Abstract: A stator (1) is made up by bonding a first stator part (1a) made of a high-permeability material to a second stator part (1b) made of a high-permeability material respectively by welding through the intermediary of connections (1c, 1d) made of a low-permeability material or a nonmagnetic material, interposed therebetween. Paired recesses (5a, 5b) serving as holding torque setting means for holding a rotor (3) by a magnetic action are formed on the inner periphery of a rotor hole (2) defined inside the stator (1) at the position forming an initial phase angle (&thgr;1). A field coil (7) for excitation is magnetically bonded to opposite ends of the stator (1), thereby forming a two-pole step motor for a timepiece.

Abstract: A stator (1) is made up by bonding a first stator part (1a) made of a high-permeability material to a second stator part (1b) made of a high-permeability material respectively by welding through the intermediary of connections (1c, 1d) made of a low-permeability material or a nonmagnetic material, interposed therebetween. Paired recesses (5a, 5b) serving as holding torque setting means for holding a rotor (3) by a magnetic action are formed on the inner periphery of a rotor hole (2) defined inside the stator (1) at the position forming an initial phase angle (&thgr;1). A field coil (7) for excitation is magnetically bonded to opposite ends of the stator (1), thereby forming a two-pole step motor for a timepiece.

Abstract: A stator (1) is made up by bonding a first stator part (1a) made of a high-permeability material to a second stator part (1b) made of a high-permeability material respectively by welding through the intermediary of connections (1c,1d) made of a low-permeability material or a nonmagnetic material, interposed therebetween. Paired recesses (5a, 5b) serving as holding torque setting means for holding a rotor (3) by a magnetic action are formed on the inner, periphery of a rotor hole (2) defined inside the stator (1) at the position forming an initial phase angle (&thgr;1).

Abstract: A pair of parallel rectangular windows are punched out in a thin sheet base material having the same thickness as that of a short hand part (13) including a weight part (13a) of a second hand (10) so as to form a hand forming part between the pair of windows and a part in the hand forming part forming a long hand part and a mounting part of a hand is pressed so as to form a thin wall part. Then, the second hand in a final shape is punched out from the base material so that a long hand part (11) and a mounting part (12) are formed with the thin wall part of the hand forming part and the short hand part (13) is formed with an original thickness part. Consequently, the second hand for an analog electronic timepiece in which the weight part (13a) is provided on the short hand part (13) can be easily and securely manufactured only by a press working.

Abstract: In an analog electronic timepiece in which the rotation of a rotor (1a) step motor (1) is decelerated through train wheels before it is transmitted an hour hand (17) and a minute hand (15), the gravity center of a center wheel composed of a center wheel gear (9), a center wheel pinion (10), and a center wheel shaft (11) to which the minute hand (15) is mounted is displaced from the axis of the center wheel shaft (11) to within an angle range of less than ±90° with respect to the opposite direction to a direction in which a time indicating part (15a) of the minute hand (15) extends so as to reduce a moment on the center wheel shaft (11) caused by a combination of the minute hand (15) and the center wheel. This makes it possible to prevent a hand-skip due to disturbance even if the value of holding energy of the step motor (1) is reduced.

Abstract: The present invention provides a floppy disk drive which can removably receive a cartridge containing a floppy disk and which can travel a READ/WRITE head to the desired track on the floppy disk while rotating the floppy disk at a constant speed for effecting the desired read/write action under an electric-magnetic conversion. The drive is of a top-up type which includes a frame portion and a carrier which can be popped up from the frame portion. The frame portion includes a spindle motor for directly driving the floppy disk, a plurality of positioning pins for positioning the disk cartridge relative to the spindle motor, and a carriage carrying the READ/WRITE head for travelling the head to the desired track on the disk. The carrier is pivotably supported by the frame portion and adapted to receive the disk cartridge. The cartridge can be loaded into the lower portion of the carrier upon popping-up of the carrier.

Abstract: A carriage device used for moving and positioning a magnetic head opposite prescribed tracks of a magnetic disk has the magnetic head mounted on a carriage which has linear motor mechanisms built integrally therein. The linear motor mechanisms incorporate coils secured to part of the carriage and permanent magnets secured aorund the coils. Guide rails serving to support the carriage within the range of the sliding motion of the coils are made of a magnetic substance.

Abstract: The present invention provides a micro stepping motor for more accurately stepping and positioning a magnetic head in a magnetic disc system. The stepping motor has a permanent magnet type rotor and a stator encircling the rotor, the rotor having a plurality of pole teeth formed therein with a fine pitch and the stator also having a plurality of pole teeth formed therein with a fine pitch and disposed opposed to the pole teeth in the rotor, the stator pole teeth being divided into at least one pair of pole tooth groups which are out of phase relative to each other by an electrical angle of 180 degrees. A single common stator coil is provided to the pair of stator pole tooth groups. Thus, the stepping pitch of the rotor is determined by the pitch in the pole tooth groups, whereby the rotor can steppingly be driven with higher density even by the reduced number of stator coils.

Abstract: In a circuit for driving a pulse motor of an electronic timepiece, the initial part or entirety of each drive pulse is modulated to form a group of high frequency pulses thereby reducing an initial surge of current while rotor of motor is still stationary. Modulation can be controlled according to load placed on motor to provide increased drive energy for heavy loading.

Abstract: In an electronic timepiece having a stepping motor which drives time indicating means, a system is provided for detecting an increase in the load torque on the stepping motor above a predetermined level. When such an increase is detected, the conditions for detection of the load on the stepping motor are changed, and thereafter drive pulses of increased power are applied to the stepping motor. When the increased load is removed, this is detected under the new set of detection conditions, and a return to the original detection conditions is executed, with the drive pulse power being returned to the original level. Stability of control is thereby provided, together with immediate response to increased load on the stepping motor.

Abstract: An electronic timepiece having a reversible stepping motor to actuate time-indicating hands to provide a time display, which comprises a driver circuit to produce driving current pulses composed of compound pulses appearing each time unit. A rotor of the stepping motor rotates a plurality of steps during each time unit to cause one of the time-indicating hands to advance through unequal intervals to provide a modulated display.

Abstract: An electronic timepiece including a battery, a drive motor, a drive, a display, and electronic circuits for driving said motor. The motor is a pulse motor and comprises a core, coil, yoke and rotor. The rotor includes a worm gear having worm teeth which engage with a gear wheel. The teeth on the worm gear are arranged and configured such that the initial and final portions of each tooth which engage with the gear wheel are parallel to the plane of rotation of the rotor thereby preventing torque applied to the gear wheel from being transmitted to the rotor.

Abstract: An electro-mechanical transducer driver circuit for an electronic timepiece characterized in that the pulse width of a driving pulse which drives an electro-mechanical transducer is controlled in a step-wise manner by the induced voltage of a driving coil.

Abstract: An electronic timepiece includes a reversible stepping motor to drive rotatable hands to provide a time display. In a first preferred embodiment, the electronic timepiece includes a circuit means to generate alternating current pulses having an increased pulse width or an increased amplitude to drive the stepping motor with an increased driving current during high speed time correction when a manually operable external control member is actuated during time correction.

Abstract: A pulse motor for clockworks and the like in which the rotor comprises two spaced-apart permanent magnetic disks mounted upon a common shaft and rotatable with respect to a stator. The stator comprises a respective pair of magnetic poles in the plane of each disk, the poles of the pair being interconnected by a shank and a coil wound upon the respective shanks, the coils lying on opposite sides of the rotor. The coils can be excited independently to cause the respective pair of poles to magnetically cooperate with the respective disk and rotate the motor in the forward or the reverse sense.

Abstract: An electronic timepiece having a reversible stepping motor to actuate time-indicating hands to provide a time display, which comprises a driver circuit to produce driving current pulses composed of compound pulses appearing each time unit. A rotor of the stepping motor rotates a plurality of steps during each time unit to cause one of the time-indicating hands to advance through unequal intervals to provide a modulated display.

Abstract: A stepping motor for use in an electronic timepiece in which a rotor is stable on an axis of static equilibrium at an angle from 0.degree. to 30.degree. with respect to a center line of the air gaps between stator pole pieces. The relationship between the stator pole pieces and the rotor is such that the phase difference between driving torque and attraction force applied to the rotor ranges from 60.degree. to 90.degree. by an electrical angle in a normal rotation of the rotor and ranges from 90.degree. to 120.degree. in a reverse rotation of the rotor.

Abstract: A stepping motor for an electronic timepiece comprises a permanent magnet rotor, a stator and a driving coil, having at least one static equilibrium point for the rotor. The driving coil is arranged to be energized by a current smaller than a driving current so that the stator is energized to required polarities of low flux intensity, whereby the static equilibrium point for the rotor is electromagnetically shifted to an arbitrary position to permit rotation of the rotor in any desired direction.

Abstract: A stepping motor for use in an electronic timepiece which has a permanent magnet rotor and a stator provided with a driving coil. The stator is comprised of stator pole pieces each having assymetric portions which provide primary and secondary magnetic paths, respectively, whereby two static equilibrium positions are provided. The rotor may be stable at either one of these static equilibrium positions by controlling the supply of two-phase pulses to the driving coil so that the rotor may be rotated in normal or reverse direction. SuThis invention relates in general to stepping motors and, more particularly, to a reversible stepping motor for use in an electronic timepiece.As is well known, stepping motors, also called pulse motors, are becoming increasing employed in industrial applications due to the introduction of digital pulse techniques. Typical one of these applications involves electronic timepieces having electro-mechanical timekeeping movements which are driven by the stepping motors.

Abstract: A reversible pulse-motor driving circuit comprising a steady driving circuit composed of an oscillator circuit, a frequency divider circuit, a waveform conversion circuit, and a driving circuit, and a fast correction driving-circuit composed of a fast correction set-circuit, a first gate circuit, a detector circuit, a normal and reverse discrimination circuit, a conversion change-over circuit, a pulse selector circuit, a first memory circuit, a second gate circuit and a second memory circuit, whereby a user can hear a time signal delivered from a calculation circuit and only push a pushbutton to rotate the pulse motor in a reverse direction when the second hand is ahead of the correct time, and rotate the pulse motor in a forward direction when the second hand is lagging with respect to the correct time, and the use of a frequency higher than the steady driving frequency permits a fast setting of the second, minute or hour hand to the correct time.