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Title:
MACHINE FOR WORKING RIBBON-SHAPED ELEMENTS
Document Type and Number:
WIPO Patent Application WO/2014/178089
Kind Code:
A1
Abstract:
A machine (1) for working a ribbon-shaped element (Tl, T2', T2") is described, comprising at least one cutting station (2) crossed by the ribbon- shaped element (Tl, T2', T2"), guiding means (3, 4) adapted to position and drag the ribbon-shaped element (Tl, T2', T2") onto at least one fixed plane (PI) of the cutting station (2) keeping an edge of the ribbon-shaped element (Tl, T2', T2") tangent to a fixed point (Al) of the fixed plane (Pi); at least one of the guiding means (3, 4) rests onto an arm (31) free of rotating with respect to a fixed axis (33); the fixed axis (33) is at the same distance with respect to the cutting station (2) and the at least one of the guiding means (3, 4 ).

Inventors:
PELISSERO ALESSANDRO (IT)
Application Number:
PCT/IT2014/000118
Publication Date:
November 06, 2014
Filing Date:
April 30, 2014
Export Citation:
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Assignee:
BYTE LINE DI PELISSERO ALESSANDRO (IT)
International Classes:
B21D37/20; B21D43/00; B21D53/64; B26D1/12
Domestic Patent References:
WO2007063376A22007-06-07
WO2000061337A12000-10-19
WO2000061337A12000-10-19
WO2007063376A22007-06-07
Foreign References:
JPH11169955A1999-06-29
Attorney, Agent or Firm:
GARAVELLI, Paolo (Via Servais 27, Torino, IT)
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Claims:
CLAIMS

Machine (1) for working a ribbon-shaped element (Tl, T2', T2"), comprising at least one cutting station (2) crossed by said ribbon-shaped element (Tl, T2' , T2") , guiding means (3, 4) adapted to position and drag said ribbon-shaped element (Tl, T2' , T2") onto at least one fixed plane (PI) of said cutting station (2) keeping an edge of said ribbon-shaped element (Tl, T2', T2") tangent to a fixed point (Al) of said fixed plane (PI), characterized in that at least one of said guiding means (3, 4) rests onto an arm (31) free of rotating with respect to a fixed axis (33), said fixed axis (33) being at a same distance with respect to said cutting station (2) and said at least one of said guiding means (3, 4).

Machine (1) for working a ribbon-shaped element (Tl, T2', T2") according to the previous claim, characterized in that said cutting station (2) comprises a pair of side guides (25, 26) arranged along a line coincident with or parallel to or very near a line (28) resting onto said fixed plane (PI) passing by said point (Al) perpendicularly to said ribbon-shaped element (Tl, T2 ' , T2") .

Machine (1) for working a ribbon-shaped element (Tl, T2' , T2") according to the previous claim, characterized in that said at least one of said guiding means (3, 4) comprises contact elements (35, 36) adapted to guide and possibly drag said ribbon-shaped element (Tl, T2', T2") , said contact elements (35, 36) being arranged along a line (55) resting onto said fixed plane (Pi) perpendicularly to said ribbon-shaped element (Tl, T2 ' , T2") .

Machine (1) for working a ribbon-shaped element (Tl, T2', T2") according to the previous claim, characterized in that said fixed axis (33) is approximately perpendicular to said plane (Pi) and a distance between said fixed axis (33) and said line (28) coincides with a distance between said fixed axis (33) and said line (55) .

Machine (1) for working a ribbon-shaped element (Tl, T2', T2") according to the previous claim, characterized in that at least one operating station (6) rests onto an arm (61) free of rotating with respect to a fixed axis (65), said fixed axis (65) being at a same distance with respect to said cutting station (2) and said operating station (6) .

Machine (1) for working a ribbon-shaped element (Tl, T2', T2") according to the previous claim, characterized in that said arm (31, 61) is connected to said machine (1) through a slanted joint made by coupling inclined plane surfaces.

Machine (1) for working a ribbon-shaped element (Tl, T2' , T2") according to any one of the previous claims, characterized in that it comprises an indicating quadrant (37) adapted to check an angular rotation value of said arm (31, 61) and a blocking device (38) adapted to stop and block said arm (31, 61) .

Machine (1) for working a ribbon-shaped element (Tl, T2', T2") according to any one of the previous claims, characterized in that it comprises an actuator composed of a motored assembly (39) , of a type coupled with a screw- scroll system (54) or directly connected along said fixed axis (33, 65), adapted to rotate said arm ( 31 , 61 ) .

Machine (1) for working a ribbon-shaped element (Tl, T2', T2") according to any one of the previous claims, characterized in that said operating station (6) is a folding station.

Description:
MACHINE FOR WORKING RIBBON-SHAPED ELEMENTS

The present invention deals with a machine for working ribbon-shaped elements.

In particular, the invention deals with a machine for producing parts for rotary dinking dies used in the paper field, starting from rectilinear or curved steel ribbons, subjected to a series of workings by means of units arranged along rectilinear, helical or circular trajectories with different radiuses.

As regards rotary dinking dies, suitably worked pieces of ribbon are applied onto cylinders, typically made of wood, inserted into suitable slits obtained on their side surface. Each piece of ribbon, having rectilinear or curved shape, is inserted into its corresponding slit and arranged along the cylinder axis or along a slanted axis.

A typical machine for working ribbon crops to be inserted in dinking dies comprises a dragging apparatus and a series of ribbon working stations adapted to cut, bend, mark, etc. The positioning of apparatuses and stations depends on the ribbon geometry to be subjected to the series of workings.

In the specific field of rotary dinking dies, the art of a machine for working ribbon-shaped elements was developed along two directions: a) machines arranged to operate limitedly and exclusively with a rotary ribbon with fixed radius, choosing every time the sizes which are more requested by users; b) machines arranged with multi-axle systems adapted to position the working devices along paths with variable, even rectilinear, radius.

The first solution for this problem is disclosed in WO2000061337.

The second solution for this problem is disclosed in WO2007063376.

In view of this prior art, object of the present invention is solving, on one end, the limits of embodiments with fixed radius, and on the other end, the complexity of multi-axle embodiments, by providing a machine equipped with a series of working apparatuses and stations placed along a circular trajectory with variable radius, even rectilinear, possibly complying with an helical angle to facilitate the fitting with the helical shape of a roll of curvilinear ribbon, by adjusting a single movement for every apparatus and station .

The above and other objects and advantages of the invention, as will appear from the following description, are obtained by a machine for working ribbon-shaped elements as claimed in claim 1. Preferred embodiments and non-trivial variations of the present invention are the subject matter of the dependent claims.

It is intended that all enclosed claims are an integral part of the present description.

It will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) could be made to what is described, without departing from the scope of the invention, as appears from the enclosed claims.

The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example, with reference to the enclosed drawings, in which:

Figure 1 shows an axonometric view of a cylinder of a rotary dinking die in which sections of rectilinear and curvilinear ribbon must be inserted, which can be obtained with an embodiment of the machine for working ribbon-shaped elements according to the present invention;

Figure 2 shows an axonometric view of a spirally wound rectilinear ribbon, from which the sections of rectilinear ribbon are obtained;

Figure 3 shows an axonometric view of a helically wound curvilinear ribbon from which the sections of curvilinear ribbon are obtained;

Figures 4 and 5 show geometric constructions which are the theoretical foundation for an embodiment of the machine for working ribbon-shaped elements according to the present invention;

Figures 6 and 7 shows an axonometric view and a plan view of different configurations of an embodiment of the machine for working ribbon-shaped elements according to the present invention;

Figure 8 shows an axonometric view of a first preferred embodiment as an example of the machine for working ribbon-shaped elements according to the present invention;

Figures 9 and 10 shows an axonometric view and a plan view of a second embodiment as an example of the machine for working ribbon-shaped elements according to the present invention;

Figures 11a, lib, 11c show orthogonally projected views of a slanted joint in a configuration for rectilinear ribbon of an embodiment of the machine for working ribbon-shaped elements according to the present invention;

Figures 12a and 12b show orthogonally projected views of the slanted joint, in a first curvilinear configuration; and

Figures 13a and 13b show orthogonally projected views of the slanted joint in a second curvilinear configuration.

With reference to Figures 1, 2, 3, a piece of rectilinear ribbon Dl inserted into a slit Gl parallel to the main axis of a cylinder C is obtained by working a spirally wound ribbon-shaped element Tl.

A piece of curvilinear ribbon D2 inserted into a slit G2, slanted by a certain angle on the side surface of the cylinder C, is obtained by working a helically wound ribbon-shaped element T2' , T2".

With reference to Figures 4 to 7, a machine 1 for working a ribbon-shaped element Tl, T2', T2" comprises at least one cutting station 2 crossed by the ribbon-shaped element Tl, T2' , T2", guiding means 3, 4 adapted to position and drag the ribbon- shaped element Tl, T2' , T2" onto at least one fixed plane PI of the cutting station 2, keeping an edge of the ribbon-shaped element Tl, Ί2' , T2" tangent to a fixed point Al of the fixed plane PI.

Next to the cutting station 2, the helical trajectory of the ribbon-shaped element Ύ2' , T2" can be approximated as purely circular planar figure .

With this approximation, the ribbon-shaped element Tl, T2' , T2" rests on the fixed plane PI and the possible edges traced by the ribbon-shaped element Tl, T2' , T2" remain tangent to the fixed point Al of the fixed plane PI.

At least one of the guiding means 3, 4 rests on an arm 31 free of rotating with respect to a fixed axis 33.

The fixed axis 33 is at the same distance with respect to the cutting station 2 and at least one of the guiding means 3, 4.

The cutting station 2 comprises a pair of side guides 25, 26 arranged along a line coincident with or parallel with or very near a line 28 resting on the fixed plane PI passing by the point Al perpendicularly to the ribbon-shaped element Tl, Τ2', T2".

At least one of the guiding means 3, 4 comprises contact elements 35, 36 adapted to guide and possibly drag the ribbon-shaped element Tl, T2' , T2". The contact elements 35, 36 are arranged along a line 55 resting on the fixed plane PI perpendicularly to the ribbon-shaped element Tl, T2', T2".

The fixed axis 33 is approximately perpendicular to the plane PI and the distance between the fixed axis 33 and the line 28 coincides with the distance between the fixed axis 33 and the line 55.

With reference to Figures 4, 5, it is possible to clarify the geometric operating principle. A pair of rectilinear segments coming out of a generic point P external to a circumference and tangent thereto in two points Al and A2 has segments with the same length.

According to the geometric reconstruction, a sheaf of circumferences CI, C2, C3 (this latter one degenerate and coincident with a straight line) tangent to a single point Al has the property according to which any rectilinear segment coming out of a generic point P whose length is the same as the length between point P and the commonly tangent point Al, is always tangent to any circumference of the sheaf CI, C2, C3 in the respective points A2, A3, A4 coincident with the other end of the rectilinear segment.

With reference to Figures 9, 10, at least one operating station 6 rests on an arm 61 free of rotating with respect to a fixed axis 65.

The fixed axis 65 is at the same distance with respect to the cutting station 2 and the operating station 6.

With reference to Figures 11 to 13, the ribbon-shaped element T2', T2" follows a helical trajectory with an increasing slant upon increasing the distance from the cutting station 2.

In order to better match the action of the guiding means 3, 4 and that of the operating station 6, a slanted joint allows the arm 31, 61 to change its own attitude depending on the helix radius of the ribbon-shaped element T2', T2", and therefore depending on the higher or smaller curvature with which the section of ribbon must be addressed and positioned on the plane PI.

The slanted joint adapted to connect the arm 31, 61 to an arm 11, 12 integral with the fixed structure of the machine 1 is composed of a pair of slanted surfaces.

With reference to Figure 8, the machine 1 comprises an indicating quadrant 37 adapted to check the angular rotation value of the arm 31 and a blocking device 38 adapted to stop and block the arm 31.

The indicating quadrant 37 can also be used to check the angular rotation value of the arm 61. The blocking device 38 can also be used to stop and block the arm 61.

With reference to Figures 9, 10, the machine 1 can comprise an actuator composed of a motored assembly 39, of the type coupled with a screw- scroll system 54, or directly connected along the fixed axis 33.

According to a preferred configuration of the machine 1, the operating station 6 is a folding station .