Textiles: knitting – Feeding – Traversing guides – straight machine
Patent
1990-03-29
1991-06-04
Reynolds, Wm. Carter
Textiles: knitting
Feeding
Traversing guides, straight machine
D04B 1548
Patent
active
050203410
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a braking device on the thread guide box of a flat bed knitting machine which is slide mounted on a slide rail extending along the needle beds and which can be moved along the slide rail by the pin carriage in both directions of travel of the carriage in each case by a driving pin fitted onto the pin carriage.
As is known from DE-A-267777, DE-A-719964 or DE-A-2459693, a thread required to be processed on a flat bed knitting machine is fed to the working needles of the flat bed knitting machine coming from a spool via a small thread guide pulley in the conventional manner. The small thread guide pulley is attached to the thread guide box, which sits on the slide rail and is taken along by the driving pin in both directions of travel of the carriage.
The known complete thread guide box with thread guide pulley is always controlled so as to trail the knitting pin, where the size of the transverse movement of the knitting pin is determined. The thread guide box is braked with a known braking device on the thread guide box in the form of spring loaded braking wedges, where it may or may not be possible to control the braking force depending on the design, known via the publications Melliand Textilberichte No. 6/1955, p. 634 to p. 643 and Wirkerei-und Strickeri-Technik, Coburg, Dec. 1956, p. 20 to p. 23, so that now the thread guide box will always travel at constant speed. Pressure springs which cannot subsequently be adjusted will for example be mounted on the braking wedges, if it is required for the braking force to remain constant without it being possible to affect it.
The braking wedges are set up to approximately 0.1 mm on the contact surface of the slide rail by means of screws. The gaps between the screws and the brake wedges contain pressure springs, which press the brake wedges onto the contact surface of the slide rail and thereby produce the desired slide braking action.
The dynamic braking force, which in this case cannot be affected, is nevertheless subject to the tolerances of the pressure springs, which as a rule can vary by up to 30%. Should it be possible to influence the dynamic braking force by subsequent adjustment, then there will be the danger of it being set incorrectly by a non-expert and therefore making subsequent damage unavoidable.
The object of the invention is to provide a braking device of the type described above, which avoids the disadvantages of known braking devices and guarantees a uniform and constant dynamic braking action on the thread guide box.
This problem is solved by the invention in that at least one permanent magnet is fitted to the thread guide box in the area of the slide rail, which has a predetermined air gap with the magnetically conducting slide rail. The designer will therefore be able to determine the dynamic braking force positively and make it invariable during operation by suitably designing the permanent magnet and the air gap so that it will remain uniform and constant during operation.
Two permanent magnets are provided to advantage adjacent to the front sides of the thread guide box and aligned with respect to the central longitudinal axis of the slide rail. This produces a particularly uniform dynamic braking force during operation remaining permanently constant.
The slide rail preferably has a dovetail shaped cross-section, whereas the thread guide box has longitudinal guide slots with trapezoidal cross-sections matching the cross-section of the slide rail. This will lead to a particularly simple construction, easy to manufacture with little maintenance as well as evenly braked guidance of the thread guide box.
Adjustable guide wedges are favourably fitted in the area at least of one of the side walls of the longitudinal guide slots on the thread guide box, effectively to guide wedges adjacent to the front sides of the thread guide box. In this way it will be possible to achieve a fine setting for the guide of the thread guide box with the appropriate effect on the basic setting of the dynamic braking force be
REFERENCES:
patent: 4738124 (1988-04-01), Stoll et al.
Reynolds Wm. Carter
Universal Maschinenfabrik Dr. Rudolf Schieber GmbH
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