Patent Application
20070029048
1. Field of the Invention
The present invention relates to a magnetic adhesive tape holder, and more particularly to a holder which can automatically cut a roll of magnetic adhesive tape with a predetermined length and stick the cut segment of the magnetic adhesive tape.
2. Description of Related Art
A magnetic adhesive tape includes an adhesive side which is generally combined with a substrate tape. The magnetic adhesive tape and the substrate tape are reeled as a single roll. In use, the roll of magnetic adhesive tape is unreeled and cut off with a desired length. Thereafter, the cut segment of magnetic adhesive tape can be stuck on an article, and the article with the magnetic adhesive tape can be attracted on an iron product such as a refrigerator.
However, it is very inconvenient to manually cut off the magnetic adhesive tape and to control the length of the cut segment.
Therefore, the invention provides a magnetic adhesive tape holder to mitigate or obviate the aforementioned problems.
The main objective of the present invention is to provide a magnetic adhesive tape holder which can automatically cut off a segment of the magnetic adhesive tape with a predetermined length.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
A lower housing (20) is movably received in the upper housing (10) and has a second rear wall (21), and two opposed second sidewalls (22) perpendicular to the second wall (21). Two slots (220) are respectively defined through the opposed second sidewalls (22), and two second pins (221) are respectively formed above the slots (220). The first pins (14) are respectively inserted in the slots (220) and located beneath the second pins (221). Two first resilient members (60) are respectively connected between the first pins (14) and second pins (221) to elastically position the lower housing (20) in the upper housing (10).
A clamping member (30) is formed on the first rear wall (11) of the upper housing (10). An opening (210) is defined through the second rear wall (21) and the clamping member (30) extends in the lower housing (20) through the opening (210). The clamping member (30) includes a movable damper (31) pivotally mounted on the first rear wall (11). An eccentric cam (32) is rotatably mounted beside the movable damper (31). The movable damper (31) is pushed by a torsion spring (33) to abut the eccentric cam (32). Two stationary dampers (34) are provided beside the movable damper (31) and opposite to the eccentric cam (32). Thus, a space is defined between the movable damper (31) and the stationary dampers (34). A first stop pin (35) and a second stop pin (36) are respectively formed above and beneath the eccentric cam (32).
A pushing member (80) includes a rotating cam (81) pivotally mounted on the first rear wall (11). A first stop lug (83) and a second stop lug (84) are respectively provided at two opposed sides of the rotating cam (81). The rotating cam (81) has an arcuate edge facing the first stop lug (83) and a substantially straight edge facing the second stop lug (84). A guide slot (211) is defined at a back surface of the second rear wall (21) and in communication with the opening (210). A push bar (82) is movably received in the guide slot (211), i.e., provided between the first rear wall (11) and the second rear wall (21). A bolt (821) is formed at a bottom end of the push bar (82) and extends through a hole (212) defined at a bottom end of the second rear wall (21). The rotating cam (81) is able to be inserted into the opening (210) along the guide slot (211).
The second rear wall (21) has a first step (214) formed in the opening (210). The first step (214) is located in the guide slot (211) and aligned with the rotating cam (81). A second step (215) is also formed in the opening (210) and beneath the first step (214) and aligned with the eccentric cam (32). A first stopping portion (216) and a second stopping portion (217) are formed at a top of the opening (210), wherein the first stopping portion (216) faces the rotating cam (81) and the second stopping portion (217) faces the eccentric cam (32). The rotating cam (81) will be pivoted upwards when it is pushed by the first step (214), and will be pivoted downwards when it is pushed by the first stopping portion (216). The eccentric cam (32) will be rotated clockwise when it is pushed by the second step (215), and will be rotated counterclockwise when it is pushed by the second stopping portion (217). The rotations of the rotating cam (81) and the eccentric cam (32) will be further described hereinafter.
A cutting member (50) is provided at the bottom of the second rear wall (21). The cutting member (50) has an arm (51) with a pivot end and a free end. The bolt (821) extending through the hole (212) is inserted in the arm (51), so the arm (51) will be pivoted about the pivot end when the push bar (82) is moved. A first blade (movable blade) (52) is provided at the free end of the arm (51). A second blade (immovable blade) (53) is secured on the second rear wall (21) and located beneath the first blade (52) and beside the hole (212). A gap is defined between the first blade (52) and second blade (53). An arcuate elastic iron strip (54) is provided on a bottom surface of the arm (51), and a second resilient member (55) is provided at the pivot end of the arm (51) to make the free end of the arm (51) ascend.
Two parallel axles (23) are rotatably mounted on the second rear wall (21) and above the cutting member (50). A gear assembly (40) includes a first gear (41) and a second gear (42) respectively mounted on the axles (23) and engaged with each other. A first pole (410) is formed on the center of the first gear (41), and a second pole (420) is formed on the center of the second gear (42). A roll of magnetic adhesive tape (70) with a substrate tape (701) is provided on the first pole (410), and a sleeve (75) is provided on the second pole (420). The magnetic adhesive tape (70) is formed with a magnetic side and an adhesive side stuck on the substrate tape (701).
Three lower rollers (24), including a top one and two bottom ones arranged as a triangle, are provided under the axles (23) and beside the free end of the arm (51). A shield (27) is formed above the bottom one of the lower rollers (24) that is adjacent the second blade (53). An upper roller (25) is provided above the eccentric cam (32).
The magnetic adhesive tape (70) extends over the top lower roller (24) and the magnetic side of the magnetic adhesive tape (70) is attracted on the arcuate elastic iron strip (54). The substrate tape (701) is separated from the magnetic adhesive tape (70) and extends over the two bottom lower rollers (24). Then, the substrate tape (701) extends upwards between the movable damper (31) and the stationary dampers (34) and over the upper roller (25) to be reeled on the sleeve (75).
In a non-use status, the magnetic side of the free end of the magnetic adhesive tape (70) is attracted on the arcuate elastic iron strip (54). The substrate tape (701) extends through the spacing between the movable damper (31) and stationary clampers, i.e., the substrate tape (701) is not clamped by the clamping member (30). Under the force of the resilient members (60), the upper housing (10) is pushed away from the lower housing (20). The rotating cam (81) is partly received in the guide slot (211) and is disengaged from the push bar (82).
In use, with reference to
With reference to
With reference to
In this case, the push bar (82) can not be pushed downwards further while the first stopping lug (83) is blocked by the first step (214) to disable the upper housing (10) to move downwards. The rotating cam (81) is pushed by the first step (214) to further pivot towards the second stopping lug (84) while the arcuate edge of the rotating cam (81) abuts the push bar (82). At the same time, the eccentric cam (32) is pushed by the second step (215) to pivot clockwise, so the movable damper (31) is pushed by the eccentric cam (32) to pivot towards the stationary damper (34). Therefore, the substrate tape (701) is clamped by the movable damper (31) and stationary dampers (34). In this case, the eccentric cam (32) is positioned by the movable damper (31) and the first stop pin (35) and will not automatically pivot backwards to the original status for ensuring the substrate tape (701) to be clamped by the movable damper (31) and stationary dampers (34).
With reference to
With reference to
With reference to
Therefore, by pressing the upper housing (10), a segment of magnetic adhesive tape (70) with a certain length is cut off and stuck on the article. By releasing the upper housing (10), a segment of magnetic adhesive tape (70) with the same length is pulled out for the next cutting. Therefore, the roll of magnetic adhesive tape (70) can be automatically and easily cut off with a determined length for being stuck on the article
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
