Textiles: knitting – Needle cooperating elements – Pile loop formers
Patent
1998-02-26
2000-08-01
Falik, Andy
Textiles: knitting
Needle cooperating elements
Pile loop formers
66 90, 66 93, D04B 912
Patent
active
060949449
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
In manufacturing velour-like textiles, the process of severing pile loops in pile forming machines is of considerable economical and ecological importance, inasmuch as the subsequent shearing of loops necessarily results in considerable loss of pile material. Such losses can be avoided by producing cut pile textiles.
2. Description of the Prior Art
In the past, a plurality of methods for manufacturing cut pile textiles have been developed. Regardless of the type of materials being used to make the product, however, only those methods which severed pile loops by two cutting edges, cooperating in a scissor-like manner, were successful under practical conditions.
Early proposals of this type of mechanism for manufacturing cut pile fabrics on loopwheel machines are described in DE-A-73 161, DE-A-77 975 and DE-A79 328 (corresponding to U.S. Pat. No. 2,579,621). A cutting element is associated with each pile element or sinker. The cutting element is mounted together with or separately from the pile element and is actuated relatively thereto for severing pile loops. The cutting edge of the cutting element is disposed at an angle, usually called an opening angle, with the cutting edge of the pile element, such that both edges are disposed in a V-like configuration prior to the cutting movement which brings them together like a pair of scissors.
This basic concept was subsequently transferred to manufacturing carpets in tufting machines, as described in U.S. Pat. No. 2,335,487, and to the manufacturing cut pile fabrics on circular knitting machines, for example, according to DE-A2-11 53 452 and DE-A2-15 85 051.
Particularly in the case of a laterally adjacent arrangement of pile elements and cutting elements, the cutting movement has been performed with an inadequate side pressure between the cutting edges. Therefore, it is easily possible for the cutting edges of the cutting and pile elements to be deflected by the unsevered pile loops encircling the pile elements. This may happen particularly if the pile loops are tightly enclosed around the pile elements and if the pile yarn is, furthermore, a material having high tenacity and/or abrasion resistance.
In order to obtain increased contact pressure between the cutting elements and the pile elements, and to permit the possibility of setting such contact pressure in accordance with the pile yarn material, the cutting elements on tufting machines were mounted separately from the pile elements and, starting out on the side of the active flank of the pile element, i.e. the flank comprising the cutting edge, were arranged to resiliently contact the latter at a relative inclination or pressurized contact angle.
Since the nibs of the cutting elements contact the pile elements as a result of the inclined arrangement of the cutting elements, a risk is created of obstructing contact between the cutting edges of the cutting elements and the cooperating cutting edges of the pile elements, and the flanks of the cutting elements are also arranged to be inclined with respect to the pile elements. Therefore, prior to the cutting movement, the cutting edges of pile elements and cutting elements have a corresponding overlapping configuration, referenced as a cutting angle, and the elements have only one point of contact. This point of contact shifts during the cutting movement from the lower ends of the cutting edges across their entire length to their upper ends and in the process deflects the overlapping part of the cutting elements from the pile elements. The gap created thereby is to prevent pinching of severed pile loops and deflection of the cutting edges being separated.
Therefore, this cutting angle between the two elements is of particular importance. The cutting angle must be dimensioned to sufficiently separate the elements after the cutting point and to also avoid pinching of pile loops. In tufting machines, the cutting movement is performed by a relative movement of the mounting bar of the cutting elements in paralle
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patent: 3041859 (1962-07-01), Anderson et al.
patent: 3879962 (1975-04-01), Mahler
patent: 4127013 (1978-11-01), Nuber
patent: 4592212 (1986-06-01), Schmidt
patent: 5463882 (1995-11-01), Yeh
Adtec Services Limited
Falik Andy
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