JPH03101981A - Ink-jet recording device - Google Patents

Abstract

PURPOSE:To miniaturize a paper keep plate while obviating a special space for a means energizing pushing force to the paper keep plate by installing an elastic member being mounted along the bottom of a device, energizing a paper hold-down member and pushing a platen by abutting. CONSTITUTION:A paper keep plate 38 composed of fluoroplastics, a carbon-fiber mixing material, etc., forms a regular interval between the discharge opening surface of a recording head 9 and recording paper by operating pushing force to recording paper fed. The elastic force of a metal leaf 38D constitutes the pushing force of the paper keep plate 38. The mechanism has a D-shape formed by linearly notching one part of a circumference, and is located at a position where the paper keep plate 38 and the notch section of a shaft 34A slidable in the direction of rotation are abutted against the end section 38F of the metal leaf 38D, and the end section 38E of the paper keep plate receives upward energizing force by the metal leaf 38D. Consequently, the paper keep plate 38 intends to be turned in the clockwise direction centering around a shaft 38A, and works pushing force to a paper-feed roller 36. When pushing force is released, the metal leaf 38D is downward pushed down as a whole, thus preventing the reception of energizing force from the metal leaf 38D of the end section 38E.

Description

[Detailed description of the invention] [Field of use in business a] The present invention relates to an inkjet recording device.

[Prior Art] This type of apparatus includes, in addition to the configuration related to direct recording, a configuration specific to a method of recording by ejecting ink.

In other words, depending on the recorded data, if a certain ejection port does not eject for a long time, or if the device itself is not used for a long period of time, the ink in the ejection port or the ink chamber communicating with the ejection port may increase due to water evaporation. This may cause viscosity and non-ejection, and ink droplets may form on the ejection orifice surface where the ejection orifice is installed. Water droplets, dust, etc. may adhere to the ink droplets, and the ejected ink droplets may be pulled by these adhering substances, causing the ejection direction to be deflected. For this reason, inkjet recording devices
In order to prevent ejection failure or deflection of the ejection direction, various configurations are provided as a so-called ejection recovery system.

These ejection recovery systems include a preliminary ejection system for ejecting ink onto a predetermined ink-receiving medium and eliminating additional ink, etc., to prevent ejection failures. Ink suction for sucking ink from the ejection port or ink chamber to remove the above.
Furthermore, each type has a cabling structure to seal the ejection port surface and prevent ink moisture from evaporating from the ejection port. Furthermore, as a structure to prevent deflection of the ejection direction, the ejection port surface is wiped to prevent dust from adhering to the vicinity of the ejection port. There is a configuration for removing ink droplets and the like.

Furthermore, in recent years, it has become common for inkjet recording apparatuses to be able to record on various types of recording media such as plain paper envelopes, and configurations have been adopted to accommodate the particular thickness of these recording media. That is, a mechanism is provided for adjusting the distance between the recording head and the recording medium so that the distance between the recording head and the recording medium is appropriate during recording, depending on the recording medium used. On the other hand, in recent years, inkjet recording devices, particularly recording heads, have been manufactured using semiconductor film forming processes and microfabrication techniques, and smaller and cheaper recording heads are being realized. This results in
For example, a disposable type recording head with an integrated ink tank has also been proposed.

Along with this, there is a demand for an inkjet recording device that is compact and inexpensive, and that is easier for users to use. [Problems to be Solved by the Invention] However, miniaturization of such a device requires that the space for the arrangement or operation of the members constituting the device is limited, and that the members themselves are made smaller. As a result, not only the above-mentioned configurations but also the other configurations of the device and the related mechanisms between these configurations need to be different from those of relatively large devices. Among such configurations, the paper press plate for regulating the recording surface of the recording paper by pressing the recording paper against the platen side is subject to various restrictions due to miniaturization of the apparatus and the like. In other words, in the past, an elastic member such as a spring plate was often directly used as the paper presser plate, but as the paper feed roller that also serves as a platen becomes smaller, the paper presser plate also needs to be made smaller. . However, due to this miniaturization, the elastic force of the paper presser plate increases relatively, and there is a possibility that the force pressing the paper presser plate becomes too strong when conveying the recording paper. In addition, elastic members have problems such as settling during long-term use and not applying the appropriate pressing force initially set, and variation in pressing force between paper presser plates due to variations in elastic members. was there.

On the other hand, when pulling out the recording paper from the conveyance path or adjusting the position of the recording paper, there may be cases where the pressing force of the paper presser plate is released. This was done by separating the platen from the platen.

However, as the device becomes smaller, there is a possibility that there will be little room for this rotation, especially in the case of interference with the moving path of the recording head. The present invention has been made based on the above-mentioned points of view, and its purpose is to provide a paper press plate with a small size and a special means for applying a press force to the paper press plate. An object of the present invention is to provide an inkjet recording device that does not require a large space and does not interfere with the recording head and the paper presser plate when the pressing force of the paper presser plate is released.

[Means for Solving the Problem] For this purpose, the present invention provides an inkjet recording apparatus that performs recording by ejecting ink droplets onto a recording medium, which includes a platen that regulates the recording surface of the recording medium, and a platen that regulates the recording surface of the recording medium. a paper pressing member provided so as to be able to come into contact with the apparatus; and an elastic member provided along the bottom of the apparatus for biasing the paper pressing member and pressing the platen by the contact. It is characterized by:

Further, the inkjet recording apparatus is characterized in that it includes a biasing release means for releasing the biasing force applied to the paper pressing member by the elastic member. [Function] According to the above configuration, the paper pressing member that directly presses the platen and the means for generating the pressing force thereof are separate,
Also, by disposing this means along the bottom C of the device,
The paper pressing member can be miniaturized and no special space is required for the above means.

Further, the pressing force on the paper pressing member is only released, and for example, when the recording medium is pulled out from between the paper pressing member and the platen, the pressing force of the paper pressing member on the platen is released. In this case, the paper holding member will not change its position significantly. [Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is an external perspective view of an inkjet recording apparatus according to an embodiment of the present invention, Fig. 2 is a perspective view of the main parts of the apparatus shown in Fig. 1 excluding the case, etc., and Fig. 3 (^) and (B) are also diagrams mainly showing the paper ejection system of the apparatus shown in FIG. 1. In FIG. 1, numeral 100 indicates an inkjet recording device, and this device loo can be used either when it is mounted as shown in the same figure or when it is used when it is mounted vertically as described later. etc., and are relatively small. 101 is a device case, 102 is an outer lid, and 103 is an inner lid.
02 is superimposed, and the device 10G becomes compact. This allows the user to carry the recording device, for example, by putting it in a dedicated storage bag. In addition, the outer M102 can also be used as a paper feed guide for the recording paper 4o as shown in the figure.
06 is the paper feed port. Furthermore, the outer iI 102 can also be used as a paper output tray, as will be described later.

In any of the above cases, reference numeral 107 in the figure is the paper ejection port. ios above, ii 102 position fixing hooks, also 1
04 is the operation key. This is a display section, etc.

Next, the configuration of the main parts of the apparatus will be explained with reference to FIG.

In the figure, 1 is a chassis, and a left side plate 1a and a right side plate 1b, which also serve as guides for recording media such as paper, are erected on the rear side. Further, the chassis 1 is provided with a motor mounting hole for rotatably supporting a carrier motor, which will be described later, but is not shown.

lh is a lead arm that supports a lead screw, which will be described later, in the axial and radial directions, and is a bearing part (not shown).
It is pivoted on.

2 is a lead screw, and leads 12a are formed at a predetermined pitch facing the recording range. Further, on the carrier home position side of the lead screw 2, a position groove 3b for setting a position for performing cap and discharge recovery is formed along a cross section perpendicular to the screw axis. Further, the lead pad 28 and the position groove 3b are smoothly continuous with each other by the introduction groove 3C.

A shaft 2g is provided at the right end of the lead screw 2, and a shaft is also provided at the left end, which are fitted into bearings provided on the front plate 1c and the lead arm tb, respectively.
It is rotatably supported relative to them. 3 is the groove 3b mentioned above
, 3c, and is a lead bobbin provided on the shaft of the lead screw 2, and the end thereof (a pulley 3a is provided).The driving force is applied to the bobbin 3a from the motor l1 via the timing belt 13. Further, the shaft 2g on the right end side of the lead screw 2 is slidably engaged with the groove of the guide plate 1c connected to the chassis right side plate tb and the chassis 1, and the holding portion 10a of the leaf spring IO is The shaft 2g is further engaged with a cam groove of a cam groove plate 50a rotatably supported by a shaft provided on the guy F plate 1c. S.O.
Interlocking teeth are formed around a, and this and the leaf spring l
By engaging with the ratchet portion 10c of O, the cam groove plate 50a can be latched at a desired rotational position. As a result, the position of @2g that engages with the cam groove is determined in the groove of the guide plate 1c, and therefore the position of the lead screw 2 at the right end of the device is determined. This configuration is used for adjusting the gap between the recording head and the platen, which will be described later.

Reference numeral 4 denotes a clutch gear, which is slidably supported in the axial direction with respect to the lead pulley 3, and is engaged in the rotational direction by a portion of the key provided on the lead pulley 3, which will be described later in FIG. Power is transmitted 20 times. Reference numeral 5 denotes a clutch spring, which is a compression spring that biases the clutch gear 4 in the direction of the lead groove. Note that a regulating member is formed between the clutch gear 4 and the reload pulley 3 to prevent the clutch gear 4 from moving within a predetermined range in the axial direction.

6 is a carrier, which can be slidably accessed by the lead screw 2. 6a is a pressing portion for pressing the end face of the clutch gear 4, and is integrally formed on the left side of the carrier. 7 is a lead bin, and lead screw 2
The lead 7g2a is engaged with the lead 7g2a, and its pressing direction is guided by a guide hole (not shown) in the carrier 6. 8
is a lead bin spring, one end of which is attached to the carrier 6, and the other end of which presses the lead bin 7.

Reference numeral 9 denotes a recording head mounted on the carrier 6, and in the example shown in FIG. It is a disposable type that can be replaced when the ink is consumed. Note that an electrothermal transducer or an electromechanical transducer is used as the ejection energy generating element disposed in the head element 9a to apply ejection energy to the ink, but it is possible to implement high-density mounting of ink ejection ports, etc. Something. The former is preferably used because the manufacturing process is simple.

A hook 6C is fixed to a part of the carrier 6, and as described later, when the carrier 6 moves, the recording head 9
This mechanism is used to stably stop at the cap position, etc.

5l is a carrier guide shaft, which is slidably engaged with a guide bin 6b provided at the rear end of the carrier 6. The guide shaft 5l is an eccentric shaft 5 as described later in FIG.
1a, and these shafts 51a are rotatably supported by side plates 5lb and 51c provided at the ends of the chassis 1. Furthermore, the end of the shaft 51a, which is supported by the side plate Slc, is fixed to a positioning knob 51d, and the shaft 5l is rotated by engaging a projection provided on the knob 51d with a hole 51e provided in the side plate 51c. The location is determined. As shown in FIGS. 4(A) and 4(B), the above-mentioned configuration k allows the distance between the recording surface of the recording paper 40 and the ejection opening of the head element 9a to be set appropriately depending on the type of the recording paper 40. This is for the purpose of That is, by manually rotating the knob 51d, the shaft 5l is moved to the position where the distance between the shaft 51a and the bottle 6b is minimum, as shown in FIG. 4 (8);
As shown in Figure 4 (B), the same distance can be fixed at the position of the furthest dog. Accordingly, the recording head 9 rotates about the lead screw 2 as a rotation axis, and the recording paper 40 is moved to a position corresponding to relatively thin plain paper (see FIG. They are fixed at positions with large intervals (Fig. 4 (B)), which corresponds to the printing paper companies with high standards.However, the above-mentioned configuration is a configuration that corresponds to the recording paper used during recording. , during ejection recovery processing (the recording head 9 is moved to the position of the recovery processing system shown at the left end of FIG. 2. At this time, the recording head 9 and the recovery system must always be in a predetermined positional relationship. Therefore, regardless of the position shown in Figure 4 (^) or (B), during the discharge recovery process (
In this case, the recording head 9 needs to take a fixed position. The configuration for this purpose is shown in FIGS. 5(^) and (B).

Figure 5 (^) and (B) are respectively Figure 4 (A) 1
5 and (B).

In the case of Figure 5 (^), ! Ii! The glaze 51a and the bottle 6b can be engaged without changing the height of the engagement position between the h51 and the bottle 6b. At this time, in order to maintain the height of the engagement position, the parallel portion of the trapezoidal cam 51g is also engaged with the bottle 6b.

In the case of FIG. 5(B), the recording head 9 moves and the bin 6b
When the pin 6b attempts to engage with the shaft 51a, the height of the locking position of the pin 6b changes. Therefore, the shaft 51 has a tapered portion 51.
f is provided, and the trapezoidal cam Slg is provided with a tapered surface in accordance with this. As a result, as the height of the engagement position of the bottle 6b with the shaft 51 (tapered portion 51f, shaft 51a) changes, the height is maintained.

With the above configuration, when the recording head 9 reaches the position of the ejection recovery system, it is possible to always maintain a predetermined height and therefore a predetermined positional relationship with the recovery system. Note that the rotationally fixed position of the recording head 9 is 2 as described above.
The present invention is not limited to this, and it is also possible to fix it at an intermediate position to accommodate recording paper of various thicknesses. In this case, the protrusion of the knob 51d and the hole 51e of the side plate 51c
All you have to do is increase the number of engagement positions.

Furthermore, the rotation of the knob 51d is not limited to manual operation; for example, the knob 51d may be rotated using the driving force of a paper feed motor or the like in accordance with the key manual power corresponding to the recording paper used.

Referring again to FIG. 2, 1l is a carrier motor made of, for example, a pulse motor, and rotating bins 11a are provided in alignment at the lower part of the front and rear surfaces of the carrier motor 11. 11a (the one on the rear side is not shown) is rotatably attached to a motor attachment hole provided in a recovery system base 50 that is movable on the chassis 1. Of course, the rotating bin may be provided on the recovery system base 50 and the mounting hole may be attached to the motor side. The carrier motor 11 is rotatably mounted around a rotation pin lla, and llb is a spring receiver formed integrally with the carrier motor 11.
It is erected parallel to the motor shaft to receive a motor spring l4, which will be described later. A cylindrical projection is formed in the spring receiving portion, and an end portion of a coiled motor spring l4 is fixed thereto.

