JPH027841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a storage shelf equipped with a free roller conveyor with a gentle upward slope, in which pallets are sequentially pushed from below, and the lowest pallet is locked to a stopper and stored. This invention relates to a pallet loading/unloading device.

As shown in FIG. 1, the storage shelf 1 is usually provided in a multi-tiered manner with its lower end facing the lift 2, and the lifting/unloading device 3 provided on the lift 2 also has a free roller conveyor 4 of the storage shelf 1. Free roller conveyors 5 having the same slope are provided, and when both free roller conveyors 4 and 5 are aligned with no difference in level, pallets are transferred between them. In this case, the pallets that are sequentially pushed into the storage shelf 1 from the loading/unloading device 3 are stopped by a stopper 6 and heated to a high temperature. As the pallet moves forward, the stopper 6 is brought down and the pallet is transferred to the loading/unloading device 3.

Such a loading/unloading device 3 was already introduced in the Japanese public sector in 1983.
As disclosed in Japanese Patent No. 49956, this conventional device transfers a pallet from the storage shelf 1 to the loading/unloading device 3 by natural descent due to the full weight of the pallet and the loaded object. When the free roller conveyor 5 stops higher than the free roller conveyor 4, or when the free roller conveyor 44
If the rotational friction of the rollers is large, there is a disadvantage that the pallet cannot be smoothly lowered into the loading/unloading device 3.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for loading and unloading pallets into a pallet storage shelf, which is equipped with a free roller conveyor, which eliminates the above-mentioned drawbacks of the conventional pallets by providing a pull-out device that engages with the stored pallets and actively pulls them out. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Illustrated embodiments of the invention will be described below. 2 and 3, the loading/unloading device 3 includes a free roller conveyor 5 provided at the front of a frame 7, a hydraulic cylinder 9 pivotally supported on the frame 7 by a trunnion 8, and a movable cylinder 9 that is driven back and forth by this. The movable frame 10 has guide rollers 11 provided on both sides thereof that are fitted into vertical grooves of the frame 7 to be guided and supported, and fixed to the lower part of the front pusher plate 12 that constitutes the movable frame 10. Connecting fittings 13
is connected with a pin to the rod of the hydraulic cylinder 9 and is moved back and forth.

The pusher plate 12 has a pusher 14 fixed to both sides of the front part, and a support frame 17 on which rollers 16 are fitted and guided by guide rails 15 fixed to the pusher plate 12, and the front end is connected to the support frame 17. I did 1
The pair of rods 18 extend rearwardly through holes in a bearing member 19 fixed to the frame 7.
Stop pieces 20 and 2 are provided at the front and rear ends, respectively.
1 is fixed.

Each rod 18 is provided with a pair of recesses 22 and 23 having a predetermined interval l (50 mm), and a lock member 24 fixed to the pusher plate 12 is provided with a lock ball that presses into the recesses 22 or 23. Therefore, the support frame 17 is pushed against the movable frame 1 by the pressing engagement.
The movable frame 1 can move forward and backward with 0.
Before the movable frame 10 reaches the most retracted standby position shown in the figure, the stop piece 20 contacts the bearing member 19 to engage the lock ball in the recess 23, and before the movable frame 10 reaches the front end stop position, the stop piece 20
1 comes into contact with the bearing member 19, causing the lock ball to come out of the recess 23 and engage with the recess 22.

A stopper pushing member 26 is supported on the front part of the support frame 17 by a hinge 25 so as to be able to swing up and down, and the support frame 1
The lower surface of the stopper pushing member 26 is supported in parallel with the pusher plate 12 by a locking metal fitting 27 fixed to the stopper member 7 .
In this state, the lower surface projects slightly below the pusher plate 12, and a notch is provided in the front of the pusher plate 12 to allow the stopper pushing member 26 to retreat.

4 and 5 show details of the stopper pushing member 26, with support metal fittings 28 on both sides of the stopper pushing member 26.
and the stopper 29 at the front of the support fitting 28.
The rear end of the arm 31 is pivotally supported by a pin 30 inserted through the pin 30, and the coil spring 32 allows the arm 31 to be attached to the stopper 2.
9 and urges it to be parallel to the pusher plate 12. A drawer fitting 34 is installed in the split groove 33 of the arm 31.
is inserted and its tip is pivoted with a pin 35, and the bolt 36 attached to the drawer fitting 34 hits the stopper fitting 37 fixed to the arm and the upper surface of the arm 31, thereby limiting the rotation range of the drawer fitting 34. do.

The lower edge of the drawer fitting 34 is connected to the arm 31 at the solid line position shown in the figure, where the bolt 36 is in contact with the upper surface of the arm.
It protrudes triangularly from the lower surface of the blade, and its leading edge 38 has a relatively small inclination, and its trailing edge 39 forms a steep slope with a vertical angle of approximately 30 degrees in the figure.

The pallets 40 that are taken in and out of the storage shelf 1 by the loading/unloading device 3 are placed on a peripheral wall 42 that is shallowly raised around a substantially square bottom 41, as shown in FIGS. 6 and 7.
The center portions of the four sides are inwardly recessed to form a recess 43 into which the stopper pushing member 26 can enter, and both side portions of the recess 43 are used as contact surfaces 44 of the pusher 14. Further, an engagement wall 45 higher than the recess 43 is fixed in contact with the inner surface of the peripheral wall 42, and a heavy object 47 such as an engine is placed on a pedestal 46 provided on the bottom 41.

A stopper 6 is pivotally supported at the lower end of the storage shelf 1 by a pin 48 so as to be freely raised and lowered, and a roller 49 is attached to the tip thereof. The stopper 6 is biased in the upright direction by a weight 50, and in the upright state engages the pallet recess 43 to hold the pallet 40 on the storage shelf 1.

Next, the operation of the present invention will be explained.

(1) Pallet loading process When the loading/unloading device 3 is in the standby state shown in FIG.
0 and the loading/unloading device 3 to the storage shelf 1 at the desired height.
be consistent with When the hydraulic cylinder 9 is extended and the movable frame 10 and the stopper pushing member 26 are moved forward, the front edge 38 of the drawer fitting 34 first comes into contact with the pallet engaging wall 45 and rotates upward. Get over it and enter Palette 40. Then, the pusher 14 comes into contact with the abutment surface 44 to advance the pallet 40. In this case, the stopper pushing member 26 protrudes forward from the pusher 14 by an amount a (30 mm), and the protruding amount a is the distance from the pallet recess 43.
Since the depth b (35 mm) is smaller than the depth b (35 mm), a small gap (ba) exists between the stopper pushing member 26 and the pallet 40.

The pallet 40 is the pallet 40a on the storage shelf 1.
When the pallet 40 comes into contact with and is pushed, the pallet 40 collapses the stopper 6 due to its own weight and enters the storage shelf 1. Before the movable frame 10 reaches the predetermined forward end, the stop piece 21 stops the bearing member 19.
The stopper pressing member 26 is stopped at this time, but
The pusher 14 further advances by l, reaches the forward end, and is stopped by the limit switch. At this time, the lock ball of the lock member 24 engages with the recess 22, and the engagement wall 45 is moved forward by the distance l.
is in contact with the rear edge 39 of the drawer fitting and the stopper pushing member 2
The whole part 6 is rotated upward and removed to the front of the drawer fitting 34.

When the pusher 14 stops, there is a gap between the pallet recess 43 and the stopper pushing member 26.
A wide space of 55 mm is created, and the stopper 6 can easily stand up in this space, and then the pallet 40 is locked by the pusher 14 retreating.

Before the hydraulic cylinder 9 is shortened and the pusher 14 reaches the most retracted position, the stop piece 20 hits the bearing member 19 and stops the stopper pushing member 26, and when the pusher 14 is further retreated by l,
The hydraulic cylinder 9 is stopped by the limit switch. At this time, the lock ball engages with the recess 23.

(2) Pallet unloading process The movable frame 1 is moved by the extension of the hydraulic cylinder 9.
0 moves forward from the standby state, first, the front edge 38 of the drawer fitting hits the engagement wall 45 of the pallet 40a on the storage shelf 1, and slides on the engagement wall 45 while rotating the drawer fitting 34 upward. move. Next, when the stopper pushing member 26 reaches the position of the stopper 6, the stopper 6 cannot fall down due to the downward contact pressure of the pallet 40a, so the stopper pushing member 26 rides on the roller 49 of the stopper 6 and moves to the position indicated by the chain line in FIG. tilt. Before the stopper pushing member 26 hits the pallet recess 43, the pusher 14 comes into contact with the pallet abutting surface 44 to advance the pallet 40a. As a result, the stopper 6 becomes able to fall down and is brought down by the weight of the stopper pushing member 26, and the drawer fitting 34 climbs over the engagement wall 45 and descends inside thereof.

Then, when the hydraulic cylinder 9 is shortened, the pallet 40a is lowered by the downward force due to its own weight while remaining in contact with the pusher 14, or the free roller conveyor 5 is slightly higher than the free roller conveyor 4 of the storage shelf 1. If the pallet 40a cannot be lowered due to its own weight for some reason, the rear edge 39 of the drawer fitting engages with the engagement wall 45 to pull out the pallet 40a. Engagement wall 4 when pulling out
5 attempts to rotate the arm 31 upward via the drawer fitting 34, but the arm 31 has a large resistance to upward tilting and will not tilt upward due to the pallet pullout force. Further, since the stopper pushing member 26 is moved back into the pallet recess 43, the stopper 6 does not stand up while the pallet is being pulled out. After the movable frame 10 is stopped by the limit switch at the backward end, the drawer fitting 38 is tilted upward to remove the pallet 4.
Take out 0a.

The present invention has the above configuration, and even if the rotational friction of the rollers of the free roller conveyor of the storage shelf is large,
Alternatively, even if the loading/unloading device stops a little higher than the storage shelf, it has the effect of being able to actively pull out the storage pallet onto the loading/unloading device. However, according to the present invention, the pallet is pulled out with the stopper pushing member sufficiently inserted into the pallet recess, so that the stopper is effectively prevented from rising up and the pallet can be pulled out smoothly. .

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic elevational view of a lift having the device of the present invention, FIG. 2 is a plan view, FIG. 3 is an elevational view, and FIG. 4 is a plan view of essential parts. , Figure 5 is an elevation view of the main part, Figure 6 is a plan view of the pallet,
FIG. 7 is also an elevational view. 1... Storage shelf, 3... Pallet loading/unloading device, 4, 5
...Free roller conveyor, 6...Stopper, 7...Frame, 9...Drive mechanism, 10...Movable frame, 1
4... Pushya, 17... Support frame, 18... Rod, 1
9... Bearing member, 20, 21... Stop piece, 22,
23... Recessed portion, 24... Lock member, 26... Stopper pushing member, 31... Arm, 34... Drawer fitting, 38...
Front edge, 39... Rear edge, 40... Pallet, 40a... Storage pallet, 43... Recess, 44... Contact surface, 45...
Engagement wall.

Claims (1)

[Claims] 1. It has a free roller conveyor with an upward slope and a stopper that is biased in the upright direction at the lower end and can be raised up and down, and the pallets that have a recess in the front where the stopper locks are stored side by side in front and back. A device for carrying pallets into and out of storage shelves includes a frame having a free roller conveyor aligned with the same slope as the free roller conveyor at the front, and a movable frame guided and moved on the frame in parallel with the free roller conveyor by a drive mechanism. a pusher provided at the front end of the movable frame and in contact with the pallet contact surface; a support frame having a rod that is guided and supported by the front part of the movable frame so as to be movable back and forth and extends rearward through a bearing member fixed to the frame; A stopper pushing member that is pivotally supported by the front part of the support frame so as to be prevented from downward tilting and can enter into the recess of the pallet, and a pair of recesses provided on the movable frame and formed on the rod at a predetermined distance 1. a lock member that is removably engaged with the rod and moves the stopper pushing member together with the movable frame; and a lock member that is fixed to the rod in front and rear of the bearing member and located l before the movable frame reaches the forward end and the backward end. a stop piece that switches a recess to be engaged with the stopper; and an arm that protrudes forward from the stopper pushing member and higher than the pallet engaging wall, and has a rear end that is pivotally supported by the stopper pushing member to prevent downward rotation, and is provided with a downward rotational force. , the front end is pivoted to the front part of the arm to limit the vertical movement angle, and at the lower limit rotation position, the slightly sloped front edge and the steeply sloped rear edge form a triangular shape and protrude downward from the arm, and the rear edge engages. When the movable frame moves forward, the stopper pushing member protrudes from the pusher by a dimension smaller than the depth of the pallet recess, and when the pusher comes into contact with the contact surface of the storage pallet. When the front edge of the drawer fitting moves over the engagement wall while tilting the arm upward, the stopper pushing member lowers the stopper, and when the pusher pushes the pallet into the storage shelf, the pusher moves l after the stopper pushing member stops. A device for carrying pallets into and out of a pallet storage shelf, which is equipped with a free roller conveyor that moves forward and projects forward from a pusher member.