US2159722A - Stitching machine - Google Patents

Stitching machine Download PDF

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US2159722A
US2159722A US42170A US4217035A US2159722A US 2159722 A US2159722 A US 2159722A US 42170 A US42170 A US 42170A US 4217035 A US4217035 A US 4217035A US 2159722 A US2159722 A US 2159722A
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power
shaft
main
auxiliary source
rotated
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US42170A
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Bedard Joseph William
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Bedard Joseph William
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B69/00Driving-gear; Control devices
    • D05B69/22Devices for stopping drive when sewing tools have reached a predetermined position

Description

May 23, 1939.

J. w. BEDARD I STITCHING MACHINE Filed Sept. 26, 1955 s Sheets-Sheet 1 [NVEiVTOR A TTORNEY 23, 1939- 5 J. w. BEDARD 2,159,722

ST 1120mm momma Filed Sept. 26, 1935 s Sheets-Sheet 5 III II/ INVENTOR v a? g QWMM A TTORNEY J. W. BEDARD STITCHING MACHINE 0w 3 9 l 3 2 w Filed Sept. 26, 1935 6 sheets-shat:

R m N m 2 BY 2 6/244 M QMM JiM ATTORNEY ]May 23, 1939. J, w BEDARD 2,159,722

STITCHING MACHINE Filed Sept. 26, 1955 6 Sheets-Sheet 6 INVENTOR.

BY MW 4M ATTORNEK ima 939 @{Ihis invention relates to means for automati .cally stoppinga rotating shaft,' such as the main particularly to means for automatically stopping [the main drive shaftof such machines at a desired fin al position.

ally necessaryjthatthe last stitch at the end of a Irunbe completed before the work canbe removed turned tostart anew rli' Heretofore, many at temptslhave been made to provide such machines withbraking mechanisms which would stop the fmachine when the last stitch in a run was coml5. plated, but all suchmechanis'mshave been quick actingpwith thefresult that'machines equipped wit-hfisuch mechanisms necessarily had to be run atflow speeds to avoid damage to the delicately .constructedparts. In consequence, the original flg rnethod of hand stoppageisstill practiced to a considerablei extent, this consisting in placing the hand upon the shaft hand wheel, bringing l, the same to astop, and then turning or advancing the wheeluntil the shaft is inthe desired final jposition. H a l In accordance" with the 1 present invention,

means are provided for rotating the shaft at a stop without strain on the delicately constructed imparts "associated therewith when it has been l r'otated to a final desired-position, and tothis end, the shaft is. rotated at the beginning of a :fof power, and then as the end of therun is neared j ,3; ata slower rate of speed by an auxiliary source of l M power, which operates against a braking force ,until the shaft has been rotated to a final del sired position, atwhichtimetheauxiliary source ofl power is automatically rendered inoperative Jand a main brake is rendered operative to bring the shaft to a dead stop in this position.

For a clear understanding of the invention,

\ ,orawings. vention is shown merely in preferred form and by rive shaft of a stitching machine, andmore' of parts;

,In the. operat'on of such machinesitis gener-f from the machine, or before the work can be A high, rate of speed-and for bringing it to a dead run at a'high rate ofspeed bya primary source ..1teference may'be ,made to the accompanying In these drawings, however, the inway of example, but obviously many changes and PATENT OFFICE e STITCHING achine I 1 v Josephjwilliam BedardpfloosickiFallmN. Y.

' Application September 25, 1 935, SerialNo. 42,170

' [12s Claims, (oi.112 +219) vention, and having portions of the top of the bench ortable upon which the machineis mounted broken away to more clearly show the relation Fig. 2 is an end view, partially in section; Figs. 3, 4 and 5 are detail views which show various positions of the means employed in look- ,gagernent and the clutch cones are disengaged;

Fig. 7 is adetail view,in section, showing the inclined teeth on the oppositely disposed ratchet disks partially disengaged and the clutch cones engaged;

V Fig, 8 is a perspective view, partially in section,

of the knee treadle shaft, the knee treadle and the operatingmechanism connected therewith;

Figs. 9 and 10 are diagrammatic views illustrating the various steps of the mechanism shown in Fig. 11 is a rear view, havingportions broken away. to more clearly show the relation of the various parts; v

Figs. 12, 13 and 14 are detailviews, partially in section, showing various positions of the mecha nism'employed in applying a main brake on the main drive shaft and in rendering the auxiliary source of power inoperative; and

Fig. 15 is an enlarged detail view of a portion of the mechanism employed in locking the auxiliary source of power in operative position, in

applying a main brake on the main drive shaft and in rendering the auxiliary source of power inoperative.

As shown, is a bench or table upon which is mounted a stitching machine 2!. As usual, the

machine is equipped with a needle 22, a presser foot 23, and a feedpawl (not shown) which cooperates with the presser foot 23 to advance work under the needle. Thepresserfoot 23, as usual,

is rendered operative or inoperative by a rocker arm "25 pivotally mounted ona stud 26 carried by the main frame of the machine, and the needle 22 Q2! of the machine.

In accordance with the present invention,

means are provided for rotating the main drive shaft 21 at a high rate of speed at the beginning of arun, and in the present embodiment of the invention, this is accomplished by removing the usual main drive shaft hand wheel, and extending the shaft, as by screwing a stud 28 into a tapped opening formed in the end thereof, as shown more clearly in Fig. 6. A face cam disk 29 having an extended bearing bushing 3| is so mounted on the extended shaft as to rotate in unison therewith, and at its outer end the bushing 3| is reduced to provide a seat for a primary power pulley 32, which is fixedly mounted thereon. The primary power pulley 32 is connected by a belt 33 to a primary power drive pulley 34 fixedly mounted on a sleeve member 35 which of power, such as an electric motor (not shown).

The driven member of the clutch 38 is connected by an adjustable rod 38 to afoot treadle 38, which, when elevated, maintains the driving and driven members of the clutch 36 out of engagement, and which, when depressed, maintains the driving and driven members of the clutch in engagement, at which time the primary source of power is rendered operative, and the main drive shaft 21 is rotated thereby at a high rate of speed.

In further accordance with the present invention, means are provided for continuing the rotation of the shaft 21 at a slower rate of speed by an auxiliary source of power after the clutch 38 has been disengaged and the primary source of power rendered inoperative, and to this end an auxiliary power pulley 4| is rotatably mounted on the bearing bushing 3|, and it is connected by a belt 42 to a pulley 43 mounted on a shaft 44 which is positioned parallel to the shaft 31 on which the primary power drive pulley 34 is mounted. A small drive gear 45, mounted on the shaft 31, engages a larger gear 46 mounted on the shaft 44, with the result that the auxiliary power pulley 4| idles about the bearing bushing 3| until the auxiliary source of power is rendered operative. The auxiliary source of power is adapted and arranged to rotate the main drive shaft 21 at a much slower rate of speed than the primary source of power, so that when it is first engaged it, in effect, serves as a brake to slow down the speed of rotation of the shaft 21.

In accordance with the present embodiment of the invention, means are provided for rendering the auxiliary source of power operative in response to the movement of a treadle operable by the knee of the operator, so that the hands of the operator are always left free to guide and manipulate the work under the needle. To this end the auxiliary power pulley 4|, which is rotatably mounted on the bearing bushing 3|, is provided with a driving male clutch cone 41 and the cam disk 39 which rotates in unison with the main drive shaft 21 is provided with a driven female clutch cone 48. Two ratchet disks 53 and 54 are loosely mounted on the bearing bushing 3| between the rotatably mounted auxiliary power pulley 4| and'the primary power pulley 32, which is fixedly mounted on the bearing bushing 3|. ratchet disks are provided with a number of engaging teeth having inclined faces. The outer ratchet disk 54 is maintained stationary at all times by means of a bracket 53 secured at its lower end on a stud 51 carried by the main frame of the machine and at its upper end on the hear- The adjacent faces of these.

ing bushing 3| adjacent the inner face of the primary power pulley 32. The inner ratchet disk 53, however, is secured to an offset lever 58 at the forward end thereof, and a tension spring 8 i tends to rotate the lever and the inner ratchet disk 53 clockwise, as shown in Fig. 1, with the result that the inclined teeth on the ratchet disks 53 and 54 are normally maintained in full engagement, and when this condition obtains a compression spring 49 interposed between the auxiliary power pulley 4| and the cam disk 29 acts to maintain the clutch cones 41, 48 disengaged.

The offset lever 59 at its inner end is provided with a segment 62 having a number of horizontal teeth which are adapted and arranged to engage a pawl 64 pivotally mounted on the side of a main bracket 65 secured to the main frame of the machine, as by a plurality of bolts 86. The pawl 64 is normally maintained in the path traveled by the segment 82 by means of a hairpin spring 81. The offset portion of the lever 59 is' positioned above a roller 88 mounted on a vertically disposed rod 10 at the upper end thereof. The rod 1|], at its central portion, is journaled in a bushing 1| carried by an extension 12 secured to the main bracket 65 and. as

shown more fully in Figs. 3, 4 and 5, it is provided with a stud 13, which normally rests in the bottom of a vertical slot 14 in the bushing 1| to support the roller 68 beneath the offset portion of the lever 59. The lower end of the rod 18 is disposed within a compression spring 15, the upper end of which bears against a collar 16 carried by the rod 10, and the lower end of which rests on recessed plate 11 which, in turn, normally vrests on a bearing bushing 18 positioned in the top of the table ID. The recessed plate 11 is secured to the upper end of a rod 19 journaled in the bearing bushing 18, and the lower end of the rod 19 terminates above a spring pressed latch 80, which is so mounted on the outer end of a rod 8| that it is capable of being folded upwardly when it is subjected to a force applied from beneath, and of being in stantly returned to its normal straight position when the force is released. The rod 8| at its inner end is adjustably secured, to a block 85 which is fixedly mounted on a treadle shaft 86 journaled in bearings 81 secured to the underneathside of the top of the table 8. The treadle shaft 88 is also provided with another block 88 to which the upper end of a connecting rod 89 is secured. At its lower end the connecting rod 89 is adjustably secured to a vertically disposed knee treadle 93 which, when moved to the right against the action of a full spring 94 acts through the above described mechanism in a manner which will subsequently be set forth to force the clutch cones 41, 48 into frictional engagement and so render the auxiliary source of power op erative.

In further accordance with the present invention, means are provided for applying an additional braking action on the main drive shaft 21 while it is being rotated by the auxiliary source of power, and for applying a main brake on the main drive shaft 21 and for automatically rendering the auxiliary source of power inoperative after the shaft 21 has been rotated thereby to a final desired position where, for example, the needle is raised and a stitch is fully completed.

To these ends the face cam disk 29, as shown in Figs. 12 to 14 inclusive, is provided with a cen- .Qtrally 81, having a single high segment 88, and with aconcentric cam segment 03. The distance from the axis of rotation of the face cam disk 28. tothefpeakof the highsegment 60 on gthecentrally cam 91 and to the outer edge of the concentric cam. segment!!! is the same'yandat one end the concentric cam segment .33 is provided with a cam latch IOI, which nor- 5 I finally forms .a continuation from this end of the 1 M 10, 5

the high segment 86 on the centrallydisposed 1 ycam 81. I The cam latch IN is pivotally secured concentric cam segment 38 around to the peak of to the end of theconcentric cam segment 89, and

it is maintained in its normal bridged position by meansof, a hairpin spring 99. The width of the concentric cam segment 33 is such asto provide a eam race I03 which "is adapted. and arranged to receive a stud I06, carried by the upper end-I yof a main rocker arm I06. At its lower end the main rocker armI06is pivotally mounted on the I stud .51 which, as stated heretofore, is carried j by the main frame of the machine, and a tension t spring] I08, andga. leaf spring I06 tend to rotate the rocker arm I06 counter-clockwise, as viewed in the drawings. At one end'the tension spring I08, as shown more clearly in Fig. 2, is connected to the rocker arm I06. and the otherend thereof is secured, as by a wing nut III, to a bracket II2 end thereof is maintained pressed against the carried by the main frame of the machine. At 30 its lowerend the leaf spring I09 is positionedin afslot. cut in the main bracket 65,and the upper rockerarm I06 by an adjusting screw I I4 threaded through a boss us on the main bracket 65. .1 35,

I 1 against the action of the springs I08 and I09,

Normally, the main rocker arm I06 is locked back and, it is so positioned that the outer surface of the concentric cam segment 96, the cam latch and the peak of the high segment 98 pass immediately in front of the stud I05, as the face eam disk 29 rotates during the normal operation of the. mach ne, this being accomplished by a .latchlever 6 which engages a latchiblock Ill carriedby the main rocker arm I06. The latch lever l I6 is pivotally mounted on a stud I I8 car-; ried by the main bracket 65,1and normally it is maintained in its latched position by a, compres-.

sion spring IIO positioned'betweena rear shoulder on the latch and a boss I23 carried by the main bracket 65,, and to limit the rotation of the plied thereto from underneath, and to return 3 X to its latched position when the force is removed.

. n A trip latch I24 is positioned beneath the latch lever II6 for unlocking the same. latch I24'is carried by an L-shaped rocker. arm I25, and it is so secured to one thereof that it 1 is capable of beingfolded upwardly when a force .isapplied from beneath, and of being restored to its normal latched position when the force is removed. The L-shaped rocker arm I25 ispiv- I otally mounted on a stud I26 carried by the main 5 ,bracket 65, and at its other end it is provided with a guide stud I3-I positioned in a vertical slot I32formed in a connecting link I33, this ar- .1 rangement being provided to permit a limited amount of free or lost motion between the end I -;,of the L.-shaped lever I25 and the connecting I link I33; and to adjust or limit the amount of such freeor lost motion of the connecting link This trip 33 is provided with an adjusting screw I34 which protrudes into the slot I32 at the upper end thereof. The connecting link I33, at its lower end, is connected to a rod I35 which extends downwardly through an opening I36 in the top of the table I0, and which is pivotally connected at its lower end to the inner end of a rod I31. At its outer end the rod I3'I is adjustably secured to a block I30 fixedly mounted on the treadle shaft 86 to which the knee treadle 93 is operatively connected. i I n A brake carrying rocker arm I is pivotally mounted on a stud I42 carried by the main rocker arm I06, and at its forward end this brake carry- 0 ing rocker arm is provided with a stud I40 on which a brake shoe I43 is pivotally mounted. The brake shoe I43 is adapted and arranged to frictionally'engage the periphery of the face cam disk 29 when the brake carrying rocker arm I4I is rotated clockwise, as viewed in the drawings. The brake'carrying rocker arm I4I is so mounted on the main rocker arm I06 that the brake shoe I43 is forward of a vertical center line through the axis of rotation of the main'drive shaft 21, and the distance from the pivotal stud I42 to the end of the brake carrying rocker arm I H on which the brake shoe I43 is mountedgis considerably shorter than the distance from the pivotal stud to the rear end thereof so that when a slight downward thrust is exerted on the rear end of the brake carrying rocker arm I, the brake shoe I43 is forced into firm frictional engagement with the periphery of the face ycam disk 29. As shown more clearly in Figs. 1 and 14, the brake carrying rocker arm I4I atitsrear end is provided with an angularly disposed slot I44 within which a stud I45 carried by therear end of a release rocker arm I46 is positioned. The release rocker arm I46 is pivotally mounted on a stud I41 carried by the main bracket 65, and at its forward end it is pivotally secured to a vertically disposed connecting rod I48 at the lower end thereof. The connecting rod I48 at its upper end is pivotally mounted on a trunnion I49 which extends outwardly from a plunger I5I through a vertical slot I 52 formed in one side of a housing I53 which comprises a portion of the main bracket 65. The lower end of the plunger I 5I is-journaled in a vertically disposed cylinder I54 formed within the housing I53. The other sideof the plunger I5I is provided with a trunnion I55 which also extends outwardly through a vertical slot I56 formed in the other side of 5 the housing I53, and this trunnion I55 is positioned beneath the latch 64 which serves to maintain the auxiliary source of power locked in operative position. Normally the plunger I5I is maintained downwardly in the cylinder I54 against the action of a compression spring I5I by means of a parrot lever I58. The parrot lever I58 is pivotally mounted on a stud I59 carried by the main bracket 65 and the beak of the lever is normally'maintained over the top of the plunger I5I by means of a hairpin spring I63. At its lower end the parrotlever I58 is remain bracket 88 as the main rocker arm I88 is rotated clockwise as viewed in Fig. 14.

In operation, and at the beginning of a run, the primary source of power is rendered operative in the manner heretofore described by depressing the foot treadle 39 to rotate the main drive shaft 21 at a high rate of speed. As the end of the run is neared the primary source of power is rendered inoperative by elevating the foot treadle and the machine starts to slow down or coast to a stop. At or about the time the needle 22 starts down to complete the second last stitch, the operator moves the knee treadle 93 to the right against the action of the tension spring 84 thus rotating the treadle shaft 86- counter-clockwise as viewed in Fig. 8, until a member (not shown) on the block 88 engages a stop 95 on the'bearing 81. As the treadle shaft 86 is thus rotated the rods 8| and I3! are rotated accordingly. During the first part of the rotation of the rod 8| thelatch 88 engages the rod 19 and forces it, the compression spring I5 and the rod I8 upwardly as shown in Fig. 9. As the rodIU is thus forced upwardly the roller 68 carried thereby engages the offset portion of the lever 59 and rotates it and the inner ratchet disk 53 counter-clockwise as viewed in Figs. 1 and 3. As the inner ratchet disk 53 is thus rotated the inclined teeth thereon ride upwardly on the inclined teeth on the stationary outer ratchet disk 54 with the result the inner ratchet disk 53 and the auxiliary power pulley 4| are forced along the bearing bushing 3| until the clutch cones 41 and 48 are forced into frictional engagement as shown in Fig. 'l at which time the auxiliary source of power is rendered operative to continue the rotation of the main drive shaft 21 but at a slower rate of speed. As the lever 59 is thus rotated,

the segment 62 is carried upwardly and the pawl 64 in engaging one of the teeth thereon serves to lock the auxiliary source of power in operative osition as shown in Fig. 4. The continued rotation of the rod 8| carries the latch 88 upwardly beyond the end of the rod I9, this being permitted by the yield in the compression spring I5. As the latch 88 thus passes upwardly, the rod 19, the compression spring I5 and the rod I8 drop by gravity to their normal position of rest butthe auxiliary source of power remains locked in its opergtive position by the pawl 64 as shown in Fig.

As the rod I31 rotates in response to the rotation of the treadle shaft 86 the rod I35 and the connecting link I33 are pulled downwardly but the amount of free or lost motion in the link I33 is such that the L-shaped lever I25 remains unaffected, as shown in Fig. 9, until the auxiliary source of power has been locked in operative position. The continued rotation of the rod I31, however, rotates the L-shaped rocker arm I25 about its pivot pin I26 and carries the trip latch I24 upwardly thus releasing the main rocker arm I86 by folding the latch lever II6 upwardly. As the trip latch I24 continues upwardly after releasing the main rocker arm I88, the latch lever H6 is instantly restored to its normal position by the compression spring 9. After the main rocker arm I86 is thus released the knee treadle 93 is permitted to be restored to its normal position by the tension spring 94, and as it returns to its normal position the rods 8| and I3! rotate clockwise as they return to their normal position. As the rod 8| returns to its normal position the latch I9 folds, as shown in Fig. 10, and is carreturns to its normal straight position. As the rod I81 returns to its normal position, the trip latch I24 folds and is carried downwardly beneath the latch lever |I8 where it too is permitted to return to its normal position.

In the present embodiment of the invention. the centrally disposed cam 91 is so positioned on the face cam disk 29 that the peak of the high segment 98 is positioned immediately in front of the stud I81 on the main rocker arm I86 as the shaft 21 starts a cycle of operation to carry the needle 22 down and then up to complete a single stitch, and the length of the concentric cam segment ,98 is such that by the time the main rocker arm I88 is released in response to a movement of the knee treadle 98 at or about the beginning of the second last stitch a portion thereof is in front of the shaft I85 as shown in Fig. 12.

braking action on the cam segment 99 remains unaffected. After the stud I85 has been thus pressed into engagement with the concentric cam segment 99 to apply its braking action on the machine the main rocker arm I86 remains stationary until the peak of the high segment 98 is carried around in front of the stud I85 at the end of a cycle of operation at which time the first stitch is completed. Then as the shaft 21 starts the second cycle of operation to complete the next succeeding stitch the main rocker arm I88 starts to rotate counter-clockwise as the stud I85 is maintained in contact with the centrally disposed cam as shown in Fig. 13. The rotation of the main rocker arm I86 counter-clockwise continues until the rise leading to the peak of the high segment 98 is rotated in front of the stud 85 at which time the main rocker arm I86 is rotated clockwise until the peak of the high segment 98 is again rotated in front of the stud I85 at the end of the second cycle of operation, as shown in Fig. 14. As the rise leading to the peak of the high segment 98 is rotated in front of the stud I85 the cam latch I8I is swung outwardly about its pivotal connection to permit the stud I to pass out of the cam race I83 and after the stud I 85 passes out of the cam race I83 the cam latch I8I is restored to its normal bridged position. During this rotation of the main rocker arm I 86, the stud I45 rides in the slot I44 in the rear end of the brake carrying rocker arm I4I thus preventing the slight spaced relationship between the brake shoe I43 and the periphery of the face cam disk 29 from being disturbed.

When the main rocker arm I86 is rotated counter-clockwise. the outer end of the lever I65 is carried from beneath the shoulder I68 on the bottom of the parrot lever I58 at which time the leaf spring I66 forces the lever I65 upwardly in front of the shoulder I64 as shown in Fig. 13. Then as the main rocker arm I86 is rotated in a clockwise direction as the peak of the high segment 98 is rotated in front of the stud I85 at the end of the second cycle of operation the lever I 65 is carried back." As the lever I85 starts back it first engages the shoulder I84 and rocks the parried downwardly beneath the rod I9 where it rot lever I 58 about its pivotal connection to carry the outer end of"thelever I65 downwardly to its normal posltion beneath the shoulder I84 on the parrot lever-158. Also, as the main rocker arm ot is thus rotated clockwise the latch lever II1 i iscarried back almost to the point whereit would be, engaged bythelatch lever H5. 1 .As the plunger II is thus released it and the trunnions]; I 49and."l55 carried thereby move up 1 wardly under the influence of the compression [As the trunnion; I48 moves upwardly it cartatesfthe rocker armI46 clockwise as viewed in Fig. 15., As the rocker arm I48 isthus rotated i it, inturn, rotates the brake carrying rocker arm t .I4I clockwise andflthus causesthe brake shoe I43 tobecarried into frictional engagementwith the periphery of theface cam 29, and since the distance from the: pivot pin I42 on which the brake carrying" rocker arm I4I to the rear of the arm. is considerably: longer than the distance fromthe pivot pin I42 to the front end of the arm thej brake shoeI I3is forced into firm frictional I v engagement with the periphery of the. face cam g f 29in response toa relatively small force exerted t 80 I43 isfthusengaged the main rocker arm I88 is i carriedback theadditional slight distance necessaryjto permitthe latch IIB engage the block 1 H1 at which time the main rocker arm I88 is so on therear end of the arm. As the brake shoe positioned that the stud m5] is out p of frictional engagement with thecamelements on the face w cam 28; this slight additional movement of the main rocker j arrn I86 being due tothe fact that the face cam 29 in rotating counter-clockwise exertsj a' thrust on the brake shoe I43,which is I mounted forward ofa vertical line through the t axis of rotation of the face cam 29.

. As the trunnionl55 moves upwardly it carries'the pawl 84 out of engagement with the teeth on the segment 82 at which time the offset lever 58and theinner ratchet ,disk 53 are ro- M j tated clockwise by the spring 8| until the inclined I teethf51 on the oppositely disposed faces 01 the ratehetdisks 53and 54 are restored to their normal full engagement. As the inclined teeth 51 [are thus carried injto full engagement the inner H ratchet disks 53finoves outwardly along the bearing bushing 3| and as it so moves the compres- 1 {sion 49. actsto force the auxiliary power pulley 55a I fecting a sparation of the clutchoones 41 and 1 l8 to render the auxiliary source of power In- 3 operative atthe end of the second stitch.-

4| outwardly along thebearlng bushingthus ef- Since thelauxiliary source of power is adapted and arranged to rotate themain drive shaft 21 at al much slowerj rateof speed than the primary source or power it, in efieot, acts as a brake on the main drive shaft when it is first rendered operative.MAlso, since the stud I I05 is pressed 1 into fhrmfrictional engagement with the cam A} elements on the Iface cam 29 when the main 'rockerar'mIIIIi is released, it too acts as a brake onthe main'drive shaft 21 and since power is supplied through. atransmission clutch the speed at whichfthe shait rotates. gradually decreases. Consequently, when the main brake is rendered operative and the auxiliary source of power is rendered inoperativeatthe end of the-second fi titcn, men ionin is brought to rest without a t I a a 2,159,792 the beak of. the parrot lever I58 from above the riesthe rod I48 upwardly with it and thus roany great amount of strain on the delicately constructed parts.

From the above it is obvious that if, when the main rocker arm I08 is released, the stud I85 engages. the centrally disposed cam 81 rather than the concentric cam segment 99 the mechanism will operate to complete but a single stitch. I

Also, it is obvious that by increasing the length of the concentric cam segment 88 and or alterarm 25 is pivotally connected to a connecting rod I1I which extends downwardly through a compression spring I12 and through an opening in the top of the table II]. The compression spring I12 rests on an apertured disk I13 carried by the top of @the table I8, and at is upper end bears against a collar I18 secured. to the connecting rod I1I atthe central portion thereof. The connecting rod "I is connected at its lower end to one end of a chain I which is trained over a pair of pulleys I16 and I11, the pulley I 18 being rotatably mounted on a stud I18 carried by a bracket I18 which is secured to the underneathside of the top of the table I0, and

the pulley I11 being rotatably mounted on a stud I 8| carried by a bracket I82 which is also secured to the underneath side of the top of the table I8. At its other end the chain I15 is secured to a similar chain I83 at the central portion thereof. At its upper end the chain I83 is secured to a rod I84 carried by the plunger I5I and at its lower end it is connected to a rocker arm I85 at the outer end thereof. arm 85 is pivotally mounted on a stud I88 carried by a bracket I81 which extends downwardly from. the rear bearing 11. At its inner end the rocker arm I85-is positioned over a second rocker arm I88 pivotally mounted between its ends on a The rocker stud I89 carried by a. bracket I9I secured to the underneath side of the top of the table III. The

second rocker arm I88 at its other end is pivotally secured to an adjustable rod I92 at the upper end thereof and the rod'at its lower end is connected to a foot treadle I93. 'To reset the mechanism and to render the presser foot 23 inoperative the foot treadle I93 is depressed thus rotatingtherockerarms I88 and I85 counter-clockwise as viewed in Fig. 1. As the rocker arm I85 is thus rotated the plunger I5I is pulled downwardly in the cylinder I54 against theactionof the spring I51 andthe rod "I is pulled downwardly against the action of the compression I 12. As the plunger I5I is pulled downwardly against the action of the compression spring I51, the parrot lever I58 is rotatedabout its pivotal connection by the hairpin spring I63 and the beak of the parrot lever I58 is returnedto its normal position over the top otthe plunger I5I. As the rod I1I is thus pulled downwardly against the action of the compression spring I12 the rocker arm 25 is rotated counter-clockwise as viewed in Fig. 1, and the presser foot 23 is raised to its inoperative position. When the presser foot is released, the compression spring I12 acts to rotate the rocker arm 25 clockwise to restore the presser foot to its down or operative position, and

in so doing a small amount of slack iscreated in that portion of the chain leading from the rod I84, but when the plunger I 5| is again released, this slack is taken up so that the plunger IEI may be again returned to its downward locked position when the foot treadle I93 is again depressed.

It is to be understood that in the present embodiment of this invention, the mechanism employed was so designed that it could be mounted on a standard stitching machine with but few changes in the machine, and so that the machine could be run, when desired, in the ordinary manner. It is obvious, however, that in the event it was desired to stop the rotation of the shaft after the end of every run in accordancewith the principles of the present invention, many changes and improvements could be made which would simplify the operation. For example, the mechanism could be so designed that when the primary source of power was rendered inoperative the auxiliary source of power would automatically be rendered operative. Also mechanism could be employed which, when pressed into action, would automatically release the main brake shoe I43 and the presser foot 23 the instant the rotation of the main drive shaft was stopped. In addition many other changes and modifications would readily suggest themselves to anyone skilled in the art, all of which however, would embody the principles of the present invention.

Having thus described my invention, I claim:

1. In a stitching machine, the combination of a main drive shaft, a primary source of power adapted to rotate the shaft at a high rate of speed, an auxiliary source of power adapted to continue the rotation of the shaft, and means for applying a braking action on said shaft while it is being rotated by the auxiliary source of power to gradually bring it to rest in a final desired position.

2. In a stitching machine, the combination of a main drive shaft, a primary source of power adapted to rotate the shaft at a high rate of speed, an auxiliary source of power adapted to continue the rotation of the shaft, and means for applying a plurality of braking forces on said shaft while it is being rotated by the auxiliary source of power to bring it to rest in a final desired position.

3. In a stitching machine, the combination of a main drive shaft, a primary source of power adapted to rotate the shaft at a high rate of speed, an auxiliarysource of power adapted to continue the rotation of the shaft after the primary source of power has been rendered inoperative, means for gradually decreasing the speed of the shaft while it is being rotated by said auxiliary source of power, and means for rendering said auxiliary source of power inoperative when the shaft has been rotated therebyto a final desired position.

4. In a stitching machine, the combination of a main drive shaft, a primary source of power adapted to rotate the shaft at a high rate of speed, an auxiliary source of power adapted to continue the rotation of the shaft at a slower rate of speed, means for retarding the rotation of the shaft while it is being rotated by the auxiliary source of power, a main brake for said shaft, and means for automatically rendering said auxiliary source of power inoperative and for' rendering said main brake operative to gradually bring the shaft to rest when it has been rotated to a final desired position.

5. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for continuing the rotation of the shaft, a main brake for the shaft, and means for gradually decreasing the speed of said shaft during the rotation thereof by the auxiliary source of power and for rendering the main brake operative and the auxiliary source of power inoperative to gradually bring the shaft to rest when it has been rotated thereby to a final desired position.

6. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for continuing the rotation of the shaft, means for locking said auxiliary source of power in operative position, means for gradually decreasing the speed of the shaft while it is being rotated by the auxiliary source of. power, and means for rendering said auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

7. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for continuing the rotation of the shaft, means for locking the auxiliary source of power in operative position, and means for gradually decreasing the speed of said shaft while it is being rotated by the auxiliary source of power, and for automatically rendering the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

8. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for rotating the shaft, a main brake for the shaft, means for locking the auxiliary source of power in operative position, and means for gradually decreasing the speed of said shaft while it is being rotated by the auxiliary source of power and for automatically rendering the main brake active and the auxiliary source of power inoperative to gradually bring the shaft to rest when it has been rotated thereby to a final desired position.

9. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for continuing the rotation of the shaft, means for gradually decreasing the speed of the shaft while it is being rotated by the auxiliary source of power, and means including a cam element for rendering the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

10. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for continuing the rotation of the shaft, andmeans including a cam element for gradually decreasing the speed of the shaft while it is being rotated bythe auxiliary source of power and for automatically rendering the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

11. In a stitching machine, the combination of a main drive shaft, 9. primary source of power for rotating the shaft at a high rate of speed, an auxiliary source of power for rotating the shaft at a slower rate of speed, a main brake, and means including a cam element for automatically ren- ,1 ofpower inoperative to gradually bring the shaft I desired, position.

12. In astitching machine, the combination of j amain drive shaft, a primary source of power for i to rest when it has been rotated thereby to a jflnal Mrotating the shaft ata high rate of speed, an; auxiliary source of power for rotating the shaft at aslower rate of speed, a main brake, and means including a cam element for gradually decreasing thespeed of theshaft while it ,is being rotated A bythej auxiliary source of power and for auto- Q niatically rendering the main brake active and the auxiliary source of power inoperative to graduallybring the main drive shaft to rest when itlhas beenrotated thereby to a final desired position. 1

1 13. n a stitching machine, the combination of a mainorive shaft, a primary source of power for rotating the shaft at a high rate of speed, an

auxiliary source of power for continuing the rotation of the shaft, means for gradually decreas- ;ing,the,speed of the shaft while it is being rotated by the auxiliary-source of power, a treadle, and

means responsive to the movement of the treadle forautomatically rendering the auxiliary source of powerinoperative when the shaft has been ,rotated thereby to a final desired' position.

14. In a stitching machine, the'combination of ajmain drive shaft, a primary source of power for rotating the shaft at a high rate of speed, an

auxiliary source of power for continuing the rotation of 'theshaft, a treadle, and means respon sivetothemovement of the treadle for gradually decreasingjthe speed of the shaft while it isfbeing rotated by theauxiliary source of power and for }rendering the auxiliary source of power inoperativewhen the shaft has been rotated thereby to a final ,desired position.

.15.;In a stitching machine, the combination of amainy drive shaft, 2. primary source of power for rotating the shaft at a high rate of speed, [an auxiliary source of power for continuing the rotation of the shaft at a slower rate of speed,

means for decreasing the speed of the shaft while it isbeing rotated by the auxiliary source of power, a main brake for the shaft, a treadle, and means responsive to the movement of the treadle forwautomatically rendering the main brake operative and the auxiliary source of power inop- ,erativeitoj gradually bring the shaft to rest when it is rotated thereby to a final desired position.

16. In a stitching machine, the combination of I a mainfdrive shaft, a primary source of power forrotating the shaft at a high rate of speed,

an auxiliary source of power for continuing the rotation of the shaft, a main brake for the shaft,

a treadle, and means responsive to the movement ofthe treadle for gradually decreasing the speed of thejshaft while it is being rotated by the auxiliarysource of power and forautomatically renldering themain brake operative and the auxiliary source of power inoperative to gradually bring *the shaft to rest when' it has been rotated thereby to a finaldesired position.

, 117;, In a stitching machine, the combination of I amain drive shaft, a primary source of power for 'rotatingllthe shaft at a high rate of speed, an

.thewauxiliarysource of power inoperative when x i aiaaraa dering the brake active and the auxiliary source the shaft has been rotated thereby to a final desired position. v

18. In a stitching machine, the combination of a main drive shaft, a primary source of power, an auxiliary source of power, a plurality of treadles, means responsive to a movement of one of saidtreadles for rendering said primary source of power operativeto rotate said shaft at a high rate of speed, and means responsive to a movement of another of said treadles for rendering the auxiliary source of power operative to conj a main drive shaft, a primarysource of power,

an auxiliary sourceof power, a pluralityof treadles, means responsive to a movement of one of said treadles for rendering the primary source of power operative to rotate the shaft at a high rate of speed, and means responsive to the movement of another of said treadles for locking the auxiliary source of power in operative position to continue the rotation of the shaft ata slowerrate a main drive shaft, a primary, source of power,

an auxiliary source of power, a plurality of treadles, means responsive to a movement of one of saidtreadles for rendering the primary source of power operative to rotate the shaft at a high rate of speed and means responsive to the movement of another of said treadles for locking the auxiliary source of power in operative position to continue the rotation of the shaft at a slower rate of speed and for rendering active mechanism which applies a braking action onthe shaft and which renders the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

21. In a stitching machine, the combination of a main drive shaft, a primary source of power, an auxiliary source of power, a main brake for the shaft, a plurality of treadles, means responsive to a movement of one of said treadles for rendering the primary source of power operative to rotate the shaft at a high rate of speed and means responsive to a movement of another of said treadles for rendering the auxiliary source of power operative to continue the rotation of the shaft at a slower rate of speed and for rendering active mechanism which automatically renders the main brake operative and the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

22. In a stitching machine, the combination of a main drive shaft, a primary source of power, an auxiliary source of power, a, main brake for the shaft, a plurality of treadles, means responsive to a movement of one of said treadles for rendering the primary source of power operative to rotate the shaft at a high rate of speed, means responsive to a movement of another of said treadles for rendering the auxiliary source of power operative to continue the rotation of the shaft at a slower rate of speed and for rendering active mechanism which applies a braking action on the shaft and which automatically renders the main brake operative and the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position, and means responsive to a movement of still another treadle for releasing said main brake.

23. In a stitching machine, the combination of a main drive shaft, a primary source of power,

an auxiliary source of power, a main brake for the shaft, a presser foot, a plurality of treadles,

means responsive to a movement of one of said treadles for rendering the primary source of power operative to rotate the shaft at a high rate of speed, means responsive to a movement of another of said treadles for rendering the auxiliary source of power operative to continue the rotation of the shaft at a slower rate of speed and for rendering active mechanism which applies a braking action on the shaft and which automatically renders the main brake operative and the auxiliary source of power inoperative when theshaft has been rotated thereby to a final desired position, and means responsive to a movement of still another treadle for releasing themain brake and for rendering the presser foot inoperative.

24. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft,means for rendering the primary source of power operative for a desired interval and for thereafter rendering it inoperative, an auxiliary source of power for continuing the rotation of the shaft, means for rendering the auxiliary source of power operative any time after said primary source of power is rendered inoperative, and means for gradually decreasing the speed of the shaft while it is being rotated by the auxiliary source of power and for rendering the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

25. In a stitching machine, the combination of a main drive shaft, a primary source of power for rotating the shaft, means for rendering said primary source of power operative for a desired interval and forthereafter rendering it inoperative, an auxiliary source of power for continuing the rotation of the shaft, means for rendering said auxiliary source of power operative any time after said primary source of power has been rendered inoperative, a brake for the shaft, and means for gradually decreasing thev speed of the shaft while it is being rotated by the auxiliary source of power, for rendering the brake operative and for rendering the auxiliary source of power inoperative when the shaft has been rotated thereby to a final desired position.

26. In a stitching machine, the combination of a primary source of power adapted to rotate the shaft at a high rate of speed, an auxiliary source of power, means for rendering the auxiliary source of power operative to automatically complete a predetermined number of machine cycles of operation after the primary source of power has been rendered inoperative, and means operable during said predetermined number of machine cycles of operation to gradually bring the shaft to rest in a desired position.

J. WILLIAM BEDARD.

US42170A 1935-09-26 1935-09-26 Stitching machine Expired - Lifetime US2159722A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747715A (en) * 1950-02-17 1956-05-29 Louis Johannes Mario Reher Stopping mechanism for sewing and other machines
US2883869A (en) * 1956-04-24 1959-04-28 Pfaff Ag G M Embroidery transmission mechanism for sewing machines
DE1129810B (en) * 1959-05-11 1962-05-17 Necchi Spa Speed ​​changing device for Sewing machines
US3585949A (en) * 1969-02-27 1971-06-22 Joseph Chudner Device for stopping a working element in a given position
US3636901A (en) * 1969-10-29 1972-01-25 Sewprima Ltd Needle-positioning attachment for a sewing machine
US4515098A (en) * 1981-08-25 1985-05-07 Pfaff Industriemaschinen Gmbh Device for driving a sewing machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747715A (en) * 1950-02-17 1956-05-29 Louis Johannes Mario Reher Stopping mechanism for sewing and other machines
US2883869A (en) * 1956-04-24 1959-04-28 Pfaff Ag G M Embroidery transmission mechanism for sewing machines
DE1129810B (en) * 1959-05-11 1962-05-17 Necchi Spa Speed ​​changing device for Sewing machines
US3585949A (en) * 1969-02-27 1971-06-22 Joseph Chudner Device for stopping a working element in a given position
US3636901A (en) * 1969-10-29 1972-01-25 Sewprima Ltd Needle-positioning attachment for a sewing machine
US4515098A (en) * 1981-08-25 1985-05-07 Pfaff Industriemaschinen Gmbh Device for driving a sewing machine

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