US2436126A - Apparatus for recording or transmitting intelligence - Google Patents

Description

Feb. 17, 1948.

APPARATUS FOR RECORDING 0R TRANSMITTING INTELLIGENQE H. L. THCLSTRUP Filed June 30, 1943 SPACE O0 OO O O 00 11 Sheets-Sheet 1 zgl coc oo 0 0 C 0 O 0 00 O 0 0 000 0 00 O Q o O O 0 00 0 000 E R T V U l 0 P S D 6 H J K L Ill TCH

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A BCDEFG H l J KL MRO PQRSTUVHX YZ abcdlfgiijlrlmnopqrstuvwxs) INVENTOR 967W ATTORNEY STOP Fun/[z 203 TAP! FIID "Dim Feb. 17, 1948. H. L. THOLSTRUP APPARATUS FOR RECORDING 0R TRANSMITTING INTELLIGENCE Filed Juge 30, 1943 11 Sheets-Sheet 2 INVENTOR 06 0 Y mwm M E) h @F 3 w o f n "n \m q 1 mvm Wm A w R I do 6 MW QM S Q mm gm Q L o m Wk QR o N mm m 3 Q Q om mm h o w M N\ 0 w m R m S Q &. R m m mm Q Q mm WW & Q o 7 r (9 a d w wm mm Mm QQ N O u Feb. 17, 1948. H. L. THOLSTRUP 2.436.

APPARATUS FOR RECORDING 0H TRANSMITTING INTELLIGENCE Filed June 30, ,1943 11 Sheets-Sheet 3 INVEN R ATTORNEY 11 Sheets5heet 4 H. L. THOLSTRUP Filed June 30, 1943 III APPARATUS FOR RECORDING OR TRANSMITTING INTELLIGENCE 5 w 52 M l 8w 9% 434. .3 1 mmm wmm XL Feb. 17, 1948.

A'ILTORNEY Feb. 17, 1948. H. L. THOLSTRUP APPARATUS FOR RECORDING OR TRANSMITTING INTELLIGENCE Filed June 30, 1943 11 Sheets-Sheet 5 2 W 3% 8 \AQ wk m mm m I my ma/gw \& m @Q n g lNnYENTOR ATTORNEY Feb. 17, 1948. H. THOLSTRUP 2.436.126

APPARATUS FOR RECORDING OR TRANSHITTiNG INTELLIGENCE Filed June 30', 1943 11 Sheets-Shut 6 FIG. 8.

FIG. 9.

ATTORNEY Feb. 17, 1948. o sT u 2,436,126

APPARATUS FOR RECORDING OR TRANSMITTING INTELLIGENCE Filed June 250, 1943 ll Sheets-Sheet 7 222 1 220 2 I I FIG. 14. 6 235 2a 190 125 237 24 192 FIG. 12 2/3 I70 I72 2 a ATTORNEY Feb. 17 1948.

H. L. THOLSTRUP APPARATUS FOR RECORDING OR TRANSMITTING INTELLIGENCE Filed June 30, 1943 FIG. 11.

ll Sheets-Sheet 8 ilillllllll II!!! l Tlgmuig @gvEgToR I AT'i'oRNEY Feb. 17, 1948. H. THOLSTRUP 2.436.1 6

APPARATUS FOR RECORDING OR TRANSMITTING INTELLIGENCE Filed June 30, 1945 ll Sheets-Sheet 9 INVENTOR O n A Feb. 17, 1948. L THOLSTRUP 2,436,126

APPARATUS FOR RECORDING OR TRANSMITTING INTELLIGENCE Filed June 30, 1943 11 Sheets-Sheet 10 AfToRNEY Feb. 17, 1948. H. L. THOLSTRUP APPARATUS FOB. RECORDING OR TRANSMITTING INTELLIGENCE Filed June 30, 1943 11 Sheets-Sheet 11 ATTORNEY Patented Feb. 17, 1948 APPARATUS FOR RECORDING OR TRAN S- MITTING INTELLIGENCE Henry L. Tholstrup, Rochester, N. Y., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application June 30, 1943, Serial No. 492,895

20 Claims. 1

This invention considered in its broader aspects. relates generally to apparatus for recording or transmitting intelligence, and it has for a broad object to provide apparatus of this type which is of improved construction and arrangement of parts.

A further and more specific object is to provide a new and improved form of typewriterrecorder apparatus wherein, in response to the actuation of each typewriter key, a code designation representing the key actuated is recorded in a record strip.

A further object is to provide in an apparatus for recording data on a record strip, a new and improved means for nullifying previously recorded data.

A further object is to provide in a typewriterrecorder apparatus a new and improved means which operates under the control of the back space key of the typewriter to nullify data previously recorded in a record strip and which also feeds the record strip backward while back spacing the typewriter carriage.

A further object is to provide in a recording apparatus, a new and improved means for feeding a record strip.

A further object is to provide in apparatus of the character first stated, a new and improved means which, in response to a single actuator in one condition of adjustment, provides for the transmitting of a certain selected data and when in another condition of adjustment transmits other selected data.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose. by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. l is a plan view showing, as one preferred embodiment of this invention, a typewriter-recorder apparatus;

Fig. 2 is an enlarged vertical sectional view taken on the line 22 of Fig. 1; and illustrating a power-operated typewriter as controlling a permutation unit in response to the actuation of the typewriter keys;

Fig. 2a is a fragmentary vertical sectional view of a portion of the typewriter and illustrating partly the mechanism controlled by the back space key:

Fig. 3 is an enlarged fragmentary vertical section of the typewriter shown in Figs. 1 and 2, and illustrating the mechanism for shifting to upper and lower case. and the means for controlling the operation of the permutation unit when shifting to upper case and when the shift key is released to return to lower case;

Fig. 3a is a detail sectional view taken on the line 3a-3a of Fig. 3;

Fig. 4 is a fragmentary plan showing the operation of the shift keys, the shift-lock button or key, and the means for releasing the shift key when locked;

Fig. 5 is an enlarged fragmentary sectional view through the lower part of the typewriter and showing the permutation unit in bottom plan. the plane of the section being indicated by the line 55 on Fig. 2;

Fig. 6 is a fragmentary vertical sectional view taken on the line 5-6 of Fig. 5;

Fig. 7 is an enlarged fragmentary plan section of the code recorder shown in Fig. 1, the plane of the section being indicated by the line 1-4 of Fig. 8;

Fig. 8 is a fragmentary vertical section showing the punch elements of the recorder, the section being indicated on the line 8-8 of Fig. 7;

Fig. 9 is a fragmentary vertical section taken on the broken line 9-9 of Fig. '7 and showing the relative arrangement of the latch levers for controlling the operation of the punch actuating levers of the recorder:

Fig. 10 is an enlarged fragmentary plan section showing the detail construction of the mechanism for punching the feed holes in the tape, the plane of the section being indicated by the line Ill-40 of Fig. 9;

Fig. 11 is a fragmentary plan section through the tape punch at a higher plane than Fig. '7 and showing the drive mechanism and the clutch, which operate the punch elements and the tape feeding mechanism, the plane of the section being indicated by the line iI-Il of Fig. 8;

Fig. 12 is an enlarged detail section taken on the line l2l2 of Fig. 11 and showing the clutch and a portion of the clutch magnet;

Fig. 13 is an enlarged fragmentary bottom plan view and showing the mechanism for feeding the tape and for restoring and resetting'the several armatures, latch levers, etc., the parts being shown in the position they occupy at the end, or high point, of a feed stroke of the advancing pawl;

Fig. 14 is a fragmentary sectional view taken on the line |4-|4 of Fig. 13;

Fig. 15 is a fragmentary sectional view taken on the line l5|5 of Fig. 13, the view having been transposed approximately 90 counterclockwise from the position it would normally occupy on the sheet so as to facilitate comparison with Fig. 14:

Fig. 16 is a fragmentary bottom plan showing the tape feeding mechanism with the bottom guide plates for the feed pawls removed to show the construction and operation more clearly, the parts being shown in the home position, i. e., the position they occupy between tape feeding strokes:

Fig. 1'? is a wiring diagram illustrating the operation of the various component parts or the illustrated preferred embodiment: and

Fig. 18 is a view illustrating a portion of a record tape having punched therein, all of the code hole designations of .a preselected combinational code.

For the purposes of description, the illustrated embodiment of the invention may be considered generally as comprising a typewriter I having the usual character and functional keys; a code recorder in the form of a tape punch 200 having punching elements corresponding in number to the positions of a preselected comblnational hole code and also having a feed hole punching element; and a permutation unit 300 including a plurality of longitudinally movable bars or slides also of the same number as the code positions and controlling, respectively, the operation of the punching elements.

When the typewriter keys are operated in the usual manner to effect typing on a record sheet and to control the necessary functional operations of the typewriter, they also provide for the selective movement of the permutation slides to control the operation of their respective punching elements to punch code hole designations in the tape which, in each instance, represents the particular character or function of the key actuated.

Tape feeding mechanism is also provided and may, or may not, be considered as a part of the tape punch. The tape feeding mechanism provides for spacing the tape for each recording operation and may include a means for adjusting the feed so that the tape may be fed either forward or backward at the will of the operator. Normally, the tape is fed forward for each operation of a typewriter key and for the corresponding operation of the tape punch. However, as will appear more fully hereinafter, under certain conditions, such for example as when it is desired to nullify a previously recorded code hole designation, the tape feed may be adjusted to feed the tape backward for each nullifying operation.

Insofar as certain of the broader aspects of the present invention are concerned, the typewriter i00 may be of any desired construction. However, in the illustrated embodiment of the invention there is included a commercially known form of power-driven typewriter, the principles of which are fully disclosed in a number of United States patents, among which is Patent No. 1,777,055, granted September 30, 1930, which discloses the general principles of operation of the key levers and how they control through related cam units the operation of the type bars. In view of the detail description of the structure and operation of the parts given in the patent Just identified, only a brief description will be given herein which will be sufflcient to enable the present invention to be understood. Reference may be made to for further details.

The typewriter is the aforementioned patent disclosed herein in Figs. 1, 2, 2a, 3, 3a, and 4. The numeral ill designates the usual character keys which are mounted on key levers Ii, the latter being pivoted on a rod I! which is supported by a cross frame ll rigidly mounted in the base i4. Rotatably mounted in the base I4 is the power roller i0 which is rotated in the direction of the arrow (Fig. 2) by means of an electric motor, not shown in Fig. 2, but indicated diagrammatically as llli in Fig. 1'7. When the machine is in use, the power roller l0 rotates continually,

Cooperating with the power roller it are the cam units It which are plvotally mounted on rods ll extending parallel with the power roller II. There is a cam unit l8 associated with each of the key levers Ii, and each of the cam units which is operated by a character key N, is connccted by a link I8 with a sub-lever is pivoted on rod i2. The sub-levers it are connected by links 20 to type bars 2| through the medium of toggles 22. The type bars II are pivoted in the usual type bar segment 23 and the latter is provided with a type guide 24 located in front of the platen 15. As is customary, the platen is adapted to support a work sheet and is rotatably mounted in the carriage 26, and the latter is supported for lengthwise movement on front and rear rails 21 and 28, respectively, by means of suitable antidriction roller trucks. Springs 29 connected to a curved spring anchoring member 30 and to toggles 22, provide means for locking the toggles in their normal or inactive position shown in Fig. 2,

When am! character key III is depressed, its related cam unit i6 is caused to operatlvely engage the power roller i5 in a well known way, thereby rocking the cam unit II clockwise or counterclockwise, according to whether the operative cam unit is pivoted on the left hand or right hand rod II, respectively, as viewed in Fig. 2. The rocking of the cam unit causes its link I8 to be drawn downwardly, thereby rocking the corresponding sub-lever is in a clockwise direction. This movement of the sub-lever I9, through the corresponding link 20 and toggle 22, causes the type bar associated with the selected key to rock in a counterclockwise direction to effect the impression of the type upon the work sheet wrapped around the platen 25. The type bar, near the end of its operating stroke, engages the usual universal bar 3i and causes the universal bar to move rearwardly and downwardly in Fig. 2 to space the carriage forward in a manner not disclosed in detail herein, but which is well known to those skilled in the art.

The segment. is mounted in a frame 32 which forms part of the type basket. The type basket is movably mounted in the framework of the machine for case shifting movement in a well known way and normally occupies an elevated position shown in Figs. 2 and 3 for the typing of the lower case characters. The shift mechanism for drawing the type basket 32 downwardly to permit the printing of upper case characters is described in United States Patent No. 1,945,097, granted January 30, 1934, and is partly shown in Fig. 3.

Secured, respectively, to the back of the type basket frame 32 and on opposite sides thereof, are two brackets 33. The brackets 33 are connected by links 34 to the outer ends of lever arms 85, the latter being fixed, respectively, on

the ends of a transverse shaft 55 lournaled in the framework of the machine. Pivoted on a stud 31 at one side of the machine is a lever 55 having two pins 55a. 55b. engageable by the short arms of a T-shaped lever 59 which is pivotally mounted at 45 on one arm of a threearmed lever 4|. The lever 55 is connected by a link 42 to the outer portions of one of the lever arms 55 and at points spacedfrom the connection of such arm 55 and its link 34. The T-lever 55 has a stud 43 projecting into a slot formed in an arm 44 comprising an extension of the left-hand shift key lever 45 as viewed in Figs. 1 and 4. One arm of lever 4| is connected by a link 45 to a cam unit 41 which is controlled by the shift key lever 45 in substantially the same manner as cam units i5 are controlled by the key levers I, described above.

The type basket is shifted downward to upper case position when the shift key 55 mounted on key lever 45 is depressed, and is returned t lower case position when the key is released. It is, therefore, customary to hold the key depressed, either by hand Or by a shift lock, while writing upper case characters.

When the shift key lever 45 is depressed, the T-lever 35 is elevated to bring one of the short arms thereof to a position to the left of the pin 35a, this movement taking place before the cam unit 41 controlled by the shift key 55 is operatively connected to the power roller l5. When the cam unit controlled by the shift key is operated, the link 45 is drawn downwardly thereby rocking lever 4| in a clockwise direction. This draws the T-lever 35 to the right in Fig. 3, thereby, through the engagement of said T-lever with the pin 35a, rocking the lever 35 clockwise. Through the link connection 42, the levers 35 connected thereto and the shaft 35 are rocked in a counterclockwise direction, thereby pulling downward the links 34 which result in the type basket being drawn downward to upper case position.

As disclosed fully in the aforementioned U. S.

Patent No. 1,945,091, when the key 50 is released so that it is returned upward to its normal posi tion by the spring 45, the cam unit 41 is again actuated by the power roller l5 so that the cam unit rocks in a counterclockwise direction, as before. When the key 55 is released and before the cam unit 41 is actuated, the arm 44 of the lever 45 moves downward and thereby permits the T-lever 39 to move downward to bring the lower of its short arms to a position to the left of the lower pins 35b. Consequently, when the cam unit 41 is rocked counterclockwise as Just stated, the cam unit 41 through the link 45, rocks the lever 4| clockwise; and the lever 4| through the T-lever 35 and pin 55b, rocks the lever 58 counterclockwise; and, the latter through the link 42, rocks the arms 35 and shaft 35 clockwise to return through the links 34. the type basket to the lower case position shown in Figs. 2 and 3.

As stated previously, a keylock is provided for holding the key lever 45 down when it is desired to type a substantial number of capital or upper case characters. In the illustrated embodimentan improved form of keylock and shift release is disclosed (see Figs. 3, 3a, and 4). The keylock comprises a shift latching lever 5| and a lock down button 52 arranged on opposit sides of the lever 45 and provided, respectively, with vertical slots 53 and 54, receiving opposite ends of a stud 55 secured within an opening in the lever 45. A detent 55 is fixed to a stationary portion 51 of the typewriter frame and cooperates with the lever II in locking the key lever 45 down in shifted position. The arts are shown in their normal lower case position in Fig. 3. with the detent 55 engaging the lowermost inner surface of the lever 5|. A tension spring 55 connects the latch lever 5| with the shift key lever 45 and serves to hold the lever 5| in this position, the stud 55 extending from the lever 45 occupying the lower part of the slot 55. The lock down button 52 is provided with a pin 5| which extends over the lever 45 and engages the top of latching lever 5|. As shown in Fig. 3a with the parts in normal position, the lever 5| supports the button 52 through the pin 5| and the stud 55 also occupies the lower part of the slot 54 in the button 52. The button 52 is also provided wtih spaced tabs 52 and 53, engaging, respectively, the upper and lower sides of the lever 45 which aid in holding the button 52 in an upright position. When the button 52 is depressed it moves the latching lever 5| down ward by means of the pin 5| until the top of the slot 53 in lever 5| engages the stud 55 on lever 45 and then the lever 45 will move down with the lever 5| a distance suflicient to actuate the cam unit 41. When the latter occurs, the detent 55 will hav cleared a ledge portion 55 on the lever 5| and the spring 50 will then move the lever 5| to the right or counterclockwise as viewed in Fig. 3, until the ledge 55 is under the detent 55, thus locking the latch lever 5| down and also holding the key lever 45 down in its shifted position because of the engagement of the top of slot 53 with the stud 55.

The shift lock is released by depressing the right-hand shift key 55, as viewed in Figs. 1 and 4. To this end, a bail lever 51 is provided which comprises a pair of end plates 55 and 55 connected by a bail rod 15. The bail lever 51 is mounted for pivotal movement by studs 1| and 12 extending outwardly from the plates 55 and 59 and journaied, respectively, within opposite sides oi the typewriter frame. A stud 15 extends inwardly from the end plate 55 and within a notch 14 formed in a downwardly extending projection of key lever 15 on which the key 55 is mounted (see Fi 2). A second stud 15 extends inwardly from the end plate 55 and over the outer end 11 of latching lever 5|. Thus, upon depressing the key 55 and lever 15 the bail lever 51 is rocked about its pivotal support and the stud 15 engages the end 11 of latching lever 5| and thereby rocks the latter downward to move the ledge portion 55 out from under the detent 55 which unlatches the lever 5|. When the lever 5| is thus released, the lever 45 is permitted to move up under the force of its spring 48 to the normal lower case position shown in Fig. 3.

It is noted that the stud 15 also extends over a downwardly projecting hook portion 55 formed on the lower part of lever 45. This construction permits the actuation of lever 45 and the cam unit 41 by the key 55 and lever 15, through the bail lever 51. It is, therefore, noted that the depression of either key lever 45 directly, or through the key 15 and hail lever 51, results in sufficient movement of lever 45 to actuate the cam unit 41; but such movement of lever 45 is not enough to effect latching engagement of the lever 5| and detent 55. Thus, the cam unit 41 can be operated to shift the type basket to upper case position and operated to return the type basket to lower case by the depressing and releasing of either key 55 or 55; but, it it is desired to lock down the shift key lever 45, the button 52 must be depressed. The shift lever 45 is unlatched by depressing the key 85 in the manner previously explained.

From an examination of Fig. 20, it is noted that the depression of the back space key 32 results in the operation of a cam unit 83, which is the same in construction and operation as the cam unit IB shown in Fig. 2 at the left, or at the rear, of the power roller I5. When the cam unit 83 operates, it pulls down a link 34 which is pivoted to one end of a rock lever 85 pivotally supported by the rod I2. The other end of rock lever 85 is pivoted to a link 86 and each time the lever 85 is rocked clockwise, as viewed in Fig, 2a, by the operation of the cam unit 83 and link 34, the link Illl operates the usual mechanism (not shown) for back spacing the carriage provided in power-driven typewriters of the type disclosed. The detail construction and operation of the back spacing mechanism has not been shown as it is well known to those skilled in this art. If desired, reference may be had to U. 8. Patent No. 1,873,553, granted August 23, 1932, which contains a full disclosure of the back spacing mechanism. The link 86 referred to above, is the same as the link I8 01' the patent.

The other functional keys on the typewriter shown in the illustrated embodiment are the tab key 83, the carriage return key 90, and the space key or bar M. The depression of either of these functional keys results in the actuation of a related cam unit similar to the units I3 previuosly described, and in the operation by the related cam unit through suitable lever linkage, etc., of the typewriter to perform the function corresponding to the key actuated. The particular manner in which each of the typewriter functions corresponding to the keys 39, 30 and 9| is performed in the particular typewriter disclosed, is well known by those skilled in this art and a detail showing and description thereof is believed to be superfious. A full and detailed disclosure of how the actuation of the tab key 33 effects tabulation operations of the carriage is disclosed in U. S. Patent No. 1,935,436, granted November 14, 1933. A detail disclosure of the means for effecting the return of the carriage by depressing the carriage return key 90 is fully disclosed in U. S. Patent No. 2,104,559, granted January 4, 1938. A detail disclosure of the manner in which the carriage is spaced as a result of depressing the space bar or key Si is found in a number of granted patents, among which is U. S. Patent No. 1,945,847, granted February 6, 1934.

Referring now to Fig. 18, it is noted that there is shown a portion of a record strip or tape 35, in which is punched all of the code hole designations of a combinational six-hole code which has been selected for use in illustrating one application of the present invention. It will be readily understood that the apparatus disclosed may be modified to record data designations in a wide variety of ways. Furthermore, any code may be devised which will suit the desires of the particular designer and the particular problem to which the apparatus is to be applied. For example, the code selected may have a greater or lesser number of code positions than the one shown, and the code designations representing the various characters and functions may be changed, if desired.

In order that the particular code which has been selected will be readily understood the six code positions are indicated in Fig. 18 by the reference numerals 1, i 3, 4. 5, and 8, respectively. Also, below the bottom edge of the tape 35 and opposite each field, or vertical column in the tape, there appears the particular typewriter character or function which is represented by the code designation punched in such field. The tape feed holes are indicated at 98 and are disposed between code positions 2 and 3,

Before considering in detail the permutation unit 300 and the means for actuating the unit by the type riter keys, it is thought best to describe the construction and operation of the code recorder which, as stated above, is shown herein as being in the form of the tape punch 200. The tape punch 20B is disclosed in Figs. '7, 8, 9. 10, 11, and i2, and comprises six recording punch elements RPI, RP2, RP3, RP4, RPS, and RPS, corresponding, respectively, to code positions 1, 2. 3, 4, 5, and 6 of the tape 95, and also comprises one feed hole punch element FP. As shown in Fig. 8, the punch elements are arranged in vertical alignment and are respectively mounted to reciprocate within horizontal guide passages formed in a guide block III] and into aligned die openings in a die plate III. The die plate III is machined to provide a slot in the face thereof which is adjacent the member H0, through which the tape as is fed horizontally p t the p n hin elements in a manner which will be described hereinafter. The recording punch elements are arranged in the same relative positions as the code positions shown in Fig. 18, i. e., with the element RPB at the top and the elements RPI, RP2, RP3, RP4. and R1 5 in order therebelow. The feed punch element FP punches a smaller hole than the recording punch elements and is disposed between elements RP2 and RP3.

Each punch element i held in its normal or retracted position, the position shown in Fig. 8, by a tension spring H4, and as will presently appear, is moved from the position shown toward the left to perforate code designations in the tape, by a punch actuating lever. There are seven punch actuating levers indicated, respectively, by the reference characters I20, I2I, I22, I23, I24, I25, and I26, (see also Figs. "I, 9, and 10). The lever I20 operates the element FF, and the levers I2I to I28, inclusive, operate respectively. the elements RPI to RPB, inclusive. Each actuating lever has an outer end portion I30 which fits within a slot I3I in its related punch element and is rotatably mounted intermediate its ends on an eccentric portion I32 of a cyclically operated drive shaft I33 which, as will presently appear, is rotated one complete revolution for each recording operation. In order for an actuating lever to operate its related punch element, the opposite end I34 thereof is latched and held against a fixed abutment I 36, by a hooked end I35 of a related L-shaped latch lever.

There are also seven L-shaped latch levers I40, I, I42, I43, I44, I45 and I46 which function to latch the ends I34 of the punch actuating levers I20, I2I, I22, I23, I24, I25, and I26, respectively. When the end I34 of an actuating lever is latched by the hooked end I35 of a related L-shaped latch lever, a rotation of the shaft I33 and eccentric I32 will rock such actuating lever about its latched end as a fulcrum and thereby move its other end I30 downward as viewed in Fig. 7, or to the left as viewed in Fig. 8, and as a result, its end I30 will move its related punch element to perforate the tape in the corresponding position therein. When the end I34 of any actuating lever is not latched, the spring II4 connected to its related punch element will hold its end I30 in the normal inactive position shown in the drawings, and the rotation of the shaft I33 will then only cause its other end I34 to move downward, as viewed in Fig. 7.

All of the L-shaped latch levers are rotatably supported on a shaft I41 and each latch lever is constantly urged by a tension spring I46 to move its end I35 clockwise, as viewed in Fig. '1, and into latching engagement with its related punch actuating lever.

During each recording operation, the end I35 of latch lever I40 is held by its spring I46 in latching engagement with the end I34 of its related punch actuating lever I20 (see Fig. Thus, each time the shaft I33 is rotated, the feed punch FP will be actuated to punch a feed hole 96 in the tape.

The hooked ends I35 of remaining latch levers I to I46, inclusive, are normally held out of latching engagement with their related punch actuating levers IZI to I26, inclusive, due to the latching engagement of their other ends I49 with related pivoted latching armatures I50. Six latching armatures I50 are provided, one for each of the latch levers I to I46, inclusive, and the armatures cooperate, respectively, with six tripping magnets RMI, RM2, RM3, RM4, RM5, and RM6, to control the operation of their related L-shaped latch levers. As will be explained more fully hereinafter, the tripping magnets are respectively energized by the selective closing of related contacts in the permutation unit 300 and under the control of the tynewriter k y The parts are shown in the home position which is the position they occupy at the beginning of a cycle of operation of the recorder. In the home position, each latching armature I50 is in latching engagement with the end I49 of its related L-shaped lever and thereby serves to hold such related latch lever against the force of its spring I46. When any tripping magnet is energized, its armature I50 is attracted and thereby releases the end I49 of its related L-shaped lever, and the spring I46 connected thereto moves the end I35 thereof into latching engagement with the end I34 of its related punch actuating lever; and, as previousl described, when the shaft I33 is later rotated, the related punch lever will be actuated to punch a code hole in the corresponding code position in the tape 95.

When any one of the tripping magnets is energized to release its related latch lever in the manner just explained, such latch lever, in moving under the force of its spring I46 to latch its punch actuating lever, also engages and moves a contact-actuating bail I55, common to all levers III to I46, inclusive, and so that the bail I55 closes a pair of normally open spring contacts I56. The bail I55 is rotatably mounted on the shaft I41 and is moved clockwise, as viewed in Fig. '1, to close the contacts I56. The latch lever I40 which controls the operation of the feed hole punch FP is formed with a. notch I51 at points adjacent the bail I55 so that the lever I40 will have no effect on the operation of the ball.

The closure of the contacts I56 in the manner just explained, initiates a cycle of operation of the recorder by energizing a clutchmagnet CLM to effect engagement of a clutch I59, and thereby connect for one revolution, a constantly rotating power shaft I66 with a, second shaft IN, the latter being permanently connected through worm gearing I62 with the drive shaft I33 (see Figs. 11 and 12). At the end of each revolution, the clutch I69 is automatically disengaged and the shaft I6I and drive shaft I33 held in the home position, which, as stated, is the position of the parts shown in Figs. '1 to 12, inclusive. The power shaft I60 is driven by a belt I63 from the recorder motor I64 which is continuously operated while the apparatus is in use (see Fig. 1).

The clutch I59 may be of any desired construction. The type of clutch shown in the drawings is well known to those skilled In this art and consequently. only a general description of the clutch will be given. For a more complete description of this type of clutch, attention is directed to U. S. Patent No. 2,206,646. granted July 2, 1940. As shown in Figs. 11 and 12 hereof, the clutch I59 comprises a clutch barrel I66 fixed to the shaft IN and having a diametrically disposed groove receiving a sliding pawl I61 which carries a clutch tooth I66 at its outer end. A spring I69 in the barrel I66, constantly urges the pawl I61 and tooth I66 to move radially inward to effect clutching engagement of the tooth I66 with a toothed clutch disk I10 fixed to the power shaft I60. A clutch disengaging lever I1I is mounted for limited pivotal movement within the barrel I66 and operatively engages the pawl I61 so that when the outer protruding end I12 of the lever "I is intercepted and held by the outer end of an arm I13 which forms a part of the magnet armature I14, the lever I1I moves the pawl I61 radially outward against the spring I69 to disengage the tooth I68 from disk I10. when the armature arm I13 is moved to release the lever ill, the spring I59 moves the pawl I61 inward to efiect clutching engagement of the tooth and disk. The barrel I65 is also provided with a disk I15 having a peripheral notch I16 which cooperates with a spring held detent arm I11 when the lever "I is moved to disengage the clutch. so as to prevent rebound or reverse rotation of the shaft.

The parts of the clutch and clutch magnet are shown in the home position with the armature arm I14 and detent I11 holding the shaft I6I and drive shaft I33 in that position. When the clutch magnet CLM is energized by the closure of contacts I56, the armature I14 which is pivoted at I16 is attracted and is moved counterclockwise as viewed in Fig. 12 so that the outer end of arm I13 is moved out of engagement with the outer protruding end I12 of the lever "I. The clutch I59 then becomes engaged in the manner just explained, and the shaft I 6| and drive shaft I33 commence a revolution. Connected in series in the circuit which includes the clutch magnet CLM are a pair of contacts I60 (also shown diagrammatically in Fig. 1'1) which are held closed in the home position by a cam IBI on the shaft I6I. After the clutch I59 is engaged. and the shaft I6I rotates approximately 43 of a revolution. the cam I6I opens the contacts I which open the energizing circuit for the clutch magnet CLM. The magnet CLM is thereby deenergized and the armature I14 and arm I13 is moved clockwise by the spring I62, so that the outer end of the arm I13 is placed in the path of the outer protruding end I12 of the lever HI and when the latter engages the arm I13 at the end of the revolution, the clutch is disengaged thereby and the shafts I6I and I33 stopped in the home position as previously explained.

As explained previously. during a revolution of the shaft I6I and drive shaft I33, any of the punch actuating levers I29 to I29, inclusive. which have been latched at their ends I34 by their related latch levers I49 to I49, inclusive, will move their related punch elements to punch holes in the tape 95. The feed hole punch element FP will be actuated each time the shaft I33 rotates because the lever I49 latches the end I34 of lever I29 for each cycle of recorder operation. The eccentric I32 is so positioned on the shaft I33. that the punches enter the tape at about 85 after a revolution has begun and leave the tape at about 269 of the revolution.

As can be seen from an examination of Figs. 13 and 14, the drive shaft I33 extends downwardly through a horizontal partition wall I85 and on the lower extension thereof is fixed a plurality of cams and other eccentric devices which function, respectively. during each revolution of the drive shaft, to lock the L-shaped latch levers in the position they occupy Just after the beginning of the revolution and while the tape is being punched, to feed the tape after the punch elements have been retracted from the tape, and to restore during the latter part of each revolution the L-shaped latch levers ill to I49, inclusive, into latching engagement with their related armatures.

A tape feed cam I99 is fixed on the lower end of shafts I33 and the feed mechanism operated thereby will be described hereinafter under a separate heading.

Also, fixed to the lower end of the shaft I33 is a cam I9I which controls through a lever arm I92, shaft I93 and locking bail I94, the holding or locking of the L-shaped levers in their respective positions they occupy just after the beginning of a revolution, so as to prevent their accidental displacement while the tape is being punched. The shaft I93 extends through the wall I95, and the locking bail I94 is fixed to the upper end thereof. One end of the lever arm I92 is fixed to the lower end of shaft I93 and its other end engages the face of the cam I9I. A tension spring I95 holds the arm I92 in engagement with the face of cam I9I.

Fixed to the upper side of cam I9I. is an eccentric stud I99 which is in operative engagement with the outer end of a lever arm I91. The other end of lever arm I91 is fixed to a lower extension of shaft I41 and a bail I98 is fixed to the upper part of shaft I41. The stud I96, through the arm I91 and shaft I41, causes the bail I99-to engage the L-shaped latch levers after a punching operation, and to move the latch levers out of engagement with their related punch actuating levers and into a position where they are again latched by their respective armatures. As there is no armature for latching the lever I49, its spring I43 will return it into latching engagement with its lever I29 as soon as bail I98 is returned to home position. A tension spring I99 holds the arm I91 in engagement with the eccentric stud I98.

Also fixed to the lower end of drive shaft I33 is a disk 299 and projecting from the upper and lower sides. respectively. of the disk are a pair of eccentric studs 2I9 and 2| I which are operatively engaged by a pair of arms 2I2 and H3 fixed to the lower ends of shafts 2I4 and H5. The outer ends of the arms 2I2 and 2I3 are held in engagement with the studs 2I9 and 2 by suitable tension springs 299 and 2990., respectively. The shafts 2I4 and 2I5 extend upwardly through the wall I95 and armature knock-oil bails 2I6 and 2" are fixed to their upper ends, respectively.

The bails 2I9 and 2" are operated after punching or the tape. by their respective eccentric studs 2I9 and 2 to knock oil anyarmatures which have been energized. A tension spring 2I9 connected to each armature I59. snaps its armature outward against its related latch lever as soon as the bail dlsengages the armature from its tripping magnet. As viewed in Fig. 7, the bail 2l9 coacts with the armatures oi the left-hand group of magnets and the ball 2" with the armatures of the right-hand group of magnets.

Figs. 13 and 14 show the relative position of the parts after the punch elements have cleared the tape and at the high point of a tape feeding mechanism. As stated previously, Figs. '7 to 12 inclusive, show the relation of the parts in the home position.

Soon after a cycle of recorder operation has been Initiated by the energizing oi the clutch magnet CLM, and after the drive shaft I33 has started a revolution, for example, about 7 past home position, the cam I9I moves the locking bail I94 from the full line position shown in Fig. '7 to the dotted line position where it is behind the L-shaped latch levers which have been tripped and are in latching engagement with their related punch actuating levers, and where it is in front of the L-shaped levers which have not been tripped. Thus, the locking bail I94 will prevent accidental movement of the L-shaped levers during a punching operation. The cam I9I will move the bail I94 back to the full line position shown in Fig. 7. at about 214 of drive shaft rotation, at which point the punch elements will have passed the peak of their punching movement and started on their return movement. The eccentric stud I99 will coact with the arm I91 and shaft I41 to move the bail I99 to engage the L-shaped latch levers for restoring the latter at about 238 and will first move the latch levers counterclockwise as viewed in Fig. "I, and beyond the position for latching with their related armatures. The latch levers will move counterclockwise past their latched position shown in Fig. 7. at about 249. The high point of counterclockwise movement of the bail I93 is at about 260 and the latch levers will return in a clockwise direction to latching position with respect to the armatures at 318. The armatures I59 which were not previously tripped will be held in engagement with the latch levers due to the action of their springs H9. The knock-oil balls 2I9 and 2" will engage and release the armatures which have been attracted bv their magnets at about 235, and their springs 2I9 will snap them outward against their latch levers. When the bail returns the L-shaped levers to the latching point at 318, the armatures I59 will latch their ends I49 and hold them in the latched position shown in Fig. 7 and the bail I98 will then continue its return or clockwise movement until it reaches the home position which is shown.

It is noted at this point that when the levers Hi to I49, inclusive, are moved clockwise in a restoring direction by the bail I99, the spring force inherent in the contacts I59 is enough to move the contact bail I55 along with the L- shaped levers and thereby open such contacts. The contacts I58 will open at about 249 and at this time the contacts I99 under the control of the cam IBI on the shaft I5I will still be open. The cam I89 again closes the contacts I9I at about 313 of rotation and the contacts IBI will remain closed until the parts reach home position and until they are again opened by the cam I" in the manner described above, during the next cycle of operation.

As stated, mechanism is provided for spacing the tape for each recording operation and the mechanism is adjustable so that it will space the tape either forward or backward at the selection of the operator. Normally, the mechanism is adjusted to space the tape forward and such is the position of adjustment shown in the drawings; but, as will appear more fully hereinafter, under certain special conditions of operation, the mechanism can be readily adjusted so that it will space the tape backward. An example of such a special operating condition is when it is desired to nullify a previously recorded code designation.

The tape feeding mechanism is shown in Figs. 13, 14, 15 and 16, and as stated previously. is operated by the cam I98 fixed to the lower end of the drive shaft I33. In Figs. 13, 14, and 15 the parts are shown in the position they occupy at the high point of a tape feeding operation. Fig. 16 shows the position of the parts when the feeding elements are fully retracted. It will be readily appreciated that while in the illustrated embodiment, the tape feeding mechanism is advantageously disclosed as a structural part of the recorder 298, the invention is not in all of its aspects limited thereto, for insofar as certain of the broader aspects of the invention are concerned, the tape feeding mechanism may be separate from the recorder.

The tape feeding mechanism includes a feed wheel 220 having radial feeding pins 22I spaced so as to engage the feed holes 95 of the tape 95. The wheel 220 is fixed on the upper part of a feed shaft 222 and the latter extends downward through the partition wall I85 and on the lower end of the shaft is fixed an advancing ratchet 223 and a reversing ratchet 224. An advancing pawl 225 is mounted to slide between spaced guide plates 226 and for each normal recording operation of the recorder is moved to engage and rotate the advancing ratchet 223, the shaft 222, and feed wheel 220 in an advancing direction a sufficient distance to space the tape 95 the width of a recording field or vertical column. A reversing pawl 221 is mounted to slide between spaced guide plates 228 and when the mechanism is adjusted to feed the tape backward, is moved during each recording operation to engage and rotate the reversing ratchet 224, shaft 222 and wheel 22!) in a reversing direction a sumcient distance to space the tape backward one field.

In Fig. 16, the lower of the guide plates 225 and 228 have been removed to expose the two pawls 225 and 221 and illustrate more clearly their construction and operation. Tension springs 229 and 2!!) connecting, respectively, the pawls 225 and 221 with fixed studs 23I and 232, serve to urge the pawls constantly in a retracting direction. When the recorder is in home position, both pawls 225 and 221 are fully retracted and are out of engagement with their respective ratchets. A knurled hand-feed wheel 234 is fixed to the upper end of the feed shaft 222 and protrudes partially through a slot in the front wall of the recorder 200 (see Figs. 1, 8 and 11). Thus, with the parts of the recorder and feed mechanism in home position, the feed shaft 222 may be readily rotated by hand to feed the tape 95 in either direction. A toothed wheel 235 is also fixed to the feed shaft 222 and a spring pressed detent 236 cooperates therewith to assure proper positioning of the recording fields of the tape with respect to the punch elements.

. Cooperating with the tape feed cam I is a cam follower 231 which is held against the face oi. the cam by a suitable tension spring 238. The cam follower comprises an arm 239 having a roller 24!) on one end thereof engaging the face of the feed cam and being pivotally supported at its other end to move about a fixed axis by a fixed stud 2 depending from the wall I85. The mov able end of the arm 239 is supported by a suitable bracket 242 depending from the wall I85.

A tape feeding motion is selectively transmitted from the cam I90 and follower 231 to either of the feed pawls 225 and 221 by a selector plate 244 movable to either of two positions and interposer pins 245 and 246 carried by and movable with the selector plate 244. The selector plate 244 is in overlying engagement with the follower arm 239 and extends for the full length of the latter and beyond the end thereof which is pivoted to the stud 2. The selector plate 244 is formed with a longitudinal slot 241 receiving the pivot stud 24l (see Fig. 13) and the interposer pin 245 extends downward from the plate 244 and within a longitudinal slot 249 formed in the follower arm 239. Thus, the plate 244 may be adjusted lengthwise with respect to the follower Within. limits determined by the length of the slots 241 and 248.

A tension spring 259 connecting a stud 25I ex tending upward from the selector plate 244 and a stud 252 extending downward from the partition wall I85, constantly urges the selector plate 244 to move upward as viewed in Figs. 13 and 16, which are bottom plan views, and toward the left as viewed in Fig. 15. Thus, the spring 250 tends to maintain the interposer element 246 at a position where it engages the upper end of slot 248 in Figs. 13 and 16 and the left-hand end of the slot as it appears in Fig. 15. This is the normal operating position for feeding the tape forward.

In Fig. 16, the parts are shown in their normal operating position with the roller 240 on the base of the cam I99. In this position, the interposer element 246 clears an operating face 254 formed on the rear of the reversing pawl 221 and the interposer element 245 is aligned with a similar operating face 255 formed on the advancing pawl 225. Thus, when the cam I90 moves the follower 231 forward, the interposer pin 246 and selector plate 244 will also move forward and the interposer pin 245 will engage the rear face 255 of the pawl 225 and move the latter into engagement with its ratchet 223. The pawl 225 is guided in its forward movement by a stud 251 on the pawl 225 moving within a slot 256 formed in one of the guide plates 226 and by studs 259, 260, and 25I extending between the two guide plates 228. Due to the angle at which the spring 229 extends, when the pawl 225 begins to move toward its ratchet the spring 229 tend to move the pawl counterclockwise about the pin 251, as viewed in Fig. 16, and thereby effects engagement with the ratchet 223. Fig. 13 shows the position of the parts at the high point or end of the feeding movement of the advancing pawl I96.

A reverse feeding movement of the tape is effected by energizing a reversing magnet RVM in a manner which will be more fully explained hereinafter, The reversing magnet RVM has an armature 264 pivoted at 265 and including an arm 266 engaging the outer end 261 of the selector plate 244. Thus, when the magnet RVM is energized, its armature 264 is attracted and the arm 265 moves the selector plate downward, as viewed in Fig. 13, against the force of the spring 250 until the interposer element 245 occupies the lower end of slot 243, as viewed in Figs. 13 and 16, or the right-hand end of the slot 243 as viewed in Fig. 15. The interposer pin 243 will then occupy a position behind the face 254 of the reversing pawl 22'! and the interposer pin 243 will clear the face 255 of the advancing pawl 22!. With the selector plate held in this position by the magnet RVM, when the cam I90 moves the follower 231 forward it will also move the interposer element 246 forward into engagement with the rear face of reversing pawl 22'! and thereby move the pawl into engagement with its ratchet 224 to feed the tape backward the space of one recording field. The pawl 221 is guided in its movement by a stud 213 projecting therefrom and moving within a slot 2' formed in one of the guide plates 22B and by fixed studs 212, 213 and 214 extending be tween the guide plates 223. The direction of extent of spring 230 is such that after a feedin movement of reversing pawl 221 has begun, the spring will urge the nose of the pawl into engagement with the ratchet.

As shown in Fig. 16, the cam I90 is so shaped as to provide a relatively rapid retraction of the follower 231 and the feed pawls, after a feeding stroke is completed. The cam I33 is so positioned on the shaft I33 that the tape feed shalt 222 does not start movement until after the punch elements have cleared the tape. As stated above. the eccentrics I32 are so positioned on the shaft I33 that the punch elements leave the tape at about 260" of each revolution. The cam I is shaped and positioned so that the tape feed shaft will start moving at about 280 and complete its movement at about 324.

The permutation unit 333 is shown in Figs. 2, 3, 5, and 6 and comprises a pair of parallel side frame members 3H! and 3 extending between and rigidly connected at their ends, respectively, to opposite sides of the typewriter base II. The unit 306 also comprises six permutation bars or slides SI. S2, S3, S4, S5 and 88 corresponding, respectively, to the six code positions 1, 2, 3, 4, 5, and 6 in Fig. 18. The slides SI to S6, inclusive, are mounted in spaced parallel relation between i s frame members 3") and 3H and are indivflually supported for lengthwise movement by guide rollers 3l2 mounted on shafts M3, 3, M5, and 3l6 extending between and fixed at their ends in the frame members 3lll and 3. The shafts 3'3 and 3|! are arranged at the left-hand end 01' the unit 300 as viewed in Fig. 6 and the shafts 3 l4 and M6 at the right-hand end thereof. Each permutation slide is supported and guided at its top and bottom and at its two ends by a set of four guide rollers mounted, respectively, on the four shafts. The guide rollers are free to rotate on their respective shafts and the rollers on each shaft are spaced apart slight distances to prevent binding of adjacent slides. A fixed abutment in the form of a bar 3IB joins the frame members 3Iil and 3 at the right-hand end thereof, and the right-hand ends of all slides are held, respectively, against the bar 3"! in their normal or inactive positions, by six tension springs 3". Three of the springs 3 I! connect, respectively, the upper right-hand ends of slides S6, S4, and SI with a rod 323 Joining the two members an: and 3H, and the other three springs 3l3 connect the lower right-hand ends of slides S5, S2 and S3 with a rod 32l also joining the two members 3"! and 3. The six slides SI to S6 inclusive, are provided, respectively, at their left hand ends, with code contact actuators 33!, 332, 333, 334, 335, and 336 which control, respectively, the six sets of code contacts SCI, 8C2, S03, S64, S06, and SCI. The six sets of code contacts SCI to S03 control, respectiveiy, the energizing circuits for the six tripping magnets RMi, to RMB, inclusive, previously described. As will be apparent, when each of the slides is moved to the left as viewed in Fig. 6 in a manner to be presently described. it will close its related set of code contacts. Also. when an one of the slides is moved to the left. the lower left-hand end thereof engages and moves to the left a bail member 333 common to all of the slides and mounted on a pivot shaft 333 supported at its ends by the two frame members 3!! and 3| i. The bail 333 when moved to the left by any one of the slides, engages and moves a slidable rod 343 which in turn, engages and closes a pair of contacts C which as will presently appear, connect the plus side of a D. C. control circuit with six parallel circuits containing, respectively, the six code contacts and the six tripping magnets. All of the contacts SCI to 303 and C are normally open spring contacts and when the slides are retracted to the right by their respective springs 3| 9, the contacts will open. The contacts are so positioned and adjusted that the contacts C close after and break before the closing and opening of the code contacts SCI to 803, inclusive: the main purpose of the latter being to provide for simultaneously energizing the tripping magnets so that all or the L-shaped latch members which are to be released, will be released as near as possible at the same time.

In accordance with the present invention, means is provided for differentially operating the slides SI to S6. inclusive in response to the actuation of each typewriter key. so that the code contacts closed thereby and the related tripping magnets energized will effect the punching of code hole designations in the tape corresponding to the key actuated. As pointed out previously, Fig. 18 discloses the code hole designations corresponding to each of the typewriter keys in accordance with a selected combinational code.

The differential operating means for the permutation slides comprises a plurality of actuating links 34! corresponding. respectively, to the typewriter keys, and each link being pivotally connected at its forward end (see also Fig. 2) to the cam unit operated by its related typewriter key and pivotally connected at its rear end to a fixed rod 342 extending between and connected at its ends to opposite sides of the typewriter frame i4. The actuating links extend transversely of the permutation unit and through pairs of aligned slots 343 and 344 formed in the lower parts of frame members 386 and 3i i respectively, there being a pair of slots for each link. The

plurality of pairs of aligned slots receiving, re-

spectively. the actuating links, may be considered as actuating stations of the permutation unit.

When a typewriter key is depressed and its related cam unit operated by the power roller IS in the manner previously described, operative movement of such cam unit will move the actuating link 3 which is connected thereto in an upward direction in its pair of slots 343 and 344,

and such actuating link will engage and move to the left as viewed in Figs. 5 and 6, the permutation slide, or combination of slides, which correspond to the code designation of the key actuated.

Upward movement of a link in its respective pair of slots 343 and 344 efl'ects a movement to the left of a slide when that slide is provided with an actuating projection 345 having an inclined cam surface 343 located so that it will be engaged by the link when moved upward. The actuating projections 345 with their cam surfaces 343 are provided on the slides in accordance with the selected code illustrated in Fig. 18. For example, the link 34Ia (see Figs. 5 and 6) fits within the pair of slots 343a and 344a providing its corresponding actuating station, and the link 34Ia is moved upward as a result of the depression of the typewriter key l corresponding to the letter "Q and of the resulting operation of its related cam unit I5. For an examination of Fig. 18, it is noted that the code designation for "Q" is a hole in each of code positions 1, 2, 3, and on the tape. Thus, the corresponding slides SI, S2, S3 and S5 are provided with the necessary actu ating projections 345 and cam surfaces 343 and the remaining slides S4 and S5 at this actuating station are provided with notches 343 so that they will not be actuated by an upward movement of the link 3410. by its related cam I6.

It will be apparent from the foregoing that a depression of the typewriter key marked with the letter Q will result in the slides SI, S2, S3, and S5 being moved simultaneously to the left as viewed in Fig. 5 to close the corresponding code contacts SCI, S02, S03, and $05 which will energize the related tripping magnets RMI, RM2, RM3, and RM5. The energizing of these magnets will release the related latch levers I4I, I42, I43, and I45 to latch up their related punch actuating levers I2I, I22, I23 and I25, and close the bail contacts I55 to initiate a cycle of recorder operation which will result in the actuation of punch elements RPI, RP2, RP3, and RPS to punch code holes in the positions 1, 2, 3, and 5 in the tape. As there is no provision for latching the lever I40 by the armature of a tripping magnet, its spring I48 will cause its end I35 to engage and latch the end I34 of its lever I20, and when the recorder goes through a cycle of operation the element FP will also be actuated to punch a feed hole 93.

With the exception of the shift keys, the depression of any of the character keys or any of the other functional keys will result in the recording of a corresponding code hole designation in a field of the tape in the same manner as described above in connection with the character key corresponding to the letter Q."

Referring to Fig. 3 of the drawings, it is noted that an actuating link 34Ib is pivotally connected at its forward end to the cam unit 41 by a short connecting link 350, and is provided at its rear end with an elongated downwardly facing notch 35l receiving the transverse supporting rod 342. The intermediate portion of the link 3412) is provided with an upstanding actuating projection 353 wide enough to overlap five of the permutation slides when moved upward. The notch 35I is long enough to permit the link 34Ib to be shifted 1engthwise between its normal forward position (shown in Fig. 3), where the projection 353 overlaps the five forwardly located slides, and a rearward position where the projection 353 will overlap the five rearwardly located slides. The bottom of the notch 35| is formed with a pair of juxtaposed recesses 352 for restraining the link in its forward and rearward positions, respectively.

Considered in the direction extending from the front to the rear of the typewriter, the permutation slides are arranged in the following order: 83, S5. S4, S2, SI, and S3. At the actuating station corresponding to the link 34Ib, all of the slides are provided with actuating projections 34521 and cam surfaces 34Gb with the exception of the forward slide S6 which is notched out as indicated at 3431!. Thus, when the link 34") occupies its forward position, the position shown in Fig. 3. and is moved upward by the operation of its cam unit 41, the slides S5, S4, S2 and SI will be actuated (S6 being notched out); and, when the link occupies its rearward position and is moved upward by the actuation of the cam unit 41, the slides S5, S4, S2, Si, and S3 will be actuated.

As shown in Fig. 3, the link 34Ib occupies its forward position when the type basket is in lower case position. Means is provided for shifting the link 34Ib to its rearward position when the type basket is shifted to upper case position and for shifting the link back to its normal forward position when the type basket is again returned to lower case position. To this end, a downwardly extending lever arm 354 is fixed to the transverse shaft 36, on which is also fixed the two arms 35 which shift the type basket. The lower end of arm 354 is connected by a link 355 to the outer end of one arm 356 of a bell crank rotatably mounted on a shaft 351 which is suitably supported by the typewriter frame. Another arm 358 of the bell crank extends downwardly and is formed by a pair of spaced leaf spring members 359 and 330, having their lower ends arranged on opposite sides, respectively, of a stud 36l projecting from the side of the link 34Ib.

As explained previously, in the portion of the description relating to the shifting of the type basket to upper case position and back to lower case position, the cam unit 41 is actuated when the key lever 45 is moved downward as a result of depressing the shift keys, and the cam unit 41 is again actuated when the key lever 45 is released and moves upward. Therefore, when the cam unit 41 is operated to shift the type basket to upper case position, the link It: is moved upward and actuates the slides S5, S4, S2, and SI which as previously explained, effect the punching of holes in the corresponding code positions of the tape. From an examination of Fig. 18, it will be noted that holes in code positions 1, 2, 4. and 5 of a tape field comprises the shift" code designation.

When the cam unit 41 was first operated, the type basket shifted to upper case position and as a result the arm 354 moved counterclockwise as viewed in Fig. 3. The counterclockwise movement of the arm 354 resulted, due to the connecting link 355, in the arms 356 and 358 of the bell crank being moved clockwise. Such clockwise movement will cause the forward spring 360 to be flexed; but the spring can not shift the link 34) to its rearward position until the cam unit 41 is returned to normal position. The reason for the latter is because as soon as the cam unit 41 was actuated, the link 34Ib moved upward and engaged the permutation slides whch resulted in a distinct downward pressure of the rear end of the link 34Ib on the rod 342 and, as the rod occupies the rear recess 352 in the bottom of the notch, sufficient resistance is offered thereby to prevent the lengthwise shifting of the link 34Ib. When the cam unit 41 returns to normal or inactive position, the pressure of the rear end of the link 34lb on the rod is relieved and the forward leaf spring 350 can then shift the link 34Ib to its rearward position. With the link in the rearward position and

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