US1912150A - Shoe sewing machine - Google Patents

Description

May 30, 1933. o. LAWSON SHOE SEWING MACHINE Original Filed June l2, 1929 3 Sheets-Sheet 1 Inventor May 30, 1933. o. 1 LAWSON 1,912,150

SHOE SEWING MACHINE Original Filed June l2, 1929 3 Sheets-Sheet 2 Wit/2655 [nz/@i1 im" Chas. l" Oban l May 30, 1933. o. L. LAWSON 1,912,150

SHOE SEWING MACHINE Original Filed June 12, 1929 3 Sheets-Sheet 3 Patented May 39, 1933 unirse srAiss PATENT'. Ortise- OSCAR L. LAVSON, 0F LYNN, :MASSACHUSETTS ASSIGNOR T0 NITED SHOEl MACHNERY CORPORATION, OF 'RATER-SCN, NEW JERSEY, A CORPORATION' OE NEW JERSEY SHOE SEWING MACHINE Original application led .Tune 12, 1929,Sera1 No.- 370,343. Divided and this application ledvNovemb'er 5, 1931. Serial No. 573,041.

The invention relates to shoe sewing machinos and is herein disclosed as embodied in a lockstitch horn shoe sewing machine of the McKay type fory sewing'together the insole, upper, and outsole of a shoe.

The object of the invention is to provide certain mechanisms. of modified and improved construction and operation which are particularly adapted for use machine of3this description'and contribute Vin producing a more eiiicient and economical machine which will operate smoothly and accurately'at higher speeds than` previously attained without excessive Wear and tear on the parts. c

The lockstitcli shoe sewing machine herein described and illustrated, isrof the gen'- eral type shown and described in thejpatent to James H. Reed, No; 1,688,056, dated October 16, 1928, for sewing the outsole to the insole and associated upper` of a shoe. The machine herein disclosed includes a straighthooked needle and a shuttle, as in the machine of the above-mentioned patent, at the upper side of the work, a whirl containing horn on which the work is supported, a presser foot, and an awl which acts to feed the work, together with take-up and stitch setting mechanism to draw the needle loop over the shuttle and set the stitch.

ln oreer to permit the worlr to be fed quickly and accurately into position for each successive stitch, the present invention contemplates tlie provision of a novel and improved mechanism for imparting to a feeding element adapted to engage with the Work a positive four-motion feeding movement. l

The several features of the invention consist also in the devices, combinations, and arrangement of parts hereinafter described and claimed which, together with the advantages to be obtained thereby, will be readily understood by one skilled in the art from the following description taken in connec tion with the accompanying drawings in which Fig. l is a View in left side elevation of the head of a lockstitch shoe sewing ma'- Y chine embodying the several features of the invention; Fig. 2 1s a view in front elevation of the head of. themachine vshown in Fig. Vl; Fig; L3 is an enlarged view in right side elevation of a portion of the head'of the machine; Fig. i is a sectional plan `View taken on the line 4-4 of Fig. 2;' andFig.

5 is a viewin front elevation ofthe'parts shown in Figgl viewed from theplane indicated by the line 5--5 on Fig. 4f.

Referring t0 .the drawings, the Strain hooked needle of the machine is .indicated .-y

at 8 secured tothe lower endof a needle bar l0, the shuttle at 12 provided with a shuttle hook la forpassingthe'needle loop around the shuttle, lthe presser foot at 16, the awl at 18and the worlisupporting horn at 20.

ln order to ,permit` the work to loe fed i accurately and certainly past the stitch forming r devices, a positive four-motion feeding movement isimparted to the awl through mechanismwhich embodies certain features of the present invention.` The awl is secured to the lower end of an awl carrier 76 which is mounted to slide vertically in a slot formed in an awl carriage 78.- Two parallel links'SO pivotedv at points 82 on the Y machine frame are provided to support the carriage for movement substantially in thel line of feed. With this construction, a high speed .of operation may be readily attained vwithout undue'vibration or inaccuracy in the operationof thepeuts;- The operating' connections from the cam l'shaft t-Sformoving the awl vertically toiand from the work and-,horizontally in the line of feed comprise a rock shaft 86 which is journaledin bearings 88 and90 in the machine frame and carries atV its forward end a lever arm 92. Movement is transmitted fromfthe lever i 92 to 'move theawl vertically towards and away fromthe work by means of a sliding connection with the upper end ofthe awl-carrier 1.76 which comprises a cam block 94e pivotally secured to the end of the lever arm 92 and adapted to'slide' in a horizontal slot 961formed lin the uliiperi-nd of the jawl carrier 76;.V The rock shaft 86, is

given an oscillatory movement for each rotation of the camshaft 48 through connections including al cam lever 98 Which is loosely sleeved to theV rock shaftSG and is provided with a cam roll 100 to engage in a cam path in the cam disk 102 on the cam shaft 48.

In order to permit an adjustment of the vertical limits of movement of the awl'with relation to the work, means areprovided for adjusting the initial position of the rock shaft 86 and lever 92 with relation to the positively actuated cam lever 98 comprising a flange 104 formed on the hub of the lever 98 which is engaged. on either side by two set screws 106 in a` sleeve 108 fixed on the rock shaft 86 by means of a setv screw 110.

A reciprocatory movement is imparted to the carriage 7 8 in the line of feed from the cam shaft 48 through connections which includea sleeve 112 which surrounds the rock shaft 86 and is provided at its forward end with a lever arm 114 off-set from the sleeve. The lever arm 114 and thesleeve 112 are oscillated .through a definite arc for each cycle of operations ofthe machine by means of a cam lever 116 which is loosely sleeved on therock shaft 86 and is positively operated by the engagement of a cam roll 118 in a corresponding groove in the face of the cam disk 120. An adjustable. connection is providedgbetween the cam lever 116 and the sleeve 112 which comprises a flange 122 -formed on the hub of the cam lever 116 and two set screws 124'mounted on the sleeve 112 to engage the flange between them. The carriage 78 is actuated from the lever arm 114 through connections which are adjustable to vary the length of the feeding stroke imparted to the awl without varying the forward limitof the awl stroke which must remain constant to cooperate properly with the other sewing elements of the machine. rlhese connections comprise a bracket 126 Y which is mounted'for adjustment on ways 128 on the lever arm 114 and is held in adjusted position on the arm 114 by means of two small set screws 130. The bracket 126 is also provided with a pin or roll 132 which is adapted to ride in a vertical slot 134 formed in the rear end of the carriage 7 8. Vith this arrangement and construction of the parts, it will be seen vthat theV length of the feeding stroke will be varied in proportion as the bracket 126 is moved in or out along the ways 128 on the lever 114. In order to maintain the forward limit of movement of the awl constant for any bodying the several features of the invention having been described, what is claimed 1s:

1. A shoe sewing machine having, in combination, sewing devices including a hook needle, a presser foot, a work support, a carriage, parallel links on which the carriage is supported to permit reciprocation thereof in the line of feed, an awl carrier mounted in the carriage for Vertical movement, a rock shaft, connections therefrom for moving the awl carrier vertically, a sleeve on the rock shaft, and connections therefrom for imparting a reciprocating movement to the carriage. Y e

2. A shoe sewing machine having, in combination, sewing devices including a hooked needle, a presser foot, a work support, acarriage mountedto reciprocate in the line of feed, an awl carrier mounted in the carriage for vertical movement, means for actuat ing the awl carrier comprising a rock shaft and an arm on the rock shaft enga-ging the awl carrier, a sleeve on the rock shaft, and connections from the sleeve :for imparting a reciprocating movement to the carriage.

Y 3. A shoe sewing machine having, in combination, devices including a hooked needle, a presser foot, a worksupport, a. carriage, parallel links on which the carriage is supported to permit reciprocation thereof in the line of feed, anawl carrier mounted in the carriage for verticalY movement, means for actuating the awl carrier, a lever for actuatingv the carriage, and a pin Vand slot connectionk between the lever and carriage.

In testimony whereof I have signed my name to this specification.

" OSCAR L. LAWSON# machines, filed June 12, 1929, Serial No. j

The nature and object of the invention r having been indicated, and a machine emizo

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