JPH0913676A - Driving gear switching mechanism in reinforcement binding machine - Google Patents

Abstract

PURPOSE: To enable the whole works necessary for binding reinforcements by switching reciprocal rotation of an electric motor, switching its output to a first driving gear and a second driving gear, and performing a feed and a twist of a wire. CONSTITUTION: An output gear 12 is fixed to an output shaft of an electric motor 11, and a transmission gear 13 meshes with it. This transmission gear 13 is arranged so as to be movable in a moving groove 14 arranged on a circular arc with the axis of the output gear 12 as the center. First and second driving gears 15 and 16 are arranged in the vicinity of both ends of the moving groove 14. The first gear 15 is connected to a wire feeder 3, and the second gear 16 is connected to a twisting device 5. The transmission gear 13 moves to the left side of the moving groove 14 by torque of the output gear 12 by anticlockwise directional rotation of the electric motor 11, and meshes with the first driving gear 15 on its moving end, and the wire feeder 3 is actuated, and performs prescribed winding and cutting work. When the electric motor 11 is inversely rotated, the transmission gear 13 moves to the left side of the moving groove 14, and meshes with the second driving gear 16 on its moving end, and the twisting device 5 is actuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar binding machine for feeding a binding wire in a loop shape, winding the wire around a reinforcing bar, and then twisting and tightening a part of the loop. The present invention relates to a drive gear switching mechanism that switches and operates drive gears that operate respective twisting devices for twisting with a common single electric motor.

[0002]

2. Description of the Related Art In general, when reinforced concrete is applied to a building or a structure, concrete is laid after bundling rebars crossed vertically and horizontally. Recently, bundling of rebars has been performed by a rebar tying machine. ing. As an example of such a reinforcing bar binding machine, the applicant of the present invention uses the actual Kaihei 5-3
As disclosed in Japanese Patent No. 494, a wire is wound around a reinforcing bar in a loop shape, and then a part of the loop is gripped by a hook and rotated to be fixed by twisting.

As described above, the binding machine is provided with a wire feeding device and a twisting device for twisting the wire, and each device is provided with a dedicated drive electric motor.

However, since two electric motors must be provided in this way, a large space must be provided, and the weight is heavy, so that the cost must be increased.

[0005]

An object of the present invention is to solve the above-mentioned drawbacks and to provide a drive gear of a reinforcing bar binding machine capable of driving a feeding device for feeding a reinforcing bar by switching the output of one electric motor and a twisting device for twisting a wire. Its purpose is to provide a switching mechanism.

[0006]

In order to achieve the above object, a drive gear switching mechanism in a reinforcing bar binding machine according to the present invention includes a wire feeding device for feeding a reinforcing bar binding wire to the outside, and a wire feeding device for feeding the reinforcing bar binding wire to the outside. A guide part that bends the bent wire so that it becomes a loop,
A twisting device for gripping and tightening a part of a loop of a wound wire, wherein the wire feeding device and the twisting device are operated by an electric motor, and a reinforcing bar binding machine is fixed to an output shaft of the electric motor. The transmission gear is engaged with the transmission gear, and the transmission gear is movably provided on an arc centered on the axis of the output gear, and the transmission gear is attached to the transmission gear when the transmission gear is located at one moving end. A first driving gear that meshes with the first driving gear and a second driving gear that meshes with the transmission gear when the transmission gear is positioned at the other moving end are provided, and one of the first driving gear and the second driving gear is provided. Is linked to the wire feeding device, and the other is linked to the twisting device.

[0007]

When the electric motor is rotated to one side, the transmission gear meshing with the output gear is moved to one side by the rotational force of the output gear while rotating, and at the moving end thereof, one of the first and second drive gears is moved. Since they mesh with each other, the wire feeding device linked to this drive gear operates to feed the wire, and after the wire is fed by a specified amount and wound around the rebar, the wire feeding device is stopped by stopping the electric motor. To do. Then, when the electric motor is rotated in the reverse direction, the transmission gear moves to the opposite side and meshes with the first or second other drive gear at its moving end, so that the twisting device associated with this drive gear operates and the wire is activated. Is twisted, and tightening is performed on the reinforcing bar,
The unity ends.

[0008]

1 and 2 show an essential part of a reinforcing bar binding machine, which is a wire 2 wound around a spool 1.
A wire feeding device 3 for feeding the wire forward, a guide portion 4 for guiding the fed wire 2 so as to be looped around the intersection of the reinforcing bars a, and a twisting device 5 for gripping and tightening the wire 2. And a cutting device 6 for cutting the loop from the original wire 2, and the wire 2 fed out by the wire feeding device 3 by pulling the trigger lever 7 is wound around the reinforcing bar a in a loop shape and cut. After that, the wire 2 is twisted by gripping and rotating a part of the loop by the twisting device 5, and the reinforcing bar a is wound and bound. The wire feeding device 3 and the twisting device 5 are the electric motor 1
Operates by 1. Reference numeral 8 denotes a guide arm that guides the wire 2 so as not to swing sideways when twisted by the twisting device 5. The basic structure and operation of these are the same as those shown in the above publication.

