JPH0616395A - Elevator stand horizontally holding device - Google Patents

Abstract

PURPOSE:To provide an elevator stand horizontally holding device having its structure simplified, its cost lowered, and suitable for also a large-sized elevator stand. CONSTITUTION:Respective peripheral portion holding mechanism for holding three sides of an elevator stand 11 approximately formed into a quadrangle shape are provided with a pair of pulley supporting shafts 31, 32 provided on both ends of each side of the elevator stand 11, first pulleys 34a, 35a attached to both shafts 31, 32, and second pulleys 34b, 35b attached to the shafts 31, 32 closer to the elevator stand 11 that the both pulleys 34a, 35a. Moreover, it is provided with a first wire 36 hung from the vicinity of the upper end of a left side stay 10a to the vicinity of the lower end of a right side stay 10a, and on the way wound around the lower part of one side first pulley 34a and the upper part of the other side first pulley 35a and a second wire 37 hung from the vicinity of the lower end of the left side stay 10a to the vicinity of the upper end of the right side stay 10a, and on the way wound the upper part of one side second pulley 34b and the lower part of the other side second pulley 35b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal holding device for a lift, and more particularly to a horizontal holding device for a lift equipped with a wire holding mechanism.

[0002]

2. Description of the Related Art Conventionally, as a horizontal holding device for this type of lifting table, there is one provided in an optical molding system for molding a solid by, for example, laminating and curing a photo-curing resin. This device raises and lowers a modeling shelf, which is an elevating table, in order to sequentially stack the cured layers of the photo-curing resin, and guides the modeling shelf by a guide shaft so that it can be moved up and down. A ball screw mechanism or the like is used to move up and down.

[0003]

However, in such a conventional horizontal holding device for a lifting table, particularly when the modeling shelf (elevating table) becomes large, one of the modeling racks is It was not easy to keep this shelf horizontal while driving the part up and down. That is, the guide mechanism such as the guide shaft plays a role of stopping the elevator table from rotating when the elevator table is moved up and down by the ball screw mechanism, but restricts a slight inclination of the elevator table at a part engaged with the elevator table. You can't do it. Also, since only the ball screw mechanism holds the lifting table at a fixed position, the lifting table is easily tilted due to the deviation of the center of gravity of the shaped object loaded on the lifting table or an external force, especially when the lifting table is large. This becomes remarkable.

On the other hand, it is conceivable to add a part for holding the lifting platform horizontally, but if a linear guide mechanism is added, it is necessary to increase many members including its driving means, which complicates the structure. And high cost will be brought. It is therefore an object of the present invention to provide a completely novel horizontal holding device for a lift, which has a simple structure and is low in cost, and is suitable for a large lift.

[0005]

In order to achieve the above object, in a horizontal holding device for an elevator according to a first aspect of the present invention, a peripheral part holding mechanism for holding at least three sides of a substantially rectangular elevator 11 is provided. As shown in the principle diagram thereof in FIG. 1, a pair of pulley support shafts 31, which are provided so as to project from the lift table 11 in parallel in the horizontal direction at both ends of each side of the lift table 11,
32, and a pair of first 1 mounted on both pulley support shafts 31, 32
Pulleys 34a, 34b, a pair of second pulleys 35a, 35b attached to both pulley support shafts 31, 32 so as to be closer to the lift 11 than the first pulleys 34a, 34b, and a column on one end side of each side. 10a
From the vicinity of the upper end to the vicinity of the lower end of the column 10a on the other end side of each side, and in the middle of that, it is wound around the lower part of the first pulley 34a on the one end side and the upper part of the first pulley 35a on the other end side. The first wire 36 and the column 10a at one end of each side
From the vicinity of the lower end of each side to the vicinity of the upper end of the column 10a on the other end of each side, and on the way, it is wound around the upper part of the second pulley 34b on the one end side and the lower part of the second pulley 35b on the other end side. And the second wire 37 is provided, and the first wire 36 and the second wire 37 have a predetermined tensile strength capable of preventing the inclination of the lift 11 by the respective tensions. .

Further, in the elevator horizontal holding device according to the second aspect of the present invention, the two sides of the elevators formed so as to intersect each other at a predetermined angle are provided with the peripheral portion holding mechanism configured as described above. I am trying to hold each.

