CONTROL METHOD AND DEVICE FOR POWERED EQUIPMENT

Abstract

A control device for a piece of powered equipment having an electronic sensor and an electronic control board for controlling the equipment depending on a control signal from the sensor. The electronic sensor is a contactless optical sensor, provided in an interface area of the control device, configured to measure a distance separating at least one target, located in the interface area, and the optical sensor, the electronic board being configured to establish a first control of a main function of the powered equipment, when a signal from the optical sensor is established for a measured distance within a first range of distances, and to establish a control for at least one additional function of the powered equipment, different from the main function, when a signal from the optical sensor is established for a measured distance greater than the first range of distances.

Claims

1. Control device for a piece of powered equipment, comprising at least a sensor, and an electronic board for controlling the equipment based on at least one signal from the sensor, characterized in that the electronic sensor is a contactless optical sensor, provided in an interface area of the control device, configured to measure a distance separating at least one target, located in the interface area, and the optical sensor, the electronic board being configured to establish a first control of a main function of the powered equipment when a signal from the optical sensor is established for a measured distance within a first range of distances, and to establish a control for at least one additional function of the powered equipment, different from the main function, when a signal from the optical sensor is established for a measured distance greater than the first range of distances.

2. Control device according to claim 1, in which the control device comprises also a control element provided in the interface area.

3. Control device according to claim 2, comprising a position sensor linked to the control element, the position sensor being connected to the electronic board.

4. Control device according to claim 2, in which the control element has a stroke limited to the first range of distances.

5. Control device according to claim 1, in which the electronic board is configured to establish the first control of the main function of the powered equipment from the optical sensor signal.

6. Control device according to claim 3, in which the electronic board is configured to establish the first control of the main function of the powered equipment from a signal of either the optical sensor or the position sensor.

7. Control device according to claim 3, in which the electronic board is configured to establish the first control of the main function of the powered equipment from the signal of the optical sensor, and a second control of the main function of the powered equipment from the signal of the position sensor of the control element.

8. Control device according to claim 7, in which the electronic board is configured to compare the first and the second controls of the main function, and to activate an equipment safety procedure in case of any divergence of the first and the second controls.

9. Control device according to claim 3, in which the target comprises at least one finger of the user, and in which the control element comprises a trigger that can be actuated by the user's finger, the trigger having a maximum stroke between a released position and a depressed position, in which the first range of distances corresponds to the maximum stroke of the trigger.

10. Control device according to claim 2, in which the target comprises at least one finger of the user, and in which the control element comprises a trigger that can be actuated by the user's finger, the trigger being located in a measurement field of the optical sensor and featuring an opening in a support area for the user's finger, the opening being aligned on the measuring field of the optical sensor.

11. Control device according to claim 2, in which the target comprises the control element.

12. Control device according to claim 1 for a portable powered tool, in which the control of the main function is a control in proportion to the motor rotation speed up to a maximum speed setpoint, and in which the additional control is at least one among a change control of the maximum rotation speed setpoint of the motor, a change control of the operating mode, a control for safety procedure, or a reversing control of the motor rotation direction.

13. Control device according to claim 1, for a tool selected between electric pruning shears and snips, in which the control of the main function is a control of the stroke of a movable blade of the tool between a maximum opening position defined by a setpoint, and a closed position.

14. Control device according to claim 13, in which the control for the additional function is a change control of the maximum opening stroke setpoint for the movable blade.

15. Portable power tool, comprising an electric motor, a movable active element, and transmission connecting the active element to the motor, and a control device according to claim 1.

16. Control method for powered equipment, equipped with a control interface with an optical sensor, capable of measuring the distance of at least one target, comprising the establishment of a first control of a main function for the powered equipment, whenever the target is far from the sensor by a distance comprised within a first range of distances, and comprising the establishment of a control for at least one additional function of the powered equipment, different from the main function, whenever the target is far from the sensor by a distance greater than the first range of distances.

