GB2231113A

GB2231113A - Arrangement for securing a roller pin

Info

Publication number: GB2231113A
Application number: GB9008705A
Authority: GB
Inventors: Martin Storz
Original assignee: MICO IND AUTOMATION
Current assignee: MICO IND AUTOMATION
Priority date: 1989-04-19
Filing date: 1990-04-18
Publication date: 1990-11-07
Anticipated expiration: 2010-04-18
Also published as: IT1229372B; GB9008705D0; DE3912836A1; FR2646215B1; GB2231113B; FR2646215A1; DE3912836C2; IT8920680A0

Description

1 Arrangement for Securing a Roller Pin :;R ----3:L IL I- n The invention

relates to an arrangement for securing a roller pin, in particular a roller pin of uniform flexural strength, which is inserted from above in recessed fashion into the rotary plate of a rotary indexing table and, at its upper end, has a countersunk flange and, at its lower end, has the roller for engagement in a cam mechanism by which the rotary plate can be driven.

Preferred cam mechanisms are cylinder cam mechanisms in which the number of rollers arranged on corresponding pins following one another in the circumferential direction is equal to the number of stations or must be divisible by the latter to produce an even number, the stations being arranged spaced apart in the circumferential direction of the rotary plate and possibly being working or processing stations for a very wide variety of purposes.

Such an arrangement of the requisite number of roller pins is all the more difficult, the smaller the distance between the two axes of the cylinder cam mechanism on the one hand and of the rotary plate of the rotary indexing table on the other hand.

In a known arrangement of the design mentioned, the diameter of the flange is relatively large since through-bores must be present in it for the passage of fastening screws by means of which the flange is secured in a corresponding cylindrical recess at the upper side of the rotary plate. fillister screws usually being used for this. For this reason, depending on the diameter of the fillister screws. it is not possible to go below a certain diameter of the flange of the. roller pin, the minimum spacing of the roller pins in the circumferential direction being in turn determined by the diameter of the flanges.

The object on which the invention is based is regarded as the creation of an arrangement of the type mentioned which makes it possible to bring the roller pins even closer together, i.e. to reduce their spacing in the circumferential direction of the rotary plate or is axial direction of the cam mechanism, in particular cylinder cam mechanism. This object is achieved according to the invention by the fact that the flange is countersunk into the rotary plate to such an extent that space for an internal thread remains between its upper side and the surface of the rotary plate and that a threaded piece for clamping the flange can be screwed into this internal thread.

The abandonment of the fillister screws for securing the flange in the rotary plate makes possible a reduction of the diameter of the flange without going below the requisite clamping area, i.e. the area of contact between flange on the one hand and rotary plate on the other hand. This reduction of the flange diameter -made possible by the invention leads to the possibility of moving the roller pins closer together, this leading in the final analysis to the possibility of increasing the number of working or processing stations and increasing the efficiency of the rotary indexing table per revolution.

The threaded piece is expediently recessed relative to the surface of the rotary plate, the surface of the rotary plate thus having no obstacles due to any projecting threaded pieces. Of course, it might also be sufficient if the surfaces of rotary plates and threaded pieces lie in the same plane, i.e. are flush.

The threaded piece is preferably a screw with a hexagon socket, the diameter of which need not be significantly larger than the diameter of the flange of the roller pin.

In order furthermore to guarantee that the flange, together with the roller pin,,. cannot rotate relative to the rotary plate, the flange preferably has at least one through-bore parallel to the pin axis and a peg which passes through this bore and engages in a coaxial blind bore in the rotary plate.

The invention and its advantageous embodiments are explained in greater detail below with reference to an illustrative embodiment represented in the drawing, :L 1 1 1 1 1 in which:

Figure 1 shows a side view of the rotary plate of a rotary indexing table having a cylinder cam mechanism, partially in section; Figure 2 shows an enlarged cutaway portion from Figure 1 with an additional section through the threaded piece clamping the flange of the roller pin in the rotary plate.

