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Class 400/689 - Means for muffling typewriter noise


Subclass of Class 400 - Typewriting machines
Definition: Subject matter wherein significance is attributed to elimination
No. of patents: 40
Last issue date: 11/02/2010


NumberTitleIssue Date
7824119Transaction printer
A printer that can be configured either as a dot matrix/impact printer or an inkjet printer. A printer frame mounts a carriage mechanism for reciprocally moving a head carrier. An adapter secures a printhead to the carrier; the adapter being configured to accept a p...
11/02/2010
7073442Apparatus, systems and methods for use in three-dimensional printing
Apparatus, systems and methods for use in three-dimensional printing are shown and described. Various embodiments of the invention allow for more precise and controlled delivery of heat to achieve interlayer drying; isolation of the working region from the outside f...
07/11/2006
6695506Platen supporting device
In the present invention, a flat platen having a flat surface opposed to a print head is fixed to a platen supporting member by a fixing member, and a first impact absorbing member is disposed elastically between the platen and the platen supporting membe...
02/24/2004
6588955Anti-noise platen of the flat type for an impact printer
A platen (115) of the flat type for an impact printer comprising a metal body (220) for support and a plastics body (222) for protection and absorption of vibrations, in which the metal body (220) is completely embedded in the plastic body (222)....
07/08/2003
6336758Printer
A printer wherein a drive roller of a pair of sheet discharge rollers is made of rubber and a driven roller of the pair of sheet discharge rollers is made of synthetic resin; the leading end of a sheet is guided so as to be abutted against the drive rolle...
01/08/2002
6328491Vacuum platen and method for use in printing devices
A vacuum platen and method for use thereof in a printing device are disclosed. An apparatus embodiment includes a first surface having a plurality of first apertures therethrough, a labyrinth configured to include a plurality of passageways each of which ...
12/11/2001
5970866Printing machine with sound reducing apparatus
A printing machine comprising a sheet feeding station for feeding sheets into a printing station and capable of being detachably attached into a sheet inlet, a sheet discharging station for discharging printed sheets from the printing station and position...
10/26/1999
5669725Impact dot printer with noise suppression
An impact dot printer designed to reduce noise, including a first cover, a second cover, and an overlap portion therebetween. The first cover is located above a print section, and may include sound wave reflecting plates, sheet guide plates, and a sound a...
09/23/1997
5540511Impact dot printer with noise suppression
An impact dot printer designed to reduce noise, including a first cover, a second cover, and an overlap portion therebetween. The first cover is located above a print section, and may include sound wave reflecting plates, sheet guide plates, and a sound a...
07/30/1996
5350244Keyboard for typewriter and the like
A keyboard for a typwriter and the like, has at least one elongated key, elements for swivellably supporting the key and including at least one substantially U-shaped bracket with a U-bottom, two U-legs connected with opposite ends of the U-bottom, and tw...
09/27/1994
5310270Printing method for dot impact type serial printer
A dot impact type serial printer is provided with a print head which has a plurality of print wires for printing an image. The print wires required to print a particular image are thrust toward a platen successively upon receiving a print timing signal, w...
05/10/1994
5240336Dot matrix printer with suppressed printing noises
A dot matrix printer of a dispersion printing type in which a printing noise is suppressed and dots arranged in longitudinal rows are driven while shifting the timing for every print wire dot. The present dot matrix printer is characterized by a construct...
08/31/1993
5226365Printing press cylinder with oscillation damping
A printing press cylinder with oscillation damping for a sheet-fed rotary printing press utilizes a hollow cylinder shell with interior oscillation damping core materials to dampen oscillation caused by the placement of channels in the shell. The oscillat...
07/13/1993
5174671Printing mechanism with print hammer having noise dampener
A printing device including a print hammer having a noise dampener for use with an impact printer mechanism. The print hammer has a significant mass for impacting a character pad against an ink ribbon, paper and a platen. In a first embodiment the print h...
12/29/1992
5149213Noise reducing back stopper for an impact print head
A print head for a dot printer of the present invention includes a plurality of armatures which support a print wire on one end. A back stopper is provided on the rear side of the armatures to stop the armature as the print wire retreats after a print str...
09/22/1992
5121811Noise reducing device for printer
A noise reducing device for printers including a noise reducing hollow body consisting of at least one hollow duct at one side of a sheet delivery opening opposedly arranged to a printed sheet guiding-receiving member positioned at the other side of the s...
06/16/1992
5069566Acoustically dampened striker bar for impact printers and methods of assembly
A striker bar assembly includes a striker bar body having a recess at each of its opposite ends opening through top, bottom and end wall surfaces. The striker bar body has a flat impact surface perpendicular to the top and bottom surfaces. Generally T-sha...
12/03/1991
5046874Impact printer print head with active sound pressure attenuation means
An improved impact printer print head is provided that includes the means for active attenuation of acoustic emission in the vicinity of the print head in a printer. The print head incorporates an acoustic speaker in its assembly and/or construction. The ...
09/10/1991
5040912Printer having a top cover with an access shutter
In a printer, a recording medium can be fed into and drawn out of a body through a rear opening formed in the body. A top cover assembly including a top cover and a shutter is angularly movable relatively to the body between an open position permitting ac...
