Impact line printer

Claim 2

In an impact line printer a hammer bar adjustably supported in a machine frame for arcuate movement around a fixed pivot, a bank of impact hammers secured to said hammer bar, individual adjusting means in said hammer bar for controlling the throw of the individual impact hammer, a yoke pivotally mounted in said machine frame, a pair of pulleys rotatively supported in said yoke, a closed loop belt, supporting an array of carriers provided with type faces, operatively connected to said pair of pulleys for movement of said type faces past said bank of impact hammers on a print line for printing on a web, and circuit means for rotating said pulleys and providing signals indicating the position of said type faces and the firing of the impact hammers in selected sequence.

Claim 3

The impact hammer printer of claim 1 in which the yoke comprises a carrier guide track having an anvil fastened to said yoke, with said array of carriers rotatively traversing through said guide track past said bank of impact hammers on a print line provided by said anvil for printing on a web, and circuit means including a motor for driving said pair of pulleys, a belt timing sensor and a hammer impulse sensor for providing signals indicating the position of said type faces and the firing of the impact hammers in selected sequency, said yoke pivotally moving said carrier guide track and anvil toward and away from said bank of hammers.

Claim 4

An impact hammer printer comprising a machine frame having a base plate provided with a paper feed opening, a left side and a right side, elongated slots in, respectively, said left side and right side, a left side pivot plate provided with two left side pads and an elongated slot aligned with said elongated slot in said left side, a pivot pin fastened in said left side pivotally mounting said left side pivot plate to said left side, means fastening said left side pivot plate in selected arcuate position in relation to said left side, a left side pivot arm pivotally mounted in said left side pivot plate, a left side fine density adjusting screw rotatively mounted in said two left side pads abutting one end of said left side pivot arm, a right side pivot plate provided with two right side pads and an elongated slot aligned with said elongated slot in said right side, a pivot pin fastened in said right side pivotally mounting said right side pivot plate to said right side, means fastening said right side pivot plate in selected arcuate position in relation to said right side, a right side pivot arm pivotally mounted in said right side pivot plate, a right side fine density adjusting screw rotatively mounted in said two risht side pads abutting one end of said right side pivot arm, a hammer bar having a left side mounting plate projecting through the elongated slots in said left side and said left side pivot plate, and right side mounting plate projecting through the elongated slots in said right side and right side mounting plate, left side spring means fastened at one end in said left side mounting plate and the other end fastened to said left side, right side spring means fastened at one end in said right side mounting plate and on the other end fastened to said right side, said left side mounting plate abutting the other end of said left side pivot arm, and said right side mounting plate abutting the other end of said right side pivot arm, whereby rotation of said left side and right side fine density adjusting screws slidably moves said hammer bar against the tension of said left side and right side spring means to move said hammer bar back and forth in said elongated slots.

Claim 5

An impact hammer printer comprising a machine frame having a base plate provided with a paper feed opening, a left side and a right side, elongated slots in, respectively, said left side and right side, a left side pivot plate provided with two left side pads and an elongated slot aligned with said elongated slot in said left side, a pivot pin fastened in said left side pivotally mounting said left side pivot plate to said left side, means fastening said left side pivot plate in selected arcuate position in relation to said left side, a left side pivot arm pivotally mounted in said left side pivot plate, a left side fine density adjusting screw rotatively mounted in said two left side pads abutting one end of said left side pivot arm, a right side pivot plate provided with two right side pads and an elongated slot aligned with said elongated slot in said right side, a pivot pin fastened in said right side pivotally mounting said right side pivot plate to said right side, means fastening said right side pivot plate in selected arcuate position in relation to said right side, a right side pivot arm pivotally mounted in said right side pivot plate, a right side fine density adjusting screw rotatively mounted in said two risht side pads abutting one end of said right side pivot arm, a hammer bar having a left side mounting plate projecting through the elongated slots in said left side and said left side pivot plate, and right side mounting plate projecting through the elongated slots in said right side and right side mounting plate, left side spring means fastened at one end in said left side mounting plate and the other end fastened to said left side, right side spring means fastened at one end in said right side mounting plate and on the other end fastened to said right side, said left side mounting plate abutting the other end of said left side pivot arm, and said right side mounting plate abutting the other end of said right side pivot arm, whereby rotation of said left side and right side fine density adjusting screws slidably moves said hammer bar against the tension of said left side and right side spring means to move said hammer bar back and forth in said elongated slots.

Claim 6

The impact hammer printer of claim 3 in which the hammer bar is provided with an upper bank and a lower bank of impact hammers, individual adjusting means in said hamMer bar for controlling the throw of the individual impact hammer, a carrier guide track, having an anvil, fastened in said machine frame, a pair of pulleys rotatively mounted in said machine frame, a closed loop belt, supporting an array of carriers provided with type faces, operatively connected to said pair of pulleys so as to traverse through said guide track past said bank of impact hammers on, a print line provided by said anvil for printing on a web, and circuit means including a motor for driving said pair of pulleys, a belt timing sensor and a hammer impulse sensor for providing signals indicating the position of said type faces and the firing of the impact hammers in selected sequence, the arcuate movement and the fine density adjusting screw movements adjusting the position of the platen on the impact hammers in relation to the array of characters at the moment of impact.

Claim 7

In an impact line printer, a hammer bar adjustably supported in a machine frame, a bank of impact hammers secured to said hammer bar, individual adjusting means in said hammer bar for controlling the throw of the individual impact hammer, a paper shield fastened to said hammer bar, a yoke, provided with a platform, pivotally mounted in said machine frame, a pair of pulleys rotatively supported on said platform, a magnetic sensitive timing gear fastened to one of said pair of pulleys, a carrier guide track having an anvil fastened to said platform, a closed loop belt, supporting an array of carriers provided with magnetic sensitive type faces, operatively connected to said pair of pulleys for movement of said type faces past said bank of impact hammers on a print line for printing on a web, said carrier guide track guiding said closed loop belt through the path of travel of a print line, a pair of paper clamps fastened to said platform, latch means releasably securing said yoke to said machine frame, said yoke pivotally moving said carrier guide track, anvil and pair of paper clamps toward and away from said bank of hammers and said paper shield, and circuit means, including a motor for driving said pair of pulleys, and magnetic sensitive timing gear, belt timing sensor and a hammer impulse sensor for providing signals indicating the position of said type faces and the firing of the impact hammers in selected sequence and for actuating said pair of paper clamps toward and away from said paper shield.

Claim 8

In an impact line printer, a hammer bar adjustably supported in a machine frame, a bank of impact hammers secured to said hammer bar, individual adjusting means in said hammer bar for controlling the throw of the individual impact hammer, a paper shield fastened to said hammer bar, a yoke, provided with a platform, pivotally mounted in said machine frame, a pair of pulleys rotatively supported on said platform, a magnetic sensitive timing gear fastened to one of said pair of pulleys, a carrier guide track having an anvil fastened to said platform, a closed loop belt, supporting an array of carriers provided with magnetic sensitive type faces, operatively connected to said pair of pulleys for movement of said type faces past said bank of impact hammers on a print line for printing on a web, said carrier guide track guiding said closed loop belt through the path of travel of a print line, a pair of paper clamps fastened to said platform, latch means releasably securing said yoke to said machine frame, said yoke pivotally moving said carrier guide track, anvil and pair of paper clamps toward and away from said bank of hammers and said paper shield, and circuit means, including a motor for driving said pair of pulleys, and magnetic sensitive timing gear, belt timing sensor and a hammer impulse sensor for providing signals indicating the position of said type faces and the firing of the impact hammers in selected sequence and for actuating said pair of paper clamps toward and away from said paper shield.

Claim 9

The impact hammer printer of claim 5 in which the machine frame consists of a left side and a right side fastened to a base plate having a paper feed opening, a motor, having a motor shaft, forming part of said circuit means fastened to said left side, with said motor shaft projecting through an orifice provided in said left side, a small drive pulley fastened to said motor shaft, a driving shaft rotatively supported, respectively, in said left side and said right side, a large drive pulley fastened to one end of said driving shaft, a belt rotatively connecting said small drive pulley with said large drive pulley, a support rod fastened on opposite ends in said left side and said right side, two paper tractors, each tractor having two sprockets rotatively mounted, respectively, upon said driving shaft and rod, a closed loop toothed chain, one for each of said two paper tractors, mounted around said two sprockets, whereby said motor in the timed sequence of said circuit means rotates said driving shaft and two sprockets to advance a paper web.

Claim 10

The impact hammer printer of claim 6, in which, a driven pulley is fastened to the other end of said driving shaft, a stub shaft fastened to said right side, a timing wheel, having two rim peripheries, fastened to said stub shaft, a belt rotatively connecting said timing wheel with said driven pulley, one of said two rim peripheries having one notch, the other of two rim peripheries having a plurality of notches evenly spaced around said rim, an electric switch having a switch button, forming part of said circuit means and fastened to said right side, said switch button riding said rim having one notch and being actuated by said notch, a second electric switch, having a switch button, forming part of said circuit means and fastened to said right side, said last mentioned switch button riding said rim having a plurality of notches and being actuated by said notches, to thereby control the feeding of the paper web through said circuit means.

Claim 11

The impact hammer printer of claim 6 in which a left bracket is fastened to said platform, a left ribbon motor having a left ribbon shaft, fastened to said left bracket with said left ribbon shaft rotatively supported in said left bracket and said left side plate, a left ribbon spool fastened to said left ribbon shaft, a right ribbon motor having right ribbon shaft, fastened to said right bracket with said right ribbon shaft rotatively supported in said right bracket and said right side plate, and a right ribbon spool fastened to said right ribbon shaft and a ribbon fastened on one end to said left ribbon spool and on the other end to said right ribbon spool, said ribbon rotatively passing on a print line for printing on a web, said left ribbon motor and said right ribbon motor forming part of said circuit means to be actuated in timed sequence by said circuit means.

Claim 12

In an impact line printer, a machine frame having a base plate, a hammer bar supported in said machine frame, a bank of impact hammers secured to said hammer bar, a yoke consisting of a left side plate and a right side plate integrally connected by a platform, a left bracket and a right bracket fastened to said base plate, a left pin pivotally mounting said left side plate to said left bracket, a right pin pivotally mounting said right side plate to said right bracket, an adjustable left side seating screw rotatively secured in said base plate, an adjustable right side seating screw rotatively secured in said base plate, a left foot on said left side plate removably engaging said left side seating screw, a right foot on said right side plate removably engaging said right side seating screw, a left side lever pivotally connected to said left side plate, a locking link provided with a hook pivotally connected to said left side lever, an upper left spring fastened on one end to said left side lever and on the other end to said left side plate, a lower left coil spring fastened on one end to said locking link and on the other end to said left side plate, a pad fastened to said base plate, an eccentric pin adjustably secured in said pad, said hook removably engaging said eccentric pin, a right side lever pivotally connected to said right side plate, a right side locking link, provided with a right side hook, pivotally connected to said right side lever, an upper right coil spring fastened on one end to said right side lever and on the other end to said right side plate, a lower right coil spring fastened on one end to right side locking link and on the other end to said right side plate, a right side pad fastened to said base plate, an eccentric pin adjustably secured in said right side pad, said right side hook removably engaging said last mentioned eccentric pin, an electrical safety switch having a switch button fastened to said right side pad, said switch normally open is closed said right side hook engages said switch button to close said electrical safety switch, a cross bar fastened on opposite ends, respectively, to said left side plate and said right side plate, a pair of pulleys rotatively supported in said platform, a closed loop belt, supporting an array of carriers provided with type faces, operatively connected to said pair of pulleys for movement of said type faces past said bank of impact hammers on a print line for printing on a web, said yoke pivotally moving said type faces toward and away from said bank of hammers.

Claim 13

In an impact line printer, a machine frame having a base plate, a hammer bar supported in said machine frame, a bank of impact hammers secured to said hammer bar, a yoke consisting of a left side plate and a right side plate integrally connected by a platform, a left bracket and a right bracket fastened to said base plate, a left pin pivotally mounting said left side plate to said left bracket, a right pin pivotally mounting said right side plate to said right bracket, an adjustable left side seating screw rotatively secured in said base plate, an adjustable right side seating screw rotatively secured in said base plate, a left foot on said left side plate removably engaging said left side seating screw, a right foot on said right side plate removably engaging said right side seating screw, a left side lever pivotally connected to said left side plate, a locking link provided with a hook pivotally connected to said left side lever, an upper left spring fastened on one end to said left side lever and on the other end to said left side plate, a lower left coil spring fastened on one end to said locking link and on the other end to said left side plate, a pad fastened to said base plate, an eccentric pin adjustably secured in said pad, said hook removably engaging said eccentric pin, a right side lever pivotally connected to said right side plate, a right side locking link, provided with a right side hook, pivotally connected to said right side lever, an upper right coil spring fastened on one end to said right side lever and on the other end to said right side plate, a lower right coil spring fastened on one end to right side locking link and on the other end to said right side plate, a right side pad fastened to said base plate, an eccentric pin adjustably secured in said right side pad, said right side hook removably engaging said last mentioned eccentric pin, an electrical safety switch having a switch button fastened to said right side pad, said switch normally open is closed said right side hook engages said switch button to close said electrical safety switch, a cross bar fastened on opposite ends, respectively, to said left side plate and said right side plate, a pair of pulleys rotatively supported in said platform, a closed loop belt, supporting an array of carriers provided with type faces, operatively connected to said pair of pulleys for movement of said type faces past said bank of impact hammers on a print line for printing on a web, said yoke pivotally moving said type faces toward and away from said bank of hammers.

Claim 14

The impact hammer printer of claim 6 in which a pair of electrically actuating paper clamps are fastened to said platform, a paper shield fastened to said hammer bar, and electriCal circuit means actuating said pair of paper clamps toward and away from said paper shield.