KR100425267B1 - Medicine packing apparatus - Google Patents

Abstract

Even when the sheet roll diameter gradually decreases as the sheet is fed from the paper roll installed in the paper feed unit to the packaging unit, misalignment of the edges of the folded sheet by smoothing the sheet feeding and keeping the tension fluctuation to a minimum It is desirable to prevent this. A sheet length measuring sensor or rotary encoder is provided in a paper conveying path through which a packaging sheet drawn from the paper roll is conveyed toward the packaging unit. The angle sensor includes a Hall element sensor provided on the support shaft and a magnet provided on the core pipe of the paper roll. The signal from one of these sensors is changed with respect to the signal from the other sensor used to calculate the roll length, and the seat tension is optimal by adjusting the seat braking force step by step according to the roll diameter measured by the sensor. Can be adjusted to a constant level.

Description

Pharmaceutical Packaging Device {MEDICINE PACKING APPARATUS}

The present invention relates to a device for stepwise adjusting the tension applied to the sheet drawn out from the seat roller in accordance with the diameter change of the seat roller.

Conventional pharmaceutical packaging apparatus includes a sheet conveying unit for rotatably supporting a rolled sheet of heat-sealing packaging paper and a sealing device provided in a conveying passage through which the packaging sheet is fed and conveyed. When the sheet is folded in half upstream of the sealing device and the medicine is supplied, the sheet is heat-sealed along the edge in the width direction by the sealing device to seal the medicine.

When the packing sheet is used up, a new paper roll is installed in the paper transfer unit and the new sheet is drawn out and transferred. When this sheet is conveyed, the sealing position must be pulled uniformly so that it will not be deflected due to incorrect folding of the sheet. In practice, however, the tension applied to the sheet changes gradually as the diameter of the paper roll changes gradually as the sheet is fed.

Japanese Patent Application Laid-open No. Hei 1-36832 discloses a sheet tension adjusting device capable of applying a uniform tension to a sheet even when the diameter of the seat roll changes. The seat tension adjusting device disclosed in this publication has a roll supporting cylinder on which a seat roller is detachably mounted.

A plurality of roll diameter detection sensors are provided on the seat roll side. The signals from these detection sensors are used to control the electromagnetic forces generated by the electromagnetic brakes provided in the roller support cylinders so that the braking force is gradually reduced as the roller diameter is reduced.

In this conventional sheet tension adjusting device, the length of the sheet on the roll that changes as the sheet is fed is detected in stages by a roll diameter sensor arranged in the radial direction of the roll. Therefore, when the roll diameter is reduced at the point where the detection sensor rank is changed, the braking force rank of the electromagnetic brake fluctuates up and down every revolution due to the deflection of the axis of the core axis, the weight of the seat or the winding deformation.

If this happens, the edges of the sheet may not be aligned correctly when the sheet is folded in half. Thus, complete packaging is not possible. Since the braking force rank changes abruptly, the sheet may tear in the width direction.

The light reflection type detection sensor has a problem that a malfunction may occur. Packaging sheets used in pharmaceutical packaging devices include translucent or transparent hot melt paper and many other types of paper. When the end position of this sheet changes, the light is reflected differently, making it impossible to detect the reflected light as a signal. This lowers the detection accuracy. Moreover, they tend to meander under the effects of moisture changes. Detection field density may be lowered due to irregular end faces.

The thermal printer is usually provided upstream of the position where the sheet is folded in half to print the packaging sheet. When the sheet is vibrated, the printing dot may be chipped or the durability of the remaining indicator lamp may be degraded.

Apart from this problem, it provides a function to detect the breakage of the seat when the seat is used up from one roll, or when the seat is broken due to excessive braking force, so that various devices with tension adjusting device do not stop working. It is necessary to remove the tension and to not affect the tensioning operation itself. However, the conventional tension adjusting device does not have this function.

An object of the present invention is to provide a suitable tension according to the diameter of a paper roll on which an extremely thin sheet is wound by setting the braking force at every step without generating a level change of the braking force selected in a stepwise manner due to the influence of a slight change in the diameter of the paper roll. By providing a sheet tension adjusting device that can be applied to the sheet conveying portion stably, the sheet can be processed without any trouble and also to overcome the breakage of the sheet.

