JP2591813B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention scans a recording medium with a recording head in the width direction of the recording medium to form images, characters, and the like according to required recording information. And a recording device such as a printer.

(Prior Art) As a recording apparatus of this type, for example, a motor for moving a recording head, a pair of guide shafts arranged in parallel with a width direction of a recording medium, and a slidable slide shaft. Supported, a carriage for moving the recording head along its width direction while the recording head is opposed to the recording medium, and for sliding the carriage with respect to the guide shaft, There is known a device including a belt for transmitting a driving force generated by the motor to the carriage.

(Problems to be Solved by the Invention) However, since the carriage slides with respect to the guide shaft, it is, of course, necessary to secure a certain degree of squeeze tolerance in the fitting portion between the two. The following inconvenience occurs due to the play due to the tolerance.

That is, the difference between the power point of the inertial motion in the carriage for reciprocating the recording head and the operating point of the motor driving force applied to the carriage via the belt,
The carriage is not parallel to the guide shaft, but slightly tilts. Due to this inclination, when the carriage moves, a stick-slip phenomenon repeatedly occurs between the sliding surface of the fitting hole on the carriage side and the guide shaft.

The stick-slip phenomenon causes the carriage to move at the maximum moving speed (when moving at low speed) during printing.
Of the ink ejected from the print head
Variations occur in landing on the paper surface, and as a result, printing accuracy is reduced.

Therefore, if the tolerance is set strictly, the play becomes small, but the difference in thermal expansion and thermal contraction of parts due to temperature change,
The locked state may be transmitted between the carriage and the guide shaft.

For this reason, some recording devices have been proposed as described below, which ensure the necessary tolerance and can prevent rattling between the carriage and the guide shaft.

(First Example of Related Technology) That is, as shown in FIGS. 3 to 5, here,
A motor (stepping motor) 7 for moving the recording head 1, a pair of guide shafts 4, 5 arranged in the width direction of the recording paper 3 as a recording medium,
A carriage 2 slidably supported by these guide shafts, and for moving the recording head 1 along its width direction while opposing the recording head to the recording paper 3, a guide shaft 4,
The carriage 2 is provided with an endless belt 6 for transmitting a driving force generated by a motor 7 to the carriage 2 in order to slide the carriage 2 relative to the carriage 5.

The carriage 2 is made of a magnetic material, and the endless belt 6 is wound around pulleys 8 and 9 disposed at both ends of the moving range of the carriage. Output shaft is connected. In order to slide the carriage 2 along the guide shafts 4 and 5,
The carriage 2 has a hole 21 having a circular cross section corresponding to the guide shaft 5 close to the recording paper 3, and an elongated hole 22 corresponding to the guide shaft 4.

The bearing 12 is mounted in the hole 21 and the bearing
Necessary tolerances are set between the inner diameter of 12 and the outer diameter of the guide shaft 5 and between the elongated hole 22 and the guide shaft 4, respectively.

In particular, in this case, as shown in FIG.
a, facing one of the magnetic poles and facing them, and exerting an attractive force on the guide shaft 5, or, as shown in FIG. An electromagnet 11b faces one side of the electromagnet 11b so as to face the other, and exerts an attractive force on the guide shaft 5.

For this reason, the carriage 2 always receives the attractive force of the permanent magnet 11a or the electromagnet 11b, and vibrates under the influence of the motor 7, particularly at the time of high-speed driving (low-speed driving). And the recording head can be moved stably.

(Second Example of Related Technology) As shown in FIGS. 6 and 7, the chassis 10
A permanent magnet 17 having a predetermined length longer than the moving distance of the carriage 2 in the width direction of the recording paper 3 is disposed in parallel with the guide shafts 4 and 5 and faces the permanent magnet 17. As in the first example, a structure in which a magnetic plate 16 is provided on the side of the carriage 2 and an attraction force is applied between the two to prevent vibration and rattling of the carriage may be employed in the recording apparatus. it can.

(Third Example of Related Technology) As shown in FIGS.
A permanent magnet 17 having a predetermined length longer than the moving distance of the carriage 2 in the width direction of the recording paper 3 is disposed in parallel with the guide shafts 4 and 5 and faces the permanent magnet 17. The recording apparatus employs a structure in which a permanent magnet 18 is provided on the carriage 2 side and an attractive force or a repulsive force acts between the two to prevent the carriage from vibrating and rattling as in the first example. be able to.

However, in these cases, the attracting force or repulsive force of the magnet always acts on the carriage in a direction perpendicular to the moving direction of the carriage, so that the sliding resistance during the movement of the carriage is large and the load on the motor is reduced. Becomes

The present invention has been made on the basis of the above circumstances, and its purpose is to support a carriage slidably on a guide shaft in a state where a necessary hameai tolerance is secured, and to perform a reciprocating operation of the carriage during the reciprocating operation of the carriage. It is an object of the present invention to provide a recording apparatus having a magnetic structure designed to prevent generated vibration and rattling and to avoid useless sliding resistance due to magnetic force.

(Means for Solving the Problems) In order to achieve this object, according to the present invention, a motor, a guide shaft arranged in parallel to a width direction of a recording medium, and slidably supported by the guide shaft, A carriage for moving the print head along its width direction while facing the print medium to the print medium, and a motor generated by the motor for sliding the carriage relative to the guide shaft. A belt for transmitting a driving force to the carriage, and a predetermined length parallel to the guide shaft and provided along a movement area of the carriage, and longer than a movement distance of the carriage in a width direction of the recording medium. A first magnet having a height, in the vicinity of the first magnet, in the longitudinal direction thereof,
A second portion provided along a moving area of the carriage, having a predetermined length longer than a moving distance of the carriage in a width direction of the recording medium, and having a different polarity from the first magnet; It is characterized by having a magnet and a hollow conductor provided in the carriage and having a hollow portion penetrating only the first magnet.

(Operation) Therefore, the carriage can be slidably supported on the guide shaft while securing the necessary Saddle-eye tolerance. In addition, due to the Saddle-eye tolerance, vibrations and rattling that occur during the reciprocating operation of the carriage may occur. On the other hand, magnetic induction generates a force in the direction opposite to the moving speed proportional to the moving speed of the carriage, and can exert the function of a magnetic damper. And the load resistance on the motor can be reduced.

(Embodiment) Hereinafter, the configuration of the recording apparatus of the present invention will be described with reference to FIGS.
This will be specifically described with reference to the drawings. Note that the same components shown in the above-described cases are denoted by the same reference numerals, and detailed description thereof will be omitted. Here, a predetermined length 2 is provided on the chassis 10 in parallel with the guide shafts 4 and 5 and longer than the moving distance of the carriage 2 in the width direction of the recording paper 3.
The permanent magnets 14 and 15 of the book are arranged at a predetermined interval.

In this case, the surfaces of the permanent magnets 14 and 15 that open each other are S
It has poles and north poles, and the lines of magnetic force act across them. Further, one permanent magnet, in this embodiment, the portion of the chassis 10 corresponding to the permanent magnet 14 is
Notched, the permanent magnet 14 is fixed to the chassis 10 at both ends. Further, a hollow conductor (electric conductor) 13 in the form of a square frame is mounted on the carriage 2 so as to surround the permanent magnet 14 at a required interval.

With such a configuration, when the carriage 2 is moved along the guide shafts 4 and 5 via the endless belt 6 by the driving of the motor 7, the hollow conductor 13 is moved from the longitudinal direction of the permanent magnet 14, for example. As shown in FIG. 4, the speed v from left to right
Move with. At this time, according to Fleming's right rule,
A current i is induced in the direction shown in FIG. 2, and a force F (magnetic damper force) proportional to the velocity v and in the opposite direction is generated by the current i and the magnetic field generated by the permanent magnets 14 and 15. I do.

Since the force F in the direction opposite to the moving speed proportional to the moving speed of the carriage is generated in the hollow conductor 13,
The drive force acts on the carriage at substantially the same height as the applied force point 61 of the motor drive force via the endless belt 6 in the direction opposite to the drive force of the motor. As a result, the parallelism between the carriage 2 and the guide shafts 4 and 5 during the movement of the carriage 2 can be improved, and the inclination of the carriage 2 can be reduced. The frequency of occurrence of the stick-slip phenomenon occurring between the shafts 4 and 5 can be reduced.

Accordingly, in the constant speed region at the center of the moving area of the carriage 2, the magnetic damper effect by the force F can be exerted to prevent vibration, and when the motor is decelerated and stopped near both ends of the moving area of the carriage 2. In addition, since the force F decreases as the speed of the carriage 2 decreases, the load on the motor can be reduced when the carriage 2 is turned over where printing is not performed.

(Effects of the Invention) The present invention has been described in detail above, and includes a motor, a guide shaft arranged in parallel to a width direction of a recording medium, and a slidably supported by the guide shaft. A carriage for moving the recording head along its width direction while facing the recording head, and a driving force generated by the motor for sliding the carriage with respect to the guide shaft. And a belt for transmitting the carriage to the carriage, and a predetermined length provided in parallel with the guide shaft along the movement area of the carriage, and longer than a movement distance of the carriage in a width direction of the recording medium. A first magnet having, in the vicinity of the first magnet, in the length direction thereof,
A second portion provided along a moving area of the carriage, having a predetermined length longer than a moving distance of the carriage in a width direction of the recording medium, and having a different polarity from the first magnet; It is characterized by having a magnet and a hollow conductor provided in the carriage and having a hollow portion penetrating only the first magnet.

Therefore, the carriage can be slidably supported on the guide shaft while maintaining the necessary tolerance of the eye contact, and the function of the magnetic damper is provided for the vibration and rattling occurring during the reciprocating operation of the carriage. Can be demonstrated, and
The magnetic damper can be reduced in a portion not related to printing, that is, in the vicinity of the reversal portion of the motor, the motor load can be reduced, and the carriage can be smoothly moved.

[Brief description of the drawings]

1 and 2 show one embodiment of the present invention.
1 is a perspective view showing the entire apparatus, and FIG. 2 is a partially cutaway view showing a main part. FIGS. 3 to 10 disclose techniques related to the present invention.
The figures are perspective views of the entire apparatus showing a first example of the related art, FIGS. 4 and 5 are partially cutaway views showing the main parts of each specific example of the example, and FIG. FIG. 7 is a partially cutaway view showing a main part of the example, and FIG. 8 is a perspective view of the entire apparatus showing a third example of the related art. , FIG. 9 and FIG. 10 are partially broken cross-sectional views showing the main parts of each specific example of the case. 1 ... print head, 2 ... carriage, 3 ... print paper,
4, 5 ... guide shaft, 6 ... endless belt, 7 ... motor,
10… Chassis, 11a, 14, 15, 17, 18 …… Permanent magnet, 1
1b: electromagnet, 16: magnetic plate

Claims (1)

(57) [Claims] 1. A motor, a guide shaft disposed parallel to a width direction of a recording medium, and slidably supported by the guide shaft, wherein the recording head faces the recording medium while facing the recording medium. A carriage for moving the carriage along the width direction thereof, and a belt for transmitting a driving force generated by the motor to the carriage to slide the carriage with respect to the guide shaft. A first magnet provided parallel to the guide axis and along a movement area of the carriage, and having a predetermined length longer than a movement distance of the carriage in a width direction of the recording medium; In the vicinity thereof, along the movement area of the carriage, in the length direction thereof, having a predetermined length longer than the movement distance of the carriage in the width direction of the recording medium, and With the magnet A second magnet which is different polarities provided on the carriage, the recording apparatus characterized by having a hollow conductor having a hollow portion which is penetrated through only the first magnet.