WO2013147167A2 - インクジェット記録装置 - Google Patents

インクジェット記録装置 Download PDF

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Publication number
WO2013147167A2
WO2013147167A2 PCT/JP2013/059547 JP2013059547W WO2013147167A2 WO 2013147167 A2 WO2013147167 A2 WO 2013147167A2 JP 2013059547 W JP2013059547 W JP 2013059547W WO 2013147167 A2 WO2013147167 A2 WO 2013147167A2
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WO
WIPO (PCT)
Prior art keywords
ink
ink tank
carriage
print head
tank
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Application number
PCT/JP2013/059547
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English (en)
French (fr)
Japanese (ja)
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WO2013147167A3 (ja
Inventor
敬 斎藤
Original Assignee
Saito Takashi
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Application filed by Saito Takashi filed Critical Saito Takashi
Publication of WO2013147167A2 publication Critical patent/WO2013147167A2/ja
Publication of WO2013147167A3 publication Critical patent/WO2013147167A3/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17506—Refilling of the cartridge
    • B41J2/17509—Whilst mounted in the printer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/1752—Mounting within the printer

Definitions

  • Clarification of basic element conditions that can increase the capacity of ink that is a consumable to be mounted without increasing the size of the main body of the inkjet recording device used in homes and offices, and simple ink based on it
  • the present invention relates to the configuration of the supply device.
  • a carriage equipped with a print head that reciprocally scans in a direction perpendicular to the paper traveling direction, and each color ink tank is detachably mounted on the carriage.
  • another ink tank group is provided separately from the ink tank on the carriage, and the method of supplying ink from there to the ink tank on the carriage is also adopted depending on the purpose of use of the recording device. ing. In either method, stable ink supply to the print head is a basic problem, and various ideas have been accumulated for better solutions.
  • Inkjet recording devices of the consumer product genre are on-carriage ink tanks, which are consumables that can be replaced when ink runs out. These are called ink cartridges, but this method is the mainstream and is used in most products. ing.
  • the ink cartridge, which is a consumable item, has not changed the amount of ink that can actually be printed and the price, despite the enormous production volume for a long time.
  • the ink cartridge used in the Japanese market is composed of four black and YMC color inks, and the actual sales price is about 5,000 yen (1 unit) Then, about 1,000 yen).
  • the number of sheets that can be printed in A4 size in the standard manuscript / standard printing mode (ISO / IEC2472 and 2471 compliant) is about 500. Therefore, the cost of printing ink for one sheet is about 10 yen.
  • the catalog generally contains numbers of such a level. Since four colors of ink are used, the average number is 125 printable sheets per one color ink cartridge.
  • the system in which the ink tanks of each color are mounted on the carriage in a freely replaceable manner will be called the on-carriage ink tank system.
  • the on-carriage ink tank system In addition to the ink tank fixed on the carriage, another type of replaceable ink tank, and a method of supplying ink from there to the ink tank on the carriage is called an off-carriage ink tank method.
  • 1, 2, 3 show on-carriage ink tank type printers.
  • an ink tank having a width of about 1.5 cm, a depth of 5 to 7 cm, and a height of 4 to 5 cm is mounted in a replaceable manner.
  • a black ink whose main purpose is to print characters is usually about twice as wide as the above.
  • the number of tanks may be a combination of four, black, yellow, magenta, cyan, and black for photography, seven, plus photo magenta and photocyan.
  • the total width of the entire tank, including other color cartridge combinations, is approximately 8-12 cm.
  • a solid carriage having a replacement mechanism is required, and the width for that purpose is also added.
  • the width of the apparatus main body is required to be at least the paper width plus 20 cm.
  • the width of most consumer genre printers is well over 40cm. Therefore, it is difficult to increase the width of the ink tank any more in order to increase the amount of ink.
  • the height and depth are close to the limit.
  • increasing the on-carriage ink tank also increases the load on the motor that moves the carriage. The precision of carriage movement is a lifeline for printers.
  • the on-carriage ink tank method has not increased the ink capacity for many years.
  • the total width is about 7 cm.
  • a width in the width direction of 14 cm is required. Even in such a relatively narrow product group of ink cartridges, the increase in the amount of ink remains unchanged.
