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
  • B30B15/0023—Drive arrangements for movable carriers, e.g. turntables
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
  • B23Q16/02—Indexing equipment
  • B23Q16/04—Indexing equipment having intermediate members, e.g. pawls, for locking the relatively movable parts in the indexed position
  • B23Q16/06—Rotary indexing

Definitions

• Stepper drive e.g. for the die holder of a press for producing bolts from wire sections
• the invention relates to a stepper drive, which e.g. can be used as a drive for the rotatably mounted die holder of a press, in particular a press for producing bolts from wire sections.
• the die holder is connected or connectable in a rotationally fixed manner to a gearwheel-like drive means; furthermore, a rack-like drive means is assigned to the gearwheel-like drive means; finally, actuated drive elements on the rack-like drive means in synchronism with the rotary movement of the main drive shaft of the press for reciprocating drive of the rack-like drive means in the direction of the longitudinal extension of this drive means and in a direction transverse thereto, with a movement in the direction of the longitudinal expansion of the rack-like drive means Drive means is followed by movement transversely thereto so that the rack-like drive means is in drive connection during a movement in the longitudinal direction and during the subsequent opposite movement in the longitudinal direction out of drive connection with the gear-like drive means of the die holder; and finally, locking means are associated with the die holder for locking the die holder between successive, identical turning steps of the die holder.
• a preferred embodiment of the drive according to the invention consists, according to the proposal of claim 2, in that the drive elements for the reciprocating drive of the rack-like drive means consist of a swivel-mounted double-arm lever with tapping rollers which rotate in drive connection with a synchronous with the main drive shaft of the press Double cam disc; that the drive elements for the reciprocating drive of the rack-like drive means in a direction transverse to the longitudinal expansion of the rack-like drive means from a guide for the rack-like drive means and one with this guide in the plane of motion of the rack-like type drive means articulated, in the press frame pivotally mounted lever with tapping roller, which is in drive connection with another, rotating synchronously with the main drive shaft of the press cam; and that, finally, the cams for driving the rack-like drive means or the lever carrying the guide for the rack-like drive means have such curves and are rotationally offset with respect to the main drive shaft of the press such that the rack-like drive means each have a predetermined angle of rotation Main drive shaft is brought and held alternately in and out
• the main advantage of the drive according to the invention compared to previously known drives for rotatably mounted die holder can be seen in the fact that a positive drive connection is provided between the main drive shaft of the press and the rotatably mounted die holder for driving it in successive, identical turning steps.
• This form-fitting drive connection enables high accelerations and correspondingly high decelerations of the rotary movements of the die holder without the positioning accuracy of the die holder suffering. Because the forces resulting from the inertia of the die holder, which is to be set in rotation and braked again, are conducted into the main drive shaft of the press and into the drive motor due to the positive connection of the drive connection.
• the drive according to the invention therefore allows relatively high switching frequencies of the die holder without the work result suffering. It also ensures that the movements of the die holder in relation to the movements of the others Press elements such as edgers, ejectors etc., which are also driven by the main drive shaft of the press, are always in the intended synchronism.
• claim 3 proposes that transmission means also act on the lever carrying the guide for the rack-like drive means for controlling a locking pin and that recesses in the tool holder or die holder associated with the adjacent end of the locking pin for locking the tool holder or Die holder are provided.
• Fig. 1 shows the drive according to the invention for a rotatably mounted die holder in a schematic representation in front view
• Fig. 2 shows the drive of FIG. 1 also in a schematic representation in plan view in section.
• a die holder 2 with dies 3, 4 and 5 is rotatably mounted in a press frame designated 1 in the drawing.
• Rolling element bearings 6 and 7 are provided for mounting the die holder 2.
• the rolling element bearing 6 is supported on the press frame 1, the rolling element bearing 7 on a fixed bearing 8 that is firmly connected to the press frame 1.
• Ejector pins 9, 10 and 11 are assigned to the die holder 2 with the dies 3, 4 and 5.
• a carriage 12 is provided in the press frame 1, which carries punches 13, 14 and 15.
• the carriage 12 is slidably guided in a guide 16 of the press frame 1.
• a crankshaft 17 is provided which engages via a crank rod 18 on a bolt 19 mounted in the carriage 12.
• crankshaft 17 is in drive connection via a gearwheel 20 with a gearwheel 21, which is rotatably mounted on the main drive shaft 22.
• a gear 23 is attached to which a rack 24 is assigned.
• the rack 24 is longitudinally displaceable in a guide 25 guided.
• the guide 25 is supported parallel to the longitudinal extension of the toothed rack 24 by means of an articulated rod 26 on a fixed bearing, not specified in more detail.
• the guide 25 is supported via an articulated rod 27 on one end of a lever 28, designated 30.
• the lever 28 is pivotally mounted in the press frame 1 about a stationary axis 29.
• an articulated rod 32 engages, which is in drive connection with a locking pin 35 via an angle lever 34 which is pivotably mounted about a fixed axis 33.
• the locking pin 35 is guided in a longitudinally displaceable manner in a guide 36 provided in the press frame 1.
• Recesses 38, 39 and 40 provided in die holder 2 are assigned to the end of locking pin 35, designated 37.
• the recesses 38, 39 and 40 are provided at the same, same angular intervals in the die holder 2 as the dies 3, 4 and 5 are arranged on or in this. are.
• the rack 24 is connected in an articulated manner to an arm 42 of a double-arm lever 42, 43 by means of a bolt 71 mounted at the end denoted by 41.
• the double arm lever 42, 43 can be pivoted about an axis 44 which is mounted in the press frame 1 in a stationary manner.
• the arm 42 of the double arm lever 42, 43 carries a tapping roller 45
• the arm 43 of the double arm lever 42, 43 carries a tapping roller 46
• the tapping rollers 45 and 46 run on the cam plates 47 and 48 of the double cam plates 47, 48.
• the double cam plates 47, 48 is rotatably connected to a shaft 50.
• the shaft 50 is rotatably supported in bearings 51, 52 and 53 attached to the press frame 1.
• a bevel gear 54 is connected in a rotationally fixed manner to the shaft 50 and is in drive connection with the main drive shaft 22 via a bevel gear 55.
• the lever 28 carries a tapping roller 56 which runs on a cam plate 57.
• the lever 28 is under the influence of a spring 59 which presses the tapping roller 56 against the cam plate 57.
• the cam plate 57 is rotatably connected to a shaft 58, which is also in a positive connection with the main drive shaft 22 in a manner not shown.
• the drive is at the beginning of a rotational acceleration of the die holder 2 in the sense indicated in the direction of arrow 60.
• the cams 47, 48 and 57 rotate uniformly in the direction of rotation indicated by the arrows 61 and 62.
• the tapping roller 56 of the lever 28 is at this point in time at the beginning of an upper curve region 63 which is concentric with the shaft 58, the tapping roller 46 of the arm 43 of the double arm lever 42, 43 is at the end of a lower curve region 64 which is concentric with the shaft 50 Cam 48 or at the beginning of an increasing cam portion 65 of this cam 48.
• the locking pin 35 is inserted from the lever 28 with its end 37 into the relevant recess of the die holder 2, in the present case into the recess 39, via the articulated rod 32 and the angle lever 34 the die holder 2 is locked during the subsequent machining process of the workpieces located in the dies.
• the tapping roller 56 of the lever 28 runs on the lower curve region 68 of the cam plate 57, which is concentric with the shaft 58, and the tapping roller 46 of the arm 43 of the double arm lever 42, 43 runs on the descending curve area 69 of the cam disk 48.
• the falling curve area 69 of the cam disk 48 is assigned a specific curve area on the cam disk 47, which curve areas are not individually identified for reasons of clarity.
• the rack 24 is already brought into engagement with the gear 23 before the acceleration of the die holder 2 is started and that the rack 24 is only brought out of engagement with the gear 23 when the die holder 2 stops after deceleration to the rotational speed zero.
• the locking pin 35 is already in the relevant recess 38, 39 or 40 of the die holder before the rack 24 is brought out of engagement with the gear 23, so that an uncontrolled rotation of the die holder is prevented.
• the drive according to the invention is of course not limited to an application in presses of the type described, but it can also be used to advantage for the step-by-step drive of conveyor belts, rotating work tables and the like.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Mounting, Exchange, And Manufacturing Of Dies (AREA)
• Forging (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6070668

Family Applications (1)

Country Status (3)

Citations (12)

Family Cites Families (2)

• 1979
  • 1979-05-14 DE DE2919345A patent/DE2919345C2/de not_active Expired
• 1980
  • 1980-05-13 WO PCT/DE1980/000066 patent/WO1980002530A1/de unknown
  • 1980-05-14 IT IT22030/80A patent/IT1131804B/it active

Patent Citations (12)

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