GB1250294A - - Google Patents
Info
- Publication number
- GB1250294A GB1250294A GB1250294DA GB1250294A GB 1250294 A GB1250294 A GB 1250294A GB 1250294D A GB1250294D A GB 1250294DA GB 1250294 A GB1250294 A GB 1250294A
- Authority
- GB
- United Kingdom
- Prior art keywords
- outer rotor
- inner rotor
- rotors
- rotor
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/14—Control arrangements for mechanically-driven presses
- B30B15/142—Control arrangements for mechanically-driven presses controlling the brake or the clutch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
- B30B1/181—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means the screw being directly driven by an electric motor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/14—Control arrangements for mechanically-driven presses
- B30B15/148—Electrical control arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Valve Device For Special Equipments (AREA)
- Press Drives And Press Lines (AREA)
- Dc Machiner (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
1,250,294. Presses. BECORIT GRUBENAUSBAU G.m.b.H. 8 April, 1970 [12 April, 1969], No. 16634/70. Heading B3H. [Also in Divisions B4-B5 and H2] A screw press has an electric motor drive with a pair of rotors 11, 12, one of which is connected to a screw 2 to move a non-rotatable slide 5 with a nut 4 threaded on the screw. The rotors are inductively coupled together by short circuiting the inner rotor 11 to effect a down stroke. The outer rotor 12 comprises a magnet rotatably mounted in the motor casing 14. The slide 5 carries an upper tool 6. In operation the motor is energized to move the rotors in opposite directions but the inner rotor 11 is prevented from rotation by a stop so that the outer rotor 12 acquires considerable inertia. The inner rotor is then short-circuited and inductively coupled for rotation with the outer rotor to bring the tools 6, 10 together. The screw spindle 2 has a small degree of axial freedom and upon the tool 6 hitting the workpiece the spindle is axially displaced to open a switch 26 to stop the short circuit. The short circuit is initiated by a thyristor (28), Fig. 2 (not shown), which is triggered by pulses from a generator (30). At the end of the stroke the rotors are urged in opposite directions to effect the upward stroke. At the end of the upward stroke the inner rotor 11 is stopped by the stop and the outer rotor 12 accelerated again. In a second embodiment, Fig. 3, the outer rotor 112 is driven by a three-phase motor 150. The inductive coupling between the rotors is still used but the upward stroke is effected by a spring (not shown). The thyristor 128, Fig. 5, to effect the short circuit in the inner rotor 111 may be triggered remotely by a magnet 161 which induces voltage in a coil 160 or by a magnet 172 which influences a reed relay switch 171. In a third embodiment, Figs. 7-9 (not shown), the motor is a three-phase motor with a short circuited or squirrel cage inner rotor (211). The outer rotor (212) is connectable to either a three-phase alternating voltage or a D.C. voltage. Initially the switch (290) is closed to supply the alternating voltage. When the outer rotor reaches its peak speed it is connected to the D.C. voltage to inductively couple it to the inner rotor (211). The upward stroke is effected by a spring (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691918637 DE1918637C (en) | 1969-04-12 | Drive for a screw press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1250294A true GB1250294A (en) | 1971-10-20 |
Family
ID=5731007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1250294D Expired GB1250294A (en) | 1969-04-12 | 1970-04-08 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3626222A (en) |
| JP (1) | JPS5122604B1 (en) |
| FR (1) | FR2046190A5 (en) |
| GB (1) | GB1250294A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5042794A (en) * | 1990-03-02 | 1991-08-27 | Giant Manufacturing Co., Ltd. | Load applying device for an exercise bicycle |
| US5365155A (en) * | 1990-10-22 | 1994-11-15 | Marquardt Gmbh | Rotational speed control and use of same to control the rotational speed of an electric hand tool motor |
| US6713908B1 (en) * | 1998-03-31 | 2004-03-30 | California Institute Of Technology | Using a micromachined magnetostatic relay in commutating a DC motor |
| US10209286B2 (en) * | 2016-02-15 | 2019-02-19 | Ford Global Technologies, Llc | Resistance measurement tool |
| CN108436200B (en) * | 2018-05-13 | 2023-09-01 | 陕西理工大学 | Double-motor servo direct-drive screw extrusion device for large-lead nuts |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2931928A (en) * | 1956-08-30 | 1960-04-05 | Bliss E W Co | Torque transmitting mechanism |
| US3356874A (en) * | 1964-03-23 | 1967-12-05 | Royal Industries | Enclosed rotor drive device |
-
1970
- 1970-04-08 GB GB1250294D patent/GB1250294A/en not_active Expired
- 1970-04-10 US US27212A patent/US3626222A/en not_active Expired - Lifetime
- 1970-04-10 FR FR7013132A patent/FR2046190A5/fr not_active Expired
- 1970-04-13 JP JP45031486A patent/JPS5122604B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2046190A5 (en) | 1971-03-05 |
| DE1918637A1 (en) | 1971-02-11 |
| JPS5122604B1 (en) | 1976-07-10 |
| US3626222A (en) | 1971-12-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |