CS265099B1 - Device for weaving machine shed producing - Google Patents

Abstract

The invention relates to a device for forming a shed of a weaving machine. In particular, the essence of the solution is that the center of rotation of each of the two-armed levers is located outside the centers of rotation of adjacent two-armed levers. The center of rotation of each of the two-armed levers may be formed either by separate pins whose blades are located on the arm of the hyperbola, and the center of rotation of all the two-armed levers may be formed by a common pin whose inclination to the base plane determines the gear ratio of the individual levers which in the direction increases from the ground plane.

Description

The present invention relates to a device for forming a shed of a weaving machine.

The shed forming device of the weaving machine, i.e. the device for controlling the movement of shed forming shed leaves, consists of a system of levers operated by cams or eccentrics. Each of the levers is provided on one arm with a rod connected to the lord sheet. The amount of stroke of the heald shaft is governed by its position in the shed so as to create an angle of the warp threads defining the space for the weft thread to pass through. Thus, the stroke of each of the shed levers is different in that it increases from the pivot point to the warp war.

Known solutions by which different stroke sizes of the slats and thus the warp threads in the shed can be formed in the lever system are designed such that the two-arm levers are supported on a common shaft perpendicular to their axis. The stroke size is then derived by various embodiments, the best known being those where the two-arm levers are controlled by a constant stroke of the cam or eccentric, the driven arms of which correspond to a given stroke of the heald blade.

The disadvantage of this embodiment is the different positioning of the hinges on the leaf sheets, which places greater demands on the assembly of the beam.

In another case, at different lengths of the drive arms; there is a time shift during the movement of the slats, which has to be compensated in a complicated manner, which in turn brings an increase in the effort of assembling the slat. Another embodiment, which maintains the same length of the lever arms, thereby avoiding the disadvantages described in the embodiments described above, uses for each controlled heald blade a separately assigned cam or eccentric which controls the respective lever by its stroke length. This gray solution facilitates the adjustment of the shed mechanism of ism, but is both technically and fabrically expensive and demanding.

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SUMMARY OF THE INVENTION The object of the invention is to provide a reliable shed-forming device, i.e., to control the sheaves, which facilitates the assembly of the woven fabric without adjustment requirements, simplifies work with the sheaves and increases the economics of component manufacturing.

This is achieved by a shed forming device according to the invention, characterized in that the center of rotation of each of the two-arm levers is located off the center of rotation of the adjacent two-arm levers according to a specified stroke sequence.

However, the position given by the location of the pivoting centers of adjacent two-arm levers is always such as to ensure that the two arms of the two-arm levers are positioned substantially in the same plane, and with the same stroke of the two-arm levers.

According to an embodiment of the device according to the invention, the center of rotation of each of the two-arm levers is formed by separate pins whose centers are located on the arm of the hyperbola.

According to a further embodiment of the device according to the invention, the center of rotation of each of the two-arm levers is formed by a common pin whose inclination to the ground plane determines the transmission ratio of the individual levers which increases from the ground plane.

Further advantages and features of the device according to the invention are set forth in the following description and shown in the accompanying drawings, in which: Fig. 1 shows a schematic arrangement of a double-arm lever system; Fig. 2 shows a double-arm lever in an open shed; 4 shows a schematic arrangement of a double-arm lever assembly according to a second embodiment of the device according to the invention.

On the holder 1 (Fig. 3) is fixed a first pin 6, which carries a first two-arm lever 2, which is one end engaged with the cam track or the eccentric 4, and the other end is connected to the heald shaft 6 1).

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A second pin 21 is mounted on the first pin 2, on which the second double-arm lever (Fig. 3) is mounted. The center of the second pin 2.1 is displaced relative to the center of the first pin 2, thereby changing the arm ratio of the second two-arm lever 31 to the first two-arm lever χ. Similarly, all other pins 22, 23, 24, 25, and others are mounted, thereby defining a similar position of the other two-arm levers 32, 33, 34, 35 and others, i.e. always off center of the previous two-arm lever. Positions of the axes of pins 2,21,22, 23,24,25 and others are delimited by the hyperbola arm.

Each of the two-armed levers 3,31,32,33,34,35 or others is in contact with the cam or the eccentric 4 with its drive arm, the stroke of which is constant for all two-armed levers. Since the total length of all the two-arm levers 3,31,32,33,34,35 or others is substantially the same, an unevenly large stroke occurs on their driven arms.

In a second embodiment of the device according to the invention, the pins 2,21,222,22,24,2X or other two-arm levers 1,31,32,33, 31,31 and others (Fig. 4) are replaced by a single continuous pin 20, whose axis is an inclined line. This embodiment is advantageous in particular for manufacturing reasons and the achieved unequal stroke of the actuating arms of the two-arm levers, even with a certain deviation from the first embodiment, ensures trouble-free operation of the machine in its entirety.

Claims (3)

A device for forming a shed of a weaving machine, comprising a set of two-arm levers, one arm of which is engaged with the cam track or an eccentric, characterized in that the center of rotation of each of the two-arm levers (3, 31, 32, 33, 34) 35) located outside the pivot centers of adjacent two-arm levers according to a specified stroke sequence. Device according to claim 1, characterized in that the center of rotation of each of the two-arm levers (3,31,32,33,34,35) is formed by separate pins (2,21,22,23,24,25) whose centers are placed on the shoulders of hyperbola, Device according to Claims 1 and 2, characterized in that the center of rotation of all the two-arm levers (3,31,32,33,34,35) is formed by a common pin (20) whose inclination to the ground plane determines the transmission ratio of the individual levers that increases away from the ground plane.