US1150321A - Cloth-presser mechanism for sewing-machines. - Google Patents

Description

C. M. ABERCROMBIE.

CLOTH PRESSER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 12, I912.

Patented Aug. 17, 1915.

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crIAELEs M ABERGROMBIE;OFfBRIDGEPORT, CQNNEGTIGUT,5ASSIGNOR To THE sINeER MANUFACTURING COMPANY, A oonrone'rrorr-or NEW JERsEY,

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Specification of Letters Patent. Patented Aug, 17, 1915.

Application filed March 12, 1912. serial'Nofi683g3fi4.

T all whom it may concern: V

Be it known that "I, GHAnLEs M; *ABER- GRQMBIE, a citizen of the United States, residing at Bridgeport, in the-county ofbEair field and State of Connecticut, haveinvented certain new and useful Improvements in Cloth-Presser 'Mechanism for Sewing-Machines, of which thefollowing -is a'specification, reference being had therein to the accompanying drawings. y

This invention relatesto improvements in cloth-presser mechanism for sewing machines, and is designed particularly for use in" connection with-"stitching 'hemstitch, em broidery and open-work seams, and has for its object to provide a cloth-presser adapted to the feeding of edge or hem folds presenting a greater number of plies of fabric at one side of the needle actuation than at the other.

In the construction of cloth-presser mechanisms such as are used in connection with the feeding of a comparatively large number of superposed plies of fabric unevenly distributed in the line of the seam it is all important, when such fabrics are of very thin texture as when hemstitching fine linens, that the control of the feeding mechanism shall be such as to prevent, as far. as

possible, the plies from slipping one upon 1 the other or from crowding when being drawn beneath the presser-foot.

T 0 effect the feeding operation prevlously referred to it is common to employ rocking cloth-pressers havlngcloth feeding surfaces of a length considerably greater than is employed 1n connect1on with ordinary sitchmg, whlch greatly increases the distance between the front or receiving ends of the clothpressers and the vertical axis of the springpressed presser-bar or bars, and when introducing several thicknesses of fabric under the receiving ends of the cloth-pressers the latter are rocked on their pivots, which, in-

the earlier constructions, veffects vertical movements of the vertically mounted spring.

pressed cloth-presser carriers and the greater the distance between the pivotal points of the cloth-pressers from a line correspondmg to the vertical axis of the carriers the greater is the resistance offered to the feeding of the fabric uncler the receiving ends of the presse'rs. r

In the present construction the presser- Figure 1 is a front bracket arm of a hemstitch sewing machine equipped with the present invention, together with a front edge view of the sewing machine bed-plate. Figs. 2 and 3 are front and rear side views, respectively, of the improved cloth-presser mechanism.

The invention is shown as applied to one form of Singer commercial hemstitch sewing machine, but as it relates only to the construction and application of the cloth-presser mechanism, only such reference will be made to the other elements of the machine as is deemed necessary for a proper understanding of its application.

Referring to the figures, 1 represents the usual bracket arm of the sewing machine mounted upon the bed-plate 2, 3 the presserbar operatively mounted in the end of the overhanging arm and having the usual presser spring 4:, 5 a presserbar bracket secured by screw 6 to the lower end of said bar, 7 and 8 left and right hand presser-footcarrying levers mounted on the bracket 5 by pivot screw 9, the latter being held against accidental displacement by a screw 10, and 11 and 12 left and right hand presser-feet pivotally attached by pins, as 13, to their re spective levers 7 and 8.

l4 and 15 represent springs seated in suitable openings, as 16, formed in the bracket 5. The lower ends of said springs are seated on the upper edges of the respective levers 7 and 8, and their upper ends contact with the end walls, as 17, of the screws 18 and 19 threaded into the upper end of the bracket 5, the adjustment of said screws effecting an independent control of the amount of pressure exerted by each of the presserfeet, thus makingit'practical to give to the plies of fabric passing at one side of the needle a greater or lesser degree of pressure than to the ply or plies passing at the opposite side of the needle.

20 represents the commonly employed presser-bar lifting lever for effecting "vertical movements of said presser-bar in opposition to the resiliency of the spring 4.

From the foregoing it will be understood that when the fabric is presented to the receiving ends of the cloth-pressers it acts to rock the levers 7 in opposition tothe springs 14 and 15 until the upper edge of said levers are brought near or in contact with the lower edge of the bracket 5, so it will be seen that in the earlier constructions the initial feeding of the fabric to the action of the needle forces the vertically mounted spring clothpresser carriers upward by a leverage applied at a substantial distance from the axis of said carriers, while in the present construction a leverage is provided which effects an entrance of the fabric beneath the cloth- I pressers under conditions of reduced pres- Copies of this patent may be obtained for sure while the maximum of pressure becomes efiective as soon as thevfabric has passed the line of pivotal engagement of the clothpressers with their carriers. i

Glaim:--

In a cloth-presser mechanism for sewing machines, the combination with a springdepressed cloth-presser carrying bar, a bracket carried by the latter and provided with spring pockets, spring controlled clothpresser carrying levers pivoted at one end to said bracket and at their opposite ends provided with pivotally secured cloth-pressers, of springs mounted in said pockets and acting independently, on said levers to depress said cloth-pressers. r

In testimony whereoilhave signed my five cents each, by addressing the lloinmissioneri ofZatents. Washington, D. C." V r e I i

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