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Die apparatus, method for producing perforated work plate, perforated work plate, liquid-jet head and liquid-jet apparatusRelated Patent Categories: Metal Working, Method Of Mechanical Manufacture, Fluid Pattern Dispersing Device Making, E.g., Ink JetDie apparatus, method for producing perforated work plate, perforated work plate, liquid-jet head and liquid-jet apparatus description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060236536, Die apparatus, method for producing perforated work plate, perforated work plate, liquid-jet head and liquid-jet apparatus. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The entire disclosure of Japanese Patent Application Nos. 2005-092286 filed Mar. 28, 2005 and 2005-096909 filed Mar. 30, 2005 is expressly incorporated by reference herein. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to a die apparatus for boring fine holes, which are through-holes, in an ultrathin plate as a work plate. The die apparatus is preferred for application to the preparation of a filter for a liquid-jet head for trapping foreign matter contained in a liquid to be supplied to a pressure generating chamber of the liquid-jet head. [0004] The present invention also relates to a method for producing a perforated work plate having fine holes, which are through-holes, bored in an ultrathin plate as a work plate. This method is preferred for application to the production of a perforated ultrathin plate for use as a filter for a liquid-jet head for trapping foreign matter contained in a liquid to be supplied to a pressure generating chamber of the liquid-jet head. [0005] The present invention also relates to a perforated work plate having fine holes, which are through-holes, bored in an ultrathin plate. This perforated work plate is preferred for application to a filter for a liquid-jet head for trapping foreign matter contained in a liquid to be supplied to a pressure generating chamber of the liquid-jet head. [0006] The present invention further relates to a liquid-jet head including a filter having fine holes, which are through-holes, bored in an ultrathin plate, the filter being used as a filter for a liquid-jet head, and a liquid-jet apparatus including the liquid-jet head. [0007] 2. Description of the Related Art [0008] Liquid-jet apparatuses are designed to jet various liquids, and an ink-jet recording apparatus, in particular, is used widely. The ink-jet recording apparatus has an ink-jet head for ejecting ink droplets, which are liquids, through a plurality of nozzle orifices. By the action of the ink-jet head, ink droplets are caused to impinge on the surface of a recording sheet or the like, which is a medium, thereby printing images or characters thereon. [0009] In the ink supply passage provided in the ink-jet head, a flat plate-shaped filter is disposed for removing foreign matter intruding into ink, namely, fine pieces of synthetic resin or air bubbles remaining within the supply passage for some unknown cause. As such a filter, a twilled filter or a nonwoven fabric filter is usually adopted (see Japanese Patent Application Laid-Open No. 1999-10904). [0010] However, the twilled filter has a low opening rate and involves a great pressure loss (passage resistance), so that it has been customary practice to increase the area of the filter. This practice, however, increases the size of the filter, making it difficult to downsize the ink-jet head. Moreover, the shape of the passage within the filter is so complicated that the pressure loss varies with each filter. Accommodating such variations within the tolerance range is difficult, thereby destabilizing the ability to trap foreign matter. Furthermore, the edge portion of the filter is frayed, thus causing a tendency toward damage to components, for example, during the step of assembling the filter. This poses difficulty in handling of the filter, and brings disadvantage to costs. With the nonwoven fabric, fine pieces of fiber are likely to flow downward together with ink from the filter, deteriorating reliability. [0011] Under these circumstances, it has been contemplated to use a filter having many fine holes (for example, holes of 15 .mu.m in diameter) formed in an ultrathin metal plate (for example, SUS plate of 10 to 20 .mu.m in thickness) by punching. By using as the filter such an ultrathin metal plate having many fine holes formed therein, it becomes possible to decrease the pressure loss, ensure an adequate flow rate of ink, and impart a stable function of trapping foreign matter. [0012] In preparing the ultrathin metal plate having many fine holes formed therein, it is conceivable to use a die apparatus comprising an upper die (punch) having the same diameter as that of the fine hole, and a lower die (die) having a depression (for example, a hole having a diameter of 16 to 17 .mu.m) slightly larger in diameter than the fine hole, and pass the punch through the ultrathin metal plate with the use of the depression of the die as a pad to carry out punching. [0013] To allow the ultrathin metal plate to function as a filter, it is necessary to provide the ultrathin metal plate with many of the fine holes (for example, several tens of thousands of the holes/cm.sup.2), thus requiring that fine depressions be formed in the die. In actual manufacturing, many of the fine holes need to be punched at a time, and many of the fine depressions should be formed in the die. Moreover, alignment of the punch and the die (concentricity 1 .mu.m or less) is difficult. [0014] It presents a tremendous difficulty to form many such fine depressions in the die, or to perform fine alignment corresponding to concentricity of 1 .mu.m or less. Actually, serious difficulty is encountered in preparing an ultrathin metal plate having many fine holes formed therein by use of the punches and the die having the depressions. Besides, it is expected that the depressions of the die will be clogged with slugs, or the depressions will be covered with slugs, whereby tiny damages to the die may be caused. [0015] Accordingly, no technologies have been established for applying an ultrathin metal plate, which has many fine holes formed therein, to a filter for a liquid-jet head. SUMMARY OF THE INVENTION [0016] The present invention has been accomplished in the light of the foregoing situations. It is an object of the present invention to provide a die apparatus capable of easily preparing an ultrathin metal plate which is a work plate having many fine holes formed therein. [0017] Also, the present invention has been accomplished in the light of the above-mentioned situations. It is another object of the present invention to provide a method for producing a perforated work plate, which can easily prepare an ultrathin metal plate being a work plate having many fine holes formed therein. [0018] Moreover, the present invention has been accomplished in the light of the aforementioned situations. It is still another object of the present invention to provide a perforated work plate, which minimizes a pressure loss and ensures an adequate flow rate of ink, which can perform a stable function of trapping foreign matter, and which can be applied as an easy-to-handle filter for a liquid-jet head. [0019] Furthermore, the present invention has been accomplished in the light of the aforementioned situations. It is a further object of the present invention to provide a liquid-jet head including a liquid-jet head filter, which minimizes a pressure loss and ensures an adequate flow rate of ink, which can perform a stable function of trapping foreign matter, and which is easy to handle; and a liquid-jet apparatus equipped with the liquid-jet head. [0020] A first aspect of the present invention for attaining the above object is a die apparatus for boring a through-hole in a work plate, comprising a lower receiving die, a punch, and a flexible member provided between the lower receiving die and the punch, and wherein the punch is passed through the work plate placed on the flexible member to press a punched-out piece into the interior of the flexible member, thereby boring the through-hole in the work plate. [0021] In the first aspect, the punched-out piece is pressed into the interior of the flexible member to bore the through-hole. Thus, there is no need to form the depression for receiving the punch. Nor is it necessary to align the depression with the punch. Accordingly, the work plate having many through-holes formed therein can be easily prepared. [0022] A second aspect of the present invention is the die apparatus according to the first aspect, characterized in that the flexible member is a polymer material. Continue reading about Die apparatus, method for producing perforated work plate, perforated work plate, liquid-jet head and liquid-jet apparatus... Full patent description for Die apparatus, method for producing perforated work plate, perforated work plate, liquid-jet head and liquid-jet apparatus Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Die apparatus, method for producing perforated work plate, perforated work plate, liquid-jet head and liquid-jet apparatus patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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