A device for unpacking the outer layer of kraft paper of a paper bag

Abstract

The present invention provides a device for unpacking the outer layer kraft paper of a paper bag, comprising a bracket for supporting the paper bag; a movable assembly comprising a linear guide rail and a movable seat; a cutter assembly disposed below the bracket, comprising a knife holder and a cutter mounted on the knife holder, the knife holder being hingedly connected to the movable seat; a guide seat disposed adjacent to and near the leading end of the linear guide rail, the guide seat being provided with a guide surface extending along the length of the linear guide rail, and the knife holder being provided with a guide wheel; the movable seat reciprocating between the leading and trailing ends of the linear guide rail, the guide wheel contacting the guide surface and, under the action of the guide surface, causing the cutter blade to maintain its blade facing the trailing end of the linear guide rail; after the guide wheel separates from the guide surface, the knife holder rotates, with the cutter blade facing the movable seat. After cutting is completed, the cutter automatically rotates to a position with its blade facing downward, reducing safety hazards.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco processing equipment, and in particular to a device for unpacking the outer layer kraft paper of a paper bag. Background Art

[0002] Cigarette packaging requires carton paper, which is stacked and bundled into bales for transportation. Before production begins, these bales need to be unpacked and unbundled to facilitate handling of individual carton paper by the equipment during processing. Common carton paper bales are wrapped with a layer of kraft paper, which serves as both a protective layer and a binding element. The kraft paper is of a certain width to ensure it effectively restrains the carton paper. In actual production, unpacking is usually done manually, removing the kraft paper from the carton paper bales and transferring them to the packaging machine for cigarette packaging. However, manual unpacking is difficult to meet the production rate of the packaging line, is labor-intensive, and the tools used during unpacking pose safety risks. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and propose a device for unpacking the outer layer of kraft paper of a paper package. When cutting the kraft paper, the cutter blade faces the moving direction. After cutting, the cutter can rotate relative to the movable seat, and the cutter blade faces downward, thereby reducing safety hazards.

[0004] The present invention provides a device for unpacking the outer layer of kraft paper of a paper bag, comprising

[0005] a bracket to support the paper bag;

[0006] Moving components, including linear guides and moving seats;

[0007] a cutter assembly disposed below the bracket, comprising a cutter holder and a cutter disposed on the cutter holder, wherein the cutter holder is hingedly connected to the movable seat, the center of gravity of the cutter holder being offset from the hinge point and the center of gravity of the cutter holder being toward the rear end of the linear guide rail, and the cutter blade being toward the movable seat in an unstressed state;

[0008] A guide seat is provided beside the linear guide rail and close to the head end of the linear guide rail, the guide seat is provided with a guide surface extending along the length direction of the linear guide rail, the length of the guide surface is less than the length of the linear guide rail, and the tool holder is provided with a guide wheel;

[0009] The movable seat moves back and forth between the head and tail ends of the linear guide rail, the guide wheel contacts the guide surface and, under the action of the guide surface, causes the cutter to keep the blade facing the tail end of the linear guide rail. After the guide wheel is separated from the guide surface, the tool holder rotates and the cutter blade faces the movable seat.

[0010] A better technical solution of the present invention: the guide surface includes a first surface and a second surface connected to each other, the first surface is parallel to the linear guide rail, the second surface is inclined upward relative to the linear guide rail and connected to the end face of the guide seat, and the first surface is close to the head end of the linear guide rail.

[0011] A better technical solution of the present invention is as follows: the tool holder includes a connected guide member and a connecting seat, the guide member is arranged above the connecting seat, the cutter is arranged between the guide member and the connecting seat, and the connecting seat is hingedly connected to the movable seat.

[0012] A better technical solution of the present invention: the guide member includes a top surface and a separation surface, the separation surface is arranged below the top surface, the angle between the separation surface and the top surface is an acute angle, and the separation surface and the top surface are connected by a transition fillet. When the guide wheel contacts the first surface, the guide member is parallel to the linear guide rail, and the transition fillet is toward the tail end of the linear guide rail.

[0013] A preferred technical solution of the present invention is that the transition fillet protrudes from the cutter.

[0014] A preferred technical solution of the present invention is that the angle between the separation surface and the top surface is less than 45 degrees.

[0015] A better technical solution of the present invention is as follows: a receiving groove is provided on the movable seat, the connecting seat is provided in the receiving groove, an avoidance portion is provided at the end of the connecting seat, the avoidance portion faces the tail end of the linear guide rail, and the distance between the avoidance portion and the bottom surface of the receiving groove is greater than the distance between the bottom surface of the connecting seat and the bottom surface of the receiving groove.

