US1178988A - Feeding mechanism for sewing-machines. - Google Patents

Description

J. BERGER, JR.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION men JAN. n. ma.

Patented Apr. 11, 1916.

2 SHEETS-SHEET I.

J. BERGER, Jn.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JAN- II, 1913.

1,178,988. Patented Apr. 11,1916.

2 SHEETS-SHEET 2.

- Jaye/22%;.

n STATES. PATENT onion.

JOSEPH BERGER, JR., OF UTICA, NEW YORK, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed January 17, 1913. Serial No. 742,686.

T 0 all whom it may concern:

Be it known that I, JOSEPH BERGER, Jr., a

citizen of the United States, residing at Utica, in the county of Oneida, State of New York, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon. My invention relates to feeding mechanism for sewing machines, and particularly to a machine used in sewing a binding strip upon a knitted fabric when binding across the wales of the fabric, in which event unless the knittedfabric is fed slightly faster than the binding strip the former is liable to become stretched or distorted in the stitching operation.

It is sometimes desirable when stitching one piece of fabric to another of the above character, to cause the fulling action of the mechanism to cease, as for example, when crossing stay strips and the like. Two different types of differential feeding mecha nism for accomplishing this result have been devised, one in which the differential feed dog is thrown into unison with the main feed dog when occasion demands, and the other in which the differential feed dog is thrown out of effective cooperative relation to the fabric; and it is to the latter type of machine that the present invention especially relates.

In such a machine, when the forward or auxiliary feed dogis, by the treadle-controlled mechanism, dropped below the fabric to render it inefi'ective, then the work passing into the machine will not be carried underneath the presser foot and up to the needle, for there is no engagement of feed dog ahead of the presser foot withthe goods.

The object of my invention is to over-.

drawings, in which- Figure l is an end view partly in section of a portion of a sewing machine embodying my invention, both feeds being shown raised, the forward feed being shown in effective position with respect to cooperation with the rear feed; Fig. 2 is a detail view of the feed dogs and means for throwing the forward feed dog into and out of operation; Fig. 3 is a plan view of the feeding mechanism; Fig. 4 is a detail view of the treadle-controlled lever which operates the forward feed dog; Fig. 5 is an end view, the forward feed being inactive; Fig. 6 is a similar view, showing both dogs raised, and illustrating the relative positions of the main dog extension; Fig. 7 is a side view of the parts positioned as in Fig. 5;. and Fig. 8 is a side view of the parts positioned as in Fig. 6.

In these drawings I have shown a portion of a sewing machine of the well known Union Special type, the bed plate being shown at 1, the cloth plate at 2, the throat plate at 3, needle at 4:, presser bar at 5, main shaft at 6 and the feed-operating eccentric at The main feed dog is shown at 8 and the auxiliary feed dog at 9. Upon the forward end of the auxiliary feed bar 16 is formed or attached a head 17 having a socket 18 formin a seat for a spring 19, attached at one en to the plate or bar 20, which carries the feed dog 9. Said bar has also a downwardly extending flattened. portion 21, dovetailed in a groove 22 in the head 17, and projecting through said head is engaged by the forward end of a lever 23, pivoted at 24 to an extension 25 of the lug 26 on the auxiliary feed bar, to which lug the pivotal link 27 is attached to impart the differential movement to the auxiliary feed bar. This lever partakes of the rising and falling and forward and backward movements of the auxiliary feed bar, and the spring 19 keeps the feed dog 9 in position of normal action at the usual times on the fabric.

It will be noted from the arrangement of parts that when the rear end of the lever 23 is raised, the forward end will draw down on the part 21 and draw the feed dog '9 out of effective engagement with the fabric, thus causing all the work of feeding to be performed by the main feed dog.

Pivotedat 28 is a lever 29 to which at one end is attached a chain 30, connected to a spring treadle, and the opposite end 32 extends beneath the rear end of lever 23, so that when the end 32 is raised by drawing down on the oposite end, it will force up the rear end of lever28, and draw down feed dog 9. Upon release of lever 29 it will return to normal position, and allow the spring 19 to return the feed dog 9 to operative position.

The parts thus far described are of well known construction, and the present invention is designed to overcome the defect heretofore referred to, that when the forward feed dog is dropped down out of the 'way,

there is no feed for the material ahead of the needle to carry the work underneath the presser foot. To obviate this defect, the feed dog 9 is slotted or cut away at 10, and an extension 11 of the main feed dog is extended over into said s'lot, so that when the dog 9 is dropped to inefi'ective position, the extension 11 will still bear upon the material and aid in the feeding action carrying it underneath the presser foot. The forward feed dog is arranged to rise slightly higher than the main feed dog, so that when the forward feed dog 9 is hearing on the material, the latter is lifted from the extension, of the main feed dog and will not be engaged by said extension. This is shown in Figs. 1, 6 and 8 of the drawing which show the feed dogs both in operative positions.

It will be understood that minor modifications may be made, without departing from the spirit of my invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A sewing machine feeding mechanism including a main feeding device, an auxiliary feeding device, and means for moving the auxiliary feeding device to ineffective position without stopping the main feeding device, said main feeding device having a portion extending into the region containing the auxiliary feeding device whereby when the said auxiliary feeding device is moved to ineffective position said extension of the main feeding device will engage and feed the fabric.

2. A sewing machine feeding mechanism including a main feed dog, an auxiliary' 1,17s,ess

eration.

4. A sewing machine feeding mechanism including main and auxiliary feed dogs, and means for throwing the latter out of effective action on the fabric, said auxiliary feed dog having a longitudinal opening between its toothed surfaces, the main feed dog having a toothed surface extending into said opening and engaging the fabric when the auxiliary feed dog is thrown out of operation, said extending toothed surface in its working position being-on a lower level than the feeding surface of the auxiliary feed dog when the latter is in working position.

A sewing machine feeding mechanism including a main feeding device, an auxiliary feeding device, means for shifting the auxiliary feeding device without stopping the movements of the feeding devices to render the feeding action thereof ineffective, and a normally inefiective fabric engaging device for engaging and feeding the fabric in advance of the needle when said auxiliary feeding device is rendered ineffective.

6. A sewing machine including in combination a work support, feed dogs arranged side by side, means for giving said feed dogs a differential movement, and means whereby said feed dogs are alternately rendered ef fective and ineffective without stopping the feed dogs.

7. A sewing machine including in combination a work, support, feed dogs located beneath the work support and projecting through the same to engage the fabric, said feed dogs having fabric-engaging'surfaces arranged side by side, means for giving the feed dogs a differential feeding movement, and means for changing the relative heights of the feed dogs when in raised position and without stopping the movements of the feed (logs whereby first one feed dog and then the other is rendered effective to engage and feed the fabric.

8. A sewing machine including in combination a work support, a feeding mechanism having a fabric-engaging surface in rear of the needle, and fabric-engaging surfaces in advance of the needle, said fabricengaging surfaces in advance of the needle being given a differential movement relative to each other, and means for varying the relative heights of the feed engaging sur- In testimony whereof I afiix my signature faces When in raised position in advance of in the presence of two Witnesses. the needle and without stopping the move- JOSEPH BERGER, JR. ments of the feed engaging surfaces whereby Witnesses:

5 first one feed engaging surface and then the CHAS. B. MAsoN,

other is-rendered effective to feed the fabric. A. DQELDRED.

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