1376566 PT1287 27946twf.d〇c/n 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種減逮機構，且特別是有關於一插 可捲收式屏幕的減速機構。 ^ 【先前技術】 投影裝置通常會配合一投影屏幕作為其影像投射標 的。投影屏幕的常見類型是可捲收式屏幕，因其具有可^ 收性，因而增添了投影裝置於使用上的便利性。就可捲收 式屏幕而言，為了使屏幕自捲收器下拉後，需回收屏幕時， 避免因捲收器彈箐的回復力量過大，導致屏幕瞬間衝擊捲 枚态外殼而造成損傷。因此，捲收器上通常會設置一減速 機構，以減緩屏幕回復至捲收器外殼内的速度。 ^習知之一種設置於可捲收式屏幕的減速機構採用了 複雜的結構。此種減速機構包括離合結構、傳動結構以及 制動結構，其中傳動結構是以行星齒輪組所構成。當動力 從行星齒輪組傳遞至制動結構時，制動結構會高速旋轉來 產生離心摩擦，以達到減速的目的。因此，屏幕便可以緩 慢地捲收至捲收器内。然而，此種減速機構的結構複雜， 且傳動時需S贿㈣境’並紐常杨麟油以進行潤 滑，維護與使用均不方便。 【發明内容】 本發明提出一種適用於可捲收式屏幕的減速機構，可 PT1287 27946twf.doc/n 精簡其製作工藝以及降低製作成本。 本發明之/實施例提出一種減速機構，適用於一可播 收式屏幕。減速機構包括一外殼、一芯軸、至少—摩終葉 片以及一往復滑塊。外殼具有一軸承孔及一導弓丨螺紋二^ 軸具有一樞轉段、一安裝段及一滑動段，其中樞轉段穿設 至軸承孔内，而安裝段位於外殼内。摩擦葉片可樞轉地嗖 置於安裴段。往復滑塊可滑動地設置在滑動段，並具: ，引突起。其中當外殼相對於芯軸沿一第一時針方^ t 2突起沿著導引螺紋繞行，使得往復滑塊朝向摩捧 =外殼相對於_沿著-相反於第—時針方向的^斜 Γ突起沿著導引螺紋繞行使得往復_』 擦2葉片4動，用以減少摩擦葉片與外殼的内面間的摩 輪承i本實施例中，上述減速機構之外殼包括一 引段鎖附至及—封·。軸承段具有軸承孔。導 段附至軸承段，並具有料螺紋。封閉段鎖附至導引 施rr上述之外殼相對於芯轴繞著 旋轉軸線=轉頻帽目物駿沿著第一 上平實施财，上述之摩擦軸沿著一實質 者，摩擦葉片的-端可樞轉地設置至安 1376566 PT1287 27946twf.d〇c/n 用接觸外殼的内面β ^本發明之-實關中，上述之往復滑塊具有一錐 =往復_朝向縣葉片相對於滑動段軸向地滑動 m姆於滑動段徑向地施力至雜料。另一方面， / 有至少—缓衝H端固設於往復滑塊的— 並延伸至錐面與摩擦葉片之間，用以緩衝摩擦 加在往復滑塊上相對於_的徑向分力。往復滑塊 摊:田限位槽而滑動段具有一限位銷，其延伸至限位 槽内’用以定義往復滑塊相對於滑動段的—滑動範圍。 妯骑月之實細例中，上述之減速機構更包括一彈 用道料彈簧其配設於往復滑塊與外殼之間， 用以驅使導引突起朝向導引螺紋移動。 f發明之上述實施例因採用摩擦 可將習知採用行星齒輪的減速機構予以精簡化，^本^ 組才能達到的減速效果，以多個摩擦葉 m 完成’因而得以使製造流程簡單化以及 成本。另一方面，相較於行星齒輪組拆知及 之上述實施例所採用的摩擦葉片因結構 fc早且易加1 ’提供了可捲收式屏幕於轉上不少的便利 性。因=本發明之上述實施例於製造及 習知減速機構的缺點。 白j 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉-貫施例’並配合所關式，作詳細說明如下。 8 1*376566 PT1287 27946twf.doc/n 【實施方式】 下列各實施例的說明是參考附加的圖式，用以例示本 ，月可用以實施之特定實施例。本發明所提到的方向用 語’例如「上「a r r 1 工」 下」 刖」、「後」、「左」、厂右」 等，僅是參考附加圖式的方向。因此，使用的方向用語是 用來說明，而非用來限制本發明。 圖1A是本發明一實施例之一種減速機構的示意圖。 圖1B是圖ία之減速機構的爆炸圖。請參考圖1A及圖 1B，本實施例揭露一種適用於可捲收式屏幕的減速機構 100 ’其包括一外殼110、一芯軸12〇、至少一摩擦葉片13〇 以及一往復滑塊140。至少一摩擦葉片的數量可為多個， 視其所需之摩擦力大小而決定，於本實施例中，至少一摩 擦葉片130的數量為三個，但不以此為限。 外殼110包括一轴承段112、一導引段114及一封閉 段116，其中軸承段112具有一軸承孔iua，導引段114 鎖附至轴承段112，並具有一導引螺紋n4a，而封閉段116 鎖附至導引段114。芯軸120具有一樞轉段122、一安裝段 124及一滑動段126，其中樞轉段122穿設至軸承孔U2a 内’安裝段124位於外殼110内，而摩擦葉片130則可樞 轉地設置至安裝段124，且往復滑塊140可滑動地設置在 滑動段126上，並具有一導引突起142。 圖2A是圖1B之減速機構於捲收屏幕時的剖面示意 圖，圖2B是圖2A之減速機構的部分示意圖，圖2c是圖 2B之減速機構的側視圖。為求能清楚了解減速機構1〇〇 PT1287 27946twf.doc/, =二=葉片13°、往復滑塊-與轴承段112 件。請同時來考^ M ^此圖2β及圖2C只顯示部分零 行捲收時，外殼110^ 兀，當可捲收式屏幕進 S，且沿著―第—時^於芯轴120、繞著一第一旋轉轴線 备^針方向F旋轉，此時導引突起W2便 Γΐ°ΐ2η^ Μ繞行，以使往復滑塊⑽相對於轴承 信Γ著旋轉轴線8且朝向摩擦葉片130滑動。 —壯en/寻/思的疋，摩擦葉片130的一端可檀轉地設置於 Γ '又U4’而當往復滑塊140朝向摩擦葉片130滑動時： =於往復4⑽前翻—錐面c會提供相對於滑動段 26的一徑向力&施加於摩擦葉片13〇上因此摩擦葉片 130+會沿著—實質上平行但不重合於第—旋_線§的第 二旋轉軸線τ旋轉，使其另一端與外殼11()的内面接觸並 產生摩擦。摩擦力的增加可降低外殼11〇相對於芯軸12〇 的轉速’進而減緩可捲收式屏幕的捲收速度。 在本實施例中，往復滑塊140更包括至少一緩衝片 144 ’其一端固設於往復滑塊140的一端，緩衝片H4並延. 伸至錐面C與摩擦葉片130之間’其可用具有彈性之鋼材 或其他耐磨耗的材質製成，用以缓衝摩擦葉片130施加在 往復滑塊140上相對於芯軸120的徑向分力Fr，使往復滑 塊140避免與摩擦葉片13〇直接接觸導致承受徑向分力Fr 而受損。 請再參考圖1B，在本實施例中’往復滑塊140還具 有一限位槽146，而滑動段126的相對應位置上則具有一 1376566 PT1287 27946twf.doc/n 限位銷126a’其延伸至限位槽146内。因此，藉由限位槽 146與限位銷126a的配合，可將往復滑塊14〇以一鎖附件 126b限^於㈣段126纟，使往復滑塊⑽被限定僅能沿 第一旋轉轴線S進行移動而不能轉動。再者，可藉由限位 槽146與第一旋轉轴線s平行方向的長度，限定往復滑塊 140相對於滑動段126的滑動範圍，以控制往復滑塊14〇 的行程，可間接控制摩擦葉片130與外殼11〇的内面的摩 擦力範圍。 圖3A是圖1B之減速機構於下拉屏幕時的剖面示意 圖，圖3B是圖3A之減速機構的部分示意圖，圖3c是圖 3B之減速機構的側視圖。為求能清楚了解減速機構 於下拉屏幕時，摩擦葉片13〇、往復滑塊14〇與軸承段112 内面互相作動的情形，因此圖3B及圖3C只顯示部分零 件。請同時參考圖3A、圖3B與圖3C，當屏幕下拉時， 外忒110相對於芯軸120繞著第一旋轉軸線s ,但沿著與 第一時針方向F相反的一第二時針方向R旋轉，使得導引 犬起142沿著導引螺紋U4a反向繞行，‘以使往復滑塊 140相對於軸承孔112a沿著第一旋轉軸線s且遠離摩擦葉 片130滑動’以致退出導引螺紋u4a。因此，摩擦葉片I% 卸除與外殼110的内面的接觸，摩擦力減少，屏幕得以平 順地下拉。 當屏幕下拉一段距離後，減速機構100的導引突起142 完全退出導引螺紋114a。此時’為避免屏幕再次捲收時， 導引突起142與導引螺紋U4a發生錯位而導致減速機構 1376566 PT1287 27946twf.doc/n 100失效。因此，在本實施例中，減速機構10〇還包括一 彈性體150 ’例如為一螺旋彈簧，其配設於往復滑塊14〇 與封閉段116之間’其中彈性體15〇的一端嵌設於往復滑 塊140 ’而另一端則嵌設於封閉段116。當往復滑塊140 退出導引螺紋114a時，彈性體150提供與退出方向相反的 彈性力，藉以驅使導引突起142朝向導引螺紋114a移動並 對位。 φ 綜上所述，本發明之上述實施例的減速機構以往復滑 塊推動摩擦制的方式代替了冑知技術巾以複雜的行星齒 ^進订減速的方式’因而精簡了原本複雜且難度較高的 •造過程，其中摩擦葉片及其他相關零件因構造簡單而易 3加=，故而在製造組裝或使用維修上，其困難度相較於 採用行星齒輪組的減速機構降低許多。 另一方面，具有行星齒輪組的減速機構具有固定的齒 =比，無法針對屏幕捲㈣的雜力進行罐。然而，本 _ = 上述f施_減速機構由於採取摩擦葉片直接接觸 對庫纲’故而可依據屏幕捲收時所需要的緩衝力量， 應調整摩擦葉片或往復滑塊的相關位置及行程。 構，it獨於制行星絲_減速機於濕式結 • 作，過程中需要以潤滑劑進行潤滑以避免行星齒輪 構=㈣之上述實⑽的減速機制是屬於乾式結 行拆二摩地進 於更換行星齒輪組的較高維修費用，本;明之上:實= 12 1376566 PT1287 27946twf.doc/n 的減速機構更具有市場上的競爭力。 =本發明已以—實施例揭露如上然其並非用以限 疋本發b ’任何所屬技術領域中具有通常知識者在不脫 離本發明之精神和範_，當可作些許之更動與潤飾，因 :本=保護範圍當視後附之申請專利範圍所界定者為 準。另外本㈣的任-實施例㈣請專職财須達成本 發明所揭露之铸目的紐點㈣點。此外摘要部分和 標題僅是^辅助翻文件搜尋之用，並_來限制本發 明之權利範圍。 【圖式簡單說明】 圖1A是本發明-實施例之—種減速機構的示意圖 圖1B是圖1A之減速機構的爆炸圖。 圖2A是圖1B之減速機構於捲收屏幕時的剖面示意1376566 PT1287 27946twf.d〇c/n IX. Description of the Invention: [Technical Field] The present invention relates to a reduction mechanism, and more particularly to a reduction mechanism for a retractable screen. ^ [Prior Art] A projection device usually cooperates with a projection screen as its image projection target. A common type of projection screen is a retractable screen, which is retractable, thereby increasing the convenience of use of the projection device. In the case of a retractable screen, in order to make the screen retract from the retractor, it is necessary to reclaim the screen, so as to avoid excessive recovery force due to the retractor of the retractor, causing the screen to instantly impact the wound casing and cause damage. Therefore, a speed reduction mechanism is usually provided on the retractor to slow the return of the screen to the speed inside the retractor housing. ^ A known speed reduction mechanism disposed on a retractable screen employs a complicated structure. The speed reduction mechanism includes a clutch structure, a transmission structure, and a brake structure, wherein the transmission structure is formed by a planetary gear set. When power is transmitted from the planetary gear set to the brake structure, the brake structure rotates at high speed to generate centrifugal friction for deceleration. Therefore, the screen can be slowly retracted into the retractor. However, the structure of such a speed reduction mechanism is complicated, and it is necessary to use a bribe (four) environment and a new Changyang oil for lubrication, which is inconvenient to maintain and use. SUMMARY OF THE INVENTION The present invention provides a speed reduction mechanism suitable for a retractable screen, which can be PT1287 27946twf.doc/n to streamline its manufacturing process and reduce manufacturing costs. The present invention/embodiment proposes a speed reduction mechanism suitable for a playable screen. The speed reduction mechanism includes a casing, a mandrel, at least a final blade and a reciprocating slider. The housing has a bearing bore and a guide arch thread. The shaft has a pivoting section, a mounting section and a sliding section, wherein the pivoting section is threaded into the bearing bore and the mounting section is located within the housing. The friction blades are pivotally placed in the ampoule section. The reciprocating slider is slidably disposed on the sliding section and has: a projection. Wherein the outer casing is circumscribed along the guiding thread along a first hour hand with respect to the mandrel such that the reciprocating slider faces the armor = the casing is opposite to the _ along - opposite to the first - hour direction The protrusion is wound along the guiding thread so that the reciprocating blade 2 moves to reduce the friction wheel between the friction blade and the inner surface of the outer casing. In the embodiment, the outer casing of the speed reducing mechanism includes a lead segment to be attached to And - seal. The bearing segment has a bearing bore. The guide is attached to the bearing segment and has a thread. The closed section is locked to the guiding rr. The outer casing is rotated relative to the mandrel about the axis of rotation. The rotating cap is carried out along the first upper level. The friction axis is along a substantial one, and the friction blade is - The end is pivotally arranged to the 1376566 PT1287 27946twf.d〇c/n with the inner surface of the contact housing β ^ In the present invention, the reciprocating slider has a cone = reciprocating _ towards the county blade relative to the sliding segment axis Slide the m to the radial direction to apply the force to the miscellaneous material. On the other hand, / there is at least - the buffer H end is fixed to the reciprocating slider - and extends between the tapered surface and the friction vane to buffer the radial component of the friction on the reciprocating slider relative to _. The reciprocating slider spreads the field limiting slot and the sliding section has a limit pin extending into the limiting slot to define the sliding range of the reciprocating slider relative to the sliding section. In the case of the riding cycle, the above-mentioned speed reducing mechanism further includes a ball spring which is disposed between the reciprocating slider and the outer casing for driving the guiding protrusion to move toward the guiding thread. The above-described embodiment of the invention can simplify the conventional speed reduction mechanism using planetary gears by using friction, and the deceleration effect that can be achieved by the group can be completed with a plurality of friction blades m, thereby simplifying the manufacturing process and cost. . On the other hand, the friction vane used in the above embodiment as compared with the planetary gear set and the structure fc is early and easy to add 1 ' provides a convenient retractable screen for turning. Because of the above-described embodiments of the present invention, the disadvantages of manufacturing and conventional speed reduction mechanisms are met. The above features and advantages of the present invention will become more apparent and understood from the following detailed description. 8 1*376566 PT1287 27946twf.doc/n [Embodiment] The following description of the embodiments is provided with reference to the accompanying drawings. The directional term "referred to in the "a r r 1 work", "刖", "back", "left", factory right", etc., is only referring to the direction of the additional drawing. Therefore, the directional terminology used is for the purpose of illustration and not limitation. 1A is a schematic view of a speed reduction mechanism according to an embodiment of the present invention. Fig. 1B is an exploded view of the speed reduction mechanism of Fig. Referring to FIG. 1A and FIG. 1B, the present embodiment discloses a speed reduction mechanism 100' suitable for a retractable screen, which includes a housing 110, a mandrel 12A, at least one friction blade 13A, and a reciprocating slider 140. The number of the at least one friction blade may be determined by the number of the frictional force. In this embodiment, the number of the at least one friction blade 130 is three, but not limited thereto. The housing 110 includes a bearing section 112, a guiding section 114 and a closing section 116, wherein the bearing section 112 has a bearing hole iiu, the guiding section 114 is locked to the bearing section 112, and has a guiding thread n4a, and is closed. Segment 116 is attached to guide segment 114. The mandrel 120 has a pivoting section 122, a mounting section 124 and a sliding section 126, wherein the pivoting section 122 is bored into the bearing hole U2a. The mounting section 124 is located in the outer casing 110, and the friction blade 130 is pivotally The mounting section 124 is provided, and the reciprocating slider 140 is slidably disposed on the sliding section 126 and has a guiding protrusion 142. Fig. 2A is a schematic cross-sectional view of the speed reduction mechanism of Fig. 1B when the screen is taken up, Fig. 2B is a partial schematic view of the speed reduction mechanism of Fig. 2A, and Fig. 2c is a side view of the speed reduction mechanism of Fig. 2B. In order to clearly understand the speed reduction mechanism 1 〇〇 PT1287 27946twf.doc /, = two = blade 13 °, reciprocating slider - and bearing segment 112 pieces. Please also test ^ M ^ This figure 2β and Figure 2C only show part of the zero line reel, the shell 110 ^ 兀, when the retractable screen enters S, and along the "first" ^ on the mandrel 120, around A first axis of rotation is rotated in the direction of the needle F. At this time, the guiding protrusion W2 is circumscribed so that the reciprocating slider (10) is adjacent to the bearing with respect to the axis of rotation 8 and facing the friction blade 130. slide. - 壮 en / seek / think 疋, one end of the friction blade 130 can be set to Γ 'also U4' and when the reciprocating slider 140 slides toward the friction blade 130: = reciprocating 4 (10) forward - cone c will Providing a radial force & relative to the sliding segment 26 applied to the friction blade 13A such that the friction blade 130+ will rotate along a second axis of rotation τ that is substantially parallel but does not coincide with the first rotation line §, The other end is brought into contact with the inner surface of the outer casing 11 () and friction is generated. The increase in friction reduces the rotational speed of the outer casing 11 〇 relative to the mandrel 12 进而 and thereby slows the retraction speed of the retractable screen. In this embodiment, the reciprocating slider 140 further includes at least one buffer sheet 144' having one end fixed to one end of the reciprocating slider 140, and the buffer sheet H4 extending to extend between the tapered surface C and the friction blade 130. The elastic steel or other wear-resistant material is used to buffer the radial component force Fr of the friction blade 130 applied to the reciprocating slider 140 relative to the mandrel 120, so that the reciprocating slider 140 avoids the friction blade 13 〇 Direct contact causes damage due to the radial component force Fr. Referring to FIG. 1B again, in the