JPH0244882Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a warp straightening device for a strip-shaped product for correcting warpage (crossbow) in a direction perpendicular to the longitudinal direction of the strip-shaped product.

[Prior art]

For example, when stamping an IC lead frame using a strip-shaped material, warping called crossbow occurs in the width direction due to the influence of the internal stress of the material. This crossbow causes adverse effects such as lifting of the pad of the IC lead frame, floating of the leads, and variations in lead spacing.

Conventionally, this crossbow was corrected by tapping in a stamping die, but if the crossbow was large, sufficient correction could not be achieved.

[Purpose of invention]

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a warpage correction device for a band-shaped product that can reliably correct crossbows.

[Structure of the idea]

According to this invention, a pair of upper and lower rollers having a convex curved surface and a concave curved surface on the upper and lower sides, respectively, and a pair of upper and lower rollers having a concave curved surface and a convex curved surface on the upper and lower sides, respectively, are arranged in the feeding direction of the strip material. Adjustment means for adjusting the distance between the pair of upper and lower rollers are arranged in parallel, and the upwardly convex or downwardly convex crossbow of the product is corrected by one of the rollers.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of the device for straightening warpage of a belt-shaped product according to the present invention. This device has a pair of upper and lower rollers 1a, 1b and 2a, 2b arranged in parallel. Rollers 1a and 2b have convex curved surfaces as shown in FIG.
and 2a have a concave curved surface. Further, the rollers 1b and 2a having concave curved surfaces are each configured to be slidable in the vertical direction.

The roller 1b having the concave curved surface has a spring 3
A and 3b constantly apply a downward pressing force, and the position thereof can be adjusted by an adjusting screw 6 having a knob. Similarly,
The roller 2a having a concave curved surface has springs 4a, 4
An upward pushing force is constantly applied by b,
Its position can be adjusted by an adjustment screw having a knob 5. The strip material 7 is
It is set so as to pass between a pair of upper and lower rollers 1a and 1b and between a pair of upper and lower rollers 2a and 2b. First, stamping is performed with the rollers 1b and 2a having concave curved surfaces separated from the opposing rollers 1a and 2b having convex curved surfaces by adjusting screws 6 and knobs 5, respectively.
Check the crossbow of the product and adjust the position of each roller so that the product is warped in the opposite direction. Note that a guide roller 8 is provided at the entrance/exit of the strip material 7 of this device so that the strip material 7 passes between a pair of upper and lower rollers without going off course.

Now, some belt-shaped products have downwardly convex crossbows (see Figure 3a) and others have upwardly convex crossbows (see Figure 3b) due to the influence of internal stress caused by the processing process. reference). In the former case, both rollers 1b and 2a having concave curved surfaces are lowered. As a result, the crossbow is corrected by the pair of upper and lower rollers 2a and 2b. In the latter case, both rollers 1b and 2b having concave curved surfaces are raised upward. As a result, the pair of upper and lower rollers 1a, 1b
The crossbow is corrected by

Next, the adjustment mechanism for adjusting the interval between the upper and lower pair of rollers and the structure of the upper and lower pair of rollers will be described in more detail with reference to the AA cross-sectional view of FIG. 1 shown in FIG.

In FIG. 4, a roller 2 having a concave curved surface
The shaft 10 of a is fixed to a slide body 11, and this slide body 11 is movable only in the vertical direction with respect to the side plate 12. Springs 4a and 4b are disposed on the lower surface of the slide body 11 and act to push the slide body 11 upward. Further, the lower surface of an adjusting screw 6 having a knob 5 on the upper side is in contact with the upper surface of the slide body 11. On the other hand, the shaft 15 of the roller 2b having a convex curved surface is fixed to the side plate 12. Therefore, by turning the knob 5, the vertical position of the roller 2a, that is, the distance between the rollers 2a and 2b, can be arbitrarily adjusted.

Further, the roller 2a has a shaft 10 and an outer peripheral portion 13.
A rolling bearing 14 is provided between the outer peripheral portion 1 and
Similarly, the roller 2b is provided with a rolling bearing 17 between its shaft 15 and an outer peripheral part 16, and the outer peripheral part 16 is rotatable with respect to the shaft 15. ing.

In this embodiment, the roller having a concave curved surface is movable in the vertical direction to adjust the interval between the rollers, but the roller having a convex curved surface may be movable in the vertical direction. Further, the mechanism for adjusting the interval between the rollers is not limited to this embodiment. Further, the shape of the pair of upper and lower rollers is not limited to that shown in FIG. 4, but may be of any shape as long as it can correct crossbows.

[Effect of idea]

As explained above, according to the present invention, crossbows in a band-shaped product can be corrected accurately. In addition, when the thickness of the material changes, the size of the crossbow changes, and even when the direction of the crossbow is convex upward or convex downward, the selection of roller pairs and the This can be easily accommodated by adjusting the spacing between the rollers.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the device for straightening warpage of a strip product according to the present invention, FIG. 2 is a perspective view showing the roller of FIG. 1, and FIGS. 3 a and b show a strip material having crossbows, respectively. FIG. 4 is a sectional view taken along line AA in FIG. 1. 1a, 2b...Roller having a convex curved surface, 1
b, 2a...Roller having a concave curved surface, 3a,
3b, 4a, 4b...Spring, 5...Knob, 6...
...adjustment screw, 7...band material, 8...guide roller.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of upper and lower first rollers having a convex curved surface and a concave curved surface on the upper and lower sides, respectively; and a pair of upper and lower rollers having a concave curved surface and a convex curved surface on the upper and lower sides, respectively. A second pair of rollers are arranged in parallel along the feeding direction of the strip-shaped material, and depending on the state of warpage of the strip-shaped material, either the first roller pair or the second roller pair is selected. The selected roller pair is brought close to the strip material, and the roller pair is moved so as to increase the distance between the unselected roller pair and release the roller pair from the pressed state. 1. A warpage straightening device for a belt-shaped product, characterized by comprising an adjustment means for adjusting the position of the belt-shaped product. (2) Each of the roller pairs is configured such that at least one of the rollers is slidable in the vertical direction, and the adjusting means selects the pressing roller pair by sliding the roller in the vertical direction. 1. A device for straightening warpage of a band-shaped product as set forth in claim (1) of the utility model registration.