JP4702039B2 - Shuttle control method for printing apparatus - Google Patents

Description

  The present invention relates to a printing apparatus having a linear motor type shuttle mechanism, and more particularly to a reciprocation control method of a shuttle mechanism of a linear motor provided with a reversal urging means for urging reversal of reciprocation. is there.

  In a printing device that has a linear motor type shuttle mechanism and reciprocates a hammer bank equipped with a plurality of printing elements (dot printing hammers, etc.) with this shuttle mechanism, in order to improve the printing speed, when the hammer bank is reversed A shuttle mechanism having a reverse biasing means using a repulsive force such as a spring has been developed.

  FIG. 2 shows an example of the configuration of a linear motor type shuttle mechanism provided with a reverse biasing means.

  The hammer bank 10 on which a plurality of printing elements are mounted is supported by the linear motion bearing 12 and reciprocates on the guide shaft 11. The linear motor unit 20, which is a power source for reciprocating operation, includes at least a coil 21 and a magnet 24, and the coil 21 generally includes an inversion coil 22 and a constant velocity coil 23. The hammer bank 10 and the coil 21 are connected to at least one timing belt 31, and a shuttle operation is possible by the power from the linear motor unit 20 by the reversing mechanism unit 30 constituted by at least one pair of supported timing pulleys 32. It is configured as follows. Further, at both ends of the hammer bank 10 or the coil 21, reverse biasing means (for example, springs) 40 are disposed at positions for biasing the reverse. The reverse biasing means 40 is not limited to a spring, and may be a means using the same-polar repulsion of a magnet.

  In the reciprocating reciprocation of the hammer bank 10 and the coil 21, the position detection sensor 50 attached to the movable part calculates the position and reciprocating speed of the hammer bank 10 and operates on a predetermined reciprocating speed curve. . The control is performed by a shuttle control circuit 60 that changes the value of the current supplied to the coil 21, a thermistor 61 that detects the operating environment temperature, and a shuttle drive circuit 70 that supplies current to the coil 21.

  The printing paper is mounted facing the hammer bank 10 and is conveyed by a paper feeding means (not shown). In the course of the reciprocating operation of the hammer bank 10, printing is performed by driving the printing element toward the printing paper via the ink ribbon.

  Next, the hammer bank speed waveform and coil drive current of the linear motor shuttle mechanism are shown in FIG. In FIG. 3, the shuttle operation of the hammer bank 10 is divided into an inversion section and a constant speed section as shown in the speed waveform. In the reversal section, the reversing coil 22 is energized to perform deceleration control and acceleration control so as to maintain the set average acceleration of the reversing section. In the constant speed section, the constant speed coil 23 is energized to move at a constant speed, etc. Speed control is performed.

  When a section in which the biasing force by the reverse biasing means is applied (hereinafter referred to as a biasing section) overlaps with the constant speed section, it occurs in a direction opposite to the biasing force or repulsive force in order to stabilize the speed of the constant speed section. 2. Description of the Related Art A printing apparatus having a control for energizing a coil with a drive current has been developed (see, for example, Patent Document 1). The coil drive current in FIG. 3 is an example of the drive current by the control. The left biasing section by the reverse biasing means is defined as position X1 to the left reverse position XL to position X1, and the right biasing section is defined as position X2 to the right reverse position XR to position X2. Among the urging sections, a repulsive force acts on the deceleration section side and a urging force acts on the acceleration section side with a reversal position (intersection with the horizontal axis of the graph) as a boundary.

  In order to increase the speed stability of the constant speed section, inversion in the second half of the acceleration section and the first half of the constant speed section (position accelerated to speed V1 to position X1, position accelerated to speed -V1 to position X2) Apply a suppression current to the coil. As a result, the urging force can be canceled, and it is possible to prevent the speed in the first half of the constant velocity section from being exceeded.

  On the other hand, in the latter half of the constant speed section (position X2 to position X3, position X1 to position X0), a speed increasing current is supplied to the reversing coil. As a result, the repulsive force can be canceled out, and the speed reduction in the latter half of the constant velocity section can be prevented.

Japanese Patent No. 3620627

  In the field of this apparatus, high-speed and high-quality printing is always required, and it is essential to shorten the shuttle cycle.

  For this reason, if the reversing coil is energized on average throughout the reversing section in order to increase the average acceleration in the reversing section consisting of the deceleration section and the acceleration section, the force to maintain the acceleration for several ms immediately after the end of the acceleration section. Because it works (it depends on the mass and load of the shuttle mechanism), it causes excessive speed and fluctuations in the first half of the constant velocity part. Further, in the control of the first half of the constant speed section, the suppression current for suppressing the overspeed is increased, which causes problems such as increase in power consumption and heat generation of the motor. This problem becomes even more serious in a speed mode in which a section in which a biasing force by a reverse biasing unit acts on a constant speed section in a printing apparatus having several types of printing speed patterns.

  The present invention prevents high speed in the first half of the constant speed section while maintaining high acceleration in the hammer bank reversal section, and performs stable high-speed reciprocating movement of the shuttle with the minimum necessary drive current to improve printing speed. Is an issue.

The invention according to claim 1, which solves the above problem, includes a hammer bank having a plurality of printing elements mounted thereon, and at least a magnet , a reversing coil, and a constant velocity coil, and the hammer bank is divided into a reversing section and a constant speed section. made with reciprocally moved by the shuttle operation, have a shuttle mechanism of the linear motor system having a reversing biasing means for biasing the reversal of the reciprocating motion of the hammer bank at near both ends of the amplitude of said hammer bank, the inverting coil In a printing apparatus that performs acceleration / deceleration control in the inversion section by supplying a drive current to the constant speed coil and performs constant speed control in the constant speed section by supplying drive current to the constant speed coil, the average acceleration in the inversion section is calculated. In order not to change, the energization to the reversing coil in the deceleration section in the reversing section is increased, and the acceleration section in the reversing section is passed to the reversing coil. Characterized in that to lose weight.

The invention according to claim 2, which solves the above-mentioned problem, has a hammer bank on which a plurality of printing elements are mounted, and at least a magnet , an inversion coil, and a constant velocity coil, and the hammer bank is divided into an inversion interval and a constant velocity interval. made with reciprocally moved by the shuttle operation, have a shuttle mechanism of the linear motor system having a reversing biasing means for biasing the reversal of the reciprocating motion of the hammer bank at near both ends of the amplitude of said hammer bank, the inverting coil In a printing apparatus that performs acceleration / deceleration control in the inversion section by supplying a drive current to the constant speed coil and performs constant speed control in the constant speed section by supplying drive current to the constant speed coil, the average acceleration in the inversion section is calculated. In order not to change, the energization to the reversing coil in the deceleration section in the reversing section is increased, and the acceleration section in the reversing section is passed to the reversing coil. Together to lose weight, and performing monitoring to feedback control a thrust reduction of the shuttle mechanism during the shuttle operation.

The invention according to claim 3 for solving the above-mentioned problem has a hammer bank on which a plurality of printing elements are mounted, and at least a magnet, an inversion coil, and a constant velocity coil, and the hammer bank is divided into an inversion zone and a constant velocity zone. A linear motor type shuttle mechanism having reversal urging means for urging reversal of the reciprocating motion of the hammer bank in the vicinity of both ends of the amplitude of the hammer bank. In a printing apparatus that performs acceleration / deceleration control in the inversion section by supplying a drive current to the constant speed coil and performs constant speed control in the constant speed section by supplying drive current to the constant speed coil, the average acceleration in the inversion section is calculated. In order not to change, the energization to the reversing coil in the deceleration section in the reversing section is increased, and the acceleration section in the reversing section is passed to the reversing coil. Together to lose weight, and performing to feedback control monitors the operating environment temperature during the shuttle operation.

According to a fourth aspect of the present invention for solving the above problem, in the second or third aspect of the present invention, in the feedback control, the current value of the drive current energized in the reversing coil is set to a deceleration section and an acceleration section of the reversing section. It is characterized by selecting whether to make it different or equivalent .

  According to the present invention, the acceleration in the inversion section can be increased with a minimum driving current, and the printing speed can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  Since the configuration of the shuttle mechanism is the same as that of the background art, description thereof is omitted. FIG. 1 shows an example of the velocity waveform of the hammer bank and the current waveform of the reversing coil in the low speed mode in the present invention, and FIG. 5 shows an example of feedback processing of the acceleration / deceleration current during operation in the present invention. An embodiment of a current profile creation method for an inversion section and a feedback method for an acceleration / deceleration current energized in the inversion section during operation will be described with reference to FIGS.

  First, in order to create a basic profile of the driving current in the inversion section, adjustment is performed to increase the energization in the deceleration section and reduce the energization in the acceleration section so as not to change the average acceleration in the inversion section. As a result, the acceleration force decreases and the speed at the start of the constant velocity section decreases, so that the suppression current is reduced and adjusted so as to follow the ideal constant velocity. As shown in the urging section for each printing speed setting in FIG. 4 and the coil drive current waveform, the mechanism does not overlap the urging section with the constant speed section in the high speed mode. Since it becomes smaller, it may be adopted as necessary for each printing mode.

