WO2009093186A1

WO2009093186A1 - Method and device for generating mail items

Info

Publication number: WO2009093186A1
Application number: PCT/IB2009/050226
Authority: WO
Inventors: Alessandro Prataiola
Original assignee: Kern Sistemi S.R.L.
Priority date: 2008-01-21
Filing date: 2009-01-21
Publication date: 2009-07-30
Also published as: ITRM20080030A1

Abstract

In a method for generating mail items, a first flow of envelope rectangular sheets (B) and a second flow of contents rectangular sheets (C) are generated, which are diverted by a predetermined angle (α), while the contents sheets (C) are rotated by the same angle and the envelope sheets (B) are provided with folding lines (24) slanting by the same angle and then advanced parallel to said folding lines (24).

Description

METHOD AND DEVICE FOR GENERATING MAIL ITEMS

Description

The present invention relates to a method and to a device for generating mail items, made of an envelope, obtained by a sheet, and of contents comprising one or more sheets, envelope and contents deriving by a single flow of sheets, the method comprising folding steps for the manufacturing of said envelope wrapping the contents.

Methods allowing to wrap contents substantially formed by planar elements, such as folded sheets, books, magazines and so on, with wrapping substantially formed by an envelope, are known in the art. hi these, the sheet for forming the wrapping and the one for the contents have different sizes, the sheet for the wrapping being wider in order to completely wrap the contents.

When the latter is formed of folded sheets, e.g. A4 size sheets folded into three even strips by perpendicular folding lines at the long side of the sheet, the sheet used for realizing the wrapping having a size different from A4 and with an wider size.

On the contrary, if the sheet of the wrapping is A4 sized and all the contents are printed or made of A4 size sheets, the latter should be generally trimmed to be wrapped.

This situation correspond to a method wherein the sheets of the wrapping or of the envelope and the one of the contents are printed by a single pile of sheets, from which a flow of sheets is formed and divided into a flow of envelope sheets and a flow of contents sheets, assigned to different folding steps.

In this case, the starting flow could be printed by a single printer.

It is possible to find a similar situation for rectangular sheets, different in size from the A4.

The trimming is generally such that the process is slowed down. Moreover, it requires a very high precision, not always consistent with the required speeds. Moreover, the trimmings should be removed by the flow with the same speed of their production.

In the International application No. WO 2004/089646 it is described a method wherein the envelope sheet, e.g. A4 sized, is rotated relative to the contents sheets which are already folded. The latter are placed on an open envelope sheet in a substantially diagonal position, i.e. such that it is possible for the envelope sheet to completely wrap the contents only by folding it, and providing some closing flaps each corresponding to the corners of the envelope sheet. Nevertheless, this description does not offer any information on how to match envelope sheets and contents in a high speed method.

The technical problem underlying the present invention is to provide a method and a corresponding device capable of high speed producing mail items, from a single sheets flow, without requiring trimming steps.

Such problem is solved by a method as above mentioned, comprising the steps of:

• generating a first flow of envelope sheets and a second flow of contents sheets, placing them on a respective first and second straight path, substantially parallel to a corresponding edge of the envelope sheets and of the contents sheets, respectively, the envelope sheets and the contents sheets being rectangular sheets;

• rotating the contents sheets by a predetermined angle, and diverting their path accordingly, the contents sheets advancing according to a third path also parallel to an edge of the contents sheet;

• providing folding lines in said envelope sheets, determining a rectangular area defined in each envelope sheet and slanting to the edges of the envelope sheet, substantially by an angle corresponding to said predetermined angle, and diverting the path of the envelope sheets substantially by said corresponding angle, advancing the envelope sheets according to a forth path parallel to their folding lines and parallel to said third path;

• placing the contents sheet or sheets internally to an area defined by said folding lines in said envelope sheet; and

• folding the envelope sheet wrapping the contents sheet or sheets, providing a mail item.

According to the same inventive principle, such problem is also solved by a device for generating mail items, comprising:

• a first conveyance line for contents sheets and a second conveyance line for envelope sheets;

• means for rotating the contents sheets by a predetermined angle, said first conveyance line comprising a diversion substantially according to said predetermined angle;

• means for providing folding lines in said envelope sheet, said second conveyance line having a diversion substantially corresponding to the one of the first conveyance line, the blades of the means for providing folding lines being substantially parallel and perpendicular to the diverted conveyance line, said first and second conveyance line being substantially parallel at least downstream of the respective diversions;

• means for matching the contents sheet or sheets and an envelope sheet; and

• means for folding the flaps of the envelope sheet, wrapping the contents sheet or sheets.

The above mentioned method and device thus allows to form both the contents sheets and the envelope sheets from rectangular sheets, in particular and advantageously rectangular sheets of the same size, without the need of trimming and providing the matching thereof easily and directly, assuring a correct positioning of the contents sheets relative to the area defined by the folding lines in the envelope sheet.

In preferred exemplificative embodiments of the present invention, the conveyance lines are completely parallel, thus assuring the parallelism between the first and the second path in the method according to the invention.

Such arrangement is particularly advantageous when the flows of envelope sheets and contents are provided by a single sheets flow serially printed, eventually even by the same printer, and divided into separated flows according to a predetermined setting or by means of the detection of a pointer directly printed on the sheet, before the separation of the flows.

The above mentioned method and device will be hereby described according to a preferred exemplificative embodiment thereof, given by way of a non-limiting example, with reference to the annexed figures, wherein:

* figure 1 is a functional diagram showing the method according to the invention;

* figure 2 is an overall perspective view of a device according to the invention;

* figure 3 is an overall perspective view of the device of figure 2, wherein the carter ha been made transparent so as to show the internal details of the device;

* figure 4 shows a perspective view of a first detail of the device as shown in figure 3;

* figure 5 shows a longitudinal section view of the detail shown in figure 4;

* figure 6 shows a partial perspective view of a second detail of the device as shown in figure 3;

* figures 7, 8 and 9 shows partially sectional perspective views, taken from different angles, respectively, of a third detail of the device as shown in figure 3;

* figure 10 shows a partial perspective view of a forth detail of the device as shown in figure 3.

With reference to the figures, a device for generating mail items is overall shown with the reference number 1. It is fed by one or more printers on a single already printed- sheets flow. According to what is printed on them, the sheets are used as envelope sheet, shown with B, and of contents sheet, shown with C.

In the present example, sheets B, C are provided by the same feeder, not shown, coupled to said printer or printers, not shown. They have the same size and are of the same kind, apart from their function, which is exclusively assigned according to what is printed on them.

They are rectangular sized and possibly of a standard size, e.g. an A4 size.

This printing step, among printing what is referred to the respective sheets, could also print on each sheet an optical code, e.g. an alphanumeric code or a bar code, identifying the function of the sheet and that can be read by a optical reader 2, when the sheets belongs to the same single flow (figure 1) or, alternatively, by more readers.

hi the present example, sheets B, C advance according to a direction parallel to their short side, so as to be more compact. Anyhow, it is intended that they could advance according to a direction parallel to their long side. Such choice could also depend on the orientation according to which the sheets exit the printer. If such orientation is different from the one desired for this first flow portion, a station for the 90° rotation of said sheets could be provided.

Such flow is realized by an inlet conveyance line 3 comprising rollers 4 perpendicular to the direction of the flow and driven according a rotation, so as to drive forward said sheets B, C. Counter-rollers 5 could be also provided for pressing the sheets on the rollers for assuring the adhesion thereof.

According to the reading of the optical reader 2, the flow is divided into two separated flows, one of envelope sheets and one of contents sheets. In the device 1 a dividing station 100 is provided, comprising a switching device 6 having an actuator 7 connected to diverting elements 8 acting on the front edge 9 of each sheet B, C.

According to the previous reading, the front edge 9 is raised, in case of a contents sheet C, or it is lowered, in case of an envelope sheet B, so that the sheet is directed along a respective first or second path, straight and belonging to a correspondent first and second conveyance line, respectively shown with 10 and 20.

If the sheets are not correctly printed or if they are not in the correct position, the reader 2 is not capable of reading the code of the sheet and in such case the switching device raises the edge 9 of advancing the sheet, directing it on a discard conveyance line 30, from which sheets non capable of proceeding the process are discarded. The discard could affect all the sheets belonging to a certain set of envelope-contents sheets, comparing the read codes with the codes in the printing list and providing appropriate discarding stations along the paths of the envelope and contents sheets. Accordingly, the system is also capable of updating the printing list and to send a new printing command to remedy said discarding.

Said conveyance lines 10, 20, are also formed by a rollers carpet, and thus provide a first flow, for the contents sheets C, and a second flow, for the envelope sheets B. Advantageously, the flows flow along parallel and overlapped directions, assuring the maximum compactness. The contents sheets and the envelope sheets have respective short sides parallel to the flow direction, as in the starting flow.

With reference to the conveyance line 10, the contents sheets C advance until a first diversion point 11, and the device 1 comprises a rotation station overall shown with 12. Previous to said station 12, along the conveyance line 10, the sheets C are subjected to a rotation about an axis of theirs perpendicular to the plane defined by them. In other words, the sheets C still lies on the plane onto which the first path rests.

The rotation could be realized by inserting in the conveyance line a pair of longitudinal belts 13, 14 provided between the rollers 5 of the conveyance line 10 and the sheets C.

Such belts 13, 14 acts on opposed ends of the conveyed sheet C, and runs with different speeds therebetween, providing the rotation of the contents sheet C. Each sheet is subjected to the same rotation of a predetermined angle α, and it is placed with its longitudinal axis placed with a slant relative to the motion direction of said first straight path of an angle β complementary to said predetermined angle α.

Accordingly, it is intended that the torque acting altogether on the sheet C could be adjusted acting on the actuators of the belts themselves.

At the diversion point 11, the path of the contents sheets C is diverted substantially complementarily to said predetermined angle α, i.e. substantially equal to 90° - α.

In case of A4 size sheets to be folded crosswise in three equal parts, the amount of the predetermined angle α could be comprise between 20° and 30°, e.g. about 26°, but with size and different folding conditions another angle could be chosen by means of easy tests or geometrical projections.

The contemporaneous effect of the rotation of the contents sheet C and the diversion of the first flow of sheets entails that from the diversion point 11 onwards, the sheets C translates with their side, in particular the long side of the rectangular size, parallel to the motion direction.

Accordingly, the advancing direction is advantageously perpendicular to the folding lines that will be successively provided.

It should be noted that, in the example hereby described, by passing from an arrangement transversal to the motion direction to an arrangement longitudinal to the motion direction, the contents sheet C is actually rotated by said predetermined angle, with the inner belt 14, inner to the diversion of the flow, running faster than the external belt 13.

Obviously, during the diversion, it is possible to always maintain an arrangement longitudinal to the motion direction. Nevertheless, this would require a rotation β = 90° - α, thus likely greater as, in general, α < 45°, and it would be more difficult to control the inertia of the sheet on the external side of the diversion, above all at high speed.

Another possible arrangement always provides the longitudinal advancing of the contents sheets C, and a diversion of the flow equal to α instead of β. In this case the problem of inertia control still remains and moreover the device is less compact, providing a substantially longitudinal extension instead of a sharper diversion of the first flow (i.e. > 45°).

In all these arrangements, it should be notice that the first path of the contents sheets C is diverted as a consequence of the rotation provided to the sheet itself, so as to advance the contents sheets C according to a third path again parallel to a side of the contents sheet, in particular the long side.

The third path could be finally parallel also to the short side of the contents sheet, but in such case it will be more difficult to provide a crosswise folding to the sheet C, unless it is desired an otherwise folded arrangement and/or to provide a further 90° diversion, without rotating the sheets C about said axis.

The belts 13, 14 provides means for rotating the contents sheets of a predetermined angle α, preferably clockwise for a smaller rotation, more compactness and an enhanced inertia control as above described. Anyhow, it is intended that even, alternative means for rotating the contents sheet C, e.g. a conveyance line delimited by flanked rollers and rotating with different speeds, a diverting share, means acting on the upper face of the contents sheet C and so on.

In conclusion, with the diversion of an angle following the predetermined angle α it could be meant a diversion substantially equal to α, β or any other angle determined by the requirements of the folding of the contents and/or envelope sheets.

With reference to the second flow, in second path of the second conveyance line 20 the envelope sheets B could be subjected to a 180° tilting at an apposite tilting station 21 of the device 1.

The possible reason of the tilting could be found in that it is possible that the printing of the envelope and contents sheets B, C is provided on a single side. Supposing that the printed side of the sheets is upper oriented, at the exit of the printing station, also for making the observation and the reading by means of the optical reader 2 easier, and considering that the flow of the envelope sheets B is placed down is placed below the flow of the contents sheets C, it is thus necessary to tilt the sheet B so as its non-printed side, i.e. the blank one, is oriented towards the contents sheets, which will be placed thereon after the processing.

During the continuation of the process, such tilting will allow that folded contents sheets C can easily fall on the side of the envelope sheet B that will provide the internal surface of the envelope to be formed.

Afterwards, the second conveyance line comprises a second diversion point 22 which is substantially overlapped to the first diversion point 11. At the second diversion point 22, the device 1 comprises a creasing machine 23, i.e. means for providing folding lines 24 in said envelope sheet B.

At the same time, the second conveyance line 20 has at the diversion point 22 a diversion of a size substantially corresponding to the one of the first conveyance line 10. In the present example, this diversion is substantially equal to β.

The creasing machine 23 has .blades 25 and corresponding grooves provided on a supporting plate 26 on which a envelope sheet B rests. Moreover, it comprises stopping boards 27 for obtaining a correct positioning of the envelope sheet B.

The blades 25 are associated to a moving element 28 of the creasing machine 23 that alternatively rises and lower itself, provided by an electric motor 29 driven by a positioning sensor, not shown, detecting the presence of an envelope sheet in a corrected position. In the present exemplificative embodiment, blades 25 and their respective grooves 26 are intended for forming four folding lines 24 so as to define a rectangular area D in said envelope sheet B.

Incidentally, it should be noted that the width of such area D could be substantially equal to the cross extension of a contents sheet C and, more in general, such area will be substantially corresponding (or slightly wider) to the area that will be occupied by one or more folded contents sheets C₃ after the enveloping process, hi particular, the area defined by the folding lines 24 will be substantially such that to house a contents sheet folded lengthwise in three equal parts, i.e. with folding lines parallel to the short side and equally spaced, therein. If the above mentioned sheet is A4 sized, the rectangular area on the envelope sheet will be about mm 215 x 100.

In order to obtain this effect, and in particular the one of obtaining an width equal to the cross extension of a contents sheet C, it is necessary that the folding lines 24 are slanting to the edges of the envelope sheet adjacent thereto.

In particular, the position of the blades 25 and of the respective grooves on the respective plate 26 will be such that it will define an angle, between folding lines 24 and respective edges adjacent to the envelope sheet B, substantially equal to α, and the requirement of choosing the angle α according to the sizes of the contents sheets C and of the respective envelope sheet B derives from that.

Thus, considering the diversion of the conveyance line 20 defining a forth path for the envelope sheets B, said folding lines 24 will be substantially parallel and perpendicular to the diverted conveyance line, respectively.

Moreover, said first and second conveyance line 10, 20 will remain substantially parallel along their whole extension, and anyhow at least at the respective second and forth path, i.e. at least downstream of the respective diversions 11, 22.

In conclusion, the flow of the envelope sheets B is diverted by an angle following to said predetermined angle α, which is equal to β in the present example, by advancing the envelope sheets B according to a forth path parallel to a folding lines of its, which, in the present exemplificative embodiment, are the short folding lines, also parallel to said third path of the above-provided contents sheets C.

Moreover it should be noted how the area D moves, from the second diversion point 22 onwards, with its own longitudinal extension placed perpendicular to the motion direction, parallel to the short sides of the above-provided contents sheets C and to the folding lines in the contents sheets C to be formed. As previously said, the creasing machine 23 thus provides means for providing folding lines in said envelope sheet, said second conveyance line having a diversion that substantially correspond to the one of the first conveyance line, the blades provide means for providing folding lines being substantially parallel and perpendicular to the diverted conveyance line, said first and second conveyance line being substantially parallel at least downstream of the respective diversions.

Back to the contents sheets C, the device 1 comprises, on the third path, a first folding station 30 of the contents sheets C.

Such first station 30 is of the so-called pockets type, that can form on the sheet folding lines perpendicular to the advancing direction of the sheets, in the present example perpendicular to the long sides of the sheets.

Such station could be programmed or set to provide a several foldings, differently spaced therebetween, and to give back the folded sheet.

Eventually, such station 30 could be preceded by a unification station 31 wherein contents sheets to be housed in the same envelope could be overlapped.

The unification of the contents sheets is thus realized according to the code printed thereon, read by the reader 2 or by any other reader placed at the unification station.

The sheet (or the sheets) contents C folded in said station are forwarded towards the envelope sheet B.

Afterwards the creasing machine 23, this reaches a second folding station 40 wherein Ie side flaps E₅ F of the envelope sheet, and then the front G and the rear H longitudinal flaps G are respectively folded, according to the advancing direction.

The second station 40 comprised, along said direction, first side shares 41, 42 rising the flap E, F, folding them of about 90°.

Then, the contents sheet or sheets are placed within the area D defined in said envelope sheet by said folding lines 24 at means for matching the contents sheet or sheets and a envelope sheet, wherein the third and forth path meet.

Then, flaps E₅F are definitively folded on the folded contents sheet C.

The device 1 further comprises first means for providing a glue deposition, e.g. a pressure glue of the hot melt kind, sprayed by an apposite nozzle in a portion of longitudinal front flap G directed to be fold on the flaps E₅F. Then, the second station 40 comprises a pocket folding the front flap G on the flaps, activating the pressure glue.

In this step the sheets B and C are by now coupled and the envelope is substantially formed. It remains to close the rear flap H.

Accordingly, the device 1 comprises a third diversion point 50, wherein the envelope and its contents, i.e. the assembly envelope sheet-contents sheet, is 90° diverted, to be send to second means for providing a glue deposition which, e.g., could comprise a nozzle moving perpendicularly to the path of the envelope so as to deposit glue on lines slanting to said path. Such slanting lines could be parallel and adjacent to the edges of the rear flap H.

Subsequently, the device 1 comprises a third folding station 60 with a side share acting on the last flap to be folded and with pressing rollers definitively compressing the by now formed envelope.

The second and the third folding station 40, 60 provides means for folding the flaps of the envelope sheet B wrapping the contents sheet or sheets C.

Finally, the device 1 comprises a collecting station 70 of the envelopes, before they are forwarded to dispatching.

To the above-described device and method for generating mail items a person skilled in the art, in order to satisfy further and contingent needs, could effect several further modifications and variants, all however encompassed in the protective scope of the present invention, as defined by the appended claims.

Claims

1. Method for generating mail items, formed by an envelope, obtained by a sheet, and by contents comprising one or more sheets, comprising the steps of:

• generating a first flow of envelope sheets (B) and a second flow of contents sheets (C), placing them on a respective first and second straight path (20, 10), substantially parallel to a corresponding edge of the envelope sheets (B) and of the contents sheets (C), respectively, the envelope sheets (B) and the contents sheets (C) being rectangular sheets;

• rotating the contents sheets (C) by a predetermined angle (α), and diverting their path accordingly, the contents sheets (C) advancing according to a third path (30) also parallel to an edge of the contents sheet (C);

• providing in said envelope sheets (B) folding lines (24) determining a rectangular area (D) defined in each envelope sheet (B) and slanting to the edges of the envelope sheet (B), substantially by an angle (α) corresponding to said predetermined angle (α), and diverting the path of the envelope sheets (B) substantially by said corresponding angle (α), advancing the envelope sheets (B) according to a forth path (40) parallel to their folding lines (24) and parallel to said third path (30);

• placing the contents sheet or sheets (C) internally to an area (D) defined by said folding lines (24) in said envelope sheet (B); and

• folding the envelope sheet (B), wrapping the contents sheet or sheets (C), providing a mail item.

2. Method according to claim 1, wherein said first flow of envelope sheets (B) and a second flow of contents sheets (C) are provided by a single printed sheets flow.

3. Method according to claim 1 or 2, wherein an optical code identifying the function of the sheet is printed on the sheets (B, C)₅ said optical code being apt to be read by at least an optical reader (2).

4. Method according to claim 1, wherein the sheets (B, C) initially advance according to direction parallel to their short side.

5. Method according to claims 2 and 3, wherein said single sheets flow (B, C) is divided into two flows of envelope sheets (B) and of contents sheets (C), respectively, according to the reading of said at least one optical reader (2).

6. Method according to claim 4, wherein the contents sheets (C) are rotated clockwise and wherein the path of the contents sheets (C) is subjected to a diversion substantially complementary (β = 90° - a) to said predetermined angle (α).

7. Method according to claim 6, wherein the predetermined angle (α) is comprised between 20° and 30°.

8. Method according to claim 7, wherein the contents sheets (C) are A4 sized or similar and wherein said predetermined angle (α) is substantially equal to 26°.

9. Method according to claim 6, wherein, subsequently to a said rotation, the contents sheets (C) translate according to a direction parallel to their long side, perpendicular to the folding lines (24) to be subsequently formed.

10. Method according to claim 1, wherein the envelope sheets (B) are subjected to a 180° tilting.

11. Method according to claim 1, wherein the diversion points (11, 22) of the sheets (B, C) are substantially overlapped.

12. Method according to claim 11, wherein said flows of sheets (B, C) are substantially parallel therebetween.

13. Method according to claim 12, wherein said flows are substantially overlapped.

14. Method according to any of the preceding claim, wherein the contents sheets (C) are placed within the area (D) defined in said envelope sheet (B) and, then, the side flaps (E, F) of the envelope sheets (B) are folded on the contents sheet (C) and then a front flap (G) of the envelope sheet B) is folded on the flaps (E, F) after a glue deposition.

15. Method according to claim 14, wherein the mail item, after the folding of the front flap (G), is 90° diverted, then the rear flap (H) is folded on the front flap (G) dopo after a glue deposition.

16. Device (1) for generating mail items, comprising:

• a first conveyance line (10) for contents sheets (C) and a second conveyance line (20) for envelope sheets (B);

• means for rotating (13, 14) the contents sheets (C) by a predetermined angle (α), said first conveyance line (10) comprising a diversion substantially according to said predetermined angle (α); • means for providing folding lines (23) in said envelope sheet (B), said second conveyance line (20) having a diversion corresponding substantially to the one of the first conveyance line (10), the blades (25) of the means for providing folding lines (24) being substantially parallel and perpendicular to the diverted conveyance line, said first and second conveyance line (10, 20) being substantially parallel at least downstream the respective diversions;

• means for matching the contents sheet or sheets (C) and a envelope sheet (B); and

• means for folding (40, 60) the flaps (E, F, G, H) of the envelope sheet (B), wrapping the contents sheet or sheets (C).

17. Device (1) according to claim 16, comprising a common feeder linked to one or more printers.

18. Device (1) according to claim 16 or 17, comprising at least one optical reader (2).

19. Device (1) according to claim 17, comprising a dividing station (100) with a switching device (6) having an actuator (7) connected to diverting elements (8) acting on each sheet (B, C).

20. Device (1) according to claim 19, wherein the dividing station (100) comprises a discard conveyance line (30).

21. Device (1) according to any of claims 16 to 20, comprising a rotation station (12) having a pair of longitudinal belts (13, 14) acting on opposed ends of the conveyed contents sheet (C), and runs with speeds different therebetween, providing the rotation of the contents sheet (C).

22. Device (1) according to any of claims 16 a 21, comprising a tilting station (21) on the flow of the envelope sheets (B)

23. Device (1) according to claim 16, wherein the means for providing folding lines comprises a creasing machine (23) at a diversion point (22) of the second conveyance line (20).

24. Device (1) according to claim 23, wherein the creasing machine (23) has blades (25) and corresponding grooves provided on a supporting plate (26) onto which an envelope sheet (B) rests, and stopping boards (27) for providing a correct positioning of the envelope sheet (B), the blades (25) being directed to form four folding lines (24) such as to define a rectangular area (D) in said envelope sheet (B).

25. Device (1) according to claim 24, wherein the positioning of the blades (25) and of the respective grooves on the respective plate (26) is such that to define a predetermined angle (α), between folding lines (24) and respective edges adjacent to the envelope sheet (B), said folding lines (24) being substantially parallel and perpendicular, respectively, to the diverted conveyance line (20).

26. Device 81) according to claim 16, comprising a first folding station (30) of the contents sheets (C) of the so-called pockets type, that is apt to provide on the sheet folding lines perpendicular to the advancing direction of the sheets, i.e. perpendicular to the long sides of the sheets.

27. Device (1) according to claim 26, wherein said folding station (30) is preceded by a unification station (31) wherein contents sheets (C) to be received in the same envelope are overlapped.

28. Device (1) according to claim 16, wherein the means for folding (40, 60) the flaps (E, F₅ G, H) comprises a folding station (40) wherein side flaps (E, F) of the envelope sheet (B) are folded by side shares (41, 42) rising the flaps (E, F), respectively, rotating them by about 90°, and wherein the flaps (E, F) are then definitively folded on the folded contents sheet (C).

29. Device (1) according to claim 28, comprising means for providing a glue deposition at said folding station (40), in a portion of rear longitudinal flap (G) apt to be folded on the flaps (E, F), the folding station (40) thus comprising a pocket folding the front flap (G) on the flaps (E, F), activating the pressure glue.

30. Device (1) according to claim 29, comprising a third diversion point (50) wherein the assembly envelope sheet-contents sheet is 90° diverted to be sent to second means for providing a glue deposition comprising a nozzle moving perpendicularly to the path of the assembly so as to deposit glue on lines slanting to said path, parallel and adjacent to edges of the rear flap (H).