JP2013176792A - Die lifting-lowering mechanism and press brake provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die lifting-lowering mechanism capable of lifting and lowering a die at low cost with a reduced burden on a labor.SOLUTION: A die lifting-lowering mechanism (52) is used for a press brake (51) including a body (HT) along which a table (3) is lifted and lowered. The die lifting-lowering mechanism (52) has: a first rotary wheel (11), which is integrally provided in the side of a table (3); a second rotary wheel (12), which is integrally provided in the side of the body (HT); a looping transmission member (13), one end side of which is fixed to one side of the table (3) and one side of the body (HT), and which is looped over the first and second rotary wheels (11), (12); and a die holder (9), which is fixed to the other side of the looping transmission member (13) and can hold a die (4). The die lifting-lowering mechanism (52) is composed such that the die holder (9) is lifted and lowered as the table (3) moves up and down.

Description

  The present invention relates to a mold lifting mechanism and a press brake equipped with the same, and in particular, a mold lifting mechanism that lifts and lowers a mold between a position near the floor and a table position when replacing the mold of the press brake. And a press brake including the same.

  2. Description of the Related Art A mold raising / lowering mechanism that raises and lowers a die to be exchanged from a height near the floor to a height of a table of the press brake when exchanging the die of the press brake is known. Among them, there is one described in Patent Document 1 as an example of an apparatus suitable for a particularly small factory.

JP-A-8-174098

The device having the mold lifting mechanism described in Patent Document 1 is not a large and expensive device introduced into a large-scale factory or the like, but has been proposed as suitable for a small and inexpensive small-scale factory.
From this point of view, the device described in Patent Document 1 uses a foot-operated hydraulic pump that operates the cylinder as the driving source for the lifting operation and uses the power source as human power. Reduction is desired.
In order to reduce the burden on workers, it is also considered to install a power source such as a motor in the main body of the equipment, but adding a motor etc. increases the cost and complexity of the structure, so it is suitable for small-scale factories. As such, it is not preferable.

  Therefore, the problem to be solved by the present invention is to provide a mold raising / lowering mechanism capable of raising and lowering the mold at a low cost and with less burden on the operator, and a press brake including the same.

In order to solve the above problems, the present invention has the following configuration.
1) A mold lifting mechanism used for a press brake (51) in which a table (3) moves up and down relative to a main body (HT),
A first rotating wheel (11) integrally provided on the table (3) side;
A second rotating wheel (12) integrally provided on the main body (HT) side;
One end side is attached to one of the table (3) side and the main body (HT) side, and a winding transmission member (13) wound around the first and second rotating wheels (11), (12). When,
A mold holder (9) attached to the other side of the winding transmission member (13) and capable of holding the mold (4);
The mold lifting mechanism (52) is characterized in that the mold holder (9) moves up and down as the table (3) moves up and down.
2) The mold lifting / lowering according to 1), which is provided on the main body (HT) side and has a guide part (14) which engages with the mold holder (9) and guides its lifting / lowering. Mechanism (52).
3) The mold according to 1) or 2), wherein the winding transmission member (13) is a wire, and the first and second rotating wheels (11), (12) are pulleys. An elevating mechanism (52).
4) A press brake comprising a main body (HT) and a table (3) that moves up and down relative to the main body (HT),
A first rotating wheel (11) integrally provided on the table (3) side;
A second rotating wheel (12) integrally provided on the main body (HT) side;
One end side is attached to one of the table (3) side and the main body (HT) side, and a winding transmission member (13) wound around the first and second rotating wheels (11), (12). When,
A mold holder (9) attached to the other side of the winding transmission member (13) and capable of holding the mold (4);
The press brake (51) is characterized in that the mold holder (9) is moved up and down as the table (3) is moved up and down.
5) The press brake according to 4), further comprising a guide part (14) provided on the main body part (HT) side, which engages with the mold holder (9) and guides its elevation. 51).
6) The press brake according to 4) or 5), wherein the winding transmission member (13) is a wire, and the first and second rotating wheels (11), (12) are pulleys. (51).

  According to the present invention, it is possible to obtain the effect that the mold can be moved up and down at a low cost with a small burden on the operator.

