JPS6194400A - Chucking mechanism of head section of automatic chip mounting machine - 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: ■)... Various electronic component chips (hereinafter referred to as chips) that have been supplied to fixed positions by appropriate means depending on the industrial application field, conventional technology, and their problems are mounted on an automatic chip mount machine. (
Various devices are used that pick up individual pieces using a chuck on the head (pink knob type) and mount them one after another at fixed positions on a printed circuit board at high speed (in seconds).

The above-mentioned head section with a chip chucking function chucks each chip supplied to a set position, and then moves back and forth and left and right according to the program by driving a servo motor, etc., and the chucking section and the chip The vacuum pit section moves up and down and rotates to transport and mount the chip to a predetermined position on the printed circuit board. In addition, for example, adhesive is applied in advance to a predetermined position on the printed circuit board, and the mounted chips are temporarily held, and the printed circuit board that has been mounted with a large number of chips is passed through the solder bath. The process is to formally connect the chips and finish the chip mounting.

Accordingly, the present invention relates to an improvement of the chuck mechanism in the head section.

(11)・Prior art and its problems To give an overview of an example of a conventional chuck mechanism, (
(Figure 6) The head section is controlled and driven in the front-rear, left-right directions by servo motors, etc. It consists of an approximately 15 cm cubic body.
It is suspended on a servo, drive shaft, and a pipe-shaped suction bit 3 is installed vertically on a part of the machine body L so as to be able to move up and down a fixed distance. The suction bit 3 is installed so that it can be inserted freely, and the suction bit 3 is installed at its tip to suction one chip C (vanokeem), and the short cylindrical bracket fixed to the lower part of the spindle is
Along the circumference of the lower surface, four chuck pieces 6' having cam protrusions S on the inner side of the center part are pivotally suspended at equal intervals (every 90 degrees), and each chuck piece 6' Outside the center (
The spring 7 is wound around the inside, and the tips 6'' of each chuck piece 6' curved inward face each other so that the left and right, front and rear 2
A chuck 6 is formed by combining the pair 7, and a truncated cone-shaped taper cam groove and a disc are provided at the lower part of the short cylindrical body at a position surrounded by the four chuck pieces 6' of the spindle unit. Part q (slit IO into which the chuck piece 6' is loosely inserted)
A cam sleeve I/ having a cut shape) is slidably inserted thereinto, and a spring 13 is stretched between the lower surface of the cam sleeve I/ and a ring plate )/2 fixed to the spin torque. Furthermore, the disk portion 9 of the cam sleeve // is placed on the circular rail lt [7], and the circular rail 7 is moved up and down by a certain distance by an appropriate means, so that the cam sleeve // is placed on the circular rail lt. The spindle unit is arranged to move up and down by a fixed distance, and the spindle unit, cam sleeve II, and chuck B are all rotated on the circular rail/IA by the rotational drive of the spindle unit.

Therefore, to explain the effect of the above configuration, (1')
...Initially, the circular rail/4C was raised and the cam sleeve/
When / is raised, the taper cam contacts the cam protrusion S of the chuck piece 6', and each chuck.

The strip 6' is pushed open in four directions against the centripetal contraction force of the zipper 7 (chuck open).

(2) Adjust the head section to the chip C supply position, lower the spindle unit and suction pit 3 to suction the chip C, and then raise and restore the suction bit.

(3)...Next, when the circular rail /≠ is lowered, the cam sleeve l/ is lowered, so that the contact position between the cam protrusion 6'' and the taper cam slides to the lower side of the taper surface,
When each chuck piece begins to close, the tip C held on the suction bit 3 is clamped (chucked) by the tip 6''.

(4)...When the chip C is chucked, the head part is adjusted and moved to a predetermined position on the printed circuit board and stopped, the spindle unit is rotated to align the direction of the chip C, the spindle unit is then lowered, and the head part is moved to a predetermined position on the printed circuit board and stopped. 6 and mount the chip C onto the printed circuit board.

(5)...Thus, the actions in (1) to (4) above are performed at a high speed of seconds, and by repeating this at high speed, a large number of chips are placed one after another in a predetermined position on a printed circuit board. It is something to mount.

However, the conventional chuck mechanism described above has the following drawbacks.

(A) to (E) in FIG. 7 are schematic diagrams illustrating the operation of the conventional channing mechanism described above.

When the cam sleeve/l is raised in the states (1) and (a), the cam projections s of each chuck piece 6' come into contact with the tapered cam grooves, and the four chuck pieces 6' are evenly pushed open (
zipper open).

(2)...Also, in the state (b), the cam sleeve/
/ is completely lowered, the cam protrusion S completely slides down the tapered cam groove, and the tips 6'' of the four chuck pieces 6' face the center and are evenly closed (chuck closed).

(3)...Thus, in (c), while the cam sleeve/l is descending, the cam protrusion S begins to slide down the tapered cam surface, and the four chuck pieces 6' begin to close. This is a state in which a chip C is being held in the middle of the process, but the chip C is usually rectangular in most cases. In addition, when the suction bit 3 adsorbs the supplied chip C, since the chip C is extremely small and lightweight,
Since it is not always supplied to an accurate position and picked up in an accurate posture, it is often chucked at a misaligned 14 seconds as shown in (e), for example.

Therefore, when the chuck pieces 6' chuck the chip C in the above order of action, the pair of left and right chuck pieces 6' chuck, for example, the left and right short sides of the chip C first.

However, since the taper cam g surface (g surface) is conical and the circumferential surface that each cam protrusion S contacts is completely uniform, the cam protrusion S of the other pair of front and rear chuck pieces is in contact with the taper cam g surface. Even if the tip 6″ is at that position, the tip C
It does not reach the front and rear long sides of the paper, resulting in a messy state.

Therefore, the centripetal contraction force of the sufring 7 acts only on the left and right pair of chuck tips 6'' as a clamping stress, and does not act on the front and rear pair of chucks. Even with the chucks, the drawback was that only one pair was actually useful.

In addition, since only one pair of chucks is effective, even if the chip C is chucked with a misalignment as in (e) above, the other pair of chucks has a function to correct it. No, therefore, positional deviation (inaccurate position)
Noma 5 has the disadvantage that it is mounted at an inaccurate position on the printed circuit board, and furthermore, the chuck only holds part of the fragile and delicate chip C (for example, the left and right short sides or a part thereof). Therefore, a strong clamping stress acts only on that part, resulting in an adverse effect.As a result, it is difficult to adjust the contraction force of the spring 7, and in view of the above disadvantages, if the spring force is made too weak, it is difficult to adjust the contraction force of the spring 7. However, there are drawbacks such as reduced chucking performance, and solutions to these problems have been a challenge.

■)...Structure, function, and effect of the present invention (1)...Structure The present invention is intended to solve the above-mentioned conventional problems, and the cam sleeve portion, especially its tapered cam portion, is divided into two parts. The cam projections of each pair of chuck pieces are in contact with each different taper cam, thereby,
Each pair of chuck pieces are separated according to the shape of the chip C (
(It is characterized by having a chucking effect.

That is, to explain the configuration of the present invention with reference to its embodiment (FIG. 1), it consists of a head part that is controlled to move 4% in the front and back and left and right directions by a servo motor, etc., and a body of approximately 15t7n cubic size.
It is suspended on a servo drive shaft, and a pipe-shaped suction bit 3 is fixed on a hollow spindle 2, which is installed vertically on a part of the machine body 1 and can move vertically. Dimensions are vertically movable and inserted through the suction bit Ji.
j It is provided to vacuum a single chip C at its tip, and a cam protrusion S is placed inside the center along the circumference of the lower surface of the short cylindrical plaque fixed to the lower part of spindle 2. Yes 4
The book chuck pieces 6' are pivoted at equal intervals (every 9 o'clock) so as to be able to swing freely, and a spring 7 is applied to the outside of the approximate center of each chuck piece 6', and the spring 7 is bent inward. The tip of each chuck piece 6' // faces each other and forms two pairs of left and right, front and back, forming a chuck b, which is surrounded by four chuck pieces 6', the shaft and the spindle. At the lower part of the short cylindrical body, there is a truncated conical tapered cam groove and a disc part 9 (a slit 10 into which the chuck piece 6' is loosely inserted).
A cam sleeve /l with a cutout) is slidably inserted, and a spring 13 is inserted between the lower surface of the cam sleeve /l and a ring plate l:l fixed to the spindle 2.
Further, by placing the disc portion 9 of the cam sleeve // on the circular rail lψ and moving the circular rail lψ up and down by a certain distance by an appropriate means, the cam sleeve ll is fixed. It is provided to move up and down in dimensions, and is configured so that by rotationally driving the spindle 2, the spindle 2, the cam 1j-p//, and the chuck 2 all rotate on the circular rail l≠. In the head-mounting mechanism of an automatic chip mount machine, an upper cam sleeve has a triangular plate 16 with a tapered cam on each side hanging from the lower surface of the short cylindrical part /3a.
and a truncated conical taper cam gb and a disc part q (loosely inserting the chuck piece 6') below the short cylindrical part isb.
/ 0 cut) is extended, and the triangular plate 16 of the upper cam sleeve l/a is extended to the short cylindrical part /Sb and the tapered cam b.
．． A lower cam sleeve //b is provided with slits /'l, /'l cut into which the lower cam sleeve //b is slidably fitted, and the upper cam is inserted into the slits /'7, /'7 of the lower cam sleeve //b. The triangular plates 16, 16 of the sleeve //a are fitted to form a cam I-buttN whose parts are the taper cam lra and the taper cam gb, and the cam sleeve // is attached to the spindle 2, and its Te/S cam ga is fitted. is fitted and installed in such a manner that it faces the left and right pair of chuck pieces 6', and the taper cam gb faces the front and rear pair of chuck pieces 6', and the ring plate 12 fixed to the spindle 2 and the upper and lower cam sleeves/ Spring between /a and //b /3
a and /3b are tensioned separately, and the centripetal contraction force of the spring 7, which is wound around the outside of each chuck piece 6', is made more than 15 times stronger than that of the conventional one.

(11)...Function The function of the present invention will be explained in particular with respect to the function of the taper cam ga1rb of the cam sleeve //a%//b, which is the gist of the present invention ((a) to (ho) in Fig. 3). )), (1)...In the state of (a), the cam sleeve // (i.e., consisting of upper and lower cam sleeves //a, //b)
, the cam protrusions S of the pair of left and right chuck pieces 6'
is pressed against the taper cam lra, and the cam protrusions S of the pair of front and rear chuck pieces 6' are pressed against the taper cam gb, and the four chuck pieces are evenly pushed open (chuck open).

(2)...In the state of (a), the cam sleeve /l is completely lowered, each cam protrusion S completely slides down the taper cam ga%gb, and each tip 6'' is oriented toward the center and closed evenly. (zipper closed).

(3)...Then, in (7~), the circular rail/4I
- while lowering the cam sleeve ll, i.e.
As each cam protrusion S begins to slide down the taper cams a and gblm and the tip 6'' begins to close, the cam protrusion S first contacts the taper cam fa of the upper cam sleeve //a. A pair of left and right chuck pieces 6' chuck the left and right short sides of the rectangular chip C, and the upper cam sleeve //a remains in that position.

Subsequently, when the cam sleeve // is lowered, the lower cam sleeve //b is further lowered, and the pair of front and rear chuck pieces 6' that are in contact with the tapered cam gb further proceed to close the chip C. Chuck the front and rear long sides.

That is, in the present invention, the centripetal contraction force of the spring 7 is made more than 1.5 times stronger than the conventional one, and the taper cam portions are formed separately so as to face the left and right, front and rear hook chuck pieces. As a result, the cam protrusion 5 of each chuck piece 6' is always in a state of strong pressure contact with the circumferential surface of the cam sleeve l/, and therefore operates in strict accordance with the change in the shape of the outer circumferential surface of the cam sleeve l//.

Therefore, initially, the pair of left and right chuck pieces b' are at the position where they chuck the chip c, that is, the taper cam ga is slid on the taper cam ga surface by the strong pressing force of the cam protrusion 5 caused by the strong contracting force of the spring 7. When descends at position 1,
The chuck piece 6' is tightened by the spring force and clamps the left and right short sides of the chip C, and the taper cam ga is stopped at that position partly due to the action of the spring 70.
Since the strong contraction force is still pressed against the taper cam gb through the cam protrusion S of the front and rear pair of chuck pieces 6', the taper cam gb is still pushed down, and therefore, the front and rear pair of chuck pieces 6' move to close. , and stop by holding the front and rear long sides of the chip C.

Therefore, chip C has four chuck pieces 6' on its four sides.
Since the centripetal contraction force of the spring 7 acts evenly, the chuck is performed at an accurate position with uniform stress.

(11 ()...Effect (1)...According to Kimi Kozuki, the chuck mechanism of the present invention: the four chuck pieces clamp the four sides of the chip C with uniform stress. Therefore, the chuck state of the chip C is extremely accurate, strong (and stable), and unlike the conventional chuck state, strong stress is not applied unevenly to a part of the chip, and the chuck state is extremely accurate and stable. Since it is distributed and applied evenly, there is no risk of adversely affecting the chip C even if a strong spring 7 is used. Therefore, it is possible to use a sufficiently strong spring 7, which improves the chucking performance. It can be improved even more.

(2) ...Also, since the spring 7 applies a strong centripetal contraction force of 40,000 yen to the tip of the chuck, for example, as shown in Fig. 3 (e), initially a pair of left and right chucks Even if a piece chucks chip C incorrectly,
The subsequent chucking by the pair of front and rear chuck pieces performs the action of moving and correcting the chip C at the center position (the center of the tips of the four chuck pieces), so that the chip C can always be chucked at an accurate fixed position. Therefore, it can exhibit an excellent feature that it can be mounted at a precise position on the print substrate i.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the chuck mechanism of the present invention, Fig. 2 is a sectional view taken along the line A-A', Fig. 3 is a front view, top view and bottom view of the upper cam sleeve, and Fig. Fig. 5 is a partially cutaway front view and plan view of the lower cam sleeve, and Fig. 6 is a cutaway (E) of an example of a conventional chuck mechanism, and Fig. 4 is a schematic illustration of the operation of the conventional example. % l...Aircraft, U...Spindle,
3... Suction bit, ψ... Bracket, S... Cam protrusion, 6... Chuck, 6'... Chuck piece, 6〃
...Tip, 7...Spring, glgalgb...
・Taper cam, 9...disc part, IO・slit, /l
...Cam sleeve, //a... Upper cam sleeve, /
/b...Lower cam sleeve, 13...Spring, l
ψ...Circular rail, /5a11 /! ;b-short cylinder part, /
4--Triangular sip. l7... Surinote.

Claims (1)

[Claims] 1) In a chuck mechanism that is part of the structure of the head of an automatic chip mount machine, that is, in a part of the body of the head, a spindle equipped with a pipe-shaped suction bit is installed vertically and It is installed so that it can move up and down a fixed dimension by appropriate means,
A pair of left and right, front and rear chuck pieces are pivotally attached to a bracket fixed to the spindle, and each chuck piece has a cam projection on the inside and a spring is wound around the outside,
A cam sleeve having a tapered cam portion is fitted in a position surrounded by each chuck piece of the spindle so as to be slidable up and down.
A chuck mechanism comprising a spring tensioned between the cam sleeve and the ring plate, and a circular rail on which the cam sleeve is placed and which is moved up and down by a certain distance by an appropriate means to move the cam sleeve up and down. In this method, the tapered cam portion of the cam sleeve that is fitted into the spindle so as to be slidable up and down is provided with a pair of left and right taper cams for pressure contacting one chuck, and a pair of front and rear tapered cams for pressure contacting one chuck. The springs on the ring plate are tensioned separately for each of the taper cams, and the centripetal contraction force of the springs wrapped around the outside of each chuck piece is much stronger than before. A chuck mechanism for the head of an automatic chip mount machine, which is characterized by: