DE7033145U - CONTROLLED FEED COLLET - Google Patents

Description

Dr- - Ing.Herbert Moser Patent attorney G. Kieeelbronn

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Controllable feed tongs

The invention relates to a controllable feed tong with a rotary drive, in particular for eccentric presses, in which a The upper part of the pliers under the action of a spring is pressed against the lower part of the pliers in the closed position, the movement of the upper part of the pliers being based on an eccentric drive.

To control the feed of wire and tape-shaped Material are known for szenterpressen feed devices, which have a fixed retaining tongue and one in one Have slide guide displaceable Bringer pliers. These pliers are driven by a corresponding control drive open and closed in phase opposition, which results in a section-wise feed of material. With the known Embodiments is the opposite of the pliers lower part The upper part of the pliers, which can be moved in parallel, is mounted against pressure celebrations, and the opening is carried out with the aid of an eccentric drive against spring force. In this version, however, the spring force is smallest in the closed position, although in this position the greatest possible spring force would be required to hold on. To reach the open position, however, must the optimal spring force can be overcome. Such a one

Indicators 1 Pliers lower part 2 Upper part of the pliers 3 Plunger 4th One-armed control lever 5 Slot recess 6th nolle 7th Squat part 8th Recess 9 Subscription rate 10 Slidable counter position 11th Eretee spring element 12th Fixed counter bearing 13th Screw thread guide 14th Second spring element

Execution proves to be particularly unfavorable if a high number of opening and closing operations in i | the time unit should be achieved. For this purpose, in order to prevent the feed material from slipping, an increase in the spring force must take place, which, however, because of the spring force described, which is directed in the opposite direction to the kinematic claims, results in a considerable constructive force Difficulties arise as to the speed of the drive · and thus the number of opening and closing processes limit per time unit.

The invention is based on the task of creating a controllable feed tong with a rotary drive, in particular for eccentric presses, which reduces the temporal course of the spring force, which is unfavorable from the task at hand largely avoids and enables a high number of opening and closing cycles per unit of time in a simple structural design. The characteristic of Invention can be seen in the fact that the upper part of the pliers with a first spring element acting in the closing direction and is connected to a second spring element acting in the opening direction, that the first spring element has a limiting stop which acts on a spring Part of the movement path of the upper part of the pliers is limited in the area of the closing end position, and that the spring force of the first The spring element is greater than the spring force of the oppositely acting second spring element. Such a training in which the spring force of the first spring element « is generally much greater than the spring force of the second spring element, which is only used to produce the opening position, has the fundamental advantage

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that the high spring force is only available in the area of the closing end position, i.e. where it is needed to hold the material in place will occur. The feed tongs can therefore be operated at high speeds and thus achieve a correspondingly high number of opening and closing cycles.

A further advantage can possibly be achieved thereby that to drive the upper part of the pliers at least one from the eccentric controllable plunger is provided, which has a shoulder of smaller cross-section, on the to limit the stop, a counter bearing of the first spring element is displaceable, while another, fixed The counter-bearing is located in the region of the free end, and that the second spring element is supported in a stationary manner on the lower part of the pliers and movably on the upper part of the pliers. This construction * enables a simple and effective limit stop for the spring action of the stronger first spring element. The first and second Federeleaect are useful as Scoraub compression springs formed.

An advantageous drive can optionally be achieved in that the plunger is articulated to a one-armed control lever which has a sensing element for the rotatable cam part of the eccentric drive. There are however, other known ram drives can also be used.

To carry out the known parallel displacement of the upper part of the pliers with respect to the lower part of the pliers, it is useful two symmetrically arranged plungers with a first and a second spring element in the area of the pliers

end to be seen. It also appears if applicable advantageous, the fixed 'counter-bearing of the first spring element in the area of the StöBalsu_es adjustable.

When the features of the invention are used, a controllable feed tong results in which the one to be fed Material is held in the closing end position with high spring force, while this spring force is used to produce the opening position is ineffective, the bringing about of the opening division τοη a much weaker spring element goes out.

In the drawing is part of a feed tong according to FIG Invention shown schematically. A similar training can generally also be found on the other, in the Drawing not shown end of the feed tongs.

One recognizes a tong lower part 1, against which a tong upper part 2 can be moved in parallel. The drive of the top tong parts 2 gtHT from τοη a plunger 5, which is • angeltnkt to inta-armed control lever 4 in an elongate recess. The control lever 4 carries as a scanning element • int roller 6, which rests against a cam part 7 connected to the rotary drive.

The plunger passes through a recess 8 in the area of one end of the upper part 2 of the pliers and can be displaced therein.

The plunger J also has a shoulder 9 with less

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Cross-section, which as F-Ti * -αη £ for a sliding Counter bearing 10 of a first fader element a 11 is used. A fixed counter bearing 12 is in the area of the free end of the ram provided and for setting the Feäerspamumg adjustable in a screw thread guide 13.

A second spring element 14 is supported on one side on the lower part of the tongs 1 and on the underside of the movable upper part 2 of the pliers.

The mode of operation of the device can be seen from the illustration. If the one-armed control lever 4 moves to below, when the upper part 2 of the pliers is placed on the material, the counter-bearing 10 counteracts the force of the force first spring element 11 moved and the pressing force to hold the material thus from the first stronger Spring element 11 exercised. When lifting off, the first spring element 11 relaxes up to the limit stop, and the opening movement is controlled by the second weaker spring element14 brought about.

70331A5-3.1Z70

Claims (1)

- 6 claims 1. Controllable feed tongs with rotary drive, especially for eccentric presses where a spring action standing pliers upper part is pressed in the closed position against the pliers lower part, the movement the upper part of the pliers is based on an eccentric drive, characterized in that the Upper part (2) of the pliers is connected to a first spring element (11) acting in the closing direction and to a second spring element (14) acting in the opening direction is that the first spring element (11) has a limit stop (10), velcher the spring effect part of the path of movement of the upper part of the pliers (2) is limited in the area of the closed end position, and that the The spring force of the first spring element (11) is greater as the spring force of the oppositely acting second Federal element (14). 2. Feed tongs according to claim 1, characterized in that that at least one of the eccentric drives (4,5, 6.7) controllable plunger (3) is provided, which has a shoulder (9) of smaller cross-section a counter bearing (10) of the first spring element (11) can be displaced to limit the stop, while there is another, fixed counter-bearing (12) in the region of the free end, and that the second spring element (14) is supported in a stationary manner on the lower part of the tongs (1) and movably on the upper part of the tong (2). -7- 5. Feed tongs according to claim 2, characterized in that the plunger (5) au iiüöi one-armed control lever (4) is articulated, which has a sensing element kS) for the rotatable lock part (7) of the eccentric drive. 4. Feed tongs according to claim 2, characterized in that. dsJB dsr pliers head part (2) by two tappets (5) arranged symmetrically in the area of the tong ends and provided with a first and a second spring element (11, 14). 5. Vorsohubzange according to claim 2, A * α urch characterized in that the fixed counter bearing (12) of the first spring element (11) is adjustable in the region of the ram end. -8th-