Device for controlling the transverse movement of at least one t

Details Device for controlling the transverse movement of at least one t Device for controlling the transverse movement of at least one t

1999-05-26

2000-06-27

Calvert, John J.

Textiles: weaving

Warp manipulation

Shedding

139 551, 139 35, D03C 1300

Patent

active

060794550

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Technical Subject
The innovation disclosed hereunder consists in a device for controlling at least one thread in a textile machine, especially a warp thread in a weaving loom.
2. State of the Art
Numerous devices for the controlling of the transverse movement of a thread in a textile machine, especially a warp thread are well known to those learned in the art. The threads are threaded through and guided by the eyes of heddles which are moved, according to a determined programme and via connecting structures, by different driving devices such as jacquard machines, heddle looms, treadle looms and colour control units. These machines and devices involve large numbers of different components, which unavoidably exerts a negative influence on the speed of the thread control mechanism. The already disclosed systems are additionally characterised by the following significant disadvantages: high forces of gravity, significant wear and tear, great emission of noise, significant vibration, enormous space requirements, high production and operating costs, poor ergonomic characteristics, etc.
So far, many attempts were made to eliminate these disadvantages.
Under U.S. Pat. No. 3,867,966, for example, a device of the type mentioned above was disclosed which attempts to eliminate the disadvantages described by way of introduction. This device comprises a dragging element inserted between two springs, which serves to drag at least one thread. An arresting device controlled by means of a control unit serves to temporarily arrest the dragging element in at least one extreme position. The dragging element is designed in the form of a heddle, which comprises a ribbon section, which contains a conductor and is located between two isolators. This ribbon section runs over a roller, which can be electrically activated. As soon as electrical current is fed to the roller or to the ribbon section, respectively, friction between the roller and the ribbon section increases so that the ribbon section can be dragged by the roller and moved to an extreme position where magnetic arresting devices are located which arrest the heddle as long as the electrical arresting devices are activated. A considerable disadvantage of this type of device, however, consists in the fact that the heddle must be equipped with a ribbon section, which contains electrically conducting elements and that dragging is effected by friction only. This causes high wear between the roller and the ribbon section. Additionally, even friction between the ribbon section and the roller cannot be guaranteed, because friction is constantly changing due to both wear and the accumulation of dirt.


SUMMARY OF THE INVENTION

The purpose of the invention disclosed hereunder consists in further improving a device of the type mentioned above.
The invention's characterising features employ springs and a dragging element. As the springs and the dragging element are designed as a system that oscillates freely at its natural frequency, the system, once activated, continues to oscillate independently, the only further requirement consisting in supplying a sufficient amount of energy to make up for system-related losses of energy, e.g. due to friction, etc. This energy supply, however, can be effected by extremely simple means.
Thus an extremely simple and economically viable device for controlling the transverse movement of at least one thread of a textile machine can be designed. Additionally, the design stands out for good wear-resistance and requires only a small energy supply to keep it operating. The arresting device allows selective control immediately at the thread-dragging element. With only few components and good wear-resistance, the device allows significantly higher drive speeds.
Several different advantageous designs are available.
One design allows programmed controlling of the device by very simple means.
In one design which is particularly advantageous an additional individual control can be achieved, for example, by keeping one shed open

REFERENCES:
patent: 3867966 (1975-02-01), Wieland
H. Haase: "Die Zukunft de Jacquardmaschine" Textil-Praxis International, Bd.30, Nr.3, Marz 1976 S.287-291, XP002052007, siehe S.250; Abb. 15 Muhlmann, Rainer, Rudolff, Erich: "Einsatz viskoelastischer Werkstoffe als Ruckzugsfedern in Jacquardwebmaschinen", In: Melliand Textilberichte Feb. 1991, S.103-108.

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