Brushing – scrubbing – and general cleaning – Machines – Brushing
Patent
1990-02-16
1991-11-05
Sewell, Paul T.
Brushing, scrubbing, and general cleaning
Machines
Brushing
15 491, A47L 1500
Patent
active
050621777
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a brush head for deburring and brushing machines with a base plate attached to the working shaft of the machine so it turns with it, and several fingerlike brushes are held replaceably in the base plate parallel to the axis of rotation and with a guide plate mounted parallel to the base plate so it is adjustable relative to the latter in axial direction and the brushes pass through the guide plate.
Such a brush head operated at high speeds of, for example, 1500 rpm is known from German Utility Patent 7,807,217. With this brush head, the fingerlike brushes which may consist, for example, of wire bristles, abrasive nylon or other materials are held so they are axially parallel with a working shaft of the machine on a base plate mounted on the shaft. These brushes project through a guide plate. The two plates are adjustable relative to each other in the axial direction of the working shaft. The guide plate prevents the individual bristles, etc. from escaping during the rotation of the brush head, which rotates at a high speed. The free brush length can be varied by moving the base plate, e.g., when a "soft brushing effect" is desired. Especially in operation of such a brush head with a relatively large free brush length and a high rotational speed, the bristles on the trailing end of the working direction can bulge out because the rear bristles on the trailing end are no longer supported by bristles behind them. This results in different machining angles between the front and rear bristles. This difference in machining angle, which occurs during prolonged use of the brush head--depending on the bristle material, the free bristle length and the pressure applied--results in different machining qualities.
East German Patent 145,453 describes a brush head for a deburring or brushing machine whereby several brushes like paintbrushes mounted so they can rotate on a base body of a gear casing are each driven individually at a high rotational speed. The base body of the gear casing executes a slow rotational motion while the brushes are driven at a high speed. Such a brush head should be used preferably for deburring recessed workpiece contours. Since the brushes that are designed like paintbrushes are not supported at the sides, the individual bristles spread apart greatly due to the centrifugal forces that occur, so the tips of the bristles strike the surface to be deburred only to a limited extent. A brush head of this type is, therefore, unsuitable for deburring large areas and edges. The deburring results must necessarily be uneven and inadequate.
The purpose of this invention is to propose a brush head of the type defined initially, whereby the brushes rotate about a central axis at a high peripheral velocity and whereby the fingerlike brushes wear uniformly over their end faces in order to keep the machining quality of such a brush head constant over the entire useful length of the individual brushes.
The problem on which this invention is based is solved by a brush head of the type described initially, characterized in that the brushes are mounted so they can rotate in the base plate and they are driven with a speed whose maximum ratio relative to the speed of the brush head is about 1:50. The additional rotational motion of the brushes according to this invention is not a cutting motion. The actual cutting velocity is achieved by the rotational motion of the brush head. Due to the additional superimposed rotation of the brushes rotating at a very low rotational speed, e.g., 1-2 rpm, about their own axis it is possible to assure that the individual bristles of the fingerlike brushes will wear uniformly during operation of the brush head because the bristles of a brush assume different positions during operation relative to the workpiece being treated. There is no bowing of the bristles. The machining angle remains constant within the brush. Uniform wear of the brushes assures uniform deburring or brush treatment with a uniform surface quality accordingly. In addition, the lifetime of t
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Cicconi BethAnne C.
RSA Entgrat-Technik Rainer Schmidt
Sewell Paul T.
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