Automatic pipe cutting device

An automatic pipe cutting device comprising:

• a box-shaped main body having an opened top;
• two generally parallel supporting frames fixed to the main body;
• first and second guide bars transversely fixed to the supporting frames;
• a base plate having first and second bearing housings movable along the guide bars;
• a pair of springs wound around said second guide bar, the springs being disposed between said bearing housing and one of said supporting frames;
• a pipe fixing member including a first air cylinder disposed in a pipe entrance on said base plate, a hollow piston rod movable within a space in said first air cylinder, the hollow piston rod being moved in response to air supplied by the first air cylinder, the pipe fixing member further including a slotted clamp and a pressure rod, the slotted clamp being attached to said hollow piston rod through nuts which guide delivery of a pipe, the pressure rod being fixed to a rear portion of said slotted clamp, whereby upon delivery, the pipe is clamped by pressing the pressure rod centrally inwardly when the hollow piston rod moves to the pipe entrance area;
• a pipe cutting member including
• a second air cylinder fixed to said base plate adjacent to said pipe fixing member,
• a hollow piston rod for moving along an interior wall of said second air cylinder in response to a direction of air supply to the second air cylinder,
• a fixing pipe having a slant face for slidably contacting with a tapered slant face of said pressure rod, said fixing pipe inserting between said piston rod and said pipe fixing member and fixing to said second air cylinder,
• a pulley having a first bearing disposed on a circumferential surface of a rear portion of said piston rod,
• a tubular member having a plurality of guide rails disposed on a gradually narrowing slant face, the tubular member being connected to said pulley for rotating with the pulley, and
• a bit holding member supported by a second bearing disposed on a rear edge of the fixing pipe, said bit holding member being provided with a cutting bit fixed to one edge and
• said guide rail being fixed to an other edge thereof, whereby
• the pipe cutting member cuts the pipe by the cutting bit which rotates when the pipe fixing member presses the pipe, the piston rod pulls the rotating tubular member to the pipe entrance area and the bit holding member engaged with the guide rails is transported to a center thereof;
• an operating bar being fixed to said base plate at one end and being supported by a bearing housing at an other end thereof;
• a pipe cutting length adjusting member for adjustably fixing a position of said operating bar and for detecting passage of the pipe continuously and then immediately transmitting a signal to clamp a delivered pipe;
• and
• a pipe discharging member and for detecting completion of pipe cutting by the pipe cutting member and for discharging a cut pipe from the pipe cutting apparatus.