Abstract: A punch unit for a press die is provided for punching a hole in sheet metal. The punch unit includes a piercing punch provided with a sharp projection, a plunger for pressing the piercing punch, a cylinder for supporting the piercing punch and the plunger slidably in a punching direction, and a coil spring for retracting the piercing punch and the plunger. Also disclosed is a press die for punching a hole in sheet metal using the punch unit.

Abstract: A sheet metal punching apparatus 1 includes an upper die holder 2 which is raised and lowered by a hydraulic ram and the like; a pressing plate 3 secured to the upper die holder 2; a pressing pad 5 suspended from the upper die holder 2 through a resilient member 4; a punch holder 7 secured to the pressing pad 5 by means of a bolt 6 and the like and constructed as a punch unit; a lower die 9 on which a sheet metal 8 to be subjected to punching is placed; and a die 11 embedded in the lower die 9 and having a though hole 10 of an oval shape conforming to the shape of a through hole to be punched in the sheet metal 8.

Abstract: A punch unit for a press die for punching a hole in sheet metal includes: a piercing punch provided with a sharp projection; a plunger for pressing the piercing punch; a cylinder for supporting the piercing punch and the plunger slidably in a punching direction; and a coil spring for retracting the piercing punch and the plunger. Also disclosed are a press die for punching a hole in sheet metal and a punching method using the punch unit.

Abstract: A sheet metal punching apparatus 1 includes: an upper die holder 2 which is raised and lowered by a hydraulic ram and the like; a pressing plate 3 secured to the upper die holder 2; a pressing pad 5 suspended from the upper die holder 2 through a resilient member 4; a punch holder 7 secured to the pressing pad 5; a lower die 9 on which sheet metal 8 to be subjected to punching is placed; and a die 10 embedded in the lower die 9.

Abstract: A sheet metal punching apparatus 1 includes an upper die holder 2 which is raised and lowered by a hydraulic ram and the like; a pressing plate 3 secured to the upper die holder 2; a pressing pad 5 suspended from the upper die holder 2 through a resilient member 4; a punch holder 7 constructed as a punch unit secured to the pressing pad 5 by means of a bolt 6 and the like; a lower die 9 on which thin sheet metal 8 to be subjected to punching is placed; and a die 10 embedded in the lower die 9.

Abstract: A method of and system for displaying high-density bit-mapped dot-matrix imaging data on a large-scale low-density dot-matrix display is disclosed. Bit-mapped image data from each of multiple and adjacently oriented dot image data groups is allocated to drive one dot of the aforesaid display. This is done through a process in which a data selection sequence standard is employed to alternately select and extract image data from each of the aforesaid dot image data groups continually and repetitively at high speed, and in which the extracted image data from each dot image group is applied to drive one dot on the display.

Abstract: An apparatus 1 for punching sheet metal includes an upper die holder 2 which is raised and lowered by a hydraulic ram and the like; a pressing plate 3 secured to the upper die holder 2; a pressing pad 5 suspended from the upper die holder 2 through a resilient member 4; a punch holder 7 constructed as a punch unit secured to the pressing pad 5 by means of a bolt 6 and the like; a lower die 9 on which sheet metal 8 to be subjected to punching is placed; and a die 10 embedded in the lower die 9.

Abstract: A method of and system for displaying high-density bit-mapped dot-matrix imaging data on a large-scale low-density dot-matrix display is disclosed. Bit-mapped image data from each of multiple and adjacently oriented dot image data groups is allocated to drive one dot of the aforesaid display. This is done through a process in which a data selection sequence standard is employed to alternately select and extract image data from each of the aforesaid dot image data groups continually and repetitively at high speed, and in which the extracted image data from each dot image group is applied to drive one dot on the display.

Abstract: A punch unit for a press die for punching a hole in sheet metal includes: a piercing punch provided with a sharp projection; a plunger for pressing the piercing punch; a cylinder for supporting the piercing punch and the plunger slidably in a punching direction; and a coil spring for retracting the piercing punch and the plunger. Also disclosed are a press die for punching a hole in sheet metal and a punching method using the punch unit.

Abstract: A method of and system for displaying high-density bit-mapped dot-matrix imaging data on a large-scale low-density dot-matrix display is disclosed. Bit-mapped image data from each of multiple and adjacently oriented dot image data groups is allocated to drive one dot of the aforesaid display. This is done through a process in which a data selection sequence standard is employed to alternately select and extract image data from each of the aforesaid dot image data groups continually and repetitively at high speed, and in which the extracted image data from each dot image group is applied to drive one dot on the display.

Abstract: A method of and system for displaying high-density bit-mapped dot-matrix imaging data on a large-scale low-density dot-matrix display is disclosed. Bit-mapped image data from each of multiple and adjacently oriented dot image data groups is allocated to drive one dot of the aforesaid display. This is done through a process in which a data selection sequence standard is employed to alternately select and extract image data from each of the aforesaid dot image data groups continually and repetitively at high speed, and in which the extracted image data from each dot image group is applied to drive one dot on the display.

Abstract: A high-rise building with a large scale dot-matrix display device is disclosed. The glass panels arranged in rows and columns form a curtain wall structured transparent outer wall 12 extending over an exterior of a building 10. Each panel is installed apart from end portions of floor slabs to form a void space therebetween. A plurality of louver structured modules 22 are arranged within the void space in rows and columns to form a large scale display area. Each module 22 has a louver-like structure formed of a plurality of posts 24 arranged in substantially parallel relationship and a plurality of parallel, uniformly spaced beams 26 connecting said adjacent posts 24. A plurality of LED combination lamps 28 are mounted on each beam 26 at uniform pitches as those between the adjacent beams 26. The LEDs are driven by drive circuits disposed in each beam 26. The vertical guide members 44 are fixed to the end portions of the floor slabs 20.

Abstract: A process of manufacturing a sheet metal product including an opening surrounded at least partially by a drawn area, the process comprising steps of providing a pair of drawing dies, one having a drawing punch and the other having a drawing cavity adapted for cooperation with the drawing punch, putting a blank of sheet metal between the drawing dies, advancing one of the dies toward the other so that the blank is drawn by the punch and the cavity. The process includes a step of forming a slit in the blank by tearing the blank at an area which corresponds to the opening and which is adjacent to an area where the blank is stretched during the drawing step.