CS247634B1 - Thread warp separation apparatus - Google Patents

Abstract

A device for separating warp threads and equalizing tension in individual warp branches, developed especially for warps with a rough surface structure and lower strength. The device consists of a frame consisting of two bars, the ends of which are connected on both sides by side rails. The solution is that the side rails have one or more holes for adjustable mounting of the frame on pins, rotatably mounted in bearings mounted on the sides of the weaving machine. The rear bar of the frame usually has a larger diameter than the front bar. For wide weaving machines, the frame can be reinforced with reinforcing bars inserted between the side rails.

Description

BACKGROUND OF THE INVENTION The invention relates to a device for separating threads and equalizing stresses in individual strands of a warp, in particular for warps characterized by a rough surface structure and lower strength.

Until now, weights have been used to separate the threads in the individual shed branches to create warp crossings and to provide order between the warp threads. Dumbbells usually tied at the ends.

In this arrangement, however, the dumbbells were not sufficient to distribute the switches in the warps with a rough surface structure. In order to prevent high warp yarn breakage, the weaver had to contribute relatively often manually to separate the warp threads sufficiently and without breaking.

Especially in the processing of the flax warps, the weaver must bypass the weaving machine during these interventions, thereby shortening the time period for further control of the weaving process.

Also known is a pivot bar system for preventing the warp threads from being joined together according to DE 3242802. The system comprises a frame formed by two dumbbells connected on both sides by side bars.

The side rails are provided with a fixed elongated pin which freely passes through the opening of the support console in which it is rotatably mounted. By means of a single-arm lever and other devices, the frame is controlled and separates the yarns in a vertical direction by pivoting movement.

The disadvantage of this system is the forced movement of the branches, which relatively aggressively spread the threads, but does not equal the tension of the individual branches of the warp, important for the gentle separation of the less firm, especially flax warp threads.

Forced movement during swings does not respect the mutual tension between the two branches and more fulfills the function of the washboard used to increase the meetability of heavy fabrics.

Also known is a mechanical device for increasing the weft density according to DE 3044175. It is a system consisting of three rods, wherein a warp divided by a rear rod into two branches passes between two successive rods placed one above the other.

The three rods are fixed to each other by side plates. The connecting plate is rotatably mounted on one or both edges. Vertical fluctuations alternate tension shed branches. The device is disadvantageous in that the pivoting movement is forced driven; so it does not self-level the shed branches. It serves only as a washboard to increase the weight of heavier fabrics.

Also known is a device according to USP 4235260, which has a 'different' design and purpose. The main functional organ here is a molding that acts only as a washboard. It also has a forced movement, so that it does not compensate for fluctuations in the tension of the branches and can not act in splitting the threads which are held by the well-known cross-thread in the yarn cross.

It was an object of the present invention to provide a warp thread separation device, particularly suitable for warps drawn from less rigid warp threads having a rough, surface structure prone to forming staples and strands that negatively affect the weaving process of excessive breaking.

Mainly, the reduction of the warp yarn breakage is observed by eliminating the mere spreading of the glued yarns by forced movement dumbbells, since the forced pendulum movement has a very aggressive effect on the warp yarns and increases the warp yarn breakage.

The new device separates the threads of the warp while automatically compensating the thread tension in the individual shed branches, which has a considerably more gentle effect on the pulled threads and reduces their breakage.

The warp thread separation device comprises a frame consisting of two rods, the ends of which are fixedly connected on both sides by side strips. SUMMARY OF THE INVENTION The side strips are provided with at least one opening for adjustably mounting the frame on the pins, which are rotatably mounted in bearings mounted on the sides of the weaving machine.

The rear bar of the frame usually has a larger diameter than the front bar. To reinforce the frame for wider weaving machines, additional reinforcing bars can be inserted between the side bars.

The effect of this device is to separate the warp threads while automatically equalizing the stresses of the individual warp branches. The self-balancing tension of the warp branches is achieved by extending the warp branches across the frame bars as a function of displacement of the transverse axis of the frame, wherein the force exerted by the bars on the individual warp branches is automatically exerted by varying the tension of the individual branches.

The advantages of this method of separating the warp threads are, in particular, that they eliminate the aggressive spreading of the glued threads by force-driven dumbbells and replace by the gentle effect of the frame-mounted and non-force-operated dumbbells.

This results in a considerable reduction in the warp yarn breakage, especially in the less rigid warp with a rough surface structure, i.e. the flax warp. Equalizing the stresses of the warp strands is positively reflected in a reduction in the warp yarn breakage, thereby increasing labor productivity and improving the quality of the fabric produced.

An exemplary embodiment of the device according to the invention is schematically shown in the drawing showing the location of the frame in the weaving plane.

The frame consists of a rear bar 2 »front bars 2, which are connected at the ends by side rails 2 · ^{in the} side rails 2 there are holes 4, 4 for adjusting the frame on the pins 2 ·

The pins 2 are rotatably mounted on both sides of the weaving machine in bearings' 2 'located on the sides 10. The frame is located between the warp clamp T and the row of slats 2'.

The frame is preferably inserted immediately after the warp clamp T, where the warp 2 passes into a weaving plane. The procedure is such that after opening the shed, in which a group of leaves to form a common branch of the warp is lifted, the rear bar 2 of the frame is inserted into the shed.

When the other shed is opened, the front bar 2 is retracted. The ends of the rods 1 are fastened by side bars 2 ^and a rigid frame is formed which can be further reinforced for wide weaving machines by one or two reinforcing bars placed approximately in the middle of the frame.

There are at least three openings 4, 4 ', 4' in the side rails 2, which serve to adjust the frame on the pins 2, the pins 5 are rotatably mounted in bearings 2 »mounted on the sides 10 of the weaving machine.

The pins 5 ^are oppositely inserted into one of the holes 4, 4 ', 4 in the side bars 2. By inserting the pins 2 into the other than the central hole 4, the axis of the frame is moved, allowing self-regulation of the force curriculum.

The automatic regulation is that the more tense branch swings the frame against the more free branch so that equilibrium occurs. This also extends the warp stroke to all warp threads, not to half of them.

If a warp with a large number of switches is processed, pins 2 are inserted into the furthest

Openings' 4 the warp whip roll 2 · ^This warp extend toward the rear lever arm rod 2 ·

By a stronger swing of the rear bar 2 ^{, the} switches coming from the warp clip 6 are opened more effectively.

The central aperture 4 is selected for conventional types of warps for which it appears to be optimal and most used.

The aperture 2 ^is selected for a smooth, warp-free warp, whereby the extended arm carrying the front bar 2 automatically adjusts the tension of the two warp branches to self-regulation.

Claims (3)

An apparatus for separating the warp threads, consisting of a frame consisting of two rods, the ends of which are fixedly connected on both sides by side bars, characterized in that the side bars (3) connecting the front bar (2) and the rear bar (1) are provided with at least one bore (4, 4 ', 4) for adjustably mounting the frame on the pins (5) rotatably mounted in bearings (9) attached to the postbars (10). Device according to claim 1, characterized in that the rear bar (1) has a larger diameter than the rear bar (2). Device according to claim 1, characterized in that the frame comprises at least one reinforcement strip interposed between the side strips (3).