Electric machine tool

An electric machine tool for tools which operate by percussion, the electric machine tool having a machine housing;

• a rotatingly drivable work spindle seated in said machine housing;
• a tool receiver provided for receiving a tool and driven by said work spindle;
• a mechanical striking mechanism having a beater accelerated in an axial direction and actuating a shaft of the tool in the axial direction by means of blows;
• a driver unit which derives an acceleration of said beater from rotational movement, said driver unit having an axially displaceably arranged scanning member which rotates synchronously with said work spindle;
• two circular-shaped curved paths which guide said scanning member and are fixed in said housing, said circular-shaped curved paths having elevations and depressions, pointing in an axial direction of said work spindle in a direction of said scanning member, said driver unit having two spring-loaded actuators which are effective in a displacement path of said beater and act in opposite directions in respect to each other, said spring-loaded actuators being tensioned by said scanning member.

An electric machine tool for tools which operate by percussion, the electric machine tool having a machine housing;

• a rotatingly drivable work spindle seated in said machine housing;
• a tool receiver provided for receiving a tool and driven by said work spindle;
• a mechanical striking mechanism having a beater accelerated in an axial direction and actuating a shaft of the tool in the axial direction by means of blows;
• a driver unit which derives an acceleration of said beater from rotational movement, said driver unit having an axially displaceably arranged scanning member which rotates synchronously with said work spindle;
• two circular-shaped curved paths which guide said scanning member and are fixed in said housing, said circular-shaped curved paths having elevations and depressions, pointing in an axial direction of said work spindle in a direction of said scanning member, said two curved paths being formed on each one of two circular cam disks which are fixed against relative rotation coaxially with said work spindle in said machine housing, one of said cam disks being axially displaceable in said machine housing for turning said striking mechanism on and off.

An electric machine tool for tools which operate by percussion, the electric machine tool having a machine housing;

• a rotatingly drivable work spindle seated in said machine housing;
• a tool receiver provided for receiving a tool and driven by said work spindle;
• a mechanical striking mechanism having a beater accelerated in an axial direction and actuating a shaft of the tool in the axial direction by means of blows;
• a driver unit which derives an acceleration of said beater from rotational movement, said driver unit having an axially displaceably arranged scanning member which rotates synchronously with said work spindle;
• two circular-shaped curved paths which guide said scanning member and are fixed in said housing, said circular-shaped curved paths having elevations and depressions, pointing in an axial direction of said work spindle in a direction of said scanning member, said beater being placed axially displaceably into said work spindle formed as a spindle sleeve, said scanning member which is coupled with said beater projecting through an axial slit in said spindle sleeve;
• and further comprising a header which is displaceable in said spindle sleeve, is arranged between said beater and a shaft of the tool, and which for transmitting an axial tool displacement generated by a contact of the tool to said spindle sleeve is supported at its front end facing said beater on said spindle sleeve.