Transversal cutting equipment for sheets separable from overlapped continuous forms

Cutting equipment (41) which processes overlapped continuous forms (23H, 23L) is disclosed. The cutting is carried out by means of a cutting device (29), which separates the sheets from the forms, introduction devices (28H and 28L), which enter the continuous forms (23H, 23L) into the cutting device and a singularizing device (46) for overlapped sheets, which includes two transport paths (81 and 82), the one above the other, with differentiable transfer times; the singularizing device comprises a diverter (83) upstream of the transport paths (81 and 82); the introduction devices (28H and 28L) are actuatable for temporarily projecting a leading edge of one of the overlapped forms (23H, 23L) with respect to the other form up to a switching zone of the diverter (83), or for advancing together the overlapped forms (23H, 23L); the diverter (83) is configurable for addressing a continuous form or both forms (23H, 23L) to one or to both transport paths (81 and 82); and the introduction devices (28H and 28L) are also actuatable, in the case of projecting of one of the continuous forms, for lining up trailing edges of the sheets of the one and the other form for a joint cutting of the overlapped forms (23H, 23L) by means of the cutting device (29).

RELATED APPLICATION

This application claims priority to Italian Application No. TO2013A000344 filed Apr. 26, 2013, and entitled “Improvements to a transversal cutting equipment for sheets separable from overlapped continuous forms”, the content of which is incorporated herein by reference in its entirety.

FIELD

The present invention relates to improvements to a transversal cutting equipment for sheets separable from overlapped continuous forms.

More specifically, the invention relates to improvements to a transversal cutting equipment for sheets separable from overlapped continuous forms, comprising a cutting device for the joint transversal separation of the sheets, introduction devices for entering the forms into the cutting device and a singularizing device for the overlapped sheets including two transport paths, the one above the other, with differentiable transfer times.

BACKGROUND

Equipments of this type, commercially known as double cutters, are used in systems for automatic processing documents, which have been previously printed on continuous forms.

The double cutters can operate, “on-line”, downstream from longitudinally cutting equipment, known as “merger” that divide the basic continuous forms in a longitudinal direction.

The double cutters of known type drive forward the continuous forms simultaneously or alternately and provide to separate, by means of a single blade, the printed sheets singularly or overlapped for the formation of the documents and following processings. For reason of cost and operational flexibility, cutting devices with alternative movements, for instance with guillotine blades, are used which require the stopping of the continuous form at the time of the cutting.

The operating velocity of the cutters on the market is conditioned by the velocity of the cutting device and the stresses to which are subjected the continuous forms entering in the equipment. Particularly good results have been obtained with the cutting equipment of the Italian Patent No. 1,360,399 in the name of Tecnau S.r.l. That equipment provides additional loops upstream of the cutting device and averaged velocities of the continuous forms at the inputs of the equipment. This allowed to reach the limit determined by the cutting device for the separation of the overlapping sheets. However, the overall productivity is lower than the theoretical productivity, when one of the continuous forms should be arrested for the production of documents with an odd number of sheets or for particular arrangements of the documents in undivided form. Further, the different velocities of the continuous forms, after the longitudinal separation by the “merger”, makes more difficult the standardization of the velocity of the continuous forms at the input of the equipment.

A transversal cutting equipment for sheets separable from overlapped continuous forms is the subject of the Italian Patent IT 1.397.442, also in the name of Tecnau S.r.l: The equipment of IT 1.397.442 comprises a cutting device, which can be activated for the simultaneous separation of the sheets from the continuous forms and a singularizing device of overlapped sheets for solving problems concerning documents with an odd number of sheets. In a specific embodiment, the singularizing device comprises a separating mechanism of the overlapped forms, having suction rollers downstream of the cutting device, two transport paths lying one above the other downstream of the suction rollers and an accumulating and forwarding device. The cutting device operates in continuous mode on the overlapped forms, while the transport paths can transport the sheets with differentiated velocities. This allows that a cut sheet of a following document, other than the document in formation, is transferred to the accumulating and forwarding device for the formation of the new document, substantially after the forwarding of the previous document. The devices achieved in accordance with this patent are fast, even in the case of documents having a reduced and odd number of sheets, but result quite expensive.

BRIEF SUMMARY

An object of the present invention is to provide an equipment for transversal cutting and intermittent motion for continuous overlapped forms, of high reliability and velocity, which operates on overlapped continuous forms and which results of relatively low cost.

