Graphtec Kabushiki Kaisha

Isamu Aizawa

Information is recorded with one or more elongate thermal recording heads on a recording medium advancing at least intermittently on a recording medium support. Such recording head or heads are being pressed against the recording medium at the recording medium support by at least two biasing devices spaced along such elongate thermal recording head or heads. These two biasing devices are balanced relative to each other opposite the elongate thermal recording head or heads, as seen from the recording medium support. Different characteristics of the biasing devices are thus compensated opposite the elongate thermal recording head or heads, as seen from said recording medium support. Forces acting at one end of an elongate thermal recording head, or acting on one of the recording heads, against either of the biasing devices are transmitted via both biasing devices to an opposite end of that elongate thermal recording head or to the other of two elongate thermal recording heads. Movements of the recording medium support at either end of one elongate thermal recording head, or at one of the recording heads, are transmitted via the biasing devices to an opposite end of that elongate thermal recording head or to the other of two elongate thermal recording heads for perfect balance.

Balanced head suspension in thermal recorders

In a thermal recording apparatus using a plurality of thermal heads supported by a head supporting means including a head supporting mechanism and a head pressing mechanism. The head supporting means includes single supporting units provided for correspondingly respectively supporting the thermal heads. Each of the single supporting units has a pair of hook-shaped members fixed to corresponding one of the thermal heads at two places of the rear surface thereof, and has a head supporting member having a pair of side end portions corresponding to the pair of hook-shaped members and a plane portion formed between the pair of side end portions and fixed to a rotatable pillar-shaped member. The head supporting member is engaged at its side end portions with the respective hook-shaped members so as to be movable in the vertical and rotational directions. The head pressing mechanism has a pair of compression springs for pressing the rear surface of each of the thermal head at a symmetric position, a pair of movable members for correspondingly respectively keeping the thermal heads through the compression springs, and a common movable member for arranging the pair of movable members on one straight line and for keeping the pair of movable members each other at symmetric positions.

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Fujisawa, Japan

Isamu Aizawa