In the Example of the press brake of this invention, it is an external appearance perspective view which shows the state which the upper table fell. In the Example of the press brake of this invention, it is an external appearance perspective view which shows the state which the upper table raised. It is a top view for demonstrating the structure about the Example of the metal mold | die raising / lowering mechanism of this invention. It is a schematic diagram for demonstrating operation | movement in the Example of the metal mold | die raising / lowering mechanism of this invention. It is a two-plane figure for demonstrating the principal part in the Example of the metal mold | die raising / lowering mechanism of this invention. It is a perspective view for demonstrating another principal part in the Example of the metal mold | die raising / lowering mechanism of this invention. It is a side view for demonstrating operation | movement in the Example of the die raising / lowering mechanism of this invention.

The preferred embodiments of the present invention will be described with reference to FIGS.
<Example>
As shown in FIG. 1, the press brake 51 of the embodiment has a main body portion HT and a punch holder 2 that detachably holds the punch 1 of the mold, and can be moved up and down (lifted) with respect to the main body portion HT. The upper table 3, the drive units 4a and 4b that move the upper table 3 up and down using hydraulic pressure or the like as a drive source, and the die holder 5 that detachably holds the die 4 of the mold. A fixed lower table 6 and an operation panel 7 attached to the main body HT via an arm are provided.
The main body portion HT has a left side plate 8a and a right side plate 8b that are substantially C-shaped in a side view.
A mold lifting mechanism 52 is provided on the right side of the main body HT.

  Due to the operation of the die lifting mechanism 52, when the die of the press brake 51 is exchanged, the next-use die (for example, die) conveyed by the operator from the die place (not shown) using the carriage DS is replaced. The upper surface 6a of the lower table 6 or the support surface of the die 4 in the die holder 5 can be lifted up. In addition, a mold (for example, a die) that has been used and should be replaced can be lowered onto the carriage DS from the height of the upper surface 6a of the lower table 6.

FIG. 1 shows a state in which a die to be used next is placed on the carriage DS while being accommodated in the die holder 9 and carried to a predetermined position beside the press brake 51.
Further, the press brake 51 is shown with the upper table 3 lowered.
FIG. 2 shows the press brake 51 in a state where the upper table 3 is raised from the state shown in FIG.
FIG. 3 is a schematic view when the mold lifting mechanism 52 is viewed from above.

The mold raising / lowering mechanism 52 is integrally attached to the right side portion of the upper table 3, and includes an upper pulley portion UP having an upper pulley 11 and a wire fixing portion 22 that are rotating wheels, and a right plate 8b of the main body portion HT. A lower pulley 12 which is a rotating wheel attached to a lower part, and hooks 13a and 13b are attached to both ends, and a wire 13 which is a winding transmission member wound around the lower pulley 12 and the upper pulley 11 at an intermediate part. And have.
The wire 13 has a hook portion 13 a attached to one end thereof detachably attached to a wire fixing portion 22 of a fixing portion KT integrated with the upper table 3, and an intermediate portion is directed downward from the wire fixing portion 22. After being wound around the guide groove provided on the outer peripheral portion of the lower pulley 12, it is moved upward, and further wound on the guide groove provided on the outer peripheral portion of the upper pulley 11, and then downward, and the hook at the other end The part 13b is detachably attached to the wire mounting part 9a of the die holder 9 (see also FIG. 5).

As is clear from FIG. 3, the lower pulley 12 is provided so as to be rotatable around an axis CL12 orthogonal to the right side plate 8b.
Further, the upper pulley 11 extends in a direction orthogonal to the right side plate 8b so that the wire 13 from the lower pulley 12 is stretched from the rear side to the front side and extends vertically toward the substantially central portion of the lower die holder 9. On the other hand, it is provided to be rotatable around an axis CL11 inclined by an angle θ.

FIG. 5A is a left side view of the die holder 9, and FIG. 5B is a front view.
FIG. 5A shows a state in which the die 4 is accommodated therein.
The die holder 9 is formed in a rectangular tube shape with both ends open, and a wire mounting portion 9a for mounting the hook portion 13b is provided on the upper surface.
The die 4 held by the die holder 9 has three types with different widths in cross-sectional shape. The die holder 9 has step portions 9b formed in a step shape so that all three types of dies 4 can be accommodated and held on both inner side surfaces facing each other. The die 4 is locked to one of the steps of the step portion 9b so as to be accommodated in the die holder 9.

Further, on one side of the die holder 9 (left side in FIG. 5), flanges 9c and 9c projecting in the left-right direction in FIG.
The flange 9c can be engaged with a holder guide 14 (see FIG. 1, which will be described later) provided on the right side surface 6b of the lower table 6. At the upper corner of the flange 9c, a tapered portion 9c1 is formed as a guide when engaging with the holder guide 14.

FIG. 6 is a perspective view for explaining the holder guide 14 provided on the right side surface 6 b of the lower table 6.
The holder guide 14 is provided such that a pair of guides 14a having a substantially L-shaped cross section extend in the vertical direction and face each other. The inner surface of the holder guide 14 and the right side surface 6b form a bag portion 14c that is a space in which the flange 9c of the die holder 9 can enter without play. That is, the parallel facing distance L14 between the pair of guides 14a is formed to be substantially the same as or slightly larger than the width L9 of the main body excluding the flange 9c of the die holder 9.

As shown in FIG. 7, the die holder 9 can be engaged with the holder guide 14 by inserting the flange 9 c into the bag portion 14 c from the lower side. Of course, it can be inserted and engaged from above.
In the engaged state, the die holder 9 can be smoothly moved in the vertical direction along the right side surface 6b while the end surface 9d is in contact with or in close proximity to the right side surface 6b of the lower table 6.

This vertical movement (up and down) is performed by the vertical movement of the wire 13 attached to the wire mounting portion 9a via the hook portion 13b.
When the wire 13 is lowered and the die holder 9 is moved downward, the wire holder 13 is placed on the cart DS that has been waiting (see FIG. 1).
When the wire 13 is lifted and moved upward with the die 4 accommodated in the die holder 9, the lower surface 4 s of the die 4 (see FIGS. 5 and 7) is the upper surface 6 a of the lower table 6 or the die 4 in the die holder 5. It is advisable to stop the elevation at the same height as the support surface that supports the.
Accordingly, by pushing the die 4 from the right side to the left side in FIG. 7 with the die holder 9 stopped, the upper surface 6a of the lower table 6 can be easily moved without moving the die 4 in the vertical direction. Alternatively, the die holder 5 can be moved to a support surface that supports the die 4.

Also at this stop position, the dimension is set so that the lower side of the flange 9c is engaged with the upper side of the guide 14a of the holder guide 14.
Specifically, the size and shape of the die holder 9 are set so that the lower end position H9 of the flange 9c is located below the lower surface 4s of the die 4 accommodated in the die holder 9 (see FIGS. 5 and 7). .

Next, the operation of the wire 13 that moves the die holder 9 up and down (up and down) will be described with reference to the schematic diagram of FIG. 4.
4A corresponds to the state of FIG. 1 and shows the position where the upper table 3 is lowered (lowered). FIG. 4B corresponds to the state of FIG. 2 and the upper table 3 is raised. The position is (up).

First, the vertical stroke (movement distance) of the upper table 3 between FIG. 4A and FIG.
When raising the die holder 9 from the state shown in FIG. 4A, the operator instructs the operation panel 7 to raise the upper table 3 by a predetermined distance st.
As a result, the distance between the upper pulley 11 and the wire fixing portion 22 (upper pulley portion UP) fixed integrally with the upper table 3 and the lower pulley 12 is increased by the distance st. The wire 13 in the portion between the wires 11 rises upward by a distance twice as long as the distance st.
Accordingly, with respect to the position of the lower surface 4s of the die 4, the distance H4 between the height position HD when placed on the carriage DS and the height position HB of the upper surface 6a of the lower table 6 is 2x (st). By setting the stroke distance st to, the die 4 is easily moved up and down between the position on the carriage DS and the position of the upper surface 6a of the lower table 6 without any force applied by the operator. be able to.

When the die holder 9 is lowered from the state shown in FIG. 4B, the upper table 3 may be lowered similarly by a predetermined distance st. As a result, the position of the lower surface 4s of the die 4 can be lowered by a distance of 2x (st) and placed on the carriage DS.
Also in this case, the operator does not need to give any force.

Thus, the press brake 51 provided with the mold lifting mechanism 52 of the embodiment uses the driving force for lifting the mold as the lifting / lowering operation of the upper table 3 that is originally provided in the press brake 51. Therefore, the burden on the operator is not substantially generated, and the mold can be moved up and down very easily and safely.
In addition, since the rotating wheel around which the winding transmission member is wound is provided on one side (upper table 3) and the other side (main body portion HT) that are relatively separated from each other, the die holder has a stroke larger than the distance to be separated and contacted. 9 can be raised and lowered.

