201223689 六、發明說明： 【發明所屬之技術領域】 本發明係與工具機之防塵護蓋有關，特別是關於一種 以一板體彎折成形之防塵護蓋。 【先前技術】 工具機之伸縮防塵裝置係由多數形狀類同但尺寸遞增 Φ 之防塵護蓋依序套接’而形成一可隨工具機之軸向運動而 伸展或縮合之裝置。習用之防塵護蓋主要包含有由一板體 一體彎折成具有一頂板及二側板且斷面呈门形之一主體， 他缩防塵裝置中除了尺寸最小之護蓋之外，其他各護蓋係 以其主體之前端套接於另一尺寸較小之護蓋的主體後端； 各該防塵護蓋之後端更設有一背板，其功能除了防止該護 蓋與另-相鄰護蓋分離之外，更可用以阻擋該護蓋之主體 外，面上的殘油及碎屑進入該護蓋之内部。然而，該防塵 • €蓋之主體及背板需先分別經備料、裁切、f折或鑽孔等 加工後，再以焊接方式相互固定，因而在製作上需花費相 當多的時間及人力成本，因此仍有待改進。 、 【發明内容】 本發明之主要目的即在於提供一種防塵護蓋其r 一 體的板材直接成形各部位結構，再加以彎折及成形= 合，可有效節省加工及組立之成本及工序，且椹 體化具有較佳之強度。 再件一 201223689 為達成上述目的，本發明所提供之防塵護蓋係由一板 體彎折而成，該防塵護蓋包含有一頂板，具有一前侧邊、 一後側邊、一左側邊及一右側邊；一左側板，係自該頂板 之左側邊一體向下延伸，且該左侧板之一後側邊連接一向 右延伸之左結合板；一右側板，係自該頂板之右側邊一體 向下延伸，且該右側板之一後側邊連接一向左延伸之右結 合板；以及一背板，係自該頂板之後側邊一體向下延伸， 且該背板之左側及右側分別具有一左結合部及一右結合 部’該左結合部及右結合部係分別與該左結合板及右結合 板固接。 本發明所提供另一防塵護蓋，包含有一頂板，具有一 月'j側邊、一後側邊、一左側邊及一右側邊；一左侧板，係 自該頂板之左側邊一體向下延伸；一右側板，係自該頂板 之右側邊一體向下延伸；以及一背板，係自該頂板之後侧 邊一體向下延伸，且該背板之左側及右側分別連接向前延 伸之一左結合板及一右結合板，該左結合板及右結合板係 分別與該左側板及右侧板固接。 藉此’本發明防塵護蓋不但具有習用防塵護蓋之功 能’更重要的是，在製作該防塵護蓋的過程中，其背板的 部份不需另外備料、裁切及加工，因而較為節省時間及人 力。 有關本發明所提供之防塵護蓋的詳細構造、特點、組 裝或使用方式，將於後續的實施方式詳細說明中予以描 述。然而’在本發明領域中具有通常知識者應能瞭解，該 201223689 等詳細說明以及實施本發明所列舉的特定實施例’僅係用 於說明本發明，並非用以限制本發明之專利申請範圍。 【實施方式】 以下將藉由所列舉之實施例配合隨附之圖式，詳細說 明本發:明之技術内容及特徵，其中： 申請人首先在此說明，在以下將要介紹之實施例以及 圖式中，相同之參考號碼，表示相同或類似之元件或其結 構特徵。 請先參閱第一圖至第五圖，本發明一第一較佳實施例 所提供之防塵護蓋10係由一板體20所製成，該板體20 為一預先裁切成特定形狀之金屬板材，具有相對之一外表 面21及一内表面（圖中未示），該板體20可由特定折線 區分為一頂板30、一左側板41、一右側板42、一左結合 板51、一右結合板52、一左底板61、一右底板62，以及 一背板70。 該頂板30係呈矩形，具有一左側邊31、一右側邊 32、一前側邊33及一後側邊34，且該頂板3〇具有分別 由該板體20之外表面21及内表面所形成之一上表面35 及一下表面36 (如第三圖所示）’以及一自該上表面 朝該下表面36凹陷之溝槽37 (如第四圖所示），該溝槽 37係平行且鄰近該後側邊34，且該溝槽37之二端係分別 延伸至該左側邊31及右側邊32。 該左側板41及右側板42係分別一體連接於該頂板 201223689 30之左側邊31及右侧邊32，且該左側板41及右侧板42 係呈矩形’分別具有一與該頂板30之左侧邊31及右側邊 32相對之下側邊412、422，以及相對之一前側邊413、 423及一後侧邊414、424。該左結合板51及右結合板52 係分別一體連接於該左側板41之後側邊414及該右側板 42之後側邊424 ;該左底板61及右底板62係分別一體連 接於該左側板41之下側邊412及該右側板42之下側邊 422。 該背板70係一體連接於該頂板30之後側邊34，且 該背板7〇之左側及右侧分別具有一左結合部71及一右結 合部72 ’該左結合部71之左端及該右結合部72之右端 分別具有二緩衝塊連接槽712、722，且該左結合部71之 右側及該右結合部72之左側分別具有二導引件連接部 73、74。 該防塵護蓋10係藉由將該板體20沿著特定折線朝其 内表面方向彎折而成，使得該左侧板41及右側板42係分 別垂直地自該頂板30左側邊31及右側邊32向下延伸， 該左結合板51係垂直地自該左側板41之後側邊414向右 延伸’該右結合板52係垂直地自該右側板42之後側邊 424向左延伸，該左底板61係垂直地自該左側板41之下 側邊412向右延伸，該右底板62係垂直地自該右側板42 之下側邊422向左延伸。此外，該背板70係與該頂板3〇 垂直地自該頂板30後側邊34向下延伸，且該背板70 < 左結合部71係貼接於該左結合板51之外側，右結合部 201223689 72則係貼接於該右結合板52之外側（如第六圖所示）， 意即’該背板70之左結合部71及右結合部72係分別位 於該左結合板51及右結合板52後方；然而，該背板70 之左結合部71及右結合部72亦可分別連接於該左結合板 51及右結合板52之内侧而位於其前方（圖未示），只要相 互間隔逃開或作逃孔即可構成。另外，該背板70之左側 及右側係分別突伸至該左侧板41及右側板42外側，使得 該左結合部71之緩衝塊連接槽712係位於該左側板41之 左侧’該右結合部72之緩衝塊連接槽722則係位於該右 側板42之右側（如第三圖所示）。再者，前述板體2〇彎 折成形之後，可分別於該左結合部71與該左結合板51貼 接處以及該右結合部72與該右結合板52貼接處施以點焊 作業，即可定型該防塵護蓋1〇。 前述本發明所提供之防塵護蓋10中，該頂板30、左 側板41、右侧板42、左底板61及右底板62形成該防塵 濩蓋10之一主體，係用以套接於另一尺寸較小之防塵護 蓋1〇的主體後端，而該背板7〇之功能除了防止二相鄰防 塵護蓋1〇脫離之外，更可利用該等緩衝墊連接槽712、 722分別装設一緩衝墊12，以減低相鄰防塵護蓋10接觸 時所產生之噪音及振動，並可利用該等導引件連接部 73、74分別裝設一為滾輪或滑塊之導引件μ，以使相鄰 防塵護蓋10之間的相對運動更加順暢。另外，該頂板 30、左侧板41及右側板42之前側邊33、413、423可用 以分別設置一刮刷片16 (如第二圖所示），以刮除該防塵 201223689 護蓋10所套接之較小防塵護蓋10之外表面21上的殘油 及碎屑，且該頂板30之溝槽37更可防止該等殘油及碎屑 經由該頂板30之後側邊34進入到該防塵護蓋1〇内部。 更重要的是’在製作該防塵護蓋10的過程中，該背板7〇 的部份不需與其他部份分開備料、裁切及加工，因而較為 節省時間及人力。 如第七圖所示’本發明一第二較佳實施例更提供另— 防塵護蓋80，係由如第八圖所示之一板體81彎折而成， 其與前述該板體20之主要差別在於該板體81之頂板 3〇、左側板41及右側板42的前側邊33、413、423更分 別一體連接一第一前板82、一第二前板84及一第三前板 86 ;藉此，將該板體81彎折成該防塵護蓋80後，如第七 圖所示，該第一前板82係與該頂板30垂直地自該頂板 30前側邊33向下延伸，該第二前板84係與該左側板41 垂直地自該左側板前側邊413向右延伸，該第三前板86 係與該右側板42垂直地自該右側板前側邊423向左延 伸。在將多數尺寸遞增之防塵護蓋依序套接成一工具 機之伸縮防塵裝置時，尚需在尺寸最大的防塵護蓋10後 端套接該防塵護蓋80，並將該第一、第二、第三前板 82、84、86與該工具機之一產生軸向進給運動之床台 (圖中未示）固接，使得該伸縮防塵裝置可隨工具機之軸 向運動而伸展或縮合。 另外，如第九圖所示，本發明一第三較佳實施例提供 再一防塵護蓋90 ’係由如第十圖所示之板體91彎折而 201223689 成’其頂板92具有一頂脊922，且該頂板92係自該頂脊 922分別朝其左侧邊924及右側邊926向下倾斜，藉此， 該防塵護蓋90更可避免其外表面留有殘油及碎屑，且因 同樣係由同一板體91彎折而成，因此製作上亦具有節省 時間及人力成本之優點。 