Apparel apparatus – Turning
Reexamination Certificate
2000-10-03
2001-10-02
Mohanty, Bibhu (Department: 3765)
Apparel apparatus
Turning
C223S040000, C223S043000
Reexamination Certificate
active
06296159
ABSTRACT:
Subject of the present invention is a device for turning tubular textile products inside out.
According to this disclosure the device can be used on hosiery production lines to introduce the intermediate stage of turning the open tubular product inside out before proceeding to close one end of the tube.
As is well known, the making of hosiery involves the use of circular machines designed for production of tubular textile products open both at the area of the upper edge and at the toe end.
At this point, in order to complete the manufacturing cycle the toe end of the product must be closed to make it usable by the consumer.
Closing the end consists of making a seam at one end of the hose. To give the finished product a better appearance, this seam is generally made with the hose turned inside out so that any anomalies connected thereto will be inside and therefore unseen.
As the circular machines knit the tubular product with a plain stitch, it must be turned inside out once before going to the finishing stage. Then, once the toe end has been closed the hose must of course be turned inside out again before packing.
These turning operations were usually done manually by workers on the production line, once before sending the hose to the finishing machine and again afterwards.
At present the finishing machine comprises special equipment that automatically and efficiently turns the hose a second time and no particular difficulties arise.
To improve efficiency and working times in turning the hose inside out the first time, one known technique involves the use of semi-automatic machines in which an operator fits the textile product to be turned onto a tube, holding it at the edge, and sliding it along till the toe end reaches the tube's initial opening.
At this point a suction mechanism comes into action with a stream of air that forces the toe of the hose inside the tube, turning it inside out, while the operator slides the hose onto the tube. When the completely turned hose enters the tube the whole of it is drawn inside and taken pneumatically to a collecting station.
In order to eliminate this type of manual operation as well, since it usually slows down production and increases costs, the makers of circular machines have designed special automated systems to go with the circular machines in use.
For example, the circular machines with double roller have been fitted with a suction roller at the top so that by starting suction the hosiery is produced already turned inside out.
In the case of the circular machines with a single roller, these have been fitted with a device that turns the hose inside out during its formation.
Although this solves the problem of a completely automated process, some serious problems remain even so.
The best results are in fact realizable only with double roller machines of the most recent production.
As far as concerns previous models of machines, still widely used, it is often difficult to adopt these devices and even, in some cases, inadvisable and uneconomic.
With regard to the single-roller circular machines, on the other hand, the built-in device for turning hose inside out has been found un-economic when used on both new and old types of machines.
It must be noted in fact that addition of a turning device requires perfect synchronization and very high coupling tolerances between the two devices to get the best performance.
It is no easy matter to realize these changes and it is also clear that an error in synchronization of the parts during operation would cause the hose being produced to ruffle up and be spoilt, as well as loss of time while adjusting the machine; even worse, however, would be the damage done to various component parts of the device and especially to the needles.
It is also important to note that each circular machine must be fitted with its own personal system for turning the product inside out which means that for each machine such a turning device must be designed and assembled.
Purpose of this present invention is therefore to remove the above drawbacks to a substantial degree.
An initial aim is to realize a device that functions separately from the circular machines so as to avoid any problem of synchronization or interference with them during the production process.
A further aim is to realize a device that can execute the first turning operation on the tubular product by a previously fixed number of circular machines, generally more than one and differing one from another.
A further aim still is to realize a device able to execute the first turning operation on textile products of different sizes and types.
These and other aims, to be explained during this description, are substantially achieved by a device for turning tubular textile products inside out as will be described in the claims that follow.
Further characteristics and advantages will become clear from the detailed description of a preferred, but not exclusive, form of execution of a device for turning tubular textile products inside out according to this present invention.
REFERENCES:
patent: 5392970 (1995-02-01), Orosei
patent: 29 31 566 (1981-02-01), None
patent: 0 430 900 (1991-06-01), None
patent: 0 679 746 (1995-11-01), None
patent: 91 07540 (1991-05-01), None
Mohanty Bibhu
Striker Michael J.
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