Abstract:
An integrated overprint colorful seal with multiple printing surfaces, comprising a seal housing ( 1 ), a middle frame ( 2 ) accommodated in the seal housing ( 1 ), a spring ( 3 ) squeezed between the seal housing and the middle frame, a seal body ( 4 ) in a regular triangular prism or a quadrangular prism shape, and a driving mechanism. Each side surface of the seal body ( 4 ) in the regular triangular prism or quadrangular prism shape is a printing surface ( 60 ) in a different color and the printing surface is overprinted on a target object to show a colorful seal pattern. The seal integrates the multiple printing surfaces in an integral whole, can implement semi-automatic overprint of three colors or four colors and is precise in overprint. The seal also supports printing surface replacement and ink-replenishment, and is easy to use and convenient to carry.

Description:
FIELD OF THE INVENTION 
     The present application relates to a portable manual device of stenciler, and more particularly to an integrated overprint colorful seal with multiple printing surfaces. 
     BACKGROUND OF THE INVENTION 
     The seals in the prior art mostly have single style and color, and a plurality of seals with different colors and patterns have to be used for manual overprint to achieve a color pattern, which is not convenient for use, and the effect of the pattern is not good. Chinese utility model patent ZL98233914.3 titled “automatic flip seal” discloses an automatic flip seal, comprising a seal housing, a central frame disposed therein, a spring squeezed between the seal housing and the central frame, and a seal fixed in the central frame by a fixed rod. The automatic flip seal can flip automatically to be oiled, flip automatically to print, and is convenient to carrying. However, the automatic flip seal has only one printing surface and can only achieve monochrome printing function. 
     SUMMARY OF THE INVENTION 
     The technical problem to be solved by the present application is to provide an integrated overprint color seal with multiple printing surfaces which can solve the problem of monochrome printing and manual overprint, so as to overcome the defect in the prior art. 
     The present application provides the following technical solution to solve the technical problem: an integrated overprint colorful seal with multiple printing surfaces, comprising a seal housing, a middle frame accommodated in the seal housing, a spring squeezed between the seal housing and the middle frame, a seal body in a regular triangular prism or a quadrangular prism shape, and a driving mechanism; wherein each side surface of the seal body in the regular triangular prism or quadrangular prism shape is a printing surface in a different color; a fixed shaft passes through the centers of two end surface of the seal body which are parallel to each other, the two ends of the fixed shaft pass through the vertical grooves on the vertical walls at two sides of the middle frame respectively and are supported on the vertical walls at two sides of the lower portion of the seal housing, so that the seal body is suspended in the middle frame; the drive mechanism is mounted at both ends of the fixed shaft, wherein a ratchet or gear of the drive mechanism is fixed on one end surface of the seal body, and a pawl or rack which engages with the ratchet or gear to drive the seal body to rotate is fixed on the middle frame; when the seal housing is not depressed, the spring is in an extended state and the printing surface in one color of the seal body faces downwards; when the seal housing is depressed, the spring will be squeezed, the seal body will be moved downwards along the vertical grooves on the vertical walls at two sides of the middle frame with the fixed shaft until the printing surface in the one color prints on the target, when the seal housing is relaxed, the seal body will be moved upwards with the fixed shaft while the driving mechanism will drive the seal body to rotate about the axis of the fixed shaft until the printing surface of the seal body in another color faces downwards; when the seal housing is depressed again, the printing surface in another color will overprint on the existing printed pattern on the target, and so forth, colorful printed pattern will be presented on the target after the printing surfaces in three colors or four colors are overprinted. 
     The drive mechanism comprises a gear mechanism and a positioning wheel which are mounted on the two ends of the fixed shaft projecting from the central part of the seal body respectively; the gear mechanism comprises a gear and a one-way bearing, and the one-way bearing has an inner ring which is sleeved on one end of the fixed shaft slidably and is fixed on the end surface of the seal body, the gear is sleeved on the outer ring of the one-way bearing tightly and is integrated with the one-way bearing; a rack is fixed on the vertical groove wall of the vertical groove which is at the same end of the middle frame as the gear, and the gear mechanism engages with the rack; when the seal housing is depressed, the gear will rotate downwards along the rack to drive the outer ring of the one-way bearing rotate and the seal body will not rotate; when the seal housing is relaxed, the gear will move upwards along the rack and rotate, the one-way bearing will be locked and can not rotate, therefore the inner ring, the outer ring and the seal body will rotate by one-third or one quarter of the circumference; the positioning wheel is mounted on the fixed shaft at the other side of the seal body, three or four projecting ribs are distributed uniformly on a tubular outer wall of the positioning wheel, recessed positioning grooves are arranged on the end surface of the projecting ribs which faces towards the vertical wall of the seal housing, projecting positioning ribs fitting with the positioning grooves of the positioning wheel are arranged on the vertical wall of the seal housing correspondingly. 
     The gear ratio of the gear and the rack is 3:1 or 4:1 based on the shape of the seal body being a regular triangular prism or a quadrangular prism. 
     A recess fitting with the projecting ribs of the positioning wheel is formed at the bottom of the vertical groove which is at the same side as the positioning wheel, when the seal housing is depressed, the seal body will move with the fixed shaft along the vertical groove to the bottom of the vertical groove, and the projecting rib of the positioning wheel will embed into the recess of the vertical groove. 
     The driving mechanism comprises a pawl mechanism and a positioning mechanism, the pawl mechanism comprises a ratchet, a pawl and a pawl return spring, the ratchet is fixed on one end of the fixed shaft and is integrated with the fixed shaft, the pawl and a pawl return spring are fixed on the inner wall of the middle frame; the positioning mechanism comprises an anti-inertia positioning wheel, the anti-inertia positioning wheel is mounted on the fixed shaft on the other end of the seal body and is fixed on the end surface of the seal body, three or four projecting ribs are distributed uniformly on the tubular outer wall of the positioning wheel and recessed positioning grooves are arranged on the end surface of projecting ribs which faces towards the vertical wall of the seal housing, projecting positioning ribs fitting with the positioning grooves of the positioning wheel are arranged on the vertical wall of the seal housing correspondingly; when the seal body rotates upwards with the fixed shaft, the ratchet is driven by the pawl, and the seal body is driven to rotate by one-third or one quarter of circumference, so that the positioning grooves are embedded by the projecting positioning ribs on the vertical wall of the seal housing to be positioned accurately. 
     The positioning mechanism further comprises an anti-reversal one-way bearing, and an inner ring of the anti-reverse one-way bearing is fixed on the fixed shaft on the same side as the anti-inertial positioning wheel, the anti-inertial positioning wheel is sleeved on an outer ring of the anti-reversal one-way bearing slidably and is fixed on the end surface of the seal body. 
     A recess fitting with the projecting ribs of the positioning wheel is formed at the bottom of the vertical groove which is at the same side as the positioning wheel, when the seal housing is depressed, the seal body moves with the fixed shaft along the vertical groove to the bottom of the vertical groove, and the projecting ribs of the positioning wheel embed into the recesses of the vertical groove. 
     The number of the teeth of the ratchet is three or four based on the seal body being in a regular triangular prism shape or quadrangular prism shape, and the teeth are distributed uniformly. 
     On the fixed shaft at the same end as the positioning wheel, the top end part inserted into the vertical wall of the seal housing is in a flat shape which is not rotatable. 
     The printing surfaces are fixed on the ink pads which can store ink and are integrated with the ink pads, the ink pads are embedded detachably in the side surfaces of the seal body in regular triangular prism shape or quadrangular prism shape, and refilling holes for refilling ink are formed on the ink pads. 
     Compared with the prior art, the following advantageous effect can be achieved by the present application: the seal integrates the multiple printing surface in an integral whole, can implement semi-automatic overprint of three colors or four colors and is precise in overprint. The seal also supports printing surface replacement and ink-replenishment, and is easy to use and convenient to carry. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a break-out view based on axonometric projection of an integrated overprint colorful seal with multiple printing surfaces according to a preferred first embodiment of the present application, wherein the rotation mechanism  5  is a gear mechanism  58 , and the seal body is in a regular triangular prism shape; 
         FIG. 2  is an orthographic left side view of the first embodiment; 
         FIG. 3  is an orthographic right side view of the first embodiment; 
         FIG. 4  is a view based on left axonometric projection of the seal body  4  in the first embodiment; 
         FIG. 5  is a view based on right axonometric projection of the seal body  4  in the first embodiment; 
         FIG. 6  is a view based on axonometric projection of the seal body  4  with components in separated state in the first embodiment; 
         FIG. 7  is a view based on axonometric projection of the first embodiment with the anti inertial positioning wheel  59  and the seal housing  1  expanded; 
         FIG. 8  is a schematic diagram of working principle of the colorful seal in the first embodiment; 
         FIG. 9  is a break-out view based on axonometric projection of a colorful seal according to a preferred second embodiment of the present application, wherein the drive mechanism  5  is a gear mechanism  58 , and the seal body is in a quadrangular prism shape; 
         FIG. 10  is an orthographic left side view of the colorful seal in the second embodiment; 
         FIG. 11  is an orthographic right side view of the colorful seal in the second embodiment; 
         FIG. 12  is a schematic diagram of working principle of the colorful seal in the second embodiment; 
         FIG. 13  is a break-out view based on axonometric projection of a preferred third embodiment of the present application, wherein the rotation mechanism  5  is a ratchet mechanism  51 , and the seal body is in a quadrangular prism shape; 
         FIG. 14  is an orthographic left side view of the colorful seal in the third embodiment; 
         FIG. 15  is an orthographic right side view of the colorful seal in the third embodiment; 
         FIG. 16  is a view based on left axonometric projection of the seal body  4  in the third embodiment; 
         FIG. 17  is a view based on right axonometric projection of the seal body  4  in the third embodiment; 
         FIG. 18  is a view based on axonometric projection of the seal body  4  with components in separated state in the third embodiment; 
         FIG. 19  is a schematic diagram of working principle of the colorful seal in the third embodiment; 
         FIG. 20  is a break-out view based on axonometric projection of a preferred fourth embodiment of the present application, wherein the rotation mechanism  5  is a ratchet mechanism  51 , and the seal body is in a regular triangular prism shape; 
         FIG. 21  is an orthographic left side view of the fourth embodiment; 
         FIG. 22  is an orthographic right side view of the fourth embodiment; 
         FIG. 23  is a schematic diagram of working principle of the colorful seal in the fourth embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The present application will be further illustrated in the following with reference to the preferred embodiments shown in the accompanying drawings. 
     Refer to  FIGS. 1 to 8 , an integrated overprint colorful seal with multiple printing surfaces according to a preferred first embodiment of the present application comprises a seal housing  1 , a middle frame  2  accommodated in the seal housing  1 , a spring  3  squeezed between the seal housing and the middle frame, a seal body  4  in a regular triangular prism shape, and a driving mechanism  5 . Each side surface  41  of the seal body  4  is a printing surface  60  with a same pattern profile in a different color. A fixed shaft  7  passes through the centers of two end surface  42  of the seal body  4  which are parallel to each other. The two ends of the fixed shaft  7  pass through the vertical grooves  20  on the vertical walls at two sides of the middle frame  2  respectively and are supported on the vertical walls at two sides of the lower portion of the seal housing  1 , so that the seal body  4  is suspended in the middle frame  5 . The drive mechanism  5  is mounted at both ends of the fixed shaft  7 . In this embodiment, the drive mechanism  5  comprises a gear mechanism  58  and a positioning wheel  59  which are mounted on the two ends of the fixed shaft  7  projecting from the central part of the seal body  4  respectively. The gear mechanism  58  comprises a gear  581  and a one-way bearing  582 , and the one-way bearing  582  has an inner ring which is sleeved on one end of the fixed shaft  7  slidably and is fixed on the end surface of the seal body  4 . The gear  581  is sleeved on the outer ring of the one-way bearing  582  tightly and is integrated with the one-way bearing  582 . A rack  200  is fixed on the vertical groove wall of the vertical groove  20  which is at the same end of the middle frame  2  as the gear  581 , and the gear mechanism  58  engages with the rack  200 . The gear ratio of the gear  581  and the rack  200  is 3:1. When the seal housing  1  is depressed, the gear  581  rotates downwards along the rack to drive the outer ring of the one-way bearing  582  rotate while the seal body  4  does not rotate; when the seal housing is relaxed, the gear  581  goes upwards along the rack and rotates, the one-way bearing  582  is locked and can not rotate, therefore the inner ring, the outer ring and the seal body rotate by one-third of the circumference together with the gear  581 . 
     Referring to  FIG. 3 ,  FIGS. 5 and 7 , the positioning wheel  59  is mounted on the fixed shaft  7  at the other side of the seal body  4 . Three projecting ribs  590  are distributed uniformly on a tubular outer wall of the positioning wheel  59 , recessed positioning grooves  591  are arranged on the end surface of the projecting ribs  590  which faces towards the vertical wall of the seal housing  1 . Meanwhile, projecting positioning ribs  12  fitting with the positioning grooves  591  of the positioning wheel  522  are arranged on the vertical wall of the seal housing  1  correspondingly. When the seal housing  1  is not depressed, the gear  581  rotates upwards along the rack to drive the seal body  4  to rotate by one-third of the circumference together with the gear  581 , so that the positioning ribs  12  on the vertical wall of the seal housing  1  embed into the positioning grooves  591  to be positioned precisely, and inertial rotation is prevented. 
     A recess  201  fitting with the projecting ribs  590  of the positioning wheel  59  is formed at the bottom of the vertical groove  20  which is at the same side as the positioning wheel  59 . When the seal housing  1  is depressed and the seal body  4  moves with the fixed shaft  7  along the vertical groove  20  to the bottom of the vertical groove  20 , the projecting rib  590  of the positioning wheel  59  embeds into the recess  201  of the vertical groove  20 . 
     Referring to  FIG. 6 , the printing surfaces  60  are fixed on the ink pads  61  which can store ink and are integrated with the ink pads  61 . The ink pads  61  are embedded detachably in the side surfaces  41  of the seal body  4  in triangular prism shape, and refilling holes  610  for refilling ink are formed on the ink pads  61 . 
     Referring to  FIGS. 9 to 12 , the preferred second embodiment of the present application is substantially similar to the first embodiment, except that the seal body  4  is in a quadrangular prism shape, the gear ratio of the gear  581  and the rack  200  is 4:1, four projecting ribs  590  are distributed uniformly on the tubular outer wall of the positioning wheel  59 , and the number of the projecting positioning ribs  12  on the vertical wall of the seal housing  1  is four correspondingly. 
     Referring to  FIGS. 8 and 12 , the working principle of the first embodiment and the second embodiment is described briefly as following: 
     1. When the seal housing  1  is not depressed, the spring  3  will be in an extended state and the printing surface  60  in one color A of the seal body  4  will face downwards. When the seal housing  1  is depressed, the spring  3  will be squeezed and the seal body  4  will be moved downwards together with the gear  581  along the rack to drive the outer ring of the one-way bearing  582  rotate. Then the seal body  4  moves to the bottom of the vertical grooves  20  on the vertical walls at two sides of the middle frame and does not rotate, and the printing surface in one color A of the seal body is printed on the target. At this time, the projecting rib  590  of the positioning wheel  59  embed into the recess  201  of the vertical groove  20  which is at the same side as the projecting rib  590 , therefore the seal body can not move when printing, as shown in the states a to c in  FIGS. 8 and 12 . 
     2. When the seal housing  1  is relaxed, the gear  581  will move upwards along the rack and rotates, the one-way bearing  582  will be locked and can not rotate. Therefore the inner ring, the outer ring and the seal body  4  rotate together with the gear  581 . When the gear  581  arrives at the up stop point of the rack, the seal body  1  in triangular prism shape will rotate 120° and the seal body  1  in quadrangular prism shape will rotate 90°, the printing surface in another color B of the seal body  1  will face downwards. Thus, the change of the printing surface is achieved, as shown in the states d to e in  FIGS. 8 and 12 . 
     3. When the seal housing  1  is depressed again, the printing surface  60  in another color B will be overprinted on the existing pattern on the target, and so forth. The printing surfaces in three colors of seal body in triangular prism shape will be overprinted three times, and the printing surfaces in four colors of seal body in quadrangular prism shape will be overprinted four times. After printed by the printing surfaces in three colors A to C of seal body in triangular prism shape or by the printing surfaces  60  in four colors A to C of seal body in quadrangular prism shape, colorful pattern is presented on the target. 
     Referring to  FIG. 13  to  FIG. 19 , the preferred third embodiment of the present application is substantially similar to the second embodiment, except that the driving mechanism comprises a pawl mechanism  51  and a positioning mechanism  52 , wherein the pawl mechanism  51  comprises a ratchet  510 , a pawl  512  and a pawl return spring  513 . The ratchet  510  is fixed on one end of the fixed shaft  7  and is integrated with the fixed shaft  7 . The pawl and a pawl return spring are fixed on the inner wall of the middle frame  2 . The number of the teeth of the ratchet  510  is four and the teeth are distributed uniformly. 
     An anti-inertia positioning wheel  522  of the positioning mechanism  52  is mounted on the fixed shaft  7  on the other end of the seal body  4  in quadrangular prism shape and is fixed on the end surface of the seal body  4 . Three or four projecting ribs  5220  are distributed uniformly on the tubular outer wall of the positioning wheel  522  and recessed positioning grooves  5221  are arranged on the end surface of projecting ribs  5220  which are faced towards the vertical wall of the seal housing  1 . Projecting positioning ribs  12  fitting with the positioning grooves  5221  of the positioning wheel  522  are arranged on the vertical wall of the seal housing  1  correspondingly. When the seal body  4  goes upwards with the fixed shaft, the ratchet  510  is driven by the pawl  512 , and the seal body  4  is driven to rotate around the fixed shaft  7  by one quarter of circumference, so that the positioning grooves  5221  is embedded by the projecting positioning ribs  12  on the vertical wall of the seal housing  1  to be positioned accurately. 
     Referring to  FIG. 17 , for position more accurately, the positioning mechanism  52  further comprises an anti-reversal one-way bearing  521 , and the anti-reverse one-way bearing  521  has an inner ring which is fixed on the fixed shaft  7  on the same side as the anti-inertial positioning wheel  522 . The anti-inertial positioning wheel  522  is sleeved on an outer ring of the anti-reversal one-way bearing  521  slidably and is fixed on the end surface of the seal body  4 . 
     Similar to the previous embodiments, the recess  201  fitting with the projecting ribs  5220  of the positioning wheel  522  is formed at the bottom of the vertical groove  20  which is at the same side as the positioning wheel  522 . When the seal housing  1  is depressed and the seal body  4  moves with the fixed shaft  7  along the vertical groove  20  to the bottom of the vertical groove  20 , the projecting rib  5220  of the positioning wheel  522  embeds into the recess  201  of the vertical groove  20 . As shown in  FIG. 8 , on the fixed shaft  7  at the same side as the positioning wheel  522 , the top end part  71  inserted into the vertical wall of the seal housing is in a flat shape which is not rotatable. 
     Referring to  FIG. 18 , the printing surfaces  60  are fixed on the ink pads  61  which can store ink and are integrated with the ink pads  61 . The ink pads  61  are embedded detachably in the side surfaces  41  of the seal body  4  in quadrangular prism shape, and refilling holes  610  for refilling ink are formed on the ink pads  61 . 
     Referring to  FIGS. 20 to 23 , the preferred fourth embodiment of the present application is substantially similar to the third embodiment, except that the seal body  4  is in a regular triangular prism shape, and there are three teeth distributed on the ratchet  510  uniformly. Three projecting ribs  5220  are distributed uniformly on the tubular outer wall of the positioning wheel  522 , and the number of the projecting positioning ribs on the vertical wall of the seal housing  1  is four correspondingly. 
     Referring to  FIGS. 19 and 23 , the working principle of the third embodiment and the fourth embodiment is described briefly as following: 
     1. When the seal housing  1  is not depressed, the spring  3  will be in an extended state and the printing surface  60  in one color A of the seal body  4  will face downwards. When the seal housing  1  is depressed, the ratchet  510  will not be driven by the pawl  512 , the seal body  4  will be moved together with the seal housing  1  to the bottom of the vertical grooves  20  on the vertical walls at two sides of the middle frame  2  and does not rotate, and the printing surface in one color A of the seal body will be printed on the target. At this time, the projecting rib  5220  of the positioning wheel  522  embed into the recess  201  of the vertical groove  20  which will be at the same side as the projecting rib  590 . Therefore the seal body  4  can not move when printing, as shown in the states a to c in  FIGS. 19 and 23 . 
     2. When the seal housing  1  is relaxed, the seal body  1  moves upwards with the fixed shaft  7 , the ratchet  510  is driven by the pawl  512  and the seal body  1  is driven to rotate. When the spring  3  recovers to its original extended state, the pawl will be separated from the ratchet, the seal body  1  in triangular prism shape will rotate 120° and the seal body  1  in quadrangular prism shape will rotate 90°, the printing surface  60  in another color B of the seal body  4  will face downwards. Therefore the change of the printing surface is achieved, as shown in the states d to f in  FIGS. 19 and 23 . 
     3. When the seal housing  1  is depressed again, the printing surface  60  in another color B is overprinted on the existing pattern on the target, and so forth. The printing surfaces in three colors of seal body in triangular prism shape will be overprinted three times, and the printing surfaces in four colors of seal body in quadrangular prism shape will be overprinted four times. After printed by the printing surfaces in three colors A to C of seal body in triangular prism shape or by the printing surfaces  60  in four colors A to C of seal body in quadrangular prism shape, colorful pattern is presented on the target.