Wire-rod feeding device and wire-rod feeding method

Abstract

To provide a wire-rod feeding device that can feed a wire-rod surely and intermittently.SOLUTION: A wire-rod feeding device ST is provided with: a feeding device 91 that feeds a wire-rod m from a bobbin which the wire-rod m is wound around while applying tensile force T thereto; a correcting device 92 that corrects the wire-rod m fed from the bobbin, in a linear shape; and a feed device 93 that has a gripper 3G that grips the wire-rod m corrected by the correcting device 92 by predetermined gripping force Fa and a feeder 3F that moves the gripper 3G in the opposite direction of a direction of the feeding device 91 by applying feed force Ft thereto. The feed force Ft is larger than total force of resistance force F1F generated when moving the feeder 3F not gripping the wire-rod m, inertial force m1F relating to mass of the wire-rod m, resistance force Fn1 acting on the wire-rod m and friction force eF generated at respective sites, and total force of the resistance force Fn1 acting on the wire-rod m and the friction force eF generated at the respective sites is smaller than maximum static friction force FNm between the wire-rod m and the gripper 3G which is generated by the gripping force Fa.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a wire feeding device and a wire feeding method.

Background Art

[0002] Patent Document 1 describes a wire feeding device that unwinds a wire wound around a reel by a feed roller and supplies it to a wire processing device. In this wire feeding device, a movable roller around which the wire is hung is disposed between the reel and the feed roller, and the position of the movable roller moves in response to a supply-side tension fluctuation to adjust the path length of the wire, thereby suppressing the slack of the wire and enabling the wire to be continuously fed out from the reel with a stable tension.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a processing device performs bending processing or coiling processing on a wire, the wire feeding device needs to intermittently supply the wire to the processing device. In this case, instead of a feed roller as described in Patent Document 1, a feed device that sandwiches the wire with a gripper and sends it toward the processing device is used, and it is desired that the wire can be reliably sent intermittently without slipping with respect to this feed device.

Means for Solving the Problems

[0005] In order to solve the above problems, a first aspect of one or more embodiments of the present invention is a feeding device that feeds the wire from a bobbin around which the wire is wound, applying tension, a correcting device that straightens the wire fed out from the bobbin, a gripper that clamps the wire corrected by the correcting device with a predetermined clamping force, and a feeder that applies a feed force to move the gripper in a direction opposite to the feeding device. The feed force is greater than the resultant force of the resistance force generated when moving the feeder in a state where the wire is not clamped, the inertial force related to the mass of the wire, the resistance force applied to the wire, and the frictional forces generated at each part, and the resultant force of the resistance force applied to the wire and the frictional forces generated at each part is smaller than the maximum static frictional force between the wire and the gripper generated by the clamping force. It is a wire feeding device. Smaller, it is a wire feeding device.

[0006] A second aspect of one or more embodiments of the present invention is a wire feeding method for transferring a wire with a wire feeding device. The wire feeding device is provided with a wire pressing part that fixes the wire when the wire is not clamped by the gripper in the first aspect. The maximum static friction coefficient at the wire pressing part is greater than the resultant force of the resistance force generated when moving the feeder and the negative resistance force that weakens the resistance force. It is a wire feeding method using the wire feeding device described in claim 2.

Advantages of the Invention

[0007] According to the wire feeding device according to one or more embodiments of the present invention, the wire can be reliably and intermittently fed without slipping.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

BEST MODE FOR CARRYING OUT THE INVENTION

[0009] The schematic configuration of the wire feeding device ST, which is an aspect of the embodiment of the present invention, will be described with reference to FIG. 1. The wire feeding device ST is a device that supplies a wire to the processing device 94. In FIG. 1, the vertical direction is the direction indicated by the arrow in the figure. The vertical direction in this example is the vertical direction. The wire is, for example, a flat wire, but is not limited thereto.

[0010] In FIG. 1, the processing device 94 includes a cutting unit 41 and a processing unit 42. The cutting unit 41 cuts the wire m supplied from the wire feeding device ST in a substantially horizontal posture into a predetermined length to obtain a cut wire m4. The processing unit 42 performs bending processing or the like on the cut wire m4 and discharges it to the outside as a product P.

[0011] The wire feeding device ST that supplies the wire m to the processing device 94 includes a feeding device 91, a straightening device 92, a feed device 93, and a control device 95. The feeding device 91 has a support column 10, a bobbin mounting portion 11, a tension reel 13, and a delivery reel 12.

[0012] The support column 10 and the bobbin mounting part 11 are installed on the floor FL. The bobbin mounting part 11 has a support frame 111, a driving roller 112, a driven roller 113, and a feeding motor M1. The support frame 111 pivotally supports the bobbin B detachably and rotatably. A wire rod m is wound around the bobbin B as a coiled wire body mc. The bobbin B pivotally supported by the support frame 111 is supported with respect to the floor FL via the driving roller 112 and the driven roller 113. The driving roller 112 is connected to the drive shaft of the feeding motor M1 and rotates by the operation of the feeding motor M1. Thereby, the bobbin B is rotated counterclockwise (see arrow DR11) about an axis CLB extending in the front-back direction of the paper surface of FIG. 1. The driven roller 113 rolls on the rotating bobbin B and supports the bobbin B together with the driving roller 112. The operation of the feeding motor M1 is controlled by a control device 95 (see FIG. 4).

[0013] The support column 10 is installed adjacent to the processing device 94 side of the bobbin mounting part 11. A feeding reel 12 is rotatably and immovably attached around an axis CL12 extending in the front-back direction of the paper surface of FIG. 1 at a position of the support column 10 close to the floor FL. At the upper part of the support column 10, a tension reel 13 is rotatably attached around an axis CL13 parallel to the axis CL12 and is movable only in the vertical direction (see arrow DR1). Specifically, the tension reel 13 is vertically movable so as to approach and separate from the feeding reel 12 in the support column 10. The support column 10 is provided with a tension adjusting device 14 that biases the tension reel 13 upward. The biasing force generated by the tension adjusting device 14 is, for example, by air, a coil spring, or the like.

[0014] The wire rod m of the wire body mc is drawn out from the bobbin B, wound counterclockwise around the tension reel 13, drawn downward, wound counterclockwise around the feeding reel 12 arranged below, and horizontally (parallel to the floor FL) drawn to the left in FIG. 1 from its upper end and supplied to the correcting device 92.

[0015] The straightening device 92, also known as a so-called wire straightening machine, etc., is a device that externally applies a force to straighten and deform a wire that has become non-linearly distorted due to being maintained in a coiled state for a long time, etc., into a straight line. As shown in FIG. 2, the straightening device 92 in this example includes a base 20 installed on the floor, and an H straightening unit 21 and a V straightening unit 22 arranged on the base 20.

[0016] The H straightening unit 21 has a plurality of H straightening rollers 211 arranged alternately from the front and back sides of the paper surface of FIG. 2 in the left-right direction. Then, the wire m is passed through so as to be sandwiched between the left H straightening roller 211 and the right H straightening roller 211, and a force is applied to sandwich the wire m in the left-right direction via the plurality of H straightening rollers 211 to correct the horizontal distortion of the wire m and make it straight in top view. The position of the H straightening roller 211 is determined so that a certain force for sandwiching the wire m in the left-right direction is applied.

[0017] The V straightening unit 22 has a plurality of V straightening rollers 221 arranged alternately in the vertical direction. Then, the wire m is passed through so as to be sandwiched between the upper V straightening roller 221 and the lower V straightening roller 221, and a force is applied to sandwich the wire m in the vertical direction via the plurality of V straightening rollers 221 to correct the vertical distortion of the wire m and make it straight. The position of the V straightening roller 221 is determined so that a certain force for sandwiching the wire m in the left-right direction is applied.

[0018] The wire m is distinguished as needed. The wire m1 is the one that is supplied from the feeding device 91 to the straightening device 92 after tension adjustment, and the wire m2 is the one that is straightened into a straight line by the straightening device 92 and supplied to the feed device 93. That is, the wire m1 supplied from the feeding device 91 to the straightening device 92 is straightened into a straight line by the straightening device 92 and supplied as the wire m2 to the next feed device 93 (see arrow DR92 in FIG. 2).

[0019] As shown in FIG. 3, the feed device 93 includes a base 30 installed on the floor, a feeder 3F and a wire pressing portion 3T disposed on the base 30, and a gripper 3G included in the feeder 3F.

[0020] The feeder 3F has a guide rail 31, a nut portion 32, a support column frame 33, a feed motor M3, and a feeder position sensor 36. The guide rail 31 is a rail extending in the left - right direction of the drawing in FIG. 3, and rotatably supports a ball screw 311 therein in a posture extending in the left - right direction of the drawing. The ball screw 311 is connected to the feed motor M3 and rotates by the operation of the feed motor M3. The operation of the feed motor M3 is controlled by a control device 95 (see FIG. 4).

[0021] The nut portion 32 is screwed onto the ball screw 311 and moves along the ball screw 311 by the rotation of the ball screw 311. The behavior of the moving nut portion 32 is affected by the moment of inertia according to the shape and mass of the rotating ball screw 311 and the inertial force according to the mass of the nut portion 32 itself that moves linearly. The support column frame 33 stands up integrally with the nut portion 32, and the gripper 3G is attached to the support column frame 33. Thereby, by the operation of the feed motor M3, the gripper 3G can move within the range of the distance L3 between the feed position P1 and the feed position P2 in the left - right direction of the drawing as shown by the arrow DR3 in FIG. 3.

[0022] The gripper 3G has a grip cylinder 34, a grip block 35, and a receiving part 321. The receiving part 321 is provided integrally with the nut part 32 at the upper part of the nut part 32. The grip cylinder 34 is fixed to the upper part of the support frame 33 and has a rod 341 that enters and exits downward from the lower surface. The grip block 35 is attached to the lower end of the rod 341 and a pressing part 351 is provided on the lower surface. The pressing part 351 is located directly above the receiving part 321. The height position of the upper surface of the receiving part 321 is set to match the height position of the wire rod m2 supplied from the correcting device 92. When the grip cylinder 34 is operated with the wire rod m2 placed on the upper surface of the receiving part 321, the rod 341 extends downward, and the pressing part 351 of the grip block 35 descends (see arrow DR2), and at the same time, the wire rod m2 is sandwiched between the receiving part 321 and pressed with a predetermined force. Thereby, the wire rod m2 is clamped by the gripper 3G.

[0023] The wire rod pressing part 3T has a pressing cylinder 37 and a support column 39 installed on the upper surface of the base 30, and a contact part 38 fixed to the upper part of the support column 39. The lower surface of the contact part 38 is at a height position generally corresponding to the wire rod m. A pressing part 371 is attached to the tip of the rod that enters and exits from the upper surface of the pressing cylinder 37 so as to be located directly below the contact part 38, and the pressing part 371 moves up and down so as to approach (see arrow DR4) and separate from the contact part 38 by the operation of the pressing cylinder 37. The lifting and lowering operation of the pressing cylinder 37 is controlled by the control device 95 (see Fig. 4). Thereby, when the pressing cylinder 37 operates and the pressing part 371 is in the raised position, the wire rod m is firmly clamped between the pressing part 371 and the contact part 38, and when the pressing part 371 is in the lowered position, the wire rod m is released.

[0024] The feeding device 93 can move the gripper 3G from the feeding position P1 to the feeding position P2 by operating the feeding motor M3 in a state where the wire rod pressing part 3T releases the wire rod m and the gripper 3G clamps it. Thereby, a length corresponding to the distance L3 from the feeding position P1 to the feeding position P2 of the wire rod m2 is pulled out from the side of the correcting device 92.

[0025] The position of the nut portion 32 on the ball screw 311 in the left - right direction of the paper surface in FIG. 3 is detected by the feeder position sensor 36. The detected position information J2 of the nut portion 32 is sent from the feeder position sensor 36 to the control device 95 (see FIG. 4).

[0026] As shown in FIG. 1, when the wire rod m2 is sent out from the feeding device 93, the tip portion is gripped by the grip portion 421 of the processing portion 42, and in this state, it is cut by the cutting portion 41 in front to become a cut wire rod m4. That is, the length L94 of the cut wire rod m4 from the grip portion 421 to the cutting portion 41 is set to be equal to the predetermined distance L3 for one - time feeding sent out from the feeding device 93. The cut wire rod m4 is drawn into the processing portion 42 and processed to become a product P.

[0027] As shown in FIG. 4, the control device 95 has a CPU (Central Processing Unit) 51 which is a central processing unit and a feed amount adjustment unit 52. The height position information J1 of the tension reel 13 is input to the control device 95 from the reel height sensor 101, and the position information J2 of the feeder 3F is input from the feeder position sensor 36. The control device 95 adjusts the rotation speed of the feed motor M1 as described later based on the height position information J1, etc., and controls the operations of the grip cylinder 34, the feed motor M3, and the pressing cylinder 37 based on the position information J2.

[0028] In the configuration described in detail above, the control device 95 controls the operations of each member at the timing shown in FIG. 5. FIG. 5 is a timing chart for explaining the operation of the wire feeding device ST, with the horizontal axis representing time and the vertical axis representing the opening - closing state of the wire pressing portion 3T, the opening - closing state of the gripper 3G, the operation of the feeder 3F, the position of the feeder 3F, the height position of the tension reel 13, and the rotation speed N of the bobbin B to show the time - wise transition of each.

[0029] The description of the timing is based on time t1. Immediately before time t1, the wire presser 3T is in the open state where it releases the wire m, the gripper 3G is in the closed state where it clamps the wire m, the position and movement of the feeder 3F are at the feed position P1 (see Fig. 3) on the upstream side (corrector 92 side) and in a stopped state, the position of the tension reel 13 is at the height position H2 within the vertically movable range, and the rotation speed N of the bobbin B is N1. The moving direction of the feeder 3F is defined as forward for movement toward the processing device 94 side and backward for movement toward the corrector 92 side. Therefore, forward movement is in the direction opposite to the sending device 91.

[0030] The operation of the wire feeding device ST takes one interval (time ta) from time t1 to time t2, and if there are no problems with the operation etc., it will be repeated in intervals (time t2 - t3, time t3 - t4,...).

[0031] (Time t1 - t11) The control device 95 advances the stopped feeder 3F from the feed position P1 while keeping the wire presser 3T in the open state and the gripper 3G in the closed state, and stops it at the feed position P2 that has moved a distance L3 (time t11). From time t1 to t11, the bobbin B rotates at a constant speed N1 and feeds out the wire m. The rotation speed N1 is adjusted in advance so that the length of the wire m fed out during one interval (time ta) from the bobbin B is close to the length L94. The time for the feeder 3F to move from the feed position P1 to the feed position P2 is approximately half of the time ta and is short. As a result, the length of the wire m pulled out from the sending device 91 during the time t1 - t11 when the feeder 3F moves toward the feed position P2 is longer than the length of the wire m supplied to the tension reel 13 by the constant rotation of the bobbin B during that time. Therefore, after time t1, the tension reel 13 descends against the biasing force of the tension adjusting device 14 and reaches the height position H1 at time t11 when the feeder 3F stops.

[0032] (Time t11 - t15) At time t11, even if the feeder 3F reaches the feed position P2 and stops moving, the bobbin B rotates at a constant speed and continues to supply the wire m to the tension reel 13. Therefore, due to the biasing force generated by the tension adjusting device 14, the tension reel 13 rises toward the height position H2. The control device 95 closes the wire pressing portion 3T at time t115 to make the wire m immovable, then opens the gripper 3G at time t12 to release the wire m, and retracts the feeder 3F in a state where it does not grip the wire m at time t13. When the feeder 3F retracts and reaches the feed position P1 at time t14, the control device 95 stops the retraction of the feeder 3F. Then, after closing the gripper 3G again at time t15 to clamp the wire m, the wire pressing portion 3T is opened at time t155 to release the wire m and make it movable. At time t2, the same operation as at time t1 is executed again to shift to the second section. The tension reel 13 rises from time t11 to time t2 and drops again when the feeder 3F clamps the wire m and moves forward at time t2.

[0033] As described above, the tension reel 13 absorbs the difference over time between the output force with which the wire m is intermittently drawn out toward the processing device 94 by the feeding device 93 and the input force continuously supplied from the bobbin B rotating at a constant speed through its lifting motion. Also, when the wire m is pulled by the feeding device 93, a constant tension is applied to the wire m by the biasing force of the tension adjusting device 14 to stabilize the correction action by the correction device 92 and the operation of the feeding device 93.

[0034] As shown in FIG. 6, the movable range of the tension reel 13 of the delivery device 91 is virtually divided into three small ranges. Specifically, the movable range of the tension reel 13 is divided into three small ranges A to C between the height position Ht at the uppermost end and the height position Hu at the lowermost end thereof. For example, range AA is between the height position Ht and the height position Hb, range AB is between the height position Hb and the height position Ha, and range AC is between the height position Ha and the height position Hu. For example, range AA and range AC are at the same height, and range AB is longer than range AA and range AC. The tension adjusting device 14 constantly biases the tension reel 13 upward with a biasing force F13. Thereby, by the feeding device 93, the wire m is drawn out as a wire m1 to which a tension T is applied from the feeding reel 12 (see arrow DRm).

[0035] In the normal feeding operation, as shown in FIG. 7, the wire feeding device ST is set such that the height position of the tension reel 13 is included in range AB with respect to the length L94 fed in one feed. This setting is preset according to the rotation speed N1 of the bobbin B, the biasing force F13 of the tension adjusting device 14, the diameter of the feeding reel 12, and the like. On the other hand, the height position of the tension reel 13 may deviate from range AB due to unexpected reasons or the like. Therefore, when the height position of the tension reel 13 deviates from range AB, the wire feeding device ST controls the rotation speed of the bobbin B, that is, the rotation speed of the feeding motor M1, so that the height position of the tension reel 13 is within range AB.

[0036] FIG. 7 is a graph for explaining the relationship between the transition of the height position of the tension reel 13 in the delivery device 91 and the rotation speed of the bobbin B. More specifically, it is a graph for explaining the control of the rotation speed of the bobbin B when the height position of the tension reel 13 deviates from range AB.

[0037] As shown in FIG. 7, until times tk1 to tk2, although the height position of the tension reel 13 is within the range between the height position Ha and the height position Hb, that is, within the range AB, it is assumed that at time tk21, it deviates downward to the range AC. In this case, the feed amount adjustment unit 52 of the control device 95 grasps that the height position of the tension reel 13 has deviated to the range AC based on the position information from the reel height sensor 101. Then, the feed amount adjustment unit 52 increases the rotational speed of the bobbin B, that is, the rotational speed of the feed motor M1, to raise the position of the tension reel 13, and increases the amount of the wire rod m unwound from the bobbin B per unit time. In FIG. 7, as an example, at time tk21, the rotational speed is increased from N1 to N2. Thereby, the height position of the tension reel 13 is induced to fall within the range AB from the range AC.

[0038] On the other hand, when the height position of the tension reel 13 becomes high and deviates to the range AA at time tk4, the feed amount adjustment unit 52 of the control device 95 grasps that the height position of the tension reel 13 has deviated to the range AA based on the position information from the reel height sensor 101. Thereby, the feed amount adjustment unit 52 decreases the rotational speed of the bobbin B, that is, the rotational speed of the feed motor M1, to lower the position of the tension reel 13, and decreases the amount of the wire rod m unwound from the bobbin B per unit time. In FIG. 7, as an example, at time tk4, the rotational speed is decreased from N2 to N1. Thereby, the height position of the tension reel 13 is induced to fall within the range AB from the range AA. The feed amount adjustment unit 52 may increase or decrease the rotational speed for raising and lowering not constantly but according to the degree of deviation.

[0039] When the wire feeding device ST transfers the wire m with the feeder 3F, the maximum static frictional force FNm between the wire m generated by the clamping force of the gripper 3G is generated with respect to the feeder 3F. Further, the propulsive force of the feed device 93 is, in addition to the resistance force that resists the transfer applied to the wire m in the correcting device 92 and the feeding device 91 upstream of the feed device 93, the inertial force of the feed device 93 and the wire m, and the force (feed force Ft) at the time of acceleration of a force exceeding the frictional force generated at each part is required. The wire feeding device ST applies a feed force Ft that exceeds the resultant force. Thereby, the wire m can be reliably transferred without the gripper 3G slipping. This will be described with reference to FIG. 8 which is a schematic diagram.

[0040] The tension adjusting device 14 includes a tension reel 13, and the tension reel 13 is always urged by a biasing force F13 which is a constant elastic force directed upward in the plane of FIG. 8. Therefore, as shown in FIG. 8, regardless of the buffering degree of the wire m1 fed from the feeding reel 12 of the feeding device 91, the tension adjusting device 14 always applies a constant tension (tension T) and generates a resistance force Fn1 when moving the wire m1 with the feed device 93. Further, in the correcting device 92, when the feed device 93 transfers the wire m, a resistance force Fn2 corresponding to the correction amount and the material of the wire m is generated in the wire m1.

[0041] As described above, in the feed device 93, the maximum static frictional force FNm corresponding to the clamping force Fa of the wire m by the feeder 3F is generated. Regarding the maximum static frictional force FNm, assuming that the larger of the static friction coefficients between the pressing portion 351 and the receiving portion 321 and the wire m is μ, FNm = Fa×μ ···(Equation 1) It becomes.

[0042] When driving the ball screw 311 to move the feeder 3F in a state where the wire rod m is not clamped, the resistance force (inertial force) generated is defined as the resistance force FIF, and when the force for advancing the feeder 3F having the gripper 3G by the ball screw 311 is defined as the feed force Ft, the condition is that the feed force Ft is greater than the resultant force of the resistance force FIF, the inertial force m1F related to the mass of the wire rod m, the resistance forces Fn1 and Fn2 applied to the wire rod m, and the frictional force eF generated at each part, and it is necessary to satisfy the relationship between the propulsion force and the resistance force during acceleration in the following (Equation 2). Ft > FIF + m1F + Fn1 + Fn2 + eF ···(Equation 2) Here, the resistance force Fn1 is the tension T.

[0043] Note that from (Equation 2), the wire feeding device ST is configured to satisfy at least the relationship between the maximum static frictional force and the frictional force in the following (Equation 3). FNm > Fn1 + Fn2 + eF ···(Equation 3) Physically, it is also possible to change the inequality sign > in (Equation 3) to ≥, but since the frictional force eF also has individual differences, it is preferably to use the inequality sign > substantially.

[0044] Also, the wire pressing part 3T serves to fix the wire rod m1 when the feeding device 93 is not gripping the wire rod m1. While the tension adjusting device 14 is not operating and the wire rod m1 is being gripped, a negative resistance force Fn2' that weakens the resistance force Fn1 acts, and the maximum static frictional force FNm2 can fix the wire rod m by exceeding the resultant force. FNm2 > Fn1 + Fn2' ···(Equation 4)

[0045] As described in detail above, since the wire feeding device ST according to one aspect of the present invention is configured to satisfy at least (Equation 3), the wire rod m can be reliably and intermittently fed without slipping.

[0046] One aspect of the present invention is not limited to the above-described configuration, and may be a modification within the scope not departing from the gist of the present invention.

[0047] The wire m is not limited to a flat wire and may be a round wire.

[0048] As described in detail above, one aspect of the wire feeding device of the present invention includes a feeding device 91 that feeds the wire m from a bobbin B around which the wire m is wound, while applying a tension T; a correcting device 92 that corrects the wire m fed out from the bobbin B into a straight line; a gripper 3G that clamps the wire m corrected by the correcting device 92 with a predetermined clamping force Fa; and a feeder 3F that applies a feed force Ft to the gripper 3G and moves it in a direction opposite to the feeding device 91. The feed force Ft is greater than the resultant force of the tension T and the resistance force Fn2 against movement applied to the wire m by the correcting device 92, and is smaller than the maximum static friction force FNm between the wire m and the gripper 3G generated by the clamping force Fa.

[0049] With this aspect, the wire m can be reliably and intermittently fed without slipping.

[0050] Also, in this aspect, the wire m may be a flat wire.

[0051] According to this, even when the supply destination of the wire m is a processing device that processes a flat wire to manufacture, for example, an edgewise coil or a segment conductor, the intermittent supply of the wire m can be reliably executed.

[0052] One aspect of the wire feeding device and one aspect of the wire feeding method of the present invention sandwich the wire m in its orthogonal direction and do not relatively move (do not relatively move) the clamping surface and the material surface of the wire m. That is, in the clamping method of clamping the wire m while rotating a roller or a belt, during the conveyance of the wire m, the surface of the wire m to be clamped and the clamping surface on the clamping side such as a roller always change. In this method, when the surface composed of the roller and the belt contacts the wire m, the balance between the adhesion area and the slip area is disrupted, causing the wire m to slip and the feeding length to vary. In contrast, in one aspect, there is no slip area, and the maximum static friction force FNm without such a concern can be obtained.

Description of Reference Numerals

[0053] 10 Struts 101 Reel height sensor 11 Bobbin mounting part 111 Support frame 112 Driving roller 113 Driven roller 12 Pay-off reel 13 Tension reel 14 Tension adjusting device 20 Base 21 H-correction part 211 H-correction roller 22 V-correction part 221 V-correction roller 3F Feeder 3G Gripper 3T Wire holding part 30 Base 31 Guide rail 311 Ball screw 32 Nut part 321 Receiving part 33 Strut frame 34 Gripping cylinder 341 Rod 35 Gripping block 351 Pressing part 36 Feeder position sensor 37 Holding cylinder 371 Pressing part 38 Contact part 39 Struts 41 Cutting part 42 Processing part 421 Gripping part 51 CPU (Central Processing Unit) 52 Pay-off amount adjusting part 91 Feeding device 92 Correction device 93 Feeding device 94 Processing device 95 Control device B Bobbin CL12, CL13, CLB Axes eF Frictional force Fa clamping force FL bed FNm, FNm2 maximum static friction force Fn1, Fn2, FIF, Fn2’ resistance force Ft feed force F13 biasing force H1, H2, Ha, Hb height position Ht, Hu height position J1 height position information J2 position information L3 distance L94 length m, m1, m2 wire m1F inertial force m4 cut wire mc wire reel M1 delivery motor M3 feed motor N, N1, N2 rotation speed P product P1, P2 feed position ST wire feeding device T tension μ static friction coefficient α1, α2 safety factor

Claims

1. a feeding device that feeds the wire from a bobbin around which the wire is wound, while applying tension; a straightening device that straightens the wire fed out from the bobbin; a feeding device having a gripper that grips the wire corrected by the straightening device with a predetermined clamping force, and a feeder that applies a feed force to move the gripper in a direction opposite to the feeding device; comprising: wherein the feed force is greater than the resultant force of the resistance force generated when moving the feeder in a state where the wire is not being gripped, the inertial force related to the mass of the wire, the resistance force applied to the wire, and the frictional forces generated at each part, and the resultant force of the resistance force applied to the wire and the frictional forces generated at each part is smaller than the maximum static frictional force between the wire and the gripper generated by the clamping force, a wire feeding device.

2. comprising a wire pressing portion that fixes the wire when it is not being gripped by the gripper; the wire feeding device according to claim 1, wherein the maximum static frictional force at the wire pressing portion exceeds the resultant force of the resistance force generated when moving the feeder and a negative resistance force that weakens the resistance force.

3. the wire feeding device according to claim 1 or claim 2, wherein during conveyance of the wire, the clamping surface of the wire being gripped by the gripper and the clamping surface of the gripper gripping the wire do not move relative to each other.

4. a wire feeding method for transferring a wire with a wire feeding device, the wire feeding method using the wire feeding device according to claim 2.

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