Tube Forming Patents (Class 112/63)
  • Patent number: 4467734
    Abstract: A sewing machine apparatus including a work support assembly and a positioning assembly that cooperate in moving a workpiece edge through the sewing station of the machine. The workpiece support assembly is arranged to carry and advance the open end of the workpiece in an endless loop configuration. The positioning assembly operatively rotates wih the work support and is effective to influence the lateral placement of the workpiece edge before and during the sewing cycle.
    Type: Grant
    Filed: April 27, 1982
    Date of Patent: August 28, 1984
    Assignee: Union Special GmbH
    Inventor: Gunter H. Rohr
  • Patent number: 4467733
    Abstract: A device for sewing tubular material workpieces comprises a sewing machine mounted in a fixed location adjacent a workpiece holder which, for example is shaped to hold a cylindrical workpiece such as a skirt. The holder is engageable in a rotation drive which rotates the holder at a selected speed. A first setting device is connected to the holder so as to move it upwardly and downwardly in respect to the sewing machine. A second setting device is connected to the first setting device and moves it together with the holder toward and away from the sewing machine as desired. The construction includes a pedal control for regulating the speed of rotation of the workpiece and also the operational speed of the sewing machine.
    Type: Grant
    Filed: January 13, 1984
    Date of Patent: August 28, 1984
    Assignee: Pfaff Industriemaschinen GmbH
    Inventor: Alfred Martin
  • Patent number: 4406233
    Abstract: A sewing unit for withdrawing web material, of the knitted type, from a source, folding it and then seaming one side to place it in tubular form. The apparatus includes a triangle unit for folding the web material as it is received from its source and then advancing it into operative association with a tentering member about which it extends. From the tentering member the folded material is advanced to the sewing zone of a sewing machine and then advanced to a position whereat the tubular material is wound onto a take-up roll. An elongated bar member being selectively adjustable relative to positions inclined from a horizontal plane is adapted to engage and raise the lowermost portion of the folded material whereby it is caused to be displaced toward the machines line of sewing.
    Type: Grant
    Filed: December 20, 1982
    Date of Patent: September 27, 1983
    Assignee: Rockwell International Corporation
    Inventor: Luigi Pisani
  • Patent number: 4401041
    Abstract: Apparatus for making tubular articles formed of a length of material wound in helical form with contiguous edges of successive convolutions of the material joined with one another comprises a forming section made up of a plurality of guide rollers supported by a vertical arch-type frame so as to define a generally cylindrical configuration. Feed rollers propel a strip of material in a lengthwise direction through the arch of the frame and around the support provided by the guide rollers in a helical path with edges of successive convolutions of the helix abutting one another. As the material is thus in effect coiled into helical form, a sewing machine joins contiguous edges of successive convolutions to form a continuous tubular article.
    Type: Grant
    Filed: April 21, 1981
    Date of Patent: August 30, 1983
    Inventor: Harry R. de Polo
  • Patent number: 4370936
    Abstract: A web of fabric material is fed flat along a substantially horizontal table. The web is continuous and is marked and then partly cut just short of its edges while in the feeding plane. The edges of the web are then gripped, moved together, and overlapped as the web is moving, and the edges are sewn. A moving gripper pulls the web through the apparatus to an off the arm sewing machine, and a puller roll downstream of the sewing machine assists pulling of the web and maintains the seam tensioned during sewing.
    Type: Grant
    Filed: October 18, 1979
    Date of Patent: February 1, 1983
    Assignee: Midwestco, Inc.
    Inventors: James D. Moyer, Robert S. Hoffert
  • Patent number: 4198916
    Abstract: Strips of material fed from a supply roll are propelled helically around a cylindrical form with edges of adjacent convolutions of the material contiguous with one another and the contiguous edges of the material are joined together to form a tubular structure. Either before or after formation into a tubular structure the material is cut in predetermined manner into garment lengths and to provide armholes or other openings as desired. In one embodiment means is provided for joining adjacent edges of two or more narrower strips to form a wider composite strip which is then wound helically and edges of adjacent convolutions are joined to form a tubular structure. The narrower strips may be formed from wider material by continuous splitting means which is adjustable to provide different widths. An attachment for a sewing machine has inclined rollers engageable with strips of material being stitched to guide them so that their edges are contiguous as they are being stitched to an underlying tape.
    Type: Grant
    Filed: July 3, 1978
    Date of Patent: April 22, 1980
    Inventor: Harry R. dePolo