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Class 400/166 - Including impact control


Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein the arcuate movement of said type-head-carrier* toward
No. of patents: 90
Last issue date: 10/05/2004


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NumberTitleIssue Date
6801335Method of controlling impact printer noise
A method of controlling noise in an impact printer that modulates the input pulse to the power amplifier of the printer. The resulting current waveform is then applied to the print wire solenoids. The final shape of the force input to the platen reduces or spreads t...
10/05/2004
6141028Printer and control method therefor
A printer and control method for printing to various types of recording media store printing modes appropriate to those various types of recording media in a mode/media memory section. When a particular printing mode is selected while a particular type of...
10/31/2000
5639169Printer and method of control
Method and apparatus for altering the length of time a print head in a dot-matrix type of printer mechanism receives driving voltage in accordance with the type of recording media being used by the printer, and preselected print head driving modes selecte...
06/17/1997
5518327Wire motion detecting apparatus for wire dot head and wire dot impact printer apparatus therewith
The wire motion detecting apparatus according to the present invention comprises a velocity detecting portion for detecting the velocity of a printing wire, a comparator output signal generating portion for generating a first comparator output signal CMP ...
05/21/1996
5429442Print hammer coil current control
A low cost, integrated circuit compatible, circuit for constantly controlling the current in a print hammer coil is provided. The circuit is suitable for use with a hammer coil driven from the low voltage side (bottom drive) and in series with a sense res...
07/04/1995
5423618Piezoelectric print head control device using adjacent dot data
The present invention provides a print head control device for a wire dot printer, capable of preventing the occurrence of ghost dots to enable the wire dot printer to print characters and the like with a high print quality. The print head control device ...
06/13/1995
5320435Direct solenoid drive imprinting mechanism
An apparatus for embossing sheet material by applying pressure to punch and die members positioned on both sides of the sheet material using force developed by one or more solenoids to force the punch and die members together to apply an imprinting force....
06/14/1994
5295750Wire-dot impact printer
In a wire-dot impact printer having a capacitance detector for detecting a displacement of each armature by a sensor electrode arranged opposite the armature, a space is formed between each sensor electrode and its associated armature, and a shield patter...
03/22/1994
5201591Character printing device with pressure impact control
An impact-type printing device includes a printer for printing characters with a plurality of impression pressures including a high impression pressure sufficient for printing on all of the sheets of a set of copy sheets. The device also include a keyboar...
04/13/1993
5201876Method of adjusting the impact energy of a letter key or type element of a printing machine and typewriter, printer or the like printing machine using that method
The method for determining impact energy of a type element of the printing machine includes providing at least two different-length flight paths for the type elements by changing a distance between a resting position of the hammer and a place of impact of...
04/13/1993
5071268Wire-dot print head driving apparatus having sensing coils
In a driving apparatus for a wire-dot print head having electromagnets for driving print wires, each electromagnet comprising a core and a coil, sensing coils are provided in association with the respective electromagnets and provided to interlink the mag...
12/10/1991
5066150Low cost quiet impact printer
A serial impact printer including a platen mounted for rotation upon a support frame, a print element having character imprinting portions disposed thereon and a print element selector for moving the print element to position a selected character imprinti...
11/19/1991
5046413Method and apparatus for band printing with automatic home compensation
A system and method for automatically compensating for inaccuracies in the positioning of the timing mark sensor of a band line printer. A selected hammer is operated to impact a test character and an adjacent space between characters or a space provided ...
09/10/1991
4877342Method of moving print elements in printheads and a printhead with moving mechanism for print elements
The invention relates to a method in printheads (1) with a plurality of print elements (4) arranged movable in relation to each other and a moving mechanism (7, 9, 11, 12, 14) with magnetic field-responsive forces for moving selectable print elements to p...
10/31/1989
4874265Impact mechanism for impact printer
An impact mechanism for use in an impact printer, to deliver a printing force to drive a character element against a platen by means of a print tip movable toward and away from the platen. A rockable bail bar having an axis of rotation substantially paral...
10/17/1989
4848943Method and apparatus for energizing a printhead
A method and apparatus for energizing a printhead by maintaining substantially constant peak current in the actuator means of the printhead regardless of the duty cycle of the actuator means. The method and apparatus establishes a minimum time period for ...
07/18/1989
4838157Digital printhead energy control system
A digital printhead energy control system includes a first storage device for receiving hammer pulse duration data, a second storage device for receiving hammer pulse energization data and for producing a trigger signal and hammer pulse energization signa...
06/13/1989
4818128Impact printer capable of being equipped with an auto sheet feeder
An impact printer which can be equipped with an auto sheet feeder comprises printing means, driving means for driving the printing means and controlling means for controlling the driving means so as to reduce the printing strength of the printing means wh...
04/04/1989
4810113Print head driving system
A print head driving system for driving a print head having a plurality of print wire controlling magnetic circuits and a plurality of print wires respectively operatively associated with the print wire controlling magnetic circuits regulates the flight s...
03/07/1989
4806031Uniform print density and registration in an impact printer
Commencing with the first print hammer(s) "out", or actuated, on each print line the hammer drive current is boosted 10% for a period, ranging from 25%=650 microseconds for single part forms to 50% for multi-part forms, of the total print hammer flight ti...
02/21/1989
4797017Wire dot matrix printer capable of printing letters on a plurality of superposed sheets of paper
Disclosed is a wire dot matrix printer capable of printing letters on a plurality of superposed sheets of paper, in which there is provided a drive current adjuster for continuously increasing and decreasing the drive current of solenoids which move print...
01/10/1989
4774882Method for controlling printing impact power in impact type dot printer
A method for controlling printing impact in an impact type dot printer which controls printing impact energy to be increase in case of normal density imprint function and to be decreased in case of high density imprint function in the controlling means of...
10/04/1988
4741636Dot drive circuit of wire dot type printer
A dot drive circuit for a wire dot type printer including dot pins of a print head different in gaps with respect to a platen sets dot drive time intervals for each dot pin or for each dot pin group in accordance with the size of the gap....
05/03/1988
4740094Print pressure control device
There is disclosed a print pressure control device for a printer having at least two types of type wheels for printing characters, which gives different limits to a print pressure regulation switch depending on the type of the type wheel....
04/26/1988
4735517Printer having flux regulator
An impact printer has a flux regulator for each of the coils in its printhead. Each regulator provides a reference voltage indicative of the desired flux in the associated coil. A circuit is provided for measuring the flux in the coil and for providing a ...
04/05/1988
4710043Impact printer with variable delay for print cycle based on different print-hammer energy levels
A printing device comprises a carriage having a printing wheel, a printing ribbon driver and printing hammer fixed thereto, carriage driver for driving the carriage along a platen, wheel driver for setting the printing wheel to a position corresponding to...
12/01/1987
4690575Device for controlling printing pressure according to the kind of ink ribbon being used
A printer which operates to use selectively at least two different types of ink ribbons. The printer is characterized in that the printing pressure is varied in response to the selection of the type of ink ribbon....
09/01/1987
4685816Impact printer with means for adjusting the associated print hammer
An impact-type, printing apparatus which is readily adjusted to enable the impact face of the associated print hammer to be precisely located with reference to the plane of a character (or a typewheel) to be printed to enable printing in special fonts lik...
08/11/1987
4683817Dot matrix print head energy control circuit
A dot matrix print head energy control circuit (commonly known as voltage source compensation) utilizes two pulse width modulator circuits (one for receipt printing and one for forms printing). The control circuit also comprises control circuitry and a da...
08/04/1987
4681469Quiet impact printer
An improved serial impact printer designed to substantially reduce impact noise generation during the printing operation. The printer includes a print tip exhibiting high effective mass relatively movable with respect to a deformable platen, with a print ...
07/21/1987
4678355Print tip contact sensor for quiet impact printer
An impacting element for an impact printer having a platen, selectable character elements and means for driving the impacting element to impart a printing force to a selected character element, to drive it against said platen for a contact period, the imp...
07/07/1987
4668112Quiet impact printer
An improved serial impact printer designed to substantially reduce impact noise generation during the printing operation. The printer includes a print tip relatively movable with respect to a deformable platen, with a print element, a marking ribbon and a...
05/26/1987
4664543Device for monitoring and compensating for changes in the flight time of the print hammers of impact printers
A device for monitoring and compensating for changes in the flight time of the print hammers of impact printers is disclosed. The flight time of the respectively monitored hammer is calculated from the elapsed time between the moment of firing of a hammer...
05/12/1987
4653945Rotary wheel printing apparatus with controllable hammer striking force
There is provided a printing apparatus which drives a printing wheel in response to a rotation angle data corresponding to an input character code and drives a printing hammer with an impact force corresponding to this input character code. A data process...
03/31/1987
4597328Print hammer flight time control system
A hammer timing control system for the print hammers of a line printer uses a plurality of read/write RAMs in place of individual fire control circuits for controlling the firing periods of the hammers. A delay value RAM stores individual delay values to ...
07/01/1986
4592668Method for stamping indicia on materials
In a marking system for stamping materials such as aluminum strip, a pulse of determined energy is supplied to a solenoid, to impart a determined kinetic energy to a die. The die is guided to dissipate substantially all of this kinetic energy in the defor...
06/03/1986
4569607Printing hammer rebound control
A printing hammer rebound control system for use in impact-type printing machines is provided. The present system includes separate memory devices for storing the information of primary and its associated secondary energization. The primary energization i...
02/11/1986
4568208Printer
In a printer, a printing clutch and a hammer impact changeover mechanism are controlled through a control member by one electromagnet, in such a manner that in response to a printing signal the clutch is engaged through the control member by the electroma...
02/04/1986
4558965Printing apparatus controlling advancement of printing paper, actuation of a hammer, and advancement of an ink ribbon
A printing apparatus comprises a type wheel carrying a plurality of type elements and a platen for mounting and advancing a printing paper. A hammer can strike any one of the type elements against the printing paper and an ink ribbon is positionable betwe...
12/17/1985
4547087Microprocessor-controlled printing mechanism having an opto-electronic sensor
A plunger armature printing system incorporates an opto-electronic sensor for sensing the movement of a vane fixed to the armature of the print mechanism. The output signal generated by the sensor is employed to define periods for measurement of the speed...
10/15/1985
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