GB1345580A - Machine tool and control system therefor - Google Patents

Machine tool and control system therefor

Info

Publication number
GB1345580A
GB1345580A GB2341471*A GB2341471A GB1345580A GB 1345580 A GB1345580 A GB 1345580A GB 2341471 A GB2341471 A GB 2341471A GB 1345580 A GB1345580 A GB 1345580A
Authority
GB
United Kingdom
Prior art keywords
valve
air
saw
power consumed
saw blade
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
Application number
GB2341471*A
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.)
FRIK SAW MACHINERY Ltd
Original Assignee
FRIK SAW MACHINERY Ltd
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 FRIK SAW MACHINERY Ltd filed Critical FRIK SAW MACHINERY Ltd
Publication of GB1345580A publication Critical patent/GB1345580A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/08—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of devices for bringing the circular saw blade to the workpiece or removing same therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/04—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever
    • B23D45/042—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/04—Arrangements preventing overload of tools, e.g. restricting load

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

1345580 Rotary saws FRIK-SAW MACHINERY Ltd 19 April 1971 [9 March 1970] 23414/71 Heading B5L [Also in Division G3] A control system for a machine tool, such as a rotary saw blade 8 which is moved relative to a workpiece 5 by a pivoted arm 6, comprises means to monitor the power consumed by the saw and means to reverse the advance movement when the power consumed exceeds a predetermined level and to resume the advance movement when the power consumed falls below the predetermined level or another lower level. In the described embodiment a signal representative of the power consumed is provided by a current transformer 15 which senses the current taken by the A.C. electric motor 7 driving the saw blade 8. Advance and reversal of the saw blade is produced by a pneumatic system comprising a main air distributer 32, a spring-loaded valve 21 controlled by an electrically-actuated valve 18, a two-position valve 22 whose state is dependent on which of its ends S1, S2 is supplied with air, and a piston 41 which is connected to the arm 6 and is movable in a cylinder 37 in a direction dependent on the application of air to a needle valve 35 or 40, the unsupplied one of which is connected to exhaust. In a typical working stroke, actuation of a start valve 44 causes air to be applied to end S1 of valve 22 and hence to the valve 40, the piston 41 moving to advance the saw blade 8 at a speed determined by the valves 35, 40. If the motor current exceeds a predetermined value, the output of transformer 15 actuates a relay 17 so causing the valve 18 to be deenergized. This action removes the air supply to end S1 of valve 21, whose spring 31 alters the valve position to cause air to be supplied to the valve 35 and the valve 40 to be connected to exhaust, thus reversing the piston movement. When the motor current falls below the predetermined value, the previously described operation is reversed. At the end of the working stroke, an abutment 47 engages a roller valve 48 whose operation causes air to be applied to the end S2 of the valve 22, so reversing the condition of the valves 35, 40 and the piston movement. Closure of a link 52 short circuits the transformer 15 to allow manual control of the saw.
GB2341471*A 1970-03-09 1971-04-19 Machine tool and control system therefor Expired GB1345580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA701600A ZA701600B (en) 1970-03-09 1970-03-09 A method of and control system for a machine tool

Publications (1)

Publication Number Publication Date
GB1345580A true GB1345580A (en) 1974-01-30

Family

ID=25561781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2341471*A Expired GB1345580A (en) 1970-03-09 1971-04-19 Machine tool and control system therefor

Country Status (4)

Country Link
AU (1) AU2628171A (en)
DE (1) DE2111388A1 (en)
GB (1) GB1345580A (en)
ZA (1) ZA701600B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2360832A1 (en) * 2010-01-25 2011-08-24 ABB Oy Control method for frequency converter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109926648B (en) * 2018-02-01 2020-04-10 诸葛小莲 Secondary cutting mechanism for electric power anchor rod and cutting equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2360832A1 (en) * 2010-01-25 2011-08-24 ABB Oy Control method for frequency converter
US8581532B2 (en) 2010-01-25 2013-11-12 Abb Oy Control method for frequency converter

Also Published As

Publication number Publication date
ZA701600B (en) 1971-05-27
DE2111388A1 (en) 1971-09-30
AU2628171A (en) 1972-09-14

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees