JPS6347624B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a liquid jet (inkjet) recording device, particularly an on-demand type liquid jet recording device.

In a liquid jet recording device, the recording head has an ejection channel with a minute liquid (ink) ejecting port (ejection orifice) at the tip to properly form the flying liquid, so it is difficult to stop the device. In many cases, the ink in the ejection channel dries and solidifies, causing the ejection channel to become clogged, ie, so-called clogging. Another disadvantage is that the meniscus formed at the tip of the discharge flow path recedes due to vibrations, shocks, etc. during transportation of the device, resulting in poor printing or inability to print. Furthermore, even during printing, the ejection channel may become clogged with fine fibers from the printing paper, dust in the atmosphere, impurities in the ink, etc., resulting in poor printing or the inability to print. . Therefore, in the past, a negative pressure applying means such as a suction pump or a suction cylinder was connected to the tip of the ejection flow path each time to suck ink and clean the ejection flow path, or an ink-soluble liquid was ejected. A method has been adopted in which droplet ejection is restored by applying the ink to the tip of the flow path and dissolving the solidified ink.

However, in the conventional method, although it is an effective print recovery method when there is ink in the liquid reservoir (ink tank) connected to the recording head, if there is no ink in the liquid reservoir, ink suction There was a drawback that air was sucked into the liquid path inside the recording head during operation, resulting in poor printing or the inability to print. In addition, in the conventional example, excessive suction operation or, in the case of a device having a movable liquid reservoir and a fixed liquid reservoir, clogging of the connection path that communicates the movable liquid reservoir and the fixed liquid reservoir, etc., caused the leakage from the fixed liquid reservoir. In this case, the movable reservoir may be out of ink due to an inability to supply ink or evaporation of ink from the movable reservoir and ink supply path. As a pre-operation, it was necessary to fill the movable liquid reservoir with ink. However, if the ink filling mechanism and the ink suction mechanism for printing recovery are independent, even if printing defects or printing failures occur,
As long as the cause is unknown, it cannot be determined whether to use the ink filling mechanism or the suction mechanism, and if the suction operation is performed incorrectly when there is no ink in the movable liquid reservoir as described above, it may cause printing to become unrecoverable. I was supposed to invite him. Therefore, in order to prevent the above-mentioned problems, in the past, methods such as detecting the amount of ink remaining in movable liquid reservoirs and fixed liquid reservoirs have been devised, but the mechanisms are complex and it is impossible to realize miniaturization and cost reduction. It was hot.

[Objective] An object of the present invention is to solve the conventional problems and provide a liquid jet recording device that can perform good printing.

In other words, when introducing ink into the recording head or recovering printing from the recording head, it is necessary to prevent air from entering the liquid path of the recording head to ensure a stable supply of ink, and to ensure reliable printing from the recording head. It's about measuring recovery.

Another object of the present invention is to simplify, reduce the size, and reduce the cost of a liquid jet recording device.

The liquid jet recording apparatus of the present invention includes a recording head having an orifice for discharging liquid, a first liquid reservoir containing liquid, and a second liquid reservoir communicating with the recording head and storing liquid to be supplied to the recording head. a reservoir, a feeding pipe connecting the first liquid reservoir and the second liquid reservoir, and a cap covering the orifice, and serving as a liquid introduction means, a connection connected to the second liquid reservoir. said second by suctioning through the tube.
This object can be achieved by comprising means for introducing liquid into the reservoir and means for introducing liquid into the recording head by suction through the cap.

[Effect] According to the present invention, by suctioning from the second liquid reservoir and the recording head, the second liquid reservoir is drawn from the first liquid reservoir.
The ink can be introduced into the reservoir and then into the recording head.

Therefore, even if the amount of ink in the second liquid reservoir that communicates with the recording head is less than the predetermined amount, it is possible to introduce a predetermined amount or more of ink into the second liquid reservoir and then release the ink inside the recording head. By introducing ink into the recording head, it is possible to prevent air from entering the recording head and causing printing failure.

Furthermore, even if the recording head becomes unable to eject ink due to receding of the meniscus, inclusion of air bubbles, clogging, etc., the ink discharging inability is canceled by suction and the ink is introduced into the second liquid reservoir and into the recording head. By doing so, a reliable ink supply recovery operation can be performed.

