MACHINE AND METHOD FOR PRODUCING PACKAGES OF FOLDED OR INTERFOLDED LAMINAR PRODUCTS MADE OF PAPER, IN PARTICULAR PACKAGES OF NAPKINS, TISSUES, TOWELS, OR SIMILAR PRODUCTS

Abstract

A machine for producing packages of folded or interfolded laminar products made of paper, in particular packages of napkins, tissues, towels, or similar products, comprising a folding or interfolding group, equipped with a first and a second folding or interfolding roll configured to fold or interfold a plurality of sheets of paper, and to obtain a stack of folded or interfolded sheets, according to a predetermined folding or interfolding configuration, which grows in height along a vertical forming direction. The machine comprises, furthermore, a separation group configured to separate a completed stack of folded or interfolded sheets, once that a predetermined height of said stack being formed is reached, from a following stack being formed. A transfer group is, furthermore, provided configured to transfer the completed stack on a discharge device configured to discharge the completed stack from the machine.

Claims

1. A machine for producing packages of folded or interfolded laminar products made of paper, in particular packages of napkins, tissues, towels, or similar products, said machine comprising: a folding or interfolding group equipped with a first and a second folding or interfolding roll configured to fold or interfold a plurality of sheets of paper, and to obtain a stack of folded or interfolded sheets according to a predetermined folding or interfolding configuration arranged to grow in height along a vertical forming direction; a separation group configured to separate a completed stack of folded or interfolded sheets, once that a predetermined height of said stack being formed is reached, from a following stack being formed positioned upstream of said completed stack along said vertical forming direction, said separation group comprising a first and a second separator member arranged to enter into said stack being formed from opposite sides to separate said completed stack from said following stack being formed; a transfer group configured to transfer said completed stack on a discharge device configured to discharge said completed stack from said machine; a displacement device operatively connected to said discharge device and configured to move said discharge device along a displacement direction towards/from said transfer group.

2. The machine according to claim 1, wherein said first separator member and said second separator member are arranged to support together said completed stack up to a predetermined first height (q1).

3. The machine according to claim 2, wherein said transfer group is arranged to move from a position external to said stack and a support position at a height (q1) higher than said first height (q1) whereby said separation group and said transfer group are arranged to support together said stack being formed between said height (q1) and said first height (q1).

4. The machine according to claim 2, wherein said transfer group is arranged to support said stack being formed between said first height (q1) and a second height (q2), with said second height (q2) less than said first height (q1).

5. The machine according to claim 4, wherein at said second height (q2) said transfer group is arranged to position said completed stack on said discharge device.

6. The machine according to claim 4, wherein said displacement device is configured to move said discharge device along said displacement direction, during said transfer group is moved from a predetermined third height (q3) less than said predetermined second height (q2) up to said predetermined second height (q2) at which said transfer group is arranged to discharge said completed stack on said discharge device and wherein said displacement device is, then, arranged to move said discharge device to move the same from said predetermined second height (q2) to said predetermined third height (q3) at which said discharge device is arranged to discharge said completed stack from the machine.

7. The machine according to claim 4, wherein said displacement device is configured to position said discharge device at said predetermined second height (q2) before starting a working cycle, i.e. before said transfer group starts to move with said stack positioned on the same, said discharge device being arranged to remain at said predetermined second height (q2) during a working cycle at which is arranged to discharge said completed stack.

8. The machine according to claim 1, wherein said displacement device comprises at least a transmission belt operated by a motor group (66) to move along a vertical direction parallel to the aforementioned vertical forming direction.

9. The machine according to claim 1, wherein said discharge device is configured to move along a discharge direction to cause said completed stack to move away from said vertical forming direction.

10. The machine according to claim 1, wherein said transfer group comprises a first and a second support member configured to move from opposite sides with respect to said vertical forming direction between a position external to said stack being formed and a respective support position, where they are arranged to support respective portions of said stack being formed from opposite sides with respect to said vertical forming direction.

11. The machine according to claim 10, wherein said first and second support members are configured to move independently from each other along a vertical direction and along a horizontal direction.

12. The machine according to claim 10, wherein said first support member, before that said second support member is arranged to be positioned at said support position, is configured to move along a direction transversal to said stack being formed up to exceed said respective support position in such a way to stretch at least a portion of said stack being formed exiting said first and second separator members, said first support member being, then, arranged to withdraw up to be positioned at said respective support position to support said stack being formed together with said second support member.

13. The machine according to claim 10, wherein said second support member is arranged to be positioned at said respective support position of said stack being formed after that said first support member has stretched said at least a portion of said stack being formed to support said stack being formed together with said first support member.

14. The machine according to claim 2, wherein a control group is, furthermore, provided configured to compute said first height (q1) and/or said second height (q2) and/or said third height (q3) according to the height, or the type of product to be produced.

15. Method for producing packages of folded or interfolded laminar products made of paper, in particular packages of napkins, tissues, towels, or similar products, said method comprising the steps of: folding or interfolding, by a folding or interfolding group, equipped with a first and a second folding or interfolding roll a plurality of sheets to form a stack of folded or interfolded sheets according to a predetermined folding or interfolding configuration arranged to grow in height along a vertical forming direction; separating a completed stack of folded or interfolded sheets once that a predetermined height of said stack being formed is reached, from a following stack being formed positioned upstream of said completed stack along said vertical forming direction, said separating step being carried out by a first and a second separator member arranged to enter into said stack being formed from opposite sides to separate said completed stack from said following stack being formed, said first and second separator members being arranged to support together said stack being formed; transferring by a transfer group said completed stack on a discharge device configured to discharge said completed stack from said machine; discharging by a discharge device said completed stack from said machine; said method being characterized in that a moving step is, furthermore, provided for moving by a displacement device said discharge device along a displacement direction towards/from said transfer group.

16. The machine according to claim 3, wherein said transfer group is arranged to support said stack being formed between said first height (q1) and a second height (q2), with said second height (q2) less than said first height (q1).

17. The machine according to claim 5, wherein said displacement device is configured to move said discharge device along said displacement direction, during said transfer group is moved from a predetermined third height (q3) less than said predetermined second height (q2) up to said predetermined second height (92) at which said transfer group is arranged to discharge said completed stack on said discharge device and wherein said displacement device is, then, arranged to move said discharge device to move the same from said predetermined second height (q2) to said predetermined third height at which said discharge device is arranged to discharge said completed stack from the machine.

18. The machine according to claim 5, wherein said displacement device is configured to position said discharge device at said predetermined second height (q2) before starting a working cycle, i.e. before said transfer group starts to move with said stack positioned on the same, said discharge device being arranged to remain at said predetermined second height (q2) during a working cycle at which is arranged to discharge said completed stack.

19. The machine according to claim 11, wherein said first support member, before that said second support member is arranged to be positioned at said support position, is configured to move along a direction transversal to said stack being formed up to exceed said respective support position in such a way to stretch at least a portion of said stack being formed exiting said first and second separator members, said first support member being, then, arranged to withdraw up to be positioned at said respective support position to support said stack being formed together with said second support member.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The invention will now be shown with the following description of its exemplary embodiments, exemplifying but not limitative, with reference to the attached drawings in which:

[0046] Figures from 1 to 9B diagrammatically show a front view of some possible steps carried out by a first embodiment of a machine, according to the invention, for producing packages of laminar products made of paper, in particular packages of napkins;

[0047] FIGS. 10 and 11 diagrammatically show a front view of a possible alternative embodiment of the machine of FIG. 1;

[0048] FIGS. 12 and 13 diagrammatically show a front view of other possible alternative embodiments of the machine of FIG. 1 foreseen by the invention;

[0049] FIG. 14 diagrammatically shows a plan view of a possible embodiment of a discharge device of packages of products obtained by one of the embodiments of the machine that are shown in the FIGS. 1 to 13.

DETAILED DESCRIPTION OF SOME EXEMPLARY EMBODIMENTS OF THE INVENTION

[0050] With reference to the FIGS. from 1 to 9B, a machine for producing packages of folded or interfolded laminar products made of paper, in particular packages of napkins, tissues, towels, or similar products, comprises a folding or interfolding group 10 equipped with a first and a second folding or interfolding roll 11a and 11b configured to fold or interfold a plurality of sheets of paper and to form a stack 50 of folded or interfolded sheets according to a predetermined folding or interfolding configuration. The stack 50 grows in height along a forming direction 150, in particular a vertical forming direction, up to obtain a completed stack 50a having a predetermined height H, or a predetermined number of sheets. More in detail, when the stack being formed 50 reaches the aforementioned height H, a separation group 20 divides the completed stack 50a of folded or interfolded sheets, so obtained, from a following stack being formed 50 positioned upstream of the completed stack 50a along the forming direction 150. In particular, the separation group 20 can comprise a first and a second separator member 21a and 21b arranged to enter into the stack being formed 50 from opposite sides to separate, as anticipated above, the completed stack 50a from the following stack being formed 50. In particular, the first and second separator members 21a and 21b can be configured to support together the completed stack 50a. More in particular, the first and second separator members 21a and 21b are configured to support together the completed stack 50a up to a predetermined first height q1 (see FIGS. 9A and 9B). The first and second separator members 21a and 21b, once they exit the stack 50a supported by the transfer group 30, are arranged to separate the stack 50a now completed from the following stack being formed 50 entering the same from opposite sides as described above to go on with the working cycle.

[0051] A transfer group 30 is, furthermore, provided configured to transfer the completed stack 50a on a discharge device 40, for example of movable type, such as a conveyor belt, or a chute, advantageously arranged to discharge the completed stack 50a from the machine. More in detail, the transfer group 30 is arranged to move the stack being formed 50 and, therefore, the completed stack 50a along a transfer direction 130, which, advantageously, coincides with the aforementioned vertical forming direction 150.

[0052] In particular, as diagrammatically shown as an example in the alternative embodiment that is shown in FIGS. 5 to 8, the transfer group 30 is arranged to be positioned from a position external to the stack being formed 50 to a support position at which is arranged to support the stack being formed 50 same together to the separation group 20. More precisely, the transfer group 30 is arranged to move from the position external to the support position, advantageously at a height q1 slightly higher than the first height q1 (see FIGS. 9A and 9B), at which the separation group 20 is arranged to exit the stack 50a being formed. Therefore, for a short stretch comprised between the height q1 and the first height q1 (FIG. 9B), the separation group 20 and the transfer group 30 support together the stack 50 being formed. The transfer group 30 is arranged to assist the growth in height of the stack being formed 50, in particular moving along the vertical direction at a determined speed, and, then, to transfer, accelerating, the completed stack 50a and discharging the same on the discharge device 40 at a second height q2, less than the first height q1, once that a predetermined height of the stack being formed 50 is reached. As a skilled person in the art will have no difficulty to understand, in the FIGS. 1 to 9B, the heights q1, q1, q2 and q3 are indicated approximately.

[0053] According to the present invention, a displacement device 60 is, furthermore, provided operatively connected to the aforementioned discharge device 40 and configured to move the discharge device 40 along a displacement direction 160 towards/from the transfer group 30. For example, the discharge device 40 can be engaged at least at a side 41 to the aforementioned displacement device 60, in particular by an engagement device 45.

[0054] In a first embodiment foreseen, the displacement device 60 can be configured to move the discharge device 40 along the aforementioned displacement direction 160 during a working cycle, i.e. during the motion of the transfer group 30 with the stack of sheets positioned on it. In particular, in this case, the displacement device 60 is arranged to move the discharge device 40 from a third height q3 less than the second height q2 up to the second height q2 at which the transfer group 30 is arranged to discharge the completed stack 50a on the discharge device 40. The displacement device 60 is, then, arranged to move the discharge device 40 in the direction opposite to the previous one to move it from the second height q2 to the third height q3 at which the discharge device 40 is arranged to discharge the completed stack 50a outside the machine. The sequence described above is, then, repeated for all the production cycle of the machine as described above.

[0055] In this way, it is possible to reduce the stroke of the transfer group 30 with respect to the prior art solutions obtaining a great energy conservation and is, thus furthermore, possible to increase the productivity of the machine and, therefore, to optimize the cycle of the machine for transferring and discharging the completed stack 50a.

[0056] As diagrammatically shown for example in FIG. 1, the displacement device 60 can comprise at least a transmission belt 65 operated by a motor group 66 to move along the displacement direction 160 towards the, or from the transfer group 30. The displacement device 60 can comprise at least one actuator, of hydraulic, electric, or pneumatic type, or a motor coupled to a motion transmission device for example a rack and pinion, or other devices able to cause a movement of the discharge device 40 towards/from the transfer group 30. In particular, as diagrammatically shown in FIG. 14, the discharge device 40 is configured to cause the completed stack 50a to move along a discharge direction 140, in particular orthogonal to the displacement direction 160, to cause the completed stack 50a to move away from the forming direction 150. For example, the discharge device 40 can be a conveyor belt operated by a motor.

[0057] As diagrammatically shown in the example of FIGS. 1 to 9B, the transfer group 30 can, for example comprise a first and a second support member 31a and 31b configured to move from opposite sides with respect to the vertical forming direction 150 between a position external to the stack being formed 50 (see for example FIGS. 3, 4 and 5) and a respective support position (see FIGS. 1 and 9A), where they are arranged to support respective portions of the stack being formed 50 from opposite sides with respect to the vertical forming direction 150. Advantageously, the first and second support members 31a and 31b are configured to move independently from each other along a vertical direction and along a horizontal direction. In this way, it is possible to carry out the operations described in the following, as an example, with reference to the FIGS. 5 to 9B. In particular, the first support member 31a, before that the second support member 31b is positioned at the respective support position, can be configured to move along a direction transversal to the stack being formed 50, in particular below the separation group 20, exceeding the respective support position, advantageously running substantially all the width of the stack being formed 50, to stretch at least a portion 51, for example a first and a second portion 51a and 51b, of the stack being formed 50 protruding from the first and second separators 21a and 21b (FIGS. 5 and 6). The first support member 31a can be, then, arranged to withdraw up to be positioned at the respective support position to support the stack being formed together with the second support member 31b.

[0058] Advantageously, before that the first support member 31a is arranged to withdraw to be positioned in the respective support position, the second support member 31b can be arranged to be positioned below the first support member 31a to press a portion of the, or each, portion 51 protruding from the first support member 31a (FIG. 7). Then, the first support member 31a is arranged to withdraw to be positioned in the respective support position and the second support member 31b is arranged to be positioned at the same, or substantially the same, height of the first support member 31a to support together the stack being formed 50 (FIGS. 8 and 9A).

[0059] The inlet movement of the first support member 31a to be positioned at the support position for supporting the stack being formed, comprising also the movement for stretching at least the portion 51, and the inlet movement of the second support member 31b to support the stack being formed together with the first support member 31a is, advantageously, about comprised between the height q1 and the height q1 (see the sequence shown from FIG. 6 to FIG. 9A).

[0060] As diagrammatically shown only in FIG. 1 for clarity reasons, a detaching group 80 is, furthermore, advantageously, provided comprising a first plurality of detaching members 85a, or detaching fingers, and a second plurality of detaching members 85b, or detaching fingers configured to act, respectively, at the first and the second folding or interfolding rolls 11a and 11b to detach the sheets 105 from the external lateral surface 12 of the respective folding or interfolding roll, 11a, or 11b.

[0061] As diagrammatically shown in the FIGS. 10 and 11, the displacement device 60 can be configured to position the discharge device 40 at the second height q2 before starting a production cycle. In particular, the second height q2 can be selected from a plurality of suitable second heights q2, for example at least a first height q2 and a second height q2. For example, the height q2 can be computed according to the type of product to be produced, that means according to the number of sheets of which the completed stack 50a is formed, and, in general, according to the height of the completed stack 50a. In this case, during a working cycle, the discharge device 40 can be arranged to remain at the second height q2 at which is arranged to discharge the completed stack 50a thus causing a movement of the same along the aforementioned discharge direction 140. The other steps of the process are substantially the same described above with reference to the previous case (FIGS. 1 to 9B) with the difference that during a working cycle, the discharge device 40 stays at the aforementioned height q2 once that has been set.

[0062] This solution allows, in particular, to modify the machine equipped with the folding or interfolding unit described above to produce products of different size, in particular packages of folded or interfolded sheets of paper having different heights and, therefore, makes the machine highly flexible.

[0063] In particular, a control group 300 can be provided as diagrammatically shown in FIG. 12, configured to adjust and control the stroke of the transfer group 30, in particular to set the height q2 at which is arranged to discharge the completed stack 50a on the discharge device 40. More in particular, the height q2 at which the end of the stroke of the transfer group 30 is set, corresponds to the height q2 at which the discharge device 40 is positioned in the preliminary step. The adjustment group 300 can comprise a computer, a PLC or any other electronic device that is able to compute the height q1 and/or the height q2 and/or the height q3 and/or the height q1 and/or the height q2 according to the type of product, and more in particular according to the height of the product. In practice, the control group 300 computes the height of the product according to the folding configuration of the sheets, for example L, V, M, W, and to the number of the sheets forming a completed stack that an operator can set or select by a graphic interface or by a remote connection. The control group 300 for computing the height of the completed stack can also use, as further data, the paper weight. In this way, the heights q1, q2 and q3 are computed in an optimized way to reduce the strokes of the separation group 20, of the transfer group 30 and, if foreseen, of the type of machine cycle, of the discharge device 40.

[0064] In a further embodiment according to the invention that is not shown in the figures for simplicity, the possibility is also provided that the displacement device 60 is associated to a supplementary adjustment device that is not shown in the figure for simplicity, configured to set the height q2 of the discharge device 40 and to move, then, during a working cycle, the discharge device 40 towards and from the transfer group 30 between the height q2 so set by the aforementioned supplementary adjustment device and the height q3 at which the discharge device 40 is arranged to discharge the completed stack 50a of the machine, analogously to what described above with reference to the FIGS. 1 to 9B.

[0065] The foregoing description exemplary embodiments of the invention will so fully reveal the invention according to the conceptual point of view, so that others, by applying current knowledge, will be able to modify and/or adapt for such embodiment without further various applications research and without parting from the invention, and, accordingly, it is therefore to be understood that such adaptations and modifications will have to be considered as equivalent to the specific embodiments. The means and the materials to realize the different functions described herein could have a different nature without, for this reason, departing from the field of the invention. It is to be understood that the phraseology or terminology that is employed herein is for the purpose of description and not of limitation.