MXPA97010323A - Automatic mechanism of colocac - Google Patents

Abstract

The present invention relates to an automatic object positioning mechanism, comprising the means for supporting the object (1), means for detecting positioning errors, means for moving the means to support the object under control (1), means for activating the means that move the means to support the object, wherein the means for supporting the object (1) comprises an element (31), a floating plate (3) mounted on a plurality of guides (4) located at the end of two orthogonal axes ua the ball joints (6) provided with threaded bearing (7) are associated, wherein the means for moving the means supporting the object under control (1) are formed of a plurality of screws ( 8) coupled to electric servomotors (9), the endless screws are oriented parallel to the centering axis (hh) of the object under control (1), being supported by a fixed frame (5) and which engages the threaded bearing (7) of the unions of b wave (6) so that, by appropriate movement of the pairs of opposite screws (8), a corresponding movement of the object is obtained around the center of the offset axis, and wherein the flat element (31); shaft (hh), independently of the floating float plate (3), and is provided with at least one toothed element (32) which is engaged by a screw (33) driven by a motor (34) for the rotation of the element (31) and, in this way, of the object (1) around the centering axis (Figure

Description

M ECAN I SMO AUTOMATIC PLACEMENT SPECIFICA TION The present invention relates to an automatic positioning mechanism. It is known that in a wide range of technical applications of industrial interest, it is necessary to apply to the placement, that is, the placement and spatial orientation in a pre-established frame of reference, of the objects of different natures, under the strict observation of narrow tolerances . This is the case, for example, of the placement of a deflection yoke or "deflector" on the neck of cathode ray tubes for the reproduction of images and colors, the assembly of lenses in optical instruments of precision, the assembly of antennas or parts thereof in devices for the transmission and / or reception of electromagnetic signals and, more generally, for the assembly of parts of complex devices in which the correct placement of at least one component is crucial for the proper disposition of the same. More particularly, it is known that the assembly of the deflection anvil on a cathode ray tube for the reproduction of color images requires a very precise adjustment of the placement of the yoke on the tube, in order to achieve a reproduced image of good quality. quality The purpose of this adjustment is to place the "electronic beams" related to the three primary colors, red, green and blue, impart the corresponding triads of matches that are located on the inner surface of the tube screen and intended to generate the colors real, so that they compensate for the errors of work of the yoke and the tube. For such adjustment, it is necessary to remove the yoke with respect to the tube. More specifically for the correction of beam convergence, the yoke must be oriented with respect to the screen surface, while the color impurity correction requires that the yoke be moved along an axis perpendicular to the screen. For a suitable geometrical leveling of the image the yoke must be rotated to the level of such an image. Up to now, the above adjustments have been carried out conventionally, by manual, semi-automatic or fully automatic procedures, which essentially provide, for the movement of the yoke by an operator or by means of electromechanical actuators, to obtain displacements of the yoke of a degree and address related to the convergence and purity errors detected by the appropriate instruments for the analysis of the image reproduced on the tube screen: the errors thus detected are suitably coded and signaled to the operator who provides the actual movement of the yoke in case of a semi-automatic procedure, or they become signals that control the means to move the yoke on the neck of the tube in the case of an automatic procedure. A device for placing a baffle on the neck of a cathode ray tube is known from document FR 8306834. However, the known devices result either in complex construction or reduced precision in relation to production requirements current The main object of the present invention is to overcome the above disadvantage and provide an automatic positioning mechanism exhibiting high reliability, which is relatively simple to manufacture, economical and suitable for the placement of object of various natures. This result has been achieved, according to the invention, by providing a mechanism having the features described in claim 1. Other characteristics that are established in the dependent claims. The advantages deriving from the present invention lie essentially in that it is possible to carry out the placement of objects of various natures with extreme precision and to ensure a perfect reproducibility of the laying process due to the mechanical rigidity of the apparatus and the absence of free space; that the present mechanism is easy to manufacture, allows an easy and significant reduction of maintenance interventions and is economical and reliable even after a long life service. These and other advantages and features of the invention will be better understood by those skilled in the art from the reading of the following description in conjunction with the accompanying drawings given as a practical exemplification of the invention, but not considered. limiting sense thereof, wherein: Figure 1 shows an assembly view, partially in section, of an automatic mechanism for placing a deflecting yoke on the neck of a cathode ray tube, according to the invention, the yoke baffle is upright; Figure 2 shows the mechanism of Figure 1 with the deflection yoke that is inclined; Figure 3 shows a top view of the mechanism of Figure 1; Figure 4 shows an elongated view of one of the means for tilting the deflecting yoke of the mechanism of Figure 1; Figure 5 shows an enlarged view, partially in section, of a hinge of the floating plate in the mechanism of Figure 4; Figure 6 shows an enlarged sectional view, taken on the line A-A in Figure 3; Figure 7 shows a schematic representation of the arrangement of the movement means according to a further possible embodiment of the present invention. Reduce to its basic structure, and referring to the attached drawings, an automatic mechanism of placing a deflecting yoke (1) on the neck (2) of the cathode ray tube (T), especially for the reproduction of images of color, according to the invention, comprise means for moving the yoke (1) that are coupled to the means for detecting convergence errors of the electronic beams, related to the three primary colors and related to the errors of purity of the colors, so that the means of movement of the yoke (1) will be activated as a consequence of the possible errors of convergence and / or purity: the movement of the yoke (1) achieved by the displacements of an extension and direction related to the nature and magnitude of the errors detected.

Advantageously, according to the invention, such yoke movement means (1) comprises a floating plate (3) which cooperates with a flat element (31) to support the yoke (1) of a circular profile, placed parallel on the floating plate (3) that is mounted, at the ends of the axes orthogonal to each other, on four vertical sliding guides (4) each of which is associated with a corresponding ball joint (8) wherein a bearing nut-like threaded (7) is housed to couple the screwing of the worm (8) operable by an electric servomotor (9) and oriented parallel to the longitudinal axis (hh) of the tube (T). Going through each pair of ball joints (6), which corresponds to opposite orthogonal axes of the floating plate (3), is a barycentric axis of the same plate. Such screws (8) are advantageously supported angularly equidistant from a frame (5) and placed in such a way that the axes of the screws (8) provided in correspondence of the two confronting sides of the floating plate (3) define a plane which passes through the barycenter of the same plate. In this way, using four screws (8), that is, two screws (8) for each orthogonal axis of the floating plate (3), two planes will be defined orthogonal to each other and passing through the center of gravity of the plate.

The rotation of each screw (8) drives the corresponding connection (6) in motion. As a consequence, the synchronized rotation of the four servomotors (9) in the same direction, allows the translation of the floating plate (3), with the corresponding translation of the yoke (1) in the direction of the longitudinal axis (hh) of the tube (T) to correct errors of purity. Furthermore, with the synchronized opposite rotation of the servomotors (9) associated with the screws (8), the latter resulting in correspondence of two confronting sides of the floating plate, the termination is obtained, in one direction or the other, in the floating plate (3) and therefore of the yoke (1) around the axis which joins the joints (6) associated with the non-activated servomotors (9) and passes through the center of gravity of the floating plate (3). By means of the suitable movement of the alternating pairs of the servomotors (9), the yoke (1) can be moved to a spherical surface with center in (x) (see Figure 1) to correct the convergence errors. In a further embodiment, similarly illustrated in Figure 7, the yoke movement means (1) (indicated for simplicity by means of four circles representing the important motors (9)), can be placed in correspondence of the angular portions of the frame (5). In the drawing, the motors (9) are shown, for clarity of representation, on the same plane of the frame (5) which is represented diagrammatically by a frame figure. By placing [appropriately] the motors (9), together with the remaining relevant parts of the movement means, the plate. (3) can be easily moved around an oblique axis that passes through the center (x) and coincides, in the illustrated example, with a diagonal (y) of Figure 7. The vertical sliding guides (4) make it possible to compensate the variations in distance between the center of each nut (7) and the center of the floating plate (3) during the pivoting of the latter in the inclined direction. The flat element (31) is advantageously connected to the floating plate (3) by means of a plurality of slotted clamps (35) coupled with guide pulleys (36) supported by the floating plate (3) and is also provided with an arc-shaped sector gear (32) capable of being coupled with a helical toothed screw (33) associated with a corresponding motor member (34) to allow rotation of the same flat element (31) and therefore of the yoke (1) ) around the longitudinal axis (hh) of the tube (T). Associated with each of the sides (4) is a corresponding linear transducer (10) that allows the detection of its instantaneous position. Each transducer (10) is connected to electronic microprocessor means, to which the servomotors (9) are associated: the electronic means, which operate the servomotors (9), are also connected to a system to detect the convergence errors of the electronic beams and of purity of the colors, to activate the servomotors (9) as a consequence of the detection of possible convergence, rotation and / or purity errors. Both processing means and those for the detection of convergence and purity errors are constructed with technology known per se by those skilled in the art and are not described in the present in greater detail. While the above described mechanism refers to the case of the placement of a deflecting yoke on the neck of a cathode ray tube for the reproduction of color images, it will be appreciated that such mechanism is also suitable for the placement of objects of color. another nature, as initially stated in this description. Practically, all construction details may vary in any equivalent way, as long as the form, dimensions, arrangement of elements, nature of the materials used are involved, if n depart from the scope of the solution adopted, and from this way, remaining within the protection limits granted to the present patent for industrial invention.

Claims (4)

REI VI N D I CATION ES

1 . An automatic object positioning mechanism, comprising means for supporting the object under control, means for detecting positioning errors, means for moving the means supporting the object under control, electronic microprocessor means, connected to the detection means of positioning error to drive the means that move the support means of the object, characterized in that the means for supporting the object under control, consist of an element and an underlying floating plate, mounted on four vertical guides, located respectively at the end of two orthogonal axes and to which the ball joints with the relevant threaded bearing are associated; in which such means for moving the means supporting the object under control, are made of four endless screws, coupled to electric servomotors, such endless screws are oriented parallel to the central axis of the (hh) object under control, which is supported by a fixed frame, and which engages the threaded bearing of the ball joints, so that, by appropriate movement of the pairs of opposite screws, a corresponding movement of the object under control is obtained, around the center (x), of the centering axis (hh); and in that the flat element for supporting the object under control can rotate freely around the axis (hh), irrespective of the floating plate, and is provided with at least one toothed element that engages with a screw, driven by a motor for the rotation of the flat element and, therefore, of the object under control, around the centering axis (hh).

2. The automatic object positioning mechanism according to claim 1, characterized in that the two pairs of screws opposite, define two planes orthogonal to each other and passing through the barycenter of the floating plate (3).

3. The automatic object positioning mechanism according to claim 1, characterized in that the toothed element is developed as a circular sector.

4. The automatic object positioning mechanism according to claim 1, characterized in that the flat element has a circular profile and is connected to the underlying floating plate by means of two slotted clamps coupled with corresponding guide pulleys, mounted on the floating plate. RESUMEN OF THE I NVENTION The automatic object positioning mechanism, comprising means for holding the object (1), means for detecting positioning errors, means for moving the means to support the object under control (1), means for activating the means that move the objects. means for supporting the object, wherein the means for supporting the object (1) comprises an element (31), a floating plate (3) mounted on a plurality of guides (4) located at the end of two orthogonal axes and to which The ball joints (6) provided with threaded bearing (7) are associated; wherein the means for moving the means supporting the object under control (1) are formed of a plurality of endless screws (8) coupled to electric servomotors (9), the endless screws are oriented parallel to the centering axis ( hh) of the object under control (1), being supported by a fixed frame (5) and coupling the threaded bearing (7) of the ball joints (6) so that, by appropriate movement of the pairs of opposite screws (8), a corresponding movement of the object is obtained around the center of the offset axis; and wherein the planar element (31); it can be rotated about the axis (hh), independently of the floating float plate (3), and is provided with at least one toothed element (32) which is engaged by a screw (33) driven by a motor (34) for the rotation of the element (31) and, in this way, of the object (1) around the centering axis (Figure 1).