JP3727109B2 - Binding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is provided with a device for detecting a binding error in a binding machine including a binding arm for winding a string around a work to be bound, and a binding mechanism composed of a series of members such as a beak for forming a knot. It relates to binding machines.
[0002]
[Prior art]
In the binding machine, the string is pulled out from the leading end of the binding arm via the slack removing lever of the string to prevent the string wound around the work from being slackened. For example, in a binding arm swinging type binding machine, a work is applied to a string S stretched vertically between the leading end of the binding arm and the string holding button of the binding mechanism below the binding arm. Moves, pulls out the string as the work moves, attaches the string to the three sides of the work, winds the string around the work by lowering the binding arm, and forms a knot by operating the binding mechanism The string is cut and one binding cycle is completed.
[0003]
[Problems to be solved by the invention]
In such a bundling operation, even if the string pulled out from the tip of the bundling arm is not restrained by the string holding button of the bundling mechanism due to some mistake, the work is fed and the bundling arm is operated. The work cannot be tied and therefore the work cannot be bound. In addition, if the string is not completely cut by the cutter after the work has been tied and the knot has been formed, the work will be carried out while the string is pulled out. Tying is hindered and the string is wasted.
[0004]
In order to solve such a problem, what is disclosed in Japanese Patent Application Laid-Open No. 7-137707 is conventionally known. In this apparatus, a guide roller for guiding a binding string is used, and the guide roller is used. A metal piece that rotates together with the metal piece, and the metal piece is detected by a proximity switch, and therefore uses a rotating body (guide roller) and does not cause slippage between the piece and the string. It is presumed that means to do so is necessary.
[0005]
An object of the present invention is to provide a bundling machine capable of accurately detecting a bundling error due to a defective cutting of a bundled string in addition to the removal of the end of a bundling string by a simple mechanism.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object of the present invention, the binding machine according to the present invention is characterized by comprising a tension detecting lever supported by a spring for detecting slack of the string, and the lever is occupied when the string is not pulled out. In order to detect a binding error while moving between a position and a second position that is displaced against the elasticity of the spring when the string is wound out to wind the string around the workpiece, In addition to the second sensor for detecting that the lever is in the second position and the third sensor for detecting that the workpiece is being bound, the lever is in the first position. And the first, second, and third sensors are sequentially turned on in this order in a normal binding cycle . The tension detecting lever also serves to take up the slack of the string.
[0007]
In a preferred embodiment of the present invention includes a controller, cutting of the cord is performed by the first sensor before the third sensor Ri by the said controller enters the next binding after turned off does not turn on It has come to detect that there was no.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
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, like the conventional example described above, it is embodied as a binding arm oscillating type, basically. Is provided with a bundling arm 1 of a vertically swinging type like a conventional one, and a string S unwound from a string bundle or a reel is bound to a bundling arm 1 via a tension detecting lever 10. The strap is held by the string holding button 2a of the bundling mechanism 2 provided below the front end 1a and stretched substantially vertically in the vertical direction to prepare for bundling the work.
[0010]
The work A placed on the table 3 is slid and moved with respect to the string stretched almost vertically between the tip 1a of the binding arm and the string holding button 2a. -A string is drawn by applying a work, and as shown by an imaginary line in FIG. 1, the work is moved to the bundling position through the position of the tip 1a of the bundling arm. Then, the string is wound around the entire circumference of the work by the downward pivoting of the binding arm 1, and the knot is formed and the string is cut by the operation of the binding mechanism 2. End the binding cycle.
[0011]
In such a binding cycle, the tension detecting lever 10 also serves to prevent slack in the string S, and is configured to be pivotable about one end 10a thereof. When the string is pulled out from the front end 1a of the binding arm 1, the tension detecting lever 10 is displaced (pivoted) downward, and when the string stops being pulled back, it returns to the upper side and tension is applied to the string. give. In order to prevent the string from being unwound due to inertia, a tension load device that moderately holds the string is installed at an appropriate position in the string passage.
[0012]
As shown in FIGS. 2 and 3, the binding machine is provided with such a tension detecting lever 10, and the tension detecting lever 10 occupies a first position when the string is not pulled out ( The first sensor 11 that detects the presence at the position shown in FIG. 2 and the tension detecting lever that is displaced downward when the string is pulled out to wrap the string around the work A. The second sensor 12 that detects the presence of the lever at the position 2 (the position indicated by the imaginary line in FIG. 2) and the binding mechanism 2 detect that the work is being bound. Including a third sensor-13 (FIG. 1).
[0013]
The third sensor 13 is operated by one of the components of the bundling mechanism 2, or the operation of the main shaft or main cam serving as a transmission member for the bundling mechanism 2, or the operation of the press that presses the work during bundling. It may be installed to detect and may be shared with a sensor for detecting their operation, but may be provided independently for detecting a binding error.
[0014]
As shown more clearly in FIG. 2, the tension detecting lever 10 is supported by the elasticity of a spring 14 provided between the tension support lever 15 standing on the frame 4. When the string is pulled out and supported by the spring 11 at the first position, the tension detecting lever 10 is displaced to the second position against the elasticity of the spring 14. As the spring 14, a coil spring is preferably used.
[0015]
These first to third sensors 11, 12, 13 are of the same type, for example limit switches are used, but other types of sensors such as proximity sensors can be used if desired. May be. It is also clear that these sensors do not have to be the same type of sensor, and in some cases may be different types of sensors.
[0016]
When the binding machine is operated, the first, second, and third sensors operate as follows. First, in a stage before the work A is carried into the binding position, that is, in a state where the string is stretched almost vertically between the leading end 1a of the binding arm 1 and the string holding button 2a, the tension detecting lever is used. 2 is in the first position, as shown in FIG. 2, so that the first sensor 11 is on and the other two sensors 12, 13 are off.
[0017]
Next, a work is applied to the string stretched between the leading end 1a of the binding arm and the string holding button 2a to move toward the binding position. When the string is pulled out, the tension detecting lever 10 Is displaced downward, the second sensor-12 is turned on, and the first and third sensors-11 and 13 are in the off state. When the bundling mechanism 2 is actuated after the bundling arm 1 is pivoted downward, the third sensor 13 is turned on. While the knot is being formed and the string is being cut, the tension detecting lever 10 is raised toward the upper original position, and when fully restored, the first sensor 11 is turned on and the next binding is performed. Provided.
[0018]
Therefore, as long as a normal binding cycle is performed, the first, second, and third sensors are sequentially turned on in this order, and the cycle is repeated. If the order in which these three sensors turn on is out of order, it is determined that a binding error has occurred. When a binding error is determined, a sound or light is emitted from an appropriate alarm device to notify the fact.
[0019]
Preferably, the elasticity of the spring 14 provided in the tension detecting lever 10 is adjustable, and in this embodiment, one end of the spring 14 is fixed to the bolt 16 and a nut 17 fitted to the bolt. The axial line length of the spring 14 is expanded and contracted. By making the length of the spring 14 adjustable, the tension of the string to be pulled out can be adjusted according to the size, quality, etc. of the workpiece.
[0020]
In the preferred form of the binding machine, a suitable controller 5 is provided for determining binding errors. That is, the controller serves to determine that the normal order of the three sensors 11, 12, and 13 is out of order, so that the first sensor 11 remains on or the second sensor When the third sensor 13 is turned on without the sensor being turned on, the string is not pulled out and the binding mechanism 2 is operated, and the string holding button 2a of the binding mechanism 2 is not restrained. To detect.
[0021]
Further, if the first sensor 11 does not turn on after the third sensor 13 is turned off and before the next bundling is entered, the string is continuously pulled out and the tension detecting lever 10 returns to the raised position. This means that no string is cut. When such a binding error is determined by the controller, the operation of the binding machine is stopped and an appropriate alarm signal is issued.
[0022]
In the above embodiment, the bundling arm swinging type is used. However, the present invention is not limited to this, and other types of bundling machines, for example, a bundling arm rotating type. Obviously, it can be applied as well.
[0023]
【The invention's effect】
As described above, according to the present invention, since the three sensors related to the tension detecting lever 10 detect a binding error that is a deficiency in string holding in a string holding button or a string cutting failure, it is extremely simple. This makes it possible to accurately detect binding errors.
[0024]
Further, by providing a controller in addition to the sensor for detecting the binding error, it is possible to appropriately determine the binding error and notify that the binding error has occurred by light and / or sound.
[0025]
Furthermore, the tension of the string that is pulled out can be adjusted by adjusting the spring that supports the tension detection lever with a screw, and the tension of the string can be adjusted according to the type of work for the object to be bound. To.
[Brief description of the 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 the main part shown in FIG. 2;
[Explanation of symbols]
1 Bundling arm 2 Bundling mechanism 5 Controller 10 Tension detection lever
11 First sensor
12 Second sensor
13 Third sensor
14 Spring

Claims (2)

A tension detecting lever supported by a spring for detecting slack of the string for binding the object to be bound; the tension detecting lever is a first position occupied when the string is not pulled out; In a binding machine that is adapted to move between a second position that is displaced against the elasticity of the spring when pulled out,
In order to detect a binding error, in addition to a second sensor that detects that the tension detecting lever is in the second position and a third sensor that detects that a workpiece is being bound, A first sensor for detecting that the tension detecting lever is in the first position is provided so that the first, second, and third sensors are sequentially turned on in this order in a normal binding cycle. A bundling machine characterized by becoming .   2. The binding machine according to claim 1, wherein after the third sensor is turned off, the first sensor is not turned on before entering the next binding, thereby detecting that the string has not been cut. A binding machine comprising a controller.

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