US1012182A - Hemstitch sewing-machine. - Google Patents

Description

O. M. ABERGROMBIE;

HEMSTITGH SEWING MACHINE.

APPLICATION FILED NOV.11,1910.

Patented Dec. 19, 1911.

2 SHEETSSHEBT 1.

I/l/l TNESSES:

BY iii (DIM A TTORNEY G. M. ABERGROMBIE.

HEMSTITOH SEWING MACHINE. APPLIOATIQN FILED NOV.11,1910.

1,012,182, Patented Dec. 19, 1911.

2 SHEETS-SHEET 2.

A TTORNEY UNITED STATES PATENT OFFICE.

CHARLES M. ABERCROMBIE, OF BRIDGEPOB'I, CONNECTICUT, ASSIGNOR TO SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

HEMSTITCH SEWING-MACHINE.

' Patented Dec. 19, 1911.

Serial No. 591,754.

To all whom it may concern:

Be it known that I, CHARLES M. ABER- CROMBIE, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Hemstitch Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in hemstitch sewing machines employing a loop-taker having movements in a given horizontal plane and a counter-shaft journaled in the standard of the overhanging arm, said counter-shaftbeing arranged parallel with and operated from the main shaft of the sewing machine and carrying the elements for positioning the needle in different vertical planes and for giving to the feeddog its vertical and oppositely directed feed movements.

Some of the earlier forms of the above referred to type of sewing machines were intended to meet the requirements of high speed but, owing to the disadvantages arising from integrally combining certain elements which should be capable of individual adjustment and separately constructing other elements which should be integrally formed or permanently secured against relative adjustment, they have failed to meet the demand of high speed.

The object of the present invention is to construct and arrange the needle-vibrating, feed-dog-actuating and stitch-forming mechanisms so as to remedy these defects and give to the construction as a whole the utility required for effecting high speed (2800 to 3000 stitches per minute), and to this end the prime members for actuating the feed-dog are integrally combined, those of the needle vibrating mechanism are capable of adjustment with respect to the former members, and these various members are adjustable with respect to the stitch-forming mechanism.

In the accompanying drawings illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is a view in elevation, partially in full lines and partially in section, of a hemstitch sewing machine of the herein de scribed improved type. Fig. 2 is an underside view of the machine shown in Fig. 1. Fig. 3 is a sectional view, in. elevation,

through the bracket arm standard. Fig. 4 1s a view of the needle threadtake-up and its directly connected actuating elements, together with the needle-bar link and a part of the needle-bar. Fig. 5 is a top plan view of the elements shown in Fig. 4. Fig. 6 isa view in perspective of the feed-actuating lever, together with certain directly connected elements later to be referred to. Fig. 7 is a view of-the needle-vibrating cam, the shaft operatively connected with said cam, and the elements carried by said shaft, together wlth views in cross-section of the main shaft, counter-shaft and bracket arm.

1 represents the bed-plate of the sewing machine, 2 the bracket arm provided with the head 3 and standard 4, 5 the main or needle-bar-driving shaft mounted in suitable bearings formed in the bracket arm and provided with the driving pulley 6, shaft flange 7 and belt-driving pulley 8.

9 is the needle-bar provided at its lower end with a bracket 10 upon which is pivoted, by screw 11, the needle-carrying bracket 12 which, in turn, has secured to it the lower end of a rod 13, the opposite end of said rod being connected by a swivel joint 14 to the needle-vibrating connection 15, said needlebar deriving its vertical movements through the attached needle-bar-driving link 16 fulcrumed at its upper end upon a stud 17 which is secured by screw 18 in the shaft flange 7 The stud 17 and arm 19 are formed integral and carry a roller 20 which coacts with a cam-groove 21 formed in the take-up lever 22- to give to the latter the required movements for controlling the needle thread and for tightening the stitch, said take-up lever being fulcrumed on a stud 23 which is secured by screw 24 in a bracket 25 formed integral with the rear side wall of the head 3, the opposite end of said take-up lever having secured to it, by screws 26, 26, a finger 27 provided with a threadeye 28.

29 represents a pinch collar carried by the needle-bar and provided with an extended forked portion 30 which coacts with the flattened portion of the rod 31 secured by screw 32, to hold the needle-bar against axial movement.

33 represents the loop-taker-driving shaft mounted in suitable bearings below the bedplate of the sewing machine and operatively connected, by the belt 34, with the main shaft 5 in a manner to give to said lower shaft two revolutions to one revolution of said main shaft. The shaft 33 at its for ward end carries a gear pinion 35 which meshes with a like pinion 36 carried by the loop-taker shaft 87. The shaft 37 is mounted in a bracket 38 which is secured by screws 89, 39 to the bed-plate 1, the opposite end of said shaft having secured upon it one form of commonly-employed looptaker (not shown).

40 represents the feed-bar provided at its upper side with the usual serrated feed-dog (not shown) and connected at its rear end, by screw bolt 41 and arm 42, with the feed rock-shaft 43, which latter at its opposite end is operatively connected with the feedconnection 44, through the arm 45 and stud bolt 46.

47 is the feed-lift rock-shaft which is connected at its forward end, by the arm 48, stud 49 and slide block 50, with the forked end of the feedbar 40, the opposite end of said shaft being connected with the feed-lift rock-shaft connection 51 through the pinch bracket 52 and stud 53.

54 represents a rod loosely mounted in suitable bearings formed in the arm standard, and upon said rod is secured, by screw 55, the feed-adjusting lever 56 provided with a threaded extension 57 which passes through a slot 58, formed in said arm standard, and is provided with a knurled head 59, the latter, when drawn in by the action of the screw thread, acting to confine the washer 60 between it and the curved portion 61, thereby holding said rod against movement except when it is desired to readjust the length of the stitch.

62 is an arm secured at one end, by screw 63, to the rod 54, its opposite end being pivotally attached to one end of a link 64, the opposite end of which latter is pivotally attached to the feed connection 44, thus, through the adjustment of the lever 56, effecting adjustments of said feed connection on the stud bolt 46.

65 represents the feed rock-lever provided with the shaft 66, the latter being mounted to oscillate in a cup-shaped bushing 67 secured by screw 68 in the hub 69 which forms a part of the standard 4. Secured to the shaft 66, by screw 70, is a follower 71 which oscillates in an opening 72 formed in said bushing, thus permitting adjustments of the feed rock-lever in the direction of the length of its shaft by an adjustment of said bushing to accommodate the working position of the feed-cam, later to be referred to, said follower acting to maintain a uniform relationship between said bushing and said rock-lever. The bushing 67 also comprises a hearing which is closed against the dripping of oil from the outer end of the shaft 66. To prevent the soiling of the fabric through contact with the follower 71, there is provided a circular spring washer 73 which lies directly over and closes the opening 72, except when adjusted to a position convenient for oiling the shaft 66.

The rock-lever 65 comprises transversely arranged arms 74 and 7 5. The arm 74 is provided at its free end with a roller 76 which tracks the feed-cam groove 7 7 formed in the feed-cam '78, secured by screws 79 upon the counter-shaft 80. The shaft 80 is mounted at one end in a cup-shaped bushing 81 secured by screw 82 in the arm standard, and at itsopposite end in a bearing formed in the bracket 83 extending inwardly from the inner front wall of said standard.

Upon the mainshaft 5 is mounted a gear wheel 84 which coacts with the gear teeth 85 formed on the periphery of the feed-cam 78 to transmit motion to the counter-shaft 80, the ratio of said gears being as one to three, thus giving to said feed-cam one rotation to three rotations of said main shaft, as is common in the construction of heinstitch sewing machines. The arm 7 5 of the rock-lever 65 is provided with a guide member 86 having an under-cut groove 87, later to be referred to.

To the upper end of the feed-connection 44 is pivotally secured by screw 88 a follower 89 provided with a guideway 90 and guidepin 91, said guide-way coacting with the guide member 86 to direct said follower in its adjustment toward and away from the axis of the shaft 66, and said guide-pin coacting with the under-cut groove 87 to hold said follower in alinement with said guide member, it being understood that the adjustment of the follower 89, through the connected elements previously pointed out, determines the amplitude of the feed movement-s; and as is common to sewing machines of this class, the cam-groove 77 is formed so as to effect one backward and two forward feed movements for each hemstitch figure.

The feed-cam 7 8 is provided with a camgroove 92 in which tracks a follower 93 mounted on a stud screw 94 secured in the upper end of the feed-lift rockshaft connection 51, whereby vertical movements are transmitted from said cam-groove to the feed-bar 40, through the connections 51, 52, 47 and 48. To maintain the follower 93 in proper relationship with its coacting camgroove, the counter-shaft 80 is provided with a loosely mounted guide-block 95 which coacts with the forked end 96 of the suitable bearings formed in the bracket arm, said crank shaft carrying at one end a segment lever 100 to which the needle-vibrating connection 15 is adjustably secured, and at its opposite end a crank arm 101 provided with a roller 102 which tracks the cam-groove 98, the latter, through the connections previously pointed out, causing the needle to descend in different vertical planes, in a manner common to hemstitch sewing machines.

It has not been deemed necessary to illustrate or describe the clothresser mechanism employed in connection with the present construction, as it is the same as that commonly employed in connection with hemstitching.

Claims 1. In a hemstitch sewing machine, a stitchforming and cloth-feeding mechanism including a main shaft, an eye pointed needle, a feed-bar, feed and feed-lift rock-shafts operatively connected with said feed-bar, a counter-shaft mounted in the bracket arm standard and geared to said main shaft, a feed-cam carried by said counter-shaft and provided with cam-grooves, connections between the latter and said feed and feed-lift rock-shafts, a needle-vibrating cam carried by said counter-shaft and adjustable with respect to the working position of said feedcam, and connections between said needlevibrating cam and said eye pointed needle including a crank-arm housed within the sewing machine bracket-arm and provided with a cam follower.

2. In a hemstitch sewing machine, a stitchforming and cloth-feeding mechanism including a main shaft, an eye pointed needle, a feed-bar, feed and feed-lift rock-shafts operatively connected with said feed-bar, a counter-shaft mounted in the bracket arm standard parallel to and operatively connected with said main shaft, a feed-cam carried by said counter-shaft and provided with cam-grooves, connections between the latter and said feed and feed-lift rock shafts, a needle-vibrating cam carried by said counter-shaft and adjustable with respect to the working position of said feedcam, and connections between said needle-vibrating cam and said eye pointed needle including a crank shaft having its axis arranged transverse to the axis of said main shaft;

3. In a hemstitch sewing machine, a stitchforming and cloth-feeding mechanism including a main shaft, an eye pointed needle, a feed-bar, feed and feed-lift rock-shafts operatively connected with said feed-bar, a counter-shaft mounted in the bracket arm standard and geared to said main shaft, a feed-cam carried by said counter-shaftand provided with cam-grooves, connections between the latter and said feed and feed-lift rock-shafts including a feed-lift rock-shaft connection forked at its upper end and operatively connected with a guide block loosely mounted upon said counter shaft, a needle-vibrating cam carried by said counter-shaft and adjustable with respect to the working position of said feed-cam, and connections between said needle-vibrating cam and said eye pointed needle. I

4:. In a hemstitch sewing machine, a stitchforming and cloth-feeding mechanism including a main shaft, an eye pointed needle, a feed-bar, feed and feed-lift rock-shafts operatively connected with said feed-bar, a counter-shaft mounted in the bracket arm standard and geared to said main shaft, a feed-cam carried by said counter-shaft and provided with cam grooves, connections between the latter and said feed and feed-lift rock-shafts including a feed rock-lever mounted to oscillate in an adj ustably secured cup-shaped bearing and held against adjustment independent of said bearing, a needlevibrating cam carried by said counter-shaft and adjustable with respect to the working position of said feed-cam, and connections between said needle-vibrating cam and said eye pointed needle.

5. In a hemstitch sewing machine, a stitchforming and cloth-feeding mechanism including a main shaft, an eye pointed needle, a feed-bar, feed and feed-lift rock-shafts operatively connected with said feed-bar, a counter-shaft mounted in the bracket arm standard and geared to said main shaft, a feed-cam carried by said counter-shaft and provided with cam-grooves, connections between the latter and said feed and feed-lift rock-shafts including a follower provided with a guide-way and a guide-pin, and a feed rock-shaft provided with a guide member having an under-cut groove into which said guide-pin projects, a needle-vibrating cam carried by said counter-shaft and adj ustable with respect to the working position of said feed-cam, and connections between said needle-vibrating cam and said eye pointed needle.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CHARLES M. ABERGROMBIE.

Witnesses:

ABBIE M. D'ONIHEE, WILLIAM A. F LANAGAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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