US1181160A - Bobbin-controlling device. - Google Patents

Description

W. N. PARKES.

BOBBIN CONTROLLING DEVICE.

APPLICATION mgr), MAY u, 19m.

1,181,1 6Q. Patented May 2, 1916.

manner with a tension device actin un -"ran sra'rns PATENT OFFICE.

WILLIAM N. PARKES. 0F BROGKLYI-I, NEW YORK, ASSIGNOR TO TH'E'MNGEIQ MANU- FACIURIHG (DOMPANY, A CORPORATION OF NEW JERSEY.

BOBBIN-CONTROLLING DEVICE.

Specification of Letters Patent.

Patented May 2, 1916.

To all whom it may concern:

Be it known that I, Wni'cmar N. PARKES, a citizen of the United States, residing at Brooklyn, in the county of Kings and State 5 of ew York, have invented certain new and useful Improvements in BobbiInC/ontroliing Devices, of which the following is a specification, reference being had therein to the accompanying drawings.

In my patent applications Serial Nos. 835,843 and $35,8ii, filed May 2, 1914, I have shown a loop-taker comprising a rotary loop-seizing member having a threadrase journaled therein and provided With an es- 5 capeinent device for restraining the same against rotation while permitting the needle-thread loops to be freely cast about the lower thread The thread-case of the said applications is provided in the usual upon the lower thread drawn from the ho bin.

In certain classes of work, and under cer tain conditions, it has been found undesirable to apply a continuous tension to the lower thread. and my present invention has for its object to dispense with such constant tension and to apply a yielding resistance to the delivery of the bobbin-thread only at certain stages of the stitch-forming cycle,

and particularly during the setting of the stitches? In the preferred embodiment of the. pres ent improvement, the bobbin-case holder, comprising a rocking yoke with convergently directed lingers at the extremities of its component arms for alternate engagement with the bobbin-case, has yieldingly mounted thereon a bobbin-controlling finger adapted to periodically enter the bobbin cavity of the thread-case for engagement with the rim of the bobbin-flange. By this means a yielding resistance is offered to the rotation of the bobbin and hencea drag is imposed upon the lower thread under the 5 action of the take-up upon the upper thread in setting the stitches.

T he invention will he understood by reference to the i-iccoinpanying drawings, in which Figure 1 is an elevation of a part of; the sewing machine containing the stitch form ing mechanism, partly insection; and Fig. 2- is a front end elevation of the same with the bed-plate in transverse section. ii 3 is an 5 end elevation showing the loop-taker and the bobbin-case holder and bobbin controlling arm. Fig. 4 is a perspective view of t e bobbin controlling arm. Fig. 5 is a sectional elevation on line 5-5 of Fig. 1 showing the actuating means for the bobbin-case holder and bobbin cont-roller.

The machine is shown constructed with the usual bed-plate 1 beneathlwhich is journaled the rotary loop-taker shaft 2' ufi'onthe forward end of which is fixed the cupshaped lo0pseizing member 3 formed with the beak 4 and provided with a central tln-ead-cavity in which is journaled the bobbin-case 5. The bobbin-case is constructed with an axial thread-cavity having disposed centrally thereof the bobbinsustaining post (3 upon which is journaled a wellknown form of disk-bobbin formed with a tubular hub portion and end-flanges 7, being confined in position thereon by the latch 8.

The outer end of the thread-case is provided with the forwardly projecting lugs 9 having transverse notches 10 adapted to be entered by the convergently arranged and opposed fingers 11 of the rocking escapement yoke 12 which receives a rocking movement for each rotation of the loop-seizing member or hook 3. This yoke constitutes, in conjunction with the notched lugs 9, an escapement by means of which the thread-case is restrained against rotation with the hook in a manner well known, the fingers 11, which are arranged concentrically with the axis of motion of the yoke, being alternately retracted so as to permit the free passage of the needle-thread loops in the loop-casting operation. As represented in the drawings, a loop-guard flange 13 sustained by the bobbin-case is formed With an the flange 20 to'which is rigidly secured the 195 yoke 12.

Fixed within the rearward end of the rock-shaft 19 is'the bushing 21 having fitted therein the rearward end of a second rock" shaft 22 having secured upon its forward end by the transverse pin 23 the plug 24 provided upon its outer extremity with the transverse tongue or rib '25. Secured upon the forward end of the plug 24 by means of the screw 26 is the hub 27 of the curved bobbin-controller arm the hub 27 being formed with a transverse notch or groove 29 entered by the rib of the plug 2t. The bobbin-controller arm 28 is provided upon its outer extremity with the backwardly eX- tending lip 30 beveled at 31 upon the edge toward which the needle-thread loops are carried by the hook, or at the left as viewed from the front of the machine.

The inner [rock-shaft 22 is confined against endwise movement at one end by engagement of the hub 27 with the adjacent face of the yoke 12 and at the other end by engagement of the washer 32, secured thereto by the screw 33, with the end of the bushing 21. The two rock-shafts are resiliently connected together by means of the spring 34 surrounding the inner rock-shaft and having one end secured in the bushing 21 and the other in the plug 21, a stop-pin 35 engaging the controller arm 28 in oppo sition to the spring in the retracted position of said arm, as represented in Fig. 3.

Secured upon the rearward end. of the tubular rock-shaft 19 by means of the clampscrew 36 is the split hub 37 of a cranlcarm 38 formed with a forked extremity 3!) within which is fitted the slide-block 40 trans versely apertured to fit the-actuating eccentric 41 upon the loop-taker shaft By this means the rock-shaft 19 receives an oscillation for each rotation of the loop-taker shaft.

In the operation of the machine, the needle 42 depends through the throat-plate 43 and presents a thread-loop which is seized by the hook and carried backwardly and downwardly around the bobbin-case, the yoke 12 being rocked to the left. as represcntcd in Fig. 2, to permit the free passage of the thrcad-lco 'i. while the finger 11 at the opposite side of the bobbin-case remains in engagement with the latter to detain it against rotation. In this position of the parts, the sidc-tacc ot' the lip 30 of the bobbin-controller which enters a depression 5 in the outer end of the bobbin-case. rests in contact with the rini of the bobbin-flange 7 under the action of the spring 34 and imposes a yielding resistance. to the rotation of the bobbin. As the beak 4 of the hook continues its movement beyond cast-off position. as represented in l ig. 2, aml passes bcncath the loop-guard 13, the yoke 12 is rocked toward the front of the machine, as rcprcscntcd in Fig. 3. thereby retracting the. holding lingcr ll at that side and advancing the other of said fingers into operative cngagemcnt with the bobbin-cases. In this movement of the yoke, the stop-pin 35 en gages the controller-arm 28 and retracts the same from engagement with the bobbin in opposition to the spring 31, whereby a free passage is afforded tor the needle-thread loop in being drawn by the take-up.

The present machine. as represented in the drawings, is one in which the hook performs two rotations for each reciprocation of the needle, and in the succeeding rotation of the hook the described movements of the thread-case holding yoke 12 and the bobbin controlling arm 28 are repeated.

In my Patent No. 875.613. of Dec. 31, 1907.,a friction device applied directly to the side-face of the bobbin is shown applied to a machine constructed with a rotary hook turning upon a vertical axis. Such construction is obviously unadaptcd for employment in a inachinc ot' the present form wherein the hook turns upon an axis disposed transversely to the direction of reciprocation of the needle and the present improvement is designed particularly for embodiment in a rotary hook machine of the latter type. The specific construction and arrangement of the component parts of the present bobbin-controlling means are evidently not material to the present invention, and may be considerably modified within its scope.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine. the combination with a rotary loop-seizing member, and a bobbin-case journalcd therein and formed with an axial bobbin-cavity to receive a bob bin, of a bobbin controlling member disposed wholly at one side of the bobbin-cavity and movable toward and from said axis for cngagcmcnt with the. rim of the bobbin in said cavity, and actuating means therefor.

In a sewing machine, the combination with a rotary lmip-scizing member, and a bobbin-case journalcd therein and formed with an axial lmbbin-cavity to receive a, bobbin. of a rcci 'n'ocatory holder for restraining the bohbiircasc against movement with the loop-seizing member, and 2. bobbin controller operatively connected tl cze with and adapted for yiclding engagement with a bobbin contained in said bobbincavity.

3. In a. sewing machine, the combination with a rotary shaft. a. loop-seizing member thereon. and a bobbin-case journalcd in said member and formed with a. cavity to receive a bobbin. of a rock-shalt disposed parallel with said rotary shalt. a liobbin-controllcr yicldingly sustaincd by said shaft and adapted to engagisaid bobbin. and actuating means for said rock-shaft.

-'l. in a sewing machine, the combination with :i rotary shaft. :1 loop-scizing member thereon, and a l)()lll)lll(i;k. 't journalcd in said and. fimnad wiih. a cavity t0 receive n mmm mck siiaft, a b0bbinmam-43d \Ehwenn and adapted to Lwbbimcase fan restraining it ML a semnd z'mkshaft j0urihe tubular reek-shaft, a b0ban imbbin-cuz-xn 'ZAv'it) to engage n r-nsilient, connection between In riwrii shnfis, and smtuating means for mm? tannin! rmk-s'hnft f1. in ii sewing machine, time combinan mm a miury shaft, :2 kionseizing memiizez-mn, and a bahhin case journaied in nwmner and fornmd with a cavitv to reiw 1, iifiifibi'fl if a tubular rack-shaft, a; smurnd inerenn and zmn fixed thereon and adapt adapted to the bobbin-case for restraining it against miation, a second rockshaft journalvd within the tubular rockshaft, 21 bobbin--cnntrailing arm fixed thereon and adapted to enter the bubbinuase saw ity to engage i110 bubbin, :1 sprin 7 surrounding the 5(\'.(lfl li-ikllk1t(i ik'k-Filil t; and con nccted at opp: T 0 extremities with said rock-shafts, respectively. and actuating means for said tn'nuinr lurk-shaft.

n testimony hereof, I have signal my name to this speciticatinn, in the presence of two subscribing n itnesses.

WILLIAM N. PARKES. Witnesses HENRY J. MILLER, HENRY A. Knimmmnn, Jr.

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