[0007]

According to the first aspect of the invention, in each of the peripheral part holding mechanisms for holding at least three sides of the substantially quadrangular lifting platform, from the vicinity of the upper end of the column 10a at one end of each side to the other end of each side. The first wire 36 hung near the lower end of the column 10a is wound around the lower part of the first pulley 34a on the one end side and the upper part of the first pulley 3 on the other end side in the middle thereof. On the contrary, the second wire 37, which is wound from the vicinity of the lower end of the strut 10a on one end side of each side to the vicinity of the upper end of the strut 10a on the other end side of each side, is in the middle of the second pulley 34b on the one end side. Since it is wound around the upper part of the above and the lower part of the second pulley 35b on the other end side, the first wire 36 or the second wire 37 of each peripheral part holding mechanism is against the force to tilt the lift 11. By increasing the tension, the tilting of the lift 11 is prevented. Also,
Since the first and second wires 36 and 37 are both engaged with the lifting table 11 via the pulleys 31 and 32, there is no support for lifting the lifting table 11. Further, since each peripheral part holding mechanism is provided corresponding to each side of the lift table 11, even if the lift table 11 is large, the wires 36 and 37 are long, and the structure is extremely simple and low. Can be costly.

According to the second aspect of the invention, the two sides of the lift table formed so as to intersect at a predetermined angle are held by the peripheral part holding mechanism. In this case, if an attempt is made to incline the lifting platform about one side, the other side is tilted. Therefore, if the crossing angle is large to some extent, it is possible to hold the lifting platform horizontally only by the two peripheral holding mechanisms. it can.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 2 to 5 are views showing an embodiment of a horizontal holding device for a lifting platform according to the invention of claim 1, and an example in which the present invention is applied to a modeling shelf lifting device of a three-dimensional modeling system using a light effect resin. Is shown.

In these figures, 10 is a frame of this apparatus, 11 is a substantially rectangular elevator which is horizontally provided between four columns 10a of the frame 10, and the elevator 11 has a flat upper surface 12. Have The lifting table 11 is used as a modeling shelf for stacking and curing a photocurable resin to form a solid body, and is installed together with the frame 10 in an uncured resin liquid tank (not shown) to cure the photocurable resin. In order to stack the layers one on top of the other, the layers are kept horizontally in the uncured resin liquid and are driven up and down by a lifting drive means 50 described later. For this reason, the left and right parallel side edges 13A, 13
B is held by a pair of peripheral part holding mechanisms 21 and 22 so as to be able to move up and down and regulate the inclination in the front-rear direction, and a lifting table 11 that is orthogonal to the side edges 13a and 13B in the horizontal direction.
The rear edge portion 13C is held by the peripheral portion holding mechanism 23 so as to be able to move up and down and regulate the inclination in the left-right direction. In addition, guide portions 60A and 60B for preventing rotation are provided at two locations among the four corners of the lifting table 11, and these guide portions 60 are provided.
A and 60B engage with two diagonal columns 10a of the four columns 10a of the frame 10 to prevent rotation of the lift 11 about the vertical axis.

Specifically, the peripheral part holding mechanism 21 is interposed between the frame 10 and the lifting table 11 as shown in FIGS. 2 and 3, and is mounted on the lifting table 11 side as a member. A pair of pulley supporting shafts 31, 32 provided so as to project from the lifting platform 11 in parallel in the horizontal direction at both end sides of the side edge portion 13A which is one side of the lifting platform 11, and both pulley supporting shafts 31, 32. A pair of first pulleys 34a, 34b attached one by one, and first pulleys 34a, 34b
It has a pair of second pulleys 35a and 35b attached to the pulley support shafts 31 and 32 so as to be closer to the lift table 11. Further, the peripheral part holding mechanism 21 has first and second wire members 36 and 37 as members to be mounted on the frame 10 side. The first wire member 36 is shown in FIG.
From the upper end fixing member 41 fixed near the upper end of the column 10a on the left end side (one end side) of A to the lower end fixing member 42 fixed near the lower end of the column 10a on the right end side (other end side) of the side edge 13A. The first pulley 34 on the left side in the figure along with being passed over
The wire is wound around the lower part of a and the upper part of the first pulley 35a on the right side. In contrast to the first wire 36, the second wire 37 includes a lower end fixing member 44 fixed near the lower end of the column 10a on the left end side of the side edge 13A to a column on the right end side of the side edge 13A.
The wire is wound around the upper end fixing member 43 fixed near the upper end of 10a, and is wound around the upper part of the second pulley 34b on the left side and the lower part of the second pulley 35b on the right side in the middle of the wire. . The first wire 36 and the second wire 37 are
Each tension has a predetermined tensile strength enough to prevent tilting of the lift 11 in the left-right direction in FIG.

The peripheral portion holding mechanisms 22 and 23 are different from the peripheral portion holding mechanism 21 only in which edge (side) of the lift table 11 the arrangement position corresponds to. Since it is the same as the mechanism 21, the same reference numerals are given to the respective members and the detailed description of the peripheral part holding mechanisms 22 and 23 is omitted. As shown in FIG.
A loop-shaped belt 51 that is partially locked to the upper end, a pair of upper and lower pulleys 52 and 53 around which the belt is wound, and one of both pulleys 52 and 53 are fixed to the column upper end connecting portion 10a so as to rotate. The motor 54 and the wiper 55 engaged with the belt 51,
56 and a motor drive circuit (not shown). here,
One of the wipers 55, 56 is located in the vicinity of the uncured resin liquid surface indicated by imaginary line L in FIG. 2 and wipes off the uncured resin liquid adhering to the belt 51, and the other is on the front side in the moving direction. The dust and the like attached to the wire 51 (before the liquid surface) are removed. The elevating and lowering drive means 50 elevates and lowers the elevating table 11 in units of the amount of movement corresponding to the thickness of the cured layer of the light-effect resin (a solid body is formed as a laminated body thereof) (in this case, the elevating table 11 is not Descend in cured resin liquid). In addition,
The lifting drive means 50 may have a screw hole portion provided in a vertical direction on the side surface portion of the lift table 11 and a vertical screw member that is screwed into the screw hole portion, or the like, and a lift table having a predetermined weight. It may be one in which 11 is hung horizontally by a wire or a plurality of pulleys, or one in which a hoisting device or the like is used.

As shown in FIGS. 2 and 5, the detent guide portion 60A is attached to the protrusion 61 protruding from the lower surface of the lifting table 11 and the protrusion 61 so as to be orthogonal to each other in the horizontal direction. And a pair of rollers 62 and 63 that engage with the column 10a of the frame 10. Further, since the guide portion 60B is installed on the lift table 11 only on the opposite side of the guide portion 60A on the diagonal line of the lift table 11, the configuration of the guide portion 60B is the same as that of the guide portion 60A. The same reference numerals as above are given to the members, and the detailed description of both guide portions 60B is omitted.

In this embodiment having such a structure, the elevating / lowering drive means 50 is operated along with the progress of the molding operation using the photocurable resin, and the elevating / lowering table 11 is vertically moved.
At this time, the lifting platform 11 receives the upward or downward force at a position deviated from the center of gravity in the horizontal plane, or
Since it receives a resistance against the elevation, a moment to incline the elevation platform 11 acts.

Further, when a molded article or other object made of the above-mentioned photo-curing resin is placed on the lift table 11, a moment for tilting the lift table 11 also acts due to this. In such a case, in the present embodiment, the first and second wires 36 and 37 in each of the peripheral part holding mechanisms 21 to 23 have the first pulley.
Elevating table via 34a, 35a and second pulleys 34b, 35b
Since they are engaged with each other in the opposite directions, one of the wires 36, 37 cooperates with each pulley 34a, 35a or 34b, 35b against the moment that the tilting table 11 is inclined. The tension will be increased and any tilting of the lift 11 will be prevented by at least one wire 36 or / and 37 increasing its tension. That is, each peripheral portion holding mechanism 2 that holds the left and right side edge portions 13A and 13B of the lifting table 11
Inclination in the front-back direction of the lifting platform 11 is blocked by 1 and 22 (regulated)
At the same time, the peripheral holding mechanism 23 that holds the rear edge portion 13C of the lifting table 11 prevents the lifting table 11 from tilting in the left-right direction. Therefore, the lifting table 11 is always held horizontally.

Further, the peripheral portion holding mechanisms 21, 22, 23 are independent of each other, and side edge portions 13A, 13B corresponding to the respective sides of the lifting table 11 are independently provided.
Alternatively, since the rear edge portion 13C is held horizontally, for example, the lifting table 11
Even if the left and right width of the is large, just by widening the installation intervals of the peripheral part holding mechanisms 21 and 22 and arranging them on both the left and right sides of the lifting table 11,
It is possible to stably hold the lift table 11 horizontally. In addition, even if the width dimension of the rear edge portion 13C and the length of the side edge portions 13A and 13B (that is, the length of one side of the quadrangle) are large, the first and second wires 36,
As long as the length of 37 is long, a very simple structure can be achieved regardless of the size of the lifting table 11. Therefore,
Even if the lifting table 11 is large, the lifting table 11 can be stably held horizontally with a simple configuration.

FIG. 6 is a schematic configuration diagram showing an embodiment of a horizontal holding device for an elevator according to the invention as defined in claim 2. In the present embodiment, as shown in the schematic configuration of FIG. 1, a substantially trapezoidal (or triangular) lifting platform 71 is guided so as to be capable of moving up and down between a plurality of columns (not shown), and at a predetermined intersecting angle with each other. Lifting platform 71 formed to intersect
The left and right side edge portions 73A and 73B (two sides) are held by two peripheral portion holding mechanisms 81 and 82 configured similarly to the peripheral portion holding mechanisms 21 and 22 of the above-described example. That is, to explain using the same reference numerals for the same members as in the above-mentioned example, each of the peripheral part holding mechanisms 81, 82 has respective side edge parts 73A, 73B of the lifting platform 71.
A pair of sheave support shafts 31 and 32 projecting horizontally from the lift 71 at both ends of the sheave, and a pair of first sheaves 34a and 35a attached to the sheave support shafts 31 and 32, respectively. , First pulley
Both sheave support shafts 3 so that they are closer to the lift 71 from 34a, 35a
A pair of second pulleys 34b, 3 attached to 1 and 32, respectively
5b and from the vicinity of the upper end of the pillar on one end side of each side edge 73A, 73B to the vicinity of the lower end of the pillar on the other end side of each side edge 73A, 73B, and on the way of one first pulley 34a The first part wound around the lower part and the upper part of the other first pulley 35a
The wire 36 is hung from the vicinity of the lower end of the pillar on one end side of each side edge 73A, 73B to the vicinity of the upper end of the pillar on the other end side of each side edge 73A, 73B, and one second pulley 34 on the way.
The upper part of b and the second wire 37 wound around the lower part of the other second pulley 35b are provided, and the first wire 36 and the second wire 37 prevent the tilting of the lifting platform 71 by their respective tensions. It has a predetermined tensile strength that can be obtained. Although not shown, the guide portions for stopping rotation of the lift 71 are not shown, but the guide portions 60A, 60B for preventing rotation in the above-described example.
The substantially same member as the above is provided corresponding to each corner portion of the lifting platform 71.

In this embodiment, one side edge portion 73 of the lifting platform 71 is used.
If you try to tilt the lift 71 around A, the side edge 73
The other side edge portion 73B forming a predetermined intersection angle with A is inclined so that one end thereof is located above or below the other end. Therefore, if the crossing angles of the side edges 73A and 73B of the lifting table 11 are large to some extent, the peripheral part holding mechanism 21 of the above-mentioned example,
By the two peripheral holding mechanisms 81 and 82 which operate in the same manner as 22, it is possible to prevent any tilt of the lift 71.
The lifting platform 71 can be held horizontally.

As described above, in this embodiment, the lifting table 11
Both side edges 73A and 73B are crossed at a predetermined angle, and only the peripheral part holding mechanisms 81 and 82 can regulate the tilt of the lifting platform 71 in the left-right direction and the front-back direction to hold the lifting platform 71 horizontally. The configuration can be simplified. In each of the above-described embodiments, the peripheral part holding mechanism is provided only on the three sides of the lift table 11 or the two sides of the lift table 71, but the peripheral part holding mechanism is provided corresponding to each side of the lift table. It goes without saying that it can be provided. Further, instead of the rotation preventing guide portions 60A and 60B of the lifting table 11, another type of guide portion as shown in FIG. 7A or FIG. 7B can be adopted. In the case of FIG. 7A, the guide portion 160A for preventing rotation
Is a projecting portion 161 projecting from the elevating table 11 on the lower surface side of the horizontal table 11 so as to be close to any of the columns 101, 102, 103, 104 of the frame 100, and a pair of support shafts 162 provided on the projecting portion 161. , 1
63 and rollers 164 and 165 supported by both support shafts 162 and 163 so as to sandwich any of the columns 101 to 104 of the frame 100. The guide parts 160B and 160C are different from the guide part 160A only in the installation position and the installation direction (the directions are different from each other by 90 degrees) with respect to the lift table 11, and the configuration of the guide parts 160B and 160C itself is the same.
Similar to 60A. Further, in the case of FIG. 7B, the pair of guide portions 260A and 260B have guide posts 105, which correspond to the support columns of the above-described example, through slide bearings (not shown) provided on the protrusions 261 and 262, respectively. It is guided by 106 so as to be movable in the axial direction.

