US846065A - Trimming device for sewing-machines. - Google Patents

Description

110.840,0'65. Y f EATENTED MAE. 5, 1907.

Y W. HfsTEDMAN.

TEIMMING DEVICE EOE sEWmG MACHINES.

A4311110001111011 FILED MAY 15.1902.

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' l W. H. STBDMAN. f TRIMMING DEVICE FOR SEWING MACHINES.

APPLICATION FILED YMAY l5, 1902.

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UNITED STATES PATENT OFFIOE.

WILLIAM H. STEDMAN, OF HARTFORD, CONNECTICUT, ASSIGN OR TO THE MERROW MACHINE COMPANY, OF HARTFORD, CONNECTICUT, A COR- PORATION OF CONNECTICUT.

TRIMIVIING DEVICE FOR SEWING-MACHINES.

ivo. 846,065.

.Specification of Letters Patent.

Patented March 5, 1907.

Application filed May 15,1902. Serial No. 107,508.

` To all whom t may concern;

Be it known that I, WILLIAM H. STEDMAN, a citizen of the United States, residing in the city and county of Hartford, State of Connecticut, have invented certainnew and useful Improvements in Trimming Devices for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the igures and letters of reference marked thereon.

This invention relates more particularly to the trimming mechanism, and consists in certain novel details of construction and combinations and arrangements of parts, all as will be hereinafter described, and pointed out particularly in the appended claims.

For a complete illustration and description of the type of machines with which these devices are especially adapted to be associated reference may be had to United States Patents No. 414,718 and No. 591,049.

The various elements of this invention have been contrived and arranged especially for use in machines of the type herein illustrated and described and which contain a lower and upper shaft geared together and cams on either of said shafts to actuate the loo ing devices located adjacent to the needle.

n the drawings, Figure 1 -is a front elevation of a machine to which the trimming mechanism is shown as applied. Fig. 2 is an end elevation of said machine with portions removed to better disclose the trimming mechanism. Fig. 3 is a rear elevation of a portion of the trimming mechanism detached from the machine. Fig. 4 is a plan view of the needle-plate. Fig. 5 is an end elevation of the stitch forming and trimming mechanisms with the machine-frame indicated in dotted lines to show their disposition with relation thereto. Fig. 6 shows the stitch-V forming mechanism in front elevation and a portion of the trimming mechanism partly in front elevation and partly in section. Fig. 7 is a view, largely in section, illustrating the manner in which the looper and loop-carrier su ports are supported and driven.

eferring to the drawings, the number 1 0 denotes the frame or casing, and 11 the head of the machine.

The main shaft is denoted by the number 12 and its driving-pulley by the number 13. A second shaft 14 is provided, located above and extending parallel with the main shaft lengthwise of the machine, and the said shafts, respectively, carry within the frame cam-cylinders 12a 14a, having intermeshing gears 12b 14b thereon, whereby the said shafts and cam-cylinders are caused to rotate in unison. The cam-cylinders 12a 14a are provided with suitable cam-grooves for actuating certain elements of the stitch-forming mechanism of the machine.

The number 10a denotes a cover, which serves to close an opening in the frame 10, through which the interior of the machine may be reached. The shaft 12 projects through the end wall of the casing at the opposite end from its driving-pulley 13 and bears an eccentric 15 and a cam 15a, forming a part of the feeding mechanism of the machine. The shaft 14 also projects through the said end wall of the casing and bears a wrist-pin 16, connected by a link 16a with the needle-carrier 16h, the latter being pivotally secured to the end wall of the frame. T he needle'lC is mounted in the carrier 1Gb and through the described train of mechanism is reciprocated in a path concentric with the pivotal support of the needle-carrier.

One or more stitch-forming implements auxiliary to the needle coperates with the latter, being actuated by cam-grooves in the cam-cylinders 12:L 14a, the machine shown in the drawings illustrating stitchforming mechanism corresponding in general to that of the Patent 591,049 above mentioned. The reference-numerals 12C 14C denote the said cam-grooves in the camcylinders 12a 14a, and the said grooves are adapted to receive cam-rolls 12d, mounted upon pins'12e, attached to the carrier 14d, and the latter is pivotally supported on a pin 14e on the sliding block 14f, arranged to slide longitudinally between the beveled gibs 10C 1()cl on the door 10a. The looper 17c and the loop-carrier 18c are secured, respectively, to the carrier 14d and the sliding block 14f. Upon the rotation of the cam-cylinders the said looper and loop-carrier are adapted to travel and coperate with each other and with the needle in the manner fully eX- plained in the said Patent 591,049.

The feeding mechanism already mentioned is of the character commonly provided in this class of machines and includes the feedcarrier 17, so supported at its rear end as to permit of the usual vertical and horizontal motions of the feed-dog 17 a, (the forward portion of which is broken away in the Fig. 2 to avoid complication,) the teeth or serrations of the said feed-dog being adapted to project through suitable openings in the needle-plate 1S in the usual manner. Near its forward end the `feed-carrier is engaged by the cam 15, which imparts vertical motion to the said carrier, while the eccentric 15 through the medium of its strap 15b, connecting with the feed-carrier, effects the horizontal motions of the latter. The needleplate 13 already mentioned is supported by a bracket 19, secured to the cover 10, The presser-foot 20 is supported in the head 11 and is adapted to coact with the feed-dog in the usual manner to assist the latter in feeding the material over the needle-plate 1S.

The machine shown in the drawings and those of the patents referred to are commonly designated loverseaming-machines,7 because of the character of the work which they produce.

In carrying out the trimming operation in connection with overseam-sewing it is usual to perform the said operation upon the fabric just in advance of the point or points of cooperation between the needle and the looper or loopers or other implements auxiliary to the needle and somewhat to one side of the point at which the needle penetrates the fabric. This is done in order that a trimmed clean-cut edge of the fabric may be provided around which the overseam-stitches shall be formed, and it will be seen from the Figs. 4 and 5 of the drawings that the newly-invented trimming mechanism is so arranged that the point where the trimming is done and the point where the stitch is formed occupy positions relatively to each other corresponding with those just recited.

Referring now to the trimming mechanism, the same includes a vibrating and a stationary knife. known form and are indicated in the drawings by the reference-numbers 21 22, respectively. The upper knife 21 is carried at the end of a vibrating arm 23, to which it is secured by a bolt 21, while the knife 22 is supported in a stand 24, adjustably secured to the base 10b of the frame 10. rlhe vibrating arm 23 partly encircles the upper portion of the casing and the cam-cylinder 14'LL in order that it may reach a pivotal point in the rear of the machine substantially in the same hori- Zontal plane in which the trimming-knives operate. At said point the arm 23 is pivotally supported in a bracket 25, the pivot being formed by a rod 25a, and the said bracket is in turn adjustably secured to the back side The knives are of a well-l of the casing by screws 26, the holes 26a for which are somewhat elongated, as shown. At the front of the machine the cover 10a and the frame 1() are cut away, as at 10C, to protion of the frame and being pivotally connected to the arm 23 by a pin 27b with sufficient play to allow for a slight adjustment of the bracket 25 and the said arm 23. Upon the rotation of the shaft 14 the eccentric 27, through its strap and rod 27 a, imparts vibratory motion to the arm 23, as will be very readily understood from the drawings. The lower knife 22 is secured to its stand 24 by a bolt 2S, and the said stand is in turn secured to the base 10b by screws 29, the holes 30 for which in the stand are somewhat elongated, as shown in dotted lines in the Fig. 1, to permit of a slight adjustment of the stand corresponding with the provision for adjustment made in connection with the bracket 25 in order that the knives may be positioned for operation at any point within the range of such adjustment and in order that they may be adjusted with reference to each other to insure proper cutting contact between them. lhen the machine is in operation, the material to be trimmed is carried forward to the knives, as is common in sewing-machines, by the feeding mechanism already described, and the said knives operate to e'i'i'ect the trimming, as usual.

The reference-number 31 denotes a defisctor secured to the arm 23 in the rear of the knife 21 and serving to prevent the forward travel of the trimmed-oill portions of the material with the body of the work and also serving to force the trimmings or clippings downward to effect their discharge. To assist in conducting the trimmings or clippings from the machine, a chute 32, of sheet metal or other suitable material, is located beneath the plane of the trimming operation. The chute 32 is bent outward or away from the front face of the frame of the machine, providing a space for the passage of the thread 33, the chute thus covering and protecting the said thread from contact with the trimmings or other possible disturbance. The said thread leads back of the chute and into the tubular passage 37, through which it renders into the machine and to its looper 18C, as best shown in Fig. 5. i

rlhe mechanism shown in the drawings has been contrived and arranged with special reference to convenience in operating upon small tubular work, whereby such goods as the cu'Hs of sleeves and the tops of stockings IOO can be more rapidly and conveniently finished by trimming and overseaming the edges simultaneously. To this end the needle-plate is made comparatively small and is so constructed and supported that at its front, rear, and outer edges, where the work is handled by the operator and fed into and out of the machine, there is no encumbrance or obstruction, (see Fig. 4,) the arrangement permitting tubular work to be fed into the niachine and to be simultaneously trimmed and overseamed with unusual. facility and with little or no stretching or disarranging of the cuils or similar articles.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent, is-

1. The combination with a sewing-inachine embodying a frame constituting a casing 'for the driving mechanism, a needle-plate at one end of the casing a stitch-forming mechanism embodying a needle-carrier, connections between the needle-carrier and driving mechanism located at the end of the casing, a trimmer-carrying arm pivotally mounted on the frame in rear of the casing and at one side of the line of work-feed, said arm being curved up over the casing and stitch forming and driving mechanisms, a trimmer carried by the forward end of the arm and a connection between the arm and driving` mechanism passing in through the top of the casing substantially as described.

2. In a sewing-machine, the combination with the frame constituting a casing, a needle-plate at one end of the casing, a driveshaft j ournaled in the casing and projecting at one end from the casing above the level of the needle-plate, a trimmer-carrier pivoted to the casing at approximately the level of' the needle-plate and extending over the drive-shaft into proximity to the needleplate, a trimmer on said carrier, a stitchforming mechanism embo'dying a needle-carrier and upwardly and downwardly extending driving connections between the shaft and trimmer and needle carriers respectively.

ILLIA/l H. STEDMAN.

itnesses MoR'roN C. TALooTr, ALONZO M. LUTHER.

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