Apparatus for threading of folding sheets

Claim 1

A method for thread stitching and sealing folded sheets with threads using rotating, controlled stitching needles comprising the steps of feeding folded sheets along a rotating circular surface carrying a thread wound off a spool and being clamped on the surface, cutting the thread to hold thread pieces from a direction inside of the circular surface, stitching from a direction inside of the circular surface with radially moving retractable stitching needles, driving the ends of the thread pieces through folded sheets being fed upon the circular surface and forming a clamp of thread, retracting the stitching needles and then inclining the ends of the thread by a stationary sealing means, sealing the inclined ends on the surface of the folded sheet, and feeding out the folded sheet from said circular surface.

Claim 2

A method for thread stitching and sealing folded sheets with threads using rotating, controlled stitching needles comprising the steps of feeding folded sheets along a rotating circular surface carrying a thread wound off a spool and being clamped on the surface, cutting the thread to hold thread pieces from a direction inside of the circular surface, stitching from a direction inside of the circular surface with radially moving retractable stitching needles, driving the ends of the thread pieces through folded sheets being fed upon the circular surface and forming a clamp of thread, retracting the stitching needles and then inclining the ends of the thread by a stationary sealing means, sealing the inclined ends on the surface of the folded sheet, and feeding out the folded sheet from said circular surface.

Claim 3

A device for thread stitching and sealing folded sheets with threads using rotating, controlled stitching needles comprising a rotating cylinder, gripper means operatively mounted on said rotating cylinder for feeding a folded sheet around a part of said cylinder, said cylinder having a surface formed with a groove for a thread pulled off a spool, means disposed within said cylinder for holding the thread within said groove, means for cutting said thread into thread-pieces into a length of a thread sealing clamp, said holding means for holding said thread-pieces, radially moveable stitching needles mounted within said cylinder, and a stationary cam in the center of said rotating cylinder for moving said stitching needles.

Claim 4

A device for thread stitching and sealing folded sheets with threads using rotating, controlled stitching needles comprising a rotating cylinder, gripper means operatively mounted on said rotating cylinder for feeding a folded sheet around a part of said cylinder, said cylinder having a surface formed with a groove for a thread pulled off a spool, means disposed within said cylinder for holding the thread within said groove, means for cutting said thread into thread-pieces into a length of a thread sealing clamp, said holding means for holding said thread-pieces, radially moveable stitching needles mounted within said cylinder, and a stationary cam in the center of said rotating cylinder for moving said stitching needles.

Claim 5

An apparatus for stitching of folded sheets with threads, comprising a rotating cylinder adapted to be applied to any folding device, said rotating cylinder including, sheet-holding means, radially movable stitching needles at its periphery, radially movable pressing members, said pressing members terminating at any given point of the periphery of said cylinder over larger part of the circular path of said cylinder with the cylindrical face, said stitching needles having their tip projecting from their cylindrical surface, said folded sheets guided on said cylinder over a further part of the path to a heatable sealing rail, a stationary needle guide body having two endless cam grooves, a rotating needle carrier coordinated to said needle guide body and provided on its periphery with swingable stitching needles, and the distance of the latter from said folded sheet is determined by one of said cam grooves and the vertical position of said stitching needles to said folded sheet within the piercing range is determined by levers fastened to said stitching needles and coordinated to the other of said cam grooves.

Claim 6

An apparatus for stitching of folded sheets with threads, comprising a rotating cylinder adapted to be applied to any folding device, said rotating cylinder including, sheet-holding means, radially movable stitching needles at its periphery, radially movable pressing members, said pressing members terminating at any given point of the periphery of said cylinder over larger part of the circular path of said cylinder with the cylindrical face, said stitching needles having their tip projecting from their cylindrical surface, said folded sheets guided on said cylinder over a further part of the path to a heatable sealing rail, a stationary needle guide body having two endless cam grooves, a rotating needle carrier coordinated to said needle guide body and provided on its periphery with swingable stitching needles, and the distance of the latter from said folded sheet is determined by one of said cam grooves and the vertical position of said stitching needles to said folded sheet within the piercing range is determined by levers fastened to said stitching needles and coordinated to the other of said cam grooves.