In accordance with this object, the equipment for transversal cutting of the invention comprises, as singularizing device, a diverter upstream of the transport paths and wherein the introduction devices are actuatable for temporarily projecting a leading edge of one of the overlapped forms with respect to the other form up to a switching zone of the diverter, or for advancing together the overlapped forms. The diverter is configurable for addressing a form or both forms to one or to both transport paths and the introduction devices are also actuatable, in the case of projecting of one of the forms, for lining up the trailing edges of the one and the other form for a joint cutting of the overlapped forms by means of the cutting device.

Another object of the invention is to provide a method for transversal cutting sheets separable from continuous overlapped forms, using a cutting equipment, comprising a cutting device for the joint transversal separation of the sheets; introduction devices for entering the forms into the cutting device and a singularizing device for the overlapped sheets including two transport paths, the one above the other, with differentiable transfer times. The cutting equipment further comprises as singularizing device a diverter upstream of the transport paths and wherein said method provides the following steps:

a) actuating the introduction devices for temporarily projecting a leading edge of one of the overlapped forms with respect to the other form up to a switching zone of the diverter, or for advancing together the overlapped forms;

b) configuring the diverter for addressing a form or both forms to one or to both transport paths; and

c) actuating the introduction devices, in the case of projecting of one of the forms, for lining up the trailing edges of the one and the other form for a joint cutting of the overlapped forms by means of the cutting device.

DETAILED DESCRIPTION

FIG. 1shows a cutting equipment21with a double cutter22for continuous overlapped forms23H and23L. The continuous forms23H and23L are derived, by longitudinal cutting, from a paper tape or continuous base form24(seeFIG. 2), with advancement along a direction “F”. The cutting equipment21is specifically of the type described in the cited Italian Patent No. 1,360,399, the content of which is an integral part of the present description.

In summary, the double cutter22comprises input feeding devices26H and26L, loop forming devices27H and27L, introduction devices28L and28H, a guillotine cutting device29and an extraction and trimming device31.

The equipment21provides, in particular, a singularizing device for the overlapped sheets, which comprises a separation mechanism32of the overlapped continuous forms23H and23L, downstream of the cutting device29, transport paths33H and33L at different heights, an accumulating and forwarding device or output buffer34and differentiating means36for modifying the transport times of the sheets separated from the continuous forms along the transport paths33H and33L. The cutting of the sheets is performed on the overlapped continuous forms, while the separation mechanism32includes suction rollers37for separating and spacing away the sheets after cutting and directing the sheets towards the transport paths33H and33L. An electronic unit38controls the kinematic components of the equipment21and, in particular, the respective singularizing device for the overlapped sheets.

The cutting equipment21is part of a system that receives sheets printed on continuous forms24and in which the separated sheets constitute the pages of various documents. In accordance with current standards, the pages belonging to a given document and the various documents are printed on the continuous base form24on columns arranged side by side and according to a predetermined regressive order (SeeFIG. 2) or progressive order.

The cutting device29operates on the overlapped continuous forms23H and23L, while the equipment21handles a loss of parity of the overlapped forms by modifying the transfer times of the sheets along the transport paths33H and33L. In particular, the differentiating means36is actuatable for stopping or slowing a cut sheet of a following document, different from the current document in formation, while the sheet of the current document is transferring to the output buffer34by completing the forming of the document.

A transversal cutting equipment41for sheets separable from continuous forms23H,23L, in accordance with the invention is shown inFIG. 3. The equipment41comprises a double cutter42, similar to the double cutter22ofFIG. 1and, with same numbering, the input feeding devices26H and26L, the loop-forming devices27L and27H, the introduction devices28H and28L, and the cutting device29.

Specifically, the equipment41comprises an extraction and trimming device44for extracting and trimming the sheets from the cutting device29, a singularizing device46for the overlapped sheets, and an accumulating and forwarding device or output buffer47for a document. An electronic unit48controls the introduction devices28H and28L, the cutting device29, the extraction and trimming device44, the singularizing device46and the output buffer47.

The introduction devices28H and28L are provided for introducing the continuous forms23H and23L into the cutting device29in a high-low overlapping condition and comprise respective feeding rollers51and52(FIG. 4) and pinch rollers for the taken of the continuous forms and driving motors53and54. On control of the electronic unit48, the motors53and54drive the rollers51and52for a positive feeding of the continuous forms23H and23L through the cutting device29.

The cutting device29comprises guides for the overlapped continuous forms23H and23L, a guillotine blade56and a counter blade57which define a transversal cutting surface for the forms23H and23L. A motor58, controlled by the electronic unit48, actuates the blade56via a, not shown, cam mechanism.

The extraction and trimming device44is actuated by a motor59and is provided for extracting, by friction and possibility of sliding, the overlapped continuous forms23H and23L emerging from the cutting device29independently from each other. To this end, for the extraction of the forms23H, the device29comprises upper feeding rollers61aand61b(FIG. 5) and lower pinch rollers62aand62b. For the forms23L, the device44comprises lower feeding rollers63aand63band upper pinch rollers64aand64b. The feeding rollers61aand61b, and63aand63bare keyed on respective shafts65and66and in which the shaft66is driven by the motor59. In turn, the shaft65is rotated by the shaft66, in a condition of synchronism, through a pair of gears67, while the pinch rollers62aand62band64aand64bare idle mounted on respective bridge members, which are spring pushed against the feeding rollers61aand61band62aand62b.

Suitably, the extraction and trimming device44comprises a frame68, of rotatable support for the shafts65and66, and two trimming groups69and71. The groups69and71are, for example, rotating blades driven by the shafts65and66and provide to a side trimming of the forms23H and23L. Guides72are also provided for outputting the continuous forms and which define a geometric reference surface74, substantially horizontal, passing through the guides of the cutting device29.

In particular, the feeding rollers63aand63band the pinch rollers64aand64bare provided for engaging the continuous forms on the reference surface74, transversely to the direction of advancement of the continuous forms, in a staggered manner with respect to the feeding rollers61aand61band the respective pinch rollers62aand62b. The peripheral velocity of the feeding rollers is greater than the maximum velocity of the introduction devices28H and28L to ensure an extraction of the sheets devoid of jamming, according to a known technique.

According to the invention, the singularizing device46(FIG. 3) comprises transport paths81and82arranged, respectively, above and below the reference surface74and having differentiable transfer times, and a diverter83upstream of the transport paths81and82. Specifically, the diverter83is interposed between the extraction and trimming device44and the transport paths81and82and is configurable to address a continuous form or the two forms23H and23L from the cutting device29through the extraction and trimming device44to one or both transport paths81and82.

The electronic unit48controls the input devices28H and28L for making a leading edge of one of the continuous forms23H and23L, at the output from the extraction and trimming device44to temporarily overtake the edge of the underlying or overlying form with projection up to a switching zone SWZ of the diverter83. The introduction devices28H and28L are also actuatable for operating on the two continuous forms so as to align the trailing edges of the one and of the other form23H and23L, after the overtaking of one of the forms, for a joint cutting of the overlapped forms by the cutting device29.

The diverter83(FIG. 4a) can be positioned according to three different configurations: a first configuration “C1”, provides the output of the cutting device29to be connected with one of the two transport paths81and82, a second configuration “C2” provides the connection with the other transport path and a reference configuration “RC” allows the separated transport of the continuous forms23H and23L along the two transport paths81and82.

In detail, the diverter83(FIG. 4) comprises a switch wedge86extending transversely across the width of the continuous forms23H and23L, with a front edge facing the guides72of the extraction and trimming device44and upper and lower guiding sides. The front edge of the switch edge86defines the switching zone SWZ (FIG. 4a) of the diverter83and the guiding sides are, respectively, inclined upward and downward and have function of guide for the forms23H and23L. The wedge86can rotate, with the change of configuration, by means of a transversal shaft89, among a rest central position for the reference configuration “RC” and two inclined positions, respectively downward (FIG. 6b) and upward (FIG. 6a), associated, respectively, to the first configuration “C1” and the second configuration “C2”.

The diverter83is actuated by a motor89(FIGS. 2 and 4), for example a high speed stepping motor, with positions controlled by the electronic unit48. The transmission of the motion for the inclination of the wedge86is carried out in any known way, as via a belt-pulley coupling.

In the central position of the reference configuration “RC”, the switch wedge86(FIG. 4a) has the front edge lying on the reference plane74and defines with the guiding sides access paths for the transport paths81and82. In the configuration “C1”, the upper guide side defines the access to the upper transport path81while, in the configuration “C2”, the lower guide side defines the access to the lower transport path82.

