US680693A

US680693A - Printing-telegraph.

Info

Publication number: US680693A
Application number: US1266000A
Authority: US
Inventors: John Burry
Original assignee: Individual
Current assignee: Individual
Priority date: 1900-04-13
Filing date: 1900-04-13
Publication date: 1901-08-20
Anticipated expiration: 1918-08-20

Description

No. 680,693. Panama Aug. 20, I90].

.1. BUBJRY.

PRINTING TELEGRAPH.

[Application filed Apr. 13, 1900.)

(No Model.) l5 Sheets-Sheet I.

O x N Q & N V @E N x \Q Q 1\ k N S Q3 WITNESSES:

TNE 50am: PE'IERs co PHOTO-HTML WAININUYON, 01c.

N0. 689,693. Patented Aug. 20, mm.

J. BURRY.

PRINTING TELEGRAPH.

(Application filed Apr. 13, 1900.; (No Model.) 15 Sheets-Sheet 2.

WITNESSES: INVEN TOR:

By M P" Patented Aug. 20, I90l. J. BUBBY.

PRINTING TELEGRAPH.

(Application filed Apr. 13, 1900-) l5 Sheefs8heet 3.

(No Model.)

R w) J m m SN g g g MS NS g 5 his Attorney QN Q N% WITNESSES: 61%

m: unams Prrzns co., PHOTO-LITHO., WASHINGTON. o. c.

No. 680,693. Patented Aug. 20, I90i.

Jl. HURRY.

PRINTING TELEGRAPH.

{Application filed Apr. 18, 1900-) (-No Model.) 15 Shaets-Sheet 4.

WITNESSES: INVENTOR:

' By his Attorney M S No. 680,693. Patente d Au 20, l90l.

J. sunnv.

PRINTING TELEGRAPH.

(Application filed Apr. 13, 1900,) (No Model.) l5 Sheets-Sheet 5,

WITNESSES: INVENTOR: %dz% 2,

Patented Aug. 20, IQM. J. BURRY.

PBINTHNG TELEGRAPH,

(Application filed Apr. 13, 1900.)

I5 shaots sheot 6.

(No Model.)

N 3 EN NQ NL NL WITNESSES:

INVENTOR -rm: mums PEYERs m PHOTO-Lin). wuumcvou, v.12.

No. 680,693. Patented Aug. 20,1901.

.B. HURRY.

PRINTING TELEGRAPH.

(Application filed Apr. 13, 1900.

(No Model.) l5 sheets-Shan WITNESSES: INVENTO'R:

y lzz's Attorney No. 680,693. Patented Aug. 20, IQOL J. BURRY.

PRINTING TELEGRAPH.

[Application filed Apr. 18, 1900.) (No Model.) [5 Sheets-Shaet 8:.

WITNESSES: wmv NTOR: 2% d r m By his Altornj I No. 680,693. Patented Aug. 20, l90l. J. BURRY. PRINTING TELEGRAPH.

(Application filed Apr. 13. 1900.)

I5 Sheets-Sheet 9.

(No Model.)

INVENTOR: By 25 Aftom% MW/V IIIIIII No. 680,693. Patented Aug. 20, NW.

' J. BURBY.

PRINTING TELEGRAPH.

(Application filed Apr. 13. 1900.) mi Model.) l5 Sheets-Sheet 13.

vllkw I """"iiiiii W \x NTOR his Ale-army No. 680,693. Patented Aug. 20, I90l. J. BURRY.

PRIN'HNG TELEGRAPH.

(Application filed Apr. 18, 1900.)

l5 Shebts-5heet l4.

(No Model.)

INVENTOR:

\VITNESSES er By his Alma nay n4: scams PETERS p0, worn-mm w-sr msm o. c

.5. HURRY. PRINTING TELEGRAPH.

Pa'tented Aug. 20, I901.

(Application filed Apr. 18. 1900.)

I5 Sheets-Sheat l5.

' (No Model.)

WITNESSES:- 5%! M Warren firarns Parana @rrrca JOHN HURRY, OF FORT LEE, NEl/V JERSEY.

PRINTING-TELEGRAPH.

SPECIFICATION forming part of Letters Eatent No. 680,693, dated August 20, 1901. Application filed April 13, 1900. Serial No. 12,660. (No model.)

To all whont it may concern:

Be it known that I, JOHN BURRY, a citizen of the United-States, and a resident of Fort Lee, in the county of Bergen and State of New Jersey, have invented a certain new and useful Improvement in Printing-Telegraphs, of which the following is a specification.

The present invention relates more particularly to receivers for use in printing-telegraphs, though some of its combinations are capable of use elsewhere.

The general object of the invention is to increase the speed and efficiency of such apparatus.

Among the specific objects are, first, the increase of the speed of rotation of a powerdriven escapement-controlled type-carrier as compared with similarly-operated type-carriers, the number of type spaces in a circular row of type being equal in each case; second, the arrest of a power-driven rotatory type-carrier in given positions less in number than the type-spaces in a circular row of type on said carrier and the independent motion of rotation of said carrier to bring to the printing-point type in said row that are not brought thereto or stopped thereat when the carrier is arrested as stated; third, the printing of lines across a page or web; fourth, the release of a traversing type-carrier at any position in its letter spa-cing movement to be automatically returned to an initial position for the beginning of a new line; fifth, the improvement of the inking of the type; sixth, the reduction of the resistance of the inker to the rotation of the type-carrier; seventh, the supply of ink from a stationary reservoir to a to'and-fro-moving inker; eighth, automatic line-spacing; ninth, to secure uniform distances between lines; tenth, to render the impression mechanism inactive during the return of the carrier to said initial position; eleventh, to bring a type-carrier which moves for letter-spacing to unison at one point in its traverse; twelfth, to control the actionof the printing-magnet by the joint action of magnets in different circuits, said magnets acting simultaneously or dissimultaneously; thirteenth, to wind the spring for drivingthe type-carrier; fourteenth, to feed the paper byspring-power; fifteenth, to wind the paper-feeding spring automatically; sixteenth, to space between words without turning the type-carrier to any particular positiont'.' 6., in any position of the type-carrierand other objects, as will hereinafter appear.

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

The preferred form of the invention is illustrated in the accompanying drawings, forming part of this specification, in which- Figure 1 is a front elevation, certain parts being omitted for the sake of clearness. Fig. 2 is an end elevation taken from the left in Fig. 1. Fig. 3 is a plan view, certain parts being omitted for the sake of clearness. Fig. t is an end elevation taken from the right in Fig.1. Fig. 5isa vertical sectionalviewfrom the left and just inside the left vertical end plate of the frame, certain parts being omitted for the sake of clearness. Fig.6 is a sectional plan view, upon no particular plane, showing the general relation and operation of certain parts. Fig. 7isavertical sectional view from the right-hand end and taken just inside the right vertical end plate of the frame, certain parts being omitted for the sake of clearness. Fig. Sis a detail view of an adjustingdevice. Fig. 9 isadiagrammatic view of the circuits of the apparatus and also showing (in dotted lines) an arrangement of circuits connecting with a central or transmittingoffice. Fig. lOisaperspectiveviewshowing the typewheel and certain connected parts and a centering device for the typewheel in their positions at the instant of the arrest of the type-wheel and just before the centering device begins to act. Fig. 11 is a like view showing the action of the centering device for selecting one of two printing positions of the type-wheel. Fig. 12 is a like view showing the action of the centering device for selecting the other of the two printing positions of the type-wheel indicated in Figs. 9 and 10. Fig. l3 is a detail View. Fig. 1% is a view from the left showing the positions of certain parts at the moment an impression is made upon the paper by the type-wheel and platen. The normal positions of said parts is shown in Fig. 2. Fig. 15 is a similar view showing the positions of certain parts,

just prior to the release of the type-wheel, the parts being partially positioned for that end. Fig. 16 is a similar View showing the positions of certain parts at the moment the type-wheel is released and during its return to the place for beginning a new line. ig. 17 is a detail sectional view, with parts omitted, of the devices for keeping the paper under tension. Fig. 18 is a detail longitudinal sectional view of connections between the type-wheel and the escapement. Figs. 19 and 20 are detail views of an ink-roller. Fig. 21 is a view of a modified form of circuit-com trolling means and operating devices therefor. Fig. 22 is a diagram showing an arrangement of the circuits corresponding to the modification shown in Fig. 21. Fig. 23 is a view of circuit-controller; operating devices therefor, and a modified form of means for preventing the operation. of the platen when the type-carrier is being returned to an initial position. Fig. 24 is a diagram of a modified arrangement for energizing the printingmagnet. I

The framework shown in the drawings con1= prises a base-plate a, preferably of insulating material, parallel vertical plates b a d, which are secured to plate a, two steel plates 6, connecting plates 17 c d, tie plates or bars fg h, connecting plates 0 d, a tie-rod 7c, connecting the plates b d, and certain adjuncts hereinafter more fully described. The parts of the framework, except the base a, are of metal and are secured together firmly by screws Z and by removable dowels m to form a rigid structure. Not all of the securing-screws and dowels are shown in the drawings.

Type-positioning mecham's'm.-According to the present invention the type are arranged on a rotatory carrier, which by preference is a wheel or disk having the type on the periphery thereof, and the carrier is moved about its axis and is arrested in given positions less in number than the type-spaces in acircular row of type thereon by a suitable driving and arresting means. The type in each circular row on said carrier are, so far as possible, arranged in groups of those letters which in any particular class of work, as stock-market and news reports, occur most frequently in combination with each other. In some cases the whole row of type may be in such groups, but in general there are type which cannot be so grouped except by duplicating particular type. In the first-named cases the number of said given positions is an exact divisor of the number of type-spaces in a circular row of type, or, stated differently, the number of said given positions is equal to the number of groups of type. As will be seen hereinafter, the members of each group of type may be printed in all possible orders without rotating the carrier beyond the limits of said group after it is once arrested for printing from a member of such groupsthat is to say, the carrier is not moved from letter toletter, but from group to group, thus gaining speed, and the type of each group which are not arrested at the printing-point are brought thereto by means preferably separate from those by which the carrier is rotated and arrested in said given positions. It is more convenient, however, to treat all the type as being in groups and to arrest the carrier in given positions equal in number to said groups, as it involves a simpler construction and mode of operation to have uniformity of action in all cases than to have one mode of operation for one part (the groups of letters occnrringin combination) and another for the remainder. In the latter case the given positions named might not be an exact divisor of the number of type-spaces in a row of type on the carrier, though they would still be less in number than said spaces. In order to bring to the printing-point type in said groups not brought thereto or stopped thereat by the driving and arresting mechanism, means are provided for giving a supplemental motion of rotation to the carrier within the limits of the group independent of the motion of rotation given by the driving mechanism aforesaid, said supplemental-motion means preferably acting as or after the carrier is arrested in any of said given positions. In some methods of driving and arresting the carrier the supplemental-motion means may coact with a part of or a part connected with the arresting means, though it is preferable, for reasons connected with simplicity of construction and operation, that the means for communicating the supplemental motion of rotation to the carrier be independent of the means for arresting the carrier in said given positions. In the first case there is a yielding connection between the driving and the arresting part of the means, while in the second case the 'yielding connection is preferably between the carrier and the arresting means. In both cases it is preferred that the yielding connection be also resilient or contain a spring or springs (spring member) in order that the carrier may be returned to a normal position with respect to some part of the driving or arresting means irrespective of any motion of the latter. In some forms of driving and arresting means for the type-carriers of printingtelegraph instruments the two functions are performed by one and the same apparatus. In using such a driving and arresting means in connection with the present invention the yielding connection is between such means and the type-carrier. The supplemental-motion means may be of various forms and modes of operation, each adapted more or less to secure the ends in view. In a simple and convenient form of said supplemental-motion means there is included a member connected to said carrier to rotate the same, said memher being provided with a plurality of engaging or operating parts less in number than the type-spaces in a circular row of type on said carrier and a member movable into and out of engagement with said parts to rotate the carrier independently of the driving means in order to bring to the printing-point type in said row that are not brought to or stopped at said point by the arresting means. Said multiple -part or first-named member may be in the form of a pinion or other toothed wheel, a star-wheel being used by preference,

and the member movable into and out of en-- gagement therewith may do so every time an impression is to be taken or only when the type-carrier is to be moved to bring to the printing-point type that are not brought to or stopped at said point by the arresting means and it is desired to print from such type not so arrested. In case the type-carrier is to be shifted both forward and backward in order to bring to the printing-point type which are not brought thereto by said driving and arresting mechanism, the said shifter-mechanism member, which is movable on the framework, is given a motion additional to that by which it is moved into and out of the path of the first-named member or that connected to the type carrier, so as to determine which of the supplemental forward and backward motions of the carrier shall be had on any particular occasion. In order to simplify the construction and operation of the mechanism as much as possible, I prefer to arrange all the type in groups of two and to arrest the type-carrier in positions such that the print ing-point shall always lie opposite the inter vals between the members of successive pairs orgroups of type on the carrier, the unison or blank space counting as a member of such a pair, and to give the type-carrier supplemental motions forward and back after it has been arrested by its driving and arresting mechanism in order to bring the type to the printing-point, whence it follows that in this instance the number of positions in which the carrier is arrested by its driving and arresting mechanism is one-half the number of type-spaces on the carrier or is equal to the numbers of pairs of type above referred to. The same statements as to numbers hold true also in the case where the type-carrier is stopped by its driving and arresting mechanism with type at the printing-point and the carrier is given a supplemental motion forward or backward to bring the remaining half of the type to the printing-point. Vhen type are brought to the printing-point by said driving and arresting mechanism and other type forward and back or at each side of those so brought to said point brought thereto by supplemental motion of the typecarrier, the said given positions are one-third as numerous as the type-spaces in a row of type and equal the groups in number. In practice, however, it is more advantageous to arrest the carrier in the first instance at the intervals between the members of each of the successive pairs or groups of type and to move the carrier both forward and backward to bring the type to the printing-point.

In order to insure that the type shall be in proper position at the printing-point for the giving of impressions, any suitable centering means may be employed. I prefer to combine the functions of centering and of shifting the carrier in one and the same mechanism, as such combination involves a simpler and more effective construction and mode of operation than is possible when these functions are performed by separate or independent devices. The single apparatus can be worked faster than two apparatuses, since in the latter case one has to wait for the other to do its work before the first can act.

Referring now to the drawings, the type are on the periphery of a metal disk or wheel t, and, by preference, are of soft rubber. The wheel '6 is rigidly secured to and is carried by a sleeve 11, which is adapted to slide along but which cannot turn independently of a triangular or other polygonal shaft 0. The said shaft is journaled at its ends in arms or brackets jin a manner such that it has no endwise motion. The bracketsjare secured to the plates 1) d in such wise that they may be removed when desired. By preference the shaft 0 is triangular in section and the sleeve n is provided with internal longitudinal grooves for engagement with the corners of the shaft 0 and also with a very small part of each of the faces thereof. The shaft 0 extends beyond the bracketjat the plate d and is there bored out axially to form a seat or bearing 1 for the reduced end of a shaft 4 of driving and arresting mechanism. The other end of the shaft 7' is journaled in a bracket a, projeoting from and removably secured to the plate 0. The shaft rhas no endwise motion. The shaft T has a scape-wheel 8 fast thereon, and also a pinion 2; fast thereto at a point between the Wheel and the arm it, while the shaft 0 has a star-wheel to fast thereto on that side of plate (Z which is next the scape-wheel s. Pins or arms my, respectively, fast to the wheels 3 and to, project therefrom each toward the other of said wheels, said pins being at different distances radially, so as not to interfere with each other, but being long enough to overlap, as shown. The wheel to has a circular row of holes .2, into any one of which holes the pin y maybe inserted. The holes 2 exceed by one in number the number of teeth on the wheel to. Two springs 1 2 are coiled around the shaft 1" and have their ends projecting radially, as shown, the friction between the coils of the springs and the shaft being sufficient to retain them in any position. They may be adjusted about the shaft by pressing on their ends in such wise as to loosen the grip of their coils upon the shaft r and to move them in the required direction. The adjacent ends of the springs l 2 bear against the pins 00 y at opposite sides at the said overlapping parts thereof and keep the pins in a relatively-fixed position, while permitting of motion of one relatively to the other. The number of teeth on the wheels 8 and w is equal, and the number of type plus the unison space on the type-wheel i is double the number of teeth on each of said wheels 8 and w. The scape-wheel sis always arrested with one or another of its teeth in a given position, at which time the type-wheel iis so placed with respect to the printingpoint as that no type thereon is opposite the printing-point, but said point is opposite the interval between some two type or type-spaces on the type-wheel. The described connection between the scape-wheel s and the star-wheel w, hereinafter referred to as a centering shift-wheel, permits of a motion forward or back of the type-wheel to supplement the action of the driving and arresting mechanism and bring the selected type to the printingpoint. This supplemental or shifting motion is communicated to the type-wheel by the centering shift-wheel, the shaft 0, and sleeve 'n in the particular case illustrated in the drawings, but it may be otherwise communicatedwithout departing from the scope of this invention.

The means for actuating the Wheel 10 to cause the shift of the type-wheel includes a shaft 4, which is journaled in the plates 0 d near the upper rear corners thereof, an arm or lever 5 fast to said shaft 4 and extending forwardly and downwardly, and an arm 6, pivotally connected with the free end of the lever 5 and constructed to coact with the wheel in for the purposes of shifting the typewheel and then centering it. The arm 6 may be swung about the pivotal point of connection with the arm 5 by means of any suitable switching device which will divert the working part of the arm 6 into one or another of the required paths. A convenient form of such a switching device comprises a slotted or recessed portion, a switching-tongue mounted and having a swinging motion in said slot, and a pin or stud projecting into the slot and going to one side or the other of said tongue when the two parts have relative motion. The slotted tongue-provided portion or element and the pin or stud are placed one on a fixed part of the framework and the other on the arm 6. In the instance shown in the drawings the arm 6 is slotted and has the tongue, while the pin is on the fixed framework; but this arrangement may be inverted. The centering shift-arm 6 is V-shaped at its free or working end and is provided with a longitudinally-extending through-slot 7, which is also V-shaped at that end next the centering shift-wheel, the said V of slot 7 terminating in a straight slot, into which a round pin 8 projects, said pin 8 being fast to plate (1 or a part connected therewith. l/Vithin the slot 7 is placed a movable tongue 9, the lower end of the tongue being rounded to have a bearing in the rounded lower end of the slot 7. The tongue 9 is held in position by two pins 10, which lit tightly in holes through the arm 6 and pass through slots 11 in the tongue without binding and which permit of a pivotal motion of the tongue about its rounded end. That end of tongue 9 which is adjacent the V-shaped end of slot 7 is itself V-shaped and is at a distance from the end walls of slot 7 such as will permit of the easy passage of pin 8 on either side of the tongue. The tongue 9 and the adjacent side wall of the slot 7 form a groove or slot of a size such that the pin 8, coacting therewith, guides the centering shift-arm 6 accurately to one side or the other of its central position, according to the position of the tongue 9 in the slot 7 aforesaid. The tongue 9 has a pin 12 fast thereto and projecting from its side, and a fork 13 at the end of an arm 14 coacts with said pin 12 to move the tongue to one side or the other of the slot 7, as indicated in Figs. 11 and 12. The .V- shaped end of arm 6 is normally out of the path of the teeth of wheel 10 and when operated strikes one or the other of the two adjacent teeth of said Wheel and turns the wheel w, shaft 0, and t-ype-wheelt forward or back until the other said adjacent tooth of thewheel w is arrested by the V-shaped end of the arm, and the type-wheel thus centered is brought to rest with one or the other of the said two type at the printing-point. The conjoint action of the arm 14, slotted arm 6, tongue 9, pin 8, and the lever 5, the arm 14: moving first, whereby the arm 6 is given a compound motion, is sufficient to determine which of any two type adjacent the said printing-point shall be brought thereto and in what order. The printing-point is indicated in Figs. 10, 11, and 12 by the dotted line. The row of holes ,2 and the adjustable pin y provide means whereby the position of the kerfs of the wheel w may be adjusted with very great accuracy and ease with relation to the V-sh aped end of the arm 6, which is not adjustable because the pin 8 is not easily adjusted. The type-wheel t is adjustable about the sleeve it by means of a set-screw. The arm 6 is shouldered at its pivoted end and is held in place between parallel bearing-arms of the lever 5 by a pin 16, which is provided with a circumferential groove. The

pin or axis 16 is parallel with the shaft or axis 4, or substantially so. The free end of a wire spring 17 rests in said groove and retains the pin in place. The spring 17 is made fast in any suitable way to the lever 5.

Means whereby the lever 5 and the arm 14 are operated will be described hereinafter.

Driving and arresting mechanism. In the machineillustrated in the drawings the power for rotating or driving the type-wheeltis derived from an automatically-wound mainspring and is transmitted to the scape-wheel 3 through the pinion '0 and a gear 18, which meshes with the pinion. The gear 18 is loose upon a shaft 19, which is journaled in the end plates 1) c and passes freely through a large opening in the plate d. A drive-spring 20 is coiled about the shaft 19 and a sleeve 21, to which the gear 18 is fast, and has its ends free, except that the end adjacent the gear 18 bears against a pin 22, projecting from the side of the gear, and that its other end is held frictionally by a round part on the shaft 19. By preference the spring 20 is so placed or wound that it is untwisted or unwound as it is put under tension and that it is closed up or its coils decrease in diameter as it expends its force in driving the gear 18, as by this arrangement there can be no overwinding of the spring, for its openingcoils will slip on the round on the shaft 19 whenever the spring has been put under a given tension by the spring-winding apparatus. By preference there is, relatively speaking, considerable clearance between the coils of the spring 20 and the shaft 19, except at the ends of the spring, one end being caused to grip the shaft with considerable force in orderto provide forslipping effect at the righthand end of the spring.

The shaft 19 has a fly-wheel or momentum device 23, fast thereto, and also a ratchetwheel 24, the latter being outside the plate 0. The shaft 4 above named is provided with a lever or arm 25, fast thereto, which arm extends forwardly and downwardly of the apparatus and has a pawl 26 pivoted thereto at its free end. A spring 27, secured at one end to the pawl 26, bears against the top of the lever 25 and is tensioned to keep the pawl in engagement with the ratchet-wheel 24. The motion of the arm 25 away from the Wheel 24 is limited in any suitable way, as by a bar 28, which is pivoted at one end at 29 to the plate 0 and is provided near its free end with a transversely extending notch 30, through which the body of a screw 31 passes and engages with a threaded hole in the plate a. The head of the screw coacts with the side of the bar 28 to bind the bar 28 against the side of the plate 0 and so look it against motion in any position. to which it may be adjusted within the limits provided. The fiat top of the bar 28 coacts with the fiat under side of the arm 25 to limit its downward motion.

The shaft 4, between the plates 0 d, is provided with an arm 32, fast thereto, and the armature of an electromagnet 34 is fast to the arm 32. The yoke of the magnet 34 is mounted on a bracket 35, which is fast to or integral with the tie-bar g of the fixed framework of the apparatus. ated to move the arms or

levers

5 and 25 downwardly and the arm 32 upwardly by a spring 36, which engages at one end with the extended pin 37, by which pawl 26 is fastened to arm 25, and at its other end with a hook 38 at the end of a wire spring 39. The spring 39 is wound about a round pin 40, projecting from the plate 0, and has its other end 41 extending away from said pin. The spring 39 is held in place on the pin by the friction between its coils and said pin, and it may be adjusted circumferentially of thepin in either direction by pressing upon that'end of the spring which will both loosen the coils of and The shaft 4 is opermove the spring in the required direction. In this way the position of the hook 38 relatively to the pin 37 may be varied, and thus the tension of the spring 36 may also be varied. Every time the magnet 34 attracts its armature 33 to itself the pawl 26 gives an impulse to the ratchet-wheel 24, the fly-wheel 23, and the shaft 19, thus causing the spring 20 to be wound or put under greater tension. The momentum device 23 continues the winding action of the shaft 19 for an interval of time after the pawl 26 ceases to act upon the.

ratchet-wheel 24. Means whereby the magnet 34 is energized from time to time will be described hereinafter. The ratchet-Wheel 24 is also rotated from time to time by a pawl 42, which is pivotally connected with a pivoted arm 43. The arm or lever 43 is fast upon a shaft 44, journaled in the plates 0 d. The shaft 44 has an arm 45 fast thereto, and the armature 46 of an electromagnet 47 is fast to said arm 45. The magnet 47 is supported by the soft-iron tie-bar and yoke f. A spring 48 is coiled about an extension of the pin 49, by which pawl 42 is connected with the arm 43 and is tensioned to keep the pawl 42 in engagement with the ratchet-wheel 24. The spring 48 may be adjusted about pin 49 in the same way as the spring 39 is adjusted, thus varying the tension thereof. The motion of the lever 43 in one direction is limited by the contact of the armature 46 with the core-stop 50 (of insulating material) of the magnet 47 and in the other direction by a stop 51 on the plate 0. The stop 51 is pivoted to plate 0 at 52 and is held in place by a screw 53 in substantially the same manner that stop 28 is held in place by the screw 31. The armature 46 is drawn away from its magnet 47 by a spring 54, which has its ends fast to arm 55, which forms an extension of arm 45, and to a cord which is Wound upon and is fast to a 1:0- tatable shaft 56. The shaft 56 is journaled in the plate a by a reduced end and is locked in any position by a screw 57 and a washer 58, said screw engaging with a threaded hole in the end of the shaft and jamming a shoulder or collar on the shaft against the inner side of the plate 0. The shaft 56 provides a means whereby the tension of the spring 54 may be varied by turning the shaft by means of the screw. The magnet 47 is energized from time to time, as hereinafter set forth. At each stroke of the lever or arm 43 downward the pawl 42 rotates the ratchet-wheel 24 and the parts rigidly connected with it, thereby winding or increasing the tension of the spring 20 in the manner hereinbefore set forth.

The type-wheel t is arrested by the scapewheel .9 and the pallet 3 and the described connections between the type-wheel and the scape-wheel. Any suitable escapement mech-- anism may be employed subject to the conditions hereinbefore mentioned as to the number of positions in which it arrests the typewheel. The escapement herein shown is sub-