Platen roll core
AssigneeInabata Techno Loop Corporation
InventorTadao Inabata
Life of this patent
Estimating the term…
Abstract
A platen roll core has a plurality of roll elements, and spacers interposed between adjacent roll elements of attenuation of propagated vibrations. The core, seen in terms of vibrating system, is equivalent to the sum of vibrating systems independent of one another and corresponding to the respective roll elements. The axial length of each roll element is set to such a value that the natural frequency thereof in an axial flexural oscillation mode is greater than a frequency of vibration applied from a vibration source, to thereby avoid the resonance of the core in the axial flexural oscillation made with the vibration source, such resonance being a main cause of an increase in noise level.
Claims19
A platen roll core, comprising:
- at least two roll elements comprising a first material and disposed lengthwise adjacently on an axis of a common shaft, each having a predetermined individual axial length such that a natural frequency thereof in an axial flexural oscillation mode is different from an expected predetermined frequency of vibration applied to said platen roll core from a vibration source during use of the platen roll core;
- and
- at least one spacer comprising a second material and interposed between adjacent ends of said at least two roll elements, for attenuating any vibrations propagated therethrough, said spacer being supported by said common shaft,
- wherein a first ratio, formed by dividing the length of the platen roll core by the length of a roll core element, is a non-integer value for any of said at least two roll elements.
A platen roll core, comprising:
- at least two roll elements comprising a first material and disposed lengthwise adjacently on an axis of a common shaft, each having a predetermined individual axial length such that a natural frequency thereof in an axial flexural oscillation mode is different from an expected predetermined frequency of vibration applied to said platen roll core from a vibration source during use of the platen roll core;
- and
- at least one spacer comprising a second material and interposed between adjacent ends of said at least two roll elements, for attenuating any vibrations propagated therethrough, said spacer being supported by said common shaft,
- wherein said spacer comprises a flat disc made of resin and a thin corrugated plate, comprising a vibration-damping metal, embedded therein.
A platen roll core, comprising:
- at least two roll elements comprising a first material and disposed lengthwise adjacently on an axis of a common shaft, each having a predetermined individual axial length such that a natural frequency thereof in an axial flexural oscillation mode is different from an expected predetermined frequency of vibration applied to said platen roll core from a vibration source during use of the platen roll core;
- and
- at least one spacer comprising a second material and interposed between adjacent ends of said at least two roll elements, for attenuating any vibrations propagated therethrough, said spacer being supported by said common shaft,
- said roll elements being formed to each have a cavity, and said spacer separates the cavities of adjacent roll elements from each other,
- said shaft portion, said cylinder portion and said rib portion of each element being formed to each have protrusions inside said cavities, whereby any sound waves propagated in the cavities are irregularly reflected, and
- said protrusions on said cylindrical portion being formed as plural axially oriented parallel ridges, said ridges on an outer peripheral surface of the cylindrical portion having trapezoidal cross-sections and said ridges on an inner peripheral surface of the cylindrical portion having rectangular cross-sections.
Dependencies are inferred from the claim text.