1 is a partial schematic view of a packaging unit and a paper conveying apparatus of the packaging apparatus;

2 is a longitudinal sectional view of a paper conveying unit equipped with a paper roll;

3 is a schematic block diagram of a control circuit of a tensioning device for a packing sheet;

4 is a side view of the paper conveying apparatus viewed from the direction of arrows IV-IV of FIG. 2;

5 is a side view of the paper conveying apparatus viewed from the direction of arrow V-V of FIG. 2;

6 is a schematic diagram of an angle sensor;

7A-7D are schematic views of different types of angle sensors,

8a and 8b is a view showing the basic function of the tension adjusting device,

9 is a flow chart showing a special operation mode,

10 is a flow chart showing a normal operation mode,

11 is a graph showing the relationship between the applied DC voltage and the wound length during the special mode;

12 is a diagram illustrating a method of detecting a slip by a slip detection sensor;

13 is a flowchart for explaining a function of detecting a break in a sheet, and

14 is a diagram for explaining how a signal from a sensor is used.

According to the present invention, there is provided an apparatus for adjusting the tension of a sheet conveyed from a paper roll mounted on a roll support cylinder rotatably mounted on a support shaft to a sheet processing portion, the apparatus being roll supported to apply a braking force. Measured by one of the brake means engaging with the cylinder, an angle sensor for detecting the rotational angle of the roll supporting cylinder, a seat length sensor for measuring the conveying length of the sheet on the sheet conveying path to the sheet processing part, and any one sensor Constant and stepwise method of calculating the diameter of the roll or the current seat length or diameter based on the seat length or rotation angle and the DC voltage applied to the brake means according to the diameter of the roll to control the braking force of the brake means. Tension adjusting unit to adjust the tension in the sheet conveyed to the sheet processing part And the sheet length to either or both of the sensor and the angle sensor is based on the presence or absence of generating a signal includes a control unit consisting of a sheet as dead detection means for determining the dead of the sheet.

In this seat tension adjusting device, two sensors, namely a seat length sensor and an angle sensor, are used. When the detection signals from the two sensors are received, the change in the wound amount can be directly obtained from the signal change of one sensor using the predetermined amount of the other sensor as a reference.

By associating a predetermined range of the change in the roll length with the change in the roll diameter in advance, it is possible to detect the change in the roll length and to simply select the stepwise control level of the braking force. Therefore, it is possible to adjust the sheet tension to an optimum level every step by controlling the braking force according to the roll diameter.

In this case, each rank of the braking force is switched from a large value to a small value within a range where the sheet processing is not affected by the tension change when the braking force is changed in a stepwise manner. Therefore, in the conventional apparatus in which the wound diameter of the paper roll is directly detected by the sensor, the range of the braking force changes rapidly near the diameter due to the irregular winding of the braking force, but there is no such problem in the apparatus of the present invention. .

In addition, the fact that the sheet is broken when signals from two sensors, namely the seat length sensor and the angle sensor, are input to the control unit is determined by the judgment unit based on the presence of the signals from the two sensors separately from the operation of the tension adjustment. Judging. Based on the result of the determination, the sheet feeding is stopped or the tension adjusting device is stopped.

Other features and objects of the present invention will become apparent from the following description with reference to the accompanying drawings.

Embodiments of the present invention are described with reference to the drawings. 1 is a schematic diagram of a medicine packaging apparatus mainly showing a paper conveying unit and a packaging unit. The paper transfer unit has a support shaft 1 on which the core pipe P, on which the roll R of the pharmaceutical packaging paper sheet S is wound, is rotatably mounted. The sheet S is taken out and conveyed to the packaging unit through the conveying rollers 2 and 3.

In the packaging unit, the sheet is folded in half by the triangular plate 4. The medication falls into the space formed in the folded sheet. The sheet is then heat-sealed in the width direction along both edges at predetermined intervals by heating the roller 6 with holes. Although the packaging unit includes many other parts, only the main parts are shown for simplicity.

