1285146 狄、發明說明： 【發明所屬之技術領域】 種研磨機的 本t月疋有關於一種研磨機，特別是指 工件夾座與多夹具組合體。 【先前技術】 a現有的精密研磨機是在一基座一側設有—可夹持呈 ^、棒狀工件的工件夹座，另一側犷一 、 βπ ^ 77 -k AL y- 、σ又有一可放設砂輪、 内仫刀或外徑刀.··等研磨件的刀 10 15 20 件的相對運動以進行研磨作業。' _§亥工件與研磨 配的:，隨著工件特大、小的列，該工件夾座上所搭 Γ夾：也會不同，例如發明人所申請之第8_5號 〃所揭路之-種雙滾輪式夾具’特別適合中、小外徑的工 :’且可快速夾持。另外’如發明人所中請之第89216305 “，又揭露-種三爪夾頭，特別適合大外徑的工件。而 現有的精密研磨機的卫件夾座都只採用單-種夾具的設 計，導致使用者若欲對不同外徑的工件進行研磨作業時， 就必須購置多台具有不同爽具之研磨機，這樣一來，卻會 耗費較多的購置費用。 【發明内容】 因此’本發明之目的，即在提供一種針對不同外徑之 件而在工件夾座上選擇組配不同型式的夹具單元，以 降低購置費用之研磨機的工件夹座與多失具組合體。 本發明研磨機的工件夾座與多夾具組合體，該研磨機 是可對一工件進行研磨且更具有一基座、-裝設在該基座 5 1285146 一側的馬達、一可產生橫、縱向位移的刀具座及一裳設在 該刀具座上的研磨件。該組合體包含一工件夾座、一組設 在該工件夾座中的第一夾具單元、一可替代該第一夾具單 元之一弟一滾輪而組設在該工件夾座中的第二夾具單 5 元、一可替代a亥苐一爽具早元之一第二滾輪而組設在該工 件夾座中的第三夹具單元及一可替代該第一夾具單元之 一第二滾輪而組設在該工件夾座中的第四夾具單元。該工 件夾座具有一第一軸孔及一平行設置在該第一軸孔一側 的第二軸孔’該第一、二軸孔的孔徑相等。該第一央具單 1〇 元具有二固設在該第一、二軸孔中的襯筒、一軸設在其中 一個襯筒中第一滾輪、一可軸設在另一個襯筒中的第二滾 輪及一可擺動地設置在該第一、二滾輪中間上方且可將該 工件壓制定位的抵壓輪，該第一、二滾輪受該馬達驅動可 朝相同方向轉動。該第二夾具單元是受該馬達驅動而轉 15 _ i具有®没在该第二軸孔中的襯筒、-軸設在該襯 筒中的軸桿、一套設在該軸桿一端部中的束夾件及一對應 該束夾件而螺設在該軸桿上的掣動件，該束夾件具有一π 一軸線設置的插孔、數沿徑向設置且可由貫穿至該插孔3 切縫，該束夾件與該軸桿是以錐面相套合，操作轉動該擎 20 自件可使4束夾件沿軸線產生位移，且利用該等切縫而改 變該插孔的孔徑。該第三夾具單元具有一可組設在該第二 軸孔頂針組及_設置在該前頂針組—侧的後頂針 二）後頂針組各具有一位在同一軸線且可供該工件 頂持定位的頂針。該第四夾具單元具有一可組設第二轴孔 1285146 中的夹頭組，該夾頭組具有一固設在該第二軸孔中的襯 筒、一裝設在該襯筒中的轴管、一軸設在該軸管上的旋 塊、一鎖固在該旋塊上的主體及數裝設在該主體上且可將 該工件夾持定位的夾爪塊。藉此，利用該等夾具單元分別 5 與該工件夾座配合，可夾持不同外徑之工件進行研磨作 業。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之四較佳實施例的詳細說明中，將可清 10 楚的明白。 如圖1所示，本發明研磨機的工件夾座與多夾具組合 體之第一較佳實施例，該研磨機100是可對一工件200進 行研磨且更具有一基座110、一裝設在該基座110 一侧的 15 馬達I20，、一可產生橫、縱向位移的刀具座130及一裝設 15 在該刀具座130上的研磨件140 (本實施例是以砂輪為 =)。該組合體包含一裝設在該基座11〇上的工件夾座1〇、 可扁。又在该工件夾座10上的第一夾具單元2〇。 配e參閱圖2、圖3及圖4所示，該工件夾座具 2〇 冑帛一轴孔11、一沿水平方向設置在該第一軸孔U 一 一1的的第_軸孔丨2及一凹設在一侧面且可涵蓋該第一、 孔11、12的凹陷部⑴該馬達120是裝設在該工件 失座10 —側，且一受該馬達12〇驅動的驅動輪15〇是設 置在該凹陷部13中。 ° 該第一夾具單元20具有二以螺絲鎖固在該第一、二 7 1285146 5 10 15 軸孔11、12中的襯筒25、一對應該第一軸孔11而軸設在 其中一個襯筒25中的第一滾輪21、一對應該第二軸孔12 而軸設在另一個襯筒25中的第二滾輪22及一軸設在一懸 臂24底部且可擺動地設置在該第一、二滾輪21、22中間 上方的抵壓輪23。該第一、二滾輪21、22各具有一伸設 在該襯筒25中的第一軸桿211、221、一固接在該第一、 二軸桿211、221 —端部且伸設在該第一、二軸孔11、12 外部的轉輪部212、222及一固設在該第一軸桿211、221 另一端部且設置在該凹陷部13中的從動輪213、223，該 從動輪213、223受該驅動輪150聯動可使該第一、二滾 輪21、22整體朝相同方向轉動，且掣動工件2〇〇產生旋 轉動作。該懸臂24是樞設在該工件夾座1 〇頂部，該抵壓 輪23可將該工件200壓制定位在該第一、二滾輪21、22 之間。 當在該工件夾座10上組配該第一夾具單元2〇時，適 合對中、小外徑之工件200進行研磨作業，且操作該懸臂 24疑擺，就可使該抵壓輪23趨近或遠離該第一、二滾輪 21、22 ’且可達到快速夾持、鬆釋工件2〇〇之目的。 再如圖5 '圖6所示，本發明研磨機的工件夾座與多 夾具組合體之第二較佳實施例，是在該工件夾座1〇中組 配^ 一第二爽具單$ 30。該第二夾具單元30《可f代第 -：施例的第二滾輪22而軸設在該第二軸孔12中，並且 有一以螺絲鎖固在該第二轴孔12中的襯筒34、—轴設在 该襯筒34中且受該馬達12。驅動而轉動的第二軸桿31、 20 1285146 一套設在該第二軸桿31 一端部中的束夾件32及一對應該 束失件32而螺設在該第二軸桿31上的掣動件33。 該第二軸桿31具有一伸設在該襯筒34中的轴桿部 5 m、—固接在該軸桿部311 一端部且伸設在該第二軸孔 '外部的頭㈣2、-由該頭部犯之一端面沿轴線^ 且主外寬内窄狀的錐孔313及一設在該頭部312 的外螺紋314。 邊束夾件32具有-沿-軸線延伸且可界定出—插孔 10 的内周面奶、-與該内周面322相背設置的外周面 23、多數由該外周面323貫穿至内周面奶的切縫似 及多數由該外周面322凹設但未貫穿至内周面把的輔助 立逄324。5亥外周面323具有一對應該錐孔313的第一錐 °H25、-沿該軸線設於該第一錐部咖一側的第二雜部 326 ’該第二錐部是由與該第一錐部挪銜接處沿軸 線逐漸向内傾斜延伸，且該束爽件32是利用該第—錐部 犯5與該第二軸桿31的錐孔313以雜面相套合。 ,3亥掣動件33具有一圍繞該軸線且對應該第二錐部犯6 1掣壓錐面331及-設置在該掣壓錐面331 —側且螺設在 该頭部312之外螺，纹314上的内螺紋咖。 Z〇 _藉此’當㈣動件33相對於該頭部犯朝外旋鬆時， 〇束夾件32的插孔321就具有較大之外徑，且⑭工件 _插置。當轉動該f動件33相對於頭部312朝内旋緊 日守，可利用該掣動件33對束夾件32產生推掣作用，且使 違束失件32沿轴線朝錐孔313内部產生位移，該束失件 1285146 32受到該錐孔313的約束以及利用該等切縫324、辅助切 縫324’的設置，就可使該插孔321的孔徑變小，並對工件 200產生束夾之作用。 因此，利用操作該掣動件33就可對工件200產生束 5 緊或鬆釋作用，操作動作相當簡單。且本實施例適用於外 徑較小的工件200。 又如圖7、圖8所示，本發明研磨機的工件夾座與多 夾具組合體之第三較佳實施例，是利用一第三夾具單元4〇 夾持工件200。該第三夾具單元4〇具有一可替代該第二滾 10 輪22而軸設在該工件夾座1 〇之第二軸孔丨2中的前頂針 組41、一固設在該工件夾座10上的支架42及一呈可移動 地裝設在該支架42上且與該前頂針組41對應設置的後頂 針組43。該前頂針組41具有一以螺絲鎖設在該第二軸孔 12中的襯筒411、一套設在該襯筒411中的軸管412、_ 15 套設在該軸管412内部的前頂針413。該後頂針組43亦具 有一後座體431及一套設在該後座體431内部且與該前頂 針413位在同一軸線上的後頂針432，該前、後頂針413、 432可將該工件200頂持定位。藉此，當工件2〇〇被該前、 後頂針413、432夾制頂持，就可驅動該研磨件14〇相對 20 方、工件200進行研磨作業，且本實施例亦較適用於外徑較 小的工件200。 再如圖9、圖1 Q所示，本發明研磨機的工件夾座與 多夾具組合體之第四較佳實施例，是利用一第四夾具單元 50夾持工件200。該第四夾具單元5〇具有一可替代該第 10 1285146 二滾輪22而軸設在該工件夾座ι〇第二軸孔12中的夾頭 組51、一固設在該工件夾座側邊的固定架52及一固設 在该固定架52上且可驅動該夾頭組51轉動的驅動馬達 53。該夾頭組51具有一以螺絲鎖設在該第二軸孔12中的 襯筒511、一固設在該襯筒511中的軸管512、一轴設在 該軸管512上的旋塊513、一以螺栓鎖固在該旋塊513上 的主體514及數裝設在該主體514上且可將該工件200夾 持定位的夾爪塊515。該旋塊513之周面凹設有一環槽 516，且可供該驅動馬達53以一皮帶531繞設掣動。且當 在該工件夾座1〇上組配該第四夾具單元5〇時，利用該等 夾爪塊515可適合對較大外徑之工件2〇〇進行研磨作業。 因此’利用該工件夹座1 〇分別與第一夾具單元2〇、 第二夾具單元30、第三夾具單元4〇及第四夾具單元5〇組 配’是可適用於不同外徑的工件2〇〇進行研磨，且第一夾 具單兀20、第二夾具單元30、第三夾具單元4〇及第四夾 具單元50的替換操作相當容易，使用者在研磨前可依工 件200外徑而選擇不同的夾具單元組配在該工件夾座1〇 上，故不需要同時購置多台的研磨機，可節省購置費用。 歸納上述，本發明之研磨機的工件夾座與多夾具組合 體，疋可依工件的外徑而在工件夾座上組配不同型式的夾 具單7L，不僅組裝容易、快速，更可節省購置費用，故確 實能達到發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 1285146 範圍及發明說明書内容所作之簡單的等效變化與修飾，皆 應仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一立體圖，說明本發明研磨機的工件夾座與多 夾具組合體的一第一較佳實施例； 圖2是本發明上述較佳實施例之一俯視組合圖，說明 一工件夾座中組配有一第一夾具單元； 圖3是本發明上述較佳實施例之一後視示意圖，說明 一第二夾具單元受一馬達的驅動輪所驅動； 圖4是沿圖3中之線4 — 4的一剖面圖； 圖5是本發明之研磨機的工件夾座與多夾具組合體 一第二較佳實施例的一俯視組合圖； 圖6是沿圖5中之線6 — 6的一剖面圖； 圖7是本發明之研磨機的工件夾座與多夾具組合體 一第三較佳實施例的一俯視組合圖； 圖8是沿圖7中之線8 — 8的一剖面圖； 圖9是本發明之研磨機的工件夾座與多夾具組合體 一第四較佳實施例的一俯視組合圖；及 圖1 〇是沿圖9中之線1 0 — 1 0的一剖面圖。 12 1285146 【圖式之主要元件代表符號簡單說明】 100 研磨機 311 軸桿部 110 基座 312 頭部 120 馬達 313 錐孔 130 刀具座 314 外螺紋 140 研磨件 32 束夾件 10 工件夾座 321 插孔 11 第一軸孔 322 内周面 12 第二軸孔 323 外周面 13 凹陷部 324 切縫 20 第一夾具單元 324’ 輔助切縫 21 弟一滾輪 325 第一錐部 211 第一軸桿 326 第二錐部 212 轉輪部 33 掣動件 213 從動輪 331 掣壓錐面 22 第二滾輪 332 内螺紋 221 第一軸桿 34 襯筒 222 轉輪部 40 第三夾具單元 223 從動輪 41 前頂針組 23 抵壓輪 411 襯筒 24 懸臂 412 軸管 25 襯筒 413 前頂針 30 第二夾具單元 42 支架 31 第二軸桿 43 後頂針組 13 1285146 431 後座體 514 主體 432 後頂針 515 夾爪塊 50 第四夾具單元 516 環槽 51 夾頭組 52 固定架 511 襯筒 53 驅動馬達 512 軸管 531 皮帶 513 旋塊 200 工件 141285146 Di, invention description: [Technical field to which the invention pertains] The present invention relates to a grinder, and more particularly to a workpiece holder and a multi-clamp assembly. [Prior Art] A conventional precision grinding machine is provided on one side of a base - a workpiece holder that can hold a workpiece of a rod and a rod, and the other side is 犷, βπ ^ 77 -k AL y- , σ Further, there is a relative movement of the blade 10 15 20 which can be placed with a grinding wheel, an internal boring tool or an outer diameter knives. '_§Hai workpiece and grinding:: With the extra large and small columns of the workpiece, the clamps on the workpiece holder: will also be different, for example, the inventor's application No. 8_5 The double roller clamp is especially suitable for medium and small outer diameters: 'and can be clamped quickly. In addition, as in the inventor's request No. 89216305, "the three-jaw chuck is also disclosed, which is especially suitable for workpieces with large outer diameters. The existing precision grinding machine's guard holders are only designed with single-clamps. If the user wants to grind the workpieces with different outer diameters, it is necessary to purchase a plurality of grinders with different refreshing devices, which will cost more purchases. [Summary] SUMMARY OF THE INVENTION It is an object of the present invention to provide a workpiece holder and a multi-failure assembly for a grinder of a different type of outer diameter for selecting different types of gripper units on a workpiece holder to reduce the cost of purchase. The workpiece holder and the multi-clamp assembly of the machine, the grinding machine is capable of grinding a workpiece and further has a base, a motor mounted on one side of the base 5 1285146, and a lateral and longitudinal displacement a tool holder and an abrasive member disposed on the tool holder. The assembly comprises a workpiece holder, a set of first clamp units disposed in the workpiece holder, and a substitute for the first clamp unit One roll And the second clamp unit disposed in the workpiece holder is 5 yuan, and the third clamp unit and the third clamp unit disposed in the workpiece holder are replaced by a second roller. a fourth clamp unit assembled in the workpiece holder instead of the second roller of the first clamp unit. The workpiece holder has a first shaft hole and a first parallel arrangement on a side of the first shaft hole The two axial holes have the same apertures of the first and second axial holes. The first central device has one of two liners fixed in the first and second axial holes, and one shaft is disposed in one of the liners. a roller, a second roller axially disposed in the other liner, and a pressing wheel rotatably disposed above the first and second rollers and capable of pressing and positioning the workpiece, the first and second rollers are The motor drive can be rotated in the same direction. The second clamp unit is driven by the motor and rotates 15_i with a liner not in the second shaft hole, a shaft provided in the liner, a set a clip member disposed in one end portion of the shaft and a pair of tilting members that are screwed on the shaft The bundle member has a π-axis-arranged insertion hole, the number is arranged in a radial direction and can be cut through the insertion hole 3, the bundle clamp member and the shaft rod are sleeved, and the operation is rotated 20 The self-piece can displace the 4 sets of clips along the axis, and use the slits to change the aperture of the jack. The third clamp unit has a set of thimbles that can be assembled in the second shaft hole and The front ejector pin group - the rear ejector pin 2) the rear ejector pin group each has a thimble on the same axis and can be positioned by the workpiece. The fourth clamp unit has a clip that can be assembled in the second shaft hole 1285146 a head set, the chuck set has a liner fixed in the second shaft hole, a shaft tube installed in the liner, a rotating block disposed on the shaft tube, and a lock on the rotation The main body and the number on the block are mounted on the main body and can clamp the workpiece to the positioning jaw block. Thereby, the clamp unit 5 can be used to clamp the workpiece with different outer diameters by using the clamp unit 5 respectively. Perform the grinding operation. The above and other technical contents, features and effects of the present invention will become apparent from the following detailed description of the preferred embodiments of FIG. As shown in FIG. 1 , in a first preferred embodiment of a workpiece holder and a multi-clamp assembly of the grinder of the present invention, the grinder 100 can grind a workpiece 200 and further has a base 110 and a mounting device. A motor I20 on the side of the base 110, a tool holder 130 for generating lateral and longitudinal displacement, and an abrasive member 140 for mounting the tool holder 130 on the base 110 (this embodiment is a grinding wheel ==). The assembly comprises a workpiece holder 1 装 mounted on the base 11 〇 and can be flat. Also on the workpiece holder 10 is a first clamp unit 2''. Referring to FIG. 2, FIG. 3 and FIG. 4, the workpiece holder has 2 shaft holes 11 and a _ shaft hole 设置 arranged in the horizontal direction in the first shaft hole U-1. 2 and a recessed portion (1) recessed on a side and covering the first, hole 11, 12. The motor 120 is mounted on the side of the workpiece missing seat 10, and a driving wheel 15 driven by the motor 12? The crucible is disposed in the recessed portion 13. The first clamp unit 20 has two liners 25 screwed in the first and second 7 1285146 5 10 15 shaft holes 11, 12, and a pair of shaft shafts 11 to be axially disposed on one of the liners a first roller 21 in the cylinder 25, a pair of second rollers 22 that are axially disposed in the other liner 25 and a shaft are disposed at the bottom of the cantilever 24 and are swingably disposed at the first The pressing wheel 23 is located above the middle of the two rollers 21, 22. The first and second rollers 21, 22 each have a first shaft 211, 221 extending in the liner 25, and are fixed to the ends of the first and second shafts 211, 221 and extend therefrom. The outer wheel portions 212, 222 of the first and second shaft holes 11, 12 and the driven wheels 213, 223 fixed to the other end portions of the first shafts 211, 221 and disposed in the recess portion 13, the slave When the driving wheels 213 and 223 are interlocked by the driving wheels 150, the first and second rollers 21 and 22 are rotated in the same direction as a whole, and the workpiece 2 is rotated to generate a rotating motion. The cantilever 24 is pivotally mounted on the top of the workpiece holder 1 , and the pressing wheel 23 can press and position the workpiece 200 between the first and second rollers 21, 22. When the first clamp unit 2 is assembled on the workpiece holder 10, the workpiece 200 suitable for the middle and small outer diameters