JP2536870Y2 - Serial printer - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a serial printer in which a print head arranged opposite to a platen is mounted on a carrier, and the carrier is movably supported by a pair of guide shafts extending in parallel with the platen. About.

[0002]

2. Description of the Related Art In a serial printer, a print head arranged opposite to a platen is mounted on a carrier, and the carrier is movably supported by a pair of guide shafts extending in parallel with the platen. A recording paper is fed between the recording head and the print head so that printing can be performed by the print head.

[0003] In such a serial printer, the interval between the platen and the print head is very small, and it is difficult to perform a paper jam operation and an ink ribbon cassette installation operation. Therefore, the present applicant has proposed a serial printer that can increase the distance between the platen and the print head as necessary at the time of paper jam processing or at the time of mounting an ink ribbon cassette (Japanese Patent Application No. 2-1331).
No. 88). According to this structure, one guide shaft is provided so as to be able to engage with and disengage from the carrier, and when the guide member is disengaged from the carrier, the carrier is rotatable around the other guide member and the print head is attached to the platen. You can move away from it.

[0004]

However, in this structure, in order to increase the distance between the platen and the print head,
Not only does one guide shaft separate from the carrier,
After that, it is necessary to rotate the carrier, and there is a problem that operability is poor.

An object of the present invention is to provide a serial printer that can increase the distance between the platen and the print head by a simple operation.

[0006]

According to the present invention, a print head arranged opposite to a platen is mounted on a carrier, and the carrier is movably supported by a pair of guide shafts extending in parallel with the platen. In a serial printer, the carrier is provided with an engagement receiving portion in which one of the two guide shafts can be disengaged from a direction orthogonal to the extending direction thereof, and the one guide shaft is displaceably supported. Attached to the movable member, the movable member is moved to an engagement position with the engagement receiving portion and a disengagement position by the displacement of the movable member, and is movable between the carrier and the movable member in conjunction with the displacement of the movable member. An interlocking member that rotates the carrier around the other guide member in a direction in which the print head separates from the platen when one guide shaft reaches the disengaged position from the engagement position when the movable member is displaced. Provided it is characterized by being provided.

[0007]

According to the present invention, when one of the guide shafts reaches the disengaged position from the engagement position when the movable member is displaced, the carrier is rotated around the other guide member by the interlocking member, and printing is performed by this rotation operation. The head is separated from the platen.

[0008]

1 to 3 show a serial printer to which the present invention is applied.

In this serial printer, a paper cassette 3 for accommodating recording paper 2 is mounted in a printer case 1 as shown in FIG.
Is supplied to the printing mechanism unit 4 for printing.

A picking roller 5 is disposed above the paper cassette 3 so as to face the paper cassette 3.
Thereby, the recording paper 2 is taken out from the paper cassette 3. The picking roller 5 is rotated and driven by a driving force of a picking motor (not shown) to apply a conveying force to the recording paper 2, and the recording paper 2 is taken out of the paper cassette 3 by receiving the conveying force.

On the upstream and downstream sides of the printing mechanism 4,
A paper feed roller 6 and a paper discharge roller 7 are arranged, respectively, and the recording paper 2 is printed by the paper feed roller 6 on the printing mechanism 4.
To the recording paper 2 after printing by the discharge roller 7
Is discharged from the paper discharge port 8 to the outside of the printer case 1.

The paper discharge port 8 is formed in the opening / closing lid 9 of the printer case 1 and is used for discharging the recording paper 2 in opposition to the paper discharge roller 7 with the opening / closing lid 9 closed.

An opening / closing lid 9 is rotatably supported by a printer frame 10 in the printer case 1 via a pin 11.
It is rotated around the pin 11 to be opened and closed. Side plates 10a are erected on both sides of the printer frame 10 (one side plate 9a is not shown in FIGS. 1 to 3), and the opening / closing lid 9 is rotated on both side plates 10a via pins 11. It is supported as much as possible.

