JP3885547B2 - Tape feeder and tape feeding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tape feeder and a tape feeding method in which an electronic component held on a tape is pitch-fed and supplied to a pickup position of an electronic component mounting apparatus.
[0002]
[Prior art]
In an electronic component mounting apparatus, a method using a tape feeder is known as a method for supplying an electronic component to a pickup position of a nozzle of a transfer head. In this method, a tape for holding an electronic component is pulled out from a supply reel, and pitch-fed in synchronization with the mounting timing of the electronic component to be supplied to a nozzle. In this tape feeder, the tape is pitch-fed by rotating a sprocket engaged with a feed hole provided in the tape by a predetermined amount.
[0003]
As a method for operating these tape feeders, a method in which a large number of tape feeders of the same type are provided and these tape feeders are mounted on a plurality of electronic component mounting apparatuses as required is generally used. In other words, regarding a specific feeder mounting base of the electronic component mounting apparatus, an unspecified number of tape feeders having mounting compatibility are mounted. These tape feeders supply electronic components by feeding the tape to the pickup position of the transfer head.
[0004]
[Problems to be solved by the invention]
However, these many tape feeders have a tape feeding error due to individual instrumental differences, and the tape feeding position does not always coincide with the pickup position by the transfer head. For this reason, conventionally, mechanical adjustment work such as position adjustment of an alignment pin is required for each tape feeder, and a great deal of labor has been required when a large number of tape feeders are targeted.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a tape feeder and a tape feeding method that can reduce work for positioning the tape feeder and improve work efficiency.
[0006]
[Means for Solving the Problems]
The tape feeder according to claim 1 is a tape feeder that feeds an electronic component to a pickup position of an electronic component mounting apparatus by pitch-feeding a tape holding the electronic component, and is a feed provided at a constant pitch on the tape. A sprocket that meshes with the hole and feeds the tape, a sprocket drive mechanism that rotates the sprocket using a motor whose rotation amount can be controlled as a drive source, a motor control unit that controls the motor, and an electronic component located at the pickup position A stop position data storage unit that stores stop position data obtained as rotation amount data of the motor corresponding to the rotation stop position of the sprocket in a state where the rotation is stopped, as the inherent offset data of the tape feeder, and the rotation stop position Is the position from the normal position of each pin of the sprocket The stop position data is obtained by measuring the amount of misalignment stored as offset data in the storage unit of the electronic component mounting apparatus into the amount of pulse data indicating the amount of rotation of the motor. Is written in the stop position data storage unit via the communication unit of the tape feeder .
[0007]
The tape feeder according to claim 2 is the tape feeder according to claim 1, wherein the stop position data is obtained by statistically processing pin positions measured for all pins of the sprocket, and the tape feeder It is stored as one piece of offset data unique to the feeder.
[0008]
The tape feeder according to claim 3 is the tape feeder according to claim 1, wherein the stop position data is obtained for each pin based on a pin position measured for each pin of the sprocket. Is stored as offset data unique to the.
[0009]
According to a fourth aspect of the present invention, there is provided a tape feeding method in which a sprocket that meshes a tape holding an electronic component with a hole provided in the tape at a constant pitch is rotationally driven by a motor whose rotation amount can be controlled to feed the pitch. A tape feeding method using a tape feeder for supplying a component to a pickup position of an electronic component mounting apparatus, the step of measuring the position of each pin of the sprocket to obtain a displacement amount from a normal position, and an electronic device at the pickup position. a step of obtaining part based on said pin position measurement result of the data amount of rotation of the motor corresponding to the sprocket rotation stop position in a state of being located as a stop position data, the said stop position data obtained tape a step of storing a specific offset data of the feeder, the tape feeder Health By controlling the motor based on Oite the stopping position data, it stops the sprocket rotation stop position and the step of positioning the electronic component to the pickup position, in the step of storing the stop position data, the electronic The positional deviation amount of the pin is stored as offset data in the storage unit of the component mounting apparatus, and the positional deviation amount is converted into a pulse amount indicating the rotation amount of the motor via the communication unit of the tape feeder. Write to the data storage section of the tape feeder .
[0010]
The tape feeding method according to claim 5 is the tape feeding method according to claim 4, wherein the stop position data is obtained by statistically processing pin positions measured for all pins of the sprocket. One piece of offset data unique to the tape feeder, and common stop position data is used in all rotation stop positions in the step of positioning the electronic component.
[0011]
The tape feeding method according to claim 6 is the tape feeding method according to claim 4, wherein the stop position data is obtained for each pin based on a pin position measured for each pin of the sprocket. This is offset data unique to the pin, and the stop position data unique to each pin is used in the step of positioning the electronic component.
[0012]
According to the present invention, based on the measurement result of the pin position of the sprocket, the rotation amount data of the motor corresponding to the correct rotation stop position of the sprocket is obtained and stored as stop position data, and the motor is stopped when the tape feeder is in operation. By controlling the motor based on the position data, the sprocket can always be stopped at the correct rotation stop position, and the electronic component can be positioned at the pickup position.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of an electronic component mounting apparatus in which a tape feeder according to an embodiment of the present invention is disposed, FIG. 2 is a side view of the tape feeder according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a partial side view of the tape feeder according to one embodiment of the present invention, and FIG. 5 is a partial plan view of the tape feeder according to one embodiment of the present invention. 6 is a diagram showing stop position data of the tape feeder according to one embodiment of the present invention, and FIG. 7 is an explanatory diagram of the adsorbing position alignment of the tape feeder according to one embodiment of the present invention.
[0014]
First, the structure of the electronic component mounting apparatus will be described with reference to FIG. In FIG. 1, an electronic component mounting apparatus 1 includes a component supply unit 2 that supplies electronic components, and a plurality of tape feeders 4 are mounted on the upper surface of a feeder base 3 provided in the component supply unit 2. . The tape feeder 4 pulls out a carrier tape 7 (tape) holding electronic components from a supply reel 6 set on a carriage 5 positioned below the feeder base 3 and picks up the held electronic components by a transfer head 8. Supply to position.
[0015]
The transfer head 8 is driven by the head drive unit 11 and mounts the electronic component picked up from the tape feeder 4 on the substrate 10 positioned on the transport path 9. The head drive unit 11 is controlled by the control unit 14, and various data necessary for the mounting operation by the transfer head 8 and the tape feeding operation by the tape feeder 4 are stored in the storage unit 15.
[0016]
These data include tape data 15a, stop position data 15b, suction position data 15c, and mounting position data 15d described below (see FIG. 3). The tape data 15 a is data such as a tape feed pitch, a feed speed, and an acceleration / deceleration pattern in pitch feed when the carrier tape 7 is pitch-fed by the tape feeder 4, and is preset for each type of carrier tape 7.
[0017]
The stop position data 15b is correction data for preventing the pitch feed stop position from fluctuating due to an instrumental error unique to each tape feeder. By performing this correction, the electronic parts held on the carrier tape 7 are correctly corrected. It can be positioned at the pickup position. Here, as will be described later, the variation in the tape feed direction of the pin position of the tape feed sprocket is targeted for correction.
[0018]
The suction position data 15c is data indicating a suction position when the transfer head 8 picks up and picks up an electronic component from the pickup position of the tape feeder 4. By creating the suction position data for each tape feeder in advance, It is possible to correct a unique instrumental difference for each tape feeder. Here, the variation in the direction perpendicular to the tape feeding direction among the variation in the pin position of the sprocket is corrected by the suction position of the transfer head 8. The mounting position data 15d is data about the mounting position coordinates of the electronic component on the board 10.
[0019]
A camera 12 is disposed above the pickup position of the tape feeder 4. The camera 12 takes an image of the vicinity of the pickup position, and recognizes this imaged data by the recognition unit 13, thereby recognizing the position of a feed hole of a carrier tape 7 to be described later, the pin position of a sprocket for tape feed, and the like. A positional deviation amount with respect to the normal position is detected. The position detection result is sent to the control unit 14, and the control unit 14 calculates stop position data and suction position data based on the positional deviation amount of each pin as will be described later.
[0020]
Next, the tape feeder 4 will be described with reference to FIGS. 2, 3, and 4. In FIG. 2, the tape feeder 4 is mounted with the bottom surface of the elongated body portion 4 a placed along the top surface of the feeder base 3, and the locking portion 4 b provided on the bottom surface of the body portion 4 a is attached to the end of the feeder base 3. The position is fixed by locking. And in this state, the feeder control part 24 incorporated in the main-body part 4a is connected with the control part 14 of the electronic component mounting apparatus 1 via the connector 28 provided in the latching | locking part 4b. . Of various data stored in the storage unit 15, data necessary for operation control of the tape feeder 4 such as tape data 15 a and stop position data 15 b is transmitted to the feeder control unit 24 via the control unit 14.
[0021]
A sprocket 21 is disposed at the front end of the tape feeder 4 (on the right side in FIG. 2). On the outer periphery of the sprocket 21, pins 21 a that mesh with tape feed holes 7 b (see FIG. 7) provided on the carrier tape 7 at a constant pitch are provided at a constant pitch. A tooth surface 21b that meshes with the bevel gear 23 coupled to the output shaft of the motor 22 is provided (see FIG. 4).
[0022]
When the motor 22 is driven to rotate, the sprocket 21 rotates, whereby the carrier tape 7 is fed by tape. By this tape feeding, the carrier tape 7 is pulled out from the supply reel 6. The drawn out carrier tape 7 is guided from the rear end portion into the tape feeder 4 and fed forward along the tape feeding path.
[0023]
Here, the motor 22 is a type of motor that can control the number of rotations and the amount of rotation, such as a servo motor, and the feed when the carrier tape is pitch-fed by controlling the number of rotations and the amount of rotation of the motor 22. The speed, feed pitch, stop position in pitch feed, etc. can be set arbitrarily. Further, the motor 22 includes an encoder capable of detecting an absolute position so that the rotational position of each pin 21a of the sprocket 21 can be detected individually.
[0024]
The leading end of the tape feeder 4 is a position for picking up electronic components by the transfer head 8, and the fed carrier tape 7 is pitch-fed under a pressing member 29 provided on the top surface of the leading end. In the middle of this pitch feed, the electronic component 16 held in the recess 7a of the carrier tape 7 is picked up by the transfer head 8 through a notch 29a (see FIG. 5) provided in the pressing member 29. . Prior to picking up the electronic component 16, a top tape (not shown) is peeled off from the upper surface of the carrier tape 7, folded back, and stored in a tape storage container built in the main body 4a.
[0025]
Next, the configuration of the control system of the tape feeder 4 will be described with reference to FIG. The tape feeder 4 has a built-in feeder control unit 24, and the feeder control unit 24 includes a motor control unit 25, a communication unit 27, and a data storage unit 26. The motor control unit 25 controls the motor 22 for driving the sprocket 21. The communication unit 27 receives a control signal from the control unit 14 of the electronic component mounting apparatus 1, which is an external device, and transmits control parameters such as the rotation speed and rotation amount of the motor 22 to the motor control unit 25. Thereby, according to the instruction | command from the control part 14, according to the kind of carrier tape 7 to be used, the tape feed speed, feed pitch, etc. of the tape feeder 4 can be changed at any time.
[0026]
The communication unit 27 performs processing for writing data such as the tape data 15 a and the stop position data 15 b sent from the control unit 14 in the data storage unit 26. In the control parameter command to the motor control unit 25, for the carrier tape in which the tape data 15a is stored in the data storage unit 26, the tape feed speed and feed pitch can be changed simply by commanding the tape type. .
[0027]
The stop position data 15b will be described. In order to supply the electronic component held on the carrier tape 7 to the correct position, the pin 21 a needs to stop at the correct position during the intermittent rotation of the sprocket 21. However, in the sprocket 21, there is a variation in the position of each pin 21a due to manufacturing errors. For this reason, in order to stop the pin 21a at the correct position, it is necessary to correct this variation. In the present embodiment, the position of each pin 21a of the sprocket 21 is recognized by the camera 12, whereby the amount of displacement is obtained and necessary correction is performed.
[0028]
The positional deviation measurement of the pin 21a will be described. FIG. 5A shows the upper surface of the pressing member 29 disposed above the sprocket 21. By imaging the notch 29a in a state where the carrier tape 7 is not set, the pin 21a located near the top of the sprocket 21 is imaged, and the position of the pin 21a is measured.
[0029]
By this measurement, as shown in FIG. 5B, pin offset data Δx and Δy indicating the positional deviation in the X direction and Y direction from the normal position of the pin 21a are obtained. Then, by sequentially measuring the positional deviation of each pin 21a while intermittently rotating the sprocket 21 at a predetermined pitch, offset data indicating the positional deviation from the normal position is obtained for each pin.
[0030]
Thereby, the position of the pin 21a in a state where the electronic component is located at the correct pickup position, that is, the rotation stop position where the sprocket 21 should be stopped in the intermittent rotation for tape feeding is obtained. Then, rotation amount data of the motor 22 corresponding to each rotation stop position is obtained as stop position data, and the obtained stop position data is stored as unique offset data of the tape feeder 4. And in the operation state of the tape feeder 4, by controlling the motor 22 based on this offset data and stopping rotation, the pin 21a always stops at the correct stop position.
[0031]
These data creation processing calculations are performed by the control unit 14 of the electronic component mounting apparatus 1. Therefore, the control unit 14 is a stop position data calculation unit. The calculation result is stored in the storage unit 15 of the electronic component mounting apparatus 1 as offset data indicating the amount of misalignment, and the amount of misalignment is converted into a pulse amount indicating the amount of rotation of the motor 22 in the form of offset data. The data is sent to each tape feeder 4 and written to the data storage unit 26 of the tape feeder 4 via the communication unit 27. Accordingly, the storage unit 15 of the electronic component mounting apparatus 1 and the data storage unit 26 of each tape feeder 4 are stop position data storage units.
[0032]
Next, modes of the stop position data and the suction position data will be described with reference to FIG. Here, the offset data in the Y direction corresponds to the stop position data, and the offset in the X direction corresponds to the suction position data. FIG. 6 (a) is a statistical process of the pin positions measured for all the pins 21a of the sprocket 21 of the tape feeder that is the object of data creation, and the average position of the pin positions is obtained. That is, the average values ΣΔx / n and ΣΔy / n of the offset data Δx and Δy for each pin are obtained, and these average values are set as one offset data unique to the tape feeder. In this way, the data processing can be easily performed by statistically processing the pin position to obtain one offset data unique to the tape feeder.
[0033]
FIG. 6B shows an example in which offset data is stored for each pin 21 a of the sprocket 21. That is, in this example, the measured offset data Δx and Δy are stored in the storage unit 15 as they are as offset data (stop position data 15b) unique to the pin 21a. In this case, since stop position data that directly reflects the positional deviation state of each pin 21a is created, even if there is a large variation in pin position due to manufacturing errors of the sprocket 21, these The carrier tape 7 can always be stopped at an accurate position by correcting the variation.
[0034]
Although the example using the positional deviation amount of the pin 21a is shown here as the stop position data 15b, the notch 29a is imaged in the same manner as described above with the carrier tape 7 set, and the position of the recess 7a or the recess You may make it obtain | require stop position data by measuring the position of the electronic component itself in 7a. In this case, the positional deviation amount of the electronic component from the normal suction position is obtained as offset data Δx and Δy.
[0035]
FIG. 7 shows a method of correcting the stop position of the carrier tape 7 based on such stop position data and suction position data in the operating state of the tape feeder 4. When the pin 21a of the sprocket 21 is stopped at a predetermined position during pitch feeding, the motor 22 is controlled based on the aforementioned stop position data to perform positioning. That is, when the rotation of the motor 22 is stopped, the motor 22 is stopped at the rotation stop position corresponding to the position corrected by the offset data Δy in the Y direction from the normal position on the data (indicated by a broken line in the figure).
[0036]
And when picking up the electronic component in the recessed part 7a by the transfer head 8, the suction operation by the transfer head 8 is performed based on the suction position data. That is, when the transfer head 8 is aligned, the transfer head 8 is lowered after correcting the offset data Δx in the X direction from the normal suction position on the data.
[0037]
As a result, it is possible to effectively correct the displacement of the suction position caused by the variation in the pin position of the sprocket 21 and to position the electronic component at the correct pickup position, thereby reducing the suction mistake caused by the transfer head 8. In addition, it is not necessary to perform the position adjusting operation for each tape feeder which has been conventionally performed, and the labor for positioning the tape feeder can be reduced to improve the working efficiency.
[0038]
【The invention's effect】
According to the present invention, based on the measurement result of the pin position of the sprocket, the rotation amount data of the motor corresponding to the correct rotation stop position of the sprocket is obtained and stored as stop position data, and the motor is stopped when the tape feeder is in operation. By controlling the motor based on the position data, the sprocket can always be stopped at the correct rotation stop position to position the electronic component at the pickup position, and the work efficiency of the tape feeder can be reduced. Can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electronic component mounting apparatus in which a tape feeder according to an embodiment of the present invention is disposed. FIG. 2 is a side view of the tape feeder according to an embodiment of the present invention. FIG. 4 is a partial side view of the tape feeder according to the embodiment of the present invention. FIG. 5 is a partial plan view of the tape feeder according to the embodiment of the present invention. FIG. 6 is a diagram showing stop position data of the tape feeder according to the embodiment of the present invention. FIG. 7 is an explanatory diagram of the adsorption position alignment of the tape feeder according to the embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Electronic component mounting apparatus 2 Component supply part 4 Tape feeder 7 Carrier tape 7b Feed hole 8 Transfer head 10 Board | substrate 11 Head drive part 12 Camera 13 Recognition part 14 Control part 15 Memory | storage part 15a Tape data 15b Stop position data 21 Sprocket 21a Pin 24 Feeder control unit 25 Motor control unit 26 Data storage unit 27 Communication unit

Claims (6)

A tape feeder that feeds an electronic component to a pickup position of an electronic component mounting apparatus by pitch-feeding a tape holding an electronic component, the sprocket being engaged with a feed hole provided at a constant pitch in the tape and feeding the tape; A sprocket drive mechanism for rotating the sprocket with a motor whose rotation amount can be controlled as a drive source, a motor control unit for controlling the motor, and a sprocket rotation stop position in a state where the electronic component is located at the pickup position. A stop position data storage unit that stores the stop position data obtained as the corresponding rotation amount data of the motor as offset data unique to the tape feeder;
The rotation stop position is obtained by measuring the amount of positional deviation from the normal position of each pin position of the sprocket, and the stop position data is stored as offset data in the storage unit of the electronic component mounting apparatus. The tape feeder is written in the stop position data storage unit via the communication unit of the tape feeder in the form of offset data in which the positional deviation amount is converted into a pulse amount indicating the rotation amount of the motor . 2. The stop position data is obtained by statistically processing pin positions measured for all pins of the sprocket, and stored as one offset data unique to the tape feeder. The tape feeder described. 2. The tape according to claim 1, wherein the stop position data is obtained for each pin based on a pin position measured for each pin of the sprocket, and stored as offset data unique to the pin. feeder. A sprocket that meshes a tape holding an electronic component with a hole provided in the tape at a constant pitch is rotationally driven by a motor whose rotation amount can be controlled to feed the electronic component to the pickup position of the electronic component mounting apparatus. a tape feed method according to the tape feeder supplies, and obtaining a positional shift amount from the normal position by measuring the position of each pin of the sprocket, rotating the sprocket in a state in which the electronic component is positioned at the pickup position A step of obtaining rotation amount data of the motor corresponding to the stop position as stop position data based on the position measurement result of the pin, and a step of storing the obtained stop position data as inherent offset data of the tape feeder And based on the stop position data in the operating state of the tape feeder. By controlling the motor Te, and a step of positioning the electronic component to the pickup position to stop the sprocket rotation stop position,
In the step of storing the stop position data, an offset obtained by storing the positional deviation amount of the pin as offset data in the storage unit of the electronic component mounting apparatus and converting the positional deviation amount into a pulse amount indicating the rotation amount of the motor. A tape feeding method using a tape feeder, wherein data is written in a data storage unit of the tape feeder via a communication unit of the tape feeder in the form of data . The stop position data is one piece of offset data unique to the tape feeder obtained by statistically processing the pin positions measured for all the pins of the sprocket, and is all in the step of positioning the electronic component. 5. The tape feeding method according to claim 4, wherein common stop position data is used at the rotation stop positions. The stop position data is offset data specific to each pin obtained for each pin based on the pin position measured for each pin of the sprocket, and in the step of positioning the electronic component, for each pin 5. The tape feeding method according to claim 4, wherein the stop position data unique to the tape is used.

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