17. Method according to claim 16, in which the control of the main function is established from one among the distance measurement signal established by the optical sensor, a signal established by a position sensor linked to a control element of the control interface, and a combination of the signals from the signals of the optical sensor and from the position sensor.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0044] FIG. 1 is a schematic representation of a control device under the invention.

[0045] FIG. 2 shows the device from FIG. 1 equipped with a trigger.

[0046] FIG. 3 is a view, with a partial cutaway of its lower part, of a pruning shear using a control device according to the invention.

DETAILED DESCRIPTION OF MODES OF IMPLEMENTATION OF THE INVENTION

[0047] In the following description, with reference to the figures on the drawings, identical or similar parts are identified with the same reference characters so that it is possible to refer from one figure to the next.

[0048] The control device in FIG. 1 is used to control a portable tool S shown only in part. It shows an interface area 10, delineated by a guard 12, and the measurement field of an optical sensor 14 provided in the body of tool S. The sensor is connected to an electronic board 16 through an electric connection 18. The electric connection 8, for example of the serial type, provides power supply for the sensor and transmits a measurement signal to the electronic board 16. If applicable, the electronic board 16 can comprise a power supply for the optical sensor 14.

[0049] The electronic board provides a control for a motor 20 shown very schematically. It can be a power supply from a battery not shown, controlled and applied to the different phases of an electric motor. It can also be an intake control of a gas-powered motor. The motor 20 is connected to an active element 24 of the tool through a gear 22. The gear is also designed to convert the rotation of the motor into an adequate movement to actuate the active element. The active element can be, for example, a cutting tool.

[0050] The electronic board 16, motor 20, gear 22, and active element 24, shown very schematically on FIG. 1, are built into the equipment or tool S of which they are an integral part.

[0051] The reference 30 designates a measurement target for which sensor 14 measures the distance away. In the example of the figure, it is a finger of the user. It is for example a finger on the hand that grasps the tool or a handle on the tool not shown.

[0052] The target 30 is shown on the figure at a distance d, indicated by a double arrow, which separates the target from the sensor, or more specifically which separates it from the body of the tool at the location of the sensor. The distance d corresponds to the maximum proximate distance mentioned in the first part of the description, i.e., the greatest separation distance from the first range of distances 31. The first range of distances 31, which governs the establishment of a control of the main function of the tool, extends from a minimum value to maximum value d. The minimum value, which can be zero, corresponds to the measured distance when the target 30 is the closest to the sensor 14, for example against the sensor, or against the wall of the structure including the sensor. The maximum value, in the first range of distances, is distance d, in this case the maximum proximate distance. In that range, the movement of the target can be used to establish the control of the main function. It can for example be a progressive control of the speed of the motor 20 or a control of the stroke of a cutting element. One can refer to the above description in that regard.

[0053] An arrow F indicates a possible excursion of the target outside the first range of distances 31, while remaining within the measurement field of the sensor and within the interface area 10. The separation between the target 30 and the sensor 14 becomes then, at least for a moment, greater than the value of the distance d. The measurement signal for a distance greater than distance d, established by the sensor, is used by the electronic board 16 to establish an additional control. Here again, and with reference to the above description, it can be for example, a modification of an operating setpoint, of a position setpoint of a cutting element, or of a rotation speed setpoint of the motor.

[0054] FIG. 2 shows a control device similar to FIG. 1, but which is equipped with a control element in the interface area 10. In the example on the figure, this is a trigger 34 that can be actuated by a finger of the user.

[0055] The relative arrangement of the sensor 14 and the trigger 34 is such that the measurement field is focused on the trigger 34. Thus, the trigger, or at least part of the end of the trigger in the measurement field of the sensor, makes up the target. The distance measured by the optical sensor is no longer the separation from the finger but from the trigger.

[0056] Since the trigger is used as a measurement target for the optical sensor 14, its rest position can be used as reference for automatic calibration of the maximum value d of the first range of distances. The trigger cannot be further away from the sensor 14 outside the first range of distances, to activate the control of the additional function. In such embodiment of the control element, the measurement field of sensor 14 can however be designed sufficiently wide to detect the presence of a finger at the trigger. This permits to define a distance d1 that corresponds to the finger positioned on the trigger in rest position at the distance d. The difference between the distance d1 and the distance d corresponds simply to the thickness of the trigger. Thus, in spite of the impossibility to move the trigger beyond the distance d, detection of the finger position beyond the distance d1 can be used to activate the additional function.

[0057] Preferably, the trigger is provided in its center with an opening or slot, enabling the sensor 14 to establish in a direct and more reliable manner the distance d1, while being capable of calibrating the distance d. The distance d1 can also be established directly through calculation in the electronic board by parameterizing the thickness characteristics of the trigger.

[0058] The trigger 34 can also be a dummy control. It can for example be mounted in a pivoting manner on a pivot 35 and comprise at that level an elastic return system, known as a spring. It can also be used as a target or reference mark for the user's finger. It can also be a force return that enables the user to better be aware of the position of his finger.

[0059] The trigger can also be connected to a position sensor 15, for example, a sensor measuring its angular stroke around the pivot 35. The sensor 15 is then connected to the electronic board through a proper electrical connection 19, through which it provides the electronic board 16 with a measurement signal. Thus, the electronic board 16 can be configured to establish the motor control, and especially the control of the main function, either from the signal of the trigger sensor, or from the optical sensor signal. Both signals can be used in the manner described above.

[0060] FIG. 3 shows an improved embodiment of the control device applied to a pruning shear 40.

[0061] The control device is equipped with a trigger 34 that, just like the interface area 10, is located close to a part of the casing forming a handle 42 for the pruning shear. Thus, the user's finger, used as target, can be a finger on the hand that grasps the handle 42.

[0062] FIG. 3 shows in partial cutaway, an electric motor 44, and a gear connecting the motor to a movable blade 46 on the pruning shear. The movable blade 46, together with a fixed blade 48, makes up the active element 24.

[0063] The gear comprises a reducer 50, a mechanism 52 for conversion of the motor rotation into translation, such as a ball screw, and link rods 54 connecting the mechanism 52 to a cam of the movable blade.

[0064] FIG. 3 also shows the electronic board 16, equipped with a microprocessor, the optical sensor 14, connected to the board through the electric connection 18, and the sensor 15 used to determine the position of the trigger. In this case, it is a hall effect sensor.

[0065] The electric motor 44 is driven by another electronic control board located in a power supply unit with an accumulator battery that is not shown. This electronic control board drives the motor based on controls transmitted by the electronic board 16 located inside the body of the pruning shear.

[0066] A connecting cord, not shown, ensures the electric connection with the power supply unit. The cord comprises electric conductors to drive the motor, the power supply of the electronic board power supply for the pruning shear, and the transfer of various control signals, for example through a serial link.

[0067] For the pruning shear 40, the main function control established by the board is, for example, a control of the rotation of the motor, and of its rotation direction, to initiate the movement of the movable blade toward the fixed blade, or inversely for the return of the movable blade to its open rest position.

[0068] The main function control can be a control of the maximum stroke setpoint for the movable blade. For example, to achieve a greater stroke. These operating modes are described above.

[0069] According to an especially advantageous improvement of the control device, shown in FIG. 3, the optical sensor 14 features a measurement field in a leading direction that coincides with an opening 33 made in the trigger. The opening takes here the form of a longitudinal slot extending over a part of the trigger, which accommodates one or more fingers of the user's hand.

[0070] Because of the opening 33, the trigger does not hinder the measurement of the optical sensor that can be done on the finger(s) used as target, like the device in FIG. 1.

[0071] The rest position of the trigger is preferably such that the finger is at the maximum proximate distance, i.e., at the end of the first range of distances whenever it is simply placed on the trigger in rest position. The trigger travels from the rest position toward the sensor 14 within the first range of distances. Such travel corresponds to the range for which the main function control is established. For a control of the additional function, the finger that makes up the target, moves away from the trigger in rest position.