JP2014097530A - Bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending device which has a reduced width of a whole machine by making distances between an optical safety device and surrounding members, and thereby has a reduced installation space.SOLUTION: A bending device comprising an optical safety device 1 constituted of a light emitter 2 and a light receiver 3 attached to an upper table 4, which is a ram, and to a lower table 5, has covers 12', 13' provided to a machine body and uses the covers 12', 13' to surround the light emitter 2 and the light receiver 3 respectively, making distances K1, K2, K3 from the light emitter 2 and the light receiver 3 to surrounding members thereof comparatively small by interposing the covers 12', 13'.

Description

  The present invention relates to a bending apparatus, and more particularly to a bending apparatus provided with an optical safety device including a projector and a light receiver attached to a ram.

  A conventional bending apparatus provided with an optical safety device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-275820 and Japanese Patent Publication No. 2008-520441.

  For example, as shown in FIG. 16, each includes an optical safety device including a light projector 52 and a light receiver 53 attached to an upper table 50 that is a ram.

  With this configuration, when the upper table 50 is lowered and the bending process is started in a state where, for example, the laser beam L is projected from the light projector 52 toward the light receiver 53, the operator's hand can control the punch P and the die D. By inserting the laser beam L between them, when the laser beam L is shielded, the upper table 50 that has been regarded as dangerous and has been lowered is brought to an emergency stop, thereby ensuring the safety of the operator.

JP 2003-275820 A Special table 2008-520441 gazette

  However, since the light projector 52 and the light receiver 53 move up and down together with the upper table 50, the light projector 52 and the light receiver 53 are sandwiched between, for example, the light projector 52 and the lower table 51 which is a peripheral member thereof (for example, an operator of this bending apparatus can It can be very dangerous).

  Therefore, in general, the distance K between the optical safety device (for example, the projector 52) and the peripheral member (for example, the lower table 51) is defined to require a certain value or more. It has been avoided.

  However, since the distance K between the optical safety device and its peripheral members needs to be a certain value or more, for example, as shown in the drawing, the projector 52 and the light receiver 53 are placed outside the upper table 50 (X-axis). Direction).

  As a result, the width in the lateral direction (X-axis direction) of the entire machine of the bending apparatus is increased, and eventually the installation space is increased.

  An object of the present invention is to provide a bending apparatus in which the horizontal width of the entire machine is reduced and the installation space is reduced by reducing the distance between the optical safety device and the peripheral member.

In order to solve the above problems, the present invention provides:
In the bending apparatus provided with the optical safety device 1 constituted by the light projector 2 and the light receiver 3 attached to the upper table 4 (FIG. 1) or the lower table 5 which is a ram as described in claim 1.
Covers 12 'and 13' are provided on the machine body, the projector 12 'and 13' are used to surround the projector 2 and the receiver 3, and the projector 12 'and 13' are interposed between the projector 2 and the projector 12 '. A technical means called a bending apparatus is provided in which the distances K1 (FIG. 6), K2, and K3 between the light receiver 3 and their peripheral members are set to be relatively small.

  According to the above configuration of the present invention, the projector 2 is attached to one side of the upper table 4 (FIG. 1), for example, a ram, and the light receiver 3 is attached to the other side. Closed L-shaped covers 12 and 13 that can be opened and closed are provided in the vicinity, and an L-shaped enclosure 24 that is oppositely disposed and rotatably disposed on the inside thereof (the hatched portion on the left side of FIG. 1A) , 25 (the hatched portion on the right side of FIG. 1A), and the covers 12 'and 13' are constituted by the L-shaped covers 12 and 13 and the L-shaped enclosures 24 and 25, and the projector. 2. Since the light receiver 3 is surrounded, the fingers of the operator's hand cannot access the projector 2 and the light receiver 3, and the danger of the worker is avoided. Therefore, by interposing the covers 12 'and 13' , An optical safety device 1 comprising a projector 2 and a light receiver 3 and its peripheral members, For example, as shown in FIG. 6, the distances K1, K2, and K3 between the lower table 5, the die D, and the punch P can be made relatively small, thereby making it possible to reduce the overall width of the bending machine. As a result, the installation space can be reduced.

