摘要:
Disclosed is feeding apparatus comprising a first vibration apparatus having projections provided with a predetermined distance therebetween, the first vibration apparatus producing a first travelling vibration wave in response to an electrical signal applied thereto, and a second vibration apparatus having projections located at the positions substantially corresponding to the projections of the first vibration apparatus, the second vibration apparatus producing a second travelling vibration wave proceeding in the same direction as the first travelling vibration wave in response to an electrical signal supplied thereto thereby the sheet inserted between the projections of the first vibration apparatus and the projections of the second vibration apparatus being fed by the first and second travelling vibration waves.
摘要:
There is disclosed a sheet feeding device having at least two vibration members pinching a sheet, which is frictionally driven by the travelling vibration waves generated in the vibration members. The device is further provided with a detector for detecting the state of vibration of the vibration members and generating a signal corresponding to the phase difference between the vibrations. The signal is used for correcting the vibration state of the vibrations members, thus significantly reducing the unevenness in the sheet feeding.
摘要:
An improved sheet feeding device of this invention includes a variable pressure applying unit for changing a contact pressure between a sheet and vibration members.
摘要:
There is disclosed a sheet feeding device having a vibration member for generating vibration for feeding a sheet member. The vibration member is in frictional engagement with the sheet member, which is fed by vibration generated in the vibration member. The device further has a member for controlling the amplitude of the vibration of the vibration member according to the feeding speed of the sheet member whereby the sheet can be fed with a desired speed.
摘要:
An encoder includes a scale member provided on one of two bodies which are relatively rotated and have gratings arranged in a relative rotating direction and a light irradiator for irradiating a first region with beams. A diffracted image of the first region is projected on a second region of the scale member. The encoder further includes a detector for detecting the beams from the second region. The relative rotation of the other body is detected based on a detected result thereof. A scale whose relative rotation to a rotation detecting device is detected by being irradiated with the beams from the encoder. The scale includes a base member formed with a grating having surfaces inclined to incident beams. In addition, a driving system causes relative rotation between the two bodies. This system includes a device for relatively rotationally driving the two bodies and a controller for controlling a driving condition of the driving device. A motor unit includes a motor module having rotation of its body detected by a result of a light irradiator and rotary shaft provided with a scale member. This unit further includes a supporting device for integrally supporting the body, the light irradiator and the detector.
摘要:
The present invention has been devised in order to raise driving efficiency of the vibration wave driving apparatus. A vibration member of a vibration wave driving apparatus of the present invention comprises the vibration member constituted of an elastic member and an electro-mechanical energy conversion element, and a rotor contacting the vibration member, and the vibration member generates a travelling wave in the elastic member when an alternating signal is applied to the electro-mechanical energy conversion element, in which an electrode film provided on a surface of the electro-mechanical energy conversion element of the vibration member is divided into a plurality of circular areas with different radiuses and each circular area is divided into a plurality of electrodes along its peripheral direction.
摘要:
There is provided a position control apparatus and method for a table member which is capable of controlling the positioning of the table through very small displacement thereof, to thereby prevent the position of the table from deviating even when a disturbance such as vibration is applied to the table. A table member is movable relative to the base member in a predetermined direction. A threaded shaft is rotatably mounted on a base member and elastically deformable when twisted. A motor is coupled to one end of the threaded shaft, for rotating the threaded shaft to displace the table member. A pressurizing and fixing member is arranged in the vicinity of a location where the motor is coupled to the threaded shaft, for pressurizing the threaded shaft to be fixed in position.
摘要:
A positioning device according to the present invention includes a movable body; a position detection unit detecting a position of the movable body; a first and a second vibratory actuator controlled in accordance with a detection output from the position detection unit; a first transmission mechanism comprising a first gear wheel and a first rack engaging the first gear wheel, the first transmission mechanism transmitting a driving force of the first vibratory actuator to the movable body; and a second transmission mechanism comprising a second gear wheel and a second rack engaging the second gear wheel, the second transmission mechanism transmitting a driving force of the second vibratory actuator to the movable body. An engaging position of the first gear wheel with the first rack is different from an engaging position of the second gear wheel with the second rack.
摘要:
The distal end of a flange of a stator serving as a contact member is located on the outer peripheral side of one linear portion of an elastic member serving as a vibration member, and the inner peripheral side of this linear portion of the elastic member is located on the proximal side of the flange. The ratio of the response amplitude of the flange of the stator to the amplitude of the elastic member is kept almost constant in all areas of contact portions between the two members.
摘要:
The present invention relates to a vibration wave motor which is configured to prevent abnormal noise from being produced at a start time or a stop time and, more particularly, to a control device for a vibration wave motor which obtains a driving force by applying a periodic voltage to an electro-mechanical energy conversion element so as to generate in a vibration member thereof a plurality of standing waves having a phase difference therebetween, the plurality of standing waves being synthesized to generate a driving vibration in the vibration member. The control device comprises a frequency control circuit which varies a frequency of the periodic voltage and, when a driving force of the vibration wave motor is to be stopped, varies the periodic voltage so as to achieve a predetermined frequency at which a rotational speed of the vibration wave motor becomes zero, and a voltage control circuit which gradually lowers a voltage level of the periodic voltage to a predetermined voltage and then, after the frequency control circuit varies the frequency so as to achieve the predetermined frequency, stops energization of the vibration wave motor.