1303218 九、發明說明： 【發明所屬之技術領域】 本案係關於一種送紙機構，尤指一種適用於事務機之 送紙機構。 【先前技術】 工 隨著電子技術的大幅進步，現今辦公室中所有的庶務 _作幾乎都與事務機息息相關，例如：影印機及印表 等’因此這些事務機可說是辦公室不可或缺的資訊設備， 通常，一般事務機都會設有供紙機構及送紙機構，等到事 務機收到指令啟動之後，導紙機構再將紙張依序送入事於 機内部之-預定位置’待進行完料、傳真或是掃描等二 構會將已處理完畢之紙張傳送至事務機出紙 7 ’習知的送紙機構主要藉由—齒赌在紙張上， -邊與紙張接觸而另一邊則利用轉動的方 =且為了使送紙機構能夠與紙張接觸齒輪的 性口Η牛’才能將虔力傳遞至紙張上，但是此種 因 =張厚度的差異而導致無法提供料㈣力。至 ’當印表機 不易吸墨的 一但齒輪因, 的 材 習知的送紙機構適用於印表機等事務機時 墨水Ε所喷出的墨滴較大，且紙張本身為較 質或是墨滴喷射至紙張上的固定性較差時， 1303218 - 紙張厚度的因素而傳遞過大的壓力至紙張上時，墨水將會 • 附著在齒輪上，除了會造成原本紙張的列印内容不清楚 - 外，原本附在齒輪表面上的墨水也會轉附著在後續傳送的 紙張上，造成紙張被污染，而影響列印品質，而且當後續 傳送紙張的表面黏附齒輪上的墨水後，將會造成紙張表面 凹凸不平，而這將會再度加重齒輪傳遞到紙張的壓力，進 而影響送紙機構傳送紙張的穩定性。 Φ 因此，如何發展一種可改善上述習知技術之送紙機構 實為目前迫切需要解決之問題。 【發明内容】 本案之主要目的在於提供一種送紙機構，其係藉由彈 性壓持元件來壓迫固定於支承件與夾固板件之間的齒 輪，主要利用彈性壓持元件的彈力使得齒輪能夠因應紙張 的厚度差異而上下移動，可減少對紙張的壓力，且使齒輪 • 與其相對應之旋轉體相接觸，用以傳送紙張，俾解決傳統 送紙機構會因傳送紙張厚度的差異而無法提供穩定的壓 力至每一紙張上，導致紙張上的墨水會附著在齒輪上，並 轉附著在後續傳送的紙張上，造成紙張被污染，而影響列 印品質以及傳送紙張的穩定性不足等缺點。 為達上述目的，本案之一較廣義實施樣態為提供一種 -送紙機構，用以傳送一已進行處理之紙張，其係包含··一 - 支承件，其係具有一第一表面、一第二表面以及至少一個 容置槽；至少一個齒輪由該支承件之該第二表面置入該至@ 7 1303218 . 少一個容置槽中；一夾固板件，其係具有與該至少一個齒 ~ 輪相對應設置之至少一個開孔，且固定於該支承件之第二 - 表面上，用以使該至少一個齒輪固定於該支承件之該至少 一個容置槽中，且該至少一個齒輪之部分結構貫穿該至少 一個開孔；一彈性壓持元件，其係設置於該支承件之該第 一表面上，用以彈性壓迫於該至少一個齒輪上，使該至少 一個齒輪部分結構能貫穿該至少一個開孔因應紙張厚度 _ 差異而移動，與一旋轉體相互傳送該紙張。 根據本案之構想，其中該至少一個齒輪係分別具有一 本體及凸伸之轴桿。 根據本案之構想，其中該支承件之該至少一個容置槽 係分別包含複數個凸部及一槽孔，兩相鄰該凸部之間係用 以容置該齒輪之該本體，該齒輪之該軸桿係部分容置於該 複數個凸部中。 根據本案之構想，其中該彈性壓持元件係包含一板件 ⑩ 及至少一個壓持件’該板件係設置於該鋼性轴之該第一表 面上，該壓持件係用以壓迫該齒輪之該轴桿。 本案之另一較廣義實施樣態為提供一種送紙機構，用 以傳送一已進行處理之紙張，其係包含··一旋轉體；一支 承件，其係具有一第一表面、一第二表面以及至少一個容 置槽；至少一個齒輪，分別具有一本體及至少一個轴桿， - 且與該旋轉體相對應設置，其係由該支承件之該第二表面 - 置入該至少一個容置槽中；一夾固板件，其係具有與該至 少一個齒輪之該本體相對應設置之至少一個開孔，且固定 8 1303218 * 於該支承件之第二表面上，用以使該至少一個齒輪固定於 - 該支承件之該至少一個容置槽中，且該至少一個齒輪之該 - 本體貫穿該至少一個開孔；一彈性壓持元件，其係設置於 該支承件之該第一表面上且具有至少一個壓持件，該壓持 件係壓迫於該至少一個齒輪之該凸伸之軸桿上，使該至少 一個齒輪之該本體與其相對應之該旋轉體相接觸，用以傳 送該紙張。 _ 根據本案之構想，其中該旋轉體係為一滾輪，其係相 對該齒輪壓迫於該紙張之一侧，用以帶動該紙張移動。 根據本案之構想，其中該支承件之該至少一個容置槽 係=別包含複數個凸部及一槽孔，兩相鄰該凸部之間係用曰 以谷置该齒輪之該本體，該齒輪之該軸桿係部分容置於該 複數個凸部中。 根據本案之構想，其中該彈性壓持元件更包含一板 件，其係與該至少-健持件相連接且係設置 • 之該第一表面上。 干 【實施方式】 戈明特徵與優點的—些典型實施例將在後段的 :各=述其在=態樣上具 圖示在本質上㈣作說明之用，而非用以限制本7明及 請參閱第-圖⑷，其係為本案較佳實施例之之送紙 1303218 ΓΓΓίΓ結構示意圖’如圖所示’本案之送紙機構1主 2由支承件η、至少—個齒輪12、央固板件13、彈㈣ 寺元件14以及旋轉體15 (如第_ 其中旋轉Η W炎 弟-圓（a)所不）所組成， 16 ^體15可為—滾輪，其係相對齒輪12磨迫於紙張 之-側用以帶動紙張16移動，且本案之送紙機構！ =用於影印機、印表機或是掃描器等事務機上，主 持元件Μ的彈力使得齒輪12能夠因應紙張的厚 度是異而上下移動，可減少對紙張的壓力，進而使已進行 =或是掃描處理後之紙張傳送至事務機出紙處的堆紙 於本實施例中，齒輪12主要由一本體121以及轴桿122 成’其係與旋轉體15相對應設置（如第二圖（a)及 (:)所示)’其中軸桿122係設置於本體i2i的左右兩側， /輪12的本體121則是用來與紙張16的—侧相抵頂（如 =圖（b)所示）’用以因應設置於紙張π另一側的旋 專體15的帶動而依紙張16的前進方向運動。 。月，閱第圖（a)亚配合第—圖（b)，其中第一圖⑴ 系為第一圖（a)所示之支承件之背面結構示意圖，如圖 =’支承件11主要具有第-表面⑴、第二表Φ 112(如 弟—圖（b)所示）以及複數個由凸部113及槽孔114所 ，成之容置槽115，其中’每一容置槽ιΐ5中的相鄰兩凸 (M13之間所形成之空間係用來容納齒輪之本體⑵， 且齒輪12之㈣122分別容置於凸部ιΐ3以及槽孔ιΐ4 1303218 至於夾固板件13其係具有與齒輪12之本體121相 對應設置之至少一個呈現長條狀之開孔131，當齒輪12由 支承件11之第二表面112方向置入相對應的容置槽115 後’即齒輪12之本體121容納於相鄰兩凸部113所形成 之空間中以及齒輪12之軸桿122分別容置於凸部113以 及槽孔114中，需將夾固板件13固定於支承件u之第二 表面112上，以使齒輪12固定於支承件n之容置槽 中，而齒輪12的本體12將貫穿所對應之夾固板件;3的 開孔131(如第一圖（c)所示），而露出於夾固板件！3外， 使得齒輪12的本體121能夠與紙張16相抵頂（如第二圖 (b )所示）。 ^ $參閱第-圖⑷並配合第二圖（a)， (a)係為第—圖（a)組裝完成之結構示意圖， ^㈣元件14係設置於支承㈣之第-表面⑴斤上不， 件141以及設置於板件⑷兩側邊的至少一個 持件142所組成’板件141係固定於支承件^之 2 而㈣件142則㈣設置於支承件^之容 m 5内#的齒輪12之軸捍122上，使齒於 121與其相對應之旋轉體〗5相接觸，用以因，：二= I6另-側的旋轉體】5的帶動而依紙張16 :前 使得t:之】紙機構1主要利用彈性璧持元件14的彈力 少對紙張的厚度差異而上下移動，可減 張傳运至事務機出紙處的堆紙槽上。 後之、我 11 1303218 =參閱第一圖⑴’本案所揭露之送紙機構！