1228480 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是關於一種在半導體製造工廠或醫院等所利用 的具備沿著行走軌道可移動的台車的搬運系統。 【先前技術】 近年來，在半導體製造工廠或醫院等的設施中，作爲 搬運被搬運物所用的搬運系統，廣泛地普及著在設施的天 花板空間舖設行走軌道之同時，將裝卸被搬運物的工作站 設在各房間，裝載被搬運物的台車行走在各工作站間的行 走軌道上的系統。 習知，作爲如上述的搬運系統，眾知有表示於第5、 6圖者。表示於第5圖的搬運系統50是作成具有行走軌 道的行走軌道51，及複數工作站52a、52b、52c，及複數 台台車5 3，及台車待機所5 4的構成；在台車待機所5 4 作成未裝載有被搬運物的台車5 3待機的構成。 如第 6圖所示地，工作站5 2 a〜5 2 c是將例如工作台 5 2a作爲例子加以說明，作爲具有設於行走軌道5 i更下 方的開口部54，及在工作站52a的內部朝上下方地移動 的移動軌道部的移動軌道5 5，及在工作站5 2 a的上方朝 上下地移動的代替軌道部的代替軌道5 6的構成。移動軌 道5 5是作爲裝載台車5 3的狀態移動行走軌道5 1與開口 邰5 4之間的構成，代替軌道5 6是作爲在移動軌道5 5下 降時與行走軌道5 1連結般地移動的構成。在沒有裝卸被 -5 - 1228480 (2) 搬運物時，移動軌道5 5與行走軌道5 1連結，而代替軌道 56是配置於台車53可通過其下方的位置。 在工作站5 2 a中，在接收被搬運物時，裝載有被搬運 物的台車5 3行走在行走軌道5 1上而裝載於移動軌道5 5 上，俾使移動軌道5 5下降。與此同時地，代替軌道5 6也 下降，而停止在與行走軌道5 1連結的位置。又，移動軌 道5 5下降至開口部5 4，則可接收裝載於台車5 3的被搬 運物。又，同樣地也構成工作站52b、52c。 工作站52a是如上述地所構成之故，因而在搬運系統 5 0中，即使在工作站5 2 a進行被搬運物的裝卸時，也連 結有行走軌道5 1與代替軌道5 6之故，因而台車5 3可通 過工作站52a。由此，不會停滯在工作站52b、52c而可 搬運。 然而，在上述搬運系統50中，在工作站52a進行被 搬運的裝卸時，其他的台車53同時地搬運在工作站52a 裝卸的被搬運物的情形，則第二台台車5 3是必須待機在 工作站52a正前方的行走軌道51上，藉由此種待機的台 車53，有對於工作站52b、52c的搬運產生停滯，或無法 有效率地使用台車53的缺點問題。又，在工作站52a中 ，若發送作業的頻度較多時，則未裝載被搬運物的台車 5 3從台車待機所5 4到達工作站5 2 a爲止需費時之故，因 而藉由該呼叫時間有作業效率變差的缺點問題。 【發明內容】 -6 - 1228480 (3) 本發明是在此種背景下所創作者，其目的是在於提供 一種即使在各工作站同時地進行依複數台台車的搬運時， 或在發送作業的頻度較多時，也可有效率地使用台車的搬 連系統。 爲了解決上述課題，本發明的形態是一種搬運系統， 其特徵爲：具備行走軌道，及沿著行走軌道而可移動的複 數台台車；在上述行走軌道’設有從行走軌道被分離朝交 叉於該行走軌道的方向移動的複數移動軌道部，同時具備 連絡從上述行走軌道被移動的狀態的移動軌道部彼此間的 連絡軌道部。 依照該搬運系統，在各工作站設有複數移動軌道部， 同時具備連絡從行走軌道被移動的狀態的移動軌道部彼此 間的連絡軌道部之故，因而行走在行走軌道上而被裝載於 移動軌道部的台車，是利用移動軌道部朝交叉方向移動， 而被引導至與移動軌道部連絡的連絡軌道部。由此，在一 個工作站同時地進行依複數台台車的搬運時，不必在行走 軌道上待機台車而可在連絡軌道部待機，又可有效率地使 用台車。 又，在上述搬運系統中，上述移動軌道部從上述行走 軌道被分離而被移動時，代替上述移動軌道部備連續上述 行走軌道的代替軌道部也可以。 依照該搬運系統，移動軌道部從行走軌道被分離而移 動時，代替軌道部與行走軌道連結之故，因而經常地確保 通過工作站上的軌道。由此，即使在工作站進行被搬運物 1228480 (4) 的裝卸時，其他台車可通過工 可搬運至其他工作站◦又，即 台車，也不會影響到對於其他 業頻度較多的工作站，則在連 縮短呼叫時間並提高作業效率 又，在上述搬運系統中， 裝載一台台車的尺寸也可以。 依照該搬運系統，連絡軌 車的尺寸之故，因而在工作站 間，同時也確保其他台車的行 的使用效率。 【實施方式】 以下，參照圖式說明本發 第1圖是表示有效率地搬 體等的被搬運物的搬運裝置（ 部剖視立體圖；第2圖至第4 的移動機構的前視圖及側視圖 在表示於本實施形態的搬 地能通過醫療設施的診療室、 舖設有行走軌道，而在各房間 的台車的工作站。控制各台車 爲自動地控制，在進行發送作 物的空台車的呼叫控制，或是 作站上之故，因而不會停滯 使在連絡軌道部事先待機空 工作站的搬運，而在發送作 絡軌道部待機空台車，就可 〇 上述連絡軌道部至少具有可 道部至少具有可裝載一台台 至少具有一台台車待機的空 走軌道。由此，可提高台車 明的實施形態。 運醫療設施的各種文件或檢 搬運系統）的主要部分的局 圖是表示台車的移動軌道部 〇 運裝置中，如上述的第5圖 治療室、手術室等各房間地 設有停止行走在行走軌道上 是藉由未圖示的控制裝置或 業時進行呼叫未裝載被搬運 將裝被搬運物的台車行走至 -8- 1228480 (5) 目的工作站的搬運控制。 在該搬運裝置中，如第1圖所示地，在工作站1連結 有台車2所行走的行走軌道3，設有從行走軌道3被分離 的兩個移動軌道部的移動軌道4a、4b。亦即，行走軌道3 是在工作站1中被分斷成行走軌道3a、3b、3c，而在行 走軌道3 a、3 b間是成爲利用移動軌道4 a或是代替軌道 9 a所連絡，在行走軌道3 b、3 c間是成爲利用移動軌道4 b 或是代替軌道9b所連絡。 移動軌道4 a、4 b是作成比所裝載的台車2更長的尺 寸，構成利用下述的昇降機構從行走軌道3分離而可朝下 方移動，又構成當移動軌道4a、4b下降時，代替軌道9a 、9b能結合於行走軌道3。在工作站1設有昇降移動軌道 4a、4b的昇降通路5a、5b，昇降通路5a、5b的下方是設 有藉由連絡通路6相連通，且能連絡達到昇降通路5a、 5b的下方的移動軌道4a、4b間的移動軌道部的連絡軌道 7。連絡軌道7的長度尺寸是作成可配置兩台台車2在互 相之間隔著所定間隙的長度。 又，各通路是形成在壁體內部；昇降通路5a、5b是 形成可通過裝載台車2的移動軌道4a、4b，而連絡通路6 是形成可通過行走連絡軌道7的台車2。又，在移動軌道 4b的下方壁體設有開口於工作站1內的開口部8。 使用第2圖至第4圖說明移動軌道4a及代替軌道9a 的昇降機構。 移動軌道4a與代替軌道9a及移動軌道4a與代替軌 1228480 (6) 道9 b，是使用同樣構成的昇降機構。在工作站1垂直方 向地設有旋轉自如地支持的滾珠螺旋2 0，而滾珠螺旋2 0 是成爲利用驅動裝置2 1被旋轉驅動的構成。 如第3圖所示地，在移動軌道4 a的側面固定有主移 動體2 2，而在主移動體2 2配置有母螺旋構件2 3。母螺旋 構件2 3是螺裝於滾珠螺旋2 0，當滾珠螺旋2 0旋轉時， 成爲移動軌道4a上下移動的構成。在主移動體22上面， 豎設有支持構件2 5，在支持構件2 5上配置有副移動體2 6 ，而在副移動體2 6側面作成固定有代替軌道9 a的構成。 在副移動體2 6，形成有比滾珠螺旋2 0的外徑更大徑 的貫通孔，而滾珠螺旋2 0相對地貫通位於該貫通孔。代 替軌道9a是可自由地上下移動對於滾珠螺旋20，通常是 成爲載置於支持構件25上的狀態。在代替軌道9a形成有 朝左右方向突出的突起部27，能與突起構件27扣合地在 行走軌道3的端部形成有扣合部2 8。 在該構成中，朝下方移動裝載台車2的移動軌道4a 時，利用驅動裝置2 1來旋轉滾珠螺旋20，由此與主移動 體22 —起使移動軌道4a下降。這時候，如第4圖所示地 利用扣合有突起構件27與扣合構件28，連結有代替軌道 9a與行走軌道3，作成台車2可通過工作台1上的狀態。 依狀態，移動軌道4 a與行走軌道3作成直線狀，能行走 台車2的狀態。 使用第1圖說明如上述的構成的搬運裝置的動作。 在工作站1收到被搬運物時，裝載被搬運物的台車2 -10- 1228480 (7) ，是行走在行走軌道3上而到達工作站1並停止在移動軌 道4a上。裝載有台車2的移動軌道4a，是下降昇降通路 5 a內而停止在與連絡軌道7結合的位置。這時候，移動 軌道4b是位於昇降通路5a的下方之故，因而台車2是通 過連絡軌道7上並行走至移動軌道4b，而停止在正對於 開口部8的位置。又，經開口部8被搬運從台車2被取出 〇 與此同時地，下一台車2將被搬運物搬運至工作站1 時，則裝載下一台車2的移動軌道4a下降至與連絡軌道 7的位置，下一台車2是停止在移動軌道2b正前方的連 絡軌道7。同樣地，第三台台車2搬運快搬運物到達時， 也在連絡軌道7停止，待機到可行走至前方爲止。又，在 移動軌道4b上被取出被搬運物的台車2，是利用移動軌 道4b被上昇，當結合移動軌道4b與行走軌道3時，移動 至行走軌道3上。又，移動軌道4b是一直到與連絡軌道 7結合爲止仍下降，而待機的下一台車2是移動至移動軌 道4b上。如此地，台車2從行走軌道3依次移動至開口 部8，使得被搬運物被取出。 如此地，當先前的台車2進行裝卸之期間，下一台車 2及第三台台車2是在連絡軌道7上待機，這時候，行走 軌道3是利用代替軌道9a、9b被結合之故，因而可將台 車2通過工作台1上面。因此，可有效率地使用台車2。 又’在工作站1中，將被搬運物發送至其他工作站時 ，則操作控制裝置俾呼叫空台車2。從表示於第5圖的台 -11 - (8) 1228480 車待機所5 4行走在行走軌道3上的台車2是到達工作站 1，而停止在移動軌道4 a上，通過昇降通路5 a及連絡通 路6，停止在正對於開口部8的位置。這時候’若知道在 工作站1有頻繁地進行發送作業，則利用控制裝置將複數 台的空台車2事先待機在連絡軌道7上，由此，縮短空台 車2從台車待機所5 4行走來到的呼叫時間，當進行呼叫 空台車2的操作，則使得待機在連絡軌道7上的空台車2 移動至開口部8。 又，在空台車2待機在工作站1的連絡軌道7上的期 間，其他台車2將被搬運物搬運至工作站1時，通過昇降 通路5b，則裝載被搬運物的台車2不會停滯地移動至開 口部8。又，在連絡軌道7上未待機空台車2時，也僅使 用移動軌道4b來昇台車2，也可使用與習知相同的使用 方法。 如此地，爲了縮短呼叫時間待機空台車2的期間，行 走軌道3是利用代替軌道9a、9b被結合之故，因而可使 得其他台車2通過工作站1上面，並不會妨礙其他台車2 的行走。因此，可提高台車2的作業效率。 又，在本實施形態中，使用行走軌道上面的台車2進 行說明，惟將本發明適用在懸架式台車也可以。作成在連 絡軌道7上可待機兩台台車2的構成，惟可待機的台車2 的台數是兩台以上也可以，視需要可適當地變更並設定連 絡軌道7的長度。又，適當地設定開口部8的上下方向的 位置，而在作業容易位置可進行裝卸被搬運物。又，移動 -12- 1228480 (9) 軌道4 a及代替軌道9 a的昇降機構，是使用滾珠螺旋所用 的旋轉驅動，惟代替滾珠螺旋，也可使用皮帶或鏈條機構 【圖式簡單說明】 第1圖是表示本發明的一實施形態的搬運系統的主要 、 部份的工作站的局部剖視立體圖。 第2圖是表示工作站的移動軌道部的昇降機構的前視 圖。 · 第3圖是表示移動軌道部的昇降機構的側視圖。 第4圖是表示下降移動軌道部的狀態的昇降機構的前 視圖。 第5圖是表示習知的搬運系統的槪略的說明圖。 第6圖是表示習知的搬運系統的工作站的立體圖。 記號之說明 1 :工作站 _ 2 :台車 3 :行走軌道 4a、4b :移動軌道部（B ) 7 :連絡軌道部（連絡軌道） 8 :開D部 9a、9b :代替軌道部（代替軌道） -13-1228480 (1) 发明 Description of the invention [Technical field to which the invention belongs] The present invention relates to a conveyance system provided in a semiconductor manufacturing plant, a hospital, or the like, and provided with a trolley that can move along a traveling track. [Prior Art] In recent years, in semiconductor manufacturing plants, hospitals, and other facilities, as a conveyance system for conveying objects, a work station for loading and unloading objects has been widely spread while laying a walking track on the ceiling space of the facility. A system that is installed in each room and that the trolley carrying the object to be transported travels on the traveling track between the workstations. It is known that as the above-mentioned conveying system, it is well-known as shown in Figs. The conveying system 50 shown in FIG. 5 is configured to have a traveling rail 51 having a traveling rail, a plurality of workstations 52a, 52b, and 52c, a plurality of trolleys 5 3, and a trolley standby station 5 4; A structure is provided in which the trolleys 5 3 on which objects to be transported are not placed are on standby. As shown in FIG. 6, the workstations 5 2 a to 5 2 c are described by