CS210296B1 - Weft picking channel,particularly pneumatic weaving machine - Google Patents

Abstract

The invention solves above all the increase in reliability weft picking while reducing drift meclia consumption and possibility to increase performance of the weaving machine. Weft sling the channel is formed by a system of flat weft guide elements, through-warp shed threads. Guide elements are provided open picking profiles they form one part of the picking channel wall. Other part of the picking channel wall is formed the secondary nozzle body wall that is modified on the batten of the machine under the bottom warp threads of shed. This body wall the secondary nozzles are serrated protrusions on their back surfaces they are at least at the moment of weft picking the bottom warp threads of the shed are stored and in which faces facing the direction of picking wefts are the secondary nozzles. Doing so picking secondary nozzle body the channel is adjusted to be swapped profiles of weft guiding elements channel after closure at the moment of weft picking.

Description

In particular, the invention solves an increase in the reliability of the weft picking while at the same time reducing the consumption of the entrainer and the possibility of increasing the power of the weaving machine. The weft picking channel consists of a system of flat weft guide elements, through the warp threads of the shed. The guide elements are provided with open picking profiles which form one part of the picking channel wall. Another part of the picking channel wall is formed by the wall of the secondary nozzle body, which is provided on the machine bidlen under the lower warp threads of the shed. This secondary nozzle body wall is provided with sawtooth protrusions, on which the lower warp threads of the shed are deposited on the dorsal surfaces at least at the moment of the weft picking, and in the faces transverse to the weft picking direction are the secondary nozzles. In this case, the body of the secondary picking channel nozzles is displaceably adapted to the picking profiles of the picking channel weft guide elements after their opening is closed at the moment of the weft picking.

210298

I I> 1t · I I I I κ η i irt 11 isiiii siujitžiiv υ'ίπυκαωι s óu i a uLuuiit;

The invention relates to a weft picking channel, in particular to a jet loom.

Known pneumatic weaving machines with weft picking by the air jet generated by the main nozzle are generally provided with a picking channel consisting of a set of flat guide elements which are provided with open picking profiles arranged coaxially along the picking length. These picking profiles form part of the wall of the picking channel. Typically, such a weft picking channel is also provided with blowing nozzles with an outlet in the weft picking direction. The entire picking channel is deposited on the loom of the weaving machine.

In a known embodiment of a pneumatic weaving machine, the picking channel is composed of flat cane beams which are provided with an open picking profile forming part of the wall of the picking channel above which the upper warp threads of the open shed pass. Another part of the wall of the picking channel is formed by an inflating body, which is provided on the weave of the weaving machine under the lower warp threads of the shed. Its wall adjacent these lower warp threads of the shed is provided with sawtooth protrusions, on which the lower warp threads of the shed are deposited on the dorsal surfaces at least at the moment of weft picking. The secondary nozzles opening into the weft picking direction are in the side walls of said sawtooth protrusions of the secondary nozzle body. The stroke of the weft inserted into the fabric front is done by the sweep profile of the beam cane.

In another known embodiment of a pneumatic weaving machine, the guide elements of the picking channel are designed as lamellae substantially in the form of a slit ring. In order to direct the air flow carrying the sweeping weft, the surface of the inner circumference of the thus formed picking profile of the guide element tapered in the picking direction. Before the weft picking, the picking channel thus formed is nested through the lower warp threads into the shed and re-emerges after the weft, whereby the picked weft from the picking channel is discharged through openings, i.e. through slots, from guide picking profiles and fabric.

A common disadvantage of these known embodiments is the unfavorable effect of the longitudinal slot formed by the opening of the picking profiles of the guide elements when the weft picking, where the airflow carrying the weft escapes out of the picking channel and entrains the picked weft out of the picking channel with unwanted loops. and similar fabric defects.

The aim of the present invention is to overcome these disadvantages and drawbacks, comprising a shed warp thread through a weft guide system having open pick profiles forming one portion of the pick channel wall and a pick nozzle body provided on the machine's bidlen underneath the shed yarn whose shed the wall adjacent to the lower shed threads forms another part of the picking channel wall and is provided with sawtooth protrusions on which the lower warp threads of the shed are disposed at least at the moment of the weft picking and in whose faces transverse to the weft picking direction weft picking of the secondary nozzle, the essence of which is that the body of the picking nozzles of the picking channel is adjusted to the picking profiles of the picking guide elements of the picking channel to close their opening immediately weft picking.

The weft picking channel according to the invention has many advantages. Above all, it is an increase in the reliability of the correct weft replacement. Furthermore, it is a reduction in the consumption of the entraining medium, i.e. compressed air, with the simultaneous possibility of increasing the speed of the machine and thus the overall performance of the weaving machine, since weft picking is possible within 2/3 of the machine speed. The team. there is also the possibility of designing a perpendicular drive without stamina at an acceptable degree of stress on its mechanism even at high revolutions of the weaving machine.

FIG. 1 is a cross-sectional view of the picking section of the weaving machine with the picking channel in the picking position; FIG. 2 shows another exemplary picking channel in the stroke; and FIG. 3 shows a weft picking channel in longitudinal section.

On a pneumatic weaving machine, not shown, the upper and lower warp threads 1 and 2 forming the shed 3 by a brake mechanism (not shown) are fed from a warp roller (not shown). The warp threads 1, 2 extend between the cane 5 of the spoke 4 to interweave at the binding point 6. From there, they are guided as a fabric 7 via a support 8 over the spacers 9 mounted on the beam 10, onto a drawing and commodity wall (not shown).

