US1483307A - Thread trimmer for sewing machines - Google Patents

Description

Feb. 12 .1924.

J; KlEwxcZ THREAD TIMMER FOR SEWING MACHINES Filed April 15 1922 8 Sheets-Sheet 1 mg #M Anya Feb. 12' A1924. 1,433,307

J. KIEWICZ THREAD TRIMMER FOR SEWING MACHINES Filed April 15. 1922 a sheets-sheei; 2

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Per). .12 y 1924. 1,483,307

J. KnEwncz THREAD TRIMMER FOR SEWING MACHINES l Filed April l5, 1922 8 Sheets-Sheet 3 Fig@ nvencw. John Kewcg Awys.

Feb. 12 1924.

AW J. KlEwncz THREAD TRIMMER FOR SEWING MACHINES Filed April l5. 1922 Fig..

8 Shees-Sheei; 'i

Feb. 12 1924. 1,483,307

J. KlEwlcz THREAD TRIMMER FOR SEWING MACHINES Filed April 15", 1922 8 sheets-sheet s Figa \nvenTo1.

John Ki ewcg byW/ Mfw Anya Feb. 12v 1924. 1,483,307

J. KlEwlcz THREAD TRIMMER FOR SEWING MACHINES Filed April 15. 1922 sweets-sheet s Flgj. 4s 6) da r-l 3&39 4| lao l I lnvenTc'T. John Kewicg AIys'.

EFQM@ y .1924s I .J- KIEWICZ THREAD TRIMMER FOR SEWING MACHINES Filed April l5. 1922 8 SheeS--Sheeb 7 Fig'. 10

Feb, 12' 1924a 1,483,307 J. -Klrwlcz THREAD TRIMMER FOR SEWING MACHINES Filed April 15, 1922 s sneeuw-sheet a @e En@ 78 [I I j `ln'vfianor.

' liso 46 mo \9 John Kewcg Patented Feb. 12, Nidda lytlflyftl JOHN KIEW'ICZ, OF BOSTON, MASSACHUSETTS, ASS'JGNOR T0 THE REECE BUTTON' HOLE MACHJINE CGMPANY, Ol? BOSTON, ll/lIASEACHUSETTS, A. URPORATICN F MANE.

dapplication tiled. april l5, 195m. Serial No. 552,926.

.To all eli/0m @'25 may concern.'

Be it known thatl l, doi-iin lilinwicz, a citizen of the United States, and residing1 at Bosten, county of Suffolk, State of Massachusette, have invented an )improvement .in

Thread Trimmers for Sewing1 Machinesyof which the following description, in connection with the accompanying drawing9 ie a specification, like characters on the drawing 1o representing` like parts.

This invention relates to sewing machines of the type adapted to sew a short Seam and then come to rest and particularly to a thread trimmin[QJ- device arranged to trim the thread at the end of the seam. rlhe thread trimmer is of that lrnown type which is constructed to cut the thread at the end ot the Seam and to hold the needle thread until after the stitching on the next seam has begun and then to cut the thread fragment which has been enga-ged by the thread. holder thus leaving the thread which is trimmed closely to the wort; at both ends of the seam.

One feature of the invention relates to a novel thread trimming meane which is controlled by the stop motion by which the sewing machine is brought to rest at the end of the seam.

ln the sewing machine herein illustrated the driving mechanism therefor comprises a fast pulley and a loose pulley with a belt Shipper for Shifting the driving belt from one pulley to the other.'a and one feature of et the invention relates to a thread cutting device which actuated from the looee pulley after the driving belt has been shifted onto it at the finish of the seam.

Another feature of the invention relates a0 to a thread cutter for a two-thread sewing' machine which is provided with means for cutting both the upper thread above the work and the under thread beneath the work9 both of which cutting devices are controlled by the stop motion and are actuated by the rotation of the loose pulley after "fthe driving1 belt has been shifted onto it.

Another feature of the invention relates to a thread trimming; device which is ar- 50 ranged to cut the thread twice, once at the end of the seem and again after the next seam has been etardj the eecond cutting being for the purpose of trimming the thread fragment held by the holding means.