丨值得一提的是，前述該等實施例所提供之防塵護蓋 10 S 80、90中’該左結合板51及右結合板52可分別與 具有該等緩衝塊連接槽712、722之部分位置對調。請參 閱第十一圖至第十三圖，以防塵護蓋1〇之右半部為例 (左、右半部呈對稱）’其右結合板52可一體連接於該背 板70之右側’並在彎折後朝向前方延伸，再與該右側板 42固接；另外，該右側板42之後側邊424 —體連接一緩 衝塊連接板44 ’且該緩衝塊連接板44係被向右彎折，緩 衝塊連接槽即構成在左右側板以設置緩衝墊。 最後，必須再次說明，本發明於前揭實施例中所揭露 的構成元件，僅為舉例說明，並非用來限制本案之範圍， 其他等效元件的替代或變化，亦應為本案之申請專利範圍 所涵蓋。 201223689 【圖式簡單說明】 第一圖為本發明一第一較佳實施例所提供之防塵護蓋 彎折成形前之頂視圖； 第二圖為本發明該第一較佳實施例所提供之防塵護蓋 彎折成形後之前視圖，係顯示其設有緩衝墊、導引件及刮 刷片之態樣， 第三圖為第二圖之局部放大圖，惟顯示本發明該第一 較佳實施例所提供之防塵護蓋未設有緩衝塾、導引件及刮 刷片之態樣； 第四圖為本心明該第一較佳實施例所提供之防塵護蓋 彎折成形後之側視圖，係顯示纽有_墊、導引件 刷片之態樣； 第五圖為第四圖之局部放大圖，惟顯示本發明該第— 較佳實施例所提供之防錢蓋未設有緩衝墊、導引件及 刷片之態樣； 第六圖為第三圖沿6、6剖線之剖視圖； 第七圖為本發明〜第二較佳實施例所提供之防塵護蓋 彎折成形後之前視圖； 第八圖為本發明讀第二較佳實施例所提供之防塵護蓋 彎折成形前之頂視圖； 第九圖為本發明〜第三較佳實施例所提供之防塵護蓋 彎折成形後之前視圖； 第十圖為本發明該第三較佳實施例所提供之防塵護蓋 彎折成形前之頂視圖； 201223689 第十一圖為本發明一第四較佳實施例所提供之防塵護 蓋彎折成形前之局部頂視圖； 第十二圖為本發明該第四較佳實施例所提供之防塵護 蓋彎折成形後之局部前視圖；以及 第十三圖為第十二圖沿13-13剖線之剖視圖。 【主要元件符號說明】201223689 VI. Description of the Invention: [Technical Field] The present invention relates to a dustproof cover for a machine tool, and more particularly to a dustproof cover formed by bending a plate body. [Prior Art] The telescopic dustproof device of the machine tool is sequentially sleeved by a plurality of dustproof covers of the same shape but with an increasing size Φ to form a device which can be extended or condensed with the axial movement of the machine tool. The conventional dustproof cover mainly comprises a main body which is integrally bent by a plate body to have a top plate and two side plates and has a door shape in section, and the other cover parts except the smallest cover in the dust reduction device The front end of the main body is sleeved on the rear end of the main body of another smaller size cover; each rear end of the dust protection cover is further provided with a back plate, the function of which is to prevent the cover from being separated from the other adjacent cover In addition, it can be used to block the outside of the body of the cover, and the residual oil and debris on the surface enter the inside of the cover. However, the main body and the back plate of the dustproof cover must be processed by cutting, cutting, f-folding or drilling, and then fixed by welding, so that it takes a lot of time and labor cost in production. Therefore, there is still room for improvement. SUMMARY OF THE INVENTION The main object of the present invention is to provide a dustproof cover with a r-integrated plate directly forming the structure of each part, and then bending and forming = combined, which can effectively save the cost and process of processing and assembly, and The body has a better strength. In order to achieve the above object, the dustproof cover provided by the present invention is formed by bending a plate body, and the dustproof cover comprises a top plate having a front side, a rear side and a left side. a right side panel; a left side panel extending downwardly from the left side of the top panel, and a rear side of the left side panel is connected to a left joint panel extending to the right; a right side panel is from the right side of the top panel The one side of the right side panel is connected to the right side of the right side panel; and the back side panel is integrally extended downward from the rear side of the top board, and the left side and the right side of the back board respectively have The left joint portion and the right joint portion of the left joint portion