A purpose is to improve storability of a plurality of connection pieces coupled bendably. A robot arm mechanism includes a revolute joint and a linear extension and retraction joint. The linear extension and retraction joint includes a plurality of first connection pieces coupled bendably and provided with a hollow square cross section and a plurality of second connection pieces coupled bendably and each shaped like a flat plate. The second connection pieces are overlapped on the first connection pieces in upper part of the first connection pieces, thereby forming a columnar body by constraining bending. The columnar body is released when the first connection pieces and the second connection pieces are separated from each other. An ejection section forms the columnar body by joining the first connection pieces to the second connection pieces and supports the columnar body. The plurality of first connection pieces are coupled at an upper part and a lower part of each piece to be folded in a zigzag pattern and stored in a base with top faces of adjacent first connection pieces folded on top of each other and bottom faces of adjacent first connection pieces folded on top of each other alternately.

A purpose is to improve movement characteristics of a linear extension and retraction mechanism. A robot arm mechanism includes a revolute joint and a linear extension and retraction joint. The linear extension and retraction joint includes a plurality of first connection pieces coupled together bendably on a bottom plate side and provided with a U-shaped cross section, and a plurality of second connection pieces coupled together bendably and each shaped like a flat plate. A foremost one of the plurality of second connection pieces is connected with a foremost one of the plurality of first connection pieces. The first and second connection pieces, when overlapped each other, form a columnar body by being constrained from bending. The columnar body is relaxed when the first and second connection pieces are separated from each other. An ejection section forms the columnar body by joining together the first and second connection pieces and supports the columnar body. A linear gear is formed on a surface of a bottom plate of each of the first connection pieces. A drive gear is engaged with the linear gears of the first connection pieces overlapped to the second connection pieces in the ejection section.

A linear extension and retraction mechanism includes a plurality of first connection pieces coupled together bendably; and a plurality of second connection pieces coupled together bendably, wherein back faces of the first connection pieces and back faces of the second connection pieces are overlapped each other, thereby generally forming a columnar body by constraining bending, and the columnar body is relaxed when the first and second connection pieces are separated from each other, the linear extension and retraction mechanism further including an ejection section adapted to support the columnar body.

The invention relates to an actuator mechanism for adjusting at least one angular position of a mirror element in an exterior mirror device for a motor vehicle. The actuator mechanism comprises a base element and a mirror element movably coupled with the base element, which comprises a mirror support for supporting a mirror surface. The mirror element is rotatable relative to the base element about at least a first pivoting axis with the aid of a first electric motor provided in the actuator mechanism, which extends in a longitudinal direction that is substantially transverse to a supporting surface of the mirror support. What can be elegantly facilitated by this, for instance also in the case of a relatively small mirror surface that is only a few centimeters wide and/or is only a few centimeters long, is that, as seen from a direction in which during use the mirror surface is being viewed by a driver, such electric motor does not protrude, or hardly protrudes, next to, above and/or below the mirror surface.

The invention relates to an actuator mechanism for adjusting at least one angular position of a mirror element in an exterior mirror device for a motor vehicle. The actuator mechanism comprises a base element and a mirror element movably coupled with the base element, which comprises a mirror support for supporting a mirror surface. The mirror element is rotatable relative to the base element about at least a first pivoting axis with the aid of a first electric motor provided in the actuator mechanism, which extends in a longitudinal direction that is substantially transverse to a supporting surface of the mirror support. What can be elegantly facilitated by this, for instance also in the case of a relatively small mirror surface that is only a few centimeters wide and/or is only a few centimeters long, is that, as seen from a direction in which during use the mirror surface is being viewed by a driver, such electric motor does not protrude, or hardly protrudes, next to, above and/or below the mirror surface.

A device for rotating a toothed wheel, including a linear piezoelectric motor including: a passive element having an elongated shape, a piezoelectric actuator capable of axially moving the passive element in a bidirectional manner, a transmission member fastened to the passive element, meshing with a toothing of the wheel in such a way as to rotate the wheel by one tooth in a first direction of rotation when the passive element is moved axially in a first direction of movement, a jumper mobile between two end positions, including a lowered position in which it blocks a rotation of the wheel in a second direction of rotation opposite to the first direction of rotation.

A device for rotating a toothed wheel, including a linear piezoelectric motor including: a passive element having an elongated shape, a piezoelectric actuator capable of axially moving the passive element in a bidirectional manner, a transmission member fastened to the passive element, meshing with a toothing of the wheel in such a way as to rotate the wheel by one tooth in a first direction of rotation when the passive element is moved axially in a first direction of movement, a jumper mobile between two end positions, including a lowered position in which it blocks a rotation of the wheel in a second direction of rotation opposite to the first direction of rotation.

An apparatus and method according to which a fluid, such as a fracturing fluid, is pressurized. The apparatus includes a motor that produces a first rotational output including a first angular velocity, a pump operably coupled to the motor, the pump comprising a fluid end and a power end operably coupled to the fluid end, and a transmission operably coupled between the motor and the pump. The transmission receives the first rotational output as a first rotational input, the first rotational input including the first angular velocity, and converts the first rotational input into a second rotational output, the second rotational output including a second angular velocity. The power end receives the second rotational output as a second rotational input, the second rotational input including the second angular velocity. In some embodiments, the transmission is directly connected to, or part of, the pump and the motor.

A cutter blade moving mechanism moves a cutter blade to a forward position by a low output drive motor without an urging member urging the cutter blade to the forward position where media is cut. The first cutter blade moving mechanism has a drive gear that moves the first cutter blade forward and back; a drive motor; and a compound gear to which rotation of the drive motor is transferred. The intermittent teeth part of the compound gear meshes with a transfer gear after turning the compound gear is started by drive power from the drive motor, completing a rotation transfer path. Because there is a delay between when driving the drive motor starts and when the path transferring rotation from the drive motor to the drive gear is completed, rotational kinetic energy is stored in the compound gear during this delay. The transfer gear can therefore be turned with greater drive power (rotational kinetic energy) when the compound gear and transfer gear mesh.

An adapter assembly for operably connecting an end effector to a surgical instrument. The adapter assembly includes a first proximal shaft, a second proximal shaft, a first distal shaft, and a second distal shaft. The first proximal shaft includes a first gear assembly. The second proximal shaft defines a longitudinal axis and includes a second gear assembly. The first distal shaft is disposed along the longitudinal axis and includes a third gear assembly. The first gear assembly is mechanically engaged with the third gear assembly. The second distal shaft includes a fourth gear assembly. The second gear assembly is mechanically engaged with the fourth gear assembly. A distal portion of the second distal shaft is disposed at least partially within an internal cavity of the third gear assembly.