JPS6139247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In conveying pallets that can be coasted, the present invention interlocks a high-speed drive roller and a low-speed drive roller on a movable frame by one motor, and operates the movable frame using a switching actuating device. A pallet drive unit that can obtain three states of high-speed drive, low-speed drive, and no drive is arranged along the path of the pallet, and the pallet can be restarted at high speed after stopping. Another object of the present invention is to easily switch to low speed and coasting before stopping the pallet, thereby greatly reducing the impact caused by a stopper or the like when the pallet is stopped.

The embodiments shown in the drawings will be described below. For example, as shown in FIGS. 6 and 7, a pallet conveying device that can coast is equipped with rollers a for traveling at the bottom of a pallet 1, and rolls on a flat part b of a conveyor frame 2. A conveyor of the type that runs on the pallet side, or as illustrated in FIG. There is a type of conveyor made in Japan.

In conveying this type of coast-running pallet 1, pallet drive units D configured as described below are arranged at appropriate intervals in the path of the pallet 1, that is, inside the conveyor frame 2. Accordingly, the pallets 1 are sequentially advanced by the operation of the drive unit D.

Figures 1 to 4 show this pallet drive unit D, in which a movable frame 5 is swingably attached to a mounting base 3 formed to be fixed to the conveyor frame 1 or other fixed part with a support shaft 4. The movable frame 5 has shafts 6 at both front and rear ends of the upper part thereof.
and 7, a high-speed pallet drive roller 8 and a low-speed pallet drive roller 9 are installed, respectively. This high speed roller 8 has a small diameter pulley 10.
In addition, a pulley 11 with a larger diameter than this is attached to the low-speed roller 9 as shown in FIG.
By providing a transmission pulley 13 rotated by a transmission pulley 2 and interlocking each pulley 10, 11, 13 with a transmission medium 14 such as an endless belt,
By sharing one motor 12, the pulley 10 is rotated at a high speed, and at the same time, the other pulley 11 is rotated at a low speed. Therefore, if the movable frame 5 is tilted to one side about the support shaft 4 (Fig. 5), the high-speed roller 8 will come into pressure contact with the lower surface of the pallet 1, so the pallet 1 will be fed quickly, and on the contrary, it will be tilted to the other side. If (Fig. 5) the low speed roller 9 comes into contact with the lower surface of the pallet 1, the pallet 1 can be switched to be fed at a slow speed, and if the movable frame 5 is kept in the neutral position (Fig. ) Since both rollers 8 and 9 are maintained in a separated state where they do not come into contact with the lower surface of the pallet 1, they are in a non-driven state. Therefore, when the neutral state is reached, the switch opens and the motor 12
It is a good idea to cut off power to the device and configure it to save power consumption.

As described above, in order to switch the position of the movable frame 5 in three ways, a switching actuating device is attached, and the actuating device may be an electromagnetic solenoid or a pneumatic device, etc. Drive units 15 and 16 which operate by fluid operation are installed oppositely, and their operating rods 17 and 18 are connected to springs 19 and 18, respectively.
When the actuator 15 or 16 operates, the movable frame 5 is moved to one side or the other side via the operating rod 17 or 18 and the spring 19 or 20 attached thereto, as shown in FIG. The drive roller 8 or 9 on the desired side is brought to the operating position by tilting the drive roller 8 or 9. Note that 21 is a spring connected to the central portion of the mounting base 3 and the movable frame 5.

When conveying a normal pallet 1, the movable frame 5 is in an inclined position as shown by the solid line in FIG. 4, with the high-speed roller 8 being at the upper position and the low-speed roller 9 being at the lower position. Therefore, even if both rollers 8 and 9 are driven by the motor 12 at the same time, the low-speed roller 9 does not come into contact with the pallet 1, and only the high-speed roller 8 comes into contact with the underside of the advancing pallet 1. Transfer force is transmitted to 1. Therefore palette 1
are intermittently driven one after another at a high speed by a high speed roller 8 of a drive unit D disposed within the conveyor frame 2. In order to stop the pallet 1 during conveyance, when the stopper S installed at the stop position operates to the stopped state, the driver 15 of the drive unit D located in front of the stopper operates in conjunction with this to move the movable frame 5 to the first position. Since the high-speed roller 8 is lowered and the low-speed roller 9 is raised by switching the displacement as shown by the chain line in Figure 4, the pallet 1, which has been conveyed at a high speed by the high-speed roller 8, is now transported at a low speed. Finally, the unit D just before the stopper displaces the movable frame 5 to a neutral state, so that both rollers 8 and 9 are separated from the lower surface of the pallet and coasting. The pallet 1 that is being moved quietly hits the stopper s and comes to rest. Further, when the pallet 1 is to be started again, the high-speed rollers 8 of the movable frame 5 come into contact with the lower surface of the pallet in conjunction with the release of the stopper, so that the pallet can be started rapidly.
As described above, it is appropriate to design such that the displacement of the movable frame 5 and the stopping and moving of the drive motor 12 due to the operation of the drivers 15 and 16 are performed in electrical connection with the operation of the stopper s.

Since the present invention is configured as described above, the pallet drive unit D can be placed at the location where it is required to be driven, so there is no need to use a long conveyor belt or chain, and only the frame 2 can be moved to the required length. By assembling them, it is possible to easily configure a conveyor with different lengths and shortcomings, and the width of the conveyor can also be conveniently changed to suit the size of the pallet. Furthermore, for conveyance of the pallet 1, the unit D is equipped with a high-speed roller 8 and a low-speed roller 9, which are driven and stopped simultaneously by a common motor 12.
Since these rollers 8, 9 are constructed so as to be able to be switched to three different positions by means of a switching actuating device, the pallet 1 can be fed at high speed, fed at low speed, and in a non-driven state, so that the pallet 1 can be moved at high speed. When stopping the pallet 1, the pallet 1 is first decelerated to a low speed, and finally, due to inertia, it quietly hits the stopper and stops, which greatly reduces the shock at the time of stopping. Rapid restart after stopping is also possible. In addition, the driving force can be reduced to zero while the pallet is stopped, and the device of drive unit D can be increased or decreased as necessary, and its location can be freely chosen. Stopping the pallets saves energy as a whole, since power is not wasted, and since the drive unit D has a simple structure, it is advantageous in that it produces less noise as a conveyor.

[Brief explanation of the drawing]

The drawings show an embodiment of a driving device for an intermittent drive conveyor according to the present invention, and FIG. 1 is a front view showing a pallet driving unit thereof. Figure 2 is a rear view. FIG. 3 is a top side view. 4 is a front view showing a state in which the movable frame is displaced from the neutral position shown in FIG. 1; FIG. FIG. 5 is an explanatory diagram showing three types of displacement of this movable frame. FIG. 6 is a partial plan view showing an example of an intermittent drive conveyor configured by disposing an upper pallet drive unit. FIG. 7 is a front view schematically showing the relationship between the pallet and the drive unit. Figure 8 shows
FIG. 7 is a plan view showing another embodiment. 1...Pallet, 2...Conveyor frame, 3
...Mounting base, 4...Spindle, 5...Movable frame, 8
...High speed roller, 9...Low speed roller, 10...
...Small diameter pulley, 11...Large diameter pulley, 12...
...Drive motor, 13...Transmission pulley, 14...
Transmission medium, 15, 16...Driver, 17, 18...
...Operating rod, 19, 20, 21... Spring, D... Pallet drive unit.

Claims (1)

[Claims] 1 Pallet driving rollers each having a small-diameter pulley on one side and a large-diameter pulley on the other side are provided at both front and rear ends of a movable frame supported movably with respect to a mounting base, and these rollers with different diameters By simultaneously rotating both pulleys from a motor attached to the movable frame via a transmission medium, one roller can be rotated at high speed and the other roller at low speed, and the mounting base and movable frame can be rotated simultaneously. A pallet drive unit is connected with a switching actuator and is configured to hold the movable frame in three selected positions: neutral and left/right tilted, and is appropriately arranged within the conveyor frame along the path of the pallet. A drive device for an intermittent drive conveyor.