JPS63160399A - Electronic parts mounter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION B) Field of Industrial Application The present invention relates to an apparatus for mounting small leadless electronic components such as chip-type capacitors and chip-type resistors onto a circuit board.

(b) Conventional technology-leading 4-type electronic components (hereinafter simply referred to as "components")
The mounting operation is a repeated operation of picking up a component from a component supply device using vacuum suction means, transporting it onto a board, and pressing the component against adhesive or solder paste applied to the board.

An example of a device for performing such work is disclosed in Japanese Patent Application Laid-Open No. 55-24494.
This can be seen in Japanese Patent Application Laid-open No. 60-182795.

Now, in the equipment that performs the above work, the lifting and lowering system of the vacuum suction means is normally performed by a cam, and the cam curve is devised so that when the vacuum suction means is pressed against the components in the parts supply device, or when the parts are pressed against the board. When pressing the parts, avoid applying excessive shock to the parts. However, as the use of chips in electronic components progresses, the types of chip components increase and the thickness and dimensions become more diverse, making it extremely difficult to keep the impact or pressure applied by vacuum suction means to any component within an allowable range. Ta.

As a measure to solve this problem,
In No. 0, the vacuum suction means is driven by an IJ near motor,
We are proposing a device that maintains an appropriate speed when a vacuum suction means hits a component or when a fully suctioned component is pressed against a substrate by controlling a linear motor. By adopting such a device, various problems such as cracking of parts due to excessive impact or mounting errors due to jumping of the vacuum suction means are expected to be solved; Application to the rotary index table described in JP-A No. 60-182795, in which a large number of vacuum suction means are arranged around the periphery, requires a large number of linear motors to be installed, which significantly increases the mass of the rotating system. However, it is difficult to realize this because the cost of the equipment increases significantly.

(C) Problems to be Solved by the Invention The present invention provides a plurality of vacuum suction means disposed around the periphery of a support means that rotates intermittently in a fixed direction, and places the vacuum suction means on a component supply device or In a device that sucks and mounts components by lowering it each time it comes onto a board, the vacuum suction means is intended to maintain the impact applied to the components below a certain level regardless of the thickness of the component. It is something.

(d) Means for solving the problem In the above device, the vacuum suction means is raised and lowered by an elevating body operated by a cam. , place it where you need it. Among the elevating and descending bodies, those assigned to parts where impact on parts should be particularly taken into consideration are connected to the cam via a stroke expansion/contraction means that expands/contracts the operating stroke.

(e) The operating stroke of the elevating body is extended for thin parts and shortened for thick parts. As a result, for any part, the deceleration section in the cam curve can be fully utilized to press the vacuum suction means against the part or to press the part against the board, and since the part is thick, the deceleration is sufficient. This prevents the vacuum suction means or the substrate from coming into contact with the component before the vacuum suction is performed.

(f) In the embodiment diagram, (1) is a support means that performs intermittent rotation in a fixed direction. The support means (1) consists of an upper rotating body (2) and a lower rotating body (3), both of which have a circular planar shape and are fixed to a vertical index shaft (4). The index shaft (4) rises from an indexing device (not shown), and its upper end is supported by a bearing part (6) of a stationary deck (5) placed on the support means (1). The inside of the index shaft (4) is an intake passage (7) that communicates with a vacuum source (not shown).The support means rotates by 45 degrees, and there are eight locations around the circumference as shown in Figure 6. Work station (1)...
・(■) is arranged, and eight wooden arms (8) are made to protrude radially from the lower rotating body (3) in accordance with this.

The arm (8) is supported by a slider (9) attached perpendicularly to the circumferential surface of the lower rotating body <3), and is movable in the vertical direction. The slider (9) is pulled up by a spring (10) stretched between it and the upper rotating body (2) until it hits a stop collar bolt (11) (Fig. 11) screwed into the upper rotating body (2). The slider (9) is turned outward
7 (12) is protruded, and the elevating body pushes the roller at a predetermined work station to lower the slider (9). The elevating body and its operating mechanism will be described later.

The arm (8) supports a turret (20) at its tip.

The turret (20) has a cylindrical shape, fits onto the tip of the arm (8) from the outside, and rotates around the axis of the arm (8).
That is, it is rotatable around a horizontal axis.

A driven gear (21) is attached to the outward end face of the turret (20).
) is fixed and floating. Four types of suction nozzles (22>(23)(24)(
25) protrude radially at 90° intervals. Each suction nozzle can be retracted toward the center of the turret (20), and is pushed to a protruding position by a spring (26).The center of the arm (8) is an intake path (27). The intake path (27) includes suction nozzles (22) (23)
Among (24) and (25), only the one directly below communicates through the communication hole (28). <29) is the intake path (27
The screw plug that locks the end of the turret (20) also serves as a stopper for removing the turret (20). Arm configured like this (8)
and its attached elements are collectively referred to as vacuum suction means (30).

