EP1278641A1

EP1278641A1 - Printing device

Info

Publication number: EP1278641A1
Application number: EP01911763A
Authority: EP
Inventors: Jürgen Bernhard; Hans Michael Eppler; Willi Sautter
Original assignee: Bizerba SE and Co KG
Current assignee: Bizerba SE and Co KG
Priority date: 2000-05-02
Filing date: 2001-03-13
Publication date: 2003-01-29
Anticipated expiration: 2021-03-13
Also published as: JP4777584B2; DE10021038C1; JP2003531786A; DK1278641T3; US20030053835A1; ATE372879T1; WO2001083224A1; US6860663B2; DE50113006D1; EP1278641B1; ES2290116T3

Abstract

The printing device comprises a print head unit, a transporting device for the printing material and a structural housing board on which the print head unit and the transporting device are mounted at one end in cantilevered manner and in a predetermined relationship relative to one another. The transporting device comprises a stiff support member which is rigidly connected to the housing board, a mounting member which extends substantially parallel relative to the housing board and is held on the stiff support member, and at least one transport roller for the transportation of the strip of printing material which is mounted at both ends. The stiff support member comprises connecting elements for releasably fixing th mounting member and also guide elements which co-operate with corresponding guide elements of the mounting member for exactly positioning the arrangement with reference to the support member. The first end of the transport roller is mounted at the housing board side and is releasably connected to a drive device and the second end of the transport roller is releasably mounted at the mounting member side.

Description

D R U C K V O R R I C H T U N G

The invention relates to a printing device for printing on a printing material in roll form, in particular label and / or receipt rolls, with a print head unit and a printing material transport device.

The purpose of the printing device (hereinafter also referred to as roll printer or printer) with the printing material transport device is to transport a receipt or label web or label web or the like made of paper or plastic through the roll printer and the printed printing material web after printing to be issued as a print receipt from the printer for manual or automatic acceptance. Depending on the nature of the print document, there are different types of rolls that place different demands on the printing material transport device during transport through the printer. The present invention is mainly concerned with three different types of rolls that can be processed with the device according to the invention:

• Receipt or label rolls with leaking, non-adhesive printing material web.

• Self-adhesive label rolls with a carrier web, the labels being stuck separately on a carrier web.

• Self-adhesive label rolls without carrier web, so-called "linerless" label rolls, with leaking, adhesive printing material web.

With all three types of material web, the radio contact with the printing material web during transport is tion elements of the printing device, in particular printhead, transport rollers, including the printing roller, peeling edge and peeling roller, exposed to high levels of soiling from paper abrasion and sticking adhesive residues. For functional reasons, it is therefore necessary to clean these parts at relatively short intervals. In addition, these parts are also susceptible to wear, so that they have to be replaced after a certain service life.

From WO 98/34791 AI a printer is known in which a thermal print head forms a unit with a firmly connected fixing part, which is held in position by means of a permanent magnet. To replace the print head in the event of a fault or for cleaning, it can be removed without loosening screws, i.e. can be dismantled without tools.

However, the transport rollers for the printing material and the peeling edge cannot be dismantled without tools and without readjustments, and are difficult to access for cleaning.

From US 4,900,175 a pressure roller is known, the hollow axis of which is provided on one side with recesses and a groove. This is inserted in the axial direction into a form-fitting center bore of a drive wheel and engages in the functional position. The pressure roller can be easily dismantled in the axial direction by unlocking the catch.

From DE 40 04 930 AI a printer with an easily removable pressure roller is known. The print roller, which is mounted on both sides in the printer frame, can be removed from the printer by pressing two release buttons perpendicular to the print roller axis. The problem is that with this construction, the replacement or reloading of the printing material is difficult and cumbersome. It is important to have a freely accessible, open side for inserting the printing material web.

The object of the present invention is to be able to easily replace parts of the transport device that come into contact with the printing material web from the freely accessible insertion side of the web, without requiring readjustment.

This object is achieved according to the invention by a printing device for printing on a printing material in roll form, in particular label and / or receipt rolls

- a printhead unit,

- a transport device for the printing material,

a housing board on which the printhead unit and the transport device are held on one side, self-supporting and in a predetermined assignment to one another,

the transport device comprises a rigid support firmly connected to the housing board, a holder which extends essentially parallel to the housing board and is held on the rigid support and at least one transport roller mounted at both ends for the transport of the printing material,

- The rigid carrier has connecting elements for releasably fastening the holder and guide elements which cooperate with corresponding guide elements of the holder for exact positioning thereof with respect to the carrier, and wherein the first end of the transport roller is mounted on the side of the housing board and is detachably connected to a drive device, and the second end the transport roller is releasably mounted on the side of the bracket.

A particularly easy-to-implement and functionally excellent embodiment for the guide elements of the holder and the rigid support offers itself in the form of pins and matching bores. The pins can optionally be provided on the carrier or the holder or also on the carrier and holder, the holder or the carrier then in each case having the bores matching the pin.

The holder can be rod-shaped or plate-shaped.

A particularly preferred embodiment of the holder represents a guide plug-in part which is guided on the rigid support in a form-fitting manner perpendicular to the plane of the housing board. The guide on the carrier is preferably designed in such a way that the guide plug-in part can be moved from a first operating position into a second non-operating position, in which the guide plug-in part is still held on the carrier, but the transport roller is released for service / replacement.

In principle, the guide of the guide plug part can form the guide element on the part of the carrier and the section of the guide plug part sliding in the guide can form the complementary guide element of the holder.

However, it is easier to handle and manufacture, to manufacture the guide of the guide plug-in part with large tolerances and to provide separate guide elements for exact positioning, in particular in the form of the pins described above and matching bores.

In principle, the transport roller can be mounted in such a way that the ends of the transport roller have bearing bushes. engage in the journals on the side of the housing board and the bracket. However, since the transport roller is a wearing part, it is preferably provided with bearing pins at its ends, which can then be used in bearing bushes on the side of the housing board and the holder.

The holder, in particular also in the form of the guide plug-in part, is preferably fixed in the operating position by means of a catch attached to the rigid support. Unlocking the catch allows a particularly easy release and removal of the bracket from the operating position.

The guide plug-in part (or the holder in general), which can be unlocked and removed with a handle, advantageously allows the transport roller and all parts of the transport device that come into contact with the printing material web to be easily removed from the printer without tools for the purpose of cleaning or replacement. Another advantage is that the disassembly and assembly of the parts to be cleaned is carried out from the same side of the printer as the insertion of the roll to be printed with the printing material web.

This side of the printer, which is generally completely enclosed by a printer housing, must be accessible anyway via a housing door or flap for inserting the receipt or label roll. Thus, no further housing parts have to be dismantled for dismantling the parts to be cleaned.

With the printer design according to the invention, all three described label rolls or types of receipt rolls can be processed, in each case optionally with thermal coating, or without thermal coating in connection with an ink ribbon unit or, if appropriate, with other printing processes, such as inkjet processes. The change of the label or receipt roll with the insertion of the printing material web into the printer is very simple and user-friendly due to the self-supporting arrangement of the print head unit and the printing material transport device on the housing board with a single handle operation. If necessary, a lifting of the thermal printhead while simultaneously pivoting away a swivel roller can be associated with this.

The use of an extruded profile as a rigid support for the printing material transport device is a particularly advantageous and inexpensive solution in its embodiment according to the invention. Several functions can be practically realized through the extrusion mold and its molding channels, such as the attachment to the housing board, the guide centering and locking of the bracket (and, if necessary, the guidance of the guide plug-in part) and thus the storage of the transport pressure roller and pull-off roller and the pull-off edge, the attachment and Storage of a light barrier for scanning the printing material web and guiding and fastening a deflector plate for the "linerless" label rolls.

Due to the rigidity of the extruded profile and an additional, one-sided adjustability of the print head support, which may have to be provided, a very good, uniform pressure can be achieved over the entire printing width. Above all, this brings advantages when printing different roll widths.

The processing of different roll widths is made even easier by an additional adjustment option of the pull-off roller. This ensures that regardless of the roll width, the printing material web always runs along the same stop with the edge facing the housing board, so that no adjustment is required when inserting a roll with a changed width. A slidable mounting of the light barrier in a shaped channel of the extruded profile has the advantage of being adjustable over at least half the ax. Printing material web width and thus the possibility of adapting the position of the light barrier to labels that are difficult to scan, the outer shape of which deviates from the rectangular shape. For example, round labels can be processed, which should ideally be scanned approximately in the middle of the label diameter.

The universally applicable printing material transport device also has the advantage of being easy to install or remove in the assembly of the printer production or for the user due to its structure with easily exchangeable parts and parts groups. For example, when using the printer as a simple receipt printer, the light barrier, peeling roller, swivel roller and take-up roller can simply be omitted from the same basic concept of the construction and can be retrofitted later if required.

Due to the simple lateral insertion of the printing material web into the printer and the straight passage of the printing material web between the print head unit and the transport unit without touching parts, the printer is also advantageously suitable for processing "linerless" label rolls.

The only functional requirement is a pressure roller with a non-stick surface coating, an additional deflector that prevents the sticky printing material web from being wrapped around the transport / pressure roller, and an anti-stick coated deflector plate to cover the upper extruded profile surface. These additional measures can either be provided on the printer or can be retrofitted later by simply replacing or installing parts.

These and other advantages of the invention are explained in more detail below with reference to the description and the drawing. The individual shows:

1 is a front perspective view of a printer according to the invention without a printer housing and without a web of printing material,

2A and 2B side views of the printer in the direction of arrow X according to FIG. 1 with highlighted printing material web course,

3 is a perspective view of the printing material transport device according to the invention, with a holder shown in the disassembled position,

4 shows a partial view of the printing material transport device in the direction of arrow Y according to FIG. 3 in partial section,

5 shows a section AA according to FIG. 4.

1 and 2A and 2B show a printer 1 for printing a label or receipt roll web - hereinafter called printing material web 2 - consisting of a printing material transport device 3 and a print head unit 4, both of which are single-sided and self-supporting on the roll side 5 of a housing board 6 of the Printer 1 are attached. The housing board 6 forms part of the to simplify the figures Printer housing, not shown, which surrounds the printer 1 on all sides in a known manner and has a housing door or flap for inserting the label or receipt roll, and an outlet opening for the printed printing material.

The drive 7 for the printing material transport device 3 is arranged on the opposite gear side 8 of the housing board 6 facing away from the roller side 5. The control of the printer, not shown, is also preferably located on this transmission side 8, which is not accessible to the operator.

The print head unit 4 is constructed according to the known prior art and is therefore not described in detail. A thermal printhead 10 is mounted on a rigid printhead holder 9 which is firmly connected to the housing board 6 and can be pivoted about a pivot axis 11. Using a handle 12 and an additional lever mechanism (not shown), the thermal print head 10 can be switched from a printing material insertion position 13 shown in full lines in FIGS. 2A and 2B to a printing position 14 shown in broken lines. As is known per se, the lever mechanism performs a resilient overstroke so that the thermal print head 10 rests with its corresponding spring force with its printing line on a printing roller 15 of the printing material transport device 3. The thermal heating elements 16, which form a printing line in a known manner, lie parallel to the printing roller 15 on the surface of the printing material web 2, which is carried out between the driven printing roller 15, which acts as a transport roller, and the stationary thermal printing head 10 in the direction of the arrow 17. The printing side 18 of the printing material web 2 facing the thermal printing head 10 is provided with a thermosensitive layer which, when the thermal heating elements 16 covering the entire width of the printing material web 2 are activated, as a result of the resulting generated higher temperature turns into a different color and thus creates a print.

In deviation from the so-called direct thermal printing described above, the printer can also be used as a thermal transfer printer by adding a driven ink ribbon. This printing principle is also known in the art. Therefore, the representation of the ribbon and its drive has been omitted. In thermal transfer printing technology, an additional ink ribbon between the thermal print head 10 and the printing material web 2 is moved synchronously and, when the thermal heating elements 16 are activated, color is transferred from the ink ribbon to the surface of the printing material web 2, which has no thermosensitive layer in this printing technology. The design of the printing material transport device 3 and the print head unit 4 basically remain the same when switching from direct thermal printing to thermal transfer printing.

