JPS632172Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bending machine, and particularly to a bending angle adjustment mechanism for a bending machine.

Many press bending machines are known that bend a workpiece at a predetermined angle by rotating a bending roller around a bending guide. In known bending machines, the bending rollers are supported on pivot arms that are fixed to a shaft. The shaft is rotated by a predetermined angle together with the rotating arm and the bending roller by the driving force from the motor, and the bending process is performed by the bending roller. The bending angle of the bending roller is generally set by adjusting the rotation angle of a rotation arm, and known press bending machines are generally equipped with a bending angle adjustment mechanism that combines a stopper pin and a switch. The switch is previously disposed at a predetermined angular position, and the stopper pin is inserted into a corresponding one of a number of holes formed on the circumferential surface of the rotating arm. Because of this structure, when the shaft rotates due to normal rotation of the motor, the stopper pin also rotates around the shaft along with the rotating arm, and when the shaft rotates by a predetermined angle, the stopper pin comes into contact with a preset switch. You can flip the switch. A stopper pin operates a switch which reverses the motor and returns the shaft to its initial position. Further, when bending at the same bending angle is continued, the series of operations of normal rotation of the motor, switching of the switch, and reversal of the motor are repeated. However, bending at a different bending angle is accomplished by removing the stopper pin from the mounting hole and replacing it with another corresponding mounting hole. Such a known bending angle adjustment mechanism using a stopper pin and a switch has the disadvantage of poor operability since the stopper pin must be replaced each time the bending angle changes. Furthermore, since the stopper pin is replaced from outside the housing, the rotating arm and the shaft must be provided adjacent to the housing, which has the disadvantage of restricting design freedom.

The object of this invention is to provide a bending angle adjustment mechanism for a press bending machine that eliminates the drawbacks of the known techniques as described above.

An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, the bending machine 10 bends a workpiece, such as a reinforcing bar 18, by having a bending roller 16 revolve around a bending guide 14 located on the upper surface of a housing 12. Rebar 1
The amount of feed is determined by the tip of 8 coming into contact with a stopper 20, and the amount of feed can be changed by making the stopper movable. The bending roller 16 moves while being guided within an arcuate guide groove 22 formed on the upper surface of the housing, and the block 24 prevents the reinforcing bar 18 held between the bending roller and the bending guide 14 from sagging to the side. has been done.

As can be seen in FIG. 2, the bending roller 16 is supported by a pivot arm 26 which is secured to a first shaft 30 located on a base 28 within the housing 12. Also housing 1
A second shaft 36 is rotatably supported by a support 34 on the second side wall 32. And first,
A belt-like connecting means such as an endless belt 42 is stretched between the pulleys 38 and 40 of the second shafts 30 and 36, and a tension pulley 44 disposed on the support 34 applies appropriate tension to the endless belt. . Since the first and second shafts 30 and 36 are connected by the belt-like connecting means in this way, the mounting positions of the first and second shafts can be freely selected. Furthermore, at least one, for example two, angle setters 4 are provided on the second shaft 36.
6 and 48 are rotatably mounted apart from each other in the axial direction. The angle setters 46 and 48 have appropriate angle scales on their surfaces, and a portion of the angle setters 46 and 48 are attached to the side wall 32 of the housing so that they can be rotated from the outside.
It protrudes more outward.

When the first shaft 30 is rotated by the driving force from a motor (not shown), the rotation arm 26
rotates integrally with the first shaft, and bending is performed by a bending roller 16 on the rotating arm.
For example, when bending the reinforcing bar 18 by 90 degrees as shown by the imaginary line in FIG. 1, it detects that the first shaft 30 has rotated by a predetermined angle and reverses the motor to return the first shaft to its initial position. Sensor means 49 are arranged within the bending machine 10.

As can be seen in FIG. 2, the sensor means 49 includes a first sensor 50 fixed to the angle setters 46, 48 and a second sensor 52 fixed to the second shaft 36. First,
The second sensors 50, 52 can be easily constructed from a combination of various switching means, such as a combination of a light emitting member and a light receiving member, or a combination of a switch such as a proximity switch or a limit switch and a switch operation member such as a cam or a stopper pin. . When the light-emitting member and the light-receiving member are aligned and the light-receiving member receives an optical signal from the light-emitting member, or when the switch is switched by the switch operation member, the sensor means 49 detects a predetermined angle of the second shaft 36. Rotation is detected. For example, assume that the angle setter 46 sets a bending angle of 90 degrees as shown in FIG. 3A. At this time, the second sensor 52 on the second shaft 36 is circumferentially spaced apart from the first sensor 50 on the angle setter 46 by a certain angle, for example, 90 degrees. Rotate the motor forward and rotate the first shaft 3.
0, the second shaft 36 also rotates in conjunction with the first shaft via the endless belt 42. The second sensor 52 on the second shaft 36 also rotates together with the second shaft as shown by the arrow in FIG. 3A, and when the second sensor aligns with the preset first sensor 50, The sensor means 49 reverses the motor to the first shaft 3.
0 to its initial position. Here, the rotation angles of the first and second shafts 30, 36 generally do not match the bending angles by the bending rollers, but for ease of understanding, the rotation angles of the second shafts are shown to match the bending angles in FIG. 3A. I'm letting you do it. If a 90 DEG bend is followed by a 135 DEG bend, for example, another angle setter 48 is preset to a 135 DEG bending angle, as shown in FIG. 3B. 90
After the reinforcing bar 18 has been bent by .degree., it is fed until it comes into contact with the stopper 20, and then the motor rotates normally again, causing the first and second shafts 30 and 36 to rotate. and the second
When the second sensor 52 on the shaft 36 rotates in the direction of the arrow and is aligned with the first sensor 50 on the angle setter 48, the motor is reversed by a signal from the sensor means 49 and the first shaft is rotated. 3
0 to its initial position. In this way, the bending angles preset by the angle setters 46 and 48 are sequentially processed by controlling the operation of the motor using signals from the sensor means to the motor. The motor is controlled by the sensor means using a known electric circuit. Also, if a 135° bend is to be performed first and then a 90° bend is to be performed, the sensor means may be programmed in advance to operate effectively in the desired order. It goes without saying that by properly arranging the angle setter and corresponding programming, any bending process can be performed continuously.

As described above, according to this invention, the bending angle adjustment mechanism of the bending machine includes a fixed first shaft of a rotary arm that supports a bending roller, and a diameter that is adjusted appropriately relative to the diameter of the first shaft. is selected, and a second shaft is connected to the first shaft via a belt-like connecting means to rotate in conjunction with the first shaft in accordance with the diameter ratio of the first shaft; an angle setter with an angle scale that is rotatably attached to the second shaft, a portion of which protrudes from the housing housing the first and second shafts, and can be rotated from outside the housing. There is. Furthermore, the bending angle adjustment mechanism includes a first sensor attached to the angle setter and a second sensor attached to the second shaft, and by rotating the angle setter, the bending angle can be adjusted to a preset angle. The rotation of the second shaft from the initial position is detected by the cooperative action of the first and second sensors, and the rotation of the first shaft is stopped and the first shaft is returned to the initial position. It is equipped with sensor means for returning the . In this way, in this invention, a second shaft is provided separately from the first shaft to which the rotating arm is fixed, and an angle setter with an angle scale is rotatably attached to the second shaft. The bending angle is then set using an angle setter. Therefore, the bending angle can be set steplessly over a wide range.
In addition, since the first and second shafts are connected by a belt-like connecting means such as an endless belt, the positions of the first and second shafts can be set freely as long as a part of the angle setter protrudes from the housing. This increases design freedom. Furthermore, the sensor means is configured to detect a second
Since the rotation of the first shaft is controlled through the second shaft, accurate control can be performed. In addition, the rotation angles of the first and second shafts will not be the same unless their diameters are the same. Therefore, by appropriately selecting the diameter of the second shaft, the rotation angle of the second shaft can be expanded or reduced relative to the rotation angle of the first shaft. Therefore, the second
It is possible to set the angle of the angle setter attached to the shaft over a wide range of 360° or more, and it can also be done extremely accurately in a narrow range.

The above-mentioned embodiments are for explaining this invention and are not intended to limit this invention in any way.
It goes without saying that all modifications, modifications, etc. made within the technical scope of this invention are also included in this invention. For example, a chain belt or the like may be used instead of an endless belt as the belt-like connecting means, and two or more angle setters may be set depending on the type of bending to be performed on the workpiece. Needless to say.

[Brief explanation of the drawing]

1 and 2 are a plan view and a vertical sectional view of a part of the bending machine equipped with the bending angle adjustment mechanism according to the invention, and FIGS. 3A and 3B are respective angles of the bending angle adjustment mechanism. It is a top view of a setter. 10...Press bending machine, 12...Housing, 16
... Bending roller, 18 ... Reinforcing bar, 26 ... Rotating arm, 30, 36 ... First and second shafts, 4
2... Endless belt, 46, 48... Angle setter, 49... Sensor means, 50, 52
...First and second sensors.

Claims (1)

[Claims for Utility Model Registration] (1) A first shaft on which a rotating arm supporting a bending roller is fixed, the diameter of which is appropriately selected relative to the diameter of the first shaft; a second shaft that is connected to the first shaft through a belt-like connecting means and rotates in accordance with the diameter ratio with the first shaft; An angle setter with an angle scale that partially protrudes from the attached housing housing the first and second shafts and can be rotated from outside the housing, and a first sensor and a second sensor attached to the angle setter. and a second sensor attached to the shaft, which detects whether the second shaft has rotated from the initial position to a preset angle by rotating the angle setter.
A bending angle adjustment mechanism for a press-bending machine, comprising: sensor means for detecting and detecting the rotation of the first shaft by the cooperative action of the sensors, and for returning the first shaft to its initial position; . (2) a plurality of angle setters are axially spaced and mounted on the second shaft, and the sensor means is adjacent to the first sensor corresponding to the plurality of first sensors mounted on each angle setter; A bending angle adjustment mechanism for a press-bending machine according to claim 1, further comprising a plurality of second sensors fixed to a second shaft. (3) The first and second sensors of the sensor means each include a light-receiving member and a light-emitting member, and when the light-receiving member and the light-emitting member are aligned and the light-receiving member receives light from the light-emitting member, the second sensor
A bending angle adjustment mechanism for a press-bending machine according to claim 1 or 2, which detects rotation of a shaft at a predetermined angle. (4) The first and second sensors of the sensor means each consist of a switch or a switch operating member, and detect rotation of the second shaft by a predetermined angle by switching the switch using the switch operating member. A bending angle adjustment mechanism for a press-bending machine according to claim 1 or 2, which has been registered as a utility model.