Example The present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram for explaining a first example of a preferred embodiment of the liquid jet recording apparatus of the present invention.

The liquid jet recording apparatus shown in FIG. 1 includes a first liquid reservoir 101 containing a main volume of liquid called ink required for recording, and a first connecting path (feeding pipe) between the liquid reservoir 101 and the liquid jet recording apparatus. a second liquid reservoir 103 connected through 102; a liquid jet recording head 104 integrally constructed with the second liquid reservoir 103;
Liquid introduction means 106 connected to a second connection path (connection pipe) 105 connected to the second liquid reservoir 103
and. The liquid introducing means 106 is a suction means, and the inside of the second liquid reservoir 103 is brought into a reduced pressure state through the connecting pipe 105 by the operation of the suction mechanism. This reduced pressure state is created based on the pressure difference formed between the second liquid reservoir 103 and the liquid introducing means 106 through the connecting pipe 105 by operating the suction mechanism of the liquid introducing means 106. It is. The degree of pressure reduction and the time for maintaining the reduced pressure state are set so that a predetermined amount of liquid is smoothly supplied from the first liquid reservoir 101 to the second liquid reservoir 103 through the feed pipe 102. At the rear of the recording head 104, a supply path is formed as a part of the recording head or joined to the rear end of the recording head to fill the liquid in the second liquid reservoir 103 into the recording head 104. A supply path 107 is provided.
The supply path 107 has a liquid introduction port 108 for supplying liquid to the recording head 104 at the tip of one end, and at least a portion having the introduction port 108 is inside the second liquid reservoir 103. , and the liquid inlet 108 is arranged so as to be located at or near the bottom of the second liquid reservoir 103. This supply path 10
7 may be formed by extending the upstream end of the means for forming the liquid path within the recording head 104;
Further, it may be separately provided in connection with the above-mentioned means. As the material constituting the supply path 107, almost any material can be used as long as it can smoothly supply the liquid and does not cause any unfavorable interaction with the liquid. Among these, tubes made of glass, plastic, etc. are particularly useful in the present invention, and preferably vinylidene chloride, vinylidene fluoride, polyester, polyvinyl chloride, etc. It can be mentioned as something. The liquid introduction means 106 includes
The other end of a connecting pipe 105, which is a flow path between the second liquid reservoir 103, is connected to the upper part in a communicating state, and below the joining position of the connecting pipe 105 is a recording head. A coupling means (cap) 110 is provided at the tip of the cap 104 to connect with a discharge orifice 109 for forming flying droplets and to receive the liquid discharged from the orifice 109. The cap 110 is formed of a hollow tube and is linked to the liquid introduction means 106 so that it can be brought into a suction state by the operation of the suction mechanism of the liquid introduction means 106. The tip of the cap 110 has a shape and structure to join the tip of the recording head 104 and cover the orifice so that the liquid path inside the recording head 104 can be reduced in pressure. The suction mechanism of the liquid introducing means 106 shown in FIG. 1 has a suction pump structure, and includes a cylinder 111 with an outer frame for the suction pump and a piston 11.
It has 2. The piston 112 has a ventilation hole 113
A vent valve 114 is provided at the lower part of the vent hole 113, and three O-rings are provided between the inner wall surface of the cylinder 111 and the O-rings are provided around the outer circumference of the piston 112 to tighten the piston 112. are fitted into each of the grooves. When the piston 112 is in a steady state, a spring 115 is fixed at one end to the bottom of the cylinder 111 as necessary.
It assumes a state of being pushed up to the upper part of the cylinder 111 by. An outflow port 116 is provided at the bottom of the cylinder 111 through which the liquid sucked into the liquid introducing means 106 flows out. This outlet 1
16 does not necessarily need to be provided if the volume of the lower portion of the cylinder 111 is sufficiently large, and it is sufficient to simply provide a fine hole that allows communication with the atmosphere. Although not shown in Figure 1, the outlet 1
16 may be connected to a liquid absorbing means for absorbing the flowing liquid and evaporating it naturally. As such liquid absorption means,
It can be constructed using a so-called sponge, porous material, felt, or the like. Also, separately, the outlet 1
It is also possible to provide an outflow reservoir downstream of 16 to accommodate the outflow liquid, and to accommodate the outflow liquid in the outflow reservoir.

Next, the apparatus shown in FIG. 1 will be explained in more detail.

The second liquid reservoir 103 is provided with a liquid supply port 117 and a suction port 118 for sucking air and/or liquid. It is connected to 101. The suction port 118 communicates with an inlet 119 of the liquid introduction means 106 via a connecting pipe 105 preferably made of a flexible material. In the apparatus shown in FIG. 1, the second liquid reservoir 103 and the liquid introducing means 106 are always connected by a connecting pipe 105 except in an emergency. An inlet 120 provided in the liquid introducing means 106 communicates with the cap 110, so that the cap 110 can be connected to the recording head 104 at a predetermined time. The supply of liquid from the first liquid reservoir 101 into the second liquid reservoir 103 is performed by a downward movement of the piston 112 by manually pressing the upper end of the piston 112 that constitutes the liquid introducing means 106. be exposed. When the piston 112 descends, the vent valve 114 closes the vent hole 113 to create a negative pressure in the space region 121 of the cylinder 111 above the piston 112. This cylinder 11
The negative pressure state in the second liquid reservoir 103 is reduced through the connecting pipe 105, and a pressure difference is created between the second liquid reservoir 103 and the first liquid reservoir 101 through the feed pipe 102. This pressure difference is caused by the pressure difference between the first liquid reservoir 101 and the second liquid reservoir 101.
Transfer the liquid to 03. Piston 112
When the lowered position of the O-ring 122-1 is below the inlet 120, the cap 1
The passage within 10 is also depressurized via inlet 120 . At this time, the recording head 104 and the cap 110
When the two are connected, the liquid in the second liquid reservoir 103 is sucked into the recording head 104 based on the pressure difference formed through the liquid path inside the cap 110 and the recording head 104, and the liquid in the recording head is 10
4. Liquid is supplied to the internal liquid path. cap 1
The state of movement of the liquid in the liquid path inside the recording head 104 through the recording head 104 is such that the amount of liquid introduced into the second liquid reservoir 103 is at least supplied to the liquid introduction port 108 at the tip of the supply path 107. It forms when it reaches the point where it is immersed in liquid. Furthermore, a liquid inlet 108 for supplying liquid to the recording head 104
The inflow amount of the liquid per unit time is such that the liquid level of the liquid supplied in the liquid reservoir 103 is equal to the liquid inlet 10.
8, the fluid resistance of the feed pipe and the supply path 10 are adjusted so that the flow rate of liquid from the first liquid reservoir 101 to the second liquid reservoir 103 is smaller than the amount per unit time.
7 fluid resistance is adjusted.

Alternatively, in order to prevent gas or bubbles from entering the liquid path inside the recording head 104, filling the recording head 104 with liquid may be performed after supplying a sufficient amount of liquid into the second liquid reservoir 103. It is necessary to do so. This can be solved by making the downward movement of the piston 112 a two-stage motion. That is, in the first motion, the position of the O-ring 122-1 is between the inlet 119 and the inlet 1.
20, the piston 112 is lowered so that it is between the second liquid reservoir 103 and the second liquid reservoir 103 through the connecting pipe 105.
By reducing the pressure inside, liquid is supplied from the first liquid reservoir 101 to the second liquid reservoir 103. The degree of reduced pressure in the second liquid reservoir 103 created by this operation is greater than or equal to the level at which a sufficient amount of liquid is supplied into the second liquid reservoir 103. After sufficient liquid is supplied into the second liquid reservoir 103, as a second motion of the downward movement of the piston 112, the O-ring 1
The piston 112 is lowered until the position 22-1 is below the inlet 120, and a pressure difference is created between the second liquid reservoir 103 and the coupling means 110 through the recording head 104 to open the liquid path inside the recording head 104. fill with liquid. At this time, the speed of the downward movement of the piston 112 and the second motion are lower than the first motion.
The time interval when moving to the second motion is determined by the supply of liquid to the second liquid reservoir 103 and the recording head 104.
This is determined by considering the design of the device as well as the design of the device so that the liquid can be filled smoothly as desired.
Feeding pipe 102, connecting pipe 105, supply path 107, liquid supply port 117, suction port 118, and liquid introduction port 108
By appropriately designing the dimensions and shape of the inlet 119 and the inlet 120 as desired, and appropriately designing the dimensions of the inlet 119 and the inlet 120 in relation to these, the above-mentioned In addition, the downward motion of the piston 112 may not be a two-stage motion, but may be a continuous downward motion. Piston 112
When the level of the liquid supplied into the liquid reservoir 103 reaches a level above the suction port 118 due to the downward movement of liquid flows into. The liquid flowing into the spatial region 121 is
It also flows into the vent hole 113 and opens the vent valve 114, causing the space region 12 in the lower part of the cylinder 111 to flow.
Flows into 3. After the downward movement of the piston 112 reaches the bottom dead center, the piston 112
It rises in the direction of the home position with the repulsive force of 5. When the piston 112 is raised, the vent valve 114 is opened based on the pressure difference between the vent hole 113 and the space area 116, and the upper space area 121 of the cylinder 111 is opened.
is in communication with the atmosphere through outlet 116. When the vent valve 114 is opened, the liquid present in the vent hole 113 and/or the space area 121 is discharged from the cylinder 1.
It flows out into the lower space region 123 of No. 11. The piston 112 of the liquid introducing means 106 in the device shown in FIG. 1 has three O-rings 12 as described above.
2-1, 122-2, and 122-3 are attached, and when the piston 112 is at the normal position (top dead center), the inlets 119 and 120 are closed by the piston 112 and these O-rings. . The printing recovery operation is the same as described above when the meniscus recedes due to an imbalance due to clogging inside the recording head 104 or a drop in the liquid level in the second liquid reservoir 103, causing a problem with printing. It can be done very easily by following the steps below. This printing recovery operation will be briefly described below.

The first problem with printing is that the amount of liquid in the second liquid reservoir 103 decreases for some reason, and the recording head 104 decreases due to the drop in the liquid level in the second liquid reservoir 103. An example of this is that the meniscus from the orifice 109 is too far back. Second, the second liquid reservoir 1
When printing is performed while reciprocating 03 with the recording head 104, the meniscus retreats too much due to the impact upon return and does not recover to its normal position, resulting in unstable droplet ejection and even inability to eject droplets. This is a case of invitation. Thirdly, air bubbles are likely to be mixed into the recording head 104 during the reciprocating movement of the second liquid reservoir 103. The fourth problem is clogging due to drying of the liquid in the liquid path inside the recording head 104 or clogging due to the mixing of foreign matter.

If a problem occurs in printing due to the above-mentioned causes, printing can be recovered in the following manner.

When the cap 110 is connected to the tip of the recording head 104 and the piston 112 is pressed, the O-ring 122-1 closes to the inlet 119 in the first step.
At the same time, the upper space region 121 of the cylinder 111 communicates with the second liquid reservoir 103 via the connecting pipe 105, and the air in the second liquid reservoir 103 is sucked by the negative pressure in the cylinder 111. As a result, the liquid from the first liquid reservoir 101 is sucked and introduced into the second liquid reservoir 103. At this time, since the inlet 120 is closed by the O-rings 122.2 and 122-3, no movement of liquid through the recording head 104 occurs.

When the piston 112 further descends, the O-rings 122-1 and 122-2 close the inlet 1 in a second stage.
An inlet 119 communicates with the inside of the cylinder 111 through the recording head 104 and the cap 110, and liquid is sucked through the recording head 104 and the cap 110. At this time, if there is a substance that causes ejection prevention together with the liquid, that substance is also sucked and discharged into the upper space area 121 of the cylinder 111, and the piston 112
When the temperature rises, the ventilation hole 113, the ventilation valve 114,
The liquid is discharged to the outside of the liquid introducing means 106 through the outlet 116.

As described above, in the apparatus shown in FIG.
2, the residual air in the second reservoir 103 is first sucked out, and as a result, the liquid is introduced from the first reservoir 101 to the second reservoir 103, and after the supply path 107. After the end is immersed in the liquid, the liquid is sucked through the recording head 104, thereby preventing air from entering the liquid path inside the recording head 104. Furthermore, by repeating the pressing operation of the piston 112 as necessary, the liquid level in the second liquid reservoir 103 rises and reaches the suction port 118, but in this case, the liquid is also sucked through the suction port 118.
The liquid level in the second liquid reservoir 103 is maintained at the level of the suction port 118. In this case, a certain air layer exists in the second liquid reservoir 103 above the suction port 118;
It has the effect of absorbing shock pressure when moving.

Connecting pipe 105 is used to adjust the flow rate of liquid or/and air through recording head 104 and the flow rate of liquid or/and air through connecting pipe 105.
It is possible to provide a fluid resistance element. Such fluid resistors are made of porous plastics, porous ceramics, glass with micropores, felt,
Consists of sponge, orifice, etc.

Preferably, in the liquid inlet 108 of the supply path 107,
In order to prevent non-fluid foreign matter mixed in the liquid in the second liquid reservoir 103 from entering the liquid path inside the recording head 104 and clogging the liquid path, a foreign matter removal device is installed. It is desirable to provide a filter.

FIG. 2 schematically shows a second embodiment of the present invention.

In the example shown in FIG. 2, there are two O-rings attached to the piston 212 constituting the liquid introduction means 206, and the two O-rings are attached at the top dead center of the piston 212.
The inlet 220 is closed with a real O-ring, and the inlet 219 is connected to the upper space area 22 in the cylinder 211.
The configuration is essentially the same as the example shown in FIG. 1, except that it is always in communication with 1. In the case of the device shown in FIG. 2, even if the second reservoir 203 is filled with liquid and there is no air layer, the piston 213
By opening the vent valve 214 provided in the printer and communicating with the atmosphere, it has the effect of releasing pressure even if a sudden and strong internal pressure change that adversely affects printing occurs.
In addition, against liquid leakage to the outside, which is likely to occur during transportation of the device, the liquid leakage can be prevented by determining the resistance of the fluid resistance body provided in the vent valve 214 and the connecting pipe 205 as desired. You can.

FIG. 3 shows a third embodiment of the invention.

This embodiment is essentially the same as the embodiment shown in FIG. 1, except that the connecting pipe shown in the embodiment shown in FIGS. 1 and 2 is separable. are the same. The connecting pipe 305 is provided on the second liquid reservoir 303 side and has a connecting path portion 305-1 formed to have a protruding portion at the tip for easy fitting, and a connecting path portion similar to the cap 310. A connecting path portion 305-2 provided on the liquid introduction means 306 side and having a structure into which 305-1 can be inserted.
Consists of. If a member forming the connecting path portion 305-1 is used that has the same structure and dimensions as the member forming the liquid path of the recording head 304, the number of parts can be reduced, which will lead to cost reduction. It is desirable for Connecting road portion 305-
1 and 305-2, for example, the second liquid reservoir 3
03 and the recording head 304 is stopped at a predetermined position, and before the liquid introduction operation of the liquid introduction means 306 is performed, the operation mechanism is simplified in that the operation is performed together with the joining operation of the recording head 304 and the cap 310. This is desirable for ensuring the accuracy and execution of operations. The connecting path portion 305-1 acts as a pressure relief against sudden and strong changes in the internal pressure of the second liquid reservoir 303 that may affect printing. -1
The size and structure are determined so that the surface tension at the tip of the

As explained above, in the present invention, in the liquid introduction action of the liquid introduction means, by providing a temporal phase difference between when the liquid is introduced via the second connection path and when it is via the recording head, it is possible to The air in the second liquid reservoir is sucked to create a reduced pressure state, and based on this, liquid is supplied from the first liquid reservoir to the second liquid reservoir.Then, the liquid is sucked from the recording head, so that the pressure inside the recording head is reduced. There is no problem of air being sucked into the printer, and print recovery is reliable. Moreover, since it does not have a complicated mechanism, the device can be made smaller and lower in cost. Furthermore, as a derivative effect, the liquid supply to the second reservoir is stopped due to the resistance against the decrease in the internal pressure of the first reservoir caused by the decrease in the amount of the first reservoir liquid, but in the present invention, In this case, the liquid can be stably supplied from the first liquid reservoir to the second liquid reservoir by the forced liquid introduction operation of the liquid introducing means. Therefore, if the liquid supply from the first liquid reservoir frequently stops, the remaining amount of liquid in the first liquid reservoir is low, and it is necessary to replace the first liquid reservoir or to replace the first liquid reservoir. It is easy to detect when the liquid replenishment time is near. Further, by the above-described operation, it is possible to transfer the liquid in the first liquid reservoir to the second liquid reservoir without leaving any remaining liquid, so that the liquid can be used without wasting it.

