Component mounting device and component mounting method

Abstract

To provide a parts mounting device / method that improves production efficiency. [Solution] The component mounting device comprises a tape feeder that transports a current tape containing components in pockets from the tape entrance to a component suction position, a mounting head that picks up components stored in the pockets of the current tape at the component suction position and mounts them to a substrate, a suction detection unit that detects component suction by the mounting head, an operation unit that accepts the operator's selection of a first mode or a second mode when the suction detection unit detects a suction error, and a control unit. When the first mode is selected, the control unit transports the current tape for a first length and decides whether or not to proceed to the loading operation of the next tape to be transported after the current tape, and when the second mode is selected, it transports the current tape for a second length shorter than the first length and then resumes component suction.

Description

Technical Field

[0001] The present disclosure relates to a component mounting device including a tape feeder and a component mounting method.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1, a component mounting device and a component mounting method using a tape feeder are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When there are no components stored in the current tape, the tape feeder switches to the next tape. For example, when multiple component suction failures occur by the mounting head and the end of the current tape passes a predetermined position, the component mounting device including the tape feeder may determine that there are no components stored in the current tape and perform a switching operation to the next tape.

[0005] However, there are cases where the component mounting device alone cannot appropriately determine whether to perform the switching operation to the next tape. For example, when the distance from the position where the last component of the current tape is stored to the end is long and the end has not yet passed a predetermined location, the component mounting device may not be able to shift to the switching operation to the next tape even though there are no components stored in the current tape. Also, the operation of switching to the next tape by the operator may sometimes be time-consuming. Therefore, there is room for improvement from the perspective of improving production efficiency.

[0006] This disclosure provides a component mounting device and a component mounting method that improve production efficiency. [Means for solving the problem]

[0007] A component mounting device according to one aspect of the present disclosure includes a tape feeder that transports a current tape containing components in pockets from the tape entrance to a component suction position; a mounting head that, at the component suction position, picks up the components stored in the pockets of the current tape and mounts them on a substrate; a suction detection unit that detects the suction of the components by the mounting head; an operation unit that, when the suction detection unit detects a suction error, allows the operator to select a first mode or a second mode; and a control unit. The control unit controls the tape feeder to transport the current tape for a first length when the first mode is selected by the operation unit, and determines whether or not to proceed to the loading operation of the next tape to be transported after the current tape; and controls the tape feeder to transport the current tape for a second length shorter than the first length when the second mode is selected, and then controls the mounting head to resume the suction of the components.

[0008] Furthermore, the component mounting method of the present disclosure is a component mounting method comprising supplying a component to a component suction position by a tape feeder and mounting the component to a substrate by a mounting head, and includes the steps of: detecting a suction error by a suction detection unit; if a suction error is detected in the step of detecting the suction error, allowing the operator to select either a first mode or a second mode by an operation unit; if the first mode is selected, controlling the tape feeder by a control unit to transport the current tape for a first length and deciding whether or not to proceed to the loading operation of the next tape to be transported after the current tape; and if the second mode is selected, controlling the tape feeder by the control unit to transport the current tape for a second length shorter than the first length, and then controlling the mounting head to resume suction of the component. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a component mounting device and a component mounting method that improve production efficiency. [Brief explanation of the drawing]

[0010] [Figure 1] Schematic diagram of a component mounting system equipped with a component mounting device according to the embodiment of this disclosure. [Figure 2] Plan view showing multiple tape feeders mounted on the feeder base of a trolley. [Figure 3] Schematic perspective view of the carrier tape [Figure 4A] A schematic perspective view showing the missing part near the end of the carrier tape. [Figure 4B] Schematic perspective view showing a carrier tape with some parts missing. [Figure 5] Schematic elevation view of a tape feeder according to the embodiment of the present disclosure [Figure 6] Block diagram showing the control system of the component mounting device according to the embodiment of this disclosure. [Figure 7A] A schematic elevation view showing the state in which the carrier tape is inserted into the tape feeder. [Figure 7B] Schematic elevation view showing the transport of current tape by a tape feeder. [Figure 8A] Schematic elevation view showing the transport of current tape by a tape feeder. [Figure 8B] A schematic elevation view showing the switching of the transport path for the current tape within the tape feeder. [Figure 9A] A schematic elevation view showing the next tape being inserted into the tape feeder. [Figure 9B] Schematic elevation drawing showing the switch from current tape to next tape. [Figure 10A] Flowchart of the Embodiment Related to This Disclosure [Figure 10B] Flowchart showing the first mode [Figure 10C]Flowchart showing the second mode [Figure 11A] Popup for accepting selection of the first mode or the second mode [Figure 11B] Variant of the popup for accepting selection of the first mode or the second mode [Figure 11C] Variant of the popup for accepting selection of the first mode or the second mode [Figure 11D] Popup for confirming whether to transition to the loading of the next tape in the second mode [Figure 11E] Popup for confirming whether the next tape has been set in the second mode [Figure 12] Popup prompting the operator to perform work

Mode for Carrying Out the Invention

[0011] According to the first aspect of the present disclosure, there is provided a component mounting apparatus including: a tape feeder configured to convey a current tape storing components in pockets from a tape inlet to a component adsorption position; a mounting head configured to adsorb a component stored in the pocket of the current tape at the component adsorption position and mount the component on a substrate; an adsorption detection unit configured to detect adsorption of the component by the mounting head; an operation unit configured to accept a selection of a first mode or a second mode from an operator when the adsorption detection unit detects an adsorption error; and a control unit. The control unit controls the tape feeder to convey the current tape for a first length when the first mode is selected in the operation unit, determines whether to transition to an operation of loading a next tape to be conveyed next of the current tape, controls the tape feeder to convey the current tape for a second length shorter than the first length when the second mode is selected, and then controls the mounting head to resume adsorption of the component.

[0012] A second aspect of this disclosure provides a component mounting device according to the first aspect, comprising a current tape detection unit for detecting the presence or absence of the current tape, wherein in the first mode, the control unit controls the tape feeder to transition to the next tape loading operation in response to the current tape detection unit no longer detecting the current tape.

[0013] According to a third aspect of the present disclosure, the component mounting device according to the second aspect is provided, wherein in the first mode, when the current tape of the first length is transported, the control unit, in response to detecting the current tape, allows the operator to choose whether or not to continue the first mode at the operation unit.

