FR2539768A1 - SYSTEM FOR PROTECTION, AGAINST DUST AND DUST, OF THE SPRING OF FINGER-HAND NEEDLE HEADS IN A WEAVING - Google Patents

Abstract

THE INVENTION RELATES TO THE WEAVING INDUSTRY. THE SPRING 7 OF THE CLAMP 1, 2, 3 OF THE WEFT PASSENGER NEEDLE OF A Loom is COVERED BY A SLEEVE 9 OF SOFT MATERIAL WHICH PREVENTS THE DEPOSIT OF DUST ON AND IN THE SPRING. THE INVENTION ALLOWS ANOMALIES OF THE OPERATION OF THE WEFT-PASSING CLAMPS TO BE AVOIDED BY THE ACCUMULATION OF DUST IN THE RETURN SPRING OF THE CLAMPS.

Description

Protection system, against the down and the wife

  the spring of the needle heads pass-

weft in a loom.

  The invention relates to the protection against down and dust, a spring mounted in a needle head for the insertion of a wire of

weft in a loom.

  In shuttle-free weaving,

  Needles allow the insertion of a weft thread.

  The head of the needle can be considered as a clamp composed of a body and a movable pin pinching against each other by their free end under the action of a spring, this spring is adjustable

  to allow the pinching and transfer of

  me with a minimum of effort to exercise on the wire.

  This is why a coil spring is often used, the precompression of which can be adjusted

by means of a screw.

  The body itself can have different

  in most cases it is wide open at least on one side, while the other sides are usually pierced with holes in order to lighten the needle head as much as possible. A boss belonging to the body is provided for the attaching a twig making a clip with a body part to hold the

  frame during insertion into the crowd.

  There are needles with negative forceps and positive forceps, both executions are subject to

to the action of a spring.

  For the pinch needle called negative, the wire is inserted between the body of the needle and

  his forceps by his own tension, while for the sake of

  called positive guille, the clamp is opened by a command, the wire is introduced and the clamp closes

  on the wire Frequent maintenance of the spring is necessary

  necessary for its correct operation.

  The weaving machines by their crossing

  tinuel son, deposit on all parts of

  the machine an important layer of down.

  The outside of the head of the needle is at each exit of the crowd rubbed by the warp threads that cross, the down can not be fixed, but it is different for the interior

  of the needle head Gradually all cavities

  tees and the spring are filled with down, the movement of the twig that is ordered prints the spring a regular back and forth which compact more and more

  the down, reducing the stroke of the forceps and, in

  sequence, its opening At this moment, a cleaning of

  the needle head is necessary.

  The present invention aims to remedy

  these disadvantages by isolating the spring of the down.

  We know a Swiss patent No. 472 524 which

  describes a protection by a synthetic soft material

  tick to avoid filling the cavities with the down, and remove the cleaning, but the protection

  a helicoidal spring is not considered.

  The subject of the invention is a system of

  protection against down and dust from the helical spring of the weft needle heads in a loom, characterized in that at least one of the outer or inner surfaces of the turns of the thread is covered by a flexible elastomeric material element with sufficient flexibility

  not to significantly change the characteristics of

elastic elements of said spring.

  The preferred embodiment of the invention

  to enclose the spring in a flexible plastic tube and thus isolate it entirely from

the external environment.

  The invention solves the problem of cleaning the region of the location of the spring and the volume

occupied by this one.

  The invention also aims at the heads of

  the frame passes whose spring is equipped with such

protection system.

  The invention will be better understood by means of

  the description and drawings representing two modes

  Figure 1 shows a partial section

  of a needle head showing the location of the

spell and his protective sleeve.

  Figure 2 shows a protection with a

  soft inside the spring.

  FIG. 1 represents a conventional needle head 1 composed of a body 2 and a sprig

  mobile 3 mounted free to rotate by a pin 4.

  The branch 3 has a heel 5 allowing it, by

  via a fixed or movable control device

  the unrepresented, to pivot around the pin 4 and to open the inlet 6 for positioning and

  narrowing of the weft thread after erasing the orga-

do not order.

  A helical spring 7, adjustable by a screw 8, keeps the pin 3 always against the body 2. The down and dust tend to accumulate all around the spring 7, inside of it and between its turns Gradually, the dust tends to impede the free play of the spring, this

  which produces a malfunction of the clamp.

  According to the embodiment of the invention

  1, a sleeve 9, of flexible elastomeric material is fitted on the outer surface of the turns of the spring 7 This sleeve 9 is supported on the one hand on the inner face of the body 2 and on the other hand , on the face facing the movable pin 3 This sleeve therefore protects against dust, all the volume encompassed by the spring and, thanks to its flexibility, it allows proper operation of the spring, in a sustainable manner, without requiring

of cleaning.

  According to the embodiment of the invention

  shown in FIG. 2, a flexible plug

  is fitted inside the spring 7 to prevent

expensive down to accumulate.

  Of course one can provide both the outer sleeve (provided in Figure 1) and the inner cap (Figure 2), but in this case, it is even more advantageous to insert by molding

  the complete volume encompassed by the jurisdiction in a

  a flexible element allowing, without appreciable additional resistance, a correct functioning of the spring with a total protection against dust and

the down.

Claims (1)

1 system for protecting, against down and dust, the helical spring of the weft guide heads, in a loom, characterized in that at least one of the outer surfaces or The inner turns of the spring coils (7) are covered by a flexible elastomeric material element (9, 10) having sufficient flexibility not to substantially modify the elastic characteristics of said spring. 2 System according to claim 1, characterized in that the aforesaid element is constituted by a plug (10) of flexible material introduced into the interior of the spring (7). 3. System according to one of claims 1 or 2, characterized in that the aforementioned element is- constituted by a sleeve (9) of flexible material fitted over the spring. 4. System according to claim 1, characterized in that the aforesaid element is constituted by a coating, carried out by molding, which covers the entire volume encompassed by the spring (7) by means of a flexible material. Thread needle head for a loom, characterized in that it comprises a protection system according to one of the claims 1 to 4.