JPH0910851A - Reinforcing bar bender - Google Patents

Abstract

PURPOSE: To simply, quickly and freely change the holding interval of reinforcing bar between a bending roller and support column without preparing plural bending rollers, further to smoothly bend a specially shaped bar. CONSTITUTION: A bender is provided with a reinforcing bar support column 20 to form the bending center of reinforcing bar to be worked, a bending roller 45 to press a reinforcing bar to the support column 20, a moving shaft 44 to support the bending roller 45, a turning member 43 (rotating table) to turn the moving shaft 44 along bending route, a drive motor to turn the turning member 43 through a transfer mechanism and a reinforcing bar support member 47 to bear the reaction of bending force imparted to a reinforcing bar. In this reinforcing bar bender 40, the bending roller 45, in which a rotating ring 49 interposing a bearing on its outer periphery is mounted, further, in which one or more inserting holes 44' at least, having with the ruggedness at the same pitch as ruggedness at a prescribed pitch formed to the moving shaft 44, are formed on the inner side. The bending roller 45 is fitting supported in rotation locked state to the moving shaft 44 attachable/detachable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar bender for bending round steel rods such as reinforcing bars for reinforced concrete and deformed reinforcing bars (hereinafter referred to as reinforcing bars).

[0002]

2. Description of the Related Art Conventionally, as a reinforcing bar bender for bending a reinforcing bar used at a construction site at an arbitrary radius to a desired angle, various portable reinforcing bar benders for carrying the work to a construction site are known.

Such a portable rebar bender is generally provided with a foldable handle on the side surface of a substantially cubic machine frame so that it can be carried. An arcuate curved groove is formed in a top plate provided on the upper surface of the machine frame, and a moving shaft is provided so as to project upward through the curved groove. The moving shaft rotatably supports the center of the bending roller. Further, at the center position of the arc forming the curved groove,
A post is attached that receives the rebar to be processed. Further, a reinforcing bar supporting member that bears a reaction force against the bending force applied to the reinforcing bar is fixed to the top plate so as to be movable and adjustable.

In such a reinforcing bar bender, the base portion of the reinforcing bar P is filled between the support column and the reinforcing bar supporting member, and the bent portion is filled between the support column and the bending roller. Then, the drive motor provided in the machine frame is driven to rotate the moving shaft supported below the bending roller via the transmission mechanism, and further, the rotating member attached to the moving shaft. Then, the moving shaft erected on the rotating member pivotally moves along the curved groove up to a predetermined angle around the column, and the bending roller supported by the moving shaft presses the reinforcing bar and moves along the curved groove. Move forward to a specified angle. As a result, bending force about the fixed roller acts on the reinforcing bar, and the reinforcing bar is bent at a predetermined angle about the fixed roller.

In this type of reinforcing bar bender, the reinforcing bar sandwiching distance between the support and the reinforcing bar supporting member and the reinforcing bar sandwiching interval between the bending roller and the support are appropriately adjusted according to the diameter dimension (thickness) of the reinforcing bar. Must. Adjustment of the reinforcing bar holding distance between the column and the reinforcing bar supporting member is performed by loosening, for example, a fastening bolt fixing the reinforcing bar supporting member and moving the reinforcing bar supporting member. In addition, in order to adjust the rebar sandwiching distance between the bending roller and the support, prepare multiple bending rollers with different radii, and replace them with the ones that match the diameter size (thickness) of the reinforcing bar on the moving shaft. (For example, JP-A-6-041920 and JP-A-6-0.
47447, etc.).

[0006]

However, the above-mentioned reinforcing bar bender still has the following problems. That is, it is troublesome and labor-intensive to replace the rotating roller each time according to the diameter dimension (thickness) of the reinforcing bar in this way, and the work efficiency is poor. It is necessary to manage a plurality of bending rollers having different radii. There were problems such as being complicated, being inconvenient to carry, and being worried about losing.

Further, when the deformed bar is bent by the reinforcing bar bender designed as described above, it is difficult for the small-diameter bending roller to smoothly rotate, and the friction coefficient generated at the contact portion between the bending roller and the deformed bar is large. Excessive bending may cause excessive deformation of the deformed bar, causing damage to the bar, excessive load on the drive motor, and abnormal wear of the rollers. It was

Furthermore, there is a problem that the degree of freedom with respect to the diameter dimension (thickness) of the reinforcing bar and the bending angle is low.

The present invention was devised in view of such circumstances, and the problem to be solved is to solve the above problems and problems of the conventional reinforcing bar bender. The point is that, without the need to prepare a plurality of bending rollers, the reinforcing bar sandwiching distance between the bending rollers and the columns can be changed easily, quickly and freely, and moreover, a reinforcing bar bender that can achieve smooth bending of deformed reinforcing bars. Is to provide.

[0010]

Means for Solving the Problem The means adopted by the present invention in order to solve the problem is that the invention according to claim 1 is "a pillar 16 forming a bending center of a reinforcing bar P to be machined, Bending roller 15 for pressing the reinforcing bar P against the pillar 16.
A moving shaft 14 that supports the bending roller 15, and a moving shaft 14 that supports the moving shaft 14 and that has a predetermined bending path 13
And a drive motor for rotating the rotating member via a transmission mechanism, and a reinforcing bar supporting member for bearing a reaction force of the bending force applied to the reinforcing bar. In the reinforcing bar bender, the bending roller 15 is provided with a rotating ring 19 with a bearing interposed on the outer periphery thereof, and at least an unevenness is formed on the inner surface at the same pitch as the unevenness formed on the moving shaft 14 at a predetermined pitch. One or more eccentric insertion holes 14 'are formed, and the bending roller 15 is detachably fitted and supported on the moving shaft 14 in a revolving state. " 1
0 is the gist.

Unless otherwise specified, the above-mentioned support column is
It is defined as a member that bears the reaction force of the bending force applied to the reinforcing bar that is pressed and bent by the bending roller that swivels, and a cylindrical reinforcing bar that has a curved surface portion for winding and bending along the outer edge of the reinforcing bar. It also includes a support column and a fixed roller in which, for example, a rotating roller is attached to the reinforcing rod support column through a bearing.

[0012] Next, the invention of claim 2 is, "A rebar in which the pillar is detachably locked and fixed on the top plate, and a reinforcing bar which is integrally formed near the center of the base and has a rectangular longitudinal section. A support part, which is in contact with the rebar to be processed, is formed in an arc shape having a diameter dimension of 0.6 to 2.0 times the diameter dimension (thickness) of the rebar, and extends from the tip. The side wall of the bent side wall which is in contact with the bending tip of the bending rebar is formed in an inclined shape narrower in width than the tip end. " is there.

Next, in the invention of claim 3, "the rotating member is a gear that supports the bending roller, and the gear meshes with the gear of the speed reducing means that constitutes the transmission mechanism". The gist of the reinforcing bar bender according to any one of claims 1 and 2 having the characteristics.

Next, the invention of claim 4 is characterized in that "a control device for setting the bending angle of the reinforcing bar is provided", and the reinforcing bar bender according to any one of claims 1 to 3. Is the gist.

[0015]

According to the reinforcing bar bender 10 of the present invention thus constructed, the bending roller 15 is formed with the insertion hole 14 'eccentrically and is inserted into the moving shaft 14 in any desired direction of 360 degrees. Therefore, the moving shaft 14 (insertion hole 1
It is possible to freely change the distance from the center of 4 ') to the peripheral edge thereof, and the rebar sandwiching distance between the bending roller 15 and the support 16 can be freely adjusted by one bending roller 16. It becomes possible. That is, while ensuring a sufficient insertion space between the bending roller 15 and the support column 16,
The outer diameter of the bending roller 15 can be set to be considerably large, and it is not necessary to prepare a plurality of bending rollers having different radii, or to replace and attach a roller having a diameter size (thickness) of the reinforcing bar to the roller shaft. Furthermore, convenience such as carrying and management and work efficiency can be improved.

A rotating ring 19 is attached to the outer circumference of the bending roller 15 with a bearing interposed, and the rotating ring 19 can rotate smoothly. Therefore, for example, when a deformed bar is bent. However, it is possible to reduce the friction coefficient generated at the contact portion between the bending roller 15 and the deformed rebar, prevent excessive deformation of the deformed rebar due to excessive internal stress, and even deformed rebar Smooth bending can be achieved, work efficiency can be improved, and the overall shape of the reinforcing bar bender can be reduced.

Next, according to the reinforcing bar bender of claim 2, there is provided a reinforcing bar supporting portion which is integrally formed near the center of the base part and has a rectangular longitudinal section, and which has a rectangular cross section. The tip end of the reinforcing bar supporting portion which is in contact is formed in an arc shape having a diameter dimension of 0.5 to 2.0 times the diameter dimension (thickness) of the reinforcing bar P, and the entire shape is formed in a substantially plate shape. Therefore, unlike a reinforcing bar supporting column attached to a conventional reinforcing bar bending machine or, for example, a fixed roller that is axially supported, the reinforcing bar supporting section is caused to bear a sufficient reaction force against the bending force applied,
It is possible to bend the reinforcing bar P sharply.

Of the side walls extending from the arcuate tip, at least the side wall with which the bending tip Q of the bending rebar abuts is formed in an inclined shape narrower than the tip. Even if the bending bar has a restoring force,
It becomes possible to cover this sufficiently. That is,
According to this configuration, the reinforcing bar P is provided with a diameter dimension (thickness) of the reinforcing bar P.
It is possible to surely perform a bending process in an antiparallel 180-degree hairpin shape spaced apart by 0.5 to 2.0 times, and 0.5 to 2.0 of the diameter dimension (thickness) of the reinforcing bar P. Bending can be performed with double the diameter.

Next, according to the reinforcing bar bender of claim 3, the rotating member is a gear for supporting the bending roller, and the gear meshes with the gear of the speed reducing means constituting the transmission mechanism. Therefore, the drive motor can be downsized and the power consumption can be reduced, and the overall shape can be downsized.

Next, according to the reinforcing bar bender of claim 4, for example, a control device which is operated by a sensor is connected to the drive motor, and an operation signal is sent to the drive motor based on an output signal from the sensor, and the drive motor is driven. Since the configuration is such that the bending roller is stopped and the turning angle of the bending roller is controlled, the bending angle of the reinforcing bar can be set easily and easily, and malfunctions can be prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a reinforcing bar bender according to the present invention will be described in detail below with reference to the accompanying drawings.
The present invention is not limited by the following examples unless the gist is exceeded.

The reinforcing bar bender 10 according to the first embodiment has a reinforcing bar to be machined at a predetermined position on a top plate 12 of a machine frame 11 formed into a substantially box shape as a whole, as shown in a partial external perspective view in FIG. Post (fixed roller) 16 that forms the bending center of P
And a reinforcing bar supporting member 17 that bears a reaction force against the bending force applied to the reinforcing bar P are fixedly arranged. Also, machine frame 1
A drive motor (not shown) for rotating the moving shaft 14 along the curved groove 13 and a transmission means (not shown) for transmitting the driving force are provided in the drive shaft 1. An operation unit (not shown) for controlling the operation of the motor and the transmission means is provided. In addition, this rebar bender has a foldable handle on the side of a substantially cubic machine frame so that it can be carried.

The operation section includes a start switch for connecting the main power source, a pilot lamp for displaying the start state, a start switch for starting the drive motor, and an emergency stop button for emergency stop. The operating part is also the bending roller 1
A bending angle adjusting device for restricting the movement of No. 5 and adjusting the bending angle of the reinforcing bar P may be provided.

A curved groove 13 extending in a substantially semi-circular shape with a predetermined radius of curvature is formed on the top plate 12, and a bending roller 15 is fitted and supported by a moving shaft 14 which extends through the curved groove 13 and extends upward. A bending load is applied to the reinforcing bar P by a bending roller 15 that moves along the groove 13. The lower end of the moving shaft 14 is fixed to a swing arm or an alternative thereof.

At the center position of the arc forming the curved groove 13, a support (fixed roller) 16 for receiving the reinforcing bar P to be processed is arranged and fixed. Furthermore, on the top plate 12,
A reinforcing bar support member 17 that bears a reaction force that resists the bending force applied to the reinforcing bar P is fixed by a fastening bolt 18 so as to be movable and adjustable.

The bending roller 15 has an eccentric insertion hole 14 'for accommodating an insertion portion formed at the upper end of the moving shaft 14. The inner surface of the insertion hole 14 ′ is provided with irregularities at the same pitch as the irregularities of a predetermined pitch formed on the insertion portion of the moving shaft 14, and the moving shaft 14 has an angle of 360 degrees. The insertion hole 14 'directed in a desired arbitrary direction is fitted and supported in a non-rotatably fixed revolving state.

When changing the reinforcing bar holding distance between the bending roller 15 and the fixed roller 16 in accordance with the diameter (thickness) of the reinforcing bar to be processed, first, the bending roller 15 is pulled upward from the moving shaft 14. After being pulled out, it is rotated in an arbitrary direction of 360 degrees to perform position adjustment again, and then inserted into the moving shaft 14, whereby position adjustment can be performed.

The bending roller 15 can be prevented from coming off by tightening a washer that straddles both the bending roller 15 and the moving shaft 14 with a bolt. by this,
It is possible to surely adjust and fix the reinforcing bar holding interval between the bending roller 15 and the support (fixed roller) 16 according to the diameter dimension of the reinforcing bar.

A rotating ring 19 is attached to the outer circumference of the bending roller 15 with a bearing interposed therebetween, so that the rotating ring 19 can rotate smoothly. This is because the bending roller 15 is non-rotatably fixed to the moving shaft 14, and the reinforcing bar P is held between the bending roller 15 and the support (fixed roller) 16 in the curved groove 13 on the arc. Since it is rotated along the bending direction, the coefficient of friction generated at the contact portion between the bending roller 15 and the reinforcing bar P during bending of the reinforcing bar P is further reduced so that the bending roller 15 smoothly rotates. Because it is necessary to leave.
Therefore, with such a configuration, even if the reinforcing bar P is a deformed bar, it is possible to prevent the deformed bar from being broken due to excessive internal stress. Even with deformed rebar, smooth bending can be easily achieved, and work efficiency can be improved.

In this embodiment, a known so-called deep groove ball bearing using a bearing is attached, but other bearings such as a radial ball bearing, a snast ball bearing or a so-called roller bearing are interposed. The rotating ring may be attached.

Further, the insertion holes 14 'for accommodating the insertion portions formed at the upper end portion of the moving shaft 14 may be formed at two eccentric positions which are different in distance from the center of the bending roller 15. it can. Concavities and convexities are formed on the inner surface of each of the insertion holes 14 ′ at the same pitch as the irregularities of the predetermined pitch formed on the insertion portion of the moving shaft 14, and the moving shaft 14 has a desired 360 ° pitch. The bending roller 1 is configured so that the insertion hole 14 'directed in an arbitrary direction is fixed in a non-rotatable manner so as to be fitted and supported.
It is possible to more precisely adjust and fix the rebar sandwiching distance between the No. 5 and the fixed roller 16 according to the diameter of the rebar.

Next, in the case of changing the rebar clamping distance between the support (fixed roller) 16 and the rebar support member 17 in accordance with the diameter (thickness) of the rebar to be processed, first of all, as in the conventional case. After moving the reinforcing bar support member 17 in the direction orthogonal to the reinforcing bar P in a state where the fastening bolts 18 fixing the reinforcing bar supporting member 17 are loosened to match the diameter dimension (thickness) of the reinforcing bar p,
Tighten the fastening bolts 18 to fix. This makes it possible to adjust the reinforcing bar sandwiching distance between the support (fixed roller) 16 and the reinforcing bar support member 17 in accordance with the diameter of the reinforcing bar.

Next, in the reinforcing bar bender of the second embodiment shown in FIG. 2, a fitting hole is formed in the top plate 22, and a reinforcing bar supporting pillar 30 is detachably fitted in the fitting hole in place of the pillar 16. It is substantially the same as Example 1 except that it is supported.

