US1905854A - Buttonhole sewing machine - Google Patents

Description

April 25, 1933. c. A. o. GRIP 5 35 BUTTQNHOLE? SEWING MACHINE Filed May 24, 1932 3 Sheets-Sheet 1 Fig.1.

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April 25, 1933.

C. A. O. GRIP BUTTONHOLE SEWING MACHINE Filed May 24, 1932 Fig.2.

3 Sheets-Sheet 2 732 Fig.3.

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BUTTONHOLE SEWING MACHINE April 25, 1933. Q O GRlP 1,905,854

Filed May 24, 1932 3 Sheets-Sheet 3 67 I Inv e nTor. Cori A.Q.Gr\p

Patented Apr. 25, 1933 UNITED STATES PATENT pnea-i,

CARL a o. GRIP, or NEWTONVILLE, MASSACHUSETTS, ASSIGNOR "To; 'REEC'E BUTTON HOLE MACHINE COMIANY, F BOSTON, MASSACHUSETTS, CORIfOR-A- TION OF MAINE BUTTONHOLE SEWING MACHINE Application filed May 24, 1932. Serial No. 613,217.

This invention relates to buttonhole sewing machines and has for one of its objects to provide'a novel means for pulling off a length of under thread at the GIICl'Of the sewing operation preparatory to cutting the under thread and stay cord. I

Another objectof the invention is to provide improved means for guiding the reciprocating movements of the under thread mechanism which is mounted on the turret.

In order to give an understanding of the invention I have illustrated in the drawings a selected embodiment thereof which Wlll now be described after which the novel features will be pointed out in the appended claims.

Fig. 1 is a side view of a portion of abuttonhole sewing machine embodying the invention;

Figs. 2 and'3 are views of the turret and the under thread mechanism carried thereby;

Fig. 4 is a fragmentary sectional view showing the operation of the under thread pull-off Fig. 5 is a sectional view of the under thread pull-off arm taken on substantially the line 7-7, Fig. 3; h

' Fig. 6 is a section on the line 8 8, Fig. 5;

Fig. 7 is a section on the line 11, Fig. 2 looking upwardly in said figure;

Fig. 8 is a fragmentary view illustrating the operation of the under thread pull-off arm;

Fig. 9 is a fragmentary view showing a slightly different'way of mounting the pullolf arm than that shown in Figs. 5 and 6;

F ig..10 is a section on the-line 1010, Fig. 9 but illustrating the pull-off arm in eleva,- tion.

The buttonhole sewing machine herein illustrated has theusuaI work-holding means which is mounted on the bed plate 1 and the usual stitch-forming mechanism which is carried by a stitch frame indicated generally at 2. The stitch frame and the bed plate have a movement relativeto each other during the sewing on the buttonhole andalso a further relative movement to'carry the parts from stitching. to buttonhole cutting position as usual in buttonhole'sewing' machines of this type;

' jThe work-holding clamps 3 by which the, work 4 is'clamp'ed against the mats5 I which arecarried by the clamp plates "6, the latter being removably mounted on the bedplate'las usual.

The "stitch-forming mechanism comprises 'the usual needle 7 carried by a needle bar 8 which is mounted for "reciprocation in the stitch frame 2, and also under threadmecha- 'nism which is carried by the turret-9 that is rotatively mounted in the portion 10 of the stitch frame on the opposite side of the work from the needle.

Theturret 9 carries the usual throat plate or'butt0n 11 which is provided: "with the sewing op'ening 12 through which the' needle TOperates. 'fl

The under thread mechanism is of the type which comprises the loopers l3 and the loop spreaders 14, said loopers and spreaders being carried on the oscillatinglooper-carrying block 15 which is mounted to oscillate upon a stud 16. The means for oscillating the looper-carrying block 15 issimilar to that usually employed in buttonhole sewing machines of thistype'f Said block isconnected by a link 17 to a hollow spindle 18"wliich reciprocates vertically in the turret 9. 'Said spindle is actuated by a lever 19 pivoted-to the portion 1'0 of the frame at 20 and-connected by a link 21 to" a suitably actuated lever which gives the lever 19- its required oscillating movement. 1

The loop Spreaders are actuated as usual by means'of a spreader wedge indicated at 22 whichisgalso mounted for oscillation on thetstud 16 and is connected by a link 23 to aspindle 24 which extends axially through the spindle 18'and which is actuatedbya lever'25 pivoted at 26 to'theportion 10 of the stitch frame, said lever being connected by-a link 27 to a suitably actuated lever. It will be "understood by those familiar with buttonhole sewing machines that; during the sewing of the buttonhole, the stitch frame 2. andthe'work-holding means will have arelative feeding movement and when the sewing 011 the means comprises work buttonhole has been com- 7 pleted and the stitch-forming mechanism has come to rest with the needle retracted as shown in Fig. 1, said stitch frame and workholding means will have a further relative movement to carry the parts from stitching to buttonhole-cutting position, the buttonhole-cutting position being indicated by the dotted lines in Fig. 1. During this further movement the under thread 28 Which-is led to the work from the threaded looper through the sewing opening 12 of the throat plate 11, and the stay cord 29 which is also led to the work through the sewing opening 12, will be drawn out through the sewing opening as illustrated in Fig. 4 so that there will be a length of the thread and the stay cord extending from the stitched buttonhole 30 to the throat plate 11 and lying on the opposite side of the work from the needle.

One feature of the invention relates to a novel pull-0E device for acting on the length of under thread between the throat plate and the work to pull off a length of under thread from the source of supply sufiicient to enable the first stitch on the next buttonhole to be properlyformed.

The underthread pull-oif is in some respects similar to that shown in co-pending application of Joseph Pikul, Serial No. 525,376, filed March 26, 1931. 'Asillustrated in Figs. 4 and 5 it is mounted on the turret and comprises a pull-off arm 3lpivotally mounted on the stud 16 and provided at its upper end with a pull-off hook 32 adapted during the operative swinging movement of the arm 31 toward the left in Fig. 3 to engage the under thread 28 between the throat plate 11 and the work and thereby pull a ength of under thread through the throat plate from the source of supply, it being understood that the tension on the under thread will be released at thistime by mechanism usually employed for that purpose thereby toallow the under thread to be freely drawn from thesource of supply. The amount of under thread which is thus pulled through the throatplate is sufiicient so that when the under thread has been cut close to the work byany suitable thread-cutting device there will be pro ecting from thethroat plate a sufficient length of under thread properly to form the first stitch on the next buttonhole.

This pull-off arm 31 is normally held in its inoperative position by a spring 85 which isconnected at one end to said arm and at the ,other end to an anchorage 96 carried by the turret 9. Said pull-off arm 31 is shown in Figs. 5 and 6 as provided at its lower end with'a split hub 33 which encircles and is clamped to, a sleeve 34 that is mounted for turning movement on an extension .35 of the stud 16. The split hub 33 is clamped to the sleeve 34 by means of a clamping screw 36. The sleeve 34 is provided with a slot 37 in whichis received. a stop pin 38 carried by the stud extension 35, said stop pin and slot limiting the extent of the spring-impelled return turning movement of the sleeve about the stud and consequently stopping the arm 31 in its proper inoperative position.

The throat plate 11 herein illustrated is constructed similar to that shown in the machine illustrated in the above-mentioned copending application Serial No. 525,376, in that it has a slot 39 into which the under thread 28 is received when the parts have been moved into buttonhole-cutting position as shown in Fig. 4 the cord 29 at such time resting on top of the throat plate and thus being above theportion of the under thread which extends from the throat plate to the work. hen the pull-off arm is given its operative movement from the full to the dotted line position Fig. 8 the hook 32 engages the under thread 28 but does not engage the cord 29 sothat the pull-off, arm acts only on the under thread. 4 y v The. pal-off arm is given its operative movement by the reverse rotative movement of the turret 9 which occurs after the sewing of the buttonhole has been completed. Those who are familiar with button hole sewing machines will understand that in sewing around the eye end of the buttonhole the turret will have a half rotation and thatafter the sewing on the buttonhole has been completed and the stitch-forming mechanism has come to restand either during or directly after the movement by which the stitch frame and work-holding means are carried into buttonhole-cutting position the turret will be given a reverse rotative movement to bring it back into initial position ready for the stitching on the next buttonhole.

The pull-0E arm 31 is of the type which is actuated by this reverse rotative 1nove inent. For this purpose the hub 33 of said pull-off arm has adjustably mounted thereon a depending tail 40 which extends down through the upper ring 41 of the turret and is adapted to engage a dog 42 carried on the under side of thebearing portion 43 of the stitch frame in which the turret is mounted. This dog is shown as pivotally mounted on a stud 44 carried by the portion 43 of the stitch frame and is acted on by a spring 45 which normally holds it in its operative position shown in Fig. 7 in which it rests against a stop'pin 46. When in this position the end 47 thereof is in the path of movement of the laterally-bentend 48 of the tail 40. At the time that the stitch-forming mechanism comes to rest the turret will be so positioned .in'its bearing that the laterally-extending end 48 of the tail'40 will be in close proximity to the end 47 of the dog 42. and as the turret is given its reverse rotative movement in the direction of the arrow in Fig. 7 the end 48 of the tail 40 will strike the end 47 of the dog .42 so that during the further rotative movement causingthe pull-off hook 32'ito engage the under thread and pull a'sufiic-ient length there- 5 of fromthe source of-supply through the "throat plate.- r 1 As the turret continues its rotative movement the end 48 of the tail 40 will wipe over 'the end 47 of the dog 42 'and'the spring 85 will then return the pull-off arm toits normal position, which position is determined'by the engagement of the pin 38--with-one end of the slot 37 as previously mentioned One feature of the present invention relates to means by which the amount of thread which is pulled off ma'ybeadjusted according to the requirement of use; This isaccomplished-by providing means whereby the tail 40 may be adjusted vertically with relation to the liub 33. As shown in F ig; 6 the tail 40 is ma de separately from the hub 33, the latter having a flat face 49 to whichtheupper end of the tail 40'is adj ustablysecured; Said upper end is shown as having a slot 50 therein through which the clamping screw 36 extends, said screw performing the double 1 function-f of clamping the hub 33 to the sleeve 34 and also clamping the tail 4O t'o' the hub-g 52 is a stud pin fast to the hub 33*and occupying the slot below the'clamping screw 36. By loosening the screw 36 the tail 40'can be adjusted vertically, the screw 36 when tightened serving to clamp the tail in its adjusted position. The pin 52 serves to hold the tail firmly in its adjusted position and prevent possible rotation about the clamping screw 36.

The extent of the swinging movement of the pull-01f arm and consequently the amount of under thread which is pulled oil depends upon the relative position in a vertical direction of the end 48 of the tail and the end 47 of the dog, because during the turning movement of the turret the end 48 of the tail first engages the end 47 of the dog and then as the tail swings said end 48 wipes over the end 47 of the dog. If the adjustment is such that the lower edge of the end 48 just barely en- 'gages the end 47 of the dog then the tail will wipe over the dog after the arm 31 has had a slight swinging movement while if the tail 40 is adjusted downwardly then said tail and the arm 31 will have a greater swinging movement before the end 48 wipes over the end 47 of the dog. By this simple means the action of the pull-off arm can be regulated so as to pull off the desired amount of under thread at the end of each buttonhole.

58 indicates a stay cord guide through which the stay cord is guided to the throat plate, said guide being of the type which will permit the stay cord to be fed forwardly but will prevent retrograde movement thereof.

In the construction shown in Figs. 5 and 6 the hub 33 of the pull-off arm 31 is clamped 65 to the sleeve 34 which is retained on the head fin 64. tobe,

"rotatively mounted thereon, mechanism 35-of'the stud-16 by the engagement of the pin 38 in the slot 37 of the sleeve.

In Figs. 9 and I have shown a slightly difierent construction. In thisembodiment the pull-off arm is indicated at 31a and it is shownas detachably secured to a hub member 33a that is rotatively mounted on the head 35a ofthe stud 16a which forms the 'pivotfor the looper-carrying block a'nd which corresponds to the stud 16 in Figs. 5 7 land 6.

1 The pull-offar1n31a is shown as'adjustably clamped to an'arm' 61 extending from the hub 33a by meansof ascrew62, said pull-off arm having a slot 63 which permits 0 the pull-off arm to be vertically adjusted.

The hub. 33a'is mounted on the head a of the stud l6a-so as to freely rotate and it is retained on said head by a retaining fin 64 which passes through aslot 65 in the hub 33a and-enters an annular groove 66 formed in the head 35a. This locking fin 64is shown as carried by a resilient finger 68 which is secured to the hub 33a by asuitable screw67. The resiliency ofthe'finger 68 permitsthe Withdrawn: from the groove 66 thereby permitting the hub 33a to be slipped off from the head 35a in case it is desired to remove th'e'hub 33a and pullolf finger.

Iclaim: 1; In a' buttonhole sewing machine, the combination with astitch frame, of a turret stitch-forming including loopers pivotally mounted on the turret to oscillate about' a commonaxis, a thread pull-off arm pivoted co-axially with the loopers and adapted to engage the under. thread to pull; a length thereof from the source of supply, and means toactuate the-pull-off arm after the sewing operation is completed.

2. In a buttonhole sewing machine, the combination with work-holding means, of; a

stitch frame, stitch-forming mechanism carried :by the stitchframe and including oscillatingloopers operatingon the opposite side of the work from theneedle, a turret on which said loopers are pivotally.mounted,anunder thread pull-off arm pivoted-on the turret coaxial with the loopers, said turret having a rotary movement after the stitching .operation is completed, and means rendered operative by such rotary movement to actuate the pull-off arm;

3. In a buttonhole sewing machine, the combination with a stitch frame, of a rotary turret mounted thereon, stitch-formingmechanism including loopers mounted on the turret for oscillating movement,an under thread 'pull-oif'arm pivoted co-axially with theloopers said turret having a reverserotative movement after the completion of the stitching of the buttonhole,a"tail depending from the pull-01f arm-and'a dog carried by the stitch frame adapted to engage said tail during such -130 reve-rse rotary movemen thereby to actuate the pull-off arm, 7 i

4. In a buttonhole sewing machine, the combination with a stitch frame, of a rotary turret mounted there n, st tch-forming mechanism including loopers mounted on the turret for oscillating movement, an under thr ad pull-cit arm pivoted co axially with the loopers, said turret having a .reverse rotative movement after the completion of the stitching of the buttonhole, a dog carried by the stitch frame and a tail depending from the pull-off arm and adapted to engage and. wipe over the dog during the reverse rotary movement of the turret thereby to actuate the pnll o-ff arm.

5. In a buttonhole sewing machine, the combination-with a stitchtrame, of a rotary turret mounted thereon, stitch-forming mechanism including loopers mounted on the turret for oscillating movement, an under thread pull-ofl arm :pivoted co-axially with the loopers, said turret having .a reverse rotative movement after the complecan tion of the stitching of the buttonhole, a dog carried by the stitch frame and a-tail depending from the pull-off arm and adapted to engage and wipe over the dog during the reverse rotary movement of the turret thereby to actuate the pull-off arm, said tail being adjustable vertically thereby to provide for a variation in the amplitude of swinging movement of the pull-off arm and a corresponding variation in the amount of thread vdraw-n ofl', c

,6. In a buttonhole sewing machine, the combination with a stitch frame, of a turret .rotatively mounted thereon, said turretlla-v- .ingva throat plate, stitch-forming mechanism including oscillating loopers pivotally mounted on the turret, an under thread pull- ;ofi' arm pivoted on the turret co-axially with the loopers and adapted to engage the under thread between the throat plate and the work, said. turret having a reverse rotary motion at the completion of each buttonhole, and means rendered operative'by said reverse rotation to actuate the pull-off arm.

7 In a buttonholel sewing machine, the combination with a stitch frame, of a turret rotatively mounted thereon, said turret having a throat plate, stitch-forming mechanism including oscillating loopers pivotally mounted on the turret, an under thread pulloff arm pivoted on the turret col-axially with the loopers and adapted to engage the under thread between the throat plate and rthe work,said turret having a reverse rotary motion at the completion of each buttonhole, means rendered operative by saidreverse rotation to actuate the pull-off arm, and means for varying the amplitude of the pulling-oil movement of the pull-ofi arm. 8. In a buttonhole sewing machine, the combination with a stitch frame, of a turret rotatively mounted thereon and havin a verse rotation at the end of each buttonh e,

sti chforming m chanism including a loope arrying block and loopers pivotally mounted on the turret, a stu on which said block oscillates, said stud having an extension, :1 thread pu hofi" arm pivota y ou ted on the stu e en ion andadapted to en gage the under thread to pull a length from he source of supp y, and mea s. to actuate annular groove, a thread pullsofi'. member a piv tally mo n d on he st d ex ension and d p d t engage the under hread to pull a length from the source of supply and means to actuate the pull-off member, and a sprin pressed locking fin carried by said member f and adapted to engage in said groove to re in the member o h stud- 1 In testimony whereof, I have signed my name to this specification.

CARL ,A- O- G

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