JPH08300215A - Shear - Google Patents

Abstract

PURPOSE: To surely provide a cut-off article having no rounded portions by providing a fixed lower blade having a pair of front and rear fixed cutting edges intersecting the front and rear side movable cutting edges for shearing. CONSTITUTION: When a handle lever 4 is brought down on this side, the upper side blade 7 moves in the direction of executing a shearing function. When the handle lever 4 is erected, the upper side blade 7 returns to the condition before the execution of the shearing function. The upper side movable blade 7 is vertically swingably supported through the upper side blade support member 11 and a second shaft on the proximal end portion of a frame part 2. A fixed lower bade 10 is unmovedly fixed to a bed seat part 1 through lower side blade support parts 13, 14. When both front and rear side movable cutting edges 5, 6 of the movable upper blade 7 are vertically swung, the cutting edges 5, 6 intersect the both front and rear side fixed cutting edges 8, 9 of the fixed lower blade 10 to shear. Thus, cut-off articles having no rounded portion (torsion, warp, or the like) and rounded chips are cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shear (shearing machine) for shearing a metal plate material or the like.

[0002]

2. Description of the Related Art A shear of this type known in the prior art has a fixed cutting blade in which a moving upper blade has a moving cutting blade only on one side, and a fixed lower blade crosses and moves with the moving cutting blade on the one side. It has a blade, and when shearing a metal plate material due to the crossing motion of these moving and fixed cutting blades, especially when shearing narrow products from thin materials, it is very troublesome to curl up There were problems such as.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new shear which is devised to solve the above problems.

[0004]

In order to achieve the above object, in a shear according to the present invention, a moving upper blade has moving cutting blades on both front and back sides, and a fixed lower blade has a moving cutting edge on each of these front and back sides. It has a pair of fixed cutting blades that cross each other with the moving cutting blade and shear with each other.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in the drawings, a cantilever overhanging frame portion 2 is provided on a pedestal portion 1, and a hand lever 4 is supported by a tip end of the frame portion 2 with a first shaft 3 so that the hand lever 4 can be raised and lowered. Below the frame part 2, there is a moving upper blade 7 having circular motion cutting blades 5 and 6 on both front and back sides, and on the pedestal part 1 there is a fixed lower cutting edge 8 and 9 having fixed cutting blades 8 and 9. The blades 10 are arranged vertically, and the moving upper blade 7 is the upper blade supporting member 1
It is swingably supported in the vertical direction on the base end portion of the frame portion 2 via the first and second shafts 12, and the fixed lower blade 10 is immovable on the pedestal portion 1 via the lower blade support portions 13 and 14. When the cutting blades 5 and 6 of the upper blade 7 are fixed, the upper and lower moving cutting blades 5 and 6 swing up and down. At the same time, the swinging end of the upper cutter supporting member 11 and the portion of the hand lever 4 near the base end are connected to the arc-shaped link 15 and the upper and lower pins 16 and 17.
When the hand lever 4 is brought to the front, the upper blade 7 moves in a direction in which the shear function is exerted, and when the hand lever 4 is in the standing state, the upper blade 7 is in a state before the shear function is exerted. And go back to link 15
The upper pin 16 is provided with a return spring 27 that automatically returns the hand lever 4 to the upright state when it is hands-free.

In the figure, 18 is a table, 19 is a sharpness adjusting screw, 20 is a mounting screw for the upper blade 7 for movement, 22 is a mounting screw for the fixed blade 10, and 23 is a mounting pin for the spring 27.

[0007]

As shown in FIG. 3, the sheared object 24 such as a metal plate material has the motion cutting blades 5 and 6 on both the front and back sides and the fixed cutting blades 8 on both the front and back sides when the upper moving blade 7 pushes down. , 9 is sheared by the shearing function due to the crossing motion with 9 and 9, and the narrow product 25 without curling (twisting, warping, etc.) and the chip 26 with curling are cut.

[0008]

When the shear according to the present invention is used,
It is possible to reliably obtain a cut product that is not curled.

[Brief description of drawings]

FIG. 1 is a partially cut side view showing an embodiment of a shear according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is also an operation explanatory diagram.

[Explanation of symbols]

 1 pedestal part 2 frame part 3 1st axis 4 hand lever 5 and 6 motion cutting blade 7 motion upper blade 8 and 9 fixed cutting blade 10 fixed lower blade 11 upper knife supporting member 12 second shaft 13 and 14 lower knife supporting member 15 link 16, 17 pin 18 table 19, 20 adjusting screw 21, 22 mounting screw 23 mounting pin 24 shearing object 25 narrow width product 26 chips 27 spring

Claims (1)

[Claims] 1. A pair of fixed cutting blades, wherein the upper moving blade has moving cutting blades on the front and back sides, and the fixed lower blade crosses and shears with the moving cutting blades on the front and back sides. Shah characterized by having.