US1745152A - Sewing-machine presser device - Google Patents

Description

. Jam :28, 1930. H; CORRALL ET AL 1,745,152

SEWING MACHINE PRESSER DEVICE Filed May 5, 1927 i l iihiiiiiii Patented Jan. 28, 1930 PATENT OFFICE HERBERT CORRALL, OF OAKFIELD, HELEN BANK, SCOTLAND, ASSIGNORS TO THE SBURGH, AND JAMES I-IEGGIE, OF CLYDE- IVIANUFACTURING COMPANY, OF

ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY SEWING-MACHINE PRESSER DEVICE Application filed May 3, 1927, Serial No. 138,485, and in Great Britain September 6, 1926.

This invention relates to improvements in sewing machines for fur and glove sewing, being particularly applicable to so-called overhead sewing machines of the scale-pan type, and aims to provide convenientl operable means for varying instantly the pressure exercised on the work sustained between the usual feed cups to take account of changes in the character of the work being.

stitched.

As is understood, in machines of the type in question, pressure is applied to the presser or outer feed cup by a spring acting through a train which usually includes an adjustable screw.

Apart from the loss of time involved in effecting the adjustment of the screw, which in certain constructions may not be convenient of access, there is experienced the drawback that an adjustment once departed from by shift of the screw may not be exactly restored when desired.

The invention consists broadly in the inclusion in the train referred to of means, preferably a cam device, instantly shiftable from one to another of a plurality of predetermined positions each corresponding to a given pressure exercised on the feed cup so that depending on the number of stages of movement allowed by the contour of the cam there is available to the operator a choice of a range of adjustments instantly realized by turning the cam from one predetermined position to another.

The cam may be substantially in the form of a pivoted disk operable by a finger piece and having a cam edge comprising portions unequally spaced from the pivotal center, the cam constituting a stop located at a point of the train convenient to the operator.

Conveniently the cam may be engageable with a plunger guided in a tube bearing on a lever element of the train, the tube and plunger being surrounded by a helical spring in compression urging the lever in the direction to press the outer feed cup towards its fellow feed cup.

The train may include elements in screwthreaded relation with one another, permitting of fine adjustment irrespective of the position of the cam.

In the accompanying drawings illustrating the preferred embodiment of the invention, Fig. 1 is a side elevation, partly in section, of a sewing machine embodying the invention. Fig. 2 is a fragmentary rear end view of the machine.

The sewing machine illustrated, which is of the glove and fur sewing type, comprises a frame 1 in which is mounted the horizontally reciprocating needle-bar 2 carrying the needle 3 with which the looper t cooperates in the usual manner to form stitches. The needle and looper are actuated by suitable mechanism connected with the main-shaft- 5 carrying the hand-wheel 6. The feed-cup 7 is carried by the vertical feed-shaft 8 to which step-by-step movements are imparted by a suitable clutch-mechanism operated by the link 9 and bellcrank 1-0 receiving motion from the pitman 11 connected to be operated from the main-shaft 5.

The presser-wheel 12 is carried by the overhanging end of the presser-arm 13 rising from the resser-lever 14; which is fulcrumed on the usual trunnion-screws 15 within the lower part of the frame 1. The Presser-lever 14 extends rearwardly through an opening 16 in the machine frame where it is adapted to be engaged by a treadle-operated lever 17 to shift the presser-wheel 12 away from the feed-cup 7 for insertion or removal of work.

Working pressure is applied to the presserwheel by means of the coil-spring 18 which bears at its lower end upon the presser-lever 14 and at its upper end against the head 19 at the upper end of the pin 20 which at its lower end enters a sleeve 21 disposed within the spring 18 and entering a depression 14; within the presser-lever 14.

Threaded into the frame 1, coaxially with the spring 18 and pin 20, is the sleeve 22 within which is disposed a slide pin 23 resting upon the pin 20. The sleeve 22 is slotted at its upper end to receive the cam-lever 24 fulcrumed on the screw 25 and having a camedge comprising four distinct portions or flats 26 26 26 and 26 disposed at progressively increased distances from the fulcrumscrew 25. The upper rounded end of the slide-pin 23 engages the cam-edge of the lever 24 and determines the degree of compression of the spring 18. It will be understood that cam-lever 24 may be instantly turned to bring any selected one of the flats 26, 26*, 26, 26 to bear upon the slide-pin 23 and thus instantly adjustthe pressure of the spring 18 upon the resser-lever to any one of four different pre eterniined Working pressures.

A fine adjustment irrespective of the position of the cam-lever 2 may be obtained by screwing the threaded sleeve 22 into or out of the frame 1 and relocking it in adjusted position by means of the lock-nut 27.

Having thus set forth the nature of the invention, what we claim herein is:

1. In a machine of the fur and glove sewing type, the combination with a feed-cup, of a presser-cup cooperatively related to the feed-cup, a pivoted lever carrying said presser-cup, a spring bearing at one end upon said lever to urge the presser-cup toward the feed-cup, and a manually operated cam acting upon the other end of said spring to instantly change its working force from one predetermined value to another.

2. In a machine of the fur and glove type, the combination with the frame and feed-cup, of a presser-cup cooperatively related to the feed-cup, a pivoted lever carrying said presser-cup, a coil spring bearing at one end upon said lever, a sleeve carried by said frame in axial alinement with and adjacent the other end of said spring, a spring compressing plunger in said sleeve, and a 1nanually operated cam pivotally mounted on said sleeve for moving said plunger.

In testimony whereof, we have signed our names to this specification.

HERBERT CORRALL. JAMES HEGGIE.

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