M342928 八、新型說明： 【新型所屬之技術領域】 本創作與旋孔鑛有關’特別是有關於一種結構簡單， 並可避免夾雜工件切削屑之旋孔鋸。 5【先前技術】 傳統的旋孔鋸在進行工件的的鋸切作業時，會先利用 旋孔鋸之一鑽頭定位出工件的中心點後，再透過—驅動工 具驅動旋孔鑛之一圓穴鋸片轉動，用以將工件鋸切出一 子L。 10 然而，在鋸切作業完成之後而將旋孔鋸之圓穴鋸片從 工件之圓孔中取出時，會有許多的切削屑夾雜在鑽頭上， 使得操作人員必須將夾雜在鑽頭上的切削屑清除乾淨後， 才能再進行下一次的鋸切作業，造成操作人員將會耗費許 多時間在清除切削屑的過程。 15 為了解決上述問題，日本專利實開平6-36714號專利案 ，露出一種用於旋孔鋸之起始中心銷，其具有一可彈性伸 縮的銷頭，以定位工件的中心點而可避免夾雜工件的切削 屑」然而’起始中心銷係利用一彈簧彈性頂抵於旋孔鋸之 2〇 ί部的安裝孔，使起始中心銷可固定於安裝孔中。但是彈 貫的設計卻會讓起始中心銷的整體結構顯得較為複雜。 【新型内容】 本創作之主要目的在於提供一種旋孔鋸，其結構簡 早，並可避免夾雜工件的切削屑。 4 M342928 為達成上述目的，本創作所提供之旋孔鋸包含有一由 金屬材質所製成之圓穴鋸片、一由金屬材質所製成之定位 銷與磁性體。該圓穴鑛片具有一軸孔；該定位銷具有一 插設於該軸孔中之插接段與一可彈性伸縮之銷頭；該磁性 體可设於該圓穴鋸片之軸孔中或設於該定位銷之插接段。 藉此，本創作利用可彈性伸縮的銷頭，可於鋸切作業 時避免夾雜工件的切削屑，另外，該圓穴鑛片之轴孔與該 定位銷之插接段係透過該磁性體的磁力而結合，使本創作 的整體結構較為簡單。 【實施方式】 為了詳細說明本創作之結構、特徵及功效所在，茲舉 以下較佳實施例並配合圖式說明如後。 請參閱第一圖至第三圖，為本創作第一較佳實施例所 15提供之旋孔鋸(10)，包含有一由金屬材質所製成之圓穴鋸片 • (20)、一由金屬材質所製成之定位銷(30)與一磁性體(40)。 • 固穴鑛片（20)的頂端具有一柄部(22) ’用以連接一驅動 工具(圖中未示），使圓穴鑛片（20)可受驅動工具的驅動而轉 動；圓穴鋸片（20)的底端具有複數個鋸齒(24)，用以鋸切工 件；另外，圓穴鋸片（20)的内部具有一軸孔(26)。 定位銷(30)具有一殼體(32)、一銷頭(34)與一彈性件 (36)。殼體(32)具有一中空之身部(322)與一螺接身部(322) 之頭部（324)，使頭部（324)與身部（322)之間形成一穿槽 (38)，其中頭部(324)具有一插接段(326)，可插設於圓穴鑛 5 M342928 片（20)之軸孔(26)中，並於插接段(326)的頂端形成一向上開 放之定位槽(328);銷頭(34)穿過穿槽(38)而突出於殼體(32) 之身部(322)末端，並具有一容槽(342);彈性件(36)位於穿 槽(38)中，並以其兩端分別頂抵殼體(32)之穿槽(38)内壁與 5銷頭(34)之容槽(342)内壁，使銷頭(34)可透過彈性件(36)的 彈力作用而相對殼體(32)彈性伸縮。 磁性體(40)設於定位銷（30)之殼體(32)的定位槽(328) 中，使定位銷(30)之插接段(326)插設於圓穴鋸片（20)之軸孔 (26)中時，可藉由磁性體(4〇)的磁力與圓穴鋸片（2〇)之軸孔 10 (26)結合而不會從軸孔(26)中掉出。 經由上述結構，當使用本創作進行工件的鋸切作業 時，先利用定位銷(30)之銷頭(34)定位出工件的中心點，接 著下壓圓穴鋸片（20)，使圓穴鋸片（20)之鋸齒(24)與工件接 觸，此時的銷頭(34)將伸入殼體(32)之穿槽(38)中而擠壓彈 I5性件(36)，接著再啟動驅動工具以驅動圓穴鋸片（20)轉動， 直到工件被鋸出圓形孔後，銷頭(34)將受彈性件(36)的彈力 作用而向外彈出，使得原本附在銷頭(34)表面之切削屑因慣 性作用被震落。另外，本創作藉由磁性體(40)的磁力將圓穴 鋸片（20)與定位銷(30)結合在一起，會比習用利用彈簧的設 2〇計更為簡單，固定的效果也較好。 當然，磁性體的位置可有多種變化，並不限於第一實 施例所述。如第四圖所示，為本創作第二較佳實施例所提 供之旋孔鋸(50)，磁性體(80)是設置於圓穴鋸片（60)之軸孔 (62)頂端，使得定位銷(70)之插接段(72)插設於轴孔(62)中 6 M342928 (60)與定位鐵 時，同樣可利用磁性體(80)的磁力將圓穴鋸片 (70)結合在一起。 本創作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，亦應林案之申請專·圍所涵蓋。 M342928 【圖式簡單說明】 第一圖為本創作第一較佳實施例之外觀平面圖 第二圖為本創作第一較佳實施例之分解剖視圖 第三圖為本創作第一較佳實施例之組合剖視^ 第四圖為本創作第二較佳實施例之組合剖視^ 圓穴鋸片（20) 鋸齒(24) 定位銷(30) 身部(322) 插接段(326) 銷頭(34) 彈性件(36) 磁性體(40) 圓穴鋸片（60) 定位銷(70) 磁性體(80) 【主要元件符號說明】 旋孔鋸（10) 柄部(22) 10 軸孔(26) 殼體(32) 頭部(324) 定位槽(328) 容槽(342) 15 穿槽(38) 旋孔鋸(50) 轴孔(62) 插接段(72) 8M342928 VIII. New description: [New technical field] This creation is related to the spine ore. In particular, there is a rotary saw with a simple structure and avoiding the inclusion of workpiece scraps. 5 [Prior Art] When the conventional hole saw is used to perform the sawing work of the workpiece, the center point of the workpiece is first positioned by using one of the rotary saws, and then the hole saw is driven by the driving tool. The piece is rotated to cut the workpiece into a sub-L. 10 However, when the saw blade of the rotary saw is taken out of the round hole of the workpiece after the sawing operation is completed, there will be a lot of chips trapped on the drill bit, so that the operator must cut the inclusions on the drill bit. Once the chips have been removed, the next sawing operation can be carried out, causing the operator to spend a lot of time cleaning the chips. In order to solve the above problem, Japanese Patent Laid-Open No. Hei 6-36714 discloses an initial center pin for a hole saw with an elastically expandable pin head for positioning the center point of the workpiece to avoid inclusion. The cuttings of the workpiece "however" the starting center pin is secured to the mounting hole of the rotary saw by a spring-elastic top so that the starting center pin can be fixed in the mounting hole. However, the elastic design will make the overall structure of the starting center pin more complicated. [New content] The main purpose of this creation is to provide a rotary hole saw with a simple structure and avoiding the inclusions of the workpiece. 4 M342928 In order to achieve the above objectives, the rotary saw provided by the present invention comprises a circular saw blade made of metal material, a positioning pin made of metal material and a magnetic body. The locating pin has a shaft hole; the locating pin has a plug portion inserted into the shaft hole and an elastically stretchable pin head; the magnetic body can be disposed in the shaft hole of the circular saw blade or It is disposed on the insertion section of the positioning pin. Therefore, the present invention utilizes an elastically stretchable pin head to avoid chipping of the workpiece during the sawing operation, and the shaft hole of the circular ore piece and the insertion portion of the positioning pin pass through the magnetic body. The combination of magnetic force makes the overall structure of this creation relatively simple. [Embodiment] In order to explain in detail the structure, features and functions of the present invention, the following preferred embodiments are described below with reference to the drawings. Please refer to the first to third figures, the rotary saw (10) provided in the first preferred embodiment of the present invention, comprising a circular saw blade made of metal material (20), a A positioning pin (30) made of a metal material and a magnetic body (40). • The top of the solid hole ore piece (20) has a handle (22) 'for connecting a driving tool (not shown) to rotate the round hole piece (20) by the driving tool; The bottom end of the saw blade (20) has a plurality of serrations (24) for sawing the workpiece; in addition, the inside of the circular saw blade (20) has a shaft hole (26). The positioning pin (30) has a housing (32), a pin head (34) and an elastic member (36). The housing (32) has a hollow body portion (322) and a head portion (324) of the threaded body portion (322) to form a slot between the head portion (324) and the body portion (322). Wherein the head (324) has a plug section (326) that can be inserted into the shaft hole (26) of the 5 M342928 piece (20) of the cave mine and form a top end of the plug section (326). An upwardly extending positioning groove (328); the pin head (34) protrudes through the through groove (38) and protrudes from the end of the body (322) of the casing (32), and has a receiving groove (342); an elastic member (36) ) is located in the through groove (38), and has its two ends respectively abutting against the inner wall of the through groove (38) of the casing (32) and the inner wall of the groove (342) of the 5 pin head (34), so that the pin head (34) The housing (32) can be elastically stretched and contracted by the elastic force of the elastic member (36). The magnetic body (40) is disposed in the positioning groove (328) of the housing (32) of the positioning pin (30), and the insertion portion (326) of the positioning pin (30) is inserted into the circular saw blade (20). In the shaft hole (26), the magnetic force of the magnetic body (4〇) can be combined with the shaft hole 10 (26) of the circular saw blade (2〇) without falling out of the shaft hole (26). Through the above structure, when the sawing operation of the workpiece is performed using the present creation, the pin point (34) of the positioning pin (30) is first used to position the center point of the workpiece, and then the circular saw blade (20) is pressed to make the hole The serrations (24) of the saw blade (20) are in contact with the workpiece, at which point the pin head (34) will extend into the slot (38) of the housing (32) to squeeze the I5 member (36), and then The driving tool is started to drive the circular saw blade (20) to rotate, until the workpiece is sawn out of the circular hole, the pin head (34) will be ejected by the elastic force of the elastic member (36), so that the original is attached to the pin head. (34) The chips on the surface are shaken by inertia. In addition, the present invention combines the circular saw blade (20) with the positioning pin (30) by the magnetic force of the magnetic body (40), which is simpler than the conventional design using the spring, and the fixing effect is also simpler. it is good. Of course, there are many variations in the position of the magnetic body, and it is not limited to the first embodiment. As shown in the fourth figure, the rotary saw (50) provided in the second preferred embodiment of the present invention, the magnetic body (80) is disposed at the top end of the shaft hole (62) of the circular saw blade (60), so that When the insertion section (72) of the positioning pin (70) is inserted into the shaft hole (62) 6 M342928 (60) and the positioning iron, the magnetic force of the magnetic body (80) can also be used to join the circular saw blade (70). Together. The constituent elements disclosed in the foregoing examples are merely illustrative and are not intended to limit the scope of the present invention. The substitution or variation of other equivalent elements should also be covered by the application of the forest case. BRIEF DESCRIPTION OF THE DRAWINGS The first drawing is a plan view of a first preferred embodiment of the present invention. The second drawing is an exploded view of the first preferred embodiment of the present invention. The third drawing is the first preferred embodiment of the present invention. Combination sectional view ^ The fourth drawing is a combination sectional view of the second preferred embodiment of the creation ^ circular hole saw blade (20) sawtooth (24) positioning pin (30) body (322) insertion section (326) pin head (34) Elastic member (36) Magnetic body (40) Round hole saw blade (60) Locating pin (70) Magnetic body (80) [Main component symbol description] Spiral hole saw (10) Handle (22) 10 Shaft hole (26) Housing (32) Head (324) Positioning groove (328) Housing (342) 15 Through groove (38) Screw hole saw (50) Shaft hole (62) Plug section (72) 8