Recorders – Printing – dotting – or punching marker
Patent
1981-09-16
1984-02-21
Goldberg, E. A.
Recorders
Printing, dotting, or punching marker
346141, G01D 1502
Patent
active
044333390
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Field of the Invention
The invention relates to an electrical measuring instrument, and more particularly, to a direct-writing recorder of dot type in which the location of a pointer corresponding to an input electrical quantity is intermittently printed on a record paper which moves stepwise below the pointer. 2. Description of the Prior Art
A continuous pen recorder suffers from a poor response of a pointer carrying a pen because of the increased magnitude of friction occurring between the pen and a record paper. By contrast, the problem of such friction is substantially eliminated in a recorder of the dot type since the record paper moves stepwise and dots are periodically printed during the time the record paper remains stationary. However, with the conventional recorder of the dot type which utilizes a drop frame, the period of dot printing cannot be reduced, resulting in a degraded measuring resolution. Accordingly, such recorder is inappropriate for use with the measurement of a quantity which undergoes a rapid variation. A typical example of a dot printing recorder the of drop frame type is illustrated in FIG. 1. An instrument unit 1 including a moving coil is provided with a pointer 2, the free end 6 of which is movable over a scale 5 in the similar manner as a usual indicating instrument. A record paper 8 is placed below the pointer 2, and is stepwise fed by a feeder 10 at a given time interval. A portion of the pointer 2 adjacent to the free end 6 is provided with a needle-shaped printing element 7 which is located opposite to the surface of the record paper 8 with an ink ribbon 9 interposed therebetween. A drop frame 3 is disposed above the pointer 2 and is sized sufficiently to cover the full extent of deflection of the pointer 2. The frame 3 is connected to a drive shaft 4, which undergoes an angular movement in response to a drive from an electric motor, not shown, thereby causing a vertical movement of the frame 3 at a given time interval to impact the printing element 7 against the record paper 8 through the interposed ink ribbon 9. When the operating cycle of the drop frame 3 is increased in the dot recorder of the type described, the pointer 2 is subject to a severe oscillation, and since it is clamped between the frame 3 and the record paper 8 upon each impact, it is difficult to maintain an accurate location which corresponds to the input electrical quantity. At the current status of art, commercially available products have a dot printing period which is on the order of about one second at minimum.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a direct-writing recorder of the dot type which has a reduced dot printing period and a high resolution.
It is another object of the invention to provide a direct-writing recorder of the dot type having an improved response to a rapid change in an input being measured.
The direct-writing recorder of the dot type according to the invention is characterized in that an area of a record paper on which an imprint is to be formed is subject to an oscillation in a direction perpendicular to the plane of the paper at a given time interval for periodic contact with a printing element on a pointer. To realize such operation, a vibrator is disposed below the printing element and urges the record paper against the printing element as the paper passes through a printing station which comprises the vibrator and the printing element.
In a preferred embodiment of the invention, the printing station is constructed according to the principle of a discharge recording technique, and accordingly the record paper comprises a usual discharge recording paper. In accordance with such principle, the printing element on the pointer comprises a discharge electrode while the printing station is provided with a counter electrode. As the discharge recording paper moves into contact with the discharge electrode in response to a drive imparted thereto from the vibrator, a voltage applied across both electrodes causes a breakdown of a co
REFERENCES:
patent: 1521007 (1924-12-01), Chubb
patent: 2433382 (1947-12-01), Marrison
patent: 4042936 (1977-08-01), Yoshikawa
patent: 4178600 (1979-12-01), King
patent: 4205323 (1980-05-01), Williams et al.
Adams Bruce L.
Burns Robert E.
Goldberg E. A.
Hioki Denki Kabushiki Kaisha
Jennings D.
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