CN106488988B

CN106488988B - Leather stamping machine

Info

Publication number: CN106488988B
Application number: CN201580022717.9A
Authority: CN
Inventors: F.帕斯夸勒蒂
Original assignee: Aeffe Machinery Srl
Current assignee: Aeffe Machinery Srl
Priority date: 2015-01-23
Filing date: 2015-11-18
Publication date: 2020-02-21
Anticipated expiration: 2035-11-18
Also published as: EP3247810B1; EP3247810A1; CN106488988A; ES2714296T3; WO2016116787A1

Abstract

Punching machine for leather or sheet material in general, suitable for performing punching, imprinting, plating, chiseling, wherein the sheet material to be machined is moved forward lying on a conveyor belt which brings it into a position corresponding to the working portion of the machine between a tool holder head driven with a reciprocating movement to perform the working movement and a support plane. The seating plane is inclined with respect to a direction of movement of a machining tool having a working surface comprising a flat portion parallel to the seating plane. Thanks to the aforementioned configuration of the abutment plane and of the tool, the machine is able to perform a specific carving operation with a cutting portion that extends obliquely with respect to the thickness direction of the leather.

Description

Leather stamping machine

Technical Field

The present invention relates generally to a machine for punching leather or sheet material, suitable for performing punching, imprinting, plating, chiseling, in which the sheet material to be machined is moved forward lying on a conveyor belt which brings it to the machining part of the machine between a tool holder head mounted on an upper crossbar driven by a reciprocating movement to perform a working stroke and a seating plane.

Background

In the field of the manufacture of footwear or leather products in general, it is generally known that the use of leather or the like, which is subjected to specific finishing operations, is intended to impart a particular aesthetic appearance to the final product. This refers in particular to processes suitable for making cuts or perforations having a clear geometric pattern that is repeated over the entire surface of the product, as well as for imprinting the outer surface or applying a plating material having various shapes and sizes uniformly distributed over the surface.

In order to obtain a repetition of the decorative design on the entire surface of the sheet material, machines are currently applied which are suitable for performing the above-mentioned processes in a sufficiently accurate and automatic manner.

These conventional machines, generally referred to as punching machines, basically comprise: two uprights; an upper cross bar installed on the uprights to vertically slide; a tool holder head mounted on the underside of the upper crossbar such that a machining tool projects downwardly from the lower end of the upper crossbar; a drive member of the upper cross bar for determining the vertical sliding of the upper cross bar with respect to the uprights, so as to cause it to perform a reciprocating movement of raising and lowering, which constitutes a working stroke of the head of the tool holder; a lower cross bar; a seat assembly mounted on the lower cross bar, the seat assembly including a seat plane disposed substantially horizontally in a vertical position on the tool holder head and vertically adjustable; means for adjusting the working depth, said means for adjusting the working depth being adapted to adjust the vertical position of the horizontal seating plane to adjust the working depth corresponding to the distance between the tool working surface of the tool holder head and the horizontal seating plane when the tool holder head is in the position of lower end travel; a transfer assembly comprising a conveyor belt stretched from a first drum with a horizontal axis placed on the input side of the machine, passing through the working portion of the machine in an unwound configuration, laying flat on the seating plane and interposed between the seating plane itself and the tool holder head, and rewinding on a second drum with a horizontal axis arranged on the output side of the machine; conveying means of the conveyor belt which regulate the unwinding of the conveyor belt at the first roller, the conveying of the conveyor belt in the unwound configuration corresponding to the forward movement of the process in the processing section and the rewinding of the conveyor belt on the second roller.

The sheet material to be processed is laid in sequence on the conveyor belt in an unwound configuration on the input side of the machine, is subsequently pulled through the processing section by the advancement of the conveyor belt, and then leaves the machine on the output side thereof, still due to the advancement of the conveyor belt, before the conveyor belt is wound again around the second drum. In the machining section, the reciprocating vertical movement of the head of the tool holder brings the tool into vertical movement with respect to the seating plane on which the conveyor belt extends, so that the tool comes into contact with the sheet material on its downward stroke to perform the planned cutting, punching, imprinting and the like, which depends mainly on the geometry of the tool and the set machining depth.

Although the above-described conventional machines are capable of performing a wide range of processes on leather or generally sheet-like materials, they have important limitations in their ability to perform certain machining operations (e.g., chiseling, engraving, scoring processes, etc.) in which the tool must interact with the material being processed with a movement that is not perpendicular to the material being processed but is oblique, parallel, or tangential to the material being processed. Indeed, in traditional punching machines, a process of the above-mentioned kind can be carried out by coordinating the machining movement of the tool holder head with the advancing movement of the transfer assembly, however the quality and the kind of process that can be achieved are very limited.

Disclosure of Invention

The aim of the present invention is to propose a machine for carrying out machining of sheet-like materials (for example leather, synthetic fibres, etc.) which allows to carry out the machining efficiently, in which the machining movement involves a relative movement between the tool and the material being machined which is not perpendicular to the surface of the material being machined itself, for example in the case of a carving, engraving, scoring process, etc.

A further object of the present invention is to propose an extremely versatile machine for machining sheet-like materials, i.e. by means of which a wide range of processes can be carried out efficiently.

Another object of the present invention is to propose a machine for machining sheet-like materials, by means of which it is possible to carry out simultaneously the process of engraving and moulding, in particular the machining of the so-called "reptile scales", aimed at reproducing the effect of the scales of the reptile skin on the leather.

The above objects and others are achieved by a machine for machining sheet-like materials (e.g. leather, synthetic fibres, etc.).

Traditionally, machines for machining sheet materials comprise: at least two uprights; a movable upper cross bar mounted on the upright in a sliding mode; a tool holder head mounted on the upper crossbar such that a tool projects downwardly from a lower end of the upper crossbar; a drive member of the upper cross bar for causing the upper cross bar to slide relative to the upright so as to perform a reciprocating movement, the reciprocating movement being a working stroke of the tool holder head; a workpiece support assembly mounted below the upper cross bar in correspondence with the upper cross bar and including a seating plane disposed substantially perpendicular to a direction of movement of the tool holder head; setting means for adjusting the working depth, said setting means for adjusting the working depth being adapted to adjust the position of the abutment plane relative to the tool holder head; a conveyor assembly including a conveyor belt traversing on a support plane in a deployed configuration through the machining section between the tool holder head and the support plane, the sheet material workpiece being transported to the machining section while lying flat on the conveyor belt.

According to a characteristic aspect of the invention, the abutment plane is arranged inclined at an angle of between 10 ° and 60 ° with respect to the direction of the working stroke of the tool holder head, and the tool holder head comprises a tool shaped so that the working end of the tool has a working surface adapted to come into contact with the workpiece, said working surface comprising at least a flat portion parallel to the abutment plane.

The inclination of the seating plane with respect to the direction of movement of the machining, in connection with tools having a contact surface with the workpiece parallel to the seating plane (and therefore to the workpiece surface), allows to perform a carving operation with a cutting portion that penetrates the workpiece in a direction that is not perpendicular to the thickness of the workpiece.

Advantageously, the flat portion of the working surface of the tool is provided with a rounded and/or beveled outer perimeter and an inner perimeter comprising at least one portion having a cutting edge.

The geometry of the tool allows for having at least one cutting edge of the working surface of the tool that applies pressure to the workpiece without cutting portions of the workpiece and producing a cut.

Still advantageously, the seat plane is elastically yielding, preferably consisting of a thick steel element or other substantially rigid material, more preferably coated with a material having high elasticity (for example elastomer or the like).

The elasticity of the abutment plane allows to partially absorb the forces exerted by the tool on the workpiece, thus allowing to obtain both the moulding operation and the scoring operation on the material.

Still advantageously, the tool holder head is constrained to the upper crossbar to slide in the longitudinal direction of the crossbar itself, and the machine comprises a second driving member adapted to perform a sliding movement of the tool holder head with respect to the upper crossbar.

Due to the possibility of adjusting the lateral position of the tool holder head, it is possible to enlarge the range of machining operations that can be performed or alternatively to reduce the total number of tools mounted on the tool holder head and consequently its cost.

