US2912084A - Speed changing transmissions for use in power presses and like machines - Google Patents

Speed changing transmissions for use in power presses and like machines Download PDF

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Publication number
US2912084A
US2912084A US488640A US48864055A US2912084A US 2912084 A US2912084 A US 2912084A US 488640 A US488640 A US 488640A US 48864055 A US48864055 A US 48864055A US 2912084 A US2912084 A US 2912084A
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US
United States
Prior art keywords
power
speed
shaft
machines
output shaft
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 - Lifetime
Application number
US488640A
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English (en)
Inventor
Meyercordt Fritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
L Schuler GmbH
Original Assignee
L Schuler GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by L Schuler GmbH filed Critical L Schuler GmbH
Application granted granted Critical
Publication of US2912084A publication Critical patent/US2912084A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B30B1/26—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 cams, eccentrics, or cranks
    • B30B1/266—Drive systems for the cam, eccentric or crank axis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19219—Interchangeably locked
    • Y10T74/19377—Slidable keys or clutches
    • Y10T74/19414—Single clutch shaft
    • Y10T74/19419—Progressive
    • Y10T74/19423—Multiple key
    • Y10T74/19428—Spur
    • Y10T74/19433—Fluid operated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19219—Interchangeably locked
    • Y10T74/19377—Slidable keys or clutches
    • Y10T74/19414—Single clutch shaft
    • Y10T74/1947—Selective
    • Y10T74/19474—Multiple key
    • Y10T74/19479—Spur gears
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets

Definitions

  • This invention relates to power presses, and more particularly to speed changing mechanisms for use in presses and like power-operated machines.
  • Still another object of the present invention is to provide means contributing to novel and improved mechanisms ensuring movement of a ram of a power press or like machine at a relatively greater speed during its return stroke than during its power stroke, which mechanisms may be used with power presses and like machines equipped with conventional constant-speed driving means Without necessitating any changes in the operational speed of the driving means to effect changes in ram speed.
  • a further object of the present invention is to provide means conducive to extremely efiicient speed varying mechanisms for power presses and like machines, which mechanisms are inexpensive to manufacture and maybe constructed for use with and for ready adaptation to existing machines, presses, and like power-operated aggregates.
  • Still a further object of the present invention is to provide means presenting highly effective, clutch-operated, speed changing mechanisms and transmissions for use with power presses and like machines, to be directly mounted on the frame of the latter so as to constitute an easily accessible connection between the power drive on the one hand and the power transmission means for the operating elements on the other hand.
  • One of the primary objects of the invention is, therefore, to overcome the aforesaid disadvantages inherent in the known drives for power presses or like machines and to provide means considerably improving function, operation and surveyance of such such presses while still employing electrical motor means and a flywheel as drive means.
  • the advantage is obtained that, despite the variation of operating speeds during any one cycle of the press, ordinary electric constantspeed motors can be employed in conjunction with a flywheel to actuate the press. No matter how great the variation in operating speed, the rotational speeds of the drive motor and the flywheel remain constant throughout the entire operating cycle.
  • the energy stored in the flywheel by virtue of the greater speed of the operating element during its return stroke is subsequently employed, after the speed is decreased, for aiding the operation of said element during its power stroke.
  • Fig. 1 is a schematic front view in elevation ofthe upper portion of a power press or like machine incorporating a speed varying transmission or mechanism embodying the present invention
  • Fig. 2 is a schematic top plan view of the mechanism of Fig. 1, certain parts being shown in section.
  • an electric drive motor 1 is mounted on and suitably affixed to the top of upper portion 18 of a power press frame.
  • a flywheel 2 is driven by motor 1 through V-belts 1', the flywheel being mounted on or otherwise connected to an input shaft 3 of the speed changing mechanism 17.
  • Aflixed to shaft '3 at spaced locations thereon are two gears 4 and 5.
  • An output shaft 6 is journaled in housing 17 of the speed changing transmission and extends parallel to input or counter-shaft 3.
  • Gears 7 and 8, which, together with gears 4 and 5, constitute the means for transmitting the motion of shaft 3 to shaft 6, are loosely disposed on drive shaft 6 so as to be freely rotatable thereon, gear 7 meshing with gear 5, and gear 8 meshing with gear 4.
  • gears 5 and 7 have the same diameter and number of teeth, while gear 8 has a considerably greater diameter than gear 4 and a correspondingly larger number of teeth.
  • the dimensions of the respective gears are so chosen that gear 8 is'dr'iven at'approximately half the rotational speed at which gears 4, 5, and 7 are driven.
  • the clutches are actuated by axial displacement of sleeves 29 and 29 which slidably surround shaft 6 and act on levers'30 and 30', respectively, these levers being pivotally supported on housings 9 and 10.
  • Displacement of sleeves 29 'and 29' is effected by means of suitable, preferably pneumatic pressure devices, which include pneumatic cylinders 13 and 14 disposed adjacent the ends of shaft 6 and connected to sources of air under pressure through pipes or conduits 13a and 14a, respectively.
  • Shaft 6 is provided with central bores 13 and 14 which extend therethrough to the housings of clutches 9 and 10, piston rods 13" and 14" being slidably arranged in said bores, respectively, and actuated by pistons 13b and 1% located within the cylinders.
  • These piston rods are connected to sleeves 29 and 29' by means of projections or like elements extending through transverse slots in the wall of shaft 6.
  • a disc-type brake, generally designated as 15, is provided on drive shaft 6 adjacent one end thereof, the fixed portion of the brake being mounted on an external support'31 Connectedto the brake housing, as by being threadedthereinto, is a pressure cylinder 32 in which a pressure piston 33 having a small displacement stroke is located. Piston 33 may be forced by means of compressed'airagainst springs 34, which ordinarily supply the braking forces, so as to lift the top disc or plate 15 of the brake from the remaining discs, thereby releasing the 'brake. A braking action on the shaft results when the compresed air is removed so as to permit springs 34 to press the top disc of the brake back against the remaining discs. 7
  • Gear 16 meshes with an intermediate gear 19 (see Fig. 1) disposed in press frame 18.
  • Gear 19 is fixedly connected to a pinion 20 disposed coa-xially therewith and which drives a gear 21 meshing in turn with a gear 22 of like diameter.
  • Pinion 23 drives a crank shaft 27 through an intermediate gear 25
  • pinion 24 drives a second crank shaft 28 disposed parallel to crank shaft 27 through an intermediate gear 26.
  • crank shafts 27 and 28 reach position [1 (see Fig. 1), which position indicates the end of the power stroke and the start of the return stroke, the pneumatic device 13-13" is automatically deactuated and pneumatic device 1414" actuated in its place, so that clutch plates 9'9f are disengaged and clutch plates 10'10" are brought into engagement. Thereafter, output shaft'6 is driven through gears and 7 at a relatively high rotational speed adapted for the return stroke of the ram or other operating element.
  • Releasing of the clutches upon deactuation of the pressure devices is effected in a known manner by means of return springs (not shown) acting on the movable clutch plates or by means of a reversal of the pressure applied to the pistons accomplished, for example, by manipulation of suitable reversing valves (not shown) interposed in the lines between the cylinders and the source of pressure.
  • the entire system is preferably so constructed that the time intervals between actuation of the pressure devices, corresponding to the periods of time required for the crank shafts to move from position a to position b and vice versa, are adjustable.
  • the principles of the present invention may further be so developed and modifi ed as to render them adaptable to implementation in connection with any press or like machine, whether the latter is driven continuously or with any desired number of single, interruptedcycles of operation.
  • a speed changing mechanism in accordance with the present invention may be applied to all types of power presses, such as stroke of the operating element of the press or machine at a lesser speed than that of the return stroke.
  • a speed changing mechanism for use in connection with an operating element of a power press and like machine equipped with a flywheel drive for said operating element; comprising input shaft means adapted to be driven unidirectionally by said flywheel drive, output shaft means drivingly connectable to said operating element, at least two motion transmission means operatively connected to said input shaft means and drivable by the latter at different, predetermined codirectional speeds, clutch means operatively connected to said motion transmission means and operable to selectively connect said motion transmission means to said output shaft means to thereby enable the latter to be driven at successive, predetermined codirectional speeds commensurate, respectively, with the respective speeds of said motion transmission means, whereby said operating element may be driven through said output shaft means at one predetermined speed during a first portion of its operating cycle and at another predetermined speed during a second portion of its operating cycle, brake means operatively disposed relative to said output shaft means and normally engaged with the latter to inhibit motion thereof upon deactuation of said clutch means, and releasing means operatively connected to said brake means for operating the latter to release said output shaft means
  • said brake means comprising a disc brake including plate-like braking elements and resilient means operatively connected to some of said braking elements to normally bias the latter i'nto braking action with respect to said output shaft means, said releasing means comprising fluid-operated piston and'cylinder means operatively connected to said resilient means and operable to counteract the braking forces engendered by said resilient means upon said braking elements.
  • a speed changing transmission comprising a housing, parallel input and output shafts journaled in said housing for unidirectional rotation, respectively, at least two input gears fixed at spaced locations on said input shaft for unidirectional and codirectional rotation therewith, at least two output gears loosely supported on and concentrically with said output shaft, each of said output gears meshing with a respective one of said input gears, said output gears having different diameters with regard to one another, whereby said output gears are driven with predetermined unidirectional and codirectional angular speeds different from one another, at least two clutches operatively connected, respectively, to said output gears and operable to selectively connect the latter to said output shaft to impart to the latter, respectively, said predetermined angular speeds, a brake having a first braking portion connected to said output shaft and rotatable therewith, a second braking portion fixed relative to said output shaft, and means operatively connected to one of said braking portions for selectively engaging and disengaging the same from the other braking portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
US488640A 1954-03-19 1955-02-16 Speed changing transmissions for use in power presses and like machines Expired - Lifetime US2912084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH14898A DE1141891B (de) 1954-03-19 1954-03-19 Presse, bei der die Leerwege beschleunigt durchfahren werden

Publications (1)

Publication Number Publication Date
US2912084A true US2912084A (en) 1959-11-10

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ID=7427351

Family Applications (1)

Application Number Title Priority Date Filing Date
US488640A Expired - Lifetime US2912084A (en) 1954-03-19 1955-02-16 Speed changing transmissions for use in power presses and like machines

Country Status (6)

Country Link
US (1) US2912084A (en(2012))
BE (1) BE535325A (en(2012))
CH (1) CH327071A (en(2012))
DE (1) DE1141891B (en(2012))
FR (1) FR1118397A (en(2012))
GB (1) GB769359A (en(2012))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3044318A (en) * 1958-12-31 1962-07-17 Utah Scient Res Foundation Drive mechanism for track laying vehicles
US3318425A (en) * 1963-06-13 1967-05-09 Mannesmann Meer Ag Driving mechanism for universal crankshaft extrusion presses
US3433086A (en) * 1967-07-12 1969-03-18 Us Industries Inc Multispeed driving mechanisms
US3498424A (en) * 1967-10-02 1970-03-03 Verson Mfg Co Multiple speed mechanical transmission system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304032A (en) * 1940-08-14 1942-12-01 Falk Corp Reversible multispeed drive
US2465942A (en) * 1942-12-18 1949-03-29 Gisholt Machine Co Headstock control mechanism for machine tools
US2557896A (en) * 1948-06-29 1951-06-19 Niles Bement Pond Co Control for change-speed mechanisms

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE417968C (de) * 1925-10-06 Siemens Schuckertwerke G M B H Antrieb fuer Blechscheren, Stanz-, Loch-, Praege- und aehnliche Maschinen mit Umkehrgetriebe
DE884278C (de) * 1941-07-17 1953-07-27 Weingarten Ag Maschf Mechanische Presse, insbesondere Ziehpresse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304032A (en) * 1940-08-14 1942-12-01 Falk Corp Reversible multispeed drive
US2465942A (en) * 1942-12-18 1949-03-29 Gisholt Machine Co Headstock control mechanism for machine tools
US2557896A (en) * 1948-06-29 1951-06-19 Niles Bement Pond Co Control for change-speed mechanisms

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3044318A (en) * 1958-12-31 1962-07-17 Utah Scient Res Foundation Drive mechanism for track laying vehicles
US3318425A (en) * 1963-06-13 1967-05-09 Mannesmann Meer Ag Driving mechanism for universal crankshaft extrusion presses
US3433086A (en) * 1967-07-12 1969-03-18 Us Industries Inc Multispeed driving mechanisms
US3498424A (en) * 1967-10-02 1970-03-03 Verson Mfg Co Multiple speed mechanical transmission system

Also Published As

Publication number Publication date
DE1141891B (de) 1962-12-27
FR1118397A (fr) 1956-06-05
GB769359A (en) 1957-03-06
BE535325A (en(2012))
CH327071A (de) 1958-01-15

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