WO1997036174A1 - Appareil de mesure d'une charge statique dans une encre en poudre et procede correspondant - Google Patents

Appareil de mesure d'une charge statique dans une encre en poudre et procede correspondant Download PDF

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Publication number
WO1997036174A1
WO1997036174A1 PCT/JP1996/000758 JP9600758W WO9736174A1 WO 1997036174 A1 WO1997036174 A1 WO 1997036174A1 JP 9600758 W JP9600758 W JP 9600758W WO 9736174 A1 WO9736174 A1 WO 9736174A1
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WO
WIPO (PCT)
Prior art keywords
toner
charge amount
developer
charge
weight
Prior art date
Application number
PCT/JP1996/000758
Other languages
English (en)
Japanese (ja)
Inventor
Atsushi Onose
Toru Miyasaka
Akira Shimada
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/JP1996/000758 priority Critical patent/WO1997036174A1/fr
Priority to JP53421797A priority patent/JP3567463B2/ja
Publication of WO1997036174A1 publication Critical patent/WO1997036174A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/24—Arrangements for measuring quantities of charge
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability

Definitions

  • the present invention relates to an apparatus for measuring the characteristics of a dry developer used for electrophotography and electrostatic recording, and more particularly to a measuring apparatus for measuring the amount of charge, the amount of adhesion and the amount of charge.
  • the developer used in the electrophotographic development process includes a one-component developer using a toner alone and a two-component developer using a carrier in addition to a toner.
  • Most printers and copiers that use electrophotography use two-component developers for development.
  • the charge amount of the toner tends to change depending on the mixture ratio of the toner and the carrier and the environment in which the toner is placed, so that the developed amount of the developer becomes unstable, and the image density tends to change. Was. Therefore, it is necessary to measure the charge amount every moment to know the characteristics of the developer.
  • a blow-off method disclosed in JP-A-52-84779 is frequently used.
  • a metal container called a Faraday cage that can measure the amount of charge is provided with two ports, one of which is closed with a mesh that does not pass through the carrier and passes through the toner, and the developer is put inside: air from the other side
  • an inert gas such as nitrogen gas is introduced, the toner in the developer is removed from the container, and the amount of charge is measured from the difference between the amount of charge and the difference in weight generated at that time.
  • a method of removing air by sucking air is described.
  • JP-A-4-19078 As a device for measuring the charge amount of a one-component developer, there is a method disclosed in JP-A-4-19078.
  • the toner is sucked from the toner carrier using the suction nozzle, and the charge amount of the toner carrier before and after suctioning the toner is used to determine the charge amount of the toner carrier, and the weight change of the filter inside the suction nozzle. Calculates the toner charge by measuring the weight of the toner.
  • An object of the present invention is to provide a charged amount measuring device capable of measuring a charged amount with high accuracy despite being a small measuring device. Disclosure of the invention
  • the present invention is a charge amount measuring device for accurately and efficiently measuring the charge amount of a developer, which measures a suction unit for sucking a toner in a developer and a charge amount generated by sucking toner.
  • a configuration including a charge amount measurement unit and a weight measurement unit configured to measure a weight difference of a developer that is lightened by removing the toner, wherein a capture unit that captures the toner or a developer holding unit that retains the developer is used. It is what it was. If the weight is always kept constant and the measurement is performed with the same suction time or the like, the measured charge amount can be obtained as the toner charge amount.
  • FIG. 1 is a diagram showing an overall configuration of an embodiment of the present invention
  • FIG. 2 is a diagram showing an example of a conventional blow-off method
  • FIG. 3 is a diagram showing a developer holding means of the present invention.
  • FIG. 4 is a view showing an embodiment
  • FIG. 4 is a view for explaining a measurement principle using the developer holding means of the present invention
  • FIG. 5 is a drawing of a suction nozzle and a suction means which are capture means of the present invention.
  • FIG. 6 is a view showing an embodiment of a suction port
  • FIG. 6 is a view for explaining a measurement principle using a suction nozzle
  • FIG. 7 is an external view of the present invention in which a charge amount measurement means suction means is combined;
  • FIG. 8 is a view showing an embodiment in which the weight measuring means and the charge amount measuring means of the present invention are combined.
  • a two-component developer is mainly composed of a toner and a carrier.
  • toner has a particle size of about 6 to 12 ⁇
  • a carrier has a particle size of about 50 to 120 ⁇ . The child's thing is used.
  • a compressed gas 5 is put into a conductor container 4, and toner 1 and carrier 2 on the mesh 3 are separated and toner 1 is removed.
  • the accumulated charge is temporarily stored in the capacitor 6 and measured by the voltmeter 7.
  • the developer holding means of the present invention comprises a developer container 8, a mesh 3, and a mesh fixing means i1, and uses the mesh 3 to transfer toner and carrier. It measures the amount of charge on the toner by separation.
  • the charge amount (charge-mass ratio, Q / M) can be obtained from the charge amount Q and the weight M. If the weight or volume of the developer to be measured is known, only the measured charge amount can be measured to determine the charge amount. That is, the toner charge amount can be displayed as it is as a value obtained by dividing the measured charge amount by a known constant weight (for example, by dividing by 10 Omg). The following description is based on the assumption that the measured toner weight changes.
  • the toner 1 is in an electrical equilibrium state when mixed with the carrier 2 and the charge amount of the toner cannot be known. Therefore, the developer in the developer container 8 is passed through the mesh 3 to the suction means. The structure is such that toner 1 is sucked by bringing the intake port 15 close and the intake 16 is taken, and the toner 1 and the carrier 2 are separated. Carrier 2 occurs. Now, by making the developer container S and the mesh 3 electrically conductive, the carrier 2 The amount of charge generated in the developer container 8 or the mesh can be induced in the developer container 8 and the amount of charge can be known by measuring the amount of charge by the charge amount measuring means 36. The charge amount can be obtained by measuring the charge amount and weight as described above.
  • the method for determining the weight of the toner is as follows. First, the developer container 8 containing the developer in which the toner and the carrier are mixed is placed on the weight measuring means 40 such as a precision balance and the weight is measured (see FIG. 1). Next, after sucking the toner, the weight of the developer container 8 in which the toner is lost and the carrier remains is measured. From these weight differences, the weight of the toner lost from the developer container 8 by suction can be known. Also, if the weight of the developer container 8 having no developer is weighed, the weight of the developer placed on the developer container 8 can be determined, so that the toner concentration can be determined by comparing with the weight of the toner. it can. In other words, when the toner in the developer placed on the developer container 8 is almost sucked, an accurate measurement value can be obtained.
  • the charge amount can be obtained by calculating the charge amount and the weight as described above.
  • the developer holding means shown in FIG. 4 will be described in detail.
  • the developer container 8 has one surface as an opening. From the opening, a mixed developer such as toner and carrier is put into the developer container 8. Next, the opening of the developer container 8 containing the developer is closed with the mesh 3. Thus, the toner 1 in the developer cannot be removed unless it passes through the mesh 3. Now, the toner 3 can be separated from the carrier 2 by using a mesh 3 having a pore size that allows the toner 1 to pass and the carrier 2 not to pass.
  • Suction means 33 is used to positively separate toner 1 and carrier 2. Specifically, vacuum cleaners and vacuum pumps Or a suction means having a filter as described above.
  • the flow rate is preferably 5 cc / sec or more, depending on the diameter of the suction port. It is preferable to use a suction means that can obtain a flow rate of about 1 to Occ.
  • the mesh 3 needs to have a pore size smaller than that of the carrier 2 and larger than that of the carrier 11. Basically, it needs to be fine enough to prevent Carrier 2 from passing through. Therefore, when selecting the mesh 3, it is necessary to select a mesh 3 that does not pass through more than 90% of the carrier 2, referring to the particle size distribution of the carrier 2. Desirably, we want to select one that remains 96% or more. For example, if the particle size of the carrier 2 is about 100 ⁇ m, a carrier having a pore size of 80 IX m or less is selected. Also, of course, toner 1 has to pass almost all through mesh 3. Specifically, those having a pore diameter of 20 ⁇ to 70 ⁇ are frequently used. For example, # 500 mesh or 635 mesh is good.
