摘要:
A control system for a weld motor for a strapping machine is based upon the number of rotations of the weld motor. The system is used in a strapping machine of the type having a body, an anvil mounted to and movable relative to the body, a sealing member disposed for oscillating movement relative to the anvil and a motor operably connected to the sealing member to provide oscillating movement to the sealing member. Movement of the sealing member seals overlying courses of strapping material to one another. The control system includes a sensed element located on a rotating portion of the motor, a sensor for generating a signal at each instance of sensing the sensed element, a counter operably connected to the sensor for counting the instances of the sensed element and a controller for controlling operation of the motor based upon the counting of the instances of the sensed element. A method for controlling a motor is also disclosed.
摘要:
A binding tool of friction welding type for tightening a strap of thermoplastics material around an object and frictionally welding overlapped portions of the strap together by relatively vibrating them and applying pressure to them, the tool comprising: means for tightening the strap, first strap portion pressure support means for fixing and supporting a first portion of the strap, second strap portion vibrating means for vibrating a second portion of the strap when overlapped with the first strap portion fixed on the first strap portion pressure support means, driving means for driving the second strap portion vibrating means and vibrating the same, pressure means for moving and pressing the second strap portion vibrating means against the first strap portion pressure support means, and means for removing the pressure means and the second strap portion vibrating means after completion of the friction welding together of the first and second strap portions.
摘要:
An apparatus is provided for creating an improved configuration of overlapping lengths (L1, L2) of flexible thermoplastic strap to accommodate the formation of an improved joint between the strap portions. The apparatus includes first and second strap engaging members (21, 22) respectively defining first and second contoured surfaces (81, 82) for engaging respectively first and second strap lengths to position the joint portions between the strap engaging members in an overlapping relationship along an interface region and to position the trailing portion of each strap length to extend in a plane generally parallel to a reference plane with at least a part of the length of the interface region being non-parallel to the reference plane. In the preferred embodiment, the strap engaging members are each provided with a convex surface and a concave surface and are disposed to align the concave surface of one member generally in registry with the convex surface of the other member.
摘要:
A method and apparatus is provided for securing together overlapping portions of a thermoplastic strap loop around an object. The overlapping strap portions are forced together in face-to-face contact under pressure. During or before the step of forcing the strap portions together, the energy in the strap portions is increased so as to melt at least a part of the thickness of each strap portion at the interface region. One embodiment of the method also includes forming a plurality of cavities that are distributed across the width of the molten parts adjacent the ends of the molten parts and that are surrounded by the molten parts. The step of increasing the energy is then terminated, and the strap portions at the interface region subsequently solidify, to encapsulate the cavities and form the welded joint. In another, and preferred, embodiment of the invention, the pressure on the strap portions is released while the parts of the strap portions are molten (whether or not cavities are present), and the strap portions at the interface region subsequently solidify in the absence of pressure.
摘要:
The invention relates to a mobile strapping apparatus (1) comprising a base frame (11), a tensioning apparatus (12) having a tensioning wheel (13) provided with a contoured lateral surface (15), a drive unit (26) which is provided at least for driving the tensioning wheel (13), a counter-support element (20) which interacts with the tensioning wheel (13) and which is arranged opposite a contact point (27) located between the tensioning wheel (13) and the strapping band (3), a friction welding apparatus (45), a cutting-off apparatus (57), a band return block (28) having a blocking element (30) by way of which a return movement of the band end (6) counter to the tensioning direction (29) thereof is preventable, and a power supply source for providing drive power. The counter-support element (20) is provided with a contoured surface (21) and is positioned such that a frictional and/or force-fitting connection to a portion located closest to the band start (5) of the strapping band (3) is producible by way of the counter-support element (20), and a relative movement between the band start (5) of the strapping band (3) and the counter-support element (20) is preventable.