US2414227A - Sewing machine - Google Patents

Description

Jan. 14, 1947. 1 c. GOFORTH SEWING MACHINE Filed June 4, 1942 3 Sheets-Sheet l a. F. 6' ya rZ-k, INVENTOR.

3 Sheets-Sheet 2 c. F. GOFORTH SEWING- MACHINE Filed June 4, 1942 Mum Jan. 14, 1947..

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C. F. GOFORTH SEWING MACHINE Jan. 14, 1947.

3 Sheets-Sheet 3 Filed June 4, 1942 Patented Jan. 14, 1947 UNITED STATES PATENT OFFICE I EWIN CH E Charles F. Goforth, Wichita, Kans.

Application June 4, 1942, Serial No, @5383 1 Claim. 1

invention relates to sewing machine construction, an important object of the invention being to provide a sewing machine including'an oscillating member, GOhStILlfibfid to operate in a horizontal plane and used in lieu of the usual well known loop taker.

Another object of the invention is to provide an oscillating thread-engaging member having oppositely disposed thread hoolgs, so arranged that regardless of the direction of the initial movement of the hand wheel of the sewing machine by the operator, one of the thread hooks will be in a position to pick up the loop in the thread, formed by the needle of the machine in passing through the material being sewed, and carry the loop to a position around the bob-bin thread, in forming a stitch, thereby eliminating improperly formed stitches which usually occur by starting the hand wheel in the wrong direction.

With the foregoin and other objects in view which Will apnear as the d l o eeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings;

Figure 1 is a longitudinal sectional View through a sewing machine constructed in accordance with the invention.

Figure 2 is a bottom plan view thereof.

Figure 3 is a sectional view taken on line 33 of Fi ur 1.

Figure 4 is a sectional view taken on line 4-4 of Figure 1.

Figure 5 is a bottom plan View of the oscilf ttin uble hook m r- Figure 6 is an elevational View of the oscillating member and bobbin case mounted thereon.

' Figure 7 is a vertical sectional view through the oscillating member and bobbin case.

Figure 8 is a view illustrating the initial position of the needle thread loop, with respect to the bobbin thread.

Figure 9 is an elevational view of the machine head cover plate.

Referring to the drawings in detail, the referby a suitable belt not shown, moving over the pulley 8,mountedthereon.

In the head 9 'of the sewing machine is located the usual vertically movable needle bar Ill that carries the needle H. The power shaft 1 trans mits movement to the needlebar to, through the crank arm l0 mounted on one end of the power shaft, the crank arm bein connected with the linl; Ii, that in turn connects with the-needle bar l0 through the collar l2 and stub shaft 13'.

Qperating adjacent to the needle bar, is the presserefoot bar I2. On the lower end of the bar i2, is mounted the presser-foot l3 which cooperates with the feed mechanism of the machine in moving the material being sewed, through the machine.' Operating between the arms of the member I4, is an eccentric 16', that is secured to one end of the power shaft 1, where by rotary movement of the power shaft 1 is con verted intoreciprocatorymovement of the needle bar l0 and take-up bar516. Secured'on the shaft 1 is a sleeve !4 on one end of whichis mounted a pinion I5, the opposite end of the sleeve Hi carrying the disk 34 over which the eccentric I 6, to be hereinafter more fully described, operates.

Adjustable bearings H and 18 extend into depressions formed in the hub l9 of the member A 20, so that the member 29 may berotated freely on the adjustable bearings. A gear indicated at 2| is formed at one end of the member 2|] and meshes with the pinion I5, whereby rotary movement of the power shaft 7 is transmitted to the member 28. Formed in the periphery of the member 20, is a cam groove 22 into which the pin 23 extends/the pin 23 being carried at the upper end of the pivoted arm 24 which is supported at a point substantially intermediate its ends, by the mounting 2.5. The lower end of thearm 24 extends through an opening in the supporting table 5, and terminates at a point below the table 5 as clearly shown by Figure 1 of the drawings. Pivotally connected to the lower end of the arm 24, is a rack bar 25 that engages the segmental gear 21. This segmental gear'2l is secured to the tubular bearing member 29 that is secured to the shaft 30, the bearlng member 29 being mounted in bearings seated in the bracket 28. The shaft extends from the center of the oscillating double-pointed 'hook member 3! which operates in a horizontal plane directly under the needle and presser-foot of the machine.

This double-pointed hook member 3! is of a novel construction, and embodies a disk-like member formed of suitable sheet metal material, the peripheral edge thereof being turned upwardly and inwardly as clearly shown by Figure 5 of the drawings, providing a flange 32. A portion of the flange 32 is cut away providing spaced hooks 33 at the ends thereof, the hooks 33 being disposed in opposite directions with respect to each other, providing thread hooks that are designed to hook into loops formed in the thread, by the needle of the machine, in carrying the needle thread around the bobbin thread.

The flange 32 rests in the annular groove 32', formed in the periphery of the bobbin case 33' supporting the bobbin case on the hook member 3|. A flange 34' forms a part of the bobbin case and has a cut-out portion 35 through which the needle of the machine extends in forming the stitch. In order that the bobbin case will be held against rotary movement, a pin 35' is provided and extends downwardly from the lower surface of the table 5, terminating at a point above the hook member 3|. It will of course be understood that the double-pointed hooks and the operation of the same is such that regardless of the direction of oscillation in which the of the pivoted arm 24 which in turn operates the rack bar 25 to oscillate the double-pointed hook member and cause the double-pointed hook member to cease oscillation for a predetermined period, prior to the starting movement of the member 3| in the reverse direction.

Mounted on the power shaft l, to move there with, is an eccentric, which embodies a disk 34 and eccentric band 35, the band 35 being secured to the upper end of the arm 35 mounted in one end of the sewing machine. The arm 36 is pivotally secured to the link 38, through the pin 31, the link 38 having an elongated opening, as clearly shown by Figure 4. This link 38 is pivotally mounted on the shaft 39' secured Within the machine housing.

Mounted within the sewing machine, is an arm 38 on one end of which the roller- 39 is mounted, the roller moving through the elongated opening, so that movement of the pivot arm 36, results in a relative movement of the arm 38'.

Thus it will be seen, that due to this construction, the position of the roller 39 within the elongated opening, may be adjusted longitudinally thereof, to vary the throw of the arm 38.

The adjustment of the arm 33' withrespect to the link 38, is accomplished by the operation of the lever 40', which is extended through an opening in the sewing machine, there being provided a link 4| connecting the lever 4|! with the arm 38 so that as the lever is swung on its pivot, the roller 39 is moved longitudinally of the link 38.

This arm 38' has connection with the arm 42 that in turn is secured on the shaft 43 mounted under the sewing machine table.

This shaft 43 extends throughout the length of the sewing machine, and carries the feed bar operating mechanism 44 at one end thereof. Mounted directly under the sewing machine, is the feed bar 45 that has teeth 46 near the free end thereof, the teeth being adapted to cooperate with the presser-foot, in feeding material being sewed, under the needle.

One end of the bar 45 is forked at 45 and accommodates the pin 46', whereby the bar 45' is permitted to reciprocate under the table 5 of the machine.

This feed bar 45 includes an arm 49 extending upwardly towards the presser-foot I3, the serrated end 55 thereof cooperating with the presser-foot i3 in feeding material through the machine. Thus it will be seen that when the machine is in operation and the shaft 43 is rotated backwardly and forwardly substantially a quarter turn in each direction, the feed arm 49 is operated to feed the material through the machine. In order that the feed mechanism may be adjusted, the lever 40' may be operated to move the arm 38' to various positions within the elongated opening of the right-angled end portion of the arm 38, thereby adjusting the length of throw of the arm 38 with the result that the sewing machine may be adjusted for making a substantially long stitch as in basting. By moving lever 40 to the limit of its upward movement the feed is reversed, since the movement of the arm 38, shifts the roller to the opposite end of the elongated opening, or to-the position as shown in dotted lines in Fig. 4 of the drawings, with the result that downward movement of arm ,36 moves the arm 38 downwardly instead of upwardly, as would be the case when the roller 38 is positioned in the opposite end of the elongated opening.

The cover plate for the head of the sewing machine, is indicated by the reference character 5|, and is formed with a notch 53 at one corner thereof, through which the top thread or thread from the spool of the machine extends. The cover plate 5| also provides a support for the top thread-tensioning device which embodies a spring plate 52 secured to the cover plate 5|, by means of the set screw 54. Hook 55 forms a part of the thread-tensioning device, under which the thread passes from the notch, the thread passing upwardly from the hook 55 and through the eye in the arm 55 which extends through an elongated opening in the cover plate. This arm 56 is formed with a pivoted end 56 which is normally held in an extended position by the spring 51 mounted adjacent to the pivot point between the pivoted end and arm 56. This pivoted end moves downwardly when the thread becomes exceptionally taut, thereby preventing breaking of the thread due to lack of resiliency at the point of contact between the thread and arm. From the arm 56, the thread passes downwardly to the needle.

From the foregoing it will be seen that due to the construction of the double-pointed hook 3|, the hook will pick up the needle thread in forming the stitch, regardless of the direction of oscillation in which the hook is started, thereby insuring against an improperstitch. It will also be seen that by adjusting the lever 40', the length of the stitch may be regulated, to the end that long stitches may be made, as in basting, and by throwing the lever 40' from the top to the bottom it reverses the feed and vice versa.

On forming a stitch, the threaded needle passes downwardly through the material being sewed, and through the cut-out portion in the flange of the bobbincase, forming a loop A as shownby Fig. 8 of the drawings. The hook at one end of the cut-away portion of the member 3|, depending on the direction of rotation of member 3|, moves into the loop spreading the loop and, carrying the thread at one side of the loop over the beveled upper edge of the bobbin case, the thread at the opposite side of the loop passing under the lower edge of the bobbin case, the thread moving through the space K between member 3| and bottom of the bobbin case, until the loop moves from the position shown at C in Fig. 5 of the drawings, to the position 9, whereupon the tensioning means or arm 56, operate-s to draw the thread taut, causing the thread to slide over the edge of the bobbin case and loop around the bobbin thread B, forming the stitch. This operation is repeated in forming a line of stitching as in sewing.

What is claimed is:

In a sewing machine, a body portion, a power shaft within the body portion, a reciprocatory needle Within the body portion operatively connected with said shaft, underthread mechanism supported by said body portion and including a circular bobbin case having an annular groove formed in the periphery thereof, a disk-like member disposed under the bobbin case, the edge of the disk-like member being turned upwardly and inwardly, providing a flange disposed within said annular groove and connecting the disk-like member and bobbin case, a portion of the edge of the disk-like member being cut away providing hooks disposed in opposite directions, at the ends of the cut-away portion, means operative by said shaft for oscillating the disk-like member whereby said hooks are alternately engageable with a needle thread loop delivered below the bobbin case by said needle in forming a stitch.

CHARLES F. GOFORTH.

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