US1309575A

US1309575A - Plamoobapii co

Info

Publication number: US1309575A
Authority: US
Publication date: 1919-07-08
Anticipated expiration: 1936-07-08

Description

G. S. HILL.

SEWING MACHINE.

APPLICATION FILED AUG.28, I916- 1 109,575. Patented July 8, 1919.

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G. S. HILL.

SEWING MACHINE.

APPLICATION FILED Auc.2n. I916- 1,309,575, Patented J uly 8, 1919.

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G. 81 HILL.

SEWING MACHINE.

APPLICATION FILED AUG.28. 1916.

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Patented July 8, 1919.

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GEORGE S. HILL, OF STRAFFORD, NEW HAMPSHIRE, ASSIGNOR, BY MESNE ASSIGN- MEN TS, TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Application filed August 28, 1916.

To all whom it may concern Be it known that I, GEORGE S. HILL, a citizen of the United States, residing at Strafi'ord, in the county of Strafi'ord and State of New Hampshire, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to machines for sewing overseams.

The object of the invention is to provide novel and improved mechanism for taking loops of the upper needle thread and spreading them for the passage therethrough of subsequent upper needle loops in the production of overseam stitches, which is well adapted for sewing a single thread overseam about a buttonhole. To this end the invention comprises the features of construction and combination of parts hereinafter described and referred to in the claims, the advantages of which will be apparent to those skilled in the art from the following detailed description of the mechanism shown in the accompanying drawings which embody the preferred form of the invention.

In the drawings, Figure 1 is a sectional elevation showing so much of a buttonhole sewing machine as is necessary to illustrate the application of the present invention thereto; Fig. 2 is a partial transverse sectional elevation on line 2, Fig. 1; Fig. 3 is a detail plan view of the turret which carries the under sewing mechanism; Fig. 4 is a sectional elevation on line 4, Fig. 3; and Figs. 5 to 13 are diagrammatic views showing the mode of operation in forming the overseam stitches.

In the drawings the invention is shown as embodied in a buttonhole making machine, the general construction and mode of operation of which is similar to that of the machine shown and described in application Serial No. 104,449, filed June 19, 1916. The machine comprises in general a cutter which operates to cut the buttonhole slit after the completion of the sewing, a reciprocating and laterally moving work clamp, and a sewing mechanism which is rotated during the sewing about the eye of the buttonhole, and which comprises a verti- Specification of Letters Patent.

Patented July 8, 1919.

Serial No. 117,240.

cally reciprocating and laterally vibrating or jogging upper needle and cooperating loopmg and loop spreading devices arranged below the work.

In the machine shown the work clamps, indicated at 2, are mounted upon the work supporting plates t which are pivoted on a longitudinally and laterally moving clamp carriage 6. The clamps are automatically closed at the beginning of the sewing, and are automatically opened after the completion of the buttonhole, by mechanism which forms no part of the present invention, and which need not be described. The buttonhole slit is out after the completion of the sewing by a cutter 8 operated by a cam on the main cam shaft of the machine. The work is carried by the clamp over a throat plate 10 mounted upon the turret 12 which carries the under looping and loop spreading mechanism.

In the embodiment of the invention shown, the sewing mechanism is adapted to form a single thread overseam and comprises a vertically reciprocating and laterally jogging upper needle 14 and two pairs of opposed looper and loop spreader points, arranged to reciprocate below the throat plate and constructed to carry alternate needle loops laterally and to spread them for the passage therethrough of the next succeeding needle loop. The

looper points

16 and 18 are secured in the arms of an oscillating support or carrier 20 and each point is provided with a forked or notched end adapted to enter a needle loop and carry it forward. The spreader points 22, and 24: are arranged to enter the needle loops with the looper points and are secured in arms of a carrier 26 which is mounted on the oscillating support 20 to move about an axis substantially at right angles to the axis of the support. The support 20 is provided with two separated bearings 28 mounted to turn on the inner ends of studs 30 which are secured in lugs projecting from the upper edge of the turret 12. The support is oscillated through a link comprising a tubular part 32, to the upper end of which is secured an arm 34 connected to the support. The lower end of the link is connected by a ball joint with the forward end of a lever 36, which is rocked to'oseillate the support by a thre cornered eccen;

tric 38 secured to the sewing shaft 40, and engaging a fork 42 on the upper end of a link 44, the lower end of which is connected to the rear end of the lever. The carrier lever 26 is mounted on a pivot 46 arranged on the support between and at right angles to the pivot studs 30. The lever is provided with a horizontal arm 48 arranged substantially in the axis of the support 20, and having its outer end connected by a ball and socket joint to the upper end of an arm 50, the lower end of which is secured to the upper end of a tube 52 which extends down through the tube 32, and is connected at its lower end by a ball joint to the forward end of a lever54. The lever 54 is rocked to oscillate the carrier 26 by an eccentric 56 on the needle shaft 58 which engages the upper end of a link 60, the lower end of which is connected to the lever. Since the needle shaft 58 is geared to make two revolutions for each revolution of the sewing shaft 40,

the carrier 26 will be oscillated during the movement of the support 20 in each direction to impart the proper transverse movements j to the spreader points.

The mode of operation of the sewing mechanism in forming the single thread overseam stitches is illustrated in Figs. 5 to 13. During the depth stroke of the upper needle the support 20 is rocked toward the left in Fig. 5 to project the end of the looper 18 and the end of the overlying spreader point 24 through a needle loop thrown out by the needle as it starts upward from its lowest position. This loop is carried toward the left by the looper point 18 into the position indicated in Fig. 5 and as it is carried into this position the carrier 26 is rocked transversely of the direction of travel of the looper and spreader points as indicated in Fig, 6, so that the needle loop is spread and held in position for the passage therethrough of the needle during its slit or stitch stroke. After the needle in making its slit stroke has entered the loop the carrier 20 is rocked toward the right. During the first part of this movement the looper and

spreader points

18 and 24 are withdrawn from the needle loop and the carrier lever 26 is rocked to return thespreader points into position above the looper points as indicated in Figs. 7 and 8. During the continued movement of the carrier 20 toward the right, the looper and spreader points 16 and 22 enter a loop thrown out by the needle as it starts upward as indicated in Figs. 9 and 10. During the continued movement of I the support 20 toward the right the looper carries the loop of needle thread forward 'w-ith it and the carrier lever 26 is rocked to move the spreader points transversely so that the point 22 spreads the loop of needle thread and cooperates with the looper point in presenting it in position for the passage of the needle therethrough during its next depth stroke as indicated in Figs. 11 and 12. After the needle has passed through this loop of needle thread, the support 20 is again rocked toward the left, the carrier lever 26 being rocked on its pivot to return the spreader points into position above the looper points so that the looper and

spreader points

18 and 24 may again take a loop of needle thread, spread it and present it in position for the passage of the needle therethrough during its next slit stroke.

The mechanism for vibrating or jogging the needle 14 comprises a vertically reciprocating and laterally vibrating carrier sleeve 62 within which the needle bar 64 reciprocates. The carrier sleeve is reciprocated vertically through a bell crank lever 66, the horizontal arm of which is connected by a ball joint with the upper end of the sleeve, and the vertical arm of which is connected by a link 68- with an eccentric on the sewing.

shaft 40; The lower end of the sleeve is moved laterally by a link 70, one end of which is connected to the sleeve, and the other end of which is connected with a pivot.

WVhen the sleeve iswhich is connected to the needle bar by a Since the needle shaft makes two link 78. revolutions for each revolution of the sewing shaft, the needle carrier will be moved to the right during one reciprocation of the needle, and to the left during the succeeding reciprocation, so that the needle will be vibrated or jogged to alternately form the depth and edge or slit stitches.

The rotary head 74 in which the carrier sleeve and needle bar are carried, and the rotary turret 12 in which the looper mechanism is carried, are rotated in unison during the sewing about the eye of a buttonhole through shafts 80 and S2 geared to the head and turret, and operated by connected gear segment levers 84 and 86, one of which is provided With an arm carrying a roll engaged by a cam on the cam shaft of the machine.

While the invention has been shown and described as embodied in a construction in which the opposed looper points are secured in a reciprocating or oscillating support and the cooperating spreader points are secured in a transversely movable carrier mounted on the oscillating support, it will be understood that this nianner of mounting and spreader points is not essential and that the points may be otherwise mounted or may be otherwise distributed or arranged on the support and carrier to secure the relative transverse movements between the spreader and looper points requisite for properly spreading the needle loops taken and carried forward by the looper points. It will also be understood that certain features of the invention are not limited in their application to a machine for sewing a single thread over-seam, but may be embodied with advantage in mechanism for sewing other forms of overseams. It will also be understood that the invention is not limited to the specific construction and arrangement of parts shown and described, but may be embodied in other constructions, the specific construction or arrangement of parts being varied or modified as found desirable or best suited to the machine or mechanism in which the invention is to be embodied.

Having explained the nature and object of the invention and specifically described one form of mechanism in which it may be embodied, what is claimed is 1. A sewing machine having in combination upper needle mechanism, two opposed looper points below the work shaped to enter and carry forward upper needle loops, spreader points mounted to move with the looper points, mechanism for reciprocating the points and for relatively moving the spreader and looper points transversely of their line of reciprocation to carry each needle loop laterally and spread it for the passage of the succeeding needle loop therethrough.

2. A sewing machine having in combination upper needle mechanism, a reciprocating support below the work, a carrier movable with and transversely of the support, two pairs of opposed looper and loop spreader points on the support. and carrier shaped to enter, carry forward and spread each upper needle loop for the passage therethrough of the succeeding needle loop, and mechanism for reciprocating the support and transversely reciprocating the carr1er.

3. A sewing machine having in combination upper needle mechanism, an oscillating support below the work, a carrier mounted to rock on the support about an axis substantially'at right angles to the axis of the support, two pairs of opposed looper and loop spreader points on the support and carrier shaped to alternately enter, carry forward and spread upper needle loops, and mechanism for oscillating the support and for rocking the carrier.

4. A sewing machine having in combination a work clamp, rotary upper needle mechanism, a turret below the work, two opposed looper points on the turret shaped to alternately enter and carry forward upper needle loops, spreader points mounted to move with the looper points, mechanism for reciprocating the points and for relatively reciprocating the spreader and looper points transversely to carry each needle loop laterally and spread it for the passage of the succeeding needle loop therethrough, and mechanism for relatively moving the clamp and sewing mechanism and for rotating the upper needle mechanism and turret to sew about a buttonhole.

5. A sewing machine having in combination a vertically reciprocating and laterally jogging upper needle, two opposed looper points below the work, shaped to alternately enter and carry forward upper needle loops, spreader points mounted to move with the looper points, mechanism for reciprocating the points and for relatively moving the spreader and looper points transversely of their line of reciprocation to carry each needle loop laterally and spread it for the passage of the succeeding needle loop therethrough.

GEORGE S. HILL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0-