US2763225A - Invisible cuff tacker attachment - Google Patents

Description

Sept. 18, 1956 w. E. MENscHlNG 2,763,225

INVISIBLE CUEE TICKER ATTACHMENT Filed July 21, 195s Fig. 2

Wal/er E Mensch/hg 1N VEN TOR.

WWW, H

United States Patenti() INVISIBLE CUFF TA'CK'ER ATTACHMENT Walter E. Mensching, Milwaukee, Wis. Application July 21, 1953, Serial No. 369,388 4 Claims. (Cl. 112-178) This invention relates in general to improvements in sewing machines, and more specifically to an invisible cuff tacker attachment.

The primary object of this invention is to provide an improved invisible cuff tacker attachment for blind-stitch sewing machines of the ltype disclosed in Patent No. 2,250,745, issued July 29, 1941, said attachment permitting the rendering of a feed dog on such a sewing machine inoperative whereby cuffs and the like may be tacked with such a sewing machine.

Another object of this invention is to provide an improved invisible culf tacker attachment which may be` conveniently attached to blind stitch sewing machines whereby the feed mechanism of the sewing machine may be selectively rendered operative or inoperative.l

Another object of this invention is to provide an improved invisible culf tacker attachment for a blind stitch sewing machine which is of a relatively simple construction and of a design whereby the same may be quickly and easily attached to existing blind stitch. sewing machines with a minimum of modcation to such machine.

A further object of this invention is to providean improved adjustable spring connector, the spring connector being of a type whereby the spring may be selectively positioned in one of two positions, whereby the tension thereon may be selectively carried.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a vertical sectional view taken through a conventional blind stitch sewing machine and showsisuch,

a machine provided with the invisible cuff tacker attachment which is the subject of this invention and alternate position of the attachment being shown in dotted lines;

Figure 2 is a fragmentary vertical sectional view taken substantially upon the plane indicated by the section line 2 2 of Figure 1 and shows the general shape of a mounting plate of the attachment; and v Figure 3 is a perspective exploded view of adjustable spring connector means of the attachment.

Referring now to the drawings in detail, it will be seen that there is illustrated in Figure l a conventional blind stitch sewing machine of the type disclosed in Patent No. 2,250,745. The blind stitch sewing machine includes a plate 10, which has associated therewith a curved needle 12. Underlying the plate is a pair of spaced turnable lingers 14 which are pivotally mounted as at 16. The turnable fingers 14 are intended to support portions of a garrnet 18 being stitched and are associated with a feed dog 20 for feeding lthe garment 18 beneath the needle 12.

In order that the left side of each of the turnable lingers 14 may be retained in the proper position, there is pivotally mounted as at 22 a rear body member 24 which has a transverse pin 26 on which there is pivotally mounted a rib member 27. The rib member 27 is connected to an arm 28 of ythe rib body spring 30.

The sewing machine also includes an arm 32 which Iis pivotally mounted as at 34. The arm 32 includes a ,finger 36 which underlies the right side portion of each of the turnable fingers 14 to urge the same toward the feed dog 20. Thearm 32 alsoincludes a lower extension 38 which is normally spring urged to the right by a tension spring 40 which is connected to a work table 42. It will be understood that the springs 30 and 40 retain the turnable fingers 14 in the proper relation with respect to the plate 10 and the feed dog 20 so that the garment 18 being sewed by the needle 12 will be fed through the work area of the sewing machine at the proper rate.

The sewing machine illustrated in Figure 1 also includes other features necessary in the operation thereof, but playing no part in the present invention. Inasmuch member 24 by a 4as these features are clearly illustrated and described in i Patent No. 2,250,745, it is not believed that further description thereof is necessary.

Inasmuch as the turnable lingers 14 are retained in associated relation with the feed dog 20, it will be seen that any garment, such as the garment 18 disposed therebetween will be automatically fed with respect to the needle 12. However, While this type of blind stitching is desired in many cases, in the cases of cuffs on mens pants, and the like, it is desired to place a plurality of stitches in one spot so as to be sure of the tacking and `at the same time limit the area of the stitching. Inasmuch as the feed Vdog 20 would automatically feed the garment through the sewing machine, it will be seen that the sewing machine, as originally manufactured, would not be suitable for tacking of cuffs of trousers and the like. t

`In order that the sewing machine of Figure l may be converted to` be selectively used as a blind stitch sewing machine or as an invisible cuff tacker, there has been provided theinvisible culftacker attachment which is the subject of this invention, the attachment being referred to in general by the reference numeral 50. The attachment 50 `includes a generally rectangular mounting plate A 52, the mounting plate 52 is provided adjacent its upper edge with a pair of apertures 54 through which are rey ceived fasteners 56 which secure'the upper portion of the mounting plate 52 to the work table 42. It will be understood that the mounting plate 52 is secured to a surface of the work table 42 remote from the extension 38 of the arm 32.

The mounting plate 52 is provided adjacent its lower edge with a pair of vertically extending rectangular openings 58. The openings 58 have extending therethrough legs 60 of a U-shaped spring connector member 62. The

r spring connector member 62 also includes a bight portion 64 which passes through a cam member 66. The cam member 66 is provided with an actuating arm 68 to facilitate positioning thereof. Itwill also be noted that the legs '60 are provided with enlarged hinge 70 to facilitate connection thereof to a pair of springs 40.

Inasmuch as the bight portion 64 of the spring connector member 62 is passed through the cam 66 eccentric of the center thereof, it will be seen that the effective length of the legs 60 of the spring connector member 62 may be varied, as is best illustrated in Figure l. When the cam 66 is in the position best illustrated in forward lines in Figure 1, the tension of the spring 48 is to normal tension for the sewing machine in Figure 1 and the turnable fingers 14 will be positioned relative to the feet of 20 in the normal manner and the sewing machine will Operate as originally designed. However, if the arms 68 of the cam 66 is swung to the dotted line position of Figure l the effective length of the leg 60 will be increased Patented Sept. 18, 19545Y 3 with the result that they will move to their dotted line positions. This will reduce the tension on the springs 40 and permit the arm 32 to pivot about the pivot 34 and permit downward movement of the turnable fingers 14.

When the turnable fingers 14,are in their lowermost. po?A positioned relative to the feed dog 20, the extension 38 of the arm 32 is provided with an adjustable stop member 72. The stop member 72 is positioned to engage a portion of the work table 42 and limit swinging ofthe extension 38 tothe right. By adjusting the effective length of the stop member 72, the position of the turnable fingers 14 with respect-to the feed dogs may be selectively varied.

From the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims.

What is claimed as new is as follows:

1. Anattachment for a blind stitch sewing machine of the type having turnable fingers associated with a feed4 dog and a control arm for said fingers, said turnable fingers being urged into positionby a spring; said attachment comprising a mounting plate, an adjustable spring.

connector member, and a cam, said spring connector member being carried by said cam and passing through said mounting plate, said spring being terminally connected to said spring connector member, said cam engaging said mounting plate and positioning saidspring connector member relative thereto, said cam being movable to move said spring connector member through said mounting plate to vary the effective length of said spring.

connector member relative to said mounting plate and selectively render said spring inoperative.

2. An attachment for a blind stitch sewing machine of the type including a turnable finger for supporting material being sewn, a feed dog for feeding material over said turnable finger, a Work table underlying said turnable finger, an arm mounted adjacent said work table, said arm having the intermediate portion thereof carried by a pivot thereby said arm pivots with respect to said work table, said arm having one end engaging said turnable finger to selectively retain said turnable finger in cooperating relation with said feed dog, a spring, said ,spring connecting an opposite end of said arm to said Work table, said spring through said arm spring urging said turnable finger into position with respect to said feed dog; said attachment comprising a mounting plate secura-.

Inasmuch as the cuff' ble to said work table, a spring connector, and a cam, said spring connector being carried by said cam for adjustment relative to said mounting plate, said cam being engaged with said mountingplate and being movable to vary the effect of length of said spring connector member relative to said mounting plate to selectively render said spring inoperative whereby said arm permits said turnable finger to move out of cooperating relation with said feed dog.

3. An attachment for a blind stitch sewing machine of the type including a turnable linger for supporting material being sewn, a feed dog for feeding material over said turnable finger, a work table underlying said turnable finger, an arm mounted adjacent said work table, said arm having the-intermediate portion thereof carried by a pivot thereby said arm pivots with respect to said work table, said arm having one end engaging said turnable finger to selectively retain said turnable linger in cooperating relation with said feed dog, a spring, said springconnecting an opposite end of said arm to said work table, said spring through said arm spring urging said turnable finger into position with respect to said feedldog; said attachment comprising a mounting plate securable to said work table, a spring connector, and a cam, said-spring connector being carried by said cam for adjustment relative to said mounting plate, said cam being engaged with said mounting plate and being movable to vary the effect of length of said spring connector member relative to said mounting plate to selectively renderv said spring inoperative whereby said arm permits said turnable finger to move out of cooperating relation with,y said feed dog, adjustable stop means carried by said arm,and engaged with said work table to limit movement of said turnablel nger towards said feed dog.

4. An attachment for a blind stitch sewing machine of the type hayingturnable fingers, a feedA dog, said turnable fingers beingassociated with said feed dog for positioning .cloth to be sewed relative thereto, a pivotally mounted controlarm having one end engaged with said finger, a spring, connected to the other end of said control-arm pivoting said control arm into engagementwith said turnable fingers to retain.said turnable fingers in cooperating relation with saidfeed dog, said attachment including a mounting plate, an adjustable spring connector member for anchoring said spring remote from said control arm, alcam, said'spring connector member being U- shapedin outlineand having spaced legs connected by a bight portion, said legs freely passing through said mounting plate and havingl terminal ends connected to said spring, said -cam rotatably carrying said bight portion and engaging-said mounting plate, said cam being movable to selectively vary the position of the terminal ends relative to-saidfmounting plate whereby said spring may be selectively rendered inoperative.

References Cited in the file of this patent UNITED STATES PATENTS 52,932 Rehfuss Feb. 27, 1866 2,161,527 Mueller June 6, 1939 2,658,464 Greco Nov. l0, 1953

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