US1283471A - Sewing-machine. - Google Patents

Description

I H. CORRALL. SEWING MACHINE.

APPLICATION FILED IAN. 30,1917.

Patented Nov. 5, 1918,

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HERBERT COR/BALL, 0F HELENSBURGH, SCOTLAND, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Nov. 5, 1913.

Application filed January 30, 1917. Serial No. 145,354.

To all whom it may concern:

Be it known that I, HERBERT OORRALL, a subject of the King of the United Kingdom of Great Britain and Ireland, and residing at Parkview, Helensburgh, Dumbartonshire, Scotland, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an improved presser mechanism for sewing and embroidering machines comprising a minimum number of parts which, while controlling the material during the formation of the stitch, will afford suflicient freedom for movement of the material while the needle is out of the work, and will also insure silent running besides being little subject to wear by reason of the elimination of shocks.

As in the case of the presser mechanism described in my United States patent application Serial No. 63,101, filed November 23, 1915, the presser is held clear of the work during the major portion of each stitchforining cycle, and is lowered so as to re main in contact with the work during'the period requisite for the proper formation of the stitch.

Figures 1 and 2 of the accompanying drawings are elevat1ons at right angles to one another showing a preferred construction and arrangement of presser-lnechanism according to the invention. Fig. 3 illus trates an alternative construction.

Referring to the drawings, 1 designates the throat-plate or work-support of a sewing machine provided with the usual overhanging bracket-arm 2 in which is journaled an actuating shaft 3 carrying at its forward end the usual take-up and needle-bar actuating cam t as is well known in sewing machine constructions.

Mounted for. reciprocatory movement in the bracket-arm 2 is the needle-bar 5 carrying the collar 6 having the usual link connection 7 with an eccentric stud 8 carried by the cam 4.

The stud 8 is provided with a crank-arm 9 carrying at its free end a roller-stud 10 adapted to enter the slot 11 of the extension 12 of the block 13 fitted to slide upon the hollow presser-bar 14 between collars l5 and 16 adjustably clamped thereon respectively above and below the block 13. Interposed between the collar 16 and the block 13 is a helical spring 17 and a similar spring 17, may also be interposed between the block 13 and the collar 15 as illustrated in the modification shown in Fig. 3. Carried by the lower end of the presser-bar 11 is the usual resser-foot 18, cooperating with the arched portion 19 of the work-support 1 in the clamping of the material during the stitclrsetting operation.

As the needle-bar receives reciprocatory movements through its connection with the eccentric stud 8, the crank-arm 9 imparts, by engagement of the roller-stud 10 with the extension 12 of the block 13, and the latters yielding connection with the block 16, a like movement to the presser-bar 14: insuring the Contact of the presser-foot 18 with the material during the descent of the needle and the formation of a stitch. After the stitch has been set and the needle has begun to recede from the material, the block 13 engages the collar 15 and thereby lifts the presser-bar 14 with its foot 18 affording freedom for movement of the material while the needle is out of the latter. By interposing cushion spring 17 between the block 13 and the collar 15, a yielding connection is formed between the presser-bar 1 1 and the block 13.

As represented in the drawing, the presser-bar 11 is preferably hollow to receive a piercer-bar 20 provided at its lower end with a piercer 21 adapted to puncture the material being stitched or embroidered. The upper end of the pierccr-bar is slotted at 22 to receive one arm of a bell-crank 23 journaled upon a bearing stud 2 1 carried by the free end of the supporting-arm 25 rigidly secured to the bracket-arm 2 of the sewing machine. The lower wall of the slot 22 is slightly rounded at 26 where it contacts with the arm of the bell-crank lever 23 which is loosely confined against upward movement therein by a cross-pin 27 passing through the upper portion of the piercer-bar 20 which is normally retained in raised position and does not participate with the reciprocating movements of the presserbar 14.

In the adaptation of the invention to a group of embroidering machines, as more fully described and illustrated in the United States patent to Herbert Cori-all and James M. Forbes, No. 1,159,901, 01 November 9, 1915, the piercer-bar 20 is operated by the rocking movement of bell-crank levers 23 each mounted upon its respective machine of a group and operatively connected bymeans of a clamp-head 28 to a rod 29 adjacent the forward portion of the series of bracketarms within convenient reach of the operator so that all piercers of a group'of ma chines are operated simultaneously.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, in combination, a presser-bar, a block slidable on said bar, a collar fixed to said bar below said block, a spring interposed between said block and said collar, a needle-bar, actuating means therefor, and a direct connection between said actuating means and said block for transmitting positive reciprocatory movements to said presser-bar,

2. In a sewing machine, in combination, a presser-bar, a block slidable on said bar and provided with a slot, a collar fixed to said bar below said block, a spring interposed between said block and said collar, a needleban; an actuating shaft, and an eccentric stud ope 'atively connected with said shaft and providedwith an arm having a roller entering the slot in the slidable block for transmitting reciprocatory, movements to said presser-baiz,

llntestiinony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

' HERBERT OORRALL.

Witnesses VVALLAOE CRANSTON F AIRWEATI-IER, HENRY MASON;

Copies of this patent may-be obtained for five'cents each, by addressing the Gommissioner of Patents- Washington, D. G.

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