DE8210280U1 - GRINDING ROLLER - Google Patents

Description

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The invention relates to a grinding roller for floor grinding machines with a cylindrical roller core made of solid material, in particular metal, as well as a Elastically yielding plastic or rubber jacket arranged on the circumferential surface of the roller core, to which a film coated with an abrasive, e.g. fabric-reinforced sandpaper, can be applied.

In known grinding rolls of this type, a section of a film web coated with an abrasive is used wrapped around the sanding roller and with its - seen in the circumferential direction of the sanding roller - front and rear edges in a slot arranged approximately transversely to the circumferential direction on the sanding roller special fasteners set. In the event of improper fixing, the coated with abrasive forms Foil on the roller, non-round areas that impair the work result.

In addition, so-called belt grinders are known in which a rotating, closed with abrasive coated film strip runs around two spaced apart rollers, of which the larger is placed on the surface to be processed, so that the abrasive located on the film can take effect. Such devices are characterized by an extremely high quality of work. However the adjustment of the rollers requires a certain skill, so that appropriate devices for inexperienced are less suitable.

It is therefore the object of the invention to create a grinding roller corresponding to the type mentioned above, with which a good work result is achieved, which comes close to that of belt grinders; also should

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the handling can be simplified as possible in order to enable the use also for inexperienced users.

This object is achieved in that with abrasives coated film as a circumferential, radial direction that can be pushed onto the rubber or plastic jacket Flexible sleeve with a slight oversize compared to the outer circumference of the rubber or plastic jacket when standing Roller is formed and the elastically yielding rubber or plastic jacket by centrifugal forces has an enlargeable outer diameter when the roller is rotating.

Because of the invention, need to fix the abrasive coated film on the sanding roller no fastening elements or organs to be actuated. Rather, a simple pushing is sufficient the sleeve-shaped abrasive film over the roller in the axial direction of the same. Due to its elasticity, the rubber or plastic jacket can expand faster Rotation of the roller by expanding in the radial direction firmly against the inside of the abrasive film sleeve, so that no slip occurs between the sleeve and the roller.

. For this purpose, the rubber ^v zw plastic sheath is preferably laminated formed, the opposite of the Umfangsrichf; each have a part of the outer circumferential surface of the rubber or plastic jacket-forming free edge ung a 90 angle deviating forming lamellae and the approximately parallel front and Rear sides of the lamellas are inclined with respect to the outer circumferential surface of the rubber or plastic jacket at an angle other than 90 °.

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The lamellas seek each other under the influence of centrifugal forces, as they arise when the roller rotates, erect, with each lamella at right angles to the circumferential surface of the roller core strives to take. This increases the overall diameter of the roller to the desired extent. Since the Lamellas, seen transversely to the roller axis when the grinding roller is viewed, one of 90 with respect to the circumferential direction Form a different angle, the coated with abrasive film sleeve when erecting the Lamellae taut in a practically ideal circular cylinder shape.

To form the lamellae are in the outer circumferential surface of the rubber or plastic jacket according to a preferred one Embodiment of the invention running essentially transversely to the direction of rotation, in each case up to both Front ends of the rubber or plastic jacket extended, in the view of the grinding wheel transversely to the roll axis, approximately parallel cuts are arranged, which with the Outer circumferential surface of the rubber or plastic jacket has an angle other than 90 and compared to the Axial direction of the grinding roller each a small acute angle that opens in the axial direction of the roller form.

The angle formed by the lamellae or cuts with respect to the axial direction of the roller is im generally less than 10 ° and is preferably about 5 °.

That of the lamellae or cuts with respect to the outer circumferential surface the angle formed by the grinding roller is usually between 30 and 60, preferably at about 50, i.e. the lamellae or cuts form opposite

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a radial ray in the area of the respective cut or the respective lamella an angle of approx. 40.

The manufacture of the laminated rubber or synthetic S?

Fabric jacket and its mounting on the roller core: ΐ be simplified if the sections of the jacket; only up to a f on the roll core * backsheet fastened by set) outside inwards. The thickness of the latter can be, for example, between a sixth to a quarter of the total thickness of the rubber or plastic jacket.

The coupling of rubber or plastic sheath and the Foil sleeve coated with abrasive when operating the sanding roller will be particularly good when the lamellas or cuts with the inner circumferential surface of the rubber or Plastic jacket in the direction of rotation of the sanding roller Include open acute angles. With this arrangement, the effect on the abrasive coated Foil sleeve acting work resistances that on the slats additional seeking to erect the same Forces act.

The seat of the film sleeve coated with abrasive can optionally also be arranged in a helical manner circumferential groove on the outer peripheral surface of the rubber or plastic jacket.

This effect is particularly good when the groove as well as the lamellas or cuts when looking at the sanding roller have a slope in the same direction transversely to the roll axis with respect to the same.

As a rule, the film sleeve coated with abrasive requires a comparatively high effort to be made completely seamless. However, the work result is not affected if the slide

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one to the direction of rotation below one deviating from 90 Has angled connection or seam zone. By wedge-shaped tapering of each other connected, overlapping end regions of the film, the seam or connection zone can be without thickening be carried out so that a coating of the seam zone with abrasives is possible.

The invention is explained below with reference to a preferred exemplary embodiment, which is shown in FIG Drawing is shown. 1 shows a view of the invention Sanding roller at right angles to the roller axis without a film sleeve coated with abrasive,

FIG. 2 shows an axial view of the grinding roller according to FIG

the arrow II in Fig. 1, and

FIG. 3 shows a sectional view of the roller along the section line III-III in FIG. 2.

The grinding roller according to the invention consists essentially from a circular cylindrical roller core 1, one on the outer circumferential surface of the roller core 1 arranged rubber or plastic jacket 2 and a foil sleeve 3 only indicated in Fig. 3, which is coated on its outside with abrasive and, for example, as a fabric-reinforced sandpaper sleeve is designed, which maintains its circumferential dimensions almost unchanged even under load.

The roller core 1 has a hub part 4 with an axial bore 5, which the hub part 4 on a not shown Drive shaft allowed to be pushed on, on which the hub part by interaction of an axial groove 6 with corresponding Projections on the shaft opposite the same is rotatably supported.

The hub part 4 is on a funnel-shaped bottom 7 of the roller core 1 and on spoke-like, with the bottom 7 connected webs 8 connected to a shell part 9, the wall thickness of which increases with increasing Distance from the floor 7 tapers. This casing part 9 forms the cylindrical outer circumference on its outside pool of the roller core 1.

In the rubber or plastic jacket 3, which has a practically closed, circular cylindrical shape when the roller is stationary Has outer circumferential surface 10, cuts 11 are arranged, which extend from the front edge to Extend the front edge of the rubber or plastic jacket 2, so that lamellae 12 are formed. These cuts 11 penetrate the rubber or plastic sheath only up to to one on the shell part 9 by gluing or the like. attached lower layer 13. With regard to the axial direction of the grinding roller, the cuts - when viewed across the roller axis - are each at an angle of 5 °, as can be seen from FIG. 1, in which, for the sake of clarity, only a single section 11 is shown. As shown in FIG. 2, the cuts 11 are opposite radial rays through the radially inner At the end of the cuts 11 go at an angle of approximately inclined, i.e. with respect to the outer peripheral surface of the shell part 9 of the roller core 1, the cuts 11 each form an angle of approximately 50 °. The latter According to a preferred embodiment, the angle is Invention opened in the running direction L of the sanding roller.

On the outer peripheral surface 10 of the rubber or plastic jacket 2, a helical circumferential groove 14 is arranged, which - when viewed from the grinding roller transversely to the roll axis - has the same slope as the cuts 11.

The erf inching sgemä Be grinding roller works in the following way:

The centrifugal forces occurring during rapid rotation of the grinding roller locate the fins 12 under magnification of the outer circumference of the rubber and plastic jacket 2 to erect, so that the fins 12 with: its the Außenumfangsf Pool 10 of the Gumrai- and plastic shell 2 forming the free outer edges firmly from the inside against put on the film sleeve 3 coated on the outside with abrasive and hold it in place with practically no slippage with respect to the roller core 1. Since the lamellae or the cuts 11 according to FIG. 1 form an acute angle to the axial direction of the grinding roller, the film sleeve 3 coated with abrasive is stretched in a practically ideal circular cylinder shape. The contact pressure of the lamellas 12 on the inside of the abrasive-coated film sleeve 3 is increased when resistances opposed to the direction L of the grinding roller act on the film sleeve 3, since these resistances exert an erecting force on the lamellas. The helical groove 14 improves the stability of the film sleeve 3 with respect to displacements in the axial direction of the grinding roller.

If the film sleeve coated with abrasive is not seamless, the connection or Seam zone opposite the circumferential direction of the grinding roller at an angle other than 90, i.e. at a small acute angle with respect to the axial direction the sanding roller. The seam or connection zone preferably has a slope of the cuts 11 with respect to it the incline opposite to the roller axis. For example, the course of the connection or Seam zone of the dashed line 15 in FIG. 1.

Claims (10)

Expectations Sanding roller for floor grinders or the like. with a cylindrical roller core made of solid material, in particular metal, and one on the circumferential surface of the roller core arranged, elastically yielding plastic or rubber jacket, to which an abrasive-coated film, e.g. fabric-reinforced sandpaper, can be applied is characterized. that the abrasive coated film than on the Rubber or plastic jacket (2) that can be pushed on, circumferential film sleeve that is flexible in the radial direction (3) with a slight oversize compared to the outer circumference of the rubber or plastic jacket (2) standing roller is formed and the elastic GRAMKOW · ROTERMUND SEELBERCSTR. as / ao. 7000 Stuttgart so TELEPHONE 107 II) 66 79 61 MANlTZ · FINSTERWALD ■ HEYN ■ MORGAN ROBERT-KOCH-STRASSEI. 8000 MONKS 39 TELEPHONE 10 89) 93 4911. TELEX 05-39 673 PATMF yielding rubber or plastic jacket (2) has an outer diameter that can be enlarged by centrifugal forces when the grinding roller is rotating.
5 2. Sanding roller according to claim 1, characterized in that that the rubber or plastic jacket (2) is laminated, the opposite to the circumferential direction an angle deviating from 90 ° forming lamellae (12) each a part of the Outer peripheral surface (10) of the rubber or plastic jacket (2) have forming free edge and the approximately parallel front and back sides of the lamellae (12) with respect to the outer circumferential surface (10) of the rubber bsw. Plastic jacket (2) under are inclined at an angle other than 90 °. 3. Sanding roller according to claim 2, characterized in that that to form the lamellae (12) in the outer peripheral surface (10) of the rubber or plastic jacket (2) to the circumferential direction of the grinding roller essentially transverse, each extending to both ends of the rubber or plastic jacket (2), when looking at the sanding roller at right angles to the roller axis parallel cuts (11) are arranged, which with the outer peripheral surface (10) deviates from 90 ° Angle and opposite to the axial direction of the sanding roller a small pointed one in the axial direction of the roller Form an opening angle. 4. Sanding roller according to one of claims 2 and 3, characterized characterized in that the angle of the lamellas (12) or cuts (11) with respect to the axial direction of the grinding roller is less than 10 and is preferably about 5 °. 5. Sanding roller according to one of claims 2 to 4, characterized in that the lamellae (12) or cuts (11) with respect to the outer circumferential surface (10) of the rubber or plastic jacket (2) with the upright The angle formed by the grinding roller is between 30 and 60 and preferably about 50. 6. Sanding roller according to claim 5, characterized in that that the lamellas (12) or cuts (11} with the outer peripheral surface of the roller core (1) in the running direction (L) Include acute angles that are open on the sanding drum. 7. Sanding roller according to one of claims 2 to 6, da- characterized in that the cuts (11) the Gummibzw. Plastic jacket (2) from the outside to the inside only up to a lower layer attached to the roller core (1) (13) enforce. 8. Sanding roller according to one of claims 1 to 7- characterized in that on the outer peripheral surface (10) of the rubber or plastic jacket (2) a helically encircling groove (14) is arranged. 9. Sanding roller according to one of claims 1 to 8, characterized in that the outside with abrasive coated film sleeve (3) one to the direction of rotation has connecting or seam zone running at an angle deviating from 90 °. 10. Sanding roller according to claim 9, characterized in that the connection or seam zone (15) with respect to the Roller axis of the grinding roller has the opposite slope as the lamellae (12) or cuts (11).