EP0988943A2 - Rotary cutting cylinder - Google Patents

Abstract

The invention relates to a knife roller with foil knife, in which, regardless of the format of a blank envelope to be processed and the number, size and position of window openings to be incorporated therein, the correct row of suction holes for the individual transport of the blank envelope itself and the respectively cut out piece of window material are always possible.

Description

The invention relates to a rotatable knife roller according to the preamble of claim 1.
Such a knife roller is known from US-A-4 537 588. It is used to cut out the window from window envelopes. While the envelope blank is transported with the blade roll the resulting through the pane waste piece must be held for a certain time to be discharged and then to a waste hopper. This is done by the axially aligned single row of suction openings, which open within the area enclosed by the foil knives in the roller surface. Although there is a further axially extending row of suction openings in the roller surface, which is connected to its own suction air control channel in the carrier shaft, this row of suction holes is located in front of the knives in the direction of rotation of the knife roller and serves to temporarily hold the front edge of the envelope blank on the roller surface .
With this knife roller, only a single window can be cut out and the cut piece of material or waste piece can be taken from the knife roller to a delivery point which follows in the circumferential direction. In addition, only a certain blank format can be processed in which the distance of the window from the front edge of the blank is within a comparatively narrow range.
Furthermore, it is known from US-A-3 172 321 to provide a counter-roller cooperating with a knife roller for cutting out windows, which transports blank envelopes to be provided with a window past the knife roller and for this purpose a plurality of axially arranged axially one behind the other in the surface has running rows of suction openings, which can be optionally and controlled acted upon by vacuum. For this purpose, two axial suction air control channels are provided in a carrier shaft, which are connected via essentially radial channels to an axial distributor channel in the peripheral surface of the carrier shaft. A bowl-shaped ring sector provided with the suction hole rows is located on the carrier shaft and can be rotated and fixed relative to the carrier shaft in such a way that two adjacent rows of holes are optionally connected to the distributor grooves and thus to the suction air control channels. However, these two rows of suction holes, which can be acted upon by vacuum, only serve to hold the leading blank edge on the counter roller. The adjustment only allows adaptation to different formats or distances between the leading edge of the blank and the window to be cut out. This cutting does not take place in the area of the suction hole rows but in a cutting sector following in the direction of rotation with a particularly hard surface and without suction holes. The cut-out pieces of waste cannot therefore be transported specifically and by means of a vacuum to a predetermined discharge point. Furthermore, a knife roller is known from EP 0 436 142, in which foil knives can be clamped on a roller body part. On its circumference, it has a large number of suction holes arranged in rows for temporarily holding pieces of material cut out of a blank envelope. By means of suction air control disks arranged on the end face of the roller body part, it is possible to supply periodically delivered, controlled suction air, which is supplied through longitudinal bores of the roller axis, to specific rows of suction holes. This ensures that material pieces cut out offset in the circumferential direction of the knife roller are grasped and dispensed precisely in time. The suction air control disks rotating synchronously with the knife roller can only be adjusted relative to the roller body part and only fulfill a distributor function in order to apply suction air to selected rows of suction holes.
A disadvantage here is the long way of the controlled suction air from a suction air control valve through the longitudinal bores and the suction air control disks to their place of use at the suction holes on the circumference of the knife roller. As a result, when the knife roller is rotating at high speeds, it is very difficult to grasp and deliver cut-out pieces of material precisely in time. Since only a maximum of two suction air control disks can be used with this knife roller in a technically sensible design, the number of rows of suction holes that can be specifically acted upon by suction air is limited to two, and thus also the number of pieces of material that can be transported with one roller revolution. In addition, an additional suction bar is required to transport envelope blanks, which requires its own storage, suction air supply and its own drive. Due to the spatially restricted arrangement of the suction bar and cutting film, it is not possible to place window cutouts close to the end of the blank envelope which is gripped by the suction bar.

The invention has for its object a knife roller for Envelope manufacturing and other applications to be designed so that they is as versatile as possible and above all is able to do more than just Dispose of one piece of waste per blank to be processed safely and reliably. It should also allow a window cutout close to the leading one To bring in the transport edge of a blank envelope.

Fig. 1

eine Prinzipskizze einer Schneidstation mit einer Messerwalze

Fig. 2

eine Prinzipskizze einer Schneidstation mit einer Messerwalze und einer abgewandelten Saugluftsteuerung

Fig. 3

im Schnitt wesentliche Teile der Messerwalze und ihre Lagerung

Fig. 4

Teilschnitt des Walzenkörperteils der Messerwalze mit aufgespanntem Folienmesser

Fig. 5

eine Abwicklung des Walzenkörperteils mit einem Folienmesser und einem Briefhüllenrohling

Fig. 6

eine Abwicklung des Walzenkörperteils mit einem abgewandelten Folienmesser mit einem Briefhüllenrohling

Fig. 7

Schnittansicht eines 3/3-Wegeventils in Offenstellung für den Ansaug- und Transportwinkelbereich β von Materialausschnitten

Fig. 8

Draufsicht des 3/3-Wegeventils in Pfeilrichtung VIII

Fig. 9

Schnittansicht eines 3/3-Wegeventils in Offenstellung für den Ansaug- und Transportwinkelbereich α von Briefhüllenrohlingen

Fig. 10

Draufsicht des 3/3-Wegeventils in Pfeilrichtung X

Fig. 11

Schnittansicht eines 3/3-Wegeventiles in Schließstellung

Fig. 12

Draufsicht des 3/3-Wegeventils in Pfeilrichtung XII

Fig. 13

Schnittansicht einer Steuerbuchse

Fig. 14

Seitenansicht der Steuerbuchse.

This object is achieved according to the invention by the features of the characterizing part of claim 1.
First, the knife roller is adjusted in phase angle relative to the envelope machine so that window cutouts are made at the desired location in the envelope blank, which is transported through the cutting station in the machine cycle. Then, by appropriate selection and setting of a 3/3-way valve, a row of suction holes in the area of the leading edge of the envelope blank is activated as a row of suction devices for transporting the blank for a suction and transport angle range α. In a similar way, the rows of suction holes for the transport of cut-out pieces of material are activated over the suction and transport angle range β.
Further features of the invention emerge from the subclaims in connection with the description and drawing.
The advantages achieved with the invention are to be seen in particular in the fact that regardless of the size and number and position of window cutouts in a blank envelope by the appropriate selection and setting of 3/3-way valves, the correct rows of suction holes for the transport of the blank envelope or the material cutouts can be activated via the suction and transport area α or β.
The features of claim 3 also make it possible to cut out window cutouts close to the leading edge of a blank envelope and, by activating the correct rows of suction holes, to record both the material cutouts and the leading edge of the blank envelope itself through the openings in the foil knife.
The invention is described below with reference to exemplary embodiments which are illustrated in the drawing. Show

Fig. 1

a schematic diagram of a cutting station with a knife roller

Fig. 2

a schematic diagram of a cutting station with a knife roller and a modified suction air control

Fig. 3

on average, essential parts of the knife roller and its storage

Fig. 4

Partial section of the roller body part of the knife roller with a stretched foil knife

Fig. 5

a development of the roller body part with a foil knife and a blank envelope

Fig. 6

a development of the roller body part with a modified foil knife with a blank envelope

Fig. 7

Sectional view of a 3/3-way valve in the open position for the suction and transport angle range β of material cutouts

Fig. 8

Top view of the 3/3-way valve in the direction of arrow VIII

Fig. 9

Sectional view of a 3/3-way valve in the open position for the suction and transport angle range α of envelope blanks

Fig. 10

Top view of the 3/3-way valve in the direction of arrow X

Fig. 11

Sectional view of a 3/3-way valve in the closed position

Fig. 12

Top view of the 3/3-way valve in the direction of arrow XII

Fig. 13

Sectional view of a control socket

Fig. 14

Side view of the control socket.

According to the embodiment shown in principle in Fig. 1 comprises a Cutting station 1 for window envelopes a knife roller 2 and a Counter tool serving stationary cutting bar 3, between which a sequence of Envelope blanks 4 is passed and processed. The cutting bar 3 is clamped with a bar 6 stored in a carrier 5 and together with this can be moved towards the knife roller 2 and away from it.

The cutting station 1 a according to FIG. 2 has a rotating counter-roller 3 a Counter tool to the knife roller 2, between which the sequence of Envelope blanks 4 is passed and processed. The counter roller 3a is mounted in a carrier (not shown) and with it onto the knife roller 2 movable to and from this.

The envelope blank 4 coming from a straight transport path 7 is gripped by the knife roller 2 and passed along a circular path under the counter tool, cutting strip 3 or counter roller 3a, a window opening 8 'being cut out. The knife roller 2 (FIG. 3) has a plurality of suction openings 11 arranged in rows 10 in order to take over and transport the envelope blank 4 seized and a window cutout or material piece 8 cut out of the window 8 '. The envelope blank 4 is held over a suction and transport angle range α by means of suction air on the knife roller 2, maintains its predetermined phase position and is then transferred to a discharging roller 12 in the correct position. The piece of material 8 is held in the window knife periphery by means of suction air and, after a suction and transport angle range β, is finally discharged into a suction funnel 13, possibly blown off with the aid of compressed air.
The cutting and holding of the piece of material 8 cut out of the window 8 'and its delivery into the suction funnel 13 take place in the cutting station 1 according to FIG. 1 in the same way as in the cutting station 1a according to FIG. 2.
Fig. 3 shows the knife roller 2 or its storage and essential parts of the knife roller 2 in section, but without a foil knife and without the parts used to fasten and tension the foil knife. The knife roller 2 comprises a carrier shaft 14 which is supported with the aid of a plurality of ball bearings 15 in machine frames 16, 18 and can be driven by means of a toothed wheel 17. Between the machine frames 16, 18, a cylindrical roller body part 19 is fastened on the carrier shaft 14, on the circumference 20 of which the suction openings 11 are arranged in the form of rows 10. In the roller body part 19, as shown in FIGS. 3 and 4, at a distance d from the axis of rotation 2 'of the knife roller 2, suction channels 21 are arranged axially parallel, which are in air-conducting connection with suction openings 11. In the exemplary embodiment, three rows 10 of suction openings 11 are assigned to one suction channel 21, except in the area of a knife attachment 22, where only two rows 10 are associated with one suction channel 21.

The knife attachment 22 with which the knife roller in a direction of rotation 23 leading ends 26 of foil knives 24 are fixed, includes a Axially parallel recess 25 in the roller body part 19, in which the ends 26 are angled folded with the help of a terminal block 27 are fixed. On the circumference of 20 Roller body part 19, the foil knife 24 is held in a known manner, e.g. by means of magnetic elements arranged in the roller body part 19 or by Set the trailing end in the direction of rotation 23 with a Clamping device similar to the knife attachment 22. Both types of attachment belong to the prior art and are not described in detail here. In Fig. 4, 5 and 6, only one knife attachment 22 is shown in each case. It can however, several can also be provided in each cutting roller 2, especially if if the cutting roller 2 is designed for multiple uses.

When used as a so-called window knife, a foil knife 24 has one of the Form of a window opening 8 'corresponding closed cutting edge 28. In of the surface of the foil knife 24 enclosed by the cutting edge 28 for sucking the cut piece of material 8 near one in the direction of rotation 23 leading cutting edge 28 'openings 29 are provided in the Open suction openings 11.

In FIGS. 4 and 6, openings 30 of the film knife 24 are shown, which are shown in Direction of rotation 23 are arranged in front of the cutting edge 28 'and also in the Open suction openings 11. These openings 30 are for detecting the leading end 4 'of an envelope blank 4 is provided, in which a Window opening 8 'is cut out near the leading end 4'. In Fig. 7 however, the normal case is shown, with the leading end 4 'one Envelope blanks 4 by means of suction openings 11 arranged in rows 10 directly is held on the circumference 20 of the roller body part 19.

A suction air control valve 31 is arranged on the end face of the roller body part 19 is mounted on the frame wall 18 by means of a spacer and centering bush 32. Compared to the roller body part 19 rotating in the direction of rotation 23, this is Suction air control valve 31 is arranged in a rotationally fixed manner, but in or against the Direction of rotation 23 adjustable. Besides, it's not a closed rotating body, but because of better accessibility and ease of maintenance horseshoe-shaped. The suction air control valve 31 has one Suction air control channel 33, from which, as shown in Fig. 3 and Fig. 1, the Suction channels 21 with a suction and transport angle range α or β Suction air can be acted upon. The suction air control channel 33, which is centered on the Rotation axis 2 'is arranged, is stepped and has a first Channel zone 34 for the suction and transport angle range α and a second Channel zone 35 for the suction and transport angle range β. In the Suction air control channel 33 opens a suction air supply 36, the radially from the outside is attached to the suction air control valve 31. The suction air supply 36 connects the Suction air control channel 33 via a feed device, not shown Suction air source. The duct zones 34 and 35 are each a fresh air duct 36 or 37 downstream, from where a reduction of the negative pressure in the suction channels 21 and suction openings 11 is caused. The fresh air duct 37 (Fig. 3) is under Overpressure maintained. It is by means of a compressed air supply 38 with one compressed air source shown connected. By using compressed air achieved that the cut pieces of material 8 at the end of the suction and Transport angle range β are blown into the suction funnel 13.

