EP4389315A1

EP4389315A1 - Rotary punching device and method for controlling displacement of a first shaft relative to a second shaft in a rotary punching device

Info

Publication number: EP4389315A1
Application number: EP22216021.0A
Authority: EP
Inventors: Emil Boe Sørensen
Original assignee: Ceetec AS
Current assignee: Ceetec AS
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2024-06-26

Abstract

The present invention relates to a rotary punching device (1) for rotational machining of a material sheet (10). The rotary punching device (1) comprises a first shaft (20) rotationally activated by driving means (24), and a second shaft (30) arranged in parallel to the first shaft (20). The first shaft (20) and the second shaft (30) comprise a first tool (23) and a second tool (33) respectively. The rotary punching device (1) further comprises coupling means (40) configured for synchronizing rotation of the first shaft (20) and rotation of the second shaft (30) in an opposite direction.The rotary punching device (1) further comprises displacement means (50) for displacing the first shaft (20) between an engagement position (51) and a disengagement position (52) relative to the second shaft (30). The first and second tools (23, 33) are configured for receiving and rotary punching the material sheet (10) when in the engagement position (51). The rotary punching device (1) further comprises a controller (60) controlling the displacement means (50) and/or the velocity of the first shaft (20) based on received positioning data (65) concerning the position of the material sheet (10).

Description

Field of the Invention

The present invention relates to a rotary punching device for rotational machining of a material sheet. The rotary punching device comprises a first shaft, rotationally activated by driving means, and a second shaft arranged in parallel to the first shaft. The first shaft and the second shaft comprise a first tool and a second tool respectively. The rotary punching device further comprises coupling means configured for synchronizing rotation of the first shaft and rotation of the second shaft in an opposite direction.
The rotary punching device further comprises displacement means for displacing the first shaft between an engagement position and a disengagement position relative to the second shaft. The first and second tools are configured for receiving and rotary punching the material sheet when in the engagement position. The rotary punching device further comprises a controller controlling the displacement means and/or the velocity of the first shaft based on received positioning data concerning the position of the material sheet.

Background of the Invention

Devices for rotational machining a material, often a material sheet, are used in machining operations such as stamping, embossing, blanking, or punching of the material sheet. Rotational machining devices often have two parallel tools each rotating around a tooling axis connected by one or more mutual engagement means enabling synchronized rotation of the two tools. In prior art, the distance between the two parallel tools may be adjusted to adapt to different material thicknesses, to compensate for wear and tear of the tools, inserting material, or when exchanging the tools.
The rotational machining devices known from the art can create continuous machining patterns, however, it is not possible to create variations in the distance between patterns without having to reconfigure the machine altogether.

Object of the Invention

One object of the present invention is to provide a rotary punching device with controlled tool engagement for rotational machining a material sheet and a method for controlling the tool engagement.
A further objective is to achieve optimized operation of a rotary punching device by handling a continuous line of material sheets with controlled tool engagement and tool disengagement.
Yet a further objective is to achieve precision in controlling tool engagement and tool disengagement for minimizing wear of the tools, and for enabling both a great variation and a fast change in tooling patterns.

Description of the Invention

One object of the invention is achieved by a rotary punching device for rotational machining of a material sheet.
The rotary punching device comprises:

a first shaft connected to driving means configured for activating the rotation of the first shaft around a longitudinal centre axis of the first shaft, the first shaft comprising a first tool;
a second shaft arranged in parallel to the first shaft, the second shaft comprising a second tool;
coupling means configured for connecting the first shaft to the second shaft such that rotation of the first shaft causes the second shaft to rotate around a longitudinal centre axis of the second shaft in a direction opposite from the rotation of the first shaft;
displacement means for displacing the first shaft between an engagement position and a disengagement position relative to the second shaft while maintaining synchronisation between the first and second tools, wherein the first and second tools are configured for receiving and rotary punching the material sheet between the first and the second tool when in the engagement position; and
a controller for receiving positioning data concerning the position of the material sheet in relation to the position of the first and second tools, wherein the controller based on the received positioning data controls the displacement means and/or the velocity of the first shaft.

Rotary punching may cover a variety of machining processes such as punching, blanking, stamping, or embossing.
Over time, the tools may need to be repaired or replaced with a similar tool because of wear and tear caused by the process of machining the material sheet. During maintenance or replacement of the tools, the first shaft may be in a maximal distance position, having a maximal distance to the second shaft.
The first tool may comprise a plurality of machining means, such as punches, and the second tool may comprise a plurality of complementarily shaped machining means, such as holes or indents.
The shape of the machining means may define the punching pattern and/or machining process.
The first tool may comprise two or more types of machining means enabling the material sheet to receive two or more different machining processes at the same time. Likewise, the second tool comprises an equal amount of machining means types shaped to complement the types of machining means of the first tool. The first tool, and the second tool machining means shaped to complement the first tool, may for instance comprise a combination of two or more types of machining means such as punching, stamping, embossing, or blanking.
The coupling means ensure that the rotation of the second shaft is synchronized with the rotation of the first shaft. The coupling means may further ensure that the first shaft and the second shaft is synchronized regardless of whether the first shaft is in the engagement position, disengagement position, maximal distance position, or anywhere in-between.
By maintaining synchronization, the tools last longer thus minimizing the wear and tear caused by unalignment between the machining means of the first tool and the complementary machining means of the second tool.
The coupling means causes the second shaft to rotate in a direction opposite from the first shaft and may thereby drive the material sheet forward.
The controller controls the first shaft between the engagement position, configured for rotary punching material sheets, and the disengagement position, configured for allowing the material sheet to freely pass the tools without machining.
The rotary punching device enables rotary punching over a variable length of one or more material sheets, thereby defining a rotary punching section.
The rotary punching device may rotary punch a continuous line of material sheets with the same or varying lengths. Controlling the first shaft between the engagement position and the disengagement position creates punching segments in the material sheet. The punching segments comprise punching patterns when in the engagement position and breaks in between the segments when in the disengagement position. The controller determines both the variable length of the punching pattern in each punching segment and a variable distance between each punching segments. The controller enables both the lengths of the punching patterns and the distance between each segment to vary greatly without having to stop the rotary punching device.
The operation of rotary punching a continuous line of individual material sheets is greatly optimized by controlling the shaft between the engagement position and the disengagement position, thus creating variable breaks in-between the punching segments, while the material sheet continues through the rotary punching device at an unchanged speed and without stopping the rotary punching device.
In one aspect of the rotary punching device, one punching segment may extend over the length of one or more material sheets.
In another aspect of the rotary punching device, one material sheet may comprise one or more punching segments.
By switching between the engagement position and the disengagement position, the first and second tool may create flying cuts in the material sheet.
The material sheet may be driven by the roll forming device connected to the rotary punching device. The material sheet may also be driven by an in-feeder configured for feeding the material sheets into the rotary punching device.
The positioning data may be collected using data collection means such as a measuring wheel, a sensor, or a laser, configured for sensing the movement, the beginning, and the end of the material sheet. In an aspect, the data collection means may be placed at the beginning of the roll forming line, for instance at the in-feeder.
The engagement position of the first shaft may be dependent on the thickness of the material sheet to ensure that the rotary punching device can adapt to material sheets with different thicknesses.
In one aspect, the first shaft and the second shaft may be substantially parallel in both the engagement position and in the disengagement position.
An advantage of the first shaft being connected to the driving means is the ability to precisely monitor and control the position and movement of the first tool.
The driving means may be an electric motor.
The scraps created when punching the material sheet may be collected in the indents in the second tool and be released when the indent is downwards facing.
In an aspect, the second tool may comprise a groove for transferring the scraps from the punching away from the rotary punching device.
In one embodiment, the displacement means may be configured for displacing the first shaft substantially parallel to the second shaft. Thus, the first shaft remains parallel to the second shaft in all positions.
In one embodiment, the rotary punching device may further comprise at least one fixture configured for suspending the first shaft.
The fixture may enable the first shaft to be displaced relative to the second shaft in a controlled manner while remaining substantially parallel to the second shaft.
