Tape feeder and taping machine

Abstract

To provide a tape feeder and a taping machine which are advantageous for feeding a carrier tape so as to position each storage section at a desired position with high accuracy. [Solution] A tape feeding device that feeds a carrier tape having a plurality of workpiece storage sections includes a control device that performs a correction process to determine a transport correction amount for a carrier tape reference transport amount and determines a tape transport amount based on the transport reference amount and the transport correction amount, a transport device that transports the carrier tape along a transport path according to the tape transport amount, and a deviation amount acquisition device that acquires a positional deviation amount of each storage section on the transport path. In the correction process, the transport correction amount is determined based on the positional deviation amount of each storage section, and if the positional deviation amount is within an allowable range (Y in S16), the value of the transport correction amount is zero (S12), and if the positional deviation amount exceeds the allowable range (N in S16), the value of the transport correction amount is a value other than zero (S13).

Description

Technical Field

[0001] The present disclosure relates to a tape feeding device and a taping machine.

Background Art

[0002] There is known a taping machine that seals workpieces (such as electronic components) housed in a number of recesses provided in a carrier tape by thermocompression bonding a top tape to the carrier tape (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to house workpieces in each of a number of recesses (accommodation portions) provided in the carrier tape, while the carrier tape is being fed so that the recesses are sequentially positioned at predetermined insertion positions, the workpieces are inserted into each of the recesses that are sequentially positioned at the insertion positions.

[0005] However, due to various factors such as manufacturing errors, not all of the number of recesses provided in the carrier tape are necessarily accurately formed at the desired positions on the carrier tape, and may include recesses formed at positions deviated from the original positions.

[0006] When a recess is formed at such a displaced position, when the workpiece is inserted, it will actually be placed at a position displaced from the insertion position, and the workpiece may not be properly inserted (accommodated). Also, in some cases, the carrier tape (for example, the edge portion defining the recess) and the workpiece may collide with each other unintentionally and receive a large force, and as a result, there is also a concern that the carrier tape and / or the workpiece may be damaged.

[0007] The present disclosure has been made in view of the above circumstances, and provides a tape feeding device and a taping machine that are advantageous for transporting a carrier tape so as to accurately position each accommodating portion at a desired position.

Means for Solving the Problems

[0008] One aspect of the present disclosure is a tape feeding device that feeds a carrier tape having a plurality of accommodating portions for workpieces, the tape feeding device including: a control device that performs correction processing to determine a conveyance correction amount with respect to a conveyance reference amount of the carrier tape, and determines a tape conveyance amount based on the conveyance reference amount and the conveyance correction amount; a conveyance device that conveys the carrier tape along a conveyance path according to the tape conveyance amount; and a deviation amount acquisition device that acquires a position deviation amount of each accommodating portion in the conveyance path. In the correction processing, the conveyance correction amount is determined based on the position deviation amount of each accommodating portion. When the position deviation amount is within an allowable range, the value of the conveyance correction amount is zero, and when the position deviation amount exceeds the allowable range, the value of the conveyance correction amount is a non-zero value.

[0009] The carrier tape may have a plurality of position reference portions provided at equal intervals, and the deviation amount acquisition device may acquire the position deviation amount of each accommodating portion by comparing the positions of the plurality of position reference portions and the positions of the plurality of accommodating portions.

[0010] The carrier tape may have a plurality of conveyance holes, the conveyance device may have a conveyance body, and the carrier tape may be conveyed by applying a conveyance force from the conveyance body to the carrier tape in a state where the conveyance body is inserted into one or more conveyance holes. The deviation amount acquisition device may use the plurality of conveyance holes as a plurality of position reference portions.

[0011] The conveyance device may have a conveyance motor that operates in response to a drive signal input under the control of a control device. The conveyance amount of the carrier tape by the power output from the conveyance motor may be determined according to the number of pulses of the drive signal. The control device may determine the number of pulses of the drive signal based on a reference pulse number corresponding to a conveyance reference amount and a correction pulse number corresponding to a conveyance correction amount.

[0012] The control device may determine the pulses of the drive signal based on the correction pulse number so that the conveyance motor operates at a pulse rate corresponding to the reference pulse number and the correction pulse number.

[0013] Another aspect of the present disclosure relates to a taping machine including the above-described tape feeding device that feeds a carrier tape having a plurality of storage portions for workpieces, and a tape joining device that joins a top tape to the carrier tape so as to cover the plurality of storage portions.

