# Patent

## Title
Apparatus for dispensing flowable substances

## Abstract

An apparatus for dispensing flowable substances, having a nozzle having an exit opening for dispensing the substances from the nozzle in the region of a free nozzle end, and a closure part that can be moved by means of a control element, disposed outside of the nozzle. The closure part releases the exit opening in an open position and closes the exit opening in a closed position. The control element has a frame, a transfer medium that brings about shape fit and has wheels, the transfer medium generates angle synchronicity of wheels mounted in the frame so as to pivot, a drive for the transfer medium, for pivoting the respective wheel in two opposite pivot directions, a bearing element for the closure part, mounted in wheels so as to pivot. The bearing element is mounted about pivot axles in the wheels, so as to pivot. The pivot axles are disposed in the frame parallel to the pivot axles of these wheels. The closure part is mounted in the bearing element.

## Background
FIELD
The invention relates to an apparatus for dispensing flowable substances, particularly adhesives, paints, varnishes, and release agents.
BACKGROUND
Apparatus for dispensing flowable substances, particularly adhesives, paints, varnishes, and release agents are used, for example, in order to apply adhesives to a substrate, portion by portion. In this connection, application of the adhesives takes place controlled by way of a metering valve, where application as a line, point, spray, spiral, or surface area is particularly possible.
In the processing of flowable substances with metering valves, it is problematic that residues of the substance can accumulate at the outlet of the metering valve, and, particularly if they harden there, can disrupt subsequent operation of the apparatus or can actually bring it to a complete stop.
To avoid such difficulties, an apparatus is proposed in DE 41 13 445 A1.
In this apparatus, the control element has a slide, the end of which is configured so that it can be slid over an exit opening of the nozzle and closes or opens the latter directly. The slide is an elongated metal plate that is rectangular in cross-section and is disposed in a slide housing in which there is a return spring that holds the slide in the closed position. In this connection, a closure piece situated in a recess on the closure-side end of the slide, which consists of a silicone sponge saturated in oil or anti-adhesion agent, or of a wedge-shaped plastic part inclined toward the exit opening of the nozzle forms the actual closure. The slide housing is firmly connected with a support arm, on which an accommodation holder for a metering valve that has the nozzle is also attached. Furthermore, a compressed air connector is situated on the support arm, and when this is actuated, the slide is pushed into the open position and, in this connection, the opening in the slide gets under the exit opening, thereby making it possible for the substances to be applied to the substrate. When the closure piece is moved into its closed position, a leading edge of the closure piece first makes contact with the free nozzle, before the closure piece contacts the free nozzle end over the full area with its surface facing the nozzle end and closes off the exit opening of the nozzle. This action of the free nozzle end on the leading edge during every closing procedure of the closure part leads to increased wear of the leading edge and thereby to a reduced useful lifetime of the apparatus. Aside from this, the control element used in the apparatus requires a relatively large construction space. This is particularly disadvantageous if multiple apparatuses, i.e. multiple nozzles must be disposed relatively closely next to one another, side by side, and therefore little room is available in this direction of placement of apparatuses.
An apparatus for dispensing flowable substances is furthermore described in DE 199 36 670 C1. This apparatus has a fixed support, a metering valve connected with this support, having an exit nozzle for the flowable substances, as well as an outer closure part for closing the exit opening of the nozzle. In this connection, the closure part is disposed in stationary manner and the metering valve or the nozzle is pivoted relative to the closure part. In this embodiment, as well, a leading edge of the closure part contacts the nozzle in the region of the free nozzle end during the closing procedure, in each instance, resulting in the disadvantage described, that of increased wear of the closure part in the region of the leading edge. This apparatus, too, does not have a compact construction, because of the pivoting arrangement of the metering valve.
An apparatus for dispensing flowable substances, having a nozzle and a closure part for the nozzle, is furthermore known from EP 0 719 592 A2. In this apparatus, as well, a leading edge of the closure part contacts the nozzle in the region of its free nozzle end when the closure part is moved into its closed position.
SUMMARY
It is the object of the present invention to further develop an apparatus for dispensing flowable substances, which has a nozzle that has an exit opening for dispensing the substances from the nozzle in the region of a free nozzle end, and a closure part that can be moved by means of a control element, disposed outside of the nozzle, which part releases the exit opening in an open position and closes the exit opening in a closed position, in such a manner that the closure part can be moved from the open position to the closed position in a non-linear movement, with a compact design of the control means in the direction perpendicular to the movement direction of the closure part.
This object is accomplished by means of an apparatus in which it is provided, according to the invention, that the control element has a frame, a transfer medium that brings about shape fit and has wheels, which medium generates angle synchronicity of wheels mounted in the frame so as to pivot, a drive for the transfer medium, for pivoting the respective wheel in a pivot direction and in a pivot direction opposite to that direction, a bearing element for the closure part, mounted in wheels so as to pivot, wherein the bearing element is mounted about pivot axles in these wheels, so as to pivot, wherein these pivot axles are disposed in the frame parallel to the pivot axles of these wheels, wherein the closure part is mounted in the bearing element.
