摘要:
The hot stamping cylinder (1) is provided with a heating system which consists of a heating film (3) which is arranged on the inner wall of the cylinder (1), enabling extraordinarily quick heating and cooling times. In addition to actually heating the surface of the cylinder and the annular or sleeve-type stamping tools (10) placed thereon, the latter are clamped by thermal expansion in said adjusted position.
摘要:
The invention relates to a device for axially adjusting guides for paper web infeed means of rotary printing machines. According to the invention, different alignments of the paper infeed means can be set, said alignments being distanced from the lateral mount.
摘要:
According to an inventive method for fastening a flexible plate with bent hanging limbs on a printing machine cylinder, a plurality of plates are arranged on the periphery. By actuating a first clamping device (14), only the rear hanging limb (07) of a plate (02) is firstly released. By actuating a second clamping device (16), the front hanging limb (06) of the plate is released. The invention also relates to a corresponding device.
摘要:
In a web guiding system for a rotary printing press, printed webs, in particular, are deflected without smearing in that the acting diameter of a rubber-covered cylinder of a printing mechanism corresponds to the diameter of a driven web guiding roller or, in certain conditions, to an integral multiple of this diameter.
摘要:
The doctor portion of the ink cup (22) of a pad printing machine (10) is formed of a polymeric composite which has high compressive strength and high resistance to chemicals, notably to printing inks. The polymeric doctoring portion is tapered and defines a narrow distal end surface which circumscribes the open end of the cup (22) for doctoring engagement which an opposed plastic gravure surface (17). The doctoring portion may be a separate ring element (24) suitably mounted at the open end of the cup body or it may be a unitary part of the cup (22). In a preferred embodiment, this doctoring portion is a ring (24) formed of a polymer composite reinforced by carbon fibers and which is permeated by lubricant particles or granules of graphite.
摘要:
A doctoring cup (14) particularly suited for inking non-flat plates (12) includes a plate contacting edge (24) with an "Ease of Flex" parameter greater than about 0.020 lb . Ease of Flex is defined as 1/Mt , where t is the thickness of the plate contacting edge (24), and M is the flexural modulus of the material from which the cup wall (18) defining the edge (24) is formed. By non-flat plates (12) is meant plates out of flat by greater than 0.0002 inches/inch. The doctoring cup (14) can be used to ink both flat and non-flat printing plates (12) using a doctoring pressure of less than about 300 psi.
摘要:
A doctoring cup (14) particularly suited for inking non-flat plates (12) includes a plate contacting edge (24) with an 'Ease of Flex' parameter greater than about 0.020 lb-1. Ease of Flex is defined as 1/Mt2, where t is the thickness of the plate contacting edge (24), and M is the flexural modulus of the material from which the cup wall (18) defining the edge (24) is formed. By non-flat plates (12) is meant plates out of flat by greater than 0.0002 inches/inch. The doctoring cup (14) can be used to ink both flat and non-flat printing plates (12) using a doctoring pressure of less than about 300 psi.