Method and device for making a hole in a golf green

A device for making a hole in a golf green, the device having a longitudinal direction, a radial direction and an angular direction, comprising:

• a cutting cylinder with an axis parallel to the longitudinal direction and an open end being freely movable along the longitudinal direction;
• a structure, comprising guide means defining a weight path having a first endpoint and a second endpoint;
• a weight, in engagement with said guide means to be guidedly movable along said weight path;
• and
• a weight propulsion device, arranged to propel the weight reciprocally along said weight path between said first endpoint and said second endpoint so that the weight strikes against the cutting cylinder when the weight is at a location along said weight path, in turn urging the cutting cylinder in the longitudinal direction,
• wherein weight propulsion device comprises:
• a first electric motor, arranged to drive a drive axle to rotate about a rotary axis under influence of a rotary force provided by the first electric motor;
• a spring means, arranged to be activated, in a first stage and against a spring force of the spring means, whereby a potential energy is stored in the spring means, and in a second stage to release the potential energy by relaxing the spring means and to thereby transform the potential energy into kinetic energy of the weight striking against the cutting cylinder;
• and
• a force mediating device, arranged to, during the first stage, engage the drive axle with the spring means to mediate the rotary force to the spring means in turn activating the spring means and, during the second stage, disengage, using an active or passive disengagement mechanism, the drive axle from the spring means to allow the spring means to release the potential energy independently of a rotary movement of the drive axle.