The movement of the closure part from the open position to the closed position and from the closed position to the open position is thereby brought about by means of the transfer medium. This medium requires only little construction space in the direction perpendicular to the movement direction of the closure part, because it has a compact structure in this direction. This makes it possible to dispose multiple apparatuses, accordingly multiple metering units having nozzles, relatively closely next to one another, side by side. The transfer medium is a robust drive that permanently acts reliably, for moving the closure part. By means of wheels of the transfer element, the bearing element is mounted in these wheels so as to pivot in defined manner, thereby guaranteeing precise guidance of the bearing element. This ensures precise displacement of the closure part between the open position and the closed position.
The mounting of the bearing element in the wheels brings about the result that the bearing element and thereby the closure part mounted in the bearing element perform a non-linear movement when the drive is activated. The bearing axles of the bearing elements in the wheels move on a circular track, corresponding to the pivot movements of the wheels, and thereby the closure part also moves on a circular track. This fundamentally makes it possible to position the closure part relative to the nozzle in such a manner that a leading edge of the closure part does not make contact with the nozzle, but rather is moved past the nozzle, so that the closure part makes full-area contact with the exit opening of the nozzle only behind the leading edge.
The apparatus according to the invention allows simple movement of the closure part from the open position to the closed position and vice versa. This movement is caused by means of driving the transfer medium in opposite directions, thereby moving wheels for moving the closure part from the open position to the closed position in one pivot direction, and in the opposite pivot direction for moving from the closed position to the open position.
According to a particular embodiment of the invention, it is provided that the drive has an actuator that acts in linear manner and a spring. By means of the actuator, the transfer medium can be applied in one running direction, and by means of the spring, the transfer medium can be reset in the opposite running direction. In particular, it is provided that the closure part can be adjusted to its open position by means of the actuator and to its closed position by means of the spring. The actuator is configured as a pneumatically acting cylinder, for example.
The drive for the transfer medium is preferably mounted in the frame. In this connection, the drive particularly has a connecting element that can be moved back and forth and is connected with the transfer medium. The drive works together with this connecting element. For example, the pneumatically active cylinder, when air is applied to it, acts on the connecting element in the sense that it is moved in the one running direction. If the pneumatic cylinder is not under pressure, the spring acts directly, particularly on the cylinder, so that the cylinder is reset and the connecting element is moved back to the starting position when this happens.
Preferably, the connecting element is connected with a straight section of the transfer medium and can be moved in a straight line in opposite directions. The connecting element thereby engages on the transfer medium in that region in which the section of the transfer medium assigned to the connecting element is configured in a straight line.
The drive for the transfer medium can also be structured as a pivot drive, for example, which drive particularly drives one of the wheels of the transfer medium directly.
The apparatus is configured in particularly compact manner if the frame has two plate-shaped frame sections disposed parallel to one another, between which the transfer medium is disposed. The two frame sections serve for mounting the transfer medium and can accordingly be configured with a relatively small wall thickness. In this way, a particularly compact structure of the frame occurs in the region of the frame sections, in the expanse direction of the axles of the wheels of the transfer medium.
The transfer medium particularly has a belt drive, or a rod that connects the wheels and is mounted in the wheels so as to pivot, or a set of gears. For example, in the case of the belt drive, a belt, particularly a toothed belt, steel strip, chain or the like loops around the wheels of the belt drive. Alternatively, the transfer medium has two wheels that are connected by means of the rod as a component of the transfer medium or that mesh with a common gear rack that forms an integral part of the transfer medium, or, in the case of the configuration as a set of gears, three wheels that mesh with one another and form the transfer medium, of which the first and the third wheel have the same pivot direction and in which the bearing element is mounted.
By means of this embodiment, a clear kinematic relationship between the wheels that accommodate the bearing element is guaranteed.
Under the aspect of particularly advantageous contact of the closure part with the exit opening of the nozzle, it is viewed as being particularly advantageous if, with reference to a straight line that connects the pivot axles of wheels in the frame, the pivot axles of the bearing element in the wheels are disposed in such a manner that the pivot axles of the bearing element are disposed on one side of the straight line in the open position and on the other side of the straight line in the closed position. The consequence is that the bearing element and thereby the closure part connected with the bearing element can be moved from an over-dead-center location that correlates with the open position of the closure part to a dead-center location and, beyond this, to an over-dead-center location that correlates with the closed position of the closure part. This allows closing of the exit opening of the nozzle in kinematically simple manner, with directly, full-area contact of the closure part with the exit opening, thereby without initially contacting the nozzle in the region of the leading edge of the closure part.
In particular, the arrangement of the mounting of the bearing element in the wheels is selected in such a manner that in the closed position, a straight connecting line between the pivot axle of the respective wheel and the pivot axle of the bearing element in this wheel encloses an angle with the straight line that connects the pivot axle of the wheels of 5 to 25°, preferably 10 to 20°, particularly 15°. Accordingly, the bearing element and thereby the closure part are pivoted over an angle of 5 to 25°, preferably 10 to 20°, particularly 15° beyond the dead-center point, into the over-dead-center location.
It is viewed as being preferred if the respective wheel can be pivoted by an angle of 50 to 70°, preferably 55 to 65°, particularly 61°, by means of the drive. This angle therefore corresponds to the angle from the open position to the closed position of the closure part, or from the closed position to the open position of the closure part.
Under the aspect of a compact configuration of the control element in the direction perpendicular to the movement direction of the closure part, it is viewed as being particularly advantageous if the bearing element has two plate-shaped bearing element sections and connecting elements that connect these. In this connection, the bearing element sections are disposed parallel to the frame sections. This plate-shaped configuration of the bearing element sections guarantees an expanse of these bearing elements that is only relatively slight in the direction perpendicular to the movement direction of the closure part.
It is viewed as being particularly advantageous, in this connection, if the frame sections are disposed between the bearing element sections. The frame is therefore disposed essentially within the bearing element.
With regard to the configuration of the closure part, it is viewed as being particularly advantageous if the closure part has a bearing section that is connected with the bearing element in the region of one end, and a closure part section for contacting the exit opening, as well as a connecting arm that connects the bearing section and the closure part section, in the region of an opposite end. In this connection, it is viewed as being particularly advantageous if the closure part has a spring property. This property makes it possible to press the closure part against the nozzle at a certain bias after contact with the exit opening of the nozzle, and thereby to allow secure closure of the exit opening.
Fundamentally, it is possible that the closure part is configured in one piece, and thereby, in particular, does not have different material properties in the region of a closure part surface that faces the nozzle ending in the closed position and closes the exit opening and the remaining region of the closure part, particularly a bearing region of the closure part. In this case, the closure part preferably consists of metal or plastic.
It is viewed as being preferable if a closure part section of the closure part has a base element and a plate accommodated by the base element, where the plate has the closure part surface, which serves for closing the exit opening of the nozzle, on its side facing away from the base element. The base element represents the support element for the plate, which has a different material property from that of the base element. Preferably, the plate is elastically deformable, and particularly has rubber-elastic properties.
The closure part is particularly configured in plate shape and has an expanse in the axle direction of the wheels that is less than the expanse of the bearing element in this direction. This configuration of the closure part therefore also contributes to a compact configuration of the control element in the direction perpendicular to the movement direction of the closure part.
It is considered to be particularly preferred, under the aspect of the movement of the closure part from the open position of the closure part to its closed position, if the closure part surface is disposed next to the nozzle and at a level upstream from the exit opening, with reference to the flow direction of the substances through the nozzle, in the open position, and can be moved from the open position to the closed position, by means of the control element, in such a manner that the leading edge of the closure part surface is moved past the free nozzle end. The nozzle is preferably configured to narrow in the direction of the nozzle end.
Accordingly, the closure part does not contact the nozzle in the region of its free nozzle end with the leading edge first when the closure part is moved from the open position to the closed position, but rather, the leading edge is guided past the nozzle end, thereby causing the closure part to come into initial contact with the nozzle behind the leading edge. In this way, damage to the leading edge when the closure part is moved from the open position to the closed position is excluded. It is particularly advantageous if the closure part contacts the free nozzle end over as large an area as possible when it makes contact with the nozzle, thereby causing closure of the exit opening of the nozzle to take place directly. The exit opening of the nozzle is cleaned by means of the movement of the closure part.
The movement of the closure part relative to the nozzle, in the region of the exit opening, is preferably selected in such a manner that the closure part is moved with a movement component perpendicular to the flow direction of the substances through this nozzle, with reference to the exit opening. Consequently, this movement brings about the result, at a high degree of effectiveness, that the closure part almost completely entrains substance residues that have accumulated in the region of the exit opening of the nozzle, toward the side, and thereby frees the nozzle of substance residues in the region of the exit opening.
Preferably, the closure part surface, when the closure part is moved from the open position to the closed position and vice versa, is disposed perpendicular to the straight line that connects the wheels and parallel to the pivot axles of the wheels. Accordingly, the closure part surface is moved parallel from the open position to the closed position and vice versa. In particular, it is provided that the closure part is disposed perpendicular to the exit axis of the nozzle. The closure part surface is level, for example.
Preferably, the application apparatus that has the nozzle is provided with an integrated guide shoe, which guides a substrate that moves underneath the nozzle. In this connection, a narrow and thin configuration of the closure part allows a small distance between the exit opening of the nozzle and the substrate, for example a distance of maximally 5 mm, particularly 3 mm. Furthermore, the kinematics of the closure part make it possible for the nozzle to remain in its metering position while the closure part is being moved into its closed position.
Further characteristics of the invention are represented in the dependent claims, the description of the drawing of the figures, and the figures themselves, in which connection it is noted that all the individual characteristics and all the combinations of individual characteristics are essential to the invention.



