Abstract:
The present invention discloses a decorative material rolling mill having an adjustable roll gap, which includes: a left frame and a right frame connected to each other; and an upper roll and a lower roll, two ends thereof being axially disposed on the left frame and the right frame; and a driving mechanism for driving the upper roll and the lower roll to rotate; and further includes: a rolling gap adjustment mechanism for driving the upper roll or the lower roll to move vertically along the left frame and the right frame, thereby adjusting a rolling gap between the upper roll and the lower roll according to the thickness of a shearing die. The present invention uses a rolling gap adjustment mechanism to adjust a rolling gap between an upper roll and a lower roll, thereby accommodating thickness differences among die sheets, upper rolling plates, and lower rolling plates from different manufacturers. Various rolling gap adjustment mechanisms disclosed by the present invention are simple in structure and convenient to use.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present invention relates to the technical field of rolling equipment for fabric crafts and paper crafts, and more particularly to a decorative material rolling mill having an adjustable roll gap. 
         [0003]    2. Related Art 
         [0004]    Currently, rolling mills having fixed roll spaces are used home and abroad for fabric crafts and paper crafts. To use die sheets of different thicknesses for shearing and use knurling dies of different thicknesses for knurling, rolling plates of different thicknesses require to be equipped to meet sizes specified by roll spaces of rolling mills, and rolling plates of corresponding thicknesses require to be replaced, which increases the complexity of the process. In addition, rolling mills having fixed roll spaces cannot accommodate thickness differences among die sheets and knurling dies from different manufacturers precisely, making operations inconvenient. 
       SUMMARY 
       [0005]    The technical problem to be solved by the present invention is to provide a rolling mill having an adjustable roll gap through manual shifting and a rolling mill having an automatically adjustable roll gap using a thickness measuring probe for existing deficiencies in rolling mills for existing handicrafts such as fabric crafts and paper crafts. 
         [0006]    The technical problem to be solved by the present invention is solved through the following technical solutions: 
         [0007]    A decorative material rolling mill having an adjustable roll gap includes:
       a left frame and a right frame connected to each other; and   an upper roll and a lower roll, two ends thereof being axially disposed on the left frame and the right frame; and   a driving mechanism for driving the upper roll and the lower roll to rotate; and       
 
         [0011]    The further includes: a rolling gap adjustment mechanism for driving the upper roll or the lower roll to move vertically along the left frame and the right frame, thereby adjusting a rolling gap between the upper roll and the lower roll according to the thickness of a shearing die. 
         [0012]    In a preferred embodiment of the present invention, the two ends of the upper roll or the lower roll are disposed on the left frame and the right frame through sliding blocks, and the rolling gap adjustment mechanism drives the sliding blocks to move vertically along the left frame and the right frame. 
         [0013]    In a preferred embodiment of the present invention, the driving mechanism includes: a driving small gear axially disposed on the left frame or the right frame through a driving handle shaft, a large gear located at the same side as the driving small gear and axially disposed on a shaft end at one side of the upper roll or the lower roll, and a transmission gear set axially disposed on a shaft end at a random side of the upper roll and the lower roll; and a crank handle is arranged on the driving handle shaft. 
         [0014]    In a preferred embodiment of the present invention, the rolling gap adjustment mechanism includes:
       slope block protruding openings arranged at upper portions or lower portions of the left frame and the right frame;   passive slopes arranged at top portions or bottom portions of the sliding blocks at the two ends of the upper roll or the lower roll;   a guide rail plate connected between top portions or bottom portions of the left frame and the right frame;   a dual-joint slope block arranged on a bottom surface or a top surface of the guide rail plate and horizontally movable along the guide rail plate, two ends of the dual-joint slope block protruding from the slope block protruding openings at the upper portions or the lower portions of the left frame and the right frame; active slopes fitting the passive slopes at the top portions or the bottom portions of the sliding blocks at the two ends of the upper roll or the lower roll being arranged on bottom surfaces or top surfaces of the two ends of the dual-joint slope block, where the dual-joint slope block and the guide rail plate form a first movement set, and the active slopes and the passive slopes form second movement sets; and   a movement handle arranged on the dual-joint slope block.       
 
         [0020]    In a preferred embodiment of the present invention, a guide rail groove is arranged on the guide rail plate along the length direction of the guide rail plate; a sliding key and a pair of trench plates are arranged inside the guide rail groove, the sliding key is connected to the dual-joint slope block, the pair of trench plates is arranged at two sides of the sliding key; a radial positioning hole is provided on the sliding key, a pair of positioning steel balls and a positioning spring are arranged inside the radial positioning hole, the positioning spring is arranged between the pair of steel balls; several positioning trenches or positioning holes are provided at an interval on one trench plate, and one positioning steel ball is pressed inside one random positioning trench or positioning hole under the effect of the positioning spring, so as to position the dual-joint slope block. 
         [0021]    In a preferred embodiment of the present invention, horizontal stops are disposed at middle portions of the left frame and the right frame, and sliding block reset springs are disposed between bottom surfaces or top surfaces of the sliding blocks and the horizontal stops. 
         [0022]    In a preferred embodiment of the present invention, the active slopes and the passive slopes are both stepped slopes. 
         [0023]    In a preferred embodiment of the present invention, the active slope and the passive slopes connected in a slideable manner by adopting a structure of a T-shaped groove and a T-shaped guide rail being inserted to each other. 
         [0024]    In a preferred embodiment of the present invention, a screw hole is provided at the left end or the right end of the dual joint slope block, a bolt support portion is disposed on the left frame or the right frame, a radially rotatable but axially-constrained screw rod is arranged on the bolt support portion, and the screw rod is screwed inside the screw hole. 
         [0025]    In a preferred embodiment of the present invention, the rolling gap adjustment mechanism includes:
       a pair of cams disposed inside the upper portions or the lower portions of the left frame and the right frame, the pair of cams contacting top portions or the bottom portions of the sliding blocks at the two ends of the upper roll or the lower roll;   a cam shaft connecting the pair of cams, the cam shaft being axially supported on the left frame or the right frame and extending from the left frame or the right frame;   a crank handle arranged on a shaft end of the cam shaft extending from the left frame or the right frame; and   horizontal stops disposed at middle portions of the left frame and the right frame, sliding block reset springs being disposed between bottom surfaces or top surfaces of the sliding blocks and the horizontal stops.       
 
         [0030]    In a preferred embodiment of the present invention, the rolling gap adjustment mechanism includes:
       screw holes arranged inside the sliding blocks at the two ends of the upper roll or the lower roll;   a screw rod screwed in each screw hole, a worm gear being arranged in each screw rod;   a dual-joint worm axially disposed on the left frame and the right frame, worm segments being synchronously engaged with two worm gears being disposed on the dual-joint worm; and one end of the dual-joint worm extending from the left frame or the right frame; and   a crank handle arranged on a shaft end of the dual-joint worm extending from the left frame or the right frame.       
 
         [0035]    In a preferred embodiment of the present invention, the rolling gap adjustment mechanism includes:
       frame slopes arranged inside top portions of the left frame and the right frame;   upper connecting plates fixed on the top portions of the left frame and the right frame;   positioning guide rails fixed at middle positions of the upper connecting plates, inclined angles of the positioning guide rails being consistent with angles of the frame slopes;   guide rail cover plates fixed at two ends of the positioning guide rails;   a dual-joint slope block, two ends of the dual-joint slope block extending between the top surfaces of the sliding blocks at the two ends of the upper roll and the frame slopes, passive slopes fitting the frame slopes being arranged at top portions of the two ends of the dual-joint slope block, the frame slopes and the passive slopes forming movement sets, sliding block acting portions being arranged at bottom portions of two ends of the dual joint slope block, and the sliding block acting portions acting on the sliding blocks;   a positioning sliding block inserted inside the positioning guide rails being fixedly disposed at a middle position of the dual-joint slope block, one end of the positioning sliding block coming out from one guide rail cover plate, and a positioning guide rail reset spring being arranged between the other end of the positioning sliding block and the other guide rail cover plate; and   a probe installed on the part of the positioning sliding block coming out from the guide rail cover plate through a radial fixation screw and an axial adjustment screw, the probe being located above a rolling workbench.       
 
         [0043]    In a preferred embodiment of the present invention, the left frame is formed of a left front support and a left rear support, and right frame is formed of a right front support and a right rear support. 
         [0044]    In a preferred implementation of the present invention, the left front support, the left rear support, the right front support, and the right rear support are formed by adopting a casting forming method along an aperture. 
         [0045]    By adopting the foregoing technical solutions, the present invention uses a rolling gap adjustment mechanism to adjust a rolling gap between an upper roll and a lower roll, thereby accommodating thickness differences among die sheets, upper rolling plates, and lower rolling plates from different manufacturers. Various rolling gap adjustment mechanisms disclosed by the present invention are simple in structure and convenient to use. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0046]    The present disclosure will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present disclosure, and wherein: 
           [0047]      FIG. 1  is a schematic structural view of Embodiment 1 of the present invention; 
           [0048]      FIG. 2  is a top view of  FIG. 1 ; 
           [0049]      FIG. 3  is a view along A-A in  FIG. 1 ; 
           [0050]      FIG. 4  is an enlarged schematic view of B in  FIG. 3 ; 
           [0051]      FIG. 5  is a schematic view of a work state when a rolling gap between an upper roll and a lower roll is minimal according to Embodiment 1 of the present invention; 
           [0052]      FIG. 6  is a schematic view of a work state when a rolling gap between an upper roll and a lower roll is maximal according to Embodiment 1 of the present invention; 
           [0053]      FIG. 7  is a schematic view of a work state when a rolling gap between an upper roll and a lower roll is minimal according to Embodiment 2 of the present invention; 
           [0054]      FIG. 8  is a schematic view of a work state when a rolling gap between an upper roll and a lower roll is maximal according to Embodiment 2 of the present invention; 
           [0055]      FIG. 9  is a schematic view of a work state when a rolling gap between an upper roll and a lower roll is minimal according to Embodiment 3 of the present invention; 
           [0056]      FIG. 10  is a schematic view of a work state when a rolling gap between an upper roll and a lower roll is maximal according to Embodiment 3 of the present invention; 
           [0057]      FIG. 11  is a schematic structural view of Embodiment 4 of the present invention; 
           [0058]      FIG. 12  is a schematic structural view of Embodiment 5 of the present invention; 
           [0059]      FIG. 13  is a view along A-A in  FIG. 12 ; 
           [0060]      FIG. 14  is a schematic structural view of Embodiment 6 of the present invention; 
           [0061]      FIG. 15  is a view along A-A in  FIG. 14 ; 
           [0062]      FIG. 16  is a schematic structural view of Embodiment 6 of the present invention; 
           [0063]      FIG. 17  is a view along A-A in  FIG. 16 ; 
           [0064]      FIG. 18  is a schematic structural view of Embodiment 7 of the present invention; 
           [0065]      FIG. 19  is a left view of  FIG. 18 ; 
           [0066]      FIG. 20  is a sectional view along A-A in  FIG. 18 ; and 
           [0067]      FIG. 21  is a sectional view along B-B in  FIG. 18 . 
