US1879190A - Throw-out feed-lift mechanism for sewing machines - Google Patents

Description

Sept. 27, 1932. H J GQOSMAN 1,879,190

THROW-OUT FEED LIFT MECHANISM FOR SEWING MACHINES Filed May 22, 1931 gmw/nhw Herbefz J G'oosman Patented Sept. 27, 1932 UNITED STATES PATENT OFFICE HERBERT J'. GOOSMAN, OF ELIZABETH, NEW] JERSEY, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY THROW-OUT FEED-LIFT MECHANISM FOR SEWING MACHINES Application filed May 22, 1931. Serial No. 539,158.

For certain operations with household sewing machines, such as embroidering and darning operations, it is desirable to render the usual four-motion feed-dog inefiective so I that it will not engage the work. This has heretofore been done in various ways including a provision for uncoupling the feed-bar lifting arm from its actuating rock-shaft.

The present improvement has for an object 10 to provide a simplified means for efiecting the disconnection of the feed-bar from the feedlift mechanism for embroidering and darning operations or the like.

A further object of the invention is to pro- 1 vide for the secure clamping of the shiftable parts of the mechanism in working position or in disconnected position, to avoid the evils of lost-motion and accidental displacement of the parts.

a The invention comprises the devices, combinations and relative arrangements of parts hereinafter described and claimed.

The features of the invention and the advantages attained thereby will be readily understood by those skilled in the art from the following detailed description of a preferred embodiment of the invention illustrated in the accompanying drawing in which Fig. 1 is a transverse vertical section through the bedplate of a sewing machine, showing. the feedbar and associated parts in elevation. Fig. 2 is a bottom plan view of the parts. Fig. 3 is a section on the line 3-8, Fig. 1. Fig. 4 is a section on the line 44, Fig. 1, and Fig. 5 is a disassembled perspective view of the feed-lift arm and parts carried thereby.

1 represents the sewing machine bed below which is mounted, in the usual manner, the feed-advancing rock-shaft 2 and feed-lift rock-shaft 3. The feed-advancing rock-shaft 2 is formed with the usual spaced upstanding arms 4, 4 carrying the pintles 5, 5 which pivotally support the transversely extending rearward end-portion 6 of the feed-bar 7 carrying the usual four-motion feed-dog 8. The feed-dog 8 works (through the usual slotted throat-plate 9 the upper surface of which is substantially flush with the bed or cloth-plate 1 of the machine and is formed 50 with the usual hole 10 through which the reciprocating needle (not shown) descends for cooperation with the oscillatory shuttle 11 or other suitable loop-taker. The feed-lift rockshaft 3 has fixed to it the feed-lift arm 12 formed at. its rearward free end with an aper-' ture 13 parallel to the axis -of the shaft 3.

The arm 12 is also formed with a slot 14 opening into one side of the wall of the aperture 13. v i

There is mounted in the aperture 13 of the arm 12 a slide-bolt 15 carrying at one end an anti-friction roller 16 adapted to enter the slot 17 in the forwardly disposed forked end of the feed-bar 7. The manually operated clampin screw 18 has its shank passed through the slot 14 in the arm 12 and is threaded into the slide-bolt 15 so that the screw 18 may be tightened to clamp the slide bolt 15 firmly to the arm 12 with the roller 16 in the slot- 17 in the feed-bar.

When it is desired to use the sewing machine for embroidering or like operations, the operator loosens the screw 18 and shifts it to the other end of the slot 14, thereby sliding the bolt 15 from full line position, Fig. 2, to'* dotted line position, in which the roller 16 is disconnected from and is entirely out of engagement with the slotted end of the feedbar 7 The clamping screw 18 is securely tightened in its dotted line position, Fig. 2, 7

thereby avoiding accidental reengagement of the slide-bolt 15 with the feed-bar 7 When the feed-lift roller 16 is disconnected from the feed-bar, the latter drops to dotted line position, Fig. 1, and reciprocates idly in such-' position; the feed-dog resting upon the top of the shuttle race 19 with the feed-dog teeth well below the upper surface of the throat-plate 9.

Reconnection of the feed-lift mechanism for regular straightaway sewing operations is readily effected by restoring the slide-bolt 15 from dotted line to full line position, Fig.

chines, the combination with a feed-bar having a slotted end, means for imparting feedand-return movements to said feed-bar, and means for imparting rising and falling move- 5 ments to said feed-bar, said last mentioned means including a rock-shaft, a feed-lift arm fixed to said rock-shaft, and a coupling ele-. ment carried by and shiftable relative to said feed-lift arm into and out of direct working Engagement with the slotted end of said feed- 2. In feeding mechanism for sewing machines, the combination with a feed-bar having a slotted end, means for imparting feedand-return movements to said feed-bar, and

means for imparting rising and falling movements to said feed-bar, said last mentioned means including a rock-shaft, a feed-lift arm fixed to said rock-shaft, a coupling element carried by and shiftable relative to said feed- Vlift arm into and out of working engagement with the slotted end of said feed-bar, and means for clamping said element to said feedlift arm in either engaged or disengaged position relative to said feed-bar.

3. In feeding mechanism for sewing machines, the combination with a feed-bar, means for imparting feed-and-return movements to said feed-bar, and means for imparting rising and falling movements to said feed-bar, said last mentioned means including a rock-shaft, a feed-lift arm fixed to said rock-shaft and formed with an aperture parallel to the axis of said rock-shaft and with a slot in the side wall of said aperture, a slidebolt mounted in said aperture for endwise movement to carry one end of such bolt into or out of engagement with said feed-bar, and a clampscrew passing through said slot and threaded into said slide-bolt for clamping the latter to said feed-lift arm in either engaged or disengaged position relative to said feedbar. 7

In testimony whereof I have signed my name to this specification.

HERBERT J. GOOSMAN.

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