EP1541300A2 - Use of an apparatus for cutting a web of material and apparatus used therefor - Google Patents

Abstract

The device (1) cuts a length of material (B) moving at a speed (VB), into sections of set length. It has a cutting roller (2) with an angular velocity (w) for cutting, adaptable to the speed of the material length. The roller speed can be accelerated and/or delayed between two subsequent cuts. The material is cut along pre-set lines, located between lines of an accessory material, esp. glue (3), which are raised relative to the material plane in direction of the cutting roller. The device is for use in a window glueing station of an envelope fabrication machine, and the material length is of window material. The cutting roller has several cutting knives evenly distributed over its circumference.

Description

I. Field of application

The present invention relates to the use of a device for cutting a material web moving at a web speed into sections and an apparatus for use within the scope of the invention Use. The invention can be used in particular in workstations of envelope production machines be used in which the envelope material web, from which the envelopes are made, or that of the aforementioned Envelope material web Separated envelope cut Additional components the finished envelope are supplied, such as a transparent Window material in the production of envelopes with viewing window.

II. Technical background

It is known in letter envelope manufacturing machines so-called window loading stations provided. In such stations, for example, from Pergamin existing window material web glued and then by means of a rotating cutting roller in window material sections or pieces with the cut the desired format. The window material sections then become on the letter envelope material web passing through the envelope production machine or the envelopes passing through the envelope production machine placed so that they there the previously introduced window pane cover. The cutting roller is exactly one, on its circumference arranged separating knife equipped.

The cutting roller is so-called in the known window loading stations Cycle roller trained. This means that the a constant diameter having cutting roller with constant angular velocity in the machine cycle rotates. The cutting of the window material web takes place in this constellation either by means of a synchronous or by means of a pulling cut. Of the Ideal case of a synchronous cut is given when the tangential peripheral speed of the cutting blade of the cutting roller equal to the web speed the window material web is. A pulling cut occurs when the tangential Peripheral speed of the cutting blade of the cutting roller larger than the web speed of the window material web is. To avoid is one Cutting situation in which the tangential peripheral speed of the cutting knife the cutting roller is smaller than the web speed of the window material web is because this is to slow down the window material web during the Cutting, thus causing a jam of the web and a failure of the window insertion station would lead.

Due to the need for a synchronous or pulling cut the Cutting roller - more precisely, that of the cutting edge of the cutting knife continuous orbit, whose diameter or circumference in the following simplicity half as the diameter or circumference of the cutting roller is called - have a minimum diameter. This minimum diameter results from the largest, to be cut window material section length. The transaction the circumference of the cutting roller must be at least as long as the maximum to cutting section length. If this is the case, then when cutting Window material sections with the maximum section length exactly synchronous Cut. Shall shorter window material sections be provided, Thus, the cutting roller still rotates at the same angular velocity and the web speed is preceded by means of a cutting roller Pull roller reduced. The section length is thus determined by the speed of Zugwalze determined. The peripheral speed of the cutting blade of the cutting roller is in this case higher than the web speed of the window material web, so that it comes to a pulling cut.

Before cutting by means of the cutting roller, the window material web is in known Way provided with a glue trace in a suitable arrangement. This glue trace ensures that the later window material sections securely on the stick later envelope and cover the existing there window opening. The cutting of the window material web must be exact between two proportions take place close to each other arranged glue traces. The glue marks have a certain spatial extent in the direction perpendicular to the plane the window material web, so that to be observed a minimum diameter Circular path of the cutting edge of the cutting blade of the cutting roller often interspersed with the space that the two immediately adjacent Adopt traces of glue between which the planned cutting process is located. The glue marks thus form an obstacle to spatial accessibility the cutting path for the cutting blade deteriorated. Blurs it the glue on both the window material web and on the cut Window material sections, resulting in bonding of the window material section with transport facilities leads the envelope production machine, the the failure of the production process can result.