is subjected to a grinding operation, and the cantilever 24 is operated, and the pressing wheel 23 can be made Close to or away from the first and second rollers 21, 22' and can achieve the purpose of quickly clamping and releasing the workpiece. As shown in FIG. 5 and FIG. 6 , a second preferred embodiment of the workpiece holder and the multi-clamp assembly of the grinder of the present invention is configured to assemble a second refreshing unit in the workpiece holder 1 . 30. The second clamp unit 30 can be axially disposed in the second shaft hole 12 and has a bushing 34 locked in the second shaft hole 12 by a screw. The shaft is disposed in the liner 34 and is subjected to the motor 12. The second shaft 31, 20 1285146 that is driven to rotate is provided with a set of clip members 32 disposed at one end of the second shaft 31 and a pair of bundles 32 to be screwed on the second shaft 31. The tilting member 33. The second shaft 31 has a shaft portion 5 m extending in the liner 34, and a head (4) 2 fixed to the one end of the shaft portion 311 and extending outside the second shaft hole ' The head portion has a tapered hole 313 along the axis ^ and a narrow outer main width, and an external thread 314 provided on the head portion 312. The side band clamp 32 has an inner circumferential surface milk extending along the axis and defining the insertion hole 10, an outer circumferential surface 23 disposed opposite the inner circumferential surface 322, and a plurality of outer circumferential surfaces 323 extending through the inner circumference The slit of the facial milk seems to be a plurality of auxiliary ridges 324 which are recessed by the outer peripheral surface 322 but do not penetrate the inner peripheral surface. The outer peripheral surface 323 of the hai has a pair of first cones H25 and - along the tapered hole 313 The second portion 326 of the first tapered portion is disposed on the side of the first tapered portion. The second tapered portion extends obliquely inwardly along the axis from the first tapered portion, and the bundle 32 is The first tapered portion 5 is engaged with the tapered hole 313 of the second shaft 31 in a matte surface. , the 3 掣 掣 33 has a circumscribing cone 331 around the axis and corresponding to the second cone, and is disposed on the side of the ram 331 and is screwed outside the head 312 , the internal thread coffee on the pattern 314. Z 〇 _ _ When the (four) moving member 33 is loosened outward relative to the head, the insertion hole 321 of the bundle member 32 has a large outer diameter, and 14 workpieces are inserted. When the rotating member 33 is rotated inwardly with respect to the head portion 312, the swaying member 33 can be used to push the bundle member 32, and the escaping member 32 is directed toward the tapered hole 313 along the axis. The internal displacement is generated, and the beam loss member 1285146 32 is restrained by the tapered hole 313 and the arrangement of the slit 324 and the auxiliary slit 324' can make the hole diameter of the insertion hole 321 small and generate the workpiece 200. The role of the bundle clip. Therefore, by operating the damper 33, the workpiece 200 can be subjected to a tightening or releasing action, and the operation is relatively simple. And this embodiment is applicable to the workpiece 200 having a small outer diameter. Further, as shown in Figs. 7 and 8, in the third preferred embodiment of the workpiece holder and the multi-clamp assembly of the grinder of the present invention, the workpiece 200 is held by a third gripper unit 4''. The third clamp unit 4 has a front thimble set 41 which is disposed in the second shaft hole 2 of the workpiece holder 1 instead of the second roller 10, and is fixed to the workpiece holder. A bracket 42 on the 10 and a rear thimble set 43 movably mounted on the bracket 42 and corresponding to the front thimble set 41. The front thimble set 41 has a liner 411 screwed in the second shaft hole 12, and a set of shaft tubes 412, _ 15 disposed in the liner 411 are sleeved inside the shaft tube 412. Thimble 413. The rear thimble set 43 also has a rear seat body 431 and a set of rear thimbles 432 disposed inside the rear seat body 431 and on the same axis as the front thimble 413. The front and rear thimbles 413, 432 can The workpiece 200 is positioned at the top. Thereby, when the workpiece 2 is clamped by the front and rear ejector pins 413, 432, the grinding member 14 can be driven to perform grinding operation with respect to 20 sides and the workpiece 200, and the embodiment is also suitable for the outer diameter. Smaller workpiece 200. Further, as shown in Fig. 9 and Fig. 1Q, in the fourth preferred embodiment of the workpiece holder and the multi-clamp assembly of the grinder of the present invention, the workpiece 200 is held by a fourth gripper unit 50. The fourth clamp unit 5 has a collet set 51 which is disposed in the second shaft hole 12 of the workpiece holder ι instead of the roller 12 of the 10th 1285146, and is fixed on the side of the workpiece holder. The fixing frame 52 and a driving motor 53 fixed on the fixing frame 52 and capable of driving the chuck group 51 to rotate. The chuck set 51 has a liner 511 screwed in the second shaft hole 12, a shaft tube 512 fixed in the liner 511, and a rotating block disposed on the shaft tube 512. 513. A body 514 that is bolted to the rotating block 513 and a plurality of jaw blocks 515 that are mounted on the body 514 and that can clamp the workpiece 200. A circular groove 516 is recessed in the circumferential surface of the rotating block 513, and the driving motor 53 can be swayed by a belt 531. Further, when the fourth gripper unit 5 is assembled on the workpiece holder 1, the gripper block 515 can be used to perform a grinding operation on the workpiece 2 having a large outer diameter. Therefore, 'the workpiece holder 1 〇 is respectively combined with the first clamp unit 2 〇, the second clamp unit 30, the third clamp unit 4 〇 and the fourth clamp unit 5 ' 'is applicable to workpieces 2 having different outer diameters The grinding is performed, and the replacement operation of the first jig unit 20, the second jig unit 30, the third jig unit 4〇, and the fourth jig unit 50 is relatively easy, and the user can select according to the outer diameter of the workpiece 200 before grinding. Different clamp unit groups are arranged on the workpiece holder 1 ,, so it is not necessary to purchase a plurality of grinders at the same time, which can save the purchase cost. In summary, the workpiece holder and the multi-clamp assembly of the grinder of the present invention can be assembled with different types of jigs 7L on the workpiece holder according to the outer diameter of the workpiece, which is not only easy to assemble, but also saves purchase. The cost, so it can really achieve the purpose of the invention. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change and modification of the scope of the invention patent 1285146 and the contents of the invention description. All should remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a first preferred embodiment of a workpiece holder and a multi-clamp assembly of a grinder of the present invention; FIG. 2 is a top plan view of a preferred embodiment of the present invention. Figure 3 is a rear perspective view of a preferred embodiment of the present invention, illustrating a second clamp unit driven by a drive wheel of a motor; Figure 3 is a cross-sectional view of a second embodiment of the workpiece holder and multi-clamp assembly of the grinder of the present invention; Figure 6 is a cross-sectional view of Figure 2 Figure 7 is a top plan view of a third preferred embodiment of the workpiece holder and multi-clamp assembly of the grinder of the present invention; Figure 8 is a line 8 along Figure 7 Figure 8 is a top plan view of a fourth preferred embodiment of the workpiece holder and multi-clamp assembly of the grinder of the present invention; and Figure 1 is a line along line 9 of Figure 9. — A cross-sectional view of 10 0. 12 1285146 [Simplified description of the main components of the drawing] 100 Grinding machine 311 Shaft part 110 Base 312 Head 120 Motor 313 Cone hole 130 Tool holder 314 External thread 140 Abrasive member 32 Beam clamp 10 Workpiece holder 321 Insert Hole 11 first shaft hole 322 inner peripheral surface 12 second shaft hole 323 outer peripheral surface 13 recessed portion 324 slit 20 first clamp unit 324' auxiliary slit 21 second roller 325 first tapered portion 211 first shaft 326 Two-cone portion 212 Rotor portion 33 Rotating member 213 Drive wheel 331 Pressing taper surface 22 Second roller 332 Inner thread 221 First shaft 34 Lining 222 Rotor portion 40 Third clamp unit 223 Drive wheel 41 Front ejector 23 Compression wheel 411 Liner 24 Cantilever 412 Shaft tube 25 Liner 413 Front ejector pin 30 Second clamp unit 42 Bracket 31 Second shaft 43 Rear thimble set 13 1285146 431 Rear seat 514 Body 432 Rear ejector 515 Claw block 50 Fourth clamp unit 516 Ring groove 51 Collet group 52 Fixing frame 511 Liner 53 Drive motor 512 Shaft tube 531 Belt 513 Rotary block 200 Workpiece 14