Other features of my invention relate to various improvements in thread cutting devices all. as will be more fully hereinafter eet forth.

lin order to give an understanding of the invention l have illustrated in the drawings a selected embodiment thereof which will now be described after which the novel features will be pointed out in the appended claims` Fig. l ie a side view of a sewing machine havingmy improved thread trimmer applied thereto.

lliig. 2 is an under side view of the bed plate of the sewing machine with some of the sewinglg` machine parte omitted.

Fig. 3 is an end view of the head.

l? i g. 4; is a fragmentary view of the cutter actuating-3; mechanism.

lig. 5 is a top plan view of the part shown in lFig. fl.

Fig. 6 is a fragmentary view of the latch for operatively connecting the parts to the loose pulley.

Fig. 7 isa top plan view of the clamp plate with the upper thread trimmer.

Fig. 8 is a side View thereof looking from the top of the sheet.

Fig'. 9 is an under side View of the part shown in Fig. 8.

Fig. l() is a view Showing' the under 'thread trimmer.

Fig; ll ie an under `eide view of the plate shown in Fig. 10.

F 12 is a Section on the line 12-l2, Fig. ll.

Fig. 13 is a section on substantially the line l3-13, Fig. 5.

Fig. le is a detail of the latch 56.

Figs. l5, 16 and 17 are views showing the position of the parts comprising the upper thread cutter at different points: in the cycle of operations.

Fig. i8 is a modified form of the slide for pulling; off the under thread and drawing,` it against the knife.

Fig. 19 is a detail view of the means for relieving the clamping pressure on the work after the thread-trimming; operation is completed. v

Fig. 2O is a. detail of the arm 36.

I have illustrated the invention herein as it might be applied to a sewing machine havintrar some of' the features illustrated in United States Patents No. 749,776, Jan. 19, 1,904, No. 1,088,652, Feb. 24, 1915i, and No. 1,402,073, Jan. a, i922.

I desire to have it understood, however, that the vinvention is not limited to use in connection with sewing machines such as shown in these patents but may be equally ywell embodied in other types of sewing machines.

`The sewing; machine herein illustrated comprises a bed 1 which is pivotally supported on a base 2 and which carries an overhanging arm that supports the vertically-reciprocating needle bar 4f, the latter supporting the usual needle 5. The work in which the short seam is to be sewed, is retained in place by a suitable wOrk-holdin gl means comprising` a. clamp plate 6 that is slidable back and forth in ways 7 formed in the bed 1, and two work clamps 8 and 9 which operate to clamp the work to the clamp plate 6.

The sewing machine herein shown is of the two-thread type and it embodies in its construction a bobbin carrier or shuttle situated beneath the Work clamp and a rotary hook for carrying the loop oi: needle thread around the shuttle` as usual in two-thread sewing machines. The shuttle and rotary hook are not illustrated in detail as they may have any suitable or usual construction but are shown generally at 10. The needle and the hook are both operated from a driving shaft 11 which is journalled in the bed plate 1. The connections between the dri ingV shaft 11 and the needle bar 4 are or may be all as shown in the above-menti med patents and, therefore, do not need to be described herein.

The rotary hook is driven from the sha/tt 12, which is connected by bevelled gears 13 with a cross shaft 1l, the latter being` connected by bevelled gears 15 with the driving, shaft 11. These gears are constructed to cause the hook to rotate in proper timedrelation with the reciprocations ot the needle.

The driving means herein shown for actuating the driving shaft comprises a driving belt 16 and fast and loose pulleys 17 and 18, vthe pulley 17 beingfast on the driving shaft 11 and the pulley 18 constitutinga loose pulley. The machine is started by shifting the belt 16 from the loose pulley 1S to the fast pulley 17 and is stopped by shift ing the belt 'from the fast to the loose pulley. The belt is shifted by a belt shipper 19 and the operation of the latter is controlled by a stop motion operating` somewhat similar to that illust-rated in the above-mentioned patents. This stop motion comprises a bracket arm 2G carried on a rock shaft 21 which vis slidable longitudinally and is subject to the action of a spring' tending to move it longitudinally toward the right Fig. 2. This bracket arm 2O cay ries an extension which engages lthe belt shipper 19 so that when the bracket arm 20 and the rock shaitt 21 are moved to the right Fig. Q under the influence of the spring Q9 the belt 1() will be shifted from tht tast to the loose. pulley. The stop i. also includes a stop cam 2l fast on fing shat't l1 and co-opcrating with a dog; .25 slidably mouiited in the braclwt arm Q0 and acted on by a silningg :26. The bracket arm 2O is also acted on by a sprinnj-prcssed plunger S27' which tends to hold it in the position shown in Fin'. said plunger hai'- inn; the spring Q9 associated therewith which resists upward movement ot the plungi'cr 27. lll'hen the sewing' machine. is running tho ln'acket arm 2O will be in the dotted line position F' 1, and in this position the stop den' is on the inside of the stop cam 24 and is frei.. therefrom. i\t the end of the sewing; operation the catch or trip holding the stop motion in its inoperative position is released and the spring' Q2 acts to shift the rock shatt 21 and the bracket arm Q() towards the right Figs. l and 2 into a position where the stop dog` Q5 comes in the path et the stop cam 2l, which is turning in the direction ot the arrow in Fig'. f1. This stop cam has the rise 29., the valley 30 beyond the rise, and the stop tace ll at one side o'f' the valley. lllhen the shalt 21 with its bracket arm has been shifted into the position shown in ifi the stop dog' Q5 conn-s onto the lower portion oi? the stop cam 2f and as the cam rotates the high portionv Q9 of' the cam passes under the stop dogr thereby swingingr the bracket arm 72() upwardly about the rock shaft 9.1 and against the action oli the spring- 2S. The resistance of the springl QS scrvcs a brake to check the momentum ot the parts and as the stop dog passes over thc l l 'i' ""9 of the cani and drops into the i it will nicct thc slop 'acc ill ol' the k'up can. thus ln'i'nginir the paris to rest. mi stop dog; is backed by the spring' 2G vince the he impact oit the tace Ill against said stop dogg' will compress the spring; 26 slightly thus gf ne; a cushioned stopping' movement.

lt will be remeinlnred that the brackct `rm Q0 has the extension which engages the belt shipper 19 and hence the movement of the bracket arm 2() and rock .shaft .21 from the dotted line position Fig. l into the. i'ull line position will operate through the extension Q3 to shift the belt 1G iroui the. tast to the loose pulley, and after the belt has been hns shifted onto the loose pulley the stop cam operates to bring the machine to rest at a i,rn'edetermined point in the cycle ot operations. all as usual in machines of this type.

The parts thus far described are, or may be, all as usual in sewing machines of this type and in many respects are similar to the constructions illustrated in the abovementioned patents.

One feature of the present invention relates to a thread cutter for the upper thread which is controlled by the stop motion and which is actuated by the loose pulley 18 after the driving belt has been shifted onto it. Another feature of the invention is an under thread cutter similarly controlled and actuated.

The upper thread cutter is associated with the work clamp and is indicated at 32. 1t is in the form of a blade having a cutting edge 33 and carried by a lever 34 pivoted at on a resilient plate or arm 36 secured at its rear end to the clamp plate 6 and at the forward end 161 extending beneath the clamp 8. The cutting edge 33 of the cutter operates directly beneath the work clamp 8 and at the end of each sewing operation9 the lever 341 is swung into the position shown in Fig. 17 thereby to sever the thread. The means for operating the cutter 32 will be presently described.

Associated with the thread cutter is a thread gripper 37 in the form of a hook which is carried at the end of a lever 33 pivoted at 39 to the arm 36. This gripper operates just above the end 161 of the arm 36 and between the latter and a spring gripping plate 40.

The machine herein shown is adapted to sew buttonholes and in the operation thereof the clamp plate 6 has a feeding movement first in one direction and then in the other to feed the work for the 'formation of the stitches along first one side and then the other of the buttonhole. At the beginning of the buttonhole the parts are in the position shown in Fig. 15, and as the stitching begins the work clamp moves to the left so as to form the stitching down one side of the buttonhole slit 1-6 and when said side has been completed the clamping plate is fed in the opposite direction so as to cause the stitching to be formed down the other side of the buttonhole slit. During the stitching on the latter side of the buttonhole and when the parts are in approximately the position shown in Fig. 16 the thread gripper 37 is moved into the position shown in Figs. 7 and 16 and is locked in this position by a suitable spring-pressed latch 47 which engages the tail 48 of the lever 38, said latch being acted upon by a spring 19. The gripper remains in this position until the buttonhole is completed as shown in Fig. 17 and at this time the latch 17 is released thus allowing the spring 50 to return the gripper to the position shown in 17 and during this movement it will engage the needle thread fr between the needle 5 and the cutter and will draw the needle thread into gripping engagement with the spring plate 40. Subsequent to this operation the cutter 32 is given a movement into the position shown in Fig. 17 thereby to cut the thread between the work clamp and the work.

The movement of the thread gripper 37 from the position shown in Fig. 15 to that shown in Fig. 16 is secured by or through the feeding movement of the work clamp, and the release of the thread gripper to permit it to return to the position shown in Fig. 17, and the operation of the cutter are controlled and determined by means associated with the stop mechanism.

rlhe thread gripping arm 38 has a pin or projection 139 rising therefrom which is acted upon by a cam 138 carried by the end of a lever 137 pivoted at 136 to the overhanging arm 3. The upper end of the lever 137 is acted on by a spring 135 which yieldingly holds it in the position shown in Fig. 3 against the stop 1311. The cam 138 has the shape shown in dotted lines Fig. 7 and it normally stands in the path of the projection 139.

lVhen the work clamp is moving in the direction of the arrow in Fig. 15 thereby to stitch down one side of the buttonhole the projection 139 will engage the cam 138 and will swing the lower end of the lever to the right Fig. 3 against the action of the spring 135. On the other hand when the clamp plate 6 is moving in the opposite direction or in the direction shown by the arrow Fig. 16 thereby to form the stitches on the other side of the buttonhole and when the parts arrive at about the relative position shown in Fig. 16, the cam 133 engages the stop 139 and because the lever 137 is prevented from swinging to the left Fig. 3 bythe stop 134i this engagement of the cam with the projection 139 will swing the lever 38 into the position shown in Figs. 7 and 16, that is, it will carry the hook end 37 of said lever across the line of stitching and to the opposite side of the needle thread. 1n Fig. 7 the cam 138 is shown as just passing the projection 139 after having swung the lever 33 to carry the hook 37 across the line of stitching and when said lever has been thus turned the latch 17 will automatically engage the end 48 of the lever thereby retaining said lever in this position after the cam 138 passes the projection 139 and until the latch is released at the end of the buttonhole as will be presently described. In Figs. 15, 16 and 17 the sewing opening through the throat plate and through which the needle reciprocates is shown in dotted lines at 150.

The lever 34. carrying the cutter is pivtally connected at 4:3 to the end of another lever 41 which in turn is pivoted at 42 to the arm 36, the lever 11 being provided with acam face 44.

The latch 17 is also provided with a cam face 51 and these two cam taces are arranged to be acted on by an actuating finger 45. This .linger is mounted on a rod that is slidably carried in a bracket secured to the overhangingarm El and saidv arm 45 depende 'from the rod and is so situated ,that when the sewing on the buttonhole is completed and the clamp plate is in the position shown in Fig. 17 said finger will occupy the dotted line position in Fig. i'.

After the stitchirgT mechanism comes to rest the linger f5 is given a movement to the right Fig. T thereby lirst tripping` the latch 47 to allow the thread gripper to operate and subsequently acting against the cani fil to cause the cutter to operate. l

The actuating` linger fel-5 is ven its movement from the loose pulley 18 a't'ter the belt has been shifted thereto by the following mechanism. The extension 23 ot the bracket arm 2O by whicl the belt shipper is operated has secured thereto an arm on which is pivotally mounted at a latch 56, the latter being acted upon by a spring 57.

58 designates a rock shaft which is journalled in the frame and is journalled at one end in a bracket arm and which has tast thereto an arm which is situated oi the loose pulley 18 and which carries a pin 61 that is adapted to engage in a si'iiral thread 62 formed on a hub et the loose pulley. This arm is normally held in clevated position with the pin 61 above the spiral thread 62 by means ot a spring 61.- which is connected at one end to the 'trame and at the other end to a dependine` arm fast on the rock shaft 58.

66 indicates a stop against which the arm 65v is normally held by the spring` 611. The rock shaft 58 not only can turn in its bearing but can also slide longitudinally thereof: It will be remen'ibercd that attcr the belt has been shifted onto the loose pulley the stop dogy 25 is brought into position to be engaged by thestop cani 24.- and the stop cam rotates the high point 29 thc-rent will swing' the bracket arm upwardly against the action of the spring` 28 inst be'lore the stop dog drops into the valley 80.

Since the arm 54 is carried by the extension 23, said arm 'will also have a rising movement when the stop dog is passino' over the high point 29 of the cam and during' such rising movement the latch 56 will be carried above the arm 60 and will be automatically latched thereto as shown in Fig. 14.

brings the pin 61 into the spiral groove 62.

It will be remembered that the screw thread 62 is rigid with the loose pulley 18 and hence as soon as the belt 16 is thrown onto the loose pulley the screw will be rotated. lVhen the arm 60 is drawn down by the latch 56 thereby to bringsr the pin 6l into mesh with the spiral groove 6:2.` the rotation of the screw 62 will operate through the pin ($1 to move the arm 6() away trom the loose pulley 'o and since 1lhe arm is tast to the shaft 58 it follows that said shaft will be moved in the .lirection of its length and into the dotted position Fig. 5. This movement ot the shallV 58 transmitted to the rod 52 thereby giving` the op erative movement to the actual ingr linger 45. For this purpose the rod 5:2 is lorined with the extension having` the downwardly bent p rtion 68 and the lrackwardly bent portion 69 and this backwardly lient portion carries a projection TO which is adapted to he en raged by a block 71 ilast on the sha'lt 58. Hence the movement oi the shalt 58 given to it by the screw 62. will operate through the parts 70u T1 to move the rod 52 io the right 1, and this movement will canso the actuator 45 to engage the can] taces 51 and All successively thereby eausiufr the gripper l? to grip the needle thread and then the cutter 32 to cut said thread.

The rod is acted on by a spi-ingr lTl. which is confined between the, arm l5 and a portion of the bracket 58. said spi-ingr tending` to return the rod to its normal position shown in Fig. 1.

The construction herein shown is such that when the shaft 58 has been l:rivcii its desired movement by the screw 62 the latch will be automatically disengaged lronl the arm 60 thus allowingf the latter to he returned to its normal position by the spring 6.4i. This spring is so disposed that it not only tends to turn the sl att 58 about it axis but also tends to draw the shatt longitiu dinally toward the frame. and, thcretorc. as soon as the latch 56 is disenfragnal troni the arm 60 the spring' 6l will restore said arin to its normal position.

This automatic rcleaflie results4 troni the swinging); movement of the latch 56 dm` to the movement o'll the arni (it) away lroni the loose pulley 18. .is the screw 62 moves the arm 60 vit will torce the latch 56 backwardly into the dotted line position shown in Fig. 67 and when the latch reaches the inclined position shown the arin d() will automatically slip oli Ytroni the shoulder 73 ot the latch and will be returned to normal position.

The latch is shown as having a stop screw 74 adjustably mounted therein, the adjustment of which will determine the position at which the arm 60 will be automatically disengaged from the latch.

I have also provided herein means for cutting the under thread beneath the work which is actuated by the loose pulley 18.

fr will be held by the thread gripper 37, as indicated in Figs. 1 and 3. lVhen the sewing begins on the next buttonhole this end 162 will still be retained by the thread gripper thus holding the end of the needle thread so that the lirst stitches will be properly formed. The end 162 remains held by the thread gripper while the stitching is being carried down one side of the buttonhole and back along the other side of the buttonhole until the parts arrive at the position shown in Fig. 16 at which time the thread gripper is moved across the line of stitching thereby releasing the thread end 162.

The mechanism herein shown is designed so'that it will cut this thread end 162 before it is released by the gripper so that the thread at both ends of the seam is trimmed close to the wrlr. This second cutting operation is performed by the cutter 32 and results from the feeding movement of the clamp plate in the direction et the arrow Fig. 15 and while the stitching is being formed down the first side ot the bnttonhole slit. When the stitching on the buttonhole begins the arm l5 has approximately the position relative to the cam face 414 shown in Fig. 7 and as the clamp plate G moves toward the left Fig.4 7 or in the direction et' the arrow in Fig. 15 for the purpose of sewing down one side of the buttonhole the cam `tace will engage the arm l5 thereby actuating the cutter and cutting the thread fragment 162 close to the work. rlhe thread-trimming device, therefore, cuts the needle thread at the end of the seam and holds the thread until the neXt stitch is started after which it operates again to cut the end of the needle thread which has been held by the thread gripper thus leaving the buttonhole completely trimmed at both ends of the seam.

While I have illustrated some selected cmbodiments of my invention I do not wish to be limited to the constructional features shown.

I claim:

l. In a sewing machine of the type adapted to sew a short seam and then come to rest, the combination with stitclrforming mechanism including a reciprocating needle, of a stop motion 'lor bringing the machine to rest at the end of the sewingoperation, and means controlled by the stop motion but actuated independently thereof tor cutting the needle thread at the end oit the sewing operation and after the machine has come to rest.

2. In a. two thread sewing machine of the type adapted to sew a short seam and then come to restq the combination with stitch forming mechanism to concatenate an upper and an under thread, of a stop mechanism to bring the machine to rest at the end ot the sewing operation, and means controlled by the stop motion but actuated independently thereof to eut tl e upper and under thread after the machine has come to rest.

3. In a sewing machine ot the type adaptV ed to sew a short seam and then come to resi the combination with stitchtorming meehanism including a needle, ot driving mech* anism ior the machine connlnising :1 driving belt, a tast pulley `from which the machine is operated and a loose pulley, means to shilt the belt from the 'tast tothe loose pulley at the end of the sewing operation, and means actuated by the loose pulley to cut the thread.

4t. In a sewing machine of the type adapted to sew a short seam and then come to rest, the combination with stitch-forming mechanism including a needle, of' driving mecha.- nism for the machine comprising a driving belt, tast pulley trom which the machine is operated and a loose pulley, ineans to shift the belt 'from the fast to the loose pulley at the end of the sewing operation, and means actuated by the loose pulley to cut the thread above the work.

In a sewing machine ot the type adapt ed to sew a short seam and then come to rest, the combination with stitchdiorming mechzw nisin including a needle, of driving mcchanism tor the machine comprising a driving belt, a 'fast pulley from which the machine is operated and a loose pulley, means te shil't the belt from the fast to the loose pulley at the end ot' the sewing operation, and means actuated by the loose pulley to cut the thread beneath the work.

G. In a sewing machine of the type adapt-- edto sew a short seam and then come to rest, the combination with stitch-forming mecha. nism including a. needle for manipulating an upper thread, an under thread nicchanisnry driving mea-ns llor the machine conn prising a driving belt, a iast pulley connected to the operative parts ot the machine and, a loose pulley, means to shift the belt from the fast to the loose pulley at the end oit the sen/ing operation, and means actuated by the loose pulley after the belt is shittcd to cut the upper thread above the work and to hold the cut end.

7. In a sewing machine of the type adapted to sew a short seam and then come to rest, the combination with stitch-forming mechanism inclucing a needle for manipulating an upper thread, an under thread mechanisin, driving means for the machine coinprising a driving belt, a tast pulley connected to the operative paris o I? the machine and a loose pulley, means to shil't the belt Vtroni the Ytast to the loose pulley at the end ot the sewing operation, and means actuated by the loose pulley after the belt is shifted to cut the under thread beneath the work and to hold the cut end.

8. In a sewing machine et the type adapt ed tosew a: short seam and then come te rest,

lll)

the combination with stitch-forming mechanism including a needle for manipulating an upper thread, an under thread mechanism, driving means lor the machine com.- prising a driving belt, a tast pulley connected to the operative parts ot the machine and a loose pulley, means to shift the belt from the fast to the loose pulley at the end of the sewing operation, and ineans actuated by the loose pulley alter the belt is shifted to cut both the upper thread above thev work and the under thread beneath the worlr.

9. ln a sewing machine oi the type adapted to sew a short seam and then come to rest, the combination with stitch-forming mechanism including a needle, of driving mechanism for the machine comprising a driving belt, a tast pulley from which the machine is operated and a loose pulley, means to shift the belt 'from the fast to the loose pulley at the end of the sewing operation, a thread cutter, means to actuate the same by the loose pulley at the end ot the sewing operation to cut the needle thread, means to hold the cut end, andV means Ato actuate the cutter at the beginning of the sewing operation.

l0. In a sewing machine having in combination a work clamp, stitch-orn'iing mechanism, driving mechanism i'or the machine comprising a driving belt, a fast pulley from which the machine is operated, and a loose pulley, means to shift the belt from the fast to the loose pulley at the end of the sewing operation, a thread cutter adapted to cut the thread between the work clamp and the work, means to actuate said cutter from the loose pulley at the end of the sewing operation, means to hold the cut end, and means for operating the thread cutter to cut the thread between the work and the thread holder at the beginning of the seam.

11. In a sewing machine having in combination a work clamp, stitch-forming mechanism, a stop motion to bring the machine to rest at the end of the sewing operation, and means controlled by the stop motion to hold the thread at the. completion of the sewing, a cutter controlled by the stop motion to sever the thread between the work clamp and the work at the completion ot the sewing, and mea-ns for actuating said cutter by the travel oi the work clamp to sever the thread at the beginning of the seam.

12. In a sewing machine, the combinatimi with work-holding means, of stitch-torniing mechanism, a driving elementJ `for operating the stitch-forming mechanism, moans to operatively connect said driving element to or disconnect it from the stitch-forming mechanism, means actuated by the driving element alter it is disconnected from the stitch-forming mechanism to cut the thread.

13. In a sewing machine, the combinay tion with work-holding means, of stitchorming mechanism, a driving element for operating the stitch-forming mechanism, means to operatively connect said driving element to or disconnect it from the stitchforn'iing mechanism, means actuated by the driving element after it is disconnected from the stitch-forming mechanism to cut the thread and to hold the cut end.

14. In a sewingmachine of the type adapted to sew a short seam and then come to rest, the combination with work clamps for clamping the work, which clamps are adapted to be released automatically at the end of the seam, of an auxiliary clamping device, means operative at the end of the seam to retain the auxiliary clamping device in operative position after the work clamps have released the work, means for cutting the-thread subsequent to the release of the work clamps, and means subsequently to release the auxiliary clamp.

15. In a sewing machine having al fast pulley, a loose pulley, a belt for operating said pulleys, and a belt shipper, the combination with said loose pulley, of a worm rigid therewith, a thread cutter, and means actuated by said worm when the belt is shiited from the fast to the loose pulley to actuate the thread cutter.

16. In a sewing machine having a fast pulley, a loose pulley, a belt for operating said pulleys and a belt shipper, the combination with said loose pulley, of a worm rigid therewith, a thread pull-oli, a thread cutter, and means actuated by the worm when the belt is shifted from the fast to the loose pulley to actuate said pull-olf and thread cutter.

17. ln a sewing machine having a fast pulley, a loose pulley, a driving belt and a belt shipper for shifting the belt from the tast to the loose pulley, the combination with said loose pulley, of a worm rigid therewith, a member normally disconnected from the worm, means to operatively connect said member to the worm when the belt is shifted from the `fast to the loose pulley, whereby said member' is actuated by the worm, and a thread cutter actuated by said member.

18. In a sewing machine having a fast pulley, a loose pulley, a driving belt and a belt shipper for shifting the belt from the tast pulley to the loose pulley, the combination with said loose pulley, of a worm rigid therewith, a slidable member, a pin carried thereby and normally held out et engagement with said worm, means to place the pin in operative engagement with the worm when the belt is shifted from the tast to the loose pulley and a thread cutter actuated by said slidable member.

19. In a sewing machine having a fast pulley, a loose pulley, a driving belt and a belt shipper for shifting the belt from the When the belt is shifted from the fast to the fast pulley t0 the loose pulley, the eombinaloose pulley, und a pull-off and thread outtion With said loose pulley, of a. Worm rigid ter actuated by said slid-ble member. 10 therewith, L slidable member, a pin ozured In testimonyv whereof, I have signed my l thereby and normally held out of engagename to this specification.

ment With said Worm, means to place the pin in operative engagement` With the Worm JOHN KIEVVICZ.

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