JPS6097880A - Printer - Google Patents

Abstract

PURPOSE:To enable to easily perform closed loop control with high accuracy without requiring any adjustment, by a method wherein a slitted plate laminated on a bar is protruded widely beyond the width of the bar, and the protruded part is provided with feed-back controlling slits. CONSTITUTION:Stepping slits 10 and feed-back controlling slits 13 are provided in a same slitted plate 16. A carrier 6 is magnetically attracted to the slitted plate 16 laminated on a bar 4, and can be moved on the slitted plate 16 by rollers 9. The pitch of the slits 10 corresponds to the pitch of teeth 11 of an armature 12, whereby the carrier 6 is moved while being controlled by the slits 10. A carriage 8 is fixed by shafts 7, is so fitted that the slits 13 can be sensed, and a photo-sensor 15 generates a feed-back signal upon sensing the slits 13, whereby the position and the velocity of the carrier 6 can be controlled in a closed loop manner.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a printing device using a linear pulse motor used in printers, electronic typewriters, and the like.

Conventional configuration and its problems In recent years, printing bags ff1d using linear pulse motors, which are easier to maintain than rotary pulse motors or DC servo motors, and can perform direct linear motion 1. Move the carriage of the printing device. It is widely used in products such as printers and electronic typewriters due to its advantages such as a simplified mechanism. This is a printing device using a conventional linear pulse motor shown in FIGS. 1 and 2, and the printing medium l is a cylindrical plastic plate. inserted along line 2. A bar 4 of the linear pulse motor is fixed to the chassis 3 parallel to the platen 2, and a slit plate 5 is attached to the back surface of the bar 4. A carrier 6 is attracted to the slit plate 5 by magnetic force, and a carriage (a mechanical part for printing characters, symbols, etc. on the print medium 1) 8 is fixed to the shaft 7 of the carrier 6. 8 linearly moves along the bar 4 with the carrier 6 on the slit plate 5 in parallel to the platen 2 and the print medium 1. Also, the slit plate 5
A plurality of step slits 10 are formed at equal intervals perpendicular to the direction of movement of the carriage 8, and the carrier 6 is provided with a winding armature 12 whose magnetic poles are equipped with windings. By inputting a pulse current through the carrier 6, for example, if n pulses are input, the tooth 1 required to move by n pitches of the slit 10 is
1, the carriage 8 is moved parallel to the platen 2 using a control means such that the teeth 11 of the armature 12 move along the bar 4 in accordance with the slit 1 (NC).

However, this printing device was open loop controlled. For this reason, there have been drawbacks such as inaccurate and low precision control of position and speed, inaccurate printing pitch, and vulnerability to disturbances such as external noise and voltage fluctuations.

Therefore, as an improvement to this example, the means shown in FIGS. 3 and 4 were used. In the figure, in addition to the slit plate 5 that is attached to the bar 4, there is a second slit having second slits 13 arranged with a certain regularity as shown in FIG. 4 at a smaller pitch than the slits 10 of the slit plate 5. A plate 14 is provided, and a sensing means such as a photosensor 15 attached to the carriage 8 through this slit 13 is moved to generate a footback signal and provide information to a control device for the position and speed of the carriage 8.

Such closed-loop control can solve the above-mentioned drawbacks.

However, with this method, the slit plate 5 and the second slit plate 14 must be installed in parallel, and as shown in FIG. The disadvantage is that it requires a great deal of time and effort to adjust, as it has to be installed in the correct position.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a printing device using a linear pulse motor that does not require adjustment of the slits and can be controlled in a closed loop.

Structure of the Invention The present invention is an improvement over the conventional example shown in FIG. 3, and is characterized in that the bar of the linear pulse motor is provided with a slit for controlling the amount of movement as well as a slit for stepping. Therefore, it is possible to provide a printing device using a linear pulse motor that does not require mutual positional adjustment of the slits and can perform closed-loop control at low cost.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIG. That is, the difference from the configuration shown in FIG. 3 is that the step slit 10 and the feedback control slit 13 are formed on the same slit plate 16 of the bar 4.

As mentioned above, the carrier 6 is attracted to the slit plate 16 attached to the bar 4 by the magnetic force of a magnet (not shown), and the slit plate 1 is attracted by the carrier 60-ra 9.
Can move on 6. The pitch of the slits 10 of the slit plate 16 corresponds to the pitch of the teeth 11 of the armature 120 of the carrier 6, and by applying a control means to the winding of the armature 12, the carrier 6 is moved under the control of the slits 10. The carriage 8 is fixed to the carrier 6 by a shaft 7 and moves together with the carrier 6. Photo sensor 1
5 is fixed to the carriage 8, and is attached so as to be able to sense the slit 13 of the slit plate 16. 7 Oto sensor 15 generates a feelback signal by sensing the slit 13, and the carrier 6
The position and speed of the robot can be controlled in a closed loop.

In this way, by making the slit plate attached to the bar wider than the bar width and protruding from it, and providing a slit for feedback control in the protruding part, high-precision closed-loop control can be easily achieved without the need for adjustment. It is possible to realize a printing device using a practical linear pulse motor.

Effects of the Invention As described above, according to the present invention, there is an effect that the feedback control slit does not need to be adjusted and can be easily installed at low cost.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of a printing device using a conventional linear pulse motor, Figure 2 is a perspective view of the linear pulse motor and carriage in Figure 1 seen from below, and Figure 3 is a perspective view of another conventional example. Figure 4 is an explanatory diagram showing the mutual relationship between the slit (6) and Figure 5 is part 1 of this invention.
! FIG. 2 is a perspective view of a part of an FC printing device using an example linear pulse motor. DESCRIPTION OF SYMBOLS 1... Print medium, 2... Platen, 3... Chassis, 4... Bar, 6... Carrier, 8... Carriage, 10... Step slit, 13... Feedback Control slit, 15...photo sensor,
16...Slit plate Figure 1 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A carriage that prints characters, symbols, etc. on a print medium, a linear pulse motor that transports this carriage, and a bar with step slits of this linear pulse motor for feedback control provided at narrower intervals than the slits. A printing device comprising a slit and a detection means provided on a movable side of the linear pulse motor to detect the detection slit and detect a position control signal.