JPS5814063Y2 - Table feeding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a table feeding mechanism, and more particularly to a table feeding mechanism suitable for application to industrial automatic machines.

In a conventional table feeding mechanism, its drive source is a motor or cylinder device separate from the drive section of the machine body, and is linked to the operation of the machine body via an electric signal.

However, such conventional table feeding mechanisms not only require a drive source separate from the drive unit of the machine body, but also are linked to the operation of the machine body via electrical signals, which can lead to malfunctions. The disadvantage is that it is dangerous and has a high possibility of failure.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and the object is to provide a table feeding mechanism that moves in reliable synchronization with the operation of the machine body.

The table feeding mechanism according to this invention includes a forward and backward latch lever that is connected to a reciprocating part of the machine body and moves up and down in response to the reciprocating movement of the reciprocating part, and a latch lever at the tip of the latch lever that is supported by a frame. A rotating indexing disk that rotates intermittently and is equipped with an indexing pin that can be engaged with the rotating indexing disk, a table that moves linearly intermittently back and forth by the intermittent left and right rotation of the rotating indexing disk, and a switching dog that is supported by a frame and operated by switching dogs at both ends of the table. and switching means for switching the state of engagement between the forward and backward latch levers and the rotary index disk.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the table feeding mechanism according to this invention.

The spot welding machine 1 is provided with a ram 2 that reciprocates up and down, and the ram 2 is equipped with an electrode rod 3.

That is, at the lowest end of the ram 2, the electrode rod 3 is adapted to spot weld a workpiece held on a table 30, which will be described later, together with an electrode installed below (not shown).

A bracket 10 is provided on the ram 2 as a reciprocating portion, and a forward latch lever 11 and a backward latch lever 12 are suspended from the bracket 10 via pin connections.

Forward latch lever 11 and backward latch lever 12
As shown in FIG.
1A and 12A are provided.

Further, the lower intermediate portions of the forward latch lever 11 and the rearward latch lever 12 are elongated guide holes provided in guide plates 13 attached to the column 2OA of the bearing section 20, which will be described later. It is guided through the section to prevent sideways movement.

The frame 4 of the spot welding machine 1 is the latch lever 1 for forward movement.
A bearing part 20 is fixed to the side of the hanging position of the latch lever 1 and the backward latch lever 12.

A feed shaft 21 is fixed to the bearing portion 20, and a pair of index disks 22 are fixed thereto.

One of the indexing discs 22 is provided with eight forward indexing pins 23 arranged in a small-diameter pitch circle.

Further, the other index disk 22 is provided with eight backward index pins 24 arranged in a large-diameter pitch circle.

The forward index pin 23 is engaged when the claw portion 11A of the forward latch lever 11 is raised, and rotates the index disk 22 clockwise in FIG. 2.

The retracting index pin 24 is engaged when the claw portion 12A of the retracting latch lever 12 is raised, and rotates the index disk 22 counterclockwise in FIG. 2.

A pinion 25 is fixed to the other end of the feed shaft 21 to which the index disk 22 is fixed.

Further, two parallel guide rods 5 are installed on the frame 4 and extend in a direction perpendicular to the axial direction of the feed shaft 21, and a table 30 is moved back and forth on the guide rods 5 through a force 41 part 31. Possibly supported.

Rack 3 is installed in the front and back direction on the upper surface side of the table 30 in the center of the table 30.
2 is attached, and the rack 32 is engaged with the pinion 25.

That is, the table 30 has a rack 32 and a pinion 25.
As the index disk 22 rotates intermittently in the clockwise and counterclockwise directions, it is intermittently fed and moved in the front-rear direction.

A forward end switching dog 33 and a backward end switching dog 34 are provided at both end edges of the table 30, respectively.

Further, a switching lever 40 is rotatably supported on the column 20A of the bearing section 20 via a support section 41.

As shown in FIGS. 3 and 4, the switching lever 40 comes into contact with switching dogs 33 and 34 at the forward and backward ends provided on the table 30, and moves the switching lever 40 around the support portion 41. Dog engaging part 40A to be rotated
and is extended in a bifurcated manner on the opposite side of dog 40A,
A first engaging portion 40B and a second retaining portion 40C are provided which push the forward and backward latch levers 11, 12 outward when the switching lever 40 rotates.

Further, a fixed locking portion 42 extending from the column 20A of the bearing portion 20 to an intermediate position between the first engaging portions 40B and 40C of the switching lever 40, and a dock engaging portion 4 of the switching lever 40 are provided.
A spring 44 is installed between the spring post 43 screwed to the 0A side, and the switching dog 33.34 at the forward end or backward end engages with the dog engaging portion 40A to enter the switching state. A rotational force in one direction about the support portion 41 is applied to the lever 40 to maintain the switching state to the forward or reverse side.

Next, - the operation of the above embodiment will be explained.

When the table 30 moves forward, the switching lever 40 is positioned as shown in FIG. The engagement between the portion 12A and the backward index pin 24 is released, and the claw portion 11A of the forward latch lever 11 and the forward index pin 23 can be held together.

In this state, the table 30 is lowered by the lowering of the ram 2.
The workpiece installed in the spora 1 is moved by the electrode rod 3.
After welding, when the ram 2 rises again, the claw portion 11A of the forward latch lever 11 engages with the forward index pin 23 to rotate the index disk 22 once clockwise in FIG.

As the index disk 22 rotates intermittently, the pinion 25
rotates while meshing with the rack 32, and moves the table 30 intermittently in the forward direction.

When the table 30 reaches the forward end after several intermittent movements in the forward direction, the forward end switching dog 33 engages with the dog retaining portion 40A of the switching lever 40, and the switching lever 40 is moved from the support portion 41 to the forward end switching dog 33. The second retaining portion 40C and the backward latch lever 12 are disengaged from each other, and the first engaging portion 40B is engaged with the forward latch lever 11. The claw portion 11A of the retracting latch lever 12 is pushed outward and the claw portion 12 of the retracting latch lever 12 is placed in a state where it can be engaged with the retracting index pin 24.

In this state, if the ram 2 reciprocates up and down, the claw portion 12A of the retraction latch lever 12 and the retraction index pin 2
4 engages intermittently, causing the index disk 22 to rotate intermittently in the counterclockwise direction in FIG.

According to the above embodiment, the table 30 is moved intermittently by utilizing the vertical movement of the ram 2 of the spot welding machine 1, and furthermore, the feeding direction of the table 30 can be switched back and forth by a simple switching mechanism.

In addition, since the feed movement of the table 30 is driven by the vertical movement of the ram 2, its movement is completely matched with the movement of the ram 2, and the table 30 is moved during spot welding by the electrode rod 3.
0 is not moved, there is no risk of malfunction, and the possibility of failure is extremely low.

In the above embodiment, the case where this invention is applied to the spot welding machine 1 has been described, but this invention can also be applied to other industrial automatic machines such as press machines.

Also, the index pin may be used for both forward and backward purposes, but if the feed pitch is different between forward and backward, the forward indexing pin and the backward indexing pin may be separated. It is necessary to do so.

As described above, the table feeding mechanism according to this invention includes a forward and backward latch lever that is connected to the reciprocating section of the machine body and moves up and down in response to the reciprocating motion of the reciprocating section, and a frame supported by the latch lever. a rotating indexing disc that is provided with an indexing pin that can be engaged with the claw at the end of the latch lever and rotates intermittently;
The table moves intermittently linearly back and forth due to the intermittent left and right rotation of the rotary indexing disk, and the latch levers for forward and backward movement are held in place by the switching dogs at both ends of the table supported by the frame and the rotary indexing disk. Since it has a switching means for switching, it has the effect that the operation can be reliably matched with the operation of the machine main body.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the table feeding mechanism according to this invention, Fig. 2 is a front view showing an enlarged view of the same main part, Fig. 3 is a side view of Fig. 2, and Fig. 4 is FIG. 3 is a plan view of FIG. 2;

Claims (1)

[Scope of utility model registration request] A forward and backward latch lever that is connected to the reciprocating part of the machine body and moves up and down in response to the reciprocating movement of the reciprocating part;
A rotating indexing disk that is supported by the frame and is equipped with an indexing pin that can be engaged with the claw at the end of the latch lever and rotates intermittently, a table that moves linearly back and forth intermittently by the intermittent left and right rotation of the rotating indexing disk, and the frame. A table feeding mechanism comprising switching means that is supported and operated by switching dogs at both ends of the table to switch the state of engagement between a forward and backward latch lever and a rotary indexing disk.