Film displacement device for x-ray apparatus

Claim 2

In an X-ray apparatus including a base and a carriage for carrying a film, the improvement in combination therewith of means for displacing said carriage comprising a frame which is linearly displaceable on said base in a first direction, said carriage being carried by said frame and being displaceable linearly on said frame in a second direction normal to said first direction, first drive means for moving said carriage in said second direction comprising a system of pulleys and a cord of fixed length extending about said pulleys with ends of the cord fixedly secured on said base at first and second fixed points, said pulleys including a stationary pulley means fixed on said base, first and second carriage pulleys on said carriage, and first and second pairs of frame pulleys on said frame, one pair generally adjacent each of said carriage pulleys, said cord formed as a principal loop extending from said first fixed point to said stationary pulley means and back to said second fixed point, said cord further formed into two secondary loops, each situated along the principal loop intermediate one end of the cord and said stationary pulley means, wherein said cord from said first fixed point extends to one of the pulleys of said first pair of frame pulleys, then to the first carriage pulley, then to the other of said first pair of frame pulleys, then to said stationary pulley means, then to one of the pulleys of said second paIr of frame pulleys, then to the second carriage pulley, to the remaining frame pulley, and then to the second fixed point, said drive means further comprising motor means for displacing a portion of said cord extending between said two carriage pulleys for moving the carriage in said second direction.

Claim 3

Apparatus according to claim 1 wherein said first direction is horizontal and said second direction is vertical.

Claim 4

Apparatus according to claim 1 wherein said stationary pulley means comprises two spaced-apart pulleys on said base defining between them a line in said second direction.

Claim 5

Apparatus according to claim 1 wherein said cord is in frictional engagement with said pulleys, said stationary pulley means comprises at least one pulley, and said motor means rotates said stationary pulley for said displacement of the cord engaged thereto.

Claim 6

Apparatus according to claim 1 further comprising second drive means for driving said frame in said first direction.

Claim 7

Apparatus according to claim 4 further comprising a potentiometer driven by said first drive means to register the amount of rotation of said stationary pulley and the corresponding amount of movement of said carriage.

Claim 8

In an X-ray apparatus including a base and a carriage for carrying a film, the improvement in combination therewith of means for displacing said carriage comprising a frame which is displaceable only linearly on said base in a first direction, said carriage being carried by said frame and being displaceable only linearly on said frame in a second direction normal to said first direction, first drive means for moving said carriage in said second direction comprising a system of pulleys and a cord of fixed length extending about said pulleys with ends of the cord fixedly secured on said base at first and second fixed points, said pulleys including a stationary pulley means fixed on said base, first and second carriage pulleys on said carriage, and first and second pairs of frame pulleys on said frame, one pair generally adjacent each of said carriage pulleys, said cord formed as a principal loop extending from said first fixed point to said stationary pulley means and back to said second fixed point, said cord further formed into two secondary loops, each situated along the principal loop intermediate one end of the cord and said stationary pulley means, wherein said cord from said first fixed point extends to one of the pulleys of said first pair of frame pulleys, then to the first carriage pulley, then to the other of said first pair of frame pulleys, then to said stationary pulley means, then to one of the pulleys of said second pair of frame pulleys, then to the second carriage pulley, then to the remaining frame pulley, and then to the second fixed point, said drive means further comprising motor means for rotating said stationary pulley means for displacing a portion of said cord extending thereabout and between said two carriage pulleys for moving the carriage in said second direction.

Claim 9

In an X-ray apparatus including a base and a carriage for carrying a film, the improvement in combination therewith of means for displacing said carriage comprising a frame which is displaceable only linearly on said base in a first direction, said carriage being carried by said frame and being displaceable only linearly on said frame in a second direction normal to said first direction, first drive means for moving said carriage in said second direction comprising a system of pulleys and a cord of fixed length extending about said pulleys with ends of the cord fixedly secured on said base at first and second fixed points, said pulleys including a stationary pulley means fixed on said base, first and second carriage pulleys on said carriage, and first and second pairs of frame pulleys on said frame, one pair generally adjacent each of said carriage pulleys, said cord formed as a principal loop extending from said first fixed point to said stationary pulley means and back to said second fixed point, said cord further formed into two secondary loops, each situated along the principal loop intermediate one end of the cord and said stationary pulley means, wherein said cord from said first fixed point extends to one of the pulleys of said first pair of frame pulleys, then to the first carriage pulley, then to the other of said first pair of frame pulleys, then to said stationary pulley means, then to one of the pulleys of said second pair of frame pulleys, then to the second carriage pulley, then to the remaining frame pulley, and then to the second fixed point, said drive means further comprising motor means for rotating said stationary pulley means for displacing a portion of said cord extending thereabout and between said two carriage pulleys for moving the carriage in said second direction.