US1078620A - Printing-telegraph receiver. - Google Patents

Description

G. S. HILTZ; PRINTING TELEGRAPH RECEIVER.

I APPLICATION FILED MAR. 21, 1912. 1,078,620, Patented Nov. 18, 1913.

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APPLICATION FILED MAR. 21, 1912. 1,078,620. Patented Nov. 18, 1913.

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APPLICATION FILED MAR. 21, 1912. 1,078,620. Patented Nov. 18, 1913.

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APPLICATION FILED MAR. 21, 1912. 1,078,620, Patented Nov. 18,1913.

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Gauge S15E19, 5 mm wtoz 3 WW G. S. HILTZ.

PRINTING TELEGRAPH RECEIVER.

APPLICATION IILED MAR. 21, 1912.

Patented Nov. 18, 1913.

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PRINTING TELEGRAPH RECEIVER. APPLICATION IILED nun. 21. 1912.

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jaw 4 hi0 G tto'cqu d UNITED STATES PATENT OFFICE.

GEORGE S. HILTZ, OF NEW YORK, N. Y., ASSIGNOR TO THE STOCK QUOTATION TELEGRAPH COMPANY, OF NEW YORK, N. Y., A CORPORATION NEW YORK.

PRINTING-TELEGRAPH RECEIVER.

To all whom it may concern Be itknown that I. GEORGE S. HIUrz, a

citizen of the United States, residing at New York, county of Kings, and State of New York, have invented certain new and useful Improvements in Printing-'lelegraph Receivers, of which the following is a full, clear, and exact description.

, This invention relates to receiving apparatus for printing telegraph systems, more particularly apparatus of the general type described in the prior patents of John Burry, No. 680,693, issued August 20, 1901, and No. 962,694, issued June 28, 1910.

In general, the chief object of the present invention is to provide what is known as a one wire machine, that is, a machine which requires only one transmission circuit instead of two or more as is often the case, thereby materially reducing the cost of installation and operation of the system.

A further object is to simplify the apparatus generally, decreasing the cost of manufacture and diminishing the liability of derangement and like difficulties in use.

To these and other ends the invention consists in the novel features of construction and combinations of elements hereinafter described, and more particularly set forth inthe appended claims.

A convenient and effective embodiment of the invention is illustrated in the acconn panying drawings, in which Figure 1 is a front view of the complete machine. Fig. 2 is a plan view of the same. Fig. 3 is an end view of the machine, from the left of Fig. 1. Fig. 4 is a cross section on line aa of Fig. 1. Figs. 5 and 6 are also sections on line aa of Fig. 1, but with certain parts added and others omitted. Fig. 5 also illustrates certain parts of Fig. 4 in a different operative position. Fig. 7 is a detail sectional view on line bb of Fig. 1, and Fig. 8 is a similar but fragmentary view of certain of the parts in a difl en ent position. Fig. 9 is a diagrammatic view showing the wiring of the machine.

The operative parts of the machine are conveniently arranged on or-between three vertical plates or frames 10, 11, 12, which are mounted on a suitable base 13, preferably of insulating material.

The type by which the printing is done are arranged on the periphery of a typewheel or type carrier 14 fast to a hub 15 Specification of Letters Patent.

Application filed March 21, 1912.

Patented Nov. 18,1913. Serial no. 685,145.

slidably mounted on a triangular or knifeedge shaft 16 journaled in forward extensions or brackets 17, 18, 19 on the frameplates 10, 11, 12 at the upper part thereof. The shaft is rotated to bring any desired character to the, printing; point and the type wheel is moved along the shaft step by step to effect the letter spacing, as will be readily understood. For the purpose of rotating the shaft it is provided between the frame plates 10, 11, with a pinion 20, meshing with a gear 21 loosely mounted on a shaft 22 (Figs. 1 and 2) journaled in the frame plates 10, 12. This gear on its inner face has a pin 23 engaged by the end of a coil. spring 241 encircling shaft 22 and engaging the same frictionally at one end. Assum ing that the gear 21, pinion 20, and shaft 16 are prevented from rotating it will be seen that rotation of the shaft 22 in the proper direction will tension the encircling spring, causing the same to urge the gear in the direction of the arrow in Fig. 3, but that over-winding of the spring is prevented by the slip afforded by the frictional engagement between the spring and the shaft.

The rotation of the shaft 16 and type wheel 14 is made step-by-step by means of a scape wheel 25 alongside of the pinion 20, having staggered teeth on opposite sides of its periphery and cooperating with a vibrating tongue 26. The latter is the armature of a polarized electromagnet 27, composed of two coils 28, 29, and a permanent magnet 30, secured to the frame plates 10, 11. Ourrents of ditferent polarity flowing through the coils will therefore cause the tongue 26 to vibrate, thereby releasing the scape wheel and allowing the shaft 16 to rotate step-bystep to bring the desired character to the printing point. Thus a current of a certain polarity will strengthen the magnetism of one pole of the magnet and neutralize the magnetism of the other pole, thereby causing the tongue to swing to the strengthened pole. Similarly, current of opposite polarity will cause the tongue to swing to the other pole. In this way, by alternating the polarity of the current impulses sent through the magnet coils, the type wheel is caused to rotate step-hy-stcp. Adjustable screw stops 31, 32 are provided on opposite sides of the tongue to limit its swing in each direction.

To permit justifying of the type wlieei,

that. is, accurately positioning of the characters at the impression point before the printing is effected, the shaft 16 is divided in the usual manner (not shown), adjacent to the frame plate 11 On one part of the shaft is an ad'ustably mounted stop 33, engaged by a shoul er on the hub ofa star wheel,34 fixed on the other part, so that as the part carrying the pinion 20 is rotated the stop 33, engaging said shoulder, will turn the other part in the same direction but Wlll permit more or less backward rotation thereof.'

Pivoted on the plate 11, adjacent to the star wheel, is a short finger 35 (Figs. .2 and 4) having alaterally extending pin or stud 36, so that as the upper and forward portion of the finger is depressed the stud will enter the opposed notch on the star wheel and, by the resulting camming action of the same, give the type wheel shaft 16 aslight movement of rotation sufficient to bring accurately to t he impression point the character which had been brought a proximately thereto through the medium 0 the sca pe wheel 25 being understood that the characters oirtlie type Wheel and the notches on the star wheet are in accurate register of alinemcnt Wlill'l. is normally held each other. The finger 35 up, with the stud 36 disen aged from the star wheel, by a light coil siiring 37, but is depressed in advance of each pa nting operation by an arm 38 extending forwardly from the armature shaft 3"), of a magnet 40, into engagement with a pin 41 on thelowcr portion of the finger. The arm just mentioned is preferably made suf iciently yielding or springy toavoid excessive pressure of the stud 36 on the justifying star-wheel 34.

To minimize the binding effect of the driving spring 24 (Figs. 1 and 2) urging the scape l-wheel teeth against .the armature tongue 26, the pinion 20 by which the'force of the spring is transmitted to the scape wheel shaft 16, is loosely mounted on the shaft but is connected yieldingly thereto by a coil spring 42 which encircles the shaft and engages the same and the pinion frictionally.

The spring 24, which, as previously ex-- plaincd, rotates the type wheel, is wound up by a suitable ratchet and pawl mechanism shown in'Fig. 3. The ratchet 4'3 is rigidly mounted on the shaft 22, and cotiperating therewith is a pawl 44 pivoted on the lower portion of an arm 45 adj11stably.fastened on the armature shaft 39 of the magnet 40, so that as the shaft is rocked by energization of the magnet the pawl will be raised and so impart a slight movement of rotation to the ratchet and the shaft. 22. This actuation of the shaft 22 is aided by another paw], 46, the purpose of which will be more fully explained hereinafter. During the retraction of these pawls the ratchet is' held against backward rotation by a holding pawl 47. Between the frame plates 10, 11, the shaft 22 is provided with a heavy fly wheel or momentum device 48 (Figs. 1, 2 and 3), which, started by the vigorous impulse of the pawls 44, 46, carries the shaft around farther than the movement of the pawls alone would carry it, thereby increasing the winding effect and' insuring sufficient tension at all times to cause instant response of the scape wheel to the vibration of the armature tongue 26. As previously explained, over- 'winding of the spring is obviated by the frictional engagement between the spring and its shaft 22.

The magnet 40, through the instrumentality of its armature 49 and shaft 39, also shifts the type wheel along the shaft 16 to efiect the letter. spacing, as will now be explained.

Below and to the rear of the type'whecl shaft 16 is a triangular or knife-edge shaft 50 (Figs. 1 and 4) journaled in the frame plates 11, 12 in such a manner as to permit a slight movement of rotation and carrying a sliding sleeve 51 provided with arms '52 extending upwardly into engagement with an enlargement 53 of the type wheel hub 15 on opposite sides thereof, so thatthe type wheel can rotate with its shaft but will move axially on its shaft as the sleeve 51 is shifted. This sleeve is connected to two cords 54, 55, extendinglin opposite directions over pulleys 56, 57 to winding drums. 58, 59, so that the sleeve, and with it the type wheel, will be drawn to right or left according to the direction of rotation of the drums. The drum 59 is fixed on a shaft 60, on which a ratchet 61 is fixed at the left of the drum 58. This ratchet is actuated, clockwise as viewed in Figs. 4 and 5, by a hook pawl 62 pivoted at its rear end to an arm 63 depending from armature shaft 39 and adjustably fastened thereto. When the armature 49 is depressed the consequent swing of the arm 63 advances the pawl 62 past one tooth on the ratchet; when the armature is raised bythe powerful coil spring 64 (Fig. 3) cooperating with the arm 45 the rearward swing of the arm 63 retracts the pawl and turns the ratchet 61, shaft and winding drum 59 through an angle equal to the angular width of one tooth, thus shifting the type wheel a distance equal to one letter space along the shaft 16. Backward movement of the ratchet 61 is prevented during the advance of pawl 62 by a holding pawl 62, held normally in engagement with the ratchet by a light spring 62". The rightward travel of the type wheel is availed of to provide power for the retraction of the type wheel to initial position, through the instrumentality of two coil springs 65 and 66, encircling shafts 60 and 67. The first of these springs has one end engaging a pin 68 on a collar 69 fast on the sleeve 69, which is loose on the shaft 60 and connected to the hub of the winding drum 58. The other end of the spring 65 bears against a pin on a. pinion 71 loosely mounted on the shaft 60 and meshing with a gear 72. The gear just named is loose on the fixed shaft 67 and has a pin 73 engaged by the adjacent end of the spring 66, the other end of which is fastened to the shaft. Now as the shaft '66 is rotated to advance the type wheel, the unwinding of the cord 54 rotates the winding drum 58 which communicates its motion to't he spring 65, pinion 70, gear 72, and spring 66, thereby tensioning the two springs, which, as will be seen in Fig. 1, are coiled in opposite directions. It will therefore be seen that if at any time the pawls 62 and 62 are simultaneously dis-.

engaged from the ratchet 61 the springs 66,

65 will instantly revolve the drum 58,; which, by winding up the cord 54, retracts; the sleeve 51 and with it the type wheel. Manifestly, this return of the type wheel to initial position should take place from any desired point in the type wheels path at the will of the sending operator. For this purpose the following mechanism is provided: The pawl 62 is provided on its under side with an inclined cam-edge 74 (Figs. 4 and 5) adapted to engage, as the pawl is advanced bymagnet 40, a pin or stud 75 on the lower endiof an arm 76 piv oted at its upper end 50 the bracket 18. Between the cam edge 74 and the point of attachment to the arm 63 the pawl is pivotally connected to a depending link 77 which is pivotally connected at its .lower end to a lever 78 at the point 79, which lever is fulcrumed on the frame plate 11 at 80, in rear of the point 79. At its forward end this lever is provided with a stud 81, lying under the tail of the holding pawl 62*, which, it will be remembered, normally holds the ratchet 61, shaft 60, and winding drum 59 stationary during the advance of the actuating or letter-spacing pawl 62. Ordinarily, the cam-edge 74, as the pawl 62 is advanced, simply swings the arm 76 idly forward; but when the sending operator desires to return the type wheel to initial position he rotates the type. wheel (by sending impulses of alternating polarity through magnetic coils 28, 29, as previously explained) until a certain blank space on the type wheel is at the printing point. 011 the type wheel shaft 16 is a finger 82, which, when the said blank space is at the printing point, stands opposite and almost in contact with a lug 83 on the swinging arm 76. \Vhen the arm 76 starts to swing as the cam-edge 74 advances it finds the finger 82 in its path and is arrested thereby. The cam-edge then rides up on the stud 75, lifting the pawl 62 out of engagement with the ratchet and also raising link 77. The latter raises the forward end of lever 78, which in turn raises the rear end of the holding pawl 62, thereby disengaging the pawl from the ratchet, as shown in Fig. 5. The ratchet and the winding drum 58 can now revolve under the influence of springs 65, 66 and retract the type wheel as previously explained. When the type wheel is next rotated to bring a character to the printing point the finger 82 is carried away from in front of the lug 83, so that the type wheel can again move forward.

The type wheel should of course be returned to initial position when it reaches the end of its rightward travel, but as the distant sender may forget. this important movement, provision is made as follows for the automatic return of the wheel whenever it reaches its extreme rightward position.

