JP2002528267A - Paper shredder - Google Patents

Abstract

(57) [Summary] A document shredder according to the present invention comprises a pair of cutting rollers (4, 5) which are driven to rotate in opposite directions to each other, and disk cutters (11, 12) in these cutting rollers (4, 5). And a stripping tongue (23, 24) which enters the radial gap (22) between the groove and the bottom of the opposing cutting rollers (4, 5). The stripping tongues (23, 24) are rotatably snap-fitted onto the roller mandrel (10) of the cutting rollers (4, 5) and are thereby rotationally linked by the support on the housing side. Blocked and held.

Description

DETAILED DESCRIPTION OF THE INVENTION

The invention relates to a document shredder according to the preamble of claim 1 (German Patent 3539503).

In this type of document shredder, the stripping tongue attached to each cutting roller is formed by sheet metal cutting parts and completely surrounds the roller mandrel in the gap between the two cutting rollers, ie, Surrounded by a wrap angle of approximately 360 °. This prevents the cutting debris from sticking in the gap. However, the mounting of such a stripper is such that the arcuate side of the stripper which abuts or rests on the roller mandrel in the mounting position is plastically deformed by bending away in the arc direction of its legs and then to the cutting roller axis. After being pushed radially onto the roller mandrel, it can only be returned to its original shape and deformed. This installation is very laborious. Furthermore, the required plastic deformability of the stripper assumes that the material has a small inherent strength, so that the stripper is unstable during continuous operation.

[0003] In the case of the document shredder known from DE-A-197 12 661, the stripper is a single-piece injection-molded plastic part,
It likewise completely surrounds the roller mandrel of the cutting roller in the intermediate space between the disk cutters. Each stripper is provided with a thin, flexible stripping tongue in the region of the radial gap between the outer circumference of the disk cutter of one cutting roller and the roller mandrel of the other cutting roller. The stripping tongue has a small thickness so that the diametrically opposed separating portion of the ring shape of the stripper can be pushed radially axially and then rejoined at the separating portion. Can be opened. In order to maintain the complete encircling of the roller mandrel during the operation of the cutting mechanism, special connecting elements are provided on both sides of the separating part, by which the bendable legs of the stripper are firmly connected or positioned to the housing. Is provided. This requires high installation effort. The thin flexible perimeter of each stripper placed in the radial gap between the disk cutter circumference of one cutting roller and the roller mandrel of the other cutting roller acts like a thin film hinge during installation. The final position of the stripper completely surrounding the roller mandrel is only assured by the connecting element. The connecting element is moored in the housing, and its installation takes a lot of effort. In order to reduce the hassle, it has been proposed to combine the individual strippers arranged side by side into a single block, but the production requires a considerable high molding cost.

It is an object of the invention to improve a document shredder of the type mentioned at the outset in such a way that the stripper can be manufactured inexpensively and without any loss of function and can be easily mounted.

[0005] This problem is solved by the means of claim 1.

The stripper according to the invention differs from the plastic stripper known from DE 197 12 661, in that the cutting rollers are each exclusively dedicated to the cutting rollers, 1991, published by Bauer and Carl Hauser, Munich / Vienna's Handbuch der Verb
indungstechnik) ", ISBN 3-446-14609-1, 294-295.
It is fixed by means of a movable snap connection in the sense of the technical term "snap joint" on the page, this fixing being carried out exclusively by the stripper strikes into the radial gap between the roller mandrel of one cutting roller and the outer circumference of the disk cutter of the other cutting roller. This is performed based on the inherent elasticity of the ripping tongue.

The snap connection of the stripping tongue to the roller mandrel is convenient and simple to implement. Each stripping tongue is adjacent to each other for its attachment.
In the gap between the two disk cutters, it is only necessary to push radially onto the roller mandrel until the stripping tongue snaps into the roller mandrel.

In order to ensure a stripping action on the snap-fitted cutting roller, in addition to the snap joint according to the invention, the stripper simply penetrates into the housing interior chamber from the gap between two adjacent disk cutters. To a certain extent, it is only necessary to prevent each stripping tongue from being pivoted by the cutting roller. The prevention of the interlocking rotation basically does not require holding or fixing. This interlocking rotation prevention is sufficient, for example, only to be caused by the support on the housing side acting in the direction opposite to the rotation direction of the cutting roller. The only important thing is that the interlocking rotation of the stripper by the cutting roller is prevented.

