US967019A - Yarn-splicing device for knitting-machines. - Google Patents

Description

APPLICATION FILED JAN. 21, 1910.

Patented Aug. 9, 1910.

6 BHEETS-SHIIET 1.

INVENTOR (a, BY 4 WITNESSES $13MW APPLICATION FILED JAN. 21. 1910.

Patented Aug. 9, 1910.

6 SHEETS-SIIEBT 2.

v {NVENTORI WITNESSES:

A TTORNE Y7;

H. A. HOUSBMAN. YARN SPLIGING DEVICE FOR KNITTING MACHINES. APPLIOATION FILED JAN.21,1910.

Patented Aug. 9, 1910.

GEHBETS-SHIBETG. Q Ma;

WITNESSES: I

J, INVENTOR R BY M W M mam",

u dg RNEyfi A. HOUSEMAN. YARN SPLIGING DEVIGBFOR KNITTING MACHINES.

APPLICATION FILED JAN. 21, 1910.

Patented Aug". '9, 1910.

6 MEETS-411E111 4.

WITNESSES H. A. HOUSEMAN. YARN SPLIGING DEVICE FOR KNITTING MAGHINE$.

APPLICATION FILED JAN. 21, 1910.

Patented Au 9,1910.

6 w TEE-SHEET 5.

' amolermm H. A. HOUSEMAN. YARN SPLIOING DEVICE FOR KNITTING MACHINES.

APPLIUATION FILED JAN. 21, 1910.

' Patefited Au 9,1910.

e MEETS-sum 6.

III II "II .II II III! l l ll II If?! INVEN TOR the roller 1' rests.

the walls of which at the ends have the projections h. v

30 is a rock-shaft and j a sliding plate.

0 is a clamp formed of the two members I: and Z connected by spring m. .The member Z is mounted on a plate 7'0 on shaft 0. The part L is pivotally conected at is to the plate n. Projecting from the tail piece q of clamp member 7a is the roller 1. The plate 91, rests on a sleeve 5. The uppersurface of the sleeve 8 has the cam surface t upon which When the sleeve 8 is ele- Vatd both clamping members is and Z are elevated. hen the shaft 0 is rotated the clamp as a whole is rotated, and,in one direction, the cam 15, acting on roller 1, opens the movable jaw against the action of spring m and, in the other direction, the cam allows the sprin m to close the jaws.

From tie rock shaft projects the finger u resting between the flanges o and Q1 of sleeve 8 and when the shaft is rocked in one direction the sleeve is elevated and with it the clamp, and, when the shaft is returned, the sleeve and clamp-are returned to their initial position.

The sliding plate j has the forked projection in between which a pin :0, projecting from a lever y mounted on shaft 0 rests. "When this sliding plate j is moved in one direction the lever y is moved, rotating the shaft and with it the clamp, the cam surface of the sleeve allowing the spring to close the clamp, and in the other direction reverses the rotation of the shaft and the clamp, the cam surface causing the clanip to open against the action of the spring.

40 is the shaft for shifting the clutch to change the movement of the cam cylinder 41 from rotation to reciprocation and vice versa, as described and illustrated in Letters Patent issued to me April 30, 1895, No. 538,518. Upon this shaft are the cams a and 25. a is the cam for operating gear 6, and b is the cam for operating the sliding plate j.

The connections for operating gear 6 are as follows: The follower 1 for cam-a has a rod 10 which is connected to the frame of a segmental gear 2 pivoted at 36. This segmental gear forms a lever of the third class. The segmental gear meshes with a gear 37 on shaft 3, on which shaft is the gear f. The tail piece 4 of the segmental gear 2 carries a cam 5, which in the upper portion of the throw of the segmental gear strikes a pin '38 on the arm 100 fast on rock shaft 30. This lever 100 is provided with a spring 7, one end connected to lever. 100 andv the other pin 38 in line with cam 5.

A. sprii'ig 8, one end connected with the frame of machine and the other end conrod 10 down against action of cam (r and returns it, and segmental gear when the cam 11. allows rod 10 to drop after being elevated. The threads pass through the tension device 12 acted on by spring 13. A pivot/ed. finger 14:. is adapted to rest under this tension de' vice and relieve the action of its spring. This finger is ,controlledby the pivoted trip 15, the tail piece of which is operated by a. pin 17 on the frame of segmental gear, which pin 17 is in such position that when theseglnental gear is in its upper position the trip holds the finger 14' to maintain the tension device out of operation, (see Fig. 16) and when the segmental gear is in its lower i osition, a second pin 1'? releases the trip, a lowing the tension device to go into action.(see Fig. 17).

