US2339313A

US2339313A - Printing telegraph apparatus

Info

Publication number: US2339313A
Application number: US397193A
Authority: US
Inventors: Walter J Zenner
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1941-06-09
Filing date: 1941-06-09
Publication date: 1944-01-18
Anticipated expiration: 1961-01-18
Also published as: DE917977C; NL78940C; GB556700A; CH267820A

Description

Jan. 18, 1944- w. J. ZENNER 2,339,313

PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet 1 INVENTOR. WALTER J. ZENNER BY JM ATTORNEY.

Jan. 18, 1944. w. J. ZENNER 2,339,313

PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet 2 246 I65 267 245 7 All i 242 Ill L254 FIG.2

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9e TYPE SEG. ELEV. STOP CAM 97 SEG. STOP ACT. CAM 9e TYPE SEG. RESTORING CAM 99 SE6. STOP ACT. CAM I00 TYPE SEG. ELEV. STOP CAM lOl TYPE SEC. 080; CAM I02 CODE BAR SETTING CAM lO3-CODE'BAR UNLOCKING CAM I04 PRINT HAMMER CAM I05 TYPE SEG. ELEV. CAM

INVENTOR. WALTER J. ZENNER ATTORNEY.

Jan. 18, 1944. w. .I ZENNER 2,339,313

PRINTING TELEGRAPH APPARATUS Filed June 9, 19,41v 1'4 Sheets-Sheet 4 FIG. 5

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w. J. ZE NNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 nu! HIIHHIIIIIIH II ll Illlllllll lllllilll 14 Sheets-Sheet 5 INVENTOR.

WALTER J. ZENNER Jan. 18, 1944.

W. J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet 6 Nnm . INVENTOR. WALTER J. ZENNER ATTORNEY.

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INVENTOR. WALTER J. ZENNER BY 6? ATTORNEY.

Jan. 18, 1944.

w. J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 l4 Sheets-Sheet 8 INVENTOR.

WALTER J. ZENNER hon ATTORNEY.

Jan. 18, 1944. w. J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet 9 Em mwv n? mow m6 8 INVENTOR. WALTER J. ZENNER mum N00 mum Jan. 18, 1944. w. J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet l0 hwn wvm Non hvm INVENTOR. WALTER J. ZENNER mmm Jan. 18, 1944. w. J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet ll mum . INVENTOR.

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Jan. 18, 1944. I w, ZENNER 2,339,313

PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet 12 FIG. I?

Jan. 18, 1944. w. J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 14 Sheets-Sheet 13 ATTORNEY.

l4 Sheets-Sheet l4 J. ZENNER PRINTING TELEGRAPH APPARATUS Filed June 9, 1941 Jan. 18, 1944.

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INVENTOR. WALTER J2 ZENNER 'ITORNEY.

Patented Jan. 18, 1944 2,339,313 PRINTING TELEGRAPH APPARATUS Walter J. Zenner, Des Plaines, Ill., assignor to Teletype Corporation, Chicago, 111., a corpomtion of Delaware Application June 9, 1941, Serial No. 397,193

37 Claims.

This invention relates to printing telegraph apparatus and more particularly to telegraph printers having axially and angularly displaceable type carrying segments. 7

An object of the invention is the provision of a selector mechanism for printing telegraph apparatus which includes a minimum of parts capable of being manufactured and assembled at low cost and of being operated efficiently and reliably at high signaling speeds.

Another object of the present invention is the provision of a telegraph printer which is relatively inexpensive, simple and eflicient'and which may be operated at high signaling speeds.

According to the embodiments of the inventiondisclosed herein, there is provided a type segment divided into four horizontal sections and divided into two halves, each half having four vertical rows of character positions in each case shift position. The characters are arranged on the type segment for selection in response to the receipt of code signals in such mannerthat characters represented by signals having a marking characteristic for a predetermined impulse of a five impulse code are on one-half of the segment and character represented by signals having a spacing characteristic for the said predetermined impulse are on the other half of the segment. Signal responsive means are provided which upon the receipt of said predetermined impulse will bias the segment to move in one direction or the other depending upon the character of the code impulse received. The spacing or marking impulses received in the other impulse periods determine the level to which the segment will be elevated and the angle of rotation thereof from a zero position, irrespective of the direction of rotation thereof. Signal responsive means is provided for permutatively shifting a series of three segmental stop members having segment stopping shoulders on them for controlling the distance the type segment will move when biased in one direction or the other. The impulses received in two of the impulse periods will control the setting of these segmental stops, whereas the impulses received in another two impulse periods will control the height to which the type segment is elevated, periodically operated mechanisms being provided i or urging the type segment to rotate and to move upwardly at predetermined times in the cycle of operation of the apparatus and permutatively set means being provided for interrupting the rotative and upward movement of the segment at various angular positions and different levels,

