Charles D Zinsmeyer, James A Parnell, Dan R Poole, Carl D Massey: Ribbon cassette for a printer. Summagraphics Corporation, Rosen Dainow & Jacobs, January 24, 1995: US05383733 (20 worldwide citation)

A cassette for ribbon for a printer, particularly a thermal printer, is disclosed. The cassette is configured to be stably mounted to a print carriage of a thermal printer, or to a storage turret mounted to the printer for storing a number of cassettes, and to be transferred by a passive transfer sy ...

James A Parnell, John C Venthem, Charles D Zinsmeyer: Ribbon cassette storage and transfer apparatus for a printer. Summagraphics Corporation, Rosen Dainow & Jacobs, December 7, 1993: US05267802 (18 worldwide citation)

Apparatus is disclosed for use with printers (or plotters) for storing and transferring ink-containing ribbon cassettes between a print head and a storage location. The printers (or plotters) are of the type which include a print head that is not as wide as the width of the medium to be printed on s ...

James A Parnell: Capacitive transducer drive mechanism for the recording pen of a graphical recorder. Bausch & Lomb Incorporated Rochester NY, Frank C Parker, Saul A Seinberg, August 8, 1972: US3683402 (18 worldwide citation)

A variable capacitive transducer is employed in a graphical recording device in conjunction with its pen drive mechanism. Two fixed conductive plates are mounted within the recorder parallel to each other and a flexible belt, partly coated with a conductive film, is movably mounted therebetween. The ...

James A Parnell, John A Massa: Digitizing system. Bausch & Lomb Incorporated, Bernard D Bogdon, September 25, 1984: US04473717 (17 worldwide citation)

One digitizer grid pattern is used for each of two coordinate axes, i.e. X and Y. Each grid pattern is used for coarse and fine digitizing to determine cursor positioning on each respective axis. Th digitizer has two basic modes of operation which relate to digitally representing the position of a c ...

Eric Silverberg, James A Parnell, Marvin L Freeman, Robert A Johnson: Plotter and aligning method. Ametek, Amster Rothstein & Ebenstein, March 29, 1988: US04734716 (14 worldwide citation)

A plotter having the capability of unattended operation incorporates several innovations. An X-axis dual motor drive mechanism moves the plotting chart through the plotter using two independently controlled motors driving respective individual friction drives at either side of the chart. An automati ...

James A Parnell: Digitizing cursor and coordinate grid system. Bausch & Lomb Incorporated, Bernard D Bogdon, John S Norton, October 23, 1984: US04479032 (13 worldwide citation)

A digitizer cursor is provided with a multifunctional control panel. The panel is comprised of a multiplicity of switches for defining various modes of cursor operation in use with a digitizer coordinate axes grid assembly or pad. Novel circuitry provides for a cursor of convenient size with a compl ...

John C Venthem, James A Parnell, Mark Hill, Dan R Poole: Pen tip position detector. Ametek, Amster Rothstein & Ebenstein, December 19, 1989: US04888710 (6 worldwide citation)

Apparatus, for use in conjunction with a digital plotter incorporating controlled multiple markers to create displays, for determining the position of the markers along axes of movement, comprises a detector assembly disposed at a fixed axial position relative to the plotter, and a driver for moving ...

James A Parnell, Dan R Poole: Digitizer for position sensing. Ametek, Amster Rothstein & Ebenstein, May 22, 1990: US04928256 (4 worldwide citation)

Apparatus and method for determining position, tilt and offset of a pointer with respect to a grid of parallel conductors with which it is coupled by obtaining measured responses between each of a group conductors and the pointer and fitting an expression for the response to said measured responses.

John C Venthem, Marlan L Schmidt, James A Parnell: Sheet medium transport system, particularly for printers and plotters. Summagraphics Corporation, Rosen Dainow & Jacobs, April 11, 1995: US05405205 (4 worldwide citation)

The invention disclosed herein provides a method and apparatus for counteracting the effects of a localized drag on a sheet medium as it is being moved by a drive system, for example, in a printer or plotter to prevent misregistration of the sheet medium with the X-axis drive system as the sheet med ...

John C Venthem, James A Parnell: Apparatus for raising and lowering plotter marking devices. Summagraphics Corporation, Rosen Dainow & Jacobs, July 26, 1994: US05333005 (1 worldwide citation)

Apparatus especially X-Y plotters having a marking device for marking a surface. A support is provided for supporting the marking device. The support is movable along an axis of the housing while the marking device can be selectively raised and lowered relative to the surface. The raising and loweri ...