The upper rotating body (2) supports the valve (40). The valves (40) are provided in the same number as the arms (8), and are connected to the intake path (27) by a hose (41). Valve〈40)
is connected to the intake path (7) by a hose (42),
This is for ON-OFF control of suction in the intake path (27). The valve (40) is opened and closed by a lever-type actuator (43) having a roller at its tip.

That is, when the actuator (43) is pushed down, the pulp is open, and when it is not, the valve is closed. The actuator (43) is controlled by a presser (4) that is moved up and down by an air cylinder (44) at the work station (1).
5), in the work stations (V) and (Vl), the presser (
47), the work stage Kun (I[) (I
II) (Vr'') is carried out by a press plate (48) fixed to the bearing part (6). The press plate (48) also serves as a support member for the air cylinders (44) and (46), and ) (47) forms a plane substantially continuous with the pressing body (48) when lowered.Since each valve (40) is arranged at a lagging position with respect to the arm (8) to which it belongs, The pressure plates (45) and (47) are also located at a position offset from the work station to which they belong.

A component supply device (50) is arranged in the work station (I).The component supply device (50) feeds a component supply carrier tape (51) one pitch at a time, and picks up the components (52) one by one by vacuum suction means ( 30). The carrier tape (51) is made by embossing a plastic chip sheet to create recesses for storing the parts (52) one by one, and covering the recesses with a plastic cover film (53). The cover film (53) is peeled off immediately before the component suction position.The component supply device (50) has a large number of such carrier tapes (51) lined up in a direction perpendicular to the page (Fig. 1), and the whole By moving the tape in a direction perpendicular to the plane of the page, a carrier tape (51) containing the required parts can be selected.

The work station (V) is an XY machine with a board (60) placed on it.
Arrange the table (61) (Fig. 11) Arrange the parts collection box (62) at the 0 work station (Vl) Arrange the parts attitude determination device (63) at the 0 work station (VI>)
). The attitude determination device (63) is constituted by a fort sensor, and is placed at a height where the light beam crosses directly below the normally suctioned parts.

A suction nozzle selection device (70) shown in FIG. 7.9 is arranged at the work station (■) or (■).

The main component of this device (70) is an elevator (71) supported by a stationary deck (5). The elevator (71) is attached to a slider (72) that slides in the vertical direction, and is given ascending and descending motion by a lever (73) that transmits the movement of a cam (not shown). A selector gear (74) is horizontally supported at the bottom of the elevator (71) so as to face the rotation center of the support means (1). The selector gear (74) is connected to the electric motor (75) supported by the elevator (71) via bevel gears (76) (77), and when the elevator (71) descends, the turret (2
The driven gear (21) meshes with the driven gear (21) of 0).
The rotation of the electric motor (75) is transmitted to. (713> is a stopper that determines the lower limit of descent of the elevator (71).

A lock pin (80) is attached to the upper surface of the arm (8). The lock bin (80) is held in a holder (81) fixed to the arm (8) so that it can slide parallel to the axis of the arm (8), and the lock bin (80) is held by a spring (82) toward the turret (20).
is pressed. The end face of the turret (20) has four grooves (83) for receiving the tips of the lock pins (80), one groove each behind the suction nozzles (22), (23), (24), and (25). Set in a row. A U-shaped lever holder (84) is fixed to the rear end of the lock bin (80). Lever holder (84
) receives one end of a bell crank type lever (85) supported by the fixed deck (5). The other end of the lever (85) is connected to the connecting rod (86) to the elevator (71).
are connected.

Place the lifting body (90) at work station (I) (l) When placing the centering or direction setting device for suction parts at work station (I[) or (III), place the lifting body (90) here as well. The elevating body (
Reference numeral 90) is a rod-shaped member supported by the bearing part (91) of the fixed deck (5), which is prevented from rotating by a sliding key (92) and can only be moved up and down. A pressing head (93) facing the roller (12) of the slider (9) is fixed to the lower end of the elevating body (90), and a flange (94) is fixed to the upper end.
to be fixed. The elevating body 90) is pushed downward by a spring (95) inserted between the bearing part (91) and the pressing head (93). (96) is a camshaft, and (97) is a cam that rotates together with the camshaft (96) and gives movement to the elevating body (90). A stroke expansion/contraction means (100) connects the cam (97) and the elevating body (90), and is constructed as follows. (101) is Fudo Detsuki (
5) This is a small deck fixed on top of the cam (97).
A pair of guide bars (102) and a screw shaft (103) are connected in parallel to the line connecting the and the elevating body (90).
Both are supported horizontally. The guide bar (102) supports the slider (104). Inside the slider (104) is a nut (105) that is screwed onto the screw shaft (103).
) is held in a form that does not move relative to the slider (104) itself.

(106) is the roller (107) that contacts the cam (97)
It is a seesaw lever having a roller (10g>) for lifting the flange (94) of the elevating body (90) at the raised end.

(109) is a hollow shaft pivotally supported by the slider (104), and supports the seesaw lever (106) by a support frame (110) fixed to the end face. The support frame (110) has grooves (111) on the upper and lower outer surfaces, and the central frame-shaped part (112) of the seesaw lever (106) is fitted into this groove (11).
The seesaw lever (106) is held so that it can slide along the groove (111). A screw shaft (113) is fixed in the frame-shaped part (112) in parallel with the sliding direction, and a nut (114) in the support frame (110) is screwed onto this screw shaft (113). . The nut (114) does not move relative to the support frame (110), and the screw shaft (113)
) and the thread pitch of the threaded shaft (103) are the same. The rotation axis (115) passing through the hollow shaft (109) rotates the nut (105>(114)). The zero rotation axis (115) is the axis of the electric Ja (116) attached to the slider (104). A gear (
11g) and bevel gear (119), and then
18) is a gear (12G) pivotally supported on the slider (104)
The bevel gears (119) are respectively engaged with bevel gears (121) integrally connected to the nut (114).

A bevel gear (122) is fixed to the gear (120), which is a bevel gear (123) fixed to the nut (105).
The number of teeth of gears (11g>(120) that mesh with
In each set of 3), the number of teeth in combination is the same. (1
24) is a rotary encoder connected to the electric motor (116).

The above device operates as follows. Figure 11 shows the behavior of the vacuum suction means (30) in the working stage (I > (El/ ) (V ) (Vl ). The vacuum suction means (30) that has arrived at the 0 work station (summer) (22) facing downward.At the time of arrival, the presser (45) is in the raised position, and the vacuum suction means (30) is in the raised position.
) does not generate suction force, where the elevating body (90)
descends and pushes down the slider (9), causing the suction nozzle (2
2) is pressed onto the part (52). This air cylinder (
44) lowers the presser (45) and pulp (40)
is opened, and the suction nozzle (22) suctions the part (52).The vacuum suction means (30) which has suctioned the part (52) rises as the elevating body (90) rises, and the suction nozzle (22) suctions the part (52). The actuator (43) of the moving pulp (40), which is carried by rotation from the working station (I) to (If), from (ff) to (fir), and from (■) to (IV), is pressed. It continues to be pushed by the plate (48), and the parts (
At the 0 work station (IV), where the suction of the part 52) is not interrupted, a posture determining device (63) checks the posture of the part (52). If the suction is completed in a normal posture as shown in Figure 11, the part (52) will not block the light beam of the photosensor, so it is determined that there is no problem. Vacuum suction after leaving the 0 work station (mV) The means (30) arrive at the work station <V>. At the time of arrival, the presser (47
) is in the lowered position, and the vacuum suction means (30) is at the part (5).
2) continues to be adsorbed. The vacuum suction means (30) descends, and at the point when the component (52) is pressed against the adhesive applied to the substrate (60), the presser (47) rises and the pulp (
40) to release the suction. Note that if the component (52) is attracted in an abnormal position, the vacuum suction means (30) does not descend at the work station ('/), and the presser (47) also remains lowered until it reaches the work station (1'V). >. Then, press the presser (47
) rises, the vacuum suction means (30) drops the part (52) into the parts collection box (62) and moves it to the work station (■).

The suction nozzle selection device f (70> installed at the work station <■> or ■) performs the following operation. That is, when the vacuum suction means (30) arrives at the station, the selector gear (74) selects the seventh As shown in the figure, it is located above the driven gear (21), and the tip of the lever (85) is inserted into the lever receiver (84).
) is engaged with the groove (83) as shown in FIG. 8, and firmly fixes the turret (20). Here, when it becomes necessary to change the suction nozzle (22) in use to another one, the elevator (71) descends as shown in Fig. 9 and engages the selector gear (74) with the driven gear (21). . When the elevator (71) lowers, the lever (85)
The lock bin (80) is also rotated to slide against the spring (82). This allows the lock pin (80) to move into the groove (8).
3), and the turret (20) becomes rotatable. In this state, the electric motor (75) is driven to rotate the angle turret (20) as much as necessary. When the elevator (71) is raised after changing the angle of the turret (20), the lever (85) returns to its old position and the lock bin (80)
) engages with the groove (83) again to lock the turret (20).

The elevating body (90) is moved by the vacuum suction means (3) by the force of the spring (95).
The seesaw lever (106) that connects the cam (97) and the elevating body 90) swings around the hollow shaft (109) as a fulcrum. However, the fulcrum position changes depending on the thickness of the part. Thin parts (52 mm) as shown in Figures 1 and 4
), the support frame (110) is placed in a position relatively close to the cam (97) with respect to the seesaw lever (106) so that the amplitude of the roller (108) becomes large. For this reason, the operating stroke of the elevating body (90) becomes large, and even though the part (52) is thin, the suction nozzle (22) cannot reach the upper surface of the part (52), or at the work station (V), the part (52) can be pressed onto the substrate (60) with appropriate pressure.

Next, when handling thick parts (52') as shown in Fig. 5, drive the electric motor (116) to tighten the nuts
is rotated to move the position of the support frame (110) closer to the elevating body (90) relative to the seesaw lever (106>. At this time, the nut (105) is also rotated and the number of teeth of each gear is changed. Due to the relationship between the ratio and the thread pitch of the screws (103) and (113), the slider (104) is attached to the support frame (11).
Move the seesaw lever (10) in the same direction and the same distance as 0).
6), therefore the cam (97)
and a seesaw lever (106) for the elevating body (90)
The relative position of the fulcrum remains the same, but only the fulcrum position can be raised and lowered (90)
As a result, the amplitude of the roller (108) becomes smaller, and the suction nozzle (<22) approaches the part (52') by taking advantage of the deceleration curve of the cam (97).
) will be pressed against the substrate (60).

If, for example, a pulse motor is used as the electric motor m (116), the stroke expansion and contraction of the elevating body (90) can be precisely numerically controlled. When the seesaw lever (106) swings, the electric motor (116) is left in a free rotation state. At this time, the nuts (105) (114> may rotate slightly due to vibrations, which may disturb the relative positions of the slider (104) and support frame (110) and the seesaw lever (106), so sometimes the rotary enhancer ( 124
) may disturb the rotational position of the electric motor (116), so check the rotational position of the electric motor (116) from time to time with the rotary encoder (124>) and calibrate the deviation.Please note that the operating stroke of the elevating body (90) If stroke expansion/contraction means (100) are provided at all work stations that require yA*, there is a risk of interference between the stroke expansion/contraction means, but this can be resolved by shifting the arrangement vertically. The means (100) does not necessarily have to be attached to all elevating bodies (90), as disclosed in JP-A-61-13519.
If it is possible to adopt a structure that reduces the impact on the parts by devising the support base, as exemplified in Japanese Patent No. 7, the work station can be omitted.

(G) Effects of the Invention According to the present invention, it is possible to expand and contract the vertical stroke applied to the vacuum suction means by the cam according to the thickness of the component, thereby maintaining the impact applied to the component below a certain level.

In addition, the stroke expansion/contraction means need only be placed at necessary work stations, without causing a significant increase in cost.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which FIG. 1 is a vertical sectional view, FIGS. 2 and 3 are a partially sectional top view and vertical sectional view of the stroke expansion and contraction means, and 4rXJ and 5 are the 1st view. 6 is a top view of the support means, FIG. 7 is a side view of the suction nozzle selection device, and FIG. 8 is a vacuum suction device related to FIG. 7. FIG. 9 is a top view of the means, similar to FIG. 7, and a side view of the suction nozzle selection device in a different operating state.
Figure 0 is a top view of the vacuum suction means related to Figure 9;
r! FIG. 3A is an explanatory diagram illustrating the behavior of the vacuum suction means in each work station in parallel. (52) (52')... Parts, (60)... Board,
50)...Component supply device, 1)...Supporting means,
(30)...Vacuum suction means, (90>...Elevating body,
(97)...Cam, (100)...Stroke expansion/contraction means.

Claims (1)

[Scope of Claims] 1) Supporting means that performs intermittent rotation in a fixed direction above the board on which components are to be mounted and the component supply device, and a peripheral edge of this supporting means so that each member can slide vertically relative to the supporting means. a plurality of vacuum suction means supported by the substrate and always maintained at a height apart from the substrate or the component supply device, and provided at least at a location corresponding to the component supply device and a location corresponding to the substrate. , a plurality of elevating bodies that lower each of the vacuum suction means to approach the target each time it reaches above the target, and a cam that moves the elevating bodies, wherein any elevating body and cam are provided. An electronic component mounting device characterized in that a stroke expansion/contraction means for expanding/contracting the operating stroke of the elevating body is disposed between the elevating body and the elevating body.