Turning – Severing or cut-off – Infeed means
Patent
1987-10-06
1989-05-09
Schmidt, Frederick R.
Turning
Severing or cut-off
Infeed means
82 83, 82 97, 82101, 83 54, B26D 316
Patent
active
048278165
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a cutting apparatus, the especially a tube cutting apparatus.
The publication No. SE-421 499 discloses a cutting apparatus having a cutting blade and means for rotating the tube to be cut during the cutting operation. The cutting blade and the means for rotating the tube are disposed separately from each other and each of them has its own driving mechanism. The cutting blade is arranged to be moved pivotally in a direction perpendicular to the longitudinal axis of the tube during the cutting operation. The constructions of such prior art apparatus is deficient as far as the function and construction is concerned.
SUMMARY OF THE PRESENT INVENTION
The object of this invention is to provide a cutting apparatus, by means of which a simple and functionally reliable cutting is possible. The cutting apparatus will be particularly suitable for rigid tubes, of which cores or barrels made of board can be mentioned as an example.
The according to present invention apparatus comprises means, which support the tube during the cutting operation and at the same time enable the rotatory movement of the tube about its longitudinal axis. The apparatus further comprises a cutting blade and means for rotating the tube, which both are disposed substantially concentrically onto a common shaft. Connected with this shaft, there are both means for rotating the shaft about its longitudinal axis and means for moving the shaft in a direction perpendicular to the longitudinal axis of the tube to be cut.
The means for rotating the tube has a greater diameter than the cutting blade and it has a certain elasticity in a direction perpendicular to the shaft. In this case the means for rotating the tube reaches first the surface of the tube during the first stage of the cutting operation and the tube starts to rotate about its longitudinal axis with a peripheral speed equal to that of the for rotating means. The rotatory movement of the shaft is thus transmitted to the tube, which starts to rotate supported by its support means. When the movement of the shaft towards the longitudinal axis of the tube to be cut is continued, the rotating means, due to the elasticity in the radial direction allows the cutting blade to start to effect on the cutting point of the tube by the cutting edge while the tube continues to rotate about its longitudinal axis. This is possible because the contact between the outer surface of the tube to be cut and the elastic means mounted on the shaft is maintained. After the blade has carried out the cutting operation, the shaft is moved away from the center axis of the tube and at the same time the member rotating the tube is expanding in its radial direction to its original dimensions. The means quarantees in the final stage of this movement, that the blade will be detached from the cutting point, because this elastic means is the last to be in contact with the outer surface of the tube after the cutting has been done. In a summary, the rotatory movement of the tube about its longitudinal axis, the rotatory movement of the cutting blade, the feed movement during the cutting and a reliable return movement after the cutting, are all achieved by means of a simple construction.
According to a preferred embodiment of the present invention, the elastic member for rotating the tube is an inflatable tire placed round the center wheel, which is fixed to the shaft. This makes the realization of the invention possible in a constructionally simple and reliable way.
The present invention will be described in more detail in the following description with reference to the accompanying drawings. In the drawings
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the apparatus using the cutting device according to the invention and
FIG. 2 is a partial sectional view of the cutting device seen in a direction perpendicular to the longitudinal axes of the shaft and the tube to be cut.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The apparatus illus
REFERENCES:
patent: 1215121 (1917-02-01), Cramer
patent: 1322007 (1919-11-01), Golding
patent: 2701015 (1955-02-01), Gottschalk
patent: 3315355 (1967-04-01), Osburn
patent: 3919904 (1975-11-01), Kuts
patent: 4205866 (1980-06-01), Molnar
patent: 4307512 (1981-12-01), Phillips
Schmidt Frederick R.
Shideler Blynn
Vendmatic Oy
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