JP2003182178A - Shuttle control method for dot line printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of prior art shuttle control that a possibility of deteriorating the print quality or stepping out a motor is present because temperature variation in the printer causes operation with a driving profile different from an actual shuttle driving. <P>SOLUTION: In the inventive shuttle control, driving profiles are provided for respective temperature conditions and a currently driving profile is replaced by a specified driving profile when a specified temperature is reached. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a shuttle control method for a dot line printer which performs printing in a dot matrix format by using a dot printing print hammer. 2. Description of the Related Art The printing principle of a dot line printer will be described with reference to FIG. A hammer bank 1 having a plurality of printing hammers (not shown) is connected to a hammer block 2,
It is supported by a shaft via a linear bearing. Also, a counter balancer 3 driven in a phase opposite to that of the hammerbank 1
Similarly, it is supported by a shaft via a linear bearing. One end of each of the two cranks 4 is connected to the hammer block 2 and the counter balancer 3, and the other end is connected to a shaft of a stepping motor 5. The motor is driven by exciting the stepping motor 5, and the two cranks 4 are arranged with a phase shift of 180 °. Therefore, the hammer bank 1 and the counter balancer 3 reciprocate in the opposite phases. I do. The stepping motor 5 is fixed to the frame 8 via a rubber damper for suppressing vibration. A sensor 7 is attached to the hammer bank 1. When the hammer bank 1 moves, a signal is output at regular intervals, and a printing control device drives the printing hammer pin via a shuttle control unit, and an ink ribbon is provided. The printing is performed at a predetermined position on the printing paper 9 via the. The rotation of the hammer bank 1 is started at a position where the crank 4 is rotated 180 ° from the rotation start position at a position where the distance between the center position of the crank and the center of the stepping motor shaft and the center distance of the crank 4 is maximum on the horizontal axis. The printing of the minute ends. Then, the above operation is reversed, and the moving direction of the hammerbank 1 is reversed. Meanwhile, the printing paper 9 is transported by a predetermined amount by the pair of paper transport tractors 6 driven by the paper transport motor, and printing of the next stroke is started. The stepping motor 5 is driven by using a speed control program (hereinafter, referred to as a drive profile) for one half turn or one turn in order to drive with a target speed waveform by the shuttle of the dot line printer configured as described above. It is common. Since the position of the hammerbank 1 can be detected by the output of the sensor signal, the driving profile is
It starts when the hammerbank recognizes that it has reached a predetermined position. The driven shuttle keeps driving until a stop command is received from the control unit. At the time of continuous driving, heat is generated by excitation of the stepping motor 5 and the hammerbank 1 and the like, and the temperature inside the machine rises. In the present invention, the machine means a housing of a dot line printer. Since the phase difference between the motor rotor and the stator changes due to the change in the hardness of the vibration damping rubber damper to which the stepping motor 5 is attached due to the temperature change of the driving part, the angular velocity of the motor partially increases. Change. Therefore, the driving of the shuttle differs from the originally intended driving, and the speed waveform changes. The change in the speed waveform becomes larger as the shuttle drive speed increases. If the fluctuation of the speed waveform exceeds the shuttle speed calculated from the time from when the hammer pin starts to return until the hammer pin returns, the hammer pin cannot be printed, and printing missing (dot removal) occurs. Also, since the print dots are printed with the shuttle speed predicted in advance, if the fluctuation amount of the speed waveform is large, it will not be possible to print at the target position. to degrade. Further, there is a possibility that the actual shuttle drive operation does not match the drive profile, the motor loses synchronism, and the shuttle drive cannot be continued. As described above, in the conventional shuttle control, since the actual shuttle drive and the drive profile operate differently due to a change in the temperature inside the apparatus, the print quality deteriorates and the motor is disconnected. Tones could occur. According to the present invention, there is provided a hammer bank having a plurality of printing hammers, a counter balancer operating in an opposite phase to the hammer bank, and A shuttle for interlocking the bank and the counter balancer, a stepping motor for rotating the crank, and a shuttle for reciprocating the hammer bank and the counter balancer each including a vibration damping rubber damper connected to the stepping motor. Using a dot line printer equipped with a mechanism, the motor speed control program is switched according to the temperature change in order to prevent shuttle drive fluctuation due to a temperature change inside the machine. FIG. 1 shows a flow chart of the present invention. The flowchart of FIG. 1 is a diagram showing the steps from turning on the power of the machine to driving the shuttle. The temperature range can be divided without limitation, but if the temperature range is divided too finely, the drive profile is required for the number of divisions. It is necessary to set the number of divisions within a range where the memory capacity of the control unit is allowable. This time, it is assumed that the drive temperature is set by dividing it into four. After turning on the aircraft power, the mechanical drive of the aircraft and the initial check of the control unit are performed, the ambient temperature inside the aircraft is detected,
Select an appropriate profile for the divided temperature range and drive the shuttle. After the shuttle drive, the temperature inside the machine is always detected, and the temperature is changed to switch to the proper drive profile. FIG. 2 is an example showing a use drive profile range depending on a temperature change. An embodiment will be described with reference to FIG. The vertical axis in the figure indicates the temperature inside the device. Before the aircraft turns on,
When the temperature inside the aircraft is at the point A, when the aircraft power is turned on, the resistance value of the thermistor installed in the aircraft is detected, the current environmental temperature is grasped through the control unit, and the drive profile is transmitted from the control unit. Select I and perform shuttle drive. When continuous driving is performed, the stepping motor 5 and the hammerbank 1
The temperature inside the machine rises due to the heat generated from the device. When the temperature inside the aircraft reaches point B, the drive profile
Switch to II and perform shuttle drive again. Similarly, when the aircraft temperature reaches point C and point D, respectively, the drive profile II
Switch to I, drive profile IV. By creating a drive profile suitable for drive conditions in the temperature range I to IV,
The above control becomes possible. According to the actual shuttle drive,
Since the drive profiles I to IV are created, the actual shuttle drive and the drive profile match. Therefore, the print quality is stable and the motor does not step out, so that a highly reliable product can be provided. According to the shuttle control described above, the drive profile is switched according to the temperature change, so that the print quality is stable and the motor does not step out, so that a highly reliable product can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart of shuttle control according to the present invention. FIG. 2 is a diagram showing a use drive profile range according to a change in the temperature inside the machine. FIG. 3 is a perspective view illustrating a printing principle of a dot line printer. [Description of References] 1 is a hammer bank, 2 is a hammer block, 3 is a counter balancer, 4 is a crank, 5 is a stepping motor, 6
Is a tractor and 7 is a sensor.

Claims (1)

Claims: 1. A hammer bank having a plurality of print hammers, a counter balancer operating in a phase opposite to that of the hammer bank, a crank for linking the hammer bank and the counter balancer, Using a dot line printer having a stepping motor for rotating a crank, and a shuttle mechanism for reciprocating the hammer bank and the counter balancer, which are constituted by a rubber damper for vibration suppression connected to the stepping motor, A dot line printer shuttle control method characterized by switching a motor speed control program according to a temperature change in order to prevent a shuttle drive fluctuation due to a temperature change in a body.