DE29610886U1 - Chopper - Google Patents

Description

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Applicant: AL-KO Kober AG Ichenhauser Str. 89359 Kötz

Representatives : Patent Attorneys

Dipl.-Ing. H.-D. Ernicke

Dipl.-Ing. Klaus Ernicke

Schwibbogenplatz 2b D-86153 Augsburg

Date: File:

20.06.1996 330-611

OJ DE-G 296 10 886.3

Note: AL-KO Kober AG File: 330-611 dated 31.07.1997 5

DESCRIPTION Shredder

The invention relates to a shredder for garden waste or the like with the features in the preamble of the main claim.

Such a shredder is known from DE-A-43 44 738.

It has a rotating milling roller that works together with a parallel rotating counter roller. The two rollers are arranged without any gaps and touch each other on the surface, with the milling teeth sliding along the casing of the counter roller.

In addition, a support body is arranged in the gap between the rollers, which guides the shredded material to the rollers and ensures self-feeding. The shredded material is pressed against the support body, which creates frictional forces that oppose the feed. Accordingly, the previously known shredder requires a relatively high engine power. In addition, there is considerable wear. The previously known shredder requires constant maintenance and adjustment of the roller spacing as well as adjustment of the support body.

DE-A-44 44 977 shows another chipper with two milling drums, the milling teeth of which are laterally offset from one another and arranged with a gap. This arrangement has the same disadvantages as the above-mentioned prior art. ~ ·■

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Another chipper of this type is known from US-A-3 979 075. Here, two milling rollers or one milling roller and a rotating counter body work together, whereby there is at most a sliding contact between these parts. However, there is usually even a gap. Here, too, the disadvantages mentioned above arise.

DE-U-93 19 071 shows a cutting unit for garden shredders with two milling rollers whose teeth mesh with one another. The cutting edges slide along the back of the counter teeth. On the lower outlet side gusset there is a counter body with a triangular cross-section, on which the shredded material is to be additionally shredded. This milling arrangement requires a particularly precise setting and adjustment of the roller axes, which also has to be constantly readjusted. The self-feed is problematic with this arrangement.

DE-A 43 26 093 discloses another shredder. It consists of a single cutter blade that is moved along a drop-shaped curve via a suitable crank drive and is intended to press the shredded material against a rotating counter roller and thereby separate it by peeling it. This arrangement does not allow the shredded material to be fed in automatically. A high motor power is also required. The cutting action lasts for a maximum of 25% of the blade movement. The remaining 75% is idle. This arrangement also tends to vibrate and generate a lot of noise. It is also particularly susceptible to wear and tear and requires a lot of maintenance.

Other shredders are known in practice in various designs. The cutting tool consists of a rotating plate with one or more raised knives. Such knife shredders require

high drive power, rotate at high speed and cause noise. Accident safety is also problematic.

It is therefore the object of the present invention to show a better shredder. The invention solves this problem with the features in the main claim.

In the shredder according to the invention, the cutting tool is designed as a slowly rotating milling roller. Such a cutting tool requires little drive energy, runs relatively slowly, causes little noise and has a high level of operational and accident safety. The shredded material is drawn in slowly and continuously. It does not shake or bang. The milling roller shredder is a quiet shredder.

The milling drum works together with a moving counter body, which is preferably designed as a freely rotating drum. The rotating counter body is rotated by cutting/tooth engagement with the milling drum. The two parts form a squeezing gap or gusset with walls moving on both sides, into which the shredded material is drawn safely and with little friction. The low-friction guide is one of the reasons for the low power and energy consumption of the shredder.

This design allows the drive power to be reduced even further compared to previously known milling drum chippers or the maximum branch diameter to be chipped to be increased significantly. The application area therefore extends to power ranges in which three-phase machines are required for conventional chippers.

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The penetration depth of the milling teeth in the counter body is preferably in the viscoelastic range of the roller material. This ensures that the chopped material is cut through safely and reduces wear and tear. The milling roller and the counter body can be mounted with their axes in a fixed position and do not require any special feed and adjustment mechanisms. The cutting tool according to the invention is therefore also particularly low-maintenance, reliable and economical.

In the milling drum shredder according to the invention, it is advantageous to install a chicane in the discharge shaft as an accident protection. It prevents access from the shaft opening to the cutting tool. In order to improve the discharge behavior, an air flow can be directed at the chicane, for which the cooling air flow of the engine is advantageously used. The air flow blows the chopped shredded material along the chicane through the discharge shaft. Due to the slow rotation speed of the milling drum, this shredded material has relatively little kinetic energy and is carried along by the air flow, avoiding local deposits and accumulations.

Further advantageous embodiments of the invention are specified in the subclaims.

(continue with page 4 of the originally submitted application)

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LIST OF REFERENCE SYMBOLS

1 Shredder 2 Housing 3 Cutting tool 4 Milling drum 5 Milling cutter axis &bgr; tooth, cutter tooth 7 Envelope circle 8th Counter body, roller 9 axis 10 gore 11 Cutting housing 12 Feed direction, ejection direction 13 Direction of rotation 14 Drive, engine 15 Fan 16 transmission 17 Bulkhead 18 Inlet opening 19 Outlet opening 20 Airflow 21 chicane 22 Deflector 23 Deflector 24 Ejection chute 25 Input opening, funnel 26 Feed pipe 27 Handle 28 ' frame

Claims (5)

ANl DE-G 296 10 886.3 Note: AL-KO Kober AG File: 330-611 of 31.07.1997 5 NEW PROTECTION CLAIMS 1.) Shredder for garden waste or the like with at least one rotating milling roller which interacts with a movable counter-body, characterized in that the milling roller (4) engages with its teeth (6) in the surface of the counter-body (8). 2.) Chopper according to claim 1, characterized in that the milling roller (4) with its teeth (6) engages tangentially in the surface of the counter body (8) and carries the counter body (8) along at least intermittently. 3.) Chopper according to claim 1 or 2, characterized in that the counter body (8) is designed as a freely rotatable rotating body, in particular as a roller. 4.) Chipper according to claim 1, 2 or 3, characterized in that the milling roller (4) and the counter body (8) are arranged next to one another with parallel axes (5, 9), the milling teeth (6) being arranged on the roller circumference and engaging in the casing of the counter body (8). 5.) Shredder according to claim 1 or one of the following, characterized in that the counter body (8) consists of plastic.