JP2021059441A - Lifter device - Google Patents

Abstract

To provide a lifter device capable of miniaturizing the device itself and lowering a floor while reducing a load on a driving unit at the time of starting a cross link.SOLUTION: The lifter device comprises: a lifting mechanism 50 including a slide member 51 connected to left and right cross links 31, 31 and slid with respect to a base 13 to raise the cross links 31, 31 with a conveyed article support base 20 supported so as to be liftable by rising of the left and right cross links 31, 31; connection parts 52 which are movable with the slide member 51, and provided to the slide member 51; and a follower rollers 23 which are pushed up by the connection parts 52 when the connection parts 52 move, and provided to the conveyed article support base 20.SELECTED DRAWING: Figure 1

Description

The present invention provides a slide member in which a support base for an object to be transported is supported so as to be raised and lowered by the undulations of a pair of left and right cross links, connected to the cross links, and slid with respect to the base to raise and lower the cross links. It is related to a lifter device provided with an elevating mechanism provided.

As a lifter device of this type, as described in Patent Document 1, a cam mechanism that pushes up an arm member constituting a link to perform an initial ascending operation of a pantograph, and a support of one of the pantographs following the initial ascending. A lifter device including an actuator that moves a point toward the other support point to raise the pantograph is known.
In the lifter device, the cam mechanism is composed of a cam and a roller, and the pantograph is raised by the cooperation of the cam and the roller to reduce the load on the drive unit when the pantograph is started.
In the lifter device, the cam is fixed to the arm member of the pantograph, and the arm member is pushed up by moving the roller that cooperates with the cam. Alternatively, a roller in contact with the cam is fixed to the arm member of the pantograph, and the arm member is pushed up by moving the cam.

Japanese Patent Application Laid-Open No. 7-187587

In the conventionally well-known lifter device described in Patent Document 1, the loading platform is lowered without interfering with the arm member of the pantograph that moves in and out and the cam or roller fixed to the arm member and the base. In order to be lowered to the position, the cam and the roller are fixed to the arm member and the base of the pantograph so as to be outside the loading platform in the plan view of the loading platform lowered to the lowering limit position. That is, the cam and the roller are arranged outside the loading platform in a plan view of the loading platform that has been lowered to the lowering limit position. Therefore, there is a problem that the lifter device itself becomes larger in the outward direction in the plan view of the loading platform that has been lowered to the lowering limit position. Further, since the cam and the roller act from the outside of the link of the pantograph structure, there is a problem that a force in the horizontal direction different from the elevating direction is applied to the pantograph portion and the stability is impaired.
If the cam and roller are placed inside the loading platform in a plan view of the loading platform lowered to the lowering limit position, the cam or roller interferes with the contracting pantograph arm member when the loading platform is lowered. , The loading platform cannot be lowered to the lowering limit position. Therefore, although it is possible to reduce the size of the lifter device itself, it hinders the lowering of the floor of the lifter device.

An object of the present invention is to provide a lifter device capable of solving the above-mentioned conventional problems, and the means thereof will be indicated by reference numerals according to the embodiments described later. In the configuration according to claim 1, the object to be transported support 20 is supported so as to be able to move up and down by the undulations of a pair of left and right cross links 31, is connected to the cross link 31, and slides with respect to the base 13. An elevating mechanism 50 provided with a slide member 51 for raising and lowering the cross link 31 is provided, and an elevating cam member 52 movable together with the slide member 51 is provided on the slide member 51, and the elevating cam member 52 is provided. A driven roller 23 that is pushed up by the elevating cam member 52 when moving is provided on the object to be transported support 20.

Regarding the implementation of the present invention having the above configuration, as described in claim 2, the slide member 51 slides with respect to the base 13 from the end of the cross link 31 in the lower limit position. The elevating cam member 52 pushes up the object to be transported support 20 in the upright direction of the cross link 31 via the driven roller 23, and then the slide member 51 pushes the cross link 31 to push the cross link 31. Is further pushed up in the upright direction, and the push-up of the object to be transported support 20 by the elevating cam member 52 is released.

Further, as shown in claim 3, in the slide member 51, a support shaft 41 connected to one end side of one link 34 constituting the cross link 31 can move in the slide moving direction of the slide member 51. A play space is formed.

According to the lifter device having the above configuration, since the driven roller that is pushed up by the movable elevating cam member together with the slide member that raises and lowers the cross link is provided on the object to be transported support, the elevating cam member and the driven roller are provided. It can be placed below the object to be transported support that has descended to the descending limit position without interfering with the undulating cross-link. Therefore, the lifter device itself can be miniaturized and the floor of the lifter device can be lowered while reducing the load on the drive unit at the start of the cross link by raising the object to be transported support by the elevating cam member. It can be performed.

It is a front view of the transport carriage which is an example of the lifter device which concerns on this invention. It is a top view of the transport carriage which is an example of the lifter device which concerns on this invention. It is a perspective view of the slide member of the transport carriage which is an example of the lifter device which concerns on this invention. It is a front surface which shows the ascending operation of the object to be conveyed support | carriage in the transport carriage which is an example of the lifter device which concerns on this invention. It is a front view which shows the ascending operation of the object to be conveyed support | carriage in the transport carriage which is another Example of the lifter device which concerns on this invention.

A specific embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 4, the transport carriage 10 which is an example of the lifter device of the present invention has a pair of left and right wheels 11 which roll on a pair of left and right guide rails 90 laid along the transport path. Prepare and transport along a constant transport route. The driving means of the transport trolley 10 is not particularly limited, but for example, a plurality of feed lines (not shown) provided on the side of the rail 90 and slides on the feed line provided on the transport trolley 10. It is mainly composed of a current collector unit (not shown) in contact with the current collector, and drives the transport trolley 10 by supplying electric power from the feeder line via the current collector unit.

The base 13 on the transport carriage 10 is provided with an object support base 20 supported at a substantially central position thereof via a cross-link mechanism 30 so as to be able to move up and down. As shown in FIGS. 1 and 2, the cross link mechanism 30 has two cross links 31 and 31 horizontally parallel to the transport direction S of the transport carriage 10 on both the lower left and right sides of the object support base 20. It is configured by arranging them in parallel.

The pair of left and right cross links 31 and 31 are composed of two links 33 and 34 whose central crossovers are pivotally attached to each other by a central fulcrum axis 32 concentric with each other. Of the links 33 and 34, the front end portion of the outer link 33 provided in the outer direction of the transport carriage 10 is located on a pair of left and right base side bearing members 35 provided on the support frame 14 on the front side of the transport carriage 10. The fixed fulcrum shaft 36 is pivotally attached so as to swing up and down. Further, the rear ends of the pair of left and right outer links 33 are connected to each other by a support frame 37 on the support base side. Further, a slide shaft 38 is fixed to the rear end portion of the outer link 33, and a roller 39 is rotatably supported at one end by the slide shaft 38. Further, the rollers 39 are fitted to the pair of left and right support base side slide guides 21 provided on the lower side of the rear end portion of the object to be transported support 20 so as to be rollable in the front-rear direction.
The support base side slide guide 21 is composed of a member that projects downward along the longitudinal direction of the object support base 20 (the front-rear direction of the transport carriage 10), and a hole portion in which the roller 39 is fitted in the side surface portion thereof. Is formed. The support base side slide guides 21 are the rear end portions of the object to be transported support base 20, and are provided on both end sides of the object to be transported support base 20 in the width direction (the left-right direction of the transport carriage 10).

Of the links 33, 34, the front end portions of the pair of left and right inner links 34, 34 provided in the inner direction of the transport carriage 10 are concentrically positioned on the fixed fulcrum shaft 40 below the front end portion of the object to be transported support 20. Each is supported. The fixed position support shaft 40 is pivotally attached to a pair of left and right support base side bearing members 22 provided at positions directly above the pair of left and right base side bearing members 35 so as to swing up and down. Further, the rear end portion of the inner link 34 is fixed to the base side slide support shaft 41. A roller 42 is rotatably supported on the base side slide support shaft 41. The roller 42 is rotatably fitted in the base-side slide guide 57 formed in the connecting portion 52 of the slide member, which will be described later, in the front-rear direction.

As shown in FIG. 4, the pair of left and right cross links 31, 31 are raised and lowered by the drive of the elevating mechanism 50, so that the object to be transported support 20 is moved to the lowering limit position shown in FIG. 4A and FIG. 4 (A). Move up and down to and from the ascending limit position shown in e).
The elevating mechanism 50 slides the slide member 51 connecting the pair of left and right cross links 31 and 31 in the horizontal direction with respect to the base 13, so that the pair of left and right cross links 31 and 31 are undulated in a synchronized state. Let me.
As shown in FIGS. 1 to 3, the slide member 51 includes a pair of left and right elongated connecting portions 52 and 52 arranged on both left and right sides along the front-rear direction of the transport carriage 10, and a pair of left and right elongated connecting portions 52 and 52. It is formed of a connecting portion 53 erected between the connecting portions 52 and 52, and a substantially H-shaped member in a plan view. The slide member 51 is directly below the object to be transported support 20 and is provided between the pair of left and right cross links 31, 31. The slide member 51 is configured to be guided by guides 15 and 16 extending in the front-rear direction of the transport carriage 10 on the support frame 14. Specifically, the connecting portions 52, 52 of the slide member 51 are guided by the guide 15. Further, the connecting portion 53 of the slide member 51 is guided by the guide 16 in the groove portions 53a and 53a formed below the connecting portion 53.
A screw 54 of a ball screw mechanism extending horizontally in the front-rear direction of the transport carriage 10 is screwed into the connecting portion 53 of the slide member 51. A motor 55 is provided on the screw 54 of the ball screw mechanism. The motor 55 rotationally drives the screw 54 of the ball screw mechanism in the forward or reverse direction to reciprocate the slide member 51 horizontally in the front-rear direction of the transport carriage 10.

The pair of left and right connecting portions 52, 52 of the slide member 51 are elevating cam members for pushing up the object to be transported support base 20 via the driven roller 23. At the front end portions of the pair of left and right connecting portions 52, 52, an inclined portion 52A that inclines upward from the front side to the rear side of the transport carriage 10 is formed. A plate member 56 forming a cam surface of the elevating cam member is fixed to the upper surface of the inclined portion 52A of the connecting portion 52. That is, the cam surface of the elevating cam member is formed so as to be inclined at a predetermined angle with respect to the base 13.
In the elevating cam member by the connecting portion 52, the connecting portion 52 moves due to the movement of the slide member 51, so that the plate member 56 and the driven roller 23 provided on the object to be transported support 20 come into contact with each other. Further, as the connecting portion 52 moves, the driven roller 23 is pushed upward along the inclined portion 52A while being in contact with the plate member 56.

The driven roller 23 is pivotally supported by a roller receiver 24 provided so as to project downward at the rear end of the object to be transported support 20. The roller receivers 24 are provided on both the left and right sides of the object to be transported support 20, respectively, and are inside the support base side slide guide 21 (center side in the width direction of the object to be transported support 20), and the support base side slide guide 21. It is provided in parallel with.
The driven roller 23 receives the roller so that when the object to be transported support 20 descends to the lowering limit position shown in FIG. 4A, the driven roller 23 is arranged in front of the inclined portion 52A of the connecting portion 52 of the slide member 51. It projects downward from the body 24 and is pivotally supported.
By providing the roller receiver 24 and the driven roller 23 in this way, the driven roller 23 is inside the pair of left and right cross links 31 and 31 (inner link 34 and outer link 33) (width of the object to be transported support 20). (Center side in the direction), and when the object to be transported support 20 descends to the descending limit position shown in FIG. 4A, the position is set so as not to interfere with the pair of left and right cross links 31, 31.

A base-side slide guide 57 is provided at the connecting portion 52 of the slide member 51. The base-side slide guide 57 rotatably guides the roller 42 supported by the base-side slide support shaft 41 connected to the rear end of the inner link 34 of the pair of left and right cross links 31 and 31. The base side slide guide 57 is an elongated hole formed on the side portion of the connecting portion 52, and the elongated hole portion extends in the front-rear direction of the transport carriage 10. The base side slide guide 57 has a roller 42 fitted in the elongated hole portion thereof, and guides the roller 42 in the front-rear direction of the transport carriage 10. The length of the elongated hole portion of the slide guide 57 on the base side is set by the length of the inclined portion 52A of the connecting portion 52 of the slide member 51 and the angle with respect to the base 13. By making the base side slide guide 57 into which the rollers 42 are fitted a long hole extending in the front-rear direction of the transport carriage 10, the base side slide support shaft 41 connected to the inner link 34 is a slide member. The slide member 51 is formed with a play space that allows the 51 to move in the slide moving direction (the front-rear direction of the transport carriage 10).

Next, the ascending operation of the object to be transported support base 20 in the transport carriage 10 will be described with reference to FIGS. 1 to 4.
As shown in FIG. 4A, in a state where the object to be transported support 20 is lowered to the lowering limit position, the motor 55 of the elevating mechanism 50 is driven to rotate the screw 54 of the ball screw mechanism to slide the slide. The member 51 slides horizontally in the front direction of the transport carriage 10. At this time, as shown in FIGS. 3 and 4B, the connecting portion 52 of the slide member 51 connects the driven roller 23 provided on the object to be transported support 20 from the front end position of the connecting portion 52 to the connecting portion 52. The inclined portion 52A is pushed upward while being in contact with the plate member 56 so as to be climbed. When the driven roller 23 is pushed up by the connecting portion 52, the object to be transported support base 20 that supports the driven roller 23 is pushed upward. That is, the object to be transported support base 20 is not raised by the standing of the pair of left and right cross links 31 and 31, but is raised by pushing up the driven roller 23 by the connecting portion 52. The driven roller 23 is pushed up by the connecting portion 52 to raise the transported object support base 20, so that the pair of left and right cross links 31 and 31 that support the transported object support base 20 are lifted and rise up.

Further, as shown in FIG. 4C, when the slide member 51 slides in the forward direction of the transport carriage 10, the driven roller 23 climbs up the inclined portion 52A of the connecting portion 52 and separates from the plate member 56. That is, the push-up of the driven roller 23 by the connecting portion 52 is released. At this time, the roller 42 provided at the rear end of the inner link 34 via the base-side slide support shaft 41 comes into contact with the rear end of the elongated hole portion of the base-side slide guide 57. That is, the roller 42 comes into contact with the rear end of the base side slide guide 57 at the timing when the driven roller 23 separates from the plate member 56.
As shown in FIGS. 4D and 4E, the roller 42 slides when the slide member 51 slides and moves while the roller 42 is in contact with the rear end of the base side slide guide 57. It is pushed by the connecting portion 52 of the member 51. Further, as the roller 42 is pushed, the rear end portion of the inner link 34 connected to the base side slide support shaft 41 that supports the roller 42 is pushed in the front direction of the transport carriage 10, so that a pair of left and right sides is pushed. Cross links 31 and 31 stand up and rise. As a result, the object to be transported support 20 is switched from rising due to the push-up of the driven roller 23 by the connecting portion 52 to rising due to the standing of the pair of left and right cross links 31 and 31.

As described above, in the elevating mechanism 50, in the initial stage of raising the object to be transported support 20 at the descending limit position shown in FIG. 4A to the ascending limit position shown in FIG. 4E, the connecting portion 52 is used. The object to be transported support 20 is raised by pushing up the driven roller 23, and when the object to be transported support 20 is raised by a certain height or more, a pair of left and right crosses are raised from the rise by pushing up the driven roller 23 by the connecting portion 52. The method of raising the object to be transported 20 is switched to the raising of the links 31 and 31 due to standing up. That is, the elevating mechanism 50 raises the object to be transported support 20 by the connecting portion 52 when the cross links 31 and 31 on which the load of the motor 55 is applied are started (at the start of standing up), and the other parts are cross links 31. , 31 raises the object to be transported, and the object to be transported 20 is raised by a two-step ascending method.

Here, when the object to be transported support 20 is raised by the connecting portion 52, the driven roller 23 is pushed up linearly by the connecting portion 52, so that the object to be transported is transported at the same speed as the slide member 51 that slides and moves at a constant speed. While the object support 20 can be raised, when the object support 20 is raised by the cross links 31 and 31, the object support 20 is moved with respect to the movement of the rear end of the inner link 34. Since 20 does not rise at a constant height, the object to be transported support 20 cannot be raised at the same speed as the slide member 51 that slides and moves at a constant speed. Therefore, when the cross links 31 and 31 stand up and rise when the object to be transported support 20 is raised from the connecting portion 52, the rear end portion of the inner link 34 is caught. Therefore, the roller 42 is supported by forming the hole portion of the base side slide guide 57 into which the roller 42 is fitted into an elongated hole in the front-rear direction (slide moving direction of the slide member 51) of the transport carriage 10. The slide member 51 is provided with a play space in which the base-side slide support shaft 41 can move in the slide moving direction of the slide member 51.

According to the transport carriage 10 (an example of the lifter device) having the above configuration, the driven roller 23 pushed up by the movable connecting portion 52 together with the slide member 51 that raises and lowers the cross links 31 and 31 is provided on the transported object support base 20. Therefore, the connecting portion 52 and the driven roller 23 are arranged below the transported object support base 20 that has been lowered to the lowering limit position shown in FIG. 4A without interfering with the undulating cross links 31 and 31. Can be done. Therefore, the transport trolley 10 itself can be miniaturized while reducing the load on the motor 55 at the start of the cross links 31 and 31 by raising the object to be transported support pedestal 20 by the connecting portion 52, and the transport trolley 10 itself can be miniaturized. 10 floors can be lowered.

Although the most preferable embodiment of the present invention has been described with reference to the drawings, the present invention is not limited to the specific configuration of the above embodiment. For example, as in the transport carriage 10A shown in FIG. 5, the slide member for raising and lowering the pair of left and right cross links 31 and 31 may be a slide member 60 formed by being separated into two members.
The slide member 60 is composed of two slide members, a first slide member 61 and a second slide member 62.
The first slide member 61 is screwed into the screw 54 of the ball screw mechanism, and the screw 54 of the ball screw mechanism is rotationally driven by the motor 55 along the rails 67 and 67 formed at both left and right ends of the transport carriage 10A. , The transport trolley 10A reciprocates horizontally in the front-rear direction. An inclined portion 61A is formed on the first slide member 61, and a plate member 56 is fixed to the inclined portion 61A. That is, the first slide member 61 serves as an elevating cam member for pushing up the object to be transported support 20 via the driven roller 23.
The second slide member 62 is slidably provided along the rails 67 and 67, and is pushed horizontally by the first slide member 61 to move horizontally in the front-rear direction of the transport carriage 10A. An inner link 34 is connected to the second slide member 62 via a base-side slide support shaft 41.

As shown in FIG. 5A, the first slide member 61 and the second slide member 62 are arranged apart from each other when the object to be transported support 20 is lowered to the lower limit position. At this time, the driven roller 23 provided on the object to be transported support 20 is arranged between the separated first slide member 61 and the second slide member 62.
As shown in FIG. 5B, by driving the motor 55 to rotate the screw 54 of the ball screw mechanism, the first slide member 61 slides horizontally in the forward direction of the transport carriage 10A along the rail 67. To do. At this time, the first slide member 61 pushes up the driven roller 23 provided on the object to be transported support 20 while contacting the plate member 56 so as to climb the inclined portion 61A from the front end position of the first slide member 61. .. When the driven roller 23 is pushed up by the first slide member 61, the object to be transported support base 20 that supports the driven roller 23 is pushed upward.
Further, as shown in FIGS. 5 (c) and 5 (d), the first slide member 61 slides in the forward direction of the transport carriage 10A, so that the driven roller 23 climbs up the inclined portion 61A and the plate member 56 Stay away from. That is, the push-up of the driven roller 23 by the first slide member 61 is released. At this time, the front end of the first slide member 61 comes into contact with the rear end of the second slide member 62. That is, the first slide member 61 comes into contact with the second slide member 62 at the timing when the driven roller 23 separates from the plate member 56.
As shown in FIGS. 5D and 5E, the first slide member 61 slides and moves in a state where the first slide member 61 is in contact with the second slide member 62, so that the second slide member 61 is second. The slide member 62 is pushed by the first slide member 61. Further, as the second slide member 62 is pushed, the rear end portion of the inner link 34 connected to the base side slide support shaft 41 supported by the second slide member 62 moves in the front direction of the transport carriage 10A. When pushed, a pair of left and right cross links 31, 31 stand up and rise. As a result, the object to be transported support 20 is switched from ascending by pushing up the driven roller 23 by the first slide member 61 to ascending by standing up of the pair of left and right cross links 31, 31.

Further, in the transport carriage 10 of the above embodiment, the driving means thereof includes a plurality of feed lines provided on the side of the rail 90 and a current collecting unit provided on the transport carriage 10 and in sliding contact with the feed lines. Although it is mainly configured, the present invention is not limited to the transport carriage 10 (lifter device) provided with such a drive means, and is a straight line parallel to the traveling direction (front-back direction) of the transport carriage 10. Friction drive provided with friction drive wheels (not shown) that press-contact the left and right side surfaces 12 (see FIGS. 1 and 2) to sandwich the transport carriage 10 from both left and right sides, and a motor that rotationally drives the friction drive wheels. It may be a transport carriage (lifter device) including a means (not shown) and a drive means composed of the means (not shown).

10 Transport trolley (lifter device)
13 Base 20 Support for the object to be transported 23 Driven roller 31 Cross link 50 Elevating mechanism 51 Slide member 52 Connecting part (Elevating cam member)

Claims (3)

An elevating mechanism including a slide member that supports the object to be transported by undulating a pair of left and right cross links so as to be able to move up and down, is connected to the cross link, and slides with respect to the base to raise and lower the cross link. Is provided, an elevating cam member that can move together with the slide member is provided on the slide member, and a driven roller that is pushed up by the elevating cam member when the elevating cam member moves is a driven roller that is pushed up by the elevating cam member. A lifter device characterized in that it is provided in. When the slide member slides with respect to the base, the elevating cam member connects the transported object support base to the cross link from the end of the cross link at the lowering limit position via the driven roller. Then, the slide member pushes the cross link to further push up the cross link in the upright direction, and the lifting cam member releases the push up of the object to be transported. The lifter device according to claim 1. Claim 1 is characterized in that the slide member is formed with a play space in which a support shaft connected to one end side of one of the links constituting the cross link can move in the slide moving direction of the slide member. Alternatively, the lifter device according to claim 2.

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