US1650306A - Overedge-looper mechanism for sewing machines - Google Patents

Description

Nov. 22, 1927.

S. G. TATE OVEREDGE LOOPER MECHANISM FOR SEWING MACHINES Filed July 18, 1924 2 Sheets-Sheet 2 & Q Q

v QWW 6 sewing machine.

on a fixed the space between Patented Nov. 22, 1927.

UNITED STATES PATENT OFFICE.

SAMUEL enoaen ra'rnor wasnrnc'ron, DISTRICT or COLUMBIA, ,ASSIGNOR 1T0,

UnIoIv srncrar macnrun' coMraN on CHICAGO, I LIN'oIs, A CORPORATION or ILLINOIS.

Application filed July 18,

although more particularly to the over-edge looper mechanism of an over-edge typeof In over-edge sewing machines, such as is shown in Patent 962,974, issued June-28th,. 1910, to Lansing Onderdonk, the overedge looper is fulcrumed below the throatv plate pivot which is located to the left of the needle. This overedge looper, c00per-: ates with the under looper to project a loop of thread upwardly-around the edge of the work to a position above the work, whereby the needle in its descent will enter said loop. Not only the timing of these stitch forming instrumentalities,but also the points of cooperation must be certain. For instance, the overedge looper in its ascending movement, must pass the under looper at a fixed point relative to the thread eye .of said under looper, and at the upper end of its movement the overedge looper must be positioned at a fixed point relative to the-needle, whereby the needle will with certainty enter the. loop of thread carried upwardlyby said overedge looper. *Therefore, the radius of the overedge looper must be fiXedand' consequentlythe upper surface of the throat plate and the are prescribed by the overedge looper is limited tosuch ancxtent that work of ordinary thickness only can be stitched on suchmachine- In other words, the stitch forming instrumentalities cannot be adjusted to create sufiicient space for the passage of heavy sweater work or the like, under the overedge looper. F urthermore, by pivoting the overedge looper at a point to the left of the needle, it is impose sibleto locate a horn atthe left of the needle around which stockings may beturned when it is desired to hem the upper portions thereof. I 7 One of the important objects of my-invention is, therefore,- to provide an overedge looper mechanism by which'the looper will be caused to travel in a path whereby a considerably increased space between the upper surface of'the throat plate and the path of travel of the looper willbe obtained, thus permitting heavy sweater work, or the likc, to be stitched. V v 1 a j Another importantobject of my invention is to provide in an overedge mechanism OVEREDGE-LOOPER MECHANISM FOR SEWING MACHINES.

1924, ser al no. 72 ,742.

type describechmeans for varying the path of the looper travel whereby said travel may be adjusted'to suit vvarious working conditions. 1

- A still further object of my invention'is to support and actuate the overedge looper by means located entirely onthe right-handv side of the needle, thereby positioningof a hornat the le termitting the of the needle for use in hemming stockings or other small tubular articles.

Theseand other objects will part be obvious and will in part be hereinafter more fully described.v i i V In the accompanying drawings which illustrate one form of my invention Figure 1 is a front elevation, partly in section, showing the application of my invention;

Fig. 2 is a view showing more or less diagrammatically, the throat plate, the needle, and the co-operating stitch forming instrumentalities, the needle being at the lower endof thisstroke; and

Fig. 3 is an end. iew of the overedge looper mechanism, parts thereof being shown in section. e

Referring to the drawings in detail, 5 des ignates a threat plate or work support, which is provided with the usual opening through which the threaded needle 6 reciprocates in a vertical plane. The needle 6 is carried by needle bar 7 and the latter is reciprocated from an upper rotary shaft 8 through the medium of a lever 9.

Co-operating with the needle 6 below the throat plate is a' threaded under looper 10 which is mounted in a looper carrier 11 pivoted to the machine frame as at 12, below the throat plate and on the right of the needle. The carrier is provided with a rock arm which is connected by a link 13'to an arm 14 on the lever9. Thus the rotary shaft oscillates the under looper back and forth in a single plane, the looper moving in rear ofv the needle and toward the right when it enters the needle thread loop, the point of the looper at the end of the looper movement being located a distancewell tolthe right of the right-hand edge of the throat plate 5.

- 'Co-operating with'theunder looper 10 and or a looper of the spreader type, both forms being recognized this art asbeing 'substr tuted, one for the other, for the production of either a three-thread or two-thread stitch.

looper to include either type of looper. This overedge looper is removably mounted in the upper end of a substantially vertically disposed looper supporting rod 16 Whieh'as supported on the machine frame through the medium of sliding pivot-a1 eenneetien whieh I have designated by the numeral 17. This connection comprises a bracket- 18 which-1's supported on the machine frame at the right of the throat plate by screws 19-, 19, which pass through slots 20, 20 to permit lateral adjustment of "the bracket. The ti per end of the bracket is tor-med with a bearing opening 21, the longitudinal axis being' in clined upwardly from front to rear, journalcd in this hearing is a stud 222 --hav'ing an opening-'23 formed in one end thereof receive the looper supporting rod 16. TlHS opening 23 is preferably tor-med a's-the re sult era sleeve 24 which is integral with the stud 22, and the longitudinal axis of said opening is disposed in a plane at right angles to the longitudinal a-Xis oil the stud 22. A rock shaft 25 is jou naletl on the machine frame at the right of the bracket 18 and is located below the horizontal plane containing the connection 17. Fixed to this shaft 25 is a rockarm 2'6 which is wpivoted as at 27, to the lower end of the looper supporting i'od 1'6. This rock arm 26 is rocked from the main rotary shaft 8 through the medium o l? a crank and a link29, the latter being pivotally connected with the rock arm by a pin and slot connection 30 to permit of adju'sfi meat to var the extent of rocking moveme'nt o't said arm. The rock shaft 25 is inclined upwar'dlytrom front't'o rear is "in parallelism with the axisof the stud 22, anti is preferably rockeo a di' st'ance equally above and below a horizontal line passing'through the center of the shaft 25.

