Vsm Group Ab

Husqvarna Ab

Henrik Eklund

Mikael Larsson

Bertil Friman

Tomas Wykman

Björn Lundblad

Johan Assargård

Christian Bondesson

Hans Grufman

Åke Jönsson

Tom Dolk

The present disclosure relates to a carburetor assembly () comprising a control unit (), an air channel (), a throttle valve (), a choke valve (), a pulsed fuel valve (), and a fuel supply line (). The control unit () is adapted to control the fuel valve () to supply fuel in accordance with a certain start setting, where the choke valve () can be open or closed. The carburetor assembly () comprises a rotation angle detector assembly () with a choke detector part () that is mounted to a choke shaft () that is connected to the choke valve () such that the choke detector part () is arranged to rotate together with the choke valve (). The rotation angle detector assembly () further comprises a choke sensor device () that is connected to the control unit () and can be affected by the choke detector part () such that the choke sensor device () provides different output signals to the control unit () in dependence of whether the choke valve () is open or closed.

Carburetor assembly start setting detection arrangement

A hand-held power tool comprising an internal combustion engine (), a working tool (), a centrifugal clutch (), and a control system () is disclosed. The engine () has a clutch-in speed, above which the engine () drives the working tool (). The control system () comprises a rotation speed sensor (), and a speed limitation controller (), which is configured to limit an engine speed at a limitation speed below the clutch-in speed. It is active or activated during a starting procedure of the internal combustion engine (). The control system () is configured to deactivate the speed limitation controller () upon sensing at least one acceleration at a level above the limitation speed and sensing at least one deceleration at a level above the limitation speed, such that the engine () is rotatable above the limitation speed to drive the working tool ().

Hand-held power tool and thereto related control system and use and method of controlling

Herein a hand-held power tool comprising an internal combustion engine () is disclosed. The hand-held power tool comprises, a working tool (), a centrifugal clutch (), and a control system (). The internal combustion engine () has a clutch-in speed (&#x3c9;C) above which the internal combustion engine () drives the working tool (). A speed limitation controller (), is configured to limit an engine speed at a limitation speed below the clutch-in speed (&#x3c9;C). The control system () is configured to calculate an integral of the rotational speed of the internal combustion engine (), and to deactivate the speed limitation controller () after the integral reaches an integration limit value, such that the internal combustion engine () is rotatable above the limitation speed (&#x3c9;L) to drive the working tool () via the centrifugal clutch ().

Hand-held power tool, related control system and its use, and method of controlling said tool

Arrangement and methods for communicating data between a control system () of a power tool () and a computing device (). The arrangement () comprises a control system () with a plurality of electronic control units, ECUs (), a computing device (), and a connecting unit () comprising a data connection (). The plurality of ECUs () are connected to a common bus of the control system (). Each of the plurality of ECUs () has a passive service mode () and an active service mode (). The computing device is operable of transmitting a wake-up communication signal to the plurality of ECUs (), which wake-up communication signal comprises an ID of a selected ECU () out of the plurality of ECUs (). The selected ECU () is operable to switch from the passive service mode () to the active service mode () as a response to detecting its ID in the wake-up communication signal, so as to allow communication of data between the selected ECU () and the computing device () via the data connection.

Method for communicating data between a control system of a power tool and a computing device

A method and a device for cutting at least an upper thread of a sewing machine provided with a fabric clamping member (), wherein a length of the thread consumed for a cut can be set within a predetermined interval. The method for cutting at least the upper thread () of a sewing machine () includes the steps: feeding a predetermined length x of said upper thread () utilizing a thread feeder (), pulling out the upper thread () said predetermined length utilizing a displacement of said fabric clamping member () from a current position to a second position executing by means of a sewing machine processor (C) program sequences stored in a memory (M) for controlling a thread cutter () to perform a cut of at least said upper thread ().

Thread cut with variable thread consumption in a sewing machine

A method is provided for embroidering embroidery elements by means of a processor-controlled sewing machine (). The method includes: the fabric () that is to be embroidered is placed in the required position in relation to a threaded needle () on the sewing machine; a plurality of embroidery elements (A, B, C) in the form of software products having pre-programmed embroideries are provided; a group of said embroidery elements, defined as stitch data objects in a memory (M), is selected; an arbitrary curve (KU) along which said group of embroidery elements (A, B, C) shall be embroidered on said fabric () is defined by the operator of the sewing machine; said embroidery elements of said group are distributed in a spaced relationship along said curve utilizing a positioning algorithm. According to the method of the invention, a coupling between the embroidery elements of the group and the arbitrary curve is preserved during the full processing by said positioning algorithm.

Positioning of stitch data objects

A method and device for free-hand embroidering on a sewing material with a sewing machine which has a memory for stitch data for a sewing pattern and a processor for reading the stitch data and for causing the sewing machine to execute stitches according to stitch data, which sewing machine has a needle and a sewing material feeder for moving the sewing material in a direction, which processor controls movements according to the direction relative to the position of the needle for the execution of stitches according to the sewing pattern, and which method includes during use of the sewing machine in a free-hand mode: storage in the memory of stitch data for at least one stitch type for free-hand embroidering, choice of a stitch type, maneuvering, via first control signals, a movement of the sewing material feeder in any desired the direction by using a hand-operated control, detection of the first control signals in the processor, calculation in the processor, from the first control signals, of the direction and/or speed of the movement, and control of the sewing material feeder by the processor, via second control signals, for the execution of stitches in the direction and/or at the speed in accordance with stitch data for the chosen stitch type.

Machine-assisted free-hand embroidery method

A sewing machine including a needle that is supplied with an upper thread. A a reciprocating movement carries the upper thread through a sewing material and forms a loop beneath the sewing material. A shuttle houses a bobbin for lower thread and a shuttle arm catches the loop of the upper thread and carries the upper thread around the lower bobbin, so that a stitch is executed on the sewing material. A thread feeder feeds the upper thread to the needle and a control element on each stitch causes the thread feeder at the beginning of a stitch to advance a predetermined length of upper thread, including an excess thread, and at the end of the stitch to correct the length of the upper thread by recovering the excess upper thread, or advancing the further upper thread required.

Method and arrangement for a sewing machine

A sewing machine including a needle being supplied with an upper thread, a loop taker which accommodates a bobbin for a bottom thread, and a drive unit, which forces the needle to perform a reciprocating movement. The needle, during its movement and in cooperation with the loop taker, executes a stitch on a sewing material being advanced between the upper thread and the bottom thread. A take-up lever, for each stitch, pulls tight a knot being formed in the sewing material by the upper thread and the bottom thread in cooperation. The sewing machine further includes a thread transfer member supplying the needle with an upper thread with either a thread portioner or a friction braking assembly for friction braking of the upper thread. A switch switches between thread supply with the thread portioner or with the friction braking assembly. A control unit controls the thread supply from the thread portioner or, alternatively, controls the friction braking assembly.

Thread feed for a sewing machine

A sewing machine including an upper thread supply to a needle, a loop taker accommodating a bobbin for a bottom thread, a drive unit which through coupling elements affects a number of mechanical elements, of which the needle is one of the mechanical elements, to perform synchronous cyclic movements between themselves, wherein the needle during its movement in cooperation with the loop taker performs stitches on a sewing material which is transported between upper thread and bottom thread, by means of a take-up lever which in each stitch pulls tight a knot, which is formed in the sewing material by the upper thread and the bottom thread in cooperation, wherein the sewing machine includes a sensor function that detects a deviation between a set value for a point of time at which a predetermined value for a tensile force in the upper thread is reached at pull tight of a knot and an actual value at the time of point where the predetermined value of the tensile force in the upper thread is reached at pull tight of the knot, and wherein the sewing machine includes control means for the control of the means being used to supply upper thread to the needle, so that the deviation between a first position and a second position is brought to zero.

Growing community of inventors

Tenhult, Sweden

Henrik Eklund