DE2338654A1 - Document shredder with stripper - has sections between cutter discs over part of periphery as annular segments - Google Patents

Abstract

Document shredder has cooperating sets of cutter discs, each coaxially fitted on a shaft, with stationary stripper parts between the individual discs and each projecting only on part of the disc's periphery between the individual discs. The stripper sections projecting between the discs are annular segments and each connected to a fastening section with which they are inset on flexurally stiff, wide crossbars connecting together 2 mounting parts for the shafts. The stripper section is bevelled on one side, at least at the end face facing the cutting region. Shredded material can pass through the gap easily, without danger of blockage.

Description

PATENT ADVOCATE Dipl.-Ing. Rudolf Mobus

741 Reutlingen / WOrtt. Hindenburgttr. 65 - Telephone 347 W

P 1826

Applicant: Mr. Adolf Ehinger Jun. 746 Baiingen

Goethestr. 10

Shredding device, in particular document shredders

The invention relates to a shredding device, in particular a document shredder, with a cutting unit, which consists of cooperating sets of cutting disks, each set of which is coaxial is arranged on a cutting shaft and in which between the individual cutting disks are stationary Stripping parts are arranged.

So far it has been customary to choose between the individual cutting " Disks of the interacting cutting disk sets to arrange one-piece scrapers, the can be pushed onto the cutting disk shaft. These wipers have, among other things, the disadvantage that they extend to the area of the shortest distance

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Arischen extend the cutting shafts of the cutting unit and thereby also the cut material passage area limit and narrow the cutting unit.

The invention is based on the object of the stripping parts for the cutting units of shredding devices of the type mentioned in such a way that these stripping parts reduce the width of the passage area is not unnecessarily narrowed for the material to be shredded and a good passage of the shredded Good is guaranteed by this good without the risk of clogging the device.

The object is achieved according to the invention in that the wiping parts only on one Part of the circumference of the cutter disks protrude between the individual cutter disks and, for this purpose, is expediently like a ring segment formed and each connected to a fastening portion with which they are used in rigid, wide cross members, which two bearing parts for the knife shafts firmly together associate. Advantageously, there are two stripping parts between two sides of each Cutting disc set provided that do not touch, but are separated from each other, the one stripping part is arranged on the inlet side and the other stripping part on the outlet side of the cutting unit and is stored in separate cross members.

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The stripping parts according to the invention therefore do not extend over the entire circumference of the cutting disk shaft but only protrude so far between the individual cutting disks that they fully perform their scraping effect can meet, but do not restrict the free passage space for the material to be cut in the cutting unit. the Abstreifteile can be with their fastening sections, which are appropriately wider than the actual Stripping sections of the stripping parts are formed, Arrange one behind the other in the crossbars, in particular in a suitably shaped receiving groove in the crossbars Slide in from the side. For this purpose, the fastening sections and the associated Äufnahaenut in the crossbars advantageously dovetail-shaped educated.

The rigid, wide cross members have so far replaced the simple support rods for the stripping parts well-known cutting units and, in contrast to these holding bars, form stable connecting elements at the same time between the two bearing parts for the Hesser shaft.

An essential advantage of the comminuting device designed according to the invention is that the stripping sections of the stripping parts at least on their facing towards the cutting area of the cutting mechanism Front side are beveled on one side, so that material to be cut stripes in, as it is through the Cutting discs has been formed upon impact is rotated on the face of the stripping section in its plane. This creates frictional contact

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this strip of material to be cut with the flat sides of the cutting disks largely interrupted because of the inclined strips of food to be cut take up less space in the space between the cutting discs, and makes it easier for the food to be sliced out of the cutting unit. In addition, the cutting unit drive thereby relieved.

Details of the invention emerge from the following description in conjunction with the drawing, on which an embodiment of the invention is shown more or less schematically.

