DE10160076C1 - Printing-capable computer docking station for PDA etc. has paper guides held together by forces from permanent magnets, and low-friction coatings on surfaces facing paper - Google Patents

Abstract

The docking station has a printing function with a paper guide in which record carriers are conveyed by two guide devices, one on the front and one of the back side of the record carrier. The guide devices are held together exclusively by magnetic field forces, and the record carrier can extend beyond the guide devices on all sides. Magnetic field forces from permanent magnets provide attraction forces orthogonal to the surface of the record carrier, and position holding forces parallel to the surface of the record carrier. Low-friction coatings are provided on the surfaces facing the paper. An Independent claim is also included for a combination of computer and docking station.

Description

The invention relates to a miniaturized expansion unit (docking station) Print function for ultra portable computers (PDAs, notebooks). The print function for Printing of common record carriers (e.g. DIN A4 foil or US letter Letter paper) is based on the paper guide according to patent DE 100 56 444. In the Minimum configuration, the expansion unit is a portable printer, which has minimal external dimensions.

A printing expansion unit or just a printer with comparable External dimensions such as available ultra-portable computers are currently not known. The known printers are all based on conventional paper guides concepts and are limited by this in terms of size.

Transportable computer expansion units of this type are, for example described in the patents WO 9808157 A2 or JP 10305627 A.

The patent WO 9808157 describes a paper guide that directly and without Use of cables can be connected to a portable computer. This is done using the connections available on the portable computer a "docking station" and with the formation of a fixed transportable unit. The patent JP 10305627 describes an advantageous embodiment of a Paper guide that used in a "docking station" (= here: mostly stationary Expansion unit for a portable computer) is installed.

Both solutions use a principle of operation in which the paper dated Guide mechanism is enclosed. This is the paper guide inevitably one dimension larger than the pressure medium.

An exception is the portable printer, which is described in US Pat. No. 5,308,173 is set out. Here a printer is described in which a sub-unit as compact, portable printer is usable and in its dimensions (length and Width) can be smaller than the medium to be printed. It is this a mobile system that can be operated by means of wheels and using the Gravity is moved through the medium to be printed by its own motor power. While the medium is being run over, the printhead contains it described. However, this printing principle sets a level and first approximation base orthogonal to gravity.  

An alternative approach is described in patent DE 100 56 444. It deals This is a paper guide that allows the printer's basic dimensions to be below to keep the paper dimensions. To allow the printer size to be reduced below the paper size are the two components lid and base between them the paper does not run materially together. The bracket of the lid takes place by means of field forces. The movement is carried out by a drive in one of the both parts.

A printer based on the paper guide according to patent DE 100 56 444 exists Not.

An inexpensive and cost-optimal design of the paper transport function has not yet been demonstrated. One approach would be the use of permanent magnets to implement the field forces. In this case, the paper guide must make do with constant field generation units. A further cost saving potential could be given by the passive design of one of the two printer parts. Such an implementation has to struggle with the constraints of the following problems:

• 1. Large, non-printable side edges ( 6 , 7 ) may result, since the paper may not be able to be guided over the central print head ( FIGS. 1 + 2) in a manner that is stable against rotation.
• 2. Long printing times may result because the recording medium is at high accelerations may tend to slip and therefore a good one Print image would be destroyed.
• 3. Ergonomic operation of the printer has not yet been clarified.
• 4. The data exchange between the computer and the printer is not yet clarified.
• 5. A correspondingly adapted printing unit is not yet known.

Furthermore, many additional products for portable computers are already known. As the number of additional devices increases, the user will find it difficult to take another additional peripheral device with them. The integration of the portable printer with the other peripheral devices:

• 1. scanner
• 2. Additional storage
• 3. camera
• 4. Additional display / projector
• 5. additional input units
• 6. additional batteries
  and so on

has not yet been resolved.

Sensors are used to discuss a possible twisting of the pressure medium interesting who can register this. Patents JP 04062624 and JP 00020230 describe an optical mouse. The change in position of the Mouse by an optical evaluation of the position of the mouse relative to this moving surface detected. The methods described are inexpensive producible and suitable for mass production.  

Furthermore, there are no approaches to realizing an automatic printer, or a printing computer expansion unit known that the advantages of use novel paper guide and at the same time the disadvantages described solve an inexpensive way.

The development is based on the task of realizing a printing computer expansion unit, or a printing combination / arrangement of computer and expansion unit using the paper transport function according to DE 100 56 444. In particular, the problem to be solved is how the design of the two printer parts can be implemented cost-effectively such that the possible accompanying problems

• 1. Large, non-printable side edges ( 6 , 7 ) may result, since the paper may not be able to be guided over the central print head ( FIGS. 1 + 2) in a manner that is stable against rotation.
• 2. Long printing times may result because the recording medium is at high accelerations may tend to slip and therefore a good one Print image would be destroyed.
• 3. Ergonomic operation of the printer has not yet been clarified.
• 4. The data exchange between the computer and the printer is not yet clarified.
• 5. A correspondingly adapted printing unit is not yet known.
• 6. Possibility of integrating additional functions.

can be remedied or become minimal.

This task is solved by designing the unit with the characteristics according to claim 1.

Advantageous refinements of this basic unit, which the possible described Solving accompanying problems are set out in the subclaims.

An example of an inexpensive complete solution based on the base unit according to claim 1 is shown in FIG. 15.

What is presented is a printing computer expansion unit that, based on the new type of paper guide, solves the problems presented by detailed solutions in the following areas:

• a) printhead (inkjet technology),
• b) communication interface printer-computer,

as well as by integrating known solutions in:

• a) detection of paper movement,
• b) integration of peripheral products,
• c) Print head (thermal sublimation printing)

in the application shown.

The detailed solutions are discussed below.

The problem 1 . is shown in Fig. 1 + 2. The result of this is that the 13 recording medium ( 3 ) must carry out long transverse movements ( 10 ) in order to completely print the right ( 7 ) and left ( 6 ) side edges in order to drive the side edges over the printing area ( 4 ). After passing through these distances, the paper is only held by part of the printer surface at the turning point. This reduces the stability of the paper guide. The risk of slippage between the recording medium and the drive unit (rollers or balls) increases. The problem can be solved by using two printheads which are mounted off-center as shown in Fig. 3 + 4. Both printheads can use the same ink supply and are controlled separately. The recording medium no longer has to be passed over a print head with each point of its area to be printed, but each point of the area to be printed only has to be passed over any of 2 possible print heads. This drastically reduces the necessary transverse movements ( 10 ). As a direct consequence of this, problem 2 also becomes significantly reduced.

It can be expected that the described double printhead shortens the printing time sufficiently. If additional time savings are also necessary, these can be achieved by accelerating them faster and using slip correction using paper movement detectors. FIG. 5 shows an advantageous embodiment using conventional optical sensors, such as are also used in pointer input instruments for computers (optical mouse). The example shown uses two such sensors. This allows the technology of the mass-produced sensors of the "optical mouse" to be built upon. Their sensors deliver the displacement vectors x and y directly. The rotation angle β can be determined by attaching several such sensors. In addition, from the over-determination (with two sensors from x ₁ , y ₁ , x ₂ , y ₂ to x, y, β), there is the possibility of increasing the error tolerance and increasing the accuracy. Alternatively, a sensor can be used that delivers x, y and β directly.

By knowing the actual movement of the paper, a reduction in quality due to slippage can now be avoided, as described in FIG. 6. This can be achieved either by position control ( 12 ) or by shifting the print image ( 13 ). As a result, higher paper accelerations can be used, which leads directly to a reduction in printing time.

Problem 3 (ergonomic operation) is divided into various sub-problems. A sub-problem is the risk of the protruding recording medium accidentally colliding with nearby objects or the user himself. This can lead to an unwanted change in the position of the paper and thus to a deterioration of the printed image. The problem can be solved analogously to the above embodiment and, as described in FIGS. 5 + 6, by position detectors.

Another ergonomic inadequacy can be seen in the possible incorrect paper orientation before the start of printing. Apart from a switchable stop for the recording medium for cost reasons, an angular error is very likely. The user can be obliged to insert paper parallel to the printer edge, but this appears to be user-unfriendly. The proposed solution here provides for a defined fixed stop (over which the paper can be lifted away), a foldable stop or an automatic alignment correction of the recording medium or the printed image before the start of printing. Since at least one origin coordinate (e.g. the upper left corner) of the record carrier must be known in any case for the correct assignment of the print image, the automatic detection also appears advantageous from a price / performance perspective. Fig. 7 shows a possible implementation. The design of an edge detector ( 14 ) can be optically, for. B. by utilizing the deep jump (paper / edge / second printer part) by means of a distance detection similar to the CD reading head. Due to the possibility of edge detection, z. B. by a sequence as described in Fig. 8, the recording medium is automatically aligned and brought into a defined print starting position. The alignment of course requires a possibility of twisting the paper, which can be implicit in the paper guide concept used. A possible solution is shown in Fig. 13. The drive is in the middle. The transmission of power from the drive shaft ( 37 ) to the left shaft for the left drive roller ( 39 ) or to the right shaft for the right drive roller can be kept switchable by means of a sliding linkage ( 38 ). The non-driven shaft is held in place by a non-rotating sliding sleeve with internal teeth ( 37 ). The configuration shown enables 3 switching positions:
Condition A ( 41 ) = Both sides rotate synchronously with the drive shaft ( 37 ).
Condition B ( 42 ) = The left side rotates synchronously with the drive shaft ( 37 ), while the right side stands.
State C ( 43 ) = The right side rotates synchronously with the drive shaft ( 37 ) while the left side stands.

The correction of the twist can now be done using the Paper movement sensors are checked or regulated. Will not be Paper motion detectors are used, then a check can also be made passing over the edge detectors again. Ideally, both Tasks: paper movement detection and edge detection by the same sensor Fulfills. This is possible with an image-based sensor and appropriate software.  

A cheaper variant of this solution could be just one Allow automatic direction of rotation (e.g. to the right) and the user Insert the paper in a deliberately twisted position against the possible one Prescribe correction direction of rotation. This gives the user an allowable Angular range when inserting 45 °: z. B. from -45 ° to the left correct 0 ° insert - the printer turns the paper from every starting position right back to 0 °.

A possible embodiment could provide a bidirectional drive on one side (e.g. on the right). In the middle, instead of the sliding drive shaft with internal toothing ( 37 ), there is only a driver with a freewheel and on the other side (e.g. on the left) there is a reverse brake. In this example, the right side could make a forward and backward turn. The left side would only go along with the forward rotation and would stop when the right side would reverse. This allows the paper to be rotated in one direction without the paper return option.

As an alternative to the correction rotation of the paper, the print image can also be rotated accordingly by a software routine. Fig. 14 shows one possible calculation process here. A paper transport is used that can transport both forward and backward. The edge detectors are read out and the paper is then moved so that the upper edge of the paper is moved over both edge detectors and one side edge over one edge detector. The motion vectors of the paper are registered. This can be done both by the control data of the drive and by using paper movement detectors.

Since the dimensions of the paper are known during printing (is usually from Printer Driver Required) can be understood by knowing these three points Paper edges the position of the record carrier can be determined. The print image is now carried out by an appropriate arithmetic operation (rotation of the 2D dot matrix) brought into line with the known actual filing of the paper.

A translation of the printed image is also conceivable. However, this corresponds to that anyway possible movement of the paper transport device and is therefore obsolete.

A combination of both methods (twisting of the record carrier or the Print image) is conceivable.  

Another ergonomic problem can be seen in printer operation become. Operation via the computer is suggested as a solution here that the problem is reduced to a practical connection to the computer leaves.

Problem 4 (data exchange with the computer) could be done conventionally via cable (e.g. USB connection), but this would involve a certain amount of connection work. In contrast, a wireless connection is advantageous. For connecting to a notebook, for. B. a Bluetooth connection is conceivable. An alternative energy-saving data transmission would be optically feasible (e.g. via a conventional infrared interface). Since IR radiation has only a low absorption with the usual recording media (paper, film), an interruption of the beam by the recording media would be unproblematic.

For extremely portable computers (usually called PDAs), this results in a particularly advantageous embodiment (sectional figure 9 , shows no details of the inside of the printer or computer) in that the active printer part is designed as a lower part ( 1 ) and the computer is used as a passive printer upper part ( 17 ) becomes. This means that the computer has already been designed for this application (this only requires a low-friction and appropriately shaped back, as well as inserts as a counterpart for the necessary attractive forces, e.g. a magnetic steel insert ( 21 ) to close the magnetic circuit over the paper gap ). If the magnetic flux conductors (21 + 24) and the magnets ( 20 ) form a closed magnetic circuit (with the highest magnetic resistance on the paper) in a pressure-ready configuration, then this both maximizes the attractive forces and minimizes the disturbing magnetic stray field. A further minimization of the magnetic radiation may be necessary in the computer to protect the electronics ( 22 ). In this case, a suitable shield ( 23 ) can be fitted around the magnetic flux conductor ( 24 ) in the computer. In addition to the additional weight reduction and simple operation of the printer via the computer-operator interface, the data exchange by means of infrared transmission through the paper is also energy-optimized due to the short distance from one transmitter / receiver unit to the other (15 + 16).

The printer can now be operated via the user interface of the computer which can be used as an upper part of the printer. The display ( 18 ) can be used as the output interface. If this is designed as a touch screen, it can also be used as an input interface next to a keypad ( 19 ). As an alternative to using the computer as a complete second printer part, the computer can also be attached to the existing upper part of the printing expansion unit.

In principle, the paper guide does not necessarily determine the printing technology. The However, using inkjet printheads makes sense. This was also mentioned above Already an adjustment using two independent printheads spelled out with a common ink tank. Besides this possible adjustment the print head is counter to gravity by reversing the print direction a necessary adaptation to the changed gravitational conditions required. This affects in particular the ink supply. While the existing systems the ink supply by using the Solving the gravitational field, alternative solutions are necessary here.  

The following approaches are conceivable:

• - Ink with appropriate capillary action is used and the Replenishment through thin cross sections from the lower tank area promoted. The ink transport is in addition to the capillary forces secured by the suction forces of the printing unit. If necessary, before the printing unit is a pumping unit built using microsystem technology be used.
• - The ink tank is filled with propellant under pressure and the ink with the Principle of the "spray can" driven upwards.
• - By shaking part of the ink is always in an upper tank area from which the ink then goes directly into the print head.

Another aspect when using inkjet technology is the attachment of a Printing unit cover to protect against drying out. Here the is proposed To combine the printer cover with the printer's power button. So can For example, the power button can be realized by a slide switch also serves as a printhead cover: If the printer is off, then the Printheads covered, the printer is switched on, then the opens Slide the printhead cover. This can be done either with a fixed Switch part can be realized or designed by an intermediate gear his. This ensures that the printhead is open when in use is. The opening can also be done against a spring force. A lock prevents the switch from sliding back. The shutdown will then by releasing the locking mechanism. This would be automatic coverage simplify the print head after a long period of non-use.

In addition to inkjet technology, other printing techniques could also be used. Thermal sublimation printing is mentioned here as an example.

In this case it makes sense to place the thermal sublimation print head in the middle of the printer (see Fig. 10) and to print one row (or column) at a time. In this printing method, the provision of a (not necessarily continuous) groove ( 25 ) along the direction of movement and at the level of the print head is sufficient to prevent the freshly applied printing ink from blurring.

The attachment of further peripheral units can be done accordingly provided slots on the printer. To reduce the Total space requirement of the printer, however, it makes little sense to use an internal one To keep empty space in case of an expansion. At the same time, it is not possible to simply add an extension to the side, as this may result in the Paper leakage can be obstructed. Useful attachment options exist below the lower part of the printer (or above the upper part of the printer), as well as conditionally between the two printheads at the end of the printer.

It is therefore proposed that the active printer part on the paper guide opposite side to provide for the expansion. There is one Interface for energy transmission, for information transmission, as well as a Mechanical locking device necessary.

An advantageous implementation is shown in FIG . The expansion unit ( 30 ) is coupled to the underside of the printer lower part ( 1 ). In addition to the transmission of energy and information, two male plugs ( 27 ) on the expansion unit also serve to guide when clipping on. The expansion unit is fixed in place by means of snapping bumps ( 29 ) in locking grooves ( 26 ) in the lower part of the printer ( 1 ). FIG. 12 shows a possible embodiment of the housing, which also represents the release of the locking by exerting pressure on a pressure point ( 33 ). The example shows a camera expansion unit that also uses the possible space between two print cartridges. This arrangement of the camera also allows the use of the camera unit as a scanner.

All that is required is a macro recording function of the camera and one appropriate lighting. The existing paper guide then allows one automatic scanning of documents.

The possible continuation of the expansion by further clipping additional expansion units onto the already fixed expansion unit ( 30 ) is also indicated. This series of extensions is called the sandwich principle in this paper. To do this, the expansion units would also have to have female plugs ( 28 ) and corresponding locking grooves (not shown here in the expansion unit, but analogously to 26).

The above explanations show solutions to the problems described Realization of a miniaturized expansion unit with print function for ultra-portable calculator. This is the first time a printing expansion unit become possible. This extension stands out in addition to the print function from the fact that it is at least two parts together with the computer (results in from the two-part principle of paper guide) and a paper alignment through an attack or active regulation. In addition, the printer is not connected to the computer on the energy side.

The other partial solutions are strongly interlinked, so that a meaningful configuration of the expansion unit based on DE 100 56 444 can be described by:

• - Concentration of the active unit with pressure function on the lower part
• - Use of magnetic field forces from at least one closed one Magnetic circuit as attractive forces (orthogonal to the surface of the Recording medium) and positioning forces (parallel to the surface of the Record carrier) of the guide parts using Permanent magnets.
• - Use 2 inkjet printheads at the end of the printer to hold the ink Use capillaries to feed the printhead to the top.
• - Use of an active paper alignment with optical sensors
• - Design of the optical paper alignment sensor system with a (Image-oriented) solution, which is also used to measure the motion vector can be used.
• - Realization of active paper alignment by a simple one Correction system that only the printer-side correction rotation in one Direction of rotation allowed and the reverse direction of rotation of the Feed motor used at the expense of a paper return transport.
• - Manual cover of the pressure nozzles coupled with the power button
• - Use of the computer as the upper part of the printer
• - Wireless IR communication between the computer and the printer
• - Design of the computer-printer interface such that additional Extensions (e.g. camera / scan head) both directly to the computer (under Use of the same magnetic and IR communication interfaces) or else can also be used stacked one below the other according to the sandwich principle can.

This possible embodiment is shown in FIG . The upper part shows a section through one side of the system. The functional elements of the print head (5), the combined edge detection and motion sensor (14/11), the drive roller (45) and the feet with holding (48) are necessarily present in both the left and in the right side of the system. The functions shown, infrared data receiver ( 15 ) and data transmitter ( 16 ), would have to be attached inverted on the other side. The closed magnetic circuit with the magnets ( 20 ), magnetizable armature ( 21 ) in the computer and the magnetic flux conductor ( 24 ) could alternatively be attached only once in the middle of the system and not as shown here once (i.e. twice in total) on each side ,

Fig. 15 shows the system in the dynamic state during the acceleration of the paper from the paper guide in the direction of the print head (from right to left in the drawing). Due to the frictional driving forces F _R , the computer ( 17 ) is slightly shifted to the left.

The stability of this not actively controlled embodiment should be briefly justified: the magnetic field lines ( 46 ) run from the magnetizable armature ( 21 ) in the computer to the magnet ( 20 ). If the computer moves to the left as shown, the direction of the magnetic force F _M (which follows the field lines) gets a horizontal portion to the right F _MH . In the vicinity of the working point (= armature 21 is perpendicular above the magnet 20 ), the amount of the horizontal magnetic restoring force F _{MH increases} with increasing horizontal displacement. The frictional driving force F _R is present before the acceleration as static friction and then changes to sliding friction, which means that it tends to decrease. Thus, with increasing deflection of the upper printer part (here the computer 17 ), a point is reached from which the horizontal restoring force F _MH becomes greater than the frictional driving force F _R opposing it. This state is shown in the vector addition ( 47 ). As a result, the system allows only limited deflections of the upper passive printer part ( 17 ) to the lower active printer part ( 1 ).

An important parameter of this principle is the coefficient of friction between the upper printer part ( 17 ) and the paper ( 3 ). The smaller this coefficient of friction, the lower the frictional driving force F _R. For this reason, it makes sense to provide the paper-side guide surface of the upper printer part ( 17 ) with a friction-optimized coating ( 44 ).

In addition, FIG. 15 shows a concrete expression of the expansion option based on the sandwich principle. In the lower end of the lower printer part ( 1 ) the same interfaces (magnetizable armature 21 and IR data interface 16 ) are provided as on the computer. So z. B. one and the same expansion unit, e.g. B. a camera / scanner module, used on the computer as a camera and coupled to the lower part of the printer as a scanner. Appropriate grooves in the camera / scanner module, into which the feet ( 48 ) of the lower part of the printer can be inserted, can also achieve the positional stability required for the scan function. These grooves do not hinder direct coupling to the computer.

As already mentioned, the left and right drive rollers ( 45 ) move synchronously in the forward mode, while one of the two stops in the reverse mode. This enables uncomplicated, defined twisting of the recording medium in a 45 ° area.

For reasons of clarity, the drive rollers for the transverse movement, the print head cover and further details of the interior of the computer ( 17 ) and the lower printer part ( 1 ) were not shown in FIG. 15.

LIST OF REFERENCE NUMBERS

Miniaturized computer expansion unit with print function

1

Lower part (first guide device)

2

Upper part (second guide device)

3

record carrier

4

Longitudinal printing area

5

Printhead / cartridge

6

Left margin

7

Right margin

8th

Lower margin

9

Movement directions (horizontal = longitudinal and vertical = transverse)

10

Necessary cross movements

11

Motion sensors of the record carrier

12

Position control record carrier

13

Print image shift

14

edge detector

15

Infrared data receiver

16

Infrared data transmitter

17

Computer (PDA) that can be used as a printer top

18

display

19

keypad

20

magnet

21

Magnetizable armature (magnetic flux conductor in the computer)

22

electronics

23

Electromagnetic shielding

24

Flux guides

25

Trocknungsnut

26

locking groove

27

Male connector

28

Female connector

29

snap bumps

30

expansion unit

31

camera

32

cutting plane

FIG.

12

33

Pressure point (to release the locking)

34

Non-rotating sliding sleeve with internal teeth

35

gear

36

abrasion

37

Sliding drive shaft with internal teeth

38

shift linkage

39

Left shaft for left drive roller

40

Right shaft for right drive roller

41

Condition A

42

Condition B

43

Condition C

44

Friction-reducing coating

45

capstan

46

Magnetic field forces in the enlarged section

47

Vector addition of forces

48

Feet with a potential locking function

Claims (24)

1. Printing computer expansion unit, characterized in that
the extension unit contains a printing function with a paper guide in which the record carrier is transported by a first guide device leading on its front side and a second guide device opposite it and the record carrier on its back guide, the guide devices being held together exclusively by field forces and the guide devices simultaneously on all sides the record carriers are superior.
Magnetic field forces from permanent magnets are used as attractive forces which are orthogonal to the surface of the record carrier and as position holding forces (parallel to the surface of the record carrier) of the guide parts.
low-friction coatings on the surface, towards the paper. 2. A printing computer expansion unit according to claim 1, characterized characterized in that the active printing unit in the lower part of the two-part paper guide and at least the top one has a low-friction coating on the paper-carrying side. 3. A printing computer expansion unit according to one of claims 1 to 2, characterized in that the alignment of the paper to the printed image is ensured by:
either automatic paper alignment using a paper edge detector and a motorized twist correction, or
automatic print image alignment using a paper edge detector and a corresponding computing process. 4. A printing computer expansion unit according to one of claims 1 to 2, characterized in that the orientation of the paper to the printed image is ensured by either a solid paper stop that can be run over or a foldable paper stop.   5. A printing computer expansion unit according to one of claims 1 to 4, characterized in that the magnetic field outside the Record carrier is guided in a closed magnetic flux conductor. 6. A printing computer expansion unit according to claim 5, characterized characterized in that the magnetic field and the magnetic flux conductors for Prevention of electromagnetic interference fields shielded from the outside are. 7. A printing computer expansion unit according to one of claims 1 to 6, characterized in that the print image by two print heads is generated, which can divide the area to be printed. 8. A printing computer expansion unit according to one of claims 1 to 6, characterized in that the print image by a print head is generated within the paper guide, and the freshly printed Row / column runs over a drying groove designed so that the fresh Ink does not come into contact with the guide surface. 9. A printing computer expansion unit according to claim 7 or 8, characterized in that the printheads are ink jet printheads, with the ink either on the higher printheads
over capillaries using the capillary forces and / or suction forces or
is transported from the bottom up to the print head by overpressure in the ink tank and an ink-carrying line. 10. A printing computer expansion unit according to one of claims 1 to 9, characterized in that the actual movement vector of the paper by means of Sensors is detected and the calculated difference to the target Motion vector to a correspondingly corrected shifted print image is used. 11. A printing computer expansion unit according to claim 10, characterized characterized that the paper movement sensor also as Paper edge detector can be used. 12. A printing computer expansion unit according to one of claims 1 to 11, characterized in that a printing unit cover is used, which simultaneously controls the switch-on status of the device. 13. A printing computer expansion unit according to claim 12, characterized characterized that the printing unit cover opened against a spring is and in the open state by an electrically releasable lock is held.   14. A printing computer expansion unit according to one of claims 1 to 13, characterized in that the data exchange between the Printer parts is designed wirelessly. 15. A printing computer expansion unit according to claim 14, characterized characterized that the data transmission optically through the paper through it. 16. A printing computer expansion unit according to one of claims 1 to 15, characterized in that this unit has connections for additional Has expansion according to the sandwich principle. 17. A printing computer expansion unit according to one of claims 1 to 16, characterized in that this unit also for automatic Reading (scanning) of information carriers can be used. 18. A printing computer expansion unit according to one of claims 1 to 17, characterized in that the drive for paper movement so is designed so that the right / left side is also asynchronous from each other can be driven. 19. A printing computer expansion unit according to claim 18, characterized characterized in that the drive changes the direction of rotation of the motor in an asymmetrical movement of the right and left record carriers feeds and thus a rotation of the record carrier into a exercises defined direction. 20. A printing combination / arrangement of calculator and one Expansion unit according to one of claims 1 to 19, characterized characterized that the computer is part of the overall printing system. 21. A printing combination / arrangement of calculator and Expansion unit according to claim 20, characterized in that the Computer for use as the sole upper part of the paper guide is designed. 22. A printing combination / arrangement of calculator and Expansion unit according to claim 20, characterized in that the Computer with one of the two parts of the paper guide is firmly coupled. 23. A printing computer expansion unit according to claim 3, characterized in that the correction of the paper position is carried out in the steps:

• - In a first step, the actual position of the record carrier is determined.
• - In a further step, the difference between the ACTUAL position and the TARGET position is calculated.
• - In a last step the record carrier is controlled or twisted.

24. A printing computer extension unit according to claim 23, wherein the rotation of the record carrier is characterized by:
For the record carrier, a defined storage at the beginning, in the form of a deliberate rotation in one direction of rotation, is specified.
The correction is only made in one direction of rotation.
In the event of an impermissible first filing of the paper, the printing process is stopped and the user is informed accordingly.