BE1024721B1 - SELF-CONTAINING CHUCK AND ROTARY MACHINE EQUIPPED WITH SUCH CHUCK - Google Patents

Abstract

The present invention relates to a mandrel (1) comprising a circular front flange (10), a rear circular flange connectable to a rotation pin (not shown) drivable by an electric motor, three jaws mounted on corresponding jaw holders, a means translation device corresponding to each jaw holder, the front flange (10) comprising three radial guide grooves (11) of the jaw holders, a coaxial flywheel (100) being mounted on the rear flange so as to be rotatable relative to that and having on its periphery a toothed or circumferential toothed surface capable of interacting with three adjustment gears each of which is integral with an adjustment axis so as to rotate it, each adjustment axis connecting the front and rear flanges and having a thread of worm which interacts by means of an angle gear with a jaw carrier translation means. Said jaw carrier translation means comprises a cylinder integral with each of the flanges and a piston guided in said cylinder and mounted by means of a nut on a threaded rod whose end opposite the piston comprises the angular gear. The invention also relates to a machine equipped with at least one of these mandrels.

Description

(30) Priority data:

(73) Holder (s):

DONIS Philippe 4360, OREYE Belgium

GéRADON Henri 4300, WAREMME Belgium (72) Inventor (s):

DONIS Philippe 4360 OREYE Belgium

GéRADON Henri 4300 WAREMME Belgium (54) SELF-CENTERING CHUCK AND ROTARY MACHINE EQUIPPED WITH SUCH A CHUCK (57) The present invention relates to a mandrel (1) comprising a front circular flange (10), a rear circular flange connectable to a rotation pin (not shown) driven by an electric motor, three jaws mounted on corresponding portemors, a means of translation corresponding to each jaw holder, the front flange (10) comprising three radial guide grooves (11) of the jaw holders, a coaxial flywheel (100) being mounted on the rear flange so as to be able to rotate relative to the latter and having on its periphery a circumferential toothed or notched surface capable of interacting with three adjusting pinions each secured to a setting adjusting axis so as to rotate it, each adjustment axis connecting the front and rear flanges and having a worm thread which interacts by means of a return gear i angle with a means of translation of the jaw holder. Said translation means of portemors comprises a cylinder integral with each of the flanges and a piston guided in said cylinder and mounted by means of a nut on a threaded rod whose end opposite to the piston comprises the angle gear. The invention also relates to a machine equipped with at least one of these mandrels.

BELGIAN INVENTION PATENT

FPS Economy, SMEs, Middle Classes & Energy

Publication number: 1024721 Deposit number: BE2016 / 5835

Intellectual Property Office International Classification: B23B 31/16 Date of issue: 06/14/2018

The Minister of the Economy,

Having regard to the Paris Convention of March 20, 1883 for the Protection of Industrial Property;

Considering the law of March 28, 1984 on patents for invention, article 22, for patent applications introduced before September 22, 2014;

Given Title 1 “Patents for invention” of Book XI of the Code of Economic Law, article XI.24, for patent applications introduced from September 22, 2014;

Having regard to the Royal Decree of 2 December 1986 relating to the request, the issue and the maintenance in force of invention patents, article 28;

Given the patent application received by the Intellectual Property Office on 08/11/2016.

Whereas for patent applications falling within the scope of Title 1, Book XI of the Code of Economic Law (hereinafter CDE), in accordance with article XI. 19, §4, paragraph 2, of the CDE, if the patent application has been the subject of a search report mentioning a lack of unity of invention within the meaning of the §ler of article XI.19 cited above and in the event that the applicant does not limit or file a divisional application in accordance with the results of the search report, the granted patent will be limited to the claims for which the search report has been drawn up.

Stopped :

First article. - It is issued to

DONIS Philippe, Rue de la Centenaire 17 / a, 4360 OREYE Belgium;

GéRADON Henri, Rue de Grand-Axhe 54, 4300 WAREMME Belgium;

represented by

BOSCH Henry, Square Marie Louise 40 box 19, 1000, BRUXELLES;

COLENS Alain, Square Marie Louise 40 Box 19, 1000, BRUXELLES;

a Belgian invention patent with a duration of 20 years, subject to the payment of the annual fees referred to in article XI.48, §1 of the Code of economic law, for: SELF-CENTERING CHUCK AND ROTARY MACHINE EQUIPPED WITH SUCH A MANDREL.

INVENTOR (S):

DONIS Philippe, Rue de la Centenaire 17 / a, 4360, OREYE;

GéRADON Henri, Rue de Grand-Axhe 54, 4300, WAREMME;

PRIORITY (S):

DIVISION:

divided from the basic application: filing date of the basic application:

Article 2. - This patent is granted without prior examination of the patentability of the invention, without guarantee of the merit of the invention or of the accuracy of the description thereof and at the risk and peril of the applicant (s) ( s).

Brussels, 06/14/2018, By special delegation:

BE2016 / 5835

A.UTOCENTRANT MANDREL AND ROTARY MACHINE EQUIPPED WITH SUCH

MANDREL

0 01 '

The present invention relates to rotary machines of the machine tool type and relates more particularly to a self-centering mandarin as well as to a machine co-supporting at least one mandrel according to the invention.

The mandrels are mounted at the end of the rotating shaft of a rotary machine, such as a lathe or a drilling machine, in order to hold either a workpiece by removing material, or a rotary tool, such as a drill bit or a drill. By analogy with wood lathes and lathes for machining mechanical parts, rotary machines equipped with mandrels are also used for hot forming of round glass. In this case, towers with a horizontal axis and a hollow spindle are used more particularly. The lathe can be equipped with two heads each carrying a spindle, preferably hollow, driven by an electric motor, and a mandrel generally comprising three jaws whose clamping is ensured manually by an operator.

In the case of two heads, one of the heads is fixed on the machine frame while the other can be moved along the axis of the machine and is adjusted according to the length of the part to be supported and work . It is understood that in this case, it is necessary to provide an appropriate synchronization of the drive motors in order to avoid breakage of the supported part.

Known mandrels, especially in the glass industry, are based on tightening the mandrel jaws by guiding them on a spiral path. This

BE2016 / 5835 technical nevertheless generates design and production difficulties and is a source of wear and breakdowns. Furthermore, these known mandrels have a large mass since the spiral guide pitch is generally made of cast iron and must withstand fairly large forces. The high weight requires an adequate motorization with a dimensioning making it possible to overcome the inertia, in particular within the framework of the synchronization of two heads mounted on a same machine and comprising individual servo-controlled motors.

It should also be noted that the manufacture of guide steps does not spiral, generally by molding, is expensive, especially since there is reason to adapt this guide to each model of mandrel.

Lei present invention aims to provide a mandrel, in particular a mandrel for the glass industry, and a rotary machine which is equipped, which do not have the aforementioned drawbacks of the state of technical lei.

More particularly, the invention aims to provide a simple construction mandrel.

Another object of the invention is to provide a mandrel essentially consisting of parts generally available commercially and if a part should not be generally available commercially, it would be easily manufactured.

Consists of

More particularly, an object of the invention to provide a mandrel not comprising a guide with a spiral guide pitch.

BE2016 / 5835 Another object of the invention is to provide a lighter weight mandrel.

The mandrel of the invention comprises a preferably circular front flange, a preferably circular rear flange connectable to a rotation pin, at least two jaws mounted on jaw holders, at least two means of carrier translation jaw, the front flange comprising at least two radial grooves for guiding the jaw holders arranged radially with respect to the center of rotation of the front flange, a flywheel centered on the axis of rotation and comprising on its periphery a means capable of interacting with a adjustment pinion which interacts with said jaw carrier translation means, said jaw carrier translation means comprising a cylinder secured to each of the front and rear flanges and a piston guided in said cylinder, the jaw carriers being secured to the piston and the cylinder comprising a longitudinal groove in register with the radial grooves for guiding the jaw holders, allowing the radial sliding of the jaw holders [0011] According to an alternative embodiment, each adjustment pinion is integral with an adjustment axis so as to rotate it, adjustment axis which connects the two flanges, dfe preferably by being housed in bearings at the end of the axis integral with those -this and which includes a worm screw thread interacting via a bevel gear with a threaded rod which carries at its opposite end, via a nut, the piston of the .mortan of translation of the jaw holder.

The flywheel is centered on the axis of rotation of the mandrel and is advantageously rotatably mounted by

BE2016 / 5835 compared to the rear flange, rear.

preferably on the flange It will be understood that to actuate the jaws, the operator rotates the flywheel which actuates a kinetic chain which causes the displacement of the piston in its cylinder and of the corresponding jaw. This kinetic chain advantageously composed for each jaw of an adjustment pinion meshing on the flywheel and rotating an adjustment axis, in particular a longitudinal adjustment axis connecting flanges and an angle gear transmitting the relative movement of the flywheel to a rod threaded, the rotation of which causes the piston and the jaw holder to move is of them. As a variant, the kinetic chain comprises an adjusting pinion meshing on the flywheel and mounted on a radial adjustment axis which carries a thread and transmits the relative movement of the flywheel to the piston and therefore to the corresponding jaw holder.

We can easily see that the mandrel of the invention is of particularly simple construction and consists essentially of commercially available parts; if certain parts were not to be commercially available, they are easily manufactured and this at a low price. More particularly, the use of molten parts is avoided.

According to a preferred embodiment, the mandrel of the invention has three jaws and therefore three cylinders arranged radially.

BE2016 / 5835 It is also advantageous that at least the front flange, and preferably each of the front and rear flanges, has a central opening for the passage of the parts to be supported and tightened.

The mandrel of the invention provides good precision and sufficient clamping force, in particular in the case of a mandrel intended for the glass industry.

The mandrel of the invention comprises two flanges secured by in particular three cylinders which ensure the displacement of the jaws and stiffen the assembly. This rigidified structure allows the use of light materials. Furthermore, as in the case of glass mandrel, the gripping force must not be high, the mandrel of the invention can be made from less resistant and lighter materials. All these reasons make it possible to significantly reduce the weight of the device and therefore the wear of the moving parts. The design of the mandrel of the invention makes it possible in particular to use materials such as aluminum. It is thus easy to obtain a mandrel having a weight of 40% less than that of a conventional mandrel of the same diameter.

The masses driven being lower, the mandrel of the invention is particularly suitable for the replacement of conventional mandrels on old machines, without having to replace the motorization sometimes "at the end of so u f f 1 e".

According to an advantageous embodiment, the jaw is arranged in an adjustable manner on the jaw holder. To do this, the jaw is hingedly mounted on the portemors, on a transverse axis, and the angular position is

BE2016 / 5835 adjustable by means of an adjustment screw housed in a thread made in the jaw, and fixable to the jaw holder by means of a locking screw, both housed at one longitudinal end of the jaw.

According to another embodiment of the invention, the worm screw thread is mounted on the adjustment axis by means of a detachable blocking means, for example a pressure screw. This makes it possible to separate the endless thread from its adjustment axis; it follows that upon actuation of the steering wheel the corresponding piston is not driven while the other piston (s) are, thus offering the possibility of an easy adjustment and without particular skill of the relative position and therefore of the tightening of each of the jaws.

The invention also relates to rotary machines equipped with a mandrel according to the invention. Such a machine can comprise two mandrels according to the invention, opposite on the same axis. Preferably, the two opposite mandrels are driven by individual servo-controlled motors so as to synchronize the rotations of the two mandrels.

In particular in the case of new machines, the design of the chucks of the invention and their low mass allow a fairly significant reduction in the cost of motorizing the rotary machines of the invention.

II. It should also be noted that the cost of maintaining rotary machines equipped with mandrels according to the invention is particularly reduced given the design of the mandrel and the choice of parts essentially available on the market or easily machinable.

BE2016 / 5835 The invention will be described in more detail in the following description of an embodiment, supported by the appended figures in which:

Figure 1 is a front view of the mandrel of the invention with three jaws, the jaws and jaw holders being omitted for reasons of clarity;

FIG. 2 is a sectional view along line A-A of FIG. 1, jaw holder and means of displacement thereof omitted for reasons of clarity;

Figure 3 shows the rear flywheel-flange assembly on an enlarged scale;

Figure 4 is a cross-sectional view along a plane passing through a jaw, front and rear flanges omitted for reasons of clarity;

Figure 5 is a schematic view of the transmission of the movement of the steering wheel by means of translation of the jaw holders;

Figure 6 is a side plan view of the jaw carrier translation piston;

Figure 7 is a sectional view along the plane A-A of Figure 6;

Figure 8 is a front plan view of the jaw carrier translation piston; and

Figure 9 is a longitudinal sectional view in a jaw holder and a corresponding jaw.

Overall, and with reference to the figures, the mandrel 1 of the invention comprises a circular front flange

BE2016 / 5835

10, a circular rear flange 50 connectable to a spindle> of rotation (not shown) driven by an electric motor. Three jaws 70 are mounted on corresponding jaw holders 71. A translation means 80 has been provided per jaw holder 71. As can be seen in FIG. 1, the front flange 10 has three radial guide grooves 11 of the doors jaws 71, arranged radially with respect to the center of rotation 3 of the front flange 10 and symmetrically distributed over said flange. A flywheel 100 is centered on the axis of rotation 3 and is rotatable relative to the rear flange 50. It has on its periphery 101 a circumferential surface 103 toothed or notched or provided with pins, capable of interacting with three adjustment pinions 81 integral each of an adjustment axis 83 so as to rotate it. Each adjustment axis 83 is housed in bearings 85, 87 at the ends of the axis mounted in the two flanges 10 and 50. Each adjustment axis 83 also comprises a worm thread 89 which interacts with a pinion of angle gear 93 with a translation means 80 of jaw holders 71. Said translation means 80 of jaws holders 71 comprises a cylinder 95 secured to each of the front 10 and rear flanges 50 and a piston 97 guided in said cylinder 95 and mounted by means of a nut on a threaded rod 99, the end opposite to the piston 97 comprises the bevel gear 93 in interaction with the endless thread 89 of the adjustment axis 83. It is understood that at each door -mors corresponds a means of translation and therefore a pinion assembly 81 lead screw 89 angle gear 93 threaded rod 99 nut 97. The cylinders 95 being securely assembled with the two flanges 10 and 50 considerably stiffen the assembly. Each jaw holder 71 is secured to a corresponding piston 97 using fixing screws housed in holes 73 and 75. Each cylinder

BE2016 / 5835 has a longitudinal groove 98 in register with the radial guide grooves 11 of the jaw holders made in the front flange 10, allowing the radial sliding of the jaw holders 71.

As can be seen in particular in Figure 3, the flywheel is mounted coaxially and rotatably relative to the flanges of the mandrel. According to the embodiment shown, the steering wheel has a shoulder 105 in which are preferably housed three pads 57 of soft material, for example polyethylene, fitted on the end 55 of the rear flange 50. A flange 107 is secured to the steering wheel 100 so as to block the pads 57 longitudinally and to assemble the flywheel 100 on the rear flange 50.

It is easily understood that to spread or bring the jaws closer, the operator actuates the flywheel 100. The relative movement of the flywheel 100 relative to the flanges, actuates the rotation of the adjustment pinion 81 which controls directly or indirectly according to the design of the kinetic chain, the movement of the jaw holders.

[0030]

Advantageously, the mandrel has a central opening 4 intended to facilitate the gripping of long parts.

In order to allow the synchronization of the movement of the jaws 70 to be adjusted, provision can be made to separate the mother screw 89 from its axis 83. To do this, the mother screw can be mounted on its axis 83 by means of a screw. pressure (not shown). In normal operation, the pressure screw secures the lead screw 89 to its axis. To adjust, you can then loosen the pressure screw; Actuation of the steering wheel

BE2016 / 5835

100 moves the jaws except the one or those whose control has been disconnected.

In some applications, it may be necessary to modify the position of the jaws relative to a plane perpendicular to the axis 3 of the mandrel. To do this, the jaw 70 is assembled in a tiltable manner on an axis 77 of the jaw holder 71 and is secured to the jaw holder by means of a locking screw housed in the hole 78 passing through the jaw and

engaging in a net 79 practiced in the bit holder. A thread 76 is scheduled to say tance of the axis of tipping 77 in order to insert a screw adjustment. Lo r s gu ' we press it down screw

adjustment, it separates the end of the jaw from the upper surface of the jaw holder and thus changes the position of the corresponding jaw relative to a plane perpendicular sl the axis of the mandrel. The locking screw fixes the jaw in this position.

Those skilled in the art will understand that the mandrel of the invention is of simple design and can be produced using parts generally available commercially and of reduced weight. This notably results in savings in terms of motorization.

The chucks of the invention can equip new machines or replace the chucks of old machines. In this case also, the reduced masses to be set in motion allow weaker engines, that is to say that one can either mount less powerful engines or recover the old engines which will be subjected to much lower forces.

As already mentioned, the invention also relates to rotary machines equipped with such mandrels. They can have one or, preferably, two mandrels

BE2016 / 5835 according to the invention mounted on the same axis. Preferably, one of the mandrels is mounted axially displaceable on the frame of the rotary machine.

BE2016 / 5835

Claims (12)

Claims 1. Mandrel comprising a front flange (10), a rear flange (50) connectable to a rotation spindle (not shown) driven by an electric motor, at least two jaws (70) mounted on corresponding jaw carriers (71) , a translation means (80) for each jaw holder (71), the front flange (10) having a radial guide groove (11) for each jaw holder (71), arranged radially with respect to the center of rotation ( 3) of the front flange (10) and the radial guide grooves being symmetrically distributed over said front flange (10), a coaxial flywheel (100) being mounted on the rear flange (50) so as to be able to turn by report to this one and comprising on his periphery (101) a medium fit have interact with a pinion adjustment (81) who interacts? ivec said means of translation (80) of jaw holder (71 ), said means of translation (80) of jaw holder (71 ) with a cylinder (95) integral with each of the front and rear flanges and a piston (97) guided in said cylinder, the jaw holders (71) each being secured to a piston (97) and each cylinder (95) having a longitudinal groove (98 ) in register with the radial guide grooves (11) of the jaw holders made in the front flange (10), allowing the radial sliding of the jaw holders (71). 2. Chuck according to claim 1 characterized in that each adjustment pinion (81) is integral with an adjustment axis (83) so as to rotate it, adjustment axis which connects the two flanges, preferably by being housed in bearings (85,87) at axle ends mounted BE2016 / 5835 in the two flanges (10) and (50) and further comprising a worm thread (89) which interacts by means of a bevel gear (93) with a threaded rod (99) which carries at its opposite end, via a nut, the piston (97) of the translation means (80) of the jaw holder (71). 3. Mandrel according to claim 1 or 2 characterized in that at least the front flange (10) is circular. 4. Mandrel according to one of the preceding claims, characterized in that the rear flange (50) is circular. 5. Chuck according to one of the preceding claims, characterized in that it comprises three jaws each associated with a corresponding drive. 6. Chuck according to one of the preceding claims, characterized in that at least the front flange (10), and preferably each of the front flanges (10) and rear 50), has a central opening for the parts to be supported and tightened. for you passage 7. Chuck according to one of the preceding claims characterized in that the jaw (70) is arranged in an articulated manner on the jaw holder (71), on a transverse axis (77), and the angular position is adjustable to the using an adjustment screw housed in a thread (76) made in the jaw, and is fixable to the port.em.ors (71) using a locking screw, both housed at one longitudinal end of the bit (70). BE2016 / 5835 8. Chuck according to one of the preceding claims, characterized in that the worm screw thread (89) is mounted on the adjustment axis (83) by means of a detachable blocking means, for example a pressure screw, 9. Rotary machine equipped with at least one mandrel according to one of claims 1 to 7. 10. Machine according to claim 9 characterized in that it comprises two mandrels according to one of claims 1-7, arranged face to face, along the same axis. 11. Machine according to claim 10 characterized in that one of the mandrels is mounted axially displaceable on the frame of the rotary machine. 12. Machine according to claim 10 or 11 characterized in that the two mandrels are driven by servo-controlled motors. BE2016 / 5835 BE2016 / 5835 ig. 2 BE2016 / 5835