| 摘要 |
<p>The invention relates to a percussion device, e.g. in .the form of an engraving pen, which comprises a housing (1) and two bodies (3, 4) being movable to and from, viz. an impact body (3) for an impact pin (5) protruding from the housing, and a second body or balancing body (4) having the purpose of counterbalancing the impact motions of the impact body so as to anti-vibrate the device in its entirety. In the housing there are also springs (16, 17), which constantly strive to bring the bodies towards each other and against the action of which the bodies may be separated axially. The balancing body (4), but not the impact body (3), is rotatable, more specifically by means of a drive spindle (7) connected to a driving source (9) said spindle being mounted in a bearing member (10), at least one of the bodies including an oblique surface (14, 15), which, by contact against the other body, transforms the rotary motion of the balancing body (4) into axial motions of the impact body. According to the invention, rotation of the bearing member (10) is prevented by means of a helical pressure spring (16) that is attached to the bearing member (10) as well as the housing (1). In this way, tangential vibrations cannot be transferred from the drive spindle to the housing.</p> |