[0009] The holding of the stripper part, which has entered the housing chamber outside the disc cutter, on the housing side, can be achieved by the end of the holding tongue that reaches there being on the housing wall extending parallel to the cutting roller axis, or This is effected in that the holding tongue with the holding hole of the stripper is fitted and held on a holding shaft fixed to the housing, which is individually passed therethrough.

It is effective that each stripper is a flat part stamped from a wear-resistant steel plate having a stable shape and elasticity. This flat part therefore necessarily has a sufficiently large shape strength, especially in the circumferential direction of the cutting roller, and has a large elastic restoring force at the stripping site of small cross-sectional area due to the structure. ing. This very simple production requires one to get into the gap between the two disc cutters.
The use of two or more strippers which are placed side by side instead of one stripper has the advantage that the stripper sheet metal can easily be adapted to the various stripping widths of the cutting mechanism. No additional molding costs are required as in the case of conventional strippers of the appropriate thickness injection molded from plastic.

[0011] The stripping tongues of the stripper are each located at the mounting position on the side of the cutting roller supporting the stripper, facing the other cutting roller.
The stripping tongue has a straight-formed inner edge opposite to the cutting roller to which it is attached, and forms the lateral boundary of the passage pit of the cutting mechanism for the workpiece. The opposing inner edges of the stripping tongues of the strippers on both sides extend substantially parallel to one another or extend slightly in the direction of passage. On the other hand, the outer edge of the stripping tongue is concavely curved in a substantially arc shape. This arc radius corresponds to the radius of the roller mandrel. In this way, each curved outer edge of the stripping tongue rests on the roller mandrel over the entire length of the arc segment formed thereby. Its winding angle is more than 180 °
Preferably it is up to about 215 °. Due to this wrap angle, the stripping tongue has a snap function or a switching element function for generating a clamping connection, and the roller mandrel surrounded by the stripping tongue has its circumferential surface facing the snap connection. I have. This term is referred to above in 1991 by Bauer, Karl Hauser Publishing, Munich / Vienna, "Handbuho del Färbindingstenich (H.
andbuch der Verbindungstechnik) ", ISBN 3-446-14609-1,
It can be understood from the technical term "snap joint" on pages 294-295.

[0012] By forming one of the side edges of the stripping tongue substantially straight and the other curved and concave in the shape of an arc, and by setting the stripping tongue in the mounting position with respect to the respective cutting roller. By positioning, inevitably,
Nearly at the center of the wrap angle of the roller mandrel, there is a narrow cross-sectional area of the stripping tongue. This narrow point facilitates the complete expansion or expansion of the arcuate curve of the stripping tongue during the radial pushing of the stripping tongue into the roller mandrel required for the snap connection. Its wrap angle is preferably about 210 °.

In the following, the invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 is an overall perspective view of a cutting mechanism in which a stripper is placed at a mounting position, FIG. 2 is a cross-sectional view of the cutting mechanism along the line II-II in FIG. 1, and FIG. 3 is cut between stripping tongue pieces. FIG. 4 is a perspective view of two strippers provided with a passage pit for an object and facing a cutting roller of a cutting mechanism. FIG. 4 is a front view of an individual stripper. FIGS. FIG. 3 is a schematic enlarged perspective view of one end of a cutting mechanism that is in operation.

A main part of the function of the document shredder (not shown) is a cutting mechanism 1 shown in FIG.
It is in. The cutting mechanism 1 includes two cutting rollers 4 and 5 that extend in parallel with each other and are rotatably supported by end plates 2 and 3, respectively. The end plates 2, 3 are each rigidly connected to a housing (not shown) of the document shredder. End plates 2, 3
May form a housing partition.

The cutting rollers 4 and 5 are rotationally driven in directions opposite to each other by a rotational driving device (not shown). The opposite rotational directions 6, 7 are indicated by arrows. for that reason,
The passage direction 8 of the object extends vertically downward inside a passage pit (space) 9 formed between the cutting rollers 4 and 5.

The cutting rollers 4 and 5 have a large number of disk cutters 11 and 12 on the outer peripheral surface of the cylindrical roller mandrel 10. These disk cutters 11 and 12 are shown in FIG.
Are arranged concentrically with respect to the roller axes 13, 14 extending perpendicularly to the plane of the drawing. The roller axes 13 and 14 are also the rotation axes of the drive shafts 15 and 16. The plane of rotation of the disk cutters 11, 12 extends at right angles to the roller axes 13, 14. The disk cutters 11 and 12 can be formed integrally with the roller mandrel 10. This means that the cutting rollers 4, 5 are turned from a solid material in a parting-off lathe,
This also applies to the embodiment in which the spiral-shaped tooth gap 17 for cross cutting is milled. However, the disk cutters 11 and 12 can be attached to the roller mandrel 10 later. In any case, each of the cutting rollers 4, 5 supports a number of disc cutters 11, 12 on the outer peripheral surface of the roller mandrel 10. These disk cutters 11 and 12 are arranged side by side in the axial direction of the roller axes 13 and 14 with a space 18 between them. The gap 1
The width of 8 corresponds to the thickness of the disk cutters 11 and 12, and the disk cutter 11 or 12 of one of the cutting rollers 4 or 5 is connected to the other of the cutting rollers 5 or 4.
In the space 18 between the disk cutters 12 or 11 located at the center. That is, the disk cutters 11 and 12 of the two cutting rollers 4 and 5 have entered each other. The axial directions of the roller axes 13 and 14 are indicated by arrows 19 respectively in the perspective views of FIGS. 1, 5 and 6.

The disk cutters 11 and 12 do not protrude into the gap 18 between the other cutting rollers 5 and 4, respectively, up to the cylindrical outer peripheral surface of the roller mandrel 10 located opposite to each other. Rather, the outer peripheral surface 20 of one disk cutter 11 or 12 and the cylindrical outer peripheral surface of the roller mandrel 10 of the other cutting roller 4 or 5 (
That is, a radial gap 22 (see FIG. 2) is formed between the groove bottom 21). Strippers 36 and 37 are stripped into a radial gap 22 between the outer circumference 20 of the disk cutter 11 or 12 of one of the cutting rollers 4 and 5 and the groove bottom 21 of the gap 18 between the other cutting rollers 5 or 4. The tongues 23, 24 protrude from top to bottom in the passing direction 8, i.e., extend substantially vertically in the longitudinal direction.

The stripping tongues 23, 24 facing the groove bottom 21 of the cutting rollers 4, 5 respectively
The outer edges 25, 26 of the roller are approximately centered on the roller axes 13, 14, and have a diameter substantially corresponding to the diameter of the roller mandrel, and are concavely curved in an arc shape. This curved recess is such that the outer edges 25, 26 of the stripping tongues 23, 24 surround the roller mandrel 10 in any case with a winding angle of 180 ° to about 215 ° (about 210 ° in this embodiment). It is formed as follows. By forming in this manner, the stripper 36
, 37 can be movably snap-fitted onto the roller mandrel 10. Here, the stripping tongues 23, 24 are movably fixed directly to the cutting rollers 4, 5 by such a snap joint. The movable snap joint allows the relative rotational movement of the cutting rollers 4,5 within the arcuately curved recesses 47,48 with the stripping tongues 23,24 snap-fit to the roller mandrel 10. I do. This snap joint is an independent integral function unit. This means that there are no separate snap joint parts as functional parts. Snap joints are exclusively used for components originally used for other functional purposes, namely on the one hand to carry out the cutting process (cutting rollers 4, 5) and on the other hand to prevent clogging by cutting debris (stripping tongues 23, 24) is formed by forming it into an appropriate shape. In other words, the functional components for the snap-in action are exclusively components which are integral with the cutting rollers 4, 5 and the strippers 36, 37 or their stripping tongues 23, 24.

The strippers 36, 37 are formed here as sheet metal stamped parts. These are cold rolled and therefore consist of high strength steel sheets. These form a lateral boundary surface of the passing pit 29 with respect to the workpiece whose inner edges 27, 28 facing each other pass unobstructed in the passing direction 8 between the cutting rollers 4, 5.

The tips 30, 31 of the curved outer edges 25, 26 of the stripping tongues 23, 24
It protrudes from the roller mandrel 10 at an acute angle in the radial direction, and acts like a rake face of a parting lathe cutting tool. Has formed. This is particularly valuable when the cutting mechanism rotates in the opposite direction to the rotation directions 6, 7 of the cutting rollers 4, 5. That is, it is valuable when the cutting mechanism is clogged and the blockage is to be removed by reverse rotation of the cutting mechanism. For this reason, the tips 31 of the outer edges 25 and 26 placed on the exit side of the passage pit 29 work effectively when the cutting mechanism rotates in the opposite direction to the rotation directions 6 and 7, and the blade angle 50 is an acute angle. Yes, about 42 °.

The strippers 36, 37 are directed toward the housing in order to avoid being interlocked by the rotation of the cutting rollers, ie, to prevent being interlocked with the driving directions 6, 7 of the cutting rollers 4, 5. Is supported or supported. For this purpose, the strippers 36, 37 have their holding tongues 34, 35 with their tips 38, 39 held on the housing side by holding shafts 32, 33 parallel to the respective cutting rollers 4, 5. As is clear from FIG. 1, both ends of the holding shafts 32, 33 are supported by the end plates 2, 3 of the housing.

The stripping tongues 23, 24, together with the holding tongues 34, 35 integrated therewith, are stripping tongues 36, 3 projecting substantially at right angles from the holding tongues 34, 35.
7 are formed. The strippers 36, 37 attached to the cutting rollers 4, 5 are connected at their free ends 38, 39 by their holding tongues 34, 35 to a common holding shaft 3 fixed to the housing.
2, 33 are arranged side by side. The holding shafts 32, 33 are arranged on the inlet side of the workpiece, that is, above the cutting rollers 4, 5, through which the shafts 13, 14 of the respective cutting rollers 4, 5 extend and which extend in the passing direction 8. It is located in a plane that makes an angle of about 45 ° with the plane. Thus, the space inside the housing (not shown) supporting the end plates 2 and 3 can be reduced.

The attachment of the strippers 36, 37 to the respective cutting rollers 4, 5 and their attachment to the end plates 2, 3 in the form of a compact cutting mechanism takes place as follows.

Strippers 36, 37 attached to both cutting rollers 4, 5 are inserted into gaps 18 between two adjacent disk cutters 11, 12 with their holding holes 41, 42 facing upward. , Are snap-fitted to the respective roller mandrel 10 at curved recesses 47, 48 on the outer edges 25, 26. Thereafter, the holding holes 41, 42 of all stripping square members 36, 37 attached to the cutting rollers 4, 5 are aligned with each other. As a result, each of the holding shafts 32, 33 is connected to the holding holes 4 of all the stripping square members 36, 37 attached to the cutting rollers 4, 5.
1, 42 are passed through. Then, the cutting rollers 4, 5 and the holding shafts 32, 3
3 are fixed at their ends to the end plates 2, 3 to form a complete cutting mechanism. In order to hold the cutting rollers 4, 5 and the holding shafts 32, 33, it is of course possible to use a housing wall integrated with the housing and a housing inner side wall instead of the end plates 2, 3.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a cutting mechanism in which a stripper is located at a mounting position.

FIG. 2 is a cross-sectional view of the cutting mechanism taken along line II-II in FIG.

FIG. 3 is a perspective view of two strippers provided with a passage pit for an object to be cut between stripping tongues and facing a cutting roller of a cutting mechanism.

FIG. 4 is a front view of an individual stripper.

FIG. 5 is a schematic enlarged perspective view of one end of a cutting mechanism in which a stripper is attached to each cutting roller and is located at a mounting position.

FIG. 6 is a schematic enlarged perspective view of one end of a cutting mechanism in which a stripper is attached to each cutting roller and is located at a mounting position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting mechanism 2 End plate 3 End plate 4 Cutting roller 5 Cutting roller 6 Rotation direction arrow 7 Rotation direction arrow 8 Passing direction arrow 9 Passing pit 10 Roller mandrel 11 Disk cutter 12 Disk cutter 13 Roller axis 14 Roller axis 15 Drive axis 16 Drive Shaft 17 Tooth groove 18 Spacing gap 19 Axial arrow 20 Disc cutter outer circumference 21 Groove bottom 22 Radial gap 23 Stripping tongue piece 24 Stripping tongue piece 25 Outer edge of stripping tongue piece 26 Outer edge of stripping tongue piece 27 Stripping Inner edge of tongue piece 28 Inner edge of stripping tongue piece 30 Tip of stripping tongue piece 31 Tip of stripping tongue piece 32 Holding shaft 33 Holding shaft 34 Holding tongue piece 35 Holding tongue piece 36 Stripper 37 Stripper 38 Holding tongue piece Free end 39 of holding tongue Derived end 40 angle 41 holding hole 42 holding hole 47 curved recess 48 curved recess 49 vol with angle 50 wedge angle

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fischer, Peter Germany Day-9450 Kobruk Kantstrasse 16a F-term (reference) 4D065 CA12 CB02 CC01 DD30 EB12 EE19

Claims (9)

[Claims] 1. A pair of cutting rollers (4, 5) extending in parallel with each other and supported in a housing and rotated in opposite directions, and a pair of cutting rollers (4, 5).
), A plurality of disc cutters (11, 12) concentrically positioned with respect to the roller axes (13, 14) and a plurality of stripping tongues (23, 24) each supported by a housing. A disk cutter (11, 12) radially protruding from a substantially cylindrical roller mandrel (10) and arranged side by side with an axial spacing (18) therebetween; Each of the disk cutters (11 or 12) of the cutting rollers (4 or 5) has a radial gap (22) with respect to the roller mandrel (10) of the other cutting roller (5 or 4). The stripping tongues (23) of the strippers (36, 37) enter each other by penetrating into the gaps (18) of the cutting rollers (5 or 4). 24) penetrates into the radial gap between the disc cutters (11, 12) (22), respectively,
Opposing inner edges (27, 28) of the stripping tongues (23, 24)
In the document shredder having a cutting mechanism forming a passage pit (29) for passing the object to be cut without hindrance, the strippers (36, 37) are substantially spaced apart from each other in the roller axis direction. L-shaped separate sheet metal structural parts, the plate-like surfaces of these structural parts having a roller axis (
13, 14), the vertical legs of the L-shaped parts of which are formed as stripping tongues (23, 24) of the radial gap (22) of the clearance (18) from the inlet side of the workpiece. The inside of the L-shaped part is cut by the cutting rollers (4, 5).
Retaining tongues (34, 35) supported on the housing side to prevent interlocking due to
The cutting roller (4, 5) is placed at the entrance side in front of the cutting roller (4, 5), and the side surface of the stripper (36, 37) on the cutting roller (4, 5) side is a roller mandrel (
The roller mandrel (10), which is concavely curved in an arc shape according to the surface shape of (10) and is exposed at the curved recess on the side opposite to the passage pit (9), is moved 180 degrees from the passage pit (9) side. With a wrap angle of more than 0 °, in particular about 210 °, the stripper (36, 37) works together with the roller mandrel (10) of the cutting rollers (4, 5) only by virtue of the inherent elasticity inherent in the stripper. A document shredder characterized in that it surrounds the movable and snap-fit snap joint so as to integrally form the entire functional unit. 2. A document shredder according to claim 1, wherein the strippers are sheet metal stamped parts. 3. The document shredder according to claim 1, wherein the stripper is made of a cold-rolled steel plate. 4. The arcuate outer edge of a stripping tongue (23, 24).
The exposed end faces (30, 31) of the arc-shaped mounting edge (25, 26) and the cutter angle (50, 50) acting like a rake face of a parting lathe cutting tool when the cutting rollers (4, 5) are rotated in reverse. 4. The document shredder according to claim 1, wherein the document shredder comprises: 5. A mounting edge (25, 26) located on the exit side of the passage pit (9).
5.) The cutting edge angle (50) of the tip (31) acting like a parting lathe cutting tool when the cutting mechanism rotates in the reverse direction is an acute angle, in particular about 42 °.
Document shredder described. 6. The method according to claim 1, wherein the stripper is supported by the housing to prevent the stripper from being driven by the rotation of the cutting roller. Paper shredder. 7. The strippers (36, 37) are arranged axially spaced from one another on a holding shaft (32, 33) substantially parallel to the cutting rollers (4, 5). The document shredder according to claim 1, wherein: 8. The retaining tongue of a stripper (36, 37) formed in an L-shape.
8. A document shredder according to claim 7, characterized in that the free ends (38, 39) of the horizontal legs acting as (34, 35) are respectively arranged side by side on the holding shaft (32, 33). 9. A pair of holding shafts (32, 33) extend parallel to the roller axis (13, 14) on the workpiece inlet side of the pair of cutting rollers, and extend approximately 45 degrees from the plane of passage of the workpiece. 9. A document shredder according to claim 1, wherein the document shredder is located in a plane forming an angle of 40 degrees.