WO2014180771A1

WO2014180771A1 - Returning mechanism for returning a setting device into a starting position

Info

Publication number: WO2014180771A1
Application number: PCT/EP2014/059078
Authority: WO
Inventors: Fabio Luongo
Original assignee: Adolf Würth Gmbh & Co.Kg
Priority date: 2013-05-06
Filing date: 2014-05-05
Publication date: 2014-11-13
Also published as: DE102013208281A1

Abstract

Returning arrangement (72) for returning a movable push rod (10) of a setting device (30) for setting a fastening element (66) into a starting position, wherein the push rod (10) is transferred from the starting position into a setting position during the setting of the fastening element (66), wherein the returning arrangement (72) has a flexible inelastic drawing element (21) with a first portion (96) and with a second portion (98), which can be coupled to the push rod (10) at the first portion (96), and has a tensioning device (94), which is coupled to the drawing element (21) at the second portion (98), and so, when the push rod (10) is transferred from the starting position into the setting position, the tensioning device (94) can be transformed into a tensioned state, in which the tensioned tensioning device (94) exerts a returning force on the push rod (10) by means of the drawing element (21) to return the push rod (10) into the starting position.

Description

Return mechanism for returning

a Setzqeräts in a starting position

The invention relates to a return arrangement for returning a plunger of a setting device for setting a fastener in a

Starting position, a setting device, a setting arrangement and a method for operating a setting device for setting a fastener by means of a movable plunger.

For setting fasteners such as nails, bolts or

It is known, for example, to use devices in which a ram is driven forward in a jerky manner, which acts on the fastening element and drives it into the ground. So that the ram for the driving of the

Fastening element can transmit sufficient impulse, it should be accelerated on the one hand to a high speed and on the other hand provided with a sufficiently large mass or connected. To the high

To achieve speed, different drive types are known, for example, explosion-powered devices in which a propellant charge is ignited. Also known are devices in which a rotating flywheel is connected to the plunger via a coupling. For all types of drives, the plunger must be moved back to its original position, in order then to carry out a next fastening operation can. These

Backward movement can be due to mechanical connections, at

explosion-powered devices by diverting a portion of the drive gases, or manually be realized by hand.

EP 2,429,768 discloses a setting device for the sudden setting of

Nails, bolts or the like, which has a striking body with a striking mass, which acts via a plunger on the head of the bolt element to be set and this drives into the ground. To drive the

Impact body is provided a drive, which consists of two a passage between them forming flywheels, which rotate in opposite directions about two parallel axes of rotation. The inserted between these flywheels Impact body is slightly larger in the transverse direction than the distance of the flywheels from each other, so that they attack with great force on the surface of the impactor and accelerate it in the direction of the bolt to be set. After leaving the flywheels, the plunger strikes the bolt. To allow the striker to return between the two flywheels without removing them, the striker is rotated about its longitudinal axis to a position where its transverse extent is less than the distance between the two flywheels. As a result, he lets with a little effort by a rubber band in its starting position

pull back, where he is turned back to the original angular position.

DE 40 40 508 AI discloses a designated as Eintreibwerkzeuges

Setting tool for fasteners such as U-shaped staples or simple nails. The driving tool includes (a) a plunger, (b) a

Flywheel, which is frictionally coupled with the plunger for driving the plunger along a discharge channel and (c) energy-storing

Return means for returning the plunger.

DE 10 2005 000 061 A1 discloses an electrically operated tacking device for fastening elements. The tacker has a rear part via which a driving ram can be transferred to a starting position after a driving operation. The rear part device has a rear part motor, which acts on the drive tappet via a return means. The rear part motor can be operated independently of an electric drive unit for the drive ram for driving a fastener. As a result, a flexible controllable feedback of the driving ram is possible.

DE 20 2007 017 485 AI discloses a hand-held tacker for fasteners. The tacker has a drive arrangement for a displaceably mounted in a guide drive tappet. The drive arrangement has a drive spring element, which can be tensioned via a tensioning device by means of at least one transmission belt. The tensioning device is after a drive-in for the return of the drive ram and the Clamping the drive spring element used. About the clamping device of the driving ram is moved against the drive spring element and this is thereby stretched again. A pawl prevents the

Release tappet prematurely and is activated only for a new drive.

WO 2010/130 678 AI discloses a setting device for the sudden setting of fasteners such. As nails, bolts or the like. The

Setting tool has a striking body with a striking mass, which acts via a plunger on a head of the fastener to be set and this drives into the ground. To after performing a

Fastening process the impactor back to its original position, the impactor is rotated about its longitudinal axis so that it is in an angular position in which its transverse dimension is smaller than the distance between two flywheels, by means of which the plunger is accelerated in a driving operation. In this way, the plunger can be easily returned by means of a return means in the same way in its initial position on which he was previously moved forward. The

Return means may be a tension spring or a simple rubber band

exhibit . The rubber band can be deflected within a housing of the setting tool to a deflection roller.

It is an object of the present invention to provide a further improved fastener placement system.

This object is solved by the objects with the features according to the independent claims. Further embodiments are shown in the dependent claims.

According to an embodiment of the present invention, a return assembly for returning a movable plunger of a setting tool for setting a fastener (e.g., a blind rivet) to a home position (i.e., a defined position from which

Setting process can be initiated), wherein the plunger when setting the Fastener is transferred from the home position to a set position, the return assembly comprising a flexible inelastic (ie, a bendable but non-stretchable) tension member having a first portion (eg, a first end portion) and a second portion (e.g., but not necessarily, a second end portion) coupled or coupled to the plunger at the first portion (directly, ie without an intermediate member, or indirectly, for example by means of an impactor), and a

(In particular elastic or spring-like) clamping device which is coupled to the second portion with the tension element, so that the

Clamping device when transferring the plunger from the starting position to the set position in a tensioned state (in particular a deflected state in which the tension element exerts a repulsive hookesche force) can be transferred, in which the tensioned tensioning means by means of the tension element on the plunger a return force for returning the Pestle in the

Starting position exerts.

According to a further embodiment of the present invention, a setting device, in particular rivet setting device, for setting a

A fastener provided, wherein the setting device, a movable plunger, which is transferred when setting the fastener from a starting position to a set position, a drive unit (for example comprising a drive motor which drives rotatable flywheels for accelerating the plunger) for driving the movable plunger and for transferring the plunger from the initial position to the set position, while the plunger on the fastener, a setting force for setting the

Fastening element transmits into a target object, and having a return assembly having the features described above for returning the plunger to the starting position after setting of the fastener.

According to a further exemplary embodiment of the present invention, a setting arrangement is provided, which comprises a setting device with the above-described features for setting a fastening element and the Fastening element which is in particular settling on or in the

Setting device can be mounted.

According to a further embodiment of the present invention, a method for operating a setting device for setting a

Created fastener by means of a movable plunger, wherein a flexible inelastic tension member having a first and a second

Section is provided and this is coupled to the first portion with the plunger and to the second portion with a clamping device

is coupled, wherein in the method, the fastener is set in a target by means of transferring the plunger from a starting position to a set position during which the plunger on the fastener transmits a setting force, and the clamping device in a clamping state upon transfer of the plunger from the starting position in the set position is transferred, so that the clamping device in the clamping state by means of the tension element on the plunger exerts a return force for returning the plunger to the starting position.

According to the invention, due to the provision of an inelastic but flexible tension member in combination with one of them separate, in

Setting process clamping energy receiving clamping element a wear-resistant repeating system for retrieving the plunger after a setting operation in an initial position for preparing a subsequent further setting process created. The inelastic but flexible tension element has favorable

Gleitreibungseigenschaften, whereas the tensioning element effectively a

Clamping force can build up when the plunger moves away from its starting position during the setting process. This allows repeating the mass of ram and impactor over a large distance by means of the tension element (for example, a cord) and a tensioning element (for example, a tension spring).

Due to the ram-induced drive-in technology with a

Flywheel drive requires the setting tool a relatively long distance, which has to cover the accelerated mass for setting and returning. For a repeating setting process to be executed, the Mass returned to its original position after driving. The provided repeating system withstands the high accelerations, works in any application direction (top, bottom, side or horizontal) of the setting device and comes without significant or

detrimental loss of withdrawal power across the entire

Lifetime.

In the following, additional exemplary embodiments of the return arrangement, the setting device, the setting arrangement and the method will be described.

According to one embodiment, the tension element may consist of a

Plastic, in particular of polyester, and / or of a metal, in particular of steel, be formed. Such materials have a high tensile strength over the entire life. In particular, when providing the tension member made of a plastic material, such as polyester, it can be ensured that the tension member during its movement along one or more components, such as pulleys, sliding friction. Illustratively, this sliding is more from the perspective of rolling friction than under the

Viewpoint of slip. Thus, in such an embodiment, the

Pulling element on rollers or other elements wear-resistant to wear-free feasible.

According to one embodiment, the tension member may comprise a woven or braided material. Such a trained as a weaving or wicker traction element can be formed by frictional crosslinking of filaments or threads and thus be designed extremely low wear at a high tensile strength and low weight.

According to one embodiment, the tension element may comprise a core and a jacket at least partially surrounding the core. Such a core may, for example, be optimized to hold reliably under the high forces and impulses and be formed, for example, of a metallic material. In contrast, the coat with regard to its sliding properties on the environment or the cooperating Components are adapted or optimized, for example

Plastic exist.

According to one embodiment, the tension element may have a

Have diameters in a range between about 1 mm and about 4 mm, in particular in a range between about 2 mm and about 3 mm. Cord diameter and material can be adjusted to withstand the stresses throughout the life of the equipment. For example, an advantageous diameter of a tension member configured as a polyester cord may be 2.5 mm ± 1.0 mm. Too small a diameter should be avoided to reliably prevent tearing at the high forces acting. On the other hand, a too large cord diameter should be avoided to avoid undesirable high friction. Also, with a too large cord diameter, the resulting high mass thereof at the expense of the acceleration of the plunger and an undesirably high

Energy consumption and demand lead.

According to one embodiment, a local thickening of the tension element in a corresponding one of the first portion

Receiving cavity of the plunger or one connected to the plunger

Impact body be accommodated in particular form-fitting. For example, the tension member may be a constant along its entire extent

Have circular cross-section, but at one or both ends have, for example, a spherical thickening. For example, a thickened

End portion of the tension member are inserted into a correspondingly shaped groove in the plunger or in the associated impactor and then closed, for example by placing a lid or the like. In this way, a reliable and sufficiently flexible connection between the tension element and the plunger is made possible, while still leaving a certain amount of compensation or a certain amount of play in order not to expose the connection to high loads during the movement of the plunger or the tension element. According to one embodiment, the tensioning device may have elastic properties or hook-like spring properties. This means that upon deflection of the tensioning device as a result of a setting movement of the plunger a restoring force is generated, which is proportional to the deflection. In particular, the clamping device for this purpose may comprise a tension spring, in particular a spiral spring. Thus, the spring can be tensioned by moving the plunger from the home position to the set position, so that mechanical energy is stored in the spring. Of the

Repeating mechanism can then be using this

cached energy by using this potential energy to return the plunger. This is a mechanically simple and fully automatic system for returning the plunger in the

Starting position created before performing another riveting. As an alternative to a coil spring other spring systems are possible, such as a plate spring or a package of disc springs, a leaf spring, etc. It is also possible, instead of a spring, the energy as electric or

magnetically stored, for example, by moving two homopolar charged metal plates toward each other under the influence of the plunger movement or two oppositely charged metal plates are moved away from each other under the influence of the plunger movement. An appropriate one

Mechanism can also be achieved by using homopolar or reverse polarity magnets.

According to one embodiment, the tensioning device,

in particular the tension spring, along at least part of its

Longitudinal extension of a protective casing, in particular of a

Ummantelungsröhrchen, be surrounded. Such a jacket is advantageous in order to protect the clamping device from external influences, but above all to reduce unwanted vibration influences. Such an optional sheath or sleeve can be a big game between

Clamping device (in particular spring) and balance housing and can thus undesirable natural oscillations of the clamping device (in particular the Spring), which could otherwise disturb, suppress or eliminate the repeating system.

According to one embodiment, one end of the tensioning device may be rigidly mounted and the opposite other end of the

Clamping device to be coupled to the tension element. For example, the rigidly mounted end of the tensioning device may be fixed to a housing of the setting device, whereas the opposite end may be connected to the tension element together movable.

According to one embodiment, the clamping device on the second portion of the tension element, a deflecting element, in particular a

Guide pulley, have, wherein the clamping device is coupled by means of the deflecting element with the tension element. The connection between cord and

Tension spring can thus take place via a deflection element of low mass to reduce impact effects. Roller size and material of the deflector can be selected so that the role of the loads and the

Wear and tear over the entire life of the device. The provision of at least one deflecting element on the clamping device can illustratively produce a type of pulley with which even plunger movements over a large length are made possible with a space-saving accommodated repeating arrangement. If a pulley is used, it can be graphically shortened the stroke of the element, in particular even be halved. A larger number of deflecting elements on the

Clamping device can further reduce the stroke lengths and thus a

compact design of the repeating mechanism and consequently of the entire

Setting device allow.

A shaft or bearing of the kind described above

Deflection element for coupling the tensioning device with the tension element can by a co-moving in a plunger movement portion of

Passed clamping device and be mounted on it. An axis of rotation of this deflecting element can be perpendicular to a direction of movement of the

Be tensioning device oriented at a plunger movement. The deflecting element can be suspended to be rotated by a plunger movement itself (with a movement of the plunger from the starting position in the

Setting position, a rotation of the deflecting element in a first direction can take place, and upon movement of the plunger from the setting position in the

Starting position, a rotation of the deflecting element in a second direction, which may be opposite to the first direction, can take place). The

Tensile element may be at least partially guided around the deflecting element.

According to one embodiment, the tension member may be rigidly mounted on a third portion (which may be an end portion of the tension member), the second portion being disposed between the first portion and the third portion. As a result, for example, a pulley can be formed. For example, the tension member may be connected to the third portion with a housing member of the setting device, while the tension member is resiliently mounted on the second portion to at this point at a Hinbzw. Return movement of the plunger itself to be moved.

According to one exemplary embodiment, the tension element can be rigidly mounted by means of a clamping connection between two housing parts which clampingly engage the third section, in particular for housing the tensioning device and at least part of the tension element. These two

Housing parts can, for example, two half shells within the

Setting tool housing, which are moved toward each other for pressing a cord end. The clamping of the cord can thus directly between

Plastic housing parts take place, thus only by friction. Such a connection is reliable and easy to handle when replacing the cord due to wear.

According to one embodiment, the return assembly

Have at least one further deflecting element, in particular at least two further deflection rollers with each other helical deflection axes, between the plunger and the clamping device for deflecting the tension element. Such a deflection device allows a compact design of the setting device. The mutually non-parallel arrangement of the deflection axes allows a

Redirection in different levels. By providing several windschiefer pulleys with mutually non-parallel axes can thus a

space-saving accommodation of Repetieranordnung be made possible.

In the following, exemplary embodiments of the

Present invention described in detail with reference to the following figures.

Fig. 1 shows a return arrangement for returning a setting device for setting a fastening element into a starting position according to an exemplary embodiment of the invention.

Fig. 2 schematically shows a section through a setting tool according to an exemplary embodiment of the invention.

Fig. 3 to FIG. 8 show cross-sectional views of a setting tool according to an exemplary embodiment of the invention in different operating states.

Fig. 9 shows a spatial top-side view of the setting device according to FIG. 3 to FIG. 8 and a view of individual assemblies of this setting device.

Fig. 10 shows a spatial, underside view of the setting device 30 according to FIG. 3 to FIG. 9th

Fig. 11 to FIG. 21 show a triggering mechanism of a rivet setting apparatus according to an exemplary embodiment of the invention.

Fig. 22A to FIG. 22C show an interaction between a plunger and a drive unit of a setting tool according to an exemplary embodiment

Embodiment of the invention in different operating conditions.

Fig. Fig. 23 shows a setting device and different views of one

Return arrangement of the setting device according to an exemplary

Embodiment of the invention.

Fig. 24 shows a return assembly according to an exemplary embodiment

Embodiment of the invention.

The same or similar components in different figures are provided with the same reference numerals. Fig. 1 shows a ram repeating system 72 according to an exemplary embodiment of the invention. This in Fig. 1 schematically shown

Plunger repositioning system 72 may, for example, be integrated into a rivet setting apparatus 30 for setting a blind rivet 66 (FIG. 10), as described below with reference to FIG. 2 to FIG. 10 will be described.

Fig. Figure 1 shows a plunger 10 which, when the ram repeating system 72 is mounted in a rivet setting tool, can be accelerated with one end 11 towards a blind rivet, such that the blind rivet is then driven into a target object, such as two metal plates to be attached to each other can. The plunger 10 is coupled via a striker 9 with a tension member 21 which is formed in the described embodiment as non-stretchable, but bendable polyester cord. Via a pulley 20, the tension member 21 is connected to a tensioning device 94, which has an elastic coil spring 100 with hookescher Auslenkcharakteristik.

Fig. Fig. 1 shows the plunger 10 in its initial position, i. E. in static

Position before the start of the riveting process. When the plunger 10 hits a rear side of the blind rivet mounted in the setting tool during the riveting process, the plunger 10 assumes its setting position.

When a blind rivet is set by means of the plunger 10, the plunger 10 moves under the influence of a drive motor 68, the two flywheels 13 in opposite directions in rotation, the plunger 10 of FIG. 1 to the left toward a rear side of the blind rivet (not shown). In order to drive with the setting tool at a later time another blind rivet in a target object, it is necessary to return the plunger 10 back to the starting position, so that the cycle can start anew.

A striker 9, on which the plunger 10 is mounted, is disposed between the two flywheels 13, which can be driven in opposite directions in the direction of arrows 14 by the drive motor 68 (an electric motor). The flywheels 13 may (as shown in FIG. 1) be arranged at a distance from the impactor 9 and then do not act on the impactor 9. The flywheels 13 can also be moved towards each other (ie. delivered) and then accelerate the impactor 9 and consequently the plunger 10th

For returning the plunger 10 for setting a further blind rivet in an initial position which serves in Fig. 1 shown return assembly 72, which will be described in more detail below.

The tension member 21 of the return assembly 72 is formed as a flexible and substantially inelastic component that is not stretchable under tensile load (or not technically significant extent to the technical understanding of the skilled person), but bent, for example, with little force when circulating around the guide roller 20 can. The tension member 21 has a first portion 96 (here formed as an end portion) to which the tension member 21 is indirectly connected via the impactor 9 with the plunger 10. The tension member 21 further has a second portion 98 (here formed as an end portion) to which the tension member 21 is connected directly to the tensioning device 94.

The tensioning device 94 includes the coil spring 100, which is rigidly and stationarily mounted on a first end portion 104 on a housing part 118 or the like, and has a second, opposite end portion 106, to which the coil spring 100 is connected to the second portion 98 of the tension member 21 ,

The tension member 21 is used for force conversion or for transmitting a tensile force between the plunger 10 and coil spring 100, but is not stretched in such an applied tensile force even in a technically significant way, but transmits the force unchanged to the separately formed by the tension member 21 coil spring 100, which deflected by the action of such a force, in particular stretched, is. If, therefore, to drive in a blind rivet, the plunger 10 according to FIG. 1 moves from right to left, the spring 100 is stretched maximum. At the same time, when the plunger 10 is transferred, the tensioning device 94 is transferred from the starting position into the set position into a clamping state or into a tensioned state. In this clamping state, the coil spring 100 exerts a restoring force on the tension element 21 and thus indirectly on the plunger 10 off. When the plunger 10 is thus released from the setting tool for performing a backward movement, the clamping device 94 exerts by means of the tension element 21 on the plunger 10, a return force to

Returning the plunger 10 in the starting position and thus for returning the plunger 10 in the starting position, whereby they by a

Rebound effect of the plunger 10 is supported.

The tension member 21 formed as a polyester fabric in the described embodiment has a constant diameter d of 2.5 mm apart from its ends. As a result, the tension element 21 on the one hand is sufficiently light to not itself a large mechanical load during the

On the other hand, it is sufficiently robust to withstand the large forces involved.

At the first portion 96 and at the second portion 98, the tension member 21 is locally thickened, so that with the striker 9 on the one hand a positive connection and the coil spring 100 on the other hand, an adhesive or clamp connection can be created.

2 shows schematically a setting device according to an exemplary embodiment of the invention, which has a housing 1. The housing 1 has a front end 2, in which a holder 3 is arranged for a bolt to be set or a blind rivet to be set. The housing 1 contains a handle 4, on which a user can attack. On the handle 4 is a

Trigger button 5 or more shutter buttons 5 are arranged, with the help of which the user can trigger a setting process and thus perform. From the front end 2 of the housing 1, a connecting piece 6 connected to the holder 3 protrudes, which is pressed against a base on which an attachment is to be made, in order thereby to overcome a triggering lock. At the foot of the handle 4 and on an underside of the housing 1, a receptacle 7 for a power supply unit (for example, an accumulator, a battery or a power adapter) is attached.

The in Fig. 2 setting tool contains two motors: A first motor 8 serves to set two flywheels 13 in rotation. Actuate the rotated flywheels 13 on a

Impactor 9 and subsequent to a plunger 10, so the actual acceleration process of the plunger 10 is triggered on a blind rivet inserted into the holder 3 and the nozzle 6. The first motor 8 can as

Be formed electric motor, the flywheels 13 via a V-belt (not shown in Fig. 2) in rotation.

A second motor 18 serves to move the two flywheels 13 against each other such that they are delivered to the striker 9 out. This means that in the example shown, the upper of the two flywheels 13 is subjected to a translation in the direction of the impactor 9, so that subsequently the two flywheels 13 engage opposite surfaces of the impactor 9, which - when the first motor 8 the

Flywheels 13 Provides rotational energy - triggers the setting process. The second motor 18 is also used, in another operating state of the setting device, to deduct a residual mandrel from the blind rivet after retracting a blind rivet into sheet metal plates or the like and to withdraw it into the interior of the setting device. The second motor 18 may have an electric motor and act on a spindle driven thereby as the actual drive.

The impactor 9 is under the influence of the flywheels 13 in the housing 1 along its own longitudinal direction movable and has at its front end to the plunger 10, the end 11 to hit the head of a Setzniets or bolt, which is attached to the bracket 3 and the nozzle 6 is mounted.

The impactor 9, whose rear end in Fig. 2 is still visible, is stored and guided in a guide 12, which determines its path. The guide 12 passes between the two flywheels 13 therethrough. The flywheels 13 are by means of parallel, perpendicular to the plane of the drawing of FIG. 2

stored extending axes and are driven in the direction of arrows 14 by the motor 8 in opposite directions. Their distance from each other is so on the Impactor 9 tuned that this, when it is arranged in a first position between the two flywheels 13, is touched by the surfaces of both flywheels 13. As a result, the flywheels 13 are capable of their rotational movement in a linear movement of the impactor. 9

implement. The distance is further adapted to the impactor 9, that this, when it is arranged in a second position between the two flywheels 13, is spaced from the surfaces of the flywheels 13. A transfer of the setting device between the two positions accomplished the motor 18th

To set a mounted in the holder 3 and the nozzle 6

Bolts into a target object, a user presses the socket 6 with a bolt inserted against the target object and presses the release button (s) 5. The motor 8, see also Fig. 10, now drives the flywheels 13. The impactor 9 and the flywheels 13 are brought into operative connection by means of the motor 18, whereby the plunger 10 is accelerated in the direction of the bolt. Thereby, the plunger 10 exerts a driving force on the bolt, which is consequently driven into the target object.

After driving the bolt, for which the plunger 10 is conveyed with its end 11 on the head of the bolt, which is housed in the socket 6, the striker 9 can be pushed back or withdrawn. For this purpose, a tension element 21 can serve, which is fastened, for example, at the rear end of the impactor 9 and, for reasons of saving space, is guided around the housing 1 by one and optionally a plurality of deflection rollers (s) 20. Again by means of the motor 18, the residual mandrel is pulled, which is then fully conveyed into the housing 1.

In the following, referring to FIG. 3 to FIG. 21 on

fully automatic riveting tool 30 for direct assembly of blind rivets described according to an exemplary embodiment of the invention.

First, Fig. 3 to FIG. 8 cross-sectional views of the rivet setting device 30 in different operating states. Based on this, a rivet setting cycle will be described below. Fig. 3 shows the rivet setting device 30 in a starting position. These

Starting position corresponds to an operating state that is assumed after, in a preceding method, a blind rivet 66 (shown in Fig. 4) has been driven into two metal plates 62, 64 (shown in Fig. 4) to be fastened together. In this case, a front Blindnietteil remains with a positive locking head in the metal plates now secured to each other 62, 64, by means of retracting the mandrel of the blind rivet 66 after its driving into the metal plates 62, 64 at a predetermined breaking point 34 of the residual mandrel 32 is separated from the front Blindnietteil whereby the blind rivet 66 is divided into two separate rivet parts. The remaining mandrel 32 remains within the

Rivet setting device 30, as shown in FIG. 3 shown. The predetermined breaking point 34 of the blind rivet 66 forms the transition between the in Fig. 3 shown residual mandrel 32 and the already driven front Blindnietteil.

According to FIG. 3 stuck from a previous setting nor the remaining mandrel 32 secured in a collet 36 of the holder 3. The collet 36 has clamping jaws 38 for engaging the residual mandrel 32, wherein

corresponding profiling on abutting surfaces of the clamping jaws 38 on the one hand and the remaining mandrel 32 on the other hand ensure a secure mutual grip.

In the in Fig. 3 operating state, a further triggering a riveting is prevented. By means of an Anpressdetektiereinheit 46 can be detected whether a blind rivet 66 inserted into the holder 3 by a user against a target object, in particular a metal plate 62, 64, is pressed or not. For safety reasons, only upon successful detection of such a pressing by means of the Anpressdetektiereinheit 46 a

subsequent setting process allows. If the Nietsetzgerät 30 is pressed without inserted blind rivet 66 to a target object, a

Safety sleeve 88 not completely pressed - there is a gap between a cover 90 and the safety sleeve 88. Anpresskontakte the

Anpressdetektiereinheit 46 but only closed when the

Safety sleeve 88 is pressed into the recess of the lid 90. This is without used blind rivet 66 mechanically impossible. A rivet setting can not be triggered in this state without inserted blind rivet 66, since a solenoid 40 (best seen in Fig. 4) locks the trigger mechanism until the contact between contact elements on the

Anpressdetektiereinheit 46, which are operatively coupled to the safety sleeve 88 is closed. Fig. 3 further shows a return spring 92 for

Resetting the safety sleeve 88 in a starting position when a

Pressing is stopped. According to FIG. 3 is but a contact at the

Safety sleeve 88 interrupted, the solenoid 40 is in a blocking position.

The plunger 10 is shown in FIG. 3 by means of a direction indicated by reference numeral 42 plunger lock, which may be formed as a latch mechanism, secured. Furthermore, according to FIG. 3, the flywheels 13 in an open state. The associated flywheel drive is switched off.

A tappet feed 52 is for guiding the plunger 10 and with the

Tappet 10 cooperating impact body 9 is formed. At the

Tappet feed 52 tension springs 54 are provided, which in the later

Method of a spindle 50 can be stretched and relaxed during rivet driving to vorzubeschleunigen the plunger 10 from engagement with the flywheels 13. The spindle 50 can be driven by means of a motor 18 (in particular an electric motor) in order to carry out a linear spindle movement for triggering a riveting operation.

A speed selection switch 56 is user-operable to set a desired operating or target speed of the drive motor 8. Fig. Incidentally, FIG. 3 also shows a V-belt 55 of the drive 8. The rotational speed may be adjusted based on characteristics (for example, material, thickness, number) of the components to be connected to each other by a rivet connection, in the example shown, the metal plates 62, 64.

In order to prepare a subsequent setting process after a previous setting operation, a riveting rivet 66 can be inserted into the riveting setting device 30. 4 shows the rivet setting device 30 in an operating state in which the new blind rivet 66 has been inserted into socket 6, the remaining mandrel 32 has already been transferred into a collecting container and the rivet setting device 30 is attached to two metal plates 62 to be fastened together by forming a riveted connection. 64 is pressed as a target object for the blind rivet 66.

As the rivet setting device 30 in the in Fig. 4 shown operating state is described below:

Before a subsequent Nietsetzvorgang can be started, the remaining mandrel 32 is first transferred to a mandrel disposal unit 44, where it can be stored together with a variety of other residual thorns. For this purpose, a new blind rivet 66 is pushed into the holder 3, whereby this blind rivet 66 the remaining mandrel 32 to a magnet holder of

Thorn removal unit 44 advances, which magnet holder holds magnets for supporting the mandrel disposal.

Now, a trigger 5, not shown in FIG. 4, is actuated (for example tapped) by a user for a first time to start the rivet setting device 30, thereby causing the flywheels 13 to move. The flywheels 13 are set to a user-side set speed in rotation. The displacement of the flywheels 13 in rotation thus takes place when the trigger 5 has been actuated for the first time, since this triggers the starting of the drive motor 8 for driving the flywheels 13. The trigger 5, the one

Abzugssbetätigungselement 58 and a securing actuator 60 which, for triggering a Nietsetzvorgangs for the sake of

Operational safety both must be actuated, is shown in Fig. 9 and FIG. 10.

By the rivet setting device 30 to the metal sheets 62, 64 with a

sufficient force is pressed, the contact in the

Anpressdetektiereinheit 46 in operative connection with the safety sleeve 88 is closed, and the solenoid 40 is the lock or the

Release mechanism 232 (Figure 15) free. If a blind rivet 66 is inserted into the rivet setting device 30, when the rivet setting device 30 is pressed onto the metal plates 62, 64, the safety sleeve 88 is pressed into the recess in the lid 90. The Anpresskontakt is closed and the solenoid 40 unlocks the

Trigger mechanism. The actual settlement can now be triggered via the trigger 5.

For this, the user presses after first pressing the

Trigger actuation element 58, the safety actuator 60 and thereby unlocks a mechanical trigger lock, the previously full

By pushing the trigger actuation element 58 has prevented. Only after this unlock is a repeated or further pressing the

Abzugssbetätigungselements 58 mechanically enabled, which makes it to

Triggering a Nietsetzvorgangs comes.

As a result of the repeated actuation of the trigger actuator 58 after unlocking, a first phase of a spindle stroke of the spindle 50 is triggered forward (i.e., to the left as viewed in Fig. 4), for which the motor 18 provides drive energy. This advancement of the spindle 50 causes, if by a previous Nachschieben a new blind rivet 66 of the remaining mandrel 32 has been advanced to the magnet holder, that the residual mandrel 32 is further pulled by magnets of the magnet holder into the magnet holder inside.

In a subsequent second phase of the spindle stroke of the spindle 50 to the front of the remaining mandrel 32 is held in the magnet holder. Further, a plunger carriage is pulled forward and the tension springs 54 are biased. With energy from this bias, the plunger 10 can be pre-accelerated later by relaxing the tension springs 54 before the plunger 10 is subjected to a main acceleration by means of the flywheels 13. The flywheels 13 can be closed with or via Spindelhub, d .h. be moved towards each other to follow on the

Impact body 9 of the plunger 10 to act. Release lever of the

Trigger mechanism can be preloaded. The release levers are pivotally mounted and cooperate with other levers when releasing the plunger 10 to trigger the setting process. If the spindle 50 has reached its foremost position, is in a third

Phase of the spindle stroke of the remaining mandrel 32 disposed in the mandrel disposal unit 44. The magnet holder, during the spindle stroke, guided by a guided in turn in a slide guide 74 guide member 76 down and releases a Eintreibbahn along which then the plunger 10 can be moved to the newly inserted blind rivet 66 in the metal sheets 62, 64th collect.

The slotted guide 74 has a guide recess in which the

Guide element 76 can be used, which in turn acts on the magnet holder.

Thus, the guide member 76 is a body that can be guided in the slide guide 74 and thereby by controlling the magnetic holder on the one hand the

Moving forward of the plunger 10 is activated or deactivated and on the other hand contributes to the Restdornentsorgung.

The plunger 10 is then pre-accelerated by relaxing the tension springs 54. If the plunger 10 or its impact body 9 comes into the sphere of influence of the compressed flywheels 13, they accelerate the pre-accelerated plunger 10 to such a speed that the

Plunger 10 the new blind rivet 66 in the metal sheets 62, 64 drives.

FIG. 5 shows the rivet setting device 30 in an operating state in which the blind rivet 66 inserted into the holder 3 is driven into the metal plates 62, 64 to be joined by the end 11 of the ram 10 coming back onto the blind rivet 66.

When the spindle 50 has moved sufficiently far forward, the rivet initiation is triggered by a triggering mechanism

(See also Fig. 11) or trigger 70. Thereby, the plunger 10 is released, and the driving operation is carried out. Immediately after the

Riveting process are the flywheels 13 again in an open state, ie. they no longer act on the striker 9.

The plunger or the plunger feed 52 is then returned to the

Initial situation withdrawn. The retraction of the plunger 10 in the

Starting position and the triggering of the withdrawal are by means of the spring 54

(or by means of the springs 228, 224, see for example Fig. 15) performed. One associated ram repeating system 72 is shown in FIG. 9 is designated by reference numeral 72. The ram repeating system 72 provides for returning the plunger 10 to the initial state after a riveting operation has been performed. The ram repeating system 72 includes the pulleys 20 and the tension member 21 which is attachable to the shock body 9 at one end and which is deflected over the pulleys 20 on the principle of a cable. By providing these pulleys 20, the ram repeating system 72 and consequently the entire riveting tool 30 can be made compact.

Fig. 6 shows the rivet setting device 30 in a state in which the plunger 10 is braked and the residual energy of the plunger 10 is dissipated. This over-energy of the plunger 10 is reduced by means of a plunger brake 48, which is formed in the described embodiment as an elastomeric brake. The plunger brake 48 can when moving the plunger 10 for

Driving the blind rivet 66 absorb kinetic energy of the plunger 10 and thus act as an attenuator.

As a result of the drive-in path resulting when the blind rivet 66 is driven in, the setting device 30 moves in the direction of the metal sheets 62, 64 and against them

the setting device 30 must now be attached to the metal sheets 62, 64 or be tracked to this, in order to carry out the drawing of the remaining mandrel 32.

Fig. 7 shows how the rivet setting device 30 is adjusted. By repositioning the contact on the safety sleeve 88 is closed again. In the meantime, the tappet 10 and the impact mass or the impact body 9 have already been repeated by the tension element 21 designed as a cord (for example an inelastic nylon cord or an elastomeric cord), that is to say, as shown in FIG. 7 transported to the right, and secured at the respective starting position. Now a Dornzugprozess is triggered, the result Fig. 8 shows.

Fig. 8 shows the rivet setting device 30 in forming a closing head. The spindle 50 moves back. The clamping jaws 38 are wedged in a profiled section of the blind rivet 66, so that the residual mandrel 32, ie. the rear portion of the blind rivet 66, by the reset movement from the rest of the blind rivet 66 (the in the metal plates 62, 64 remains) is torn off. The residual mandrel 32 is thus pulled and formed the closing head. The mandrel break takes place at the predetermined breaking point 34. In the mandrel drawing process, the rivet setting device 30 thus exerts a function according to FIG. 8 to the right acting force on the driven blind rivet 66 in order to effect breakage of the blind rivet 66 at the predetermined breaking point 34 so that only the remaining mandrel 32 remains inside the rivet setting device 30, whereas the front blind rivet part, which causes the actual fastening function, within the metal plates 62, 64 to be joined remains. In the rivet setting process described, a closing head is produced on the part of the blind rivet 66 remaining within the metal plates 62, 64, and thus a form-locking connection which forms the metal plates 62, 64

holds together.

A comparison between FIG. 7 and FIG. 8 shows that in the final phase of the setting process, the guide element 76 is guided within a guide recess of the slide guide 74. The spindle 50 moves after the mandrel pulling back to the front to the starting position. After this process, the rivet setting device 30 is again in the starting position shown in Fig. 3.

9 shows a three-dimensional view as well as individual subassemblies of rivet setting device 30.

Shown is, inter alia, a driving unit 78, the driving of the

Blind rivet 66 in the components to be interconnected by activating the above-mentioned and described in more detail below

Trigger mechanism allows.

To the drive-in unit 78, the plunger feed 52 and a rocker 80 with a spring assembly 82 are connected. The rocker 80 with the spring assembly 82 serves as a lever mechanism for opening and closing the flywheels 13 for space-saving transfer of force to the storage of the flywheels 13 to move them toward each other or move away from each other. As a result, the adjustment of a mutual axial distance between the flywheels 13 is made possible to accelerate the plunger 10 by the flywheels 13 either for rivet driving or not. A bias at least one of the flywheels 13 against the plunger 10 ensures the exercise of a sufficiently high frictional force of the flywheel or wheels 13 on the plunger 10 safely, wherein by adjusting the frictional force of the degree of

Interaction can be adjusted. By interposing a lever mechanism in the form of the rocker 80 between acting as a biasing spring spring assembly 82 and the flywheels 13, a realization of the drive mechanism is possible even under tight space conditions.

The mandrel removal unit 44 can be mounted on a mandrel tractor unit 84. The mandrel removal unit 44 is used to dispose of a residual mandrel 32 of a blind rivet 66, which remaining mandrel 32 is demolished during the setting process of the blind rivet 66 and remains within the rivet setting device 30. In this case, an undesirable jamming or tilting of the remaining mandrel 32 in a channel between a mounting location (where the blind rivet 66 is mounted before or for setting) and a residual mandrel receptacle (which can accommodate many remaining mandrels 32, which are then disposed of batchwise or in groups can) avoided. This takes place in that the channel is at least and preferably partially provided or lined with a frictional positive guidance structure, in particular an elastomer hose, along which the residual mandrel 32 is moved by means of friction tight and without Ausweichmöglichkeit along. Thus, the free mobility or the number of

Movement degrees of freedom of the remaining mandrel 32 specifically limited, thus preventing a jamming or tilting promoting sideways and / or sliding movement of the remaining mandrel 32.

The drive-in unit 78 and the mandrel unit 84 are loosely inserted into each other. On the drive-in unit 78 there are eccentric clamping levers 79, which can be transferred for clamping the drive-in unit 78 and mandrel unit 84. After tilting the clamping lever the driving unit 78 is pulled over a housing in the direction Dornzugeinheit 84. The mandrel unit 84 is thereby pressed against the housing. The driving unit 78 and the mandrel unit 84 may alternatively be coupled together in other ways, for example by means of a screw connection. A controller 86 may include a processor that controls the rivet setting operation of the rivet setting device 30. The control unit 86 is executed in the embodiment shown as a control board.

The ram repeating system 72 is based on an inelastic but flexible pulling element 21 (in particular a cord) in combination with a tensioning element 21 (not shown in FIG. 9 not shown and separate, the setting process clamping energy

receiving clamping element (in particular a tension spring). This is a low-wear ram repeating system 72 for retrieving the plunger 10 after a setting operation in a starting position for preparing a

created subsequent further setting process. The inelastic but flexible tension member 21 has favorable sliding friction properties, whereas the

Clamping element can effectively build a clamping force when the plunger 10 moves away during the setting process from its initial position. This allows the repetition of the mass of ram 10 and striker 9 over a large distance.

With the trigger 5, an unintentional and dangerous triggering a setting process can be excluded by ensuring that the setting process is triggered only if the user aware of the

Trigger mechanism actuated. The conscious triggering process takes place

According to the invention via two independent actuators 58, 60. In this case, the safety actuating element 60 is to be actuated so that the

Deduction actuator 58 is fully released to trigger the setting process, ie. a preferably mechanically acting release lock can be overcome. Separated from the trigger actuator 58 is a locking member which blocks the trigger actuator 58 until the backup actuator 60 is actuated. Will that be

Safety actuator 60 is not actuated, the user can start the drive motor by tapping the trigger actuation element 58. A release for starting the driving process takes place only when the

Backup actuator 60 has been actuated and then the

Trigger actuation element 58 is actuated a second time. FIG. 10 shows a bottom view of the setting device 30 according to FIG. 3 to

Fig. 9th

In the following, referring to FIG. 11 to FIG. 21 a triggering or removal mechanism 232 of the setting device 30 described in more detail.

Fig. 11 shows first the portion of the setting device 30, the

Triggering mechanism 232 forms.

FIGS. 12 and 13 show the triggering mechanism 232 in a locked state. The rear of the plunger 10 arranged impactor 9 is held by means of a locking pawl 214. The locking pawl 214 engages in the locked state in a designated as a locking recess 212 groove in the striker 9 a. Thus, in the illustrated locked state, the plunger 10 is not yet triggered. The spring-loaded latch pawl 214 is operatively coupled to a ram lock lever 222 which performs the function of the trip lock. Of the

Tappet locking lever 222 is as long as by a solenoid 40 as

Unlocking lock locked until the setting device 30 muzzle side, d .h. at the location of the inserted blind rivet 66, is pressed against metal sheets 62, 64 and thus a safety circuit is closed. As further shown in FIG. 12, the plunger locking lever 222 acts by means of a gate-guided lever mechanism with a release lever 208 on which a tension spring 228 is mounted, and with a tension lever 220 together. Fig. FIG. 13 further shows that the locking pawl 214 is actuated by means of a helical spring

Pawl spring 234 in the direction of the locking recess 212

is biased.

FIGS. 14 and 15 show the triggering mechanism 232 in a first embodiment

Operating condition. Prior to actuation of a trigger actuation element 58, the trigger mechanism is in the position shown in FIG. 14 and FIG. 15 position shown. A plunger slide 236 is in a rearward position and is locked via the plunger locking lever 222, which also holds the plunger 10 and the striker 9 in the rearward position. The solenoid 40 locks the

Plunger lock lever 222 and thus prevents disengagement of the plunger 10 or the impactor 9. The release lever 208 is held with the tension spring 228 in the starting position. The tensioning lever 220 is provided with a

Fed spring as a torsion spring 224 clockwise and is pressed against a stop 240. A stop angle is shown in FIG. 15 marked with reference numeral 238.

FIGS. 16 and 17 show the triggering mechanism 232 in a second operating state. If the riveting tool 30 is pressed correctly against metal sheets 62, 64 and the actuators 58, 60 are actuated, the drive spindle 50 (not shown in Figs. 16 and 17) is moved forward. The solenoid 40 is actuated (when the setting tool is pressed with inserted blind rivet 66 against metal sheets 62, 64) and unlocks the

Plunger locking lever 222. The spindle 50 additionally tows the

Push slide 236 with. As a result, the compression springs 54 are compressed, which builds up bias. The trigger lever 208, which is rotatably mounted on this, is pulled under the stop angle 238 along. It is about a curve on the trigger lever 208 of the clamping lever 220 in

Counterclockwise turned down. The leg spring 224 is thus biased and pushes over the tensioning lever 220 the release lever 208 against the stop angle 238 upwards.

Figs. 18 and 19 show the triggering mechanism 232 in a third

Operating condition.

If the spindle 50 has reached the front position, the clamping lever 220 is biased to the maximum. The trigger lever 208 was under the

Stop angle 238 pulled out. The leg spring 224 may now relax and urge the release lever 208 upward counterclockwise against the ram lock lever 222. If by this time the setting device 30 is still pressed, the plunger lock lever 222 is not locked by the solenoid 40 and thus can be pivoted, which releases the plunger 10 and the striker 9.

FIGS. 20 and 21 show the triggering mechanism 232 in yet another mode of operation. In this operating state, the release lever 208 has been rotated by the torsion spring 224 via the clamping lever 220 and has the

Tappet locking lever 222 is opened. The impactor 9 has been pushed between the flywheels 13. Once a sled hook 242 the

Plunger carriage 236 disengages, this is pulled over the tension spring 228 to the right. The trigger lever 208 is pulled up over the stop bracket 238 until it reaches the home position again.

By means of the in Fig. 3 to FIG. 21, the following operating method can be performed:

First, after a previous setting operation, a new blind rivet 66 is inserted into an opening of the rivet setting device 30, whereby this blind rivet 66 pushes a remaining mandrel 32 to a magnet holder of the mandrel removal unit 44. If no previous setting process has taken place, a first blind rivet 66 is inserted into the mouth of the rivet setting device 30.

Then the trigger actuator 58 is actuated for the first time to activate the motor 8 and the flywheels 13 in rotation and on

Operating speed to bring.

Now the rivet setting device 30 is used with blind rivet 66 to the

Pressed metal sheets 62, 64 in order to control the solenoid 40 for releasing the locking of the plunger structure 9, 10 upon successful detection of the pressing by the Anpressdetektiereinheit 46.

The user then actuates the lock actuator 60, thereby unlocking a mechanical trip lock, thus allowing the trigger actuator 58 to actuate the rivet setting operation again.

This happens, by a spindle movement and a

Lever mechanism for moving in the residual mandrel 32 further into the

Rivet setting device 30, for biasing a force acting on the plunger 10

Biasing spring, to close the flywheels 13, for transferring the

Restdorns 32 in a mandrel box, for pre-accelerating the plunger 10 and the impactor 9 by relaxing the previously biased biasing springs and finally, to further accelerate the plunger 10 by interacting with the rotating, closed flywheels 13.

The setting process is initiated by the plunger 10 on the

The blind rivet 66 inserted on the mouth side impinges on this and drives it into the metal sheets 62, 64. Excess energy of the plunger 10 is from the

Plunger brake 48 received from an elastomeric material.

Immediately after the riveting process, the flywheels 13 are returned to an open state.

The plunger structure 9, 10 is retracted by means of a ram repeating system 72 back to the starting position.

After re-pressing the Nietsetzgeräts 30 a Dornzugprozess is triggered, ie. a retraction of the driven blind rivet 66 in the direction of the setting device 30, whereby a front piece of the blind rivet 66 under

Forming a closing head in the metal plates 62, 64 remains and this holds together in a form-fitting manner, whereas a residual mandrel 32 is demolished from the front piece at the predetermined breaking point 34 and remains in the rivet setting device 30.

Now the described process can be repeated cyclically.

Fig. 22A to FIG. 22C show how the plunger 10 can be guided with the impactor 9 between the two driving flywheels 13.

Fig. 22A shows the arrangement prior to driving in a blind rivet, i. in a starting position. Fig. 22B shows the arrangement immediately after driving in the blind rivet, i. H . in a setting position. Fig. 22C shows the

Arrangement after repetition, d. H . after the return of the plunger 10, starting from the setting position shown in FIG. 22B in the starting position shown in FIG. 22A. In other words, the illustration according to FIG. 22C that of FIG. 22A.

FIG. 23 initially shows once more a representation of the rivet setting device 30 according to FIG. 3 to FIG. 21, wherein in this illustration the position of the

Stößelrepetiersystems 72 is highlighted. A first enlarged view 128 in FIG. Fig. 23 shows the ram repeating system 72 in a state in which first housing part 112 and a second housing part 114, which are both formed substantially half-shell-shaped, a clamping device 94 and a part of a tension member 21 cover or enclose. An arrow 132 in this illustration indicates in which direction the plunger 10 moves when the plunger 10 for driving a blind rivet 66 into one or more

Metal plates 62, 64 starting from its initial position in his

Setting position is transferred.

In a second enlarged view 130 according to FIG. 23, the second housing part 114 is removed, so that the internal structure of the

Stößelrepetiersystems 72 is more visible. This illustration in FIG. FIG. 23 shows that a first end portion 104 of the tensioning device 94 is rigidly supported, i. H . is immobilized on the first housing part 112. In contrast, the opposite second end portion 106 of the clamping device 94 is operatively coupled to the tension member 21 and movably mounted.

The tension member 21 extends from the first portion 96 on the

Impactor 9 by a in FIG. 23 non-visible guide roller near the speed selector switch 56, along another guide roller 20, along a first side of the coil spring 100, around another guide roller 108 at the second end portion 106 and finally along another side of the coil spring 100 back, then at the third section 110 at the first

Housing part 112 to be jammed. More precisely, the tension element 21 is rigidly mounted by means of a clamping connection between the two housing parts 112, 114, which clampingly engage the third section 110. The housing parts 112 and 114 are half-shells, the housing of the

Clamping 94 and a part of the tension element 21 are formed.

As shown in FIG. As shown in FIG. 23, the ram repeating system 72 is provided at the second portion 98 of the tension member 21 and at the second end portion 106, respectively

Clamping device 94, the guide roller 108, wherein the clamping device 94 is directly operatively coupled by means of the guide roller 108 with the tension element 21. The tension member 21 is connected to a third portion 110, d. H . a second end portion, rigidly mounted. When the plunger 10 moves in the setting direction, the inelastic, inextensible pulling element 21 is entrained. Since the latter is fixed on one side, the coil spring 100 is compressed as a result of the plunger movement, which also moves the deflection roller 108 of the coil spring compression following. If the plunger 10 has reached the set position, the spring force or the stored energy of the coil spring 100 pulls the plunger 10 back into the starting position. Consequently, the tension member 21, the coil spring 100 and the guide roller 108 return to their original positions.