的組 為’首先’先由支承件11的第二表面⑴將齒輪 相鄰兩^置槽出内部’使得齒輪12之本體121容納於 才目4兩凸部113所形成之空 分別衮罟认及回輪12之軸桿122 接著胳：13以及槽孔114中(如第一圖(b)所示)， 接者’將夾固板件13固定於支承件u之第二表面ιΐ2上， 以使齒輪固定於支承件u之容置槽115中而 2 ^本體12將貫穿所對應之夾固板件13的開孔131 (二第1303218 IX. Description of the invention: [Technical field to which the invention pertains] This case relates to a paper feeding mechanism, and more particularly to a paper feeding mechanism suitable for a transaction machine. [Prior Art] With the advancement of electronic technology, all the tasks in the office today are almost always related to the transaction machine, such as: photocopiers and printers, so these machines can be said to be indispensable information for the office. Equipment, usually, the general transaction machine will be provided with a paper feeding mechanism and a paper feeding mechanism. After the transaction machine receives the command to start, the paper guiding mechanism will then sequentially feed the paper into the machine-predetermined position to be completed. , fax or scan, etc., will transfer the processed paper to the paper machine. 7 'The conventional paper feeding mechanism mainly uses the tooth to bet on the paper, the side is in contact with the paper and the other side is rotated. The square = and in order to enable the paper feeding mechanism to contact the paper, the yak of the gear can transmit the force to the paper, but this kind of difference due to the thickness of the sheet can not provide the material (four) force. To the 'when the printer is not easy to absorb ink, but the gear is suitable for the printer, such as the printer, the ink droplets are larger, and the paper itself is better or When the ink droplets are sprayed onto the paper with poor fixability, 1303218 - Paper thickness factor and excessive pressure is applied to the paper, the ink will be attached to the gear, except that the original paper print content is unclear - In addition, the ink originally attached to the surface of the gear will also adhere to the subsequently conveyed paper, causing the paper to be contaminated, which will affect the printing quality, and will cause paper when the surface of the subsequent conveyed paper adheres to the ink on the gear. The surface is uneven, and this will again increase the pressure transmitted by the gear to the paper, which in turn affects the stability of the paper conveyance mechanism. Φ Therefore, how to develop a paper feeding mechanism that can improve the above-mentioned conventional technology is an urgent problem to be solved. SUMMARY OF THE INVENTION The main object of the present invention is to provide a paper feeding mechanism for pressing a gear fixed between a support member and a clamping plate member by an elastic pressing member, mainly by utilizing the elastic force of the elastic pressing member to enable the gear Moving up and down in response to the difference in thickness of the paper, the pressure on the paper can be reduced, and the gears can be brought into contact with the corresponding rotating body to convey the paper, and the conventional paper feeding mechanism cannot be provided due to the difference in the thickness of the conveying paper. Stable pressure on each paper causes the ink on the paper to adhere to the gear and attach to the subsequently conveyed paper, causing the paper to be contaminated, which affects the quality of the print and the stability of the conveyed paper. In order to achieve the above object, a broader aspect of the present invention provides a paper feeding mechanism for conveying a processed paper comprising a first surface and a first surface. a second surface and at least one receiving groove; at least one gear is placed by the second surface of the support member to @7 1303218. one less of the receiving groove; a clamping plate member having the at least one a tooth-wheel corresponding to at least one opening and fixed to the second surface of the support member for fixing the at least one gear in the at least one receiving groove of the support member, and the at least one a portion of the gear is formed through the at least one opening; an elastic pressing member is disposed on the first surface of the support member for elastically pressing the at least one gear to enable the at least one gear portion to be configured The at least one opening is moved in response to the paper thickness_difference, and the paper is conveyed to and from a rotating body. According to the concept of the present invention, the at least one gear train has a body and a protruding shaft, respectively. According to the concept of the present invention, the at least one accommodating groove of the support member respectively includes a plurality of convex portions and a slot, and the two adjacent ones of the convex portions are used for accommodating the gear, the gear The shaft portion is partially received in the plurality of protrusions. According to the concept of the present invention, the elastic pressing member comprises a plate member 10 and at least one pressing member. The plate member is disposed on the first surface of the steel shaft, and the pressing member is for pressing the plate. The shaft of the gear. Another broad aspect of the present invention provides a paper feeding mechanism for conveying a processed paper comprising a rotating body, a support member having a first surface and a second a surface and at least one accommodating groove; at least one gear having a body and at least one shaft, respectively - and corresponding to the rotating body, the second surface of the support member - the at least one capacity a clamping plate member having at least one opening corresponding to the body of the at least one gear, and fixing 8 1303218 * on the second surface of the support member for making the at least a gear is fixed in the at least one receiving groove of the support member, and the body of the at least one gear penetrates the at least one opening; an elastic pressing member is disposed on the first portion of the support member Having at least one pressing member on the surface, the pressing member is pressed against the protruding shaft of the at least one gear, so that the body of the at least one gear contacts the corresponding rotating body for Send the paper. According to the concept of the present invention, the rotating system is a roller that presses the gear against one side of the paper to drive the paper to move. According to the concept of the present invention, the at least one accommodating groove of the support member includes a plurality of convex portions and a slot, and the two adjacent ones of the convex portions are configured to be used for arranging the gears. The shaft portion of the gear is partially received in the plurality of protrusions. According to the concept of the present invention, the elastic holding member further comprises a plate attached to the at least - holding member and disposed on the first surface of the body. [Embodiment] Ge Ming features and advantages - some typical embodiments will be described in the following paragraphs: each = in the = state is illustrated in the essential (four) for illustrative purposes, rather than to limit this Please refer to Fig. 4 (4), which is the preferred embodiment of the present invention, the paper feeding 1303218 ΓΓΓ Γ Γ structure diagram 'as shown in the 'the present paper feeding mechanism 1 main 2 from the support η, at least one gear 12, the central The solid plate member 13, the bomb (four) temple element 14 and the rotating body 15 (such as the first _ which is rotated 炎 炎 炎 - - ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( Forced by the paper - side to drive the paper 16 to move, and the paper feeding mechanism of this case! = used on a copier, printer or scanner, etc., the elastic force of the host member 使得 enables the gear 12 to move up and down according to the thickness of the paper, which can reduce the pressure on the paper, and thus make the = or The paper is transferred to the paper exiting the paper machine in the present embodiment. The gear 12 is mainly composed of a body 121 and a shaft 122, and is disposed corresponding to the rotating body 15 (as shown in the second figure ( a) and (:) shown) 'where the shaft 122 is disposed on the left and right sides of the body i2i, and the body 121 of the wheel 12 is used to abut against the side of the paper 16 (eg, Figure (b) It is shown to move in the advancing direction of the paper 16 in response to the rotation of the rotary body 15 provided on the other side of the paper π. . Month, refer to the figure (a) sub-fitted with the figure - (b), wherein the first figure (1) is the schematic view of the back side of the support member shown in the first figure (a), as shown in the figure = 'the support member 11 mainly has the first a surface (1), a second table Φ 112 (as shown in the figure - (b)), and a plurality of accommodating grooves 115 formed by the protrusions 113 and the slots 114, wherein each of the accommodating grooves ι ΐ Adjacent two protrusions (the space formed between M13 is used to accommodate the body (2) of the gear, and the (four) 122 of the gear 12 is accommodated in the protrusion ι 3 and the slot ι 41303218, respectively, and the clamping plate 13 has the gear 12 At least one of the corresponding bodies 121 is provided with an elongated opening 131. When the gear 12 is inserted into the corresponding receiving groove 115 by the second surface 112 of the supporting member 11, the body 121 of the gear 12 is accommodated in the body 121. The space formed by the adjacent two convex portions 113 and the shaft 122 of the gear 12 are respectively received in the convex portion 113 and the slot 114, and the clamping plate member 13 is fixed on the second surface 112 of the support member u. So that the gear 12 is fixed in the receiving groove of the support n, and the body 12 of the gear 12 will penetrate the corresponding clamping plate; The hole 131 (as shown in the first figure (c)) is exposed outside the clamping plate member 3, so that the body 121 of the gear 12 can abut against the paper 16 (as shown in the second figure (b)). $ Referring to Fig. 4 (4) and in conjunction with Fig. 2(a), (a) is a schematic diagram of the assembly of Fig. (a). ^(4) Element 14 is placed on the first surface of the support (4) (1). The member 141 and the at least one holding member 142 disposed on both sides of the plate member (4) are composed of a 'plate member 141 fixed to the support member 2 and (4) a member 142 (4) disposed in the support member On the axis 122 of 12, the tooth 121 is brought into contact with its corresponding rotating body 〖5, because: 2: I6 other-side rotating body] 5 is driven by the paper 16: before t: The paper mechanism 1 mainly uses the elastic force of the elastic holding member 14 to move up and down with respect to the difference in thickness of the paper, and can be transferred to the stacking slot at the paper exit of the transaction machine. After that, I 11 13 3218 = see the first figure (1) The group of the paper feeding mechanism disclosed in the present case is 'first' firstly the two surfaces of the support member 11 (1) are placed adjacent to the gears to make the gears 1 The body 121 of the second body 121 is accommodated in the space formed by the two protrusions 113 of the head 4, respectively, and the shaft 122 of the acknowledgment and return wheel 12 is respectively slid: 13 and the slot 114 (as shown in the first figure (b)). The connector 'fixes the clamping plate member 13 to the second surface ι 2 of the supporting member u so that the gear is fixed in the receiving groove 115 of the supporting member u and the body 12 will penetrate through the corresponding clamping plate member 13 Opening 131 (two
=所示)，最後將彈性㈣元件14的板件ΐ4ι固定 ;支承件11之第一表面⑴上，而壓持件M 於支承件u之容置槽115内部的會輪12之轴桿12^置 =齒，U之本體121與其相對應之旋轉體15相接觸，即 :完成Ϊ案之送紙機構1 (如第二圖⑷所示）。 凊麥閲第三圖’其係為將本案之送紙機構組裝於印表 機内部之結構示意圖，如圖所示，本案之送紙機構1主要 ^設置於印表機2内部之出紙處附近，且旋轉體15之一 端係與一齒輪組17相連接’用以帶動旋轉體Μ轉動，而 已進行列印或是掃描處理後之紙張16將 :本體_轉體叫細將因應設置= Η另-側的旋轉體15的帶動而依紙張_前進方向穩定 且相對於運動旋轉體15轉動，以使紙張16傳送至印表機 2之出、’驢纟於，本案之送紙機構〗主要利用彈性塵 兀件14的彈力使得齒輪12能夠因應紙張16的厚度差異 而上下移動’因此當傳送的紙張16厚度較料，齒輪以 12 1303218 - 將往上移使得齒輪12與旋轉體15之間的空間增加，可減 - 少對紙張16的壓力，反之當傳送的紙張16厚度較薄時， - 彈性壓持元件14之壓持件142將壓迫齒輪12將往下移使 得齒輪12與旋轉體15之間的空間減少，可使紙張16順 利傳送，即可提供穩定的壓力至每一紙張上，墨水將不會 發生附著在齒輪上，以及附在齒輪表面上的墨水會轉附著 在後續傳送的紙張上的問題，使而將已進行列印或是掃描 φ 處理後之紙張穩定傳送至事務機出紙處的堆紙槽上。 綜上所述，本案之送紙機構係藉由彈性壓持元件來壓 迫固定於支承件與夾固板件之間的齒輪，主要利用彈性壓 持元件的彈力使得齒輪能夠因應紙張的厚度差異而上下 移動，可減少對紙張的壓力，增加列印品質以及提昇傳送 紙張的穩定性。是以，本案之送紙機構極具產業之價值， 爰依法提出申請。 本案得由熟知此技術之人士任施匠思而為諸般修 • 飾，然皆不脫如附申請專利範圍所欲保護者。= shown), finally fixing the plate member ΐ4ι of the elastic (four) member 14; the first surface (1) of the support member 11, and the pressure member M to the shaft 12 of the wheel 12 inside the accommodating groove 115 of the support member u The body 121 of the U is in contact with the corresponding rotating body 15, that is, the paper feeding mechanism 1 (as shown in the second figure (4)) is completed. The third picture of the buckwheat is a schematic diagram of the structure of assembling the paper feeding mechanism of the present case into the inside of the printer. As shown in the figure, the paper feeding mechanism 1 of the present invention is mainly disposed at the paper discharge inside the printer 2. In the vicinity, and one end of the rotating body 15 is connected with a gear set 17 to drive the rotating body to rotate, and the paper 16 after printing or scanning processing will be: the body_turning body will be set according to the setting = Η The other-side rotating body 15 is driven to rotate in the paper_forward direction and rotates relative to the moving rotating body 15 to transfer the paper 16 