The paper feed roller 6 and the paper discharge roller 7 are driven by a driving force of a paper feed motor (not shown), and are driven by driving rollers 6a, 7a and 6a, 7 respectively.
a) and driven rollers 6b and 7b pressed against
The recording paper 2 can be nipped and conveyed. The recording paper 2 is fed to the printing mechanism section 4 by receiving the conveying force, and is discharged from the paper discharge port 8 after printing. The discharge roller 7 has a driving roller 7a rotatably supported on both side plates 10a of the printer frame 10 while a driven roller 7b is rotatably supported on the back surface of the opening / closing lid 9 via a bracket 12. As shown in FIG. 2, the driven roller 7b is separated from the driving roller 7a by the opening operation of the opening / closing lid 9. The drive roller 6a and the driven roller 6b of the paper feed roller 6 are both rotatably supported on both side plates 10a of the printer frame 10.

The printing mechanism 4 is provided with a platen 13 and a print head 14 above the platen 13 and facing the platen 13.
4, the recording paper 2 is fed and used for printing. The platen 13 is provided between both side plates 10a of the printer frame 10 via fixing means (not shown) along a direction perpendicular to the paper feeding direction. Print head 1
4 is mounted on the carrier 15 so that it can move integrally with the carrier 15.

The carrier 15 is driven to run parallel to the platen 13 by the driving force of a carrier motor (not shown). Above the carrier 15, an ink ribbon cassette 16 is mounted, and a platen 13 and a print head 14 are attached.
An ink ribbon 17 (shown in FIG. 3) is inserted between the ink ribbon 17 and the ink ribbon. The ink ribbon cassette 16 can be attached and detached with the cover 9 opened.

The carrier 15 is slidably fitted to a pair of guide shafts 18 and 19 extending in parallel with the platen 13, and is mounted on both side plates 10 a of the printer frame 10 via these guide shafts 18 and 19. It is movably supported in parallel with. The bearings of the carrier 15 and the guide shaft 18 of the printer frame 10 are U-shaped engaging recesses 20 and 21, respectively, so that the guide shaft 18 can be engaged and disengaged from the radial direction. Guide shaft 18
Is attached to the back surface of the opening / closing lid 9 via a bracket 9a.
And can be detached from the engagement recess 21 of the printer frame 10. Guide shaft 18 of bracket 9a
3 is set to be larger than the diameter of the guide shaft 18 as shown in FIG.
The guide shaft 18 is positioned with respect to the guide shaft 19 with high precision by the engagement of the guide shaft 18 with the guide shaft 1.

An inclined surface 22 is formed at an end of the carrier 15 on the bearing portion side of the guide shaft 19, and a roller 23 as an interlocking member is opposed to the inclined surface 22 as a platen 13.
The carrier 15 extends over the entire moving region of the carrier 15. The rollers 23 are rotatably supported on one end of a link 25 via pins 24 on both sides of the printer frame 10, respectively, and are supported on both side plates 10 a of the printer frame 10 via the link 25. The link 25 is connected to the side plate 1 of the printer frame 10 through a pin 26 at an intermediate portion.
One end of a link 28 is rotatably supported via a pin 27 at an end opposite to the mounting side of the roller 23. The other end of the link 28 is an open / close lid 9
Is rotatably supported via a pin 29 on the back surface of
The roller 23 moves around the pin 26 via the links 25 and 28 in conjunction with the opening / closing operation of the opening / closing lid 9. By the movement of the roller 23, when the opening / closing lid 9 is opened, the guide shaft 18 separates from the engagement recess 20 of the carrier 15 and at the same time, the roller 23
5, the carrier 15 is pressed by the roller 23, and the carrier 15 is rotated around the guide shaft 19 in the direction of arrow A (the direction in which the print head 14 is separated from the platen 13). When the cover 9 is closed, the carrier 15 is moved by the weight of the guide shaft 1 due to the movement of the roller 23.
Nine turns are made in the direction of arrow B (the direction in which the print head 14 approaches the platen 13).

