Method for producing a finger joint, and finger joint press

Abstract

The invention relates to improvements in the technical field of the production of finger joints. Inter alia, a method is proposed for the production of a finger joint between two components (2, 3), in which it is proposed that at least one of two components (2, 3) to be joined is moved by means of a feed unit (6) of a finger joint press (1) to a joining position in a positioning movement and then the finger-joint profile (8) of the component (2, 3) is moved from the joining position to a target position within the finger-joint profile (8) of the other component (2, 3) and is pressed together with same. The joining movement is performed at a speed that is lower than a speed, more particularly an average speed, of the positioning movement.

Description

[0001] Method for producing a finger joint and finger joint press

[0002] The invention relates to a method for producing a wedge joint and a wedge joint press.

[0003] Finger joints are used for the longitudinal connection of components, such as wooden beams. The components are pushed together with their finger joint profiles and pressed together. Beforehand, at least one of the finger joints can be coated with an adhesive, such as glue or PU adhesive. By pressing the finger joint together, the adhesive is distributed between the profile surfaces of the two finger joints, thus ensuring a reliable connection between the components.

[0004] The creation of precise and accurately fitting connections between components, such as board, plate, or beam elements, is of enormous importance for component strength. Due to current joining technology, the connection is usually the weakest link.

[0005] The object of the invention is therefore to provide a method for producing a wedge joint and a wedge joint press, i.e. a device for producing a wedge joint, which promote the production of a particularly resilient wedge joint between two components.

[0006] To achieve the object, a method for producing a finger joint is firstly proposed which has the means and features of the independent claim directed to such a method. To achieve the object, a method for producing a finger joint between two components which have corresponding finger joint profiles is thus particularly proposed, wherein at least one of the two components is moved with its finger joint profile into a joining position by a feed unit of a finger joint press in a positioning movement and is brought closer to the finger joint profile of the other component. The finger joint profile of one component is then moved with the feed unit in a joining movement from the joining position into a target position within the other finger joint profile and is pressed together with the latter.According to the invention, it is provided that the joining movement is carried out at a speed which is lower than a speed, for example lower than an average speed, of the positioning movement.

[0007] The method according to the invention has many advantages. Firstly, it makes it possible to bring the components, which are initially held at a distance on a finger joint press, together as quickly as possible. This promotes the shortest possible process time for the automated production of a finger joint between the components. Because the joining movement is carried out at a lower speed than the positioning movement, it is ensured that the two finger joint profiles do not damage each other when the finger joint profiles are pushed together to produce the finger joint. Furthermore, the joining movement, which is carried out at a lower speed than the positioning movement, can promote an even distribution of adhesive on the flanks of the finger joint profiles of the components to be joined.The joining movement, which is carried out at a reduced speed compared to the positioning movement, promotes the even distribution of adhesive on the flanks of the finger joint profiles within a joining gap between the finger joint profiles. This promotes the formation of a high-strength finger joint between the components. Furthermore, the reduced speed of the joining movement also prevents adhesive previously applied to at least one of the finger joint profiles from being displaced from the joining gap between the finger joint profiles when the finger joint profiles of the two components to be joined are pushed together, and then no longer being available for an adhesive bond between the components.

[0008] Furthermore, the reduced speed of the joining movement prevents pressure peaks that may be many times higher than the permissible joining force that can be applied to press the finger joints together in one step of the process for producing a finger joint. In this way, the reduced speed of the joining movement prevents damage to the joint and, in extreme cases, the destruction of individual teeth or the entire finger joint of one or both components.

[0009] The speed of the joining movement can be selected so that the profile surfaces or flanks to be coated with adhesive are evenly coated as the finger joints are pushed together. The joining movement, which is carried out at a lower speed than the positioning movement, also allows a specified pressing pressure to be reliably achieved and maintained over a specified period of time. The pressing pressure for pressing the two finger joints together can be applied according to a predefined pressure curve in order to promote even displacement and distribution of adhesive within a joining gap between the two finger joints. The slower joining movement also effectively prevents gap effects and the associated damage to the finger joints of the components to be joined.

[0010] In one embodiment of the method, the finger joint profiles are already brought close enough together in the joining position to engage with each other. The components can be held relative to each other in such a way that the finger joint profiles overlap but do not yet come into contact. In this embodiment of the method, the finger joint profiles are not yet fully inserted into each other in the joining position. In the joining position, the finger joint profiles can, for example, be pushed into each other up to an insertion depth that corresponds to between one third and one half the profile depth of one of the two finger joint profiles. As soon as the components and their finger joint profiles have reached the joining position, the feed unit of the finger joint press can be controlled so that the subsequent joining movement takes place at a reduced speed compared to the previous positioning movement.

[0011] The joining position is then the position from which the joining movement is started in order to press the finger joint profiles of the components together to create the finger joint connection.

[0012] As already indicated above, at least one of the finger joint profiles can be provided with an adhesive. A PU adhesive, for example, can be used as the adhesive. PU can stand for polyurethane. Preferably, at least one of the finger joint profiles is provided with an adhesive before the finger joint profiles are pressed together. It is particularly advantageous to provide at least one of the finger joint profiles with an adhesive before the at least one finger joint profile is arranged in the joining position.

[0013] Preferably, the adhesive can be applied in the form of an adhesive bead to the tips of at least one finger joint profile. This can also preferably be done before the at least one finger joint profile reaches the joining position.

[0014] In this embodiment of the method, the adhesive is applied in the form of an adhesive bead to the finger joint profile, specifically to the tips of the finger joint profile. Due to the joining movement, which is carried out at a reduced speed compared to the positioning movement, the adhesive bead, initially still located on the tips of one of the two finger joint profiles, is slowly and precisely displaced by the finger joint profile of the other component into a joining gap or adhesive gap between the two finger joint profiles to be joined. This promotes an even distribution of the adhesive between the finger joint profiles of the components and the most complete possible wetting of the profile surfaces of the finger joint profiles to be joined with the adhesive.Furthermore, this prevents adhesive from being displaced or extruding from the joint gap, which then acts as the adhesive joint, when the finger joints are pushed together. It is also possible to apply the adhesive in a surface application to at least one of the finger joints, in particular to the flanks of at least one of the finger joints. The joining movement, performed at a reduced speed, also promotes an even distribution of the adhesive between the components.

[0015] In one embodiment of the method, an adhesive consisting of two components is used. The two components of the adhesive can be applied separately to at least one of the two finger joint profiles to be joined. A first component, preferably an adhesive component, can be applied, for example, after a first milling process, for example to produce a first finger joint profile. A second component of the adhesive, in particular a hardener component, can be applied, for example, after a second milling process, in particular to produce a second finger joint profile. The components can be applied either as a bead, as described above, or over a surface.

[0016] When the components, i.e. the adhesive component and the hardener component, are applied to the surface, the process and the joining movement, which is carried out at a reduced speed compared to the positioning movement, promote careful mixing of the two components.

[0017] After the adhesive has been applied, the finger joints can then be pressed together in a pressing step of the process. This involves building up pressure to a defined target pressure and maintaining this pressure for a defined period of time to create the finger joint.

[0018] It is advantageous if the pressing pressure is built up continuously. This promotes an even distribution of adhesive in the adhesive joint between the finger joint profiles to be joined and also helps to prevent damage to the finger joint profiles during pressing. When using a multi-component adhesive, for example a two-component adhesive, a continuous build-up of the pressing pressure promotes thorough mixing of the adhesive components. The feed unit of the previously mentioned finger joint press can be controlled accordingly with a control unit of the finger joint press to carry out the positioning movement and the joining movement and a pressing step.

[0019] The control unit is then programmed and controls the feed unit of the finger joint press so that the feed unit initially moves the at least one component with its finger joint profile from a starting position into the joining position during the positioning movement. The feed unit can then perform the joining movement at a reduced speed compared to the positioning movement and press the two finger joint profiles together. Furthermore, the control unit can control the feed unit so that the two finger joint profiles are pressed together in one pressing step of the process with a defined pressing pressure for a specific period of time.

[0020] The positioning movement into the joining position can be carried out at a decreasing speed, preferably linear. The decrease in speed can be specified as a function of position or path, so that the speed of the subsequent joining movement is reached when at least one component is in the joining position with its finger joint profile. This makes it possible to transition smoothly from the positioning movement to the joining movement without having to stop the feed unit.

[0021] The positioning movement can be a linear movement. The joining movement can be a linear movement. Furthermore, it is possible and preferred for the positioning movement and the joining movement to be carried out in the same direction. This is particularly advantageous when a linear unit, in particular a hydraulic and / or electromechanical unit, which can carry out a linear movement is used as the feed unit.

[0022] As already indicated above, the positioning movement and / or the joining movement and / or a pressing pressure can be controlled and / or specified depending on a relative position of the finger joint profiles to be joined. It is also possible for a speed of the positioning movement and / or a speed of the joining movement to be controlled and / or specified depending on a relative position of the finger joint profiles to be joined. Both can be accomplished by the previously mentioned control unit of the finger joint press.

[0023] The relative position of the two finger joint profiles can be determined using a position measuring system. The position measuring system can be a position measuring system of the finger joint press. The position measuring system can be connected to a control unit of the finger joint press, allowing path- and / or position-dependent control of the positioning movement, the joining movement, and / or the pressing pressure. The position measuring system can be configured to determine the path traveled by a component moved with the feed unit.

[0024] For example, the position measuring system can be configured to record a distance traveled by a movable clamping shoe of the finger jointing press, which is moved with the feed unit, when the process is carried out.

[0025] In a referencing step of the method, a starting position of at least the finger joint profile to be moved with the feed unit and / or a starting distance between the finger joint profiles of the two components to be joined can be determined, in particular before the positioning movement is carried out. From the starting position and / or the starting distance, a reference point for a path measurement and / or a determination of a relative position of the finger joint profiles when carrying out the method can be derived. In the referencing step, a reference point can therefore be determined as the zero point, from which the method can be carried out in the manner described above. The reference point is important in that it is from this point that the positioning movement of the at least one finger joint profile into the joining position is initially carried out.The reference point serves as a guide for the position measuring system to determine how far the feed unit must move at least one finger joint profile until it reaches the joining position. The joining position can be determined from the initial distance and / or profile depth of the finger joint profiles to be joined.

[0026] To achieve this objective, a wedge-jointing press is also proposed, which is configured to produce a wedge-jointed joint between two components and which has the means and features of the claim directed to a wedge-jointing press. According to the invention, the wedge-jointing press is configured to carry out the method for producing a wedge-jointed joint according to one of the claims directed to such a joint.

[0027] In the context of the invention, a wedge-jointing press can generally be understood as a device for producing a wedge-jointed joint.

[0028] The finger jointing press can have a control unit and / or a position measuring system, in particular a precision position measuring system, and / or at least one, preferably at least one hydraulic and / or at least one electromechanical, feed unit as means for carrying out the method.

[0029] The finger joint press can further comprise a reference point determination system. The reference point determination system can be configured to determine a starting position of a component to be moved to produce a finger joint and its finger joint profile and / or to determine an initial distance between finger joint profiles of two components to be joined together as a reference for the previously mentioned position measuring system of the finger joint press and the control of the finger joint press's feed unit.

[0030] The reference point determination system can be, for example, a laser measuring system. Using the reference point determination system,

[0031] Referencing step of the previously explained method thus determines a starting point for carrying out the positioning movement and the subsequent joining movement.

[0032] In one embodiment of the finger joint press, it has a stationary, preferably hydraulic, clamping shoe and a movable, preferably hydraulic, clamping shoe with its feed unit for clamping a respective component. Another embodiment of the finger joint press provides for two movable clamping shoes.

[0033] Using the movable clamping shoe, it is possible to first clamp a component and then move it toward a component clamped on the other clamping shoe to carry out the process. The clamping shoes can be configured for hydraulic clamping of components. In one embodiment of the finger jointing press, a clamping force that can be exerted on the components with the clamping shoes can be directed transversely or at right angles to a direction of movement of the positioning movement and / or joining movement, which can be performed with the feed unit.

[0034] The control unit of the finger joint press can be configured to control the movement speed and / or the pressing pressure of the feed unit as a function of a relative position, at least indirectly determined by the position measuring system, of the finger joint profiles to be joined and / or a traveled distance. Thus, the positioning movement and / or the joining movement can be carried out at the desired speed and / or the desired speed profile as a function of a relative position of the two finger joint profiles to be joined and / or as a function of a distance traveled by the feed unit and the at least one finger joint profile during the execution of the method.

