JP3243241B2 - Roll paper for partially wrapping drug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent edge wear, etc., from being caused in drug portion packaging work by feeding a sheet smoothly without abruptly varying a tension force in accordance with the decrease of a diameter of a rolled paper when the sheet is to be fed from the rolled paper in a sheet feed unit to a portion packaging unit. SOLUTION: When a sheet S is fed to a heating roll 6 in a portion packaging unit from rolled paper R in a sheet feed unit to portion packaging drug, this drug portion packaging apparatus controls to brake the feeding of the sheet S by means of both of a length measuring sensor comprising a rotary encoder 32 provided along the path for feeding the sheet S and an angle sensor comprising the combination of a plurality of Hall element sensors 25 provided to a support shaft of the rolled paper R and a plurality of magnets 24 provided to a core tube of the rolled paper R, respectively. In a control unit, one of respective signals from each sensor is set to be a reference signal, and a wound quantity of the rolled paper is found on the basis of the variation of the other signal. Thus, the control unit controls to brake the feeding of the sheet S stepwise on the basis of a control signal corresponding to a diameter of the wound quantity and regulates properly the feeding of the sheet S without abruptly varying a tension force to prevent edge wear and sheet tearing from being caused in portion packaging work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medicine packing apparatus used in a medicine packing apparatus for feeding a sheet from a paper feeding section and packing the medicine in a packing section while adjusting the tension of the sheet drawn from the roll paper. The arrangement structure of the magnets of the roll paper.

[0002]

2. Description of the Related Art As a medicine packaging apparatus, a sealing apparatus is provided on a transfer path for drawing and transferring a sheet of a heat-fusible packaging paper sheet from a sheet supply section which rotatably supports a roll of a sheet of heat-fusible packaging paper. After the sheet is folded in two at the upstream side of the sealing device and the medicine is supplied in the meantime, the sealing device heats and fuses the sheet in a band shape in the width direction and both side edges to separate the medicine. Is known.

[0003] When the sheet is used out, it is replaced with a new roll, and the sheet is pulled out from the new roll and set in a packaging device. The sheet pulled out from this sheet roll is always pulled out with a constant tension so that it is not folded exactly at the time of fusing the peripheral edge etc. after being folded in two, and is not fused in a slightly shifted state. However, since the roll diameter actually changes in accordance with the amount of sheet drawn out, the pulling tension also changes little by little.

For this reason, Japanese Utility Model Publication No. 1-36832 proposes a sheet tension adjusting device that adjusts the tension so that the tension becomes substantially constant even when the diameter of the sheet roll changes. In the sheet tension adjusting device according to this publication, a sheet roll is detachably fitted to and mounted on a roll support cylinder, a plurality of winding diameter detection sensors are arranged in the radial direction on the side of the sheet roll, and the roll support is performed by a signal from the detection sensor. The electromagnetic force of the electromagnetic brake provided inside the cylinder is adjusted to gradually reduce the braking force as the roll diameter becomes smaller, so that the tension is adjusted to be constant.

[0005]

However, the above-described conventional sheet tension adjusting device employs a system in which a change in the amount of winding due to the use of a sheet is detected stepwise by a winding diameter detection sensor arranged in a radial direction. Accordingly, when the diameter of the rank of the detection sensor is changed, a vibration phenomenon occurs in which the braking force rank of the electromagnetic brake fluctuates up and down every rotation due to the eccentricity of the core tube shaft, the weight of the seat, the winding distortion, and the like. For this reason, when the sheet is folded in two at the packaging section due to a change in tension, the edges of the sheet do not overlap exactly, that is, a so-called ear gap may occur, and a defective packaging portion may occur.

[0006] Further, since the rank of the braking force fluctuates rapidly, a tear may occur in the width direction. In addition to the above, the cause of the malfunction of the detection sensor is caused by the use of a light reflection type sensor. There are various materials such as glassine paper (translucent) and cellopoly paper (transparent) as the material of the sheet used in the medicine packaging apparatus. Reflected light is reflected when the end surface position of these sheets is slightly changed for each layer. However, the detection accuracy deteriorates due to the difference in the return and is not detected as a signal. In particular, in the case of cellopoly paper, the influence of the humidity change is large, so that the winding is likely to meander, and the detection accuracy may be deteriorated due to the unevenness of the end face.

