JPS62126909A - Automatic mowing head for mower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an automatic mowing blade P for a grass mower using an elastic wire or wire as a cutting tool, comprising:
The cutting tool is of the type in which a wire cutter projects radially from the mowing head and is wound around a storage coil rotatably arranged inside the casing of the mowing head.

BACKGROUND OF THE INVENTION In mowing heads of this type, the wire cutters are preferably made of plastic.

The mowing and reheading is usually driven via a motor shaft which, as is known, is mounted in a tubular component which serves as a support and protection device.

As is known, the motor shaft is driven at a high rotational speed via an internal combustion engine or an electric motor.

Mowing heads with such radially projecting wire-shaped cutters are known from the prior art. Such a mowing head consists of two primarily shell-shaped components, the image component receiving a rotatably mounted coil in its interior. A stock of a wire cutter is wound around this coil or storage coil. In this case, the wire-shaped cutter is preferably wound on the storage coil in such a way that its ends, which serve as cutters, protrude radially from the mowing head.

When the wire-shaped cutter used as a cutting tool and often made of plastic material wears out, in known mowing heads of the above type it is necessary to stop the drive motor and interrupt the rotary movement of the mowing head. The tensioning screw arranged in the lower part of the mowing head is then loosened and the two casing halves forming the mowing head are pulled apart from each other. This unlocks the storage coil, which is then rotated by the mowing head also pulling on the exposed thread end. As a result, a wire-shaped cutter of the required length is pulled out of the mowing head in the radial direction for the subsequent mowing operation.

Normally wire rod type cutters cut grass from 1 to about 10 to 20 + 1.
It stands out. After the wire-shaped cutter of the desired length has been pulled out, it is necessary to put the two housing halves together again and tighten them again using screws. As mentioned above, in the known mowers or mowers, the work of the mower must be interrupted by stopping the mower, and moreover, in order to pull out the wire-shaped cutter of the desired length from the casing, a cumbersome operation at the mowing head is required. Mechanical operation is required. The manipulation of tensioning devices that have to be loosened is often not easy (for example, the use of auxiliary devices such as special tools is unavoidable).

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a wire-shaped cutter of the desired length which can be used in known mowing machines without requiring any complicated mechanical manipulations and which also requires a drive motor and a mowing head. SUMMARY OF THE INVENTION It is an object of the present invention to provide a new mowing head which can be run automatically from inside the mowing head without interrupting the rotary movement. The arrangement is such that a shaft projects from the underside of the mowing head, the shaft having a support and sliding disc at its free end, and further comprising:
The end of the shaft that protrudes into the mowing head is configured as a protrusion. the stop is rigidly connected to the storage coil receiving the wire-shaped cutter, the supporting and sliding disc, the shaft and the transverse pin together being connected to the spring. The spring is movable axially against the action and is supported inside the mowing head on a transverse pin and on a limiting wall of the upper casing part of the mowing head.

Embodiment In an advantageous embodiment of the invention, a braking device is assigned to the shiftable device for locking or unlocking the wire-shaped cutter, that is to say the supporting and sliding disc, the shaft and the guide sleeve, the braking device being It consists of a lower disc and an upper disc which is non-rotatably operatively connected to the storage coil, between which a longitudinally shiftable transverse pin is arranged. Stops configured as projections are arranged alternately on opposite sides of the disc, with which the transverse pins are operatively connected, so that the wire shape can be adjusted in each longitudinal direction of the shaft relative to the mowing head. Rotational movement in the cutter running direction is restricted. With this structure, when the pressing force is transmitted to the support/sliding disc, only the wire cutter of a predetermined length can always run out, and the wire cutter that is too long runs out from the mowing head. This can definitely be avoided.

Example The invention will now be described in detail with reference to the drawings.

As can be seen in FIG. 1, a mowing arm 1'1 of a mower, not shown, is operatively connected to a motor 11112. This motor shaft 2 moves the mowing head 1 to 130 mm.
It is rotated at a rotation speed of Q Q rpm.

The mowing head 1 mainly consists of two shell-shaped components 3.
．． 4, the image component 3.4 is preferably made of aluminum, plastic or a similar material. The shell-shaped image components 3 and 4 are connected to each other via screws.

From the mowing head 1, a wire-shaped cutter 6 projects from the housing in the radial direction beyond the sliding sleeve 5. This wire-shaped cutter 6 is preferably made of strong elastic plastic and projects radially from the housing. The wire-shaped cutter 6 is wound around a replaceable storage coil 7, which is arranged inside the mowing head l.

A supporting/sliding disk 8 protrudes from the underside of the mowing head 1. This supporting and sliding disk 8 is rotatably received via a ball bearing 9 by a shaft 10, which extends into the interior of the mowing head 1.

As best seen in FIG. 2, the shaft 10 extends into the interior of the mowing head 1, where it is received by an id sleeve 11, although it is of tubular construction.

The end of the shaft 10, which projects into the interior of the mowing head 1, has a transverse pin 12 which is rigidly connected to the shaft 10. This transverse pin 12 is mounted on a friction disk 13 which is mounted on the storage coil 7 of the wire-shaped coil 6 . The lower component Φ of the mowing head 1 has a central bulge 14 which has a circular shape and serves as a bearing pin for the storage coil 7 and also serves as a support pin for the storage coil 7. 7 acts as a guide for the storage coil 7 during the rotational movement when the wire cutter 6 is fed out.

Furthermore, the storage coil 7 has a stop 15 which is integrally formed on the coil 7 as a projection.

These stops 15 are offset radially outwards and form stops to which the ends of the transverse pins 12 are operatively connected. A disk 16 is mounted on the lateral pin 12. One end of a spring 17, preferably a coil spring, is supported on this disk 16. The other end of the spring 17 is supported on the inner wall of the upper casing part 18 of the mowing head 1, which is connected to the motor shaft 2, which is a drive shaft.

During assembly of the mowing head 1 , the spring 17 is prestressed in such a way that a constant spring force is transmitted via the disc 16 to the transverse pin 12 and thus to the friction disc 13 . This ensures that the transverse pin 12 is held between the protruding stops 15 of the storage coil 7 during operation of the mowing head 1, thereby avoiding undesired rotational movements of the storage coil 7 and running-out of the wire-shaped cutter. .

In order to enable the transverse pin 12 to carry out a movement in the direction of the arrow f, the guide sleeve 11 has window-like recesses 19, by means of which the transverse pin 12 can be moved against the spring 17. allows unhindered longitudinal movement against the forces of

The working mode of the mowing head 1 described above is as follows: As soon as the mowing head l is rotated via the motor shaft 2, the wire-shaped cutter 6 extends radially due to centrifugal force and cuts the cutting tool. Form.

Since the wire-shaped cutter 6 is usually made of elastic plastic, it will wear out over time, leaving only a short section that protrudes somewhat from the mowing spatula 1'1, as shown in FIGS. 2 and 3. left behind. In this case, the wire cutter 6 can no longer function as a cutting tool. In this case, therefore, the stored wire-shaped cutter 6, which is wound on the storage coil 7, must be withdrawn (.

According to the invention, this operation can be carried out completely automatically, without having to interrupt the rotational movement of the mowing head 1. In this case, it is only necessary to apply pressure via the motor shaft 2 to the supporting and sliding disk 8 in contact with the ground in the direction of the arrow g. Due to the ball bearing 9 provided between the supporting and sliding disk 8 and the shaft 10, the supporting and sliding disk 8 cannot be rotated. When the pressing force applied in the direction of the arrow g exceeds the force of the spring 17, the nyafu) 10 is pushed into the interior of the mowing head 1, and the transverse pin 12 is also provided with a window-like cutout 19. Based on this, it is freed from rotational movement. This brings the ends of the transverse pin 120 out of operative connection with the projection 15, so that the storage coil 7, due to centrifugal force, pulls the projection 14 projecting out of the lower component 4 of the casing. You can perform slow rotational movements around the center.

In order to prevent the storage coil 7 from performing too fast a rotational movement and causing an undesirably long wire-shaped cutter 6 to run out, a friction disk 13 is preferably provided which acts as a brake. This friction disk 13 is made of friction material and serves as a brake for the storage coil 7 made of plastic. If a wire cutter 6 of sufficient length runs out (this can be clearly seen by observing the shadow of the wire cutter 6 when the mowing head 1 rotates), it is added in the direction of arrow g. It is sufficient to remove the pressure again. This acts on the spring 17 and returns the transverse pin 12 to the position shown in FIG. 2 again. In this position, the storing coil 70 is
The rotary movement is again interrupted.

