US1260772A - Feeding mechanism for sewing-machines. - Google Patents

Description

M. HEMLEB.

resume MECHANISM FOR SEWING MACHINES.

APPLICATION FILED APR. 30' I915.

Patented Mar. 26,1918.

WITNESES: jaw! 4;

v 212E131 mmnnia, or ELIZABETH,

NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, A. CORPORATION OF NEW JERSEY.

FEEDING- MECHANISM FOR SEWING-MACHINES.

Specification of Letters Eatent. Patented Mar. 26, iglfia Application filed April 80, 1915. Serial No. 24,858.

To all whom it may concern:

Be it known that I, MARTIN HEMLEB, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, haveinvented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in feeding mechanism for sewing machines, and particularly to that class of feeding mechanism in which two differentially-moving feeding members are employed to engage the work between their upper faces and the resser-foot or resser-feet. The object of the present invention is to provide means whereby the work may be instantly relieved from the action of one feeding member during the operation of the machine. I a The sewing machine frame comprises the usual bed'and overhanging head, the latter supporting the needle and presser-bars. The driving shaft is journaled in the bed of the frame, and is operatively and adjustably connected With a feed-rocker, the latter being connected with the main feed-bar which is formed with a yoke embracing a feed-lift eccentric on the driving shaft. The auxiliary feed-dog is carried by a secondary feed-bar which also has an adjustable connection with the feed-rocker and which is provided with suitable connections with a feed-lift eccentric on the driving shaft.

Clamped upon the presser-bar is a carrier for a resser-foot adapted to coact with the main eed-dog, and pivotally mounted u on the carrier is an auxiliary presseroot adapted to coact with the auxiliary feeddog. The auxiliary presser-foot is normally maintained in operative relation with the auxiliary feed-dog by means of a spring suitably supported by the Presser-foot carrier. A cam-lever mounted upon the carrier is so related to a projecting lug of the auxiliary presser-foot that, on depression of the cam-lever the auxiliary resser-foot is rocked on its pivot and raised above the auxiliary feed-dog, so that the latter reciprocates idly below the work. For convenience of operation, especially while the machine is running, a treadle device may be applied to the cam-lever.

In the drawings, Figure 1 is a front elevat1on of my improvements as applied to a sewing machine frame indicated in dotted lines. Figs. 2 and 3 are perspective views of the auxiliary presser-foot and cam-lever and Figs. 4 and 5 are perspective views of the resser-foot carrier and main presserfoot respectively. Fig. 6 illustrates a modification of the improvements, in which an extension of the presser-foot shank forms the operating lever.

The differential feeding mechanism illustrated in the drawing is not claimed specifically herein and any differential feeding mechanism comprising two independent feed-dogs maybe employed. In the said figure, the dotted lines indicate the bed A of a sewing machine, two upright supports a, a rising from the bed to support the workplate, which is not illustrated, and a laterally projecting bearing-support b for the rock-shaft 1 of a feed-rocker comprising the arms 2, 2 and 3 fixed upon said shaft. The depending arm 3 is provided at its end with an aperture to receive the stud 4 clamped within an aperture formed in the end of a pitman 5 provided with a strap 6 embracing an actuating eccentric 7 on the main shaft 8, the said eccentric being adjustable, if desired, in the well-known manner. To the upper end of the rocker arm 2* is connected, by means of stud 9 and set-screw 10, the outer end of the main feed-barll which, at its opposite end, is provided with a depending yoke'll embracing a feed-lift eccentric 12 on the main-shaft 8. The substantial'ly vertical auxiliary feed-bar 13 is formed intermediate its length with an aperture adapted to receive a stud 14 clamped Within a suitable aperture formed in a swinging link 15 carried by a rock-shaft 16 journaled Within suitable bearing apertures formed in the frame. A suitable auxiliary feed-lift eccentric on the main shaft 8 is embraced by a yoke-arm 17 clamped upon 100 auxiliary feed-bar from the arm 2 of the 105 feed-rocker. To this end said arm is provided with a longitudinal slot 8 adapted to receive a slide-pin 18 clamped within one end of a 1ink-bar 19 which bar, at its opposite end, is pivotally connected at 20 with no the lower end of the auxiliary bar. It will be seen that adjustment of the slide-pin Within slot 8 of the rocker will move arm 19 toward and from the axis of movement of the rocker and thereby cause the feeding movements imparted to the auxiliary feedbar to be varied in greater or less degree.

The auxiliary feed-dog 21 carried at the upper end of the auxiliary bar is of the usual form, being provided with a shank 21 fitted within a recess or seat formed in the bar and secured in position by means of the screw 22. The main feed-dog 23 also is of a known construction and is provided with a depending shank 23 which fits within a lateral opening slot or seat formed in the main feed-bar 11, being secured within said seat by means of the screw 24.

. The head B overhanging the bed-plate supports, as customary, the needle-bar 25 and presser-bar 26. Upon the presser-bar is clamped the presser-foot carrier 27 formed with the ribs 27 X which embrace the flattened lower sides of the resser-bar, the carrier being formed also with the slot 28 WlllCh receives fastening screw 28 by means of which the carrier is secured for vertical adjustment upon the resser-bar. presser-foot 29 is formed with the upwardly extending apertured lugs 30 embracing the carrier and pivotally connected thereto by means of pin 31. The auxiliary resser-foot 32 is pivotally connected tothe carrier at 34 and is formed with a laterally extending shank 33 having an upwardly projecting lug 33*. A coiled spring fitted within a boss 35 of the carrier rests upon the upper edge of the auxiliary presser-foot shank and serves normally to press the auxiliary foot downwardly into contact with the work,

the spring being engaged at its upper end,

by a stop pin 37 held in adjusted position within the boss by means of a set-screw 38.

A guiding-stud 39 supported by the carrier and passing through a slot 40 formed in the shank of the auxiliary foot aids to prevent lateral deflection of the latter, as shown in Fi 1. y

.T t will be understood from the foregoing that the auxiliary presser-foot is capable of upward movement a ainst the pressure of spring 36, without affecting the position of the main presser-foot 29, and that the elevation of the auxiliary foot will relieve the material overlying the auxiliary dog from pressure, the latter meanwhile reciprocating idly. A cam-lever 40 may be emlployed to raise the auxiliary presser-foot. n Fig. 1, the cam-lever is shown fulcrumed at 41 upon the carrier 27 and provided .with a cam-surface 42- which, when the lever is depressed serves to engage thelug 33 of the auxiliary presser-foot shank so that the lat ter maybe rocked upon its pivot 34 to lift the auxiliary dog. The lever 49 may be The main inseam manipulated during the running of the machine to instantly arrest the effective action of the auxiliary dog, and for convenience in operation a treadle-device, indicated at 43, may be connected to the end of the lever to act in opposition to a spring 44 interposed between the lever and a fixed member such as the bracket 45 on the machine head 6.

In some instances it may be found desirable to extend the shank of the auxiliary resser-foot so that it may be manipulated directly, by hand or through the instrumentality of a treadle-device. The presser mechanism as thus modified is illustrated in Fig. 6 of the drawings. As shown in said figure, the shank of the auxiliary presser-foot is extended to form the lever-arm 40 which is v invention, what I claim herein is 1. In a sewing machine, the combination with feeding mechanism, comprising a main feedmember, an auxiliary feed-member, and actuating means therefor, of main and auxiliary presser-members arranged to cooperate with said main and auxiliary feed members, respectively, a carrier common to both of said presser-members, a spring sup- 100 ported by said carrier and acting upon the auxiliary resser-member, and means for 3. In a sewing machine, the combination 115 with differential feeding mechanism comprising main and auxiliary feeding members and actuating means therefor, of a resser-foot mechanism consisting of a presser-bar, a carrier supported thereby, 120

mainand auxiliary feet supported by the carrier .in line with each other and cooperating with said feeding members, a spring carried by the carrier and acting u on the auxiliary foot, and'means for raising the 125 auxiliary foot from its cooperative relation with the auxiliary feeding member independently of the main foot whereby the difierential feeding action may be suspended.

raising the auxiliary Presser-member with- I Laeoma 4. In a sewing machine, the combination with differential feeding mechanism comprising main and auxiliary feeding members and actuating means therefor, of a presser-foot mechanism consisting of a presser-bar, a carrier supported thereby, main and, auxiliary feet with flat work-engaging surfaces pivotally supported by the carrier, said feet being in line and cooperatively arranged with relation to the feeding members, a spring mounted in said carrier and acting 'upon the auxiliary foot, and means for raising the auxiliary foot whereby the diflerential feeding action may be suspended.

5. In a sewing machine, the combination with differential feeding mechanism comprising main and auxiliary feeding members and actuating means therefor, of a presser-foot mechanism consisting of a presser-bar, a carrier supported thereby, main and auxiliary feet pivotally supported by the carrier in cooperative relation to the feeding members, a spring for yieldingly pressing the auxiliary foot toward the auxiliary feeding member, and manual means for raising the auxiliary foot in opposition to said spring including a treadle operated cam-lever for engaging and swinging said auxiliary foot about its pivot.

6. In a sewing machine, the combination with differential feeding mechanism comprising main and auxiliary feeding members and actuating means therefor, of a presser-foot mechanism consisting of a Presser-bar, a carrier supported thereby, main and auxiliary feet pivotally supported by the carrier in cooperative relation to the feeding members, a spring for yieldingly pressing the auxiliary foot toward the auxiliary feeding member, manua means for raising the auxiliary foot in opposition to said spring including a treadle operated cam-lever for engaging and swinging said auxiliary foot about its pivot, and a second spring normally holding said treadle operated cam-lever in a position out of lifting relationwith said auxiliary foot.

7. A presser device comprising a carrier, a main pressenfoot sustained by said carrier, an auxiliary Presser-foot pivotally connected to the carrier, said carrier being provided with a socket, a spring adjustably arranged within said socket, and a lifting de vice for said auxiliary presser-foot for moving the same relatively to the carrier and without affecting the main presser-foot.

8 In a sewing machine, a presser-bar, a main resser-foot carried by said bar, an auxiliary presser-foot pivotally connected to said bar and having a work-engaging portion arranged in advance of said main presser-foot, an arm on said auxiliary foot, a spring yieldingly pressing the auxiliary foot downwardly, and lifting means for raising said auxilairy foot including a manually operable cam-lever pivotally connected to said presser-bar whereby the auxiliary foot may be lifted independently of the main presser-foot.

In testimony whereof, I have signed my name to this specification.

MARTIN HEMLEB.

Images