JP3104405B2 - Coil plating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil plating apparatus for partially plating a lead frame for joining IC and transistor chips.

[0002]

2. Description of the Related Art In recent years, as a device for partially plating a lead frame of a transistor or an IC, a lead frame formed by pressing a coiled thin plate of iron, nickel alloy or copper alloy and automatically forming the plate is automatically plated. In many cases, coil plating equipment is used. FIG. 3 is a configuration diagram showing a conventional example of a coil plating apparatus. In the coil plating apparatus shown in FIG. 3, the pre-processing unit 3 continuously performs pre-processing while unwinding the coiled lead frame 1 from the uncoiler (delivery spool) 2, and intermittently performs partial plating in the plating unit 12. Is performed, the post-processing unit 17 continuously performs post-processing, and performs a series of operations of winding around a coiler (winding spool) 23. As described above, this type of coil plating apparatus has a continuous portion (a continuous processing portion, ie, a pre-processing portion and a post-processing portion) and an intermittent portion (an intermittent processing portion, ie, a plating portion). It is necessary to synchronize the average processing speed of the unit and the speed of the continuous unit.

Next, the plating section of the conventional coil plating apparatus will be described with reference to FIG. 1 (note that the plating apparatus itself is the same as the present invention and the conventional example, so the coil plating apparatus of the present invention This will be described with reference to the plated portion shown in FIG. 1 which is a main configuration diagram). In the plating apparatus 12, the pressing rubber 57 is pressed against the upper opening of the plating jig 50 by the cylinder 56 during the plating. In this state, the plating solution flows from the plating solution inlet 51 at the lower portion of the plating jig, and is sprayed to a predetermined position of the lead frame through the rectifying plate 53 and the jet hole 55 arranged in the plating jig. Is discharged from a plating solution outlet 52 arranged at the lower portion of the plating solution.

At the same time, a direct current is supplied from the anode of the rectifier 58, and the current flowing to the lead frame through the anode plate 54 and the jet hole 55 is coaxially mounted on the axis of the index roller 13 'driven by the index motor 13. Return to the cathode of the rectifier through the current collector. Electroplating is performed at a predetermined position on the lead frame by supplying the plating solution and the DC current to the lead frame as described above.

Accordingly, in the plating section 12, the lead frame 1 is fixed during the plating, and after the plating is completed, the lead frame is moved at a high speed by the index motor 13 to perform an intermittent operation. For this reason, the idler 9 of the dancer roll arranged upstream of the plating section 12
Moves downward during plating to absorb slack in the portion of the upstream lead frame, while the idler 14 of the dancer roll disposed downstream of the plating section 12 moves upward to move the lead frame of the downstream lead frame. Absorbs part tension. Conversely, the idler 9 moves upward during fixed length movement of the lead frame to absorb the tension of the upstream lead frame portion, and the idler 14 moves downward to move the downstream lead frame portion. Absorbs slack.

Next, the synchronization between the intermittent operation of the plating unit and the continuous operation of the pre-processing unit will be described with reference to FIG. 3 again showing a conventional configuration of a coil plating apparatus. In order to detect the position of the idler 9, for example, the upper limit position and the lower limit position, a plurality of (two in this conventional example) detection switches 10 and 11 are arranged close to the path of the idler 9. Drive rollers 4 ′ and 4 ′ for driving the lead frame 1 so as to rewind the lead frame 1 from the uncoiler 2 are disposed downstream of the pre-processing unit 3. Drive roller 4 ',
Reference numeral 4 'is driven by the drive motor 4. The rotation speed of the drive motor 4 is set by a high-speed setting device 7 and a low-speed setting device 8.
, And is controlled via the drive controller 5.

Next, a conventional control method based on the configuration of the conventional example configured as described above will be described. As long as plating is performed in the plating section, as described above, the plating section 12 The idler 9 moves downward to absorb the slack in the portion of the lead frame moved by the drive rollers 4 'and 4'. As a result, when the idler 9 is detected by the idler detection switch 11, the speed changeover switch 6 selects the low speed setting device 8 and gives a setting signal for setting the low speed setting device 8 to the drive controller 5. At this time, the setting signal must always be set to a value lower than the average moving speed of the plating part.

Further, after plating is completed, when the lead frame sandwiched between index rollers 13 'driven by the index motor 13 is moved at a high speed and fixed size,
When the idler 9 is detected by the idler detection switch 10, the speed changeover switch 6 selects the high-speed setting device 7 and gives a setting signal to the drive controller 5. At this time, the setting signal must be set to a value faster than the average moving speed of the plating section.

A similar structure is provided for the post-processing side. That is, an idler 14, idler detection switches 15, 16 and a post-processing unit 17 are provided, and drive rollers 18 ', 18' are arranged downstream of the post-processing unit 17. The drive rollers 18 ′ and 18 ′ are driven by the drive motor 18, and the rotation speed of the drive motor 18 is set by a high-speed setting device 21 and a low-speed setting device 22.
High speed or low speed is switched by a speed changeover switch 20 and is controlled via a drive controller 19. The post-processing side also synchronizes with the plating part by the same operation, but since it is on the winding side, when the upper idler detection switch 15 is operated, the speed changeover switch 20 selects the low-speed setting unit 22 and the idler When the detection switch 16 operates, the high-speed setting device 21 is selected.

[0010]

In the synchronous operation according to the above-described control method, the plating time is t ₁ , the total time of the vertical movement of the cylinder 56 and the index time is t ₂ , and the distance for operating the index once. Where l ₁ , the high-speed speed on the pre-processing side is v ₁₁ , the low-speed speed is v ₁₂ , the high-speed speed on the post-processing side is v ₂₁ , and the low-speed speed is v ₂₂ , the following equation (1):
It is necessary to always maintain the relationship of (2). v ₁₁ > l ₁ / (t ₁ + t ₂ )> v ₁₂ (1) v ₂₁ > l ₁ / (t ₁ + t ₂ )> v ₂₂ (2)

However, when the type of lead frame is changed, l ₁ changes, and when l ₁ changes, t ₂
Changes. Further, since t ₁ changes depending on the type of plating, it is necessary to always maintain the expressions (1) and (2), so that it becomes complicated to adjust the speed setting unit every time the apparatus is started or the quality is exchanged.

Further, the difference between v ₁₁ and v _12, the difference between v ₂₁ and v _22, if larger, but the work is simple, as the difference conversely large, the processing time difference between the pre-treatment and post-treatment As a result, processing unevenness occurs and quality is adversely affected. Therefore,
Possible v ₁₁ and v there is less need to set the difference between the difference and v ₂₁ and v ₂₂ of _12, is in a difficult situation to adjust the setting device while viewing the idler realistically intermittently moved up and down .

Accordingly, an object of the present invention is to automatically synchronize the pre-processing and post-processing with the average speed of the plating section, and always perform pre- and post-processing at a constant speed to maintain a uniform plating quality. An object of the present invention is to provide a plating apparatus.

[0014] To achieve the above-mentioned object, the present invention provides:
In a plating apparatus that intermittently feeds a coil-shaped lead frame in a plating section, performs plating, and continuously feeds a lead frame through an idler that guides the lead frame in a pre-processing section and a post-processing section of the plating section, A position signal for measuring a vertical position of an idler for applying tension to the lead frame during transfer of the lead frame by the first transfer unit, and outputting a position signal by measuring the vertical position of the idler. Generating means, speed setting means for presetting the speed of the lead frame by the first transfer means in the pre-processing unit and post-processing unit to a predetermined value, and a position signal generated from the position signal generating means. An error is detected from the displacement of at least one of the upper end and the lower end in the vertical movement of the lead frame Error detecting means, a second transferring means for transferring the lead frame at the time of non-plating, an intermittent transferring amount is preset according to the type of the lead frame, and a center position which is a reference for the vertical movement of the idler. Synchronizing the speed of the first transfer unit and the speed of the second transfer unit by resetting the transfer speed of the lead frame by the first transfer unit based only on the error detected by the error detection unit without setting. And a coil plating apparatus characterized in that the coil plating apparatus comprises:

[0015]

Next, a preferred embodiment of the present invention will be described with reference to the drawings. In FIG. 1, idlers 9 and 14
Is suspended from one end of chains 60 and 80, and weights 62 and 82 are attached to the other ends of chains 60 and 80 via chain wheels 61 and 81. Rotary encoders 63 and 83 are coaxially attached to the chain wheels 61 and 81, and the rotary encoders 63 and 83 are connected to up-down counters 64 and 84, respectively. Addition and subtraction are performed at 64 and 84, and their outputs are input to the general controller 67. The general controller 67 is connected to D / A (digital / analog) converters 65 and 85, and a digital signal from the general controller 67 is converted into an analog signal by these D / A converters 65 and 85. The analog signal is supplied to a drive controller 5 for controlling the drive motor 4 of the pre-processing unit and the drive motor 18 of the post-processing unit, respectively.
And 19 to set the speed of these drive controllers 5 and 19. The drive controllers 5 and 19 rotate the drive motors 4 and 18 according to the set signal, and move the lead frame 1 sandwiched between the drive rollers 4 'and 18' coaxially mounted at a predetermined speed.

An index setting unit 66 is connected to the general controller 67, and the index amount set by the index setting unit 66 is given to the index motor controller 59 via the general controller 67, and the index amount is set. The index motor 13 is rotated according to
Lead frame 1 sandwiched between index rollers 13 '
Is moved by a fixed amount. When the movement is completed, an end signal is input from the index motor controller 59 to the general controller 67. These series of operations are performed in conjunction with the operation of the plating solution blowing pump (not shown), the vertical movement of the pressing rubber 57 by the cylinder 56, and the on / off operation of the rectifier 58. In this embodiment, a driving roller is used for the index of the plating portion, but an air cylinder or an electric cylinder may be used instead of the driving roller.

When the plating portion is plating, the idler 9 moves down and the idler 14 moves up. The pulses of the rotary encoders 63 and 83 at this time cause the up / down counters 64 and 84 to count up by the number of pulses, that is, to be added. Next, when the plating is completed and the lead frame 1 is moved by the drive of the index motor 13 after the pressing rubber 57 is raised, the idler 9 is raised and the idler 14 is lowered. At this time,
The up / down counter 64 counted up earlier,
84 is counted down by the number of pulses by the pulses of the rotary encoders 63 and 83, that is, is subtracted.

Next, this state will be described with reference to FIG. 2. During the plating time t ₁ during plating, the up / down counters 64 and 84 add and count the number of pulses from the rotary encoders 63 and 83. obtaining a value C _1. Then, during the t ₂ time vertical movement of the cylinder 56 and the total time of the index time, a rotary encoder 63,8
Up / down counter 6 by the number of pulses by pulse 3
4, 84 is subtracted. As a result, the count value of ΔC ₁ remains after the end of the index.

The general controller 67 subtracts Δc ₁ from the digital value C ₀ corresponding to the speed signal v ₀ given to the drive controllers 5 and 19 and converts the value of C ₀ −Δc ₁ into a D / A converter. 6
Speed is reduced by giving 5,85. FIG. 2 shows that the remaining cycles of the up / down counters 64 and 84 contract to zero while repeating this series of cycles for each index. In addition, C ₀ performs the idle operation of the plating section in advance, measures the plating time t ₁ , the total time t ₂ of the vertical movement time of the cylinder 56 and the index time, and sets the set value l ₁ of the index setting device 66. And v ₀ = l ₁
/ (T ₁ + t ₂ ) is calculated and obtained in advance from the characteristics of the D / A converters 65 and 85 as data corresponding to v ₀ .

With the above-described configuration and the above-described operation, even when the type to be plated is changed (at this time, the plating time t ₁ changes), the pre-processing and post-processing are performed. If the speed v ₀ is determined in advance in the idle operation as described above (that is, temporarily set), the error during the actual operation can be obtained as the remaining count value of the up / down counter as described above. By resetting and feeding back the processing speed in the general controller 67 so as to eliminate the problem, the average processing speed of the plating unit and the continuous processing speed of the pre-processing unit and the post-processing unit are automatically synchronized, and the speed is It is kept constant.

[0021]

As described above, according to the present invention,
Regardless of the type of plating, the processing speed is set in advance, and the average speed of the plating unit and the continuous processing speed of the pre-processing unit and post-processing unit can be automatically synchronized, eliminating operating errors by feedback. The setting operation enables more accurate speed control than before.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a main part of a plating apparatus of the present invention.

FIG. 2 is a waveform diagram illustrating a speed operation of the present invention.

FIG. 3 is a schematic diagram showing a configuration of a conventional plating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead frame 2 Uncoiler 3 Pre-processing part 4 Drive motor 4 'drive roller 5 Drive controller 9 Idler 12 Plating part 13 Index motor 14 Idler 17 Post-processing part 59 Index controller 60 Chain 61 Chain wheel 63, 83 Rotary encoder 64, 84 Up / down counter 65, 85 D / A converter 66 Index setting device 67 General controller

Claims (3)

(57) [Claims] 1. A plating apparatus for intermittently feeding and plating a coil-shaped lead frame in a plating section and continuously feeding the lead frame via an idler for guiding the lead frame in a pre-processing section and a post-processing section of the plating section. At
A position signal is obtained by measuring a vertical position of an idler that applies tension to the lead frame during transfer of the lead frame by the first transfer unit during transfer of the lead frame during both plating and non-plating. Output position signal generating means, speed setting means for presetting the speed of the lead frame by the first transfer means in the pre-processing unit and post-processing unit to a predetermined value, and a position signal generated from the position signal generating means Error detecting means for detecting an error from a displacement of at least one of the upper end and the lower end in the vertical movement of the lead frame obtained by;
A second transfer means for transferring the lead frame during non-plating, wherein the intermittent transfer amount is preset according to the type of the lead frame, and the error without setting a center position as a reference for the vertical movement of the idler. Synchronizing means for resetting the transfer speed of the lead frame by the first transfer means based on only the error detected by the detection means and synchronizing the speed of the first transfer means and the speed of the second transfer means. A coil plating apparatus. 2. The coil plating apparatus according to claim 1, wherein said second transfer means is an index motor for intermittently feeding said lead frame, an index motor controller for controlling said index motor, and said index motor. An index setting device for setting an index for giving the intermittent transfer amount of the lead frame to a controller. 3. The coil plating apparatus according to claim 1, wherein the position signal generating means detects a rotating body that supports the idler and rotates in association with the vertical movement of the idler, and detects a rotation angle of the rotating body. An up-down counter for counting up or down movement of the idler by the output pulse of the rotary encoder and counting down the other to count the difference. And a coil plating apparatus.