The spoke 4 is mounted on the bidlen 11, which on the machine is pivoted from the picking position (FIG. 1j to the punching position (FIG. 2J). In the exemplary embodiment, the picking channel weft guide elements 12 are formed directly from the flat cane 5 of the spoke 4. 2 or according to FIG. 1 in the form of a triangle, one side of which is formed by an inflating body 14. The opening 15 of the picking profiles 13 is directed to the binding point 6. The picking profiles 13 of the weft guide elements 12 The other part of the picking channel wall is formed by the body 14 of the secondary nozzles 23 provided on the baffle 11 beneath the lower warp threads 2. Its wall adjacent to these lower warp threads 2 is provided with sawtooth projections 16 , on whose back surfaces 17 at least at the moment of swapping they are placed lower and in whose faces 18 transverse to the weft picking direction 22, the secondary nozzles 23 are connected, connected to a compressed air distribution system (not shown), as well as the main nozzle shown, not directed to the axis of the picking channel described. The secondary nozzle body 14 is displaceably mounted on the machine bidlen 11 to the picking profiles 13 of the weft guide elements 12 until their opening 15 is closed. In FIG. 1, the secondary nozzle body 14 is shown in the swap position where at least a portion of the dorsal surfaces 17 closes the opening 15 of the picking profiles 13 of the weft guide elements 12. In FIG. 2, the body of the secondary nozzles 23 is shown in the stroke position when the dorsal surfaces 17 are moved outside the opening 15 of the picking profiles 13 so that the picked weft 22 can be knocked into the binding point. 6. This adjustable bearing of the secondary nozzle body 14 is, for example, designed such that the body 14 is provided with guide pins 24 displaceably mounted in the guide 25, these guide pins being connected by connecting rods 26 to eccentrics 27 rotating in the weaving rhythm. According to FIG.

2 and 2, the guide pins 24 of the secondary nozzle body 14 are provided, for example, with cavities 28 which, in the swiveling position of the body 14, connect the secondary nozzles 23 to the pressure medium supply 21. It is of course advantageous if, at least over a portion of the pick channel length, the longitudinal edges 19 of the ridges 17 of the sawtooth protrusions 16 of the secondary nozzle body 14 on the side facing the opening 15 of the pick profiles 13 form a line in which the secondary nozzle body 14 touches these openings. 15 and closes the picking profiles 13 of the weft guide elements 12. Therefore, the pitch of each dorsal surface 17 of each sawtooth projection 16 of the secondary nozzle body 14 varies in the weft picking direction 22. In order to improve the function of the secondary nozzles 23 in the faces 18 of the sawtooth protrusions 16, the dorsal surfaces 17 extend over their assigned faces 18. Moreover, the apex edges 20 of the dorsal surfaces 17 of the sawtooth protrusions 16 of the secondary nozzle body 14 may be different.

The described embodiments of the weft picking channel are of course only exemplary and can be varied within the scope of the invention. For example, the weft guide elements 12 may be formed as separate slats or the like.

Claims (7)

SUBJECT OF THE INVENTION A weft picking channel, in particular of a pneumatic weaving machine for inserting a weft through a jetting medium comprising a warp thread of a weft guide system provided with picking profiles constituting one part of a picking channel wall and a secondary nozzle body provided on the machine napkin under the bottom warp threads the wall of which is adjacent to the lower shed threads of the shed forming a further part of the picking channel wall and is provided with sawtooth protrusions, on which the lower warp threads of the shed are placed at the dorsal surfaces at least at the moment of weft picking. to the weft picking direction of the secondary nozzle, characterized in that the picking channel body (14) of the picking channel (23) is displaceably arranged to pick picking profiles (13) of the picking guide elements (12) of the picking channel their opening (15) at the moment of weft picking (22). Weft picking channel according to claim 1, characterized in that the body (14) of the picking channel secondary nozzles (23) is displaceably displaced from the picking position, at least a portion of the dorsal surfaces (17) of its sawtooth projections (16) closing the opening (15) the picking profiles (13) of the weft guide elements (12) of the picking channel, to the stroke position, when the dorsal surfaces (17) of its sawtooth protrusions (16) are outside the opening (15) of the picking profiles (13) of the weft guide elements (12). Weft picking channel according to Claims 1 and 2, characterized in that at least part of the length of the picking channel, the longitudinal edge (19) of the dorsal surfaces (17) of the sawtooth projections (16) of the secondary nozzle body (14); 15) picking profiles (13) of weft guide elements (12) of picking channel form a straight line. 4. The weft picking channel according to claims 1, 2, and 3, characterized in that at least a portion of the dorsal surface (17) of the sawtooth projection (16) of the secondary nozzle body (23) extends beyond the associated face (21) of the sawtooth projection (16). 16). Weft picking channel according to claim 1, 2, 3, 4, characterized in that the apex edges (20) of the dorsal surfaces (17) of the sawtooth protrusions (16) of the secondary nozzle body (14) are with the warp yarn withdrawal direction (1, 2). ) miscellaneous. Weft picking channel according to Claims 1, 2, 3, 4, 5, characterized in that the body (14) of the secondary picking channel nozzles (23) is provided with guide pins (24) displaceably mounted in a guide (25) on the bidlen (11) The guide pins (24) are connected by connecting rods (26) to rotatable eccentrics (27) rotating synchronously with the weaving rhythm. Weft picking channel according to claim 7, characterized in that the guide pins (24) of the body (14) of the secondary nozzles (23) are provided with tubes (28) which connect the secondary nozzles (23) in the picking position of their body (14) with a pressure medium supply (21).