  Next, during operation, the motor thrust drop due to heat generated during continuous operation is monitored, and the current value to be fed back is, for example, 1.0 A added to the deceleration zone and 0.5 A added to the acceleration zone. There is also a method of selecting this feedback according to the operating environment temperature. For example, the operating environment temperature is detected by a thermistor on the board, and this feedback is generally used at low temperatures when the thrust is large, and equivalent current feedback is performed in the inversion section at high temperatures when the thrust is small. is there. It should be noted that there is a possibility that the load of the shuttle mechanism increases at low temperatures and the thrust becomes insufficient, and a method suited to the device should be taken. A method of selecting feedback according to the operating environment temperature may be adopted in a printing mode as necessary.

The figure which shows the speed waveform of the hammer bank at the time of the low speed mode in this invention, and the current waveform of an inversion coil. The schematic side view which shows an example of the shuttle mechanism using a linear motor. The figure which shows the speed waveform and coil drive current waveform of a hammer bank in a prior art. The figure which shows the energizing area according to printing speed setting, and a coil drive current waveform. The flowchart which shows the feedback process of the acceleration / deceleration electric current at the time of shuttle operation in this invention.

Explanation of symbols

10 is a hammer bank, 11 is a guide shaft, 12 is a linear bearing, 20 is a linear motor section, 21 is a coil, 22 is a reversing coil, 23 is a constant speed coil, 24 is a magnet, 30 is a reversing mechanism section, and 31 is timing. A belt, 32 is a timing pulley, 50 is a position detection sensor, 60 is a shuttle control circuit, 61 is a temperature detection circuit, and 70 is a shuttle drive circuit.

Claims (4)

A hammer bank having a plurality of printing elements and at least a magnet , a reversing coil, and a constant speed coil, and reciprocating the hammer bank by a shuttle operation comprising a reversing section and a constant speed section . have a shuttle mechanism of the linear motor system near the ends of the amplitude with a reversing biasing means for urging the reversal of reciprocation of said hammer bank, acceleration and deceleration of the reversing section by the drive current to the inverting coil In a printing apparatus that performs control and performs constant speed control of the constant speed section by energizing the constant speed coil with a drive current, the speed of the deceleration section in the reverse section is not changed so as not to change the average acceleration of the reverse section. increasing the amount of energization of the reversing coil, a printing apparatus, characterized in that for reduction of the current supply to the inverting coil of the acceleration section in the reversing section Yatoru control method. A hammer bank having a plurality of printing elements and at least a magnet , a reversing coil, and a constant speed coil, and reciprocating the hammer bank by a shuttle operation comprising a reversing section and a constant speed section . have a shuttle mechanism of the linear motor system near the ends of the amplitude with a reversing biasing means for urging the reversal of reciprocation of said hammer bank, acceleration and deceleration of the reversing section by the drive current to the inverting coil In a printing apparatus that performs control and performs constant speed control of the constant speed section by energizing the constant speed coil with a drive current, the speed of the deceleration section in the reverse section is not changed so as not to change the average acceleration of the reverse section. The energization to the reversing coil is increased, the energization to the reversing coil in the acceleration section in the reversing section is decreased, and the shuttle operation is in progress Shuttle control method for a printing apparatus, characterized in that for monitoring and feedback control of the thrust reduction of said shuttle mechanism. A hammer bank having a plurality of printing elements and at least a magnet, a reversing coil, and a constant speed coil, and reciprocating the hammer bank by a shuttle operation comprising a reversing section and a constant speed section. A linear motor type shuttle mechanism having a reverse biasing means for biasing the reversal of the reciprocating motion of the hammer bank in the vicinity of both ends of the amplitude, and energizing the reverse coil with a drive current to accelerate / decelerate the reverse section In a printing apparatus that performs control and performs constant speed control of the constant speed section by energizing the constant speed coil with a drive current, the speed of the deceleration section in the reverse section is not changed so as not to change the average acceleration of the reverse section. The energization to the reversing coil is increased, the energization to the reversing coil in the acceleration section in the reversing section is decreased, and the shuttle operation is in progress Shuttle method for controlling the printing device and performing to feedback control monitors the operating environment temperature. Wherein the feedback control, the current value of the drive current supplied to the inverting coil of claim 2 or 3, wherein the selecting whether to equal or be different in the deceleration section and the acceleration section of the inversion interval A shuttle control method for a printing apparatus.

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