US1091062A - Revolving-hook sewing-machine. - Google Patents

Description

R. K. HOHMANN. REVOLVING HOOK SEWING MACHINE.

APPLICATION FILED MAY 5,'1913A Patented Mar. 24, 1914 4 SHEETS-SHEET 1".

vlllw" lmiileullll Il" R. K. HOHMANN. RBVOLVING HOOK SEWINGMAGHINE. APPLICATION FILED MAY 5, 191.3. LOQLOGQ.

` Patented Mar. 24, 1914 4 SHEETS-SHEET 2.

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R. K. HOHMANN. RBVOLVING HOOK SEWING MACHINE.

APPLICATIOI FILED MAY5,1913.

Patented Mar. 24,1914;

4 SHEETS-SHEET 3.

R', K. HORMANN. REVOLVING HOOK SEWING MACHINE.

APPLIGATION FILED MAY 5; 1913.

Patented Mar. 24, 1914.

4 SHEETS-SHEET 4.

n sATns PATENT onFIon.

RICHARD-Ie Hermann, or ennvinnnn, ILLINOIS, Assrenon To NATIONAL SEWING MAcHinn conserva; or .BnLvInnnn, ILLINOIS, A conronArIoN or ILLINOIS.

entremise-facon,sewers-MACHINE.

Leeinee. f han@ Patented llfar. 24, 1914il To all whom it may concern.' 4 Be it known that l, RIQHARD A MANN, a citizen of the .United States, and

resident of Belvidere, county of l leone and State of Illinois, haveinvented certain new and useful Improvements vin Revolving-Hoch Sewing-llachines, of' which following' is a specification.

This invention relatesto sewing machines of the revolving hook type andhas particular reference to the means for retalning the bobbin holder against rotation while permitting a loop of thread to pass freely around it. f t

The novel features of the invention will be apparent from the ollowin description, taken in connection with the rawmgs.

In the drawings, Figure 1 is an end view of a machine showing my invention applied thereto; Fig. 2 is a detail viewfo the spool holder with the operating means 1n a different positiong. Fig. .-3 1s a longitudinal section through a machine embodying the invention; Fig. f1 is a bottomplan view; and Fig. 5 is a vertical section on the line 5-5 of Fig. 3. x

rlhe particular machine to which I have shown my' invention applied is of, the commercial type and some of the features of this machine are coveredby other applications which I am filing herewith.

The machine includes a base 1 carrying a rotary shaft 2 which o crates the revolving hook ring 3. An upright hollow standard el carries theIf shaftl 5 driven from the drive shaft 6 in the hollow'liorizontal arm 7. The drive shaft' operates the needle bar 8 carried in the head 9 of the machine and the shaft 6 is driven in any suitable way through the pulley 10. The shaft 5 has a bevel gear 11 0n its lower end meshing with a bevel gear on the end, of the shaft 2 whereby the shaft 2 will make two revolutions for each revolution of the shaft 5, and by this means it will be observed that the revolving hook makes two revolutions each time the needle reciprocates. They rotary hook is arranged below the elevated cloth plate 12, and thaty cloth plate has a movable section 13 in advance of the line 'followed by the stitch and a shield 111 extends downwardly from that section around the working parts beneath the plate. A link 15 is pivoted to the two parts of the workplate at an angle and a ing movement.

f guide 16 is secured to the under sur- K. .Horn

face of the iixed part of the plate at the rear edge. A projecting plate 17 is secured to .the under surface of the movable part on the opposite side and it enters asockct 18 on the xedpart. mits the forward part 'of the work plate'to be moved out of the way so as to give access to the rota-ry hook and other mechanism below the plate, andthse features are made the subject of a separate application.

The bobbin holder 19 has a bearing r'im fitting within a bearing groove in the revolving hook ring 3, and it is provided with a hook `20 near the top and facing the top for the purpose of engaging and spreading to be p aced within the holder with its' axis parallel t0 the axis of ,the bearing rim but notconcentric therewith being eccentric on the side opposite to that on which the hook is placed. The bobbin passes through an opening on one lside of the holder over a column or post which carries a member 22 longitudinally movable therein which has fitted to its end 'the retaining arm 23. This retaining arm extends out to the edge of the bobbin and is curved down over the edge within vthe margin of the holder and it serves the double purpose of holding the bobbin in place'and offering some resistance to its turnin movement, thus placing ten- "sion on theA t read drawn from the bobbin. 4Thesefeatures are also made the subject of a separate application. The present invention relates to the means for retaining the holder against rotation and that means includes an arm 2e ri idly secured to some Ypart of the frame o' the machine and having its end 25 extending downwardly into the path of-a portion of the holder so as to prevent any material turn- In the particular form shown the arm 24 has its end curved and extends very slightly within a depression or opening 26 in the face of lthe holder immediately behind the hook 20 and in the upper part of the holder. The depression or opening 26 is wider than the end 25 of the arm 24 andtherefore when the arm occupies a position in the center of the opening a loop of thread may easily and freely pass down between the end and the holder without meeting any resistance.

This construction per" the loo of thread. A bobbin 21 is adapted.

On the side of the holder opposite the" arm- 24 I make'use rock so as to bring the finger 27 into and out of contact with the projection 28. When the finger 27 is in contact with the projec tion as shown in Fig. 2 the holder is moved or rotated slightly in the reverse direction.

to the movement which the rotary hook tends to give to it and it is moved only to such an extent as to bring the end 25 of arm 24 into the center part of the opening or depression out of contact with any part of the holder. When the finger 27 is in contact with the projection 28-it will prevent any turning under the influence of the rotary hook and thus the end 25 of arm 24 is held out of contact with the walls of the opening into which it projects. The operation of the arm 29 is timed that the finger 27 will engage the holder as the loop is b'eing carried down by the hook 31 toward the arm 24, and therefore the loop can pass freely beneath it. After the loop passes the end the arm 29 moves back carrying the finger 27 out of Contact with the projection 28 and thus the loop can ride up the inclined surface of the projection 28 and passes the end of the finger 27 freely. The end surface of'the finger 27 being upwardly inclined avoids the possibility of catching the thread and this inclined arrangement is utilized to engage and depress the projection 28 turning the holder as above described. In order to guard against an accidental engagement of the loop with the arm 24 I preferably secure to it a guide 32 which extends upwardly toward the hook 20 so as to guide the loop down to the point of the arm 24.

It will be understood that in its broader aspects my inventionl is not limited to the particular means for causing the slight relative movement between the retaining arm 24 and the bobbin holder so as to permit the loop to pass freely between them and is furthermore not limited to the particular means for operating the finger 27. I have shown the finger 27 operated from the same shaft which operates the feed mechanism. v

As shown in the drawings the feed member 33 is pivoted at one end to an arm 34 carried on the rock shaft 35 and the rock shaft 35 is Igiven an oscillating movement by means of the link arm 36 which is given a longitudinal movement by the means shown in Fig. 5. That means' constitutes the subject of another application but it in` cludes a sliding block 37 guided by the parallel arms 38 on the end of the link arm 36 and an eccentric 39 worksin that slide block and is secured to the shaft 6. A link arm 40 is pivotally connected to the linkl arm 36 between its ends and extends there from at an angle being pivotally connected at its other end to the bell crank 41. The bell crank can be turned by a thumb screw 42 to different positions along the slot 43 -so as to vary the angle of the link arm 40 tothe link arm 36 and to thereby vary the amount of movement imparted to the shaft 35and consequently the length of the longitudinal movement of the feed bar 33. The feed bar is given its up and down movement by the rock shaft 44 which is oscillated by the link 45 operated by the eccentric 46 on shaft 6. There is a link connection between an arm on shaft 44 and the end of the feed member 33 consisting of the rod 47 having ball and socket connections at its ends and the spring 48. v

The rocking arm 29 is operated from the rock shaft 44 which gives the up and down movement to the feed bar by means of an arm 49 and a link 50 `and since the shaft 4 4 makes only one oscillating movement during two revolutions of the revolving hook it will be observed that the finger 27 will be brought into engagement with 'the holder but once during two revolutions of the hook and as above stated this action is so timed that it' will occur just as the hook is carrying the loop of thread down toward the arm 24.

I-Iavi'ng thus described my invention, what I claim is:

1. In a revolving hook sewing machine, the combination with a bobbin holder, of a rotary hook for passing a loop of thread around said holder, a fixed arm projecting slightly into an opening in the face of said holder. on one side to prevent its rotation and a rocking arm on the opposite side o said Holder below the top for engaging said holder on its inward movement Vto turn it sufficiently to bring` it inte a position where the fixed arm will be out of Contact with the walls of said opening in said holderand means for operating said rocking arm at each alternate revolution of the rotary hook.

2. In va sewing machine, the combination with a bobbin holder having a. hook for spreading a loop of thread and an opening in the upper part of its face behind said hook, of a revolving hook for passing said loop around said holder, a fixed arm having a downwardly inclined end projecting slightly into said opening to prevent the rotation of saidholder, and means for moving said holder to such an extent that said arm will be out of contact with the walls of said opening in said holder when said loop approaches said arm thus allowing a free passage of the loop beneath said arm.

3. In a sewing machine, the combination witha bobbin holder having a hook for spreading a loop of; thread and an opening in the upper part of its face behind said hook, of a revolving hook for passing saidv loop around said holder, a fixed arm having a downwardly. inclined fend projecting slightlyinto-said opening to .prevent the ro tation of s:iid.hol der, and a movable finger having an upwardly inclined under surface adapted to` engage theupper portion of said Iholder :on 4the side vopposite', to said fixed arm and below. the top to move. it slightly, and means for. operating said movable. finger." u

v 4. In a sewingv machine, the combination with a b obbin holder having a:hook 'for .spreadinga loop of thread and an opening in the upper partof its face behind said" hook, of a revolving hook for passingsaid loop around said holder, a fixed arm having a downwardly inclined'. end projecting slightly into said opening to preventthefrotation of said holder a projection on the upper portion of the holder on the side oposite to said opening having 'anupwardly inclined lower surface, a movable finger' having an upwardly inclined lower surface adaptedto engage the. upper end'of said projection to move said holderslightly, and

' means for operating said movable finger.

5. In a sewing machine, the combination with a bobbin holder having a hook for spreading' a loop ofthread 'and an opening in the upper part of its face behind said hook, of a revolving hook for passing said loop around said'holder, a fixed'arm having a downwardly inclinedA end projecting slightly into said opening to prevent the rotation of said holder, a projection on the upper portion of the holder on the side 'opposite to said opening havin an upwardly' inclined lower surface, 'a roc ing arm piv'- oted at its lower' end and oarrylng a laterally projecting finger at' its upper end having an upwardly inclined lower surface a'daptedto engage the top of said projection,

and means 4for rockingsaid' arm.

6. Ina sewing machine, the combination" wlth a bobbni holder having a yhook vforspreading aloop of thread and an opening in the upper part of its face behindsaidhook, ofi' a revolving hook for passing said loop around said holder, a fixed arml having a downwardly inclined end project-ing slight-ly into said opening to prevent the-rotation of said holder, means-` vfor `moving said holder to such an extent that-said arm. will be out of contact with the Walls of said point of said a'ifinf-4 opening I said. holder "when said apguide extending upwardlyjfrom said fixed larm for. directingthe 'loop-.off thread to the said .plate and adapted to pass a loop of thread aroundit, a clothfeeding member, t

means forreciprocating said member, means for. raising andy lowering-said member at.

vthe combination 'with' a 'needle 'and needle bperating mechanisin'g ofgafc'loth plate, a-b'obbinholder and a:

yrevolving" hoolrcarrying said holder below venting 4any substantial :rotation ofsaid Awith a needle and needle.oper'ating mechanism, of a cloth plate, a bobbin holder and a `revolving hook carrying said holder below holder while permitting the free passage of said plate and adapted topass a loop of thread around "it,a cloth feeding member, means for reciprocating said member, means for raising and lowering said member at each alternate revolution .of said revolving hook including a rock shaft, means for preventing any substantial rotation of said holder while permitting tlie free passage of the loop around it including an upwardly ex'- tended arm pivoted at its lower end carrying a finger at its upper end for engaging' said holder, and link connections between said arm and roel; shaft for operating said fingerto engage and disengage said holder. 9. 'In a' revolving hook se\ \'ing"mac1iine, the combination with a bobbiri holder, of a rotary hook for passing a loop of thread around said holder, cloth 4feeding inecli'anism, an armV having its' end in the patlrof s aid holder to 'prevent rotation, a4 movable. arm adapted.to engage said holder on the opposite .side to rotate it slightly out of contact with said first mentioned arm and means for operating said movable arni'from said feed operating mechanism at leach alternate revolution of the hook.

In testimony whereof I affix my signature in presence-4o' twowitnesses.

i' RICHARD K. H OHMANN. Witnessesz

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