Cutting – With means to apply transient nonpropellant fluent material...
Reexamination Certificate
1999-10-21
2001-02-27
Rachuba, M. (Department: 3724)
Cutting
With means to apply transient nonpropellant fluent material...
C083S101000, C083S168000, C083S932000, C451S296000
Reexamination Certificate
active
06192779
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The invention relates to an oiling device in a vertically-operating bread-slicing machine, having a plurality of adjacent cutting belts that circulate endlessly, and crossed, with spacing by predetermined bread thicknesses, around two cutting-belt rollers, and having a horizontal oiling roller that employs an oil-soaked felt jacket to oil the blade surfaces of the cutting belts on both sides of the cutting belts.
2. Prior Art
Generally, known oiling systems for bread-slicing machines employ spray oiling or contact oiling. In spray oiling, the oiling fluid is sprayed onto the cutting belts by means of feed nozzles disposed in the housing of the bread-slicing machine. In this method, the oiling fluid is sprayed in excess to assure a virtually complete wetting of the blade surfaces. The excessive quantity of oiling fluid drips from the top surfaces of the cutting belts, but a portion of the oiling fluid is carried along by the rapidly-circulating cutting belts, so the inside walls of the housing are disadvantageously dirtied by airborne fluid. A further disadvantage of spray oiling is that it requires a large quantity of oiling fluid, and the excessive applied oiling fluid must be disposed of. The method is thus distinguished by a poor cost-effectiveness ratio.
Contact oiling of the cutting belts with the aid of oiling rollers disposed on both sides of the cutting belts is improved over spray oiling with respect to the required quantity of oiling fluid and the attained result. In contact oiling with the aid of oiling rollers, the oiling fluid is introduced into the interior of the oiling roller via oil lines connected to the oiling roller and, due to the centrifugal force in the oiling rollers, which rotate when they come into contact with the cutting belts, the fluid is supplied to the outer felt jacket through holes distributed on the surface. The holes all have the same diameter, and are uniformly spaced from one another. Unfortunately, this leads to excessive soaking of the felt jacket. The oiling rollers are stationary, so the same locations of the felt jacket are always stressed during the oiling process. After a time, the felt jacket no longer possesses its originally-smooth surface; the cutting belts cut tracks into the surface. Therefore, the felt jackets have a short service life and must be replaced at regular, short intervals. Furthermore, the tracks lead to uneven oiling because, during the oiling process, the felt jackets of the two oiling rollers run onto one another at the sections adjacent to the tracks and, due to the pressing pressure of the oiling rollers against one another, the oiling fluid is pressed out and expelled. The circulating cutting belts convey the excess, expelled oiling fluid, thereby dirtying the interior of the bread-slicing machine. This also significantly increases oiling fluid consumption.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore an object of the invention to improve an oiling device of this type, having two oiling rollers encased by felt jackets, such that the felt jackets are uniformly stressed in contact oiling, which significantly extends the service life of the felt jackets.
It is a further object of the invention to disclose an oiling device with which the oiling fluid is uniformly applied to the blade surfaces of the cutting belts circulating in the bread-slicing machine, so the device has a lower oiling fluid consumption.
In accordance with the invention, the first object is accomplished in that at least one of the two oiling rollers can pivot about a horizontal pivoting shaft into a spaced position at a distance from the cutting belts, and, in the spaced position with respect to the cutting belts, the two oiling rollers are displaceable with respect to the cutting belts by a defined segment in the longitudinal direction of the rollers. During bread slicing, the oiling process for the blade surfaces of the cutting belts, which will be described in detail below, is repeated periodically by means of oiling rollers.
In an oiling process, the pivotable oiling roller pivots about the horizontal pivoting shaft from its spaced position with respect to the cutting belts, as its initial position, into an oiling position, where it remains briefly. In the oiling position, the two oiling rollers lie closely against the blade surfaces of the cutting belts respectively facing them, and the blade surfaces are wetted with the oiling fluid in a contact-oiling process, because the contacted cutting belts drive the oiling rollers due to frictional lockup. The pivotable oiling roller is subsequently pivoted back into its spaced position, so the two oiling rollers are spaced from the cutting belts. Now the two oiling rollers are displaced, with respect to the cutting belts, in the longitudinal roller direction into an end position, as the new initial position for the next oiling process, which is axially offset with respect to the original initial position. The two oiling rollers are displaced either in the same direction or in opposite directions. If the oiling rollers are displaced in the same direction, they are preferably coupled to one another, so only one displacement cylinder is required for the displacement.
It is further advantageous if the oiling rollers execute a pendulum movement in the axial direction in consecutive oiling processes, that is, the rollers are alternatingly displaced back and forth between their initial position and the end position. This effects uniform utilization of the felt jackets. No tracks are cut into the felt jackets, which consistently attains reliable wetting of the cutting belts.
In a particularly-preferred embodiment, a horizontally-oriented rectifying shaft is disposed downstream of the pivotable oiling roller on the return side. In the oiling position of the oiling rollers, the rectifying shaft orients the cutting belts flat with respect to the oiling rollers, and the blade surfaces of the cutting belts consequently lie flat on the felt jackets. This also advantageously prevents the blades of the cutting belts from damaging the felt rollers.
In the embodiment of the hollow shaft according to the invention, the number of discharge bores decreases from the center of the shaft to the ends of the shaft, with the discharge bores in the center of the shaft being disposed opposite one another in pairs and only being disposed alternatingly toward the outside, so the distance between two adjacent bores increases from the center to the ends of the shaft. Furthermore, the diameter of the discharge bores of the hollow shaft preferably decreases from the center toward the outside.
The oiling rollers with the hollow shaft and the hollow cylinder are oriented such that the discharge bores lie horizontally, thus attaining a continuous draining of the oiling fluid.
During the oiling process, the oiling fluid is supplied via oil lines connected to the two ends of the hollow shaft, and is uniformly discharged onto the felt jacket via the discharge bores, with only the necessary quantity of oiling fluid being metered, so no excess occurs. Overall, the oil consumption is considerably reduced in comparison to the known oiling method.
With the arrangement of the discharge bores on the hollow shaft and the reduction in the diameter from the center toward the outside, the oiling fluid is purposefully directed into the region on the felt jacket where the most heavily-used cutting belts are disposed.
In addition, a particularly-preferred embodiment of the invention includes an oiling roller whose hollow cylinder has distributer bores, which are uniformly distributed over the cross section of the cylinder and through which the oiling fluid is conveyed outward and transferred to the felt jacket encasing the hollow cylinder, so the jacket is soaked with the oiling fluid. It is particularly beneficial to dispose the distributor bores on helical lines extending on the jacket of the hollow cylinder, with the distributor bores being uniformly spaced from one another or,
Browdy and Neimark
Georg Hartmann Maschinenbau GmbH
Pryor Sean
Rachuba M.
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