JP3482987B2 - 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 structure for fixing a print head (hereinafter also simply referred to as a head) in a printer or the like.

[0002]

2. Description of the Related Art Generally, a head of a printer or the like is
It is fixed to the carriage that is the object to be fixed,
Printing is performed by the head as the carriage is guided by the guide shaft and reciprocates.

The conventional structure for fixing the head to the carriage is a structure in which the head is simply fixed to the carriage with screws.

[0004]

Since the conventional fixing structure has a structure in which the head is simply fixed to the carriage with screws, the position of the head with respect to the carriage will be changed when a shock is applied to the printer, for example. There was a problem of slipping. In addition, when the carriage reciprocates many times due to long-term use of the printer or the like, there is a problem that the position of the head with respect to the carriage gradually shifts due to vibration due to the reciprocation.

When the position of the head with respect to the carriage deviates, the printing position also deviates, and the printing quality deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a head fixing structure capable of preventing the head from being displaced with respect to a fixing object such as a carriage.

[0007]

In order to achieve the above object, a head fixing structure according to claim 1 is a structure for fixing a print head to an object to be fixed, wherein the print head and the object to be fixed are in contact with each other. Among the contact surfaces, at least a part of one contact surface is formed with a large number of sharp projections that bite into the other contact surface by transfer processing, and the other contact surface has the sharp projections. It is characterized in that a concave portion for accommodating is not provided.

According to a second aspect of the present invention, there is provided a head fixing structure according to the first aspect, wherein the print head and the fixing object are fastened and fixed by a screw, and at least the peripheral portion of the screw is provided with the plurality of the print heads. It is characterized in that the sharp protrusions are formed.

The head fixing structure according to claim 3 is the head fixing structure according to claim 1 or 2, wherein the material of the print head in the fixing portion between the print head and the fixing object is a synthetic resin, and the material of the fixing object. Is aluminum,
The large number of sharpened protrusions are formed on the side of the fixing target.

[0010]

According to the head fixing structure of claim 1,
Among the contact surfaces of the print head and the fixed object, at least a part of at least one contact surface is subjected to transfer processing ,
A large number of sharpened protrusions that bite into the other contact surface are formed, and since the recessed portion for accommodating the sharpened protrusion is not provided on the other contact surface, the contact between the print head and the fixed object The coefficient of friction between the surfaces increases.

Therefore, the displacement of the head with respect to the fixed object can be prevented.

Moreover, since the large number of sharpened protrusions are formed by transfer processing, they can be formed effectively and easily.

According to the head fixing structure of the second aspect,
2. The head fixing structure according to claim 1, wherein the print head and the fixing object are tightened and fixed by screws, and the multiple sharpened protrusions are formed at least in the peripheral portion of the screws, and therefore the tightening by screws is performed. The friction coefficient between the abutting surfaces of the print head and the fixing target in the vicinity of the fixing unit is increased, so that the displacement of the head with respect to the fixing target can be prevented more effectively.

According to the head fixing structure of the third aspect,
The head fixing structure according to claim 1 or 2, wherein the material of the print head in the fixing portion between the print head and the fixing target is synthetic resin, and the material of the fixing target is aluminum, and Since the sharp protrusion is formed, the friction coefficient between the contact surfaces of the print head and the fixing target can be further increased, and therefore,
It is possible to more effectively prevent the displacement of the head with respect to the fixed object.

Moreover, since the large number of sharpened protrusions are formed by transfer processing on the side of the fixing object made of aluminum, they can be formed more effectively and easily.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B are views showing a carriage on which a head is mounted by using an embodiment of a head fixing structure according to the present invention. FIG. 1A is a plan view and FIG. 1B is a sectional view taken along the line bb in FIG.
Sectional drawing, (c) is a conceptual sectional view which expanded and showed a part of figure (b).

In FIGS. 1A and 1B, 10 is a print head, 20 is a carriage plate as an object to be fixed,
30 is a carriage.

In this embodiment, the print head 10 is
Two of 10 (L) and 10 (R) are mounted on the carriage 30, but unless otherwise necessary, these will be collectively referred to as a "print head 10". In addition, the same applies to the parts to which (L) and (R) are attached in the parts described below.

The print head 10 is an ink jet head and has a head body 11 and a base body 12 made of synthetic resin to which the head body 10 is integrally attached.

On the lower surface 11a of the head main body 11, there is provided a nozzle row composed of a plurality of nozzles (not shown), and ink droplets are ejected from the nozzles.

The substrate 12 is provided with an ink supply needle 13 communicating with the nozzle. In addition, the base 12 includes
Mounting portion 14 for mounting an ink cartridge (not shown)
When the ink cartridge is mounted on the mounting portion 14, the ink supply needle 13 is inserted into the mouth of the ink cartridge, and the ink in the ink cartridge is supplied to the nozzle through the ink supply needle 13. It is supposed to be done. One print head 10 (L)
Of the three ink supply needles 13 (B
K), 13 (C), and 13 (M) are provided, and black (BK), cyan (C), and magenta (M) inks are provided for each color from the ink cartridges through the ink supply needles. Supplied to the nozzle row. Further, the base 12 (R) of the other print head 10 (R) has three ink supply needles 13 (Lc), 13 (Lm),
13 (Y) are provided, and light cyan (L
Ink of c), light magenta (Lm), and yellow (Y) are supplied to the nozzle rows provided for each color.

