Conveyor device with chain links driven by a toothed belt

Abstract: A conveyor device (1) comprises a conveyor belt (2) including a plurality of slidable links (3) which can slide on guiding elements (7,8,20), the conveyor belt being driven by a timing belt (5) through engagement elements (11) provided on each of the links, and designed for engaging the teeth (12) of the timing belt.

Description: BACKGROUND OF THE INVENTION The present invention relates to a conveyor device. More specifically, the present invention relates to a precision conveyor device, driven by a step motor, either or a DC type or of a brushless type. Prior conveyor belts, used in precision machining operations, for example to bring workpieces to a tool machine, must locate the workpiece in a very accurate manner with respect to the machining tool. The document US-A-5 394 978 discloses a conveyor device according to the preamble of claim 1. SUMMARY OF THE INVENTION The aim of the present invention is to provide a great precision or accuracy conveyor device. Within the scope of the above mentioned aim, a main object of the present invention is to provide such a conveyor device which can be used both on automatized processing lines and in individual machining apparatus, requiring the workpieces to be very accurately located. Another object of the present invention is to provide a conveyor device specifically suitable for conveying and locating movable elements, such as panels, section members or contoured elements, mechanisms, and so on. According to one aspect of the present invention, the above mentioned aim and objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by a conveyor device according to claim 1. BRIEF DESCRIPTION OF THE DRAWINGS Further characteristics and advantages of the present invention will become more apparent hereinafter from the following disclosure of a preferred, though not exclusive, embodiment of the invention, which is illustrated, by way of an indicative, but not limitative, example, in the accompanying drawings, where: Figure 1 is a perspective view of the conveyor device according to the present invention, being shown without the timing belt therefor; Figure 2 is a perspective view of the timing belt applied to the conveyor device according to the invention, being shown in its operating condition; Figure 3 is a schematic side elevation view of the conveyor device according to the invention, in which a portion of the conveyor belt is shown; Figure 4 is a view like figure 3 of the conveyor device according to the invention, in which is shown in a detailed manner the timing belt therefor; Figure 5 is a perspective view of three quarters of a link of the conveyor belt; Figure 6 is a bottom perspective view of a link of the conveyor belt; and Figure 7 is a top perspective view of a link of the conveyor belt. DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to the number references of the accompanying drawings, the conveyor device according to the invention, generally indicated by the reference number 1, comprises a conveyor belt 2, including a plurality of conveyor belt links 3 which can slide on guide means, comprising a frame 4, and being driven by a timing belt 5 also supported by said frame (4). Each link 3 comprises a supporting body 6 for a first pair of sliding bearings 7 having a horizontal axis, and a second pair of side guide bearings 8, having a vertical axis. Each link 3 is coupled to adjoining links by pivot pins 9 and corresponding rolling bush elements 10. Each link 3 is provided, at the bottom thereof, with a plurality of teeth 11, having a configuration and depth size corresponding to the configuration and size of the teeth 12 of the timing belt 5, thereby providing engagement means designed for engaging the teeth 12 of the timing belt. The timing belt 5 comprises a metal core, covered by reinforced plastic materials, and the teeth 12 thereof are outwardly directed. The timing belt 5 has a general outline as clearly shown in Figure 2. More specifically, the timing belt 5 slides on the frame 4, while defining at least a top flat trajectory, as guided on guiding or driving rollers 13, and being controlled by two end pulleys 14 and 15, at the end portions of its path or trajectory. At a middle region of the top flat trajectory, a toothed pulley 16 is provided, said toothed pulley being arranged at the bottom between a pair of flat pulleys 17 and 18 which, by cooperating with said pulley 16, causes the timing belt 5 to define a downward directed loop 19. The toothed pulley 16 is driven by driving means (not specifically shown), comprising a step motor, or a DC motor, or a brushless motor, through a suitable motor reducing unit. The number of the links 3 forming the conveyor belt 2 can be changed depending on the length of the conveyor belt, which slides along a sliding guide 20 of substantially oval shape, and extending on the periphery of the frame 4. The guide 20 comprises two rectilinear portions, respectively a top rectilinear portion 21 and a bottom rectilinear portion 22, connected by two semicircular portions 23 and 24. The guide 20 constitutes a track assembly, designed for engaging the guide bearings of the conveyor belt links 3, to allow the engagement means, constituted by the teeth 11 and links 3, to engage the teeth 12 of the timing belt 5 at least through the top rectilinear portion thereof. Thus, the timing belt 5 will operatively drive the conveyor belt 2, the links 3 of which are provided with supporting elements 25 for supporting an article to be conveyed (not shown). It has been found that the invention fully achieves the intended aim and objects. Actually, a conveyor device has been provided, which has been specifically designed for use on automatized processing lines, or in individual machines requiring to accurately operatively locate the workpieces to be processed. It should be apparent that the used materials, as well as the contingent shapes and size, can be any, depending on requirements and the status of the art.

Claims: A conveyor device (1) comprising a conveyor belt (2), including a plurality of links (3) slidable on guide means (4), said conveyor belt (2) being driven by a timing belt (5) through engagement means (11) provided on each of said links (3) and operable to engage the teeth (12) of the timing belt, characterized in that said timing belt (5) defines an operating trajectory comprising at least a top flat portion and at least a downward directed loop (19) at a middle position of said top flat portion. A conveyor device, according to Claim 1, characterized in that each link (3) comprises a supporting body (6) for a first pair of sliding bearings (7), of horizontal axis, and a second pair of side guiding bearings (8), having a vertical axis. A conveyor device, according to Claim 1, characterized in that each said link (3) is coupled to adjoining links (3) by pivot pins (9) and rolling bush elements (10). A conveyor device, according to Claim 1, characterized in that each link (3) is provided, at a bottom thereof, with a plurality of teeth (11) having a configuration and a depth size corresponding to a configuration and a size of the teeth (12) of the timing belt (5), thereby providing said engagement means for engaging said teeth (12) of the timing belt (5). A conveyor device, according to Claim 1, characterized in that said timing belt (5) comprises a metal core covered by reinforced plastic materials. A conveyor device, according to Claim 1, characterized in that said teeth (12) of said timing belt (5) are outward directed. A conveyor device, according to Claim 1, characterized in that said timing belt (5) slides on said frame (4), by defining at least a top flat trajectory, as guided by guide rollers (13), and being engaged by two end pulleys (14, 15), arranged at respective end portions of said trajectory. A conveyor device, according to Claim 7, characterized in that , at a middle region of said top flat trajectory, is provided a toothed pulley (16) arranged at a bottom between a pair of flat pulleys (17, 18) which cooperate with said toothed pulley (16) to cause said timing belt (5) to form a downward directed loop. A conveyor device, according to Claim 8, characterized in that said toothed pulley (16) is driven by motor means, comprising either a step motor, a DC motor, or a brushless motor. A conveyor device, according to Claim 1, characterized in that a number of said links (3) forming said conveyor belt (2) can be changed depending on a desired length of said conveyor belt (2), said conveyor belt sliding along a substantially oval guide. (20) peripherically arranged of said frame (4), said guide (20) comprising two rectilinear portions (21, 22), i.e. top (21) and a bottom (22) rectilinear portions, coupled by two semicircular portions (23, 24). A conveyor device, according to Claim 10, characterized in that said guide (20) provides a track, operating to engage the guide bearings of the links (3) of said conveyor belt, to allow said engagement means, constituted by said teeth (11) and said links (3), to engage the teeth (12) of said timing belt (5) at least along a top rectilinear portion thereof. A conveyor device, according to Claim 1, characterized in that said links (3) are provided with supporting elements for supporting an article to be conveyed.

Inventors: REGUZZI LUIGI, REGUZZI, LUIGI
Applicants: RE M S R L, RE.M.S.R.L.
Application year: 2001
Main classification: B23Q7
IPC codes: B65G23