JPH0929580A - Pallet carrying-in/out device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the width of a path during reciprocal movement of a loader hook while increasing the degree of intrusion of the loader hook into a machine tool. SOLUTION: In a pallet carrying in/out device 1 for transferring pallets A, B between the inside of a machine tool and a planing position outside of the machine tool, a pair of sprocket wheels 5, 6 are arranged in a carrying in/out direction of the pallets A, B, and a chain 7 as a winding member is stretched between and wound on the sprocket wheels 5, 6. Further, a lever 8 is turnably attached at its center to a fulcrum pin fixed to the chain 7. Further, one end part of the lever 8 is movable along a straight guide in the loop of the chain 7, and the other end part of the lever 8 is provided thereto with a loader hook 21 which is disengageably engaged with pallet hooks 22 of the pallets A, B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for loading and unloading a pallet between a machine tool and a setup position outside the machine tool.

[0002]

2. Description of the Related Art A chain type pallet loading / unloading device is
An endless chain is driven between the machine tool and the setup position outside the machine, and a pallet is loaded or unloaded by a loader hook fixed to the chain. Here, if the amount of entry of the loader hook into the machine tool is set to a large value, the width of the path when the loader hook reciprocates increases accordingly, which increases the opening amount of the cover of the machine tool and the width of the device. However, it becomes difficult to install in a narrow space.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to increase the amount of entry of a loader hook into a machine tool while reducing the path width of the loader hook during reciprocal movement.

[0004]

In view of the above object, the present invention relates to a pallet loading / unloading device for loading / unloading a pallet between the inside of a machine tool and the outside setup position, and a sprocket as a pair of wheels in the loading / unloading direction of the pallet. Place the wheel, wrap the chain as a wrapping body between both sprocket wheels, rotatably attach the center of the lever with the fulcrum pin fixed to the chain, and attach one end of the lever to the straight line between the chains The loader hook for the machine tool is configured to be movable along the guide and provided with a loader hook at the other end of the lever, and the loader hook is detachably engaged with the pallet hook of the pallet. While increasing the entry amount of
The path width for the reciprocating movement of the loader hook is set small.

[0005]

1 to 4 show a pallet loading / unloading device 1 of the present invention. The pallet loading / unloading device 1 has a pair of pallets A and B alternately loaded and unloaded between the machining table 3 inside the machine tool 2 and the setup table 4 outside the machine tool 2, for example. Sprocket wheels 5, 6, these sprocket wheels 5,
A chain 7 as an endless winding body wound around 6 and a lever 8 fixed to the chain 7.
It is assembled by etc.

The pair of sprocket wheels 5 and 6 are fixed to the frame 9 by vertical shafts 13 and 14, and one shaft 14 of the sprocket wheels 5 and 6 is moved by the drive unit 10 in response to loading and unloading of the pallets A and B. It is designed to be driven in the direction of. The chain 7 is wound around the sprocket wheels 5 and 6 as an endless shape, and the lever 8 is U-shaped when viewed from the side, and is rotated with respect to the chain 7 by a fulcrum pin 15 at the center position. It is movably connected.

The other end of the lever 8 is connected to a guide 17 by a vertical pin 16. The guide 17 is provided on a straight line connecting the shafts 13 and 14 with a horizontal guide roller 19 and a vertical guide roller 20 with respect to a guide rail 18 as a linear guide integrated with the frame 9.
Can be moved by. Also, lever 8
The other end of the upper side of the pallet is a loader hook 21, which is engaged with the groove 22a of the pallet hook 22 fixed to the pallets A and B by the hook pin 21a from the side. .

Here, as shown in FIGS. 5 and 6, the position of the loader hook 21 is the dog 24 of the gear 23 that makes one rotation corresponding to one revolution of the chain 7, and the limit for detecting the forward position of the pallet A. Switch 25, limit switch 26 for detecting standby position, limit switch for detecting backward position, limit switch 28 for detecting forward position of pallet B, limit switch 2 for detecting standby position
9. The limit switch 30 for detecting the backward position is detected.

The machine tool 2 is covered with a cover 11, and the pallets A and B can be taken in and out by opening and closing a door 12 provided at the opening of the cover 11. And sprocket wheel 5
Is provided near the opening opened by the door 12. Further, roller conveyors 31 and 32 are provided on the processing table 3.

As shown in (1), (2) and (3) of FIG.
When the pallet A is moved from the processing table 3 to the setup table 4, the drive device 10 rotates the sprocket wheels 5 and 6 counterclockwise to
A part of the lever 8 is inserted into the cover 11 through the open door 12, and the hook pin 11a of the loader hook 21 is inserted.
Is engaged with the groove 22a of the pallet hook 22 and moved toward the setup table 4. In addition, the setup table 4
When moving the pallet A in the direction of the processing table 3 above, the operation opposite to the above operation may be performed.

Further, as shown in (1), (2) and (3) of FIG. 6, when the pallet B is moved from the working table 3 toward the setup table 4, the drive unit 10 causes the sprocket wheels 5 and 6 to move. By rotating the lever 8 in the clockwise direction, a part of the lever 8 is moved from the open door 12 to the cover 1
1 into the inside of the loader hook 21 and hook pin 1
1a is engaged with the groove 22a of the pallet hook 22 and moved toward the setup table 4. Further, when the pallet B is moved in the direction of the processing table 3 on the setup table 4, an operation opposite to the above operation may be performed.

When the loader hook 21 of the lever 8 engages with the pallet hook 22 in the above loading / unloading process, the hook pin 21a is moved by the amount L1 of entry of the loader hook 21, that is, the distance between the fulcrum pin 15 and the hook pin 21a.
Enters the inside of the machine tool 2, the loader hook 21
Amount L1 required for engagement between the pallet hook 22 and the pallet hook 22
Can be secured sufficiently. Moreover, since the lever 8 does not become orthogonal to the linear chain 7 in the process of moving the lever 8 forward or backward and forms the inclination angle α, the path width L2 is small. As a result, the pallet loading / unloading device 1 can be installed in a narrow space position in the central portion of the setup table 4.

The sprocket wheels 5 and 6 and the chain 7 may be composed of a timing belt, a V-belt, a pulley or the like having sufficient strength. Therefore, they are replaceable equivalent elements.

[0014]

According to the present invention, when the lever reciprocates, the lever is inclined with respect to the chain.
The route width can be set small, and when the loader hook engages with the pallet hook inside the machine tool from the outside of the machine tool, the loader hook faces the shortest distance to the pallet hook, so that a sufficient amount of entry can be achieved. Even if there is a cover or other obstacle between the machining table and the setup table of the machine tool, the engagement of the loader hook and the pallet hook or the release of the loader hook can be performed at a distance larger than that of the conventional one. It will be possible.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a pallet loading / unloading device of the present invention.

FIG. 2 is an enlarged plan view of the engagement state of the loader hook with the pallet hook.

FIG. 3 is an enlarged plan view of the engagement state of the loader hook with the pallet hook.

FIG. 4 is an enlarged sectional view of a guide portion of a loader hook.

FIG. 5 is an explanatory diagram when the pallet A is moved from the machining table on the machine tool side to the setup table.

FIG. 6 is an explanatory diagram when the pallet B is moved from the machining table on the machine tool side to the setup table.

[Explanation of symbols]

 1 Pallet loading / unloading device 2 Machine tool 3 Processing table 4 Setup table 5 Sprocket wheel 6 Sprocket wheel 7 Chain 8 Lever 9 Frame 10 Drive device 15 Support point pin 16 pin 17 Guide 18 Guide rail 21 Loader hook 22 Pallet hook

Claims (1)

[Claims] 1. A pair of wheels are arranged in the loading / unloading direction between the inside of the machine tool and the setup position outside the machine, and an endless winding body is wound between both wheels and fixed to the winding body. The center of the lever is rotatably attached by a fulcrum pin, one end of the lever is movable along the linear guide between the wrapping bodies, and the loader hook is provided at the other end of the lever. A pallet loading / unloading device, wherein a loader hook is detachably engaged with a pallet hook of a pallet.