JP2711478B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a printing apparatus that performs printing by moving a carriage on which printing means is mounted.

<Conventional Technology> Today, various recording devices have been developed with the development of information processing systems. As one recording method used in such a recording apparatus, there is a serial recording apparatus that performs recording while moving a recording head.

In the recording method, for example, in the case of ink jet recording, as shown in FIG. 12, a carriage 51 on which a recording head 50 is mounted is slidably mounted on a guide rail 52, and a motor 54 is mounted on the carriage 51 via a timing belt 53. Is configured to be able to transmit the driving force.

At the time of recording, the motor 54 is driven forward and reverse to reciprocate the carriage 51 in parallel with the platen 55, and in synchronization with this, the ink is selectively ejected from the recording head 50 to perform recording on the recording sheet 56. It is.

In the above-described ink jet recording, it is necessary to always keep the distance between the orifice surface of the recording head 50 and the recording sheet 56 constant. For this reason, conventionally, as shown in FIG. 13, a recording sheet 56 is pressed against a conveying roller 57 by a sheet pressing plate 58 so that the sheet 56 does not float off the platen 55. Further, the carriage 51 is mounted so as to be rotatable about the guide rail 52, and the abutting portion 51a formed at the front of the carriage is configured to abut against the sheet pressing plate 58 by its own weight.

As described above, the carriage front end 51a is
By moving the recording sheet along the guide rail 52 in a state where the recording sheet is in contact with the recording sheet 50, the distance between the orifice surface of the recording head 50 and the recording sheet 56 during recording becomes constant.

<Problem to be Solved by the Invention> In the recording apparatus, the transport roller 57 is not a single roller, but is divided in the axial direction as shown in FIG. This is to reduce the cost by reducing the number of rubber members constituting the roller 57 and to reduce the weight of the apparatus.

Therefore, as shown in FIG. 14, when the carriage contact portion 51a is pressed between the adjacent transport rollers 57, the sheet pressing plate 5
8 is slightly curved toward the conveying roller 57 side. When the carriage 51 moves without contacting the curved sheet pressing plate 57, the carriage 51 swings around the guide rail 52 in the direction of arrow B in FIG. 13 along the curve.

Therefore, there is a problem that the interval between the carriage 51 and the recording sheet 56 is not constant at the time of recording, and the recorded image is wavy as a whole.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to provide a recording apparatus capable of recording a clear image while preventing a sheet holding member from bending.

<Means for Solving the Problems> A typical means according to the present invention for solving the above problems is a conveying rotating body which is attached separately in a rotation axis direction and rotates to apply a conveying force to a sheet. A sheet pressing member for contacting the conveying and rotating body, a recording unit for recording an image on the sheet, and a carriage mounted with the recording unit and movable in contact with the sheet pressing member. The length of the contact portion where the carriage comes into contact with the sheet pressing member in the carriage moving direction is configured to be substantially equal to the length between the divided transport rotary members.

<Operation> In the above-described means, since the length between the conveying rotary members and the length of the contact portion are substantially equal, the pressing force on the sheet pressing member by the contact portion is the portion supported by the conveying rotary member. To work. As a result, the sheet pressing member hardly bends even when pressed by the carriage contact portion. Accordingly, when the carriage reciprocates during recording, the carriage does not swing, and a clear image is recorded.

<Embodiment> Next, an embodiment of the present invention in which the above means is applied to a serial type bubble jet recording system will be described.

FIG. 1 is an overall perspective view of the recording apparatus, and FIG. 2 is a schematic side view.

(Overall Configuration) First, the overall configuration of the apparatus will be described. The recording sheet 1 is transported by the sheet transport unit 2. At this time, the recording sheet 1 is pressed by a conveying roller 2a, which is a conveying rotating body divided in the axial direction by a sheet pressing member 3, and a platen 4
It is configured so that it does not rise from. When the recording sheet 1 is conveyed, the carriage 5 is reciprocated along the guide rail 6, and the recording means 7 is driven to record an image on the recording sheet 1, and the recorded sheet 1 is discharged by the discharging means 8.
It is configured to discharge by means of

A contact portion 5 a is formed at the front end of the carriage 5, and the contact portion 5 a contacts the sheet pressing member 3. The length of the contact portion 5a is substantially made equal to the length l ₁ between the transport rollers 2a mutually adjacent.

The carriage 5 is reciprocated by transmitting a driving force of a carriage motor 9 serving as a driving source via a transmission means 10.

Next, the configuration of each unit of the recording apparatus will be specifically described.

(Sheet Conveying Means) The sheet conveying means 2 is for conveying the recording sheet 1 to the recording means 7, and in this embodiment, as shown in FIG. Auto ・ Sheet
(Feeder) 11 or a recording sheet manually fed from the manual feed slot 12.

In the sheet conveyance means 2 in this embodiment, the conveying rollers 2a for rotationally driving direction of the arrow a of FIG. 2, the recording sheet 1 by the front pinch rollers 2b ₁ and the rear pinch rollers 2b ₂ that this driven rotary It is configured to be transported.

The transport roller 2a has both ends on the left and right side walls of the apparatus frame.
The roller shaft 2c is rotatably supported by 13a and 13b.
Distance l ₁ between 2a is arranged to be about 25Mm～55mm.

And wherein the roller shaft 2c as shown in FIG. 1, the conveyance gear 2d ₁ is attached, the gear 2d ₁ is an idler gear 2d
_2, and the idler gear 2d ₂ is a first transmission gear 2d
₃ is in mesh. Wherein the first axis of the transmission gear 2d ₃ is attached a second transmission gear 2d ₄ and the third transmission gear 2d _5, it is configured to rotate integrally. And said third transmission gear 2d ₅ is engaged with the motor gear 2d ₆ attached to the transport motor 2e.

Therefore, when the transport motor 2e is driven and rotated, the rotational force is transmitted to the transport roller shaft 2c via the gear,
The transport roller 2a rotates.

The pinch rollers 2b ₁ and 2b ₂ are respectively pressed against the surface of the transport roller 2a by a spring or the like (not shown), and
It is installed so that it can rotate following the rotation of. Accordingly, the recording sheet 1 is conveyed force by being nipped by the conveying rollers 2a and the rotating pinch rollers 2b _1, 2b ₂ is applied.

Below the transport roller 2a, a paper pan 2f curved along the peripheral surface of the transport roller 2a as shown in FIG.
Is attached. The paper pan 2f extends to the manual feed slot 12, and is configured to serve as a lower guide of the manually fed recording sheet 1.

Further, upper guide plates 2g, 2h are attached above the paper pan 2f at a predetermined interval, and constitute a conveying path of the recording sheet 1.

In the above configuration, when the transport motor 2e is driven to rotate the transport roller 2a in the direction of the arrow a in FIG. 2, the recording sheet 1 fed from the ASF 11 is separated by the front pinch roller 2b ₁ and the transport roller 2a. is nipped, the conveying roller 2a is conveyed in U along the periphery turn, is conveyed to the recording position located above is nipped by the rear pinch rollers 2b ₂ and the transport rollers 2a further.

On the other hand, the recording sheet 1 fed from the manual feed port 12 is nipped by the conveying rollers 2a and the rear pinch rollers 2b _2, is intended to be conveyed to the recording position.

Here, the recording sheet 1 is automatically fed to the conveying means 2.
ASF11 will be briefly described.

This is detachable from the recording apparatus, and as shown in FIG. 2, the recording sheet 1 accommodated in the cassette 11a.
The uppermost sheet 1 is pressed by a separation roller 11c by a pressing spring 11b, and when the separation roller 11c rotates in the direction of arrow b in FIG. The roller contacts the nip between the roller 11d and the upper roller 11e pressed against the roller 11d. When the registration roller 11d rotates in the direction of arrow c in FIG. 2, the recording sheet 1 is nipped by the registration roller 11d and the upper roller 11e which is driven to rotate, and is fed to the sheet conveying means 2. .

The configuration for transmitting the driving force to the registration roller 11d is as follows.
As shown in the figure, a registration gear 11g is attached to a roller shaft 11f to which a registration roller 11d is attached, and the registration gear 11g is connected to an idler gear 2d ₂ via an idler gear 11g _1.
Is engaged.

On the other hand, in the configuration for transmitting the driving force to the separation roller 11c, a separation gear 11i is mounted on a roller shaft 11h on which the separation roller 11c is mounted, and idler gears 11j and 11k are sequentially meshed with the gear 11i. Furthermore the gear 11k and the gear 11l attached to the same shaft is meshed with the second transmission gear 2d _4.

Therefore, when the transport motor 2e is driven, a driving force is transmitted through the gear train, and the separation roller 11c and the registration roller 11d are driven and rotated.

(Sheet Pressing Member) The sheet pressing member 3 is for pressing the recording sheet 1 conveyed by the conveying means 2 against the conveying roller 2 to prevent the recording sheet 1 from floating from the platen 4.

As shown in FIG. 1, the sheet pressing member 3 is formed of a single plate-like member wider than the moving range of the carriage 5 so as to press the entire width of the recording sheet 1. Each pressing roller 2a
Is pressed against.

The leading end of the sheet pressing member 3 is located below the recording position of the recording means 7 and the conveyed recording sheet 1
Is pressed against the transport roller 2a by the member 3. As a result, the recording sheet 1 at the recording position does not rise from the platen 4.

Further, as described later, the front end of the carriage 5 is configured to always contact the sheet pressing member 3.

(Carriage) The carriage 5 is for reciprocating the recording means 7 in the width direction of the recording sheet 1.

The carriage 5 is slidably attached to a guide rail 6 having a circular cross section fixed at both ends to left and right side walls 13a and 13b.

The carriage 5 is mounted so as to be rotatable around the guide rail 6, and as shown in FIG. 3, is mounted so that the front of the carriage 5, that is, the side facing the recording sheet 1 is lowered forward. As a result, the carriage 1 and the recording means 7 mounted on the carriage 1 receive force in the direction of arrow c in FIG. 3 by their own weight, and the urging force causes the front end of the carriage to contact the sheet pressing member 3. . The carriage 5 of the present embodiment receives a biasing force in the direction of arrow c by the timing belt 10e in addition to the weight of the carriage 5 as described later.

Wherein the carriage front end contact portion 5a is formed, the contact portion 5a is configured to a length l ₂ or more, as shown in Figure 4. The length l ₂ is substantially made equal to the length l ₁ between the transport rollers 2a, which are in split to the sheet conveying means 2 described above.

The contact portion 5a slides while pressing the sheet pressing member 3 during recording. At this time, the sheet pressing member 3 receives a force that bends between the transport rollers 2a as shown in FIG. However, in the present embodiment, the transport roller 2a
For lengths of l ₁ and the contact portion 5a between the mutual l ₂ and is substantially equal configuration, the pressing force of the sheet pressing member 3 by the contact portion 5a it is supported by the conveying rollers 2a portion To work. As a result, the sheet pressing member 3 hardly bends even when pressed by the carriage contact portion 5a. Therefore, when the carriage 5 reciprocates during recording, it does not swing in the direction of the arrow c in FIG. 3, and the interval between the recording means 7 mounted on the carriage 5 and the recording sheet 1 is always constant. Thus, the image is not disturbed.

The length l ₂ of the contact portion 5a from the reasons it is desirable to configure the length l ₁ of the same or more between the transport rollers 2a. However, it is possible to almost achieve the same effect even if slightly shorter configuration than the length l _1. Incidentally, in the present embodiment, there is set the length l ₂ of the abutment portion 5a in about 40Mm～55mm.

(Transmission Unit) The transmission unit 10 transmits the driving force of the carriage motor 9 to the carriage 5 in order to reciprocate the carriage 5.

As shown in FIG. 1, the drive pulley 10a is attached to one end of the moving range of the carriage 5 and the driven pulley 10b is attached to the other end, as shown in FIG.
The carriage motor 9 is connected to 0a. Further, an endless timing belt 10c is stretched between the pulleys 10a and 10b in parallel with the guide rail 6, and a part of the timing belt 10c is fixed to the carriage 5.

Therefore, when the carriage motor 9 is driven forward and backward, the driving force is transmitted to the carriage 5 via the timing belt 10c, and the carriage 5 reciprocates along the guide rail 6.

Here, the timing belt 10c is fixed so as to urge the carriage 5 in the direction of arrow c in FIG. Next, the configuration will be specifically described.

FIG. 5 is a view of a portion where the timing belt 10c is fixed to the carriage 5 viewed from the rear with respect to the recording surface.
FIGS. 7A and 7B are an explanatory view of a fixing member for fixing the belt 10c to the carriage 5 and an explanatory view of a fixed state.

A belt stopper 14 is formed at the rear of the carriage 5. The belt stopper 14 is provided at the same height as the timing belt 10c when the timing belt 10c is stretched.

As shown in FIG. 6 (a), the belt stopper 14 has a lower member 14a and an upper member 14b provided at a predetermined interval. The lower member 14a is a top gear portion 14a ₁ is formed on, the teeth of the timing belt 10c is fixed so as to meet this toothing 14a _1. On the other hand, it is configured to cross-section to the upper member 14 "U" shape, both end portions in the notch 14b ₁ such that the fixing member 15 to be described later can be halted fit engagement are formed. (Fig. 6 (b)
reference).

The fixing member 15 has a vertical section "H" as shown in FIG.
Jo to be formed becomes in, at both ends top of transverse plate portions 15a engaging portion 15b for engagement with the notch 14b ₁ of the upper member 14b is formed. Protrusions 15c for bending the timing belt 10c are formed at the lower portions on both ends of the horizontal plate portion 15a.

The gap between the upper and lower members 14a, 14b of the belt stopper 14,
The thickness is slightly larger than the thickness of the overlap of the timing belt 10c and the horizontal plate portion 15a. Therefore, as shown in FIG. 5, when the tooth profile of the timing belt 10c is matched with the tooth profile portion 14a ₁ of the lower member 14a, and the horizontal plate portion 15a of the fixing member 15 is inserted between the upper and lower members 14a, 14b, The belt 10c is fixed to the belt stopper 14. At this time the engaging portion 15b is engaged locks and fixing member 15 in the notch 14b ₁ of the upper member 14b becomes unremovable state, the fixing member 15 is prevented from falling off from the belt retaining portion 14.

The timing belt 10c is fixed by the fixing member 15 as described above.
When the fixing belt 15 is fixed to the belt stopper 14, the timing belt 10c is pushed down by the projection 15c of the fixing member 15 so as to bend downward from a straight state as shown in FIG.

When the timing belt 10c is in a curved state as described above, the carriage 5 receives an urging force upward in FIG. 5A by the tension of the belt 10c. Accordingly, the carriage 5 receives an urging force rotating in the direction of arrow c in FIG.
Thus, the contact portion 5a of the carriage 5 is pressed against the sheet pressing member 3 by the urging force in addition to the weight of the carriage 5 and the recording means 7.

For this reason, even if the timing belt 10c vibrates when the carriage 5 is turned over during recording, the contact portion 5a always maintains the state of contact with the sheet pressing member 3, and the recording means 7 mounted on the carriage 5 And the recording sheet 1 is always kept constant.

(Recording Unit) The recording unit is mounted on the carriage 5 as described above, and records an ink image on the recording sheet 1 conveyed by the conveying unit 2. As a recording means in this apparatus, an ink jet recording system is suitably used.

The ink jet recording system is provided with a liquid ejection port for ejecting and ejecting the recording ink liquid as flying droplets, a liquid flow path communicating with the ejection port, and a part of this liquid flow path, Discharge energy generating means for providing discharge energy for causing the ink liquid to fly. Then, the ejection energy generating means is driven in accordance with the image signal to eject ink droplets and record an image.

As the ejection energy generating means, for example, a method using a pressure energy generating means such as an electromechanical transducer such as a piezo element, an electromagnetic energy generating means for irradiating an ink such as a laser or the like with an ink liquid to generate flying droplets And a method using thermal energy generating means such as an electrothermal converter. Among them, a method using a heat energy generating means such as an electrothermal converter is preferable because the ejection ports can be arranged at a high density and the recording head can be made compact.

In this embodiment, a bubble jet recording method, which is one of the ink jet recording methods, is used as the recording means.

FIG. 7 is an explanatory view of the configuration of the recording head 7 constituting the recording means, and FIGS. 8 (a) to 8 (g) are explanatory views of the principle of bubble jet recording.

In FIG. 7, reference numeral 7a denotes a heater board on which an electrothermal transducer (discharge heater) 7b and an electrode 7c made of aluminum or the like for supplying electric power are formed on a silicon substrate. . The heater board 7a is formed by bonding a top plate 7e having a partition for partitioning a flow path (nozzle) 7d of the recording liquid. As shown in FIG. 1, an ink cartridge 7f for supplying ink to the recording head 7 is replaceably mounted on the left side of the apparatus.

The ink supplied from the ink cartridge 7f via a conduit (not shown) is supplied to a hot water port 7e provided on a top plate 7e.
_{From 1} , the common liquid chamber 7 g in the recording head 7 is filled, and guided from the common liquid chamber 7 g into each nozzle 7 d. These nozzles
The 7d are formed ink discharge ports 7d _1, also the discharge port 7d ₁ is formed at a predetermined pitch in the sheet conveyance direction so as to face the recording sheet 1 of the recording head 7 (the vertical direction in FIG. 1) ing.

Here, the ink flying principle in the bubble jet recording method will be described with reference to FIGS. 8 (a) and 8 (b).

In a steady state, as shown in FIG. 8A, the surface tension and the external pressure of the ink 16 filled in the nozzle 7d are balanced at the ejection port surface. When the ink 16 flies in this state, electricity is supplied to the electrothermal transducer 7d in the nozzle 7d, and the ink in the nozzle 7d exceeds the nucleate boiling and causes a rapid temperature rise. Then, as shown in FIG. 8 (b), the ink adjacent to the electrothermal transducer 7d is heated to generate fine bubbles, and the ink in the heated portion is vaporized to cause film boiling, and As shown in FIG. 3C, the bubbles 17 grow rapidly.

When the bubble 17 grows to the maximum as shown in FIG. 8 (d), the ink droplet is pushed out from the discharge port in the nozzle 7d. When the energization of the electrothermal transducer 7d is completed, the eighth
As shown in FIG. 7E, the grown bubble 17 is cooled and contracted by the ink 16 in the nozzle 7d, and the ink droplet flies from the discharge port due to the growth and contraction of the bubble. And the eighth
As shown in FIG. 7F, the ink is brought into contact with the surface of the electrothermal transducer 7b and rapidly cooled, and the bubbles 17 disappear or shrink to a volume that can be almost ignored. When the bubble 17 contracts, as shown in FIG. 8 (g), ink is supplied from the common liquid chamber 7g into the nozzle 7d by capillary action to prepare for the next energization.

Therefore, the ink image is recorded on the recording sheet 1 by energizing the electrothermal converter 7b in accordance with the image signal in synchronization with the movement of the carriage 5.

As shown in FIG. 1, a capping means 18 is provided at the left end of the moving range of the carriage 5. The capping means 18 is used when the recording head 7 is not used.
By covering the ink ejection surface of the recording head 7, the ink near the ejection port of the recording head 7 has a function of preventing drying and solidification accompanying the drying.

Further, a pump (not shown) is connected to the capping means 18 so as to drive the pump for ink ejection failure or removal or to prevent them, and to perform a recovery process by sucking ink from the ejection port by the suction force. It has become.

(Ejecting Means) The ejecting means 8 is for ejecting the recording sheet 1 recorded by the recording means 7.

As shown in FIG. 1 and FIG. 2, this configuration comprises a discharge roller 8a and a spur 8b that comes into contact with the discharge roller 8a. The discharge at the end of the roller shaft 8c of the roller 8a is attached discharge gear 8d, the discharge gear 8d is idler 2d ₂ meshes.

Therefore, when the transport motor 2e is driven, the driving force is transmitted to the discharge roller 8a, the roller 8a rotates, and the recording sheet 1 is discharged by the cooperation of the discharge roller 8a and the spur 8b. The discharged recording sheet 1 is stacked on a discharge stacker 8f located above the discharge roller 8a.

As described above, the recording apparatus in this embodiment is configured to perform recording by reciprocating the carriage 5 with respect to the conveyed recording sheet 1, and the carriage 5 is moved by the timing belt 10c to hold the sheet pressing member 3. Biased in the direction. As a result, the carriage contact portion 5a always contacts the sheet pressing member 3, and the discharge port of the recording head 7 and the recording sheet 1 always maintain a constant interval.

Further, since the length of the contact portion 5a is configured to be substantially equal to the interval between the divided transport rollers 2a, even if the contact portion 5a presses the sheet pressing member 3, the sheet pressing member 3 Are supported by the transport rollers 2a, and the bending of the sheet pressing member 3 between the transport rollers 2a is prevented.

Therefore, the carriage 5 moving in contact with the sheet guide member 3 disposed in parallel with the platen 4 moves in parallel with the recording sheet 1 supported by the platen 4, and the recording head mounted on the carriage 5 moves. The gap between the discharge port 7 and the recording sheet 1 is kept constant.

Therefore, a recorded image due to ink ejection from the recording head 7 does not wave, and a high-quality image is recorded.

[Other embodiments]

 Next, another embodiment of the present invention will be described.

(Sheet conveying means) In the embodiment described above, the conveying rollers 2a and the pinch rollers 2b _1, has been configured to impart conveyance force 2b ₂ to the recording sheet 1, the sheet conveying means 2 is not necessarily roller driving The recording sheet 1 may not be constituted by a sheet-like member, and the conveying force may be applied to the recording sheet 1 by, for example, a rotating belt having a rotatable endless belt.

In the above-described embodiment, the pinch rollers 2b ₁ and 2b ₂ are pressed against the conveying roller 2a, and the recording sheet 1 is nipped and conveyed by these rollers. 3 may be brought into pressure contact with each other to apply a conveying force to the recording sheet 1 by the cooperative action of the two members 2a and 3.

(Recording Means) As a configuration of the recording means, in addition to the combination of the above-described discharge port, liquid path, and electrothermal converter, U.S. Pat. 59-1 Kaisho
Those disclosed in, for example, Japanese Patent No. 23670 can also be employed.

The above-described recording means has shown an example in which ink is supplied from the ink cartridge 7f mounted on the recording apparatus to the recording head.However, an ink storage chamber is provided in the recording head, and the ink in the ink storage chamber is depleted. In this case, a disposable recording head may be used in which the recording head is replaced.

Further, the present invention does not need to be limited to the bubble jet recording method described above as the recording means. For example, a so-called thermal transfer recording method in which an ink sheet coated with a heat-meltable ink is heated according to an image signal and the melted ink is transferred to the recording sheet 1, a so-called heat transfer method in which the recording sheet 1 which develops color by heat is heated according to an image signal. Various recording methods such as a thermal recording method and a so-called wire dot recording method in which an ink ribbon is hit with a wire according to an image signal to perform recording can be employed. Therefore, the recording head is not limited to the above-described bubble jet head, and for example, a thermal head, a wire dot head, a daisy wheel head, or the like can be used.

(Fixing of Timing Belt) Next, another embodiment of fixing the timing belt 10c to the carriage 5 is shown in FIG. Note that the same functional portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 9 is a view of the belt fixing portion viewed from the rear of the apparatus. A protrusion 15c provided on the fixing member 15 is provided only on the left side of the horizontal plate portion 15a.
Is curved.

Generally, in a serial recording apparatus that performs recording while moving the carriage 5 in the direction of arrow d in FIG. 9, the fixed position of the timing belt 10c with respect to the carriage 5 is set to a position deviated to the right in the recording direction from the center of the carriage. You. This is because the position of the carriage motor is restricted. In such an apparatus, the carriage 5
Is moved in both the left and right directions to perform printing. As shown in FIG. 9, when printing is performed by moving to the right (the direction of arrow d), the printing is stabilized. However, by moving the carriage 5 to the left, printing is performed. Is performed, the drive transmission action from the timing belt 10c is deviated to the right, so that the driving becomes unstable and the backlash is likely to occur.

On the other hand, in the embodiment shown in FIG.
Since the timing belt 10c is fixed so as to be curved substantially at the center of the carriage 5 by the protrusion 15c provided only on the left side of the carriage 15a, the point of the drive transmission from the belt 10c is substantially at the center of the carriage 5. . Therefore, when moving the carriage 5 in either the left or right direction, the carriage 5
Movement becomes stable.

Also in this embodiment, since the carriage 5 is urged by the pressing member 3 by the curvature of the belt 10c, the interval between the recording means 7 and the recording sheet 1 is always kept constant.

Therefore, by configuring as described above, high-quality bidirectional recording can be performed.

The timing belt 10c need not always be fixed substantially at the center of the carriage 5 as described above.

For example, as shown in FIG. 10, the protrusion 15c may be provided only on the right side of the horizontal plate 15a. In this case, as described above, since the point of application of the driving force from the timing belt 10c is biased to the right side of the carriage 5, the carriage 5 is stabilized in the rightward movement (the direction of the arrow d). Therefore, in a one-way printing apparatus that performs printing only when the carriage 5 moves rightward, if configured as shown in FIG.
It is possible to record a high-quality image by effectively preventing the carriage 5 from rattling.

In the above-described embodiment, an example is shown in which the driving force to the carriage 5 is transmitted via the timing belt 10c. However, the driving force may not be a belt-like one, and may be, for example, a wire. The good is natural.

(Carriage abutting portion) In the embodiment described above, linearly contiguous to constitute a carriage abutting portion 5a in the moving direction, substantially equal to the length l ₂ the distance l ₁ between the transport rollers 2a However, the contact portions 5a do not necessarily have to be continuous.

For example, as shown in FIG. 11, the contact portion 5a _1, 5a ₂ of length l ₃ provided at the front end portion sides of the carriage 5, each abutment portion 5a _1, 5a ₂
It may be provided a notch 5a ₃ of length l ₄ between. In this case, the point where the carriage abutting portion 5a _1, 5a ₂ is pressed against the sheet pressing member 3 to attempt to bend between the transport rollers 2a are both end portions of the abutment portion 5a _1, 5a _2. Therefore, if the length 2l ₃ + l ₄ between the both ends is substantially equal to the distance l ₁ between the conveying rollers 2a, the sheet pressing member 3 with which the contact portions 5a ₁ and 5a ₂ contact as in the above-described embodiment. The curvature is extremely small.
Therefore, the carriage 5 moves without vibrating while being in contact with the sheet pressing member 3.

The recording device may be used as an image output terminal of an information processing device such as a computer.
The present invention can be applied to a copying machine combined with a reader or the like, and further to a facsimile machine having a transmission / reception function.

<Effects of the Invention> As described above, the present invention is configured such that the length of the carriage abutting portion in the carriage moving direction is substantially equal to or greater than the length between the conveying rotating members, so that the sheet pressing by the abutting portion is performed. The pressing force applied to the member acts on the portion supported by the transport rotating body. As a result, the sheet pressing member hardly bends even when pressed by the carriage contact portion, and can record a clear image by preventing the carriage from reciprocating when recording. .

[Brief description of the drawings]

FIG. 1 is a schematic side view of a serial type bubble jet recording apparatus according to an embodiment of the present invention, FIG. 2 is a side sectional view, and FIG. 3 is a state in which a carriage is urged toward a sheet pressing member. FIG. 4 is an explanatory view showing the relationship between the distance between the conveying rollers and the length of the carriage contact portion, and FIG.
FIGS. 6A and 6B are explanatory diagrams showing a configuration of a timing belt fixed to a carriage, FIGS. 6A and 6B are explanatory diagrams showing a configuration of a belt stopper and a fixing member, FIG. a) to (g) are illustrations of the principle of bubble jet recording, FIGS. 9 and 10 are illustrations showing another embodiment of the fixing structure of the timing belt, and FIG. FIG. 12 to FIG. 14 are explanatory diagrams showing the relationship with the length of the carriage contact portion having the following. 1 is a recording sheet, 2 is a sheet conveying means, 2a is a conveying roller, 2b ₁ and 2b ₂ are pinch rollers, 2c is a roller shaft, 2d ₁ is a conveying gear, 2d ₂ is an idler gear, 2d ₃ is a first transmission gear, 2d _Four
Is the second transmission gear, 2d ₅ is the third transmission gear, 2d ₆ is the motor gear, 2e is the transport motor, 2f is the paper pan, 2g and 2h are the upper guide plate, 3 is the sheet holding member, 4 is the platen, and 5 is the platen. Carriage, 5a is a contact part, 5a ₁ and 5a ₂ are contact parts, 5a ₃ is notched, 6 is a guide rail, 7 is a recording means, 7a is a heater board, 7b is an electrothermal converter, 7c is an electrode, 7d Is a nozzle, 7d ₁ is a discharge port, 7e is a top plate, 7e ₁ is a supply port, 7f is an ink cartridge, 7g is a common liquid chamber, 8 is discharge means, 8a is a discharge roller,
8d is a spur, 8c is a roller shaft, 8d is a discharge gear, 9 is a carriage motor, 10 is a transmission means, 10a is a drive pulley, 10b is a driven pulley, 10c is a timing belt, 11 is ASF, 11a is a cassette, and 11b is pressing. Spring, 11c is separation roller, 11d
Is a registration roller, 11e is an upper roller, 11f is a roller shaft, 11
_{g, 11g 1, 11h, 11i} , 11j, 11k, 11l the gear, 12 manual feed slot,
13a is a frame left side wall, 13b is a frame right side wall, 14 is a belt stopper, 14a is a lower member, 14a ₁ is a toothed portion, 14b is an upper member,
Reference numeral 15 denotes a fixing member, 15a denotes a horizontal plate portion, 15b denotes a locking portion, 15c denotes a protrusion, 16 denotes ink, 17 denotes air bubbles, and 18 denotes capping means.

Claims (5)

(57) [Claims] 1. A conveying rotating body which is attached separately in a rotation axis direction and rotates for applying a conveying force to a sheet, a sheet pressing member which comes into contact with the conveying rotating body, and an image is recorded on the sheet. And a carriage movable by pressing and contacting the sheet pressing member, wherein the length of the contact portion in which the carriage contacts the sheet pressing member in the carriage moving direction is divided. A recording device having a length substantially equal to or greater than the length between the conveyed rotating bodies. 2. The recording apparatus according to claim 1, wherein a notch is provided in a part of the contact portion formed on the carriage. 3. The recording apparatus according to claim 1, wherein said recording apparatus is an ink jet recording head in which said recording means discharges ink according to a signal to store an image. 4. The recording apparatus according to claim 3, wherein said recording apparatus is an ink jet recording head for recording an image by ejecting ink using thermal energy. 5. The recording apparatus according to claim 1, wherein the recording means supplies a current to the electrothermal converter in response to a signal, causes the electrothermal converter to cause film boiling, and discharges the ink from a discharge port to record an image. The recording apparatus according to claim 4, wherein the recording apparatus is an inkjet recording head.