Reinforcing bar binding machine

Patent metadata

Field	Value
Publication number	US-9453352-B2
Application number	US-201514640910-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Jul 1, 2005
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A reinforcing bar binding machine is provided with a device for detecting a power supply voltage during a binding wire twisting step subjected to the heaviest load and comparing the power supply voltage with a predetermined CPU operation voltage, and a control device for driving a motor in a reverse direction when the voltage has dropped below the predetermined CPU operation voltage. The power supply voltage during operation is monitored, and twisting operation is suspended before the voltage drops below the CPU operation voltage, whereby the binding wire twisting mechanism is returned to the initial position. Therefore, it is possible to prevent the binding wire twisting mechanism from being stopped while grasping the binding wire, when the CPU stops.

First claim

The invention claimed is:

1. A reinforcing bar binding machine comprising:
a binding wire feeding mechanism that feeds a binding wire which is wound around a reel to a binding wire guiding nose and forms a binding wire loop around a reinforcing bar;
a binding wire twisting mechanism that twists the binding wire loop formed around the reinforcing bar, by grasping and rotating the binding wire loop;
a power supply voltage detecting device;
a device for comparing a detected voltage of the power supply with a predetermined minimum operation voltage required to operate the reinforcing bar binding machine; and
a control device that drives a motor in a reverse direction, when the detected voltage of the power supply has dropped below the predetermined operation voltage, thereby to return the binding wire twisting mechanism to an initial position,
wherein the detection of the power supply voltage for controlling the return of the binding wire twisting mechanism to the initial position is carried out only during a reinforcing bar binding step.

2. The reinforcing bar binding machine according to claim 1 , further comprising a CPU, wherein rotation of the motor in a normal direction and in the reverse direction is switched by the CPU signaling control device, whereby one cycle of operation including feeding the binding wire, twisting the binding wire, and returning the binding wire twisting mechanism to the initial position is carried out.

3. A reinforcing bar binding machine comprising:
a binding wire feeding mechanism including a sleeve and adapted to feed a binding wire which is wound around a reel to a binding wire guiding nose and forms a binding wire loop around a reinforcing bar;
a binding wire twisting mechanism adapted to twist the binding wire loop formed around the reinforcing bar by driving a motor in a normal direction;
a power supply voltage detecting device;
a device for comparing a detected voltage with a predetermined voltage; and
a control part,
wherein the control part is adapted, during a binding wire twisting operation by the binding wire twisting mechanism,
if the detected voltage is higher than the predetermined voltage, to rotate the motor in a reverse direction so as to return the sleeve to an initial position, after the twisting operation proceeds, when an electric current flowing through the motor reaches a preset current value, and
to rotate the motor in the reverse direction so as to return the sleeve to the initial position, at a moment when the detected voltage drops to the predetermined voltage, and
wherein the power supply voltage detecting is adapted to detect a voltage of a power supply only during a reinforcing bar binding step.

Assignees

• Max Co Ltd

Inventors

• Kasahara Akira
• Matsuoka Atsushi

Classifications

• E04G21/122

  Machines for joining reinforcing bars · CPC title

• E04G21/123 Primary

  Wire twisting tools (bundling articles by twisting, e.g. wire B65B13/28; bundling rods, sticks, or like elongated objects with, e.g. wire B65B27/10; tying devices for hops, vines or trees with, e.g. wire A01G17/08) · CPC title

• B65B13/18 Primary

  Details of, or auxiliary devices used in, bundling machines {or bundling tools} · CPC title

• B65B13/28

  by twisting · CPC title

• E04G21/12

  Mounting of reinforcing inserts; Prestressing (shell tubes for prestressing members E04C5/10; anchoring means E04C5/12; connections of reinforcing elements and spacers E04C5/16) · CPC title