JP2640286B2 - Shedding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to separate conveyed objects (comprised of pallets and loads) that have been stacked and conveyed in a plurality of stages one by one in a conveyance line. The present invention relates to a step separating device.

2. Description of the Related Art Conventionally, as this type of device, for example,
The structure found in the 8179 publication is provided. That is, a support frame is erected on the side of the delivery conveyor, and an elevating frame that is supported and guided by the support frame is provided.
A fork, which is supported and guided by the lifting frame side, is provided above the conveyor so as to be able to move back and forth.

The conveyor conveys the pallet and the load as a set in a two-stage stack and stops against the support frame. Next, the fork at the retracted position is moved up and down together with the lifting frame to face the upper pallet. In this state, the fork is advanced (projected) to engage with the pallet. Next, the lifting frame is lifted to lift the upper pallet and the load. After the lower pallet and the load are conveyed to the lower side by the conveyor, the lifting frame is lowered to unload the upper pallet and the load. Next, after the fork is retracted and extracted from the pallet, the upper pallet and the load are conveyed to the lower side by the conveyor.

Problems to be Solved by the Invention According to the above-mentioned conventional type, since the shape of the load, that is, the height is constant, a smooth step can be performed by a simple operation set by the fork, but the height of the load varies. In such a case, the fork cannot be easily positioned with respect to the upper pallet, the fork collides with the load or the pallet, or the forklifting operation cannot be performed efficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide a leveling device that can always perform a leveling operation accurately and efficiently.

Means for Solving the Problems In order to achieve the above object, a step-down device according to the present invention is configured to lift a group of conveyed objects in a line for conveying conveyed objects composed of pallets and loads in a plurality of stages. A device is provided, and a clamp device is provided on a side portion of the lift path, the clamp device being capable of being disengaged from a pallet of an upper conveyed object.
It is composed of a sensor arm facing the pallet prior to the engagement movement of the clamp arm, and a drive shaft on which these arms are mounted.

Operation According to the configuration of the present invention, in a state where the conveyed objects stacked in a plurality of stages are stopped above the lift device, first, the sensor arm is moved via the drive shaft to have the operation posture facing the pallet. Since this sensor arm moves ahead of the clamp arm, the clamp arm is in the disengaged position. The sensor arm is a clamp arm,
When the lower load is at the maximum height, it is set at a level facing the lower part of the upper load, so that the sensor arm detects the upper load but does not detect the upper pallet. In this state, the lifting device is raised to lift the transported object group. Thus, when the upper pallet ascending faces the sensor arm, the lift device is stopped based on the detection of the pallet by the sensor arm, and the clamp arm is engaged with the clamp arm via the drive shaft. After the clamp arm is engaged with the pallet, the conveyed object group is lowered by lowering the lift device.When the lower pallet is slightly lowered, the upper pallet is received by the clamp arm. Only the lower transported object is lowered. The lower transported object is returned to the transport line,
It is transported to the poor. Then, the upper transported object can be returned to the transport line by slightly lifting the upper transported object by the lifting operation of the lift device and lowering the lift device in a state where the clamp arm is disengaged.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The transported objects 1A and 1B handled here are composed of pallets 2A and 2B and loads 3A and 3B, respectively, and are in a form that can be stacked. A carry-in conveyor 4 for stacking and transporting the two conveyed objects 1A and 1B, and a working unit conveyor 5 at a place where the objects are separated.
The unloading conveyor 6 for transporting the transported objects 1A and 1B separately after being separated from each other is linearly arranged.
Is formed. Each of the conveyors 4, 5, and 6 is of a chain type, a roller type, or the like, and is individually or comprehensively controlled for driving and stopping. At the place of the working unit conveyor 5, a lift device 10 that acts on the stacked conveyed objects 1A and 1B is provided. The lift device 10 includes a base member 11
And a table 13 disposed above the base member 11 via a pandagraph mechanism 12, an actuator 14, and the like. The base member 11 is fixed to a machine frame 15 arranged from the lower side of the working unit conveyor 5 to both sides.