08/20/1991
5033892Printer case
A printer case permits paper to be placed in a printer or the ink ribbon to be replaced without the need to remove the cover or the paper shelf. The case comprises a cover mounted on the upper surface of the case and a paper shelf mounted so as to be swin...
07/23/1991
4968164Printing assembly, adapted for reduction of its operational sound level
A printing assembly which is adapted for printing on a print medium in a m of a sheet or tape includes a printing cylinder on which is wound and urged the print medium during a printing operation. A printing device prints on the print medium and urges it...
11/06/1990
4943173Sound dampening impact printer
A printer has a feeding path for guiding a printing paper from and toward an opening of the printer. A cross-sectional shape of the feeding path is minimized to be sufficient to pass the printing paper through the feeding path. At least one resonator is a...
07/24/1990
4920237Membrane keyboards
A membrane keyboard has two spaced flexible membranes (1 and 2) carrying contact pad assemblies. Acoustic pads (15) of expanding ink are printed on the top surface of the upper membrane (2) between the contact pads (4) and the key buttons used to operate ...
04/24/1990
4758103Method and apparatus for quieting the operation of a dot matrix printer
A method and apparatus for quieting the operation of a dot matrix printer by logically dividing the data to be printed among timed spaced printing passes is disclosed. A matrix of data to be printed is stored in a memory. A slice of data is selected from ...
07/19/1988
4747717Guide means
Guide means for a printer including two conductor members for guiding a paper web out of the printer. In a first position, the conductor members form a tightly fitting cover for a rectangular hole in a casing associated with the printer, where the paper w...
05/31/1988
4737046Core member for platen roll
A platen roll core member including an axle part, an external tube part coaxially disposed around the axle part and webs extending therebetween having a plurality of projections formed by at least one surface extending rectilinearly in the axial direction...
04/12/1988
4723857Printer with a plastic frame structure
A printing mechanism assembly, which includes a platen, a print head opposed to the platen for printing operation, a carriage carrying the print head thereon, and a guide rod for supporting the carriage so as to be movable along a print line, is supported...
02/09/1988
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
4620810Sound proof device of a printer
With respect to a printer which carries out printing on a paper by impact of a wire of a printing head repeating movement, a sound proof device of a printer prevents the paper from transmitting fluttering under amplification to the paper sent to an entran...
11/04/1986
4526489Printer housing with web tensioning means
A housing for an impact printer has a case body and a cover thereof. They define therebetween an opening for the passage of the paper to be printed and the printed paper. A paper shelf lies over the top surface of the case body, and supported at one end r...
07/02/1985
4465390Printer comprising a noise-sealing paper-transport roller
A printer in which paper transport takes place from a sealed entrance opening in a housing to the printing area, and then to a sealed exit opening of the housing. The entrance and exit opening is sealed against escape of noise by a rotatable cylindrical f...
08/14/1984
4453848Noise-reducing platen
A noise-reducing platen comprising a circular cylinder, a hub disposed along the longitudinal axis of and within the cylinder, and walls for dividing the annular region between the cylinder and the hub into a plurality of separated longitudinal channels e...
06/12/1984
4431324Sound damping ribbon cartridge for a typewriter or similar office machine
In a ribbon cartridge for an office writing machine, which cartridge includes a housing having a base plate, a supply reel and a take-up reel mounted in the housing, a carbon ribbon wound around the reels and mounted to be conducted from the supply reel t...
02/14/1984
4410291Antinoise device for impact serial printers
A serial printer is disclosed where the printing is performed by a printing head (22) mounted on a carriage (21) movable along the printing line, a transparent leaf (36) mounted on the carriage presses the printing support (25) (paper) against a platen (2...
10/18/1983
4318452Noise-reduced constructional unit of a device
The impact beam of a mechanical printer is constructed for noise dampening and yet exhibits a high resistance to wear. The beam unit comprises a block of dampening material which is held along a carrier support wall. A strip of metal is arranged along an ...
03/09/1982
4247213Platen for printing devices
A noise-reducing hollow platen having a hard external tube filled with steel or lead spheres....
01/27/1981
4215946Impact receiving structure for impact type printing mechanism
An impact receiving structure for an impact type printing mechanism, in which vibration members for guiding along branched paths the vibration of an impact receiving face member, which is vibrated by the striking energy of a printing hammer, are provided ...
08/05/1980
4197024Acoustical damping for printer
An apparatus for damping the acoustical impact noise traveling along a length of paper as it passes through a printer including resilient urethane foam rollers in engagement with a large proportion of the width of the paper with a pressure damping roller ...
04/08/1980
3998153High frequency power integrating printer
In order to reduce the noise resulting from the act of printing in a typewriter or line printer, the hammer is oscillated at high frequency with low power pulses, and the oscillating hammer is moved into proximity to the inked ribbon whereby the hammer re...
12/21/1976
3944029Damper for printing and the like
A damper for line printers and the like in which the print head moves from left to right across a paper document during the printing phase and upon completion of a line of print, moves in the "carriage return" direction at a more rapid rate to return to t...
03/16/1976
 
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