JP4188063B2 - String knot inspection method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of an automatic stringing machine (also referred to as an automatic binding machine) that winds a string around an article and forms a knot to bind, and particularly relates to a method and an apparatus for inspecting a knot that automatically binds a string.
[0002]
[Prior art]
An automatic strapping machine is a device that automatically performs a series of operations for tying a knot and tying an article that is an object to be bound. In the following, the automatic tying machine will be described with the subject matter of knot formation, which is the subject of the present invention, and description of other mechanisms and operations such as tying to the objects to be bound will be omitted.
[0003]
FIG. 4 shows a state where the previous tying process has been completed until the next tying process is completed. In FIG. 4, the string 3 is wound around the object 1, the string end 3 a of the previously cut string is pressed by the string presser 10, and is wound around the knot-forming beak 2. Is shown. The string retainer 10 is one member of a cutter table described later, and only the string retainer 10 is shown here for the sake of simplicity.
[0004]
Thereafter, two knots 3 are sandwiched between the beaks 2 to form knots, and the beaks 2 are retracted and pulled out from the string loops wound around the beaks 2 to form knots. Here, almost simultaneously with the start of the beak 2, a cutter (not shown) provided on the cutter table is operated to cut the longer string with the knife, and simultaneously remove the string end 3 a from the string presser 10. Pull to complete the knot. FIG. 5 schematically shows a state in which the string end 3 a of the string 3 is sandwiched between the string presser 10 and the presser base 11 and the other string 3 is wound around the string presser 10.
[0005]
The knot formed as described above (see FIG. 8) is called a double knot. In FIG. 8, 3b indicates the knot of the string 3.
For example, Japanese Patent Application Laid-Open No. H10-133707 discloses details of string binding by an automatic stringer.
FIG. 6 is a schematic diagram for explaining the operation of the cutter base 9 including the string presser 10 described above. The cutter base 9 is provided with a string presser 10 and a presser base 11 that have a function of sandwiching and winding a string. After the knot is formed, one string is cut with a knife 15, and the other clamped string is clamped. A cutter 14 having a function of being pulled out by being caught in the cutter groove 14a is provided. Reference numeral 16 denotes a knife presser.
[0006]
In FIG. 6, the string presser 10 is pressed against the presser foot 11 by the string presser spring 12, and the string presser lever 13 is operated by the string presser lever operating mechanism 19 so that one end of the string can be sandwiched (see FIG. 5). ). Further, the cutter lever 17 can be operated by the cutter lever operating mechanism 18, and the string can be cut by the knife 15 and pulled by hooking the string by the cutter groove 14a. FIG. 7 is an essential part assembly diagram of the cutter base. In addition, in FIG. 7, description of a cutter lever, a string presser lever, etc. is abbreviate | omitted.
[0007]
[Patent Document 1]
Japanese Patent Publication No. 55-9325 [0008]
[Problems to be solved by the invention]
By the way, if there is a maintenance failure or maintenance inspection failure of the cutter base, the spring pressure to hold the string with the string presser is not appropriate, or there is an abnormality such as the string presser clogging the operating part of the string presser, it will be caught The end of the existing string is removed before the knot is formed, and a single knot as shown in FIG. 9 is obtained. In this case, the knot 3b is formed once and seems to be tied at first glance, but actually the string end 3a side is not tied, so it will come off with a slight force, and the string will unwind It will end up.
[0009]
The present invention is applied to an automatic tying machine, accurately detects such an abnormality that becomes a single knot, and can determine whether a knot becomes a normal two knot or not. Methods and apparatus are provided.
[0010]
[Means for Solving the Problems]
The present invention solves the above problems by the knot knot inspection method and apparatus described in the following items.
(1) A method for inspecting a knot of a string in an automatic stringing machine that wraps a string around an object to be bound, forms a knot, and ties the string, and after the knot of the string is formed, sandwiched between the string presser and the presser foot A method for inspecting a knot of a string, comprising a step of monitoring a string holding state of the string presser and a presser base as a pre-process for pulling out the string end side.
(2) Based on the air pressure of the air ejected from the air outlet formed at the holding position of the string clamped between the string presser and the presser foot and formed on the side of the presser foot. When the air pressure is equal to or higher than a predetermined value, it is determined that the air outlet is blocked by a string, the string is normally clamped, and the knot has two knots. String knot inspection method.
(3) The holding state monitor is on the path of the string sandwiched between the string presser and the presser foot, from an air outlet formed at a position on the presser foot where the string is attached by tension. Perform based on the air pressure of the jetted air, and if the air pressure is equal to or greater than a predetermined value, determine that the air outlet is closed by the string, the string is normally held, and the knot is a double knot The method for inspecting a knot of a string according to the above (1), characterized by:
(4) The clamp state is monitored by the presser pressure detector attached to the presser foot at the position where the strap clamped between the presser foot and the presser foot, and detected by the presser pressure detector. If the string is equal to or greater than a predetermined value, it is determined that the string is normally pinched and the knot has two knots.
(5) A method for inspecting a knot of a string in an automatic stringing machine that wraps a string around an object to be bound, forms a knot, and ties the string, and after the knot of the string is formed, the knot is clamped between a string presser and a presser foot A knot inspection method for a string, comprising a step of monitoring a pulling force when the string on the string end side is pulled out.
(6) A cutter lever operating mechanism that operates the cutter lever when operating the cutter through the cutter lever and hooking the string on the end of the string into the cutter groove formed in the cutter and pulling it out. If the operating force detected by the cutter operating force detector is equal to or greater than a predetermined value, it is determined that the string is normally clamped and the knot has two knots. A method for inspecting a knot of a string according to (5) above, characterized in that:
(7) A string knot inspection device provided in an automatic stringing machine that wraps a string around an object to be bound and forms a knot to perform stringing, and includes a string presser that clamps the string on the string end side. As a pre-process for pulling out the clamped string after forming the knot of the string, the monitor means is provided with a presser foot, and has a monitor means for monitoring the clamped state of the strap by the strap presser and the presser foot. A knot inspection device for a string, characterized by monitoring a pinched state.
(8) As the monitoring means, an air jet port formed at a holding position of the cord clamped between the cord presser and the presser foot and formed on the presser foot side, and an air supply for supplying air to the air jet outlet Based on the air pressure that is attached to the air supply line, the air supply line, and detects the air pressure of the supply air, and the air pressure detected by the air pressure gauge, if the air pressure is a predetermined value or more, The air spout is closed by a string, the string is normally clamped, and a string control device having a function of determining that the knot has two knots is provided, 7) Knot inspection device for strings
(9) As the monitoring means, an air jet port formed on a path of the string sandwiched between the string presser and the presser base and formed at a position on the presser base where the string is attached by tension, and the air Based on the air supply line for supplying air to the spout, the air pressure gauge attached to the air supply line for detecting the air pressure of the supply air, and the air pressure detected by the air pressure gauge, A string hooking control device having a function of determining that the air outlet is closed by a string, the string is normally clamped, and the knot has two knots if the air pressure is equal to or greater than a predetermined value; The string knot inspection device according to (7) above, characterized by comprising:
(10) As the monitoring means, the presser pressure detector provided at the presser foot side at the holding position of the cord presser and the presser foot, and the presser pressure detected by the presser pressure detector being a predetermined value or more The string is properly clamped and the string hooking control device has a function of determining that the knot has two knots. Knot inspection device.
(11) A string knot inspection device provided in an automatic stringing machine that winds a string around an object to be bound, forms a knot and performs stringing, and includes a string presser that clamps and holds the string on the string end side A knot for a cord comprising a presser foot, and comprising a pulling force monitoring means for pulling out the cord foot and the cord on the side of the cord end sandwiched between the presser foot after forming the knot of the cord. Inspection device.
(12) The automatic stringer includes a cutter, a cutter lever that operates the cutter, and a cutter lever operating mechanism that operates the cutter via the cutter lever. A cutter groove for hooking and pulling the string on the string end side is formed. As the monitoring means, a cutter operating force detector provided in the cutter lever operating mechanism, and an operation detected by the cutter operating force detector. A string hooking control device having a function of determining that the pulling force is normal, the string is normally clamped, and the knot has two knots if the power is equal to or greater than a predetermined value; The string knot inspection device according to (11) above, wherein
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Based on the flow of FIG. 1, the knot forming process of the automatic strapping machine to which the present invention is applied will be described again, and an additional process related to the knot inspection of the present invention in the process will be described. In addition, the flow of FIG. 1 extracts only the process relevant to this invention. Moreover, in the following description, the same number is attached | subjected to the member same as the already demonstrated member.
[0012]
First, after completion of the previous stringing step, the string end 3a of the cut string 3 is pinched by the string presser 10 (110). Then, the string 3 is wound around the object 1 (120), and the winding end portion of the string 3 is hooked on the string presser 10 and wound (130). Next, the two cords 3 wound around the cord presser 10 are inserted into the beak 2 (140), and the two cords 3 are wound around the beak 2 while being rotated (150). Then, the string 3 is added to the beak 2 and the beak 2 is moved backward while the ring 3 is pressed against the beak 2 (160).
[0013]
In the series of steps described above, the string 3 held in the beak 2 is pulled through the ring, and the ring is pulled out of the beak 2 and tied. Then, the string 3 on the winding end side is cut with the knife 15 attached to the cutter 14, and at the same time, the string (string end 3a) with the end sandwiched between the string pressers 10 is hooked on the cutter groove 14a and pulled out ( 170) Finally, the string 3 attached to the beak 2 is released (180) to complete the double knot. Here, in the present invention, when the string on the string end 3a side is hooked on the cutter groove 14a and pulled out, the string sandwiched by the string presser 10, that is, the condition of the string on the string end 3a side is confirmed. (175) This makes it possible to determine that the string is normally clamped and the knot becomes a double knot.
[0014]
Hereinafter, based on the present invention, a preferred embodiment for monitoring the holding state of the string 3 by the string presser 10 and the presser base 11 will be specifically described.
(Embodiment 1)
In the present embodiment, as shown in FIG. 2, an air outlet 20 is formed in the presser base 11 and air is supplied from the connected air supply line 21. The air ejection port 20 is provided at a position where the string is clamped by the string presser 10 so that the air ejection port 20 is completely closed when the string is normally clamped.
[0015]
Thus, as a pre-process for pulling out the string on the string end side, the pressure of the air pressure gauge 22 connected to the air supply line 21 is monitored, and if the indicated value (air pressure) is equal to or greater than a predetermined value, the air outlet A process is performed in which 20 is closed by a string, the string is normally clamped, and the knot becomes a double knot. Such a process can be easily realized by using one function of a series of sequence processes performed by the tying control device 25 that controls the automatic tying machine.
[0016]
Here, if the spring pressure that holds the string 3 with the string retainer 10 is not appropriate, or if there is an abnormality such as the string scrape clogging the operating part of the string retainer 10, the air outlet 20 is completely blocked by the string 3. Since it does not come off and air leaks, the air pressure does not reach a predetermined value, and an abnormality can be easily detected.
By the way, when the string 3 is completely removed, the air spout 20 may be blocked by the string presser 10. For this reason, it is preferable to provide an air vent on the string presser 10 side.
[0017]
Further, instead of the air jet 20 shown in FIG. 2, as shown in FIG. 10, the presser base 11 on the path of the cord 3 sandwiched between the cord presser 10 and the presser base 11 and the cord 3 is attached by tension. The air outlet 20a may be formed at the upper position. Since the path of the string 3 is constant and is tensioned by being pulled by a beak which is not shown here, if the string end 3a of the string 3 is normally pressed by the string presser 10, this air jet Similarly, the outlet 20a is blocked, and the function of the present invention can be suitably realized.
(Embodiment 2)
As another method for monitoring the state in which the string 3 is clamped by the string presser 10 and the presser base 11, as shown in FIG. 3, the strap 3 is clamped between the string presser 10 and the presser base 11 and is held by the presser base. There is also a method in which a presser pressure detector 23 is provided on the 11 side, and if the presser pressure detected by the presser pressure detector 23 is equal to or greater than a predetermined value, the cord 3 is normally clamped and the knot is double knotted. Applicable. Here, as the presser pressure detector 23, a microswitch, a load cell, a strain gauge, or the like can be suitably applied.
[0018]
As shown in FIG. 3, it is needless to say that both of the presser pressure detector 23 and the air outlet 20 are provided, and both methods may be applied together, or any one of the methods may be applied. Yes. Further, although the presser pressure detector 23 and the air ejection port 20 may be provided on the string presser 10 side, the mechanism is complicated and is not preferable.
By the way, in order to check the pinching state of the cord 3, in addition to directly monitoring the holding state of the cord 3 by the cord presser 10 and the presser base 11 as described above, the cord 3 pinched by the cord presser 10 and the presser base 11 is used. You may make it comprise the process of monitoring the extraction force at the time of extracting.
[0019]
Hereinafter, a preferred embodiment of the present invention for monitoring the pulling force when the string 3 is pulled out will be specifically described.
(Embodiment 3)
In the third embodiment, as shown in FIG. 3, the cutter 14 is operated via the cutter lever 17, and the cutter lever 17 is operated when the string 3 is hooked and pulled out from the cutter groove 14 a formed in the cutter 14. The pulling force is monitored by a cutter operating force detector 24 provided in the cutter lever operating mechanism 18, and if the operating force detected by the cutter operating force detector 24 is equal to or greater than a predetermined value, the string 3 is normal. It is determined that the knot is pinched and the knot becomes two knots.
[0020]
That is, if there is an abnormality such as an inappropriate spring pressure for pressing the cord 3 or an occupant of the cord presser 10 being clogged with string waste, the cord 3 is easily pulled out when the cord 3 is pulled out, and a predetermined pulling force is obtained. Because it does not reach, an abnormality is detected.
Here, a force sensor is preferably applied as the cutter operating force detector 24. Specifically, a load cell, a strain gauge, or the like is preferably applied.
[0021]
【The invention's effect】
According to the present invention, it is possible to reliably perform the knot inspection of the automatic stringer, and it has been possible to eliminate the single knot trouble caused by poor maintenance or inspection which has been a big problem in the past.
[Brief description of the drawings]
FIG. 1 is a main part process flow diagram for explaining a knot inspection of the present invention in a knot forming process of an automatic stringer.
FIG. 2 is a schematic diagram showing a preferred embodiment for performing a knot inspection of the automatic strapping machine of the present invention.
FIG. 3 is a schematic diagram showing a configuration example of several detectors that perform knot inspection of the automatic strapping machine of the present invention.
FIG. 4 is a schematic diagram for explaining a state of tying a bundled object.
FIG. 5 is a schematic view showing a state in which a string is wound around a string presser.
FIG. 6 is a schematic view of a cutter table including a string presser and a cutter equipped with a knife.
7 is an essential part assembly diagram of the cutter base shown in FIG. 6. FIG.
FIG. 8 is a perspective view showing a normal string knot (two knots).
FIG. 9 is a perspective view showing an abnormal string knot (single knot).
FIG. 10 is a schematic view showing another preferred embodiment for performing a knot inspection of the automatic strapping machine of the present invention.
[Explanation of symbols]
1 Bundled material (article)
2 Beak (nodule peak)
3 String
3a String end
3b Knot 9 Cutter base
10 String presser
11 Presser foot
12 String presser spring
13 String presser lever
14 Cutter
14a Cutter groove
15 Knives
16 Knife presser
17 Cutter lever
18 Cutter lever operation mechanism
19 String presser lever operating mechanism
20, 20a Air outlet
21 Air supply line
22 Air pressure gauge
23 Presser foot pressure detector
24 Cutter operating force detector
25 Peg control device
31 Cutter shaft bolt
32, 34, 37 nut
33, 35 screw
36 Washer

Claims (12)

A method for inspecting a knot of a string in an automatic stringing machine that wraps a string around an object to be bound, forms a knot and performs a stringing,
After forming the knot of the string, as a pre-process for pulling out the string on the side of the string end sandwiched between the string presser and the presser foot, a step of monitoring the holding state of the cord by the presser foot and the presser foot is provided. The knot inspection method of the string characterized by this. The clamping state is monitored based on the air pressure of the air ejected from the air outlet formed at the holding position of the string clamped between the string presser and the presser foot and formed on the presser foot side, 2. The knot of a string according to claim 1, wherein if the air pressure is equal to or higher than a predetermined value, it is determined that the air outlet is closed by the string, the string is normally held, and the knot has two knots. Inspection method. The above-mentioned sandwiched state monitor was ejected from an air outlet formed on a path of the string sandwiched between the string presser and the presser foot and formed on a position on the presser foot where the string is attached by tension. It is performed based on the air pressure of the air, and if the air pressure is a predetermined value or more, it is determined that the air outlet is blocked by a string, the string is normally clamped, and the knot has two knots. The string knot inspection method according to claim 1. The clamp state is monitored by a presser pressure detector attached to the presser foot at the position where the cord clamped between the presser foot and the presser foot, and the presser pressure detected by the presser pressure detector is a predetermined value. If it is above, it will determine with a string being pinched normally and it will determine that a knot will be two knots, The knot test | inspection method of the string of Claim 1 characterized by the above-mentioned. A method for inspecting a knot of a string in an automatic stringing machine that wraps a string around an object to be bound, forms a knot and performs a stringing,
A method for inspecting a knot of a string, comprising: a step of monitoring a pulling force when the string end between the string presser and the presser base is pulled out after forming the knot of the string. When operating the cutter via the cutter lever and hooking the string on the end of the string into the cutter groove formed in the cutter, and pulling it out,
The pulling force is monitored by a cutter operating force detector provided in a cutter lever operating mechanism that operates the cutter lever, and if the operating force detected by the cutter operating force detector is equal to or greater than a predetermined value, the string 6. The method for inspecting a knot of a string according to claim 5, wherein the knot is normally clamped and the knot is determined to be a double knot. A string knot inspection device provided in an automatic stringing machine for wrapping a string around an object to be bound, forming a knot and performing stringing,
A string presser and a presser foot for holding and holding the string on the string end side are provided,
Monitor means for monitoring the string holding state of the string presser and the presser foot;
An apparatus for inspecting a knot of a string, characterized in that, after the knot of the string is formed, as a pre-process for pulling out the clamped string, the monitoring means monitors the clamping state of the string. As the monitoring means,
An air jetting port formed at the holding position of the string presser and the presser foot and formed on the presser foot side;
An air supply line for supplying air to the air outlet;
An air pressure gauge attached to the air supply line for detecting the air pressure of the supply air;
A function for determining that, based on the air pressure detected by the air pressure gauge, if the air pressure is equal to or greater than a predetermined value, the air outlet is blocked by a string, the string is normally held, and the knot is double-knotted. A stringing control device comprising:
The knot inspection device for a string according to claim 7, comprising: As the monitoring means,
An air outlet formed on a path of the string sandwiched between the string presser and the presser foot and formed at a position on the presser foot where the string is attached by tension; and
An air supply line for supplying air to the air outlet;
An air pressure gauge attached to the air supply line for detecting the air pressure of the supply air;
A function for determining that, based on the air pressure detected by the air pressure gauge, if the air pressure is equal to or greater than a predetermined value, the air outlet is blocked by a string, the string is normally held, and the knot is double-knotted. A stringing control device comprising:
The knot inspection device for a string according to claim 7, comprising: As the monitoring means,
A presser pressure detector attached to the presser foot at the holding position of the cord clamped between the presser foot and the presser foot;
If the presser pressure detected by the presser pressure detector is equal to or greater than a predetermined value, a string hooking control device having a function of determining that the string is normally clamped and the knot has two knots;
The knot inspection device for a string according to claim 7, comprising: A string knot inspection device provided in an automatic stringing machine for wrapping a string around an object to be bound, forming a knot and performing stringing,
A string presser and a presser foot for holding and holding the string on the string end side are provided,
An apparatus for inspecting a knot of a string, comprising: a pulling force monitoring means for pulling out the string on the string end side sandwiched between the string presser and the presser foot after forming the knot of the string. The automatic strapping machine includes a cutter, a cutter lever that operates the cutter, and a cutter lever operating mechanism that operates the cutter via the cutter lever. A cutter groove is formed to hook and pull the string on the side,
As the monitoring means,
A cutter operating force detector provided in the cutter lever operating mechanism;
If the operating force detected by the cutter operating force detector is equal to or greater than a predetermined value, the cord has a function of determining that the pulling force is normal and that the cord is normally clamped and the knot has two knots. A hanging control device;
12. The string knot inspection device according to claim 11, further comprising:

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