The wire feeding device 3 is constructed so that the wire 2 is fed out by the rotation of a feeding roller (not shown) and then cut. The twisting device 5 is a twisting hook 9 at the tip of the twisting shaft.
Is provided so as to be openable and closable, and by applying a ball screw, the torsion shaft 10 is moved forward and backward by the forward and reverse rotations of the drive gear, and then the hook 9 is closed to grasp the wire 2, and the torsion shaft 10 is normally rotated. Then, the wire 2 is twisted and tightened, and then the hook 9 is opened by the reverse rotation of the drive gear to remove the wire 2, and then the torsion shaft 10 is returned to its original position. However, the twisting device 5 is not limited to this example. For example, a configuration may be adopted in which a split groove is formed at the tip of the twisting shaft so that the wire fed in a loop shape may pass through, and after the wire feeding, the twisting shaft is rotated to twist the wire.

Next, each of the above devices is constructed so as to be operated by a common electric motor. That is, as shown in FIGS. 3 and 4, the output gear 12 is fixed to the output shaft of the electric motor 11, and the transmission gear 13 is meshed with the output gear 12. The transmission gear 13 is a moving groove 1 provided on an arc centered on the axis of the output gear 12.
4 is movably provided. A first drive gear 15 and a second drive gear 16 are arranged near both ends of the moving groove 14. The first drive gear 15 is linked to the wire feeding device 3, and the second drive gear 16 is linked to the twisting device 5. Then, the first drive gear 15 meshes when the transmission gear 13 is located at one of the moving ends of the moving groove 14, and the second drive gear 16 has the transmitting gear 13 at the other moving end thereof. It is provided so as to mesh when it is located.

The wire 2 is cut by operating the same first drive gear 15 after the wire 2 has been fed by the wire feeding device 3 by a predetermined amount.

Therefore, according to the above configuration, when the electric motor 11 is rotated counterclockwise in FIG. 2, the output gear 1 is rotated.
The transmission gear 13 that meshes with the output gear 12 rotates while rotating.
Is moved to the left side of the moving groove 14 by the rotational force of and meshes with the first drive gear 15 at its moving end, so that the wire feeding device 3 is actuated to feed the wire 2, and the wire 2 is fed by a predetermined amount. The wire 2 is cut after being wound around
By stopping the electric motor 11, the wire feeding device 3 stops. Then, when the electric motor 11 is rotated in the reverse direction, the transmission gear 13 moves to the right side of the moving groove 14 as shown in FIG. 5, and meshes with the second drive gear 16 at its moving end, so that the twisting device 5 operates. The wire 2 is twisted, and the binding is completed by winding.

The same applies when the first drive gear 15 and the second drive gear 16 are linked to the twisting device 5 and the wire feeding device 3, respectively.

[0014]

According to the present invention, the output of the electric motor is switched between the first drive gear and the second drive gear by the forward and reverse rotations of the electric motor to feed and twist the wire. Will perform all the work needed to bind the reinforcing bars.

Therefore, since one electric motor and a mounting space for the electric motor can be saved, the reinforcing bar binding machine can be made compact and lightweight.

[Brief description of the drawings]

FIG. 1 is a side view showing an outline of a reinforcing bar binding machine.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a front view showing a drive gear switching mechanism of the binding machine.

FIG. 4 is a side view of the drive gear switching mechanism.

FIG. 5 is an operation explanatory diagram of the drive gear switching mechanism.

[Explanation of symbols]

 a rebar 2 wire 3 wire feeding device 5 twisting device 11 electric motor 12 output gear 13 transmission gear 15 first drive gear 16 second drive gear

Claims (1)

[Claims] 1. A wire feeding device for feeding a wire for binding reinforcing bars to the outside, a guide portion for bending the wire fed by the wire feeding device so as to form a loop, and a loop of the wound wire. A reinforcing bar binding machine, comprising a twisting device for gripping and tightening a part of the wire feeding device and the twisting device operated by an electric motor, wherein a transmission gear meshes with an output gear fixed to the output shaft of the electric motor. The transmission gear is provided so as to be movable on an arc centered on the shaft center of the output gear, and a first drive gear that meshes with the transmission gear when the transmission gear is located at one moving end is provided. A second drive gear that meshes with the transmission gear when the transmission gear is located at the other moving end is provided, and one of the first drive gear and the second drive gear is connected to the wire feed device. It is linked to the other of the switching mechanism of the drive gear in the reinforcing bar binding machine, characterized in that is linked to the twisting device.