Metal working – Plural diverse manufacturing apparatus including means for... – With means to feed work intermittently from one tool station...
Patent
1993-08-20
1994-11-08
Briggs, William
Metal working
Plural diverse manufacturing apparatus including means for...
With means to feed work intermittently from one tool station...
29564, 29759, 29827, B23P 2300, B23Q 714, B21D 4300
Patent
active
053614860
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a system of machining devices particularly for machining so-called lead frames, such as punching, cutting and bending. Such lead frames are intended for carrying chips. The intended processes to be performed on the lead frames are performed in a so-called cutting and bending machine. Such a cutting and bending machine needs to combine great accuracy with the highest possible machining speed. For machining the lead frames are carried by means of transporting means through the machine, placed on a machining station and subjected to a machining, whereafter the transporting means pick up the lead frames again and transport them to a following station. The entire process takes place automatically.
In older machines the machine tool is driven via pneumatic means in order to perform an active stroke. A pneumatic cylinder coupled to the tool carrier is employed for this purpose. Later machines were driven via hydraulic means since the forces generated therewith are greater than the forces obtained via pneumatic means. A complication in such a type of device is that a comparatively large stroke length is required since the transporting means require a free passage in order to be able to place the lead frame on a machining station and then pick it up again. It is furthermore desirable to be able to visually inspect the machining zone.
The hydraulic driving also has other different drawbacks. Firstly, the use of a hydraulic medium is not easily compatible with the clean environment in which the process must take place. In addition, the accuracy of the movement via hydraulic means is limited, since this movement is only guided by one guide, the hydraulic piston rod. In the past different steps have been taken to increase this accuracy, but the possibilities are limited. Should it be desired to further increase the speed, the hydraulic drive imposes limits, since the speed is limited among other reasons because the driving hydraulic medium has to surmount a dead point during a complete cycle of the active stroke. The result is that the transport of the lead frame can only be performed when it has been established that the stroke of the tool has ended at a predetermined position.
SUMMARY OF THE INVENTION
The invention has further for its object to obviate the above mentioned drawbacks. Particular objectives here must be a great stroke length, a high speed, a clean operating environment and great accuracy of the movement of the tool relative to the lead frame.
From JP-A-6165461 a cutting device as defined in the preamble of claim 1 is known.
Besides cutting the leads of a lead frame other operations should be machined, such as bending and punching. Thereto, according to the prior art, the lead frame should be taken out from such a machine and it should be placed in another machining device.
It is the object of the invention to provide an integrated system in which all the necessary operations are being carried out automatically in a controlled way.
The above object is achieved according to the invention by a system of the type which includes machining devices placed in series, particularly for machining lead frames, such as by punching, cutting and bending, and means for transporting the lead frames for machining along a transport path between successive machining devices. In accordance with the present invention, each machining device comprises a main frame, a tool carrier carrying a tool and movable substantially perpendicularly to the transport path for performing an active stroke, a member driving the tool carrier, the member being an eccentric rotatably drive by a motor, mounted in the main frame of the machining device and coupled to a main shaft, transport means, driven by a cam disc placed on the main shaft, for transporting the lead frames in horizontal and vertical directions in the machining device, and a control device coupled to the machining devices for controlling the operation of the machining devices.
By providing an integrated modular automaticall
REFERENCES:
patent: 3481235 (1969-12-01), Kaufman et al.
patent: 3728597 (1973-04-01), Cummens et al.
patent: 4429559 (1984-02-01), Depuglia et al.
patent: 4516673 (1985-05-01), Kashihara et al.
patent: 4885837 (1989-12-01), Eshima et al.
patent: 4923386 (1990-05-01), Eshima et al.
Patent Abstracts of Japan, vol. 11, No. 224 (M-609) (2672), 22 Jul. 1987 & JP-A-62 039 107 (Matsumura), 20 Feb. 1987.
Patent Abstracts of Japan, vol. 10, No. 233 (E-427) (2289), 13 Aug. 1986 & JP-A-61 065 461 (Matsumura), 4 Apr. 1986.
Patent Abstracts of Japan, vol. 11, No. 294 (E-544) (2741), 22 Sep. 1987 & JP-A-62 093 967 (Toei Seiko), 30 Apr. 1987.
De Boer Willem A.
Harmsen Johannes G. T.
ASM-Fico Tooling B.V.
Briggs William
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