Device for powdering printed products
OwnerHans Georg Platschinventor
Life of this patent
Estimating the term…
Abstract
For powdering printed products it is proposed that they be moved through a nip formed by a powder application roller (38) and a support roller (32). Those two rollers have axial circumferential recesses (52, 54) which are each able to receive at least part of a gripper rod (24) moving a printed product and which are synchronized with the movement of a gripper rods. At a location upstream of the nip in the direction of rotation, powder is applied to the circumferential surface of the application roller (38) by a nozzle strip (62), which powder is then transferred in the passage nip from the application roller to the printed products.
Claims23
Apparatus for powdering printed products in a printing machine through which the printed products are moved by gripper rods (24) comprising:
- a flexible conveyor (22),
- gripper rods (24) carried by the flexible conveyor (22),
- a reservoir (68) for powder material,
- a device (70) for delivering a metered powder stream from the reservoir (68),
- an application head (30) which applies the metered powder stream to the printed products moved past it, the metered powder stream being distributed over the width of the printed products, the application head (30) having an application roller (38),
- a powder feeding element (62, 144) cooperating with the application roller (38) and being loaded with the powder stream by the delivery device (70) and distributing the powder stream over the length of the application roller (38), and
- a support element (32, 38) which supports the reverse sides of the printed products,
- the circumference of the application roller (38) corresponding to the distance between successive gripper rods (24) on the flexible conveyor (22) and having at least one axial surface recess (52) capable of receiving the gripper rods (24) at least partially, the circumferential surface of the application roller (38) being tangential to the path of the printed products,
- the powder feeding element (62, 144) being arranged upstream of the nip defined by the application roller (38) and the support element (32, 38') viewed in direction of rotation, the powder material transferred to the printed products being carried by the surface of the application roller (38), and the printed sides of the printed products being in positive mechanical contact with the application roller (38), while being moved between the application head (30) and the support element (32, 38').
Dependencies are inferred from the claim text.