suitable copy support or guide 25. The arrangement is such that the operator rotate the roll 23 by means of knobs to bring the desired line of the copy into position where it is readily visible by the operator.

In making the initial impression, the operator uses a space bar 23 of the keyboard :5 to cause the paper carriage to be advanced for word spacing. 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 24 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 Hi is also provided with a plurality of justifying space keys 25 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 desired number 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. At this time the indicator it is opposite indicia, on the justifying scale carried by the drum ll, which will indicate which spaced key or keys 25, if used instead of the space bar 23, in retyping for word spacing, will cause the typed line to be justified or extended to a line 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?. The depression of this ke is described in detail in my copending application Serial No. 635,107. The 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 H to position it to receive thenext line to be printed, and causes the justifying scale drum i? and indicator 5% 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 I l and placed in the copyholder l9, and the sheet is then retyped. During this retyping the words are spaced by the keys 25 designated by the indicia at the end of the respective lines. The retyped page is thus justified and simulates a letter press impression.

The improved work sheet or paper carriage H and the platen mechanism l2 are best illustrated in Figs. 1 to G and 17 to 21 both inclusive. As there illustrated, the paper carriage ii comprises a pair of end plates 36 and 3 spaced apart by cross frame members, such as'bars 32 to 37 inclusive and rods 33, all of which are secured at their ends to the end plates. The frame member or bar 3? comprises part or". the platen mechanism 12. This bar is positioned at the front of the carriage and is provided with a longitudinally ex-- standing frame brackets 55.

tend-ing, forwardly facing groove in which a plastic bar 39 i fixedly seated. This bar 39 coacts with the type wheel M to make the impression on.

the work sheet.

' The platen bar 31 extends horizontally in front of the carriage l l and is backed up by a platen roll 40. This roll extends horizontally across the carriage directly to the rear of the platen bar 31 with ts axis in the same horizontal plane as the bar. The roll 4!] comprises a metal cylinder which is secured to a shaft 4|, as by pins, one of which is shown at 42 in Fig. 6. The shaft 4| extends .through and is journalled in the end plates and 31 of the carriage II, and the ends thereof are provided with knobs 43 by means of which the shaft may be manually rotated. The periphcry of the platen roll snugly engages the rear face of the platen bar 31, which has an arcuate surface 44 complementary to the periphery of the roll. The roll 4t reenforces the platen'bar 3.! throughout its entire length.

Pivotally mounted on a carriage frame rod 45,

above the platen roll 46, are a pair of brackets 48, each of which carries a rubber coated roller Similar sets of brackets 48, carrying rollers 43, are mounted on a carriage frame rod which extends below the platen roll. The brackets 46 and 49 are spring pressed to bring their respective rollers 41 and 49 into engagement with the platen roll 40. A work sheet is passed downward, at the rear of the platen roll 40, between the surface of such roll and a guide plate 59, and extends forward between the rollers 49 and the roll 45, thence upward around the platen bars 3'! and 39, and rearward between the platen roll '40 and the rollers 41. The guide plate 58 is provided with the usual recesses to permit the 'rolls 49 to engage the sheet.

Mechanism is provided to feed the work sheet upwardly around the platen bars 31 and 39 for line spacing. This is accomplished by rotating the roller 40 either by its knobs 43 or by a suitable ratchet mechanism generally indicated at 5|, for instance that illustrated and described in my copending application Serial No. 685,107, heretofore referred to. However, any of the well known platen roll advancing mechanisms commonly used on typewriters may be provided for this purpose. Accordingly, a detailed descrip 'tion of such mechanism becomes unnecessary.

The paper carriage H is slidably mounted for movement from right to left (Fig. 1), transversely across "the machine between a pair of up- As shown in the drawings, particularly in Figs. 1 to 6, the frame it of the machine is provided with a pair of upstanding side brackets which have their bases rigidly connected to the frame If) and which are connected adjacent their upper ends by a comparatively rigid reenforcing bar 56. This bar 56 extends between the brackets in substantially the same horizontal plane as the platen mechanism l2. Also mounted in substantially the same horizontal plane as the reenforcing bar 55 and the platen mechanism [2, are a pair of comparativelt heavy rods 51 and 58. The rod '5? is mounted in the frame standards 55 for rotation about a fixed axis relative thereto but is constrained against axial movement. Each end of the rod 58 is provided with a roller 59 which is slidably mounted in horizontally extending ways 60 formed in the brackets 55. Thus the rod SB-may be reciprocated toward and from the platen! in a substantially horizontal plane.

The paper carriage is slidably mounted on the rod 58 for movement axially thereof. Thecarriage end plates 30 and 3| are slidable axially along the rod 58 which is journalled in such plates. Thus the carriage may move to and from the type wheel l4 as a unit with the bar 58. This reciprocation of the carriage is used to effect the printing operation as will hereinafter be described more fully.

The paper carriage is guided in its axial movement along the rod 58 by a pair of vertically spaced rollers 65 which coact with opposite faces of the carriage frame bar 36. These rollers are best illustrated in Figs. 6 and 21. As there shown, a post-like structure 66 is mountedon the frame IE) and extends upward between the carriage end plates to the rear of the type wheel 14-. The rollers 65 are journalled on pins 61 carried by the post 66 and extend forwardly therefrom coacting with the upper and lower surfaces of the carriage frame bar 36. The rollers are of sufiicient length to permit movement of the carriage toward and from the type wheel i4 without disengaging the bar 36 which is of a width sufficient to insure accurate positioning of the carriage [5.

The type wheel [4 is shown in Figs. 1, 2, 3 and 6 as'being drivingly mounted on a vertically extending shaft 10 journalled in a frame bracket H. As heretofore mentioned, each type wheel carries on its periphery two pairs of annular sets orbands of type.' The type in the top band of each type pair 14 comprise lower case type, whereas those in the bottom band of each pair comprise upper case type. The upper pair of bands may carry, for instance, six point type and the lower pair of bands eight point type. I When the machine is in operation the type wheels are continuously 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 normits the rotation of the shaft to be stopped for the printing operation without stopping the rotation of the drive pulley 12. As such clutches are well known, no detailed description will be given. Secured to the shaft 13, intermediate its ends, is a gear 16 which meshes with a spiral gear Tl drivingly securedto the type wheel shaft 10 as by a pin I8.

The type wheels l4 are mounted for axial movement on the shaft 10 to bring the upper case band of type of the selected pair into printing position, that is, in horizontal alignment with the platen l2. This movement of the type wheels is controlled from the keyboard l5, and particularly by a shift key (Figs. 1 and 2). A suitable mechanism for this purpose is shown and described in my copending application Serial No, 752,995, filed June 6, 1947. Briefly, the depression of the key actuates an electric switch 8| (Fig. 22) energizing an electric circuit which causes the energization of a solenoid 82 (Figs. 1, 2 and 4). This solenoid actuates a lever 83 which raises the type wheel l4 without disturbing its driving connection with its supporting shaft 10. The weight of the wheel, together with a suitablespring (not shown), returns the type wheel to its normal position. Mechanism, which forms no part of the present invention but which is shown and described in my copending application 752,995, heretofore referred to, enables the selection of either pair of type bands as desired.

The depression of a letter key 24 stops the rotation of the type wheel I4 with the selected type in printing position, while the depression of the space bar 23 or a space key 25 stops the type wheel I4 with a portion intermediate two characters in printing position. The mechanism for accomplishing this is best shown in Figs. 2, 3, 7 and 8. Assh-own, in Fig. '7, each key 24 or 25, as well as the space bar 23, is secured to a respective key lever 85. These levers are pivoted to a stationary shaft 05.

The key levers 85 are normally held in their uppormost position, against a stop bar 81 carried by the frame members or posts 84 by individual springs 88. Each key lever 85 carries a pin 90 which is normally in latching engagement with a notch 9I formed in the end of respective levers 92. The levers 92 are pivoted to a stationary rod 93 extending across the frame I0, and are normally retained in the position shown in Fig. 'I by individual springs 94 which are interposed between the respective levers 92 and a frame bar 95.

When the operator depresses a key 24 or 25,

or the bar 23, the respective key lever 85 is rocked clockwise against the action of its spring 88 to a position where its pin 90 is withdrawn from the notch 9! in the respective lever 92. Thereupon a spring 94 rocks such lever 92 clockwise about its pivot shaft 93, causing a lug 95 on the end of such lever to engage a notch 91 in a disc 98. There are a plurality of such discs one for each lever 92. The discs 98 are keyed to the main drive shaft 13 so that their notches 91 are spaced circumferentially one from the other. Thus each disc will stop the rotation of the shaft I3, 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 mechanism I2;

The depression of a key 23, 24 or 25 also causes the carriage II to move bodily toward the type wheels I4 to cause an impression to be made on a work sheet. As shown in Fig. 8, the rocking of a lever 92, as a result of the depression of a key, causes such lever to engage a bail I the ends of which are pivoted in the bearing members I4 heretofore described. The movement of the bail I00 controls a single revolution clutch generally indicated at I02 in Figs. 2 and 9. The'driven member I03 of this clutch is secured to a cam shaft I04 mounted on the frame I0 in bearings I05. The driving member I06 of the clutch I02 is rotatably mounted on the shaft I04 and is drivingly connected by gearing with the constantly rotating drive pulley I2 heretofore described. The single rotation clutch may be of any well-known make, and hence is not described herein in detail. Suflice it to say that the shaft I04 will rotate consequent upon the withdrawing of a latch I08 from a notch I09 in a clutch control member IIO (Fig. 2) whereupon the shaft I04 will make one complete revolution following which the latch I08 will again engage the-notch I09 and disengage the driving connection.

The'latch I08 .ofthe single revolution clutch 4 02 is the form of. a bell crank andis pivoted intermediate its ends as at I I I to a suitable frame bracket. The latch I08 carries a pin II2 engaged by a slot I I3 in a lever I I4 which, as indicated in Fig. 9, is secured to the bail I00. A spring I I5. interposed between the latch I08 and the frame I0, serves to restore the latch I08, the bail I00 and their associated parts to their normal position as shown in Fig. 9. The action of the spring H5 is such that it may be readily overcome by the action of any of the springs 94 heretofore described.

The movement of the shaft I04 locks the type wheel I4 with the selected character in printing position prior to the making of an impression therefrom. As shown in Fig. 6, a cam H6 is secured to the shaft I04 and is arranged to coact with a roller I I7 carried by one end of a link I I8, the other end of which is pivotally connected at II9 with a lever I20. The lever I is secured to a rod IZI journalled in suitable bearings I22 carried by the frame, and carries a lever I23 which actuates a bolt I24 slidably mounted in a guideway I25 carried by the frame I0. As the cam IIG rotates, a spring I25 interconnected between the bolt and the guideway I25 brings a V-shaped nose I21 of the bolt into locking engagement with one of a plurality of notches I28 in a disc I29 which is secured as by a pin I30 to the lower end of the type wheel shaft I0. Following the making of the impression, hereinafter to be described, continued rotation of the cam II6 actuates the bolt I24 moving it against the action of the spring I26 and disengaging it from the disc I29.

Continued movement of the cam shaft I04, following the locking of the type wheel [4, causes the carriage II, together with the work sheet carried thereby, to move bodily against the type wheel I4, thus making an impression on the work sheet through a ribbon I carried by a ribbon spool I35 and drawn past the printing position by a pair of coacting rolls I37 and I38. A suitable mechanism for this purpose is described in detail in my copending application Serial No. 685,107 heretofore mentioned.

The carriage I I is moved toward the type wheel I4 consequent upon the rotation of a cam disc I40. This cam disc is secured to the right hand end of the shaft I04 and is provided with a cam groove I4I arranged to be engaged by a roller I42 carried by a composite link, generally indicated in Figs. 2 and 5 at I43. This link is connected, as at I39, with a lever I44 which is secured to the shaft or rod 5'! heretofore described as extending between the upstanding frame brackets to the rear of the paper carriage II.

Interconnected between the rod 51 and the other paper carriage supporting rod 58 are a plurality of toggles I46. Each toggle, Fig. 6, comprises an arm I4'I which is pinned as by a pin I49 to the rod 51, and a second arm I49 pivotally connected to the first link by a pivot pin I50, and to the rod 53 as by a pin I5I. As shown in Figs. 1, 2 and 3, there are three such toggles, one at each end of the rods 51 and 58 adjacent the frame brackets 55, and one in substantially the longitudinal center of such rods, the latter toggle being substantially in alignment with the axis of the type wheel I4. The axis of the rod 5! being permanently fixed relative to the frame members 55, a clockwise movement (Fig. 6) of the rod 51 causesthe toggles to straighten, forcing the rod 53' and accordingly the carriage II toward the type wheel I4 to cause an impression to be made. r The arrangement issuch that theimpressionmay collar I54 to the bar 56.

9 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 framebrackets 55 through the reenforcing bar 56. As heretofore mentioned, one of the toggles is in alignment with the axis of the printing wheel I4. The frame, bar 56, opposite the point of the impression, is provided with a pin I52 having an enlargedhead I53 which engages a collar I54 on the bar 51.

The force of the blow is therefore transmitted through this pin and the central toggle and the If desired the rod 58 may be provided with a roller I55 (Fig. 2) which engages the platen roller 40, thus increasing the rigidity of the structure.

. A feature of the present invention is the provision of an improved mechanism for controlling the forward limit of travel of the paper carriage and platen mechanism, thus controlling the printing pressure. In the present invention this is accomplished by lengthening or decreasing the length of the composite link I43. This controls the forward limit of travel of the platen mechanism. I2 without altering its printing stroke. The mechanism for accomplishing this is best shown in Figs. 1,3, 14, and 16. As there shown, the roller I42 of the composite link I43 is mounted on. an eccentric end I56 of a pin I51 which is journalled in a sleeve I59 secured to the link. The pin is retained in the sleeve by a setscrew I59 carried by the sleeve and engaging an annular recess formed in the pin.

The position of the eccentric portion I56 of the pin I51 is determined by the position of an arm I60, secured to the pin, relative to a disc IOI which is secured to the composite link. As shown in Figs. 14 and 15, the disc I6I is secured to the outer end of the sleeve and the arm I60 is secured to the squared outer end I52 of the pin by a set screw I63 so as to overlie the disc.. The disc I5I is provided with a series of spaced openings I64 which may be selectively engaged by a plunger I65 slidably mounted in a sleeve I66 carried by the arm I60 and normally retained inengagernent with one of the openings I54 by a spring I61. A suitable knob I68 on the outer end of. the plunger I65 permits withdrawal thereof and repositioning of the relative positions between the arm I60 and its indexing disc I6I as desired by the operator.

Another feature of the present invention is the provision of mechanism for controlling the movement of the platen mechanism to determine whether or not an impression is to be effected during predetermined cycles of operation of the machine. Such a mechanism is advantageous in that it permits the machine to skip the actual impression operation whenever a space key is struck without requiring the use of quads or blank spaces in the type wheel I4 and without otherwise interfering with the normal operation of the 'machine. By eliminating theneed for quad's or blank spaces on the type wheel I4, the wheel :inay-be provided with a maximum number of latter spaces while maintaining a minimum diameter, thus facilitating the use of a minimum size wheel, and if desired eliminating the stopping of the rotation of the printing wheel during spacing operations. However, I prefer to stop such rotation and bring the printing wheel to rest with the. meeting line between two adjacent type or characters directly opposite printing position during spacing operations.

The control. of the movement-.ofthe platen 10.. mechanism is accomplished by automatically decreasing the effective length of the composite link I43 which, as heretofore described, is part of the mechanism which moves the carriage II toward the type wheel I4 to eifect the printing operation.

The key levers 92 of the space keys 25 and the lever 95 of the space bar 29 are each provided with an enlarged opening I10. These openings are normallyaligned with each other and are arranged to receive a rod I1I which is secured to a lever I12 pivoted to the frame I0 as at I13 (Fig. 5).

When any one of the keys 23 or 25 is struck, the spring 04 in rockin that respective lever 92 counterclockwise (Fig. 7) to position the type wheel I4 and release the clutch I02 to cause the shaft I 04 to make one revolution, also causes such lever 92 to engage the rod HI and rock the lever I12 counterclockwise, around its pivot I13, against the action of a spring I14. Such levers 92 and I12 remain in their swung position till the latter part of the cycle of operation. This results from the release of the latching connection 90, 9| between such lever 92 and its associated key lever 85 which frees the lever 92.

The counterclockwise movement of the lever I12 energizes a solenoid I15. As the lever I12 swings counterclockwise it closes the contacts of a leaf spring switch I19 which, as shown in Figs. 7 and 8, is mountedon a stationary frame member indicated at I11. The closing of these C011. tacts energizes the solenoid I 15 and causes its armature I10 to be drawn upward (Fig. '5). The armature I18 is pivotally connected as at I19 with a plate I which is pivoted as at I8I to the frame I0. Thus when the solenoid is energized the plate I80 will be rocked counterclockwise (Fig. 5) about its pivot I8I against the action of a spring I82 which is interconnected between the plate and the frame I0. The movement of this plate is limited by a pin and slot connection I83 with the frame. counterclockwise movement of the plate I 80 swings its hooked upper end I84 into the path of a pin I85 carried by-the composite link I43. I

When the composite link I43 is moved by the cam I40, to rock the shaft 51 counterclockwise as viewed in Fig. 5 causing the paper carriage II to move toward the type wheel to make an impression on the work sheet, the engagement of the pin I85 by the hook I84 of the plate I80 shortens the composite lever. This decreases the distance the paper carriage travels to such an extent that no imprint will-be made on the work sheet.

The composite link I43 comprises two aligned bar sections I and I9I and is best illustrated in Figs. 5, 11, 12 and 13. The outer end of the section I00 carries the cam engaging roller I42 and the outer end of the section I9I is pivotally connected to the arm I44 which rocks the rod 51. The inner end of the, section I90 is secured, as by rivets I92, to a guide I 93 in which the inner end of the section I9I is slidably mounted.

A cam plate I 94 is pivotally mounted on a stud I95 secured to the section I90. This cam. plate is provided with a cam groove I96 which'cooperates witha roller I91 mounted on a pin I98 carried by the section I 9|. A spring I99 is connected between a pin 200, carried by the guide I93, and the pin I85, which is carried by the cam plate I94. This spring acts to retain the cam plate in its clockwise position (Fig. 11). In this position the sections I90 and I9I are separated their maximum distance and the composite link 11 has its maximum length. An adjustable eccentric pin 282 is secured to the guide I93 and serves as a stop for the cam plate I95, thus permitting a fine adjustment of the maximum length of the composite link I43.

When, during the movement of the link M3 toward the left in Fig. 11, the plate I83 swings upward into the path of the pin IE5, the cam plate its is rocked about its pivot I93 from the position shown in Fig. 11, to the position shown in Fig. 12. Such movement of the cam plate draws the link section I95 toward the link section I90, thereby shortening the overall length of the composite link. As this occurs during the movement of the link the travel of the arm I i-l is decreased. This decreases the travel of the carriage I I toward the type wheel is by a distance sufficient to prevent the making of an impression on a work sheet.

On the return movement of the link I43, the pin I85 disengages the plate 133 and the springs I99 and I82 return the parts to their normal operating positions.

The rotation of the cam shaft I34 automatically restores the key levers and their associated mechanisms to their normal positions. The latching engagement between the key lever 85 and its respective lever 92 is restored. As shown in Fig. 8, the central portion of the shaft I84 is in the form of an elongated cam 205 which, after the impression has been made, engages the lever 92 which was swung clockwise by its spring 34 following the depression of the corresponding key, moving the lever against the action of its spring 94 to the position shown in Fig. '7. lever 32 returns to its normal position a cam portion 286 on the right hand end of the lever engages the pin. 93 of its respective key lever and rocks such lever a distance sufiicient to perma its spring 88 to cause the pin to reengage the notch 9! in the lever 92, thus latching the levers together.

The rotation of the shaft I34 also progresses the paper carriage I I and the inking ribbon I35, the movement of both being under control of a ratchet mechanism shown in Figs. 2, 6 and 10. Such mechanism forms the subject of my copending application Serial No. 751,303, filed May 29. 1 947. Briefly, this ratchet mechanism causes the paper carriage 11, as well as the ribbon 135, to be advanced a distance commensurate with the width of the type from which the last impression :was made.

The distance the paper carriage I I is advanced is under direct control of a pair of notched discs .216 (Fig. 6). These discs 213 are drivingly secured to a common hub ZII which is mounted on. the lower end of the type wheel shaft I0. Each of these discs 2H] contains a number of eripherally spaced notches 253, the position and depth of which vary according to the position and width of corresponding type in the type wheel I v4. As the shaft 18 is rotated to bring a specific type character into printing position, the notch 2I3 corresponding to such character is brought into alignment with a spur 2I5 carried by a plrmger 2I6 (Fig. 10) mounted for reciprocation in frame brackets 2I'I. This plunger is normally held in a retracted position against an adjustable :stop 2M by a spring 2l8 interconnected between a pin 2l9 carried by the plunger and a pin 223 .carried by a relatively stationary member.

The rotation of the shaft I during the making of the impression releases a mechanism which causes the plunger 2H5 to be urged forward yield- As the r an inch from the edge of the sheet.

ingly until the end 2I5 thereof seats in the notch 2E3 of the disc 2H) which at that time is aligned therewith. As shown in Fig. 10, a cam 230 is pinned to the shaft I34. While the impression is being made the shaft I24 moves a low portion of this cam into contact with a roller 23l carried by a link 232, whereupon a spring 233 draws the link to the left (Fig. 10)

As the link 232 moves to the left, under impulse of the spring 233, the end of a slot 229 in the link 232 engages a pin 23? carried by a pawl carrier 238 which is pivotally mounted on a shaft 239 journalled in suitable bearings 220 (Figs, 2 and 3) carried by the frame It and swings the carrier in a clockwise direction. The pawl carrier 238 is connected by an elongated segment 2 (Figs. 2 and 10), with a segmental gear 243 journalled on the shaft 239, and the teeth of which engage a rack-like formation 24 3 on the left hand end of the plunger 2I6. It is thus obvious that the depth of the notch controls the amount of movement of the plunger 2I6 and the pawl carrier 238.

The pawl carrier 238 advances a ratchet wheel 22I which is drivingly secured to the shaft 239. A pawl 222 carried by a lever 223 pivotally mounted on the pawl carrier 238 advances the ratchet wheel 225, a distance commensurate with the depth of the notch 2I3 which is engaged by the plunger 2I6, consequent upon the completion of a cycle of rotation of the cam shaft I0 1. Suitable detent pawls 248 and 249 (Fig. 10) prevent both overthrown and return movements of the ratchet wheel. Such pawls and their operating mechanisms are described in detail in my copcnding application Serial No. 751,303, filed May 29, 1947.

The arcuate movement of the shaft 239 is transmitted to the carriage I I to advance it a distance equivalent to the width of the type character last impressed. As shown in Figs. 2 and 10, a beveled gear 224 is drivingly secured to the shaft 239 and meshes with a beveled gear 225 drivingly secured to a shaft 226. This shaft is journalled in bearings 221 carried by the frame I I]. Drivingly secured to this shaft, at the rear of the machine, is a pinion 235 (Fig. 4) which meshes with a rack 23B carried by the paper carriage II. Thus, the movement of the shaft 239 advances or progresses the paper carriage toward the right (Fig. 4), against the action of a coil spring 245 mounted in a housing 246 carried by the frame II] and connected with the rack 236 as at 241.

The release key 21, as heretofore mentioned. returns the carriage II to its starting position. As shown in Fig. 10, the release key 21 is mounted on a key lever 259 fixed to a shaft 25I journalled in the frame III. This shaft carries a bar 252 which normally lies in the position shown in Fig. 10. When, however, the key 21 is depressed, the bar 252 moves counterclockwise and engages pins 253 carried by the ratchet pawls 222, 248 and 249 heretofore described, moving these pawls away from the ratchet wheel 22I, whereupon the spring 245 returns the carriage to its original position (to the left in Fig. 4,, or the right in Figs. 1, 2 and 3).. This movement of the carriage through the gearing 235, and the shafts 226 and 239, restores the ratchet wheel 22I to its starting position.

The paper carriage is so arranged that normally the printing of a line is commenced a half However, it is sometimes desirable to commence the printing .line .a greater distance from the edge of the margin, the rack 236 is adjustably mounted on the carriage H.

As indicated in Figs. 4, 6 and 17, the rack is mounted for longitudinal movement between a pair of downwardly extending ears 260 formed in each carriage end plate 30 and 3|. The rearmost ear of each pair has a tongue which engages a longitudinally extending groove 26I in the rack bar 236 and maintains the vertical relationship between the rack and carriage.

The rack bar is normally latched to the carriage. As shown in Figs. 6 and 17, a latch bar 262 is pivoted on a pin 263 carried by a bracket 264 which is secured to the rack bar 236 by studs 265. A spring 266, interposed between the latch bar and the bracket, normally maintains teeth 26'! formed on the latch bar in engagement with the teeth of a rack-like formation 268 on the underside of the carriage frame bar 34, thereby latching the rack 236 to the carriage.

An indicator is provided to visibly indicate'the position of the rack bar 236 relative to the carriage II. The latch bracket 236 is provided with an upstanding pin 210 having an index mark 2' on its upper end. This index mark coacts with a scale 212 (Fig. 18) inscribed on the upper surface of the carriage frame bar 33.

When it is desired to adjust the left-hand margin of the imprint on the work sheet, to say three inches, the operator depresses a key 215 which releases the latch and locks the rack bar 236 in a definite position relative to the frame ID. Following the depression of the key the operator moves the carriage until the index 2' is opposite the three inch mark on the scale 212. The key is then released whereupon the latch returns to its normal position and latches the rack bar 236 to the carriage.

The key 215 (Figs. 1, 5 and 17) is mounted on the upper end of a rod 216 which is slidably mounted in the reenforcing bar 36 at the rear of the machine. A spring 211 normally retains the key 215 in its uppermost position. When the key 21-5 is depressed, the lower end of the rod 216 engages the outer end of the latch bar 262 rocking it from the position shown in Fig. 6 to the position shown in Fig. 17. This movement of the latch bar disengages the teeth 261 thereof from the rack 268 of the bar 34, thereby releasing the rack 236 to permit relative movement between the rack 236 and carriage.

Prior to the completion of the release of the rack 236 by the latch bar 262, this bar engages a slot 218 formed in the upper end of a post 219 which is secured to the frame ID as by studs 280. This latches the rack 236 to the frame H] and facilitates the movement of the carriage by the operator.

I claim:

1. In a printing machine of the keyboard type, a frame, a type wheel rotatably mounted on said frame, a plurality of keys, a plurality of type extending about the periphery of said wheel, key controlled means to bring a selected type into printing position, a pair of parallel rods carried by said frame, one of said rods having its axis fixed relative 'to said frame, the other of said rods having its axis movable relative to the frame,

a. carriage slidably mounted on said last named rod, means on said carriage to support work, an elongated platen bar fixed to said carriage and extending parallel t and in the same plane as said rods, toggle means interconnecting said rods to move the axis of the last named rod and the 14 carriage toward and from the type wheel to cause an impression to be made on the work, key controlled means to rock the first named rod to actuate said toggle means, a guide bar secured to said'carriage and extending parallel with said' rods but spaced therefrom, and a pairof rollers mounted on said frame and embracing saidbar to prevent rocking of the carriage about its supporting rod. i

2. In a printing machine of the keyboard type. a frame, two groups of keys thereon, a carrier having a plurality of type faces thereon, means:

; movement whenever the keys of such group are actuated.

3. In a printing machine of the keyboard-type, a frame, a'plurality of keys thereon, a carrier having a plurality of type faces thereommeans including certain of said keys to bring a selected type face into printing position, a work carrier,"

one of said carriers being mounted for movement to and from the other carrier to efifect'anirm pression on work, mechanism to move said mov able carrier including an adjustable member to vary the amount of such movement, means under control of said keys to actuate said mechanism, and means under control of certain of said keys' and coacting with said adjustable member to vary the amount of said movement.

4. In a printing machine of the keyboard type, a frame, a plurality of keys thereon, a" carrier having a plurality of type faces thereon side by side, means including one group of said keys to bring a selected type face into printing position,

means including another group of keys to posi-' tion said carrier with a point intermediate two type faces in printing position, a work carrier, one of said carriers being mounted for movement to andfrom the other carrier to effect an impresnamed means to control the amount of said movement, and means under control of the keys of both groups to actuate said mechanism.

5. In a printing machine of the keyboard type,

a frame, a plurality of keys thereon, a carrier' having a plurality of type faces thereon, means including certain of said keys to bring a selected type face into printing position, a work carrier, one of said carriers being mounted for movement to and from the other carrier to effect an impression on work, mechanism to move said movable. carrier including a composite link to controlthe amount of such movement, said link comprising a pair of members movable relative to each other to control the length of said link, means 'under control of said keys to actuate said mechanism, and means under control of certain of said keys and coacting with said composite link to move one of its members toward its other member to decrease the length of said link. i

6. In a printing machine of the keyboard type,

M a-ass airtime a p ra i y Q k ys i l teqn sa -1 avin a. lura it f ype ac there n, m ns n udin er a n o a d eys to ne a s ec e t pe ia in o pri t n P9$ a rk r; 91 2 f s d rrie bei m u ted or m m t 9 and fro h o er carr er 9 efisc imrressisn on work, mech nism t me e said a m -ble carr er. ope ating ean for sa dmeshe nism, an adjustable link pivoted at one end to said meehaa m nd at its o her and to a Operati mean to tra s t t e m ement i Said m an t s id m c s said link nc d 1 ai mb rs mo b e re ati is e. To ether o de re s t e ef e e l ng h i a ,1 1 res ent mea s is rm l y eta sa em ers separate cam an to mo e a d m mbe oa d ach th eans n e c n r o s id keys to actuate said mechanism, and means un- 1 on l f cer ain of a keys d mee in ith Sa d c m m a to crea h en th o said v 11 a. P g i e 9 h keyboa d ypo a plurality of keys, a movably mounted type car.- rier having a plurality of type, means controlled by certain of said keys to position a selected type on said carrier in printing position, a mov- 31 mo ed, W k lmlde means 9 u e relative movement between the work holder and the t pe c rrie to use an p eseiq to be m from s e t and in lu ing a su nt longitudinally movable link, means to .move said link a predetermined distance to cause an impression to be made, said link comprising a pair of longitudinally extending members movable relative to each other, cam means to move said members toward each other, resilient means acting on said cam means to move said members away from each other, an adjustable member to limit the movement of said members away from each other, and means actuated by certain of i said keys and projectable into the path of said cam means to counteract said resilient means consequent upon movement of said link.

.8. In a printing machine of the keyboard type, a plurality of keys, a movably mounted type carrier having a plurality of type, means com trolled by certain of said keys to position selected type on said carrier in printing 110E517 .tion, a movably mounted work holder, means to cause relative movement between the work hold-- er and the type carrier to cause an impression to be made from a selected type and including an adjustable member to control the amount of such movement, an operating member having an adjustableconnection with said inemoer, manually settable means to control said adjustable connection, means actuated by oe tain of said keys and operative on said adjustable member to vary the amount of such movement whenever one of the last mentioned I; h actuated, and means to restore said adjustable member following each cycle of operation of said machine. 7

9. In a printing machine of the keyboard type, a frame, a plurality of keys, a movably mounted type carrier having a plurality of type, in controlled by certain of said keys to position a selected type on said carrier in printingposh tion, a movably mounted work holder, a toggle connected to move the work holder relative to the type carrier to cause an impression to be made from a selected type, a rock arm to actuate said toggle, a cam, a link having one end pivotall connected to said rock arm, vroller on the other end of said link and engaging said eam,-said link comprising a pair of telescopically mounted members, a cam pivoted to one of said members and provided with a cam groove, a in or mounted on the other member and coacting with said groove, resilient means acting on said cam to cause said cam to move said telescoping members away from each other, a pin on said earn, an arm mounted on said frame and swingable into the path of said pin, a solenoid emtive y wn q is a iseie said arm, n an electric switch actuatable by certain of said keys to energize said solenoid.

10. In a printing machine of the keyboard e, trams, a plurality of keys, a movably lllounted type carrier having a plurality of typ faces, means controlled by certain of said 1: to position a selected type face on said car in printing position, a movably mounted w holder, a toggle connected to move the work hols or relative to the type carrier to cause an "lpression to be made from a selected type a reek arm to actuate said toggle, a cam, a link having one end pivotally connected to said rock arm, a roller on the other end of said link and engaging said cam, an eccentric connection between said roller and link to vary the effective length of said link, manually settable means to control the position of said eccentric connection, said link comprising a pair of telescopically mounted members, a cam pivoted to one of said members and provided with a cam groove, a re er mounted on the other member and coacting v, said groove, resilient means acting on said com to move said telescoping members from each other, adjustable means to limit said last mentioned movement, a pin on said cam, an arm mounted on said frame and swingable into the path of said pin,-a solenoid operatively connected to actuate said arm, an electric switch actuatablc by certain of said keys to energize said solenoid, and means to release said arm consequent upon the completion of a cycle of operation.

i l. In a printing machine of the keyboard type, a frame, a plurality of manuall operable keys mounted thereon, a type carrier movably mounted on said frame and provided with plurality of type, means including certain of said keys to control the movement of said type carrier to bring a selected type into printing position, a work holding carriage mounted on said frame for bodily movement toward and from said type carrier to eiiect an impression on work, a toggle to move said carriage, a rock arm to actuate said toggle, a link pivoted at one end to said arm, means pivotally connected to the other end of said link to actuate said link, said last named means being under control of said keys, manually settable means to adjust the length of said link to control the forward position of said carriage relative to said type carrier, and means acting automatically consequent upon the operation of certain of said keys to further change the length of said link.

12. In a printing machine of the keyboard type, a frame, a plurality of keys mounted there- I? a latch to latch said rack in an adjusted position relative to said carriage, and means to latch said rack against movement relative to said frame.

13. In a printing machine of the keyboard type, a frame, a plurality of keys thereon, a carrier having a plurality of type faces thereon, means including said keys to bring a selected type face into printing position, a work carrier, one of said carriers being mounted for movement to and from the other carrier to effect an impression on work, means under control of said keys to effect letter spacing of said work carrier, said means including a gear mounted on said frame, a rack movably mounted on said work carrier and coacting with said gear, a latch to latch said rack to said work carrier, means to release said latch, and means actuated by said last named means to latch said rack to said frame prior to its release.

14. In a printing machine of the keyboard type, a frame, a plurality of keys movably mounted thereon, a type carrier having a plurality of type movably mounted on said frame, means controlled by said keys to position said carrier with a selected type in printing position, a work holder movably mounted on said frame, means controlled by said keys to cause relative movement between the work holder and the type carrier to cause an impression to be made from a selected type, means controlled by said keys to move said work holder step by step relative to said frame to effect letter spacing of said work, said last named means including a rack slidably mounted on said holder and a gear carried by said frame and drivingly coacting therewith, a second rack secured to said holder, a stop secured to said frame, a latch arm mounted on the first named rack and movable into engagement with said second named rack to latch said holder thereto and movable into engagement with said stop to latch said first named rack to said frame, said latch arm being at all times in engagement with either said stop or said second named rack, and manually operable means to control the position of said arm.

15. In a printing machine of the keyboard type, a frame, a type wheel rotatably mounted on said frame, a plurality of keys, a plurality of type extending about the periphery of said wheel, key controlled means to bring a selected type into printing position, a pair of parallel rods carried by said frame with their axes in a substantially horizontal plane extending through the printing position, one of said rods having its axis fixed relative to said frame, the other of said rods having its axis movable relative to said frame in said horizontal plane, a carriage slidably mounted on said last named rod for movement axially thereof, means on said carriage to support work, an elongated platen mounted on said carriage and extending parallel with and in the same plane as said rods, toggle means interconnecting said rods to move the axis of the last named rod horizontally to move the carriage toward and from the type wheel to cause an impression to be made on the work, key controlled means to actuate said toggle means, a guide bar fixed to said carriage and extending parallel with said rods but spaced below said plane, means mounted on said frame and engaging said bar t prevent upward movement of said carriage, and means mounted on said frame and engaging said bar to prevent downward movement of said carriage, thereby preventing rocking of the carriage about its supporting rod.

16. In a printing machine of the keyboard type, a frame, a type wheel rotatably mounted on said frame, a plurality of keys, a plurality of type extending about the periphery of said wheel, key controlled means to bring a selected type into printing position, a work holding carriage, a pair of parallel rods carried by said frame, one of said rods having its axis fixed relative to said frame and movable relative to said carriage, the other of said rods having it axis movable relative to the frame and fixed relative to the carriage, said carriage being slidably mounted on said last named rod for axial movement relative thereto, means on said carriage to support work, an elongated platen bar fixed to said carriage and extending parallel to and in the same plane as said rods, toggle means interconnecting said rods to move the axis of the last named rod and the carriage toward and from the type Wheel to cause an impression to be made on the work, key controlled means to actuate said toggle means, a guide bar secured to said carriage and having a pair of oppositely facing surfaces extending parallel with said rods but spaced from said plane, and means mounted on said frame and engaging said bar surfaces to prevent rocking of the carriage about its supporting rod, said bar being freely movable relative to said means in a plane parallel with said first named plane to permit movement of the carriage to and from said type wheel and axially relative to said rods.

17. In a printing machine of the keyboard type, a frame, a type wheel rotatably mounted on said frame, a plurality of keys, a plurality of type extending about the periphery of said wheel, key controlled means to bring a selected type into printing position, a pair of parallel rods carried by said frame, one of said rods having its axis fixed relative to said frame, the other of said rods having its axis movable relative to the frame, a carriage slidably mounted on said last named rod, means on said carriage to support work, an elongated platen bar fixed to said carriage and extending parallel to and in the same plane as said rods, toggle means interconnecting said rods to move the axis of the last named rod and the carriage toward and from the type Wheel to cause an impression to be made on the work, key controlled means to actuate said toggle means, a guide bar secured to said carriage and extending parallel with said rods but spaced therefrom, said bar having oppositely facing surfaces parallel with said lane, and a pair of spaced rollers mounted on said frame and engaging respective surfaces of said bar to prevent rocking of the carriage about its supporting rod, said bar being slidable relative to said rollers in a direction parallel with said plane, and said rollers being mounted with their axes in a plane parallel with the axis of said type wheel and passing through the printing position.

CLIFTON CHISHOLM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 481,376 Spiro Aug. 23, 1892 499,498 Barten June 13, 1893 811,247 Roussel Jan. 30, 1906 2,506,701 Chisholm May 9, 1950

Images