201138900 六、發明說明： 【發明所屬之技術領威】 本發明係與球拍穿線機結構有關，尤指一種球拍穿線 機之拉線裝置。 【先前技術】 如第7圖所系，係為習知之球拍穿線機之拉線裝置， 主要係於一滑座71頂面上固設有一杈線頭7 2，且該滑 • 座7 1係穿設於二呈平行設置之導軌7 3上，而該滑座7 1係在與一繞設於二齒輪7 4上之鏈條7 5相接，並藉一 驅動馬達7 6驅動其中一齒輪7 4而可帶動該鏈條7 5拉 動該滑座7 1沿該導執7 3進行一直線移動。 惟，上述習用之球拍穿線機之拉線裝置，係藉該滑座 7 1於該等導軌7 3上進行滑移動作以達到拉線之目的， 而為確保該滑座71於滑移時之順暢性，因此該滑座7工 • 與該等導軌7 3間之精密度要求極高，且由於拉線時須有 一定之拉線距離’因此該等導執7 3皆具有相當之長度， 而更會導致在精密度控制上越為不易’並進而使製造成本 相對提高；再者，此種拉線裝置除了設置有用以拉動該滑 座7 1之傳動結構外’更須架設有用以穿設於該滑座7 1 兩側之導軌7 3結構，因此更會導致其組成後之拉線襄置 體積較為龐大。 而為降低製造成本，因此如美國第462〇7〇g 201138900 5733212、6227990號專利案係採用螺桿直 接帶動組裝有拉線頭結構之滑座移動，以降低製造成本， 然而上述各專利案於螺桿帶動該滑座移動時，受拉線力道 之影響，將導致該滑座於移動時會與螺桿之間產生有歪斜 偏差之情形，而造成螺桿容易有變形彎曲，以及磨耗過快 之缺點。 故如何改進上述問題，即為本發明之首要課題，因此， 本案發明人係經過不斷的苦思與試作後，才終於有本發明 之產生。 【發明内容】 本發明之主要目的，係在於提供一種球拍穿線機之拉 線裝置，其係具有製造成本低廉，以及可確保於進行拉線 動作時之運作順暢性者。 為達前述之目的，本發明係提供一種球拍穿線機之拉 線裝置，其包含有： 一殼體，呈中空狀，並於其内部周面界定形成有一朝 直線方向延伸之軌槽； 一滑座，係容設於該殼體之執槽中，且於該滑座之兩 相對侧係分別設有可對應滑接於該軌槽周面上之輪體； 一拉線頭，其朝下延伸有一應變計支架，該拉線頭係 以其應變計支架底端而固接於該滑座上，且該拉線頭係外 露於該殼體之頂面上； 201138900 一傳動機構，係與該滑座相接，而可驅動該滑座沿該 執槽滑移，並同步帶動該滑座上之拉線頭進行一直線移動。 其中，該滑座係於其側面之四端處係分別徑向穿設有 一穿孔，而該各穿孔係分別供一外徑略小於該穿孔孔徑之 輪軸穿設，且於該各輪軸露出於該穿孔之兩端上則分別接 設有一輪體，並於呈上下相對設置之二輪軸間係分別設有 二彈抵件，且該二彈抵件係分別彈抵於各輪軸鄰近其輪體 之兩端位置處，並藉該二彈抵件之彈抵而使呈上下相對設 置之各輪體係滑接於該軌槽之頂面及底面上。 而本發明之上述目的與優點，不難從下述所選用實施 例之詳細說明與附圖中，獲得深入了解。 當然，本發明在某些另件上，或另件之安排上容許有 所不同，但所選用之實施例，則於本說明書中，予以詳細 說明。 【實施方式】 請搭配參閱第1圖至第4圖所示，係為本發明所提供 之一種球拍穿線機之拉線裝置，其主要係由一殼體11， 一滑座2 1、一拉線頭3 1以及一傳動機構4 1所組成， 其中： 該殼體1 1，係以鋁擠型方式一體製成中空方管狀， 該殼體1 1頂面係設有一朝直線方向延伸之長溝槽1 2， 且於該殼體11内部周面之四個邊角處係界定形成有一與 該長溝槽1 2呈同方向延伸之執槽1 3，並於該殼體1 1 201138900 相對該執槽13之下方位置處則更擴伸形成有一與該軌槽 1 3相通之容置空間1 4，而於該長溝槽1 2之長軸向侧 邊係朝上凸伸形成有一喪槽1 5，並於該嵌槽1 5中係設 有一可沿該嵌槽1 5滑移之滑蓋1 6。 該滑座2 1，係容設於該殼體1 1之軌槽1 3中，請 搭配參閱第4圖’於本實施例中’該滑座2 1内部係設有 一螺接件2 2 ’而於該滑座2 1之頂面係設有複數個螺孔 2 3，且該滑座2 1於其側面之四端處係分別徑向穿設有 一穿孔2 4 ’而該各穿孔2 4係分別供一外徑略小於該穿 孔2 4孔徑之輪軸2 5穿設，且於該各輪軸2 5露出於該 穿孔2 4之兩端上則分別接設有一輪體2 6，並於呈上下 相對設置之二輪軸2 5間係分別設有二彈抵件2 7，且該 二彈抵件2 7係分別彈抵於各輪軸2 5鄰近其輪體2 Θ之 兩端位置處’並藉該二彈抵件2 7之彈抵而使呈上下相對 設置之各輪體2 6係可分別確實滑接於該軌槽1 3之頂面 及底面上，另於該滑座2 1設有該等輪體2 6之兩側面上 係分別設有二呈上下設置之刮板2 8，且該各刮板2 8係 分別设於呈左右相對之輪體2 6周邊，並於該各括板2 8 兩端係分別朝其所相對之軌槽1 3周面方向延伸形成有一 抵接段2 8 1，且位於該滑座2 1同一側面上的二刮板2 8之間係分別設有一彈性件29，並藉該彈性件2g之彈 抵而令該二刮板2 8之抵接段2 8 1係分別抵接於該各輪 體2 6行進路徑之軌槽1 3頂面及底面上。 該拉線頭31，其係朝下延伸接設有一應變計支架3 201138900 2 ’而該拉線頭3 1係以其應變計支架3 2底端鎖接於該 滑座2 1頂面之定位孔2 4中，並使該拉線頭3 1係外露 於該殼體11之頂面上。 該傳動機構41，係與該滑座21相接，而可驅動該 滑座2 1沿該軌槽1 3滑移，並同步帶動該滑座2 1上之 拉線頭3 1進行一直線移動，於本實施例中，該傳動機構 4 1係設置於該殼體1 1之執槽1 3中，而該傳動機構4 1係由一馬達4 2以及一可受該馬達4 2驅動運轉之導螺 • 桿4 3所組成’且該導螺桿4 3係與該滑座2 1内部之螺 接件2 2相互螺接’以使該馬達4 2驅動該導螺桿4 3運 轉時，該滑座2 1係可受該導螺桿4 3傳動與該軌槽1 3 之限制而沿該軌槽1 3進行預定行程之直線移動。 接著請繼續搭配參閱第5圖，本發明於實際使用時， 由於該滑座2 1上之各輪體2 6係藉其輪轴2 5分別受該 彈抵件之彈抵而可確實滑接於該該軌槽13之頂面及底面 上，因此當該傳動機構4 1驅動該滑座2 1沿該軌槽1 3 • 滑移時，即可使該滑座2 1進行相當順暢之直線移動，且 本發明係於呈左右相對之輪體2 6周邊更設有該刮板2 8，因此當該滑座2 1於受該傳動機構4 1驅動而進行直 線移動時，該各刮板2 8之抵接段2 8 1更可先行對該各 輪體2 6行進路徑上之軌槽頂面及底面進行一刮除灰塵之 動作，而更可確保該滑座2 1於沿該軌槽1 3滑移時之滑 移順暢性。 而位於該執槽1 3下方位置處之容置空間1 4係可供 201138900 設置有驅動拉線裝置之相關電路元件，另於該殼體丄工相 對该滑座2 1預定滑移行程之兩端點處係分別設有一磁簧 開關5 1，而於該滑座2 1之預定位置處則設有二可分別 對應啟動該二磁簧開關5 1之控制單元（圖中未示），且於 啟動5玄磁簧開關5 1時係可傳遞一反向訊號至該傳動機構 4 1上，而使該滑座2 1係得於預定行程之兩端點間進行 往復之直線移動。 另如第6圖所示，其係為本發明之第二實施例，而其 與上述第一實施例之差異係在於，該傳動機構4丄係由二 齒輪4 4以及圈繞於該二齒輪4 4上之鏈條4 5所組成， 且該滑座2 1係與該鏈條4 5相接，並藉一馬達（圖中未 示）驅動其中一齒輪4 4運轉，即可帶動該鏈條4 5拉動 該滑座2 1沿該導軌1 3進行一直線移動，並由此可知， 本發明並不侷限於傳動機構41之種類，因此舉凡能驅動 該滑座2 1沿該導軌1 3進行直線移動之傳動方式，應皆 為本發明之等效實施例。 而經由上述結構所組成之本發明，係可具有以下優點： 1本發明之破體1 1係以紹擠型方式一體製成内部 周面形成有呈直線方向延伸之軌槽丄3結構，因 此係具有加工容易且製造成本低廉之優點。 2.本發明之滑座21由於係具有可滑接於該殼體工 1執槽1 3周面上之輪體2 6，且該各輪體2 6 並藉彈抵件2 7之彈抵而可確實滑接於該軌槽丄 3之頂面及底面上，因此即使該執槽丄3於製造 201138900 上有些許誤差，仍可藉由該彈抵件2 7之彈抵作 用，而使該滑座2 1之輪體2 6仍得確實滑接於 該軌槽1 3之頂面及底面上，並藉此即可確保該 滑座2 1之滑移順暢性。 3·本發明之殼體11係以鋁擠型方式一體製成内部 周面形成有呈直線方向延伸之軌槽1 3結構，而 可供該滑座2 1滑設於其中，因此不須於該滑座 2 1兩側上穿設呈平行設置之導執結構，並藉此 • 即可有效降低拉線裝置於組成後之整體體積。 4 ·本發明之滑座2 1由於係具有可滑接於該殼體1 1軌槽1 3周面上之輪體2 6，且該各輪體2 6 並藉彈抵件2 7之彈抵而可確實滑接於該軌槽1 3中，並藉該等彈抵件2 7之設置而可有效吸收 該滑座2 1於移動時與導螺桿4 3之間產生之歪 斜偏差現象，因此本發明之導螺桿4 3係具有不 易變形彎曲而具有較長使用壽命之優點。 • 5 ·本發明於組裝上係僅須將該滑座2 1直接塞設於 該執槽1 3中，即可藉由該彈抵件2 7之彈抵作 用，而令其輪體2 6自動彈抵於該軌槽1 3之頂 面及底面上，而不須另外之校正作業，因此其組 裝精密度要求不高，而具有組裝容易之特色。 6 ·本發明係於呈左右相對之輪體2 6周邊更設有該 刮板2 8，因此當該滑座2 1於受該傳動機構4 1驅動而進行直線移動時，該各刮板2 8之抵接 9 201138900 段2 8 1更可先行對該各輪體2 6行進路徑上之 軌槽頂面及底面進行一刮除灰塵之動作，而更可 確保該滑座21於沿該執槽13滑移時之滑移順 暢性。 惟，以上所述實施例之揭示係用以說明本發明，並非 用以限制本發明，故舉凡數值之變更或等效元件之置換仍 應隸屬本發明之範疇。 綜上所述，本發明再與同類產品相較之下，係已具有 相當的進步性及實用性，且經以上詳細說明後，係可使熟 知本項技藝者明暸本發明的確可達成前述目的，實已符合 專利法之規定，故本案發明人爰依法提出專利申請。 201138900 【圖式簡單說明】 意圖 弟1圖係本發明之立體分解示意圖 第2圖係本發明組裝後之立體外觀示意圖 第3圖係本發明組裝後之剖面示意圖 第4圖係本發明滑座之細部分解示意圖 第5圖係本發明之使用狀態示意圖 第6圖係本發明第二實施例之結構示意圖 第7圖係習知之球拍穿線機拉線裝置之結構示 【主要元件符號說明】 (習用部分） 滑座7 1 拉線頭7 2 導軌7 3 齒輪7 4 鏈條7 5 驅動馬達7 6 (本發明部分） 殼體1 1 長溝槽1 2 軌槽1 3 容置空間1 4 嵌槽1 5 滑蓋1 6 滑座2 1 螺接件2 2 螺孔2 3 穿孔2 4 輪軸2 5 輪體2 6 彈抵件2 7 刮板2 8 抵接段2 8 1 彈性件2 9 11 201138900 拉線頭3 1 傳動機構4 1 導螺桿4 3 鏈條4 5 應變計支架3 2 馬達4 2 齒輪4 4 磁簧開關5 1201138900 VI. Description of the Invention: [Technology Leading to the Invention] The present invention relates to the structure of a racket stringing machine, and more particularly to a wire drawing device for a racket stringing machine. [Prior Art] As shown in Fig. 7, the drawing device of the conventional racquet stringing machine is mainly provided with a rifling head 7 2 on the top surface of a sliding seat 71, and the sliding seat 7 1 is It is disposed on two parallel guide rails 73, and the slider 71 is connected to a chain 75 that is disposed on the two gears 74, and drives one of the gears 7 by a driving motor 76. 4, the chain 7 5 can be pulled to move the carriage 7 1 along the guide 7 3 in a straight line. However, the wire drawing device of the conventional racquet stringing machine is slidably moved on the guide rails 7 by the sliding block 71 to achieve the purpose of pulling the wire, and to ensure that the sliding seat 71 is slipped. Smoothness, so the precision of the slider 7 and the guide rails 7 3 is extremely high, and since there must be a certain cable distance when pulling the wire, the guides 7 3 have a considerable length. Moreover, the more difficult it is to control the precision, and the manufacturing cost is relatively increased; in addition, the wire drawing device is provided with a transmission structure for pulling the slider 71. The structure of the guide rails 7 3 on both sides of the slider 7 1 is more likely to cause a larger volume of the cable harness after the composition thereof. In order to reduce the manufacturing cost, for example, the US Patent No. 462〇7〇g 201138900 5733212, No. 6227990 adopts a screw to directly drive the sliding seat assembly with the cable head structure to reduce the manufacturing cost, but the above patents are in the screw. When the slider is moved, the tension of the cable will cause the skew between the screw and the screw when the slider moves, which causes the screw to be easily deformed and bent, and the wear is too fast. Therefore, how to improve the above problem is the primary subject of the present invention. Therefore, the inventor of the present invention finally has the invention after continuous hard thinking and trial work. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a wire drawing device for a racquet stringing machine which has a low manufacturing cost and ensures smooth operation when performing a wire drawing operation. For the purpose of the foregoing, the present invention provides a wire drawing device for a racquet stringing machine, comprising: a casing having a hollow shape and defining a rail groove extending in a linear direction on an inner circumferential surface thereof; The seat is disposed in the holding groove of the housing, and the opposite sides of the sliding seat are respectively provided with wheel bodies corresponding to sliding on the circumferential surface of the track groove; a pull wire head, which faces downward Extending a strain gauge bracket, the cable head is fixed to the sliding seat by the bottom end of the strain gauge bracket, and the cable head is exposed on the top surface of the housing; 201138900 a transmission mechanism The sliding seat is connected to drive the sliding seat along the holding slot, and synchronously drives the pulling head on the sliding seat to perform a linear movement. Wherein, the sliding seat is respectively provided with a through hole at a radial direction of the four ends of the sliding portion, and each of the punching holes is respectively provided with an axle having an outer diameter slightly smaller than the perforating aperture, and the axle is exposed at the axle A wheel body is respectively disposed on the two ends of the perforation, and two elastic members are respectively disposed between the two axles disposed opposite each other, and the two elastic members are respectively respectively abutted on the wheel axles adjacent to the wheel bodies thereof. At the two ends, the wheel systems of the two upper and lower opposite sides are slidably coupled to the top and bottom surfaces of the track groove by the elastic force of the two elastic members. The above objects and advantages of the present invention will be readily understood from the following detailed description of the embodiments of the invention. Of course, the invention may be varied on certain components or arrangements of parts, but the selected embodiments are described in detail in this specification. [Embodiment] Please refer to FIG. 1 to FIG. 4, which is a wire drawing device for a racquet stringing machine provided by the present invention, which is mainly composed of a casing 11, a sliding seat 2, and a pulling device. The wire head 3 1 and a transmission mechanism 4 1 are composed of: the casing 1 1 is integrally formed into a hollow square tube in an aluminum extrusion manner, and the top surface of the casing 11 is provided with a long groove extending in a straight line direction. a slot 1 2, and defining a slot 13 extending in the same direction as the long slot 12 at four corners of the inner circumference of the housing 11, and opposing the housing in the housing 1 1 201138900 An accommodating space 14 is formed in the lower portion of the slot 13 to extend into the slot 13 , and a slot 15 is formed on the long axial side of the slot 1 2 . And a sliding cover 16 which is slidable along the recessed groove 15 is disposed in the recessed groove 15. The sliding seat 2 1 is disposed in the rail slot 13 of the housing 1 1 . Please refer to FIG. 4 'in the present embodiment, 'the inside of the sliding seat 2 1 is provided with a screw member 2 2 ' A plurality of screw holes 2 3 are disposed on the top surface of the slider 2 1 , and the sliders 2 1 are respectively radially provided with a through hole 24 4 ' at the four ends of the side surfaces thereof, and the through holes 2 4 The wheel axles 25 having an outer diameter slightly smaller than the diameter of the perforations 24 are respectively disposed, and the wheel axles 25 are respectively exposed on the two ends of the perforations 24, and a wheel body 2 6 is respectively connected. The two axles 25 are respectively provided with two elastic members 2, respectively, and the two elastic members 2 7 are respectively respectively biased to the positions of the ends of the respective wheel axles 2 5 adjacent to the wheel bodies 2 ' and By means of the elastic force of the two elastic members 27, the wheel bodies 26 which are arranged in the upper and lower directions can be slidably respectively attached to the top surface and the bottom surface of the rail groove 13 and the slider 2 1 is provided. The two sides of the wheel body 26 are respectively provided with two upper and lower squeegees 2 8 , and the squeegees 28 are respectively disposed at the periphery of the wheel body 26 which is opposite to each other, and Bracket 2 8 ends at each end An abutting portion 281 is formed in the circumferential direction of the rail groove 1 3, and an elastic member 29 is respectively disposed between the two squeegees 28 on the same side of the sliding seat 2 1 , and the elastic member 2g is respectively The abutting portion 281 of the two squeegees 2 8 abuts against the top surface and the bottom surface of the rail groove 13 of the traveling path of each wheel body 26. The cable head 31 is extended downwardly and has a strain gauge bracket 3 201138900 2 ', and the cable head 3 1 is locked with the bottom end of the strain gauge bracket 3 2 to the top surface of the sliding seat 2 1 . In the hole 24, the wire head 31 is exposed on the top surface of the casing 11. The transmission mechanism 41 is connected to the sliding seat 21, and can drive the sliding block 2 1 to slide along the rail slot 13 and synchronously drive the wire pulling head 31 on the sliding block 2 1 to move in a straight line. In the present embodiment, the transmission mechanism 4 1 is disposed in the slot 13 of the housing 1 1 , and the transmission mechanism 4 1 is guided by a motor 42 and a motor that can be driven by the motor 42 The screw rod 4 3 is composed of 'and the lead screw 43 is screwed together with the screw 2 2 inside the slider 2 1 ' to enable the motor 42 to drive the lead screw 4 3 to operate. The 2 1 system is linearly movable along the rail groove 13 by a predetermined stroke of the lead screw 43 and the rail groove 13 . Then, please continue to refer to FIG. 5. When the present invention is used in practice, since each wheel body 26 on the carriage 2 is elastically resisted by the elastic member of the pulley 2, it can be surely slid. On the top surface and the bottom surface of the rail groove 13, when the