Advantages of the Invention

[0014] According to the present disclosure, it is possible to provide a tape feeding device and a taping machine that are advantageous for conveying the carrier tape so as to accurately position each storage portion at a desired position.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the disclosed technology will be described with reference to the drawings.

[0017] In the following description, the terms "upstream" and "downstream" are based on the running direction of various tapes (carrier tape, top tape, and work sealing tape) during the normal operation of the taping machine 10, and the various tapes are fed from upstream to downstream.

[0018] FIG. 1 is a diagram showing a schematic configuration of an example of the taping machine 10.

[0019] The taping machine 10 shown in FIG. 1 includes a carrier tape feeding device for feeding a carrier tape Ta, a top tape feeding device for feeding a top tape Tb, and a tape joining device 27 for joining the top tape Tb to the carrier tape Ta to form a work sealing tape Tc.

[0020] The carrier tape Ta has a plurality of bottomed recesses used as accommodation portions for workpieces. Each recess is inserted and accommodated with a workpiece (in this example, an electronic component such as a capacitor) by a workpiece supply device 30. The top tape Tb is overlapped on the carrier tape Ta so as to cover the recesses in which the workpieces are accommodated, and is thermocompression bonded to the carrier tape Ta by a tape bonding device 27. In the workpiece sealing tape Tc thus produced, the workpieces accommodated in the respective recesses are individually sealed by the carrier tape Ta and the top tape Tb. Note that the carrier tape Ta and the top tape Tb can be made of, for example, resin and / or paper, but can be made of any other material capable of appropriately performing the bonding (in this example, thermocompression bonding) between each other.

[0021] The carrier tape Ta is conveyed along the conveyance path P by a conveyance device 20. After being fed out from a carrier tape supply roller 15, it is guided by a guide roller R and sequentially sent to a displacement acquisition position P1, a workpiece supply position P2, and a bonding position P3.

[0022] The top tape Tb is fed out from a top tape supply roller 16 and then sent to the bonding position P3 while being guided by the guide roller R. The top tape Tb in this example is conveyed downstream together with the carrier tape Ta as the workpiece sealing tape Tc after being bonded to the carrier tape Ta by a tape bonding device 27 at the bonding position P3. Therefore, the top tape Tb is fed out from the top tape supply roller 16 and conveyed toward the bonding position P3 by the conveyance force received from the carrier tape Ta in the state of the workpiece sealing tape Tc.

[0023] The workpiece sealing tape Tc is sent downstream by the conveyance force with which the conveyance device 20 sends out the carrier tape Ta downstream, and is finally wound around a tape take-up roller 17. The tape take-up roller 17 is actively rotated by a driving device (such as a motor) (not shown) and actively winds up the workpiece sealing tape Tc sent from the tape bonding device 27.

[0024] The work supply device 30 shown in Fig. 1 has a parts feeder 31 and an index table 32. The parts feeder 31 is supplied with a large number of workpieces by manual or mechanical means, and supplies the supplied workpieces to the index table 32 one by one.

[0025] The index table 32 conveys the workpieces supplied from the parts feeder 31 to the work supply position P2. The workpieces successively conveyed to the work supply position P2 by the index table 32 are inserted and stored in the storage portion of the carrier tape Ta at the work supply position P2. In the example shown in Fig. 1, the index table 32 intermittently rotates about a rotation center axis extending along the height direction (vertical direction), but is not limited thereto. For example, the rotation center axis of the index table 32 may extend along a direction inclined with respect to the height direction, or may extend along the horizontal direction.

[0026] The method for storing the workpieces from the index table 32 into the storage portion of the carrier tape Ta is not limited, and any method can be used. For example, a loading device (not shown) may apply a force to the workpiece located at the work supply position P2 in a contact or non-contact manner to move the workpiece into the storage portion, or the workpiece located at the supply position P2 may be moved into the storage portion using gravity.

[0027] The conveying device 20 shown in Fig. 1 is provided at the work supply position P2, and by applying a force while contacting the portion of the carrier tape Ta located at the work supply position P2, the carrier tape Ta is sent out downstream. Thus, the conveying device 20 of this example can convey the carrier tape Ta so as to accurately adjust the position of the carrier tape Ta at the work supply position P2.

[0028] Upstream of the work supply position P2 (in the example shown in FIG. 1, between the carrier tape supply roller 15 and the work supply device 30 (particularly the index table 32)), a deviation amount acquisition device 25 is provided. The deviation amount acquisition device 25 acquires the position deviation amount of each accommodation part of the carrier tape Ta in the conveyance path P. The "position deviation amount" mentioned here refers to the deviation amount from the desired position of the carrier tape Ta where the accommodation part is originally scheduled to be arranged. The position deviation amount of each accommodation part acquired by the deviation amount acquisition device 25 includes the position deviation amount in the conveyance direction Dt of the carrier tape Ta (hereinafter also referred to as the "tape conveyance direction").

[0029] FIG. 2 is a functional block diagram showing an example of the connection configuration of the control device 40, the deviation amount acquisition device 25, and the conveyance device 20 (particularly the conveyance motor 21).

[0030] The deviation amount acquisition device 25 shown in FIG. 2 transmits a deviation amount signal Sm indicating the position deviation amount of each accommodation part to the control device 40.

[0031] The control device 40 performs correction processing to determine the conveyance correction amount with respect to the conveyance reference amount of the carrier tape Ta, determines the tape conveyance amount based on the conveyance reference amount and the conveyance correction amount, and transmits a motor drive signal Sd corresponding to the determined tape conveyance amount to the conveyance motor 21 of the conveyance device 20. The conveyance motor 21 operates based on the motor drive signal Sd from the control device 40. As a result, the conveyance device 20 is driven so that the carrier tape Ta is conveyed by the conveyance device 20 by the tape conveyance amount corresponding to the motor drive signal Sd.

[0032] In the above-described correction process performed by the control device 40, the conveyance correction amount is determined based on the amount of positional deviation of each storage unit indicated by the deviation amount signal Sm. The tape conveyance amount is determined for each storage unit, and a corresponding tape conveyance amount is assigned to each storage unit. When the conveyance device 20 positions each storage unit at the work supply position P2, by conveying the carrier tape Ta downstream by the corresponding tape conveyance amount, it is possible to accurately position all the storage units provided on the carrier tape Ta at the work supply position P2 individually.

[0033] In particular, in the control device 40 of the present embodiment, when the amount of positional deviation of each storage unit is within the allowable range, the value of the corresponding conveyance correction amount is set to zero, and when the amount of positional deviation of each storage unit exceeds the allowable range, the value of the corresponding conveyance correction amount is set to a non-zero value.

[0034] The value (boundary value) that defines the "allowable range" here is not limited, but it is preferably determined based on the size (length) of each storage unit and the size of the work (particularly, the length of the work in the tape conveyance direction Dt based on the posture of the work when being stored in the storage unit) in the longitudinal extension direction of the carrier tape Ta (corresponding to the tape conveyance direction Dt). That is, even if the work inserted into the storage unit is relatively displaced in the tape conveyance direction Dt with respect to the carrier tape Ta (particularly the corresponding storage unit where insertion is planned), it is preferable that the allowable range is determined so that the work can be appropriately inserted into the corresponding storage unit. Therefore, it is preferable that the absolute value of the boundary value of the "allowable range" here is equal to or less than the difference between the "size of the work" and the "size of the corresponding storage unit" in the tape conveyance direction Dt, and it is more preferably smaller than the difference. For example, it may have a size smaller than 50% of the difference, and as an example, 10 μm ル It may be any of the following values. Also, the "size of the work" may be the nominal size of the work.

[0035] FIG. 3 is an enlarged plan view showing a schematic configuration of an example of the carrier tape Ta. FIG. 4 is a side view showing a schematic configuration of an example of the conveyance device 20.

[0036] The carrier tape Ta may have a plurality of position reference portions, and such a plurality of position reference portions may be provided at equal intervals in the tape conveyance direction Dt (the extending direction of the carrier tape Ta). In this case, the deviation amount acquisition device 25 can acquire the position deviation amount of each accommodation portion 52 by comparing the positions of such a plurality of position reference portions with the positions of the plurality of accommodation portions 52.