[0035] An embodiment of the invention is explained below with reference to the figures. It should be noted that the invention is not limited to the embodiment shown in the figures. Further embodiments of the invention result from a combination of the features of the claims, the preceding description and / or the following description of the figures. They show:

[0036] Figure 1 is an isometric view of a wedge jointing press which is designed to carry out the method explained above,

[0037] Figure 2 is a front view of the wedge-jointing press shown in Figure 1, Figure 3 is a rear view of the wedge-jointing press shown in Figures 1 and 2, wherein a position measuring system of the wedge-jointing press can be seen on a frame of the wedge-jointing press,

[0038] Figure 4 is a plan view of the wedge joint press shown in Figures 1-3 with a component provided with a wedge joint profile on a clamping shoe of the wedge joint press that is movable with a feed unit of the wedge joint press,

[0039] Figure 5 is a side view of the wedge joint press shown in the previous figures with two components clamped on clamping shoes of the wedge joint press in the starting position,

[0040] Figure 6 is a side view of the wedge joint press shown in the previous figures with components approaching each other shortly before reaching the joining position and

[0041] Figure 7 is a side view of the wedge joint press shown in the previous figures with components in the target position during the pressing of the wedge joint profiles of the components.

[0042] The figures show a wedge jointing press , designated as a whole by 1 , which is designed to produce a wedge joint between two components 2 , 3 .

[0043] The top view of the wedge-jointing press 1 in Figure 4 shows one of the two components 2, 3, designated by the reference symbol 2. The reference symbol 3 indicates the position of the other component on the wedge-jointing press 1, but is not shown in the figures for reasons of clarity. The wedge-jointing press 1 is designed to carry out the method for producing a wedge-jointed joint already explained in detail above.

[0044] The finger joint press 1 has a control unit 4, a position measuring system 5, namely a precision position measuring system, and a hydraulic feed unit 6. Furthermore, the finger joint press 1 is equipped with a reference point determination system 7, for example a laser measuring system or another, preferably likewise contactless, measuring system, which is set up to determine a starting position of a component 2 to be moved on the finger joint press 1 to produce a finger joint connection and its finger joint profile 8. Furthermore, the reference point determination system 7 can be used to determine an initial distance between finger joint profiles 8 of the two components 2, 3 to be joined together as a reference point for the position measuring system 5 and the control of the feed unit 7 of the finger joint press 1, which can be carried out by the control unit 4.

[0045] The figures show that the finger jointing press 1 has a stationary, hydraulic clamping shoe 9 and a likewise hydraulic clamping shoe 10, which is movable with its feed unit 6, for clamping a component 2, 3. The stationary clamping shoe 9 and the movable clamping shoe 10 can each be moved from an initial position into a clamping position by means of a hydraulic cylinder 11. The hydraulic cylinders 11 are arranged above the clamping shoes 9 and 10 and can apply the clamping shoes 9 and 10 from top to bottom into their clamping position on a component 2 or 3 inserted into the clamping shoes 9 and 10.

[0046] The feed unit 6 also comprises a hydraulic cylinder 11, with which the movable clamping shoe 10 can be moved from its initial position shown in the figures in the direction of the arrows 12 shown in the figures, together with a component 2 clamped on the movable clamping shoe 10. The arrows labeled 12 illustrate the conveying direction in which the movable component 2 can be moved with the feed unit 6 to produce the wedge joint.

[0047] The control unit 4 is designed to control the movement speed and the pressing pressure of the feed unit 6 as a function of a relative position, at least indirectly determined by the position measuring system 5, of the two finger joint profiles 8 of the two components 2 and 3 to be joined together and as a function of a distance traveled by the component 2.

[0048] The wedge joint press 1 is designed to carry out the method explained below for producing a wedge joint between two components 2, 3.

[0049] The components 2, 3 have corresponding finger joint profiles 8. The method provides that at least one of the two components 2, 3, namely component 2, is first moved with its finger joint profile 8 into a joining position by the feed unit 6 of the finger joint press 1 in a positioning movement and is thereby brought closer to the finger joint profile 8 of the other component 3. Figure 6 shows component 2 in its positioning movement between the starting position and the joining position. The other component 3 is clamped on the stationary clamping shoe 9.

[0050] As soon as the finger joint profile 8 of component 2 has reached the joining position, component 2, together with the finger joint profile 8, is moved in a joining movement from the joining position to a target position within the finger joint profile 8 of the other component 3 and pressed together with it. Figure 7 shows the two components 2 and 3 in the target position during the pressing of the finger joint profiles 8.

[0051] The joining movement is carried out at a speed that is lower than a speed, for example lower than an average speed, of the positioning movement.

[0052] The finger joint profiles 8 of the two components 2, 3 can engage with each other in the joining position, which the components 2, 3 reach after completion of the positioning movement and after passing the position shown in Figure 6. For example, the finger joint profiles 8 can be pushed into each other in the joining position up to an insertion depth that corresponds to between one-third and one-half of the profile depth of one of the two finger joint profiles.

[0053] At least one of the finger joint profiles 8, for example the finger joint profile 8 of the component 3 clamped on the stationary clamping shoe 9, is provided with an adhesive, for example with a PU adhesive, before the finger joint profiles 8 are pressed together.

[0054] The adhesive can be applied in the form of an adhesive bead to the tips of the finger joint profile 8. This preferably occurs before the finger joint profile 8 of the component 2 clamped on the movable clamping shoe 10 is inserted into the finger joint profile 8 of the other component 3 and reaches the joining position.

[0055] The finger joint profiles 8 are then pressed together in a pressing step. A pressing pressure is built up, preferably continuously, to a defined target pressure, and this target pressure is maintained for a defined period of time to create the finger joint.

[0056] The feed unit 6 of the finger joint press 1 is controlled by the control unit 4 of the finger joint press 1 to execute the positioning movement, the joining movement, and a pressing step. The control unit 4 can be programmed with an appropriate program for this purpose.

[0057] The positioning movement into the joining position can, for example, be carried out at a linearly decreasing speed. At the beginning of the path covered by the component 2 clamped on the movable clamping shoe 10 from the initial position shown in Figure 5 via the intermediate position shown in Figure 6 into the joining position, the speed is thus higher than towards the end of the positioning movement, i.e., shortly before the component 2 has reached its joining position on the other component 3.

[0058] The positioning movement and the joining movement are each linear movements, which are both aligned in the same direction, namely in the conveying direction of the feed unit 6 illustrated by the arrow 12.

[0059] The positioning movement, the joining movement, and the pressing pressure can be controlled depending on the relative position of the finger joint profiles 8 to be joined and the path. This is done by the control unit 4 of the finger joint press 1.

[0060] The relative position of the two finger joint profiles 8 is determined using the position measuring system 5 of the finger joint press 1. The relative position of the two finger joint profiles 8 can be determined based on the measurement of a path already traveled by the component 2 with the feed unit 6. The position measuring system 5 can thus record the movement, for example, of the movable clamping shoe 10 displaced by the feed unit 6 in the direction of arrow 12 and make it available to the control unit 4 for controlling the process and in particular for controlling the speed and / or the pressing pressure specified by the feed unit 6.

[0061] Before the feed unit 6 is activated to move the component 2 in the direction of the component 3 clamped on the stationary clamping shoe 9,

[0062] In the referencing step of the method, a starting position of the finger joint profile 8 of the component 2 to be moved by the feed unit 6, a position of the other component 3 and its finger joint profile 8 and also an initial distance between the finger joint profiles 8 of the components 2 and 3 to be connected are determined. From the positions of the two components 2 and 3 and their initial distance, a reference point for a path measurement and a determination of a relative position of the finger joint profiles 8 of the two components 2 and 3 can be derived and used to control the feed unit 6 with the aid of the control unit 4.

[0063] The invention relates to improvements in the technical field of producing wedge joints. For this purpose, a method for producing a wedge joint between two components 2, 3 is proposed, in which method it is provided that at least one of two components 2, 3 to be joined together is moved into a joining position by means of a feed unit 6 of a wedge joint press 1 in a positioning movement and that the component 2, 3 with its wedge joint profile 8 is then moved from the joining position into a target position within the wedge joint profile 8 of the other component 2, 3 and pressed therewith. The joining movement is carried out at a speed that is lower than a speed, in particular than an average speed, of the positioning movement. / List of reference symbols

