JPH067850A - Device for maintaining posture of member - Google Patents

Abstract

PURPOSE:To provide a device for maintaining a posture as a means for holding a member by which the member is always maintained for a specified posture even if a supporter for the member is turned or rotated. CONSTITUTION:In the turning operation of supporting arms 21, 22, a sprocket 24 and a sprocket 27 are rotated synchronously with the turning, and since this rotation is transmitted to a rotating cylinder 29d, two holding pins 29a are held vertically. Also, in the rotating operation of a sub-arm 76a, the rotating cylinder 29d is rotated synchronously with the rotation, and the two holding pins 29a are always held vertically. Consequently, die holders 7, 12 are always held in a specified state, for example a vertical state, and the upper and lower dies which are vertically suspended and held by the die holders are also held for a specified posture, for example a vertical posture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a posture maintaining device for keeping a member in a constant posture, for example, a vertical posture.

[0002]

2. Description of the Related Art Conventionally, as a press brake, it is known that a work is bent by vertically pressing an upper die and a lower die. A storage device that lowers and stores it, and it is transferred from the storage device to the setup position by the transfer device,
The editing device that edits the mold so that it can be processed at the setup position, the automatic mold changing device that automatically replaces the used mold, and the mold supplied by the automatic mold changing device. A mold holding device for holding a vertical posture and performing an actual bending process is used as a main component (for example, Japanese Patent Laid-Open No. 2-268922). The automatic mold exchanging device is provided with two support arms that are rotatable and parallel to each other, and sub-arms that are rotatably provided at the tips of the respective support arms, and the sub-arms have a rotation axis at the center in the longitudinal direction. Holding pins are formed at both ends thereof so as to hold the longitudinal ends of the mold. At the time of mold replacement, a used mold is held by one holding pin of the sub-arm and a replacement mold held by the other holding pin in a state of being sandwiched from both sides in the longitudinal direction. Furthermore, after releasing the fixing means of each mold to the press / brake body, the sub-arm rotates half a turn in the mold releasing direction, and the replacement mold is brought to the holding position of the mold holding device, that is, the processing position. The used dies are positioned and fixed at the setup positions of the die editing apparatus. The holding pin can rotate with the center of the tip of the sub arm as the axis of rotation,
Moreover, by being regulated by the tip of the support arm via a sprocket or chain, the sub-arm rotates relative to the tip of the support arm as the sub-arm rotates. Is always configured to maintain a constant angular position, for example, a vertical position. Since the mold is held in the vertical posture in this way, the mold can be quickly and easily transferred to the mold holding device or the mold editing device of the processing machine main body.

[0003]

However, in the above-mentioned automatic mold exchanging device, although the mold can maintain the vertical posture with respect to the rotation of the sub-arm, when the support arm is rotated, the mold is installed by the same angle as the rotation angle. Since it rotates with respect to the floor, a large non-interference area must be taken on the outer circumference of the arm swivel space in order to avoid interference with other mechanisms, which hinders downsizing of the device and efficient arrangement of various mechanisms. It was Therefore, an object of the present invention is to provide a posture maintaining device that can always maintain the member in a constant posture, for example, a vertical posture, even if a member supporting the member turns or rotates.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to rotate a support arm which is provided so as to be pivotally positionable around a predetermined pivot axis and a horizontal rotation axis which is orthogonal to the support arm. A pair of sub-arms that are provided so as to be positionable and are provided symmetrically with respect to the rotation axis in a part of the support arm, holding means for holding a member arranged at the tip of the sub-arm, and the support arm. The rotation synchronizing means for rotating the holding means with respect to the support arm by the same angle as the rotation angle in synchronization with the rotation, and the rotation angle of the sub-arm in synchronization with the rotation of the sub-arm. A constant posture maintaining device for a member holding means, comprising: a rotation synchronizing means for rotating the holding means.

[0005]

According to the constant posture maintaining device for the member holding means of the present invention constructed as described above, when the support arm pivots about a predetermined pivot axis, the pivot synchronizing means synchronizes with the pivot of the support arm. When the member holding means is rotated with respect to the support arm by the same angle as the turning angle and the sub arm is rotated about a horizontal rotation axis orthogonal to the support arm, the rotation synchronizing means synchronizes with the rotation of the sub arm. The member holding means is rotated with respect to the sub arm by the same angle as the rotation angle. Therefore, if the member is set to a constant posture in the initial state, that is, a vertical posture, the member holding means keeps the member constant with respect to the horizontal plane at the tip of the sub arm regardless of the rotation of the support arm or the rotation of the sub arm. Posture, for example, always hold vertically.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a perspective view of a press brake, FIG. 2 is a partial sectional view of a mold holding device, FIG. 3 is a plan view of an automatic mold changing device to which the present invention is applied, and FIG. 4 is a partially enlarged view of FIG. FIG. 5 is a side view of the automatic mold changing device. As shown in Figure 1,
The body 2 of the press brake 1 is divided into a lower body 3 and an upper body 5 provided above the lower body 3. The press brake 1 includes a lower mold holding device 6 provided on the lower machine body 3, an upper mold holding device 9 provided on the upper machine body 5,
Upper and lower mold holding devices 9 forming the front part of the press brake 1,
6 and the automatic mold changing device 15 arranged behind 6 and the machine body 2
A mold accommodating device 31 provided along one side of
The split mold selection station 51 is provided behind the mold storage device 31, and is arranged between the setup positions (P2 and P3 shown in FIG. 5) of the mold editing device and the mold storage device 31. A mold transfer device (not shown) is used as a main part.

In the following description, the floor surface on which the lower body 3 is installed is a horizontal plane, and the direction toward the floor surface and the direction away from the floor surface are the downward direction and the upward direction, and the directions orthogonal to the floor surface are the same. The vertical direction will be described. In addition, the entire operation of the press brake 1 and the upper and lower mold storage devices 33 and 35.
For details of the upper and lower chain transfer devices 36, 37, 56, the mold storage device 31 mainly composed of the split mold selection station 51, and the mold transfer device including the upper and lower mold transfer devices, It is disclosed in Japanese Patent Application Laid-Open No. 2-268922 and is not an essential part of the present invention, so its explanation is omitted. Figure 2
As shown in FIG. 3, holder clamp cylinders 6b are provided on the base 6a of the lower mold holding device 6 at predetermined intervals in the longitudinal direction (indicated by an arrow HI in FIG. 1), and the lower mold holder 7 is vertically arranged. It is provided detachably in the direction (indicated by the arrow BC in FIG. 2). The holder clamp cylinder 6b holds the lower mold holder 7 by the lower mold holding device 6 by protruding and retracting in one width direction (indicated by an arrow DE in FIG. 2). The lower mold holder 7 includes a main holder 7a formed over the entire length of the lower body 3 and a sub-holder 7 held on the main holder 7a by a clamp cylinder 7c.
and b. The sub-holders 7b are formed to have a predetermined length, and the lower mold 11 is mounted on each sub-holder 7b. On the other hand, in the upper machine body 5, a ram 5a vertically movably provided, an upper die holding device 9 provided at a lower end of the ram 5a, and a vertically attachable / detachable lower portion of the upper die holding device 9. The upper die holder 12 provided is arranged. The upper mold holder 12 includes a main holder 12a formed over substantially the entire length of the upper machine body 5 in the longitudinal direction, and a sub-holder 12c arranged below the main holder 12a and fitted into the holding groove 12b. This sub holder 1
An upper mold 13 is detachably attached to the lower side of 2c. The main holder 1 is attached to the main body 9 a of the upper mold holding device 9.
A holding groove 9b into which the convex portion of 2a fits is provided, and a clamper 9c is provided so as to be swingable (in the direction of arrow GF shown in the figure) by driving a drive cylinder 9d with a part of the main body 9a as a fulcrum. . The main holder 12a set in the holding groove 9b is firmly sandwiched and held by the main body 9a and the clamper 9c. Further, holder holders 12e or 7d (not shown) corresponding to holder holding pins are provided at both longitudinal ends of the lower mold holder 7 and the upper mold holder 12, respectively.

As shown in FIGS. 1 and 3, the automatic mold exchanging device 15 includes upper and lower die exchanging devices 16 and 17 for exchanging the upper die holder 12 and the lower die holder 7, and an upper and lower die exchanging device. A frame 19 for supporting the mold exchanging devices 16, 17 and bearings 19a, 19b (not shown) are provided.
Since the configurations of the upper and lower mold exchanging devices 16 and 17 are the same, the detailed configuration will be described as a representative of the upper die exchanging device 16 with reference to FIGS. 3 and 4.
As shown in the figure, the drive shaft 20 horizontally supported by the bearing 19a has a coaxial / hollow structure.
a first hollow shaft 20a directly supported by a and a second hollow shaft 20b rotatably inserted in the first hollow shaft 20a.
It consists of and. Support arms 21 and 22 orthogonal to the axial direction are attached to both ends of the first hollow shaft 20a in the axial direction, and are fixed around the axis of the first hollow shaft 20a in the vicinity of the swing fulcrum of the support arms 21 and 22. Sprockets 2
0d is the first hollow shaft 20 via the metal bush 111.
a support arm 2 rotatably fitted to a
The drive cylinders 23 pivotally attached to the rams 23a can pivot the pedestals 1 and 22 vertically with the first hollow shaft 20a as a fulcrum. Hollow / cylindrical bearings 21a and 22a are formed at the tips of the support arms 21 and 22. A rotary shaft 25 is fitted in the shaft holes of the bearings 21a and 22a, and a metal bush 21b is also provided on the outer circumference. , 22b
The sprocket 24 and the sprocket 27 are rotatably fitted to each other via the
It is integrated with 7 so that it can be linked. Since the chain 28 is hung on the sprocket 27 and the sprocket 20d, the sprocket 27 and the sprocket 24 rotate in synchronization with the rotation of the support arms 21 and 22 (that is, the rotation of the first hollow shaft 20a). The upper die 13 is configured to always maintain a constant angular position with respect to the horizontal plane by relatively rotating by the same angle as the angle. On the other hand, at both ends of the second hollow shaft 20b,
Pulleys 20c and 20e are fixed to each other.
The drive shaft 30a of the drive motor 30 is fitted in the shaft hole of one pulley 20c, and the pulley 20c
c, 20e and a pulley 25a fitted in the rotary shaft 25
A timing belt 29e is hung on and, so that the drive motor 30 can rotate the rotary shaft 25. Further, in the rotating shaft 25, the pulley 25a
The sleeve 26 is fixed to the end opposite to the sleeve 2
From 6, a pair of two sub-arms 26a extends straight in opposite directions, and rotates with the rotation of the rotary shaft 25. A cylindrical retainer 29 is provided at the tip of the sub-arm 26a.
Includes a retainer body 29f and a rotary cylinder 29d that is rotatably fitted inside the retainer body 29f. Two holding pins 29a are accommodated in parallel inside the rotary cylinder 29d, and the holding pins 29a can freely project / drive and retract / retract, and when projected, the holder holder 12e of the upper mold holder 12 is held. The tip shape of the holding pin 29a is shaped so as to be fitted into. The two holding pins 29a are
In the initial state, they are set horizontally. Further, in the rotary cylinder 29d, the sprocket 29b is fixed to the outer peripheral portion protruding from the retainer body 29f,
A chain 29c is stretched over the sprocket 29b and the aforementioned sprocket 24. Therefore,
When the sub-arm 26a is rotationally driven by the rotation of the rotary shaft 25, the rotary cylinder 29d also revolves around the rotary shaft 25 on the same orbit as the retainer body 29f (revolves), but the rotary cylinder 29d includes the sprocket 29b and the chain. 29c. Since the sprocket 27 regulates the sprocket 27, the rotary cylinder 29d rotates (rotates) relative to the retainer body 29f and always maintains a constant angular position with respect to the horizontal plane. . For example, assuming that the two holding pins 29a are fitted in the holder holder 12e in a state where they are vertically aligned, the two holding pins 29a always keep the vertical state. Therefore, the upper mold holder 12 supported by the holder holder 12e also maintains a fixed posture, for example, a vertical state, and the upper mold 13 held vertically by the upper mold holder 12 in a fixed posture, for example, a vertical posture. Keep Further, as described above, when the support arm 21.22 is swung,
In synchronization with the turning, the sprocket 27 and the sprocket 24 rotate so as to maintain the same rotational angle position with respect to the horizontal plane. Since this rotation is also transmitted to the rotary cylinder 29d,
The two holding pins 29a keep the vertical state. In short, even if the sub arm 26a rotates or the support arm 21.22 turns, the upper mold holder 12 maintains a constant state, for example, a vertical state, and the upper mold 13 maintains a constant posture, for example, a vertical posture.