[0037] The carrier tape Ta shown in FIG. 3 has a plurality of conveyance holes 51 arranged linearly in the extending direction (corresponding to the tape conveyance direction Dt), and a plurality of accommodation portions 52 arranged linearly on another straight line in the extending direction. Both the plurality of conveyance holes 51 and the plurality of accommodation portions 52 are basically provided on the carrier tape Ta so as to be arranged at equal intervals with respect to the extending direction (tape conveyance direction Dt) of the carrier tape Ta. The interval (pitch) between the accommodation portions 52 with respect to the extending direction (tape conveyance direction Dt) of the carrier tape Ta is not limited, but for example, the plurality of accommodation portions 52 can be provided at a pitch of 1 mm, 2 mm, or 4 mm.

[0038] In particular, each conveyance hole 51 is basically formed accurately at a desired position on the carrier tape Ta without positional deviation (especially without positional deviation with respect to the extending direction (tape conveyance direction Dt) of the carrier tape Ta). On the other hand, each accommodation portion 52 may have a positional deviation with respect to the extending direction (tape conveyance direction Dt) of the carrier tape Ta due to manufacturing errors or the like, and the relative position with respect to the associated conveyance hole 51 (one or two conveyance holes 51 located closest in this example) may deviate from the desired relative position.

[0039] The conveyance device 20 shown in FIG. 4 has a conveyance motor 21 (only the rotation shaft of the conveyance motor 21 is shown in FIG. 4) and a conveyance body 22 rotated by the conveyance motor 21. With the protruding portions of the conveyance body 22 protruding radially outward inserted into one or more conveyance holes 51, when the conveyance body 22 is rotated by the conveyance motor 21, a conveyance force acts on the carrier tape Ta from the conveyance body 22, and the carrier tape Ta is conveyed in the tape conveyance direction Dt.

[0040] When the carrier tape Ta is conveyed by rotating the protruding portion of the carrier 22 while the protruding portion of the carrier 22 is inserted into the conveyance hole 51 as described above, the conveyance hole 51 moves in the tape conveyance direction Dt by an amount corresponding to the rotation amount of the protruding portion of the carrier 22. As a result, the carrier tape Ta is conveyed in the tape conveyance direction Dt by a desired amount.

[0041] The deviation amount acquisition device 25 of the present embodiment uses such a plurality of conveyance holes 51 as the plurality of position reference portions described above.

[0042] In the example shown in FIG. 3, the plurality of accommodating portions 52 of the carrier tape Ta include an accommodating portion 52 provided so that the position in the carrier tape extending direction (tape conveyance direction Dt) coincides with each conveyance hole 51, and an accommodating portion 52 provided so that the position in the carrier tape extending direction coincides with the central position between adjacent conveyance holes 51.

[0043] A virtual line (i.e., a first auxiliary line extending in a direction perpendicular to the carrier tape extending direction) L1 passing through the center of the accommodating portion 52 provided so that the position in the conveyance hole 51 and the carrier tape extending direction coincide and extending in the tape width direction Dw passes through the center of the corresponding conveyance hole 51 when the accommodating portion 52 is provided at a desired position of the carrier tape Ta. Further, the first auxiliary line L1 passing through the center of the accommodating portion 52 provided so that the position in the carrier tape extending direction coincides with the central position between adjacent conveyance holes 51 and extending in the tape width direction Dw passes through the central position between the corresponding adjacent conveyance holes 51 when the accommodating portion 52 is arranged at a desired position.

[0044] Therefore, the amount of displacement of the accommodating portion 52 provided so that the position in the carrier tape extending direction coincides with the conveying hole 51 can be obtained based on the difference (distance) in position in the carrier tape extending direction (tape conveying direction Dt) between the center of the accommodating portion 52 and the center of the corresponding conveying hole 51. Similarly, the amount of displacement of the accommodating portion 52 provided so that the position in the carrier tape extending direction coincides with the central position between adjacent conveying holes 51 can be obtained based on the difference (distance) in position in the carrier tape extending direction (tape conveying direction Dt) between the center of the accommodating portion 52 and the center of one or both of the corresponding two adjacent conveying holes 51. When obtaining the amount of displacement of the accommodating portion 52 in this way, a first auxiliary line L1 passing through the center of each conveying hole 51 and / or each accommodating portion 52 and extending in the tape width direction Dw, or a second auxiliary line L2 passing through the centers of a plurality of conveying holes 51 and extending in the carrier tape extending direction (tape conveying direction Dt) may or may not be used.

[0045] In order to obtain the amount of displacement of each accommodating portion 52 based on the above-described method, the displacement amount acquisition device 25 may include an imaging device (not shown) that images the carrier tape Ta at the displacement acquisition position P1, and an image analysis device (not shown) that analyzes the captured image acquired by the imaging device. In this case, under the control of the control device 40, the imaging device of the displacement amount acquisition device 25 acquires a captured image regarding each accommodating portion 52 so that each accommodating portion 52 is captured together with the corresponding one or more conveying holes 51, and the image analysis device acquires the amount of displacement of each accommodating portion 52 by analyzing the captured image.

[0046] The imaging device of the displacement amount acquisition device 25 may simultaneously image two or more accommodating portions 52 and one or more conveying holes 51 corresponding to the two or more accommodating portions 52, and cause the two or more accommodating portions 52 and the corresponding one or more conveying holes 51 to be captured in a single captured image. In this case, the image analysis device can obtain the amount of displacement of the two or more accommodating portions 52 from such a single captured image.

[0047] [Example of Determining Tape Conveying Amount] Next, an example of a method for determining the tape conveyance amount will be described.

[0048] In the example shown below, the conveyance motor 21 of the conveyance device 20 is constituted by a stepping motor, and the conveyance amount of the carrier tape Ta by the output power from the conveyance motor 21 is determined based on the number of pulses of the motor drive signal Sd input to the conveyance motor 21.

[0049] The circumferential movement amount (resolution) A [μm / pulse] of the carrier 22 (conveyance device 20) corresponding to one pulse of the motor drive signal Sd, the number of pulses (reference pulse number) B [pulses] of the motor drive signal Sd required to move the carrier 22 by the conveyance reference amount in the circumferential direction, and the circumferential movement amount (conveyance reference amount) C [μm] of the carrier 22 when the motor drive signal Sd of the reference pulse number B is input to the conveyance motor 21 are represented by the following relational expressions.

[0050] A = C / B [μm / pulse]

[0051] The "conveyance reference amount C" mentioned here corresponds to the distance (pitch) in the carrier tape extending direction (tape conveyance direction Dt) between adjacent accommodating portions 52 when it is assumed that each accommodating portion 52 is accurately provided at a desired position in the carrier tape Ta in the carrier tape extending direction.

[0052] When the amount of displacement of the accommodating portion 52 in the tape conveyance direction Dt is represented by "E", the quotient of "E / A" is represented by "q", and the remainder of "E / A" is represented by "r", the remainder r is represented by the following relational expression.

[0053] r = |E - (A × q)|

[0054] The "amount of displacement E [μm]" mentioned here corresponds to the conveyance correction amount with respect to the conveyance reference amount C of the carrier tape Ta, and is represented by plus (+) when the accommodating portion 52 is displaced to the forward direction side (the right side shown by the arrow Dt in FIG. 3) with respect to the desired position, and is represented by minus (-) when it is displaced to the reverse direction side (the left side in FIG. 3).

[0055] And the number of correction pulses D [pulses] corresponding to the amount of displacement E [μm] of the storage portion 52 (a square hole pocket in the example shown in FIG. 3) is determined based on the following relational expression.

[0056] · When "(A / 2) <r (i.e., A / 2 <| E - (A×q) |)" is satisfied: D = q + 1

[0057] · When "r ≤ (A / 2) (i.e., | E - (A×q) | ≤ (A / 2))" is satisfied: D = q

[0058] The number of correction pulses D [pulses] mentioned here is expressed as an absolute value without the polarity of "plus" / "minus".

[0059] The control device 40 determines the number of drive pulses F of the motor drive signal Sd corresponding to the tape conveyance amount based on the "reference pulse number B corresponding to the conveyance reference amount C" and the "correction pulse number D corresponding to the conveyance correction amount (displacement amount E)" obtained as described above. In particular, the control device 40 of this example determines the drive pulse number F by performing a correction process considering the "differential cumulative pulse number G of the drive pulse number F with respect to the reference pulse number B". The "differential cumulative pulse number G" mentioned here corresponds to the displacement amount E of the preceding storage portion 52 (hereinafter also referred to as "preceding storage portion 52") positioned at the work supply position P2 immediately before the target storage portion 52 (hereinafter also referred to as "target storage portion 52").

[0060] That is, the tape conveyance amount (drive pulse number F) is derived by performing correction based on the conveyance correction amount (correction pulse number D) for canceling the displacement amount E of the target storage portion 52 in addition to the correction based on the cumulative correction amount (differential cumulative pulse number G) for canceling the displacement amount E of the preceding storage portion 52 with respect to the conveyance reference amount C (reference pulse number B).

[0061] More specifically, the method for calculating the number of drive pulses F is classified as follows based on the conveyance correction amount (position deviation amount E) and the differential cumulative pulse number G. Note that the differential cumulative pulse number G is represented by plus (+) when the preceding accommodation unit 52 is displaced toward the traveling direction side (the right side indicated by the arrow Dt in FIG. 3) with respect to the desired position, and is represented by minus (-) when it is displaced toward the reverse traveling direction side (the left side in FIG. 3).

[0062] · When “E < 0” and “G < 0” are satisfied: F = B + D + |G|

[0063] · When “E < 0” and “G = 0” are satisfied: F = B + D

[0064] · When “E < 0” and “0 < G” are satisfied: F = B + D - |G|

[0065] · When “0 < E” and “0 < G” are satisfied: F = B - D - |G|

[0066] · When “0 < E” and “G = 0” are satisfied: F = B - D

[0067] · When “0 < E” and “G < 0” are satisfied: F = B - D + |G|

[0068] · When “E = 0” and “0 < G” are satisfied: F = B - |G|

[0069] · When “E = 0” and “G = 0” are satisfied: F = B

[0070] · When “E = 0” and “G < 0” are satisfied: F = B + |G|

[0071] Note that, as described above, in this embodiment, when the amount of displacement E of each storage unit 52 is within the allowable range, the conveyance correction amount (correction pulse number D) is zero (0), and when the amount of displacement E of each storage unit 52 exceeds the allowable range, the conveyance correction amount (correction pulse number D) is other than zero (0). Therefore, the above formula for calculating the drive pulse number F is modified as follows in view of such an allowable range.

[0072] In the following formula, the plus-side boundary value of the allowable range is represented by "H1", and the minus-side boundary value of the allowable range is represented by "H2". The plus-side boundary value H1 is a value that defines the allowable range when the target storage unit 52 is displaced to the advancing direction side (the right side indicated by the arrow Dt in FIG. 3), and has a plus polarity. On the other hand, the minus-side boundary value H2 is a value that defines the allowable range when the target storage unit 52 is displaced to the reverse advancing direction side (the left side in FIG. 3), and has a minus polarity.

[0073] · When "H2 ≤ E ≤ H1" and "G < 0" are satisfied: F = B + |G|

[0074] · When "H2 ≤ E ≤ H1" and "G = 0" are satisfied: F = B

[0075] · When "H2 ≤ E ≤ H1" and "0 < G" are satisfied: F = B - |G|

[0076] · When "E < H2" and "G < 0" are satisfied: F = B + D + |G|

[0077] · When "E < H2" and "G = 0" are satisfied: F = B + D

[0078] · When "E < H2" and "0 < G" are satisfied: F = B + D - |G|

[0079] · When "H1 < E" and "0 < G" are satisfied: F = B - D - |G|

[0080] · When the conditions of "H1 < E" and "G = 0" are satisfied: F = B - D

[0081] · When the conditions of "H1 < E" and "G < 0" are satisfied: F = B - D + |G|

[0082] After determining the number of drive pulses F as described above, the control device 40 may determine the pulses of the motor drive signal Sd based on the correction pulse number D so that the conveyance motor 21 is driven at a pulse rate corresponding to the number of drive pulses F based on the reference pulse number B and the correction pulse number D. The pulse rate mentioned here represents the speed of the conveyance motor (stepping motor) 21, is expressed by the number of pulses per unit time, and is generally often expressed in the unit of pps (pulse per second).

[0083] Generally, the rotor of a stepping motor operates by the attractive force and repulsive force generated by sequentially switching the excitation of the part that functions as the electromagnet of the stator. The rotor that operates in this way may be stopped at a stable point while undergoing damped vibration (damping), but may also be stopped between stable points in some cases such as when microstepping is used. When the rotor is stopped at a position between stable points (that is, a position other than the stable point) in this way, the damping tends to increase under the influence of inertia and the like. Therefore, from the viewpoint of suppressing damping, it is preferable that the rotor stops at a stable point. The "stable point" mentioned here is a position determined based on the torque due to the magnetic force acting between the stator and the rotor. For example, the rotor can stop at the stable point when no external force acts.

[0084] On the other hand, the stop position of the rotor is also affected by the pulse rate.

[0085] Therefore, when the control device 40 applies the motor drive signal Sd having the number of drive pulses F determined as described above to the transport motor 21 for each storage unit 52, it is advantageous for suppressing dithering to select a pulse rate at which the rotor can stop at a stable point and determine the pulses of the motor drive signal Sd based on the pulse rate.

[0086] Specifically, since the number of drive pulses F of the motor drive signal Sd in the present embodiment is determined based on the reference number of pulses B and the correction number of pulses D, the pulse rate optimal for suppressing dithering with respect to such a number of drive pulses F is the pulse rate selected based on the reference number of pulses B and the correction number of pulses D. Therefore, the pulses of the motor drive signal Sd corresponding to such an optimal pulse rate can be determined based on the correction number of pulses D.

[0087] In the above example, the number of drive pulses F is determined based not only on the correction number of pulses D but also on the differential cumulative number of pulses G. In this case, the pulses of the motor drive signal Sd may be determined based on the correction number of pulses D and the differential cumulative number of pulses G so that the transport motor 21 is driven at a pulse rate corresponding to the reference number of pulses B, the correction number of pulses D, and the differential cumulative number of pulses G.

[0088] [Tape Feeding Method] FIG. 5 is a flowchart showing an example of a tape feeding method for feeding the carrier tape Ta by the taping machine 10 (particularly the carrier tape feeding device). FIG. 6 is a flowchart showing an example of a correction processing method.

[0089] According to the tape feeding method shown in FIG. 5, the amount of positional deviation of each storage unit 52 of the carrier tape Ta is acquired by the deviation amount acquisition device 25 (S1 in FIG. 5).

[0090] Then, correction processing is performed by the control device 40, and the tape conveyance amount for each storage unit 52 is determined (S2). In the example of the correction processing method shown in FIG. 6, the control device 40 determines whether or not the amount of positional deviation of the tape conveyance direction Dt for each storage unit 52 is within the allowable range (S11 in FIG. 6). When the amount of positional deviation of the storage unit 52 is within the allowable range (Y in S11), the control device 40 sets the value of the conveyance correction amount for the storage unit 52 to "0 (zero)" (S12). On the other hand, when the amount of positional deviation of the storage unit 52 exceeds the allowable range (N in S11), the control device 40 determines a value other than "0" for the conveyance correction amount for the storage unit 52 according to the amount of positional deviation (S13). Then, the control device 40 determines the tape conveyance amount for each storage unit 52 based on the conveyance reference amount and the conveyance correction amount as described above (S14).

[0091] Then, the conveyance device 20 conveys the carrier tape Ta in the tape conveyance direction Dt by the tape conveyance amount assigned to each storage unit 52 (S3), and each storage unit 52 can be accurately arranged at the work supply position P2. As a result, the work from the work supply device 30 (particularly the index table 32) can be accurately inserted into each storage unit 52 at the work supply position P2.

[0092] As described above, according to the taping machine 10 and the carrier tape feeding device of the present embodiment, correction processing based on the amount of positional deviation of each storage unit 52 is performed to determine the tape conveyance amount, so that each storage unit 52 can be accurately positioned at the work supply position P2.

[0093] In particular, when determining the conveyance correction amount, it is evaluated whether or not to set the conveyance correction amount to "0 (zero)" by comparing the amount of positional deviation of each storage unit 52 with the allowable range. By providing a dead zone where the conveyance correction amount is "0 (zero)" in this way, an improvement in processing speed can be expected.

[0094] As described above, according to the present embodiment, it is possible to achieve a good balance between the high-precision positioning of each storage unit 52 at the work supply position P2 and the simplification of the conveyance adjustment process of the carrier tape Ta.

[0095] [Modification Example] In the above-described embodiment, the single deviation amount acquisition device 25 has an imaging device and an image analysis device. However, the imaging device and the image analysis device may be provided as separate devices. For example, the deviation amount acquisition device 25 may have an imaging device but not necessarily an image analysis device, and the control device 40 or another device may have an image analysis device. In this case, the control device 40 or another device analyzes the captured image sent from the deviation amount acquisition device 25, and thus functions substantially as "the deviation amount acquisition device 25 that acquires the deviation amount of the position of each housing portion 52".

[0096] It should be noted that the embodiments and modification examples disclosed in this specification are merely illustrative in all respects and should not be construed in a limiting sense. The above-described embodiments and modification examples can be omitted, substituted, and changed in various forms without departing from the scope and spirit of the appended claims. For example, the above-described embodiments and modification examples may be combined in whole or in part, or embodiments other than the above may be combined with the above-described embodiments or modification examples. Also, the effects of the present disclosure described in this specification are merely illustrative, and other effects may be brought about.

[0097] The technical category for embodying the above-described technical idea is not limited. For example, the above-described technical idea may be embodied by a computer program for causing a computer to execute one or more procedures (steps) included in a method for manufacturing or using the above-described device. Also, the above-described technical idea may be embodied by a computer-readable non-transitory recording medium on which such a computer program is recorded.

Description of Reference Numerals

[0098] 10 Taping machine, 15 Carrier tape supply roller, 16 Top tape supply roller, 17 Tape recovery roller, 20 Conveying device, 21 Conveying motor, 22 Conveyor, 25 Deviation amount acquisition device, 27 Tape joining device, 30 Work supply device, 31 Parts feeder, 32 Index table, 40 Control device, 51 Conveying hole, 52 Accommodation part, B Reference pulse number, C Conveying reference amount, D Correction pulse number, Dt Tape conveying direction, Dw Tape width direction, L1 First auxiliary line, L2 Second auxiliary line, P Conveying path, P1 Position deviation acquisition position, P2 Work supply position, P3 Joining position, R Guide roller, Sm Deviation amount signal, Sd Motor drive signal, Ta Carrier tape, Tb Top tape, Tc Work sealing tape

Claims

1. A tape feeding device that feeds a carrier tape having a plurality of workpiece storage sections in a tape feeding direction, a control device that performs a correction process to determine a transport correction amount for a transport reference amount of the carrier tape, and determines a tape transport amount based on the transport reference amount and the transport correction amount; a conveying device that conveys the carrier tape along a conveying path based on the tape conveying amount; a displacement amount acquisition device that acquires a positional displacement amount of each storage unit on the transport path, In the correction process, the transport correction amount is determined based on the positional deviation amount of each storage unit, When the positional deviation amount is within a tolerable range, the value of the transport correction amount is zero. When the positional deviation amount exceeds the allowable range, the value of the transport correction amount is a value other than zero. The tolerance is determined so that an absolute value of a boundary value of the tolerance is equal to or smaller than a difference between a size of the workpiece in the tape transport direction and a size of the corresponding accommodation portion. Tape feed device.

2. the carrier tape has a plurality of position reference portions provided at equal intervals; the deviation amount acquisition device acquires the position deviation amount of each of the storage units by comparing positions of the plurality of position reference units with positions of the plurality of storage units.

2. The tape transport device of claim 1.

3. the carrier tape has a plurality of conveying holes; the conveying device has a conveying body, and conveys the carrier tape by applying a conveying force from the conveying body to the carrier tape while the conveying body is inserted into one or more conveying holes; the deviation amount acquisition device uses the plurality of conveyance holes as the plurality of position reference portions; 3. The tape transport device according to claim 2.

4. the transport device has a transport motor that operates based on a drive signal input under the control of the control device; a transport amount of the carrier tape by the power output from the transport motor is determined based on the number of pulses of the drive signal, the control device determines a number of pulses of the drive signal based on a reference pulse number corresponding to the transport reference amount and a correction pulse number corresponding to the transport correction amount.

2. The tape transport device of claim 1.

5. the control device determines the pulses of the drive signal based on the correction pulse number so that the carry motor operates at a pulse rate according to the reference pulse number and the correction pulse number.

5. The tape transport device according to claim 4.

6. The tolerance range is determined such that the absolute value of the boundary value of the tolerance range is 10 micrometers or less.

2. The tape transport device of claim 1.

7. A tape feeding device according to any one of claims 1 to 6, which feeds a carrier tape having a plurality of workpiece storage sections; a tape splicing device that splices a top tape onto the carrier tape so as to cover the plurality of housing portions; A taping machine comprising:

Images