JPS6265810A - Conveyer device - Google Patents

Abstract

PURPOSE:To make possible to easily change the conveying speed of a carriage such as, for example, a pallet, by fitting, on a rotary drive shaft, a frictional drive wheel making into contact with the frictional rail surface of either one of steps in a stepped cross-sectioned shape friction rail attached to the lower surface of the carrier bed on each side thereof. CONSTITUTION:Frictional rail surfaces 16a-16d having different vertical spaces between themselves and horizontal rotary drive shafts 4 arranged at predetermined intervals in the conveying path direction, are formed in several rows in a pair of right and left frictional driven rails 2 which are attached to the bottom surface of a pallet 1 along the traveling direction thereof. Further, each rotary drive shaft 4 is attached with one of frictional drive wheels 19a-19d which makes into contact with any one of the frictional rail surfaces 16a-16d, and is rotated by a drive means 6 which is constituted such that it drives the rotary drive shafts 4 by the rotation of a main drive shaft 8 extending in the conveying direction through an endless rope 13 wound on a drive sheave 9 and an idle sheave 12 on the shaft 8 and a driven sheave 11 and an idler sheave 12.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is generally referred to as a free flow conveyor, in which a moving platform for conveying pallets etc. is frictionally driven and propelled by friction drive wheels on the conveyance path side. The present invention relates to a type of conveyance device.

(Prior art and its problems) In this type of conveyance device, the moving speed of the conveyance movable table, that is, the conveyance speed, is determined by the circumferential speed of the friction drive wheels. Alternatively, the rotational drive speed must be changed. Changing the diameter of the friction drive wheel will change the height of the conveying carriage, and the conveyance in one continuous conveying line will change. It is inappropriate as a method for incorporating route sections with different speeds. In addition, although the method of changing the rotational drive speed does not have the above-mentioned problems, it not only increases cost but also makes it difficult to change the position and path length of the path portions with different conveyance speeds, making it difficult to apply. Limited.

That is, conventionally, with this type of conveyance device, it has not been possible to easily and inexpensively incorporate path portions with different conveyance speeds into one continuous conveyance line.

(Means for Solving the Problems) The present invention proposes a conveyance device capable of solving the conventional problems as described above, and its feature is that the conveyance device is configured to perform cross-direction transport at regular intervals along the conveyance route. A driving means is provided to support the rotary drive shafts of the rotary drive shafts and to drive the rotary drive shafts in a constant-velocity interlocking manner in the same direction. A driven friction rail having a plurality of rows of friction rail surfaces with different intervals between them is attached along the moving direction, and each rotational drive shaft is provided with one of the friction rail surfaces of the driven friction rail. The point is that a friction drive wheel of a diameter that contacts one is attached.

(Function) In the above-mentioned conveying device of the present invention, each rotary drive shaft is driven in a uniformly interlocked manner in the same direction by the drive means, and the friction drive wheels attached to each rotary drive shaft are rotated. , it is possible to propel a transport carriage that contacts this friction drive wheel via a friction rail surface. The moving speed of the transfer platform at this time is determined by the diameter of the friction drive wheel that contacts the friction rail surface when the rotation speed of each rotary drive shaft is constant. By selecting from a plurality of types of friction rails having different diameters that contact the friction rail surface of each stage of the friction rail on the transfer table side, the moving speed of the transfer table can be selectively selected.

Of course, the height of the transport carriage does not change depending on the diameter of the friction drive wheel used.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a pallet serving as a transport platform, and a pair of left and right driven friction rails 2 and 3 are fixed to the bottom of the pallet over its entire length along the direction of movement. Reference numeral 4 denotes a horizontal rotary drive shaft that crosses the conveyance path, and is arranged at regular intervals in the direction of the conveyance path, and both ends are supported by bearing frames 5a and 5b. Reference numeral 6 denotes a drive means for driving the rotational drive shafts 4 in the same direction at a constant speed, and includes a single drive main shaft 8 supported along the transport path direction by one bearing frame 5a via a bearing 7. A drive sheave 9 is fixed to the drive main shaft 8 at a lower position of each rotary drive shaft 4, and an idler sheave 10 is rotatably and loosely supported by the drive main shaft 8. A driven sheave 11 is fixed to the free end of the rotary drive shaft 4 located above the drive main shaft 8, and an idler sheave 12 is rotatably loosely fitted and supported by the rotary drive shaft 4.
, and an endless driving lobe 13 suspended from each sheave 9 to 12.

