Printing packaging paper cutting mechanism

Abstract

The invention relates to the technical field of paper cutting, in particular to a printing packaging paper cutting mechanism which comprises a base table and a lifting part with a frame arranged at the lifting end. The device further comprises a cutter, a moving seat, a limiting piece, a right-angle piece, an area adjusting part and a limiting piece. The limiting area is used for limiting the position of the stacked packaging paper, and the quadrilateral cutting area forming the closed cutting force ring is used for synchronously cutting the four sides of the stacked packaging paper; the device has two adjusting modes of synchronous dynamic adjustment and asynchronous dynamic adjustment of the shapes of the quadrilateral cutting area and the limiting area through the same driving piece, so that the device is adaptive to different or same-size cutting based on packaging paper of the same original size and different or same-size cutting based on packaging paper of different original sizes; the center of the limiting area and the center of the quadrilateral cutting area coincide all the time, so that a stable geometric reference system is established, and the position of the cutter and the limiting area are adjusted all the time with the vertical center line where the coincident center is located as the reference.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paper cutting, in particular to a printing packaging paper cutting mechanism. BACKGROUND

[0002] In the printing industry, packaging paper refers to various types of paper used for product packaging, which usually has certain strength, printing suitability and protection performance. Packaging paper cutting is a key process in packaging production, mainly used for cutting large-size packaging raw materials into specific specifications of finished products. The cutting shape of packaging paper (such as rectangle or square) needs to be adjusted according to product packaging requirements (such as different shapes of box-shaped products). Since rectangle and square are symmetrical figures, high requirements are put forward for the cutting accuracy and edge neatness of packaging paper.

[0003] Traditional packaging paper cutting equipment usually adopts single-edge cutting + independent positioning or double-edge cutting + independent positioning mode, which is mainly suitable for single-size cutting. When facing different original size packaging paper or the demand of cutting the same original size packaging paper into multiple specifications, not only step-by-step and repeated positioning adjustment is needed, but also it is difficult to realize the synchronous adjustment of positioning and cutting knife position. Especially when switching cutting size or replacing packaging paper original specification, the problem of center deviation between positioning and cutting often occurs, which not only reduces the cutting accuracy, but also may cause quality problems such as uneven edge of finished product, size error accumulation, etc., seriously affecting the consistency and yield of products.

[0004] Secondly, when the packaging paper needs to be cut on four sides to form a symmetrical figure such as rectangle or square, the requirements for geometric symmetry and center consistency will be much higher than single-edge or double-edge cutting. If the cutting center and the positioning center are not consistent, the cutting deviation will be further deepened, resulting in reduced cutting accuracy and accumulated quality problems.

[0005] Therefore, it is necessary to provide a printing packaging paper cutting mechanism, which aims to solve the problems of low efficiency, low cutting accuracy and narrow application range caused by step-by-step adjustment, non-uniform reference and inconsistency between cutting center and positioning center in traditional packaging paper cutting technology. SUMMARY

[0006] In order to solve the above problems, the present application provides a printing packaging paper cutting mechanism, comprising a base, a lifting end provided with a lifting part of a frame; the printing packaging paper cutting mechanism further comprises: a cutting knife, the number is four and is circumferentially distributed around the frame center and forms a quadrilateral cutting area, one end of the cutting knife extends to the outside of the quadrilateral cutting area, and the four cutting knives are synchronously lowered to implement cutting; a moving seat corresponding to the cutting knife is slidably installed at the lower end of the frame, and the lower end of the moving seat is slidably connected with the knife rest of the cutting knife; a limiting piece is arranged between the knife rest and the frame; a right-angle piece is arranged at one end of the knife rest and is slidably connected with the adjacent other knife rest; a regulating part is arranged on the frame and comprises: a disc rotatingly arranged around the center of the frame, corresponding to the cutting knife and equidistantly distributed up and down, an inclined plate is hingedly connected between the upper end of the moving seat and the corresponding disc, and the four inclined plates are divided into two groups; a driving piece is arranged on the frame; when the inclined plates of the same group are close to each other around the disc axis, the disc and the corresponding moving seat perform circular motion, under the action of the limiting piece and the right-angle piece, the four cutting knives are synchronously moved radially and kept in contact, the shape of the quadrilateral cutting area is changed; a limiting piece forms a limiting area limiting the position of the packaging paper and has two states of following or not following the change of the quadrilateral cutting area, and the center of the packaging paper and the center of the quadrilateral cutting area always coincide.

