GB2038378A

GB2038378A - Take-down Tube for Circular Knitting Machines

Info

Publication number: GB2038378A
Application number: GB7943355A
Authority: GB
Original assignee: Elitex Zavody Textilniho; Elitex
Current assignee: Elitex Zavody Textilniho; Elitex
Priority date: 1978-12-21
Filing date: 1979-12-17
Publication date: 1980-07-23
Also published as: GB2038378B; DE2950029C2; CS205638B1; DE2950029A1

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

SPECIFICATION Take-down Tube for Circular Knitting Machines The present invention relates to a take-down tube in circular knitting machines, particularly small diameter circular knitting machines, said take-down tube being fixed inside the needle cylinder, provided with a conical inlet part, and connected to the take-down motion.

Take-down tubes generally used in circular knitting machines of the small diameter type are formed by a tube, located inside the interior of the needle cylinder, the inlet part of said tube being usually provided with a widening conical neck which continues the actual inner space of the take-down tube. Furthermore, the take-down tube is connected to an antitwist device, an exhaust fan, a basket for assembling knitwork etc. The inlet part of the take-down tube is further provided with various projections, made e.g. of wire, metal sheet and similar materials, in order to achieve an enhanced tensioning of the knitwork to be taken down, which was produced on the needles of the knitting machine.

The disadvantage of the hitherto known embodiments of take-down tubes fixed to the needle cylinder, which rotate during the knitting process together therewith, consists in that the knitwork in the interior of the take-down tube adheres to the wall. By the action of the air flow, thus reducing the resistance of the knitwork against the flowing air and, consequently, also the tensioning thereof, this having an unfavourable effect upon the quality of the knitwork, or possibly making the take-down impossible to a considerable extent.

Furthermore, the embodiment of take-down tubes as known hitherto, are complicated as to their technology of manufacturing.

The purpose of the present invention is therefore given by making a take-down tube having a higher effect, which is simple in its construction and not expensive. The purpose is achieved by the take-down tube according to the present invention, of which the subject matter consists in that the outlet opening of the conical neck is smaller than the interior diameter of the take-down tube.

The main advantage of a take-down tube made in such manner consists in that the knitwork formed on the needles of the knitting machine and sucked off by the air through the take-down tube cannot adhere to the walls thereof. Thus, the knitwork resists the air flow to a higher extent, whereby its tensioning is considerably improved.

The take-down tube according to the present invention is further simpler as to its production than the embodiments known hitherto, as the conical inlet part can be made separately from the remainder of the take-down tube, e.g. from metal sheet.

The conical neck of the take-down tube according to the present invention is further advantageously provided with at least one slot in the lower part thereof, which opens into the outlet opening within the interior of the take-down tube, whereby the tensioning effect of the air flow is still increased.

An embodiment of the take-down tube according to the present invention is further expiained in the following description, by way of example, referring to the accompanying diagrammatic drawings, of which Fig. 1 represents a longitudinal section through the take-down tube; Fig. 2 a longitudinal section through the takedown tube provided with slots; Fig. 3 a plan view of the conical inlet part.

In the interior of the needle cylinder of a small diameter circular knitting machine is fixed a takedown tube 1. The upper end of the take-down tube 1 (Fig. 1) is provided with a conical inlet part 2, comprising an inlet opening 2b and an outlet opening 2a. The conical inlet part 2 is fixed to the take-down tube 1. The inlet opening 2b of the conical inlet part 2 is iocated approximately at the level of the knocking over plane of the knock over sinkers 6, and its outlet opening 2a engages the hollow interior 1 a of take-down tube 1. The take down tube 1 might be fixed to the needle cylinder (not shown), rotating thereby together therewith upon its rotary motion, or arranged therein pivotally, thus not performing the rotary motion together with the needle cylinder.The take-down tube 1 is further connected to known and commonly used devices, such as an antitwist device, an exhaust fan, and the like.

The conical inlet part 2 comprises an upper part 2c, which is larger than the inner diameter of the take-down tube 1, and a lower part 2d, which engages the interior 1 a, and thus does not continue immediately from the edge of the actual take-down tube 1, but overlaps it. In the lower part 2d of conical part 2, a slot 4 might be formed, advantageously a plurality thereof, between which are thus formed claws 3 (Figs. 2, 3).

The take-down tube according to the present invention operates as follows: The air, sucked off by the exhaust fan, flows in the take-down tube 1 in the direction from the conical inlet part 2 into the take-down tube 1 in the direction of arrows, shown in Fig. 1. As the inlet opening 2b of the conical inlet part 2 is located approximately at the level of the knocking over plane of the knitting needles, the knitwork thus formed is sucked by the air flow into the conical part 2, and thus into the take-down tube 1. The outlet opening 2a, engaging the take-down tube 1, is smaller than the inner diameter of the take down tube 1, as the air penetrating the knitwork prevents its approaching close to the wall of the take-down tube 1. The knitwork thus exerts a high resistance to the air flow, is tensioned in the direction of the flowing air and withdrawn from the knitting needles. When the lower part 2d of the conical inlet part 2 is provided with slots 4, the knitwork is drawn into said slots by the air flow, this resulting in a still higher resistance of the knitwork, which is thus withdrawn from the knitting needles even more intensively.

The inlet part 2 with slots 4 is thus advantageously used in the case when the takedown tube 1 rotates upon knitting together with the needle cylinder, as in this case the suction effect of the air is miniumum in the embodiments of the take-down tubes known hitherto.

The inlet part 2 with slots 4 can be further advantageously used in the case of producing knitwork of high extensibility, as by drawing the knitwork into the slots 4 said knitwork enters the take-down tube 1 in an easier manner.

Claims

1. A take-down tube for circular knitting machines, said tube in use being fixed inside the hollow of the needle cylinder and being connected to a take-down motion, and having a conical inlet branch, characterised in that the outlet opening of the conical part is smaller than the inner diameter of the take-down tube.

2. A take-down tube us claimed in Claim 1, in which the lower part of the conical part engaging the interior of the take-down tube is provided with at least one slot opening into the outlet opening of the conical part.

3. A take-down tube substantially as herein described with reference to and as shown in Fig. 1 or Figs. 2 and 3 of the drawings.