Further, a thermal printer for printing on a wrapping paper is generally provided upstream of the position where the sheet is folded in two at the wrapping portion. The lamp of the display mechanism may cause a decrease in durability due to a vibration phenomenon.

On the other hand, the roll paper used in the medicine packaging apparatus is formed by winding an ultra-thin sheet of about 30 μm of the above-described glassine paper or cellopoly paper in a roll shape around the outer periphery of a hollow core tube. Generally, it is quite long, 300 to 500 m. As a method other than the method using the above-described roll diameter detection sensor for detecting a change in the roll diameter of the roll paper, a method of mounting a sensor for detecting the rotation speed of the support shaft on a rotary support shaft on which the roll paper is mounted, or a roll. A method is conceivable in which a protrusion is provided at the end of the hollow core tube of paper, and a mark provided on the protrusion is read by an optical sensor.

However, with the sensor on the rotating support shaft, a rotation deviation may occur between the rotating support shaft and the hollow core tube depending on the degree of tension at the time of feeding the sheet of the roll paper. For accurate detection, it is necessary to directly detect the rotation of the roll paper itself, and a method using a sensor on the rotation support shaft is not always appropriate.

In the method of providing the protruding portion at the end of the hollow core tube, since the above-described long roll paper becomes quite heavy as a whole, operations such as mounting on a rotating support shaft are heavy. There is a possibility that the projecting portion may be damaged by hitting the surrounding device at times, and the method of providing the projecting portion is not preferable.

The present invention takes into account the above-mentioned problems in the conventional medicine packaging apparatus, and controls the influence by a delicate fluctuation of the roll paper diameter due to the winding state of the roll paper wound with an extremely thin sheet. The brake force is set accurately for each step without causing fluctuation in the level of the brake force that is selected stepwise, and an appropriate tension corresponding to the diameter of the roll paper is stably applied to the sheet feeding section, and the sheet A medicine that is used in a medicine packing apparatus that can pack medicine in a packing sheet without causing displacement or tearing, and that can provide rotation angle data to an angle sensor in a paper feeding unit of the packing apparatus. It is an object to provide a roll paper for packaging.

Another object of the present invention is to provide an arrangement structure of a magnet of a roll paper for medicine packaging which can provide rotation angle data in the roll paper for medicine packaging .

[0013]

According to the present invention, as a means for solving the second problem, a hollow shaft is rotatably provided around a non-rotatably supported support shaft, and the hollow shaft is provided with a hollow shaft. Is a paper feed unit that engages a motor brake and feeds a sheet of roll paper detachably mounted on a hollow shaft with a feed roller, and folds the sheet in half and feeds a medicine from a hopper in the meantime to feed the medicine. A packaging section having a heating roller for heat-sealing the sheet at predetermined intervals in the width direction and both side edges, and an angle sensor provided on a support shaft for detecting the rotation angle of the roll paper; A length measuring sensor for measuring the sheet feeding length on the sheet feeding path to the roll paper is provided, and means for connecting the roll paper to the hollow shaft so as to be rotatable is provided at an end where the roll paper and the hollow shaft are in contact with each other. Based on sea Used tension to drug packaging device which is adapted to packing the drug while adjusting in response to the roll paper size, in order to impart a sheet tension corresponding to the winding amount of the seat b Rupepa the hollow shaft, the hollow shaft Rotatably supports
The amount of sheet winding is determined by the angle sensor provided on the non-rotating support shaft.
For dispensing medicine by placing a magnet in a position where can be detected
The structure of the rupeper magnets was adopted.

[0014]

In the above-described medicine packaging apparatus, the packaging operation is performed by adjusting the sheet tension of the sheet supplied from the paper feeding section so that ear separation and tearing do not occur in the packaging operation in the packaging section. At this time, it is assumed that signal detection is performed by two sensors, a length measuring sensor and an angle sensor. When the detection signals from the two sensors are obtained, a change in the winding amount due to a change in the other sensor is directly obtained based on a predetermined amount of one of the sensors.

If the predetermined range of the change in the winding amount is made to correspond to the change in the winding diameter of the roll paper in advance, it is possible to select the stepwise control level of the braking force only by detecting the change in the winding amount. Therefore, the braking force is controlled in accordance with the diameter of the winding amount, and the sheet tension can be adjusted to an optimum tension for each step.

In this case, even if the braking force is changed stepwise, each rank of the braking force is sequentially increased so that the braking force changes within a range in which a change in tension due to the switching does not cause ear slip or tear. Since the roll paper can be switched to a smaller one, in the conventional method where the roll diameter of the roll paper is directly detected by a sensor, the rank of the braking force is switched due to the uneven winding of the winding diameter. Does not occur due to the difference in the control method.

The present invention is applied to the medicine packaging apparatus of the present invention.
That, according to the magnet arrangement of the drug packaging roll paper, medicine
When using the roll paper for agent packaging, it is attached to the hollow shaft of the support shaft in the paper feed unit so that it can be attached and detached and rotated freely,
In order to control the brake means which engages the hollow shaft with respect to the angle sensor, the winding amount data of the seat is generated by a magnet arranged so as to be detectable. Therefore, the arrangement structure of the magnets
It is possible to detect the data of the winding amount of the sheet.

[0019]

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a medicine packaging device in which a paper feeding unit and a packaging unit are taken out. The paper feed unit is rotatably mounted on a support shaft 1 which is horizontally supported, a roll paper R obtained by winding a sheet for packaging medicine around a core tube P in a roll shape,
The packaging sheet S pulled out from the roll paper R passes through the feed rollers 2 and 3 and is supplied to the next packaging section.

When a predetermined amount of medicine is introduced from the hopper 5 when the package is folded in two by the triangular plate 4, it is heated at a predetermined interval by the heating roller 6 having a perforated cutter, and is separated from the both sides by the heating roller 6. Is heat-sealed in a strip shape. Although there are many other components in the packaging unit, only necessary components are shown in order to avoid complication.

FIG. 2 is a main longitudinal sectional view showing a state in which the roll paper R and the core tube P are mounted on the paper feeding section. As shown in the drawing, a support shaft 1 has a center shaft 1a, one end of which is attached and fixed to a support plate 11 by a nut, and an outer shaft 1b integrally fitted thereto.
And a bearing 1 provided at a position near both left and right ends of the outer shaft 1b.
Hollow shaft 1c rotatably mounted via 2 and 12
Consisting of

Reference numeral 13 denotes a shaft head at one end of the center shaft 1a;
Is a flange portion at one end of the outer shaft 1b. A flange 15 is also provided at the opposite end of the hollow shaft 1c. When the core tube P and the roll paper R wound around the core tube P are mounted on the support shaft 1, the core tube P is rotatably supported by the hollow shaft 1c, and a plurality of tubes are disposed on the inner surface of the flange portion 15 at appropriate intervals. The attached core tube P and roll paper R are attached to the hollow shaft by the attracting force to the magnet 16 and the ferromagnetic material (iron portion) 17 which is disposed along the end face circumference of the core tube P in advance. 1c so as to be detachably fixed.

A motor brake 20 is engaged with the hollow shaft 1c, and the packaging sheet S fed from the roll paper R is used.
To moderate tension. The motor brake 20 is mounted on the support plate 11, rotates a gear unit 21 via a transmission belt (not shown), and a pinion 22 provided on an output shaft thereof is rotated by a large gear 23 provided on an outer end surface of the flange portion 15. To apply a braking force to the hollow shaft 1c.

The motor brake 20 is a small AC motor (AC), and is used to apply a DC voltage as a power supply to provide a braking force. In this case, as will be described later, the value of the DC voltage is changed in four stages, and the braking force is changed in accordance with the magnitude of the tension of the packaging sheet S fed out.

