US1789704A - Tucking attachment for sewing machines - Google Patents

Description

Jan. 20, 1931. e. w. JOHNSON ET AL I 1,789,704

TUCKING ATTACHMENT FOR SEWING MACHINES Filed oct. 31. 1927 -2 shdatas'hen 1 George Womal Jbhnson Henry Clog T zuslow INVENTORS WM au m, ATTORNEY.

Jan. 20, 1931. G, w, JOHNSON ETAL 1,789,704

TUCKING ATTACHMENT FOR SEWING MACHINES Filed Oct. 31, 1927 2 Shoots-Shoot 2 George Wornal Johnson Henry Clay Truslow v lNvENToRs W ATTORNEY.

Patented Jan. 20, 1931 I UNITED ST ES j ,1,789,704 fE GEORGE WOBNAL .iormson ANlD HENBY CLAY rnusnow, on NEW Yonm imYYl As-l SIGNORSTOJQSEPE w. JOHNSON, OF NEW YORK, N. Y. 1

TUck vehrTAcHi/mnu non SEWING MACHINES Application filed 0ctober 81,11927.. Serial no. 229,969.

This invention relates to sewing machines" and particularly to that class of devices which are adapted to form tucks or plaits incloth, and our invention has for its object to provide a tucking device by means ofjwhich" means of the attachment hereinafter de-' scribed and claimed and illustratively exemplified 1n the accompanymg drawings, in

' which, Figure 1 is a plan view of a section of material provided with our improved shell tucking; Figure 2 is a perspective view of a portion of a sewing machine and attachment; Figure 3 is aplan view of the same; and Figure 4 is a substantially longitudinal sectional view of our attachment taken on lines 4'4 of Figure 3.

Referring to the drawings 10 denotes the arm of a sewing machine and 11 the bed plate thereof. The arm 10 carries a presser bar 12 at the lower end of which is secured the presser foot 13. Carried by the arm 10 in advance of the presser bar 12 is the usual needle bar 1 1 from which depends a needle 15 adjusted to reciprocate in an opening 16 disposed in the presser foot 13, the opening 16 being in communication with one side of the foot 13 through a slot 17. The slot 17 is disposed transversely with respect to the axis of the lateral portlon of the foot 13 and projects from the opening 16 slightly in advance of the center thereof. Leading into the slightly upturned nose of the foot 13 is the delivery end of a tucking or folding attachment 18 of any well known type utilized for the purpose of forming and leading the material in folds into the path of the reciprocating needle 15. The apparatus thus far briefly described with the exception of the slot 17 is common to sewing machines and tucking attachments now in use.

Mounted on the bed plate 11 beneath the arm 10, is a plate 19, which is fixed in position by means of thumb screw 20, and which is provided with two spaced upstanding guide blocks 21. The blocks 21 have radial openings 22 disposed so-as to coincidewith a common axis which projects directly 'over the longitudinal axis of the slot 17. The

openings22 accommodate a reciprocatingbar 23wh1c'h comprises amet'al wire, round in cross section and provided with a downwardly. curved gatherer or nose 24 at its xtreme needleward end. This nose is flattened on both sidesand its tip is intended to" reciprooate in the slot 17 of the foot piece 13 and in advance of the upright path ofthe needle 15. The portion of the bar 23 projecting through the openings 22 of the guide blocks is necessarily straight, but beyond the latter the wire is bent upwardly at right angles and then at right angles again in a rearwardly direction. Reciprocal motion'is imparted to the bar 23 by contact with a pin 25' depending from a disc 26 which rotates with the operation-of the machine through an up- 1 rightfshaft 27 carrying thedisc 26 and a needle bar actuating or'main shaft 281mclosed within the arm 10. The shaft 27 and worm gear connection(not shown) to the V ments for working on materials being stitched by machine. Rotary movement of the pin 25 will push the bar 23 in the direction of the needle but the bar is withdrawn by means of a spring'connection 29 attached at one end to a'fixed portion of the machine while the other end embraces a portion of the reciprocating bar itself. l f

The operation of theinvention is as" follows :The material to be worked is introduced into the tucking device in the well known'manner, which requires no explana tion here, and asa consequencethe folded portion approaches the :needle bar and foot so. as to bring the crease of the under foldof jthetuck. being formed directly in line with the path of the needle which under ordi According to the present inventionitis con-.

templated to feed and fold the-tuck in the v manner just briefly described, but as the V the needle.

folded material forming the tuck is drawn under the foot piece 13 and into the path of theneedle 15 the latter forms only a certain number of stitches, in the present instance six are provided, which catch the material in the usual way, i. e. straight along the creaseof'the under foldand through the upper layer-forming the faceof the tuck. At

this point in the operationfof' the machine the disc 26 and pin 2-5 have rotated until the bar 23 has crowded the nose- 24 against the free edge of the tuckbeing formed and held beneath the shoe 13, the material as a consequence having become gathered up to a point past the needle as the nose continues to advance through the slot 17 in front of The needle 15 then descends to pick up its next stitch which catches over the edge of the tuck in its gatheredconditionand fastens its position. A. second oper-' ation of the needle and a second stitch is taken as illustratively exemplified in Figure 1, before the nose is withdrawn from the slot 17 and'the material allowed to proceed under 7 normal tucking conditions for the succeeding six stitches. It will be clear thatthe tuck between'its gathered points will assume an outwardly curved shape, giving it the very desirable scollop or shell appearance. 7

Other apparatus designed to accomplish 1 the same purpose as that attained by the present invention, are built into the sewing has machines and because of the more or less complicated nature ofthe devices, tend to' upright path of movement of the needle 15.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent is 2-- 71. In a tucking device for a sewing machine, the combination of a presser foot having a portion overlying the work provided with a needle opening and a slot. projecting at an angle tothe travel of the Work and in communication with the needle slot in advance of'the center thereof, a reciprocating member axially alinedwith the axis of said slot, a'downwardly curved hook-shaped nose piece for the end of the member projecting into said slot and disposed to crowd the free edge of the tuck being formed at spaced intervals as the tuck advances under the presser foot, said nose being disposed to advance to the opposite side of the needle opening and in a path in advance of the center thereof, a

guide attachable to the sewing machine and provided with guide blocks to carry the reciprocating member, means for resiliently holding the member in retracted position, and means receiving its power from the sewing machine mechanism to project the member throu h said slot.

2 tucking device for a sewing Inachine, the combination of a presser foot having the portion engaging the work provided with a needle opening and a slot between the latter and the side of the foot, a reciprocating bar terminating 'in a downwardly curved hook-shaped nose projecting into said slot, a

guide means for said bar, and a crank. operating from the sewing machine: and engaging said bar to cause the nose to traverse the slot beyond the center of the needle opening to crowd the free edgeof the tucking at spaced intervals during'itstravel under the said foot. 1

In testimony whereof we affix our signa tures. c

GEORGE 'WORN AL' JOHNSON. HENRY CLAY TRUSLOVV.

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