JPH0738103Y2 - Automatic adjustment device for the defective stitch detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention detects a defect and outputs a signal when the edge of the opening provided at the upper end of the bag is sewn by a sewing machine. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defective stitch sewing detection device, and more particularly to an automatic adjustment device thereof.

<Prior Art> Conventionally, in the automatic small-scale packaging of powdery products, powdery products and the like, bags such as kraft paper are often used for bagging. Then, at that time, after the product is put into the bag body through the opening provided at the upper end of the bag body and filled, the edge of the opening at the upper end is covered by folding a reinforcing paper such as crepe paper in two,
A method in which the sewing machine is hooked with a sewing machine in the state of being piled up and stitched is used.

However, the height of the bag is not always constant due to the filling condition of the product (contents) put in the bag, and therefore the distance between the seam line of the sewing machine hook and the upper end of the opening edge (seam margin). May slightly change depending on the bag body, and the seam allowance of the bag body may become shallow, so-called shallow sewing may occur.

When such shallow sewing occurs, when the bag body is overturned, the contents may overflow or may be damaged during transportation.

Further, depending on the shape of the bag body when the contents are loaded, there is a possibility that the seams may not be applied to the bag body at all.

Therefore, it is necessary to detect defective products such as shallow sewing. However, as described above, since the edge of the opening of the bag is covered with the reinforcing paper and the sewing machine is hung on the reinforcing paper, it cannot be judged from the appearance whether or not the proper seam allowance is secured.

Therefore, the applicant of the present invention provided a light emitting device and a light receiving device at a predetermined height position slightly above the position of the seam line so as to face each other with the bag body sandwiched therebetween, and the light receiving device when the bag body passes between them. If the amount of received light is above a set level, it is proposed that there is no bag and only the reinforcing paper is given, and a defective signal is output (Japanese Patent Application No. 63-35196).

<Problems to be solved by the invention> However, in the case of such a hook-and-loop sewing defect detection device, it is necessary to adjust the sensitivity each time according to the difference in the transmission amount depending on the color and type of the reinforcing paper. There are times when you make an erroneous decision due to forgetting or misadjusting, etc.
There was room for improvement.

That is, for example, when the reinforcing paper is white or yellow, the transparency is relatively good, so that even if the seam allowance is normal, the amount of light received by the light receiver becomes equal to or higher than a predetermined level, and a defective signal is generated. If the reinforcing paper is red or green, etc., on the contrary, the transparency is poor, so even if it is a bag with shallow stitches, the amount of light received by the light receiver does not reach the predetermined level. Therefore, it is possible that no defective signal is issued.

In view of such a point, the present invention aims to provide an automatic adjusting device for a defective stitch sewing detection device capable of automatically adjusting the optimum sensitivity and making an accurate determination regardless of the color and type of the reinforcing paper. And

<Means for Solving the Problem> In order to achieve the above object, in the present invention, a bag in which the edge of the opening provided at the upper end of the bag is covered with a reinforcing paper, and the bag is sewn from above with a sewing machine. A light emitter and a light receiver are provided to face each other at a predetermined position slightly above the position of the seam line with the body sandwiched between them, and when the amount of light transmission is detected and the amount of transmission is above a predetermined level, A perforation amount determining means for determining the permeation amount when only the reinforcing paper is provided, and a permeation amount of the reinforcing paper itself by the permeation amount determining means, as well as having a sewn stitch defect detection device that determines that only the reinforcing paper is output When it is determined that the number of defects is small, sensitivity changing means for increasing the sensitivity of the insole sewing detection device is provided.

<Operation> According to the above configuration, the sensitivity of the defective stitching detection device can be automatically changed according to the amount of penetration of the reinforcing paper itself. If the amount of transmitted light is relatively high, the sensitivity will remain relatively low, and if the amount of transmitted light such as red or green is low, the sensitivity will be changed from low to high. It is possible to accurately detect a defective stitch.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 to 5, but the present invention is not limited to the following example unless the gist thereof is exceeded.

With reference to FIG. 3, the bag 1 made of kraft paper is filled with the product weighed by a product weighing unit (not shown).
At, the hopper 3 feeds in through the upper opening. After that, the sewing machine hooking and introducing device 4 keeps the opening end edge 1a of the bag 1 from being opened, and while being conveyed by the conveyer 5, the bag 1 is guided to the sewing machine device 6 which is fixed during conveyance.

At this time, the reinforcing paper 9 such as crepe paper, which is supplied from the roll-shaped reinforcing paper supply unit 7 and is folded in half by the guide 8 having an inverted U-shaped cross section, is used when the front bag 1 is sewn. When the bag 1 is detected by a sensor (not shown) that is waiting in the state where the sewing machine is partially hooked, the sewing machine 6 is activated and the opening edge 1a of the bag 1 is sandwiched by the reinforcing paper 9. Cover it, hang it on the sewing machine and sew.

When the completion of the stitch sewing is detected by the sensor (not shown) due to the passage of the bag body 1, the sewing machine device 6 stops and the reinforcing paper 9
Is cut by a cutter (not shown).

The bag 1 that has completed the stitch sewing is covered with the reinforcing paper 9, and it is determined by the next stitch sewing failure detection device whether or not the seam allowance of the opening edge 1a on which the sewing machine is hung is appropriate. .

As a first embodiment, the defective stitching detection device includes a first sensor 11 and a second sensor 12, as shown in FIG.

The first sensor 11 is an infrared-transmissive type, the opening edge 1a is covered by the reinforcing paper 9, and the light emitter 11a is provided at a predetermined position slightly above the position of the seam line L of the bag 1 which is sewn. And the light receiver 11b are provided so as to face each other with the bag body 1 interposed therebetween.

The second sensor 12 is of a reflective type and is provided below the light emitter 11a of the first sensor 11 at a predetermined height position where the reinforcing paper 9 is not detected.

Referring to FIG. 1, the first sensor 11 is connected to a first controller 14 having a first sensitivity adjuster 13 attached thereto. The first controller 14 supplies electric power to the light emitter 11a, amplifies and inputs an electric signal corresponding to the amount of light received by the light receiver 11b, and the resistance in the first sensitivity adjuster 13 whose light reception amount is selected as described later. 13
Compared with a predetermined level based on a or the resistance 13b, the switch 14a on the output side is turned on when the amount of received light is equal to or higher than the predetermined level. Here, the first sensitivity adjuster 13 is adjusted so that the output side switch 14a is turned on when only the reinforcing paper 9 is used.

The second sensor 12 is connected to a similar second controller 16 with a second sensitivity adjuster 15. Second controller
Reference numeral 16 compares the amount of light received by the second sensor 12 with a predetermined level based on the resistance in the second sensitivity adjuster 15, and turns on the switch 16a on the output side when the amount of received light is equal to or higher than the predetermined level. Here, the second sensitivity adjuster 15 is adjusted so that the bag 1 is detected and the output side switch 16a is turned on.

The switch 14a on the output side of the first controller 14,
The switch 16a on the output side of the second controller 16 is connected to the third controller 17 together. The third controller 17 is connected to the alarm buzzer 18 and has a switch
When both the switch 14a and the switch 16a are turned on, the switch 18a of the alarm buzzer 18 is turned on.

The third controller 17 includes a low-sensitivity switch 17a that is turned on to select the resistor 13a of the first sensitivity adjuster 13 when the reinforcing paper 9 has relatively good transparency, and a reinforcement having relatively poor transparency. In order to select the resistor 13b of the first sensitivity adjuster 13 when the paper 9 is used, a high sensitivity switch 17b that is turned on instead of the low sensitivity switch 17a is built in, whereby the sensitivity of the first controller 14 is switched. It is designed to be used.

This is to automatically cope with the difference in the transmittance of the reinforcing paper 9 depending on the color and type of the reinforcing paper 9.

In addition, the low sensitivity switch 17a is always on,
When both the switch 14a and the switch 16a are turned off, the high sensitivity switch 17b is turned on.

Here, the third controller 17 corresponds to a transmission amount determining means for determining the transmission amount when only the reinforcing paper is provided, and the switches 17a and 17b on the output side of the third controller 17 and the first sensitivity adjuster 13 are transparent. It corresponds to sensitivity varying means for increasing the sensitivity of the defective stitch sewing detection device when the quantity determining means determines that the amount of transmission of the reinforcing paper itself is small.

Next, the operation of the defective stitch sewing detection device and the automatic adjustment device thereof will be described.

The upper part of the bag body 1 that has been sewn by the sewing machine 6 is the first
Although it reaches the sensor 11, only the reinforcing paper 9 without the bag 1 sewn first arrives (see FIG. 4). At this time, the second sensor 12 has not yet detected the bag body 1, and the switch 16a is off. At this time, if the reinforcing paper 9 is, for example, white or yellow, the transmittance of infrared rays from the light emitting device 11a is good, the amount of light received by the light receiving device 11b is large, and the switch 14a remains on and is a low sensitivity switch. 17a also remains on. Therefore, the sensitivity remains low.

The switch 14a of the first controller 14 is turned on, which corresponds to a shallow sewing detection signal.
Since 12 does not detect the bag body 1, the switch 16a of the second controller 16 is not turned on, and therefore the third controller 1
In 7, it is not judged as shallow sewing, and the switch 18a of the alarm buzzer 18
Does not turn on and no alarm is issued (section A in FIG. 2).

Next, when the bag body 1 arrives, the second sensor 12 detects the bag body 1 and the switch 16a is turned on.
If the back stitch is properly sewn, the light receiver 11b of the first sensor 11 is blocked by the bag 1 from the infrared light from the light emitter 11a, cannot receive light of a predetermined level or more, and the switch 14a is not turned on. The third controller 17 does not determine that the sewing is shallow sewing, the switch 18a remains off, and no alarm is issued (section B in FIG. 2).

However, if the seam allowance is small and the height of the upper end of the bag body 1 is low, the infrared rays are less obstructed and the amount of light received by the light receiver 11b becomes equal to or higher than a predetermined level.
Determines that only the reinforcing paper 9 is present, the switch 14a is turned on and outputs a shallow sewing detection signal to the third controller 17, and the third controller 17 also determines that shallow sewing is performed because the switch 16a is also on (the 2) C), alarm buzzer 18 switch
Turn on 18a and give an alarm.

Next, when the transmittance of the reinforcing paper 9 is poor, for example, when the reinforcing paper 9 is red or green, when only the end of the reinforcing paper 9 reaches the first sensor 11, that is, the second sensor When the sensor 12 is not detecting the bag 1 and the switch 16a is off, the light receiver 11b of the first sensor 11 cannot receive infrared rays at a predetermined level or more and the switch 14a is also off (D in FIG. 2). Therefore, the third controller 17 closes the high-sensitivity switch 17b instead of the low-sensitivity switch 17a which has been closed so far.

As a result, the first sensitivity adjuster 13 causes the resistors 13a to 13b to
When the predetermined level is changed to a lower value, the sensitivity of the first controller 14 is increased, and the light receiving amount 11b of the first sensor 11 is equal to or higher than the lower predetermined level. If it is determined that the switch 14a is turned on (section E in FIG. 2).

This increased sensitivity state is such that when the second sensor 12 is not operating, that is, when the bag body 1 has not yet reached, it is held for a specified extremely short time, and the second sensor 12 is operating. The sensitivity cannot be switched while the bag 1 is passing, that is, while the bag 1 is passing.

Therefore, the switch 16a of the second controller 16 is ON,
If the sewn stitch is normal, the switch 14a of the first controller 14 does not turn on (section F in FIG. 2), and if it is not normal, the first sensor 11 turns on (section G in FIG. 2) and an alarm is issued. Buzzer 18 sounds.

When the bag 1 passes, the first
In order to eliminate false alarms generated by the timings of the operations of the sensor 11 and the second sensor 12, the third controller 17 has a timer function so that the alarm is not issued in the state considered to be shallow sewing that occurs for an extremely short time. (Fig. 2
H, I, J, K points).

Further, the alarm buzzer 18 starts to sound when the shallow sewing occurs, and continues to sound for a predetermined time after the end of the shallow sewing (section L in FIG. 2).

Further, when the bag 1 has finished passing and the second sensor 12 is turned off, the sensitivity returns to low after a predetermined time has elapsed.

Next, a second embodiment will be described.

As a sensitivity switching method, as shown in FIG. 5, there is a method in which a plurality of sets of transmission-type first sensors 21 with built-in amplifiers are installed and the output to be used is selected according to the transmittance of the reinforcing paper 9. In this case, for example, in the case of two-stage switching, the sensitivity adjuster (not shown) attached to the controller 22 is adjusted so that one becomes the low-sensitivity sensor 21a and the other becomes the high-sensitivity sensor 21b.

In addition, a second sensor 23, a controller 22 connected to these, a warning buzzer 24 connected to the controller 22.
There is.

The operation is as shown below.

When the reinforcing paper 9 has not reached the first sensor 21, both the low sensitivity sensor 21a and the high sensitivity sensor 21b are in the ON state,
The controller 22 normally takes in the signal of the low-sensitivity sensor 21a. When the reinforcing paper 9 has good transparency, it is not necessary to switch the sensitivity as it is, but in the state where the second sensor 23 does not detect the bag body 1, the reinforcing paper 9 having poor transparency arrives, When the low sensitivity sensor 21a is turned off,
The controller 22 switches to receive the signal of the high sensitivity sensor 21b. This state is held for a very short time by the timer mechanism until the second sensor 23 detects the bag body 1, but when the second sensor 23 is turned on, it is accepted even if the first sensor 21b does not operate. The signal does not switch, so
Operates as the original device for detecting defective stitch sewing. And
When the second sensor 23 does not operate and a predetermined time has elapsed, the second sensor 23 is switched to the low sensitivity sensor 21a.

Here, the controller 22 corresponds to the transmission amount determining means and the sensitivity varying means.

In this embodiment, the sensitivity is switched between the high and low two-stage types, but the number of stages can be changed according to the transmittance of the reinforcing paper 9. In this case, when the bag 1 is not detected, the sensitivity is set to the minimum, and when only the reinforcing paper 9 passes, the shallow sewing is detected, that is, the contact 14a is closed.
The sensitivity adjuster 13 may be sequentially switched to a, b, c, d. Further, the second sensors 12, 23 are of a reflection type, that is, a light emitting device and a light receiving device are integrated, and the light from the light emitting device is reflected by the bag body, and the light receiving amount is detected by the light receiving device. Although the system type is used, a transmissive type similar to the first sensors 11 and 21 may be used, or another type may be separately adopted.

Further, although the alarm buzzers 18 and 24 are used, it is needless to say that the alarm buzzers are not limited to this and various alarm devices such as a lamp may be used.

Further, in order to automate and unmanner the work, it is desirable to use an apparatus for automatically detecting the bag with the defective stitch sewing using a signal for detecting the defective stitch sewing, and a device for automatically discharging it from the system.

<Effect of the Invention> As described above, according to the present invention, it is possible to easily detect a shallow sewing state which is covered with the reinforcing paper and cannot be visually discerned. Since it is possible to automatically adjust the sensitivity according to the difference in transmission amount due to the difference, it is not necessary to adjust the sensitivity each time, and there is no risk of making an erroneous judgment due to forgetting the adjustment or making an erroneous adjustment. The effect of the present invention is great, and the industrial utility value is extremely great.

[Brief description of drawings]

FIG. 1 is a system diagram of a defective stitch sewing detection device with an automatic adjusting device showing a first embodiment of the present invention, FIG. 2 is a time chart for detecting shallow stitching, and FIG. 3 is an overall view of the automatic stitch sewing device. 4 is a partially enlarged view of the defective stitch sewing detection device in FIG. 3, and FIG. 5 is a system diagram of the defective stitch sewing detection device with an automatic adjusting device according to the second embodiment. DESCRIPTION OF SYMBOLS 1 ... Bag body, 1a ... Opening edge, 6 ... Sewing machine device, 9 ... Reinforcing paper, 11 ... 1st sensor, 11a ... Light emitter, 11b ... Light receiver, 12 ...
2nd sensor, 13 ... 1st sensitivity adjuster, 14 ... 1st controller, 14a ... Switch, 16 ... 2nd controller, 16a ... Switch, 17 ... 3rd controller, 17a ... Low sensitivity switch, 1
7b ... High sensitivity switch, 18 ... Alarm buzzer, 18a ... Switch, 21 ... First sensor, 22 ... Controller, 23 ... Second sensor, 24 ... Alarm buzzer

Claims (1)

[Scope of utility model registration request] 1. A predetermined position slightly above the position of the seam line in which the edge of the opening provided at the upper end of the bag is covered with a reinforcing paper, and the bag sewn by a sewing machine is sandwiched therebetween. A light emitting device and a light receiving device are provided facing each other at a position, and when the amount of transmitted light is sensed and the amount of transmitted light is above a predetermined level, it is judged as reinforcing paper only and a defective signal is output. With the detection device, the transmission amount determination means for determining the transmission amount when only the reinforcing paper is provided, and the perforated stitch defect detection device when the transmission amount determination means determines that the transmission amount of the reinforcing paper itself is small. An automatic adjusting device for a defective stitch sewing detection device, comprising: sensitivity changing means for increasing sensitivity.