Textiles: ironing or smoothing – Smoothing machines – Roller presser
Patent
1994-07-25
1996-03-19
Crowder, C. D.
Textiles: ironing or smoothing
Smoothing machines
Roller presser
38 60, D06F 6300
Patent
active
054994640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a laundry mangle comprising at least one mangle roller, which is held by means of at least one supporting arm in a heatable trough, in a service position, in which the mangle roller and the trough assume by means of at least one adjusting means a moveable position relative to each other that defines an inlet and outlet side for the passage of laundry articles.
A laundry mangle is known from the PCT/WO 85/03313, where there are several mangle rollers arranged successively in series. Due to the adjustability of the respective mangle roller to the assigned trough, an approximately parallel, preferably coaxial positioning of the longitudinal axes of the roller and semi-rotary cylinder can be obtained, a feature that should guarantee a frictionless operation of the mangle. Furthermore, it is possible to swing the mangle roller completely into or out of the trough, in order to have unimpeded access to the trough, for example, for the purpose of removing the laundry articles that have become caught, cleaning and/or ventilation.
To this end, the ends of the bearing axle of the respective mangle roller can be rotated in a pair of supporting arms, which can be swung up and down by means of a working cylinder around a stationary bearing point. The bearing, which can be adjusted within a narrow range, in the form of a bearing point, in order to guarantee frictionless operation, is then set in such a manner that a coaxial service position between mangle roller and assigned trough is achieved as far as possible; a position that is then fixed in tire effective service position.
The friction generated in this service position that is set once, between the mangle roller and the surface of the trough and that should have as low a value as possible does not remain, however, uniform and constant during service. First, due to its torque the driven mangle roller has the tendency to move in the direction of the trough on the inlet side of the mangle, a state that reduces on the inlet side the distance between mangle roller and trough, thus resulting in raised frictional values at this point. Secondly, the friction on the trough surface changes in an irregular and unpredictable manner, for example due to nonuniform heating or during the introduction of laundry articles, which, of course, exhibit different sizes, thickness and also frictional values and, being dragged along by the roller surface so as to cause friction, are moved along the trough surface.
This frictional force thus generated leads especially in the inlet sided region of the mangle to a nonuniform and raised ironing pressure. At the same time the mangle performance drops, since the ironing pressure on the laundry outlet side of the mangle drops due to the corresponding increase in distance from the trough, thus not resulting in the thermal transfer required there, whereas in the inlet sided region said ironing pressure increases only insignificantly as the pressure increases. The high pressure on the inlet side results in an undesired high wear not only on the laundry articles but also on the roller lining applied on the surface of the mangle roller.
A mangle of the aforementioned class is known from the DD-PS 24 331, where the mangle roller and the trough assume by means of the adjusting means a moveable position relative to each other while the mangle is operating. On both sides the mangle roller is mounted on a supporting arm, by means of which it can be swung out; and simultaneously a drive wheel for the mangle roller is mounted on the swivel pin. Mangle roller and drive wheel are connected together by means of the meshing of a gear wheel. To eliminate the resulting tooth pressure, which leads to a nonuniform ironing or pressing pressure within the trough, the known rotary mangle provides that between the gearwheel of the roller axle that exhibits the same or approximately the same diameter, and the actual drive wheel on the supporting arm there is an intermediate wheel, which can also be swung out. Furtherm
REFERENCES:
patent: 2657483 (1953-11-01), Zwaard
Bowe-Passat Reinigungs Und
Crowder C. D.
Izaguirre Ismael
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