III. Presentation of the invention a) Technical task

It is therefore the object of the present invention to show a possibility to cut a material web along hard-to-reach cutting paths, the sublime traces raised relative to the plane of the web of material; especially traces of glue, are, without the excipient in an undesirable manner smear when cutting the web.

b) Solution of the task

This object is achieved by means of the use according to claim 1. A device for use in the context of the use according to the invention proposed according to claim 6. Further embodiments of the present Invention will become apparent from the dependent claims.

From DE 100 30 055 A1 a device is known for cutting a itself with a web speed moving material web in sections with predetermined Section length known. This known device has a cutting roller on whose angular velocity for cutting the material web to the Path speed is customizable and that between two consecutive Slices accelerated and / or delayed. The adjustment of the angular velocity the cutting roller to the web speed can be done in such a way that a synchronous or a pulling cut takes place, as in the case of the clock roll.

According to the invention, the per se known from DE 100 30 055 A1 Device for cutting the material web along predetermined Use cutting curves that are between relative to the plane of the web lie in the direction of the cutting roller raised or protruding Hilfsstoffspuren. This is achieved in an advantageous manner that the diameter of the Cutting roller can be significantly reduced, since the cutting roller in dependence accelerated by the section length to be cut differently strong or can be delayed. It is no longer necessary to change the diameter of the Adjust cutting drum to the maximum section length to be cut. by virtue of of the smaller cutting roll diameter penetrates the circular path of the Cutting knife of the cutting roller no longer the traces of excipients, between which the intersection lies and the latter are spatially surrounded. This happens no smearing of the traces of excipients. Possibly. the excipient traces can even be arranged closer to each other, which is advantageous to a saving leads to window material web.

The use according to the invention can be used everywhere be where a material web along spatially cramped cutting paths between raised traces of excipients must be cut. This is not just in window loading stations from envelopes making machines the case, but for example also in the separating station or the pressure-sensitive adhesive strip station such machines. Separator inserts are in envelopes with multiple spaces used for their separation. They become as well as the window material in the envelopes glued in and from a previously glued Trenneinlagenmaterialbahn cut off. Pressure-sensitive adhesive strips cover the self-adhesive area for example, on a closing flap of an envelope and before closing the envelope removed from the user. The pressure-sensitive adhesive strips are in a pressure-sensitive adhesive tape station from a previously provided with an adhesive Adhesive strip material web cut off.

The use according to the invention leads to relatively high accelerations or delays and thus to considerable mechanical stresses the cutting roller, their storage and their drive elements. Around To keep loads within reasonable limits, according to the invention a device for cutting a moving at a web speed Material web in sections with predetermined section length with a Cutting roll proposed whose angular velocity for cutting the Material web is adaptable to the web speed and between two acceleration and / or delay is successive sections, the Device characterized in that at least two or more Disconnecting blades are arranged on the circumference of the cutting roller. Thereby can the accelerations or delays of the cutting roller, depending on are more or less large of the section length to be cut, be limited because for each next cutting process is not complete Rotation of the cutting roller is more required. Depending on the number the cutting knife, the diameter of the cutting roller and the desired Section length can the occurring acceleration or deceleration forces be reduced in an advantageous manner in particular. The arrangement of Cutting knife over the circumference of the cutting roller is preferably uniform always at the same angular distance.

c) embodiment

Fig. 1:

einen Schnitt durch eine Fenstereinklebestation einer Briefhüllenherstellungsmaschine zur Erläuterung der erfindungsgemäßen Verwendung;

Fig. 2:

eine Aufsicht auf eine teilweise beleimte Fenstermaterialbahn sowie einen vereinzelten, beleimten Fenstermaterialabschnitt; und

Fig. 3:

eine Teilschnittdarstellung zweier Schneidwalzen, die die mit der erfindungsgemäßen Verwendung erreichbare Verringerung des Schneidwalzendurchmessers illustriert.

Hereinafter, an embodiment of the present invention will be described by way of example with reference to the accompanying drawings. Show it:

Fig. 1:

a section through a window insertion station of a envelope production machine for explaining the use of the invention;

Fig. 2:

a plan view of a partially glued window material web and an isolated, glued window material section; and

3:

a partial sectional view of two cutting rollers, which illustrates achievable with the inventive use reduction of the cutting roll diameter.

Fig. 1 shows a sectional view through the window embedding station of a envelope production machine, which is traversed according to arrow R from right to left of an existing paper envelope paper web BB or Briefhüllenzuschnitten. In the window insertion station from a supply roll, not shown, a window material web B at a web speed V _B via a guide roller 4 of a glue application roller 5 is fed, which rotates counterclockwise and in the embodiment shown a glue trace 3 in the form of a rectangular ring on the window material web B applies, as on best in the plan view of FIG. 2 can be seen. The glue is applied in such a way that two successive rectangular glue tracks 3 have the distance s shown in FIGS. 1 and 2. In the area of this distance s, the cut separating the window material web B into individual sections A is to be placed in each case.

After gluing by means of the glue application roller 5, the window material web B is transported via a clockwise rotating transport roller 6 and a suction transport device 7 to a device 1 for cutting the window material web B into sections A. The device 1 comprises a cutting roller 2, which is rotationally drivable with a constant or non-constant angular velocity ω in the counterclockwise direction. In the embodiment shown, the cutting roller 2 has at its periphery a single cutting knife 8, which cooperates for cutting the window material web B with a strip-shaped counter cutting element 9. The cutting edge of the cutting knife 8 moves during the rotation of the cutting roller 2 on a circular path with the diameter d _M , as shown in Fig. 1.

After the cutting roller 2 by means of the cutting edge of the rotating cutting knife 8 in the range of the distance s between two consecutive, rectangular glue tracks 3 a section A with the section length AL of the window material web B has cut off, this is to a suction roll 10th pass, which rotates clockwise. For the sake of simpler drawing Representation is in Fig. 1, only a suction channel 11 of this suction roller 10th shown. The suction roll 10 leads the separated glued section A at its Extent by an angular distance of 180 ° down, after passing through this angular distance of the section A on the previously in the envelope material web BB or in the respective letter envelope cut window pane is glued on. The glue trace 3 serves this purpose.

The device 1 for cutting the window material web B is, for example as drivable, as described in DE 100 30 055 A1. This means, that the angular velocity ω of the cutting roller 2 is not over an entire Rotation of the cutting roller 2 is constant. Instead, it depends on the size of the window in the envelope to be produced or depending on the desired Section length AL to accelerate or retard the rotational movement the cutting roller. 2

Due to the use of the device known per se from DE 100 30 055 A1 in the window insertion station of a letter envelope production machine, the diameter d _{M of} the cutting roller 2 can be minimized. It is not necessary, as in the previously known window insertion stations due to the need for a synchronous or pulling cut to use a cutting roller with a relatively large diameter.

As indicated in FIG. 1, the glue tracks 3 have a certain spatial extent perpendicular to the plane of the window material web B (upward in FIG. 1). The cutting edge of the separating knife 8 of the cutting roller 2 must therefore first move across a glue trace for cutting between two glue tracks 3, then perform the cutting process in the region of the distance s and then back out of the plane of the window material web B over another glue trace move upwards. The trajectory of the cutting edge of the cutting blade 8 should be as steep as possible both when moving to the interface and when moving away from the interface with respect to the plane of the window material web B, to avoid that the trajectory of the cutting edge passes through the glue marks 3 and glue entrains and / or thrown away, so that glue gets to unwanted locations of the window material web B. In this sense, steep trajectories of the cutting edge of the cutting blade 8 were only possible with the use of the present invention. The formation according to the invention of a sufficiently steep or sufficiently strongly curved path of movement of the cutting edge of the separating knife 8 was ultimately made possible by a minimization of the diameter d _{M of} the cutting roller 2 independent of the section length AL.

In Fig. 3 the reduction of the diameter of the cutting roller 2 according to the invention is shown qualitatively on the basis of a sectional view of the cutting roller. The cutting roller 2 previous window loading stations had the diameter D _M on. The use according to the invention enables a cutting roller 2 with the considerably reduced diameter d _M.

In the embodiment of the inventive use shown, the distance between two adjacent glue tracks is s = 4 mm, the width of the glue tracks 3 b = 8 mm and the section length AL = 50 to 280 mm. In these exemplary proportions, the diameter of the cutting roller can be reduced to d _M = 64 mm, this diameter before finding the solution according to the invention D _M = 90 mm. Accordingly, a reduction of the cutting roll diameter could be achieved by about 29%. In the context of the present invention, cutting roll diameters or circumferences are implemented which obey the inequality Π d _M ≦ 0.9 AL _max , preferably Π d _M ≦ 0.75 AL _max , where AL _{max represents} the maximum cut length AL, which in the window capture station is to be cut.

The acceleration or deceleration of the cutting roller 2 in the context of the use according to the invention takes place in such a way that the cutting edge of the separating knife 8 performs a synchronous or pulling cut. If the section length AL is larger than the circumference of the cutting roller 2, its angular velocity after deceleration is retarded to be accelerated in time before the next cut to a peripheral speed equal to or higher than the web speed V _B. If the section length AL is smaller than the circumference of the cutting roller 2, it is accelerated after the cut to be retarded in time before the next cut to a peripheral speed equal to or slightly higher than the web speed V _B.

In the embodiment shown, the cutting roller 2 has a single separating knife 8 on. To the invention required acceleration and deceleration forces not to be too large, the cutting roller 2 with several cutting blades are provided at its periphery. This will be a Control of the cutting roller 2 with lower accelerations or delays allows as in the case of only a single cutting knife on the Scope of the cutting roller 2 occur. Particularly suitable in this context an arrangement of the plurality of separating blades at equal angular intervals over the circumference of the cutting roller 2 away.

LIST OF REFERENCE NUMBERS

1

contraption

2

cutting roller

3

glue line

4

deflecting

5

Leimapplikationswalze

6

transport roller

7

suction transporting

8th

separating knife

9

Against cutting element

10

suction roll

11

suction

V _B

web speed

w

angular velocity

B

Window web

BB

Envelope material web

s

Distance of glue traces

b

Width of the glue line

AL

section length

dm

Diameter cutting roller according to the invention

D _M

Diameter cutting roller according to the prior art

R

Running direction of the envelope material web

Claims (7)

Use of a device (1) for cutting a material web ( _B ) moving at a web speed (V _B ) into sections (A) with a predetermined section length (AL), the device (1) having a cutting roller (2) whose angular velocity ( ω) for cutting the material web (B) to the web speed (V _B ) is adaptable and which is accelerated and / or delayable between two successive cuts, for cutting the material web (B) along predetermined cutting paths, between relative to the plane the material web (B) in the direction of the cutting roller (2) raised auxiliary material tracks (3). Use according to claim 1,
characterized in that
the excipient traces (3) are glue marks. Use according to one of claims 1 or 2,
characterized in that
the device (1) is used in a window insertion station of an envelope production machine, wherein the material web (B) is a window material web. Use according to one of claims 1 or 2,
characterized in that
the device (1) is used in a separation pad station of a mailer making machine, the web (B) being a release liner web. Use according to one of claims 1 or 2,
characterized in that
the device (1) is used in a pressure-sensitive adhesive strip station of an envelope production machine, the material web (B) being a pressure-sensitive adhesive strip of material. Device for cutting a material web ( _B ) moving at a web speed (V _B ) into sections (A) of predetermined section length (AL) with a cutting roller (2), whose angular velocity (ω) for cutting the material web (B) at the web speed (V _B ) is adaptable and that between two successive sections is accelerated and / or delayed,
characterized in that
a plurality of separating blades are arranged on the circumference of the cutting roller (2). Device according to claim 6,
characterized in that
the cutting blades over the circumference of the cutting roller (2) are arranged evenly distributed.

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