Device for carrying out the programming of rotary dobbies in weaving machines

Abstract

The present invention provides a device for carrying out the programming of rotary dobbies for the operation of heald frames in weaving looms, of the type in which the control rods (3) of the heald frames are operated by connecting rods (2) each mounted on an eccentric ring (5) rotating with respect to the main shaft (1) of the dobby, said device comprising, for each frame, a C-shaped lever (14) caused to oscillate about a fixed point (14C) so that the toothed ends (14A, 14B) of the same lever position themselves either along or outside the trajectory of the end (8) opposite to the toothed end (11) of a selection lever (7), in order to cause or prevent the engagement of the selection lever with a rotating disc (13), characterised in that positive controls are provided causing the C-shaped operating levers (14) to oscillate, said positive controls being synchronised with the rotation of the loom main shaft and obtained, independently for each heald frame, by means of a rotary electric motor.

Description

technical field [0001] The invention relates to a device for executing the program of a rotary dobby for the manipulation of heald frames in a weaving machine, said device being of the type comprising an improved motor control device. technical background [0002] As everyone knows, the positioning of the heald frame in the weaving machine or loom must be carried out in a predetermined order, the configuration of the weft of the finished fabric can be obtained through the positioning of the heald frame, and the positioning according to the order defines the position of the heald frame in the main shaft every time. The positions in which the individual heald frames have to be during rotation thus result in the control of the oscillating device which itself steers the heald frames so as to obtain one of the two (high / low) required positions for them. [0003] Since the dobby spindle is steered according to an intermittent cycle, with a dead center at every 1 / 2 turn through 180...

AI Technical Summary

Problems solved by technology

[0004] However, it is well known in the prior art that the large number of devices used to carry out the procedure of the dobby mechanism has a number of disadvantages, including the need to stop the main shaft every 1 / 2 revolution, thus having the necessary time to clear the previous Program operation and loading a new program for the next 1 / 2 revolution

It is obvious how this type of program running device leads to increased downtime of the loom, to the detriment of the production time of the loom

[0005] In the most widely used known type of device (comprising a single control, for both forward and reverse motion, such that the time for pressing the operating lever mechanism is synchronized with the centerline of the motion diagram) Another type of disadvantage encountered is the high possibility of error during the selection of whether to move in the clockwise or counterclockwise direction, moreover, for the device when it is required to position the weft yarn and reset it for drawing-in Performing a few 1 / 2 turns at zero load is essential when correct shedding

Images