JPS62156290A - Mask device for spotting - Google Patents

Abstract

PURPOSE:To eliminate the various troubles to arise from the contact of a metallic sheet to be plated with mask rubber for a plating surface during the movement of the metallic sheet by providing a means for lifting the metallic sheet during ascending of an upper mask jig to said jig. CONSTITUTION:Rollers 8 of the lifting means 7 are held low near the lower part on the outer side at both ends of a frame 1 in the stage of lowering the jig 5 to bring the mask rubber 6 for the rear surface into press contact with the top surface of the metallic sheet 4 and executing spot plating under the condition under which the metallic sheet 4 is held stopped on the mask rubber 2. The rollers 8 of the means 7 ascending together with the jig 5 lift the metallic sheet 4 to thoroughly detach the metallic sheet from the mask rubber 2 even if said sheet is slack when the above-mentioned jig 5 is raised after the spot plating. The metallic sheet 4 is moved in this state to bring the part prior to plating of the metallic sheet 4 onto the mask rubber 2, then the metallic sheet is stopped and the operation similar to the above-mentioned operation is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mask device used in a spot plating method for lead frames and the like.

[Conventional technology]

In the spot plating method for lead frames, etc., a strip-shaped lead frame is placed with its back side up on a plated mask rubber that has multiple plating holes, and an upper mask jig that can be raised and lowered by an air cylinder is placed above. Place the back mask rubber on the lower surface of the upper mask jig, lower the upper mask jig, and perform spot plating by sandwiching the lead frame etc. between the plating surface mask rubber and the back mask rubber of the upper mask jig.

When the plating is completed, the upper mask jig is raised, the lead frame and the like are moved, and the part before plating is stopped on the mask rubber of the plating surface, after which spot plating is performed in the same manner as described above.

[Problem that the invention seeks to solve]

In the above plating method, when a band-shaped metal plate to be plated such as a lead frame moves, the plated surface contacts the plated surface mask rubber due to slack in the metal plate and slides, resulting in scratches on the plated surface. This causes problems such as the activated strike plating surface disappearing and the adhesion with the main plating being lost, or the strike surface itself disappearing and the base being exposed and the strike effect being lost.

[Means for solving problems]

In order to solve the above problems, the present invention provides the upper mask jig with a lifting means that lifts the metal plate to be plated when the upper mask jig is raised and separates the metal plate from the plating surface mask rubber.

[Effect]

Since the present invention has the above-mentioned configuration, under the condition that the metal plate to be plated is stopped, the upper mask jig is lowered, and the back mask rubber on the lower surface of the upper mask jig presses the metal plate onto the plated mask rubber.

When plating is completed and the upper mask jig is raised, the lifting means that has been raised together lifts the metal plate to be plated and separates it from the plating surface mask rubber, and as the metal plate to be plated moves, the metal plate to be plated Avoid contact with the plated mask rubber.

〔Example〕

In the embodiments shown in FIGS. 1 and 2, 1 is a frame;
2 is a plated mask rubber stretched over this frame 1, and plated holes 3 are provided at appropriate intervals. Further, although silicone rubber of 117 is used as the mask rubber 2 in the embodiment, it is not limited to this.

4 is a band-shaped plated metal plate with the plated side facing down.
In the case of the embodiment, it is a lead frame.

In this case, it is fed out from a reel (not shown) and taken up on a take-up reel, thereby moving intermittently at a constant pitch.

Reference numeral 5 denotes an upper mask jig, which is raised and lowered by an air cylinder or the like (not shown), and a back mask rubber 6 is stretched on the lower surface of this jig 5. This back mask rubber may be made of sponge rubber only, silicone rubber only, or a thin sponge comb layer placed under a thick sponge rubber layer, and a thin silicone rubber layer temporarily attached below that.

Lifting means 7 are provided on both sides of the upper mask jig 5. In the illustrated example, this lifting means is a thin metal round rod bent into an L shape, and a thin roller 8 is attached to the lower side of the rod so as to rotate lightly.
When the upper mask jig 5 is lowered, it is lowered to the outside of both ends of the frame 1.

In the above apparatus, under the condition that the metal plate 4 to be plated is stopped on the plating surface mask rubber 2, the upper mask jig 5 is lowered and the silicone rubber layer 8 is crimped onto the metal plate 4 to be plated with an appropriate pressure. In this state, spot plating is performed by a known method.

At this time, the rollers 8 of the lifting means are lowered toward the outer lower part of both ends of the frame 1.

After performing spot plating in this manner, when the upper mask jig 5 is raised, the rollers 8 of the lifting means 7 that have been raised together with the jig 5 lift the metal plate 4 to be plated.

Therefore, even if the metal plate 4 is loose, the plated surface mask rubber 2
Stay far enough away.

In this state, the metal plate 4 to be plated is moved, and the part of the metal plate before plating is moved onto the lower mask rubber 2 and stopped, and then the same operations as described above are repeated.

〔effect〕

In this invention, as described above, the upper mask jig is provided with lifting means for lifting the metal plate to be plated when the upper mask jig rises, and when the upper mask jig rises, the metal plate to be plated is lifted and the lower part is plated Since it is sufficiently separated from the surface mask rubber, it has the unique effect of eliminating various problems caused by the metal plate coming into contact with the plating surface mask rubber when moving the metal plate to be plated, unlike in conventional plating equipment.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of a spot plating apparatus embodying the present invention, and FIG. 2 is a longitudinal sectional front view of the same. 2... Plated surface mask rubber, 3... Plated hole, 4... Metal plate to be plated, 5...
・Top mask jig, 6... Back mask rubber, 7.
...Lifting means, 8...Rollers.

Claims (1)

[Claims] A metal plate to be plated, such as a lead frame, is placed with the back side facing up on a plating surface mask rubber having multiple plating holes, and when lowered, the metal plate to be plated is placed on the lower surface of the upper mask jig set on the metal plate to be plated. In a spot plating apparatus in which a back mask rubber is applied to cover the back surface of a metal plate, the upper mask jig is provided with a lifting means for lifting the metal plate to be plated and separating the plated metal plate from the plated mask rubber when the upper mask jig is raised. A spot plating mask device characterized by: