US2192351A - Selecting and printing apparatus - Google Patents

Description

March 5, 1940. E. E. KLElNscHMlDT SKELECTIICG AND PRINTlNG APPARATUS Filed Aug. 13, 1936 13 Sheets-Sheet 1 um WM mm 3M M W d Z Mmh 5, 1940.. E. E. K'LElNSCHMlD-r 2,192,351

SELECTING AND PRINTING APPARATUS Filed Aug. 13, 1956 13 Sheets-'Sheet 2 wmf March 5, 1940. E. E. KLElNscHMlD-r 2,192,351

SELECTING AND PRINTING APPARATUS Filed Aug. 13, 1936 13 Sheets-Sheet 3 March 5, 1940. E. E. KLElNscHMlDT SELECTING AND PRINTING APPARATUS Filed Aug. 13. 1936 13 Sheets-Sheet 4 March 5, 1940. E. E. KLElNscHMlDT 2,192,351

SELECTING AND PRINTING APPARATUS Filed Aug. 13,1956 13 sheets-sheet 5 m1, y MyW (ktm/Mag:

March 5, 1940. E. E. KLElNscHMIDT 2,192,351

SELECTING AND PRINTING APPARATUS March 5, 1940. n. E. KLEINSCHMIDT 2,192,351

` SELECTING AND PRINTING APPARATUS Filed Aug. 13, 1936 13 Sheets-Sheekl 7 IME-,5.

March 15, 1940. E.; KLElNscHMlDT 2,192,351

SELECTING AND PRINTING APPARATUS Filed Aug. 13, 1936 13 Sheets-Sheet 8 @MyW March 5, 1940. E, E. KLElNscHMlDT 2,192,351

SELECTING AND `PRINTING APPARATUS Filed Aug. 13, 1936 13 Sheets-Sheet 9 March 5, 1940. E. E. KLEiNscHMlDT 2,192,351

SELECTING AND PRINTING APPARATUS March 5, 1940.

E. E. KLEINSCHMIDT SELECTING AND PRINTING APPARATUS Filed Aug. 13, 1936 13 Sheets-Sheet l1 March 5, 1940. E. E. KLEINSCHMIDT 2,192,351

SELECTING AND PRINTING APPARATUS Filed Aug. 13, 1936 15 Sheets-Sheet 12 March 5, 1940. E, E. KLElNscHMlDT 2,192,351

SELECTING AND PRINTING APPARATUS Filed Aug. l5, 1936 13 Sheets-Sheet 15 FL' g.

Patented Mar. 5, 1940 UNITED STATES PATENT OFFICE 61 Claims.

The present invention relates to selecting and printing apparatus for use in telegraph circuits and the like and, more particularly, to apparatus of the type in which the selection of characters to be printed is controlled by permutation code signals.

Selective and functional devices heretofore employed in telegraph receivers and like devices have involved mechanical and electrical apparatus which by reason of its complexity has given rise to complications in operation. The selecting mechanism and associated assemblies of the present invention as embodied in telegraph printing apparatus by way of example operates in accordance with new and simplified principles which permit the entire apparatus to be greatly simplied and to operate positively in accordance with received signals.

Accordingly, a primary object of the present invention is to provide a novel form of selecting mechanism embodying the new principles of operation hereinafter disclosed. More specifically, an object of the present invention is to provide a new and simplified form of receiver embodying selection mechanism of the present invention in which the code impulses act to effect stops that directly and progressively position a printing member so that a character is brought intothe ultimate printing position when the last code signal of a code combination or group is received.

A further object of the present invention is to provide a novel and simplied receiver and printer embodying a new form of selecting mechanism adaptable to high speed printer operation and eliminating means hitherto considered necessary for storing a selection or providing overlap for the printing action.

Still a further object of the present invention is to provide a novel and simplified printer embodying novel mechanism for automatically performing a plurality of functions after receipt of the last code signal of a code combination or group of signals.

Another object of the present invention is the provision of a novel form of selector or stop lever embodying a double pivot action whereby the action of the printer is considerably simplified and improved.

A further object of the present invention is to provide a simplified combination of a stop wheel and associated operating mechanism whereby much of the apparatus hitherto considered necessary is eliminated.

Still a further object of the present invention is the provision of a novel and simplified form of ribbon feed and ribbon reversing mechanism wherein proper operation of the ribbon in conjunction with the printing mechanism is assured at all times.

Still further objects of the present invention are to provide novel and simplified mechanisms to select and operate the printer functions such as shift, unshift, line space, carriage return, and the like.

The foregoing and other objects of both general and specic nature will appear in the following disclosure of preferred forms of my invention and from the terms of the appended claims.

In the drawings:

Figure 1 is a plan view of a preferred embodiment of my invention showing the selecting mechanism and the function operating mechanism associated therewith in a typewheel printer.

Figure 2 is a side elevation of the apparatus of Figure 1, showing the selecting mechanism in detail and its manner of cooperation with a signal receiving magnet.

Figure 3 is a front elevation of the apparatus of Figure 1, showing portions of the selecting and printing mechanisms.

Figure 4 is a side elevation of the apparatus of Figure 1 on the side opposite to that shown in Figure 2 showing the printing, inking and shifting mechanism.

Figure 5 is a section of the apparatus taken on the line 5--5 of Figure 1 with a showing of the motor and gears added, showing the operating bails and the function controlling mechanisms.

Figures 6, 7 and 8 show various positions of the selecting levers.

Figures 9 to 15 inclusive show the manner of operation of the selecting levers in connection with the cams and the stop wheel.

Figures 16 to 18, inclusive, show details of the stop lever and its manner of operation with the armature lever.

Figure 19 is a time sequence chart showing the time relation of the Various elements.

Figure 20 is a plan View of the magnet of the apparatus of Figure 1.

Figure 21 is a front elevation of the magnet of Figure 1 showing the pole faces.

Figure 22 is a detail of the armature preferably employed in connection with the magnet of Figures 20 and 21.

Figure 23 is a plan of a preferred modification of the present invention employing the same selector mechanism as previously described but with diiferent function operating mechanism.

Figure 24 is a section taken on the line 24--24 of Figure 23.

Figure 25 is a side elevation of the device showing the modified function operating mechanism of Figures 23 and 24. v

Figure 26 is a detail of the function operating mechanism of Figure 25.

Figure 27 is a further detail of the function operating mechanism of Figures 25 and 26 showing the dual cam assembly.

Figure 28 is a side elevation of the printing mechanism of the printer of Figures 23, 24 and 25.

Figure 29 is a detail of a portion of the shift mechanism of the printer of Figures 23, 24 and 25.

Figure 30 is a detail of a portion of the unshift mechanism of the printer of Figures 23, 24 and 25.

Figure 31 is a plan of a further preferred em.- bodiment of the present invention as embodied in a page printer.

Figure 32 is a rear elevation of the printer of Figure 31.

Figure 33 is a section taken on the line 33-33 of Figure 32.

Figure 34 is a detail of the carriage return mechanism of the printer of Figures 31 to 33, inclusive.

Figure 35 is a detail of the carriage mounting of the printer of Figures 31 to 33, inclusive.

Figures 36, 37, 38 and 39 illustrate the type bar selection and operating mechanism of the printer of Figures 31 to 33, inclusive, in various positions.

Figures 40, 41 and 42 illustrate the operation of a function of the printer of Figures 31 to 33, inclusive, with the elements in various positions.

Figure 43 is a view of the elements of Figure 37 as viewed in side elevation.

Figure 44 is a view of a portion of Figure 41 as viewed in plan.

Figure 45 is a detail of the ribbon feed and reversing mechanism.

Figure 46 is a detail of the ribbon feed operating cam.

Figures 47, 43, 49 and 50 illustrate a manner in which the selector of the present invention may be applied to code bar operation.

Figure 51 illustrates a manner in which the selector of the present invention may be applied in a manner to selectively open and close electrical contacts to operate any desired mechanisms.

Figure 52 is a side elevation of a modied form of inking device for a typewheel printer of the type shown in Figures 4 and 28.

Figure 53 is a plan view of the device of Figure 52 with the typewheel removed.

Figure 54 is a partial section of the device of Figure 52 with the typewheel removed taken on the line 54-54 of Figure 53.

Referring to a preferred embodiment of my invention illustrated in Figures 1 to 22. inclusive` and with particular reference to Figures 1, 2 and 3, motor I has attached to its shaft pinion 2 driving gear 3 which in turn drives a train of gears 4 and 5. Gears 3 and 5 are loosely mounted on shafts 6 and 1, respectively, and tend to revolve such shafts through friction clutches 8 and 9 of substantially identical construction. Shafts 6 and 1 are mounted to rotate in a frame comprising side plates II and I2 connected by cross members I3 and I4, plate II having reinforced foot plate I5. Plate I2 is of skeleton design and is supported entirely by cross members I3 and I4.

Shafts l6 and 1 are mounted in bearings I6 in the upper edges of plates II and I2 and held in place by cap members I1 secured by screws |8 or similar means. Motor I is supported with reference to plates I I and I2 by any suitable means. Gear 4 is an idler gear mounted on stud shaft I0.

As shown in Figure 1, friction clutch 8 comprises plate I9 secured to collar 2| which is fastened by set screw 22 to shaft 6, friction composition 23 lying between the face of friction plate I9 and an oppositely disposed plate 24 which is maintained in engagement with friction composition 23 by means of spring 25 engaging a face of gear 3. The plate 24 is secured to rotate with gear 3 by jaw clutch 26 shown in Figure 3 in connection with clutch 8. A second friction coupling comprising plate and collar assembly 21 fixed to gear 3, friction composition 28, and plate 29 xed to shaft 6 is also preferably employed.

Cam assembly 3| is secured to shaft 6 to rotate therewith through a suitable collar and pin arrangement shown at 32. Cam assembly 3| comprises a series of ve cams 33, 34, 35, 36, and 31 arranged with their operating lobes 38 (Fig. 2), of which each cam has one, approximately 55 degrees apart, each cam. being shaped and arranged to operate in connection with a stop or selecting lever, the corresponding selecting levers being shown at 39, 4|, 42, 43 and 44, respectively.

Cam assembly 3| further comprises cam 45 arranged to cooperate with normal stop lever 46; and cam 41 arranged to cooperate with latch release lever 48, levers 46 and 48 being pivotally mounted on stud 49 secured in side plate II. Levers 39, 4I, 42, 43 and 44 are also mounted on stud 49 but have an elongated bearing aperture 5| as shown in detail in Figures 6, 7 and 8, so that they are permitted a certain amount of displacement as well as rotation at the bearing point. The cams of assembly 3| and the levers upon which they act are preferably spaced by suitable washers 52 to allow of independent movement of the levers and to space the cams in accordance with the levers. The levers may be secured in place by nut 53 secured on the end of stud 49. A latch release lever 48 and cam 41 is provided to release the last selected lever 39 to 44 after the selectingoperation is completed. Slightly in advance of the operation of latch release lever 48, cam 45 operates normal stop lever 46 to place its extension in the path of rotating stop 88 as shown in Figures 2 and 3.

Stop plate 54 is secured to cam assembly 3| by a pair of clamping screws 55 as shown in Figure 2, the holes in stop plate 54 through which screws 55 pass being slightly elongated, as illustrated in Figs. 2 and 16, so as to permit of orientation of stop plate 54 with respect to cam assembly 3| for the purpose of setting cam assembly 3| relative to the selective levers 39, 4I, 42, 43 and 44 in proper relation to the received signals, pointer 56 being provided on stop plate in combination with scale 51 on the cam assembly to aid in orientation. Stop plate 54 is provided with projecting lugs 54 and 55' for a purpose to be later described.

As shown in Figures 2, 16, 17 and 18, start and stop lever 58 is pivoted on stud 59 secured in side plate II and is provided with latch extension 6I, second extension 62 and cam faced extension 63. Spring 64, secured to start and stop lever 58 at 65 and to side plate II at 66, acts upon stop lever 58 to normally hold extension 6| in engagement with projection 62 fixed to armattu'e lever 63 pivoted on stud 64 secured in side plate Il. Latch extension 6| and projection 62 are formed with sufcient clearance so that when on the release of armature lever 63, latch extension 6| has dropped behind projection 62, they do not engage each other when armature lever 63 is operated. When stop lever 58 operates to replace latch extension 6| on projection 62, it momentarily operates armature lever 63 slightly.

Electromagnet 10, connected to a transmitting circuit by wires 66 is secured to plate by bracket 6l and screws 68. Magnet 'I0 is normally energized in accordance with the present practice of operating this type of telegraph receiver and when energized attracts armature lever 63 as shown in Figure 2. Spring 69 is secured to armature lever 63 at 1|, the opposite end of the spring being secured to bolt 12, capable of adjustment in bracket 'I3 secured to plate by lug '|4 and screws 15, thus enabling adjustment of spring 69. Bracket 'I3 also carries adjustable bolt 16, the end of which is arranged to limit movement of armature lever 63 in one direction, movement of the armature lever in the opposite direction being limited by bolt mounted in a suitable threaded lug 18 on side plate Each of bolts '|2, 16 and is preferably provided with a lock nut |9 as shown to enable the locking thereof when in adjusted position.

Fulcrum plate 8| is secured to the upper extremity of armature lever 63 and is arranged to cooperate with levers 39, 4|, 42, 43 and 44, as shown in Figures 6, 7 and 8 in a manner to be later explained.

With reference to Figure 6 (wherein the nngers of stop wheel assembly |9| are not shown) and Figures 7 and 8 wherein stop or selecting lever 39 is shown by way of example, it is assumed that stop wheel |8| has revolved 180 degrees. Lever 39 in Figure 6 is shown in normal position with elongated aperture 5| therein bearing against the lower edge of stud 49 and the upper edge of lever 39 bearing against stop 82, the lever being held in that position by spring 83 secured to the lever by collar 84 and secured to the frame of the printer through stud Each of the selecting levers is provided with like spring 83 to maintain the levers in their normal position resting against post 82 and the lower surface of bearing stud 49. Springs 83 are preferably staggered as shown in Figure 3 for compactness.

In Figure 7, lever 39 is shown in the selected position wherein its upper edge is forced out of contact with stop 82 by the action of its cooperating cam 33, aperture 5| being slightly displaced with reference to stud 49, lever 39 pivoting about plate or fulcrum 8|. In this position, it will be noted, that latch lever 85 through plate 86, which extends the width of the lever assembly, locks the lower side of lug 81 of lever 39 to maintain it in its selective position when engaged by stop |02 of a stop wheel which it is assumed has revolved degrees in a manner to be later described. Each of the selecting levers is preferably formed with a notch 89 to facilitate engagement by fulcrum 8|. The engaging faces of the notch 89 and the fulcrum 8| are formed so that the fulcrum 8| will be locked to prevent movement thereof when they are in engagement. This feature is to insure the completed motion of lever 39 after it has engaged with the fulcrum 8| regardless of whether or not magnet 10 has in the meantime become deenergized. Likewise the outer face of the notch 89 will prevent the fulcrum 8| from moving after the lever 39 has been moved downward slightly thereby insuring the completion of the downward movement of the lever 39 regardless of whether or not magnet lll has become energized before such movement is completed. This arrangement of the faces of the fulcrum 8| and the notch 89 makes possible an operation which is termed point selection in apparatus of the type described herein without special means therefor.

In Figure 8, which represents the unselected position of lever 39, cam 33 has forced lever 39 out of engagement with stop 82 and aperture 5| is displaced with reference to stud 49. Since fulcrum 8| is out of contact with lever 39, the left end of the lever moves downward about plate 86 as a pivot. Plate 86 in this instance operates both as a pivot and lock.

As shown in Figure 2, latch lever 85 is pivoted on stud 9| secured to plate Il and normally held against stop 92 by spring 93 secured to an eX- tension of latch lever 85 as at 94 and secured to the frame of the printer as at 95. As cams 33 to 3'| pass over stop levers 39, 4|, 42, 43 and 44, the latter are moved momentarily in succession, pivoting on fulcrurn 8| whenever magnet 10 is energized. The pivoting stop lever will operate latch lever 85 and become itself latched on plate 86. In operating latch lever 85, the normal stop lever 46 or any previously set stop lever will be released, and be returned to normal position by its spring 83.

Referring now to Figures 1, 2 and 6 to 15, inclusive, the selector levers are set in accordance with the code signals received on magnet 'l0 in the following manner.

Gear 3 is revolved by motor at a constant speed and in approximate timed relation with the speed of a signal transmitter not shown. Gear 3 tends to rotate shaft 6 through friction clutch 8, but shaft 6 is normally held stationary by engagement of lug 55 with extension 62 of stop lever 58 which is released upon the receipt of a start signal as will be later shown.

As is well known, a vgroup of start-stop permutation code signals, by which it is intended to operate this receiver, consists of a start signal, ve selecting signals, and a stop signal. The start signal is an interruption in the circuit, and the stop signal is a closing of the circuit. The five selecting signals are either current or no current, depending upon the characters to be selected, as for instance, the letter A consists of two current and three no-current signals.

To set the selector levers in accordance with the code signals comprising the letter A as above set forth, magnet 10 is denergized by the start signal, releasing armature lever 63, thereby permitting projection 6| of start and stop lever 58 to fall in the rear of projection 62 whereupon spring 64 draws start and stop lever 58 against stop 58' and disengages extension 62 from lug 55' on stop plate 54, permitting shaft 6 to revolve with gear 3. In this position, lever 46, which is only capable of rotation about pivot 49, is in contact with cam 45. Plate 86 accordingly is under the right end of lever 46, plate 86 being over the ends of the remaining levers as in Figure 6.

The first selecting signal, being a current impulse, will cause magnet 65 to attract armature lever 63 and place pivoting plate 8| into fulcruming position as shown in Figure 6. Cam 33 (Fig. 14) then depresses stop lever 39, causing it to fulcrum on pivoting plate 8| as in Figure 7,

forcing the upper cam face of latch extension 81 upward and latch lever 85 outward. This action causes latch bar plate 86 to release stop lever 46 which is returned to its normal position by its spring 83. Immediately thereafter spring 93 replaces latch bar 85 under stop lever 39 as shown in Figure 7.

The second impulse received on magnet 10, also being current attracts armature lever 63 and continuous rotation of shaft 6 will cause cam 34 (Fig. 13) to engage stop lever 4| and cause it to operate latch bar 85 to first release the previously selected stop lever 39 and then become itself latched on the top of latch bar 85. The next signal received on magnet 65, being a no current impulse, will permit armature lever 63 to retract so that fulcrum 8| will assume the position shown in Figure 8, cam 35 (Fig. 12) engaging stop lever 42 to operate it. Since pivoting plate 8| is out of engagement with stop lever 42, the latter will be moved downward, pivoting at the point of latch extension 81 and latch bar plate 86 and will therefore not operate latch bar 85 after cam 34 has passed out of engaging position, lever 42 will return to its normal position. The two following signals, being also of no current character, will operate on magnet 10 and armature lever 63 in the same manner as has just been explained, and no setting of stop levers 43 and 44 takes place.

Stop lever 4| will remain in its set position until cam 41 engages the lever 48 to operate latch lever 85. Before doing this, however, cam 45 will operate stop lever 46, setting the same in stop position with relation to latch lever 85 and holding it there until lever 48 completes its function. Such operation is possible by reason of the relatively long Contact face of cam 45 which accordingly extends its period of contact with lever 46. A time sequence chart illustrating the time relation of the various operations is shown in Figure 19.

After the selecting operation is completed, lug 54 on stop plate 54 engages with cam faced extension 63 of lever 58 to cam the latter outward so that latch extension 8| is replaced on projection 62 and stop extension 62 is positioned in the path of lug 55 of stop plate 54 to halt rotation of shaft 6 until the receipt of another start impulse on magnet 10.

It will be apparent to those skilled in the art that the selector mechanism so far described may be used for a wide variety of remote control, selective switching and other operations. As shown for the purpose of illustration, however, this mechanism is applied to a printing telegraph receiver.

Cooperating with the selector and levers is a stop wheel assembly generally indicated at |0| which has thirty-two separate stop positions that are disposed in rows, each row corresponding to a cooperating stop lever; the rows of stops cooperating with the stop or selector levers progressively doubling in number; the row cooperating with stop lever 39 having one stop; 4|, two stops; 42, four stops; 43, eight stops; and 44, sixteen stops. Stop |02 which cooperates with stop lever 39 is placed 180 degrees from normal stop 88. Stop 88 cooperates with stop lever 45 which it engages in the normal or rest position of the apparatus.

Stop wheel assembly |0I is attached to shaft 1 preferably in the same manner as cam assembly 3|, i. e., by collar and pin arrangement 32. In addition to stop wheel IUI, shaft 1 also carries typewheel I 03 secured thereto by suitable means,

typewheel |03 having two rows of characters thereon. As before described, shaft 1 is frictionally driven by motor through gear 5 and friction clutch 9. Gear 5 preferably rotates at approximately two and one-half times the speed of gear 3. Selective operation of the various selectors or stop levers will permit the typewheel to assume any one of thirty-two positions including the normal stop or rest position of which twentysix positions are each provided with a letter of the alphabet. However, the typewheel will be provided with character markings only at certain positions and will assume the remaining positions during operation of the several functions in a manner to be described.

To set typewheel |03 in a selected position, as for example, for the selection of the letter A, the stop lever 39 will be operated first in the manner previously described, to place its latch extension 81 in the path of stop |02 of stop wheel assembly |0| which is placed 180 away from the normal stop shown at 88, thus permitting stop assembly |0| and typewheel |03 to make one-half revolution. The operation of stop lever 39 will release the lever 46. The second signal to select the letter A will cause stop lever 4| to be operated to place its latch extension 81 in the path of a finger located in the second row of stops of stop assembly IUI. The operation of the lever 4| as described will release lever 39 so that its projection 81 will release stop assembly |0| permitting it and typewheel |03 to turn one-quarter of a revolution.

As previously described for the selection of the letter A the stop levers 42, 43 and 44 are not operated to place their respective projections 81 in the path of the stop fingers. Therefore stop assembly |0| and typewheel |03 will remain in the position set by stop lever 4|. The letter A is so located on the typewheel |03 that it is now set in position for printing.

By setting the stop levers in various combinations, stop assembly Illl and typewheel |03 will be set in any of thirty-one positions, the thirtysecond position being the normal start position, that is when stop 88 is in engagement with lever 46. For a more detailed description of the aforesaid operation, reference may be had to my copending application Serial No. 18,888.

As in my co-pending application Serial No. 18,888 the rotary travel of the nger element of the stop wheel designated herein as |0I, and in the co-pending application as 11, decreases progressively as the successive stop levers are i operated, and likewise as in the previous application above referred to, the typewheel starts rotating immediately after the letter is printed and before the cycle operation representing that letter is completed so that normally the typewheel is always at zero position; all oi' which makes possibe the operation of the present machine without devices for storing signals as they are received and without devices for overlapping the selection and the printing into the following letter. As pointed out in the co-pending application Serial No. 18,888, stop finger assembly IUI and typewheel |03 are not always in the zero position when the first selecting signal of a letter is received on magnet 10. This will occur when there is no appreciable time interval between the groups of signals. However, due to the increased speed ratio of stopwheel assembly |8| over that of selector cam assembly 3| there will always be sufficient time for stopwheel as- CII sembly |0| to assume its correct selected position.

The printing of the selected letter is accomplished in the following manner.

Typewheel |03 is inked by ink roller |04, omitted from Figure l for the sake of clarity, but shown in Figures 2, 3, 4 and 5. Roller |04 is mounted to rotate in a bracket |05 pivoted on plate I2 at |06 Fig. 4, roller |04 being held against typewheel |03 by spring |01 secured to plate I2 at |06. Record paper |09 passes under typewheel |03 through guide mounted on carriage ||2 which is pivoted in bracket ||3 secured to plate I2 by screws |I4. Print lever ||5 is pivoted on stud ||6 mounted in carriage ||2 and has extending from the inner side pin ||1 which is engaged by bifurcated end or fork ||8 of a bell crank ||9 mounted on stud |2| attached to plate |2 as shown in Figures 1 and 3, and is pressed against printing cam |22 by spring |23. Cam |22 has notch |24 therein into which crank ||9 is pulled by spring |23 to actuate pin I|1 and print lever |I5. Fork I|8 permits of oscillation of carriage II2 while maintaining its engagement with pin ||1.

Feed pawl |25 is mounted on printing lever I I5, and engages ratchet or feed Wheel |26 having a suitably knurled roller |21 secured thereto. Pressure roller |28 mounted on bell crank |29 pivoted at |3| cooperates with roller |21 to engage and advance record paper |09. Retaining pawl |32 is attached to carriage I I2 to cooperate with ratchet |26 in advancing paper |09.

Lug |34 is provided on the end of lever ||5 to engage notches |35 cut in slotted bracket or locking plate |36 fastened to plate |2 by suitable screws. Between notches |35, bracket |36 has a double tapered surface |38 to facilitate transfer of lug |34 from one notch to the other. This arrangement is provided to aid in the carriage shift to be later described and to accurately position lever I|5 and carriage ||2 with respect to the two rows of type on type-wheel |03.

When the typewheel is positioned after the selecting operation, shaft 6 continues to rotate and bell crank |I9 drops into notch |24 on cam |22 by the action of spring |23, forcing print lever ||5 upward so that hammer |33 thereon presses record paper |09 against typewheel |03 by an overthrow action created by a slight space in bifurcated part IIB of bell crank ||9 and immediately thereafter moving slightly away from record paper |09, freeing the same from typewheel |03. As printing cam |22 continues to revolve, it forces bell crank ||9 downward and, by carrying with it feed pawl |25, feeds the paper forward, reverse feed being prevented by locking pawl |32.

It is to be understood that the foregoing described mechanism is capable of a wide variety of applications other than thoseA described herein by Way of illustration, and it is intended that such uses of the mechanism be within the scope of the present invention.

Typewheel |03 is provided with two rows of characters, one comprising letters and the other figures. To shift the printing from one row to the other, T-shaped crank |39 is pivoted on bracket |4I through stud |42 and attached to carriage I I2 by link |43 through pivot screw |44. Link |43 is secured to carriage ||2 by pivot screw |45. To operate T-shaped crank |39 and thereby shift carriage ||2, two selector discs |46 and |41 are provided on shaft 1. Cooperating with selector discs |46 and |41 are two shift levers |48 and |49, respectively, pivoting on a stud |5| secured in plate I2. These levers operate in like manner so that it will be necessary to describe only the operation of one.

With reference to Figure 5, shift lever |48 is pivoted on stud |5I, its upper end being provided with extension |52 which may drop into notch |53 of selector disk |46. The other eX- tremity I6| of shift lever |48 engages cam |54 on shaft 6 and is normally held in contact therewith by spring |55 attached to lever |48 at |56 and to stud |51 in plate l2. Lower extension |58 of shift lever |48 engages arm |59 of crank |39. A notch |62 is provided in cam |54 to engage extension |6| of lever |48.

When the signal impulses for shift condition are received on magnet 65 and shaft 1 is set in a corresponding position by the stop levers and stopy wheel |0I, notch |53 of disk |46 will be moved to a position to receive projection |52 of lever |48, and as cam |54 continues rotation, projection |6I of lever |48 will go into notch |62 on cam |54 through the action of spring |55. The lower end of lever |48 at |58 will move clockwise to engage arm |59 of T-crank |39 to shift carriage ||2.

To prevent printing when shifting, a nger |63 is secured to shaft 1 to rotate therewith and is positioned so that it will engage projection |64 on print lever ||5 when carriage I|2 is to be shifted. While the print lever II5 will be raised by crank |I9 when the shift function occurs, hammer |33 will not strike the paper due to projection |64 coming into engagement with finger |63.

Finger |63 is one of four fingers mounted on shaft 1 to rotate therewith. Fingers |63 are so disposed in relation to the position of the typewheel that one will be positioned to engage projection |64 whenever a function is selected to thereby prevent printing.

To operate a function in the figure shift position, such as ringing a bell, closing a contact, or any other operation that may be desired, finger |65 is provided in a position where it will contact projection |64 only in figures shift position.

In operating a signal bell, selector disk |66, provided with slot |61 positioned in the selective position for operating the signal bell, isA mounted on shaft 1. Cam |68, similar to cam |54 is mounted on shaft 6. Lever |69, similar to T-shaped shift lever |48, is pivoted on stud |5|. Unlike lever |48, lever |69 has two lower extensions I1I and |12. Extension |12 is a bell clapper. Extension |1| is placed so that it will engage with lug |13 forming part of link |43 when the shift is in the operating position to print letters, thereby preventing clapper |12 from striking bell |14 when a letter is to be printed. When carriage I|2 is shifted to print figures, lug |13 is out of the path of extension |1| and at that time clapper |12 will strike bell |14 when the signal selection is received on magnet 65.

While the function mechanisms just described have been shown in connection with a typewheel printer, it is to be understood that such showing is only by way of example and other applications of the disclosed mechanism are intended as coming within the scope of the present invention.

Referring to Figures 20 and 21, a preferred form of magnet is therein illustrated. As shown,

magnet 65 preferably has a U-shaped core |15v constructed of laminations of iron or other desirable magnetic material, coils |16 being pre- Wound on forms so that they may be slipped thereover. Pole faces |11, each consisting of two U-shaped magnetic members |18, are fastened to the protruding ends of the core after coils |16 are placed thereon. The U-shaped magnetic members |18 are secured by suitable means such as pins |19. Pole faces |11 serve to increase the pole face area of the magnets and also serve to hold wire coils |16 in place.

Referring to Figure 22, a View of armature lever 63 is there shown as pivoted on stud 64. As shown, lug 62 projects from one side of armature 63, fulcrum 8| being secured to the top thereof in a position to engage the various selector levers in the manner previously described.

In Figures 23 to 30, inclusive, a further preferred modification of the printer of Figures l to 22, inclusive is shown. Since the signal receiving and selecting mechanism is the same as in the rst modification, the description thereof will not be repeated. Shaft 6 is employed with gear 3 and friction clutch 8. Shaft 1 with friction clutch 9 and gear 5 thereon has typewheel |03 thereon. Gear 4 in the present modification is not only an idler gear but is also utilized in connection with the function operating mechanism in a manner to be later described.

Referring to Figures 23, 25 and 28, paper carriage |93 is mounted on slidable bar |94 by suitable fastening means |95. Bar |94 slides in slot |96 in side frame |91. Stud |98 fastened to bar |94 is guided in aperture |99 in side frame 20| Paper carriage |93 is generally similar to carriage ||2 of the printer of Figure 1 in that it comprises paper guide 202, paper feed ratchet 203 actuated by pawl 204 and held against reverse rotation by pawl 205. Paper carriage |93 is not pivotally mounted but is secured to bar |94 so that despite the shift position, it is always in a plane normal to the axis of typewheel |03 and parallel to side frame |91. To shift paper carriage |93, bell crank lever 206 is mounted on stud 201 fastened in plate 208 attached to side frame |91. Depending arm 209 of bell crank lever 206 is bifurcated at 2|| to engage stud 2|2 fastened to bar |94. Latch lever 2|3 is mounted on stud 2 |4 fastened to plate 208 and normally urged clockwise by spring 200. Spring 2|5, connected to projection 2|6 on bar |94 and to side frame |91, holds projection 2|1 on bar |94 against stop 2|8 as shown in Figure 25 which is the letters printing position.

Latch lever 2|3 will engage lug 2|9, forming a part of depending arm 209, when bar |94 is moved to the left, as viewed in Figure 25.

To move carriage |93 into figures printing position, a group of signals comprising a no current start signal, two current signals, one no current signal, and two current signals, and a stop current signal, for example, are received on the selecting magnet and operate on the mechanism controlling shaft 1 to set the latter so that notch 22| in disc 222 will be opposite finger 223 on lever 224 pivoted on stud 220 on side frame |91. Thus as shaft 6 continues to rotate, projection 225 on lever 224 will enter notch 226 of operating cam 221. Lever 224 will then be partially rotated by spring 228 to operate latch 229 composed of two lever elements 230 and 230 fiXed to a rotating collar 232 and connected to lever 224 by link 23| to release slidable member 233 mounted on lever 206 as shown in Figure 25. Member 233 is slidable on bar 206 by means of screw and slot connections 234.

Cam 235 is mounted on idler gear 4 which rotates continuously at a speed approximately twice that of selector shaft 6. When slidable member 233 is released spring 236 acts upon it through lug 23`| to place roller 238 in the path of cam 235, spring 236 also being fastened to lever 206 at 239. Upon engagement of cam 235 with roller 238, lever 206 is rotated to move slidable bar |94 to the left, as viewed in Figure 25, whereupon latch lever 2I3 engages lug 2|9 to hold bar |94 in the set position. Face cam 24|, also fastened to gear 4, will engage projection 242 of slidable member 233 after the latter has been subject to operation by cam 235 and move member 233 to the right, as viewed in Figure 25, until the latter is again engaged by latch 229.

During the operation just described, selector shaft 6 will have continued to rotate and finger 223 of lever 224 will have been withdrawn from notch 22| in disc 222 thereby freeing latch 229.

To move bar |94 so that carriage |93 will be in the letters printing position, a disc 243 is provided with notch 244 so positioned that when the letters shift signals comprising a no current start signal, five selecting current signals, and a stop current signal are received on magnet 65, it will' be opposite finger 245 on lever 246 whereupon lever 246 will be operated by spring 241 and cam 248 with notch 249 in the same manner as the operation of lever 224. Lever 246 when operated will engage upper projection 25| of latch lever 2 I3, pressing lever 2|3 down to disengage it from lug 2|9 whereupon spring 2|5 will move bar |94 and carriage |93 into letters printing position.

The paper feeding mechanism is mounted in the paper carriage 202 in the same manner as in the tape printer previously described. The printing hammer 26|, however, is mounted on shaft 252 Which has a bearing at 253 in paper carriage |93 and a bearing at 254 in plate 208. Shaft 252 reciprocates with the shift and unshift operations of paper carriage |93. Print operating bell crank 255 is secured to shaft 252 and is provided With lug 256 that engages operating cam 251 mounted on selector shaft 6. Bell crank 255 is also provided with extension 258 arranged to engage stop fingers 259 mounted on shaft 1 whenever a function such as shift, unshift, space or signal is selected to prevent the printing hammer from striking the paper tape to prevent printing when a function is to be operated.

For printing and feeding, hammer 26| is provided on arm 262 secured to shaft 252 with pawls 204 and 205 engaging feed ratchet 203 which has knurled roller 203 thereon against which the paper is pressed by roller 263 mounted on arm 264 held in place by spring 265 and pivoted at |3|.

In the present modification it will be noted that print operating bell crank 255 operates to release arm 262 so that it may be swung to printing position by spring 266 secured to the right end of arm 262 at 261 and to carriage |93 at 268. Since arm 262 is fixed to shaft 252 With bell crank 255, the camming action of cam 251 will return arm 262 to its non-printing position.

Referring to Figures 3l to 46, inclusive, a further preferred embodiment of my invention in a page printer is shown. Since the selecting mechanism employed therewith is identical with that previously described in connection with the printer of Figure 1, up to the transmission of movement to the shaft 1 from the stop wheel assembly I0 I, a description of the selecting mechanism at this point is not necessary. For convenience, the reference characters applied to the selector mechanism of the printer of Figures 31 to 46, inclusive, are the same as those employed in the description of the printer of Figure l and reference may be had thereto.

As shown in Figures 31 and 32, the printer about to be described generally resembles a typewriter in that it is adapted to print upon a page rather than upon a tape. Base 28| with upstanding frame 282 supports frame 299 extending across the machine and supporting carriage supporting tracks 283 and 284 for reciprocating carriage 285. The latter is supported from track 284 by ball bearings 286 and track 281, rollers 288 mounted on the carriage on shaft 289 to ride on track 283. The outer ends of shafts 289 have L-shaped clips 29| secured thereto to engage the underside of track 283 and hold the carriage on the track. A plate 282 is secured to track 284 to engage slot 293 in track 281 for a like purpose. A platen roller 294 is carried in carriage 285 in a manner common in typewriters and is provided with ratchets 295 and pawls 296 for line advance in a manner to be described. Platen roller 294 is formed with handle 291 at one end and is supported by two L-shaped brackets 298 secured to track 281 by suitable fastening means. Spring pressed paper holders 308 are provided to cooperate with platen roller 294, paper shield 309 also being provided for guiding paper into the printer and keeping it free of the operating mechanism.

To effect vertical shifting of platen roller 294 and its supporting means, shift frame 299 is provided with connecting means 30| to track 284 and connecting means 302 to track 283, as shown in Figure 35. Thus when shift frame 299 is moved vertically, tracks 283 and 284 are carried therewith to move platen roller 294 and its supporting means.

Frame 299 has lugs 303 at its lower end with pins 304 therein arranged to slide in and be guided by apertures 305 in lugs 306 integral with frame 282. Springs 301 are provided between lugs 303 and lugs 306 to normally maintain frame 299 in its uppermost position, nuts 308 being secured to the lower ends of pins 304 which are threaded. Frame 299 is also guided for Vertical movement by lugs 309 secured to frame 282 by suitable means.

Stop Wheel |0| which is fixed to shaft 1 is preferably geared in a 3 to 1 ratio to spider 3|| mounted on shaft 3|2 carried by hub 3|3 on arm 3|4 secured to the printer, shaft 3|2 having worm gear 3|5 to engage worm 3|6 on shaft 1.

Spider 3| comprises three projecting lugs, each of which is slotted to receive a lever 3|1 which is pivoted at 3|8. A projection 32| forming part of each lever 3|1 is normally pressed against a face of the spider by collar 323 of spring 322. Spring 322 which is mounted on a projection of the spider shaft 3|2 is held thereon by a washer 324 and nut 325.

This arrangement permits of a pivoting of levers 3|1 about pivots 3|8, the pivoting being limited by spring 322 and contact of projections 32| with a face of the spider 3| I. Spider 3|| is rotated to bring one of fingers 3|1 into selected position opposite an operating bar 326 by positioning stop wheel assembly |0| in a manner previously described in connection with the setting of typewheel |03. Three fingers 3|1 are provided by reason of the 3 to 1 ratio between stop wheel |0| and the spider 3| l.

When one of' fingers 3|1 is positioned opposite an operating bar 326, setting bail 321 mounted on arms 328, in turn pivoted on shaft 329 and having an extension 33|, is operated by extension 33| dropping into notch 332 in cam 333 mounted on shaft 6. Immediately thereafter extension 334, also pivoted on shaft 329, and carrying operating bail 336, drops off ledge 331 of cam 338 mounted on shaft 6.

The function of the elements` to set and operate an operating bar 326 is shown in the various positions in Figures 36 to 39, inclusive. Figure 36 shows the normal or rest position of the elements. Figure 37 shows how a selected finger 3|1 when operated by setting bail 321, places an operating bar 326 in the path of operating bail 336 by contacting upper cam face 343 of operating bar 326 and forcing bar 326 downward as finger 3|1 is pivoted about pin 3|8 by bail 321. Figure 38 shows setting bail 321 returned to its normal position and operating bail 336 in engagement with operating bar 326. Finger 3|1 is returned to its normal position by spring 322 and collar 323 acting on lug 32|.

Figure 39 shows operating bail 336 in its final position and operating bar 326 out of engagement with operating bail 336 which occurs when a selector type bar 339, due to its inertia, has completed its printing stroke and carried operating bar 326 slightly beyond the travel of operating bail 336, thereby disengaging bar 326, the position of bar 326 during actual printing being shown in dotted lines (Fig. 39). When this disengagement takes place spring 34|, connected to bar 326 at 342 and to frame 282, is arranged to lift the operated end of operating bar 326 slightly upward to permit it to return over the top of operating bail 336 to normal position as shown in Figure 36.

It will be noted that the setting of a selected operating bar 326 and the restoring to normal of its selector finger 3|1 is accomplished in a short interval of time, and it is not necessary for finger 3|1 and spider 3|| to remain set after bar 326 has been engaged by operating bail 336. This is necessary as stop wheel assembly |0| is held for only a minimum of time so as to permit it to again revolve to the next selected position without waiting for complete operation of the printing function. Operating bail 336 engages operating bar 326 immediately after the latter is positioned, engagement between these two members being maintained by having slight undercut faces 344 and 343 on their respective engaging surfaces.

Type bars 339 are pivoted on wire 345 and are supported in a manner common in typewriters by arcuate shaped bracket 346 secured to frame 282 by suitable means. Each type bar has two characters thereon as shown at 341 and each is provided with gear teeth 348 arranged to engage racks 349 on operating bars 326 which are held in engagement with gear teeth of the selected type bar 339 by a semi-circular ring 35| secured to frame 282 by suitable means.

In accordance with the setting of stop wheel assembly |0|, fingers 3|1 can assume thirty-two selected positions. Corresponding with these selected positions, thirty operating bars 326 are provided, twenty-six of these operating type bars, the other four operating the space, shift, unshift and line feed functions. No operating bars are

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