transmission mechanism 4 1 drives the carriage 2 1 to slide along the rail groove 13 3, the slider 2 1 can be made into a relatively straight line. Moving, and the present invention is further provided with the squeegee 2 8 around the left and right opposite wheel bodies 26, so when the sliding block 2 1 is linearly moved by the transmission mechanism 4 1 , the squeegees The abutting section 2 8 1 of the 2 8 can further perform a dust scraping action on the top surface and the bottom surface of the track groove on the traveling path of each wheel body 26, and further ensure that the sliding seat 2 1 is along the rail Slip smoothness when slot 1 3 slips. The accommodating space 14 located at the lower position of the sluice 13 is available for the 201138900 to provide the relevant circuit components of the driving cable device, and the two housings are opposite to the predetermined sliding stroke of the slider 2 1 . A reed switch 5 1 is respectively disposed at the end point, and a control unit (not shown) corresponding to the activation of the two reed switch 51 is respectively disposed at a predetermined position of the sliding seat 2 1 , and When the 5 reed switch 5 1 is activated, a reverse signal can be transmitted to the transmission mechanism 4 1 , so that the slider 2 1 is linearly moved between the two ends of the predetermined stroke. Further, as shown in FIG. 6, it is a second embodiment of the present invention, and the difference from the first embodiment is that the transmission mechanism 4 is wound by the two gears 4 4 and the two gears. 4 4 is composed of a chain 4 5 , and the slider 2 1 is connected to the chain 4 5 , and drives a gear 4 4 by a motor (not shown) to drive the chain 4 5 Pulling the carriage 2 1 to move along the guide rail 13 in a straight line, and thus it can be seen that the present invention is not limited to the type of the transmission mechanism 41, so that the carriage 2 1 can be driven to move linearly along the guide rail 13 The transmission mode should be an equivalent embodiment of the invention. The present invention, which is composed of the above-described structure, has the following advantages: 1. The broken body 1 1 of the present invention is integrally formed in a squeeze-type manner, and the inner peripheral surface is formed with a rail groove 丄 3 structure extending in a linear direction. It has the advantages of easy processing and low manufacturing cost. 2. The sliding seat 21 of the present invention has a wheel body 2 6 slidably attached to the circumferential surface of the casing 1 of the casing 1 and the wheel body 2 6 is biased by the elastic member 27 It can be surely slid on the top surface and the bottom surface of the rail groove 3, so even if the actuator 3 has a slight error in the manufacture of 201138900, the spring can be resisted by the elastic member 27 The wheel body 26 of the carriage 2 1 still has to be slidably attached to the top surface and the bottom surface of the rail groove 13 , and thereby the smoothness of the sliding seat 2 1 can be ensured. 