DE7502030U - GRINDING MACHINE - Google Patents

Description

Notifier : »· ·« · · Ludv / igshafen / Rh., January 23, 1975

~~ ι :: ": ρ 51215 tt / ai

Paul Ernst. · "Ϊ · ·:::
Maschinenfabrik " ^r V? MbH
6925 Eschelbronn
Kandelstrasse 16

Representative:

Patent attorneys

Dipl.-Ing. Adolf H. Fischer
Dipl.-Ing. Wolf-Dieter Fischer
67 Ludwigshaxen / Rhine
ilBismarckstr. 64

Grinding machine

The invention relates to a grinding machine with a workpiece transport device and a contact element arranged above it, pressing a sandpaper band, wherein the sandpaper band is wound on a supply roll and can be wound on a further roll and has a width corresponding to the workpiece.

In a grinding machine with these features, the sanding paper coming from a supply roll is applied to a sanding pad, the sanding pad executing circular movements for sanding the workpieces and the sanding paper being further wound around the width of the sanding pad after it has become blunt. In this embodiment it is particularly disadvantageous that only low cutting speeds can be achieved, so that this embodiment can only be used with low grinding intensity. Continue-

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however, it is disadvantageous that downtimes when changing paper that have an adverse effect on labor costs.

In three other known embodiments such Sanding machines, the sandpaper is drawn on so-called sanding rollers or it is used in so-called Wide band contact grinding machines an endlessly manufactured grinding belt guided over contact and counter rollers, whereby in both cases the sandpaper has to be replaced with new one after it has worn out.

These known embodiments can with high Cutting speeds work, but this results in longer downtimes for paper changes.

The invention is based on the object of designing a grinding machine of the type mentioned in such a way that, in particular for installation in production lines without downtime, many times over the service life of the sandpaper is achieved, and the machine is working at high cutting speeds can.

This object is achieved according to the invention in that the sandpaper belt alternately from one roll to the other according to the cutting speed required for sanding is driven.

An advantageous embodiment is that when using a grinding roller as a contact element this and / or the rollers are driven that the speed of the drive motors the rolls are controlled at constant paper speed as a function of the roll diameter and that the unwinding roll is slowed down slightly.

Furthermore, it is advantageous that when using a pressure beam as a contact element on both sides of this pulley are provided.

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Finally, according to a further proposal of the invention, the procedure is that the contact element and the rollers a U-shaped height-adjustable frame are arranged, with the rollers at the upper ends of the two parallel Schaakel of the frame are.

The grinding machine according to the invention has the essentials The advantage is that you can avoid downtimes, since a corresponding belt length of the sandpaper can be provided can. It is thereby also achieved that such a machine can be built into a production line, since the machine only has to be shut down at such long intervals that the sanding paper has to be replaced can coordinate with the shutdown of the production line. Another advantage is that it has a high Cutting speed is achievable.

The invention is based on the following description explained in more detail by embodiments shown in the drawing.

Show it,

Figure 1 shows an embodiment of the grinding machine according to the invention in elevation,

Figure 2 is a plan view of Figure 1 and

Figure 3 shows another embodiment for training of the contact element.

On a machine stand 1, two rollers 2 are arranged, around which an endless conveyor belt 3 is placed, which is on supported on a table 4, via a motor 5> and a chain drive 6 is driven.

7502030 02.OZ 78

Opposite the conveyor belt is a grinding roller 9 with a covering 10 as a contact element, the roller being held on a frame 8 with the aid of a bearing 11. In the exemplary embodiment shown, this frame 8 is U-shaped, the bearing 11 being arranged on the horizontal bar of the "U". On the two vertical legs of the frame 8 there is a reel and a further reel 17, which are each driven with the aid of drive motors 12, 15 and the associated chain drives 13 and 16, respectively. The overall height of the frame 8 is adjustable with the aid of two height adjustment devices, ie the distance between the roller 9 and the conveyor belt 3 can be adjusted according to the workpiece thickness. In the exemplary embodiment shown, the sanding belt 18 is wound onto the reel 14 and is guided to the other reel 17 via the sanding roller 9. To press the workpiece 19 onto the conveyor belt 3, pressure rollers are provided on both sides of the roller 9. The grinding roller 9 is driven by a motor 21 via the drive 22.

The operation of the grinding machine is such that the grinding roller 9 is driven by the motor 21, and the grinding belt 18 is carried along by the friction of the covering 10, and this unwinds from the slightly braked winding roller 14, while the winding roller 17 unwinds that of the grinding roller incoming grinding belt 18 spools up. The direction of movement is maintained until the sanding belt 18 of the Roll 14 is unwound, at this moment the direction of rotation of the grinding roller 9 and the winding rollers 14, is changed, so that now the roll 14 spools up while the roll 17 unwinds. A: not shown grinding belt control ensures that the paper is properly wound up, with a special control device it is ensured that the motors 12 and 15 respectively can be regulated in the speed so that the winding speed is always the same, d. H. that the band

3 J 3 S

Q 7

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speed with changing winding diameter Rolls 14 or 17 remains constant.

The grinding belt is designed according to the maximum width of the workpieces 19.

In Figure 3 is another embodiment for training of the contact element shown, there as a contact element a pressure bar 26 is provided, to which pulleys on both sides 24, 25 are arranged, and the sanding belt 23 over the pulleys 24, 25 and the beam 26 runs.

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7502030 010178

Claims (3)

• t *. , • ••• iiii • • • 11 • t • • β ι • • • Ii protection claims 1) Grinding machine for processing wood-like workpieces with or without lacquer coating, with a Workpiece transport device and a contact roller arranged above it that presses on a sandpaper band, wherein the sandpaper tape is wound on a supply roll and can be wound onto another roll and has a width corresponding to the workpiece, characterized in that the grinding j paper tape (18) with constant cutting speed alternating from one roll (14) to the other roll (17) with the help of the contact roller (9, or 24 and 25) is driven and that the unwinding roller (14, 17) interacts with a brake. 2) grinding machine according to claim 1, characterized in that when using a pressure bar (26) as a contact element on both sides of this pulleys (24, 25) are provided. 3) grinding machine according to claim 1 and 2, characterized in that the contact element (9, 26) and the rollers (14 * 17 are arranged on a misshapen, height-adjustable frame (8), the rollers (14, 17) on the upper Ends of the two parallel legs of the frame (8) are located. 7502030 02.02.78