Press roll unit for reel-up of paper cutter

Details Press roll unit for reel-up of paper cutter Press roll unit for reel-up of paper cutter

1999-06-30

2001-01-30

Walsh, Donald P. (Department: 3653)

Winding, tensioning, or guiding

Convolute winding of material

Pressure element against coil

C242S541400, C198S832000, C198S835000

Reexamination Certificate

active

06179242

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a press roll unit for a reel-up of a paper cutter, the press roll unit comprising two adjacent rolls around which there runs a belt arrangement operatively interconnecting the rolls, an electric motor driving the roll unit being arranged inside at least one roll.
DESCRIPTION OF THE BACKGROUND ART
Electric motors are usually cooled by blowing air through conduits inside or on the surface of the motor by means of a blower that is mounted on the shaft of the electric motor or is driven by a separate motor. It is essential that the rate of the air current passing the surface to be cooled is rendered sufficiently high.
Where a press roll unit is concerned, the electric motor driving the unit is an external rotor motor which is mounted inside a press roll and which cannot be cooled normally. The belt arrangement covering the rolls is usually made of rubber, and so heat does not transfer sufficiently, since the rubber belt has poor heat conductivity as compared with steel, which the rolls are made from.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above drawback, i.e. to effect sufficient cooling of the motor itself and the surface of the roll located at the motor. The object is achieved with a press roll unit which is characterized in that at least one aperture is formed in the belt arrangement so as to cool the electric motor and the roll surrounding it.
The invention is based on the idea that the surface of a rotating roll is brought into direct contact with the surrounding air, which ensures efficient transfer of heat from the roll to the air.
The most preferable solution is probably one in which the belt arrangement comprises at least two belts spaced at a predefined distance from each other to form the above-mentioned at least one cooling aperture.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.


REFERENCES:
patent: 2360275 (1944-10-01), Rau
patent: 3698658 (1972-10-01), Skei
patent: 3791602 (1974-02-01), Isakson
patent: 3957220 (1976-05-01), Beck et al.
patent: 4508279 (1985-04-01), Tokuno et al.
patent: 4518300 (1985-05-01), Kent
patent: 4723724 (1988-02-01), Bradley
patent: 0274229 (1988-07-01), None

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