As shown in FIG. 4, the driving row 113 guides the endless rope 13, which is passed around the upper half of the driven sheave 11, downward, and passes it around the lower halves of the drive sheave 9 and the idle sheave 10, respectively. A hook is guided further upward and extends over the upper half of the idle sheave 12, and is hung so as to form an inverted U-shape when viewed from the front of the rotary drive shaft 4 and a U-shape when viewed from the side.

Incidentally, each free-rotating sheave 10, 12 is naturally positioned by the tension of the endless row 113 without being particularly positioned so as not to move in the axial direction with respect to the drive main shaft 8 and the rotary drive shaft 4. Further, the drive sheave 9 and the driven sheave 11 are fixed to the drive main shaft 8 and the rotary drive shaft 4 with setscrews 14, 15, etc., and the tension of the endless row 113 can be adjusted by adjusting the fixing position in the axial direction. It is. That is, there is no need to use a separate tensioner.

As the driving endless lobe 13, it is preferable to use a continuous bead type to prevent slipping.In this case, of course, each sheave 9 to 12 should also be provided with a groove that is compatible with the continuous bead type endless row 113. Must.

The driven friction rail 2.3 of the pallet 1 has a plurality of rows of friction rail surfaces with different vertical distances from the rotational drive shaft 4, that is, low-speed friction rail surfaces 16 from those closest to the rotational drive shaft 4.
a, a rack gear 16b for the vertically inclined path section, a medium-speed friction rail surface 16c, and a high-speed friction rail surface 16d are formed in a step shape. 17a and 17b are pallet guides that guide the pallet 1 using the outer vertical surfaces of the driven friction rails 2 and 3, and the left and right bearing frames 5
It is attached to the upper end of a and 5b. Reference numeral 18 denotes a detachable cover plate that covers the drive means 6, and is attached to the bearing frame 5a.

On the other hand, each rotary drive shaft 4 has friction rail surfaces 16a to 16 on the driven friction rails 2 and 3 on the pallet 1 side.
Friction drive wheel 1 whose peripheral surface contacts d and supports pallet 1
A pair of left and right friction drive wheels selected from among the friction drive wheels 9a to 19d (a pinion gear is used for the friction drive wheels 19b corresponding to the gears 16b), for example, the low speed friction drive wheels 19a, are attached. Each of these friction drive wheels +9
a to 19d have a diameter difference corresponding to the step rib between each friction rail surface 168 to 16d so that the height of the pallet 1 does not change no matter which one is used.

In the conveying device configured as described above, the driving main shaft 8
When the driving sheave 9 is rotated in a predetermined direction, the driving endless lobe 13 rotates as shown in FIG. It will rotate at a constant speed. At this time, idle sheave 1
0 rotates in the opposite direction on the drive main shaft 8, and the idle sheave 12 rotates in the opposite direction on the rotary drive shaft 4. The rotation of each rotary drive shaft 4 rotates the left and right low-speed friction drive wheels 19a attached thereto, and the low-speed friction drive wheels 19a are attached to the left and right driven friction rails 2.3. The pallet 1 supported via the rail surface 16a is propelled in a predetermined direction at a low speed determined by the circumferential speed of the friction drive wheel 19a.

Therefore, in place of the low-speed friction drive wheel 19a, a medium-speed friction drive wheel 19C corresponds to the medium-speed friction rail surface 16C of the pair of left and right driven friction rails 2.3 on the pallet throat 1 side. If the pallet 1 is attached to each rotary drive shaft 4 at the same position, the pallet 1 will be propelled at a medium speed determined by the circumferential speed of the high-speed friction drive wheel 19C, and the high-speed friction drive wheel 19d will be attached to the pallet 1. High-speed friction rail surface 16 in the pair of left and right driven friction rails 2 and 3 in the example
When the pallet 1 is attached to each rotary drive shaft 4 at a position corresponding to d, the pallet 1 is propelled at a high speed determined by the circumferential speed of the high-speed friction drive wheel 19d.

Of course, it is also possible to propel the pallet 1 at the same speed over the entire length of the conveyance path, but the conveyance path is divided into a low-speed conveyance path, a medium-speed conveyance path, and a high-speed conveyance path, and the rotational drive shaft belonging to each path is By attaching corresponding friction drive wheels 19a, 19c, and 19d to the pallets 4, the moving speed of the pallet 1 can be automatically switched for each route portion. In this case, the driven friction rails 2 and 3 of the pallet 1 come into contact with two types of friction drive wheels with different circumferential speeds at the boundary between each conveyance path, so the rotation of the plurality of rotating wheels located at this boundary By using the friction drive wheel attached to the drive shaft 4 as a friction type that can rotate freely when a load above a certain level is applied to the rotary drive shaft 4, it is possible to transfer the pallet 1 between sections of the transport route with different set speeds. can be carried out smoothly. Furthermore, in the horizontal curve path portion, each rotational drive shaft 4
A pair of left and right friction drive wheels 19a to 19d attached to
The friction drive wheels located on the outside are fixed to the rotary drive shaft 4, and the friction drive wheels located on the inside are of the above-mentioned friction type, thereby reducing the speed difference between the outer and inner parts. This allows the pallet 1 to travel smoothly by absorbing it.

If the conveyance path has a vertically inclined path portion, that is, an upward slope portion or a downward slope portion, a friction drive wheel 19b using a pinion gear is attached to each rotary drive shaft 4 in this path portion.
By attaching the pallet 1 at a position where it engages with the rack gear 16b for the vertically inclined path section, the pallet 1 can be safely and forcibly propelled at a predetermined speed without causing slippage.

By using a friction type low-speed friction drive wheel 19a in the storage line or temporary stop work area of pallet 1, pallet 1 can be stopped automatically and safely with a stopper that can be opened and closed, and the following pallet 1 can be stopped automatically. can be automatically stopped in a state connected to the preceding stop pallet 1.

Note that the driving means 6 for driving each rotary drive shaft 4 in the same direction at a constant velocity is not limited to that of the above embodiment. For example, the driving means 20 of the embodiment shown in FIG. 5 has a timing belt pulley 21 fixed to one end of each rotary drive shaft 4, and an endless driving timing belt 22 (return side not shown) on each pulley 21
By increasing the contact circumference of the timing heald 22 with each pulley 21 by pressing downward with a tensioner (idling pulley) 23 disposed between them, and rotating the timing belt 22 with a driving pulley (not shown),
The rotary drive shafts 4 are configured so that they can be driven in a constant-velocity interlocking manner in the same direction.

(Effects of the Invention) According to the conveyance device of the present invention that can be implemented as described above, the rotational speed of the rotary drive shaft can be changed by simply selecting the diameter of the friction drive wheel attached to each rotary drive shaft from a plurality of types. The moving speed of the conveying movable table can be arbitrarily set from among a plurality of types without any problems and while maintaining the height of the conveying movable table constant. Of course, it is also possible to set zones with different conveyance speeds on one continuous conveyance path, and the length and position of these zones with different conveyance speeds can be changed very easily. Furthermore, it can be implemented at a lower cost than a method in which the rotational speed of the rotary drive shaft is changed for each section where the conveyance speed differs.

[Brief explanation of the drawing]

Figure 1 is a vertical front view, Figure 2 is an enlarged vertical front view of the main parts,
FIG. 3 is a longitudinal side view, FIG. 4 is a schematic diagram illustrating the hanging state of the endless driving rope, and FIG. 5 is a side view showing another embodiment. 1...Barlet (transportation platform), 2.3...Friction rail for driven, 4...Rotation drive shaft, 6.20...
Drive means, 8... Drive main shaft, 9.11... Drive sheave, 10.12... Idle sheave, 13... Endless drive rope, 16a-16b... Friction rail surface (16b
...Rack gear), 198-19d...Friction drive wheel (19b...Pinion gear), 21...Timing belt gear

Claims (1)

[Claims] A conveyance movement movable along the conveyance path, which is provided with driving means that supports rotational drive shafts in a transverse direction at regular intervals along the conveyance path and drives each rotary drive shaft in the same direction at a constant speed. A driven friction rail having a plurality of rows of friction rail surfaces with different intervals from the rotary drive shaft is attached to the bottom of the stand along the moving direction, and each rotary drive shaft is provided with a driven friction rail. A conveying device comprising a friction drive wheel having a diameter that contacts one of the friction rail surfaces of a friction rail.