Drive of a felt guide roll

Details Drive of a felt guide roll Drive of a felt guide roll

1988-10-05

1990-03-20

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34123, 34116, F26B 1102

Patent

active

049089587

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a drive of a felt guide roll in a drier group of a paper machine.
In a drier group a higher web tension frequently is present at its end than in the preceding paper sections where the web of paper is even wetter. A felt or wire (which will both be referred to herein generically as a "felt"), in addition, generally wraps around the paper guide rolls of the drier group together with the web of paper in order to dry and guide the latter. In order for this guide function to remain assured and for the felt not to brake the web of paper and eliminate the adherence to the paper guide rolls, it is necessary to assure speeds of felt and paper web which are as identical as possible.


SUMMARY OF THE INVENTION

It is therefore advisable to drive the felt or wire, in particular, by a felt or wire guide roll. It is possible here to provide separate electric motors for such a drive. However, this is very expensive and it is difficult to assure precise synchronism of felt and paper web.
This objective is achieved in accordance with the invention by a drive for a guide roll of a felt or wire used in the drying group of a paper machine, or the like. To drive the web, a gear transmission drives a selected one of the paper web guide rolls, which may be a drying cylinder, in a first group of drying rolls. The felt or wire is wrapped around a second group of rolls comprising felt or wire guide rolls. The arrangement may be such that the felt or wire is above the array of drying rolls.
One selected guide roll of the second group, which is the driven roll, is connected with the shaft of a drive gear of the gear transmission via a belt drive transmission. Preferably, the felt or wire guide roll that is connected with the belt transmission is one of the felt or wire guide rolls that is near to the driving gear of the gear transmission, and it preferably is the closest one to that gear. Rotation of the drive gear causes the gear transmission itself to drive the selected one roll of the first group; while via the belt transmission it drives the driven guide roll of the second group.
The drive gear of the gear transmission includes a drive pinion which is on a shaft to which the drive pulley of the belt transmission is attached.
The driven felt or wire guide roll supports the felt. At the end of that driven guide roll is a shaft that carries a driven belt pulley. The belt pulley on the driven shaft is disposed between the end of the driven felt or wire guide roll and a bearing in which that shaft of the driven guide roll is supported.
It has been found that excellent synchronism can be obtained with this solution even when the web is accelerated.


BRIEF DESCRIPTION OF THE DRAWINGS

One embodiment of the invention is shown in the drawings, in which:
FIG. 1 is a simplified diagram showing the guidance of the web and felt, and
FIG. 2 is a top view, partly in section, of the region where the gears, the driven paper guide roll, and the driven felt guide roll are located.


DESCRIPTION OF A PREFERRED EMBODIMENT

FIG. 1 shows diagrammatically an end view of the drier group. The paper web, indicated by dash-double-dot lines, is guided around the web guide rolls 1, 21, 22 and 41. The guide roll 1 is driven by gears 9, 10 and 11 --shown schematically by circles in dash-dot lines --of a transmission gearing 6. The felt guide rolls are designated 2, 31, 32, 33 and 34. The felt is indicated in dash-dot lines. The felt guide roll 2 for the upper course of the felt, which roll is closest to the gearing 6 or to the paper guide roll 1 driven by the gearing, which paper guide roll 1 may also be a drying roll, is driven via belt pulleys 13 and 14 and belt 15 by the shaft 12 of the drive pinion 9 of the transmission gearing 6, as can be noted in further detail from FIG. 2.
Of course, a felt guide roll for a lower course of felt (not shown) and driven by the shaft of another gear wheel also could be considered for the drive.
In FIG. 2 the belt pulley 14 of the felt guide roll 2 is shown as be

REFERENCES:
patent: 4181039 (1980-01-01), Phelps
patent: 4495712 (1985-01-01), Justus

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