US 1868825 A
Description (OCR text may contain errors)
July 26, 1932. A, GROSJEAN 1,868,825
CONVEYER ROLL Filed Aug. l1, 1950 fnventwz b gM/f ro/'en n Mya/b] PX/awa ft. tys.
Patented `l'uly 26, 1932 UNITED STATES ANDR GnosJEAN, or RUEIL, FRANCE CONVEYEB BOLL Application led August 11, 1930, Serial No. 474,643, and in France September 14, 1929.
Trains of conveyer rolls as a means of transport are already known and are much utilized particularly in rolling-mills or 1n combination with rolling-mill trains. These 5 trains of conveyer rolls are usually driven by means of an electric motor actuating a transmission shaft which, in turn, operates each conveyer roll of the train through bevel gearing. In order to suppress the important loss of power these transmissions give rise to each conveyer has, of late, been tted with a motor driving it individually. In general roller-conveyers have to ensure very heavy duty: in addition they suier very severe shocks -while there is appreciable heating of each conveyer roll. These shocks as well as the heat have a detrimental action on the individual motor fitted on the extension of the shaft of each conveyer roll. The above mentioned shocks or overloads on the conveyer roll frequently give rise to a deection which has its repercussion on the motor the air gap of which becomes insuiiciently large to prevent the rotor rubbing against the stator. The same thing occurs when (as must unavoidably be the case when equipment is subjected to intensive duty and exposed to high temperatures), the two journals of the con-A veyer roll `become worn, theaxis of the cona()V veyer roll thus becoming displaced in relation to the axis of the motor. A In order tov avoid the motor being rendered useless owing to the deformation of the conveyer roll and the shocks it receives, any
elastic coupling has been inserted between the conveyer roll and its motor. There is one great drawback to this arrangement in that it necessitates considerable space in the width of the train which, in'the majority of cases, is not available in rolling mills. Instead of coupling each conveyer roll direct to its motor (with 'or without a special coupling) independent motors have also been used and friction or gea'r driving devices itted between the conveyer rolls and the motors. vIn this disposition the undesirable inuence of shocks to and wear of the intermediary gears, and consequently. on themotors is again unavoidable; in addition the 5a arrangement with an external motor necessitates a very wide space. On the other hand the intermediary gears constitute an undesirable complication while the drawbacks of the bevel-geared conveyer roll trains are not overcome to any great extent by their use.
The object of the present invention is a device which obviates the disadvantages and the defects enumerated above, this device being characterized by the fact that an inverted motor is utilized, the central part of whichl is stationary, while the outside part Ais rotatory (an arrangement which is frequently utilized in wood planing machines). The fact that this motor is positioned inside a conveyer roll supported by its two outside journals which rest on the conveyer train frame leads to a considerable economy in space, as compared with all other known methods of erection; on the other hand as the motor, positioned inside the conveyer roll, is connected to the casing of the said conveyer` roll only in an elastic manner in order to rotate the said casing, the shocks which the casing may'receive can neither have any influence on the motor nor alter its air gap. In the same manner wear of the bearings or of the outside journals of the conveyer rolls cannot cause any of the component parts of the electric-motor (those parts moving in relation one to the other) to come into contact. The stationary shaft of the internal motor can be borne either by brackets fitted on the frame or on the bearings, or by separate bearings positioned in the hollow journals of the conveyer roll.
In the attached drawing two forms o realization of the device forming the object of this invention have been shown diagrammatically and merely as examples:
Figure 1 shows a conveyer roll for a rollei` conveyer train, the said conveyer roller comprising an internal electric motor, the rotor of which is connected to the conveyer roll only by an elastic coupling which causes rotation of the conveyer roll, the stationary shaft of the electric motor being held from vthe outside without any contactwith the conveyer roll;
Figure 2 shows the same conveyer roll in which the stationary shaft of the motor is anni centered in the journals of the said conveyer roll, the fixing ot this shaft from the outside being provided solely to prevent it rotating.
As will be seen in the drawing, the device comprises a conveyer roll l comprising two hollow journals 2 carried by the bracket bearings 3. ln the center is the stationary shaft l bearing the stator 5 of the electric motor. rlhe rotor 6 is supported by bearings 7 and is connected by means or .coupling gears 8, to the conveyer roll. l indicates the brackets bearing the electric motor and preventing its shaft from rotating and l2 indicates the frame of the roller conveyer train.
ln Figure S2 the weight of the motor is supported by sleeves or bushes 9 carrying shaft l of the motor and positioned in the hollow journals 2 of the conveyer roll l. Brackets 1l, in this ease, are provided only to prevent rotation of the shattd ot the motor.
Current is supplied to the motor in a well known manner through a hollow provided in shaft a'. Figures l and 2 show clearly that neither llection oit the conveyer roller nor wear of its journals can modify the accurate mounting of the motor or atleet its operation. in examination of Figure l shows that the motor is mounted absolutely independently; as shown in Figure 2, the shaft of the electric motor may be displaced through wear of the bearings and journals and yet remain invariably in the axis of the rotor. lt is not necessary to take into account the wear ot the bearings oit the electric motor since these only support the actual weight of the motor which, as experience proves, does not cause any appreciable wear j, oiC the'bearings in question.
lt is evident that any direct or alternating current motor may be used as a driving niotor.
Summary motor being supported either by the hollow journals of the conveyer` roll, or within the i roller itself or again from the outside ot the conveyer roll by suitable brackets.
What l claim is l. fla conveyer assembly comprising a pair of journals, a conveyer roll rotatably supported in said journals, a rotor positioned Lacanau inside of, and in spaced relation to, said eon veyer roll, said roll and rotor being connected in driving and driven relation, a stator positioned inside said rotor and traversing said journals, said stator and rotor forming an electric motor adapted to drive said roll, and means for preventing rotation of said stator.
2. A conveyer assembly comprising in combination a pair of journals, a stator travers-Y ing said journals, means for preventing rotation of said stator, a rotor rotatably supported on said stator, said rotor and stator forming an electric motor, and a conveyer roll positioned outside of said rotor and rotatably supported on said journals, said rotor and roll being connected in driving or driven relation whereby the latter may be driven by the former.
A conveyer assembly comprising a pair of ali ffned hollow journals, a conveyer roll rotatably supported on said journal, a hollow rotor positioned inside ot, and in spaced relation to, said conveyer roll, means flexibly connecting said conveyer roll and rotor, and a stator positioned in said hollow rotor, said stator bein(r lined against rotation, said stator and rotor rorming an electric motor.
el. A conveyer assembly comprising a pair ot hollow journals, a stator traversing said journals, means for preventing rotation of said stator, a conveyer roll rotatably mounted in said journals in spaced relation to said stator, a rotor rotatably supported on said stator, and means iexibly connecting said rotor and roll in driving and driven relation.
5. A convey-er assembiy comprising a pair of hired, aligned, hollow journals,` a stator' traversing said journals and fixed against rotation, said stator including a shaft, a rotor rotatably supported on said shaft and in spaced relation to said stator, said rotor and stator constituting an electric motor, a cylindrical conveyer roll rotatably supported in said journals and in spaced relation to said rotor and stator, and means ilexibly connecting said rotor and roll in driving and driven relation.
ln testimony whereof l have signed this specification.