JPS6234884Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intermittent conveyance device for articles.

In general, an intermittent conveyance device for articles is used, for example, in an automobile body welding assembly line, to convey the body from one work station to the next, perform a predetermined welding operation here, and then transfer the body to the next work station. It is for conveying bodies, and as an intermittent conveyance device for such articles, conventionally, a reciprocating mechanism having an article pedestal is provided on a vertical movement mechanism, and the pedestal is moved to draw a rectangular shape. In other words, the pedestal is raised by a vertical movement mechanism, moved forward by a reciprocating mechanism in this state, lowered at the advanced position, and then retreated to the original position, thereby intermittent conveyance of articles. Something was warm. However, with this conventional device,
There are problems in that the device becomes larger and a drive device with greater power is required, resulting in higher costs. Further, during the time when the reciprocating mechanism is retracted, work cannot be performed at each work station for safety reasons, and therefore, this time becomes loss time, resulting in a problem of poor work efficiency.

The present invention was devised in view of the problems of the conventional ones, and includes a plurality of work stations having fixed pedestals and arranged in a straight line at equal intervals.
A vertically movable frame having a length spanning all the work stations and disposed through all the work stations is provided, a vertically moving means for vertically moving the frame is provided, and a vertically movable frame is provided at the front and rear ends of the vertically movable frame. An endless conveyance chain is provided along the vertically movable frame that is extended around a sprocket that is rotatably provided on a horizontal axis, and movable pedestals are provided on the upper surface of the chain at the same intervals as the work station, The vertically movable frame is provided with a support frame that supports at least the lower surface of the tension side of the chain, and the chain is intermittently driven in the article conveying direction at intervals of work stations only while the vertically movable frame is ascending. It is an object of the present invention to provide an intermittent conveyance device for articles, which can convey articles in a substantially positioned state with a simple configuration by providing a driving means, and can greatly improve conveyance efficiency.

An embodiment of the present invention will be described below with reference to the drawings.
1 to 3 show an embodiment of the present invention,
In the figure, 1 to 3 are first to third work stations;
are arranged in a straight line at equal intervals L, and each of these work stations 1 to 3 has four fixed pedestals 1a to 3a facing upward (in the direction perpendicular to the plane of the paper in Figure 1). The fixed pedestals 1a to 3a are provided with workpieces 4a to 4, which are objects, on the fixed pedestals 1a to 3a.
c can be placed on it.

Further, a vertically movable frame 5 that passes through all of the first to third work stations 1 to 3 is arranged. Left and right frames 6 and 7 are provided on the left and right sides of the vertically moving frame 5, respectively.
Above and below the right frames 6 and 7, the upper frame 6
a, 7a and lower frames 6b, 7b are arranged, and each of the upper and lower frames 6a, 7a, 6b, 7
b has a C-shaped cross section and has a length spanning all of the first to third work stations 1 to 3;
The left upper and lower frames 6a to 6b and the right upper and lower frames 7a and 7b each include a plurality of connection plates 6.
It is connected and fixed at c and 7c. Also above left,
Guide bars 6d, 7 are provided at the tips of the left and right sides of the right upper and lower frames 6a, 7a, 6b, and 7b.
Guide plates 6e, 7e having a diameter d are attached, and the upper and lower frames 6a, 7a,
Inside 6b and 7b are upper and lower support frames 8 and 9.
are attached, and the upper and lower support frames 8,
Reference numeral 9 is a rectangular bar-shaped member having chain guide grooves 8a, 9a recessed in its outer surface, and has approximately the same length as the left and right frames 6, 7.

The left frame 6 and the right frame 7 are connected and fixed by four connecting frames 10, and the left and right ends of the connecting frames 10 are provided with mounting holes 10a.
A guide mounting bracket 10b having a guide mounting bracket 10b is inserted and fixed therein, and a threaded portion 1 is provided at the upper end of the mounting hole 10a.
1a is fitted vertically upward from below, and the threaded portion 11a of the guide pipe 11 is fastened and fixed to the guide mounting bracket 10b by a fixing nut 11c. In addition, two guide rollers 12 are disposed at two locations above and below the front and rear sides of the guide pipe 11, respectively, in contact with the guide pipe 11, and the guide rollers 112 have a square cylindrical shape. Box 13a
The roller holding box 13a is fixed to the roller mounting bracket 13 with bolts, and the roller holding box 13a is fixed to the roller mounting bracket 13 with bolts.
is the above-mentioned connecting frame 1 whose lower end is the floor surface 15.
It is bolted and fixed to a fixed frame 14 disposed below 0. The fixed frame 14 is formed into a flat plate using a square pipe 14a, and a base plate 14b is fixed to the upper surface of the fixed frame 14, and an escape hole 14c formed in the base plate 14b
The lower end of the guide pipe 11 is inserted into the fixed frame 14, and the height from the floor 15 is adjusted by adjusting bolts 14d provided at the left and right ends of the fixed frame 14.
It is bolted to a stopper 16 fixed to the floor 15 to prevent it from moving left or right.

Further, upper and lower limit switches 17a and 17b are attached to the left bracket 13, and roller levers 17c and 17d of the upper and lower limit switches 17a and 17b are connected to the limit switch 1.
1d, and the limit shoe 11d passes through a long guide hole 13c vertically formed in the mounting plate 13b of the roller mounting bracket 13, and connects to the left guide pipe. It is inserted into the lower part of 11 and fixed with bolts.

Further, a rack guide bracket 18 is secured to the fixed frame 14 below the connection frame 10 with bolts. A box-shaped pinion box 18 is provided on the top of the rack guide bracket 18.
a is formed above the pinion box 18a,
Cylindrical bearing brackets 18c, 18 are provided on the lower surface.
d is inserted and fixed on a vertical line, and a cylindrical sliding bearing 19 is installed in the bearing brackets 18c and 18d.
a and 19b are fitted and fixed. Pinion bearings (not shown) are bolted and fixed near the center of the front and rear sides of the pinion box 18a, and a pinion shaft 20 is inserted into the pinion bearings so as to protrude outward from the pinion box 18a. As a result, the pinion shaft 20 is rotatably supported by the pinion box 18a. Further, a fourth upper and lower sprocket 21 is fitted and fixed to the outside of the pinion box 18a of the pinion shaft 20, and the pinion box 18a
A pinion 22 is fitted inside and fixed with a key 22a.

And the connecting frame 1 of the vertically movable frame 5
A rack mounting bracket 23 is fitted and fixed in the center of the rack mounting bracket 23, and a flange receiving part 23a is recessed in the upper surface of the rack mounting bracket 23, and a rack penetration hole 23b is formed in the lower part of the flange receiving part 23a. A rack rod 24 is inserted into the rack penetration hole 23b, and a rack rod 24 is inserted into the rack penetration hole 23b.
4 is inserted into the slide bearings 19a, 19b so as to be able to freely slide vertically downward, and its lower end is inserted into a relief hole 14d provided at the center of the fixed frame 14. The rack 24 is cylindrical,
A disk-shaped mounting flange 25 is fitted and welded to its upper end, and the mounting flange 25 is fixed to the rack mounting bracket 23 with mounting bolts 25a. A rack 24a is formed on the rack rod 24, and the rack 24a meshes with the pinion 22. Further, a stopper member 26 is fixed to the lower end surface of the rack rod 24 by a mounting bolt 26a, and the stopper member 26 is fixed to the lower end surface of the rack rod 24.
When it rises to its rising end position, it comes into contact with the bearing bracket 18d.

Further, on the right side of the vertical movement frame 5 on the floor surface 15, there is a vertical movement motor 26 and a speed reducer 27.
These are connected by a coupling ring 28, and a first upper and lower sprocket 29 is fitted and fixed to the output shaft of the reduction gear 27.
Further, a shaft bracket 30 is arranged and fixed in a straight line on the right side of each fixed frame 14, and the shaft bracket 30 has an L-shaped cross section, and a bearing 31 is bolted and fixed to the vertical surface of the shaft bracket 30. The bearing 31 has a vertical drive shaft 3.
2 is inserted. A second vertical sprocket 33 is fitted and fixed near the center of the vertical drive shaft 32, and the second vertical sprocket 33 and the first vertical sprocket are connected to each other.
What is the upper and lower sprocket 29? The first upper and lower chain 34
are connected. In addition, the vertical drive shaft 3
A third upper and lower sprocket 35 is fitted and fixed to the lower part of the connecting frame 10 of No. 2, and the third upper and lower sprocket 35 and the fourth upper and lower sprocket 21 are connected by a second upper and lower chain 36.

Further, drive shaft brackets 6f, 7f are provided at the front end of the vertically movable frame 5 to protrude forward, and the brackets 6f, 7f have bearings 37a,
38a is attached, and a horizontal second conveyance drive shaft 39 is inserted into the bearings 37a, 38a.
is rotatable with respect to the vertically movable frame 5, and the second conveyance drive shaft 39 has left and right third
Conveyance sprockets 40a and 40b are fitted and fixed. Further, driven shaft brackets 6g and 7g are provided at the rear end of the vertically movable frame 5 to protrude rearward, and a driven shaft 41 is fitted into and fixed to the driven shaft brackets 6g and 7g. left,
Fourth right conveyance sprockets 42a and 42b are rotatably fitted.