Drawings

These and other advantages and features of the machine of the invention will be immediately understandable from the following detailed description of a specific embodiment of the invention, given by way of example only and not by way of limitation, with the aid of the accompanying drawings, in which:

FIG. 1 is a perspective view of a machine according to the present disclosure from the input side;

FIG. 2 is a schematic front view from the output side of the major components of the machine of FIG. 1;

FIG. 3 is a schematic side cross-sectional view of the machine of FIG. 1;

FIG. 4 is a detailed view of FIG. 3 showing the processing portion of the machine of FIG. 1: FIG. 4a shows the tool holder head in an upper end stroke position, and FIG. 4b shows the tool holder head in a lower end stroke position;

FIG. 5 is a detail of FIG. 4 b;

FIG. 6 shows a side cross-sectional view of a tool of the tool holder head associated with the machine of FIG. 1;

fig. 7 is a bottom view of the tool of fig. 6.

Detailed Description

With reference to fig. 1 to 3, a machine 10 for processing sheet-like materials (for example leather, synthetic fibres, etc.) is shown as a whole. In fig. 1, a machine 10 is shown in perspective view in a complete configuration with a housing and a guard. A schematic view of the same machine 10 is shown in fig. 2 and 3, which shows only the mechanical structure and the main components, omitting the protective casing, the electrical and electronic parts, and other components that are not essential to the disclosure of the invention. The structure of the machine essentially comprises two

parallel uprights

12, 13 which are fixed together by a lower bracket 14 and an upper fixed cross member 15, in addition to which the lower bracket 14 is apt to support a workpiece support assembly 20 in an embodiment of the invention.

A movable crossbar 30 is connected to the

side uprights

12, 13 to slide vertically relative thereto by means of sliding guides 31, while remaining interposed between the upper cross member 15 and the support assembly 20. The driving means 40 adapted to perform the vertical reciprocating movement of the movable crosspiece 30 comprise two crank mechanisms located outside the

uprights

12 and 13 and driven by a motor 41.

The movable crossbar 30 supports underneath a tool holder head 50 constrained to the movable crossbar for sliding in the transverse direction of the machine, which corresponds to the length direction of the movable crossbar 30 itself. The tool holder head 50, shown in detail in fig. 4, is fixed to the movable crossbar 30 by means of two

sliding guides

51, 52 and supports, underneath, a plurality of tools 60, which project downwards (i.e. towards the support assembly 20). The second drive member 53 is provided integrally with one of the crank mechanisms of the first drive member 40 to interface with the tool holder head 50 and operate movement in a transverse direction relative to the movable cross bar 30 and thus also relative to the support assembly 20.

The transfer assembly 70 comprises a conveyor belt 71 unwound from a supply log (supply log) 72 mounted on an unwinding roller 73 having a horizontal axis, placed on the input side of the machine 10, which advances in an unwound configuration between the tool holder head 50 and the support assembly 20 through a working portion 80 of the machine and finally rewound on a return log 74 mounted on a winding roller 75 having a horizontal axis, arranged on the output side of the machine 10. The workpiece P to be machined is loaded in a flat configuration on a portion of the conveyor belt 71 extending horizontally at the input side of the machine 10, so as to define a loading surface C. The advancement of the conveyor belt, which is located on the support assembly 20, conveys the sheet material P in correspondence with the processing portion 80. Once processed, further advancement of the conveyor belt 71 conveys the workpiece P for discharge onto a discharge tray S, suitably arranged on the output side of the machine 10. In order to convey the conveyor belt along the path described above, the conveyor assembly 70 visible in fig. 1 and 3 obviously comprises pulling means, deflecting rollers, supporting rollers, tensioning devices and supporting brackets, as generally known art, only schematically described and not indicated with reference numerals. Furthermore, as can be seen in fig. 2, the transfer assembly 70 has been omitted entirely in order to make the other components of the machine described above more visible and understandable.

The support assembly 20 comprises one or more support groups, each of which is adjustable in the vertical direction, and each of which comprises a lower sloping planar element 21, an upper sloping planar element 22 and a mechanism 23 for adjusting the working depth, by means of which, as shown by the arrows in fig. 4b, the position of the machine in-out direction is changed, changing the position of the upper sloping planar element 22 in height and thus the position of the abutment member 24 supported by said upper sloping planar element. As mentioned, there may be a single support assembly extending laterally across the entire length of the tool holder head 50, or there may be multiple support groups placed laterally side by side with each other to allow for more independent adjustment of the working depth in the respective cross-section of the machine. The abutment member 24 comprises an upper sliding surface 25 for sliding the conveyor belt and an abutment plane 26 extending in a vertical position of the tool holder head 50. Although in the machines of the known art the sliding surface of the conveyor belt and the seating plane of the tool holder head are substantially coplanar and horizontal, in the present invention the sliding surface 25 is substantially horizontal, while the seating plane is adjacent to said sliding surface but inclined downwards. In the depicted embodiment, the abutment plane 26 forms an angle of 35 ° with the vertical and with the direction of movement of the tool holder head 50. More generally, according to the invention, the abutment plane 26 forms an angle of between 10 ° and 60 ° with the direction of movement of the tool holder head 50. The abutment member 24 is advantageously made of steel or another material with similar mechanical characteristics, the counter-sliding surface 25 and the abutment plane 26 being defined by a coating made of a highly elastic element 27 (for example an elastomer carpet) able to undergo elastic deformation under the action of the tool 60, so as to relieve the forces exerted on the workpiece P. The highly elastic element 27 is constrained to the seat member 24 in a removable mode (for example by means of a threaded member) so as to be easily replaceable in case of wear or breakage.

One or more tools 60 project downwardly from the tool holder head 50 in a working portion 80 of the machine. With reference to fig. 6 and 7, in the embodiment described, the tools 60 are made up of a plurality of punches arranged in two rows in the transverse direction, more precisely, a first row of tools 60a is arranged upstream in the direction of advance of the conveyor belt 71 and a second row of tools 60b is arranged downstream of said first row of tools in the direction of advance of the conveyor belt 71. Each tool 60 has a generally cylindrical outer shape with a hollow interior, with a working end 61. The working end 61 has a working surface 62 of the tool adapted to come into contact with the workpiece P, said working surface comprising at least a flat portion 63 parallel to the seating plane 26. The working surface 62 of the tool is also provided with an outer peripheral portion 64 suitable for connecting the flat portion 63 with the outer lateral surface 65 of the working end 61 without forming sharp edges, and an inner periphery comprising an inner rounded peripheral portion 66 suitable for connecting the flat portion 63 with the inner lateral surface 67 of the working end 61 without forming sharp edges, and an inner cutting peripheral portion 68 suitable for forming sharp edges between the flat portion 63 and the inner lateral surface 67. The flat portion 63 of the tool 60a of the tool upstream row is coplanar with the flat portion 63 of the tool 60b of the tool downstream row, whereby the tool 60a of the upstream row and the tool 60b of the tool downstream row simultaneously machine the workpiece P and have the same working depth.

The reciprocating movement of the movable crossbar 30 drives the reciprocating working movement of the tool 60, which includes a downward working stroke and a return upward stroke. In fig. 4a, the tool is shown in the upper stroke position, wherein the tool is suitably spaced from the abutment plane 26 and thus from the conveyor belt 71 extending above the abutment plane and the workpiece P arranged thereon. In the detailed views of fig. 4b and 5, the tool 60 is in the lower end stroke position while performing a machining operation on the workpiece P. The flat portion 63 of the working surface of the tool is parallel to the seating plane 26 and therefore exerts a uniform pressure on the workpiece P by performing the process of moulding the workpiece P, while the inner cutting peripheral portion 68 exerts a cutting action that does not pass through. The highly elastic element 27 elastically deforms and partially absorbs the forces of the tool acting on the workpiece P, allowing particularly accurate adjustment of the machining parameters. The actual working depth takes into account the elastic deformation of the workpiece P and the highly elastic element 27.

The above described embodiments have specific advantages and features, however, variants of the above described embodiments and different embodiments of the machine for machining sheet material are of course conceivable while still being within the inventive concept of the present invention.

For example, the shape and dimensions of the machine structure, in particular the uprights, cross-members and the mechanisms that are constrained to each other, may be varied.

The transfer assemblies may be of different types and operate according to different path arrangements than the transfer assemblies shown by way of example in fig. 1 and 3.

The mechanism 23 for adjusting the working depth and the second drive member 53, compared to what is shown in the figures, may also be very different, both as regards their structure and their mode of operation, or may not be present in the machine according to the invention.

The seating plane 26 may be made of steel or another material that has a substantially rigid behavior under the force applied by the movable upper crossbar 30 through the tool 60. Alternatively, instead of providing the coating element 27 with a high degree of elasticity, the elastically deformable abutment plane 26 can be realized in a different manner, for example by using an elastically deformable abutment member 24.

The tools 60 mounted on the tool holder head 30 may also be very different in number, arrangement and geometry compared to tools described as being particularly suitable for performing the so-called "reptile" process, which is intended to reproduce the effect of reptile skin flakes on leather without passing through it, by a simultaneous and combined process of moulding and carving.

It is clear that other modifications and variations may be made to what has been shown by way of example, without thereby abandoning the scope of the protection of the inventive concept as claimed below.

Claims

1. A machine (10) for machining workpieces (P) of sheet material, comprising: at least two uprights (12, 13); a movable upper cross bar (30) mounted on said at least two uprights (12, 13) in sliding mode; a tool holder head (50), said tool holder head (50) being mounted on said movable upper crossbar (30) such that a tool (60) projects downwardly from a lower end of said movable upper crossbar; -a driving member (40) of said movable upper crossbar (30) to cause the sliding of the movable upper crossbar (30) with respect to said uprights (12, 13) so as to cause it to perform a reciprocating movement, which is the working stroke of said tool holder head (50); a workpiece support assembly (20), said workpiece support assembly (20) mounted below said movable upper cross bar (30) and including a seating plane (26); -setting means (23) for adjusting the working depth, said setting means (23) for adjusting the working depth being adapted to adjust the position of said seating plane (26) with respect to said tool holder head (50); a transfer assembly (70), said transfer assembly (70) comprising a conveyor belt (71), said conveyor belt (71) being arranged in a spread configuration on said seating plane (26) through a machine work portion (80) placed between said tool holder head (50) and said seating plane (26), said sheet material workpiece (P) being transported by said conveyor belt (71) to said machine work portion (80), said machine (10) being characterized in that: the seating plane (26) is arranged inclined by an angle of between 10 ° and 60 ° with respect to the direction of the working stroke of the tool holder head (50), the tool holder head (50) comprising a shaped tool (60) so that a working end (61) of the tool has a working surface (62) adapted to come into contact with a piece of sheet material, the working surface (62) comprising at least a flat portion (63) parallel to the seating plane (26).

2. The machine of claim 1, wherein: the working surface (62) of the tool comprises at least one portion having a cutting edge of the tool (60).

3. The machine of claim 2, wherein: the working surface (62) is provided with an outer rounded peripheral portion (64) and an inner periphery, the outer rounded peripheral portion (64) being adapted to connect the flat portion (63) with an outer lateral surface (65) of the working end (61) without forming sharp edges, the inner periphery comprising an inner rounded peripheral portion (66) and an inner cut peripheral portion (68), the inner rounded peripheral portion (66) being adapted to connect the flat portion (63) with an inner lateral surface (67) of the working end (61) without forming sharp edges, the inner cut peripheral portion (68) being adapted to form sharp edges between the flat portion (63) and the inner lateral surface (67).

4. The machine according to any one of claims 1 to 3, characterized in that: the abutment plane (26) is elastically deformed.

5. The machine of claim 4, wherein: the workpiece support assembly (20) comprises a seat member (24) made of steel, the seat plane (26) being realized by covering with a highly elastic element (27).

6. The machine according to any one of claims 1 to 3, characterized in that: the work support assembly (20) is provided with the setting member (23).

7. The machine according to any one of claims 1 to 3, characterized in that: the tool holder head (50) is constrained to the movable upper crossbar (30) in a sliding mode in the length direction of the movable upper crossbar (30), the machine (10) comprising a second driving member (53) adapted to perform the sliding of the tool holder head (50) with respect to the movable upper crossbar (30).