JPH0525767B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention allows workpieces such as strips and rods to be rotated 180°.
It relates to a workpiece rotation device that rotates a workpiece at a fixed angle such as 90°.

Conventional technology In manufacturing equipment that processes workpieces by flowing them through a single workpiece production line, the workpieces are rotated 180 degrees vertically or 90 degrees horizontally at a fixed position on the production line.
It may be rotated by degrees. This will be explained below with reference to FIGS. 9 and 10 using, for example, an example of equipment for a stamping process in the manufacture of semiconductor devices.

In the same figure, 1 is a workpiece, and there are a plurality of parts lined up at regular pitches on a strip lead frame 2.
After semiconductor pellet mounting and wire bonding, the package parts 3, 3, . . . are resin molded. Reference numeral 4 denotes a guide rail for transporting the workpiece 1, on which a plurality of workpieces 1 are intermittently fed in the longitudinal direction at a fixed pitch in the arrangement pitch of the package parts 3, 3..., and the package parts 3, 3... When it comes to package parts 3, 3..., the product name etc. is stamped on it. Reference numeral 5 denotes a work collection rail arranged horizontally perpendicular to one side of the fixed position of the guide rail 4. When one stamped work 1 on the guide rail 4 is carried into the position where the collection rail 5 is located, , this work 1 is fed from a guide rail 4 onto a collection rail 5 at a fixed pitch in the work width direction. Reference numerals 6, 6, . . . feed claws that intermittently feed the works 1, 1, etc. in the width direction on the collection rail 5 at fixed pitches, and 7, 7, for example, chain conveyors that support the feed claws 6, 6, . Assuming that the number of package parts 3, 3, etc. of one workpiece 1 is N, each time the workpiece 1 is fed by a fixed pitch N times on the guide rail 4, the workpiece 1 is fed once by a fixed pitch on the collection rail 5. The workpiece 1 is then turned over by 180 degrees on the collection rail 5, even if there is a time margin for feeding the workpiece on the collection rail 5, as will be described later. Reference numeral 8 indicates a frame-shaped magazine for storing workpieces with an opening at the top end, which is arranged near the tip of the collection rail 5, 9 is a support stand for the magazine 8, 10 is an elevator platform that ascends within the magazine 8 and then descends by a fixed pitch, and 11 indicates an elevating platform. , is an elevator mechanism that moves the elevator platform 10 up and down. The upper end of the magazine 8 is located at the height of the collection rail 5, and when the lifting platform 10 first rises to near this upper end opening and one workpiece 1 is supplied from the collection rail 5 into the upper end opening of the magazine 8. , this work 1 is a lifting platform 10
Then, the lifting table 10 is lowered by the thickness of the workpiece and waits for the next workpiece to be supplied. By repeating this operation, a plurality of works 1, 1...
are stored in a stacked state on a lifting table 10, and when the magazine 8 becomes full with works 1, 1, . . . it is taken out and the next empty magazine is supplied onto the support table 9 instead.

Workpieces 1, 1, etc., which have completed the above stamping process and are stored in the magazine 8, are then sent to post-processes such as a lead frame cutting process. There are cases where it is desired to process the workpiece with the stamped side facing down, and for such post-processing, the workpiece 1 may be turned upside down after stamping and before being stored in the magazine 8. This work reversal is performed at a fixed position on the collection rail 5 using a work reversing device 12 as shown in FIGS. 11 and 12, for example.

A pair of work reversing devices 12 are arranged on both sides of the collection rail 5, and only one of them is shown in the drawing. In this drawing, 13 is a swinging arm arranged parallel to one side of the collection rail 5, 14 is a rotation shaft connected to the rear end of the swinging arm 13, and the swinging arm 13 is moved up and down in a fixed position. 180° to
Rotate back and forth. 15 is a retractable chuck connected to the tip of the swinging arm 13; 16 is chuck 1;
A chuck opening/closing means for independently opening and closing the chuck 5 is fixed to the swing arm 13.

Initially, the swinging arm 13 is located at the solid line position in FIG. 12, and the chuck 15 at its tip is opened at the workpiece reversal fixed position _P1 of the collection rail 5.
When the workpiece 1 is fed by a fixed pitch on the collection rail 5 and carried into a fixed position _P1 , the chuck 15 closes and clamps the ends of the workpiece 1 from above and below. Next, the swing arm 13 moves in the direction of the arrow in FIG.
It rotates 180°, which causes workpiece 1 to change to chuck 15.
While being held there, it is turned 180° and fed onto the next fixed position _P2 on the collection rail 5. At this point, the chuck 15 opens and leaves the workpiece 1, and the swinging arm 13 rotates 180 degrees in the opposite direction and returns to the fixed position _P1 , waiting for the next workpiece reversal.

Problems to be Solved by the Invention The workpiece reversing device 12 may be mechanically simple, but in order to reverse one workpiece 1 by 180 degrees, two fixed positions are installed on the workpiece conveyance line, one before and one after the workpiece is reversed. Positions P ₁ and P ₂ are required, and since these two positions P ₁ and P ₂ are separated by a distance approximately twice the length of the swinging arm 13, it is necessary to rotate the work in the work transfer line. The problem was that it required a large space. In addition, the swing arm 13 reverses one workpiece 1 by a total of 360° rotational movement, including 180° reciprocating rotation, but this workpiece reversal action is to send the workpiece 1 onto the collection rail 5 at a relatively low index. However, it cannot be used in cases where the workpiece is fed at a high index.In other words, it is difficult for the workpiece reversing device described above to increase the index, and the range of application is narrowly restricted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a workpiece rotation device which has a simple mechanism and is capable of realizing workpiece rotation such as workpiece reversal in a narrower space, and which also enables a high index.

Means for Solving the Problems Technical means for achieving the above object of the present invention include a lifting block arranged to be movable up and down in a fixed position, and a first lift block rotatably pivotally connected to the lifting block.
a second rotary body pivotally connected to the lifting block so as to be rotatable at a predetermined rotation ratio by the rotational force of the first rotary body; and a second rotary body coaxial with the rotation axis of the second rotary body. a chuck that can be opened and closed to appropriately clamp a workpiece carried into a fixed position; a chuck opening/closing source that is fixed to the lifting block to open and close the chuck; and one end connected to the rotating shaft of the first rotary body. The other end of the swinging lever, to which is fixed, is reciprocated along a fixed arc trajectory in a direction orthogonal to the rotation axis of the first rotating body, and the first rotating body is reciprocated within a fixed angle range via the swinging lever. It is configured by a drive source that rotates and, in parallel with this rotation, moves the lifting block up and down via a first rotating body.

Operation With the above structure, the lifting block moves up and down once with each forward or backward movement of the swing lever, and during this period, one workpiece moves up and down in a fixed position and is rotated at a predetermined angle. Therefore, the workpiece is rotated by moving up and down at one fixed position on the conveyance line, and the space required for this workpiece rotation is small, and the workpiece rotation is performed by one movement of the swing lever. Since this is achieved by moving and reciprocating, it is possible to achieve a high index.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. Note that this example is based on the work 1 mentioned above.
180° vertically at a fixed position P on the collection rail 5.
Shows what is applied to the device for reversing.

In the embodiment shown in the drawings, reference numeral 18 denotes a fixed base disposed below the collection rail 5, and 19, 19 denote a fixed base 1.
A pair of elevating blocks are arranged vertically movably on 8, and each has a slide shaft 20, 20 protruding downward from the lower end, and a bearing 21, 20 fixed on a fixed base 18.
21 and is slidably inserted and supported. The pair of lifting blocks 19, 19 are opposed to each other, and their respective upper parts are opposed to each other on both sides of the work reversing position P of the collection rail 5. 22, 22 is lifting block 1
A rotating shaft 23 rotatably passing through the lower portions of 9 and 19.
A first rotating body coaxially fixed to both ends of the rotor, for example, a pair of large-diameter first pulleys. 24, 24 shown in FIG. 2 are lifting blocks 19, 1
A pair of small-diameter second pulleys, which are second rotary bodies, are rotatably pivotally mounted on the upper outer surface of the second pulley 9, and each is connected to the first pulley 22, 22 below it by an endless belt 25, 25. When the first pulleys 22, 22 rotate, the rotational force is transmitted to the second pulleys 24, 24 via the belts 25, 25, and the second pulleys 24, 24 are driven to rotate. 26, 26 are the second pulleys 2 on the upper inner surfaces of the lifting blocks 19, 19.
A pair of chucks that can be opened and closed are integrally fixed to rotating shafts 27 and 24, and both ends of the workpiece 1 at a fixed position P are appropriately held. 28,
Reference numeral 28 designates a chuck opening/closing source, such as a pair of first cylinders, fixed to the upper outer surface of the lifting blocks 19, 19 via support brackets 19', 19'.
Reference numeral 29 denotes a swing lever (hereinafter referred to as the first lever) whose one end is fixed to a part of the common rotating shaft 23 of the pair of first pulleys 22, 22 and extends in a direction perpendicular to the rotating shaft 23; The drive source is, for example, a second cylinder, which causes the other end of the first lever 29 to reciprocate below the rotation shaft 23 on a fixed arc trajectory in a direction orthogonal to the rotation shaft 23. A second lever 31 is parallel to the first lever 29 and has the same length, and one end thereof is connected to the rotating shaft 23.
The second end of the first lever 29 is rotatably attached to a support shaft 33 fixed to the lower surface of the fixed base 18 through an elongated hole 32 provided in a part of the fixed base 18 directly below the It is rotatably connected to the end of the cylinder 30 by a shaft 34 . The tip of a piston rod 35 of the second cylinder 30 is rotatably connected to this shaft 34. The rear end of the second cylinder 30 is rotatably connected to a pin 36 fixed on the fixed base 18, so that the second cylinder 30 is attached to be able to swing up and down about the pin 36 as a fulcrum.

Each unit of the pair of lifting blocks 19, 19 and their attachments is the same, and one unit will be described in detail with reference to FIGS. 4 to 6. Fourth
As shown in the figure, the radius r ₁ of the first pulley 22 at the bottom is twice the radius r ₂ of the second pulley 24 at the top, and when the first pulley 22 rotates 90 degrees, the second pulley 24 is rotated through the belt 25. 180° driven rotation. 2nd pulley 2
The rotary shaft 27 of No. 4 is pipe-shaped and rotatably passes through the lifting block 19 via a bearing 37 as shown in FIG. 5, and a chuck support frame 38 is integrally fixed to the tip of this rotary shaft 27. Ru. The chuck 26 is a pair of L-shaped chuck pieces 26a, 26.
Each chuck piece 26a, 26b is rotatably connected to the chuck support frame 38 by a support shaft 39, 39, and each chuck piece 26a, 26b is made of
A spring 40 is installed between the chuck pieces 26a and 6b to constantly pull the chuck pieces 26a and 26b in the closing direction. Also, the first cylinder 2 fixed to the lifting block 19
8, the piston rod 41 is inserted into the inner space of the pipe-shaped rotating shaft 27, and normally, as shown in FIG. to keep the chuck 24 open. This first
When the operation of the cylinder 28 is stopped, the chuck pieces 26a and 26b are closed by the tension spring force of the spring 40, as shown in FIG. 6, and the piston rod 41 is moved back. The chuck pieces 26a, 26b elastically clamp one end of the workpiece 1 from above and below by the tension spring force of the spring 40. In addition, in order to ensure that this workpiece clamping is performed without damaging the workpiece side,
For example, rubber plates 42, 42 are fixed to the inner surface of the tip end of each chuck piece 26a, 26b.

Next, the work reversing operation according to the above embodiment will be explained.

On both sides of the work reversing position P of the collection rail 5, the pair of lifting blocks 19, 19 face each other at the lower limit position, and at this time, the pair of chucks 26, 26 are held open above and below the work conveyance path. In this state, one workpiece 1 is placed in the workpiece reversal position P.
When the is carried in, first a pair of chucks 26,
are closed by independent operation of the first cylinders 28, 28, and both ends of the workpiece 1 are clamped. Next, if the first and second levers 29 and 31 are inclined at an angle of 45° toward the second cylinder 30 as shown by the solid line in FIG. 3, the second cylinder 30 moves its piston rod 35 forward. let Then, since the lower end of the second lever 31 is connected to the fixed support shaft 33, the second lever 31 rotates upward about the support shaft 33 in response to the forward movement of the piston rod 35, and at the same time the lower end of the first lever 29 The first pulleys 22, 22 also rotate upward, raising the lifting blocks 19, 19 via the rotating shafts 23 of the first pulleys 22, 22. At the same time, since the first lever 29 is fixed to the rotating shaft 23, the rotating shaft 23 is rotated, thereby causing the first pulley 2
2 and 22 rotate. Then, as shown in FIG. 7, when the first and second levers 29 and 31 have rotated 45 degrees, the first and second levers 29 and 31 are aligned in a straight line, and the lifting blocks 19 and 19 are moved to the uppermost position. Rise. During this rise, the first pulleys 22, 2
2 is rotated by 45 degrees, and therefore the second pulleys 24, 24 are rotated by 90 degrees via the belts 25, 25, and each chuck 26, 26 is also rotated by 90 degrees. With this series of movements, the workpiece 1 on the collection rail 5 becomes chuck 2.
It is lifted from the recovery rail 5 while being held between the rollers 6 and 26 and rotated 90 degrees.

