JPS60983A - Serial printer - Google Patents

Abstract

PURPOSE:To miniaturize a printer, to simplify the assembling thereof and to enhance positioning accuracy, by mounting a flat motor to the rear surface of a printing head while bringing the pinion attached to the shaft of said motor into engagement with a rack constructed in a scanning direction. CONSTITUTION:A flat DC brushless motor 8 is mounted to the rear surface of a printing head 1 mounted on the carriage 3 of a serial printer and a pinion 10 is attached to the rotary shaft protruded from said motor 8 to be brought into engagement with a rack 11 constructed in a scanning direction. The brushless motor 8 is equipped with a rotor shaft 9 for constituting a rotor, the pinion 10, a timing slit disc 12, a rotor yoke 24, a rotor magnet 25, a bearing 26 for constituting a stator, a flexible substrate 27, a stator yoke 28 and a plurality of coils 29.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a serial printer that prints while a print head mounted on a carriage is conveyed horizontally by the carriage.

[Prior art]

When a print head is conveyed horizontally in a conventional serial printer of this kind, a carriage carrying the print head is connected to a part of a toothed belt or wire loaf, and this toothed belt or wire rope is conveyed by a motor. Alternatively, methods such as meshing the carriage with a male threaded shaft and rotating this male threaded shaft with a motor are adopted, but in the case of Izun, the carriage is also transferred from a conveyance drive source such as a motor via a power transmission means. Transport is carried out by indirectly transmitting power.

However, in such conventional serial printers, a power transmission means is interposed between the carriage and the conveyance drive source, so power loss occurs during power transmission or deformation of the power transmission means, such as a toothed belt or wire rope. This poses problems such as variations in conveyance positioning accuracy due to elongation of This also has the disadvantage of increasing the size of the printer.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and the present invention eliminates the power transmission means used in the prior art by moving the carriage carrying the print head directly by a motor. The purpose of this invention is to realize the conveyance of the print head with no power loss and high positioning accuracy, and to simplify and facilitate the assembly of the groove 9 of the printer, thereby making it possible to downsize the printer.

[Purchase of invention]

In order to achieve the above-mentioned object, the present invention is equipped with a carriage-mounted KaJ-shaped head that can run horizontally along a platen, and a flat DC brushless motor is fixed to the rear surface of the print head. protruding a rotor shaft on the side opposite to the print head, attaching a rotation transmission member to the rotor shaft, and disposing a linear drive member that engages with the rotation transmission member in parallel to the traveling direction of the carriage,
By rotating the rotor shaft of the flat DC brushless smoke, the carriage is made to move by itself via a rotary transmission member and a linear drive member, and a flexible substrate incorporated in the flat DC brushless smoke is provided with a print head. A pattern 7 is formed, and a coil for driving a print wire provided in the print head is connected to the pattern.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view of essential parts showing a first embodiment of a serial printer according to the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a side view of the same. The head 1 is mounted and fixed on a carriage 3 by two clamp screws 2, and its tip faces a platen 4 at a predetermined distance. 05 is a printing paper set on the platen 4.

Reference numeral 6 denotes a guide rail arranged parallel to the platen 4, the front and rear ends of which are folded upward, and a gear part 1 is formed along the longitudinal direction at the folded part on the front side. . The carriage 3 is removed so as to sandwich both folded portions from above and below, so that the carriage 3 can run parallel to the platen 4 along the guide rail 6.

8 is a flat DC brushless motor (hereinafter referred to as a brushless motor) mounted on the rear surface of the printing hand 1;
One end of the rotor shaft 9 projects horizontally on the side opposite to the print head 1, and a pinion 10 as a rotation transmission member is mounted on one end of the rotor shaft 9.

Reference numeral 11 denotes a rack as a linear drive member, which is installed parallel to the guide rail 6 in the traveling direction of the carriage 3, and teeth formed on the horizontal surface of this rack 11 mesh with the pinion 10. are doing.

Reference numeral 12 denotes a timing slit disk fixed to the rotor shaft 9, and a large number of slits 13 of the same size are formed on the periphery of the disk.
are provided at regular intervals, and a detection unit 14 consisting of a light emitting element and a light receiving element facing each other with the slit 13 in between is provided on the carriage 3.

Reference numeral 15 denotes an endless ink ribbon with a continuous length, which passes through the front end of the print head 1 and surrounds the print head 1 and the brushless morph 8 integrated therewith. The ink replenishment cartridge 16 is guided by the guide post of the carriage 3, and is set so as to pass through an ink replenishment cartridge 16 mounted on the carriage 3.

Inside this ink replenishment car 1-IJ body 16, there is a rotatable ink replenishment roller 11 impregnated with ink to replenish the ink ribbon 15, and a rotatable ink replenishment roller 11 that presses the ink ribbon 15 against the ink replenishment roller 17 and controls its conveyance. A feed roller supported on a rotating shaft 18 is provided for this purpose.

