EP0680914B1 - Device for dispensing a transfer material - Google Patents

Description

The invention relates to a device for dispensing on a carrier strip provided, in particular adhesive application material on a surface according to the preamble of claim 1. Such a device is known from DE-A-42 20 712.

EP-A-0 362 697 describes a further device for dispensing on a carrier strip provided order material known, in which dispenser and take-up spool are connected to one another via a friction wheel gear device. To rotate the delivery spool in a direction opposite to the delivery rotation direction To prevent direction, a backstop is provided, the one Locking pin comprises, in the event of a rotational movement of the dispensing spool in one of the Delivery direction opposite direction runs up on a wedge surface while doing so the dispensing spool with an axis provided for mounting the dispensing spool locks. The assembly of such a conventional device requires special Care and is difficult to automate. From US-PS 3 969 181 is a device for dispensing an adhesive film be

knows the one pair of coils inside a device housing with a Dispensing spool and a take-up spool comprises. The take-up spool is included via a brush element attached to a radial side surface of a drive wheel coupled to the delivery spool. The device is for use in industrial Area provided and of correspondingly complex structure.

DE-OS 36 38 722 is a further device for applying an adhesive film known. This device includes a housing and a pair rotatable therein movably arranged coils, which via a gear transmission mechanism and a coupling with resiliently deflectable spring claws together are geared. In addition to the form and production technology for a mass article This device also proves to be relatively complex in terms of components its rolling characteristics as unfavorable. On the one hand, the tension fluctuates in one, pulled off from one of the coils, to the other an unpleasant noise when rolling.

The invention has for its object a device of the aforementioned Art to create, which is easy from a design and assembly point of view and is inexpensive to produce, which has a harmonious rolling characteristic and which is characterized by a particularly favorable usability.

This object is achieved by a device with the in claim 1 specified features solved.

This advantageously makes it possible to have a particularly simple structure To create device for the delivery of order material, which is characterized by a distinguishes uniform carrier strip tension during a tape pull-off process.

Advantageous further developments are specified in the subclaims.

A particularly advantageous embodiment of the device according to the invention is given that the friction wheel element is arranged coaxially to the take-up spool is. This advantageously makes it possible to use the friction wheel element to form a relatively small component and thus with low material consumption. Also with regard to the lateral stability of the friction wheel element, it proves to be a relatively compact one Design of this component as particularly advantageous.

In a particularly advantageous manner, the counter wheel is coaxial with the delivery coil arranged. This makes it possible to use one for storage the trunnion provided the trunnion also the counter wheel to store. The counter gear is advantageous here integrally formed with the delivery spool.

The outer diameter of the Friction wheels are essentially the same diameter as one for receiving of the carrier strip provided band core. With a corresponding Dimensioning the diameter of the counter wheel larger than that Outside diameter of a carrier strip roll in the unused condition a particularly favorable transmission ratio results automatically. This transmission ratio is always measured that the take-up spool strives to make a longer one Coil section as it unrolled from the dispenser roll becomes. With the dimensioning of the Friction wheel outer diameter corresponds in a particularly simple manner the tensile force effective in the carrier strip essentially equal to the frictional force transmitted between the friction wheel element and the counter wheel. The tensile force can therefore be predetermined extremely precisely not dependent on the elasticity of the other transmission elements. (This elasticity is due to the type of plastic as well as Form process parameters, especially cooling and injection duration dependent.)

A particularly advantageous embodiment of the invention Device is also given in that the outer radius of the Friction wheel is smaller than the radius of curvature of the surface section the mating wheel on the friction wheel. It is also possible, the friction wheel on a hollow cylinder inner surface of the counter wheel to couple, thereby disposing the dispenser and take-up spool is possible in a side-by-side manner.

