Solid material comminution or disintegration – Apparatus – With automatic control
Reexamination Certificate
1998-12-18
2001-04-10
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
With automatic control
C241S100000, C241S236000
Reexamination Certificate
active
06213417
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for the delayed disconnection or switching-off of the drive of cutting mechanisms of paper shredders, wherein the switching-on process of the cutting mechanisms is automatically triggered predominantly by the insertion of the materials to be shredded into the feed shaft.
2. Description of the Related Art
In cutting mechanisms of paper shredders, the delayed disconnection of the drive has the purpose of ensuring that the drive always stops only after the cutting mechanism has been cleared or cleaned, i.e., the paper particles, dust resulting from cutting, etc., have left the cutting mechanism, and primarily of ensuring that the respective document has been completely destroyed or shredded.
In order to achieve this, electronically acting components have already become known in actual practice which are provided for the drive control. However, these components have the specific disadvantage that they are relatively expensive.
Also known in the art are pneumatic devices which operate with an air cylinder and delay valve. In addition to the disadvantage of a hard switching-on process, this type of construction also has the specific disadvantage that it is relatively expensive and that the many fine mechanical structural elements are susceptible to trouble. In addition, the electronic and pneumatic delay elements which have thus far become known in the art have the principal disadvantage that the duration of the after-running time of the cutting mechanism must be preadjusted empirically; however, since it is generally known that depending on the type of paper, the “self-cleaning” time of the cutting mechanisms varies widely and takes particularly long in the case of very thin paper, the systems which have become known in the art always constitute a compromise solution which is not very effective.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to make it possible to influence with simple measures the duration of the after-running time in cutting mechanisms of paper shredders merely in dependence on the load and automatically without having to preadjust any values; in other words, the drive is to be stopped automatically only when the cutting rollers have actually completely run free, i.e., are cleaned.
In accordance with the present invention, the above-described object is met in a surprisingly simple manner by providing at least one of the gear stages between the drive motor and the pair of cutting rollers with a spiral or helical gear unit, wherein at least one of the gear wheels of the gear unit is mounted so as to be axially movable in the direction of its axis, and wherein a switching element or limit switch connected to the motor control is arranged in the range of the axial distance of movement of the at least one gear wheel.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
REFERENCES:
patent: 5662280 (1997-09-01), Nishio et al.
patent: 5775605 (1998-07-01), Tsai
Kueffner Friedrich
Rosenbaum Mark
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