US3550378A - Hydromechanic controls for automatic machine tools and more particularly for automatic lathes - Google Patents

Hydromechanic controls for automatic machine tools and more particularly for automatic lathes Download PDF

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Publication number
US3550378A
US3550378A US798917A US3550378DA US3550378A US 3550378 A US3550378 A US 3550378A US 798917 A US798917 A US 798917A US 3550378D A US3550378D A US 3550378DA US 3550378 A US3550378 A US 3550378A
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US
United States
Prior art keywords
piston
control
automatic
pressure
pressure chamber
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
US798917A
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English (en)
Inventor
Siegfried Puck
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.)
HUGO KARRENBERG AND SOHN KG
Original Assignee
HUGO KARRENBERG AND SOHN KG
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
Priority claimed from DE19681652691 external-priority patent/DE1652691A1/de
Application filed by HUGO KARRENBERG AND SOHN KG filed Critical HUGO KARRENBERG AND SOHN KG
Application granted granted Critical
Publication of US3550378A publication Critical patent/US3550378A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/045—Compensating for variations in viscosity or temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B7/00—Automatic or semi-automatic turning-machines with a single working-spindle, e.g. controlled by cams; Equipment therefor; Features common to automatic and semi-automatic turning-machines with one or more working-spindles
    • B23B7/02—Automatic or semi-automatic machines for turning of stock
    • B23B7/10—Accessories, e.g. guards

Definitions

  • An open hydraulic-mechanic system for controlling automatic machine tools such as automatic lathes comprises a hydraulic medium reservoir which is open to the surrounding atmosphere and a feed line containing a control piston such that when the control piston is in its withdrawn position the hydraulic medium has access to the pressure chamber of the control cylinder through the wall of the control cylinder via a recess in the control piston.
  • the present invention relates to a hydromechanical control for automatic machine tools and more particularly for automatic lathes, in which a control cam acts upon the control piston of the hydraulic medium via a lever gear.
  • the present invention provides for the hydraulic medium a reservoir which is open towards the surrounding air and has a feed line towards the cylinder containing the control piston so that, with the control piston in its withdrawn position, the hydraulic medium, on the side not facing the pressure side of the piston, has access to the pressure chamber of the control cylinder with the control piston in its withdrawn position through the wall of the control cylinder via an opening of the control piston which is connected to the reservoir.
  • connection opening to the pressure chamber has a comparatively small diameter only. This is favorable in that the connection opening does not result in any remarkable empty stroke of the control piston.
  • design may be such that the housing comprising the control cylinder is provided with a longitudinal chamber at the control cylinder which is connected to the reservoir containing the hydraulic medium and that the longitudinal chamber is provided with a connection through an opening in the wall of the control cylinder with a longitudinal chamber formed by a recess of the control piston on the side not facing the pressure chamber of the control cylinder and that the pressure chamber of the control cylinder is provided with a connection with the longitudinal chamber of the housing which is located at the withdrawn position of the control piston.
  • the return force may be adjustable, even fine adjust ment will be possible using a weight or a spring.
  • the arrangement exerting the return force may be in the form of a double armed lever, one arm of which acting upon the pin and the other arm being loaded by a force or weight and acting upon a limit switch.
  • a possible relief of the system will be achieved by providing a direct connection to the reservoir for the hydraulic medium at he pressure chamber of the control cylinder which connection may be established in cases of necessity.
  • This means of relief is favorable in that the working piston may be returned independently into its original or neutral position by opening the connection to the reservoir. This may be useful if control and working pistons, for instance, due to tool or machine breakage, are not in their original positions, because it will not be necessary to return the control piston via the control cam into its original position. After the connecting relief bore has been closed in the neutral position, the former extent of movement of the working piston is resumed in the new working cycle without additional manipulation.
  • a return force acting upon the working piston is provided in the form of a spring.
  • the present invention may be used advantageously for the transmission of forces and movements in automatic mechanisms and specifically in automatic lathes.
  • the cam disc 1 which acts upon the swivelling lever 2, serves to produce the control movement.
  • the lever 2 is provided with a roller 2' for the attack of the disc 1.
  • the lever 2 transfers its movement to a tappet 3. It is provided with three points of attack A, B, and C for a contact with the end of the tappet, by means of which a change in the transmission ratio is achieved. Depending upon the point of contact the transmitted movement will be smaller or greater.
  • a spring element 4 may be provided in the tappet to produce an excess pressure for clamping operations.
  • Via an adjustment screw 5 the tappet 3 acts upon a lever 6 one end of which acting upon the control piston 7.
  • the control piston 7 is provided in a control cylinder 8 and adapted to be displaced in the latter. At the immersing end of the control piston 7 a packing 9 has been provided.
  • the control cylinder 8 is located in a housing 10.
  • a chamber 11 surrounding the control cylinder 8 is established between the ends of the housing 10.
  • the chamber 11 is connected with the pressure oil reservoir 12 the top of which is open.
  • a recess 13 is provided at the control piston in front of its pressure end, said recess being connected through the bore 14 in the wall of the control cylinder with the longitudinal chamber 11.
  • a second bore 15 connects the pressure chamber 28 of the control cylinder with the chamber 11 when the control piston 7 is withdrawn or is in its original position respectively. In the original position of the piston 7 pressure oil is free to flow into the pressure chamber 28.
  • the bore 15 has a small diameter only and is located closely below the packing 9 in the original position of the piston 7.
  • the packing 9 seals the pressure chamber 28 off against the longitudinal chamber 11 when overrunning the bore 15 and presses the pressure oil via the line 16 into the working piston 17.
  • the working piston 18 which is displaced towards the outside in an exactly reversed relationship between control piston surface and the working piston surface.
  • the pressure oil acts as a rigid transmission element. Since after completion of a working cycle the next cycle starts again in the original position with the control piston, the pressure oil is able to level up prior to the star of a new cycle.
  • the bottom of the control cylinder 8 there is a piston pin 20 which is sealed by the packing 19.
  • the piston pin 20 is supported on one end of a pivoted lever 21 the other arm of which is loaded, corresponding to the desired safety, with the working pressure which may occur increased by an additional safety load.
  • the extend may be adjusted very exactly by means of a spring or a weight. In the case of any excess pressure resulting from a fault in the system the piston pin is moved towards the outside and presses upon one arm of the lever 21. The lever 21 swivels and, by this movement, actuates a limit switch 22 and the coupling 23 to suddenly interrupt the cycle.
  • the spring 27 is responsible for the return of the control piston 7.
  • a hydromechanical control mechanism for controlling a pressurized flow to a working piston comprising:
  • control piston being positioned within a control cylinder containing a hydraulic medium in a pressure chamber therein,
  • said stopping means includes means for varying the pressure on said other end of the piston pin.
  • said stopping means includes a lever having a pair of arms, wherein said piston pin acts on one arm, the other arm cooperating with a limit switch.
  • a mechanism as defined in claim 1 including a direct connection means between said pressure chamber and said liquid reservoir adjacent the bottom of said pressure chamber, and means therein for opening said connection means when a predetermined pressure is reached in said pressure chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Hydraulic Motors (AREA)
US798917A 1968-02-13 1969-02-13 Hydromechanic controls for automatic machine tools and more particularly for automatic lathes Expired - Lifetime US3550378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681652691 DE1652691A1 (de) 1968-02-13 1968-02-13 Hydromechanische Steuerung fuer automatische Arbeitsmaschinen,insbesondere Drehautomaten

Publications (1)

Publication Number Publication Date
US3550378A true US3550378A (en) 1970-12-29

Family

ID=5685032

Family Applications (1)

Application Number Title Priority Date Filing Date
US798917A Expired - Lifetime US3550378A (en) 1968-02-13 1969-02-13 Hydromechanic controls for automatic machine tools and more particularly for automatic lathes

Country Status (4)

Country Link
US (1) US3550378A (enrdf_load_stackoverflow)
CH (1) CH483293A (enrdf_load_stackoverflow)
FR (1) FR2001821A1 (enrdf_load_stackoverflow)
GB (1) GB1234681A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590765A (en) * 1984-07-23 1986-05-27 Automotive Products Plc Hydraulic cylinder modular structure

Also Published As

Publication number Publication date
CH483293A (de) 1969-12-31
GB1234681A (enrdf_load_stackoverflow) 1971-06-09
FR2001821A1 (enrdf_load_stackoverflow) 1969-10-03

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