Abstract:
A description is given of an apparatus for selectively covering suction holes in a circumferential surface of a suction roller for transporting flat pieces of material of a given format, wherein the apparatus comprises a flexible ribbed sheet, which has a multitude of raised ribs and grooves respectively running between the ribs, wherein suction passageways that pass through the ribbed sheet are arranged in the ribs. The object is to develop this apparatus in such a way that pieces of flat material of a wide variety of formats can be transported and peeled off from the circumference of the roller with lowest possible costs. To achieve this object, it is proposed to make the arrangement of the suction passageways in the ribbed sheet correspond substantially to the arrangement of the suction holes in the circumferential surface of the suction roller and additionally provide the apparatus with a flexible masking sheet with suction openings passing through it, which are arranged in accordance with the format of the pieces of flat material to be transported, so that when the masking sheet and the ribbed sheet are arranged lying one on top of the other on the circumferential surface of the suction roller a suction effect is only produced in those regions of the circumferential surface in which it is desired, in accordance with the format of the pieces of flat material.
Abstract:
The invention relates to a coiled sheet (B) of a roll (W). The aim of the invention is to improve the pulling effect of a roll such as a sand roller (6), a breast beam (5), or a cloth beam (7) in a weaving machine (3). The coiled sheet has an outer layer (11) that has a highly pulling effect, for example that has a high roughness, said outer layer (11) clinging to an inner layer (12) so as to secure its position. According to the invention, it is unnecessary to use an adhesive such as a glue. To this end, the inner layer (12) or the system (V) of the inner layer (12) and the outer layer (11) is highly rigid, especially in a direction transverse to the longitudinal direction (arrow y) of the coiled sheet (B), thereby preventing ondulations from being produced at usual loads on the roll (W).
Abstract:
The invention relates to a winding strip (B) for a roller (W), serving to achieve an improved drawing value, on for example, a roller for a textile machine, a paper machine, a film machine a drive roller in transport units or similar. Said strip comprises an outer layer (11) of high drawing compatibility, for example of high roughness, whereby the outer layer (11) is connected to an inner layer (12) with positional stability. According to the invention, a winding strip whereby the roller may be equipped with a secure fixing without the use of an adhesive as fixative, which must be laboriously removed from the roller on renewing the winding strip may be achieved, whereby the inner layer (12), or the joint (v) between the inner layer (12) and the outer layer (11) comprises a high stiffness, in particular perpendicular to the longitudinal extent (arrow y) of the winding strip (B), which does not permit corrugations on the roller (W) under normal loads.
Abstract:
Conveying apparatus comprising: (1) a conveyor belt comprising a load bearing belt having an exterior surface and an interior surface, the belt having a plurality of channels therethrough, (2) mounting material on the exterior surface of the belt, and (3) a resilient engagement covering. Also a method of using the apparatus in conjunction with means for applying a negative pressure.
Abstract:
The invention relates to a device for handling a printing material (6) in a printing machine with first and second guide baffles (4, 5) below and/or above the transport path of the printing material (6) such that they form a guiding slit (8). In order to more accurately guide a printing material (6) inside a printing machine, in particular into additional regions for processing the printing material 6), at least one guide ramp (2, 3), which at least locally constricts the guiding slit (8), is suggested in the region of the first guide baffle (4) and/or in the region of the second guide baffle (5).