EP2801868A2 - Hemmungsrad - Google Patents

Hemmungsrad Download PDF

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Publication number
EP2801868A2
EP2801868A2 EP14156753.7A EP14156753A EP2801868A2 EP 2801868 A2 EP2801868 A2 EP 2801868A2 EP 14156753 A EP14156753 A EP 14156753A EP 2801868 A2 EP2801868 A2 EP 2801868A2
Authority
EP
European Patent Office
Prior art keywords
abutment
anchor
escape wheel
protrusion
adjacent
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP14156753.7A
Other languages
English (en)
French (fr)
Other versions
EP2801868A3 (de
EP2801868B1 (de
Inventor
Stéphane von Gunten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manufacture et Fabrique de Montres et Chronometres Ulysse Nardin Le Locle SA
Original Assignee
Manufacture et Fabrique de Montres et Chronometres Ulysse Nardin Le Locle SA
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 Manufacture et Fabrique de Montres et Chronometres Ulysse Nardin Le Locle SA filed Critical Manufacture et Fabrique de Montres et Chronometres Ulysse Nardin Le Locle SA
Publication of EP2801868A2 publication Critical patent/EP2801868A2/de
Publication of EP2801868A3 publication Critical patent/EP2801868A3/de
Application granted granted Critical
Publication of EP2801868B1 publication Critical patent/EP2801868B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00—Escapements
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/027—Wheels; Pinions; Spindles; Pivots planar toothing: shape and design
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears

Definitions

  • the present invention relates to the field of watchmaking. It relates, more particularly, an escape wheel.
  • the flexible blades of such flexible arms exhaust wheels store a certain amount of energy during the rest phases of the exhaust, due to the flexion of the flexible blades, a portion of this energy being restored to the anchor during the impulse phases of the exhaust.
  • the escape wheel may be subjected to a variable mechanical torque depending on the state of winding of the mainspring.
  • the pulses supplied to the anchor can vary considerably, on the one hand as a function of the impulses due to the rotation of the hub, on the other hand as a function of the pulses due to the energy stored in the flexible blades during the rest phases. Therefore and similarly to a standard escapement (without flexible arm), the amplitude of the pendulum can vary considerably, which affects the isochronism of the watch movement.
  • the object of the invention is thus to propose an escape wheel capable of at least partially reducing the variation of the pulses supplied to the anchor when said wheel is integrated in a clockwork movement.
  • the invention relates to an escape wheel for a clockwork movement, comprising a hub intended to be mounted to rotate with an axis, the axis being intended to be subjected to a mechanical torque induced by a motor spring with which it is associated (via a conventional finishing gear), a plurality of elastic members extending from the hub, a plurality of stop members extending from the hub, each interposed between two adjacent elastic members, and wherein each resilient member is provided with an end portion.
  • said end portion comprises at least a first and a second protuberance, the first protrusion forming a tooth of the escape wheel intended to interact with the escapement anchor to which it is associated, the second protuberance forming a first abutment protrusion extending towards and capable of cooperating with a first adjacent abutment member.
  • the amount of energy that can be stored in each elastic member during the rest phases can be limited depending on the flexure of the elastic member before the first stop protrusion contacts the first adjacent abutment member. . Once such contact is complete, the flexure of the elastic member being thus limited, the amount of energy stored is also limited.
  • the anchor pulse due to the energy stored in the elastic element therefore remains substantially constant for the torque values applied to the hub of the escape wheel, which are sufficient to put the first abutment protrusion and the first adjacent abutment member in contact during the rest phases of the anchor.
  • the end portion may include a third protuberance forming a second abutment protrusion extending to a second adjacent abutment member.
  • This third protuberance and the second adjacent abutment member may be arranged to substantially prevent rotation of the end portion relative to the point of contact between the second protuberance and the first adjacent abutment member when the second protuberance and the first adjacent abutment member. are in contact. Therefore, the geometric position of the teeth of the escape wheel is not undesirably changed when the axis of the escape wheel is subjected to a relatively large torque.
  • the elastic element may comprise at least two blades, and the end portion may comprise a fourth protuberance still forming a tooth of the escape wheel intended to interact with the anchor. Therefore, the resilient member can withstand a torque applied around the point of contact between the second protrusion and the adjacent abutment member, thereby avoiding an undesirable change in the geometrical position of the teeth of the escape wheel when its axis is subject to a relatively large torque.
  • the elastic member is arranged so that the first abutment protrusion and the adjacent abutment member are intended to come into contact with each other when the elastic member is subjected to a mechanical torque equal to or greater than a predetermined torque, this predetermined torque being substantially 0.5 ⁇ Nm. Therefore, the first abutment protrusion and the adjacent abutment element already come into contact during the rest phases when the axis of the escape wheel is subjected to a predetermined minimum torque. So, the pulse applied to the anchor due to the energy stored in the elastic element therefore remains substantially constant throughout the movement.
  • the escape wheel is formed in one piece and is preferably made of non-metallic material, preferably based on silicon, silicon dioxide, diamond-based, based on sapphire, ruby-based, or corundum-based.
  • the end portion comprises at least one first protuberance which forms said tooth of the escape wheel, and at least one second protuberance which forms a first abutment protrusion extending towards a first adjacent abutment member, the second protuberance contacting an adjacent abutment member upon applying said tooth of the escape wheel against said rest plane of the escape anchor.
  • said abutment elements are each interposed between two adjacent elastic members.
  • the figure 1 shows an escape wheel 1 according to a first embodiment of the invention.
  • the escape wheel 1 comprises a hub 2 pierced with an opening 2a for an axis (not shown) intended to be subjected to a torque provided by a motor spring of the clockwork movement in which the escape wheel 1 is intended to be integrated, so that it can be rotated in the direction of rotation R.
  • the opening 2a can be formed at the discretion of those skilled in the art, according to known embodiments.
  • a plurality of elastic members 3 extend from the hub 2 towards the outside of the escape wheel 1. In the present example, twenty elastic members 3 have been illustrated, but this number can be chosen according to the needs of the watchmaker.
  • abutment member 5 Between each pair of adjacent resilient members 3 is an abutment member 5, also extending from the hub 2 outwardly of the escape wheel 1. These abutment members 5 are formed to be substantially more rigid than the elastic elements 3. The abutment elements 5 as illustrated here are perforated, but alternatively may be full.
  • Each elastic element 3 is provided at its free end with an end portion 4.
  • Each end portion 4 comprises a plurality of protuberances 6, 7, 8 which protrude from the point of junction between the elastic element 3 and its extremal part 4.
  • the first protrusion 6 defines a tooth of the escape wheel 1, which is intended to interact conventionally with an anchor, and thus has a conventional shape. As illustrated here, the first protrusion 6 is formed to interact with a Swiss anchor, but the first protuberance 6 could be formed for any type of escapement.
  • the second protrusion 7 extends towards the adjacent stop element 5, in this case in the upstream direction, and forms a stop protrusion, limiting the degree of flexion of the elastic element 3 when the latter is subjected to a torque enough by the hub, as will become clearer in the following.
  • each end portion 4 comprises a third protuberance 8, which in this case has no technical operation and could be omitted, as is the case in the embodiment of the figure 6 (see below).
  • the figures 2 and 3 show an alternative embodiment of an escape wheel according to the invention.
  • the figure 2 shows a partial view at an extremal portion 4 and the free ends of a first abutment member 5a adjacent to the end portion 4 in the upstream direction and a second abutment member 5b adjacent to the end portion 4 in the direction of swallows.
  • the abutment members 5a, 5b as illustrated herein are solid, but alternatively may be perforated.
  • the first protrusion 6 is intended to form a tooth of the escape wheel 1.
  • the escape wheel according to the embodiment of the figures 2 and 3 differs from that of figure 1 in that the third protuberance 8 is formed to interact with the second abutment element 5b, in the downstream direction of the end portion 4.
  • the second protuberance 7 has a triangular beak shape, forming a first abutment protrusion, to enter in contact with the upstream stop element 5a at a single point of contact 5a 2 , taking the form of an angular side cut.
  • the third protrusion 8 also has a beak shape, thus also forming a second abutment protrusion, and is intended to come into contact with the part 5b 1 of the downstream abutment element 5b overhanging the third protrusion 8.
  • the figure 3 shows the same escape wheel 1 as at the figure 2 associated with its anchor 9.
  • the anchor 9 is of standard shape, having an entry pallet 10 and an outlet pallet 13. It is pivoted in the usual manner about its axis 11, and therefore should not be described more in detail.
  • the anchor 9 is illustrated as a monoblock anchor, this characteristic is not essential to the operation of the escapement: it works equally well with conventional anchors having ruby vanes.
  • the escape wheel 1 is not subjected to a torque, which is the case when the motor spring of the clockwork movement in which the escape wheel 1 is integrated is not reassembled or when the gear train is blocked. Consequently, the elastic element 3 is not flexed and is in its rest position. In addition, the end portion 4 is neither in contact with the upstream stop element 5a, nor with the downstream stop element 5b.
  • the figure 4 still shows an alternative variant of an embodiment of the present invention, in a view similar to that of the figure 3 .
  • the elastic element 3 is composed of 2 blades 3a, 3b, linked by a single end portion 4.
  • This end portion comprises a first protuberance 6, a second protuberance 7, and a third non-functional protuberance 8 (which can therefore be suppressed), formed and operating in a manner similar to that of the embodiment illustrated by the figure 1 .
  • the extremal portion 4 further comprises a fourth protuberance 12, formed similarly to the first protrusion 6, and also serving as the tooth of the escape wheel 1.
  • These two teeth of the escape wheel, that is to say say the first protrusion 6 and the fourth protrusion 12 are interconnected by a bar 14, which is substantially more rigid than the blades 3a, 3b of the elastic element 3.
  • This bar 14 is illustrated in FIG. figure 4 as curved and full, but can also be straight and / or openworked.
  • the bar 14 and the two blades 3a, 3b of the elastic element 3 have essentially the same purpose as the double contact between the end portion 4 and the upstream stop elements 5a and 5b downstream embodiments of the figures 2 and 3 , that is to say to avoid unwanted rotation of the end portion 4 when the elastic member 3 is subjected to a torque.
  • the bar 14 and the two blades 3a, 3b can withstand a torque applied around the point of contact between the second protrusion 7 and the upstream stop element 5a, so that the abutment position does not differ significantly in function torque applied to the wheel.
  • the figure 5 still shows an alternative of the invention, according to a view similar to that of the figure 3 .
  • This variant differs from that of the figure 3 in that the first protrusion 6 has a sharp shape to form an escape wheel 1 for an English-type exhaust, that is to say with an unshared pulse, either on the pallet only.
  • the figure 6 still shows an additional variant, according to a view similar to that of the figure 1 .
  • This variant differs from that of the figure 1 in that the end portion 4 is relatively smaller, and in that the third protuberance is absent.
  • the second protuberance 7 is reduced to a curved corner protruding from the junction point between the elastic element and the end portion 4, extending towards a contact surface 5a 2 of the upstream stop element 5a, with which the second protrusion is intended to come into contact when the elastic element 3 is in the bent position.
  • the second protuberance can be considered as projecting from an axis formed by the projection of the elastic element towards the outside of the escape wheel.
  • the figure 7 illustrates an escape wheel 1 identical to that of the embodiment of the figure 3 , also with the first protrusion 6 of the extremal portion 4 of the elastic element 3 in the rest position against the rest plane of the pallet 10 of the anchor 9.
  • a torque has been applied to the hub 2 by means of its axis (not shown), this torque being of sufficient value to bend the elastic element 3 until the second protrusion 7 comes into contact with the contact 5a 2 of the upstream stop element 5a, and the third protrusion 8 comes into contact with the overhanging part 5b 1 of the downstream abutment element 5b. It should be noted that this last point does not occur for the embodiments of the escape wheels 1 illustrated by the figures 1 , 4 and 6 .
  • the minimum torque to obtain this contact would be about 0.5 ⁇ Nm for an escapement that operates with between about 0.2 and 2 ⁇ Nm of torque, but is likely to be chosen arbitrarily by the watchmaker according to his needs and according to the construction of the movement.
  • the other elastic elements that are not subject to the torque naturally remain in their rest positions.
  • the figure 8 illustrates the position of the escape wheel 1 and the anchor 9 during a first part of its impulse phase, just after the release of the first protrusion 6 of the rest plane of the entry pallet 10 of the anchor 9.
  • the clearance causes rotation of the anchor 9 about its axis 11 in the clockwise direction (for the entry pallet) under the action of the pendulum (not shown), then starts the impulse phase.
  • the escape wheel 1 considered in its entirety, has a certain moment of inertia.
  • the anchor In the case of a traditional escape wheel, that is to say rigid, at the time of release, the anchor is already moving, while the escape wheel is stopped. Due to its inertia and possibly also at least a part of the inertia of the upstream work train, it catches the input pallet only after about the first third of the impulse plane. The tooth gives an impulse to the anchor as it travels along the other two-thirds of the impulse plane.
  • the exhaust wheels having flexible teeth generally operate in a slightly different manner, the moment of inertia of the individual teeth, including their elastic elements, being substantially less important than the moment of inertia of the escape wheel taken in its entirety. Therefore, immediately after disengagement, the elastic member, which was bent in the rest position by the torque applied by the hub, can accelerate relatively quickly compared to the rest of the escape wheel, and can therefore follow the plane of impulse of the pallet of the anchor to a greater extent than in the case of a rigid escape wheel. As a result, the tooth of the flexible escape wheel comes into contact with the pulse plane at a point closer to the rest plane than is the case for a rigid exhaust wheel as mentioned above.
  • the figure 9 illustrates the situation a few moments after the one illustrated in figure 6 .
  • the escape wheel 1 accelerates, and rotates in the direction of rotation R, and catches the end portion 4 of the elastic member 3.
  • the first protrusion 6 remaining in contact with the pulse plane of the input pallet 10 of the anchor 9, the elastic element 3 is thus bent again, until the second protrusion 7 comes into contact with the upstream stop element 5a and the third protrusion 8 comes into contact with the overhanging part 5b 1 of the abutment member swallows 5b.
  • the pulse supplied to the anchor 9 is given substantially exclusively by rigid transmission between the hub 2 and the first protuberance 6, via the upstream stop element 5a, the second protuberance 7 remaining in contact with the upstream stop element 5a and the third protuberance 8 remaining in contact with the downstream abutment element 5b up to at the end of the impulse phase.
  • the figure 10 illustrates the situation just before the end of the impulse phase on the tooth.
  • the first protrusion 6 is about to leave the pulse plane of the entry pallet 10 of the anchor 9, and it should be noted that the second protrusion 7 always remains in contact with the upstream stop element 5a and the third protuberance 8 remains in contact with the downstream abutment member 5b.
  • the sequence of operation is identical, not only for the first protrusion 6 of the end portion 4, but also for the fourth protrusion 12, which also forms a tooth of the escape wheel 1 functionally identical to the first protrusion 6. It should also be noted that for the embodiments of the escape wheel 1 illustrated in FIGS. figures 1 and 4 , the comments above concerning the third protrusion 8 do not apply, because the third protrusion 3 is not functional, and does not interact with the downstream abutment element 5b.
  • a portion of the elastic element 3 can bear against the upstream stop element 5a, as an alternative to, or in addition to, the second protuberance 7 in all the embodiments.
  • abutment elements can be located between the blades 3a, 3b of the elastic element 3.
  • the figure 11 illustrates qualitatively in graph form the energy transmitted to the balance wheel when using a traditional and rigid exhaust anchor and escape wheel, during the phases of release and momentum .
  • the values of E lying above the horizontal axis represent the energy supplied to the balance wheel by the escape wheel via the anchor 9, and those lying below the horizontal axis represent the energy consumed by the balance during the release to overcome the friction and pulling force.
  • the bars in dark gray represent the energy values for the case where the drive member is heavily armed (relatively high torque applied to the hub), and bars in light gray represent the energy values for the case where the organ motor is weakly armed (relatively low torque applied to the hub).
  • the energy consumed during the release and the energy supplied during the pulse are greater if the drive member is heavily armed than if the drive member is weakly armed.
  • the total energy transferred is greater if the motor unit is heavily armed than if it is weakly armed.
  • the figure 12 illustrates, in a similar way to the figure 11 energy E transmitted to the balance with the use of an escape anchor and an escape wheel according to the invention.
  • the energy consumed during the release remains substantially similar to that of the case of the figure 11 .
  • the energy supplied during the pulse can be divided between the energy supplied by the elastic element 3, and the energy supplied by the hub 2.
  • the energy supplied to the anchor 9 by the elastic member remains substantially constant.
  • the energy supplied to the anchor due to the hub always varies according to the winding of the mainspring, but the total of the energy transferred relative to the winding of the mainspring is substantially more constant than for the traditional illustrated case. in the figure 11 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gears, Cams (AREA)
EP14156753.7A 2013-05-08 2014-02-26 Hemmungsrad Active EP2801868B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00933/13A CH708043B1 (fr) 2013-05-08 2013-05-08 Roue d'échappement.

