US1096369A - High-speed revolving-hook sewing-machine. - Google Patents

Description

R. K. HOHMANN.

HIGH SPEED REVOLVING HOOK SEWING MACHINE. APPLICATION FILED MAR. 20, 1913.

1,096,369. Patented May 12, 191% 6 SHEETSSHEET l.

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. MZZ ZW QFAL R K. HOHMANN. IGH SPEED REVOLVING HOOK SEWING MACHINE.

APPLICATION FILED MAR. 20

Patented May 12, 1.?14.

R. K. HOHMANN. HIGH SPEED REVOLVING HOOK SEWING MACHINE. APFLIVG.A TION FILED MAR. 20, 1913.

Patented May 12, 1914.

6 SHEETS-SHEET 3.

SAX/01mm R. K. HOHMANN. HIGH SPEED REVOLVING HOOK SEWING MACHINE. v APPLICATION FILED 11,512.20, 1913. 1 05136 369, Patented May12,191

6 $HEETS-SHEET 4.

R. K. HOHMANN.

HIGH SPEED REVOLVING HOOK SEWING MACHINE. APPLICATION FILED MAR. 20, 1913.

1,096,369. Pa ented Mayl2,1914.,

e SHEETS-SHEET 5.

Patented m 12, 1914.

6 SHEETS-SHEET 6.

R. K. HOHMANN. HIGH SPEED REVOLVING HOOK SEWING MACHINE. APPLICATION FILED MAR. 20, 1913.

7 7% 99 m l/zflavd W30 .Mf YS- @FFEIQE GALIFOILNIA.

' Jfl'lJG-DIACHINE.

un pufleys cal-r5196. by the tw sha ts, L ii" will be vbserved that the pulley on ww er 15111111, 10 is smaller than that on noportens being such as 10 two revolutions for the-shaft 6. urward end a rotary has in the form shown is n m h) brad-zen as "possible unnecessar of the casmg Lion on 112:1 i 3 pin tu,

flusad from t A bail on standn in the .w W 5 116" H therewith :ml fleeting as; town-t mbbin 19 mad-'3 mu 1 larger than tin m rota 3 hook nacpmos angle innmmt of thread. thus racim You! Juwnand 0f H1 theedge of the bol'ibin and being curved in can pass. A spring 30 of any suitable construetion is preferably used in the back of the casing around the shaft 23) to press the bobbin out against the retaining member 25 so as to hold it firmly in position preventing rattling, and this spring may be made in the shape of a thin plate as shown in Figs. 5 and 8 having arms bent to bea r against the back wall of the casing. It will be Ol'lSQlVOfl that the retaining member 25 can be turned on its pivot 26 until the shorter end of it is in line with the shaft 23, and the spring 28 may be allowed to draw it partly within the shaft so that the bobbin can pass over the retaining member and into position around the shaft and then the retaining member can be -withdrawn and turned into the position shown in Fig. 5 where it will hold the parts in place. The bobbin holder has a portion 31 removed at one point on its circumference and the bearing rim 17 is also cut away at this point terminating on one side in the sharp hook or point for engaging the loop of thread. In operation this cut away portion of the bobbin holder will be at the top so thatthe needle may enter it forming the loop in position to be carried againstthe hook 32 by the-hook 15 on the revolving ring. It will be observed that the hook 15 has an. inclined surface leading down to the contracted end of the opening 33 and thus when the loo is engaged by this hook the thread will e carried into the 'point 33 which is across the bearing groove 16 so that. the thread iscarried by' the book from the forward side to the rear side of the hook 32 and as the ring 12, rotates the thread will necessarily be engaged by the hook it will be observed that the'bobbin holder being loosely mounted within the hook ring would turn with it unless means are provided for preventing its rotation and therefore I. have made use of two oscillating arms adapted to alternately enter the openings 34, 35 more forward or inclined face of the casing so as to prevent it from turning its the hook turns. it will be seen by reference to Fig. 1 that these openings are in the upper portion of the casing and the arms 35 and 36 which enter i'lltli'! are pivoted at the sides of the casing extending upwardlv. and having inwardly projecting ends entering the openings. The arms 35 and 36 are piv oted to shafts 37. 38 which have secured to them short arms 3 40 and a link 11 is pivoted to and connects tin: ends of those arms whereby the arms 3;"; and lt? will move together. A link 1-2- is connected to the link 41. and is pivoted at 43 to an arm carried by the rock shaft 44-. The rock shaft 44 extends-along the machine from the front to a pointbelow the hollowstandard 2 and at that point has secured on it an arm 45 to which a rod 46 is pivoted, that rod having on its upper end a bearing, member 47 fitting a cam 48 carried by the upper rotary shaft 6. The rotation of the shaft 6 thus reciprocates the rod it rocking the shaft 44 and to the link ctmnectious rocking the arms and 36 on their pivots to make them alternately engage and disengage the bobbin casing, one of those arms always being in engagement. The timing of the operation of these arms is of course so adjusted that each arm will be disengaged at the time that the loop of thread is being carried to and past it by the book 15. It will be. observed that the guide member 49 is secured to the under surface of the face of the machine and projects down around the end'of the arm 3:7 so as to guide the thread as the loop is being pulled up preventing it from beingcaught by the inwardly projecting end of the arm 35, this guide member being shown in the form of a Wire.

The mechanism for feeding the cloth embmlies a feed arm 50 which is pivoted at one end and which has the rat het teeth 51 at the other end adapted to proje t slightly up through an opcnin s in the work plate of the machine hnniediatclv below the presser foot. The feed arm is pivoted to the upper end of an 'arm 52 carried by the rock shaft 53 and it will therefore be seen that when the shaft. 53 rocked the arm 50 will move back and forth acro s the maehino to give the necessary feed to the (cl-1th. The shaft 53 extends along the machine to a point beneath the standard 2 and at that. point has an arm 54 se ured to it. A link 55 is pivoted to the arm and to a link 56 at its opposite end. The link 56 is pivoted at one end to the rod 57 which rod is .held in place rigidly by a clamping screw 58 but which can be moved to ditl'orent positions around the we 9 within the slot (it) above the work plan o the machine. This movement ot'thc rod :1; to different positions changes the angle of the link 55 to the link .36, these two links operating as a toggle and thus the le erage position of the rod 37. The rod (30 is pivotod at (31 at the point where links and 50 are homiccted imd this rod 60 extends up tlh'ough the hollow standard 2 having at its upper end a bearing n'lember tit ng over a i-m carried by the rotary shaft is so that as the shaft (3 turns the rod 30 will be recipro cated. The change in the leverage or angle due to the change in the position of the rod 57 will cause this reciprocation of the rod (30. I

to have a dilferent effect on the shaft 53 a so turning it diiicrent amounts according to the adjustment. It will oe observed that the rod 57 car be adjusted at any time without interfering with the operation of any parts of the machine and that the adjustment can be macle'even while the machine is in operation to change the feed and consequently the length of the stitch.

The feed bar 50 must not only be reciproeatef but must be raised and lowered at the proper time to feed the cloth and the means for causing this and fall of the feed bar is shown in Figs. 1 and l. A rock shaft 62 mounted below the work plate oi: the machine adjacent the shaft 53 and it is connected by means of the arm (33 and rod 64 to a cam on the rotating shaft (3 whereby it will be rocked as the shaft 6 turns. At the other end of the machine and beneath the head carrying the needle bar, the shaft 62 has secured thereto an arm ()5 which has flexible onnection to an arm (36 secured to the feed bar 50, the arms and 66 being substantially parallel and turning simultaneonsly on their pivot. The connecting means shown consists of a member 67 having its ends fitting in sockets in the arms 65 and on so as to maintain the spaced relation of those arms and a coiled spring 68 which is under tension tending to draw the two arms together. 1 By this airangementthe oscillation of the arm will be imparted to the arm (its and will thus give the feed arm its up and down motion, and this operation will take place without interfering with the horizontal motion imparted to the arm 50 by the rock shaft 53.-

l'laving thus described the invention, What claimed is: I

3.. The combination with a rotary shaft of a revolving hook ring carried thereby, a bob bin holder mounted in said ring, a rock sli-att, two arms pivoted at their lower ends on opposite sides of said holder and extending upwardl in front of said hook ring to engage said holder on opposite sides to prevent rotation, linii connections from said rock shaft to said arms at. points near their pivots whereby a. small movement of said link connections will cause a much larger movement of the operative ends of said arms, and means for oscillating said rock shaft, periodically.

L. The combination with a rotary shaft of a revolving hook ring carried thereby, a bobbin holder mounted in said ring, a. rock shaft,

two arms separately pivoted and adapted'to engage said bobbin holder on opposite sides alternately to prevent rotation, link arm 00nnections bet-ween said arms near their ivots to said rock shaft, and means for osoil ating said shaft periodically.

3. The combination with a rotor shaft of a revolvin hook ring carried there y, a bobbin holder mounted in said ring, a rock shaft, two arms separately pivoted and adapted to engage said bobbin holder on opposite sides alternately to prevent rotation, link arm connections between said arms near their pivots to said rock shaft, and means for giving said rock shaft 3 quick oscillation once during two revolutions of said hook ring.

4. In a sewin machine, the combination with the table pita, of a rotary shaft above said plate for operating the needle bar, a rotary shaft below said late carrying a rotary hook ri on its en a bobbin holder with a cooperating hook within said rotary hook ring, arms adapted to alternately engage said holder on opposite sides to prevent rotation, means operated by said needle bar shaft for turning said rotary hook shaft, and independent means operated by said needle bar shaft for alternately moving said arms into and out of engagement with said bobbin holder to permit the passage of a loop of thread.

5. In a sewin machine, the combination with the table plate, of a rotary shaft above said plate tor operating the needle bar, a rotary shaft below said plate carrying a rotary hook ring on its end, a bobbin holder with a cooperating hook within said rotary hookring, arms adapted to'alternately engage said holder on opposite sides to prevent rotation, cloth feeding mechanism below said plate, means operated by said needle bar shaft for turning said rotary hook shaft, independent means operated by said needle bar shaft for alternately moving said arms into and out of engagement with said bobbin holder to permitthe passage of a loop of thread, and independent means for operat-v ing said cloth fee-ding mechanism from said needle bar shaft.

In testimony whereof I a ix my signature in presence of two vitnesses.

llClL -ill D K. HOHHANN. lVi tncsses \VILLIAM L. Pianos, JAcon Barn.

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