Ib individual show:

Fig. 1 is a schematic section through a

Cutting unit in a perpendicular to the longitudinal axes of the cutting shaft Level;

Fig. 2 is a highly schematic side view

a portion of a cooperating with scraper parts according to the invention, cutting shaft fitted with cutting knives.

The schematic sectional figure 1 shows the upper part of a document shredder 10 with its cutting mechanism, the has two parallel cutting shafts 11 and 12, which in a known manner with in the cutting area interlocking cutter disks 13 are occupied. The material to be cut is fed into the cutting unit by a Input shaft 14 and entered via a feed roller 15.

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Two stripping parts each protrude between the individual cutter disks 13 of the two cutting shafts 11 and 12 16a and 16b, the ring segment-shaped are and each from an 'actual stripping section 161 and a fastening portion 162 exist. As can be seen from Fig. 2, the protrudes narrower stripping section 161 of the stripping parts 16 between the cutter disks 13 »while the fastening section 162 of the stripping parts 16 in the axial direction the cutter shaft is made wider and in a suitably shaped receiving groove 17 of a stable wide cross member 18 is used. The two cross members 18 and 19 for the cutting shaft 11, and 20 and 21 for the cutting shaft 12. are designed in the same way and each connect the one shown and bearing parts located at the ends of the cutting shafts 11 and 12 for the two cutting shafts. The width of the fastening portions 162 is chosen so that the stripping parts 16 as shown in FIG Groove 17 of the cross members 18 to 21 can be lined up in a row, with between the stripping sections 161 of the individual stripping parts 16 there is sufficient space for the individual cutting disks 13.

The inlet-side stripping parts 16a and the outlet egg term stripping parts 16b do not touch each other, and at least the end face 163 of all stripping parts 16 is beveled on one side. However, the one facing away from the cutting area of the cutting mechanism is also expedient rear end face 164 of the stripping parts 16 on one side

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beveled, which means that the strips of material to be cut are stripped off is facilitated in the manner already described above.

As can be seen from Fig. 1, by dividing the scraper of the cutting unit into separate Stripping parts achieved that the passage area between the two cutting shafts 11 and 12 of the cutting unit is not narrowed for the material to be cut. This makes the efficiency of the cutting unit noticeable increased and unwanted pressures of the material to be cut within the cutting unit are avoided.

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Claims (6)

P 1826 - 7 - Claims Shredding device, in particular document shredders, with a cutting unit consisting of interacting sets of cutting disks, each set of which is arranged coaxially on a cutting shaft, and those between Stationary stripping parts are arranged on the individual cutting disks, characterized in that the stripping parts (16) each only on the iron part of the circumference of the cutter disks (13) between the individual knife disks of the cutting unit protrude. 2. Crushing device according to claim 1, characterized in that the between the cutter disks (13) protruding stripping sections (161) of the stripping parts (16) formed like a ring segment and each Bit are connected to a fastening section (162), with which they are rigid, wide cross-members (18-21) are used, which firmly connect two bearing parts for the cutter shafts (11, 12). 3. Crushing device according to claim 1 and 2, characterized in that the stripping section (161) of the stripping parts (16) at least on its facing towards the cutting area of the cutting mechanism Front side (163) is beveled on one side. 509808/0456 P 1826 - 8 - 4. Crushing device according to at least one of claims 1 to 3, characterized in that that between the cutting disks (13) of each cutting disk set two stripping parts (I6a, i6b) with their stripping sections (161) protrude, and that the one stripping part (16a) on the inlet side and the other scraper part (16b) on the outlet side of the cutting unit and each stored in separate cross members (18,19; 20,21) is. 5. Crushing device according to at least one of claims 1 to 4, characterized in that the fastening sections (162) of the stripping parts (16) are formed wider than the stripping sections (161) and are arranged one behind the other in the cross members (18-21). 6. Crushing device according to claim 5, characterized in that the fastening sections (162) dovetail-shaped and in a correspondingly shaped receiving groove (17) are inserted into the cross members (18-21). 509808/0456 -4; Blank page