Means For Muffling Typewriter Noise Patents (Class 400/689)
  • Patent number: 9022675
    Abstract: An image forming apparatus includes a drive source configured to drive a member for forming an image on a recording material, a frame of the image forming apparatus including a planar portion on which the drive source is mounted, wherein a plurality of through holes is formed on the entire planar portion of the frame, and a sheet member configured to cover at least a portion of the plurality of through holes.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: May 5, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiyuki Maekawa, Masatoshi Yamashita, Daisuke Takamura
  • Patent number: 8606167
    Abstract: A medium clamping device includes a device main unit that includes: a first circularly moving body that has a surface circularly moving and harder than a recording medium; a second circularly moving body that has a surface moving circularly and harder than the recording medium passing between the both surfaces of the two circularly moving bodies; and a load applying section that applies a load to at least one of the first circularly moving body and the second circularly moving body, to sandwich the recording medium by the load with two moving bodies. The medium clamping device further includes: a support section that supports the device main unit and is secured to a fixed body; and an alleviating system that alleviates transmission of a shock from the device main unit to the fixed body and is incorporated in the support section.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: December 10, 2013
    Assignee: Fuji Xerox Co., Ltd
    Inventors: Haruhiko Nishida, Toshinori Sasaki, Masaru Funayanagi
  • Patent number: 7824119
    Abstract: 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 predetermined type of printhead. A compensator/feeder assembly is pivotally movable between a printing position and a printer open position at which a slot for receiving a form is defined. The compensator/feeder assembly mounts a printer bar which is positioned in a confronting relationship with the printhead when the assembly is in the printing position. A compensator drive arrangement is fixed to a base and effects movement in the feeder assembly.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: November 2, 2010
    Assignee: Pertech Resources, Inc.
    Inventors: Kevin Kershisnik, Donna Norton, Eric Wolfe, David Selvig, Jon Walker, Douglas Etsinger, Jeff Cooper
  • Patent number: 7778665
    Abstract: A PDA arrangement includes a PDA station and a PDA device detachably mounted thereto. The PDA station includes a first casing and a second casing pivotally connecting thereto edge-to-edge, wherein the first casing includes a first PDA-functional keypad and a computer-functional keypad on inner and outer sides thereof, wherein the second casing includes a second PDA-functional keypad. The first casing further has an accessing window. The PDA device is detachably mounted at the accessing window of the PDA station and is wirelessly communicating with the PDA station. The PDA station further has a plurality of card holders provided on the second casing, wherein each of the card holders is adapted for operatively holding a data card thereat such that data stored at the PDA device is synchronously copied to the data cards respectively held at the card holders through the PDA station.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: August 17, 2010
    Inventor: Yimwai Yau
  • Patent number: 7073442
    Abstract: 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 for reasons of cleanliness and in connection with the vapors of organic solvents; better control of the temperature of the working region; better accuracy in the flowrates of binder fluid dispensed; matching of delivered flowrates for multiple dispensers; verification of delivered flowrate or drops; provision for easier changeover of the machine from one powder to another; cleanability; and other needs.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: July 11, 2006
    Assignee: AFBS, Inc.
    Inventors: Jeffrey A. Fedor, Christopher M. Gaylo, Peter A. Materna
  • Patent number: 6695506
    Abstract: 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 member. Accordingly, the propagation of vibration between the platen and the platen supporting member is prevented by a vibration absorbing action of the first impact absorbing member and vibrations in a vibration generation source are absorbed quickly. Thus, according to the present invention, a printing noise can be damped effectively.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: February 24, 2004
    Assignee: Toshiba TEC Kabushiki Kaisha
    Inventor: Hajime Yamamoto
  • Publication number: 20030137803
    Abstract: A keyboard device for a personal digital assistant (PDA) includes first and second casing members that are pivotally interconnected, and a keyboard module mounted on inner surfaces of the casing members. The inner surface of one of the casing members further has a support frame for adjustably supporting the PDA. A connector unit on the support frame connects electrically the PDA to the keyboard module.
    Type: Application
    Filed: January 22, 2002
    Publication date: July 24, 2003
    Inventor: Jyh-Yi Loo
  • Patent number: 6588955
    Abstract: 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).
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: July 8, 2003
    Assignee: Compuprint SpA
    Inventor: Cosimo Cassiano
  • Patent number: 6336758
    Abstract: 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 roller earlier than the driven roller; the sheet that is in the course of being discharged is guided by a sheet discharge tray so as to come in slidable contact with an edge portion that is on a print head side of a sheet discharge opening. As a result, the printer can provide satisfactory printing conditions quickly with a simple structure and reduce noise leaking from the sheet discharge opening.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: January 8, 2002
    Assignee: Seiko Epson Corporation
    Inventors: Hiroshi Ishida, Shigeki Mizuno, Kenjiro Murakami, Toshikazu Kotaka, Tatsumi Tsuboki, Motoyuki Niimura, Norio Horaguchi, Yoshiaki Nakayama
  • Patent number: 6328491
    Abstract: 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 is fluidly coupled to at least one of the first apertures, and a second surface having a plurality of second apertures therethrough each of which is fluidly coupled to the vacuum source and at least one of the passageways thereby establishing an airflow from the first apertures, through the passageways, and out the second apertures. The vacuum platen also includes at least one receptacle in each of the passageways, each receptacle configured to collect debris from the airflow as it travels through the labyrinth.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: December 11, 2001
    Assignee: Hewlett-Packard Company
    Inventors: James O Beehler, Steve O Rasmussen, Robert M Yraceburu
  • Patent number: 5970866
    Abstract: 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 positioned near a sheet outlet, and a cover disposed near at least the sheet inlet or the sheet outlet and shielding either the sheet inlet or sheet outlet except for at a sheet passing area thereof.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: October 26, 1999
    Assignee: Tohoku Ricoh Co., Ltd.
    Inventor: Eiji Okawa
  • Patent number: 5669725
    Abstract: 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 absorbing member, each reflecting plate, each sheet guide plate, and the sound absorbing member being arranged close to the print section. The second cover is rotatable relative to the first cover and forms a printed sheet discharge path together with the first cover. The second cover also has sound wave reflecting plates and sheet guide plates. Each sheet guide plate is designed to be projected farther from the associated cover than the corresponding reflecting plate on said cover. The distance between adjacent sheet guide plates is made smaller than the width of the smallest sheet to be used in the printer.
    Type: Grant
    Filed: June 18, 1996
    Date of Patent: September 23, 1997
    Assignee: Seiko Epson Corporation
    Inventors: Osamu Koshiishi, Shigeki Mizuno, Keiichi Kubota, Katsuhiko Nishizawa, Motoyuki Niimura, Hiroshi Shirotori, Kyoui Ko
  • Patent number: 5540511
    Abstract: 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 absorbing member, each reflecting plate, each sheet guide plate, and the sound absorbing member being arranged close to the print section. The second cover is rotatable relative to the first cover and forms a printed sheet discharge path together with the first cover. The second cover also has sound wave reflecting plates and sheet guide plates. Each sheet guide plate is designed to be projected farther from the associated cover than the corresponding reflecting plate on said cover. The distance between adjacent sheet guide plates is made smaller than the width of the smallest sheet to be used in the printer.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: July 30, 1996
    Assignee: Seiko Epson Corporation
    Inventors: Osamu Koshiishi, Shigeki Mizuno, Keiichi Kubota, Katsuhiko Nishizawa, Motoyuki Niimura, Hiroshi Shirotori, Kyoui Ko
  • Patent number: 5350244
    Abstract: 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 two projections extending from free ends of the U-legs and parallel to the U-bottom, such that the key is swivellably supported on the projections with a play. At least two stationary swivel bearings swivellably support the U-bottom of the bracket. At least one of the bracket and the key is supported in a bearing point in a noise-dampening manner.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: September 27, 1994
    Assignee: TA Triumph-Adler AG
    Inventor: Gunter Buttner
  • Patent number: 5310270
    Abstract: 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, where each print timing signal is delayed from the previous print timing signal by a predetermined time interval t. The delay of each print timing signal is based on the time required for a surface wave, caused by the impact of print wires on the platen, to pass lengthwise across the platen and is selected to be less than one-half the surface wave travel time.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: May 10, 1994
    Assignee: Nec Corporation
    Inventor: Hiroyuki Matsukura
  • Patent number: 5240336
    Abstract: 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 construction in which respective print wires are driven at different timings within one pitch, and a space around a print head is surrounded by a housing and a platen, and a sound generated in the space is transmitted outside through walls. Further, the present dot matrix printer is characterized in that there is provided a memory storing printing intervals among the whole dots and print head conduction time, and the print head is driven in accordance with information read out of said memory in order to correct deviation of dot rows arranged in a longitudinal direction of the print head from perpendicularity.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: August 31, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadashi Shiraishi, Yutaka Miyazono, Seiji Kimura, Syogo Horinouchi, Yuuji Terashima, Takashi Haruguchi, Kazumi Ootubo
  • Patent number: 5226365
    Abstract: 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 oscillation damping core materials may include a solid cylinder core, oscillation damping materials, or a plurality of metal balls.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: July 13, 1993
    Assignee: Koenig & Bauer Aktiengesellschaft
    Inventor: Dieter J. Wieland
  • Patent number: 5174671
    Abstract: 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 hammer includes an acoustic noise dampening layer interposed between a mass weight and the hammer face which carries the anvil that impacts during printing. In other embodiments the print hammer is formed in two parts. One part having a weighted mass and the other part being pivotally coupled to the printer mechanism. The two parts are structurally joined together by a noise dampening member. Transmission of acoustic noise during impact printing through the hammer is reduced.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: December 29, 1992
    Assignee: Smith Corona Corporation
    Inventors: Stephen M. Pawlak, Roger J. Rimbey, Donald G. Anderson, Jr.