and the right joint portion are respectively fixed to the left joint plate and the right joint plate. Another dustproof cover provided by the present invention comprises a top plate having a first side, a rear side, a left side and a right side; a left side panel, which is integrally downward from the left side of the top board Extending; a right side panel extending downwardly from the right side of the top panel; and a back panel extending integrally downward from the rear side of the top panel, and the left side and the right side of the back panel are respectively connected to extend forwardly The left binding plate and the right combining plate are respectively fixed to the left side plate and the right side plate. Therefore, the dustproof cover of the present invention not only has the function of the conventional dustproof cover, but more importantly, in the process of manufacturing the dustproof cover, the part of the back plate does not need to be separately prepared, cut and processed, and thus Save time and manpower. The detailed construction, features, assembly or use of the dust shield provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not to be construed as limiting the scope of the invention. [Embodiment] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and the technical contents and features of the present invention will be described in detail. The applicant first describes here, the embodiments and the drawings which will be described below. Where the same reference numbers indicate the same or similar elements or structural features thereof. Referring to the first to fifth figures, a dustproof cover 10 according to a first preferred embodiment of the present invention is made of a plate body 20 which is pre-cut into a specific shape. The metal plate has a relatively outer surface 21 and an inner surface (not shown). The plate 20 can be divided into a top plate 30, a left side plate 41, a right side plate 42, and a left combined plate 51 by a specific fold line. A right binding plate 52, a left bottom plate 61, a right bottom plate 62, and a back plate 70. The top plate 30 has a rectangular shape and has a left side 31, a right side 32, a front side 33 and a rear side 34, and the top plate 3 has a surface 21 and an inner surface respectively of the plate 20 Forming an upper surface 35 and a lower surface 36 (as shown in the third figure) and a groove 37 recessed from the upper surface toward the lower surface 36 (as shown in the fourth figure), the grooves 37 are parallel And adjacent to the rear side 34, and the two ends of the groove 37 extend to the left side 31 and the right side 32, respectively. The left side plate 41 and the right side plate 42 are integrally connected to the left side 31 and the right side 32 of the top plate 201223689 30, respectively, and the left side plate 41 and the right side plate 42 are respectively rectangular and have a left side with the top plate 30 respectively. Side edges 31 and right side edges 32 are opposite side edges 412, 422, and a pair of front side edges 413, 423 and a rear side edge 414, 424. The left side plate 51 and the right side plate 52 are integrally connected to the rear side 414 of the left side plate 41 and the rear side 424 of the right side plate 42. The left bottom plate 61 and the right bottom plate 62 are integrally connected to the left side plate 41, respectively. The lower side 412 and the lower side 422 of the right side plate 42. The back plate 70 is integrally connected to the rear side 34 of the top plate 30, and the left side and the right side of the back plate 7b have a left joint portion 71 and a right joint portion 72', and the left end of the left joint portion 71 The right end of the right joint portion 72 has two buffer block connecting grooves 712 and 722, and the right side of the left joint portion 71 and the left side of the right joint portion 72 respectively have two guide connecting portions 73 and 74. The dustproof cover 10 is formed by bending the plate body 20 along a specific fold line toward the inner surface thereof such that the left side plate 41 and the right side plate 42 are vertically perpendicular to the left side 31 and the right side of the top plate 30, respectively. The side 32 extends downwardly, and the left coupling plate 51 extends vertically from the rear side edge 414 of the left side plate 41. The right coupling plate 52 extends vertically from the rear side edge 424 of the right side plate 42 to the left. The bottom plate 61 extends vertically from the lower side 412 of the left side plate 41, and the right bottom plate 62 extends vertically from the lower side 422 of the right side plate 42 to the left. In addition, the back plate 70 extends downward from the rear side 34 of the top plate 30 perpendicularly to the top plate 3, and the back plate 70 < the left joint portion 71 is attached to the outer side of the left joint plate 51, right The joint portion 201223689 72 is attached to the outer side of the right joint plate 52 (as shown in FIG. 6 ), that is, the left joint portion 71 and the right joint portion 72 of the back plate 70 are respectively located on the left joint plate 51 . The rear side of the right side of the left side panel 51 and the right side of the right side panel 52 are respectively connected to the front side of the left side panel 51 and the right side of the right side panel 52 (not shown). They can be constructed by escaping or escaping from each other. In addition, the left side and the right side of the back plate 70 respectively protrude to the outside of the left side plate 41 and the right side plate 42 such that the buffer block connecting groove 712 of the left joint portion 71 is located on the left side of the left side plate 41. The buffer block connection groove 722 of the joint portion 72 is located on the right side of the right side plate 42 (as shown in the third figure). Further, after the plate body 2 is bent and formed, the spot bonding operation may be performed at the joint of the left joint portion 71 and the left joint plate 51 and the joint of the right joint portion 72 and the right joint plate 52. , the dust cover can be shaped. In the dustproof cover 10 provided by the present invention, the top plate 30, the left side plate 41, the right side plate 42, the left bottom plate 61 and the right bottom plate 62 form a main body of the dustproof cover 10 for being sleeved to another The rear end of the main body of the small-sized dustproof cover 1 ,, and the function of the back plate 7〇 can be used to prevent the two adjacent dustproof covers 1 〇 from being detached, and the cushion connecting grooves 712 and 722 can be respectively used. A cushion pad 12 is provided to reduce the noise and vibration generated when the adjacent dustproof cover 10 is in contact with each other, and the guide members connecting portions 73 and 74 are respectively provided with a guide member for the roller or the slider. In order to make the relative movement between adjacent dustproof covers 10 smoother. In addition, the top side 30, the left side panel 41, and the front side panel 33, the front side edges 33, 413, 423 can be used to respectively provide a wiper blade 16 (as shown in the second figure) to scrape the dustproof 201223689 cover 10 The residual oil and debris on the outer surface 21 of the smaller dustproof cover 10 are sleeved, and the groove 37 of the top plate 30 prevents the residual oil and debris from entering the side 34 through the rear side 34 of the top plate 30. The dust cover is 1 inside. More importantly, in the process of manufacturing the dustproof cover 10, the portion of the back plate 7〇 does not need to be separately prepared, cut and processed from other parts, thereby saving time and manpower. As shown in the seventh figure, a second preferred embodiment of the present invention further provides a dustproof cover 80 which is formed by bending a plate body 81 as shown in FIG. 8 and the plate body 20 as described above. The main difference is that the front side 3, the left side 41, and the front side 33, 413, 423 of the left side panel 42 are integrally connected to a first front panel 82, a second front panel 84, and a third. The front plate 86; thereby, after the plate body 81 is bent into the dustproof cover 80, as shown in the seventh figure, the first front plate 82 is perpendicular to the top plate 30 from the front side 33 of the top plate 30. Extending downwardly, the second front panel 84 extends rightward from the left side panel front side 413 perpendicular to the left side panel 41. The third front panel 86 is perpendicular to the right side panel 42 from the right side panel front side 423. Extend to the left. When the dustproof cover with a plurality of incremental sizes is sequentially sleeved into a telescopic dustproof device of a machine tool, the dust cover 80 needs to be sleeved at the rear end of the largest size dustproof cover 10, and the first and second portions are The third front plate 82, 84, 86 is fixed to a bed (not shown) for generating an axial feed motion of the machine tool, so that the telescopic dustproof device can be extended with the axial movement of the machine tool or condensation. In addition, as shown in the ninth embodiment, a third preferred embodiment of the present invention provides that the dustproof cover 90' is bent by the plate 91 as shown in the tenth figure and the 201223689 is formed with a top plate 92 having a top. The ridge 922, and the top plate 92 is inclined downward from the top ridge 922 toward the left side 924 and the right side 926, respectively, thereby preventing the dust cover 90 from leaving residual oil and debris on the outer surface. Moreover, since the same plate body 91 is bent, the production also has the advantages of saving time and labor cost. It is to be noted that the left cover plate 51 and the right combination plate 52 of the dustproof cover 10 S 80, 90 provided in the foregoing embodiments may respectively be combined with the buffer block connection grooves 712, 722. Position is reversed. Please refer to the eleventh to thirteenth figures, taking the right half of the dustproof cover 1〇 as an example (the left and right halves are symmetrical) 'the right binding plate 52 can be integrally connected to the right side of the back plate 70' And extending to the front after bending, and then being fixed to the right side plate 42. In addition, the rear side 424 of the right side plate 42 is connected to a buffer block connecting plate 44' and the buffer block connecting plate 44 is bent to the right. Folding, the buffer block connecting groove is formed on the left and right side plates to provide a cushion. Finally, it is to be noted that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention. Covered. 