  • the content of the ink tank in the above example is about 30cc.
  • the water head pressure is too high, and the ink may leak from the print head 4.
  • sponge-like stuffing, a maze, and a valve are provided to prevent ink from dropping from the print head.
  • Japanese Patent Application Laid-Open No. 07-068773. Although this technique is later improved and is considered to be used in actual products, the use efficiency of the ink cartridge volume drops to almost half due to this filling, and the effective ink amount is about 15 cc, for example.
  • the ink consumption is about half that of the standard original printing, and the ink consumption per sheet is about 0.05 cc.
  • It is a conversion value from the sum of the ink amount actually used for printing and the ink amount used for maintenance). Therefore, it can be said that printing of approximately 300 sheets / one ink cartridge is possible in calculation. This is consistent with the upper limit of the actual feeling of many users. (In this proposal, the explanation will be continued using 0.05 cc of ink consumption per sheet.)
  • the width of the device body On a desk or office with a narrow home or SOHO, there is nothing special even if the height is, for example, 18 cm becomes 23 cm. However, if the width is 43 cm, for example, 48 cm, the occupied area is widened and it is quite difficult. It will be wider than laser printers of the same genre. It is a condition that the off-carriage ink tank for replenishing ink is not arranged in the width direction of the main body.
  • Reference numeral 5 denotes an on-carriage ink tank in the off-carriage ink tank system
  • 5 'indicated by a dotted line denotes an on-carriage ink tank in the on-carriage ink tank system
  • Reference numeral 6 denotes a place where the off-carriage ink tank can be placed, which is the top and bottom of the on-carriage ink tank.
  • the position of B that is, the arrangement under the print head has been considered good.
  • the basic idea is to suck up ink from the ink tank by the negative pressure generated by the print head by ink ejection. It is said that since the ink tank is at the lower side, there is no fear of ink dropping from the print head due to the water head pressure of the tank, so that a simple mechanism can be used.
  • JP-A-2001-138541, JP-A-2010-228237, JP-A-2009-226026 and JP-A-2009-226026 can be referred to.
  • a buffer chamber (called a sub-tank) is decompressed to a negative pressure state by a pump to stabilize printing, and if necessary, the buffer chamber is pressurized to a positive pressure state to store the stored ink.
  • the printer head automatically sends it out.
  • a sensor, a switching valve, a control device, and the like are inevitably required, resulting in a costly configuration.
  • these underlays are only one solution, and the present invention does not relate to them.
  • FIG. 4D in FIG. 4 which is a candidate placement location of the off-carriage ink tank, this location is in the back of the main body, and tank replacement is not user friendly and therefore not adopted.
  • User friendly places are places A and C.
  • an off-carriage ink tank is placed on the upper side of the print head, and the same logic can be considered as an ink supply mechanism.
  • the ink tank can be easily replaced from the front side of the apparatus.
  • ink drops from the print head due to the water head pressure applied to the print head become an essential problem. Control of water head pressure is troublesome.
  • an ideal space can be obtained as an ink tank arrangement place.
  • the aim of the present invention is to control water head pressure.
  • a buffer chamber When placing on the off-carriage ink tank, a buffer chamber is basically provided at the same height as the print head, and the ink from the off-carriage ink tank is first guided here. Water pressure is applied to the buffer chamber, but it is cut off here so that it does not reach the print head.
  • Citation 5: Japanese Patent Laid-Open No. 2011-245731 introduces a method of preventing ink drop by adjusting the pressure of the ink in the print head by adjusting the pressure of the upper space in the upper tank. A pressure control pump is used. At the time of cleaning the print head, the pressure of this tank is raised above the specified pressure by the control device, and the nozzle is intentionally dropped from the discharge port of the head. In any case, the pump, sensor and controller are essential components.
  • An object of the present invention is to create an advanced ink supply system that has a stable ink supply performance, and (2) is realized with a simple and inexpensive configuration that makes it a consumer product.
  • the present invention provides, as a first problem solving means, in an ink jet recording apparatus, an on-carriage ink tank integrated at least with a print head, and a replaceable replenishment disposed above the print head.
  • An ink supply system comprising an ink tank and a flexible ink conduit for guiding ink from the replenishing ink tank to the on-carriage ink tank; and a water head pressure control mechanism for controlling the water head pressure to the print head
  • the water head pressure fluctuation range ⁇ h mmH2O that the ink in the replenishing ink tank brings to the print head is within the allowable negative pressure fluctuation range ⁇ p mmH2O of the liquid chamber connected to the print head.
  • the height width of the ink tank for replenishment is within 2p mm, these conditions
  • an ink jet system recording apparatus which is characterized in that the ink supply to the on-carriage ink tank from the replenishing ink tank only in the water head pressure and the negative pressure.
  • the ink jet recording apparatus has a water head pressure control value of (H + P) mmH2O.
  • the problem solving means 3 adds the arrangement conditions of the replenishment ink tank to the arrangement conditions of the problem solving means 1 and 2, the on-carriage ink tank scanning space, the paper feed mechanism, and these
  • the ink jet recording apparatus is characterized in that an arbitrary position in the space over the entire width of the recording apparatus avoiding the drive transmission mechanism is provided.
  • an excessive positive pressure releasing mechanism for mixed bubbles is provided above the hydraulic head pressure control mechanism, and ink pulsation is reduced in the on-carriage ink tank.
  • a buffer mechanism is provided.
  • FIG. 1 shows a cross-sectional view of a conventional model
  • Fig. 2 shows a plan view
  • Reference numeral 1 denotes a paper cassette
  • 2 denotes a paper discharge tray
  • printing paper is conveyed from 1 to 2 through a paper path indicated by a dotted line 3 and discharged.
  • ink droplets are ejected from the print head 4 according to information, and printing is performed.
  • Reference numeral 5 denotes a replaceable on-carriage ink tank, and this method is mainstream in order not to enlarge the main body.
  • FIG. 3 is a perspective view showing how the on-carriage ink tank in the conventional machine is replaced. Open the upper mechanism of the tank, and at the same time move the carriage to the center and then replace it.
  • FIG. 4 shows a perspective view.
  • a direction orthogonal to the printed material traveling direction that is, a direction in which the on-carriage ink tank performs a reciprocating scanning motion, this is referred to as a product width. This is the width viewed from the user when the user is to use the product facing the printed product outlet side.
  • a space enclosed by an alternate long and short dash line in FIG. 5 and FIG. 6 (indicated by reference numeral 12), that is, a relatively shallow space that avoids the scanning space of the lower on-carriage ink tank and the paper feed mechanism (9 in FIG. 5) in the vertical direction.
  • these drive transmission mechanisms are avoided, and a large space is obtained which is composed of a wide space almost full of the lateral width of the recording apparatus main body.
  • What is schematically shown in the plan view of FIG. 6 is an off-carriage ink tank for replenishment with a large capacity.
  • Judgment criterion 1 is a method for obtaining a degree of freedom of expansion in terms of increasing the capacity, but sufficiently satisfies this criterion.
  • Judgment criterion 2 is a user's ease of replacement, but is a complete front operation as shown in FIG. It is only necessary to open the front door 9 and replace the ink tank for replenishment at the indicated (not shown) place.
  • FIG. 7 unlike FIG. 6, an example in which seven color ink tanks are arranged in the full width is shown.
  • both A and C are obtained from the upper part of the printed material conveyance path, and there is no difficulty in space, and one point of concern is whether water head pressure control is easy. If even this is simple, expensive things such as pumps, sensors and their control systems / circuits are unnecessary. This is described in detail in the following section. As already described, the criterion 4 can shorten both the width and the height, that is, the condition is sufficiently satisfied.
  • the ink tank for replenishment is arranged above the front of the printer.
  • An example can be seen in FIG. 2 of Patent No. 4359875 of Cited Reference 6.
  • the gist of the present invention is the logic that realizes this arrangement with a simple mechanism.
  • the ink supply to the ink tank on the carriage uses only the negative pressure derived from the print head and the water head pressure derived from the refilling off-carriage ink tank, and does not use a pump or a sensor.
  • a film 25 is fixed to the outer periphery of the region of the case main body 2A containing the ink bag 9 by heat welding to seal the inside.
  • This sealed space is sealed without the pressurized fluid (pressurized air in this embodiment) introduced from the pressurized fluid inlet 4 leaking to the outside, and the ink bag 9 contains the ink by the pressurized fluid.
  • the lid member 2B is fixed to the case main body 2A by an engagement protrusion 27 formed on the lid member 2B so as to cover the film 25. The protection of the film 25 and the prevention of unnecessary expansion of the film 25 at the time of pressurization are carried out, "as shown in FIG.
  • the water head pressure fluctuation range ⁇ h mmH2O brought by the ink in the refilling ink tank to the print head is within the negative pressure fluctuation tolerance ⁇ p mmH2O of the liquid chamber connected to the print head, that is, the height width of the refilling ink tank
  • ⁇ p mmH2O the negative pressure fluctuation tolerance of the liquid chamber connected to the print head
  • 2h mm ⁇ is within 2p mm. See FIG. 8 and FIG.
  • One of the essential conditions is that “the ink head does not leak even when the water head pressure from the replenishing ink tank to the print head is maximum and the negative pressure applied to the print head is the weakest”. That is the point.
  • the height of the ink tank for replenishment from the print head is (H ⁇ h) mm.
  • (H + h) mm is the hydraulic head pressure when the ink is full, and (H ⁇ h) mm is the hydraulic head pressure immediately before the ink reaches the bottom.
  • a negative pressure range in which ink does not leak from the print head and discharge is not high enough to be a problem is ⁇ (P ⁇ p) mmH 2 O.
  • a head pressure control mechanism for controlling the head pressure caused by the ink in the replenishing ink tank is disposed at the same level as the print head. In a typical configuration, it is provided at the bottom of the on-carriage ink tank connected to the print head.
  • One example of a mechanism is a valve. Assume that the opening pressure of this valve is SmmH2O.
  • the above essential conditions can be expressed as follows. S- (H + h) ⁇ Pp (1)
  • the left side is when the maximum hydraulic head pressure H + h (mmH2O) is applied to the valve, that is, when it becomes S- (H + h), and this represents the state in which the valve is most likely to open.
  • the valve has more force than Pp where the negative pressure is the weakest, so the valve is not trying to open.
  • the density of the ink is set to 1 which is the same as that of water. Actually, the density of ink, which is mostly water, is approximate, and there is no problem in handling in this way.
  • Another essential condition is “the valve must be opened when the maximum value P + p of negative pressure is applied to the valve even under the condition that the valve is most difficult to open”. That is, S ⁇ (H ⁇ h) ⁇ P + p (2)
  • the left side represents a state in which the minimum hydraulic head pressure Hh is applied to the valve and the valve is most difficult to open. Nevertheless, when the force of P + p with the strongest negative pressure is applied downward, the valve opens, supplying ink and preventing further increase of the negative pressure.
  • the maximum value of h is p.
  • the negative pressure is ⁇ 25 mm ⁇ 10 mm H 2 O, this suggests that the height 2h of the replenishing ink tank is 20 mm corresponding to 2p.
  • the off-carriage ink tank 6 includes a connecting seal member 63.
  • the connecting mechanism 71 of the printer body is provided with a needle 72.
  • the ink tends to flow from the needle 72 into the ink chamber 50 of the on-carriage ink tank 5 through the flexible ink conduit 7.
  • a water head pressure control mechanism 51 is provided in the ink chamber. When the ink is purged from the print head by the initial setting control program when the off-carriage ink tank is replaced, the negative pressure in the liquid chamber 56 connected to the print head increases and reaches the design opening pressure S, the water head pressure control mechanism 51 is configured.
  • the central element valve body 55 is pulled downward against the coil spring 53 to open as shown in FIG. 9, and ink flows from the ink chamber 50 into the liquid chamber 56 connected to the print head. As a result, the negative pressure in the liquid chamber 56 decreases.
  • the valve body 55 is pulled back by the coil spring 53 and the ink flow is stopped. Thereafter, the ink discharge, negative pressure increase, valve opening, valve closing, negative pressure optimization, ink discharge, and the like are repeated by the printing operation.
  • 52 is a valve box and 54 is a valve seat packing, both of which are components of the hydraulic head pressure control mechanism 51.