[0064] List of reference symbols

[0065] 1 wedge joint press

[0066] 2 component

[0067] 3 Component 4 Control unit

[0068] 5 Position measuring system

[0069] 6 feed unit

[0070] 7 Reference point determination system

[0071] 8 Wedge joint profiles 9 stationary clamping shoe

[0072] 10 movable clamping shoe

[0073] 11 hydraulic cylinders

[0074] 12 Conveying direction

[0075] / Claims

Claims

Claims Method for producing a finger joint connection between two components (2, 3) which have corresponding finger joint profiles (8), wherein at least one of the two components (2, 3) is moved with its finger joint profile (8) into a joining position by means of a feed unit (6) of a finger joint press (1) in a positioning movement and is thereby brought closer to the finger joint profile (8) of the other component (2, 3), after which the finger joint profile (8) of one component (2) is moved with the feed unit (6) in a joining movement from the joining position into a target position within the finger joint profile (8) of the other component (2, 3) and is pressed with the latter, wherein the joining movement is carried out at a speed which is lower than a speed, in particular than an average speed, of the positioning movement.Method according to claim 1, wherein the finger joint profiles (8) engage with one another in the joining position, preferably wherein the finger joint profiles (8) are pushed into one another in the joining position to an insertion depth which corresponds to between one third and one half of a profile depth of one of the two finger joint profiles (8). Method according to claim 1 or 2, wherein at least one of the finger joint profiles (8) is provided with an adhesive, in particular with a PU adhesive, a one-component adhesive and / or a multi-component adhesive, before the finger joint profiles (8) are pressed together. Method according to one of the preceding claims, wherein the adhesive is applied in the form of an adhesive bead to the tips of at least one finger joint profile (8) and / or in a surface application to the flanks of at least one finger joint profile (8). and / or the adhesive is applied before the at least one finger joint profile (8) reaches the joining position.

5. Method according to one of the preceding claims, wherein the finger joint profiles (8) are pressed together in a pressing step of the method, wherein a pressing pressure is built up, preferably continuously, up to a defined target pressing pressure and the target pressing pressure is maintained over a defined period of time in order to produce the finger joint connection.

6. Method according to one of the preceding claims, wherein the feed unit (6) for carrying out the positioning movement and the joining movement and a pressing step is controlled accordingly by a control unit (4) of the finger jointing press (1).

7. Method according to one of the preceding claims, wherein the positioning movement into the joining position is carried out with, preferably linearly, decreasing speed.

8. Method according to one of the preceding claims, wherein the positioning movement is a linear movement and / or wherein the joining movement is a linear movement, and / or wherein the positioning movement and the joining movement are carried out in the same direction.

9. Method according to one of the preceding claims, wherein the positioning movement and / or the joining movement and / or a pressing pressure is / are controlled as a function of a relative position of the finger joint profiles (8) to be joined together, in particular by a control unit (4) of the finger joint press (1).

10. Method according to the preceding claim, wherein the The relative position of the two finger joint profiles (8) is determined using a position measuring system (5), in particular of the finger joint press (1). Method according to one of the preceding claims, wherein, in a referencing step of the method, a starting position of at least the finger joint profile (8) to be moved by the feed unit (6) and / or a starting distance between the finger joint profiles (8) to be connected is determined, and a reference point for a position measurement and determination of a relative position of the finger joint profiles (8) is derived therefrom. Finger joint press (1) for producing a finger joint connection between two components (2, 3), characterized in that the finger joint press (1) is set up to carry out the method according to one of the preceding claims.Finger jointing press (1) according to claim 12, wherein the finger jointing press (1) has a control unit (4), a position measuring system (5), in particular a precision position measuring system, and / or at least one, preferably at least one hydraulic and / or at least one electromechanical, feed unit (6). Finger jointing press (1) according to claim 13, wherein the finger jointing press (1) has a reference point determination system (7), in particular a laser measuring system or another, preferably non-contact measuring system, which is used to determine a starting position of a component (2) to be moved to produce a finger joint connection and its finger joint profile (8) and / or an initial distance between finger joint profiles (8) of two components (2, 3) to be joined together. Reference point for the position measuring system (5) and the control of the feed unit (7) of the finger jointing press (1) is set up.

15. Finger jointing press (1) according to one of claims 12 to 14, wherein the finger jointing press (1) has a stationary, preferably hydraulic, clamping shoe (9) and a preferably hydraulic, clamping shoe (10) movable with its feed unit (6) for clamping a respective component (2, 3).

16. Finger jointing press (1) according to one of claims 13 to 15, wherein the control unit (4) is set up to control the movement speed and / or the pressing pressure of the feed unit (6) as a function of a relative position of the finger joint profiles (8) to be joined together, which relative position is determined at least indirectly by the position measuring system (5), and / or as a function of a distance traveled by the feed unit (6) and the at least one finger joint profile (8). / Summary

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