2A and 2B show the course of the clearly highlighted printing material web 2, 2 'or 2 "by the printer 1 in the insertion position 13 of the thermal print head 10. This course varies, however, depending on which of the three has already been described in the description The roll types mentioned in the prior art are to be printed and output as a print receipt:

a) Receipt or label rolls with leaking, non-adhesive printing material web (Fig. 2B)

The printing material web 2 of a receipt or label roll 21 loosely mounted on a dispensing mandrel 19 and laterally fixed with two stops 20 is deflected via a deflection roller 22, then runs between the printing head unit 4 arranged at a distance from one another and the printing material transport device. direction 3 and then for printing between the thermal print head 10 and the printing roller 15 therethrough.

The driven printing roller 15 transports the printing material web 2 further in the direction of arrow 17 to an outlet opening (not shown) of the printer housing, at which the printing document is either separated manually via a knife edge or mechanically by means of a driven cutting device or outside the printer in an additional unit (not shown) a roll is wound up. These can also be self-adhesive labels glued to a carrier web, which run out of the printer as complete strips and are only separated from the carrier web at a later point in time.

b) Self-adhesive label rolls with carrier web (Fig. 2A)

In a known manner, the self-adhesive labels are either glued to one another or spaced apart on the side of a carrier web 23 facing the thermal print head 10. Together with the carrier web 23, the labels form the printing material web 2 ′ shown in FIG. 2A. The course of this web is identical to roller type a) up to pressure roller 15. Immediately after the pressure roller 15, however, the carrier web 23 is sharply deflected around a stationary peeling edge 24. This causes the labels to be separated from the carrier web 23, which, after the peeling edge 24, are dispensed further in the direction of arrow 17 through an outlet opening (not shown) in the printer housing.

The peeling force required to peel off the labels is generated via a pair of rollers arranged after the peeling edge 24, consisting of a driven peeling roller 25 and a swivel roller 26. The carrier web 23 is then if driven winding mandrel 27 wound. To insert a new label roll 21, the thermal print head 10 is pivoted into the insertion position 13 by means of the handle 12. This changeover of the handle 12 simultaneously causes, via a lever mechanism (not shown), the pivoting away of a pivot lever 28 with the pivot roller 26 mounted therein on one side from the printing position shown in dash-dot lines in FIG. 2A to the insertion position shown with full lines, in order to facilitate the insertion of the label web 2 '. After swiveling back into the functional position shown in dash-dotted lines, the swivel roller 26 causes the driven pull-off roller 25 to wrap around about 180 ° and thus a slip-free transport of the carrier web 23. The pressure roller 15 and the pull-off roller 25 have an elastic covering 68 to improve the transport properties Rubber or plastic.

c) Self-adhesive label rolls without carrier tape (“linerless” labels) (FIG. 2B)

The "linerless" label web 2 "is wound with the adhesive surface on the inside on the label roll 21. The outside 18 to be printed is, as is known per se, provided with an additional non-stick coating in order to separate the turns on the supply roll 21 from each other again The course of the label web 2 "through the printer and the output of the print document is the same as for roll type a). The pressure roller 15 thus simultaneously forms the transport roller of the "linerless" label web 2 ".

In contrast to a), however, it must be prevented that the sticky back of the "linerless" label web 2 "sticks to parts of the printer 1 as it passes through. Additional measures known per se are therefore necessary, such as non-stick coating. Layering of the printing roller 15, an additional deflector on the printing roller 15, which prevents it from being wrapped by the adhesive label web 2 "and an anti-adhesive coating on all parts which can come into contact with the adhesive side of the label web 2".

3 to 5, the printing material transport device 3 according to the invention is shown in more detail. The pressure roller 15, which at the same time forms a transport roller for the printing material web 2, 2 ', 2 ", is mounted with its left, first bearing pin 29 in the housing board 6, the bearing pin 29 having a shape that deviates from the circular shape, for example a key surface 30 , which can be inserted without play into a form-fittingly adapted, central bore 31 of a drive wheel 32 and thereby enables a slip-free rotation of the pressure roller 15. The drive wheel 32 is connected to the drive motor 7, for example via a toothed belt (not shown).

The pull-off roller 25 is mounted in the same manner as the pressure roller 15 with its left bearing pin 33 in a rotationally positive manner and centrally with the drive wheel 34 in the housing board 6 by means of ball bearings 59.

Between the pressure roller 15 and the peeling roller 25, a rigid support 35 formed from an extruded profile made of aluminum is fastened on the roller side 5 of the housing board 6 perpendicular to the housing board 6 and has on its underside two dovetail-shaped grooves 36 for receiving a guide plug-in part 37. The guide plug-in part 37 likewise has two projections 38 which fit into the grooves 36 and is thus held displaceably in the rigid support 35 perpendicular to the housing board 6. A leg 39 angled by 90 ° is formed on the guide plug part 37 designed as a sheet metal part and provided with two centering bores 40, in which the guide plug part 37 is fixed in two centering pins 41 when it is pushed into its functional position. The centering pins 41 are pressed into circular segment-shaped channels 42 of the extruded profile 35.

In a further dovetail-shaped channel 43 of the extruded profile 35, a molded part 44 made of plastic is fastened, on which a resilient catch 45 is formed, which engages in a recess 46 of the leg 39 in the functional position when the guide plug-in part 37 is inserted. On bearing 39, two bearing bushes 47, 48 are fastened in alignment with pressure roller 15 and pull-off roller 25, which receive the bearings for the right bearing pin 49 of the pressure roller 15 and the right bearing pin 50 of the pull-off roller 25.

By pressing the easily accessible spring catch 45, the guide plug 37 can be easily unlocked and removed in the vertical direction to the housing board 6. Then the pressure roller 15 and the peeling roller 25 can be removed in the same direction, e.g. for cleaning or in exchange with a new roller.

In order to make the assembly of the rollers 15 and 25 even easier, 50 insertion chamfers 51 are attached to both bearing journals 29, 49 and 33, 50. The two projections 38 for easy insertion of the guide plug-in part 37 are also provided with insertion bevels 52.

On the guide plug-in part 37, a radius-shaped projection 53 is bent up below the pressure roller 15, on the edge of which a straight end piece, the so-called pull-off edge 24, is formed. For these to separate the self-adhesive labels from the carrier web required peeling edge 24, no additional part is therefore required. With their integration in the guide plug-in part 37, this is advantageously stiffened as a result of the radius-shaped projection 53. The insertion of the guide plug 37 is facilitated and the pull-off edge 24 is easy to clean when the guide plug 37 is removed.

An additional fine adjustment for the parallelism of the thermal print head 10 with the printing roller 15 is built into the mounting of the right bearing pin 49 of the printing roller 15, which can be seen best from FIGS. 4 and 5. The bearing bush 47 is fastened in the leg 39 of the guide plug-in part 37 in such a way that it is axially secured by means of a locking washer 54 and can be rotated with difficulty by an additional corrugated spring washer 55 clamped between the leg 39 and the locking washer 54. An additional setting curve 56 is formed on the bearing bush 47, on which the thermal print head 10 rests in the printing position. By rotating the bearing bush 47 and thus the very slowly rising, integrally formed setting curve 56, the parallelism of the thermal print head 10 and the printing roller 15 can be adjusted to one another and the printing result can thus be optimized. The curve 56 forms a stop for the thermal print head 10. This is particularly important when printing on a narrow label roll whose label web 2 "(printing material web) runs eccentrically to the thermal print head 10 in the vicinity of the housing board 6. The curve 56 as a stop prevents the resilient positioning of the thermal print head 10 in the printing position 14, that it tilts on the right side.

Another setting option for the printing material transport device 3 is accommodated in the mounting of the pull-off roller 25. The right bearing journal 50 is mounted in a bearing bushing 48 fastened in the leg 39 of the guide plug-in part 37, which, like the bearing bush 47, is axially secured by means of a locking washer 54 and by an additional, between Leg 39 and lock washer 54 clamped wave spring washer 55 is stiffly rotatable. The bearing bush 48 has a collar 58 located eccentrically to the central bore, so that when the bearing bush 48 is rotated, the pull-off roller 25 executes a slight pivoting movement about its left bearing 59 in the housing board 6, which is designed as a ball bearing. The pivoting of the central axis 60 of the pull-off roller 25, which is normal to the housing board 6, influences the straight course of the printing material web 2 'with the carrier web 23 through the printer 1. A carrier web stop 61 is fixedly attached to the guide plug part 37 at the end facing the housing board 6. The bearing bush 48 is now adjusted so that the edge of the carrier web 23 facing the housing board 6 tends towards the stop 61 and runs slightly against it. As a result, it is advantageously possible to process self-adhesive label rolls of different widths with carrier web (roll type b) without adjusting the bearing bush 48 and without the need for a second carrier web stop on the other edge of the carrier web.

When passing through the printer, the printing material web 2, 2 'and 2 "passes through a fork light barrier 62 for scanning the labels on the carrier web 23, or for scanning pre-prints already on the supply roll 21. The scanning signals are, as is known, from the printer controller for Synchronization of the label outer contour or the existing forms with the print image to be subsequently printed by the thermal print head 10 is used.

To accommodate the fork light barrier 62, a preferably hexagonal shaped channel 63 is formed in the extruded profile 35, into which a bearing bush 64 is pressed on the end face of the extruded profile 35 facing away from the housing board 6. A fork light barrier body 65 is slidably mounted on the circuit board side of the extruded profile 35 in the molding channel 63. gert and partially protrudes through an opening 66 of the circuit board 6 into the gear chamber 8, via a threaded spindle 67 which is mounted in the bearing bush 64 and the housing circuit board 6 and is axially secured, the fork light barrier 62 can cross across the printing material web 2, 2 ¹ or 2 "over one This is particularly advantageous when self-adhesive labels deviating from the rectangular shape, for example round labels, are processed, which should ideally be scanned approximately in the middle of the label diameter.

For the printing of self-adhesive labels without a carrier web ("linerless"), in which all parts which come into contact with the adhesive side of the label web 2 "should have an anti-adhesive coating, the upper surface 69 of the extruded profile 35 must also have an anti-adhesive coating, for example with PTFE. As As an alternative to this, instead of the non-stick coating, the upper surface 69 can be covered with an additional, non-stick-coated deflector plate (not shown) which the deflector plate can be inserted and which is then secured between the housing plate 6 and the leg 39 after the assembly of the guide plug-in part 37.

The exemplary embodiment described for the present invention serves only to illustrate the inventive concept and this also includes other alternative and equivalent exemplary embodiments which will become apparent to the person skilled in the art when reading the described embodiment, e.g. Execution of a simple strip printer with the omission of the light barrier, peel edge, peel roller, swivel roller and take-up roll.

In particular, the above description shows that the printing device according to the invention is constructed and can be equipped that all of the common label types can be processed by the same printing device without retrofitting. Likewise, it can be seen that a printing device initially designed for receipt roll printing can be upgraded easily and without great effort for printing "linerless" label rolls or upgraded to a printer for carrier web labels.

Claims

Patent claims

1. Printing device (1) for printing on a printing material in roll form, in particular label and / or receipt rolls, with

- a printhead unit (4),

- a transport device (3) for the printing material,

- a housing board (6) on which the print head unit (4) and the transport device (3) are held on one side, self-supporting and in a predetermined association with one another,

- The transport device (3) a rigidly connected to the housing board (6) rigid support (35), a substantially parallel to the housing board, on the rigid support (35) held bracket (37) and at least one transport roller mounted at both ends (15) for transporting the printing material (2, 2 ', 2 "),

- The rigid support (35) has connecting elements for the releasable fastening of the holder (37) and guide elements (41) which interact with corresponding guide elements (40) of the holder (37) for exact positioning thereof with respect to the support (35), and wherein the first end of the transport roller (15) is mounted on the side of the housing board (6) and is detachably connected to a drive device (7) and the second end of the transport roller (15) is detachably mounted on the side of the holder (37).

2. Device according to claim 1, characterized in that the guide elements of the carrier (35) and the holder (37) Include pegs and matching holes.

3. Device according to claim 1 or 2, characterized in that the holder is a guide plug-in part (37) which is guided on the rigid support (35) in a form-fitting manner perpendicular to the plane of the housing board (6).

4. Device according to one of claims 1 to 3, characterized in that the transport roller (15) comprises two bearing journals, the first bearing journal being mounted in the housing board and the second bearing journal being mounted in the holder.

5. Device according to one of claims 1 to 4, characterized in that the holder (37) by means of a on the rigid support (35) attached detent (45) is releasably and releasably fixed.

6. Device according to one of claims 1 or 5, characterized in that the transport roller (15) at the same time forms a printing roller (15) for a printhead (10) of the printhead unit (4) lying parallel to it.

7. The device according to claim 6, characterized in that the print head (10) is a thermal print head which resiliently rests on the printing roller (15) with its heating elements (16) forming a printing line.

8. Device according to one of claims 4 to 7, characterized in that the housing plate (6) facing the first bearing pin (29) of the transport roller (15) has a shape (30) deviating from the circular shape, without play in a positively adapted bore ( 31) of the drive device (32) can be pushed in and thereby slip allows free rotation of the transport roller (15).

9. Device according to one of claims 1 to 8, characterized in that the rigid support (35) is formed from an extruded profile, perpendicular to the gear board (6) has positive grooves (36) for slidably receiving the holder (37) and two circular segment-shaped Form channels (42) for receiving centering pin (41) for the exact position fixing of the holder (37).

10. Device according to one of claims 1 to 9, characterized in that a 90 ° angled leg (39) is formed on the holder (37), in which at least one centering hole is made, which when inserting the holder (37) into it Functional position of at least one centering pin (41) is fixed, which is pressed into a circular segment-shaped channel (42) of the carrier (35).

11. The device according to claim 10, characterized in that in the leg (39) of the holder (37) a bearing bush (47) is arranged in alignment with the transport roller (15), which supports the bearing for the second end (49) of the transport roller (15) forms.

12. The device according to claim 10 or 11, characterized in that in the leg (39) of the holder (37) a recess (46) is made, in which a resilient catch (45) in a shaped channel (43) of the carrier (35 ) attached molded part (44) engages.

13. Device according to one of claims 1 to 12, characterized in that a pull-off roller (25) is present, which with one of its bearing journals (33), which has a shape that deviates from the circular shape (30), is free of play can be inserted into a form-fittingly adapted bore (31) of a drive wheel (34) mounted in the housing board (6) and thereby enables the pull-off roller (25) to be driven without slipping.

14. The device according to claim 13, characterized in that in the leg (39) of the holder (37) a bearing bush (48) is mounted in alignment with the pull-off roller (25), which supports the bearing for a second bearing pin (50) of the pull-off roller (25) forms.

15. The apparatus according to claim 14, characterized in that on the two bearing journals (29, 49) of the transport roller (15) and the two bearing journals (33, 50) of the pull-off roller (25) insertion chamfers (51) are attached and the two projections ( 38) are provided with chamfers (52).

16. The device according to one of claims 10 to 15, characterized in that the holder (37) for stiffening has a radius-shaped projection (53) which runs parallel to the transport roller serving as a pressure roller and at the edge of which a pull-off edge (24) for the Separation of the self-adhesive labels from the carrier web is formed.

17. The device according to any one of claims 5 to 16, characterized in that one of the bearings (47) of the transport roller (15) serving as a pressure roller is designed to be stiffly rotatable and an adjustment curve (56) is formed thereon on which the thermal print head (10 ) rests in its printing position, the parallelism of the thermal print head (10) to the transport roller (15) being adjustable by rotating the bearing (47).

18. Device according to one of claims 13 to 17, characterized in that a stiff rotatable bearing bush (48) for mounting the second bearing pin (50) of the pull-off roller (25) is present, which has a collar extension (58) eccentrically to the bearing point, the pull-off roller turning the bearing bush (48) slightly pivoting about its first bearing pin (59 ) in the housing board (6).

19. The device according to claim 18, characterized in that the course of the printing material (2 ') by the printer (1) with rotation of the bearing bush (48) is adjustable so that the left, the housing plate (6) facing edge of the carrier web ( 23) abuts a carrier web stop (61) fastened to the holder (37).

20. Device according to one of claims 1 to 19, characterized in that a fork light barrier (62) on the carrier (35) perpendicular to the housing board (6) is slidably mounted.

21. The apparatus according to claim 20, characterized in that the fork light barrier (62) via a threaded spindle (67) is adjustable perpendicular to the housing board (6).

22. Device according to one of claims 6 to 21, characterized in that the transport roller (15) functioning as a pressure roller has an elastic coating (68) which is provided with a non-stick coating for transporting a self-adhesive label web (2 ") (linerless) is.

23. Device according to one of claims 1 to 22, characterized in that an upper surface (69) of the carrier (35) is provided with a non-stick coating, for example PTFE.

4. The device according to claim 23, characterized in that on the upper surface (69) two mold channels (70) are provided for receiving a non-stick coated deflector plate.