EP2058115A2 - Rotation stamping device - Google Patents

Abstract

The device (10) has a transport device (13) transporting a printing substrate (2) i.e. folding box cut-out, upstream of stamping tools (11, 12) and exhibiting a drive independent from the stamping tools. The printing substrate is synchronized with respective to a stamping position regarding a front edge or rear edge of a surface provided with the stamping by changing the transportation speed (vT) of the transport device. The printing substrate is synchronized relative to the first or last stamp that is effective in progress during stamping process. An independent claim is also included for a method for operating a rotation stamping device.

Description

The invention relates to a rotary embossing device according to the preamble of claim 1, a method for operating a rotary embossing device according to claim 10 and a folding box gluing machine according to claim 11.

Folding cartons are cardboard or corrugated board packaging, and to a lesser extent plastic, which are glued at one or more points during the folding process, depending on the design. They are usually produced from a blank. The blanks are usually punched out on a sheet punch. The blank must be glued at least at one edge. The folded boxes come out of the carton gluer in the flat state. The placement and filling of the box can be done by machine or manually.

In addition to the folds required to produce the cartons, further creasing lines in the carton gluer are pre-folded (prefolded) to prepare for the subsequent production step. This facilitates the installation of the box and the subsequent filling.

If the cartons are used for the packaging of medicines, it is legally required to apply the name of the medicament in Braille (so-called Braille) to the carton (eg by embossing).

According to the prior art, the embossing of braille is carried out either during the punching process in the sheet punch in the production of blanks. However, this is expensive because a punching sheet several benefits, ie blanks contains and for each benefit a pair of tools consisting of die and male must be provided. Or there are rotary embossing devices with two rotating embossing tools are used, which may for example be part of a Faltschachtelklebemaschine. As known, such rotary embossing devices have a common drive for both rotary tools. In order to apply the embossing in the correct position on the Faltschachtelzuschnitt, the rotation tools relative to Faltschachtelzuschnitt be synchronized. In particular, when introducing a braille in the carton blank synchronization must be done very accurately. Due to the moment of inertia of die, male and rotary drive the required accuracy of synchronization is difficult or impossible to achieve. Another disadvantage is that rotary embossing devices for better synchronization are often driven in start / stop operation. Ie. the rotary embossing tools are stopped for synchronization and subsequently accelerated again. As a result, the production capacity of the rotary embossing device is severely limited. Next you production is limited by the fact that no adjustment of the rotary embossing device to the size of the product to be processed is possible.

The EP 1 447 211 A2 shows a device for impressing transverse grooves in cardboard. The EP 1 537 920 A1 shows an apparatus for cutting, creasing and embossing sheet material, such as cardboard, with two rollers. Both devices have in common that the synchronization can not be performed with the braille required accuracy and that no adaptation of the devices to the size of the product and the distance of the products is possible.

The EP 1 398 141 B1 shows a folding box gluing machine with a folding station and a closing station. In addition, there is an intermediate station between the two stations, which serves to change the transport speed of folding box hoses and to reduce the distance between successive folding box hoses. A positioning of the Faltschachtelschläuche relative to the tools of the closing station does not take place.

The object of the present invention is to provide a rotary embossing device which overcomes the disadvantages of the prior art and enables high output while maintaining high embossing quality.

This object is achieved by a rotary embossing device with the characterizing features of claim 1.

The rotary embossing device according to the invention has two rotating embossing tools, driven by at least one embossing tool drive, for introducing embossings, in particular braille, into printing substrates, in particular folding carton blanks. The embossing tools are formed by a stamped male and a die. The template serves as a counter-mold and is advantageously product-neutral and has a uniform hole pattern. In the upstream direction, the embossing tools of the rotary embossing device are preceded by a transport device for transporting the printing materials. The transport device advantageously has a drive which is independent of the at least one embossing tool drive and which can be designed, for example, as a controllable electric motor. By the transport means a respective printing material undergoes a change in its transport speed, whereby the printing material is synchronized with respect to its embossing position relative to the punches of the male, i. the seen in the direction of transport front edge of an imprint to be provided surface of the printing material is synchronized relative to the one or the first stamping process becoming effective stamping the male, so tuned in their position. Alternatively, the trailing edge of the surface to be imprinted may also be positioned relative to the stamp (s) most recently effective in the stamping process. This synchronization makes it possible in an advantageous manner that the embossing tools can be operated at a constant speed. The synchronization of substrates and embossing tools is no longer done as usual by adjusting the rotational speeds of the embossing tools, but as exclusively as possible by adjusting the transport speed in the transport device. Consequently, since the rotary tools no longer have to be constantly accelerated and decelerated, the rotary tools can be operated at a higher speed. As a result, the output of the rotary embossing device is increased significantly in an advantageous manner.

In a particularly advantageous embodiment of the rotary embossing device according to the invention the transport device is preceded by a transport system, which is designed for example as a circulating conveyor belt and which one of the embossing tool drive and the drive of the transport device dependent drive, such as an electric motor has.

In a particularly advantageous embodiment of the invention, the rotary embossing means has a means for determining the rotational speed of the male. This may be, for example, a rotary encoder or a sensor. By this means, the position of the punch of the male can be further determined. The upstream transport system has at least one sensor for determining the position of a transported printing material and also a means for determining the transport speed of the transported printing material. The means may also be a rotary encoder or a sensor. The electric motor for driving the transport device, the means and the sensor are connected via data lines to a control device.

In an advantageous development of the rotary embossing device, the transport device has a lower and an upper conveyor belt, between which the printing material can be clamped. As a result, the printing material can be safely and reliably guided and transported.

In an advantageous embodiment of the rotary embossing device, the stamping tools, the transport device and the upstream transport system are each operated at approximately constant speeds. This makes it possible with little control effort to operate the rotary embossing device at high speed, thereby obtaining a high output of the rotary embossing device.

In a particularly advantageous embodiment of the invention, the embossing tools and the upstream transport system are operated at approximately constant speeds. However, the transport speed of the transport device follows a speed profile specified by the control unit. Thus, a respective printing material can be taken over, for example, with the transport speed of the upstream transport system, subsequently accelerated for synchronization or decelerated and adapted to the speed of the die and male prior to transfer to the rotary embossing tools. The substrate is gently transported, kept low forces on the sheet in the transport direction and marks avoided by the belts of the transport device.

The invention further relates to a method for operating a rotary embossing device. The data acquired by the means for determining the rotational speed of the die and the position of the punches of the die, the sensor for determining the position of a transported printing material in the area of the upstream transport system and the means for determining the transport speed of the printing material in the transport system are taken over by the control device , Further, the embossing position of a printing material is entered into the control device. This may be, for example, the distance of the leading edge of an area to be imprinted from the leading edge of the printing material, which the machine operator inputs via a generally known interface. Based on these data, the control device calculates the necessary transport speed of the transport device for synchronizing the printing material with respect to its embossing position relative to the punches of the male part. In order to achieve the necessary transport speed of the transport device, the electric motor of the transport device is controlled by the control device accordingly.

With regard to further advantageous embodiments of the invention, reference is made to the dependent claims and the description of an embodiment with reference to the accompanying drawings.

Fig. 1

den Aufbau einer Faltschachtelklebemaschine mit erfindungsgemäßer Rotationsprägeeinrichtung

Fig. 2a

eine erfindungsgemäße Rotationsprägeeinrichtung

Fig. 2b

eine Detailansicht einer Patrize

Fig. 2c

einen Faltschachtelzuschnitt vor dem Prägen

Fig. 2d

einen Faltschachtelzuschnitt nach dem Prägen.

The invention will be explained in more detail with reference to an embodiment. In a schematic representation:

Fig. 1

the structure of a Faltschachtelklebemaschine with inventive rotation embossing device

Fig. 2a

a rotary embossing device according to the invention

Fig. 2b

a detailed view of a patrix

Fig. 2c

a folding carton blank before embossing

Fig. 2d

a carton blank after embossing.

Fig. 1 shows a Faltschachtelklebemaschine 1 with a Rotationsprägeeinrichtung invention 10 Faltschachtelzuschnitte 2 are transported by a feeder in the transport direction T by the Faltschachtelklebemaschine 1 from an upstream transport system 3, a transport device 13 through the rotary embossing device 10 to a boom. The rotary embossing device 10 has a male part 11 and a die 12 for introducing embossments into the folding box blanks 2. The folding box blanks 2 are conveyed with a board pitch A, also referred to as a section length, at the speed vF through the upstream transport system 3 and then to a transport device 13 passed, which accelerates or decelerates a respective folding carton blank 2 to the speed vT. This speed change causes a synchronization of the carton blank 2 with the embossing tools 11, 12 (see also Fig. 2b-d ), ie, the front edge 211, seen in the transporting direction T, of a surface to be provided with an embossment 22 at the position 21 of the printing substrate 2 is synchronized relative to the stamping process 111 of the male part 11 that first becomes effective during the embossing process. Subsequently, this process is referred to as synchronization of the printing material 2 with respect to its embossing position 21 relative to the punches 110 of the male part 11.
In the contact line of male part 11 and folding carton blank 2 during the embossing process, the male part 11 has the speed vP. In the contact line of die 12 with folding box blank 2 during the embossing process, the die 12 has the speed vM. During the embossing process, the speeds of die vM, male vP and Faltschachtelzuschnitt have the same amount, so that there is no relative movements between tools 11, 12 and Faltschachtelzuschnitt 2 and thus markings of Faltschachtelzuschnitts be avoided. To do this you need to patrote 11 and die 12 are relatively synchronized with respect to their speed. Further, male and female mold 11 12 must be synchronized relative to each other with respect to their angular position, ie it must be ensured that the punch 110 of the male part 11 can dive into holes of the die 12. Do Patrize 11 and die 12 each have their own embossing tool drive so the synchronization is preferably electronically. If the male part 11 and the female part 12 are driven by a common embossing tool drive, the synchronization takes place mechanically, for example by coupling the male part 11 and the female part 12.

Fig. 2a shows the rotary embossing device 10. A folding carton blank 2 is transported by an upstream transport system 3 in the transport direction T. Before the folding carton blank 2 leaves the upstream transport system 3, the position of the folding carton blank 2 is determined by a sensor 17, for example by the detection of the front edge of the folding carton blank 2. For example, the front edge of the folding carton blank 2 is detected. At the same moment, the transport speed of the folding box in the upstream transport system is determined by a rotary encoder of the transport system 16. The acquired information is forwarded via data lines to a control device 18. From the upstream transport system 3, the folding box blank 2 is transferred to a transport device 13. The transport device 13 has an upper conveyor belt 131 and a lower conveyor belt 132. Clamped between two conveyor belts 131, 132, a folding carton blank 2 is transported further at the speed vT. The conveyor belts 131, 132 are driven by at least one electric motor 14. This is controlled by the control device 18. From the transport device 13, a respective folding box blank 2 is transferred to the rotary tools 11, 12 and experiences by the interaction of the male part 11 and die 12 an embossing. The male part 11 is equipped with a rotary encoder 15 which is used to detect the rotational speed of the male part 11 and to detect the position of the punches 110 (in FIG Fig. 2a not shown) of the male part 11 is used. The acquired information is forwarded to the control device 18 via a data line. The control device 18 is connected to an interface via which the machine operator can enter the embossing position 21 on a folding carton blank 2. Based on the provided Information calculates the controller 18, the target speed of the carton in the transport device so that a synchronization of the carton blank 2 relative to the embossing dies 11, 12 takes place by the transport device 13.

In an alternative embodiment, which is not shown, may be located at the position of the upstream transport system 3, alternatively, a feeder for applying Faltschachtelzuschnitten 2. Integrated into the feeder are then also a sensor 17 and a means for determining the transfer speed of Faltschachtelzuschnitte 2 from the feeder to the transport device 13, analogous to the encoder of the transport system 16. The synchronization of embossing position 21 of Faltschachtelzuschnitts 2 relative to the punches 110 of the male 11th takes place as described above. To the rotary embossing device 10 can either further processing stations with a subsequent boom or directly connect a boom.

In a further alternative embodiment not shown, the transport device 13 has a sensor which detects the position of a folding carton blank 2 transported by the conveyor belts 131 and 132, for example by detecting the front edge of the folding carton blank 2. The speed of the folding carton blank 2 corresponds to the time of detection the speed of the conveyor belts 131, 132 and is determined by the control of the electric motor 14 and thus known. The position of the punches 110 of the male part 11 and the rotational speed of the male part 11 are determined by a rotary encoder 15 as described above. This information is in each case transmitted to the control device 18, which calculates therefrom the acceleration of the conveyor belts 131 and 132 and thus of the folding box blank 2 necessary for the synchronization of embossing position 21 of the folding box blank 2 relative to the punches 110 of the male part 11. An advantage of this solution is that all relevant components are arranged within the rotary embossing device 10 and this can be used as a module. This integration into a Faltschachtelklebemaschine 1 is easily possible.

Fig. 2b shows a detail of the male part 11, namely the punch 110 of the male. The front edge 113 seen in the direction of rotation is formed by the one or more stamps 111 which become effective during the stamping process, and the rear edge 114 is formed by the last impression stamping die 112 or stamping process. The die 12 (not shown here) represents the negative mold of the male part 11 and has recesses which receive the punches 110, 111, 112 of the male. In Fig. 2c a folding carton blank 2 is shown, which is moved in the transport direction T and wherein the embossed position 21 is indicated a to be provided with an embossment 22 surface. The area to be provided with an embossment 22 is delimited by the front edge 211 and the rear edge 212. During the embossing process, the leading edge of the punches 113 is imaged onto the leading edge of the imprint 211 and the trailing edge of the punches 114 is imaged onto the trailing edge of the imprint 212. By the in Fig. 2a illustrated and described above, a synchronization takes place, ie a positioning of the carton blank 2 with its embossing position 21 relative to the punches 110 of the male part 11. The result of the embossing process is in Fig. 2d The folding carton blank 2 was embossed 22 at the original embossing position 21.

LIST OF REFERENCE NUMBERS

1

gluer

2

folding box

3

upstream transport system

10

Rotary embosser

11

punch

12

die

13

transport means

14

electric motor

15

Rotary encoder male

16

Encoder transport system

17

sensor

18

control device

21

embossing position

22

embossing

110

Stamp of the patrix

111

first stamp

112

last stamp

113

Leading edge of the stamp

114

Trailing edge of the stamp

131

upper conveyor belt

132

lower conveyor belt

211

leading edge of the surface to be imprinted

212

back edge of the area to be embossed

vP

Speed male

vM

Speed die

vF

Speed folding carton in the transport system

vT

Speed folding carton in the transport device

A

carton division

Claims (11)

Rotational embossing device (10) with two rotating embossing tools, formed by a male part (11) with punches (110) and a die (12), with at least one embossing tool drive for introducing embossments (22), in particular braille, in printing materials (2), in particular folding carton blanks,
characterized,
in that the rotary embossing device (10) has a transport device (13) for transporting the printing materials (2), which is located upstream of the embossing tools (11, 12) and has a drive (14) independent of the at least one embossing tool drive, and in that a change in the Transport speed (vT) of the transport device (13) of the printing material (2) with respect to its embossing position (21), with respect to the front edge (211) or the rear edge (212) of the embossed surface, relative to the first (111) or the last stamp (112) becomes effective during the stamping process. Rotary embossing device according to claim 1,
characterized,
that the transport device (13) of the rotary embossing device (10) is preceded by a transport system (3) which has a drive independent of the embossing tool drive and the drive of the transport device. Rotary embossing device according to claim 1 or 2,
characterized,
that the drive of the transport means (13) by an electric motor (14) is formed. Rotary embossing device according to one of claims 2 to 3,
characterized,
in that the rotary embossing device (10) has a means (15) for determining the rotational speed of the male part (11) and the position of the punches (110) of the male part (11), and in that the upstream transport system (3) has at least one Sensor (17) for determining the position of a transported substrate and a means (16) for determining the transport speed (vF) of the printing material (2) has. Rotary embossing device according to claim 4,
characterized,
in that the means (15, 16) are rotary encoders or sensors. Rotary embossing device according to claim 4 or 5,
characterized,
in that means (15, 16), sensor (17) and electric motor (14) are connected via data lines to a control device (18). Rotary embossing device according to one of claims 1 to 6,
characterized,
that the transport device (13) having a lower (132) and an upper (131) transport belt has, between which the printing material (2) is clamped. Rotary embossing device according to one of claims 2 to 7,
characterized,
that embossing tools (11, 12), transport device (13) and upstream transport system (3) are operated at approximately constant speeds. Rotary embossing device according to one of claims 2 to 7,
characterized,
that embossing tools (11, 12) and upstream transport system (3) are operated at approximately constant speeds, and that the transport speed of the transport device (VT) a predetermined by the control unit (18) velocity profile follows. Method for operating a rotary embossing device according to one of claims 6-9,
characterized,
in that the data acquired by the means (15, 16) and the sensor (17) are taken over by the control device (18), the embossing position (21) of a printing material (2) is input to the control device (18), the control device (18 ) the necessary transport speed (vT) of the transport device (13) for synchronization of the printing material (2) with respect to its embossed position (21) relative to the punches (110) of the male part (11) calculated and the electric motor (14) of the transport device (13) accordingly controls. Folding box gluing machine (1) with a rotary embossing device (10) according to one of claims 1 to 9.

Images