Abstract: A rack bar and a method for production thereof. The rack bar is composed of a steel pipe (10) and an embedded metal core (14) placed therein. The steel pipe has rack teeth formed thereon by forging. The embedded metal core (14) is made of a metal softer than the steel pipe (10) and has its surface wave-shaped such that the bottom (20) is wide and the top (22) is narrow.

Abstract: Disclosed herein are a rack bar and a method for production thereof. The rack bar is composed of a steel pipe (10) and an embedded metal core (14) placed therein. The steel pipe has rack teeth formed thereon by forging. The embedded metal core (14) is made of a metal softer than the steel pipe (10) and has its surface wave-shaped such that the bottom (20) is wide and the top (22) is narrow.

Abstract: A method of manufacturing a part with a tooth profile by cold forging includes an initial step of forming a initial tooth profile and a finishing step of forming a completed tooth profile by sizing. Between the initial step and the finishing step, is an intermediate step tooth thickness of the initial tooth profile is either maintained or reduced by 10% or less from the tooth thickness of the initial tooth profile. In the intermediate step an addendum part is expanded beyond the initial tooth profile by cold forging.

Abstract: A method of manufacturing a tooth profile part by cold forging comprising: an initial step of forming a initial tooth profile: a completing step of forming a completed tooth profile by sizing: between the initial step and the completing step, maintaining a tooth thickness of the initial tooth profile identical to a tooth thickness of the initial tooth profile or reducing a tooth thickness within a range of 10% or less compared to a tooth thickness of the initial tooth profile, and at the same time including an intermediate step of ejecting an addendum part over the initial tooth profile by cold forging.

Abstract: A failure-data storage system is disclosed which is able to prepare data accumulated from a multiple data bit device test. Failure-data from the memory tester 1 is, before being stored in memory IC 6, logically added to one previous cycle failure-data with the same address by OR gate 12, and the result is input to F/F 13. The output of the F/F 13 is input to memory IC 6 when 3 state buffer 14 is in an enabled state and is fed back to the OR gate 12. Furthermore, each of the data bit of memory IC has data controller 10-1, 10-2, 10-3, and 10-4 as explained above.

Abstract: An address generating circuit for data compression includes an X-address generating circuit (10), a Y-address generating circuit (20), an XY-address generation control circuit (30) and a defect analyzing memory (40). Each of the circuits (10) and (20) include a flip-flop (3A), a selector (2), an upcounter (4), an adder (5), a down-counter (6) and a comparator (1). The control circuit (30) receives address end signals J and address carry signals L from the circuits (10) and (20) to control the circuits (10) and (20). The memory (40) has address signals K from the circuits (10) and (20). Processing time required to check defects of a large capacity memory device is reduced because address generators are provided not only on the X-address side but also on the Y-address side and the compression ratio is set in the address generating circuit, thereby accelerating the defect analysis.

Abstract: A physical image converting circuit is used in a memory tester for or an integrated circuit tester analyzing the failure of storage devices to be measured, in which data are read as logical images from each of the corresponding storage regions to each input/output bit and are stored in each of the corresponding storage regions to each input/output bit of a failure analysis memory used for failure analysis. The physical image converting circuit converts the logical image of the readout data from the failure analysis memory into physical images so that the readout data corresponds to a physical position on a wafer chip of the failure analysis memory. The physical image converting circuit includes a counter, an address converting circuit, a failure analysis memory, and a selector. The counter generates increment addresses corresponding to at least a storage capacity of failure analysis memory.

Abstract: A supporting structure for rocker arms for engine valves includes an engine having a cylinder head, a valve provided on the cylinder head and adapted for either of intake and exhaust purposes, a valve-operating mechanism for operating the valve, the valve-operating mechanism including a rocker arm abutting on the top of the valve, to thereby operate the valve, and a pivotal structure for pivotably supporting one end of the rocker arm. The pivotal structure comprises a ball-like portion, a spherical concave portion shaped in a form substantially correspondent to the ball-like portion and engaged with the ball-like portion, and an elastic member disposed at an aperture end of the spherical concave portion and adapted to hold the ball-like portion in the spherical concave portion.