  As described above, according to the present invention, by reducing the distance between the optical safety device and the peripheral member, the lateral width of the entire machine is reduced, and as a result, a bending apparatus having a reduced installation space is provided. There is.

It is a whole block diagram of the present invention (when covers 12 'and 13' are included). It is a whole block diagram of the present invention (when covers 12 'and 13' are not included). It is a partial block diagram of the present invention (when covers 12 'and 13' are included). It is a partial block diagram of the present invention (when covers 12 'and 13' are not included). It is a figure which shows the relationship between cover 12 'and the light projector 2 by this invention. It is effect explanatory drawing by this invention. It is a figure which shows the structure by the other Example of this invention. It is a figure which shows the evacuation operation | movement by the other Example of this invention. It is a figure which shows the reset operation | movement by the other Example of this invention. FIG. 6 is a detailed view according to another embodiment of the present invention. FIG. 6 is a detailed view according to another embodiment of the present invention. FIG. 6 is a detailed view according to another embodiment of the present invention. FIG. 6 is a detailed view according to another embodiment of the present invention. FIG. 6 is a detailed view according to another embodiment of the present invention. FIG. 6 is a detailed view according to another embodiment of the present invention. It is explanatory drawing of a prior art.

Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall configuration diagram of the present invention, and the illustrated bending apparatus is, for example, a press brake.

  FIG. 2 is also an overall configuration diagram of the present invention. The difference from FIG. 1 is that FIG. 1 is an explanatory diagram of the entire machine including covers 12 ′ and 13 ′, whereas FIG. , 13 'is an explanatory diagram of the entire machine.

The press brake (FIGS. 1 and 2) has side plates 8 and 9 on both sides of the machine body, and upper side plates 8 and 9 are provided with, for example, hydraulic cylinders 6 and 7 as ram driving sources, The upper table 4 which is a ram moves up and down by the hydraulic cylinders 6 and 7, and the punch P is attached to the upper table 4 (FIG. 6).
The ram drive source in this case is not only a hydraulic type in which the upper table 4 is moved up and down by the hydraulic cylinders 6 and 7, but the upper table 4 is moved up and down via a nut screwed into a ball screw rotated by a servo motor. There is also a servo type.

  In addition, a lower table 5 is disposed immediately below the upper table 4, and a die D is mounted on the lower table 5 (FIG. 6).

  That is, the bending apparatus shown in FIGS. 1 and 2 is a descending press brake, and an operator abuts a workpiece against an abutment (not shown) of a back gauge disposed behind the lower table 5 and positions the workpiece. Then, by turning on the foot pedal (not shown) to operate the hydraulic cylinders 6 and 7 described above and lower the upper table 4 as a ram, the workpiece is moved by the cooperation of the punch P and the die D. It can be bent.

  The upper part of the press brake is shielded from the outside by the upper shield 10 (FIG. 1) and the lower part by the lower shield 11, respectively, and the upper table 4 and the hydraulic cylinders 6 and 7 on both sides of the upper brake are disposed inside. 5 etc. are provided.

  A gap is formed between the upper shield 10 and the lower shield 11, and the lower end of the upper table 5 and the upper end of the lower table 5 described above are respectively exposed in the gap, and the upper table 4 (FIG. 6) is exposed. The punch P described above via the punch holder 30 is mounted on the lower end of the above), and the die D described above is mounted on the upper end of the lower table 5 via the die holder 31, respectively.

  Then, an operator inserts a workpiece from between the exposed punch P and die D, and lowers the upper table 4 as described above, whereby the workpiece is bent by the cooperation of the punch P and die D.

  As is clear from FIG. 2A, a control panel 20 is attached to the left side plate 8 as viewed from the front, and various control circuits are provided inside.

  On the other hand, the light projector 2 is attached to one end of the upper table 4 (FIGS. 1 and 2), which is a ram, by a bracket 14 and the light receiver 3 is attached to the other end by a bracket 15, respectively. A light beam L projected from 2 toward the light receiver 3, for example, a laser beam L, passes under the tip of the punch P (FIG. 6).

  In this state, when the upper table 4 is lowered and bending is started, if the operator's hand is inserted between the punch P and the die D and the laser beam L is shielded, the conventional technique is used. In the same manner, the upper table 4 that has been lowered due to danger is brought to an emergency stop, thereby ensuring the safety of the operator.

  Of the optical safety device 1 composed of the light projector 2 and the light receiver 3 having such functions, the light projector 2 and the light receiver 3 are surrounded by covers 12 'and 13' described later. As shown in FIG. 1, the relationship between the projector 2 and the cover 12 'and the light receiver 3 and the other cover 13' is the same.

  Therefore, in the following, either one, for example, the relationship between the projector 2 and the cover 12 'will be described in detail with reference to FIGS.

  As shown in FIG. 5, a side plate 8 is provided on one side of the upper table 4, that is, the inside of the left side, and a mounting plate 16 that extends outward is provided on the side plate 8. , Which protrudes forward (in the Y-axis direction) and includes a protrusion 16C including a front half protrusion 16C1 and a rear half protrusion 16C2, a left outer flat part 16A and a right inner flat part 16B orthogonal to the protrusion 16C. It is configured.

  5, the outer flat portion 16A and the projecting portion 16C constituting the mounting plate 16 and orthogonal to each other form an L-shaped enclosure 24, and the outer flat portion. A cover 12 having an L-shaped cross section, which will be described later, is coupled to the left end of 16A by a hinge (not shown) or the like so that it can be opened and closed with respect to the machine body.

  That is, the projector 2 may have a long life due to long-term use, or may break down during use, and therefore needs to be replaced with a new one. In this case, the cover 12 (FIG. 5) The old projector 2 is removed by opening and the cover 12 is closed after replacement with a new one.

  In other words, the fact that the cover 12 can be opened and closed allows maintenance of the projector 2, and this also applies to the light receiver 3 surrounded by the cover 13 (FIG. 1) (hereinafter referred to as “light receiving device 3”). As described above, the description of the projector 2 is applicable to the light receiver 3 in principle).

  The projecting portion 16C (FIG. 5) constituting the L-shaped enclosure 24 extends substantially from the rear (Y-axis direction) to the front of the machine body, and is closer to the front of the center of the projecting portion 16C (Y-axis). Direction), that is, at the boundary between the front half protrusion 16C1 and the rear half protrusion 16C2, a groove 23 is formed in the vertical direction (Z-axis direction). The bracket 14 to which is attached moves up and down together with the upper table 4.

  Further, the projection 16C is provided with a window 21 (FIG. 5) corresponding to the position of the projector 2 in the front-rear direction (Y-axis direction), and the laser light L emitted from the projector 2 is supplied to the projection 21C. It can pass through without being disturbed by 16C.

  As described above, the cover 12 has an L-shaped cross section, and is composed of a first member 12C and a second member 12A that are orthogonal to each other. A window 22 is provided across both the members 12C and 12A. The arranged projector 2 can be observed from the outside.

As shown in FIG. 5, the L-shaped enclosure 24 (shaded portion) and the L-shaped cover 12 are opposed to each other, and the cover 12 made of the opposed L-shaped members on both sides. ′ Surrounds the projector 2.
In this case, as described above ([0029]), the L-shaped enclosure 24 is formed by the outer flat portion 16A (FIG. 5) and the protruding portion 16C, and the front half of the protruding portion 16C. The protrusion 16C1 can rotate to the left as will be described later (line 3 to line 4 of [0046]).
Accordingly, in general, the cover 12 ′ surrounding the projector 2 is constituted by the L-shaped cover 12 which can be opened and closed, and the L-shaped enclosure 24 which is opposed to the cover 12 ′ and is rotatably arranged inside thereof. It can be said that it is configured.
In particular, the L-shaped enclosure 24 shown in FIG. 5 is formed by an outer flat portion 16A and a protruding portion 16C which are provided on the side plate 8 and constitute an attachment plate 16 extending outward and orthogonal to each other ([0029. ] 1 to 3 lines).
In other words, the L-shaped enclosure 24 shown in FIG. 5 is attached to the attachment plate 16 provided on the side plate 8 and extending outward (shaded portion).
In this respect, in another embodiment of the present invention to be described later (FIGS. 10 to 15), the enclosure 24 having the L-shaped cross section is significantly different from the case where it is attached to the cover 12 having the L-shaped cross section.

  Furthermore, an open / close detection means 18, for example, a limit switch, is provided at the left end of the lower table 5, and the open / close state of the cover 12 is detected.

  On the other hand, a transparent plate (for example, made of acrylic) is stretched between the window 21 formed in the L-shaped enclosure 24 (FIG. 5) and the window 22 formed in the L-shaped cover 12. Thus, the finger of the operator's hand is prevented from approaching the projector 2 inside, and the safety of the operator is ensured.

The operation of the present invention having the above configuration will be described below.
First, the covers 12 (FIG. 5) and 13 having openable and closable cross sections, which are installed on both sides of the machine body (FIG. 1) in advance, are opened, and the state of the projector 2 and the light receiver 3 is inspected.

  For example, when the projector 2 and the light receiver 3 are out of order, the covers 12 and 13 are closed after replacement with new ones (FIG. 5).

  Further, in this case, the bending order of the workpiece and the molds P (FIG. 6), D, and the mold layout to be used for each bending order are determined in advance, and the operator can set a predetermined mold according to the determined mold layout. The molds P and D are mounted on a predetermined processing station.

  In this state, the operator operates the optical safety device 1 including the projector 2 (FIG. 1) and the light receiver 3, and emits the laser light L from the projector 2 toward the light receiver 3. 6) and the die D, as described above, after hitting the back gauge abutment, by turning on the foot pedal, the hydraulic cylinders 6 and 7 are actuated to operate the upper table as a ram. 4 is lowered, and the workpiece is bent by the cooperation of the punch P and the die D.

  During this time, the projector 2 and the light receiver 3 in the covers 12 ′ (FIG. 1) and 13 ′ move up and down together with the upper table 4, and the light projector 2 and the light receiver 3 have an L-shaped cross section as described above. Since it is surrounded by the enclosures 24 (shaded portions on the left side of FIG. 1 (A)) and 25 (shaded portions on the right side of FIG. 1 (A)) and L-shaped covers 12 and 13, fingers of the operator's hand Cannot access the projector 2 and the light receiver 3.

  Therefore, the danger of the operator is avoided in this way, and therefore, by interposing the covers 12 and 13, the optical safety device 1 including the projector 2 and the light receiver 3 and its peripheral members, for example, as described above. The distances K1, K2, and K3 between the lower table 5 (FIG. 6), the die D or the punch P can be made relatively small, thereby making it possible to reduce the lateral width of the entire machine of the bending apparatus. Can reduce the installation space.

  FIG. 7 is a diagram illustrating a configuration according to another embodiment of the present invention, FIG. 8 is a diagram illustrating a retreat operation according to another embodiment of the present invention, and FIG. 9 is a diagram illustrating a return operation according to another embodiment of the present invention. 10 to 15 are detailed views according to other embodiments of the present invention.

  The embodiment (e.g., FIG. 5) of the present invention described above and the other embodiment of the present invention include a cover 12 having an L-shaped cross section in which the cover 12 '(FIG. 1) and 13' are openable and closable. 13 and the L-shaped enclosures 24 and 25 arranged opposite to each other and rotatably disposed inside thereof, as described above, in the former (for example, FIG. 5), The L-shaped enclosures 24 (shaded portions) and 25 are provided on the side plates 8 and 9 and attached to the mounting plates 16 and 17 extending outward, whereas the latter (for example, FIGS. 10 to 10). In 15), the L-shaped enclosures 24 and 25 are attached to the L-shaped covers 12 and 13 so that they are significantly different.

