Abstract: In a region limiting excavation control system for a construction machine, a region where a front attachment (1A) is movable is set beforehand. A control unit (9) calculates the position and posture of the front attachment based on signals from angle sensors (8a-8c), calculates a target speed vector (Vc) of the front attachment based on signals from control lever units (4a, 4b), and modifies the target speed vector such that the target speed vector is maintained as it is when the front attachment is within the set region but not near the boundary thereof. A vector component (Vcy) of the target speed vector in the direction toward the boundary of the set region is reduced when the front attachment is within the set region near the boundary thereof, and the front attachment is returned to the set region and when the front attachment is outside the set region. As a result, the excavation within a limited region can be implemented efficiently and smoothly.

Abstract: In an area limiting excavation control system for construction machines such as hydraulic excavators, excavation is smoothly and efficiently carried out within a limited area by setting an area beforehand where a front attachment (1A) is movable, calculating the position and posture of the front-attachment (1A) by a control unit (9) based on signals from angle sensors (8a) to (8c), calculating a limit value of the component of the boom-dependent bucket tip speed vertical to the boundary of the set area so that when the front attachment is inside the set area near the boundary thereof, the moving speed of the front attachment in the direction vertical to the boundary of the set area is restricted, and when the front attachment is outside the set area, it is returned to the set area, and modifying a boom operation signal so as to prevent the boom-dependent bucket tip speed from exceeding the limit value.

Abstract: In an excavation area limiting control system for a construction machine for limitingly controlling an area to be excavated, a region where a front device 1A is movable is set beforehand. The position and posture of the front device are calculated based on signals from angle sensors 8a-8c, and a target speed vector of the front device is calculated based on detection signals from control lever units and load pressures detected by pressure sensors 270a to 271b. The target speed vector is modified so that a vector component of the target speed vector in the direction toward the boundary of the set region is reduced when the front device is within the set region near the boundary thereof, and the front device is returned to the set region when the front device is outside the set region. Control signals corresponding to the modified target speed vector are further modified depending on the load pressures and output to proportional solenoid valves 210a to 211b.

Abstract: A dot printer device is disclosed, in which in order to print a horizontal ruled line, paper feed data for placing the head pin of a printing head at a predetermined position on a printing paper, dot pin data indicative of a dot pin specified on the basis of a predetermined rotation of dot pins for printing the horizontal ruled line, and paper feed data indicative of how much the printing paper is to be moved in accordance with the predetermined rotation of dot pins after the horizontal ruled line has been printed by the specified dot pin, are sent from a control unit to a printing unit.