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As shown in FIG. 3 , the edges of the upper and lower blades 9 and 10 have slant faces 9 c and 10 c , respectively, which connect primary faces 9 b and 10 b with secondary faces 9 a and 10 a , respectively. The primary face 9 b of the upper blade 9 and the secondary face 10 a of the lower blade 10 are directed frontward and the secondary face 9 a of the upper blade 9 and the primary face 10 b of the lower blade 10 are directed rearward. More specifically, the primary face 9 b of the upper blade 9 and the primary face 10 b of the lower blade 10 are substantially aligned with each other along a plane 19 perpendicular to the sheet-shaped material 5 , and the secondary faces 9 a and 10 a of the upper and lower blades 9 and 10 are directed in the opposite directions from each other. Contact of the upper blade 9 with the superfluous amount of resin 2 a adhering, as shown in FIGS. 7 and 8 , on the sheet-shaped material 5 as the semi-finished product causes an excessively large stress to occur on the sheet-shaped material 5 . Arrangement in which the primary face 9 b and the secondary face 9 a of the upper blade 9 are directed to the opposite directions to those of the primary face 10 b and the secondary face 10 a of the lower blade 10 so that the primary face 9 b of the upper blade 9 and the primary face 10 b of the lower blade 10 are substantially aligned with each other along the above-mentioned plane 19 in accordance with the embodiment of the present invention, making it possible to reduce the stress applied on the sheet-shaped material 5 . It is therefore possible to prevent cracks from occurring on the product 5 b side of the sheet-shaped material 5 .
There is made a specific arrangement in which the blade edges of the upper blade 9 and the lower blade 10 do not come into contact with each other in the vertical direction so as to provide an appropriate gap between these blade edges even when the upper blade 9 moves to the closest position to the lower blade 10 , as shown in FIGS. 5 (B) and 6 (B). Such a specific arrangement makes it possible to form notches on the opposite surfaces of the sheet-shaped material 5 by means of the upper and lower blades 9 and 10 during the first half of the single cutting process and then break the portion of the sheet-shaped material 5 , which corresponds to the above-mentioned appropriate gap between the blade edges, during the second half thereof. It is therefore possible to accurately cut the sheet-shaped material 5 without causing cracks even when the sheet-shaped material 5 includes the substrate sheet 3 formed of hard material. |
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