JPH0144268Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a blade gap adjustment device in a shear.

BACKGROUND TECHNOLOGY In general, in a shear, the gap between the upper and lower blades is adjusted according to the thickness and material of the metal plate to be cut. A pair of front and rear wedge members (cotters) are disposed on the rear side of the slide plate having an upper blade, and the abutment surfaces of both wedge members are sloped toward the right and rearward, for example, and the front wedge A device in which the member can be slid left and right by a drive mechanism is already known (see Japanese Patent Laid-Open No. 58-4308).

Conventionally, a table with a lower blade for shearing, a bed on which the table is placed, a clamp device for fixing and releasing the bed, a hydraulic drive device for moving the table relative to the bed, and a front and rear end for controlling the back and forth movement of the table. comprising a stopper and an interlocking mechanism that loosens the clamping device during operation of the drive device,
Each stopper is manufactured and adjusted to create an appropriate cutting edge clearance for each of the multiple divisions of the plate thickness range targeted by the shearing machine. An automatic adjustment device for the blade edge clearance of a shearing machine has been proposed, which is fitted onto each of the horizontal protruding rods, interposed in the gap between the protruding rod head and the outer surface of the hanging edge of the table, and working to widen the gap. There is (Jikiakiaki
(See Publication No. 56-2322).

Problems to be Solved by the Invention However, in the former conventional blade gap adjustment device, the pair of front and rear wedge members has contact surfaces that are inclined only in one direction with respect to the upper die, so that the workpiece is not easily machined by shearing. When cutting materials,
When a strong backward force is applied to the slide plate due to the repulsive force, the front wedge member always tries to escape only to the right, and a strong force is applied to the screw feeding part of the drive mechanism of the wedge member. It was necessary to increase the strength of the drive mechanism, and this became a serious problem as the shear became larger and the length of the upper blade became longer.

Furthermore, with the latter automatic blade edge clearance adjustment device of conventional shearing machines, the blade edge clearance can only be adjusted in two or multiple stages, and the protruding length of the stopper in one or multiple stages can be adjusted depending on the thickness of the workpiece to be cut. There was a problem in that it was troublesome to have to adjust each one in advance.

The purpose of this invention is to solve the above-mentioned problems of the conventional technology, to be able to apply a large shear for cutting long materials to be cut, and to have a drive mechanism with particularly high strength even in the case of a large shear. An object of the present invention is to provide a blade gap adjustment device for a shear that can extremely easily and steplessly adjust the blade gap with high precision without requiring a shear, and can greatly improve work efficiency. There is something to do.

Means for Solving the Problems In order to achieve the above object, this invention consists of a bed and a lower blade fixing base that is placed on the upper surface of the bed so as to be movable back and forth and has a lower blade on the rear edge. A space is provided in the middle, and within the space, at least one first feed screw piece that is connected to each other via a coupling mechanism and has a right-handed male threaded portion and at least one second feed screw piece that has a left-handed male threaded portion.
A feed screw consisting of a feed screw piece is arranged in the length direction of the bed, and the first and second feed screw pieces are arranged in opposite directions from the left and right sides of the bed, respectively, so as to extend forward toward the center. The first and second movable blocks for moving the lower blade fixing table, each having an inclined rear surface, are screwed together so that they can move in opposite directions to the left and right, and the lower edges of the first and second movable blocks are connected to the upper surface of the bed. First and second rear parts are placed on the upper surface of the bottom wall of the guide recess provided in the longitudinal direction of the block, and have an inclined front surface along the inclined rear surfaces of the first and second movable blocks on the lower surface of the lower blade fixing base. A clamping block is attached to protrude into the space, and a first rear clamping block is provided on the upper surface of the bed, facing the first and second rear clamping blocks.
and a front clamping block having a rear surface that abuts the front surface of the second movable block,
The first and second movable blocks are sandwiched from both front and rear sides by front and rear clamping blocks, and each front clamping block is provided with a spring accommodating portion that is open to the front. A spring receiving member is attached to the front protruding edge of the blade fixing base in a rearwardly protruding manner, and the spring receiving member corresponds to each front holding block and receives the springs housed in the accommodating portion thereof. The first and second movable blocks are moved oppositely to each other to the left and right so that the distance between the first and second rear clamping blocks and the front clamping block is reduced or enlarged by the two movable blocks. The gist of this invention is a blade gap adjustment device for a shear, in which a lower blade fixing base is moved forward or backward to adjust the blade gap between the lower blade and the upper blade.