Figure 1 shows in cutaway view the rotary plate 4 of a rotary indexing table 10, which can be rotated about a main axis B. It is driven by a cylinder cam mechanism 11 having a cylinder 12 which is arranged in a manner fixed in terms of rotation on an axle shaft 13 which rotates about an axis A which, in this case, is arranged perpendicularly to the plane of the paper. The distance between the axes is designated a.

The cylinder 12 has a cylinder cam 1 which. in this case, is formed by a bead 3 which is enclosed by two rollers 2. The second roller is situated behind the roller discernible from the figure and is therefore not visible.

Like all the other rollers which are not shown, the visible roller 2 is seated in coaxially rotatable fashion on the lower end 14 of a roller pin 5, which is inserted from above into the rotary plate 4 of the rotary indexing table 10 in recessed fashion and, at its upper end 15, has a flange 8 for securing it in the rotary plate 4.

According to the invention, the pin 5 with its flange 8 is counter-sunk into the rotary plate 4 to such an extent that space for an internal thread 18 remains between its upper side 16 and the surface 17 of the rotary plate 4,, into which internal thread a threaded piece 6 for clamping the flange 8 can be screwed. The threaded piece 6 is also recessed relative to the surface 17 of the rotary plate 4, with the result that the surface 17 has no obstacle to the arrangement of workpieces or the like.

As can be discerned with particular clarity from Figure 2, the threaded piece 6 is expediently a screw with a hexagon socket 19 and clamps the flange 8 on the shoulder 20 of the recess 21, accommodating the said flange, in the rotary plate 4.

The flange 8 of the roller pin 5 has at least one through-bore 22 parallel to the pin axis C and a peg 7 which passes through this bore 22 and engages in a coaxial blind bore 23 in the rotary plate 4.

The diameter of the peg 19 is sufficiently small not to hinder the desired reduction of the diameter D of the flange 8 to a value necessary to guarantee the required clamping surface.

ir; 1 7" 4; t _. R - 1). The claims f iled with the application and in the course of the proceedings are provisional formulations without prejudice to the achievement of further-reaching patent protection.

2) References back to the main claim used in the subclaims indicate the further development of the subject-matter of the main claim by the features of the respective subclaim; they are not to be taken as a relinquishment of the achievement of independent substantive protection for the features of the subclaims referring back.

3) The applicant reserves the right to claim further features of inventive significance as yet only disclosed in the description.

1

Claims

CLAIMS:

1. Arrangement for securing a roller pin, which is inserted from above in recessed fashion into the rotary plate of a rotary indexing table and, at its upper end, has a countersunk flange and,. at its lower end, has a roller for engagement with a cam mechanism by which the rotary plate can be driven, wherein the flange is countersunk into the rotary plate to such an extent that space for an internal thread remains between its upper face and the surface of the rotary plate, and a threaded piece for clamping the flange can be screwed into this internal thread.

2. Arrangement according to claim 1, wherein the threaded piece is recessed relative to the surface of the rotary plate.

3. Arrangement according to claim 1 or 2, wherein the threaded piece is a screw threaded plug with a hexagon socket.

4. Arrangement according to claim 1, 2 or 3, wherein.

the flange of the roller pin has at least one throughbore parallel to the pin axis and a peg passes through this bore and engages in a coaxial blind bore in the rotary plate.

j i 1 k 1 F 1

5. A device including a member having a flat surface portion, wherein a headed pin member is countersunk with respect to said flat surface portion with the head of the pin member disposed in a counterbore portion of a bore in said member and a clamping member for clampingly engaging the head of the pin is threadingly engaged in said counterbore portion so as to be below, or level with, said flat surface portion.

6. An arrangement, or device, substantially as hereinbefore described with reference to the accompanying drawings.

Published 1990 atThePateritoffice, State House, 66.71 High Holborn, LondonWC1R4TP. Further copies maybe obtainedfrom, The Patent=ce. Sales Branch, St Mary Cray, Orpington. Kent BRS 3RD. Printed by Multiplex techniques ltd. St Mary Cray. Kent, Con. 1187