Reference numeral 12 indicates a motor pulley, which is fixed to the motor shaft of the carrier motor 1l. Reference numeral 13 indicates a timing belt, which is stretched between the motor pulley l2 and a pulley 3a provided on the shaft of the lead screw 2. Motor spring l4 is a compression spring in the configuration of this example, and lead arm 1
It is attached between one end of the carrier motor 1l and the spring receiver lb of the carrier motor 11, thereby urging the carrier motor 1l in the direction A in the figure and applying tension to the timing belt 13. Reference numeral 15 denotes a set shaft, which is erected on a side plate (not shown) fixed to the base 50, to which means for improving the discharge port formation surface, a cap, and a so-called recovery system mechanism related to discharge recovery are attached. By the way, as mentioned above, the positional relationship between this recovery system mechanism and the recording head 9 is important.
For example, the positional relationship with the ejection orifice surface is important for the blade to perform its function of wiping the ejection orifice surface of the recording head 9 well. The distance between the discharge port surface and the discharge port surface is important. Therefore, it is desirable that the positional relationship between these recovery system mechanisms and the recording head 9 is always kept constant. On the other hand, the recording head 9 is driven by the lead screw 2 due to the driving force being transmitted through the lead screw 2.
Record while moving along the At this time, recording paper 4
It is clear that it is desirable that the distance between the recording head 9 and the ejection opening of the recording head 9 be the same at any position of movement. Therefore, it is possible to provide an adjustment mechanism that adjusts the distance between the recording head 9 and the recording paper so that the recording head can move parallel to the recording paper, but this adjustment requires a certain positional relationship with the recovery system. It may also be damaged. Therefore, in this embodiment, the carrier motor l1 and the recovery system base 50 provided with a recovery system mechanism which will be described in detail later are made movable with respect to the chassis 1.

By this movement of the base 50 and the adjustment by the cam plate 50a described above, the position of the lead screw 2 is adjusted at both ends, so that the recording head 9 moves parallel to the recording paper 40. The details of the mechanism in the hair head 50 for this purpose are shown in FIG.

FIG. 6 is a perspective view of the recovery system base 50 from the opposite direction from FIG. 2, and is shown in a partially cutaway view.

In the figure, SOe is a guide groove member fixed to the side surface of a groove provided on the back side of the base 50, and this
groove, and a key-shaped guide member 1k fixed to the chassis 1.
By engaging with the guide portion of the base 50, the direction of movement of the base 50 is regulated and the base 50 can be prevented from floating up from the chassis 1. In the above mechanism, as shown in detail in FIG. 2, by rotating the cam plate 50b around the shaft SOd attached to the base 50, the cam surface is aligned with either one of the cam grooves IJZ of the chassis 1. Press the surface while bringing it into contact with the surface. At this time, the base 50 moves in the direction guided by the member 50e and the member 1k due to the reaction force of the pressing force.

Note that the above cam structure may be such that the cam plate is rotated around a predetermined axis by operating a shaft that engages with a predetermined cam groove formed in the cam plate. Along with this movement, the carrier motor 11 attached to the base 50 and the drive system for driving the motor 11, that is, the timing belt 13, the booster 3.12, the lead hook L-2, etc., and the base 50 as well. The position of one end of the lead screw 2 is adjusted while the recovery system mechanism attached to the lead screw 2 moves together.

On the other hand, the position of the other end of the lead screw 2 is adjusted by rotating the cam groove plate 50a. With the above adjustment, the lead screw 2 can be made parallel to the recording paper, and the recording head can therefore move parallel to the recording paper.This adjustment is performed by an assembly robot during the manufacturing process of the recording device. However, this adjustment may also be made on the user side, for example, during repair or the like after using the device for a long period of time.

Next, referring to FIG. 2 and FIGS. 7 (8) to (C), a means for improving the discharge port forming surface, which is one of the recovery system mechanisms, will be explained. 16 is a blade lever (see Fig. 7 (^)), a boss portion 16a is rotatably attached to the set shaft I5, 16b is an arm portion, and 16c is a hook portion.
7 is a blade for wiping the discharge port forming surface, and can be made of an elastic material such as silicone rubber or chloroprene (CR) rubber. 18 is a blade shaft, and the blade 17 is aligned parallel to the rotation axis at the center. It is crunched with
It is rotatably attached to the blade lever 16.

Further, 18a is a rotating piece, which is formed integrally with the blade shaft 18. 19 is an ink carrier, which is made of a hydrophilic porous material (plastic sintered body, urethane foam, etc.). It is fixed to the blade lever 16. In addition, the blade l7 and the ink carrier l
9 is placed at a position overlapping the cap described later. 20 is a set lever, which is attached to the set @l5 so that it can be rotated freely. 20a and 20b are stop teeth provided on the set lever 20. 20C is the same start tooth, 20d
are also rotating teeth, and the tooth thickness of the Start i20c is about half that of the others. Reference numeral 20e denotes an arm part, and by cutting a part of it in the thickness direction, a set surface 20f and a reset surface 20g are formed, and the blade lever 1
The rotary piece 18a of the blade shaft 18 attached to the blade shaft 6 is fitted and combined to drive the rotary piece 18a. 2l is a timing gear, which is rotatably attached to the base 5G by a support member (not shown).

The timing gear 2l has stop teeth 20a, 2 of the set lever 20 described above on a part of the outer periphery of the toothpick shown in FIG. 7(B).
A stop cam 21a is formed for engaging 0b. In addition, three types of drive teeth 211++ with some missing teeth,
2lb2, 211)3 is formed, and a cap cam 21c for swinging a cap lever, which will be described later.
is shaped in a predetermined position. In addition, a piston set cam 21 for pressing the piston of the bomb, which will be described later.
f is formed as a face cam, and a piston reset cam 21g is formed integrally with the piston set cam 21f at a correspondingly predetermined interval.

Reference numeral 22 denotes an ink absorber spring, which is fixed at a predetermined position on the base 50, and as shown in FIG.
2b. 23 is an ink absorber, which is made of a hydrophilic porous material like the ink carrier 19 described above. This ink absorber 23 is formed with a wiping portion 23a on which the blade l7 described above comes into contact, and furthermore, an absorbing surface 23b is formed in the lower part, on which the ink carrier l9 mentioned above comes into contact and transfers ink. ing. The absorber holding portion of the ink absorbing rest spring z2 is biased upward with some elastic force, and is locked in a predetermined position by a stopper (not shown). Therefore,
When the ink carrier 19 mentioned above comes into contact, the ink absorber 23 deflects the ink absorbing rest spring 22 and is displaced downward, thereby ensuring a state of contact.

Next, the recovery system unit, which is one of the recovery system mechanisms, will be described mainly with reference to FIGS. 8 and 9.

In FIGS. 8 and 9, 24 is a cylinder;
It has a cylindrical cylinder part 24a and a guide part 24b that guides a piston shaft, which will be described later.
b has an ink flow path 24 by cutting out a part in the axial direction.
c is formed. 24d is a cap lever receiver, which is formed so that a lever seal, which will be described later, is fitted therein. Further, 24e is an ink flow path, and the cylinder portion 2
It opens at a predetermined position within 4a. Reference numeral 24f denotes a rotating lever, which is formed integrally with the cylinder 24, and is provided with rotating force by the spring portion 22b of the ink absorber spring 22 described above. A waste ink pipe 24g is formed integrally with the cylinder 24, and its tip is cut into an acute angle so that it can be easily inserted into a waste ink absorber to be described later. 24b is an ink flow path formed within the waste ink pipe 24g.

25 is a cylinder cap, which is pressed onto the end of the cylinder 24. 25a is a lever guide, which is arranged at a position facing the cap lever receiver 24d of the cylinder 24 mentioned above.

A piston seal 26 is fitted into the cylinder 24, and its inner diameter is made slightly smaller so as to obtain a predetermined pressure contact with the piston shaft, which will be described later. Further, the sliding force of the piston shaft may be reduced by applying a lubricating coating to the surface.

27 is a piston shaft, and operation shafts 27a. Piston presser 27b. A piston receiver 27c, a connecting shaft 27d, and a guide shaft 27e are formed, and a groove 27f serving as an ink flow path is formed along the connecting shaft 27d and the guide shaft 27e. 27g is a rotation stopper, and the movement axis 2
7a as a groove. Further, a bearing portion 27h is provided on the end surface of the operating shaft 27a.

28 is a piston, and the main body forming the inner layer when viewed from the cylinder sliding part side is formed of an elastic porous material. This includes foams with single pores (such as sponges) and porous bodies with continuous pores such as continuous microporous materials, but continuous microporous materials such as open-cell foamed urethane foam are preferable. Can be formed. Further, a plurality of continuous pores may exist in a direction crossing the direction of elastic deformation.

The outer diameter thereof is formed to be larger than the inner diameter of the cylinder 24 by a predetermined amount, and when inserted into the cylinder 24, it is in an appropriately compressed state. Also, an end surface 28b that comes into contact with the outer periphery 28a and the piston retainer 27b of the piston shaft 27
is positioned so that the solid layer (skin@) during foam molding of the piston is positioned.

Here, even if the member forming the piston body is foamed and communicated, the skin film does not communicate with liquid and maintains airtightness, so the piston 28 fulfills its function. In addition, as long as it does not have a skin film, a film for maintaining airtightness may be separately provided.

42 is a bomb chamber. 29 is a piston pressing roller, which is attached to the end of the piston shaft 27 so as to be rotatable. 30 is a piston return roller, and similarly the piston @
The rollers 27 are rotatably attached to the ends thereof, and 31 is the shaft of these rollers.

32 is a cap lever, and a rotating shaft 32a, an ink guide 32b, and a lever guide 32c are formed. In addition, the tip has a convex spherical sealing surface 32d.
is formed. Further, an engaging portion 32e for engaging with a claw of a cap holder, which will be described later, is provided as a pair of upper and lower members. Further, the ink flow path 32f passes through the inside of the lever from the sealing surface 32d, curves at a right angle midway through, passes through the center of the ink guide 32b, and opens at the end surface thereof. Note that a cutout 32g is provided on the lower side of the ink guide 32b.

Reference numeral 33 denotes a lever seal, into which the ink guide 32b is fitted and which is press-fitted into the cap lever receiver 24d. 33a is a communication hole, which communicates the notch 323 of the ink guide 32b with the ink flow path 24c. 34 is a cap holder, and a hook 34a that engages with the engaging portion 32e of the cap lever 32 is provided at a position facing the cap holder. 34b is an opening for attaching a cap, which will be described later.

Reference numeral 35 denotes a cap, and a cap portion 35a is formed which serves as both a sealing cap for preventing normal ink from drying and a suction cap for sucking ink. A suction port 35b is formed in the cap 35a and opens toward the cap holder 34 through the center of the cap 35.

Reference numeral 35c is a flange portion, which prevents the cap from coming off when attached to the cap holder 34. Further, a concave spherical cap seal portion 35d having the same curvature as the sealing surface 32d of the cap lever 32 is formed on the flange portion 35c, and when pressed against the cap lever 32, only the central opening is closed. It is designed to communicate and the others are sealed. In addition, since the seal portions (32d, 35d) are spherical, the cap member has an excellent coordinating function, and even if there is a step on the discharge port forming surface, the step is immediately absorbed to maintain a stable sealed state. can be kept.

Now, referring again to FIG. 2, 36 is a paper feed roller for conveying a recording medium such as paper, and is made by applying an elastic paint (urethane resin, acrylic resin, etc.) to the surface of, for example, a drawn aluminum tube. It can be formed by Also,
The roller 36 functions on its outer surface as a platen that regulates the recording surface of the recording medium, and its interior serves as a storage section for waste ink. Reference numeral 37 denotes a waste ink absorbing section provided inside the roller 36, which is constructed by filling a thin tube made of plastic such as vinyl chloride with an absorbing material such as polyester cotton so that it can absorb ink well in the axial direction. Note that the waste ink pipe 24g of the cylinder 24 is inserted into the waste ink absorbing portion 37, but even if the recovery system mechanism moves with the movement of the base 50, the inside of the absorbing portion 37 should be kept to an extent that does not impede the movement. Supported by Further, the fibers of the absorbent material themselves are preferably made of a non-liquid-absorbing material such as a compatible resin or metal, but may be slightly absorbent.

38 is fluorocarbon resin. This is a paper press plate made of carbon fiber-containing material or the like, and is divided into four parts and attached to the chassis 1, as detailed in FIG. Further, a gear 38B is fixed to one end of @38A for releasing the pressing force of the paper press plate 38, and the other end engages with a bearing 38C that supports the shaft 38^. The bearing 38c is fixed to the chassis 1. Note that the gear portion of the release lever meshes with the gear 38B, but is not shown here. Reference numeral 39 denotes a paper feed motor, which is connected to the paper feed roller 36 via a speed reduction mechanism with a predetermined ratio.

40 is paper. Recording paper such as film.

Next, the operation of the above configuration will be explained.

First, during normal recording operation, the rotation of the shaft of the carrier motor 11 causes the lead screw 2 to rotate via the tie belt 13, so that it engages with the lead groove 28 and -
The carrier 6 is written in the printing digit direction by the doping pin 7 #i paper 40
scanned along. Here, since the carrier motor I1 is urged by the motor spring l4, the timing belt l3 is always tensioned and good transmission is achieved.

When moving the carrier 6, an inertial force acts upon starting and stopping, but since the weight of the carrier motor 11 absorbs this inertial force, the load applied to the motor spring l4 can be reduced.
The load applied to the rotation of the motor can also be reduced. Further, if an air damper or a hydraulic damper is provided in connection with this spring, noise caused by vibration of the rotor of the motor l1 when the carrier 6 is started or stopped can be reduced. By appropriately selecting the weight of the motor, the weight of the carrier portion, and the coefficient of the motor spring damper, overshoot of the rotor can be reduced and noise can be reduced.

Next, the operation of this embodiment during non-recording will be explained with reference to FIGS. 10 to 16.

FIG. 10 is a timing chart showing the operation timing of each part, and the operation timing of each part as shown can be determined by the number of pulses applied to the motor l1.

FIG. 11 is a perspective view that does not show the detailed structure of the clutch gear 4 and the timing gear 2l described above.
By engaging with h, it slides on the lead screw 2 and rotates together.

Further, the clutch gear 4 is biased toward the carrier 6 by a spring 5, and is normally kept at a predetermined position by the lead screw 2 12i during recording and rotates together with the lead screw 2. When the recording head 9 moves to the home position, the clutch gear 4 is pushed by the carrier 6 and starts to engage with the timing gear 2l.

The clutch gear 4 has a start i 4 c I and a normal drive tooth 4c2, and a start tooth 4cl and a drive tooth 4c2.
It is formed at a different position in the width direction of the clutch gear.
Further, the driving teeth 4c2 are not formed in the same manner all around the gear, and a portion thereof has a curved surface portion 4b. Furthermore, a collar 4a is formed at the end of the clutch gear 4 over the entire circumference.As shown in FIG. 7(B), the timing gear 21 has a start tooth 2lb+. Kind of!
! 1! hi2xb,, 21bs, these teeth 2l
b+, 2lb2. 21bs are formed at different positions in the width direction of the gear 2l. Figure 12 (^) - (C). and Figure 13 (^).
(B) is a diagram showing the engaged state of the clutch gear 4 and the timing gear 21, respectively.

During normal recording, Figures 12 (^) and 13 (^)
) is in a cohesive state as shown in However, at this time, the first
In Figure 3 (^), the lead bin 7 is not in this position,
Although not shown, a blade l7 and an ink carrier 19 are located above the ink absorber 23. At this time, the clutch gear 4 rotates as the lead screw 2 rotates, but the position is not such that the start @4c+ and the start tooth 2lb+ engage (Fig. 13 (^)
reference). For this reason, the tie ring gear 2l does not rotate, and moreover, the driving gear i21b2 and the collar 21h at the left end of the timing gear 21 are in a positional relationship that allows them to come into contact with the collar 4a of the clutch gear 4 with a slight gap. Timing gear 21 cannot rotate in either direction.

As a result, even if some rotational force or artificial force is applied to the timing gear 21, it will not rotate unexpectedly, and errors in the operating position of the recovery system mechanism can be prevented. can.

When the recording head 9 moves toward the home position and the carrier 6 pushes the clutch gear 4, the positional relationship between the clutch gear 4 and the timing gear 21 is finally as shown in FIG. 13(B).
It becomes as shown in . In this process, the start tooth 4c. and 2
lb, is in a positional relationship that allows engagement (however, at this time, the lead bin 7 is not yet in this position). Next, as the lead bin 7 moves from the groove 3C to the groove 3b, the clutch gear 4 rotates clockwise in FIG. ) changes sequentially to the states shown below. At this time, start tooth 4c
Until l and 2lb+ are engaged, the supporting part 4b as a non-meshing part shown in the diagram is in the position closest to and facing the timing gear 2l, so the timing gear may be inadvertently moves and the other drive teeth do not engage each other first.

As a result, the gear engagement between the clutch gear 4 and the timing gear 2l always starts with the start teeth starting from each other, so that the rotation of the timing gear 2l always starts from the correct position.

As a result, the operation of the recovery system mechanism driven via the timing gear 2l becomes accurate.

Further, there are advantages such as there being no need to increase the mounting accuracy of the clutch gear 4 and the timing gear 2l so much.

In addition, as shown in FIG. 7(B), the timing gear 21
Of the drive teeth, the drive tooth 21b3 whose position is different is the drive tooth that engages when the curved surface portion 4b comes into contact with the tying gear 2l again. In other words, the drive tooth 21b3 that changes its position is the drive tooth that engages when the curved surface portion 4b comes into contact with the tying gear 2l again.
If these driving teeth are located at the same position as 1b2, the curved surface portion 4b
Since the drive teeth come into contact with each other, the drive teeth are moved to engage each other.

Further, while the driving teeth are engaged and the timing gear 2l is rotating, the hook 6 attached to the carrier 6 is
C slides on the side surface of the timing gear 21.

This can prevent the recording head 9 from moving away from the home position due to the lead bin 7 filling the groove 3b, for example, before predetermined teeth engage with each other. This is because the lead screw rotates twice when the recording head 9 is at the home position and performs a series of recovery processes, so the lead bin 7 may move to the groove 3C. In addition, in the above example, the series of recovery processing is performed using the lead screw 2.
Although the rotation is performed in this example, the rotation is not limited to this, and any rotation can be set, thereby increasing the degree of freedom in designing the clutch mechanism, etc. FIGS. 14(^) to (D) are explanatory diagrams showing the sequential operating states of the mechanism related to the blade 17, etc., and FIGS. 15(A) to (C)
16(8) and 16(B) are explanatory diagrams showing the sequential operating states of the mechanism related to the cap 35, and FIGS.
FIG. 12 is an explanatory diagram for explaining the operation of a mechanism for introducing waste ink into the waste ink storage section 37 in 6, and the operation will be explained with reference to these figures and the above-mentioned FIGS. 12 and 13.

First, the carrier 6 moves toward the home position (in the direction of arrow B). At this time, as shown in Figure 13 (^), the lead bin 7 is engaged with the lead groove 28, and the ejection 09C of the head element 9a is at a position facing the ink carrier 19 (see Figure 14 (^)). It is in. At this position, all of the ejection energy generating elements of the head element 9a are driven to perform an ejection operation (hereinafter referred to as preliminary ejection), and the slightly thickened ink is ejected with the ejection force.
This preliminary ejection recovery operation can be completed. Preliminary ejection is also performed at this position, which is periodically performed to prevent the ink in unused ejection ports from increasing in viscosity during normal printing. Note that FIG. 14(A) is a side view of the vicinity of the same position.

Furthermore, as shown in FIG. 13(B), when the lead screw 2 is rotated to move the carrier 6 in eight directions,
The clutch gear 4 is pressed by the pressing part 6a, and the
direction, and the start i4c is at a position where it can engage with the start tooth 2lb of the timing gear 2l. After that, the clutch gear 4 rotates in synchronization with the lead screw 2, and the start teeth engage with each other, causing the timing gear 2 to rotate.
1 rotates in the D direction as shown in Figure 14 (CB). On the other hand, the lead pin 7 is inserted into the position groove 3 from the introduction i3c.
b, the carrier 6 does not move even if the lead screw 2 rotates. When the tie gear 21 rotates in the D direction, its gear portion and the gear portion of the set lever 20 are engaged, so the set lever 20 begins to rotate in the E direction. Up until this point, the hook portion 16c of the blade lever 16 is engaged with the claw portion of the chassis, so only the set lever 20 rotates.
The blade lever 16 is stopped, but eventually the set surface 20f of the set lever 20 rotates in the F direction while pushing down the rotating piece 18a of the blade shaft 18, so the blade l7 rotates in the G direction and closes the discharge port. set in a state capable of engaging with a surface.

When the timing gear 21 further rotates in the D direction, the hook portion l6 of the blade lever 16 comes off the pawl of the chassis, and the set lever 20 and blade lever 16 also rotate further, and as shown in FIG. 14(C), the blade l7 Wipe the discharge port surface of the head 9. At this time, the ink liquid etc. removed by wiping the plate 17 is removed only in one direction, that is, only downward in this case, and this expelled ink liquid etc. is absorbed or retained in the upper part of the ink carrier 19. Also, at this time, the ink carrier 19 begins to come into contact with the ink absorber 23. When the set lever 20 further rotates, the ink carrier 19 and the blade 17 slide on the surface of the wiping part 23a of the ink absorber 23, as shown in FIG. Ink received by the wiping section 2 and dust wiped by the blade l7 from the ejection orifice forming surface are removed from the cleaning section 2.
3a, and the ink droplets adhering to the ejection port surface are also absorbed. Thereby, the ink absorbing ability of the ink carrier 19 can be maintained for a long period of time.