That is, these print heads 10 (L),
With 10 (R), ink droplets of a total of 6 colors can be ejected from a total of 6 nozzle rows, and a high-resolution full-color image can be formed.

FIG. 2 is a plan view of the carriage plate 20,
FIG. 3 is a plan view showing a state in which the head 10 is mounted on the carriage plate 20.

The carriage plate 20 is made of an aluminum plate, and has an opening 21 into which the main body 11 of the head 10 is inserted and a support surface 22 for supporting the base 12 of the head 10, as shown in FIGS. is doing.

At the inner edge of the opening 21, one head 10 is provided.
The positioning portion 23 (L) that comes into contact with the front surface of the (L) and positions in the front-back direction (the direction of the arrow Y in FIG. 3) and the front surface of the other head 10 (R) that comes in the front-back direction (FIG. 3). Positioning unit 23 for positioning in the Y direction)
(R) are formed.

Positioning in front of the support surface 22 (upper side in FIG. 2) engages with the notch 15 (L) of one head 10 (L) to perform positioning in the left-right direction (direction of arrow X in FIG. 3). A pin 24 (L) and a positioning pin 24 (R) which engages with the notch 15 (R) of the other head 10 (R) and positions the head in the left-right direction (direction of arrow X in FIG. 3) are formed. (See FIG. 3 (c)).

At the inner edge of the opening 21, a mounting portion 26 for mounting compression coil springs 25 (L) and 25 (R) is provided.
(L) and 26 (R) are provided, and the head 10
(L) and 10 (R) and the compression coil springs 25 (L) and 25 (R) respectively mounted between the head 10 and
Are biased toward the positioning portion 23 and the positioning pin 24, respectively. Further, behind the support surface 22 (lower side in FIG. 2), there are levers 27 (L), 27 for finely adjusting the head position.
(R) support shafts 28 (L) and 28 (R) are provided. An eccentric cam 27a is formed on the lever 27, and the cam surface of the eccentric cam 27a is in contact with the side surface of the projecting piece 16 formed on the head 10.

Therefore, when the lever 27 is rotated,
The head 10 includes the positioning portion 23 and the positioning pin 2
The head 10 is rotated while being in contact with the head 4, so that the position of the head 10 can be finely adjusted.

The head 10 is fixed to the carriage plate 20 with screws 31. Note that FIG.
In (c), 35 is a plain washer and 29b is a screw hole.

The supporting surface 22 has a very small thickness portion 29.
(L) and 29 (R) are formed, and as a result, the upper surface 29a slightly raised from its surroundings (see FIG. 1).
(See (c)) is formed. This upper surface 29 a is the base 12 of the head 10 in the fixing portion 32 with the head 10.
Bottom surface (abutting surface on the head side , which will be described later in detail).
A concave portion for accommodating 9c constitutes a contact surface with a contact surface not provided ).

The contact surface 29a is shown in FIGS. 4 (a) and 4 (b).
As shown in FIG. 5, the entire surface is subjected to transfer processing, and by this transfer processing, a large number of sharpened protrusions 29c are formed. In this embodiment, a large number of quadrangular pyramid-shaped projections are formed on a punch-shaped surface (not shown), and the projections are formed on the contact surface 29.
By pressing it against a, a large number of inverted quadrangular pyramidal recesses 29d are formed on the surface of the contact surface 29a, and as a result of the formation of these recesses 29d, the sharp protrusions 29c are formed by the portions that partially project at the edges 29e. Has been formed. The inverted quadrangular pyramid-shaped recess 29d has a side length L of about 150 μm, a depth D of about 75 μm, and vertical and horizontal pitches P1 and P2 of about 300 μm.

FIG. 5 is a plan view of the carriage 30.

The carriage 30 is made of synthetic resin and has screw holes 33 and 34 for fixing the carriage plate 20.

To fix the head 10 to the carriage 30, for example, the following is performed.

First, the carriage plate 20 to which the lever 27 is attached in advance is inserted through the opening 36 (see FIG. 1B) formed in the rear portion of the carriage 30, and the carriage plate 20 is inserted into the screw holes 33, 34 and the drawing. It is completely fixed to the carriage 30 by using a screw.

Next, the heads 10 (L) and 10 (R)
Is attached to the carriage plate 20 as shown in FIG. 3, and the compression coil spring 25 is also attached. At this time, screw 31
Is lightly tightened to temporarily fix the head 10 and the carriage plate 20.

Then, the lever 27 is rotated to move the head 1
The position of 0 is adjusted and the screw 31 is strongly tightened to completely fix the head 10 and the carriage plate 20. By tightening the screw 31 strongly, the sharp protrusion 29c
Is crushed to some extent while biting into the lower surface of the base body 12 of the head.

According to the head fixing structure as described above, the following operational effects can be obtained.

[0040] (a) of the abutment surface of the carriage plate 20 as a fixed object and the print head 10, on at least one abutment surface 29a, by the transfer processing, the other abutment
Many sharp protrusions 29c bites into the surface is formed,
Moreover, since the other contact surface is not provided with a recess for accommodating the sharp projection 29c, the friction coefficient between the contact surfaces of the print head 10 and the carriage plate 20 increases.

Therefore, the displacement of the head 10 with respect to the carriage plate 20 can be prevented. Moreover, since the large number of sharpened protrusions 29c are formed by transfer processing, they can be effectively and easily formed.

(B) A structure in which the print head 10 and the carriage plate 20 are fastened and fixed by screws 31, and the contact surface 29 is at least the peripheral portion of the screws 31.
Since a large number of sharpened protrusions 29c are formed on a, the coefficient of friction between the contact surfaces of the print head 10 and the carriage plate 20 in the vicinity of the fastening portion fixed by the screws 31 increases, and therefore the carriage is more effectively carried out. Plate 20
It is possible to prevent the displacement of the head 10 with respect to.

(C) The material of the print head 10 in the fixing portion 32 between the print head 10 and the carriage plate 20, that is, the material of the substrate 12 is synthetic resin, the material of the carriage plate 20 is aluminum, and a large number of them are provided on the carriage plate 20 side. Since the sharp protrusions 29c are formed, the coefficient of friction between the contact surfaces of the print head 10 and the carriage plate 20 can be further increased, and therefore the head 10 with respect to the carriage plate 20 can be more effectively. Displacement can be prevented.

Moreover, since the large number of sharpened protrusions 29c are formed on the side of the carriage plate 20 made of aluminum by the transfer process, they can be formed more effectively and easily.

In this embodiment, even if the displacement of the head 10 with respect to the carriage plate 20 is prevented, if the carriage plate 20 is displaced with respect to the carriage 30, the printing position will be displaced. Since the 20 is firmly fixed to the carriage 30 with a plurality of screws or the like, there is usually no deviation. There may be an idea that the head 10 should also be firmly fixed to the carriage plate 20 with a plurality of screws as well, but as described above, the position of the head 10 is in the state of being mounted on the carriage. Fixing with multiple screws is not desirable because it requires fine adjustment. This is because it becomes difficult to perform fine adjustment, and when tightening a plurality of screws after the adjustment, the position of the head 10 may be displaced again. Such a situation is the same when the head 10 is directly fixed to the carriage.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be appropriately made within the scope of the gist of the present invention.

For example, in the above embodiment, the sharp protrusion 29c is formed on the entire contact surface 29a, but it may be formed on a part thereof.

In the above embodiment, the sharp protrusion is formed on the carriage plate 20 side, but it may be formed on the head 10 side. In this case, it is desirable that at least the contact surface of the base body 12 of the head with the carriage plate is a metal surface.

[0049]

The head fixing structure according to any one of claims 1 to 3 can prevent the head from deviating from the fixed object. Moreover, since a large number of sharpened protrusions are formed by transfer processing, they can be effectively and easily formed.

Further, according to the head fixing structure of the second aspect, it is possible to more effectively prevent the displacement of the head with respect to the fixed object.

According to the head fixing structure of the third aspect,
It is possible to more effectively prevent the displacement of the head with respect to the fixed object. Moreover, since the large number of sharpened protrusions are formed on the fixing target side made of aluminum by transfer processing, they can be formed more effectively and easily.

[0052]

[Brief description of drawings]

FIG. 1 is a diagram showing a carriage on which a head is mounted by using an embodiment of a head fixing structure according to the present invention.
Is a plan view, (b) is a bb sectional view in FIG.
(C) is a conceptual sectional view showing a part of FIG.

FIG. 2 is a plan view of a carriage plate 20.

FIG. 3 is a plan view showing a state in which a head 10 is mounted on a carriage plate 20.

4A and 4B are views showing an abutting surface 29a of a carriage plate 20, in which FIG. 4A is an enlarged plan view with parts omitted, and FIG.
Sectional view of.

FIG. 5 is a plan view of a carriage 30.

[Explanation of symbols]

10 print head 20 Carriage plate (fixed object) 29a contact surface 29c Sharp protrusion 31 screws

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41J 25/304 B41J 19/20 F16B 5/02 F16B 5/06

Claims (3)

(57) [Claims] 1. A structure for fixing a print head to an object to be fixed, wherein at least a part of one of the contact surfaces of the print head and the object to be fixed is transferred by transfer processing to the other. Abutment
A large number of sharp protrusions that cut into the surface are formed, and
The head fixing structure is characterized in that the other contact surface is not provided with a recess for accommodating the sharpened projection. 2. The structure according to claim 1, wherein the print head and the object to be fixed are tightened and fixed by screws, and the plurality of sharpened protrusions are formed at least in the peripheral portion of the screws. Head fixed structure. 3. The material of the print head in the fixing portion between the print head and the fixing target is synthetic resin, the material of the fixing target is aluminum, and the large number of sharp protrusions are formed on the fixing target side. The head fixing structure according to claim 1 or 2, wherein.