JPH05343583A - Processing machine for lead frame - Google Patents

Abstract

PURPOSE:To facilitate a type replacing operation and to realize general purpose use by eliminating an operation for regulating a feeding mechanism in the case of replacing a processing die. CONSTITUTION:A processing machine for a lead frame advances and retracts a feed arm 12 in a product feeding direction, and processes as prescribed while sizing a product, and comprises a movable feed arm 12 mounted at a die 10 side to be set to the machine to move in response to a feeding stroke of a product, and driving mechanisms 40, 42 for advancing and retracting the arm when the die 10 mounted with the arm is set.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A lead frame processing machine is used as a device for bending leads into a predetermined shape on a lead frame after resin molding. The lead frame processing machine is usually configured to feed the lead frame at a fixed size and to perform the processing sequentially.The feed mechanism for feeding the lead frame at a fixed size and the punch and die for performing the required processing on the lead frame. And a processing mechanism such as. Here, since processing dies such as punches and dies differ depending on the product, when applying different products to the processing machine, it is necessary to replace and set the processing dies for that product. It is adjusted according to the product.

[0003]

Since the conventional lead frame processing machine is provided with the lead frame feed mechanism separately from the processing die, the processing die is set again when the product is replaced. At the same time, the feed mechanism is reciprocated with a constant stroke to re-adjust the moving range of the feed arm that feeds the lead frame at a fixed size. The movement range of the feed arm is made by adjusting the installation position of the stopper that regulates the movement position.In this way, in the conventional lead frame processing machine, the adjustment work at the time of product type change is troublesome, and the product type is frequently changed. Such a processing machine has a problem that replacement work becomes very complicated. Therefore, the present invention has been made to solve the above problems, and an object thereof is to facilitate complicated work such as adjustment of a feeding mechanism at the time of product exchange,
An object of the present invention is to provide a lead frame processing machine capable of facilitating product type exchange and suitably handling multi-product production.

[0004]

The present invention has the following constitution in order to achieve the above object. In other words, in a lead frame processing machine that performs the required processing while advancing and retracting the feeding arm in the product feeding direction to feed the product at a fixed size, the lead frame moves to the mold side set in the processing machine according to the product feeding stroke. It is characterized in that the processing machine is provided with a drive mechanism for mounting the feed arm as much as possible, and for moving the feed arm forward and backward when the mold having the feed arm is set. In addition, a pusher that acts on the feed arm attached to the mold to move the feed arm forward and backward is provided in communication with the feed arm, and the pusher is reciprocally driven by the drive mechanism provided in the processing machine. It is characterized by being provided,
It is characterized in that a stopper mechanism for restricting a front end position and a rear end position of the feed arm is provided in the mold in order to define a moving range of the feed arm. Further, a pair of air cylinders having drive rods that move in parallel with the advancing / retreating direction of the feed arm are provided as a drive mechanism so as to face each other at a predetermined interval, and the drive rods contact the middle of the drive rods of the air cylinders. The pushing body for pushing is arranged.

[0005]

The feeding arm mounted on the mold is mounted with the feeding stroke and the like set in advance according to the product to be processed by the mold. By setting the mold with the feed arm mounted on the processing machine, the feed mechanism is driven forward and backward by the drive mechanism provided on the processing machine side. The movement range of the feed arm is set to a predetermined position for each product by the stopper mechanism. The air cylinder moves the pusher body back and forth by alternately pushing the pusher bodies arranged in the middle thereof, thereby moving the feed arm forward and backward by a fixed amount.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view showing the configuration of a setting unit of a processing die in a lead frame processing machine according to the present invention. In the figure, 10 is a mold, and 12 is a feed arm mounted on the mold 10. In the present invention, the feed arm 12 is attached to the die 10 in advance, and the die 10 attached with the feed arm 12 is set in the processing machine. Feeding arm 1
2 is fixedly attached to both ends of the connecting rod 14 at predetermined intervals according to the product to be processed by the die 10, and is guided and supported by the LM guide 16 attached to the side surface of the die 10. FIG. 4 shows a state in which the mold 10 is viewed from the side surface direction. As shown in the figure, the LM guide 16 is attached to the side surface of the mold 10, and the LM guide 16 is provided with a support plate 18
Is vertically fixed and the connecting rod 14 is connected to the support plate 18.
Attach. The connecting rod 14 supports the support plate 16 so as to be rotatable about its axis.

FIG. 2 shows the support plate 18 viewed from the front. The feed arms 12 are fixed to both ends of the upper portion of the support plate 18, and the feed arms 12 and 12 are connected by a connecting rod 14. At the intermediate position of the connecting rod 14, the feed error detection plate 20 is horizontally fed so as to project to the front side in the figure.
To fix. The feed error detection plate 20 is for detecting a feed error when the pin attached to the feed arm 12 does not go into the guide hole of the lead frame and the tip of the feed arm 12 is lifted when the product is fed at a constant size. .. The operation of the feeding error detection plate 20 will be described later.

The feed arm 12 is attached to the die 10 in advance as described above, and the die 10 is set together with the feed arm 12 in the processing machine. The drive mechanism for moving the feed arm 12 back and forth with a constant stroke is on the processing machine side. Set up in. That is, reference numerals 40 and 42 in FIG. 1 are air cylinders used as a drive mechanism for moving the feed arm 12 forward and backward. The air cylinders 40 and 42 are set parallel to the side surface of the mold 10 on which the feed arm 12 is attached as shown in the drawing, and are set slightly apart from the side surface of the mold 10. Figure 3 shows the air cylinder 4
The attached state of 0 and 42 is shown. Air cylinder 40, 4
2 are installed facing each other on the mounting base 44 at predetermined intervals. The mounting positions of the air cylinders 40 and 42 are fixed and set in the processing machine, and do not vary depending on the product. A urethane pad 46 is attached to the front ends of the drive rods of the air cylinders 40 and 42 as a cushion.

Since the feed arm 12 is moved back and forth by the air cylinders 40 and 42, as shown in FIG.
The pusher 22 is extended from the air cylinder 40 to an intermediate position between the air cylinders 40 and 42. The pusher 22 extends outward from the side surface of the support plate 18 and is fixed to the tip of a support arm 24 attached thereto.
The pusher 22 is moved forward and backward by the pads 46 of the air cylinders 40 and 42 hitting both end surfaces thereof, and the height position and the extension distance from the mold 10 are set according to the contact surface of the pad 46.

In FIG. 2, reference numerals 30 and 32 denote stopper mechanisms for restricting the moving end position when the pusher 22 moves back and forth.
The stopper mechanisms 30 and 32 restrict the moving end position of the pusher 22 by the support arm 24 supporting the pusher 22 contacting at the base position. The stopper mechanisms 30 and 32 of the embodiment are formed by a shock absorber method in order to absorb a shock when the pusher 22 is pushed by the air cylinders 40 and 42. That is, the cushioning member 34 is provided so as to project from the end face that abuts the support arm 24 and determines the moving end position, and the support arm 24 abuts the cushioning member 34 to absorb the shock and determine the end face position. There is.
As shown in FIG. 1, the support arm 24 is formed to be slightly wider at the mounting position on the mold 10 side, and the side surface of this wide portion contacts the stopper mechanisms 30 and 32 to regulate the moving end.

As described above, in the processing machine of the above embodiment, the setting of the drive mechanism on the processing machine side such as the air cylinders 40 and 42 is made common, while the feed arm 12, the pusher 22 and the like are provided on the die side. Pre-installed items are set on a processing machine and processed. In the case of the above embodiment, the mold 1
By setting 0 in the processing machine, the feed arm 12 and the pusher 22 are simultaneously set in predetermined positions, and the pushers 22 are alternately pushed by the air cylinders 40, 42 by alternately operating the air cylinders 40, 42. The feed arm 12 moves back and forth. That is, by controlling the drive of the air cylinders 40 and 42, the feed arm 12 can reciprocate to feed the lead frame at a fixed size.

The feed position and the return position of the feed arm 12 are set by the air cylinders 40 and 42 as described above.
When the support arm 24 is brought into contact with the stopper mechanisms 30 and 32 when the pusher 2 is pushed, it can be accurately determined. In this way, the processing machine of the present embodiment is characterized in that the arrangement of the air cylinders 40, 42, etc., as a drive mechanism for reciprocating the feed arm 12 is fixed, and that the mold 10 side has a configuration that varies depending on the product. And That is, processing is carried out on the processing machine as it is by simply setting appropriately the arrangement position and arrangement interval of the feed arm 12 on the die 10 side, the reciprocating stroke distance of the feed arm 12 at the time of constant size feed, etc. according to the product. It will be possible.

When arranging the air cylinders 40 and 42 for moving the feed arm 12 forward and backward, set the air cylinders 40 and 42 so as to be commonly used for various products to be applied to the processing machine so that they can be widely used in accordance with the constant feed interval. Good. The pusher 22 is pushed by the air cylinders 40 and 42 to the position where the movement is restricted by the stopper mechanism, and the required feeding operation can be performed. According to this structure, it becomes possible to start the processing simply by setting the mold on the processing machine without adjusting the feed amount.

FIG. 5 shows a mechanism for detecting a feed error by the feed error detection plate in the apparatus of the above embodiment. In the figure, 50 is an air cylinder for supporting the feed error detection plate 20 substantially horizontally. The drive rod 52 of the air cylinder 50 engages with one end of a connecting arm 54 pivotally supported in a vertical plane with respect to the support column 53, and a cam plate 56 is attached to the other end of the connecting arm 54. A cam follower 58 is attached to the lower side surface of the cam plate 56.
Is contacted with the lower surface of the feed error detection plate 20 to support the feed error detection plate 20.

When the product is fed at a fixed size, the feed arm 12 is horizontally supported by the air cylinder 50, and the feed arm 12 moves by a predetermined stroke to feed the product at a fixed size. The feed arm 12 is always kept horizontal during the fixed-size feed, and the product is supported by the feed plate and moves up and down.
When the product is fed at a fixed size, the feed plate is lifted and the pins provided on the feed arm 12 are inserted into the guide holes of the lead frame to feed the lead frame at a fixed size. When the pin provided on the feed arm 12 is not correctly inserted into the guide hole during the fixed-size feed, the pin is placed on the upper surface of the lead frame and the feed arm 1
The tip side of 2 is lifted. At this time, since the end of the feed error detection plate 20 is lowered, the feed error can be detected by this.

The end position of the feed error detection plate 20 is detected by the proximity sensor 59, and when the feed error detection plate 20 descends from a predetermined position and becomes a certain distance or more, the proximity sensor 59 detects the feed error. When a feed error is detected, the air in the air cylinder 50 is cut off,
The feed arm 12 can be manually rotated. Further, at that time, the apparatus can be brought to an emergency stop to eliminate the product feed abnormality.

In the apparatus of this embodiment, the pushing body 22 is moved back and forth by switching the pushing direction of the pushing body 22 by the air cylinders 40 and 42 as described above, thereby moving the feed arm 12 forward and backward. Therefore, in an actual device, it is necessary to appropriately switch the operation of the air cylinders 40 and 42 so that the feed arm 12 can be moved back and forth smoothly. Particularly, when the pusher 22 is simply pushed by the air cylinders 40 and 42, the drive rod gives an impact to the end face of the pusher 22, so that the pusher 22 can be smoothly moved in order to move smoothly.
It is necessary to control the air cylinders 40 and 42 so that the air cylinders are not impacted.

FIG. 6 shows an air circuit of an embodiment for driving and controlling the air cylinders 40 and 42. In the figure, 60 is an air source, 6
Reference numeral 1 is a regulator for generating low pressure, 62 is a solenoid valve for switching between high pressure and low pressure, and 63 and 64 are solenoid valves for switching air to the air cylinders 40, 42. The solenoid valves 63 and 64 are 3-position double solenoids. Reference numeral 65 is a regulator, and 66 is a speed controller. The speed controller 66 is for controlling the exhaust pressure.

The air cylinders 40 and 42 are controlled as follows by the air circuit of this embodiment. First, the solenoid valve 6
When 3, 64 are in the neutral position, the air cylinders 40, 42 are in the free state. In this state, the mold is replaced and set. When the mold is set and is in the operating state, the solenoid valve 62 is switched to the low pressure side, and the solenoid valve 63 is moved in the direction in which the air cylinder 42 advances and the air cylinder 40 retracts (the direction in which the pusher 22 retracts). 64 is switched. As a result, the air cylinders 40 and 42 are driven at a low pressure to move the pusher 22 to the return position. This state is the starting position for the sizing movement of the feed arm 12.

When the pusher 22 has moved to the movement start position, the solenoid valve 62 is switched to the constant size feed drive by high pressure,
The solenoid valves 63 and 64 are switched to switch the air cylinders 40 and 42.
Apply high pressure to. Since low pressure air is introduced into the air cylinder 42 by the regulator 65, the pusher 22 moves in the forward direction as it is sandwiched by both air cylinders 40 and 42 from both sides. It is possible to smoothly move by moving the low pressure air while putting it in by the regulator 65. Thus, the solenoid valve 62
By switching the solenoid valves 63 and 64, the pusher 22 can be reciprocally driven by the air cylinders 40 and 42. The speed controller 66 controls the exhaust pressure of the air cylinders 40, 42, and the air cylinder 40, 42 is controlled by appropriately controlling the exhaust pressure.
42 can be used as a shock absorber.

FIG. 7 shows that the air cylinders 40 and 42 are
Another air circuit for performing the air drive similar to the above is shown. In this example, electromagnetic valves 65 and 66 for switching between high pressure and low pressure are provided in the respective air cylinders 40 and 42, and when the pusher 22 is pushed by the air cylinders 40 and 42,
The air pressure of one air cylinder sandwiching the pusher 22 and the air pressure of the other air cylinder are provided with a height difference, and the air cylinder on the low pressure side absorbs the impact and operates. The air circuits shown in FIG. 6 and FIG.
42 is driven.

[0022]

As described above, according to the lead frame processing machine of the present invention, since the die side is provided with the individual mechanism such as the feeding arm, the feeding is performed every time the die is set in the processing machine. There is no need to adjust the mechanism, and machining can be performed simply by operating the replacement set. By setting the feed arm etc. in advance on the mold side according to the product, the exchange operation can be facilitated even when handling various products, and versatility can be increased to enable efficient work. To work.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a mold is set on a lead frame processing machine.

FIG. 2 is an explanatory diagram showing a set state of a mold as viewed from a back surface direction.

FIG. 3 is an explanatory diagram showing an arrangement of air cylinders.

FIG. 4 is an explanatory view of the die as viewed from the side, showing a mounting state of the pusher.

FIG. 5 is a side view of a feed error detection mechanism.

FIG. 6 is an explanatory diagram showing an embodiment of an air circuit that drives an air cylinder.

FIG. 7 is an explanatory view showing another embodiment of the air circuit for driving the air cylinder.

[Explanation of symbols]

 10 die 12 feed arm 14 connecting rod 16 LM guide 18 support plate 20 feed error detection plate 22 pusher body 24 support arm 30, 32 shock absorber 40, 42 air cylinder 46 pad 50 air cylinder 60 air source 61, 65 regulator 62, 63, 64, 65, 66 Solenoid valve

Claims (4)

[Claims] 1. A lead frame processing machine for performing a required processing while advancing and retracting a feeding arm in a product feeding direction to feed a product at a fixed size, and a feed stroke of the product is set to a die set on the processing machine. A lead frame characterized in that the processing machine is provided with a drive mechanism for mounting the feed arm so as to be movable together and for moving the feed arm forward and backward when a mold having the feed arm is set. Processing machine. 2. Acting on a feed arm attached to a die,
The lead frame according to claim 1, wherein a pusher for moving the feed arm forward and backward is provided so as to be connected to the feed arm, and the pusher is reciprocally driven by the drive mechanism provided in the processing machine. Processing machine. 3. The lead frame according to claim 2, wherein a stopper mechanism for restricting a front end position and a rear end position of the feed arm is provided in the mold so as to define a moving range of the feed arm. Processing machine. 4. A pair of air cylinders having drive rods that move parallel to the advancing / retreating direction of the feed arm are provided as a drive mechanism so as to face each other with a predetermined gap, and the drive rods are provided in the middle of the drive rods of the air cylinders. The lead frame processing machine according to claim 2 or 3, wherein the pushing body that abuts and pushes is arranged.