US1704881A - Thread-drawing machine - Google Patents

Description

March 12, 1929. H. CORRALL ET AL THREAD DRAWING MACHINE Filed Aug. 26, 1926 3 Sheets-Sheet l March 12, 1929. H, CORRALL ET AL THREAD DRAWING MACHINE Filed Aug. 26, 1926 5 Sheets-Sheet 2 March 12, 1929. H. CORRALL ET AL 1,704,881

THREAD DRAWI NG MACHINE Filed Aug. 26, 1926 {S Sheets-Sheet 5 fl lilll I I IIIIIIIIIIIII/III. l 5' 21 I// c Patented Mar. 12, 1929.

UNITED STATES; ParseroFFic-E.'

HERBERT 60mm, or imam-sewa e, Y Ma James steam," or cmnnnami; seer LAND, Assr'enons so see snvena' MANUFACTURING COMPANY,- or ELIZABETH, New JERSEY, A colironrl'rron or new JERSEY. w

THREAD-DRAWING. MACHINE.

Amman filed August 26, 1926, Serial at. 131,662, and in Great Britain September 22, 1925.

This invention relates to improvements in machines for drawing threadsin fabrics to be hemstitched. I

'A machine for this purpose comprises a frame which may be constructed as a sewing machine frame iitted with operatively connected upper and "lower rotary shafts, fabricfeeding mechanism including a feed-dog,

a presser-bar with presser-feot, a vertically reciprocatingpiercer-bar carrying a spear} like piercer with a serrated edge,adapted to penetrate slots in the pressei feet and in the.

threat-plate transverse tothe .lineof the feed,

and a rotary cutter carried. by thelowe'r ro tary shaft and havmga cutting edge CllSPOSECl transversely of the direction of feed.

In accordance with the invention there is mounted for vertical reciprocation in the head of the arm of the frame, intermediate the piercer bar andthe presser bar, a bar carrying a pair of flat fabric-depressing fingers with rounded lower edges, one on each side of the piercer, in line Withthe pivots of the presser-feet, these fingers being adapted to penetrate slots in the presser-feet and to enter slots in the throat-plate extending in the direction of feed' i 7 This intermediate bar may be conveniently operated from a rock-shaft mounted in the head and deriving its actuation from an eccentric on the upper shaft, said rock-shaft having an arm disengagably connectible with the intermediate bar, the arrangement being such that in their descent the fingers engage the fabric at about the same time as the piercer, and, travelling aless distance, depress the fabric in the slots in the throat-plate, reaching the lower limit of their stroke at about the same time as the piercer, and releasing the fabric in their ascent to permit the feeding movement following the Withdrawal of the piercer.

The action of the fingers is thus to stretch laterally the fabric clamped between the beneath the throat-plate, and these threads being 7 thereupon severed.

The invention is illustrated in the accompanying drawings in which" Fig.1 is an end ele'vationof the head of the upper armwith the usual coverrplate' removed, showing also the rotary cutter and feed-actuating mechw. msm.' Flg. 2 1s a front sideelevation, part verticalsection showing, the operating parts adjacent to the head. Figs. 3 arias are detail views of connections for operajting the finger-carrying bar. Figs. 5 an'dfi are de tail views of the fabric depressing fingers.

Fig. is a plan of the. throat-plate, below which is the feed-dog, Fig; 8 is a plan of the feed-dog. Fig. 9 is aview ofthe lower end of the press er-bar'with presserfee't, the lati Fig;

ter being tilted to show the slots ther 10 is a part side elevationpart section th oug'h the machine frame showing the connections between the upper drivin I er shafts. Fig. 11 is an inverted planpf the complete machine. Fig. is .a tffttllSVG s' vertical sectionin the plane of the pier c 1 -bar and Fig. 13' is a section Fig. 3.

on the line 18 -18,

a The mac-line illustrated o passes frame:

constructed as swing machine frame with" an upper rotary driving shaft 1 operatively connected to a lower rotary shaft 2 and to a feed rock-shaft 8 and a feed-lift rock-shaft 4. Mounted in the head 5 of the arm 6 of the frame is a presser bar 7 urged downwardly by a spring 8 and carrying twin presser- feet 9, 10, in parallel adapted to tilt on horizontal axes transverse to thelines of feed, the shanks of said presser-feet being connected for reciprocal vertical movements by a balance member 10" journaled on a block 10 at the lower end of the presser-bar 7. The upper rotary shaft 1 is connected by a crank 11 and.

link 12 with a vertically reciprocating bar 13' located in front of the presser-bar 7 as seen by the operator. Clamped to the lower end of the bar 13 by a screw 14 is a spear-like piercer 15 having a serrated edge and adapted to penetrate registering slots 16 in the presserfeet 9, 10, and a slot 17 in the throat-plate '18 transverse to the line of the feed. The lower rotary shaft 2 carries a rotary cutter-blade 19 having a cutting edge disposed transversely of the direction of feed and cooperative with an edge 20 on the under side of the throatplate 18. i

' resser-bar 7 is a bar 21 carryinga pair of flat fabric-depressing fingers 22 with rounded lower edges, one on each side of the piercer 15, in the line joining the pivots 23 of the Presser-feet, these fingers 22 being adapted to penetrate slots 24 inthe press'er-feet and to enter slots 25 in the throat-plate 18 parallel with the feed-slots therein.

The bar 21 is disengageably connected by an arm 27 with a rock-shaft 28 mounted in the head and deriving its actuation through a bifurcated arm-28 from an eccentric 29 on the upper shaft 1,, the arrangement being such that in their descent the fingers 22 may engage the fabric at about the same timeas the piercer 15, and, travelling a less distance, depress the fabric in the slots 25 in the throatplate 18, reaching the lower limit of their stroke at about the same time as the piercer 15, and releasing the fabric in their ascent to permit the feeding movement following the withdrawal of the piercer.

The action of the fingers 22 is thus to stretch laterally the fabric clamped between the presser-feet 9, and the throat-plate 18 and to be acted on by the piercer and fed by the feed-dog 30. v V

The feed-dog 30 presents parallel series of serrations, comprising two outer series 31, 82,

' one outside of each. finger 22, adapted to project through elongated feed-slots 33 in the throat-plate 18, each extending from a point in front to a point behind the path of the piercer 15, and two short series of serrations :34, 35 located between'the fingers 22 and adapted to p Dject through intdrmediate feed-slots 36 in the throat-plate 18 extending rearwardly from points behind the path of the piercer. i

As is understood, in the continued oper-, ation of the machine, the piercer 15 makes a line of spaced penetrations in the fabric the serrated edge pushing the threads to be drawn'beneath the throat-plate 18 for severance by the cutter 19 in rotation of the lower shaft 2. t

Having thus set forth the nature of the invention, what we claim herein is 1. A thread-drawing machine having a throat-plate, a presser-bar and a vertically reciprocatory piercer-bar above the throatplate, a piercer carried by said pier cer-bar, vertically movable fabric-depressing fingers, one on each side of'said piercer, pressermeans carried by said presser-bar and formed with slots for said piercer and fabric-depressing fingers, said throat-plate also having slots for said piercer and fingers, a feeding device and rotary cutter below the throatplate, and means for reciprocating said lingers to project them through the slots in the presser-means and'into the slots in the throatplate. 7

2. The combination set forth in claim 1 in which the finger actuating mechanism is timed to'move the fingers into engagement with the work concomitantly with the piercer, and thereafter to move the fingers a lesser distance than the piercer is moved.

In. testimony whereof, we have signed our names to this specification.

HERBERT CORRALL. JAMES HEGGIE.

Images