JP2007203339A - Feedback tension unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feedback tension unit for feeding a fin material to a machining device while imparting tension to the fin material which can correctly control the movement of the fin material by preventing variation of the tension when adjusting the tension. <P>SOLUTION: The feedback tension unit comprises a tension imparting device 201 for imparting the tension to the fin material 101 by relatively moving a dancer roll 211 and a balance weight 213 in a vertical direction, an encoder 202 for measuring the amount of use of the fin material 101, and a controller 203 for moving the position of the dancer roll 211 so that the amount of use of the material per unit time reaches a target value on the basis of the result of measurement by the encoder 202. The controller 203 relatively moves the dancer roll 211 and the balance weight 213 in the vertical direction so that the amount of use of the material per unit time reaches the target value on the basis of the result of measurement by the encoder 202. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a feedback tension device that supplies a processing device while applying tension to a continuous thin plate-like material.

  The corrugated fin used in the heat exchanger is manufactured by a corrugated fin manufacturing apparatus that forms a thin plate material into a corrugated shape with a corrugated cutter.

  In a general corrugated fin manufacturing apparatus, a material wound in a roll shape is continuously supplied to a corrugated cutter while being drawn out. At this time, the material withdrawal amount is controlled so that the material supply amount and the corrugated cutter usage amount are substantially the same. Since the fin height and louver angle change when the amount of material used changes, it is important to keep the amount of material used constant in order to stably form the fins.

  Normally, an appropriate tension is applied to the material on the side opposite to the conveying direction. However, if the tension is increased, the amount of material used decreases, and if the tension is decreased, the amount of material used increases. This is because the amount of material used is made constant by utilizing the characteristics. For this purpose, there is provided a feedback tension device for performing feedback control while measuring the amount of material used and for applying tension so that the amount of material used becomes a preset value.

As a conventional example of this type of feedback tension device, the amount of use of the fin material is measured by an encoder, and the balance weight is moved on the arm according to the measurement result, so that the tension applied to the fin material is increased or decreased. What has been proposed has been proposed (see Patent Document 1).
JP 2004-223565 A

  FIG. 6 is a configuration diagram of a feedback tension device according to a conventional example such as Japanese Patent Application Laid-Open No. 2004-223565. The feedback tension device 100 shown in FIG. 6 is a device for supplying a continuous thin plate-like fin material (material) 101 to the corrugated fin processing device 120. However, in FIG. 6, illustration of a control device, a measurement device, and the like is omitted.

  As shown in FIG. 6, the corrugated fin processing apparatus 120 includes a pair of free dump rolls 121 that convey the fin material 101 to the downstream side and a pair of fixed pulleys that support the fin material 101 loosened on the tension applying device 110 side. 122, a pair of length measuring rolls 123 that rotate in accordance with the amount of use of the fin material 101, measure the amount of use, send the measurement result to an encoder (not shown), and the fin material 101 is separated into two by a pair of cutters And a corrugating cutter 125 that processes the fin material 101 that has been divided into two by the slit processing device 124 into a corrugated shape. Here, the supply amount of the material is determined by the rotational speed of the free dump roll 121. That is, the rotational speed of the free dump roll 121 is controlled so that (amount of material used) = (amount of material supplied), but advanced control is required to make it completely equivalent. Therefore, if (material usage)> (material supply) during molding, the pulley 114 moves upward, and (material usage) <(material supply). In this case, the pulley 114 moves downward. Therefore, actually, the pulley 114 forms the fins while moving up and down.

  The tension applying device 110 includes a base 111 and an arm 113 rotatably attached to a pivot 112 of the base 111 as main components. A pulley 114 is provided at one end of the arm 113, and a balance weight 115 is attached to the vicinity of the pulley 114 so as to be movable in the left-right direction with respect to the arm 113. The balance weight 115 is connected to the air cylinder 116 and is configured to follow the expansion and contraction of the air cylinder 116 so as to move and lock on the arm 113 in the left-right direction. A fixed balance weight 117 is attached to the other end of the arm 113 to balance the left and right of the arm 113 around the pivot 112.

  Next, the operation of the feedback tension device 100 configured as described above will be described. In FIG. 6, the fin material 101 conveyed to the downstream side from the free dump roll 121 is given a tension by the pulley 114 of the tension applying device 110 via the fixed pulley 122 and is guided to the length measuring roll 123. The fin material 101 is subjected to predetermined processing by a slit processing device 124 and a corrugated cutter 125 through a length measuring roll 123, and a corrugated corrugated fin 101a is formed.

  During this time, a measurement result corresponding to the usage amount of the fin material 101 is sent from the length measuring roll 123 to an encoder (not shown), and this measurement result is further sent to a control device (not shown). In the control device, the usage amount of the fin material 101 per unit time is calculated from the measurement result, and the air cylinder 116 is expanded and contracted so that the usage amount of the fin material 101 matches a preset target value. As a result, the balance weight 115 moves in the left-right direction on the arm 113, and a predetermined tension is applied to the fin material 101 via the pulley 114 of the arm 113. For example, when the usage amount of the fin material 101 exceeds the target value, the balance weight 115 is moved to the left on the arm 113 to increase the load on the pulley 114, and the tension on the fin material 101 is increased to increase the fin material 101. The amount of use of 101 on the downstream side is suppressed. Further, when the usage amount of the fin material 101 is less than the target value, the balance weight 115 is moved to the right on the arm 113, the load on the pulley 114 is reduced, the tension on the fin material 101 is reduced, and the fin material 101 The usage amount to the downstream side of 101 is increased.

  FIG. 7 is a schematic diagram showing the tension when the arm 113 is in a horizontal state (no tilt), and FIG. 8 is a schematic diagram showing the tension when the arm 113 is tilted downward by an angle θ. 7 and 8, the balance weight 115A is considered as a unit (unit) including the mass of the air cylinder 116. The masses of the pulley 114, the balance weight 115A, and the fixed balance weight 117 are M1, M2, and M3, respectively, and the distances from the pivot 112 (hereinafter, point O as appropriate) to the center of gravity of each part are L, a, and b.

As shown in FIG. 7, when the arm 113 is in a horizontal state, due to the balance of moments around the point O,
M3gb + 2TL-M1gL-M2ga = 0 (g is the acceleration of gravity)
Therefore, the tension T applied to the fin material 101 is
T = (g / 2L) × (M1L + M2a−M3b)
It becomes.

On the other hand, if the state of (material usage) <(material supply) is satisfied and the arm 113 is inclined downward by θ, the fin material 101 has α, Tension is applied at an angle of β. At this time, due to the balance of moments around point O,
M3gcosθ · b + T (cosα + cosβ) cosθ · L-M1gcosθ · L-M2gcosθ · a = 0
Therefore, the tension T applied to the fin material 101 is
T = (g / L (cosα + cosβ)) × (M1L + M2a−M3b)
It becomes.

  In other words, in the conventional feedback tension device, when the arm 113 is tilted, the position of the pulley 114 moves not only in the vertical direction but also in the horizontal direction. Therefore, the fin material 101 wound around the pulley 114 is in relation to the z axis. As a result, the tension applied to the fin material 101 changes depending on the position of the pulley 114.

  As described above, if the tension applied to the fin material 101 changes depending on the position of the pulley 114, that is, if the tension changes according to the inclination of the arm 113, the material of the material is not affected by feedback control. Since the amount of use does not match the target value, the fin shape (fin height, louver angle, etc.) processed by the subsequent corrugated cutter will change.

  In order to avoid this with the current apparatus, the arm 113 may be controlled so as not to move up and down as much as possible. In this case, the free dump roll 121 is set so that the amount of material used and the amount of material supplied are always the same. It must be controlled with high accuracy, resulting in an increase in equipment costs. Further, in order to make the amount of material used constant even when the arm 113 moves up and down, the balance weight 115 must be controlled with high frequency and high speed, which also increases the equipment cost.

  An object of the present invention is to provide a feedback tension device in which the tension applied to the fin material does not vary even when the tension is adjusted.

  In order to achieve the above object, the invention of claim 1 is a feedback tension device for supplying a continuous thin plate-like material to a subsequent processing means while applying tension to the opposite side to the conveying direction, and is a vertical tension device. Tension applying means for moving in the vertical direction relative to the tension applying roll that moves only in the direction and applies tension to the material, and the tension adjusting weight that moves only in the vertical direction in conjunction with the tension applying roll; Measuring means for measuring the amount of material used, and the tension applying roll by controlling the tension applying means so that the amount of material used per unit time becomes a target value based on the measurement result of the measuring means; Control means for relatively moving the tension adjusting weight in the vertical direction is provided.

  According to a second aspect of the present invention, in the first aspect, the tension applying means includes a first guide portion that holds a tension applying roll in which the material is wound in a substantially U shape so as to be movable only in a vertical direction, and the tension. A second guide portion that holds the tension adjusting weight connected to the additional roll and the wire by a movement only in the vertical direction, and the wire connected to the tension adding roll and the tension adjusting weight can be moved. A third guide portion that is held by the roller, and is connected to either the tension applying roll or the tension adjusting weight, and the tension applying roll and the tension adjusting weight are relatively moved in the vertical direction under the control of the control means. And a driving means for making it happen.

  According to a third aspect of the present invention, in the second aspect, the drive means is disposed on the installation surface of the apparatus.

  According to the first aspect of the present invention, since the tension applying roll moves only in the vertical direction, the tension does not change due to the position difference of the tension adding roll. Accordingly, there is no fluctuation in tension applied to the material when the tension is adjusted, and the amount of the material used can always be controlled according to the target value. As a result, it is possible to prevent changes in the fin shape (fin height, louver angle, etc.) processed by the subsequent corrugated cutter.

  According to the second aspect of the present invention, it is not necessary to control the tension applying roll at a high frequency and at a high speed, and the tension adding roll can be controlled with the same accuracy as the normal feedback control. Can be avoided.

  According to the invention of claim 3, since the arm as in the conventional device is not used, the device can be miniaturized to realize space saving. Further, since the driving means is not installed on the movable part, it is not necessary to increase the rigidity of the first guide part for holding the tension applying roll and the second guide part for holding the tension adjusting weight, thereby reducing the cost. Can be planned.

  Hereinafter, embodiments of a feedback tension device according to the present invention will be described.

<First Embodiment>
FIG. 1 is an overall configuration diagram showing a feedback tension device and its peripheral devices according to the first embodiment. As shown in FIG. 1, the feedback tension device 200 pulls out a fin material 101 from a coil portion (not shown) around which a continuous thin plate-shaped fin material (material) 101 is wound, and applies a predetermined tension to the fin material 101. However, it is a device that supplies the corrugated fin processing device 120, and includes a tension applying device 201, an encoder (measuring means) 202, a control device (control means) 203, a compressor 204, an electropneumatic regulator 205, and an air cylinder 206.

  In addition, since the structure of the corrugated fin processing apparatus 120 is the same as FIG. 6, the same code | symbol is attached | subjected to an equivalent part and detailed description is abbreviate | omitted. Further, illustration of a housing and a frame for fixing or supporting each part is omitted.

  As a mechanism for applying tension to the fin material 101, the tension applying device 201 holds a dancer roll (tension adding roll) 211 around which the fin material 101 is wound in a substantially U shape so as to be movable only in the vertical direction. 1 guide part 220, 2nd guide part 230 holding balance weight 213 (weight for tension adjustment) connected with dancer roll 211 and wire 212 so that movement is possible only in the perpendicular direction, dancer roll 211, and balance weight The main part is a third guide part 240 in which a wire 212 for connecting to 213 is wound in an inverted U shape and an air cylinder 206, and these parts are installed on a base 207.

  The balance weight 213 is connected to the shaft 206a of the air cylinder 206 at the lower portion by a wire 214, and moves downward in the vertical direction when the wire 214 is pulled by driving the air cylinder 206, and moves in the vertical direction when the wire 214 is extended. Move upward. That is, the dancer roll 211 and the balance weight 213 are configured to move relative to each other in the vertical direction by driving the air cylinder 206.

  FIG. 2 is a configuration diagram of a main part of a tension applying device (tension applying means) 201, where (a) shows a plan view and (b) shows a front view.

  The first guide unit 220 includes a pair of guides 221 and 222 provided in the vertical direction, and a dancer roll holding block 223 that holds the dancer roll 211.

  The dancer roll 211 is rotatably attached to a rotation shaft 224 provided on the side surface of the dancer roll holding block 223. The dancer roll holding block 223 has two holes (reference numerals omitted) penetrating in the vertical direction, and the guides 221 and 222 are engaged through the holes. As a result, the dancer roll 211 held by the dancer roll holding block 223 can move only in the Z direction.

  The second guide portion 230 includes a pair of guides 231 and 232 provided in the vertical direction and a balance weight holding block 233 that holds the balance weight 213. The balance weight holding block 233 has two holes (reference numerals omitted) penetrating in the vertical direction, and the guides 231 and 232 are engaged through the holes. As a result, the balance weight 213 held by the balance weight holding block 233 can move only in the Z direction.

  In the third guide portion 240, a pair of pulleys 241 and 242 are rotatably attached to a support member (not shown). A wire 212 that connects the dancer roll 211 and the balance weight 213 is wound around the pulleys 241 and 242 in an inverted U shape.

  Further, as shown in FIG. 1, a pair of pulleys 251 and 252 are rotatably attached to the upper portion of the third guide portion 240 by a support member (not shown), and are wound around the dancer roll 211 in a substantially U shape. The fin material 101 is supported.

  Next, the control mechanism will be described. As shown in FIG. 1, an encoder 202 is connected to the length measuring roll 123 of the corrugated fin processing apparatus 120. The control device 203 takes in the measurement result of the length measuring roll 123 as a pulse signal, and calculates the movement amount of the fin material 101 per unit time from the measurement result. Then, a control current is sent to the electropneumatic regulator 205 so that the usage amount of the fin material 101 becomes a target value of a preset usage amount.

  The control device 203 includes, for example, a microcomputer having a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and an input / output interface (I / O interface). However, the control device 203 may be configured by a plurality of microcomputers, and may be configured as a device that executes a plurality of controls in addition to tension adjustment described later.

  The air cylinder 206 is a low-friction type air cylinder in which the shaft 206a slides smoothly. The air pressure supplied from the electropneumatic regulator 205 causes the shaft 206a to expand and contract in the vertical direction so that the wire 214 is pulled / stretched. It is configured. The electropneumatic regulator 205 is supplied with air of a predetermined pressure from the compressor 204, and the air pressure applied to the air cylinder 206 is controlled by a control current sent from the control device 203.

  In this embodiment, the relationship between the mass M of the dancer roll 211 and the mass m of the balance weight 213 is M> m, and the air cylinder 206 is connected to the balance weight 213 having a small mass. Accordingly, the balance weight 213 is always pulled downward by the air cylinder 206 to maintain a balance with the dancer roll 211.

  Next, the operation of the tension applying device 201 configured as described above will be described.

  In FIG. 1, the fin material 101 drawn out from a coil portion (not shown) is bent in a substantially U shape by a pair of pulleys 251 and 252 and a dancer roll 211, and given tension is applied by the wound dancer roll 211. In this way, it is supplied to the length measuring roll 123. And the fin material 101 is sent to the slit processing device 124 and the corrugated cutter 125 through the length measuring roll 123, and is shaped into a corrugated corrugated fin 101a by being subjected to predetermined processing.

  During this time, the measurement result corresponding to the usage amount of the fin material 101 is taken into the encoder 202 from the length measuring roll 123 and sent to the control device 203. The control device 203 calculates the usage amount of the fin material 101 per unit time from the measurement result of the length measuring roll 123, and sends the usage amount of the fin material 101 to the electropneumatic regulator 205 so that the usage amount of the fin material 101 becomes a preset target value. Send control current. Thus, air having a pressure corresponding to the control current sent from the control device 203 is supplied from the electropneumatic regulator 205 to the air cylinder 206, and the force that pulls the wire 214 vertically downward by the air cylinder 206 increases or decreases. .

  By this feedback control, the force with which the wire 214 pulls the balance weight 213 vertically downward changes. Thereby, since the force pulling the dancer roll 211 connected by the balance weight 213 and the wire 212 changes, the load applied to the dancer roll 211 increases or decreases. As a result, the tension fins applied to the fin material 101 also change, and the amount of use of the fin material 101 to the downstream side also increases or decreases.

  For example, when the usage amount of the fin material 101 is less than the target value, the control device 203 further increases the force for contracting the shaft 206a of the air cylinder 206, and further increases the force by which the wire 214 is pulled downward. To control. By this feedback control, the force with which the balance weight 213 pulls the dancer roll 211 upward increases, and the load applied to the dancer roll 211 decreases. Accordingly, since the dancer roll 211 moves upward in the vertical direction along the guides 221 and 222, the tension applied to the fin material 101 is reduced, and the amount of use of the fin material 101 downstream is increased. become.

  Further, when the usage amount of the fin material 101 exceeds the target value, the control device 203 controls to reduce the force for contracting the shaft 206a of the air cylinder 206 and to reduce the force for pulling the wire 214 downward. . Due to this feedback control, the balance weight 213 is pulled vertically downward with a small force, so that the force with which the balance weight 213 pulls the dancer roll 211 upward is reduced, and the load applied to the dancer roll 211 is increased. Thereby, the tension | tensile_strength provided to the fin material 101 becomes large, and the usage-amount to the downstream of the fin material 101 can be decreased.

  Here, the tension applied to the fin material 101 will be described with reference to FIG. FIG. 3 is a schematic diagram showing vector components of forces generated in the dancer roll 211, the balance weight 213, and the air cylinder 206. As shown in FIG. Here, the mass of the dancer roll 211 is M, the mass of the balance weight 213 is m (M> m), the tensile force of the air cylinder 206 is F, and the tension applied to the fin material 101 is T.

  In FIG. 3, 2T = Mg-mg-F (g is the acceleration of gravity) due to the balance of force. Therefore, the tension T applied to the fin material 101 is T = 1/2 (Mg-mg-F).

  The pulling force F of the air cylinder 206 described above varies depending on the air pressure P ′ sent from the electropneumatic regulator 205. That is, as the air pressure P ′ increases, the tension force F of the air cylinder 206 also increases, so the tension T decreases. Further, if the air pressure P ′ decreases, the tension F of the air cylinder 206 also decreases, so that the tension T increases. Thus, the tension T changes with the air pressure P ′, and the position of the dancer roll 211 is not related at all.

  As described above, according to the feedback tension device 200 of this embodiment, the dancer roll 211 moves only in the vertical direction and does not move in the horizontal direction. Therefore, even if the dancer roll 211 moves, the tension is affected. Don't give. Therefore, when the tension is adjusted, the amount of material used is controlled to a target value, so that the relationship between the amount of material supplied and the amount of material used collapses and the vertical position of the dancer roll 211 changes. Since the tension applied to the fin material 101 due to the change in the position of the dancer roll 211 does not occur, changes in the fin shape (fin height, louver angle, etc.) processed by the corrugated cutter 125 at the subsequent stage are prevented. be able to.

  In addition, since the tension change due to the difference in the vertical position of the dancer roll 211 does not occur, it is not necessary to control the dancer roll 211 with high frequency and high speed, and can be performed with the same degree of accuracy as normal feedback control. An increase in cost can be avoided.

  Further, in the conventional device (Japanese Patent Laid-Open No. 2004-223565), the air cylinder is provided between the pulley and the fulcrum, so that the arm distance L becomes long, and the arm rigidity increases as the distance L increases. As a result, the entire apparatus has become large. However, since the feedback tension device 200 of this embodiment does not use an arm as in the above-described conventional device, the device can be miniaturized to save space. Further, since the air cylinder 206 and a servo motor 252 to be described later are not installed in the movable part of the apparatus, the rigidity of the first guide part 220 that holds the dancer roll 211 and the second guide part 230 that holds the balance weight 213 is increased. There is no need to increase the cost and the cost can be reduced.

Second Embodiment
In the first embodiment, the example in which the air cylinder 206 is connected to the balance weight 213 is shown as a configuration when M> m. However, when M <m, the air cylinder 206 is a dancer roll having a small mass. 211 is connected. In this case, the dancer roll 211 is always pulled downward by the air cylinder 206 to maintain the balance with the balance weight 213.

  FIG. 4 shows vector components of forces generated in the dancer roll 211, the balance weight 213, and the air cylinder 206 when the air cylinder 206 is connected to the dancer roll 211. In FIG. 4, 2T = Mg−mg + F due to force balance. Therefore, the tension T applied to the fin material 101 is T = 1/2 (Mg-mg + F).

  Also in the present embodiment, the pulling force F of the air cylinder 206 varies depending on the air pressure P ′ sent from the electropneumatic regulator 205, but the relationship between the air pressure P ′ and the tension T is reversed. That is, as the air pressure P ′ increases, the tension F of the air cylinder 206 also increases, so that the tension T increases. Further, if the air pressure P ′ decreases, the tension F of the air cylinder 206 also decreases, so the tension T decreases. As described above, also in this embodiment, the tension T varies depending on the air pressure P ′, and the position of the dancer roll 211 is not related at all. Therefore, the tension weight 213 can be moved to any position in the vertical direction. T does not vary. Therefore, even when the configuration of the present embodiment is adopted, the same effect as that of the first embodiment can be obtained.

<Third Embodiment>
In the first and second embodiments, the example in which the tensile force F of the balance weight 213 and the dancer roll 211 is generated by the air cylinder 206 has been described, but the tensile force F may be generated by a motor or the like.

  FIG. 5 is an overall configuration diagram showing an example in which a servo motor is connected to the balance weight 213 as a configuration when M> m. In the present embodiment, a pulley 251 is disposed below the balance weight 213, and the end portion of the wire 214 wound around the pulley 251 is connected to the servo motor 252. The servo motor 252 is driven by the controller 253, the control current sent from the control device 203 is converted into the torque of the servo motor 252 by the controller 253, and a predetermined drive current is supplied to the servo motor 252 so that the wire 214 The winding force is controlled.

  If M <m, the servo motor 252 may be connected to the dancer roll 211 having a small mass (not shown). Further, the wire 214 may be directly wound around the rotation shaft of the servo motor 252.

  Even in the case of the configuration of the present embodiment, since the magnitude of the tension T does not vary depending on the position of the dancer roll 211, the same effect as in the first embodiment can be obtained. In particular, according to the configuration of the present embodiment, the tensile force F of the balance weight 213 and the dancer roll 211 is generated by the servo motor 252, so that the tensile force F can be controlled as compared with the case where the air cylinder 206 is used. It becomes easy and quietness can be enhanced.

  In each of the above embodiments, as illustrated in FIG. 2A, the example in which the balance weight 213 and the dancer roll 211 are arranged in the x direction has been described. However, the wire 212 is orthogonal to the conveyance direction of the fin material 101. Thus, the balance weight 213 may be arranged in the z direction.

  In each of the above embodiments, instead of the wires 212 and 214, a belt or a chain having a structure in which a plurality of pieces are connected may be used.

1 is an overall configuration diagram showing a feedback tension device and its peripheral devices according to a first embodiment. The block diagram of the principal part of a tension | tensile_strength provision apparatus. (A) is a top view. (B) is a front view. The schematic diagram which shows the vector component of the force which generate | occur | produces in a dancer roll, a balance weight, and an air cylinder at the time of connecting an air cylinder to a balance weight. The schematic diagram which shows the vector component of the force which generate | occur | produces in a dancer roll, a balance weight, and an air cylinder at the time of connecting an air cylinder to a dancer roll (2nd Embodiment). The whole block diagram which shows the example which connected the servomotor to the balance weight (3rd Embodiment). The block diagram of the feedback tension apparatus by a prior art example. The schematic diagram which shows tension | tensile_strength when an arm is a horizontal state (no inclination) in a prior art example. The schematic diagram which shows tension | tensile_strength when an arm inclines below only angle (theta) in a prior art example.

Explanation of symbols

123 ... Measuring roll 124 ... Slit processing device 125 ... Corrugated cutter 200 ... Feedback tension device 201 ... Tension applying device 202 ... Encoder 203 ... Control device 204 ... Compressor 205 ... Electropneumatic regulator 206 ... Air cylinder 206a ... Shaft 211 ... Dancer roll 212, 214 ... wire 213 ... balance weight 220 ... first guide part 221, 222, 231, 232 ... guide 223 ... dancer roll holding block 224 ... rotating shaft 230 ... second guide part 233 ... balance weight holding block 240 ... first 3 Guide portion 241, 251 ... Pulley 252 ... Servo motor 253 ... Controller

Claims (3)

A feedback tension device that supplies a continuous thin plate-like material (101) to a subsequent processing means while applying a tension on the opposite side to the conveying direction,
A tension application roll (204) that moves only in the vertical direction and applies tension to the material (101), and a tension adjustment weight (213) that moves only in the vertical direction in conjunction with the tension application roll (204). ) And a tension applying means (201) for relative movement in the vertical direction,
Measuring means (202) for measuring the amount of the material (101) used;
The tension applying roll (204) is controlled by controlling the tension applying means (201) so that the amount of the material (101) used per unit time becomes a target value based on the measurement result of the measuring means (202). And control means (203) for relatively moving the tension adjusting weight (213) in the vertical direction,
A feedback tension device comprising: The tension applying means (201)
A first guide part (220) for holding a tension applying roll (211) around which the material (101) is wound in a substantially U shape so as to be movable only in a vertical direction, the tension adding roll (211) and a wire ( 212), a second guide portion (230) that holds the tension adjustment weight (213) connected by the vertical movement in a vertical direction, the tension application roll (211), and the tension adjustment weight (213). The control unit is connected to either the third guide part (240) movably holding the connected wire (212) and either the tension applying roll (211) or the tension adjusting weight (213). The tension applying roll (211) and the tension adjusting way are controlled by means (203). Drive means (206) for relatively moving (213) in the vertical direction and feedback tensioning device according to claim 1, characterized in that it comprises a.   3. The feedback tension device according to claim 2, wherein the driving means (206) is arranged on an installation surface of the apparatus.

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