taking, for example, the table 5 2a as an example, as having an opening portion 54 provided below the walking rail 5 i, and facing inside the workstation 52a. The moving track 55 of the moving track portion moving up and down, and the substitute track 56 of the replacing track portion moving up and down above the workstation 5 2 a are configured. The moving track 5 5 is configured to move between the traveling track 51 and the opening 邰 5 4 as the loading trolley 5 3, and the replacement track 5 6 moves as if it is connected to the traveling track 5 1 when the moving track 5 5 descends. Make up. (2) When there is no loading or unloading of the objects-5-1228480 (2), the moving rail 55 is connected to the walking rail 51, and the replacement rail 56 is disposed below the trolley 53. At the work station 5 2 a, when receiving the object to be transported, the trolley 5 3 loaded with the object to be transported travels on the traveling rail 51 and is loaded on the moving rail 5 5 to lower the moving rail 55. At the same time, the substitute track 5 6 also descends and stops at a position connected to the running track 51. In addition, when the moving rail 55 is lowered to the opening portion 54, it is possible to receive the object to be carried loaded on the trolley 53. The workstations 52b and 52c are also configured in the same manner. The work station 52a is configured as described above. Therefore, in the transportation system 50, even when the work station 5 2a performs loading and unloading of the object to be carried, the walking rail 51 and the substitute rail 56 are connected, so the trolley 5 3 is accessible through workstation 52a. This makes it possible to carry without stopping at the workstations 52b and 52c. However, in the above-mentioned conveying system 50, when the work station 52a is being loaded and unloaded, while other carts 53 are simultaneously moving the objects being loaded and unloaded at the work station 52a, the second cart 53 must be on standby at the work station 52a. On the running track 51 directly in front, such a standby trolley 53 has the disadvantages that the transportation of the workstations 52b and 52c is stalled or the trolley 53 cannot be used efficiently. In the workstation 52a, if the frequency of sending operations is high, it takes time for the trolley 5 3 which is not loaded with the object to be transported from the trolley stand 5 4 to the workstation 5 2 a. Disadvantages of poor working efficiency. [Summary of the Invention] -6-1228480 (3) The present invention was created under such a background, and the object of the present invention is to provide a frequency of sending jobs even when each workstation simultaneously carries a plurality of carts, or when sending jobs. In many cases, a trolley transfer system can be used efficiently. In order to solve the above-mentioned problem, the aspect of the present invention is a conveying system including a walking rail and a plurality of trolleys movable along the walking rail; and the above-mentioned walking rail is provided with a separation from the walking rail toward an intersection with The plurality of moving rail portions that move in the direction of the walking rail also include communication rail portions that connect the moving rail portions in a state where the moving rails are moved from the walking rails. According to this conveying system, each work station is provided with a plurality of moving rail sections, and also has a connecting rail section that connects the moving rail sections in a state where they are moved from the walking rails. Therefore, the walking rails are loaded on the moving rails. The trolley of the vehicle is moved to the crossing direction by the moving rail portion, and is guided to the linked rail portion that is in contact with the moving rail portion. Therefore, when a plurality of trolleys are transported simultaneously at one workstation, there is no need to wait for the trolleys on the running track, and it is possible to wait in the linked track section, and the trolleys can be used efficiently. Further, in the conveying system, when the moving rail portion is separated from the running rail and moved, a replacement rail portion may be provided instead of the moving rail portion to continue the running rail. According to this conveying system, when the moving rail portion is separated from the traveling rail and moved, the rail portion is connected to the traveling rail instead of the rail portion, so that the rail on the workstation is always ensured to pass. Therefore, even when the workstation is loading or unloading 1228480 (4), other trolleys can be transported to other workstations through the work. That is, the trolley will not affect the workstations that are frequently used in other industries. In addition to shortening the call time and improving work efficiency, the above-mentioned handling system can also be mounted on a single cart. According to this handling system, the size of the railcars is linked, so that between workstations, the efficiency of the use of other trolleys is also ensured. [Embodiment] Hereinafter, the present invention will be described with reference to the drawings. Fig. 1 is a sectional view of a conveying device (partial sectional perspective view) for efficiently conveying objects such as a body; Figs. 2 to 4 are front views and side views of a moving mechanism. The view shows that the moving site in this embodiment can pass through a medical facility's consultation room, a work station with trolleys installed in each room, and workstations with trolleys in each room. Each of the trolleys is controlled automatically, and an empty trolley call control is performed to send crops. Or it is on the station, so it will not stagnate and wait for the empty workstation to be transported in advance in the contact rail section, while waiting for the empty trolley in the transmission rail section, you can have at least the above-mentioned contact rail section. It can load one empty track with at least one trolley waiting. This can improve the implementation of the trolley. Various documents or medical handling systems for medical facilities) The main part of the map shows the trolley's moving track In the transportation device, as shown in Fig. 5 above, each of the rooms such as the treatment room and the operating room is provided with a stop on the walking track. Call control apparatus or sector is not loaded is transported to the apparatus to be conveyed to the carriage traveling -8-1228480 transfer control (5) The purpose of the workstation. In this conveying device, as shown in Fig. 1, a traveling rail 3 on which the trolley 2 travels is connected to the work station 1, and two traveling rail portions separated from the traveling rail 3 are provided with the traveling rails 4a and 4b. That is, the walking rail 3 is divided into walking rails 3a, 3b, and 3c in the work station 1, and the walking rails 3a and 3b are connected by using the moving rail 4a or instead of the rail 9a. The walking rails 3 b and 3 c are connected by using the moving rail 4 b or instead of the rail 9 b. The moving rails 4 a and 4 b are made longer than the loaded trolley 2. They are separated from the traveling rail 3 by the following lifting mechanism and can be moved downward. When the moving rails 4 a and 4 b are lowered, they are replaced. The tracks 9a, 9b can be combined with the running track 3. The work station 1 is provided with lifting paths 5a and 5b for lifting and lowering rails 4a and 4b. Below the lifting paths 5a and 5b, there are moving rails connected through the communication path 6 and capable of reaching the lower sides of the lifting paths 5a and 5b. The contact rail 7 of the moving rail portion between 4a and 4b. The length of the connecting track 7 is such that two trolleys 2 can be arranged with a predetermined gap therebetween. Each of the passages is formed inside the wall body; the elevating passages 5a and 5b form moving rails 4a and 4b capable of passing the loading trolley 2, and the communication passage 6 is a trolley 2 forming a traveling connecting rail 7. Further, an opening portion 8 opened in the workstation 1 is provided on the lower wall of the moving rail 4b. The moving rail 4a and the lifting mechanism instead of the rail 9a will be described with reference to Figs. 2 to 4. The moving rail 4a and the replacement rail 9a, and the moving rail 4a and the replacement rail 1228480 (6) The rail 9b use the same lifting mechanism. A ball screw 20 that is rotatably supported is provided in the workstation 1 in a vertical direction, and the ball screw 20 is configured to be driven by the drive device 21 to be rotated. As shown in Fig. 3, a main moving body 22 is fixed to the side of the moving rail 4a, and a female spiral member 23 is arranged on the main moving body 22. The female screw member 23 is screwed to the ball screw 20, and when the ball screw 20 rotates, the moving rail 4a moves up and down. On the main moving body 22, a supporting member 25 is erected, a sub-moving body 2 6 is arranged on the supporting member 25, and a configuration in which the rail 9a is fixed instead of the side of the sub-moving body 26 is formed. A through-hole having a larger diameter than the outer diameter of the ball screw 20 is formed in the sub-moving body 26, and the ball screw 20 penetrates through the through-hole relatively. The replacement rail 9a can be moved up and down freely. The ball screw 20 is usually placed on the support member 25. A projecting portion 27 protruding in the left-right direction is formed in the replacement rail 9a, and an engaging portion 28 is formed at an end of the running rail 3 so as to be capable of engaging with the projecting member 27. In this configuration, when the moving rail 4a of the loading trolley 2 is moved downward, the ball screw 20 is rotated by the driving device 21, thereby lowering the moving rail 4a together with the main moving body 22. At this time, as shown in Fig. 4, the projecting member 27 and the engaging member 28 are fastened, and the replacement rail 9a and the traveling rail 3 are connected, so that the trolley 2 can pass through the table 1. According to the state, the moving track 4a and the running track 3 are linearly formed, so that the trolley 2 can be moved. The operation of the conveying device configured as described above will be described using FIG. 1. When the station 1 receives the object to be transported, the trolley 2 -10- 1228480 (7) carrying the object to be transported travels on the walking rail 3 to reach the station 1 and stops on the moving rail 4a. The moving rail 4a on which the trolley 2 is mounted is lowered in the ascending / descending path 5a and stopped at the position connected to the contact rail 7. At this time, since the moving rail 4b is located below the elevating path 5a, the bogie 2 passes on the connecting rail 7 and walks to the moving rail 4b, and stops at the position facing the opening portion 8. In addition, when being transported through the opening 8 and taken out from the trolley 2 and at the same time, when the next trolley 2 transports the object to the work station 1, the moving rail 4a on which the next trolley 2 is loaded is lowered to the contact rail 7 Position, the next vehicle 2 is the link rail 7 stopped in front of the moving rail 2b. Similarly, when the third trolley 2 arrives at a fast-moving object, it also stops at the contact rail 7 and waits until it can walk forward. In addition, the trolley 2 from which the object to be carried is taken out on the moving rail 4b is raised by the moving rail 4b, and when the moving rail 4b and the walking rail 3 are combined, it moves to the walking rail 3. In addition, the moving rail 4b is lowered until it is combined with the link rail 7, and the next vehicle 2 waiting to move is moved to the moving rail 4b. In this way, the trolley 2 is sequentially moved from the traveling rail 3 to the opening portion 8 so that the object to be carried is taken out. In this way, during the loading and unloading of the previous trolley 2, the next trolley 2 and the third trolley 2 are waiting on the linked track 7. At this time, the traveling track 3 is combined instead of the tracks 9a and 9b. Therefore, The trolley 2 can be passed over the worktable 1. Therefore, the trolley 2 can be used efficiently. In addition, in the work station 1, when the object to be transported is sent to another work station, the operation control device 俾 calls the empty cart 2. From platform -11-(8) 1228480 shown in Figure 5, the car stand 5 4 The trolley 2 walking on the walking track 3 arrives at the work station 1 and stops on the moving track 4 a, passes the lifting path 5 a and contacts The passage 6 stops at a position facing the opening 8. At this time, 'if it is known that there are frequent sending operations at the workstation 1, use the control device to wait for the plurality of empty trolleys 2 on the connecting track 7 in advance, thereby shortening the empty trolleys 2 from the trolley standby station 5 4 When the operation of calling the empty trolley 2 is performed during the calling time, the empty trolley 2 waiting on the contact rail 7 is moved to the opening 8. In addition, while the empty trolley 2 is waiting on the connecting track 7 of the workstation 1, when the other trolley 2 transfers the object to the workstation 1, the trolley 2 carrying the object is moved to the station 1 without passing through the lifting path 5b. Openings 8. When the empty trolley 2 is not waiting on the contact rail 7, the trolley 2 is lifted by using only the moving rail 4b, and the same method as in the conventional method can be used. In this way, in order to shorten the waiting time of the empty trolley 2 in order to shorten the call time, the traveling track 3 is combined with the substitute tracks 9a and 9b, so that other trolleys 2 can pass through the work station 1 without hindering the movement of the other trolleys 2. Therefore, the work efficiency of the trolley 2 can be improved. In this embodiment, the trolley 2 on the running track is used for the description, but the present invention may be applied to a suspension trolley. The configuration is such that two trolleys 2 can be standby on the linked rail 7, but the number of the trolleys 2 that can be standby is two or more, and the length of the linked rail 7 can be appropriately changed and set as necessary. Furthermore, the vertical position of the opening 8 is appropriately set, and the object to be transported can be loaded and unloaded at an easy position. In addition, the -12-12480480 (9) rail 4a and the lifting mechanism instead of the rail 9a use the rotation drive of the ball screw, but instead of the ball screw, a belt or chain mechanism can also be used FIG. 1 is a partially cutaway perspective view showing a main part of a work station of a conveyance system according to an embodiment of the present invention. Fig. 2 is a front view showing a lifting mechanism of a moving rail portion of a workstation. Figure 3 is a side view showing the lifting mechanism of the moving rail portion. Fig. 4 is a front view of the lifting mechanism showing a state where the moving rail portion is lowered. Fig. 5 is an explanatory diagram showing a conventional conveying system. Fig. 6 is a perspective view showing a workstation of a conventional transport system. Explanation of symbols 1: Workstation_ 2: Trolley 3: Traveling track 4a, 4b: Moving track section (B) 7: Contact track section (contact track) 8: Open D section 9a, 9b: Replace track section (replace track)- 13-