A particularly favorable development of the device according to the invention is given by the fact that the friction wheel element as a rectangular torus is designed because such a friction wheel element is special is easy and inexpensive to manufacture. Advantageously the rectangular torus has a cross-sectional width in the axial direction which is less than a radially extending one Cross-sectional height. This cross-sectional height corresponds to advantageously substantially half the inner diameter of the friction wheel element.

A particularly favorable embodiment of the device according to the invention is given in that the friction wheel element under elastic Widening to an intercept, in particular the take-up spool is put on. Such a placement of the friction wheel element ensures particularly safe torque transmission on the take-up spool. However, it is alternatively also possible that the friction wheel element has an inner diameter which is larger is as an axle section provided for receiving the friction wheel element. With such a design of the friction wheel results one of the embodiment stuck on the take-up spool Friction wheel element different transmission ratio between the two coils.

In a particularly advantageous manner, the friction wheel element is an O-ring educated. Such a friction wheel element is particularly simple and inexpensive to manufacture or available as a standard part. In advantageous The friction wheel element consists of an elastic one Material with a high surface friction coefficient, especially rubber. It is also possible to remove the friction wheel element to produce a foamed material, which is not only the Influence inherent elasticity of the friction wheel element in an advantageous manner leaves, but also the material consumption in the manufacture of the friction wheel element can be reduced.

Another particularly advantageous embodiment of the invention Device is provided in that the take-up spool an axis section for receiving the friction wheel element and one Axis section for receiving a tape core includes. In advantageous The way is between the said axis sections a manually operated tensioning wheel is provided. One trained in this way In terms of production technology, the take-up spool is particularly simple producible, and enables a particularly simple refilling of the Contraption.

A particularly advantageous embodiment of the delivery coil The device according to the invention is given in that the Delivery coil the counter wheel and an axle section for receiving a Band core includes. Such a delivery spool is similar in FIG advantageously as the above-mentioned take-up spool producible.

A particularly elegant embodiment from an aesthetic point of view the device according to the invention is given that a contact portion between the friction wheel element and the counter wheel is covered by the tension wheel. Thereby the mechanism according to the invention has a closed external appearance. A completely uncovered radial side surface of the tensioning wheel can then be shown with large symbols for the direction of rotation (Arrows) are marked.

A particularly advantageous embodiment of the invention Device is given in that the axis of the take-up roller arranged in a housing area adjacent to an application device is. This makes it possible to use the device according to the invention to realize particularly small and a special to realize favorable carrier strip course without deflection rollers. Advantageously, the axis of the discharge roller is Applicator arranged further apart than the axis the recording role. Such an arrangement of the roles to each other can be particularly space-saving in a drop-shaped housing accommodate.

Another particularly advantageous embodiment of the invention Device is given in that the deduction of Carrier strip from one between the delivery spool and the take-up spool lying area and that the inflow of the carrier strip to the take-up roll in one with respect to the axis of the Pick-up coil a take-off area of the delivery coil diametrically opposite area. It is more advantageous Way dimensioned the counter wheel so that this has a diameter which is larger than the strip core diameter of the discharge roller. To provide one to guide you with the order material provided carrier strip suitable side surface the counter gear is advantageous in terms of its diameter dimensioned so that it is larger than an initial outer diameter the dispenser roll.

To create improved traction between the friction wheel element and the counter wheel, it is possible to profile the counter wheel. In particular in connection with one formed from an O-ring Friction wheel element, it is also possible to an outer peripheral surface of the Counter wheel, which is in contact with the friction wheel element treads, convex or concave. With a concave curved peripheral surface results in a particularly favorable stabilization of the two wheels to each other.

A particularly advantageous development of the invention Device is given in that a backstop device is provided to block the rotational movement of the take-up spool against Rotation in a direction opposite to the recording rotation Direction, with an engagement section provided in the housing, which with a mating engagement section movable relative to this can be brought into engagement. One according to the invention is particularly advantageous design of the device given that the engaging counter-section coaxially with the take-up spool is rotatably movable, and that the engaging portion and the mating counter portion substantially parallel are movable relative to each other relative to the axis of the take-up spool to step out of a position of mutual interference. A Such backstop device is particularly under manufacturing Viewpoints are particularly cheap to manufacture and also gives the device according to the invention a particularly pleasant rolling character in connection with a for this particular device typical noise.

