US 6,327,877 B1Granted

Device and method for obtaining festoons on a crochet machine for wrap weaving

OwnerLuigi Omodeo Zoriniinventor

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Abstract

A device for obtaining festoons mounted on crochet machines for warp weaving comprises a curling hook engaged on a respective hook-holder block, a first motor, a second motor and a programmable electronic regulating unit. The first motor is operatively engaged to the curling hook and the second motor is operatively engaged to the hook holder block. The electronic unit activates the second motor to translate the hook and activates the first motor to curl the woof thread engaged on the hook itself by rotating the latter. The electronic unit, the positioning of the hook in the ending position and the rotation of the hook according to the distance assumed with respect to the needles of the machine. The electronic unit controls in synchronism to the motors, also, a cop-holder bar to produce a festoon having twisted threads of variable length.

Claims14

Dependent claims

Device for obtaining festoons on a crochet machine for warp weaving, said machine comprising one or more needles, at least one thread-guiding cop movable between a first position wherein the thread-guiding cop is located in proximity to the needles to engage operatively therewith at least one woof thread borne by the cop itself, and a second position wherein the cop is laterally displaced with respect to the needles to extend the woof thread away therefrom, said device comprising:

at least one curling hook presenting a hooking portion set to engage the woof thread borne by the thread-guiding cop;
first control means to actuate the rotation of the curling hook around an axis of rotation essentially perpendicular to the hooking portion itself;
wherein the improvement comprises:
at least one hook-holder block engaging the curling hook;
second control means operating on the hook-holder block to take the curling hook from a starting position, wherein the curling hook is located in correspondence with the thread-guiding cop, and an ending position, wherein the curling hook is located between the starting position and the needles;
selection means operatively associated to the second control means to select the distance of the starting position and of the ending position from the needles at each working cycle of the textile machine.

3 more elements

Method to obtain festoons on a crochet machine for warp weaving, comprising the phases of:

moving at least one thread-guiding cop from a first position wherein the thread-guiding cop is located in proximity to one or more needles to engage operatively therewith at least one woof thread borne by the cop itself, to a second position wherein the cop is laterally displaced with respect to the needles to extend the woof thread;
winding the woof thread around a hooking portion of a curling hook located in correspondence with the second position of the thread-guiding cop by causing the cop to pass around the hooking portion and bringing said cop back to the first position;
rotating the curling hook around an axis of rotation perpendicular to said hooking portion to curl the wound woof thread and form a twisted thread of pre-determined length;
translating the rotating curling hook from a starting position, wherein the curling hook is located in correspondence with the thread-guiding cop in the second position, to an ending position, wherein the curling hook is located between the starting position and the needles;
disengaging the twisted thread from the curling hook;
wherein the improvement comprises the phase of selecting the distance of said starting position and of said ending position with respect to the needles at each working cycle to determine the formation of twisted threads of differentiated lengths.

3 more elements

Dependencies are inferred from the claim text.