Abstract: Disclosed is an ink jet printer in which the temperature detecting circuit 8 is arranged between the thermistor 3 mounted on the ink jet head 2 and the flexible cable 7 for transmitting the signal output from the thermistor 3 to the CPU 30, and the analog signal, which is the voltage value corresponding to the temperature of the ink jet head 2, from the thermistor 3 is converted into the pulse signal (digital signal) by the temperature detecting circuit 8, the digital signal being output to the CPU 30 through the flexible cable 7, thereby the drive voltage of the ink jet head 2 is controlled according to the viscosity change of the ink occurring by the temperature change of the ink jet head 2 itself or the circumstance surrounding the ink jet head 2, by detecting the temperature of the ink jet head 2 through the thermistor 3.

Abstract: A voltage output based on the resistance, which is determined by how a contact member on an adjusting lever is connected to a resistance member on the side of a carriage, is detected as a head gap. The cap advancing/retracing distance during capping operation by a capping mechanism is adjusted according to the detected head gap. Consequently, the capping operation of the cap to hermetically cover a nozzle surface of a print head is performed effectively.

Abstract: In an ink jet recording device selectively operable in an auxiliary ejection mode and a printing mode, dual ejection signal generators are provided. In the auxiliary ejection mode, a carriage is moved to face a flush station and ink droplets are auxiliary ejected from the nozzles in accordance with ejection signals produced by a CPU. Ejection signals for use in the printing mode are produced from an encoder signal which is the output from a photo-interrupter provided in the carriage.

Abstract: In a technique of monitoring whether a physical system is normal or abnormal by continuously comparing a phenomenon taking place in the system and a phenomenon taking place in a model and also in a technique of control adopting evaluation functions using an error quantity in the model, the phenomena in both the physical system and model can be optimized. An equivalent electric circuit to the physical system is produced, and an input is provided to both of the system and the circuit. In this state, the output of the physical system and the reference value of the equivalent electric circuit are compared. The use of the equivalent electric circuit permits solving the problem inherent in the prior art that the time necessary for analog-to-digital conversion and numerical calculations is longer than the time of the actual phenomenon and disables real time simulation.

Abstract: An ink jetting device having plural ink channels whose volume is variable in accordance with deformation of piezoelectric elements, and a controller that applies a voltage to the piezoelectric elements and includes at least two timing generating circuits that oscillate timing signals for ink jetting with a time lag for a period that is shorter than the period from the time when the voltage is applied to the piezoelectric elements until the time when the voltage application is stopped, and a driving circuit that is provided in correspondence with each ink channel and serves to latch a signal representing whether ink jetting is performed and apply the voltage to the piezoelectric elements on the basis of the latched signal when receiving the signals from the timing generating circuits.

Abstract: It is difficult to use in combination a technique of detecting a collision of an arm due to application thereto of an external force and a technique of alleviating the degree of impact of the arm by covering the arm with a cushioning material. This is so because if it is intended to alleviate the impact degree, the timing of detection of the generation of the collision is delayed. The disclosed technique is to overcome the relation of the opposing factors by using a visco-elastic material. Particularly, by selecting the viscosity coefficient and the elasticity coefficient of the material in predetermined ranges, it is possible to alleviate the impact degree without excessive delay of the impact detection timing and forcibly stop the arm before the force acting between the arm and the object exceeds a permissible level.

Abstract: A dual ink jet head has an actuator formed from a piezoelectric material that has side A and side B formed with a plurality of ink channels in total. To eject ink droplets from the nozzles in both side A and side B of the actuator using a single power source, electrode pairs for selected ink channels in side A are connected to the single power source and the remaining electrode pairs for non-selected ink channels in side A are disconnected from the single power source, and electrode pairs for selected ink channels in side B are disconnected from the single power source and the remaining electrode pairs for non-selected ink channels in side B are connected to the single power source. By so driving the actuator, ink droplets are ejected from the nozzles corresponding to the selected electrode pairs in both side A and side B.

Abstract: A filter includes a case, filtering material housed within the case, a cover which covers the open end of the case and is non-rotatable relative to the case, and an annular fastener clamping the cover to the case. The case includes a large-diameter portion at an open end of the case, the large-diameter portion including a convexity forming an engagement tab. The cover has a concavity into which the convexity is received to prevent the cover from rotating relative to the case. Moreover, the cover includes a screw thread on the outer periphery thereof. The annular fastener has a screw thread on the inner periphery thereof mated with the screw thread on the outer periphery of the cover. On the other hand, the annular fastener has a small-diameter portion engaged with the large-diameter portion of the case by which engagement and mating of the screw threads the annular fastener secures the cover to the case.

Abstract: A vehicle seat comprising a horizontal seat cushion, a support shaft projecting upward from the seat cushion, and a rotatable backrest secured on the support shaft. The vehicle seat further comprises a mechanism for regulating the rotational movement of the backrest, which can be controlled in response to a detected driving state of the vehicle. The backrest may be immovably retained at a normal position relative to the seat cushion during the usual forward driving, and allowed to rotate to a suitable position during a stop, reverse, or cornering of the vehicle.

Abstract: A device for moving up and down and tilting a headrest of a vehicle seat having a driven shaft for moving the headrest up and down and a support member for tilting the headrest. The drive shaft is operatively connected to leg members fixed to the headrest, and provided in a backrest of the vehicle seat. The support member is provided below the driven shaft. A drive mechanism drives the driven shaft to move the headrest up and down relative to the backrest, and a tilting mechanism rotates the leg members about the support member to tilt the headrest to a back of the seat backrest.

Abstract: A control method of the invention is formed with the steps of when a margin angle .gamma. reaches a given minimum margin angle .gamma.min during the operation of a rectifier and inverter, a shunt reactor is disconnected from, or a shunt capacitor is connected to, an AC line of the inverter, and when the margin angle .gamma. exceeds the minimum margin angle .gamma.min by a predetermined value, the shunt reactor is connected to, or the shunt capacitor is disconnected from, the AC line.

Abstract: Control units are provided associative with forward and inverse converters in a multiterminal DC power transmission system, respectively. The control units set different constant voltages in the converters. Further, the minimum value of the constant voltage set values in the forward converters is set at a value larger than the maximum value of the constant voltage set values in the inverse converters.

Abstract: A semiconductor circuit comprising a reactor including a closed magnetic path core of a compression molding which is formed of a mixture of an insulating material and particles of magnetic substance and a conductor magnetically interlinking to the core, and a semiconductor element connected in series with the reactor.