  • Ink delivery from the off-carriage ink tank is performed only by the head pressure and negative pressure, and this is controlled by the head pressure control mechanism 51, which is a simple valve mechanism. No sensor or pump is required.
  • negative pressure associated with delivery should not be generated here.
  • a hard ink container 60 is used, and an ink bag 61 that is soft and naturally deflates as the ink is delivered is used.
  • an ink bag 61 that is soft and naturally deflates as the ink is delivered is used.
  • the opening / closing threshold value S of the valve body 55 is obtained by setting the coil spring force so as to be (P + H) mmH2O.
  • the above is the basic principle of the problem-solving means of the present invention and the explanation of the operation.
  • the effects of this are as follows. 1.
  • the replenishment ink tank is arranged above the print head, thus ensuring the wide arrangement space and the degree of freedom of expansion shown by the alternate long and short dash line 12 in FIGS. 5 and 6, and only one point.
  • the above condition: h ⁇ p A simple configuration that only requires protection is possible.
  • a buffer chamber and a pumping pump that are required in other arrangements and methods that have been proposed so far are not necessary for supplying ink.
  • Mechanical elements such as ink transfer means, sensors, switching valves, and flanges and control circuits related to these are also unnecessary.
  • the ink simply flows down according to the water head pressure and negative pressure and flows into the on-carriage ink tank. It is simple, so it can reliably achieve the required functions at low cost.
  • An object of the present invention is also not to increase the size of the recording apparatus.
  • the height of a typical on-carriage ink tank that has been used unchanged for 20 years is a trade-off that you want to load as much ink as possible, but you must avoid dropping ink. Due to its nature, it continues to be approximately 40 mm to 50 mm in height. And there is some simple organs to control the water head pressure.
  • the on-carriage ink tank integrated with the print head is not intended to store ink here, so it can be smaller.
  • the height is 10 mm to 20 mm, although it depends on the type of valve mechanism or similar head pressure control mechanism to be included.
  • the width of the recording apparatus can be reduced. Although it is a repetition of the description in the section on operation, it was described in the previous section that “the on-carriage ink tank is small because it is not intended to store ink here”, but this is not only the height.
  • the width can be reduced. For example, within a few mm, and within 1 cm anyway. This number is merely an example, but it should be understood that the greater the number of ink colors, the greater the effect because the effect on the recording apparatus main body width is doubled.
  • the ink tank for replenishment can be arranged in the space 12 surrounded by the one-dot chain line in FIGS. 5 and 6 on the premise that the conditions of the problem solving means 1 and 2 are satisfied.
  • This space is an upper position on the front side facing the user of the main body, and refilling ink tanks can be arranged in a line in a horizontal line there. It is very easy for the user to exchange.
  • the upper lid is opened, and in the case of a multifunction machine, the upper scanner is lifted together, but the ink tank is exchanged so as to look into it.
  • the size of the ink tank for replenishment is illustrated using numbers. For example, if the height is 22 mm (inner side 20 mm), the lateral width is 40 mm (inner side 38 mm), and the depth is 80 mm (inner side 70 mm), the internal capacity is 53.2 cc. As described above, assuming that the ink consumption of one printed sheet is 0.05 cc, the number of printed sheets is 1,064. The number of printable sheets is nearly three times that of conventional machines.
  • calculation is made with an example of black for text, black for photography, yellow, magenta, cyan, photomagenta, and photocyan for convenience. The black for characters is made large, for example, the width is 60 mm.
  • the depth and width of the ink tank may be slightly narrowed to increase the depth. In this way, the degree of freedom in design becomes extremely high. However, it is essential that the inner height of the ink tank is 20 mm, and it is only necessary to keep this. (When negative pressure fluctuation tolerance is 20mm)
  • An excessive positive pressure releasing mechanism for mixed bubbles is provided at the upper part of the water head pressure control mechanism. This is indicated by 59 in FIGS. If air bubbles are mixed in the ink chamber 50 for some reason (melted gas, mixed gas at the time of ink tank replacement, etc.), it expands when the liquid temperature rises, etc., and unintentionally pushes down the valve against the spring force, and the ink Will be pushed into the liquid chamber. As a result, the negative pressure in the liquid chamber is reduced, and ink drops from the print head 4 are caused. Bubbles are exemplarily shown in FIG. 8 and FIG. In order to prevent such an inconvenience, “gas release or excessive positive pressure release” is necessary.
