JPH07172028A - Image recording device - Google Patents

Abstract

PURPOSE:To provide an image recording device which has been miniaturized and the cost has been reduced by simplifying the constitution of the circumference of a recording head and facilitating the structure thereof by designing a holding method of a recording head. CONSTITUTION:In an image recording device provided with a main body base 1 which is comprised by forming integrally a recording paper holding part and a recording head 5 and platen roller 6 which are pressure-contacted with each other at a certain pressure through recording paper, the device is constituted of a plurality of members formed integrally with the main body base 1 which are comprised, for example, of a pressing member 11, positioning member 12 and bearing member 14 and a head holding device 10 holding the recording head 5 in a displaceable state in a fixed direction where the recording head 5 approaches to or separates from the platen roller 6 by these members is provided. The pressing member 11 can be taken as a holding claw member holding the recording head 5 by operating cooperatively with the positioning member 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus provided with a recording head and a platen roller, and more particularly to an apparatus suitable for a facsimile machine or the like which accommodates rolled recording paper inside.

[0002]

2. Description of the Related Art Conventionally, an image recording apparatus having a recording head and a platen roller has been widely used in a facsimile apparatus and the like, and recently, it has been used in a small facsimile apparatus integrated with a telephone, for example. This type of image recording apparatus includes a recording head (thermal head) in which a plurality of minute heating elements are arranged in a predetermined direction, and a platen roller facing the recording head. The main body base side of the recording head is wound in a roll shape. A concave recording paper holder portion is provided for holding the recording paper (thermosensitive recording paper). The recording head is swingably held by a fixed bracket so as to move toward and away from the platen roller, for example, via a holding movable bracket and a positioning member, and the fixed bracket is attached to the main body base or the recording paper holder. An elastic member such as a leaf spring or a coil spring for urging the recording head toward the platen roller is interposed between the fixed side member and the movable bracket, while being fixed to the upper cover. No. 1-131544, No. 63-15
4237 and Jitsukaihei 4-124663).

[0003]

However, in such a conventional image recording apparatus, a large number of parts are required to hold the recording head, and the number of assembling steps is increased, resulting in high cost. There was a problem of inviting. Further, this problem has been particularly noticeable in recent facsimile machines, which are required to be small in size and low in cost.

More specifically, the following problems are raised. (1) A plurality of independent parts are required to hold the recording head in the housing of the apparatus body. (2) It is necessary to form the movable and fixed brackets as a separate member from the main body base so that the recording head can be swung in the direction approaching and separating from the platen roller, and providing a sufficient gap between them.

(3) In order to allow the movable bracket to swing, it is necessary to give a play to the supporting portion by the fixed bracket. Especially, movement regulation in the width direction (management of the play amount in the axial direction of the platen roller). Must be done by a separate member. (4) To restrict the movement, the movable bracket may be provided with a positioning claw that engages with the support shaft of the platen roller, but since the positioning is released when the space between the recording head and the platen roller is released, the recording head is released. Is easily deviated from a predetermined range in the width direction (a predetermined range in the axial direction of the platen roller), and the protruding claws are easily damaged.

(5) Although it may be possible to directly attach the recording head to the printed circuit board, in this case, the load for swinging the recording head is large and it is difficult to obtain a good pressure contact force with the platen roller side. Is. (6) The connection cable becomes long in order to connect the print head and the printed circuit board arranged at the bottom of the apparatus body.

(7) Since the member for holding the recording head and the member for pressing (pressing) the recording head to the platen roller side are provided separately, it is necessary to arrange these separate members at substantially the same location. Therefore, the shape of each member becomes complicated. (8) Since the number of parts is large and the shape is complicated, the assembling work is poor and the assembling work is not easy.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an image recording apparatus which is simple in construction around the recording head and is easy to assemble to reduce the size and cost.

[0009]

In order to achieve the above object, the invention according to claim 1 is such that a main body base integrally formed with a recording paper holder portion for holding recording paper and a recording paper are opposed to each other. In the image recording apparatus including a recording head and a platen roller that are pressed against each other at a predetermined pressure, the recording head includes a plurality of members integrally formed with the main body base, and the plurality of members bring the recording head close to the platen roller. And a head holding means for holding the head so as to be displaceable in a predetermined direction so as to be separated from each other.
The invention described above is characterized in that the head holding means has a pressing member that causes a bending when the recording head faces the platen roller and presses the recording head toward the platen roller by the bending.

According to a third aspect of the present invention, the pressing member has a bending portion having a thin wall thickness in the predetermined direction in a part on the main body base side so as to reduce a cross-sectional area as compared with other parts. The invention according to claim 4 is characterized in that the pressing member has at least one hole opened at an end portion in the predetermined direction so that a part of the pressing member on the main body base side has a smaller cross-sectional area than other parts. The invention according to claim 5 is characterized in that the pressing member forms unevenness in a part of the main body base side in the predetermined direction. It is characterized in that it has a bending portion formed with.

According to a sixth aspect of the present invention, the recording head has a concave or convex positioning engaging portion, and the head holding means engages with the positioning engaging portion of the recording head. According to the invention of claim 7, the head holding means cooperates with the positioning member to position the recording head. A holding claw member that holds the recording head and bends in the predetermined direction to allow the recording head to be displaced in the predetermined direction, and the recording head has an engaging claw portion that is locked to the holding claw member on the back side. The invention according to claim 8 is characterized in that the pressing member is formed in a plate shape having the predetermined direction as a plate thickness direction.

Further, according to a ninth aspect of the present invention, a printed circuit board is provided which holds the recording head on the head holding means on the front side of the recording paper holder portion and forms a control circuit on the front side of the recording head. The recording head and the printed circuit board are electrically connected by a flexible connecting member which is integrally provided on either the recording head or the printed circuit board, and the invention according to claim 10 is characterized in that The head holding means has a support member that supports the recording head from below, and the invention according to claim 11 has a support member that supports the recording head from below. However, when the recording head supported by the support member rotates about the lower end thereof as a fulcrum toward the side separated from the platen roller, the holding claw member moves to the recording head. According to a twelfth aspect of the present invention, the holding claw member bends on the side separated from the platen roller, and the bending causes the recording head to platen. The invention is also characterized in that it also functions as a pressing member for pressing to the roller side. The invention according to claim 13 is characterized in that the positioning engaging portion of the recording head is located at the main body base from the pressure contact position between the recording head and the platen roller. It is characterized by being located on the side.

[0013]

According to the invention described in claim 1, the head holding means is composed of a plurality of members integrally formed with the main body base,
The recording head is held by the head holding means so as to be displaceable in a predetermined direction toward and away from the platen roller.
Therefore, it is not necessary to provide a dedicated part for holding the head.

According to the second aspect of the present invention, since the head holding means has the pressing member for pressing the recording head toward the platen roller side due to the bending, it is necessary to form the means for urging the recording head toward the platen roller side as a separate component. There is no. According to the invention described in claims 3 to 5, the pressing member has the bending portion whose cross-sectional area is smaller than the other portions in a part on the main body base side, so that the required bending for pressing can be easily obtained.

According to the sixth aspect of the present invention, the positioning member of the head holding means engages with the concave or convex positioning engaging portion of the recording head, so that the recording head moves in two directions orthogonal to the predetermined direction. Positioned. Therefore, it is not necessary to provide a separate component for positioning the recording head, and accurate positioning can always be performed in the axial direction of the platen roller.

According to a seventh aspect of the present invention, the holding claw member of the head holding means engages with the engaging claw portion on the rear surface side of the recording head, cooperates with the positioning member to hold the recording head, and the predetermined direction. The print head is bent to allow the recording head to be displaced. Therefore, the holding claw member does not project to the platen roller side (recording surface side) of the recording head, does not interfere with the recording paper conveyance system, and is less likely to be damaged.

In the invention according to claim 8, since the pressing member is formed in a plate shape having the predetermined direction as the plate thickness direction, it is difficult to deform with respect to an external force from other directions,
Positional deviation of the recording head is unlikely to occur. According to a ninth aspect of the invention, the recording head held by the head holding means on the front side of the recording paper holder portion and the printed circuit board provided on the front side of the recording head holder are provided on either the recording head or the printed circuit board. It is electrically connected by a flexible connecting member provided integrally. Therefore, it is not necessary to provide another connecting member between them.

According to the tenth aspect of the present invention, the recording head can be supported by the supporting member from below when the recording head is assembled, so that the recording head can be easily assembled. According to the eleventh aspect of the invention, when the recording head supported by the support member rotates about the lower end thereof as a fulcrum toward the side separated from the platen roller, the holding claw member engages with the engaging claw portion of the recording head. Therefore, the assembling of the recording head and the work for holding the recording head are greatly facilitated.

According to the twelfth aspect of the invention, since the holding claw member also serves as a pressing member that presses the recording head by bending, the structure around the recording head is further simplified. In the invention according to claim 13, the positioning engagement portion of the recording head is located closer to the main body base than the pressure contact position between the recording head and the platen roller. Therefore, the amount of unevenness of the positioning engaging portion from the back surface of the recording head can be reduced with respect to the swing amount of the recording head toward the platen roller, and the positioning engaging portion can be easily provided in the recording head. .

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 are views showing an embodiment of an image recording apparatus according to the invention described in claims 1 to 13. First,
The configuration will be described, but since the basic configuration of the entire apparatus is known, only the characteristic portion will be described in detail.

In FIGS. 1 and 2, reference numeral 1 denotes a main body base which constitutes a housing of the apparatus main body, and a recording paper holder portion 1a is integrally formed at a rear portion (right end portion in FIG. 2) of the main body base 1. There is. Reference numeral 2 denotes an upper cover that has an operation unit, a display unit, and the like and is mounted on the main body base 1. Reference numeral 3 denotes a recording paper wound in a roll shape and stored in the recording paper holder unit 1a.
Is a scanner unit for reading a document image. Further, 5 is a recording head for recording an image on the recording paper 3, 6 is a platen roller which faces the recording head 5 with the recording paper 3 interposed therebetween, and the recording paper 3 and the recording head 5 are of a thermal recording type, for example. is there. Although not shown in detail, the recording head 5 is composed of, for example, a heat dissipation base made of metal, a thermal head main body having a large number of minute heating elements, a wiring pattern or a flexible printed board on which electronic components are mounted. It is a well-known type and is pressed against the platen roller 6 with a predetermined pressure by a pressing force from a pressing member described later.
Reference numeral 7 denotes a plotter cover rotatably supported by the main body base 1 at its rotation fulcrum 7a. The plotter cover 7 rotates in the left-right direction in FIG. It can be opened and closed, and when it is closed, it can be retained by being locked by the upper cover 2. The platen roller 6 is rotatably supported by the plotter cover 7, and when the plotter cover 7 is closed, gears (not shown) at both ends in the axial direction are engaged with drive-side gears described later.

Reference numeral 10 denotes a head holding means composed of a plurality of members integrally formed with the main body base 1. The head holding means 10 is composed of a plurality of members 11 to 14 which will be described later.
Is held displaceably in a predetermined direction (left and right direction in FIG. 1: hereinafter also referred to as a pressure contact force direction) that approaches and separates from the platen roller 6. Specifically, as shown in FIG.
The head holding means 10 includes a plurality of pressing members 11a to 11g which are integrally formed with the main body base 1 from a resin material,
It has positioning members 12a and 12b and supporting members 14a to 14d, and holding claws 13 having inclined tip surfaces 131 are integrally formed on the pressing members 11a to 11g.

The pressing members 11a to 11g are provided at a predetermined interval in the longitudinal direction of the recording head 5, and when the recording head 5 is mounted at a predetermined position facing the platen roller 6, the pressing members 11a to 11g are changed from the natural state as shown in FIG. Even when the recording head 5 is mounted on the platen roller 6, the recording head 5 can be pressed toward the platen roller 6 side by the reaction force caused by the bending. Further, the pressing members 11a to 11g are formed in a plate shape having the pressing force direction as the plate thickness direction, and as shown in FIG. 4, a part of the main body base 1 side has a cross-sectional area smaller than other parts. As described above, the bending portion 111 has at least one hole portion 111a that is open at both ends in the pressure contact force direction (plate thickness direction). The pressing members 11a to 11g have a wall thickness (in this case, in the pressure contact force direction) so that a part of the main body base 1 side has a smaller cross-sectional area than other parts, as shown in FIG.
Corresponding to the plate thickness) having a thinned flexible portion 112,
Alternatively, as shown in FIG. 6, a bending portion 113 or the like may be formed by forming at least one bending portion 113a that forms unevenness in the pressure contact force direction on a part of the main body base 1 side. Also,
Of the pressing members 11a to 11g, a pair of pressing members 11a and 11g and pressing members 11b and 11b are provided for the central pressing member 11d.
f and the pressing members 11c and 11e are symmetrically arranged on the left and right in FIG. 3, and are wider toward the center side, and in the natural state before the recording head 5 is assembled, the upper end portions of these pressing members 11a to 11g. Are located on the same line.

The positioning members 12a and 12b are slidably fitted (engaged) to the convex positioning engaging portion 51 having a circular cross section provided on the back side (left side in FIG. 1) of the recording head 5. )
The recording head 5 is positioned in two directions (the paper width direction and the conveying direction of the recording paper 3) orthogonal to the pressure contact force direction through the pair of positioning engagement portions 51. Further, the fitting holes 121 of the positioning members 12a and 12b are
The positioning engagement portion 51 of the recording head 5 is provided at a height such that it is located closer to the main body base 1 than the position where the recording head 5 and the platen roller 6 are pressed against each other. These positioning members
12a and 12b cooperate with pressing members 11a to 11g having holding claws 13 to hold the recording head 5, and the pressing members 11a to 11g hold the holding claws 13 on the rear side of the recording head 5. In the state of being engaged with the engaging claw portion 52 provided on the recording head 5, the recording head 5 is bent in the direction of the pressure contact force to allow the displacement of the recording head 5 in the same direction. That is, the plurality of pressing members 11
a to 11g also function as a plurality of holding claw members. In addition,
The engaging claw portion 52 of the recording head 5 is formed, for example, by partially bending the heat dissipation base of the recording head 5.

The support members 14a to 14d are substantially U-shaped with the upper end being an open end, and are members that can support the recording head 5 from below when assembled so that the lower end of the recording head 5 has a predetermined height. When the recording head 5 supported by the support members 14a to 14d is rotated about the lower end thereof as a fulcrum to the side separated from the platen roller 6, the pressing members 11a to 11g as the holding claw members are engaged with the recording head 5. It is adapted to engage with the claw portion 52.

On the other hand, the recording head 5 is held by the head holding means 10 on the front side of the recording paper holder portion 1a of the main body base 1, and on the front side of the recording head 5, a print forming a control circuit of this apparatus. A substrate 21 is provided.
The printed board 21 is electrically connected to the recording head 5 by a flexible connecting member 53 so as to supply power and drive signals to the recording head 5. The connecting member 53 includes a flexible substrate 53a and a connector 53b connected to the flexible substrate 53a. The flexible substrate 53a is integrally formed on the flexible printed circuit board in the recording head 5 or is directly connected thereto.

The positioning engaging portion 51 may be concave, and in that case, the positioning members 12a and 12b are provided with protrusions corresponding thereto. In addition, the flexible connecting member 53
Instead of this, a flexible connecting member may be integrally provided on the printed circuit board 21 side. In FIG. 2, 22 is a printed circuit board.
A printed circuit board that forms a control circuit together with 21, 31 is an idle gear that meshes with the gear provided at the end of the platen roller 6, 32 is a motor that drives the platen roller 6, 33
Is a reduction gear provided between the output part of the motor 33 and the idle gear 31, and these together with the platen roller 6 constitute a recording paper conveying system 30. Further, the upper cover 2 is provided with stoppers 61 and 62 for restricting the swinging range of the pressing members 11a to 11g in the pressure contact force direction within a predetermined range.

Next, the operation will be described. When the recording head 5 is held by the head holding means 10, first, the lower end of the recording head 5 is supported by the support members 14a to 14d before opening the plotter cover 7 or attaching the plotter cover 7 to the main body base 1. 1. The recording head 5 is roughly positioned in the vertical direction by supporting the recording head 5 and the pressing members 11a to 11g are slightly bent to the left in FIG. 1, and the positioning engaging portion 51 of the recording head 5 is fitted to the positioning members 12a and 12b. The recording head 5 is positioned in the width direction (paper width direction) by slightly fitting it into the dowel hole 121. Next, the recording head 5 is further pressed by pressing members 11a ...
Rotate so as to press it toward the 11g side. At this time, the inclined front end surface 131 of the holding claw 13 is engaged with the engaging claw 52 of the recording head 5.
The pressing members 11a to 11g (or further the engaging claws 52) are bent so as to ride on, and the engaging claws 52 of the recording head 5 and the holding claws 13 of the pressing members 11a to 11g are engaged. In addition, the positioning engaging portion 51 of the recording head 5 has the positioning member 12a,
Fully fit in the fitting hole 121 of 12b. As a result, the pressing members 11a to 11g and the positioning members 12a and 12b cooperate with each other to hold the recording head 5 displaceably in the pressure contact force direction. That is, the recording head 5 is the head holding means.
Held at 10. During the assembling work of the recording head 5 as described above, a jig corresponding to the stoppers 61 and 62 of the upper cover 2 can be used, or the upper cover 2 can be attached to the main body base 1. . Further, in the holding state at this time, since the plotter cover 7 is opened, the pressing members 11a to 11g elastically return to the platen roller 6 side within the predetermined range.

Next, the recording paper holder portion 1 of the main body base 1
After the recording paper 3 is loaded in a and the tip of the recording paper 3 is positioned on the recording surface of the recording head 5, the plotter cover 7 is closed. At this time, the platen roller 6 approaches the recording head 5 side and the pressing members 11a to 11g bend, and the plotter cover 7
When the platen roller 6 moves to the position shown in FIG. 1 where it is locked to the upper cover 2 side, a predetermined pressure contact force for sandwiching the recording paper 3 acts between the recording head 5 and the platen roller 6. Then, in this state, the recording paper 3 by the recording head 5 is
It becomes possible to record an image on the. Although the back surface of the recording head 5 and the positioning members 12a and 12b are shown in contact with each other in FIG. 1, there is a predetermined minute gap between the two and the positioning members 12a and 12b. Therefore, no pressing force acts on the recording head 5. Needless to say, this is not the case when the positioning members 12a and 12b are also used as pressing members.

As described above, in the image recording apparatus of the present embodiment, a plurality of members integrally formed with the main body base 1, that is, pressing members 11a to 11g also serving as holding claw members, positioning members 12a and 12b, A head holding means 10 is constituted by the support members 14a to 14d, and the head holding means 10 holds the recording head 5 so that the recording head 5 can be displaced in a direction of approaching and separating from the platen roller 6. Therefore, it is not necessary to provide many holding-dedicated parts separate from the main body base 1 for holding the head as in the conventional case. Further, since the head holding means 10 has the pressing members 11a to 11g that bend when the recording head 5 is mounted and press the recording head 5 toward the platen roller 6 side, a means for urging the recording head 5 toward the platen roller 6 side is provided. Since it is not necessary to form a separate component from the main body base 1 and the pressing members 11a to 11g as holding claw members also serve as members for pressing the recording head 5 by flexure, the configuration around the recording head 5 is even simpler. Be converted. Further, the recording head 5 held by the head holding means 10 on the front side of the recording paper holder portion 1a and the printed circuit board 21 provided on the front side of the recording head holder part 1a are connected to each other by a flexible connection. Since they are electrically connected by the member 53, it is not necessary to provide another connecting member between them, and in this respect as well, the configuration around the recording head 5 is further simplified.

Further, the pressing members 11a to 11g are the main body base 1
Bending part 111 with a smaller cross-sectional area than other parts on one side
Since (or the flexible portion 112 or the flexible portion 113) is provided, it is possible to easily obtain the required flexure for performing appropriate pressing, regardless of the simple overall shape of the pressing members 11a to 11g. It is possible to easily give the members 11a to 11g a function as a holding claw member. In addition, the recording head 5
The positioning members 12a, 12b on the pair of positioning engaging portions 51 of
By engaging with, the recording head 5 is positioned in two directions orthogonal to the pressure contact force direction, so there is no need to provide a separate component for positioning the recording head 5, and
Accurate positioning is always possible in the axial direction of the platen roller 6. Moreover, since the pressing members 11a to 11g are formed in a plate shape having the pressing force direction as the plate thickness direction, they are unlikely to be deformed by external force from other directions. Therefore, by combining these actions, the recording head 5 can be swung in the direction of pressure contact force with a simple configuration without displacement. Further, since the positioning engagement portion 51 of the recording head 5 is located closer to the main body base 1 side than the pressure contact position between the recording head 5 and the platen roller 6, the positioning engagement portion 51 is positioned with respect to the swing amount of the recording head 5 toward the platen roller 6 side. The amount of unevenness of the engaging portion 51 from the back surface of the recording head 5 can be reduced, and the positioning engaging portion 51 can be easily formed, for example, by providing a protrusion on the heat dissipation base (the above-mentioned metal one). You can

Further, in this embodiment, the pressing members 11a to 11g as the holding claw members are the engaging claw portions on the back side of the recording head 5.
Since the recording head 5 is held by engaging with 52 and cooperating with the positioning members 12a and 12b, and is bent in the direction of the pressure contact force to permit the displacement of the recording head 5, the pressing members 11a to 11a serving as holding claw members. 11 g is the platen roller 6 of the recording head 5.
It does not project to the side, does not interfere with the recording paper transport system 30, and is less likely to be damaged.

In addition to these, in this embodiment, the recording head 5 is supported from below by the supporting members 14a to 14d of the head holding means 10, so that the general positioning of the recording head 5 at the time of assembling can be simplified and the assembling thereof can be performed. Will be easier. Moreover, when the recording head 5 supported by the supporting members 14a to 14d rotates about the lower end of the recording head 5 toward the side separated from the platen roller 6, the pressing members 11a to 11 serving as holding claw members.
Since g engages with the engaging claw portion 52 of the recording head 5, the recording head 5 can be easily assembled only by rotating in that direction, and the recording head 5 is held on the main body base 1. The work will be greatly facilitated.

As described above, in this embodiment, since the head holding means 10 formed integrally with the main body base 1 is provided, the structure around the recording head 5 is greatly simplified and the recording head 5 can be easily assembled. Furthermore, it is possible to further reduce the number of parts and facilitate the assembling work because it is not necessary to assemble the parts for holding the head. As a result, it is possible to provide an image recording apparatus that is downsized and costs are reduced.

[0035]

According to the first aspect of the present invention, the head holding means is composed of a plurality of members integrally formed with the main body base, and the head holding means moves the recording head close to or away from the platen roller. Since the head is held so that it can be displaced in any direction, it is not necessary to provide a component dedicated to holding the head, and the configuration around the recording head can be greatly simplified. As a result, it is possible to reduce the size and cost of the image recording apparatus.

According to the second aspect of the present invention, the pressing member integrated with the main body base causes bending when the recording head faces the platen roller and presses the recording head toward the platen roller. Therefore, it is not necessary to provide a separate component for urging the recording head toward the platen roller, and the configuration around the recording head can be further simplified.

According to the third aspect of the present invention, the pressing member has a bending portion having a thin wall thickness in a predetermined direction in a part on the main body base side so as to reduce the cross-sectional area as compared with other parts. Regardless of the overall shape, the required bending for pressing can be easily obtained, and the pressing member can have the function of another member to achieve further simplification. According to the invention described in claim 4, the pressing member has a bending portion in which at least one hole opening at an end in a predetermined direction is formed in a part on the main body base side so as to reduce the cross-sectional area as compared with other parts. Therefore, regardless of the overall shape of the pressing member, the required bending for pressing can be easily obtained, and the pressing member can have the function of another member to achieve further simplification.

According to the fifth aspect of the invention, since the pressing member has the bending portion in which at least one bent portion which forms the unevenness in the predetermined direction is formed in a part of the main body base side, the entire shape of the pressing member can be obtained. Regardless, the required bending for pressing can be easily obtained, and the pressing member can have the function of another member to achieve further simplification. According to the invention of claim 6, the positioning member of the head holding means is engaged with the concave or convex positioning engaging portion of the recording head to position the recording head in two directions orthogonal to the predetermined direction. Therefore, it is not necessary to provide a separate component for positioning the recording head, and the recording head can always be positioned accurately in the axial direction of the platen roller.

According to the seventh aspect of the present invention, the holding claw member integrated with the main body base is engaged with the engaging claw portion on the back side of the recording head and cooperates with the positioning member to hold the recording head. Since the recording head is bent in a predetermined direction to allow the displacement of the recording head, the holding claw member does not project to the platen roller side of the recording head, and the holding claw member interferes with or damages the recording paper conveyance system. Can be prevented.

According to the invention described in claim 8, since the pressing member is formed in a plate shape having a predetermined direction as a plate thickness direction,
Deformation due to external force from other directions can be made less likely to occur, and positional deviation of the recording head can be made less likely to occur. According to the invention described in claim 9, the recording head held by the head holding means on the front side of the recording paper holder portion, and the printed board provided on the front side of the recording head are either the recording head or the printed board. Since they are electrically connected by the flexible connecting member integrally provided in the crab, it is not necessary to provide another connecting member between the two, and the configuration around the recording head can be further simplified.

According to the tenth aspect of the invention, since the recording head is supported from below by the support member of the head holding means, the general positioning at the time of assembling the recording head is unnecessary and the assembly can be facilitated. . Claim 1
According to the first aspect of the invention, when the recording head is rotated about the lower end supported by the supporting member as a fulcrum toward the side separated from the platen roller, the holding claw member is engaged with the engaging claw portion of the recording head. As a result, the assembling of the recording head and the work for holding it can be greatly facilitated.

According to the twelfth aspect of the invention, the holding claw member for holding the recording head and the pressing member for pressing the recording head to the platen roller side by bending can be a single member, and the periphery of the recording head can be formed. The configuration of can be further simplified. According to the thirteenth aspect of the invention, since the positioning engagement portion of the recording head is located closer to the main body base than the press contact position between the recording head and the platen roller, the amount of swing of the recording head toward the platen roller side is large. Thus, the amount of unevenness of the positioning engaging portion from the back surface of the recording head can be reduced, and the positioning engaging portion can be easily provided on the recording head.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing an embodiment of an image recording apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of an image recording apparatus of one embodiment seen through from a side surface.

FIG. 3 is a view of the configuration around the recording head as seen from the back side of the recording head.

FIG. 4 is a diagram showing a mode in which a hole is provided in a bending portion of the pressing member.

FIG. 5 is a view showing a mode in which the bending portion of the pressing member is thin.

FIG. 6 is a diagram showing a mode in which a bending portion is provided in a bending portion of the pressing member.

[Explanation of symbols]

1 main body base 1a recording paper holder 2 upper cover 3 recording paper 5 recording head 6 platen roller 7 plotter cover 10 head holding means 11, 11a to 11g pressing member (plural members, holding claw members) 12, 12a, 12b positioning member (Plural members) 13 Holding claws (holding claw members) 14, 14a to 14d Supporting members (plural members) 21 Printed circuit board 30 Recording paper conveyance system 51 Positioning engagement part 52 Engagement claw part 53 Flexible Connection member 53a Flexible board 53b Connector 111, 112, 113 Flexible part 111a Hole part 113a Bent part 121 Fitting hole

Claims (13)

[Claims] 1. An image recording comprising: a main body base integrally formed with a recording paper holder portion for holding a recording paper; and a recording head and a platen roller which face each other with the recording paper in contact with each other at a predetermined pressure. In the apparatus, a head holding unit is provided which is composed of a plurality of members integrally formed with the main body base, and which holds the recording head so as to be displaceable in a predetermined direction to approach and separate from the platen roller. An image recording device characterized by. 2. The head holding means has a pressing member which causes a bending when the recording head faces the platen roller and presses the recording head toward the platen roller by the bending. Image recording device. 3. The pressing member according to claim 2, wherein the pressing member has a bending portion having a wall thickness reduced in the predetermined direction so as to reduce a cross-sectional area in a part of the main body base side as compared with other parts. Image recording device. 4. The pressing member has a bending portion in which at least one hole opening at an end portion in the predetermined direction is formed in a part of the main body base side so as to reduce a cross-sectional area as compared with other parts. The image recording apparatus according to claim 2, which is characterized in that. 5. The image recording apparatus according to claim 2, wherein the pressing member has a bending portion in which at least one bending portion that forms unevenness in the predetermined direction is formed in a part of the main body base side. 6. The recording head has a concave or convex positioning engaging portion, and the head holding means engages with the positioning engaging portion of the recording head so that the head is orthogonal to the predetermined direction. The image recording apparatus according to claim 1, further comprising a positioning member that positions in two directions. 7. The head holding means has a holding claw member which cooperates with the positioning member to hold the recording head and which is bent in the predetermined direction to permit displacement of the recording head in the direction. 7. The image recording apparatus according to claim 6, wherein the recording head has an engaging claw portion that is locked to the holding claw member on the back side. 8. The image recording apparatus according to claim 2, wherein the pressing member is formed in a plate shape having the predetermined direction as a plate thickness direction. 9. A print board for holding the recording head on the head holding means on the front side of a recording paper holder portion and forming a control circuit on the front side of the recording head, the recording head or the printed board. The image recording apparatus according to claim 1, wherein the recording head and the printed circuit board are electrically connected by a flexible connecting member integrally provided in the crab. 10. The image recording apparatus according to claim 1, wherein the head holding means has a support member for supporting the recording head from below. 11. The head holding means has a supporting member for supporting the recording head from below, and when the recording head supported by the supporting member rotates about its lower end as a fulcrum to the side separated from the platen roller. The image recording apparatus according to claim 7, wherein the holding claw member engages with an engaging claw portion of the recording head. 12. The holding claw member also serves as a pressing member for causing a bending on a side separated from the platen roller and pressing the recording head toward the platen roller by the bending. Image recording device. 13. The image recording apparatus according to claim 6, wherein the positioning engagement portion of the recording head is located closer to the main body base than the pressure contact position between the recording head and the platen roller.