CS252777B1 - A device for crossing oppositely directed threads on a knotter - Google Patents

Abstract

The device for crossing counter-directional threads is intended for a knotter who connects counter-directional threads with a fishing knot. This device consists of a pair of crossing arms, which are connected by a lever transmission with a pulley to another rocker. The movement of the pulley is controlled by a shaped groove on the other rocker. The shaped groove is provided with an extension in its central part and a blocking lever is adjustable against this extension on the other rocker, the active part of which overlaps the extension of the shaped groove in at least one of its positions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for crossing oppositely directed yarns on a knot, which serves to connect these yarns with a fishing knot. The thread crossing is performed by a pair of pivot arms mounted on a knot frame. Together with the crossing arms, the knotter is equipped with a pair of knots, a knot tightening device and a device for braking the threads to be joined®

One of the known devices for crossing oppositely directed yarns on a knotter is disclosed in U.S. Pat. No. 138,603, wherein the pivotally mounted crossing arms are connected by a lever transmission to a roller that engages the curved groove of the pivotally mounted rocker arm. The curved groove has in the middle part a curvature oriented in the opposite direction to the curvature of its front and rear parts. The curvature of the middle part of the groove causes a partial return movement of the roller during the rocker arm swing, which by means of said lever transmission realizes a partial return movement of the crossing arms. This leads to loosening of the threads on the crossing arms when the loops are pulled from the knots, which is advantageous for binding thick threads, but this device is unsuitable for binding fine threads. In these cases, too long loose thread ends are formed on the knots formed. Thus, the main disadvantage of said device is its low versatility with regard to the usable range of the bonded yarns.

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This disadvantage can be overcome by using larger or finer knots. However, their replacement on the knotter is relatively complex and it is preferable to make separate knotters for finer or coarser threads.

Disadvantages of the known devices are eliminated by a device for crossing counter-directionally threaded yarns on a knot according to the invention, which consists of a pair of crossing arms. On the one hand, these arms are pivotably mounted on the knot frame and, on the other hand, connected by means of a lever transmission to a roller which engages with the shape groove of the rocker arm. SUMMARY OF THE INVENTION The central groove of the invention is provided with an extension in its central part, against which a locking lever is pivotably mounted on the rocker, which is adjustable to the rocker. In this case, the locking groove is covered by the locking lever in at least one of its positions.

An advantage of the device according to the invention lies in the possibility of regulating the amount of partial backward movement of the crossing arms by adjusting the locking lever relative to the shape of the rocker arm. This makes it possible to use one embodiment of the knotter with the device for crossing the oppositely directed threads according to the invention for binding both fine and coarse threads.

for example, a device for crossing counter-directionally threaded yarns on a knotter according to the invention is shown in the accompanying drawings, where FIG. 1 is a partial cross-sectional view of the overall configuration of the apparatus, and FIG. 2 is a cross-sectional view of the I-I apparatus of FIG. 1. FIGS. 3 and 4 are views of the rocker and locking lever of the invention.

The device for crossing oppositely directed yarns on the knots according to the invention shown in Fig. 1 consists of a pair of crossing arms 2 which are pivotally mounted by pins J on the outside of the knotter frame 1. The crossing arms 2 are pushed through and their active parts pass through slots 4 in the knotter frame 1 to the knotter workspace ·

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In the central part are provided with grooves which extend into the arm 6 to the outer portion of the rocker arm 7, which is rotatably mounted on the intermediate wall 8 vazačového frame 1. The inner part of the rocker arm 7 is provided with a further notch 2 ⁸ which is engaged by a second pin 10 the rod 11, which is slidably mounted on the partition 8 and is guided through the inner part of the rocker arm 2 (FIG. 2). The rod 11 is bent at right angles and its side, which is perpendicular to the intermediate wall 8, is provided with a further groove 12 into which the third pin 13 of the lever 14 engages, pivotally mounted by the fourth pin 15 on the inner wall of the knotter frame. a lever 16 extending into the shape groove 17 of another rocker 18 which is mounted on a shaft 19 rotatably mounted in the knot frame 1. The rocker 7, the rod 11 and the lever 14 form a lever transmission 20 (dotted in FIGS. 1 and 2) between by another rocker arm 18 and crossing arms 2.

The shape groove 17 of Figs. 3 and 4 is provided in its central part with an extension 21 in the section through which the pulley 16 passes during the pulling of the thread loops from the knots 22. Against the extension 21 of the shape groove 17 The locking lever 24 has at least two openings 26 so that it can be fastened with a screw 27 to another rocker 18 in the extreme operating positions. .

The device according to the invention is actuated by a rod (not shown) mounted on the shaft 19 of another rocker 18, which begins to oscillate. The shaped groove 17 presses on the roller 16 and this pressure is transmitted for a longer time by the lever transmission 20 to the crossing arms 2. The entire mechanism is moved to the second end position.

If the locking lever 24 is fixed in a position that does not cover the extension 21 of the groove 17, during the withdrawal of the thread loops from the knots 22, the crossing arms 2 may partially return and thereby loosen the yarns and result in longer threads.

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- 4 node ends (ebr. 3). Conversely, if the locking lever 24 is fixed in the position overlapping the extension 21, the crossing arms 2 are returned and thus the thread cannot be released and the ends of the knots remain short (FIG. 4).

A finer regulation of the length of the knot ends can be realized by creating additional openings 26 between the shown extreme positions of the locking lever 24 (in Figs. 3 and 4) or by replacing these openings with a continuous not shown groove.

Another advantage of the device according to the invention is that it can be adjusted to the desired yarn assortment without removing the knotter. It is sufficient to access the screw 27 for fixing the position of the locking lever 24.

Claims (1)

OBJECT OF THE INVENTION A device for crossing counter-directionally directed yarns on a knotter for joining these yarns with a fishing knot, which consists of a pair of crossing arms both pivotably mounted on the knotter frame and connected by means of a lever gear with a roll engaged with the groove of another rocker, The shape groove (17) is provided in its central part with an extension (21), against which a locking lever (24) is pivotably mounted on a further rocker arm (18), which is fixedly adjustable to the other rocker arm (18). 1), in at least one position thereof, the extension (21) of the groove (17) is covered.