As for the magnet 24 and the Hall element sensor 25, and the proximity switch 26 and the projection 27, as shown in FIGS. 2 and 5, a rotation angle sensor comprising the magnet 24 and the Hall element sensor 25 provided on the core tube P. 3 and a signal from a sensor for detecting the displacement of the packaging sheet including the proximity switch 26 and the protrusion 27 are input to the control circuit 30 as shown in FIG. 3 (the control circuit 30 will be described later).

That is, the feeding amount of the wrapping sheet S of the roll paper R is accurately calculated from the signal of the length measuring sensor of the first embodiment and the signal of the rotation angle sensor to calculate the roll paper R.
The brake force is adjusted in accordance with the change in the winding diameter of the roller and the tension is adjusted appropriately.

As shown in FIG. 6, the core tube P of this embodiment
The magnet 24 and the Hall element sensor 25 respectively provided along the inner circumference of the support shaft 1 and at one end of the support shaft 1 have four magnets 24 arranged at four different positions 67.5 ° apart from one base point. The element sensors 25 are arranged at four positions on a center line passing through the base point and a center line orthogonal to the center line.

In the above arrangement, the number and arrangement of the magnets 24 and the Hall element sensors 25 are selected as the most rational combination. For example, as shown in FIGS.
Various modifications are possible. However, in any arrangement, the angle signal indicating the rotation of the core tube P by the Hall element sensor 25 emits one pulse signal every time the core tube P rotates 22.5 °, and any arrangement may be adopted. Needless to say.

In the above example, a combination of the magnet 24 and the Hall element 25 is used as a detector for detecting the rotation of the core tube P, but an optical sensor may be used instead.
The optical sensor is composed of a light emitting element and a light receiving element, and these are fixed and attached to one end of the support shaft 1 (outer shaft 1b), like the Hall element 25.

However, the mounting position is such that a part of the flange end of the outer shaft 1b is extended closer to the outer end than the Hall element sensor 25 in FIG. 2 or an equivalent mounting seat is formed.
Are also provided at a predetermined angle pitch of 22.5 ° at a side end of the optical sensor so that the light emitting element and the light receiving element of the optical sensor sandwich the projection. The number of optical sensors and projections is
Is the same as

FIG. 3 is a schematic block diagram of a circuit for controlling the main members of an apparatus for feeding a packaging sheet from a paper feeding section to a packaging section and packaging a medicine. The control circuit 30 includes an end sensor 31
, A signal from a rotary encoder 32 provided on the feed roller 3, or a signal from a rotation counter 33 for measuring the rotation speed on an output shaft of a motor 6a connected to the shaft of the heating roller 6. Thus, a control command for applying a braking force to the motor brake 20 and a control command for the motor 6a are output. Reference numeral 34 denotes an input unit for inputting data from outside.

FIG. 5 is a side view as seen from the direction of arrows VV in FIG. 2, and is mainly for showing the arrangement of the displacement detecting sensor of the packaging sheet. In this example, one proximity switch 26 is provided on the support plate 11, and 16 protrusions 27 are formed on the flange 15 at the end of the hollow shaft 1 c on which the support shaft 1 rotates.

This displacement detection sensor attempts to detect the presence or absence of a dislocation displacement of the packaging sheet by not detecting a signal having the same pitch as the reference signal based on the signal of the rotation angle sensor by the Hall element sensor 25 described above. Things.

In the medicine packing apparatus according to the embodiment having the above-described configuration, the medicine packing operation is performed while adjusting the sheet tension as follows. In this embodiment, the roll paper R set in the paper feed unit has a maximum diameter d _max and a minimum diameter d ₀ .
As shown in (1), the braking force of the motor brake 20 is set to 4 by the feeding amount 1 of the packaging sheet obtained based on the length measurement signal by the rotary encoder 32 and the angle θ based on the pulse signal of the Hall element sensor 25 which is an angle sensor. The tension is adjusted with an optimum braking force in accordance with the change in the diameter of the roll paper R by controlling in stages.