Fig. 24 shows a shock repeating system 72 according to yet another embodiment of the invention. According to this embodiment, unlike the embodiment according to FIG. 23, the tension element 21 is not along the entire tensioning device 94, ie. along two sides of it, going back and forth, but only going to a first end of the

Clamping device 94 out and deflected there on a spring-mounted guide roller 108 in the return direction, d. H . deflected by 180 °. The others

Guide pulley 108 is illustratively pulley, so that at a

Plunger movement, the movement of the tension member 21 takes place over a shorter path away, whereby a space-saving design is possible.

A shaft 120 of the guide roller 108 is by a at a

Plunger movement mitbewegten portion 122 of the clamping device 94th

passed and mounted on it. An axis of rotation 124 of the deflection roller 108 is oriented perpendicular to a direction of movement 126 of the clamping device 94 during a plunger movement. The guide roller 108 is rotated at a plunger movement itself, but may alternatively be formed non-rotatably. The

Tension element 21 is guided around the deflection roller 108.

According to FIG. 24 is the coil spring 100 along part of its

Longitudinal extension of a sheath tube 102 surrounded as a compensating sleeve that suppresses natural vibration of the coil spring 100.

The in Fig. 24 shown further deflection rollers 20, 116 have each other skewed axis, d. H . close with each other an acute angle not equal to 0 ° and not equal to 90 °. As a result, the available space or volume range can be optimally utilized.

Fig. Thus, Figure 24 shows that a polyester cord as tension member 21 is unilaterally attached to the mass to be accelerated, i. Tappet 10 together with impactor 9, is attached. About a deflection system, consisting of the three pulleys 20, 116, 108 made of polyoxymethylene (POM) and designed as a floating tension spring coil spring 100, the tension member 21 by

Screw together the housing halves or housing parts 112, 114 at the end (see reference numeral 110) clamped.

If the mass of tappet 10 together with impactor 9 accelerates, it covers a long distance. In this case pulls the tension element 21 on the coil spring 100, wherein the coil spring 100 due to the pulley only a reduced distance, in particular half of the way, spans.

The advantage for achieving a long service life is the

Covering the coil spring 100 by means of the Ummantelungsröhrchens 102 to avoid strong vibrations of the coil spring 100, which could otherwise lead to premature fatigue.

In addition, the mass of the holder (that is to say of the co-moving portion 122) on the deflection roller 108 should be kept as low as possible in order to reduce impact effects, whereby the service life can also be increased.

In addition, it should be noted that "having" does not exclude other elements or steps and "a" or "an" does not exclude a multitude. "It should also be noted that features or steps described with reference to one of the above embodiments also can be used in combination with other features or steps of other embodiments described above, and reference signs in the claims are not intended to be limiting.

Claims

Patent claims

A return assembly (72) for returning a movable plunger (10) of a setting device (30) for setting a fastener (66) in an initial position, said plunger (10) when setting the fastener (66) transferred from the starting position to a set position with the return assembly (72) comprising:

a flexible inelastic tension member (21) having a first portion (96) and a second portion (98) which is directly or indirectly coupled to the plunger (10) at the first portion (96);

a tensioning device (94) which is directly or indirectly coupled to the tension element (21) at the second portion (98), so that the tensioning device (94) is displaced from the starting position into the position when the plunger (10) is transferred

Setting position in a tensioned state can be transferred, in which the tensioned tensioning device (94) by means of the tension element (21) on the plunger (10) exerts a return force for returning the plunger (10) to the starting position.

Second feedback assembly (72) according to claim 1, wherein the tension element (21) made of a plastic, in particular polyester, and / or of a metal, in particular of steel, is formed.

3. The return assembly (72) according to claim 1 or 2, wherein the tension member (21) comprises a woven or braided material.

4. feedback assembly (72) according to any one of claims 1 to 3, wherein the tension element (21) has a soul and the soul at least partially surrounding shell.

5. feedback assembly (72) according to one of claims 1 to 4, wherein the tension element (21) has a diameter (d) in a range between 1 mm and 4 mm, in particular in a range between 2 mm and 3 mm.

6. feedback assembly (72) according to any one of claims 1 to 5, wherein a local thickening of the tension element (21) on the first portion (96) in a corresponding receiving cavity of the plunger (10) or connected to the plunger (10) impactor ( 9) is positively received.

7. feedback assembly (72) according to any one of claims 1 to 6, wherein the clamping device (94) is elastic, in particular a tension spring (100) further comprises in particular a coil spring.

8. The return assembly (72) according to claim 7, wherein the tension spring (100) along at least part of its longitudinal extension of a

Protective sheath (102), in particular surrounded by a sheath tube.

9. feedback assembly (72) according to one of claims 1 to 8, wherein one end portion (104) of the clamping device (94) rigidly, in particular stationary, is mounted and the opposite other end portion (106) of

Clamping device (94) with the tension element (21), in particular movable, is coupled.

10. feedback arrangement (72) according to one of claims 1 to 9, wherein the clamping device (94) on the second portion (98) of the tension element (21) has a deflection element (108), in particular a deflection roller, wherein the tensioning device (94). is coupled by means of the deflecting element (108) with the tension element (21).

11. feedback assembly (72) according to claim 10, wherein the tension element (21) on a third portion (110) rigidly, in particular stationary, is mounted, wherein the second portion (98) between the first portion (96) and the third portion ( 110) is arranged, in particular to form a pulley.

12. feedback assembly (72) according to claim 11, wherein the tension element (21) by means of a clamping connection between two, the third portion (110) by clampingly engaging the housing parts (112, 114) is rigidly mounted on one side, which housing parts (112, 114). in particular for housing the tensioning device (94) and at least part of the tension element (21) are formed.

13. feedback arrangement (72) according to one of claims 1 to 12, comprising at least one further deflection element (20, 116), in particular at least one further deflection roller, further in particular at least two further

Deflection rollers with each other helical deflection axes, arranged along the tension element (21) for deflecting the tension element (21).

14. Setting device (30), in particular riveting, for setting a

Fastening element (66), wherein the setting device (30) has:

a movable plunger (10), which is transferred from a starting position to a setting position when setting the fastening element (66);

a drive unit (13) for driving the movable plunger (10) and for transferring the plunger (10) from the starting position to the set position, during which the plunger (10) on the fastening element (66) a setting force for setting the fastening element (66) in transmits a target object;

a return assembly (72) according to any one of claims 1 to 13 for returning the plunger (10) to the home position after setting of the fastener (66).

15. Setting arrangement, comprising:

a setting device (30) according to claim 14 for setting a

Fastening element (66);

the fastening element (66), in particular settling on or in the

Setting tool (30) mounted.

16. A method for operating a setting device (30) for setting a

Fastening element (66) by means of a movable plunger (10), wherein a flexible inelastic tension element (21) with a first portion (96) and with a second portion (98) is provided and this on the first portion (96) with the plunger ( 10) and coupled to a tensioner (94) at the second portion (98), the method comprising:

Placing the fastener (66) in a target object (62,64) by translating the plunger (10) from a home position to a set position during which the plunger (10) transmits a set force to the fastener (66);

Transferring the clamping device (94) in a tensioned state in the transfer of the plunger (10) from the starting position to the set position, so that the tensioning device (94) in the tensioned state by means of the tension element (21) on the plunger (10) has a return force for returning the plunger (10) to the starting position.