KR100549889B1 - Method and apparatus for feeding sheets - Google Patents

Abstract

Provided is a sheet feeding method and a sheet feeding apparatus which can feed a sheet by drawing it while applying a predetermined predetermined tension to the sheet even if the diameter of the sheet master roll and the sheet feeding speed are changed.

In the sheet supply apparatus for pulling out and supplying the sheet 6 in a tension state while applying a braking force to the sheet master roll 5, a drive shaft 8 for applying a driving force to pull out the sheet from the sheet master roll 5, And a tension imparting device that applies a braking force to the rotation of the sheet disc roll 5 so as to keep the sheet 6 to be drawn out in a tensioned state. The tensioning device includes a pulse generator for detecting the rotational speed of the drive shaft 8 and the disc roll 5, a variable brake 12 whose braking force changes when the amount of electricity supplied changes, and a supply to the variable brake 12. The brake control apparatus which changes the electric quantity to change according to the change of the ratio of the rotation speed of the drive shaft 8 and the rotation speed of the sheet master roll 5 is provided.

Description

Sheet feeding method and apparatus {METHOD AND APPARATUS FOR FEEDING SHEETS}             

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the structure of the sheet | seat supply apparatus from the sheet raw roll which concerns on one Embodiment of this invention.

Explanation of symbols for the main parts of the drawings

1: conveyor belt 2: sprocket

3: sprocket 4: pack

5: sheet disc roll 6: sheet

7: guide roller 8: drive shaft

9: chain 10: drive wheel

11 brake wheel 12 variable brake

13: chain 14: pulse counter

15 digital / analog converter 16 converter

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a sheet supply method and a sheet supply apparatus from a sheet master roll, in which a sheet such as a plastic sheet can be drawn out and supplied under a tension state having a predetermined tension from a sheet master roll.

In various packaging apparatuses, it is often required to take out sheets for packaging from a sheet master roll and to supply them under a predetermined constant tension. In particular, in the case of using a packaging sheet having various printings, it is necessary to match the position of the printing with the packaging, and when a deviation occurs in the packaging process, a mechanism for adjusting the conveyance of the sheet is provided. In general, when such an adjustment mechanism is provided, there is a problem that the adjustment mechanism does not function well unless the tension of the sheet to be supplied is a predetermined constant value.

In order to apply tension to the sheet to be supplied, one of the conventional methods has been to install a band brake on a disc shaft supporting the sheet disc roll to take the sheet out of the disc roll.

However, such a conventional band brake always gives a constant braking force to the disc shaft, so that if the diameter of the disc roll changes as the sheet is withdrawn from the disc roll, the disc roll changes from the disc roll according to the change of the diameter of the disc roll. As the tension acting on the sheet to be drawn out changes, and as the sheet is drawn out and the diameter of the disc roll becomes smaller, a larger tension acts on the sheet.

Irrespective of the change in the diameter of the disc roll, one of the conventional methods for maintaining a constant tension of the sheet drawn out from the sheet disc roll is a variable brake which changes the brake force generated by changing the electromagnetic force. By attaching and changing the amount of electricity applied to the variable brake so as to change the electromagnetic force in accordance with the change in the diameter of the sheet disc roll, there was a structure in which the brake force could be changed to exert a constant tension on the drawn sheet.

However, the apparatus of such a structure is comprised on the premise that the feed rate of a sheet | seat is constant, and since the rate of change of the diameter of a sheet disc roll changes when the feed rate of a sheet | seat is changed, the brake force acting on a sheet | seat changes and it acts on a sheet | seat. In order to maintain the tension at a predetermined constant value, adjustment is necessary again.

Therefore, in such a conventional apparatus, there is a problem that it is necessary to adjust the magnitude of the brake force each time the sheet feed speed is changed, and the adjustment of the brake force in this conventional apparatus is timely and skillful. It was necessary work.

According to the present invention, when the sheet is supplied in a tensioned state by taking out the sheet while applying the braking force to the rotation of the sheet disk roll, even if the diameter of the sheet disk roll changes, the sheet can be supplied while applying a predetermined predetermined tension to the sheet. Moreover, even if the feed rate of the sheet changes, the sheet feeding method and the sheet feeding apparatus which allow the sheet to be drawn out and supplied while always applying a predetermined tension to the sheet without changing the tension every time. The task is to provide.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, in the sheet | seat supply method which draws and supplies a sheet | seat in a tension state, applying a braking force with respect to a sheet | seat disc roll, the rotation speed of a drive shaft which gives the driving force which draws out a sheet, and a sheet disk According to the change of the ratio of the rotation speed of a roll, the said braking force applied with respect to the said sheet raw roll is changed, The sheet supply method from the sheet raw roll is provided.

In the sheet feeding method of the present invention, the change in the diameter of the sheet master roll can be known from the change in the ratio of the rotational speed of the drive shaft that imparts the driving force for extracting the sheet and the rotational speed of the sheet master roll, and is taken out from the sheet master roll. By applying the changed braking force in response to the change, the sheet is taken out so that a constant tension can always be applied to the sheet drawn out from the sheet disk roll even if the diameter of the sheet disk roll changes according to the consumption of the sheet disk. have.

In addition, since the braking force applied to the rotation of the sheet disc roll is changed in accordance with the change of the ratio of the rotational speed of the drive shaft for taking out the sheet and the rotational speed of the sheet disc roll, the sheet is taken out to change the take-out speed of the sheet. Even if the rotational speed of the drive shaft is changed, the ratio of the rotational speed of the driving shaft to take out the sheet and the rotational speed of the sheet disc roll is not affected by the speed change, and this ratio is changed according to the change of the diameter of the sheet disc roll. It is only possible to apply the changed braking force to the sheet master roll so that the tension of the sheet becomes constant in accordance with the change in the diameter of the master roll even if the takeout speed of the sheet is changed.

Moreover, this invention is a sheet supply apparatus which solved the said subject, Comprising: The braking force with respect to the rotation of the said sheet disk roll so that the drive shaft which gives the drive force which draws a sheet | seat out of a sheet disk roll, and the sheet | seat which are drawn out in tension state may be maintained. A sheet supply device having a tension applying device, wherein the tensioning device includes a variable brake in which a braking force changes when the amount of electricity supplied changes, and an amount of electricity supplied to the variable brake in terms of the rotational speed of the drive shaft and the sheet disk. A sheet feeding device from a sheet master roll is provided, which has a brake control device which changes according to a change in the ratio of the rotational speed of the roll.

In this sheet supply device, a tension applying device that applies a braking force to maintain a sheet drawn out from a sheet disc roll in a tensioned state, employs a variable brake in which the braking force changes when the amount of electricity supplied changes, Since the amount of electricity supplied to the variable brake is changed in accordance with the change in the ratio of the rotational speed of the drive shaft to the driving force for drawing out the sheet from the sheet disk roll and the rotation speed of the sheet disk roll, Irrespective of the change in the diameter of the sheet disc roll, a braking force changed in accordance with the change of the diameter of the sheet disc roll is applied to the sheet disc roll, and a predetermined constant tension can always be applied to the sheet drawn out from the disc roll, thereby implementing the sheet feeding method according to the present invention. It is a device that can be.

A brake control device employed in a sheet supplying apparatus according to the present invention, comprising: a first pulse generator for detecting the rotational speed of a sheet disc roll, and a second detecting the rotational speed of a drive shaft for applying a driving force to take out a sheet from the sheet disc roll If a pulse generator and a converter having a converter for generating an electric quantity changed according to a change in the ratio of the number of pulses generated by the second pulse generator and the number of pulses generated by the first pulse generator are employed, The braking force is preferable because it can be precisely digitally controlled so that it is always constant regardless of the change in the diameter of the sheet disc roll.

As described above, according to the sheet supply apparatus of the present invention, it is possible to provide the apparatus of the above-described sheet supplying method of the present invention accurately and easily and in a compact configuration.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates concretely according to one Embodiment which shows the sheet | seat feeding method and apparatus which concern on this invention.

Moreover, embodiment described below is a sheet made of a plastic film, in order to seal the edge of a pack and the overlap part of the sheet | seat by covering a sheet | seat made of a plastic film in the opening part of the pack, after filling an article in a pack. This invention is applied when it is made to draw and supply in a predetermined tension state with the driving force from the sheet | seat disk roll from a sheet disk roll.

In Fig. 1, reference numeral l denotes an endless conveyor belt, which spans around the sprockets 2 and 3, and the conveyor belt 1 faces the opening 4 at predetermined intervals for the pack 4 for filling and packing the article. It keeps in one state and conveys continuously.

In the pack 4 conveyed by the conveyor belt 1, a sheet 6 made of a plastic film taken out from the sheet disc roll 5 and rewound is coated on the opening of the pack 4, and the pack 4 It is sealed at the edge of the pack and the pack finished product is manufactured.

The sheet 6 drawn out from the sheet disc roll 5 is guided so as to be overlaid on the opening of the pack 4 via a plurality of guide rollers 7.

In order to seal the sheet 6 at the edge of the pack 4, appropriate means known in the art can be employed, so that the sealing mechanism or the like is not shown for the sake of simplicity, and the description is omitted. do.

The conveyor belt 1 of the endless is driven by the chain 9, the drive wheel 10, and the sprocket 3 by the power from the drive shaft 8, and is made of a plastic film sealed at the edge of the pack 4. The sheet 6 is taken out from the sheet master roll 5 by the driving force from this drive shaft 8.

On the other hand, a braking wheel 11 is attached to the disk shaft supporting the sheet disk roll 5, and the brake wheel 11 is attached via the brake wheel 11 so as to bring the sheet rewound from the sheet disk roll 5 into a tensioned state. The braking force is applied to the sheet disk roll 5 by applying a braking force to the driving wheel 11 and the coaxial disc shaft.

That is, the brake wheel 11 is connected with the variable brake 12 via the chain 13, and is comprised so that a braking force may be applied to the rotation.

The variable brake 12 has a configuration in which the magnetic force is changed by changing the amount of electricity (voltage or current) supplied, and the braking force is correspondingly changed, and is marketed in the name of powder brake, hysteresis brake, etc. These can be suitably selected and employ | adopted.

Rotating detectors (not shown), such as a rotary encoder, are attached to the disk shaft to which the drive shaft 8 and the brake wheel 11 were attached, respectively. By these rotary encoders, pulses are generated in accordance with the rotational speeds of the drive shaft 8 and the disc shaft and transmitted to the pulse counter 14 as indicated by the broken lines. In the pulse counter 14, the ratio of the pulses from the rotational speed detector such as the rotary encoder attached to the disc shaft to the pulses from the rotational speed detector such as the rotary encoder attached to the drive shaft 8 is calculated.

The ratio of the rotational speed of the drive shaft 8 and the disk shaft calculated by the ratio of the pulses to the pulse counter 14 is transmitted to the digital-to-analog converter 15, and the digital-to-analog converter 15 has a magnitude corresponding to the rotational speed ratio. Voltage is generated. The voltage output generated by the digital-to-analog converter l5 is transmitted to the converter 16 so that the amount of electricity according to the output is transmitted to the variable brake 12, and the brake force of the magnitude corresponding to the amount of electricity is variable variable brake 12. Is generated by

In addition, the magnitude of the brake force applied by the variable brake 12 is a change in the braking force that must be applied to give a predetermined tension to the sheet drawn out from the sheet disk roll whose diameter changes and the sheet disk roll whose diameter changes. Is determined in advance, and is adjusted by applying a changed amount of electricity to the variable brake 12 to generate its varying braking force.

In this way, the variable brake 12 generates a brake force of a magnitude corresponding to a change in the ratio of pulses from the rotational speed detectors such as rotary encoders attached to the drive shaft 8 and the disc shaft, respectively, so that the seat is consumed. When the rotational speed of the disc shaft increases as the diameter of the sheet disc roll 5 decreases, the braking force applied to the disc shaft from the variable brake l2 becomes small, and is applied to the sheet wound and supplied from the sheet disc roll 5. The losing tension is controlled to be a predetermined constant value.

As described above, the variable brake 12 generates a braking force of a magnitude corresponding to a change in the ratio of the rotational speed of the drive shaft 8 and the disc shaft, so that the feed speed of the seat 6 is changed to change the packing speed of the pack. Even if the rotational speed of both the drive shaft 8 and the disc shaft changes by changing, the ratio of the rotational speed of the drive shaft 8 and the disc shaft is not affected by the change of the rotational speed, but the change of the diameter of the sheet disc roll 5 The brake is changed by the variable brake 12 in accordance with the change in the ratio of the rotational speed according to this, and a constant braking force is applied to the sheet to be drawn out.

Therefore, each time the packaging speed is changed, there is no need to adjust the braking force applied to the sheet master roll 5 so that the tension applied to the sheet to be rewound and fed out from the sheet master roll 5 becomes a predetermined constant value. .

In the pack packaging apparatus of the above-described embodiment, as shown in Table 1, after setting the packing speed to 1200 pieces per hour and the tension applied to the sheet (film) to be drawn out to 0.6184 / kgf, the packing speed is set to 2200 hours per hour. In the case of changing to 3600 pieces and 3600 pieces, measured values such as tension applied to the sheet are shown in Tables 2 and 3, respectively.

As shown in Tables 1 to 3, it is understood that a predetermined constant tension is applied to the sheet even when the take-out speed is changed.

Packing speed 1200pcs / h Disk diameter (mm) Rotation Ratio with Drive Shaft Brake torque (kgf / cm) Film tension (kgf) 280 3.8480 4.3290 0.6184 270 3.7105 4.1744 0.6184 260 3.5731 4.0198 0.6184 250 3.4357 3.8651 0.6184 240 3.2983 3.7105 0.6184 230 3.1608 3.5559 0.6184 220 3.0234 3.4013 0.6184 210 2.8860 3.2467 0.6184 200 2.7486 3.0921 0.6184 190 2.6111 2.9375 0.6184 180 2.4737 2.7829 0.6184 170 2.3363 2.6283 0.6184 160 2.1988 2.4737 0.6184 150 2.0614 2.3191 0.6184 140 1.9240 2.1645 0.6184 130 1.7866 2.0099 0.6184 120 1.6491 1.8553 0.6184 110 1.5117 1.7007 0.6184 100 1.3743 1.5461 0.6184 90 1.2368 1.3915 0.6184

Packing speed 2200pcs / h Disk diameter (mm) Rotation Ratio with Drive Shaft Brake torque (kgf / cm) Film tension (kgf) 280 3.8480 4.3290 0.6184 270 3.7105 4.1744 0.6184 260 3.5731 4.0198 0.6184 250 3.4357 3.8651 0.6184 240 3.2983 3.7105 0.6184 230 3.1608 3.5559 0.6184 220 3.0234 3.4013 0.6184 210 2.8860 3.2467 0.6184 200 2.7486 3.0921 0.6184 190 2.6111 2.9375 0.6184 180 2.4737 2.7829 0.6184 170 2.3363 2.6283 0.6184 160 2.1988 2.4737 0.6184 150 2.0614 2.3191 0.6184 140 1.9240 2.1645 0.6184 130 1.7866 2.0099 0.6184 120 1.6491 1.8553 0.6184 110 1.5117 1.7007 0.6184 100 1.3743 1.5461 0.6184 90 1.2368 1.3915 0.6184

Packing speed 3600pcs / h Disk diameter (mm) Rotation Ratio with Drive Shaft Brake torque (kgf / cm) Film tension (kgf) 280 3.8480 4.3290 0.6184 270 3.7105 4.1744 0.6184 260 3.5731 4.0198 0.6184 250 3.4357 3.8651 0.6184 240 3.2983 3.7105 0.6184 230 3.1608 3.5559 0.6184 220 3.0234 3.4013 0.6184 210 2.8860 3.2467 0.6184 200 2.7486 3.0921 0.6184 190 2.6111 2.9375 0.6184 180 2.4737 2.7829 0.6184 170 2.3363 2.6283 0.6184 160 2.1988 2.4737 0.6184 150 2.0614 2.3191 0.6184 140 1.9240 2.1645 0.6184 130 1.7866 2.0099 0.6184 120 1.6491 1.8553 0.6184 110 1.5117 1.7007 0.6184 100 1.3743 1.5461 0.6184 90 1.2368 1.3915 0.6184

As mentioned above, although this invention was concretely demonstrated based on one Embodiment, this invention is not limited to this Embodiment, Needless to say that various changes can be added within the scope of the invention as described in a claim. .

For example, in the above embodiment, in order to detect the rotational speed of the sheet disk roll, a rotational detector such as a rotary encoder is directly attached to the disk shaft, but the rotational speed of the sheet disk roll is attached to the sheet disk roll itself by attaching the rotational speed detector. The number can be detected, or can be attached to another shaft connected to the disk shaft and rotating at a speed proportional to the rotation speed of the disk shaft to detect the rotation speed of the sheet disk roll.

Moreover, in the said embodiment, although the pulse generator is employ | adopted in detecting the rotation speed of a sheet | seat disc roll, it is not limited to this, An appropriate rotation speed detector can be employ | adopted. In any of these cases, the ratio of the rotational speeds contrasted between the drive shaft side and the sheet disk roll side only changes depending on which rotational speed is detected.

In addition, in the said embodiment, although the braking force is applied with respect to the sheet | seat which is taken out, it is set as the structure which applies a braking force with a variable brake with respect to the disk shaft which supports a sheet disk roll, either directly to a sheet disk roll itself, or a disk. By applying a braking force to another shaft connected to the shaft, other suitable braking force applying means, such as indirectly applying a braking force to the sheet disc roll, can be used.

Moreover, in the said embodiment, although the rotation speed of the drive shaft 8 which applies the driving force which draws out a sheet is directly detected, the drive shaft 8 is indirectly detected by detecting the rotation speed of the other rotating shaft which rotates connected to the drive shaft 8 and rotates. The number of revolutions can be detected.

As described above, the present invention provides a sheet feeding method for drawing and feeding a sheet in a tension state while applying a braking force to the sheet disk roll, wherein the rotation speed of the drive shaft and the sheet disk roll that apply a driving force to pull out the sheet are applied. Provided is a method for supplying a sheet from a sheet master roll to change the braking force applied to the sheet master roll in accordance with a change in the ratio of rotational speeds.

In the sheet feeding method of the present invention, the change in the diameter of the sheet master roll can be known from the change in the ratio of the rotational speed of the drive shaft that gives the driving force to pull out the sheet and the rotational speed of the sheet master roll, By applying the changed braking force corresponding to the change to the sheet, the sheet is taken out so that a constant tension can always be applied to the sheet drawn out from the sheet disk roll even if the diameter of the sheet disk roll changes according to the consumption of the sheet disk. .

Moreover, in the sheet feeding method of the present invention, the braking force applied to the rotation of the sheet disc roll is changed in accordance with the change of the ratio of the rotational speed of the drive shaft for taking out the sheet and the rotational speed of the sheet disc roll, so that the sheet is pulled out. Even if the rotational speed of the drive shaft for taking out the sheet is changed to change the speed, the ratio of the rotational speed of the drive shaft for taking out the sheet and the rotational speed of the sheet disc roll is not affected by the speed change and this ratio Since it changes only with the change of the diameter of the disc roll, even if the take-out speed of the sheet is changed, the braking force changed so that the tension of the sheet becomes constant according to the change of the diameter of the disc roll regardless of the change of the take-out speed. Can be applied to a roll.

Moreover, this invention is a sheet supply apparatus which has the drive shaft which applies the driving force which draws out a sheet | seat from a sheet master roll, and the tension provision device which applies a braking force with respect to the rotation of the said sheet master roll so that the pulled-out sheet may be kept in tension. The tension imparting device is adapted to change the amount of electricity supplied to the variable brake in response to a change in the ratio of the rotational speed of the drive shaft and the rotational speed of the sheet disc roll. A sheet feeding apparatus from a sheet disc roll having a brake control device is provided.

In the sheet supply apparatus according to the present invention, a tension applying device that applies a braking force to maintain a sheet drawn out from a sheet disc roll in a tensioned state, employs a variable brake in which the braking force changes when the amount of electricity supplied changes, The amount of electricity supplied to the variable brake is changed according to the change of the ratio of the rotational speed of the drive shaft which applies the driving force which draws out a sheet from the sheet disk roll, and the rotation speed of the sheet disk roll. Irrespective of the drawing speed, a braking force changed in accordance with the change in the diameter of the sheet master roll is applied to the sheet master roll, and a predetermined constant tension can always be applied to the sheet drawn out from the master roll.

A brake control device employed in a sheet supplying apparatus according to the present invention, comprising: a first pulse generator for detecting the rotational speed of a sheet disc roll, and a second detecting the rotational speed of a drive shaft for applying a driving force to take out a sheet from the sheet disc roll In the case where the pulse generator and the second pulse generator adopt a configuration in which the generator has a converter that generates an electric quantity changed according to a change in the ratio of the number of pulses generated by the first pulse generator and the number of pulses generated by the first pulse generator, are applied to the sheet to be drawn out. It is desirable to be able to precisely control the braking force so that it is always constant regardless of the change in the diameter of the sheet disc roll.

Claims (3)

In the sheet feeding method of pulling out and supplying a sheet in a tension state while applying a braking force to the sheet master roll, The braking force applied to the sheet master roll is changed in accordance with a change in the ratio of the rotational speed of the drive shaft to the driving force for drawing out the sheet and the rotational speed of the sheet master roll. Sheet feeding method from sheet disc roll. A sheet supply apparatus having a drive shaft for applying a driving force for drawing out a sheet from a sheet master roll, and a tensioning device for applying a braking force against rotation of the sheet master roll so as to keep the drawn sheet in a tension state, The tension imparting device is adapted to change a variable brake in which the braking force changes when the amount of electricity supplied changes, and an amount of electricity supplied to the variable brake in accordance with a change in the ratio of the rotational speed of the drive shaft and the rotational speed of the sheet disc roll. Characterized by having a brake control device Sheet feeder from sheet disc roll. The method of claim 2, The brake control device includes a first pulse generator for detecting the rotation speed of the sheet disc roll, a second pulse generator for detecting the rotation speed of the drive shaft, a pulse number generated by the second pulse generator, and the first pulse generator. Characterized in that the pulse generator has a converter which generates a changed amount of electricity in accordance with the change in the ratio of the number of pulses generated. Sheet feeder.

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