EP3056108A1

EP3056108A1 - Pneumatic mechanism for placing washers and eyelets

Info

Publication number: EP3056108A1
Application number: EP14851630.5A
Authority: EP
Inventors: Vicente Coves VICENTE
Original assignee: Jopevi SL
Current assignee: Jopevi SL
Priority date: 2013-10-08
Filing date: 2014-09-16
Publication date: 2016-08-17
Also published as: ES1093205Y; WO2015052363A1; EP3056108A4; ES1093205U

Abstract

This describes a mechanism for the placement of washers and eyelets, operated pneumatically, designed to perforate a support and place washers and eyelets in the perforations made, which consists of a first shaft-piston sub-assembly (A), internally hollow, that includes a piston with a central hole for the passing of a threaded proximal end of a first shaft, a second shaft-piston sub-assembly (B), with a smaller diameter and longer than the first, housed concentrically and moving in the former, with a piston with a central hole for the passing of a threaded proximal end of a second shaft, and a third sub-assembly (C) that includes a pneumatic cylinder with a lid with a hole for air to pass to move the first and second sub-assemblies towards an external object to be perforated.

Description

Purpose of the invention

This invention refers to a pneumatic mechanism for the placement of washers and eyelets that provides essential innovative features and notable advantages over the devices currently known and used for the same purposes in the state of the technique.
The invention is for a pneumatic mechanism designed specifically for the proper functioning of machines for placing washers and eyelets on a support medium and for other, similar, applications, the machine being designed and built to obtain improvements and provide operational simplicity compared to other existing means for similar purposes.
The mechanism is designed for the proper placement of the eyelet-washer assembly on supports of various types and for making the necessary hole first. The mechanism is essentially based on the use of two pistons coupled to two concentric shafts of suitable sizes necessary to make the hole first and then correctly place the eyelet and the washer. These pistons are housed, as is usual, in a pneumatic cylinder of the pertinent dimensions.
The field of application for the invention is the footwear manufacturing industrial sector or other sectors in which components of the above mentioned type are used.

Background and summary of the invention

In the current state of the technique, a multitude of machines are known to exist, built for the placement of eyelets and washers, which make a hole before placement and then carry out the placement itself in correct and different ways.
In this sense, mention can be made of mechanisms that carry out the perforation and placement operations with two independent pneumatic cylinders but with the feature that a mechanism of this type has the disadvantage of a costly assembly due to the need to install two cylinders that must be properly adjusted independently.
Likewise, devices are known that solve the two independent actions by using an electric motor with a coupled shaft and eccentric cams designed for the purpose. These machines have the disadvantage of being very large and heavy with the additional disadvantage of requiring a complicated assembly since they include complex kinematic chains that are inappropriate for the necessary lower ranges of force.
The pneumatic mechanism in this invention has been designed with an innovative structure on the basis of which holes are made for the placement of eyelets and washers as well as the operation of placing eyelets and washers itself, undertaken quickly, effectively and simply.
The mechanism in the invention is essentially based on the use of a single cylinder containing two shafts coupled to two pistons with one of the shafts perforated and housing another shaft that acts in the same direction and concentrically, the desired movement of the second shaft being achieved by making a hole, of dimensions that vary according to the design features, made in one of the pistons, so that when the first shaft (perforator) hits its stop the second shaft continues its movement thanks to the air flow provided through that hole.

Brief description of the drawings

Other features and advantages of the invention are clearly evident from the detailed description that follows a preferred manufacturing method, taken together with the accompanying drawings in which:

Figure 1 shows a schematic view, as an exploded view, of the parts in the mechanism that forms the subject of this invention;
Figure 2 shows a schematic view, as an exploded view, of three sub-assemblies in the mechanism in the invention, identified successively as A, B and C;
Figure 3 shows a detail of the perforation made in a part of the piston together with an elevation view of a section on the line F-F, and
Figure 4 (diagrams 4.1 to 4.3) shows an operational sequence of movements made by the mechanism in the invention during its operation.

Description of a preferred form of manufacture

The following describes the preferred form of manufacturing the mechanism in the invention, solely as an illustration and not a limitation, by using the drawings included in this memorandum. Thus, referring firstly to Figure 1, a perspective exploded view can be seen of the components in the mechanism in the invention, including a pneumatic cylinder consisting of a sleeve 3, a first lid 1 and an opposing second lid 13, both lids being fixed to the sleeve 3 with bolts as is usual, with the sleeve 3 configured and sized to house, with the possibility of axial movement, a pair of pistons 5, 10, each fitted with a perimeter O- ring 6, 11, respectively, and each associated with a shaft 4, 8, respectively. The pistons 5, 10 have axial holes designed to allow the passing of a threaded part of the proximal end of each shaft 4, 8, these shafts being fixed to their respective pistons by nuts 7, 12. The passing of the part of shaft 8 through the axial hole in the piston 10 is preferably made with the insertion of a bush 9.
The relative coupling of the components described with regard to Figure 1 gives rise to three shaft-piston sub-assemblies shown schematically in Figure 2, identified with the letters A, B and C. Thus, sub-assembly A consists of the first shaft 4 fixed to the piston 5 and with the O-ring positioned on the perimeter of that piston 5; sub-assembly B consists of the second shaft 8 fixed to piston 10, this last with O-ring 11 fixed to its perimeter edge; finally, sub-assembly C consists of the pneumatic cylinder installed by coupling and connection of lids 1, 13 to the central sleeve 3. Lid 1 is provided with a central through hole marked with the numeric reference 1a while lid 13 is provided with an air through hole in one of its sides, which is not specifically shown in this figure.
As can be seen in Figures 1 and 2, the first shaft 4 has a noticeably larger diameter than the second shaft 8 and is hollow inside with an internal diameter sufficient to house concentrically and moveably the second shaft 8 inside it. The length of the smaller diameter second shaft 8 is greater than that of the first shaft 4 that houses it, the difference in length being sufficient for the second shaft 8 to protrude at the distal end of the first shaft 4 and can thus reach an objective before the first shaft 4.
In addition, it must be mentioned that piston 10 includes a small diameter hole through the thickness of its body in a position radially distant from the centre, shown in Figures 1 and 2 with the reference 14. Figure 3 shows this hole 14 more clearly and cross section F-F shows the through nature of the hole 14 through the thickness of piston 10.
It must also be clarified that the exploded view in Figure 2 is for illustrative purposes only since the assembly of the mechanism means that the first shaft-piston assembly is coupled to the second shaft-piston assembly by the insertion of the shaft 8 into shaft 4 and that both pistons 5, 10 are enclosed in the sleeve 3 of the cylinder, so that both concentric shafts 4, 8 project to the exterior through the central hole 1a in the lid 1 of the cylinder.
Turning now to Figure 4 in the drawings, this shows an operating sequence of the pneumatic mechanism in this invention. Drawings 4.1 to 4.3 in this sequence have eliminated the sleeve 3 of the cylinder to reveal the pistons inside the chamber and hole 15 made in the lid 13 for injecting air can be seen, which communicates with the space in the cylinder delimited by the sleeve 3 and also shows any object, identified with the reference 16, placed for the application of the successive operations of perforation and the placement of the washer and eyelet.
According to the initial phase of the sequence (drawing 4.1), this starts by injecting air through the hole 15 in the lid 13 of the cylinder to exert pressure and thrust on piston 10; the distal end of shaft 8, used as a perforating tool, is located opposite an object 16 on which the various operations are to be carried out.
Then, in drawing 4.2, the second phase of this operation process appears in which the pressure of the air injected in the previous phase through 15 in lid 13 has moved both pistons 10, 5 in the axial direction with the end of shaft 8 applied to the object 16 and perforating it.
Then, in drawing 4.3 for the third and final phase, the pressure of the air introduced continues to exert the relevant thrust so that, with piston 10 and its shaft 8 having reached the end of its travel, the air pressure exerted through hole 14 causes the movement of piston 5 with respect to piston 10, moving shaft 4 on shaft 8, concentric with the former, until the distal end of shaft 4 reaches the end of its travel against object 16, placing the washer and eyelet (not visible in the figure) inserted previously between both elements.
Thus the pneumatic mechanism in the invention achieves the objective of carrying out two essential operations for the purposes sought (perforation and placement) with a single pneumatic cylinder duly adjusted and regulated, quickly, simply and effectively.
It is not considered necessary to develop this description further so that an expert in the matter can understand the object described and the way in which to carry out its practical manufacture. However, it must be understood that this description refers only to a preferred form of manufacture and that it is therefore susceptible to a multitude of variations and modifications estimated within the ambit of the protection of the invention and limited only by the scope of the following claims.

Claims

Pneumatic mechanism for the placement of washers and eyelets, in particular a mechanism operated pneumatically and designed to carry out the successive operations of perforating a support and a washer and an eyelet in the perforation made, featuring a first shaft-piston sub-assembly (A) consisting of a piston (5) that includes a central hole for the passing of a threaded portion of the proximal end of a first shaft (4), the connection being made between the piston (5) and shaft (4) with a nut (7); a second sub-assembly (B), consisting of a piston (10) with central hole for the passing of a threaded portion of the proximal end of a second shaft (8), with the insertion of a bush (9) and fixed to the said piston (10) with a nut (12); and a third sub-assembly (C), consisting of a pneumatic cylinder, consisting of a sleeve (3) with an internal housing for both pistons (5, 10), closed at both ends with lids (1, 13), with the feature that each piston (5, 10) includes an O-ring (6, 11) around its perimeter; the second piston (10) includes a through hole (14) in a position radially separate from the centre of the piston and a lid (13) of the third sub-assembly (C) of a pneumatic cylinder includes a through hole (15) to the interior.
Mechanism in accordance with claim 1, with the feature that shaft 4 of the first shaft-piston sub-assembly (A) is hollow internally and because the shaft (8) of the second shaft-piston sub-assembly (B) is of a smaller diameter than the shaft (4) in the first shaft-piston sub-assembly (A) but is longer than it, being sized for fitting concentrically and moving in said hollow shaft (4) in the first sub-assembly (A) and protruding at the distal end with respect to this first shaft (4) in the condition of both shafts coupled.
Mechanism in accordance with claim 2, with the feature that the hole (15) communicates with the interior of the pneumatic cylinder consisting of the sub-assembly (C) and forming a passage for the injection of air to initially move both shaft-piston sub-assemblies (A, B) simultaneously to approach an external object (16) to be perforated and the later relative movement of the first shaft-piston sub-assembly (A) with respect to the second sub-assembly (B) during the placement of the washer and eyelet in the said external object (16).