DE1166136B - Double-armed drive lever for wire bending machine - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL Boarding school Class: B21f

Number: File number: Registration date: Display day:

German class: 7 d -1

1 166 136
S47113Ib / 7d
January 18, 1956
March 26, 1964

The invention relates to a double-armed, pivotably mounted on a machine fixed point Drive lever in one equipped with counter-rotating, cam-controlled bending tools Wire bending machine and relates to such a lever, one arm of which by the rotating cams is acted upon and whose other arm is displaceable in a plane parallel to the camshaft Bending tool conveys its power stroke, whereby to adapt the machine to changing wire thicknesses the degree of deflection of the double lever due to the displacement of a pivot mounted on the lever Part can be changed by means of an adjusting screw.

It is known to use double-armed levers for actuating the pressing tools in wire bending machines use which are acted upon by a cam on one arm and the corresponding one on the other arm Carry pressing tools or act with this on the tools. It is about change of the working stroke of the tools known to change the degree of deflection of the levers that one of the arms can be changed in its angular position to the other arm by means of an adjusting screw.

When using the usually rigid angle lever, a very precise setting is required necessary to avoid overstressing the double lever or the bearings or others in the movement to avoid participating components. This lack of "movement tolerance" is also a very frequent readjustment to compensate for the considerable amount of wire processing machines of this type Wear and tear necessary.

In order to avoid this, it is known in embossing presses to use a certain "overstroke" in the punch drive. to be provided, which is made possible by a spring element, which the overmovement of the drive elements records.

It is the special task on which the invention is based, one that enables an "overstroke" To create arrangement in the double lever drive in question for wire machines.

According to the invention, this is achieved in that the usual intervention in a breakthrough of the bending tool this acting part of the double-armed lever from one to one The pivot point of the lever body is pivotable, resiliently flexible rod, which is supported by a on the lever body and adjusting screw seated approximately in the vicinity of the pivot point can be supported against the working pressure and can be pressed against the bending tool.

Double-armed drive lever
for wire bending machine

Applicant:

Saginaw Wire Products, Inc., Saginaw, Mich.

(V. St. A.)

Representative:

Dipl.-Ing. L. Hirmer, patent attorney,

Berlin 31, Katharinenstr. 21

Named as inventor:

Joseph Herman Hear, Saginaw, Mich. (V. St. A.)

Claimed priority:

V. St. v. America January 20, 1955

(482 940)

With this arrangement according to the invention, due to the ability to bend the one lever arm forming flexible rod by means of the adjusting screw a simple adaptability of the machine on different wire thicknesses possible, while on the other hand due to the resilient flexibility This rod allows the setting of a small "overstroke" due to the small differences in wire thickness and wear and tear is automatically compensated and overstressing is avoided.

The flexible rod is preferably supported by a spring-loaded pin can be permanently pressed against the bending tool in a non-positive manner. This prevents that by inertia of the bending tool or by frictional resistance in its guides Drive lever is lifted off the tool during the return stroke, which leads to increased wear and tear in particular leads to a considerable amount of noise.

The invention is explained in more detail with reference to the drawing using an exemplary embodiment.

F i g. 1 shows, partially in section, the arrangement of a double-arm lever according to the invention for driving a wire bending machine;

F i g. 2 shows a view of the double-arm lever designed according to the invention from the left in FIG. 1.

As in Fig. 1, tool carriers 2 are screwed to the machine frame, on which in T-slot hammer head screws for fastening

409 540/113

of tool holder guides 3 lie in which the tool holder 4 is displaceable in the longitudinal direction sit. At the front end of each tool holder 4 is a bending tool 5, for. B. as shown by Screw on, fastened, which cooperates with a corresponding counter holder 6 and thereby the wire 9 inserted through feed 8 between tool 5 and counter holder 6 accordingly forms.

The work force is transmitted to the tools by the drive cam 10, their shape and The diameter depends on the required lifting height of the tool. Each cam 10 consists of two parts screwed together at 11. The camshaft 12 has a plurality of splines 13 for Receipt of the wedge 14 so that their relative angular position to and their position along the shaft 12 is adjustable. A T-shaped longitudinal slot 15 is provided on the lower end face of the tool carrier 2, in which T-head bolts 16 are for fastening support arms 17. At the far end of the arm 17 on a pin 18 is mounted a lever body 19, one of which is a cam follower roller 20 supporting lever arm 21 protrudes. The lever body is on the side opposite the arm 21 19 is provided with a groove 22 in which a flexible rod 23 is mounted on a pin 24. Of the Rod 23 engages through slot 25 of tool holder guide 3 into a recess 26 in the tool holder 4, where its free end is positively connected to the tool holder via a pivot pin 27 supports. A standing under the tension of a spring 28 pin 29 presses the rod 23 in contact with the Pivot pin 27. This contact pressure is provided by a screw which forms the abutment for the spring 28 30 adjustable. The second arm also consists of the lever body 19 and the cam follower arm 21 existing double-armed, depending on the guide curve of the cam 10 around the pin 18 pivoting actuating lever forming rod 23 is made of steel with such a cross-section that it at Load can bend somewhat resiliently. Its angular position to the lever body 19 and thus to the cam follower arm 21 can be adjusted by a screw 31 by pivoting about the pin 24. Due to the bendability of the rod 23, differences in the thickness of the wire 9 and compensated for by certain stroke wear.

Claims (2)

Patent claims: 1. Double-armed lever pivotably mounted on a machine "fixed point" in one wire bending machine equipped with counter-rotating, cam-controlled bending tools, its one arm is acted upon by the revolving cam and the other arm in one to the camshaft plane parallel displaceable bending tool mediates its power stroke, wherein To adapt the machine to changing wire thicknesses, the degree of deflection of the double lever by displacing a part pivotably mounted on the lever by means of an adjusting screw is changeable, characterized in that the normal intervention in an opening of the bending tool (4,5) this acting part of the double-armed lever from a pivot point (24) of the Lever body (19) pivotable, flexible rod (23) is made by a in the lever body (19) and adjusting screw (31) seated approximately in the vicinity of the pivot point (24) can be supported with respect to the working pressure and can be pressed against the bending tool (4, 5). 2. Lever according to claim 1 in a machine with which can be moved back into the starting position by spring force Bending tools, characterized in that the flexible rod (23) is supported by an in the rear part of the bending tool (4, 5) seated spring-loaded (28) pin (29) can be permanently pressed against the bending tool (4, 5) in a non-positive manner is. Considered publications:
U.S. Patents Nos. 2,677,398, 1,663,663,
032, 819 623. 1 sheet of drawings 409 540/113 3.64 © Bundesdruckerei Berlin