Fig. 2 is a partial longitudinal sectional view of a paper conveying unit in which a roll paper R and a core pipe P are installed. As shown, the support shaft 1 has a central shaft 1a having one end fixed to the support plate 11 by a nut, an outer shaft 1b integrally mounted around the central shaft 1a, and an outer shaft. It includes a hollow shaft (1c) rotatably mounted on the outer shaft (1b) through a bearing (12) rotatably provided near both ends of (1b).

The central shaft 1a has the shaft head 13 at one end. The outer shaft 1b has a flange 14 at the same end. The hollow shaft 1c has a flange 15 at the other end. The core pipe P and the roll paper R mounted on the hollow shaft 1c are rotatable about the support shaft 1. A plurality of magnets 16 are provided on the inner circumferential surface of the flange 15 at appropriate intervals. The ferromagnetic (convex) member 17 is provided along the circumference of the end face of the core pipe P. The magnet 17 pulls the ferromagnetic member 17 to detachably mount the core pipe P and the roll paper R on the hollow shaft 1c.

The packaging sheet S drawn out from the roll paper R is properly tensioned by the motor brake 20 engaged with the hollow shaft 1c. The motor brake 20 mounted on the support plate 11 is connected to the gear unit 21 through an electric belt (not shown). The gear unit 21 has an output shaft on which the pinion 22 is mounted in engagement with the large gear 23 provided on the outer circumferential surface of the flange 15. Therefore, by operating the motor brake 20, the braking force is applied to the hollow shaft 1c.

The motor brake 20 is a small AC motor supplied with a DC voltage. As will be described below, the braking force can be changed in four stages according to the tension in the packing sheet S which is fed by changing the applied DC voltage in four stages.

As shown in FIG. 3, the control unit 30 includes a rotation angle sensor including four magnets 24, four Hall element sensors 25, and a sheet displacement sensor including a proximity switch 26 and a protrusion 27. Receive a signal from

In particular, the control unit calculates the length of the sheet S fed from the paper roll R and adjusts the tension applied to the sheet based on the sheet length sensor signal and the signal from the rotation angle sensor of the first embodiment. Adjust the braking force corresponding to the change of diameter in R).

As shown in Fig. 6, the four magnets of the second embodiment are provided on the inner circumferential surface of the core pipe P at an interval of 67.5 ° from the axial circumference of the pipe P, while the four Hall element sensors Reference numeral 25 is provided at one end of the support shaft 1 at equally angled intervals of 90 ° around the axis of the pipe P.

The number and positions of the magnets 24 and the sensors 25 are not limited to those shown in FIG. 7 shows changes in the number and arrangement of these. In some variations, the Hall element sensor or sensors 25 generate a pulse signal each time the core pipe P rotates at 22.5 °.

Also, instead of the combination of the magnet 24 and the hall element 25, an optical sensor can be used to detect the rotation of the core pipe P. The optical sensor includes a light emitting diode and a photoreceptor and is fixed to one end of the support shaft 1 (outer shaft 1b) in the same manner as the hall element.

More specifically, the optical sensor is mounted on an extension or mounting sheet provided on the flange end of the outer shaft 1b while the core pipe is spaced at an angle of 22.5 ° to pass between the light emitting diode of the optical sensor and the light interrupter. Is provided on (P). The number of light sensors and protrusions is the same as that of the Hall element 25 and the magnet 24.

Fig. 3 schematically shows a block diagram of a circuit for controlling various parts of the apparatus for transferring the packing sheet from the paper conveying unit and the packing agent. The control unit 30 is a signal from the end sensor 31, a signal from the rotary encoder 32 provided near the transfer roller 3, and a motor 6a connected to one axis of the heating roller 6. Receives a signal from the speed counter 33 mounted on the output shaft and generates an output for operating the motor brake 20 or the motor 6a based on one of the signals. Reference numeral 34 denotes an external data input. Represents an input unit to be used.

FIG. 5 is a side view seen from the direction of arrows IV-IV of FIG. 2 and shows the position of the displacement detection sensor mainly for packing the sheet. In this example, a single proximity switch 26 is provided on the support plate 11. Sixteen protrusions 27 are provided on the flange 15 of the rotatable hollow shaft 1c of the support shaft 1.

If there is a difference in pitch between the rotation angle sensor signal detected by the Hall element sensor 25 and the signal detected by the displacement detection sensor, the control unit determines that there is a displacement.

In the pharmaceutical packaging apparatus, the medicine is packaged while adjusting the sheet tension in the following manner.

In this embodiment, the maximum diameter d _max and the minimum diameter d ₀ of the roll paper R set in the paper feed unit are known in advance. As shown in FIG. 8, the braking force generated in the motor brake 20 is changed in four stages according to the signal from the rotary encoder 32 to adjust the braking force according to the change of the diameter of the paper roll R to obtain a suitable tension. Apply to.

The illustrated roll paper R has a maximum diameter d _max = 160 mm, a minimum diameter d ₀ ≒ 64 mm and a sheet thickness γ = 30 μm. In this case, the braking force generated by the motor brake changes each time the diameter of the paper roll R decreases (160-64) / 4 = 24 mm.

The length L of the sheet forming the roll R having a predetermined diameter is determined by the following formula.

Where n is the number of revolutions

The diameter of the roll R is determined as follows.

d _max = d ₀ + 2 × nγ ... (2)

From the formula (1), when the roll diameter is the maximum, the length L _max of the sheet forming the roll (R) is

L _max = [64 × n + n (n + 1) × 30 n × 10 ^-3 ] π

From formula (2), d _max = 64 + 2 × 30n × 10 ^-3 = 160 (mm)

Thus, n = 96/6 × 10 ^-2 = 1600

So, L _max = (64 + 1601 × 30 × 10 ^-3 ) × 1600π

= 562,688 (m)

Divide the diameter of the roll paper into four levels N = 1 (largest), 2 (largest second), 3 (largest third), and 4 (smallest). The maximum seat length of the roll at each stage is determined by the formula:

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)

8A and 8B, the number and arrangement of the magnet 4 and the Hall element sensor 25 are different from those of the above embodiment for the convenience of operation description. But the basic operation is the same in that one pulse signal is generated every 22.5 ° rotation.

As shown in Fig. 8A, when the radius of the paper roll is large, the angle sensor generates a small number of pulses while the packing sheet is fed by the length (1). As the paper roll radius decreases as shown in Fig. 8B, the number of pulses increases. If the number of pulse rolls is maximum and minimum, and the number of pulses is 3 and 10, respectively, the range of pulses from 3-10 can be applied to the D / C current to apply the appropriate tension corresponding to each step to adjust the braking force. To the motor brake 20 is divided into four steps.

The relationship between the tension level N = 1-4 and the number of pulses is as follows. If the maximum and minimum diameters of the paper roll R are 160 mm and 64 mm, respectively, the length of the sheet fed from the roll when the roll diameter is maximum is π × 160 mm. Since the angle sensor 25 generates one pulse signal every 22.5 degrees rotation (16 pulses per revolution), the sheet is fed by π 160/16 = 314 m / m. For an ejection length of 3140 m / m, the number of pulses is 10.

When the diameter of the roll is minimum, the relationship between the length of the drawn sheet and the number of pulses is as follows. That is, since π x 64/16 = 129.5 m / m, the pulse number is 3140/1295 x 10 = 24.2 for the feeding length of 3140 m / m.

At each tension level, the number of pulses and the DC voltage are determined as follows.

Tension Level N Pulse Number DC Voltage

N = 1 10-13 25Ⅴ

N = 2 14-17 16Ⅴ

N = 3 18-21 12Ⅴ

N = 4 22-24.2 8Ⅴ

In the above description, the tension level N is adjusted according to the number of pulses for the predetermined feeding length of the sheet. However, the tension level can be determined based on the drawn length of the sheet when a predetermined number of pulses is generated. Moreover, the detailed description of this method is as follows.

9 and 10 are flowcharts showing the operation of the tension adjusting device. In particular, Fig. 10 is a flowchart of a special mode achieved before the normal mode of the tension adjusting device. 10 is a flowchart of a normal mode.

In the special mode shown in Fig. 9, the control unit checks various states for normal packaging operation in the packaging unit so that the normal mode can be smoothly achieved. The packing sheet must be correctly installed in the packing unit before normal packing operation. The packing sheet is installed by inching operation manually. The control mode passes through this special mode.

In step S ₀ , the control unit determines whether one of the following conditions is present: the current mode is a special mode. The special mode is started when the end sensor or joint seal is activated, the inching mode is detected or the reverse direction of the wound length sensor is matched. The joint seal is operated while one sheet is used up and a new roll is installed and connected to the preceding sheet.

The inching mode is started by switching in the control unit before the start of every operation and the packaging sheet is manually installed in the manner described above.

Special mode is necessary because the new complete media roll is not always installed, but because there is a possibility that half the diameter of the used roll media, for example a new roll, is installed. If the roll set is half the diameter of the new paper roll, the tension is initially adjusted to an intermediate level smaller than the tension corresponding to the diameter of the new roll.

If the current mode is determined to be a special mode in step S ₀ , the tension level is set to the maximum level in step SS ₁ , and various sensors (reference sensor, speed counter, wound length sensor corepipe slip sensor) are activated ( Step SS ₂ ). In this state, the packing sheet is conveyed little by little by manual inching operation and reads signals from the sheet length sensor or rotation encoder 32 and the angle sensor or hall element sensor. In step SS ₅ , the control unit calculates the sheet length of the paper roll based on these signals using the above-described formula to determine whether the roll is the maximum diameter or not, for example, half the maximum diameter. If no calculation is possible (NO), step SS ₃ is executed again. If possible, the control unit determines in step SS ₇ whether all conditions for re-entering the special mode have been released. If these conditions exist, the tension is adjusted to the appropriate level in step SS8. Steps SS ₉ and SS ₁₀ are steps for detecting slip of the core pipe, which will be described later.

During the tension adjustment in step ₈ , the DC voltage corresponding to the maximum tension is set to 25V when the paper roll is the maximum diameter (new) and about 20V when the diameter of the paper roll is about half the maximum diameter. Prevent it.

When the tension is adjusted to an appropriate level, the program returns to step S ₀ to determine whether to execute the special mode operation again. At this time, the program proceeds to the normal mode [A].

In the normal mode shown in FIG. 10, the inching mode switch is manually switched and then the data set in advance in step S ₁ are read out, and the various sensors are kept in operation (S ₂ ). By this time the normal operation of the packaging unit has begun. At the start of normal operation the tension is controlled to the value of the DC current set appropriately for the special mode.

Then, in steps S ₃ , S ₄ , and S ₅ , the sheet length signal and the angle sensor signal are input in the same manner as in the special mode to calculate the sheet length of the roll. This calculation is accomplished in substantially the manner described above. When the roll (R) is determined as a full roll that is not used as a result of calculating the DC voltage step in the same way as the first embodiment, _{S 6, S 8, S 10} , and according to the judgment of S ₁₂ step S _7, S ₉ , S ₁₁ or S ₁₃ is set to 25V, 16V, 12V or 8V. 11 shows the relationship between the wound length described above and DC voltage control.

After the tension control is achieved via any of the routes described above, the control unit determines whether the core pipe slips in step S ₁₄ based on the signal from the proximity switch 26. As shown in Fig. 5, the switch 26 is provided opposite the sixteen ferromagnetic protrusions and generates a pulse signal whenever the core pipe rotates exactly 22.5 degrees in the same manner as the Hall element angle sensor 25.

In this embodiment, the angle sensors 25 and 26 are different types but may be the same type. The time chart of FIG. 12 shows the relationship between the pulse signal generated by the angle sensor and the rotational angle. As shown, the pulse signal by the slip detection sensor can be obtained synchronously with the pulse signal by the wound length detection sensor if the wound state is not changed by tension.

However, if the rotational resistance of the motor brake 20 generated by each of the above-described DC voltages is inappropriate, for example, if the tension is as large as the tension level N = 2, the paper roll R rotates strongly with the core pipe P. do. This generates a displacement at the point where the ferromagnetic member 17 is attracted to the magnet 16. When this occurs, the proximity switch 26 can generate two pulse signals at the same time, even if the Hall element sensor 25 maintains the generation of the pulse signal at a constant angled interval of 22.5 °, and the core pipes are different at 22.5 °. It does not generate a signal when rotating.

Fig. 12 shows how the pulse signal changes when such position displacement occurs. As shown, the slip direction sensor does not generate a pulse signal at positions C and D after the core pipe is completely returned. Instead, a pulse signal is generated between D and A with some displacement.