Publications (3)

Publication Number Publication Date
EP2801868A2 true EP2801868A2 (de) 2014-11-12
EP2801868A3 EP2801868A3 (de) 2015-11-25
EP2801868B1 EP2801868B1 (de) 2017-10-11

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EP14156753.7A Active EP2801868B1 (de) 2013-05-08 2014-02-26 Hemmungsrad

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EP (1) EP2801868B1 (de)
CH (1) CH708043B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017133917A (ja) * 2016-01-27 2017-08-03 セイコーインスツル株式会社 脱進装置、定力装置、ムーブメントおよび機械式時計
CN107870549A (zh) * 2016-09-23 2018-04-03 宝齐莱股份公司 陀飞轮和带陀飞轮的表
EP3396471A3 (de) * 2017-04-28 2018-12-12 Seiko Epson Corporation Mechanische komponente und uhr
EP3492779A1 (de) * 2017-11-29 2019-06-05 Patek Philippe SA Genève Kupplungsrad mit spielnachstellung
EP3910426A1 (de) 2020-05-13 2021-11-17 The Swatch Group Research and Development Ltd Uhrwerk, das eine hemmung mit einem zahnrad und einer arretierung umfasst
US11543775B2 (en) 2017-02-13 2023-01-03 Patek Philippe Sa Geneve Drive member for a timepiece

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018212113A1 (de) 2018-07-20 2020-01-23 Creaditive Ag Hemmungssystem und das Hemmungssystem umfassendes Messgerät

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7708454B2 (en) 2006-06-23 2010-05-04 Omega S.A. Mobile micromechanical element with shock controlled rotation
JP4849998B2 (ja) 2006-08-29 2012-01-11 セイコーインスツル株式会社 機械式時計の脱進機
CH705300A2 (fr) 2011-07-21 2013-01-31 Manuf Et Fabrique De Montres Et Chronometres Ulysse Nardin Le Locle S A Roue d'échappement.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717488A (en) * 1952-01-07 1955-09-13 Gen Horlogere Noiseless anchor-escapement, particularly for clock-works

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7708454B2 (en) 2006-06-23 2010-05-04 Omega S.A. Mobile micromechanical element with shock controlled rotation
JP4849998B2 (ja) 2006-08-29 2012-01-11 セイコーインスツル株式会社 機械式時計の脱進機
CH705300A2 (fr) 2011-07-21 2013-01-31 Manuf Et Fabrique De Montres Et Chronometres Ulysse Nardin Le Locle S A Roue d'échappement.

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017133917A (ja) * 2016-01-27 2017-08-03 セイコーインスツル株式会社 脱進装置、定力装置、ムーブメントおよび機械式時計
CN107870549A (zh) * 2016-09-23 2018-04-03 宝齐莱股份公司 陀飞轮和带陀飞轮的表
US11543775B2 (en) 2017-02-13 2023-01-03 Patek Philippe Sa Geneve Drive member for a timepiece
EP3396471A3 (de) * 2017-04-28 2018-12-12 Seiko Epson Corporation Mechanische komponente und uhr
US10747178B2 (en) 2017-04-28 2020-08-18 Seiko Epson Corporation Mechanical component and timepiece
EP3492779A1 (de) * 2017-11-29 2019-06-05 Patek Philippe SA Genève Kupplungsrad mit spielnachstellung
EP3910425A1 (de) * 2020-05-13 2021-11-17 The Swatch Group Research and Development Ltd Uhrwerk, das eine hemmung mit einem zahnrad und einer arretierung umfasst
JP2021179424A (ja) * 2020-05-13 2021-11-18 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド 歯車がありストッパーを備えるエスケープを備える計時器用ムーブメント
US20210356911A1 (en) * 2020-05-13 2021-11-18 The Swatch Group Research And Development Ltd Horological movement comprising an escapement provided with a toothed wheel and a stopper
CN113671815A (zh) * 2020-05-13 2021-11-19 斯沃奇集团研究和开发有限公司 包括设有带齿的轮和止动器的擒纵机构的钟表机芯
EP3910426A1 (de) 2020-05-13 2021-11-17 The Swatch Group Research and Development Ltd Uhrwerk, das eine hemmung mit einem zahnrad und einer arretierung umfasst
JP7199464B2 (ja) 2020-05-13 2023-01-05 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド 歯車がありストッパーを備えるエスケープを備える計時器用ムーブメント
US11934150B2 (en) 2020-05-13 2024-03-19 The Swatch Group Research And Development Ltd Horological movement comprising an escapement provided with a toothed wheel and a stopper

Also Published As

Publication number Publication date
EP2801868A3 (de) 2015-11-25
CH708043B1 (fr) 2018-02-15
CH708043A2 (fr) 2014-11-14
EP2801868B1 (de) 2017-10-11

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