TW592989B - Inkjet pen - Google Patents

Abstract

An inkjet pen. The inkjet pen includes a reservoir, a bag, a pressure plate, and an elastic member. The reservoir includes a narrow gap, and maintains a back pressure within a desired range. An ink is stored in the reservoir, and have a surface tension in the narrow gap so that the ink cannot leak out of the reservoir from the narrow gap. The bag is disposed in the reservoir, and communicates with outside the reservoir so as to expand inside the reservoir. The pressure plate is disposed in the reservoir and adjacent to the bag so as to move in the reservoir. The elastic member is disposed in the reservoir and abutted by the pressure plate so as to limit the motion of the bag. When the back pressure in the reservoir increases, the pressure plate is pressed by the bag due to the expansion of the bag, and the surface tension in the narrow gap by the ink is removed by the surrounding air. Thus, the surrounding air enters into the reservoir through the narrow gap so as to reduce the back pressure in the reservoir.

Description

592989

V. Description of the invention (l) [Technical field to which the invention belongs] In particular, the present invention relates to an inkjet print head which can greatly reduce assembly time and parts [prior art] In the printer's inkjet printhead, the negative pressure of the inkjet printhead is mainly used, that is, the pressure of the larger air pressure is slightly lower in the cali ink storage body, so that it is stored in the general environment, so as not to Ink leakage has occurred. However, when the inkjet printhead starts to perform the inkjet operation, the ink in the ink storage body of the inkjet printhead gradually decreases. Since the inkjet printhead belongs to an air-tight space, the pressure in the ink storage body will follow the internal ink. Reduce and decrease, so a pressure control device needs to be set in the inkjet print head to control the negative pressure within a certain range. Among the currently known inkjet printheads, such as the pressure control device of the inkjet printhead proposed by U.S. Patent No. 55 2603 (), refer to Figures 1 and 2, which are mainly steel balls or plastic balls 106 is placed in the cylindrical groove body 104 of the ink storage body 102, and a plurality of convex ribs 108 of the inner edge of the cylindrical groove body 104 are in contact with the steel balls 106 to form a plurality of minute gaps 110. When the negative pressure in the ink storage body 102 rises to 25 mbar, the external atmospheric pressure breaks through the surface tension of the internal ink in a small gap 丨 i 〇, and the air intake adjusts the pressure in the ink storage body 102 to achieve a pressure balance When 'stop the intake action. However, the size of the aforementioned small gap 1 10 is not easy to control, that is, the dimensions of the outer diameter of the steel ball 106 and the inner diameter of the groove body 104 are not easy to be manufactured to a desired size, so that the minute gap 1 1 〇The characteristics may not be achieved; in addition, when the steel ball 106 is assembled in the tank body 104, a certain assembly is also required.

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592989 V. Description of the invention (2) Time. Also, in U.S. Patent No. 62 1 3598, another pressure control device for an inkjet print head is proposed. As shown in FIG. 3, the air bag 416 is connected through the air bag connection hole 4 1 8 connected to the atmosphere, so that The outside air smoothly flows into the air bag 416 in the inkjet print head, and the air bag 416 expands. At this time, the spring 414 is compressed at the same time. When the compressed distance reaches the side plate 412 to the spring 33, the inkjet printing The negative pressure in the head also reaches a certain negative pressure value. At this time, the outside atmosphere smoothly pushes the steel balls 320 through the air inlet 340, so that the air enters the inkjet print head, and the negative pressure in the inkjet print head is reduced. small. After the negative pressure in the inkjet print head is reduced, the air bag 416 no longer expands, and the spring 414 reduces the amount of compression, so that the reed / 330 returns to the original position where the steel ball 320 was pressed. The internal pressure is continuously maintained within a fixed pressure range. However, the assembling process of the above inkjet print head is extremely complicated. The bean contains a sheet metal shaped reed 330 which is thermally fused to the bottom of the ink storage body 400, so that it presses the steel ball 320 of the bubble generator with force, because it is in the storage. w female touch ". 2M floor 々, the bottom of the broken ink body 4 0 0 'so it is not easy to place it in the position when assembling. And soil & In addition, the spring 414 pre-compressed by your early air bag 416 assembly The stainless steel side plate 4 1 2 which is used for fixing and is used for fixing is also installed in the shoe of the ink storage body 4 00 at the same time with low reliability. The "private" process is time-consuming [inventive content In view of this, it is an object of the present invention to provide an assembly time and parts that can be significantly reduced. Its pressure adjustment Another object of the present invention is to provide an inkjet print head with an air intake structure and an ink storage body integrally formed. '

592989 V. Description of the invention (3) According to the present invention, an inkjet print head is provided, which includes an ink storage body, an air bag, a pressure plate, and an elastic device; wherein the ink storage body has an air inlet gap hole, and A negative pressure is maintained therein, and an ink is contained therein. The size of the air intake gap hole causes the ink to have a surface tension in the air intake gap hole, so that the ink does not leak from the air intake gap hole to the ink storage body. Outside; the air bag communicates with the ink storage body and is expandably disposed in the ink storage body. The pressure plate is adjacent to the air bag and is movably disposed in the ink storage body. The elastic device is in contact with the pressure plate. The method is set in the ink storage body to limit the movement of the air bag. When the negative pressure in the ink storage body rises, the air bag expands and compresses the pressure plate, and the external air breaks through the surface tension of the ink in the air intake gap hole. , And enter the ink storage body from the air inlet gap hole to reduce the negative pressure in the ink storage body. In a preferred embodiment, the width of the air intake clearance hole may be 0.05 to 0.1 mm, and preferably, the width may be 0.06 mm. In another preferred embodiment, the ink storage body has a first end portion and a second end portion, and an air-intake gap is formed between the first end portion and the second end portion.

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592989 V. Description of the invention (5) The limb is welded to the ink storage body by hot melt processing. Obviously, the above and other objects, features, and advantages of the invention can be described in more detail as follows-the preferred embodiment "and the accompanying drawings, as the" embodiment "of the first embodiment. -5a and 5b are drawings showing a first embodiment of the inkjet print head of the present invention. In this embodiment, the inkjet print head 200 includes an ink storage book, an air bag 220, a pressure plate 230, and an elasticity. Device 240.

The storage body 2 1 0 is used for accommodating an ink therein, and maintains a negative pressure therein, and has an air inlet gap hole 2 丨 1 at its bottom, a first end portion 212, and a second end. A portion 213, wherein the first end portion 212 has a first surface 212 facing the inside of the ink storage body 210, and the second end portion 213 has a second surface 2 3 facing the outside of the ink storage body 210, and The air intake gap hole 2 11 is formed between the first surface 2 1 2 and the second surface 2 1 3; In addition, the ink storage body 2 1 0 is provided with a first opening 2 1 5 at the top.

It should be understood that the size of the air intake gap hole 211 enables the ink in the ink storage body 2 1 0 to generate a surface tension in the air intake gap hole 2 1 1 so that the ink does not leak from the air intake gap hole 2 1 1 Outside the ink storage body 21, the width w of the air-intake gap hole 211 is preferably between 0.05 and 0.5 mm, and most preferably, the width is 0.06 mm. The air bag 220 has a second opening 221 that communicates with the first opening 2 1 5 of the ink storage body 210, thereby communicating with the outside through the ink storage body 2 1 0 and is provided in the ink storage body 2 in an expandable manner. Within 1 〇.

0338-A20010TWF (Nl); 08-920056; tungming.ptd Page 10 592989 V. Description of the invention (6) The pressure plate 230 is adjacent to the air bag, and is arranged in the ink storage body 210 in a manner, and the elastic device 240 is used for operation. ^, Provided in the ink storage body 21G to restrict the contact of the force plate 23G is that the elastic device 240 may be a spring. ^ For the operation of the bag 220, it is necessary to understand the operation principle of the inkjet print head 200 of the present embodiment, and its operation principle. The structure is as described above. ’The following description

When the inkjet print head 200 performs the inkjet operation, the negative pressure in the ink body 21 is increased. Since the air bag 220 passes through the second opening 2222, the first opening 2 ^, and the atmospheric air bag 220, the The negative pressure in the ink main body 21 rises and expands, and presses the pressure plate 230. When the internal negative pressure of the ink storage body 21 continues to rise, the pressure difference between the atmospheric pressure (outside air) and the internal pressure of the ink storage body 21 reaches the surface tension of the ink in the air intake gap hole 2 1 1, the external air It is replenished into the ink storage body 2 10 from the air inlet gap hole 2 11 to reduce the negative pressure in the ink storage body 2 10 and maintain the negative pressure value in the ink storage body 2 1 0 within a negative pressure range. . After comparing this embodiment with the inkjet print head in US Patent No. 5 2 6 0 30, it can be seen that, because the shape of the air inlet gap hole in this embodiment is substantially rectangular, it does not resemble the conventional ring shape. Generally, its size measurement is easy.

In addition, the inkjet print heads of this example and U.S. Patent No. 62 1 3598 are compared, and the results are collated in the following table.

0338-A20010TWF (Nl); 08-920056; tungming.ptd Page 11 592989 V. Description of the invention (7) US Patent No. 6213598 in this example ^ 1 set of steel balls for reed molds ------ 1 fe assembly time -_ 15 seconds fe Assembly reed loose failure ~ 2.5% chance of occurrence JmT No ultrasonic welding causes steel 2 ~ 3% chance of falling off without beads -__ As can be seen from the table above, this bebe example is due to the air gap clearance system. Formed on the ink storage body '彳 Avoid the combination error caused by the assembly time of the traditional inkjet print head.' This can not only greatly reduce the related components and man-hours required for the assembly process', but also does not affect the required Print quality. In addition, in the mold making of the inkjet print head of this embodiment, the male mold core and the female mold core can be processed by a precision mold bed respectively, and the processing size of the mold is very easy to control. The shrinkage rate of the plastic injection is about 4 · 5/1 0 0 ~ 6/1 000, so the size of the injection air gap hole can be controlled between 0 · 06 ~ 0 · 08mm. Second Embodiment FIG. 6 shows a second embodiment of the inkjet print head of the present invention.

0338-A20010TWF (Nl); 08-920056; tungming.ptd Page 12 592989 V. Description of the invention (8) ^ In the embodiment, the inkjet print head 2000a includes an ink storage body 2103, a pressure adjustment That is, the air intake structure 250a, an air bag 220, a pressure plate 230, and an elastic device 240. It should be understood that the same configuration as the first embodiment is omitted and its description is omitted and the same symbols are used. This embodiment is different from the first embodiment in that the air-intake clearance hole 25 1 a is formed on the pressure-adjusted air-intake structure 25 〇a other than the ink storage body 21 oa, that is, the air-intake clearance hole and It is not limited to be integrally formed on the ink storage body as in the first embodiment.

It should be understood that the pressure-adjustable air intake structure 250a can be provided on the ink storage body 2 1a in a variety of ways. For example, when the pressure-adjustable air intake junction 250a is made of plastic, it can be obtained by Injection molding and integral molding. On the wound body 21〇a, or when the pressure-adjusting air intake structure holder is integrated with metal, the pressure-adjusting air intake structure 250a can be injection-molded on the ink storage body 2 1 0a On the mold, or on the ink body 2i〇a by mistake. The upper part of the hunter was exposed to heat due to heat ... Because this embodiment does not need to greatly reduce the knowledge required during assembly, related components and man-hours such as steel balls need to be set. Third Embodiment Figures 7, 8a, and 8b show examples of the present invention. In this embodiment, the third implementation of the inkjet print head at January t-air bag,-pressure plate 230, = ^ = ^ ^ It is the same configuration as the first embodiment. The symbol 240 should be understood. ] Make the name omitted and indicate the same

592989 V. Description of the invention (9) This embodiment is different from the first embodiment in that the ink storage body 2b has an air inlet gap hole 2 1 1 b, a first end portion 2 1 2 b, and a first Two end portions 213b, where the first end portion 212b has a third surface 212b 'facing the second end portion 213b, and the first known portion 213b has a fourth surface 213b' facing the first end portion 212b, and The air intake clearance hole 21 lb is formed between the third surface 212 b ′ and the fourth surface 213 b ′. It can be known from the structure of this embodiment that the formation manner of the air intake gap hole is not limited to the first embodiment, and because the difference between this embodiment and the first embodiment lies only in the formation manner of the air intake gap hole, this embodiment can also The same effect as that of the first embodiment is achieved. μ The fourth embodiment 9a, 9b is a diagram showing the present invention. In this embodiment, the inkjet print head 2000c bag 2 2 0, a pressure plate 23 0, and the same as the first embodiment Composition of ellipsis. This embodiment and the first embodiment do not have an air intake clearance hole 21 lc 213c, wherein the first end portion 212c faces the inclined surface 2 1 2 c ′, and between the air intake clearance hole 2 11 and the second end portion 2 13c. It can be known from the structure of this embodiment that it is limited to the first embodiment, and because the fourth embodiment of the actual inkjet print head includes an ink storage body 210c and an aeroelastic device 240, it should be understood that its description is marked with The same sign is the same: the surface of the ink storage body 210c having an end portion 212c and a second end portion 213c may be a c-type formed on the first end portion 2 12c and the air gap clearance hole. The difference between the embodiment and the first embodiment is not only

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The reason for the formation of the air-intake gap holes is that, too, the u + μ embodiment can also achieve the same effect as the first embodiment. Fifth embodiment

Figures 10a, 10b, 10c, and 10d show a fifth embodiment of the inkjet printhead of the present invention. In this embodiment, the inkjet printhead 200d includes an ink storage body 210d and an air bag 220. , An S force plate 230, and an elastic insertion 2 4 0, it should be understood that the same configuration as the first embodiment is omitted, and the same reference numerals are assigned; in addition, it should be noted that The figure and the figure 0d are sectional views drawn along different section lines, and the figure 10d is a section taken along the support frame 21 3d. This embodiment differs from the first embodiment in that the ink storage body 2 10d has a base 212d, a support frame 213d, a blocking piece 214d, and an air intake gap hole 21 Id at the bottom thereof, among which the support frame 21 3d connects the base 21 2d and the barrier sheet 21 4d, and the air-intake gap hole 21 Id is formed between the base 21 2d and the barrier sheet 2 1 4 d and is annular.

In detail, in this embodiment, the required plastic material is mainly introduced into a required annular air inlet clearance hole 2 1 1 d structure through the design of the support frame 2 1 3d. This. On the other hand, in the mold I, the mold core is mainly processed by lathe, and then discharge processing is performed. After discharge processing, grinding is completed. In addition, the air gap hole is completed by grinding. It can be known from the structure of this embodiment that the formation manner of the air intake gap hole is not limited to the first embodiment, and because the difference between this embodiment and the first embodiment lies only in the formation manner of the air intake gap hole, this embodiment can also Reach and cap

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592989 V. Description of the invention (11) The same effect of an embodiment. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the scope of the attached patent application.

0338-A20010TWF (Nl); 08-920056; tungming.ptd Page 16 592989 Brief description of the diagram 1 '2 is a pressure control device for an inkjet print head card proposed by US Patent No. 5526 0300 Schematic diagram; Figure 3 is a schematic diagram of an inkjet card straight pressure control device proposed by US Patent No. 6 2 1 3 5 98; Figure 4 is a first implementation of the inkjet print head of the present invention For example, Figure 5a is an enlarged perspective view of part a in Figure 4; Figure 5b is an enlarged view of part a in Figure 4; Figure 6 is a view of the inkjet print head of the present invention Schematic diagram 7 of the second embodiment is a schematic diagram of the third embodiment of the inkjet print head of the present invention. Schematic diagram 8a is an enlarged perspective view of part a in FIG. 7; diagram 8b is diagram 7 The enlarged view of part a in Figure 9; Figure 9a is a schematic diagram of the fourth embodiment of the inkjet print head of the present invention. Figure 9b is an enlarged view of Part A in Figure 9a; Figure 10a This is a schematic diagram of the fifth embodiment of the inkjet print head of the present invention; FIG. 1 Ob is a bottom view of a part of the inkjet printhead in FIG. 10a; In the b - an enlarged portion of FIG.; FIG. 10d and a second line of FIG i〇b is A~A first, a partial sectional view. Symbol Description:

03 38-A20010TW (N1); 08-920056; t ungm i ng. Ptd page 17 592989 Brief description of the drawings 1 0 2 ~ Ink storage body 104 ~ Cylindrical groove 1 0 6 ~ Steel ball 1 0 8 ~ Raised rib 200c , 200d ~ Inkjet print head 210c, 210d ~ Ink storage body 2 11 d ~ Air intake gap hole 2 1 2c ~ First end 1 1 0 ~ Micro gap 200, 200a, 200b 210, 210a, 210b 211, 211b , 211c 212, 212a, 212b 212 '~ first surface 212b' ~ third surface 2 1 2c '~ slope 212d ~ base 213c ~ second end 213, 213a, 213b 213' ~ second surface 213b '~ Four surfaces 213d ~ support frame 214d ~ blocking sheet 2 1 5 ~ first opening 220 ~ air bag 2 2 1 ~ second opening 2 3 0 ~ pressure plate 240 ~ elastic device 2 5 0 a ~ pressure regulating air intake structure

0338-A20010TW (Nl); 08-920056; tungmin〇Ptd Page 1H 592989 Brief description of the drawing 2 5 1 a ~ Air inlet clearance hole 30 0 ~ Cassette 320 ~ Steel ball 330 ~ Reed 340 ~ Air inlet 4 1 2 〜Side plate 414 ~ Empire 416 ~ Air bag 4 1 8 ~ Connecting hole

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Claims (1)

592989 VI. Application patent scope 1 · An ink storage maintains a negative pressure size so that the ink will not be placed from an air bag in the ink storage, a pressure ink storage body, and an elastic body, which is used to force the surface of the pressure plate. Tension, the ink storage body 2. such as Shen air gap hole 3. such as Shen air gap hole 4. Rushen ink body has the second end 5. Rushen inkjet print head, including: the body, has an inlet An air gap hole, and an ink is contained in the ink storage body, wherein the water of the air gap hole has a surface tension in the air gap hole, so that the air gap hole leaks into the Outside the ink-storing body; in communication with the outside of the ink-storing body to set the body in an expandable manner; a plate adjoining the airbag and being movably disposed in the body; and a device to abut the pressure plate When the negative pressure in the ink storage body rises, the air bag expands and pressures, and the outside air breaks through the ink in the air gap hole. Enter the air gap hole from the A body of ink in order to reduce the negative pressure within. The inkjet print head described in item 1 of the patent scope, wherein the feed width is 0.05 ~ 0.1 mm. The inkjet print head described in item 2 of the patent scope, wherein the feed width is 0.06mm. The inkjet print head according to claim 1, wherein the first end portion and the first end portion are stored, and the air inlet gap hole is formed between the first end portion and the first end portion. The inkjet print head according to item 4 of the patent, wherein the first end portion has a first surface facing the inside of the ink storage body, and the second 03 38-A2001OTWF (N1); 08-920056; t ungm i ng.ptd page 20 592989 VI. The end of the patent application has a second surface facing the outside of the ink storage body, and the gap is formed in the Between the first surface and the second surface. ， 内 间 山 6 · The inkjet print head described in item 4 of the scope of patent application, wherein one end portion has a position facing the second end ^ r. Eighth has one, 7 facing the first end portion D >, and the second end portion is formed between the third surface and the fourth surface, and the air-inlet gap hole is formed between four surfaces of theta. Wherein the first where the storage and the support 7 · As the scope of the patent application 筻-the end portion faces the inkjet print head described in the second end J4 / 8. If the scope of the patent application H surface is-bevel. The shape of the air gap hole is rectangular. The inkjet print head 9 described in the negative. The ink body according to the first patent claim has a base, and an inkjet print head holder as described above connects the base and the blocking sheet / collector, and a catcher. Between the bottom of the sheet and the barrier sheet. The air gap hole is formed in the base 10, such as the ninth process of the patent application, where the sacrificial machine female, π. Wherein the storage has a black spray stomach described in connection with the first opening Ink head, wherein the shape of the air gap hole is annular. The inkjet print head described in item 11. According to the scope of the patent application, the ink body is provided with a first opening, and the inkjet print head has a second opening. Hai * 1 贝 1 2 · If the first device in the scope of patent application is a spring 1 3 ·-an inkjet print head, including an ink storage body, in which the healthy black ink is contained; < maintenance within the hair-factory Pay-negative pressure and containment 0338-A20010TWF (Nl); 08-920056; tungming.ptd No. 21 Tribute 592989 VI. Patent application scope-A pressure regulating air intake structure is provided on the ink storage body and has an air intake gap hole, in which the air intake The size of the gap hole allows the ink to have a surface tension in the air intake gap hole, so that the ink does not leak from the air intake gap hole outside the ink storage body; an air bag communicates with the outside of the ink storage body And is arranged in the ink storage body in an expandable manner; a pressure plate adjacent to the air bag is movably arranged in the ink storage body; and an elastic device is arranged to abut the pressure plate. The method is arranged in the ink storage body to restrict the movement of the air bag; wherein when the negative pressure in the ink storage body rises, the air bag expands to compress the pressure plate, and the outside air breaks through the ink in the The surface tension in the air gap hole enters the ink storage body from the air gap hole to reduce the negative pressure in the ink storage body. 14. The inkjet print head according to item 13 of the scope of patent application, wherein the pressure-regulating air intake structure is integrally formed on the ink storage body by injection molding. 15. The inkjet print head according to item 13 of the scope of patent application, wherein the pressure-regulating air intake structure is made of metal. 16. The inkjet print head according to item 15 of the scope of patent application, wherein the pressure-regulating air intake structure is disposed on the ink storage body by injection molding. 1 7. The inkjet print head according to item 15 of the scope of patent application, wherein the pressure-adjusting air intake structure is welded to the ink storage body by hot-melt processing. 0338-A20010TWF (N1); 08-920056; t ungm i ng.p t d p.22 592989 ...... 6. The scope of patent application. 05 · 〇. Lmm。 1, 18 · As claimed in the scope of patent applications No. 13 + since the width of the air intake gap is 0. 05 ~ 〇. Lmm. a spoon of inkjet print head, 19 · As unclearly recognized in item 18 of the scope of the application patent ^ The width of the air gap hole is 0 · 06mm. The inkjet printing head described in the inkjet printing head described in Item 13 of the scope of application patent No. 13 has a first inkjet printhead and a second inkjet printhead and the second inkjet printhead. The air gap hole 邛 is formed between them, and an ink _print head facing the inside of the ink storage body is provided at the second end of the “21 · Such as the scope of the patent application No. 20, wherein the two ends have A surface facing the exterior of the ink storage body, and the first gap hole is formed on the first surface and the second surface, and the air inlet is-22 · as described in the scope of the patent application No. Between the surfaces, one end portion has a third ink head facing the second end portion, wherein the portion has a fourth surface & surface facing the first end portion, and the second The end is formed between the third surface and the fourth surface. The surface of the air intake clearance hole 23. The surface of the first end portion facing the second end portion according to item 20 of the patent application scope is- Inclined surface P 硕 24 · As described in item 13 of the scope of patent application. The shape of the air gap hole is rectangular. 25. The ink storage body according to item 3 of the scope of the patent application has a base, a support frame, and P. Song .. The floor frame connects the base and the blocking piece, and the air intake 5 push piece 'and Between the substrate and the barrier sheet. :: The hole system is formed in the 0338-A20010TWF (Nl); 08-920056; tungming.ptd page 23 592989 6. Application for patent scope 2 6 • If the scope of patent application is No. 25 In the inkjet print head, the shape of the air-intake gap hole is annular. 2 7. The inkjet print head according to item 13 of the scope of patent application, wherein the ink storage body is provided with a first opening, and The air bag is provided with a second opening communicating with the first opening. 2 8. The inkjet print head according to item 13 of the scope of patent application, wherein the elastic device is a spring. 0338-A20010TWF (Nl); 08-920056; tungming.ptd Page 24