JPH07214867A - Recorder - Google Patents

Abstract

PURPOSE:To provide a recorder which can improve relative positioning accuracy between a recording head and a platen automatically. CONSTITUTION:An opening/closing member 4 is jointed to a supporting frame 1 so as to open and close, and a platen 7 is rotatably-supported on the opening/ closing member 4. A recording head 10 which can be connected and disconnected is supported on the platen 7, and a head supporting plate 9 which is fitted onto a supporting shaft 8 fixed onto the supporting frame 1, taking some clearance and engaged so as to oscillate is mounted. A regulating plate 9a which is brought into the shaft 7a of the platen 7 or a bearing 6 provided at the opening/closing member 4 where the shaft 7a is supported so as to rotate is mounted integratedly with the head supporting plate 9. A forcing spring 13 is provided, which forces the regulating plate 9a toward the shaft 7a or the bearing 6 when the opening/closing member 4 is at a closing position. A pressure means 15 is provided, which presses the head supporting plate 9 so that the recording head 10 may be brought into elastic contact with the platen 7 when the opening/closing member 4 is at a closing position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus for printing on thermal paper, for example, using a thermal head, and more particularly to a supporting apparatus capable of increasing the relative positional accuracy between the recording head and the platen. Is.

[0002]

2. Description of the Related Art As a first conventional technique, a head substrate having heat-generating dots (recording heads) is provided on a base substrate, and while the terminal portion of the head substrate is pressed and fixed by a holding cover, the base substrate At both ends, there is a thermal print head in which a positioning piece having an engaging groove for guiding and engaging the shaft of the platen is bent and integrally formed (Japanese Patent Publication No. 5-7187).

As a second conventional technique, a recording head is provided inside a case, and a platen and a roll holder for storing rolls of recording paper are provided on the front cover side which can be opened and closed on the front side of the case. There is a recording device.

[0004]

As in the first prior art, the heating dot (recording head) and the engaging groove for engaging the shaft of the platen are provided on the same member (base substrate). Can accurately position and hold the platen with respect to the heating dots without being affected by the platen mounting accuracy and surface roundness, but with such a configuration, the recording head is not in contact with the platen. The platen cannot be provided on the side of an opening / closing member such as a front cover that is configured to be separated from each other, that is, can be opened and closed. Therefore, the operation of exchanging the recording paper roll and the like is extremely complicated, and the loading operation of the recording paper is very troublesome.

With the configuration in which the roll holder and the platen are provided on the front cover side as in the second prior art, the recording paper loading operation is easy, but after the front cover is closed, the recording head and platen are removed. It is necessary to improve the relative position accuracy of. In order to improve the relative positional accuracy between the print head and the platen, it is necessary to manage the individual part accuracy and assembly accuracy of the many parts required to support them with high accuracy. It was

A first object of the present invention is to provide a recording apparatus capable of increasing the relative positional accuracy between the recording head and the platen with a simple structure in a structure in which a platen is provided on the opening / closing member.

A second object of the present invention is to achieve the above-mentioned first object and to uniformly press the recording head over the entire length of the platen.

A third object of the present invention is to provide a recording apparatus which can achieve the above-mentioned first object and which can easily and easily carry out a recording paper loading operation.

[0009]

The first aspect of the recording apparatus of the present invention.
The opening and closing member is openably and closably connected to the support frame, the platen is rotatably supported by the opening and closing member, and the recording head that is brought into contact with and separated from the platen is supported by the front end and the rear end is A head support plate is provided that is fitted into a support shaft fixed to the support frame with a gap and is swingably engaged. When the opening / closing member is in the closed position, the platen shaft or the shaft concerned. The control plate, which is capable of contacting the bearing provided on the opening / closing member to rotatably support the head, is provided integrally with the head support plate, and when the opening / closing member is in the closed position, the restriction plate is attached to the shaft or the bearing. An urging spring is provided to urge the head supporting plate to press the head supporting plate so that the recording head elastically contacts the platen when the opening / closing member is in the closed position.

A second feature of the recording apparatus of the present invention is that the pressing means presses the upper surface of the head support plate at a symmetrical position with respect to a line dividing the platen into two parts orthogonal to the axial direction of the platen. This is the head pressure plate.

A third feature of the recording apparatus of the present invention is that a holder for a recording paper roll is provided in the opening / closing member.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall construction will be described with reference to FIGS.
The support frame 1 formed of a metal plate is bent in a U shape, and a right side plate 1a, a left side plate 1b, and a bottom plate 1c are integrally formed. In order to keep the right side plate 1a and the left side plate 1b in parallel with each other at a predetermined interval, the fixed plate 2 has both side plates 1a and 1b.
It is fixed to the upper rear part of the. A shaft 3 having a circular cross section is provided in the lower corner of the front end of the support frame 1 so as to cross left and right.

An opening / closing member 4 which covers the front surface of the support frame 1 and whose side surface is substantially L-shaped is rotatably supported on the shaft 3. A spring 30 (see FIG. 3) is retained between the support frame 1 and the opening / closing member 4 via the shaft 3, and the opening / closing member 4 is biased in the opening direction by the spring force of the spring 30. Has been done.

On the inner surface of the opening / closing member 4, a recording paper holder 5 for storing and holding the recording paper P wound in a roll shape (see FIG. 5).
(See) is provided. A locking piece 4c formed at the rear end of the opening / closing member 4 is locked to the lower surface of the rear end of the recording paper holder 5, and the recording paper holder 5 is fixedly held by the opening / closing member 4. . At the upper end of the opening / closing member 4, there is a pair of bearings 6,6.
Are fixed, and the platen shaft 7a is rotatably supported by the pair of bearings 6 and 6. This platen shaft 7
A cylindrical platen 7 made of silicone rubber is provided at a. In the vicinity of the bearings 6 and 6, restricting portions 4a and 4a, which will be described later, are formed on the opening / closing member 4 by bending. As a means for holding the open / close member 4 in the closed state, as shown in FIGS. 5 and 6, an engagement protrusion 18 is formed on the rear end side of the recording paper holder 5, and is engaged on the bottom plate 1c side. A push latch 19 that engages with and catches the protrusion 18 is provided so as to be inclined forward.

A support shaft 8 having a circular cross section is fixedly provided across substantially the upper center of both side plates 1a and 1b of the support frame 1 (see FIG. 2). A head support plate 9 is attached to the support shaft 8.
Are engaged in the following structure. As shown in FIG. 6, the tongues 9d and 9e are bent on both sides of the support portion 9c at the rear end of the head support plate 9, and the U-shape is formed by the tongues 9d and 9e. The hole 9f is engaged with the lower portion of the support shaft 8 with a predetermined gap d. Therefore, the support portion 9c of the head support plate 9 is engaged with the fixed support shaft 8 so as to be swingable and movable within a range allowed by the gap d.

On the lower surface of the front end portion of the head support plate 9, heat-generating recording heads (thermal heads) 1 in which heating elements (not shown) for one line are arranged in a horizontal row at a fine pitch.
0 is provided.

Next, the relative positional accuracy between the recording head 10 and the platen 7 is increased and held, and a slight friction is provided between the recording head 10 and the platen 7, that is, the recording head 10 with respect to the platen 7. A means for holding a state in which the platen 7 is slightly pressed (pre-pressurized state) so that the platen 7 itself is not deformed will be described with reference to FIGS. Although FIG. 3 shows the right side surface of the present apparatus, the left side surface of the present apparatus is also provided with the same configuration as that of FIG. As shown in FIGS. 1 and 3, restriction plates 9a, 9a are formed on both sides of the head support plate 9 so as to bend downward.
Engagement pieces 9b, 9b are formed on the restriction plates 9a, 9a so as to further bend laterally. The engagement piece 9b is engaged with the upper side of the engagement portion 12a of the auxiliary lever 12 described later. The front end sides of the regulation plates 9a, 9a can contact the outer peripheral surfaces of the pair of bearings 6, 6 provided on the opening / closing member 4 when the opening / closing member 4 is in the closed position (the state of FIG. 3). Is.

As shown in FIGS. 1 and 3, both side plates 1a and 1b of the support frame 1 are provided with pins 11 and 11, respectively, and auxiliary levers 12 and 12 are swingable to the pins 11 and 11, respectively. Is supported by. The auxiliary lever 12 has an engaging portion 1
2a is provided, and the engagement piece 9b of the regulation plate 9a formed on the head support plate 9 is engaged with the upper side of the engagement portion 12a. A projecting piece 12 formed by bending the auxiliary lever 12
A central portion of the biasing spring (coil spring) 13 is provided at b. One end portion 13 a of the biasing spring 13 is hooked on the protruding end portion of the support shaft 8 which is in a fixed relationship with the support frame 1. The other end 13b of the biasing spring 13 is hooked on the engagement piece 9b of the regulation plate 9a. Therefore, the spring force of the biasing spring 13, that is, the spring force acts on each member in the direction in which the one end portion 13a and the other end portion 13b of the biasing spring 13 spread, so that the one end portion 13a of the biasing spring 13 is biased. At the same time as urging the lever 12 to swing clockwise around the pin 11, the other end 13b of the urging spring 13 moves the engaging piece 9b diagonally forward and downward (obliquely downward leftward in FIG. 3). Urge to do.

The front end edge of the engaging portion 12a of the auxiliary lever 12 comes into contact with the restricting portion 4a formed by bending the opening / closing member 4 when the opening / closing member 4 is closed (the state shown in FIG. 3). In this state (state of FIG. 3), the swinging of the auxiliary lever 12 around the pin 11 in the clockwise direction is restricted.

With this structure, when the opening / closing member 4 is in the closed position (the state shown in FIG. 3), the spring force of the other end portion 13b of the biasing spring 13 causes the regulating plate of the head support plate 9 to move. 9a is urged toward the front obliquely downward direction (the obliquely downward left direction in FIG. 3), so that the regulation plate 9a abuts the bearing 6,
Moreover, the recording head 10 is slightly pre-pressurized by the platen 7 to be in a pre-pressurized state in which slight friction is provided between the two. As a result, the recording head 10 slides forward together with the head support plate 9 and correctly faces the platen 7, the relative position between the recording head 10 and the platen 7 is maintained with high accuracy, and the recording head 10 moves toward the platen 7. The urging spring 13 slightly pressurizes the pre-pressurized state. This preliminary pressing force is so small that the platen 7 itself does not deform and is a force necessary and sufficient for feeding the recording paper P. The preliminary pressing force is set to, for example, 200 gf / platen total length (108 mm) and the recording head is set. 10 and platen 7
With a slight friction between the and, it is possible to feed the paper even while waiting for printing.

The one end portion 13a of the urging spring 13 should be hooked to the support frame 1 directly or to a member in a fixed relationship therewith, and it is essential that the one end portion 13a is hooked to the support shaft 8. Not something to do.

Further, the recording head 10 is positioned with respect to the platen 7 by bringing the front end side of the regulation plate 9a of the head support plate 9 into contact with the outer peripheral surface of the bearing 6 of the platen shaft 7a. The front end side of the regulation plate 9a of the support plate 9 may be brought into direct contact with the outer peripheral surface of the platen shaft 7a.

Next, a means for separating the recording head 10 from the platen 7 when the opening / closing member 4 is opened will be described. As shown in FIG. 4, when the opening / closing member 4 starts to open, the contact between the front end edge of the auxiliary lever 12 and the restricting portion 4a formed by bending the opening / closing member 4 is released. Therefore, the auxiliary lever 1
2 receives the spring force of the biasing spring 13 and swings clockwise around the pin 11, its engaging portion 12a lifts the regulating plate 9a upward, and the recording head 10 moves from the platen 7 together with the head supporting plate 9. Separate.

With this structure, when the opening / closing member 4 is opened, the recording head 10 is separated from the platen 7, so that neither the platen 7 nor the recording head 10 is damaged.

Next, a means for strongly pressing (mainly pressing) the recording head 10 against the platen 7 for the recording operation will be described. As shown in FIGS. 2 and 6, a pair of head pressing plates 14, 14 are swingably supported on a support shaft 8. Each one end part 14a, 14a of the head pressing plate 14, 14 extends forward, and each lower surface 14b, 14b has a head supporting plate 9
Facing the upper surface of. Here, the head pressure plates 14, 1
As shown in FIG. 2, the lower surfaces 14b and 14b of the head support plate 9 are symmetrically positioned with respect to a line (not shown) that divides the platen 7 into two parts orthogonal to the axis 7a direction.
Facing the upper surface of.

As shown in FIG. 6, the head pressure plates 14, 1
Each of the other end portions 14c and 14c of 4 is a surface that extends rearward and receives a force for releasing the pressing force, that is, a surface that engages with a cam 17 described later. In addition, the head pressure plates 14 and 1
Pressure springs 15 and 15 are stretched between the rear end portions 14d and 14d of the No. 4 and the fixed plate 2, and the springs 15 and 1
Due to the spring force of 5, the head pressing plates 14 and 14 swing counterclockwise around the support shaft 8 as a swing center and come into contact with the upper surface of the head support plate 9 to fix the recording head 10 to the platen 7. It has been repelled in the direction of pressurization.

Due to such a configuration, as shown in FIGS. 2 and 7, the tip lower surfaces 14b and 14b of the head pressing plates 14 and 14 are subjected to the spring force of the pressing springs 15 and 15, and the lower surfaces 14b and 14b of the head pressing plates 14 and 14, The upper surface of the head support plate 9 is pressed at symmetrical positions with respect to a line (not shown) that is orthogonal to the axis 7a and divided into two. As a result, even if there is an error in the accuracy of the individual parts or the accuracy of assembly of the parts, and these are accumulated and the platen 7 is inclined with respect to the support frame 1, the support portion 9c of the head support plate 9 is Since the fixed support shaft 8 is swingably engaged with the movable shaft within a range allowed by the gap d, the head support plate 9 follows the inclination of the platen 7 and pressurizes the recording head 10. The platen 7 can be evenly pressed (mainly pressed) over its entire length. The pressure applied to the platen 7 of the recording head 10 at this time is set to, for example, 2 Kgf / total platen length (108 mm). By this final pressurization, the apparatus is ready for recording for the first time.

Next, the means for releasing the main pressurization of the platen 7 of the recording head 10 will be described. As shown in FIGS. 2 and 6, both side plates 1 a, 1 of the support frame 1
A cam shaft 16 having a circular cross section is rotatably supported across the rear part of b, and a main pressurization switching cam 17 is fixed to the cam shaft 16. The main pressurization switching cam 17 faces the other end 14c of the head pressurizing plate 14, and its cam surface has a continuous shape from a large-diameter peak 17a to a small-diameter valley 17b. (See Figure 6). The cam shaft 16 is, as shown in FIG.
In the normal state (recording standby state) at the time of non-recording operation, as shown in FIG.
As shown in FIG.
The lower surface 1 of the head pressure plate 14 by contacting the other end portion 14c of the head.
4b is separated from the upper surface of the head support plate 9, and the recording head 1
The state in which the main pressurization to the platen 7 of 0 is released is maintained. A lock switching cam 22 described later is fixed to the cam shaft 16.

Next, during the recording operation, that is, the recording head 1
A description will be given of the locking means that locks the opening / closing member 4 so that the opening / closing member 4 does not open when 0 is fully applied to the platen 7. As shown in FIGS. 6 and 7, the opening / closing member 4 is closed during the recording operation. At this time, the engagement protrusion 18 is captured by the push latch 19. When the opening / closing member 4 in the closed state is pushed in from the front (left side in FIG. 6), the engaging projection 18 is released from the push latch 19, and the opening / closing member 4 is supported by the spring force of the spring 30 (see FIG. 3). Open for 1 (state of FIG. 5). During the recording operation in which recording is being performed by the recording head 10, the opening / closing member 4 is locked from opening, so that the pin 20 provided on the right side plate 1a of the support frame 1 is locked as shown in FIGS. An L-shaped lock member 21 is swingably provided.

An engaging claw 21a is provided at one end of the lock member 21.
Is provided. This engaging claw 21a is shown in FIGS.
It can be locked with a locking piece 4b formed at the rear end of the opening / closing member 4 shown in FIG. The other end 21b of the lock member 21 is engaged with the cam surface of the lock switching cam 22 fixed to the cam shaft 16. The lock member 21 includes a lock spring 2
3 is supported via the pin 20, and the spring force of the lock spring 23 urges the lock member 21 around the pin 20 in the clockwise direction to engage the engaging claw 21a with the locking piece 4b. The other end 21b is locked and the lock switching cam 2
It is urged in the direction to make elastic contact with 2. Lock switching cam 2
The cam surface 2 has a large-diameter peak portion 22a to a small-diameter valley portion 22b.
It has a continuous shape with a smooth surface (see Fig. 6).

In the state shown in FIG. 6, that is, in the state where the head pressure plate 14 does not apply the main pressure to the head support plate 9 (preliminary pressure state), the other end 21b of the lock member 21 has a large diameter of the lock switching cam 22. Since it is engaged with the mountain portion 22a, the locking member 21 holds the state in which the engaging claw 21a thereof is separated from the locking piece 4b of the opening / closing member 4 against the spring force of the locking spring 23. . In this state, the engaging projection 18 is released from the push latch 19 by pushing the opening / closing member 4 from the front (left side in FIG. 6), and the opening / closing member 4 is opened by the spring force of the spring 30 (see FIG. 3). Can be done (state of FIG. 5).

In the state shown in FIG. 7, that is, in the state where the head pressing plate 14 presses the head supporting plate 9 and the recording operation is being performed, the other end 21b of the lock member 21 is in the small-diameter valley 22b of the lock switching cam 22. Locking spring 2 because it is engaged
Due to the spring force of 3, the lock member 21 has its engaging claw 2
The state where 1a is locked to the locking piece 4b of the opening / closing member 4 is held. In this state, the opening / closing member 4 is moved forward (left in FIG. 6).
Even if it is pushed in, the locking piece 4b is prevented from being displaced, so that the opening / closing member 4 cannot be opened. That is, the opening and closing of the opening / closing member 4 is locked by the lock member 21.

Next, the mutual positional relationship between the lock switching cam 22 and the pressure switching cam 17 will be described. Figure 6
As shown in FIG.
Is engaged with the other end 14c of the head pressure plate 14 and the recording head 10 is not fully pressed against the platen 7 (preliminary pressurization state), the large-diameter peak 22a of the lock switching cam 22. Engages with the other end 21 b of the lock member 21. At this time, the opening / closing member 4 can be opened.

As shown in FIG. 7, the small-diameter valley portion 17b of the pressure switching cam 17 faces the other end portion 14c of the head pressure plate 14 so that the recording head 10 is permanently pressed against the platen 7. At this time, the small diameter valley portion 2 of the lock switching cam 22
2b is engaged with the other end 21b of the lock member 21. At this time, the opening / closing member 4 cannot be opened.

Next, a structure for rotationally driving the cam shaft 16 will be described. As shown in FIGS. 2 and 8, a gear 24 is fixed to the cam shaft 16. A forward / reverse rotation motor M1 is fixedly provided on the bottom plate 1c. The rotation from the motor M1 is transmitted to the gear 24 via the transmission train wheel 25, whereby the cam shaft 16 is driven to rotate normally and reversely.

Although the pressure switching cam 17 and the lock switching cam 22 are provided on the same cam shaft 16, they are separately configured as a first cam shaft and a second cam shaft, respectively. The shafts may be configured to be separately driven by different driving sources as required, or may be configured to be rotationally driven by the same driving source via different transmission mechanisms.

Next, a structure for driving the platen 7 to rotate will be described. As shown in FIG. 2, a motor M2 is fixedly provided on the left side plate 1b. The rotation from the motor M2 is transmitted to the platen shaft 7a via the transmission train wheel 26 and the belt 27, and the platen 7 is rotationally driven.

Next, the drive timing of the motors M1 and M2 will be described. By pressing a print button (not shown) connected to this apparatus, first, the motor M1
Starts, and the camshaft 1 passes through the transmission train wheel 25 (see FIG. 8).
6 is rotated counterclockwise from the state of FIG. 6, and when the state of FIG. 7 is reached, the motor M1 is stopped. Motor M
The stop of No. 1 is controlled by an output from a photosensor (not shown) that faces a rotary plate (encoder plate) with slits (not shown) provided on the cam shaft 16 and detects the rotation angle thereof. When the motor M1 is stopped, the motor M2 is started, and the shaft 7a of the platen 7 is rotationally driven in the paper feeding direction via the transmission wheel train 26 (see FIG. 2), and the recording operation for one screen is performed on the recording paper P. It When the recording operation for one screen is completed, the motor M2 stops and the platen 7
Stops rotating. Then the motor M1 starts immediately,
The cam shaft 16 is rotated clockwise from the state of FIG. 7 via the transmission wheel train 25, and when the state of FIG. 6 is reached, the motor M1 is stopped. Next, the loading of the roll-shaped recording paper P into the apparatus will be described. In the state of FIGS.
When the opening / closing member 4 is pushed in from the front (left side in FIG. 3),
The engaging protrusion 18 shown in FIG.
Is opened and the state shown in FIG. 5 is reached. When the opening / closing member 4 is in the fully opened state (the state shown in FIG. 5), the roll-shaped recording paper P can be stored in the recording paper holder 5. At this time, the leading edge of the recording paper P is slightly pulled out so that it is placed on the platen 7.

When the opening / closing member 4 is closed from the state shown in FIG. 5, the recording head 10 comes to the position which correctly faces the platen 7 as described with reference to FIG. 3, and the leading edge of the recording paper is shown in FIG. 6 during this closing operation. In addition, it naturally lies in a state where it is pulled out to the outside through the space between the recording head 10 and the platen 7. In the state of FIG. 6 (preliminary pressurization state), the engagement protrusion 18 and the push latch 19 are engaged, but the engagement claw 21a of the lock member 21 is engaged with the engagement piece 4b of the opening / closing member 4. And the one end 14a of the head pressure plate 14
Since the lower surface 14b of the recording head 10 does not press the recording head 10 against the platen 7, the recording head 10 is not in a recordable state but in a recording standby state.

In the state shown in FIG. 6 (preliminary pressurizing state), the peak portion 17a of the pressurizing switching cam 17 presses the other end portion 14d of the head pressurizing plate 14, so that one end portion 14a is separated from the head supporting plate 9. is seperated. Further, since the mountain portion 22a of the lock switching cam 22 raises the other end portion 21b of the lock member 21, the engaging claw 21a of the lock member 21 and the opening / closing member 4 are provided.
Is not engaged with the locking piece 4b. Therefore, the motor M1
Is driven to rotate the cam shaft 16 in the counterclockwise direction, both the pressure switching cam 17 and the lock switching cam 22 rotate in the counterclockwise direction.

As shown in FIG. 7, the crest portion 17a of the pressure switching cam 17 has the other end portion 14 of the head pressure plate 14,14.
When the pressing of c and 14c is released, the pressing springs 15 and 15
Due to the spring force of both head pressing plates 14 and 14, the head pressing plates 14 and 14 swing counterclockwise around the spindle 8.
The lower surfaces 14b, 14b of the one end portions 14a, 14a strongly press (mainly press) the recording head 10 in a direction in which the recording head 10 is evenly elastically contacted with the platen 7 in the longitudinal direction. The pressing force at this time is set to, for example, 2 Kgf / platen width (108 mm). Recording is possible for the first time by this main pressurization.

Further, as the cam shaft 16 rotates counterclockwise as described above, the peak portion 22a of the lock switching cam 22 separates from the other end portion 21b of the lock member 21.
The lock member 21 swings clockwise around the pin 20 by the spring force of the lock spring 23. Therefore, the engaging claw 21
Since a is locked to the locking piece 4b, the opening / closing member 4 cannot be pushed backward to open it, and the opening / closing member 4 is in a state of not being opened. Therefore, during the recording operation, the opening / closing member 4 does not open unexpectedly, and stable recording can be performed.

At the end of the recording operation, the motor M1 is driven again to rotate the pressure switching cam 17 and the lock switching cam 22 so that the peaks 17a and 22a are engaged with the other ends 14c and 21b. By returning to the state of FIG. 6, the recording paper P can be exchanged.

In the state of FIG. 6, the recording head 10 is in a pre-pressurized state in which the platen 7 is slightly pressed by the biasing spring 13, so that there is friction between the recording head 10 and the platen 7. It is possible to feed paper.

Further, in the state of FIG. 6, the head pressure plate 1
Since the head support plate 9 is not fully pressed by the heads 4, 14 and is in a pre-pressurized state in which the platen 7 itself is not deformed,
It is possible to prevent the platen 7 from being deformed by the pressure applied to the platen 7 by the recording head 10 for a long time.

[0046]

As described above, according to the recording apparatus of the present invention, when the opening / closing member is in the closed position, it is provided on the shaft of the platen or the opening / closing member so as to rotatably support the shaft. Since the regulation plate integral with the head support plate can contact the bearing and the regulation plate is configured to be urged toward the shaft or the bearing of the platen by the urging member, the recording head and the platen are It is possible to automatically improve the relative position accuracy of the above and improve the printing quality (Claim 1).

The pair of head pressing plates presses the upper surface of the head supporting plate at symmetrical positions with respect to a line that divides the platen perpendicular to the axial direction of the platen and is divided into two. Even if the recording heads are tilted with respect to the entire length of the platen or the platen is tilted with respect to the support frame, the rear end of the head support plate will become a fixed support shaft even if errors accumulate in accuracy. Since the head support plate is pressed so as to follow the inclination of the platen, the recording head is evenly distributed over the entire length of the platen because it is rockable and movable in the range allowed by the gap. The main pressurization can be performed (claim 2).

Since the recording paper roll holder is provided on the opening / closing member, the recording paper loading operation can be performed easily and easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view of the above.

FIG. 3 is a right side view of the above.

FIG. 4 is a right side view showing an initial state in which the opening / closing member is opened.

FIG. 5 is a right side view showing a state where the opening / closing member is fully opened.

FIG. 6 is a cross-sectional view showing a state in which the recording head is not actually pressed.

FIG. 7 is a cross-sectional view showing a state in which the recording head is fully pressurized.

FIG. 8 is a cross-sectional view showing a configuration for driving a cam shaft.

[Explanation of symbols]

 1 Support Frame 4 Opening / Closing Member 5 Holder 6 Bearing 7 Platen 7a Platen Shaft 8 Support Shaft 9 Head Support Plate 9a Regulation Plate 10 Recording Head 13 Energizing Spring 14 Head Pressing Plate 15 Pressing Spring P Recording Paper

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[Procedure amendment]

[Submission date] January 20, 1995

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Claims (3)

[Claims] 1. An opening / closing member openably / closably connected to a support frame, a platen rotatably supported by the opening / closing member, a recording head brought into contact with / separated from the platen, and the recording head at a tip portion. And a head support plate that is engaged with the support shaft that is fixed to the support frame and is swingably engaged with the support shaft that is fitted at a rear end portion thereof with a gap, and is integrally provided with the head support plate. When the opening / closing member is in the closed position, the shaft of the platen or a restricting plate that can come into contact with a bearing provided on the opening / closing member to rotatably support the shaft and the opening / closing member are in the closed position. And a biasing spring that biases the regulating plate toward the shaft or the bearing when the open / close member is in the closed position, the head support plate so that the recording head elastically contacts the platen when the open / close member is in the closed position. A recording device comprising: a pressurizing unit that pressurizes the recording device. 2. The pair of heads according to claim 1, wherein the pressurizing means presses the upper surface of the head support plate at symmetrical positions with respect to a line that divides the platen in two orthogonal to the axial direction of the platen. A recording apparatus having a pressure plate. 3. The recording apparatus according to claim 1, wherein the opening / closing member is provided with a holder for rolled recording paper.