Conveniently, the cutting equipment41(FIGS. 2, 3 and 4) includes, upstream and downstream of the transport paths81and82, an input section with upper and lower input driving belts91and92and, respectively, an output section with upper and lower output driving belts93and94. The input belts91and92have accesses converging towards the extraction and trimming device44and ensure the movement of the sheets separated from the forms23H,23L and emerging from the extraction and trimming device towards the transport paths81and82. In turn, the belts93and94have outputs converging towards the output buffer47and provide for the movement of sheets or documents from the transport paths81and82to the output buffer47.

The extensions of the input driving belts91and92and the output driving belts93and94(FIG. 3a) are suitably longer than the length of the longest sheets separable from the continuous forms23H and23L. It for ensuring an independent shift of the cut sheets by the kinematic mechanisms constituting the transport paths81and82and the input and output sections of the singularizing device46.

With reference to the direction of advancement of the continuous forms23H and23L, the input driving belts91and92are inclined upward and, respectively, downward, while the output driving belts93and94are, respectively, inclined downward and upward.

The input driving belts91and92each comprise overlying belts and underlying belts facing with each other for frictionally cooperating with the forms23H and23L emerging from the cutting device49before or after the transversal separation. In particular, the overlying belts of the upper driving belts91and the underlying belts of the lower driving belts92are protruding with respect to the other belts of the pairs. This for making easier the engagement, without jamming, of the forms23L and23H with the driving belts toward the transport paths81and82, in the inclined positions of the switch wedge86. A motor96provides for the movement of the driving belts91and92in a synchronism condition through, not shown, transmission member with transport velocity for the forms and the cut sheets a little higher than the one of the extraction and trimming device44.

The output driving belts93and94are faced to guide surfaces101and102and rolls for frictionally cooperating with the forms23H and23L emerging from the transport paths81and82. In detail, the guide surfaces101and102form a diedre with a corner adjacent to the input of the accumulating and forwarding device47. A motor103provides to move the belts93and94, in a synchronism condition, by means of, not shown, transmission members with a transport velocity for the sheets a little higher than the velocity of the sheets at the output from the transport paths.

In use, a reference transport path of the transport paths81and82, in the configuration “C1” or in the configuration “C2” of the diverter83is provided for receiving the first odd sheet, or the first couple of pair sheets of a reference document, up to the last single sheet or the last couple of sheets originally flanked on the continuous base form24.

For a document that ends with a single sheet, when the leading edge of said sheet has passed the switching zone SWZ, the diverter83is switched to the second configuration C2 or, respectively, to the first configuration C1, with limited deflection of the first sheet, for the access of the other sheet to another transport path. After overcoming the switching zone by the leading edge of the other sheet, the diverter is switched to the reference configuration to minimize the switching times and reducing friction on the switch wedge. The advancing of the two sheets continues until alignment of the trailing edges with the cutting surface of the cutting device29. It is followed by the simultaneous cutting of the two sheets and their extraction by the extraction and trimming device44.

The procedure is similar also for the document that ends with a pair of flanked sheets, as for the continuous base form24ofFIG. 2. Then, the sheets are overlapped in the cutting device29. In this case, however, the diverter83is switched to the reference configuration “RC” immediately after passage of the switching zone SWZ by the overlapped sheets.

Both for the document that ends with the single sheet, and for a document that ends with two originally flanked sheets, the diverter83can be switched to another configuration such as to allow the other transport path to receive respectively the first sheet single, or the first pair of adjacent sheets of a subsequent document, while the one transport path forwards the reference formed document to the output buffer47for further processings.

In accordance with a first embodiment of the invention ofFIG. 3, the transport paths81and82include a respective accumulating and forwarding device or upper and lower intermediate buffers111and112to collect a sheet or a plurality of sheets of a document in formation and forward the document to the output buffer47.

The accumulating and forwarding devices or buffers47,111and112are similar to the accumulating and forwarding device34ofFIG. 1and, for what concerns the stacking of the sheets, each accumulating and forwarding device comprises upper and lower driving belts controlled by a respective motor113,114and116(FIG. 3a), and a stepping ramp117. For the forwarding of documents, each buffer47,111and112comprises a pair of rollers118driven by a respective motor121,122and123, and in which the rollers118have possibility of longitudinal adjustment in function of the length of the sheets to be stacked. The rollers118are provided for stopping the sheets in the stacking, in the condition in which the motors121,122and123are stationary, and to forward formed documents to following processing with the actuation of the same motors.

Suitable detectors, for instance of photoelectric type, not shown in the drawings, detect the correct passage of the sheets between the various sections of the singularizing device46, signaling any condition of jam. Also for the output buffer47, the electronic unit48controls the motor113so as to impose a velocity of the driving belts higher than one of the sheets at the output from the driving belts93and94. The transport velocities have high values increasing from the input section, to the intermediate buffers111and112, the output section and the output buffer47, but within conservative safety limits.

By means of the above described structure, the cutting equipment41can operate, without interruptions, by effecting cuts on the overlapped continuous forms, substantially at the maximum actuating velocity of the cutting device29, ensuring smooth and reliable operations.

Similarly to the accumulating and forwarding device34of the equipment21ofFIG. 1, the accumulating and forwarding devices or buffers47,111and112are suitably configurable for stacking the sheets from top to bottom or from bottom to top and forwarding the formed document for further processing. The arrangement of the pages on the continuous base form is such that, after the separation and transfer to the accumulating and forwarding device, the sequence of the stacked sheets results a natural sequence, with the first page higher in the stack that constitutes the document. For a stacking of the sheets from top to bottom, the arrangement of the pages in the continuous base form24follows a regressive order with respect to the feeding direction “F”. On the contrary, for a stacking of the sheets from bottom to top, the arrangement of the pages follows a progressive order.

The operation of the equipment41is described by way of example, with reference to the continuous forms23H and23L derived from the continuous base form24ofFIG. 2and introduced into the cutting device29(FIG. 3) according to a high-low overlapping condition. The pages are printed side by side with a regressive order for the forming of documents as: “A” (sheets3A-1A), “B” (sheets3B-1B), “C” (sheets1C-4C), “D” (sheets3D-1D) and “E” (sheets3E-1E) and performing sequential cuttings Ct1-Ct8(FIGS. 8aand 8b).

With reference toFIGS. 2, 3, and 6a, for the preparation of the document “A” (see alsoFIG. 8a, “A” and “B”), the electronic unit48activates the diverter83for the second configuration “C2” and the introduction devices28H and28L for the joint advancing of the continuous forms23H and23L, with extraction by the extraction and trimming device44. The switch wedge86(see alsoFIG. 8a, “f”) takes the upper inclined position, while the leading edges of the continuous forms23H and23L are diverted by the lower side of the wedge86and shifted by the lower driving belts92. The electronic unit48now activates the diverter83for the reference central configuration “RC” and proceeds with the advancement of the forms23H and23L up to the length of the sheets3A and2A. Now, the electronic unit48arrests the introduction devices28H and28L and activates the cutting device29to execute the cut “Ct1” (FIG. 8a“a”) with transversal separation of the sheets. The sheets3A and2A, while maintain their overlap condition, leave the belts92and are deposited into the buffer112, arrested by the rollers118.

In sequence, the electronic unit48activates the diverter83to the first configuration “C1” and the introducing device for an overtaking of the form28H (FIGS. 6cand7), sheet3B (see alsoFIG. 8a, “B” and “f”), with extraction by the upper feeding rollers61aand61bof the extraction and trimming device44. The switch wedge86takes the downward inclined position, while the leading edge of the form23H is diverted by the upper guiding side of the wedge86and is shifted by the upper driving belts91.

When the continuous form23H overcomes the switching zone SWZ of the diverter83, the electronic control unit48activates the diverter83to the second configuration “C2” (FIG. 6d) and activates the introduction device28L for advancing also the form23L, sheet1A. The switch wedge86takes the upward inclined position (see alsoFIG. 8a, “f”), while the leading edge of the form23L is diverted by the lower guide side of the wedge86and is engaged for the shifting by the driving belts92. The edge of the switch wedge86also causes a small deformation of the form23H, without substantial troubles to its movement. The unit48activates the diverter83for the central reference configuration “RC” (FIG. 6e) and proceeds with the advancement of the continuous forms23H and23L, jointly extracted by the extraction and trimming device44, and engagement with the input belts91and92.

The advancing of the continuous form23H proceeds up to a stop when the form reaches the length of the sheet3B, while the advancing of the form23L is arrested when the form reaches the length of the sheet1A. The electronic unit48then activates the cutting device29for the cut “Ct2” (FIG. 8a“b”). The sheets3B and1A leave the belts91and92and are deposited into the buffer111and, respectively, into the buffer112, above the sheets3A and2A and arrested by the rollers118. Upon completing of the document “A” in the buffer112, the unit48activates the motor123for forwarding the document to the output belts94and, in sequence, activates the motor118of the output buffer47for following processing.

By proceeding with the formation of the document “B”, the electronic unit48activates the diverter83for the configuration “C1”, the introduction devices28H and28L for the joint advancing of the continuous forms23H and23L and a following activation of the diverter83for the configuration “RC”. The continuous forms23H and23L are advanced by the input belts91up to the length of the sheets2B and1B (see alsoFIG. 8a, “c” and “f”); then, the unit48arrests the introduction devices28H and28L and activates the cutting device29for the cut “Ct3” (FIG. 8a“c”). The sheets2B and1B, in overlapped condition, leave the belts91and are deposited into the upper buffer111on the sheet3B, arrested by the rollers118, completing the document “B”. The unit48then activates the motor122for forwarding the document “B” to the belt94and the motor121of the output buffer47for following processing.

In subsequent cycles for the document “C” (FIG. 8a, “d”, “e” and “f”), firstly the sheets4C and thereafter the sheets2C1C, cuts “Ct4” and “Ct5” are accumulated into the lower buffer112and transferred to the output buffer47, in a manner similar to that described with reference to the document “A”.

For the document “D” (FIG. 8b“g” and “h”), with the diverter83in configuration “C1”, the sheets2D and3D are engaged for the transport by the upper input belts91. After a cut “Ct6” (FIG. 8b“g”) the sheets pass through the upper buffer111and are accumulated, in a waiting condition, into the output buffer47.

On a following advancing step, cut “C7” (FIG. 8b“h”), the sheet3E of the document “E” (FIG. 8b, “h” and “l”) stops into the upper buffer111, already devoid of the sheets2D and3D. In turn, the sheet1D passes through the lower buffer112, overlaps the sheets2D and3D into the output buffer47completing the document, and successive forwarding of the document “D”.

The continuous forms23H and23L advance together for the sheets1E and2E of the document “E”, cut “Ct8” (FIG. 8b, “i” and “l”): then, the sheets are accumulated into the upper buffer111and transferred to the output buffer47, in a manner similar to that described with reference to the document “B”.

The operation of the equipment41for the formation of documents other than those described will be very similar to that previously described and illustrated, with the obvious modifications of the case.

Naturally, the principle of the invention remaining the same, the embodiments and the details of construction can broadly be varied with respect to what has been described and illustrated, by way of non-limitative example, without by this departing from the ambit of the present invention.

By way of example, a cutting equipment131according to the invention similar to the cutting equipment41is shown inFIG. 9. The cutting equipment131comprises a singularizing device132with the diverter82, but devoid of the output buffer and with an electronic unit133which controls the conditions of overlap-flanking of the sheets. This is carried out by means of algorithms which take account of the compositions of the previous document and/or the document following the current one. In the control for the actuation of the cutting device29, the electronic unit133can also respond to the effective conditions of emptying of the buffers for what concerns the accumulation of the sheets into the upper buffer111or the lower buffer112.

A cutting equipment141in accordance with the invention is shown inFIG. 10. The cutting equipment141is also similar to the equipment41for what concerns the presence and functions of the diverter82, but includes a different singularizing device142, an electronic unit143and transport paths, herein indicated by144and146. The transport paths include upper driving belts147and lower driving belts148and are devoid of the respective intermediate buffers. The transfer times of the respective driving belts147and148are differentiated as in the cited patent IT 1,397,442 of Tecnau S.r.l.

The transport paths144and146of the equipment141are provided for transferring the continuous forms23H and23L separately or together in the overlap condition along the path144or along the path146toward the accumulating and forwarding device or output buffer47. Conveniently, the length of the belts147and148is greater than that of the belts111and112of the equipment41ofFIG. 3to achieve differences in the transfer times compatible with the cycles of actuation of the cutting device29and transport velocity of the sheets within acceptable safety limit for transfers without jams or breakages.