JPH0488975A - Apparatus for detecting positional deviation of transported material piece - Google Patents

Abstract

PURPOSE:To detect the deviation of the position of a tip paper piece relative to the drum surface of a suction roller by detecting whether at least a part of suction hole among plural suction holes on a transfer face is not closed with a sheet material. CONSTITUTION:Plural suction ports 40b... sucking a sheet material (p) are opened on a suction roll 40 in a region slightly smaller than the outer circumference of the material (p). When the material (p) is sucked at a position deviated relative to a transfer face, at least a part of the suction hole is not closed with the material piece (p) to lower the suction pressure. The drop of the suction pressure is detected by a pressure sensor 2 and the deviation of the position is judged by comparing the pressure with a preset value.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for detecting positional deviation during the conveyance process of a piece of chipping paper used to wind up double-cut tobacco and a filter plug in the cigarette manufacturing process. The present invention relates to a device for detecting positional deviation of conveyed material pieces.

[Conventional technology]

Conventionally, filter cigarettes are produced by gluing two double-cut cigarettes cut to a certain size and a filter plug, rolling them up with a piece of tip paper cut into a rectangular shape, and then cutting the filter plug in the middle. Two pieces are formed.

FIG. 8 is a diagram showing a portion of a conventional filter tip attachment machine of a cigarette manufacturing apparatus that supplies tip paper pieces. The tip paper bobbin 10 is loaded with a roll of strip-shaped tip paper, and the tip paper P is fed out from the tip paper bobbin 10 to the gluing section 30 by the feeding roller 20. The glue is transferred to one side and supplied to a drum-shaped suction roller 40 that rotates at a constant speed.

At this time, the non-glued surface of the tip paper P is brought into contact with the drum surface of the suction roller 40.

A cork knife 50 having a plurality of impeller-shaped incisors is disposed near the outer periphery of the suction roller 40, and as shown in FIG. Chip paper P is cut on 40a. Note that the rotational speed of the suction roller 40 is set so that the speed of the drum surface 40a (conveyance speed) is faster than the supply speed of the chipping paper P, and the chipping paper P is controlled by the suction action of the drum surface 40a, which will be explained later. While being pulled by the tip paper, the tip portion PA is caused to slide on the drum surface 40a by the tension thereof, whereby the chip paper pieces P after being cut by the cork knife 50 are successively attracted to the drum surface 40a while maintaining a predetermined interval. Ru. Then, the chip paper piece P cut into a rectangular shape is supplied to the transfer drum 60 by rotation of the drum surface 40a.

FIG. 10 is a diagram showing the relationship between the suction roller 40 and the transfer drum 60.
On the drum surface of 0, there is a support part 6 with the arcuate surface facing outward.
0a are arranged at regular intervals corresponding to the conveyance pitch of the tip paper pieces p, and a double-cut tobacco T and a filter plug F are held by suction on these support parts 60a with their cut ends aligned. And suction roller 40
A double-cut tobacco T and a filter plug F are brought into contact with the tip of the glued surface of the chip paper pieces P being conveyed, and the chip paper pieces P are sequentially picked up and wound into a double roll by a heater drum (not shown).

FIG. 11 is a diagram showing a drum surface 40a of the suction roller 40, and as shown, a large number of suction holes 40b are formed in the drum surface 40a. The suction holes 40b are arranged at regular intervals in the conveying direction of the chip paper piece P (the direction of the arrow in the figure), and the collection is arranged in an area slightly smaller than the outer shape of the chip paper piece P and has a rectangular circumference. It is located.

Further, a suction hole 40b is provided on the back side of the drum surface 40a.
A pipe 40c is formed that opens to the side surface of the drum, and a control ring (not shown) disposed in contact with the side surface of the drum draws suction from the pipe 40c, thereby generating suction force at the suction hole 40b. Note that the chip paper piece P is connected to the suction hole 40.
With b closed, the peripheral edge is placed perpendicular or parallel to the conveyance direction and vacuum suctioned at the suction hole 40b.

[Problem to be solved by the invention]

Even if the above-mentioned chipping paper pieces are cut to a certain size, if they are not adsorbed to a predetermined position on the drum surface of the suction roller and conveyed, they will be damaged when the double-cut tobacco and filter plug are rolled up in the next process. This will result in rolling defects, leading to the production of defective products. In addition, this misalignment of the tip paper piece may be due to deterioration of the cork knife or
Poor running when unwinding the chip paper from the bobbin, such as lateral deviation in the transport direction of the chip paper,
Alternatively, this often occurs due to slippage during connection when automatically exchanging tip paper bobbins using a plurality of tip paper rolls.

SUMMARY OF THE INVENTION An object of the present invention is to provide a misalignment detection device that can automatically detect misalignment of a piece of tip paper with respect to a drum surface of a suction roller.

[Means to solve the problem]

In order to solve the above problems, the conveyance material piece positional deviation detection device of the present invention has an opening in a conveying surface for conveying a sheet-like material piece in an area slightly smaller than the outer periphery of the sheet-like material piece. Regarding a conveying device, a plurality of suction ports are formed, and the sheet-like material piece is adsorbed to a conveying surface by the suction ports by suction pressure in the suction ports,
A conveying material piece positional deviation detection device for detecting a positional deviation of the suctioned sheet-like material piece with respect to the conveying surface, the apparatus comprising: a pressure sensor for detecting the suction pressure; and a pressure sensor for detecting the suction pressure; a comparison means for comparing the output of the pressure sensor with a set value corresponding to a pressure lower than the suction pressure when all openings of the suction ports of the pipe are closed; The apparatus is characterized in that the apparatus further comprises a positional deviation determining means that outputs a positional deviation detection signal when the suction pressure of the apparatus becomes equal to or less than the pressure corresponding to the set value.

[For production]

In the conveyance device, the sheet-like material piece is attracted to the conveyance surface by a plurality of suction ports by suction pressure, but since the plurality of suction ports are opened in an area slightly smaller than the outer periphery of the sheet-like material piece. When the sheet-like material piece is attracted to a position shifted from the conveying surface, the openings of at least some of the plurality of suction ports are no longer blocked by the sheet-like material piece, and the suction pressure decreases. .

At this time, the positional deviation detection device of the conveyed material piece of the present invention
The suction pressure is detected by the pressure sensor and its output is compared with the set value by the comparison means, and the positional deviation determination means determines that the suction pressure has become less than the pressure corresponding to the set value based on the comparison result of the comparison means. is detected and outputs a positional deviation detection signal.

[Example] Fig. 1 is a diagram showing a filter tip attachment machine for a cigarette manufacturing apparatus using a positional deviation detection device according to an embodiment of the present invention, and the same parts as in Fig. 8 are given the same reference numerals. be.

In the figure, 1 is a control ring disposed in contact with the suction roller 40, 2 is a pressure sensor connected to the control ring 1, and 3 is a comparison between the output voltage of the pressure sensor 2 and a preset voltage. Comparator, 4
5 is a signal processing unit that detects positional deviation based on the comparison result of the comparator 3 and outputs an exclusion signal for eliminating defective products; 5 is a suction device that applies suction force to the control ring 1;

The process after the transfer drum 60 is similar to a conventional filter tip attachment machine, and the double-cut tobacco with a piece of tipping paper and the filter plug are supplied to the heater drum 70 along with the transfer drum 60.
It is rolled up into a double roll as shown by ■ in the figure, dried, and transferred to a checking drum at 8 degrees. Then, a part of the filter of the normal double winding is cut by the final cutting drum 90 and the final cutting knife 100 and transferred to the next process, and the defective double winding is transferred to the removal section 80a.
is removed downward by the checking drum 80.

Note that the rejecting section 80a drives a rejecting valve (not shown) in response to input of a rejecting signal to reject defective products. In addition, a synchronous sensor (proximity sensor) 80b is provided on the checking drum 8o to determine the timing of removal, and a pulse signal (one pulse per double winding) output from this synchronous sensor 80b is used as a signal. The signal is input to the processing unit 4 and used for synchronization of signal processing, which will be explained later.

FIG. 2 is an exploded perspective view showing a portion of the suction roller 40.

A large number of suction holes 40b are formed in the suction roller 40, as described with reference to FIG.
Each suction hole 40b is communicated with the sink roll ring 1 side through a pipe 40C.

The control ring 1 is a ring-shaped device with a flat side surface IA on the side of the suction roller 40, and is placed close to the side surface of the suction roller 40a so that the center of the ring coincides with the rotation center 0 of the suction roller 40. It is arranged.

A first suction groove 11 and a second suction groove 12 having the same radius as the radius from the rotation center 0 of the suction roller 40 to the open end of the pipe 40c are formed on the side surface IA of the control ring 1.

The first suction groove 11 is formed from a position in front of the cork knife 50 where the tip paper P is adsorbed to a position in front of the transfer drum 60.
At the end of the transfer drum are 60 double-cut tobacco Ts.
A vacuum hole 13 is provided just before the position where it contacts the filter plug F, and a second suction groove 12 is formed at a slight distance from the vacuum hole 13.

Further, pipes 51 and 52 are attached to the control ring 1, and the pipe 51 communicates with the first suction groove 11, and the pipe 52 communicates with the second suction groove 12, so that the first suction groove 11 and the second suction groove As shown in FIG. 1, the inside of the tube 12 is individually suctioned by the suction device 5 through the pipes 51, 52 and the branch pipe 53.

When the suction roller 40 rotates as shown by the arrow in FIG.
The inside of each suction hole 40b is sucked by each suction groove when the open end of the pipe 40c is placed over the first suction groove 11 or the second suction groove 12.

That is, the tip paper piece p is moved to the suction roller 4
0, while passing through the range of the first suction groove 11, the drum surface 40 is attracted by the suction hole 40b.
It is sucked and held by a and transported as it is to the vacuum hole 13. At the position of this vacuum hole 13, the suction hole 40
The suction force b is released, and the tip paper piece p comes into contact with the double-cut tobacco T and filter plug F on the transfer drum 60 side and is picked up. Further, the chip paper pieces that were not transferred to the transfer drum 60 side for some reason are again attracted to the drum surface 40a at the position of the second suction groove 12 and are removed to the side opposite to the coke knife 50.

In addition, in conventional control rings, the first suction groove and the second suction groove are communicated within the control ring, and the inside of both suction grooves is sucked from the first suction groove by a suction device. Even with conventional control rings, the first suction groove and the second
The same structure as above can be achieved by closing the communicating portion with the suction groove.

As shown in FIG. 2, a pressure detection pipe 14 is attached to the first suction groove 11 in addition to the pipe 51 on the suction device 5 side, and a pressure sensor 2 is attached to the tip of this pressure detection pipe 14. installed. This pressure sensor 2 detects the pressure inside the first suction groove 11 and outputs a voltage signal according to the suction force (suction pressure) of the tip paper. A pressure transducer or the like can be used.

FIG. 3 is a diagram showing an example of misalignment of the tip paper pieces, and the broken line in the diagram shows the normal state.

When the tip paper piece P' is attracted to the normal position, all of the suction holes 40b are attached to the tip paper piece P.
', the suction pressure becomes constant and the output voltage of the pressure sensor 2 becomes constant.

Also, for example, as shown by the solid lines in Figures (a) and (b),
If the knob paper piece p is misaligned, one or more suction holes 40b will open, the suction pressure will decrease, and the output voltage of the pressure sensor 2 will change from a constant value.

In this way, by monitoring the output voltage of the pressure sensor 2, it is possible to detect a positional shift of the tip paper piece p such that the suction hole 40b protrudes.

As shown in FIG. 6, the pressure sensor 2 of this embodiment is one in which the output voltage changes from 1 to 5 DC when the suction pressure changes from 0 to -1 kg/ctfl. . When the piece of paper is adsorbed in the normal position, the suction pressure is approximately -0.
, 5kg/cj, the output voltage of the pressure sensor 2 at this time is approximately 3■.

Additionally, the comparator 3 outputs a 0N10FF signal depending on whether the input voltage from the pressure sensor 2 is larger or smaller than the preset voltage, and the set voltage is the output voltage of the pressure sensor 2 during normal operation. (In this example, 3
V) Positional deviation detection is performed by setting the voltage to a smaller value, for example, 2.8V. That is, the output voltage of pressure sensor 2 is 2.8V.
In the following cases, it is determined that there is a "positional shift of the tip paper piece", and a signal at L'' level is output to the signal processing section 4 as a positional shift detection signal.

In FIG. 1, the voltage signal of the pressure sensor 2 is input to the comparator 3, and the comparator 3 compares the set voltage with the output voltage of the pressure sensor 2 and outputs a positional deviation detection signal to the signal processing section 4. Then, the signal processing section 4 generates an exclusion signal based on the synchronization signal generated from the output signal of the synchronization sensor 80b and the positional deviation detection signal from the comparator 3, and outputs this to the exclusion section 80a.

FIG. 4 is a block diagram of the signal processing section 4, and FIG. 5 is a time chart showing an example of its operation.

The synchronization signal adjustment unit 41 generates a reference synchronization signal a of one pulse per double winding from the pulse signal from the synchronization sensor 80b, and also generates a reference synchronization signal a with a slight delay from the reference synchronization signal a in order to take the timing of signal processing. Delayed synchronization signal a2
generate.

The defect detection storage unit 42 is composed of a flip-flop or the like,
The positional deviation detection signal from the comparator 3 is temporarily stored and a defective signal C is output, and when the positional deviation detection signal is no longer present, the defective signal C is synchronized with the delayed synchronization signal a2.
Reset.

The forced exclusion number setting unit 43 is composed of a counter, etc., and the counter is reset while the failure signal C in the failure detection storage unit 42 is present, and when the failure signal C disappears (°“L”).
level), the counter starts counting, and counts the number of reference synchronization signals a corresponding to the preset number of forced exclusions. Then, until this counting is completed, the failure signal output section 4
A control signal is output to 4.

The defect signal output section 44 is composed of a flip-flop, and when the reference synchronization signal a is input, the defect detection storage section 42
When there is a defective signal C, and while a control signal is being input from the forced exclusion number setting section 43, the defective signal d is output to the exclusion stage number delay section 45.

As a result, the exclusion stage number delay section 45 receives the defective signal d only while the defective signal C is present and during the period of the reference synchronization signal a1 corresponding to the number of forced exclusions set in the forced exclusion number setting section 43.
is output.

The exclusion stage number delay unit 45 is composed of a multistage shift circuit or the like,
sequentially storing the defective signal d in synchronization with the delayed synchronization signal a2;
After shifting by a preset number of stages, the shifted defective signal d' is output to the exclusion signal output section 46.

The exclusion signal output section 46 ANDs the shifted defective signal d' from the exclusion stage number delay section 45 and the delayed synchronization signal am, and outputs this as an exclusion signal e to the exclusion section 80a.

The shifting operation of the exclusion stage number delay section 45 is performed when detecting a positional deviation on the suction roller 40 and when the checking drum 8 is detected.
This is to adjust the time difference from the removal operation at 0, and the number of shift stages is set according to the number of stages from the suction roller 40 to the checking drum 80 (the number of chip paper pieces and double windings). Further, the number of forced removal items set by the forced removal number setting section 43 is set as the number of extra items to be removed (two in the above example) in order to reliably remove defective products.

Misalignment of chipping paper pieces is likely to occur when cutting with the cork knife 50. For example, if one chipping paper piece is misaligned, the time required for that chipping paper piece to be transferred to the transfer drum 60 is limited. A positional deviation detection signal is output. For example, as shown in FIG. 7, if the number of stages from immediately after being cut by the cork knife 50 to before transferring to the transfer drum 60 is three, one chip paper piece p immediately after cutting can produce three sheets. The positional deviation detection signal is output for a period of time (3 steps).

Therefore, the removal operation corresponding to this positional deviation detection signal is performed continuously for the three double windings, so for example, if the total number of stages from immediately after cutting to the removal position of the checking drum 80 is 37, the shift The number of stages is 35
It may correspond to any number of exclusion stages from 1 to 37 stages.

Furthermore, it is assumed that a chip paper piece that was in the normal position immediately after cutting may become misaligned for some reason. For example, if a misalignment occurs for the first time at 35 stages, the misalignment detection signal will only be for one piece. No output.

On the other hand, if the number of removal stages is set to 35, it is possible to reliably remove the tip paper pieces that have caused this positional shift. However, with only this positional deviation detection signal for one sheet,
As mentioned above, positional deviations immediately after cutting cannot be eliminated.

