JP6488965B2 - Box changer - Google Patents

Description

  The present invention relates to a box exchange device for exchanging an order box and an empty box between an order carriage and a station.

  Conventionally, the ordering work, which is the work of arranging necessary parts in the order of the specifications of the products flowing through the product assembly line, has been performed in a stationary station. In the invention disclosed in Patent Document 1, an empty box collected from a product assembly line is received in a box conveyance device as a station, and an ordered box in which parts are put by an operator's ordering work is supplied to the product assembly line. doing. And power means, such as air or electricity, is not used for conveyance of an empty box and a standing box in a box conveyance device.

Japanese Patent Laid-Open No. 9-136715

  By the way, if it is going to carry out the ordering work of the parts assembled in various products at the station, it is necessary to collect many kinds of parts around the station, which may cause difficulty in space. In such a case, it is efficient to use an ordering cart that supplies an ordering box in which parts are ordered in a plurality of places and the ordered parts are stored to the station and receives an empty box from the station. At this time, it is desirable that the order box and the empty box can be exchanged between the order cart and the station by simple means.

  In view of such a point, an object of the present invention is to provide an apparatus capable of exchanging an order box and an empty box by a simple operation without using a power means between the order carriage and the station.

  A first invention of the present invention is a box exchange device for exchanging a standing box and an empty box between a station and a standing carriage brought into contact with the station, wherein the standing carriage includes a carriage frame, It is attached to the carriage frame in a state where it is connected to the push-down portion with the first wire, and when the push-down portion is pushed down, it moves up and moves to the raised position, and when the load pushing down the push-down portion is released, it is lowered. A loading platform frame disposed so as to move to the lowered position, a stopper that holds the loading platform frame in the ascending position so as not to be lowered with respect to the carriage frame, and a tiltable attachment to the loading platform frame, The inclined box or the empty box can be placed, and the inclined position is inclined downward toward the station where the ordered carriage is in contact, and the reverse inclination is inclined downward toward the opposite side of the station in contact with the station. And a stopper that is provided with a downwardly extending portion that extends downward and is configured to tilt when the downwardly extending portion is pressed to assume an inclined posture, and the stopper And when the loading platform is in the inclined posture, it engages with a part of the downward extending portion and when the loading platform returns to the reverse inclined posture, it is pulled and slid by the downward extending portion. Then, the second wire is pulled to release the stopper, and then the slide lock that releases the engagement with a part of the downwardly extending portion is moved between a state protruding from the cart frame and a buried state. A projecting pin that is urged in a projecting state, and is coupled to the projecting pin by a third wire; when the cargo frame is in the lowered position, it projects on the cargo bed and tilts by the contact of the empty box; Tow the third wire And a detection lever that makes the protruding pin buried in the station, wherein the station has a cart pushing portion and a conveyance path portion adjacent to the cart pushing portion, and the cart pushing portion is a A first slide part that contacts the protruding pin when sliding and slides in the carriage pushing direction, and is connected to the first slide part by a fourth wire and pulled by the fourth wire by the slide of the first slide part and pulled up. A first weight portion that is formed, and the transport path portion includes an upper transport path that sends the upright box with a downward slope toward the opposite side from the carriage push-in portion side by its own weight, and the upper transport path An upper holding portion that is disposed on the opposite side of the cart pushing portion and holds the order box, and an empty box that is disposed on the lower side of the upper conveying path and is inclined downward toward the cart pushing portion side. A lower conveyance path that sends the vehicle in its downward direction by its own weight, a lower holding section that is disposed on the carriage pushing section side of the lower conveyance path and that holds the empty box, and the forward carriage is pushed into the carriage pushing section. And a pressing lever disposed so as to be able to swing between a position that contacts the lower extending portion and presses the lower extending portion and a position that does not press the upper extending portion, and the upper holding portion is the carriage It is disposed so as to be movable toward the opposite side of the pushing portion side and is connected to the pressing lever by a fifth wire, and moves when the standing box abuts the upper holding portion to move the fifth wire. It is configured to swing the pressing lever to a position where it is not pressed by pulling, and the lower holding part is retracted from the lower conveyance path when the loading frame or the loading bed that is lowered to the lower holding part comes into contact. Configured to release the holding of the empty box In the state in which the order box is placed on the cargo bed of the order cart, the projecting pin comes into contact with the first slide portion when the order cart is pushed into the cart pushing portion. The first slide part slides to pull up the first weight part, the lower extension part comes into contact with the pressing lever, the cargo bed becomes the inclined posture, and the standing box is placed in the upper conveyance path. The delivery box is brought into contact with the upper holding portion and the upper holding portion is moved, so that the pressing lever is swung to a position where the pressing lever is not pressed, so that the lower extending portion is not in contact with the pressing lever. When the loading platform returns to the reverse inclined posture, the slide lock slides and the stopper is released, the loading platform frame descends and comes into contact with the lower holding portion to release the holding of the empty box, and the empty box is moved to the lower position. From the transport path The projection pin is buried in the state where the detection lever is tilted by being sent to a table, the engagement between the projection pin and the first slide part is released, the first weight part is lowered, and the first weight part is It is configured to move the loading platform on which the empty box is placed by pushing down the push-down portion to the raised position.

  According to the first aspect of the present invention, the propulsion box containing the parts that have undergone the propulsion work at an appropriate place is placed on the propulsion carriage and carried to the station, and the propulsion box is simply pushed into the cart pushing portion. And an empty box placed on the station can be exchanged. And in this operation, it can carry out only by a mechanical action, without using power means, such as air or electricity. That is, the order box and the empty box can be exchanged by a simple operation that does not require the use of power means between the order carriage and the station and the operator does not need to bend and stretch the waist.

  According to a second aspect of the present invention, in the first aspect, the cart pushing portion includes a second slide portion that contacts the cart frame and slides in the cart pushing direction when the stepping cart is pushed, The push-in part or the conveyance path part is connected to the second slide part by a sixth wire, and is pulled by the sixth wire by the slide of the second slide part and pulled up by the sixth wire. From the cart pushing portion of the cart frame, the cart is pushed into the cart pushing portion, and the downwardly extending portion abuts on the pressing lever so that the cargo bed is in the inclined posture and engages the cart frame. An engagement lever that prevents withdrawal, and the engagement lever is connected to the first weight portion by a seventh wire, and when the first weight portion is lowered, the engagement lever is used to pull the seventh wire. Ri, characterized in that it is configured to release the engagement between the carriage frame.

  According to the second aspect of the present invention, the forward cart is pushed into the cart pushing portion by the engagement lever in a state in which the cart is pushed into the cart pushing portion, the downward extending portion comes into contact with the pressing lever, and the loading platform is inclined. Retained. At this time, since the second slide part comes into contact with the carriage frame and the second weight part is pulled up, a force for pushing out from the carriage pushing part is applied by the weight of the second weight part. When the engagement of the engagement lever with the carriage frame is released by the lowering of the first weight part, the upright carriage is pushed out from the carriage push-in part. This makes it possible for the operator to sense that the replacement of the ordering box and the empty box has been completed, and to easily pull out the ordering cart from the cart pushing portion.

  According to a third aspect of the present invention, in the first aspect or the second aspect, the projecting pins of the sequential carriage are provided in a pair of left and right, and the first slide portion and the first weight portion of the station are: A pair of left and right is provided.

  According to the third aspect of the present invention, the cart is pushed into the cart pushing portion while pressing the pair of left and right projecting pins against the pair of left and right first slide portions of the station. And can be exchanged smoothly with empty boxes.

It is a side view which shows the whole structure of the box exchange apparatus concerning one Embodiment of this invention. FIG. 2 is an enlarged view of the order cart in FIG. 1. FIG. 3 is a plan view of a sequential carriage in FIG. 2. It is a figure which shows the engagement state of a carrier frame and a stopper. It is an enlarged view of the station in FIG. It is a top view of the station in FIG. It is a figure explaining operation | movement of the box exchange apparatus in the said embodiment. (First step) It is a figure explaining operation | movement of the box exchange apparatus in the said embodiment. (Second step) It is a figure explaining operation | movement of the box exchange apparatus in the said embodiment. (Third step) It is a figure explaining operation | movement of the box exchange apparatus in the said embodiment. (4th step) It is a figure explaining operation | movement of the box exchange apparatus in the said embodiment. (5th step) It is a figure explaining operation | movement of the box exchange apparatus in the said embodiment. (6th step)

[Box exchange device 1]
1 to 12 show an embodiment of the present invention. As shown in FIG. 1, the box exchange device 1 according to the present embodiment includes a standing carriage 2 and a station 3. The order cart 2 is a cart that carries the order box 4A containing the parts ordered at a predetermined place to the station 3 and sends it to the station 3, and receives the empty box 4B from the station 3 and carries it to the predetermined place. The station 3 is a stationary device that supplies the standing box 4A to the product assembly line and collects the empty box 4B. In the replacement operation of the order box 4A and the empty box 4B between the order carriage 2 and the station 3, power means such as air or electricity is not used but mechanical means using human power and gravity are used. It should be noted that the order box 4A and the empty box 4B are used by repeating the exchange operation with the same shape and the same size. In FIG. 1, the front, rear, up, down, right, and left directions are indicated by arrows with the direction in which the cart 2 is brought into contact with the station 3 as the front. In each figure, directions are shown according to FIG. 1, and in the following description, descriptions regarding directions are made with reference to these directions.

(Order cart 2)
As shown in FIGS. 2 to 4, the order cart 2 includes a cart frame 21, a cargo bed frame 22, a cargo bed 23, a stopper 24, a slide lock 25, a protruding pin 26, and a detection lever 27. Prepare.

<Dolly frame 21>
As shown in FIGS. 2 and 3, the bogie frame 21 is formed by connecting an upper frame 21 a having a rectangular shape when viewed from above and a lower frame 21 b having a rectangular shape when viewed from above by a pair of front frames 21 c at a front corner portion. The frame is connected by a rear frame 21d to form a substantially rectangular parallelepiped frame. Between the left and right front frames 21c and the rear frame 21d, an intermediate frame 21m is disposed that is connected in the vicinity of the substantially central portion in the vertical direction. A lower horizontal frame 21n extending in the left-right direction is disposed at a substantially central portion in the front-rear direction of the lower frame 21b. Inside the pair of rear frames 21d, slide grooves 21d1 extending in the vertical direction are formed. A rear portion of the upper frame 21a is provided with a handle portion 21e that is substantially U-shaped when viewed from above, and is vertically extended between a rear end portion of an extension portion 21f extending rearward from the left and right rear corner portions of the lower frame 21b. A pair of gap forming column portions 21g extending in the direction is attached. Between the rear frame 21d and the gap forming column portion 21g, a gap portion 21h is formed in which left and right end portions of an upper and lower slide bar 22h described later are slidably held in the up and down direction. A pair of fixed casters 21i movable in the front-rear direction are attached to the front lower surface of the lower frame 21b, and a pair of swivelable casters 21j are attached to the rear lower surface of the lower frame 21b. As a result, the carriage frame 21 can be moved by the operator holding and pushing the handle portion 21e. A substantially L-shaped L-shaped member 21k is attached to the rear part of the upper frame 21a and the upper part of the rear frame 21d in the left and right sides. A portion extending in the front-rear direction of the L-shaped member 21k is a stopper shaft 21k1, and a stopper 24 described later is rotatably supported.

<Loading frame 22>
As shown in FIGS. 2 and 3, the load carrier frame 22 has a pair of upper and lower horizontal frames 22a and 22b extending in the left-right direction and a pair of links extending between the upper and lower horizontal frames 22a and 22b. And a rear upper and lower frame 22c. Further, the loading frame 22 includes a pair of vertical frames 22d extending in the front-rear direction, a front horizontal frame 22e connecting between the front ends of the pair of vertical frames 22d, and a pair of front upper and lower extending downward from the front end of the front horizontal frame 22e. It has a frame 22f and a bracing frame 22g that connects the lower horizontal frame 22b and the vertical frame 22d in a bracing manner. A connection point between the upper horizontal frame 22a and the lower horizontal frame 22b and the pair of rear upper and lower frames 22c is a portion slightly inward from the left and right ends of the upper horizontal frame 22a and the lower horizontal frame 22b. The rear end portions of the pair of vertical frames 22d are attached to a connection point between the upper horizontal frame 22a and the upper end portions of the rear upper and lower frames 22c. The upper end portion of the brace frame 22g is attached to the lower surface portion of the longitudinal frame 22d at the substantially central portion in the front-rear direction, and the lower end portion of the brace frame 22g is attached to the connection point between the lower horizontal frame 22b and the lower end portion of the rear upper and lower frame 22c It is done. Rollers (not shown) are attached to the left and right ends of the upper horizontal frame 22a and the lower horizontal frame 22b, and are attached to the slide groove 21d1 via the rollers so as to be movable in the vertical direction. A load carrier support portion 22g1 extending inward in the left-right direction is provided at a substantially central portion in the front-rear direction of the pair of bracing frames 22g. A pair of fixed pulleys 21i is attached to the rear end portion of the upper frame 21a, and connects the connecting point between the vertical frame 22d of the upper horizontal frame 22a and the portion slightly inward from the left and right end portions of the upper and lower slide bars 22h. A first wire 22i is hung from above. A third weight portion 22j is attached to the vertical slide bar 22h. When the upper and lower slide bars 22h are supported by the gap portion 21h and slid upward, the load carrier frame 22 moves downward. When the vertical slide bar 22h slides downward, the load carrier frame 22 moves upward. The total weight of the upper and lower slide bars 22h and the third weight portion 22j is set to be smaller than the weight of the load carrier frame 22, and in the state where the stopper 24 described later is not engaged with the vertical frame 22d of the load carrier frame 22, the load carrier frame 22 is The upper and lower slide bars 22h are located at the upper end. Here, the upper and lower slide bars 22h correspond to a “pressing portion” in the claims.

<Loading platform 23>
As shown in FIGS. 2 and 3, the loading platform 23 includes a rotation shaft 23 a extending in the left-right direction, four roller conveyors 23 b extending in the front-rear direction, the front lower portion of which is fixed to the rotation shaft 23 a, and a rotation shaft. 23a has a lower arm portion 23c whose upper end portion is fixed and extends downward, and a forearm portion 23d whose rear end portion is fixed to the rotating shaft 23a and extends forward. The left and right end portions of the rotation shaft 23 a are rotatably supported by the lower end portions of the left and right front upper and lower frames 22 f of the loading frame 22. The four roller conveyors 23b are connected to each other at the rear by a connecting member 23e, and rotate when the rotating shaft 23a is rotated with respect to the loading frame 22 in combination with the fixing with the rotating shaft 23a. It rotates in the vertical direction as a unit around the shaft 23a. The roller conveyor 23b is a member in which a plurality of rollers are rotatably attached to the frame body, and can move a box placed thereon by its own weight in a downward gradient direction. The lower arm portion 23c is an inverted T-shaped member in a side view, and a cylindrical contact portion 23c1 that contacts a pressing lever 56 of the station 3 described later is provided at a front end portion thereof, and a slide lock described later is provided at a rear end portion thereof. And a cylindrical engaging portion 23c2 that engages with 25. The forearm portion 23d is a T-shaped member as viewed from above, and the end portion of the T-shaped vertical bar portion is fixed to the rotation shaft 23a so that the T-shaped horizontal bar portion is parallel to the rotation shaft 23a. The forearm portion 23d is a portion that comes into contact with a lower holding portion 54 of the station 3 described later when the loading platform 23 is lowered together with the loading platform frame 22. The loading platform 23 is disposed so as to be inclined downward toward the upper horizontal frame 22a of the loading platform frame 22 at the normal time, and each of the rear portions of the two outer roller conveyors 23b is connected to the loading platform support portion 22g1 of the loading platform frame 22. The rotation is stopped by contact. In this state, the order box 4A or the empty box 4B is placed on the loading platform 23, and the rear end portion of the order box 4A or the empty box 4B comes into contact with the upper horizontal frame 22a to stop the movement. Here, the lower arm portion 23c corresponds to a “downward extending portion” in the claims.

<Stopper 24>
As shown in FIGS. 2 to 4, the stopper 24 is a substantially L-shaped member in front view. Although a pair of left and right is provided at the rear upper part of the carriage frame 21, the right stopper 24 will be described with reference to FIG. In the stopper 24, an upper rod portion 24a and a lower rod portion 24b are fixed via a cylindrical portion 24c, and an inner cylinder portion of the cylindrical portion 24c is rotatably supported by a stopper shaft 21k1. A roller 24a1 is attached to the upper end portion of the upper bar portion 24a and the rear side surface slightly below. A fourth weight portion 24b1 is provided at the tip of the lower rod portion 24b. The fourth weight portion 24b1 is urged to rotate clockwise in FIG. 4, and the rotation is stopped by a stopper (not shown) provided between the rear frame 21d. ing. When the loading frame 22 rises from below in this state, as shown in FIG. 4, the vertical frame 22d of the loading frame 22 is held between the roller 24a1 and the upper bar portion 24a, and the loading frame 22 is lowered. Stopped. One end of the second wire 24e is fixed at a position corresponding to the roller 24a1 on the front side surface of the upper bar portion 24a. The other end of the second wire 24e will be described later via a fixed pulley 24f and a fixed pulley 24g fixed to the rear frame 21d, and a fixed pulley 24h fixed slightly rearward in the front-rear direction center of the middle frame 21m. The slide lock 25 is fixed to the rear end of the lock lever 25a.

<Slide lock 25>
As shown in FIGS. 2 and 3, a pair of slide locks 25 are provided on the left and right, but the right and left slide locks 25 will be described with reference to FIG. The slide lock 25 includes a sliding portion 25b attached to the middle frame 21m of the carriage frame 21 so as to be slidable in the front-rear direction, and a lock lever 25a pivotally supported so as to be vertically rotatable with respect to the sliding portion 25b. And having. The lock lever 25a is a plate-like member having a substantially L shape in a side view. A notch portion 25a3 is provided in the vicinity of the front end portion of the upper plate portion 25a1, and the other end portion attaching portion 25a5 of the second wire 24e is provided in the vicinity of the rear end portion. In the vicinity of the lower end portion of the lower plate portion 25a2, there is provided a rotation shaft 25a4 that rotatably supports the lock lever 25a with respect to the sliding portion 25b. As a result, the slide lock 25 is pulled by the second wire 24e and is located at the rearmost part in the normal state. When the loading platform 23 rotates clockwise in FIG. 2 and the engaging portion 23c2 contacts the front end of the lock lever 25a and moves backward, the lock lever 25a rotates counterclockwise in FIG. The engaging portion 23c2 is received in the notch 25a3 and returns to the original posture. When the loading platform 23 pivots counterclockwise in FIG. 2 from this state, the lock lever 25a is pulled and moved forward to pull the second wire 24e, thereby rotating the stopper 24 counterclockwise in FIG. Then, the holding of the vertical frame 22d of the cargo bed frame 22 is released. Then, the loading frame 22 descends together with the loading platform 23 to disengage the engaging portion 23c2 from the notch 25a3. The stopper 24 returns to the normal position shown in FIG. 4 by the action of the fourth weight portion 24b1, and accordingly, the slide lock 25 is also pulled by the second wire 24e to return to the original last position. The slide lock 25, the stopper 24, and the loading platform 23 are configured to perform such a series of mechanical operations.

<Projecting pin 26>
As shown in FIGS. 2 and 3, a pair of left and right protruding pins 26 are provided, but the right protruding pin 26 will be described with reference to FIG. The protruding pin 26 is slidable in the vertical direction on a cylindrical cylindrical portion 26a fixed to the front right side of the upper frame 21a of the carriage frame 21 with the axial direction aligned with the vertical direction, and on the inner cylindrical portion of the cylindrical portion 26a. And a cylindrical pin portion 26b supported by the first and second cylinders. The pin portion 26b is supported by being biased upward with respect to the cylindrical portion 26a, and a part of the pin portion 26b protrudes upward from the upper surface portion of the cylindrical portion 26a in a normal state as shown in FIG. The protruding portion of the pin portion 26b comes into contact with a contact portion 41c of the first slide portion 41 of the station 3 described later. One end of the third wire 26c is fixed to the lower end of the pin portion 26b. The other end of the third wire 26c includes a fixed pulley 26d fixed on the right front side of the lower frame 21b, a fixed pulley 26e fixed on the right front side of the lower horizontal frame 21n, and a fixed pulley 26f fixed on the right side of the lower frame 21b. It fixes to the lower end part of the detection lever 27 mentioned later via this order.

<Detection lever 27>
As shown in FIG. 2 and FIG. 3, the detection lever 27 is provided as a pair on the left and right, but the right detection lever 27 will be described with reference to FIG. The detection lever 27 is a cylinder disposed in the vicinity of the center between the right and left center and the right end of the lower horizontal frame 21n of the carriage frame 21 so that the inner cylinder portion is slidably in contact with the lower horizontal frame 21n. It has a portion 27a, an upper arm portion 27b fixed to the cylindrical portion 27a and extending upward in the radial direction, and a lower arm portion 27c fixed to the cylindrical portion 27a and extending downward in the radial direction. The upper arm portion 27b and the lower arm portion 27c are arranged on the same straight line via the cylindrical portion 27a. The upper arm portion 27b is disposed between the right end and the adjacent roller conveyor 23b in a top view in a normal state, and as shown in FIG. 10, the upper arm portion 27b extends from the upper surface of the roller conveyor 23b of the loading platform 23 in a lowered state in a side view. The tip portion is disposed so as to protrude. The other end portion of the third wire 26c is fixed to the lower end portion of the lower arm portion 27c. Further, the detection lever 27 is normally urged clockwise in FIG. 2 and stopped by a stopper (not shown). Thus, as shown in FIG. 10, when the empty box 4B moves from the station 3 due to gravity, the tip of the upper arm 27b comes into contact with the rear end of the empty box 4B and rotates counterclockwise in FIG. The third wire 26c is pulled along with the pushing. And the pin part 26b of the protrusion pin 26 moves below by the pulling to the downward direction by the 3rd wire 26c, and is buried in the cylinder part 26a. The protruding pin 26 and the detection lever 27 are configured to perform such a series of mechanical operations.

(Station 3)
As shown in FIG. 5 and FIG. 6, the station 3 includes a carriage pushing portion 4 and a conveyance path portion 5. The cart pushing portion 4 and the conveyance path portion 5 are integrally formed by the frame 10 and are fixed on the floor F.

<Frame 10>
As shown in FIGS. 5 and 6, the frame 10 is formed by connecting an upper frame 11 having a substantially U shape in a top view and a lower frame 12 having a substantially U shape in a top view by a pair of front frames 13 at a front corner portion. A pair of rear frames 14 are connected at the ends to form a main frame. An upper vertical frame 15 and a lower vertical frame 16 are disposed between the upper part of the left and right front frames 13 and the upper part of the rear frame 14. A pair of lower extensions 13a and a pair of rear extensions 14a are disposed on the lower surface of the lower frame 12 at positions corresponding to the positions of the pair of front frames 13 and the pair of rear frames 14, respectively. The height of the lower vertical frame 16 from the floor F is substantially equal to the height of the upper frame 21a of the sequential carriage 2 from the floor F. Between the left and right lower vertical frames 16 and the lower frame 12, a front upper and lower frame 17a and a rear upper and lower frame 17b are disposed at substantially equal intervals in the front-rear direction. Further, a lower horizontal frame 18 is disposed between the connecting portions of the lower frame 12 and the lower ends of the front upper and lower frames 17a, and the right side of the central portion in the front-rear direction between the front upper and lower frames 17a and the front frame 13 is disposed. An additional upper and lower frame 17 c is disposed between the lower vertical frame 16 and the lower frame 12. Here, the part including the front upper and lower frames 17a and the front part thereof is the transport path part 5, and the other part is the cart pushing part 4. All members constituting the frame 10 are pipe-shaped members having a circular cross section.

<Carriage pushing part 4>
As shown in FIGS. 5 and 6, the carriage pushing portion 4 includes a pair of left and right first slide portions 41 and a pair of left and right first weight portions 42. Since both the first slide part 41 and the first weight part 42 have a symmetrical shape and structure, the first slide part 41 and the first weight part 42 on the right side will be described with reference to FIG. The first slide portion 41 includes two cylindrical slide portions 41a, a connecting portion 41b that connects the two cylindrical slide portions 41a at the lower portion, and a contact that extends from the connecting portion 41b toward the left side (inward direction). Part 41c. The cylindrical slide portion 41a is arranged so that its inner cylinder portion is slidably contacted with the upper vertical frame 15 and slidable in the front-rear direction, and slides in the front-rear direction integrally with the connecting portion 41b. One end of the fourth wire 41d is fixed to the lower side of the connecting portion 41b. The first weight portion 42 is slidable in the vertical direction with the inner wall portion of a cylindrical hole (not shown) provided in the center extending in the vertical direction in the top view in sliding contact with the rear vertical frame 17b. It is arranged. A moving pulley 42 a is fixed to the rear side near the upper end of the first weight portion 42. The other end of the fourth wire 41d is a fixed pulley 41e fixed on the upper left side of the rear end of the lower vertical frame 16, a fixed pulley 41f fixed on the lower left side of the rear vertical frame 17b on the lower vertical frame 16, The fixed pulley 41g fixed to the lower left side of the connecting part of the rear vertical frame 17b of the lower vertical frame 16 and the movable pulley 42a is fixed to the front side in the vicinity of the upper end of the first weight part 42 in this order. Accordingly, when the first slide part 41 moves forward, the first weight part 42 rises, and when the first slide part 41 moves backward, the first weight part 42 descends. In a normal state, the first slide portion 41 is located at the rear end of the front-rear direction sliding range, and the first weight portion 42 is located at the lower end of the up-down direction sliding range. A cylindrical insertion hole 42c is provided on the front right side of the first weight portion 42 on the left side so as to penetrate in the vertical direction. The function of the insertion hole 42c will be described later.

  As shown in FIGS. 5 and 6, the cart pushing portion 4 further has a second slide portion 43. The second slide portion 43 is attached only to the lower vertical frame 16 between the right front upper and lower frames 17a and the rear upper and lower frames 17b. The second slide part 43 includes two cylindrical slide parts 43a, a connection part 43b for connecting the two cylindrical slide parts 43a at the lower part, and a contact extending from the connection part 43b toward the left side (inward direction). Part 43c. The cylindrical slide portion 43a is arranged so that its inner cylinder portion is slidably contacted with the lower vertical frame 16 and slidable in the front-rear direction, and slides in the front-rear direction integrally with the connecting portion 43b. One end of the sixth wire 43d is fixed to the lower side of the connecting portion 43b. The second slide part 43 is connected to a second weight part 58 disposed in the transport path part 5 by a sixth wire 43d. In a normal state, the second slide portion 43 is located at the rear end of the longitudinal sliding range. This connection mechanism and operation will be described later.

<Conveyance path section 5>
As shown in FIGS. 5 and 6, the conveyance path unit 5 includes an upper conveyance path 51, an upper holding part 52, a lower conveyance path 53, a lower holding part 54, a pressing lever 56, and an engagement lever 57. And a second weight part 58.

  As shown in FIGS. 5 and 6, the upper conveyance path 51 includes four roller conveyors 51 a extending in the front-rear direction and spanned between the upper front support member 51 b and the upper rear support member 51 c at a predetermined interval. It is fixed and formed. The roller conveyor 51a is a member in which a plurality of rollers are rotatably attached to a frame, and can move a box placed thereon by its own weight in a downward gradient direction. The upper front support member 51b is disposed between the left and right front frames 13, and the upper rear support member 51c is disposed between the left and right front upper and lower frames 17a. The upper rear support member 51c is disposed at a position where the height from the floor F is higher than the upper front support member 51b, and the roller conveyor 51a is disposed in a downward gradient toward the front direction. The descending slope is such that the front portion of the cart 2 is brought into contact with the transport path portion 5 and locked by an engagement lever 57 described later, and the loading platform 23 is lowered and the loading platform 23 is lowered forward. When inclined to the gradient, the gradient is linearly continuous with the roller conveyor 23b of the loading platform 23. Accordingly, the ordering box 4A placed on the loading platform 23 of the ordering cart 2 is smoothly moved to the upper conveyance path 51 by its own weight.

  As shown in FIGS. 5 and 6, the upper holding portion 52 includes a slide portion 52 a and a support portion 52 b that supports the slide portion 52 a so as to be slidable in the front-rear direction with respect to the frame 10. The support portion 52b has a pair of support pipes 52b1 extending in the front-rear direction, and the support pipes 52b1 are arranged at a predetermined interval inside the upper frame 11 and their front and rear portions are connected to the upper frame 11. Connecting pipe 52b2. The slide portion 52a has a substantially U-shaped slide frame 52a1 opened rearward in a top view, and an axial direction attached to the front and rear portions of the left and right upper surfaces of the slide frame 52a1 via a connecting portion 52a3. And a cylindrical tube portion 52a2 that is disposed so as to coincide with each other. The cylindrical portion 52a2 is disposed so that its inner cylindrical portion is slidably contacted with the support pipe 52b1 in the front-rear direction, and slides in the front-rear direction integrally with the connecting portion 52a3 and the slide frame 52a1. A stopper (not shown) is provided between the support pipe 52b1 and the cylindrical portion 52a2 in the front and rear to restrict the front and rear sliding range. One end of a fifth wire 52c is fixed below the left and right opening ends of the slide frame 52a1. The other end portion of the fifth wire 52c is connected to a pressing lever 56 described later via a fixed pulley 52d fixed to the upper surface portion of the upper rear support member 51c.

  As shown in FIGS. 5 and 6, in the lower conveyance path 53, four roller conveyors 53a extending in the front-rear direction are spanned between the lower front support member 53b and the lower rear support member 53c at a predetermined interval. It is fixed and formed. The roller conveyor 53a is substantially the same as the roller conveyor 51a. The lower front support member 53b is disposed between the left and right front frames 13, and the lower rear support member 53c is disposed between the left and right front upper and lower frames 17a. The lower front support member 53b is disposed at a position where the height from the floor F is higher than the lower rear support member 53c, and the roller conveyor 53a is disposed in a downward gradient in the rearward direction. The descending slope is such that the front portion of the cart 2 is brought into contact with the transport path portion 5 and locked by an engagement lever 57 described later, and the loading platform 23 is lowered and the loading platform 23 is lowered rearward. When inclined to the gradient, the gradient is linearly continuous with the roller conveyor 23b of the loading platform 23. As a result, the empty box 4B placed on the lower conveyance path 53 is smoothly moved by its own weight to the loading platform 23 of the upright cart 2. The four roller conveyors 53a are connected by a connecting member 53d extending in the left-right direction on the lower surface on the rear side.

  As shown in FIGS. 5 and 6, the pair of lower holding portions 54 supports an arm portion 54a having an L shape in a side view and the arm portion 54a so as to be slidable in a substantially vertical direction with respect to the connecting member 53d. It has a cylindrical portion 54b and an elastic member 54c that urges the arm portion 54a upward. The arm portion 54a has an upper arm portion 54a1 extending substantially in the vertical direction and a lower arm portion 54a2 extending substantially in the front-rear direction. The cylindrical portion 54b includes a rear portion of the connecting member 53d between the right end roller conveyor 53a and the adjacent roller conveyor 53a, and a rear portion of the connecting member 53d between the left end roller conveyor 53a and the adjacent roller conveyor 53a. It is fixed with the axial direction substantially up and down. The upper arm portion 54a1 is slidably contacted with the inner cylinder portion of the cylinder portion 54b and is slidable substantially in the vertical direction, and is elastic between the lower arm portion 54a2 and the roller conveyor 53a. The upper arm portion 54a1 protrudes upward from the upper surface portion of the roller conveyor 53a while being biased upward by the member 54c. In a normal state, the upper arm portion 54a1 is held so as not to move rearward with the rear end portion of the empty box 4B in contact with the upper end portion of the upper arm portion 54a1. A rubber cushioning material 54a21 is disposed on the upper surface of the rear end portion of the lower arm portion 54a2. As will be described later, the cushioning material 54a21 has the front portion of the stepped carriage 2 brought into contact with the transport path portion 5 and locked by an engagement lever 57 described later, and the loading platform 23 of the stepped carriage 2 that has been lowered. The forearm portion 23d is a contact portion.

