JP2005186139A - Reinforcing bar bender - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing bar bender with which a mesh reinforcing bar is bendable to nearly 180° between side rollers and the mesh reinforcing bar is upward easily removed away from between the side rollers after completing bending. <P>SOLUTION: In the reinforcing bar bender in which the side rollers 11 are arranged on both sides of a slide plate 6 which is vertically moved, fulcrum blocks 8 are downward spaced at prescribed intervals in the longitudinal direction in the upper part of the slide plate and also a reinforcing bar 7 is pressed against, pulled in between the side rollers and bent, holders 12 for supporting the side rollers are turnably provided in this reinforcing bar bender. Projecting parts 30 are provided on both side faces of the slide plate and the interlocking mechanisms which are engaged with these projecting parts when the slide plate is lowered by a prescribed distance and by which the holders are rotated on the side of the slide plate with the descent of the slide plate are arranged on both sides of the slide plate and the reinforcing bar on the way of bending is further bent by being pressed from both sides with the side rollers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reinforcing bar bending machine that bends mesh reinforcing bars integrally.

  Conventionally, as shown in FIG. 6, side rollers 11 are disposed on both sides of the slide plate 6 that moves up and down in parallel with the slide plate 6, and the fulcrum blocks 8 are downwardly spaced in the upper longitudinal direction of the slide plate 6. In the retractable rebar bending machine in which the rebar 7 is pressed between the side rollers 11 and bent when the slide plate 6 is lowered at the fulcrum block 8, Since the holder 12 that rotatably supports the side rollers 11 provided at intervals is fixed to the partition plate 3 of the machine frame, there is no problem when the slide plate 6 is lowered and the rebar 7 is bent at 90 °. However, when the slide plate 6 is further lowered and the rebar 7 is bent at 180 °, the bent rebar 7 is detached from between the side rollers 11. Therefore, the rebar 7 exerts a repulsive force in the direction opposite to the bending direction, and it is difficult to detach from the side rollers 11 upward.

Further, when the slide plate 6 is lowered and bending is performed at the fulcrum block 8, a large driving force is required, and a large driving force is also required when the slide plate 6 is detached from between the side rollers 11, and 180 It was extremely difficult to bend, and no measures have been taken in the past to solve this problem.
This retractable rebar bending machine is disclosed in Japanese Utility Model Publication No. Sho 63-56937, but this is not intended to solve the above problems.
Japanese Utility Model Sho 63-56937

  In view of the above, the present invention can easily bend the mesh rebar between the side rollers to about 180 °, and can easily remove the mesh rebar upward from between the side rollers after the end of bending. It is intended to provide a bending machine.

  In order to solve the above-mentioned problem, the rebar bending machine according to the first aspect of the present invention is provided with side rollers on both sides of the slide plate that is moved up and down by the drive device in parallel with the slide plate, and in the upper longitudinal direction of the slide plate. In the rebar bending machine in which the fulcrum block is provided downward at a predetermined interval, and the rebar is pressed and pulled by the fulcrum block when the slide plate is lowered, the side roller is provided on the machine frame side. The supporting holder is provided so as to be able to turn to the slide plate side, and protrusions are provided on both sides of the slide plate. When the slide plate is lowered by a predetermined distance, the slide plate is engaged with the protrusion, and the slide plate is lowered. In addition, an interlocking mechanism that rotates the holder toward the slide plate is arranged on both sides of the slide plate. It is, is characterized in that the bending pressed from both sides by the side rollers rebar middle bent by the rotation of the holder with the fulcrum block.

  With such a configuration, when the slide plate descends, the fulcrum block starts to press and bend the rebar between the side rollers, and when the slide plate descends a predetermined distance, an interlocking mechanism is attached to the protrusion of the slide plate. When the slide plate descends, the holder that supports the side roller starts to rotate toward the slide plate by the interlocking mechanism. This causes the side roller to press the reinforcing bar in the middle of bending at the fulcrum block from both sides. It is bent by both the side roller and the side roller, and the bending process of about 180 ° becomes easy.

  After bending, when the slide plate is lifted and the engagement between the protrusion and the interlocking mechanism is released, the side roller is not pressed, and the side roller is moved away from between the side rollers. Is pushed away in the direction opposite to the slide plate side and rotated to the original position, so that the space between the side rollers is widened, and the rebar is easily detached from the side rollers.

  Next, a reinforcing bar bending machine according to a second aspect of the present invention is the reinforcing bar bending machine according to the first aspect, wherein one end of the interlocking mechanism is engaged with the protrusion, and the other end is interposed via a joint plate. The swing arm is connected to the holder.

  With such a configuration, it is possible to perform reliable operation with a simple mechanism using a swing arm and a joint plate.

  Next, a reinforcing bar bending machine according to a third aspect of the present invention is the reinforcing bar bending machine according to the second aspect, wherein the slide plate rises between the machine frame side and the holder to disengage the interlocking mechanism from the protrusion. In this case, a spring for returning the holder is stretched.

  By adopting such a configuration, the holder returns when the engagement between the interlocking mechanism and the protrusion is released, so that the side roller automatically returns to the original position, and the rebar can be easily detached from the side roller. Become.

  According to the reinforcing bar bending machine according to the present invention, at the time of bending the reinforcing bar, the reinforcing bar is first bent by the fulcrum block when the slide plate is lowered, but the protrusion of the slide plate and the interlocking mechanism are engaged, and the slide plate When the arm is lowered, the side roller moves together with the holder to the slide plate side by the interlocking mechanism, presses the reinforcing bar in the middle of bending from both sides, and bends the reinforcing bar at both the fulcrum block. The driving force during processing is also small.

  When the slide plate is lifted after the end of bending and the rebar is released from between the side rollers, if the engagement between the protrusion and the interlocking mechanism is released, the side roller is pushed away by the rebar or automatically restored by the spring. Therefore, the space between the side rollers is widened, so that the reinforcing bars can be easily detached from the side rollers, and the driving force at the time of separation can be reduced.

  Further, since the interlocking mechanism uses a swing arm and a joint plate, the manufacturing cost is low with a simple mechanism.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of the reinforcing bar bending machine of the present invention, FIG. 2 is a side view in which a part of the same is omitted, and FIGS. 3 to 5 are cross-sectional views showing the operation of the same.
The reinforcing bar bending machine of the present invention bends a mesh reinforcing bar integrally.

In the figure, reference numeral 1 denotes a machine frame. The machine frame 1 is formed of a C-shaped steel and has a base frame 2 that is long in the front and rear directions, and is parallel to the base frame 2 at a predetermined interval perpendicular to the longitudinal direction of the base frame 2. The partition plate 3 is fixed on the base frame 2.
Further, table plates 4 are fixed on both sides of the upper portion of the partition plate 3 in the longitudinal direction of the base frame 2.

A groove 5 is provided from the center of the upper end portion of the partition plate 3 toward the substantially central portion of the partition plate 3, and the groove 5 of each partition plate 3 is formed in the base frame 2 except for the front and rear partition plates 3. A slide plate 6 extending in the longitudinal direction is fitted so as to be movable up and down.
This slide plate 6 has a vertically long rectangular cross section, and is provided so that a fulcrum block 8 is positioned downward and above the slide plate 6 in accordance with the reinforcing bar interval of the mesh reinforcing bars 7 in the upper longitudinal direction. The fulcrum block 8 has a pressing portion 9 formed in a roller shape.
In addition, three guide bearings 10 that are engaged with both sides of the slide plate 6 are attached to both sides of the groove 5 of the partition plate 3 in the vertical direction.

Side rollers 11 are supported on a holder 12 in parallel with the slide plate 6 on both sides of the slide plate 6. The holder 12 is composed of a pair of plates 13, 13 partially sandwiching the partition plate 3, and the upper corner of the groove 5, which is the attachment portion of the holder 12 of the partition plate 3, is cut out 14.
The lower portion of the holder 12 is pivotally supported 15 by the partition plate 3 so as to be rotatable, and the corner portion on the upper slide plate 6 side is formed in an arc shape so that the side roller 11 is disposed. Reference numeral 11 denotes two rollers 16 provided in parallel with the side roller 11 between a pair of plate bodies 13 and 13, and a lower portion and a rear portion thereof are supported.
Both end portions of the side roller 11 are pivotally attached to the outer plate body 13 of the holder 12 provided on the front partition plate 3 and the outer plate body 13 of the holder 12 provided on the rearmost partition plate 3. 17 The two outer plate bodies 13 are not cut off at the corners on the upper slide plate 6 side, and form side walls 18, and the end portions of the side rollers 11 are pivotally attached 17 to the side walls 18. ing.

The holder 12 rotates only on the slide plate 6 side with the shaft support 15 as a fulcrum, and between the plate bodies 13 so that the rear portion of the holder 12 is supported on the edge of the notch 14 of the partition plate 3 so as not to rotate in the opposite direction. Is provided with a stopper (not shown). The stopper can also be provided on the partition plate 3 side.
A pin 19 is inserted into the holder 12 in parallel with the side roller 11, and one end of a joint plate 20 is rotatably attached to the pin 19.
The other end of the joint plate 20 is pivotally supported 22 at the upper end of a swing arm 21 disposed below the holder 12.

  The swing arm 21 rotates about a pivot 23 inserted into each partition plate 3 except for the front and rear partition plates 3, and the swing arm 21 is a pair of plates opposed to each other with a space therebetween. The lower end portion of the swing arm 21 is disposed closer to the slide plate 6 side, and a roller 25 is rotatably fixed between the lower end portions of the plate bodies 24 and 24.

Further, a connecting rod 26 is fixed between the front partition plate 3 and the holder 12 of the adjacent partition plate 3 and between the rearmost partition plate 3 and the holder 12 of the adjacent partition plate 3. 26, one end of a coil spring 27 is hooked, and the other end of the coil spring 27 is hooked to a tension bolt 29 provided on an L-shaped bracket 28 fixed to the front and rear partition plates 3.
The coil spring 27 constantly urges the holder 12 in the direction opposite to the slide plate 6. Thereby, the holder 12 of each partition plate 3 is urged in the same direction.

  A protrusion 30 is fixed to the side wall surface of the slide plate 6 at a position facing the swing arm 21. The protrusion 30 has an inclined surface 30a that gradually protrudes from the lower side to the upper side toward the side of the slide plate 6. The inclined surface 30a is the lower end of the swing arm 21 when the slide plate 6 is lowered. The roller 25 is engaged. Thus, when the slide plate 6 is further lowered, the swing arm 21 is rotated in a direction in which the lower end side is separated from the slide plate 6 side, and in a direction in which the upper end side is closer to the slide plate 6 side. Is turned to the slide plate 6 side. The swing arm 21 and the joint plate 20 constitute an interlocking mechanism.

The slide plate 6 is moved up and down by a hydraulic cylinder 31 installed on one side of the base frame 2 of the machine frame 1 at intervals in the longitudinal direction.
The hydraulic cylinder 31 is fixed to a mounting base 32 fixed on the base frame 2 with a cylinder rod 31a facing obliquely upward toward the slide plate 6 side.

  A bracket 33 is fixed to the tip of the cylinder rod 31a, and one end of a drive arm 34 is pivotally attached 35 to the tip of the bracket 33, and the drive arm 34 has a partition plate 3 at the foremost part and the rearmost part. The other end of the drive arm 34 is pivotally supported by a hanging piece 37 fixed to the lower surface of the slide plate 6 so that its upper end can be pivoted. A pivot 40 is pivotally supported at the lower end of the connecting plate 39. The hydraulic cylinder 31, the drive arm 34, and the connecting plate 39 constitute a drive device.

Next, the operation of the reinforcing bar bending machine having such a configuration will be described with reference to the drawings.
As shown in FIG. 3, the mesh rebar 7 is first placed on the table plate 4, and a portion that becomes a bent portion is disposed between the side rollers 11.
In the bent portion, the reinforcing bar 7 b intersecting with the reinforcing bar 7 a passed between the side rollers 11 is arranged above the slide plate 6 and below the fulcrum block 8. At this time, the slide plate 6 is raised.

  Next, as shown in FIG. 4, when the hydraulic cylinder 31 is operated so that the cylinder rod 31a of the hydraulic cylinder 31 extends, the drive arm 34 rotates in the direction shown by the arrow A in FIG. Thus, the slide plate 6 is lowered, and the presser portion 9 of the fulcrum block 8 presses the reinforcing bar 7b between the side rollers 11 from above, so that the reinforcing bar 7a is bent. FIG. 4 shows a state in which the reinforcing bar 7a is bent by 90 °.

Next, as shown in FIG. 5, when the cylinder rod 31 a of the hydraulic cylinder 31 is further extended, the slide plate 6 is further lowered, and the lower end of the swing arm 21 is placed on the inclined surface 30 a of the protrusion 30 of the slide plate 6. When the slide plate 6 is lowered, the lower end portion of the swing arm 21 is rotated in the direction opposite to the slide plate 6 side as shown by an arrow B in FIG.
Along with this rotation of the swing arm 21, the holder 12 is pushed toward the slide plate 6 by the joint plate 20 and rotates toward the slide plate 6 with the shaft support 15 as a fulcrum against the coil spring 27. The side roller 11 supported by the fulcrum block 8 presses and flexes the reinforcing bar 7a being bent from both sides.
FIG. 5 shows a state in which the reinforcing bar 7a is bent at approximately 180 °.

  When the reinforcing bar 7a is detached from between the side rollers 11 after the bending is completed, if the cylinder rod 31a of the hydraulic cylinder 31 is actuated in the direction of shortening, the slide plate 6 rises by the reverse of the above, and the swing arm 21 Since the engagement between the roller 25 at the lower end of the roller and the protrusion 30 of the slide plate 6 is released, the holder 12 is rotated in the direction opposite to the slide plate 6 side by the tensile force of the coil spring 27, and the side roller 11. The space is widened, and the rebar 7a can be easily detached.

It is sectional drawing which shows one embodiment of the reinforcing bar bending machine of the present invention. It is the side view which abbreviate | omitted one part which shows one Embodiment of this invention rebar bending machine. It is sectional drawing which shows the effect | action of this invention rebar bending machine. It is sectional drawing which shows the effect | action of this invention rebar bending machine. It is sectional drawing which shows the effect | action of this invention rebar bending machine. It is a fragmentary sectional view of the conventional reinforcing bar bending machine.

Explanation of symbols

1 machine frame 3 partition plate 6 slide plate 7 mesh rebar 8 fulcrum block 11 side roller 12 holder 15 shaft support 20 joint plate 21 swing arm 27 coil spring 30 protrusion 31 hydraulic cylinder

Claims (3)

  Side rollers are arranged on both sides of the slide plate that is moved up and down by the drive device in parallel with the slide plate, and fulcrum blocks are provided at predetermined intervals downward in the upper longitudinal direction of the slide plate. In the rebar bending machine in which the rebar is pressed and pulled between the side rollers when the slide plate is lowered, a holder that supports the side roller is provided on the machine frame side so as to be rotatable to the slide plate side, and the slide plate Protrusions are provided on both sides of the slide plate, and an interlocking mechanism that engages with the projections when the slide plate descends a predetermined distance and rotates the holder toward the slide plate as the slide plate descends is provided on both sides of the slide plate. It is arranged in the middle of bending by rotating the holder together with the fulcrum block Rebar bending machine, characterized by bending pressing from both sides of the reinforcing bars at the side rollers. 2. The reinforcing bar bending machine according to claim 1, wherein the interlocking mechanism is a swinging arm having one end engaged with the protrusion and the other end connected to the holder via a joint plate.   3. A spring is provided between the machine frame side and the holder, and a spring for returning the holder when the slide plate rises and the engagement between the interlocking mechanism and the projection is released is stretched. Rebar bending machine.

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