In operation, as the needle begins to'rise the under ljooper moves to the right in rear of the needle and enters the needle thread loop. and terminates its right hand movement beyond, that is, at the right of the throat plate. The ever-edge loop'er then moves upwardly, due to the movement ofthe rock arm, and inasmuch as the pivot connec- 6011 30 travels in a substantially stra igli't line until the horizontal is reached, the looper will likewise travel upwardly in substantially a straight line. After the connection reaches "the horizontal, it will "be moved upwardly towards the ri ht'aad consequently the looper rod 'will be swung so as to move thelooper upwardly "and towards the left over the fabric and presser foot, to a position in. advance of the needle 6, whereby the latter. which has been rising in the meantime, will with 'certaint'yenter the loop of thread carried by said 'overedge looper.

Thus, by this overedge looper mechanism,

the looper is caused to move upwardly for a Therefore, I employ the term everedge considerable distance above the upper surface of the throat platebefore it begins'its right of the needle and consequently'ithe space on the left of the needle is clear-for the purpose of providing a horniabout which stoeki-ngs or other tubular work maybe turned for hemming. or other operations,

Having thus described any invention, what I claim as new and desire to secure by Letters Patent is: i

In a sewing machine the combination with a Work support, a vertically reciprocaor the to-ry need-lre, a threaded under 'looper 'c'ooperating with the needle below port, and fan everedge looper "co-operating with said under looper and needle to posi; than a loop of threadar'ound andabov'e said work support into position to be entered by the needle Clui'fllg its descent, means for sup;

porting said overedge looper, and :devices for -1noving said supporting means bodily l'oi'igi'tt'rdinally and for swinging said su porting means about a fixed center lying in the path othodily whereby said looper is moved upwardly substantially in a straight line IZ'OHLH gpointgin cooperation with the under lo'oper tot a point well above the work support and thence laterally and upwardly over the work support to -'a point on the opposite side of the needle so that the needle c-an enter the loop carried Toy-said overed ge looper.

2.311 a sewing machine, the combination with a work support, a vertically recipro'c'ato'ry. needle, "a threaded under 'l'oop'er co-operatin'g with the needle below the work support, and an overedge looper *co-op'erat ing'with' s'aid under lo'oper and needle to position loop of thread around and above said work support into position to be entered by the needle during its descent,- and means for supporting and operating :said' movement 'ofrth'e l'ooper,

the work sa crating with the needle below the work support, and an overedge looper co-operating with said under looper and needle to position a loop of thread around and above said work support into position to be entered by the needle during its descent, means for op erating said overedge looper comprising a looper supporting rod, a pivotal support for said rod in which the'rod slides, a rock arm having a fixed fulcrum and having its end pivoted to the rod, and means for oscillating said rock arm.

4. In a sewing machine, the combination with a work support, a vertically reciprocatory needle, a threaded under looper co-opcrating with the needle below the work support, and an overedge looper co-operating with said under looper and needle to position a loop of thread around and above said work supportinto position to be entered by the needle during its descent, and means-for operating said overedge looper including an upwardly extending looper supporting rod, a pivotal supporting connection therefor in which said rod slides, and means for 'recip rocating said rod longitudinally through said connection and for oscillating saidrod during said reciprocatio-ns.

5. In a sewing machine, the combination with a work support, a vertically reciprocatory needle, a threaded under looper cooperating with the needle below the work support, and an overedge looper co-operating with said under looper and needle to position a loop of thread around and above said work support int-o position to be entered by the needle during its descent, means for operating said overedge looper including an upwardly extending looper supporting rod, a pivotal supporting connection therefor in which said rod slides, and means for reciprocating said rod longitudinally through said connection and for oscillating said rod during said reciprocations, said reciprocatory means including a rock arm pivotally connected to said rod and movable from a point below to a point above a horizontal line passingthrough the fulcrum of said arm.

6. In a sewing machine, the combination with a Work support, a vertically reciprocatory needle, a threaded under looper co- 7 operating, with the needle below the work support, and an overedge looper co-operating with said under looper and needle to ponally'through said connection and for oscillating said rod during said reciprocations,

said sliding pivotal supporting connection comprising a supporting bracket, a stud journaled therein, and provided at one end with a vertically extending sleeve for receiving said looper supporting rod.

7. In a sewing machine, the combination with a work support, a vertically reciprocatory needle, a threaded under looper co-opcrating with the needle below the work support, and'an overedge looper co-operating with said under looper and needle to position a loop of thread around and above said work support into position to be entered by the needle during its descent, means for operating said overedge looper including an upwardly extending looper rod, a pivotal supporting connection therefor in which said rod slides, and means for reciprocating said rod longitudinally through said connection and for oscillating said rod during said reciprocations, said overedge looper operating mechanism being entirely located on the right-hand side of the needle.

8. In a sewing machine, the combination with a work support, a vertically reciprocatory needle, a threaded under looper co-opcrating with the needle below the work support, and an overedge looper co-operating With said under looper and needle to position a loop of thread around and above said work support into position to be entered by the needle during its descent, means for operating said overedge looper including an upwardly extending looper supporting rod, a laterally adjustable bracket, a stud journaled therein and provided-with an opening in which the looper supporting rod is free to slide, and means for reciprocating said rod longitudinally in said support and for oscillating said rod and the supporting stud thgrefor during the reciprocations of said ro In testimony whereof, I aflix my signature.

, SAMUEL GEORGE TATE.

Images