TWI741623B - Tail glue forming method and device - Google Patents

Abstract

The present invention provides a tail glue forming method and device, including: providing a pulling mechanism to hold an adhesive tape with a holding part at a front end, a holding part and a rear end holding a clamping part, the holding part links the adhesive tape on a moving path, Down displacement; provide a cutting knife and a seat on both sides of the moving path respectively, the seat is provided with a cutting area; the seat swings to a working position so that the cutting area swings in an arc-shaped path Move into the moving path and be correspondingly embedded by the cutter, and cut the tape to form a tail glue; the abutment is interlocked by the downward displacement of the retainer to move out of the moving path to a retreat position. , So that the holding part drags the front end of the tail glue downward from one side over the cutting area of the seat, and attaches the tail glue to a carrier tape; thereby, the structure of the device can be simplified.

Description

Tail glue forming method and device

The invention relates to a tail glue forming method and device, in particular to a tail glue forming method and device for forming a tail glue for positioning a carrier tape in a reel.

According to, general electronic components have different physical characteristics, so they often need to be packaged through testing and classification procedures. During the packaging process, the electronic components are often placed in intermittent linear conveying and there are equidistantly arranged plural recessed carriers. In a carrier tape of one of the slots, the carrier tape that has contained the electronic components is then passed through the film sealing mechanism, and the clip above the carrier slot of the carrier tape is sealed with a film to prevent the electronic components from escaping from the carrier slot , And wind the carrier tape after sealing film in a reel into a roll, and after reaching a certain number of layers, attach a tail glue to the end of the carrier tape wound in the reel to Form positioning The device for forming the tail glue and attaching it to the carrier tape can be disclosed in the Patent No. I267439 "Apparatus and Method for Forming and Connecting Seal Tapes": a first actuator drives the tape to form A folding plate on the unit moves horizontally to reset; then a second actuator drives a cutter to move horizontally to reset and a third actuator drives a cutter mold to move horizontally to reset, so that the end of the cutter is The folded cover tape is cut, and after the cover tape is cut, the cutter is separated from the cutter mold to form a channel for the cover tape forming unit to pass through, and the cover tape forming unit passes through The channel and the processed cover tape is attached to the electronic transmission tape; However, the aforementioned device for forming the tail glue and attaching it to the carrier tape uses multiple actuators to drive the displacement of functional elements such as the folding plate, the cutter, and the cutter mold. This not only increases the manufacturing cost, but also causes the device to move. The complexity of the overall organization; Therefore, in order to solve the problem of the complexity of the mechanism, the patent No. I602745 "Forming and fixing device for band-shaped members" also discloses a device for forming and attaching the tail glue to the carrier tape. It is provided with a device at the end of the unit body. The rotating block can rotate between the first rotating position and the second rotating position with the up and down displacement of the unit body, and the holding surface of the rotating block can be sucked and cut The broken sealing tape is attached to the carrier tape via the holding surface of the rotating block.

However, in the conventional patent No. I602745, because the rotating block is arranged on the unit body, the load of the unit body will increase, which affects the flexibility of the unit body; and the adsorption unit is changed to a place that needs to be rotated frequently. The rotating block increases the processing of the fine air pressure channels on the rotating block and the arrangement of the air pressure pipes, which makes the structure between the end of the unit body and the rotating block more complicated, and therefore needs to be further improved.

Therefore, the purpose of the present invention is to provide a tail glue forming method that can overcome at least one of the disadvantages of the prior art.

Another object of the present invention is to provide a tail glue forming device that can overcome at least one of the disadvantages of the prior art.

Another object of the present invention is an apparatus for performing the method for forming tail glue.

A method for forming a tail glue according to the object of the present invention includes: providing a pulling mechanism to hold an adhesive tape with a holding part at a front end and a holding part at a rear end of a holder, and the holding part can link the adhesive tape on a moving path. Down displacement; a cutter and a seat are provided on both sides of the moving path, the seat is provided with a cutting area; the seat is swung to a working position to make the cutting area move in an arc The path swings into the moving path and is correspondingly embedded by the cutter, and the tape is cut to form a tail glue; when the holder is moved downwardly by the holding member, it resists and interlocks and swings out of the moving path in an arc-shaped motion path. To a retreat position, the holding part drags the front end of the tail glue downward from one side over the cutting area of the seat, and attaches the tail glue to a carrier tape.

