Abstract: A serial recording apparatus is disclosed which is capable of continuously printing even if a dot-forming element (or elements) of the element array of the recording head is defective, by substituting for the defective dot-forming element, a substitution dot-forming element. The serial recording apparatus also automatically detects a defective dot-forming element of the element array of the recording head. In operation, print data of the defective dot-forming element, which loses its dot-forming function, is saved in a second print-data storing device, and a first printing pass is carried out. In the second printing pass, a normal dot-forming element is moved to a location on a recording sheet which would otherwise be subjected to printing by the defective dot-forming element, and reads out the print data from the second print-data storing device to print it on that location.

Abstract: Disclosed are a magnetic circuit component of an impact dot head and a molding method thereof by which the number of parts is reduced, and an excellent magnetic efficiency is exhibited.At least one member among a plurality of members constituting a magnetic circuit component (e.g., a core block 1) of a printing head is injection-molded after kneading a binder with metallic powder of a magnetic substance. The single member is sintered by joining it to another molded member after effecting de-binder processing, thus manufacturing the component.

Abstract: A serial printer having a dot type printing head for printing on a paper. The printer includes 2N columns of dot forming elements where N is a positive integer equal to 2 or more and a carriage supported on the printer for reciprocal movement across the paper in a carriage direction. The columns of dot forming elements are supported on the carriage for selectively printing dots on a paper. Each column of the dot forming elements is spaced a predetermined distance from adjacent columns of the dot forming elements in the carriage direction. Each dot forming element column includes a plurality of dot forming elements arranged in a line and spaced apart from one another in the column direction by a dot pitch substantially equal to N. A drive system selectively drives selected dot forming elements in each column of dot forming elements by one of an even number timing and an odd number timing.

Abstract: An impact printer having a platen, an impact printing member such as a printing wire, a driver such as a driving coil for driving the impact member, a controller for controlling the driver and a temperature detector. Before printing data is printed, the temperature detector compares the temperature of the printer to a set point. If the temperature is too low, a warm-up signal is provided and the driver displaces the printing member to such an extent that printing does not occur. The warm-up signal can also cause the gap between the platen and the printing member to widen to such an extent that printing cannot occur.

Abstract: A drive circuit for a wire dot print head including a driving coil, a print lever attracted by the coil in a first direction, a spring for biasing the print lever in a second opposite direction and a damper includes a DC power source connected to a first end of the driving coil. A transistor is connected to the second end of the driving coil. An output circuit provides a gated output to the transistor. The output circuit receives as a first input a print data signal and as a second input a signal from a reference timing signal generator. The reference timing signal generator includes a drive pulse signal generator which provides an output in response to a print timing pulse which causes the output circuit to provide an output for the driving coil to attract the print lever.

Abstract: An impact printer having a platen, an impact printing member such as a printing wire, a driver such as a driving coil for driving the impact member, a controller for controlling the driver and a temperature detector. Before printing data is printed, the temperature detector compares the temperature of the printer to a set point. If the temperature is too low, a warm-up signal is provided and the driver displaces the printing member to such an extent that printing does not occur. The warm-up signal can also cause the gap between the platen and the printing member to widen to such an extent that printing cannot occur.