[0007] Preferably, the frame comprises a circular ring and a center shaft, the circular ring is slidably connected with the moving seat, and the disc is rotatably installed on the center shaft, and the center shaft, the circular ring and the disc are coaxial.

[0008] Preferably, the moving seat is composed of an upper seat body and a lower seat body rotatably installed at the lower end of the upper seat body, and the lower seat body is limitingly and slidably connected with the knife rest along the length direction of the knife rest.

[0009] Preferably, the limiting piece comprises a clamping plate slidably connected with the knife rest along the length direction of the knife rest, a T-shaped plate is installed at the upper end of the clamping plate and slidably connected with the upper end of the frame, the clamping plate between the two inclined plates of the same group and the center shaft is provided with a boosting plate, one end of the boosting plate is hingedly connected with the clamping plate, and the other end is hingedly connected with a mounting seat vertically and slidably connected with the center shaft.

[0010] Preferably, the right-angle piece is a right-angle plate, one end of the right-angle plate is detachably installed on the corresponding knife rest, and the other end is limitingly and slidably connected with the adjacent other knife rest.

[0011] Preferably, the driving piece comprises a rotating block threadedly installed on the center shaft, the rotating block is located above the uppermost disc, a ring plate is coaxially and slidably installed on the center shaft and located below the lowermost disc, a fixed rod is fixedly installed between the ring plate and the mounting seat, two inverted trapezoidal plates located between the two groups of inclined plates are symmetrically installed on the ring plate, an adapter plate is fixedly installed at the upper end of the inverted trapezoidal plate, the upper end of the adapter plate is rotatably connected with the rotating block, the two inclined surfaces of the inverted trapezoidal plate are always in contact with the side ends of the corresponding inclined plates, and an elastic reset piece is fixedly installed between the two inclined plates of the same group.

[0012] Preferably, the limiting member comprises three positioning blocks corresponding to the three clamping plates respectively, the positioning blocks are in sliding connection with the upper end of the base, the upper end of the positioning blocks is provided with a guide column, and the clamping plate is provided with a guide sleeve matched with the corresponding guide column, and the guide sleeve is located outside the ring.

[0013] Preferably, the elastic pressing member is arranged in the middle of the frame, and the elastic pressing member presses and limits the middle of the stacked wrapping paper during the whole cutting process.

[0014] Preferably, the three positioning blocks cooperate to form a Y-shaped limiting area in the horizontal plane, and when the stacked wrapping paper is pushed into the limiting area and abuts against the positioning blocks, the stacked wrapping paper can be automatically adjusted to be in order immediately.

[0015] Preferably, the positioning block is composed of a fixed part and a movable part in a telescopic structure, a clamping pin is inserted between the telescopic section and the fixed section of the movable part and on the fixed part, and a plurality of insertion slots are formed on the fixed section and the base.

[0016] The present application has the following advantages: 1. The present application has two adjustment modes of synchronously dynamically adjusting and asynchronously dynamically adjusting the shapes of the quadrilateral cutting area and the limiting area by the same driving member, so as to adapt to different or same size cutting based on the same original size wrapping paper and different or same size cutting based on different original size wrapping paper, thereby expanding the application range of the cutting mechanism, and in the two adjustment modes, the limiting area for limiting the position of the wrapping paper and the quadrilateral cutting area always remain in a center coinciding state, that is, the center of the wrapping paper stack always coincides with the center of the quadrilateral cutting area, thereby establishing a stable geometric reference system, and no matter how the original size of the wrapping paper changes, the vertical center line where the coinciding center is located is always used as a reference to adjust the position of the cutting knife and the limiting area.

[0017] 2. Based on the center of the wrapping paper stack always coinciding with the center of the quadrilateral cutting area, the present application can effectively avoid the reference loss problem caused by size change in the traditional edge positioning mode when cutting different original size wrapping paper, ensure the positioning accuracy of wrapping paper of different sizes to be consistent, and avoid the eccentric cutting problem caused by the change of the size of the wrapping paper; for cutting different specifications of the same original size wrapping paper, the center coinciding arrangement can make all the cutting size changes be symmetrical scaling with the center as the reference, and this scaling logic not only maintains the cutting stability, but also ensures the consistency of different specifications of finished products.

[0018] 3. The present application uses the Y-shaped limiting area to limit the degrees of freedom of the stacked wrapping paper from three sides, ensures the stability of the position of the stacked wrapping paper, prevents the stacked wrapping paper from shifting or tilting during the cutting process, and when the stacked wrapping paper is pushed into the limiting area and abuts against the three sides, the stacked wrapping paper can be immediately adjusted to be in order, thereby ensuring the neatness of the stacked wrapping paper.

[0019] 4、The present application is based on the use of limiting area to limit the position of the stacked wrapping paper, and adopts the quadrilateral cutting area constituting the closed cutting force ring to implement the synchronous cutting of the four sides of the stacked wrapping paper, so that the shearing force borne by the wrapping paper stack is evenly distributed, effectively eliminating the material extrusion deformation caused by the traditional single edge cutting, and through mechanical balance, the neatness of the wrapping paper stack cutting section is improved, avoiding the common burr layering phenomenon of single edge cutting, while ensuring the cutting quality and improving the efficiency of batch cutting. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure of the present application.

[0021] Figure 2 is the structure of the part of the present application.

[0022] Figure 3 is the structure of the present application.

[0023] Figure 4 is the structure of the present application.

[0024] Figure 5 is the structure of the present application.

[0025] Figure 6 is the structure of the present application.

[0026] Figure 7 is the structure of the present application.

[0027] Figure 8 is the structure of the present application.

[0028] Figure 9 is the structure of the present application.

[0029] In the figure: 1, base; 2, frame; 3, lifting part; 4, cutting knife; 5, moving seat; 6, limiting part; 7, right-angle part; 8, adjusting area; 9, driving part; 10, limiting part; 11, alignment block; 12, guide sleeve; 13, elastic pressing part; 14, pressure plate; 15, fixed part; 16, fixed section; 20, ring; 21, top plate; 22, center shaft; 50, upper seat body; 51, lower seat body; 60, clamping plate; 61, T-shaped plate; 62, booster plate; 80, disc; 81, inclined plate; 90, rotating block; 91, ring plate; 92, inverted trapezoidal plate. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the concept of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] Referring to Figure 1 , Figure 8 and Figure 9 , a printed packaging paper cutting mechanism is used for synchronous four-side cutting of stacked packaging paper, one-step cutting of packaging paper of required specifications, and different / same size cutting based on the same original size packaging paper and different / same size cutting based on different original size packaging paper, while also implementing multi-directional limiting and middle pressing of the stacked packaging paper to ensure that the stacked packaging paper is neat and stable. The present application has the functions of variable cutting size and high cutting precision. The printed packaging paper cutting mechanism comprises a base 1, a lifting part 3 provided with a frame 2 at the lifting end, and the lifting part 3 is a prior art used for controlling the vertical lifting of the frame 2. The frame 2 comprises a circular ring 20, a top plate 21 located directly above the circular ring 20, a support rod, and a central shaft 22, the support rod is fixedly installed between the circular ring 20 and the top plate 21, the top plate 21 is fixedly connected with the lifting end of the lifting part 3, and the central shaft 22 is fixedly installed at the center of the top plate 21.

[0032] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 7 , the printed packaging paper cutting mechanism further comprises a cutting knife 4, a moving seat 5, a limiting piece 6, a right-angle piece 7, a regulating part 8, and a limiting piece 10. The number of the cutting knives 4 is four, and they are distributed around the center circumference of the frame 2 and interfere with each other to form a quadrilateral cutting area. One end of each of the four cutting knives 4 extends out of the quadrilateral cutting area. A position-avoiding groove is formed on the holder of the cutting knife 4 for avoiding the adjacent holder, so that the adjacent cutting knives 4 interfere with each other to form a complete quadrilateral cutting area. It should be noted that in order to ensure the stability and service life of the cutting knife 4, the length of the exposed holder at the lower end of the cutting knife 4 is limited, and then the thickness of the packaging paper stack adapted to the cutting knife 4 is limited, and the overall thickness of the packaging paper stack must be within the cutting range of the cutting knife 4.

[0033] Referring to Figure 1 , Figure 2 , Figure 4 and Figure 5The moving seat 5 corresponds to the cutting knife 4 and is limitingly and slidingly installed on the ring 20. The lower end of the moving seat 5 is slidingly connected with the knife holder of the cutting knife 4. The moving seat 5 is composed of an upper seat body 50 and a lower seat body 51 which is rotatably installed at the lower end of the upper seat body 50. The inner and outer ring faces of the ring 20 are provided with ring grooves. The upper seat body 50 is slidingly connected between the ring grooves. The lower seat body 51 is limitingly and slidingly connected with the knife holder along the length direction of the knife holder. In order to improve the smoothness of the lower seat body 51 along the knife holder, a ball (not shown in the figure) is movably installed on the lower seat body 51. In addition, the four lower seat bodies 51 shown in the figure have certain differences in size and appearance, but have the same function.

[0034] Referring to Figure 1 , Figure 2 and Figure 5 , the adjusting section 8 is arranged on the frame 2. The adjusting section 8 includes a disc 80 which is rotatably installed on the central shaft 22. The disc 80 corresponds to the cutting knife 4 and is equidistantly distributed up and down. The central shaft 22, the ring 20 and the disc 80 are coaxial. The upper end of the moving seat 5 and the corresponding disc 80 are hingedly connected with an inclined plate 81. The four inclined plates 81 are divided into two groups. As shown in Figure 5 , the four inclined plates 81 are divided into front and rear groups. Each group contains two inclined plates 81 which are distributed left and right.

[0035] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 5 , the limiting piece 6 is arranged between the knife holder and the frame 2. The limiting piece 6 includes a clamping plate 60 which is slidingly connected with the knife holder along the length direction of the knife holder. The upper end of the clamping plate 60 is provided with a T-shaped plate 61 which is slidingly connected with the top plate 21. The T-shaped plate 61 slides along the radial direction of the ring 20. The clamping plate 60 between the two inclined plates 81 in the same group and the central shaft 22 is provided with a boosting plate 62. One end of the boosting plate 62 is hingedly connected with the clamping plate 60. The other end is hingedly connected with a mounting seat which is vertically slidingly connected with the central shaft 22. In order to improve the stability and installation strength of the cutting knife 4, a reinforcing plate is arranged between the clamping plate 60 which is not between the two inclined plates 81 in the same group and the central shaft 22. The reinforcing plate is of telescopic structure and is hingedly installed between the central shaft 22 and the corresponding clamping plate 60. The upper end of the T-shaped plate 61 is slidingly connected with the T-shaped groove which is provided on the top plate 21. In order to improve the smoothness of the T-shaped plate 61 along the top plate 21, a ball is movably arranged on the end surface of the T-shaped plate 61 which contacts with the T-shaped groove. The end of the T-shaped groove is rounded. In order to improve the smoothness of the horizontal linear movement of the knife holder relative to the clamping plate 60, a ball (not shown in the figure) is movably installed on the clamping plate 60.

[0036] Referring to Figure 2 , Figure 7 and Figure 8The right-angle piece 7 is arranged at one end of the tool holder and is in sliding connection with the adjacent other tool holder; the right-angle piece 7 is a right-angle plate, one end of the right-angle plate is detachably mounted on the corresponding tool holder, the other end is in limiting sliding connection with the adjacent other tool holder; a T-shaped sliding groove (as shown in Figure 2 ) is formed on the tool holder, and the other end of the right-angle plate is in sliding connection with the corresponding sliding groove through a T-shaped block.

[0037] Referring to Figure 1 , Figure 2 and Figure 5 , the driving piece 9 comprises a rotating block 90 threadedly mounted on a central shaft 22, the rotating block 90 is located between the uppermost disc 80 and the top plate 21, the central shaft 22 is coaxially and slidingly mounted with a ring plate 91, the ring plate 91 is located below the lowermost disc 80, a fixing rod is fixedly mounted between the ring plate 91 and the mounting seat, the ring plate 91 can only vertically slide along the central shaft 22 under the limitation of the mounting seat; the fixing rod is in rotational connection with the rotating block 90 after penetrating through the ring plate 91, the ring plate 91 is symmetrically mounted with an inverted trapezoidal plate 92 between the two groups of inclined plates 81, the inverted trapezoidal plate 92 is fixedly mounted with a connecting plate at the upper end, the connecting plate is in rotational connection with the rotating block 90 at the upper end, the two inclined surfaces of the inverted trapezoidal plate 92 are always in contact with the side ends of the corresponding inclined plates 81, and the two inclined plates 81 in the same group are fixedly mounted with an elastic reset piece. The elastic reset piece is composed of an arc-shaped frame, arc-shaped blocks slidingly mounted at the two ends of the arc-shaped frame, and a reset spring (not shown in the figure) connected between the inner ends of the arc-shaped blocks, the outer ends of the arc-shaped blocks are detachably mounted with the side ends of the corresponding inclined plates 81, and the arc-shaped frame and the arc-shaped blocks are coaxial with the central shaft 22. The elastic reset piece is used for resetting the inclined plate 81 and buffering the impact force of cutting.

[0038] It should be noted that the side end edges of the corresponding inclined plates 81 are all chamfered, so as to improve the smoothness of the up-down movement of the inclined plates 81 in contact with the side ends of the inclined plates 81 through the inclined surfaces of the inverted trapezoidal plate 92, thereby facilitating the smoothness of the adjustment of the quadrilateral cutting area. The rotation of the rotating block 90 can be controlled manually, and further, in order to facilitate manual control, a plurality of handles (not shown in the figure) can be fixedly mounted on the outer ring surface of the rotating block 90; or in the case that the structural space allows and does not interfere with the movement of other components, the rotating block 90 can be driven to rotate through a motor and a gear set (not shown in the figure), wherein a gear one is mounted on the output shaft of the motor, a gear two is connected with the outside of the rotating block 90 in a spline fit manner, and the gear one and the gear two are in engagement.

[0039] Referring to Figures 1 to 9, the adjusting process of the quadrilateral cutting area shape: control the rotation of the rotating block 90 to rotate and vertically move downward under the thread cooperation with the central shaft 22, under the limit of the vertical sliding connection between the mounting seat and the central shaft 22, the ring plate 91 only vertically moves downward with the rotating block 90, the ring plate 91 drives the inverted trapezoidal plate 92 to synchronously vertically move downward, and the ring plate 91 also drives the mounting seat to synchronously move through the fixed rod; wherein the vertical downward movement of the inverted trapezoidal plate 92 pushes the inclined plate 81 to rotate with the central shaft 22 as the reference, the two inclined plates 81 in the same group rotate towards each other, the elastic return member accumulates the elastic recovery force, and the inclined plate 81 simultaneously drives the disc 80 and the moving seat 5 to synchronously move, the disc 80 only rotates around the central shaft 22, and the moving seat 5 moves circumferentially along the ring 20 coaxial with the central shaft 22; the vertical downward movement of the mounting seat drives the corresponding clamping plate 60 to move through the booster plate 62, and the corresponding clamping plate 60 linearly moves radially along the top plate 21 under the cooperation and limit of the T-shaped plate 61 and the T-shaped groove.

[0040] When the moving seat 5 moves circumferentially along the ring 20, it generates displacement in the horizontal transverse and horizontal longitudinal directions, and the displacement in one direction drives the cutting knife 4 to move radially along the ring 20 (the cutting knife 4 is detachably and fixedly installed on the knife holder, and both synchronously move), the cutting knife 4 drives the T-shaped plate 61 to synchronously move through the clamping plate 60, and the booster plate 62 also drives the corresponding cutting knife 4 to move radially along the ring 20 through the clamping plate 60 connected thereto, thereby improving the smoothness of the radial movement of the cutting knife 4, and the radial movement of the remaining clamping plates 60 causes the corresponding reinforcing plates to expand and contract; the displacement in the other direction drives the lower seat body 51 to move relative to the cutting knife 4 along the length direction of the cutting knife 4, the four cutting knives 4 synchronously move radially, the shape of the quadrilateral cutting area changes (see Figure 8 ), and the shape of the quadrilateral cutting area changes between a rectangle and a square; at the same time, because the four cutting knives 4 abut against each other, the two cutting knives 4 that move towards each other drive the other two cutting knives 4 to linearly move relative to the corresponding lower seat body 51, and because the knife holders of the two adjacent cutting knives 4 are connected with the right-angle plate, one end of which is detachably installed on the corresponding knife holder and the other end of which is limitingly and slidingly connected with the other adjacent knife holder, the two cutting knives 4 that move away from each other pull the corresponding cutting knife 4 to move together with itself. After the shape of the quadrilateral cutting area reaches the required specification, i.e., the specification of the finally cut packaging paper, the rotating block 90 stops rotating and is automatically locked at the current position through thread cooperation.

[0041] For the convenience of understanding the movement state of the four cutters 4 during the shape adjustment of the quadrilateral cutting area, the following is an example of the forward and backward two cutters 4 moving towards each other: when the forward and backward two cutters 4 move towards each other, the left and right two cutters 4 will move towards each other, at the same time, the forward cutter 4 pulls the right cutter 4 holder to move forward through the right angle plate, the rear cutter 4 pulls the left cutter 4 holder to move backward through the corresponding right angle plate, and the right cutter 4 holder will push the rear cutter 4 holder to move left, and the left cutter 4 holder will push the forward cutter 4 holder to move right. The detachable right angle plate on the forward cutter 4 holder is in limited sliding connection with the left cutter 4 holder, the detachable right angle plate on the left cutter 4 holder is in limited sliding connection with the rear cutter 4 holder, the detachable right angle plate on the rear cutter 4 holder is in limited sliding connection with the right cutter 4 holder (see Figure 7 ), and the detachable right angle plate on the right cutter 4 holder is in limited sliding connection with the forward cutter 4 holder.

[0042] Referring to Figure 1 , Figure 2 and Figure 3 , the limiting member 10 is arranged on the base 1 and forms a limiting area limiting the position of the packaging paper, and has two states of following or not following the change of the quadrilateral cutting area, and the center of the packaging paper always coincides with the center of the quadrilateral cutting area. The limiting member 10 comprises three alignment blocks 11 corresponding to three clamping plates 60 respectively; as shown in Figure 3 , the three alignment blocks 11 correspond to the left and right clamping plates 60 and the rear clamping plate 60 respectively; the alignment block 11 is in limited sliding connection with the upper end of the base 1, and a guide column is arranged on the upper end of the alignment block 11, and a guide sleeve 12 matched with the guide column is arranged on the clamping plate 60, and the guide sleeve 12 is located on the outer side of the circular ring 20. The three alignment blocks 11 cooperate to form a Y-shaped limiting area on the horizontal plane; among them, the end of the two symmetrical alignment blocks 11 away from the other alignment block 11 is provided with a guide inclined surface, so that the stacked packaging paper can be quickly and smoothly pushed into the limiting area.

[0043] The synchronous adjustment process of the shape of the limiting area: the clamping plate 60 moves radially while driving the guide column to move through the guide sleeve 12, and the guide column drives the corresponding alignment block 11 to move synchronously, the synchronous movement of the three alignment blocks 11 changes the shape of the Y-shaped limiting area on the horizontal plane synchronously, and then the center of the packaging paper (the intersection of the two diagonal lines) always coincides with the center of the quadrilateral cutting area.

[0044] Referring to Figure 1 , Figure 5 and Figure 6The printed packaging paper cutting mechanism further comprises an elastic pressing piece 13 arranged in the middle of the frame 2. The elastic pressing piece 13 comprises a vertical slot arranged in the middle of the lower end of the central shaft 22, a cylinder in sliding connection with the vertical slot, a pressing disc 14 arranged at the lower end of the cylinder, and an internal spring connected with the inner wall of the vertical slot at the upper end of the cylinder. The upper and lower ends of the pressing disc 14 are both rounded.

[0045] After the shape of the quadrilateral cutting area and the limiting area is adjusted, the stacked packaging paper is pushed into the limiting area and in contact with the alignment blocks 11 by manual operation (or existing conveying equipment and other prior art means). When the three alignment blocks 11 are in contact at the same time, the stacked packaging paper can be immediately adjusted to a neat state, ensuring the neatness of the stacked packaging paper. The limiting area limits the freedom of the stacked packaging paper from three sides, ensuring the stability of the position of the stacked packaging paper and preventing the stacked packaging paper from deviating or tilting during the cutting process, so as to ensure the accuracy of the cutting position. Then, the lifting part 3 controls the frame 2, the central shaft 22 and the cutting knives 4 to move vertically downward at the same time. The guide sleeve 12 moves downward along the guide column at the same time, thereby playing a role of guiding and limiting and improving the stability of the downward movement. The pressing disc 14 will contact the packaging paper before the cutting knives 4. With the continuous downward movement of the frame 2, the pressing disc 14 presses the middle part of the packaging paper stack, and the internal spring gradually contracts. The four cutting knives 4 move downward at the same time to cut the stacked packaging paper from four sides at the same time, and the packaging paper of the required specification is formed in one step. During the cutting process, the pressing disc 14 also stably presses the middle part of the packaging paper. After cutting, the lifting part 3 controls the frame 2, the central shaft 22 and the cutting knives 4 to move vertically upward at the same time. When the cutting knives 4 are separated from the packaging paper, the pressing disc 14 still presses the packaging paper under the action of the elastic force of the internal spring, preventing the packaging paper from being lifted by the cutting knives 4 during the return stroke. Then, the frame 2 continues to move upward until the pressing disc 14 moves upward to the reset position.

[0046] The pressing disc 14 presses the middle part of the stacked packaging paper before the cutting knives 4, which can fix the paper and prevent the stacked packaging paper from deviating or loosening due to the impact force of the cutting knives 4. At the same time, the pressure of the pressing disc 14 causes the air between the papers to be discharged, avoiding the influence of the interlayer sliding on the cutting. In addition, the continuous pressing of the pressing disc 14 on the packaging paper can also convert the original flexible body (packaging paper stack) into a rigid body, thereby improving the stability of the cutting path through the change of the mechanical constraint condition.

[0047] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 8 and Figure 9 , the alignment block 11 is composed of a fixed part 15 and a movable part which is a telescopic structure. A pin is inserted into the telescopic section and the fixed section 16 of the movable part and the fixed part 15. A plurality of evenly distributed insertion slots are arranged on the fixed section 16 and the base 1. The number of insertion slots is set to adapt to different cutting specifications.

[0048] When the telescopic section of the movable part and the fixed section 16 are locked by the bayonet connection, and the fixed part 15 is not locked on the base 1 by the bayonet, the alignment block 11 is an integral structure, the guide sleeve 12 moves the integral structure by the guide column, and the guide plate 60 drives the guide sleeve 12 to move radially synchronously during the change of the shape of the quadrilateral cutting area, so that the size of the limiting area is adjusted synchronously to adapt to the cutting of the packaging paper of different original sizes (see Figure 8 ). When the telescopic section of the movable part and the fixed section 16 are not locked by the bayonet connection, and the fixed part 15 is locked on the base 1 by the bayonet, the guide plate 60 drives only the telescopic section of the movable part to move by the guide sleeve 12 and the guide column during the synchronous radial movement of the four cutting knives 4, that is, the movable part is telescoped, and the size of the limiting area does not change, so as to adapt to the cutting of the packaging paper of the same original size (see Figure 9 ). In the above two adjustment processes, the center of the stacked packaging paper always coincides with the center of the quadrilateral cutting area, and no matter how the original size of the packaging paper changes, the position of the cutting knife 4 and the position of the alignment block 11 are always adjusted based on the vertical center line where the coincident center is located. The setting of the center coincidence makes all the cutting size changes be symmetrical scaling based on the center, which not only maintains the cutting stability, but also ensures the consistency between different specifications of finished products.

[0049] It should be noted that Figure 9 and Figure 8 The rectangular frame composed of a plurality of equidistant black solid points in each of the figures represents the packaging paper, and the dashed line represents the diagonal line. Figure 8 For example, the upper side view in

[0050] The present application integrates the quadrilateral cutting, center positioning and size adjustment into a multifunctional organic whole through a highly integrated and linked mechanical system. The core is to use a set of driving source to synchronously control the deformation of the quadrilateral cutting area and the limiting area through a clever and common motion conversion design, and always ensure the center coincidence of the two. The present application solves the problems of the traditional equipment that need independent systems to adjust the positioning and cutting respectively and the difficulty of center alignment, simplifies the operation steps, and improves the efficiency and precision. Moreover, the center coincidence of the present application not only ensures the precision, but also eliminates the dependence on the original size of the packaging paper, realizes the universality and flexible production of the equipment, which is not realized by the traditional equipment.

[0051] Meanwhile, the present application does not realize the significant technical effect by using high-precision and high-cost complex parts, but realizes it by innovative combination and system integration of conventional mechanical structures.

[0052] In the description of the application, it is to be understood that the terms "center", "length", "thickness", "upper", "lower", "front", "back", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, in the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0053] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] The embodiments of the specific implementation are the preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore; any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A printing and packaging paper cutting mechanism comprising a base, a lifting section provided with a frame at a lifting end, characterized in that, Also include: Cutting knives, four in number and circumferentially distributed around the frame center and mutually interfering to form a quadrilateral cutting area, one end of the cutting knives extending outside the quadrilateral cutting area, the four cutting knives being synchronously lowered to implement cutting; Moving seats corresponding to the cutting knives and slidingly installed at the lower end of the frame, the lower end of the moving seat slidingly connected with the knife holder; Limiting pieces arranged between the knife holder and the frame; Right-angle pieces arranged at one end of the knife holder and slidingly connected with the adjacent other knife holder; Adjusting section arranged on the frame, including: Discs rotatingly arranged around the center of the frame and equidistantly distributed above and below the cutting knives, the upper end of the moving seat hingedly connected with the corresponding disc, the four inclined plates being divided into two groups; Driving pieces arranged on the frame; the driving pieces causing the inclined plates in the same group to approach each other around the disc axis, the disc and the corresponding moving seat performing circular motion, under the action of the limiting pieces and the right-angle pieces, the four cutting knives synchronously moving radially and keeping interference, the shape of the quadrilateral cutting area changing; Limiting pieces forming a limiting area limiting the position of the wrapping paper and having two states of following or not following the change of the quadrilateral cutting area; the center of the wrapping paper always coincides with the center of the quadrilateral cutting area.

2. A printed packaging paper cutting mechanism according to claim 1, characterized in that: The frame includes a circular ring and a central shaft, the circular ring slidingly connected with the moving seat, the disc rotatingly installed on the central shaft, the central shaft, the circular ring and the disc coaxial.

3. A printing and packaging paper cutting mechanism according to claim 1, characterized in that: The moving seat is composed of an upper seat body and a lower seat body rotatingly installed at the lower end of the upper seat body, the lower seat body limitingly and slidingly connected with the knife holder along the length direction of the knife holder.

4. A printed packaging paper cutting mechanism according to claim 2, characterized in that: The limiting pieces include clamping plates slidingly connected with the knife holder along the length direction of the knife holder, T-shaped plates slidingly connected with the upper end of the frame and installed on the upper end of the clamping plates, the clamping plates radially sliding along the circular ring, the clamping plates between the two inclined plates in the same group and the central shaft being provided with boost plates, one end of the boost plate hingedly connected with the clamping plate and the other end hingedly connected with a mounting seat vertically slidingly connected with the central shaft.

5. A printing and packaging paper cutting mechanism according to claim 1, characterized in that: The right-angle pieces are right-angle plates, one end of the right-angle plate detachably installed on the corresponding knife holder and the other end limitingly and slidingly connected with the adjacent other knife holder.

6. A printed packaging paper cutting mechanism according to claim 4, characterized in that: The driving pieces include a rotating block threadedly installed on the central shaft, the rotating block located above the uppermost disc, a ring plate coaxially slidingly installed on the central shaft, the ring plate located below the lowermost disc, a fixed rod fixedly installed between the ring plate and the mounting seat, inverted trapezoidal plates symmetrically installed on the ring plate and located between the two groups of inclined plates, an adapter plate fixedly installed on the upper end of the inverted trapezoidal plate, the adapter plate rotatingly connected with the rotating block, the two inclined surfaces of the inverted trapezoidal plate always in contact with the side end of the corresponding inclined plate, and elastic return pieces fixedly installed between the two inclined plates in the same group.

7. A printing and packaging paper cutting mechanism according to claim 4, characterized in that: The limiting pieces include alignment blocks corresponding to three clamping plates, the alignment blocks limitingly and slidingly connected with the upper end of the base, guide columns installed on the upper end of the alignment blocks, and guide sleeves installed on the clamping plates and matched with the corresponding guide columns, the guide sleeves located outside the circular ring.

8. A printing and packaging paper cutting mechanism according to claim 2, characterized in that: Further including elastic pressing pieces arranged in the middle of the frame; in the whole cutting process, the elastic pressing pieces implement pressing and limiting of the middle part of the stacked wrapping paper.

9. A printed packaging paper cutting mechanism according to claim 7, characterized in that: The three alignment blocks cooperate to form a U-shaped limiting area on the horizontal plane, and when the stacked wrapping paper is pushed into the limiting area and interferes with the alignment blocks, it can be automatically adjusted to a neat state in time.

10. A printed packaging paper cutting mechanism according to claim 7, characterized in that: The alignment block is composed of a fixed part and a movable part in telescopic structure, and the telescopic section and the fixed section of the movable part are inserted with a locking pin, and the fixed section and the base are provided with a plurality of evenly distributed insertion slots.

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