The disclosure relates to a power-transfer unit for a sealing unit of a packaging machine comprising a support, intended to be attached to a sealing unit, a power bar comprising a contact-initiation section, a contact-termination section, and an intermediate section therebetween, the power bar being
The disclosure relates to a power-transfer unit for a sealing unit of a packaging machine comprising a support, intended to be attached to a sealing unit, a power bar comprising a contact-initiation section, a contact-termination section, and an intermediate section therebetween, the power bar being resiliently suspended in the support and being movable along a first direction being normal to a contact surface of the intermediate section. The power bar is suspended in the support by a first leaf spring.
대표청구항▼
1. A power-transfer unit for a sealing unit of a packaging machine comprising a support, intended to be attached to a sealing unit,a power bar comprising a contact-initiation section, a contact-termination section, and an intermediate section therebetween, said power bar being resiliently suspended
1. A power-transfer unit for a sealing unit of a packaging machine comprising a support, intended to be attached to a sealing unit,a power bar comprising a contact-initiation section, a contact-termination section, and an intermediate section therebetween, said power bar being resiliently suspended in the support and being moveable along, a first direction being normal to a contact surface of said intermediate section,wherein the power bar is suspended in the support by means of a first leaf spring. 2. The power-transfer unit of claim 1, wherein the first leaf spring extends along a rectilinear path between the support and the power bar. 3. The power-transfer unit of claim 1, wherein the power bar is suspended in the support by means of an additional second leaf spring. 4. The power-transfer unit of claim 3, wherein the second leaf spring has substantially the same length as the first leaf spring, and is arranged in parallel with the first leaf spring, but separated a distance in the first direction, such as to prevent rotation of the power bar in a plane defined by a central axis of the first leaf spring and a central axis of the second leaf spring. 5. The power-transfer unit of claim 1, wherein a coil spring is arranged between the support and the power bar to provide a biasing force in said first direction. 6. The power-transfer unit of claim 5, wherein the coil spring provides a positive expansion force, and comprises a spring guide extending along a central axis of the coil spring. 7. The power-transfer unit of claim 5, wherein the coil spring is arranged at an angle to said first direction. 8. The power-transfer unit of claim 7, wherein the coil spring is arranged to increase its angle to said first direction when the power bar is depressed. 9. The power-transfer unit of claim 1, wherein separate conductors are arranged for transfer of electrical power. 10. The power transfer unit of claim 9, wherein two braids are used for transfer of current to and from the power bar, respectively. 11. The power transfer unit of claim 10, wherein the two braids are arranged in parallel, facing each other. 12. The power-transfer unit of claim 1, wherein either one of the leaf springs are used for transfer of electrical power. 13. The power-transfer unit of claim 1, wherein the contact-initiation section and the contact-termination section are provided by a ramp sloping with and reverse to said first direction, respectively. 14. The power-transfer unit of claim 1, wherein the total length of the contact-initiation section and the contact termination section exceeds half the length of the intermediate section. 15. The power transfer unit of claim 1, wherein each support comprises two, individually suspended power bars. 16. A power bar adapted for arrangement in a power transfer unit according to claim 4, said power bar comprising attachment points for two leaf-springs and for a coil spring, anda contact-initiation section, a contact-termination section, and an intermediate section therebetween. 17. A power-transfer unit for a sealing unit of a packaging machine that seals packaging material, the power-transfer unit comprising: a support configured to be attached to a sealing unit;a power bar configured to contact a brush of a sealing jaw, the power bar including a conductor part made of conductive material and comprising a contact-initiation section in which contact pressure between the power bar and the brush increases, a contact-termination section in which contact pressure between the power bar and the brush decreases, and an intermediate section positioned between the contact-initiation section and the contact-termination section in which contact pressure between the power bar and the brush remains constant, the intermediate section possessing a contact surface configured to contact the brush;the power bar being resiliently suspended in the support and being moveable along a first direction normal to the contact surface of the intermediate section; andthe power bar being suspended in the support by a first leaf spring interconnecting the support and the power bar. 18. The power-transfer unit of claim 17, further comprising a second leaf spring by which the power bar is suspended in the support. 19. The power-transfer unit of claim 18, wherein the first and second leaf springs are parallel to one another, are spaced apart from one another and possesses substantially the same length. 20. The power-transfer unit of claim 17, further comprising a coil spring between the support and the power bar to apply a biasing force to the power bar in the first direction.
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