3. The casing 11 of the present invention is integrally formed in an aluminum extrusion manner, and the inner circumferential surface is formed with a rail groove 13 structure extending in a straight line direction, and the sliding seat 2 1 is slidably disposed therein, so that it is not required A guiding structure arranged in parallel is arranged on both sides of the sliding seat 2 1 , and thereby the overall volume of the cable pulling device after the composition can be effectively reduced. 4) The slide seat 2 1 of the present invention has a wheel body 2 6 which is slidably attached to the circumferential surface of the rail groove 13 of the casing 1 1 and the wheel body 2 6 is slid by the spring 2 7 In the meantime, it can be slidably connected to the rail groove 13 , and the deflection of the slider 2 1 between the moving rod and the lead screw 43 can be effectively absorbed by the arrangement of the elastic members 27 . Therefore, the lead screw 43 of the present invention has the advantage of being less susceptible to deformation and bending and having a long service life. • The invention is only required to directly insert the sliding seat 2 1 into the holding groove 13 in the assembly, and the wheel body 2 6 can be obtained by the elastic action of the elastic member 27 . It automatically bounces on the top surface and the bottom surface of the rail groove 13 without additional calibration work, so the assembly precision is not high, and the assembly is easy. The present invention is further provided with the squeegee 2 8 around the left and right opposite wheel bodies 26, so when the sliding block 2 1 is linearly moved by the driving mechanism 4 1 , the squeegees 2 8 abutting 9 201138900 segment 2 8 1 can first perform a dust scraping action on the top surface and the bottom surface of the track groove on the traveling path of each wheel body 26, and further ensure that the sliding seat 21 is along the Sliding smoothness when the groove 13 slips. The disclosure of the above-described embodiments is intended to be illustrative of the present invention and is not intended to limit the scope of the invention. In summary, the present invention has been considerably improved and practical compared with similar products, and after the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objectives. It has already complied with the provisions of the Patent Law, so the inventor of this case filed a patent application according to law. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 2 is a perspective view of the present invention after assembly. FIG. 3 is a schematic cross-sectional view of the present invention after assembly. FIG. 4 is a view of the slide of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a schematic view showing the state of use of the present invention. FIG. 6 is a schematic view showing the structure of a second embodiment of the present invention. FIG. 7 is a view showing the structure of a conventional racket stringing device of a racket [main component symbol description] (customized part) ) Slide 7 1 Pull head 7 2 Guide rail 7 3 Gear 7 4 Chain 7 5 Drive motor 7 6 (part of the invention) Housing 1 1 Long groove 1 2 Track groove 1 3 Housing space 1 4 Insert groove 1 5 Slip Cover 1 6 Slide 2 1 Screw 2 2 Screw hole 2 3 Perforation 2 4 Wheel 2 2 Wheel 2 2 Spring 2 2 Scraper 2 8 Abutment 2 8 1 Elastic 2 9 11 201138900 Pull head 3 1 Transmission 4 1 Lead screw 4 3 Chain 4 5 Strain gauge bracket 3 2 Motor 4 2 Gear 4 4 Reed switch 5 1
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