JP2872093B2 - Printer printing mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing mechanism of a printer, and more particularly to a printing mechanism of a printer for printing on a bankbook having a seal seal.

[0002]

2. Description of the Related Art As shown in FIG. 4, a printing mechanism of a conventional printer is configured such that a medium 10 composed of a bankbook is sent on a platen 8 and a carrier 1 is guided by a shaft 12 to move in parallel with the platen 8. Print head 3 held by carrier 1
To print on the medium 10. A card holder 2 for guiding a medium 10 is fixed to a carrier 1, and a print head 3.
An ink ribbon 11 is caused to run between the medium and the medium 10.

When printing with the printing mechanism of this printer,
After detecting the thickness of the medium 10 with a sensor (not shown),
The gap between the platen 8 and the printer head 3 is adjusted to an appropriate value by moving the platen 8 up and down, and thereafter printing is performed with a fixed gap.

[0004]

The bankbook has a seal seal portion 9 made of a transparent tape or the like which is attached to a portion where the seal is stamped. FIG. 4 shows the medium 10 as a passbook in a state where another page is overlaid on the page provided with the seal seal section 9. Since the thickness of the seal portion 9 of the medium 10 becomes thicker than the thickness of other parts of the medium 10 detected by a sensor in advance, a problem occurs in the printing mechanism of the conventional printer.

That is, in the printing mechanism of the conventional printer, after detecting the thickness of the medium and adjusting the printing gap, printing is performed with a fixed printing gap. The gap narrows and the ink ribbon is sandwiched between the print head and the medium,
As a result, there has been a problem that printing thinness and dirt are generated due to poor ribbon running.

[0006]

Means for Solving the Problems Printing of the printer of the present invention
The mechanism consists of a platen to back the media and this platen
The carrier that moves parallel to the
The platen that is movable within a certain range
Lint head and the axis fixed to the carrier
It is swingably supported and the print
Swing arm that comes in contact with the stud provided on the pad
And in the direction parallel to the platen of this swing arm
At a position close to the print area by the print head.
The part near the platen on the outer periphery is
From the tip of the print head in a direction perpendicular to
Between the platen side and a medium of normal thickness.
With a detection roller at a position less than the
ing.

[0007] The printing mechanism of the printer according to the present invention includes a detection row.
Are provided on both sides of the print section of the print head.
A pair of swing arms are provided corresponding to a pair of detection rollers.
You can also make it go.

[0008]

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

FIG. 1 is a front view showing a state in which a normal thickness portion of a medium 10 according to an embodiment of the present invention is printed. 2 and 3 are front views showing the operating state of the seal seal portion 9 of the embodiment shown in FIG.

Reference numeral 1 denotes a carrier which is guided and moved by a shaft 12. Reference numeral 2 denotes a card holder fixed to the carrier. Reference numeral 3 denotes a print head which is attached to the carrier 1 and which can move up and down within a predetermined range with respect to the carrier 1. Is a spring for constantly pressing the print head 3 downward against the carrier 1, 5a
5b is a swing arm which is rotatably supported by the card holder 2, 6 is a stud which is fixed to the print head 3 and the swing arms 5a and 5b abut from below, and 7a and 7b are attached to the tips of the swing arms 5a and 5b. The detecting roller 8 is used as a backing of the medium (passbook) 10 at the time of printing, and a platen 11 which moves up and down to secure an appropriate printing gap, and 11 is an ink ribbon.

Next, the operation of this embodiment will be described. First, the platen 8 is located at the lower limit of the vertical movement range, and the print head 3 is also located at the lower limit of the vertical movement range. After detecting the thickness of the medium 10, the platen 8 moves upward and is fixed at a height to obtain an appropriate print gap. Medium 10
As shown in FIG. 1, in the normal printing in a portion where the seal seal portion 9 is not provided, the printing is performed while maintaining a constant gap between the print head 3 and the medium 10. At this time, the detection rollers 7a and 7b are configured not to contact the medium 10 so as not to stain the medium 10. That is, the swing arms 5a and 5b are urged by a spring (not shown) so as to abut on the studs 6 so that the ends thereof rise, but are urged by a small force so as not to lift the print head 3.

When printing the seal stamp 9 during printing, the detection rollers 7a and 7b are connected to the seal seal 9 as shown in FIG.
The swing arms 5a and 5b rotate so as to raise the tips by a small amount, and push up the print head 3 through the studs 6. Thereby, the print gap between the print head 3 and the medium 10 is secured also in the seal seal portion 9, and it is possible to prevent the travel of the ink ribbon from being hindered.

The above-described operation is performed even when one of the detection rollers 7a and 7b contacts only one side of the seal seal portion 9 as shown in FIG. Is valid. When printing is performed by moving the print head 3 in one direction, the present invention can be implemented using only one of the swing arms 5a and 5b and only one of the detection rollers 7a and 7b. For example, when printing is performed only when the print head 3 moves from right to left in FIG.
a and the detection roller 7a are unnecessary.

Further, the present invention can be applied to a medium whose thickness is partially increased, for example, an ID card on which a photograph is pasted, in addition to a cash register.

[0015]

As described above, according to the present invention, an appropriate printing gap can be ensured even in a particularly thick portion of a medium such as a seal portion of a bankbook, so that an ink ribbon is provided between the print head and the medium. Can be prevented from occurring, such as light prints and stains caused by hindering the running of the ribbon.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 shows a print head 3 of the form shown in FIG.
FIG. 7 is a front view showing an operation state when it comes over the seal seal part 9 of FIG.

FIG. 3 shows a print head 3 of the form shown in FIG.
FIG. 7 is a front view showing an operation state when it is in the vicinity of the seal seal part 9 of FIG.

FIG. 4 is a front view of a printing mechanism of a conventional printer.

[Description of Signs] 1 Carrier 2 Card Holder 3 Print Head 4 Spring 5a / 5b Swing Arm 6 Stud 7a / 7b Detection Roller 8 Platen 9 Seal Seal 10 Medium (Passbook) 11 Ink Ribbon

Claims (2)

(57) [Claims] A platen for backing a medium;
The carrier that moves parallel to the Latin
Opposed to the platen which can move within a certain range in a straight direction
Print head and a shaft fixed to the carrier.
Centered on the platen side
Swinging abuts the studs provided on the
Arm and the side of the swing arm parallel to the platen
Close to the print part by the print head
To the platen on the outer periphery.
Tip of the print head in a direction perpendicular to Latin
Between the platen side and the medium of normal thickness
With the detection roller located below the appropriate print gap
A printing mechanism for a printer, comprising: 2. The detecting roller of a printing section of a print head.
A pair is provided on both sides, corresponding to these pair of detection rollers.
And a pair of swing arms are provided.
The printing mechanism of the printer according to claim 1.