Reference numeral 19 denotes a drive gear portion connected to the lower part of the rotating shaft 18. This drive gear portion 19 has a well-known one-way truss groove and is connected to the gear portion 7 of the guide rail 6.
When the carriage 3 travels horizontally on the guide rail 6, the rotating shaft 18 is rotated, and the ink ribbon 15 is rotated.
It is now possible to send

That is, if the carriage 3 travels to the right in FIG. The ink ribbon 15 is fed in a predetermined direction by the attached feed roller. On the other hand, when the carriage 3 travels to the left, the drive gear section 19 rotates in the "time" direction, but this rotation is not transmitted to the rotating shaft 18 due to the movement of the one-way mechanism.
Therefore, the ink ribbon 15 is not fed.

Additionally, a planetary gear mechanism is generally well known as a means for transmitting rotation to the drive gear section 19. In this case, the drive gear section 19 is
will always rotate in the same direction.

FIG. 4 is an enlarged side sectional view of the print head 1 and brushless motor 8 in FIGS. 1 to 3, and FIG. 5 is an enlarged exploded perspective view of the brushless motor 8.

The print head 1 is a generally well-known electromagnetically driven wire dot head, and includes a yoke 20, a plurality of cores 21 arranged in a circular shape on the yoke 20, and a plurality of cores 21 arranged around the outer periphery of each core 21. It includes an attached coil 22, a plurality of printing wires 23, and the like. Incidentally, since the detailed structure and operation of this print head are not particularly important in the present invention, their explanation will be omitted.

On the other hand, the brushless motor 8 includes the rotor shaft 9, the pinion 10, and the timing slit disk 12 that constitute the rotor.
, a rotor yoke 24, a rotor magnet 25, a bearing 26 constituting the stator (I), and a flexible substrate 21.
, a stator yoke 28, and a plurality of coils 29. Here, the timing slit disk 12 and the disk-shaped rotor yoke 24 each have a hole in the center, and each of the timing slit disks 12 and the disk-shaped rotor yoke 24 has a hole in the center. A rotor shaft 9 is inserted into the hole, and a flange portion 30 formed on the rotor shaft 9 is inserted.
The timing slit disk 12 and the rotor yoke 24 are collinearly fixed with screws etc. Also, the rotor magnet 25 is formed in an annular shape as shown in FIG. The rotor magnet 25 has a structure in which north poles and south poles (four each in this embodiment) are magnetized alternately, and this rotor magnet 25 is fixed on the circumference of the rotor yoke 24 centered on the rotor shaft 9. has been done.

The flexible substrate 27 is fixed to the rear surface of the yoke 20 forming the rear surface of the print head 1, and on the flexible substrate 2T there is a bearing 26 that rotatably supports the rotor shaft 9, and a bearing 26 that is centered so as to avoid this bearing 26. A stator yoke 28 having a hole is fixed to the stator yoke 28, and a plurality of (six in this embodiment) stator coils 29 are mounted on the stator yoke 28, each with a small gap between the rotor magnet 25 and the rotor magnet 25, for example ()5. They are fixed so that they are facing each other with a gap that is about the size of a battle.

FIG. 6 is an enlarged view of the flexible substrate 27 viewed from the side of the brushless motor 8, 31, 32. and 33 are patterns, 34, 35 . and 36 are respective patterns 31 to 33
One end of the stator coil 29 is connected to the connection part 34 by soldering, and the other end of the stator coil 29 is connected to the connection part 35 by soldering. Well connected. Electric power is supplied to each stator coil 29 at three locations in the connection portion 35.

Further, signal lead wires of the light emitting element and the light receiving element of the detector 14 are connected to the connection part 36.

FIG. 7 is an enlarged view of the flexible substrate 27 seen from the print head 1 side, where 3γ and 38 are patterns, 39 is a connecting portion provided in pattern 37, and 40 is a connecting portion provided in pattern 38. One end of each coil 22 is connected by soldering as a common power supply part 39.
L, and the other end of each coil 22 is individually connected to a connecting portion 40 by soldering.

As described above, in this embodiment, both sides of the flexible substrate 2γ are formed with patterns (jf), and can be shared by the print head 1 and the brushless motor 8 (1η structure).
One end of this flexible/pull board 21 is extended as a flexible cord 41 as shown in FIG.
In this embodiment, power is supplied to the print head 1 and the brushless motor 8 via the flexible cord 41, and signals are exchanged between a control circuit (not shown) and the print head 1 and the brushless motor 8. is now being carried out.

It should be noted that each of the members constituting the brushless motor 8 described above is formed thin, so that the brushless motor 8 as a whole is constructed flat. To explain the operation, first, the rotation control of the brushless motor 8 is performed in the same manner as a known DC brushless motor. That is, the arrangement of the magnetic poles of the rotor magnet 25 and the arrangement of the stator coils 29 have a predetermined relationship, and by sequentially switching the stator coils 29 to be energized according to the rotational position and direction of the rotor, the electromagnetic action between the rotor and the stator is reduced. The rotor can be rotated.

When the rotor is rotated, the carriage 3 is engaged with a shaft 11 parallel to the rotor shaft 9, so that the carriage 3 moves horizontally along the guide rail 6 and parallel to the platen 4.

When the carriage 3 moves rightward in FIG. 1, the ink ribbon 15 is fed and the print head 1 mounted on the carriage 3 prints on the print paper 5.

It should be noted that switching the travel of the carriage 3 to the right or left direction is performed by a liminter switch or the like provided at both ends of the travel path of the carriage 30, although not shown here.

Further, the slit 13 of the timing slit disk 12, which rotates together with the rotor shaft 9, is detected by the detector 14 while the carriage 30 is traveling, and thereby the rotational position of the rotor can be detected.

Next, a second embodiment of the present invention will be described by illustrating only the print hand 1 and brushless motor 8.

This second embodiment has a print head 1 as shown in FIG.
The yoke 20 of the brushless motor 8 is also used as the stator yoke of the brushless motor 8, and compared to the first embodiment described above, the thickness of the yoke 20 is reduced by ignoring mutual magnetic interference between the print head 1 and the brushless motor 8. The stator yoke 28 shown in FIGS. 4 and 5 is omitted.

1. In the first embodiment, the pattern was formed on both sides of the flexible substrate 21, but it is also possible to form it on only one side as shown in FIG. 9. Here, the pattern 42 is the coil of the print head 1. Connected with 22, also pattern 4
3 is connected to the brushless motor 8.

Also in the second embodiment configured in this way, the carriage 3 can be made to move on its own as in the first embodiment.

〔Effect of the invention〕

As explained above, in the present invention, as a transport drive source for the print head mounted on a carriage, a flat direct current plastic cylinder smoke is integrally attached to the rear surface of the print head, and a rotation transmission is transmitted to the rotor shaft of the flat DC plastic cylinder smoke. The structure is such that the carriage is self-propelled by attaching the member and arranging the linear drive member that engages with the rotational transmission member parallel to the travel path of the carriage and rotating the rotor shaft of the brushless motor. , the length from the center of the platen to the front can be shortened, making vapor handling easier and making the printer thinner and more compact.In addition, the brushless motor can be installed integrally with the print head. Therefore, the power of this brushless motor can be directly transmitted to the carriage to convey the print head, and the elasticity of toothed belts, wire lobes, etc., which are indirect power transmission means used in conventional devices, can be directly transmitted to the carriage. Since the members are removed, power loss is reduced and the positioning accuracy of print head conveyance can be improved.

In addition, by integrating the print head and brushless motor, only one flexible board is required to connect circuit components such as each coil and stator coil, and the connections can be easily replaced. Since the connector connection and wiring processing during carriage assembly can be eliminated and the assembly work can be concentrated on a board-by-board basis, costs can be reduced.

Furthermore, the brushless motor can be mounted flat, thin, and lightweight, and the only thing that connects the printer body and guide rails, the print head on the carriage, and the brushless motor is a flexible cord extending from the flexible board. Therefore, the carriage and the like can be easily assembled and mounted in the printer without any adjustment, and it is possible to save labor in assembly work and improve assembly efficiency.

Furthermore, as mentioned above, since the carriage is self-propelled, it is possible to incorporate 21 or more carriages into one printer and have each carriage independently transport the print head. The present invention can be easily applied to a multicolor printer that prints in multiple colors by increasing the printing speed or installing ink ribbons of different colors together with ink supply cartridges.

[Brief explanation of the drawing]

FIG. 1 is a side view of the serial printer according to the present invention, FIG. 4 is an enlarged side sectional view of the print head and flat DC brushless motor in the first embodiment, and FIG. 5 is also a flat DC brushless motor. Enlarged exploded perspective view of brushless motor, No. 6
The figure is an enlarged view of the flexible substrate as seen from the print head side, FIG. 7 is an enlarged view of the flexible substrate as seen from the flat DC brushless motor side, and FIG. 8 is the print head and flat head in the second embodiment. FIG. 9 is an enlarged side sectional view of the type DC brushless motor, and is also an enlarged view of the flexible substrate. 1... Print head 3... Carriage 4... Platen 6... Guide rail 8... Flat DC brushless motor 9... Rotor shaft 10... Pinion 11... Rank 20...・York 22...
Coil 24... Rotor yoke 25... Rotor mount 21... Flexible board 28... Stake yoke 29... Stator coil 41... Flexible cord patent applicant Oki Electric Industry Co., Ltd. Kaku 1-Ryu 2 - 3- Plow 4r2

Claims (1)

[Claims] 1. A flat DC brushless smoke is attached to the rear surface of the print head mounted on a carriage that can run horizontally along the platen, and one end of the rotor shaft is made to protrude horizontally to the opposite side of the print head. A rotary transmission member is attached to one end of the rotor shaft, and a linear drive member that engages with the rotary transmission member is arranged parallel to the traveling direction of the carriage to rotate the rotor shaft of the flat DC Brasoles smoke. Serial printer 0 characterized in that the carriage is self-propelled via a transmission member and a linear drive member.