US1385367A - Stbing-tbtjing machine - Google Patents

Description

Gm. N. EINSELE.

STRING THUING MACHINE.

APPLICATION min 1AN.22,191s.

1,385,367; Patented July 26, 1921.

3 SHEETS-SHEET l.

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G. N. EINSELE.

STRING mums MACHINE.

APPLICATION FILED IAN. 22. 1918. 1,385,367'` Patented' July 26, 1921.

3 SHEEIS-SHEET 3.

IIIIIII which,

.with the UNITED STATESl PATENT OFFICE.

` GEORGE N. EINSELE, 0F CEDAR LAKE, INDIANA.

1 STRING-TRUING MACHINE.

To all whom it may conce/'21:

Be it known that l, Grzonor: N. EINsnLE, a citizen of the Untied States` and a resident of the city of Cedar Lake, county of Lake, and State of Indiana, have invented certain new., and useful Improvements in String- Truing Machines, of which the following is a specification.

invention relates to a. string truing machine, that is a machine designed for use primarily in the truing of gut strings used in connection with stringed instruments,

In` order to obtain the best results upon a stringed instrument so far as the tonal productions are concerned, it is necessary' that the string employed be of uniform diameter from end to end or true, it being the object of my invention to produce a machine which will be capable of mechanically cutting or trimming musical instrument'strings with l great precision and rapidity.

A further object is the production of a machine of the character mentioned which will be of durable and economical constructionand efficient in use.

Other objects will appear hereinafter.

The invention consists in the combinations'and arrangements of parts hereinafter described and claimed. y

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in Figure 1 is a side elevation of a string truing machine embodying the invention,

Fig. 2, a sideelevation of the cutting elementand string holder included in the construction, the carriage of themachine being shown in section,

Fig. 3, a, front elevation of the same construction seen in Fig. 2,

Fig. 4, a` top plan View of the same construction seen in Figs. 2 and 3,

5, a section taken on line 55 of Fig. 4,

Fig. 6, a section taken on substantially line 6-f-6 of Fig. 5,

Fig. 7 a partiallysectional plan view of the means employed forlclamping and rotating the central portion of the string, the samebeing shown in cooperative relation parts of the Amachine seen in Fig. 4, andk Fig, a section taken on substantially line The' preferred form` of construction as Specification of Letters Patent.

Application med January 22, 191e.

Patented July 26', 19.21. serial No. 213,272.

vframe or bed 10, upon which are mounted bearing members 11 and 12, the former being rigidlysecured and the'latter a'djustably secured so as to permit of shifting ofthe same to accommodate strings of various lengths, as will be understood as the description proceeds.

Rotatably mounted in the bearing 11 and extending loosely through bearing 12 is a shaft 13 to which is fixed a pulley 13 adapted to be driven by a belt 13". Upon shaft 13 are mounted three gears 14, 15 and 16 of uniform size, the gear 14 being fixed to said shaft, and the gears 15 and 16 being splined on said shaft. Meshing with the gear 14 is a pinion 17 fixed to a shaft 18 mounted in bearing 11, said shaft carrying atone end a hook 19 adapted for engagement with one end of the string acted upon. Meshing with the gear 16 is a pinion 20 to whichl is splined a shaft 21 slidably mounted in bearing 12. The shaft 21 is provided at one end with a hook 22 adapted for engagement with the other end of the string acted upon. l To the rearward end of shaft 21 is swiveled an end piece 23 to which is fastened a cord or flexible element 24 which passes aroundachannel pulley 25, carrying at its lower end a weight 26 which is a-dapted toexert a pull upon the shaft 21 to the right, or in a direction which will cause the string arranged in the machine to be stretched taut.A

Mounted for recip'rocatory movement upon the bed or frame 1() is a carriage 27. Above said carriage is arranged an electric motor 28 mounted upon a bracket 29, the lower end of which is mounted for vertical adjustment in a guide or post 30 arising from said carriage." Upon one side of bracket 29is provided a lug 31 threaded upon a screw 32 which is rotatably mounted upon post 30, the arrangement being such that vertical adjustment of the motor may be effected through rotation of said screw, as will be readily understood. The upper end of said y of which is provided with radial cutting teeth, as clearly seen in Figs. 1, 2 and 3.

` The cutting element 34 is so arranged that when a-string is strung between theme11!- bers 19 and 22, the .cutting element will be adapted to contact therewith in order to trim or true the same. Arrangedr adjacent one side of said cutting element is a pair of jaws 35 carrying channel rollers 36 adapted to embrace the string acted upon between the same. The jaws 35 are fulcrumed at 37 to a tubular collar 38, one of said jaws being fixed against pivotal movement through fastening of the same to a second lug, as seen at 39 in Fig. 7. Engaging with the rearward ends of said jaws is an arched leaf spring 40, las, best seen in Figs. 7 and 8, which serves to press the movable jawA toward theI stationary one and thus to effect secure clamping of the string engaged. The collar 38 is fixed to a tube 41 which is mounted in a bearing 42 arising from carriage 27 .l

' Fixed to tube 41 is a pinion 43 which mesheswith the ear 15, the arrangement being such that wen said gear is rotated, the clamping jaws 35 will be revolved and thus serve to rotate the string therewith. The pinions 17, 20 and 43 are all of the same size and meshing with gears 14, 15 and 16 also'all of the same size, as above set forth.

upon rotation of shaft v13, the string arranged in the machine will be caused to rotate at the jaws 35 at. a rate of speed precisely the same as the speed of rotation at the ends of the string. Thev clamping of the string bysaid jaws is of sufiicient tension to prevent torsional yielding or twisting of the string when engaged by the cutting element, it lhaving beenxfound that without this provision, the central portion of the string, duringv the cutting operation, will twist and lag and then sudden y release or jump with thefresult that a non-uniform or uneven-cut-v ting of the string is secured. Through the use of the revolving jaws arranged in close proximity with the cutting element, the objection. or trouble just described is effectually'overcome and a string` of true and. uniform thickness produced.

Arising from the carriage 27 directly in front of the cutting element 34- is a bracket O r support 44 provided atits upper end with horizontally disposed plate 45, as clearly seen in Figs. 2,3, 4, 5 and 6. Slidably mounted upon plate 45 is a plate 46 adjustable toward and from the cutting element by means of a screw 47 provided at its outer'end with a crank handle 48, the inner end of said screw being threaded into a lug 49 depending from the plate 46 through an elongated slot-50 rovided in plate. 45 as seen 1n Flg. 5.' Slidalb y mounted upon the upper sideof plate 46 vis a `presser shoe 51, held in position by another plate 52 screwed to the plate 46, the plate 52 being formed with a channel for the accommodation of said shoe. as clearly seen in' Fig. 3. Movement of presser shoe 51 toward and from-the` cutting element is effected by means of an eccentric 53 operating in a slot 54 provided in said shoe, asclearly seen in Figs. 5 and 6. The eccentric is carried by a shaft 55 upon the upper end of which is loosely mounted a lever 56. Operative connection between said lever and shaft is effected by means ot an adjustable pawl 57 adapted for engagement with a toothed segment 58 fixed to said shaft. The pawl 57 is slidalble upon the underside of lever 56, the same being locked in positions of adjustment by means of a thumb nut 59 threaded upon a post 60 arising trom said pawl and passing through an elongated slot 61 provided in said plate, as clearly seen in Figs.A 2, 4 and To take up any lost motion between eccentric 53 and the presser shoe and maintain a constant contact between said eccentric and one end of the slot 54, a leat` spring 62 is provided in said slot which engages against the eccentric, as clearly seen in Fig. 6.

The arrangement is such, as will be seen, that shifting of the presser shoe toward and from the cutting element is effected by tilting of lever 56, and adjustment of said lever relative to said shoe may be. effected b v simply shifting the pawl 57 with relation to the toothed segment 58. The front end ot shoe 51 is slightly rounded as seen in Fig. 6, and the same is formed with a groove 51', as seen in Fig. 5. for engagement` with the string, the arrangement being such that, in the operation of the machine, the string will ride 1n the groove 51 and said presser shoe will constantly hold the same in engagement. with the cutting element.

In order to gage-the thickness or diameter of the string in the cutting operation, a shoe 63 is provided, the front end of which is adapted to engage withy the string before the same reaches the cutting element. Said shoe, as clearly seen in Figs. 4 and 6, is slidably mounted upon plate 46, the same being yieldingly held in its forward position by means of a leaf spring 64 which engages with a depending finger 65 arovided at the rearward end of said shoe. he front end of said shoe is adapted to press the string against a eooperating shoe or guide 66, the rearward end or shank 67 of which is adjustably secured tothe plate 45 by means of a screw 68 which is threaded into an upstanding lug 69 at the rearward end of said shank, said screw being rotatably adjustable in a lug 7 0 arising from plate 45. `A second screw 71 threaded into plate 45 and engaging with an elongated slot 72 in portion 67 of said shoe, serves as additional means. of securing the same in position.

Reti-action of the shoe 63 is effected by means of a laterally project-ing arm 7 3 provided atthe rearward end of said shoe which engages with a notch 74 provided in the adjacent Side of shoe 51, as seen in Fig. 6, the

arrangement being such that, upon retraction of shoe 51, shoe 63 will be also simultaneously retracted.

Coperating with the shoe 63 is an arm 75 fulcrumed at 76 upon the upper side of plat-e` 52. Theparm 75 is formed with a shoulder 77 which is adapted for engagement a. post 78 arising from the rearward end of shoe 63, a hehcal compression spring 79 interposed between lug 78" and a pin provided upon said arm being adapted to normally hold the shoulder 77 in engagement with lug 78. The spring 79, however, 1s very light so that the same will not at all affect the operation of spring 64. The rearward end of arm .75 is connected by means of a link 80 with lever 56, the latter being pro vided with a pin '.81 which loosely engages with an elongated slot 82 formed in said link. The rearward end of arm 75 is bent toward the lever 56 so as to be adapted to serve `as a stop as hereinafter described.

The arrangement is such that, in the operation of the machine, when the operator rocks the lever 56 to the right or in a direction to move the presser shoe 51 toward the cutting element, that is in a direction to press the string into engagement with the cutting element, the shoe 63 will move simultaneously with the shoe 51 under the influence of spring 64. The forward end of shoe 51 is shghtly in advance of the shoe 63 and therefore wlll contact with the string and press the same into engagement with the cutting element before the shoe 63 has pressed the string into engagement with the shoe or stop 66. When the latter occurs, however, movement of the shoe 63 will stop, the arm 75, having, in the meantime, been swung on pivot 76 by the lug 78 to ay certain position. `he operator will then continue to rock the arm 56 until the same just contacts with the rearward end of arm 75, the latter thus serving as a sort of guide or gage detei-mining the position of the shoe 51 and hence the thickness of the cut taken on the string. The shoe 51 is held in this position of adjustment simply through friction. By

reason of the shoe 63 being yieldingly'held in contact with the string, in the event of any bumps or other irregularities in the string, said shoe will be adapted to yield rearwardly without affecting the adjustment of' shoe 51. The front end of shoe 63 and the adjacent side of stop shoe 66 will be grooved to accommodate the string.

After the string has passed shoe 51 and the cutting element, the same is engagedby a guide 83the rearward end of which is adjustably secured b a sclew 84 to plate 45, as clearly seen in Pigs. 4 and 6. The member 83 is also grooved for engagement with the string. The members 66 and 83 will be so positioned that in the passing of the string into engagement with the front end of a shaft of shoer 51, the string will be required to belly at the shoe 51, this arrangement of course resulting in cutting of the string simply at the place. of registration` therewith of the said shoe 5l, inasmuch as the members 66 and 83 will serve to hold the string away from the/cutting element. Reciprocation of carriage 27 is effected by means of a screw 85 rotatably mounted along one side of the bed of the machine, said screw being engageable by a split nut 86 of' conventional construction, which is oierable by a pivotally mounted arm`87. 'llhe arrangement is such that when the arm 87 is rocked to the right, as seen in Fig. l, the nut 86 engages with the screw 85, thereby establishin an operative connection with said screw. vhen said arm is rocked to the left, said nut is expanded to disengage the screws. Coperating with said arm is a slidably mounted rod 87 adapted to be held at its right hand terminal of movement or, in a position, as seen in Fig. 1, by means of a keeper or pawl 88. Said rod is slidably mounted in a guide 89, between which and a collar 90 provided upon said rod is interposed a helical compression spring 91 adapted, upon release of said rod from keeper 88, to thrust the same to the left, in order to carry arm 87 to a position in which the split nut 86 will be moved to release screw 85. The keeper 88 is in the form of an armature with which coperates an electro-magnet 92, one side of which is grounded to the machine, the other side thereof being connected in a circuit 93 with a contact 94 provided upon the carriage. Secured to the frame of the machine adjacent the left hand.end thereof', is another contact 95 also grounded so that when thel contact 94 engages therewith, the circuit through electro-magnet 92 will be closed and said electro-magnet energized, adapting the same to attract Vthe keeper 88 and thus release the rod 87. Thus, with this arrangement, it will be seen thata when the carriage approaches its left hand terminal of movement an electrical connection will be estab*L lished, which will automatically bring the carriage to a stop, it being clear that upon movenient of keeper 88 to releasing position, rod 87 will move under the influence of spring-91 tofswing arm 87 to the left and hence to expand nut 86 from engagement with screw 85.

Rotation of' screw 85 is effected by means 96 which, in the operation of the machine, will be continuously driven from asuitable source of power. through the medium of a belt 97 and pulley 98 provided upon said shaft. Loosely mounted upon shaft 96 are also pulleys 99 and 100 which are operatively connected with the screw 85 by means of belts 101 and 102 respectively, the belt 101 'being twisted as seen to obtain reverse rotation of the screw. Operative connection between pulleys 99 and l100 is effected through the medium of clutches 103 and 104 respectively, which are splined to shaft 96.` Shifting of clutches is effected by means of a reciprocatory rod 105 which carries shifting forks 106 and 107 engaging respectively with said clutches 103 and 104. The arrangement is such, that when one clutch is moved into operative po4 sition the other clutch will be moved out and vice versa, the arrangement, further, being ,such that when clutch 104 is engaged, effecting driving of pulley 100, the screw 85 will be driven in a direction causing travel of carriage27 to the right, and when clutch 103 is engaged causing rotation of pulley 99, rotation of the screw 85 will be reversed, causing-return travel of carriage 27. The pulley on screw 85 engaged by belt 101 is smaller than that engaged by belt 102, so that return movement of the carria e will be at an increased speed. v

ctuation of rod 105 to effect the desired shifting of clutches 103 and 104is secured through the medium of electro- magnets 108 and 109 with which coperates an amature l110 fixed to said rod,'said armature being interposed between said electro-magnets, as clearly seen in Fig. 1. `One side of the electromagnet 108 is connected by means of a conducto-r wire 111 with a contact 1,12 on the frame of the machine, the other side of'said electro-magnet being connected by means of a conductor wire 113 with a contact 114 provided upon carriage 27. Similarly, one 'side of electro-magnet 109 is connected by means of a conductor wire 115 with a contact 116 on the frame of the machine, the other side of said electro-magnet being connected by means of a conducting wire 117 with a contact 118 provided upon carriage 27. The arrangement is such that -in the travel of the carriage to the right, when the carriage reaches its right hand terminal of movement, the contact v114 will engage with thecontaet 112, effecting closing of the circuit through electro-magnet 108. Said magnet will then attract armature 110 causing automatic shifting of clutch 103 into operative position, thereby causing reversal of rotation of screw 85 wlth the conse uent return movement of the carriage. hen said carriage reaches its left hand terminal of movement contact 118 will engage with contact 116, thereby closing the circuit through electro-ma et 109, with theresult of causing shi ting of clutch 104 into operative'position and with the result that rotation of screw v85 will be reversed, in order to adapt the same to drive the carriage in the opposite direction. Thus, it will be seen that the movements of the carriage will be automatically controlled.

Manual shifting 'of the carriage may be effected by the usual crank handle 119 which is connected with a pinion 120 meshing with a rack 121 provided at the underside of the bed of the machine.

In the. operation of the machine the operator brings the carriage first to its left hand terminal of movement. The string to be aeted upon is knotted at both ends, one end being engaged with hook 19, the other end being passed between rollers 36 on jaws 35, thence through the sleeve or tube 41, being finally 'engaged with the hook 22. The weight 26 produces the desired tension on the string, holding the same taut. Power is then applied to belt 13 which causes rotation of the string about its longitudinal axis,as will be readily understood. The motor 28 is then set into operation, after which the lever 56 is swung to the right to move presser shoe 51 and cause the same to press the string into engagement with the cutter. The position to which the presser shoe 51 is thus moved will be determined by arm 75 as above described. The operator then shifts the rod 87 to the right, engaging the same with keeper or pawl 88, thereby establishing connection between the carriage and the screw 85, causing travel of the carriage along the bed of the machine to the right. In this travel of the carriage the string is gradually cut or trimmed, and as the end of the string is approached, the Contact 114 engages with the r`contact 112 causing shifting of the clutch 103 into operative position, with the result of automatically reversing the carriage and carrying the same back to its initial position. lefore this reverse is effected however, the outer endof the arm 56 will .be engaged by an adjustable stop member 122 carried by bearing 12 which automatically rocks lever 56 to the left thereby retracting shoe 51, and with the result that the string will be held away from the cutting element by means of the guide members or shoes 66 and 83. When the carriage reaches its left hand terminal of movement the contact 94 will engage with the contact 95, thereby causing release of rod 87 and with the result of effecting automatic disenga ment of the carriage from screw 85. T is completes one cycle of operation, the string being then removed and another inserted in, its place to be similarly, treated. In the event of onel portion of the teeth of cutting element 34 becoming worn, the motor may be vertically adjusted through rotation of screw 32 in order to present a fresh portion of the teeth of said cutter for cutting.

While I have illustrated and describe., the preferred form of construction for carrying my invention into effect, this is capable of Variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction Set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having described my invention what l claim as new and desire to secure by Letters Patent is:

1. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting element arranged to contact with the string during rotation thereof; and means for effecting relative movement between said string and cutting element in a direction longitudinally of the string, substantially as described.

2. A string ytruing machine comprising means for rotating a string about an axis extending longitudinally 'of the string; a cutting element arranged to contact with the string during rotation thereof; vand means for effecting relative movementbetween said string and cutting element at a uniform rate of speed in a direction longitudinally of the string, substantially as described.

A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string;a cutting element arranged to contact with the string during rotation thereof; means for effecting relative movement betweei said string and cutting element inl a direction longitudinally of the string; and means arranged adjacent to said cutting element adapted to embrace and rotate the string, substantially as described.

4.'A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting element arranged to contact with the string during rotation thereof; means for effecting relative movement between said string and cutting `element in a direction longltu'dinally .of the string; and a pair of revolubly mounted jaws arranged adjacent to said cutting element adapted to embrace and rotate the string, as described.

5. A lstring truing machine `comprising means forrotating a string about an axis extending longitudinally of the string; a v cutting element arranged to contact with the string during rota'tion thereof; means for effecting relative movement between said string and cutting element in a direction longitudinally of the string; and means arranged adjacent to and in fixed relation with said cutting element for rotating the string, substantially as described.

6. A string truing machine comprising means for rotatingthe end portions of a string about an axls extending longitudi nally of the string; a cutting element ar ranged to contact with the `string during `to contact with tlie substantially v rotation thereof; and means adapted for engagement with the string intermediate the ends thereof and adjacent said cutting element for rotating the central portion of the string at a speed the same as the speed of rotation of the ends thereof, substantially as described.

7. A string truing machine comprising means for rotating.,r the end portions of a string about an axis extending longitudiu nally of the string; a cutting element movable longitudinally of the string adapted string during rotation of the latter: and means movable in unison with said cutting element adapted for engagement with the string intermediate the ends thereof and adjacent said cutting element for rotating the central portion of the string at a speed of rotation the same as that of the ends of the string. substan- 4tially as described.

8. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting element arranged to contact with the string during rotation of the latter; means for effecting relative movement of said stringand cutting element in a direction longitudinally of the string; and means for holding the string in engagement with said cutting element, substantially as described 9. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting element, arranged to contact with the string during rotation of the latter; means for effecting relative movement of said` string and cutting element inI a direction longitudinally of the string; and means adjustable toward and from said cutting element for holding the string in engagement with said cutting element, substantially as described.

l0. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting element arranged to contact with the string during rotation of the latter; means for effecting relative vmovement of said string and cutting element in a direction longitudinally of the string; means adjustable toward and from said cuttingelement forholding the string in engagement with said cutting element; and means adapted for engagement with the string being acted upon for determining the position of said holding means, substantially as described.

11. A string truing machine compri-sing means for rotating a string-about an axis extending longitudinally of the string; a cutting element arranged to contact with said string and cutting element in a direction longitudinally of the string; means adjustable toward and from said cutting element for holding the string in engagement with said cutting element; and -manually operable means adapted for engagement With the string being acted upon for determining the position of said holding means, substantially as described.

12. A Jstring truing machine comprising means for stretching a string taut and rotating the same about an axis extending longitudinally of the string; a cutting element arranged to contact with the string during rotation of the latter; and means for moving said string and cutting element relatively to each other in a direction longitudinally of the string, substantially as described.

13. A string truing machine comprising means for exerting a pull, on a string to stretch the same taut; means for rotating the string about an axis extending longitudinally of the string; a cutting element adapted for engagement with the string during rotation of the latter; and means for moving said string and cutting element relatively to each other in a direction longitudinally of the string, substantially as described.

14. A string truing machine comprising means for rotating a string about an axis extending llongitudinally of the string; a carria-ge mountedpfor movement longitudinally of the string; a cutting element carried by said carriage for lcontact with the string;

and means for moving-said carriage, sub-l stantially as described.

1 5. A string truing machine comprising means for rotating the end portions of'a string about an axis. extending longitudinally of the string; acarriage mounted for movement longitudinally of the string; a cutting element carried by said carriage for contact with the string; and means on said carriage `adjacent ysaid cutting element for Aclamping the centralj portion of the string and rotating the same at a speed the same as the speed of rotation of the ends of thestring, substantially as described.

16. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a carriage mounted for reciprocatory movement in a direction longitudinally of the string; a cutting element carried by said carriage for contact with the string; means for moving said carriage; and means for automatically reversing the direction of movement of said carriage, substantially as described.

17. A string truingl machine. comprising means for V,rotating a string about an axis extending longitudinally'of the string; a carriage mounted `for reciprocatory movement`in a' direction longitudinally of the string; a cutting element carried by said carriage for contact with the string; means for moving said carriage; means for automatically reversing the direction of movement ot said carriage when the carriage reaches one terminal of its movement; and means for automatically stopping said carriage when the same reaches its other terminal of movement, substantially as described.

18. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a carriage mounted for reciprocatory movement in a direction longitudinally of the string; a cutting element carried by said carriage for contact with the string; means for moving said carriage; means for alitomatically reversing the direction of Inovement of said carriage; means for holding the string in contact with said cutting element during movement of the carriage in one direction; and means for holding the string out of contact with said cutting element `during movement of the carriage in the opposite direction, substantially as described.

19. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a carriage mounted for reciprocatory movement in a direction longitudinally of the string; a cutting element carried by said carriage for contact with the string; means for moving said carriage; means for automatically reversing the direction of movement of sai(l carriage; means for pressing the string into contact with said cutting element during the movement of the carriage in one direction: and means 'for automatically retracting said string pressing means upon said carriage reaching one terminal of its movement, substantially as described.

20. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a carriage mounted for reciprocatory movement in a direction longitudinally of the string; a cutting element carried by said carriage for contact with the string; means for moving said carria e; means' for automatically reversing the dlrection of movement of said carriage; means for pressing the string into contact with said cutting element during the movement of the carriage in one direction; means for automatically retracting said string pressing means upon said carriage reaching one terminal of its movement; and means for holding the string out of contact with said cutting element during movement of the carriage in the o iposite direction, substantially as described.

21. A stringtruing machine comprising means for rotating a string about an axis extending longitudinallymof the string: and a rotary cutting element arranged to conlil tact with the string during rotation of the latter, substantially as described.

22. A string truing machine comprising means for 'rotating a string about an axis extending longitudinally of the string; and a rotary cuttlng element7 said cutting element having teeth upon one of the transverse faces thereof adapted to contact with the strin during rotation of the latter, substantially as described.

23. A string' truing machine comprising means for rotating a string about an axis ex tending longitudinally of the string; and a rotary cutting element, said cutting element having radial teeth upon one of the transverse faces thereof adapted to contact with the string during rotation of the latter, substantially as described.

24. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting e ement arranged to contact with the string during rotation of the latter; means for effecting relative movement between said string and cutting element in a direction longitudinally of the string; and a shiftably mounted shoe having a groove in one end adapted for engagement with the string forholding the same in contact with said cutting element, substantially as described.

25. A string truing machine comprising means for rotating a string about an axis extendinaF longitudinally of the string; a cutting 'element arran ed to Contact with the string during rotation of the latter; means for effecting relative movement of said acted upon for determining `string and cutting element in a direction longitudinally of the string; means adjustable toward and from said cutting element for holdingthe string inv engagement with said cutting element; and means adapted for yieldable engagement with the string being the position of said holding means, substantially as described.

26. A string truing machine comprising means for rotating a string about an axis extending longitudinally of the string; a cutting element arranged to contact with the string during rotation of the latter; means for effecting relative movement of said string and cutting element in a direction longitudinally of the string; means for holding the string in engagement with said cutting element; and Imeans for guiding the string to avoid contact with said cutting element except yat the place of registration therewith of said holding means, substantially as described.

27. The process of truing a string which consists in rotating the string about its longitudinal axis with the same stretched taut and applying a cutting element to the string during the rotation thereof, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

GEO. NQ EINsELE.

Witnesses:

ARTHUR A. OLSON, JOSHUA R. H. Porrs.

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