TAILIEUCHUNG - Diemaking and Die Design 1915 Episode 11

Tham khảo tài liệu 'diemaking and die design 1915 episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2Ổ4 FEEDING MECHANISMS Other left. The connecting-rod c has a flat on it which can be engaged by a wrench and by turning the rod a very fine adjustment of the knockout is secured. Further adjustment may be made by using different sizes of washers J and knockout pins I. The collars E support bearings in which the shaft F turns and these collars have four short legs cast on them it being possible to file the legs to compensate for irregularities in the frame of the punch-press on which the attachment is to be applied. The collars are fastened to the bed of the press by four halfinch cap-screws. The crank D is keyed to the shaft F and the same method is used in securing the cam G in place. The bracket H has four short legs cast on it so that it may be fitted to the rough bed casting and fastened by two cap-screws. The hole in this bracket is bored large enough so that the knockout pin z is a sliding fit in it. The method of adjusting this attachment is as follows When the ram of the press is in the upper position the crank A is set with the slot vertical. The hub B is next fastened to the lower end of the slot by means of the stud shown at K. On the downward stroke of the ram the crank disk A makes one-half revolution thus raising the connecting-rod c and crank D. The cam G turns and lowers the knockout pin I and coflar J. Then when the ram begins its up-stroke the crankshaft completes the revolution pushing down the connecting-rod c and the crank D and raising the pin I and collar J through the action of the cam G. In this way the work is ejected from the die. In some cases corrugations are milled on the inside of the crank disk and the brake hub to prevent the collar from slipping. Ejecting Press Work with Air Blast. An arrangement for blowing work from a forming die in a punch-press by means of compressed air is shown in Fig. 16. It is simple and durable and is used on about forty presses in a large plant with satisfactory results. The illustration shows a plain .

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