BANDSAW WITH A SHAPED BAND BLADE

Abstract

A bandsaw having a shaped band blade, at least one pair of flywheels (5, 6) arranged to move the shaped band blade; a motor member (7) connected to at least one flywheel of the pair of flywheels; a bench (8) for supporting and feeding at least one object to be cut, wherein the shaped band blade (1) has a band having a variable width between an area (2) of minimum width and an area (3) of maximum width.

Claims

1. A bandsaw comprising: a shaped band blade; a pair of flywheels arranged to move said shaped band blade; a motor connected to at least one flywheel of said pair of flywheels; a bench for supporting and feeding a log of material to be cut, wherein said shaped band blade comprises a band having a variable width between an area of minimum width and an area of maximum width.

2. The bandsaw according to claim 1, wherein the variation in width of said shaped band blade from said area of minimum width to said area of maximum width takes place according to a linear trend.

3. The bandsaw according to claim 1, wherein the variation in width of said shaped band blade from said area of minimum width to said area of maximum width defines a cutting edge inclined with respect to a cutting direction of the shaped band blade.

4. The bandsaw according to claim 1, wherein the variation in width of said shaped band blade from said area of minimum width to said area of maximum width defines two cutting edges inclined on opposite sides with respect to a cutting direction of the shaped band blade.

5. The bandsaw according to claim 1, wherein said bench comprises a cradle for housing the log of material.

6. A machine for converting materials arranged in logs comprising the bandsaw according to claim 1.

Description

[0019] Further features and advantages of the invention will be more evident from the more detailed description set forth below, with the aid of the drawings, which show a preferred implementation thereof, illustrated by way of non-limiting example, wherein:

[0020] FIGS. 1-2 show, respectively in a front and side plan view, a bandsaw with a shaped band blade according to the invention;

[0021] FIGS. 3-4 show, in an open front plan view and in a perspective view, the structure and the operating principle of a shaped band blade for a bandsaw according to the invention.

[0022] With reference to the details of the figures, a bandsaw M according to the invention comprises: [0023] a band blade 1, shaped to vary linearly from an area 2 of minimum width to an area 3 of maximum width, so as to define at least one cutting edge 4, inclined with respect to the cutting direction of the blade; [0024] at least one pair of flywheels 5, 6 for operation of said band blade 1, at least one of the which associated with a motor member 7; [0025] a bench 8 for supporting and feeding logs L to be cut, provided with cradles 9 for housing the logs.

[0026] As is apparent in FIGS. 3 and 4, the particular shape of the band blade 1 allows the bandsaw M, forming the subject matter of the invention, to perform the stepped movements of the logs L close to its area of minimum width 2 and to make the cut, by means of the related inclined cutting edge 4, during the subsequent passage of the blade from its area 3 of maximum width, thereby allowing the advantageous elimination of the cutting and return movements commonly performed by current industrial bandsaws, and the mechanical inertia resulting from these movements.

[0027] Said bandsaw M can be advantageously applied in the paper converting sector, and in particular in the cutting of wound logs L, into toilet paper or kitchen towel or similar products, to be sold to the final consumer.

[0028] Said bandsaw M can if necessary be adapted to cut logs L of materials of any type (wood, polymer, metals, etc.) modifying its method of variation from the area 2 of minimum width to the area 3 of maximum width of the related band blade 1, and the characteristics of the inclined cutting edges 4 (smooth, serrated, etc.) and of the construction materials (metal alloys, composites, etc.) of the blade. Advantageously the number of flywheels can also be increased.

[0029] Operation of the bandsaw is as follows.

[0030] The logs L, at least individually or in pairs, in this latter case advantageously arranged on the right and on the left of the band blade 1 inside the cradles 9, are fed during the passage of the area 2 of minimum width of the band blade 1 near the bench 8. At the passage of the area 3 with width increasing to the maximum width, each single log L is cut without the need for any shifting movement of the log or the blade.

[0031] The cutting process can thus take place only with the movement for stepped feed of the log(s) and of rotation of the flywheels that transmit motion to the shaped blade.