Embodiment Next, an embodiment of this invention will be described based on the drawings.

In this specification, front, rear, right and left are based on FIG. 1, where "front" refers to the front side of the sheet of paper in FIG. shall be said.

In the drawing, 1 is the shear body, 2 is the bed,
3 is a lower blade fixing table placed on the upper surface of the bed 2 so as to be movable back and forth, and 4 is a large number of bolts and bolts on the rear edge of this table.
The lower blade is attached by a nut 7, and the upper blade 5 is attached to the front edge of the lower end of the slide 6, which is moved up and down by a connecting rod. Reference numeral 8 denotes a blade gap adjustment device according to this invention, which is arranged between the bed 2 and the lower blade fixing base 3. Reference numeral 9 denotes lower blade fixing base guides attached to both left and right ends of the bed 2.

In the blade gap adjusting device 8, reference numerals 10 and 11 refer to a front protrusion and a rear protrusion provided in the front and rear edges of the lower blade fixing base 3 in the length direction of the lower blade fixing base 3, respectively. At the edges, these are placed on the upper surface of the bed 2, thereby forming a space 12 between the bed 2 and the lower blade fixing base 3. Reference numeral 13 denotes four brackets which are provided in a hanging manner at a predetermined interval from each other in the center of the width of the lower blade fixing base 3, and these include first and second rear holding blocks 14a,
14b are each attached in a predetermined position by bolts 16. Note that the front surfaces 15a, 15 of the first and second rear holding blocks 14a, 14b
b has a slope as described later. 1
7 is a pair of reinforcing plates attached between each bracket 13 and the rear flange 11; 18 is a lower blade fixing base 3;
A large number of openings for inserting spanners and the like are provided near the rear edge at predetermined intervals, and these openings are for tightening bolts and nuts 7 for fixing the lower blade 4.

Reference numeral 20 denotes a feed screw disposed over the entire length in the space 12 between the bed 2 and the lower blade fixing base 3. 2 feed screw piece 20
a and 20b. The first and second feed screw pieces 20a, 20b are provided with mutually different right-handed and left-handed male screw portions 21a, 21b. Further, both left and right ends of the continuous feed screw 20 are received by bearings 23 and 24, respectively. 25a, 25b are rectangular cylindrical first and second screws screwed onto the male screw portions 21a, 21b of the first and second feed screw pieces 20a, 20b, respectively.
This is a movable block, and each end thereof is provided with right-handed and left-handed female threads 26a and 26b that engage with male threads 21a and 21b. Rear surface 27 of first and second movable blocks 25a, 25b
a, 27b are sloped, and these are connected to the first and second rear clamping blocks 14a, 14b.
are brought into contact with the front surfaces 15a, 15b of.

That is, in this example, the first and second from the left
For example, a right-handed male threaded portion 21a is provided on the first feed screw piece 20a, and a right-handed female threaded portion is provided on the right end portions of the first and second first movable blocks 25a. 26a are screwed together, and the third and fourth from the left
On the contrary, the feed screw piece 20b has a left-handed male screw portion 2.
1b is provided, and female threaded portions 26b, also left-handed threaded, provided at the left end portions of the third and fourth second movable blocks 25b are screwed to this. The front surfaces 15a of the first and second rear holding blocks 14a from the left and the rear surfaces 27a of the first movable blocks 25a are sloped so that they slope forward as they move toward the center from the left. th and 4th second rear clamping blocks 14
The front surface 15b of the second movable block 25b and the rear surface 27b of the second movable block 25b are sloped so that they slope forward from the right toward the center. In this way, the first and second rear holding blocks 14a, 14b and the first
The reason why the second movable blocks 25a, 25b, and the male threaded portions 21a, 21b and female threaded portions 26a, 26b of the feed screw 20 are opposite to each other on both left and right sides is due to the rotation of the feed screw 20, as described below. When the lower blade fixing base 3 moves as shown,
This is to cancel the tensile load applied to the feed screw 20 on both the left and right sides.

Reference numeral 28 denotes a blade gap scale display case that is fitted over the left end portion of the feed screw 20 and attached to the left lower blade fixing base guide 9, and the left end portion of the feed screw 20 is rotatably mounted on the left side wall 29 of this case. A bearing 23 is attached to receive the bearing. 30 is a mounting portion of a handle 31 provided at the left end of the feed screw 20;
32 is housed in the case 28 and is connected to the feed screw 20.
The display on the scale plate 35 can be read by the movement of the needle 34 as the feed screw 20 rotates, using a needle fixing nut screwed onto a male threaded portion 33 near the left end of the needle. 36 is the first part of the lower blade fixing base 3 on the upper surface of the bed 2 near the front edge.
and a total of four front clamping blocks arranged so as to face the second rear clamping blocks 14a, 14b, each of which is provided with a front spring housing section 37 that is open to the front, and each of which has a required number of reset springs 38. It is contained. and the first or second
The first or second movable blocks 25a, 25b are disposed closely and slidably between the rear clamping blocks 14a, 14b and the front clamping blocks 36, 36. Further, each front holding block 36 is always biased rearward by the resilient force of the bell spring 38.

Reference numeral 40 denotes a spring receiving member attached to the front flange 10 of the lower blade fixing base 3 so as to protrude rearward in correspondence with each front clamping block 36, and each spring receiving member 40 is inserted into a hole of the counter spring 38. The pin 41, the receiving part 42 that directly receives the pressing force of the flat spring 38, and the male threaded part screwed from the inside into a large diameter threaded hole 44 provided through the front flange 10 of the lower blade fixing base 3. 43. Reference numeral 45 denotes a small-diameter screw hole provided in the front flange 10 of the lower blade fixing base 3 in parallel with the large-diameter screw hole 44 and penetrating therethrough, into which a male threaded member 46 for spacing is screwed. , the tip of this male threaded member 46 is abutted against the front surface of the front clamping block. Reference numerals 47, 48, and 49 are shallow recesses provided on the upper surface of the bed 2 in the length direction thereof, and the lower edge of the front protrusion 11 of the lower blade fixing base 3 is placed on the front recess 47. , the first and second movable blocks 25a,
25b is placed, and the lower edge of the rear protrusion 11 of the lower blade fixing base 3 is placed on the rear recess 49, and the lower blade fixing base 3 is placed at a predetermined distance necessary for adjusting the blade gap. It is arranged so that it can move on the bed 2 only by the amount.

Next, a method of adjusting the blade gap l between the upper and lower blades 4 and 5 for the shear will be explained.

A total of four first and second feed screw pieces 20a and 20b of the feed screw 20 are integrally connected to each other via a coupling mechanism 22, and a handle 31 attached to a mounting portion 30 at the left end of the feed screw 20 When rotated, the male threaded portions 21 of the first and second feed screw pieces 20a, 20b of the feed screw 20
The first and second movable blocks 25a, 25b, which are screwed together with the movable blocks 25a, 21b, move to the left and right to mutually opposite sides, and both movable blocks 25a, 2
5b to the first and second rear clamping blocks 14.
By reducing or expanding the distance between a, 14b and the front holding blocks 36, 36, the lower blade fixing base 3 moves forward or backward a required distance together with the lower blade 4, and the blade gap l is adjusted. It is something that

That is, as described above, the first and second first feed screw pieces 20a from the left of the feed screw 20 are provided with, for example, right-handed male threaded portions 21a,
In addition, the first and second movable blocks 2
The female screw portions 26a of the right-hand screws 5a are screwed together, and the third and fourth second feed screw pieces 20b from the left are oppositely provided with male screw portions 21b of left-hand screws. and the female screw portion 26b of the fourth second movable block 25b, which is also a left-hand screw, are screwed together. Therefore, for example, when the handle 23 is turned counterclockwise to rotate the feed screw 20, the first and second
The first movable blocks 25a screwed together with the first feed screw pieces 20a move from left to right, thereby causing the sloped rear surface 27a of the first movable blocks 25a to rotate against the first feed screw piece 20a of the lower blade fixing base 3. 1 Front face 15 with the same slope of the rear clamping block 14a
Pushed by a. . On the other hand, the second movable blocks 25b screwed together with the third and fourth second feed screw pieces 20b from the left move conversely from right to left, thereby causing the reverse slope of the second movable block 25B. The rear surface 27b having a slope is pressed against the front surface 15b of the second rear holding block 14b, which also has an opposite slope, and as a result, both movable blocks 25a, 25b
the first and second rear clamping blocks 14a,
14b and the front holding blocks 36, 36, the lower blade fixing base 3 is moved back a predetermined distance integrally with the lower blade 4 and guided by the left and right guides 9, 9. The blade gap l can be adjusted to become narrower.

Conversely, in order to widen the blade gap l, the handle 31 attached to the left end of the feed screw 20 can be turned in the opposite direction to that in the above case.
As a result, the first and second movable blocks 25
a, 25b to the first and second rear clamping blocks 14a, 14b and the front clamping blocks 36, 36.
The space between the lower blade fixing base 3 is reduced and
is moved forward a predetermined distance together with the lower blade 4, thereby adjusting the blade gap l to become wider.

The amount of movement of the lower blade fixing base 3 is determined by the feed screw 20.
Nut 32 attached to the male threaded part 33 on the left end
The movement of the needle 34 causes the blade gap to be displayed on the blade gap scale display plate 35.

In addition, in any of the above cases, the blade gap l
After adjusting the front edge 1 of the lower blade fixing base 3,
0 is screwed into the screw hole 45, and the tip of this member is pressed against the block 36. When cutting with a shear, the lower blade fixing base 3 and the lower blade 4 are This is allowed for forward escape, but these retreats can be prevented.

In the above embodiment, the feed screw 20 has a total of four first and second feed screw pieces 20a, 2 connected to each other via the coupling mechanism 22.
0b, but the structure is not limited to this, and the feed screw 20 includes at least one first feed screw piece 20a and a coupling mechanism 22 thereto.
Any structure may be used as long as it is constituted by at least one second feed screw piece 20b connected via. Therefore, there are at least one first and second movable blocks 25a, 25b screwed together, and correspondingly at least one first and second rear holding block 14a, 14b attached to the lower blade fixing base 3. It's a good thing to have.

Effects of the invention As described above, the blade gap adjustment device for a shear according to this invention is located between the bed and the lower blade fixing base which is placed on the upper surface of the bed so as to be movable back and forth and has a lower blade on the rear edge. A space is provided in the space, and within the space, at least one of the threads is connected to each other via a coupling mechanism and has a right-handed male thread.
A feed screw consisting of two first feed screw pieces and at least one second feed screw piece having a left-handed male threaded portion is disposed in the longitudinal direction of the bed, and
The first and second movable blocks for moving the lower blade fixing table have rear surfaces sloped in opposite directions from the left and right sides of the bed toward the center, respectively, on the first and second feed screw pieces. The lower edges of the first and second movable blocks are placed on the upper surface of the bottom wall of a guide recess provided in the longitudinal direction on the upper surface of the bed, and the lower edges of the lower blade First and second rear holding blocks having sloped front surfaces along the sloped rear surfaces of the first and second movable blocks are attached to the lower surface of the fixed base so as to protrude into the space. A front clamping block is disposed that faces the first and second rear clamping blocks and has a rear surface that abuts the front surfaces of the first and second movable blocks. Each front clamping block is provided with a spring accommodating part that is open to the front, and the spring is housed in this housing part. A spring receiving member corresponding to the block and receiving a spring housed in its housing is attached in a rearwardly protruding manner, and the first and second movable blocks are moved toward each other to the left and right by rotation of the feed screw. The lower blade fixing base is moved forward or backward by being moved to the opposite side and the distance between the first and second rear clamping blocks and the front clamping block being reduced or expanded by both movable blocks. The first feed screw piece and the second feed screw piece, which have a right-hand thread and a left-hand thread male thread part of the feed screw, are arranged so that the blade gap between the lower blade and the upper blade can be adjusted. Since the shear is connected to the shear via a coupling mechanism, it can be sufficiently applied even to a large shear that handles long materials to be cut.

In addition, the first and second movable blocks for moving the lower blade fixing table, which are screwed together with the first and second feed screw pieces, are held from both front and rear sides by the first and second rear holding blocks and the front holding block. A spring is held in the front holding block, and
A spring receiving member is mounted to correspond to each front clamping block, and by rotation of the feed screw, the first and second movable blocks adjust the distance between the first and second rear clamping blocks and the front clamping block. As the shear is reduced or expanded, the lower blade fixing base is moved forward or backward, and the gap between the lower blade and the upper blade is adjusted. The drive mechanism of the feed screw does not require any particular strength, and by turning the handle attached to the feed screw, the blade gap can be adjusted extremely easily and steplessly with great precision. This has the effect of significantly improving work efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention: Fig. 1 is a front view of the shear, Fig. 2 is a right side view of the shear, Fig. 3 is a partially cutaway enlarged plan view, and Fig. 4 is a diagram of the shear. FIG. 5 is an enlarged cross-sectional view taken along the line of FIG. 4. 1... Shear body, 2... Bed, 3... Lower blade fixing base, 4... Lower blade, 5... Upper blade, 8... Blade gap adjustment device, 9... Lower blade fixing guide, 10... Front flange, 11...Rear flange, 12...Space, 14
a, 14b...first and second rear holding blocks, 15a, 15b...sloped front surface, 20...
Feed screws, 20a, 20b...first and second feed screw pieces, 21a, 21b...male threaded portion, 22...
...Coupling mechanism, 25a, 25b...First and second movable blocks, 26a, 26b...Female screw portion, 27a, 27b...Slanted rear surface, 31...
...Handle, 36...Front clamping block, 38...
...Sara spring, 40...Spring receiving member.

Claims (1)

[Scope of utility model registration request] A space 12 is provided between the bed 2 and a lower blade fixing base 3 which is placed on the upper surface of the bed so as to be movable back and forth and is equipped with a lower blade 4 on the rear edge. A feed screw 20 that is connected via a coupling mechanism 22 and includes at least one first feed screw piece 20a having a right-handed male threaded portion 21a and at least one second feed screw piece 20b having a left-handed male threaded portion 21b. is bed 2
Rear surfaces 27a, 2 are arranged in the length direction and are inclined in opposite directions from the left and right sides of the bed 2 toward the center, respectively, on the first and second feed screw pieces 20a, 20b.
The first and second movable blocks 25a, 25b for moving the lower blade fixing base having the movable blades 7b are screwed together so that they can move in opposite directions to the left and right, and the lower edges of the first and second movable blocks 25a, 25b are , a guide recess 4 provided in the length direction on the upper surface of the bed 2.
The first and second movable blocks 25a, 25b are placed on the upper surface of the bottom wall of the lower blade fixing base 3.
The inclined front surface 1 along the inclined rear surfaces 27a and 27b of
The first and second rear holding blocks 14a, 14b having 5a, 15b are attached in a state of protruding into the space 12, and the first and second rear holding blocks 14a, 14b are attached to the upper surface of the bed 2.
4b and the first and second movable blocks 2
Front clamping blocks 36, 36 having rear surfaces abutted against the front surfaces of 5a, 25b are arranged,
The first and second movable blocks 25a, 25b are
Front and rear holding blocks 14a, 14b, 36, 36
Each front clamping block 36 is provided with a spring accommodating part 37 that is open to the front, and a spring 38 is housed in this accommodating part 37. A spring receiving member 40 that corresponds to each front holding block 36 and receives a spring 38 housed in its accommodation portion 37 is attached to the edge 10 in a rearwardly projecting manner. 1 and 2nd movable block 25
a, 25b are moved to the left and right to mutually opposite sides, and the first and second rear holding blocks 14a, 14 are moved by both movable blocks 25a, 25b.
By reducing or expanding the distance between b and the front holding blocks 36, 36, the lower blade fixing base 3 is moved forward or backward, and the lower blade 4 is moved forward or backward.
A blade gap adjusting device for a shear, which is configured to adjust the blade gap l between the upper blade 5 and the upper blade 5.