In one aspect, the rotary punching device may comprise a single fixture configured for displacing the first shaft between an engagement position and a disengagement position while remaining substantially parallel to the second shaft.
In another aspect, the rotary punching device may comprise to more fixtures.
In one embodiment of the rotary punching device, each of the at least one fixtures may be connected to displacement means via a spindle and a ball screw. The at least one fixture may be actuated by the spindle and the ball screw and being configured for displacing the first shaft between an engagement position and a disengagement position relative to the second shaft.
In one embodiment of the rotary punching device, the displacement means may comprise one or more actuators. The one or more actuators may be an electric motor such as, but not limited to, a servo motor, a linear motor or a stepper motor. The electric motor may be electronically controlled by the controller.
In one embodiment, the first shaft may further comprise first tool engaging means configured for releasably connecting to the first tool. The second shaft may comprise second tool engagement means configured for releasably connecting to the second tool.
The first and second tools are releasably attached, respectively, to the first and second tool engagement means to enable each of the tools to be removed and replaced by another tool.
The tool engagement means may be able to connect with a variety of different tools to enable punching, blanking, stamping, or embossing of the material sheet.
In an aspect, the tool engagement means may be bolts and nuts.
In one embodiment of the rotary punching device, the first shaft may be suspended by two fixtures. The displacement means may be configured for synchronous actuating the two fixtures.
In one aspect, the displacement means may comprise one actuator for each fixture, wherein the two actuators synchronically displace each of the two fixtures.
In another aspect, the displacement means may comprise one actuator configured for synchronically displacing the two fixtures
In one embodiment of the rotary punching device, the first and second tools may enable machining such as stamping, embossing, blanking or punching of the material sheet.
In one embodiment of the rotary punching device, the first tool and the second tool may be male and female dies. The male die may be a male mould with cutting punches. The female die may be a female mould with cutting holes or indentations.
In one embodiment of the rotary punching device, the coupling means may be a toothed wheel, a gear wheel, a belt, or a chain.
In an aspect, the coupling means may comprise a toothed wheel on the first shaft and a toothed wheel on the second shaft, wherein the two toothed wheels remain engaged in the engagement position, the disengagement position, and in the maximal distance position. Using two mutually engaged toothed wheels is limited by the length of the teeth and may enable a displacement distance of between 5mm and 10mm from the engagement position to the maximal distance position.
In another aspect, the coupling device may further comprise a toothed wheel on an intermediate shaft configured for engaging the toothed wheel on the second shaft. A belt drive may connect the toothed wheel on the intermediate shaft and/or the second shaft with the toothed wheel on the first shaft. Using an intermediate shaft may enable a large maximal distance position of the first shaft relative to the second shaft. A large maximal distance position may enable use of a first tool with elongated machining means extending radially from the first shaft and a second tool shaped to complement the first tool.
In one embodiment of the rotary punching device, the controller controls the displacement means between the engagement position and the disengagement position and/or the velocity of the first shaft based on a predefined machining pattern.
The controller controls the first shaft between the engagement position, configured for rotary punching the material sheet based on a predefined machining pattern, and the disengagement position, configured for allowing the material sheet to freely pass the tools without machining thereby creating a break between punching patterns. The rotary punching device enables rotary punching over a variable length of one or more material sheets, thereby creating a punching segment based on the predefined pattern. The controller determines both the variable length of each rotary punching section and a variable distance between each rotary punching section based on the predefined punching pattern.
In one embodiment, the rotary punching device may further comprise alignment means for determining a rotational position relative to an initial start position of the first tool.
The initial position of the first tool defines where the first punch or punches of the first tool engages the material sheet when in the engagement position.
Precision in the rotational position of the tools when first engaging the material sheet after having been in the disengagement position minimizes the wear and tear caused by unalignment between the first tool and the initial start position of the first punch or punches.
The initial start position of the first tool may be essential when the first shaft is displaced from the disengagement position to the engagement position as it defines the starting point of a punching segment.
The alignment means may be placed on one of the male die cutting punches.
A further objective of the invention is achieved by a method for displacing a first shaft relative to a second shaft in a rotary punching device according to the invention. The method comprises acts of

receiving in the controller positioning data concerning the position of a material sheet relative to the position of the first and second tools;
receiving the material sheet between the first and second tools; and
adjusting the position of the first shaft relative to the second shaft between the engagement position and the disengagement position based on the received position data.

The first and second shaft may follow the velocity of the material sheet running through the rotary punching machine when the first shaft is in the disengagement position.
Depending on the positioning data, when in the disengagement position, the velocity of the first and second shaft may be adjusted such that the first tool is in an initial start position when the first tool is switched into the engagement position.
The correct position of the first tool when switching from the disengagement position to the engagement position is a position where a first part of the machining means is substantially perpendicular to the part of the material sheet intended to receive the beginning of the first punching segment.
The adjustment may be realized by increasing or decreasing the velocity of the first shaft relative to the velocity of material sheet travelling through the rotary punching device such that the position of the first tool is ready for engaging the material sheet when the first tool is switched to the engagement position.
A further objective of the invention is achieved by a method for rotary punching a material sheet in a rotary punching device. The method comprises acts of

displacing the first shaft relative to the second shaft; and
setting a velocity of the first shaft based on the received position data and/or a predefined machining pattern.

In one embodiment of the method for rotary punching, a material sheet in a rotary punching device, when in the disengagement position a rotational position of the first tool, may be aligned relative to an initial start position of the first tool. The initial position of the first tool defines where the first punch or punches of the first tool engage the material sheet when in the engagement position.
An advantage of aligning the rotational position of the first tool relative to the initial start position of first tool is making sure that the first punch created in the material sheet is a full punch, thereby avoiding that only a part of the first and second tools engages the material sheet when starting the punching pattern. Another advantage is minimizing the wear and tear of the tools thus minimizing the environmental impact as each tool can be used for longer.

Description of the Drawing

Various examples are described hereinafter with reference to the figures. Like reference numerals refer to like elements throughout. Like elements will, thus, not be described in detail with respect to the description of each figure. It should also be noted that the figures are only intended to facilitate the description of the examples. They are not intended as an exhaustive description of the claimed invention or as a limitation on the scope of the claimed invention. In addition, an illustrated example need not have all the aspects or advantages shown. An aspect or an advantage described in conjunction with a particular example is not necessarily limited to that example and can be practiced in any other examples even if not so illustrated, or if not so explicitly described.
An embodiment of the invention is described in the following with reference to the figures, where:

Figure 1 illustrates the rotary punching device according to the invention;
Figure 2 illustrates the first and second tool of the rotary punching device;
Figure 3 illustrates the first tool in the engagement position and in the disengagement position.

Detailed Description of the Invention

Rotary punching device	1
Material sheet	10
First shaft	20
Longitudinal centre axis (first shaft)	21
First tool engaging means	22
First tool	23
Driving means	24
Second shaft	30
Longitudinal centre axis (second shaft)	31
Second tool engagement means	32
Second tool	33
Coupling means	40
Displacement means	50
Engagement position	51
Disengagement position	52
Controller	60
Positioning data	65
Fixture	70
Spindle	71
Ball screw	72
Method for displacing a first shaft	100
Receiving in the controller	200
Receiving the material sheet	300
Adjusting	400
Method for rotary punching a material sheet	500
Displacing	600
Setting	700
Aligning	800

An embodiment of the invention is explained in the following detailed description. It is understood that the invention is not limited in its scope to the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways. The term "and/or" includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing particular examples only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms, including "at least one," unless the content clearly indicates otherwise. "At least one" is not to be construed as limiting "a" or "an." It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Like reference numerals refer to like elements throughout the specification. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, examples described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims. Some of the parts which are not associated with the description may not be provided in order to specifically describe examples of the present disclosure.
Figures 1 and 2 show an embodiment of a rotary punching device 1 for rotational machining of a material sheet 10. The rotary punching device 1 comprises a first shaft 20 and a second shaft 30.
The first shaft 20 is connected to driving means 24 configured for activating the rotation of the first shaft 20 around a longitudinal centre axis 21 of the first shaft 20. The first shaft 20 further comprises first tool engaging means 22 configured for releasably connecting to a first tool 23. The first tool 23 is a male die or mould with punches.
The second shaft 30 is arranged in parallel to the first shaft 20. The second shaft 30 comprises second tool engagement means 32 configured for releasably connecting to a second tool 33. The second tool 33 is a female die or mould with indents or holes.
The first tool 23 and the second tool 33 enable machining such as stamping, embossing, blanking or punching of the material sheet 10 depending on the shape of the tools.
The rotary punching device 1 comprises coupling means 40 configured for connecting the first shaft 20 to the second shaft 30. The coupling means 40 ensures that rotation of the first shaft 20 causes the second shaft 30 to rotate around a longitudinal centre axis 31 of the second shaft 30 in a direction opposite from the rotation of the first shaft 20.
The coupling means may be a toothed wheel, a gear wheel, a belt, or a chain.
The rotary punching device 1 comprises displacement means 50 for displacing the first shaft 20 between an engagement position 51 and a disengagement position 52 relative to the second shaft 30. The first tool 23 and the second tool 33 remain synchronized both when the first shaft 20 is in the engagement position 51 and in the disengagement position 52. The first and second tools 23, 33 are configured for receiving and rotary punching the material sheet 10 between the first tool 23 and the second tool 33 when the first shaft is in the engagement position 51.
The displacement means 50 are configured for displacing the first shaft 20 substantially parallel to the second shaft 30.
The rotary punching device 1 comprises a controller 60 for receiving positioning data 65 concerning the position of the material sheet 10 in relation to the position of the first tool 23 and the second tool 33.
The controller 60 controls the displacement means 50 between the engagement position 51 and the disengagement position 52 and/or controls the velocity of the first shaft 20 based on the received positioning data 65 and optionally based on a predefined machining pattern.
The rotary punching device 1 further comprises two fixtures 70 configured for suspending the first shaft 20. Each of the two fixtures 70 are connected to displacement means 50 via a spindle 71 and a ball screw 72. The two fixtures 70 are actuated by the spindle and the ball screw causing the first shaft 20 to be displaced between the engagement position 51 and the disengagement position 52 relative to the second shaft 30.
The displacement means 50 comprises one or more actuators (not illustrated). In a second embodiment (not illustrated) the first shaft 20 is suspended by two fixtures 70 and the displacement means 50 is configured for synchronous actuating the two fixtures 70. In a third embodiment (not illustrated) the first shaft is suspended by one fixture 70 connected to displacement means 50 via a spindle 71 and a ball screw 72 while the first shaft 20 remain parallel to the second shaft 30 in both the engagement position 51 and the disengagement position 52.
The rotary punching device 1 further comprises alignment means for determining a rotational position relative to an initial start position of the first tool 23.
Figure 3a shows the first shaft 20 in the disengagement position 52 wherein the rotary velocity of the first shaft 20 is substantially equal to the velocity of the material sheet 10 travelling through the rotary punching device 1.
The controller 60 displaces the first shaft 20 relative to the second shaft 20 in the rotary punching device 1 based on received positioning data 65 concerning the position of the material sheet 10 relative to the position of the first tool 23 and the second tool 33. The material sheet 10 is then received between the first tool 23 and the second tool 33 and the position of the first shaft 20 relative to the second shaft 30 is adjusted between the engagement position 51 and the disengagement position 52 based on the received position data 65.
The material sheet 10 is rotary punched in the rotary punching device by displacing the first shaft 20 relative to the second shaft 30 and setting a velocity of the first shaft 20 based on the received position data 65 and/or a predefined machining pattern.
The controller 60 controls whether the initial start position of the first tool 23 is going to align with the beginning of the first punch when switching from the disengagement position 52 to the engagement position 51. If the initial start position is not going to be aligned with the beginning of the first punch when going into the engagement position 52, the controller 60 adjusts the rotary velocity of the first shaft 20 relative to the velocity of the material sheet 10 travelling through the rotary punching device 1.
Figure 3b shows the first shaft 20 in the engagement position 51 rotary punching the material sheet 10.
Figure 4a describes a method 100 for displacing a first shaft 20 relative to a second shaft 20 in a rotary punching device 1. The method 100 comprises an act of receiving 200 in the controller 60 positioning data 65 concerning the position of a material sheet 10 relative to the position of the first tool 23 and the second tool 33.
The method 100 comprises an act of receiving 300 the material sheet 10 between the first tool 23 and the second tool 33.
The method 100 comprises an act of adjusting 400 the position of the first shaft 20 relative to the second shaft 30 between the engagement position 51 and the disengagement position 52 based on the received position data 65.
Figure 4b describes a method 500 for rotary punching a material sheet 10 in a rotary punching device 1. The method 500 comprising an act of displacing 600 the first shaft 20 relative to the second shaft 30 according to the method (100) and an act of setting 700 a velocity of the first shaft 20 based on the received position data 65 and/or a predefined machining pattern.
The method may further comprise an act of aligning 800, when in the disengagement position 52, a rotational position of the first tool 23 relative to an initial start position of the first tool 23.

Claims

A rotary punching device (1) for rotational machining of a material sheet (10), the rotary punching device (1) comprises:
- a first shaft (20) connected to driving means (24) configured for activating the rotation of the first shaft (20) around a longitudinal centre axis (21) of the first shaft (20), the first shaft (20) comprising a first tool (23);

- a second shaft (30) arranged in parallel to the first shaft (20), the second shaft (30) comprising a second tool (33);

- coupling means (40) configured for connecting the first shaft (20) to the second shaft (30) such that rotation of the first shaft (20) causes the second shaft (30) to rotate around a longitudinal centre axis (31) of the second shaft (30) in a direction opposite from the rotation of the first shaft (20);

- displacement means (50) for displacing the first shaft (20) between an engagement position (51) and a disengagement position (52) relative to the second shaft (30) while maintaining synchronisation between the first and second tools (23, 33), wherein the first and second tools (23, 33) are configured for receiving and rotary punching the material sheet (10) between the first and the second tool (23, 33) when in the engagement position (51); and

- a controller (60) for receiving positioning data (65) concerning the position of the material sheet (10) in relation to the position of the first and second tools (23, 33), wherein the controller (60) based on the received positioning data (65), controls the displacement means (50) and/or the velocity of the first shaft (20).
The rotary punching device (1) according to claim 1, wherein the displacement means (50) are configured for displacing the first shaft (20) substantially parallel to the second shaft (30).
The rotary punching device (1) according to claim 1 or 2 further comprises at least one fixture (70) configured for suspending the first shaft (20).
The rotary punching device (1) according to claim 2 or 3, wherein each of the at least one fixtures (70) are connected to displacement means (50) via a spindle (71) and a ball screw (72), wherein the at least one fixture (70) is actuated by the spindle and the ball screw and is configured for displacing the first shaft (20) between the engagement position (51) and the disengagement position (52) relative to the second shaft (30).
The rotary punching device (1) according to any of the preceding claims, wherein the displacement means (50) comprises one or more actuators.
The rotary punching device (1) according to any of the proceeding claims, wherein the first shaft (20) further comprises first tool engaging means (22) configured for releasably connecting to the first tool (23) and wherein the second shaft (30) comprises second tool engagement means (32) configured for releasably connecting to the second tool (33).
The rotary punching device (1) according to any of the proceeding claims, wherein the first shaft (20) is suspended by two fixtures (70) and wherein the displacement means (50) are configured for synchronously actuating the two fixtures (70).
The rotary punching device (1) according to any of the preceding claims, wherein the first and second tools (23, 33) enable machining such as stamping, embossing, blanking or punching of the material sheet (10).
The rotary punching device (1) according to any of the preceding claims, wherein the first tool (23) and the second tool (33) are male and female dies.
The rotary punching device (1) according to any of the preceding claims, wherein the coupling means are a toothed wheel, a gear wheel, a belt, or a chain.
The rotary punching device (1) according to any of the preceding claims, wherein the controller (60) controls the displacement means (50) between the engagement position (51) and the disengagement position (52) and/or the velocity of the first shaft (20) based on a predefined machining pattern.
The rotary punching device (1) according to any of the preceding claims, wherein the rotary punching device (1) further comprises alignment means for determining a rotational position relative to an initial start position of the first tool (23).
Method (100) for displacing a first shaft (20) relative to a second shaft (20) in a rotary punching device (1) according to any of the preceding claims, wherein the method comprises acts of
- receiving (200) in the controller (60) positioning data (65) concerning the position of a material sheet (10) relative to the position of the first and second tools (23, 33);

- receiving (300) the material sheet (10) between the first and second tools (23, 33); and

- adjusting (400) the position of the first shaft (20) relative to the second shaft (30) between the engagement position (51) and the disengagement position (52) based on the received position data (65).
Method (500) for rotary punching a material sheet (10) in a rotary punching device (1) according to claim 1-12, wherein the method comprising acts of
- displacing (600) the first shaft (20) relative to the second shaft (30) according to claim 13; and

- setting (700) a velocity of the first shaft (20) based on the received position data (65) and/or a predefined machining pattern.
Method according to claim 14, further comprising an act of aligning (800) when in the disengagement position (52) a rotational position of the first tool (23) relative to an initial start position of the first tool (23).