  • the mechanism is basically incorporated in all on-carriage ink tanks. Also in the configuration of the present plan, it is a necessary mechanism in combination with the basic structure of the water head pressure control described above, and by this incorporation, it is possible to prevent inadvertent dropping of the print head.
  • the on-carriage ink tank repeatedly vigorously reciprocates due to the printing operation, and the ink inside it is always in a disturbed state. If the individual ink state is directly transmitted to the print head, stable ejection cannot be performed. Therefore, a buffering mechanism for relaxing the turbulent movement of the ink is provided so as to protect the print head as indicated by numeral 57 in FIGS.
  • This uses a continuous porous material, such as a sponge or fiber stuffing.
  • FIG. Schematic diagram of ink tank replacement Candidate space for replacement off-carriage ink tank Schematic diagram of typical configuration of this plan (cross section)
  • the plan view FIG. Schematic diagram of ink tank arrangement example and replacement Replenishment ink tank and on-carriage ink tank, 1 Refill ink tank and on-carriage ink tank, part 2 Gas release mechanism 1 Gas release mechanism 2 Other hydraulic head pressure control mechanism 1 Other hydraulic head pressure control mechanism 2 Still another head pressure control mechanism, part 1 Still other head pressure control mechanism, part 2 Other gas release mechanisms 1 Other gas release mechanisms 2
  • the basic configuration of the recording apparatus shown in FIGS. 5 and 6 and the hydraulic head pressure control mechanism 51 shown in FIGS. 8 and 9 used in the description so far are typical forms of the present invention.
  • a specific configuration is shown by a consumer product genre photo printer using six colors of black, yellow, magenta, cyan, orange, and green.
  • the inner dimension of each color of the on-carriage ink tank was 0.9 cm.
  • the width of the main body is 21 cm, the width of the main body is 39 cm by adding 7 ⁇ 2 cm + ⁇ (approximately 4 cm due to mechanical parts such as gears and the thickness and gap of the exterior).
  • the carriage width of the conventional on-carriage ink tank mounted is about 10 cm or more, and therefore the main body width is well over 40 cm.
  • Depth is 5.0cm in internal dimensions and not shortened. This is because there is a sufficient margin in the depth direction of this place.
  • the height was set to an outer dimension of 2.0 cm and an inner dimension of 1.6 cm.
  • the capacity is about 7 cc.
  • the free ink liquid amount (liquid amount excluding the liquid amount contained in the buffer member) is about 3 cc. This is the amount of liquid capable of printing about 100 sheets by continuous printing.
  • 0.03 cc is used for printing one standard original.
  • the liquid chamber connected to the print head must be kept at a negative pressure.
  • the allowable width ⁇ (P ⁇ p) mmH2O is determined by factors such as the hole diameter and shape of the print head and the viscosity of the ink used. In a typical example, P is a level of 25 mmH2O and p is 10 mmH2O.
  • -(P ⁇ p) mmH2O is generally in the range of-(20 ⁇ 10) mmH2O to-(30 ⁇ 15) mmH2O.
  • the center of the off-carriage ink tank in the height direction is provided 5 cm from the print head.
  • the characteristics of the coil spring were designed so that the opening pressure S of the valve body was H + P, that is, 75 mmH2O.
  • the size of the off-carriage ink tank can be designed with a high degree of freedom as long as the height and width are strictly observed. What is exemplified in the section of action and effect is a part of a typical tank. As shown again, the height x width x depth is 20 mm x 38 mm x 70 mm in terms of inner diameter, and the printing dose is about 1,000 sheets. If the depth direction with more margins is doubled to 140 mm, 2,000 sheets can be printed. For business use printers, four colors are often sufficient. In such a case, the lateral width is further doubled, and 4,000 sheets can be printed.
  • a tank capable of printing 10,000 sheets can be easily designed.
  • the tank can be designed freely as long as the height is 2 cm (with an inner diameter). Since the height of the on-carriage ink tank can be lowered, the space left there becomes a suitable place for the replacement ink tank. Moreover, it can be used to the full width of the device. There is enough space in the depth direction. Regardless of whether you prefer the height of the tank, it is low anyway. This in turn brings about such design freedom or extensibility.
