US731696A - Blindstitch sewing-machine. - Google Patents

Description

BLINDSTITGH SEWING MACHINE.

APPLICATION FILED 001 23. 1902.

N0 MODEL.

wva'v woz John G. Lewis mwN ON a E m mi UNITED STATES} Patented June 23, 190a.

PATENT OFFICE.

JOHN G. LEWIS, OF ST. LOUIS, MISSOURI.

BLINDISTITCH SEWING-MACHINE."

SPECIFICATION forming part of Letters Patent N 0. 731,696, dated June 23,1903.

Application filed October 23, 1992. Serial No. 128,427. on model.)

To all whom it may concern:

Beit known that 1, JOHN G. LEWIS, a citi-l zen of the United States, residing at the city I of St. Louis,in the State of Missouri, have invented a certain new and useful Sewing-Ma chine, of which the following is such a. full, clear, and exact description as will enable any one skilled in the art to which it appertains to parts to recede laterally from the other after a shaft 16.

the point of the needle has entered the goods.

In the accompanying drawings, Figure 1 is a side view, partly in section and partly in elevation, showing a portion of a sewing-machine embodying the preferred form of my invention. Fig. 2 is a section on the line 2 2 of Fig. 1. Fig. 3 is a top plan view of the needle-bar and bearing shown in Fig. 1. Fig. 4 is a top plan View of a portion of the machine embodying a modified form, and Fig. 5 is a detail view of a portion of the mechanism shown in Fig. 4.

Like marks of reference refer to similar parts in the several views of the drawings.

10 is a back guide around which the goods are adapted to be held and which in the preferred form of my invention is preferably made normally stationary.

'11 is a needle-bar carrying a needle 12. The needle12 is mounted in the needle-bar 11 eccentrically, as shown in Fig. 3, and is preferably held in position by means of a setscrew 13. The needle-bar 11 reciprocates longitudinally in bearings 14 and 15, carried by The shaft 16 is preferably arranged to oscillate on its axis, so as to form l tial to my invention.

an overseaming stitch; but this is not essen- In the needle-bar 11 is formed a longitudinal slot or groove 18,

a roller 21, as shown inFig. 2.

having an inclined portion 19. Projecting through the bearing 14 and intothe slot 18 is a screw 20, which ispreferably provided with The needlebar 11 is reciprocated longitudinally by a bar 22, secured to a short collar 23 on the said needle bar 11. The collar 23 is loosely mounted on the needle-bar 11, so as to allow the said needle-bar to rotate, and is prevented from moving longitudinally on the bar by means of fixed collars 24. I

In the operation of my machine the needlebar 11 is moved upwardlybymeans of the bar 22, and as the point of the needle 12 enters the goods folded around the back guide 10 the inclined portion 19 of the slot 18 comes in contact with the roller 21 and causes the needle-bar 11 to rotate through a slight angle on its axis. On account of the eccentric position of the needle 12 it is thrown away from the back guide 10, thus preventing the eularged portion of the needle from striking against the back guide and coming through the goods.

In the modification shown in Fig. 4 the needle 12 is preferably mounted in the center of the needle-bar 11 in the usual manner, and in place of causing the needle to recede from the back guide I cause the back guide to recede from the needle. In this form of my machine the back guide 10 is preferably carried by an arm 26, pivotallymounted at a point 27 to an arm 28 0f the machine.

Mounted on the main shaft 29 of the machine,

which is preferably contained in a housing 30, is a cam 31. In the cam 31 is formed a guideway 32, in which runs a stud or roller 33, carried on a bifurcated arm 34. The bifurcated arm 34 embraces the main shaft at one end, and at the other is pivoted to the arm 26, carrying the back guide 10. In this form of my 7 machine the inclined portion of the guideway 32 comes in contact with the stud or roller 33 as the point -of the needle enters the goods around the back guide, and thus draws the end of the arm 26 toward the housing 30. This causes the back guide 10 to recede from the needle 12 and accomplishes the same result as the mechanism shown in Fig. l.

I am aware that blindstitching-machines have been heretofore made in whichan oscillating former was used to bend leather or longitudinally, and means for causing one of said parts to recede laterally from the other after the point ofthe needle has entered the goods. g

2. In a sewing machine, a back guide around which the goods are adapted to be held, a needle cooperating with said back guide, means for reciprocating said needle longitudinally, and means for causing said needle to recede laterally from said back guide after its point has entered the material.

3. In a sewing machine, a back guide around which the goods are adapted to be held, a needle-bar, a needle mounted eccentrically in said needle-bar and adapted to cooperate with said back guide, and means for rotating said needle-bar to cause said needle to recede laterally from said back guide after its point has entered the material.

4. In a sewing. machine, a back guide around which the goods are adapted to be held, a needle bar, a needle eccentrically mounted in said needle-bar and adapted to cooperate with said back guide, and means for rotating said needle-bar at each stroke to cause said needle to recede laterally from said back guide after its point has entered the material.

5. In a sewing machine, a back guide around which the goods are adapted to be held, a needle-bar carrying a needle eccentrically mounted therein, a guide for said needle-bar, a slot extending longitudinally of said needle-bar and having an inclined portion, and a stud or roller running in said slot and adapted to rotate said needle-bar to throwsaid needle away from said back guide.

In testimony whereof I have hereunto set my hand andaffixed my sealin the presence of two subscribing witnesses.

JOHN G. LEWIS. [L. s.]

Witnesses:

L. B. BEACH, JAMES H. BRYsoN.

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