  As shown in FIGS. 5 and 6, the pair of pressing levers 56 attaches a roller 56 b to the rear end portion of the rod-shaped portion 56 a and supports the front end portion of the rod-shaped portion 56 a so as to be rotatable in the vertical direction with respect to the frame 10. It is a member. Specifically, the rotating shaft 56d is supported from the front upper and lower frame 17a via a support member 56c having an L shape when viewed from above, and the front end portion of the rod-shaped portion 56a is attached to the rotating shaft 56d. The mounting position of the pressing lever 56 in the left-right direction is between the upper frame 11 and the left end roller conveyor 51a and between the upper frame 11 and the right end roller conveyor 51a. The mounting position of the pressing lever 56 in the vertical direction is substantially the upper conveying path. Between the rear end portion of 51 and the rear end portion of the lower conveyance path 53. This is a position where the roller 56b corresponds to the contact portion 23c1 of the loading platform 23 when the front portion of the sequential carriage 2 is brought into contact with the transport path portion 5. The other end of the fifth wire 52c is fixed to the upper part of the center of the rod-shaped part 56a in the front-rear direction. In a normal state, the rod-like portion 56a is rotated counterclockwise in FIG. 5 by its own weight, and is not rotated with respect to the frame 10 by a stopper (not shown). At this time, the slide part 52a of the upper holding part 52 is pulled and positioned by the fifth wire 52c. In this state, when the forward box 4A is moved by its own weight from the loading platform 23 of the forward carriage 2 to the upper conveyance path 51, the front end of the sequential box 4A comes into contact with the slide portion 52a of the upper holding portion 52 and moves forward. Accordingly, the fifth wire 52c is pulled, so that the rod-shaped portion 56a is rotated upward.

  As shown in FIGS. 5 and 6, one engaging lever 57 is a plate-like member extending in the front-rear direction, and is disposed at the center in the left-right direction of the lower horizontal frame 18. An engaging portion 57a is provided at the rear end portion of the engaging lever 57 in the downward direction, and is pivotally supported by the lower horizontal frame 18 so as to be vertically rotatable in the vicinity of the front end portion. One end of a seventh wire 57b is fixed to the rear upper surface of the engagement lever 57. The other end of the seventh wire 57b is fixed pulleys 57c and 57d fixed to the lower horizontal frame 18, a fixed pulley 57e fixed to the lower right side of the right upper frame 11, a fixed pulley 57f, and the first weight portion 42. Are fixed to the fourth weight portion 57g via the insertion holes 42c in this order. The fourth weight portion 57g does not have a weight enough to overcome the force that the engagement lever 57 tries to rotate counterclockwise in FIG. 5 due to its own weight and rotate the engagement lever 57 clockwise. . As a result, when the engagement lever 57 is not pulled by the seventh wire 57b, the engagement lever 57 is urged counterclockwise in FIG. 5 by its own weight and is prevented from rotating by a stopper (not shown). Is retained. In this state, when the first weight portion 42 on the left side is raised, the other end portion of the seventh wire 57b is held in a state of being pulled downward by the fourth weight portion 57g through the insertion hole 42c of the first weight portion 42. Therefore, this state is maintained without applying any force to the seventh wire 57b. On the other hand, in the state where the first weight portion 42 on the left side is lowered, that is, in the normal state, the upper surface portion of the fourth weight portion 57g comes into contact with the lower peripheral edge of the insertion hole 42c and is pushed down to pull the seventh wire 57b. The engagement lever 57 is in a state of being rotated clockwise. When the front part of the carriage 2 is pressed against the conveyance path part 5, the first weight part 42 on the left side rises and is urged counterclockwise in FIG. 5 by its own weight to stop (not shown) Is held in a state where the rotation is stopped. Then, the lower surface of the rear end of the engagement portion 57a of the engagement lever 57 contacts the center of the front portion of the lower frame 21b of the sequential carriage 2 and is rotated clockwise in FIG. After getting over the front part, it turns counterclockwise and engages to hold the erection carriage 2 so as not to be retracted. When the first weight part 42 on the left side descends from this state and pulls the seventh wire 57b, the engaging lever 57 rotates clockwise to release the engagement.

  As shown in FIGS. 5 and 6, the second weight portion 58 is attached to the additional upper and lower frame 17 c so as to be slidable in the vertical direction. The other end portion of the sixth wire 43d having one end portion fixed to the second slide portion 43 is connected to the second weight portion via a fixed pulley 43e and a fixed pulley 58a fixed to the lower left side of the lower vertical frame 16 on the right side. The upper surface of 58 is fixed. Accordingly, when the second slide part 43 moves forward, the second weight part 58 rises, and when the second slide part 43 moves backward, the second weight part 58 descends. When the forward cart 2 is pushed into the cart pushing portion 4 so as to press the front portion of the forward cart 2 against the transport path portion 5, the upper part of the front frame 21c on the right side of the forward cart 2 is the second slide portion. The second slide part 43 is moved forward in contact with the contact part 43c of 43. As a result, the second weight part 58 rises, and a force that pushes the forward carriage 2 backward via the second slide part 43 is generated by the weight of the second weight part 58. In normal times, the second weight portion 58 is located at the lower end of the vertical sliding range.

(Operation of box exchange device 1)
The box exchanging device 1 passes the ordering box 4A placed on the ordering carriage 2 to the station 3, and the ordering cart 2 receives the empty box 4B placed on the station 3 by the ordering carriage 2. explain.

<Initial state of order cart 2>
As shown in FIGS. 2 and 3, in the initial state in which the cart 2 is replaced, the carriage 2 is positioned at the upper end and the descent is stopped by the stopper 24. And the loading platform 23 is arrange | positioned so that it may become a downward slope toward the upper horizontal frame 22a of the loading platform frame 22, and each of the rear part of two outer roller conveyors 23b may be in the loading platform support part 22g1 of the loading platform frame 22. The rotation is stopped by contact. In this state, two ordering boxes 4A are placed side by side on the loading platform 23, and the rear end of the ordering box 4A abuts against the upper horizontal frame 22a to stop the movement. The slide lock 25, the projecting pin 26, and the detection lever 27 are respectively located at the above-described normal positions.

<Initial state of station 3>
As shown in FIGS. 5 and 6, in the initial state where the box 3 is replaced, the station 3 has two empty boxes 4B collected from the product assembly line placed side by side on the lower conveyance path 53 side by side. The upper end portion of the upper arm portion 54a1 of the holding portion 54 is held so as not to move rearward with the rear end portion of the empty box 4B in contact with the upper end portion. The first slide part 41, the first weight part 42, the second slide part 43, the second weight part 58, the upper holding part 52, the pressing lever 56, and the engaging lever 57 are located at the aforementioned normal positions, respectively. Yes.

<First step>
As shown in FIG. 7, the operator grasps the handle 21 e of the initial cart 2 and pushes the front of the cart 2 toward the station 3 into the cart pusher 4 of the initial station 3. Then, as indicated by a two-dot chain line, the pin portion 26b of the projecting pin 26 of the sequential carriage 2 comes into contact with the contact portion 41c of the first slide portion 41 of the station 3. When the cart 2 is further pushed forward from this state, the first slide portion 41 is moved forward along with it, and the first weight portion 42 is pulled up by the pulling of the fourth wire 41d and is shown by a solid line. It becomes a state. In this intermediate stage, as shown by a two-dot chain line, the contact portion 43c of the second slide portion 43 contacts the upper portion of the front frame 21 of the upright carriage 2. When the cart 2 is further pushed forward from this state, the second slide portion 43 is moved forward along with this, and the second weight portion 58 is pulled up by the pulling of the sixth wire 43d and is shown by a solid line. It becomes a state. The operator pushes the cart 2 against the push-back force against the pushing force caused by the weight of the first weight portion 42 and the second weight portion 58 applied through the first slide portion 41 and the second slide portion 43. Will be pushed into. At this time, as the first weight part 42 on the left side rises, the downward pressing of the fourth weight part 57g by the first weight part 42 on the left side is released, and the engagement lever 57 is counteracted in FIG. It is urged clockwise and held in a state where its rotation is stopped by a stopper (not shown).

<Second step>
As shown in FIG. 8, when the operator further pushes the propulsion cart 2 toward the conveyance path portion 5 of the station 3, the lower arm portion 23 c of the loading platform 23 of the propulsion cart 2 as indicated by a two-dot chain line. The abutting portion 23 c 1 abuts on the roller 56 b of the pressing lever 56 of the transport path portion 5. When the forward cart 2 is further pushed forward from this state, the lower arm portion 23c rotates clockwise in FIG. 8 around the rotation shaft 23a and the loading platform 23 is indicated by a solid line. Become. That is, the four roller conveyors 23b are linearly continuous in the front-rear direction with the four roller conveyors 51a in the upper conveyance path 51 of the conveyance path unit 5. At this time, the engaging portion 23c2 of the lower arm portion 23c rotates the lock lever 25a of the slide lock 25 counterclockwise in FIG. 8 around the rotation shaft 25a4 and also engages with the notch 25a3. The state is returned to a state indicated by a solid line. Further, at this time, the engagement lever 57 of the conveyance path portion 5 has a rear end portion of the engagement portion 57a of the engagement lever 57 at the center in the left-right direction of the front portion of the lower frame 21b of the sequential carriage 2 as indicated by a two-dot chain line. The lower surface comes into contact and is rotated in the clockwise direction in FIG. 8 to get over the front portion of the lower frame 21b, and then is rotated and engaged counterclockwise to be in a state indicated by a solid line. In this state, the order cart 2 is held so as not to be retractable with respect to the conveyance path portion 5 and does not move backward even if the operator releases his hand from the handle portion 21e.

<Third step>
As shown in FIG. 9, the two ordering boxes 4A on the loading platform 23 of the ordering carriage 2 are moved toward the front and lower side by their own weight and are placed on the upper conveyance path 51, and the front end portion thereof is the upper holding portion. 52 is in contact with the slide frame 52a1 of the slide portion 52a. Then, the slide frame 52a1 is pushed forward by the standing box 4A and moves forward to pull the pressing lever 56 via the fifth wire 52c. The pressing lever 56 rotates clockwise in FIG. 9 and is indicated by a two-dot chain line. The state is changed to a state indicated by a solid line. Thus, the contact between the roller 56b of the pressing lever 56 and the contact portion 23c1 of the lower arm portion 23c of the loading platform 23 is released, and the lower arm portion 23c rotates counterclockwise in FIG. 9 about the rotation shaft 23a. To do. Since the notch portion 25a3 of the slide lock 25 is engaged with the engaging portion 23c2 by the rotation of the lower arm portion 23c, the slide lock 25 is moved forward and the upper bar of the stopper 24 via the second wire 24e. The part 24a is rotated to release the holding of the loading frame 22 on the carriage frame 21, and the loading frame 22 is lowered together with the loading platform 23 to be in a state indicated by a solid line. As the load carrier frame 22 is lowered, the notch 25a3 of the slide lock 25 and the engagement portion 23c2 of the lower arm portion 23c of the load carrier 23 are disengaged. The wire 24e is pulled to move to the normal position.

<4th step>
As shown in FIG. 10, the loading platform frame 22 and the loading platform 23 of the step-up carriage 2 are lowered and moved to the lower end, and come into contact with a stopper (not shown) disposed on the carriage frame 21 and stop. At this time, the four roller conveyors 23b of the sequential carriage 2 are linearly continuous with the four roller conveyors 53a of the lower conveyance path 53 of the conveyance path portion 5 in the front-rear direction. In the process in which the loading frame 22 and the loading platform 23 descend, the forearm portion 23d of the loading platform 23 abuts against the cushioning material 54a21 of the lower holding portion 54 of the conveyance path portion 5, and the lower holding portion 54 is urged by the elastic member 54c. Move it down. Accordingly, the upper end portion of the upper arm portion 54a1 is retracted downward from the upper surface portion of the roller conveyor 53a of the lower conveyance path 53, and the holding of the empty box 4B held on the lower conveyance path 53 is released. Then, the two empty boxes 4B on the lower conveyance path 53 of the conveyance path unit 5 move rearward and downward due to their own weight and rest on the loading platform 23 of the step-up carriage 2, and the rear end of the detection lever 27 The detection lever 27 is rotated counterclockwise in FIG. 10 in contact with the upper arm portion 27b. When the detection lever 27 rotates counterclockwise, the pin portion 26b of the projecting pin 26 is pulled downward via the third wire 26c, and then retracts into the cylindrical portion 26a. As a result, the contact between the pin portion 26b and the contact portion 41c of the first slide portion 41 is released, and the first slide portion 41 moves rearward. Accordingly, the traction of the fourth wire 41d is loosened, and the first slide portion 41 is pulled. The weight 42 can be lowered.

<5th step>
As shown in FIG. 11, when the first weight portion 42 is lowered, the upper surface portion of the portion protruding outward from the gap portion 21h at the left and right end portions of the upper and lower slide bars 22h of the upright carriage 2 is applied to the lower end surface thereof. Pressed down in contact. Along with this, the loading frame 22 is pulled up together with the loading platform 23 on which the empty box 4B is placed by pulling the first wire 22i. When the loading frame 22 rises from below, as shown in FIG. 4, the vertical frame 22d of the loading frame 22 is held between the roller 24a1 and the upper bar portion 24a, and the falling of the loading frame 22 is stopped. It will be in the state. Further, the detection lever 27 returns to the normal state by the urging force, and accordingly, the pulling of the third wire 26c is released, and the pin portion 26b of the protruding pin 26 returns to the normal protruding state. When the left first weight portion 42 is lowered, the upper surface portion of the fourth weight portion 57g comes into contact with the peripheral edge of the lower opening of the insertion hole 42c and is pushed down, pulling the seventh wire 57b and pulling the engagement lever 57 clockwise. Rotate around. As a result, the engagement between the conveying path 5 and the stepped carriage 2 by the engagement lever 57 is released, and the ordering carriage 2 can move rearward away from the conveying path 5.

<6th step>
As shown in FIG. 12, the carriage 2 with the empty box 4 </ b> B placed on the loading platform 23 and the loading platform frame 22 positioned at the upper end is pushed by the contact portion 43 c of the second slide portion 43, so that the conveyance path is reached. It moves away from the part 5 and moves backward. By this movement, the operator recognizes that the ordering box 4A and the empty box 4B have been exchanged, and easily removes the ordering carriage 2 from the carriage pushing portion 4. After that, the worker moves the order cart 2 to a place where the predetermined order work is performed, puts the ordered parts in the empty box 4B, returns to the station 3, and repeats the operation from the first step.

  In the box exchange operation, the operator can exchange the standing box and the empty box with a simple operation that does not require bending and stretching the waist. Further, this operation can be performed only by a mechanical action without using power means such as air or electricity.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, in the above embodiment, the station 3 is placed on the side of the product assembly line, and the upright box 4A is directly supplied from the station 3 to the line. However, the present invention is not limited to this, and the station 3 may be placed at a location away from the product assembly line and conveyed from the station 3 to the line using an automated guided vehicle (AGV).

DESCRIPTION OF SYMBOLS 1 Box changer 2 Order cart 3 Station 4 Cart pushing part 4A Order box 4B Empty box 5 Carriage path part 21 Cart frame 22 Cargo frame 22h Vertical slide bar (pressing part)
22i 1st wire 23 Loading platform 23c Lower arm part (downward extension part)
24 Stopper 24e Second wire 25 Slide lock 26 Projection pin 26c Third wire 27 Detection lever 41 First slide portion 41d Fourth wire 42 First weight portion 43 Second slide portion 43d Sixth wire 51 Upper transport path 52 Upper holding portion 52c 5th wire 53 Lower conveyance path 54 Lower holding part 56 Pressing lever 57 Engaging lever 57b 7th wire 58 2nd weight part F Floor

Claims (3)

A box exchanging device for exchanging the ordering box and the empty box between the station and the ordering carriage brought into contact with the station,
The order cart is
A dolly frame;
It is attached to the carriage frame in a state where it is connected to the push-down portion with the first wire, and when the push-down portion is pushed down, it moves up and moves to the raised position, and when the load pushing down the push-down portion is released, it is lowered. A load carrier frame arranged to move to a lowered position;
A stopper that holds the load carrier frame so as not to be lowered with respect to the carriage frame at the raised position;
The station that is attached to the cargo bed frame so as to be tiltable, can be placed on the standing box or the empty box, and is in contact with an inclined posture that is inclined downward toward the station on which the ordering carriage is in contact. And a reverse inclined posture that is downwardly inclined toward the opposite side, and a downward extending portion that extends downward is provided, and the downward extending portion is tilted to be inclined by pressing the downward extending portion. A loading platform configured to take,
When connected to the stopper and the second wire, when the loading platform is in the inclined posture, it engages with a part of the downward extending portion and is pulled by the downward extending portion when the loading platform returns to the reverse inclined posture. A slide lock that slides and pulls the second wire to release the stopper and then releases the engagement with a part of the downwardly extending portion;
A protruding pin that is movable and protruded between the protruding state and the buried state of the carriage frame; and
When the loading frame is in the lowered position, the protruding pin is connected to the protruding pin, protrudes on the loading platform, tilts by the contact of the empty box, and pulls the third wire to bury the protruding pin. The detection lever
With
The station
A carriage pushing portion and a conveyance path portion adjacent to the carriage pushing portion;
The cart pushing portion is
A first slide part that abuts against the protruding pin and slides in the direction of pushing the carriage when the standing carriage is pushed;
A first weight portion connected to the first slide portion by a fourth wire and pulled up by the fourth wire by the slide of the first slide portion;
The conveyance path section is
An upper conveying path for sending the descending gradient of the upright box toward the opposite side from the carriage pushing portion side by its own weight;
An upper holding portion that is disposed on the opposite side of the carriage pushing portion of the upper conveyance path and holds the standing box;
A lower conveyance path that is disposed below the upper conveyance path and sends the empty box having a downward gradient toward the cart pushing portion side in its downward direction by its own weight;
A lower holding part that is disposed on the carriage pushing part side of the lower conveyance path and holds the empty box;
When the trolley is pushed into the carriage push-in part, the push is disposed so as to be able to swing between a position that abuts against the downward extension part and presses the downward extension part and a position that does not press the downward extension part. A lever, and
The upper holding portion is disposed so as to be movable toward the side opposite to the cart pushing portion, and is connected to the pressing lever by a fifth wire, and moves when the standing box abuts on the upper holding portion. Then, it is configured to swing the pressing lever to a position where it is not pressed by pulling the fifth wire,
When the load carrier frame or the load carrier that descends to the lower holding portion comes into contact, the lower holding portion is configured to retreat from the lower conveyance path and release the holding of the empty box,
When the forward cart is pushed into the cart pushing portion in a state where the sequential cart is placed on the cargo bed of the sequential cart, the projecting pin comes into contact with the first slide portion and the first slide. The part slides to raise the first weight part,
The lower extension part comes into contact with the pressing lever, and the loading platform is in the inclined posture, and the order box is sent out to the upper conveyance path, and the order box comes into contact with the upper holding part and the upper holding part. Is moved to a position where the pressing lever is not pressed, the contact of the downwardly extending portion with the pressing lever is released, and the cargo bed returns to the reverse inclined posture,
When the slide lock is slid and the stopper is released, the cargo bed frame descends and comes into contact with the lower holding portion to release the holding of the empty box, and the empty box is sent out from the lower conveyance path to the loading bed and the detection is performed. Tilt the lever so that the protruding pin is buried,
The engagement between the projecting pin and the first slide part is disengaged, the first weight part is lowered, and the first weight part pushes down the push-down part to place the loading platform on which the empty box is placed at the raised position. A box changer configured to be moved. In claim 1,
The cart pushing portion is
A second slide portion that contacts the carriage frame and slides in the carriage push-in direction when the forward carriage is pushed in;
The carriage pushing portion or the transport path portion is connected to the second slide portion by a sixth wire, and is pulled by the sixth wire by the slide of the second slide portion, and a second weight portion to be pulled up,
The trolley is pushed into the cart push-in portion, the downwardly extending portion abuts against the pressing lever, and the cargo bed is in the inclined posture to engage with the cart frame and the cart frame An engagement lever that prevents withdrawal from the cart push-in portion,
The engagement lever is connected to the first weight portion by a seventh wire, and is configured to release the engagement with the carriage frame by pulling the seventh wire when the first weight portion is lowered. Box changer. In claim 1 or claim 2,
A pair of left and right projecting pins of the trolley are provided,
The box exchanging device in which the first slide part and the first weight part of the station are provided in a pair on the left and right.

Images