  • mesh fixing means 1 i for fixing the mesh 3 to the developer container 8 is provided so that the developer in the developer container 8 does not leak without passing through the mesh 3.
  • a lid with an inner diameter that is approximately the same as the outer diameter of the developer container 8 should be prepared, and a through hole approximately the same diameter as the inner diameter of the developer container 8 should be provided in the center of the lid. This allows the mesh to be sandwiched between the developer container 8 and the lid.
  • the lid, the developer container 8 and the mesh 3 can be fixed by cutting a screw.
  • the container 8 is circular, the production of the developer container 8 is facilitated.
  • the lid and the developer container 8 are too tightly closed, it becomes difficult to reopen the lid. Therefore, it is preferable to perform chamfering or rough surface treatment on the lid and the outer periphery of the developer container 8.
  • the suction nozzle can be moved linearly when sucking the toner, and the toner is uniformly sucked. It's easy to do.
  • the lid may be pressed against the developer container using an elastic member such as a panel panel or a coil spring. If the developer container has a fixed shape such as a rectangle or a circle, a means for scanning the suction port of the suction means is provided, and the toner can be suctioned under almost the same conditions.
  • the width of the holding portion G between the mesh 3 and the developer container 8 and the lid which is the mesh fixing means 11 must be secured. Therefore, the distance between the inner wall 10 of the developer container 8 and the outer wall J of the mesh fixing means 11 is preferably 2 or more. Desirably, the difference between the inner diameter and the outer diameter should be about 4 or more.
  • an O-ring may be inserted in the contact area between them. In this case, the contact between the developer and the O-ring affects the amount of charge of the developer. is there.
  • the developer container is made to have a single opening, and the suction nozzle is made narrower to generate a high-speed airflow to achieve efficient separation of toner and carrier. It is only measured for. This eliminates the need for large pressure equipment, so the equipment can be made smaller and portable.
  • the size of the opening of the developer container 8 is preferably not less than 10 diameters, and is preferably about 25 dragons in diameter. To measure the charge amount with about 1 O mg of toner, 200 mg of developer is required if the toner concentration is 5%. Taking into account the apparent bulk density, a volume of about 0.5 cc is required. Accordingly, the size of the opening of the developer container 8 is preferably 10 or more. Practically, to absorb toner evenly at a shallow depth, a diameter of about 25 doctors with about 4 times the area was good.
  • the developer container 8 is preferably shallow. By making the bottom shallow, in addition to the toner in the developer near the mesh 3, the toner can be sucked from the developer on the bottom surface 9 of the developer container. Also, when suctioning air and toner through the mesh, the shallow bottom causes the air to flow only from around the contact area of the suction nozzle, so the air suction port becomes narrower and more air The speed of the flow can be increased. Specifically, the depth from the mesh 3 to the bottom surface 9 should be 5 mm or less. If the depth is greater than that, it is difficult to suck the tona, and if you try to forcibly suck it, the mesh will be damaged. Ideally, if the depth is less than 2 bandits, the developer can be evenly absorbed.
  • the bottom surface 9 of the developer container opening may have a mortar-like shape with a deeper central portion. This makes it possible to secure an air inflow path when suctioning the toner with the suction nozzle. Further, since the developer put in the developer container can be collected at the center, the developer can be prevented from being mixed into the contact point between the mesh and the developer container.
  • the developer container, mesh, and lid described above should be at least i, and preferably all electrically conductive. In order to reliably capture the lines of electric force due to the charges generated by the developer, it is necessary to surround the developer with as large a surface area as possible.
  • the weight of the developer container 8 including the mesh is preferably less than 100 g. Precision electronic balances with a minimum resolution of 0.1 mg often have a maximum mass of less than 100 g. Therefore, it is preferable that the weight be less than 100 g, ideally 80 g or less. For this purpose, it is preferable to use a thin stainless steel or the like when the developer container is made of aluminum alloy. It is preferable to provide a measurement holder 12 for accommodating the developer container so that the developer container does not move around during measurement. Lowering the part in contact with the developer container one step lowers the lateral displacement. A height of about 1 dragon is sufficient, but depending on the shape of the developer container, increasing the height can reduce the deviation.
  • the holder is provided with a contact electrode 13 for making electrical contact between the charge amount measuring means and the developer container.
  • the charge amount can be measured by placing the developer container 8 on the holding table 12.
  • the contact surface between the holding table 12 and the developer container 8 is preferably made electrically conductive and connected to the charge amount measuring means.
  • Other methods include screwing and clipping wires.
  • the above-mentioned method is preferable for easily making electrical contact: It is better to make a large contact surface in order to secure electrical contact between the developer container 8 and the contact electrode 13. Therefore, while the lower surface of the developing container 8 is usually up to the threaded portion of the outer wall J, the lower surface may be extended to increase the contact surface as shown in FIG. In addition, as shown in Fig.
  • a space 44 is provided in the section, a hole is made in a part of the contact surface between the developer holding means and the holding table, and then the air is exhausted from the exhaust port 45 using suction means to generate a pressure in the internal space. Accordingly, there is a method in which the developer container is sucked from the inside of the holding means, brought into contact with the developer container, and fixed.
  • an electrically conductive portion such as the developer container, mesh, and mesh fixing means
  • a charge is released when a person or the like touches the portion, so a protective cover 14 is provided.
  • the easiest method of electrical insulation is to use an insulating plate such as an acrylic plate to insulate.
  • the electromagnetic shield can be performed by minimizing the insulating member in contact with the conductor and covering the conductor with the conductor at an interval.
  • the protective cover 14 is provided with an opening so that the inlet of the toner suction means can reach the mesh 3.
  • Configuration of the embodiment shown in Fig. 5 has a filter 1 8 capturing Bokuna one therein, sandwiched between the inlet portion 2 1 a conductor container and an exhaust port unit 2 1, filter fixing member 1 9 'To fix the filter.
  • the intake port formed of a conductor has a cylindrical inner cylindrical part 22, and an electrically insulating outer cylindrical part 23 on the outside thereof.
  • the exhaust port 24 is connected to the contact electrode 2 ⁇ , and is connected to the charge measuring means through the connection terminal 27 and the electric wire 28.
  • an elastic electrode member 26 is used to secure electrical connection.
  • Electromagnetic An insulating member 29, an insulating container 30, and a lid 31 thereof are provided in order to perform one operation. These are connected to a hose 32 connected to the exhaust port side of the suction means.
  • the weight of the toner is determined by the following method. Using a suction nozzle 17 containing a filter 18 capable of collecting toner in the developer shown in Fig. 5 and using a suction means to suck the toner, the toner can be accumulated on the surface of the filter 18 . Then, the suction nozzle 17 is removed from the suction port 15, and the weight of the toner is obtained from the weight difference M between the suction nozzle 17 before and after suction by using a weight measuring means 40 such as a precision balance. Attention must be paid to the fact that if a carrier other than toner is collected by a filter, the weight of the toner cannot be determined.
  • the suction nozzle 1 serving as the capturing means can suck the toner 16 together with the air 16.
  • the sucked toner 1 is accumulated on the surface of the filter 18.
  • the electric charge of the toner 1 extends the electric flux H in the direction of the conductor container 20 around the toner 1, and most of the electric flux H can be collected in the conductor container 20. Therefore, an electric charge substantially equivalent to the toner electric charge is induced in the conductor container 20, and the electric charge can be measured by the electric charge measuring means 36 such as an electorometer.
  • the charge amount of the toner is obtained from the difference Q by measuring the charge amount of the conductor container before and after suctioning the toner.
  • the charge amount (charge-mass ratio, Q / M) can be obtained from the charge difference Q and the weight difference M by the above method.
  • the actual weight of the toner attached to the filter is The amount of toner charged can be measured by sucking the toner attached to a predetermined area by measuring the force ',', ie, the toner is attached to a predetermined area. Assuming that the toner amount is constant, the toner amount can be measured from the charge amount measured by moving the suction nozzle in a predetermined range (for example, by moving about 1 O cjn).
