Abstract: A torque-transmitting clutch includes a first clutch element having a first base body and a first end face, a second clutch element, and a third clutch element having a third base body. In a closed position, the first and the second clutch elements are connectable in a positive locking and/or force-fit manner for transmitting torque, and in an open position, this positive locking and/or force-fit connection is released, and wherein the first clutch element is connectable to the third clutch element in a positive locking and/or force-fit manner. The first clutch element is produced according to a powder-metallurgical or an additive method and has at least one centering projection arranged on the first end face and extending towards the third clutch element to cooperate with and/or be accommodated with a centering recess in an end face in the third clutch element in a positive locking and/or force-fit manner.

Abstract: A bearing unit having a stationary radially outer ring provided with a raceway, a radially inner ring rotatable about a central rotation axis (X) of the bearing unit and provided with a raceway, a row of rolling elements interposed between the radially outer ring and the radially inner ring, at least one sealing device mounted by means of interference on the radially outer ring and in sliding contact with the radially inner ring, wherein both the radially outer ring and the radially inner ring are made of low carbon steel with a minimum percentage by weight of carbon equal to 0.42%, and a central portion of the radially outer ring situated along the raceway and a central portion of the radially inner ring situated along the raceway are heat treated by means of induction hardening.

Abstract: A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 ?m or lower.

Abstract: The present disclosure is directed to a shaft assembly (95) for a turbine engine (10), the shaft assembly (95) defining an axial direction and a radial direction, wherein the turbine engine (10) includes a fan or propeller assembly (14) and an engine core (20) and further wherein the fan or propeller assembly (14) includes a gearbox (45). The shaft (assembly 95) includes a coupling shaft (100) defining a plurality of coupling shaft teeth (105) extended in the axial direction, wherein each coupling shaft tooth (105) is in circumferential arrangement along the coupling shaft (100). The coupling shaft (100) includes a first material (103) and the plurality of coupling shaft teeth (105) include a second material (104) different from the first material (103).

Abstract: A toner drum drive assembly is configured to engage a drive mechanism of a printer. The assembly includes a support portion defining an axis, and a drive projection extending axially from the support portion. The drive projection includes three radially outwardly and circumferentially extending arm portions, with each arm portion having an end. The drive projection defines three undercuts, and each undercut is positioned axially between the support portion and a respective arm portion end.

Abstract: Drive transmission part and system including a coupling member configured to have one or more restricted degrees of freedom, and a gear hub to rotationally engage the coupling member.

Abstract: An intake camshaft device 1 includes an intake camshaft, a first rolling bearing and a second rolling bearing for rotatably supporting both end parts of the intake camshaft, and a first sliding bearing and a second sliding bearing for rotatably supporting the intake camshaft between the first and second rolling bearings. The first rolling bearing is arranged in a same plane as a rotation plane of a sprocket for an intake cam. In other words, the first rolling bearing is positioned in a plane which is overlapped with a plurality of teeth of the sprocket for the intake cam, and perpendicular to a center axis. The first sliding bearing is disposed adjacent to the first rolling bearing backward in an axial direction.

Abstract: A dog clutch gear is provided that can prevent stress concentration due to a machined edge from occurring in the dog clutch gear and that can prevent a cutting load from being intermittently applied to a cutting tool to lengthen the lifetime of the cutting tool. The dog clutch gear includes a rim portion formed with power transmission teeth on the outer circumference; a boss portion fitted to a rotating shaft; an annular connecting portion connecting the rim portion with the boss portion; and a dog member formed on a lateral surface of the annular connecting portion. A machined surface is formed on an axial end surface of the boss portion. A runout groove axially continuing from the dog member toward the axial end surface of the boss portion is formed at a joint portion between the boss portion and the dog member.

Abstract: A drive gear for a generally cylindrical imaging component. The drive gear includes a body for engaging the generally cylindrical imaging component; a cylindrical shaft attached to the body, the cylindrical shaft having an end surface; and three prongs extending longitudinally outward from the end surface.

Abstract: The invention relates to a hair extension remover (1), which comprises two crimping jaws (6, 7) that can be moved relative to each other by means of a drive (3, 4, 5). A liquid container that can be pressurized and that is in the form of a piston-cylinder unit (9, 10), opens into the vicinity of the crimping jaws. In order to ensure exclusive linear motions, the drive of the crimping jaws (6, 7) and the pressurization of the piston-cylinder unit (9, 10) are each designed as a gear drive (3, 4, 5; 11, 12, 13). Each gear drive can comprise either a gear rack (11) having a pinion or a gear wheel segment (12), or a gear spindle (4) having a movement nut (5). The two gear drives (3, 4, 5; 11, 12, 13) can be coupled in an adjustable and motion-transmitting manner.

Abstract: The invention relates to an arrangement comprising a gear and a coupling element, which is connected to the gear in a form-fitted manner in order to transmit a rotational motion. The gear and the coupling element each have a geometry (e.g., GZ, GK) on end faces facing each other, which form a form-fitted connection in connection with the geometry of the other element. The gear and the coupling element are designed as components produced by sintering, into which the respective end-face geometries (GZ, GK) are impressed. Using these end-face geometries, the gear and the coupling element are positioned relative to each other.

Abstract: A drive gear for a generally cylindrical imaging component. The drive gear includes a body for engaging the generally cylindrical imaging component; a cylindrical shaft attached to the body, the cylindrical shaft having an end surface; and three prongs extending longitudinally outward from the end surface.

Abstract: The present invention relates to a decelerator for generating a booming sound. In particular, the present invention includes a shaft connected with a motor; an input (first) gear engaged in the input shaft, and an output (second) gear mated with the input gear. The motor controls the vehicle speed and delivers the torque of the output (second) gear which is characterized in that output gear further includes an unbalanced drive (third) gear installed on the shaft spaced a predetermined distance from the input (first) gear. Further, an unbalanced driven (fourth) gear is mated with the unbalanced drive (third) gear, and an unbalanced module, having an unbalanced mass, is connected with the unbalanced driven (fourth) gear.

Abstract: A pinion shaft and bearing assembly is provided having two different surface finish interfaces. A first surface finish functions to locate the bearing to the pinion. A second surface finish functions to improve the cure time of an adhesive used to retain the bearing to the pinion.

Abstract: A high-strength, high-precision injection-molded gear in which resin flow regulating projections that partially thicken a web are formed in a position on a side surface side of the web between pin point gates and a teeth section such as to project from the side surface of the web. The resin flow regulating projections are formed such that a center section thereof, the highest in height, is on a radial direction line extending from the pin point gates in the outward radial direction and the height gradually decreases away from the position on the radial direction line in a circumferential direction of the web.

Abstract: A metallic structural part is described which is joined from at least two components (1, 2), of which one component (1) comprises a hub-like nose (3) for receiving the other annular component (2) without play, which is placed on the nose (3) so as to be stopped there and is secured against axial withdrawal by a latching ring which engages in a circular latching recess (8) of one of the two components (1, 2). In order to provide simple constructional conditions it is proposed that the latching ring engaging in the latching recess (8) of the one component (1) consists of a radially projecting ring segment (7) of the other component (2) and that the radial projecting portion (r) of the ring segment (7) corresponds at most to the magnitude of the maximum elastic deformation of the ring segment (7) in the radial direction.

Abstract: An articulated lift aim assembly for a refuse receptacle generally includes an engaging device for releasably grasping the receptacle, an extendable boom along with an articulated arm mechanism interconnecting the book and the engaging device. A gear arrangement provides for coupling the boom and the arm for raising the arm mechanism with respect to the boom, rotating the arm mechanism with respect to the boom during raising of the arm mechanism and inverting the engaging device and receptacle during raising of the arm mechanism. A gravity operated hook is provided for latching the receptacle when the receptacle is inverted to prevent undesired release from the engaging device.

Abstract: A transmission component with a functional structure has a linear or crossed shaft body, a transmission structure integrally formed on the shaft body and extending in a radial direction; a sensor matching structure and a shaft matching structure formed on the shaft body so that a sensor and a bearing may be conveniently assembled on the shaft body and the size of the transmission component can be miniaturized, and a reinforcing rod which may be inserted into the shaft body in an axial direction to enhance the structure intensity of the shaft body.

Abstract: A component with inner teeth (3) and outer teeth (6). The component (7) comprising a basic body (2) provided with the inner teeth (3) and a sheet component (5) provided with the outer teeth (6). The sheet component (5) is connected to the basic body (2), during the manufacturing process, by positive interlock in both the tangential and radial directions.

Abstract: A swing mechanism for a construction machine is provided with a center frame 3 having a pinion insertion hole 3c, an inner race having an internal gear and mounted on a side of an undercarriage, an outer race 1b rotatably arranged surrounding the inner race and provided with the center frame secured thereon by bolts 8a, a pinion maintained in meshing engagement with the internal gear of the inner race, and a pinion drive device. A pin fit-in hole 3d arranged in the center frame 3 such that a knock pin 6 fixed on the outer race 1b is fitted in the pin fit-in hole to position the center frame 3. To arrange the pin fit-in hole 3d in the center frame 3, a pin fit-in hole portion 20 through which the pin fit-in hole 3d is formed is locally arranged such that the pin fit-in hole portion 20 extends toward the pinion insertion hole 3c to have a center of the pin fit-in hole 3d located on a center connection line S.

Abstract: A retention assembly for a jack is disclosed. The retention assembly includes a housing, a bushing, a shaft, a gear, a pin, and a spring. The housing includes a housing aperture, into which the bushing is positioned. The shaft, which includes a shaft aperture, extends through the bushing such that the portion of the shaft defining the shaft aperture is positioned within the housing. The gear, which includes a gear aperture, is positioned on the shaft such that the gear and shaft apertures align to accommodate the pin. The spring is positioned on the shaft and within the housing such that a first end of the spring applies a force to the bushing to retain the bushing in the housing aperture and a second end of the spring engages the pin to retain the pin within the shaft and gear apertures.

Abstract: A shaft rotating mechanism for a mower is disclosed. The shaft rotating mechanism comprises a housing; a driving shaft settled in the housing; a driving gear rotatably mounted around the driving shaft and comprising a plurality of first one-way teeth; a shiftable gear unrotatably mounted around the driving shaft and comprising a plurality of second one-way teeth; a clutch settled for engaging or disengaging the shiftable gear with or from the driving gear; and a worm having one end connected with a power source of the mower and an opposite end coupled with the driving gear for driving the driving gear to rotate. Thereby, the clutch, when operated, moves the shiftable gear along the driving shaft to make the shiftable gear couple with the driving gear so that the driving shaft is driven by the driving gear to rotate.

Abstract: A speed reducing mechanism includes: a driven member; and a decelerating member transmitting a drive force from an actuator to the driven member. The driven member includes an engagement pin. The decelerating member includes: a teeth portion engaging a rotor pinion portion serving as the drive force from the actuator; and a cam slot engaging the engagement pin. The decelerating member is rotatably supported and is formed into a sheet shape thinner than a face width of the rotor pinion portion.

Abstract: A toothing of a pinion, which corresponds to a toothed piston of a door closer or of a door operator. The toothing is mounted position-oriented with regard to the two square shaft ends located at the ends of the pinion.

Abstract: The invention relates to rotary units and rotary mechanisms that are suitable for use in numerous applications. Rotary units typically include rotational components that are configured to rotate. In some embodiments, for example, multiple rotary units are assembled in rotary mechanisms such that neighboring pairs of rotational components counter-rotate or contra-rotate relative to one another during operation of the rotary mechanisms. Rotational components generally include one or more implements that are structured to perform or effect one or more types of work as the rotational components rotate relative to one another in a given rotary mechanism. In certain embodiments, implements are configured to rotate and/or to effect the movement of other components as rotational components rotate.

Abstract: The invention relates to a motor-vehicle/gearwheel arrangement for a motor-vehicle auxiliary gearing having a gearwheel, having a flange arrangement with at least one, preferably two flanges, wherein the gearwheel is arranged adjacent to at least one of the flanges such that these rotate about a common rotational axis and engage one into the other, and with at least one connecting element for connecting the gearwheel to at least one of the flanges. An arrangement according to a first independent embodiment is advantageous in that the gearwheel has at least one connecting-element receiving depression which leads into the body of the gearwheel parallel to the rotational axis, or has, from the body of the gearwheel, an elevation for receiving the connecting element.

Abstract: A speed change gear with dog clutch pawls projected on a side surface of a gear body having a speed change gear part on an outer peripheral surface thereof, and a method and a device of manufacturing the same, in which the dog clutch pawls are provided with back tapers on at least engaging surface thereof, and the dog clutch pawls with back tapers and the change gear part are integrally molded by forging.

Abstract: A gear, a method and a device having a transmission gear part and a hub synchro having a spline teeth formed on an outer peripheral surface thereof and plurality of key holes formed in the opposite side of the transmission gear part, in which the hub synchro is coaxially provided with said transmission gear part, the diameter of the hub synchro is smaller than that of the transmission gear part, and the spline teeth and the plurality of key holes on the hub synchro are formed by forging.

Abstract: An injection molded resin gear 1, which is molded by injecting a resin material from a plurality of pinpoint gates 13 into a cavity 2 of a die, includes a rim 7 having teeth 8 on its outer periphery, a shaft supporting portion 5 into which a shaft 3 is to be fitted, a web 6 extending in radial directions to connect the rim 7 to the shaft supporting portion 5, and a plurality of resin flow velocity regulating grooves 11.

Abstract: Traction planets and traction rings can be operationally coupled to a planetary gearset to provide a continuously variable transmission (CVT). The CVT can be used in a bicycle. In one embodiment, the CVT is mounted on the frame of the bicycle at a location forward of the rear wheel hub of the bicycle. In one embodiment, the CVT is mounted on and supported by members of the bicycle frame such that the CVT is coaxial with the crankshaft of the bicycle. The crankshaft is configured to drive elements of the planetary gearset, which are configured to operationally drive the traction rings and the traction planets. Inventive component and subassemblies for such a CVT are disclosed. A shifting mechanism includes a plurality of pivot arms arranged to pivot about the centers of the traction planets as a shift pin hub moves axially.

Abstract: Traction planets and traction rings can be operationally coupled to a planetary gearset to provide a continuously variable transmission (CVT). The CVT can be used in a bicycle. In one embodiment, the CVT is mounted on the frame of the bicycle at a location forward of the rear wheel hub of the bicycle. In one embodiment, the CVT is mounted on and supported by members of the bicycle frame such that the CVT is coaxial with the crankshaft of the bicycle. The crankshaft is configured to drive elements of the planetary gearset, which are configured to operationally drive the traction rings and the traction planets. Inventive component and subassemblies for such a CVT are disclosed. A shifting mechanism includes a plurality of pivot arms arranged to pivot about the centers of the traction planets as a shift pin hub moves axially.

Abstract: There is provided a resin gear 1 capable of improving the strength of a key receiving portion, which is engageable with a key of a driving shaft, to prevent the key receiving portion from being broken by external force applied during rotation. In the resin gear 1, an outside rim 6 is connected to an inside hub 4 by a web 7 in radial directions. On the side of one end of the hub 4, a key receiving portion 10 for engaging a key of a driving shaft 2 is formed. The key receiving portion 10 has a side wall 1 for preventing relative rotation of the key 8 to the hub 4, and a bottom wall 12 for allowing the key 8 and hub 4 from being positioned in directions parallel to the driving shaft 2.

Abstract: A resin gear comprises a rim in an outer peripheral part of a plate, teeth provided on an outer periphery of the rim, a boss provided in a central part of the plate, and a circular rib between the boss and the rim. The resin gear is manufacturable by injection molding that a molten material is injected into a cavity through a plurality of gates arranged at almost equally spaced intervals circumferentially on a forming portion for the circular rib in a direction perpendicular to a side of the plate. The resin gear includes a plurality of inner thin-wall portions on the plate between the circular rib and the boss and a plurality of outer thin-wall portions on the plate between the circular rib and the rim, each of the inner thin-wall portions and the outer thin-wall portions being symmetrically shaped with respect to the radial line passing through each gate corresponding point.

Abstract: In a thermally transcribing printer including a frame, a roller shaft, a roller shaft drive gear and a motor, the roller shaft includes one end installed on an inner side of the frame and folded to bend in an L-like shape and other end fitted to a drawout preventing portion in a recess shape of the frame. The roller shaft drive gear includes a hook portion attached to the one end of the roller shaft, engaged with a portion of the roller shaft other than the fold-bend portion disposed a vicinity of the one end of the roller shaft and having an opening width smaller than a diameter of the roller shaft for restraining the roller shaft from being detached in the bended direction, and a pair of rotation preventing ribs for holding to squeeze the fold-bend portion of the roller shaft.

Abstract: A retaining member is provided and attached to a bevel gear in order to allow the bevel gear to be attached, prior to assembly, to a bearing adapter. The retaining member is provided with first and second protuberances that extend radially outwardly from diametrically opposite positions on the retaining member so that the protuberances can be inserted through first and second slots in a generally cylindrical member, or bearing adapter, during the assembly of individual components to form a subassembly. Since the bearing adapter is attached to a bearing carrier, misalignment of the protuberances and the slots allow the bevel gear and several other assorted components to be retained in contact with the bearing carrier so that the components are not free to move in axial directions away from each other to allow separation of these components.

Abstract: A sector gear is formed as one of a pair of mirror image gears (12, 14). Each of the sector gears has an arcuate portion (16) having a series of teeth (18) on an outer periphery thereof, and a V-shaped base portion (20) having a first leg (22), a second leg (24) and an apex portion (26). The first leg (22) has an S-shaped configuration and connects with the arcuate portion (16) at a first end thereof. The second leg (24) has an inverted S-shape and connects with the arcuate portion (16) near an arcuate mid-length of the arcuate portion (16). The first leg (22) and second leg (24) merge smoothly with the apex portion (26). The apex portion (26) has an aperture (30) at a radial center of the arcuate portion (16). Each of the gears has an inner periphery (28) that enables complementary nesting of the pair of sector gears (12, 14).

Abstract: A method of producing a torque transmission between a driving member and a driven member including the steps of capturing an annular gear within the interior of a hollow cylindrical shell formed of a formable material which is caused to be flow formed around a portion of the exterior of the gear to militate against any relative longitudinal and axial movement between the shell and the gear.

Abstract: When a plastic oil pump gear in a motorcycle engine needs to be replaced, first, the gear is removed from its shaft. A keeper is inserted into the slots in the shaft that originally held the plastic gear. A steel gear is screwed onto the keeper so as to be mounted on the shaft through the keeper in place of the plastic oil pump gear.

Abstract: A transmission gear with a dog clutch gear in which the dog clutch gear has clutch teeth formed on an outer circumferential surface of a ring part and tapered inversely so that the tooth thickness of each tooth decreases gradually from a chamfer portion at a tip end toward a base end portion thereof, and the dog clutch gear is integrally fitted onto a boss portion of the transmission gear which portion is coaxially and integrally formed on a side surface of the transmission gear, characterized in that a flange is provided on the ring part to be located on the side corresponding to the base end portion of the clutch teeth, and plurality of surfaces between the ring part and the transmission gear is performed by welding.

Abstract: The present invention is a transmission output shaft that combines a splined or keyed shaft and a yoke or cv-joint into a single unitary shaft. This combination makes for a longer axial length than a separate, individual shaft and yoke arrangement. The simplistic design and unitary construction makes for easy modification of the existing two-part shaft and yoke. The conventional shaft and yoke are removed and replaced with the unitary differential output shaft of the present invention. Various seals and bearing may or may not be used to enhance the overall performance and increase the life span of the jointed area. Due to its simple design and decreased number of parts, the present invention is more cost effective, has a greater reliability and reduces assembly cost because of its ease of installation.

Abstract: A transmission comprises a pair of drive shafts, one an input shaft and the other an output shaft, wherein one of said shafts is attached to a toothed cam having a trochoidal profile and the other drive shaft is attached to a roller ring having a plurality of cylindrical roller shafts aligned to mesh with said toothed cam and thereby permitting the transfer of torque from one shaft to the other.

Abstract: Idler gear as an example of gears having a part worked by cutting, and method and apparatus for manufacturing the same in which the chamfer part is formed at least in a portion between a tooth form with chamfers formed by forging process on an outer peripheral surface and the end part thereof in the axial direction by cutting.

Abstract: A gear having window holes, and method and apparatus for mafufacturing the same in which by depressing partially one end surface of a primary formed article, a plurality of concaves for the window holes is formed at the one end surface in an axial direction of the primary formed articles, a plurality of projections are extruded from the other end surface thereof and tooth forms preformed at an outer peripheral wall of the primary formed article is thrown out in radial direction thereof, and the gear is formed by cutting the plurality of projections extruded from the other end surface thereof.

Abstract: An injection molded resin gear 1 includes an outside rim 6, an inside hub 4, a web 7 extending in radial directions to connect the rim 6 to the hub 4, and circumferential ribs 8 which are formed on both sides 9 and 9 of the web 7 between the hub 4 and the rim 6 so as to be concentric with the rim 6. A plurality of inside radial ribs 10 extending from the hub 4 to the circumferential ribs 8 are formed on the sides 9 and 9 of the web 7 between the hub 4 and the circumferential rib 8 so as to be arranged in regular intervals in circumferential directions. A plurality of outside radial ribs 11 extending from the circumferential ribs 8 to the rim 6 are formed on the sides 9 and 9 of the web 7 between the circumferential ribs 8 and the rim 6 in regular intervals to be displaced in circumferential directions with respect to the inside radial ribs 10 so as to be arranged between connecting portions at which the inside radial ribs 10 are connected to the circumferential rib 8.

Abstract: An injection-molded plastic gear 1 as a molded gear includes a plurality of teeth 12 formed around an outer periphery of a rim, and a plurality of blades 8 formed at distances circumferentially on an inner peripheral surface of the rim 11 to produce an axial flow of air. A radially inner portion is formed on the side of inner peripheries of the blades 8 to support the rim 11 through the blades 8. When such injection-molded plastic gear 1 is rotated, the blades 8 produce an axial flow of air passed through holes 10 from the surface side to the back side. The flow of air can be blown to a part such as an IC, a motor and the like disposed adjacent the molded gear to cool it, and the heat of the teeth 12 and the rim 11 can be taken away by a heat transfer, whereby the teeth 12 and the rim 11 can be cooled. Thus, the injection-molded plastic gear 1 has a function as a cooling fan, whereby a forcible convection (flow of air) can be produced in a gear-accommodated space.

Abstract: A gear made of a resin including substantially annular toothed portion formed at a radially outer location, a shaft-supporting section formed at a radially inner location around a rotational center of the toothed portion, and a web connecting the shaft-supporting section and the toothed portion to each other. A circumferential rib is formed on the web concentrically with the toothed portion, and diametrical ribs are also formed on the web radiately to connect the circumferential rib and the shaft-supporting section to each other in a radial direction.

Abstract: A gear drive mechanism for downsizing office products, which can be easily disassembled, by thinning the gear drive mechanism. The gear drive mechanism drives a plurality of shafts cantilevered from a base plate attached within a label writer, wherein gears are fit on the shafts, and are engaged with each other, with specific shafts used as drive shafts. The gear drive mechanism comprises a groove formed around an end of at least one of the driven shafts other than the specific shafts, a ring-shaped washer having a slit in a direction of a diameter fit in the groove as a gear removal preventive and a recessed portion provided to a side surface of the gear throughout the washer.

Abstract: The invention concerns a gearwheel for a mechanical gearwheel transmission of an automotive vehicle, which gearwheel rotates loosely on a shaft, cylindrical rolling elements (18, 19) being arranged between an inner raceway associated to the shaft and an outer raceway associated to a hub of the gearwheel. According to the invention, the gearwheel (13) is mounted through two spaced apart roller crown rings comprising cylindrical rolling elements (18, 19) and cages (20, 25), projections (21, 26) of the cages (20, 25) engaging into a groove (22) that is arranged in a radially inward pointing center flange (24) between the outer raceways (17). In this way, an inseparable pre-assembled unit made up of the gearwheel (13) and the roller crown rings is formed that facilitates the assembly of the mechanical gearwheel transmission.

Abstract: A method of producing a torque transmission between a driving member and a driven member including the steps of capturing an annular gear within the interior of a hollow cylindrical shell formed of a formable material which is caused to be flow formed around a portion of the exterior of the gear to militate against any relative longitudinal and axial movement between the shell and the gear.

Abstract: A drive system comprises a movement mechanism comprising a spherical holder (1) and a spherical bowl which, one inserted into the other, are rotatable relative to each other about an X-axis and a Y-axis, which axes lie in a plane substantially coinciding with the plane of the outside edge of the holder or extending parallel thereto. Viewed in the X-Y plane, the holder comprises two mutually perpendicular slots (4,5), provided through the holder, each of said slots having an adjusting element provided therein for motor displacement, which adjusting element is further freely movable in the bowl in a direction, viewed in the X-Y plane, perpendicular to that of the relevant slot in the holder. Through the relevant slot in the holder, the adjusting element is in an operative connection with a drive mechanism placed in the holder, which drive mechanism is connected to a motor that is likewise placed in the holder.