WO2008096051A2

WO2008096051A2 - Machine for industrial operations on continuous running complex laps by immobilisation of the lap

Info

Publication number: WO2008096051A2
Application number: PCT/FR2007/002093
Authority: WO
Inventors: Eric Bellet
Original assignee: Mathec Sarl
Priority date: 2007-01-30
Filing date: 2007-12-17
Publication date: 2008-08-14
Also published as: WO2008096051A3; EP2114808B1; FR2911860B1; FR2911860A1; EP2114808A2

Abstract

The invention relates to a machine for carrying out industrial operation on continuous-running complex laps (2) that is provided with a lap immobilisation device (3) at the working station (1). The device for immobilising the lap comprises upstream rollers (31, 32, 33) and downstream rollers (34, 35, 36) and is characterised in that said roller groups are located on either side of the plane (P) defined by the portions (22) and (23) of the lap (2) respectively upstream and downstream from the working station (1), and in that the rollers (31) and (34), which are driven in a translation alternating movement, are simultaneously driven in the same direction using a single holder (38) to which they are attached, said holder being driven by a cam (379 having an outline adapted for imparting the translation alternating movement (T) thereto.

Description

MACHINE CARRYING OUT INDUSTRIAL OPERATIONS ON CONTINUOUS FLOWING COMPLEX PANELS BY IMMOBILIZATION OF THE TABLET

DESCRIPTION

FIELD OF THE INVENTION

The present invention relates to a machine intended for carrying out industrial operations, such as cutting or gluing, on continuously moving webs of complexes, intended in particular for the manufacture of respiratory filter masks or hygienic layers.

BACKGROUND TECHNOLOGY

In the known machines of the kind in question, there are two techniques implementing different means.

A first technique in which the web scrolls continuously at the workstation and where the tools move at the same speed so that the relative speed of the tool and the web is zero: such a technique requires the use of sophisticated means of training and synchronization of tools and limits the tasks to be performed as well as production rates.

A second technique which consists of immobilizing the sheet only at the workstation by means of a device, not modifying the tension of said sheet nor the speed of travel of the parts thereof located respectively upstream and downstream of said post, constituted:

upstream of said station, a first web return roller, movable in space, driven by an alternating translational movement, associated with two other return rollers of said web, fixed in space, located respectively upstream and downstream of the first roller, in a plane distinct from that occupied by said first roller;

downstream of said station, another first web return roller, movable in space, driven by an alternating translational movement, associated with two other return rollers of said web, fixed in space, located respectively upstream and downstream of the first roller, in a plane distinct from that occupied by said first roller.

A similar technique is described in the patent US5277571 where the movable rollers in space move in a reciprocating circular movement by means of two separate rotary arms, located on the same side relative to the plane of the sheet, requiring perfect synchronization of the two drive mechanisms. SUMMARY OF THE INVENTION

The invention aims to implement, in the case of said second technique, an alternative solution for the purpose of simplifying the device for immobilizing the web. For this purpose, said device is essentially characterized in that the upstream rollers and the downstream rollers are located on either side of the plane formed by the parts of the web located respectively upstream and downstream of the workstation and in that that the rollers, which are driven by an alternating translational movement, are driven simultaneously in the same direction by means of a single support to which they are attached, which support is itself driven by a cam whose contour is adapted to communicate to him the movement of alternative translation.

Thus realized, said device for immobilizing the sheet, which is of simple design, simultaneously drives, in the same direction, in full synchronization, the two rollers.

To do this, the contour of the cam comprises:

a first portion whose profile is defined as a function of the duration of immobilization of the part of the ply situated in front of the workstation (1);

- A second portion whose profile is defined to avoid blows during the passage of said portion of the web from the immobile position to the moving position and vice versa.

PRESENTATION OF FIGURES

The features and advantages of the invention will appear more clearly on reading the detailed description which follows of at least one preferred embodiment thereof given by way of non-limiting example and shown in the accompanying drawings. On these drawings:

FIG. 1 is a schematic view of the device according to the invention;

- Figure 2 is a front view of the cam according to the invention highlighting its different portions; - Figure 3 is a detailed view, in perspective, of the essential parts of the device according to the invention integrated in the workstation of the machine.

DETAILED DESCRIPTION OF THE INVENTION

The device represented in the figures is adapted to be integrated with a machine intended to carry out, at a workstation (1), industrial operations, cutting or gluing types, on webs of complexes (2) running continuously. and intended primarily for the manufacture of respiratory filter masks or hygienic diapers.

Said workstation (1) comprises a device (3) able to immobilize, for a definite time, the part (21) of the complex web (2) located in the operating zone of said station, without modifying the tension of said tablecloth nor the speed of scrolling parts (22) and (23) thereof respectively upstream and downstream of said station.

Said device (3) consists of:

- upstream of the station (1), a first roller (31) for returning the web (2), movable in space, driven by an alternating translational movement (T), associated with two other rollers ( 32) and (33) of said web, fixed in space, respectively located upstream and downstream of the first roller (31), in a plane distinct from that occupied by said first roller;

- Downstream of said station, another first roller (34) for returning the web (2), movable in space, driven by an alternating translational movement (T), associated with two other rollers (35) and (36) returning said web, fixed in space, located respectively upstream and downstream of the first roller (34), in a plane distinct from that occupied by said first roller.

The upstream rollers (31, 32, 33) and the downstream rollers (34, 35, 36) are situated on either side of the plane (P) formed by the portions (22) and (23) of the sheet (2 ) respectively upstream and downstream of the workstation (1).

The rollers (31) and (34), which are driven by an alternating translational movement (T), are driven simultaneously in the same direction by means of a single support (38) to which they are attached, which support is itself driven by a cam (37) whose contour is adapted to communicate the reciprocal translation movement (T).

The connection between the cam (37) and the rollers (31) and (34) is carried out by means of a roller

(39) secured to the support (38). The cam (37) is integral with the fixed support (40) or an extension thereof.

The rollers (32,33,35,36) are fixed to fixed supports (40), in particular of the common platinum type.

The cam (37) is integral with the fixed support (40) or an extension thereof.

The contour of the cam (37) comprises:

- A first portion (371) whose profile is defined according to the duration of immobilization of the portion (21) of the web (2) in front of the work station (1); - A second portion (372) whose profile is defined to avoid blows during the passage of said portion (21) of the web (2) from the stationary position to the moving position and vice versa.

The portion (371) of the cam (37) whose profile is defined as a function of the duration of immobilization of the portion (21) of the ply (2) in front of the workstation (1), is of the ramp type d Archimedes obeying the law R = R ₀ + kα where R is the corresponding ray - AT -

at a given angular position, R ₀ the radius at the beginning of the ramp and α the radius angle R with respect to R ₀ .

The device (3) able to immobilize, for a definite time, the part (21) of the complex web (2) situated in the zone of the workstation (1) can be doubled, or more, by means of:

- A roller (311), movable in space, doubling the first roller (31) and animated by a simultaneous translation movement (T) simultaneously;

- a roller (321), fixed in space, doubling one (32) of the two other rollers (32,33); - A roller (341), movable in space, doubling the first roller (34) and animated by a simultaneous translation movement (T) simultaneously;

- A roller (361), fixed in space, doubling one (36) of the two other rollers (35,36). The rollers (311) and (341) are integral with the movable support (38) or an extension thereof. The rollers (321) and (361) are integral with the fixed support (40) or an extension thereof.

The doubling in question makes it possible to reduce the stroke of the moving assembly by as much or to increase the immobilization time of the strip in front of the workstation. Of course, said elements can be tripled or more if desired. Of course, those skilled in the art will be able to carry out the invention as described and represented by applying and adapting known means.

It may also provide other variants while remaining within the scope thereof as determined by the content of the claims.

Claims

1-machine intended to perform, at a workstation (1), industrial operations, types cutting or gluing, on layers of complexes (2) scrolling continuously and intended for the manufacture of respiratory filter masks or hygienic diapers; said work station (1) comprising a device (3) able to immobilize, for a definite time, the part (21) of the complex web (2) located in the operating zone of said station, without modifying the tension of said web and the speed of travel of the parts (22) and (23) thereof respectively upstream and downstream of said station; said device (3) consisting of:

- upstream of said station, a first roller (31) for returning the web (2), movable in space, driven by an alternating translational movement (T), associated with two other rollers (32) and (33) for returning said sheet, fixed in space, located respectively upstream and downstream of the first roller (31), in a plane distinct from that occupied by said first roller;

- Downstream of said station, another first roller (34) for returning the web (2), movable in space, driven by an alternating translational movement (T), associated with two other rollers (35) and (36) returning said web, fixed in space, located respectively upstream and downstream of the first roller (34), in a plane distinct from that occupied by said first roller; characterized in that the upstream rollers (31, 32,33) and the downstream rollers (34,35,36) are located on either side of the plane (P) formed by the parts (22) and (23) of the web (2) located respectively upstream and downstream of the workstation (1) and in that the rollers (31) and (34), which are driven by an alternating translational movement (T), are driven simultaneously in the same direction by means of a single support (38) to which they are attached, which support is itself driven by a cam (37) whose contour is adapted to communicate the reciprocal translation movement (T).

2- Machine, according to claim 1, characterized in that the contour of the cam (37) comprises: - a first portion (371) whose profile is defined according to the duration of immobilization of the portion (21) of the web (2) in front of the workstation (1);

- A second portion (372) whose profile is defined to avoid blows during the passage of said portion (21) of the web (2) from the stationary position to the moving position and vice versa. 3- Machine, according to claim 2, characterized in that the portion (371) of the cam (37) whose profile is defined according to the duration of immobilization of the portion (21) of the web (2) in front of the workstation (1) is of the Archimedes ramp type obeying the law R = R ₀ + kα where R is the radius corresponding to a given angular position, R _{0 is} the radius at the beginning of the ramp and α is angle of radius R with respect to R ₀ .

4- Machine, according to any one of claims 1 to 3, characterized in that the device (3) adapted to immobilize, for a definite time, the portion (21) of the complex web (2) located in the zone of the work station (1), is doubled by means of: - a roller (311), movable in space, doubling the first roller (31) and animated by a simultaneous reciprocating movement (T);

- a roller (321), fixed in space, doubling one (32) of the two other rollers (32,33);

- A roller (341), movable in space, doubling the first roller (34) and animated by a simultaneous translation movement (T) simultaneously;

- A roller (361), fixed in space, doubling one (36) of the two other rollers (35,36).