DE1652032B1 - Device for grinding by means of an endless grinding belt - Google Patents

Description

1 2

The invention relates to a device bear beams, however, at its upper end each

for grinding by means of an endless grinding belt, have a stop assigned to the carrier,

which is guided over two intervertebral discs and of An advantageous design provides that the one

a pressure-perpendicular lever arm over the entire working width with the help of a spring against one

bar is pressed onto the workpiece, with the 5 stop being pulled.

Workpiece rests on a conveyor belt which, according to a further proposal of the invention half of the pressure beam over two rotatable rollers, the tie rods are guided with the interposition of which is supported on the two arms of a rocker springs on the support frame,
are stored, the tilt axis in the symmetry- In the device according to the invention the pressure beam falls, and all the disadvantages mentioned to control io avoided, the lifting and lowering of the pressure beam cause combinations that only at the points when the workpiece enters one on a bolt on which the buttons, z. B. feeler rollers, lifted pivoting piece with a lever, the grinding pressure can be seen acting on the workpiece. can. In addition to the longitudinal edge of the workpiece can

With these belt grinders, the pressure does not occur, so that the edges do not

bars arranged elastically, so that an alignment can be rounded or sanded through. A grind is

to the workpiece to be ground is guaranteed. thus possible at any point and also in two lanes.

To protect the longitudinal edges of the workpieces The front and rear workpiece edges are

however, these elastic pressure beams must be protected by known devices such as these

be hung up speaking the workpiece width, 20 z. B. in the German patent specification 1167 686

so that the elastic pressure bar is not around the are written.

The device according to the invention is simple, or the relatively thin veneer is sanded through. This is reliable and economical.
Adjustment must be carried out by hand. Further features of the invention emerge from and are to be adapted to each workpiece width, which is very disadvantageous in the following description of exemplary embodiments. Furthermore, the workpiece must always run through the machine in conjunction with the drawings and at the same point, so that claims. It shows, in schematic sketches,
it is not possible to enter the machine. F i g. 1 tore the device according to the invention in the accruing workpieces without prior alignment and

ribbons. Furthermore, it is also not possible to use two 30 Fig. 2 another embodiment of the

Grinding workpieces side by side at the same time. direction in elevation.

There are also pressure beam machines known, In F i g. 1 shows a device in which which enables the lateral setting via a large number of a stationary support frame 1 on both sides pivoting Compressed air control valves and compressed air cylinders pieces 2, 2 'by means of bolts 3, 3' are mounted. To the actuate. Such a device is very open- 35 pivoting pieces 2, 2 'are vertical lever arms 4, 4' agile, expensive and prone to failure. To protect the and horizontal lever arms 5, 5 'as well as with the front one and the rear edge of the workpiece, the running direction 6 of the workpiece 7 forms an acute angle Pressure bar arranged after passing through the front work-forming lever arms 8, 8 '. On the lever piece edge automatically placed on the workpiece poor 8, 8 ', guide rollers 9, 9' are provided, and again automatically lifted off early so that 4 ° The lever arms 4, 4 'are by a rod 10, the the rear edge is not sanded through either. are articulated to this by joints, with each other

There is also a device for controlling the connected. The rod 10 also causes

Allocation and removal of the sanding pad to wide-actuation of only one lever arm of the opposite one

belt grinders known, in which the movement of the lever arm is moved with, whereby a scanning

of the sanding shoe takes place via a timer which is maintained until the workpiece 7 is left

remains of an actuator in the form of a lever. The lever arms 5, S 'are supported by a U

is controlled. The actual movement of the loop-shaped carrier 11 is articulated to one another,

The system, consisting of the swivel pieces 2, 2 '

factory-triggered impulses, so that the mode of action with the corresponding lever arms and the U-conveying

this device on an electro-mechanical basis 50 shaped support 11 and the rod 10 is through

is based. In contrast, a spring 13 according to the invention works pulled against a stop 14.

Device on a purely mechanical basis and can The horizontal transverse part 12 of the carrier 11 has

on a number of electrical control devices and the like. Two holes through the tie rods 15, 15 '

dispense with it and will therefore go through it in a much less disruptive manner. The tie rods 15, 15 '

subsceptible. 55 are equipped with rollers 16, 16 'at their lower end

The present invention is intended to provide these disadvantages and to combine them by means of an intermediate piece 17.

Avoid by connecting one another on both sides of the pressure beam. The intermediate piece 17 is through

two pivot pieces on a stationary support frame an elastic element 18, which is located on the support frame 1

are articulated and by being supported on the swivel pieces, pressed down, and so far until

three lever arms are attached, the ends of the 60 connecting rods 15, 15 'with the stops 19, 19'

vertical lever arms by means of a rod and which are located on the horizontal transverse part 12 of the carrier 11

Support the ends of the horizontal lever arms by means of a. Runs in below the rollers 16, 16 '

U-shaped support articulated together printing belt 20, ζ. B. made of steel, under which the

are, whereas at the ends of the further lever arms borrowed grinding belt 21 is arranged. The leadership

Guide rollers are rotatably mounted, and by the 65 rollers 9, 9 'are set in the rest position so

horizontal transverse part of the carrier two holes that they opposite the grinding belt 21, in Fig. 1

has, by the tie rods slidably drawn in dashed lines, stand lower,

go through, which at its lower end the pressure The workpiece 7 runs in the direction of the arrow in the inven-

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a proper device, wherein the intermediate piece 17 with the rollers 16, 16 'and the steel belt 20 and the grinding belt 21 a small distance to the top edge of the workpiece. As soon as the front edge of the workpiece 7 is the left side of the Reached grinding belt 21, the workpiece 7 is in a known manner by a contact rocker 22 against the grinding belt 21 pressed. The contact rocker 22 is pivotable about the axis 23, whereby the conveyor belt is guided over two rotatable rollers 24, 25 which are mounted on the two arms of the rocker 22. As soon as the workpiece 7 is lifted into the grinding position with the aid of the contact rocker 22 or the pressure bar is placed on the workpiece from above, the guide roller 9 'is at the same time from the dashed Position raised to the extended position, which causes the same time over the Lever arms 8 ', 4', rod 10, the lever arms 4, 8 and the guide roller 9 are operated in the same way, which causes the horizontal transverse part 12 of the carrier 11 by the movement of the lever arms 5 and 5 'sinks, as a result of which the elastic element 18, which is designed, for example, as a hose, acts Via the intermediate piece 17, the rollers 16 and 16 ', the steel belt 20 onto the grinding belt 21, the Stops 19, 19 'no longer touch the transverse part 12 of the carrier 11. This means that during the Grinding process, the tie rods 15, 15 ', the intermediate piece 17 and the rollers 16, 16' mounted elastically and adjust to the workpiece 7.

When the guide rollers 9, 9 'are not actuated, the device is in the dashed line Position, the horizontal transverse part 12 of the carrier 11 being supported by the spring 13 and the stop 14 is brought into the raised position, so that the grinding pressure is added via the stops 19, 19 ' and is not sanded at these points. As soon as the workpiece 7 reaches the right edge of the Reached grinding belt 21, the pressure is reduced by the known contact rocker 22, whereby the rear edge of the workpiece 7 is protected.

F i g. FIG. 2 shows another exemplary embodiment of the device according to the invention, in which, as in FIG. 1 Swivel pieces 2.2 'with lever arms 4.4', 5.5 ', 8, 8' are mounted on both sides in a stationary support frame 1. On the tie rods 15, 15 'are the rollers 16, 16 ', the tie rods in turn being connected to one another by an intermediate piece 17. Between the horizontal transverse part 12 of the U-shaped support 11 and the intermediate piece 17 is a elastic element 18, preferably a Preßl hose, arranged, which when lifting the F approximately rollers 9, 9 'from which to move down the horizontal transverse part 12 of the carrier 11 together amount is pressed, whereby the force of the springs is overcome, so that the pressure on the Z between piece 17, the rollers 16, 16 ', the grinding belt and finally on the workpiece 7 acts.

Claims (3)

Patent claims: 1. A device for sanding by means of an egg-free sanding belt, which is guided over two belt wedges and is printed on the Werksri by a pressure bar that extends across the entire Arbe, the workpiece resting on a conveyor belt that runs over two rotatable rollers below the pressure bar guided which are gelas on the two arms of a rocker, whose tilt axis falls in the plane of symmetry 1 pressure beam, and where for controlling 1 raising and lowering of the pressure beam when the workpiece enters, a swivel piece mounted on a bob with a lever ν is seen, characterized in that on both sides of the pressure beam z ¹ pivoting pieces (2,2 ') are articulated on a stationary door frame (1) and that three lever arms (4,4' 5 ', 8,8') on c pivoting pieces (2, 2 ') are attached, the ends of the 1 right lever arms (4,4 ') by means of a Stai (10) and the ends of the horizontal lever arm (5.5 ') by means of a U-shaped support (11) are hingedly connected to one another, whereas the ends of the further lever arms (8,8 ') Fi approximately rollers (9, 9 ') are rotatably mounted, and c the horizontal transverse part (12) of the carrier (: has two bores through which the Zugstanj (15, 15 ') slidably pass their lower end carry the pressure beam, their upper end · on the other hand, each carry one to the Trä (11) have associated stop (14). 2. Apparatus according to claim 1, characterized in that the one vertical lever (4 ') is pulled with the aid of a spring (13) against a / impact (14). 3. Apparatus according to claim 1 or 2, 1 characterized in that the tie rods ( 15 ') are supported with the interposition of springs (26) supporting frame (1). 1 sheet of COPY drawings