JP2546627B2 - Tube 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 tube bending apparatus, and more particularly to a processing apparatus for bending a tube for piping of an automobile or the like.

[0002]

2. Description of the Related Art A tube bending apparatus is used for two-dimensionally or three-dimensionally bending a brake pipe, a refrigerant pipe, and other pipes of an automobile.

Such a tube bending apparatus is generally a base, a bending roller supporting device provided on the base so as to horizontally project from one end of the base, and the bending roller supporting device. The bending roller is supported near the tip of the bending roller and is rotationally driven by the bending roller rotation driving device, thereby bending the tube along the outer peripheral surface, and linearly slidable displacement on the base toward the bending roller. A tube feed slide supported on the slide, a tube gripping claw which is mounted on the slide and which releasably grips a straight tube to be bent and which feeds along the outer peripheral surface of the bending roller, and a tube gripping claw. The tube rotation drive device that rotates the tube gripping claw so that the assembled tube rotates around its longitudinal axis, and it can move forward and backward with respect to the outer peripheral surface of the bending roller. In, and a tube pressing means pressing the tube to be bent by the roller outer peripheral surface bent by being pressed by the outer peripheral surface.

[0004]

In the conventional tube bending apparatus, the bending roller support device is installed along the same direction as the path of the unprocessed tube fed from the base to the bending roller. Therefore, in order to prevent the processed tube portion bent by the bending roller from interfering with the bending roller supporting device in the next bending, the angle of the next bending is 180 at maximum. There is no choice but to make it impossible to bend over 180 °.
It has the disadvantage of low processing flexibility.

Further, the operation mechanism of the pressing member pressed against the bending roller in order to hold the tube bent by the bending roller in the forming groove of the bending roller has hitherto been the same horizontal direction as the moving direction of the pressing member. Therefore, there is a problem that it takes up a lot of places.

Furthermore, the pipe joint member which is preliminarily fitted to the tube to be bent must be moved to a position where it comes into contact with the flared portion at the end of the tube after the final bending is completed. Has to be done manually.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to make it possible to increase the bending angle of a tube to 180 ° or more, thereby increasing the degree of freedom in bending the tube. It is to obtain a tube bending apparatus that can perform.

Another object of the present invention is to obtain a tube bending apparatus which does not increase the installation area by the tube pressing member.

Still another object of the present invention is to provide a tube bending apparatus in which a pipe joint member previously fitted to the tube is automatically moved to the end of the tube by the time of the final bending of the tube. is there.

[0010]

According to the present invention, in order to achieve the first object, the base is provided on the base so as to horizontally project from one end of the base. Bending roller support device, a bending roller which is supported near the tip of the bending roller support device and is rotationally driven by a bending roller rotation drive device, thereby bending the tube along the outer peripheral surface, and on a base, A tube feed slide supported so as to be linearly slidable and displaceable toward the bending roller, and a linear tube that is mounted on the slide and that is to be bent is releasably gripped so as to follow the outer peripheral surface of the bending roller. A feed tube gripping claw, a tube rotation drive device that rotates the tube gripping claw so that the tube gripped by the tube gripping claw rotates about its longitudinal axis, In a tube bending apparatus having a tube pressing means that is capable of advancing and retreating with respect to the outer peripheral surface of the roller and pressing a tube that is pressed by the outer peripheral surface and bent by the outer peripheral surface of the bending roller, from the tube gripping claw to the bending roller. With respect to the tube feed axis, the bending roller support device is configured to be inclined at an angle on the other side of the axis where the tube is bent by the bending roller.

According to the present invention, the bending roller rotation driving device is provided on a base, and the bending roller is connected to the bending roller rotation driving device through a transmission mechanism provided along the bending roller supporting device. ing.

In order to achieve the second object of the present invention, the tube pressing means includes a pressing member that contacts the outer peripheral surface of the bending roller to press the tube, and the pressing member contacts the outer peripheral surface of the bending roller. It is composed of an operating mechanism for displacing the pressing member so as to be in contact with and away from the pressing member, and the operating mechanism is configured as a vertical mechanism.

