Method and device for separating strands

Textiles: manufacturing – Warp preparing or handling – Machine replenishing

Reexamination Certificate

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Details

C028S208000

Reexamination Certificate

active

06230377

ABSTRACT:

The invention relates to a method and an apparatus for singularizing healds, which are lined up at eyes on supporting rails to form a stack.
EP 0 448 957 discloses an apparatus of the aforesaid type in which the healds suspended on supporting rails are laterally deflected in one region from a plane formed by the supporting rails and are elastically deformed in the process. Then, this laterally deflected region, in a direction inclined relative to said plane, is moved along a path away from the stack until this path penetrates into said plane and the lateral deformation of the heald is neutralized again. Since, due to the movement of the region along said path, the heald is also partly deflected from its own plane, which is defined, for example, by the eyes, further regions of the heald follow in a delayed manner. For example, the eyes on the supporting rails move away from the stack later than the laterally deflected region. In the event that parts of the heald stick to the adjacent heald in the stack and therefore do not move away from the stack in the desired manner, a blade-like pivoted lever is provided, and this pivoted lever moves in a plane parallel to that of the heald in the stack and releases such parts from the stack. For each stack, two separating devices are provided at the top and bottom and a pivoted lever is provided in between.
EP 0 646 668 A1 discloses an apparatus of basically the same construction. This apparatus can be used for carrying out a singularizing method in which the frontmost heald of a stack in each case is separated and moved to a transporting unit, for example an endless belt provided with receiving pins for the healds. For singularizing the healds from a stack, firstly the respectively frontmost heald is deflected. Subsequently, the heald is moved in the transporting direction over the entire transporting path to the endless belt by one or more transporting means in the region between the two eyes of the heald pressing against the latter in a directon running obliquely—with respect to a [lacuna] with respect to the supporting rails.
These known apparatuses are unable to give complete satisfaction, since, on the one hand, the stack—as viewed in the direction of the supporting rails—rests on the separating device, so that the healds can be worn out or damaged by the movement of the separating device. On the other hand, the healds, for the transport along the supporting rails, are seized or driven more or less away from the supporting rails, so that the eyes on the supporting rails may tilt and the friction between supporting rail and eye increases.
The object of the invention, then, as characterized in the patent claims, is to provide a method and an apparatus which carefully handle the healds during the separation and subsequent transport away from the stack and stress them as little as possible, especially by friction.
This can be achieved in that the frontmost heald in the stack is laterally deflected in one region of the heald and is then removed from the stack over a first distance. The frontmost heald is then also removed from the stack in further regions in a direction pointing away from the stack, and finally the heald is driven in the region of its eyes and transported further away from the stack along the supporting rails by a second distance. While the heald is laterally deflected, the stack is pushed back.
The apparatus according to the invention may therefore have a separating member designed as a separating blade and intended for separating the frontmost heald from the stack, a stack pusher for pushing back the stack, and a separating finger for separating the heald from the stack over a large part of the length of the heald. Furthermore, it may have a transport member which is arranged in the region of the eyes of the healds. In this case, it is preferred if the transport member is also designed for supporting the supporting rails against the force of gravity.
The advantages achieved by the invention may be seen, in particular, in the fact that all heald types are reliably separated without being damaged or scratched. This is achieved owing to the fact that the heald does not perform any movement relative to the separating blade during the separation. The drive of the separating blade and of the stack pusher can be controlled by detents in such a way that only a single common drive for both elements may be provided, which ensures corresponding cost savings as well as a less—complicated apparatus. Since as little friction as possible occurs between the healds and the separating device, the wear remains low, even when considered over a longer period. In addition, the apparatus according to the invention is also suitable for being designed as at least a twin apparatus for at least two stacks. In this case, various movements may take place in a coordinated manner and consequently common drives may also be provided.
Preferred embodiments of the invention are described in the claims.


REFERENCES:
patent: 3744109 (1973-07-01), Dohi et al.
patent: 4499638 (1985-02-01), John
patent: 4520539 (1985-06-01), John
patent: 5153972 (1992-10-01), Fabrizio
patent: 5184380 (1993-02-01), Benz et al.
patent: 5475906 (1995-12-01), Magdika
patent: 21 24 017 (1971-12-01), None
patent: 0 478 513 (1991-04-01), None
patent: 0 448 957 (1991-10-01), None
patent: 0 646 668 (1995-04-01), None
patent: 2 514 039 (1983-04-01), None
patent: 2 109 426 (1983-06-01), None

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