In such a case, the control unit can determine whether or not the pulse detection signal is generated at the position C by referring to the signal from the length detection sensor in which the slip detection sensor is wound. For example, if the DC current of 16 V is too high at level N = 2 so that the tension is also high, the voltage can be reduced to 14 V to adjust the tension to an appropriate level. In this voltage regulation, a pulse signal can be generated at any desired position behind position D.

After adjusting any positional displacement of the core pipe P due to the change in sheet tension, the control unit checks in step S ₁₆ whether the paper is still wound on the pipe P based on the signal from the end sensor 31. . If the sensor 31 does not detect the end of the sheet, the operation of step S ₃ is executed, that is, the sheet tension is controlled in accordance with the wound length of the sheet roll by repeating the above calculation. The tension control mode ends when the end sensor 31 detects the end of the packing sheet S. FIG. If a subsequent packaging is then required, the program replaces the roll R with a new roll and returns to the special mode to connect the seat end.

Steps SS ₉ and SS ₁₀ are shown in dashed lines in the flow chart for the special mode, which means that this step is not necessary. If this step is provided, these functions are the same as steps S ₁₄ and S ₁₅ of the slip detection operation in the normal mode.

The above description is made on the assumption that the paper roll R is the entire roll. If a roll of half the maximum diameter is installed in the paper feeder, the normal mode starts after the tension is adjusted in the special mode to a level slightly larger than the tension in the normal mode when the entire roll is fed to about half the maximum diameter. . It is possible to start the normal mode smoothly without the possibility of a sudden increase in tension.

In the description of the above embodiment, we describe a sensor assembly comprising a proximity switch 26 and a projection 27 as a sensor for detecting the slip of the pipe P about the hollow shaft K. However, this sensor assembly may be used instead of the sensor assembly including the magnet 24 and the Hall element sensor 25 as the angle detection sensor.

The sensor assembly including the above-mentioned proximity switch 27 and the protrusion 27 has a Hall element sensor as shown in FIG. 12 unless an abnormal braking force (for example, due to a failure of the motor brake) is applied from the motor 20. 25), the pulse signal output is maintained at the same timing as the angle detection. Therefore, it is possible to use this pulse signal as an angle detection signal.

If the proximity switch is used as the angle detection sensor, the Hall element sensor used as the angle detection sensor is unnecessary and can be omitted. In this case, the angle sensor including the proximity switch 26 acts as an angle sensor and a slip detection sensor. In order for such a sensor to act as a slip detection sensor, a reference signal is required. Such a reference signal can be provided by the rotary encoder 32.

When the abnormal braking force is applied from the brake motor 20, that is, when the brake motor 20 is stopped, the hollow shaft K and its flange 15 are stopped. Thus slip occurs between the pipe P and the flange 15. The rotary encoder 33 generates a signal when the paper is conveyed even slightly in this state. The proximity switch 26 can thus detect that the pipe slips against the flange from the fact that the pulse signal from the encoder 33 does not match the pulse signal from the proximity switch 26.

In this embodiment, the angle detection sensor and the wound length sensor are both used to determine the wound diameter. However, it is possible to detect whether the sheet is broken by using a number of these sensors. This function can cause the sheet conveying to the packaging device to break due to the fact that the sheet tension adjusting device of each embodiment is used in the pharmaceutical packaging device and also due to excessive braking force applied thereto or due to the fact that one of the sheet rolls is used up. Because it is available.

In this embodiment, the feed length is detected by the rotary encoder 32. Based on the detected conveying length, the length of the sheet wound on the roll is calculated. Thus, the amount of the wound amount is calculated to adjust the braking force based on the wound length calculated by the pulse signal of the angle detection sensor or hall element sensor 25. The displacement of the core pipe P with respect to the flange 15 is also detected by the proximity switch 26 as a movement detection sensor. The signals from these sensors can be used to detect sheet breaking in the following manner. There are two cases in which breakage of the sheet is detected.

In the first case, the sheet is broken between the paper roll R and the rotary encoder 32. In this case, one or neither of the angle sensor by the Hall element sensor 25 and the displacement detection sensor by the proximity switch 26 generates a pulse signal, but the rotary encoder 32 measures the sheet feed length measurement signal. Generates.

In this case, the control unit 30 can determine that the sheet is broken by the addition of a program that determines that the sheet is broken. Based on this determination, the control unit 30 transmits a control signal to the motor 6a of the heating roller 6 to stop the heating roller 6 and also transfers the medicine to the packaging device to stop the delivery of the medicine. The control signal is transmitted to the feeder. The fact that the sheet is broken is shown on the display (not shown).

In Fig. 3, the rotary encoder 32 is mounted on the shaft of the feed roller 3. The illustrated roller 3 is a pair of rollers for conveying the sheet by sandwiching the sheet between the rollers. One of the rollers is driven by a motor not shown. The rotary encoder 32 is mounted on the axis of the other roller 3 which is not driven. The motor, not shown, is driven synchronously with the motor 6a for the heating roller 6. However, the motor not shown may be omitted and the transfer roller 3 may be driven through the belt by the motor 6a.

13 shows a flow chart of an embodiment with the above-described program for determining sheet pieces. As shown, steps S ₁₇ -S ₁₉ are inserted between steps S ₄ and S ₅ of the flow chart of FIG. 10. In S ₁₇ , it is determined whether the signals from the seat length sensor and the angle sensor are obtained. When this data is obtained, the program proceeds to S ₅ .

If no data is obtained (NO), the time is measured at S ₁₈ . If data is not obtained for a predetermined time, it is determined that the sheet is broken. Therefore, an error message is displayed and the above-mentioned driving control is stopped if necessary. The state of the sensor signal when such data is not obtained is shown in FIG. The state after which the sensor signal is not input is shown for the second time after the core pipe P. As shown in FIG. The above process is the same as the following case.

In the second case, the sheet is not conveyed at all. In this case, one or both of the angle detection sensor and the movement detection sensor between the three detection sensors and also the sheet feed length detection sensor by the rotary encoder 32 generate no signal at all, whereas shown in FIG. The rotation speed counter 33 may calculate the rotation speed signal. In this case, it is possible to detect the break of the sheet by providing a judgment program for determining that the sheet is broken. The control after determining that the sheet is broken is the same as in the first case.

The rotary encoder 32 may be provided on the axis of the conveying roller 3 or on the axis of the motor 6a for the heating roller 6 shown. The judgment program is exactly the same for both cases described above. If there is a sheet break in either of the two cases, the determination program is provided to determine that the sheet is broken if it is not detected by either the movement detection sensor or the angle detection sensor, while the signal is a rotation encoder 32 and the rotational speed. All of the counters 33 are detected. The control after determining that the sheet is broken is the same as in the first case.

In this embodiment, as shown in FIG. 2, the magnet 16 and the ferromagnetic member 17 are provided between the flange portion 15 of the hollow shaft 1c and the core pipe P so that the core pipe P is hollow. It applies to an arrangement which can be moved about the axis 1c (flange 15).

However, in this embodiment, instead of the magnet fixing means, a projection made of a magnet 16 and a ferromagnetic member 17 is provided on the flange portion 15 so that the core pipe P rotates with respect to the flange portion 15. Applicable to arrangements that cannot be moved in the direction. In this case, the displacement detection sensor is not provided because the core pipe P is not moved.

In this case, the proximity sensor 26 can be used as the angle detection sensor. Therefore, the angle detection sensor or the sensor including the Hall element sensor 25 is used. In this example, the detection signal is not generated by the angle detection signal even if the sheet breaks in the middle or the sheet is not conveyed at all. Therefore, the fact that the sheet is broken depends on whether the rotary encoder 32 is mounted on the shaft of the roller 3 or the shaft of the motor 6a, and therefore the signal of the rotary encoder 32 and the rotation counter 33 generate a signal. It is detected by a program that determines what to do.

The sheet piece detection function by various sensors and judgment programs allows the device to stop while the sheet is being transferred when data such as the sheet length, the wound length, and the wound diameter are temporarily stored in the RAM. This is necessary because when the data is turned off, the intermediate data disappears and cannot be used at restart.

Therefore, if the final result is stored in the storage unit EEPROM free of input holding and erasing, the control result can be started from the correct operation sequence when the judgment result is not erased by reset.

According to the present invention the current wound length and the wound diameter of the roll are determined based on the signal change from one of the seat length sensor and the angle sensor for the signal from the other sensor, the seat tension being the braking force corresponding to the diameter. Is adjusted by selecting. Also, a piece of sheet can be detected in the presence or absence of signals from the sheet length sensor and the angle sensor. In this arrangement, it is possible to adjust the sheet tension by selecting the braking force corresponding to the current length determined based on the measured data, even if the data of the entire wound length is not known. Thus, it is possible to smoothly adjust the tension of the sheet without the possibility of a sudden change in tension. Also pieces of the sheet can be detected.

Claims (7)

A paper feed unit which freely installs the hollow shaft around the central shaft supported by non-rotation, engages the motor brake means on the hollow shaft, and feeds the sheet of roll paper wound on the core pipe mounted on the hollow shaft to the feed roller; And a packing unit for heat-sealing the sheet in the width direction and at both edges at predetermined intervals in a band shape, wherein the hollow shaft is provided with a magnet at one end thereof to adsorb and hold a magnetic substance installed in the core pipe. And a length measuring sensor that slides the core pipe along the circumference of the hollow shaft and freely rotates it, and measures the sheet conveying length on the sheet conveying path to the packaging unit, and a magnet installed in the core pipe at the other end of the hollow shaft. Angle sensor installed on the central axis to detect the rotation angle of the core pipe. On the basis of either the predetermined length or the predetermined rotation angle obtained from the sensor, the amount of roll paper wound and the wound diameter after feeding out by the change of the rotation angle or the sheet feed length are calculated, and based on the result of the calculation Pharmaceutical packaging device comprising a control unit for controlling a DC voltage applied to the brake means provided in the hollow shaft. The signal from the length measuring sensor and the angle sensor according to claim 1, wherein the control unit performs an inching operation for intermittently conveying a predetermined length of the sheet before the normal mode of adjusting the sheet tension during feeding the sheet. And a special mode for obtaining a rolled paper roll amount in the same manner as a normal mode, and controlling braking force according to the diameter of the rolled amount. 3. The control according to claim 1 or 2, wherein the angle sensor of the central axis is used as the first angle sensor, and the proximity switch for detecting the approach of the projection of the magnetic body provided on the hollow shaft is installed as the second angle sensor. And the unit judges that the core pipe is causing sliding about the hollow shaft when the detection signal from the first angle sensor is detected and there is no detection signal from the second angle sensor. An angle formed of a hollow core pipe of a predetermined length for winding a sheet of roll paper on the outer circumference, and a magnet provided radially inward from the inner circumferential surface of the sheet material on a non-rotating central axis for freely supporting the hollow core pipe. Hollow core pipe is formed by arranging the magnet at an angle set to calculate the amount of roll paper wound and the wound diameter by the sensor, and the hollow shaft is freely rotatably mounted around the central axis. The magnetic member provided along the end surface of the other end side of a hollow core pipe, and the rotation inserted into a hollow core pipe of Claim 4 which connects the said hollow core pipe to a hollow shaft so that joining rotation is possible. Hollow core pipe, characterized in that formed to be fixed by suction by a magnet installed on a free hollow shaft. Hollow core pipes of predetermined lengths to be wound around the outer periphery, and the amount and diameter of the wound rolls wound around the hollow core pipes can be calculated by the angle sensor installed on the fixed shaft. Characterized in that the magnets are arranged so that the magnets are rotated together with the seat roller so that the detection of the magnets is equally divided during at least one revolution of the hollow core pipe. Hollow core pipe. An angle formed of a hollow core pipe of a predetermined length for winding a sheet of a roll paper on the outer circumference, and a magnet provided radially inward from the inner circumferential surface of the sheet material on a non-rotating central axis for freely supporting the hollow core pipe. The sensor is placed at an angle set to calculate the amount of the roll paper wound and the wound diameter, and is installed to be rotatable with the hollow shaft, which is freely mounted around the central axis, and is seated on the outer periphery of the hollow core pipe. Combination of hollow core pipe and roll paper formed of rolled paper wrapped around.