JPH0335234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a lifter device used, for example, in an automobile assembly process.

Conventional technology Conventionally, as this type of lifter device, for example, the first
The structure shown in the figure is well known. As shown in the figure, a pair of guide posts 2, 2 and a cylinder 3 are installed upright on a fixed base 1 on a floor F, and a lifter table 4 that moves up and down while being guided by the guide posts 2, 2 is installed. , the tip of the piston rod 3a of the cylinder 3 is connected to the lower surface of the lifter table 4.

In order to ensure the levelness of the lifter table 4 when going up and down, a rack 5 is attached to each of the guide posts 2 and 2, and a pinion 6 that engages with the rack 5 is attached to the lifter table 4 side.
is provided.

According to such a lifter device, the smoothness when lifting and lowering the lifter table 4 is ensured by the guide posts 2 and 2.
It is determined by the machining accuracy of the sliding guide portion on the lifter table 4 side, and the lifter table 4 can freely move up and down within the range of the up and down stroke S.

Note that B is an automobile body (workpiece) positioned and placed on the lifter table 4 via a finger 7 serving as a workpiece receiver.

However, according to the conventional lifter device, as mentioned above, the smoothness of the lifter table 4 depends largely on the relative accuracy of the guide posts 2, 2 and the sliding guide part on the lifter table 4 side. High-precision machining is required to achieve alignment accuracy of 2, 2 and the sliding guide part.

Furthermore, even if the rack 5 and pinion 6 are provided, the center of gravity of the workpiece, the automobile body B, does not necessarily coincide with the center position of the cylinder 3, resulting in an unbalanced load. Otherwise, it will be difficult to maintain the levelness of the lifter table 4 at the upper limit position.
The overall cost tends to be high.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a lifter device in which it is easy to maintain the horizontality of a lifter table, and which is advantageous in terms of manufacturing cost.

Structure of the Invention For this purpose, the lifter device of the present invention includes a horizontal fixed base, a guide post vertically erected on the fixed base, and a guide post erected on both sides of the fixed base with the guide post sandwiched therebetween. and a lifter table that is connected to the tip of the piston rod of the cylinder via a floating joint member and that moves up and down while being guided by the guide post with an effective guide length in the vertical direction that is larger than the diameter of the guide post. The stopper is attached to both ends of a bar provided horizontally at the upper end of the guide post, and comes into contact with the lifter table when the lifter table is raised to restrict the upper limit position of the lifter table.

Embodiments Hereinafter, more specific embodiments of the present invention will be described based on the drawings. However, the same parts as in the conventional example described above are given the same reference numerals.

FIG. 2 is a diagram showing an embodiment of the present invention, in which the guide post 10 is of a prismatic type. In the same figure, reference numeral 1 indicates a horizontal fixed base installed on the floor F, and a square column type guide post 10 is vertically installed integrally at the center of this fixed base 1.
Cylinders 11 of the same size as actuators are installed on both sides of the cylinder 0 so as to be left and right symmetrical.
11 has been erected.

The cylinders 11, 11 are of an adjustable type with bolts 12, 12 in order to facilitate centering work.

Reference numeral 13 designates a horizontal lifter table, and the piston rods 11a, 11a of the cylinders 11, 11 are connected to the lower surface of the lifter table 13 via a floating joint member, for example, a clevis 14 of a spherical joint type.
Lifter table 13 due to the functions of 1 and 11
is configured to move up and down while being guided by a guide post 10. More specifically, the lifter table 13 is provided with a plurality of adjustable roller supports 15, and the guide rollers 16 held by these roller supports 15 are brought into contact with the four sides of the guide post 10, respectively.

Then, the effective guide length h in the vertical direction of the lifter table 13 is set to be larger than the width (diameter) d of the guide post 10, and more preferably, the ratio between the width d and the effective guide length h is set. It is set so that h/d is 1.5 or more.

A horizontal bar 18 is fixed to the upper end of the guide post 10, and stoppers 17 are provided at both ends of the bar 18. When the end block 19 on the lifter table 13 side comes into contact with the stopper 17, the lifter table No. 13 ascent limit position is regulated. Further, the lower limit position of the lifter table 13 is regulated by the lower limit position of the cylinders 11, 11.

According to the above configuration, the lifter table 13 is connected to the cylinder 1 on both sides of the guide post 10.
1 and 11, it is easy to maintain the levelness of the lifter table 13 at the upper limit position, and since the end block 19 comes into contact with the stopper 17, the lifter table 13 at the upper limit position can be easily maintained. The levelness of the table 13 is guaranteed. Further, since only one guide post 10 is required, the number of man-hours for achieving alignment accuracy of the guide post 10 and the number of machining steps can be significantly reduced.

FIG. 3 shows a second embodiment of the present invention, which differs from the first embodiment in that the guide post 10
A is changed from a square column type to a round column type, and a cylindrical sleeve guide 15A is used in place of the roller support 15. In the case of this embodiment as well, the same effects as in the first embodiment can be obtained.

Moreover, FIG. 4 shows a specific usage example of the lifter device shown in FIG.
It is a combination of Specifically, when the conveyor 20 is in a stopped state, the lifter tables 13 are raised all at once to lift up the automobile body B, which is a workpiece, on the conveyor 20, and a predetermined process such as welding is performed at the upper limit position. After the processing is completed, the lifter table 13 is lowered to transfer the automobile body B to the conveyor 20 again, and the conveyor 20 is horizontally moved by one pitch to repeat the above operation.

Note that in both the first and second embodiments, the cylinder 11
Although the case where one each is arranged on the left and right is illustrated, two may be arranged on each of the left and right depending on the size and weight of the workpiece.

Effects of the Invention As described above, according to the present invention, cylinders for driving the lifter table up and down are arranged on both sides of the guide post that guides the lifting movement of the lifter table, and the lifter table is mounted on the stopper provided on the guide post. By making contact with the lifter table to restrict the lifter table's ascent limit position, it is easy to maintain the levelness of the lifter table at the ascent limit position, and since only one guide post is required, the alignment accuracy of the guide post is improved. The number of man-hours for ejecting and machining are significantly reduced, and it is also significantly advantageous in terms of manufacturing costs.

Furthermore, by providing a floating joint member at the connection between the lifter table and the piston rod to provide a degree of freedom, it is possible to prevent cylinder posture errors from affecting the horizontality of the lifter table. Since the levelness of the table at the upper limit position is guaranteed by the stopper, there is no longer a need to strictly control the positional accuracy and angle of the cylinder during manufacturing, as well as the levelness of the lifter table. This also makes it possible to significantly reduce the number of manufacturing steps.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a conventional lifter device, FIG. 2 is an explanatory diagram showing an embodiment of the present invention,
FIG. 3 is an explanatory view showing another embodiment of the present invention, and FIG. 4 is an explanatory view showing a specific example of use of the lifter device shown in FIG. 3. 1... Fixed base, 10, 10A... Guide post, 11... Cylinder, 11a... Piston rod, 13... Lifter table, 14... Clevis as joint member, 17... Stopper, 18... Bar, 19 ... End block.

Claims (1)

[Claims] 1. A horizontal fixed base, a guide post vertically erected on the fixed base, a cylinder erected on both sides of the fixed base with the guide post sandwiched therebetween, and a piston rod of the cylinder. A lifter table that is connected to its tip via a floating joint member and moves up and down while being guided by the guide post with an effective vertical guidance length that is larger than the diameter of the guide post, and a lifter table that is horizontal to the upper end of the guide post. A lifter device comprising: stoppers that are attached to both ends of a bar provided on the lifter table and come into contact with the lifter table when the lifter table is raised to regulate the upper limit position of the lifter table.