US681684A - Alternating pressers for sewing-machines. - Google Patents

Description

"No. 68!,684. Patented Sept. 3, Mil.

P. DIEHL &. ll. HEMLE Bf ALTERNATING PBESSEBS FOB SEWING MACHINES.

(Applicntion filed Jan. 10, 1901.) (No Model.) 2 Sheets-Shoot I.

No. 681,684. Patented Sept. 3,1901. P. DIEHL & m. HEMLEB.

ALTERNATING PRESSEBS FOB SEWING MACHINES.

(Application filed Jan. 10, 1901-) (No Model.) 2 Sheets-Sheet 2.

Illllllllllllll UNITED STATES PATENT OFFLCE.

PHILIP DIEHL AND MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, OF NEW JERSEY.

ALTER'NATING PRESSERS FOR SEWING-MACHINES.

'srncrmcarzon forming part of Letters Patent No. 681,684, dated September 3, 1901.

Application filed January 10, 1901. Serial No. 42.764. (No model.

To all whom it may concern:

Be it known that we, PHILIP DIEHL and MARTIN HEMLEB, citizens of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Alternating Pressers for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide a simple and positively-operating mechanism for actuating the alternating pressers of a sewing-machine so as to adapt the alternatin g pressers to high-speed machines. To this end an angular lever which imparts alternating lifting movements to the main and auxiliary pressers is operated from a rock-shaft, which is in turn positively operated in all of its movements from an eccentric on the rotating driving-shaft of the machine.

In the accompanying drawings, Figures 1 and 2 are front end views of the upper part of a machine embodying the invention with the parts in different positions. Fig. 3 is a rear side view of the forward part of the upper portion of the machine, and Fig. 4: is a cross-section to show the operating eccentric and connections.

Referring to the drawings, ctdenotes a portion of the arm of a sewing-machine, in the upper part of which is journaled the drivingshaft I), provided just rearward of the needlebar-operating crank and preferably formed integral with said crank with an eccentric a, connected by a pitman d with the rear arm e of a rock-shaft f, journaled in a bracket g, attached to the arm a, said rock-shaft having near its forward end a second arm h, connected by a link orpitman t to the upper arm of an angular lever j, pivotally attached by a screw it to a block Z, secured to the main presser-bar m, provided with the foot a.

Pivotally attached to the elbow portion of the leverj by the pivot-screw r is the swinging auxiliary presser-bar 0, provided with the foot p, said bar 0 being loosely received in a groove or recess q in the front face of the lower part of the arm a.

The main presser-footnbears on the work when the needle is in the material, the auxiliary foot 19 being at this time lifted, as shown in Fig. 1, and as the needle rises the movement of the rock-shaft f operates the angular lever j, turning at this time on the screw as a fulcrum, causing the elbow portion of said lever, to which the auxiliary presser is pivotally attached, to descend. When the auxiliary presser-foot 13 reaches the work and the further downward movement thereof is thus arrested, the lever j will turn on the pivot-screw r as a fulcrum, causing the main presser to be lifted from the work. The feed now takes place, and as the feed-dog moves forward the auxiliary presser-foot, now bearing on the work, swings forward to the position shown in Fig. 2 with the said feeddog, between which latter and said auxiliary foot the work is now clamped, so that the several plies of material (for the feeding of which the swinging auxiliary presser is adesirable adjunct) will all move uniformly together, thus avoiding any drag or slip of one thickness or piece of material on the other, as is liable to occur in some classes of work by the friction of a non-moving presser-foot. When the feed-dog has reached the limit of its forward movement, the return rocking movement of the shaft f causes the main presser-foot to descend, and when said main presser-foot reaches the work the auxiliary foot rises clear of the work and is returned to its first position, Fig. 1, by the spring 8, attached to the block Z and bearing at its lower end against the auxiliary presser-bar.

From the foregoing it will be understood that the mechanism for alternately lifting the main and auxiliary pressers is strong and positive in its operation and adapts the alternating pressers to machines running at much higher speeds than the operating mechanisms heretofore employed for this purpose.

Having thus described our invention, we claim and desire to secure by Letters Pat exit-- 1. In a sewing-machine, the combination with a rotating shaft provided with an eccentric, of main and auxiliary pressers, an angular lever pivotally mounted on a block attached to the main presser-bar and to the elbow portion of which angular lever the auxiliary pressenbar is pivotally attached, arockshaft operatively connected with said eccentric, to be operated thereby, and with said a11- gular lever, to operate the latter, and a spring for effecting the return swinging movements of the said auxiliary presser after it has moved forward with the machine feed-dog.

2. In a sewing-machine alternating-presser mechanism, the combination with a main prcsser-bar provided with a block and with a resser-foot, of an angular lever pivotally mounted on said block, an auxiliary presserbar pivotally connected with the elbow portion of said angular lever and provided with a foot, a rotating shaft provided with an eccentric, arock-shaft having two arms, a pitman connecting one of said arms with said eccentric, a second pitman or link connecting the other of said arms with said angular lever, and a spring for efiecting the return swinging movements of the said auxiliary pressenbar.

In testimony whereof we affiX our signatures in presence of two witnesses.

' PHILIP DIEHL.

MARTIN HEMLEB. Witnesses:

HENRY OALVER, HENRY J. MILLER.

Images