embodiment, the reciprocating slider 140 further has a limiting slot 146, and the corresponding position of the sliding section 126 has a 1376566 PT1287 27946twf.doc/n limit pin 126a' extending. To the limit slot 146. Therefore, by the cooperation of the limiting groove 146 and the limiting pin 126a, the reciprocating slider 14 can be restricted to the (four) segment 126 by a locking attachment 126b, so that the reciprocating slider (10) is limited to only along the first rotating axis. Line S moves and cannot rotate. Moreover, the sliding range of the reciprocating slider 140 relative to the sliding section 126 can be defined by the length of the limiting slot 146 in the direction parallel to the first rotation axis s to control the stroke of the reciprocating slider 14〇, and the friction can be indirectly controlled. The range of friction between the blade 130 and the inner face of the outer casing 11〇. Fig. 3A is a schematic cross-sectional view of the speed reduction mechanism of Fig. 1B when the screen is pulled down, Fig. 3B is a partial schematic view of the speed reduction mechanism of Fig. 3A, and Fig. 3c is a side view of the speed reduction mechanism of Fig. 3B. In order to clearly understand the deceleration mechanism, when the screen is pulled down, the friction vane 13〇, the reciprocating slider 14〇 and the inner surface of the bearing segment 112 actuate each other, so that only parts of FIG. 3B and FIG. 3C are shown. Referring to FIG. 3A, FIG. 3B and FIG. 3C simultaneously, when the screen is pulled down, the outer cymbal 110 is around the first axis of rotation s with respect to the mandrel 120, but in a second hour direction R opposite to the first hour hand direction F. Rotating so that the guide dog 142 is reversely circulated along the guiding thread U4a, 'so that the reciprocating slider 140 slides along the first axis of rotation s and away from the friction blade 130 with respect to the bearing hole 112a' so as to exit the guiding thread U4a. Therefore, the friction blade I% is removed from the contact with the inner surface of the outer casing 110, the frictional force is reduced, and the screen is smoothly pulled down. When the screen is pulled down a distance, the guiding protrusion 142 of the speed reducing mechanism 100 completely exits the guiding thread 114a. At this time, in order to prevent the screen from being retracted again, the guiding protrusion 142 is misaligned with the guiding thread U4a, causing the speed reducing mechanism 1376566 PT1287 27946twf.doc/n 100 to fail. Therefore, in the present embodiment, the speed reducing mechanism 10A further includes an elastic body 150' such as a coil spring disposed between the reciprocating slider 14〇 and the closing section 116, wherein one end of the elastic body 15〇 is embedded. The reciprocating slider 140' and the other end are embedded in the closing section 116. When the reciprocating slider 140 is withdrawn from the guide thread 114a, the elastic body 150 provides an elastic force opposite to the withdrawal direction, thereby driving the guide projection 142 to move and align toward the guide thread 114a. φ In summary, the speed reduction mechanism of the above-mentioned embodiment of the present invention replaces the method of the known planetary tooth to reduce the speed of the friction by the reciprocating slider pushing the friction system, thereby