RU2504845C1 - Prism turning gear in advertising unit - Google Patents

Abstract

FIELD: mechanics.SUBSTANCE: prism turning gear in an advertising unit includes a drive link installed on a drive shaft perpendicular to a prism axis and made in the form of a pair of disc cams interacting with cogs of a driven cog-wheel rigidly fixed on the prism axis and a movable communication device formed with an axial projection of the cog-wheel, which is arranged in an annular groove between disc cams. Besides, the movable communication device includes annular projections located between disc cams radially to the drive shaft; an end of the prism axis passed through an axial through hole of the cog-wheel and its axial projection is arranged in a slot between the annular projections. Outer surfaces of radial annular projections and an end surface of cog-wheel axial projection, which interacts with them, are made so that a spherical kinematic pair is formed.EFFECT: improving operating reliability of a turning gear; providing stability of mutual location of drive and driven links of the gear during the whole rotation cycle of the drive shaft; and improving quality of a shown picture.8 cl, 6 dwg

Description

The invention relates to a means of visual presentation of information and can be used in dynamic advertising installations with the successive change of advertising images in the information field formed by installed in a series of prisms.

State of the art

A known advertising installation (patent RU 2165649, IPC: G09F 11/02, publ. 04/20/2001), containing mounted in the supports with the possibility of rotation around its own axis of the prism with the components of the advertising image applied to their faces and a rotation drive of the prisms, including associated with the engine drive shaft and many turning mechanisms, according to the number of prisms. The rotation mechanism includes a drive disk mounted on the drive shaft with a protrusion acting on the rays of the driven sprocket, rigidly mounted on the axis of the prism and made with the possibility of simultaneous support contact of two adjacent rays with the diametrical plane of the drive disk. A disadvantage of the known installation is the low reliability, low quality of the advertised image, quick one-sided wear of the contact surfaces.

A well-known advertising installation (patent RU 38991 U1, IPC: G09F 11/02, published July 10, 2004), in which the prism rotation mechanism includes a driven bevel gear fixed to the prism axis interacting with the gear sector of the driving link made in the form of a pair disks mounted on the drive shaft, and means for preventing the displacement of the driving link relative to the axis of the prism, formed by the axial protrusion of the driven wheel, placed in an annular guide between the disks of the driving link. During the demonstration of the image, the driven link and the axis of the prism are reliably fixed in one position due to the two-sided planar contact of the inner diametric planes of the drives of the driving link and the opposite faces of the outer surface of the driven wheel.

However, during the rotation of the prism, the mentioned two-way contact between the links is absent and there is a high probability of the axis of the prism deviating from its vertical position, as a result of which contact between the engaging elements of the driving and driven links and the prism rotation will not occur.

The closest analogue to the claimed technical solution is the mechanism of rotation of the prism in the advertising installation according to the invention patent RU 2267816, IPC: G09F 11/02, publ. January 10, 2006. The aforementioned rotation mechanism includes a driving link in the form of a pair of disk cams interacting with the sprockets of the driven sprocket wheel, rigidly fixed to the prism axis, and a movable means formed by the axial protrusion of the sprocket wheel, mounted on a drive shaft perpendicular to the prism axis, located in the annular groove between the disk cams.

The sprocket wheel, according to the Polytechnical Dictionary, is a cylindrical wheel with teeth in the form of cylindrical pin-protrusions placed on the diametrical plane of the wheel, the axes of which are parallel to the axis of the wheel.

Leading disk cams interact with the teeth (hereinafter referred to as tsols) of the sprocket wheel, allowing the prism to rotate, after which the sprocket wheel is set to a position in which part of the sprocket contacts the outer diametric planes of the drive disks, and at the same time, the other part of the sprockets contacts the inner diametric planes these discs, which eliminates the prism rotation in the process of image demonstration.

However, such two-sided contact is point-like and is characterized by the presence of some gaps between the spindles and the diametrical planes of the disks, which leads to “trembling” of the prisms during the demonstration of the image and, as a result, the low definition of the advertised image, which complicates its visual perception.

Another significant drawback of the known solution is that the means of mobile communication used between the drive and driven links used in the construction prevents the drive link from moving along the drive shaft, but does not exclude the possibility of an angular deviation of the prism axis (driven axis) from its vertical position in turning moment when there is no two-sided fixing of the gear wheels of the driven wheel for the diametrical plane of the drive discs Because the height and mass of the prism are incomparably greater than the parameters of the axial protrusion of the driven wheel located in the annular groove between the drive disks, even with an insignificant deviation of the axis from verticality, the axial protrusion of the pin wheel from the groove can jump out, which will lead to disruption of the rotation mechanism and installation as a whole.

Disclosure of invention

The task to which the claimed invention is directed is to create a more advanced prism rotation mechanism that ensures reliable and uninterrupted operation of an advertising installation.

The technical result achieved by using the claimed invention is to increase the reliability of the rotation mechanism, ensuring the stability of the relative position of the driven and leading links of the mechanism throughout the rotation cycle of the drive shaft: both during the demonstration of images and during rotation of the prisms.

An additional technical result was an increase in the quality of the displayed image, due to the exclusion of “jitter” of the prisms and a more reliable fixation of the position of the axis of the prism in the period between turns.

The problem is solved, and the technical results are achieved thanks to improvements in the mechanism of rotation of the prism in the advertising installation, containing mounted on the drive shaft perpendicular to the axis of the prism, the drive link in the form of a pair of disk cams interacting with the spindles of the driven sprocket wheel, rigidly fixed to the axis of the prism, and mobile communication means of the driving and driven links formed by the axial protrusion of the pinwheel located in the annular groove between the disk cams.

The mentioned improvements, according to the claimed invention, consist in the fact that the means of mobile communication further comprises radial, protruding between the disk cams, ring protrusions relative to the drive shaft, in the groove between which is located the end of the prism axis passed through the through axial hole of the pinion wheel and its axial protrusion wherein the outer surfaces of the radial annular protrusions and the end surface of the axial protrusion of the pin wheel interacting with them are formed spherical kinematic pair.

The axial protrusion is located along the axis of rotation of the pinion wheel. In the simplest case, the axial protrusion can be made in the form of a body of revolution with an axis coinciding with the axis of rotation of the pinion wheel, for example, in the form of a cylinder, as in the closest analogue. In more preferred cases, the axial protrusion is made in the form of a regular prism, at least in its end part (see below).

Unlike the closest analogue, where the axial protrusion of the pinwheel has a flat end surface and contacts the cylindrical surface of the drive link only along the line, the proposed design of the rotation mechanism significantly increased the contact area between the driven and drive links. Contact is made over the surface, both contacting surfaces having a spherical shape, as a result of which they form a spherical kinematic pair between themselves, which ensures a more stable vertical position of the prism axis. With any, even significant, deviation of the prism axis, and hence the axis of the driven link, from verticality, a quick restoration of its vertical position occurs. The stability of the mutual arrangement of the driven and the leading links ensures high-quality engagement between them, necessary for the rotation of the prism.

Unlike the closest analogue, in the claimed design, the mobile communication device not only prevents the drive link from shifting relative to the driven along the drive shaft, but also helps to maintain the vertical position of the prism axis and its perpendicularity to the drive shaft during rotation when there is no two-way support contact of the driven wheel with diametrical planes of the drive discs.

Another distinctive feature of the claimed design is that the axis of the prism is passed through through the axial hole of the driven link, and its end is placed in an annular groove between the radial annular protrusions. As a result, an additional connection is formed, which helps to increase the stability of the mutual arrangement of the leading and driven links.

All newly formed the above-mentioned connections (distinguishing features of the proposed solution) work throughout the entire rotation cycle of the drive shaft, including during the rotation of the prisms, providing in the aggregate, a significant increase in the reliability of the retention of the prism, especially at the time of its rotation, eliminates the violation of the relative position of the follower and lead links. The result is the stability and uninterrupted operation of the rotation mechanism, and hence the advertising installation as a whole.

The first disk cam is made with engagement elements in the form of three open U-shaped grooves along the edge of the disk and protrusions located between them on the outer surface of the disk. The second disk cam is made with a cutout of the peripheral part in a sector corresponding to the arrangement of engagement elements on the first disk cam. The presence of such a cut-out provides the possibility of unhindered passage of the lugs when turning the lug wheel.

To ensure smooth entry and exit of the links, it is preferable that bevels along the thickness of the disk cam are made at the entrance and exit of the extreme U-shaped grooves.

In a preferred embodiment of the inventive mechanism, the outer surface of the axial protrusion of the pinwheel, at least in its end part, is multifaceted, and hubs are formed on the inner side of the disk cams, the diametric planes of which contact with opposite faces of the axial protrusion during image demonstration between the turns of the prism . The presence of such a planar contact between the leading and the driven links provides a reliable fixation of the position of the axis of the prism in the period between turns, i.e. when the advertising image is being displayed. As a result, “jitter of prisms” is excluded, the clarity of the displayed image is ensured.

In order to be able to rotate the sprocket wheel with such a faceted protrusion in the hubs, samples were made in the zones corresponding to the arrangement of the engagement and cutout elements on the disk cams.

Thus, in the proposed solution, in contrast to other known ones, the axial protrusion of the driven sprocket wheel performs three functions at once. It prevents the displacement of the driving link along the drive shaft, helps to maintain the vertical axis of the prism and provides a fixation of the position of the axis of the prism during the demonstration due to the planar contact of its faces with the diametrical planes of the hubs of the driving disks. Moreover, the solution is simple and technological.

Most widely used in advertising installations are trihedral prisms, which are successively rotated 120 ° to change advertising images, see the example below. In the mechanism of rotation of the trihedral prism, the sprocket wheel has six sprockets, evenly spaced around the circumference of the concentric axis of the prism. The sprockets are made so that immediately upon completion of the turn, four of the six sprockets are set to the position of the contact contact with the inner diametric planes of the disk cams, and the two remaining sprockets are placed in the position of the contact contact with the outer diametric planes of the drive cams.

The driven and driving links are made in the form of solid parts.

Disk cams and radial annular protrusions of the driving link are formed on one common axis-sleeve, the axial hole of which allows its installation on the drive shaft.

The drive shaft usually has a cross-section in the form of a polyhedron, the axial hole of the drive link should be made with a reciprocal shape. The prism axis can also be made with a cross section in the form of a regular polyhedron, while the axial hole of the driven link has a reciprocal shape.

The drive of advertising installations is open and subject to intense dust pollution, therefore it is impossible to use lubricant in it, which means that drive parts must have high antifriction properties.

The driven unit has a lower mass and a larger contact surface area than the leading one. As a result, the driven link has a shorter service life and reaches a critical percentage of wear faster, which means it requires more frequent replacement. More equivalent service life of the driven and leading links of the mechanism would allow to increase the overhaul period of the advertising installation and reduce the cost of its maintenance. To this end, it is preferable to manufacture the driven link from a more wear-resistant material.

So, for example, for the manufacture of the driven and leading links can be used polymeric materials based on polyamide and polypropylene. Polyamide and polypropylene have different chemical compositions and, as a result, different physical properties: friction coefficients, shrinkage coefficients, thermodynamic properties, and as a result are subject to abrasion and wear to varying degrees, which allows achieving approximately the same service life of parts.

The proposed rotation mechanism is able to operate in reverse mode and rotate prisms in one or the other direction, due to only a change in the direction of rotation of the drive shaft. This eliminates one-sided wear of drive parts, prolongs their service life, and extends the capabilities of an advertising installation.

The following example illustrates the preferred implementation of the proposed technical solution, but does not limit the possibility of its use, for example, in the mechanisms of rotation of prisms with a different number of faces.

Brief Description of the Drawings

The claimed technical solution is illustrated by drawings, which depict:

Figure 1 - prism rotation mechanism, general view;

figure 2 - driven link, isometry;

figure 3 - leading link, isometry;

figure 4 - rotation mechanism in the "display image";

figure 5 is a section aa from figure 4;

figure 6 - mechanism in the process of rotation of the prism, with a partial cross section;

The implementation of the invention

The proposed rotation mechanism can be applied in well-known advertising installations with an information field formed from a series of vertically mounted prisms that can be rotated around its own axis, on the edges of which components of advertising images are applied, successively replacing each other when the prisms are rotated.

In a specific embodiment, the apparatus comprises trihedral prisms. Image change is carried out by rotating prisms by 120 °. The rotation is carried out at specified intervals of the exposure (demonstration, display) of the advertising image specified by the programmable processor. The total exposure time and prism rotation corresponds to the time during which the drive shaft makes a complete revolution. The axis of the drive shaft is perpendicular to the axes of the prisms.

The proposed rotation mechanism comprises (see Fig. 1) a drive link mounted on the drive shaft 1 in the form of double disk cams 2 and 3 with engagement elements, and a driven pinion wheel 6 with an axial protrusion 7 made in the form rigidly fixed to the axis 4 of the prism 5 a regular hexagonal prism, at least in its end part, and with teeth, otherwise, with a pin 8, evenly spaced around the circumference of the concentric axis 4 (figure 2).

At the end of the axial protrusion 7, a recess 9 is formed with a spherically concave surface, with which it rests on the radial annular protrusions 10 and 11 located between the disk cams 2 and 3 (hereinafter simply referred to as disks 2 and 3) and made with a spherically convex outer surface.

The axis 4 of the prism 5 is passed through the through axial hole 12 of the driven link 6, the end of the axis 4 is placed in the annular groove 13 between the annular protrusions 10 and 11.

In a specific example, the cross section of the axis 4 has the shape of a regular triangle, the hole 12 has a reciprocal shape. In order to increase reliability, the axis 4, the protrusion 7 and the hole 12 can be made along the length of the stepped shape.

The leading link, as well as the slave, is made in the form of a single solid-cast part (see figure 3). The engagement elements of the driving link are made in the form of three open U-shaped grooves 14 formed along the edge of the disk 2 and located between them on the outer surface of the disk of the protrusions 15. On the disk 3 in the sector corresponding to the location of the engagement elements on the disk 2, a peripheral cutout 16 is made parts of the disk. The disks 2 and 3 and the annular protrusions 10 and 11 are connected by means of a common axis 17 made with a Central hole, providing the installation of the drive link on the shaft 1. On the inner side of the disks 2 and 3, hubs 18 and 19 are formed, respectively. In the sector corresponding to the location of the grooves 14 and the protrusions 15 on the disk 2 and the cut-out 16 on the disk 3, thickness samples 20 are made in the hubs so that the pinion wheel 6 can be rotated with the faceted protrusion 7.

Advertising installation works as follows.

When the engine is turned on, the rotation is transmitted to the hexagonal drive shaft 1 and further to the driving links located on the shaft, the number of which corresponds to the number of prisms of the advertising installation.

On the part of the rotation of the shaft 1, the prisms 5 are in a resting position, exposure, demonstration of an advertising image is carried out (see figure 1 and figure 4). At this time, the gearwheels 8 of the wheel 6 are in a position of contact contact with the diametrical planes of the disks 2 and 3: four of the six gearwheels are in contact with the inner diametrical planes 21 and 22 of the disks, and the remaining two are in contact with the outer diametrical planes 23 and 24 (see Fig. 5). In this case, the opposite faces of the axial protrusion 7 are in contact with the diametrical planes of the hubs 18 and 19 of the disks 2 and 3. The reference contacts are stored until the start of the rotation of the prisms.

At a certain position of the drive shaft 1, the engagement elements of the disk 2 are suitable for the gears 8 of the wheel 6. One of the gears falls into the first open groove 14, the first protrusion 15 acts on it, helping to turn the gear wheel 6, and hence the prism 5, on the axis 4 of which it is fixed. The rotation of the prisms and the change of the advertising image begin. When this disk 3 is turned to the sprocket wheel 6 with its notch 16, which provides the possibility of passing the sprocket 8 of the wheel 6 when it is rotated. The axial protrusion 7 is also freed from contact with the diametrical planes of the hubs 18 and 19 of the disks 2 and 3, because at this moment, they are oriented toward it with their own samples 20, which makes it possible to freely turn the protrusion 7. To ensure smooth interaction between the engaging elements of the disk cams and the sprockets of the driven wheel, bevels 25 are made along the thickness of the disk at the input and output of the extreme U-shaped grooves 14. Such a constructive solution provides a smooth entry of the spindles into engagement with the leading link and a smooth exit from it.

At the time of the rotation of the prisms, there are no supporting bilateral contacts of the forearm 8 and the faces of the axial protrusion 7 with the driving disks 2 and 3. At this time, the axis 4 of the prism 5 is held in a vertical position by placing the end of the axis 4 in the annular groove 13 between the protrusions 10 and 11, and also due to the work of a spherical kinematic pair formed by a recess 9 at the end of the ledge 7 of the driven unit and interacting with it ring protrusions 10 and 11 of the leading link.

When the axis 4 of the prism 5 deviates from the vertical position, its verticality is rapidly restored. As a result, high-quality engagement between the driving and driven links is guaranteed, which means stability and uninterrupted operation of the rotation mechanism and the installation as a whole.

The contact area between the driven and the leading links is significant and this contact between the links is maintained for a full revolution of the drive shaft 1.

Immediately upon completion of the turn, four of the six tsavs are installed in the position of the contact contact with the inner diametric planes of the disk cams, and the two remaining tsavoks are in the position of the contact contact with the external diametrical planes of the disks, and the axial protrusion is in the contact position of its faces with the diametrical surfaces of the disks provides a stable and reliable position of the prisms and eliminates their "jitter" in the process of demonstrating the image.

The prism rotation mechanism does not require lubricants, as for the manufacture of links materials that are not susceptible to corrosion and oxidation, for example plastics based on polyamide and polypropylene, are used.

The driven link is made of a more wear-resistant material than the leading one, which ensures the simultaneous achievement of critical wear by the links, so that the replacement of the working parts of the mechanism can be carried out simultaneously.

The mechanism of rotation of the prisms provides the possibility of rotation of the prisms in one direction or the other (reverse mode of operation). It is enough to change the direction of rotation of the drive shaft. Reverse mode is also set by the processor. The presence of a reverse mode of operation allows not to show the side of the prisms that is free of advertising images, and also ensures uniform wear of the surfaces of the working mechanisms.

Claims (8)

1. The mechanism of rotation of the prism in an advertising installation, containing mounted on the drive shaft perpendicular to the axis of the prism, a driving link in the form of a pair of disk cams interacting with the sprockets of the driven sprocket wheel, rigidly fixed to the prism axis, and a means of mobile communication formed by the axial protrusion of the sprocket wheel placed in an annular groove between the disk cams, characterized in that the means of mobile communication includes located between the disk cams radial relative to the drive shaft e protrusions, in the groove between which is located the end of the axis of the prism passed through the through axial hole of the pinwheel and its axial protrusion, while the outer surfaces of the radial annular protrusions and the end face of the axial protrusion of the pinwheel interacting with them are made with the formation of a spherical kinematic pair. 2. The mechanism according to claim 1, characterized in that the first disk cam is made with engagement elements in the form of three open U-shaped grooves along the edge of the disk and protrusions located between them on the outer surface of the disk, while the second disk cam is made with a cutout of the peripheral part in the sector corresponding to the location of the engagement elements on the first disk cam, providing the ability to rotate the pinion wheel. 3. The mechanism according to claim 2, characterized in that the outer surface of the axial protrusion of the pinwheel, at least in its end part, is multifaceted, and hubs are formed on the inner side of the disk cams, which are capable of supporting contact of their diametrical planes with axial faces protrusions, while in the area corresponding to the location of the engagement and cutout elements on the disk cams, the thickness samples are made in the hubs to allow rotation of the pinion wheel. 4. The mechanism according to claim 1, characterized in that the sprocket wheel is made with six sprockets, evenly spaced around the circumference of the concentric axis of the prism, and configured to simultaneously immediately after completing the rotation of the contact contact of four of the six sprockets with the inner diametrical planes of the disk cams and the remaining two tsevok - with their outer diametrical planes. 5. The mechanism according to claim 1, characterized in that the drive link is made in the form of a single solid piece, in which the disk cams and radial ring protrusions are formed on a common axis, made with the possibility of installation on the drive shaft. 6. The mechanism according to claim 1, characterized in that the driven sprocket wheel is made of a more wear-resistant material than the drive link. 7. The mechanism according to claim 2, characterized in that at the input and output of the extreme U-shaped grooves, bevels are made along the thickness of the disk cam. 8. The mechanism according to claim 1, characterized in that the axis of the prism is made with a cross section in the form of a regular polyhedron, while the axial hole of the pin wheel is reciprocal.

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