JP2556949Y2 - Pallet changer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet changing device for moving a pallet on a pallet table to a table of a machine tool, and more particularly to a chain pallet loader for moving a pallet forward or backward by a chain pallet loader. The structure of the guide portion for guiding the vehicle.

[0002]

2. Description of the Related Art As a driving method of a pallet changing apparatus, there is a chain type pallet loader. In the chain type pallet loader, the chain bends in the winding direction, so that it can be incorporated in a narrow installation space or the like as compared with the cylinder type pallet loader. In such a chain-type pallet loader, when the chain is driven by a chain wheel and moved forward or backward, for example, in the horizontal direction, if a pressing force is applied to the chain, the chain is displaced from the linear direction and bends. A chain guide to prevent this is essential. In the related art, a chain guide for guiding the chain is provided so as to extend continuously from the pallet table at the pallet table loading position to the table position of the machine tool. In this case, the chain guide provided in the pallet changing device
Since it extends beyond the position where the splash guard of the machine tool that moves up and down is installed, the shape of the splash guard is complicated so that chips do not enter the chain guide to avoid interference between the splash guard and the chain guide. However, there is still a problem that chips may enter the guide.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art by providing a chain guide portion in a chain type pallet loader so as to be extendable and retractable.

[0004]

According to the present invention, there is provided a chain pallet loader provided on a side opposite to a machine tool with respect to a pallet table. In the process of moving, a chain guide for guiding the chain of the pallet loader is provided between the pallet table and the machine tool so as to be expandable and contractible in the direction of delivery to the machine tool. When the pallet loader advances, the pallet loader engages with the pallet loader to move the chain guide toward the table of the machine tool against the force of the urging means.

As described above, the chain guide moves forward or backward in conjunction with the forward / backward movement of the pallet loader.
The machine tool and the pallet changer are spatially completely separated from each other, so that chips and cutting fluid are not directly applied to the rotating and moving parts of the pallet changer, and can be completely separated by a splash guard etc. State.

[0006]

1 to 6 show the structure of a pallet changing device 1 according to the present invention. This pallet changing device 1
A pallet table 2 and a chain type pallet loader 3 are provided on the side of the machine tool 5.
The pallet table 2 is pulled by a conveyor chain 8, guided by rails 11 on a machine base 9 at a plurality of rollers 10, and moved in a direction perpendicular to the plane of the drawing, to form a chain-type pallet loader 3. Stop at the linked position.

The pallet 4 rests on a guide roller 12 of the pallet table 2 and, for example, a rear engaging piece 13
The lower groove portion is engaged with the regulation rail 14 provided in a discontinuous state on the machine base 9 so as not to move in the loading / unloading direction during the movement. At the carry-in / carry-out position with respect to 6, the regulating rail 14 is disconnected, so that it is movable in the carry-in / carry-out direction, and the upper groove portion engages with the downwardly protruding portion of the engaging body 15.

[0008] Then, a chain type pallet loader 3
Is assembled by a chain 16, a chain wheel 17, and the engaging body 15. Chain 16
Is wound around a chain wheel 17 and is reciprocated in a counterclockwise approach direction or a clockwise retreat direction by a drive source (not shown) connected to a drive shaft 18 of the chain wheel 17. I have. Also,
The engaging body 15 is fixed to the tip end of the chain 16, moves along the chain guide 19 on the machine base 9 at the rollers 26 on both sides, and on the upper side of the pallet table 2,
It is guided by a chain guide 27 and further guided by chain guides 71 and 72.

[0009] Here, the chain guides 71 and 72 are flat.
Provided in a state that on the surface facing to the original predetermined interval
You. One chain guide 71 is divided into two in the longitudinal direction.
The rear end portion is directly fixed on a bracket 23 attached to the machine base 9, and the front end portion is
Is attached to the movable frame 20. Also, the other switch <br/> Ainsworth guide 72 and the movable frame 20, more on the outside of the linear guide member 21, with respect to the bracket 23 is provided retractably in the loading and unloading direction of the pallet 4, the tip end The chain guide 71 and the chain guide 72 are connected by the connecting body 30 and the plate 31 so that the front side of the engaging body 15 is located at the contact body 22 on the front side in the carrying direction. In this way, the chain guides 71, 72
And the mechanism composed of the movable frame 20 as a whole
It is free to expand and contract in the loading / unloading direction of the let 4.

In this way, the guides 71, 72
Is provided between the pallet changing device 1 and the machine tool 5 and is supported on the machine base 9 by the bracket 23,
It is in communication with the chain guides 19 and 27. And a chain guide 71 and a chain guide 72 at the tip.
Is connected to one end of a wire 24 via a connector 30. The other end of the wire 24 is connected to an air cylinder type, a spring type or a gravity type urging means 25 using a weight via a pulley 29. It is connected and is always biased in the backward direction.

When the pallet changing device 1 receives the pallet 4, the engagement body 15 is kept at the retreat position by rotating the chain wheel 17 clockwise. Pallet table 2 with pallet 4 and rail 1
When the guide piece 1 reaches the position corresponding to the pallet loader 3, the engagement piece 13 engages with the engagement body 15. In this state, the pallet table 2 stops. Of course, at this position, since the regulating rail 14 is in a discontinuous state, the engaging piece 13 can move in a direction away from the regulating rail 14.

Thereafter, the chain 16 is rotated in the counterclockwise direction, thereby moving the chain 16 in the carrying-in direction and moving the engaging body 15 forward. At this time, the roller 26 and the chain 16 in the portion of the engaging body 15 are guided by the chain guides 19 and 27 and are accommodated in the grooves thereof, and do not buckle in the bending direction. For this reason, the chain 16 moves the pallet 4 in the direction of the table 6 of the machine tool 5 by rotating the chain wheel 17 in the counterclockwise direction.

In this manner, the chain 16 finally enters the guides 71 and 72. Then, when the front portion of the engaging body 15 hits the contact body 22, the movable chain guides 71 and 72 resist the urging force in the retreating direction by the urging means 25, that is, the chain type pallet loader 3, that is, the engaging body 15 And moves in the direction of the table 6 of the machine tool 5. Therefore, in the process of loading the pallet 4 from the pallet changing device 1 to a predetermined position on the table 6 of the machine tool 5, the chain 16
The first and second members 72 are constrained in a continuous state and do not bend. At this time, there is a discontinuous portion in the chain guide 71, but there is no practical inconvenience because the chain 16 is partially restrained by the chain guide 72 on one side.

When retracting the pallet 4, the chain wheel 17 is rotated clockwise. At this time, the chain 16 of the pallet loader 3 receives the pulling force and moves backward by being guided by the chain guides 71, 72, 27 and 19, and moves the pallet 4 to above the pallet table 2. In the process of retreating the engaging body 15, the chain guides 71 and 72 at the forward position move following the retreat of the engaging body 15 under the retreat of the engaging body 15 under the force of the urging means 25 together with the retreating of the engaging body 15, and return to the original position. Fits. In this manner, the pallet 4 is placed at a predetermined position on the pallet table 2 and is sent to the next step as the pallet table 2 moves.

[0015]

In the embodiment shown in FIGS. 7 and 8, the pair of auxiliary chain guides 73 and 74 are movable in the forward and backward directions by the movable frame 20 by the square groove 28, and the chain 16 is completely guided on both sides. It is an example. In this case, the pair of chain guides 71 and 72 are both fixed on the bracket 23.

[0016]

[Effects of the Invention] In the present invention, the movement path of the chain is regulated by moving the chain guide on the movable side, and the pallet changing device and the machine tool can be completely separated at the retracted position of the chain guide. The shape of the splash guard can be simplified and completely closed, and the machine can be completely closed by the splash guard. The function of the part and the movable part can be maintained for a long period of time, and the movable side guide follows the forward and backward movement of the chain type pallet loader, so that special driving means is not required, and Specific effects such as a simplified configuration can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a pallet changing device.

FIG. 2 is a sectional view of a part of a movable chain guide.

FIG. 3 is a plan view of a part of the chain guide in a retracted state.

FIG. 4 is a plan view of a part of a chain guide in an advanced state.

FIG. 5 is an enlarged sectional view of a guide portion of the chain guide.

FIG. 6 is a front view of a chain guide.

FIG. 7 is an enlarged sectional view of a part of a chain guide according to another embodiment.

FIG. 8 is an enlarged plan view of a part of a chain guide according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pallet exchange device 2 Pallet table 3 Chain type pallet loader 4 Pallet 5 Machine tool 6 Table 71, 72, 73, 74 Chain guide 15 Engagement body 16 Chain 25 Energizing means

Claims (1)

(57) [Scope of request for utility model registration] 1. A pallet (4) is made to work with a pallet table (2) by advancing and retracting a chain-type pallet loader (3) provided on the opposite side of the machine tool (5) with respect to the pallet table (2). Machine (5) table (6)
In the pallet changing device (1) moved between
A chain guide (71, 72, 73, 74) for guiding a chain (16) of a chain-type pallet loader (3) is provided between the pallet table (2) and the machine tool (5) to the machine tool (5). Provided in a state in which it can be extended and contracted in the delivery direction of
4) is urged in the reduction direction by the urging means (25), and is engaged with the chain-type pallet loader (3) when the chain-type pallet loader (3) advances, to the urging means (25). A pallet changer (1) characterized in that it is configured to advance in opposition.