The apparatus described generally hereinbefore will provide thirty-two selections; however, since it is necessary to have more than thirty-two characters, the type segment may be set by a case shifting and. unshifting mechanism similar in ultimate effect to the case shifting mechanism of the usual form of typewriting or teletypewriting apparatus. This case of shifting mechanism comprises apparatus for shifting the entire assembly of segmental stop members a short distance upon receipt of a shift or unshift signal. I

The foregoing brief description of the features of the present invention apply particularly to the mode of selecting the type to be utilized in printing a character. This apparatus is equally adaptable to either tape printing apparatus or page printing apparatus and may be almost identical in construction in either apparatus.

In accordance with one embodiment of the invention, as applied to a tape printer, the various functions, that is, the operations other than character printing operations which are to be performed by themachine, arecontrolled by permutatively set code bar which permit a. shift lever or an unshift lever to move to a predetermined position under the influence of an actuating spring when a predetermined code is set up on the code bars. Movement of either of the aforementioned levers to their set position will control the shift or unshift operation of the apparatus. In the event that the transmitted signal represents either a shifting or unshifing operation, the print hammer, which in the case of a. tape printer is invariably actuated and permitted to move under spring pressure toward printing position, is barred from striking the tape and instead of performing a printing operation the power stored in the print hammer actuating spring is used to effect the shift or unshift operation'and the settable levers which control shifting or unshifting will move normally spring biased levers against the tension of their respective spring into position to be struck by an extending portion of the assembly which moves with the print hammer, thereby to cause the group of segmental stop members to be shifted bodily, due to the fact that the spring biased levers are mounted on the plate which carries the segmental stop members.

In the \embodiment of the invention shown herein which is adapted for printing on tape, the only functions which are performed by the apparatus are shift, unshift and character spacing as is usual in tape printers. Accordingly, the

shift and unshift operations are performed as described hereinbefore and spacing is performed for each operation of the printing hammer whether the signal received is a character representing signal or a shift or unshift signal.

. In the embodiment of the invention applied to apage printing apparatus, wherein the code for figures case shift, in the standard start-stop five unit code in use, is all marking except the third g ment in one direction or the other to move an assembly of segmental stops and thereby effect case shifting. In this embodiment of the invention the first and last impulses of the five unit code determine the setting of segmental stops to determine the amount of oscillation of the type segent, the second and fourth impulses determine the extent of elevation of the type segment, and the third impulse determines the direction of rotation of the type segment.

In the page printing embodiment of the invention, it is necessary to perform functions in addition to those which are performed in connection with the tape printing apparatus, that is, line feed and carriage return, and the mechanism for spacing isslightly more complicated due to the fact that the carriage must be spaced rather than simply character feeding a strip of paper tape. The mechanism is, however, controlled in substantially the same manner as in the tape printer in that the controlling of the functions is effected by slidable bars selectively driven by a selector cam assembly to select code bars for actuation. In addition there is provided in the main cam assembly a trip which releases the clutch of a secondary cam assembly near the end of the cycle of the main cam assembly for supplying actuating power to the function mechanism selected for actuation and this cam assembly will supply the power to cause either printing or the function to be performed during the setting up of the succeeding code of characters to be printed by the apparatus.

A better understanding of the invention may be had by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein,

Fig. 1 is a plan view of a tape printer embodying the features of the invention;

Fig. 2 is a side elevational view of the apparatus shown in Fig. 1, parts being broken away more clearly to show important parts which are in back;

Fig. 3 is a sectional view taken substantially along the line 3-3 of Fig. 1 in the direction of the arrows;

Fig. 4 is a fragmentary sectional view taken substantially along the line 4-4 of Fig. 3 in the direction of the arrows;

Fig. 5 is a fragmentary sectional view taken substantially along the line 55 of Fig. 2 in the direction of the arrows;

Fig. 6 is a fragmentary sectional view taken substantially along the line 6-5 of Fig. 5 in the direction of the arrows;

Fig. 7 is a diagrammatic chart showing the timing of the various parts of the tape printer apparatus with respect one to another;

Fig. 8 is a fragmentary sectional view taken on present invention, part of the base and keyboard of the apparatus being broken away to show more clearly details of the invention by showing them on a large scale;

Fig. 10 is a plan view of the structure shown in Fig. 9, one end of the apparatus being broken off in order to show the important features of the structure on a large scale;

Fig. 11 is a transverse vertical sectional view taken along the line I l-l l of Fig. 9 in the direction of the arrows showing a large number of the parts of the apparatus in front elevation;

Fig. 12 is a plan sectional view taken along the line l2-l2 of Fig. 9 in the direction of the arrows showing the arrangement of the segmental stops and some of the function selecting mechanisms, as well as a portion of the function performing mechanisms;

Fig. 13 is a plan sectional view taken along the line l3l3 of Fig. 9 in the direction of the arrows showing details of the function selecting mechanisms, particularly those mechanisms involved in spacing operations;

Fig. 14 is a vertical sectional view taken along the line l4--l4 of Fig, 12 in the direction of the arrows showing some details of the mechanism for controlling the height to which the type segments will be elevated and the amount which it may be rotated;

Fig. 15 is a vertical sectional view taken along the line l5--l5 of Fig. 12 in the direction of the arrows showing some details of the mechanism for actuating the segmental stops and restoring them to normal position, as well as some details of the mechanism for actuating and controlling the type segments vertical movement;

Fig. 16 is a vertical sectional view taken along the line Iii-l6 of Fig. 12 in the direction of the arrows, showing some details of the function selecting mechanism for line feed, spacing, printing, spacing cut-out, carriage return and func-' tion restoring mechanisms;

Fig. 17 is a vertical sectional view taken along the line "-41 of Fig. 16 in the-direction of the arrows, and also showing some details of the segment controlling mechanisms and function selecting and operating mechanisms;

Fig. 18 is a plan sectional view taken along the line iii-l8 of Fig. 15 in the direction of the arrows, and showing some of the details for biasing the type segment to rotate in a selected direction. This figure is on a somewhat enlarged scale to more clearly illustrate this portion of the apparatus;

Fig. 19 is a horizontal sectional view taken along the line l9-|9 of Fig. 9 in the direction of the arrows, and showing some of the details of the apparatus for effecting case shifting operations;

Fig. 20 is a vertical sectional view taken along the line 20-40 of Fig. 19 in the direction of the arrows, showing in side elevation some of the mechanism for effecting case shifting operations;

Fig. 21 is a timing chart showing the relative time of operation of the various cams in the apparatus, and illustrating the time in which the various functional operations are performed;

Fig. 22 is a fragmentary vertical sectional view, taken on the line 22-22 of Fig. 13 in the direction of the arrows, showing details of the part of the mechanism which initiates operation of the apparatus; and r Fig. 23 is a developed view of the face of the type segment.

Tape printer Referring now to the drawings wherein like reference characters designate the same parts throughout the several views particular reference being had to Fig. 1 at this time, the numeral 3| designates a base plate upon which the apparatus is suitably mounted. In this embodiment of this invention the apparatus is shown as a receiving instrument and no transmitting apparatus has been shown in connection with it; it will be understood, however, that suitable transmitting apparatus to which the apparatus of the present invention may respond may be and usually is supplied with an apparatus for receiving messages such as that to be described herein. A suitable transmitting and controlling apparatus is shown in Patent No. 1,595,472 to H. L.. Krum, dated August 10, 1926. The apparatus of the present invention is made up of a number ofsub-assemblies suitably mounted on the base 3| and which will be designated hereinafter as the selector magnet assembly 32, Fig. 3, the driving assembly 33, the operation selecting assembly 34, the type segment operating assembly and tape feeding assembly 36.

Selector assem ly The selector assembly has been designated with the reference numeral 32 (Fig. 2) and comprises a main supporting block from which extend horizontally a pair of armature mounting bracket spacers M and 42 which in turn carry an armature pivot plate 43. Extending from the armature pivot plate is a pin 44 to which one? end of a spring 45 is connected. The spring 45 has its opposite end connected to an armature 46 and normally tends to rock the armature 46 in a clockwise direction, Fig. 2, away from a core member 41 of a selector magnet having a pair of coils 48 and being responsive to transmitted signals which may be transmitted by any suitable transmitting apparatus either at a distant station or mounted in association with the apparatus constituting the present invention.

The magnet assembly supporting block 40 has mounted upon it the coil and cores which form the magnet, and the armature 46 is interconnected with the armature supporting plate 43 by a leaf spring 49 riveted to the armature 46 as shown at 50 (Fig. 3) and secured to the supporting plate 43 by means of screws 5|. A secondary plate 52 is mounted on the top of the supporting block 40 and supports an upwardly extending post 53 on the upper end of which are threaded armature adjusting nuts and lock nuts 54 and 55, respectively.

As is usual in magnet constructions of this general type, the magnet assembly 32 includes an insulator 56 (Fig. 2) carrying the usual terminal screws 51 to which the terminal of the wires of the magnet windings may be connected for connection of the incoming line to the magnet.

Driving assembly The driving assembly which is designated generally by the reference numeral 33 (Fig. 1) comprises a. motor 66 mounted on the base 3| and connected to any suitable source of power. The

motor 66 is either a synchronous motoror has the usual governor mechanism on it for regulating the speed of rotation of its driven shaft 61. The shaft 61 carries a spiral gear 63 which meshes with and drives a, spiral gear 69 suitably connected to the right end (Fig. 1) of a shaft I0. The shaft I0 is journaled in a pair of posts 1| and I2 (Fig. 5) which are mounted upon the base plate 3| and extend upwardly therefrom, the posts being spaced apart and braced by a cross member I3. Mounted upon the shaft I0 are a series of sleeves I4 and I5, and I6 and 11 (Fig. 5). The sleeves I4 and TI serve as spacers for suitably positioning the gear 69 with respect to the gear 68 and to hold the sleeves I5 and I6 in their proper position between the posts II and 12. The sleeve I5 is fixed to the shaft I0 and the sleeve I6 is freely rotatable about the shaft I0, the sleeve I5 carrying a driving clutch member 18 and the sleeve I6 carrying a driven clutch member and a series of camsfor actuating the various parts of the apparatus at predetermined times in the rotation of the assembly in which they are included. The driving clutch member I8 is a ratchet wheel and is formed integrally with sleeve I5. Since the sleeve 15 is fixed to the shaft I0 the driving clutch member will rotate at all times that the power is supplied to the motor 66.

Fixed to the sleeve I6 is a relatively large disc on which are carried a spring supporting post 86, a spring guiding post 81, a pawl carrying post 88 land a pawl stop (not shown). A series of springs 90 are fixed to the spring supporting posts 86 and normally tend to move pawls 9| individual to them in a direction so that the tips of the pawls will engage with the teeth of the ratchet or driving clutch member I8. The disc 85 is interconnected with the sleeve 16 by means of a plate 92 which has arms extending out from it and bearing against the disc 85, suitable screws 93 being provided for interconnecting the plates 92 withthe disc 85. Suitably secured to the sleeve I6 as best seen in Fig. 6 are series of twelve cams which together with a cam formed on the disc 85 serve to operate the various instrumentalities of the apparatus in the proper sequential order. These cams reading from right to left in Fig. 6, are the armature blocking cam 94, the type segment oscillating cam 95, the type segment elevator stop cam 96, the segmental stop actuating cam 91, the type segment restoring cam 96, the segmental stop actuating cam 99, the type segment elevator stop cam I00, the type segment oscillating cam IN, the code bar setting cam I02, the code bar unlocking cam I03, the print hammer actuating cam I04 and the type segment elevator cam I05, respectively. The time of operation of these cams is clearly illustrated in the timing diagram shown in Fig. '7.

Operation selecting assembly tus. Type segment oscillating cam 95, type segment elevator stop cam 96, segmental stop actuating cam 91, type segment restoring cam 99, segment stop actuating cam 99, type segment elevating stop cam I00 and type segment oscillating cam IOI form a part of the operation selecting assembly of the apparatus and they together with code bar setting cam I02 each have associated with them a lever for selectively actuating slidable bars designated II3 to "9, respectively, for association with the cam levers which are designated I23 to I29, respectively. These cam levers are pivotally mounted on a rod I30 (Fig. 3) which is mounted in a" lever supporting block I3I and which also pivotally supports an armature blocking lever I32 (Fig. 5) and a center-stop lever I33. The armature blocking lever I32 is normally in the path of the armature and serves to prevent movement of the armature 46 toward the magnet core 41 except at the places where the high portion of the armature blocking cam is in alignment with the armature blocking lever. The armature blocking lever is in turn held away from the low portion of its cam when the armature is attracted, the normal position of the armature when the apparatus is at rest, the starting pulse for the operation of the apparatus being a spacing pulse and the stopping pulse being a marking pulse. Thus, when a code has been received by the apparatus and the stop impulse or the marking impulse is then received, the armature will be attracted and the next time that the armature blocking cam moves the armature blocking-lever away from/the armature, the armature will be permitted to drop down into the path of the armature blocking lever and will carry latching arm I34 of the armature blocking lever into the path of the pawls 9|. The pawls will thus be moved out of engagement with the ratchet and held in that position until a start or spacing pulse is received at which time the armature of the electromagnet will be released and will permit the armature blocking lever to move toward its cam under the action of its spring, a low portion of the cam being in alignment with the-lever I32 at this time. In this manner, the clutch will be engaged and the cycle of operation of the cams on the cam sleeve I6 will follow in sequence.

The upper forward end of the cam levers I 23 to I29, Fig. 8-A, inclusive, are notched in such a manner that they will be blocked from moving toward the right (Fig. 3) of the machine when the armature 49 is moved to its marking or spacing position at the time the low part of the cam associated with a particular cam lever is in alignment with the cam lever, thereby to prevent some of the cam levers from moving forward on a marking impulse and to prevent others of the cam levers from moving forward on the spacing impulse. Those cam levers which are prevented from moving forward at the interval in the cycle when they are in association with the low point on their associated cam, will, when the high point of the cam moves into association with the cam levers, be rocked toward the rear of the machine without any effect on their associated slidable bars. However, if certain cam levers are permitted to drop to their forward position due to the fact that their upper portions do not engage the armature 49 in the position at which the cams come into association with the low point on the cams, the levers will move toward the front portion of the machine and the slidable bars will be permitted to drop down in back of the cam levers for actuation by the cam levers when the cam levers are moved toward the rear of the machine due to engagement thereof by the relatively high portion of the cam associated with them to perform certain mechanical operations of the apparatus. As shown in Fig. 3, the slidable bars II3 to H9 normally rest on the shoulders of the cam levers I23 to I29, so that when a cam lever is permitted by the armature 46 to rotate clockwise, its associated slidable bar will drop off said shoulder onto the plate 2| 6 into position to be actuated leftwardly by the cam lever. At a predetermined instant in the cycle of operations, the slidable bars are again restored to their respective positions on the shoulders of the cam levers by the arm 280-A of the function determining bar 280, which is caused to be raised by the lever 299 (Figs. 5 and 6).

By reference to the timing chart shown in Fig. '7, it will be apparent that three of the cam levers are adapted to engage the low portion of their respective cams simultaneously; that is, the cam levers I23 and I28 associated with the type segment oscillating earns 95 and IIlI and the cam lever I29 associated with the code ,bar setting cam I02. As shown in Fig. 8A, the upper end of the camlever I23 associated with the type segment Oscillating cam 95 is out out so that, if a marking impulse is received, the lever I23 will be permitted to move forward when the low part of its cam is in association with it. Therefore, upon receipt of a marking pulse, when the low part of cam 95 is in alignment with lever I23, the slidable bar II 3 whose end adjacent the cam lever is normally resting on top of the cam lever I23, will be permitted to drop down in back of its associated cam lever I23 for actuation thereby when the high art of the cam engages the cam lever I23. If, however, a spacing impulse is received at the time when the cam levers I23, I28 and I29 are in association with the low portions of their associated cams 95, IIlI and I02,

the cam lever I23 will be blocked in moving forward and will not permit its associated slidable bar I I3 to drop behind it; whereas the cam lever I28 willmove forward due to the construction of its upper portion and the slidable bar II8 associated with it will drop behind it and will be actuated by it when the high portion of the cam IIlI engages the lever I28. It should be noted that the code bar seting cam I02 is operable at the same intervals that the type oscillating cams are operable and that the upper end of the cam lever I29 is so cut as to permit the slidable bar II9 to drop behind it upon receipt of a marking signal whereby the slidable bars H3 and H9 will be moved to the rear of the machine simultaneously if a marking signal is received at the time interval when they are in selectable position. The slidable bar II9 has code notches cut in its upper surface to effect a function selecting operation as will be described more in detail hereinafter.

The slidable bars H3 and H8 are normally urged into engagement with type segment oscillating levers I44 and I45, respectively (Figs. 1'

and 5), notches being formed in the type segment oscillating levers to receive the rounded extending rear end of the slidable bars H3 and H8. The springs which urge the slidable bars I I3 and H8 into the notches in the type segment oscillating levers I44 and I45 are relatively light and are designated I46, a series of these springs v being provided one for each of the separate slidable bars II3 to H9, inlcusive. The springs I 46 are not strong enough to move the levers with which the slidable bars are associated since the levers are all drawn toward the front of the machine by much stronger springs designated I41. The type segment oscillating levers I44 and I45 are pivoted on a pivot rod I48 mounted in a block I49 extending upwardly from the base member 3|. The upper extending ends of the type segment oscillating levers I44 and I45 are interconnected (Fig. 4) with a pair of slidable racks I50 and II, respectively, by springs I52 and I58, respectively, the springs I52 and I53 normally tending to hold shoulders I54 and I55 formed on the racks I50 and I5I against the levers I44 and I45,

.respectively. Slots are formed in the racks I50 tends upwardly from an irregularly shaped frame plate I60 which is in turn mounted on the upper end of the posts 10 and H and a pair of rear posts I6I (Fig. 5). The plate I60 also carries on its upepr surface a pair of short posts I62 and I63 and the posts I62 and I63 and the pin I51 serve to support a T-shaped plate I64 (Figs. 1 and 3) in which the guide pin I56 is mounted.

From the foregoing it is apparent that, if either the slidable bar H3 or the slidable bar H8 is selected for operation, that is, if its associated cam lever I23 or I28 is permitted to move into engagement with the lower portion of its associated cam 95 or IOI, respectively, the slidable bar H3 or II8 will drop in back of its lever I23 or I28, respectively, and will be rocked toward the rear of the apparatus upon the movement of the high part of the cam into association with the cam lever. Whichever one of the slidable bars H3 or H8 is selected for operation, will move toward the rear of the machine and in so doing will force the lever I44 or I45, whichever one happens to be associated with it, toward the rear of the machine, thereby urging the associated rack I50 or I5I to move toward the rear of the machine thus tending to rotate the gear I58 in either a clockwise or counterclockwise direction as viewed in Fig. 1. Thus the selection of one type segment oscillating lever I44 or the other type segment oscillating lever I45 for operation will bias the gear I58 to rotate in one direction or the other to carry with it a type seg ment I65 as will be described more in detail hereinafter in connection with the further description of the mechanism operated from the cam shaft under control of the armature 49.

The next cam on the cam shaft, that is, the type segment elevator stop cam 96, has associated with it the slidable bar I I4 and cam lever I24 and serves to control the height to which the type segment I65 will be raised to select a row of type thereon for printing. As most clearly seen in Figs. 3 and 5, the slidable bar II4 extends an appreciable distance beyond the rear end of the slidable bar H3 and has a slot I10 formed in its rear end as shown in Fig. 8. A pin "I (Fig. 8) fixed in one arm of a U-shaped lever I12 by means of a nut I13 engages in the slot I10 so that when the slidable bar II4 is moved toward the rear of the machine the U-shaped lever I12 will be rocked about its pivot rod I14 which is in turn mounted in a pair of posts I15 and I16 extending upwardly from the base plate-3L, The other arm of the U-shaped lever I12 has a shoulder I11 formed on it for engaging an enlarged por tion I18 of a slidable shaft I19 (Fig. 3) on the upper end of which the type segment I65 is fixed when the lever I12 is held in its clockwise position by its spring I41. The shaft I19 is slidably keyed in th gear I58 and thus will rotate with it but may be moved axially of it. Thus when the slidable bar II4 is selected for operation and moved toward the rear of the machine, upon engagement of the high part of the cam 96 with the lever I24, the shoulder I11 will be moved out of the path of the enlarged portion I18 of the shaft I19 to permit the type segment I65 to be elevated to a position which will raise the enlarged portion I18 above the shoulder I11.

A second U-shaped lever I similar to the U- shaped lever I12 is provided for actuation by the slidable bar II1 upon the selection of the slidable bar II1 for actuation by the cam lever I21 which is in turn selected under control of the armature 49 and which is driven by the type segment elevator stop cam I00. The left arm (Fig. 8) of the U-shaped lever I80 has a shoulder I8I formed on it which limits the amount of movement of the type segment by engaging the enlarged portion I18 of the shaft I19 when the slidable bar I I1 is not selected for actuation and moved counterclockwise against the tension of its spring I41. Also pivoted on the pivot rod I14 and held in place between the adjacent arms of the U-shaped lever I12 and I80 is a lever I 82 having shoulders I83 and I84 formed thereon for engaging the enlarged portion I18 of the shaft I19 to determine the amount that the type segment is elevated in any cycle of operation. The lever I82 has no slidable bar individual to it, but is provided with a spring I41 for normally urging it to rock toward the front of the apparatus as are the u-shaped levers I12 and I80. The lever I82 is actuated, however, whenever either the lever I12 or I80 is operated to move toward the rear of the machine due to the fact that it has a member I85 extending through it and into the path of the adjacent arms of the U-shaped levers I12 and I80.

With the just described construction the' selection of either one of the slidable bars II4 or II1 for operation and their subsequent movement toward the rear of the apparatus will result in the U-shaped element I12 or I80 associated with the selected slidable bar being moved toward the rear of the machine and consequently the lever I62 will also be rocked toward the rear of the machine. Upon reference to Fig. 8, it will be noted that the shoulder I84 is the lowest one of the shoulders I11, I8I, I83 and I84 and consequently when either of the levers I12 or I 80 is actuated the shoulder I84 will be moved out of the path of the enlarged portion I18 of the shaft I19 to permit the shaft I 19 to carry the type segment up until the enlarged portion I18 engages theshoulder on the U-shaped lever which was not actuated. If neither of the U-shaped levers I12 or I80 is selected for actuation, then the enlarged portion I18 of shaft I19 will engage the shoulder I84 whereas if either of the levers I12 or I80 is actuated the type segment will be elevated until the enlarged portion I18 engages the shoulder on the lever which has not been actuated.

Thus it will be apparent that the selection of the height to which the type segment is elevated is controlled by the levers I12 and I80. In other words, the distance that the type segment is elevated is determined by the selecting of the various shoulders for stopping the movement of the type segment upwardly and if a signal is received which does not result in either the U-shaped lever ward the rear of the machine, the lever I82 will be carried with it and the enlarged portion I18 on the shaft I19 will engage the shoulder I9I; whereas if both levers I12 and I89 are moved toward the rear of the machine, the shoulder I83 which is always in the path of the enlarged portion I18 will serve as an abutment against which the enlarged portion I18 will move, thereby to carry the type segment I65 to its highest .position and bring the bottom row of type thereon into alignment with the print hammer which will be described more in detail hereinafter. It should be noted that the type segment I66 in each cycle moves down below printing position to render the last typed character visible and that it moves up in each cycle until stopped by the engagement of enlarged portion I18 with one of the shoulders.

The next cam on the. cam shaft, that is, the segmental stop actuating cam 91, has associated with it the cam lever I25 which under control of the armature 49 will select the slidable bar II associated with it when the signal received at the time when the low portion of the cam 91 is in association with the cam lever I25, is a marking signal. The receipt of a marking impulse at this time in the cycle of the apparatus will permit the lever I25 to move forwardly of the apparatus and will thereby permit the slidable bar II5 to drop in back of the lever I25 so that, when the high portion of the cam 91 engages the cam lever I25, the cam lever will push the slidable bar II5 to the rear of the machine. The rear end of the slidabie bar H5 nests in a notch formed in a lever I9I. This lever I9I (Figs. 3 and 4) extends upwardly and engages an extending portion I92 formed on a segmental stop member I93 which together with a pair of similar segmental stop members I94 and I95 is supported upon a stop supporting plate I99. The stop supporting plate I96 is mounted upon the upper frame plate I69 and is oscillatable about a guide sleeve I91 in which the shaft I19 is slidable and about which the gear I58 is rotatable. The stop supporting plate carries a pin I99 at its rear end which engages in slots in the rear ends of the segmental stop members I93, I94 and I95 and cooperates with the bearing sleeve or guide sleeve I91 to guide the segmental stop members in their movement toward the rear of the machine. The stop supporting plate I96 is shiftable by mechanisms to be described hereinafter to rock it about the guide sleeve I91, a pin I99 being fixed in the upper frame plate I69 and engaging one or the other edges of a U-shaped notch formed or cut in the rear end of the segmental stop plate I96 to set the stop supporting plate I96 in either of its adjusted positions. The segmental stop members I93, I94 and I95 are of substantially the same configuration as far as their profiles are concerned but it will be noted that each of them has shoulders formed on it, which as most clearly shown in Fig. 4, serve as abutments against any of which the depending portion of arm 299, fixed to gear I58, will engage when the segmental stop members are shifted. The racks I 59 and I5I, depending upon the direction in which they are moved, will determine which side of the segmental stop members will be efiective to stop the depending portion of arm 299. The bottom segmental stop member I95 has a'projection 29I formed on it which extends inwardly toward the center or open portion of the stop member and this projection 29I has a pin 292 fixed to it so that when either one of the other segmental stop members I93 or I94 are shifted toward the rear of the apparatus, segmental stop member I95 will becarried with them. The segmental stop member I94 is adapted to be actuated by a lever 293 similar to the lever I9I and the lever 293 may be shifted toward the rear of the apparatus by the slidable bar II6 which is similar to the siidable bar II5.

From the foregoing it is believed to be apparent that the segmental stop members may be shifted in a manner similar to the shifting of the levers which block the movements of the type segment upwardly, the segmental stop members to be moved out of the path of the depending portion of arm 299 being determined by the position of the armature 49 at the time when the associated lever is engaging the low point of the cam associated with it. Specifically, the distance which the springs I52 and I53 will be permitted to move the type segment in its oscillating movement will be determined by the position of the segmental stop members which are positioned selectively in accordance with the received code signals. If the segmental stop member I93 is shifted toward the rear of the machine, the segmental stop member I94 will have its shoulders in the path of the depending portion of arm 299 and the shoulders formed on the inner surface of the segmental stop I95 will be moved out of the path of the depending portion of arm 299 due to movement of the segmental stop member I95 under the action of the pin 292 and V the movement of the segmental stop member I93.

In other words, the segmental stop member I93 will carry the segmental stop member I95 with it. Similarly, if the segmental stop I94 is moved toward the rear of the machine, then the depending portion of arm 299 will be permitted to move until it engages the shoulder on the segmental stop I93 due to the fact that the segmental stop member I95 will be moved with the segmental member I94. If both the segmental stop members I93 and I94 are moved toward the rear of the machine they will carry the segmental stop member I95 with them and the depending portion of arm 299 will be able to move in either direction, depending upon which of the springs I52 or I53 is under tension, until the depending portion of arm 299 strikes the edge of all the segmental stop members, all the shoulders having been moved out of the path of the depending portion of arm 299. If a signal is received, which does not result in either the segmental stop members I94 or I93 being moved toward the rear of the apparatus, then the shoulders on the segmental stop members I95 will limit the amount of movement of the type segments in both directions and the type segment will be moved by the spring I52 or I53 that is under tension against the shoulders on the segmental stop member I95.

As described hereinbefore. the particular area of the type segment to be presented in printing position is chosen by limiting the amount of movement of the type segment in its oscillation and in its elevation. This selection of the area of the type segment I65 to be presented in printing position is determined by the code impulses received by the selecting magnet mechanism and the position of the armature 46 at the time when the particular cams on the cam shaft 19 are in predetermined position as explained hereinbefore. Movements of the type segment in oscillating are also selectively determined in accordance with the received signal as described hereinbefore. How-