Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1992-09-17
1994-03-15
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74 68, 74110, 267160, 248619, F16H 2118
Patent
active
052937828
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process for driving a movable surface in a reciprocating motion in a plane. The invention also relates to a device for implementing the process.
BACKGROUND ART
In the field of web perforation, and particularly when very high accuracy is required in positioning the perforations, it is necessary to have such reciprocating motion in a plane. Thus, the French patent application No. 9,003,697 filed Nov. 19, 1990 and entitled Device for Carrying Out an Operation on a Web according to a Given Pitch, corresponding to uncurrently filed, allowed U.S. Ser. No. 07/927,501, describes a device comprising a punch block support arm describing, in an reciprocating manner, a short portion of an arc of a circle around a stationary horizontal axis parallel to the movement axis of the web, so as to be able to cause the punches do cooperate periodically with a die provided on a die block. The punch block support arm is connected to the die block at the level of the stationary horizontal axis, the two blocks connected in this way being driven parallel to the movement axis of the web by a reciprocating movement of a generally identical period to that of the movement of the punch block support arm around the stationary axis. In these perforators, the period of the reciprocating movement can be in the order of 37 ms for a magnitude of approximately 20 mm.
For such devices, combining at the same time speed and accuracy, it is of great importance that the horizontal reciprocating movement be exactly parallel to the plane of the web and that the movement be constantly carried outin the same plane.
In the previous technique, it was known to use crank-connecting rod mechanisms, which could be of the eccentric type, to produce such reciprocating movement, the movement being guided in a same plane by means of suitable sliding mechanisms. For very high frequency reciprocating movements, these mechanisms suffered from quite fast wear, making the guiding movement increasingly inaccurate. Furthermore, such guiding mechanisms often generated jerks in the reciprocating movement. Such jerks are, of course, detrimental to the accuracy of positioning perforations on the web.
SUMMARY OF THE INVENTION
Consequently, one of the objects of this invention is to provide a process making it possible to drive a movable surface with a reciprocating movement in a plane, without employing sliding type guide mechanisms as are used in the previous technique.
Another object of this invention is to provide a device for implementing this process.
Other objects of this invention will appear during the course of the more detailed description which follows.
According to this invention, a structure, which can be distorted, is realised to move, according to a reciprocating movement or displacement of magnitude A.sub.2, a surface lying in a first plane comprising, in a plane orthogonal to the first one, two parallelograms, which can be distorted, each having two sides parallel to the first plane, one of these parallel sides being common to the two parallelograms and driven in a second plane, parallel to the first one, by means of a first driving means, by a reciprocating movement or displacement of magnitude A.sub.1 =A.sub.2 /2, the other parallel side of the two parallelograms being arranged in a third plane, parallel to said first one, said other parallel side of said first parallelogram being stationary, the other parallel side of the second parallelogram being movable and driven in the third plane, by means of a second driving means, by a reciprocating movement of magnitude A.sub.2 in phase with the movement of magnitude A.sub.1.
According to this invention, a process is also provided for moving, in a reciprocating movement of magnitude A.sub.2, a surface arranged in a first plane, comprising the following stages: which can be distorted, each having two sides parallel to the first plane, one of these parallel sides, arranged in a second plane parallel to the first one, being common to the two parallelograms an
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IBM Technical Disclosure Bulletin; vol. 22 No. 7; Dec. 1979; "Spatially Linear Motion Device for Printers and Scanners"; W. B. Pennebaker.
Gaudillat Jacques
Long Michael
Eastman Kodak Company
Herrmann Allan D.
Snee, III Charles E.
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