[0020]

According to the invention described in claim 1, the first wire or the second wire of each peripheral part holding mechanism increases the tension with respect to the force for inclining the elevating table. Therefore, it is possible to surely prevent the tilt while holding the lift table so that it can be lifted and lowered. Further, since each peripheral part holding mechanism holds the peripheral part of the lifting table, it is possible to provide a low-cost horizontal holding device having a simple structure regardless of the size of the lifting table.

According to the second aspect of the present invention, since the two sides of the elevating table intersecting at a predetermined angle are respectively held by the peripheral part holding mechanism, the elevating table can be leveled by only the two peripheral part holding mechanisms. It can be held, and the structure of the device can be further simplified.

[Brief description of drawings]

FIG. 1 is a principle diagram of a peripheral part holding mechanism in the invention according to claim 1;

FIG. 2 is a right side view showing an embodiment of the invention according to claim 1;

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a view taken along the line BB of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a schematic plan view showing an embodiment of the invention as set forth in claim 2;

7A and 7B are views showing two modifications of the rotation stopping guide portion in FIG.

[Explanation of symbols]

10 Frame 10a Column 11, 71 Lifting platform 13A, 13B Side edge (each side of lifting platform) 13C Rear edge (each side of lifting platform) 21, 22, 23 Peripheral holding mechanism 31, 32 Pulley support shaft 34a, 35a 1st pulley 34b, 35b 2nd pulley 36 1st wire 37 2nd wire 41, 43 Upper end fixing member 42, 44 Lower end fixing member 50 Lifting drive means 60A, 60B, 160A, 160B, 260A, 260B Guide for rotation stop Part 73A, 73B Side edge (two intersecting sides)

Claims (2)

[Claims] 1. A lift having a substantially square shape between a plurality of columns (10a).
(11) is guided up and down, and at least three sides (13A, 13B, 13C) of the elevator (11) are held by at least three peripheral part holding mechanisms (21, 22, 23), (11)
A horizontal holding device for an elevator, which constantly holds the elevator, wherein each of the peripheral part holding mechanisms (21, 22, 23) has an elevator (11) at both ends of each side of the elevator (11). From a pair of sheave support shafts (3
1, 32) and a pair of first pulleys attached to both pulley supporting shafts (31, 32)
(34a, 35a) and a pair of second pulleys (3, 3) attached to both pulley supporting shafts (31, 32) so as to be closer to the lift table (11) than the first pulleys (34a, 35a).
4b, 35b) from the vicinity of the upper end of the pillar (10a) on one end side of each side to the vicinity of the lower end of the pillar (10a) on the other end side of each side, and in the middle of The first wire (36) wound around the lower part of the first pulley (34a) and the upper part of the first pulley (35a) on the other end side, and from the vicinity of the lower end of the column (10a) on one end side of each side It is hung over the vicinity of the upper end of the column (10a) on the other end side of each side, and in the middle of that, it is placed on the upper part of the second pulley (34b) on the one end side and the lower part of the second pulley (35b) on the other end side. A second wire (37) wound around the first wire (36) and the second wire (37), which can prevent the tilt of the lift table (11) by the respective tensions. A horizontal holding device for an elevating table, which has the following tensile strength. 2. An elevating table (71) is guided between a plurality of columns so that it can be moved up and down, and two sides (73A, 73B) of the elevating table (71) are formed so as to intersect each other at a predetermined angle. A horizontal holding device for an elevating table that is held by one peripheral part holding mechanism (81, 82) and always holds the elevating table (71) horizontally, wherein each of the peripheral part holding mechanisms (81, 82) is A pair of sheave support shafts (3) provided so as to horizontally project from the lift table (71) at both ends of each side of the lift table (71).
1, 32) and a pair of first pulleys attached to both pulley supporting shafts (31, 32)
(34a, 35a) and a pair of second pulleys (3, 3) attached to both pulley supporting shafts (31, 32) so as to be closer to the lift table (71) than the first pulleys (34a, 35a).
4b, 35b) and from the vicinity of the upper end of the pillar on the one end side of each side to the vicinity of the lower end of the pillar on the other end side of each side, and in the middle of the first pulley (34a) on the one end side. The lower part and the first end on the other end side
The first wire (36) wound around the upper portion of the pulley (35a) and the first wire (36) wound around the lower end of the pillar on one end side of each side to the vicinity of the upper end of the pillar on the other end side of each side, and On the way, the upper part of the second pulley (34b) on the one end side and the second pulley on the other end side
A second wire (37) wound around the lower portion of the pulley (35b), and the first wire (36) and the second wire (37) are inclined by the respective tensions of the lift table (71). A horizontal holding device for a lift, having a predetermined tensile strength capable of preventing