[0001] The present invention relates to a device and a method for transferring a flat piece,
in particular a plastic card, from an initial position to a destination position.
[0002] Flat pieces such as plastic cards are used in different technical areas and need
to be treated and in different ways. For example, imaging of the flat piece may be
carried out, a card printer can be used to print an image and/or graphical elements
on the flat piece, a laser may be used for engraving, the flat piece may be laminated,
cured, cut, embossed or otherwise treated.
[0003] One requirement for performing such treatments and manipulations in an efficient
and highly automated manner is that the flat piece is transferred from a supply to
the respective treatment devices reliably and at a high frequency.
[0004] Different methods for transferring flat pieces to a machine have been suggested.
However, there is a need for more efficient and reliable feed-in techniques. Flat
pieces need to be transferred from a supply to treatment devices and provided reproducibly.
[0005] It is the problem of the invention to provide an improved device and method for transferring
a flat piece, in particular a plastic card, from an initial position to a destination
position. In particular, it is one problem of the invention to provide the flat pieces
such that they are positioned reproducibly and reliably at a target position and in
a defined orientation. Also, the transferring process should be flexible for different
positions and/or orientations, while at the same time a consistent timing should be
reached.
[0006] This problem is solved by a device and a method according to the independent claims
of the attached set of claims. Further advantageous embodiments are given in the dependent
claims.
[0007] The device for transferring a flat piece, in particular a plastic card, from an initial
position to a destination position, comprises a holder element for holding the flat
piece and a rotator element, which is rotatable around a rotation axis. The holder
element is swivel-mounted to the rotator element, such that the holder element is
rotatable relative to the rotator element around a swivel axis. When the rotator element
is at a destination rotation angle, the holder element can have a first or a second
holder orientation relative to the rotator element, and, when the rotator element
is rotated from an initial rotation angle towards the destination rotation angle in
a first rotation direction, the holder element reaches the destination position having
the second orientation relative to the rotator element.
[0008] This provides an advantageously simple and reliable mechanic to transfer the flat
piece. By using a rotation of the rotator element to move the holder element with
the respective flat piece, the transfer to the destination position can be linked
to further translation and rotation movements, in order to reach a defined state of
the flat piece.
[0009] In particular, the rotation of the holder element is not driven actively, but passively,
for example by an active rotation of the rotator element. Also, the rotation of the
holder element can be driven indirectly instead of directly from a motor element,
for example by a rotation of the rotator element, which is driven directly by a motor
element.
[0010] In particular, a flat piece extends mainly in one plane. Thus, it has a thickness,
which is at least a factor 10 smaller than its extension perpendicular to the direction
of the thickness. Examples of a flat pieces are plastic cards, sheets of plastic,
paper, metal or other material, mail pieces, or similar objects. The flat piece may
be provided with different shapes, such as an essentially rectangular or round shape.
[0011] At the initial position, the flat piece may be provided by a loading element or a
feeding device. Also, the flat piece may be taken from a supply, such as a stack or
a container with a supply of flat pieces. In general, the flat piece is taken up or
loaded to the holder element at the initial position.
[0012] At the destination position, the flat piece may be presented to a treatment device,
such as a device for imaging or a printer. For example, the flat piece can be fed
onto a transport element, such as a belt or carrier element, in order to transport
the flat piece further. In general, the flat piece may leave or be removed from the
holder piece at the destination position.
[0013] In particular, the swivel axis of the holder element relative to the rotator element
may be different from the rotation axis of the rotator element. In an embodiment,
the swivel axis is oriented parallel to the rotation axis of the rotator element.
[0014] The first and second holder orientation relative to the rotator element may be oriented
opposite to each other, wherein the second holder orientation is reached by a rotation
of 180° around the swivel axis. In further embodiments, the first and second holder
orientation may be defined differently, e.g., by another difference of rotation angle
around the swivel axis.
[0015] Thus, when the flat piece is provided at the destination position and the rotator
element has been rotated to the destination rotation angle, there are at least two
distinct orientations that the holder element - and the flat piece provided therewith
- can have. The device therefore allows for a high flexibility in providing the flat
piece in a defined orientation. In particular two cases can be distinguished, either
flipping the flat piece in the process of transferring it to the destination position,
or not flipping.
[0016] For example, the first and/or second holder orientation may be defined by an angle
between the rotator element and the holder element. For example, a rotator longitudinal
extension may be defined between the rotation axis and the swivel axis; a holder longitudinal
extension may be defined between the swivel axis and the cam roller or along the length
of a card when it is held by the holder element. In particular, the longitudinal axes
of the rotator and holder element may be at a 90° angle in the first and/or second
holder orientation. In particular, the holder element can be flipped with respect
to the rotator element, when it changes between the first and second holder orientation.
Also, a flat piece that is held by the holder element can be flipped together with
the holder element relative to the rotator element.
[0017] The device may be configured such that, when the rotator element is at the initial
rotation angle, i.e., when the holder element is at the initial position, the holder
element has always an initial holder orientation relative to the rotator element,
for example the first holder orientation or another holder orientation.
[0018] On the other hand, the device may be configured such that the holder element can
have either the first or the second holder orientation relative to the rotator element,
when the rotator element is at the destination rotation angle, i.e., when the holder
element is at the destination position. In particular, if other holder orientations
are excluded at these rotation angles, a very clearly defined positioning and orientation
of the flat pieces is achieved. This allows for example two ways of transferring the
flat pieces, namely with and without a flipping action, wherein one side or another
side of the flat piece is presented upwards.
[0019] In an embodiment, the holder element has constraining pieces, which are at least
partially spring-loaded and configured to clamp a flat piece between V-grooves. Such
V-grooves may define a direction, along which an edge of the flat piece is oriented.
By providing such grooves in constraining pieces on opposite sides, the flat piece
may be secured along the direction between these constraining pieces. In particular,
a constraining piece on one side may be fixed, while the opposing one is spring-loaded,
e.g., by a leaf spring.
[0020] In an embodiment, the device comprises a loading element, which is configured to
load the flat piece from the initial position to the holder element. This allows advantageously
providing the flat piece automatically to the holder element.
[0021] A loading element may be configured, for example, to push a flat piece between constraining
pieces of the loading element. Different push mechanisms can be used, for example
utilizing a spring-loaded or motor-driven pusher arm. In particular, the loading element
can be configured to transfer a flat piece from a supply and insert it into the holder
element.
[0022] For example, the loading element pushes a flat piece from a supply towards the holder
element, for example between the above-described constraining pieces.
[0023] In an embodiment, the device further comprises a rotation motor unit, which is configured
to drive the rotation of the rotator element, and a control unit, which is configured
to control the rotation direction, a rotation speed, an amount of rotation and/or
a rotation angle of the rotator element. This allows advantageously automated and
reproducible transfer of the flat pieces.
[0024] In particular, the control unit may be configured to generate a control signal and
transmit the control signal to the rotation motor unit. In response to the control
signal, the rotation motor unit may then initiate a rotation of the rotator element
around the rotation axis in a specific rotation direction and/or at a specific rotation
speed, for a specific amount of rotation and/or to a specific rotation angle of the
rotator element.
[0025] Different motor types may be used, in particular an electric motor such as a stepper
motor. The motor unit may be configured to give a position feedback. If the motor
unit does not give a position feedback, a position sensor and/or a homing sensor may
be provided to detect a specific position of the motor and/or the rotator element.
In particular, the sensor signal may be fed to the control unit, where it is used
for generating the motor control signal.
[0026] In an embodiment, the device is in an initial state or loading state, when the rotator
element has the initial rotation angle, for example when it is facing downwards in
a gravity field. However, other orientations of the rotator element can be used to
define the initial rotation angle.
[0027] In an embodiment, the device is in a destination state, when the rotator element
has the destination rotation angle, for example when it is facing upwards in a gravity
field. However, other orientations of the rotator element can be used to define the
destination rotation angle.
[0028] In another embodiment, the rotator element may be facing upwards at the initial rotation
angle and downwards at the destination rotation angle. Thus, the initial and destination
state can advantageously be defined very easily through the respective rotation angles.
[0029] Also, the holder element may be at the initial position and/or in an initial holder
orientation, when the device is in the initial or loading state. In particular, the
device may be configured to receive a flat piece, when it is in the initial state.
Thus, if a loading element is provided, it may be configured to load the flat piece,
when the device is in the initial state.
[0030] A sensor may be provided in order to sense the current rotation angle of the rotator
element, and/or to sense the current position and/or orientation of the holder element.
Thus, such a sensor may be used to determine the current state of the device, and
the sensor readout may be used to control the device and further devices for providing
or treating the flat pieces.
[0031] In particular, the position of the holder element and a flat piece, respectively,
is at the initial position, when the rotator element has the initial rotation angle
and the device is in the initial state, respectively.
[0032] On the other hand, a destination state or output state or feeding state of the device
may be defined, when the rotator element has the destination rotation angle, in particular
when it is facing upwards.
[0033] For example, the device may be configured to output the flat piece, when it is in
the destination state. Thus, if an outputting element, a pusher element or a feed-out
element is provided, it is configured to output the flat piece, when the device is
in the destination state.
[0034] In particular, the position of the holder element and a flat piece, respectively,
is at the destination position, when the rotator element has the destination rotation
angle and the device is in the destination state, respectively. For example, the destination
position is reached, after the flat piece has been loaded on the device in the initial
state and the rotator element has been rotated to the destination rotation angle in
the first or second rotation direction.
[0035] In an embodiment, when the rotator element is at the initial rotation angle, the
holder element has the first holder orientation relative to the rotator element. A
cam roller is connected to the holder element. Herein, when the rotator element is
rotated towards the destination rotation angle in the first rotation direction, the
cam roller reaches a first limitation stop, such that the holder element is rotated
towards the second orientation relative to the rotator element.
[0036] This configuration allows a very efficient and easy control over the orientation
of the flat piece. Also, the device can be implemented cost-efficiently and robust.
Using a cam to control the movement and in particular the rotation of the holder element
is a very reliable approach, which can easily be adjusted for different uses.
[0037] In an embodiment, the device further comprises at least one orienting member for
keeping the holder element in the first or second holder orientation relative to the
rotator element. Thus, a defined holder orientation is advantageously reached, and
the device can "switch" from one holder orientation to the other. In addition to that,
the holder element may be secured at a defined orientation and/or position, such that
the flat piece is presented in a highly defined and reproducible manner.
[0038] In particular, the first and second holder orientation may be opposite to each other,
i.e., rotated 180° relative to the rotator element.
[0039] In an embodiment, the orienting member comprises a magnetic element, which may be
configured to magnetically keep the holder element in the first or second holder orientation
relative to the rotator element. Thus, the holder element is advantageously fixed
in the first or second holder orientation very easily. A magnetic force between the
holder element and the orienting member serves to temporarily secure a defined holder
orientation relative to the rotator element.
[0040] For example, the holder element may comprise a magnetic material, in particular a
paramagnetic material, which is held by the orienting member with a magnet. On the
other hand, in an inverted configuration, the orienting member may comprise a magnetic
material, in particular a paramagnetic material, which is held by a magnet of the
holder element.
[0041] In further embodiments, the orienting member may comprise another mechanism. For
example, a snap-lock principle and/or spring-loaded elements may be used, wherein
the holder element snaps into a temporarily fixed position with respect to the rotator
element. In particular, the device may be configured such that the snap-lock mechanism
can be opened and the holder orientation can be switched.
[0042] In an embodiment, the cam roller is connected to the holder element such that it
has a fixed position relative to the holder element. For example, the cam roller may
be comprised by or integrated in the holder element. This allows advantageously easy
guidance of the holder movement and orientation by the cam roller.
[0043] In particular, the cam roller may be guided along a cam roller guide. The cam roller
guide may be configured such that it has at least the first limitation stop.
[0044] The first limitation stop may be configured such that it prevents further rotation
of the rotator element in the first rotation direction, when the cam roller abuts
the first limitation stop. In particular, the further rotation may be prevented through
an interaction between the cam roller and the first limitation stop. In addition to
that, further rotation may be prevented through an interaction between the holder
element and the rotator element.
[0045] In an embodiment, when the rotator element is rotated towards the destination rotation
angle in a second rotation direction, the cam roller reaches a second limitation stop,
such that the rotation of the rotator element is stopped. Thus, the device can advantageously
vary the way of presenting the flat piece in the holder element by changing the rotation
direction.
[0046] In particular, the second limitation stop is comprised by the cam roller guide, and
the device is configured such that, when the rotator element is rotated towards the
destination rotation angle in a second rotation direction, in particular opposite
to the first rotation direction, the cam roller reaches the second limitation stop.
[0047] The second limitation stop may be configured such that it prevents further rotation
of the rotator element in the second rotation direction, when the cam roller abuts
the second limitation stop. In particular, the further rotation may be prevented through
an interaction between the cam roller and the second limitation stop. In addition
to that, further rotation may be prevented through an interaction between the holder
element and the rotator element.
[0048] A sensor may be provided for sensing that the cam roller has reached the second limitation
stop. A control signal can be generated and sent to the control unit for controlling
a rotation motor and stopping the rotation.
[0049] In another embodiment, the rotation of the holder element is coupled to the rotation
of the rotator element by a gearing. Thus, a very simple and robust mechanism is provided.
[0050] In particular, the rotation of the holder element can be coupled to the rotation
of the rotator element such that, when the rotator element is rotated, the holder
element is rotated as well.
[0051] Also, the coupling can be such that the rotation direction of the rotator element
also determines the rotation direction of the holder element.
[0052] Also, the rotation speed of the rotator element can determine the rotation speed
of the holder element.
[0053] The gearing can be configured such that a defined relation between the rotation of
the rotator element and the rotation of the holder element have a defined relation
to each other. For example, the holder element can rotate in the same or the opposite
direction as the rotator element. In another example, the holder element can rotate
at a double angular speed as the rotator element, or the rotational speeds can have
another ratio.
[0054] In an embodiment, the holder element is fixed to a holder gearwheel, which engages
with a static gearwheel. In particular, the static gearwheel does not rotate, while
the rotator element and/or the holder element is rotated. While the holder gearwheel
is moved relative to the static gearwheel, a holder rotation can be induced.
[0055] In an embodiment, the static gearwheel is arranged concentric with the rotation axis.
For example, the static gearwheel can be arranged around a sleeve, through which the
rotation axis is running.
[0056] In an embodiment, the holder gearwheel is arranged concentric with the swivel axis.
For example, the holder gearwheel can be fixed to the holder element or the holder
element's axis such that the holder element experiences the same rotation as the holder
gearwheel.
[0057] In an embodiment, the static gearwheel and the holder gearwheel have a transmission
ratio such that a full rotation of the rotator element corresponds to (N+0.5) rotations
of the holder element, wherein N is a natural number.
[0058] For example, the static gearwheel and the holder gearwheel can have a transmission
ratio of 2:3.
[0059] In particular, when the rotator element is rotated 120° around the rotation axis,
the holder element is rotated 180° angle around the swivel axis. On the other hand,
when the rotator element is rotated 240° around the rotation axis, the holder element
is rotated 360° around the swivel axis.
[0060] More generally, the transmission ratio may be configured such that one full rotation
of the static gearwheel corresponds to N+0.5 full rotations of the holder gearwheel,
and thus the holder element.
[0061] Thus, the device can be configured to translate the holder element and the flat piece,
respectively, while at the same time either keeping effectively the same holder orientation
or flipping the holder orientation. To this end, an initial rotation angle of the
rotator element is defined, and a destination rotation angle is defined as 120° in
the first rotation direction or 240° in the second rotation direction. Both destination
rotation angles correspond to the same destination position. While the rotator element
is rotated, the holder element is also rotated either 180°, when choosing the first
rotation direction for the rotator element, or 360°, when choosing the second rotation
direction for the rotator element. Thus, by choosing the first or second rotation
direction, the flat piece in the holder element can be flipped or not flipped during
translation.
[0062] In an embodiment, when the rotator element is rotated in the first rotation direction
and reaches the destination rotation angle, the holder element has essentially the
same holder orientation relative to the rotator element, as when the rotator element
is at the initial rotation angle. In other words, a flat piece, which is held by the
holding element, is not flipped over during a translation from the initial position
to the destination position. The flat piece is therefore advantageously easily moved
from the initial position to the destination position very efficiently.
[0063] In an embodiment, when the rotator element is rotated in the second rotation direction
and reaches the destination rotation angle, the holder element has essentially an
opposite holder orientation relative to the rotator element, as when the rotator element
is at the initial rotation angle. In other words, a flat piece, which is held by the
holding element, is flipped over while the rotator element is rotated in the second
rotation direction, and reaches the destination position through a translation combined
with a rotation compared to the initial position.
[0064] Thus, by changing the rotation direction, the device allows advantageously a simple
and robust choice between flipping the transferred flat piece, or transferring the
flat piece without such a flip or rotation.
[0065] In particular, the opposite orientation relates to a rotation around 180° around
an axis, which extends in the plane of the flat piece or parallel to this plane. For
example, one side that is facing upwards will face downwards in the opposite orientation.
[0066] On the other hand, the device may be configured such that, when the flat piece reaches
the destination position, it is also rotated around another axis, in particular around
an axis perpendicular to the plane of the flat piece.
[0067] In an embodiment, the device further comprises an outputting element, in particular
a pusher element or a feeding element, to output the flat piece from the holder element.
Thus, the flat piece can advantageously be output very easily and without the use
of additional devices.
[0068] In particular, the outputting element is configured to output the flat piece, after
the holder element has reached the destination position.
[0069] The outputting element, which may be configured as a pusher element, can be actuated
by an outputting motor unit, in particular a pusher motor unit. For example, a pushing
motor unit may be configured to rotate a pusher element, which is thereby pivoted
into contact with the flat piece and which pushes the flat pieces out of the holder
element in a defined direction.
[0070] For example, the outputting element may be controlled by a control unit, in particular
the same control unit as a rotation motor.
[0071] In an embodiment, a height difference is provided between the initial and destination
position of the holder element. In particular, the height is defined along an axis,
which may be parallel to an axis of a gravity field. Thus, the device can be advantageously
used to overcome a height difference while the flat piece is presented.
[0072] The height difference may be essentially determined by a distance between the rotation
axis of the rotator element and the swivel axis of the holder element, in particular
if the difference between the initial rotation angle and the destination rotation
angle of the rotator element is 180°. In this the case, for example, the rotator element
may be oriented downwards and the holder element may be at its lowest position in
the initial state, while in the destination state the rotator element is oriented
upwards and the holder element is at its highest position, such that a positive height
difference is overcome. On the other hand, the rotator element can be oriented upwards
and the holder element may be at its highest position in the initial state, while
in the destination state the rotator element is oriented downwards and the holder
element is at its lowest position, such that a negative height difference is overcome.
The height difference may, e.g. be chosen between 15 mm and 60 mm, in particular between
20 mm and 50 mm, in particular between 25 mm and 45 mm, in particular between 30 mm
and 40 mm, in particular at 33 mm.
[0073] The method for transferring a flat piece, in particular a plastic card, from an initial
position to a destination position comprises loading the flat piece on a holder element
at the initial position, and rotating a rotator element, to which the holder element
is swivel-mounted, around a rotation axis from an initial rotation angle to a destination
rotation angle. When the rotator element is at the initial rotation angle, the holder
element has a first orientation relative to the rotator element. When the rotator
element is rotated towards the destination rotation angle in the first rotation direction,
the holder element is rotated towards a second holder orientation relative to the
rotator element.
[0074] In particular, the method is suited to operate the above-mentioned device. Thus,
it has the same advantages as the device for transferring a flat piece, in particular
a plastic card, from an initial position to a destination position.
[0075] The invention is described further on the basis of the attached figures. Therein,
the figures show:
- Fig. 1A to 1C
- schematic drawings of an embodiment of the device;
- Fig. 2
- a perspective view of the embodiment of the device;
- Fig. 3A to 3C
- schematic drawings of angles and measures for controlling the device;
- Fig. 4A and 4B
- a detailed view of the holder element; and
- Fig. 5A and 5B
- another embodiment of the device.
[0076] Turning to
Fig. 1A, a first embodiment of the device is described.
[0077] The device 10 of the embodiment comprises a rotator element 12, which is at one end
mounted rotatably around a rotation axis 12a.
[0078] Also, the device 10 comprises a holder element 14, which is swivel-mounted around
a swivel axis 14a at the end of the rotator element 12 that is opposite the rotation
axis 12a.
[0079] The rotator element 12 has an orienting member 18 attached with two magnetic elements
18a, 18b at opposing sides.
[0080] In the embodiment, the magnetic elements 18a, 18b are configured to hold the holder
element 14 by magnetic force, when the holder element 14 comes close enough towards
or into contact with one of the magnetic elements 18a, 18b. To this end, the holder
element 14 comprises a paramagnetic section, at least in the region where it can come
get close to or into contact with the magnetic elements 18a, 18b.
[0081] In the case shown in Fig. 1A, the holder element 14 has been rotated around the swiveling
axis 14a such that it comes into contact with one of the magnetic elements 18a, where
it is held at a 90° angle relative to the rotator element 12. Thus, when the rotator
element 12 is rotated around the rotation axis 12a, the holder element 14 will remain
at its 90° orientation relative to the rotator element 12, until an external force
releases its magnetic connection to the magnetic element 14a.
[0082] A cam roller 16 is attached at the end of the holder element 14 that is opposite
to the swivel axis 14a. The cam roller 16 is guided by a cam roller guide 20, which
comprises a first 20a and a second limitation stop 20b.
[0083] The device 10 of the embodiment is designed to transmit cards 30 from an intermittent
walking beam transport onto a conveyor belt 50.
[0084] Also, the device of the embodiment is configured to optionally provide a specific
position of a flat piece, in particular a card 30, for visual inspection, before transferring
the card 30 to the conveyor belt 50. In this case, an image of the card 30 is taken,
after it has been brought up to the level of the conveyor belt 50, but before the
card 30 is transferred to it.
[0085] Thus, the device 10 has the functionality to hold the card 30 in position during
visual inspection, and to guide the card 30 during its actual transfer to the conveyor
belt 50.
[0086] In addition to that, the device 10 of the embodiment provides the possibility to
transfer the card 30 in its original orientation to the conveyor belt 50 or to flip
the card 30 to transfer it in an opposite orientation.
[0087] Fig. 1A shows a loading element 40, which is configured to load flat pieces 30, in
this case a card 30, on the holding element 14
via a card guide of the loading element 40. The holding mechanism and the loading are
described in more detail later. In the embodiment, an initial position of the flat
piece 30 or card 30 is defined as the position, where the card is loaded on the holder
element 14.
[0088] Also, Fig. 1A shows an end of a conveyor belt 50, which is configured to transport
the card 30 towards further devices, in particular treatment devices such as a printer.
[0089] In this embodiment, as shown in Fig. 1, there is a height difference h between the
level of the initial position of the card 30 and a destination position at the end
of the conveyor belt 50. In the case of this embodiment, the height difference h is
about 33 mm.
[0090] Turning to
Fig. 1A to 1C, an embodiment of the method to operate the device 10 is described.
[0091] The method starts at an initial state of the device 10, which is shown in Fig. 1A.
Therein, the rotator element 12 is at an initial rotation angle and faces downwards,
while the holder element 14 and the card 30, which is loaded thereon, are at an initial
position. Also, the holder element 14 is held at a first holder orientation relative
to the rotator element 12 by the orienting element 18.
[0092] Fig. 1B shows a case, where the rotator element 12 is rotated counterclockwise around
the rotation axis 12a. Dashed lines show an intermediate position of the assembly,
wherein the rotator element 12 has been rotated ca. 45°. In this case, the cam roller
16 is following the cam roller guide 20 and has not yet reached the first limitation
stop 20a.
[0093] However, when the rotator element 12 is rotated further, the cam roller will abut
the limitation stop 20a. The cam roller guide 20 is configured such that the rotation
of the rotator element 12 can be continued and the cam roller will glide along the
first limitation stop 20a, essentially radially towards the rotation axis.
[0094] Further counterclockwise rotation will cause the holder element 14 to get loose from
the orienting member 18 and to rotate relative to the rotator element 12, such that
it is swiveled around the swivel axis 14a relative to the rotator element 12 into
a second holder orientation, which is opposite to the first holder orientation, relative
to the rotator element 12. At this second holder orientation, the holder element 14
is held again by the orienting member 18, which also prevents further rotation.
[0095] In this embodiment, the rotator element 12 has reached its destination rotation angle,
while it is facing upwards. At this end point, which is shown in Fig. 1B, the device
10 is in the destination state and the card 30 has reached the destination position.
Subsequently, visual inspection can be carried out and the card 30 can be pushed onto
the conveyor belt 50.
[0096] As seen in Fig. 1A and 1B, the card 30 is transferred to the destination position
with the same orientation that is has at the initial position, i.e., the same face
of the card 30 faces upwards in both initial and destination state of the device 10.
This is a result of the counterclockwise rotation and the configuration of the cam
roller guide 20 as shown in Fig. 1B.
[0097] Fig. 1C, on the other hand, shows a case, where the rotator element 12 is rotated
clockwise around the rotation axis 12a. In this case, the cam roller 16 is following
the cam roller guide 20, until it reaches the second limitation stop 20b, which prevents
further rotation.
[0098] The holder element 14 stays in contact with and is held by the orienting member 18
in the same first holder orientation as in the initial state. At the same time, the
rotator element 12 is rotated 180°, such that the holder element 14 and the card 30
therein are also rotated.
[0099] As the rotator element 12 reaches its destination rotation angle, it is facing upwards.
At this end point, which is shown in Fig. 1C, the device 10 is in the destination
state and the card 30 has reached the destination position. Subsequently, visual inspection
can be carried out and the card 30 can be pushed onto the conveyor belt 50.
[0100] As seen in Fig. 1A and 1C, the card 30 is turned 180°, while it is transferred to
the destination position. It has therefore the opposite orientation compared to when
it is at the initial position, i.e., the opposite face of the card 30 faces upwards
in the destination state of the device 10. This is a result of the clockwise rotation
and the configuration of the cam roller guide 20 as shown in Fig. 1B.
[0101] Thus, the device 10 can transfer the card 30 either with the same orientation as
before, when the rotator element 12 rotates counterclockwise. It can also transfer
the card 30 with the opposite orientation, i.e., in combination with a flipping action,
when the rotator element 12 rotates clockwise.
[0102] The device 10 is configured to transfer cards 30 at a given speed. A "cycle time"
is defined as the minimum time interval between the transfer of two cards 30 by the
device 10. For the purpose of the embodiment, a cycle time is provided that is short
enough to transmit 1500 cards 30 per hour. The time needed for performing the visual
inspection may be part of this cycle time.
[0103] In the embodiment, the device 10 receives a control signal and the rotation direction
and rotation speed of the rotator element 12 are configured according to the control
signal.
[0104] In further embodiments, a control unit generates the control signal and transmits
it to the device 10.
[0105] In further embodiments, the control signal is generated depending on input data,
which is acquired before or when the card 30 is loaded on the holder element 14. For
example, a sensor can check the original orientation of the card 30 at the initial
position and it can be decided, whether or not the card orientation should be changed
during transfer.
[0106] In further embodiments, a visual inspection is performed on the card, when the rotator
element 12 reaches the destination rotation angle. For example, imaging data can be
acquired by a camera, e.g., for performing a calibration or to determine the position
of calibration positions.
[0107] Depending on the visual inspection or another signal, a further control signal can
be generated to rotate the rotator element 12 back to the initial rotation angle and
further, in order to provide the card 30 with the opposite orientation at the destination
position.
[0108] For example, the orientation of the card 30 can be checked and, if the opposite orientation
is desired, the card can be flipped by rotating the rotator element 12 into the opposite
direction. Also, calibration, for example by visual inspection, treatments or similar
actions can be carried out on both sides of the card 30, while it is held in the holder
element 14.
[0109] In order to output the card 30 from the device 10, a pusher may push the card 30
such that it leaves the holder element 14. This is described in further detail below.
[0110] Turning to
Fig. 2, the embodiment of Fig. 1A to 1C is explained in more detail.
[0111] From the drawing of Fig. 2, it is visible that the holder element 14 with the cam
roller 16 is symmetrically configured. The card 30 is held on opposite sides, which
is further explained below. The cam rollers 16 are each guided along symmetrically
configured cam roller guides 20, which have limitation stops 20a, 20b.
[0112] Furthermore, the device 10 has a homing sensor 12b for the rotator element 12. In
particular, this sensor 12b is configured to determine when the rotator element 12
is reaching the initial position, as shown in Fig. 2. This information can be used
to control a stepper motor 62, which drives the rotator element 12. For example, a
calibration step for the rotation angle of the rotator element 12 can be performed
to provide reproducible and precise transfer and positioning of the card 30.
[0113] Also, the device 10 comprises a pusher 64, which is driven by a motor 60.
[0114] The pusher 64 is configured such that, when its arm is driven by the motor 60, it
is moved in a pivoting motion and pushes a card 30 from the holder element 14 out
of the device 10. For example, the card 30 is pushed onto the conveyor belt 50 shown
in Fig. 1A.
[0115] Also, the pusher 64 is configured such that a card can only be pushed out, when it
is at the destination position, in this case higher than the initial position. This
destination position is reached, when the rotator element 12 is rotated upwards.
[0116] A homing sensor 64a is provided to detect a defined position of the pusher 64 and
its arm, respectively. This allows, e.g., performing a calibration in order to provide
reproducible and precise transfer and positioning of the card 30.
[0117] Furthermore, a sensor 66 for "flip detection" is provided. This sensor 66 detects
the cam roller 16, when it reaches the second limitation stop 20b. In this case, the
transferred card 30 has been flipped, as described above with references to Fig. 1C.
Based on the detection of the sensor 66, a signal may be generated and transmitted,
e.g., to the control unit, that the flipping of the card 30 has occurred.
[0118] Eccentric adjustment bushings 68 are provided to adjust the device 10 and for example
to make sure that the elements are properly aligned, and that the transferred cards
30 reach the predetermined destination position exactly.
[0119] In the embodiment, an elastic coupling is provided between the rotator element 12
and the motor 62 to ensure a stable position of the holder element 14, in particular
for performing a visual inspection on the card 30 at the destination position. Thus,
there is no need for a high accurate motor controller. This imposed mechanically rigid
position of the holder element 14 can be adjusted by the eccentric bushings 68. In
particular, the destination position can be independently adjusted for both flipped
and non-flipped transfer.
[0120] Also, the device 10 has a card detection sensor 70, which detects the presence of
a card 30 at the destination position.
[0121] Turning to
Fig. 3A to 3C, the operation of the rotator element and the pusher is explained in further detail.
[0122] The rotator element 12 is actuated by a motor 62 and the pusher 64 is actuated by
another motor 60. In the embodiment, the motors 60, 62 are provided as direct drive
stepper motors without a position feedback. For each movement, an accurate optic fork
sensor is provided for homing, and an extra inductive proximity switch is provided
for detecting a flip position as well. Both homing signals are intended to use an
upcoming flank. For the rotator homing position 120, a software-adjustable offset
parameter ensures an accurate entry position 120, i.e., initial loading position of
the holder element 14. A mechanical tool 80 makes it possible to comfortable validate
the position by caliper measurements, shown in Fig. 3A as height measurements H1,
H2.
[0123] The schematic drawings of Fig. 3B and 3C show different angles of the rotator element
12 and the pusher 64, as well as their activation in different phases of operating
the device 10:
The signals of the sensors of the device 10 correspond to specific phases of the operation
and positions of both pusher 64 and rotator element 12. When the pusher homing sensor
signal S2 is "high", the rotator element 12 is allowed to rotate. In case the rotator
homing sensor signal S1 is "low", the pusher 64 may always move to the home position
130.
[0124] According to Fig. 3B, an offset angle A0 is configured as a software parameter. Also,
a "No Flip" angle A1 and a "Flip" angle A2 are provided as software parameters.
[0125] The homing sensor signal for the pusher 64 switches to "high", when the homing position
130 is reached, as shown in Fig. 3C. Herein, a safe area 150 is defined, based on
the signal S2 of the pusher homing sensor 64a. Thus, no collision of the pusher 64
with the rotator element 14 or another element occurs.
[0126] A home position for the pusher 64 is defined as a rest position 140 for the pusher
64, while the main transport phase of the device 10 is active.
[0127] Also, an angle A3 is defined for the pusher 64 during visual inspection of the card
30. Here, this angle A3 is located shortly before the end position of the pusher 64
in this direction, for example at about 32°.
[0128] Furthermore, an angle A4 is defined for the pusher 64 as a feed angle or output angle:
The pusher 64 is pivoted to push out the card 30 from the holder element 14, when
the destination position is reached. This angle A4 is located shortly before the end
position in this direction, for example at about 86°.
[0129] The following initialization diagram gives all initialization statuses with corresponding
actions:
S1 |
S2 |
S3 |
S4 |
Action sequence |
X |
1 |
X |
1 |
1. Home pusher |
|
|
|
|
2. Home rotator CW |
0 |
1 |
X |
0 |
1. Home pusher |
|
|
|
|
2. Home rotator CW |
1 |
1 |
X |
0 |
1. Home pusher |
|
|
|
|
2. Home rotator CCW |
1 |
0 |
X |
0 |
1. Home rotator CCW |
|
|
|
|
2. Home pusher |
1 |
0 |
X |
1 |
1. Home pusher |
|
|
|
|
2. Home rotator CW |
0 |
0 |
X |
X |
Output message: "move pusher to home position", then X, 1, X, X |
[0130] Turning to
Fig. 4A and 4B, a detailed view of a holder element 14 of the device 10 is explained.
[0131] To be able to perform a sufficiently accurate image recording and/or visual inspection
of the card 30, when it reaches the destination position, it is necessary that the
card 30 is positioned at the correct height. To secure the card 30 in the holder element
14, it is clamped between constraining pieces 31a, 31b with V-grooves on opposite
sides of the holder element 14. The constraining pieces 31a on one side are fixed,
while constraining pieces 31b on the opposite side are spring-loaded by leaf spring.
[0132] In particular, the fixed constraining pieces 31a on one side form a fixed reference
guide, while the spring-loaded constraining pieces 31b on the opposite side form a
spring-loaded guide.
[0133] For the purposes of the present embodiment, the card thickness is assumed to be accurately
known. Thus, the card's top surface will also be at a reproducible height in the device
10.
[0134] In order to be able to scan curved cards well, the card 30 is held at three points
on both sides, i.e., by six constraining pieces 31a, 31b. Although the position is
thus over-constrained, it is assumed that the card edge is exactly straight, and therefore
the flatness of the card surface as well.
[0135] Turning to
Fig. 5A and 5B, a second embodiment of the device is described. In Fig. 5A, the device is shown in
a front view perspective, and in Fig. 5B, the device is shown in a sectional view,
along the axis S-S. Elements that are similar to the elements of the above-described
embodiments are denoted with the same reference numerals and are not described again
in detail.
[0136] In the case of Fig. 5A and 5B, the device 210 is shown in the initial state.
[0137] As already described above, the device 210 comprises a rotator element 212 and a
holder element 214, which is configured to take up a flat piece 230, in this case
a plastic card 230.
[0138] The rotator element 212 is connected to a motor 262 and can be rotated around a rotation
axis 212.
[0139] The holder element 214 is connected to the rotator element 212 rotatably around the
swivel axis 214a.
[0140] In the present embodiment, the rotation of the holder element 214 is limited by a
holder gearwheel 215, which is fixed to the holder element 214. Herein, the holder
gearwheel 215 is coaxially arranged with the holder axis 214a.
[0141] The holder gearwheel 215 engages with a static gearwheel 213, which is fixed relative
to the rotator element 212. Herein, the static gearwheel 213 is arranged coaxially
with the rotation axis 212a. In particular, the static gearwheel 213 is fixed to a
housing of the motor 262.
[0142] Thus, when the rotator element 212 is rotated, the holder element 214 with the holder
gearwheel 215 is rotated as well. Its engagement with the static gearwheel 213 leads
to a corresponding rotation of the holder element 214 relative to the rotator element
212.
[0143] The diameters and numbers of teeth for the static gearwheel 213 and the holder gearwheel
215 are configured such that after a 120° clockwise rotation of the rotator element
212, the holder element 214 has been turned 180°. Thus, the card 230 in the holder
element 214 is been flipped over, while it is transported to the destination position.
On the other hand, after a 240° counter-clockwise rotation of the rotator element
212, the holder element 214 has been turned 360°. Thus, the card 230 in the holder
element 214 is presented with the same side facing upwards as in the initial position.
[0144] Also, a height difference h is overcome between the initial and destination position.
[0145] In further embodiment, the device 210 of the second embodiment has analogous sensors
as the ones described above to measure the present rotation state of the rotator element
212 and/or the holder element 214, and/or to determine the orientation of the holder
element 214, whether the card 230 is flipped or not.
[0146] Also, a loading element may be provided to load a flat piece 230 into the holder
element 214 at the initial position and/or an output element may be provided to output
the flat piece 230 at the destination position.
Reference numerals
[0147]
- 10
- Device
- 12
- Rotator element
- 12a
- Rotation axis
- 12b
- Homing sensor rotator element
- 14
- Holder element
- 14a
- Swivel axis
- 16
- Cam roller
- 18
- Orienting member
- 18a, 18b
- Magnetic element
- 20
- Cam roller guide
- 20a
- First limitation stop
- 20b
- Second limitation stop
- 30
- Flat piece, card
- 31a
- Constraining piece
- 31b
- Constraining piece (spring-loaded)
- 40
- Loading element
- 50
- Conveyor belt
- 60
- Motor pusher arm
- 62
- Motor rotator element
- 64
- Pusher; outputting element
- 64a
- Homing sensor pusher-arm
- 66
- Sensor "flip detection"
- 68
- Eccentric adjustment bushing
- 70
- Card detection sensor
- 80
- Mechanical tool
- 110
- Vision position, Card exit position
- 120
- Home, 0°, Card entry position
- 130
- Home, 0°
- 140
- Endstop
- 150
- S2, Safe area
- 210
- Device
- 212
- Rotator element
- 212a
- Rotation axis
- 213
- Static gearwheel
- 214
- Holder element
- 214a
- Holder axis
- 215
- Holder gearwheel
- 230
- Flat piece, card
- 262
- Motor rotator element
- H1, H2
- Height
- h
- Height difference
1. Device (10) for transferring a flat piece (30), in particular a plastic card (30),
from an initial position to a destination position, comprising
a holder element (14) for holding the flat piece (30); and
a rotator element (12), which is rotatable around a rotation axis (12a); wherein
the holder element (14) is swivel-mounted to the rotator element (12), such that the
holder element (14) is rotatable relative to the rotator element (12) around a swivel
axis (14a); wherein,
when the rotator element (12) is at a destination rotation angle, the holder element
(14) can have a first or a second holder orientation relative to the rotator element
(12); and,
when the rotator element (12) is rotated from an initial rotation angle towards the
destination rotation angle in a first rotation direction, the holder element (14)
reaches the destination position having the second orientation relative to the rotator
element (12).
2. Device (10) according to claim 1,
characterized in that
the device (10) further comprises a loading element (40), which is configured to load
the flat piece (30) from the initial position to the holder element (14).
3. Device (10) according to any of the preceding claims,
characterized in that
the device (10) further comprises a rotation motor unit (62), which is configured
to drive the rotation of the rotator element (12); and
a control unit, which is configured to control the rotation direction, a rotation
speed, an amount of rotation and/or a rotation angle of the rotator element (12).
4. Device (10) according to any of the preceding claims,
characterized in that
the device (10) is in an initial state, when the rotator element (12) has the initial
rotation angle, for example when it is facing downwards in a gravity field; and/or
the device (10) is in a destination state, when the rotator element (12) has the destination
rotation angle, for example when it is facing upwards in a gravity field.
5. Device (10) according to any of the preceding claims,
characterized in that
when the rotator element (12) is at the initial rotation angle, the holder element
(14) has the first holder orientation relative to the rotator element (12); wherein
a cam roller (16) is connected to the holder element (14); wherein,
when the rotator element (12) is rotated towards the destination rotation angle in
the first rotation direction, the cam roller (16) reaches a first limitation stop
(20a), such that the holder element (14) is rotated towards the second orientation
relative to the rotator element.
6. Device (10) according to claim 5,
characterized in that
the device (10) further comprises at least one orienting member (18) for keeping the
holder element (14) in the first or second holder orientation relative to the rotator
element (12); wherein, optionally, the orienting member (18) comprises a magnetic
element (18a, 18b); and/or
the cam roller (16) is connected to the holder element (14) such that it has a fixed
position relative to the holder element (14).
7. Device (10) according to claim 5 or 6,
characterized in that,
when the rotator element (12) is rotated towards the destination rotation angle in
a second rotation direction, in particular opposite to the first rotation direction,
the cam roller (16) reaches a second limitation stop (20b), such that the rotation
of the rotator element (12) is stopped.
8. Device (10) according to any of the preceding claims,
characterized in that
the rotation of the holder element (214) is coupled to the rotation of the rotator
element (212) by a gearing.
9. Device (10) according to claim 9,
characterized in that
the holder element (214) is fixed to a holder gearwheel (214), which engages with
a static gearwheel (212).
10. Device (10) according to claim 9 or 10,
characterized in that
the static gearwheel (212) is arranged concentric with the rotation axis (212a); and/or
the holder gearwheel (214) is arranged concentric with the swivel axis (214a).
11. Device (10) according to any of claims 9 to 11,
characterized in that
the static gearwheel (212) and the holder gearwheel (214) have a transmission ratio
such that a full rotation of the rotator element (212) corresponds to (N+0.5) rotations
of the holder element.
12. Device (10) according to any of the preceding claims,
characterized in that,
when the rotator element (12) is rotated in the first rotation direction and reaches
the destination rotation angle, the holder element (14) has essentially the same holder
orientation relative to the rotator element (12), as when the rotator element (12)
is at the initial rotation angle; and/or,
when the rotator element (12) is rotated in the second rotation direction and reaches
the destination rotation angle, the holder element (14) has essentially an opposite
holder orientation relative to the rotator element (12), as when the rotator element
(12) is at the initial rotation angle.
13. Device (10) according to any of the preceding claims,
characterized in that
the device (10) further comprises an outputting element (64), in particular a pusher
element (64) or a feeding element, to output the flat piece (30) from the holder element
(14).
14. Device (10) according to any of the preceding claims,
characterized in that
a height difference (h) is provided between the initial and destination position of
the holder element (14); wherein,
optionally, the height difference (h) extends along an axis parallel to an axis of
a gravity field.
15. Method for transferring a flat piece (30), in particular a plastic card (30), from
an initial position to a destination position, wherein
the flat piece (30) is loaded on a holder element (14) at the initial position; and
a rotator element (12), to which the holder element (14) is swivel-mounted, is rotated
around a rotation axis (12a) from an initial rotation angle to a destination rotation
angle; wherein,
when the rotator element (12) is at the destination rotation angle, the holder element
(14) has a first or a second orientation relative to the rotator element (12); and,
when the rotator element (12) is rotated from the initial rotation angle towards the
destination rotation angle in the first rotation direction, the holder element (14)
is rotated towards a second holder orientation relative to the rotator element (12).