Hitachi Koki Co., Ltd.

Hisayoshi Monma

Masao Miyasaka

Shigenobu Katagiri

Kazuyuki Kubo

Hiroomi Kozawa

A 384-character type carrier for use in a line printer coupled to a computer using a 240-character type data array of Q sets of P printable characters each. The type carrier includes K sets of characters each including P printable characters and R dummy characters, with K&gt;Q and 384=K.multidot.(P+R).

Line printer and type carrier for use therein

A line printer of the type using a 384-character type carrier receives a 240-character type data array from a computer designed for a 240-character line printer and converts the 240-character array into a 384-character data array with no partial character sets. The converted 384-character data array corresponds exactly to the characters on the type carrier. The type carrier includes a number of dummy characters in each character set if the type carrier employs other than 48-character sets.

A failure detection circuit for stepping motors having a rotor and a motor control circuit including first and second transistors respectively connected in series with first and second stator coils. The rotor is set in motion in response to energization of the second stator coil when the second transistor is activated and brought to a halt in response to energization of the first stator coil when the first transistor is activated. During the interval when the first transistor is activated, the potential at a circuit junction between the respective transistor and the associated coil is detected and compared with the logic level of the input to the associated transistor to check for a set of operational states of the circuit elements to give a warning indication if the compared levels have a predetermined relationship to each other. During the interval when the rotor is at standstill, the second transistor is activated in a brief interval so that the amount of current generated in the second stator coil is insufficient to generate a torque to the rotor and in this brief interval the above comparison is made to check for another set of operational states of the circuit elements to give a warning indication if the compared levels have a predetermined relationship therebetween.

Failure detection method and circuit for stepping motors

In a paper feed control system employing a pulse motor steppingly rotatable in response to driving pulses, paper feeding is controlled by a prepunched format tape wherein line pulses generated every one line feeding of the paper are in synchronism with perforations detected from the format tape. Briefly, the format tape is moved by the pulse motor, and when a first perforation is detected therefrom a predetermined number of the driving pulses is applied to the pulse motor, whereby the format tape is moved to an approximate midpoint of the perforation. A first line pulse is generated in response to the predetermined number of the driving pulses so that the line pulse is generated in approximate midpoint of the first perforation. Accordingly, the succeeding line pulses are generated in the approximate midpoints of the succeeding perforations.

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Katsuta, Japan

Hisayoshi Monma