Fastener guiding device for power tools

p0001The present invention relates to a fastener feeding device for a powered tacker said in the preamble of claim 1.

p0002Fastener feeding machines powered fastener driving tools, such. As screwdrivers, have to be attached to a substrate, a head part which serves the leadership of fasteners, such. As screws before and during the driving operation. This header can be part of a fastener magazine or a fixing agent transport device, for. Example, which can be fitted to a flange of a driving tool.

p0003From the <patcit id="pcit0001" dnum="DE20309492U1"><text>DE 203 09 492 U1</text></patcit> is a screw device with Schraubenzuführeinrichtung known, wherein a first assembly is arranged in a holder on a housing flange of the screw driving tool. A second unit of Schraubenzuführeinrichtung in the form of a screw guide slidably disposed relative to the first unit of this and is with her lying in the direction of the end of a workpiece be attached. At the second module a hub is mounted to which a ratchet is arranged. The ratchet has an arm which projects from the turntable and carries at its opposite end a fixing pin. This passes through a first arcuate sliding opening of a transmission block and extends through a slide in the bracket. If the screw guide is pressed in a pressing of screwing on a workpiece in the holder, then the fixing pin is moved along the slide, wherein the ratchet is rotated by the arcuate setting opening of the gear block. The screws are transported through the screw guide and supplied the screwdriver.

p0004The disadvantage here is the arrangement of the guide slot disposed arcuate a hub and extending substantially transversely to a plane defined by the screwdriver working axis, which is unfavorable to the kinematics of the transport mechanism and forces jamming with pollution of the guide mechanism. Furthermore, a high, to be applied by the user, pressing force for the screw conveyor is necessary here to the start of the Anpressweges.

p0005From the <patcit id="pcit0002" dnum="DE2541046A1"><text>DE 25 41 046 A1</text></patcit> is a device for screwing in screws, in which a slider is mounted displaceably in a housing. In the slider, a device for stepwise transportation of screws into a Einschraubstellung disposed. The transport device in this case has a on the slider rotatably mounted sprocket with two sprocket disks and a clutch disk. The clutch plate has lugs, which are engaged in corresponding recesses in the transom plate and held there under spring load. On the clutch disc further comprises a pin is arranged which is guided both in a guide slot on the housing as well as in a slot in the slider. In a pressing of the front part of the slider to a workpiece, the pin and the clutch plate connected to it is rotated by forced guidance in the slots in the clockwise direction, whereby the coil strip moves and a screw of the Einschraubstellung is supplied. With a lifting of the slider from the surface of the pin is moved in the opposite direction, a lock prevents rotation of the sprocket disks counterclockwise. The clutch disc with the approaches couples therefore made against the force of a spring and is moved back alone counterclockwise to the original position.

p0006The disadvantage here is also that at the beginning of Anpressweges high, applied by the user, pressing force of the screw conveyor is necessary. The transport mechanism is vulnerable to contamination and consequent failures.

p0007The <patcit id="pcit0003" dnum="DE4219095C1"><text>DE 42 19 095 C1</text></patcit> proposes to simplify a feed device with a sprocket for driving tool to store the sprocket at one end of a first arm of a two-armed pivoted lever, while the control pin is arranged on its second arm. The two-armed pivot lever is mounted on a pivot bearing, which is disposed between the first and the second arm. When pressing of a stopper of the slider to a workpiece, the pivot lever is pivoted by the forced operation of the control shaft in the clockwise direction and takes the sprocket with. The sprocket wheel is secured with a locking mechanism so that it can not rotate but transported the screw strips. If you lift the drive-in tool from the workpiece, the slider via a spring again moved out of the housing whereby the force-guided pin the pivot lever now pivoted counterclockwise, the rungs of the sprocket wheel but still engage in marginal recesses of the screw strip.

p0008A disadvantage of this feeding device, the pivoting lever sensitive to contamination that can lead to an impairment of its function.

p0009The object of the present invention is to provide a fastener feeding device for a power operated driving tool available which avoids the disadvantages mentioned, which is of simple construction and which enables a reliable transport of the screw strip.

p0010This object according to the invention is achieved by the measures specified in claim. 1

p0011Accordingly, the transport means includes a displaceably guided on the second module via guide means sliding element, at the head part end region facing the axis of rotation with the transport wheel and at the other end portion of the actuator is mounted. The slide element is preferably guided in a curved path. If pressing the drive-in tool to an underground transport wheel is moved with the slider element in the transport direction of the strip, there is no danger of jamming in the presence of contaminants in the lead of the slide element. This measure therefore a technically simple design, easy to prepare and reliably operating transport mechanism is provided.

p0012Advantageously, the guide means of the transport device at least one first and one second guide curve at the second module on, are performed in which the first and second control pin formed guiding means of the slide element, wherein the guide curves a, defined in the direction through the driving channel, working axis are spaced from one another and wherein the guide curves one end, which is the working axis closer and an end, which is the working axis further comprise. By this measure, a separate guide of the front and the rear part of the slide element is achieved. The resulting by the guide curves virtual axis of rotation which is relevant to the transport, is located outside the housing and varies its position, so that the necessary contact pressure for the strip of transport depending on the pressing path can be optimized. Also, the motion can be optimally matched to the strip transport.

p0013It is advantageous furthermore, if the first control pin is formed coaxially with the actuating member and the second control pin is concentric with the axis of rotation of the transport wheel. Hereby, a compact construction can be achieved. The first control pin lies in an initial position of the transport means, preferably where the working axis near the end of the first guide curve, while the second control pin is in the initial position at which the working axis distal end of the second guide curve, whereby a defined starting position of the slide element is achieved.

p0014It is also favorable when the first guide curve having a curvature which is starting to work axis far end bent from the work axis near the end of the working axis away, while the second guide curve having a curvature, starting from the far the working axis end to the working axis proximal end bent to the working axis towards. This leads of the head portion facing front part of the slide element another curve movement than its rear part, whereby the resistance of the transport device is raised against tilting at a return movement.

p0015Advantageously, the transport wheel two mutually spaced along the rotational axis sprout wheels, both of which each have a separate ratchet mechanism. By this measure, the scion of wheels can be controlled separately.

p0016Conveniently, the first sprocket wheel, a return means associated with said first ratchet mechanism is formed between the return means and the first sprocket and said return means is controlled by control means on the transporting device to enable rolling of the transporting wheel on the magazine strip only in the return direction of the transporting device. In this way, an additional locking means for locking the magazine strip is no longer necessary, whereby a cost reduction is achieved. The magazine strip is thus defined at any time held by the transport wheel. In a structurally simple solution to this variant, the control means include at least one control track to the second module and at least one is arranged on a control panel control section that runs in the control link. The spring means of the first ratchet mechanism are set on the control panel.

p0017Additional advantages and objects of the invention result from the dependent claims, the following description and the drawings. In the drawings the invention is shown in one embodiment.

p0018Show it:<dl id="dl0001"><dt>Fig. 1</dt><dd>a fastener feed device to a driving tool in side view,</dd><dt>FIG. 2</dt><dd>a detail of the fastener-feeding device of Fig. 1 in exploded view;</dd><dt>Fig. 3</dt><dd>a further detail of the fastener-feeding device of Fig. 1 in exploded view;</dd><dt>Fig. 4</dt><dd>a sectional view of the fastener-feeding device of Fig. 1 with the fastener-feeding device in its starting position,</dd><dt>Fig. 5</dt><dd>a section view of the fastener-feeding device according to Fig. 2, with the fastener-feeding device in a partly pressed against position a substrate,</dd><dt>Fig. 6</dt><dd>a sectional view of the fastener-feeding device according to Fig. 2 with the fastener-feeding device in a fully pressed against a substrate position.</dd></dl>

p0019Figures 1 to 6 show a generally designated 10 according to the invention, fastener-feeding which is a coupling portion 14 80 releasably secured to a flange 81 of an only indicated in Figure 1, power-operated hand-held tacker. The reproduced tacker 80 is designed as an electrically operated screw device.

p0020The fastener supply device 10 is designed as a screw magazine with an integrated transport device 30 for transporting a magazine strip 50th In the fastener feed means 10 embodied as a screwing tool driving tool driving channel 15 is guided in a 12, which is drehbetätigtbar via the power-operated driving tool 80th About the transport device 30, in a switching step when pressing the tacker 80 to a substrate U a fastener 51 are moved into the driving channel 12 before the driving tool 15 so that fastener 51 can be driven below about the driving tool 15 into the underground metro. The driving channel 12 defines a working axis A of the fastener feeding 10th

p0021The fastener supply device 10 includes a first assembly 11, which includes the coupling portion 14 and which is designed here as a guide housing, and a second assembly 21 which is held displaceably on the first unit 11 and against the first unit 11 via an elastic return element 17 is supported on. The second unit 21 is constructed as a sliding carriage and comprises guide portions 23, which are axially displaceably guided in guides 13 on the first unit eleventh The second unit 21 also carries the transport device 30 and leads the magazine strip 50 with the fasteners 51 in a strip guide 20. The second unit 21 has a head part 22, which can be attached to a substrate U with a face 24th The head part 22 is spaced from a support 29 which comprises two lateral support elements 25, between which a slide element 31 of the transport device 30 is mounted displaceably, in particular in FIG. 3 is visible. The distance of the head part 22 to the carrier 29 is adjustable by means of a mechanism not shown in the figures, to use fastening means 51 of different lengths.

p0022Such as in particular the figures 2 to 6 it can be seen, the pusher element 31 of the conveyor 30, a curved or bent shape and carries at a first end or end portion 38 facing the coupling portion 14, two first guide pin 36. These first control pin 36 are slidably mounted in a recess 47, where they support each other elastically via a spring element 42nd The first control pin 36 pass through respective first guide curves 26, where they are guided for displacement. The control pin 36 form the receiver 47 at their ends facing away from a respective actuator 35, each of which is engaged in a guide cam 16 on the first assembly 11 and slidably guided therein.

p0023Where, the first end 38 opposite second end region 39 or the end of the slide member 31 is a transport wheel 32 is supported on an axis of rotation D, which is guided in a bearing bush 49th At the two opposite ends of the axis of rotation D second control pin 37 are formed, which are each guided in the second guide curves 27 of the carrier 29 at the second assembly 21 slidably.

p0024The first guide curve 26 has a curvature, which, starting from one of the working axis A proximal end 61, which is the head portion away 22, far to the working axis A end 62, which faces the head part 22, bent towards the working axis A away , while the second guide curve 27 has a curvature, which, starting from one of the working axis a distal end 71, which is the head portion away 22 to a work axis a proximal end 72, which faces the head part 22, towards the working axis a is bent (see. in particular figures 2, 4, 5 and 6). This particular arrangement of the guiding curves 26, 27 reliably prevents tilting of the over the guide curves 26, 27 and the control pins 36, 37 guided slide element 31st

p0025The transport wheel 32 shown in detail in Figure 3 includes a first sprocket 33 and second sprocket 34 and a cooperating with the first sprocket 33 return means 40. Each of the two rung wheels 33, 34 is a respective ratchet mechanism 43, 44 associated with the respective spring means 45 , 46 includes. At the Pinwheels 33, 34 arranged rungs 53 engage in one located in a strip guide 20 to the second unit 21 magazine strip 50 in it provides transport apertures.

p0026The return means 40 comprises a control plate 41 on which a control member 48 is formed in the form of a pin. This control member 48 engages in a control slot 28 of a carrier element 29 of the support 25 of the second assembly 21 is a (see FIGS. 2 to 6).

p0027In the initial position of the fastener-feeding device 10 shown in Figures 1 and 4, the second unit 21 from the first unit 11 is under the force of the return element 17, which, for. Example, is formed as a spiral spring, the maximum distance moved out. The first control pin 36 abut against the first ends 61 of the first guide curves 26, while the second control pin 37 abut against the first ends 71 ​​of the second guide curves 27th The transport wheel 32 engages with its rungs 53 in the transport holes on the magazine strip 50 in the strip guide 20 at.

p0028If the driving tool 40 is pressed with the fastening means arranged thereon supply means 10 to a base U, as shown in FIG. 5 can be seen, then the second assembly 21 is moved into the first assembly 11 in the direction of the arrow 82. Due to this movement, the actuators 35 run in the first portions 18 of the control paths 16 in a direction away from the work axis A. The associated with the actuators 35 control pin 36 are thereby in the direction of arrow 83 on the second end 62 of the first cam 26 to move and rear first end portion 38 of the slider element 31 thus moves from the working axis A away. The front second end portion 39 of the slider element 31 is controlled by the second control pin 37 in the second guide curves 27 separately and moved in the direction of the working axis A through this in the direction of arrow 84, wherein the second control pin 37 toward the second end 72 of the second guide curves 27 move toward. The transport wheel 32 with the two Pinwheels 33, 34 is moved by this movement also in the direction of arrow 84 to the working axis A towards. The second sprocket wheel 34 is via the second ratchet mechanism 44 and the spring means 46 is locked, so that the magazine strip 50 is then transported via the non-rotatable transport wheel 32 in the direction of arrow 52nd

p0029In FIG. 6 of the magazine strip 50 has already been moved by the transport unit 30 around an entire switching step so that a fastener 51 has been moved into the driving channel 12 and then driven through the driving tool 15 into the ground U. The slide element 31 with the transport wheel 32 has been in the manner described above while moving until the first and second control pins 36, 37 which have reached each of the second ends 62, 72 of the guiding curves 26, 27th The actuators 35 ran here, after reaching the end position of the slide element 31 in the second portions 19 of the cam 16 continues, extending in the direction of the working axis A.

p0030After completion of the driving-in or screwing-in a lifting of the fastener driving tool 80 and the fastener feeding means 10 from the substrate U, the second assembly 21 is pushed back under the force of the return element 17 of the first unit 11 out, whereby the actuating members 35 initially in the second portions 19 of the cam run 16th Once the actuation members 35 run in the first portions 18 of the cam 16, the first and second control pins 36, 37 in the first and second guide curves 26, 27 opposite to the direction of the arrows 83, 84 back from the second ends 62, 72 of the first and second guide curves 26, 27 are moved to their first ends 61, 71 down. The slide element 31 with the transport wheel 32 is thereby moved in respective directions. In this return movement the transport wheel 32 rolls running onto the magazine strip 50th The rolling is in this case controlled by the return means 40, the control member 48 is guided in the control slot 28th The control plate 41 of the return means 40 is locked thereto during the return movement of the slide member 31 through the first ratchet mechanism 43 and the spring means 45 at the first sprocket 33rd The second sprocket 34 rotates with it and überratscht a position. The conveyor 30 and the fastener supply means 10 are now back in their starting position. Through the active roles of the transport wheel 32 on the magazine strip 50 need this not to be additionally secured with a locking device in place.