It is plain that whenever the stud 75, on the arm 76, is held stationary in the path of the advancing cam-edge 74 the pawls 62 and 62 will be disengaged from the letterspacing ratchet. For the purpose of thus holding the stud whenever the end of a line is reached an arm 84 (Fig. 4) is provided, having its upper end in front of one end of stud 75 and its lower end adjustably fixed on a shaft 85 journaled in the frame plates 11, 12, at the bottom thereof. At its right end this shaft has an upstanding arm 86 behind the shaft 67, provided with a forward] y extending finger 87. Manifestly, the forward movement of the stud 75as the pawl 62 advances causes the shaft 85 to rock and the arm 86 to swing forwardly; hence if the arm is held stationary the stud 75 cannot advance, and the cam-edge 74 will ride up on the stud, thereby disengaging pawls 62 and 62 from the ratchet 61 as previously described. Fixed to shaft 60, near the winding drum 59, is a pinion 88 meshing with a gear 8.) loosely mounted on shaft 67. Loosely mounted on the same shaft is an arc-shaped member 90 having a laterally extending pin 91 and also provided with a notch 92 which is in the circular path of a stud 93 on the gear 89. As the type wheel moves to the right the stud 93 engages the notch 92 and rotates the arcshapcd member on the shaft 67, carrying the pin 91 toward the stud 87 on. arm 86. At the instant the type wheel reaches its extreme rightward position the pin lies directly in front of the stud, as shown in Fig. 8; consequently the arm 86 cannot swing forwardly when the pin 75 on arm 76 is engaged by the camedgt' 74 on the pawl 62. The pin or stud 75 being thus held stationary the cam-edge 74 rides up on the stud and causes disengagement of the pawls 62, 62" from the ratchet 61, thereby permitting the springs 65, 66 to revolve the winding drum 58 and retract the type wheel, as previously described.

The paper on which the printing is done is preferably'in the form of a continuous strip, wound into a roll 94 (Fig. 2) carried on a spindle 95 removably mounted in suitable bearings at the back of the machine. From the roll the paper passes upwardly with its edges in slottedguide members 96 (Figs. 5 6 and 1). and passes between the type wheel and the printing bar or platen 97. Between the slotted guides the paper is engaged by two friction disks or wheels 98 on'a shaft 99 and two cramp disks 100 on a shaft 101. The latter shaft is journaled in pivoted carriers or arms 102 held in the position shown in Fig. 6, with the cramp disks cotiperating with the friction feed disks 98, by two blade springs 103. When the paper is to be inserted or removed the cramp disk shaft 101, with the cramp disks, can be swung up and out of the way, against the tension of the clamping springs 103. For the purpose of rotating the shaft 99, and with it the feed disks 98, so as to feed the paper step-by-step past the printing bar or platen, the shaft mentioned is provided with a ratchet 104 (Figs. 1 and 6) adjacent to the frame plate 11. This ratchet is engaged by a hooked feed-pawl 105 pivoted on the upper end of a vertical arm 106 rising from the armature shaft 107 of an electromagnet 108. The feed pawl being held in yielding engage ment with its ratchet by alight spring 109, it is evident that when the armature 110 is depressed by the magnet the resulting rearward movement of the pawl (Fig. 6) will rotate the ratchet through a corresponding angle, thereby feeding the paper past the printing point. Preferably the parts are so proportioned that the ratchet will be turned through an angle equal to one tooth at each depression of the armature, andthe feed disks 98 are of such diameter that the movement of rotation thus given them will give to the paper a movement of one line-space. To prevent backward movement of the pa per while the coil spring 111 is raising the armature 110 and advancing the feed pawl to the next tooth, a holding, pawl 112, is provided, held in engagement with the ratchet by a light spring 118. To prevent excessive movement of the paper in the forward direction when the feed pawl is in its rearward position as might be caused by the weight of a long strip of the paper depend ing from the machine. a second ratchet, 11 1, is provided alongside the first on the shaft 99, with a normally disengaged holding pawl 115. A light spring 116 tends to raise this pawl, but the latter is held down by a long finger 117 adjustably fixed on the arm- 106 and normally resting on a pin 118- on the pawl. As the feed pawl 105 is retracted the finger is withdrawn rearwardly off the pin, allowing the hooked holding pawl 115 to spring up into engagement with the ratchet 114 (Fig. 6). Advance of the feed pawl,to the next tooth on ratchet 104 brings -the finger again into engagement with the pin 118 and thus depresses the holding pawl 115. While the line-spacing mechanism is inactive the weight of the depending strip of paper, however long, is insufiiclent to overcome the inertia of the parts, but the paper may be grasped by the hand and drawn ofl the roll in any amount since as will be seen, none of the pawls prevents forward rotation of shaft 99 when the paperfeeding mechanism is not in operation. The upward movement of armature 110 and the forward swing of arm 106 are limited by a stop 110. f

It is obvious that the paper should be advanced one step at each return of the type Wheel toits leftward or initial position. This is effected automatically, as follows Themagnet 108 is in series with a pair of normal y closed contacts 119, 120 (Figs. 4 and 9), (which contactsare also in series with magnet 40), so that normally the magnet 108 is short circuited and therefore deenergized. When, however, the lever 78 is actuated (as previously explained) to disengage the holding pawl 62 from ratchet 61, a depending finger 121 on the rear arm of said lever engages the spring contact 119 and separates it from contact 120 (Fig. 5). This breaks theshort circuit and permits current to flow through magnet 108, thereby energizing the same and causing depression of the armature 110 with consequent actuation of the paperfeed pawl 105. The return of lever 78 to its normal position when the letter-spacing pawl 62 is retracted raises the finger 121 and permits the contacts 119, 120 to close again, thereby deenergizing magnet 108.

