Machine element or mechanism – Mechanical movements – Reciprocating to reciprocating
Patent
1992-09-21
1994-05-31
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Reciprocating to reciprocating
267 25, 267 47, 267158, 267160, F16H 2144, F16F 118
Patent
active
053158903
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device which makes it possible to prevent any relative translation movement in a first plane between two members movable one in relation to the other in a second plane substantially perpendicular to the first.
BACKGROUND OF THE INVENTION
In the field of web products, when it is necessary to carry out an operation according to a determined pitch, such as a perforating, punching, stamping or stitching operation, it is sometimes necessary to have great precision in positioning the tool carrying out the desired operation.
Thus, in the patent application filed on 17 Sep. 1992 by the applicant and Jacques F. Gaudillat, Ser. No. 7/927,502, entitled "Process and Device for Driving a Surface in a Reciprocating Motion in a Given Plane", a description is given of a device for carrying out an operation, according to a given pitch, on a web movable uniformly and continuously. The device comprises a first block fitted with a tool 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, in order to be able to make the tool cooperate periodically with a member complementary to the tool. The complementary member is provided on a second block, the first block being connected to the second block along the stationary axis. The two blocks are fixed and suspended in this way to a stationary frame and are driven parallel to the movement plane of the web by a reciprocating movement of greater magnitude than the movement of the first block around the stationary axis and of identical period.
For this type of device, particularly when applied to perforating, it is essential that there is no translation movement, in the movement plane of the web, of the blocks in relation to each other.
In the previous technique, it is common to make use of mechanisms of the "SCOTT-RUSSEL" type, which will be described in greater detail in the description which follows and which include a number of joints, pivots or slides. These mechanisms undergo fairly rapid wear, which causes increasing inaccuracies in the positioning of the tool. Furthermore, it is difficult to use such mechanisms when the second plane (i.e, the short portion of an arc of a circle) is not exactly perpendicular to the first plane (i.e. the plane of the web). Such a mechanism is described, for example, in U.S. Pat. No. 3,102,721.
SUMMARY OF THE INVENTION
Consequently, one of the objects of this invention is to supply a device which prevents any relative translation movement in a first plane between two members which can move in relation to each other in a second plane substantially perpendicular to the first and which do not have the drawbacks of the devices of the previous technique.
Another object of this invention is to supply a device offering the advantage of being in a compact form.
Other objects will appear in the course of the detailed description which follows.
The objects of this invention are achieved by producing a device which makes it possible to prevent any relative translation movement in a first plane between two members movable in relation to each other in a second plane substantially perpendicular to the first. The device comprises two linkages (P.sub.1 P.sub.4 and P.sub.2 P.sub.3) which are connected to each other at their middle point by a pivot point C, the two linkages having one of their ends coupled to the first member at a pivot point P.sub.1, respectively, at a pivoting slider point P.sub.3, the other end of the two linkages being coupled to the second member at a pivot point P.sub.2, respectively, at a pivoting slider point P.sub.4. The two linkages are arranged so as to give P.sub.1 C=P.sub.2 C=P.sub.3 C=P.sub.4 C, the device being characterized in that the pivot points and pivoting slider points are composed of flexible portions of the two linkages.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in detail with reference to the annexed drawing plates, in which:
FIG. 1 represent
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patent: 4550619 (1985-11-01), Volk, Jr. et al.
Eastman Kodak Company
Herrmann Allan D.
Snee, III Charles E.
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