The reinforcing bar supporting column 30 will be described in more detail. The reinforcing bar supporting column 3 is manufactured by cutting a thick iron plate into a predetermined shape and then quenching it. As shown in FIG. A base portion 31 formed in a shape that fits into a fitting hole formed on the top surface of the top plate 22, and a reinforcing bar support portion 32 having a height of 3 cm and a length of 5 cm, which is provided at the center of the top surface of the base portion 31. Of the tips of the reinforcing bar support portion 32, the tip 33 against which the reinforcing bar P to be worked contacts is formed in an arc shape having a diameter dimension of 11 mm, which is slightly larger than the diameter dimension (thickness, 10 mm) of the reinforcing bar P. The side walls 34a, 34b extending from the tip 33 and having a length of 5 cm are formed in a tapered shape narrower than the arcuate tip 33 (the other end 35 is about 0.85 mm). The vertical cross section is rectangular

In the side walls 34a and 34b, at least the side surface 34b with which the bending tip of the bending rebar abuts may be formed in an inclined shape narrower than the arcuate tip.

Six through holes 36 are formed in the edge of the base 31, and male threads 37 of the fastening bolts provided through the through holes 36 are provided in the fitting holes. The reinforcing bar support portion 32 is erected and fixed on the top plate 22 by screwing.

The size of the reinforcing bar supporting portion 32 can be appropriately changed as long as it can bear the reaction force against the bending force applied to the reinforcing bar P. That is, the diameter of the arcuate tip 33 is uniquely determined by the diameter and the curvature of the reinforcing bar P to be bent, and is 0.5 of the diameter of the reinforcing bar P.
.About.2.0 times the diameter, and for example, when the diameter of the reinforcing bar is 10 mm, the length of the reinforcing bar supporting portion can be appropriately changed in design, but is preferably 15 to 50 mm. Further, the height of the reinforcing bar supporting portion is preferably less than 50 mm.

Conventionally, the reinforcing bars are sized in diameter (thickness, 8 to 16 m).
m) When bent into parallel hairpin shapes that are separated from each other,
For example, in the case of a fixed roller that receives a reinforcing bar (10 mm) to be processed or a conventional columnar shape in which the diameter of the pillar is smaller than 20 mm, it is possible to bear the reaction force against the bending force applied to the fixed roller or the pillar. Therefore, the reinforcing bars could not be bent into parallel hairpin shapes with the diameter dimension (thickness) separated from each other.

However, since the reinforcing bar supporting portion 32 of the reinforcing bar supporting column 30 can sufficiently bear the reaction force against the bending force applied thereto, unlike the conventional reinforcing bar bender, the reinforcing bar of the round bar is used. Even if you sharply bend or deformed rebar, etc., the rebar support pillar does not easily bend,
Further, among the side walls of the reinforcing bar supporting column, at least the side wall with which the bending tip of the reinforcing bar comes into contact is formed in an inclined shape with a width narrower than the arcuate tip, and even if a restoring force acts on the reinforcing bar after bending, it is sufficient. To be able to cover this,
It is possible to easily, surely, and quickly bend the rebar into an antiparallel hairpin shape with a distance of 0.5 to 2.0 times the diameter (thickness) of the rebar.

As shown in FIG. 4, in the reinforcing bar bender 40 of Example 3, a vertical center axis (not shown) is arranged and fixed at the center of a top plate of a machine frame 41 formed in a substantially box shape as a whole. A rotary table 43 is rotatably fitted to and supported by a shaft, and a screw hole is provided in an upper portion of the central shaft, and a reinforcing bar supporting column 20 for forming a bending center of a reinforcing bar P to be bent is provided. The reinforcing bar support portion is erected and fixed by threadably supporting male threads of a fastening bolt through six through holes formed in the edge portion of the base portion.

A moving shaft 44 is provided upright in the vicinity of the periphery of the rotary table 43, and is formed on the moving shaft 44 at a position eccentric from the center, and on the inner surface of the moving shaft 44, a predetermined shape is formed. The bending roller 45 having the insertion holes 44 ′ in which the unevenness is formed at the same pitch as the unevenness of the pitch is
It is configured to be detachably mounted and fixed in a revolving state in a desired direction of 60 degrees.

On the other hand, a drive gear is connected to the drive shaft of the drive motor, and the rotary table 43 is rotated by meshing with a driven gear attached to the lower surface of the rotary table 42. An angle setting handle (not shown) is provided on the front surface of the machine frame 41, and the rotary table 43 is rotated by an angle determined by adjusting the handle.

An arcuate engagement protrusion is formed on the outer peripheral portion of the lower surface of the rotary table 43, and a driven gear that meshes with the drive gear is provided inside the engagement protrusion to rotate the rotary table 43. You may allow it.

Except for the above points, the other structure is substantially the same as that of the second embodiment, and since it has substantially the same operation and effect as the reinforcing bar bender 20 of the second embodiment, it will be repeatedly described. Absent.

Next, FIG. 5 is a vertical sectional view of the reinforcing bar bender 50 of the fourth embodiment. As shown in FIG. 5, the output shaft 52 of the drive motor extends into the machine frame, and the drive gear formed at the tip of the rotary shaft meshes with the driven gear 53. The driven gear 53 is the vertical first shaft 5 rotatably supported by the machine frame.
4 is fixed. The pinion gear 55 is the driven gear 53.
The pinion gear 55 is meshed with the large gear 56. The large gear 56 is rotatably supported by a second shaft 57 that is rotatably supported by the machine frame, and is selectively connected to the second shaft 57 by an electromagnetic clutch 58.

The output gear 59 formed at the upper end of the second shaft 57 meshes with the intermediate gear 60. Intermediate gear 60
Is fixed to the upper portion of a vertical third shaft 61 rotatably supported by the machine frame. The pinion gear 62 is the third shaft 61.
It is fixed to the upper part of the above and meshes with the roller drive gear 63. A spiral spring 64 is arranged around the third shaft 61. The inner end portion of the spiral spring 64 is fixed to the third shaft 61 by a screw or a bolt (not shown), and the outer end portion is fixed to a side wall of the machine frame by a screw (not shown). Spiral spring 64
Urges the third shaft 61 to hold the bending roller 66 in the initial position.

The roller drive gear 63 is fixed to a vertical fourth shaft 67 rotatably supported by the machine frame. A sprocket 68 is rotatably supported on the lower end portion of the fourth shaft 67, and the sprocket 68 includes a support arm 69 extending laterally. The sprocket 68 is paired with an operating sprocket (not shown) rotated by an adjustment dial, and a roller chain 71 is wound around the sprocket 68 and the operating sprocket. A limit switch 72 is attached to the tip of the support arm 69, and the limit switch 72 is used for the roller drive gear 6
3 is provided with a contact 72a capable of contacting the raised portion 63a.

The fourth shaft 67 penetrates the top plate and extends upward, and the reinforcing bar support column 30 is attached to the upper end of the fourth shaft 67. In the reinforcing bar support column 30, the fastening bolt 73 is provided with the fourth shaft 67 through the six through holes formed in the edge portion of the base portion.
Is fastened to the center of the upper end of the shaft and is carried by the fourth shaft 67.

A moving shaft 75 is fixed to a peripheral area of the roller driving gear 63 located on the opposite side of the limit switch 72. The moving shaft 75 extends upward from the roller driving gear 63 and penetrates the curved groove. . The upper end of the moving shaft 75 is formed with irregularities having a predetermined pitch.

The moving shaft 75 is formed at a position eccentric from the central axis, and has an insertion hole 76 formed on the inner surface thereof with unevenness formed at the same pitch as the unevenness of the predetermined pitch formed on the moving shaft 75. The bending roller 66 is non-rotatably fitted and supported. In addition, on the outer periphery of the bending roller 66,
A rotating ring is attached with a bearing interposed.

[0051]

According to the reinforcing bar bender according to the present invention described above, the insertion hole formed eccentrically on the bending roller and directed in any desired direction of 360 degrees is detachably fitted and supported on the moving shaft. Therefore, the amount of eccentricity can be freely adjusted, and the distance from the center of the bending roller (the center of the insertion hole) to the outer periphery thereof can be freely changed. It can correspond to the diameter of the reinforcing bar. That is, it is not necessary to prepare a plurality of bending rollers having different radii, or to replace a roller that matches the diameter dimension (thickness) of the reinforcing bar on the roller shaft each time, and it is possible to bend at any desired angle. You can respond quickly.

Particularly, in a bending roller having a plurality of the eccentric insertion holes having different distances from the central axis of the moving shaft, the center of the bending roller (the center of the insertion hole).
It is possible to freely change the distance from the to the peripheral edge with high precision, and it is possible to accurately adjust the rebar clamping distance between the bending roller and the fixed roller (or the reinforcing bar supporting column) even with one bending roller. It will be possible.

Further, in the reinforcing bar bender according to the present invention, since the reinforcing bar bender itself can be miniaturized, bending of the reinforcing bar can be performed at the work site, and management of the bending roller is easy. Furthermore, when carrying the reinforcing bar bender, the bending roller is not lost, and it is never forgotten to bring it back to the construction site to return to it, so that the work efficiency can be improved.

Next, since a rotating ring is attached to the outer periphery of the bending roller with a bearing interposed, the rotating ring smoothly rotates even when the deformed bar is bent, for example. It is possible to reduce the friction coefficient generated in the contact portion between the deformed bar and the deformed bar. Therefore,
It is possible to prevent an excessive internal stress from being generated in the deformed rebar as in the related art, which may damage the rebar, an excessive load on the drive motor, and abnormal wear of each roller. That is, even a deformed reinforcing bar can be bent easily, quickly and surely at any desired angle.

Next, according to the reinforcing bar bender of the second aspect, in addition to the above-mentioned effects, in particular, the reinforcing bar supporting portion pivotally supports a thick reinforcing bar supporting column or a fixed roller attached to a conventional reinforcing bar bender. Unlike the shaft center, the longitudinal section is formed into a plate with a long quadrangular shape so that it can fully bear the reaction force against the bending force applied to the reinforcing bar. Even if the reinforcing bar or deformed bar of the bar is sharply bent, the reinforcing bar supporting portion does not easily bend.

Further, the tip of the reinforcing bar supporting portion which is in contact with the reinforcing bar to be processed is formed into an arc shape having a diameter dimension of 0.5 to 2.0 times the diameter dimension (thickness) of the reinforcing bar, and moreover, the arc shape. Of the side walls extended from the tip formed in, the side wall which is in contact with the bending tip of the bending rebar is formed in an inclined shape narrower than the tip formed in the arc shape. Even if the restoring force works, it should be covered enough to be easily and surely and quickly bent into parallel hairpin shapes separated by 0.5 to 2.0 times the diameter (thickness) of the reinforcing bar. You can

Further, when the reinforcing bar bender of claim 2 is used and the reinforcing bar whose upper end is sharply bent is used as a working bar when assembling a cloth foundation or a solid foundation for construction, for example, the main bar is easily provided at the upper end. It can be locked securely and quickly, and can be embedded in a concrete foundation with a narrow width, such as a cloth foundation for a bath. It is possible to prevent work-related accidents in which the upper end of the worker's work muscle is stabbed and injured.

Furthermore, a sharply bent rebar, which could only be conventionally manufactured by hand, can be simply and quickly prepared, and the rebar after bending is
In the field of construction and civil engineering and construction, etc., if the reinforcing bar whose upper end is sharply bent is used as a pillar, it is possible to insert the upper end of a steel plate into the bent part and hang it vertically. It will be useful that can be used for.

Next, in addition to the above-mentioned effects, the reinforcing bar bender of claim 3 is, in particular, a gear for supporting the bending roller by the rotating member, and the gear is a speed reducing means constituting the transmission mechanism. Since it meshes with the gear, the drive motor can be downsized and the power consumption can be reduced, and the overall shape can be downsized.

Next, in the reinforcing bar bender of claim 4, in addition to the operational effects of the reinforcing bar bender of any of claims 1 to 3, in particular, for example, a drive motor is connected to a control device operated by a sensor, An operation signal can be sent to the drive motor based on the output signal from the sensor, the drive motor can be stopped, and the turning angle of the bending roller can be controlled. Therefore, the bending angle of the reinforcing bar can be set easily and easily. It can be performed, and it is possible to reliably prevent malfunctions and the like. Even deformed reinforcing bars can be bent easily, quickly, and surely at any desired angle.

[Brief description of the drawings]

FIG. 1 is a partial external perspective view showing a reinforcing bar bender according to an embodiment of the present invention.

FIG. 2 is a partial external perspective view showing a reinforcing bar bender according to another embodiment of the present invention.

FIG. 3 is a perspective view of a reinforcing bar support column provided in the reinforcing bar bender shown in FIG.

FIG. 4 is a partial external perspective view showing a reinforcing bar bender according to another embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a reinforcing bar bender according to another embodiment of the present invention.

[Explanation of symbols]

 10 ... Reinforcing bar bender 11 ... Machine frame 12 ... Top plate 13 ... Bending part 14 ... Moving shaft 14 '... Insertion hole 15 ... Bending roller 16 ... Strut (fixed roller) 17 ... Reinforcing bar support member 18 ... Fastening bolt 19 ... Rotating ring 20 ... Reinforcing bar bender 21 ... Machine frame 22 ... Top plate 23 ... Rotating table 24 ... Moving shaft 24 '... Insertion hole 25 ... Bending roller 27 ... Reinforcing bar supporting member 28 ... Fastening bolt 29 ... Rotating ring 30 ... Reinforcing bar supporting column 31 ... Base 32 ... Reinforcing bar support 33 ... Tip 34a ... Side wall 34b ... Side wall 35 ... Other end 36 ... Through hole 37 ... Male screw 40 ... Reinforcing bar bender 41 ... Machine frame 42 ... Top plate 43 ... Rotation table 44 ... Move Shaft 44 '... Insertion hole 45 ... Bending roller 47 ... Reinforcing bar support member 48 ... Fastening bolt 49 ... Rotating ring 50 ... Reinforcing bar bender 52 ... Output shaft 53 ... Followed gear 54 ... First shaft 55 ... Nion gear 56 ... Large gear 57 ... Second shaft 58 ... Electromagnetic clutch 59 ... Output gear 60 ... Intermediate gear 61 ... Third shaft 62 ... Pinion gear 63 ... Roller drive gear 63a ... Raised portion 64 ... Swirl spring 66 ... Bending roller 67 ... 4 shafts 68 ... sprocket 69 ... support arm 71 ... roller chain 72 ... limit switch 72a ... contactor 73 ... fastening bolt 75 ... moving shaft 76 ... insertion hole P ... rebar to be bent

Claims (4)

[Claims] 1. A pillar that forms a bending center of a reinforcing bar to be machined, a bending roller that presses the reinforcing bar against the pillar, a moving shaft that supports the bending roller, and a supporting shaft that supports the moving shaft. A rotating member that rotates the moving shaft along a predetermined curved path, a drive motor that rotates the rotating member via a transmission mechanism, and a reinforcing bar that bears a reaction force of the bending force applied to the reinforcing bar. In a reinforcing bar bender provided with a support member, the bending roller has a rotating ring with a bearing interposed on the outer periphery thereof, and the inner surface has unevenness at the same pitch as the unevenness of a predetermined pitch formed on the moving shaft. At least one or more eccentric insertion holes that are formed are formed, and the bending roller is detachably fitted and supported around the moving shaft in a revolving state. 2. The supporting column comprises a base portion which is detachably locked and fixed on a top plate, and a reinforcing bar supporting portion which is integrally formed near the center of the base portion and has a rectangular longitudinal section. The bending end of the bending rebar is formed by forming the arc-shaped end having a diameter of 0.6 to 2.0 times the diameter (thickness) of the rebar into contact with the power rebar. The reinforcing bar bender according to claim 1, wherein the side wall with which the tip is in contact is formed in an inclined shape that is narrower than the tip. 3. The rotating member is a gear that supports the bending roller, and the gear meshes with a gear of a speed reduction means that constitutes the transmission mechanism. Reinforcing bar bender described in crab. 4. The reinforcing bar bender according to claim 1, further comprising a control device for setting a bending angle of the reinforcing bar.