This is because, in another embodiment of the present invention, as described below, the overall machining efficiency is improved by shortening the time required for mounting the mold on the machine body.
Hereinafter, other embodiments of the present invention will be described with reference to FIGS. 7 to 9 and will be described in detail with reference to FIGS.

  That is, in a press brake, when a die, for example, a punch P is mounted on a machine body (for example, FIG. 6), the punch P is relatively long, and the punch P is attached to the punch holder 30. If it has to be inserted from the lateral direction (for example, in the X-axis direction of FIG. 6, from the left side to the right side), the above-described L-shaped cover 12 (FIGS. 5 and 6) described above is used. Get in the way.

  Therefore, for example, with respect to the L-shaped cover 12 (FIG. 5) on the left side, the cover 12 is rotated to the left side, and the projector 2 is also rotated to the left side. Similarly, if only the front half protrusion 16C1 of the body 24 is rotated to the left, the cover 12 and the like are retracted, so that there are no obstacles when the punch is mounted.

  In this case, when the punch P is mounted on the punch holder 30 (FIG. 6), the punch P is located immediately above the laser beam L emitted from the projector 2, so that the hatched portion (FIG. 5). The rear half protrusion 16C2 of the protrusion 16C that forms the L-shaped enclosure 24 is located behind the punch P (in the Y-axis direction). Therefore, the rear half protrusion 16C2 is not moved and is left as it is.

  However, as described above, the retracting operation of the cover 12 and the like when the mold is mounted is, for example, the cover 12, the projector 2, and the front half protruding portion with respect to the left-side L-shaped cover 12 (FIG. 5). Three operations of 16C1 rotation are required, and the operation is cumbersome and troublesome, and the time required for the operation becomes longer.

  This is exactly the same for the returning operation to return the cover 12 and the like to the original by rotating the cover 12 and the like rightward after the mounting of the mold is completed, and the cover 12, the projector 2, and the front half project. Three operations of reverse rotation of the part 16C1 are required, and the operation is troublesome and troublesome, and the time required for the operation becomes long.

  Therefore, the present invention is based on other embodiments shown in FIGS. 7 to 9 (FIGS. 10 to 15), and L-shaped enclosures 24 and 25 are attached to the L-shaped covers 12 and 13. As a result, the above-described retracting operation of the cover 12 and the like (and the returning operation is the same) can be performed by two operations, that is, the rotation of the cover 12 and the raising of the projector 2 (FIG. 8). This reduces the time required for operation.

  Therefore, as described above, according to another embodiment of the present invention, the overall machining efficiency can be improved by shortening the time for mounting the mold on the machine body.

  7 to 9, the relationship between the projector 2 and the cover 12 and the light receiver 3 and the other cover 13 (for example, FIG. 1) is the same. The relationship between the cover 12 and the cover 12 will be described in detail.

  As shown in FIG. 7, a side plate 8 is provided inside one side of the upper table 4, that is, the left side, and a vertical plate 40 extending outward is provided on the side plate 8. At the left end, the above-described cover 12 having a U-shaped cross section is connected by a hinge (not shown) or the like so that it can be opened and closed with respect to the entire machine.

  Further, in front of the vertical plate 40 (in the Y-axis direction), a projector 2 attached to the tip of the suspension member 41 is arranged so as to move up and down together with the upper table 4.

  And when this light projector 2 retracts with the cover 12 (for example, FIG. 8), it raises integrally with the suspending member 41, and is immersed in a machine main body.

  Furthermore, the L-shaped cover 12 (FIG. 7) is composed of a first member 12C and a second member 12A orthogonal to each other, and an L-shaped enclosure 24 is attached to the second member 12A. As will be described later (FIGS. 10 to 15), an opening / closing guide bracket 28 for guiding the L-shaped enclosure 24 when the cover 12 having an L-shaped section 12 is opened and closed is provided on the bottom surface 42 on the main body side. .

  When the L-shaped cover 12 having such a configuration is closed (FIG. 9) and the projector 2 is surrounded, the L-shaped enclosure 24 attached to the L-shaped cover 12 faces the projector 2. .

  That is, the surface of the projector 2 that emits the laser light L faces the L-shaped enclosure 24 in that case, and in that case, the L-shaped enclosure 24 is formed of a transparent plate (for example, acrylic resin). Therefore, the laser light L can pass through without being obstructed by the L-shaped enclosure 24 and the laser light L reaches the opposing light receiver 3 (FIG. 1).

Hereinafter, another embodiment of the present invention will be described in detail with reference to FIGS.
In FIG. 10, the L-shaped enclosure 24 is composed of a first member 24A and a second member 24B orthogonal to each other, and one end of a spring-equipped hinge 32 is attached to the first member 24A. The other end of the hinge 32 is attached to the inside of the L-shaped cover 12 via an attachment member 34.

  In this manner, the L-shaped enclosure 24 is attached to the L-shaped cover 12 via the spring-equipped hinge 32, and the force to open the spring-equipped hinge 32 to the outside. The L-shaped enclosure 24 is biased outward as indicated by an arrow A.

  The L-shaped enclosure 24 slides along and is guided along the opening / closing guide bracket 28 provided on the machine body side when the L-shaped cover 12 is opened and closed.

  For example, when the L-shaped cover 12 or the like is retracted (FIG. 11 ⇒ FIG. 12 ⇒ FIG. 13 ⇒ FIG. 14), the L-shaped enclosure 24 rotates the L-shaped cover 12 clockwise. The L-shaped enclosure 24 itself rotates clockwise about the spring-equipped hinge 32 (hereinafter referred to as rotation). In this case, as described above, the enclosure 24 having an L-shaped cross section is guided to the opening / closing guide bracket 28.

  Further, for example, when the L-shaped cover 12 or the like is restored (FIG. 14⇒FIG. 13⇒FIG. 12⇒FIG. 11), the L-shaped enclosure 24 has the L-shaped cover 12 as described above. On the other hand, while rotating in the same direction as the counterclockwise rotation (revolution), the L-shaped enclosure 24 itself is also pressed by the L-shaped cover 12 and centered on the spring-equipped hinge 32. Even in this case, the enclosure 24 having an L-shaped cross section is guided to the opening / closing guide bracket 28.

  However, as shown in FIG. 10, when the L-shaped cover 12 is completely closed, the projector 2 is surrounded by the L-shaped cover 12 and the L-shaped enclosure 24. The enclosure 24 having an L-shaped cross section comes into contact with the open / close guide bracket 28 and stops there as shown in the figure.

  On the contrary, as shown in FIG. 15, when the L-shaped cover 12 is completely opened, the projector 2 is surrounded by the L-shaped cover 12 and the L-shaped enclosure 24. At this time, the enclosure 24 having the L-shaped cross section is separated from the open / close guide bracket 28 as shown in the figure.

  For this reason, the enclosure 24 having the L-shaped cross section rotates in the clockwise direction based on the force to open to the outside of the spring-equipped hinge 32 and contacts the inside of the L-shaped cover 12 and stops there. To do.

  On the other hand, the opening / closing guide bracket 28 (FIG. 10) includes a portion 28A parallel to the longitudinal direction (X-axis direction) of the machine body and a bent portion 28B.

With this configuration, when the L-shaped cover 12 is rotated, for example, clockwise (FIG. 11), the L-shaped enclosure 24 is initially guided along the parallel portion 28A of the open / close guide bracket 28. However, thereafter, the watch is guided along the bent portion 28B sequentially (FIG. 12⇒FIG. 13⇒FIG. 14), whereby the timepiece centering on the spring-loaded hinge 32 of the L-shaped enclosure 24 is obtained. Direction rotation (spinning) is performed smoothly.

  The operation of another embodiment of the present invention having the above configuration will be described below.

(1) Initial state.
Initially, the L-shaped cover 12 (FIG. 10) is completely closed. At this time, as described above, the L-shaped enclosure 24 mounted rotatably inside the L-shaped cover 24 is opened and closed. (Hereinafter, the relationship between the L-shaped cover 12 and the projector 2 will be described in detail, but the relationship between the other L-shaped cover 13 and the light receiver 3 is the same). is there).

(2) Retraction operation.
In this state, when it becomes necessary to insert a relatively long die, for example, punch P (FIG. 8) from the lateral direction (X-axis direction) of the machine body, the L-shaped cover 12 is rotated to the left. At the same time, the projector 2 is raised and immersed in the machine body.

  In this case, the operation of the L-shaped cover 12 and the L-shaped enclosure 24 is as follows.

  That is, as described above, when the L-shaped cover 12 or the like is retracted (FIG. 11 ⇒ FIG. 12 ⇒ FIG. 13 ⇒ FIG. 14), the L-shaped enclosure 24 has the L-shaped cover. The L-shaped enclosure 24 itself rotates clockwise around the spring-equipped hinge 32 (rotation) while rotating in the same direction as 12 rotates clockwise (revolution). The L-shaped enclosure 24 is guided by the opening / closing guide bracket 28.

  When the L-shaped cover 12 is further rotated clockwise (FIG. 15) and fully opened, the projector 2 is surrounded by the L-shaped cover 12 and the L-shaped enclosure 24. At this time, the L-shaped enclosure 24 is separated from the open / close guide bracket 28 as shown.

  For this reason, the enclosure 24 having the L-shaped cross section rotates in the clockwise direction based on the force to open to the outside of the spring-equipped hinge 32 and contacts the inside of the L-shaped cover 12 and stops there. To do.

  In this way, the L-shaped cover 12 and the L-shaped enclosure 24 rotate clockwise, and the projector 2 (FIG. 8) is raised, so that a space is formed on the left side of the machine body. The obstructions are gone.

(3) Insert the mold.
With the cover 12, the enclosure 24, and the projector 2 retracted, a relatively long punch P is inserted into the punch holder 30 from the lateral direction as shown in FIG.

(4) Placement of the mold.
As described above, after inserting the punch P into the punch holder 30, the inserted punch P is moved in the punch holder 30 based on a preset die layout, and is arranged at a predetermined processing station. Thereby, the mounting operation of the mold ends. This is the same when the die is the die D (FIG. 6).

(5) Return operation.
After the mold mounting operation is completed, an operation opposite to the retreat operation of (2) is performed, the L-shaped cover 12 is rotated to the right, and the projector 2 is lowered to return to the original position. (FIG. 9).

  In this case, the operation of the L-shaped cover 12 and the L-shaped enclosure 24 is as follows.

  That is, as described above, when the L-shaped cover 12 or the like is restored (FIG. 14⇒FIG. 13⇒FIG. 12⇒FIG. 11), the L-shaped enclosure 24 has the L-shaped cover. As the 12 rotates counterclockwise as opposed to the above, it rotates in the same direction (revolution), and the L-shaped enclosure 24 itself is also pressed by the L-shaped cover 12 to become a spring-loaded hinge. While rotating in the counterclockwise direction around 32 (autorotation), the enclosure 24 having an L-shaped cross section is similarly guided to the open / close guide bracket 28 during this time.

  When the L-shaped cover 12 is further rotated counterclockwise (FIG. 10) and completely closed, the projector 2 is formed by the L-shaped cover 12 and the L-shaped enclosure 24. At this time, the enclosure 24 having an L-shaped cross section comes into contact with the open / close guide bracket 28 and stops there as shown in the figure.

  Thus, the projector 2 and the light receiver 3 are surrounded by the L-shaped cover 12 (FIG. 1), the L-shaped enclosure 24, the L-shaped cover 13 and the L-shaped enclosure 25. Then, by enabling the optical safety device 1, the laser light L is emitted from the projector 2 toward the light receiver 3, and in this state, bending is started as usual.

  In this case, as described above, the present invention is based on the other embodiment shown in FIGS. 7 to 9 and has been described above by attaching the L-shaped enclosure 24 to the L-shaped cover 12. With respect to the retracting operation of the cover 12 and the like (the same is true for the returning operation), two operations, that is, the rotation of the cover 12 and the raising of the projector 2 are sufficient (FIG. 8). The required time has been reduced.

  Therefore, similarly, as described above, according to another embodiment of the present invention, it is possible to improve the overall processing efficiency by shortening the mounting work time of the mold to the machine body. .

  Further, by attaching the L-shaped enclosures 24 and 25 to the L-shaped covers 12 and 13, the projector 2 and the light receiver 3 can be surrounded, so that the working examples shown in FIGS. The finger of the person's hand cannot approach the projector 2 and the light receiver 3.

  Accordingly, similarly to the embodiment of FIG. 5, the danger of the operator is avoided also by the embodiments of FIGS. 7 to 9, and therefore the projector 2 and the light receiver are provided by interposing the covers 12 ′ and 13 ′. The distances K1, K2, K3 between the optical safety device 1 consisting of 3 and its peripheral members, for example, the lower table 5 (FIG. 6), the die D or the punch P can be made relatively small, thereby The width of the entire machine of the bending apparatus can be reduced, and the installation space can be reduced eventually.

  The present invention can be used in a bending apparatus in which the horizontal width of the entire machine is reduced by reducing the distance between the optical safety device and the peripheral member, and thus the installation space is reduced. This is very useful when applied not only to press brakes but also to ascending press brakes in which the lower table moves up and down.

DESCRIPTION OF SYMBOLS 1 Optical safety device 2 Light projector 3 Light receiver 4 Upper table 5 Lower table 6, 7 Hydraulic cylinder 8, 9 Side plate 10 Upper shielding body 11 Lower shielding body 12 ', 13' Cover 12, 13 Cross-shaped L-shaped cover 14, 15 Brackets 16, 17 Mounting plates 18, 19 Open / close detection means 20 Control panel 21, 22 Window 23 Groove 24, 25 L-shaped enclosure 28, 29 Open / close guide bracket 30 Punch holder 31 Die holder 32, 33 Spring hinge 34 , 35 Mounting member 40 Vertical plate 41 Hanging member 42, 43 Bottom D Die P Punch

Claims (6)

In a bending apparatus equipped with an optical safety device composed of a projector and a light receiver attached to an upper table or a lower table which is a ram,
A cover is provided on the machine body, and the projector and the light receiver are respectively surrounded by using the cover, and the space between the light projector, the light receiver, and their peripheral members is set to be relatively small by interposing the cover. A bending apparatus characterized by that.   The bending apparatus according to claim 1, wherein the cover is configured by an L-shaped cover that can be freely opened and closed, and an L-shaped enclosure that is opposed to the cover and is rotatably disposed inside the cover.   The bending apparatus according to claim 2, wherein the enclosure having an L-shaped cross section is attached to a mounting plate provided on a side plate and extending outward.   The bending apparatus according to claim 2, wherein the L-shaped enclosure is attached to an L-shaped cover.   The L-shaped enclosure is attached to the L-shaped cover via a spring-loaded hinge and biased outward. The L-shaped enclosure is an L-shaped cover. 5. The bending apparatus according to claim 4, wherein the bending apparatus is guided along an opening / closing guide bracket provided on the machine main body side when opening and closing the machine.   When the L-shaped cover is completely closed, the L-shaped enclosure is stopped by abutting the open / close guide bracket, and when the L-shaped cover is fully opened, the L-shaped cover is stopped. 6. The bending apparatus according to claim 5, wherein the mold enclosure is moved away from the open / close guide bracket and comes into contact with the inside of the L-shaped cover to stop.

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