BRIEF DESCRIPTION OF THE DRAWINGS
In the figures, the invention is represented using preferred exemplary embodiments, without being restricted to these.
FIG. 1 shows for a first exemplary embodiment, a side view of the apparatus according to the invention, where a housing of a metering valve having a nozzle is also illustrated with broken lines (in a view I according to FIG. 2), where a closure part of the apparatus is illustrated in an open position.
FIG. 2 shows a view of the apparatus according to arrow II in FIG. 1.
FIG. 3 shows a view of the apparatus according to arrow III in FIG. 1.
FIG. 4 shows the apparatus in a sectional representation according to the line IV-IV in FIG. 3.
FIG. 5 shows the apparatus in a representation according to FIG. 1, thus illustrated without the housing of the metering valve, but illustrated for the closure part situated in the closed position.
FIG. 6 shows the apparatus according to FIG. 5 in a sectional representation according to FIG. 4.
FIGS. 7, 8, 9, and 10 show the apparatus, thus shown without the housing of the metering valve, with the closure part situated in the open position, illustrated in different spatial views.
FIG. 11 shows a detailed representation of the closure part in the region of its end that serves for closing the exit opening of the nozzle of the metering valve, illustrated in an enlarged representation for the open position and the closed position of the closure part, with reference to the end of the nozzle facing the closure part.
FIG. 12 shows a side view of the arrangement according to FIG. 1, with a guide shoe additionally illustrated.
FIG. 13 shows the arrangement according to FIG. 12 in a view according to arrow 13 in FIG. 12.
FIG. 14 shows, for a second exemplary embodiment, the apparatus, thus shown without the housing of the metering valve, with the closure part situated in the open position, illustrated in a spatial view according to the representation of FIG. 7 relating to the first exemplary embodiment.
FIG. 15 show a sectional representation of the apparatus according to FIG. 14, illustrated for the closure part of the apparatus situated in the open position.
FIG. 16 shows a sectional representation of the apparatus according to FIG. 14, illustrated for the closure part of the apparatus situated in the closed position.
FIG. 17 shows, for a third exemplary embodiment, the apparatus, thus shown without the housing of the metering valve, with the closure part situated in the open position, illustrated in a spatial view according to the representation of FIG. 7 relating to the first exemplary embodiment.
FIG. 18 shows a sectional representation of the apparatus according to FIG. 17, illustrated for the closure part of the apparatus situated in the open position.
FIG. 19 shows a sectional representation of the apparatus according to FIG. 17, illustrated for the closure part of the apparatus situated in the closed position.



