Pin for use in fabric stacking and pinning table

Apparatus for supporting sheet material such as cloth during operations such as cutting performed thereon comprising:

• a) a supporting frame;
• b) means on said frame defining a planar supporting surface adapted to receive plies of sheet material placed thereon, said surface having a plurality of through apertures therein of substantially circular shape and arranged in a pattern on said surface, said surface having an outer portion contacting said material and an oppositely disposed portion;
• c) a plurality of pins each disposed substantially perpendicular to the plane of said surface and each located in registry with one of said apertures, each of said pins having a sharp head at one end and an enlargement at an opposite end, each of said pins having a body which is elongated and of substantially circular cross-section;
• d) a plurality of separate pin holding and supporting means carried by said frame and arranged in rows therealong and facing said oppositely disposed portion of said supporting surface, each of said pin holding and supporting means being of relatively narrow width and having a length extending transversely of said supporting surface and said plurality of holding and supporting means being in closely spaced relation extending longitudinally of said supporting surface, said holding and supporting means receiving said pins at said opposite ends thereof and maintaining the disposition of said pins substantially perpendicular to the plane of said surface and the location of said pins in registry with said apertures, each of said pin holding and supporting means including a pair of sidewalls in spaced relation extending along said length and having oppositely facing inner surfaces and defining a trough-like region open toward said portion of said supporting surface;
• e) each of said pin holding and supporting means including pin contacting means movable about an axis substantially parallel to said length between a first position wherein pins are releasably held in said pin holding and supporting means to a second position wherein said pins are firmly clamped in said pin holding and supporting means betwen said inner facing surfaces of said sidewalls and corresponding opposite surfaces of said pin contacting means, said surfaces of said pin contacting means engaging said enlargements in a manner holding said pins against movement in a direction perpendicular to said supporting surface;
• and
• f) means carried by said frame for moving said holding and supporting means to move said pins through said apertures inwardly between a position where the heads of said pins are spaced inwardly from said outer surface portion and a position where said pins extend through said apertures and the heads of said pins are spaced outwardly from said outer surface portion so that said sheet material can be anchored on said pins;
• g) said enlargement being of a shape and size allowing unimpeded movement of said pins and said enlargements through said apertures, said enlargement being of substantially circular cross-section having a diameter larger than the diameter of said body.

A pin in combination with an apparatus for supporting sheet material such as cloth during operations such as cutting performed thereon comprising a supporting frame, means on said frame defining a planar supporting surface adapted to receive plies of sheet material placed thereon, said surface having at least one through aperture therein, of substantially circular shape said surface having an outer portion contacting said material and an oppositely disposed portion, pin holding and supporting means carried by said frame and facing said oppositely disposed portion of said supporting surface, said holding and supporting means adapted to receive a pin and maintain the disposition of the pin substantially perpendicular to the plane of said surface and the location of the pin in registry with said aperture, and means carried by said frame for moving said holding and supporting means to move the pin through said aperture so that sheet material can be anchored on the pin, said pin comprising:

• a) an elongated body of substantially circular cross-section having a substantially constant diameter along substantially the entire length of said body and terminating in a sharp, pointed head at one end of said body;
• and
• b) an enlargement at the opposite end of said body having a shape and cross-sectional size enabling said holding and supporting means to positively hold said pin and prevent unwanted withdrawl of said pin while at the same time allowing unimpeded movement of said pin and said enlargement through said aperture, said enlargement being of substantially circular cross-section and having a diameter larger than the diameter of said body along a major portion of the length of said enlargement, said enlargement having a pointed termination on the end thereof which is located on said pin body opposite the pointed head thereof, and said enlargement having an annular surface adjacent the portion of said pin body having substantially constant diameter, said annular surface defining a shoulder adapted for engagement by pin contacting means thereby preventing unwanted withdrawl of said pin from said holding and supporting means.

A pin in combination with an apparatus for supporting sheet material such as cloth during operations such as cutting performed thereon comprising a supporting frame, means on said frame defining a planar supporting surface adapted to receive plies of sheet material placed thereon, said surface having at least one through aperture therein of substantially circular shape, said surface having an outer portion contacting said material and an oppositely disposed portion, pin holding and supporting means carried by said frame and facing said oppositely disposed portion of said supporting surface, said holding and supporting means adapted to receive a pin and maintain the disposition of the pin substantially perpendicular to the plane of said surface and the location of the pin in registry with said aperture, means carried by said frame for moving said holding and supporting means to move the pin through said aperture so that sheet material can be anchored on the pin, and an arrangement for developing a positive pressure to apply a flotation force to sheet material therealong, said arrangement including a sheet of fluid impervious material extending along the inner portion of said supporting surface in a manner preventing fluid flow through said aperture, said pin comprising:

• a) an elongated body of substantially circular cross-section and having a substantially constant cross-sectional dimension along substantially the entire length of said body and terminating in a sharp, pointed head at one end of said body;
• and
• b) an enlargement immediately at the opposite end of said body having a shape and cross-sectional size enabling said holding and supporting means to positively hold said pin and prevent unwanted withdrawl of said pin while at the same time allowing unimpeded movement of said pin and said enlargement through said aperture, said enlargement being of substantially circular cross-section and having a diameter larger than the diameter of said body, said enlargement being provided with an annular substantially conical surface adjacent the portion of said body having substantially constant cross-sectional dimension, said annular surface defining a shoulder adapted for engagement by pin contacting means of said holding and supporting means thereby preventing unwanted withdrawal of said pin from said holding and supporting means, said pin enlargement being provided with a pointed termination on the end thereof which is located on said pin body opposite said pointed head thereof, said pointed termination insuring that said pin does not punch a permanent hole in said sheet of fluid impervious material during set-up of said apparatus.