DE1271513B - Hammering machine with a rotating flywheel - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 21 j

German class: 49 h -3/02

Number: 1271513

File number: P 12 71 513.8-14

Filing date: May 10, 1963

Opening day: June 27, 1968

The invention relates to a hammering machine with a rotating flywheel that has a centric The wreath lying on the axis of rotation carries rollers on the heads of a hammer head fixed to the machine radially displaceable guided, spring-loaded punches against the direction of the spring force act, and with a return member engaging under the heads of the punches, which then to a striking process a positive fit between punch heads supporting the spring force and flywheel rollers.

There is already a hammering machine known in which the punch without using a Return element only reach their starting position under the action of spring forces. When occurring however, the spring force of these non-positive ones is sufficient for additional forces when the stamps are jammed Provision is often not enough to ensure repatriation.

In the case of a hammering machine that is also known, such malfunctions are avoided a form-fitting provision for application. Here, a cam ring engages directly under you Part of the punch head and inevitably pushes it outwards. This cam ring is as a separate revolving part and therefore requires an additional gear to achieve the speed required there to raise. The construction effort is therefore very expensive, with a high level of wear and tear due to the high Gleitgeschwindigket between the cam ring and punch head, noticeable disadvantageous power.

The object of the invention is to create a hammering machine in which, while avoiding a large structural effort, the force-fit return of the punch with support a positive restoring member takes place.

This is achieved according to the invention in that each punch has a separate, off-center attack Returning member is assigned, which with one end, seen in the direction of rotation of the rollers, protrudes behind the head of the associated punch into the path of the rollers. Through this reliable operation is made possible with little technical effort. Because the individual Restoring organs only intervene to support the spring force, they are low loads and accordingly exposed to little wear. Furthermore, these return organs do not require any drive means adapted to the roller circulation. The eccentric attack also enables an extremely easy storage.

Hammering machine

with a rotating flywheel

Applicant:

Stevens & Bullivant Ltd.,
Birmingham (Great Britain)

Representative:

Dipl.-Ing. R. Beetz

and Dipl.-Ing. K. Lamprecht, patent attorneys,

8000 Munich 22, Steinsdorfstr. 10

Named as inventor:

Samuel Smith,

Elmdon, Warwick (Great Britain)

Claimed priority:

Great Britain May 30, 1962 (20 717)

Another advantageous embodiment of the invention is that the restoring members in the hammer head are pivotably mounted angle levers.

To explain the invention and its practical application, one is illustrated in the drawing Embodiment of a hammering machine according to the invention described. The only Figure shows a schematic front view of the hammer mechanism, provided in the return organs are.

In the embodiment of a hammering machine selected as an example, a rotatable flywheel α is equipped with rollers α ¹ , Φ arranged on a wreath, which act on a stationary hammer head b , in which the radial sliding hammer c is guided ^{with hammer members c 1} seated at their inner ends , which can be moved by the rollers α for pressing or forging action on the workpiece. The punches c have a right-angled cross-section and can be moved in radially arranged sliding guides of the head b ; they are finally covered by a cover piece, not shown in the drawing, so that they can only be displaced in the radial direction, but cannot perform any lateral movements.

Each punch c is provided at its outer end with a curved or curved head part c ² , which on both sides over the rectangular cross-section

809 567/299

of the block c protrudes and has flats c ^s on its underside. This arched head ² is normally with a small clearance in front of a corresponding flat stop surface b ¹ on the stationary head b; below the head c each punch c two or more compression springs d are provided which engage in blind bores b ² in the fixed head b , the depth of which is relatively large. These compression springs press the punches outwards via pressure pieces d ^1. The inner end of each punch c in turn has the shape of a head extension c ⁴ , which is supported with rear shoulders on the adjacent part b ^{3 of} the fixed head b of the machine. In the middle, the head extension c ^{4 of} the punch has a cavity which is undercut so that a hammer c ¹ provided with flanges or keyways can be fixed in the recess. This latter type of fixing is used in the embodiment with four hammers.

The machine chosen as an example is particularly suitable for, for example, the four-sided flattened machine End of a tool, such as a turning tool or similar tool to shape.

Every second roller designated a ² has a circumferential groove in a manner known per se, it can therefore run over the curved heads c ^{2 of} the punch without moving the punch, so that, for example, the two vertical punch c work simultaneously and after a certain amount Time span the two horizontal punches. The punches are returned after their working stroke by the compression springs d , which allow the punches to be pushed radially outward until they stop, so that their head-like extensions c ⁴ are supported on the fixed stop surfaces b ^{3 of} the stationary head b of the machine.

It has been shown in practice that occasionally one or the other punch stops in its working position because the springs easily jam. In order to counteract this tendency to jam, each punch c is assigned a pivotable cam e in the form of a strongly rounded angle lever. One arm e ^{1 of} the cam e lies under the rear edge c ^{3 of} the arched head c ^{2 of} the punch c, while the end of the other arm e ^{2 of} the cam is normally in the path of the rollers a ¹ and is pivoted in this way by the rollers α ¹ is that the cam forcibly retrieves the punch c from its advanced position. This support of the retraction movement of the punches c takes place by the rollers a ¹ running onto the arms e ^{2 of} the cams e, since these arms e ² protrude into the path of the rollers a ¹ when the punch is in the advanced position. The cams e, which rotate around the pin e ⁱ , each press with their cam arm c ¹ under the rear flange of the punch head c ² and thus push the punch with great force into its retracted position.

The width of the cams e, which are mounted in recesses ί> ^{4 of} the stationary head b , is only so large that the rollers a ~ provided with circumferential grooves run over the arms e ^{2 of} the cams e without actuating these cams, and the Bearing journals e ^{4 of} the cams can be in the form of cylindrical journals which are mounted in corresponding bores in the fixed head of the machine.

Claims (2)

Patent claims: 1. Hammering machine with a revolving flywheel, which carries a ring of rollers centrically to the axis of rotation, which act on the heads of spring-loaded punches, which are guided radially displaceably in a hammer head fixed to the machine, against the direction of the spring force, and with a return element engaging under the heads of the punches, which, following a striking process, produces a positive fit between the punch heads and the flywheel rollers that supports the spring force, characterized in that each punch (c) is assigned a separate, off-center return element (e) , which has one end (e ² ) in the direction of rotation of the rollers (d) , behind the head (c ² ) of the associated punch (c ) protrudes into the path of the rollers (a ^1). 2. Hammering machine according to claim 1, characterized in that the restoring members in the hammer head (δ) are pivotably mounted angle levers (e) . Considered publications: Austrian patent specification No. 214 231,
202; British Patent No. 860,519;
U.S. Patent No. 2790188. 1 sheet of drawings 809 567/299 6.68 © Bundesdruckerei Berlin