  The embodiment of the present invention is not limited to the above-described configuration, and it goes without saying that the following modifications may be made without departing from the gist of the present invention.

The press brake is not limited to the upper table 3 that moves up and down, and may be a type of press brake in which the lower table 6 moves up and down.
The upper pulley 11, the lower pulley 12, and the wire fixing part 22 are preferably detachable from the right side plate 8b. Since it is attached at the time of die replacement work and is removed when the work is completed, if a set of these is prepared, it can be applied to the die work of a plurality of press brakes, and the equipment cost can be reduced.
The holder guide 14 may also be detachable.
The mold that is moved up and down by the mold lifting mechanism 52 is not limited to the die but may be a punch. In the case of a punch, a punch holder that can be accommodated according to the shape of the punch is used.
The mold lifting mechanism 52 may be attached to the left side of the press brake 51. Further, it may be attached to both the left and right sides of the press brake 51.
The wire 13 is provided with detachable hook portions 13a and 13b at both ends, so that it can be easily removed and attached, but is fixed to the wire fixing portion 22 so that it cannot be removed. May be.
The lift stroke (distance st) of the upper table 3 (or the lower table depending on the type of press brake) when using the mold lifting mechanism 52 is arbitrarily set. It may be programmed in advance.
The winding transmission member is not limited to the wire 13, and a cord-like, string-like, or strip-like member can be used. For example, a belt, string, chain, rope or the like may be used. When the winding transmission member is a chain, the upper pulley 11 and the lower pulley 12 that are rotating wheels may be sprockets.
The rotating wheels (for example, the upper pulley 11 and the lower pulley 12) are provided on one side (upper table 3) and the other side (main body portion HT) having relatively separated parts, as in the embodiment. It is not limited to one each provided. The wire fixing portion 22 may also be provided on the main body portion HT side.
The wire fixing portion 22 may be provided on either one side or the other side according to the number of rotating wheels 11 and 12 around which the transmission member 13 is wound between the one side and the other side.
By providing two or more rotating wheels on at least one side, the mold can be moved up and down with a larger stroke (distance H4) with respect to the above-described mold lifting mechanism 52 even if the distance st is the same.

DESCRIPTION OF SYMBOLS 1 Punch 2 Punch holder 3 Upper table 4 Die, 4a, 4b Drive part, 4s Lower surface 5 Die holder 6 Lower table, 6a Upper surface, 6b Right side 7 Operation panel 8a Left side plate, 8b Right side plate 9 Die holder, 9a Wire mounting part, 9b Step part 9c Flange, 9c1 Tapered part, 9d End face 11 Upper pulley (rotating wheel), 12 Lower pulley (rotating wheel)
13 wire (wound transmission member), 13a, 13b hook part 14 holder guide, 14a guide, 14c bag part 22 wire fixing part 51 press brake 52 mold lifting mechanism CL1, CL12 axis DS carriage H9 lower end position, HD, HB height Position HT Body L9, L14 Distance, st Distance UP Upper pulley

Claims (6)

A mold lifting mechanism used for a press brake in which a table moves up and down with respect to a main body,
A first rotating wheel integrally provided on the table side;
A second rotating wheel integrally provided on the main body side;
One end side is attached to one of the table side and the main body part side, and a winding transmission member wound around the first and second rotating wheels,
A mold holder attached to the other side of the winding transmission member and capable of holding a mold;
And a mold lifting mechanism characterized in that the mold holder moves up and down as the table is raised and lowered.   The mold raising / lowering mechanism according to claim 1, further comprising a guide part that is provided on the main body part side and engages with the mold holder to guide the raising / lowering thereof.   3. The mold lifting mechanism according to claim 1, wherein the winding transmission member is a wire, and the first and second rotating wheels are pulleys. A press brake comprising a main body part and a table that moves up and down relative to the main body part,
A first rotating wheel integrally provided on the table side;
A second rotating wheel integrally provided on the main body side;
One end side is attached to one of the table side and the main body part side, and a winding transmission member wound around the first and second rotating wheels,
A mold holder attached to the other side of the winding transmission member and capable of holding a mold;
And the die holder is configured to move up and down as the table is raised and lowered.   5. The press brake according to claim 4, further comprising a guide portion that is provided on the main body portion side and engages with the mold holder to guide its elevation.   The press brake according to claim 4 or 5, wherein the winding transmission member is a wire, and the first and second rotating wheels are pulleys.

Images