Claims
- 1. A press comprising: two crossheads spaced at a distance from one another; uprights interconnecting said crossheads; said crossheads and uprights forming a frame of said press; a ram mounted for translatory motion between said uprights; a nut with a non-self-stopping thread, said nut being built into said ram; another ram mounted for translatory motion between said uprights; a die holder mounted in the second-mentioned ram for translatory motion therewith and for rotation thereabout; a screw rigidly connected to said die holder and cooperating with said nut during translatory motion of the first-mentioned ram and forming a kinematic couple therewith; drive means to enable translatory motion of the die holder, said drive means including an electric motor, a shaft with a first eccentric, a pair of second eccentrics, said second eccentrics being offset circumferentially from said first eccentric, said shaft mounted in one of said crossheads operatively connected to said electric motor, a connecting rod having one end thereof operatively connected to said screw and another end operatively connected to the first eccentric of said shaft; and wherein said first drive includes two connecting rods linked to said first ram, said two connecting rods operatively coupled to respective ones of said second eccentrics; said connecting rods causing said die holder to both translate and rotate relative to said press.
- 2. A press as claimed in claim 1, wherein the two second eccentrics are positioned on the shaft symmetrically with said first eccentric and turned relative thereto in the direction opposite to the direction of rotation of the shaft through an angle sufficient to permit a specified angle of rotation of the die holder.
- 3. A press as claimed in claim 1, wherein said first drive includes an auxiliary shaft mounted on the other crosshead of the frame and provided with two eccentrics operatively connected to the first ram and coupled to an auxiliary electric motor through a train of gears, with the angle in the direction of rotation of the shafts between a given axis of the press and the eccentric of the shaft being greater than the angle between said given axis of the press and the eccentrics of the auxiliary shaft by a value sufficient to permit a specified angle of rotation of the die holder.
- 4. A press as claimed in claim 1, wherein said first drive includes a pin mounted in said connecting rod away from the longitudinal axis of the connecting rod at a distance sufficient to permit a specified angle of rotation of the die holder, said pin being operatively coupled to each of the connecting rods linked with said first ram.
- 5. A press as claimed in claim 1, wherein said first drive includes two rockers arranged symmetrically with the second eccentric to enable translatory motion of said screw, said rockers each having at least one arm coupled to one of the connecting rods operatively connected with the ram and another arm through at least one intermediate link to the connecting rod joined with the screw and away from the geometric axis of the eccentric at a distance sufficient to permit a specified angle of rotation of the die holder.
Parent Case Info
This is a division of application Ser. No. 507,078, filed June 23, 1983, and now U.S. Pat. No. 4,559,807.
Foreign Referenced Citations (1)
Number |
Date |
Country |
706173 |
Dec 1979 |
SUX |
Divisions (1)
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Number |
Date |
Country |
Parent |
507078 |
Jun 1983 |
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