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
  • G04B19/00—Indicating the time by visual means
  • G04B19/06—Dials
  • G04B19/08—Geometrical arrangement of the graduations
  • G04B19/082—Geometrical arrangement of the graduations varying from the normal closed scale
• • 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
  • G04B19/00—Indicating the time by visual means
  • G04B19/02—Back-gearing arrangements between gear train and hands

Definitions

• the invention relates to a mechanism for moving an indicator of a clock according to the preamble of the independent claim.
• the invention relates to a mechanism for driving a clock hand, which is moved from one extreme position to another extreme position and then reset in the same way, without making a complete turn.
• the pointer stands in each case in certain positions of a scale to indicate a date or a time.
• CH-A3-666 591 discloses in a general form such a mechanism consisting essentially of a cam connected to a star-shaped pinion. Both are arranged around an axis and rotate about this axis.
• the star-shaped pinion which has seven prongs and rotates gradually, is held in this position at any position by a lever which engages in the indentations of the prongs.
• seven different positions of the cam are established, and one finger of a rake, which is frictionally connected to the cam, slides along the contour of the cam and adapts to the contour.
• the contour of the cam is designed so that there are seven different positions, which have a slightly different level than the rest of the contour, so that the finger finds support.
• the rake thus shifts piecemeal and the teeth of the rake, which engage the teeth of a pinion of the pointer, move the pointer, which shifts in a corresponding manner in each case by a corresponding angle.
• the pointer is with a pen connected, which resets the pointer and generates a force acting on the pointer and the rake.
• CH-A-666.591 has little advantage in respect of one of the contours of the cam plate in that the distances between the discrete positions are relatively large, so that the changeover moments take a relatively long time, which can have a negative effect, in particular on the return of the pointer.
• US-A-5,043,955 also discloses such a mechanism wherein four rakes are arranged around a single central cam.
• the four rakes each drive a pointer, which are arranged at the four corners of a square clock.
• the rakes are pressed onto the contour of the cam with a spring.
• the spring has two legs and is attached to a point.
• EP-A1-1 102 134 discloses a timepiece with such a mechanism, wherein two rakes are arranged around a central cam.
• the peculiarity here is that the rake consist of two legs, one leg is positively connected to the contour of the cam and the second leg has teeth that adjust the pointer. Both legs converge at a common point and are pivotally mounted about this point.
• US-A-2,292,458 discloses a similar mechanism which additionally provides for a linear displacement of two pointers.
• a second rake is provided to compensate for the play between the teeth of a first rake and the teeth of the pinion.
• the rake is provided on the other side of the pinion and exerts a force on the pinion, which is opposite to the force of the first pinion.
• it is less advantageous in this arrangement that it occupies a lot of space, since the rakes are arranged on two different sides of the pinion. Due to the size of the cam, moreover, hardly any geometric changes are possible in order to transfer the system to another application.
• the embodiment has the advantage that it saves space and the rake each other by the overlapping arrangement stabilize. This can be supported by an additional fixation, which has a certain play.
• an additional fixation which has a certain play.
• a game and vibrations when changing the position of the indicator can be avoided. This is thus at a fixed position, even if the clock is moved by the user.
• the rakes can also be pivotally mounted about the one common axis, which has the advantage that an additional axis and associated fasteners omitted.
• the pitch of the teeth and also the modulus of the two rakes may be different in both rakes, so that the designer advantageously has an extra degree of freedom in designing a particular embodiment.
• the second rake can exert force on the pinion, it is positively connected to a spring, which acts on a recess of the second rake, which is arranged on a side opposite the cam.
• the spring may have two legs and be mounted on a fixed point.
• the cam which is connected to a pinion, has a contour, so that the first rake remains in a plurality of discrete positions upon rotation of the cam.
• the cam is a worm and consists of two offset ellipsoid or semicircle-like elements, wherein between the elements a jump in the contour of the cam is present.
• rakes and also the pinion which drives the indicator may be made of a plastic. Further advantageous embodiments are specified in the subclaims. Brief description of the figures
• Fig. 1 is a view of a mechanism for setting a clock hand in a reset position
• Fig. 2 is a view of a mechanism for setting a clock hand in a maximum position.
• FIG. 1 shows a mechanism 1 according to the invention for moving an indicator of a clock, which moves from one extreme position to another extreme position and is then reset in the same way without making a full 360 ° turn.
• the indicator which is not shown in the figure 1, is connected to the pinion 7 and stands in each case in certain positions of a scale to indicate a day of the week, a date, a time, seconds, etc.
• Figure 1 shows the mechanism at a maximum position immediately after the resetting of the indicator.
• the indicator may be a clock hand, such as a retrograde clock hand, or a dial partially visible through a window of the clock.
• the mechanism consists of a cam 2, which is connected to a star 3, which drives it.
• the cam is a worm.
• the cam 2 has a contour 21 and consists in the embodiment shown of two staggered, ellipsoidal or semi-circular elements, wherein between the two elements a jump 22 in the contour 21 of the cam 2 is present.
• the star 3 and the cam 2 rotate about a common axis A.
• the star 3 is driven by an actuator 32, which has a nose, and held in any particular position by a lever spring 31.
• a first rake 4 is positively connected to the cam plate 2.
• the rake 4 which is mounted pivotably about an axis B, has teeth 41 on one side.
• the rake 4 On the side facing the cam 2, the rake 4 has an L-shaped recess 42 which forms a finger 43 at a portion.
• the finger 43 which is also partially equipped with the teeth 41, frictionally rests on the contour 21 of the cam 2.
• the contour 21 of the cam 2 has a plurality of slight dents or points of slightly lower level, so that the first rake 4 stops at a rotation of the cam 2 in a plurality of discrete positions. In the embodiment shown, seven segments and positions are provided per element, each of which represents a day of the week. Overall, thus arise on the cam 2 fourteen elements.
• the number of dents or positions and the specific embodiment of the cam 2 the contour 21 and the jumps 22 may vary according to the given example and the value to be displayed.
• a pinion 7 is connected to a not shown in the figure 1 indicator.
• the pinion 7 thus drives the clock hand or the disc.
• the pinion 7 has a number of teeth 71 which engage in the teeth 41 of the first rake 4.
• the pinion 7 rotates about an axis C.
• the teeth 41 of the rake 4 rest on one side on the teeth 71 of the pinion 7 and thus transmit a force.
• a second rake 5 is arranged overlapping the first rake 4.
• the embodiment has the advantage that it is space-saving and the rakes stabilize each other by the overlapping arrangement.
• the rake 5 has teeth 51, which also engage in the teeth 71 of the pinion 7.
• the second rake 5 is pivotally mounted together with the rake 4 about the first axis B and both elements 4, 5 are connected by a fixing 44, 54 with each other, which holds the two rakes 4, 5 together.
• the rake 5 additionally has a guide 53.
• the second rake 5 exerts a force on the teeth 71 of the pinion 7, which is opposite to the force exerted by the first rake 4 on the pinion 7.
• This force alone would thus rotate the pinion 7 in a clockwise direction.
• the teeth 51 abut on the side of the teeth 71 at which the mentioned clearance between the second side of the teeth 41 and the teeth 71 of the pinion 7 is present.
• a spring 6 is positively connected to it.
• the spring 6 is arranged in a parallel plane to the rake and on the side of the rake 5, which is opposite to the cam plate 2. On this side, the rake 5 has a recess 52, can act on the spring 6.
• the spring 6 has two legs 61 and is mounted on a fixed point 62, on which both legs 61 converge. A leg 61 is held by a fastening 63.
• Other springs or power transmission elements are also conceivable within the scope of the invention.
• the pitch of the teeth 41, 51 and also the modulus of the two rakes 4, 5 may be different in both rakes 4, 5, so that the designer advantageously has an additional degree of freedom in the design of a specific embodiment of the inventive mechanism.
• one or both rakes 4, 5 and also the pinion 7 may be made of a plastic. This applies in particular to the rake 5, which can be manufactured as a standard part and thus can work together in different movements with first, for example metallic, rakes 4 of different size, pitch and / or modules.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Geometry (AREA)
• Electromechanical Clocks (AREA)
• Transmission Devices (AREA)
• Measurement Of Unknown Time Intervals (AREA)
• Gears, Cams (AREA)
• Measurement Of Predetermined Time Intervals (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

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Family Applications (1)

Country Status (8)

Families Citing this family (4)

Family Cites Families (17)

• 2006
  • 2006-03-30 CH CH00509/06A patent/CH703800B1/de unknown
• 2007
  • 2007-03-19 WO PCT/EP2007/052563 patent/WO2007113098A2/fr active Application Filing
  • 2007-03-19 JP JP2009502015A patent/JP5164969B2/ja not_active Expired - Fee Related
  • 2007-03-19 AT AT07727041T patent/ATE478363T1/de active
  • 2007-03-19 EP EP07727041A patent/EP1999518B1/fr not_active Not-in-force
  • 2007-03-19 CN CN2007800119409A patent/CN101416126B/zh not_active Expired - Fee Related
• 2008
  • 2008-08-27 US US12/199,251 patent/US7817501B2/en not_active Expired - Fee Related
• 2009
  • 2009-06-19 HK HK09105536.1A patent/HK1128050A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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