US737012A

US737012A - Two-needle hemstitch sewing-machine.

Info

Publication number: US737012A
Application number: US10050002A
Authority: US
Inventors: Amandus Johann August Oesterreich
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1902-03-29
Filing date: 1902-03-29
Publication date: 1903-08-25
Anticipated expiration: 1920-08-25

Description

No. 737,012. PATENTED AUG. 25. 190s.

A. J. A. @ASHRAE-10H.

TWO NEEDLE HEMSTITGH SEWING MACHINE. APPLIOATION Plum MAR` zal 1902.

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PATENTED AUG. 25, 1903.

A. J. A. OESVTEREEIGE. Two .NEEDLE EEMSTITGH SEWING MACHINE.

APPLIUATION FILED MAR. 29, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

No. "rancia,

UNITED STATES Patented August 25, 1903.

PATENT OEEICE.

AMANDUS JOHANN AUGUST OESTERREICH, CF HAMBURG, GERMANY, ASSIGNOR TO TI-IEJSINGER MANUFACTURING COMPANY, OF ELIZA BETH, NEW JERSEY.

TWO-NEEDLE HEMSTITCH SEWING-MACHINE.

SPECIFICATION forming partof Letters Patent No. 737,012, dated August 25, 1903.

i Application filed March 29,1902. Serial No. 100,500. (No model.)

To al wiz/0m it may concern/.j

Be it known that I, AMANDUS JOHANN AU- eusr OEsrERRnIor-I, a subject ofthe German Emperor, and a resident of Hamburg, in the German Empire, have invented certain new and useful Improvements in Two Needle Hemstitch Sewing Machines, of which the following is a specification.

In making asimplehemstitch either a oneneedle or a two needle hemstitch sewingmachine is employed and the vertically-reciprocating needle or needles are moved laterally or horizontally to make the proper hemstitch-gures. Vith a one-needle sewingmachine the two tying-seams along the two edges of the hem can, of course, only be made one after the other., whereas with a two-needle sewing machine both tying-seams are made simultaneously, thus doubling the production.

The present invention relates to certain improvements in that class of two needle hemstitch-machines in the operation of which two hemstitch or tying seams are simultaneously formed; and the invention has for its object to provide a two-needle hemstitch-machine of such construction that it is adapted for wider hemstitching than the two-needle hemstitch-machines heretofore in use.

In the accompanying drawings, Figure 1 is a bottom view of a machine embodying the invention. Figs. 2 and 4 are opposite side ele- Vations of the same, partly in vertical section. Fig. 3 is a top view of the machine; Fig. 5, a partial cross-section of the same near the forward end of the work-plate. Fig. 6 is a detail view of the thread-divider, andFig. 7 is a diagrammatic view illustrative of the formation and stitching `of the hem.

Referring to the drawings, 1 denotes the needle-bar, provided at its lower end with a cross-head 2, on which arepivotally mounted needle-carriers 3, to which the needles Ilare secured, the said needle-carriers having a pinand-slot connection with each other and one of them being provided with the upwardlyextending arm 7, to which vibrating move ments are imparted, so as to move the needles toward and from each other horizontally, as denoted by the full and dotted lines in Fig. 2. The arm 7 is vibrated back and forth by the U-shaped lever 5, (see Fig. 3,) fulcrumed in the head of the machine and having a depending arm loosely connected with said arm 7. To the lever 5 is jointed at its forward end a pitman 6, adjustably connected at its rear end to one arm of a bellcrank` lever 9, fulcrumed on a pin 8, and the other arm of said bell-crank lever is provided with a pin or stud entering a camgroove in a cam-cylinder 10, which is geared to the needle-bar-operating shaft in the usual manner.

Cooperating with the vertically and. horizontally reciprocating needles .tare suitable shuttles or loop-takers, mounted in laterallymovable races or boxes 11, so as to be moved alternately to and fro coincidently with the to-and-fro lateral movements of the needles. To this end a connecting-rod 12 is jointed at its forward end to the pitman 6, from which the needles receive their lateral movements, and said rod12 is jointed at its rear end to the upper arm of a bell-crank lever 13, the lower arm of which is joined by' a pitman 14- to a crank-arm V15, with which is connected a two-armed rocking lever 16. The lower arm of the lever 16 is joined by a connecting-rod 17 with one of the shuttle-races or loop-taker boxes 11, and the other arm of said lever is joined in asimilar manner by a connecting rod 18 to the other of the said shuttle-races or loop-taker boxes 11, so that the loop-takers in said boxes will be moved to and fro later- Vally in unison with the laterallymoving needies.

The loop-.taking devices which I prefer to employ in the present machine 'are oscillating shuttles of a well-known Singer type, and said shuttles are operated from a rockshaft 19, to which oscillating movements are imparted in a Well-known manner from a rocker 22, receiving its movements in the usual manner from the rotating needle-baroperating shaft mounted in the upper part of the bracket-arm of the machine.

Between the shuttle-races or loop-taker boxes 11 is mounted a relatively broad threaddivider 23, attached to a carrier 24, secured to a vertically-reciprocating block 25,` pro ICO vided with a'pin 26, embraced by the fork at the forward end 27 of a lever 28, fulcrumed on the screw29 and connected at its rear end by a pitman 30 with a crank-arm 3l, attached to a rock-shaft 32, provided with an arm 33, arranged to be engaged at times by a pin 3l on the cam-cylinder l0 when the said threaddivider is to be moved downward at the intervals when the work is to be fed, the upward movements of the said thread-divider being imparted thereto from the spring 37, connected to the arm 3l and to a stationary part of the machine.

The feeding mechanism of the present machine is or may be of a well-known hemstitch type and in whichonly one forward feeding movement of the work will occur to three vertical reciprocations of the needles. The feed-dog of the present machine and part of its operating mechanism have been omitted from the drawings for clearness of illustration; but the said feed-dog may be operated in the usual manner through rock-shafts beneath the work-plate, the rock-shaft 36, operated by the rod 35, connected with the lever 33, serving to impart vertical movements to the said feed-dog and a second rockshaft, operated by a rod 2l, connected with the lever 20, serving to impart feeding movements to said feed-dog.

The operation of the machine is as follows: When the machine is stopped, the thread-divider 23, which is arranged between the needles 4:, should be below the work, and the needles, which are reciprocated vertically in the usual manner from the rotating needle-bar shaft, should be in their raised positions. The work being placed beneath the presserfoot (not shown) and the machine being started, the thread-divider is first pushed up' ward between the threads of the fabric from below, and the needles in their first descent willbe intheinner positions, (denoted by dotted lines in Fig. 2,) so as to pass downward in the needle-grooves (shown in Fig. 6) at the edges of the broad thread-divider. During their second descent the needles will occupy the outer positions (denoted by full lines in Fig. 2) and the loop-takers, following the lateral movements of the needles, will be correspondingly moved outward by the mechanism hereinbefore described and which is connected with the mechanism which moves the needles horizontally orlaterally. At their third descent the needles will occupy the inner positions, (denoted by dotted lines in Fig. 2,) these three descents of the needles completing the hemstitch-figure, and after this has been completed the thread-divider will be lowered and the work will. be fed forward for the next hemstitch-figure.

The formation of the hemstitch-seams is diagrammatically illustrated by Fig. 7, at one side of which are lettered the three stitches d b c of the zigzag hemstitch-gure, and a b o represent another zigzag hemstitchfigure, these :figures being joined by tying a stitch .c a' and the last figure being joined to the next succeeding hemstitch-figure by a tyingstitch c a2.

With many hemstitch-machines now in use and in which the loop-taking devices are not moved laterally withV the needles only comparatively narrow hemstitch seams can be formed, for the reason that if lateral movements of greater extent be imparted to the needles the latter will be so much out of time from the loop-taking devices that the looptakers will be liable to miss the needle-loops, and thus imperfect Work will result; but in the present improved machine, in which the loop-taking devices are moved laterally with the needles, very wide hemstitch-seams may be formed, as no such danger of skipping stitches will arise.

The present invention contemplates forming hemstitch-seams of different widths by providing interchangeable thread-dividers of different widths and by mounting the needles to correspond. Also the extent of the depth stitches of the zigzag hemstitch-seams at the opposite sides of the open-work seams may be varied by varying the point of connection of the rear end of the pitman 6 with the lever 9, which is slotted for such adjustment, and such adjustment will likewise in the present improved machine vary the lateral movements of the shuttle-race or loop-taker boxes 11, which are operated to move toward and from each other from the same part (the lever 9) from which the needles receive their lateral movements, so that one adjustment will provide for a variation of the lateral movements of the needles and of the looptaking devices cooperating therewith.

The invention is not to be understood as being limited to the details of construction or to the particular form of sewing-machine herein shown and described, but may be varied widely without departing from the spirit thereof.

Having thus described my invention, I claim and desire to secure by Letters Patentn,

l. In a hemstitch sewing-machine, a stitchforming mechanism comprising two needles and mechanism for imparting lateral to-andfro movements thereto, of a thread-divider located between the vertical paths of said needles, two loop-taking devices coperating with said needles, and means, operated from the mechanism which imparts lateral movements to the needles, forimparting toand-fro lateral movements, corresponding to the lateral` movements of the said needles, to the said loop-taking devices, and adjusting means whereby the lateral throws of the needles and of the loop-taking devices may be sim ul-taneousl y varied.

2. In ahemstitch sewing-machine, the combination with two needles and two coperating loop-taking devices, of operating mechanism therefor, comprising means for moving said needles and loop-taking devices to- IIO IZO

Ward and from each other laterally, and a needles descend for the first stitch of a hemthread-divider located below the Work-plate of the machine between said loop-taking devices and also between the Vertical `paths of said needles, and mechanism for reciprocating said thread-divider vertically, said operating mechanism being constructed and timed to lift said thread-divider before the stitch-figure and to hold the same in a raised 1o position during the formation of the stitches of a hemstitoh-gure.

AMANDUS JOHANN AUGUST OESTERREICII. Witnesses:

E. H. L. MUMMENHOFF, T. CHRIST. HAFERMANN.