Patent Publication Number: US-2022212382-A1

Title: Conveyance apparatus, injection molding system, and control method

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Application 62/849,697 and U.S. Provisional Application 62/849,625, which were filed on May 17, 2019. 
    
    
     FIELD 
     The present disclosure relates to an injection molding system. 
     BACKGROUND 
     Manufacturing of molded parts by an injection molding machine includes injecting a resin into a mold after clamping the mold, pressing the resin into the mold at a high pressure in order to compensate for a volume decrease due to solidification of the resin, keeping the molded part in the mold until the resin solidifies, and ejecting the molded part from the mold. 
     In the above-described molding approach, a method that uses two molds with one injection molding machine in order to enhance productivity has been proposed. For example, US 2018/0009146/Japanese patent publication No. 2018-001738/VN20160002505 are seen to discuss a system in which conveying devices  3 A and  3 B are arranged on both sides of an injection molding machine  2 . In this system, molded parts are manufactured while alternating a plurality of molds by the conveying devices  3 A and  3 B for the one injection molding machine  2 . In this system, cooling of the molds  100 A or  100 B is performed on the conveying machines  3 A or  3 B outside of the injection molding machine  2 . During cooling of one of the molds  100 A/ 100 B, each process of molded part ejection→clamping→injection/dwelling is performed by the injection molding machine  2  for the other mold  100 A/ 100 B. 
     In US 2018/0009146/Japanese patent publication No. 2018-001738/ VN20160002505, roller supporting body  620  is fixed on both sides in the X-axis direction of the fixed platen  61  and the movable platen  62 , and a plurality of rollers BR is supported by the roller supporting body  620 . With this configuration, the conveyor machines  3 A and  3 B are arranged laterally with respect to the injection molding machine  2  and convey the mold close to the injection molding machine  2 . After that, the plurality of rollers BR in the injection molding machine  2  can move the mold. However, in this configuration, when the movable platen  62  moves for opening the mold, the roller supporting body  620  and the plurality of rollers BR connected with the movable platen  62  move together. That is, when the above sequence is performed, a mold which is being cooled cannot wait on the plurality of rollers BR. Accordingly, the mold needs to wait a little apart from the injection molding machine  2 , and a time required to move the mold from a waiting position to a molding operation position is long. 
     SUMMARY 
     According to at least one aspect of the present disclosure, a method for an injection molding system including an injection molding machine that includes a supporting member for movably supporting the mold at a molding operation position and a conveyance apparatus that includes a supporting member for supporting the mold and that extends from the conveyance apparatus into the injection molding machine includes performing an injection molding process with a first mold at the molding operation position, unloading the first mold from the molding operation position, loading a second mold to the molding operation position, and opening the second mold at the molding operation position while at least a part of the first mold is on a section of the supporting member of the conveying apparatus extending into injection molding machine. 
     This and other embodiments, features, and advantages of the present disclosure will become apparent upon reading the following detailed description of exemplary embodiments of the present disclosure, when taken in conjunction with the appended drawings, and provided claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates an injection molding system according to an exemplary embodiment. 
         FIG. 2  illustrates a sectional view of an injection molding machine according to an exemplary embodiment. 
         FIG. 3  illustrates a side view of an injection molding machine. 
         FIG. 4  illustrates a flowchart of an injection molding operation. 
         FIG. 5  illustrates an operation of an injection molding machine in a first mode. 
         FIG. 6  illustrates an operation of an injection molding machine in a second mode. 
         FIG. 7  illustrates a configuration of a door portion provided on a side surface of an injection molding machine. 
         FIG. 8  illustrates a configuration of a door portion provided on a side surface of an injection molding machine. 
         FIG. 9  illustrates a configuration of a door provided on a side surface of an injection molding machine. 
         FIG. 10  illustrates an injection molding system. 
         FIG. 11  illustrates an injection molding system. 
         FIG. 12  illustrates an injection molding system. 
         FIG. 13  illustrates an injection molding system. 
         FIG. 14  illustrates a cross sectional view of a general roller bearing. 
     
    
    
     Throughout the figures, the same reference numerals and characters, unless otherwise stated, are used to denote like features, elements, components or portions of the illustrated embodiments. Moreover, while the subject disclosure will now be described in detail with reference to the figures, it is done so in connection with the illustrative exemplary embodiments. It is intended that changes and modifications can be made to the described exemplary embodiments without departing from the true scope and spirit of the subject disclosure as defined by the appended claims. 
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     The present disclosure has several embodiments and relies on patents, patent applications and other references for details known to those of the art. Therefore, when a patent, patent application, or other reference is cited or repeated herein, it should be understood that it is incorporated by reference in its entirety for all purposes as well as for the proposition that is recited. 
     With reference to the drawings, the arrow symbols X and Y in each Figure indicate horizontal directions that are orthogonal to each other, and the arrow symbol Z indicates a vertical (upright) direction with respect to the ground. 
       FIGS. 10, 11, and 3  illustrate an injection molding system discussed in US 2018/0009146/Japanese patent publication No. 2018-001738/VN20160002505 and is being provided herein for information/description purposes only.  FIG. 10  illustrates a top view of the injection molding system.  FIG. 11  illustrates a cross-sectional view of a line X 1 -X 2  in  FIG. 10 .  FIG. 3  illustrates a side view of the injection molding system when viewed in the X-axis direction. 
     The injection molding system comprises an injection molding machine  2 , a conveyor machine  3 A that conveys a mold  100 A into the injection molding machine  2 , and a conveyor machine  3 B that conveys a mold  100 B into the injection molding machine  2 . The injection molding system also includes a control apparatus (not illustrated). The injection molding system manufactures molded parts by alternating a plurality of molds, e.g.,  100 A and  100 B, via conveying machines, e.g.,  3 A and  3 B. Molds  100 A and  100 B each include a fixed mold, e.g.,  101 , and a moveable mold, e.g.,  102 , where the moveable mode  102  is opened/closed with respect to the fixed mold  101 . The molded part is molded by injecting a molding material, e.g., molten resin, into a cavity formed between the fixed mold  101  and the movable mold  102 . 
     Conveying machine  3 A moves the mold  100 A to/from a molding operation position  11  of the injection molding machine  2 . Conveying machine  3 B moves the mold  100 B to/from the molding operation position  11 . The molding operation position  11  is a region between a fixed platen  61  and a movable platen  62 . A mold  100 A/ 100 B introduced into the molding operation position  11  is clamped between the fixed platen  61  and the movable platen  62 . 
     Clamping plates  101   a  and  102   a  are respectively fixed to the fixed mold  101  and the movable mold  102 . The clamping plates  101   a  and  102   a  are used to fix the mold  100 A/ 100 B in the molding operation position  11 . 
     The conveying machine  3 A and the conveying machine  3 B are arranged adjacently on respective sides along the X-axis direction with respect to the injection molding machine  2 . The molding operation position  11  is located between the conveying machine  3 A and the conveying machine  3 B. 
     The conveying machines  3 A and  3 B respectively include a base frame  30 , a conveyance unit  31 A and  31 B, a plurality of rollers  32 , and a plurality of rollers  33 . The conveyance unit  31 A 31 B is an apparatus that moves the mold  100 A/ 100 B back and forth in the X-axis direction, and that removes and inserts the mold  100 A/ 100 B in relation to the molding operation position  11 . The base frame  30  respectively supports a table  45 , a conveyance unit  31 A/ 31 B, the plurality rollers  32 , and the plurality of rollers  33 . 
     The conveyance unit  31 A/ 31 B is an electrically driven cylinder with a motor as a driving source, and includes a rod that moves forward/backward in relation to the cylinder. The cylinder is fixed to the frame  30 , and the fixed mold  101  is fixed to the edge portion of the rod. For the conveyance unit  31  both a fluid actuator and an electric actuator can be used, where the electric actuator can provide better precision of control of the position or the speed when conveying the mold  100 A/ 100 B. The fluid actuator can be an oil hydraulic cylinder, or an air cylinder, for example. The electric actuator can, in addition to an electrically driven cylinder, be a rack-and-pinion mechanism with a motor as the driving source, a ball screw mechanism with a motor as the driving source, or the like. 
     The conveyance unit  31  is arranged independently for each of the conveying machines  3 A and  3 B. However, a common support member that supports the molds  100 A and  100 B can be used, and a single common conveyance unit  31  can be arranged for this support member. A case where the conveyance unit  31  is arranged independently for each of the conveying machines  3 A and  3 B enables handling cases where a movement strokes differ between the mold  100 A and the mold  100 B when conveying. For example, a case in which molds cannot be conveyed simultaneously since the widths of the molds (the width in the X direction) differ or the thickness of the molds (the width in the Y direction) differ. 
     The plurality of rollers  32  are a row of rollers arranged in the X-axis direction and two rows are configured separated in the Y-axis direction. The plurality of rollers  32  rotate around the axis of revolution in the Z-axis direction. The plurality of rollers  32  regulate movement in the Y-axis direction and guide movement in the X-axis direction of the molds  100 A/ 100 B and contact the side surfaces of the molds  100 A/ 100 B and support the molds  100 A/ 100 B from the side. 
     The plurality of rollers  33  are a row of rollers arranged in the X-axis direction, and two rows are configured separated in the Y-axis direction. The plurality of rollers  33  rotate around the axis of revolution in the Y-axis direction, and regulate movement in the X-axis direction of the molds  100 A/ 100 B to be smooth. The plurality of rollers  33  support the bottom surfaces of the molds  100 A/ 100 B and support the molds  100 A/ 100 B from below. 
     Supporting member  53  and supporting member  54  are provided on the table  45 . The plurality of rollers  32  and the plurality of rollers  33  are provided on both supporting member  53  and supporting member  54 . Supporting member  53  is located on the side of the injection molding system that a fixed platen  61  is located, while supporting member  54  is located on a side of the injection molding system that a movable platen  62  is located. The supporting member  53  and the supporting member  54  are approximately the same height as a he injection molding machine. 
     Both the supporting member  53  and the supporting member  54  include a slidable mechanism in the X-axis direction. A board  37  under the supporting member  53  and supporting member  54  respectively, and a long hole  38  in the X-axis direction is formed on the board  37 . Both the supporting member  53  and the supporting member  54  can slide along the hole and respectively fixed at an arbitrarily position to the table  45  by a fastening member  40 . The supporting member  54  is also slidable in the Y-axis direction. A board  35  is located between the board  37  and the table  45 . A long hole  36  in the Y-axis direction is formed on the board  35 . The supporting member  54  can slide along the long hole  36 , while the supporting member  54  is fixed at an arbitrarily position to the table  45  by a fastening member  39 . 
     A plurality of rollers BR is located on an inner surface of the fixed platen  61  and the movable platen  62  and the fixed platen  61 . The plurality of rollers BR are free to rotate around the axis of revolution in the Y-axis direction and cause movement in the X-axis direction of the molds  100 A/ 100 B to be smooth. 
     The rollers BR located at the molding operation position  1 , which is between the fixed platen  61  and the movable platen  62 , provide support for the mold  100 A/ 100 B when the mold  100 A/ 100 B is moved to the molding operation position  11 . The supporting member  53  and the supporting member  54  are approximately at the same height as the BR rollers located at the molding operation position  1 . 
     The injection molding machine includes an injection cylinder  51  that includes a heating device (not illustrated) for melting a molding material introduced from a hopper  5 . The melted molding material is injected from an injection nozzle  52  to manufacture the molded part. 
     The injection molding system also includes tie-bars  64 , a clamping apparatus (not illustrated), and a take-out robot (not illustrated) for ejecting/removing the molded part. 
     The control apparatus  4  includes a controller  41  for controlling the injection molding machine  2 , a controller  42 A for controlling the conveying machine  3 A, and a controller  42 B for controlling the conveying machine  3 B. Each of the controllers  41 ,  42 A and  42 B include, for example, a processor such as a CPU, a RAM, a ROM, a storage device such as a hard disk, interfaces connected to sensors or actuators, etc. The processor executes programs stored in the storage device. A controller is arranged for each of the injection molding machine  2 , the conveying machine  3 A, and the conveying machine  3 B, but one controller can control all three machines. The conveying machine  3 A and the conveying machine  3 B can be controlled by a single controller for more reliable and collaborative operation. 
     The controller  41  is communicably connected with the controllers  42 A and  42 B, and provides instructions related to the conveyance of the molds  100 A/ 100 B to the controllers  42 A and  42 B. The controllers  42 A and  42 B, if loading and unloading of the molds  100 A/ 100 B terminates, transmit a signal for operation completion to the controller  41 , and also transmit an emergency stop signal upon an abnormal occurrence to the controller  41 . A connecting unit  70  connects a signal line from the controller  4  to the controller  42 A and the controller  42 B respectively under the table  45 . 
       FIGS. 1 and 2  illustrate an injection molding system according to an exemplary embodiment and provides an improvement of the configuration illustrated in  FIGS. 10, 11, and 3 .  FIG. 1  illustrates a top view of the injection molding system.  FIG. 2  illustrates a cross sectional view of a line X 1 -X 2  in  FIG. 1 . The same reference numbers from  FIGS. 10-11  are repeated in  FIGS. 1-2 , and as such, detailed descriptions are omitted herein. 
     As illustrated in  FIGS. 1-2 , both the supporting member  53  and the supporting member  54  protrude from the base frame  30  into the injection molding machine  2 . This configuration results in the distance between the molding operation position  11  and a waiting position (not illustrated) to become shorter compared to the configuration illustrated in  FIGS. 10 and 11 . In the present embodiment, the waiting position is a position where the mold  100 A/ 100 B waits while the mold  100 A/ 100 B is cooled. Accordingly, by shortening the distance between the molding operation position  11  and the waiting position, the time and the energy required to move the mold  100 A/ 100 B is reduced productivity increased. 
       FIG. 4  illustrates a flowchart of an injection molding operation. 
     Before the process of the flowchart is executed, the mold  100 A is conveyed from the molding operation position  11  is cooled. The mold  100 B is conveyed to the molding operation position  11  and the injection operation for the mold  100 B completes. 
     In S 1 , releasing of the moveable platen  62  is performed and the moveable platen  62  slightly moves. This enables moving the mold  100 B. In S 2 , unloading of the mold  100 B and loading of the mold  100 A begins. This results in the mold  100 B moving from the molding operation position  11  to the supporting member  53  and supporting member  54  in the conveying machine  3 B. In parallel, the mold  100 A moves from the supporting member  53  and the supporting member  54  in the conveying machine  3 A to the molding operation position  11 . The supporting member  53  and supporting member  54  protruding into the injection molding machine  2  as illustrated in  FIGS. 1-2  shortens the distance the mold  100 A and the mold  100 B needs to travel before the process of S 3  begins. 
     In S 3 , unloading of the mold  100 B and loading of the mold  100 A completes. The unloading process of the mold  100 B is controlled such that a part of the mold  100 B is on the supporting member  53  and the supporting member  54  in the conveying machine  3 B, and at least a part of the mold  100 B is in the injection molding machine  2 . In S 4 , the mold  100 A is opened, the molded part is ejected from the mold  100 A, and the mold  100 A is closed. Based on this process, mold  100 A can be opened even though the mold  100 B is not completely outside the injection molding machine  2 . 
     In S 5 , the mold  100 A is clamped. In S 5 , injection molding with the mold  100 A is performed. Then, in S 7 , the moveable platen  62  is released and slightly moves, which makes it possible to move the mold  100 A. In S 8 , unloading of the mold  100 A and loading of the mold  100 B begins. This results in the mold  100 A moving from the molding operation position  11  to the supporting member  53  and the supporting member  54  in the conveying machine  3 A. In parallel, the mold  100 B moves from the supporting member  53  and the supporting member  54  in the conveying machine  3 B to the molding operation position  11 . The supporting member  53  and supporting member  54  protruding into the injection molding machine  2  as illustrated in  FIGS. 1-2  shortens the distance the mold  100 A and the mold  100 B needs to travel before the process of S 9  begins. 
     In S 9 , unloading of the mold  100 A and loading of the mold  100 B completes. The unloading process of the mold  100 A controlled such that a part of the mold  100 A is on the supporting member in the conveying machine  3 A, and at least a part of the mold  100 A is in the injection molding machine  2 . In S 10 , the mold  100 B is opened, the molded part is ejected from the mold  100 B, and the mold  100 B is closed. Based on this process, mold  100 B can be opened even though the mold  100 A is not completely outside the injection molding machine  2 . 
     In S 11 , the mold  100 B is clamped. In S 12 , injection molding with the mold  100 B is performed. The process then returns to S 1 , and the injection molding repeats until the number of molded parts manufactured by the injection molding system reaches a predetermined number. 
     In S 3  and S 9 , all of the unloaded mold can be located in the injection molding machine  2 . This can occur when a size of the mold is small and the mold can fit into a space next to the molding operation position  11  in the injection molding machine  2 . 
       FIGS. 5 and 6  illustrate two operation modes of the injection molding machine  2  controlled by the control apparatus  4 . 
       FIG. 5  illustrates a first operation mode. This mode is performed per the process illustrated in  FIG. 4 , where one mold is cooled on a conveying machine while injection molding is performed with another mold. The left figure illustrates a state where the mold  100 B is conveyed to the molding operation position  11  in the injection molding machine  2  by the conveying machine  3 B. The right figure illustrates a state where the mold  100 A is conveyed to the molding operation position in the injection molding machine  2  by the conveying machine  3 A. 
     More specifically, the processes in S 4 -S 7  in  FIG. 4  are illustrated in the right figure in  FIG. 5 , and processes in S 8 -S 9  are performed during the transition period from the right figure to the left figure in  FIG. 5 . The processes in S 10 -S 12  and S 1  are illustrated in the left figure in  FIG. 5 , and the processes in S 2 -S 3  are performed during the transition period from the left figure to the right figure in  FIG. 5 . 
     Door portion  80 A and door portion  80 B are located at a side of the injection molding machine  2 . When the door portion  80 A and the door portion  80 B are placed in an open state, an opening is formed at the side of the injection molding machine  2  and loading/unloading of the mold  100100 B by the conveying machine  3 A/ 3 B can occur. The door portion  80 A and the door portion  80 B include a door for enabling or restricting access to an opening  81 A and an opening  81 B respectively, as well as a door rail to guide the movement of the door. 
     The door portion  80 A/ 80 B define an inner area of the injection molding machine  2 . When the doors of the door portion  80 A and the door portion  80 B are opened, the doors are at least partially accommodated in the door cover  82 . The door cover  82  is a side plate that covers the inner components of the injection molding machine  2 . The detail configuration of the door portion  80 A and the door portion  80 B is described below with reference to  FIGS. 7-9 . 
     In both the right figure and the left figure in  FIG. 5 , both the door portion  80 A and the door portion  80 B are opened so that the mold  100 A and the mold  100 B can respectively be loaded and unloaded. In this state, the door is partially opened, and a region that is on the movable platen  62  and located at a side opposite to a side facing the fixed platen  61  is not accessible for an operator via the partially opened door. The movable platen  62  repeatedly moves in a clamping direction (+Y-axis direction) and an opening direction (−Y-axis direction) during the injection molding operation. With a partially opened door, the operator cannot contact the movable platen  62  while it moves. 
       FIG. 6  illustrates a second operation mode.  FIG. 6  illustrates the same configuration as illustrated in  FIG. 5 , except for a position of the door portion  80 A and the door portion  80 B. The left figure of  FIG. 6  illustrates a state where the mold  100 B is conveyed to the molding operation position  11  in the injection molding machine  2  by the conveying machine  3 B. The right figure of  FIG. 6  illustrates a state where the mold  100 A is conveyed to the molding operation position  11  in the injection molding machine  2  by the conveying machine  3 A. In the second mode, one cycle of the injection molding process includes the cooling process completing at the molding operation position  11  in the injection molding machine  2 . That is, the cooling process is not performed on the conveying machine  3 , so the unloading process of the mold  100 A/ 100 B after finishing the injection and dwelling process and the loading process of the mold  100 A/ 100 B before ejecting the molded part are not performed. 
     A conventional injection molding operation is performed for one mold in the injection molding machine  2 . The right figure of  FIG. 6  illustrates a state where the injection molding cycle for the mold  100 A is repeated a predetermined number of times. After finishing performing the injection molding cycle for the predetermined number of times, the state illustrated in the right figure in  FIG. 6  transitions to the state illustrated in the left figure in  FIG. 6 . The left figure of  FIG. 6  illustrates a state where the injection molding cycle for the mold  100 B is repeated a predetermined number of times as with the mold  100 A. After completing the injection molding cycle the predetermined number of times, the state illustrated in the left figure in  FIG. 6  transitions to the state illustrated in the right figure in  FIG. 6 . 
     In the state illustrated in the right figure in  FIG. 6 , in a case where the mold  100 B on the conveying machine  3 B was previously used, the mold  100 B is unloaded from the conveying machine  3 B, a new mold is loaded onto the conveying machine  3 B, and preparation for the new mold  100 B is performed by the operator while injection molding for the mold  100 A is repeated. Preparation for the new mold  100 B includes connecting an electric power cable or a hose for circulating cooling liquid for adjusting temperature with the mold  100 B. When the mold  100 B is unloaded from the conveying machine  3 B, the electric power cable and hose are removed from the mold  100 B. After preparing for the new mold  100 B, the new mold  100 B is conveyed to the molding operation position  11  in the injection molding machine  2  by the conveying machine  3 B after the injection molding operation for the mold  100 A is performed. In the state illustrated in the left figure in  FIG. 6 , the same operation is performed on the conveying machine  3 A while the injection molding for the mold  100 B is repeated. 
     Thus, in the second mode, the conveying machine  3 A/ 3 B is used for loading the mold  100 A/ 100 B before the injection molding cycle starts and unloading the mold  100 A/ 100 B after the injection molding cycle finishes. The conveying machine  3 A/ 3 B does not move the mold  100 A/ 100 B while one cycle of injection molding is performed, similar to the first mode. The second mode is effective for a case a predetermined cycle number set for each of the molds  100 A and  100 B is small. In other words, a case of small production and the injection molding is performed while the molds  100 A and  100 B are frequently changed, a large variety of production occurs. 
     In the state illustrated in the right figure in  FIG. 6 , as the operator unloads the used mold  100 A/ 100 B, loads the new mold  100 A/ 100 B, and prepares for the new mold  100 A/ 100 B in the vicinity of the conveying machine  3 A/ 3 B, a door in the door portion  80 A/ 80 B that faces the conveying machine  3 A/ 3 B is closed. This enables reducing a possibility that the operator unintentionally touches an operating mechanism. 
     For example, if the control apparatus  4  stops the injection molding of the mold  100 A in a case where it is detected that the door in the door portion  80 B is opened while the injection molding of the mold  100 A is performed, safety improves. A lock mechanism, such as an electric lock, can be provided at the door in the door portion  80 B, and can lock the door while the injection molding of the mold  100 A is performed. 
     In the state illustrated in the left figure in  FIG. 6 , as the operator unloads the used mold  100 A/ 100 B, loads the new mold  100 A/ 100 B, and prepares for the new mold  100 A/ 100 B in the vicinity of the conveying machine  3 A/ 3 B, a door in the door portion  80 A/ 80 B that faces the conveying machine  3 A/ 3 B is closed. This enables reducing a possibility that the operator unintentionally contacts an operating mechanism. 
     For example, if the control apparatus  4  stops the injection molding of the mold  100 B in a case where it is detected that the door in the door portion  80 A is opened while the injection molding of the mold  100 B is performed, safety improves. A lock mechanism, such as electric lock, can be provided at the door in the door portion  80 A, and the lock mechanism can lock the door while the injection molding on the mold  100 B is performed. 
     A cover with the door can be provided on the conveying machines  3 A and  3 B so that the cover surrounds the conveying machines  3 A and  3 B. 
       FIG. 7  and  FIG. 8  illustrate a configuration of the door portion  80 A/ 80 B suitable for a case where the injection molding machine  2  performs the second mode. 
       FIG. 7  illustrates an appearance of a door portion  700 A as an example of the door portion  80 A in the present embodiment when viewed from the conveying machine  3 A in the +X-axis direction. The door portion  700 A includes a door  701 A, an upper guide rail  702 A and a lower guide rail  703 A for guiding the door in the Y-axis direction, a door cover  82  that accommodates at least a part of the door  701 A, a fixed plate  705 A that covers a side region of the injection molding machine  2 , and a fixed plate  706 A that extends to a portion below the row of the plurality of rollers  32  and plurality of rollers  33  in the conveying machine  3 A. A distal end of the door  701 A is movable between A-A′ line and C-C′ line in  FIG. 7 , and the upper guide rail  702 A and the lower guide rail  703 A guide the movement of the door  701 A. Movable area of the distal end of the door  701 A is illustrated as an arrow  751 A, and movable area of a proximal end of the door  701 A is illustrated as an arrow  752 A. 
     A state where the distal end of the door  701 A is located at A-A′ line (first position) is a completely opened state. In this state, a region of the reverse side of the movable platen  62 , which is a region facing a side opposite to a side at fixed platen  61 , is exposed. A state where the distal end of the door  701 A is located at C-C′ line (second position) is a completely closed state, and the opening formed in the injection molding machine  2  for unloading and loading the mold  100 A is closed. A state where the distal end of the door  701 A is located at B-B′ line (third position) is a partially opened state. When the injection molding on the mold  100 A is performed, the door  701 A is located at the third position. The third position is a position where the distal end of the door  701 A is close to an outer side surface of the conveying machine  3 A. As described above, in this state, the door  701 A does not interfere with unloading of the mold  100 A, but the door  701 A does cover the region of the reverse side of the movable platen  62 . 
     The door  701 A moves in an upper region other than an upper surface  753 A of the plurality of rollers  32 , the plurality of rollers  33 , and the supporting member  53  and the supporting member  54  that support the plurality of rollers  32  and the plurality of rollers  33 . That is, the door  701 A does not interfere with the plurality of rollers  32  and the plurality of rollers  33  and the supporting member  53  and the supporting member  54  that extend inside the injection molding machine  2 , so the door  701 A can shift to the completely closed state. It is difficult to cover the side region of the injection molding machine  2  that is next to the supporting member  54  with the door  701 A, so the fixed plate  705 A is provided for covering this region. It is difficult to cover the side region of the injection molding machine  2  that is below the supporting member  53  and the supporting member  54 , so the fixed plate  706  is provided for covering this region. 
     The door portion  700 A defines a border between the inner area of the injection molding machine  2 . If the door  701 A is closed, the door  701 A covers the opening  81 A, and an access to the inner area of the injection molding machine  2  from the door portion  700 A&#39;s side is blocked. If the door  701 A is opened, the opening  81 A is exposed or formed on the side of the injection molding machine  2  and an access to the inner area of the injection molding machine  2  from the door portion  700 A&#39;s side is provided. If both the door  701 A and the door  701 B are closed, the fixed platen  61  and the moveable platen  62  and other components in the injection molding machine  2  are enclosed by the doors  701 A and  701 B and the door cover  704 . In  FIG. 7 , the door portion  700 A is described as an example of the door portion  80 A. The door portion  80 B also has the same configuration as the door  700 A. 
     In the present embodiment the supporting member  53  and the supporting member  54  extend into the injection molding machine  2 . This results in the plurality of rollers  32  and the plurality of rollers  33  on the supporting member  53  and the supporting member  54 , and the rollers BR fixed to the injection molding machine  2  forming a guide of the mold  100 A/ 100 B conveyed into and out of the injection molding machine  2 . 
     In  FIG. 7 , the door portion  700 A as an example of the door portion  80 A is described. The door portion  80 B also has the same configuration as the door  700 A. 
     As described above, in the present embodiment, the door portion slides above the guiding mechanism on the conveying machine for guiding the unloading and loading of the mold, and the opening for unloading and loading of the mold can be opened and closed. The door portion provides for, the safety for the operator, as it can reduce the possibility that the operator unintentionally touches the movable platen and the heated mold. 
       FIG. 8  illustrates an appearance of a door portion  800 A as an example of the door portion  80 A in another exemplary embodiment when viewed from the conveying machine  3 A in the +X-axis direction. The configuration of  FIG. 8  is the same configuration as the above-described configuration of  FIG. 7 , so the reference numbers from  FIG. 7  are repeated on  FIG. 8 . Thus, their description is omitted herein. The door portion  800 A includes a door  801 A instead of the fixed plates  705 A,  706 A. The distal end of the door  701 A, as stated above, moves between A-A′ line (first position) and C-C′ line (second position). The distal end of the door  801 A only moves between A-A′ line (first position) and B-B′ line (third position). The movable area of the distal end of the door  801 A is illustrated as arrow  853 A. 
     When the injection molding of the mold  100 A is performed in the injection molding machine  2 , it is necessary to locate the door  801 A at the third position for safety purposes. If the door  801 A is moved from the third position, the control apparatus  4  stops the injection molding. 
     This configuration provides for accessing a lower region from the side of the injection molding machine  2 . 
     The door  801 A and the door  701 A can move independently. In another exemplary embodiment, when the door  701 A moves between the first position and the third position, the door  801 A engages with the door  701 A and moves together with the door  701 A. When the door  701 A moves over the third position and moves to a side of the second position, the engagement of the door  701 A and the door  801 A is released, and only the door  701 A moves and the door  801 A does not move. 
     If the injection molding machine  2  only operates in the first mode, another configuration of the door in the injection molding machine  2  exists other than the configuration illustrated in  FIG. 7  and  FIG. 8 .  FIG. 9  illustrates a configuration of a door portion  900 A as an example of the door portion  80 A in another exemplary embodiment.  FIG. 9  illustrates an appearance of the door portion  900 A when viewed from the conveying machine  3 A in the +X-axis direction. The location of the first position, second position, and third position and the basic function of the door portion are the same as in the above-described embodiments, only differences in the configuration and different functions of the present embodiment will be described below. Since the same reference numbers as the above-described embodiment are used, their descriptions will be omitted herein. 
     The door portion  900 A includes a door  901 A, and a movement of the door  901 A in the Y-axis direction is guided by an upper guide  902 A and a lower guide  903 A. A movable area of a distal end of the door  901 A is illustrated as an arrow  951 A, and a movable area of another end of the door  901 A is illustrated as an arrow  952 A. The door  901 A covers the upper region of the movable platen  62  to the lower region of the movable platen  62 . Since the distal end of the door  901 A contacts the supporting member  54 , the door  901  cannot move over the third position in a clamping direction. If the injection molding machine  2  only operates the first mode, the door portion  901 A does not need to move until the second position (completely closed state), and it is enough to provide the function for covering the region of the reverse side of the movable platen  62 . 
     In another exemplary embodiment, the door portion  900 A can be used in the injection molding machine  2  that operates in the second mode along with, other safety measures. 
       FIG. 12  illustrates an injection molding system according to another exemplary embodiment. The reference numbers from  FIG. 2  are repeated in  FIG. 12  and as such, the description of those reference numbers are omitted herein. Only the differences will be described. 
     The injection molding machine  2  includes a supplying unit  71  for supplying lubricant, e.g., oil, grease, etc., to regions, such as the tie-bars  64  and the rollers BR, of the injection molding machine  2  to reduce friction resistance. The lubricant is stored in the supplying unit  71  and the lubricant is supplied regularly through a tube  72 . Supplying timing of the lubricant can, for example, be determined based on a production number of the molded part. The supplying unit  71  can also supply the lubricant to the plurality of rollers  32  and plurality of rollers  33  in the conveying machine  3 A and conveying machine  3 B via tube  73  and tube  74  respectively. The timing of supplying the lubricant to the plurality of rollers  32  and plurality of rollers  33  synchronizes with the timing of supplying the lubricant to the tie-bar  64 . However, the timing of supplying the lubricant can be at different times. 
       FIG. 13  illustrates is a side view of an injection molding system according to another exemplary embodiment.  FIG. 13  differs from  FIG. 12  in that the supplying mechanism of the lubricant to the plurality of the rollers  32  and plurality of rollers  33 . A tube  76  supplies the lubricant from the supplying unit  71  to the plurality of rollers  33 . The tube  76  extends above (upward) the plurality of rollers  33 . A flow path  75  for distributing the lubricant to the plurality of rollers  32  is located in the supporting member  53 , where the lubricant is supplied from the tube  76  to the flow path  75 . 
       FIG. 14  illustrates a cross sectional view of general roller bearing  400  that is used for the plurality of rollers  32 , the plurality of rollers  33  and the rollers BR of the present embodiment. Any roller bearing mechanism that would enable practice of the present embodiment is applicable. 
     In the roller bearing  400 , an outer ring  401  rotates in a state where the friction is small by the function of a plurality of rolling body  402 . The rolling body  402  is supported by a holder  403  in a state where a position of the rolling body  402  is fixed and the rolling body  402  is rotatable around a rotation axis of the rolling body  402 . The holder  403  is fixed in a state where the holder  403  cannot rotate relative to the inner ring  404 . A columnar space for a bolt (not illustrated) is formed inside the inner ring  404 . The inner ring  404  is fixed to a fixing member, e.g. the supporting member  53 , by the bolt. Thus, the positions of the holder  403  and the rolling body  402  are fixed. The outer ring  401  rotates relative to the inner ring  404 . 
     The lubricant is supplied via the tube  406  to at least one of gaps  405  surrounded by an inner wall of the outer ring  401 , an outer wall of the holder  403 , and an outer wall of the rolling body  402 . If the lubricant is supplied to at least one of the gaps  405 , the lubricant flows between the rolling body  402  and the outer ring  401  based on the rotation of either the outer ring  401  or the rolling body  402 , and flows to the next gap  405  across the rolling body  402 . By repeating this flow, the lubricant enters each boundary surface between the rolling bodies  402  and the outer ring  401 . The friction is reduced significantly based on the above-described lubricant flow. While it is preferable to locate the edge of the tube  406  near one of the boundary surfaces between the outer ring  401  and the rolling bodies  402 , as the lubricant moves, it is enough to supply the lubricant to the gap  405 . 
     Definitions 
     In referring to the description, specific details are set forth in order to provide a thorough understanding of the examples disclosed. In other instances, well-known methods, procedures, components and circuits have not been described in detail as not to unnecessarily lengthen the present disclosure. 
     It should be understood that if an element or part is referred herein as being “on”, “against”, “connected to”, or “coupled to” another element or part, then it can be directly on, against, connected or coupled to the other element or part, or intervening elements or parts may be present. In contrast, if an element is referred to as being “directly on”, “directly connected to”, or “directly coupled to” another element or part, then there are no intervening elements or parts present. When used, term “and/or”, includes any and all combinations of one or more of the associated listed items, if so provided. 
     Spatially relative terms, such as “under” “beneath”, “below”, “lower”, “above”, “upper”, “proximal”, “distal”, and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the various figures. It should be understood, however, that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, a relative spatial term such as “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein are to be interpreted accordingly. Similarly, the relative spatial terms “proximal” and “distal” may also be interchangeable, where applicable. 
     The term “about,” as used herein means, for example, within 10%, within 5%, or less. In some embodiments, the term “about” may mean within measurement error. 
     The terms first, second, third, etc. may be used herein to describe various elements, components, regions, parts and/or sections. It should be understood that these elements, components, regions, parts and/or sections should not be limited by these terms. These terms have been used only to distinguish one element, component, region, part, or section from another region, part, or section. Thus, a first element, component, region, part, or section discussed below could be termed a second element, component, region, part, or section without departing from the teachings herein. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. The use of the terms “a” and “an” and “the” and similar referents in the context of describing the disclosure (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “includes”, “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Specifically, these terms, when used in the present specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof not explicitly stated. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. For example, if the range 10-15 is disclosed, then 11, 12, 13, and 14 are also disclosed. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the disclosure and does not pose a limitation on the scope of the disclosure unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the disclosure. 
     It will be appreciated that the methods and compositions of the instant disclosure can be incorporated in the form of a variety of embodiments, only a few of which are disclosed herein. Variations of those embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the disclosure to be practiced otherwise than as specifically described herein. Accordingly, this disclosure includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the disclosure unless otherwise indicated herein or otherwise clearly contradicted by context. 
     Combinations of any exemplary embodiments disclosed above are also included as embodiments of the present disclosure. While the above-described exemplary embodiments discuss illustrative embodiments, these embodiments are not seen to be limiting.