       
    
    
     DETAILED DESCRIPTION 
       [0068]    The present invention is further described below with reference to the accompanying drawings and specific implementation manners. 
       Embodiment 1 
       [0069]    Refer to  FIG. 1  to  FIG. 4 . A decorative material rolling mill having an adjustable roll gap shown in the drawings includes a left frame  100  and a right frame  100   a . The left frame  100  is formed of a left front support  110  and a left rear support  120 . The right frame  100   a  is formed of a right front support  110   a  and a right rear support  120   a.    
         [0070]    Bottom portions of the left frame  100  and the right frame  100   a  are connected through a lower connecting plate  130 . In connecting, the lower connecting plate  130  further connects the left front support  110  and the left rear support  120  and connects the right front support  110   a  and the right rear support  120   a  through a fastening bolt. 
         [0071]    Top portions of the left frame  100  and the right frame  100   a  are connected through a guide rail plate  140 . In connecting, the guide rail plate  140  further connects the left front support  110  and the left rear support  120  and connects the right front support  110   a  and the right rear support  120   a  through a fastening bolt. 
         [0072]    When being connected adopting the foregoing manner, the left frame  100 , the right frame  100   a , the lower connecting plate  130 , and the guide rail plate  140  form a rectangular frame. 
         [0073]    The decorative material rolling mill having an adjustable roll gap depends on a pair of rolls to work. The pair of rolls includes an upper roll  210  and a lower roll  220 . The lower roll  220  is supported on lower portions of the left frame  100  and the right frame  100   a  through a pair of ball bearings  221 ,  221   a , that is, supported on lower portions of the left front support  110  and the left rear support  120  and lower portions of the right front support  110   a  and the right rear support  120   a.    
         [0074]    A left horizontal stop  150  is connected between middle portions of the left front support  110  and the left rear support  120 . A right horizontal stop  150   a  is connected between middle portions of the right front support  110   a  and the right rear support  120   a . A sliding cavity  160  for a sliding block to slide vertically is formed in the space located above the horizontal stop  150  of the left front support  110  and the left rear support  120 . A sliding cavity  160   a  for a sliding block to slide vertically is formed in the space located above the horizontal stop  150   a  of the right front support  110   a  and the right rear support  120   a.    
         [0075]    Sliding blocks  230 ,  230   a  are placed inside the sliding cavities  160 ,  160   a , respectively. Sliding block reset springs  240 ,  240   a  are disposed between bottom surfaces of sliding blocks  230  and  230   a  and the horizontal stops  150 ,  150   a . Top surfaces of the sliding blocks  230 ,  230   a  are passive slopes  231 ,  231   a  with the same inclined angle and parallel to each other. 
         [0076]    Two ends of the upper roll  210  are supported on the sliding blocks  230 ,  230   a  through needle roller bearings  211 ,  211   a , respectively. 
         [0077]    The rotation of the upper roll  210  and the lower roll  220  depends on a driving mechanism. The driving mechanism includes a small gear  310 , a large gear  320 , an active gear  330 , and a passive gear  340 . The active gear  330  and the passive gear  340  are installed on left shaft ends of the lower roll  220  and the upper roll  210 , respectively, and are engaged with each other. The large gear  320  is installed on a right shaft end of the lower roll  220 . 
         [0078]    A protruding handle shaft bearing seat  121   a  is disposed on the right front support  120   a . A handle shaft  350  is supported on the handle shaft bearing seat  121   a  through a needle roller bearing  360 . A bearing cover (not shown) is installed on the handle shaft bearing seat  121   a  through a fastening screw. The small gear  310  is disposed at an inner end of the handle shaft  350  through a key. A crank handle (not shown) is installed at an inner end of the handle shaft  350 . The crank handle rotates to drive the handle shaft  350  to rotate. Also, the crank handle drives the small gear  310  to rotate. Through the engagement between the small gear  310  and the large gear  320 , the small gear  310  drives the large gear  320  to rotate at a lower speed. The rotation of the large gear  320  also drives the lower roll  220  to rotate. The lower roll  220  rotates to further drive the active gear  330  to rotate. The upper roll  210  is driven to rotate through a transmission set formed of the active gear  330  and the passive gear  340  being engaged with each other. Rolling is accomplished with the rotation of the upper roll  210  and the lower roll  220 . 
         [0079]    To accommodate thickness differences among die sheets and knurling dies from different manufacturers, this embodiment uses a rolling gap adjustment mechanism to adjust the rolling gap between the upper roll  210  and the lower roll  220 . 
         [0080]    The rolling gap adjustment mechanism in the embodiment includes a dual-joint slope block  400  installed on a bottom portion of the guide rail plate  140 . The dual-joint slope block  400  and the guide rail plate  140  form a first movement set, and slope block protruding openings  111 ,  111   a  are provided at upper portions of the left frame  100  and the right frame  100   a . When the dual-joint slope block  400  moves horizontally along the guide rail plate  140 , two ends of the dual-joint slope block  400  can extend from the slope block protruding openings  111 ,  111   a.    
         [0081]    Active slopes  410 ,  410   a  fitting passive slopes  231 ,  231   a  of the sliding blocks  230 ,  230   a  are arranged on bottom surfaces of the two ends of the dual-joint slope block  400 . The active slopes  410 ,  410   a  and the passive slopes  231 ,  231   a  form second movement sets. Further, a movement handle  420  is disposed on the dual-joint slope block  400 . By means of the movement handle  420 , the dual-joint slope block  400  can move horizontally. Through the second movement sets formed of the active slopes  410 ,  410   a  and the passive slopes  231 ,  231   a , the horizontal movement of the dual-joint slope block  400  is converted into vertical movement of the sliding blocks  230 ,  230   a . The vertical movement of the sliding blocks  230 ,  230   a  drives the upper roll  210  to move vertically relative to the lower roll  220 , so as to adjust the rolling gap between the upper roll  210  and the lower roll  220 . 
         [0082]    To perform shift adjustment for the rolling gap between the upper roll  210  and the lower roll  220 , in this embodiment, a guide rail groove  141  arranged along the length direction of the guide rail plate  140  is provided on the guide rail plate  140 . A sliding key  420  and a pair of trench plates  430 ,  430   a  are arranged inside the guide rail groove  141 . The sliding key  420  is connected to the dual-joint slope block  400 . The pair of trench plates  430 ,  430   a  is arranged at two sides of the sliding key  420 . 
         [0083]    A radial positioning hole  421  is provided on the sliding key  420 . A pair of positioning steel balls  440 ,  440   a  and a positioning spring  450  are arranged inside the radial positioning hole  421 . The positioning spring  450  is arranged between the pair of steel balls  440 ,  440   a . Several positioning trenches  431  are provided at an interval on the trench plate  450  (certainly several positioning holes may also be provided), so as to form a plurality of shifts. The adjustment amount of the rolling gap between the upper roll  210  and the lower roll  220  each time depends on the space between two adjacent positioning trenches  431 . 
         [0084]    When the sliding key  420  moves, the positioning steel ball  440  is pressed into one random positioning trench  431  under the effect of the positioning spring  450 , so as to position the dual-joint slope block  400 , thereby ensuring the stability of the dual-joint slope block  400  at a new position and ensuring desirable handgrip of the dual-joint slope block  400  in the movement process. 
         [0085]    The working principle of the foregoing rolling gap adjustment mechanism is as follows: Refer to  FIG. 5 . When the dual-joint slope block  400  moves to the left to a limit position, the active slope  410   a  at the left end of the dual joint slope block  400  fits the passive slope  231   a  of the sliding block  230   a , so as to press the sliding block  230   a  to the lowest position. Also, the active slope  410  at the right end of the dual-joint slope block  400  fits the passive slope  231  of the sliding block  230 , so as to press the sliding block  230  to the lowest position. At this time, the rolling gap H between the upper roll  210  and the lower roll  220  becomes minimal. An upper rolling plate  510 , a lower rolling plate  520 , a die sheet  530 , and a paper craft card  540  are stacked to pass between the upper roll  210  and the lower roll  220 , so that the die sheet  530  presses a pattern on a paper craft card  540 . 
         [0086]    Refer to  FIG. 6 . When the dual-joint slope block  400  moves to the right to a limit position, the active slope  410   a  at the left end of the dual-joint slope block  400  leaves the passive slope  231   a  of the sliding block  230   a . The sliding block  230   a  rises to the highest position on the sliding block reset spring. Also, the active slope  410  at the left end of the dual joint slope block  400  leaves the passive slope  231  of the sliding block  230 . The sliding block  230  rises to the highest position on the sliding block reset spring. At this time, the rolling gap H′ between the upper roll  210  and the lower roll  220  becomes maximal. 
       Embodiment 2 
       [0087]    Refer to  FIG. 7  and  FIG. 8 . In this embodiment, the guide rail plate is installed at bottom portions of the left frame  100  and the right frame  100   a . The dual joint slope block  400  is installed on the top surface of the guide rail plate. A sliding cavity  160  for the sliding blocks  230 ,  230   a  to slide vertically is formed in the space located below the horizontal stop of the left front support and the left rear support. A sliding cavity  160 ,  160   a  for the sliding block to slide vertically is formed in the space located below the horizontal stop of the right front support and the right rear support. The two ends of the lower roll  220  are supported on the sliding blocks  230 ,  230   a  through needle roller bearings, respectively. The upper roll  220  is supported on the upper portions of the left frame  100  and the right frame  100   a  through a pair of ball bearings, that is, supported on the upper portions of the left front support and the left rear support and on the upper portions of the right front support and the right rear support. 
         [0088]    Sliding block reset springs are disposed between top surfaces of the sliding blocks  230 ,  230   a  and the horizontal stop. The bottom surfaces of the sliding blocks  230 ,  230   a  are passive slopes  231 ,  231   a  with the same inclined angle and parallel to each other. Active slopes  410 ,  410   a  fitting the passive slopes  231 ,  231   a  of the sliding blocks  230 ,  230   a  are arranged on the top surfaces of the two ends of the dual-joint slope block  400 . The working principle is basically the same as that in Embodiment 1. 
       Embodiment 3 
       [0089]    This embodiment is basically the same as Embodiment 1. Refer to  FIG. 9  and  FIG. 10 . The passive slopes  231 ,  231   a  of the sliding blocks  230 ,  230   a  are changed to stepped passive slopes  231 ′,  231   a ′, and the active slopes  410 ,  410   a  at two ends of the dual-joint slope block  400  are changed to stepped active slopes  410 ′,  410   a′.    
         [0090]    Refer to  FIG. 9 . When the dual-joint slope block  400  moves to the left to a limit position, the stepped active slope  410   a ′ at the left end of the dual-joint slope block  400  fits the stepped passive slope  231   a ′ of the sliding block  230   a , so as to press the sliding block  230   a  to the lowest position. Also, the stepped active slope  410  at the right end of the dual-joint slope block  400  fits the stepped passive slope  231 ′ of the sliding block  230 , so as to press the sliding block  230  to the lowest position. At this time, the rolling gap H between the upper roll  210  and the lower roll  220  becomes minimal. The upper rolling plate  510 , the lower rolling plate  520 , the die sheet  530 , and the paper craft card  540  are stacked to pass between the upper roll  210  and the lower roll  220 , so that the die sheet  530  presses a pattern on the paper craft card  540 . 
         [0091]    Refer to  FIG. 10 . When the dual-joint slope block  400  moves to the right to a limit position, the stepped active slope  410   a ′ at the left end of the dual-joint slope block  400  leaves the stepped passive slope  231   a ′ of the sliding block  230   a , the sliding block  230   a  rises to the highest position on the sliding block reset spring. Also, the stepped active slope  410 ′ at the left end of the dual-joint slope block  400  leaves the stepped passive slope  231 ′ of the sliding block  230 . The sliding block  230  rises to the highest position on the sliding block reset spring. At this time, the rolling gap H′ between the upper roll  210  and the lower roll  220  becomes maximal. 
       Embodiment 4 
       [0092]    This embodiment and Embodiment 1 are basically the same in structure. This embodiment is different from Embodiment 1 in that: Refer to  FIG. 11 . A screw hole  142  is provided at the left end of the dual-joint slope block  140 . A bolt support portion  112  is disposed on the left frame  100 . A radially rotatable but axially-constrained screw rod  113  is arranged on the bolt support portion  112 . The screw rod  113  is screwed inside the screw hole  142 . The screw rod  113  rotates to drive the dual-joint slope block  140  to move horizontally, so as to drive the sliding blocks  230 ,  230   a  to move vertically, thereby adjusting the rolling gap between the upper roll  210  and the lower roll  220 . 
       Embodiment 5 
       [0093]    This embodiment is basically the same as Embodiment 1 in structure. This embodiment is different from Embodiment 1 in that: Refer to  FIG. 12  and  FIG. 13 , the sliding block reset springs  240 ,  240   a  are omitted, and the passive slopes  231 ,  231   a  of the sliding blocks  230 ,  230   a  are changed to T-shaped guide rail passive slopes  231 ″,  231   a ″, the active slopes  410 ,  410   a  at two ends of the dual-joint slope block  400  are changed to T-shaped groove active slopes  410 ″,  410   a ″. The T-shaped guide rail passive slopes  231 ″,  231   a ″ are inserted in the T-shaped groove active slopes  410 ″,  410   a ″, respectively. 
         [0094]    In addition, a screw hole  142  is provided at the left end of the dual-joint slope block  140 . A bolt support portion  112  is disposed on the left frame  100 . A radially rotatable but axially-constrained screw rod  113  is arranged on the bolt support portion  112 . The screw rod  113  is screwed inside the screw hole  142 . The screw rod  113  rotates to drive the dual-joint slope block  140  to move horizontally, so as to drive the sliding blocks  230 ,  230   a  to move vertically, thereby adjusting the rolling gap between the upper roll  210  and the lower roll  220 . 
       Embodiment 6 
       [0095]    This embodiment is different from Embodiment 1 in the rolling gap adjustment mechanism. Refer to  FIG. 14  and  FIG. 15 . The rolling gap adjustment mechanism is formed by adopting a pair of cams  610 ,  610   a  and a cam shaft  620 . The top surfaces of the sliding blocks  230 ,  230   a  are planes. 
         [0096]    The top portions of the left frame  100  and the right frame  100   a  are connected through an upper connecting plate  140   a . The decorative material rolling mill having an adjustable roll gap depends on a pair of rolls to work. The pair of rolls includes an upper roll  210  and a lower roll  220 . The lower roll  220  is supported on the lower portions of the left frame  100  and the right frame  100   a  through a pair of ball bearings  221 ,  221   a.    
         [0097]    A left horizontal stop  150  is disposed at the middle portion of the left support  100 . A right horizontal stop  150   a  is disposed at the middle portion of the right support  100   a . A sliding cavity  160  for the sliding block to slide vertically is formed in the space located above the horizontal stop  150  of the left support  100 . A sliding cavity  160   a  for the sliding block to slide vertically is formed in the space located above the horizontal stop  150   a  of the right support  100   a.    
         [0098]    Sliding blocks  230 ,  230   a  are placed inside the sliding cavities  160 ,  160   a , respectively. Sliding block reset springs  240 ,  240   a  are disposed between the bottom surfaces of the sliding blocks  230 ,  230   a  and the horizontal stops  150 ,  150   a . The top surfaces of the sliding blocks  230 ,  230   a  are planes. 
         [0099]    The two ends of the upper roll  210  are supported on the sliding blocks  230 ,  230   a  through needle roller bearings  211 ,  211   a , respectively. 
         [0100]    A pair of cams  610 ,  610   a  is arranged inside the sliding cavities  160 ,  160   a  and contacts the top surfaces of the sliding blocks  230 ,  230   a . A cam shaft  620  is axially supported on the left frame  100  and extends from the left frame  100 . Two ends of the cam shaft  620  and the pair of cams  610 ,  610   a  are connected through a key. A crank handle (not shown) is arranged on the shaft end of the cam shaft extending from the left frame  100 . 
         [0101]    The crank handle rotates to drive the cam shaft  620  to rotate. The pair of cams  610 ,  610   a  acts on the sliding blocks  230 ,  230   a , respectively, to drive the sliding blocks  230 ,  230   a  to move downward. The upward movement of the sliding blocks  230 ,  230   a  is implemented depending on the sliding block reset springs  240 ,  240   a . The rest structures of this embodiment are the same as those in Embodiment 1. The working principle of rolling is also the same as that in Embodiment 1. 
       Embodiment 7 
       [0102]    This embodiment is different from Embodiment 1 in the rolling gap adjustment mechanism. Refer to  FIG. 16  and  FIG. 17 . The rolling gap adjustment mechanism is formed by adopting a pair of screw rods  630 ,  630   a , worm gears  631 ,  631   a  arranged on the pair of screw rods  630 ,  630   a , and a dual-joint worm  640 . Also, the sliding block reset springs  240 ,  240   a  are omitted, and screw holes  232 ,  232   a  are provided on the sliding blocks  230 ,  230   a.    
         [0103]    The top portions of the left frame  100  and the right frame  100   a  are connected through an upper connecting plate  140   a . The decorative material rolling mill having an adjustable roll gap depends on a pair of rolls to work. The pair of rolls includes an upper roll  210  and a lower roll  220 . The lower roll  220  is supported on the lower portions of the left frame  100  and right frame  100   a  through a pair of ball bearings  221 ,  221   a.    
         [0104]    A left horizontal stop  150  is disposed at the middle portion of the left support  100 . A right horizontal stop  150   a  is disposed at the middle portion of the right support  100   a . A sliding cavity  160  for the sliding block to slide vertically is formed in the space located above the horizontal stop  150  of the left support  100 . A sliding cavity  160   a  for the sliding block to slide vertically is formed in the space located above the horizontal stop  150   a  of the right support  100   a.    
         [0105]    Sliding blocks  230 ,  230   a  are placed inside the sliding cavities  160 ,  160   a , respectively. The two ends of the upper roll  210  are supported on the sliding blocks  230 ,  230   a  through needle roller bearings  211 ,  211   a , respectively. 
         [0106]    A pair of screw rods  630 ,  630   a  is arranged inside the sliding cavities  160 ,  160   a  and is in threaded connection to the screw holes  232 ,  232   a  inside the sliding blocks  230 ,  230   a . The dual-joint worm  640  is axially supported on the left frame  100  and extends from the left frame  100 . Worm segments  641 ,  641   a  are disposed at the two ends of the dual-joint worm  640 . The worm segments  641 ,  641   a  are engaged with the worm gears  631 ,  631   a , respectively. A crank handle (not shown) is arranged on the shaft end of the dual-joint worm  640  extending from the left frame  100 . 
         [0107]    The crank handle rotates to drive the dual-joint worm  640  to rotate. The rotation of the dual-joint worm  640  drives the worm segments  641 ,  641   a  to rotate. Through the engagement between the worm segments  641 ,  641   a  and the worm gears  631 ,  631   a , the worm gears  631 ,  631   a  are driven to rotate. The worm gears  631 ,  631   a  then drive the screw rods  630 ,  630   a  to rotate. The screw rods  630 ,  630   a  drive the sliding blocks  230 ,  230   a  to move vertically to implement the adjustment of the rolling gap between the upper roll  210  and the lower roll  220 . The working principle of rolling is also the same as that in Embodiment 1. 
       Embodiment 8 
       [0108]    Refer to  FIG. 18  to  FIG. 21 . The decorative material rolling mill having an adjustable roll gap given in the drawings includes a left frame  100  and a right frame  100   a . The left frame  100  is formed of a left front support  110  and a left rear support  120 . The right frame  100   a  is formed of a right front support  110   a  and a right rear support  120   a.    
         [0109]    Bottom portions of the left frame  100  and the right frame  100   a  are connected through a lower connecting plate  130 . In connecting, the lower connecting plate  130  further connects the left front support  110  and the left rear support  120  and connects the right front support  110   a  and the right rear support  120   a  through a fastening bolt. 
         [0110]    Top portions of the left frame  100  and the right frame  100   a  are connected through an upper connecting plate  140   b . In connecting, the upper connecting plate  140   b  further connects the left front support  110  and the left rear support  120  and connects the right front support  110   a  and the right rear support  120   a  through a fastening bolt. 
         [0111]    When being connected adopting the foregoing manner, the left frame  100 , the right frame  100   a , the lower connecting plate  130 , and the upper connecting plate  140   b  form a rectangular frame. 
         [0112]    The decorative material rolling mill having an adjustable roll gap depends on a pair of rolls to work. The pair of rolls includes an upper roll  210  and a lower roll  220 . The lower roll  220  is supported on lower portions of the left frame  100  and the right frame  100   a  through a pair of ball bearings  221 ,  221   a , that is, supported on the lower portions of the left front support  110  and the left rear support  120  and the lower portions of the right front support  110   a  and the right rear support  120   a.    
         [0113]    A left horizontal stop  150  is connected between middle portions of the left front support  110  and the left rear support  120 . A right horizontal stop  150   a  is connected between the middle portions of the right front support  110   a  and the right rear support  120   a . A sliding cavity  160  for the sliding block to slide vertically is formed in the space located above the horizontal stop  150  of the left front support  110  and the left rear support  120 . A sliding cavity  160   a  for the sliding block to slide vertically is formed in the space located above the horizontal stop  150   a  of the right front support  110   a  and the right rear support  120   a.    
         [0114]    Sliding blocks  230 ,  230   a  are placed inside the sliding cavities  160 ,  160   a , respectively, and top surfaces of the sliding blocks  230 ,  230   a  are planes. 
         [0115]    Two ends of the upper roll  210  are supported on the sliding blocks  230 ,  230   a  through needle roller bearings  211 ,  211   a , respectively. 
         [0116]    The rotation of the upper roll  210  and the lower roll  220  depends on a driving mechanism. The driving mechanism includes a small gear  310 , a large gear  320 , an active gear  330 , and a passive gear  340 . The active gear  330  and the passive gear  340  are installed on left shaft ends of the lower roll  220  and the upper roll  210 , respectively, and are engaged with each other. The large gear  320  is installed on a right shaft end of the lower roll  220 . 
         [0117]    A protruding handle shaft bearing seat  121   a  is disposed on the right front support  120   a . The handle shaft  350  is supported on the handle shaft bearing seat  121   a  through a needle roller bearing  360 . A bearing cover (not shown) is installed on the handle shaft bearing seat  121   a  through a fastening screw. The small gear  310  is disposed at an inner end of the handle shaft  350  through a key. A crank handle (not shown) is installed at an outer end of the handle shaft  350 . The crank handle rotates to drive the handle shaft  350  to rotate. The crank handle also drives the small gear  310  to rotate. Through the engagement between the small gear  310  and the large gear  320 , the small gear  310  drives the large gear  320  to rotate at a lower speed. The rotation of the large gear  320  also drives the lower roll  220  to rotate. The rotation of the lower roll  220  also drives the active gear  330  to rotate. The upper roll  210  is driven to rotate through a transmission set formed of the active gear  330  and the passive gear  340  being engaged with each other. Rolling is accomplished with the rotation of the upper roll  210  and the lower roll  220 . 
         [0118]    To accommodate thickness differences among die sheets and knurling dies from different manufacturers, this embodiment uses a rolling gap adjustment mechanism to adjust the rolling gap between the upper roll  210  and the lower roll  220 . 
         [0119]    The rolling gap adjustment mechanism in this embodiment includes frame slopes  113 ,  113   a  arranged inside top portions of the left frame  100  and the right frame  100   a  and a positioning guide rail  710  fixed at the middle position of the upper connecting plate  140   b . The inclined angle of the positioning guide rail  710  is consistent with the angle of the frame slope. Guide rail cover plates  711 ,  711   a  are fixedly installed at two ends of the positioning guide rail  710 . 
         [0120]    A dual-joint slope block  720  is installed below the upper connecting plate  140   b . Two ends of the dual-joint slope block  720  extend between top surfaces of the sliding blocks  230 ,  230   a  at the two ends of the upper roll  210  and the frame slopes  113 ,  113   a . Passive slopes  721 ,  721   a  fitting the frame slopes  113 ,  113   a  are arranged at the top portions of the two ends of the dual-joint slope block  720 . The frame slopes  113 ,  113   a  and the passive slopes  721 ,  721   a  form movement sets. Sliding block acting portions  722 ,  722   a  are arranged at the bottom portions of the two ends of the dual-joint slope block  720 . The sliding block acting portions  722 ,  722   a  act on the sliding blocks  230 ,  230   a.    
         [0121]    A positioning sliding block  730  inserted inside the positioning guide rail  710  is disposed at the middle position of the dual-joint slope block  720 . One end of the positioning sliding block  730  comes out from the guide rail cover plate  711   a . A positioning guide rail reset spring  740  is arranged between the other end of the positioning sliding block  730  and the guide rail cover plate  711 . 
         [0122]    A probe  770  is installed through a radial fixation screw  760  and an axial adjustment screw  750  on the part of the positioning sliding block  730  coming from the guide rail cover plate  711   a . The probe  770  is located above the rolling workbench  800 . The specific installation manner is as follows: A radial screw hole  731  is provided on the part of the positioning sliding block  730  coming from the guide rail cover plate  711   a . The radial fixation screw  760  passes through a waist-shaped hole  771  on the probe  770  to be screwed inside the radial screw hole  731 . The object of disposing waist-shaped hole  771  is mainly to facilitate the adjustment of the height of the probe  770 , and also compensate for the abrasion of the probe  770 . An axial through hole  141   b  is provided on the upper connecting plate  140   b . An axial screw hole  732  is provided on the part of the positioning sliding block  730  coming from the guide rail cover plate  711   a . The axial adjustment screw  750  passes through the axial through hole  141   b  and is screwed through the axial screw hole  732  to press the top surface of the probe  770 . The height of the probe  770  can be adjusted through the axial adjustment screw  750 . 
         [0123]    Refer to  FIG. 18  to  FIG. 21 . First, the paper craft card  540  to be sheared is placed on the lower rolling plate  520 . The die sheet  530  is placed on the paper craft card  540 . The rolling plate  510  is placed on the die sheet  530  to form the shearing die  500 . The shearing die  500  is pushed into the workbench  800 . When the shearing die  500  is higher than the bottom portion of the probe  770 , the probe  770  moves forward and upward as being pushed by the shearing die  500 . The risen probe  770  pushes the positioning sliding block  730  to move upward along the positioning guide rail  710  and drives the dual joint slope block  720  to move upward along the frame slopes  113 ,  113   a  inside the top portions of the left frame  100  and the right frame  100   a , so as to produce gaps between the sliding blocks  230 ,  230   a  and the sliding block acting portions  722 ,  722   a  at the two ends of the dual-joint slope block  720 . The shearing die  500  continues to move between the upper roll  210  and the lower roll  220  to push up the upper roll  210 , so that the shearing die  500  goes between the upper roll  210  and the lower roll  220 . The top surfaces of the sliding blocks  230 ,  230   a  are held against the bottom surfaces of the sliding block acting portions  722 ,  722   a  at the two ends of the dual-joint slope block  720 . 
         [0124]    The crank handle rotates to drive the handle shaft  350  to rotate. The crank handle also drives the small gear  310  to rotate. Through the engagement between the small gear  310  and the large gear  320 , the small gear  310  drives the large gear  320  to rotate at a lower speed. The rotation of the large gear  320  also drives the lower roll  220  to rotate. The rotation of the lower roll  220  also drives the active gear  330  to rotate. The upper roll  210  is driven to rotate through a transmission set formed of the active gear  330  and the passive gear  340  being engaged with each other. The rotation of the upper roll  210  and the lower roll  220  drives the shearing die  500  to move forward to perform rolling on the part that requires rolling. When the rolling is finished, the shearing die  500  is pushed out. The positioning sliding block  730  and the probe  770  are reset through the positioning guide rail reset spring  740 , so as to enter a next rolling state. 
         [0125]    Compared with the prior art, the embodiment adopts two standardized rolling plates to greatly reduce the running cost. Through the measurement of a probe, an accurate roll gap is obtained between an upper roll and a lower roll, thereby significantly increasing the rolling precision, achieving a very stable rolling effect, and effectively ensuring the quality of roll die sheets, upper rolling plates and lower rolling plates. 
         [0126]    Generally, after core-drawing of a hole of a cast, an axial core-drawing tilt often exists. For a bearing hole having a high assembly precision, after casting forming, shearing process is further required. In the foregoing embodiment of the present invention, the left frame  100  includes the left front support  110  and the left rear support  120  along the center of the bearing hole. The right frame  100   a  includes the right front support  110   a  and the right rear support  120   a  along the center of the bearing hole, and the formation is achieved by adopting a forming method of casting along a bearing aperture, which eliminates the axial taper of a bearing hole, and also solves the axial positioning of the bearing and the sliding block along the roll on the frame, thereby omitting a stop ring required by axial positioning of a bearing and a guide pressing plate required by axial positioning of a sliding block. Further, the through holes for screws required for the assembly of the frame can be cast one by one. A core-drawing structure is omitted in a casting mold, thereby reduce the fabrication cost for casting molds, which reduces shearing process for metal, reduces the number of parts to form, and reduces the production cost.