  • Patent number: 5149213
    Abstract: 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 strike. The back stopper is provided with openings so that when an armature strikes the back stopper, upon withdrawal from the print strike, the noise emanated from the back stopper is reduced. A sound dampening piece may be abutted to the rear of the back stopper to further reduce the noise.
    Type: Grant
    Filed: April 29, 1991
    Date of Patent: September 22, 1992
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Hitoshi Yoshida, Katsuhiko Yokoi
  • Patent number: 5121811
    Abstract: 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 sheet delivery opening, and the hollow duct is oriented such that a noise outlet thereof is opened towards the upper surface of the sheet guiding-receiving member.
    Type: Grant
    Filed: January 19, 1990
    Date of Patent: June 16, 1992
    Assignee: Bridgestone Corporation
    Inventors: Hiroshi Shima, Masanori Murase, Naotaka Tomita, Kazuyoshi Iida
  • Patent number: 5069566
    Abstract: 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-shaped end members have legs for disposition in the striker body recesses. The wall surfaces of the striker body and legs of the members are spaced to provide a gap into which dampening material is provided. The gaps at each end of the striker bar assembly are of identical width in a front-to-back direction.
    Type: Grant
    Filed: July 6, 1990
    Date of Patent: December 3, 1991
    Assignee: Genicom Corporation
    Inventor: Fred O. Stephens
  • Patent number: 5046874
    Abstract: 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 print head also may incorporate a microphone as part of its assembly and/or construction. This improved print head when used with appropriate electronic processing can effectively attenuate the noise generated in the vicinity of the print head. In one embodiment, acoustic energy sensed by the microphone will then pass through processing electronics and be reproduced as a canceling signal by the speaker. Because of the high frequency content of the print head's acoustic output, the close proximity of the speaker to the noise producing components of the print head permits active sound attenuation technology to be applied to high frequency noise with approximately 2" or shorter wavelengths.
    Type: Grant
    Filed: March 13, 1990
    Date of Patent: September 10, 1991
    Inventor: James S. St. Clair
  • Patent number: 5040912
    Abstract: 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 access to an interior of the body and a closed position prohibiting access to the interior of the body. The recording medium can be fed into and drawn out of the body through an upper opening formed in the top cover. An inner surface of the shutter serving as a guide surface for the recording medium is exposed directly to the interior of the body when the top cover assembly is in the closed position. The shutter extends from a position adjacent the upper opening to a position adjacent the rear opening through a lower surface of a rear wall of the top cover. The shutter is movable relatively to the top cover between an open position opening the upper opening and a closed position closing the upper opening.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: August 20, 1991
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Michio Koizumi, Yasuo Iwata, Kimihiro Kosugi, Kouzou Abe
  • Patent number: 5033892
    Abstract: 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 swingable about its rear end. Projection portions are formed at opposite sides of the upper surface of the shelf. The cover is swingable about its rear end and an opening having a given width is formed between the rear end of the shelf and the front end of the cover such that when the cover and the shelf are opened, the projection portions engage the front end of the cover to maintain the cover and the shelf in an open state.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: July 23, 1991
    Assignee: Seikosha Co., Ltd.
    Inventors: Kiyoshi Fujii, Kenichi Tsumuraya
  • Patent number: 4968164
    Abstract: 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 against the printing cylinder. An advancing device upstream of the printing device serves to advance the print medium and a tensioning device downstream of the printing devices tightens the print medium against the printing cylinder. The tensioning device includes two contra-rotating rollers having substantially smooth outer surfaces in contact from opposite sides of the print medium which allow sliding at the contacting surfaces and which provide for tensioning of the print medium on the print cylinder. The rollers are of the same diameter and are both motorpowered and driven at the same rotational velocity, which rotational velocity is greater than the advance velocity of the advancing device.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: November 6, 1990
    Assignee: Societe d'Applications Generales d'Electricite et de Mecanique Sagem
    Inventors: Guy Chevrollier, Olivier Dardenne, Jean M. Ciccone
  • Patent number: 4943173
    Abstract: 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 arranged in the feeding path. The resonator has a case defining a resonant chamber and holes formed on the case along with the feeding path. The resonant chamber communicates with the feeding path through the holes. Noises such as impact sound generated by a printing head of the printer are silenced by the resonator at frequencies around a resonance fequency of the resonator, and further silenced by the area reduced portion of the feeding path.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: July 24, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoji Okazaki, Yukami Nitta, Shigeyoshi Harada
  • Patent number: 4920237
    Abstract: 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 the contact switches formed by the pairs of opposed contact pads, thus reducing the acoustic noise and improving the contact bounce characteristic.Optionally, printed expanding ink is also used to form the spacer (5) between the membranes (1 and 2).
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: April 24, 1990
    Assignee: International Business Machines Corporation
    Inventors: Richard A. Eardley, Brian J. Keenan, Ian A. Lawson, John McAllister
  • Patent number: 4758103
    Abstract: 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 the stored data and the number of dots to be printed simultaneously is reduced by logically allocating the data in each slice among complementary submatrices. Each submatrix of data is printed substantially aligned with each other submatrix in two passes of the print head across the print medium to represent the entire selected slice of data. Noise reduction is achieved by reducing the number of data dots simultaneously printed at each print location.
    Type: Grant
    Filed: April 15, 1986
    Date of Patent: July 19, 1988
    Assignee: International Business Machines Corporation
    Inventors: Tim V. Angst, Mark E. Bunke, Phuc K. Do, Nicholas J. Krull, Demetrios Troupes, Carol E. Wyke
  • Patent number: 4747717
    Abstract: 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 web is conducted in a gap, tapering in the direction of paper advance, between the conductor members and out of the printer. In a second position of the conductor members, a rectangular opening is formed behind the members, making the paper web accessible for feeding into a tractor feeder of the push-pull traction feed type.
    Type: Grant
    Filed: September 15, 1987
    Date of Patent: May 31, 1988
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Leif H. Andersson
  • Patent number: 4737046
    Abstract: 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 and integrally formed on either the outer surface of the axle part, on the inner surface of the external tube part or on both the outer surface of the axle part and the inner surface of the external tube part. Striking sounds generated as the platen roll core member is struck from outside make irregular reflections within a cavity of the core member due to the plurality of projections which results in quieter operation of the platen roll.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: April 12, 1988
    Assignee: Inabota Techno Loop Corporation
    Inventor: Yoshiko Inabata
  • Patent number: 4723857
    Abstract: 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 on a plastic subframe. The subframe is provided integrally with channel-shaped reinforcing members extending parallel to the platen at front and rear end portions of the subframe. Each reinforcing member is formed integrally with a number of reinforcing ribs arranged at regular intervals in the longitudinal direction of the member. The subframe is mounted, at its front and rear end portions, on a main frame. For the mounting arrangement, engaging projections are formed on the rear end portion so that they can substantially horizontally engage mounting recesses in the main frame with the aid of vibration-proof rubber members.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: February 9, 1988
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Takeshi Yokoi
  • Patent number: 4678355
    Abstract: 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 impacting element including a sensor thereon for generating a signal indicative of the initiation of the contact period.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: July 7, 1987
    Assignee: Xerox Corporation
    Inventors: Andrew Gabor, John C. Dunfield, George W. Bowers, Jr., Richard G. Crystal
  • Patent number: 4620810
    Abstract: 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 entrance of the printer, and does not cause inconvenience to sending of the paper.
    Type: Grant
    Filed: September 4, 1984
    Date of Patent: November 4, 1986
    Assignee: Janome Sewing Machine Co. Ltd.
    Inventors: Susumu Hanyu, Hideaki Takenoya, Kazuyuki Saiki
  • Patent number: 4526489
    Abstract: 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 rotatably away from the case body. The end of the paper shelf is located in the vicinity of the opening, and spaced apart from the case body and the cover only to the extent required for the passage of the paper to be printed and the printed paper. The top surface of the case body has at least one projection extending transversely of the paper to be printed. The paper shelf has a lower surface facing the top surface of the case body and formed with at least one projection extending transversely of the paper to be printed. This projection is spaced apart from the projection on the case body longitudinally of the paper to be printed.
    Type: Grant
    Filed: February 10, 1984
    Date of Patent: July 2, 1985
    Assignee: Seikosha Co., Ltd.
    Inventors: Kenichi Tsumuraya, Toshiaki Furuya
  • Patent number: 4465390
    Abstract: 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 friction roller located between the incoming and outgoing portions of the paper strip, during printing the roller being pulled by tensile stress in a paper against wall portions on the outer side of the housing.
    Type: Grant
    Filed: April 4, 1983
    Date of Patent: August 14, 1984
    Assignee: U.S. Philips Corporation
    Inventor: Hendrik J. Zander
  • Patent number: 4453848
    Abstract: 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 extending the length of the cylinder. The walls include a plurality of vanes disposed at angular intervals about the hub, each vane extending (a) from the hub to the inner surface of the cylinder and (b) along the length of the cylinder, each pair of adjacent vanes defining one of the longitudinal channels. It is believed that the vibrations generated along the longitudinal channels are at a frequency above the audible range, thereby resulting in reduced undesired noise when printing elements strike the platen.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: June 12, 1984
    Assignee: Florida Data Corporation
    Inventors: James W. Adkisson, Paul A. Ishman
  • Patent number: 4431324
    Abstract: 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 to the take-up reel while traveling over a guidance path having a first portion located outside of the housing and a second portion located inside the housing and extending between the first portion and the take-up reel, the housing being provided with an entrance opening located between the first and second portions of the guidance path for the passage of the ribbon into the housing, and the cartridge further including guide elements located for guiding the ribbon along the second path portion and a transport roller located along the second path portion for transporting the ribbon to the take up reel, the base plate is provided with recesses for damping noise generated during operation of the machine, and the cartridge is constructed for preventing particles
    Type: Grant
    Filed: December 11, 1981
    Date of Patent: February 14, 1984
    Assignee: Olympia Werke AG
    Inventors: Alfred Keiter, Bernd Tappehorn
  • Patent number: 4410291
    Abstract: 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 (24) around the zone where the impression is performed thus considerably reducing the noise and vibration generated by the printing support vibrations during the printing.Preferably, the leaf is provided with a window (45) wherein the impression is performed in order to press the printing support against the platen all around the print zone. As the leaf is transparent, it does not preclude the visibility of what is printed. Besides, as the leaf is mounted on the carriage, when the carriage is in its travel position, the leaf does not interfere with the loading of the printing support in the printer.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: October 18, 1983
    Assignee: Honeywell Information Systems Italia
    Inventor: Marcello Speraggi
  • Patent number: 4318452
    Abstract: 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 exterior, generally flat surface of the block so as to be completely separated from adjacent surfaces of the support wall by a region of block material. The metal strip is arranged to receive the impact of type bars and other noise-inducing mechanical force elements of the printer. The noise emanating from such impacts are dampened as they travel through the block material. There is no direct connection between the metal strip and the housing of the mechanical printer in order to prevent direct transmission of noise vibrations from the strip to the housing.
    Type: Grant
    Filed: September 25, 1980
    Date of Patent: March 9, 1982
    Assignee: Siemens Aktiengesellschaft
    Inventor: Wilhelm Reitner
  • Patent number: 4247213
    Abstract: A noise-reducing hollow platen having a hard external tube filled with steel or lead spheres.
    Type: Grant
    Filed: May 2, 1977
    Date of Patent: January 27, 1981
    Assignee: U.S. Philips Corporation
    Inventor: Horst Wurscher
  • Patent number: 4215946
    Abstract: 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 at other positions than the printing face of a platen or at the inside of a type drum in the impact type printing mechanism, and in which elastic vibration absorbing materials are packed in close contact with the vibration members, so that noise attendant with the printing hammer impact can be effectively attenuated.
    Type: Grant
    Filed: January 27, 1978
    Date of Patent: August 5, 1980
    Assignee: Kokusai Denshin Denwa Kabushiki Kaisha
    Inventors: Satoru Nakabo, Tasaku Wada, Kazumasa Mihira
  • Patent number: 4197024
    Abstract: 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 depressing portions of the paper deeply into engagement with the resilient roller to enable the resilient roller to damp acoustical energy traveling along the length of the paper.
    Type: Grant
    Filed: November 30, 1977
    Date of Patent: April 8, 1980
    Assignee: Teletype Corporation
    Inventor: Francis E. Huntoon