JP2007069940A - Feeding apparatus, vertical type bag manufacturing and packaging machine, and metering and packaging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feeding apparatus capable of easily operating a roll diameter of a feeding roller, a vertical type bag manufacturing and packaging machine, and a metering and packaging system. <P>SOLUTION: An angular displacement detecting part 81 detects an angular displacement of the feeding roller 50 from the amount of rotation (detected result) of the feeding roller 50 detected by an encoder 51. A transfer displacement detecting part 84 detects a moving displacement of a dancer roller bar 45 from the detected result of a displacement detecting part 60. A roll diameter operating part 85 operates the roll diameter RD of the feeding roller 50 from the angular displacement of the feeding roller 50 detected when the feeding roller 50 is reversely rotated and a packaging material TF is wound on the feeding roller 50 under a condition that feeding of the packaging material TF is stopped, and the transfer displacement of the dancer roller bar 45. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a supply device, a vertical bag making and packaging machine, and a weighing and packaging system for supplying a sheet-like long object wound around a supply roller to the use side of the long object. The present invention relates to improvement of the roll diameter calculation method.

  Conventionally, a method for calculating the roll diameter of a film roll of a film supply apparatus is known (for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-072157

  Here, in the film supply apparatus of Patent Document 1, in order to calculate the roll diameter of the film roll, it is necessary to feed out the film from the film roll while stopping the film supply to the film using apparatus side.

  However, in this method, before the film supply operation is restarted, the fed film must be wound around a film roll and the dancer roll must be moved to a predetermined position. That is, the film supply apparatus of Patent Document 1 cannot execute the film supply operation immediately after calculating the roll diameter.

  Therefore, an object of the present invention is to provide a supply device, a vertical bag making and packaging machine, and a weighing and packaging system that can easily calculate the roll diameter of the supply roller.

  In order to solve the above-mentioned problem, the invention of claim 1 is a supply device for supplying a sheet-like long object wound around a supply roller to the use side of the long object, and is supplied to the use side. A tension roller that adjusts the tension of the long object while being in contact with the long object; a first detection unit that detects a displacement of the tension roller; and a second detection that detects an angular displacement of the supply roller. And the process of supplying the long object to the use side is stopped, and the tension roller is moved to the reference position by rotating the supply roller in reverse and winding the long object around the supply roller. In this case, a calculation unit is provided that calculates a roll diameter of the supply roller based on the movement displacement of the tension roller and the angular displacement of the supply roller.

  According to a second aspect of the present invention, in the supply device according to the first aspect, an origin search for returning the position of the tension roller from the origin search start position to the reference position by controlling a rotation operation of the supply roller. A control unit, wherein the calculation unit is configured to move the tension roller during the origin search when the position of the tension roller moves from the origin search start position to the reference position due to the reverse rotation of the supply roller. The roll diameter of the supply roller is calculated based on the movement displacement of the roller and the angular displacement of the supply roller.

  According to a third aspect of the present invention, in the supply device according to the first or second aspect, the first detection unit detects the movement displacement based on a detection result of the movement displacement detection unit, and the movement The displacement detection unit includes a spring member attached to the tension roller, and a load cell that is provided on the fixed side and detects a biasing force biased from the spring member according to the position of the tension roller. It is characterized by that.

  According to a fourth aspect of the present invention, in the supply device according to the first or second aspect, the first detection unit detects the movement displacement based on a detection result of the movement displacement detection unit, and the movement The displacement detection unit includes a conversion unit that converts the operation of the tension roller into a rotation operation, and a first encoder that detects the operation of the tension roller converted by the conversion unit as an angular displacement. To do.

  The invention according to claim 5 is the supply device according to any one of claims 1 to 4, wherein the tension roller can be moved up and down, and the first detection unit is the tensioner. It is characterized by detecting the amount of elevation of the roller.

  According to a sixth aspect of the present invention, in the supply device according to any one of the first to fifth aspects, the second detection unit is based on a detection result of a second encoder that detects a rotation amount of the supply roller. The angular displacement is detected.

  In addition, the invention of claim 7 forms a bag of the packaging material formed into a cylindrical shape while vertically and laterally sealing along the flow direction and the width direction of the packaging material, and falls into the bag made of the bag. A vertical bag making and packaging machine for filling an object to be packaged, wherein the packaging material is thermally compressed in the flow direction to longitudinally seal the packaging material, and the packaging material has the width. A pair of horizontal sealing devices that laterally seal the packaging material by thermocompression while being sandwiched along the direction, and a supply that supplies the packaging material to the vertical sealing device and the lateral sealing device on the side where the packaging material is used A tension roller that adjusts the tension of the packaging material while being in contact with the packaging material supplied to the use side, and a first detection that detects a displacement of the tension roller. And the angular displacement of the supply roller The second detection unit to be taken out and the process of supplying the packaging material to the use side are stopped, and the tension roller is used as a reference by rotating the supply roller reversely and winding the packaging material around the supply roller. In the case of moving to a position, a calculation unit is provided that calculates a roll diameter of the supply roller based on the movement displacement of the tension roller and the angular displacement of the supply roller.

  Further, the invention of claim 8 is a weighing and packaging system, wherein the combination weighing machine is configured to measure a predetermined amount of the package by combination weighing, and is arranged below the combination weighing machine. A vertical bag making and packaging machine.

According to the first to eighth aspects of the present invention, when the supply of the long object is stopped, the position of the tension roller is set to the reference position by reversing the supply roller and winding the long object. The roll diameter of the supply roller can be calculated. As a result, after the roll diameter calculation process is completed, it becomes possible to quickly re-feed the long object to the use side without performing the take-up process of the extra long object that has been fed out. Therefore, even after the roll diameter is calculated, a long object can be efficiently supplied to the use side.
The process which supplies a long thing to the use side can be performed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<1. Configuration of weighing and packaging system and vertical bag making and packaging machine>
FIG. 1 is a perspective view showing an example of the overall configuration of a weighing and packaging system 1 according to an embodiment of the present invention. FIG. 2 is a front view showing an example of the configuration of the combination weighing machine 2 and the vertical bag making and packaging machine 3. 1 and the subsequent drawings have an XYZ orthogonal coordinate system in which the Z-axis direction is a vertical direction and the XY plane is a horizontal plane, as necessary, in order to clarify the directional relationship. .

  The weighing and packaging system 1 is a weighing and bag making and packaging line that measures a certain amount of an object to be packaged (for example, food such as potato chips) X and packages the certain amount of the object to be packaged X. As shown in FIG. 1, the weighing and packaging system 1 mainly includes a combination weighing machine 2, a vertical bag making and packaging machine 3, a seal checker 4, and a weight checker 5.

  The combination weighing machine 2 measures a certain amount of the packaged item X and supplies the measured packaged product X to the vertical bag making and packaging machine 3 disposed below. As shown in FIG. 2, the combination weighing machine 2 mainly includes a dispersion feeder 21, a trough 22, a pool hopper 23, a weighing hopper 24, and a collecting chute 25.

  When the package object X to be weighed is supplied to the combination weighing machine 2, the supplied package object X is dropped near the center of the dispersion feeder 21. As shown in FIG. 2, a plurality of troughs 22 are provided on the periphery of the dispersion feeder 21. Further, the dispersion feeder 21 and the trough 22 are given vibrations from a vibrating device (not shown). As a result, the articles to be packaged X supplied to the dispersion feeder 21 fall through the troughs 22 and are stored in the corresponding pool hoppers 23.

  Each of the plurality of pool hoppers 23 is disposed above the corresponding weighing hopper 24, and temporarily stores the packages X to be supplied to the weighing hopper 24. Each of the plurality of weighing hoppers 24 includes a weight detector (for example, a load cell: not shown) that measures the weight of the package X supplied from the corresponding pool hopper 23.

  The weighing machine control unit 20 detects the weight value of the package X stored in each weighing hopper 24. The weighing machine control unit 20 calculates the combination closest to the desired value from the sum obtained by the combination of the weight values, and the packaged item X from the weighing hopper 24 corresponding to this combination toward the collecting chute 25. Is discharged. As a result, a certain amount of the packaged goods X discharged to the collecting chute 25 is supplied to the vertical bag making and packaging machine 3.

  In addition, the weighing machine control unit 20 replenishes the weighing hopper 24 that has been emptied after the packaging material X is discharged, so that the packaging material X is directed from the corresponding pool hopper 23 toward the weighing hopper 24. To supply.

  As shown in FIGS. 1 and 2, the vertical bag making and packaging machine 3 is disposed below the combination weighing machine 2, and the packaging material TF discharged from the combination weighing machine 2 and dropped is packaged TF. This is a device for packing with a film (for example, a film formed of plastic). As shown in FIG. 2, the vertical bag making and packaging machine 3 mainly includes a tube 31, a former 32, a pull-down belt 33, a vertical seal device 34, a horizontal seal device 35, and a supply device 40. .

  The tube 31 and the former 32 are molding mechanisms that mold the packaging material TF supplied from the supply device 40 into a cylindrical shape. The tube 31 is a substantially cylindrical member, and its upper and lower ends are open. The former 32 is disposed so as to surround the tube 31. When the packaging material TF is introduced between the tube 31 and the former 32, the introduced packaging material TF is wound around the tube 31 and formed into a substantially cylindrical shape.

  In addition, the articles to be packaged X from the combination weighing machine 2 are put into the tube 31 from the upper end opening of the tube 31. The supply device 40 that supplies the packaging material TF to the tube 31 and the former 32 will be described later.

  As shown in FIG. 2, the pull-down belt 33 and the vertical sealing device 34 are disposed below the tube 31 and the former 32. The pull-down belt 33 conveys the packaging material TF wound around the tube 31 in the direction of arrow AR1 (the flow direction of the packaging material TF: a direction substantially parallel to the Z axis). In addition, the vertical sealing device 34 thermally compresses the overlapping portion of the packaging material TF wound around the tube 31 along the flow direction AR1 to perform vertical sealing.

  The pair of horizontal sealing devices 35 weld and cut the packaging material. That is, by synchronizing the rotational movements of the lateral seal devices 35, the cylindrical packaging material TF is placed between the seal jaw 35a of one lateral seal device 35 and the seal jaw 35a of the other lateral seal device 35. It is sandwiched and thermocompression bonded. As a result, the packaging material TF is welded in the direction of the arrow AR2 (the width direction of the packaging material TF) substantially parallel to the Y axis and is laterally sealed, and the packaging material TF is cut from the welded portion.

  As shown in FIG. 2, the packaging machine control unit 30 includes a memory 30a that stores programs, variables, and the like, and a CPU 30b that executes control according to the programs stored in the memory 30a. Therefore, the CPU 30b can execute the operation control of the horizontal sealing device 35 and the supply device 40 at a predetermined timing according to the program stored in the memory 30a. The packaging machine control unit 30 is electrically connected to the weighing machine control unit 20. Therefore, by transmitting and receiving control signals between the controls 20 and 30, for example, the operations of the combination weighing machine 2 and the vertical bag making and packaging machine 3 can be synchronized.

  Returning to FIG. 1, the bag B filled with the article to be packaged X in the vertical bag making and packaging machine 3 is conveyed to the seal checker 4 to check the sealing condition, and the weight of the bag B is checked in the weight checker 5. A check is made as to whether or not is within a predetermined range. The non-defective bag B that has been checked for weight and sealing status is packed in a cardboard box or the like in a boxing unit (not shown).

<2. Configuration of supply device>
FIG. 3 is a front view illustrating an example of the configuration of the supply device 40. FIG. 4 is a perspective view showing an example of the configuration near the dancer roller bar. Here, the supply device 40 is a device that supplies the packaging material TF to the use side such as the vertical sealing device 34 and the horizontal sealing device 35. As shown in FIG. 3, the supply device 40 mainly includes a supply roller 50, a dancer roller bar 45, and a control unit 70.

  A wrapping material TF as a long sheet-like material is wound around the supply roller 50. The supply roller 50 can be rotated around the rotation shaft 50 a by the driving force applied from the motor 52. Therefore, when the supply roller 50 is rotated in the arrow R1 direction by the driving force from the motor 52, the packaging material TF is fed from the supply roller 50 to the use side. When the supply roller 50 is rotated in the direction of the arrow R2, the packaging material TF is wound around the supply roller 50. In the present embodiment, the rotation of the supply roller 50 in the directions indicated by the arrows R1 and R2 is referred to as “forward rotation” and “reverse rotation”, respectively.

  An encoder 51 capable of detecting the amount of rotation of the supply roller 50 is attached to the rotary shaft 50a. Based on the detection result by the encoder 51, the angular displacement of the supply roller 50 is detected.

  The dancer roller bar 45 is a tension roller that adjusts the tension of the packaging material TF fed from the supply roller 50 by rotating while being in contact with the packaging material TF. As shown in FIG. 3, the dancer roller bar 45 is disposed on the downstream side of the supply roller 50 and on the upstream side of the vertical seal device 34 and the horizontal seal device 35 when viewed from the supply direction SD of the packaging material TF. The

  As shown in FIG. 4, shafts 46 (46 a, 46 b) extending along the rotation shaft 49 of the dancer roller bar 45 are provided at both ends in the longitudinal direction of the dancer roller bar 45. Each shaft 46 is inserted into a slit 48 (48a, 48b) of a corresponding roller guide 47 (47a, 47b). Here, each slit 48 is an opening provided in the roller guide 47 and extends substantially along the Z-axis direction (vertical direction). By the slit 48, the movement of the dancer roller bar 45 is restricted in the vertical direction.

  Therefore, even if the feeding speed of the packaging material TF fed from the supply roller 50 and the conveyance speed of the packaging material TF by the pull-down belt 33 are inconsistent and the packaging material TF is slackened on the supply path, the dancer roller bar 45 is lowered. In the direction, tension is applied to the packaging material TF, and the slack is absorbed. For this reason, even when such a speed mismatch occurs, the packaging material TF can be satisfactorily supplied from the supply device 40 to the use side.

  The control unit 70 controls the operation of the supply device 40. As shown in FIG. 3, the control unit 70 mainly includes an angular displacement detection unit 81, a motor drive control unit 82, a movement displacement detection unit 84, a roll diameter calculation unit 85, and an origin search control unit 86. Have.

  The angular displacement detector (second detector) 81 is connected to the encoder 51 via a signal line. Therefore, the angular displacement detector 81 can detect the angular displacement of the supply roller 50 based on the rotation amount (detection result) of the supply roller 50 detected by the encoder 51.

  The motor drive control unit 82 executes torque control, speed control, and the like of the motor 52 based on the vertical height position Z of the dancer roller bar 45, for example. Thereby, the packaging material TF wound around the supply roller 50 is satisfactorily supplied from the supply roller 50 toward the use side.

  The movement displacement detector 84 detects the movement displacement of the dancer roller bar 45 based on the detection result of the displacement detector 60. As shown in FIG. 4, the displacement detection unit 60 mainly includes a spring member 61 and a load cell 62.

  The spring member 61 is a biasing portion that applies a biasing force to the load cell 62, and is provided substantially in parallel with the movement direction (vertical direction) AR3 of the dancer roller bar 45. As shown in FIG. 4, one end of the spring member 61 is attached to the shaft 46a of the dancer roller bar 45 on the movable side, and the other end is attached to the load cell 62 on the fixed side.

  The load cell 62 measures the urging force applied from the spring member 61 by converting it into a corresponding amount of electricity (electric resistance value). As shown in FIG. 4, the load cell 62 is attached to a predetermined portion 63 of the supply device 40.

  Therefore, the load cell 62 detects the electrical resistance value corresponding to the height position Z of the dancer roller bar 45, and the movement displacement detector 84 detects the amount of expansion / contraction of the spring member 61 based on the detection result (electric resistance value). Is calculated, the amount of movement (movement displacement) of the dancer roller bar 45 is detected.

  The roll diameter calculator 85 calculates the roll diameter of the supply roller 50 based on the angular displacement of the supply roller 50 detected by the angular displacement detector 81 and the movement displacement detected by the movement displacement detector 84. The origin search control unit 86 performs a process of moving the height position Z of the dancer roller bar 45 from the origin search start position Z0 to the reference position Z1 and returning it by controlling the turning operation of the supply roller 50.

  FIG. 5 is a diagram for explaining an example of a method for calculating the roll diameter RD that is the diameter of the supply roller 50 during the origin search. The origin search is executed, for example, when the vertical bag making and packaging machine 3 is turned on or restarted. Further, it is assumed that the height position Z of the dancer roller bar 45 has been lowered to the start position Z0 before starting the origin search. The reference position Z1 is determined in advance by experiments or the like.

  In the origin search, first, the packaging material TF is wound around the supply roller 50 by rotating the supply roller 50 in the reverse direction of the arrow R2. As a result, the dancer roller bar 45 rises in the direction of the arrow AR3 from the start position Z0.

  Further, while the supply roller 50 is rotated in the reverse direction, the angular displacement detector 81 monitors the angular displacement of the supply roller 50, and the movement displacement detector 84 monitors the movement displacement of the dancer roller bar 45. When the movement displacement of the dancer roller bar 45 becomes DH and the height position Z of the dancer roller bar 45 rises to the reference position Z1, the rotation of the supply roller 50 is stopped, and the origin search process ends.

  In the origin search, the angular displacement detection unit 81 detects the angular displacement α (rad) of the supply roller 50 from the start to the completion of the origin search. The roll diameter calculator 85 calculates the roll diameter RD of the supply roller 50 by substituting the movement displacement DH and the angular displacement α into Equation 1. That is, in this embodiment, the roll diameter RD of the supply device 40 can be calculated together with the origin search.

  RD = 4 × D11 / α (1)

<3. Advantages of Supply Device of Present Embodiment>
As described above, the supply device 40 according to the present embodiment can calculate the roll diameter RD of the supply device 40 while performing the origin search of the dancer roller bar 45. Thereby, when the origin search is completed, the supply device 40 can grasp the remaining amount of the packaging material TF from the roll diameter. Therefore, when the remaining amount of the packaging material TF is equal to or less than a predetermined value at the time of completion of the origin search and it is determined that the remaining amount of the packaging material TF is small, the user of the vertical bag making and packaging machine 3 is prompted to perform the packaging material TF replenishment process. This makes it possible to prevent the problem that the packaging material TF is lost during supply to the use side.

  In addition, the method for calculating the roll diameter RD according to the present embodiment is executed while winding the packaging material TF around the supply roller 50 in a state where the supply of the packaging material TF is stopped. Note that the calculation timing of the roll diameter RD is not limited during the origin search. On the other hand, the conventional method for calculating the roll diameter RD is executed while feeding the packaging material TF from the supply roller 50.

  As described above, in the conventional technique, after the roll diameter RD is calculated, an extra process of winding the rolled packaging material TF is required. In the calculation method of the present embodiment, such an extra process is not performed. It is unnecessary. Thereby, the supply apparatus 40 of this Embodiment will be in the state which can re-supply packaging material TF immediately after the calculation process of roll diameter RD. Therefore, even after the roll diameter RD is calculated, the packaging material TF can be efficiently supplied to the use side.

<4. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made.

  (1) In the present embodiment, the angular displacement detector 81, the motor drive controller 82, the movement displacement detector 84, the roll diameter calculator 85, and the origin search controller 86 are provided in the controller 70. For example, the parts 81, 82, 84, and 85 may be provided in the packaging machine control unit 30. That is, the operation control of the supply device 40 may be executed by the packaging machine control unit 30 without providing the separate control unit 70 for the supply device 40.

  (2) In the present embodiment, the displacement of the dancer roller bar 45 is detected based on the amount of electricity (electric resistance value) detected by the load cell 62 of the displacement detector 60. However, the displacement detector The detection result usable at 60 is not limited to this.

  For example, the operation of the dancer roller bar 45 that moves in the vertical direction may be converted into a rotation operation by the rack and pinion method, and the operation of the dancer roller bar 45 may be detected as an angular displacement by an encoder or the like.

  That is, a pinion gear extending along the vertical direction is attached to the shaft 46a of the dancer roller bar 45 on the movable side, and a gear-like pinion gear that can be rotated as the pinion gear moves up and down is provided on the fixed side. An encoder capable of detecting the angular displacement of the pinion gear is provided on the rotation shaft of the pinion gear.

  Therefore, by detecting the angular displacement of the encoder provided on the rotation shaft of the pinion gear, it is possible to detect the movement displacement of the dancer roller bar 45 based on the detection result. In this case, the rack gear and the pinio gear are used as a conversion unit that converts the operation of the dancer roller bar 45 into a rotation operation.

  (3) In the present embodiment, the encoder 51 that detects the angular displacement of the supply roller 50 has been described as being attached to the rotating shaft 50a of the supply roller 50. However, the attachment position of the encoder 51 is not limited to this. . For example, the angular displacement of the supply roller 50 may be detected based on the detection result of the encoder 51 provided in the motor 52.

  (4) Further, in the present embodiment, the dancer roller bar 45 has been described as moving in the vertical direction, but the movement mode of the dancer roller bar 45 is not limited to this. For example, the dancer roller bar 45 may perform a rotating motion in accordance with the feeding state of the packaging material TF.

  FIG. 6 is a front view showing another example of the configuration near the dancer roller bar 45. As shown in FIG. 6, the rotation shaft 146 of the dancer roller bar 145 is pivotally supported at one end of the arm 141. In addition, a rotation shaft 142 is provided at the other end of the arm 141, and the arm 141 is rotatable about the rotation shaft 142. The spring member 147 is a biasing portion that applies a biasing force to the arm 141, and one end thereof is attached to the arm 141 on the movable side, and the other end is attached to the predetermined portion 148 on the fixed side. Therefore, the dancer roller bar 145 rotates around the rotation shaft 142 in accordance with the delivery state of the packaging material TF.

  Also in the supply device 40 having such a dancer roller bar 145, the supply roller 50 is based on the winding amount of the packaging material TF based on the movement displacement of the dancer roller bar 145 and the angular displacement of the supply roller 50. The roll diameter RD is calculated. In this case, the same advantageous effect as that when the dancer roller bar 45 is used is produced.

It is a perspective view which shows an example of the whole structure of the measurement packaging system in embodiment of this invention. It is a front view which shows an example of a structure of the combination weighing machine and vertical type bag making packaging machine in this Embodiment. It is a front view which shows an example of a structure of a supply apparatus. It is a perspective view which shows an example of a structure of the dancer roller bar vicinity. It is a figure for demonstrating an example of the method of calculating a roll diameter. It is a front view which shows the other example of a structure of the dancer roller bar vicinity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement packaging system 2 Combination weighing machine 3 Vertical bag making packaging machine 30 Packaging machine control unit 34 Vertical sealing apparatus 35 Horizontal sealing apparatus 40 Supply apparatus 45, 145 Dancer roller bar 46 (46a, 46b) Shaft 47 (47a, 47b) Roller guide 48 (48a, 48b) Slit 50 Supply roller 50a, 142, 146 Rotating shaft 51 Encoder 52 Motor 60 Displacement detection unit 61 Spring member 62 Load cell 70 Control unit 81 Angular displacement detection unit 82 Motor drive control unit 84 Movement displacement detection unit 85 Roll diameter calculation unit 86 Origin search control unit 141 Arm 147 Spring member α Angular displacement B Bag DH Movement displacement RD Angular displacement TF Packaging material

Claims (8)

A supply device for supplying a sheet-like long object wound around a supply roller to the use side of the long object,
(a) a tension roller that adjusts the tension of the long object while in contact with the long object supplied to the use side;
(b) a first detector for detecting displacement of the tension roller;
(c) a second detection unit for detecting an angular displacement of the supply roller;
(d) The process of supplying the long object to the use side is stopped, and the tension roller is moved to the reference position by rotating the supply roller in reverse and winding the long object around the supply roller. A calculation unit that calculates a roll diameter of the supply roller based on the movement displacement of the tension roller and the angular displacement of the supply roller;
A supply device comprising: The supply device according to claim 1,
(e) An origin search control unit that returns the position of the tension roller from the origin search start position to the reference position by controlling the rotation operation of the supply roller;
Further comprising
When the position of the tension roller moves from the origin search start position to the reference position due to the reverse rotation of the supply roller, the calculation unit and the displacement displacement of the tension roller during the origin search and the A supply device that calculates a roll diameter of the supply roller based on the angular displacement of the supply roller. The supply device according to claim 1 or 2,
The first detection unit detects the movement displacement based on a detection result of the movement displacement detection unit,
The movement displacement detector is
A spring member attached to the tension roller;
A load cell that is provided on a fixed side and detects a biasing force biased from the spring member according to a position of the tension roller;
A supply device comprising: The supply device according to claim 1 or 2,
The first detection unit detects the movement displacement based on a detection result of the movement displacement detection unit,
The movement displacement detector is
A converting unit that converts the operation of the tension roller into a rotating operation;
A first encoder that detects an operation of the tension roller converted by the conversion unit as an angular displacement;
A supply device comprising: The supply device according to any one of claims 1 to 4,
The tension roller can be moved up and down,
The supply device according to claim 1, wherein the first detection unit detects an elevation amount of the tension roller. The supply device according to any one of claims 1 to 5,
The second detection unit detects the angular displacement based on a detection result of a second encoder that detects a rotation amount of the supply roller. A bag-shaped packaging material is formed while being vertically and laterally sealed along the flow direction and width direction of the packaging material, and is filled with an article to be packaged that falls into the bag. A bag wrapping machine,
(a) a longitudinal sealing device that longitudinally seals the packaging material by thermocompression bonding the packaging material along the flow direction;
(b) a pair of lateral sealing devices that laterally seal the packaging material by thermocompression bonding while sandwiching the packaging material along the width direction;
(c) a supply device that supplies the packaging material to the longitudinal sealing device and the lateral sealing device that are on the use side of the packaging material;
With
The supply device includes:
(c-1) a tension roller that adjusts the tension of the packaging material while in contact with the packaging material supplied to the use side;
(c-2) a first detector for detecting displacement of the tension roller;
(c-3) a second detector for detecting an angular displacement of the supply roller;
(c-4) The process of supplying the packaging material to the use side is stopped, and the tension roller is moved to the reference position by rotating the supply roller reversely and winding the packaging material around the supply roller. A calculation unit that calculates a roll diameter of the supply roller based on the movement displacement of the tension roller and the angular displacement of the supply roller;
A vertical bag making and packaging machine comprising: A weighing and packaging system,
A combination weighing machine that weighs a certain amount of packages by combination weighing;
The vertical bag making and packaging machine according to claim 7, which is disposed below the combination weighing machine,
A weighing and packaging system comprising:

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