The connections from cam b for operating the sliding plate 7' are as follows: The rod 18 from earn 1) has a spring normally holding it in its downward position and returning it to that position when cam allows the rod 18 to fall from'its elevated position. The rod 18 is connected by a bell crank lever 19 and connecting rod 208 to sliding plate 7' so that in the movement of the rod 18 in one direction the plate 7' is moved forward and in its movement in the other direction returnsthe slide. On the end of the slide j is the incline 20.

21 and 22 are the cutter jaws. The 'aw 21 is pivoted at 23 and jaw-22 is pivoted at 24 on stand 250 in front of the winder 300. On the face of the cutter jaw is the groove 260 in which rests the pin 270 connected to cutter jaw 21. An arm 280 is pivoted to jaw 21. This arm, at its, lower end, is beveled and rests on slide A spring 290, having one end connected to tail piece ofjaw 21 and the other end to stand 250, normally holds the two jaws together.

-VVhcn. the slide moves so that the arm 2S0 cular work (cam cylinder-rotating) the pawl is prevented from operating tooth 52 as the crown of the tooth is longer than the throw of the pawl. The ratchet is shifted j to make this tooth operative in the manner end to the frame of the machine. The pu'rdescribed in my said patent. The pawl then operates teeth 52 and 53 and the shift to reciprocation is made, and after such shift, operates on tooth 54. It is prevented from operating on the next tooth 55 by shield a which when released causes pawl to operate nested to boss 9 on red 10, normally holds 1 teeth and 56. The rcshift of the clutch purpose I use the following device.

acacia i i shifting shaft to return the movement of the cam cylinder to rotation takes place with tooth 56.

The cams o and b are formed as shown so that with the operation of tooth 52%,through the mechanism described, the clamp holding the supplemental thread in line with open forward end of theslots rotates, carrying the thread into and along the groove in the tube at the same time the seguiental gear allowed to drop sligl'itly, to carry the supplemental thread rearward in the slot. (hi the action of tootl'i 53 the segn'icntal gear allowed to drop :t'reely and the supplemelil tal thread is firmly wound on, the main thread by the rotation of the tube, and is drawn into the necdh-s by the main thread without any tension resistance, and finally the clamp mores downward. at substantially the end of the drop of the segmental gear the tension trip is released and the tension device i goes into action, the supplemental thread at that time being tally entered into the needles. The action of tooth 54- rotates the clamp forward, opens the cutters, and separates or opens the clamp iIlII1b'Bl'.S., The action of tooth 55 partially raises the segmental gear, raising one member 1 0-IlECllIl1P- ing members/ c and l of clamp 0 between the supplemental and inain threads and rotates clamp outward, drawing the supplemental thread into line with the open end of the spiral slot and toward the cutters. The action of tooth 56 brings segmental gear to its upper position, bringing trip into action to hold tension device out ot' action, and further rotating the clamp to bring the thread in cutting relation with cutters, closing the cutters on the supplemental thread and clamping the tree end of that thread be-.

tween the clampingmembers l: and Z or clamp (a his completes a cycle of opera tions of cams on and 5, through the mechanism described, upon the clamp, cutters and seinnental gear and its connected Winder and the tension device, in one rotation of the shifting shaft produced by the action of the pawl 51 upon the teeth :33, 54;. 55 and 56 ot' the ratchet 50. The use eta segmen tal gear in the form of a lever'of the third -class, enables it to drop quickly and avoids any complicated mechanism and makes the rotation of the tube to wind rapidly.

then the sum ilcineutal thread has been removed out of action, cu i and held by the clamp, the suppleiinental thread, coming from the cop should be locked Forthis The Sll{)1')l(li'l(lli,ll thread passes between the jaws 200 and E201, pivoted together, the tail piece 202 't'rmn one of the jaws, is provided with a spring eonuectioi'i 203 which normally holds the jaws closed. The jaws are opened at the proj'ier time by the following mechanism: The tail piece has a cut away portion, as shown, which when the jaws are closed, rests in the. low point of a ivoted cam lever 20 i, acted upon by the spring 201, which spring tends to pull the cam lever in a direction to elevate the tail piece and re lease the jaws. The tail piece 206 not this cam lever rests against a springacted' trip 20?, which holds the cam lever a ainst the action of its spring. The stan 209 on which this spring acted trip 20? is mediated, is connected to the connecting rod 208, which connecting rod, through mechanism hercinbetore described, operates the sliding The position oi this connecting rod during the period in which the supple mental thread not being used for ltnitting, is in a rearward position, and in such position that the trip holds the cam lever out of action, as shown in Fig; This, the only position in which the supplemental thread is entirely inactive. in all other positions or conditions it is either being twisted or drawn into the needles, or sepa rated from the main thread and withdrawn. from the needles and cut The initial move merit of the sliding plate as hetero described, is a rearward one to move the clamps longitndinz-illy rearWu-rdly or"? the groove in the winder, in this rearward movement the trip beyond the tail piece of the cam lever) and the cam lever acts through its spring to open the arts, @n'the forward movement of the sliding rod, the trip 20"? being pivoted at 210, and acted on by the spring 5211, will turn on its pivot point without aflec ing the cam lever. On its return rearward movement, the plate will stop at a point which will hold the trip at a point shown in Fig. 12, when it will have pushed the cam lever into such posi-' tion as to cause the tail piece acted on by its spring to close the aws, 200 and 201,

i and will maintain it locked in that position until the preceding described operation is again resumed.

Having now fully described. my inven tion, what I claim and desire to protect by Letters Patent is: 1. in a knitting machine. the combination of a rotary winder, comprising a tube having an open ended spiral groove, through which tube a plurality of threads a clamp for holding one of said threa s in line with the mouth of said groove, means to simultaneously rotate said winderand move said clamp longitudinally ot the Winder to carry said thread along said groove. i 2. lo a knitting machine, a thread separator said spreader, eoinprisii'ig a clamp having clan'ipii'ig members, one clamping member of which forms a s tireader to separate the running and introduced threads and draw the introdtmed thread away from the running thread, and means to cause said 130 clamping, member to close on said thread when drawn away from the running thread. 3. In a knitting machine, the combination .with a thread separator and spreader, comprising a clamp having clamping members, one clamping, member of which forms a spreader to separate the running and introduced threads and draw' the introduced thread away from the running thread, of means to cause said chimping member to close on said introduced thread when drawn away from the running thread, cutting mechanismin line with said introduced thiread when drawn away from the running thread, and means to operate said cutting mechanism. i

4. .ln a knitting machine, in COlTtlJlfltlilOn, a rota ry winder having an open ended spiral groove, hreads passing through said winder, a clamp between the members of which one of said threads is adaptedto be held in line with the mouth of said groove, means to successively give the clamp the following movements, a movement longitudinally of the winder, downward and longitudinally in a reverse direction, opening the members, then laterally and vertically to' bring one member between the threads, then laterally in a reverse direction to separate the threads to draw one thread away from the other, and finally closing the clamp on the thread.

In a knitting machine, in combination, a rotary winder having an open ended spiral groove, threads passing through said winder, a clamp between the memlwrs of which one of said threads is adapted to be held .in line with the. mouth of said groove, means to successively give the clamp the following movements, a movement. longitudi' nally of the winder, downward and longitudinally in reverse direction, openine the members, then laterally and vertically to bring one member between the threads, then laterally in a reverse direction todraw one thread away from the other, cutting mechanism into which the thread is drawn in the last movement, means to close the clamping members on the thread, and means to operate the cutting mechanism in the last men tioned movement.

6. In a knitting machine, a rotary tubular winder through which a plurality of threads pass, said winder having an open ended spiral groove, means to enter the introduced 'threadinto the mouth of the groove, and

means to rotate said winder.

7. In a knitting machine, a winder through which a plurality of threads pass, said winder having an open ended spiral groove, means to rotate the winder, means to carry the introduced thread to the month of the spiral groove, and means to positively move the introduced thread in the ,groove longitudinally of the winder.

8. In a knitting machine, in combination,

a rotatable winder, a clamp adjacent: to the winder, said clamp having members, a rotatable shaft upon which said clamp is mounted,

a plate having a cam surface, there being a projection from one clamp member resting on said cam surface, and'means to rotate said shaft.

9. In a knitting machine, in combination, a rotatable winder, a clamp adjacent to the winder, said clamp having members, a rotatable shaft upon which said clamp is mounted, a plate having a cam surface, there bcing; a projection from one clamp member resting on said cam surface, means to rotate said shaft, and a spring connection between said clamping members.

10. In a knitting machine, in combination, a rotatable winder through which the threads pass, a claim p having clamping members, the said clamp being adjacent to the winder, a movable sleeve said threads being guided in alinement with said movable sleeve, said movable sleeve being adapted to move said clamp to cause one clamping mernher to enter between the threads, and means to move said sleeve.

11. In a knitting machine, in combination, a rotatable winder through which the threads pass, a clamp having clamping incinhers, the said clamp being adjacent to the winder, a rotatable shaft upon which said clamp is mounted, a plate having a cam surface, there being a projection from one clamp member resting on said cam surface, a movable sleeve said threads being-guided in alinement with said movable sleeve, said movable sleeve being adapted to move said clamp to cause one member to enter between said threads, means to rotate said shaft, and means to move said sleeve.

12. In a. knitting machine, in combination, a rotatable winder through which the threads pass, a clamp adjacent to the winder, said clamp having clamping members, a

rotatable shaft upon which said clamp is mounted, a plate having a cam surface, there being a prenection from one clamp member resting on said cam surface, a sliding late,

and connection betwecn'said plate and said shaft whereby, in the moizen'ient of the plate in one direction, the shaft is rotated in one direction, and vice versa ,in the opposite direction of movement of the plate, and means to move said plate in opposite directions.

13. In a knitting machine, in combina tion, a rotatable winder through which the threads pass, a clamp adjacent to the winder, said clamp having clamping members, a rotatable shaft upon which said clamp is mountecLa plate having a cam surface, there being a projection from one clamp member resting on said cam surface, a sliding date, and connection between said plate, and said shaft. whereby, in the movement of the, plate or note in one direction, the shaft is rotated in doe direction and vice verea in the opposite (ii-- reotion of inoven'ient of the plate, a clutch shifting shaft, :1 coin upon said shaft, and

connection between. said cam said plate.

14 The combination, doinprisingr a 'WlHlTlGI' for the end: of the i11-.;rodnced thread, a inovalole clamp, saidjclainn lacing adacent to the Winder and. havingclamping members one clamping member of wt 'c 'ter between the introduced thread and the running thread, and means to operate said clamp so as to separate the said threads and hold tha supplemental. thread in preparation for a further operation.

15. The combination, comprising a Winder for the endtof the introduced thread, a mov ahle clamp, one member of which is adapted to enter between the introduced thread and therunning thread, means to operate said clamp so as to separate the said threads. and hold the supplemental thread. in prepari tion for a further operation and means to move the clamp longi itndinally of the Winder duringthe initial iotatation of the Winder.

1 6. lln a lrnittingr machine, in comhination, a rotatable winder, clamp adjacent thereto and having clain iiing men'ihcie, a retatable shaft upon which said clamp is mounted, a plate having a corn surface, there being a projection from one clamping inem her resting on said cam surface, a vertically movable sleeve adapted. to elevate said clamp, means to more said. plate, a tool: shaft for operating said. verticallv n'iovahle sleeve, a clutch shifting shaft, came upon said shaft, connection between one cam and the plate, connection lietiveen the other cam and the rock shaft.

W. in a knitting machine, in cornhi iation, a rotatable Winder, a clnnp adjacent thereto and" having clamping}; members, rdtatahle shaft upon which said clamp is inoilnted, a plate having a earn snrface,.there hcing projection from one clamping'memhcr reatint on. said cam surface, means to rotate said shaft, cutting mechanism, and means to open said cutting mechanism in the on oration of the means to rotate the shaft in one direction and close said cutting; mechanism in the operation of the means to re tate the aha. in theotl'ler direction.

18. lln a knitting machine, in coinhination, a rotatable winder, a clamp adjacent tl'ioretc and having clamping ineml'iers, a rotatable shaft upon which said clamp is mounted, a plate haviong a earn surface,-therc being a rojection from. one clamping member rest mg on said cam surface, means to rotate said shaft, cutting mechanism, and means to render said cutting" mechanism receptive and means to operate said cutting means.

19. in a knitting machine, in combination, a rotatable winder, a clamp adjacent thereto and having clamping; members, a in,

h is adapted to on;

tatahle shaft upon Which said clamp mounted, a plate having a cam surface, there being a projection. from one clamping mom her resting; on. said oanisurface, a sliding plate, connection hetvveen said plate and said. shaft Whereh v, in the movement of the plate in one direction the shaft rotated. in one direction and. vice versa in the opposite di rection of moveinrnt of the plate, means to move said plate in. oppositedirectione, cutting; mechanism, and connection between said cutting niechanlsm and said plate,

adapted in the movement of the plate in one direction to render said cutting mcchanisni receptive, and in. the other direction to operate said cutting mechanism.

20. in a knitting machine, in combination, a rotatable Winder, a clamp ad acent thereto and having clamping members, a rotatable ell-raft upon which said clamp is mounted, a plate having. cam surface, there being; a projection from one clamping member rest ing on said earn surface, a sliding plate, connection between plate and said shaft- Wherehy, in the movement of the plate in one direction the shaft is rotated in one direction and vice versa iiithe opposite direction of movement of the plate, cuttinginechanisni, conneeti on loot-Ween said cutting mechanism and said plate, adapted inthc' movement of the plate in one direction to render said cutting? mechanism receptive, and inthi other direction to oierate said cutting;mechanism, a clutch shifting shaft, a cam upon said shaft, and connection hetvveen StLlCl earn. and said plate for operating said plate. E1. in a knitting machine, in coinhii'lation, a rotatalole Winder, a clamp adjacent thereto and having clamping members, a rotatable shaft upon which said clamp is mounted, a plate having a cam surface, there being a projection from one clampingnicmher resting on said cam surface, a sliding plate, and connection loot-Ween said plate and said shaft Wlierehy, in the moveincnt of the plate in one direction, the shaft is rotated in one di rection and vice versa in. the opposite direction of: movement of the plate, a rotatable shaft, a cam upon said shaft, and connection between said earn and said plate.

22. in admitting machine, in combination, arIJotatahle hinder through which a plural ity of threads pass, a clamp adacent thereto and having claniping n'lemhers, a movable sleeve adapted to move said clamp, means to move said sleeve, a rock. shaft for operating said movable sleeve, a rotatable shaft, a cam upon. said shaft, and connection hetwcon said can-1 and said shaft for rocking said shaft, the threads passing through the winder heing guided in alinoment with said sleeve,

23. lo. a ltnitting machine, in combination, a rotatable winder through 'whicli' a plurallee.

ity of threzfds pass, a clamp adjacent thereto and having clamping members, a rotatable shaft upon which said clamp is mounted, a plate having a cam surface, there being 55 a projection from one clamping member resting on said cam surface, a movable sleeve adapted to move said clamp, means to move said plate, a rock shaft for operating said movable sleeve, a rotatable shaft, cams upon said shaft, connection between one camand the plate, connection between the other cam and the rock shaft, said threads passing through the winder being guided in alinement with said sleeve.

24. In a knitting machine, a rotatable winder through ity of threads pass, said clamp having clamping members, a rotatable shaft upon which said clamp1 is mounted, a plate having a cam surface,t ere being a roje'ction from one clamping member resting on said cam surface, a slidin plate, connection between said plate and S\l( shaft- Whereby, in the movement of the plate in one direction the shaft is rotated in one directiornand vice versa in the opposite direction of movement of the plate, cutting mechanism, connection between said cutting mechanism and said plate, adapted in the 39 movement of the plate in one render said cutting mechanism receptive, and in the other direction to operate said cutting mechanism, a rotatableoshaft, a cam upon said shaft, and connection between said cam and said plate for operating said plate.

25, In a knitting machine, in combination, a rotatable winder, through which the supplemental and main thread pass, a gear for operating 40 said gear, a tension device for the threads, a trip for holding said-tension device out of action, and means adapted at the completion otthe movement of the gear in one to release said trip, and means 15 in combination,

which a plurala clamp adjacent thereto,

direction adapted at the completion of the movement of the gear in the opposite direction to throw said trip' into action.

. v 26. In aknitting machine, in combination,

' arotatable winder, through which the sup- 0 plemcntal and main threads pass, a gear for operating said winder, means to oscillate said gear, a. tension device for the threads.

a trip for holding said tension device out of action, a device carried by said gear which acts against said trip to throw it out oi action at the completion of its movement in one direction and to throw said-trip into action at the completion of its movement in the opposite direction.

27. The combination with the pivoted jaws and the spring for closing said jaws, of the cam lever and its spring for normally holding said clamp open, a trip cooperating with said cam levenin the movement in one direction of the trip, and adapted to release direction to.

said winder, means to oscillate l I l,

movement of the trip to hold the cam lion oi the trip, Ineans to move said trip in its cooperative dlrection to and beyond the cam lever means,

"beanie said cam lever and hold it against the action of its spring, means to move said trip in its coiiperative direction, and means to stop the iovc'ment of the trip to hold the cam lever in its inactive position against the action of its spring means to guide a thread between the jaws of said clamp.

28. The combination with the pivoted jaws and the sprin for closin said jaw o the cam lever an its spring or normally holding said clamp open, a trip cooperating; with said cam lever, in the movement in one direction of thetri and adapted to release said cam lever an hold it against the action of its spring, means to move said trip in its cooperative direction, means to stop the movement of the trip to hold the cam lever in its inactive position against the action of its spring, and means to cause said trip to continue its movement in the same direction to pass beyond and release said cam lever means to guide a thread between. the jaws of said clamp.

29. The combination with the pivoted jaws and the spring for closing said jaws, of the cam lever and its spring for normallj hold ing said clamp open, a trip cotiperating with said cam lever, in the movement in one direction of the trip, to release said hold it. against the action or its-spring, and inactive in the movement -of thetrip in the opposite direction, means in move said trip in its coiiperative directiommeans to sto the lever inits inactive posit ion against the action of its spring, means to cause said trip to continue its movement in the same direction to pass beyond and release said cam lever, and means to move said trip in its non-cooperating direction to its initial position means to guide a thread between the jaws of said clamp. v

30. The combimltion with the pivoted jaws and the spring for closing said jaws, of the cam lever and its spring for normally holding said clamp open. a trip cotipcrating with said cam lever. in the movement in one directo release said cam lever,

to guide a thread between the jaws of said clamp.

31. The combination with the pivoted jaws and i hc spring for closing said jaws, of the cam lever and its spring for normally holdinn said clamp open, a trip cooperating with said cam lever, in the movement in one direction of the trip. to release said (am lever and inactive in the mo ement in the opposite direction, meansto move said trip in its cooperative direction to and beyond the cam lever, and means to move said trip in its nonooiiperating direciidn to its initial position means to guide thread between the jaws of said clamp.

earn lever and lever and hold it against the action of itsv 32. The combination withthe pivoted jaws and the spring for closing said jaws, ot the cam lever and its spring for normally hold-.

ing said clamp open, a trip pivoted to be active, in the movement in one direction of the trip, and adapted to release said cam 'plpringmeansjto move said trip in its active irection, and means to stop the movement of the trip to hold the cam lever in its inactive position against the action of its spring means to guide a-thread between the jaws ofsaid clamp.

33. The combination with the pivoted jaws and the spring for closing said jaws, of the cam lever and its spring for normally hold-t ing said clamp open, a trip pivoted to be ac tive, in the movement in one directionof the trip, and adapted to release said cam lever and hold it against the action of its spring, means to move said trip in its active direction, means to stop the movement of the trip to hold the cam lever in its inactive posiand release said'cam lever means to guide a 7 tion against the action of its spring, and means to cause said trip to continue its movement in the same direction to passbeyond thread between the jaws of said clam 3d. The combination with the pivote jaws and the spring for closing said jaws,of the cam lever and its spring for normally holda ing said clamp open, a trip pivoted to be active, in the movement in one direction of the between the jaws of said clamp.

trip, 130 against the-action of its spring release said cam lever and hold it and inactive in the movement of the trip in the opposite direction, means to move said trip in its active direction, means to stop the movement of the trip to hold the cam lever in its inactive position against. the action of its spring,

- means to cause said trip to continue its movement in the same direction to pass beyond and release said cam lever, and means to move said trip in its non-active direction to itsinitial position means to guide a thread 35. The combination with the pivoted jaws and the spring for closing said jaws, of the cam lever and its spring for normally h0lding said clamp open, a trip pivoted to be active, in the movement in one direction of the trip, to release said cam lever, and inactive in the movement in the opposite direction, means to move said trip in its active direction to and beyond the-cam lever, and means to move said trip in its non-active direction -,to its initial position means to guide a thread between the jaws of said

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