TWI243758B

TWI243758B - Sensing apparatus

Info

Publication number: TWI243758B
Application number: TW93115040A
Authority: TW
Inventors: Hsing-Kai Hu
Original assignee: Int United Technology Co Ltd
Priority date: 2004-05-27
Filing date: 2004-05-27
Publication date: 2005-11-21
Also published as: TW200538295A

Abstract

A sensing apparatus is adapted for a printer. A carriage and a driving mechanism are installed in the printer. The driving mechanism comprises a stepping motor, a belt pulley, a driven pulley and a belt. The stepping motor drives the belt pulley to rotate and the belt pulley drives the driven pulley to rotate by the belt. The carriage is connected to the belt and moved along a path by the driving of the belt. The sensing apparatus comprises a wheel and a sensor, wherein the wheel and the belt pulley are connected to the same shaft. The wheel and the belt pulley are driven to rotate by the stepping motor at the same time. The sensor is installed in the printer for sensing the rotating distance of the wheel.

Description

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五、發明說明（1) 1¾所屬之技術領、本發明疋有關於一種感測裝置，且特別是有關於一種適用於一印表機之感測裝置，用以感測印表機之一滑架的移動距離。先前技術V. Description of the invention (1) 1¾ The technical field to which the present invention belongs relates to a sensing device, and more particularly to a sensing device suitable for a printer, for sensing one of the printer's slides. The moving distance of the rack. Prior art

^近年來’在高科技產業的帶動之下，電子相關產業無不蓬勃發展’尤其是電腦週邊設備的種類也愈來愈多樣，，輸入設備例如為鍵盤、滑鼠、掃描器以及數位相機等，而輸出没備例如為顯示器、印表機以及各種各樣的儲存衣置等均因應使用者的需求而不斷地推陳出新。以印表，為例，印表機之列印技術已經從早期的撞針式列印、單喷墨列印及單色雷射列印，進步到目前的彩色喷墨列印及彩色雷射列印等列印技術。其中用構，並上之噴噴墨列通常是移動距 3然而進馬達實際移喷墨印表機包含以安裝一墨水匣在傳動機構之帶墨印頭可間接地印作業。直接利用步進馬離’即以開放迴 ’受限於步進馬所收到之驅動訊動距離間會有4b ίί 目前常見之印表機係為噴墨印一滑架（carriage)及一傳動機構，及一噴墨印頭之滑架係接至傳動機動下，沿一路徑來移動，故在滑架受到傳動機構之帶動來移動並進^ 在低階喷墨印表機之中，習知達所接收之驅動信號來判斷滑架之路（open loop )來控制步進馬達（達之步進角的精度及機構精度，步號其所代表之轉動距離，與滑竿之微的誤差。這些誤差將導致滑尸，一 1243758 ------- 五、發明說明（2) _______ 之定位，進而改變所列印之圖像在紙張上的位圖像列印的品質不佳。 ’而¥致為了提供較佳的定位精確度至滑架，習知馬達（DC motor)搭配一編碼器（enc〇der)來力直版行準=地定位，其中編碼器包括一感應器（αΜπΊ 一編碼器轉盤（encoder disk )(或一編碼哭條帶 %e)nvod: vr.1 V^ ^ ^ (,,,, t)輸入至直奴馬達以驅動直流馬達後，直流馬上述之傳動機構，以帶動滑架沿一路徑作移動。同 =益亦感測滑架之實際移動距離，並將 =訊號（輸出脈衝），以確認滑架之正確位置轉換成輪出讯相較於以開放迴路來控制步進馬達，若以封閉迴 jclose loop)來控制直流馬達，將有助於提度’因此這樣的設計經常見於= 、編；器^必；、:由2:=”^ 2機構。由於齒輪系組本身會有組裝及製造誤採用臨说抑这册太”、馬态之精確度降低。此外，當編碼器空間、、。”、、态U呗時，編碼器條帶將會增加製作成本及安置發明内交詈ί t Ϊ t，本發明目的之一就是在提供一種感測I 夠實質上保持一致=輸出峨滑架之實際移動距離能第7頁 13600twf.ptd 1243758 五、發明說明（3) 本發明的制滑架的移動本發明的特徵中得到進為達成上感測裝置，係 (carriage) A 達、一皮帶輪帶輪作轉動，至皮帶，並受為一惰輪或一器，其中轉盤動輪同時受到表機内，用以依照本發係與皮帶輪一且轉盤與皮帶依照本發明的器，電性耦接驅動訊號及感為達本發種感測裝置，另一目的距離。其他目的是提供一種感測裝置可較為準確控和優點可解。部份或全印表機，一步的了述之一或適用於一一傳動機構，而此以從本發明所揭露的技術、一從動並經由皮到皮帶之皮帶輪。係與皮帶步進馬達感測轉盤明的較佳體成型或輪或從動較佳實施於步進馬應器之輸明之上述係適用於輪及一皮帶來帶動部目的，其内部設傳動機構包含一帶，且步從動輪轉本發明提出一種有一滑驅動沿一路徑移動此感測裝輪接於同驅動來作之轉動距實施例所者是轉盤輪之材質例所述之達與感應出訊號。置包含一 —轉軸，轉動。感離。述之感測係可與從可包含塑感測裝置器，用以進馬達動’而，其中轉盤及並與皮應器係裝置，動輪一架步進馬係驅動皮滑架係接從動輪可一感應帶輪或從配設於印其中轉盤體成型，膠。 ’更包含一控制比較步進馬達之一或全邛的目的，本發明提出另 (carriage)及動滑架沿一路徑移動印表機一傳動機構，而傳動機構係接至滑且傳動機，其内設有一滑架架，並帶^ In recent years, driven by the high-tech industry, electronics-related industries have flourished. In particular, the types of computer peripherals have become increasingly diverse. Input devices include keyboards, mice, scanners, and digital cameras. The output devices such as monitors, printers, and various storage clothes are constantly updated according to the needs of users. Taking printing as an example, the printing technology of printers has progressed from the early striker printing, single inkjet printing and monochrome laser printing to the current color inkjet printing and color laser printing. Printing technology. Among them, the inkjet column is usually moved by a distance of 3, but the feed motor is actually moved. The inkjet printer includes an ink cartridge mounted on the belt of the drive mechanism. The ink head can be used to print jobs indirectly. The direct use of stepping horses, that is, open back, is limited by the driving distance received by stepping horses. There will be 4b between the current and current printers, which are inkjet printing carriage and carriage. The transmission mechanism and the carriage of an inkjet print head are connected to the transmission motor to move along a path, so the carriage is driven by the transmission mechanism to move and enter ^ In the low-level inkjet printer, The driving signals received by Zhida are used to judge the open loop of the carriage to control the stepping motor (the accuracy of the step angle and the accuracy of the mechanism, the rotation distance represented by the step number, and the slight error with the slider. These errors will lead to sliding bodies, a 1243758 ------- V. Description of the invention (2) _______ positioning, and then change the quality of the printed image of the listed image on the paper is not good. In order to provide better positioning accuracy to the carriage, the conventional motor (DC motor) is used with an encoder to position the plate accurately. The encoder includes an inductor (αΜπΊ). An encoder disk (or an encoding cry stripe% e) nv od: vr.1 V ^ ^ ^ (,,,, t) After being input to the slave motor to drive the DC motor, the DC motor described above drives the carriage to move along a path. The same = benefit also senses The actual moving distance of the carriage and the = signal (output pulse) to confirm that the correct position of the carriage is converted into a wheel output signal. Compared to controlling the stepper motor with an open loop, if closed loop is used to control the DC The motor will help to improve 'so this design is often seen in =, editor; device ^ must;,: by 2: = "^ 2 mechanism. Because the gear train itself will be assembled and manufactured by mistake, it will be used to prevent this. The accuracy of the book is too low, and the accuracy of the horse mode is reduced. In addition, when the space of the encoder is U, the encoder strips will increase the production cost and arrange the internal communication of the invention. T Ϊ t, the invention One of the purposes is to provide a sensing I that is substantially consistent = output the actual moving distance of the E-slide. Page 7 13600twf.ptd 1243758 V. Description of the invention (3) The movement of the slide manufacturing system of the present invention In order to achieve the characteristics of the upper sensing device, the Carriage A reached A pulley rotates to the belt, and is regarded as an idler or a device, wherein the rotating wheel of the turntable is simultaneously received in the machine, and is used to connect the turntable and the belt in accordance with the present invention according to the hair system and the pulley. It is another purpose to connect the driving signal and sensor to the sensor device of the present invention. The other purpose is to provide a sensor device that can be more accurately controlled and the advantages can be solved. Partial or full printer, one step by step description Or it can be applied to a transmission mechanism, and this is a pulley driven and passed through the leather to the belt by the technology disclosed in the present invention. The above is suitable for the purpose of driving parts of wheels and a leather belt. The above mentioned system is suitable for the purpose of driving parts of wheels and a belt. Containing a belt, and step driven wheel rotation The present invention proposes a sliding drive to move the sensing mounting wheel along a path, and the rotational distance of the sensing drive wheel is connected to the same drive. The embodiment is the material of the turntable wheel, and the induction Signal. The setting includes one — a rotating shaft, which rotates. Feel away. The described sensing system can be combined with a plastic sensing device for moving the motor, and the turntable and the device are connected to the leather system, and a stepping horse is used to drive the leather carriage to connect the driven wheel. It can be formed by an induction pulley or from a turntable body arranged in the printing machine, and glued. 'It further includes the purpose of controlling one or all of the stepping motors. The present invention proposes a carriage and a moving carriage to move the printer along a path with a transmission mechanism, and the transmission mechanism is connected to the sliding and transmission machine. There is a carriage frame inside it

13600twf.ptd 第8頁構至少包含一傳動輪及一13600twf.ptd page 8 structure includes at least one driving wheel and one

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步進馬達，而此傳動輪包含一轉盤及一感應器車由’並與傳動輪同時受器係配設於印表機内，依知、本發明的較佳係可與傳動輪一體成型膠〇系义至j步進馬達所驅動。感測裝置其中轉盤係與傳動輪接於同一轉到步進馬達所驅動來作轉動。感應用以感測轉盤之轉動距離。實施例所述之感測裝置，其中轉盤 ’且轉盤及傳動輪之材質可包含塑依照控制·器，達之驅動基於輪（或傳可減少傳感測裝置動力源之封閉迴路印表機之為讓下文特舉下：本發明的較電性耦接於訊號及感應上述，本發動輪）係共動機構之零更增加上述印表機，並之設計，故列印精度。本發明之上較佳實施例丨土貝施例所述之感測裝步進馬達與感應器，用器之輸出訊號。明之感測裝置的轉盤與同接於同一轉軸，並可件數目及容置空間。此之轉盤及一感應器於以經由轉盤及感應器來搭可提高滑架之定也精確述目的、特徵和優點能，並配合所附圖式，作置，更包含一以比較步進馬印表機之皮帶一體成型，故外，本發明之步進馬達作為配步進馬達作度，進而提升更明顯易懂詳細說明如圖1繪示為本發明較佳實施例之一種感測裝置，其配設，印表機内的示意圖。請參照圖i，印表機之内設有〆滑架（carriage)20、一傳動機構3〇及一滑軸4〇，其中滑架A stepping motor, and the transmission wheel includes a turntable and an inductor, and the receiver is arranged in the printer at the same time as the transmission wheel. According to the knowledge, the preferred system of the present invention can be integrated with the transmission wheel to form a plastic. The system is driven by a stepper motor. The sensing device is connected with the transmission wheel at the same turn and driven by a stepping motor for rotation. Sensing is used to sense the turning distance of the turntable. The sensing device according to the embodiment, wherein the material of the turntable and the transmission wheel may include a plastic control device, which can drive a wheel-based (or a closed-loop printer that can reduce the power source of the sensing device). In order to make the following special mentions: The present invention is more electrically coupled to the signal and senses the above, the starting wheel) is the zero of the co-movement mechanism, and the above printer is added and designed, so the printing accuracy. The above-mentioned preferred embodiment of the present invention 丨 The sensing device described in the Tube embodiment is provided with a stepping motor and an inductor, and the output signal of the device. The turntable of Mingzhi's sensing device is connected to the same rotating shaft as the number of components and space. The turntable and a sensor can be used to improve the positioning of the carriage through the turntable and the sensor. The purpose, characteristics and advantages can be accurately described, and in accordance with the drawings, it also includes a step-by-step horse print. The belt of the watch is integrally formed, so in addition, the stepping motor of the present invention is equipped with a stepping motor to further enhance the visibility. The detailed description is shown in FIG. 1 as a sensing device of a preferred embodiment of the present invention. Its configuration, the schematic diagram inside the printer. Please refer to Fig. I, the printer is provided with a carriage 20, a transmission mechanism 30 and a slide shaft 40, among which the carriage

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五、發明說明（5) 2 0上配置有一墨水艮& 〇，於滑架2 0或墨水匡5 q上而哨"墨晶片（未繪示）係配設傳動機構30係接至滑架20，帶動滑架2 0沿一路徑p來较伸彳苒川係— 沿著路徑Ρ而移動。值心 u係用以讓滑架2 0精確地 -皮帶輪34a、-從構30例如包含-步進馬達32、攸動輪34b及一由做w „ 少接收一驅動訊號來驅動册 w 3 6 ’且步進馬達3 2係來帶動從動輪34b作轉動作轉動，並經由皮帶36 或一皮帶輪等，而滑牟总从中從動輪34b例如包含一惰輪帶36·之驅動而沿著路秤ρ 至皮帶36與滑軸40，並受皮本實施例之感計而與步進馬達32配合。本每閉迴路（cl〇Se 1〇〇ρ)設丨〗〇、-感應器120及一控=例之感測裝置包含-轉盤轉盤110上具有多個来迦^119 册认W 九柵112專，而轉盤110係可與皮 ιΓ Λ—轉軸’並可—體成型，並與皮帶輪仏同 k $到V進馬達32之驅動而作轉動，其中轉盤11G與皮帶輪34a的材質例如包含塑膠等。當轉盤11Q與皮帶輪34a一體成型且採用塑膠材質時’可大幅地降低零件成本。轉盤 110亦可與圖1之左側的從動輪34b接於同一轉軸，並可一體成型，並與彳之動輪34b同時受到皮帶36之驅動而作轉動。感應器1 2 0係例如配設於轉盤丨丨〇上，用以感測轉盤 110上之光柵112而量測出轉盤11〇之轉動距離，並產生一輸出訊號（脈衝）。此外，控制器1 3 〇係電性耦接於步進馬達3 2與感應器1 2 0 ’用以比較感應器1 2 〇所發出之輪出訊V. Description of the Invention (5) An ink is provided on the 20, and the ink is placed on the carriage 20 or the ink 5q. The ink chip (not shown) is provided with a transmission mechanism 30 and connected to the slide. The frame 20 drives the carriage 20 along a path p to move more closely toward the Sichuan Basin—moving along the path P. The value u is used to make the carriage 20 accurately-the pulley 34a, the slave structure 30, for example,-a stepper motor 32, a moving wheel 34b, and a driver w ≤ less receiving a drive signal to drive the book w 3 6 ' Moreover, the stepping motor 32 is used to drive the driven wheel 34b to rotate, and via the belt 36 or a pulley, etc., and the sliding wheel 34b is driven by an idler belt 36, for example, along the road scale ρ To the belt 36 and the sliding shaft 40, and the skin sensor of this embodiment cooperates with the stepping motor 32. Each closed loop (clOSe 1〇〇ρ) is provided with a sensor 120 and a control = The sensing device of the example includes-a turntable 110 with a plurality of Laijia ^ 119 books and Jiuzha 112, and the turntable 110 can be formed with a leather shaft and can be formed in the same manner as the belt pulley. k $ to V is driven by the input motor 32, in which the material of the turntable 11G and the pulley 34a includes, for example, plastic. When the turntable 11Q and the pulley 34a are integrally formed and made of plastic, the cost of parts can be greatly reduced. The turntable 110 also It can be connected to the same rotating shaft as the driven wheel 34b on the left side of FIG. 1, and can be integrally formed, and The moving wheel 34b is driven by the belt 36 to rotate at the same time. The sensor 120 is, for example, provided on the turntable 丨丨, and is used to sense the grating 112 on the turntable 110 and measure the rotation distance of the turntable 110. And generates an output signal (pulse). In addition, the controller 1 30 is electrically coupled to the stepping motor 32 and the sensor 1 2 0 'to compare the round signal sent by the sensor 1 2 0

1360〇twf.ptd 第10頁 1243758 五、發明說明（6) :二=進馬達32所接收之驅動訊號，用以監控二貝際位置。控制器13〇係可為一 ^月架20之合於印表機之中央控制電路。之控制電路’或可整傳動機構並不限於皮帶傳動機構，亦可* 得動機構所替換，例如了由其他傳動機構，其中傳動輪俘i:二：動輪及-步進馬達之動。同樣地，*實施例 F 進馬達所驅輪接於同-轉軸，並與傳=係與上述之傳動動上:係例如與傳動輪-體成型，且ϊϋ動來著-路經移動。勝4 ’而滑架係藉由此傳動輪而！ 7 士:斤述’本發明之感測裝置具有下列之優點. 帶_ $值I由於本發明之感測裝置的轉盤與傳動機槿讀或傳動輪共同接於同二：動機構之皮欢地減少轉盤與皮帶輪故可有隙等問盤與皮帶輪或傳動輪之間的同心度或配合：間帶輪傳動機構之皮測裝置與傳動c:的連接零件數目…降低感 (二#冓之間的裝配成本及裝配空間等。架之動力源：ί ^::感：裝置應用於以步進馬達作為滑，迴路設二本發明係經由感測裝置，並才二制步進馬達之動力輸出，故可降低步1360twf.ptd Page 10 1243758 V. Description of the Invention (6): Two = the driving signal received by the input motor 32 for monitoring the position of the second motor. The controller 13 can be a central control circuit of the printer 20 integrated with the printer 20. The control circuit ’or the integral drive mechanism is not limited to a belt drive mechanism, but can also be replaced by a moving mechanism, such as by other drive mechanisms, in which the transmission wheel cap i: 2: the moving wheel and the stepper motor are moved. Similarly, the wheel driven by the F motor in the embodiment F is connected to the same-spindle shaft, and is connected to the above-mentioned transmission: it is formed with the transmission wheel-body, for example, and it moves along the path. Win 4 ’and the carriage is made by this transmission wheel! 7th person: "The sensing device of the present invention has the following advantages. The value of _ $ I is because the turntable of the sensing device of the present invention is connected with the drive or the drive wheel. The two are: Pi Huan of the moving mechanism. To reduce the concentricity or cooperation between the disk and the pulley or the transmission wheel: there is a gap between the disk and the pulley or the transmission wheel: the number of connecting parts between the leather measuring device of the transmission mechanism of the pulley and the transmission c ... Assembly cost, assembly space, etc. Power source of the frame: ί ^ :: Sense: The device is used to use a stepping motor as a slide, and the circuit is set. The present invention is based on the sensing device, and the power of the second stepping motor. Output, so steps can be reduced

1243758 五、發明說明（7) 進馬達之機構精度不佳對於印表機之列印精度的影響，因而提高該類型之印表機的列印精度。雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍内，當可作些許之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。1243758 V. Description of the invention (7) The poor accuracy of the mechanism of the feed motor affects the printing accuracy of the printer, thus improving the printing accuracy of this type of printer. Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

13600twf.ptd 第12頁 1243758 圖式簡單說明圖1繪示為本發明較佳實施例之一種感測裝置，其配設於印表機内的示意圖。【圖式標示說明】 20 滑架 30 傳動機構 32 步進馬達 34a :皮帶輪 34b :從動輪 3 6 皮帶 40 滑轴 50 墨水匡 110 :轉盤 112 :光柵 120 :感應器 130 :控制器 P : 路徑13600twf.ptd Page 12 1243758 Brief description of the drawings Fig. 1 is a schematic diagram of a sensing device provided in a printer according to a preferred embodiment of the present invention. [Illustration of Graphical Symbols] 20 carriage 30 transmission mechanism 32 stepping motor 34a: pulley 34b: driven pulley 3 6 belt 40 slide shaft 50 ink roller 110: turntable 112: grating 120: sensor 130: controller P: path

13600twf.ptd 第13頁13600twf.ptd Page 13

Claims

1243758 六、申請專利範圍 1 . 一種感測裝置，適用於一印表機，該印表機内設有一滑架（c a r r i a g e )及一傳動機構，而該傳動機構包括一步進馬達、一皮帶輪、一從動輪及一皮帶，且該步進馬達係驅動該皮帶輪作轉動，並經由該皮帶來帶動該從動輪作轉動，而該滑架係接至該皮帶，並受到該皮帶之驅動來沿一路徑作移動，該感測裝置包括：一轉盤，與該皮帶輪及該從動輪其中之一接於同一轉轴，並與該皮帶輪及該從動輪其中之一同時受到該步進馬達所·驅動來作轉動；以及一感應器，配設於該印表機内，用以感測該轉盤之轉動距離。 2. 如申請專利範圍第1項所述之感測裝置，其中該轉盤係與該皮帶輪一體成型。 3. 如申請專利範圍第2項所述之感測裝置，其中該轉盤及該皮帶輪之材質包括塑膠。 4. 如申請專利範圍第1項所述之感測裝置，其中該轉盤係與該從動輪一體成型。 5. 如申請專利範圍第4項所述之感測裝置，其中該轉盤及該從動輪之材質包括塑膠。 6 ·如申請專利範圍第1項所述之感測裝置，更包括一控制器，電性耦接於該步進馬達與該感應器，用以比較該步進馬達之驅動訊號及該感應器之輸出訊號。 7.如申請專利範圍第1項所述之感測裝置，其中該從動輪包括一惰輪。1243758 VI. Scope of patent application 1. A sensing device suitable for a printer, the printer is provided with a carriage and a transmission mechanism, and the transmission mechanism includes a stepper motor, a pulley, a slave A moving wheel and a belt, and the stepping motor drives the belt wheel to rotate, and drives the driven wheel to rotate through the belt, and the carriage is connected to the belt and driven by the belt to operate along a path Moving, the sensing device includes: a turntable connected to the same rotating shaft as one of the pulley and the driven wheel, and simultaneously driven by the stepping motor to rotate with one of the pulley and the driven wheel ; And a sensor configured in the printer to sense the rotation distance of the turntable. 2. The sensing device according to item 1 of the scope of patent application, wherein the turntable is integrally formed with the pulley. 3. The sensing device according to item 2 of the scope of patent application, wherein the material of the turntable and the pulley includes plastic. 4. The sensing device according to item 1 of the scope of patent application, wherein the turntable is integrally formed with the driven wheel. 5. The sensing device according to item 4 of the scope of patent application, wherein the material of the turntable and the driven wheel includes plastic. 6 · The sensing device according to item 1 of the scope of patent application, further comprising a controller, which is electrically coupled to the stepping motor and the sensor to compare the driving signal of the stepping motor and the sensor Output signal. 7. The sensing device according to item 1 of the patent application scope, wherein the driven wheel comprises an idler wheel.

13600twf.ptd 第14頁 1243758 六、申請專利範圍 8 .如申請專利範圍第1項所述之感測裝置，其中該從動輪包括一皮帶輪。 9 · 一種感測裝置，適用於一印表機，該印表機内設有一滑架（carriage)及一傳動機構，而該傳動機構接至該滑架，並帶動該滑架沿厂路經移動，且該傳動機構至少包括〆傳動輪及—步進馬達，而該傳動輪係、受到驅動，該感測裝置包括： /轉盤，與該傳動輪接於同一轉轴，开 ^ 1J w w 亚與該傳動輪同時受.到該步進馬達所驅動來作轉動；以及一感應器，配設於該印表機内，用以感測該轉盤之轉動距離。 I 〇 ·如申請專利範圍第9項所述之感測裝置，其中該轉般係與該傳動輪一體成型。 II ·如申請專利範圍第9項所述之感測裝置，其中該轉盤及該傳動輪之材質包括塑膠。 1 2 ·如申請專利範圍第9項所述之感測裝置，更包括一控制器，電性耦接於該步進馬達與該感應器，用以比較該步進馬達之驅動訊號及該感應器之輸出訊號。13600twf.ptd Page 14 1243758 6. Scope of patent application 8. The sensing device as described in item 1 of the scope of patent application, wherein the driven wheel includes a pulley. 9 · A sensing device suitable for a printer, which is provided with a carriage and a transmission mechanism, and the transmission mechanism is connected to the carriage and drives the carriage to move along the factory path And the transmission mechanism includes at least a 〆 transmission wheel and a stepping motor, and the transmission wheel train is driven, the sensing device includes: / a turntable, which is connected to the same rotation shaft as the transmission wheel, and ^ 1J ww The transmission wheel is driven by the stepping motor to rotate at the same time; and a sensor is arranged in the printer to sense the rotation distance of the turntable. I 〇 The sensing device according to item 9 of the scope of patent application, wherein the rotation is generally formed integrally with the transmission wheel. II. The sensing device according to item 9 of the scope of patent application, wherein the material of the turntable and the transmission wheel includes plastic. 1 2 · The sensing device as described in item 9 of the scope of patent application, further comprising a controller, which is electrically coupled to the stepping motor and the sensor to compare the driving signal of the stepping motor and the induction Output signal.