JP2001347418A - Cutting device of pipe material and work device having this cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smooth bending work when manufacturing hairpin type heat transfer pipes of an air conditioner by restraining rewind of an LWC material to a bobbin without largely changing existing equipment when returning the LWC material in a hairpin bender for sending out the LWC material(level wound coil material) wound on the bobbin toward a bending mechanism by a sending mechanism and returning the LWC material once by a return mechanism after being cut in a prescribed dimension by a cutting mechanism. SOLUTION: A rewind preventive unit 50 is provided for preventing the rewind to the bobbin b by applying pressing force to the delivery directional side to the LWC material P so as to absorb looseness generated according to a return by the return mechanism 5 in the LWC material P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for a tube material wound around a bobbin such as a level wound coil material which is a material of a hairpin type heat transfer tube of an air conditioner, and a processing device provided with the cutting device. The present invention relates to a countermeasure for avoiding unwinding of the fed pipe.

[0002]

2. Description of the Related Art Generally, when a hairpin type heat transfer tube used for an air conditioner is manufactured, a tube material wound around a bobbin (hereinafter referred to as LWC) is used as a tube material.
(Referred to as “level-wound coil material”), and a bending device for a thin tube called a hairpin bender is used to cut the LWC material into a predetermined length and perform bending. .

[0003] Here, regarding the above hairpin vendor,
Referring to FIG. 4, in this case, the bobbin (B) is rotatably held by a holding mechanism (a), and the end of the LWC material (P) on the bobbin (B) is fed by a feed mechanism. The LWC material (P) is fed out of the bobbin (B) by a predetermined dimension while being pulled by (b). At that time, LWC material (P) accompanying the feed
When the dancer lever (c) rotates in response to an increase in the tension of the motor and the amount of rotation reaches a predetermined value and a limit switch (not shown) is operated, an electric motor (not shown) of the holding mechanism (a) operates. Then, the bobbin (B) is rotationally driven in the direction in which the LWC material (P) is fed out (clockwise direction in the figure).

The front end portion (right end portion in the drawing) of the LWC material (P) sent out by the feed mechanism (b) in the feed direction is cut by the cutting mechanism (d) and cut from the LWC material (P). A copper tube of a predetermined length is cut off, and the copper tube is
A predetermined bending process is performed by a bending mechanism (e) which is a main body of the hairpin bender. At this time, LWC material (P)
Of the front end side of the feed mechanism (f) together with the operating parts of the feed mechanism (b) and the cutting mechanism (d) by the return mechanism (f) so as not to interfere with the operation of the bending mechanism (e). (Left direction in the figure).

[0005] When the above bending is completed, the front end portion of the LWC material (P) is moved in the feed direction by the return mechanism (f) together with the operating parts of the feed mechanism (b) and the cutting mechanism (d). With the feed mechanism (b)
The front end portion of the material (P) is sent out again toward the bending mechanism (e).

[0006]

However, in the above hairpin bender, when the front end portion of the LWC material (P) is returned by the return mechanism (f), the LWC material (P) is interposed between the LWC material (P) and the bobbin (B). Conventionally, in the case of the LWC material (P) having a loose winding, as shown by an imaginary line in FIG. 4, the LWC material (P) is unwound to the bobbin (B). This causes a problem that the unwound portion is entangled with peripheral devices such as the dancer lever (c) when the bobbin (B) rotates, causing a problem.

It should be noted that a simple cutting device which does not have a processing mechanism such as the return mechanism (f) or the bending mechanism (e) as described above and cuts by a cutting mechanism while feeding out a tube material on a bobbin. Even in the case of the above, there is a case where the above-mentioned looseness occurs in the pipe material at the time of cutting by the cutting mechanism.

The present invention has been made in view of the above points, and a main object thereof is to provide a hairpin bender for cutting and bending an LWC material which is a material of a hairpin type heat transfer tube used in an air conditioner. In a tube material cutting device and a tube material processing device equipped with such a cutting device that cuts out the tube material on the bobbin so as to prevent rewinding to the bobbin due to looseness of the tube material fed from the bobbin, Accordingly, the object of the present invention is to make it possible to smoothly perform a cutting operation or a processing operation of a pipe material.

[0009]

In order to achieve the above object, according to the present invention, when a tube material unreeled from a bobbin becomes loose, a tension is applied to the tube material to absorb the slack. With this, the rewind of the tube material to the bobbin was suppressed.

Specifically, according to the first aspect of the present invention, as shown in FIG. 1, a holding means (1) for holding a bobbin (B) around which a pipe (P) is wound so as to be able to be fed out, A feeding means (2) for feeding out the tube material (P) on the bobbin (B) held by the holding means (1) while feeding the pipe material (P), and the feeding means (2) feeds the pipe material (P) in a direction shown by a solid line arrow in FIG. A cutting device provided with cutting means (3) for cutting a pipe material of a predetermined length from the cut pipe material (P).

[0011] Then, pressing force is applied to the tube (P) so as to absorb the slack generated in the tube (P) at the time of cutting by the cutting means (3), thereby preventing rewinding to the bobbin (B). A rewind preventing means (50) is provided.

In the above construction, when the pipe material (P) on the bobbin (B) held by the holding means (1) is sent out while being fed from the bobbin (B) by the feeding means (2), the cutting means ( 3) cut by the pipe material (P)
Is cut off from the tube. At the time of cutting by the cutting means (3), the pipe material (P) fed from the bobbin (B) may become loose.

At this time, a pressing force is applied to the pipe material (P) fed from the bobbin (B) by the rewind preventing means (50) so as to absorb the looseness.
A situation in which the pipe material (P) is rewound to the bobbin (B) due to such looseness is avoided. So that

In the above construction, the pipe (P) on the bobbin (B) held by the holding means (1) is fed by the feeding means (2).
Each time it is fed out from the bobbin (B) while being sent out and cut by the cutting means (3), the front end portion of the pipe material (P) fed out from the bobbin (B) in the feed direction is returned by the returning means (5). It is returned once in the direction opposite to the feed direction of the feed means (2). Then, the portion of the pipe material (P) that has been unreeled from the bobbin (B) is loosened by the returned amount. Therefore, the operation according to the first aspect of the present invention can be performed specifically and properly.

According to a second aspect of the present invention, in the first aspect of the invention, every time the pipe member (P) is cut by the cutting means (3), the feeding direction of the pipe member (P) fed from the bobbin (B). A return means (5) for returning the front end portion in the direction opposite to the feed direction and retracting it is provided.

In the above construction, the pipe (P) fed from the bobbin (B) on the holding means (1) by the feeding means (2) is fed in the feeding direction each time it is cut by the cutting means (3). The front end portion is returned by the return means (5) in the direction opposite to the feed direction. As a result, the front end portion of the pipe material (P) in the feed direction is retracted so as not to interfere with the cutting operation by the cutting means (3), and the portion fed out from the bobbin (B) is loosened. Therefore, the unwinding-preventing action according to the first aspect of the present invention is specifically exhibited.

According to the third aspect of the present invention, the first and second aspects are provided.
In the invention of (1), as shown in FIG. 2, the unwinding preventing means (50) is provided with a pressing portion () for contacting the tube (P) fed from the bobbin (B) and pressing the tube (P). And a movable member (52) provided so that the pressing portion (53) can move forward and backward in the direction of pressing the pipe (P). 53) has a biasing mechanism that constantly biases the tube (P) in the pressing direction.

In the above arrangement, the rewind preventing means (5
The movable member (52) and the pressing portion (53) of (0) are constantly urged in the direction of pressing the pipe (P) by their own weight. Therefore, a dedicated member for configuring the biasing mechanism (for example,
Since a spring member or the like is unnecessary, the structure can be simplified by that much.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the movable member (52) is arranged in a vertical plane so as to press the pipe (P) by moving the pressing portion (53) downward. A rotating member that is rotatable, and the biasing mechanism is configured to bias the rotating member (52) and the pressing portion (53) in a direction in which the tube member (P) is pressed by its own weight. And

In the above arrangement, the rewind preventing means (5
In 0), the pressing portion (53) moves downward to press the pipe (P). At this time, the rotating member (52)
Due to the weight of the rotating member (52) and the pressing portion (53), the pressing portion (53) rotates so as to move downward and presses the pipe (P). Therefore, the operation of the urging mechanism in the third aspect of the invention is properly performed.

According to the fifth aspect of the present invention, the third and fourth aspects are provided.
In the invention of FIG. 3, as illustrated in FIG.
It is assumed that the contact surface with the pipe material (P) of 3) is formed in a smooth cross-sectional curved surface.

In the above arrangement, the rewind preventing means (5
The contact surface of the pressing portion (53) with the pipe (P) is formed in a cross-sectional curved shape, so that the pressing portion (53) is in contact with the tube (P). Feed mechanism (2)
There is no trouble in feeding the pipe (P).

According to a sixth aspect of the present invention, as a tube material processing apparatus provided with the cutting device according to the first to fifth aspects of the present invention, the cutting means (3) of the cutting device cuts off the pipe material (P) on the bobbin (B). It is assumed that a processing means (4) for performing a predetermined processing on each of the separated pipe members is provided.

In the above construction, the pipe (P) on the bobbin (B) held by the holding means (1) is fed by the feeding means (2).
When the pipe is sent out while being fed out of the bobbin (B) and cut by the cutting means (3) to a predetermined length,
The cut tube is processed by the processing means (4). And when cutting by the cutting means (3),
When the tube material (P) fed from the bobbin (B) becomes loose, the looseness is absorbed by the unwinding preventing means (50). Therefore, the occurrence of troubles around the bobbin (B) due to the looseness of the pipe material (P) can be suppressed, so that a situation in which such troubles hinder the processing operation is avoided, and the processing operation can be facilitated. Become like

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the processing means (4) comprises a bending means for bending each pipe material cut off from the pipe material (P) on the bobbin (B). It is assumed that

In the above arrangement, the pipe material (P) on the bobbin (B) held by the holding means (1) is fed by the feeding means (2) and cut by the cutting means (3). The pipe material separated from the pipe material (P) is subjected to bending by the bending means (4). Therefore, trouble on the line due to unwinding of the pipe material (P) is suppressed, which contributes to improvement in productivity in the bending process.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention, the pipe (P) is a copper LWC material (level wound coil material) for forming a hairpin type heat transfer tube used in an air conditioner. ).

In the above configuration, in the process of manufacturing the hairpin type heat transfer tube of the air conditioner, an LWC material (P) made of copper is used as the material, and the L pin material is manufactured by a hairpin bender.
The WC material (P) is cut into a predetermined dimension, and each copper pipe is subjected to a predetermined bending process. At this time, since the hairpin bender is the tube processing apparatus according to the present invention, each copper pipe material cut to a predetermined length from the LWC material (P) is subjected to bending by the bending means (4). In the process of cutting the LWC material (P) to a predetermined length and bending each copper tube material during the production of the hairpin type heat transfer tube, the LWC material (P) is entangled with peripheral equipment such as a dancer lever. Troubles on the production line that occur can be prevented beforehand.

[0029]

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

FIG. 1 schematically shows the overall configuration of a hairpin bender according to the present embodiment. This hairpin bender is attached to a bobbin (B) when a hairpin type heat transfer tube used in an air conditioner is manufactured. L which is a wrapped copper tube
It is used for cutting and bending a WC material (P) (level wound coil material) to a predetermined length.

The hairpin bender includes a holding mechanism (1) as holding means for rotatably holding the bobbin (B);
LW on bobbin (B) held by this holding mechanism (1)
By pulling the end side portion of the C material (P), the LWC material (P)
(2) as a feeding means for feeding a predetermined cutting dimension while feeding the bobbin (B) from the bobbin (B), and a front end portion in the feed direction of the LWC material (P) sent out by the feed mechanism (2) (see FIG. 1). A cutting mechanism (3) serving as a cutting means for cutting a copper pipe material of a predetermined length from the front end part by cutting the right end part), and bending each copper pipe material cut by the cutting mechanism (3). A bending mechanism (4) serving as a body of a hairpin bender, and an LWC every time a copper tube is processed by the bending mechanism (4).
A return mechanism (5) is provided as return means for returning the front end portion of the material (P) in the feed direction to a direction opposite to the feed direction (leftward in the drawing) and retracting.

As shown in FIG. 2, the holding mechanism (1) includes a flat base (11) and a base (1).
1) A column (12) standing upright and this column (1)
It has a rotating shaft (13) provided so as to protrude horizontally from 2), and an electric motor (not shown) for rotating this rotating shaft (13). Also, on the base (11), L
A dancer lever (14) is provided which operates to keep the tension of the LWC material (P) constant when the WC material (P) is sent out by the feed mechanism (2). The dancer lever (14) is arranged so as to extend along the support member (15) attached to the base (11) and along the direction in which the LWC material (P) is fed from the bobbin (B). A lever (16) pivotally supported by the support member (15). A guide portion (17) for inserting the LWC material (P) is provided at a pivotal end, which is the other end of the lever portion (16).
7) When the LWC material (P) passing therethrough is pulled by the feed mechanism (2), the lever portion (16) according to the tension is pulled.
Rotate upward. The support member (16) has a limit switch (1) for detecting when the amount of rotation of the lever (16) reaches a predetermined value.
8) is provided. And the limit switch (1
8) outputs the detection signal, the holding mechanism (1)
Assuming that the C material (P) is being fed by the feed mechanism (2), the electric motor is started to move the bobbin (B) in the direction in which the LWC material (P) is fed out (clockwise direction in FIG. 2). It is designed to rotate at a constant rotation speed.

The feed mechanism (2) is composed of an upper roller group (21) and a lower roller group (22) which are vertically opposed.
And two endless feed belts (23) and (23) wound around these roller groups (21) and (22).
And a hydraulic motor (not shown) for driving at least one of the feed belts (23). The two feed belts (23), (23) are arranged so that the outer peripheral surfaces of the belts are in contact with each other, and hold the front end side portion of the LWC material (P) from both upper and lower sides. By the operation of the electric motor, both feed belts (23), (23) feed the front end side portion of the LWC material (P) in the feed direction (right direction in FIG. 1).

The cutting mechanism (3) is disposed forward of the feed mechanism (2) in the feed direction, and has a pair of upper and lower cutting blades (3).
1) and (32), and both cutting blades (31) and (32)
And a driving means (not shown) for moving the members in directions of coming and coming from each other. The cutting mechanism (3) operates after the feeding operation of the LWC material (P) by the feeding mechanism (2) is completed, and cuts the front end side portion of the LWC material (P).

Although not shown, when the front end portion of the LWC material (P) is fed out by the feed mechanism (2), the bending mechanism (4) holds the fed copper tube material, After the front end portion of the LWC material (P) is cut by the cutting mechanism (3) and the held copper tube material is cut off, the copper tube material is bent into a predetermined shape. .

Although not shown, the return mechanism (5) has a support fixed on the fixed side and an LWC attached to the support.
It has a movable part (41) that is guided and supported movably along the feed direction of the material (P), and a driving unit that moves the movable part (41). The movable part (41) includes the roller groups (21) and (22) and the feed belts (23) and (23) of the feed mechanism (2) and the cutting blade (3) of the cutting mechanism (3).
1) and (32) are provided integrally for movement. That is, the roller groups (21) and (22) of the feed mechanism (2) and the feed belts (23) and (23) and the cutting blades (31) and (32) of the cutting mechanism (3) are unitized as one unit. And is disposed integrally with the movable portion (41) of the return mechanism (5). The feed mechanism (2) moves the movable part (41) in the returning direction after the cutting of the LWC material (P) by the cutting mechanism (3) and before the operation of the bending mechanism (4) starts. (Left direction in FIG. 1), and after the operation of the bending mechanism (4) is completed, the movable part (41) is moved in the feed direction.

In the present embodiment, a pressing force is applied to the LWC material (P) so as to absorb the looseness caused by the return by the return mechanism (5) to the bobbin (B). An anti-rewind device (50) is provided as anti-rewind means for preventing rewind.

Specifically, the rewind preventing device (50)
Is disposed forward (leftward in FIG. 2) of the LWC material (P) from the dancer lever (14) in the feeding direction of the LWC material (P), and serves as a fixing member mounted on the base (11) of the holding mechanism (1). The bracket (51) has a pressing plate (53) as a pressing portion for pressing the LWC material (P), and the pressing plate (53) is attached to the bracket (51) in the feeding direction of the LWC material (P). And a rotating member (52) as a movable member supported so as to move forward and backward.
In the present embodiment, the rotating member (52) and the pressing plate (53)
Is always biased by its own weight so as to incline toward the side of the LWC material (P) in the feeding direction.
The WC material (P) is pressed to the side in the feeding direction.

The bracket (51) is arranged so as to extend in a direction perpendicular to the direction in which the LWC material (P) is fed out, and has both ends protruding upward. A plurality of mounting holes (54), (54),... Are provided at an intermediate portion between both ends as shown in an enlarged manner in FIG. 3, and fixing screws (not shown) are respectively provided in these mounting holes (54). And screwed to the base (11). Further, support holes (55) for pivotally supporting the rotating member (52) are provided at both end portions. In FIG. 3, the anti-rewind device (50) is shown upside down from that in FIGS. 1 and 2.

The rotating member (52) includes a pair of straight members (56) formed by bending a metal plate into a U-shaped cross section.
(56), and each of the straight members (56) has an LWC
They are arranged so as to extend along the material (P) feeding direction. A pivot pin (57) is provided at an end of each straight member (56) on the bracket (51) side so as to protrude toward the side of the straight member (56). The support pin (57) is connected to the corresponding support hole (5) of the bracket (51).
5) is rotatably inserted and held. Both straight members (5
A connecting rod (58) is disposed on the pivotal end side of the bracket (51) opposite to the bracket (51) of (6), (56), and is provided with two straight members (56), (56). The rotating ends are
The connecting rods (58) are connected to rotate integrally.
A support (59) is provided at a position slightly closer to the rotation end than the connecting rod (58) in each straight member (56).

The pressing plate (53) is formed by forming one metal plate into a substantially arc-shaped cross section. This pressing plate (5
3) is arranged such that the convex surface is on the lower side at the rotation end side between the straight members (56) and (56), and the circular arc cross section is arranged in the direction along the feeding direction of the LWC material (P). A pivot pin (60) is provided at substantially the center of each of the both sides in the horizontal direction perpendicular to the feeding direction so as to project toward the corresponding linear member (56). Each of these pivot pins (60) is rotatably inserted and held in a support hole (59) of a linear member (56).

On the convex surface of the pressing plate (53),
Although illustration is omitted, a resin sheet (for example, a vinyl sheet) having low sliding resistance to the LWC material (P) is adhered, and the surface of the resin sheet causes the LWC material (P) to adhere.
Contact surface is formed. A pair of guide members (62), (62) are attached to both sides on the resin sheet. The guide member (62) is made of, for example, rubber, and is pulled while sliding on the resin sheet.
The movement of the material (P) in the left-right direction is regulated. Further, both ends of the pressing plate (53) in the direction in which the LWC material (P) is pulled are folded back to the upper surface side, respectively, and the LWC material (P) fed while sliding on the contact surface of the pressing plate (53). Is not damaged.

Here, the operation of the hairpin bender configured as described above will be described. When the feed mechanism (2) pulls the end portion of the LWC material (P) on the bobbin (B) and feeds the LWC material (P) out of the bobbin (B) by a predetermined cutting dimension, As the tension of the LWC material (P) increases, the lever portion (16) of the dancer lever (14) rotates. Set it to the limit switch (1
When 8) is detected, the electric motor of the holding mechanism (1) is activated to rotate the bobbin (B). Thereby, the feed of the LWC material (P) by the feed mechanism (2) is performed smoothly.
Next, when the cutting mechanism (3) cuts the front end portion of the LWC material (P) in the feed direction and cuts a copper pipe material of a predetermined length, the feed mechanism (2) turns the front end portion of the LWC material (P) in the feed direction. While the holding mechanism (5) is held, the return mechanism (5)
1) is moved in the return direction. Accordingly, the operation of the bending apparatus (4) for the copper pipe material is performed by the feed mechanism (2).
It is performed without any trouble without interference from the cutting mechanism (3) or the like.

At this time, the portion of the LWC material (P) fed from the bobbin (B) is loosened due to the return by the return mechanism (5).
As a result, the LWC material (P) is pressed toward the unwinding direction, and as shown by the phantom line in FIG. 1, the LWC material (P) is displaced toward the unwinding direction by an amount that is loosened. As a result, the situation where the LWC material (P) is rewound on the bobbin (B) is avoided.

Thereafter, when the bending of the copper pipe material by the bending mechanism (4) is completed, the movable part (41) of the return mechanism (5) is moved in the feed direction to return to the original position, By the mechanism (2), the front end portion in the feed direction of the LWC material (P) is fed out by a predetermined cutting dimension, and a series of operations from the next cutting to bending are performed again.

Therefore, according to the present embodiment, the LWC material (P) wound around the bobbin (B) is sent out and cut by the feed mechanism (2), and each copper pipe material cut off from the LWC material (P) is cut. In a hairpin bender in which the LWC material (P) unwound from the bobbin (B) is returned by the return mechanism (5) every time the bending is performed by the bending mechanism, the rewind preventing device (50) By LW
By constantly pressing the C material (P) toward the feeding direction,
The WC material (P) absorbs the slack that occurs with the return by the return mechanism (5), so that the LWC material (P) can be transferred to the bobbin (B) without greatly changing existing equipment. Unwinding can be prevented. Therefore, it is possible to prevent the occurrence of troubles due to the unwinding of the LWC material (P) and to facilitate the bending work when manufacturing the hairpin type heat transfer tube of the air conditioner from the LWC material (P). can do.

In the above embodiment, the rewind preventing device (5
The urging mechanism of (0) is connected to the rotating member (52) and the pressing plate (5).
Although it is configured by the weight of 3), it may be configured by a biasing member such as a spring member.

Further, in the above embodiment, the case of the hairpin bender used at the time of manufacturing the hairpin type heat transfer tube used in the air conditioner has been described.
In addition to being applicable to various processing devices for other pipe materials, it is not provided with a processing means such as a return means or a bending mechanism (5), and is a simple one that cuts the pipe material while feeding the pipe material from the bobbin. It can also be applied to a tube cutting device.

[0049]

As described above, according to the first aspect of the present invention, there is provided a cutting apparatus in which a pipe wound around a bobbin is sent out by a feeder and cut off by the cutting means. At this time, the unwinding prevention means absorbs the slack generated in the tube material fed from the bobbin and prevents the unwinding to the bobbin, thus preventing the occurrence of troubles caused by such unwinding As a result, it is possible to contribute to smoothing of the cutting operation of the pipe material.

According to the second aspect of the present invention, each time the pipe is cut by the cutting means, the pipe fed from the bobbin is returned by the return means in the direction opposite to the feed direction. The effect of the invention of Item 1 can be properly obtained.

According to the third aspect of the present invention, the unwinding preventing means includes a movable member having a pressing portion, and an urging mechanism for constantly urging the movable member in a direction in which the pressing portion presses the tube. Therefore, the effect according to the first aspect of the present invention can be specifically obtained.

According to the fourth aspect of the present invention, the movable member and the pressing portion of the unwinding preventing means are always urged in the direction of pressing the tube material by its own weight. Simplification can be achieved.

According to the fifth aspect of the present invention, the contact surface of the pressing portion with the tube is formed to have a smooth cross-sectional curved surface, so that the tube can be properly fed without hindering the feeding of the tube. Can be pressed.

According to the sixth aspect of the present invention, since the pipe processing apparatus provided with the above cutting device is provided with processing means for performing a predetermined processing on each pipe material cut by the cutting means, the pipe material is loosened. It is possible to obtain a pipe material processing apparatus in which the processing operation can be smoothly performed with less trouble caused by the above.

According to the seventh aspect of the present invention, since the bending means is used as the bending means, there is obtained a pipe processing apparatus capable of smoothly performing bending work with less trouble caused by looseness of the pipe material. be able to.

According to the eighth aspect of the present invention, the tube is made of a copper LWC material (level wound coil material) as a material of a hairpin type heat transfer tube used in an air conditioner. In the manufacturing process of the hairpin type heat transfer tube, it is possible to eliminate trouble on the line due to unwinding of the LWC material and contribute to improvement in productivity.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an overall configuration of a hairpin bender according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a holding mechanism and its peripheral devices.

FIG. 3 is an enlarged perspective view showing a rewind preventing device.

FIG. 4 is a diagram corresponding to FIG. 1, schematically showing the overall configuration of a conventional hairpin bender.

[Explanation of symbols]

 (1) Holding mechanism (holding means) (2) Feeding mechanism (feeding means) (3) Cutting mechanism (cutting means) (4) Bending mechanism (processing means) (5) Return mechanism (return means) (50) winding Return prevention device (rewind prevention means) (51) Bracket (fixed member) (52) Rotating member (movable member) (53) Press plate (press portion) (B) Bobbin (P) LWC material (tube material)

Claims (8)

[Claims] 1. A holding means (1) for holding a bobbin (B) around which a pipe material (P) is wound so as to be able to be fed out, and a pipe material on the bobbin (B) held by the holding means (1). A pipe cutting device comprising: a feeding means (2) for feeding while feeding out P); and a cutting means (3) for cutting off a pipe material of a predetermined length from the pipe material (P) fed by the feeding means (2). Then, a pressing force is applied to the pipe (P) so as to absorb the slack generated in the pipe (P) when the cutting is performed by the cutting means (3), and the winding is prevented from returning to the bobbin (B). An apparatus for cutting a pipe material, comprising a return preventing means (50). 2. The pipe cutting device according to claim 1, wherein each time the pipe (P) is cut by the cutting means (3), the front end portion in the feed direction of the pipe (P) is reversed in the feed direction. A cutting device for a pipe material, comprising: a return means (5) for returning in the direction of (1) and retracting. 3. The tube cutting device according to claim 1, wherein the unwinding-preventing means contacts the tube (P) fed from the bobbin (B) and presses the tube (P). A movable member (52) provided with a pressing portion (53) for performing the operation, the movable portion being provided so as to be able to advance and retreat in a direction in which the pressing portion (53) presses the pipe material (P); And a biasing mechanism that constantly biases the pressing portion (53) in a direction in which the pressing portion (53) presses the tubular material (P). 4. The tube cutting device according to claim 3, wherein the movable member (52) rotates in a vertical plane so as to press the tube (P) by moving the pressing portion (53) downward. A biasing mechanism comprising the rotating member (52) and the pressing portion (53);
The cutting device for a tube material is configured to urge the tube material (P) in a direction of pressing the tube material (P) by the weight of the rotating member (52) and the pressing portion (53). 5. The tube material cutting device according to claim 3, wherein a contact surface of the pressing portion (53) with the tube material (P) has a smooth cross-sectional curved surface. Cutting equipment. 6. A processing apparatus provided with the tube cutting device according to claim 1, wherein the cutting device (3) of the cutting device cuts the tube material (P) on the bobbin (B). A processing device for a pipe material, comprising a processing means (4) for processing each of the separated pipe materials. 7. The apparatus for processing a pipe material according to claim 6, wherein the processing means (4) is a bending means for performing bending processing on each pipe material cut off from the pipe material (P) on the bobbin (B). Pipe processing equipment characterized by the above-mentioned. 8. The pipe processing apparatus according to claim 7, wherein the pipe (P) is a copper level wound coil material for forming a hairpin type heat transfer tube used in an air conditioner. Tube processing equipment.