A clamp device 20 is provided on the side of the lift path 16 by the lift device 10 so as to be detachable from the pallet 2A of the upper transferred object 1A. The clamp device 20 is divided so as to act on a total of four places on both sides of the front end and both sides of the rear end of the pallet 2A. A pair of upper and lower bearings 22 is provided on the upper part of the machine frame 15 via a bracket 21, and a drive shaft 24 supported by these bearings 22 and rotatable about a vertical axis 23 is provided. A motor 25 with a speed reducer is attached to a lower portion of the bracket 21, and an upward output shaft 26 and a lower end of the drive shaft 24 are connected via a coupling 27. Double bearing 22
In the meantime, a clamp arm 29 is fixed to the drive shaft 24 via a key 28 or the like. The clamp arm 29 extends in the lateral direction, and its tip is bent 90 degrees in the lateral direction to engage therewith. This is the part 29a. The bracket 21 is provided with a stopper portion 30 for regulating the position of the home position 43, which is the most retracted after the clamp arm 29 is detached. A sensor arm 32 is swingably mounted on an upper portion of the drive shaft 24 via a bearing 31. Here, a pair of front and rear sensor arms on the left side with the transport line 7 in the middle
32 form a set, and a pair of right and left sensor arms 32 on the right side form a set. In each set, a light emitter 34 and a light receiver 35 are provided at a free end of one sensor arm 32 via a bracket 33, and a reflector 37 is provided at a free end of the other sensor arm 32 via a bracket 36. Provided. Further, the sensor arm 32 is set to face the pallet 2A prior to the engagement movement of the clamp arm 29. That is, at the base of the sensor arm 32, an arc-shaped long hole 38 centered on the vertical axis 23 is provided.
Are formed over approximately 90 degrees, and a pin 40 that fits into the elongated hole 38 is provided on a support 39 that is provided continuously from the drive shaft 24. Further, in order to regulate the position where the sensor arm 32 is rotated 45 degrees from the home position 43 and correctly faces the pallet 2A, a stopper plate 41 for receiving the sensor arm 32 is provided.
Is provided on the bracket 21 side. A spring 42 for urging the sensor arm 32 to swing to the detection operation position is provided between the sensor arm 32 and the stopper plate 41. When the clamp arm 29 is in the home position 43, the slot 38 on the side opposite to the direction of rotation by the spring 42.
The pin 40 is set so as to be located at the back.

Next, a description will be given of the work of unloading the transferred object in the above embodiment.

The stacked articles 1A and 1B are unloaded from the truck by making the fork of the forklift car act on the lower valley 2B, and then delivered to the start end of the transport line 7. Then, the sheet is conveyed on the conveying line 7 in a stacked state, and is transferred from the carry-in conveyor 4 to the working unit conveyor 5. At this time, in the lift device 10, the table 13 is moving down. Further, in the clamp device 20, since the drive shaft 24 is rotated to the non-operating side via the motor 25, the clamp arm 29 is connected to the home position 43 in contact with the stopper 30 as shown in FIG. Position, and the pin 40 integrated with the drive shaft 24 is rotated by engaging with the deep portion of the long hole 38, so that the sensor arm 32 swings against the spring 42. In working position. In such a state, the transported objects 1A and 1B are transported as described above, and stopped above the lift device 10. Next, first, the drive shaft 24 is rotated 45 degrees in the operation direction. Thereby, as shown by the solid line in FIG. 6, the clamp arm 29 is set at 45 degrees with respect to the home position 43, that is, θ.
_Although rotated once, the engagement portion 29a is still at the non-engagement position. The pin 40 integral with the drive shaft 24 also rotates 45 degrees around the longitudinal axis 23, so that the sensor arm 29, whose rotation has been restricted by the pin 40, is vertically moved by the urging force of the spring 42. It rotates around the axis 23 and comes into contact with the stopper plate 41. As a result, each sensor arm 32 is in the operating position facing the pallet 2A, and the light emitter 34 and the light receiver 35 face the reflection plate 37. The clap arm 29 and the sensor arm 32 are set at a level facing the lower part of the upper load 3A when the lower load 3B is at the maximum height, for example, so that the sensor arm 32 in the working posture is The upper load 1A is detected but the upper pallet 2A is not detected. That is, the optical axis from the projector 34 contacts the load 3A and does not reach the reflector 37. In this state, the lift device 10 is actuated to raise the table 13 to lift both the conveyed objects 1A and 1B via the lower pallet 2B. When the upper pallet 2A ascending faces the sensor arm 32, the optical axis passes through the upper pallet 2A,
Then, the reflected light after colliding with the reflection plate 37 enters the light receiver 35. Based on this detection, the lift device 10 is stopped, the drive shaft 24 is driven again in the operation direction, and the clamp arm 29 is rotated, so that the engagement portion 29a is rotated as shown by the phantom line in FIG. Engage the upper end of the pallet 2A. At this time, the rotation of the sensor arm 32 is prevented by the contact with the stopper plate 41, so that the pin 40 moves in the long hole 38.

Clamp arm for pallet 2A as described above
After the engagement of 29, the conveyed objects 1A and 1B are lowered by lowering the lift device 10, but the lower pallet 2A is received by the clamp arm 29 when slightly lowered. Thereafter, only the lower transported object 1B is lowered. The transported object 1B at the lower stage is returned to the working unit conveyor 5, and is transferred to the lower side on the transport line 7. Thereafter, the upper transported object 1A is slightly lifted by the lifting operation of the lift device 10, and the drive shaft 24 is operated in the reverse direction to disengage the clamp arm 29 and the sensor arm 32, and return to the state shown in FIG. . Next, by lowering the lift device 10, the transported object 1 </ b> A in the upper stage is returned to the working unit conveyor 5, and is transported downward on the transport line 7. Thus, the step-off work is completed.

In the above embodiment, the clamp device 20 is fixed to the machine frame 15 side, but this may be such that the vertical position with respect to the machine frame 15 can be freely changed. Although the transported objects 1A and 1B are shown in the form of a two-stage stack, more stages can be similarly performed.

Effect of the Invention According to the present invention having the above-described structure, the clamp arm is actuated after the conveyed object group is raised to detect the upper pallet by the sensor arm, so that the height (shape) of the load is increased.
However, even if it is various, the unraveling operation can always be performed accurately and efficiently. Further, by mounting the clamp arm and the sensor arm on the same drive shaft, the whole can be compactly assembled.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a plan view, and FIG.
FIG. 3 is a front view, FIG. 3 is a side view, FIG. 4 is a partially cutaway front view of the clamp device, and FIGS. 5 and 6 are partially cutaway plan views showing the same operation state. 1A, 1B …… Conveyed object, 2A, 2B …… Pallet, 3A, 3B ……
Load, 5 Work section conveyor, 7 Transfer line, 10
Lifting device, 13 ... Table, 16 ... Lift path, 20 ...
... clamping device, 23 ... vertical axis, 24 ... drive shaft, 25 ...
Motor with reduction gear, 29 ... Clamp arm, 29a ... Engagement part, 30 ... Stopper part, 32 ... Sensor arm, 34 ... Projector, 35 ... Receiver, 37 ... Reflector, 38 ... Slot, 40 ...
... Pin, 41 ... Stopper plate, 42 ... Spring, 43 ... Home position.

Claims (1)

(57) [Claims] An apparatus for lifting a group of conveyed objects is provided in a line for conveying conveyed objects composed of pallets and loads in a plurality of stages, and an upper-stage conveyed object is provided on a side portion of the lift path. The pallet is provided with a detachable clamp device, and the clamp device is attached to the pallet with a clamp arm, a sensor arm facing the pallet prior to the engagement movement of the clamp arm, and the mounting of these arms. A step-off device, comprising: a drive shaft;