JPS5811291B2 - Chien Wan Kiyoku Kikai - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a bending mandrel, which corresponds to the internal shape of the chain link, is provided with a longitudinal groove for accommodating the preceding chain link, and is fixed in position. A feed bush for the pin to be bent which is slidable along the mandrel, a holding member which presses the pin against this mandrel in the center of the mandrel, and a pin end movable tangentially with respect to the mandrel. The present invention relates to a chain bending machine comprising two bending blades for gripping parts, in which the holding member and the bending blades are forcibly actuable via a movement device.

In the known machine, a chain link is completed by first placing a pin in the front center of the mandrel and a retaining member forcing the pin into a forming groove in the mandrel, thereby forming a back bend in the link.

A bending blade then pushes the pin end from the side of the mandrel, causing the end to curve around the mandrel, while the retention member maintains the curvature of the back of the pin.

Then, after the chain link has been pre-shafted in a U-shape, the bending blades are guided laterally in alternation until the link is completely bent, or this process is carried out by means of special lateral bending blades. It will be done.

This known arrangement, however, results in an excessive load on the bending mandrel, which is weakened by a significantly narrower cross section due to the cutting of grooves to accommodate the preceding already bent chain links. It's a disadvantage.

This is because the back of the pin, which is formed by the central region of the pin, is relatively short and therefore the force required to deform the back in the corresponding forming groove of the mandrel further reduces the cross-section to form this forming groove. This is because the single phase core must be large.

Therefore, even if an expensive material is selected for the mandrel, the mandrel easily breaks.

The object of the invention is to avoid this drawback.

This object is achieved according to the invention as follows.

two back bending blades are provided which are advanceable towards the end of the pin opposite to the locking movement of the holding member and which are actuatable by the motion device; This problem is solved by configuring so that only the warp of the string can be slid in the direction of the mandrel.

The mandrel is no longer loaded by the bending deformation of the back of the chain link, and the stress on the holding member is significantly reduced.

This is because the bending is carried out entirely over the entire length of the pin via the back bending blade according to the invention.

There is therefore no longer any risk of damage to the mandrel, and the holding member is correspondingly simple in its construction and in its means of movement.

As mentioned above, in this case the holding member first acts as a reaction force for the pin when the back bend is performed;
After this backbend has been formed, the holding member is then slid towards the mandrel by the bow of the string of this backbend, forcing the bent pin into the appropriate forming groove of the mandrel where it is inserted into the next bending step. It works to hold the pin in place.

The invention is simplified in that the back bending blade is rigidly integrated with the bending blade and is actuated by a common forced motion device, with the back bending blade being on the mandrel side of the pin in the starting position and the bending blade being on the mandrel side of the pin. Must stand on the opposite side of the mandrel.

Both sections are therefore first guided together from the mandrel side in the direction of the pin, the back bending is carried out, and then the holding member presses the pre-bent pin in the direction of the mandrel and is then moved in the opposite direction. , a bending blade makes the bend of the pin U-shaped.

This provides that a common bending blade holding device is provided for the bending blade as well as the back bending blade according to the invention, with these blade holding devices comprising two jaws parallel to the plane of the link. , these jaws accommodate the feeding bush in the case of one blade holding device and the stop for the pin in the case of the other blade holding device, and both accommodate the end of the pin between them.

In this case, the jaw carries at its end a bending mechanism, for example in particular a bending roll.

The back bending blade, on the other hand, projects from the base between the jaws towards the end of the pin.

Furthermore, in this case, in the window-like notch formed in either one of both jaws of each bending blade holding device,
Optionally, the back bending blade can be inserted in each case into the bending blade holding shank itself and the clamping can be held, for example, by a cover.

The present invention will now be described in detail with reference to the accompanying drawings of embodiments.

The pin 5 is pushed by the feed bush 6 in front of the mandrel 7, which is in turn connected to the leading chain link 9.
a groove 8 for accommodating a pre-bent pin, as well as a groove 10 running transversely to said groove 8 for accommodating a pre-bent pin, approximately corresponding to the contour of the finished bend of the pin. .

The pin is held loosely on the mandrel by a holding member 11 in the extended position.

According to the invention, two special bending blade holding devices 12 are provided which end at their free ends in two jaws 13 in each case.

As shown in FIG. 2, this jaw includes on the one hand a supply bush 6 and on the other hand a stop pin 15, a pin not shown in FIG. This bending roll is located on the opposite side of the pin 5 from the mandrel.

The bending blade holding device 12 is provided with a window-like cutout into which the back bending blade 17 according to the invention can be inserted.

This back bending blade has a projection 18 which projects from a base 19 between the jaws towards the end of the pin on the mandrel side.

This blade is shown by a dashed line and has an elastic cover 2.
0 and is supported by the lower surface 21 on the corresponding frame surface of the window-like notch 16.

The exercise device is not shown in the figures since it is known per se.

The movement process is clear from the above description.

In the starting position shown in FIG. 1, the pin 5 is pushed out of the feed bush 6 towards the stopper pin, and the bending blade holding device 12 is moved in the direction of the arrow 22, so that the pin is shown in dashed lines. It is curved into a shape 23.

Subsequently, the bending blade holding device 12 is retracted in the direction of the arrow 24.

The holding member 11 is moved in the direction according to the arrow 25 until the pre-bent pin 23 abuts the corresponding bend of the mandrel.

The bending blade retainer 12 continues its movement in the direction of the arrow 24, bending the pin 23 into a U-shape 26 shown in dashed lines.

The links shown in solid lines are then alternately moved to one side and the other by the blade retention device moving laterally or by the blade retention device being retracted and the extra lateral bending blade being advanced. It is completely bent into the shape of.

This process is known per se.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a substantial part of the device according to the invention, and FIG. 2 is a front view. 11... Holding member, 17... Back bending blade.

Claims (1)

[Claims] 1. A bending mandrel that corresponds to the internal shape of the chain link, is provided with a longitudinal groove for accommodating the preceding chain link, and has a fixed position, a bending process that can be slid along the mandrel in the tangential direction. a supply bushing for the pin to be processed, a holding member for pressing the pin against this mandrel in the center of the mandrel, and two bending blades movable tangentially to the mandrel and gripping the pin ends; In this chain bending machine, the holding member and the bending blade are forcibly actuated via a movement device, in which the holding member 1
two back bending blades 17 are provided which are advanceable towards the pin end opposite the fixing movement of one and actuable by a movement device, and the holding member 11 is provided with a back bending blade formed of the pin. A chain bending machine characterized in that only the warp of the string can be slid in the direction of the mandrel.