JPS625341Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spacing mechanism system for driving a printing mechanism section of a printer device. Computers have become widespread, especially in the field of office processing, and the field of application of printer output has also expanded, providing low-cost, high-precision, high-speed, There is a growing demand for small and lightweight printer devices.

In recent years, dot printers and inkjet printers have begun to be widely used as printer devices of this type. These printers are non-print type printer devices in which the printing mechanism section travels at a constant speed during the printing stroke by speed control, and prints during this constant speed travel. Also, the printing speed of this printer was determined by this constant running speed. In such a case, the motor is driven at its maximum output (maximum applied current) in the acceleration and deceleration parts, and in other parts, that is, in the constant speed part, it is driven only to cover the speed reduction due to printing operation and running friction of the slide system. Therefore, only a small amount of motor output was required compared to the acceleration/deceleration part.

The running system of the printing mechanism of conventional printers uses a rotating motor and a transmission mechanism such as a belt or wire to move on a slide, and the position and speed signals are attached coaxially to the rotating shaft of the rotating motor. It was detected from optaco or inductosin. Therefore, the higher the printing speed, the greater the acceleration and deceleration.
As a result, vibrations due to the expansion and contraction of the wire or belt occur in the transmission mechanism system, and even if the position detection section is controlled without any position error, the printing mechanism section will end up with a position error, making it difficult to print with good quality. I couldn't help it. Furthermore, conventional transmission mechanism systems are mechanically complex and lack reliability in terms of longevity and stability.

Furthermore, a method of using a linear motor to drive the printing mechanism in a type-type printer that eliminates the above-mentioned drawbacks has been published in Materials EMC-78-31 of the Mechanism Components Study Group of the Communications Society of Japan. However, since the above device is a type printer, it takes time to select type and the printing speed is slow, and the linear motor requires the printing mechanism to stop at any position during the motor stroke, or to accelerate or decelerate to an arbitrarily set speed. The magnetic circuit configuration was such that a uniform generated force, that is, a uniform force constant distribution, could be obtained over the entire motor stroke. Therefore, magnetic circuits have become considerably larger in size and weight.

As mentioned above, when printing, dot printers and inkjet printers have faster printing speeds than type printers because the printing mechanism always runs at a constant speed without stopping and prints during that time. When a linear motor is used in such a device, the required driving force for the constant-speed traveling portion is extremely small compared to the acceleration/deceleration traveling portion, and the magnetic circuit configuration does not need to be exactly the same for all strokes.
Furthermore, when comparing the constant speed traveling portion and the acceleration/deceleration traveling portion in terms of length, the constant speed traveling portion occupies a much larger portion of the motor stroke. Therefore, if the linear motor used in the above-mentioned document is adopted in such a device, the majority of the motor stroke will have excessive performance for the device function, and additional permanent magnets and yokes will be added, resulting in a reduction in the magnetic circuit. New disadvantages have arisen: increased price and weight.

An object of the present invention is to provide a spacing mechanism for a printer device that prints while running at a constant speed, which eliminates the above-mentioned drawbacks and is inexpensive, high print quality, compact, lightweight, and high speed.

According to the present invention, in order to eliminate the positional error caused by the aforementioned transmission mechanism, a linear motor type that directly drives the printing mechanism is adopted, and in order to optimize the drive of the printing mechanism and the motor configuration, The motor is driven by reciprocating the printing mechanism at a constant speed between both ends of the printing stroke, and printing is performed while running at a constant speed.The motor configuration is such that the force constant of the motor is large at both ends of the printing stroke, This results in a type of printer spacing mechanism with a concave distribution that is smaller at .

Embodiments of the present invention will be described below with reference to the drawings.
Figure 1 is a plan view of one embodiment of a device using the spacing mechanism system of the present invention, and Figure 2 is taken along the line X-X in Figure 1.
The sectional view and FIG. 3 are plan views showing the configuration of the linear motor shown in FIG. 1. A platen 102 is attached to the frame 101, and a knob 10 rotates the platen 102 and the paper wound thereon.
It is equipped with 6. A paper supply motor 105 is fixed to the frame 101 to automatically supply paper, and is connected to the platen 102 via a gear train 107.
It is designed to drive. A printing mechanism section 108, a ribbon cartridge 109, a position detecting section block 110, and a movable coil 9 are mounted on the carriage 8. It is easy to understand that in the case of a type that does not require a ribbon cartridge, such as an inkjet printer, the printing mechanism section 108 and the cartridge 8 may be connected. The moving coil 9 receives a force within the air gap 7 of the linear motor magnetic circuit 10 due to the interaction between the current applied to the moving coil 9 and the magnetic flux within the air gap 7. As a result, said carriage 8 holds the moving coil 9.
is guided by slide guides 103 and 104 and moves within the motor stroke. position scale 1
Reference numeral 11 denotes a scale that records position signals over the motor stroke, and a position detector block 110 held in the carriage 8 is connected to the position scale 11.
1 is read to detect the current position of the carriage 8. The linear motor magnetic circuit 10 includes a center yoke 5 having a rectangular cross section slightly longer than the motor stroke, a side yoke 3 having a permanent magnet piece 1 magnetized in the thickness direction on one side, and a permanent magnet on one side like the side yoke 3. Two sets of side yokes 4 having a piece 2 shorter than half the length of the side yoke 3 and installed only at both ends of the motor stroke, and the permanent magnet piece 1 on both sides with the center yoke 5 in the middle. and 2 are configured by a bottom yoke 6 which fixes the side yokes 3 and 4 at both ends in the longitudinal direction so as to face the center yoke 5. A uniform magnetic flux density is generated in the gap 7 between the permanent magnet pieces 1 and 2 and the center yoke 5, and the movable coil 9 can move within the gap 7. Moreover, as can be understood from the figure, the main driving force applied to the coil 9 within this gap 7 is obtained by approximately 50% of the entire side of the coil.

Therefore, with such a magnetic circuit configuration, when a constant current is applied to the movable coil 9, the force received by the movable coil 9 is larger at both ends of the motor stroke, that is, at the portion where the side yoke 4 is located, than at other portions.
When this motor is driven in a printer device as shown in Fig. 1, at both ends of the motor stroke, the necessary speed is required to accelerate the carriage 8 to a certain set speed, or to decelerate and accelerate from a constant speed state to the set speed in the opposite direction. In other parts, the high output is sufficient to overcome external resistance and provide just the right amount of output to drive at a constant speed. In this way, the spacing mechanism has a one-to-one correspondence between the motor stroke and the printing stroke, and the distribution of the force generated by the motor can be arbitrarily set according to the required driving force distribution. Therefore, when this spacing mechanism is applied to a printer device that constantly repeats a fixed driving operation, an optimally designed spacing mechanism system in which the distribution of the force generated by the motor matches the required distribution of driving force can be obtained.

FIG. 4 is a plan view showing an example of a configuration in which the magnetic circuit configuration shown in FIG. 3 is partially modified to minimize price increase and increase speed. Expensive but high-performance rare earth magnets are used only for the permanent magnet pieces 21 at both ends of the motor stroke, and inexpensive ferrite magnets are used for the other permanent magnet pieces 22. Therefore, high output can be obtained at both ends of the motor stroke,
It becomes possible to set the running speed of the printing mechanism section to be high.

Fig. 5 shows an example of a case using a different type of linear motor proposed in the specification of Japanese Patent Application No. 140653/1983 (only the configuration of the linear motor part is shown), and Fig. This is an example in which a linear motor of the type proposed in the specification of No. 53-140654 is used (only the configuration of the linear motor section is shown), and in both cases, the moving coil is divided into a plurality of parts to facilitate drive control. However, it is clear that the same effect as that obtained in the first embodiment can be obtained.
Incidentally, in FIGS. 4, 5, and 6, the same parts in the magnetic circuit are indicated by the same reference numerals.

Furthermore, in the above embodiments, the thickness of the permanent magnet pieces in the magnetization direction is all the same, but it is also possible to give a distribution to the generated force within the motor stroke by changing the thickness in the magnetization direction. It is.

In this way, according to the present invention, by employing a linear motor in the spacing mechanism system, even when printing at high speed, unlike conventional spacing mechanism systems, the linear motor is used in the spacing mechanism system. By configuring the motor's magnetic circuit to avoid positional errors and to match the required driving force distribution, it is possible to remove yokes or permanent magnets that are unnecessary for the device's function, and to design a motor that is optimal for the device's function. , the weight and cost of the magnetic circuit section can be reduced.

As a result, the present invention has made it possible to reduce the weight, size, and simplification of the mechanical system of the device, making it possible to obtain a high-speed, low-cost printer device with good print quality.

Modifications can be made without departing from the spirit of the present invention, and the above description does not limit the scope of the present invention.

[Brief explanation of the drawing]

Figure 1 is a plan view of one embodiment of a device using the spacing mechanism of the present invention, and Figure 2 is taken along the line X-X in Figure 1.
3 is a plan view showing the configuration of the linear motor of the spacing mechanism shown in FIG. 1, and FIGS. 4, 5, and 6 are plan views showing other embodiments of the linear motor configuration. be. In the figure, 101 is a frame, 102 is a platen, 103 and 104 are slide guides, and 105
106 is a paper supply motor, 106 is a knob, 107 is a gear train, 108 is a printing mechanism section, 109 is a ribbon cartridge, 110 is a position detection section block, 111 is a position scale, 1, 2, 21, 22, 23, 24
1 is a permanent magnet piece, 3 and 4 are side yokes, 5 is a center yoke, 6 is a bottom yoke, 7 is an air gap, 8 is a carriage, 9 is a moving coil, and 10 is a magnetic circuit.

Claims (1)

[Scope of utility model registration request] In a printer device in which a printing mechanism section reciprocates at a constant speed between both ends of a printing stroke and prints while traveling at the constant speed, the magnetization direction is perpendicular to the motor stroke direction and the motor is moved only at both ends of the motor stroke. a first permanent magnet arranged to cover a part of the motor stroke; a second permanent magnet whose magnetization direction is orthogonal to the motor stroke direction and arranged to cover the entire motor stroke; The printing mechanism section is driven by a linear motor including a moving coil that runs in a gap formed by the first permanent magnet and the second permanent magnet facing each other at both ends. Printer device spacing mechanism.