GB2215242A - A head for machine tools having devices for automatically taking up play - Google Patents

A head for machine tools having devices for automatically taking up play Download PDF

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Publication number
GB2215242A
GB2215242A GB8804306A GB8804306A GB2215242A GB 2215242 A GB2215242 A GB 2215242A GB 8804306 A GB8804306 A GB 8804306A GB 8804306 A GB8804306 A GB 8804306A GB 2215242 A GB2215242 A GB 2215242A
Authority
GB
United Kingdom
Prior art keywords
head
machine tools
play
pinions
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.)
Withdrawn
Application number
GB8804306A
Other versions
GB8804306D0 (en
Inventor
Affaticati Artemio
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.)
Jobs SpA
Original Assignee
Jobs SpA
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 Jobs SpA filed Critical Jobs SpA
Priority to GB8804306A priority Critical patent/GB2215242A/en
Priority to DE19883809750 priority patent/DE3809750A1/en
Publication of GB8804306D0 publication Critical patent/GB8804306D0/en
Priority to FR8804286A priority patent/FR2629381B3/en
Publication of GB2215242A publication Critical patent/GB2215242A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/043—Accessories for spindle drives
    • 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
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • B23Q5/58—Safety devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)
  • Manipulator (AREA)
  • Jigs For Machine Tools (AREA)

Description

A HEAD FOR MACHINE TOOLS HAVING DEVICES FOR AUTOMATICALLY-TAKING UP PLAY
This invention proposes a head for machine tools with devices for automatically taking up play.
More particularly it relates to a head for n e-1 , z 1 5 -2 41 2 automatic machine tools which comprises a fork mounted on a support which can be moved about a plurality of axes, between the arms of which is located a support for a chuck mounted in such a way that it can rotate.
The mechanism P-'.,:fecting rotation cl' the said support is of such a nature that it ensures that play is automatically taken up as well as conferring greater rigidity upon the whole.
With the development of industrial automation, automatic machine tools, also known as robots, which are capable of carrying out a sequence of even complex operations in a completely automatic way and are capable of servinz a plurality of other machines on the basis Df' repetitive cycles without the need for intervention by the operator, are becoming increasingly widespread.
In this type of machine tools are mounted on a head fixed at the end of a movable arm which has several degrees of freedom.
One of the m----jor problems encountered in the des-4cn of this type of equipment is that of keeping dimensions as small as possible in order that machining operations may also be performed within workpieces without excessive difficulty.
A head of the type mentioned above is described in patent 2162936 B by the same applicant. This heed has a special arrangement of ducts for the removal of dust whereby an extremely compact unit is obtained.
is 2D In this, as in other known heads, rotation Dfl the chuck support is controlled by means of an endless screw, which engages a toothed quadrant which is integral with the shaft whereby the said support is mounted on the fork.
These known devices have however a number of disadvantages due in particular to the need to perform maintenance and/or adjustments at intervals in order to take up the play due to wear of the various components In order to overcome the above mentioned disadvantage this invention proposes a head for machine tools in which rotation of the chuck support occurs as the result of a mechanism throuQh which play is automatically taken up through the special conformation and arrangement of the parts.
This arrangement ais,-n cEns-JdErably increases the structure and provides increased the ricidity c, efficiency.
The invention will now be described in detail with particular reference to the appended figures in which:
Figure 1 shows a perspective view ol a head according to the invention; Figure 2 illustrates a head accordinz-, to the -'ion; and invention viewed from above in partial croSS-SE-L i v l> Y Figure 3 shows a section along the line P-A in Figure 2.
The head according to the invention substantiallv comprises a fDrk 1 attached to a movable support, which is not illustrated as it is of a known type, between the arms of which a unit 2, supporting a chuck 3, is mounted.
Support 2 can rotate about axis X-X and this movement is controlled by a motor (not shown) placed within fork 1.
The mechanism which transmits the motion to support 2 is illustrated in Figures 2 and 3.
The motion is transmitted to a pulley 4 mounted on a shaft 5 to which is keyed a pinion 6, which Engages a gearwheel 7.
A pair of pinions 9 and 10 having oppDsinE helical threads are mounted on shaft 8 of gearwheel 7.
Shaft 6, and with it pinions 9 and 1E, may make limited axial displacements against the force exerted by a helical spring or the like 11.
Pinions 9 and 10 likewise engage gearwheels 12 and 13, to tine shafts D17 which are keyed pinions 14 and 15, which both ensage a gearwheel 16, which is integral with chuck support 2.
Movement, derived from the motor via pulley 4, pinion 6 and gearwheel 7, is transmitted to the pair of pinions 9 and 10, which have opposite helical gear-ing.
These cause gearwheels 12 and 13 to rotate respectively, which, in turn, rotates pinions 14 and 15. The latter two both engage gearwheel 16, which is integral with chuck support 2, which is thus caused to rotate.
is The force exerted by spring 11 presses against shaft B on which pinions 9 and 10 are mounted, keeping the teeth of the latter pressed against the corresponding teeth of gearwheels 12 and 13 and thus automatically taking up any play which may occur as a result of wear of the parts.
For initial adjustment at the time of the assembly the securing devices of gearwheel 12 are removed and while pressing shaft B in such a way as to compress spring 11, the said gearwheel 12 is rotated until the teeth of pinions 9 and 10 engage the corresponding teeth of, gearwheels 12 and 13.
At this point gearwheel 12 is secured on its own shaft and shaft B is released, spring 11 pressing it back axially to take up any play as described above.
The mechanism illustrated makes it possible to achieve other not insignificant advantages: above all a unit which has appreciably greater rigidity than known mechanisms is obtained, although the same dimensions are retained. High reduction ratios of the order of 1/300 may be obtained, appreciably increasing the efficiency of the device (which is close to 7511c' asainst the 35% of previous devices), and finally increasing the dynamic services of the system.
Obviously the dimensions and the materials used may be varied in accordance with operating requirements.
e' 1.J.

