JP3050369B2 - Wire discrimination mechanism in reinforcing bar binding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire discriminating mechanism in a rebar tying machine for discriminating a wire type and automatically setting a torsional torque corresponding to the wire.

[0002]

2. Description of the Related Art Generally, when reinforced concrete is applied to a building or a structure, concrete is laid after bundling rebars crossed vertically and horizontally. Has become. In this rebar tying machine, as shown in FIG. 4, a main switch 20 is turned on, and a wire 21 is sent out by pulling a trigger 21 at the time of tying. After winding around the intersection of 24, a part of the loop is grasped by a torsion hook and twisted and rotated to bind the wire. etc)
And manually changing the torsional torque according to the selected wire. In this case, if the wires are not bound with an appropriate torsional torque, the binding power is insufficient or the thread breaks. Therefore, the torsional torque is manually switched by operating the torque adjusting dial 25.

[0003]

However, it is troublesome to manually change the torque each time according to the type of wire, and when changing the type of wire frequently, the switching may be forgotten. There was a fear that correct unity could not be achieved.

[0004] The present invention solves the above-mentioned problems, and by simply setting the spool, determines the type of the wire and automatically adjusts the optimal torsional torque for the wire, thereby avoiding a mistake in the binding operation. It is another object of the present invention to provide a wire discriminating mechanism in a binding machine capable of improving work efficiency.

[0005]

In order to solve the above-mentioned problems, a wire discriminating mechanism in a rebar tying machine according to the present invention comprises: a wire feeder for feeding a wire for rebar tying;
A guide arm that guides the fed wire so as to loop around the rebar intersection, a torsion device that grips a part of the loop of the wound wire and twists the wire, and a wire on the original side And a cutting device for cutting the loop from the wire. The spool around which the wire is wound is provided with display means for displaying the type of the wire, and the rebar binding machine detects the display means. Means,
And a control means for judging the type of the wire based on the result detected by the detection means and automatically changing the torsion torque of the torsion device in accordance with the wire.

[0006]

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

FIG. 1 shows a main part of a reinforcing bar binding machine. The reinforcing bar binding machine includes a wire feeder 2 for sending a wire 1 wound around a spool 7 forward, and a wire 1 which has been sent out.
A guide arm 3 for winding the wire 1 into a loop, a twisting device 4 for gripping and twisting a part of the wound wire 1, and a cutting device 5 for separating the loop from the original wire 1. The wire feeding device 2, the twisting device 4, and the cutting device 5 are provided in the binding machine main body and are operated by a motor.

In the above-mentioned rebar tying machine, the main switch is turned on, and the wire 1 is sent out from the spool 7 by the wire feeder 2 by pulling the trigger 8 when the rebars a and b are tied. After being wound in a shape, a part of the loop is gripped by the torsion device 4 with the hook 9 and twisted and rotated, and the cutting device 5 cuts and separates the loop from the original wire 1. is there.

The spool 7 is provided with display means A for indicating the type (iron, stainless steel, etc.) and thickness of the wire 1 wound on the spool 7. The display means A is provided on the rebar binding machine. And a control means C for automatically adjusting the torsion torque of the torsion device based on the result detected by the detection means B.

[0010] The display means A comprises a reflective seal 10 adhered to one side of the spool 7.
For 0, an aluminum foil tape having an adhesive layer formed on the back surface may be used. It is sufficient that the distance from the center of the support shaft 7a is set in advance for the reflection seal 10 in accordance with the type of the wire 1 and at least one portion is adhered on a concentric circle.
Note that the environment in which the rebar tying machine is used is not necessarily a good environment (there is also use under rainy weather). Therefore, it is desirable to provide a plurality of concentric circles on the assumption that the reflective seal 10 is peeled off.

The detecting means B comprises a photo sensor (reflection type photo interrupter) 11, and one of the support portions 12 for supporting the spool 7 (the side corresponding to the side surface of the spool on which the reflection seal 10 is adhered). It is located on the inside surface of the. The photo sensor 11 is arranged at a predetermined distance around a bearing 13 that supports the spool 7. It goes without saying that the position of the photo sensor 11 corresponds to the reflection seal 10 attached to the spool 7.