[0014] According to a fourth aspect of the present disclosure, the component mounting device according to any one of the first to third aspects is provided, wherein in the second mode, after restarting the suction of the component by the mounting head, the control unit, in response to detecting a suction error by the suction detection unit, accepts from the operator at the operation unit whether or not to continue the second mode.

[0015] A fifth aspect of this disclosure provides a component mounting device according to the first to fourth aspects, further comprising a next tape detection unit for detecting the presence or absence of the next tape, wherein in the second mode, when the current tape detection unit stops detecting the current tape, the tape feeder is controlled to transition to the next tape loading operation or the operator is prompted to set the next tape, depending on whether the next tape detection unit has detected the next tape.

[0016] According to a sixth aspect of this disclosure, a component mounting device according to any one of the first to fifth aspects is provided, wherein the first length is longer than the horizontal distance from the component suction position to the current tape detection unit.

[0017] According to a seventh aspect of this disclosure, a component mounting device according to the first to sixth aspects is provided, wherein the first length is shorter than twice the horizontal distance from the component suction position to the current tape detection unit.

[0018] According to the eighth aspect of this disclosure, a component mounting device according to the first to seventh aspects is provided, wherein the second length is one or more times the distance between adjacent pockets of the current tape.

[0019] According to the ninth aspect of this disclosure, a component mounting device according to the first to eighth aspects is provided, wherein the second length is 10 times or less the distance between adjacent pockets of the current tape.

[0020] According to a tenth aspect of the present disclosure, the component mounting device described in the first to ninth aspects is provided, wherein the operation unit has a display screen, and the control unit displays content related to the first mode and the second mode on the display screen and accepts the operator's selection of the first mode or the second mode.

[0021] According to an eleventh aspect of this disclosure, the component mounting apparatus according to the tenth aspect is provided, wherein the control unit causes the display screen to display content prompting the cutting of the current tape in connection with the execution of the first mode.

[0022] A twelfth aspect of the present disclosure provides a component mounting method comprising: supplying a component to a component suction position using a tape feeder, and mounting the component to a substrate using a mounting head, the method comprising: detecting a suction error using a suction detection unit;, in the step of detecting the suction error, if a suction error is detected, allowing an operator to select either a first mode or a second mode using an operation unit;, if the first mode is selected, controlling the tape feeder using a control unit to transport the current tape for a first length and deciding whether or not to proceed with the loading operation of the next tape to be transported after the current tape; and, if the second mode is selected, controlling the tape feeder using the control unit to transport the current tape for a second length shorter than the first length, and then controlling the mounting head to resume suction of the component.

[0023] The embodiments of this disclosure will be described below with reference to the attached drawings. In addition, each element is shown schematically in each drawing for the sake of clarity.

[0024] (Embodiment) A component mounting device and a component mounting method according to the embodiments of this disclosure will be described.

[0025] [Overall structure] Figure 1 is a schematic diagram showing an example of a component mounting system 100 and a component mounting device 1 according to an embodiment of the present disclosure. The component mounting system 100 comprises a component mounting device 1, a management device 92, and a portable information terminal 95. In Figure 1, the vertical direction of the paper is the X direction, the left-right direction is the Y direction, and the up-down direction is the Z direction.

[0026] [Component mounting device] The component mounting device 1 receives the substrate 4 from the upstream process equipment, mounts the components 5 onto the substrate 4, and then transports the substrate 4 with the components 5 mounted to the downstream process equipment. The component mounting device 1 comprises a component supply unit 3 and a main unit 2.

[0027] [Parts Supply Department] The parts supply unit 3 supplies parts 5 stored on the carrier tape 24 to the main unit 2. As shown in Figure 1, the parts supply unit 3 includes a trolley 21 and a tape feeder 23.

[0028] The trolley 21 transports and positions the tape feeder 23 and the reel 22, which winds and stores the carrier tape 24, relative to the main body 2. The trolley 21 has a feeder base 31 and a reel holding section 32.

[0029] The feeder base 31 is a component for holding the tape feeder 23. The feeder base 31 has grooves called mounting slots (not shown), into which the tape feeder 23 fits. As shown in Figure 2, the feeder base 31 may hold multiple tape feeders 23.

[0030] Returning to Figure 1, the reel holding section 32 is a component that holds the reel 22 on which the carrier tape 24 is wound and stored.

[0031] As shown in Figure 3, the carrier tape 24 is a component that houses the parts 5. The carrier tape 24 comprises a base tape 51 and a top tape 52.

[0032] The base tape 51 is a component that serves as the base for the carrier tape 24. The base tape 51 includes a pocket 53 and a feed hole 54. The pocket 53 has an opening on its upper surface, allowing it to accommodate the component 5. The feed hole 54 is a hole that engages with a sprocket of the tape feeder 23, which will be described later. With the feed hole 54 and the sprocket engaged, the sprocket rotates, allowing the carrier tape 24 to be transported.

[0033] The top tape 52 is a component that is attached to the base tape 51 in order to enclose the component 5 inside the pocket 53.

[0034] The carrier tape 24 may have missing parts where component 5 is not contained. Examples of missing parts are shown in Figures 4A and 4B.

[0035] In the example shown in Figure 4A, the carrier tape 24 has a component-missing section B1, which extends from the pocket 53a that houses the last component to the end of the tape 55. The length of the component-missing section B1 varies depending on the type and individual differences of the carrier tape 24 and / or reel 22.

[0036] In the example shown in Figure 4B, the carrier tape 24 has a missing component portion B2, which extends to at least one pocket 53 before the tape end 55 of the carrier tape 24. Figure 4B illustrates a case where the missing component portion B2 extends continuously across three pockets 53. The missing component portion B2 occurs, for example, when some kind of defect occurs during the production or distribution process of the carrier tape 24.

[0037] Returning to Figure 1, the reel 22 is classified into reel 22a and reel 22b. Reel 22a stores the current tape 24a, which is the carrier tape 24 currently being transported by the tape feeder 23. Reel 22b stores the next tape 24b, which is the carrier tape 24 that the tape feeder 23 will transport after the current tape 24a.

[0038] The reel holding unit 32 is equipped with reels 22a and reels 22b corresponding to one tape feeder 23. As shown in Figure 2, when the feeder base 31 holds multiple tape feeders 23, the reel holding unit 32 holds a number of reels 22a and reels 22b corresponding to the number of tape feeders 23.

[0039] Returning to Figure 1, a barcode 28 containing part information for the part 5 packaged on the carrier tape 24 is attached to the reel 22. The barcode 28 is a type of identifier that encodes information including part information, but it is not limited to a one-dimensional code; it may also be a two-dimensional code or other type of identifier.

[0040] The tape feeder 23 is a device that transports the carrier tape 24 and supplies the components 5 to the main unit 2. Figure 5 shows a schematic elevation view of the tape feeder 23. The tape feeder 23 includes a tape inlet 23a, a tape transport path 60, a tape introduction section 62, a shutter unit 63, an exposure section 66, a tape transport section 61, a component supply port 23b, an outlet port 23c, a next tape detection section PH1, a first current tape detection section PH2, a second current tape detection section PH3, a third current tape detection section PH4, a unit-side connector 65, and a unit control section 64.

[0041] The tape inlet 23a is a hole for inserting the carrier tape 24 into the tape feeder 23.

[0042] The tape transport path 60 is a transport path for guiding the carrier tape 24 that is fed in from the tape inlet 23a. The tape transport path 60 expands in the upstream direction. The bottom surface 60a of the tape transport path 60 is the surface on which the carrier tape 24 slides.

[0043] The tape introduction unit 62 introduces the carrier tape 24, which has been inserted through the tape inlet 23a, into the tape feeder 23. The tape introduction unit 62 comprises a transport sprocket 62a, a tape support unit 62b, and a drive unit 62c.

[0044] The feed sprocket 62a can introduce the carrier tape 24 into the tape feeder 23 by engaging the teeth of the feed sprocket 62a with the feed holes 54 of the carrier tape 24 and rotating in the direction indicated by arrow a1.

[0045] The tape support section 62b is a component for guiding the carrier tape 24 at the tape entrance 23a. The tape support section 62b is also movable in the direction indicated by arrow a2 together with the loading sprocket 62a. This allows the tape support section 62b to move the carrier tape 24 to the bottom surface 60a and guide a new carrier tape 24.

[0046] The drive unit 62c is a component for driving the loading sprocket 62a and the tape support unit 62b. The drive unit 62c comprises a power source such as a motor, a power transmission member such as a gear, and a power transmission mechanism such as a link mechanism.

[0047] The shutter unit 63 is a unit that prevents the carrier tape 24, guided by the tape support section 62b, from entering the downstream area. Furthermore, under certain conditions, the shutter unit 63 opens, allowing the carrier tape 24 to be transported downstream.

[0048] The exposed portion 66 is a component for separating the top tape 52 of the carrier tape 24 from the base tape 51. In this embodiment, the exposed portion 66 is provided by a combination of air and rollers.

[0049] The tape transport unit 61 transports the carrier tape 24 to the component supply port 23b. The tape transport unit 61 comprises a first transport sprocket 61a, a second transport sprocket 61b, a third transport sprocket 61c, and a drive unit 61d.

[0050] The first transport sprocket 61a, the second transport sprocket 61b, and the third transport sprocket 61c are arranged along the tape transport path 60. The first transport sprocket 61a, the second transport sprocket 61b, and the third transport sprocket 61c can transport the carrier tape 24 by rotating with their teeth engaged with the feed holes 54 in the carrier tape 24. The first transport sprocket 61a is used for discharging the carrier tape 24, the second transport sprocket 61b is used for adjusting the position of the part 5, and the third transport sprocket 61c is used for transporting the carrier tape 24.

[0051] The drive unit 61d is a component for driving the first transport sprocket 61a, the second transport sprocket 61b, and the third transport sprocket 61c. The drive unit 61d comprises a power source such as a motor and a power transmission component such as a gear.

[0052] The discharge port 23c is a hole for discharging the carrier tape 24, which has finished supplying parts 5 to the main body 2, to the outside of the tape feeder 23. The discharge port 23c is in communication with the tape transport path 60.

[0053] The next tape detection unit PH1 is a sensor for detecting the carrier tape 24 that has been inserted from the tape inlet 23a and introduced by the tape introduction unit 62. The next tape detection unit PH1 is located downstream D1 from the tape introduction unit 62 and in the vicinity of the tape introduction unit 62.

[0054] The first current tape detection unit PH2 is a sensor for detecting the presence or absence of a current tape 24a in the tape transport path 60. In this embodiment, the first current tape detection unit PH2 can detect the end of the current tape 24a by ceasing to detect the current tape 24a. The current tape PH2 is located downstream D1 from the next tape detection unit PH1.

[0055] The second current tape detection unit PH3 and the third current tape detection unit PH4 are sensors that detect the presence or absence of the current tape 24a. The second current tape detection unit PH3 is located upstream of the tape transport unit 61, and the third current tape detection unit PH4 is located downstream D1 of the tape transport unit 61.

[0056] The next tape detection unit PH1, the first current tape detection unit PH2, the second current tape detection unit PH3, and the third current tape detection unit PH4 may be composed of optical sensors such as reflective or transmissive photosensors.

[0057] The unit-side connector 65 is configured to enable communication between the tape feeder 23 and the main unit 2. The unit-side connector 65 is connected to the main unit 2 via a connector on the feeder base 31, enabling communication between them.

[0058] Next, the configuration of the control system for the tape feeder 23 will be described with reference to Figure 6. The unit control unit 64 is electrically connected to the next tape detection unit PH1, the first current tape detection unit PH2, the second current tape detection unit PH3, the third current tape detection unit PH4, the drive unit 61d, and the drive unit 62c. The unit control unit 64 controls the operation of the drive unit 61d and the drive unit 62c. The unit control unit 64 can also receive signals transmitted from the next tape detection unit PH1, the first current tape detection unit PH2, the second current tape detection unit PH3, and the third current tape detection unit PH4.

[0059] Furthermore, the unit control unit 64 is connected to the main unit 2 via the unit-side connector 65. This allows the unit control unit 64 to communicate with the main unit 2 and control the tape feeder 23 in conjunction with the main unit 2.

[0060] The unit control unit 64 can be composed of circuits such as a microcontroller, CPU, MPU, GPU, DSP, FPGA, or ASIC. The functions of the unit control unit 64 may be implemented using hardware alone, or they may be realized by a combination of hardware and software.

[0061] [Main body] As shown in Figure 1, the main body 2 comprises a base 11, a substrate transport unit 12, a mounting head 13, a head movement mechanism 14, an operation unit 16, a main body control unit 17, and a camera 19.

[0062] The base 11 is a platform for arranging the various components of the main body 2.

[0063] The substrate transport unit 12 positions the substrate 4, which has been transported by the upstream process equipment, in a predetermined position by transporting it in the X direction. The substrate transport unit 12 includes, for example, a conveyor mechanism.

[0064] The mounting head 13 picks up the component 5 and mounts it onto the substrate 4. The mounting head 13 has a nozzle 13a extending downward. The nozzle 13a is connected to a negative pressure source (not shown) by a tube 13b, which generates a vacuum suction force. The negative pressure source is, for example, a vacuum pump. The mounting head 13 also includes a suction detection unit 13c, which can detect the pressure value of the negative pressure at the nozzle 13a. The suction detection unit 13c is connected to a main unit control unit 17, which will be described later, and can transmit the pressure value to the main unit control unit 17. The suction detection unit 13c is, for example, a vacuum sensor.

[0065] The head movement mechanism 14 is to which the mounted head 13 is attached and moves the mounted head 13 in the X and Y directions. The head movement mechanism 14 is, for example, an XY table.

[0066] The operation unit 16 is located on the side of the main unit 2. The operation unit 16 has a display screen 16a, which displays the status of the component mounting device 1. The display screen 16a may be a touchscreen, or it may display operation buttons for operating the component mounting device 1.

[0067] Camera 19 photographs the nozzle 13a that picks up the component 5. Camera 19 is positioned between the component pick-up position 23ba and the substrate 4. Camera 19 is connected to the main unit control 17 and can transmit the captured image.

[0068] Next, with reference to Figure 6, the configuration of the control system of the main unit 2 will be explained. The main unit control unit 17 is connected to the substrate transport unit 12 and is capable of operating the substrate transport unit 12. The main unit control unit 17 is also connected to the mounting head 13 and is capable of controlling the operation of the mounting head 13. Furthermore, the main unit control unit 17 is connected to the suction detection unit 13c and is capable of detecting the suction status of the component 5 by the mounting head 13. In addition, the main unit control unit 17 is connected to the operation unit 16 and is capable of receiving operations from the operator and displaying information on the display screen 16a. Moreover, the main unit control unit 17 is connected to the camera 19 and is capable of receiving images and videos captured by the camera 19.

[0069] Furthermore, the main unit control unit 17 is connected to the component supply unit 3 through the main unit side connector 10. This allows the main unit control unit 17 to communicate with the component supply unit 3 and control the main unit 2 in conjunction with the component supply unit 3.

[0070] The main control unit 17 is composed of, for example, a microcontroller, CPU, MPU, GPU, DSP, FPGA, ASIC, or a combination thereof. The functions of the main control unit 17 may be composed solely of hardware, or they may be realized by a combination of hardware and software. The main control unit 17 may realize predetermined functions by reading data and programs stored in a storage unit such as memory and performing various arithmetic operations.

[0071] In this embodiment, the tape feeder 23 has a unit control unit 64 and the main body 2 has a main body control unit 17, but is not limited to this. For example, the component mounting device 1 may have a control unit 70 which is a combination of the unit control unit 64 and the main body control unit 17. Alternatively, the control unit 70 may be provided separately from the component mounting device 1.

[0072] [Management devices and portable information terminals] As shown in Figure 1, the management device 92 is connected to the component mounting device 1 in a communicative manner and manages the information of the component mounting device 1 collectively. The management device 92 is, for example, a host computer.

[0073] The portable information terminal 95 can communicate with the management device 92 to check the information held by the management device 92. The portable information terminal 95 is, for example, a tablet or a smartphone.

[0074] Furthermore, the portable information terminal 95 may also acquire information from the carrier tape 24. For example, the portable information terminal 95 may read the barcode 28 attached to the reel 22 on which the carrier tape 24 is wound and stored, and transmit the obtained information to the management device 92.

[0075] [Operation] Next, the operation of the component mounting device 1 in the embodiment of this disclosure will be described. First, the transport operation of the carrier tape 24 by the tape feeder 23 will be described with reference to Figures 7A to 9B.

[0076] As shown in Figure 7A, the operator inserts the carrier tape 24 into the tape inlet 23a along the tape support section 62b. The tape introduction section 62 transports the carrier tape 24 inserted by the operator into the transport path 60. When the next tape detection section PH1 detects the transported carrier tape 24, the tape introduction section 62 stops transporting the carrier tape 24.

[0077] As shown in Figure 9A, when the current tape 24a is in the transport path 60, the shutter unit 63 is closed, preventing the carrier tape 24 from moving downstream D1.

[0078] As shown in Figure 7A, if there is no current tape 24a in the transport path 60, the shutter unit 63 opens. The tape introduction unit 62 then further transports the carrier tape 24 downstream D1, bringing the carrier tape 24 to the third transport sprocket 61c of the tape transport unit 61, as shown in Figure 7B. The tape introduction unit 62 then stops.

[0079] The third transport sprocket 61c further transports the carrier tape 24 downstream in D1. As shown in Figure 8A, when the third current tape detection unit PH4 detects the carrier tape 24, the exposed unit 66 captures the top tape 52 of the carrier tape 24.

[0080] As the exposed portion 66 captures the top tape 52 and the transport portion 61 transports the carrier tape 24 downstream in D1, the top tape 52 is peeled off from the base tape 51. As a result, the component 5 is transported in an exposed state.

[0081] Next, a track change is performed at the tape introduction section 62. As shown in Figure 8B, the carrier tape 24 is moved from the tape support section 62b to the bottom surface 60a by the operation of the tape introduction section 62. At this point, the carrier tape 24 becomes the current tape 24a. As a result, the tape introduction section 62 becomes capable of receiving a new carrier tape 24, which is the next tape 24b.

[0082] As shown in Figure 9A, the operator inserts a new carrier tape 24 (next tape 24b) into the tape entry section 62. The procedure for inserting the next tape 24b is the same as the procedure for inserting the carrier tape 24 described above.

[0083] As shown in Figure 9B, once the current tape 24a is transported and the tape end 55 has passed, the first current tape detection unit PH2 ceases to detect the current tape 24a. As a result, the tape transport unit 61 discharges the current tape 24a.

[0084] Upon completion of the discharge of the current tape 24a by the tape transport unit 61, the loading of the next tape 24b begins. Specifically, upon release of the lock on the shutter unit 63, the tape introduction unit 62 loads the next tape 24b downstream in direction D1 to reach the third transport sprocket 61c. Subsequent operations are the same as those of the carrier tape 24 transport operation described above.

[0085] Next, an example of the operation of the component mounting device 1 when a suction error occurs will be explained following the flowchart shown in Figures 10A to 10C. Figures 11A to 11E and 12 show an example of a pop-up displayed on the display screen 16a during the operation of the component mounting device 1.

[0086] As shown in Figure 1, the operator prepares to mount the component 5 onto the substrate 4 by positioning the component supply unit 3 relative to the main unit 2. Then, by performing a predetermined operation, the component mounting device 1 begins the process of mounting the component 5 onto the substrate 4.

[0087] The component mounting device 1 operates the substrate transport unit 12 to transport the substrate 4, which has been transported from the upstream device, into the component mounting device 1. Meanwhile, the component supply unit 3 transports the carrier tape 24 to the component suction position 23ba, positioning the component 5 so that it can be picked up by the mounting head 13.

[0088] The control unit 70 starts picking up the component 5 using the mounting head 13. Specifically, the mounting head 13 picks up the component 5 using the nozzle 13a at the component pick-up position 23ba. The pick-up detection unit 13c detects that the component 5 has been picked up by the nozzle 13a. The control unit 70 then moves the mounting head 13 that has picked up the component 5 to mount the component 5 onto the substrate 4.

[0089] The control unit 70 executes the component mounting operation by repeatedly picking up the component 5 and mounting it onto the substrate 4 for each component, based on a predetermined mounting program.

[0090] During the component mounting operation, the control unit 70 determines whether an adsorption error has occurred (S1). Specifically, the adsorption detection unit 13c detects whether the nozzle 13a of the mounting head 13 has adsorbed the component 5 and transmits the detection result to the control unit 70. Based on the detection result transmitted from the adsorption detection unit 13c, the control unit 70 determines whether an adsorption error has occurred.

[0091] If it is determined that no suction error has occurred (No in S1), the control unit 70 controls the mounting head 13 to attach the component 5 to the substrate 4.

[0092] If it is determined that an adsorption error has occurred (Yes in S1), the control unit 70 determines whether the adsorption errors occurred consecutively (S2). Specifically, the control unit 70 determines whether the number of consecutive adsorption errors exceeds a specified number. The specified number is, for example, 3 times, but it may be set to any number.

[0093] If the number of consecutive suction errors is less than or equal to a specified number (No in S2), the control unit 70 controls the mounting head 13 to pick up the component 5 again.

[0094] If the number of consecutive suction errors exceeds a specified number (Yes in S2), the control unit 70 displays a pop-up (S3). Specifically, the control unit 70 displays a pop-up W10 on the display screen 16a, as shown in Figure 11A.

[0095] Pop-up W10 notifies the operator of a message and accepts multiple mode selections. Pop-up W10 has a message W12, a first mode selection button W14, a second mode selection button W16, and a pause selection button W18. Message W12 includes instructions for the operator and an explanation of the actions that will be taken when each selection button is pressed. This allows the operator to accurately select the first mode, the second mode, and the pause mode. By providing multiple modes, appropriate measures can be taken in the event of a suction error, and production efficiency can be improved.

[0096] The operator selects one of the following modes: Mode 1, Mode 2, or Interrupt Mode (S4). Mode 1 is for ejecting the current tape 24a and switching to the next tape 24b. Mode 2 is for resuming the suction of component 5 by the mounted head 13.

[0097] In the first mode, when the component missing section B1 is long, as shown in Figure 4A, the current tape 24a can be efficiently discharged and switched to the next tape 24b. If the current tape detection unit PH2 detects the current tape 24a, as shown in Figure 9A, even though the current tape 24a no longer contains the component 5, the control unit 70 does not switch to the next tape 24b. In the first mode, the control unit 70 can efficiently transport the current tape 24a, as shown in Figure 9B. When the tape end 55 has passed the current tape detection unit PH2, the control unit 70 can proceed to the operation of switching to the next tape 24b.

[0098] In the second mode, if a component missing section B2 occurs accidentally as shown in Figure 4B, the current tape 24a is transported only through the component missing section B2, and the mounting head 13 efficiently resumes picking up the component 5.

[0099] The operator can select between the first and second modes depending on the situation. This allows the operator to flexibly restart production.

[0100] Furthermore, if the operator presses the interruption selection button W18 (interruption in S4), the pop-up W10 is cleared (S5), and the component mounting device 1 stops.

[0101] When the operator presses the first mode selection button W14 (first mode in S4), the control unit 70 switches to the first mode.

[0102] Figure 10B shows the flowchart for the first mode. Display screen 16a displays a pop-up (S10). Specifically, the control unit 70 causes the display screen 16a to display a pop-up W60 as shown in Figure 12.

[0103] The pop-up W60 shown in Figure 12 prompts the operator to perform a task. The pop-up W60 includes a message W62, a message image W64, and a completion selection button W66.

[0104] Message W62 includes instructions prompting the operator to cut the current tape 24a and an explanation of the actions taken by pressing each selection button. By cutting the current tape 24a, the tape feeder 23 can more easily discharge the current tape 24a.

[0105] Furthermore, message image W64 illustrates the instructions given to the operator by message W62. For example, as shown in Figure 12, message image W64 illustrates to the operator that a specific portion of the current tape 24a should be cut. This allows the operator to carry out the instructions more accurately.

[0106] When the operator cuts the current tape 24a and presses the complete selection button W26, the control unit 70 transports the current tape 24a along the loop-shaped flow indicated by steps S11 to S13.

[0107] The control unit 70 determines whether to detect the current tape 24a (S11). Specifically, the first current tape detection unit PH2 transmits the detection result to the control unit 70. Based on the detection result of the first current tape detection unit PH2, the control unit 70 determines whether to detect the current tape 24a.

[0108] As shown in Figure 9B, if the current tape 24a is no longer detected (No in S11), the tape feeder 23 switches to the next tape 24b (S14). Specifically, in response to the first current tape detection unit PH2 no longer detecting the current tape 24a, the control unit 70, in accordance with the above-described operation, discharges the current tape 24a from the tape feeder 23 and loads the next tape 24b. If the next tape 24b is not set, the control unit 70 may display a pop-up as shown in Figure 11E to prompt the operator to set the next tape 24b.

[0109] As shown in Figure 9A, when the current tape 24a is detected (Yes in S11), the control unit 70 determines whether the tape feeder 23 has transported the current tape 24a for a first length (S12).

[0110] If the length of current tape 24a transported by tape feeder 23 does not reach the first length (No in S12), tape feeder 23 continues to transport current tape 24a (S13). Then, the process returns to step S11. That is, while transporting the current tape (S13) from the time the selection of the first mode is accepted until the length of current tape transported by tape feeder 23 reaches the first length, the current tape detection unit PH2 detects whether or not it has stopped detecting current tape 24a (S11).

[0111] If the operator confirms the pop-up W60 displayed in step S10 and properly cuts the current tape 24a, the current tape 24a will no longer be detected before reaching the first length (No in S11). This allows the system to proceed to the switching operation to the next tape 24b (S14).

[0112] On the other hand, if the operator has not properly cut the current tape 24a, and the tape end 55 does not pass the current tape detection unit PH2 even after the current tape 24a has been transported to the first length, the control unit 70 continues to detect the current tape 24a (Yes in S11) and determines that the first length has been reached (Yes in S12). In this case, the tape feeder 23 stops transporting the current tape 24a (S15). Then, the pop-up is displayed again (S4).

[0113] If the first length is reached despite the operator cutting the current tape 24a, a malfunction due to a failure of the first current tape detection unit PH2 is possible. In such cases, stopping the transport and displaying the pop-up again allows the operator to perform recovery actions. When displaying the pop-up again, it may be helpful to inform the operator that there may be an abnormality such as a failure of PH2.

[0114] On the other hand, if the operator fails to cut the current tape 24a despite being prompted to do so, it is possible that the remaining length of the current tape 24a will reach the first length due to its length. In such cases, the transport can be stopped and the pop-up can be displayed again to prompt the operator to cut the current tape.

[0115] The first length may be, for example, longer than one times the first reference length L1 shown in Figure 5. The first reference length L1 is the horizontal distance between the component suction position 23ba and the current tape detection unit PH2. By setting the first length to be longer than L1, the current tape 24a can be discharged efficiently.

[0116] Furthermore, the first length may be shorter than, for example, twice the first reference length L1. By setting the first length to be shorter than twice L1, it becomes possible to redisplay the pop-up at an appropriate timing.

[0117] Furthermore, when returning from step S15 to step S4, the pop-up that is displayed again is not limited to displaying the same screen as shown in Figure 11A; it may also display a different pop-up W20, as shown in Figure 11B, from pop-up W10.

[0118] Pop-up W20 has a mode continuation button W24 and a mode interruption button W26. If the operator presses the mode continuation button W24, the tape feeder 23 may execute the first mode again. If the operator presses the mode interruption button W26, the control unit 70 may display pop-up W10.

[0119] By displaying a more situation-appropriate message W22 in this way, the operator can take more appropriate action.

[0120] In step S10, the operator cuts the current tape 24a, making the length of the current tape 24a to its end shorter than the first length. This prevents the process from proceeding to step S15, and the current tape 24a can be discharged efficiently.

[0121] Figure 10C shows the flowchart for the second mode. As mentioned above, the second mode is a mode that efficiently restarts the suction of the component 5 by the mounting head 13.

[0122] The second mode allows for efficient restart of the component suction of the component 5 by the mounting head 13 when the component missing section B2 is short and the component 5 is still contained in the current tape 24a, as shown in Figure 4B. In the second mode, the control unit 70 transports the current tape 24a through the component missing section B2 and restarts the suction of the component by the mounting head 13. This allows the control unit 70 to efficiently restart production.

[0123] The control unit 70 transports the current tape 24a along the loop-shaped flow shown from step S20 to step S23.

[0124] The control unit 70 determines whether to detect the current tape 24a (S20). This is the same as S11 in the first mode, so the explanation is omitted.

[0125] If the current tape 24a is detected (Yes in S20), the control unit 70 determines whether the tape feeder 23 has transported the current tape 24a for a second length (S12).

[0126] If the length of current tape 24a transported by tape feeder 23 does not reach the second length (No in S21), tape feeder 23 transports the current tape 24a further (S23).

[0127] When the length of current tape 24a transported by tape feeder 23 reaches the second length (Yes in S21), tape feeder 23 stops transporting current tape 24a, and mounting head 13 starts picking up component 5 (S25).

[0128] The control unit 70 determines an adsorption error (S26). Specifically, the adsorption detection unit 13c detects the adsorption of the component 5 by the mounting head 13 and transmits the detection result to the control unit 70. The control unit 70 determines an adsorption error based on the detection result received from the adsorption detection unit 13c.

[0129] If no suction error occurs (No in S26), the second mode ends. The mounting head 13 then returns to the task of mounting the component 5 onto the circuit board 4.

[0130] If a suction error occurs (Yes in S26), the tape feeder 23 stops transporting the current tape 24a, and the control unit 70 displays a pop-up on the display screen 16a (S4).

[0131] The pop-up that appears again may be a different pop-up W30 from pop-up W10, as shown in Figure 11C. Pop-up W30 displays content that is more appropriate to the situation. Pop-up W30 has a message W32, which indicates whether to continue in the second mode or not. By displaying a more appropriate message W32, the operator can take more appropriate action. Furthermore, pop-up W30, like pop-up W10, has a first mode selection button W34, a second mode selection button W36, and an interruption selection button W38. This allows the operator to select and take appropriate action again.

[0132] Furthermore, in the second mode, if the current tape 24a is detected (No in S20), a pop-up is displayed (S24). The control unit 70 may also display the pop-up W40 shown in Figure 11D to confirm with the operator whether to switch to the next tape 24b. Alternatively, if the next tape detection unit PH1 does not detect the next tape 24b, the control unit 70 may display the pop-up W50 shown in Figure 11E to prompt the operator to set the next tape 24b.

[0133] The second mode is intended to transport a portion B2 containing missing parts of a few pockets, as shown in Figure 4B. Therefore, the second length for transporting the current tape 24a is set to be shorter than the first length.

[0134] The second length may be, for example, one or more times the second reference length L2 shown in Figure 3. The second reference length L2 indicates the distance between adjacent pockets 53. By setting the second length to be greater than or equal to the second reference length L2, it is possible to resume suction after transporting at least one pocket's worth of current tape 24a.

[0135] Furthermore, the second length may be, for example, three times or less the second reference length L2. By setting the second length to three times or less the second reference length L2, the current tape 24a can be transported by the required length.

[0136] Furthermore, the second length may be changeable by the operator. For example, the operator may change the second length to any length by operating the control unit 16.

[0137] The above is an example of the operation of the component mounting device 1 in the embodiment of the present disclosure.

[0138] Furthermore, the operation of the component mounting device 1 is not limited to the examples shown above.

[0139] In this embodiment, in the first mode, the control unit 70 determined whether to proceed to the loading operation of the next tape 24b based on the presence or absence of the current tape 24a detected by the first current tape detection unit PH2. However, the control unit 70 may also decide to proceed to the loading operation of the next tape 24b based on, for example, the loading of the current tape 24a for a first length, without using the first current tape detection unit PH2.

[0140] [summary] To summarize the above explanation, the features of this disclosure are described below.

[0141] The inventors investigated ways to improve the production efficiency of the component mounting device 1. When a continuous suction error occurs, there are two possibilities: (1) no more component 5 is stored in the current tape 24a (Figure 4A), and (2) the error is due to an accidental component shortage and component 5 is still stored in the current tape 24a (Figure 4B). However, with conventional component mounting devices, it is difficult to accurately determine between case (1) and case (2), requiring judgment and action by the operator. Therefore, the inventors investigated a component mounting device 1 and a component mounting method that can efficiently take action while assisting the operator's judgment.

[0142] First, in the event of a series of suction errors, the system displays a first mode corresponding to situation (1) and a second mode corresponding to situation (2), allowing the operator to select between them, thereby assisting the operator in making a decision.

[0143] In case (1), the current tape 24a should be ejected and the next tape 24b should be switched over. By using the first mode, the current tape 24a can be ejected efficiently and the next tape 24b can be loaded efficiently.

[0144] In case (2), the current tape 24a should be transported while the mounting head 13 resumes picking up the component 5. By using the second mode, the current tape 24a can be transported through the section B2 where the component is missing, and the mounting head 13 can efficiently resume picking up the component 5.

[0145] [effect] The component mounting device 1 / component mounting method of this embodiment can achieve the following effects.

[0146] The component mounting device 1 of this embodiment includes a tape feeder 23 that transports a current tape 24a containing components 5 in pockets 53 from the tape entrance 23a to a component suction position 23ba; a mounting head 13 that, at the component suction position 23ba, picks up the components 5 stored in the pockets 53 of the current tape 24a and mounts them to the substrate 4; a suction detection unit 13c that detects the suction of the components 5 by the mounting head 13; and an operation unit that, when the suction detection unit 13c detects a suction error, allows the operator to select either a first mode or a second mode. The unit comprises 16 and a control unit 70. The control unit 70 controls the tape feeder 23 to transport the current tape 24a for a first length when the first mode is selected in the operation unit, and determines whether or not to proceed to the loading operation of the next tape 24b to be transported after the current tape 24a. When the second mode is selected, the control unit 70 controls the tape feeder 23 to transport the current tape 24a for a second length shorter than the first length, and then controls the mounting head 13 to resume picking up the component 5.

[0147] Furthermore, the component mounting method of this embodiment is a component mounting method in which a component is supplied to a component suction position 23ba by a tape feeder 23, and the component 5 is picked up by a mounting head 13 and mounted on a substrate 4, the method comprising the steps of detecting a suction error by a suction detection unit 13c, and, in the step of detecting a suction error, if a suction error is detected, the operation unit 16 accepts the operator's selection of a first mode or a second mode. The process includes the steps of: when the first mode is selected, the control unit 70 controls the tape feeder 23 to transport the current tape 24a for a first length and decides whether or not to proceed with the loading operation of the next tape 24b to be transported after the current tape 24a; and when the second mode is selected, the control unit 70 controls the tape feeder 23 to transport the current tape 24a for a second length shorter than the first length, and then controls the mounting head 13 to resume picking up the component 5.

[0148] This configuration / method can improve production efficiency.

[0149] Furthermore, the component mounting device 1 of this embodiment includes a first current tape detection unit PH2 that detects the presence or absence of a current tape 24a. In the first mode, when the first current tape detection unit PH2 no longer detects the current tape 24a, the control unit 70 controls the tape feeder 23 to transition to the next tape 24b loading operation.

[0150] With this configuration, the switching from the current tape 24a to the next tape 24b can be performed automatically.

[0151] Furthermore, in the first mode, when the component mounting device 1 of this embodiment transports a current tape 24a of a first length, the control unit 70 detects the current tape 24a and, in response, allows the operator to choose whether or not to continue in the first mode via the operation unit 16.

[0152] With this configuration, the mode can be selected again, allowing for flexible processing.

[0153] Furthermore, in the second mode, the component mounting device 1 of this embodiment restarts the suction of the component 5 to the mounting head 13, and in response to the detection of a suction error by the suction detection unit 13c, the control unit 70 accepts the operator's choice via the operation unit 16 whether or not to continue in the second mode.

[0154] With this configuration, the mode can be selected again, allowing for flexible processing.

[0155] Furthermore, the component mounting device 1 of this embodiment further includes a next tape detection unit PH1 that detects the presence or absence of a next tape 24b. In the second mode, when the first current tape detection unit PH2 no longer detects the current tape 24a, the tape feeder 23 is controlled to proceed to the next tape 24b loading operation, or the operator is prompted to set the next tape 24b, depending on whether the next tape detection unit PH1 has detected the next tape 24b.

[0156] With this configuration, the operator can perform appropriate action if they do not intend to receive the next tape 24b.

[0157] Furthermore, the first length of the component mounting device 1 in this embodiment is longer than the horizontal distance from the component suction position 23ba to the first current tape detection unit PH2.

[0158] With this configuration, the current tape 24a can be ejected efficiently.

[0159] Furthermore, the first length of the component mounting device 1 in this embodiment is shorter than twice the horizontal distance from the component suction position 23ba to the first current tape detection unit PH2.

[0160] With this configuration, the pop-up can be displayed again at an appropriate time.

[0161] Furthermore, the second length of the component mounting device 1 in this embodiment is at least one times the distance between adjacent pockets 53 of the current tape 24a.

[0162] With this configuration, at least one pocket 53 minutes of current tape 24a can be transported, and the suction by the mounted head 13 can be resumed.

[0163] Furthermore, the second length of the component mounting device 1 in this embodiment is 10 times or less the distance between adjacent pockets 53 of the current tape 24a.

[0164] With this configuration, the current tape 24a can be transported for the required length.

[0165] Furthermore, the operating unit 16 of the component mounting device 1 in this embodiment has a display screen 16a, and the control unit 70 displays content related to the first mode and the second mode on the display screen 16a and accepts the operator's selection of the first mode or the second mode.

[0166] This configuration improves the ease of operation for the operator in selecting between the first and second modes.

[0167] Furthermore, in the component mounting device 1 of this embodiment, the control unit 70 displays on the display screen 16a a message prompting the cutting of the current tape 24a in connection with the execution of the first mode.

[0168] With this configuration, the operator can perform the work accurately.

[0169] While this disclosure is adequately described in relation to preferred embodiments with reference to the accompanying drawings, various modifications and alterations will be obvious to those skilled in the art. Such modifications and alterations should be understood to be included within the scope of the invention as defined by the appended claims. [Industrial applicability]

[0170] This disclosure is useful for component mounting apparatus / methods that use a tape feeder to supply components. [Explanation of Symbols]

[0171] 1. Component mounting device 2 Main body 3. Parts Supply Department 4 circuit boards 5 parts 10 Main unit side connector 11 Base 12. Substrate transport section 13 Mounted Heads 13a Nozzle 14. Head movement mechanism 16 Control section 16a Display screen 17 Main Unit Control 17a Adsorption judgment part 17b Image Processing Unit 17c Continuous adsorption error determination unit 17d Storage section 17da counter 17e Head movement control unit 17f Tape transport control unit 19 Cameras 21 bogies 22 reels 23 Tape feeder 23a Tape entrance 23b Parts supply port 23ba Parts suction position 23c outlet 23d Main unit 23da Core Unit 23dB Loading Unit 24 Carrier Tapes 24a Current Tape 24b Next Tape 28 barcodes 31 Feeder Base 32 Reel holding section 51 Base Tape 52 Top Tape 52a Extension 52b Tip 53 pockets 53a Pocket for storing the last part 54 feed holes 55 End of tape 60 Tape transport path 60a Bottom 60b top surface 61 Tape transport section 61a First conveyor sprocket 61b Second transport sprocket 61c Third conveyor sprocket 61d Drive unit 62 Tape input section 62a Delivery sprocket 62b Tape support section 62c drive unit 63 Shutter Unit 64 Unit Control Unit 64a Tape transport control unit 64b Storage section 65 Unit-side connector 66 Exposed part 70 Control Unit 92 Management device 95 Portable Information Terminals 95a Display Panel 100-component system D1 Downstream direction D2 Upstream direction L1 First reference length L2 Second standard length PH1 Next Tape Detection Unit PH2 First Current Tape Detection Unit PH3 Second Current Tape Detection Unit PH4 Third Current Tape Detection Unit W10, W20, W30, W40, W50, W60 Pop-up W12, W22, W32, W42, W52, W62 messages W14, W16, W18, W24, W26, W34, W36, W38, W44, W46, W54, W56, W66 Selection Button W64 Message Image

Claims

1. A tape feeder transports the current tape containing components in pockets from the tape entry point to the component suction position, A mounting head that, at the component suction position, picks up the component stored in the pocket of the current tape and mounts it to the substrate, A suction detection unit that detects the suction of the component by the mounting head, When the adsorption detection unit detects an adsorption error, the operation unit allows the operator to select either a first mode or a second mode. Control unit and Equipped with, The control unit, in the operation unit, When the first mode is selected, the tape feeder is controlled to transport the current tape for a first length, and a decision is made as to whether or not to proceed with the loading operation of the next tape to be transported after the current tape. When the second mode is selected, the tape feeder is controlled to transport the current tape for a second length shorter than the first length, and then the mounting head is controlled to resume the suction of the component. Component mounting device.

2. It includes a current tape detection unit that detects the presence or absence of the current tape, In the first mode, when the current tape detection unit no longer detects the current tape, the control unit controls the tape feeder to transition to the next tape feeding operation. The component mounting device according to claim 1.

3. In the first mode, when the current tape of the first length is transported, the control unit, in response to detecting the current tape, accepts from the operator via the operation unit whether or not to continue the first mode. The component mounting device according to claim 2.

4. In the second mode, after restarting the suction of the component by the mounting head, the control unit, in response to detecting a suction error by the suction detection unit, receives a selection from the operator via the operation unit whether or not to continue in the second mode. The component mounting device according to claim 1.

5. The system further includes a next tape detection unit for detecting the presence or absence of the next tape, and in the second mode, when the current tape detection unit stops detecting the current tape, the system controls the tape feeder to proceed to the next tape loading operation, or prompts the operator to set the next tape, depending on whether the next tape detection unit has detected the next tape. The component mounting device according to claim 2.

6. The first length is longer than the horizontal distance from the component suction position to the current tape detection unit. The component mounting device according to claim 2.

7. The first length is shorter than twice the horizontal distance from the component suction position to the current tape detection unit. The component mounting device according to claim 2.

8. The second length is at least one times the distance between adjacent pockets of the current tape. The component mounting device according to claim 1.

9. The second length is no more than 10 times the distance between adjacent pockets of the current tape. The component mounting device according to claim 1.

10. The aforementioned operating unit has a display screen, The control unit displays content related to the first mode and the second mode on the display screen and accepts the operator's selection of the first mode or the second mode. The component mounting device according to claim 1.

11. The control unit, in connection with the execution of the first mode, displays on the display screen content prompting the cutting of the current tape. The component mounting device according to claim 10.

12. A component mounting method comprising supplying components to the component suction position using a tape feeder, and then using a mounting head to pick up the components and mount them onto a circuit board, The adsorption detection unit detects an adsorption error, In the step of detecting the aforementioned suction error, if the suction error is detected, the operation unit takes the step of accepting the operator's selection of either the first mode or the second mode. When the first mode is selected, the control unit controls the tape feeder to transport the current tape for a first length and determines whether or not to proceed with the loading operation of the next tape to be transported after the current tape. When the second mode is selected, the control unit controls the tape feeder to transport the current tape for a second length shorter than the first length, and then controls the mounting head to resume the suction of the component. including, Parts installation method.

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