JP3260852B2 - Print head fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print head fixing structure.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 3-87280 discloses a structure in which a print head is fixed to a carriage. A base on which the print head is fixed is slidable in a direction perpendicular to the printing surface of the recording paper. After being mounted, the base is positioned so as to be pressed against the carriage via a telescopic member.

This type is excellent as a mechanism capable of accurately adjusting the position of the platen gap. However, not only is it impossible to tilt the print head with respect to the platen axis, nor to position the print head in a direction parallel to the printing surface of the recording paper. The ink jet print head has a problem in that the connection between the ink cartridge and the carriage is not always sufficient.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a new print head fixing structure capable of accurately performing not only adjustment of a platen gap but also positioning of a recording paper in a printing surface direction or a platen axis direction.

Another object of the present invention is to provide a new print head fixing structure which enables simultaneous connection with an ink cartridge for supplying ink to an ink jet print head. .

[0006]

That SUMMARY OF THE INVENTION The present invention is written
In order to achieve such a problem, a printhead fixing structure of a type in which the printhead is fixed to the carriage via the head substrate to which the printhead is fixed, on one side of the carriage,
A guide shaft with a projection on the side opposite to the guide shaft
Equipped with a sleeve for penetration and prints the head substrate
A positioning portion for positioning in a direction perpendicular to the surface, a portion for holding a part of the carriage in a direction parallel to the printing surface on a part of the head substrate, and a carriage urged by an urging member. is obtained by projecting portions provided on the guide shaft through sleeve of the upper and abutting portion, the ink cartridge connecting and Lee <br/> and a portion for positioning the ink cartridge in each set <br/> takes as .

[0007]

Embodiments of the present invention will be described below. The drawings all show one embodiment of the present invention.

In the box-shaped carriage indicated by reference numeral 60 in the drawing, sleeve portions 63, 63 through which a guide shaft penetrates are provided on both sides of the bottom plate near the platen, and counter guides of the sleeve portions 63, 63 are provided. A first block portion 72 to be described later is provided on a side surface on the shaft side via a spacer S.
The protruding portions 66, 66 with which the front surface 72b abuts are protruded.

In the bottom plate, these convex portions 66,
A pair of square holes 64, 64 for inserting the first hook portions 72 are formed in the counter guide shaft side corresponding to the first hook portions 66, and the first hook portions 72 are formed in the upper surface on the counter guide shaft side. A pair of protrusions 6 against which the tongue piece 72a is pressed.
As shown in FIGS. 1 and 3, the bottom plate has locking projections 68 for supporting both ends of a rod-shaped spring 62, which will be described later, on both sides on the side opposite to the guide shaft. 68 are provided.

Reference numeral 65 in the figure denotes a head insertion hole for projecting the print head 70 toward the platen, 65a.
Represents concave notches for inserting the second hook portions 73 provided on both sides of the hole 65, and 69 represents a detected portion for detecting the home position position of the carriage 60.

On the other hand, reference numeral 71 in the figure denotes a head substrate on which a print head 70 is integrally supported on the lower surface. On the guide shaft side of the substrate 71, a sleeve portion 63 is held between the substrate 71 and the substrate. Then, a pair of L-shaped first hook portions 72 for attaching the substrate 71 in the Y direction in the drawing, that is, the direction parallel to the printing surface of the recording paper, are formed to extend downward,
Further, the first hook portion 72 has a tongue piece 72a extending toward the side opposite to the guide shaft.
The substrate 71 is fixed by pressing the 2a against the above-mentioned protrusion 67 on the carriage bottom plate.

The bottom plate 71 is also formed with a second L-shaped hook portion 73 protruding from the lower surface on the side opposite to the guide shaft, and cooperates with the first hook portion 73 to hold the head substrate 71 on the recording paper. It is configured to be fixed in a direction parallel to the printing surface, and further, on the opposite side of the guide shaft,
A cylindrical positioning projection 75 is formed to protrude upward, and as shown in FIGS.
Into the long hole 135 of the carriage cover 130, and an ink cartridge ( not shown) on the carriage cover 130.
The ink cartridge is positioned in the direction of the printing surface of the recording paper, and the seal of the ink cartridge is pierced by a needle 75a protruding from the center of the protrusion 75, so that the ink cartridge is connected to the print head 70. . 6 and FIG.
Reference numeral 7 denotes a carriage cover attached to the carriage.
The carriage cover 130 has a
Round holes 60b, 6 provided on the positioning projection 75 side of the
0b, the pins 131, 131, and the carriage 60
Engage with square holes 60c, 60c (see FIG. 4) opened in the side wall of
Claw portions 132, 132 are provided.
Receives the positioning projection 75 erected on the head substrate.
A long hole 135 is provided, and the pin 131 is inserted into the round hole 60b.
And then engage the claw 132 with the square hole 60c.
To be fixed to the carriage 60.
And a direction orthogonal to the pressing direction of the spring member 62.
(Arrows X1, X2).
When the carriage cover 130 is attached,
And Y2 directions of the mounting board 71 with respect to the carriage 60
And positioning in X1 and X2 directions in addition to Z1 and Z2 directions
Is carried out, and as a result,
The pad 70 is securely positioned with respect to the carriage 60.
Will be. In the figure, reference numeral 133 denotes a box shape.
134 is an ink cartridge mounting section, and 134 is an ink car.
The lever for fixing the cartridge is shown.
Reference numeral 75c denotes an ink flow path provided at the center of the needle 75a.
ing.

In the embodiment configured as described above, to mount the head substrate 71 on the carriage 60, first, a spacer S is mounted on the surface of the first hook portion 72 on the guide shaft side. The second hook portions 72 and 73 are respectively inserted into the square holes 64 provided in the bottom plate of the carriage 60 and the concave portions 65a on both sides of the head insertion hole 65, and the head substrate 71 is printed in the Y direction, that is, recording paper is printed. By displacing in the plane direction, the sleeve portion 63 and the bottom plate 60a of the carriage are held by the back surface portion of the substrate 71 corresponding to each hook portion 72, 73, and at the same time, the tongue piece 72a of the first hook portion 72 is moved to the bottom plate of the carriage 71. The head substrate 71 is fixed on the carriage 60 by being pressed against the protrusion 67 provided on the carriage 60.

In this state, as shown in FIGS. 1 and 3, the central portion 62a of the bar spring 62 is engaged with the engaging portion 75b of the positioning projection 75 while resisting the spring force. When the both ends of the rod-shaped spring 62 are locked to the locking protrusions 68 of the carriage 60 while being relaxed, the head substrate 71 is displaced in the Y1 direction in the drawing, and the left and right sleeve portions 63 are moved.
The print head 70 is correctly positioned in the print surface direction of the recording paper so that the spacer S is sandwiched between the convex portions 66 provided on the recording paper.

When it is necessary to change the position of the head substrate 71 with respect to the carriage 60, that is, the position of the print head 70, or when the processing accuracy and the assembly accuracy of the carriage 60 and the head substrate 71 are deviated. In this case, by appropriately selecting the spacers S having different thicknesses, the position of the print head 70 with respect to the print surface A1 can be appropriately adjusted, and the print quality can be improved.

[0016]

As described above, according to the present invention, the print head is transported via the head substrate to which the print head is fixed.
As a fixing structure of the print head that is fixed to the ridge,
A part that holds a part of the carriage in a direction parallel to the print surface, and a part that is urged by the urging member.
A portion that comes into contact with the protrusion provided on the guide shaft penetration sleeve, the connection of the ink cartridge and the ink cartridge;
Tsu is provided with the portion for positioning the di-, the print head via the head substrate, as well the gap between the printing surface, be correctly positioned and held in a direction perpendicular to the printing surface parallel orientation and the guide shaft As a result, higher quality recording and writing can be performed on the recording paper.

[0017] Moreover, since so as to abut the head substrate to the convex portion provided on the guide shaft through Yosu sleeve portion, the axis of the special guide shaft head substrate through a convex portion without providing a member Positioning can be performed correctly in the orthogonal direction. Further, by providing the connection portion with the ink cartridge and the positioning portion on the carriage, all of these positionings can be performed simultaneously by the portion on the carriage.

[Brief description of the drawings]

FIG. 1 is a plan view showing a carriage and a head substrate according to an embodiment of the present invention.

FIG. 2 is a bottom view showing essential parts of the same.

FIG. 3 is a side view showing a main part of the same in a cross section.

FIG. 4 is a perspective view showing the same carriage.

FIG. 5 is a plan view showing a state where a carriage cover is attached to the carriage.

FIG. 6 is a side view showing the above state.

[Explanation of symbols]

 Reference Signs List 60 carriage 62 spring on rod 63 sleeve part 68 locking part 70 print head 71 head substrate 72 first hook part 73 second hook part 75 positioning part 130 carriage cover

Claims (4)

(57) [Claims] A print head fixing structure of a type in which the print head is fixed to a carriage via a head substrate to which the print head is fixed, is provided on one side of the carriage so as to protrude from a side surface opposite to the guide shaft.
With the guide shaft penetration sleeve part provided with
In both cases, the head substrate is positioned in the direction perpendicular to the printing surface.
And a positioning part, and a part of the head substrate,
A portion for holding a part of the carriage in a direction parallel to a printing surface, a portion for abutting a projection provided on a guide shaft penetrating sleeve on the carriage in a state of being urged by an urging member, and A printhead fixing structure provided with a portion for connecting a cartridge and positioning the ink cartridge. 2. The print head fixing structure according to claim 1, wherein a part of said head substrate is brought into contact with said convex portion via a spacer. 3. The ink cartridge according to claim 1, wherein
2. The printhead fixing structure according to claim 1, wherein said printhead fixing structure is positioned and held on a part of said head substrate via a carriage cover having a cartridge mounting portion . 4. The fixing of the print head according to claim 1, wherein a part of the head substrate is brought into contact with the projection by a rod-shaped spring member having both ends locked to both sides of the carriage. Construction.