Next, the operation of die exchange by the automatic die exchange device 15 will be described. Here, one sub-arm 26a is in an empty state, and the other sub-arm 26a is in a state in which an upper die holder holding an upper die for replacement is attached, and is used with this upper die. The mold 13 is to be replaced. For convenience of explanation, the former upper mold and the mold holder will be referred to as a new mold and a new holder without reference numerals, and the latter upper mold 13 and the upper mold holder 1 thereof will be referred to.
2 is referred to as an old mold 13 and an old holder 12. First,
The drive cylinder 23 of the upper mold exchanging device 16 is driven to project the ram 23a in the direction (direction of arrow A3 shown in FIG. 5) (in the case of the lower mold exchanging device 17, the arrow shown in FIG. 5). When the support arms 21 and 22 are retracted in the direction of A4), the support arms 21 and 22 are kept at a certain angle. Then, the drive motor 3
The rotary shaft 25 is driven to rotate by 0, and the sub arm 26
Turn a to a horizontal position. That is, the support arm 2
1, 22 and the sub-arm 26a are kept in a certain posture, and the retainer 29 at the tip of the sub-arm 26a extending forward (in the direction of the old holder) from the support arms 21 and 22 is the old holder 12. Localize near both ends in the longitudinal direction. At this time, in the retainer 29, the two holding pins 29a are kept vertically aligned, so that the holding pins 29a are
Is opposed to the fitting portion of the holder holder 12e. Then, the holding pin 29a is projected and fitted into the holder holder 12e. With this, the upper mold holder 12 is firmly held at both ends by the retainer 29 of the sub arm 26a. Then, the drive cylinder 9d of the upper mold holding device 9
Is operated and the holding of the old holder 12 by the clamper 9c is released, so that the old holder 12 is ready to be pulled out in the downward direction (the direction indicated by the arrow C in FIG. 2). Therefore, the support arm 2 is driven by the drive cylinder
1.22 is swung downward (indicated by arrow A6 in FIG. 5) to disengage the old holder 12 from the upper mold holding device 9 and position it at a predetermined inversion position. Next, the sub-arm 26a is rotated by a half turn to position the new holder below the upper mold holding device 9 and the old holder 12 near the mold editing position of the machine body 2. Then, the drive cylinder 23 is driven to return the support arm 21.22 to the state having a certain angle. By the way, in the turning operation of the support arm 21.22, the sprocket 24 and the sprocket 27 rotate in synchronism with the turning, and this rotation is also transmitted to the rotary cylinder 29d, so that the two holding pins 29a maintain the vertical state. . Further, even when the sub arm 26a rotates, the rotary cylinder 29d rotates in synchronization with the rotation of the sub arm 26a, and the two holding pins 29a always maintain the vertical state. Therefore, the old die 13 that is vertically suspended and held by the old holder 12 in the vertical state always maintains the vertical posture. The new mold also maintains a vertical position. Therefore, when the support arm 21.22 is returned to the state where it has a certain angle, the convex portion of the new holder fits into the holding groove 9b of the upper die supporting device 9. here,
The drive cylinder 9d is driven to rotate the clamper 9c in the direction shown by the arrow F in FIG. 2 to sandwich the new holder with the main body 9a. Subsequently, on the side of the sub arm 26a, the holding pin 29a is retracted / retracted, and the holder / holder 1
Release the fitting with 2e.