  • the filter 18 needs to pass the air carrying the toner and collect most of the toner. Therefore, it is necessary to reduce the pore diameter, and it is desirable that the pore diameter be 3 ⁇ m or less.
  • the toner collection capacity must be at least 95% of the total toner suction amount. If the trapping capacity is lower than this, not only will the measurement error of the toner weight increase, but also the toner that has passed through the filter will adhere to the motor of the suction device and cause a failure. It is desirable to select a filter with a collection capacity of 98% or more.
  • the number of filters 18 is basically one, but the use of a plurality of filters can improve the trapping ability. For example, if two filters with a trapping capacity of 80% are used, a trapping capacity of 96% can be expected.
  • the interval between the filters may be omitted, but the interval of about 1 difficulty does not significantly reduce the air flow.
  • the filter collects toner by clogging and is a consumable item to be replaced. Therefore, it is easier to use inexpensive qualitative or quantitative filter paper than metal mesh, which induces charge and makes it easy to measure the amount of charge.
  • Filters can be of various shapes, but they are easier to handle if they are rounder than rectangles n and have a size of ⁇ ) (the power is ideally around j mra ',', 2 to 200 It is good to use a dragon-sized filter. Specifically, it is good to use filter paper such as (Watman CAT Xo 1001 025, GRADE 1, SIZE 2.5 cm, QTY 400 CI RCLE). The larger the cross-sectional area of the filter, the better. If the cross-sectional area of the filter is increased, the flow rate per unit area can be reduced, so that the flow rate from the suction nozzle can be increased and fine toner can be easily collected by the filter, which is suitable for collecting toner. .
  • filter paper is used for the filter, the filter paper may be broken due to air pressure. Therefore, it is advisable to arrange a wire mesh together with the filter paper. According to this, the filter paper does not break, and it also helps to measure the charge of the toner collected by the filter.
  • the suction nozzle which is the capturing means, is basically made of a conductor, and is preferably composed of an intake port 21, a filter section 18 and an exhaust port 24, and has a shape as shown in FIG.
  • the diameter of the suction port 21 for sucking toner is preferably 2 nun or more and 20 dragons or less. If the diameter is reduced, the load is applied to the pump, and if the diameter is increased, the air flow cannot be made enough to separate the toner.
  • the filter 18 be sandwiched between the intake port 21 and the exhaust port 24.
  • the filter 18 is fixed by screwing down the joint between the intake port 21 and the exhaust port 24 and pressing it down with a screw.
  • packing such as rubber or metal.
  • a filter fixing member 19 such as a ring or a ring, intake air and exhaust air! There is no air leakage and no toner spill.
  • the inside of the intake port 21 is preferably conical.
  • the filter 18 should have a large cross-sectional area for good force, and the suction port of the suction nozzle needs to be small. If the diameter of the suction nozzle is changed rapidly from a small one to a large one, the turbulence of air will be generated at the front stage of the filter, the pressure on the filter will change significantly, and the filter may be damaged. . In addition, since the toner is easily collected in one place, the amount of collected toner is reduced. Therefore, a conical shape that gradually expands is good. As a result, a large pressure change is eliminated, and the toner is dispersed over the entire surface of the filter, so that a large amount of toner can be collected.
  • the tip K of the suction port be electrically insulated by the insulating member 23. This is because if the suction nozzle is a semiconductor or a conductor, the charge accumulated in the developer container escapes when the suction nozzle comes into contact with a toner carrier or the like holding the toner.
  • the material of the tip is preferably glass or the like because it is difficult to be charged by friction with metal.
  • rubber that is difficult to be charged such as polyurethane rubber or silicon rubber, may be used. If an elastic material such as rubber is used, the mesh will be in contact with the software, so it will not damage the mesh and will be in contact with the mesh in a direction perpendicular to the mesh.
  • the insulating part from the nozzle tip K to the intake port side 22 of the intake port 21 is at least 2 mm. This is because insulation can be ensured even when deformed by 1 ⁇ . If the insulating part from the tip of the nozzle to the conductor container is too long, a part where the charge amount cannot be measured is not good. The toner attached to the insulating part generates an induced charge in the nearby conductor, but if the insulating part is wide, the charge cannot be induced. Therefore, the distance from the developer container such as a photoreceptor or a developing roll to the conductor container should be small enough to be smaller than the nozzle diameter.
  • the diameter of the exhaust port is connected to the suction means, it is easier to connect if the diameter is smaller than the diameter of the suction port of the suction means, and if it is larger than the diameter of the suction port, the air flow rate can be increased. .
  • the suction nozzle is mostly composed of a conductor to measure the charge, but in order to connect it to the charge measuring means, a contact electrode 25 with the suction nozzle is provided at the suction port of the suction means.
  • a contact electrode 25 with the suction nozzle is provided at the suction port of the suction means.
  • the shape of the contact electrode 25 can be adjusted to the shape of the exhaust port of the suction nozzle to obtain electrical contact by sliding, and also to the electrical contact by an elastic member 26 using a leaf spring and a coil panel. There is a method. In FIG. 5, electrical contact is ensured by using both contact electrodes and elastic members.
  • the electric wire 28 from the contact electrode 2 ⁇ to the electric charge measuring means is tightly connected to the contact electrode at the connection terminal 27, and an electric shielded cable such as a coaxial cable is used for the electric wire as much as possible. Good to use.
  • the hose part 32 from the suction port 15 of the suction means and the electrically shielded electric wire 28 should be integrated into a single unit so that the operability is better and the connector can be attached to and detached from the suction means and the electric charge measuring means. If provided, portability can be improved. If the suction nozzle is made electrically conductive as described above, electric leakage will occur if the suction nozzle is held by hand. Insulated members around the suction nozzle Leakage must be prevented using 29. An easy way to prevent leakage is to use an insulating container 30 that squeezes and stores the suction nozzle. However, when the insulating container 30 is charged, the amount of electric charge is difficult to understand: There is also a method of improving insulation by using air insulation.
  • the best method is to reduce the amount of insulating material that comes into contact with the internal suction nozzle, provide electrical insulation with air, and ground the insulated container 30 held by hand with a metal or other electrically conductive material. Shielding can be performed, and leakage can be prevented.
  • a lid 31 must be attached to the electromagnetically shielded insulating container 30 so that the suction nozzle can be attached and detached.
  • the suction nozzle is electrically insulated from the suction nozzle and may be made of an insulating material. However, it is better to use a conductor as the outer wall of the lid and provide electromagnetic shielding.
  • the charge amount measuring means 36 may use an electrification meter as described above. In order to measure the charge amount generated by suction of a force, the following means is used. First, by connecting a capacitive load 6 such as a capacitor and a voltmeter or potentiometer 38 in parallel, and measuring the potential difference, the amount of charge can be measured by calculation with the internal load. In addition, by providing the short-circuit switch 69, excessive charge is not stored in the capacitive load 6, and the calculation of the potential difference can be easily performed. By short-circuiting before toner suction and measuring after toner suction, the displayed value can be directly used as the charge amount.
  • a capacitive load 6 such as a capacitor and a voltmeter or potentiometer 38 in parallel
  • the short-circuit switch 69 excessive charge is not stored in the capacitive load 6, and the calculation of the potential difference can be easily performed.
  • a capacitor of about 0.1 F is suitable for capacitive hatching, if the charge is 1 ⁇ C Zg and the output voltage is about 10 V.
  • the output voltage is about 1 to 10 V.
  • the weight of the suction nozzle, including the filter 18, is It is better to be as light as possible with 100 g or less. It is easy to use the existing electronic balance as the weight measuring means 40. However, care must be taken during measurement because incorrect measurements may be made unless grounding is performed once. It is advisable to prepare a grounded table. In addition, since a sample with a resolution of 0.1 mg can measure only up to 100 g of force, the above-mentioned suction nozzle cannot be measured unless it is 100 g or less. If you want to perform more measurements, use a balance with a weight.
  • a vacuum cleaner is used as the suction means 33, it is very easy to handle. After the toner is separated from the developer, the toner is sucked through a suction nozzle by a pressure generated by a fan rotated by a motor 35 or a reciprocating piston. After suction, it may adhere to pipes, motors, fans, pistons, etc., and weaken the suction power. Therefore, it is very convenient to use a vacuum cleaner with a filter 34 inside for the purpose of collecting dust.
  • vacuum cleaners tend to be large in size, making them inconvenient to carry. Therefore, if a small suction pump is used after the toner is collected by the filter 18 of the suction nozzle and the toner is collected, it is good because it is small and light and portable. By the way, the suction pressure of the used pump was measured by attaching a pressure gauge to the suction port. As a result, it was confirmed that a small pump of about 0.5 to 0.8 kg f Zcni 2 was sufficient.
  • suction means and charge amount measurement means in one box as shown in Fig. 7-Suction nozzle 17 which is a capture means sucks toner and measures charge amount
  • the electric wire for measuring the charge amount is placed along the hose of the vacuum cleaner, which is the suction means, and the suction means and the electric charge amount measurement means are integrated, so that the hose and the electric wire can be easily handled.
  • the toner can be sucked while checking the charge amount with one switch of the box.
  • the operability is improved by putting the electric wire in the hose or placing the switch near the suction nozzle, like a vacuum cleaner using a hose with a hand switch for the hose and electric wire. .
  • the weight measuring means and the charge amount measuring means may be integrated. After the developer holding means is held at one place, the toner is sucked and the charge amount is measured. Therefore, focusing on the measuring dish 41 placed on the measuring table 42 of the weight measuring means, and providing the supporting means 43 for supporting the measuring dish 41 up and down, the weight and the charge amount can be measured. When the supporting means is lowered, the developer holding means and the measuring dish 41 are placed on the measuring table 42 so that the weight can be measured. When the measuring dish is lifted and supported, the measuring dish can hold the developer holding means, and the charge amount can be measured by connecting the supporting means 43 to the charge amount measuring means. Therefore, the weight and the amount of electric charge before and after suctioning the toner can be measured while moving the support means up and down. As a result, since the developer is not moved by holding the developer holding means, the measured value is not erroneously obtained by spilling the developer.
  • the method for measuring the optimal charge amount of the present invention is described below with reference to FIG. 1 using a two-component developer as an example.
  • a plurality of filters 18 without clogging are put into the suction nozzle 17 serving as a capturing means after being stacked, and fixed.
  • the weight A of the developer measuring means and the weight B of the suction nozzle are measured by the weight measuring means 40.
  • the protective cover 14 is put on, and then grounded by the earth switch 39 of the charge measuring means 36: provided at the suction port of the suction means. Put the suction nozzle into the insulated container and close the lid. Then, it is grounded by the earth switch 39 of the charge amount measuring means on the suction nozzle side.
  • the switch of the suction means is inserted and suction is started.
  • the tip of the suction nozzle is moved to a desired position of the developer holding means, and the toner is sucked while being visually observed.
  • the switch of the suction means is turned off.
  • the charge E on the developer holding means and the charge F on the suction nozzle are read from the electrometer of the charge measuring means.
  • the developer holding means and the suction nozzle are taken out, and the weight C of the developer measuring means and the weight D of the suction nozzle are measured by the weight measuring means.
  • the charge amount is obtained from the charge difference and the weight difference
  • N is the weight of the developer measured initially.
  • the charge amount can be measured twice, and an accurate charge amount can be obtained.
  • the measurement device of the present invention can easily exchange filters and meshes, and can easily and accurately measure since the portion for measuring the charge amount and the weight is a single point.
  • the weight and charge of the toner can be measured by the suction nozzle that collects the toner, and the measurement can be performed by the developer holding means that separates the toner. It can be measured accurately.
  • the device can be made compact and portable. Industrial applicability
  • the measuring device for measuring the charge amount of a dry developing material used in an electrophotographic apparatus, a copying machine, or the like can be used alone. It is also possible to measure the amount of charge in real time by incorporating it into a computer and use it for control during development.

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Abstract

L'invention porte sur un appareil permettant de mesurer une charge statique accumulée sur une buse d'aspiration, pourvue d'un filtre, destinée à recueillir de l'encre en poudre par aspiration. On pèse la buse d'aspiration et l'importance de la charge statique est déterminée grâce aux différences existant en charge et en poids avant et après l'aspiration de l'encre en poudre. Après avoir fermé un récipient révélateur au moyen d'une grille, l'encre en poudre est aspirée et retirée. Dans la mesure où il se crée alors des différences de charge et de poids dans le récipient, l'importance de la charge peut être déterminée de la même manière. Puisque l'utilisation d'un gros appareil, bien qu'utilisé par les techniques antérieures, n'est plus indispensable, il est possible de mesurer une charge au moyen de mécanismes d'aspiration compacts. La charge statique d'encre en poudre à la surface d'un élément photosensible, ou analogue, peut être également mesurée. De plus comme il est possible d'effectuer des mesures de plusieurs façons, on obtient des valeurs de mesure précises.
PCT/JP1996/000758 1996-03-22 1996-03-22 Appareil de mesure d'une charge statique dans une encre en poudre et procede correspondant WO1997036174A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1996/000758 WO1997036174A1 (fr) 1996-03-22 1996-03-22 Appareil de mesure d'une charge statique dans une encre en poudre et procede correspondant
JP53421797A JP3567463B2 (ja) 1996-03-22 1996-03-22 トナー帯電量測定装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/000758 WO1997036174A1 (fr) 1996-03-22 1996-03-22 Appareil de mesure d'une charge statique dans une encre en poudre et procede correspondant

Publications (1)

Publication Number Publication Date
WO1997036174A1 true WO1997036174A1 (fr) 1997-10-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/000758 WO1997036174A1 (fr) 1996-03-22 1996-03-22 Appareil de mesure d'une charge statique dans une encre en poudre et procede correspondant

Country Status (2)

Country Link
JP (1) JP3567463B2 (fr)
WO (1) WO1997036174A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009157483A1 (fr) * 2008-06-26 2009-12-30 ユーテック株式会社 Cage de faraday et dispositif la comportant
JP2010210383A (ja) * 2009-03-10 2010-09-24 U-Tec Corp 粉体電荷量測定器
JP2011185771A (ja) * 2010-03-09 2011-09-22 U-Tec Corp 粉体電荷量測定装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5197183B2 (ja) * 2008-06-26 2013-05-15 ユーテック株式会社 粉体電荷量測定器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5844361A (ja) * 1981-09-11 1983-03-15 Toshiba Corp 粉体の帯電量測定装置
JPH01250074A (ja) * 1987-12-16 1989-10-05 Ricoh Co Ltd 粉体の帯電量測定装置
JPH04328592A (ja) * 1991-04-30 1992-11-17 Mita Ind Co Ltd トナーの電荷量測定装置
JPH07261553A (ja) * 1994-03-17 1995-10-13 Hitachi Ltd トナーの電荷量測定装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5844361A (ja) * 1981-09-11 1983-03-15 Toshiba Corp 粉体の帯電量測定装置
JPH01250074A (ja) * 1987-12-16 1989-10-05 Ricoh Co Ltd 粉体の帯電量測定装置
JPH04328592A (ja) * 1991-04-30 1992-11-17 Mita Ind Co Ltd トナーの電荷量測定装置
JPH07261553A (ja) * 1994-03-17 1995-10-13 Hitachi Ltd トナーの電荷量測定装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009157483A1 (fr) * 2008-06-26 2009-12-30 ユーテック株式会社 Cage de faraday et dispositif la comportant
US8525045B2 (en) 2008-06-26 2013-09-03 U-Tec Corporation Faraday cage and device having same
JP2010210383A (ja) * 2009-03-10 2010-09-24 U-Tec Corp 粉体電荷量測定器
JP2011185771A (ja) * 2010-03-09 2011-09-22 U-Tec Corp 粉体電荷量測定装置

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