KR20010021709A - Press device for processing lead frames - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a press apparatus for lead frame processing, said press apparatus comprising: a frame (2), at least one ram component (3) mounted displaceably on the frame (2) and a ram component (3) of the frame (2). Drive means connected to the ram component for displacing the drive element, the drive means being mounted to the subframe 13, and the subframe 13 is displaceably connected to the frame 2.

Description

PRESS DEVICE FOR PROCESSING LEAD FRAMES}

The press apparatus according to the known art has a ram part, which ram part can constitute an operating stroke. During the operation stroke, for the positioning of new products for removal of the machined and / or processed product, relatively limited openings are arranged between the separated tool parts. For maintenance, conversion and maintenance it is desirable to be able to move the tool parts at further distances. Such relatively large openings constructed between tool parts are referred to as "daylight openings". In order to construct the daylight opening, the press device according to the known art is provided with connecting means having an adjustable length, said connecting means connecting the displaceable ram component to the drive means. The connecting means is formed by a crank and accommodates a spindle structure in which a spindle drive is coupled to the crank. To construct the daylight opening, the crank is extended using a spindle drive. The disadvantage of the structure is that force is transmitted through the spindle structure from the drive means to the movable ram part. The spindle structure thus constitutes a relatively heavy shape but is still an important part of the press apparatus. Another disadvantage is the relatively complicated structure of the crank.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press device for lead frame processing.

- frame,

One or more ram parts displaceably mounted to the frame and

Consists of drive means connected to the ram component for displacing the ram component of the frame.

1 is a perspective view of a press apparatus according to the invention in a closed position;

2 is a perspective view of the press apparatus of FIG. 1 in an open operating position.

3 is a perspective view of the press apparatus of FIGS. 1 and 2 in the open daylight position.

4 is a rear perspective view of the press apparatus shown in FIGS. 1-3 in the closed position;

5 is a cross sectional view through the bottom of the press apparatus shown in FIGS. 1-4 in a closed position;

6 is a perspective view of another press device in the open operating position.

FIG. 7 is a perspective view of the press device of FIG. 6 viewed from the other side. FIG.

8 is a perspective view of the press apparatus of FIGS. 6 and 7 in a daylight position.

9 shows a schematic view of the part of the press apparatus according to FIGS. 6-8 in an open position;

10 is a schematic view corresponding to FIG. 9 in a daylight position.

* Sign Description

1,20 ... press unit 2,21 ... frame

3,22 ... ram parts 4,5,23,24 ... tool parts

6 ... 7,25 yoke

8,26 ... crank 9,31 ... eccentric shaft

10 ... Belt 11,29.Motor

12 ... pulley 13, 27 ... subframe

14,35 ... Axle shaft 15,28 ... Cylinder cylinder

16,33 ... Lock 17,32 ... Lock cylinder

18 ... Lock guide 19 ... Subframe beam

30 ... Transmission 34 ... Block

It is an object of the present invention to provide an improved press apparatus of the type mentioned in the introduction, in which the daylight opening can be constructed without using a relatively sensitive crank structure in which the spindle is accommodated.

The present invention provides the press apparatus for this purpose, the drive means being mounted in a sub-frame, the subframe being displaceably connected to the frame. In a preferred embodiment, the subframe is pivotally connected to the frame. It is also preferred that drive means, for example drive cylinders, be arranged between the subframe and the frame. In order to displace the ram part so that the daylight opening can be constructed, the subframe must be displaced in the press apparatus according to the invention. This is possible, for example, by pivotally configuring the subframe and by pivoting the subframe to form a daylight opening. It is also possible to construct the subframe in a linearly translatable shape. For automatic displacement of the subframe, the drive means must be arranged between the subframe and the frame. Operation of the drive means results in displacement of the subframe. The low cost solution to the drive means is formed by a drive cylinder. It can be configured to be relatively compact.

The advantage of the device according to the invention is that, besides not using a relatively expensive and fragile crank structure, the weight of the press parts which are movable during normal operation is limited. The equipment for constructing the daylight opening, in particular the subframe and the drive means for the subframe, is stopped in either case during the execution of the normal operating stroke. Reduction in weight and reduction in size for movable parts present several advantages, such as low energy consumption, faster start and stop selection, limiting noise generation, and the like.

Another advantage is that the switching of the press apparatus from the operating position to the daylight position (and vice versa) can be made faster by the press apparatus according to the invention compared to the press apparatus according to the known art. Replacement of the cranks can also be made faster and easier.

In a preferred embodiment, the frame is provided with one or more stops, the subframe is provided with one or more counter stops, the counter stops co-operating with the stops of the frame for precise positioning of the subframe at a position determined relative to the frame. Works. At least the stop or counter stop can be configured for displacement between the operating position and the non-operating position. It is particularly important to be able to position the subframe accurately with respect to the frame, especially at the position of the subframe, and the press apparatus is set to perform an operating stroke. Accurate positioning of the subframe requires control of the extreme position of the tool during the operating stroke. By positioning the subframe by the stop, accurate positioning can be ensured with a relatively low cost structure. When at least one stop is displaceable, it is also possible to use the stop as a locking element. Therefore, it is possible to prevent the subframe from being displaced when the subframe is to be positioned at an accurately determined end position. Another advantage of the displaceable stop is that when the stop is positioned in the operating position, the force on the stop in the direction of movement can be provided to the subframe.

In a preferred embodiment, the drive means for displacing the subframe also generates a bias for providing a force to the opposite stop of the subframe relative to the stop of the frame. The drive means thus help control the position of the subframe at the determined position. When the stop is displaceable, it is possible for the drive means to apply a biasing force in the direction of movement of the subframe. This makes it possible for the drive means for the subframe to generate the deflection in a certain direction, in which said deflection can be applied relatively simply. Therefore, it is possible to satisfy with a relatively inexpensive driving means for the subframe.

In a preferred embodiment, the drive means for displacing the ram component is formed by a rotatable eccentric shaft and a drive motor connected to the eccentric shaft. The drive motor may be directly connected to the eccentric shaft or may be connected to the eccentric shaft via connecting means, for example a drive belt. All of these elements can be assembled to the subframe in a relatively simple manner.

The invention will be explained in more detail with reference to the non-limiting examples shown in the following figures.

1 shows a press apparatus having a frame 2, with which the ram part 3 is displaceable vertically with respect to the frame 2. Two tool parts 4, 5 are mounted between the ram part 3 and the top of the frame 2, which are connected to each other in the position shown. For vertical movement of the ram part 3, the ram part 3 is connected to a guide rod 6. The yoke 7 is connected to the guide rod 6 on the side of the rod 6 away from the ram component 3. The yoke 7 is vertically displaceable, since the two cranks 8 are connected to the rotatable eccentric shaft 9. The crank 8 is pivotally connected to the yoke 7 and the eccentric shaft 9.

In order to generate the rotation of the eccentric shaft 9, the eccentric shaft 9 is connected to the motor 11 via a belt 10 in which it is configured. The belt 10 in which it is configured is connected to a belt pulley connected to the eccentric shaft 9 on one side and extends above the pulley 12 on the other side.

The drive means of the crank 8 (that is, the assembly of the eccentric shaft 9, the belt 10, the pulley 12 and the motor 11 configured therefrom) are mounted to the subframe 13. The subframe 13 is connected to the frame 2 for pivoting about the axis 14. The position of the subframe 13 can be changed by the working cylinder 15. In the position shown, the subframe 13 is located in the operating position, and the position of the subframe is fixed by a lock 16. The lock 16 is mounted to the frame 2 via a lock cylinder 17. In addition, a locking guide 18 having a recess is mounted to the frame 2, through which the locking device 16 is movable in a loose fit. When the lock 16 is retracted, space remains between the two cooperating lock guides 18 for the passage of the subframe beam 19.

In FIG. 1, the subframe beam 19 is constructed under the lock 16. For accurate positioning of the subframe 13 and the upper tool part 4, a force on the locking device 16 is provided by the cylinder 15 to the subframe beam 19. The lock 16 supports the lock guide 18 at the top.

In FIG. 2 the tool parts 4, 5 are configured spaced apart from one another, since the eccentric shaft 9 is displaced with respect to the position shown in FIG. 1. The crank 8 is located in a higher position, by which also the yoke 7, the guide rod 6 and the ram part 3 are located further upwards. The position of the subframe 13 shown in FIG. 2 coincides with the position shown in FIG.

3 shows a press apparatus 1, which is configured at a position where the tool parts 4, 5 are moved at a further distance than in FIG. 2. The location shown is also referred to as a daylight location. In this position, repairs can be made and the tool parts 4 and 5 can be replaced with other tool parts. This position is different from the "normal" operating position.

In the position according to FIG. 3, the position of the subframe 13 is changed. In the positions shown in FIGS. 1 and 2, the lock 16 is first moved to the unlocked position. For a simple displacement of the lock 16, the upward deflection of the cylinder 15 is first released for this purpose. After the space between the two cooperating locking guides 18 is left empty, the subframe 13 can be inclined around the axis of rotation 14 by the cylinder 15. The subframe beam 19 is moved between the cooperating locking guides 18.

In order to prevent the subframe 13 from retracting in an undesired manner, after the subframe beam 19 passes, the lock 16 can be moved back to the starting position shown in FIG. 1. This is shown in FIG. 3. Thus, the subframe beam 19 is blocked at the bottom by the locking device 16.

The eccentric shaft 9 is displaced upward by displacing the subframe 13. The displacement of the eccentric shaft 9 is transmitted to the ram component 3 via the crank 8, the yoke 7 and the guide rod 6. The desired daylight opening is thus obtained.

In order to better observe the connection between the frame 2 and the subframe 13, the press device 1 is shown in a different direction in FIG. 4, which corresponds to FIG. 1. It can be clearly seen that the rotating shaft 14 connects the frame 2 and the subframe 13.

FIG. 5 shows a sectional view through the lower side of the press apparatus 1 shown in FIGS. 1-4, along the position of FIG. 1. The structure of the locking guide 18 forming the part of the frame 2 is particularly clearly shown. The lock 16 extended by the lock cylinder 17 blocks the subframe 13 in its lower position. By applying a force having the direction of arrow P1 to the subframe 13 with the cylinder 15, the subframe 13 attempts to rotate about the axis 14. The subframe beam 19 exerts a force in the direction of the arrow P2 on the lock 16. The beam 19 provides the locking device 16 with a force against the locking guide 18. Thus, accurate positioning of the subframe 13 is achieved.

6 shows a press device 20, in which the frame 21, ram parts 22, tool parts 23 and 24, yoke 25 and crank 26 correspond to parts of the press device 1. . The structure of the plate-shaped subframe 27 is different. A working cylinder 28 is configured behind the figure. Only one of the actuating cylinders 28 is partially shown in the figure. Similar to the movable subframe 13, the subframe 27 is pivotable in the frame 21 by an actuating cylinder 28.

A partially visible motor 29 is configured at the bottom of the subframe 27, which is connected to a rotatable eccentric shaft 31 via a reduction gearbox 30. The assembly of the motor 29, the transmission 30 and the eccentric shaft 31 are relatively small when compared to the corresponding parts of the press apparatus 1.

Two locking cylinders 32 actuate two horizontally displaceable locking devices 33. In the position shown in FIG. 6, the lock 33 is extended and a force on the bottom of the lock 33 is provided by an actuating cylinder 28 on top of the subframe 27. Therefore, accurate positioning of the subframe 27 is ensured.

FIG. 7 shows a press apparatus 20 constructed in the position of FIG. 6 viewed from the opposite side. The working cylinder 28 and the rotary shaft 35 are clearly shown and are configured such that the subframe 27 can pivot on the frame 21 by the rotary shaft 35.

8 shows the press apparatus 20 in the daylight position, with the tool parts 23 and 24 being moved relatively far apart. For this purpose, after the locking device is first retracted, the subframe 27 is pivoted by the actuating cylinder 28. In order to fix the daylight position, after the inclined daylight position of the subframe 27 is reached, the locking device 33 is moved back to the starting position according to FIG. 6. Block 34 is configured under the subframe 27 so that the subframe 27 cannot be pivoted to a more horizontal position.

9 and 10 show subframes 27 configured in the operating position and the daylight position, respectively. In FIG. 9, the upper part is configured for the lower part of the locking device 33, because the cylinder 28 exerts downward force on the subframe 27.

In FIG. 10, the pivoted position of the subframe 27 is fixed by an elongated lock 33 which protrudes to a position below the block 34.

Claims (8)

- frame, At least one ram part displaceably mounted to the frame, and A press device for lead frame machining, comprising a drive means connected to a ram part for displacing the ram part of the frame, The driving means is mounted to the subframe, the subframe is connected to the frame displaceably press apparatus for processing the lead frame. The press apparatus as claimed in claim 1, wherein the subframe is pivotally connected to the frame. The press apparatus as claimed in claim 1 or 2, wherein the subframe is connected to the frame via drive means. 4. Press device according to claim 3, wherein the drive means is formed by one or more drive cylinders. The frame according to any one of the preceding claims, wherein the frame is provided with one or more stops, the subframe has one or more counter stops, and the counter stops the frame's stop for accurate positioning of the subframe at a determined position relative to the frame. A press device, characterized in that the cooperative operation with the part. 6. Press device according to claim 5, characterized in that at least the stop or the opposite stop is displaceable between the operating position and the non-operating position. The press as claimed in claim 3, wherein the drive means for displacing the subframe generates a deflection which provides a force to the stop of the frame at the opposite stop of the subframe. Device. The press apparatus as claimed in any one of the preceding claims, wherein the drive means for displacing the ram component is formed by a rotatable eccentric shaft and a drive motor connected to the eccentric shaft.