US971140A - Crank hemstitch embroidering-machine. - Google Patents

Description

. D. NOBLE. CRANK HEMSTITUH EMBROIDEVRING MACHINE. APPLICATION FILED NOV. 19, 1908.

971, 140. Patentd Sept 27, 1910.

IIVVENTOR DONALD NOBLE BVEJk/QW ATTORNEY WITIVESSES llNlTED TATEE PATENT OFFXQE.

DONALD NOBLE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE SINGER IVIANU- FACTURING COMPANY, OF ELIZABETHPORT, NEW JERSEY, A CORPORATION OF NEW JERSEY.

CRANK HEP/ STITCH EMBROIDERING-MACHINE.

To all whom it may concern:

Be it known that I, DONALD NOBLE, a subject of the King of Great Britain, residing at Bridgeport, in the county of F airfield and State of Connecticut, have invented certain new and useful Improvements in Crank Hemstitch Embroidering-Machines, of which the following is a specification, reference being had therein to the accompanying drawlngs.

This invention relates to improvements in what are commercially termed crank hemstitch embroidering machines wherein two needles are employed and the material is fed in any desired direction by means of a feeding mechanism operatively connected with a crank which is mounted so that it may be conveniently manipulated.

The primary object of my invention is to substitute automatically controlled means for the heretofore manually controlled means for determining the position of the stitching at the point where the open-work seam is directed at an angle to the previously formed stitches.

I have shown my invention as applied to the crank hemstitch embroidering machine forming the subject matter of my U. S. patent application Serial No. 401,644; filed November 11, 1907, to which reference may be had for a detailed description of the mechanism for rotating the needles and piercer, and therefore I have herein described only so much of such mechanism as I have deemed necessary for a proper understanding of my present invention.

One of the difficulties encountered in the manual manipulation of crank hemstitch embroidering machines of the earlier forms of construction has been to properly position the stitches at the point where the openwort seam is directed at an angle to the stitches previously formed. Previous to my invention it has been the common practice to arrange the needles and piercer in a line corresponding to the diameter of the rotating cylinder within which the needle-bar is mounted to move vertically and, accordingly, when the cylinder is rotated to form an open-Work scam in a direction transverse or tangent to the previously formed stitches, the next subsequently formed stitches will be placed midway between the two individual lines of hemstitching, thus eflecting Specification of Letters Patent.

Application filed November 19, 1908.

Patented Sept. as, rare, Serial No. 463,346.

an undesirable corner; and to remedy this dilliculty it has been necessary for the operator to bring the machine to rest, releasethe material by raising the cloth-presser, and manually adjust the material so that the first descent of the needles and piercer will be in line with the row of individual hemstitches forming the right hand seam of the previously formed open-work seam, if it were desired to direct the stitching to the left, and in line with the oppositely formed row of stitches if it were desired to direct the stitching to the right.

To overcome the necessity of manually manipulating the material when changing the direction of the open-work seam, I mount the needles and piercer in a line parallel with but slightly at one side of a line corresponding to the diameter of the ro tating cylinder, such distance being represented by substantially one-half the distance between the needle points when they are extended to form the outer lines of needle punctures in the formation of the open-work seam, thus automatically carrying the needles and piercer to their proper positions for the commencement of the newly directed open-work seam. In other words, the laterally movable needles and the intermediate piercer are, according to the present improvement, arranged in a line transverse to and offset from the axis of rotation of the cylinder from which they derive their rotary movements.

Referring to the accompanying drawings, in the several figures of which like parts are similarly designated, Figure 1 is a view in elevation of a portion of the arm standard, and a portion of the overhanging arm together with the parts carried thereby, the needles and piercer being arranged in a line parallel with but slightly distant from a line corresponding to the diameter of the rotating cylinder carrying the vertically actuated needle-bar, the axis of said needlebar corresponding with the axis of said cylinder. Fig. 2 is a view in perspective of certain parts, hereinafter to be referred to, which are mounted in said cylinder and rotatable therewith, together with the step foot. Fig. 3 is an enlarged diagrammatic view of a double hemstich open-work seam such as is produced by the machine of the present application, illustrating the formation of the stitches at the point where the seam turns in a direction transverse to the previously formed stitches. Fig. i is a view similar to Fig. 3, except that it illustrates the relative positions of the stitches when forming a corner as they are placed by the earlier forms of construction when the material is not manipulated by hand to place it in its proper position relatively to the needles and piercer.

1 is the lower or base portion of the arm standard, and 2 a hanger which projects downwardly from and forms apart of the overhanging arm 3.

4c is a downwardly extended portion secured in the hanger 2 by a suitable screw (not shown), and 5 is the cloth-presser bar which is mounted in the tubular portion i and carries the cloth-presser 6.

7 is a half bearing cap secured by screws 8, S to the lower portion of the overhanging arm and in which the lower end of the cylinder 9 is rotatably mounted.

10 is a short cylinder secured by screws 11, 11 to the lower end of the cylinder 9.

12 is the feeder-head, and 13 a lug which extends downwardly from a two-arm lever 12 and enters an opening 13 in the feederhead 12.

1 1 is a bracket secured by a suitable screw (not shown) threaded into an opening 15 in the head 12, and 16 is a spring which is seated at one end in the bracket let, its opposite end being seated in a suitable pocket (not shown) formed in the short cylinder 10.

17 is a screw, the inner end of which coacts with the lug 13, said screw being adjust-ably secured by a nut 18.

The needle-bar 19 carries at its lower end a plate 20 which is of inverted T-shape, the longer arm 21 of which is secured by a suitable screw 22 in a slot 23 formed in the lower end of the needle-bar, and to the arms 25 and 26 of the plate 20 are secured, by pivot screws 27 and 28, the needle carrying levers 29 and 30 in which the needles 31 and 32 respectively are secured by the commonly employed needle set screws (not shown).

33 and 34: represent the needle vibrating levers which are independently pivoted upon complemental stud screws 35, said screws being threaded into suit-able lugs 36 (one only of which is shown) forming a part of the feeder-head 12, the upper ends of the levers 33 and 3% being provided with their respective rollers 37 and 38. The levers and 3a at their lower ends carry the respective studs 39 and 40, and upon the stud 39 is mounted a rocking block ell, the stud 40 carrying a like block 42, said blocks being provided with the respective openings -.t3 and a l through which pass the respective rods 45 and 4:6. The lower end of the rod 45 is secured in the needle carrier 29 and the lower end of the rod 16 is secured in the carrier 30, said rods passing through suitable openings in the studs 39 and 40.

at? and 48 are inclines which are formed on the needle cam shaft a9 and coact with the respective rollers 37 and 38 to rock the needles automatically in opposition to the resiliency of the spring 50, said spring through its act-ion upon the oppositely arranged blocks 11 and 42 acting to hold the needles adjusted to their innermost positions or their positions for entering the opening in the material formed by the piercer 51.

52 is the step foot which is formed integral with the pinch collar and secured by a pinch screw 5st to the lower end of the rod said rod extending up into the hollow portion 56 of the piercer-bar 57 in opposition to the resiliency of the spring 58. To the lower end of the piercer-bar 57 is secured by a screw 59 a pinch collar 60 having a downwardly extended portion 61 in which is secured by a suitable screw, as 62, the piercer 51.

The vertical axis of the needle-bar and rotating cylinder is represented by the dotted line, X, K, Fig. 1, and it will be observed that the vertical plane embracing the center lines of the needles and piercer is slightly offset rearward of the line :0 a; in relation to the direction of feed. It is to be understood, however, that the side of the line a on which this offset occurs is not material, the object being to insure the bodily lateral movement of the needles and piercer with each turning movement of the rotary carrying cylinder 9.

All of the parts herein referred to are the same in construction and operation as the corresponding parts illustrated and described in my pending application previously referred to, except that the needles 31 and are arranged, as before stated, at one side of and parallel with a line correspond ing to the diameter of the rotating cylinder '9 and, in the present instance, a line corresponding to the diameter of the needle-bar.

It will be readily understood that the most important feature in construction involved in the present invention is the arrangement of the needles and piercer as herein pointed out, whether accomplished by the means herein disclosed or by mounting the needlebar slightly out of line with the vertical axis of said cylinder.

While the employment of a piercer and piercer carrying bar is important in effecting an opeirwork seam, their use is not essential for all classes of productions and, accordingly, I do not wish to be understood as limiting myself to the particular class of hemstitch embroidering machines herein referred to.

The operation of my improved mechanism is as follows: Referring-to Fig. a, supposing the arrows Z to indicate the direction of the formation of the open-work seams, it the needles and piercer are secured in a line corresponding to the diameter of the cylinder 9 and the stitches a and b have been formed, and it is desired to form the openwork seam in directions transverse to each other, the two stitches first placed at the point of changing the direction of the line of stitching Would be those indicated by 0 and d, leaving an unfinished corner represented by dotted lines 6, 6, but if the needles and piercer are positioned in a line slightly distant from the line corresponding to the diameter of the cylinder 9, the stitches would be placed as indicated by a, b, 0 and d, Fig. 3, thus connecting the two open-work seams so as to produce a square corner.

What I claim is 1. In a crank-hemstitch ei'nbro-idering machine, a. rotary cylinder mounted in the overhanging arm, a needle-bar mounted in said cylinder and movable vertically therein and rotatable therewith, and laterally movable holders carried by said needle-bar and provided with needles arranged in a line transverse to and offset from the axis of rotation of said cylinder.

In a crank-hemstitch embroidering maarranged in a line transverse to and offset from the axis of rotation of said cylinder, and a vertically movable piercer-bar carried by said cylinder and provided with a piercer arranged intermediate to and in line with said needles.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

DONALD NOBLE. Witnesses:

A. M. DONIHEE, J S. FINoH.

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