FI66304B - ANORDNING VID SPIKMASKINER - Google Patents

Description

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Sweden-Sverige (SE) 7907616-2 (71) Rabbalshede Pall AB, Box 206, S-l + 50 73 Rabbalshede, Sweden i-Sverige (SE) (72) Sigfrid Marenius Olofsson, Munkedal, Sweden-Sverige (SE) ) (7 ^) Le i tz Inger Oy (51+) The present invention relates to an apparatus for nailing machines equipped with a nail storage and outgoing connecting pipes 11a for conveying a nail to one or more nailing hammers formed by a pneumatic piston cylinder, the cylinder communicates with the compressed air source via a pressure valve n and the piston of which is connected to at least one injection spindle movable back and forth on a nailing hammer to which at least one connecting pipe from the nail storage is connected.

In a previously known nailing machine, the nailing hammer includes an eccentric which, via a punching spindle, mechanically forces the nail into the workpiece. In another known nailing machine, the nail is pressed by means of a hydraulic piston cylinder. In either case, a relatively robust frame structure is required for the nailing machine, which requires a lot of space. The same also applies to previously known nailing machines which operate pneumatically with a nailing hammer.

According to the present invention, there is provided a nailing machine which operates with high force in a very fast and efficient manner, while the structure of the 266304 can be made relatively small and mounted on a less solid structural frame. The features of the nailing machine according to the invention will become apparent from the claim below.

In the following, the device according to the invention will be explained in more detail with reference to the accompanying drawings, in which:

Figure 1 shows a front view of a nailing machine.

Figures 2 and 3 show a vertical section of a nailing machine according to the invention in different spaces.

Figure 4 shows a vertical section of the top of the nailing hammer shown in Figures 2 and 3 inverted by a quarter turn.

Figures 5 and 6 show a detachable part of a nailing hammer seen from above and from the side, respectively.

Fig. 7 shows a vertical section of a nailing hammer according to another embodiment.

The nailing machine according to Fig. 1 is formed by three nailing hammers suspended on a cross member 2, which cross member can be raised and lowered by means of a piston cylinder 3 and connected to side guides 4 running in the frame member 5. The nail warehouse 6 is a structure known per se. , which lead down to the lower part of the nailing hammer I.

According to the invention, the nailing hammer is constructed in the following manner, with reference to Fig. 2. It is formed by a pneumatic piston cylinder 8, the cylinder 9 of which communicates with a source of compressed air via a pressure valve 10 rigidly connected to the control valve II. The piston 12 of the piston cylinder 8 is connected to an insertion spindle 13 which can be moved back and forth by means of a piston through the end 14 of a nailing hammer. A connecting pipe 7 from the nail storage 6 is connected to this.

The head 14 is assembled from two parts, a part 15 fixedly fitted to the nailing hammer and a part 16 detachable from this fixed part.

66304

The detachable part 16 is illustrated in Figures 5 and 6. It has the shape of an elongate U and is fitted with a lever arm 17 actuated by a spring 18. The part 16 can be clamped to the part 15 by means of a handle 19 and a clamping arm 20 around sleek 21.

The fixed part 15 of the head 14 has a concavely curved wall 22 which, when fed into the cavity 24 between the parts 15 and 16, forms a abutment surface for the front end of the nail. Due to its curvature, the wall 22 will guide the nail 23 in solid lines to the position shown in Figure 2. The nail 23 then rests against the lower end of the lever arm 17, which forms a tongue 25 which rests resiliently against the nail and prevents it from falling off the end 14.

In the embodiment shown in Figures 2-4, the piston cylinder 8 has a side channel 26 for compressed air. This channel has an inlet 27 on the pressure side of the valve 10 and an outlet 28 below the piston 12. The sealing ring 29 ensures that the air pressure from below only has the possibility of influencing a small part of the extent of the piston 12.