Claims (3)

  1. CLAIMS is 1. A head for machine tools of the type comprising a fork on
    which a chuck support is mounted, in which a mechanism which automatically takes up play is provided to control rotation of the said chuck support.
  2. 2. A head for machine tools according to claim 1, in which the said mechanism comprises a shaft which is capable of axial displacement against biasing means, on which are mounted a pair of pinions with opposite helical threads which engage similar gearwheels in turn mounted on shafts to which are keyed pinions, which simultaneously engage a further gearwheel integral with the shaft of the said chuck support.
  3. 3. A head for machine tools substantially as herein described with reference to the accompanying drawings.
    Published 1989 atThe Patent Office. State House, 66"71 High Holborn, London WClR4TF. Further copies maybe obtained from The Patent Office Sales Branch, St Mary Cray, Orpington, Kent BRS 3RD. Printed by Multiplex techniques ltd, St Max7 Cray, Kent, Con. 1/87
GB8804306A 1988-02-24 1988-02-24 A head for machine tools having devices for automatically taking up play Withdrawn GB2215242A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB8804306A GB2215242A (en) 1988-02-24 1988-02-24 A head for machine tools having devices for automatically taking up play
DE19883809750 DE3809750A1 (en) 1988-02-24 1988-03-23 HEAD FOR MACHINE TOOLS WITH EQUIPMENT FOR AUTOMATIC COMPENSATION
FR8804286A FR2629381B3 (en) 1988-02-24 1988-03-31 HEAD FOR MACHINE TOOLS WITH AUTOMATIC GAME COMPENSATION MECHANISM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8804306A GB2215242A (en) 1988-02-24 1988-02-24 A head for machine tools having devices for automatically taking up play

Publications (2)

Publication Number Publication Date
GB8804306D0 GB8804306D0 (en) 1988-03-23
GB2215242A true GB2215242A (en) 1989-09-20

Family

ID=10632280

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8804306A Withdrawn GB2215242A (en) 1988-02-24 1988-02-24 A head for machine tools having devices for automatically taking up play

Country Status (3)

Country Link
DE (1) DE3809750A1 (en)
FR (1) FR2629381B3 (en)
GB (1) GB2215242A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004016401A1 (en) * 2002-08-19 2004-02-26 Abb Ab A robot wrist comprising a drive unit incorporated in a tilt
CN103072022A (en) * 2013-01-17 2013-05-01 万向钱潮传动轴有限公司 Earhole broaching clamp of fork parts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1135512A (en) * 1966-07-21 1968-12-04 Jack Binns Anti-backlash carriage feed mechanism
EP0041136A1 (en) * 1980-05-29 1981-12-09 KUKA Schweissanlagen GmbH Pivot drive for swingably supported machine parts, especially suited for manipulators
GB2135270A (en) * 1983-01-26 1984-08-30 Mitsubishi Electric Corp Articulation mechanism of arc welding robot
EP0121063A1 (en) * 1983-03-09 1984-10-10 KUKA Schweissanlagen GmbH Adjustable pivot drive without play for at least one main axle of a manipulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1135512A (en) * 1966-07-21 1968-12-04 Jack Binns Anti-backlash carriage feed mechanism
EP0041136A1 (en) * 1980-05-29 1981-12-09 KUKA Schweissanlagen GmbH Pivot drive for swingably supported machine parts, especially suited for manipulators
GB2135270A (en) * 1983-01-26 1984-08-30 Mitsubishi Electric Corp Articulation mechanism of arc welding robot
EP0121063A1 (en) * 1983-03-09 1984-10-10 KUKA Schweissanlagen GmbH Adjustable pivot drive without play for at least one main axle of a manipulator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004016401A1 (en) * 2002-08-19 2004-02-26 Abb Ab A robot wrist comprising a drive unit incorporated in a tilt
CN103072022A (en) * 2013-01-17 2013-05-01 万向钱潮传动轴有限公司 Earhole broaching clamp of fork parts
CN103072022B (en) * 2013-01-17 2015-06-17 万向钱潮传动轴有限公司 Earhole broaching clamp of fork parts

Also Published As

Publication number Publication date
FR2629381A1 (en) 1989-10-06
DE3809750A1 (en) 1989-10-05
FR2629381B3 (en) 1990-07-13
GB8804306D0 (en) 1988-03-23

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)