On the other hand, the number of forced exclusions (
In the above example, 2) is set, so in the above example, if the number of exclusion stages is set to 35, no matter where on the drum surface 40a of the suction roller 40 misalignment occurs,
Defective products due to this positional shift can be reliably eliminated.

In addition, with conventional filter tip attachment machines,
In order to take into account the misalignment of chip paper pieces due to slips during connection when automatically replacing the chip paper bobbin, the checking drum is forced to remove the pieces for a certain period of time, so this system operates at high speed. In other types of devices, there was a lot of loss in normal double winding, but according to the above example, the positional deviation of the chipping paper pieces can be automatically detected in approximately the same manner as the number of stages of the chipping paper pieces, so this can be eliminated. Loss of double winding of good products due to operation can be extremely reduced. Furthermore, double winding due to rolling defects, which could not be detected due to near leaks, can also be eliminated.

In the above embodiment, the output voltage of the pressure sensor 2 when the tip paper piece p is attracted to the normal position is about 3V, whereas the criterion for positional deviation, that is, the set voltage of the comparator 3, is set to 2. Although the case where the setting voltage is set to 8■ has been described, this setting voltage may be set to a desired value in consideration of the permissible range of positional deviation and fluctuation of the output voltage during normal operation.

〔Effect of the invention〕

As explained above, according to the positional deviation detection device for a conveyed material piece of the present invention, on a conveyance surface in which a plurality of suction ports opening in an area slightly smaller than the outer periphery of a sheet-like material piece are formed,
For a conveying device that uses suction pressure in a suction port to attract sheet-like material pieces to a conveying surface, a comparing means compares the output of a pressure sensor with a set value and detects that the suction pressure has become lower than normal. However, since the opening of at least some of the plurality of suction ports is not blocked by a piece of sheet-like material, it is detected that
Misalignment of the sheet-like material piece relative to the conveying surface can be automatically detected. Therefore, it can be used in cigarette manufacturing equipment to automatically detect misalignment of chipping paper pieces with respect to the drum surface of the suction roller, and it is possible to reliably eliminate defective products while minimizing loss of good products. .

[Brief explanation of drawings]

Fig. 1 is a diagram showing a filter tip attachment machine to which a positional deviation detection device according to an embodiment of the present invention is applied, Fig. 2 is an exploded perspective view showing a suction roller portion in an embodiment, and Fig. 3 is a tip paper in an embodiment. FIG. 4 is a block diagram of the signal processing unit in the embodiment. FIG. 5 is a time chart showing an example of the operation of the signal processing unit. FIG. 6 is the pressure sensor in the embodiment. Figure 7 is a diagram showing the number of stages from the coke knife to the removal position in the example, Figure 8 is a diagram showing the tip paper piece supply section in a conventional filter tip attachment machine. Figure 9 is a diagram showing the suction roller and coke knife in the same feeding section, Figure 10 is a diagram showing the relationship between the suction roller and transfer drum of the same filter tip attachment machine, and Figure 11 is a diagram showing the relationship between the suction roller and the transfer drum in the same feeding part. It is a figure showing the drum surface of a suction roller. 1...Control ring, 2...Pressure sensor, 3
... Comparator, 4 ... Signal processing section, 5 ... Suction device, 11 ... First suction groove, 12 ... Second
Suction groove, 40... Suction roller, 40a...
...Drum surface, 40b...Suction hole, p...Chimp paper piece.

Claims (1)

[Claims] A plurality of suction ports opening in an area slightly smaller than the outer periphery of the sheet-like material piece are formed on the conveying surface for conveying the sheet-like material piece, and the suction pressure within the suction port causes the above-mentioned Regarding a conveying device in which a sheet-like material piece is attracted to a conveying surface by the suction port, a positional deviation detection device for a conveyed material piece is configured to detect a positional deviation of the attracted sheet-like material piece with respect to the conveying surface. a pressure sensor that detects the suction pressure; a set value corresponding to a pressure lower than the suction pressure when the sheet-like material pieces block all openings of the plurality of suction ports; and an output of the pressure sensor. and positional deviation determining means for outputting a positional deviation detection signal when the suction pressure in the pipe becomes equal to or less than the pressure corresponding to the set value, based on the comparison result of the comparing means. A positional deviation detection device for conveyed material pieces, comprising: