Abstract: The invention provides a disk reproducing device capable of automatically detecting dirt on a lens without using any additional members. A pickup unit 5 reads a video signal of a storage medium 2, comparison/judgment means 9a compares an attenuation ratio of an RF signal B amplified by an RF amplifier section 8 to a standard RF signal A stored in a storage section 12 with a threshold P likewise stored in the storage section 12 and judges that there is dirt on a pickup lens 51 when the comparison value falls below the threshold P, and a display section 11 displays alarm message data 122 stored in the storage section 12 superimposed on images being reproduced, and it is possible to thereby automatically detect dirt on the pickup lens 51 and report it to the user.

Abstract: This invention provides with a continuous underground trench excavating method and an excavator for the method, which performs vertical excavation in which a trencher of the excavator is inserted into the ground and horizontal excavation in which a travel body of the excavator is moved substantially horizontally, characterized in that it determines a penetration resistance under penetration of the trencher to a predetermined depth, estimates a ground strength in the underground depth direction on the basis of the penetration resistance, and a continuous underground trench excavating is carried out with a thrust matching the estimated ground strength, whereby capable of carrying out an appropriate excavation with better understanding of the ground condition.

Abstract: A tape transport apparatus enabling a tape winding to be completed even if a winding load is applied to interrupt the tape running during a fast-forward running mode or rewinding running mode. An output voltage applied to a drive motor driving a supply reel or a take-up reel is set at a high voltage during a fast-forward running mode or rewinding running mode and a load flag is turned ON. When a rotation number of the drive motor is reduced under a predetermined rotation number due to the occurrence of the winding load during the load flag being ON, the output voltage applied to the drive motor is sifted from a high voltage to a low voltage and the drive motor is continuously driven to rewind the tape.

Abstract: This invention provides with a continuous underground trench excavating method and an excavator for the method, which performs vertical excavation in which a trencher of the excavator is inserted into the ground and horizontal excavation in which a travel body of the excavator is moved substantially horizontally, characterized in that it determines a penetration resistance under penetration of the trencher to a predetermined depth, estimates a ground strength in the underground depth direction on the basis of the penetration resistance, and a continuous underground trench excavating is carried out with a thrust matching the estimated ground strength, whereby capable of carrying out an appropriate excavation with better understanding of the ground condition.

Abstract: In a high-speed tape winding operation of a magnetic recording and reproducing apparatus, stable tape-stopping operation without generating any damages of the tape. In addition to the mechanical braking means, a reverse braking force is applied to a drive motor for rotating reels depending on the tape conditions so as to diminish the rotation inertia of the drive motor and dispense with a strict operation timing and precision of the mechanical braking means.

Abstract: A tape transport apparatus enabling a tape winding to be completed even if a winding load is applied to interrupt the tape running during a fast-forward running mode or rewinding running mode. An output voltage applied to a drive motor driving a supply reel or a take-up reel is set at a high voltage during a fast-forward running mode or rewinding running mode and a load flag is turned ON. When a rotation number of the drive motor is reduced under a predetermined rotation number due to the occurrence of the winding load during the load flag being ON, the output voltage applied to the drive motor is sifted from a high voltage to a low voltage and the drive motor is continuously driven to rewind the tape.

Abstract: In a high-speed tape winding operation of a magnetic recording and reproducing apparatus, stable tape-stopping operation without generating any damages of the tape. In addition to the mechanical braking means, a reverse braking force is applied to a drive motor for rotating reels depending on the tape conditions so as to diminish the rotation inertia of the drive motor and dispense with a strict operation timing and precision of the mechanical braking means.

Abstract: An underground continuous wall building method and apparatus in which a chain cutter 2 provided with excavation blades is obliquely mounted on a running carriage 1. Slanting continuous trenches G1, G2 are excavated by moving the running carriage 1 in a transverse direction while rotating the cutter 2 with the cutter 2 obliquely placed in the ground, and a water cutoff material is poured into the excavated continuous trenches G1, G2 and solidified therein to build slanting continuous walls R1, R2 in the ground.

Abstract: A closure to be applied to a container for holding a liquid such as shampoo. The closure comprises a closure body, a discharge liquid tube extending through the closure body and a reciprocating air pump mechanism built in the closure body. The air pump mechanism includes a cylinder whose discharge side communicates with the inside of the container and whose intake side communicates externally of the container, a piston, and a spring for elastically biasing the piston toward the intake side. The piston has a rod whose free end portion extends outwardly of the closure body.

Abstract: A closure for containers comprises an automatic opening-closing mechanism and an outside closure member having a pour opening. The automatic opening-closing mechanism includes a plug member having a centrally formed air introduction hole and a plurality of liquid discharge ports formed around the air introduction hole, a first valve member for opening and closing the liquid discharge ports and a second valve member for opening and closing the air introduction hole.