Electromagnetic driving tool.

State of the art

The invention relates to a wrapping machine according to-the species of the main claim. It's been such a turning device known -at is the after breaking the plunger returned by a spring to its original position. A rubber buffer captures the returning plunger from the end of its return stroke. By this, it is disadvantageous that the stored by rubber buffers in capturing the plunger energy often the plunger as far back raises in his work towards that an affiliated driver blade the next present fastener released from the magazine and a piece transported far into the guide channel for the impact point back. Only after the push finally comes into its final position on the rubber buffers to rest. The next Einschlaghub the ram the Straight knife solves another fastener from the magazine, which comes to the top already in the guide channel fasteners. So to cause operational troubles.

A for destroying excess impact energy provided by the EU patent application 0054782 buffering system could help here eventually. This buffer system is, however, relatively complex, takes a lot of space and wears relatively quickly. This makes the replacement of the buffer element is required, for which appropriate structural preparedness and careful maintenance of the unit are also required.

ADVANTAGES OF THE INVENTION

The wrapping device according to the invention with the characterizing features of the main claim has the advantage that its air damper just the other components of the device is the same in construction and the service life. In addition, less space is required for this steamer. By combining the air damper to the check valve is an ideal duty cycle of undamped impact movement and damped return stroke is ensured.

The measures specified in the dependent claims, advantageous refinements and improvements of the main claim wrapping device are possible. Especially advantageous is the formation of the air damper is also a tappet guide. This saves additional guide members. In addition, results in the formation of a hollow cylinder in which a pot-shaped designed plunger is pushed, an ideal damping characteristic with increasing towards the end of the return stroke damping effect.

drawing

An embodiment of the subject invention is illustrated in the drawing and explained in more detail in the following description. The figure shows a longitudinal section through an inventive turning device.

Description of the embodiment

In a device housing 1 of a turning device, a coil 2 is arranged through the cylindrical interior 3 a cup-shaped plunger 4 and is guided with this firmly connected Cutters. 5 The plunger 4 superimposed additionally axially displaceable on a hollow cylinder 6. The widened foot 7 of the hollow cylinder 6 is fixedly connected to the apparatus body 1. An opening 8 is in the device housing 1 connects the interior of the hollow cylinder 6 to the outside air. On the housing inner end of the hollow cylinder 6 a valve flap 9 is mounted so that it can freely through from the outside air flowing in, the air outlet from the housing but prevented. The space around the plunger 4 around is also vented to the outside, which is shown through an opening 10 in the device housing the first A conical coil spring 11 is supported against a spring ring 12 at the end of the plunger 4 and a front pushed onto the plunger 4 disc 13 from. The abutment for this coil spring 11 is formed by a rib 14 of the apparatus housing. 1 The bottom in the drawing end of the shock blade 5 is guided in a guide channel 15th A magazine guide 16 for a fastener magazine 17 leading perpendicularly toward the duct 15th So in a known manner in each case a fastener is introduced before the driver blade 5 into the guide channel 15th

When applying a voltage pulse to the coil 2 is drawn quickly into the interior 3 of the coil by the magnetic field of the slide 4 (arrow 18). Here, the driver blade 5 is moved through the guide channel 15, resolves a fastener from the fastener magazine 17 and drives into a lying before the end of the guide channel 15 workpiece. During this movement of the plunger 4 has sucked in through the opening 8 and the interior of the hollow cylinder 6 outside air, wherein the valve flap 9, this outside air allowed to enter unhindered. The Einschlagbevegung was therefore not hindered by the air damper formed of the plunger 4 and the hollow cylinder. 6 The collapsing at the end of the voltage pulse magnetic field returns the plunger 4 again free so that it can be moved back under the action of the coil spring 11 into its initial position. The located in the interior of the plunger 4, air is slowly pressed through a gap formed between the plunger 4 and the hollow cylinder 6 choke gap 19 because now the interior of the hollow cylinder 6 closes the valve flap 9 unhindered escape of the air does not permit to the outside. The return movement in the direction of an arrow 20 takes place steamed and prevents rebounding of the slide 4 of its bearing surface at the bottom 7 of the hollow cylinder 6. For a proper function of the impact device is ensured.