A power transmission mechanism includes: a first pulley driven about a first axis; a second pulley rotatable about a second axis, separated from and parallel to the first axis; and a third pulley rotatable about a third axis parallel to the first axis and between the first axis and the second axis. The third pulley is configured such that a large-diameter pulley having a larger diameter than the first pulley and a small-diameter pulley having a smaller diameter than the second pulley are coaxially fixed to each other. A first belt is looped between the first pulley and the large-diameter pulley. A second belt is looped between the small-diameter pulley and the second pulley. The third pulley is supported such that a position is adjustable, along a first plane orthogonal to the third axis, in a direction intersecting a second plane including the first axis and the second axis.

A camera assembly includes a motor configured to generate a driving power; a motor shaft that extends from the motor, such as to define a first axis, and is configured to rotate by the driving power of the motor; a pulley configured to rotate on a second axis, that is spaced from the first axis, according to rotation of the motor shaft; a belt configured to couple the motor shaft and the pulley, and convert the rotation of the motor shaft to rotation of the pulley, and tension of the belt applies a force to the motor shaft in a direction towards the second axis; a camera module configured to be mounted on the pulley and rotate together with the pulley; and an elastic body configured to apply a biasing force to the motor shaft such as to bias the motor shaft in a direction away from the second axis.

A robot includes a power source and a power transmission mechanism configured to transmit an output of the power source. The power transmission mechanism includes a fixed member, a first pulley configured to rotate around a first axis with respect to the fixed member, a second pulley disposed to be separated from the first pulley and configured to rotate, with respect to the fixed member, around a second axis parallel to the first axis, a belt wound around the first pulley and the second pulley and configured to transmit the rotation of one of the first pulley and the second pulley to another, a restricting member including a restricting section disposed to be opposed to the belt with a gap in a portion where the first pulley and the belt mesh with each other, and a screw having a center axis along the first axis and configured to fix the restricting member to the fixed member. The restricting member rotates around the center axis to thereby change a separation distance between the restricting section and the belt in a plan view from a direction extending along the first axis.

A method of operating a chain drive that includes sprockets. Tensile chain moments on the sprockets are determined and a specification value for operating the chain drive is determined therefrom in an automated manner. A corresponding assembly has a chain drive with sprockets and with a control device at least partly associated with the chain drive. The control device is configured for carrying out the method and a specification value for load distribution among the two drives for operating the chain drive is determined therefrom in an automated manner.

A method of operating a chain drive that includes sprockets. Tensile chain moments on the sprockets are determined and a specification value for operating the chain drive is determined therefrom in an automated manner. A corresponding assembly has a chain drive with sprockets and with a control device at least partly associated with the chain drive. The control device is configured for carrying out the method and a specification value for load distribution among the two drives for operating the chain drive is determined therefrom in an automated manner.

The present invention relates to a portable power tool (1) arranged for driving a rotatable cutting tool (2). The power tool (1) comprises a motor (5) and a transmission part (4) that is arranged to transfer power from the motor (5) to a tool holder (10), and comprises a first arm part (11; 11′) and a second arm part (12; 12′). The first arm part (11; 11′) comprises a first belt pulley (13) and the second arm part comprises a second belt pulley (14), the arm parts (11, 12; 11′, 12′) being slidably connected to each other. The belt pulleys (13, 14) are spaced apart by a certain distance (d-i, d2). The transmission part (4) further comprises a tensioning device (20) with a rod (21), a pre-tensioned resilient device (22), a linkage arrangement (25) and a rotatable part (26). The rotatable part (26) is rotatable between a first, released, state where the belt pulleys (13, 14) are spaced apart by a first distance (d-i), and a second, tightened, state where the belt pulleys (13,14) are spaced apart by a second distance (d2) that exceeds the first distance (d-i), the resilient device (22) being more compressed in the second state than in the first state.

A contact guard for a belt drive, in which a filling space formed between two pulleys and the belt is filled by a filling body, which includes two sub-bodies that can be moved relative to one another.

A contact guard for a belt drive, in which a filling space formed between two pulleys and the belt is filled by a filling body, which includes two sub-bodies that can be moved relative to one another.

A quick-release automatic tensioning motor base for supporting a motor. The motor is operably coupled to a device to be driven via a drive belt. The motor base includes at least two base brackets and at least one guide rail fixedly coupled between the base brackets. A platform assembly, which supports the motor, is slidably coupled to the guide rail for movement there along. A spring assembly is selectively coupled between the base brackets and fixedly coupled to the platform assembly. The spring assembly applies a biasing force to the platform assembly to maintain a belt tension along the drive belt. A quick-release assembly selectively engages the spring assembly and the at least two base brackets to permit movement of the quick-release assembly between a first position to retain the spring assembly and a second position to release the spring assembly to permit movement of the platform assembly.

A quick-release automatic tensioning motor base for supporting a motor. The motor is operably coupled to a device to be driven via a drive belt. The motor base includes at least two base brackets and at least one guide rail fixedly coupled between the base brackets. A platform assembly, which supports the motor, is slidably coupled to the guide rail for movement there along. A spring assembly is selectively coupled between the base brackets and fixedly coupled to the platform assembly. The spring assembly applies a biasing force to the platform assembly to maintain a belt tension along the drive belt. A quick-release assembly selectively engages the spring assembly and the at least two base brackets to permit movement of the quick-release assembly between a first position to retain the spring assembly and a second position to release the spring assembly to permit movement of the platform assembly.