US1677673A - Stop mechanism for sewing machines - Google Patents

Description

July 17, 1928. 1,677,673

I R. A. GRAMQE STOP MECHANISM FOR SEWING MACHINES Original med Aug. 11. 1924 2 Sheds- Sheet 1 INVENTOR. 12/1 'mmw,

A. ATTORNEYS Julyl7, 192s. 1,677,673

R. A. GRAMSE s'roP MEGHANISKFOR snwme MACHINES Original Filed Aug.11. 1924 2 Sheets-Sheet 2 I N VEN TOR. 1Z1 mzrmq,

J6 ATTORNEYS Patented July 17, 1928.

u i-TEnsrATEs PATENTJQFFICE.

may a GRAMSE, or rannoan,

,- .CHINERYQQ,

Gonti nuationyot application eria1 No.

' Myinvention relates to improvements 1nv stop mechanism for sewing machines. the present embodiment of the invention be ng particularly designed and adaptedfor' use in connection with that class or'type of sewing machines commonly known as dial A further and very important object is the provision of an improved stop motion at tachment which may bereadilyattarihedto or detached from the ordinary or conventional form of dial looper without inany way interfering with the normal operation of the latter, including in particular improved'clutch shifter mechanism cont-rolled by the thread for shifting the clutch shift mechanism to an open or stopped position.

A further object of the inventioiris to provide a control for the clutch shiftcrmechanism which will be normally maintained in inoperative position but which will be rendered operative to shift the clutch shifter mechanism to an open orstopped'pos'ition either upon breakage or depletion of the thread or upon the occurrence of a knot in the thread. 1

1 A still further and important object is the provision of an improved knot catcher arranged in co-operative relation to the thread tension and sewing mechanism, said knot catcher being provided withan improved form and arrangement of thread intercepting and deflecting means adapted upon the occurrence of a knot to intercept and move the thread to one side, thereby releasing the thread control'or trip mechanism to positively move the stop mechanism to release the inachinedriving parts.- 9 v v With the above mentioned and other ends in view, theinvention consists in the novel KENTUCKY, nssieiioa'ro sonrnn m TEXTILE MA- on rAnUoAn, KENTUCKY, A CORPORATION or KENTUCKY.

scuorf MECHANISM r03 s'EwIiIG MACHINES.

781,295, fi1ed August 11, 1924. This-application flledJ'une 20,. 1927. Serial No. 199,967.

construction, arrangement and combination of parts, herelna-ft'er described, illustrated in one of its embodiments in 'the accompany ing drawings, and particularly pointed out in the appended cla ms. i

Referring to the j drawings, forming a part .of thisspecification,

Figure 1 is a top planview of a sewing machine of the dial looper type, equipped with stop mech'anismconstructed in accord ance wit-h'this invention, the old or conventional machine part-s beingshownin dotted lines, I

. Fig. 2, a top plan view of th'e thread and cam controlled shiftable link adapted in one postion to clear the driving and clutch shifte ing mechanism and in another to connect therewith and shift the clutch shifting mech I anism to an-op'en position.

Fig. 3, an end elevation of said thread and cam controlled shifter link, detached, as in Fig. 2.

Fig. 4,]a top plan view of a dial looper I equipped with the improved stop mechanlsm and showing the parts in their connected fully shifted clutch released position, "as upon the occurrence of a knotted or broken thread. i

I Fig. 5, an enlarged side elevation of the improved oscillatory knot catcher andthread guide and shift mechanism in association with the conventionalthreadcatcher mechanism, and in normal sewing or. untripped.

position. 1

Fig. 6, a front elevation of thesame.

Similar numerals of reference designate drawings.

Y In Figs. land dot the drawings, I have shown my improvements applied to a sewing machine of the dial looper type embodying the usual bed plate 1, together with the usual overhanging dial supporting arm' like parts throughout all the figures of the relatively circnmferentially fixed and movable clutch members 4; and 5, respectively on the end of the driving shaft 3, the longitudinally movable circumferentially fixed clutch 1 being adapted to be moved or shifted by means of a slide or shift member 4, operating in a sleeve or guard member 6, and provided. with spaced bearing members 1 adaptedto be positively 'moved to and from the respective engaged and disengaged positions by means of an interposed cam 7, horizontally movable on a suitable bearing, the cam 7 being provided with an actuating arm or lever 7 The clutch shifter mechanism includes a longitudinally movable clutch shifter 8, consisting, in the present instance, of a shifter rod extending forwardly and parallel with the overhanging arm 2 and supported in a suitable guide bracket 9.

As a means of positively actuating the clutch shifter mechanism, when the stop mechanism hereinafter referred to is brought into action, the driving shaft 3 is provided at one side with a drive -wheel 10 which, in the present instance, is in the specific form of a rotary channel shaped memher having a driving'pin or projection 10.

The clutch shifter member or rod 8 is also provided with a sleeve or projection 8, having a stud member 8 to be engaged by the thread controlled link of the stop mechanism when said link is engaged by the abutment or projection 10, as hereinafter referred to.

As a means of providing a link device adapted in one position to clear the said driving and clutch mechanism and in another to connect therewith and shift said clutch mechanism to open the clutch and stop the drivingmechanism and the various devices connected therewith, a longitudinally and transversely movable link 11, is provided, the body of said link, in the present instance, being in the specific form of a rod or shaft 11 carried in suitable bearings 12, of a supporting and attaching plate 12. The plate 12, in the present instance, is attached to the top of the overhanging arm 2 by means of attaching elements or screws 12 The rod or link 11 is loosely mounted in the bearings 12 so that it may be readily moved longitudinally, as well as rocked or tilted through the control arms or levers nowdescribed. The relatively movable or pivotable link 11 is provided at one end with a depending arm or lever 11 (seeFig. 3) and at the other end with a horizontally extending arm or lever 11", the latter extending above the clutch shifter 8 and in suitable proximity to the sleeve 8 and projection 8 to engage the latter when tilted by the thread controlled trip mechanism, hereinafter referred to.

As a means of holding the link 11 with its arms 11 and 11 in a neutral position mechanism is provided consisting, in the presentinstance, of a cam member 13, pivotally mounted at one side of the attaching plate and arranged to engage beneath the arm 11 and in the normal position adapted to sustain the arm 11 with the arm 11 in a neutral position (see Fig. 1) and in another position to be engaged by the projection 10 and to engage and shift the.clutch shifter 8, as shown in Fig. 4 of the drawings. The cam 13 may be of any suitable form and, in the present instance, is formed as an off-set portion of a. shaft *1331mounted in bearings 12, of the plate 12, said cam or shaft being provided with a'horizontally extending arm 13", having its free. end normally sustained by the thread 14, after passing through the tension device or disc'15,;arranged on the disc stud 16. The thread tension device may be of the usual construction, as shown, and mounted on the usual tension post or pedestal 17. passing through the tension, disc 15 and through an opening or eye 18*- of a post or stud 18 is led from the tension disc 15 over a thread guide 19, after which it is passed down to the sewing mechanism and by being so arranged a horizontally extending taut portion 14* is maintainedbetween the thread tension and thread guide mechanism for conveniently supporting the thread controlled arm 13;

As a means of causing the trip arm 13 to drop and thereby bring the stop mechanism into use when a knot or enlarged or obstructing portion occurs in the. thread, a thread controlled knot catcher and trip device is provided, said. device, in the present instance, comprising an oscillatory member 20, carried in a pivoted block 21, loosely mounted on the stud shaft 16, the member 20 being provided at one end with a knot catcher consisting, in the present instance, of a loop head 20 having a vertical slot 20 to readily receive the thread 14 As a means of engaging and deflecting the taut thread portion l4: away from vthe thread sustained triparm 13 in the eventthat, a knot comes into engagement with the knot catcher and as the latter swings downwardly, the thread controlled or actuated member 20 is provided at one end'and near the arm 13 with an arm or upwardly and outwardly inclined thread intercepting and moving clement 20, which upon moving upwardly will deflect the thread, thus clearing the end of the trip arm 13 and allowingthelatter to drop. Should a break in the-thread occur, the loosencss in the thread in proximity to the trip arm 13 will obviously allow the latter to drop and function,-as above described, likewise upon depletion of the The thread 14: after thread the trip arm -13 *Will permitted to drop and thus render thestop mechanism operative. T e

iis is a continuation of application Serial No; 731,295, filed August 11, 1924.

I claim 1. In combination with" the drive and drive control mechanism of a sewing machine, of stop motion mechanism including a thread control knot catcher and trip de-' vice, said trip device being operable by said knot catcher and upon 'depletion of the threadg said trip device being normally supported by thethread and movable to operative position lay-gravity.

2. In combination with drive control mechanism of a sewing machine, of a stop motion mechanism includlng a normally inoperative trip device, said trip device being rendered operable by the presence of a knot in the-thread and upon breakage" or depletion of said threadsaid trip device being normally supported the thread and movable to operative position by ravity.

said shaft, and a stop motion mechanism for rendering said clutch inoperative, said stop motion comprising a shifter mechanism connected to "said clntch, a driving mechanism operable by said shaft, andthread ei'igaging means'operable by disen-v gageinent of the thread therefrom for connecting said driving and clutch shifter mechanisms, and means for deflecting the thread and moving it ontof engagement with the last mentioned means.

In a sewing machine, the combination of a driving shaft, a clutch mechanism on saiashaft, and a stop-rnotion mechanism for rendering said clutch inoperative, said stop mot-ion comprising a shifter" mechanism conne'cted to sa d clii-tch, a driving mechanism connected from the shifter mechanismfa' connecting member for connecting said driv ing and clutch thread engaging; trip, said connecting mem ber beingnormally maintained in position bysaid trip to render the clutch "shifter in-- operable, said trip being rendered operable drive control mechanism 'of' of stop motion mechanism including the drive and p v a sewing machine, the combination of a driving shaft,'a' clutch mechanism-on shifter mechanisms, and a y therefrom, whereby said connecting member may be actuated to render the 'stopmech: anism operative,

6. In combination chine, a thread controlled knot catcher and trip device, said trip device having an? element supported in inoperative posltion by the thread. a k a v j 7 In a looping machine, including driving vand driving shifter mechanism, driving shifter means controlling rendering saidmeansoperable during an u nil-lte'i' rupted feed of threadto the machine, said'trip bei controlled by the position of the thread re atively to 'an'element thereof to support the; latter in neutral or inoperative position, "and means for moving the thread relativelyto the tripelement upon 00 currence of a'knot in said thread. 7

8. In combination with the drive and drive control mechanism, of a looping machine, including thread tension mechz'ainisirrv of stop motion mechanism 1ncludtherefor, in a thread control device for controlling said drive control -m'echa'nism, said thread control device embodying an element nordeflection ofthe thread told'isengageit- 'and means for deflecting. the thread from'said trip upon-occurrence of akn'otin the thread. a

with the drive and!- a sewing ma said driving" shifter mech'an1sm,'and a trip mechanism for mally supported in neutral position-by the 1 thread, and means -engage'able by a knotin' the thread for deflecting the said threadand' moving it f-rom'the position in which it nor lnally supports :said element. v

9; In a looping machineincluding driving and clutch shifter and thread tension mechanisms, connections between said. driv:- ing and clutch shifter mechanisms, and "a trip normally operative o'sition by engagement with-the thread" an adapted to render said connections operable upon-depletion or breakageof the thread as well as upon movement of the thread relatively thereto.

10. -In a device of the character described,

in combination Jwith the thread tension mechanism of a sewing-machine and the driving mechanism therefor, :a trip mechanism having an element "normally suported-in inoperative position the thread,

and amo'vable knot catcher having an arm: adaptedgto intercept and move the thread to 'one side of said trip element when aknot occurs therein,'-whereby said trip will 'be renderedo erable. Y

11. In combination with a sewing machine including driving and clutch shifter mechanism, a link, loo'sely and lpivoj'tally mounted between said driving and clutch shifter mechanism, a taut threadsustained maintaining said connections inoperatlve, said trip being controlled by the tension oflthe threadand maintained in in and controlled device by which said link is held in a neutral position, said thread sustained and controlled device being movable upon breakage or deflection of the taut thread to permitsaid link to move into engagement with said driving. and clutch shifter mechanisms to thereby disconnect the driving mechanism, and means operable by a knot in the thread for likewise permitting a movement of the thread sustained and controlled device whereby said link will also be permitted to move into engagement with said driving and clutch shifter mechanism,

12. In a machine of the character described, in combination with the driving and thread tension and clutch shifter mechanisms of a sewing machine, a link interposed between said driving and clutch shifter mechanisms, means sustained by the thread for holding said link in a neutral position, said link being free to move to its operative position into engagement with said driving and clutch shifter mechanisms upon depletion or breakage of the thread, and means operable by a knot in the thread to deflect or movesaid thread with respect to thethread sustained means and render said link free to move to its operative position. i I

13. In a stop motion device for'sewing machines, in combination with the driving and clutch shifter mechanisms thereof, a

link normally positioned to clear said driving and clutch shifter mechanisms, said link being movable to connect with said driving and clutch shifter mechanisms, a trip by which said link is maintained in its neutral position, said trip being normally sustained by the thread whereby said trip will be operated and the link moved from its neutral position upon breakage or depletion of the thread, and a knot catcher having a thread intercepting and deflecting element adapted upon occurrence of a knot in the thread to deflect said thread from its normal trip sustaining position and thereby permit movement of the link from its neutral position.

14. In a structure of the character described, a driving shaft provided with a clutch member, a clutch shifter, a wheel on said shaft for actuating said clutch shifter, a pivoted link having arms normally positioned to clear said wheel and clutch shifter,

said link andthe arms thereof being movable to be engaged by said wheel and clutch shifter to actuate the latter, means for maintaining said link in its neutral position from a taut thread leading to the sewing machine, and a pivoted thread guide including a knot catcher adapted to'be actuated by a thread knot to shift said means for maintaining the link in its neutral position and permitting said link to move from its neutral position to an operable or clutch shifter position,

thereby effecting a stoppage of the driving adapted to move thesame and permit said thread supported member to release said link and allow the latter to assume a position to engage said projection and clutch shifter. t

16. In a device of the character described,

a driving shaft having a projection, clutch driving mechanism on said shaft, a thread tensioning mechanism including a movable knot catcher and thread deflector,"a clutch shifter, a link movable into and out of engagement with said projection and clutch shifter, a link supporting member and a triparm connected to said link supporting member and normally supported on the tension thread for maintaining said member and the link in position to prevent engagement of the link with the projection and clutch shifter, whereby deflection of the thread by the knot catcher and thread deflector or breakage or depletion of said thread will result in the removal of the supporting thread for the trip arm and permit the link supporting member and link to assume positions whereby the link will engage the projection and clutchshifter.

17 In a device of the, character described,

in combination with the driving shaft of a sewing machine includinga clutch driv- 1ng mechanism, and a thread tension device, an oscillatory thread guide and knot.

catcher, means for shifting said mechanism, a thread supported trip-member associated with said thread tension device and thread guide and knot catcher, and means for engaging and rendering said clutch shifter operable, said means being held in neutral position by said thread supported trip member, and said means being movable into connected relation withsaid driving shaft and said clutch shifter to throw the driving shaft and its connections out of, operation-upon movement of the thread, supported tripmember, said trip members being free to move upon breakage or depletion of the thread or upon oscillation of said thread guide and knot-catcher. v

18. In a device of the character described, a driving shaft having a projection, clutch driving mechanism onv said shaft, thread tension mechanism including an oscillatory,

thread guide and knot catcher adapted to deflect the thread upon occurrence of a knot therein, a clutch shifter, a cam member havv ing an arm normally supported on the thread carried by said thread guide and tension mechanism, and a pivoted movable link interposed between said driving shaft, projection and clutch shifter, said link being held by said cam member in neutral position when said. member is in its normally 10 thread supported position and said link being movable to connect said projection and clutch shifter when said thread supported cam member is freed by breakage or depletion of the thread by said knot catcher.

ROY A. GBAMSE.

the thread or by deflection of 1

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