CZ278317B6 - Cam-operated shedding mechanism of a weaving machine - Google Patents

Abstract

Each individual radial cam (4) is formed as a circumferential cam with a front groove (5) and the outer track (8) of the front groove (5) forms a second cam track, whereas the circumferential cam (6) of the radial cam (4) is designed for the first roller (7) and outer track (8) of the front groove (5) for the second roller (9). Both rollers (7, 9) are fixed to a common sinker (12).<IMAGE>

Description

The invention relates to a shed cam device of a weaving machine formed by radial cams slid on the drive shaft.

Shed-up cam devices are known in which the movement of the shafts is generated by circumferential radial cams and the return to the initial position is effected by spring counter-pulls.

The disadvantage of this arrangement is the increased force stress of the whole mechanism caused by the bias, which is necessary to ensure the contact of the pulley with the track in the cam. The constant preload between the roller and cam, the size of which has to be increased with increasing speed of the weaving machine, adversely affects the required power input of the machine.

In another embodiment of the shed cam device of the weaving machine, radial double-rollers, made of two circumferential cams, whose paths correspond to the rollers of the double rocker arm, are used to move the heddle leaves.

The disadvantage of this solution is the width of the device and the high production costs resulting from the demands on the exact position of the cam tracks and the production of the associated lifting mechanism.

Another known solution is a shed device with radial groove cams, where a roller mounted on a sinker corresponds.

A disadvantage is the change of rotation of the pulley inside the groove when the sense of normal reaction between the pulley and the cam changes. This results in greater wear on the groove sides where the direction of rotation of the pulley is changed, the pulley wear and the alternating stress on the pulley pin to release it.

These drawbacks are eliminated by the shed cam device of the weaving machine consisting of radial cams mounted on the drive shaft, which cooperate with rollers mounted on the sinkers of the operating levers, which are connected by rods to the heald blades according to the invention. The radial cam groove is for the second pulley and the medical sinker. Preferably, the first pulley and the second pulley are attached to the common sinker so that the line of their axes of rotation is directed substantially to the axis of rotation of the radial cam drive shaft.

with a front groove, wherein the outer track has a front cam track, wherein the peripheral cam is for the first pulley and the outer track the front two pulleys are attached to the advantage of the shed cam device of the invention is lower energy intensity compared to the shed device with spring counterparts. Another advantage is try '~? production of cams against production demands of double-cams. Another advantage is that the direction of rotation of the rollers does not change during the rotation of the cam. This increases the lifetime of the cam and pulleys as well as the load carrying capacity of the pulley pins in the sinker because their load has changed from alternating to passing. This allows the turnover of the weaving machine to be increased.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE DRAWINGS FIG. 1 is a schematic view of a shed mechanism for lifting a single weave blade of a weaving machine; and FIG. 2 is a schematic sectional view. mutual arrangement of the radial cam, pulleys and sinkers.

The shed cam device of the weaving machine according to the invention with respect to FIGS. 1 and 2 comprises a drive shaft 1 and pins 2, 3 of a weaving machine frame, not shown here. A radial cam 1 with a front groove 5 is connected to the drive shaft 1. On the outer circumference of the radial cam 4, a circumferential cam track 6 is formed for the first roller 7 and an outer track 8 of the front groove 5 of the radial cam 4 forms a cam track for the second roller 9. The first pulley 7 and the second pulley 9 are on pins 10, 11, which are mounted on the sinker 12. The link 13 of the axes of rotation of the pulleys 7, 2 is directed to the axis of rotation of the drive shaft 1 of the radial cam 4. The ends of the sinker 12 are connected via levers 14, 15 mounted on the pins 2, 2 of the frame with the links 16, 17 of the brake blade 18.

When the drive shaft 1 is rotated, the radial cam is carried

4. Its circumferential cam track 6 corresponds to the first roller 7 on the pin 10 and the outer track 8 of the front groove 5 of the radial cam 4 forming the cam track corresponds to the second roller 2 on the pin 11. This causes the reciprocating movement of the sinker 12 and through the levers 14, 15. which are on the pins 2, 2 ^{and the} linkage 16, 17, the lifting and lowering of the heald shaft 18 occurs.

The shedding cam device of the weaving machine of the invention is useful in the textile industry.

Claims (2)

PATENT CLAIMS A shedding cam device of a weaving machine comprising radial cams mounted on a drive shaft, which cooperate with rollers mounted on sinkers operating levers, which are coupled to linkage leaves, characterized in that each individual radial cam (4) is formed as a peripheral cam with a front groove (5), wherein the outer race (8) of the front groove (5) forms a second cam track, wherein the circumferential cam track (6) of the radial cam (4) is for the first roller (7) and the outer race (8) of the front groove (5) is for the second pulley (9) and both pulleys (7, 9) are attached to the common sinker (12). A shearing cam device of a weaving machine according to claim 1, characterized in that the first roller (7) and the second roller (9) are fixed to the common sinker (12) and the axis of rotation (13) of the first roller (7) and the axis of rotation. the second roller (9) is directed to the rotational axis of the drive shaft (1) of the radial cam (4).