to the printer 2, which is the main paper feeding mechanism of the present case. With the elastic force of the elastic dust damper 14, the gear 12 can be moved up and down in response to the difference in thickness of the paper 16. Therefore, when the thickness of the conveyed paper 16 is relatively large, the gear is moved upwards 12 1303218 to be between the gear 12 and the rotating body 15. The space is increased to reduce the pressure on the paper 16 and vice versa. When the thickness of the paper 16 to be conveyed is thin, the pressing member 142 of the elastic pressing member 14 will move the pressing gear 12 downward so that the gear 12 and the rotating body Reduced space between 15 can make paper 16 smooth transmission, can provide a stable pressure to each paper, the ink will not adhere to the gear, and the ink attached to the surface of the gear will be attached to the subsequent transfer of paper, so that The paper after printing or scanning φ is stably transferred to the stacker at the exit of the transaction machine. In summary, the paper feeding mechanism of the present invention presses the gear fixed between the support member and the clamping plate member by the elastic pressing member, and mainly utilizes the elastic force of the elastic pressing member to enable the gear to respond to the difference in thickness of the paper. Moving up and down reduces paper pressure, increases print quality, and improves the stability of the transported paper. Therefore, the paper feeding mechanism in this case is of great industrial value and is submitted in accordance with the law. This case has to be modified by people who are familiar with this technology. However, they are all protected by the scope of the patent application.
13 1303218 - 【圖式簡單說明】 第-圖（a):其料本案較佳實施例之職機構之分解 - 結構示意圖。 弟圖（b ) ··其係為第一圖（a )所示之支承件之背面结 構示意圖。 弟一圖（c):其係為第一圖（a)所示之夾固板件固定於 支承件之第二表面上之結構示意圖。 鲁 弟一圖（a):其係為第一圖（a)之組裝完成之結構示意圖。 弟一圖（b):其係為第二圖（a )之A-A’剖面結構示意圖。 第三圖：其係為將本案之送紙機構組裝於印表機内部之結 構示意圖。13 1303218 - [Simple description of the diagram] Figure-a (a): The decomposition of the structure of the preferred embodiment of the present invention - a schematic diagram of the structure. Figure (b) is a schematic view showing the structure of the back side of the support member shown in the first figure (a). Figure 1 (c): This is a structural schematic view of the clamping plate member shown in the first figure (a) fixed on the second surface of the supporting member. Lu Diyi (a): This is a schematic diagram of the assembly of the first diagram (a). Figure 1 (b): This is a schematic diagram of the A-A' cross-sectional structure of the second figure (a). Fig. 3 is a schematic view showing the structure of assembling the paper feeding mechanism of the present case to the inside of the printer.
14 1303218 【主要元件符號說明】 1:送紙機構 11 :支承件 111 :第一表面 112 ·•第二表面 113 :凸部 114 :槽孔 115 :容置槽 12 :齒輪 121 :本體 122 :軸桿 13 :夾固板件 131 :開孔 14 :彈性壓持元件 141 :板件 142 :壓持件 15 :旋轉體 16 :紙張 17 :齒輪組14 1303218 [Description of main component symbols] 1: Paper feed mechanism 11: Support member 111: First surface 112 • Second surface 113: Projection 114: Slot 115: accommodating groove 12: Gear 121: Body 122: Shaft Rod 13 : clamping plate member 131 : opening 14 : elastic pressing member 141 : plate member 142 : pressing member 15 : rotating body 16 : paper 17 : gear set
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