  • a simple and reliable method may be a two-way valve and an atmosphere communication hole of a combination of the two, in which a film having a characteristic of not allowing liquid to pass through but allowing gas to pass therethrough is stretched.
  • a gas release mechanism 59 is provided in the upper part of the ink chamber 5, and an upper open hole 59-1 and a lower open hole 59-2 are provided in this, and a porous tetrafluoride is formed on the ink side of the lower open hole 59-2.
  • Ethylene A thin film 59-3 having a trade name of POFLON may be stretched and sealed.
  • a one-way valve 59-4 that opens only in the upper direction is provided above the lower opening hole 59-2.
  • the one-way valve 59-4 opens as shown in FIG. 11, and the mixed gas is released to the upper atmosphere. Otherwise, even if the ink chamber 50 becomes negative pressure, the one-way valve 59-4 is closed as shown in FIG. 10, and air is not sucked from the outside.
  • Reference numeral 52-2 denotes a valve box
  • 55-1 denotes a valve body made of a thin spring plate, which closes the inflow port 52-3.
  • the valve body has an opening pressure set to SmmH2O.
  • the valve body opens as shown in 55-1 of FIG. 13 and allows ink to pass through the inflow port 52-3.
  • FIGS. 52-2 is a valve box
  • 55-2 is a spherical ball
  • 55-3 is a coil spring.
  • the ball and spring constitute a valve body.
  • the valve body opens and allows ink to pass through the inflow port 52-3 as shown in 55-2 of FIG.
  • 16 and 17 are enlarged views of other embodiments of the gas discharge mechanism 59.
  • 59-5 is a spherical ball
  • 59-6 is a coil spring.
  • the ball and spring constitute a valve body.
  • Fig. 18 shows an example of a business use printer configuration.
  • the ink capacity may exceed 10,000, for example. This is easily possible as shown in this figure.
  • the black extra large-capacity off-carriage ink tank denoted by reference numeral 6-3 is an ink tank having a width of 20 cm, a depth of 20 cm, and a height of 2 cm, it is 800 cc and can print 16,000 sheets. Since the ink tank is thin, it can be arranged in two stages.
  • the ultra-large capacity off-carriage ink tank for YMC colors indicated by No. 6-4 is 400 cc if an ink tank having a width of 10 cm, a depth of 20 cm, and a height of 2 cm is capable of printing 8,000 sheets of each color. .
  • the present invention has been mainly described for an inkjet recording apparatus as a consumer product, and its application to a business use printer has also been introduced. It can also be applied to large format printers, professional photographic printers, or industrial printers that may be costly. And even portable printers can have a significant effect if you use them, depending on your design goals.

Landscapes

  • Ink Jet (AREA)
PCT/JP2013/059547 2012-03-30 2013-03-29 インクジェット記録装置 WO2013147167A2 (ja)

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JP2012083007A JP5994043B2 (ja) 2012-03-30 2012-03-30 インクジェット記録装置
JP2012-083007 2012-03-30

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US10696054B2 (en) 2017-10-24 2020-06-30 Seiko Epson Corporation Recording apparatus, liquid storage unit, and medium accommodation unit

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Publication number Priority date Publication date Assignee Title
JP2015205437A (ja) 2014-04-18 2015-11-19 船井電機株式会社 プリンタ
JP7091753B2 (ja) * 2017-10-20 2022-06-28 セイコーエプソン株式会社 液体噴射装置
JP7056177B2 (ja) * 2017-10-24 2022-04-19 セイコーエプソン株式会社 記録装置、液体格納ユニット、及び媒体収容ユニット

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JP3991993B2 (ja) * 2001-11-12 2007-10-17 セイコーエプソン株式会社 液体噴射装置
JP2010052359A (ja) * 2008-08-29 2010-03-11 Sii Printek Inc 液体噴射記録装置及び液体噴射記録方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10696054B2 (en) 2017-10-24 2020-06-30 Seiko Epson Corporation Recording apparatus, liquid storage unit, and medium accommodation unit

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JP2013212602A (ja) 2013-10-17
JP5994043B2 (ja) 2016-09-21

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