And the third and fourth conveyance sprockets 40 on the left
Endless left conveyance chain 43 is installed at a and 42a.
An endless right conveyance chain 44 is also stretched across the third and fourth right conveyance sprockets 40b and 42b, and these left and right conveyance chains 43 and 44 are connected to the support frame 8. , 9 chain guide grooves 8a, 9
It is designed to be able to slide along a. In addition, the left and right conveyance chains 43 and 44 are provided with the first to third work stations 1 to 44 over their entire length.
Two left and right pedestal brackets 45 and 46 are attached at the same interval as the interval L of each of 3, and two guide rollers are attached to the left and right pedestal brackets 45 and 46, respectively. 47 is rotatably attached, and the guide roller 47 is attached to the left,
Guide bar 6 attached to right frame 6, 7
d, 7d, and the above left and right pedestal brackets 4
5 and 46 from swinging in the left and right direction.

A first left movable pedestal 45a and a second left movable pedestal 45b are alternately attached to each of the left pedestal brackets 45, and a first right movable pedestal 46a and a right first movable pedestal 45b are attached to the right pedestal bracket 46, respectively. Second movable pedestal 46b
are attached alternately, and the first left movable pedestal 45a, the second left movable pedestal 45b, the first right movable pedestal 46a, and the second right movable pedestal 46.
The distance between the two work stations is equal to the distance L between the work stations. Furthermore, workpiece placement portions 45c and 46c are formed at the upper end of each of the pedestals, and the workpiece 4 is placed on the four workpiece placement portions 45c and 46c on the left and right sides. .

Further, on the left side of the front end of the vertically movable frame 5 on the floor surface 15, a conveyance motor 50 for intermittently moving the chains 43 and 44 in one direction is installed, and a reduction gear 51 is connected to the conveyance motor 50. A first conveyance sprocket 52 is fitted and fixed to the output shaft of the reducer 51, and the sprocket 52 is driven by a second conveyance sprocket 55 of a torque limiter 54 attached to one end of the first conveyance drive shaft 53. They are connected by a chain 56. The first conveyance drive shaft 53 is rotatably supported by a bearing 57, and the other end of the first conveyance drive shaft 53 is connected to the second conveyance drive shaft 39 by an intermediate shaft 58. The shaft 58 is rotatable about the connection point with the first conveyance drive shaft 53, and in a bent state, the rotation of the first conveyance drive shaft 53 is transferred to the second conveyance drive shaft 3.
It is now possible to transmit to 9.

Next, the operation will be explained.

First, to explain the operation from the state where the vertically movable frame 5 is at its lower end position, in this case, the first to third work stations 1 to 3 have the workpieces 4a to
4c, and each of the works 4a to 4c is placed on a fixed pedestal 1a, 2a, and 3a, respectively. When transporting each of the works 4a to 4c to the next work station, the vertical movement motor 26 is first activated. Then, the rotation of the vertical movement motor 26 is the first,
It is transmitted to the vertical drive shaft 32 via the second vertical sprockets 29 and 33, and the vertical drive shaft 3
2 rotation is the 3rd and 4th upper and lower sprockets 35, 2
1 and the pinion 22 via the pinion shaft 20
This causes the rack rod 24 to rise, and as the rack rod 24 rises, the vertically movable frame 5 also rises. In this case, the conveyance chains 43 and 44 are also naturally raised by the vertical movement frame 5, and the conveyance chains 4
When the mounting surfaces 45c and 46c of each movable pedestal No. 3 and 44 rise above the upper surface of each of the fixed pedestals 1a, 2a and 3a, each workpiece 4a to 4c is placed on each movable pedestal 45a,
Placement surfaces 45c, 46c of 45b, 46a, 46b
Translated above. When the vertically moving frame 5 rises to its upper end position, the roller lever 17c of the upper limit switch 17a is turned on by the limit switch 11d, and the vertically moving motor 26 is stopped by this ON signal, and the vertically moving frame 5 is stopped and held at its ascending end position. In this state, the transport motor 50
is started, and the rotation of the transport motor 50 is controlled by the speed reducer 5.
1, it is transmitted to the third conveyance sprockets 40a, 40b via the first and second conveyance sprockets 52, 55, the first conveyance drive shaft 53, the intermediate shaft 58, and the second conveyance drive shaft 39. The left and right conveyance chains 43 and 44 move forward to the left in FIG.
When the works 4a to 4c on each movable pedestal 45a, 45b, 46a, 46b are transported to the next adjacent work station, the transport motor 50 is stopped and each work 4a, 4b is transferred to the next adjacent work station. While being held, the workpiece 4c is carried out of the apparatus using a crane or the like. While the works 4a and 4b are held, the vertical motor 26 rotates in the opposite direction to the upward movement, thereby causing the pinion 22 to rotate in the opposite direction and moving the vertical movement frame 5 to its lowering end position. When the lower limit switch 17b is lowered, the lower limit switch 17b is turned on, and this on signal causes the vertical movement motor 26 to stop, and the vertical movement frame 5 is held at that position. At this time, the works 4a and 4b on each of the movable pedestals are fixed to the fixed pedestals 2a and 3.
It will be transferred to a. Further, a new workpiece is brought into the first work station 1 from outside the apparatus by a crane or the like.

and the above-mentioned first to third work stations 1 to 3.
When a predetermined welding operation or the like is performed on each workpiece 4, the vertically movable frame 5 rises again.
During the ascent, the workpiece 4 is moved to the movable cradle 45a, 4
5b, 46a, 46b on the mounting surfaces 45c, 46c, the conveyance chains 43, 44 move forward at the rising end position of the vertically movable frame 5, each workpiece 4 is conveyed to the next work station, and then The vertically movable frame 5 is lowered and each workpiece 4 is transferred onto the fixed pedestal, and in this way, each workpiece 4 is intermittently and sequentially transported.

In the device of this embodiment configured and operated in this manner, the vertically movable frame 5 is provided with movable pedestals 45a and 45.
When the left and right conveyance chains 43 and 44 having 46b, 46a and 46b are provided to convey the workpiece 4,
It is only necessary to raise the vertically movable frame 5, advance the conveyor chains 43 and 44 at its ascending end position, and lower the vertically movable frame 5 at its forward end position. This eliminates the need for such a device, and of course eliminates the time required to retreat, resulting in a simple structure and greatly improved conveyance efficiency.

In the above embodiment, two conveyance chains are provided, but one conveyance chain may be used. Further, although a rack and pinion is used as the vertical driving means, other methods may be used, for example, a cylinder may be used. Further, although the support frame is provided on both the tension side and the slack side of the conveyance chain, the support frame may be provided only on the tension side.

As described above, according to the intermittent conveyance device for articles according to the present invention, a plurality of work stations having fixed pedestals and arranged in a straight line at equal intervals are provided, and the apparatus has a length that spans all the work stations. A vertically movable frame is provided which is disposed through all the work stations, and a vertically movable means for vertically moving the frame is provided, and the vertically movable frame is connected to a sprocket rotatably provided on a horizontal axis at the front and rear ends of the vertically movable frame. An endless conveyance chain is provided along the vertically movable frame, movable supports are provided on the upper surface of the chain at the same intervals as the work station, and the lower surface of at least the tension side of the chain is provided on the vertically movable frame. A support frame supporting the above is provided, and a chain drive means is provided for intermittently driving the chain in one direction at intervals of the work stations only while the vertically movable frame is ascending.
With a simple configuration, it is possible to transport articles in a substantially positioned state, which has the effect of greatly improving transport efficiency.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an intermittent conveyance device for articles according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view taken along the line -- in FIG. 1-3...1st-3rd work station, 1
a, 2a, 3a...Fixed pedestal, 5...Vertical movement frame, 8...Support frame, 22, 24a, 26
... Vertical drive means (pinion, rack, vertical movement motor), 40a, 40b, 42a, 42b ... Sprocket, 43, 44 ... Conveyance chain, 4
5a, 45b, 46a, 46b...movable cradle, 5
0...Chain drive means (conveyance motor).

Claims (1)

[Scope of utility model registration request] A plurality of work stations having fixed pedestals for placing articles and arranged in a straight line at equal intervals, and having a length that spans all of the work stations, is arranged through all of the work stations, and is movable up and down. A vertically moving frame provided on the vertically moving frame, a vertically driving means for vertically moving the vertically moving frame, and a sprocket that is rotatably provided on a horizontal axis at the front and rear of the vertically moving frame, and an endless conveyance chain disposed along the chain; a movable pedestal provided on the upper surface of the chain at the same spacing as the work station on which articles are placed;
A support frame is provided on the vertically moving frame and supports at least the lower surface of the tension side of the chain, and the chain is intermittently driven in the article conveyance direction at intervals of work stations only while the vertically moving frame is ascending. What is claimed is: 1. An intermittent conveyance device for articles, comprising a chain drive means.