Cutting – Cutting motion of tool has component in direction of moving... – Orbital motion of cutting blade
Patent
1996-11-14
1998-11-17
Rachuba, M.
Cutting
Cutting motion of tool has component in direction of moving...
Orbital motion of cutting blade
83345, 83672, B26D 1147
Patent
active
058362282
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to apparatus for cutting sheet material, particularly (but not exclusively) for slitting a metal foil or web.
U.S. Pat. No. 5,142,755 discloses apparatus for slitting a metal foil for this purpose. The apparatus comprises two contra-rotating cylinders, one of which carries on its outer periphery a series of cutting knives, and the other of which is suitably recessed so as to accommodate the knives as the latter cut the metal foil between the two cylinders. Such an arrangement requires accurate registration of the knives and recesses and demands tight dimensional tolerances which are difficult to achieve in practice. The present invention aims to provide apparatus for cutting sheet material, for example cutting slits extending generally transverse to the longitudinal direction of a web of the material, in which the dimensional tolerances are less stringent.
SUMMARY OF THE INVENTION
According to the invention, there is provided apparatus for cutting sheet material, the apparatus comprising two rotatable members, namely a driving member and a driven member, each member having on its periphery a plurality of ribs at a predetermined pitch and helix angle, the pitch of the ribs on the driving member being smaller than the pitch of the ribs on the driven member, and the helix angle of the ribs on the driving member being of opposite direction to, and of smaller magnitude than, the helix angle of the ribs on the driven member. In use, the ribs on the driving member engages and drives the ribs on the driven member, and the ribs cooperate to cut the sheet material with a shearing action.
The driven member is preferably subjected to a restraining torque to ensure that the driven member remains in contact with the driving member.
Each member is preferably cylindrical with a continuous series of grooves around its periphery, each of said ribs being defined between a corresponding pair of the grooves. In a preferred embodiment, the driving member and driven member have the same number of ribs around their respective peripheries, the diameter of the driving member being smaller than the diameter of the driven member as a consequence of the smaller pitch of the ribs on the driving member as compared with the pitch of the ribs on the driven member.
The ribs on the driven member may be interrupted by slots so that the apparatus cuts slits across the width of the sheet material. Such a slitted sheet can be expanded to form a metal mesh. Alternatively, if each rib on the rib is continuous, the apparatus will cut the sheet material (across a width) into separate strips.
BRIEF DESCRIPTION OF THE DRAWINGS
Apparatus according to the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of the apparatus.
FIG. 2 is a fragmentary perspective view, to an enlarged scale, of part of a driving member of the apparatus.
FIG. 3 is a fragmentary perspective view, to an enlarged scale, of part of a driven member of the apparatus.
FIG. 4 shows a web of sheet material passing between the driving member and the driven member and being cut thereby.
FIG. 5 is a front view of the driving member.
FIG. 6 is a fragmentary sectional view, on an enlarged scale, taken on the line VI--VI of FIG. 5.
FIG. 7 is a front elevational view of the driven member.
FIG. 8 is a fragmentary sectional view, on an enlarged scale, on the line VIII--VIII of FIG. 7.
FIG. 9 is a series of sectional views taken at successive positions in the direction of arrow X in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, the apparatus comprises a driving member in the form of a generally cylindrical driving tool 10 and a driven member in the form of a generally cylindrical driven tool 12. The tools 10 and 12 are rotationally mounted in spaced supports 14, such that the tools 10 and 12 cooperate to form a nip through which is passed a web of metal foil indicated at 16 in FIG. 4.
The driving tool 10, shown in FIGS. 2, 5 and 6
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Guthrie Duncan Richard
Smith David William
Wood John David
Alhamad Shaikh Ghaleb Mohammad Yassin
Barber Frank T.
Cates Charles E.
Rachuba M.
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