A particularly advantageous embodiment of the mating section is given by the fact that this has a sawtooth area comprises, on a housing side surface facing End face of an axis section of the take-up coil is formed is. In a particularly advantageous manner, it is possible that Friction wheel element on this axle section provided with saw teeth to arrange. In this backstop device according to the invention is advantageously the take-up coil relative to the Housing axially movable. In such an embodiment can advantageously the inherent elasticity of the housing Device for generating a for resetting the take-up spool required contact pressure can be used.

Fig. 1

eine Ansicht einer erfindungsgemäßen Vorrichtung in einer Offenstellung zur Darstellung von Gestalt und Zuordnung der einzelnen Bauteile der Vorrichtung zueinander innerhalb des Gehäuses,

Fig. 2

eine Explosionsdarstellung derselben Vorrichtung mit einem in eine 90° Offen-Stellung geklappten Gehäuseteil,

Fig. 3

einen Axial-Halbschnitt der Aufnahmespule.

Further features of the invention result from the following description of an exemplary embodiment in conjunction with the drawing. Show it:

Fig. 1

1 shows a view of a device according to the invention in an open position to show the shape and assignment of the individual components of the device to one another within the housing,

Fig. 2

2 shows an exploded view of the same device with a housing part folded into a 90 ° open position,

Fig. 3

an axial half-section of the take-up spool.

1 is the interior of a housing 1 of the invention Device radially spaced from each other a dispensing spool 2 and a take-up spool 3 rotatably supported on journals 4 and 5. On the delivery spool 2 is via a band core 6a with an order material provided carrier strip 7 stored in roll form. The carrier strip 7 is via a deflection device 8 led to a lip 10 articulated on a ball holder 9. The carrier strip 7 is in the transport direction 11 of the lip subsequently to a tape core arranged on the take-up reel 3 6a led. The band core 6a is over a driving projection 6b drive connected to the take-up spool 3. The lead in transportation 6b is under the action of tensile stress in the carrier strip 7 in contact with a driving section formed on the take-up spool 3 held. The driving projection 6b is in several Driving sections on the take-up spool 3 can be used. Through the 1 shown formation of the band core 6a and the Recording of the tape core 6a provided axis section of the take-up spool 3 becomes a particularly simple placement of the tape core 6a possible on the take-up spool 3. The same band core geometry also applies to the delivery spool 2 side. Here too a band core 6a with play in the circumferential direction via a driving projection 6b connected to an axle portion of the delivery spool 2. The carrier strip 7 provided with order material is due the layer thickness of the application material first on a tape roll 13 stocked relatively large diameter. After removal of the Order material is the corresponding carrier strip length a role with ultimately smaller diameter added. There the diameter of the tape roll 13 for storing the carrier strip 7 together with the order material with consumption of the order material decreases more than the diameter of one on the take-up reel 3 forming take-up roll increases, it is possible, the two coils 2 and 3 so closely adjacent to each other to arrange that only a small amount between the two roles Space remains.

The take-up spool 3 is driven by a friction wheel element 12, which rests on a circumferential surface section of a counter wheel 14. The counter wheel 14 is over the band core 6a and its driving projection 6b by deducting the carrier strip 7 from the corresponding one Belt roll 13 can be driven. By the counter gear 14 and that Friction wheel element 12 becomes a required minimum gear ratio generated between the delivery spool and the take-up spool. That of the diameter combination of counter gear 14 and friction wheel element 12 defined theoretical gear ratio fits automatically to the actually required gear ratio, only from the outside diameter of the resulting one or depending on consuming tape rolls, by slippage between the friction wheel element 12 and the counter wheel 14. At the in 1 is the embodiment shown in the carrier strip 7 effective tensile force slightly less than one between the friction wheel element 12 and the counter wheel 14 transmitted friction.

To prevent rotation of the take-up spool in one of the Reverse recording rotation is a backstop provided below in connection with Fig. 3 will be explained in detail. Through the backstop 15 and the friction wheel element 12 and the counter wheel 14 also the delivery spool 2 against accidental rotation as a result of Frictional force between the friction wheel element 12 and the counter wheel 14 secured. By a fine grid of the backstop device in Connection with the friction wheel element 12 and the corresponding counter wheel 14 results in a particularly uniform deduction of the carrier strip from the dispensing roll.

In Fig. 2, the device with a 90 ° around an articulation device 20 lid pivoted into an open position 16 shown. The ball holder 9 and the delivery spool 2 and Take-up spool 3 are on, projecting vertically from the housing wall, Pin sections attached. For holding the ball holder 9 in the housing 1, a pair of hollow cylindrical pins 19 is provided. These hollow cylindrical pins 19 only partially protrude accordingly bores provided in pairs into the ball holder 9. Protrude into the remaining bore sections in the ball holder 9 when the housing 1 is in the closed position, a pair of on the cover 16 trained hollow cylinder sections into it. The axle journals 4 and 5 for holding the delivery spool 2 and take-up spool 3 comprise four Spring claw elements, which in a latching manner the corresponding secure on these mounted coils in the axial direction. The axle journals 4 and 5 define cylindrical interiors into which one Pair of ring pin sections attached to the cover 16 can be used are and the travel of the spring claw elements of the journal Limit 4 and 5.

3, the take-up spool 3 comprises a tensioning wheel 19 and one formed end face on an axis portion of the take-up spool Gear section with sawtooth geometry. This gear section is with respect to the axial direction of the delivery spool without undercuts. The toothed section 20 is for engagement with a corresponding housing-side, toothing section 18 extending in an annular manner (see also Fig. 1) provided. An application of the gear sections required spring restoring force is preferred through the outer surface of the housing and / or through the inherent elasticity the delivery coil and the journal 5 applied.

According to a particular aspect of the present invention, a Cap element provided which surrounds the application lip the device is attachable. This is advantageous the housing is tapered like a step and the cap element attachable to at least part of the tapered section. The cap element is held in an advantageous manner through frictional power transmission. As a holding surface are preferred the corresponding sections of the housing, which are vertical run to the coil axes, used.

According to a further aspect of the present invention, between the cap element and the housing a snap connection device intended. That between the housing halves in an advantageous manner The hinge provided is on one opposite the lip Housing side trained. One between the case halves effective closure device preferably comprises one from the outside by pressing the housing into a release position bringable connection device.

The tensioning wheel 19 is particularly easy to use provided with a knurling 21. The intercept of the take-up spool 3 is chamfered in an area facing away from the tensioning wheel 19, whereby a particularly simple placement of the band core 6a if necessary possible with the same slightly elastic expansion becomes. By providing the chamfer on the for receiving of the band core 6a provided axis section, it becomes possible, too to compensate for larger deviations in tolerances caused by production. Both elements 2, 6a and 14 as well as the elements 3a and 6a can advantageously be made in one piece be.

The device described above can for example in the be described in more detail below. For clarification the use of the device is intended as follows be assumed that the device is assembled in a functional manner, but not yet with one with order material Carrier strip is equipped. To equip the device with a carrier strip opens the housing of the device.

The lid of the housing is released after loosening a locking device on the housing via a hinge in an open position pivoted. Then a tape roll is made of carrier strips and order material placed on the delivery spool. In connection attached to it with an initial portion of the carrier strip connected further tape core placed on the take-up reel. One remaining between the delivery spool and the take-up spool Carrier strip section is via a deflection device and guided the application device. Subsequently, by manual actuation of the tensioning wheel of the carrier strips tensioned. It is advantageous in the device according to the invention Way possible to stop the counter wheel so that it is possible a very small carrier strip section for tensioning of the carrier strip on the take-up spool. After cocking of the carrier strip through the tensioning wheel becomes the cover of the housing swiveled into the closed position and locked by exercising low side pressure on the housing in a closed position. The device is now ready for use. On behalf of Order material on a surface becomes one from a front Mouth area of the housing excellent application lip against a Pad pressed and pulled parallel to the surface. As a result of one between the pad and the one pressed onto the pad Band section transmitted force is due to the peeling movement the carrier strip provided with the order material deducted from the dispensing roll and continuously over the Order lip led. The application material separates at the application lip from the carrier strip and remains on the base. The carrier strip freed from the order material becomes wound on the tape core arranged on the take-up reel. The take-up spool is always like this via the friction wheel element driven that even tension in the carrier strip is maintained. After the carrier strip has been completely removed the supply of order material is exhausted from the delivery spool and is a new roll with carrier strips and order material insert into the device. For this purpose, as described above, the housing is opened and the one on the delivery spool Strip core pulled from this. In the same way the carrier strip roll now created on the take-up spool removed from the take-up spool along with its tape core. In connection this process is described in the same manner as above a new spool and a corresponding tape core in the Device inserted and the housing closed again.

The invention is not based on the embodiment described above limited, for example, the carrier strip can also be connected to the take-up reel without a tape core. It is also possible, the backstop device described above without the described rotary motion transmission mechanism according to the invention to use or instead of this particularly advantageous Mechanism, for example, one that engages the tensioning wheel To provide intervention device.

All from the description and drawings, including the constructive details, emerging features be essential to the invention in any combination.

Claims (29)

1. A device for dispensing onto a surface a transfer material, in particular an adhesive transfer material, provided on a carrier strip, comprising a supply reel (2) which is rotatably accommodated in a housing (1) and which is used for storing thereon the carrier strip (7) together with the transfer material, a take-up reel (3) which is also rotatably accommodated in said housing such that it is radially displaced relative to said supply reel (2) and which is used for receiving thereon the carrier strip (7) from which the transfer material has been removed at least partially, a rotary drive transmitting mechanism used for rotatively driving the take-up reel (3) when the supply reel (2) rotates in an unwinding movement and including a clutch means for providing a driving transmission ratio of the rotary drive transmitting mechanism which is adapted to the respective unwinding/winding-up condition of the reels, and a return stop device used for blocking the rotational movement of the take-up reel in a direction opposite to the direction of the rotational take-up movement, characterized in that the return stop device comprises an engagement section (18) which is provided in the housing (1) and which is adapted to be brought into engagement with a countersection (20) that is adapted to be moved relative thereto, said countersection including a sawtooth section formed on an end face of a shaft section of the take-up reel (3) which faces a lateral surface of the housing.
2. A device according to claim 1, characterized in that the countersection (20) and the take-up reel (3) are adapted to be rotated about the same axis, and that the engagement section and the countersection (20) are adapted to be moved relative to one another essentially parallel to the axis of the take-up reel so as to move away from a position of mutual engagement.
3. A device according to claim 1 or 2, characterized in that the take-up reel (3) is adapted to be axially moved relative to said housing (1).
4. A device according to claim 1, characterized in that the clutch means comprises a friction wheel element (12) which yields in the radial direction and which is arranged co-axially with an axis of the pair of reels, said friction wheel element (12) abutting via a peripheral surface thereof on a peripheral surface section of a counterwheel element (14) so as to provide a friction force-transmitting area of contact.
5. A device according to claim 4, characterized in that the friction wheel element (12) is attached to the shaft section provided with a sawtooth profile.
6. A device according to claim 1, characterized in that said counterwheel element (14) is arranged coaxially with the supply reel (2).
7. A device according to at least one of the claims 1 to 6, characterized in that the external diameter of the friction wheel element (12) corresponds essentially to the diameter of a tape core provided for receiving thereon the carrier strip (7).
8. A device according to at least one of the claims 1 to 7, characterized in that the external radius of the friction wheel element (12) is smaller than the radius of curvature of the surface section of the counterwheel element (14) abutting on the friction wheel element (12).
9. A device according to at least one of the claims 1 to 8, characterized in that the friction wheel element (12) is a rectangular torus.
10. A device according to at least one of the claims 1 to 9, characterized in that, when seen in the axial direction, the rectangular torus has a cross-sectional width which is smaller than a radially extending cross-sectional height.
11. A device according to at least one of the claims 1 to 10 characterized in that the cross-sectional height corresponds substantially to half the internal diameter of the friction wheel element (12).
12. A device according to at least one of the claims 1 to 11, characterized in that, undergoing elastic expansion, the friction wheel element (12) is attached to a shaft section, in particular to a shaft section of the take-up reel (3).
13. A device according to at least one of the claims 1 to 12, characterized in that the friction wheel element (12) has an internal diameter which is larger than an external diameter of a shaft section provided for receiving thereon said friction wheel element (12).
14. A device according to at least one of the claims 1 to 13, characterized in that the friction wheel element (12) is an 0-ring.
15. A device according to at least one of the claims 1 to 14, characterized in that the friction wheel element (12) is produced from an elastic material having a high coefficient of surface friction, especially from a rubber material.
16. A device according to at least one of the claims 1 to 15, characterized in that the friction wheel element (12) is produced from a foamed material.
17. A device according to at least one of the claims 1 to 16, characterized in that the take-up reel (3) comprises a shaft section for receiving thereon the friction wheel element (12) and a shaft section for receiving thereon a tape core (6a).
18. A device according to at least one of the claims 1 to 17, characterized in that a manually operable tensioning wheel (19) is provided between the two shaft sections.
19. A device according to at least one of the claims 1 to 18, characterized in that the supply reel (2) includes the counterwheel element (14) and a shaft section for receiving thereon a tape core (6a).
20. A device according to at least one of the claims 1 to 19, characterized in that an area of contact between the friction wheel element (12) and the counterwheel element (14) is covered by said tensioning wheel (19).
21. A device according to at least one of the claims 1 to 20, characterized in that the shaft of the take-up reel (3) is arranged in a housing area located adjacent an applicator device (9, 10).
22. A device according to at least one of the claims 1 to 21, characterized in that the distance between the shaft of the supply-reel (2) and the applicator device (9, 10) is larger than the distance between the shaft of the take-up reel (3) and said applicator device (9, 10).
23. A device according to at least one of the claims 1 to 22, characterized in that the carrier strip (7) is unwound from the supply reel (2) in an area located between said supply-reel (2) and said take-up reel (3), and that the carrier strip (7) is supplied to the take-up reel (3) in an area which is located diametrically opposite an unwinding area of the supply reel (2) relative to the shaft of the take-up reel (3).
24. A device according to at least one of the claims 1 to 23, characterized in that the counterwheel element (14) has a diameter which is larger than the tape core diameter of the supply-reel (2).
25. A device according to at least one of the claims 1 to 24, characterized in that the counterwheel element (14) has a diameter which is larger than an external diameter of the supply tape roll (13).
26. A device according to at least one of the claims 1 to 25, characterized in that the counterwheel element (14) has a profile.
27. A device according to at least one of the claims 1 to 26, characterized in that the counterwheel element (14) has a convex or a concave outer surface.
28. A device according to claim 27 characterized in that said friction wheel element (12) is fitted onto said shaft section provided with a sawtooth profile.
29. A device according to at least one of the claims 1 to 28 characterized in that, said take-up reel (3) is axially moved relative to said housing (1).

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