Printing – Antismut device – Drying with fluid or by heating
Patent
1996-08-28
1998-07-14
Burr, Edgar S.
Printing
Antismut device
Drying with fluid or by heating
101488, 34266, 432242, B41F 3500
Patent
active
057787883
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for offset presses and includes an air-infra-red (IR) drying box, through which ready-printed sheets are caused to be conveyed with the aid of gripping means, for the purpose of drying pigment deposited on the sheets.
A continually recurring problem with the installation of IR drying boxes in offset presses is that the IR lamps radiate to some extent heat up metallic parts of the press, including its frame sides and the gripping means conveying the sheets. Several attempts have already been made to screen off the IR lamps, but the problem lies with the gripping means that have to pass the place where the box is mounted.
SUMMARY OF THE INVENTION
The object of the present invention is to achieve an effective heat barrier in offset presses, the barrier allowing the gripping means to pass while at the same time preventing the heat radiation from the IR lamps from spreading to the different machine parts of the press. The distinguishing features of the invention are heat resistant brushes arranged at the gaps laterally delimiting at air-IR drying box so that the sheet supports can extend outside the box through the brush material while the brush material defines a heat barrier for the box.
Due to the present invention there has now been achieved an effective heat barrier in offset presses of the kind mentioned in the introduction, the barrier fulfilling its purpose in an excellent manner, while at the same time it is both simple and cheap to manufacture, as well as easy to fit. The inventive heat barrier comprises heat resistant brush material arranged at the gaps laterally delimiting an air-IR drying box and its IR lamps, this box being mounted on an offset press. This brush material is made from a heat-resisting substance, which is also heat-insulating and flexible. It is therefore possible to mount and adjust mutually opposing lengths of the brush material such as to completely cover the gaps laterally delimiting the box, while allowing passage of gripping means through it, since filaments of brush material will be deflected as respective portions of the gripping means come into contact with them, and will return immediately to their original attitudes after passage of the gripping means. The brush material does not cause any damage to the portions of the gripping means with which it engages, and it can be supplied with relatively long brush filaments that can be trimmed to a suitable length on installation. In addition, a brush comprising the brush material may be fastened to a rail, which is flexible in the conveying direction of the sheets, curved guides used with the gripping means thus not causing any problem.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in more detail with the aid of a preferred embodiment example and with reference to the accompanying drawing, which depicts a schematic, perspective view of an air-IR drying box installed on an offset press.
DESCRIPTION OF A PREFERRED EMBODIMENT
As will be seen from the drawing, the air-IR drying box 1, intended for mounting on an offset press, is adapted to accept ready-printed sheets 2 for drying the pigment deposited thereon, these sheets being conveyed with the aid of gripping means 3. IR lamps 12 are mounted in the box 1 in given, spaced relationship, and in the illustrated example, in the conveying direction of the sheets 2. The gaps 4 and 5 laterally delimiting the box 1 are each screened by at least brush means 6 extending in the conveying direction 7 of the sheets 2 and comprising respective brush material 8, 9 and 10, 11 for closing off the respective gap and preventing the spread of IR radiation and hot air generated by the IR lamps in the box 1 to different components of the offset press.
According to the preferred embodiment example depicted on the drawing, the laterally delimiting gaps 4 and 5 between the respective side elements are each screened off by brush means 6 extending in the conveying direction. The brush material 8-11 of t
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Burr Edgar S.
IVT Graphics AB
Nguyen Anthony H.
LandOfFree
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