JPS6013563A - Recording apparatus - Google Patents

Abstract

PURPOSE:To perform high quality recording by securing the positional accuracy of the recording means of a recording head, by adjusting the attachment position of a recording head which is moved along the running direction of recording paper and contacted with a columnar platen under pressure through the recording paper. CONSTITUTION:A heat generating head 6' is moved to the running direction of recording paper through the slot 6'd thereof with respect to a holding plate 10, which has a connection part 10b equipped with a notch part 10c engaged with the bearing of a columnar platen for feeding the recording paper, and subjected to positional adjustment. By this mechanism, the positional accuracy of the heat generating line 9' of the recording means of a head 6 is secured and high quality recording can be performed in low power consumption, low noise and low heat generation without increasing the torque of a power source.

Description

TECHNICAL FIELD The present invention relates to a recording apparatus, and more particularly to a recording apparatus that performs recording by pressing a recording head having a linear recording means and a cylindrical platen through a recording paper.

2. Description of the Related Art This type of recording device includes, for example, a thermal type recording device used in a recording section of a facsimile machine, which has recently been widely used.

The main structure of this type of recording apparatus is shown in FIG. 1 and will be described below. In the figure, the reference numeral 1 indicates a storage section provided within the apparatus, and a roll paper 3 in which a recording paper 2 is wound is stored in the storage section 1. The recording paper 2 unwound from the roll paper 3 is guided by a guide roller 4 and guided between a platen 5 and a recording head 6.

The platen 5 is formed in a cylindrical shape, and is rotated in the direction of the arrow by a driving means (not shown) to feed the recording paper 2 in the direction of the arrow B and discharge it out of the apparatus.

On the other hand, the recording head 6 is formed in the shape of an elongated thick plate, and is attached to a cover 7 that can be opened and closed for exchanging the roll paper 3. When the cover 7 is closed, the recording head 6 is attached to a cover 7 that can be opened and closed to replace the roll paper 3. 5. A recording line 9, which is a linear recording means, is provided on the surface of the recording head 6 on the platen 5 side.

During recording, the recording paper is fed in the direction of arrow B by the rotation of the platen 5 in the direction of the arrow, and the recording line 9 is pressed against the recording paper 2 on the platen 5 by the biasing force of the spring 8.
is driven and recording is performed.

As described above, in this type of recording apparatus, recording is performed by pressing the linear recording line 9 against the cylindrical plaque 75. Therefore, in order to press the entire recording line 9 uniformly against the recording paper 2 and perform proper recording, the position of the recording line 9 must be accurately aligned with the recording position of the print sheet 5, that is, the generatrix passing through the contact point with the recording head 6. It is necessary to match. Therefore, the holding structure for the recording head 6 needs to have high positional accuracy.

Next, the holding structure of the recording head of the conventional device is shown in FIG.
explain. Here, an example is shown in which thermal paper is used as the recording paper and a heat generating head is used as the recording head.

In the same figure, the symbol 6' is a heat generating head.
An elongated thick plate-shaped metal base 51a, a ceramic substrate 6b fixed on the metal base, and a ceramic substrate 6/
b and a heat generating line 9' provided on the top. Positioning holes 61C, 6Jc are formed in the metal base 5'a.

Also, what is designated by the reference numeral 10 is a screw hole 10a at the tip of the interrupted surface that holds the recording head 6'.

10a is formed. Screws 11.11 are inserted into the recording head 6' through this screw hole 10a and the positioning hole 67C.
is fixed to the tip of the holding plate. Further, an engaging portion 10b is protruded from the tip of the holding plate 10 on the side bent downward in the figure, and a semicircular notch 10C is formed approximately in the center of the engaging portion 10b. There is. This notch 10
The diameter of C is approximately equal to the diameter of the bearing 12 that pivotally supports the shaft 5a of the platen that faces it.

In the above configuration, the positioning hole 61C and the screw hole 1
The inner diameter of 0a is approximately equal to the outer diameter of the screw 11, and is thicker by the minimum clearance required for fixing.

Also, the distance t between the heating line 9' and the center of the positioning hole 6C
The distance m between the center of the notch 10G and the center of the screw hole 10a is set to be equal. As a result, the heat generation life is 9'
is arranged on an extension of the normal line passing through the center of the semicircle of the notch portion 10C.

With the above structure, the holding plate 10 moves in the direction of arrow C and the notch 10C engages with the bearing 12, so that the heat generating line 9'C comes into pressure contact with the platen 5.

At this time, since the position of the notch portion 10C coincides with the position of the bearing 12, the positional accuracy of the holding plate 10 with respect to the platen 5 is ensured. Therefore, whether or not the heating line 9' coincides with the generatrix passing through the contact point of the platen 5 with the ceramic substrate 5/b depends on whether or not the above-mentioned distances 1- and m coincide.

However, according to the above configuration, the heat generating head 6' is fixed by the screw 11 through the positioning hole 6'C and the screw hole 10a, which have only a minimum clearance, and the distance t cannot be adjusted. Whether or not they match as described above depends on the error of distance/-rm.

Here, if the error in the distance t is 61 and the error in the distance m is δ2, the error δ occurs in the process of joining the metal base 6'a and the ceramic substrate 6'b. This bonding process is usually performed by human visual inspection, so the
An error δ of 1n1n appears. This error δ.

If you try to make it smaller, the yield of the product will be poor and the cost will be high. Further, the error δ2 is related to the processing accuracy of the holding plate 10, but normally occurs on the order of 01 to 0.2M.

Therefore, the total error (δ1 + δ2) is maximum 0.6 mm.
Although a certain degree of error occurs, this degree of error can be absorbed if the platen is made of sponge or the like and has a large nip width, and the recording quality can be guaranteed.

However, recently, platens made of solid rubber that do not have a large nip width are increasingly being used. This is because when the platen is used also as a roller for conveying recording paper in order to downsize and lower the cost of the apparatus, it is necessary to have a solid platen in order to guarantee the accuracy of conveying the recording paper.

In the case of such a platen with a small nip width, the recording quality deteriorates because the above-mentioned error (δ, +δ2) cannot be absorbed. In order to improve this point, there is a method of increasing the synip width by increasing the pressing force of the recording head against the platen. However, according to this method, the load on the drive motor of the free ten is large and its torque must be increased, resulting in problems such as increased power consumption, heat generation, increased noise, and increased cost of the motor.

Purpose The present invention has been made in view of the above-mentioned circumstances, and provides a recording device of the type described above, which guarantees the positional accuracy of the recording means of the recording head with a configuration that can be easily and inexpensively produced.
It is an object of the present invention to provide a recording device that can perform high quality recording while reducing power consumption, noise, and heat generation.

Example DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the present invention will be described below based on the drawings.

In this embodiment, a heat generating head similar to that shown in FIG. 2 is used as a recording head.

In each figure, the same or similar parts as in FIG. 2 are designated by the same or similar symbols.

FIG. 3 shows the structure of the heat generating head and holding plate of this embodiment.

As shown in the figure, in this embodiment, the retainer plate is constructed in exactly the same way as the conventional one, with a notch 10 at the tip.
A retaining portion 10b having a C and a screw hole 10a.

10a is formed. The heat generating head 6' also consists of a metal base 6'a, a ceramic substrate 6'b, and a heat-sensitive line 9' as in the conventional case, but in this embodiment, the metal base 6'a has conventional positioning holes. In place of the holes 5'c, elongated holes 6'd are formed at each of the four corners.

The inner diameter of the elongated hole 6'd in the direction perpendicular to the heat generating line 9' is significantly larger than the outer diameter of the fixing screw 11, and the inner diameter in the direction parallel to the heat generating line 9' is also larger than the outer diameter of the screw 11. The diameter and width are also slightly larger.

In this embodiment, the heating head 6' is fixed to the holding plate 10 with screws 11 through the elongated hole 6'd and the screw hole 10a. Therefore, the fixing position of the heat generating head 6' can be adjusted in a direction almost perpendicular to the heat generating line 9' while temporarily fixed with the screws 11, and the fixing position accuracy of the heat generating head 6' with respect to the holding plate 10 can be extremely high. can.

Next, an example of a method for positioning and fixing the heat generating head with respect to the holding plate with the above structure will be described with reference to FIG. 4.

In the same figure, the reference numeral 13 is a U-shaped jig for positioning and fixing. Place it in the specified position.

Next, the positioning pins 14° 14 are inserted into the jig 13 formed at predetermined positions on the inner surfaces of the jig 13, 13a, 13a while being engaged with the cutout portions 10C of the holding plate 10. Here, since the outer diameter of the pin 14 is approximately equal to the inner diameter of the notch 10C, the position of the holding plate 10.10 is determined by this.

Furthermore, by inserting the clamp member 15.15 into a hole (not shown) formed on the inside surface of the jig 13, the holding plate 10
．． Fix 10.

Next, the heat generating head 6' is positioned relative to the holding plate 10.degree. 10 using a positioning device 16 and a linear feeder 20.

The positioner 16 includes a transparent plate 18 made of glass or the like on which a straight marked line 17 is drawn, and magnifying magnifying means 19 and 19 provided on the transparent plate 18 at both ends of the marked line 17.
It consists of Further, the positioner 16 passes through the centers of the opposing positioning pins 14 and 14 and the positioning pin 1
The jig 13 is placed above the jig 13 so that the marked line 17 exactly coincides with a plane perpendicular to the jig 13.

When positioning, the tip of the linear feeder 20 is attached to a metal purse 6'.
The marked line 1 is placed on one side' or the opposite side of one end of a and is magnified as shown in FIG. 5 through a magnifying glass 19.
Linear feeder 2 while visually checking the misalignment between 7 and heating line 9'.
0, the metal base 6'a is moved in the direction of the arrow along the running direction of the pick recording paper, so that the marked line 17 and the heat generating line 9' are aligned. Repeat this process on the other end as well.

By aligning the marked line 17 with the heat generating line 9' by the above operation, the marked line 17 becomes a straight line connecting the centers of the positioning pins 14.
C, coincides with the line connecting the centers of IOC I~, holding plate 10, 1
Positioned precisely relative to 0.

After that, tighten the screw 11 and attach the heating head to the holding plate i.
Fixed to o, io.

As described above, according to the configuration of this embodiment, the simple jig 13
The heat-generating head can be positioned very accurately on the holding plate 10.degree. 10 and fixed by a simple operation by moving around the entire circumference of the positioning device 16 and the positioning device 20. However, the configuration of the positioning method is of course limited to the above example, and 1l-1:fX
,stomach.

In the above embodiment, a long hole 6'a was formed in the metal base 6'a and a screw hole was formed in the holding plate 10, but this was reversed to form a screw hole in the metal base 6'a and a long hole in the holding plate 10. Even if holes are formed, the same effect as above can be obtained.

In addition, in the embodiment, an example was shown in which the positional accuracy of the retainer plate 10 is guaranteed by the notch 10C of the retainer plate 10 engaging with the bearing 12 of the platen 5, but the retainer plate 10 may be replaced by parts or members other than the bearings. Of course, the present invention can also be applied to those in which positional accuracy is guaranteed. Furthermore, the present invention can also be applied to a configuration in which the arrangement relationship between the platen and the recording head is reversed from that of the embodiment.

Effects As is clear from the above explanation, according to the present invention, in the recording apparatus of the type described in 42, the recording head is attached to the retaining plate, which is the retaining member, at the same position, so that it can be easily mounted. By using suitable adjustment jigs and operations, the position of the recording head, that is, the recording line, relative to the platen can be aligned with very high precision, ensuring high quality recording. 1.Productivity is improved because the tolerance for errors in parts is increased,
Can reduce costs. Furthermore, the torque of the platen drive motor can be reduced, reducing cost and power consumption.
It is possible to reduce noise and heat generation.

[Brief explanation of the drawing]

FIG. 1 is a vertical t5-side view schematically showing the configuration of the main parts of the recording apparatus, FIG. 2 is a partial sectional view showing the sampling structure of a conventional recording head, and FIG. 3 and the following are detailed explanations of the present invention. Figure 3 is an exploded perspective view to explain the structure of installing the heat generating nozzle, Figure 4 is a perspective view to explain the positioning and fixing method of the heat generating head, and Figure 5 is a view taken using the magnifying glass in Figure 4. It is a top view explaining visual observation. 6'... Heat generating head 6'a... Metal base 6'b
...Ceramic board 6'd, ...Long hole 9'...Heating line 10...Holding plate 10a...Screw hole 10
b...Engaging part 10C/notch part

Claims (1)

[Claims] In a recording apparatus that performs recording by press-contacting a recording head having a linear recording means and a cylindrical platen through recording paper, ``recording on a member that holds the recording head a-''
1. A recording device characterized in that the mounting position of the Rad is adjusted by moving it along the direction in which the recording paper runs.