The roll paper R in the illustrated example has a maximum diameter d.
_max = 160 mm, minimum diameter d ₀ ≒ 64 mm, and sheet thickness γ = 30 μm. Therefore, assuming that the range in which the diameter changes with the use of the packaging sheet S is simply divided into four stages, the motor brake may be changed every time the diameter is reduced by (160−64) / 4 = 24 mm.

At this time, the sheet length for each stage is as follows. The winding length L of the roll paper R at an arbitrary diameter is represented by the following equation.

[0038]

(Equation 1)

On the other hand, the diameter of the roll paper R is given by the following equation. _{d max = d 0 + 2 ×} nγ ...... winding length L _max of the time of the roll paper R is the maximum diameter (2) (1) equation, L _max = [64 × n + n (n + 1) × 30 × 10 -3 From the formula (2), d _max = 64 + 2 × 30n × 10 ⁻³ = 160 (mm) and n = 96/6 × 10 ⁻² = 1600 times, so that L _max = (64 + 1601 × 30 × 10 ⁻³ ) × 1600π = 562.688 (m) Now, the stage in which the diameter of the roll paper R decreases is divided into four stages, and each stage N in which the diameter decreases in order from the maximum diameter is N =
If it is called 1, 2, 3, 4, the maximum length of each winding length at each stage is as follows.

When N = 1, L _max = 562.688 (m) (n = 1600, d _max = 160) When N = 2, L _max = 376.800 (m) (n = 1200, d _max = 136) ) When N = 3, L _max = 221.056 (m) (n = 800, d _max = 112) When N = 4, L _max = 95.456 (m) (n = 400, d _max = 88) In FIG. 8, the numbers of magnets 24 and Hall element sensors 25 are different from those in the above-described embodiment, but one pulse signal is output every rotation of 22.5 ° as described above. Are the same, different arrangement examples are used for easy understanding and convenience of explanation.

As shown in the drawing, when the winding amount 1 of the packaging sheet is fed, if the winding radius is large as in (a), the number of pulses of the angle sensor is small, and as in (b), the winding radius is small. If the number of pulses increases. Therefore, if the maximum number of pulses is 3, for example, and the minimum number of pulses is 10, as shown in FIG.
The process in which the number of pulses changes from 3 to 10 is divided into, for example, four stages corresponding to the change in the diameter of the roll paper R, and a DC voltage that can apply a tension corresponding to each diameter stage to the packaging sheet S is applied to the motor brake 20. To adjust the braking force.

The relationship between the tension levels N = 1 to 4 and the number of pulses is as follows in the actual example of FIG. Assuming that the maximum diameter of the product of the roll paper R is 160 mm and the minimum diameter is 64 mm, the feed amount per rotation at the maximum diameter is π × 160 mm, and the angle sensor 25 is provided at an interval of 22.5 ° with one (16 pieces per rotation). ) Since a pulse signal is issued, the length of the wrapping sheet S fed out every time one pulse signal is issued is π ×
160/16 = 314 m / m, and the number of pulses is 10 at a delivery amount of 3140 m / m.

Similarly, the relationship between the feeding amount at the minimum diameter and the number of pulses is from π × 64/16 = 129.5 m / m to 3140 m / m.
The pulse number is 3140/1295 × 10 at the feeding amount of m / m.
= 24.2.

When the change in the number of pulses is divided into four stages and the DC voltage is changed corresponding to each tension level, the following is obtained. Tension level N Number of pulses DC voltage N = 1 10 to 1325 V N = 2 14 to 17 16 V N = 3 18 to 21 12 V N = 4 22 to 24.28 V In the above description, the feeding amount is fixed and the angle sensor is used. The tension level N is adjusted by changing the number of pulses. On the contrary, the tension level may be adjusted by estimating the state of the paper winding amount by changing the feeding amount based on a fixed number of pulses of the angle sensor. The good things need not be explained.
Hereinafter, the former adjustment method will be described more specifically.

9 and 10 show flowcharts of the operation of the tension adjustment. FIG. 9 is a flowchart of the special mode for the tension adjusting device to enter the normal mode, and FIG. 10 is a flowchart of the normal mode.

The special mode shown in FIG. 9 means a preliminary operation for checking operating conditions in advance before starting a normal packing operation in the packing apparatus and adjusting the conditions so that the normal mode can be easily entered. . It is generally assumed that the preparatory work to ensure that the sheets are set correctly before the packaging sheet is first set in the packaging device and the packaging operation is started is performed by manual inching operation. And
The control mode always passes through this special mode.

The determination of whether a special mode in step S _0, the end sensor as a condition, the operation of the joint seal, inching mode, if it is detected even one reverse detection of the winding quantity sensor, the special mode It is determined to perform the operation. The operation of the joint seal means that the next roll paper is set in the paper feed unit while one roll paper is consumed and the paper runs out, and the paper splicing operation with the previous roll paper is performed.

In the inching mode, before the start of all operations, the control circuit is switched to the inching mode by a switch, and the packaging sheet is set manually as described above. This is a condition for confirming this.

It is to be noted that it is necessary to enter the special mode as a prerequisite for the operation when the roll paper is supplied is not always a new complete roll paper and a roll having a winding amount of, for example, about half is set in the middle. Because there is. Therefore, as described below, when the roll paper is about half, the tension adjustment is made in advance to an intermediate tension that is smaller than the tension corresponding to the entire winding amount but slightly larger than the tension corresponding to the winding amount. Done.

[0050] First, when it is determined that the special mode in Step S _0, sets the tension in the maximum tension in step SS _1, at the same time various sensors (reference sensor, rotation number counter, winding amount sensor, core pipe slip sensor) the Activate (SS ₂ ).
In this state, the packaging sheet is fed little by little by manual inching operation, and the rotary encoder 32 serving as a length measuring sensor is fed.
And the signal of the Hall element sensor 25, which is an angle sensor, are read.

[0051] calculating a roll paper wound amount at Step SS ₅ from the signals of the respective sensors that are read above. The calculation is performed according to the calculation method described in the outline description above. By this calculation, it is determined whether the winding amount of the roll paper is the whole amount or, for example, about half. When this calculation cannot be performed (NO)
Returns to step SS _3, and determine if the same condition as when reentering the special mode in Step SS ₇ when the operation is performed is released all, if all conditions are canceled, to control the proper tension in the step SS _8. Steps SS ₉ and SS ₁₀ are control for detecting slippage of the core tube, which will be described later.

[0052] Tension control in the step SS _8, for example when the roll paper winding amount total amount of (new), sets the DC voltage of maximum tension in 25V. Alternatively, when the winding amount is about half, it is set to about 20 V, and is set in advance to a value that does not cause a sudden change in tension.

[0053] When the control of the proper tension is performed back to the top of the flow, but a determination of the special mode in Step S ₀ again, proceeds here naturally process the normal mode to the [A] by the preliminary action .

[0054] When the flow to the normal mode proceeds inching mode switch 10 is switched manually, first the reading of previously set data in step S _1, subsequently the operative state of various sensors (S _2). Therefore, in this case, the normal operation of the packaging apparatus has started, and at the start of the operation, the tension is controlled by the DC voltage value appropriately set in the special mode.

Next, in steps S ₃ , S ₄ , and S ₅ , the length measurement sensor signal and the angle sensor signal are read in the same manner as in the special mode, and the roll paper winding amount is calculated. This calculation is also basically performed according to the calculation method described above. As a result, if the roll paper R that starts with winding amount of the total amount, as shown, each step _{S 6, S 8, S 10} , steps S ₇ according the determination of the winding amount in the S _12, S _9, S ₁₁ , S ₁₃
, The control to the DC voltage of 25V, 16V, 12V, and 8V is performed. The relationship between the winding amount and the DC voltage control is as shown in FIG.

[0056] After the tension control of either route through the above-mentioned steps has been performed, the presence or absence of slippage operation further core tube in this embodiment is performed in step S _14. This sliding operation is checked using the proximity switch 26 described above. The arrangement of the proximity switch 26 is as shown in FIG.
A combination of one proximity switch 26 and 16 protrusions (ferromagnetic material) has an angle of 22.5 ° as in the case of the angle detecting means using the Hall element sensor 25 as the angle sensor described above.
Pulse signals are obtained one by one.

It goes without saying that the two types of angle sensors may be the same type of sensor. The relationship between the pulse signal and the rotation angle for each rotation angle by such an angle sensor is shown in the time chart of FIG. As shown in the figure, a pulse signal from the slip detection sensor is obtained in synchronization with the pulse signal shown in the winding amount detection chart at the same timing unless the winding state of the core tube fluctuates due to tension.

However, if the rotational resistance of the motor brake 20 due to each of the above-mentioned DC voltages is not appropriate and, for example, the tension is slightly too high at a certain tension level N = 2, the roll paper R and the core tube P are strongly integrated. When it rotates and, for example, the position of the magnet 16 fixed to the ferromagnetic material 17 is shifted, the signal from the Hall element sensor 25 becomes 22.
A pulse signal is emitted at an angle of 5 °.
In some cases, the pulse signals do not come out at the next angular position.

FIG. 12 shows a change in the pulse signal when the above-described shift occurs. The pulse signal of the slip detection sensor shows a case where there is no pulse signal at positions C and D after one rotation, and a pulse signal is generated with a slight shift between D and A thereafter.

In this case, the slip is detected by detecting the absence of the pulse of the slip detection sensor at the position of one rotation C based on the winding amount detection sensor, and the tension is, for example, N = 2.
If the DC voltage at 16V is too large, the tension signal is alleviated to 14V by reducing the tension so as to adjust the tension to an appropriate value so that the pulse signal is output again at an arbitrary position past the position D. Become.

[0061] After going optionally control over tension deviation of the core pipe P as described above, the presence or absence of the remaining amount of roll paper check by a signal end sensor 31 in step S _16, the packaging sheet is terminated returns to the previous step S ₃ unless, to continue the control of the proper tension in accordance with the winding amount of the package sheet by repeating the above operation.

When the end sensor 31 detects the end of the packaging sheet S, the tension control ends based on the signal.
However, if it is desired to continue the packaging operation, it is needless to say that the mode should be switched to the special mode, the roll paper R should be replaced with a new one, the paper splicing should be performed, and the above operation should be continued.

In the above description of the flowchart in the special mode, steps SS ₉ and SS ₁₀ are indicated by dotted lines. However, this is not always necessary in the special mode.
May be performed in the same manner as in Step S _14, S ₁₅ of the slip detection operation in the normal mode described above and to provide.

In the above description, the roll paper R has been described on the assumption that it is a product of complete full volume. However, for example, when a roll paper R having a roll volume of about half is set in the paper feeding unit, In the special mode, the tension state is controlled to a little larger than the tension control state in the normal mode when the tension state is reduced to about half by feeding out the full-length roll paper in advance, and then the normal mode is entered. It will be apparent that the normal mode can be smoothly entered without suddenly changing the tension state.

In the above embodiment, the sensor based on the combination of the proximity switch 26 and the plurality of protrusions 27 (16) is
Although it has been described that the "slip" of the core tube P with respect to the hollow shaft 1c is detected, this sensor can be used as an angle detection sensor instead of the sensor based on the combination of the magnet 24 and the Hall element sensor 25 described above.

The sensor based on the combination of the proximity switch 26 and the projection 27 detects the detection pulse as shown in FIG. 12 unless an abnormality occurs in the application of the braking force by the brake motor 20 (for example, the brake motor 20 stops due to a failure).
As shown in (1), the pulse signal is output at the same timing as the angle detection by the Hall element sensor 25, and therefore, the pulse signal may be used as it is as the angle detection signal.

However, when the signal from the proximity switch 26 is used as an angle detection sensor, the angle detection sensor using the Hall element sensor 25 is naturally omitted. In this case, the angle detection sensor by the proximity switch 26 performs angle detection and is also used as a slip detection sensor, but a signal serving as a reference is required when slip is detected as the slip detection sensor. It is assumed that the signal of the rotary encoder 32 is used as the reference signal.

When the braking force is abnormal, the hollow shaft 1c and the flange 15 thereof stop together with the brake motor 20, so that slippage occurs between the core tube P and the flange 15, but the paper is fed to some extent. This is because as long as the signal is generated by the rotary encoder 33 and the pulse signal of the proximity switch 26 does not match the pulse signal, a slip occurs.

[0069]

As described in detail above, the magnet arrangement of the roll paper for drug packaging of the present invention used in the drug packaging apparatus.
Structure, because I shall permit adjustment of the seat tension by detecting a magnet sheet winding amount of the roll paper for drug packaging is disposed at a position that can be detected by an angle sensor of the support shaft, the magnet arrangement of a simple structure The use of the structure in a drug packaging apparatus has the advantage that the packaging operation can achieve a packaging operation without ear slips and tears.

[0070]

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main configuration of a paper feeding unit and a packaging unit of a packaging device.

FIG. 2 is a vertical cross-sectional view of a paper feeding unit on which roll paper is mounted.

FIG. 3 is a schematic block diagram of a control circuit of a tension adjusting device for a packaging sheet.

FIG. 4 is a side view of the sheet feeding unit viewed from the direction of arrows IV-IV in FIG. 2;

FIG. 5 is a side view of the sheet feeding unit as viewed from the arrow VV in FIG. 2;

FIG. 6 is a schematic configuration diagram of an angle sensor.

FIG. 7 is a schematic layout diagram of another modified example of the angle sensor.

FIG. 8 is a diagram for explaining the principle operation.

FIG. 9 is a flowchart illustrating a special mode operation.

FIG. 10 is a flowchart for explaining a normal mode operation of the embodiment.

FIG. 11 is a graph showing a relationship between a DC voltage and a winding amount in the above calculation mode.

FIG. 12 is an explanatory diagram of a method of detecting a sliding action by a slip detection sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support shaft 2 Feed roller 3 Feed roller 4 Triangle plate 5 Hopper 6 Heating roller 7 Printer 20 Motor brake 25 Hall element sensor 26 Proximity switch 30 Control circuit 31 End sensor 32 Rotary encoder 33 Revolution counter S Packaging sheet P Core pipe R Roll paper W packaging sheet

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naomichi Eto 3-3-1 Meishinguchi, Toyonaka City Inside Yuyama Works, Ltd. (72) Inventor Hirokazu Amano 3-3-1 Meishinguchi, Toyonaka City Yuyama Works, Ltd. (56) References JP-A-8-198206 (JP, A) JP-A-63-262365 (JP, A) JP-A 4-135546 (JP, U) JP-A 62-10613 (JP, U) 61-45074 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65H 23/18-23/198 B65H 26/06-23/198 B65B 41/00-41 / 16

Claims (2)

(57) [Claims] A hollow shaft is rotatably provided around a support shaft supported non-rotatably, a motor brake is engaged with the hollow shaft, and a sheet of roll paper detachably mounted on the hollow shaft is fed. A feeding unit that feeds out the sheet by a roller, and a heating roller that folds the sheet into two and feeds the medicine from a hopper between the folds and heat-seal the sheet with the medicine in a width direction and both side edges at predetermined intervals in a band shape. And a wrapping section, an angle sensor is provided on the support shaft to detect the rotation angle of the roll paper, and a length measuring sensor that measures the sheet feeding length on the sheet feeding path to the separating section is provided. Means for rotatably joining the hollow shaft are provided at the end where the roll paper and the hollow shaft are in contact, and the medicine is packaged while adjusting the sheet tension according to the diameter of the roll paper based on signals from both sensors. medicine Used agent packing apparatus, in order to impart a sheet tension corresponding to the winding amount of the seat b Rupepa the hollow shaft, the non-rotation of the support shaft for rotatably supporting the hollow shaft
Where the angle of the sheet can be detected by the angle sensor
Of a roll paper for drug packaging, which has a magnet placed
Arrangement structure. 2. The roll paper for medicine packaging according to claim 1, wherein a magnet arranged at a position where the angle of the sheet can be detected by the angle sensor is detachably mounted on a hollow shaft. Arrangement structure of magnets.