In order to achieve the third object of the present invention, the tube gripping claw has a closed position for gripping the tube, an open position for releasing the tube, and an intermediate position between the closed position and the open position. A driving means for restricting the half-open position is provided, and the half-open position is only for a pipe joint nut in which the grip claw is slidably fitted on the outer circumference of the tube for attachment to the tube end. It is defined to assume a radial position for engagement.

[0014]

In the inventions of claims 1 and 2, the unprocessed tube is gripped by the tube gripping claw on the base and sent toward the bending roller, and if necessary, rotated by a predetermined angle by the tube rotation drive device. To be Then, the tube holding means is pressed against the bending roller to hold the tube. Next, the bending roller is rotated by the rotation driving device, and a bending force is applied to the tip end portion of the tube projecting ahead of the bending roller, whereby bending is performed. At this time, since the bending roller support device forms an inclination angle with respect to the unprocessed tube feed axis on the side opposite to the side where the tube is bent by the bending roller, Interference does not occur easily, and even if the bending angle of the tube is 180 ° or more, bending can be performed without interference.

According to the third aspect of the present invention, since the operating mechanism of the pressing member for pressing the tube against the bending roller acts in the vertical direction, it does not take up a space in the horizontal direction.

According to the invention of claim 4, the pipe joint member in which the tube gripping claw in the half-opened position is fitted to the tube in advance by utilizing the movement of the tube gripping claw retracting after feeding the tube to the bending roller. Are automatically moved to the end of the tube by the last tube bending step.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall embodiment of a tube bending apparatus according to the present invention. In FIG. 1, reference numeral 1 is a base of an apparatus having legs 1a, on which a tube feed slide 2 is mounted. It is provided so as to be slidable in the direction of arrow A along the upper rail 3. The slide 2 integrally has a nut 5 at the bottom thereof, and a feed screw 6 is screwed into the nut 5. The feed screw 6 is rotatably supported by bearings 7, 7 and is rotationally driven by a tube feed motor M1. By the operation of the feed motor M1, the slide 2 is displaced leftward and rightward in FIG. 1 via the feed screw 6 and the nut 5.

On the slide 2, there is a tube T to be processed.
A tube gripping claw 8 that grips and feeds to the left in the figure is supported. As shown in FIG. 3, the tube gripping claw 8 is supported at its base end by a pin 9 on a bush 10, and this bush 10 can be rotated as shown by an arrow B via a hollow rotary shaft 12 fixed thereto. it can. For this rotation, a tube rotation drive motor M2 is mounted on the slide 2 as shown in FIG. Hollow rotating shaft 12
2 is a slide 2 as shown in FIG.
It is rotatably supported by the upper support 13 and can be rotated in the forward and reverse directions by the motor M2 via the pulley 11a, the timing belt 11 and the pulley 11b. Therefore, by rotating the motor M2 in either direction, the tube gripping claw 8 also rotates in the same direction via the hollow rotary shaft 12 and the bush 10, and therefore the tube T gripped by the tube T also rotates in the same direction. .

A drive device 14 for opening and closing the tube gripping claw 8 is mounted on the support 13. The opening / closing drive device 14 is composed of, for example, a hydraulic cylinder, and a coupling member 16 is fixed to a piston output shaft 15 of the hydraulic cylinder.
As shown in FIG. 3, 6 is integrally connected to a bifurcated engagement member 19 that straddles the tail end of a sliding tube 18 fitted on the outside of the hollow rotary shaft 12 on both sides. The fork of the engaging member 19 is in contact with the follower on the side of the sliding tube 18. The tip portion 18a of the sliding tube 18 is expanded in diameter and is in contact with the outside of the support arm 21 of the tube gripping claw 8 as shown in FIG. The base of the arm 21 is pivotally attached to the bush 10 by the pin 9, and the grip claw 8 can rotate around the pin 9 to grip or release the tube T. The output shaft 15 of the opening / closing drive device 14 is shown in FIG.
When the sliding tube 18 is pushed to the left via the connecting member 16 and the engaging member 19, the tip of the sliding tube 18 moves toward the arms 21 of the gripping pawls 8 around the pin 9. Rotate. Therefore, the grip claws 8 approach each other to grip the tube T. On the other hand, when the urging of the output shaft 15 in the arrow C direction is released, the grip claw 8 is opened by the force of the pulling spring 25 that constantly presses it outward. One end of the tension spring 25 is attached to the sliding tube 18 side, and the other end is attached to a pin 21a protruding from the arm 21 through the elongated hole 18b of the tip portion 18a.

