JP2641120B2 - Bending length changing device of bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending length changing device for a bending machine.

[0002]

2. Description of the Related Art For example, when bending the edge of a rectangular middle window of a door panel made of a plate material, it is necessary to use bending dies having different bending lengths for the long side and the short side of the rectangle.

[0003] One of the bending dies, for example, a lower die is composed of a plurality of die portions successively extending in the direction of the bending length, and a lever for vertically lifting these die portions is provided. It has already been proposed by the applicant that the mold portion is supported from below by a plurality of spacers attached thereto and the bending length is changed by selecting the number of these spacers (Japanese Patent Application Laid-Open No. 64-57922). In this configuration, since the spacers receive the force required for bending, these spacers must be rigidly and heavily configured, and a large power is required to drive the endless entrainment that entrains the spacers. Also, a large torque must be applied to the lever to lift many mold parts.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bending length changing device which has a simple structure and does not require much power for driving an endless driver and a lever.

[0005]

According to the present invention, in order to solve this problem, a plurality of bending dies for bending a plate in cooperation with a mating bending die are provided in succession in the direction of the bending length. A pair of groove-shaped recesses which are formed by a circular hole and which are swingably supported on a horizontal cylindrical support shaft, the support shafts being diametrically opposed to each other and extending in the axial direction. The end portion has a pair of grooves which are open to this hole facing each other on the diameter of the hole, and are guided in the groove-shaped recess of the support shaft in the axial direction. A plurality of connecting pieces that can be fitted into the groove of the support shaft and the groove of the mold portion are mounted along the means, and means are provided for rotating the support shaft about 90 ° about its axis.

[0006]

According to the present invention, the piece attached to the endless entrainment body is small and light in weight because it only connects each mold part to the support shaft and does not receive the force associated with bending. And the power for circulating the endless entrainment body is small. In addition, since the support shaft is only rotated by 90 ° to bring the mold part to the inoperative position, less power is required for that.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a lower die, which is one of the bending dies of a bending machine, is composed of a plurality of die portions 1 which successively and horizontally follow a bending length extending at right angles to the paper surface. The mold portion 1 is swingably supported on a horizontal cylindrical support shaft 3 by a circular hole 2 provided at a lower portion. The mold part 1 supported on the support shaft 3 is likewise swingably supported in an arc-shaped recess of the fixed lower mold block 4. Lower block 4
Supports the left vertical side of the mold part 1 in the illustrated upright position, but here the mold part 1 is connected via another lower mold 6 which is fixed to the lower mold block 4 in order to multiply work the plate 5. I support it. The lower mold block 4 has a horizontal support surface 7 for supporting the right side of the mold part 1 which is swung clockwise 90 degrees from the illustrated standing position and assumes a rollover position indicated by a chain line. The support shaft 3 is formed with a pair of groove-shaped recesses 8 that extend in the axial direction so as to face each other in diameter. In these recesses 8, the horizontal upper and lower sides of an endless chain 9 as an endless entraining body are formed. Each is guided. The mold portion 1 is also formed with a pair of grooves 11 which are opposed to each other on the diameter of the hole 2 and open to the hole 2. The link piece 1 with a specific interval on the endless chain 9
0 (FIG. 4) is fitted and fitted into the recess 8 of the support shaft 3 and the groove 11 of the mold portion 1 which are mutually coincident in the circumferential direction.
The support shaft 3 and the mold part 1 can be connected to each other in the circumferential direction. Thus, by turning the support shaft 3 90 ° clockwise from the position shown, the mold part 1 can assume the rollover position of the chain line resting on the support surface 7 of the lower mold block 4. As shown in FIG. 3, the endless chain 9 is looped around a chain wheel 15 and is driven to circulate by an electric motor (not shown). Mold part 1
The housing 16 containing the chain wheel 15 and the endless chain 9 wrapped around the wheel outside the region where the shaft is present is connected to the support shaft 3 and, as described above, by the operating cylinder 18 via the lever 17 projecting from the housing. It can rotate about 90 °.

In order to obtain a desired bending length, the number of mold parts 1 corresponding to the bending length must be in the upright position in FIG. For this purpose, the operating shaft 18 rotates the support shaft 3 together with the endless chain 9 clockwise from the position shown in FIG.
Take the rollover position of the chain line above. Then the chain wheel 1
The endless chain 9 is moved via 5 so that only the number of mold portions 1 corresponding to the bending length is connected to the support shaft 3 via the piece 10 on the endless chain 9. If the support shaft 3 is returned by 90 ° counterclockwise, the mold part 1 connected to the support shaft 3
Only the upright or operating position, and these mold parts 1
Thereby, bending can be performed with a desired bending length. Mold part 1 not connected to support shaft 3 via piece 10
Stays in the rollover position.

In order to perform multiple bending, in addition to the upper mold 20 which is moved up and down by a ram (not shown), an arrow 2 is inserted so that the middle mold upper mold 21 enters the elevating track of the upper mold 20.
The upper holder 2 is guided vertically movably by a movable member 23 that can move horizontally in the direction 2 and is suspended by a spring 24.
5 attached. When the middle window bending mold 21 is used, the upper mold 20 serves to push down the middle window bending mold 21 similarly to the ram. A back-up mechanism 26 is provided to support the middle window bending mold 21 to which a reaction force is applied at the time of bending (FIG. 2), and an elevating strip 28 supported by the lower mold block 4 so as to be able to move up and down by a spring 27 is provided. It engages with the back surface of the tongue piece 29 protruding from the lower end of the descending upper mold holder 25 to guide the descending upper mold holder 25 of the middle window bending mold 21 and prevent the middle window bending mold 21 from tipping over. I do. In order to fix the lifting strip 28 at the raised position, a locking mechanism 33 having a projection 32 which is operated by the operation cylinder 30 and engages with the notch 31 of the lifting strip 28 is provided.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of a bending machine provided with a bending length changing device.

FIG. 2 is a vertical sectional view corresponding to FIG. 1 of a main part of the bending machine in an operating position.

FIG. 3 is a front view of a main part of the bending machine.

4A is a front view of a chain having a piece, FIG. 4B is a cross-sectional view taken along line IVb-IVb, and FIG.
It is sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold part 2 Circular hole 3 Cylindrical support shaft 8 Groove recess 9 Endless entrained body (endless chain) 10 Connecting piece 11 Groove 17 Lever 18 Operating cylinder

Claims (1)

(57) [Claims] A bending die for bending a plate material in cooperation with a counterpart bending die comprises a plurality of die portions (1) successively and horizontally extending in the direction of the bending length, and these die portions (1). Are swingably supported on a horizontal cylindrical support shaft (3) by a circular hole (2), and the support shaft (3) is diametrically opposed to each other and extends in a pair of groove-shaped recesses ( 8), the mold part (1) has a pair of grooves (11) facing each other on the diameter of the hole (2) and opening to this hole, and the groove-shaped recess (8) of the support shaft (3). The endless driver (9) guided in the axial direction in the parentheses)
Along the length, a plurality of connecting piece pieces (10) that can be fitted into the groove-shaped recess (8) of the support shaft (3) and the groove (11) of the mold part (1) are attached and supported. A device for changing the bending length of a bending machine, characterized in that means are provided for rotating the shaft (3) about 90 ° about its axis.