JPS6023981Y2 - descent device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lowering device mainly used in a dipping processing apparatus used when partial surface treatment such as partial plating is performed by dipping.

For example, partial plating of lead frames for semiconductors and contact pieces for reed switches is performed using immersion processing, and the workpiece is generally suspended and held in a holding jig. The workpiece is lowered into a processing tank filled with a processing liquid, so that only the required width of the lower end of the workpiece, that is, the immersion width, is submerged in the processing liquid.

However, when high accuracy is required in the dimensions of the processed surface, such as lead frames and switch contact pieces, immersion may occur due to bubbles, waves, and splashes that occur when the bottom edge of the workpiece submerges into the liquid surface. An important work condition is to avoid unnecessary disturbances to the surface.

By the way, the conventional method for lowering the holding jig in this type of machining is to lower the jig into the tank while hanging from a high place. It is unavoidable that the liquid surface will ripple due to the drop, or that splashes will be generated on the liquid surface due to the violent drop of the tip.For this reason, with conventional descending devices, it is difficult to maintain the immersion level precisely. was there.

The present invention solves the above-mentioned drawbacks by allowing the jig to be lowered quietly into the bath by mechanical operation.In other words, the purpose of the present invention is to prevent turbulence from immersion on the immersion surface. The object of the present invention is to provide a descending device mainly used in immersion processing which prevents this from occurring.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

In the jig lowering device of the embodiment, as shown in FIGS. 1 to 3, two pillars 2 are erected on both sides of the processing tank 1, and a frame 3 is installed between the tops of the pillars 2. Brackets 4 projecting from the corners of the processing tank 1 are provided at both ends of the frame 3.

Pin holes 3a are bored near each side end of the frame 3, and a large diameter head is inserted into the pedestal 5.
A holder 5 having a leg pin 5b protruding from the center of its bottom surface is held by the leg pin 5b in a recessed manner so as to be freely inserted and removed.

Further, a screw hole for an adjustment screw 6 made of a bolt is formed in the inner end of the bracket 4, and the adjustment screw 6 is screwed into this screw hole from below, and the head 6a of the adjustment screw 6 is inserted into the screw hole. An end of an abutment bar 7 as a stopper member with an adjustment screw 6 inserted therein is held between the flange 3 and the adjustment screw 6, which is fixed to the bracket 4 with a double nut 8. There is.

Next, the holder 9 formed into a stretcher shape by the two long L-shaped angle members 10 and the two short L-shaped angle members 11 is lifted from above the processing tank 1 by a suspension mechanism (not shown). Hook plates 1 made of L plates are movably held, and on both sides of each short angle member 11 of the holder 9.
1a is fixedly installed.

By the way, two workpiece holding jigs 12, only one of which is shown, can be hung side by side from the bottom surface of this holder 9. That is, the holding jigs 12 can be hung from the middle plate hole 13a.
A top plate 13 with an opening, and a side plate 14 with an ear part 14a.
The hook plate 11a is formed with a U-shaped cross section, and the hook plate 11a is connected to the hole 1.
By fitting the hooks 3a together, the hooks 3a are tightly held in the holder 9 so as to be able to move upwardly.

Although not shown, the hook plate 11a on one side is rotatable, so that the jig 12 can be attached and detached.

A large number of notches are formed in rows on the lower edge of each side plate 14, and each notch contains a workpiece W as a falling object.
is handed over and held in place.

Finally, a hydraulic cylinder 15 is erected on the ground in the middle of the column 2, and a two-pronged operating rod 17 is fixed in a T-shape at the upper end of its piston operating arm 16. , the contact plate 17a at the end of the operating rod 17 is connected to the leg pin 5b of each holder 5.
It is facing downwardly.

Next, the immersion lowering operation of the lowering device of the embodiment configured as described above will be explained with reference to FIGS. 4a to 4d.

When the workpiece W as a falling object is pulled up from the tank 1 (FIG. 4a), both the holder 9 and the jig 12 are floating in the air, and when the holder 9 descends, the fourth As shown in the figure, first, the end of the holder 9 is attached to the pedestal 5a of the holding body 5.
corresponds to

After this downward stroke, the suspension mechanism (not shown) of the holder 9 is in a following state with no output, that is, the piston actuating arm 16 is slowly lowered linearly based on the hydraulic control of the cylinder 15, and the contact plate is 17a is lowered, and the holder 9 is lowered accordingly.

Furthermore, during the above-mentioned descent, in the abutment stroke (FIG. 4C) in which the ear portion 14a of the jig 12 comes into contact with the abutment bar 7,
The immersion width of the lower end of the workpiece W becomes a predetermined immersion dimension, and the jig 12 is stopped at this position, but the piston operating arm 16 continues to move linearly downward by an appropriate amount, and as a result, as shown in FIG. 4d. Then, the frame 3 carries the load of the holder 9, and the foot plate 11a separates from the jig top plate 13.

Note that by operating and rotating the adjustment screw 6, the height of the bar 7 can be adjusted to easily correct the immersion dimension of the workpiece W, and the jig 12 can be reliably positioned horizontally.

To explain the lowering operation in more detail, the holder 5 moves from the point where the lower end of the workpiece W reaches the liquid level in numerical order to the frame 3.
The descending speed of the piston actuating arm 16 in the section up to the point where it contacts is made to be extremely slow.

Therefore, there are no bubbles, waves, splashes, etc. on the liquid surface.
This prevents the immersion dimension of the workpiece W from being disturbed.

As described above, according to the lowering device of the present invention, the jig for the object is lowered by the mechanical lowering of the hanger until the object is at a certain stage before reaching the predetermined lowering position. The structure is such that the jig is lowered by the slow operation of the holder by the piston from just before reaching the predetermined lowering position until the jig is securely positioned by the collision of the contact members. It has the effect of efficiently lowering the object to just before the lowering position, and then lowering it extremely quietly.It is particularly useful for lowering the workpiece into the processing tank during immersion processing, to prevent bubbling on the liquid surface. Ripples or splashes are prevented, and the immersion surface is not disturbed, and it can also be used to automate processing operations.

[Brief explanation of drawings]

FIG. 1 is a plan view of a descending device showing an embodiment of the present invention;
2 is a front view of the same, FIG. 3 is a side view of the same, and FIGS. 4a to 4d are enlarged operation views of the main parts of FIG. 2. W...Work as falling object, 5...
-Holding body, 5a...Pedestal, 7...Abutment bar as a contact member, 9...Holder, 11
a...Hook plate, 12...Holding jig,
15...Hydraulic cylinder, 16...Zeston operating arm.

Claims (1)

[Scope of utility model registration request] A holding jig configured to hold an object to be descended, a holder configured to allow the holding jig to be freely movable in an upward direction and suspended and supported, and the holding jig to be placed abutting each other in the middle of the descending path. The holding body is installed in such a way that it can be moved upwardly or downwardly from below in an abutting manner by the abutment member having the above-mentioned structure and the top of a piston actuating arm whose vertical speed can be separately adjusted. A lowering device comprising: a holder on which a holder is placed in contact with the holder.