In the second embodiment shown in FIGS. 4 to 8, the braking device consists of a lower disc 2o and an upper disc 21, the two discs 20.21 being arranged opposite each other. and is arranged coaxially with respect to the shaft 10.

The disc 20.21 delimits the area in which the transverse pin 12 is arranged. Furthermore, the disk 20.21 is connected in a rotationally fixed manner to the storage coil 7.

In detail, the lower disc 20 has openings 22 arranged in the diametrical direction, and stoppers 23 are inserted into these openings 22, and the stone ♀ 23 is inserted in the axial direction from the upper side of the storage coil 7. The protruding lower disk 20 is non-rotatably connected to the storage coil 7.
Ru.

A pin 24 projects from the side collar of the lower disc 20 facing the upper disc 21, and the pin 24 is inserted with its free end into a hole 26 in the upper disc 21, so that both Disk 2
0.21 are to be coupled together.

On opposite sides of both disks 20.21, stops are provided, designated 30, 31. As shown in FIG. 8, the stopper of one of the discs is offset from the stopper of the other disc by χ↑.

The stoppers 30 and 31 are vertical stones on two sides 30, respectively.
a and 31a, and these two stone surfaces transition into inclined surfaces indicated by reference numerals 30b and 31b, respectively.

Under normal conditions, i.e., when no pressure is applied to the supporting and sliding disk 8 to shift the shaft 10, the transverse pins 12 are located diametrically opposite the lower disk 20. The stopper surface 30a of the stopper 30 is in contact with the stopper surface 30a.

As soon as pressure is applied to the supporting and sliding disc 2o and the shaft is shifted against the force of the spring 17, the transverse pin 12 is released from the corresponding sliding stop 30 of the lower disc 20 and this As a result, the storage coil 7 is rotated at a temperature of .degree. C. based on the centrifugal force, and the lower disk 20 is also carried along. This operation is performed when the lateral pin hits the stopper 31 of the upper disc 21.
? This continues until abutment against surface 31a prevents further rotational movement of storage coil 7.

When the supporting and sliding disk 8 is again unloaded, the transverse pin 12 moves towards the lower disk 20 and, after a slight rotational movement, abuts against the stop surface 30a of the stop 3o.

This allows storage coil 7 to perform a rotational movement corresponding to the angular deviation between two successive stops 30, 31. This partial angular movement is carried out each time the shaft 10 performs a longitudinal movement relative to the casing of the mowing head 1.

If it is desired to run a relatively long wire-shaped cutter 6 from the mowing head 1, pressure can be applied to the supporting and sliding disc 8 several times in succession. As can be seen from the above, in this second embodiment, the wire rod type cutter 6
The cutters 6 can be moved out of the mowing head little by little while being controlled. Therefore, it is possible to reliably prevent too much wire-shaped cutter 6 from running out of the mowing head 1. This means that two disks 20.21 facing each other
are arranged, and both disks form a limiter which limits the possible rotational movement of the transverse pin 12 via the stop 30.31, and the angularly limited incremental rotational movement of the pin It can only be achieved by allowing.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a mowing head according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 3, and Fig. 3 is a cross-sectional view taken along the line
4 is a sectional view showing a mowing head according to another embodiment; FIG. 5 is a view of the upper disk of the brake device from the direction of arrow H in FIG. 7; Figure 6 is the 7th
Figure 7 is a front view showing the lower and upper discs of the brake device, and Figure 8 is a stopper placed on the disc. FIG. 4 shows the arrangement of the transverse pin and the movement of the transverse pin relative to the stop during actuation of the shiftable shaft; 1.Mowing head, 2..Motor shaft, 3.14..
- Components, 5... Sliding sleeve, 6... Wire rod type cutter, 7... Storage coil, 8... Support and sliding disk, 9
・Ball bearing, 10... Shaft, 11... Guy r sleeve, 12... Lateral pin, 13... Friction disk,
14... Protuberance, 15... Stopper, 16... Disc, 17... Spring, 18... Casing portion, 19
...notch, 20.21...disk, 22...opening,
23... Stone S, 24... Pin, 26... Hole, 30, 3109. Sto, e Drawing 1 (no change in content) Fig. 1 8-11 Support and sliding 9 disk Fig. 2 1--To mowing grass, 7 de 10-
m-shimaft 6/-wire single chain hook
12... Lateral force direction and 7--Storage coil
15--Stopper 8 - Sentence 1 Miracle, Bones Circle 1 Anti +7--- IJ'
4 Figure 23... - Stopper 12 - Lateral force direction H 8 Figure 23 h °" Searching ~

Claims (1)

[Scope of Claims] 1. An automatic mowing head for a mower using an elastic wire or wire as a cutting tool, wherein the wire-shaped cutter (6) as the cutting tool cuts the mowing head (1) in the radial direction. ), which is wound around a storage coil (7) which is rotatably arranged inside the casing of the mowing head (1);
A shaft (10) projects from the underside of 1), which has a supporting and sliding disc (8) at its free end and which further extends into the interior of the mowing head (1). The end of the shaft with a stopper configured as a protrusion (
15, 23), said stop (15, 23) having a transverse pin (12) in operative connection with the wire cutter (15, 23);
6) is rigidly connected to the storage coil (7) receiving the support and sliding disk (8), the shaft (10) and the transverse pin (12) together under the action of the spring (17). The spring (17) is supported in the interior of the mowing head (1) on a transverse pin (12) and on a limiting wall of the upper casing part of the mowing head (1). An automatic mowing head for a mower, characterized by: 2. Mowing head according to claim 1, wherein the shaft (10) projecting into the casing of the mowing head (1) is received by a tubular guide member or guide sleeve (11). . 3. Mowing head according to claim 1 or 2, wherein the transverse pin (12) passes through a window-like opening or notch (19) integrally formed in the guide sleeve (11). . 4. Mowing head according to claim 1, wherein the supporting and sliding disc (8) is connected to the shaft (10) via a ball bearing (9). 5. Between the transverse pin (12) and the storage coil (7) receiving the wire-shaped cutter (6), there is a friction disk (13)
The mowing head according to any one of claims 1 to 4, in which a mowing head is arranged. 6. From the bottom of the mowing head (1) projects a centrally located ridge (14) with a circular cross section;
Mowing head according to claim 1, characterized in that the ridge forms a bearing and a guide for the storage coil (7). 7. A protruding stopper (15, 23) is constructed integrally with the upper side of the storage coil (7).
2. Mowing head according to claim 1, wherein the mowing coils (5, 23) are arranged radially offset towards the outside of the storage coil (7). 8. Mowing head according to claim 1, wherein the disc (16) supporting one end of the spring (17) is mounted on the transverse pin (12). 9. The spring (17) is configured as a coil spring;
A mowing head according to claim 1. 10. The spring (17) is under preload when the mowing head (1
) The mowing head according to claim 1, which is incorporated in a mowing head. 11. Shiftable device or support-sliding device (8) for locking or releasing the wire cutter; shaft (1);
0) and the guide sleeve (11), a braking device is assigned to the lower disk (20) and to the upper disk, which is non-rotatably operatively connected to the storage coil (7). It consists of a plate (21) and both discs (20, 2
1), a transverse pin (12) displaceable in the longitudinal direction (f) is arranged, and on opposite sides of the two disks (21, 20) there are stoppers ( 31, 30) are arranged in a staggered manner, these stops (31, 30) and the transverse pin (12) being operatively connected to the shaft (1) relative to the mowing head (1).
10. The mowing head according to claim 1, wherein the rotational movement in the wire-shaped cutter running direction is limited during each longitudinal shift of step 10). 12. The lower disk (20) has an aperture (22) in operative connection with a stop (23) which projects axially from the upper side of the storage coil (7) and which stops the storage coil (7). (7) and the lower disk (20).
Mowing head as described in section. 13. Mowing head according to claim 1, wherein both discs (21, 20) are connected to each other via pins (24) acting as spacers. 14. Stoppers (30, 31) configured as protrusions
2. The mowing head according to claim 1, wherein the mowing heads are arranged evenly distributed in the circumferential direction on mutually facing surfaces of the two discs (21, 20). 15. Stoppers (30, 31) configured as protrusions
has on one side a vertical stop surface (31a, 30a) in operative connection with the transverse pin (12) and on the other side an inclined surface (31b, 30b). The mowing head described in item 1.