Textiles: knitting – United needle machines – Straight
Reexamination Certificate
1998-08-07
2001-12-11
Falik, Andy (Department: 3741)
Textiles: knitting
United needle machines
Straight
Reexamination Certificate
active
06327877
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a 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 positioned 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, said hook being able to revolve around an axis of rotation essentially perpendicular to the hooking portion itself; first control means to actuate the rotation of the curling hook.
According to the present invention, a method has also been devised 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 positioned 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 making the cop pass around the hooking portion and bringing said cop back to the first position; rotating the curling hook by means of first control means to curl the wound woof thread and form a first twisted thread of predetermined length; translating the curling hook in rotation from a starting position, wherein the curling hook is positioned in correspondence with the thread-guiding cop in the second position, to an ending position, wherein the curling hook is positioned between the starting position and the needles; disengaging the twisted thread from the curling hook.
DESCRIPTION OF PRIOR ART
As is well known, the crochet machine for warp weaving essentially comprises a foundation presenting two lateral uprights between which extend a fixed front bar or front proper, a movable front bar, a thread-passer holder bar and a cop holder bar positioned parallel to each other.
The front bar presents on the upper part a plurality of grooves parallel to each other and perpendicular to the bar itself to receive in operative engagement respective needles rigidly connected to the movable front bar.
The movable front bar is actuated by respective control means to transmit to the needles a horizontal motion alternated between a back position wherein each needle has a hooked end in correspondence with the front bar and a forward position wherein said hooked end approaches a plurality of thread-passers.
The thread-passers lie side by side and positioned parallel to the needles on the thread-passer holder bar, the latter being able to be actuated by respective control means to move the thread-passers according to a circular trajectory around the direction of longitudinal advance of one or more needles.
The motions of the needles and of the thread-passers are synchronized in such a way that their co-operation on the warp threads gives rise to a plurality of parallel chains that progressively descend from the front bar. In most cases, the chains are also concatenated with warp threads borne by thread-guiding cops present on the cop holder bar.
In the machines intended for the production of festoons, each thread-guiding cop operates above the needles between a first position wherein said cop is positioned in proximity to the needles and a second position wherein the cop is positioned laterally displaced from the needles, in correspondence to a curling hook present on the machine.
When the cop is about to assume the second position, it is rotated slightly around the axis of development of the cop holder bar to wind the respective woof thread around a hooking portion of the curling hook.
Subsequently, the cop translates away from the curling hook to place itself in correspondence with the first position.
When the cop again reaches the first position, the curling hook rotates by a predetermined number of turns around an axis perpendicular to the hooking portion, causing the respective woof thread to curl. In this phase the curling hook translates along its own axis of rotation to facilitate the consequent shortening of the woof thread which is about to be curled.
Once the woof thread is curled, disengagement means act directly on the thread itself to disengage it from the curling hook, extracting it from the hooking position.
The woof thread is curled synchronously with the motion of the thread-passers and of the needles, thereby obtaining a thread that is enmeshed in the chain points and curled on itself in the portion projecting laterally from the chain.
One problem present on such crochet machines is given by the fact that it is possible to produce solely festoons having twisted threads of the same length.
In fact, such machines do not meet current market demands which require also the production of festoons with twisted threads whose lengths are respectively differentiated according to a pre-defined sequence.
Currently, the only possibility for intervention provided by the state of the art consists of setting the machine to produce festoons with twisted threads of a desired length which, however, is always the same for all the twisted threads of the festoon. The operations to be performed for the purposes of the aforementioned setting are, on the other hand, quite long and complicated.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the problems present in the prior art proposing a device able to be applied on a crochet machine for warp weaving which allows, in the production of each festoon, the possibility of modifying the length of the twisted threads of the festoon itself in an extremely simple and immediate way.
This object and others besides, which shall become more readily apparent in the course of the present description, are essentially attained by a device for obtaining festoons on a crochet machine for warp weaving, 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 between 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 of the needles at each working cycle of the weaving machine.
In accordance with the present invention, a method has also been devised for obtaining festoons on a crochet machine for warp weaving, 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 with differentiated lengths.
REFERENCES:
patent: 4034579 (1977-07-01), Tillon
patent: 5680777 (1997-10-01), Zorini
patent: 0 922 803 (1999-06-01), None
Conte Robert F. I.
Falik Andy
Lee Mann Smith McWilliams Sweeney & Ohlson
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