JPH09309506A - Binding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make is possible to provide an appropriate treatment in the case of a binding failure by detecting using a simple mechanism whether a string end part is properly kept and whether the string after binding is cut as to equipment for binding a string which is sent through a free end of a tensile detection lever and a binding arm tip around a workpiece to be bound. SOLUTION: This binding machine is provide with a first sensor 11 for detecting a tensile detection level 10 being at the 1st position when a string is not sent out, a second sensor 12 for detectomg the lever being at the 2nd position when the string is tent out and a third sensor for detecting a workpiece being in the process of being bound. A binding failure is decided when these sensors do not turn on in a correct order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding error in a binding machine including a binding arm for winding a cord around a work to be bound, and a binding mechanism including a series of members such as a beak for forming a knot. The present invention relates to a binding machine equipped with a device that detects

[0002]

2. Description of the Related Art In a binding machine, in order to prevent slack from occurring in a string wound around a work, a string is unrolled from a tip of a binding arm via a slack removing lever of the string. For example, in the binding arm swinging type binding machine, the work is applied by passing the tip of the binding arm through a string S stretched up and down between the tip and the string-holding button of the binding mechanism thereunder. Move, pull out the string as the work moves, put the string on the three sides of the work,
Moreover, the cord is wound around the work by lowering the binding arm, the knot is formed by the operation of the binding mechanism, and the cord is cut.
One unity cycle is completed.

[0003]

In such a bundling operation, the string pulled out from the tip of the bundling arm cannot be held by the string-holding button of the bundling mechanism due to some mistake.
Even if the work is fed in and the bundling arm is operated, the work cannot be strapped, and therefore the work cannot be bound. Also, if the cord is not cut completely by the cutter after the cord is hooked and the knot is formed, the work will be carried out while pulling out the cord. It hinders the binding and wastes the cord.

In order to solve such a problem, a device disclosed in Japanese Patent Application Laid-Open No. 7-137707 has been conventionally known, and in that device, a guide roller for guiding a binding cord is used, and A guide roller is provided with a metal piece which rotates therewith, the metal piece being sensed by a proximity switch, and therefore a rotating body (guide roller) is used and a slippage between the guide roller and the cord. It is speculated that a means to prevent

It is an object of the present invention to provide a binding machine capable of accurately detecting a binding error due to a disconnection of an end portion of a binding string or a defective cutting of the string after binding with a simple mechanism.

[0006]

In order to achieve the above object of the present invention, a binding machine according to the present invention is characterized in that a tension detecting lever supported by a spring for detecting the slack of a cord is provided.
The lever moves between a first position, which is occupied when the cord is not unrolled, and a second position, which is displaced against the elastic force of the spring when the cord is wound to wrap it around the work. And a first position detecting unit for detecting the lever at the first position for detecting a binding error.
Sensor, a second sensor for detecting that the lever is in the second position, and a third sensor for detecting that the work is being bound. . The tension detecting lever also plays a role of removing the slack of the cord.

In a preferred embodiment of the present invention, the controller includes a controller, with which the first sensor remains on or the second sensor does not turn on.
When the switch is turned on, it is detected that the string is not held by the string holding button of the binding mechanism, and the first sensor is not turned on before the next binding is started after the third sensor is turned off. It is designed to detect that the disconnection was not performed.

In another preferred aspect of the present invention, the elastic force of the spring when the tension detecting lever is displaced can be adjusted by a screw so that the tension of the string fed from the binding arm can be adjusted. It is possible.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an example of a binding machine according to the present invention. In this example, as in the case of the conventional example described above, it is embodied as a bundling arm swing type, and basically, The same as the conventional one, it is provided with a vertically swinging tying arm 1, and a cord bundle or reel.
The string S unwound from the reel passes through the tip 1a of the binding arm 1 via the tension detecting lever 10 and is restrained by the string-holding button 2a of the binding mechanism 2 provided below the strap S to almost vertically move. It is stretched vertically and ready for work bundling.

The tip 1a of the binding arm and the string-holding button 2a
The cord A stretched vertically on the table 3 is moved by sliding the work A placed on the table 3, and the cord is applied to the cord to extend the cord. As shown by the imaginary line in
The work is moved past the position of the tip 1a of the binding arm and moved to the binding position. In the process, the cord is attached to the three sides of the work, and then the binding arm 1 is pivoted downward. The string is wound around the entire circumference of the work by the movement, and the binding mechanism 2 is operated to form a knot and cut the string to complete one binding cycle.

In such a binding cycle, the tension detecting lever 10 also plays a role of preventing the string S from slackening, and is configured to be pivotable about its one end 10a as a fulcrum. When the string is unrolled from the tip 1a of the binding arm 1, the tension detecting lever 10 is displaced downward (pivoted), and when the unrolling of the string is stopped, the tension detecting lever 10 returns to the upper position and tension is applied to the string. give. In addition, in order to prevent the string from being unwound due to inertia, a tension load device that appropriately suppresses the string is installed at an appropriate position in the path of the string.

As shown in FIGS. 2 and 3, the binding machine is characterized in that it is provided with such a tension detecting lever 10 and that the tension detecting lever 10 occupies when the cord is not drawn out. Position 11 (the position shown in FIG. 2), and the tension detecting lever is displaced downward when the cord is unwound to wind the cord around the work A. Second sensor-1 for detecting the presence of the lever at a second position (position indicated by an imaginary line in FIG. 2) occupied by the lever
2 and a third sensor 13 (FIG. 1) for detecting that the work is being bound by the binding mechanism 2.

The third sensor 13 is an operation of one of the constituent elements of the binding mechanism 2, an operation of a main shaft or a main cam serving as a transmission member to the binding mechanism 2, and a press for pressing the work at the time of binding. It may be installed so as to detect by operation or the like, and may be shared with a sensor for detecting those operations, or may be provided independently for detecting a binding error.

As shown more clearly in FIG. 2, the tension detecting lever 10 is supported by the elastic force of the spring 14 provided between the tension detecting lever 10 and the column 15 standing on the frame 4. That is, the tension detecting lever 10 is displaced to the second position against the elasticity of the spring 14 when the tension detecting lever 10 is supported by the spring 11 at the first position and the string is unrolled. A coil spring is preferably used as the spring 14.

These first to third sensors-11 and 1
Sensors of the same type are used as 2 and 13, for example, limit switches are used, but other types of sensors such as proximity sensors may be used if desired. It is also clear that these sensors need not be of the same type, but may be of different types in some cases.

During operation of this binding machine, the first, second and third
Sensor operates as follows. First, before the work A is carried into the binding position, that is, the tip 1 of the binding arm 1.
In the state where the cord is stretched almost vertically between "a" and the cord holding button 2a, the tension detecting lever 10 is at the first position as shown in FIG. 2, and therefore the first sensor-11 is turned on. And the other two sensors-12, 13 are off.

Next, a work is applied to the string stretched between the tip 1a of the bundling arm and the string holding button 2a to move toward the bundling position, and when the string is unrolled, the tension is detected. Since the lever 10 is displaced downward, the second sensor
12 is on and the first and third sensors-11 and 13 are off. When the binding arm 2 is pivoted downward and the binding mechanism 2 is actuated, the third sensor 13 is turned on. While the knot is being formed and the string is being cut, the tension detecting lever 10 rises to its original upper position, and when it is completely restored, the first sensor 11 is turned on and the next binding is performed. Be prepared.

Therefore, as long as a normal bundling cycle is performed, the first, second and third sensors are turned on in this order, and the cycle is repeated. If the order in which these three sensors are turned on is incorrect, it is determined that the binding is wrong. When a binding error is determined, a sound or light is emitted by an appropriate alarm device to inform the user of the error.

Preferably, the elastic force of the spring 14 provided in the tension detecting lever 10 is adjustable, so that in this embodiment, one end of the spring 14 is fixed to the bolt 16 and fitted therein. The axial length of the spring 14 is expanded and contracted by the nut 17. Spring 1
By making the length of 4 adjustable, the tension of the string to be fed can be adjusted according to the size and quality of the work.

In a preferred form of this binding machine, a suitable controller 5 is provided for determining a binding error. That is, the controller plays a role in determining that the regular turn-on of the three sensors 11, 12, and 13 is out of order, and thus the first sensor-11 remains on or the second sensor-11 is turned on. If the third sensor 13 is turned on without the sensor being turned on, it means that the binding mechanism 2 has been actuated without the string being extended, and that the string is not held by the string holding button 2a of the binding mechanism 2. To detect.

When the first sensor 11 is not turned on before the next binding after the third sensor 13 is turned off, the string is continuously fed out and the tension detecting lever 10 is raised. It means that it does not return to the position and therefore detects that the string was not cut. When such a binding error is judged by the controller, the operation of the binding machine is stopped and an appropriate alarm signal is issued.

In the above embodiment, the binding arm swinging type is used, but the present invention is not limited to this, and another type of binding machine, for example, a type in which the binding arm rotates. It is obvious that the above can be applied similarly.

[0023]

As described above, according to the present invention, the three sensors associated with the tension detecting lever 10 are used to detect an inadequate restraint of the cord in the cord holding button or a binding error such as a defective disconnection of the cord. Therefore, it is possible to accurately detect a binding error with an extremely simple mechanism.

In addition to the sensor for detecting a binding error, a controller is provided so that the binding error can be properly determined and the fact that there is a binding error is notified by light or sound or both. it can.

Further, by adjusting the spring supporting the tension detecting lever with a screw, the tension of the string to be fed can be adjusted, and the tension of the string depending on the type of work to be bound. Allows adjustment.

[Brief description of drawings]

FIG. 1 is an elevation view schematically showing an entire binding machine according to an example of the present invention.

FIG. 2 is a side view showing a main part of the embodiment shown in FIG.

FIG. 3 is a plan view of a main part shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bundling arm 2 Bundling mechanism 5 Controller 10 Lever for tension detection 11 First sensor-12 Second sensor-13 Third sensor-14 Spring

Claims (3)

[Claims] 1. A tension detecting lever supported by a spring for detecting a slack of a string for binding an object to be bound, wherein the tension detecting lever has a first position and a wobbling position when the string is not unrolled. In a binding machine adapted to move between a second position which is displaced against the elastic force of the spring when the string is wound around to wind the string, in order to detect a binding error, A first sensor for detecting that the tension detecting lever is in the first position, and a second sensor for detecting that the tension detecting lever is in the second position. And a third sensor for detecting that the work is being bound. 2. The binding machine according to claim 1, further comprising: when the third sensor is turned on without turning on the first sensor or the second sensor is turned on, If the string is not held by the string-holding button and the first sensor is not turned on before the next binding after the third sensor is turned off, the string is cut. A bundling machine including a controller for detecting that nothing has been done. 3. The binding machine according to claim 1, wherein the elastic force of the spring when the tension detecting lever is displaced in order to adjust the tension of the string to be fed is adjustable by a screw. Characterizing binding machine.