2 shows a slightly modified variant 31 'of the control head 31. Here are instead of the stepped suction air control channel 33 with the channel zones 34, 35 two separate, concentric suction air control channels 39, 40 are provided in turn, the fresh air channels 36 and 37 are arranged downstream.

In the end 19 'of the roller body part 19 opposite the suction air control valve 31, each suction channel 21 is assigned a 3/3-way valve 41, with the aid of which an air-conducting connection between the suction channel 21 and an inner or outer through bore 42 or 43 arranged at the end can be produced is. The through bores 42, 43, which are arranged radially offset at a distance d ₁ or d ₂ from the axis of rotation 2 ', pass through the channel zone 34 and fresh air channel 36 or the channel zone 35 and fresh air channel 37 with each cylinder revolution (FIG. 1) and become thereby Cyclically charged with suction or fresh air. Since in the exemplary embodiment d and d _{1 are the} same, a suction channel 21 and a through bore 42 assigned to it are axially aligned.

In the variant with the control head 31 ′, the through bores 42 pass through and 43 corresponding to FIG. 2 on the suction air control channels 39 and 40 and Fresh air channels 36 and 37 over.

According to FIGS. 3 and 7 to 12, a 3/3-way valve 41 is formed from a radial blind hole 44 into which the suction channel 21 opens from the side of the roller body and the through holes from the side of the suction air control valve 31, 31 ' 42.43. A rotatable control bushing 45 is arranged in the blind hole 44 and secured by means of sealing and holding elements, not shown. As can also be seen in FIGS. 13 and 14, the control bush 45 has the shape of a hollow cylinder, with an interior 46 which is closed towards the circumference 20. A bore 47 opens into the interior 46 corresponding to the distance d ₂ and a bore 48 opposite this corresponds to the distance d, d _1. 90 ° to the bore 48 are two opposite bores 49, 50 in the control bush 45 corresponding to the distance d, d ₁ arranged.

In addition, in FIGS. 7 to 12, the control bushing 45 is different Function positions 51,52,53 shown.

7 shows the open position 51, in which an air-conducting connection from through hole 43 through hole 47, interior 46, hole 48 and Suction channel 21 to suction bores 11 of a corresponding row 10 is made.

Suction channel 21 to suction bores 11 of a corresponding row 10 is made. As a result, the channel zone 35 or at the suction air control valve 31 Suction air control valve 31 'of the suction air control channel 40 with selected Suction openings 11 connected to conduct air.

FIG. 9 shows the control bush 45 in the open position 52, in which an air-conducting connection between the channel zone 34 via the through bore 42, bore 49, interior 46, bore 50 and suction channel 21 to selected suction openings 11 is established.
11 shows the control bush 45 in the closed position 53, in which the respective suction channel 21 is blocked. The functional positions 51, 52, 53 can be freely selected for each 3/3-way valve 41 and thus also for the associated suction channels 21 and rows 10 of suction openings 11. The functional positions of the control bushes 45 are evident from the positional alignment of the marking grooves 54, 55 provided on them in relation to the circumferential marking grooves 56, 57 arranged on the circumference 20 of the roller body part 19.

The operation of the invention is described below:
First, by adjusting elements in the drive, not shown, the knife roller 2 is adjusted in its phase position relative to the envelope machine so that a window opening 8 'to be introduced is made at the desired location on the envelope blank 4 which is delivered in a regular phase position in the machine cycle. Then one or more 3/3-way valves 41 are brought into the open position 52 by appropriate selection and adjustment. As a result, selected rows 10 of suction openings 11 are supplied with suction air from the channel zone 34 or suction air channel 39, for the transport of the envelope blank 4 over the suction and transport angle range α.

Similarly, the desired rows 10 of suction holes 11 are made through Open position 51 with the duct zone 35 or suction air control duct 40 air-guiding connected to transport a cut piece of material 8 over the Suction and transport angle range β in the suction funnel 13.

To prevent false suction, as shown in FIGS. 5 and 6, the Suction openings 11 of rows 10 activated for transport, which are not from the Foil knife 24 are covered or not for transporting the Blank envelopes are needed, covered with adhesive film. The Adhesive film surfaces are highlighted in FIG. 5 and FIG. 6 by hatching areas.

As can easily be seen by the person skilled in the art from FIGS. 5 and 6, the Invention regardless of the format of an envelope blank 4 and the number, Size and location of window openings 8 'to be introduced therein always the Possibility through targeted activation of selected or required rows 10 of suction holes 11 a smooth, flawless transport of the Envelope blanks 4 and the cut pieces of material 8 guarantee. As shown in Fig. 6, it is with the inventive knife roller 2 also possible, window openings 8 'close to that in the transport direction 23 to place leading edge 4 'of an envelope blank 4.

Finally, the technology disclosed by the invention can also be used in rolls with similar and other functional tasks.
The invention is therefore not limited to the specific exemplary embodiment, but further modifications and additions are possible without deviating from the basic inventive idea.

Claims (8)

Rotatable knife roller with at least one foil knife attached to one Roll body part is attachable and for cutting out Window openings create a beautiful, endless, self-contained cutting edge carries within the openings for suction openings are arranged with at least one end face on the roller body part and relatively rotatable this arranged suction air control valve, the at least one Has suction air control duct and at least one fresh air duct and with Suction openings for temporarily holding a blank envelope over a suction and transport angle range α and one from Foil knife cut piece of material via a suction and Transport angle range β, the suction openings arranged in rows are, which are assigned suction channels in the roller body part and where Suction openings through the suction channels with the suction air control channel and the fresh air duct can be connected in an air-conducting manner, characterized in that that in front of the suction air control valve (31, 31 ') the suction channel (21) a 3/3-way valve (41) is assigned, each with an open position (52, 51) for the Intake and transport angle range α, β and a common one Closed position (53) for the suction and transport angle ranges α and β. Knife roller according to claim 1, characterized in that the Suction air control valve (31) a stepped suction air control channel (33) has, with a first channel zone (34) for the intake and Transport angle range α, which is followed by a first fresh air duct (36) and a second channel zone (35) for the intake and Transport angle range β, which is followed by a second fresh air duct (37) and that the first duct zone (34) and the first fresh air duct (36) are one Through hole 42 in the roller body part (19) and the second channel zone (35) and the second fresh air duct (37) a through hole (43) in Roller body part (19) are assigned. Knife roller according to claim 1, characterized in that the Suction air control valve (31 ') two radially offset, concentrically arranged Suction air control channels (39.40), each of which has a fresh air channel (36,37) is subordinate, and that the suction air control channel (39) and the Fresh air duct (36) of the through hole (42) and the suction air control duct (40) and the fresh air channel (37) of the through hole (43) are. Knife roller according to one of claims 1-3, characterized in that the 3/3-way valves (41) are integrated in the roller body part (19), and a 3/3-way valve (41) is formed from a radially in the roller body part (19) arranged bore (44), one side of a suction channel (21) and the other side radially offset an inner and an outer Through bore (42, 43), which are open to the suction air control valve (31), open into the bore (44), and wherein a rotatable in the bore (44) Control bushing (45) is arranged, which has an interior (46) and the to the cylinder circumference (20) is closed and the holes (47,48,49,50) arranged such that they in the open position (51) Through hole (43) via the holes (47,48) and the interior (46) and in the open position (52) the through hole (42) via the Bores (49.50) and the interior (46) with the suction channel (21) are connected in an air-conducting manner, and that in a closed position (53) Suction channel (21) to the through holes (42,43) can be closed. Knife roller according to one of claims 1-4, characterized in that according to the format of an envelope blank (4) and the number, size and location the window cutouts in it specifically air-conducting connections between Suction openings (11) of selected rows (10) and the suction air control valve (31, 31 ') can be produced by opening (51, 52) with specifically selected ones 3/3-way valves (41). Knife roller according to claim 2, characterized in that in a Direction of rotation (23) of the knife roller (2) in front of a first cutting edge 28 ' additional openings (30) are arranged in the foil knife (24) for Gripping the leading edge (4 ') of an envelope blank (4), in which a window cutout is placed close to the leading edge (4 '). Knife roller according to claim 2 or 3, characterized in that at least one fresh air duct (36, 37) can be pressurized with compressed air. Knife roller according to claim 1, characterized in that on both A suction air control valve (31, 31 ') in each case on the end faces of the roller body part (19) is arranged.

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