Abstract: A device for tape recorder comprises a head mounting plate to which a magnetic head is secured, and a head support plate formed with a notch which is adapted to receive the mounting plate therein for permitting an adjustment of the elevation of the mounting plate relative to the support plate, and for minimizing the space occupied by the head and its mounting assembly.

Abstract: A method of recording an index signal in a dictating tape recorder of the type in which a single button is utilized to switch the recorder to each of a stop, a playback, a record and a tape rewind position. The method comprises moving the button beyond the record position to close a switch which actuates an oscillator for generating an index signal. The signal output from the oscillator is applied to a record head, thereby recording the index signal on a magnetic tape.

Abstract: A change-over switch for a printed circuit board comprises an electrically conductive, resilient wire which is disposed in the manner of a torsion spring, on an electrically conductive support stud which in turn, is secured on an insulating substrate so as to be in electrical contact with a patterned electrical circuit printed thereon. The wire has a pair of limbs which are formed as movable electrical contacts and which are biased by the resilience of the wire material to move in opposite directions along a path on which are disposed a pair of stationary contacts in the form of studs secured to the substrate in electrical contact with other portions of the patterned electrical circuit. An operating member either constrains or permits a movement of the resilient wire under its bias, thus operating the movable contacts into and out of engagement with the stationary contacts.

Abstract: A tape end warning apparatus comprises an alarm switch which is closed in response to the detection of a terminal end of a running tape being reached during a record or playback operation of a tape recorder, and an oscillator circuit which is activated by the closure of the switch. The oscillator circuit produces an alarm signal which is fed to an amplifier inherently contained in a tape recorder so as to give off an audible alarm through a loudspeaker which is connected with the amplifier.

Abstract: A liquid feeder comprises a liquid suction and delivery pump which withdraws a liquid such as a culture solution, buffer solution, enzyme solution or the like which is retained in a liquid storage container as refrigerated or at a reduced temperature and delivers it through a flexible tube for injection into a culture vessel located within an incubator. The tube is inserted into an inner pipe and is sealingly secured thereto. The inner pipe is detachably and hermetically mounted in an outer pipe which extends through and is secured to a wall forming an environment isolating layer of the incubator. An eccentric crankpin which is driven by a motor is connected through a link with another crankpin having a greater eccentricity, the latter crankpin being driven for rotation to cause a reciprocatory rotating motion of a driven shaft about its own axis through an angular extent of less than 180.degree..

Abstract: An automatic microfilm retrieval system for retrieving contents of a dictionary or the like recorded on a microfilm and displaying them on a screen is disclosed. Said microfilm includes a retrieval cord and divided into a plurality of unit regions to be displayed on said screen at the same time and further includes a cord added to each of said unit regions and representing an index word whose contents are included in each of said unit regions. A plurality of said unit regions are assembled into a plurality of groups. To each of said groups are added cords representing first and last index words included in each of said groups. Provision is made of a subtracter which functions to compare said cords read out by a reading head with key inputs obtained by depressing keys provided on a key board and control movements of a movable stage holding said microfilm thereon, thereby retrieving said microfilm.

Abstract: A telephone recording device comprises a recording head provided in a movable member moved in accordance with taking up and down of a handset of a telephone, the recording head being set on the recording side when the handset is removed and being reset when the handset is replaced.

Abstract: An electrically driven film rewind apparatus for a camera comprises a film rewind motor, drive gearing driven by the motor for rotating a film rewind shaft, clutch means in the drive gearing for operatively connecting and disconnecting the film rewind shaft with or from the motor, and clutch control means including means for maintaining the clutch means in its operative position during a film rewind operation in which the clutch means is effective to operatively connect the film rewind shaft with the motor and for automatically causing the clutch means to be disconnected from the film rewind shaft from the motor immediately upon termination of a film rewind operation.

Abstract: A device for pressing down a document to be duplicated on a document table of an electrophotographic apparatus comprises a flexible cover which is journaled along its one edge portion and a supporting frame which supports the document cover in an opened or upright position. Near the free end of the document cover there is secured a handle or grip which engages with the supporting frame. In case of duplicating a thick document such as a book the handle can be disengaged from the frame and the thick document can be effectively pressed down on the table by means of the document cover. The document cover and the frame are detachably arranged at positions which are lower than the surface level of the document table. Documents larger than the document table can be easily duplicated by removing the document cover and the supporting frame.

Abstract: In a camera including a taking lens which is moved in the direction of its optical axis in response to an adjustment of a distance adjusting member and also including a lens protecting cover which is movable between a first position in which it covers the front of the taking lens and a second position in which the lens is exposed, a mechanism for retracting the taking lens into the camera by rotating the distance adjusting member comprises a linkage which includes a drive member adapted to be angularly driven by the cover as the latter moves to its first position, and a connecting member which couples the drive member with the distance adjusting member.

Abstract: A rotor is manufactured by disposing a commutator integral with a rotary shaft centrally within a casting jig, arranging a rotor coil around the commutator, and integrally molding the assembly in synthetic resin. The rotor coil comprises a coil wound on a bobbin formed with positioning openings. Guide pins are provided within the jig in the region of the rotor coil for fitting engagement with the positioning openings in the latter. When molding the rotor, the rotor coil is properly positioned as a result of the engagement between the guide pins and the mating openings, assuring the molding of a balanced rotor.

Abstract: A motor brush for use in a miniature motor comprises a coil spring having both end portions extended to the outside, a contact member secured to the one end portion of the coil spring and biased to contact with a commutator by spring force, a stop member provided at a support member in a motor case for stopping the other end portion of the coil spring, and a column body secured to the support member for supporting the coil spring.

Abstract: An automatic switching device for a cassette tape recorder is provided which includes a detecting member disposed within the tape recorder for cooperation with at least one detection opening provided in a tape cassette so as to indicate the variety of a magnetic tape internally housed therein, thereby establishing an optimum bias and/or an optimum tape speed for the tape recorder.

Abstract: A volume controlled tape and alarm for a tape recorder is disclosed. The tape end alarm is coupled between a microphone and an audio amplifier and includes an automatic gain control circuit for maintaining a constant recording level, an oscillator for generating an audio frequency signal, and a variable volume control resistor for coupling the output of the oscillator circuit to the automatic gain control circuit. The volume of the audio alarm signal can be adjusted by adjusting the position of an externally adjustable knob connected to the variable resistor.

Abstract: A tape recorder comprises an operating device including a tape feed switching member which is provided with an abutment surface adapted for engagement with a playback actuating member to prevent the switching member from being locked in a review position when the playback actuating member is in its playback position, brake means including a braking member responsive to each of a record actuating member, a rapid tape advance actuating member or a tape rewind actuating member for applying a braking action upon a tape supply shaft, and an ejector including a cover opening and cassette ejecting member which is responsive to an operation of a magnetic head carrying member for performing the opening of a cover of a tape cassette receiving chamber and the ejection of a tape cassette therefrom in two steps. The provision of the operating device in the manner mentioned above prevents the tape feed switching member from being locked in a review position when a review operation is desired during a playback operation.

Abstract: A wet developing stationary electrode for wet-developing an electrostatic latent image produced on a record sheet. The electrode is provided at that surface thereof which is opposed to the electrostatic latent image produced surface of the record sheet with a number of strip-shape electrodes acting as developing electrodes and extending along two directions symmetrically inclined with respect to the advancing direction of the record sheet, the rear ends of the strip-shaped electrodes, viewed in the advancing direction of the record sheet, being divergent toward the front ends thereof.

Abstract: A coupling device comprises a pair of coupling channels formed in the both lateral sides of a compact cassette tape recorder, and a pair of rails formed on a part of a radio set for engagement with the channels, allowing the cassette tape recorder to be detachably coupled with the radio set. When not coupled, apertures provided in the tape recorder for connection terminals are covered by a coverplate, which uncovers these apertures by a sliding movement as the tape recorder is coupled with the radio set, thus enabling an electrical connection with the latter. The compact tape recorder can be detachably coupled with an accessory unit such as a tuner, a microphone pre-amplifier or the like by a single mounting threaded stud.

Abstract: A tape recorder apparatus comprises a tape recorder internally housing a power source and a pause switch for controlling a drive system, and an adaptor including connecting elements for coupling with the tape recorder without the use of an electrical cord, and a switch for controlling the operation of the tape recorder. The aforesaid switch and a pause switch are connected in parallel with each other across the power source. When the adaptor is connected with the tape recorder, the pause switch is turned off, whereby only the drive system of the tape recorder is controlled by the first mentioned switch.