JPH07100205B2 - Defective winding detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a can body such as a coffee drink can, a juice can, a beer can or the like, or an empty can. To a device for detecting. In addition, in the present specification, a normal can body including a body portion and a bottom portion, that is, an empty can as well as a case body having no bottom portion is referred to as a can body.

[0002]

2. Description of the Related Art A conventional can body is defectively wound when double-tightening a lid portion or a bottom portion (referred to as an end wall in this specification), that is, from a specified range value of a can height. Deviation or a so-called false seam 51 (false sea) causing leakage of contents as shown in FIG.
In the case of m), the condition was first determined by manual inspection or by leaking the contents.
Therefore, the increase of production cost due to labor cost, omission of inspection,
There was also the problem of inviting complaints.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for automatically detecting a defective winding when double-winding an end wall on a can body by 100% inspection.

[0004]

Defect seamed detection device of the present invention SUMMARY OF] is CIMA <br/> comprising a plurality of lifter plates by placing the can body to be seamed to the end wall, revolve while rotating A defective winding detection device, which measures the gap width between the lifter plate and the position at which the lifter plate should reach the maximum level during the second winding, or immediately before that position. A first displacement sensor, and
The gap width detected by the first displacement sensor is defined as the first definition.
Cans that are outside the first specified range compared to the nodal value
A device that detects a defective height closed can: the can body is the second ticket clamp
Of the passing can body between immediately before and after the position to be
Measure the width of the gap with the body, which is placed close to the body.
And a second displacement sensor for
The detected gap width is compared with the second specified range value and the
Those outside the specified range value of 2 are detected as eccentric defective winding cans.
It is characterized in that it is provided with a device for taking out .

[0005]

In the seamer 2 , the can body 4 having the end wall 11 mounted thereon has the seaming chuck 1 at a constant level with the lifter plate 7a pushed up by the spring 13.
While being supported between the two , it revolves at the same time as the rotation,
The flange portion 4 and the curl portion of the end wall 11 are double-wound. And the like or hits another object during transport to reach the Cima 2, the flange portion is Ri is locally increased bending <br/> songs outwardly downwardly, the CIMA 2 in a state where the height is Tsu somewhat lower When tightening the sent can body, the lifter plate 7a is pushed up obliquely via the spring 13 at the bent portion of the flange, and the lift seam 51 is tightened in an oblique state so that the false seam 51 (see FIG. 10) is formed. Easy to grow.

In this case, the lifter plate 7a should be at the highest level at the position 15a (see FIG. 4 ) during the second winding .
Irradiation), or arranged immediately before the first displacement sensor 20 for measuring the gap width between the lifter plate upper surface 7b
The measured value according to is different from that when the lifter plate 7a is in the normal horizontal state. This measured value can be
The height of the lifter plate where body 4 is wrapped with a normal bear
The first prescribed range value determined based on
Those outside the specified range of 1 are considered as canned defective height canned cans.
It is equipped with a device to detect
The false seam cans that have been closed are inspected as cans with a defective can height.
Will be issued.

[0007] Even when the flange portion is normal, such as by a failure of the spring 13 during operation, the spring 1
Lifter plate 7a supported by 3 (paragraph number
The rising position of 0010 and FIG. 11 fluctuates, and the can height (can height is the highest level 15a at the time of the second tightening).
Upper surface 7b of the lifter plate above the cam surface of the
Although the winding roll (determined by the distance between the upper end of the flange of the winding roll [at a constant level]) may deviate from the first specified value range , a can having such a defect also has the same can height as described above. Detected as a defective can.

[0008] The production rate of the commercial Cima 2 is usually about 5
It is from 00 to 1500 cans, and therefore the revolution speed is very high. Therefore, a large centrifugal force acts on the can body 4 ,
4, the bottom end of the body slides, and as shown by the one-dot chain line in FIG.
4a is likely to be inclined. When the body 4a is tilted in this way,
False seams, even with normal flanges
Bad winding such as 51 is likely to occur. During the can body 4 just before and just after the position to be second seaming, torso 4 of the can 4 to pass
disposed proximate to a, the second displacement sensor 17a for measuring the gap width of the trunk portion 4a, 17b, 17c, 1
Each gap width measured by 7d is proportional to the degree of inclination of the can body 4 . Gap width detected by the second displacement sensor
The second rule based on the can body 4 that is upright
Compared with the range value, those that are outside the second specified range value are biased.
Since it is equipped with a device to detect a defective core winding can,
If the gap width is outside the second specified nodal value, the eccentricity is bad.
Detected as a closed can . The first displacement sensor and the second
Measurement of gap width by the displacement sensor, since the automatically performed on the can of the total number can be automatically detected by total inspection defective seaming.

[0009]

[Example] In FIGS. 1 and 2 showing a double winding device,
Reference numeral 1 is an inlet turret, 2 is a seamer, 3 is an outlet turret, and 4 is a can body whose end wall 11 (FIG. 3) is to be wound. The seamer 2 includes a transport turret 6, a plurality of (normally 6 to 12, eight in this embodiment) lifters 7, a first winding roll 8, a second winding roll 9 and a sheet which are circumferentially provided at equal intervals. The ming chuck 12 (see FIG. 3) is provided.

[0010] The lifter 7 is a schematic diagram of FIG.
For example, place the can body 4 on top as shown in the detailed view of FIG.
Lifter plate 7a for lifting, lifter plate 7a
Equipped with a spindle 7c fixed to the lower center of
Plunger 6 through ball bearing 61 and roller bearing 62
It is attached so as to be rotatable with respect to zero. Plunger 60
The upper part of the spindle 7c, the ball bearing 61, etc.
It is a hole 60b for storing, and the hole 60b
An annular hole for accommodating the lower part of the spring 13 below
60a is formed. The upper part of the spring 13 is
Through the flange portion 63a of the pulling guide member 63, the ball shaft
It is in contact with the outer ring 61 a of the receiver 61. Within the annular hole 60a
Side of the plunger circular portion 60c on the side and the spring guide portion
The lower surface of the material 63 is slightly separated, and the gap 69 is formed between them.
is made of. At the bottom of the plunger 60, the circumference of the pin 66
Rotating through the needle bearing 64, and the circumferential cam 67
(Hereinafter referred to as lifter cam) cam roll 65 engaged with
Has been installed. 68 is the plunger 60 that moves up and down
Busting to guide. Spring 13 is always
It is a bear that has stretched out, but when it is tightened it shrinks and becomes a can body 4.
Pressing force can be applied. Cam roll 65
Plunger 60, spring 13, and sp
Ring guide member 63, outer ring 61a of ball bearing, ball bearing 61
And the lifter plate 7a via the spindle 7c
Ascends and pushes the can body 4 up in the axial direction, at a constant level
Spring 13 between seaming chuck 12
The winding is performed under the pressing force. It's clear from Figure 11.
As shown, the lifter plate 7a is tilted together with the spring 13.
It has an easy-to-use structure.

FIG. 4 shows an example of a cam curve when the starting point of the revolution of the lifter cam 67 is the position B in FIG. 1, that is, when the revolution angle at the position B is 0 degree. The lifter plate 7a has a revolution angle of about 340 to 3
It rises sharply at a position between 0 degrees (the rising height is about 3
0 mm), it slightly rises linearly between about 30 to 220 degrees, reaches the maximum level at the position 15a at the revolution angle of 223 degrees, and then sharply decreases and returns to the original level. ing. And the can body 4 has a revolution angle of 59 degrees (position 14).
And 142 degrees (position 15), ie the radius o in FIG.
During the passage between x and the radius oy the first tightening is carried out and during the passage between positions 15 and 15a, ie between the radii oy and oz of FIG. A winding part is formed. The height difference between the position 14 and the position 15a is, for example, 0.66 mm, which is extremely small.

As shown in FIG. 1, the can body 4 enters the pocket 1 a of the feeding turret 1 and is conveyed along the inlet side guide surface 5 a of the guide plate 5 in the direction of arrow A, and then at the position B. , The axis of the can body 4 passes through a plane connecting the axis of the feeding turret 1 and the axis of the seamer 2,
After moving to the pocket 6a of the transport turret 6 and immediately capping the end wall 11, as shown in FIG. 3, the seaming chuck 12 and the lifter plate 7a are gripped by the lifting lifter plate 7a, and the arrow C After the end wall 11 is fastened as described above while rotating in the same direction and rotating on its own, it moves to the pocket 3a of the delivery turret 3 which rotates in the direction of arrow D, and follows the outlet side guide surface 5b of the guide plate 5. Are conveyed to the next process.

As shown in FIG. 1, the region where the secondary winding is performed (between the radius oy and oz) and immediately before that (preferably, the difference from the revolution angle of the radius oy is about 10 degrees or less; Is a plurality of (preferably 3 or more; equidistant from the central axis o of the seamer 2 and at equal intervals along the difference between the revolution angle of the radius oy and the revolution angle is preferably about 10 degrees or less). Displacement sensors 17a, 17b, 17c, and 17d for eccentricity detection (for example, magnetic sensors) are provided. The distance between the adjacent displacement sensors 17 is
It is set so that the can body 4 rotates 1/4 times while passing the front surface thereof. Therefore, the can body 4 of each pocket 6a has four displacement sensors 17a, 17b, 17c, 17
When passing in front of d, the center angle in the circumferential direction of the body 4a is 90
The gap width between each of the displacement sensors 17 and the portions that are gradually separated is detected. When there are three displacement sensors 17, the distance is
It is defined that the can body 4 rotates 1.1 / 3 times while passing the front surface thereof.

Further, as shown in FIGS. 2 and 3, the displacement sensor 17 faces the lower portion of the body portion 4a of the can body 4 (for example, at a position about 20 mm above the upper surface 7b of the lifter plate), and is disposed in a positive position. It is fixed to the fixed frame 18 via a fixture 19 at an extremely short distance from the standing can body 4, for example, at a position where the gap width d1 is about 2 mm. Therefore, when the body portion 4a is wound in a slanted state, one of the four displacement sensors has a large gap width with the body portion, and one of them has a short gap width. This difference is compared with the normal value d1, and the specified range values (d1-α) to (d1 + α) {α
Is, for example, a deviation from 0.2 mm} is eccentric winding failure
Detect as a can .

As shown in FIGS. 1 and 3, the circumferential position where the lifter plate 7a for the second winding reaches the highest level (position 15a in FIG. 4 or position on the radius oz in FIG. 1). Immediately before (preferably the difference of the revolution angle from the radius oz is about
A displacement sensor 20 for can height detection is arranged above the lifter plate 7a at a position of 30 degrees or less).
The displacement sensor 20 is located very slightly above the lifter plate 7a near the highest level, for example, the gap width d2 is about
It is fixed to the fixed frame 18 via the fixture 16 at a level of 1.5 to 1.6 mm. Again, the gap width is defined range values (d2-β) ~ (d2 + β) {β is for example 0.2 mm} that deviates from detects as a can height defective seamed can.

It is preferable to know in what of the lifter plates 7a the defective winding is caused in the can body 4 placed on the lifter plate 7a, that is, in which pocket of the transporter lento 6 of the seamer. Therefore, one protrusion 21 is provided along the longitudinal direction of the drive shaft 3b of the delivery turret 3.
There are five timing cams 21 (FIG. 5) having x (21
a, 21b, 21c, 21d, 21e; see FIG. 7), and a timing cam 22 having eight protrusions 22x.
5 (FIG. 6) (22a, 22b, 22c, 22d, 2
2e; see FIG. 7). The delivery turret 3 rotates in synchronism with the seamer 2, and one rotation of the seamer 2 also makes one rotation of the delivery turretnot 3 and the number of pockets of both is the same.
It has a function equivalent to that of the two drive shafts 2a.

In proximity to each timing cam 21, the reference pocket of the seamer 2 (hereinafter referred to as “No. 1 pocket”, and the pockets on the downstream side thereof are sequentially No. 2, No. 3, ...
No.) for detecting each number. 1-pocket detection sensor 23 (for example, a proximity switch; 23a, 23a
b, 23c, 23d, 23e; see FIG. 7), and is configured to output an ON signal (pulse) when the protrusion 21x passes over its entire surface. The pocket-specific detection sensor 24 (2
4a, 24b, 24c, 24d, 24e; see FIG. 7 are arranged, and are configured to output an ON signal (pulse) each time each of the eight projecting portions 22x passes its front surface. In FIG. 8 described later, the pulses 34a, 34b,
34c, 34d, 34e, 34f, 34g, and 34h are pocket Nos. 1, No. 2, No. 3, N
o. 4, No. 5, No. 6, No. 7, No. This is a pulse corresponding to 8.

FIG. 7 shows a circuit for detecting defective winding based on the output signal of each sensor. 25 is a block diagram of a circuit corresponding to the eccentricity detection displacement sensor 17a, and 21a and 22a are timing cams 21 and 22 corresponding to the displacement sensor 17a, respectively. Reference numeral 26 is an amplifier, 27 is a peak hold circuit, 28 is an A / D converter, 29 is a counter, and 30 is a differentiating circuit.

In FIG. 8 showing a timing chart of the operation of the circuit 25, 31 indicates an output signal of the eccentricity detection displacement sensor 17 a amplified by the amplifier 26. 31
a, 31b, 31c, 31d, 31e, 31f, 31g
No. 31h and No. 31h, respectively. 1, No. 2, No.
3, No. 4, No. 5, No. 6, No. 7 and N
o. The waveform signal when the 8-pocket can body 4 passes the front surface of the displacement sensor 17a (t3 is the transit time) is shown. Taking the signal 31a as an example, the waveform bottom value 31a1 is peak-held by the peak-hold circuit 27.

No. 33 is No. 1-pocket detection sensor 23
This is a pulse signal output from a, and one is output each time the seamer 2 makes one rotation. 34 is a pulse signal output from the pocket-specific detection sensor 24a, and the seamer 2 is 1
Eight is output each time it rotates. The timing cam 22 is
It is attached to the drive shaft 3b so that the pulse signal 34 is located substantially in the middle of the adjacent waveform signals 31, for example, between the waveforms 31g and 31h. Further, the timing cam 21 is No. Waveform signal 3 based on one-pocket can 4
It is attached to the drive shaft 3b so that the pulse signal 33 is output immediately before the pulse signal 34a issued before the output of 1a is output. The counter circuit 29 is reset at the rise of the pulse signal 33, and the count value becomes zero.

The displacement sensor 17a has an arbitrary pocket 6a.
When the can body 4 approaches, the pulse signal 34 is output from the pocket-specific detection sensor 24 a and is input to the differentiating circuit 30.
Immediately from the differentiating circuit 30, a pulse 3 having an extremely narrow width (for example, a minimum width of 2 m · sec) based on the trailing edge of the pulse signal 34 is generated.
5 is input to the counter circuit 29 and the peak hold circuit 27. The peak hold circuit 27 is reset by the pulse 35, and starts holding the bottom value (for example, 31a1) of the waveform signal 31. At the same time, the counter circuit 29 increments the count value by 1 (for example, if the previous value is 1, it becomes 2).

The can body 4 in the next pocket is the displacement sensor 17
When the pulse 34 is output from the sensor 24a when approaching a, the differentiating circuit 30 rises and the differentiating pulse 36 is input to the peak hold circuit 27 and the A / D conversion circuit 28, and the peak hold up to that point is completed. The / D conversion circuit 28 is turned on. That is, the time t1 becomes the peak hold time. The held bottom value is A at the same time.
It is input to the / D conversion circuit 28 and conversion into a digital value is started. When the conversion is completed (this processing is executed during the time t2), the A / D conversion circuit 28 outputs the signal indicating the end of one pocket detection, its detection value and its count value latched by the counter circuit 29. (Pocket number)
The data is output to the microcomputer 38 which is a data discriminating device.

The microcomputer 38 displays the detected value and the pocket number. And the specified range value (d1
-Α) to (d1 + α) and (d2-β) to (d2 +
Compared with β), determination of whether the tightening is good or bad and various data processing (for example, statistical processing) are performed. When it is detected that defective winding has occurred in any of the pockets, an alarm generation signal 48 is issued to an alarm device (not shown) and an operation stop signal 50 is issued.

Reference numerals 39, 40 and 41 are block diagrams of circuits corresponding to the eccentricity detection displacement sensors 17b, 17c and 17d, respectively, and the arrangement positions thereof are different, so that the timing charts are out of phase. except,
It has the same configuration and operation as the circuit 25.

Reference numeral 42 is a block diagram of a circuit corresponding to the displacement sensor 20 for can height detection, and 43 is an amplifier, 4
4 is a peak hold circuit, 45 is an A / D conversion circuit, 46
Is a counter, 47 is a differentiating circuit, and FIG. 9 is a timing chart thereof. In FIG. 9, reference numeral 51 denotes a can height detecting displacement sensor 20 amplified by the amplifier 43.
Of the output signal of No. 53. 1 pocket sensor 2
3e, 54 is a pulse signal output from the pocket-specific detection sensor 24e, and 55 and 56 are poles output from the differentiating circuit 47 based on the fall and rise of the pulse signal 54, respectively. It is a narrow pulse signal and operates in the same manner as the circuit 25. Note that at t3, the lifter plate 7a is displaced by the displacement sensor 2
The time for passing below 0 is shown, and slight unevenness is observed during that time because there is a minute recess 7b1 due to a mounting screw on the upper surface 7b of the lifter plate (see FIG. 3). 51a is the bottom value.

As described above, the processing by the circuit shown in FIG. 7 is repeatedly performed, and the detected value, the pocket number. Are processed one after another, and 100% inspection of the can body winding is performed.

The present invention is not limited to the above embodiments, and for example, a can height detecting displacement sensor is
The lifter plate may be arranged at a position where the highest level should be obtained.

[0028]

EFFECTS OF THE INVENTION The present invention has an effect that it is possible to automatically detect a defective winding when the end wall is double-wound around the can body by 100% inspection.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of an example of a double winding device to which a defective winding detection device of the present invention is attached.

FIG. 2 is a front view of a main part of the double winding device of FIG.

FIG. 3 is a partially cut front view for explaining an essential part showing a state in which double winding is performed in the present invention.

FIG. 4 is a diagram showing an example of a profile of a cam surface for moving a lifter plate up and down.

FIG. 5 is a plan view of an example of a first type timing cam used in a hardware device that processes the output of a displacement sensor.

FIG. 6 is a plan view of an example of a second type timing cam used in a hardware device that processes the output of a displacement sensor.

FIG. 7 is a block diagram of a circuit that processes the output of the displacement sensor.

FIG. 8 is an example of a timing chart of a circuit that processes the output of the displacement sensor for eccentricity detection in FIG.

9 is an example of a timing chart of a circuit that processes the output of the displacement sensor for can height detection in FIG.

FIG. 10 is a longitudinal sectional view of an essential part showing an example of defective winding.

FIG. 11 is a vertical sectional view showing details of an example of the structure of the lifter.
Is.

[Explanation of reference numerals] 2 seamer 4 can body 4a body 7a lifter plate 7b lifter plate upper surface 11 end wall 15a highest level 17a eccentricity detection displacement sensor (second displacement sensor) 17b eccentricity detection displacement sensor (first 2 displacement sensor) 17c eccentricity detecting displacement sensor (second displacement sensor) 17d eccentricity detecting the displacement sensor (second displacement sensor) 20 cans height detecting displacement sensor (first displacement sensor
25 ) Circuit corresponding to displacement sensor for eccentricity detection (no eccentricity)
Yomaki clamping cans and then detected device) 38 microcomputer (can height defective Makishimekan,
A device that detects as an eccentric defective winding can. 42 Same path (cans) corresponding to a displacement sensor for can height detection.
Device for detecting as a defective height canned can.)

Claims (1)

[Claims] 1. A can body to be wound around an end wall is placed,
Equipped with multiple lifter plates that revolve while rotating
A device for detecting defective winding provided on a seamer , the device including a gap width between an upper surface of a lifter plate and a position at which the lifter plate should reach a maximum level during the second winding. A first displacement sensor for measuring,
And the gap width detected by the first displacement sensor
Is outside the first specified range value, compared to the specified
Apparatus for detecting the as a can height defective seaming the can: a can body first
2 Pass between immediately before and immediately after the position where it should be tightened
Measure the width of the gap between the body and the body, which is placed close to the body of the can.
Second displacement sensor for determining
The gap width detected by the sensor is compared with the second specified range value.
And those outside the second specified nodal value as eccentric defective winding cans.
A defective winding detection device, which is provided with a device for detecting.