Nailing is done as follows. The nail is fed down through the connecting pipe 7 to the end 14 and down to the position described above, as shown in Fig. 2 by the intact lines where the nail is fastened.

The control valve 11 provides a control signal so that compressed air is connected to this valve, which then closes the air outlet from the cylinder 9. Due to the rigid connection with the pressure valve 10, this opens simultaneously. The compressed air immediately acts at full power and strikes the piston 12 and stem 13 down in a fraction of a second, and the nail therefore becomes forced into the workpiece 30 at lightning speed (shown in Fig. 1).

As can be seen from Figure 3, the mandrel 13 forces the tongue 25 of the lever arm 17 somewhat against the action of the spring 18. During the return movement of the mandrel 13, the lever arm 17 springs back to the position shown in Fig. 2 and is again ready to engage the nail 23.

When the piston 12 has reached the lower position, there is still a full overpressure in the cylinder 9. In this state, the control valve 11 is released from the mark pressure. Now the overpressure in the cylinder 9 causes the valve 6 6 6 3 0 4 to open the air outlet. This simultaneously causes the valve 10 to close the inlet to the cylinder 9, see Figure 3. The pressure in the cylinder 9 then decreases while full overpressure prevails below the piston 12, depending on the connection through the side channel 26, which means that the piston rises again to its initial position in Figure 2 and then ready for the next work stroke.

If the nail 23 wedges on the head 14 due to damage or for any other reason during the working stroke, it is not necessary to stop the nailing hammer for a longer time, as is often the case in previously known structures, due to great difficulties in separating the nail from the mechanism. According to the invention: it is only necessary to fold down the clamping arm 20, as shown in Fig. 6, which does not face any major obstacle due to the presence of the flexible rubber sleeve 21 and the separate parts 15 and 16, whereby the defective nail falls off and then re-installed just as easily and quickly parts together.

Fig. 7 shows an embodiment with a double end 31. In this case, the piston 12 is provided with two push-in spindles 13 and a double end 31 with two detachable parts 16.

In this case, the side channel 26 is replaced centrally by a tube 32 passing through the cylinder 9, through which the overpressure is caused down to the lower side part of the piston 12.

The operation of this nailing hammer is similar to the operation of the embodiment described above. A nailing hammer with a double head, selected as an application example for the nailing machine shown in Fig. 1, gives the nailing machine a high power. So it becomes possible to hit six pounds in an instant.

The invention is not limited to the embodiments shown and described in the drawings, but many modifications are possible within the scope of the following claims. Thus, for example, it is also possible to construct the machine so that it has three or four punching spindles 13 in each nailing hammer. Thus, the nailing machine shown in Figure 1 can be constructed with difficulty to strike twelve pounds per stroke.

5 66304

It is also possible to provide a connection between the head parts 15 and 16 by means other than the handle 19 and the clamping arm 20.

Claims (1)

A device in nailing machines provided with a nail storage (6) and connecting pipes (7) therefrom for conveying a nail (23) to one or more nailing hammers (1) formed by a pneumatic piston cylinder (8), the cylinder (9) of which is connected to a pressure with an air source via a pressure valve (10) and whose piston (12) is connected to at least one spindle (13) movable back and forth on a nailing hammer (14, 31) to which at least one connecting jar (7) from the nail storage (6) is connected, characterized in that the pressure valve (10) is connected to a control valve (11) adapted to shut off the air outlet from the cylinder (9) and at the same time open the pressure valve (10) and allow compressed air to act against the top of the piston (12) with the ceasing sea pressure by means of the overpressure still prevailing in the cylinder (9) again open the air outlet and at the same time cause the pressure valve (10) to close the inlet to the cylinder (9) and that a seal (29) is arranged under the piston (12) below the piston (12) from the outside air to close the space through the duct connected to the compressed air source (26) , 32), through which compressed air enters said space and acts on a sub-area of the piston (12) to return the piston (12) with its stems (13) to its initial position.