1. Technical Field
This present disclosure relates to cutting structures, and particularly, to a cutting structure for plastic film.
2. Description of Related Art
Plastic film is generally used for keeping foods fresh or protecting electrical devices from being contaminated. For convenience, users often unwind the plastic film from a roller so that the plastic film can be pulled out due to a rotation of the roller. However, users cannot effectively and sufficiently control the pulling length of the plastic film, therefore, waste may occur when too much of the plastic film is pulled out.
Therefore, it is desirable to provide a cutting structure for plastic film, which can overcome or at least alleviate the above-mentioned limitations.
Referring to
The bracket 100 includes a bottom 110 and two opposite sidewalls 120 extending from two opposite edges of the bottom 110 correspondingly along a same direction. The sidewalls 120 are substantially perpendicular to the bottom 110. Each sidewall 120 defines a cutout 121 for respectively receiving the ends of the first roller 200. In the present disclosure, the bottom 110 and the cutout 121 both are rectangular.
The first roller 200 is parallel to the bottom 110. The first roller 200 includes a columned shaft 210 and a columned sleeve 220 sleeved on the columned shaft 210. The sleeve 220 can be rotated around the shaft 210 due to a force applied thereon. Two opposite ends of the shaft 210 respectively extend a positioning block 230 received in the cutout 121. The cross-section of the positioning block 230 is rectangular corresponding to the cutout 121.
The second roller 300 is also column-shaped and parallel to the bottom 110. The second roller 300 is pivotably connected to the sidewalls 120 and can rotate relative to the bracket 100.
The tachometer 400 is disposed on one end of the second roller 300 and outside the sidewall 120 of the bracket 100. The tachometer 400 is configured for measuring the rotation speed, e.g., the rotations per minute, of the second roller 300.
The processor 500 is electrically connected to the tachometer 400 and configured for reading the rotations of the tachometer 400 and calculating a rotation distance of the second roller 300. The processor 500 further connects to a monitor 510 for displaying the rotation distance.
The cutter 600 is positioned at an end of the bracket 100 adjacent to the second roller 300. The cutter 600 extends upward from the bottom 110. In the present disclosure, the cutter 600 is integrated with the bottom 110 and substantially perpendicular to the bottom 110. The edge of the cutter 600 includes a sensor 610 for detecting a touching or approaching signal from the plastic film 20, and then activates the tachometer 400 and the processor 500. It is noteworthy that the sensor 610 can be an infrared sensor, a touch sensor, a pressure sensor, or a proximity sensor. In the present disclosure, the sensor 610 is a touch sensor.
It is noteworthy that the tachometer 400 or the processor 500 may further includes a clear button 410 for clearing the rotation distance stored in the tachometer 400 when a cutting is finished. In the present disclosure, the clear button 410 is disposed on an outer surface of the tachometer 400 and the users can easily press on the clear button 410 to restart the tachometer 400 and the processor 500.
Referring to
While various exemplary and preferred embodiments have been described, it is to be understood that the disclosure is not limited thereto. To the contrary, various modifications and similar arrangements (as would be apparent to those skilled in the art), are also covered. Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
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Number | Date | Country | |
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20110179927 A1 | Jul 2011 | US |