US889119A - Feed mechanism for sewing-machines. - Google Patents

Description

PATENTED MAY 26, 1908. G. F. & M. T GOFORTH. FEED MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JUNE 24,1907.

Z SHEET8SHEET 1.

. WITNESSES A TTOR/VE VS No. 889,119. PATENTED MAY 26. 1908.

G. E. & M. T. GOFORTH.

FEED MECHANISM FOR SEWING MAGHIN BS.

APPLICATION FILED JUNE 24,1907.

2 SHEETS-SHEET 2 f/VVE/V row A TTO/V/VE V5 UNITED STATES PATENT OFFICE CHARLES F. GOFORTH AND MARSHALL T. GOFORTH, OF WIOHITA, KANSAS.

FEED MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented May 2c, 1908.

Original application filed November 20, 1906, Serial No. 344,296. Divided and this application filed June 24, 1907. Serial No. 380,525.

. anism for Sewing-Machines, of which the following is a specification.

This invention relates to sewing machines,

and hasfor its principal object to provide afour motion feed in which the number of parts is reduced to a minimum, and in which there will be no back motion feed in case of reversal of the direction of the rotation of the main shaft, the feed block always feeding from the operator without regard to the direction in which the operating shaft rotates.

A further object of the invention is to provide a feed block operating mechanism of very simple construction and which may be adjusted with the utmost accuracy for changing the number of stitches per inch as desired.

A still further object of the invention is to provide a feed mechanism that is especially adapted for use in connection with double pointed shuttle machines, that is to say, machines in which two complete stitches are formed during each complete oscillatory or reciprocatory movement of the shuttle.

With these andother objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be made Without departing from the spirit or sacrificing any of the advantages of the invention.

In'the accompanying drawings :Figure 1 is an end elevation of the lower portion of a sewing machine having a feed mechanism constructed in accordance with the invention. Fig. 2 is a bottom plan view of the machine.

Fig. 3 is a transverse section on the line 3-3 of Fig. 1. Fig. 4 is a detail perspective view of the main carrying plate of the feed block. Fig. 5 is a similar View of the main operating cam and arm of the feed block mechanism. Fig. 6 is a similar view of the lever in transmitting movement to the feed block carrier. Fig. 7 1s a similar view, parts being shown in section, of the adjustable swiveled block for connecting the operating levers or arms of the feed block mechanism. Fig. 8 is a detail perspective view of the carrying arm of the swiveled block.

Similar numerals of reference are employed to indicate corresponding (parts throughout the several figures of the rawmgs.

This application is a division of an application for Letters-Patent filed by us on Nov. 20, 1906, under Serial No. 344,296.

The lower face of the base plate of the machine is provided with bearings for a feed motion rock shaft 90 that is provided at one end with a rocker arm 91 having an adjustable connection with a rod 92 that extends up through the goose neck, and is operated in any suitable manner.

At the forward end of the rock shaft is secured a cam 95 and an arm 96, these being preferably formed integral, or being rigidly secured together, and adjustably secured to the end of the rock shaft. The cam imparts vertical movement to the feed block, while the arm 96 serves for the transmission of-an endwise movement thereto, the feed block being of the four motion type and making one complete cycle of movements for each reciprocation of the needle bar.

From the lower face of the base plate depends a bracket 99 on which is pivoted a bell crank lever, the construction of which is more clearly shown in Fig. 6. This lever has an approximately horizontal arm 100, and an approximately vertical arm 101, the latter arm being arranged to play between two lugs 102 and 103 on a feed block carrying late 104. Secured to the plate 104 is the cod block 105, the block being slotted for the passage of a securing screw 106, in order to permit vertical adjustment of the block in assembling the parts. The forward end of the plate 104 is provided with an elongated slot 106 which receives a pin or stud 107 that extends across the space between a pair of guides 108 that are secured to or formed integral with the base plate, these guides serving to prevent lateral play of the plate 104.

In the rear end of the plate 104 is a rectangular opening 109 which receives the approximately triangular cam 95, and as this cam is rocked, the rear end of the plate 104 will be alternately raised and lowered with the pin or stud 107 as a pivotal center, and. at

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the same time the plate will be free to move in the direction of its length for the purpose of accomplishing the feed, this latter movement being imparted to the plate by the engagement of the arm 101 first with the lug 102, and then with the lug 108.

The arm 96 and the arm 100 are connected together by a swivel block of the character best shown in Fig. 7. This block is formed of two sections 111 and 112, the latter being provided with a flanged disk 113 which receives a somewhat smaller disk 114 that is formed integral with the section 111 and the two parts are held together in such manner as to prevent lateral movement, while they are free to turn with respect to each other. The section 111 has an opening 114 for the passage of the arm 96, and the section 112 has a, similar opening 115 for the passage of the arm 100, so that if the arm 96 is rocked, its movement will be transmitted through the arms to the arm 100, and the extent of movement may be varied by adjusting the swiveled block along the lengths of the two arms. For this purpose the flange 113 fits within an opening formed in an arm 117 which extends toward the front of the machine, and is connected to a crank arm 119 on a rock shaft 120 that is adapted to suitable bearings depending from the base plate. This rock shaft extends along to a point in front of the goose neck, and is provided with an upwardly directed arm 121 that extends through an opening 122 in the base plate, and by moving this arm the arm 117 may be moved back and forth for the purpose of altering the position of the swiveled block, and by varying the point of connection with the arms 96 and 100, the extent of movement of the feed block will be varied, and the number ofstitches per inch adjusted as required. The arm 121 is preferably arranged adjacent to a graduated disk, so that the operator may effect the desired adjustment with certainty.

We claim 1. The combination with a sewing machine, of a feed block, a carrying plate therefor said plate being slotted at one end and provided at its opposite end with an approximately rectangular recess, a supporting pin extending through the slot, a triangular cam fitting within the recess, a rock shaft carrying said cam, an arm extending from the rock shaft, a bell crank lever, one arm of which is connected to the rocker arm, and means engaging the opposite arm of said bell crank lever with the plate.

2. The combination with a sewing machine, of a feed block, a carrying plate therefor, a rock shaft, a cam arranged on the rock shaft and serving to impart vertical movement to the plate, a rocker arm also carried by the shaft, a bell crank lever, means for connecting one arm of the bell crank lever to the rocker arm, and means for imparting movement from the second arm of the bell crank lever to the carrying plate.

3. In a four motion feed, the combination with a feed block, of a feed block carrier, means for imparting vertical movement to the feed block carrier, a rock shaft, a rocker arm therefor, a bell crank lever, an adjusting means connecting one arm of the bell crank lever to the rocker arm, and means for transmitting movement from the second arm of the bell crank lever to the carrier.

4. The combination with a sewing machine, of a feed block, a feed block carrier, means for imparting vertical movement to the carrier, a rock shaft, a rocker arm thereon, a bell crank lever, an adjustable means connecting one arm of the bell crank lever to the rocker arm, there being a pair of lugs on the carrier, between which the second arm of the bell crank lever is arranged to oscillate.

5. In a sewing machine, a feed block, a feed block operating member including a pair of arms, a swiveled connection comprising a pair of blocks pivotally connected together, and having openings for the passage of the arms, and means for adjusting such swivel connection in the direction of the length of the arms to vary the length of the feed.

In testimony that we claim the foregoing as our own, we have hereto afiixed our signatures in the presence of witnesses.

CHARLES F. GOFORTH. MARSHALL T. GOFORTH. I/Vitnesses:

CHAS. G. YANKEY, G. C. WVHITLOOK, A. T. HELLAR.

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