EP0631959A1 - Exchangeable cassette for a manual device for transferring a film from a carrying ribbon to a substrate - Google Patents

Abstract

An exchangeable cassette for a manual device for transferring a film from a backing strip (52) onto a substrate has a cassette housing with two side walls (14, 15) between which there is seated a supply spool (54) for the backing strip (52), which supply spool runs from there in a loop (62) to a winding spool. In this case, the supply spool (54) and winding spool lie coaxially with one another, but on different sides of one side wall (16), so that the winding spool with the used backing strip (52) lies outside the cassette housing and can readily be removed. The cassette housing, a strip-guiding element (60) located therein, the supply-spool core (56) and tongues (26) which enclose the loop (62) from the outside in a protective manner all consist of the same material, preferably of cardboard. <IMAGE>

Description

The invention relates to an exchangeable cassette for a hand-held device for transferring a film from a carrier film to a substrate, according to the preamble of claim 1.

Such an exchangeable cassette and such a hand-held device are known from DE 37 36 357 C1 of the applicant. In this interchangeable cassette, a supply reel for the carrier film and a take-up reel are arranged side by side and rotatable; In addition, the interchangeable cassette contains a force-absorbing application foot which transfers the pressure forces applied by the user to the carrier tape for pressing it onto a substrate and localizes a loop of the carrier tape during transport.

The individual components of the known interchangeable cassette each consist of different materials adapted to the corresponding purpose. When the used exchangeable cassette is disposed of, it has to be collected, stored temporarily and then disassembled in a complex manner so that the individual components can be sorted according to their material and can be sent to the respective destruction or material recovery; an exception is the used carrier tape wound on the take-up reel spool, in which unwinding is too cumbersome, so that the full take-up spool is probably regularly fed to the usual mixed waste, such as household waste. In addition, the known interchangeable cassette requires a relatively large amount of material for its manufacture; overall, it is not very environmentally friendly.

Starting from this prior art, the invention is based on the object of improving the environmental friendliness of the known exchangeable cassette.

This object is solved by the features of claim 1.

Here, the invention first uses the known coaxial arrangement of the two coils, but arranges the take-up reel outside the cassette housing, so that it only has to be dimensioned such that it encloses the full supply reel; it is therefore practically only half the size of the cassette housing of the generic replaceable cassette, which already leads to substantial material savings.

Furthermore, the interchangeable cassette according to the invention no longer contains, like the known one, an application foot, but two tongue-like extensions of the cassette housing, which grip around the loop of the carrier tape from the outside and thus localize it, so that the loop of the carrier tape is only transferred when it is inserted into the housing of the hand-held device is put on this attached application foot.

The end of the carrier tape is releasably attached to the core of the supply reel, so that when the interchangeable cassette according to the invention is completely used up, the carrier tape detaches from the supply reel core without residue and is released from the cassette housing.

The take-up spool according to the invention is not only located on the outside of the cassette housing, but is detachably attached there, and all parts of the exchangeable cassette according to the invention are made of the same material, with the exception of the carrier tape and possibly the take-up spool core.

If the used exchangeable cassette is removed from the hand-held device, the full take-up reel can be easily separated from the cassette housing; However, this, with its inner parts, consists of uniform material and can therefore be sent to suitable disposal or material recycling without further material separation.

The full take-up reel, as before, goes into mixed waste or household waste, for example.

In addition, the walls of the interchangeable cassette according to the invention no longer have to be designed to absorb force, in order to transmit the pressing forces from the hand-held device to the application foot. Rather, they can be made from a less stable but more environmentally friendly material or with a smaller wall thickness (compared to the generic exchangeable cassette).

However, the interchangeable cassette according to the invention cannot be used in the known device mentioned at the outset, but is intended for a device in which an applicator foot is already present on the device, via which the loop of the carrier tape can then be slipped over when the interchangeable cassette is inserted, and also when The removable cassette on the device housing remains.