If additional line-spacing is desired, the sending operator brings, the finger 82 opposite lug 83 in the arm 76 (Pig; 4), whereupon repeated actuation of the armature 49 will cause a corresponding number of energizations of magnet 108; it being remembered that an attempt to print with the finger- 82 and stud 83 in alinement causes disengagement of holding pawl 62 from ratchet 61, which disengagement is always accompanied by onergization of magnet 108 and consequent feed of the paper as just described.

After the type wheel has been justified, as previously explained, the platen 97 must he moved forward to carry the paper against the type'wheel and effect the printing. For this purpose the platen is mounted in the upper part of a swinging frame 122 (Figs. 4. and 5) having at one end a depending finger 123 in the path of a finger 124 pivoted on the upper end of an arm 125 rising from a short shaft 126 journaled in the frame plates 10, 11, on which shaft the said arm is adjustably fixed. The finger 124 is held yieldingly against a stop 127 on the arm 125 by a light blade spring 128, so that as the arm is swung forward the finger 124 will be swung under the finger 123 when the two come into engagement. )Vhen, however, the arm 125 slvings rearwardly the finger 124,,held by the stop 127,

carries finger 123 in the same direction, thereby swinging the platen 97 against the paper and carrying the latter smartly against the type wheel, as will be readily understood. The shaft 126 is rocked, to actuate the arm 125, by an arm 129 adjustabiy mounted on the shaft outside of the frame plate 10 (Figs. 5 and 3) and connected by a link 130 to an arm 131 adjustably mounted on the armature shaft 132 of an electromagnet 133. On the last named shaft an adjustably mounted arm 134, pivotaily connected by means of a slot .135 and pin 136, to the arm 45, which, it will be remembered, is actuated by magnet 40 through the medium of armature 49 and shaft 39. It will therefore be seen that rocking of the armature shaft 39 rocks the shaft 126 and actuates the arm 125. It will also be seen that by reason of the greater combined length of arms 38. and 35 (Fig. l) by which the justifying pin 36 is actuated the type wheel will be justified bethe platen frame 122 and platen 97 are actuated bythe arms 45, 134, etc., as, obvious y, should be the case. The shaft 132 is also provided with an adjustably mount- .ed arm 137 (Fig. 3) to which the pawl 46,

previously mentioned, is pivoted, and by which the pawl is actuated.

For the purpose of making the operation of the machine as rapid as possible the mag nets 27 and 40 are energized simultaneously, the latter having a small time-constant and being capable bf energization by current of either polarity. It is evident, however, that the magnet 40 should not actuate its armature. 49,-to justify the type wheel and actuate the platenuntil magnet 27 has brought the proper character on the type wheel to the printing point. This necessary operation of magnet 27 before magnet 40 is provided for by making the spring 64, by which the parts connected to the armature 50 are restored to initial position and against which such parts must be moved by the said armature, too powerful to be over come by the magnet 40 unaided. Consequently, no matter how long current is allowed to flow through magnet 40 the latter cannot, by itself, actuate the armature and the train of mechanism connected therewith.

For the purpose of f-urnisl'iing the additional power required to depress the armature 49 the power-magnet 133 (Fig. 3) is prm ided between the frame plates l0. 11, in position to actuate an armature 138 adjustably fixed to and depending from the armarapidity.

ture shaft 132,which shaft, it will be remembered, is connected by arms 131 and 134 to the mechanism associated with armature shaft 39. The magnet 133 is not polarized, and can therefore be energized by current in either direction, but its time constant is relatively large, so that the comparatively rapid alternation of the impulses sent to actuate the armature tongue 26 will not energize the magnet sufliciently to actuate the armature 138; that is, before the field produced by current in one direction can build up to suflicient strength for the actuation of the armature the polarity of the magnet is reversed by an impulse of opposite sign, and so on, as long as the alternating impulses follow each other with sufficient When, however, the type wheel has been set by the alternating impulses from the transmitter the final impulse, of whichever polarity it happens to be, is simply prolonged moi'ncntarlly, thereby causing encrgization of the power-magnet 133. The armature 138 is now powerfully attracted at the same time that armature 50 is attracted by the already energized magnet 40, with the result that the two armatures are promptly actuated. Vhen the circuit is broken the magnets are deenergized, the armature tongue 26 remains against whichever stop 31, 32 it happened to be hearing on when the final impulse was prolonged,

and the spring 64. aided by the spring 139 (Fig. 3) restores to normal position the armatures 50 and 138.

For the purpose of inking the type wheel an inking roller 140 (Figs. 1 and 6) is provided having a facing of spongv rubber or equivalent material in contact with the type. This roller is removably journaled in a pair of arms 141 depending from the sleeve 51. By means of a spring 142 the knife-edge shaft 50, on which the sleeve slides, is urged counterclockwise (as viewed in Fig. 6) thereby holding the inking roller lightly against the type wheel. Mounted on the frame plate 12 is a tubular ink reservoir 143 provided with a brush-like wick 144 in the path of the inking roller, so that as the roller passes the. wick it will be smeared with ink which is drawn up from the reservoir by capillary attraction.

The unison device provided is of, simple construction and is illustrated in Figs. 1 and 2. Around the shaft 16, between the scape wheel 25 and the stop 33, a short piece of wire 145 is wound helically, with its turns spaced as shown to constitute screw threads. These threads engage the lower edge of a horizontally and vertically movable arm 146 which extends over a pin 147 projecting downwardly and laterally from an arm 148 on the armature shaft 39. As the shaft 16 rotates to set the type wheel the thread 145 carries the arm 146 toward the left' (as viewed in Fig. 2), but each time the armature 49 is depressed the arm 148 and pin 147 are raised, lifting the arm 146 out oil engagement with the helix or thread and allowing the spring 149 to swin the arm rightwardly to initial position. I ,however, the type wheel should, without printing, be revolved several times, say twice for example, the leftwardly extending-pin 150 om arm 146 is carried into the path of the finger 151 on the shaft 16; said finger being in the, present instance merely the projecting end of wire 145. The type wheel shaft now cannot rotate until. printing is effected, which latter operation of course leaves the receiver in unison with the distant transmitter.

It is desirable, though not essential, that the machine should not operate to space the type wheel along the shaft 16 when the paper is not in position to receive impressions, as such operation would merely result in smearin the platen with ink. To prevent this resut an arm 152 (Figs. 2 and 6) is provided, mounted loosely on the sleeve 51 and projecting upwardly therefrom. This arm rests by gravity on the paper. When, gwithout the paper being in place, the type wheel is returned to its leftward or initial position the arm drops rearwardly past'the left end of the platen '97, and hence prevents rightward movement of the type wheel, even though current for such movement be sent through the machine. If, however, the

aper' is in place, the edge thereot'toveriiangs the end of the platen and so prevents the arm drop ing past the same, leaving the type wheel free to travel. below the platen the arm 152 is provided with two lugs 153, 154, which serve to bend the paper more sharply over the platen and to prevent thefpaper bulging out into contact with the type wheel. The forward swing of the arm 152, as the platen carries. the aper against the type wheel, is limited by tlie's'haft 16 in the path of a finger 152' on the said arm, so that by no 'ossibility can the lugs 153, 154 move toward the type wheel far enough to let the paper come into contact therewith above and below the platen. v

The four magnets and the circuit therefor are shown diagrammatically inFi 9. Any convenient and suitable transmitter can be employed which is capable of sending im ulses of either polarity at will, and a simp ea paratus for the purpose is illustrated in otted lines in Fig. 9. The transmission circuit, re resented by the wires 155, 156, is connecte to two keys '157, 158, marked and respectively, playin between two conducting bars 159, 160, wit the upper of which both keys are normally in contact. Depression of key 157, out of contact with the upper bar and into contact Above andwith the lower, will therefore send a current impulse from the battery 161 to wire .155.

Similar] depression of key 158 will send an impu se to wire 156.

he operation of the various parts of the machine having already been explained in detail further description is deemed un; necessary The machine herein specifically illustrated and 'described has proved satisfactory in practice and is the form preferred, but

vthe invention is capable of embodiment in" other apparatus without departure from its proper spirit and scope as defined by the following claims.

I claim 1. In a printing telegraph receiver, in combination, type wheel setting means includin an actuating electromagnet; a ci'r-. cuit t erefor; mechanism for taking impressions from the type wheel including an 1 overloaded elect'romagnet in said circuit; and a power electromagnetin the same'ci cuit and operatively connected with the said mechanism.

2. In a printing telegraph receiver, in combination, type wheel-setting means, including an electromagnet; mechanism for takingimpressions from the t pe wheel and mechanism for effecting the letter spacing, including an overloaded electromagnet in circuit with the first named ma st; and a power electromagnet in circuit with the first named and operatively connected with the said mechanisms.

3. In a printing telegraph receiver, in combination, type wheel setting means, including an electromagnet energi able by current of either polarity; rinting'mechanism, including an overloa ed electromagnet energizable by current of either 0- larity; a power electromagnet having a re iatively large time-constant and energizable by current of either polarity; and asingle energizing circuit for all said electromagnets.

4. In a printing telegraph receiver, in combination, a type whee means for rotating the type whee step by step, including an electromagnetic escapement operating on current of alternating polarity; printing mechanism, including an overloaded electromagnet energizable by current of either polarity; a power electromagnet of relatively lar time constant and energizable by current of either polarity and a single energizing circuit for all the electromagnetic instrumen-- talities 5. In a printing telegraph receiver, in combination, a ty 0 wheel; means for settin the same to ring a desired character to t e impression point; mechanism for shifting the ty e wheel from an initial osition to effect t 0 letter spacing; mechanism for returning the type wheel to its initial position; an overloaded elcctromagnet associated with said mechanisms to actuate the same; a power electromagnet of relatively large timeconstant in circuit with the first named magnet; paper feedmechanism to effect the line spacing; an actuating electromagnet therefor, and normally out of cir cuit with the first two named electromagnets; and means for cutting the last named magnet into circuit with the first two when the type wheel returning mechanism actuated.

6. In a printing telegraph receiver, in combination, a type wheel movable step by step from an initial position to effect the letter spacing and mechanism for returning the type wheel to initial position, including an electromagnet; paper feedin mechanism to efi'ect the line spacing, inclu ing an electromagnet normally out of circuit with the first named magnet; and automatic means to cut the paper feeding magnet into circuit with the type wheel returning magnet when the type wheel is returned to initial position.

7. In a printing telegraph receiver, in combination, a type wheel movable step by step from an initial position to effect the letter spacing and means for returning the type wheel to initial position, including an electromagnet; an energizing circuit for Said magnet; paper feeding mechanism to effect the line spacing, including a normally short-circuited electromagnet to actuate the same; and means to break the short circuit and thereby include the last named magnet. in the circuit, when the t pe wheel returning mechanism is actuatedi 8. In a printing telegraph receiver, in combination, a type wheel movable step by step from an initial position toefl'ect the letter spacing; mechanism for returning the type wheel to initial position, including an electromagnet; an energizing circuit therefor, having a air of normally closed contaets; paper .eeding mechanism to effect the line spacing, including an electromagnet having its terminals connected to said contacts; and means, actuated by the type wheel returning mechanism, to separate said contacts and thereby include in said circuit the paper feeding magnet.

, 9. In a printing telegraph receiver, in combination, atype wheel movable step by step f'roman initial position to effect the letter spacing and mechanism for returning the type wheel to initial position, including an electromagnet; an energizing circuit therefor; automatic means acting when the type wheel reaches the limit of its travel. to set in operation the type wheel returning mechanism; paper feeding mechanism, including an actuating electromagnet, to effect the linefspacing; and mechanism, actuated by the said automatic means, to cut into the energizing circuit the said actuating electromagnet, whereby the paper feeding mechanism will be actuated.

10. In a printing telegraph receiver, in combination, a type wheel rotatable to bring a desired character to the impression point; an electromagnetic escapeme'nt actuated by current of alternating polarity to control the rotation of the type wheel; mechanism for justifying the type wheel at the impression point; mechanism for taking impressions from the type wheel; mechanism for shifting the type wheel axially to efl'ect the letter spacing; an electromagnet in circuit with the electromagnetic esca ement and me chanically connected with tiie said mechanisms and energizable by current of eithei polarity but of its own power incapable of spring; mechanism for justifying the type wheel at the impression point; mechanism for taking impressions from the type wheel; mechanism for shifting the type wheel axi ally to effect the letter spacing; an electromagnet mechanically connected with said mechanisms, the magnet being in circuit with the electromagnetic escapement and energizable by current of either polarity but of its own power incapable of actuating said mechanisms; and a power electromagnct in circuit with the first named, mechanically connected therewith and energizable by a prolonged current impulse of either polarity.

12. In a printing telegraph, in combination, a type wheel shiftable axially to effect the letter spacing; mechanism for shifting the type wheel; mechanism for taking impressions from the type wheel; an electromagnet having an armature connected with said mechanisms, said electromagnet being of its own power incapable of actuating its armature to operate the mechanisms mentioned; a power electromagnct of larger time constant in circuit with the first, and having an armature; and mechanism linking the armatures together to compel them to operate simultaneously. I

13. In a printing telegraph receiver, in combination, a rotatable type wheel shiftable axially to efi'ect.the letter spacing;

mechanism; including a ratchet and an actu;

from the ratchet; a movable member in the the type whee path of the actuating pawl; and means rotated by said reversing means to hold the movable member stationary so as to disengage the pawls from the ratchet when the printing wheel has been shifted to the limit of its lateral movement.

14. In a printing telegraph receiver, in combination, a typewheel shaft; a type wheel -slidably mounted on the shaft and.

rotatable therewith; an electromagnetic escapement controlling the rotation of the shaft; electromagnetic mechanism for advancing the type wheel on its shaft from an initial position to effect the letter spacing, saidmechanism includin a ratchet, an actuating pawl, and, a holding pawl for the ratchet; a, spring tensioned by the advance of the type wheel and serving to return the type wheel to initial osition when the said pawls are disengaged from the ratchet; a movable member arranged in the path of the said ratchet-actuating pawl and serving to cause disengagement of said pawl from the ratchet when said member is held stationary; means positioned in the path of said member by suitable rotation of the type wheel shaft, to hold the member stationary;

'and means operated by disengagement of the actuating pawl from the ratchet to release the holding pawl from the ratchet.

15. In a printing telegraph receiver, in combination, a type wheel shiftable axially from an initial position. to effect the letter spacing; mechanism for shifting the type wheel, including a ratchet, an actuating pawl and a holding pawl therefor; a spring serving to return the type wheel to initial position when the said pawls are disengaged from the ratchet; an electromagnet associated with the actuating pawl to actuate the same and advance the type wheel; mechanism for advancing the paper to effect the line spacing; an actuating electromagnet, associated with the last named mechanism and normally out of circuit with the other magnet; and means operable at will to simultaneously cause release of the said pawls from the ratchet and out said actuating magnet into circuit with the first.

16. In a printing telegraph receiver, in combination, a type wheel, mechanism for advancing the type wheel from an initial position to effect the letter spacing, including a ratchet, an actuating and a holding pawl therefor a spring serving to return it to nitial position when the pawls are disengaged from the ratchetpan electromagnet associated with the actuating ratchet.

pawl to actuate the same; mechanism for advancing the paper to effect the line spacing; an electromagnet associated with the paper advancing mechanism to actuate the same; a pair of normally closed contacts in circuit with the first named magnet and connected with the terminals of the last named magnet; a lever connected at one end to said holding pawl to release the same from the ratchet and having its other end adapted to separate said contacts whereby to cut the second named electromagnet into circuit with the first; means serving to cause disengagement of the actuating pawl from the ratchet; and means connecting the actuating pawl and said lever, to actuate the latter when the said pawl is disengaged from the 17. In a printing telegraph receiver, in combination, a letter-spacing ratchet; a reciprocatory actuating pawl therefor, having a cam edge; a stop in the path of the cam elge and normally movable idly therewith; devices for holding the stop stationary whereby the cam edge cooperating with the I stop will disengage the pawl from the ratchet, said devices being normally movable with the stop; a spring tending to reversely rotate the ratchet; a holding pawl associated with the ratchet to prevent such reverse rotation when the actuating'pawl is advanced; alever associated with the hold ing pawl to disengage the same from the ratchet; a link connecting the actuatingpawl and the lever whereby to actuate the latter and cause release of the holding pawl when the actuating pawl is disengaged from the ratchet; and means operable for pre'- venting movement of the said stop-holding devices. 18. In a printing telegraph receiver, in combination, a letter-spacing ratchet; a pivoted reciprocatory pawl to rotate the ratchet in one direction, and having a camedge; a spring tending to rotate the ratchet in the reverse direction; a pawl to hold the ratchet from reverse rotation; a pivoted arm having a stop pin in the path of the said cam edge; a lever associated with the holding pawl to disengage thesame from the ratchet; a link pivotally connected to the lever and the actuating pawl, whereby the link swings idly as the pawl reciprocates but actuates the lever to release the holding pawl from the ratchet when the actuating pawl is swung out of engagement with the ratchet; and means for preventing pivotal movement of said arm, whereby to hold the stop pin' stationary in the path of the cam-ed e, causing the actuating pawl to ride up on t to pin and to be disengaged from the ratchet. 19. In a printingitclegraph receiver, in combination, a rotatable type wheel, shiftable axially to effect the letter spacing; mechanism, including a ratchet and an acfor revcrscly rotating the ratchet to retract the disk, and a stop carried by the disk adapted to be interposed in the path of the 15 movable member so as to cause the pawls to be disengaged from the ratchet when the type wheel has been shifted to the limit of its lateral movement.

In testimony whereof I afiix my signature 20 a holding pawl cooperating with the ratchet; an electromagnet associated with the actuating pawl to operate the same; a I circuit for said electromagnet; means ten-- sioned during the shifting of the type wheel I tuating pawl, for shifting the type wheel; I

the type Wheel when said pawis are disenin the presence of two subscribing witnesses. gaged from the ratchet; a movable nminncr GEORGE s HILTZ in the path of the actuating pawl; 21 wheel I rotated by the reversin means; a loosely Witnesses:

mounted disk adjacent i120 wheel, the latter M. LAWSON DYER,

after a partial rotation thereof engaging! S. S. DUNHAM.

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