JPH0698811B2 - Printer - Google Patents

Description

The present invention relates to a printer, and more particularly to a printer that facilitates adjustment of a print head gap.

[Conventional technology]

In a conventional printing device, for example, JP-A-58-151277
As disclosed in Japanese Patent Laid-Open Publication No. JP-A-2003-264, in order to maintain an appropriate print gap necessary for obtaining print quality, in a printer which is urged to press the print head against the paper surface of the print paper, It has been known to insert a thin plate member between and. However, in this apparatus, there is a problem that the thin plate member stains the surface of the print medium immediately after printing, and improvement has been demanded.

[Problems to be Solved by the Invention]

On the other hand, in the apparatus disclosed in Japanese Patent Laid-Open No. 61-261075, the print head and the print head are printed by engaging a reference guide for urging the print medium and a part of the carrier on which the print head is mounted. The distance from the medium surface is kept constant.

In this device, the distance between the print head and the print medium is kept constant, and when the print paper changes,
There was a problem that the distance could not be easily adjusted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems in a conventional printing apparatus and adjust a distance between a print head and a print medium surface by a simple adjusting mechanism. It is to provide a printer having the.

[Means for Solving the Problems]

The above object of the present invention is to dispose a platen arranged parallel to the moving direction of the print head and capable of press-contacting a print medium facing the print head, a reference guide parallel to the platen, and a constant pressure. In a printing apparatus having a roller mechanism that follows the reference guide and keeps the distance between the print head and the print medium constant, between the print head and the roller mechanism, one or both of the print head and the roller mechanism are provided. Move the adjustment member with the contact surface as an inclined surface
Fixably assembled, with the movement and fixing of the adjusting member, the position of the inclined surface of the adjusting member in contact with the print head and the roller mechanism is changed to change the distance between the print head and the roller mechanism, It is achieved by a printing device characterized in that the distance between the print head and the print medium is adjusted.

[Action]

In the printing apparatus according to the present invention, the print medium is biased to the reference guide by the platen, and the reference roller of the roller mechanism is biased to the reference guide by the pressing unit via the print head. It is configured like this.
Further, the adjusting member transmits the force of the pressing portion from the print head to the holding portion of the roller mechanism holding the reference roller. Here, when the adjusting member is moved, the distance between the print head and the print medium surface can be finely adjusted by the action of the inclined surface as compared with the moving amount of the adjusting member.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a printing apparatus showing an embodiment of the present invention. In the figure, 1 is a print medium, 2 is a print head, 3
Is a carrier portion that holds the print head 2, 4 is a reference guide, 5 is a platen, 6 is a reference roller that rotates in contact with the reference guide 4, 7 is a holding member for the reference roller 6, and 8 is a holding member.
Indicates an adjusting member described later.

The printing medium 1 conveyed to the printing portion and positioned is moved in the arrow Z direction around the platen shaft 21 via the platen link 23 when the pair of left and right solenoids 22 are attracted in the arrow W direction during printing. The platen 5 attached to the platen bracket 20 presses against the reference guide 4.

The carrier unit 3 carrying the print head 2 holds the reference roller 6 via an adjusting member 8 and a holding member 7 which will be described later, is rotatable on a support rail 9 and is movable in the left and right directions. Supported by. In addition, the carrier unit 3
Is connected by a motor 13 and a drive belt 14 and is configured to be movable in the printing direction (horizontal direction). Further, pressure is applied from an upper frame 12 by a pressurizing unit 10, and the reference guide 4 causes the reference It is configured to urge the roller 6.

FIG. 2 shows the print head 2, adjustment member 8, and
The details of the holding member 7 and the reference roller 6 are shown. The adjusting member 8 has a hole 8d provided near one end thereof, and a pin above the holding member 7 for holding the reference roller 6 is provided.
The pin 7b is fitted to the pin 7b and is rotatable about the pin 7b in a horizontal plane. In addition, the hole 8d of the adjusting member 8
A gear 8c that meshes with the adjusting worm gear 11 provided on the upper portion of the holding member 7 is cut at the end opposite to
Further, the upper surface 8b of the adjusting member 8 is provided with the adjusting member 8 on the pin 7b.
So that when the holding member 7 is mounted on the print head 2 in a state of being held via the support member, the lower surface 8a of the adjusting member 8 is located above the holding member 7. It is configured so as to be in contact with and supported by the supporting surface 7a. The lower surface 8a of the adjusting member 8 and the upper supporting surface 7a of the holding member 7 are spiral surfaces centering on the pin 7b.

Print head 2, adjusting member 8, holding member 7 and reference roller 6
Is connected to the holding member 7 as described above.
By rotating the adjusting worm gear 11 provided in the upper part, the adjusting member 8 is rotated in the horizontal plane about the pin 7b above the holding member 7 through the hole 8d,
According to this rotation, the upper surface 8b of the adjusting member 8 can move the print head 2 up and down.

In this case, by increasing the gear ratio of the worm gear 11 and the gear 8c that meshes with the worm gear 11 and by reducing the spiral angle of the spiral surfaces 7a and 8a, the movement amount of the adjustment worm gear 11 and the adjusting member 8 can be reduced. Thus, the amount of vertical movement of the print head 2 can be easily and finely adjusted. Further, although the movement of the adjusting member 8 due to the force in the compression direction is suppressed due to the characteristics of the worm gear, it is possible to obtain a further holding effect by using an adhesive or the like for temporarily fixing the gear portion.

In this embodiment, the holding member 7 is made of resin,
The print head 2 is fixed to the nose portion 2a of the print head 2 by a snap fit, and is used as a guide when the ink ribbon 25 laid over the ribbon guides 24, 24 is loaded.

In the above-described embodiment, the spiral surfaces 7a and 8a of the holding member 7 and the adjusting member 8 are configured to slide, but one of them is a spiral surface and the other is, for example, a shaft for fixing a roller. It doesn't matter.

Similarly, various other embodiments of the present invention are possible.

〔The invention's effect〕

As described above, according to the present invention, the platen arranged parallel to the moving direction of the print head and capable of press-contacting the print medium facing the print head, and the reference guide parallel to the platen. In a printing apparatus having a roller mechanism that follows the reference guide at a constant pressure and keeps the distance between the print head and the print medium constant, between the print head and the roller mechanism, the print head or the roller mechanism is provided. A printing device having a simple adjustment mechanism for adjusting the distance between the print head and the print medium surface, since an adjusting member having an inclined surface that contacts one side or both sides is incorporated so as to be movable and fixed. This is a remarkable effect that can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a printing apparatus showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the main parts thereof. 1: print medium, 2: print head, 3: carrier part, 4: reference guide, 5: platen, 6: reference roller, 7: holding member, 7a: upper surface (spiral surface), 7b: pin, 8: adjusting member , 8a: Lower surface (spiral surface), 8b: Upper surface, 8c: Gear, 8d: Hole, 9: Support rail, 1
0: Pressure part, 11: Worm gear.

Claims (1)

[Claims] 1. A print head is arranged in parallel with a moving direction of the print head,
Further, a platen configured to be capable of press-contacting the print medium facing the print head, a reference guide parallel to the platen, and the reference guide at a constant pressure are used as the reference guide to keep the distance between the print head and the print medium constant. In a printing device having a roller mechanism for keeping, an adjusting member having a sloped surface in contact with one or both of the print head and the roller mechanism is movably and fixedly incorporated between the print head and the roller mechanism, As the adjusting member is moved and fixed, the position of the inclined surface of the adjusting member that is in contact with the print head and the roller mechanism is changed to change the distance between the print head and the roller mechanism. A printing device characterized by adjusting a distance from a medium.