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全文: "天田勝正"
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  • 半円弧ばねの寸法誤差にもとづく変位誤差比の修正方法
    吉村 靖夫, 楠田 昌之, 赤坂 隆
    精密工学会誌
    1992年 58 巻 6 号 1029-1034
    発行日: 1992/06/05
    公開日: 2009/10/08
    ジャーナル フリー
    So far, authors have clarified the effects of dimensional errors of the parallel spring move-ment with right half circular springs on the error rate of displacement. Although it is desirable for balances that the dimensional errors of springs are eliminated by machining, such a work itself, however, takes engineers much time to correct the dimensional errors. So, the authors propose here a notched springs by which the error rate of displacement can be modified without eliminating the dimensional errors. Following is concluded through theoretical, experimental and FEM analyses. (1) In case of the movement with two circular springs, a notch at around±16deg measured from the position with theminimum thickness is most effective formodification, while the one at the minimum thickness contributes to no modification. (2) In case of that with four circular springs, a notch at around ±3deg measured to the outsides, respectively, from the position with the minimum thickness is most effective for modification, while the one near reinforcing plate shows a few effect.
  • 真直板ばねの寸法誤差にもとつく変位誤差比の修正方法
    吉村 靖夫, 楠田 昌之, 天田 勝正, 赤坂 隆
    精密工学会誌
    1991年 57 巻 4 号 658-663
    発行日: 1991/04/05
    公開日: 2009/10/08
    ジャーナル フリー
    In the previous papers, authors have clarified the effects of dimensional errors of the parallel movement for balance on the error rate of displacement. Although the correction of the dimensional errors of the springs in length and thickness is necessary for accurate measurement, it is, however, difficult to eliminate the dimensional errors by machining. The authors propose to put a groove on the springs, which modifies the error rate of displacement without eliminating the dimensional errors. Following is concluded through theoretical, experimental and FEM analyses. (1) The groove at the ends of the spring is most effective for modification, while the one at the center of the spring does not contribute to the modification. (2) The modification effect is in proportion to the width and thickness of the groove. (3) In case of the parallel spring movement with four leaf springs, the reinforcing plate reduces the modification effect due to the groove.
  • 最小板厚に寸法誤差のある4個の円弧ばねの場合
    吉村 靖夫, 天田 勝正, 赤坂 隆
    精密工学会誌
    1989年 55 巻 8 号 1391-1396
    発行日: 1989/08/05
    公開日: 2009/10/08
    ジャーナル フリー
    There is an ideal point with constant translational displacement in the parallel spring movement comprised of the springs which are symmetric with respect to an axis passing through its midpoint. Compared with the leaf springs, the circular springs can be, from the view point of machinability, made easily with high accuracy, because only boring is needed. Authors studied the effect of the dimensional error of the minimum thickness of the springs on the error rate of displacement of the moment. The paper may be summarized as follows ; (1) Around fifty percent of the dimensional error of the minimum thickness contributes to the error rate of the displacement. This leads directly to the error of mass to be measured by the movement as balance, (2) There exists no difference in the effects of the dimensional errors on the error rate of displacement, between two springs of the upper or lower side, (3) Owing to the mutual compensation, the dimensional errors of the upper and lower springs brought by boring a circular hole through a blank cause no the error rate of displacement, and (4) the existence of the reinforcing plate attributes to improve the sensitivity of the movement as balance and reduce the error rate of displacement.
  • 寸法誤差のある4個の真直板ばねの場合
    吉村 靖夫, 天田 勝正, 赤坂 隆
    精密工学会誌
    1989年 55 巻 4 号 748-753
    発行日: 1989/04/05
    公開日: 2009/10/08
    ジャーナル フリー
    A movement with two leaf springs can be modified to one with four leaf springs by replacing the each of midpoints of upper and lower springs, respectively, with reinforcing plate. Even so, the ideal point whose displacement remains unchanged sticks on the midpoint of the reinforcing plate, regardless of the loading position. The above is undisturbed by dimensional errors as far as the symmetry of the movement is kept. The dimensional errors, however, bring the constant error rate of displacement at the ideal point, resulting in the error of mass to be measured by a balance using the movement. Authors discussed in this paper the influences of the dimensional errors in length and thickness of the four leaf springs on the error rate of displacement. Followings are clarified theoretically, experimentally and by FEM ; (1) Around 3/4 and 3/8 of the rate of dimensional error in thickness and length, respectively, contribute to the error rate of displacement. (2) The error rates of displacement are proportional to the difference between the dimensional errors in thickness of two springs, and are proportional to the difference between those in length of outside (or inside) of the two springs.
  • 天田 勝正, 吉村 靖夫
    図学研究
    1987年 21 巻 Supplement 号 VII1-VII5
    発行日: 1987年
    公開日: 2010/08/25
    ジャーナル フリー
  • 寸法誤差がある真直板ばねの場合
    吉村 靖夫, 天田 勝正, 赤坂 隆
    精密工学会誌
    1988年 54 巻 7 号 1328-1333
    発行日: 1988/07/05
    公開日: 2009/10/08
    ジャーナル フリー
    Based on the experiments, the beam theory and FEM, followings are clarified in this report. (1) The ideal point of the movement with error of dimension does not deviate from the middle point of two springs as long as two springs are symmetric regarding to y-axis passing through the middle point. Strict analysis, however, gives a small amount of deviation. (2) The error rate of displacement at the ideal point can be written as (3/2)(Δl/l0t/t0), using two error rates of dimension in length and thickness, Δl/l0 and Δt/t0. This means that the error of dimension causes the error rate of displacement, or error of mass to be measured by using the movement as balance, independent of loading and measuring position s and x. There exists no error rate of displacement if the movement is adjusted so that Δl/l0 is equal to Δt/t0.
  • ひずみ特性の解析とその改善
    松田 孝, 佐藤 元宥, 佐藤 浩一郎, 北川 徹
    精密工学会誌
    1990年 56 巻 2 号 393-398
    発行日: 1990/02/05
    公開日: 2009/06/30
    ジャーナル フリー
    The strain characteristics in a solid double beam type load cell for scales with a stabilized pan, are analyzed and discussed by finite element analysis and experiments. And it is clarified that the nonlinearity and the error due to loading position is mainly due to the buckling of the beam. On those analysis, it is proposed how to reduce them, and it is ascertained by finite element analysis and experiments that the reduction method is effective.
  • 吉村 靖夫, 天田 勝正, 赤坂 隆
    日本機械学会論文集 C編
    1988年 54 巻 503 号 1452-1457
    発行日: 1988/07/25
    公開日: 2008/02/21
    ジャーナル フリー
    One piece parallel spring movement has an unique point, a load applied on which makes its carrier move rectilinearly without rotational displacement, or pitch. It is significant to study the effect of errors in dimension of leaf springs, that is, length and thickness, on pitch error which dominates the capability of a movement designed to move with translational motion. Theoretical analysis followed by Finite Element Method (FEM) help the authors make sure the most important thing in this paper as following; As long as both two leaf springs are symmetric in their shape, with respect to a given line, no pitch error is observed, resulting in the carrier being moved with rectilinear motion. The line mentioned above is the one which passes through the midpoints of two springs in the longitudinal direction.
  • 楠田 昌之, 吉村 靖夫
    日本時計学会誌
    1990年 135 巻 11-22
    発行日: 1990/12/15
    公開日: 2017/11/09
    ジャーナル フリー
    With rapid development of computer facilities, the peripheral equipments, printer, disc drive, display and so on are unavoidable to be used under severe circumstances such as temperature changes, electrical noises, and mechanical shocks. In particular cases where airplanes and automobiles are equipped with these equipments, influence of mechanical vibration and noise on the performances are inevitable. One of typical output equipments supposed to be used in severe environments is a printer. The vibrations are thought to consist mainly of external vibrations and internal ones caused by driving the motor and gears. By these vibrations, disordered figures or letters and shaded color are apt to be printed out in their circumstances. This paper aims to obtain a clue for optimum design of its anti-vibration structure by analyzing the vibration characteristics of printer head mechanism, with modal analyses, finite element method (FEM), and motion excitation tests. Basesd on the results obtained, some measures are proposed to keep high quality of printing.
  • 堀江 三喜男
    精密工学会誌
    1997年 63 巻 3 号 337-340
    発行日: 1997/03/05
    公開日: 2009/06/30
    ジャーナル フリー
  • -寸法誤差のある円弧ばねの場合-
    吉村 靖夫, 天田 勝正, 赤坂 隆
    精密工学会誌
    1988年 54 巻 10 号 1915-1920
    発行日: 1988年
    公開日: 2009/10/08
    ジャーナル フリー
    In the parallel spring movement, there is a unique point where regardless of loading position, rectilinear displacement remains unchanged. The point shows no deviation from the origin as long as each of two parallel springs are symmetrical regarding y axis passing through the origin. Error of thickness of the spring, however, causes appreciable error rate of displacement, resulting in the error of a mass to be measured by a balance. As for workableness, the circular spring is better than leaf spring, because high dimensional accuracy can be obtained by such a conventional tool as end milling cutter. Authors aim in the paper to clarify the effect of the error of the minimum thickness of the circular springs on the error rate of displacement by comparison of theoretical analysis with the experiments and Finite Element Method (FEM). The results may be briefed as followings : (1) The error rate of the minimum thickness of the circular spring, Δtm/tm0 contributes approximately to the error rate of displacement, independent of the position of loading and sensors. (2) The error rate of displacement is influenced by not only the loading and measuring position but also the ratio of the minimum thickness to the radius, or tm/R0.
  • 同一寸法の板ばねの場合
    吉村 靖夫, 天田 勝正, 赤坂 隆
    精密工学会誌
    1987年 53 巻 11 号 1746-1751
    発行日: 1987/11/05
    公開日: 2010/02/16
    ジャーナル フリー
    There is a singular point in the movement, whose rectilinear displacement remains constant independent of the loading position of a mass. The point is located at the geometrical center of two springs. It is, however, clarified in this paper that strictly analyzing displacement of springs by using the theory of beam subject to combined loads, the point deviates from the center. The results reported are; (1) The deviation of the point is expressed as, xp/l0=-(3/175)(δy0/t0)2 (s/l0), where l0, t0; half length and thickness of leaf spring, s; loading position of the mass, measured from the center, and δy0; displacement of the point at s=0, equivalent to the true value of the mass. (2) Letting δy, be displacement of an arbitrary point x, the ratio, (δyy0)/δy0 means the error rate of the mass to be weighed. The ratio is written as, (δyy0)/δy0_??_(t0/L0)2(s/l0)(x/l0), where L0; height between two springs. Since t0/L0 is, in general, very small, as small values of s/l0 and x/l0 as possible contribute to the design of a balance with high accuracy.
  • 阿部 幸勇, 近野 敦, 内山 勝
    ロボティクス・メカトロニクス講演会講演概要集
    2010年 2010 巻 1A2-D22
    発行日: 2010年
    公開日: 2017/06/19
    会議録・要旨集 フリー
    An H-slit type beam (double beam type load cell) has an effect on increasing the strain signals. It can help to enlarge the sensitivity of a force sensor while keeping enough rigidity and stiffness. The other characteristic of an H-slit beam is that its deformation pattern is same as that of a four bar link mechanism. For this kind of mechanism, it is highly important to show resistivity to torsional deformation forces. Commercial weighting equipments utilizing this type of load cell is expected to be capable of eliminating the error due to off-center loading. The effectiveness of it is believed to be the similarity between its structure and a Roberval balance mechanism. However, the moment canceling mechanism involved in it has not been made clear. This paper investigates the error eliminating ability of an H-slit beam and a single beam structure when exerted by an off-center load through FEA model.
  • 吉村 靖夫, 天田 勝正, 赤坂 隆
    日本機械学会論文集 C編
    1989年 55 巻 515 号 1741-1746
    発行日: 1989/07/25
    公開日: 2008/02/21
    ジャーナル フリー
    No pitch exists in the movement, when a load is applied on the ideal point of a parallel spring movement. Dimensional inaccuracies, however, brings the reduction of capability of fine adjustment. Using the results in the previous report concerning the movement with leaf springs, the authors show the influence of dimensional errors of two and four circular springs on the pitch. Some points clarified in this paper are as follows, (1) Two Spring Movement: The error of the minimum thickness causes no pitch as long as the circular spring is symmetrical. The horizontal deviation of the center of the upper spring from that of the lower causes the pitch proportional to the amount of the deviation. (2) Four Spring Movement: If the two springs of the upper side have the same dimensional errors symmetrical about a vertical line passing through the midpoint of the lower side, no pitch appears in the movement
  • プロトタイプモデルによる基礎的研究
    磯部 浩己, 久曽神 煌, 小島 茂
    精密工学会誌
    1999年 65 巻 3 号 438-442
    発行日: 1999/03/05
    公開日: 2009/04/10
    ジャーナル フリー
    Hydrostatic air bearings allow a floating shaft to rotate accurately with compressed air. They are utilized in many fields because of their load carrying capacity, although the shaft does not rotate. However, the installation of additional equipment such as air compressor, regulator and pipelines etc. is required to supply pressured air into the bearing. In this research, piezoelectric actuators oscillate a number of pads surrounding the shaft. In consequence, squeeze air films with load carrying capability are developed. A piezo displacement pattern consists of two functional waveforms. The AC component stimulates the squeeze motion and the other DC component shifts the mean position of oscillating pad. Therefore, application of a controllable piezo-driving pattern allows the shaft to be manipulated. In this paper, the air film characteristics are investigated experimentally for a prototype model with two circular plates of 15mm in radius as oscillating pads. The squeeze air film was able to support the object against the external load of 4.9N with a mean film thickness of 5.5μm. It had the capability to support an external load up to 9.8N with a stiffness of 1.8N/μm. By constructing a simple feedback system, the object was manipulated accurately without contact.
  • 図学研究
    1987年 21 巻 2 号 41-54
    発行日: 1987年
    公開日: 2010/08/25
    ジャーナル フリー
  • 図学研究
    1984年 18 巻 1 号 51-63
    発行日: 1984年
    公開日: 2010/08/25
    ジャーナル フリー
  • 阿部 幸勇, 内山 勝
    精密工学会誌
    2010年 76 巻 10 号 1200-1205
    発行日: 2010/10/05
    公開日: 2011/04/05
    ジャーナル フリー
    The H-slit beam structure is an effective structure used in design of force sensor. It can enlarge sensitivity while it keeps enough rigidity and stiffness. One of the characteristics of the H-slit beam structure is that its deformation pattern is same as that of a four bar link mechanism. In this kind of mechanism, it is highly important to show recovery from deformation force under specific distance between the parallel beams. Like a Roberval balance mechanism, the H-slit beam structure is also capable of moment canceling though the mechanism involved in it has not been explicitly developed. This paper investigates the efficiency of the H-slit beam structure by comparing the generated strains of it with that of the Roberval mechanism. Here the strain is calculated by using FEA (Finite Element Analysis) and experimental models. All of the results show that the H-slit beam structure is effective in canceling the moment due to the distance between strain signal sensing position and loading position. The results also demonstrate that when the distance between two parallel beams in the structure is too narrow, the structure will become ineffective for moment canceling.
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