Finally, the supporting arms 21 and 22 are swung to position the old holder 12 at the setup positions p2 and p3 of the die editing apparatus, and the stand-by state remains until the next replacement work. As described above, in the present embodiment, the rotary cylinder 29d of the holder holders 7d and 12e is synchronized with the rotation of the support arms 21 and 22.
Rotates (rotates) to maintain the vertical postures of the upper and lower molds 11 and 13, and in synchronization with the rotation of the sub arm 26a.
Since 9d rotates (rotates) to maintain the vertical positions of the upper and lower molds 11 and 13, the upper and lower molds 11 and 13 are always in the vertical position regardless of the rotation of the support arms 21 and 22 or the rotation of the sub arm 26a. Maintained at. Therefore, upper and lower mold 1
It is possible to reduce the operating space of the support arms 21 and 22 and the sub-arm 26a during the replacement operation of 1 and 13 and the space provided to avoid interference with other devices and mechanisms to the minimum necessary. Therefore, the press brake 1 can be downsized, the devices can be efficiently arranged, and the degree of freedom in design can be expanded.

[0011]

As described above in detail, according to the present invention, the member holding means holds the member in a fixed posture with respect to the horizontal plane at the tip of the sub-arm regardless of the turning of the support arm or the rotation of the sub-arm. Since the posture is maintained, the operating space of the support arm and the sub-arm, and the space provided to avoid interference with other devices and mechanisms can be reduced to the minimum necessary.

[Brief description of drawings]

FIG. 1 is a perspective view of a press brake.

FIG. 2 is a partial cross-sectional view of a mold holding device.

FIG. 3 is a plan view of the automatic mold changing device according to the embodiment.

FIG. 4 is a partially enlarged view of FIG.

FIG. 5 is a side view of the automatic mold changing device.

[Explanation of symbols]

7 ... Lower mold holder 11 ... Lower mold 12 ... Upper mold holder 13 ... Upper mold 15 ... Automatic mold changing device 16 ... Upper mold changing device 17. ..Lower mold exchanging device 20 ... Drive shaft 20a ... First hollow shaft
20b ... 2nd hollow shaft 21,22 ... Support arm 26a ... Sub-arm 29 ... Retainer 25 ... Rotating shaft 20d, 27 ... Sprocket 28 ...
Chain 24, 29b ... Sprocket 29c ...
・ Chains 20c, 20e, 25a ・ ・ Pulley 29e ・ ・
·chain

Continuation of the front page (72) Inventor Koho Nakamura, Oguchi-machi, Niwa-gun, Aichi No. 1 small character, small character boarding Yamazaki Mazatuku Co., Ltd. Headquarters factory

Claims (1)

[Claims] 1. A support arm pivotably positioned about a predetermined pivot axis, and a rotary arm rotatable about a horizontal axis of rotation orthogonal to the support arm, and a part of the support arm. A pair of sub-arms provided symmetrically about the rotation axis, holding means for holding a member arranged at the tip of the sub-arm in a fixed posture, and the turning angle in synchronization with the turning of the support arm. And a rotation synchronization means for rotating the holding means with respect to the support arm by the same angle as, and a rotation synchronization means for rotating the holding means with respect to the sub-arm by the same angle as the rotation angle in synchronization with the rotation of the sub-arm. And a member posture maintaining device comprising: