Patent Publication Number: US-2012046152-A1

Title: Bag neck sealer

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a bag neck sealer. 
     2. Description of the Prior Art 
     A plastic bag is used to carry articles. In order to prevent the fall of the articles, a bag neck sealer can be used to seal the open end of the bag. Referring to  FIG. 1 , a conventional bag neck sealer comprises a base  1 . The base  1  has a guide trough  2  thereon, and an installation wheel  3  is installed on the base  1 . A rotary wheel  4 , a press plate  5 , a movable blade unit  6  and a fixed blade unit  7  are provided close to the guide trough  2 . When using the bag neck sealer, the user has to install a roll of adhesive tape  8  on the installation wheel  3  and pull out the tape to be adhered on the press plate  5 . After that, the open end of the bag to be sealed is slid into the guide trough  2  to seal the open end of the bag by the rotary wheel  4  and the press plate  5 . Finally, the movable blade unit  6  is to cut off the tape and the fixed blade unit  7  is to cut off the unnecessary portion of the bag to complete the seal of the bag. However, the fixed blade unit  7  of the conventional bag neck sealer is disposed at an outer side of the base  1 , and there is no protection device. When operating the bag neck sealer, the fingers of the user may be hurt. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve this problem. 
     SUMMARY OF THE INVENTION 
     The present invention is to provide a bag neck sealer which comprises a base. The base has a guide trough and an installation wheel thereon. A rotary wheel, a press plate and a movable blade unit are provided close to the guide trough. A fixed blade unit is provided on one side of the base and located close to the guide trough. The fixed blade unit has a seat. The seat has a cutting slot corresponding to the guide trough of the base. The seat comprises a fixed blade. The fixed blade has an edge across the cutting slot. The seat further comprises a protective piece. The protective piece is connected with an elastic member to be against one side of the fixed blade opposite to the seat to shield the edge of the fixed blade. Therefore, when the user operates the bag neck sealer, the user&#39;s fingers can be protected from the fixed blade through the protective piece, preventing the fingers from being hurt so as to enhance the safety of the bag neck sealer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a conventional bag neck sealer; 
         FIG. 2  is a perspective view according to a preferred embodiment of the present invention; 
         FIG. 3  is a cross-sectional view according to the preferred embodiment of the present invention; 
         FIG. 4  is an exploded view of a fixed blade unit according to the preferred embodiment of the present invention; 
         FIG. 5  is a cross-sectional view of the fixed blade unit according to the preferred embodiment of the present invention; 
         FIG. 6  is a schematic view showing the preferred embodiment of the present invention when in use; and 
         FIG. 7  is a schematic view to show the operation of the preferred embodiment of the present invention when in use. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
     As shown in  FIG. 1  to  FIG. 5 , a bag neck sealer  100  according to a preferred embodiment of the present invention comprises a base  10 , an installation wheel  20 , a press plate  30 , a rotary wheel  40 , a movable blade unit  50 , and a fixed blade unit  60 . 
     The base  10  comprises two standing plates  11  each having a fixing trough  12  and a guide trough  13  at an upper portion thereof. 
     The installation wheel  20  has a pair of pivots  21  protruding from two sides thereof. The installation wheel  20  is pivotally connected in the fixing troughs  12  of the two standing plates  11  of the base  10 . 
     The press plate  30  is disposed between the two standing plates  11  and located close to the guide troughs  13  of the two standing plates  11 . The press plate  30  has a stay portion  31  at one end thereof close to the guide troughs  13  of the two standing plates  11 . 
     The rotary wheel  40  is pivotally connected between the two standing plates  11  and located close to the guide troughs  13  of the two standing plates  11 . The rotary wheel  40  has a plurality of interlaced troughs  41  and slots  42  thereon. 
     The movable blade unit  50  is pivotally connected between the two standing plates  11 , and comprises a movable seat  51 , a moveable blade  52  and a spring  53 . The movable seat  51  is pivoted close to the guide troughs  13  of the two standing plates  11 . The movable seat  51  has a driving portion  511  at one end thereof. The driving portion  511  passes through the guide troughs  13  of the two standing plates  11 . The movable seat  51  has a fixing portion  512  at another end thereof. The movable blade  52  is fixed on the fixing portion  512 . One end of the movable blade  52  is connected to one end of the spring  53 . Another end of the spring  53  is further connected to the base  10 . 
     The fixed blade unit  60  is disposed on one side of the base  10  and located close to the guide troughs  13  of the two standing plates  11 . The fixed blade unit  60  comprises a seat  61 , a fixed blade  62 , a protective piece  63 , an elastic member  64  and a lid  65 . 
     The seat  61  has a cutting slot  611  corresponding to the guide troughs  13  of the two standing plates  11 . The seat  61  has a chamber  612  facing the side of the base  10 . The seat  61  further comprises two positioning posts  613 , a connecting post  614 , a fixing post  615  and a raised ring  616  which are disposed in the chamber  612 . 
     The fixed blade  62  is disposed in the chamber  612  of the seat  61 . The fixed blade  62  has positioning holes  621  corresponding to the positioning posts  613  of the seat  61  to be positioned on the positioning posts  613 . The fixed blade  62  has an edge  622  across the cutting slot  611 . 
     The protective piece  63  is made of a transparent material and disposed in the chamber  612  of the seat  61 . One end of the protective piece  63  has a connecting hole  631  corresponding to the connecting post  614  of the seat  61  to be connected on the connecting post  614 . Another end of the protective piece  63  has a limit slot  632  which is connected with the elastic member  64 , such that the protective piece  63  is against one side of the fixed blade  62  opposite to the seat  61  to shield the edge  622  of the fixed blade  62 . In this embodiment, the elastic member  64  is a torque spring fixed on the fixing post  615  of the seat  61 . Two ends of the elastic member  64  are defined as a fixed end  641  and an elastic end  642 . The fixed end  641  is fixed in the raised ring  616  of the seat  61 , and the elastic end  642  is confined in the limit slot  632  of the protective piece  63 . 
     The lid  65  is to cover one side of the seat  61  opposite to the base  10 . The lid  65  has a notch  651  corresponding to the cutting slot  611  of the seat  61  to form a pair of side walls  652 . The lid  65  further has a pair of flanges  653  protruding from the pair of side walls  652  and facing the seat  61 . 
       FIG. 6  is a schematic view showing the preferred embodiment of the present invention when in use.  FIG. 7  is a schematic view to show the operation of the preferred embodiment of the present invention when in use. Before using the bag neck sealer  100 , the user has to install a roll of adhesive tape  200  on the bag neck sealer  100 . The installation wheel  20  is taken out from the base  10 , and the roll of adhesive tape  200  is installed on the installation wheel  20 , and then the installation wheel  20  is placed in the fixing troughs  12  of the two standing plates  11  again. The adhesive tape  201  is pulled out from the roll of the adhesive tape  200  and passes through the upper edge of the rotary wheel  40  to be adhered to the stay portion  31  of the press plate  30 , such that the roll of adhesive tape  200  is completely assembled. 
     After that, the user can proceed to seal a bag  300 . The open end of the bag  300  is slid into the trough  41  of the rotary wheel  40  through the guide troughs  13 . Because the adhesive tape  201  passes through the upper edge of the rotary wheel  40 , the adhesive tape  201  will be adhered on the bag  300  when the open end of the bag  300  is slid into the trough  41 . When the bag  300  is continually moved downward, the adhesive tape  201  will be wound on the bag  300  along the rotation of the rotary wheel  40  to tighten the open end of the bag  300 . When the bag  300  passes through the movable blade unit  50 , the bag  300  will bring the driving portion  511  of the movable seat  51  to turn the movable seat  51 , such that the movable blade  52  at the other end of the movable seat  51  is moved toward the rotary wheel  40  to extend into the slot  42  and to cut the adhesive tape  201 . Finally, the user moves the bag  300  toward the fixed blade unit  60 . As shown in  FIG. 7 , the bag  300  brings the protective piece  63  to turn, and then the fixed blade  62  is exposed to cut off the unnecessary portion of the bag  300  to complete the seal procedure. 
     Referring to  FIG. 5 , the protective piece  63  of the fixed blade unit  60  is against one side of the fixed blade  62  opposite to the base  10  to completely shield the edge  622  of the fixed blade  62 . Therefore, when the user operates the bag neck sealer  100 , the user&#39;s fingers can be protected from the fixed blade  62  through the protective piece  63 , preventing the fingers from being hurt so as to enhance the safety of the bag neck sealer  100 . Besides, one side of the seat  61  is provided with the lid  65  opposite to the base  10 , and the lid  65  has the flanges  653  protruding from the notch  651 . When the user operates the bag neck sealer  100 , the flanges  653  can protect the user&#39;s fingers from the fixed blade  62  to avoid any accident. Furthermore, the protective piece  63  is made of a transparent material, so the user can direct see the fixed blade  62  and check the replacement of the fixed blade  62  when operating the bag neck sealer  100 . 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.