JPS62212180A - Printer - Google Patents

Abstract

PURPOSE:To maintain a gap at a printing head with high accuracy and automatically set an optimum gap according to the total thickness of a printing paper, by providing a pulse motor for rotating one of guide shafts, a paper bail operated in conjunction with the motor, and a paper-pressing plate. CONSTITUTION:A gear 11 is fixed to the end part of an eccentric shaft part 2a of a guide shaft 2, and is engaged with a small gear 12 fitted to a rotary shaft of a pulse motor 13. By driving the motor 13, with a position for zero gap as a reference position, an optimum gap of 0.3-0.4mm can be secured. When the gear 12 is rotated clockwise by the motor 13, the gap between a platen 6 and the tip of a printing head 4 is reduced, and simultaneously, a paper bail mechanism is operated through a bail arm 17 and a paper bail 14 by a torsion spring 18 under the functions of an eccentric stud 20a of a gear 20 and a crank 19. A paper-pressing plate 22 operated by a spring or the like with a pivot shaft 22b as a center prevents a printing paper 8 from being levitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot impact type dot printer, and particularly to a printer equipped with an interlocking mechanism of a gap adjustment device between a print head tip and a platen, a paper veil, and a paper holding device.

[Conventional technology]

As a conventional dot printer, there is one shown in FIG. 3, for example. FIG. 3 shows a perspective view of the printing mechanism section of the printer. In Figure 3, both side frames of the printer (
Not shown. ) A fixed guide shaft 101 extends to connect the two side frames, and a guide shaft 102 rotatably held by both side frames allows the carrier 103 to move parallel to the platen 106 and reciprocate between both side frames. It has become. Furthermore, gear rear 103
has a print head 104. A ribbon cassette 107 is mounted on the carrier 103, and this carrier 103 carries a print paper 108 with the tip of the print head 104 wound around a platen 106.
The ink ribbons 109 and 109 are arranged opposite each other so as to be close to each other via the ink ribbon 109, and perform reciprocating motion.

At this time, printing is performed by operating the printing wire at the tip of the printing head 104 at high speed in response to a printing command.

In this operation, the total stroke of the printing wire is usually 0.
．． 5 to 0.611111 and to obtain the optimum print quality, it is preferable to set the gap between the tip of the print head 104 and the print paper 108 so that the dot is printed at a stroke position in the range of 0.3 to 0.4. .

Furthermore, it may be necessary to copy a plurality of sheets of printing paper 108, and in this case, it is necessary to adjust the gap at the tip of the printing head 104 according to the total thickness of printing paper 108. For this reason, a gap adjustment device shown in FIG. 4 is generally employed. That is, the carrier 10 is manually rotated by rotating the rotatable guide shaft 102 having an eccentricity of Δe by a specified angle.
3 in the direction of the arrow around the fixed guide shaft 101 to vary the gap Δg+ between the tip of the print head 104 and the platen 106 and maintain it at the tenant mechanism setting position to ensure appropriate print quality. The paper pail 114H for holding the paper sheet is pressed.This operation is performed by a toggle mechanism or the like in which the pail arm 116 at both ends is biased by a tone 1 spring 118 to the center of the stud 117. Open and close manually.

[Problems to be solved] In the conventional printers mentioned above, the gap adjustment device is operated manually, which can lead to forgetting to operate it and setting errors. There is no guarantee that it will last. Rainbow paper veil 11
Similarly, since the mechanism No. 4 is manually operated, it is easy to forget to operate it, and the structure is such that it is easy to make mistakes in handling operations. Father, printing paper 108 ri Some lifting occurs in the printing area, which has the drawback of ensuring optimal print quality and making printing noise a problem.

[Means for solving problems]

The present invention maintains the gap between the platen and the tip of the print head with high precision, and can automatically set the optimal gap according to the total thickness of the printing paper, thereby eliminating the possibility of erroneous operation and eliminating the lifting of the printing paper. It is an object of the present invention to provide a printer that can prevent such problems.

To this end, the present invention provides a dot impact printer with a carrier that moves parallel to the platen using two guide shafts extending to connect the left and right side frames, and a pulse motor that rotates one of the guide shafts. The present invention provides a printer characterized in that it has a paper bail and a paper holding plate that are interlocked with the above-mentioned pulse motor.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a printing mechanism of a printer showing one embodiment of the present invention. In Figure 1, guide shaft 2
The eccentric shaft portion 2a is rotatably supported by the side frame 10, a gear 11 is fixed to the end of the eccentric shaft portion 2a, and meshes with a small gear 12 attached to the rotating shaft of the pulse motor 130.

Based on the above configuration, the principle of operation of the present invention will be explained with reference to FIG. When the pulse motor 13 rotates the gear 11 clockwise (as viewed from the pulse motor 13 side) via the small gear 12, the gap between the tip of the platen 6 and the print head 4 narrows, and the N of the pulse motor 13 With the pulse, the gap becomes O and is driven by M pulses. (Since the gap is 0 between the N pulse and the M pulse, the pulse motor 13 will perform a step-out operation e) If the pulse motor 13 is driven by the P pulse in the opposite direction as described above, using the position of this gap O as the reference position. Optimal gap 0.3-0.4
fl can be secured. Next, the interlocking mechanism of the gap adjustment device and the paper pail 14 will be explained. The small gear 12 attached to the shaft of the pulse motor 13 meshes with the gear 11 fixed to the eccentric shaft portion of the kite shaft 2 and further with the gear 20, and the eccentric stud 20 of the gear 20 meshes with the gear 11 fixed to the eccentric shaft portion of the kite shaft 2.
It has a crank 19 at one end and is connected to a pail arm 16 at the other end. Furthermore, on the back side of the gear 20, an eccentric stud 20
A has a crank 21 connected to the upper end 22a of the paper press plate 22.

The interlocking operation will be explained with reference to FIG. When the gears 11 and 12 are rotated by the pulse motor 13 via the small capacitor 12 in a clockwise direction (as viewed from the pulse motor 13 side), the gap between the tip of the platen 6 and the print head 4 is narrowed. At the time of opening, the bail arm 16 is operated around the stud 17 by the eccentric stud 20a of the gear 20 via the crank 19' (the bail arm 16 is opened → closed). Within N pulses of the pulse motor, the pail arm 17. A paper holding mechanism operates via the paper pail 14. Here, the elongated hole portion of the crank 19 is for obtaining a phase difference between the vertical phase of the pulse motor 13 and the bail arm operation. On the other hand, the other end of the crank 21 connected to the eccentric stud 20a is connected to the upper end 22a of the vapor holding plate 22, and a pivot shaft 22b is rotatably supported under the paper holding plate 22. Although not shown, the paper holding plate 22 is attached to the pivot shaft 22b by a spring or the like.
It is configured to prevent the printing paper 8 from lifting up, mainly at the .

Therefore, it is not necessary to explain that the paper press plate 22 described above also operates in conjunction with the paper pail 16. In the above explanation, the paper pail (6) and the vapor presser plate are moved from open to closed, but there is no need to explain that the movement from close to open is similarly linked.

〔Effect of the invention〕

As explained above, the present invention provides a dot impact printer in which a carrier is moved parallel to a platen by two guide shafts extending to connect left and right side frames, and one of the guide shafts is rotated. Since the printer is characterized by having a pulse motor, and a paper pail and paper holding plate that are interlocked by the pulse motor, by driving the pulse motor, the gap between the platen and the tip of the print head can be maintained with high precision, and the printing can be performed easily. The optimum gap can be automatically set according to the total thickness of the paper, ensuring high printing quality, and the paper pail mechanism prevents erroneous operation, and the paper press plate prevents the printing paper from floating up.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a printing mechanism section of a printer showing an embodiment of the present invention, FIG. 2 is a pulse motor and gap characteristic diagram showing an embodiment of the present invention, and FIG. 3 is a conventional dot printer. FIG. 4 is a perspective view of the printing mechanism section of the conventional dot printer, and FIG. 4 is a sectional view of the printing mechanism section of the conventional dot printer. 1.2... Kite shaft 3... Carrier 6
...Platen 8 ...Print paper 10...
・Side frame 13...Pulse motor 14...
・Paper pail 22...paper holding plate

Claims (1)

[Claims] In a dot impact printer, the carrier moves parallel to the platen using two guide shafts extending to connect the left and right side frames.
A printer comprising: a pulse motor that rotates one side of the guide shaft; and a paper pail and a paper press plate that are interlocked by the pulse motor.