201223689 [Simplified illustration of the drawings] The first figure is a top view of the dustproof cover provided before the bending forming of the first preferred embodiment of the present invention; the second figure is provided by the first preferred embodiment of the present invention. The front view of the dustproof cover is formed by the cushion, the guide member and the wiper blade. The third figure is a partial enlarged view of the second figure, but shows the first preferred embodiment of the present invention. The dustproof cover provided in the embodiment is not provided with the buffer damper, the guiding member and the squeegee; the fourth figure is the bending protection of the dustproof cover provided by the first preferred embodiment of the present invention. The side view shows a state in which the button has a pad and a guide piece; the fifth figure is a partially enlarged view of the fourth figure, but shows that the anti-money cover provided in the first preferred embodiment of the present invention is not provided. FIG. 6 is a cross-sectional view taken along line 6 and 6 of the third drawing; and seventh is a dustproof cover bending provided by the second to fourth preferred embodiments of the present invention; Folded front view; eighth figure is a dust cover provided by the second preferred embodiment of the present invention FIG. 9 is a front view of the dustproof cover provided by the third preferred embodiment of the present invention; FIG. 10 is a dustproof view of the third preferred embodiment of the present invention; Top view of the protective cover before bending and forming; 201223689 FIG. 11 is a partial top view of the dustproof cover provided before the bending forming of the fourth preferred embodiment of the present invention; A partial front view of the dustproof cover provided by the preferred embodiment after being bent and formed; and a thirteenth view is a cross-sectional view taken along line 13-13 of the twelfth figure. [Main component symbol description]
防塵護蓋10 緩衝墊12 導引件14 刮刷片16 板體20 外表面21 頂板30 左側邊31 右側邊32 前側邊33 後側邊34 上表面35 下表面36 溝槽37 左側板41 下側邊412 前側邊413 後側邊414 右側板42 下側邊422 前側邊423 後側邊424 緩衝塊連接板44 左結合板51 右結合板52 左底板61 右底板62 背板70 左結合部71 緩衝塊連接槽712 右結合部72 緩衝塊連接槽722 導引件連接部73 201223689 導引件連接部74 防塵護蓋80 第一前板82 第三前板86 防塵護蓋90 頂脊922 右側邊926 板體81 第二前板84 頂板92 左側邊924 板體91Dust cover 10 cushion 12 guide 14 wiper 16 plate 20 outer surface 21 top plate 30 left side 31 right side 32 front side 33 rear side 34 upper surface 35 lower surface 36 groove 37 left side plate 41 Side 412 Front side 413 Rear side 414 Right side panel 42 Lower side 422 Front side 423 Rear side 424 Buffer block connecting plate 44 Left joint plate 51 Right joint plate 52 Left bottom plate 61 Right bottom plate 62 Back plate 70 Left joint Portion 71 Buffer block connection groove 712 Right joint portion 72 Buffer block connection groove 722 Guide member connection portion 73 201223689 Guide member connection portion 74 Dust cover 80 First front plate 82 Third front plate 86 Dust cover 90 Top ridge 922 Right side 926 board 81 second front board 84 top board 92 left side 924 board 91
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