According to another object of the present invention, a tail glue forming device includes: a machine panel; a pulling mechanism, arranged on the machine panel, including a holding member, the front end of the holding member is provided with a holding part, and the rear end is provided There is a clamping part for holding a tail glue between the holding part and the clamping part. The holding piece can move the tail glue up and down in a moving path; a cutter and a seat are respectively arranged in On the panel of the machine on both sides of the moving path, the abutment seat is provided with a cutting area; the abutment seat is separated from the holder but can swing when the holder is displaced by the interference action, so that the cutting area is in an arc The moving path swings into the moving path to a working position corresponding to the cutter, or an arc-shaped moving path swings out of the moving path to a retreat position, so that the holding part drags the tip of the tail rubber downward from One side crosses the cutting area of the seat.

Another object of the present invention is a tail glue forming device, which is a device for performing the tail glue forming method as described above.

According to the embodiment of the present invention, the tail glue forming method and device, the pulling mechanism uses the holding part at the front end of the holder and the clamping part at the back end to hold the adhesive tape and link the adhesive tape to move up and down during the moving path , The abutment seat does not need to be provided with a driver or connected to the pulling mechanism, the abutment seat can also swing into the movement path or swing out of the movement path, which can not only reduce the load of the pulling mechanism but also The structure is simplified and the tail glue is attached to the carrier tape.

Referring to Fig. 1, the tail glue forming method of the embodiment of the present invention can be illustrated by the device shown in the figure, and the device is provided with: A machine panel T is erected; A pulling mechanism A is arranged on the machine panel T, and the pulling mechanism A is provided with a holding member A1 that can be driven to move up and down relative to a moving path of the machine panel T in a vertical direction; the holding member A holding part A11 is provided at the rear end of A1, and a holding part A12 is provided at the front end of the holder A1; A cutting mechanism C, with a cutter C1 located on one side (left side) of the moving path on the machine panel T; An abutment mechanism E is provided with an abutment seat E1 located on the other side (right side) of the movement path on the machine panel T and corresponding to the cutting mechanism C, and the abutment seat E1 is provided with a cutting area E11.

The clamping portion A11 of the pulling mechanism A is provided with a fixed clamping member A111 and a movable clamping member A112. The movable clamping member A112 is driven by a first driving member A2, such as a pneumatic cylinder, to move up and down to change The size of a clamping opening A113 between the fixed clip A111 and the movable clip A112; the holding portion A12 is provided with an abutting surface A121, a drilling surface A122 and a sliding surface A123, and the abutting surface A121 is located at the holding portion A12 A vertical surface on one side, the drilling surface A122 is an oblique surface at the upper left and lower right on the bottom side of the holding portion A12, and the sliding surface A123 is an oblique surface at the lower left and upper right on the other side of the holding portion A12; The inclination of the drilling surface A122 is approximately parallel to the oblique conveying path of the carrier tape B1 conveyed by a carrier tape conveying mechanism B; the holding part A12 is provided with a plurality of suction passages A124 through which negative pressure is passed. A121 is provided with two abutment suction holes A1211, the drill face A122 is provided with two drill face suction holes A1221, the back face suction hole A1211 and the drill face suction hole A1221 are respectively connected to the suction channel A124.

The cutter C1 of the cutting mechanism C is set on a cutting seat C2 and is driven by a second driving member C3, such as a pneumatic cylinder, to move left and right toward the drawing mechanism A in a horizontal displacement path. Or away, so that a tape D is transported to the cutting mechanism C by a tape conveying mechanism (not shown), and then can be carried to the pulling mechanism A by the cutting mechanism C to be held; the cutting seat C2 There is a pushing piece C21, a fork inserting piece C22, and a pressing piece C23.

The seat mechanism E is provided with a fixed seat E2 and an elastic member E3, such as a tension spring, which connects both ends of the seat E1 and the fixed seat E2, respectively.

1 and 2, the pushing member C21, the cutting knife C1, the fork member C22, and the pressing member C23 of the cutting mechanism C are sequentially arranged on the cutting seat C2 from top to bottom; The abutment member C21 is provided with an abutment surface C211 that is inclined downward toward the abutment mechanism E and is approximately parallel to the drill surface A122 of the holding portion A12; An insertion distance C222 is approximately equal to the width of the tape D so that the tape D can be held between the two forks C221.