In the examples shown in FIGS. 1 to 3, the recording head is shown having a structure having only one ejection orifice, but the present invention is applicable to so-called multi-orifice type recording having two or more ejection orifices. This can also be applied when using a head. Further, the first liquid reservoir in FIGS. 1 and 3 is preferably a bag-shaped one with a variable internal volume, but if it is in the shape of a hard case, there is a ventilation hole communicating with the atmosphere. 124, 224, and 324 are preferably provided.

Furthermore, the form of the recording head in the present invention is not particularly limited; for example,
Recording heads that use piezoelectric elements as described in publications such as USP3683212, USP3946398, and USP3747120, recording heads that utilize thermal energy as described in German Publication No. 2843064, and furthermore, Modifications of the recording head described above and other forms of the recording head applied to so-called continuous method liquid jet recording apparatuses that control the direction of flight of flying droplets can be cited.

Next, an example in which the liquid jet recording apparatus of the present invention is applied as a printer will be described.

FIGS. 4 and 5 show an example of the configuration of a printer to which the liquid jet recording apparatus of the present invention is applied.
NZ is the inkjet nozzle (recording head), which is an electrostrictive element that generates the energy for ejecting droplets.
A PZ is provided. Inkjet nozzle NZ
is installed in the carriage CA, and this carriage CA
The reciprocating drive of is controlled by a linear motor. The linear motor constitutes a closed magnetic circuit with a permanent magnet PM, a magnetic yoke plate Y1, and a magnetic sliding shaft Y2, and forms a uniform magnetic field between the permanent magnet PM and the magnetic sliding shaft Y2. Then, the carriage CA can be slid on the magnetic sliding axis Y2 so that a part of the coil CO wound around the coil bobbin CB (see Fig. 5), which is integrated with the carriage CA, crosses the above-mentioned magnetic field at right angles. Deploy. . Here, coil bobbin CB
When the coil CO wound around is energized, the carriage CA moves back and forth on the sliding axis Y2 with the driving force generated by Fleming's right-hand rule. The reciprocating motion of the carriage CA on the drive shaft Y2 is performed by utilizing the fact that the direction of the driving force changes by changing the direction of the current flowing through the coil CO wound around the coil bobbin CB.

The carriage CA is equipped with a light emitting diode LEA as a timing pulse generating element to detect the position of the carriage CA and to control the ink jetting timing of the inkjet nozzle NZ, paper feeding, etc.
and a phototransistor PTA are arranged facing each other as shown in Fig.
Place a receiving slit GS with a slit of the same width as the SS. Also, in the carriage CA,
The electrical connection plate PC is fixed, and the terminals CT1 and CT2 of the coil CO and the terminals PT1 and PT of the electrostrictive element PZ are fixed.
2. The terminal LET of the light emitting diode LEA and the terminal PTT of the phototransistor PTA are respectively attached to the upper surface of the connection plate PC. Also, these terminals are
Each is connected to a flexible cable FL fixed to one end of the connection plate PC. The other end of the flexible cable FL is folded back in the middle of the cable, and the cable FL is fixed to the printer by a holding plate P2. The end of the folded cable FL is connected to a connector (not shown), and the drive of the carriage CA and the electrostrictive element PZ of the inkjet nozzle NZ are controlled via the flexible cable FL. Furthermore, from the bottom end of the carriage CA, there is a shield plate SB.
is protruded, and when the shielding plate SB is positioned in the recess of the initial position detection member HPD with a concave cross section arranged on the magnetic yoke plate Y1, the light emitting diode LEH placed opposite to the recess of the detection member HPD and phototransistor PTH are shielded by this shielding plate SB, and the initial position HP of the carriage CA is detected.

ST is a sub tank (second reservoir) attached to the carriage CA, and the ink stored in the main tank MT (first reservoir) is transferred to the ink supply pipe (first connection path) DT- The ink is supplied to this sub-tank ST via 1, and from there to the ink jet nozzle NZ. DT-2 is a connecting pipe (second connecting path) for communicating between the suction pump (liquid introducing means) PP and the sub-tank ST, and is a connecting pipe (second connecting path) for communicating between the suction pump (liquid introducing means) PP and the sub-tank ST, and is a connecting pipe to the sub-tank ST and inkjet nozzle NZ in the initial state. This is to suck air and/or liquid in the sub-tank ST to the suction pump PP side when supplying ink or recovering from printing problems due to clogging or liquid shortage. The ink supply pipe DT-1 and the connecting pipe DT-2 are connected to the fixed plate P.
2, one point is fixed. PMT is a pulse motor, PL is a platen loaded with printing paper PP, and the driving force of the pulse motor PMT is generated by a gear (not shown) attached to the tip of an output shaft (not shown) taken out from one end of the pulse motor PMT. gear G1 and gear G2 fixed to the shaft of platen PL
The deceleration is transmitted to drive the platen PL to feed the paper.

D1 and D2 are collision dampers fixed to both ends of the magnetic sliding shaft Y2, which soften the impact force when the carriage CA traveling on the sliding shaft Y2 collides with both ends of the sliding shaft Y2. inkjet nozzle
This prevents ink from leaking from NZ and the meniscus from receding too much, and also prevents ink from bubbling inside the sub-tank ST. The dampers D1 and D2 are made of an elastic body such as foam. KP is a connecting tube that connects with the inkjet nozzle NL to suck ink from inside the nozzle NL during ink supply or print recovery operations.After printing is completed, the tip of the inkjet nozzle NZ is This is a cap that covers the inkjet nozzle NZ to prevent it from clogging and drying out.

OS is an optical slit for detecting printing position.
A large number of slits SS are opened at equal intervals.
As shown in FIG. 5, the optical slit OS is arranged in a space where a light emitting diode LEA and a phototransistor PTA, which serve as a pair of timing pulse generating elements arranged in the carriage CA, face each other.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram for explaining the configuration of a first preferred embodiment of the present invention, FIG. 2 is a second embodiment, and FIG. 3 is a third embodiment. FIG. 4 is a schematic perspective view showing an example of the external appearance when the device of the present invention is applied to a printer, and FIG. 5 is a cross-sectional view taken along line A-A. . 101, 201, 301...first liquid reservoir, 10
2,202,302...feeding pipe, 103,20
3,303...Second liquid reservoir, 104,204,3
04... Recording head, 105, 205, 305...
...connecting pipe, 106,206,306...liquid introduction means, 107,207,307...supply path, 10
8,208,308...liquid inlet, 109,20
9,309...discharge orifice, 110,21
0,310...Cap, 111,211,31
1...Cylinder, 112,212,312...Piston, 113,213,313...Vent hole, 1
14,214,314...Vent valve, 115,21
5,315...Spring, 116,216,3
16...Outflow port, 117,217,317...Inflow port, 118,218,318...Suction port, 11
9,219,319...Inlet, 120,22
0,320...Inlet, 121,221,321
...Upper space area, 122, 222, 322...
O-ring, 123, 223, 323...lower space area.

Claims (1)

[Scope of Claims] 1. A recording head having an orifice for discharging a liquid, a first liquid reservoir containing the liquid, and a second liquid reservoir communicating with the recording head and storing a liquid to be supplied to the recording head. a feeding pipe connecting the first liquid reservoir and the second liquid reservoir; a cap covering the orifice; and a connection connecting the second liquid reservoir as a liquid introducing means. A liquid jet recording device comprising: means for introducing liquid into the second liquid reservoir by suction through a tube; and means for introducing liquid into the recording head by suction through the cap. . 2. The liquid jet recording device according to claim 1, wherein the liquid introducing means is a suction pump. 3. The liquid jet recording apparatus according to claim 1, wherein the cap and the liquid introducing means are integrally constructed. 4. The liquid jet recording apparatus according to claim 1, wherein the recording head and the second liquid reservoir are movable together. 5. The liquid jet recording device according to claim 1, wherein the connecting pipe is separable into two parts: a second liquid reservoir side and a liquid introducing means side. 6. The liquid jet recording device according to claim 1, wherein the second liquid reservoir can communicate with the atmosphere through the connecting pipe. 7. The liquid jet recording device according to claim 1, wherein the connecting pipe has a fluid resistance element. 8. The liquid jet recording device according to claim 1, wherein the second liquid reservoir has an air layer above it. 9. The liquid introduction means according to claim 1, wherein the liquid introducing means has an outlet for causing the liquid to flow out, and a liquid absorbing means is provided on the side of the outlet from which the liquid flows out. Liquid jet recording device.