Abstract: The invention relates to a device for performing a machining movement with at least one rotatable planing knife, comprising: a planing knife holder fixed rotatably in a carrier with a first and a second shaft and a first and a second bearing, wherein at least the first shaft is connected fixedly to the planing knife holder and at least the first shaft is bearing mounted in the carrier; a motor fixed in the carrier; and a drive wheel which is fixed on the first shaft and coupled to the electric motor for driving the planing knife holder, wherein the second shaft is connected fixedly to the carrier and that the second bearing is arranged on the shaft inside the body of the planing knife holder.

Abstract: A device for driving a drilling and/or impacting tool including a shaft journalled in a housing so as to be rotatable, if necessary. One end of the shaft is connectable with the tool whereas the other end is accessible for an oscillatory impact body movable in the housing by a guide, a rotatable driving shaft setting and a transmission. The transmission includes a device for converting the rotary movement of the driving shaft into an oscillatory movement of a driving element which is connected through an elastic member with the impact body.

Abstract: A commutator motor specifically designed for incorporation into portable machine tools such as a hand drill includes a stator winding arranged in a machine housing, and a rotor winding including a rotor shaft with a commutator ring journalled in the housing. Electrical connection between the commutator and current supply is ensured by multiple pairs of diametrically opposed carbon brushes of opposite polarity, the brushes being supported in the machine housing such that each respective pair of brushes can be separately brought into contact with the commutator by a lever capable of engaging the respective pairs of brushes. Various holder configurations support the brushes.

Abstract: A portable belt sander includes a housing, a driving roller journalled therein, a motor with a transmission arranged in the housing for driving the roller, a control-roller journalled in a subframe movable relative to the housing and an endless sanding belt passed around the two rollers. The driving roller has a running surface whose width is materially smaller than that of the sanding belt.

Abstract: A commutator motor specifically designed for incorporation into portable machine tools such as a hand drill includes a stator winding in a machine housing, and a rotor winding including a rotor shaft with a commutator ring journalled in the housing. Electrical connection between the commutator and current supply is ensured by multiple pairs of diametrically opposed carbon brushes of opposite polarity, the brushes being supported in the machine housing such that each respective pair of brushes can be separately brought into contact with the commutator by a setting means capable of engaging the respective pairs of brushes. Various holder configurations for supporting the brushes include sliding cams.

Abstract: An apparatus such as a belt sander including spaced apart rolls and adjustable mounting means for supporting at least one roll. An endless belt is positioned around the rolls and drive means are provided for the rolls and belt. Alignment means including a belt edge engaging means are operatively connected to the roll mounting means, and a resilient force is applied to hold the engaging means against a belt edge as the belt is moved by the drive means. This causes the engaging means to follow variations in the belt edge position, and this movement is transmitted to the mounting means whereby the variations are compensated.

Abstract: A device for driving a drilling and/or impacting tool including a shaft journalled in a housing so as to be rotatable, if necessary. One end of the shaft is connectable with the tool whereas the other end is accessible for an oscillatory impact body movable in the housing by a guide, a rotatable driving shaft setting and a transmission. The transmission includes a device for converting the rotary movement of the driving shaft into an oscillatory movement of a driving element which is connected through an elastic member with the impact body.

Abstract: This invention relates to a device for driving a drilling or precussion tool having a spindle that rotates with respect to a housing. One end of the spindle is adapted to fasten to a tool piece and the other end is connected to an oscillating percussion body movable in the housing by means of a guideway. A drive shaft rotates the tool spindle into rotation or actuates the percussion body via a transmission that is provided with means for converting the rotary motion of the drive shaft into an oscillatory motion of a drive member. The drive member is connected to the precussion body through an elastic member having a non-linear spring characteristic.