JPS58217254A - Transfer device - Google Patents

Abstract

PURPOSE:To simplify a mechanism and control action, by simultaneously performing positioning action and clamping action of a work conveying pallet through the same driving source and using a clamping plate at a station position also as a guide rail. CONSTITUTION:The upper face of a clamping plate 14 is positioned in the same height as a guide rail 28 by a cylinder 5 at conveyance time, and a pallet 15 is moved on the guide rail 28 in a position between stations by a roller 21 while placed on the clamping plate 14 in a position of the station through reciprocating motion of a feed pawl 34 of a transfer bar 33. Then the pallet is lowered by the hydraulic cylinder 5, and a positioning bush 24 is fitted to a positioning pin 26 on the half way of lowering action of the pallet, then a clamped plate 18 is placed on a reference member 20, and the pallet 15 is positioned. Then a bottom face of the clamping plate 14 presses an upper face of the clamped plate 18 to obtain a clamping condition. In this way, as clamping and positioning of the pallet are combined by one action, construction and/or control can be simplified, and a processing cycle time can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pallet type transfer device,
In particular, it concerns pallet positioning and clamping means.

A pallet-type transfer device sequentially performs four basic operations: transfer, release of the feed claw, pallet positioning, and pallet clamp. In conventional transfer devices of this type, a dedicated drive source is generally provided for each of the above basic operations. For this reason, the drive mechanism is complicated and the control of the mechanical parts is complicated, making the device expensive and the time required for each operation increasing, resulting in a large amount of lost time for the machine.

Therefore, an object of the present invention is to simplify the mechanism and control of a pallet type transfer device, and
Another advantage is that the operating time can be shortened.

Based on the above object, the present invention simultaneously performs the positioning operation of a pallet for transporting workpieces and the clamping operation of the pallet using the same drive source, and also uses the clamp plate at the station position in common with the guide rail. It functions as a guide rail for pallet transport at the same time as positioning is released when unclamping.

Hereinafter, the present invention will be specifically explained based on the embodiments shown in FIGS. 1 to 4.

The transfer device 1 of the present invention has a machine frame 2 provided along a linear conveyance direction as a main structural part. A station base body 3 is fixed on this machine frame 2 at each station position by mounting screws 4. A hydraulically driven cylinder 5 is attached to the lower surface of the station base 3.

This cylinder 5 is a means for vertically moving a clamp plate 14, which will be described later, and faces downward, and the piston rod 7 of the piston 6 is fixed to the center of the connecting plate 8.

Four shafts 9 are fixed to the four corner positions of this connecting plate 8, and these shafts 9 fit vertically movably into the guide holes 10 of the station base 3, and their upper ends are connected to the guide holes 10 of the station base 3. It protrudes from the top. Note that there are 3 station bases, a part of which is connected to the hydraulic passage 11 for the cylinder 5.
．． 12 is formed.

The two shafts 9 arranged in the conveyance direction support a pair of clamp plates 14 by mounting screws 13 at their upper portions. These two clamp plates 14 are parallel along one conveyance direction 2, and in addition to the clamping action, the pallet 1 for conveying the workpiece
In order to also serve as a guide rail at the station position for 5, it is longer along the conveyance direction. A pair of clamps and a push plate 14 each fix a downward facing hinge 16 at the central position, and the balance pin 16 is connected to a stopper attached to the upper surface of the station base 3 at its lower end. It corresponds to 17. A pallet 15 is located above both clamp plates 14. This pallet 15 is provided with plates 18 to be clamped on both side edges in the conveyance direction.

The plate 18 to be clamped is long in the conveyance direction of the pallet 15, and is attached to the lower surface of the pallet 15 with screws 19 while being located below the clamp plate 14.

Furthermore, the station base 3 holds two reference members 20 at a position below the plate to be clamped 18 . These 20 reference members provide a reference height when the pallet 15 is clamped.

The pallet 15 has six rollers 21 in total, three on each side edge along the conveyance direction, at a position above the clamp plate 14.
It is equipped with These rollers 21 are rotatably supported by a horizontal support shaft 23 inside the roller housing groove 22 of the roller 15. Further, the pallet 15 is provided with two positioning bushes 24 for each plate 18 to be clamped. This bushing 24 passes through the clamped plate 18 from above and below, and is fixed to the lower surface of the pallet 15 at the four corners with mounting screws 25, and is fitted into a lower positioning pin 26. This positioning pin 26
are provided with four joints, each of which is fixed upwardly to the station base 3 at a position corresponding to the hole 27 of the bush 24.

On the other hand, two parallel guide rails 28 are provided between the stations.
are provided at regular intervals. These guide rails 28 are suspended over the station base 3 at the station position along the transport direction by means of fixing screws 29. The machine frame 2 also has a bearing 3o between the guide rails 28 and a rotating shaft 31 that is perpendicular to the transport direction and horizontal.
A guide roller 32 with a V groove is rotatably supported at the center position. This guide roller 32 supports a transfer bar 33 above. This transfer bar 33 is a means for reciprocating transfer in one direction, and is driven by a drive device that does not show the reciprocating motion in the transport direction, and uses its feed claws 34 to move the pallet 15 from one station to the next station. Feed intermittently. Note that this transfer bar 33 has the feed claw 34 in contact with the rear end surface of the pallet 15 when the pallet 15 is transferred, but when moving back, the transfer bar 33 rotates counterclockwise by a certain angle as shown by the imaginary line. Then, it passes under the subsequent pallet 15 to prepare for the transfer of the subsequent pallet 15.

Next, a series of operations will be explained. During transportation, the cylinder 5 pulls up the shaft 9 using the piston rod 7, so the upper surface of the clamp plate 14 is at the same height as the guide rail 28. In this state, the transfer bar 331
d. A reciprocating linear movement is performed with a stroke corresponding to the distance between the stations, and the pallet 15 is sent to the station position using the feed pawl 34. The pallet 15 has its rollers 21
Then, between stations, it moves above the guide rail 28, but at the station position, it moves from the guide rail 28 to the upper surface of the clamp plate 14 at the same height. When the pallet 15 is sent to the station position in this way, pressure oil is sent into the hydraulic passage 1.2, so
The cylinder 5 moves its piston rod 7 downwards, lowering all shafts 9 and clamping plates 14.

During this descent, the positioning bush 24 is inserted into its hole 27.
Since the positioning bins 2'f;'-M fit together and the plate to be clamped 18 rests on the upper surface of the reference member 20, the nozzle 15 is positioned at the reference height at the station position. Thereafter, the clamp plate 14 presses the upper surface of the clamped plate 18 downward with its lower surface, so that the pallet 15 is in a clamped state. Note that the balance bottle 16 is still in contact with the stopper 17 during clamping, receives the reaction force of the clamp plate 14, and prevents the clamp plate 14 from twisting. In this clamped state, pallet 15
Necessary processing is performed on the workpiece mounted on top of the workpiece.

When this process is completed, 1 x ttcm of oil is pumped into the hydraulic passage, so the cylinder 5 raises the clamp plate 14 to the same height as the guide rail 28 via the connecting plate 8 and shaft 9. During this rising process, the clamp plate 14 comes into contact with the roller 21 on its upper surface and receives the load of the knotlet 15.
Also, the hole 27 of the bushing 24 allows it to escape from the positioning pin.

The clamp plate 14 then stops at the same height as the guide rail 28 and is connected to the guide rail 28. Therefore, the transfer bar 33 pushes the let 15 with its feed claw 34 and feeds it to the next station. When this transfer is completed, the clamping operation is performed again at the next station, but in parallel with this. Then, the transfer bar 33 returns by passing under the pallet 15 with the feed claw 34 facing down, and then faces the rear surface of the following pallet 15 with the feed claw 34 raised again, and transfers the next feed. Wait for action.

In the above embodiment, the means for vertically moving the clamp platework 4 is the hydraulic cylinder 5, but this vertically moving means may be replaced by another drive device. Further, the clamp plate 14 is provided at the center 1) of the pallet 15, and the clamp plate 14 and the shaft 9 are
It may be located outside of 5. Furthermore, the conveyance means for the pallet 15, that is, the reciprocating means for one-way transfer,
The transfer bar is not limited to one type.

According to the present invention, since pallet clamping and positioning are combined into one operation, the structure and control are simple, the cost is low and the reliability is high, and the operation time required for clamping and positioning is shorter than that of the conventional one. /2, thus shortening the takt time and increasing production at the same time.Furthermore, since the clamp plate also serves as a guide rail at the station position, the structure of that part is simplified and the load-bearing capacity is improved. The lift-and-carry type is improved compared to the one-sided type.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of the transfer device of the present invention, FIG. 2 is a partially cutaway front view of the same device, FIG. 3 is a vertical sectional view of the same device at the position of the station base, and FIG. same,
FIG. 3 is a vertical cross-sectional view of the device at the position of the guide rail; 1... Transfer equipment [, 3', station base, 5... cylinder, 9... shaft, 14...
...Clamp plate, 15...Pallet, 18.
...Plate to be clamped, 20...Reference member, 21...
・Roller, 24... Bush, 26... Positioning pin, 27... Hole, 28... Guide rail,
33... Transfer bar, 34... Feed claw.

Claims (1)

[Claims] In a transfer device that transports pallets from station to station, a clamp plate located under the pallet of the station, a guide rail located between the stations,
means for moving the clamp plate up and down between the clamp position and a position on the same plane as the guide rail; a positioning bin that is fixedly provided at the station and fits into a hole in the pallet during clamping; and a means for moving the pallet to the next station when the clamp plate is raised. A transfer device having a reciprocating means for sending a transfer in one direction, and configured so that the clamp plate is clamped when the clamp plate is lowered, and the clamp plate also serves as a guide rail when the clamp plate is raised.