Sheet feeding or delivering – Feeding – Separators
Patent
1990-11-14
1992-05-19
Skaggs, H. Grant
Sheet feeding or delivering
Feeding
Separators
221213, 294 61, B65H 322
Patent
active
051141329
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for taking up, assembling, transporting and positioning a single, plane workpiece in the dry, pre-impregnated or wet state, or a number of such workpieces, with a base plate and at least two needle bars arranged parallel to one another, with needles pointing diagonally downwards, intersecting when viewed from the side, whereby the needle bars are moved divergently during the piercing movement in the direction of the needles only, so that the workpiece pierced by the needles remains closed between the base plate and the needles but loose in its plane.
Such devices are required for taking up, transporting, positioning and assembling fibre-reinforced materials and for the separation of stacked, preferably netted or nonwoven, substantially porous workpieces, in order to be able to include woven, knitted or feltlike fabrics, but also natural and synthetic leather in the making up process or in other treatment, processing, manufacturing or reinforcing processes, manually, mechanically or automatically.
According to the prior art, there is a prevailing view that a device of this kind has to clamp and stretch the workpieces. The proposals in construction and descriptions are in line with this maxim. In order to make this common disadvantage understandable, we would refer you to the processing of fine, so-called surface bonded fabrics, which are used to increase (double !) the long-term impact strength and to increase the chemical resistance of fibre-reinforced plastics. Such substances should be treated aseptically as in the making up of dressings, and would therefore be particularly suitable for machine processing. A bonded fabric made of polyester filament has for instance, at 11/2 denier, 15 grammes weight per square metre, a thickness of only 0.07 millimeters. Even if the devices proposed could hold workpieces as fine as these, they would tear the fine structure of the filaments in places as a result of the mechanical stress desired, thereby altering them so that visually distrubing places on the surface and notched places would appear in the resistance test. There is a similar situation for example with the processing of fine leather, which cannot be considered for automatic processing as a result of inevitable damage to the surface caused by the devices according to the prior art. We would also refer specifically to the manufacture of high-performance materials, which are processed dry, or pre-impregnated with a matrix (so-called pre-pregs), or wet, and like the porous materials cannot be taken up, transported or positioned by underpressure. With these workpieces the geometry of the structure is of decisive importance so far as the subsequent resistance quality is concerned, so it should also be possible to take up and maintain these workpieces in their plane without mechanical stresses.
The prior art applicable is the DE 3101705 with a large number of literary references. The device described therein with needle bars and needle pairs, whereof one needle respectively is fixed and the other describes a curve of movement, has the disadvantage that it seeks to clamp and stretch the workpiece. In addition it can only be adjusted to the thickness of the workpieces for separation by means of a complicated height adjustment. A similar construction of the device is described without reference to the need for or possibility of a height adjustment in the Austrian printed patent specification 238640. Here a number of needle bars (referred to therein as carriers of needles) with divergent, i.e. crossed needles are pressed against the workpiece and are then moved in opposition "so that the points of the needles . . . penetrate the layer of fabric (workpiece) and exert a kind of spreading effect, whereby the layer of fabric (workpiece) is held fast" (page 2, lines 27-28).
The device proposed in the DE 3040197 has a central height adjustment, thereby allowing an adjustment to the material thicknesses in batches, but this adjustment can only be effected empirically, i.e. the needles are at
REFERENCES:
patent: 4613123 (1986-09-01), Franke
Arato Laszlo F.
Schell Ferenc
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