US1263767A - Feed-arm mechanism for sewing-machines. - Google Patents

Description

e. HO EPNER. I FEED ARM MECHANISM FOR SEWING MACHINES.

APFLICATION FILED AUG-l5. 1911- w Eaten Apr. 23, mm...

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FEED-ARM MECHANISM F03, SEWING-MACHINES.

Specification of Letters Patent.

Patented a t. as, rare,

Application filed August 15, 1917. Serial No. 186,255.

To all whom it may concern:

Be it known that I, Gnonen Honrnnn, a

citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Tmprovement in Feed-Arm Mechanism for SewingdVIachines, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

The object of the present invention is to produce a simple, efficient and powerful work-feeding means for sewing machines, particularly machines adapted to sew bags and other heavy work.

The various features of novelty whereby my invention is characterized will hereinafter he pointed out with particularity in the claims; but, for a full understanding of my invention and of its object and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawing, wherein:

Figure 1 is a side elevation of a fragment of a sewing machine illustrating the workfeeding arm and the means for actuating the latter;

Fig. 2 is a side view on a somewhat larger scale than Fig. 1 of the work-feeding arm including its actuating block, looking toward the; right from the left hand side of Fig. 3 is an elevation on an enlarged scale of the actuating blocklooking at the side opposite to that which appears in Fig. 2; and

Fig. 4; is a section taken on line 4-4 of Fig. 3.

Referring to the drawing, 1 represents an arm pivotally supported between its ends so as to permit it to oscillate about two axes at right angles to each other; In the arrangement shown, the arm is in the form of an open frame within which is arranged a block, 2, hung upon a pin, 3'. The 'block 2 is secured to some stationary part, 4, of the sewing machine frame by means of a pin, 5, extending at right angles to the axis of the pin 8 through the block. The pins 3 and 5 are fitted in the block so that there may be relative rotary movement, without lost motion, between each of the pins and the block. On one end of the arm is a Workengaging and feeding foot, 6, while adjacent to the other end of the arm is a driving shaft, 7, which extends parallel to the pin 5 and at right angles to the pin 3. The driving shaft preferably extends through the adjacent end of the work-feeding arm which takes the form of a wide fork, 8. In the fork 8 is slidably fitted a block, 9, adapted to move lengthwise of the arm and also transversely of the arm in a plane at right angles to the driving shaft. The block has a round opening, 10, extending through the same and in this opening lies an eccentric, 11, which is fixed to the driving shaft. In the outer end of the block is a slot, 12, in a plane inclined to the axis of the driving shaft and parallel to the axis of the pin 3. Between the outer ends of the arms of the fork 8 extends a cross piece, .13, on which is arranged a roller, 14, lying in the slot 12 and hlaving a diameter equal to the width of the s 0t.

The block is so supported in the machine that it is free to move in any direction in a plane at right angles to the driving shaft but is held against movement in the direction of the length of the driving shaft. This may he accomplished by holding the block-in suitable stationary guides, 15, or by means of suitable collars or shoulders on the driving shaft, or both. In the arrangeinent shown, the eccentric is provided at one end with a collar-like part, 16, through which passes a set screw, 17, adapted to hold the eccentric in place, "While this arrangement'is intended to permit ready adjustment of the eccentric to be made it will be seen that the part 16, if desired, could be made to serve as an abutment to hold the block against movement axially of the shaft. However, since the thrust on the block in the direction of the length of the" shaft is considerable, I prefer to have it resisted by stationary rigid guides.

It will be seen that as the driving shaft revolves the eccentric moves the block through an endless path, such component which is transverse to the longitudinal axis of the arm'serving to produce a swinging movement of the arm around the pin 5, while such component which is in the direction of the length of the arm produces a wedging action on the roller 14: which re sults in a swinging movement of the arm around the pin 3. By giving the-proper throw to the eccentric and the proper angle from the workand carried back out of en- 7 'gagement with the work and finally be brought to the starting point to'take hold of the Work for the next feeding movement.

-While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to'the exact structural details thus illustrated and described; but intend to cover all forms and arrangement which come within the terms employed in the definitions of my invention constituting the appended claims.

I claim:

1. In combination, an arm pivotally supported so as to be capable of swinging about two axes at right angles to each other, a block slidable inone end of said arm, said block having a slot therein in a plane parallel with one of said axes and at an acute angle with the other of said axes, an eccentrio arranged in said block with its axis par- Copies of this patent may be obtained for allel to the last mentioned axis, a part on said arm extending into said slot, and means for turning said eccentric. o

2. In combination, an arm pivotally supported so as to be capable of swinging about two axes at right angles to each other, a block slidable in one end of said arm, said block having a slot therein in a plane lying parallel with one of said axes'and forming an acute angle with the other of said axes, an eccentric arranged in said block with its axis parallel with the last mentioned axis, a

part on said arm extending into said slot, stationary guides cooperating with the block to limit it to movements in a plane at right angles to the axis of said eccentric, and means for actuating said eccentric.

3. In combination, an arm pivotally supported so as to be capable of swinging about two axes at right angles to each other, a block mounted in one end of said arm so as to be movable freely in a plane containing the longitudinal axis of the arm and one of the aforesaid axes and be held against movements transversely to said plane, an eccentric in said block having its axis parallel with the last mentioned axis, said block having a slot lying in a plane arranged at right angles to the aforesaid plane and forming an acute angle with the axis of the eccentric, a roller carried by said arm and projecting into said slot, and means for actuating the eccentric.

4. In combination, an arm pivotally supported so as to be capable of swinging about two axes at right angles to each other, one end of said arm being in the form of a fork having parallel inner faces, a block fitting slidably between and movable freely in all directions across said faces, an eccentric arranged in said block with its axis lying parallel to said faces and parallel with one of the aforesaid axes, said block having a cam face arranged in a plane extending at right angles to said faces and making an acute angle with the axis of the eccentric, a part on said arm engaging with said cam face, and means for actuating said eccentric.

In testimony whereof, I sign this specification.

GEORGE HOEPNER.

five cents each, by addressing the Commissioner of Patents, 'Washington, D. G.

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