According to the above configuration, when the lid 9 is opened, the guide shaft 18 is disengaged from the engagement recess 20 of the carrier 15 on the way, and the carrier 15 can rotate around the guide shaft 19. At the same time, the roller 23 comes into contact with the inclined surface 22 of the carrier 15, and is pressed by the roller 23 to rotate the carrier 15 around the guide shaft 19 in the direction of arrow A, as shown in FIG. Then, the print head 14 is separated from the platen 13. When the cover 9 is closed from this state, the carrier 15 is rotated by its own weight around the guide shaft 19 in the direction of arrow B with the movement of the roller 23, and the engagement recess 20 of the carrier 15 and the engagement recess of the printer frame 10. The guide shaft 18 is engaged with 21,
With the opening / closing lid 9 closed, as shown in FIG.
5 is a printer frame 10 via guide shafts 18 and 19.
Are supported by both side plates 10a.

Since the roller 23 is extended over the entire moving area of the carrier 15, the carrier 15 can be moved to an arbitrary position by opening the cover 9.
By rotating the print head 14 around, the print head 14 can be separated from the platen 13.

Further, since the roller 23 is rotatably supported at one end of the link 25 via the pin 24, the roller 23 rotates due to frictional resistance with the inclined surface 22 of the carrier 15 when the carrier 15 rotates. The carrier 15 can be smoothly rotated by being moved, and the opening and closing lid 9 can be opened and closed without great resistance.

As described above, in the present embodiment, the print head 14 is moved to the platen 1 by a simple operation of opening the opening / closing lid 9.
3, the distance between the print head 14 and the platen 13 can be increased, and the processing for paper jams and the mounting of the ink ribbon cassette 16 become extremely easy.

In the above embodiment, the roller 23 is extended over the entire moving area of the carrier 15, but the roller 2 is provided on the slope 22 of the carrier 15 only at the home position.
3 may be opposed to each other.

In the above embodiment, the links 25, 28
The roller 23 is moved in conjunction with the opening / closing operation of the opening / closing lid 9 through the opening / closing operation. By this movement, when the opening / closing lid 9 is opened, the carrier 15 is rotated to separate the print head 14 from the platen 13. Alternatively, the carrier 15 may be rotated in a direction in which the print head 14 separates from the platen 13 when the cover 9 is opened by using another interlocking member such as a cam that is linked to the opening and closing operation of the cover 9. .

In the above embodiment, the guide shaft 18 is attached to the opening / closing lid 9, but a separate lever is provided in the printer case 1, the guide shaft 18 is attached to this lever, and the guide shaft 18 is moved by the operation of the lever. 15 engagement recesses 20
Alternatively, the engaging recess 21 of the printer frame 10 may be disengaged.

[0026]

As described above, according to the serial printer according to the present invention, the interval between the platen and the print head can be increased by a simple operation, and the processing operation at the time of paper jam and the ink ribbon cassette can be performed. Has an excellent effect that the mounting work of the device becomes extremely easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a serial printer to which the present invention is applied.

FIG. 2 is a longitudinal sectional view of a main part showing an open state of an opening / closing lid of FIG. 1;

FIG. 3 is a sectional view taken along line CC of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer case 9 Opening / closing lid (movable member) 13 Platen 14 Print head 15 Carrier 18, 19 Guide shaft 20 Engagement recess 23 Roller (interlocking member)

Claims (2)

(57) [Scope of request for utility model registration] 1. A serial printer in which a print head arranged opposite to a platen is mounted on a carrier, and the carrier is movably supported by a pair of guide shafts extending in parallel with the platen. An engagement receiving portion is provided in which one of the two guide shafts can be disengaged from a direction orthogonal to a direction in which the guide shaft extends, and the one guide shaft is attached to a movable member supported so as to be displaceable. The movable member moves to an engagement position and a disengagement position with the engagement receiving portion by the displacement of the movable member, and is movable between the carrier and the movable member in conjunction with the displacement of the movable member, When the one guide shaft reaches the disengaged position from the engaged position when the movable member is displaced, the carrier is moved in the direction in which the print head separates from the platen. A serial printer, comprising an interlocking member for rotating around an id member. 2. The apparatus according to claim 1, wherein the movable member is an opening / closing lid of a printer case, and the one guide shaft is moved to the disengagement position with the engagement receiving portion by opening the opening / closing lid. A serial printer wherein the opening / closing lid moves to the engagement position with the engagement receiving portion by the closing operation of the lid, and the interlocking member moves in conjunction with the opening / closing operation of the opening / closing lid.