The output shaft 15 of the drive unit 14 can take three positions in its axial direction. The three positions are a closed position in which the slide tube 18 is most advanced and the tube gripping claw 8 completely grips the tube T, and the slide tube 1
8 is the most retracted position so that the tube gripping pawl 8 fully releases the tube T, and the semi-open position where it is released slightly away from the tube gripping pawl 8 or tube T. The radial position of the tube gripping pawl with respect to the tube T in the half open position is as follows.

As shown in FIG. 4, the tube T has a straight tube shape before bending, and after bending, both ends of the tube T can be connected to joints of equipment such as automobiles. Members such as the male member 26 of FIG. In the example of FIG. 4, the joint member 26 is a tightening portion 26 using a wrench.
It also has a tubular portion having a and having a screw 26b formed on the outer periphery. Flares 27 are formed on both ends of the tube T. The flares 27 are formed when the pipe joint is tightened.
A seal portion is formed by being pressed between the tapered surface of the female member (not shown) and the tip tapered hole surface 29 of the male member 26. Two joint members 26 are fitted to both ends of the tube so that they can freely slide along the outer surface of the tube T. The half-open position of the tube gripping claw 8 is a radial position where the gripping claw 8 separates from the outer peripheral surface of the tube T but abuts at least the fastening portion 26a of the pipe joint member 26. When the slide claw 8 is retracted rightward in FIG. 1 along the tube T when the grip claw 8 is in such a half-open position, the grip claw 8 also retracts to the right. If there is a joint member 26 in the middle of the step, it abuts on it and slides it along the tube T to the right. The joint member 26 shown on the left side in FIG. 4 is fitted to the left end of the tube T shown in FIG. 1 in a state before the tube T is first passed through the tube bending apparatus shown in FIG. The joint member 26 shown on the right side in FIG. 4 is slidably fitted in the middle of the normal tube T in FIG.

The gripper opening / closing drive device 14 has position sensors S ₁ and S ₂ for detecting the position of the output shaft 15 thereof. When the output shaft 15 of the drive unit 14 reaches the closed position (the position where the tube gripping claw 8 holds the tube T) by moving the most forward, the sensor S ₁ sends a detection signal to the control unit 30, and the control unit 30 drives the drive unit. In order to stop the forward movement operation of the hydraulic pressure control valve 14, the pressure oil switching valve device 31 for the drive device (cylinder) 14
To switch. When the output shaft 15 reaches the half-opened position (the position where the tube gripping claw 8 separates from the tube T but contacts the pipe joint member 26) slightly retracted from the most advanced position, the sensor S ₂ controls the detection signal. It is sent to the device 30, the pressure oil switching valve device 31 is switched, and the drive device 14 is stopped at that position. Although the drive device 14 has been described as a hydraulic cylinder, any other drive device for driving the grip claw 8 to open and close can be used. The action of the tube gripping claw 8 held in the half open position will be described later.

The feeding mechanism of the tube T to be worked has been described above. The bending process of the tube T fed to the left in FIG. 1 by this feeding mechanism will be described.

A bending roller 33 is provided at the portion where the tip of the tube T reaches. The principle of bending the tube T by the bending roller 33 is as shown in FIG. The bending roller 33 is rotationally driven in the direction of arrow D about the axis 0-0. The bending roller 33 is basically a cylindrical roller, but has a sector-shaped notch 33a in the axial direction and a flat receiving surface 33b that makes surface contact with a pressing surface 34a of a tube pressing member 34, which will be described later. Have in the department. The receiving surface 33b is preferably formed by a block-shaped separate member fitted to the peripheral surface of the bending roller 33 as shown in the drawing.
A circumferential groove 36 having a semicircular cross section is formed on the outer circumference of the bending roller 33. This groove will be referred to as a forming groove hereinafter. As shown in FIG. 6, which is a cross section taken along line 6-6 of FIG. 5, the molding groove 36 has a ring shape corresponding to the circular cross section of the tube T to be processed.

The tube T is formed by the forming groove 36 of the bending roller 33.
After being passed through, the raw tip portion T ₁ is passed through the forming groove 36 and then linearly projected as shown by the solid line. As shown in FIGS. 1 and 4, the pipe joint member 26 is previously fitted to the tip of the tip portion T ₁ . Then, as the bending roller 33 rotates in the direction of the arrow D, a bending force E is applied to the unprocessed tip portion T ₁ that linearly projects, and the tip portion T _1
As indicated by an imaginary line, ₁ is bent by being guided by the forming groove 36 to form a bent portion t ₁ . Before the bending process is started, the pressing member 34 is displaced in an arc shape in the direction of the arrow F and pressed against the receiving surface 33b of the bending roller 33, and the tip portion T ₁ is formed with the forming groove 36 of the bending roller 33 and the pressing member 3.
It is sandwiched by the groove 34b having a semi-circular cross section of _{No. 4} and the trailing tube portion thereof is prevented from coming off the forming groove 36 when the tip portion T ₁ is bent. When the tube tip portion T ₁ is bent to the imaginary line position, the notch 33a of the bending roller 33 is rotated to the position indicated by the imaginary line. A guide roller 37 is installed adjacent to the bending roller 33 on the upstream side of the tube T fed to the bending roller 33. This guide roller 37
Has a guide groove 38 for guiding the tube T to the outer periphery, it is freely rotate freely in the axial 0 ₁ -0 around _1. The guide roller 37 also acts to receive a reaction force due to bending of the tube tip portion T ₁ .

The tube tip portion is bent at the bending portion t ₁ as described above, and the bending surface is a plane orthogonal to the axis 0-0 of the bending roller 33. This plane is designated P ₁ in FIG. Generally, after the first bending process, the second and subsequent bending processes are sequentially performed at different positions. The bending work after the second time is the plane P ₁
7 may be performed in the same plane as the above, but an example performed in a different plane is shown in FIG. In this example, the tube T
The tube gripping claw 8 grabs the tube and further feeds it by a predetermined distance L by the rotation drive of the feed motor M1. Then, the bending portion t ₂ is set to the position of the bending roller 33, and the tube T is rotated by the angle θ. After rotating, the bending process similar to the above is performed. As a result, bending is performed in the plane P ₂ forming an angle θ with the plane P ₁ . To rotate the tube T by the angle θ,
The tube rotation drive device M2 shown in FIG. At this time, the tube gripping claw 8 is gripping the tube T. The above bending process is performed a desired number of times at a desired position and angle.

The bending roller 33 and the guide roller 37.
Fig. 8 is a plan view of this tube bending apparatus.
As shown in FIG. 3, the bending roller support device 40 is supported by the tip end portion thereof. The bending roller support device 40 is provided so as to horizontally project from one end of the base 1. The bending roller support device 40 is arranged so as to form an inclination angle α described below with respect to the feeding direction of the tube T on the base 1.

As shown in FIG. 1, a bending roller rotation driving device M3 is fixed inside the base 1. This rotary drive M3 can be an electric motor. The bending roller rotation drive device M3 has a rotation axis 41, an output sprocket 42 is fixed to an output shaft on the axis, and a chain 43 hung on the output sprocket 42 is fixed to the rotation shaft of the bending roller 33. It is hung on the drive sprocket 45. 9 is a side view of FIG. 8 seen from the front side.
In, the bending roller 33 at the top has a bending roller shaft 33c integrally extending downwardly therefrom, and the driven sprocket 45 is attached to the bending roller shaft 33c.

In FIG. 8 which is a plan view, the output shaft of the bending roller rotation driving device M3 is indicated by 47, and the chain 43 is attached to the output sprocket 42 attached thereto.
Is hung. The sprockets 42, 45, the chain 43, etc. constitute a transmission mechanism. And the chain 4
3 is arranged along the bending roller supporting device 40 at an inclination angle α with respect to the tube feeding direction.

As shown in FIG. 8, the guide roller 37 is rotatably supported by the shaft 37a at the tip of the guide roller support 50. The guide roller support body 50 is supported on the support frame 51 so that the position thereof can be adjusted in the longitudinal direction of the support frame 51 (the horizontal direction in FIG. 8), and the position thereof can be adjusted by an adjusting screw 52. And the adjusted position is
It is adapted to be fixed by tightening a fixing screw 53 screwed into the support frame 51 through the elongated hole of the guide roller support body 50. The support frame 51 includes a rotating member 56 pivotally attached to the body of the bending roller supporting device 40 by a pin 55.
Is integrally supported by the rotary member 56, and the rotating member 56 is
7 receives a force to rotate upward in FIG. A piston rod 59 of an air cylinder 58 fixed to the main body of the bending roller support device 40 is connected to a rotating member 56 via a member 60.

In the state shown in FIG. 8, air is supplied to the back of the piston of the air cylinder 58, the piston rod 59 advances, and the turning member 56 and the guide roller support 50 are shown against the force of the tension spring 57. Held in position. In this position, the guide roller 37 is in the predetermined working position described above with reference to FIG. The predetermined position of the guide roller 37 is obtained by adjusting the adjusting screw 52.

When the air behind the piston of the air cylinder 58 is discharged, the piston rod 59 is pushed into the air cylinder 58 by the force of the tension spring 57, and at the same time, the rotating member 56.
And the guide roller support 50 supported by the pin 5
5 rotates counterclockwise around 5 to take the position shown in FIG. 10, and the guide roller 37 at the tip of the guide roller support 50 moves away from the tube T and retracts.

Next, a mechanism for moving the tube pressing member 34 (FIG. 5) forward and backward with respect to the bending roller 33 will be described. In FIG. 11, the pressing member 34 is a link 60.
It is fixed at the tip of. One end of the link 60 is pivotally attached to the bending roller support 35 by a pin 34a, and its base end is pivotally attached to the tip of the link 62 by a pin 61.
The base end of the link 62 is pivotally attached to the tip of the piston rod 65 of the air cylinder 64 by a pin 66. The base end of the air cylinder 64 is pivotally attached by a fixing pin 67. A mechanism 69 extending from the link 60 to the air cylinder 64 constitutes an operation mechanism extending in the vertical direction of the pressing member 34.

The air cylinder 64 is not operating in FIG.
In this state, the piston rod 65 retracts and the operating mechanism 6
9 also descends downward, and the link 60 at the tip is directed in a substantially vertical direction, so that the tube pressing member 34 is rotated clockwise around the pin 34a so as to be separated from the bending roller 33. On the other hand, as shown in FIG. 9, the air cylinder 6
4 operates and the piston rod 65 moves upward,
The link 62 is pushed up, and the link 60 is rotated counterclockwise around the pin 34a via the link 62. Therefore, the tube pressing member 34 rotates toward the bending roller 33 and is pressed against it.

Next, the operation of the tube bending apparatus described above will be described. The tube T that undergoes bending is
Two pipe joint members 26 are fitted in advance as shown in FIG. 4, and flare processing 27 is applied to both ends.
As shown in FIG. 1, such a tube T is passed through the hollow rotary shaft 12 and the bush 10 from the right side to the left side, and one pipe joint member 26 is positioned at the most distal end thereof,
As shown in FIG. 10, the tip of the tube T is bent by the bending roller 3
Follow 4. At this time, the air cylinder 58 is deactivated so that the guide roller 37 escapes backward from the path of the tube T. On the other hand, as shown in FIG. 11, the air cylinder 64 is also deactivated so that the tube pressing member 34 is separated from the bending roller 33. By doing so, it is possible to easily insert the distal end of the tube into the bent portion from above.

Next, the air cylinders 58 and 64 are operated to move the guide roller 37 forward to the working position of FIG. 8 and the tube pressing member 34 to the working position of FIG. As a result, the guide roller 37 takes the position shown in FIG. 5, and the tube pressing member 34 contacts the bending roller 33. In this initial state, the tip portion T ₁ of the tube T is in a straight line state shown by an imaginary line in FIG.

In this state, the bending roller rotation driving device M3
When the bending roller 33 is driven to rotate in the direction of arrow D in FIG.
Is bent. As described above, the tube pressing member 34 bends the tube being processed into the forming groove 3 of the bending roller 33.
The guide roller 37 guides the tube and receives the bending reaction force. Bending angle β of tip T ₁
(FIG. 8) can be any angle.

In this way, after the first bending process, the tube pressing member 34 and the guide roller 37 are retracted. Next, the grip claw 8 is closed by operating the grip claw opening / closing drive device 14 (FIG. 1), and the tube T is gripped, and the slide 2 is advanced by the operation of the tube feed motor M1 to direct the tube T toward the bending roller 33. Send a predetermined amount. At this time, when the surface of the bending work is different from the surface of the previous bending work, the tube rotation driving device M2 is operated to rotate the grip claw 8 through the hollow rotary shaft 12 by a predetermined angle, and the tube T is twisted. . Then, after advancing the tube pressing member 34 and the guide roller 37 to a predetermined position again,
The second bending process is performed. Such a bending process can be similarly performed after the third time.

By the way, as shown in FIG.
The number of processed tubes increases three-dimensionally as it is turned and bent. Such a processed tube portion is bulky on the left side of the route in which the unprocessed tube T is sent toward the bending roller 33 in FIG. 8, that is, on the side where the tube portion being processed is sent out from the bending roller 33. Will increase. When the machined tube portion is increased in volume as described above, it is caused by the bending roller supporting device 4
Since it interferes with 0, the bending angle β in FIG. 8 cannot be set large.

In the conventional tube bending apparatus, the bending roller supporting device 40 is provided in parallel with the direction in which the tube T is fed from the base 1. That is, the one corresponding to the bending roller supporting device 40 was arranged in the vertical direction in FIG. In such an arrangement, the angle β may be large because the machined part of the tube interferes with the bending roller support device 40 during the next bending process before the machined part of the tube increases too much. There is a problem that it can not be done, especially the bending angle β of the tube is 180 °
It was not possible at all to allow the processed bent tube section to cross the feed path of the unprocessed tube.

On the other hand, in the present invention, the bending roller supporting device 40 is provided so as to be inclined at an angle α with respect to the feed path of the unprocessed tube. That is, in the present invention, the bending roller supporting device 40 is provided with the raw tube feed device on the other side (right side) opposite to the one side (left side in FIG. 8) with respect to the raw tube feed axis where the tube is bent by the bending roller 33. It is provided so as to form an angle α with the axis. Therefore, this inclination angle α
Therefore, the bending angle β of the bending roller 33 is set to 18
Even at 0 ° or more (180 ° + α °), it is possible. Therefore, because of the inclination angle α, the degree of freedom in bending the tube is improved, and the space Q in FIG. 8 can be effectively used.

On the other hand, particularly as shown in FIGS. 9 and 11, an operating mechanism 69 for moving the tube pressing member 34 toward and away from the bending roller 33 is provided in the vertical direction. In the conventional tube bending apparatus, the operation mechanism is designed to occupy a place indicated by a space R shown in FIG. 8, for example, because the tube pressing member 34 laterally approaches and separates from the circumferential surface of the bending roller. However, this has a drawback that the entire apparatus becomes large.

However, the bending mechanism 3 is provided by arranging the operation mechanism 69 of the tube pressing member 34 in the vertical direction.
A space-saving configuration can be achieved by utilizing the installation height range of the installation of FIG. That is, the space R in FIG. 8 is empty, and this portion can be effectively used.

When the feeding of the tube T to the bending roller 33 is completed as described above, the feed motor M1 is reversely rotated and the slide 2 is retracted for the next feeding. At this time, the grip claw 8 is set to the half open position by the action of the grip claw opening / closing drive device 14. Drive device 1
4 stops when the sensor S ₂ detects the half-open position, and holds that position. The gripping claw 8 stays in the half open position and the tube T
When the retreat is started along, the gripping claw 8 abuts on the pipe joint member 26 remaining on the raw tube portion, and the pipe joint member 26 is slid rearward with the retreat movement. By repeating this backward sliding, the pipe joint member 26 takes the predetermined position shown on the right side of FIG. 4 after the final bending process.

[0045]

In the tube bending apparatus according to the first and second aspects of the present invention, the bending roller support device is installed with an inclination angle that does not cause interference with the bent tube portion even when bending by 180 ° or more. Therefore, the flexibility of bending the tube is increased.

In the tube bending apparatus according to the third aspect of the present invention, since the pressing member for pressing the processing tube against the bending roller is operated by the vertical operating mechanism, a space-saving structure as in the conventional case can be obtained.

Further, in the tube bending apparatus according to the fourth aspect, the tube gripping claw holds the tube, sends it to the bending roller, and then takes a half-open position when returning to the pipe joint member left on the tube. The effect is to abut and automatically move it to the end of the tube.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a tube bending apparatus of the present invention.

2 is a schematic right side view of the upper portion of FIG. 1. FIG.

FIG. 3 is a principle diagram of a tube gripping claw operating mechanism in the upper portion of FIG.

FIG. 4 is a partial cross-sectional explanatory view showing a tube and pipe joint members at both ends thereof.

FIG. 5 is a perspective view showing a bending roller, a tube pressing member, and a guide roller.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is an explanatory view of the bending process of the tube.

FIG. 8 is a plan view of the left end portion of FIG.

9 is a side view seen from the front side of FIG. 8. FIG.

10 is a plan view similar to FIG. 8 in a state different from FIG.

11 is a plan view similar to FIG. 9 in a state different from FIG.

[Explanation of symbols]

1 base 2 feed slide 3 rail 5 nut 6 feed screw M1 tube feed motor T tube 8 tube gripping claw M2 tube rotary drive device (motor) 11 timing belt 12 hollow rotary shaft 14 gripping claw open / close drive device (cylinder) 15 Output shaft 18 Sliding pipe 26 Pipe joint member 27 Tube flare 30 Control device S ₁ , S ₂ Position sensor 33 Bending roller 33c Bending roller shaft 34 Tube holding member 36 Forming groove 37 Guide roller 40 Bending roller support device M3 Bending roller rotation Drive device (motor) 42 Output sprocket 43 Chain 45 Driven sprocket 50 Guide roller support 51 Support frame 52 Adjustment screw 57 Tension spring 60 Link 64 Air cylinder 69 Holding member operating mechanism

Claims (4)

(57) [Claims] 1. A base, and a bending roller supporting device provided on the base so as to horizontally project from one end of the base,
A bending roller which is supported near the tip of the bending roller supporting device and is rotationally driven by a bending roller rotation driving device, thereby bending the tube along the outer peripheral surface, and a straight line on the base toward the bending roller. A tube feed slide that is supported so that it can be slidably displaced, a tube gripping claw that is mounted on this slide and that releasably grips a straight tube that is to be bent and that feeds it along the outer peripheral surface of the bending roller. A tube rotation drive device that rotates the tube gripping claw so that the tube gripped by the tube gripping claw rotates around its longitudinal axis, and a tube rotation drive device that can move forward and backward with respect to the outer peripheral surface of the bending roller and is pressed against the outer peripheral surface. And a tube pressing device that presses a tube to be bent on the outer peripheral surface of the bending roller. With respect to the tube feed axis from the tube gripping claw to the bending roller, the bending roller support device is tilted to form an angle on the other side of the axis on which the tube is bent by the bending roller, opposite the one side. A tube bending device characterized in that 2. The bending roller rotation driving device is provided on a base, and the bending roller is connected to the bending roller rotation driving device through a transmission mechanism provided along a bending roller supporting device. The tube bending apparatus according to claim 1, which is characterized in that. 3. A pressing member, wherein the tube pressing means abuts on an outer peripheral surface of a bending roller to press the tube, and an operation of displacing the pressing member so that the pressing member abuts and separates from the outer peripheral surface of the bending roller. It consists of a mechanism and
The tube bending apparatus according to claim 1, wherein the operating mechanism is configured as a vertical mechanism. 4. The tube gripping claw has drive means for restricting the closed position for gripping the tube, the open position for releasing the tube, and the half open position intermediate between the closed position and the open position. The half-open position is defined such that the gripping claw is in a radial position in which only the fitting nut that is slidably fitted to the outer circumference of the tube for mounting on the tube end is engaged. The tube bending apparatus according to claim 1.