Referring to Figures 1 and 3, the fixing seat E2 is set on the machine panel T, the abutting seat E1 is located below the fixing seat E2, and is positioned on a pivot on the other side of the cutting area relative to the cutter C1 The connecting piece E12 is pivoted on the machine panel T. The abutting seat is separated from the holding piece and separated by a distance, but can be in contact with each other when the holding piece A1 is displaced. The pivoting piece E12 is used as the center of rotation and can be opposed to each other. The machine panel T swings, the fixing seat E2 is provided with a stopper E21 located below and arranged horizontally, and a fixing member E22 located above and arranged vertically. The upper end of the elastic member E3 is connected to the fixing member E22. The lower end of the piece E3 is connected to the receiving seat E1; the pivotal piece E12 is located at an end of the receiving seat E1 away from the cutting area E11; the cutting area E11 is slit-shaped and is located on the receiving seat E1 close to the cutting mechanism One end of C corresponds to the cutter C1; the upper side of the cutting area E11 is provided with a guide groove E13, and the guide groove E13 is correspondingly provided on the displacement path of the pulling mechanism A up and down, and allows the holding part A12 to be embedded The rolling wheel E14 may be, for example, a roller or a bearing, and a rolling wheel E14 is provided on one side of the seat E1 between the pivotal member E12 and the cutting area E11 and is located on the displacement path of the pulling mechanism A up and down; An abutting portion E15 protrudes from the upper side of the rolling wheel E14 of the abutting seat E1 to reliably abut against the stopper E21 of the fixing seat E2.

Referring to Figures 3, 4, and 5, the pulling mechanism A can move up and down on the moving path between a first position and a second position, wherein the first position is that the holding portion A12 is located on the seat At the position above E1, the second position is the position where the holding portion A12 is located below the seat E1 and abuts the carrier tape conveying mechanism B, and the clamping opening A113 corresponds to the position of the fork insert C22; When the pulling mechanism A is in the first position, the elastic member E3 exerts an elastic force on the abutment E1 to make the abutment E1 swing so that the cutting area E11 moves in a clockwise arc. The path swings into the moving path, so that the abutting portion E15 of the abutment seat E1 reliably abuts against the lower end of the stop piece E21 of the fixing seat E2 and is blocked, so that the abutment seat E1 is maintained at an approximately horizontal operating position Corresponding to the cutter C1, so that the cutter C1 can be smoothly inserted into the cutting area E11 of the seat E1 when the cutter C1 is horizontally displaced to the right; When the pulling mechanism A is vertically displaced downward from the first position to the second position, the holding member A1 of the pulling mechanism A will move downwards and the pivotal member E12 will be displaced relative to each other, so that the holding portion A12 can be inserted into the guide groove E13 of the abutment seat E1 and press the abutment seat E1 downwardly, so as to link the abutment seat E1 to swing so that the cutting area E11 swings and deviates in a counterclockwise arc motion path Out of the moving path, the abutment seat E1 swings downward from the working position to a retreat position and accumulates the elastic restoring force of the elastic member E3; and the holding member A1 is displaced downward to make the cutting area of the abutment seat E1 When E11 swings in the arc-shaped motion path, the abutment seat E1 simultaneously makes the rolling contact with the rolling wheel E14 and the side of the holder A1; When the pulling mechanism A moves vertically upward from the second position and returns to the first position, the abutment seat E1 is acted on by the elastic restoring force of the elastic member E3 and then swings in the arc-shaped motion path in the clockwise direction. The moving path returns to the operating position, and the elastic element E3 provides a driving force for the cutting area E11 of the abutting seat E1 to approach the holding portion A12 at the front end of the holding element A1 when the cutting area E11 is located in the operating position.

Please refer to Figures 1 and 2. In the embodiment of the present invention, one side of the tape D with adhesive faces the cutting mechanism C so that the rear end of the tape D can be attached to the cutter C1 and held on the two sides. Between the forks C221; refer to Figures 5 and 6, the pulling mechanism A is vertically displaced downward to the second position, so that the clamping opening A113 of the clamping portion A11 corresponds to the embedding fork of the cutting mechanism C C22; after the pulling mechanism A is displaced to the second position, the second driving member C3 of the cutting mechanism C drives the cutting seat C2 to move horizontally to the right and approach the pulling mechanism A to link the The fork insert C22 with the tape D held on it extends into the clamping opening A113, and at the same time, the pressing piece C23 located under the fork insert C22 is linked with the tape D not extending into the clamping opening A113. Partially press against the side of the fixing clip A111 to prevent the tape D from falling off; when the fork insert C22 extends into the clamping opening A113, the tape D in the clamping opening A113 is folded into a ">" In the aspect, the fork insert C22 is divided into a first plastic section D11 located above and a second plastic section D12 located below; the first driving member A2 is continued to drive the movable clamping member A112 vertically downward Displacement, so that the movable clamp A112 and the fixed clamp A111 clamp the first rubber section D11 and the second rubber section D12 to form a folded end D1; after the folded end D1 is formed, the second drive member C3 Drive the cutting seat C2 to move horizontally to the left away from the pulling mechanism A and the pulling mechanism A continuously clamps the folded end D1 of the upper end of the tape D with the clamping portion A11, so that the rear end of the tape D is positioned and held On the pulling mechanism A; please refer to FIG. 7, in the state where the rear end of the tape D has been held in the clamping portion A11 of the pulling mechanism A, the pulling mechanism A is vertical from the second position Displacement upward to the first position, so that the adhesive tape D is pulled upward on the moving path for a predetermined length by the holding member A1. The pulling mechanism A moves upward by a distance such that the holding portion A12 is higher than the cutting The horizontal height of the pushing member C21 of the cutting mechanism C; referring to Figures 8 and 9, after the pulling mechanism A is displaced to the first position, the first cutting mechanism C on the side of the moving path The two driving members C3 drive the cutting seat C2 to move horizontally to the right to approach the seat mechanism E on the other side of the moving path, so as to link the end of the cutter C1 to be inserted into the cutting area E11 of the seat E1 , Thereby cutting the tape D pulled upwards into a tail glue D2 and a section to be formed D3, and at the same time, the pushing member C21 is also linked by the cutting seat C2 to cut the tail glue The front end of D2 approaches the holding part A12, and the suction channel A124 of the holding part A12 is passed into negative pressure, so that the front end of the tail glue D2 is adsorbed and held on the supporting surface A121 and the drilling surface of the holding part A12 On A122, the end glue D2 is held between the holding portion A12 and the clamping portion A11, and the holding member A1 can move the end glue D2 up and down in a moving path; the cutting mechanism C is cutting Cut it After the tape D is taped, the rear end of the section D3 to be formed abuts on the cutting knife C1 and the fork insert C22, and the second driving member C3 drives the cutting seat C2 to move horizontally to the left away from the seat mechanism E 9 and 10, the pulling mechanism A is vertically displaced downward from the first position to the second position. During the vertical downward displacement of the pulling mechanism A, the holding portion A12 will move downward The abutting seat E1 is linked to the collision and pushing the abutting seat E1 to swing out of the moving path in a counterclockwise arc-shaped motion path and swing down from the operating position to the retreat position, where the abutting seat E1 swings Without changing the horizontal and vertical positions of the axis, the pulling mechanism A can pass through the cutter C1 of the cutting mechanism C and the seat of the seat mechanism E respectively located on both sides of the moving path In the area between E1, the holding portion A12 will drag the front end of the tail glue D2 downward from one side over the cutting area E11 of the seat E1; after the pulling mechanism A reaches the second position, the clamping portion A11 releases the clamping of the folded end D1, so that a side surface of the tail glue D2 with glue is attached to the carrier tape B1 of the carrier tape transport mechanism B by the holding portion A12.

In the embodiment of the present invention, the tail glue forming method and device, the pulling mechanism A uses the holding part A12 at the front end of the holder A1 and the clamping part A11 at the rear end to hold the adhesive tape D and link the adhesive tape D on a moving path During the downward displacement process, the abutment seat E can also swing into the movement path or swing out of the movement path without the need for a driver or connection with the pulling mechanism A, which not only reduces The load of the pulling mechanism A can also simplify the structure and facilitate the attachment of the tail glue D2 to the carrier tape B1.

Please refer to FIG. 11, another embodiment of the abutment mechanism of the embodiment of the present invention, a seat F1 of the abutment mechanism F is pivoted at the approximate center of the abutment seat F1 by a pivoting member F11, and the abutment seat F1 An elastic member F3, such as a compression spring, is provided between F1 and a fixing seat F2 above it. The elastic member F3 is provided at the other end of the pivotal member F11 of the abutment seat F1 away from the cutting area F12, and provides the abutment seat F1 The elastic resistance when swinging counterclockwise.

Please refer to FIG. 12, another embodiment of the abutment mechanism of the embodiment of the present invention, a seat G1 of the abutment mechanism G is pivoted at approximately the center of the abutment seat G1 by a pivoting member G11, and the abutment seat G1 A fixing seat G2 is arranged below G1, and an elastic member G3 such as a tension spring is arranged between the abutting seat G1 and the fixing seat G2. The elastic member G3 is arranged on the pivot of the abutting seat G1 away from the cutting area G12 The other end of the connecting piece G11 provides elastic resistance when the abutment G1 swings in a counterclockwise direction.

Please refer to FIG. 13, another embodiment of the abutment mechanism of the embodiment of the present invention, so that a seat H1 of the abutment mechanism H is pivoted at an end of the abutment seat H1 away from the cutting area H12 by a pivot member H11 , And a fixing seat H2 is arranged under the bearing seat H1, an elastic member H3 such as a compression spring is arranged between the bearing seat H1 and the fixing seat H2, and one end of the elastic member H3 abuts against the pivotal member H11 and the Between the cutting areas H12, it provides elastic resistance when the abutment seat H1 swings in a counterclockwise direction.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

A: Pulling mechanism A1: Holder A11: Clamping part A111: fixed clip A112: Movable clip A113: Clip A12: Holding part A121: Lean A1211: Suction hole on the surface A122: Drill face A1221: Drill face suction hole A123: slippery surface A124: Inspiratory tract A2: The first driver B: Carrier belt conveyor mechanism B1: Carrier tape C: Cutting mechanism C1: Cutter C2: Cutting seat C21: Push the piece C211: Push to face C22: Insert Fork C221: Two forks C222: Insertion distance C23: Pressed parts C3: The second driver D: Tape D1: Folding end D11: The first glue section D12: The second glue section D2: Tail glue D3: To be formed E: Arrivals E1: Arrival E11: Cutting area E12: pivot E13: Guide groove E14: scroll wheel E15: Leaning Department E2: fixed seat E21: Stop E22: fixed parts E3: Elastic part F: Arrival organization F1: Arrival F11: pivot F12: crop area F2: fixed seat F3: Elastic part G: Arrival organization G1: Arrival G11: pivot G12: crop area G2: fixed seat G3: Elastic part H: Arrival organization H1: Arrival H11: pivot H12: Cutting area H2: fixed seat H3: Elastic part T: machine panel

Fig. 1 is a schematic diagram of the configuration of each mechanism of the tail glue forming device in the embodiment of the present invention. Fig. 2 is a three-dimensional schematic diagram of the cutting mechanism in the embodiment of the present invention. Fig. 3 is a three-dimensional schematic diagram of the seating mechanism in the embodiment of the present invention. 4 is a schematic diagram of the pulling mechanism in the first position and the seat in the working position in the embodiment of the present invention. Fig. 5 is a schematic diagram of the pulling mechanism in the second position and the seat in the retreat position in the embodiment of the present invention. Fig. 6 is a schematic diagram of the embedding member with adhesive tape extending into the clamping mouth in the embodiment of the present invention. Fig. 7 is a schematic diagram of the pulling mechanism pulling up the tape in the embodiment of the present invention. Fig. 8 is a schematic diagram of tape cutting by a cutting mechanism in an embodiment of the present invention. Fig. 9 is a schematic diagram of the tail glue being held by the holder in the embodiment of the present invention. Fig. 10 is a schematic diagram of the tail glue being attached to the carrier tape in the embodiment of the present invention. Fig. 11 is a schematic diagram of another embodiment of the seating mechanism of the present invention. Fig. 12 is a schematic diagram of another embodiment of the seating mechanism of the present invention. Figure 13 is a schematic diagram of yet another embodiment of the seating mechanism of the present invention.

A: Pulling mechanism

A1: Holder

A11: Clamping part

A111: fixed clip

A112: Movable clip

A113: Clip

A12: Holding part

A121: Lean

A1211: Suction hole on the surface

A122: Drill face

A1221: Drill face suction hole

A123: slippery surface

A124: Inspiratory tract

A2: The first driver

B: Carrier belt conveyor mechanism

B1: Carrier tape

C: Cutting mechanism

C1: Cutter

C2: Cutting seat

C21: Push the piece

C22: Insert Fork

C23: Pressed parts

C3: The second driver

D: Tape

E: Arrivals

E1: Arrival

E11: Cutting area

E2: fixed seat

E3: Elastic part

T: machine panel

Claims (13)

A method for forming tail glue includes: providing a pulling mechanism to hold an adhesive tape with a holding part at a front end and a holding part at a rear end of a holding part, and the holding part can move the adhesive tape up and down in a moving path in conjunction with the holding part; A cutting knife and an abutment seat are respectively arranged on both sides of the moving path, and the abutment seat is provided with a cutting area; the abutting seat swings to a working position so that the cutting area swings into the moving path in an arc shape. The moving path is correspondingly embedded by the cutter, and the tape is cut to form a tail glue; when the holder is moved downwards, the abutment seat swings in an arc-shaped movement path to deviate from the moving path to a retreat position. The holding part drags the front end of the tail glue downward from one side across the cutting area of the seat, and attaches the tail glue to a carrier tape. According to claim 1, the tail glue forming method, wherein the abutment seat swings with a pivotal member located on a machine panel as the center of rotation, and the pivotal member is located at another cutting area relative to the cutter. side. According to claim 2, the tail glue forming method, wherein when the retaining member is displaced downward, it generates a relative displacement with the pivotal member. The tail glue forming method according to claim 1, wherein when the cutting area of the abutment seat swings in the arc-shaped movement path, the abutment seat simultaneously uses a rolling wheel to make rolling contact with one side of the holder. The tail glue forming method according to claim 1, wherein the abutment is swung to the working position so that the cutting area is moved into the moving path by the arc-shaped motion path, by applying elasticity to the abutment Force. According to the method for forming tail glue according to claim 1, wherein when the abutting seat is swung to the operating position, a stopper of a fixing seat on the panel of the machine is used to stop and position the abutment seat. A tail glue forming device includes: a machine panel; a pulling mechanism, arranged on the machine panel, and comprising a holding part. The front end of the holding part is provided with a holding part and the rear end is provided with a clamping part. A tail glue is held between the holding part and the clamping part, and the holding member can move the tail glue up and down in a moving path; On the machine panel, the abutment seat is provided with a cutting area; the abutment seat is separated from the holder but can be moved by the contacting action when the holder is displaced, so that the cutting area swings into the movement in an arc-shaped motion path A working position in the path corresponds to the cutter, or an arc-shaped moving path swings out of the moving path to a retreat position, so that the holding part drags the tip of the tail rubber downward from one side over the abutment seat The crop area. The tail glue forming device according to claim 7, wherein a guide groove is provided above the cutting area of the abutment seat, and when the holding member is displaced downward, the holding part provided at the front end of the holding member can be inserted into the guide Slot. The tail glue forming device according to claim 7, wherein the abutment seat is pivoted on a pivotal member spaced a distance from the holding member on the machine panel, and can swing with the pivotal member as the center of rotation . According to claim 9, the tail glue forming device, wherein a rolling wheel is provided on one side of the abutting seat between the pivotal member and the cutting section, and one side of the holding member makes rolling contact with the rolling wheel when the holder is displaced. The tail glue forming device according to claim 9, wherein the pivotal member and the cutting area are provided with an abutting portion on one side of the abutting seat, and when the cutting area of the abutting seat is at the working position, the abutting portion The abutting part abuts against a fixed seat on the panel of the machine table. The tail glue forming device according to claim 7, wherein an elastic member is provided between the abutment seat and a fixing seat provided on the machine panel, and the elastic member provides the cutting area of the abutment seat at the operating position , The driving force for the cutting area to approach the holding part of the front end of the holding member. A tail glue forming device includes: a device for executing the tail glue forming method according to any one of claims 1 to 6.

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