Porter Sewing Machines, Inc.

Charles E Mulcahey

Michael R Porter

John J Kirby

Steven Marcangelo

Method and apparatus for manipulating and sewing flexible fabrics

An improved method and apparatus for the assembly of pillow-top mattress covers. In the method of this invention, the gussets for a pillow-top mattress cover are prepared in a single step in which the gusset material is folded longitudinally, and the flange material is attached thereto and the gusset material is sewn together in one stitch. Thereafter, a gusset is attached to each of the top and bottom panels of the cover along its outer edge. Each gusset is secured to the underside of its associated top or bottom panel at the folded edge using a blind stitch which is not visible externally of the panel. No gluing is required. During the step of attaching the gusset to its associated mattress cover panel, precisely positioned mitered corners are formed on the gusset where the gusset is to be attached to the corner of its associated panel. In the apparatus of this invention, a conventional blind stitch machine is modified to accept thicker work by providing a wider cam for urging work into the needle area, top and bottom feed rollers disposed even with the needle, and pneumatic control of the lower support arm.

Apparatus for assembly of pillow-top mattress covers

A method and apparatus for forming a partial mattress sack which prevents radial bunching of the mattresses. The method includes the steps of feeding first and second panels having different edge lengths at different rates through a sewing machine to form the partial mattress sack. The apparatus includes a variable speed upper walking foot having an automatic speed adjustment.

Variable walking foot apparatus for a sewing machine for mattresses

A method and apparatus for forming a side panel for a mattress sack or a box spring enclosure. The apparatus includes a double needle sewing machine and a guide for the ends of the folded side panel which are being stitched together which aligns and guides the ends through the stitching area. Photocells are provided to start and stop the stitching process. The method includes the step of stopping the stitching process after a predetermined number of stitches if light from a second photocell in the feed direction is not interrupted within a predetermined number of stitches.

Method and apparatus for forming the side panel of a mattress sack

Method and apparatus for assembly of pillow-top mattress covers

A method and apparatus for maniuplating and sewing first and second panels together is disclosed including a rotatable arm for rotating a first panel and control means for reducing the stitching speed in response to detection of a comer of the first panel.

A method for forming a partial mattress sack which prevents radial bunching includes feeding first and second panels having different edge lengths at different rates through a sewing machine to form the partial mattress sack. An apparatus for sewing the partial mattress sack includes a mechanism for driving upper and lower walking feet at varying rates and a mechanism for driving the upper walking foot at the same speed as a second lower walking foot.

Method and apparatus for closing mattresses

The invention comprises improvements to sewing machines for increasing the throat clearance of the machine. The improvements relate to 1) modifications to mechanical components of the machine to increase the throw and upper travel limits of the presser foot, upper feeding foot, needle and spreader, 2) an adjustment for allowing the speed of the upper walking foot to be variable relative to the speed of the lower walking foot, and 3) an improved biasing spring for biasing the presser foot downward.

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Beverly, MA, United States of America

Charles E Mulcahey