When the piston rod 35 is further advanced by the second cylinder 30, the first and second levers 29, 31 begin to bend in the opposite direction from their straight positions, and the lifting blocks 19, 19 therefore begin to descend. However, the first
The rotation of the pulleys 22, 22 continues through more than 45°, so that the workpiece 1 continues to descend and rotate through more than 90°. Then, as shown in FIG. 8, when the first and second levers 29 and 31 have further rotated 45 degrees from the straight position, the piston rod 35 stops moving forward.
The lifting blocks 19, 19 are lowered to the original lower limit position, during which time the first pulleys 22, 22 are further rotated 45 degrees from the upper limit position, and the second pulleys 24, 24 are further rotated 90 degrees from the upper limit position. Therefore, workpiece 1 rotates 90 degrees when ascending, and further rotates 90 degrees when descending.
As a result, the work is rotated 180° and returned to the original work reversal position P on the recovery rail 5.

Next, the chucks 26, 26 are opened and separated from the workpiece 1, and the workpiece 1, which has been reversed by 180 degrees, is sent to the next position. Then, when a new workpiece 1 is carried into the workpiece reversal position P, the chucks 26, 2
6 closes and holds a new work 1. At this time, the first and second levers 29 and 31 are in the position shown by the solid line in FIG.
19 starts to rise, the first pulleys 22, 2
2 starts rotating in the opposite direction. Therefore, the new workpiece 1 is reversed only in the direction of rotation to the workpiece reversing operation described above, and is reversed by 180° by raising and lowering at the same time, and is returned to the original workpiece reversing position P.

Note that the workpiece to be rotated by the apparatus of the present invention is not limited to a belt-shaped object such as a lead frame, and the rotation angle of the workpiece is not limited to 180° but can be set arbitrarily. For example, when rotating a bar-shaped workpiece by 90 degrees using the above device, the second pulley 2 rotates by 90 degrees of rotation of the first pulleys 22 and 22.
This can be easily achieved by setting the pulley diameter so that both 4 and 24 rotate by the same 90°.

Further, the present invention is not limited to the structure of the above embodiment, and for example, pulleys are used for the first and second rotating bodies, but gears or the like may be used if pulleys are not suitable.

Effects of the Invention According to the present invention, the workpiece is raised in a fixed position.
Since it is lowered, rotated by a predetermined angle, and returned to its original fixed position, the space occupied by the workpiece rotating device in a workpiece conveyance line or the like can be reduced, and extremely effective workpiece manufacturing equipment can be provided. Also, the rise in the fixed position of the workpiece,
A series of lowering and rotation operations are performed by only one swing of the swing lever connected to the first rotating body,
When the swing lever is returned to its original position, the next workpiece can be rotated, thereby improving the index.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a work rotation device showing an embodiment of the present invention, Fig. 2 is a front view taken along line A-A in Fig. 1, and Fig. 3 is a view taken along line B-B in Fig. 2. 4 is an enlarged sectional view taken along line C-C in FIG. 2; FIGS. 5 and 6 are enlarged sectional views of a part of the device shown in FIG. 7 and 8 are cross-sectional views of the device in FIG. 3 in various operating states. 9 and 10 are a plan view and a front view showing an example of work manufacturing equipment, FIG. 11 is a partial plan view of a conventional work reversing device applied to the equipment shown in FIG. 9, and FIG. FIG. 2 is a sectional view taken along line DD of FIG. 1... Work, 19... Lifting block, 22...
...first rotating body [pulley], 23... rotating shaft of first rotating body, 24... second rotating body [pulley],
26...Chuck, 27...Rotating shaft of second rotating body, 28...Chuck opening/closing source [cylinder], 29
... Swinging lever, 30 ... Drive source [cylinder].

Claims (1)

[Claims] 1. A lifting block arranged to be movable up and down in a fixed position, a first rotating body rotatably pivotally connected to the lifting block, and a predetermined rotational force applied to the lifting block by the rotational force of the first rotating body. a second rotary body pivotally mounted to be rotatable at a rotation ratio; an openable/closable chuck that is coaxially connected to the rotating shaft of the second rotary body and appropriately clamps a workpiece carried into a fixed position; A chuck opening/closing source fixed to the lifting block to open and close the chuck, and a swing lever having one end fixed to the rotating shaft of the first rotating body, the other end of which is perpendicular to the rotating shaft of the first rotating body. The first rotary body is reciprocated on a fixed circular arc trajectory in the direction of rotation, and the first rotating body is reciprocated within a fixed angle range via the swing lever, and in parallel with this rotation, the lifting block is moved up and down via the first rotating body. A work rotation device characterized by comprising a drive source.