US1638210A - Thread-using machine - Google Patents

Description

Aug. 9,1927. 1,638,210

C. M. PERKINS THREAD US ING MACHINE Filed May 22, 1922 4 Sheets-Sheet 1 A z3 Z2 Z7 0 y l! l 16 J 7 7 i 14.1.9

nn I IllIl-Illll Aug. 9,1927. 1,638,210

C. M. PERKINS THREAD USING MACHINE Filed May 22, 1922 4 Sht-ebS---Sheell L-; ,if v

Allg. 99 C. M. PERKINS THREAD US I NG MACHI NE Filed May 22, 1922 4 Sheets-Sheet 3 CZcz/Zesf @riz/176,

5551;., MAA! Hlm.

' 1,638,210 Allg- 9 1927' c. M. PERKINS THREAD USING MACHINE Filed Mag 22, 1922 4 Sheets-Sheet 4 c .ZZ

Patented Aug. 9, 1927.

UNTE STATES CHARLES M. PERKINS, OF COI-ICES, NEVI YORK.

THREAD-USING MACHINE.

Application led May 22,

This invention relates particularly to an automatic knot and slug detecting and stop motion device for multiple thread machines, wherein provision is made for the automatic operation of stop mechanism for the machine through the presence of a knot or other imperfection in any thread or threads drawn from the spools.

The invention is particularly designed for application to a machine set and maintained in motion througl the manual operation and holding of an appropriate treadle or the like, the presence of a knot or similar imperfection in the thread or threads being used, automatically actuating means to disconnect the treadlo from operative control of the mecl'ianism, and therebyy permit such mecha'- nism to act as a stop motion.

An important object of the present invention is the provision of thread guides, through which the thread passes, and Which are adapted to be actuated by the presence of a knot or other imperfection in the thread. These guides are constructed so that one at least is somewhat more sensitive and quickly responsive to thread imperfection than the others, whereby provision is made for taking care of threads having sensitive tension adjustments, as are necessary in some stitching operations.

fi. further object of the invention is the provision of a release mechanism involving a trip mechanism, the release mechanism provided with normally set for the manual control of ordinary sewing machine stop mechanism, the release mechanism including a trip, which when operated, causes the release mechanism to interrupt the manual control of the stop mechanism, and thereby release the stop mechanism for effective operation. The trip mechanism, Which is arranged intermediate the thread guides and trip of the release mechanism, is automatically set in motion by the movement of the thread guide due to a thread imperfection, to operate the. trip and set the release mechanism in operation.

'he trip mechanism is Within control of the manual means through Which Vthe machine is normally' governed, so that following an automatic action of the trip mechanism, through a thread imperfection, the manually operable means will restore and automatically set the trip mechanism for succeeding automatic control.

in important detail of the present inven- 1922. Serial No. 562,799.

tion is the arraagementl of the trip mechanism, which the thread directly governs for the operation of thc release mechanism, so that following automatic action of such trip mechanism, the thread guide is free to continue its movement in the direction of the thread movement, and formed so that in such continued movement, the thread and obstruction thereon is permit-ted to freely pass the thread guide, thus'the thread and obstruction will pass by the thread guide without undue tension on the thread, and there is little liability of thread breakage or disturbance of adjustments resultant from undue tension on the thread.

ri`he release mechanism is adapted to be actuated by the power table shaft, which dr'vcs the machine to be stopped, and is thereby instantly responsive to the control resultant from a tread imperfection passing through the thread guide, the parts, following the release movement, tending to resume a normal position in so far as permitted by cocperatng parts, to thereby provide for resetting the machine merely through the operation of the foot treadle or the like.y

ln the drawings:

Fig. l is a view in elevation partly in section, illustrating the improvement with the parts shown in connected relation, and the stop motion indica-ted in release and stop positions in full and dotted linesre- Fig. 6 is a section on line 6-6 of Fig. 5.

Fig'. 7 is a View similar to Fig. 6. the thread uide being shown in position resultant from a. knot in the thread, and the catch of the trip mechansm being shown released.

Fig. 8 is a section on line 8-8 of Fig. 5.

Fig. 9 is a Section on line 9-9 of Fig. 5.

Fig. 10 is a perspective detail showing the means for actuating the thread guides of the plural arrangement through the release of the trip mechanism following the operation of the sensitive thread guide.

Fig. il .is a view in elevation partly in lill section, illustrating the sto'p motion release means and the connection between the same and the trip mechanism, the parts being in normal positions.

Fig. 12 is a similar view with the parts in operative positions, and the connection to the stop motion in release posi-tion.

Fig. 13 is a perspective view showing the arrangement of the bars connected to the stop motion and to the treadle, the interlocking bar being shown in position to release the stop motion bar.

Fig. 14 is a horizontal sectional view illustrating the release mechanism and the connection between thc Same land the stop inotion.

Fig. 15 is a broken View in elevation for the trip resetting means, the resetting pawl being shown in initial resetting position in dotted lines.

Fig. 16 is a similar View. the resetting pawl being shown in position assumed immediately fol'lowing the resetting operation.

Fig. 17 is a perspective View illustrating the resetting pawl and guide therefor in relation to t-he resetting member of the trip mechanism.

Fig. 18 is a perspective View of one wall of the guide for the resetting paWl.

Fig. 19 is a perspective view of the resetting pawl and the connection between the same and the operating treadle.

The present invention involves the specitic construction and the combi-native relation of several distinctive instrumentalities, which will be hereinafter described in the order named, and which may be briefly referred to as thread guides, through Which the threads pass, and which are operated by any knot or imperfection in any of the threads; a trip mechanism released in the operation of the thread guides for a free operative and preferably gravital movement; a release mechanisni which is brought into operation by and following the operative movement of the trip mechanism and a stop motion of approved or conventional design, Which is automatically set in motion -to stop the machine through actuation of the release mechanism. The thread guides and trip mechanism are supported `above the bed plate of the machine; and comprise a Standard 1 rising from said bed plate, to which is secured at the upper end a hollow rectangular frame 2. Ears 3 depend from the respective ends of the frame and rotatably support a trip shaft 4. Collars 5 and 6 are secured in spaced relation upon the shaft 4, from each of which extend tubular projections 7, adapted to adjustably receive, through set screws 8, rods 9. A plate 10 is carried by the upper ends of the rods 9, the upper edge of the plate being formed with V-shaped notches 11.

An inverted U-shaped strip 12 is frictionally engaged over the upper edge of plate 10, said strip 12 being formed in the lower edges with V-notches 13, cooperating with the notches 11, to thereby form thread openings, through which the thread passes. Plates 1() and 12 are here shown as formed with vtour thread openings, these plates constituting a thread guide fr the reception of a plurality of threads, it being understood of course that any number of thread openines may be formed therein. An additional independent thread guide, designed particnlarlj,v for more sensitive operation than the thread guides previously described, is also mounted on the shaft 4, and comprises a sleeve l-r freely rotatable on the shaft, from wheli extends a. tubular projection 15 adjustably receiving a rod 1G formed at the` upper endy with divergent lingers 17, which at their juncture is formed with a slot 18, the width ofv thread diameter. The sleeve 14 is of reduced diameter at one end as at 19, and this reduced portion is formed in part of a square or plain face 20, to receive the upper laterally projected end 21 of a latch 22.

is secured in one of the ears 3 and cifilcd about and connected to the shaft fl. this spring serving to normally hold the respective thread guides in the upright or operative positions. one or' the tubular projections 7 and exten-ds to and in rear of the projection 15, whereby wlien the thread guides in the plates 10 and 1L. are operated by a knot or other imperfection in the thread, the thread guides 17 will also be operated by the rod 24, though the thread guides 17 may be independently operated by lthe thread passing therethrough, as `will be apparent from the drawings and description. This construction permits the use of the device in a mu ti-thread machine, of which one particular thread is of such a nature, as by material or required tension, that .the means resultant from the attempt of an 1mperfection in that thread to pass, must be extremely sensitive. The independent thread guide is thus more sensitive than the remaining thread guides.

lfhe trip mechanism is controlled by the atch 22 and comprises a rod 25 slidably mounted in guides 2b, projecting from the standard 1, the upper end of the rod having a block 2'? removably secured thereon by a set screw 28, to which block the latch ren'iovably secured at 25). A weight 30 is adjustably secured upon rod 25 by a set screw 31. this weight causing the red 25 to move downwardly when the latch 22 is released, the adjustment of the weight providing for limiting this downward movement of the rod to the desired extent through cooperation of said weight in one of the guides 2'3. The lower end of the rod is provided with a block adjustably secured thereon, and formed with outstanding lug 33, through which il;

A spr A rod 24 is secured to 1' threaded a screw 34. The end of the screw is adapted to engage one end of a lever pivotally supported on a lug 36, rising from the bed plate, the opposite end of the lever having a loose connection Wit-h a pull rod 37. rThe pull rod is adapted to operate the trip lever of the release mechanism to be later described, and the extent of this operation can be readily controlled through adjustment of the screw 34. The block 27 on the upper end of the rod 25 is provided With an upwardly extending member 38 slotted at 39 to receive a pin 4() projecting from a collar 4l, Secured upon shaft 4.

The release mechanism proper is mounted upon a frame tixed to the under side of the bed plate ot' the machine, and comprises a plate 43 with a depending Web 44. A shaft 45 is supported in suitable bearing bosses projecting from the web 44, and is provided at one end with a pulley 4G adapted to be connected by belt 47 operatedy from a suitable pulley 48 on the povvcr table shaft. 'lhe opposite end of the shaft 45 is provided with a. serrated or toothed disc 49, which disc from its connection with the shaft, is also continuously operated. Pivotally supported in the web 44 above the shaft 45 is the inner end of a release lever 50, the outer or free end of which pivotally supports at 5l a pawl 52, the tooth formed end 53 of which is in line with the toothed edge ot' the disc 49. The pawl 52 ha.; an arm extension 54 projecting toward the pivot of the lever 50, this arm extension 54 being connected to the pull rod 37. The pawl 52 is supported upon a stud, which stud has an extension. The end of the stud beyond the pawl is Slotted and a spring is coiled about the stud with one end seated in the slot, the opposite end engaging behind the projection. Thus, the spring may be adjusted by turning the stud, a set screw holding the stud in adjusted position. A stop 55 is arranged to limit the dista-nce 2 of the toothed end 53 of the pawl 52 from the disc 49. By turning the head 57, the limit positionot' the lever is obviously adjustable. The inner or pivotally connectedi end of the lever has a depending project-ioni 58, which through the medium of a link 59j is connected to an interlocking bar 60. which! extends through a suitable guide opening in| a bracket 6l, secured to or forming part of l the release mechanism fra-me. This bracket 6l slidabljv supports a bar 62, which is di-i rectly connected, as through a rod 63, with al treadle or other manual pressure means (not: shown). A similar bar 64 is slidably mount-l ed in the bracket Gl and this bar 64 is, through the medium of a rod link 65, con-l nected to the end of arm of a clutch lever of the stop motion to be later referred to.

The pan/'l 52 is tensioned to insure its proper movement by spring 55, While spring 55 acts to normally maintain proper relation between the pawl and lever 50 when the parts are Ain inoperative positions.

In the normal positions or' the parts, the free end of the release levcr 50 is resting upon the adjust-able stop 57, and the interlocking bar 6() is in normal or operative position. In this position, the Said bar extends through an opening 66 in the treadle connected bar G2, and also ior an appropriate length into an opening 67 in the clutch lever operating-bar 64. Thus with the interlocking bar (30 in normal position, the bars 62 and 64 are actuated as a unit in the depression ot' the treadle or similar member, but on the Withdrawal of the interlocking bar from its connection With the clutch lever operating bar 64, the latter is free to move for a purpose to be hereinafter referred to.

The interlocking bar 60, which is the bar which controls the interlocking cooperation between the bars 62 and 64, permits manual operation of the bar 62, after the bar 64 is t'rz'ed. This manual operation of the bar 62, which so long as the bars 62 and 64 are connected by the interlocking bar 60, serves to start and stop the machine. at the will ol the operator, is utilized following an automatic action of the stop motion, duc to thread imperfection, to reset the parts, and particulz-irly the thread guides and trip mechanism described.

For this resetting of the thread guides and trip mechanism, the bar 62 is connected to a rod 68, which extends through the bed plate of the machine, and is provided with an enlarged end 69, in Which is pivotally supported a pawl 70, a spring 7l being coiled about thel enlarged end 69 and engaging the pawl to hold the same in Substantial alignment With the rod. A paWl guide 72 is mounted on the bed plate to one side of the pawl .and has an offset bend 73 therein, so that the upper portion of the guide is vertically offset from the lower portion. The guide includes a plate 74 secured at its upper end to the guide proper and depending from such upper end in spaced relation to the guide proper to provide a channel 75 to slidably receive pin 76 projecting from the paWl 70. The `'plate 74 is formed With an opening 77 at the upper limit of movement ot' the pawl, lof a size to permit the pin to pass theref jthrough, the lower end of the plate ter minating above the odset 73 ot' the guide proper, so as to permit the pin, when riding Aon the offset, to be guided thereby outwardly beyond the plate 74. The block 32 .on the side next the pawl 70, is formed near its upper end with a` projection'78 having an undercut bottom Wall 79, and the upper end of the paWl is inclined at 8O to correspond With the undercut projection. It 'may be here stated that in the normal conill) Il U

trol by the operator of the starting and stopping of the machine, the lowest limit of movement of the pin 76 is above the offset 73, so that the pin merely reciprocates in the space between the guide proper and plate 74, but that following automatic operation of the stop motion, the pawl is moved to a lower position, se that the pin 76 is guided ont by the offset 73, thereby positioning the end of the pawl beneath and interlocking' the same with the under-cut projection 78 of the block On the upwart. movement of the treadle, the pawl operates to lift the lilock and restore the trip mechanism, whereupon the spring 71 restores the pawl to its normal substantially vertical position, direngaging the pawl from the block 32. llhen the pawl raises the mechan`sm and the latch 22 properly cooperates with the plain face 2U and maintains this cooperation, the pawl will leave the undercut 78 and through the action of spring 7l return to normal positon, the pin 76 riding through the opel "7 If however,

l. due to a too sensitive atiustment or a in the operation, the latch 22 does not properly engage the surface 20, the undercut projection 78 will hold the pawl 70 against the action of the spring 71, and es the treadle f' moves downward, the trip mechanism will follow and thus automatically trip the stop mechanism before the clutch has been engaged. Thus until the operation is such that the latch 22 is properly in position, no startingl operation is had. In order that the operation of the mechanism described may be better understood, it is deemed advisable to describe a conventional and well known type of stop motion. rThis stop motion includes a shaft 8l held against movement in brackets 82 secured to and depending from the bed plate. On this shaft is loosely mounted a clutch member including a clutch face S3, a brake disk 84, secured to such clutch face, a pulley 85, from which a belt- 86 extends to operate the particular sewing machine with which the improved mechanism is associated, and a thrust collar 87.

A cooperating clutch member is also mounted on the shaft 81, including a clutch section 88 to cooperate with the clutch face 83, and a connected belt wheel 89 to be operated from the line shaft, which shaft may be connnon to a number of machines. A lever 90 is pivotally supported on a bracket 91, depending from the bed plate and is provided with an arm 92, carrying a brake member 93 to cooperate with the brake ldisk 84, Aa thrust arm 94 bifurcated to straddle shaft 8l and cooperate with thrust collar 87, and an arm 95 projecting oppositely from arm 92 with respect to the pivot. The arm 95 is connected to the bar 64 through the rod link 65 previously referred to. A spring 96 connects the lever 9() with the bed plate, said spring normally influencing the lever for movement in the direction to apply the brake 93 and release the pressure of the thrust arm 94 on the thrustcollar 87 and thereby permit disengagement of the clutch members 83-88.

Assuming the parts to be constructed and arranged as described, it is apparent that a knot or other imperiection in the thread passing through any of the thread guides will move said guides in the direction of travel of the thread. If the imperfection exists in the sensitive thread guide 17, this guide ill be turned on the shaft 4 a center until the plain. portion 2O of the sleeve eat-ension 19 will ride from beneath the latch 22. This permits rod 25 to move downwardly under the influence of weight 30 and all of its contained parts and exert an upward pull on the connector 37, through lever 35. The downward movement of the rod 25 through member 38 and pin 40, turns the shaft 4 againstl the tension of the spring 23, thus turning the thread guides in plate l0. l f however, the thread having the imperfection is one passing through the thread guides in the plate l0, said guides will be tilted by the thread, and arm 24 will cause a corresponding movement of the thread guide 17,

thereby releasing the latch 22 with the result described. As connection 37 is drawn upwardly, the pawl 52 is operated to cause the tooth end 53 thereof to engage one of the teeth of the dise 49. As this disc is continuously operated from the power shaft, the connection of the pawl thereto raises the free end of lever 50 until the arm 54 of pawl 52 engages the stop 97, whereupon the pawl is forced from engagement with the tooth disc. This movement of the lever 50 will, through the link 59, draw the interlocking bar 60 from the bar 64, whereupon the spring 96 immediately acts to free the clutch 83-88 and apply the brake 93. This sto-ps the movement of band pulley 85 and so stops the articular' machine.

As the bar 64- is thus moved by the spring 9G, the opening 67 therein is out of alignment with the interlocking bar 60, and hence the spring 55, which tends to restore the lever 50 to normal position, cannot fully return said lever. The operator regains control of the machine and simultaneously resets the trip mechanism and thread guides, by moving the operating treadle first downwardly to cause the pawl 70 to loci; beneath the offset 7 8 of the block 32, which block is now of course in lowered position, then moves the treadle upwardly, thereby moving the rod 25 to a position to cause the latch 22 to again engage ,the plain portion 2O of the sleeve member of the sensitive thread guide, and at the same time moving the bar G2, and connected interlocking bar 60 upwardly, until said interlocking bar aligns with the all) llO

lil() opening 67 in the har 64. The spring 55 then tends, through the lever 50, to move the interlocking bar (5t) to engage the open infr (i7 in the bar di. The bars G2 and 64 are again connected, whereupon the operator, by the continued moven'ient or' the pedal in the downward directit'in, operates the lever tl() to release the breite l cause the clutch members SIL-'o8 to be engaged through pressure ot' the thrust arm on collar Si. The machine is thus started. and within complete control ot' the operator for stopping and starting at. will.

lt is to be particularly noted that when a thread guide has been operated and the latch released, the thread guide shaft seeks to return to normal position under the influence ot' the spring 23. This. spring however, is insuiticient to hold the thread guides in normal position against the continued pull otl a thread, and hence following the automatic trip through a hnot or other imperteetion in the thread, said guides will tilt to a position to permit the thread hnot or other imperfection to pass through the guide without a material interruption ot the thread movement. yThis is impm'tant as thereby there is little or no interruption to the normal travel oi the thread, and hence' there has been no undue tension placed upon the thread for the actuation olf the released mechanism. The thread guide movement is naturally a sensitive one, and the engagement. of the latch .22 is also so delicately balanced that the presence of a knot or other imperfection will cause the. necessary release of the trip mechanism entirely without stopping the travel of the thread. The automatic top motion is thereat'ter wholly independent otA the thread, and hence the thread is not broken nor its tension interfered with in order lo secure an operation ol' the stop motion.

A spring 99 is secured upon a stud 10() on collar 5 which is adjustable on the trip shaft, one end of this spring being arranged in t'ront oi one of the tubular supports 7 and the opposite end in front ot' the tubular support 15 ot' the sensitive thread guide. ln the operation of the sensitive thread guide alone, this spring acts to return said guide to an operative relation to the remaining thread guides.

Claims:

1. A stop member for thread using machines, a separate continuously operated power element, manually operable starting means, a connector between said starting means and stop element to actuate the stop element to release position in the movement oi' the starting means, a lever for operating the connector, and means carried by said lever and actuated by a defect in the thread of the machine to cause lever to be operated by the separate continuously operated power element to move the connector to release the stop means.

2. A stop means for thread using machines, a manually operable starting means. a movable connector between said means, a lever .secured to said connector, a power driven toothed disc, a pawl carried by said lever to cooperate with said disc, and means controlled by a thread defect tor moving said pawl into cooperation with said disc.

Si. A stop means Vfor thread usingmachines, a manually operable starting means` a movable connector between said means, a lever secured to said connector, a power driven toothed disc, a pawl carried by said lever to cooperate with said disc, a lever operated by a defect in the thread, and a connection between said lever and pawl to operate the pawl in the n'iovement of the trip lever, said connection freeing the lever for further movement in the thread feeding direction to release the thread obstruction.

4. A stop means tor thread using inachines. a uranually operable starting means, a movable connector between said means, a lever secured to said connector, a power driven toothed disc. a pawl carried by said lever to cooperate with said disc, a lever operated by a detect in the thread, and a connection between said lever and pawl to operate the pawl in the movement of the lever, and means to disconnect the pawl from the disc tolhiwing a predetermined movement o l' said lever.

5. A stop means t'or thread using` machines, a manually operable st arting` means. a movable connector between said means, a lever secured to said connector, a power driven toothed disc, a pawl carried by said lever to cooperate with said disc, a lever operated by a del'ect in the thread, and a connection between said lever and pawl to operate the pawl in the movement of the lever, and means to return said connector to normal position.

6. A stop means for thread using machines, a manually operable starting means. a. movable connector between said means. a lever secured to said connector, a power driven toothed disc, a pawl carried by said lever to cooperate with said disc, a tripping mechanism operated by a defect in the thread, and a connection between said tripping mechanism and pawl to operate the pawl in the movement oi' said mechanism. means to return said mechanism to normal position, and an adiustable step to limit the normal position of the lever.

7. In a multi-thread using machine, an automatically operable stop motion, manually operable means for controlling the stop motion. and mechanism whereby the stop motion is released from the manually operable means for automatic actuation by the imperfection of a thread, said mecha- .llo

titl

nism including a plurality of thread guides movable to set said mechanism in operation when an imperfection in any of the threads in said guides is presented to a guide, one of said guides being more sensitive than the others.

8. In a multi-thread using machine, an automatically operable stop motion, manually operable means for controlling the 2 stop motion, and mechanism whereby the stop motion is released from the manually operable means for automatic actuation by the imperfection of a thread, said mechanism including a shaft, a plural thread guide secured on the shaft, an independent thread guide mounted for free movement on the shaft, and a connection whereby movement of the plural thread guide operates the independent thread guide.

9. In a multi-thread using machine, an automatically operable stop motion, manually operable means for controlling the stop motion, and mechanism whereby the stop motion is released from the manually operable means for automatic actuation by the imperfection of a thread, said mechanism including a tripping means operated by gravity to inaugurate the stop motion release, a latch for holding the trip mechanism against the iniuence of gravity, a multiple thread guide normally engaging said latch, and means to permit movement of the guide to release the latch in the attempt of an imperfection in the thread to pass through sai guide.

10. In a multi-thread using machine, an automatically operable stop motion, manually operable means for controlling the stop motion, and mechanism whereby the stop motion is released from the manually operable means for automatic actuation by the imperfection of a thread, said mechanism including a thread guide shaft, a plural thread guide fixed on said shaft, an independent guide Inounted on said shaft, a connection whereby movement of the plural thread guide operates the. independent thread guide, a tripping mechanism to inaugurate the stop motion release, and a latch cooperating with the independent thread guide to hold the tripping mechanism from operative movement under normal conditions.

11. ln a multi-thread using machine, an automatically operable stop motion, manually operable means for controlling the stop motion, and mechanism whereby the stop motion is released from the manually operable means for automatic actuation by the imperfection of a thread, said mechanism including a plurality of thread guides, a trip mechanism released in the thread operation of any of said guides to inaugurate the stop motion release, said manually operable means being movable to regain control of the stop motion following the automatic actuation of the latter, and means whereby said movement of the manually operable means automatically resets the tripping mechanism in normal relation to the thread guides.

12. ln a stop motion for automatically stopping when a defect in the used thread contacts with a detector, tripping means controlled by the detector to stop the thread using mechanism, means for restoring the tripping means to operative position by motion in one direction, a separate means for holding the tripping means in operative position, means for moving the restoring means from the path of the tripping means by a reverse motion of said restoring means, said reverse motion positioning the tripping means to permit continued operation of the thread mechanism.

3. A trip mechanism including an upright, a shaft supported thereon, a series of thread detecting means arranged on said shaft, an operating` trip element supported for movement lengthwise the upright, and a latch carried by said element and cooperating with one of said members to hold the trip element against movement.

14. A trip mechanism including an upright, a shaft supporte-d thereon, a series of thread detecting means arranged on said shaft, an operating trip element supported for movement lengthwise the upright, and a latch carried by said element and cooperating with one of said members to hold the trip element against moven'ient, said latch being released by movement of any of said members under a thread defect.

15, A trip mechanism including an upright, a shaft supported thereon, a series of thread detecting means arranged on said shaft, an operating trip element supported for movement lengthwise the upright, and a latch carried by said element and cooperating with one of said members to hold the trip element against movement, said latch being released by movement of any of said members under a thread defect, and manually operable means for moving the element to position the latch in cooperation with said member.

16. A trip mechanism including a movable element adapted at one limit of movement to operate control means, a latch for holding the element against movement, and thread detector mechanism serving when operated to release the latch, said detector mechanism including a plurality of thread receiving elements to be actuated by thread imperfection, one of said elements controlling the latch, the others of said elements controlling the latch through the first mentioned element.

17. A trip mechanism including a movable element adapted at one limit of movement to operate control means, a latch for holding the element against movement,` and llo thread detector mechanism serving when op erated to release the latch, said mechanisni including a thread imperfection detector di rectliv cooperating with the latch` and an additional thread imperfection detector indirectl;y coope 'ating with the latch.

18. A trip mechanism including' a mor able element adapted at one limit ot more nient to operate control means. a latch tor holding' the element against movement, and thread 'letector iiieelnxliism :serving when on erated to release the latch` Said mechanism including?y a plnralitj; ol' thread impert'ei tion detector elements, and means to render one ol'` said thread imi'vertection detectin ;T elements more sen, 'fre to thread 'iinpeil'eiAA tion in latch control than the others.

19. trip mechanism including` a n1o\v4 ahle element adapted at one limit ot movement to operate control mean, a latch l'or holding the element aggaiirft inox'ennent. and thread detector mechaniean serving' when eperated to release the latch. :aid niemianir'mi including a thread imperfection detector adapted i'or swingingT movement nader :i thread imperfection. and means carried Said detector to engage and support the latch when the detector is in normal position and release, the latch when the detector is in operative position, and additional thread imperfection detectors serving when operated to actnatc the tiret mentioned detector and therebyv release the latch.

20. A trip mechanieni including;v a movahle element adapted at one limit ot more ment to operate con rol lucana. a latch tor holding' the element aga t lilou-nient. and thread detector mechai :ii serving when oil;- erated to relea; c the `..tcln said meciiffnisni including' a thread imperl'ection detector directly ff'ontrolling the latch. and a second thread iiniau'i'ectimi detector adapted in oierrtion to engage and operate the tiret mentionetl detector to tl'iertfrl)v control the latch.

2l, trip mech/.i m inclml'ng' a mov zahle element adapteri at one, limit oil more ment to oli/crate control meana, a latch for holdingl the element :xeainr-t movement. and thread detecta nel hrzniam ywerving` when operated to releape the hteh vid niechaniszm includingl a thread iingierfeeti-.n detector diR rectljiv controlling' the latch. and another thre; d imperiectimi detector haring; a roll adapted in operation to. engage Sait lirst mentioned detector to therein' actuale the latch.

ln testimoni' whe t ly l ilix my signature.

Images