DETAILED DESCRIPTION
The apparatus according to the invention, which is shown with regard to the first exemplary embodiment in FIGS. 1 to 13, serves for dispensing flowable substances, particularly adhesives, paints, varnishes, and release agents, for the purpose of application to a substrate. In this connection, dispensing of the flowable substances takes place controlled by way of a metering valve, which is illustrated in FIG. 1, only with regard to its housing 1, in greatly simplified manner by means of the broken line, and by way of the nozzle 2 mounted in the housing 1. In the other figures, the housing 1 is not shown; rather, only the nozzle 2 is shown.
Different types of application to a substrate are possible by way of the metering valve, for example application as a line, dot, spray, spiral or surface area.
In the region of its free nozzle end 3, the nozzle has an exit opening 4 for dispensing the substances from the nozzle 2. A closure part 5 is disposed outside of the nozzle 2, which part can be moved by means of a control element 6. In its open position, which is illustrated in FIGS. 1 to 4 and 7 to 10, the closure part 5 releases the exit opening 4, and closes the exit opening 4 in the closed position illustrated in FIGS. 5 and 6.
The control element 6 has a frame 7. This frame 7 is screwed onto the housing 1 by means of screws 8. The housing 1 is stationary. The frame 7 has a housing 10 of an actuator 11 configured as a pneumatic cylinder, and, on the side facing away from the housing 1, two plate-shaped frame sections 12 disposed parallel to one another. The actuator 11 has a connector 13 for supplying compressed air, and a cylinder space 14 assigned in the housing 10, for displaceable accommodation of a piston 15. The piston 15 can be displaced under the effect of compressed air, counter to the force of a spring 16.
The frame sections 12 are screwed onto tabs 39 affixed to the housing 10, in the region of the ends of the housing 10, to which the connector 13 and the spring 16 are assigned.
A transfer medium 17 is mounted in the frame 7, in concrete terms in the two frame sections 12, which medium is configured as a belt drive. This drive has two wheels 18, 19 configured as gear wheels, and a belt 20 that loops around them, which is configured as a toothed belt. The two wheels 18 and 19 are configured identically, and a straight line 22 connects the bearing axles 21 of the wheels 18 and 19, which line is disposed parallel to the stroke direction of the piston 15. Accordingly, belt sections 23 run parallel to the straight line 22 and to the longitudinal axis of the piston 15 between the two wheels 18, 19.
A connecting element 24 is connected with the piston 15, which element is disposed radially and passes through an oblong hole 25 in the housing 10, where the end of the connecting element 24 that exits from the housing 10 is firmly connected with the belt 20 in the region of the one belt section 23 that faces the housing 10. Accordingly, a stroke movement of the piston 15, under the effect of compressed air, leads to movement of the belt 20 by a corresponding distance, counterclockwise, and the reset movement of the piston, without the effect of compressed air and under the effect of the spring 16, leads to a reset movement of the belt 20 by the corresponding stroke distance of the piston 15. Therefore the wheels 18 and 19 are pivoted in a pivot direction and in an opposite pivot direction, about the same respective pivot angle, by means of the pneumatic drive and the spring, respectively.
A bearing element 26 for the closure part 5 is mounted in the two wheels 18, 19 at a distance from the pivot axles of the wheels 18, 19, so as to pivot. In this connection, the bearing element 26 is mounted so as to pivot about axles 27 of the wheels 18, 19, which are disposed parallel to the pivot axles 21 of the wheels 18, 19. The bearing element 26 has two plate-shaped bearing element sections 28 and connecting elements 29 that connect these sections. The bearing sections 28 are disposed parallel to the frame sections 12; furthermore, the frame sections 12 are disposed between the bearing element sections 28. The two frame sections 12 accommodate the transfer medium 17 and the wheels 18, 19, respectively, with slight axial play, and the respective bearing element section 28 is disposed at a slight distance from the assigned frame section 12. This can particularly be seen in the representation of FIG. 2, which illustrates that the control element 6 is structured in very compact manner in the direction of the bearing axles 21.
In the region of one end, the closure part 5 has a bearing section 30 that is connected with the bearing element 26 in the region of the connecting elements 29 adjacent to the wheel 19. In the region of the opposite end, the closure part 5 has a closure part section 31 for contacting the exit opening 4. Furthermore, the closure part 5 has a connecting arm 32 that connects a bearing section 30 and the closure part section 31. The closure part 5 is configured in plate shape and has an expanse in the axle direction of the wheels, i.e. in the expanse of the bearing axles 21, which is less than the expanse of the bearing element 26 in this direction.
When comparing FIGS. 1 and 5 or 4 and 6 and the detail representation according to FIG. 11, it can be seen that the closure part surface 33, i.e. that surface of the closure part section 31 that serves for closing the exit opening 4 of the nozzle 2 in the closed position of the closure part 5, is disposed next to the nozzle 2 and at a level upstream from the exit opening 4, with reference to the flow direction of the substances through the nozzle 2, in the open position. Furthermore, it can be seen that the closure part 5 can be moved from the open position to the closed position by means of the control element 6, in such a manner that a leading edge 34 of the closure part surface 33 is moved past the conically narrowing free nozzle end 3. In this connection, in the closed position of the closure part 5, a straight connecting line between the pivot axle of the respective wheel and the pivot axle of the bearing element in this wheel, illustrated for the one wheel 18 by the straight connecting line 35, encloses an angle with the straight line 22 that connects the pivot axles 21 of the wheels 18, 19 of 5 to 25°, preferably 10 to 20°, particularly 15°. This angle α is illustrated in FIG. 11 for the region of the nozzle 2, where the angle α is clearly represented on a larger scale there, for a better illustration. In total, the respective wheel 18, 19 can be pivoted by an angle of 50 to 70°, preferably 55 to 65°, particularly 61°, by means of the drive. This pivot angle β is illustrated in FIG. 11, once again for the region of the nozzle 2.
The closure part section 31 has a base element 36 and a plate 37 accommodated by the base element 36. The plate 37 has the closure part surface 33 on its side facing away from the base element 36. The plate 37 is elastically deformable; in particular, it has rubber-elastic properties. The base element 36, the connecting arm 32, and the bearing section 30 consist of metal and have a spring property.
The closure part surface 33 is level. When the closure part 5 is moved from the open position to the closed position and vice versa, the closure part surface 33 is disposed perpendicular to the straight line 22 that connects the wheels and parallel to the pivot axles 21 of the wheels 18, 19. Accordingly, the closure part surface is moved parallel when it is moved from the open position to the closed position and vice versa. In this connection, the closure part surface 33 is disposed perpendicular to the exit axis 9 of the exit opening 4 of the nozzle 2.
The leading edge 34 of the closure part surface 33 coincides with a leading edge 38 of the base element 36.
As can be seen in the representation of FIGS. 1 and 4, the closure part 5, in the open position, is situated next to the narrowing, particularly conically narrowing nozzle end 3, in the region of its closure part surface 33. Because of the kinematics of the control element 6, the closure part 5, proceeding from this open position, is moved in such a manner that the leading edge 34 is moved past the free nozzle end. Therefore the plate 37 comes to lie against the nozzle 2, in the region of the nozzle end 3, only behind the leading edge 34. When the closure part surface 33 contacts the nozzle 2, the closure part 5 and thereby the closure part surface 33 are moved further with a movement component perpendicular to the exit axis 9 of the exit opening 4 of the nozzle 2, relative to the latter. This movement leads to the result that the plate 37 entrains substance residues that have accumulated in the region of the exit opening 4 of the nozzle 2 toward the side, and thereby frees the nozzle 2 of substance residues in the region of the exit opening 4.
The plate 37 can therefore be moved parallel, by means of the control element 6, in such a manner that the closure part surface 33 is moved in arc shape from the open position to the closed position, in concrete terms, proceeding from an over-dead-center location in the open position to a dead-center location before contacting the nozzle 2 by means of the plate 37, and from there into an over-dead-center location in the closed position of the plate 37. In this connection, the spring property of the closure part 5 ensures that the closure part surface 33, after making contact with the exit opening 4 of the nozzle, is pressed against the nozzle 2 with a certain bias, and thereby secure closure of the exit opening 4 is guaranteed. The elastically deformable configuration of the plate 37 also contributes to this.
FIGS. 12 and 13 show that the apparatus illustrated in FIGS. 1 to 11 is additionally provided with an integrated guide shoe 40, which is provided for the purpose of guiding a substrate that moves underneath the nozzle 2, in the region of the underside 41 of the guide shoe 40. In this connection, the narrow and thin configuration of the closure part 5, particularly in the region of the closure part section 31, makes a small distance possible between the exit opening of the nozzle 2 and the substrate that lies against the underside 41, for example a distance of max. 5 mm, particularly 3 mm. Furthermore, the kinematics of the closure part 5 make it possible for the nozzle 2 to remain in its metering position when the closure part is moved to its closed position. The guide shoe 40 is also configured to be rather narrow, as can particularly be seen in the representation of FIG. 13, and particularly has a constant thickness, so that an essentially plate-shaped configuration of the guide shoe 40 results.
The second exemplary embodiment according to FIGS. 14 to 16 and the third exemplary embodiment according to FIGS. 17 to 19, respectively, differ from the first exemplary embodiment as described in FIGS. 1 to 13 only by the configuration of the transfer medium 17 that generates the angle synchronicity of the wheels 18, 19 that are mounted in the frame 7 so as to pivot. In order to avoid repetition with regard to the description of the second and third exemplary embodiment, components that are the same as in the first exemplary embodiment are labeled with the same reference numbers, for the sake of simplicity.
In the second exemplary embodiment according to FIGS. 14 to 16, the two wheels 18, 19 do not have a belt 20 looped around them, but rather instead of the belt, a further wheel 42, which is also configured as a gear wheel, is disposed between the wheels 18 and 19, which are configured as gear wheels. This wheel 42, which forms an integral part of the transfer medium 17, is mounted in the frame 7, in concrete terms in the frame section 12, so as to pivot about a bearing axle 43, where this bearing axle 43 is disposed parallel to the bearing axles 21 of the wheels 18 and 19. The wheel diameter of the wheel 42 is clearly less than the diameter of the respective wheel 18, 19. The wheels 18, 19 are configured to be identical, therefore configured as identical gear wheels, thereby making it possible to synchronously drive the wheel 42 by means of the wheel 18 and to drive the wheel 19 by means of this wheel 42. This configuration of the transfer medium 17 as a set of gears thereby brings about the same synchronous movement of the wheels 18 and 19 as the configuration of the transfer medium 17 in the first exemplary embodiment, which has the belt drive. As can be clearly seen in FIG. 4, the axis of rotation of the pivot axles 21 are on two different axes.
The wheel 18 is driven by means of the actuator 11, where the connecting element 24 connected with the piston 15 is connected with a rod 44, so as to pivot, which rod is connected with the wheel 18, so as to pivot. The bearing axle 45 of connecting element 24 and rod 44, as well as the bearing axle 46 of rod 44 and wheel 18, are disposed parallel to the bearing axles 21, in each instance.
FIG. 14 and FIG. 15 show the arrangement of the actuator 11, of the connecting element 24, and of the rod 44 in the open position of the closure part 5.
FIG. 16 shows the arrangement of the actuator 11, of the connecting element 24, and of the rod 44 in the closed position of the closure part 5.
The third exemplary embodiment differs from the first exemplary embodiment in that instead of a belt 20, particularly a toothed belt that loops around the wheels 18, 19, particularly gear wheels, the two gear wheels 18, 19, which are configured to be identical, are in engagement with a rack 47 that forms an integral part of the transfer medium 17. This rack is connected with the actuator 11 by means of the connecting element 24. The rack 47 brings about synchronous rotational movement of the wheels 18, 19. The rack is moved by means of the actuator 11, in the movement direction of the piston 15.
FIGS. 17 and 18 show the rack 47 in its one end position, in which the movable closure part 5 is situated in the open position. FIG. 19 shows the rack 47 in the other end position, in which the closure part 5 is situated in its closed position.
REFERENCE SYMBOL LIST


    1 housing
    2 nozzle
    3 nozzle end
    4 exit opening
    5 closure part
    6 control element
    7 frame
    8 screw
    9 exit axis
    10 housing
    11 actuator
    12 frame section
    13 connector
    14 cylinder space
    15 piston
    16 spring
    17 transfer medium
    18 wheel
    19 wheel
    20 belt
    21 bearing axle
    22 straight line
    23 belt section
    24 connecting element
    25 oblong hole
    26 bearing element
    27 pivot axle
    28 bearing element section
    29 connecting element
    30 bearing section
    31 closure part section
    32 connecting arm
    33 closure part surface
    34 leading edge
    35 straight connecting line
    36 base element
    37 plate
    38 leading edge
    39 tab
    40 guide shoe
    41 underside
    42 wheel
    43 bearing axle
    44 rod
    45 bearing axle
    46 bearing axle
    47 rack

## Claims

1. An apparatus for dispensing flowable substances, comprising:
a nozzle (2) that has an exit opening (4) for dispensing the substances from the nozzle (2) in the region of a free nozzle end (3),
a closure part (5) to selectively open and close the exit opening (4) of the nozzle (2),
a control element (6), disposed outside of the nozzle (2), connected to the closure part (5) to release the exit opening (4) in an open position and close the exit opening (4) in a closed position,
wherein the control element (6) has:
a frame (7),
a transfer medium (17) having wheels (18, 19), said transfer medium generating angle synchronicity of the wheels (18, 19) mounted in the frame (7) so as to pivot about bearing axles (21), wherein the axis of rotation of said bearing axles are noncoaxial,
a drive (11, 16) for the transfer medium (17), to pivot the respective wheel (18, 19) in a first pivot direction and in a second pivot direction opposite to the first pivot direction,
a bearing element (26) for the closure part (5), pivotably mounted about pivot axles (27) of the wheels (18, 19), wherein the pivot axles (27) are disposed in the frame (7) parallel to the bearing axles (21) of the wheels (18, 19), and

wherein the closure part (5) is mounted in the bearing element (26).

2. The apparatus according to claim 1, wherein the drive (11, 16) has an actuator (11) that acts in linear manner and a spring (16), wherein the actuator (11) is configured to apply the transfer medium (17) in a first running direction, and the spring (17) is configured to reset the transfer medium in a second running direction opposite to the first running direction.

3. The apparatus according to claim 1, wherein the drive (11, 16) for the transfer medium (17) is mounted in the frame (7), wherein the drive has a connecting element (24) movably connected with the transfer medium (17).

4. The apparatus according to claim 2, wherein the drive (11, 16) for the transfer medium (17) is mounted in the frame (7), wherein the drive has a connecting element (24) movably connected with the transfer medium (17).

5. The apparatus according to claim 3, wherein the connecting element (24) is connected with a straight section of the transfer medium (17) and is configured to be moved in opposite directions, in a straight line.

6. The apparatus according to claim 1, wherein the frame (7) has two plate-shaped frame sections (12) disposed parallel to one another, between which the transfer medium (17) is disposed.

7. The apparatus according to claim 1, wherein the transfer medium (17) has a belt drive (17) or a rod that connects the wheels (18, 19) and is mounted in the wheels (18, 19), so as to pivot, or a rack (47) that meshes with the wheels (18, 19), or a set of gears (18, 19, 42).

8. The apparatus according to claim 6, wherein the transfer medium (17) is configured as a belt drive (17) and the wheels (18, 19) are configured as gear wheels and the belt (20) is configured as a toothed belt.

9. The apparatus according to claim 1, wherein, with reference to a straight line (22) that connects the bearing axles (21) of wheels (18, 19) in the frame (7), the pivot axles (27) of the bearing element (26) of the wheels (18, 19) are disposed on one side of the straight line (22) in the open position and on the other side of the straight line (22) in the closed position.

10. The apparatus according to claim 8, wherein in the closed position, a straight connecting line (35) between the bearing axle (21) of the respective wheel and the pivot axle of the bearing element (26) in the respective wheel encloses an angle with the straight line (22) that connects the bearing axles (21) of the wheels (18, 19) of between 5 to 25°.

11. The apparatus according to claim 8, wherein in the closed position, a straight connecting line (35) between the bearing axle (21) of the respective wheel and the pivot axle of the bearing element (26) in the respective wheel encloses an angle with the straight line (22) that connects the bearing axles (21) of the wheels (18, 19) of between 10 to 20°.

12. The apparatus according to claim 8, wherein in the closed position, a straight connecting line (35) between the bearing axle (21) of the respective wheel and the pivot axle of the bearing element (26) in the respective wheel encloses an angle with the straight line (22) that connects the bearing axles (21) of the wheels (18, 19) of 15°.

13. The apparatus according to claim 1, wherein the respective wheel is connected to pivot between an angle of 50 to 70° by the drive (11, 16).

14. The apparatus according to claim 1, wherein the respective wheel is connected to pivot between an angle of 55 to 65° by the drive (11, 16).

15. The apparatus according to claim 1, wherein the respective wheel is connected to pivot between an angle of 61° by the drive (11, 16).

16. The apparatus according to claim 5, wherein the bearing element (26) has two plate-shaped bearing element sections (28) and connecting elements (29) that connect the two plate-shaped bearing element sections (28), wherein the bearing element sections (28) are disposed parallel to the frame sections (12), and the frame sections (12) are disposed between the bearing element sections (28).

17. The apparatus according to claim 1, wherein the closure part (5) has a bearing section (30) that is connected with the bearing element (26) in the region of one end, a closure part section (31) for contacting the exit opening (4), and a connecting arm (32) that connects the bearing section (30) and the closure part section (26), in the region of an opposite end.

18. The apparatus according to claim 1, wherein the closure part (5) is configured in a plate shape and has an expanse in the axle direction of the wheels (18, 19) that is less than an expanse of the bearing element (26) in the axle direction of the wheels (18, 19).

19. The apparatus according to claim 1, further comprising a closure part surface (33) of the closure part (5) that serves for closing the exit opening (4) disposed, in the open position, next to the nozzle (2) and at a level upstream from the exit opening (4), with reference to the flow direction of the substances through the nozzle (2), and wherein the closure part (5) is configured to be moved from the open position to the closed position, by the control element (6) such that the leading edge (34) of the closure part surface (33) is moved past the free nozzle end (3) in a direction perpendicular to the flow direction of the substances.

20. The apparatus according to claim 14, wherein when the closure part (5) is moved from the open position to the closed position and vice versa, the closure part surface (33) is disposed perpendicular to the straight line (22) that connects the wheels, and parallel to the pivot axle (21) of the respective wheel (18 or 19).