Furthermore, although the timing gear 2l rotates in the D direction, the rotation of the set lever 20 is restricted because the stops i20a, 20b of the set lever 20 and the stop cam 21a of the timing gear 2l face each other and come into contact with each other. At the same time, since the driving teeth of the timing gear 21 are missing teeth, the force for rotating the gear does not work. As mentioned above, since the blade and the absorber that holds the ink liquid etc. removed by the blade are the same as the ink receiver during preliminary ejection, the device can be made smaller and the time required for these recovery operations can be shortened. can. When the timing gear 21 rotates further, the cap cam 21c of the timing gear 2l initially regulates the rotating shaft 32a of the cap lever 32c shown in FIG. The constant cap 35 is stopped at a position away from the discharge port surface of the head element 9a. Next, when the tying gear 21 further rotates in the D direction, it comes off from the cap cam 21c and the regulating state is released, so as shown in FIG. 15(B), the rotary lever 24f of the cylinder 24 is The cylinder 24 is biased by the spring portion 22b of the absorber spring 2z, rotates in the F direction, and the cap portion 35a of the cap 35 comes into pressure contact with the discharge port surface, thus completing the capping operation. In addition, Fig. 13 (
B) shows a top view at this time. At this time, the seal member 32d and the cap seal portion 35d are also tightly sealed due to the pressing force of the cap.

Now, the above is the cleaning and capping operation of the nozzle surface, and normally the nozzle surface is cleaned and the cap operation is stopped here, and the above operation is performed in reverse according to the human power of the next recording signal, and then the recording operation is started.

Next, a suction recovery operation that is performed when the ejection condition is not improved even after preliminary ejection will be described.

When starting this, the timing gear 21 is further rotated from the cap position, and the cap lever 32 is pressed by the cap cam 21f, as shown in Fig. 15(C).
As shown, the cap 35 is slightly spaced apart from the discharge port forming surface.

When the timing gear 2l further rotates in the D direction, it comes off the cap cam 21f again, so the cap portion 35a
comes into pressure contact with the discharge port surface.

Now, regarding the bombing operation, when the recovery operation is started after the above-mentioned sealing cap is completed, the suction operation is started.

At this time, first, due to the rotation of the timing gear 21, the piston set cam 21g pushes the piston pressing roller 29 attached to the piston shaft 27, so the piston shaft 27
moves in the H direction as shown in Figure 16 (^). The piston 28 is then moved in the H direction by being pressed by the piston holder 27b, and the bomb chamber 42 is brought into a negative pressure state. Since there is a skin layer on the outer periphery of the piston 2a and the contact surface with the piston holder 27b, ink will not leak through the communication hole of the foam material.

Further, the ink flow path 24e of the cylinder 24 is connected to the piston 28.
Since the piston 28 is closed, the piston 28 is in a movable state only by increasing the negative pressure in the pump chamber 42. on the other hand,
As shown in FIG. 16 (8) after the above-mentioned re-capping, the ink flow path 24e is opened, so that the ink in the head 9 is sucked through the suction port 35b of the cap 35. The sucked ink passes through an ink flow path 32f formed inside the cap lever 32, and passes through the i! of the lever seal 33. The ink flows into the bomb chamber 42 through the Iu through hole and further through the ink flow path 24e of the cylinder 24.

When the timing gear 2l further rotates, the cap cam 21h again causes the key 7 tab 35 to move slightly away from the discharge port surface, and due to the residual negative pressure in the bomb chamber, the discharge port surface and the cap portion 35
The ink inside a is suctioned to eliminate any remaining ink in these areas.

Next, when the timing gear 2I is rotated in the opposite direction (the direction indicated by the arrow I in FIG. 14(D)), the piston reset cam 21f pulls the piston return roller 30, and the first
Move the vist shaft 27 in the direction of arrow J as shown in Figure 6 (B). ．． At this time, the piston 28 is moved along the piston axis z
Since the piston receiver 27c of No. 7 moves after coming into contact with each other, a gap ΔA is created between the end surface 28b of the piston 28 and the piston retainer 27b.

As a result of the movement of the piston shaft 27 and the piston 28, the waste ink sucked into the bib chamber 42 passes through the above-mentioned gap and passes through the groove 27f of the piston shaft.
The ink passes through the ink flow path 24c of the cylinder 24, and further passes through the waste ink pipe 24g, and is discharged near the center of the waste ink absorber 37. At this time, since the ink flow path 24e of the operation initialization cylinder 24 of the piston 28 is closed by the piston 28, waste ink will not flow back toward the cap.

FIG. 17 collectively shows the sequence of the preliminary ejection or suction recovery described above. However, in the figure, the blade l
7 is in a state where wiping is possible (set state. Fig. 14 (B
)), and after wiping, the blade 17 is tilted with respect to the absorber 23 (reset state. Fig. 14 (
^)), and then the blade 17 is brought into a set state in which wiping is possible immediately before the set lever 20 returns to its original position.

Next, with reference to FIGS. 3(^) and 3(B), the recording paper transport mechanism from recording to paper ejection in the apparatus of the wooden embodiment will be described.

In these figures, 38 is a fluorine resin as mentioned above. This is a paper press plate made of a material mixed with carbon fiber or the like, and applies a pressing force to the fed recording paper so that there is a predetermined distance between the ejection port surface of the recording head 9 and the recording paper.

The pressing force of this pressing plate 38 is due to the elastic force of the spring plate 38D. Details of this mechanism are shown in FIGS. 18(A) and 18(B).

FIG. 18(^) is a diagram showing a state in which the paper presser plate 38 is applying a pressing force to the paper feed roller. In this case, the spring plate 38 has a D-shape in which a part of the circumference is linearly cut out, and the notch part of the shaft 38A that can slide in the rotation direction with respect to the paper press plate 38 is connected to the spring plate 38.
At this time, the end 38E of the paper press plate receives a biasing force upward in the figure by the spring plate 38D. As a result, the paper presser plate 38 attempts to rotate clockwise around the shaft 38^, applying a pressing force to the paper feed roller 36.

On the other hand, FIG. 18 (8) shows a state in which the pressing force exerted by the paper pressing plate 38 is released. In this case, the shaft 38A rotates and the arc portion @38^ presses the end portion 38F. At this time, the entire spring plate 38D is pushed down in the figure. As a result, the end portion 38ε does not receive any biasing force from the spring plate 38D.

When this biasing force is released, the shaft 38A and the paper press plate 38 are engaged with each other with a certain amount of frictional force, so the paper press plate 38 does not change its rotational position significantly. As a result, even when it becomes necessary to release the pressing force of the paper presser plate 38, the paper presser plate does not interfere with the movement of the recording head. Further, the paper pressing mechanism described above is a mechanism capable of applying a pressing force that does not prevent the paper feed roller 36 from properly conveying the recording paper within a limited space. In other words, without using an elastic member in the paper press plate itself,
The pressing force is normally applied to the bottom chassis 1 of the device, which is a dead space.
Since the force is generated by a leaf spring arranged along the top, the degree of freedom in setting the pressing force can be increased by adjusting the length of the leaf spring, and the paper pressing member can be made smaller.

Note that the leaf spring 38D is attached to the chassis 1 by a fixing member (not shown).

Referring again to FIGS. 3(8) and (B), 60 is a paper ejecting roller for ejecting the recorded recording paper, and 61 is a paper ejecting roller that applies pressing force to the recording paper conveyed by the paper ejecting roller 60 to perform recording. This is a spur that regulates the direction of paper discharge and generates conveying force.

Reference numeral 62 denotes a transmission roller that is disposed at an intermediate portion between the paper ejection roller 60 and the paper feed roller 36 and transmits the rotation of the paper feed roller 36 to the paper ejection roller 60. These rotations are transmitted by frictional force caused by mutual contact.

The paper ejection roller 60 has a cylindrical shape with different radii at both ends and a middle part, and the transmission roller 62 contacts the middle part of the paper ejection roller 60 with a smaller diameter. Therefore, both ends of the recording paper with the larger diameter, which carry the recording paper, rotate at a slightly higher circumferential speed than the circumferential speed of the paper feed roller 36. As a result,
When the recording paper is ejected, the recording paper is conveyed with great force, so that a good recording surface can be formed.

Note that coil springs having appropriate elastic coefficients are used for the rotation shafts of the transmission roller 62 and the spur 6l, respectively. The details of the mechanism will be explained using the spur 61 as an example with reference to FIG. 19.

In FIG. 19, 6l^ is a shaft extending from the coil spring through the center of the spur 61 and on both sides thereof, and engages with the spur 61 so as to rotate freely. Reference numeral 103B is a shaft supporting member that pivotally supports both ends of the rotating shaft 6l^, and is formed as a part of the inner lid 103 shown in FIG. Axial support material 10
3B supports the shaft 61A slidably in the axial direction;
103G is a regulating member for regulating the movement of the spur 61 in the direction of the rotation axis and in a direction perpendicular thereto;
installed on both sides of the The regulating member 103C is also the shaft supporting member 10.
Like 3B, it is formed as a part of the inner lid 103. With the above configuration, the shaft 6l^ not only supports the spur 6l, but also obtains a pressing force of the spur 6l against the paper ejection roller 60 by its bending elastic force. The inner ii 103 has a spring member 103^ at its rear end, as shown in FIG.

The spur 6l applies an appropriate pressing force to the discharge roller 60 by the interaction of this pressing force and the elastic force of the rotation Iith6l^.

In addition, as the inner M103 receives the above-mentioned pressing force, the fixing member 103 of the inner M103 as shown in FIG.
The engagement between D and the rotation @60C of the paper ejection roller 60 is ensured. As a result, the positional relationship a between the spur 61 and the paper discharge roller 60 is always kept constant. Alternatively, by fixing the rotating shaft 60G against a hooking member or the like, a precise relationship can be maintained regardless of the precision of the inner cover.

In the transmission roller 62, the rotary shaft 62^ made of a coil spring has the same function, and the elastic force of the shaft 62^ provides a contact force to the paper feed roller 36 and the paper discharge roller 60.

As described above, the paper ejection roller δ0 has a shape in which the diameter of the intermediate portion is smaller than that of both ends. The details of this configuration are explained in the 20th
As shown in the figure.

In FIG. 20, 60^ is a cover member made of a rubber material, and 600 is a cylindrical core member whose diameter is smaller at the middle part than at both ends. The paper discharge roller 60 is formed by covering the core member 600 with a pipe-shaped cover member 60A.

As a result, it is not necessary to integrally mold such a shape with a rubber member or the like, and the paper ejection roller can be obtained relatively easily and at low cost.

Note that the groove BOB that is continuously provided at one end of the paper ejection roller 60 can catch the end of the recording paper when it is ejected by the paper ejection roller 60, and prevents the recording paper from being misaligned. This makes it possible to ensure that the paper is ejected reliably.

Note that the shape of the core member 600 is not limited to the above, and for example, it may be a shape that is an extension of the shape of the groove portion 60B with a smaller intermediate portion, or a cylindrical shape may be obtained by covering with a rubber material.

Next, the case where the wood-based inkjet recording apparatus is used in an upright position will be explained with reference to FIGS. 21 and 22. When the apparatus is used in an upright position, as shown in these figures, an auto feeder 200 and C are used together, or thick paper such as envelopes is fed from the paper feed port on the back side of the apparatus.

In the case of normal recording paper that uses an auto feeder, the upper M102 can be used as a stacker for the discharged recording paper. At this time, as shown in FIG.
Fix it at a different angle than when using it as a paper guide for feeding paper. When using the upper M102 as a stacker, the conditions are as follows. That is, the ejected recording paper is transported through the air to some extent by its own strain strength, and first comes into contact with the upper C, il02, or the already stacked recording paper. The position is the upper end 10 of the upper lid 102.
Make it close to 2^. This allows the ejected recording paper to slide over the already stacked recording paper, etc. only at the leading edge of the recording paper, thereby avoiding sliding as much as possible and preventing stains on the recording paper from unfixed ink. It can be prevented. The configuration for this purpose requires that the upper end 102A be located near the common tangent line of the paper feed roller 36 and the paper ejection roller 60 in the paper ejection direction, that is, in the case of a wooden example, and that the lower end 102B be lowered. Become.

Further, when the trailing edge of the recording paper that has stopped on the upper end portion 102^ is completely discharged, it is lowered at that position and stacked without sliding.

For this configuration, the length of the upper M 102 in the paper ejection direction (the length from the upper end 102A to the lower @ 102B) is a requirement. When the paper is ejected, its length is 60% to 90%, more preferably 70% to 80%, of the length of the recording paper. Note that if the configuration of the recording device or usage conditions are different and the paper ejection direction is different from the above, the length of the stacker may be determined while taking the first requirement above into consideration. Further, numeral 108 shown in FIGS. 21 and 22 is a roll-in prevention piece that can prevent stacked recording sheets from entering the paper feed port 10B.

(Others) The present invention brings about excellent effects particularly in bubble jet recording heads and recording devices among inkjet recording methods.With such a method, high density and high definition recording can be achieved. This is because it is expected that the fixing speed will be even slower depending on the recording pattern.The typical configuration and principles thereof are described in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796. It is preferable to use the disclosed basic principle.This method is applicable to both so-called on-demand type and continuous type, but especially in the case of on-demand type, liquid ( The electrothermal transducer is placed in correspondence with the sheet holding the ink (ink) and the liquid path.
Generating thermal energy in the electrothermal transducer and producing film boiling on the thermally active surface of the recording head by applying at least one drive signal that corresponds to recorded information and provides a rapid temperature rise above nucleate boiling. As a result, bubbles in the liquid (ink) can be formed in one-to-one correspondence with this drive signal, which is effective. The growth of this bubble. Contraction (discharges the liquid (ink) through the discharge opening to form at least one droplet.If this drive signal is in a pulse shape, bubble growth and contraction will occur immediately and appropriately, so the special C response It is more preferable because it enables ejection of liquid (ink) with excellent properties.As this pulse-shaped drive signal, those described in U.S. Pat. Nos. 4,483,359 and 4,345,262 are suitable. By the way, if the conditions described in US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, recording with excellent roughness can be achieved.

The configuration of the recording head includes ejection ports as disclosed in the above-mentioned specifications. US Pat. No. 4,558,333 discloses a combination structure of a liquid path and an electrothermal converter (straight liquid flow path or right-angled liquid flow path), as well as a structure in which a heat acting part is arranged in a bending region. A configuration using the specification of US Pat. No. 4,459,600 is also included in the present invention. In addition, Japanese Patent Application Laid-Open No. 1989-5 discloses a configuration in which a common slit is used as a discharge part of a plurality of electrothermal converters.
No. 9-123670 and Japanese Patent Application Laid-Open No. 59/1989 which discloses a configuration in which a discharge portion is made to correspond to an opening that absorbs pressure waves of thermal energy.
- The effects of the present invention are also effective even with a configuration based on Publication No. 138461. In other words, regardless of the form of the recording head, recording can be performed reliably and efficiently.

Furthermore, the present invention can also be applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium that can be recorded by a recording apparatus. Such a recording head may have either a configuration in which the length is satisfied by a combination of a plurality of recording heads, or a configuration in which a single recording head is formed integrally. In addition, even serial type recording heads like the one above can be installed in the main body of the device, making it possible to electrically connect to the main body of the device and supply ink from the main body of the device.Replaceable chip-type recording heads Alternatively, the present invention is also effective when using a cartridge type recording head that is provided integrally with the recording head itself.

In addition, regarding the type and number of recording heads installed, for example, in addition to one type that corresponds to single-color ink, there is also a plurality of recording heads that correspond to multiple inks with different recording colors and densities. It may be something that is given. In addition, the inkjet recording apparatus of the present invention can be used as an image output terminal for information processing equipment such as a computer, or as a copying apparatus combined with a reader or the like, or as a facsimile apparatus having a transmitting and receiving function. It may also be one that takes

[Effects of the Invention] As is clear from the above description, according to the present invention, the paper pressing member that directly presses the platen and the means for generating the pressing force thereof are separate, and this means is provided at the bottom of the apparatus. By arranging the paper presser member along the same line, the paper presser member can be made smaller and does not require a special space for the above-mentioned means.

Further, the pressing force on the paper pressing member is only released, and for example, when the recording medium is pulled out from between the paper pressing member and the platen, the pressing force of the paper pressing member on the platen is released. In this case, the paper holding member will not change its position significantly. As a result, the device can be made smaller, and
It is possible to prevent interference with the recording head and the like due to the release of the pressing force of the paper pressing member against the platen.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an example of an inkjet recording device according to the present invention; FIG. 2 is a perspective view showing the main parts of the device shown in FIG. 1 with the cover removed; 3(A) is a perspective view mainly showing the paper ejection system of the apparatus shown in FIG. 1; FIG. 3(B) is a side view of the drawing shown in FIG. 3(A); Figures (A) and (B) are side views showing one embodiment of the recording head corresponding to the recording paper, respectively, and Figures 5 (^) and (B) are the recording at the home position corresponding to the recording paper, respectively. FIG. 6 is a rear view showing an embodiment of the head; FIG. 6 is a partially cutaway perspective view showing an embodiment of the engagement state of the base on which the recovery system mechanism is mounted with the chassis; FIGS. 7 (^) to (C) 8 and 9 are exploded perspective views and sectional views, respectively, of an embodiment of the suction recovery system for the recording head. 11 is a perspective view showing an embodiment of a clutch mechanism for transmitting driving force to a recovery system mechanism; FIGS. 12(A) to (
C) is a side view showing the engagement state of the clutch gear, hook, and timing gear in the clutch mechanism shown in FIG. 11; FIGS. 13(A) and (B) are front views similar to FIG. 12; , FIGS. 14(A) to 14(D) are side views for explaining the sequential operations of the blade and the ink carrier section, and FIG. 15(
A) to (C) are side views for explaining the sequential operation of the cap part, and Figures 16 (^) and (B) are side cross sections for explaining the operation of the kth pump part that performs suction recovery. 17 is a tying chart explaining the sequence during preliminary ejection or suction recovery processing according to this example (some other embodiments), and FIG. 18 (^) and (B) are paper presser plates. FIG. 19 is a side view showing an embodiment of the pressing mechanism; FIG. 19 is a perspective view showing an embodiment of the support state of the spur in the paper ejection system; FIG. 20 is a front view showing an embodiment of the paper ejection roller. , 21st
This figure is a perspective view showing another example of the usage state of the device of this example, and FIG. 22 is a side sectional view of the state shown in FIG. 21. DESCRIPTION OF SYMBOLS 1...Chassis, 2...Lead screw 2a...Lead groove, 3a...Lead bullion, 3b...Position groove, 3C...Introduction groove, 4...Clutch gear, 5... Clutch spring, 6...Carrier, 6c...Hook, 7...Lead bin, 9...Recording head, 9a...Head chip (discharge element), 9b...
・Ink tank part, 9C...Discharge port, 9d...Discharge port forming surface, 1L...Carrier motor, 13...Ticking belt, l5...Set shaft, ■...Blade leper 17 ...Blade, 19...Ink carrier, 20...Set lever 21...Timing gear, 22...Ink absorber spring, 23...Ink absorber, 24...Cylinder, 27... ...Piston shaft, 28...Piston, 29...Piston pressure roller, 32...Cap lever 34...Cap holder, 35...Cap, 35a...Cap part, 38...Paper Feed roller, 37... Waste ink absorber section, 38... Paper press plate, 40... Recording paper, 50... Base, 5l... Guide shaft, 60... Paper discharge roller, 61 ...Spur, 62...Transmission roller, 100...Inkjet 102--Top lid, 103...Inner lid. Fig. 3 (B) Fig. 5 Fig. 4 Fig. 6 Fig. 21o Fig. 13 Fig. 15 Fig. 19

Claims (1)

[Claims] 1) An inkjet recording apparatus that performs recording by discharging ink droplets onto a recording medium, comprising: a platen that regulates the recording surface of the recording medium; and a platen that is provided so as to be able to come into contact with the platen. An inkjet recording characterized by comprising: a paper pressing member; and an elastic member provided along the bottom of the apparatus for urging the paper pressing member and pressing the platen by the contact. Device. 2) The inkjet recording apparatus according to claim 1, further comprising a biasing release means for releasing the biasing force applied to the paper pressing member by the elastic member. 3) The bias release means is a rotatably provided shaft that abuts a part of the elastic member and has a cam-shaped cross section;
3. The inkjet recording apparatus according to claim 2, wherein the urging force is released by rotating the shaft to release the contact between the elastic member and the paper pressing member. 4) The inkjet recording apparatus according to claim 3, wherein the shaft holds the paper pressing member by frictional force. 5) The platen also serves as a paper feed roller, and at least the surface of the roller is made of urethane resin or acrylic resin, and at least the surface of the paper pressing member that contacts the platen is made of fluorine resin or a carbon fiber-containing material. The inkjet recording apparatus according to any one of claims 1 to 4, characterized by: 6) The inkjet recording device according to claim 1, wherein the recording head of the inkjet recording device ejects ink droplets using heat generated by an electrothermal transducer.