CS208985B1 - Projectil for weft insertion,especially for looms - Google Patents

Description

(54) Weft insertion projectile, in particular for weaving machines

The invention relates to a weft insertion projectile, in particular for spinning weaving machines.

Known projectiles for inserting a weft into a shed of weaving machines with a centrifugal pick are generally formed from a rigid body in which a weft catcher is arranged.

The disadvantage of these projectiles is that during the transition from picking discs to a straight motion, the tunnels and the projectiles are heavily stressed, which negatively affects the life of the whole device and significantly limits the picking speed.

It is an object of the present invention to overcome the above drawbacks and to provide a projectile which makes full use of the advantages of the centrifugal picking device, the principle being that the body of the projectile for weft insertion, in particular for centrifugal weaving looms, is flexible and longitudinally formed. a cavity in which the weft catcher is accommodated.

Further advantages and features of the invention will become apparent from the following description of an exemplary embodiment, schematically illustrated in the accompanying drawings, in which:

1 shows a projectile in a linear motion, FIG.

projectile at the exit of picking wheel .__________

...... ........

The projectile is formed in a body Ϊ in which a longitudinal cavity 2 is formed, in which a retaining device 3 is accommodated. One sliding surface 4 of the projectile is smooth and forms the actual flexible part of the projectile body 1. In parallel with said sliding surface 4, transverse openings 5 are formed in the projectile body 1. The opposite sliding surface 6 of the projectile body 1 is divided by cross sections 7 at the location of the transverse holes 5, preferably in planes passing through their axis of symmetry and perpendicular to the sliding surface.

The drive disk 8 wrapped over the disk 9 by a flat belt 10 is provided on its circumference with a guide groove 11 for guiding the projectile.

By appropriately positioning and shaping the gripping device 3 and the transverse holes 5 in the projectile body 1, a higher projectile is achieved in the front part of the projectile body 1; weight, than in the rear of the projectile body 1, thereby improving, in particular, the transition of the projectile body 1 from the circular track on the drive disk 8 to the straight track.

The projectile body 1 is in the exemplary embodiment metal. However, they may also be made, for example, of flexible plastic or of individual articulated links:

In the case that the projectile body 1 is made of resilient plastic, the body 1 can be made solid without transverse holes 5 and cross sections 7, only with a longitudinal cavity 2 in which the catching device 3 is accommodated.

In the design of the projectile body 1 of the links, the flexibility of the projectile body 1 is achieved by articulating the individual links.

The projectile is guided by the guide groove 10 of the drive disc 7. The projectile 11 is pressed against the bottom of the guide groove 11 by a flat belt 10 and the projectile body 1 is bent in a flexible sliding surface 7 into the radius of the drive disc 8. into the guide tunnel (not shown), the projectile body 1 is gradually j. The projectile body 1 is straight in a linear movement through the shed. and

Claims (4)

SUBJECT A weft insertion projectile, in particular for centrifugal weaving weaving machines, characterized in that the projectile body (1) is flexible and has a longitudinal cavity (2) in which the weft catching device (3) is accommodated. Weft insertion projectile according to claim 1, characterized in that the front part of the projectile body (1) has a higher weight than the rear part. OF THE INVENTION 3. The weft insertion projectile according to claim 1 or 2, characterized in that the projectile body (1) is made of a resilient plastic. ' Weft insertion projectile according to claim 1 or 2, characterized in that the projectile body (1) is composed of links articulated.