simplifying the complexity and difficulty. The high manufacturing process, in which the friction blades and other related parts are simple and easy to add, so the difficulty in manufacturing assembly or maintenance is much lower than that of the planetary gear set. On the other hand, the speed reduction mechanism having the planetary gear set has a fixed tooth ratio, and it is impossible to carry out the tank for the miscellaneous force of the screen roll (four). However, this _ = the above-mentioned f-speed reduction mechanism can adjust the relevant position and stroke of the friction blade or the reciprocating slider according to the buffering force required for the screen to be taken up by the direct contact of the friction blade. Structure, it is independent of the planetary wire _ reducer in the wet knot • The process needs to be lubricated with lubricant to avoid the planetary gear structure = (4) The above-mentioned real (10) deceleration mechanism is a dry-type detachment In order to replace the higher maintenance costs of the planetary gear set, this above: the real = 12 1376566 PT1287 27946twf.doc / n speed reduction mechanism is more competitive in the market. The present invention has been disclosed in the above-described embodiments, and it is not intended to limit the scope of the present invention to those skilled in the art without departing from the spirit and scope of the present invention. : This = the scope of protection is subject to the definition of the scope of the patent application attached. In addition, the four-part (four) point of the casting of the present invention is required for the full-term financial position of the present invention. In addition, the abstract sections and headings are only used to assist in the search of documents and to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic view of a speed reduction mechanism of the present invention - Fig. 1B is an exploded view of the speed reduction mechanism of Fig. 1A. 2A is a schematic cross-sectional view of the speed reduction mechanism of FIG. 1B when the screen is retracted;
圖2B是圖2A之減速機構的部分示意圖。 圖2C是圖2B之減速機構的側視圖。 圖3A是圖1B 圖。 之減速機構於下拉縣時的剖面示意 圖3B是圖3A之減速機構的部分示意圖 圖3C是圖3B之減速機構的側視圖。 【主要元件符號說明】 100 :減速機構 13 1376566 PT1287 27946twf.doc/n 110 :外殼 112 :軸承段 112a :轴承孔 114 :導引段 • 114a:導引螺紋 116:封閉段 120 :芯軸 122 :樞轉段 • 124 :安裝段 126 :滑動段 126a :限位銷 126b :鎖附件 130 :摩擦葉片 140 :往復滑塊 142 :導引突起 144 :緩衝片 • 146 :限位槽 150 :彈性體 C :錐面Figure 2B is a partial schematic view of the reduction mechanism of Figure 2A. 2C is a side view of the speed reduction mechanism of FIG. 2B. Fig. 3A is a view of Fig. 1B. FIG. 3B is a partial schematic view of the speed reduction mechanism of FIG. 3A. FIG. 3C is a side view of the speed reduction mechanism of FIG. 3B. [Main component symbol description] 100: Reduction mechanism 13 1376566 PT1287 27946twf.doc/n 110: Housing 112: Bearing segment 112a: Bearing hole 114: Guide segment • 114a: Guide thread 116: Closed segment 120: Mandrel 122: Pivot section • 124: Mounting section 126: Sliding section 126a: Limiting pin 126b: Locking attachment 130: Friction blade 140: Reciprocating slider 142: Guide protrusion 144: Buffer sheet • 146: Limiting groove 150: Elastomer C :tapered surface
Fr :徑向力 F:第一時針方向 R :第二時針方向 S:第一旋轉轴線 T:第二旋轉軸線Fr : radial force F: first hour hand direction R: second hour hand direction S: first axis of rotation T: second axis of rotation