US515143A

US515143A - Tying machine

Info

Publication number: US515143A
Authority: US
Publication date: 1894-02-20
Anticipated expiration: 1911-02-20

Description

(No Model.) 4 sheets -she et 1.

L; s. BURBANK. TYING MAGHI-NE. Ne. 515,143. v I Patented Feb. 20, 1894.

W|T 115 555 4 i; J}

(No Model.) 4 Sheets-Sheet 2. L. S. BURBANK. TYING MACHINE.

Nq. 515,143. Pdtented Feb. 20, 1894.

ms NATIONAL u'momuwmus COMPANY.

wasnm emu. n. c.

(No Model.) I 4 Sheets-Sheet 3. L. S. BURBANK.

TYING MACHINE,

Patented Feb. 20, 1894.

. G 2 a I v H 4/ a wvwe .1 /u fit. g v E 2: 5 5E A. w F L h wa M dfiqiavwri u l NW x a w v 6 o y: IN 1J0 t1 cd ew 6 I 7m n 3 3c 7 L 4 4 l 0 m 1 fl// ll x \JITDIyEEEEE .8. %/7% 4 Sheets-Sheet 4'.

(No Model.)

L. S. BURBANK. TYING MAGHINE.

' No. 515,143. Patented-Feb. 20, 1894.

LOUIS S. BURBANK, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO IRVING H. FAY, OF SAME PLACE.

TYlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 515,143, dated February 20, 1894.

Application filed March 16, 1893. Serial No. 466,263. (No model.)

To all whom it may concern: the machine, which may be of any suitable Be it known that I, LOUIS S. BURBANK, of form; and A the main shaft of the machine, Boston, in the county of Suffolk and State of which is suitably journaled in portions of the Massachusetts, have invented certain new frame O near the rear of said frame. 55 and usefulImprovements in 'Tying-lliachines, 9 represents the top-plate of the frame of of which the following is a specification. the machine, which is suitably attached to This invention relates to a machine for the main portion of the frame 0.

temporarily tying together-the two sides of a E represents a plunger, which slides vertiboot or shoe upper, previous to lasting, so cally in a guide E affixed to the frame 0. 5o that, when said uppers are stitched or fas- The lower end of said plunger E is provided tened over the last, they will not gape open; with two backWardly-projecting ears E E and it has for its object to provide a machine which are adapted to engage the end of a leof simple construction and rapid operation, ver h, as shown in Figs. 3 and 4. The said which shall be adapted to introduce a string lever 72 is pivoted at h to the rear portion of 65 through two of the lace-holes in said upper, the frame 0 of the machine, and has a camand to automatically tie and sever the same roller h upon it, which is adapted to run in from a ball or length of string. a groove 2 in one side of a cam 2, the said The invention consists in the improved macam being fixed upon the shaftAand rotated chine for the above-mentioned purposes which thereby. 7o

I will now proceed to describe and claim. The plunger E is located exactly in line Of the accompanying drawings, forming with a holef in the top plateg of the machine,

part of this specification: Figure 1 represents and is adapted tobe pushed upwardly through a side view of my improved tying machine. said hole by the lever h, actuated by the cam Fig. 2 represents a top plan view of the same, 2, as above described. 25 all but a small portion of the top-plate of the B represents a block, which is adapted to frame being broken away. Fig. 3 represents slide up and down in guides B affixed to the a front elevation of the same. Fig. 4 repreframe O near the front portion thereof. The

sents a section on line 4et of Fig. 2. Figs. sliding block B is moved up and down on its 5, 6 and 7 represent different positions of the guides or ways B on the frame O, by means 83 o looper at different times in forming the knot. of a bell-crank lever F, which is pivoted to a Figs. 8, 9 and 10 represent the string at dilferboss or block F on the frame of the machine.

entstages of the knot-formingoperation. Fig. One arm of the bell-crank lever F is provided 11 represents a view of the string-guide, bewith a cam-roller, which runs in a groove in ing a section on line 11-ll of Fig. 12. Fig. a cam 5 on the shaft A; and the other arm 5 12 represents a section on line 12-12 of Fig. of said lever is engaged with the lower por- 11. Fig. 13 represents a bottom plan view of tion of the sliding block B, as shown in dot.-

a portion of the mechanism hereinafter reted lines in Fig. 3.

ferred to. Figs. 14, 15, 16 and 17 represent From the above it willbe readily seen that detail views of the looper hereinafter dethe sliding block B is moved upwardly and 4o scribed. Fig. 18 represents a perspective downwardly on its ways B once in each revoview of the second pair of pinchers. Fig. 19 lution of the shaft A.

showsalongitudinal horizontal section,illus- The sliding block B has 'journaled in it,

trating a take-up mechanism. Fig. 20 shows near its upper end, two short shafts e and e,

a detail view, taken on a section line extendthe said shafts e and 2 being in line with 5 ing longitudinally through a portion of the each other, and a space being left between machine-frame below the lever 26, as viewed their confronting ends for the passage of the in Fig. 19 and looking toward the same. Fig. tying string. The shaft e is adapted to ro- 21 shows a detail to be referred to hereinafter. tate in its bearings in the block B, but not to The same letters and numerals of'reference slide therein; and is provided with a pinion 50 indicate the same parts in all the figures. k suitably affixed to it, said pinion being In the drawings: 0 represents the frame of adapted to engage a rack is on a fixed supwith said shaft e.

port, as hereinafter described. The shaft 2' also carries on its inner end the looper a, the action of which will hereinafter be particularly explained. The shaft eis adapted both to rotate and to slide in its bearings in the block B, and has feathered onto it a pinion which is adapted to engage a rack 7c, as hereinafter described. The shaft 6 is adapted to be moved endwise by the engagement therewith of one end of a lever d, which is pivoted to a fixed support d on the frame 0. The other end of said lever is provided with a cam-roller, which runs in the groove of a cam 3 on the shaft A. From the form of the groove on the cam 3, it will be seen that, during one rotation of the shaft A, the lever 01 will cause the shaft e to move endwise first in one direction and then in the opposite direction, a period of restintervening between said movements when the said shaft 6 is in its farthest inward position, or that position shown in Figs. 1 and 2, and another period of rest occurring when said shaft e is at the other extreme of its endwise movement. The pinion k is feathered on the shaft e, so that, when said shaft moves endwise, it may slide through the said pinion and the latter will remain in engagement with the rack 70, and at the same time remain in rotative engagement The shaft 6 also carries, on its inner end, a string guide I), hereinafter described.

0 0 represent a pair of pinchers,'which are pivoted to a stud 0 The stud c has one end adapted to slide in a groove or way formed in one side of the guide-piece or standard E which supports the plunger E. The under jaw c of the pinchers is provided with a downward extension 0 which slides in a track formed in the main portions or arms 0 which support the upper jaw. One end of a spring 0 is attached to and pushes against the lower end of the extension 0 and the other end of said spring is affixed to the main portion of the pinchers-frame; the spring 0 thus tending to keep the jawsc 0' closed upon each other. The main portion of the pinchersframe has a backwardly-projecting portion t, which is adapted to be struck by a projection ton the cam 2, the said contact of the projections 25 and t throwing the pinchers forward, as will be readily seen. As the pinchers c c are thrown forward, as just described, a projection '12 on the extension 0 of the underjaw c strikes the under side of a trip 1) affixed to the standard E, thus opening the jaws. After the projection 'v has passed beyond the trips 12, the jaws are again closed by the force of the spring 0 When the lug or projection t on the cam 2 passes away from contact with the projection t on the main portion of the pinchers-frame, the latter is swung backward on its pivot c by the stress of a spring 0 attached at one end to said pinchers-frame and at the other to the frame of the machine.

8' represents a projection, attached to one end of a rock-shaft, which is journaled in a bearing in a boss or block as on the frame of the machine. On the other end of said rockshaft is an arm 8 which is adapted to rest upon the upper side of the projecting end of the stud 0 when the pinchers are in the position shown in Figs. 3 and 4.

8 represents alug or projection on the cam 2. which is adapted to strike the projection 8', thus causing the rock-shaft to make a partial revolution and causing the arm :9 upon said shaft to depress the pivot or stud o and the pinchers pivoted thereto from the position shown in said Figs. 3 and 4c, the lug s clearing the projection s when the end of said downward movement is reached. When the pinchers are again' raised, as hereinafter described, the arm .9 is raised also by the stud c and the projection s is again brought into the path of the lugs.

The racks 7c it, before mentioned, are affixed to rigid supports on the frame 0. It will be seen, therefore, that, when the sliding block B is moved upwardly or downwardly, the pinions 70 and 70 on the shafts e and 6' respectively, engaged with said racks, will cause the said shafts to rotate in one direction while the sliding block B is moving upwardly, and in the opposite direction when said block is moving downwardly.

The string-guide b on the shaft 6 is best shown in Figs. 11 and 12. From these figures it will be seen that the said string-guide is loosely mounted upon the shaft e, the guide being kept in connection with said shaft by means of a spring 72, a block or slide a and a cam n which is rigidly affixed to the shaft 6. The spring has one end attached to the string-guide, and is attached at its other end to a lug or projection a on the block or slide a sliding in ways in said string-guide, the,

said lug a being pressed against the cam 41' by the spring, and having a portion a which interlocks with a projection a of the cam, thus engaging the string-guide with the shaft e. The block or slide a is provided with a projection or finger Z), which I call the stringguide finger. Said finger is provided at its outer end with a hole a, through which the string is adapted to be threaded.

The looper a, already mentioned, is best shown in Figs. 14, 15, 16 and 17. In said figures, it will be seen that the looper consists of two parts, the main portion a being rigidly aflixed to the shaft 6', while the plate 2' is loosely journaled on said shaft, and is kept in connection with the main portion a of the looper by a spring i as shown, and a lug 2' engaging a notch i in the member a. The main portion a of the looper is provided with a shield of, as shown in Figs. 4 and 15. The plate 2' has attached to it the looper-knob 2', as shown in Figs. 4 and 14.

m represents a hook or barb, constituting one member of asecond pair of pinchers. The said hook m is attached to the outer member p of a compound sleeve G. The said compound sleeve G includes an outer member or sleeve p, and an inner member or sleeve 19, journaled on a short shaftD mounted in suitable bearings in the frame of the machine.

6 represents a lever, which is pivoted at 6' to a fixed support, and has at one end a cam,- roller, which runs in the groove of a cam L on the shaft A, and at the other end a cam-roller 19 which enters the cam-grooves 0 o in the members 19 p of the compound sleeve G.

As will be readily understood, the lever 6 imparts to the compound sleeve and to the parts connected thereto a definite movement and acorresponding return movement during each rotation of the shaft A. Beginning when the cam-roll is at the outermost end of the cam-grooves in the compound sleeve G, the

inward movement of said cam-roller along said grooves causes both sleeves toturn on their shaft D, thus rotating the devices connected with the said sleeves toward the supporting-plate When the roller reaches the end of groove 0, sleeve 19, carrying the barb m, commences to slide longitudinally upon sleeve p. Both sleeves p and 19' being connected together by means of a slot m in an extension 19 of the sleeve 10 and a screw m on an extension r of the sleeve p, they continue to rotate until the roller reaches the longitudinal portion of the slot 0, when sleeve 19 ceases its movement and sleeve 19 continues its longitudinal movement to the end of slot 0, at which point the backward movement of the lever 6 is commenced, the cam 4 being timed in accordance with the grooves 0 0, as will be readily understood.

m constitutes the second member of the second pair of pinchers, and is pivoted at r to an arm or support m which is part of the inner sleeve 19 of the compound sleeve G. From the movement of said compound sleeve above described, it will be seen that the two members m and m of the second pair of pinchers are rotated down together, and that the member m, affixed to the outer sleeve 19, is then projected through and beyond the member m. The sleeve 19' is provided with a cam-projection r on its side which is next the member m, and the latter hasa set-screw 7* at its outer end. It will be seen that, when the member m is projected in advance of the member m and again when said member an is retracted to its normal position shown in Fig. 2, the set-screwr will pass over the camprojection 'r and will cause the front orinner end of the member m to close upon the member m.

The barb m slides in a track made for itin the arm or support to which the member m is pivotally connected. To the member m is affixed, just in front of its pivot point, a spring 5, as shown in Fig. 18. The barb or hook at is made with a scissors edge at M and the member m has acorresponding scissors edge at m so that, when said members are closed upon each other by the action of the cam-projection r upon the set-screw r, as

before described, they will sever the string. The spring a, being slightly in advance of the member m to which it is attached, will come down upon the string and hold it firmly against the upper side of the arm or support m It will be seen that the string is firmly held by said spring 2 and arm m for a short period before the severing action of the members m and m, during said action, and fora short period after the same. Itis during this last period that the pinchers c and c, holding the other end of the string, move downwardly, thus drawing the knot taut. The loose end of the string, projecting from the string-guide b, is not held by the pinchers m m, the spring 2 being on one side of the said scissors-blades, namely, the side nearest the front of the machine, said spring only holding the end of the string connected with the knot. After being severed, the loose end projecting from the guide I) is withdrawn by the before-described movement of said string-guide, before the knot is drawn taut by downward movement of the pinchers c c, as before described.

The operation of the machine is as follows: The sliding block 13 being in its lowest position, the end of a ball of string is threaded through the hole a in the finger b of the string-guide (see Fig. 12). The machine is then threaded and ready to start. The shaft A being rotated, the lug or projection 25 strikes the cam-projection t of the pinchers c 0, moving said pinchers forward, the pinch ers being opened at the same time by engagement of projections 11 and o. The stringgnide b is at this time in line with said pinchers, and, just before the latter reach the end of their forward movement, the end of the string, projecting through the hole a, comes between the jaws of said pinchers, and the string is therefore grasped by said jaws when they close at the end of their forward movement. The cam-proj ection 2? passes away from the projection t and allows the pinchers to be drawn backwardly by the spring 0 drawing with them a supply of the string through the slot (1 of the finger b. The piece of string thus grasped by the pinchers, extending from them through the string-guide finger b, is in a line directly over the line of travel of the plunger E. The cam 2 then operates the lever h, causing the plunger to ascend through the holef in the plate g. The top of the plunger is grooved, and comes in contact with. the string in itsupward movement, carrying said string with it upward th rough the hole f. The plunger is then in the position shown in the drawings. described, all cams rest long enough to enable the operator to place a boot upper over said plunger, allowing the plunger to project through two of the lace-holes in said upper, the edges of the upper being toward the front, as shown in Figs. 5, 6 and 7, in which a u is the upper. In this upward movement of the string and plunger, to save the string from running over the endof the plunger, the

When the plunger has come up, as- 25 the knob t.

pinchers c o holding one end of the string are permitted to rise to the position shown in the drawings, by the action of the plunger, the path of travel of said pinchers being indicated by the dotted line to in Fig. 4. The plunger pulls sufficient string through the hole a in the string-guide to permit its described movement. The shaft e is then moved still farther inward by the lever d, carrying the stringguide finger beyond the path of the looperknob t'. The bell-crank lever F, actuated by the cam 5, then begins to move the sliding block B upwardly, and the fixed racks 76 is, engaging the pinions k cause the shafts e e, j ournaled in said block, to revolve. lhe revolution of the shaft 6' causes looper a and the looper-knob 'i to travel in the path shown by the dotted line q in Fig. 3. The first direction of the looper and looper-knob is downward, crossing the string, the shield a on the looper a, striking the string and throwing it over so that the looper knob hooks over said string, and its further revolution carries the string with it. The string-guide b is then moved outwardly, or toward the left, by means of the lever d, acting on the shaft e to which said guide is attached, the shaft at the same time rotating and carrying the string-guide with it. It will thus be seen that the string may pass between the looper and guide, as shown in Fig.6, and also through the space between the confronting ends of the shafts e e. As the looper thus revolves, it forms a loop on The shafts e and e continue to revolve as the block B rises, until the looper-knob t' strikes the top of the plunger E, and the side Z of the string-guide I) (see Fig. 11) strikes the upper which is engaged with said plunger. When the looper-knob 2' strikes the top of the plunger, it stops and the looper a continues to revolve, carrying the loop formed on the knob 2' down over the plunger. When the side Z of the string-guide strikes the upper, the guide stops, and the shaft 6 still continues to revolve, the cam 'n' on said shaft moving the block a carrying the stringguide finger away from it, thus carrying the string beyond the plunger (see Fig. 7). It will be seen that the block B, sliding in its diagonal or sloping track, carries the looper and looper-knob and the string-guide up to the plunger E, so that, when the loop is formed by the revolution of the knob, said knob swings over the plunger and strikes the upper end of the same, dropping the loop over said plunger and the bight of string supported .thereby, the looper a carrying the said loop downwardly after the looper-knob has struck the plunger, as described. The cam 4 then moves the lever 6 to operate the compound sleeve G, and the said devices, operating as already described, project the hook m, the said hook passing between the plunger and string, as shown in Fig. 7, and then retract said hook, carrying with it the string carried across its path by the before-described movement of the string-guide b, the other member m of the second pair of pinchers closing upon the hook m and severing the string and holding the end between the members m and 2, as described. At the same time as the second pair of pinchers m and z, holding one end of the string, are retracted, the first pair of pinchers c c, holding the other end of the string, are caused to move downwardly by the engagement of the projection s on the cam 2 with the projection s, as already described. At the same time, the plunger E, actuated by the lever h, is retracted, the cam 2 being timed accordingly. It will thus be seen that the knot formed on the string is drawn taut. The pinchers c c, holding the string between them by spring-pressure, will let said string slip when the knot has reachedits proper tension. As soon as the string is cut, as above described, the block B begins to move downwardly, carrying the loose end of the string with it. The hole a in the string-guide finger b is provided at one end with a tension-b which prevents the loose end of the string from slipping back through it. As the block B begins to slide downwardly, the shafts e and e rotate in the opposite direction from that in which they rotated during the upward movement of said block. As this backward rotation commences, the main portion a of the looper rejoins the plate '5 carrying the knob t', the two being brought together again by means of the spring The string-guide I) also resumes its normal position on the shaft e soon after the commencement of the said backward rotation, the spring n acting on the cam n to bring about the desired result, as will be readily seen.

The plunger E is preferably made, as shown in Figs. 3 and 4., with a slight overhang at its forward side, so as to adapt it to hold the string a little in front of its side and allow room for the entrance of the hook mbetween the said string and plunger.

The main driving shaft A of the machine may be driven by any suitable means, as by a crank, or belt and pulley, or in any other suitable way.

20 represents an adjustable tongue, over which the loop is tied when it is desirable to have more play in it, when the uppers are uni)olded and placed upon the last (see Fig. 21.

Referring to Figs. 19 and 20, 21 designates a hole in the base of the machine, through which the string 25 is supplied. 22 is a block, between which and the spring 23 the string 25 is held fast when the spring 23 is released by the lip 24 of the bell-cranklever 26, which is actuated by the superior spring 27 and the side cam-projections on cam 5.

During the revolution of the looper '5 more string is drawn from the supply than is needed in the knot, and, as the knot is being tied, the first rise 28 of the cam 5 actuates the lever 26, throwing the end bearing the stringeyelet 29 back, releasing the spring 23, which immediately holds the string 25 fast between itself and the block 22 and takes up the slack from the loop. When the knot is tied and the string cut, the end left projecting from the finger b is. unnecessarily long and the second projection 30 on the cam throws the lever 26 into its return position, drawing the string back through the finger 1) until it proects suitably. The lever then returns to its grigiinal position, leaving the string free to Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A machine of the character described, comprising in its construction a plunger adapted to take the stringthrough the article under treatment, a movable string-carrier or looper having normal position on thatside of the article which the plunger enters, means for moving said carrier to the other side of the article, and means for forming a knot of the bight held by the plunger and that brought to it by the carrier.

, 2. A machine of the character described, comprising in its construction a plunger adapted to take the string through the article under treatment,'a string-holder or guide, a movable grasping device adapted to take an end of the string projecting from the holder or guide and draw it across the path of the plunger, a movable string-carrier or looper having normal position on that side of the article which the plunger enters, means for moving said carrier to the other side of the article, and means for forming a knot of the bight held by the plunger and that brought to it by the carrier.

3. A machine of the character described, comprising in its construction a verticallymovable plunger adapted to engage thestring, a vertically-movable graspingdevice arranged to take the string and draw it across the path of the plunger and to be elevated with the plunger by means of the string, a looper arranged to carry the string from one side of the article under treatment to the other, and means for forming a knot, substantially as described.

4. A machine of the character described, comprising in its construction a verticallymovable plunger adapted to engage the string, spring-closed grasping-jaws to take the string and draw it across the path of the plunger, means for automatically opening said jaws, a looper to take the string from one side of the article under treatment to the other, and means for forming a knot in the string, substantially as described.

5. A machine of the character described, comprising in its construction a verticallymovable plunger, a pivoted grasping-device arranged to draw the string across the path of the plunger, a cam for actuating said grasping-device in one direction, a spring to actuate it in the opposite direction, a looper to carry the spring from one side of the article under treatment to the other, and means for string, substantially as described.

forming a knot in the string, substantially as described.

6. A machine of the character described, comprising in its construction a carrier to take the tying string through the article un- 'der treatment, a vertically-movable graspingdevice for holding one end of the string, a looper to carry the string from one side of the article to the other, means for forming a knot in the string, a second grasping-device, and means for depressing the first grasping-device after the knot is formed.

'7. A machine of the character described, comprising in its construction a plunger adapted to take the string through the article under treatment, a rotary string-carrier or looper having normal position on that side of the article which the plunger enters, means for moving said carrier to the other side of the article and rotating it during such movement, and means for forming a knot of the bight held by the plunger and that brought to it by the carrier. j

8. A machine of the character described, comprising in its construction a plunger ar ranged to carry the string through the article under treatment, a rotary string-guide, a rotary looper co-acting with said string-guide and arranged to carry the string from one side of the article to the other, and means for forming a knot in the string, substantially as described.

9. A machine of the character described, comprising in its construction a pair of shafts arranged end to end with a space between their confronting ends, a string-guide carried by one of said shafts, a looper carried by the other shaft, a plunger to take the string through the article under treatment, means for moving the two shafts and rotating the string-guide and looper whereby the string is carried from one side to the other of thearticle under treatment and a loop formed, and means for forming a knot in the string, substantially as described. 10. A machine of the'character described, comprising in its construction a plunger arranged to carry the string through the article under treatment, a rotary and longitudinallymovable string-guide, a rotarylooper co acting with said string-guide and adapted to carry the string from one side of the article to the other, and means for forming a knot in the 11. A machine of the character described, comprising in its construction a plunger arranged to carry the string through the article under treatment, a rotary and longitudinallymovable string-guide,arotarylooperco-acting with said string-guide and arranged to form a loop and carry the same over upon the bight of string held by the plunger, and means for forming a knot in the string,substantially as described.

12. A machine of the character described, comprising in its construction a plunger arranged to carry the string through the article A under treatment, a string-guide having a sliding finger which holds the string, a rotary looper co-acting with said guide to form a loop and carry the same over upon the bight of string held by the plunger, and means for forming a knot in the string, substantially as described.

13. A machine of the'character described, comprising in its construction a plunger arranged to carry the string through the article under treatment, a rotary looper composed of two members yieldingly held together, one of them having a looper knob arranged to come upon the plunger and the other arranged to push the loop off-the said knob and over the plunger, and means for forming a knot in the string, substantially as described.

14. In a machine of the character described, the combination of a string-guide adapted to carry a string, a grasping-device for pulling saidstring therefrom, a plunger adapted to carryalength of said string through the laceholes in the upper of a boot or shoe, a topplate or work-support adapted to support an upper in position, a rotary looper adapted to co-operate with the said string-guide in forming a loop and in passing said loop over the bight of the string supported by the plunger, and a hook adapted to pass through said bight and draw the string therethrough, thus forming alf knot and fastening together the two sides of the upper, as set forth.

15. In a machine of the character described, the combination of a string-guide, adapted to carry a string; a pair of pinchers, adapted to be projected and opened, and then closed and retracted to grasp said string and pull a portion from said string-guide; a plunger, adapted to move vertically and to engage the string; atop-plate or work-support adapted to support the upper of a boot or shoe; a rotary looper, adapted to co-operate with the said string-guide in forming a loop in said string, andtopass said loop over the bight of the string supported by the plunger; a hook, adapted to pass through said bight and draw the string therethrough, thus forming a knot and fastening together the two edges of the upper; and a cutter, adapted to out said string so drawn through the bight by the said hook,

as set forth.

16. In a machine of the character described, the combination of a rotary string-guide mounted on a shaft and adapted to carry a string, a rotary looper mounted on a shaft, pinions on said shafts, a sliding block in which said shafts are journaled, fixed racks engaging the pinions, pinchers adapted to be projected and opened and then closed and retracted to grasp and pull out a portion of said string, a plunger moving vertically and having its upper end adapted to engage said string, a top-plate or work-support for the upper of a boot or shoe, a hook adapted to be projected through the bight of string on the plunger and to draw the string through said bight, and a grasping and cutting device adapted to grasp the end of the string thus drawn through the bight and to sever the same, retaining the severed end of the string until the knot is drawn taut, as set forth.

17. In a machine of the character described, the combination of a string-guide, a pair of pinchers adapted to pull a string out of said guide, a plunger adapted to carry a bight of the string upwardly through an orifice in a work-support, a looper adapted to make a loop in said string, a sliding block, as B, sliding in a diagonal track in the front of the machine, said block carrying the said stringguide and looper and being adapted by its diagonal track to carry said parts over the said plunger during their operative movement and back from said plunger during their receding movemenhas set forth.

18. In a machine of the character described, the combination of a string-guide, a pair of pinchers adapted to grasp and pull out a length of string, a plunger adapted to carry a bight of string upwardly through a hole in the top-plate or work-support, a rotary looper composed of two parts having a spring connection between them, one of said parts being adapted to form a loop in the string and the other to force said loop down over the bight of the string supported by the plunger,

a shaft on which said looper is mounted, and

a sliding block in which the said shaft is journaled, as set forth.

' 19. A machine of the character described, comprising in its construction a plunger arranged to carry the string through the article under treatment, a rotary string-guide, a rotary looper oo-acting therewith and adapted to form a loop and deposit itover the bight of string on the plunger, a longitudinallymovable hook arranged to draw the string through the bight on the plunger, and a grasping-device co-acting with said hook, substantially as described.

20. In a tying machine,a take-up mechanism, comprising aspring arranged to hold the string, a lever engaging said spring, a superior spring acting against the lever, and a camwheel adapted to move said lever against the said superior spring.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 11th day of March, A. D. 1893.

LOUIS S. BURBANK.

Witnesses:

A. D. HARRISON, WALTER S. MoLEoD.