CS205638B1 - Fabric take-off tube for circular knitting machines - Google Patents

Abstract

Take-down tube in circular knitting machines, particularly small diameter circular knitting machines, which is fixed inside the needle cylinder is provided with a conical inlet part, whose outlet is smaller than the diameter of the take-down tube interior so that, the knitwork sucked off there-through cannot adhere to its inner walls, and tensioning thereof is considerably improved. The conical part may be provided with at least one slot in its lower part, whereby the tensioning of the knitwork is further improved. <IMAGE>

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

The take-off tube generally used on circular small-diameter knitting machines consists of a tube placed in the cavity of the needle cylinder, the inlet part of which usually has a widening conical neck, continuously connected to the inner space of the take-off tube. The take-off tube is further connected to an anti-twisting device, an exhaust fan, a scythe for collecting the article and the like. The inlet throat of the take-off tube is further provided with various projections, for example of wire, sheet metal and the like, in order to achieve an increased fastening of the take-off fabric formed on the needles of the knitting machine.

Other known exhaust pipes have an annular ring with guide flaps mounted in the inlet throat, which give the fabric a wavy shape in cross-section in order to increase the withdrawal effect. However, this projection ring has an inside diameter smaller or at most equal to the diameter of the exhaust pipe itself.

The disadvantage of the existing designs of the withdrawal tubes when rigidly connected to the needle cylinder when the withdrawal tubes rotate during knitting is that the knitted fabric in the cavity of the withdrawal tube adheres to its side under the effect of the flowing air. tensioning the knit, which adversely affects

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20S 638 quality of knitwear, eventually the exhaust is largely impossible ·

Further, the current designs of exhaust pipes are characterized by technological demands in the production of

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a tube having an enhanced effect which is simple and inexpensive to manufacture.

The object is solved by a withdrawal tube fixed in the needle cylinder cavity and provided with a conical inlet throat which is connected to the withdrawal device, the lower part of the conical throat extending into the cavity of the withdrawal tube being provided with at least one cut-out. The orifice of the present invention is characterized in that the outlet opening of the conical neck is smaller than the diameter of the cavity of the exhaust pipe.

The main advantage of the thus formed draw-off tube is that the knitted fabric formed on the needles of the knitting machine e sucked in by the draw-off air cannot adhere to the walls of the draw-off tube. Therefore, it places increased resistance to the flow of air and significantly improves the tension of the fabric. The exhaust pipe according to the invention is further simpler to manufacture than the present embodiment, since the conical inlet throat can be formed separately from the exhaust pipe, for example of sheet metal.

An exemplary embodiment of the exhaust pipe according to the invention is explained in more detail by the description and schematically shown in the drawing, wherein FIG. 1 shows a longitudinal section of the exhaust pipe, FIG. 2 shows a longitudinal section of the exhaust pipe with cut-outs.

The withdrawal tube 1 is fixed in the needle cylinder of the circular cylinder of a small diameter knitting machine. The upper end of the withdrawal tube 1 (Fig. 1) is provided with a conical inlet throat 2 comprising an inlet opening 2b and an outlet opening 2a. The inlet opening 2b of the conical inlet nozzle 2 is located approximately at the level of the withdrawal plane of the sinkers 6 and its outlet opening 2a extends into the cavity 1 of the outlet tube 1.

The withdrawal tube 1 can be rigidly connected to the needle cylinder (not shown) and rotates together with it during rotation of the needle cylinder, or it can be rotatably mounted therein so that it does not rotate with the needle cylinder. as an anti-twisting device, a blower fan and the like

The conical inlet neck 2 comprises an upper part 2c which is larger than the diameter of the cavity 1a of the exhaust pipe 1 and a lower part 2d which extends into the cavity. 1a, therefore, it does not directly connect the drain pipe 1, but rather extends beyond the door. a cut-out 4 may be formed in the lower part 2d of the conical neck 2, but preferably several cut-outs 4 may be provided, thereby producing teeth 3 between the cut-outs 4 (FIGS. 2, 3);

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The exhaust pipe according to the invention works as follows:

The air that is extracted by the fan flows in the exhaust pipe 2 away from the inlet branch 2 ^{to the} exhaust pipe 1 in the direction of the arrows shown in Fig. 1. Because the inlet opening 2b of the conical inlet branch 2 is located approximately the formed article is sucked into the conical neck 2a by the flowing air. and thereby 1 into the exhaust duct 1 · The outlet opening 2a · which extends into the exhaust duct 1 is smaller than the diameter of the cavity 1a of the exhaust duct 2 δίπιζ preventing the article from adhering to the wall · The knitted fabric thus imparts increased resistance to the flowing air, is stretched in the direction of the flowing air and drawn away from the knitting needles. · When the bottom 2d of the conical inlet neck 2 is provided with cutouts achieves a further increase in knit resistance and is pulled even more intensively from the knitting needles ·

The inlet throat 2 with cut-outs 8 is therefore advantageously used in the case where the exhaust pipe 1 rotates together with the needle cylinder during knitting, since in this case the suction effect of air is the smallest in the existing exhaust pipe designs.

Furthermore, the inlet neck 2 with the cut-outs 6 can be advantageously used in the case of knitting of knitted fabrics in high extensibility, since by drawing the knitted fabrics into the cut-outs 6 it is easier to enter the knitted fabric into the take-off tube 1.

Claims (1)

SUBJECT OF THE INVENTION A withdrawal tube of a circular knitting machine, in particular of a small diameter, fixed in the needle cavity and provided with a conical inlet throat which is connected to the withdrawal device, the lower portion of the conical throat extending into the withdrawal tube cavity. characterized in that the outlet opening (2a) of the conical neck (2) is smaller than the diameter of the cavity (1a) of the exhaust pipe (1).