JP2001087813A - Device for supporting arm of bending roller in reinforcing bar bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for supporting the arm of the bending roller in a reinforcing bar bending machine with which the pressing force of the bending roller is equalized and also, even in the case that many bars are bent at the same time, all the reinforcing bars are bent at an accurate bend angle. SOLUTION: The center shaft 4 on the front outer peripbery of which the center roll 3 is fixed is freely slidably inserted into the inside of a rotatable cylindrical shaft 1. The arm 18A on one side of a bending roller 17 is fixed to the rotatable cylindrical shaft 1. In front of the arm 18B on the other side of the bending roller 17, a ring-shaped rotatable shaft 19 is fixed. The rotatable shaft 19 is rotatably fit into a bearing 16 which is provided on the front wall 13 of a flanged bush 11 or the frame 12 of the bending machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar bending machine for bending a bar-shaped reinforcing bar, and more particularly, to strengthening a bending roller arm for bending a reinforcing bar so as to eliminate waste of pressing force and correct all the reinforcing bars. The present invention relates to a bending roller arm support device for bending a bending angle.

[0002]

2. Description of the Related Art In a conventional apparatus, as shown in FIG. 4, a center shaft 4 'to which a center roll 3' is fixed is slidably fitted inside a rotating cylinder shaft 1 '. Axis 1 '
One of the arms 18A 'of the bending roller 17' is welded to the other arm 1 of the bending roller 17 '.
8B 'was free and not supported anywhere.

[0003]

In the above-mentioned conventional apparatus,
One arm 18A 'of the bending roller 17' is fixed to the rotary cylinder shaft 1 ', while the other arm 18B'
Is not supported anywhere, so there is no effect in the case of a single bend, but when a number of rebars are bent together, the arm 18A 'fixed to the rotating cylinder shaft 1' of the bending roller 17 '. The close part does not affect the pressing force,
Since the bending roller 17 'tends to float on the opposite side of the unsupported arm 18B' and the transmission of the pressing force is weakened, a large number of rebars cannot receive a uniform pressing force. Therefore, all the bent rebars did not have an accurate bending angle, and a slight difference occurred.

In view of the above, the present invention eliminates the waste of the pressing force of the bending roller, makes the pressing force applied to both sides of the peripheral surface of the bending roller uniform, and even in the case of a large number of bendings. It is an object of the present invention to provide an arm supporting device for a bending roller in a rebar bending machine which enables the rebar to be bent at an accurate bending angle.

[0005]

According to the present invention, there is provided an apparatus according to the present invention, wherein a center shaft having a center roll fixed to a front outer periphery is slidably fitted inside a rotating cylinder shaft. One end of the bending roller is fixed to the shaft, and the center roll protrudes from the rotating cylinder shaft during operation of the bending machine, and the end of the center shaft is fitted to the center pin of the flanged bush attached to the front wall of the bending machine frame. ,
The reinforcing bar interposed between the peripheral surface of the center roll and the peripheral surface of the bending roller is bent by the bending roller being rotated along the outer circumference of the center roll by the arm that rotates in the same direction as the rotating cylinder axis. In the bending machine, a ring-shaped rotating shaft is fixed in front of the other arm of the bending roller, and the rotating shaft is rotatably fitted to a bearing provided on the flanged bush. It is a feature.

[0006] The rotating shaft can be rotatably fitted to a bearing provided on a front wall of the bending machine frame.

According to the present invention having the above structure, one arm of the bending roller is fixed to a rotary cylinder shaft, and the other arm has a ring-shaped rotary shaft fixed in front of the arm and a flanged bush or a bending machine frame. The arms on both sides are supported because they are rotatably fitted to the bearings provided on the front wall of the bender, and the bending roller presses against the rebar when pressed, averaging the pressing force compared to supporting only one arm. There is no waste, and even if the same pressing force is applied as in the past, the pressure received is increased compared to the prior art, and only a small pressing force is required.

Further, the fact that the arms on both sides of the bending roller are supported means that even in the case of multiple bending of a reinforcing bar, a uniform pressing force is applied to the entire bending roller, and both sides of the bending roller are different from the conventional case. And the pressing force does not differ, and all the bending angles become accurate.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the apparatus of the present invention, and FIG.
FIG. 2 is a sectional view of a main part of the above. In the figure, reference numeral 1 denotes a rotating cylinder shaft, which is inserted rotatably in the front-rear direction in the bending machine frame box 2 and has a bearing 2A formed in the insertion portion. A center shaft 4 having a center roll 3 fixed forward is slidably fitted into the rotating cylinder shaft 1.

A rear portion of the center shaft 4 is connected to a cylinder 6 attached to a bracket 5 provided at a rear portion of the bending machine frame box 2, and the center shaft 4 can move forward and backward together with the center roll 3. Further, a clutch gear 7 is provided on the outer periphery of the rotating cylinder shaft 1, and the clutch gear 7 and a pinion 9 of a motor 8 provided at the rear of the bending machine frame box 2 communicate with each other via an intermediate gear 10. The rotation is transmitted to the rotating cylinder shaft 1.

Reference numeral 11 denotes a flanged bush, which is fitted and inserted into the front wall 13 of the bending machine frame 12, and has a flange fixed to the front wall 13 in a detachable manner by a fastening member. In addition, flanged bush 1
A center pin 14 is fixed to a central portion of the inside 1 by bolts 15. Reference numeral 16 denotes a bearing formed inside the flanged bush 11, and this bearing 16 is formed on a ring-shaped peripheral wall having a center pin 14 as a center and a circumferential surface 16A on the outside.

Reference numeral 17 denotes a bending roller, and an arm 18A provided on one side of the bending roller 17 is provided.
Is welded to the front surface of the flange portion 1A of the rotary cylinder shaft 1. The other arm 18B provided on the side of the bending roller 17 has a part of the outer peripheral surface of the ring-shaped rotating shaft 19 welded to the front thereof. A bush 20 is provided on the inner peripheral surface of the rotating shaft 19, and the rotating shaft 19 is rotatably fitted to a circumferential surface 16 </ b> A of the bearing 16 of the flanged bush 11. In the drawing, reference numeral 21 denotes a reinforcing bar receiving plate provided on the bending machine frame base 22, and reference numeral 23 denotes a reinforcing bar.

Next, a method of using a rebar bending machine having the device of the present invention will be described with reference to the drawings. First, the rod of the cylinder 6 is extended, the center roll 3 fixed to the center shaft 4 protrudes from the rotary cylinder shaft 1, and the front surface thereof is fitted to the center pin 14 of the flanged bush 11. Then, the reinforcing bar 23 is placed on the reinforcing bar receiving plate 21 and intervenes between the center roll 3 and the bending roller 17. At this time, the reinforcing bar 23 is in contact with the peripheral surface of the center roll 3.

Next, when the motor 8 is started, the rotation of the motor 8 is transmitted to the rotating cylinder shaft 1 via the pinion 9, the intermediate gear 10, and the clutch gear 7, and is fixed to the rotating cylinder shaft 1. One arm 18A of the bending roller 17 rotates together with the rotary cylinder shaft 1 to rotate the bending roller 17. Also, the other arm 18 of the bending roller 17
In B, the rotation shaft 19 rotates around the bearing 16 as a fulcrum. Therefore, the bending roller 17 is configured such that one arm 18A is supported by the rotary cylinder shaft 1 and the other arm 18B is
9 is supported by the bearing 16, rotates along the outer periphery of the center roll 3, and bends the reinforcing bar 23.

FIG. 3 shows an embodiment of the second aspect of the present invention, and portions corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals. FIG. 3 differs from the first embodiment in that the bearing 16 is provided inside the front wall 13 of the bending machine frame 12.

[0016]

According to the present invention, one arm of the bending roller is fixed to the rotating cylinder shaft and supported by the bearing of the bending machine frame box, and the other arm is fixed to the rotating shaft and has a flange. Since it is supported by the bush bearing or the bearing on the front wall of the bending machine frame, the support of the bending roller is strengthened compared to the conventional one where only one arm is supported, and both sides of the peripheral surface of the bending roller And the pressing force is uniform, and the pressing force is not wasted. In addition, since the pressing force of the entire bending roller is uniform, even in the case of multiple bending of the rebar, a uniform pressing force is applied to all the rebars, all of which have accurate bending angles, and a product of uniform quality can be obtained. Things.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing one embodiment of the present invention.

FIG. 3 is a sectional view of a main part showing one embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating cylinder axis 2 Bending machine frame box 3 Center roll 4 Center shaft 11 Flanged bush 12 Bending machine frame 13 Front wall 14 Center pin 16 Bearing 17 Bending roller 18A Arm 18B Arm 19 Rotation axis

Claims (2)

[Claims] 1. A center shaft having a center roll fixed to the front outer periphery is slidably fitted into a rotating cylinder shaft, and one arm of a bending roller is fixed to the rotating cylinder shaft. Sometimes the center roll protrudes from the rotating cylinder shaft, and the tip of the center shaft fits into the center pin of the flanged bush attached to the front wall of the bending machine frame,
The reinforcing bar interposed between the peripheral surface of the center roll and the peripheral surface of the bending roller is bent by the bending roller being rotated along the outer circumference of the center roll by the arm that rotates in the same direction as the rotating cylinder axis. In the bending machine, a ring-shaped rotating shaft is fixed in front of the other arm of the bending roller, and the rotating shaft is rotatably fitted to a bearing provided on the flanged bush. The arm support device of the bending roller in the rebar bending machine. 2. The arm support of a bending roller in a reinforcing bar bending machine according to claim 1, wherein the rotation shaft is rotatably fitted to a bearing provided on a front wall of the bending machine frame. apparatus.