The control means C includes a microprocessor (MP)
U), the presence or absence of the detection signal of the photosensor 11 is determined based on a program stored in the internal memory, and the type of the wire 1 is determined based on which photosensor 11 has detected the reflective seal 10. The current control circuit 14 is controlled to automatically change the current flowing through the motor 6 that drives the torsion device 4 so that the torsion device 4 operates with the optimum torsion torque for the wire 1. (See FIG. 3). Reference numeral 16 denotes a DC-DC converter that converts a voltage supplied from the battery pack 15 into an IC-level voltage for operating the detection unit B and the control unit C.

According to the rebar tying machine of the above construction, as shown in FIG. 2, a fully charged battery pack 15 is mounted, and the spool 7 on which the wire is wound is loaded on the tying device. Into the guide groove (not shown) of the wire 1, turn on the main switch 17, pull the trigger 8,
The wire feeder 2 is operated to feed the leading end of the wire 1 idle to a predetermined position.

At this time, since the spool 7 rotates and the reflective seal 10 passes through the front surface of the photosensor 11, the light emitted from the light emitting element of the photosensor 11 is reflected by the reflective seal 10, and the reflected light is reflected by the photosensor 11 And a detection signal is sent to the control means C. The control means C determines the type of the spool 7 (the type of the wire 1) from the detection signal of the photo sensor 11, sets the current flowing through the motor 6 to an optimal current value for the wire 1, and automatically determines the torsional torque. I do.

A microswitch (not shown) for recognizing that the spool 7 has been set on the bearing 13 of the support portion 12 may be provided. In this case, the control means C judges the detection signal of the photo sensor 11 on condition that the micro switch is turned on, and once detects the photo sensor 11, ignores the detection signal of the photo sensor 11 to be detected thereafter, and The motor 6 can be rotated with the same torque until is turned off.

Further, by attaching a plurality of reflective seals 10 in the radial direction of the spool 7 and combining the plurality of reflective seals 10, more types of wires can be identified. Needless to say, one type of wire can be displayed even when the reflective seal 10 is not attached.

Further, the display means A is a reflective seal 10
However, the present invention is not limited to this. The detection means B may be constituted by a barcode scanner and a barcode scanner, or a magnet may be embedded in the side of the spool 7 and detected by a magnetic sensor such as a reed switch or a Hall element. Alternatively, a concave portion or a convex portion may be formed on the side surface of the spool 7, and the type of the spool (the type of wire) may be determined by detecting the concave and convex portions with a roller lever type micro switch.

The display means 4 may be provided on a part of the peripheral surface of the spool 7.

[0019]

According to the present invention, by simply loading a spool around which a wire is wound around a rebar tying machine, pulling a trigger and feeding the wire idle, the type of wire is determined and the torsional torque is automatically increased. Since it can be adjusted, there is no need to change the torsional torque with a dial or switch one by one according to the type of wire. It can be avoided, and a safe and efficient bundling operation of the rebar can be performed.

[Brief description of the drawings]

FIG. 1 is a side view of a reinforcing bar binding machine to which a wire discriminating mechanism according to the present invention is applied.

FIG. 2 is a perspective view of the reinforcing bar binding machine.

FIG. 3 is a block diagram of the wire discrimination mechanism.

FIG. 4 is a perspective view showing a use state of a conventional reinforcing bar binding machine.

[Explanation of symbols]

 Reference Signs List 1 wire 2 wire feeder 3 guide arm 4 twisting device 5 cutting device 6 motor 7 spool 8 trigger A display means B detection means C control means

Claims (1)

(57) [Claims] 1. A wire feeder for feeding a wire for reinforcing bar binding, a guide arm for guiding the fed wire to loop around a rebar intersection, and one of a loop of the wound wire. In a rebar tying device provided with a torsion device for gripping and torsionally tightening a portion and a cutting device for cutting a loop from an original wire, a display for indicating the type of the wire is displayed on a spool around which the wire is wound. Means, a detecting means for detecting the display means in the rebar tying machine, a type of wire is determined based on a result detected by the detecting means, the torsion torque of the torsion device corresponding to the wire A wire discriminating mechanism in a rebar tying machine, comprising: control means for automatically changing the wire binding mechanism.