The cassette housing can be designed as a three-dimensional injection molded part; For better material savings and for the purpose of using environmentally friendly, non-pourable materials, however, the cassette housing according to a preferred embodiment of the invention is designed as a folding body which is produced by folding a flat body which has prefabricated bending or kinking points.

According to a preferred embodiment of the invention, this flat body can be made of plastic, for example by injection molding, the absence of any angles in which there is inevitably a greater wall thickness making it possible to manage with a minimum amount of material.

According to a further preferred embodiment of the invention, the flat body is designed as a cardboard blank, in which the bending points are designed as folds or scoring points. The first advantage of such a design is that it can be cold by punching and thus save energy. The second and essential advantage of cardboard as a material for the cassette housing and thus also for the parts in it is the universal disposability of cardboard by recycling, incineration, rotting in a landfill, etc.

In addition, the wall thickness of the cardboard can be small, since the housing walls need hardly absorb any forces during use.

The cardboard blank can be cut lengthwise from a narrow cardboard tape, diagonally staggered side by side in a row from a wider cardboard tape or staggered in several successive rows from a cardboard sheet with very little waste.

A preferred embodiment of the interchangeable cassette according to the invention consists in the fact that the two side walls of the cassette housing each have a main section which overlaps the supply reel and is preferably approximately circular and an extension which carries the tape guide element and the tongues.

When designing the interchangeable cassette according to the invention as a folded body from a pre-formed sheet, it is advantageous if the unfolded sheet has the two main sections lying next to one another, these being connected to one another by a spacer strip, the ends of which are preferably designed as stiffening tabs projecting on both sides, with the two projections on sides of the main sections facing away from one another and each have two converging strips on their sides facing away from one another, which strips are arranged and designed such that when the folding body is finished, two strips each lie flat against one another to form a stiffened tongue. The arrangement of strips which are glued or pressed together as tongues which are intended to protect the loop is particularly advantageous since this area of the exchangeable cassette according to the invention must be particularly stable in order to ensure good localization of the loop on the one hand and damage or impairment of the loop on the other Avoid pulling off the carrier tape when in use.

Particularly preferably, the cassette housing has, in addition to the top and bottom side walls, a bottom lying underneath their extensions and parallel to them, which is at a distance from the adjacent side wall which corresponds essentially to the height of the core of the take-up reel, and that the bottom only extends so far to the core of the take-up spool that it unhindered in the filled state from Cassette housing is removable. Advantageously, the tape guide element is designed as a rotatable cylindrical roller that sits between the upper side wall and the floor and penetrates a play hole in the lower side wall. The cylindrical roller is preferably designed as a hollow cylinder and a projection, preferably designed as a bead, for centering the hollow cylinder is arranged in the underside of the upper side wall, the bottom having a recess whose free diameter is at least as large as the inside diameter of the hollow cylinder, but smaller than it Outer diameter. Due to the specified measures, the base supports and holds the preferably cardboard cylindrical roller for deflecting the carrier tape, so that it can be easily placed on an associated, device-specific mandrel when inserted into the device, which requires the use of special devices for axially fixing the cylindrical roller superfluous. For this reason, a centering hole for receiving a centering pin on the device is preferably formed in the extension of the side wall below, under which a corresponding recess is provided in the base.

In a further advantageous embodiment of the interchangeable cassette according to the invention, the lower side wall has at least three, preferably four, upward-pointing beads which support the full supply spool radially on the outside and thereby center it. This eliminates the use of separate components for holding and centering the full supply spool. Advantageously, a bead is provided on both sides of the spacer strip to support a stiffening tab.

Another, also preferred embodiment of the interchangeable cassette according to the invention is that the edge region of the push-through opening is cut in the underlying side wall to form holding tabs which can be bent downwards, and that the diameter of the take-up spool core is at least twice the radial width of these holding tabs larger than the free diameter the push-through opening, and that the downwardly bent retaining tabs engage in the take-up spool core. In this embodiment, the take-up spool core is held by means of tabs, which can be pushed back by a device-side pivot pin when the interchangeable cassette is inserted into the handheld device: this makes it possible First, the holder of the take-up reel core on the housing without a separate component and at the same time allows the automatic separation of the cassette housing from the full take-up reel after the exchange cassette has been used up, namely when these tabs have been pushed back when inserting the exchange cassette according to the invention into the associated hand-held device. The coordination of the reel diameter according to the invention makes it possible to dispense with separate gear elements on the hand-held device and their counterparts on the interchangeable cassette and ensures that the full take-up reel remains in the device when the cassette housing is removed. The material is separated automatically and cannot be avoided due to volatility.

Particularly preferably, a finger is formed at the ends of each retaining tab, which engages behind the take-up spool core.

In a further advantageous embodiment of the interchangeable cassette according to the invention, a viewing window associated with the winding of the supply reel is formed in the upper side wall. This also contributes to environmental friendliness by the user recognizing whether the carrier film has already been used up or not, which can prevent the interchangeable cassette from being removed prematurely from the hand-held device and either tearing off the carrier tape or a part thereof remaining in the cassette housing, or that the take-up reel remains connected to the cassette housing via the carrier tape.

In the exchangeable cassette according to the invention, the outer diameter of the take-up spool core is particularly preferably made larger than that of the full supply spool. Since both coils sit on one axis and therefore the drive movement of the supply reel caused by the removal of the carrier tape is transmitted to the take-up reel at the same speed, a good tension of the carrier tape can always be achieved when a suitable slip clutch is interposed between the two.

The invention is explained in more detail below in principle by way of example with reference to the drawing.

• Fig. 1 einen Pappzuschnitt zur Herstellung eines Faltkörpers, der eine Ausführungsform des erfindungsgemäßen Kassettengehäuses bildet;
• Fig. 2 eine aus dem Pappzuschnitt der Fig. 1 hergestellte Wechselkassette im Schrägbild und in Explosionsdarstellung;
• Fig. 3 die Pappkassette der Fig. 2 im Schrägbild;
• Fig. 4 eine erfindungsgemäße Wechselkassette in einer Darstellung wie in Fig. 3, jedoch aus Kunststoff;
• Fig. 5a einen Längs-Teilschnitt durch ein Handgerät mit eingesetzter erfindungsgemäßer Wechselkassette;
• Fig. 5b eine Draufsicht auf das offene Gehäuse des Handgerätes der Fig. 5a;
• Fig. 5c einen vergrößerten Ausschnitt aus Fig. 5a;
• Fig. 6 eine Schräg-Draufsicht auf das offene Gehäuse des Handgerätes mit einer soeben verbrauchten erfindungsgemäßen Wechselkassette;
• Fig. 7 eine Schräg-Draufsicht auf das dem Gehäuse des Handgerätes in Fig. 6 entnommene leere Kassettengehäuse, und
• Fig. 8 eine Schräg-Draufsicht auf das offene Gehäuse des Handgeräts nach Entnahme des leeren Kassettengehäuses, wobei die volle, im Gehäuse des Handgerätes verbliebene Aufwickelspule zur Entnahme bereitliegt.

Show it:

• 1 shows a cardboard blank for producing a folding body which forms an embodiment of the cassette housing according to the invention;
• FIG. 2 shows an interchangeable cassette made from the cardboard blank of FIG. 1 in an oblique view and in an exploded view;
• 3 shows the cardboard cassette of FIG. 2 in an oblique view;
• 4 shows an exchangeable cassette according to the invention in a representation as in FIG. 3, but made of plastic;
• 5a shows a longitudinal partial section through a hand-held device with an exchangeable cassette according to the invention inserted;
• FIG. 5b shows a plan view of the open housing of the handheld device of FIG. 5a;
• 5c shows an enlarged detail from FIG. 5a;
• 6 shows an oblique plan view of the open housing of the hand-held device with a replacement cassette according to the invention that has just been used up;
• Fig. 7 is an oblique plan view of the empty cassette housing removed from the housing of the hand-held device in Fig. 6, and
• 8 is an oblique top view of the open housing of the hand-held device after removal of the empty cassette housing, the full take-up spool remaining in the housing of the hand-held device being ready for removal.

The same reference numerals denote the same elements throughout the figures; the description of such elements in connection with a figure is also essentially valid for the elements with the same reference numerals in all other figures.

In the figures, as in the preceding description and in the claims, a basic position of the exchangeable cassette or the Handheld device in which this or this lies flat on a flat surface, the take-up spool is below the supply spool; Terms such as "top" and "bottom" refer to this basic position.

1 shows the top view of a cardboard blank 10 which can be folded into a cassette housing (FIG. 2).

All solid lines form the contours of the cardboard blank 10, while the dashed lines represent fold lines or scoring lines 12 which are formed during or after the cardboard blank 10 is punched out, for example from a cardboard sheet, and define folds or kinks.

The cardboard blank 10 has two circular main sections 18 with an outer contour of substantially the same size, which are connected to one another by a short, wide spacer strip 22, the two free outer edges of which are each extended in the direction of its width by a stiffening opening 24 tangential to the circumference of the two main sections 18 .

After folding the cardboard blank to form a folding body, one main section 18 forms the side wall 14 on the top, the other the side wall 16 on the bottom.

The main section forming the upper side wall 14 is extended on the side of its circumference opposite the spacer strip by an isosceles-trapezoidal extension 20 which tapers away from the circumference; Along its legs extend strips 26 lying outside the extension 20, the inner ends of which lie at the base of the extension 20 and the outer ends of which abut one another, with a radial stamped cut running to the nearest main section 18 running between the outer ends and between the and the extension 20 gussets limited on both sides by the strips 26 are left out.

In the extension 20 there is a cross-shaped stamping 32, which is pushed through and in the final state forms a downwardly projecting bead which engages in the center of the inside diameter of a hollow cylindrical deflection roller 60 (cf. FIG. 2).

The other, the lower side wall 16 forming main portion 18 has on the side facing away from the spacer 24 an extension 20 opposite extension 20 ', which corresponds in its contour to this, but is laterally recessed at its base distal end to enable other cut parts .

At the point corresponding to the punching of the first extension 20, the second extension 20 'has a circular punching 30, which is penetrated by the pulley 60 with play after completion of the housing. In addition to this punch 30 there is a second circular punch 34 with a smaller diameter, which is pushed onto a housing-side centering pin (not shown) when the finished housing is inserted into a hand-held device (FIGS. 5a to 5c).

On the side of the extension 20 having side recess is an engaging portion in the recess with an essentially isosceles triangular outline, which corresponds to the contour delimited by the two strips 26, attached to the extension 20 of the upper side wall 14 and a recessed, has isosceles triangular gusset, from the tip of which a die cut runs to the outline of the section.

The strips of material formed between the outline and gusset on the legs form strips 26 ', which essentially match the strips 26, while the base-side strip of material forms a bottom 28 after folding, which extends parallel to the upper side wall 14 and the lower side wall 16 and is below the latter (see FIG. 2).

This base-side material strip is cut out in an arc shape on its outside, the curvature corresponding approximately to that of the circumference of the full take-up reel (FIG. 8).

From this arcuate outline, two adjacent cutouts 36, 38 each end in a radius, which after folding are located under the bores 30, 34. After inserting the exchangeable cassette into a hand-held device, the centering pin on the device side passes through the recess 38, while the recess 36 is penetrated by a device-side mandrel which engages with play in the interior of the deflection roller 60; the nearby centering pin ensures that the cassette in the hand-held device can never move so far that the rotation of the deflection roller 60 is inhibited by the mandrel.

Both main sections 18 have a central, essentially circular punching; the main section 18 forming the upper side wall 14 is provided with a fixing opening 44 which is held through in the hand-held device by a device-side fixing sleeve 72 (cf. e.g. FIG. 6); A viewing window 50 extends from the fixing opening 44 in the direction of the spacer strip 22 and lies above the winding on the supply spool 54 (see FIG. 2) and enables the determination of whether and how much carrier tape 52 is still on the supply spool core 56 (see FIG Fig. 2); this prevents inadvertent attempts to remove the housing of the interchangeable cassette from the handheld device before the carrier tape 52 has been completely used up, because in this case the main advantage of the interchangeable cassette - the material separation when thrown away - would not be realized.

The main section 18 forming the lower side wall 16 has a push-through opening 42, the edge of which is surrounded at a distance by a series of punched cuts which delimit three holding tabs 46 which extend in the circumferential direction and are connected to the cardboard blank by a straight fold Extension of the holding tab is inclined and extends at its end remote from the holding tab parallel to a tangent corresponding to this point to the push-through opening 42.

The free ends of the retaining tabs 46 each have a finger 48 pointing approximately radially away from the push-through opening 42.

The radial width of these retaining lugs 46 is determined such that, when they are pressed downward, they lie inside a winding core 58 arranged below the side wall 16 below and coaxially with the supply spool 54, are slightly jammed with it and connect it from below with the Reach behind fingers 48 (see FIG. 2).

If, when inserting the interchangeable cassette into the hand-held device, a device-side pivot pin 70 (FIGS. 5a and 5c), which is rotatably seated on the carrier sleeve and onto which the supply spool core 56 is to be press-fitted, is first inserted into the inside of the take-up spool core 58, then he pushes back the retaining tabs 46 with his forehead; a shoulder of the pivot pin 70 then lies against the retaining tabs 46 from below and brings them back into the plane of the uncovered side wall 16.

The main section 18 forming the underlying side wall 16 also has four punched-in or beads 40 arranged with the same radial and angular spacing, which are pressed in upward and encompass the full supply spool 54 in a localizing manner.

Two of these stampings are on both sides near the spacer 22; after folding, the stiffening tabs 24 on the spacer strip 22 are moved towards the adjacent, upwardly pressed stamping, which forms a gradually increasing and abruptly decreasing contour toward the center of the lower side walls, runs over this contour and engages behind it, so that the two angled stiffening brackets 24 simultaneously form tangential support walls for the full supply reel 54 and stiffen the cassette housing by forming a support between the top (14) and bottom side wall (16) (see FIG. 2).

Figures 2 and 3 show the finished interchangeable cassette in an oblique view, Fig. 2 additionally in an exploded view.

To produce the cassette housing, the cardboard blank 10 shown in FIG. 1 is angled along the fold or scoring lines 12. The full supply spool 54 is sandwiched between the two side walls 14, 16 and is located in its position by the beads 40 and the stiffening tabs 24, but without being impaired in their rotatability.

The cylindrical roller 60 is rotatably inserted into the play bore 30, centered by the bead 32 and held between the side wall 14 and the floor 28 lying above.

Of the four strips 26, those which lie one above the other when the cardboard blank 10 is folded are folded over so that they adjoin one another and are glued or squeezed together. This results in stiff tongues which are so angled relative to the rest of the cassette housing to which they are attached with one end that they converge and leave a gap between their other ends.

The carrier tape 52 wound on the supply reel 54 runs from the supply reel 54, wraps around a circumferential section of the cylindrical roller 60, then runs into the region delimited by the two tongues 26, turns around near the free ends of the tongues 26 to form a loop 62, and runs back to the cylindrical roller 60, around it under the run-off from the supply reel 54 and towards the take-up reel core 58, onto which it is wound and which rotates in the same direction as the supply reel 54.

As shown in FIGS. 5a, 5b, 6 and 8, the hand-held device has a displaceable application foot 66 which is displaceable between a position which has been retracted into the hand-held device and an extended position.

The dimension of the loop 62 is determined so that in the retracted position of the applicator foot 66 surrounds it with a large distance when the interchangeable cassette is inserted, but lies tightly around its free end when the applicator foot 66 is extended.

The two spool cores 56, 58 sit on the two separate sections of the pivot pin 70, namely the supply spool core 56 with a press fit and the winding spool core 58 with a narrow play fit, which allows a slip clutch effect. Since the diameter of the take-up reel arm 58 is always larger than that of the winding on the supply reel core 56, and since the pivot pin 70 rotates at the same speed as the supply reel 54, the take-up reel core 58 always seeks the carrier tape 52 as a result of the slip clutch connection to the pivot pin 70 to pull tight.

The supply reel 54 is driven by pulling off the carrier tape 52 when it is guided over a substrate to be coated by the pressure movement of the application foot 66.

The dimension of the gap between the free ends of the tongues 26 results from the described mode of action.

The end of the carrier tape 52 is attached to the supply spool core 56 in such a way that it comes free of it when it is only in one position around it or has been completely used up. In any case, no remainder of the carrier tape 52 remains on the supply spool core 56.

As described above, the take-up reel core 58 is no longer in holding engagement with the cassette housing after inserting the exchangeable cassette, but in a defined frictional engagement with the housing-side pivot pin 70.

If the empty interchangeable cassette is now removed from the device housing 68 (FIG. 5a, c, 6, 8) (FIG. 6), the full take-up spool core 58 remains in the hand-held device (FIG. 8) because it is frictionally connected to the pivot pin 70 is held back. The user therefore only has the empty cassette housing in hand, which is shown in FIG. 7. Due to its arcuate contour, the bottom 28 does not prevent the full take-up reel from being released.

The full take-up spool is then removed separately from the hand-held device and can be disposed of with household waste, since in any case it is only a very small amount of plastic.

Now all components of the empty cassette housing, namely the folding body, the supply spool core 56 and the cylindrical roller 60, consist of the same material and can therefore be disposed of without further disassembly.

If the interchangeable cardboard cassette is made, the empty housing can be handed over for waste incineration or for recycling; in the case of plastic, the empty housing can be immediately recycled.

In principle, however, it is also possible to match the material of the take-up spool core 58 to the material of the carrier film strip 52 in such a way that the full take-up spool can also be returned to a recycling point without further material separation.

In the case of the plastic version, a flat body can be produced in die-casting, as shown in FIG. 1, with film hinges instead of the fold or scoring points 12 and with molded projections instead of the stampings 32, 40.

The plastic cassette housing can also consist of several parts that are attached to each other, e.g. put together, are; overall, however, this housing has the same features as the cardboard embodiment shown and described.

Such a plastic housing is shown in Fig. 4 and has a supply spool core 56 and a (not visible) cylindrical roller each made of the same plastic as the other housing parts 14, 16, 22, 26 and 28, which in principle all have the same numbering in cardboard 3 correspond to the cassette.

Claims (16)

Exchangeable cassette for a hand-held device for transferring a film from a carrier tape to a substrate, with a cassette housing which has two mutually parallel side walls, between which a supply spool with a supply spool core is provided, wherein a through-opening for a device-side pivot pin assigned to the supply spool core is provided in the side wall the free diameter of which is at least as large as the inside diameter of the supply spool core, but which is too small to allow the supply spool core to pass through, and the carrier tape coming from the supply spool is guided in the cassette housing via at least one tape guide element which runs essentially axially parallel to the supply spool core, runs out of the cassette housing and, after forming a loop, is guided to a take-up reel with a take-up reel core, and with a loop localization device arranged on the housing, with which the orientation of the loop with respect to the housing can essentially be determined, characterized in that the supply (54) and the take-up spool are arranged coaxially to one another, but on different sides of the side wall (16) having the push-through opening (42), the inner diameter of the take-up spool core (58) is larger than that of the supply reel core (56) and the take-up reel core (58) is detachably attached to the outside of the side wall (16),
the tape guide element (60) is arranged in such a way that it extends on both sides of this side wall (16) in such a way that it extends essentially over the height occupied by the spool core (56, 58) on the relevant side,
the loop-locating device comprises two loops (62) on their two sides, each encompassing the outside, projecting from the cassette housing and converging along the loop sides There are tongues (26), the ends of which are at a distance from one another which allows the loop (62) to be pulled through,
the end of the carrier tape (52) is releasably attached to the supply spool core (56) and
Cassette housing, supply spool core (56), tape guide element (60) and tongues (26) consist of the same material. Interchangeable cassette according to claim 1, characterized in that the housing with the side walls (14, 16) and the tongues (26) are formed as folding bodies from an essentially flat surface body (10) formed with prefabricated bending or kinking points (12) . Interchangeable cassette according to claim 2, characterized in that the flat body is an injection molded plastic body, the bending points of which are designed as film hinges. Exchangeable cassette according to claim 2, characterized in that the flat body is a cardboard blank (10), the bending points of which are designed as fold and / or scoring points (12). Interchangeable cassette according to one of claims 1 to 4, characterized in that the two side walls (14, 16) of the cassette housing each have a main section (18), preferably approximately circular, overlapping the supply spool (54) and an extension (20) which overlaps the supply spool (54) Band guide element (60) and the tongues (26) carries. Interchangeable cassette according to claim 5 in conjunction with one of claims 2 to 4, characterized in that the unfolded sheet (10) has the two main sections (18) lying side by side, which are connected to one another by a spacer strip (22), the ends of which preferably protrude on both sides Stiffening tabs (24) are formed, the two extensions (20) being arranged on sides of the main sections (18) facing away from one another and each having two converging strips (26) on their sides facing away from one another, which are arranged and designed in this way are that when the folding body is finished two strips (26) lie flat against each other to form a stiffened tongue. Exchangeable cassette according to one of claims 5 or 6, characterized in that the cassette housing has, in addition to the side wall (14, 16) above and below it, a base (28) lying underneath its extensions (20) and parallel to it, which is adjacent to the side wall (16 ) has a distance which corresponds essentially to the height of the take-up spool core (38), and that the bottom (28) only extends so far to the take-up spool core (58) that the take-up spool can be removed from the cassette housing unhindered in the filled state. Interchangeable cassette according to claim 7, characterized in that the tape guide element is designed as a rotatable cylindrical roller (60) which sits between the upper side wall (14) and the bottom (28) and passes through a play bore (30) in the lower side wall (16). Exchangeable cassette according to claim 8, characterized in that the cylindrical roller is designed as a hollow cylinder (60), that in the underside of the upper side wall (14) there is a projection, preferably designed as a bead (32), for centering the hollow cylinder (60), and in that the bottom (28) has a recess (36) whose free diameter is at least as large as the inside diameter but smaller than the outside diameter of the hollow cylinder (60). Exchangeable cassette according to one of claims 8 or 9, characterized in that in the extension (20) of the lower side wall (16) a centering hole (34) is formed for receiving a centering pin on the device, under which a corresponding recess (38) in the bottom (28) is provided. Interchangeable cassette according to one of claims 1 to 10, characterized in that the lower side wall has at least three, preferably four, upwardly pointing beads (40) which support the full supply spool (54) radially from the outside and thereby center it. Interchangeable cassette according to claim 11 in conjunction with claim 6, characterized in that a bead (40) is arranged on both sides of the spacer strip (22) for supporting a stiffening tab (24). Interchangeable cassette according to one of claims 1 to 12, characterized in that the edge region of the push-through opening (42) is cut in the underlying side wall (16) to form holding tabs (46) which can be bent downwards, that the diameter of the take-up spool core (58) by at least that twice the radial width of these holding tabs (46) is greater than the free diameter of the push-through opening (42) and that the downwardly bent holding tabs (46) engage in the take-up spool core (58) in a holding manner. Exchangeable cassette according to claim 13, characterized in that a finger (48) is formed at the ends of each retaining tab (46) which engages behind the take-up spool core (58). Exchangeable cassette according to one of claims 1 to 14, characterized in that a viewing window (50) associated with the winding of the supply reel (54) is formed in the side wall (14) above. Interchangeable cassette according to one of claims 1 to 15, characterized in that the outer diameter of the take-up reel core (58) is larger than that of the full supply reel (54).

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