[0016] A better technical solution of the present invention is that the bracket includes two support plates spaced apart along the length direction of the linear guide rail. When the bracket supports the paper bag, the kraft paper is located between the two support plates, and the top surface of the support plates is in contact with the paper bag.

[0017] A better technical solution of the present invention is: a telescopic member is provided between the two support plates, a suction cup is provided at the end of the telescopic member, the suction cup faces the bottom of the paper bag, and the telescopic member is used to drive the suction cup close to or away from the kraft paper.

[0018] A preferred technical solution of the present invention is that the kraft paper is wound around the middle of the paper package, and the length of the linear guide rail is greater than the width of the kraft paper winding.

[0019] The device for unpacking the outer kraft paper of a paper bag of the present invention has the following beneficial effects:

[0020] 1. The cutter is hingedly connected to the movable base through the tool holder. The cutter is eccentrically set on the tool holder, and the guide base is set beside the linear guide rail. The cutter assembly contacts the guide base through the guide wheel, and the guide base provides guidance for the movement of the cutter. The direction of the cutter blade is adjusted by changing the contact state between the guide wheel and the guide base, so that when working, the cutter blade faces the moving direction to cut the kraft paper. After cutting, the cutter blade faces downward to avoid safety hazards.

[0021] 2. A guide is provided above the cutter, which has an inclined separation surface and a transition fillet. The transition fillet protrudes from the cutter, so that during the movement, the transition fillet is inserted before the cutter into the space between the kraft paper and the paper package, separating the kraft paper from the paper package. The cutter only cuts the kraft paper, avoiding cutting the strip of box paper.

[0022] 3. A suction cup is provided beside the linear guide rail, which can move up and down under the action of the telescopic part. The suction cup moves upward to approach the bottom of the paper bag, absorbs the kraft paper, and then moves downward to separate the kraft paper from the paper bag, so that the guide part can enter between the kraft paper and the paper bag, and the cutter only cuts the kraft paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In the drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. It is clear that those skilled in the art can derive other drawings from these drawings without inventive effort.

[0024] Figure 1 It is a structural entity of an embodiment of the present invention.

[0025] Figure 2 It is a front view of an embodiment of the present invention.

[0026] Figure 3 For the embodiment of the present invention Figure 1 Enlarged view of point A in the middle.

[0027] Figure 4 Schematic diagram of the cooperation between the cutter assembly and the guide seat according to an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the cooperation between the cutter assembly and the guide seat from another perspective according to an embodiment of the present invention.

[0029] Figure 6 This is a front view of a cutter assembly according to an embodiment of the present invention.

[0030] Figure 7 It is a front view of the guide seat according to an embodiment of the present invention.

[0031] In the figure: 10, paper bag; 11, kraft paper; 20, frame; 30, bracket; 31, support plate; 32, telescopic member; 321, suction cup; 40, cutter assembly; 41, cutter; 42, connecting seat; 421, avoidance portion; 43, guide member; 431, separation surface; 432, transition fillet; 44, connecting rod; 45, guide wheel; 51, moving seat; 511, accommodating groove; 52, guide rail; 53, slide cylinder; 60, guide seat; 61, guide surface; 611, first surface; 612, second surface. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other in any way.

[0033] See also Figures 1 to 7 A device for unpacking the outer layer of kraft paper of a paper bag comprises a bracket 30, a cutter assembly 40, and a moving assembly. The bracket 30 is used to support the paper bag 10. The cutter assembly 40 and the moving assembly are both arranged below the paper bag 10. The cutter assembly 40 comprises a cutter 41 and a knife holder. The cutter 41 is eccentrically arranged on the knife holder. The moving assembly comprises a linear guide rail 52 and a moving seat 51. The knife holder is rotatably arranged on the moving seat 51. The moving seat 51 moves back and forth along the linear guide rail 52, driving the cutter assembly 40 thereon to move and cut the kraft paper 11 wrapped around the outer layer of the paper bag 10. The linear guide rail 52 A guide seat 60 is provided on the side thereof, and a guide surface 61 is provided on the guide seat 60. A guide wheel 45 is provided on the knife holder. During the movement of the cutter assembly 40, the guide wheel 45 contacts the guide surface 61. Under the limiting and guiding action of the guide surface 61, the blade of the cutter 41 faces the direction of movement, and the cutter 41 cuts as the movable seat 51 moves. When the guide wheel 45 separates from the guide surface 61, the cutter 41 loses the external force, and the knife holder rotates under the influence of gravity, with the blade of the cutter 41 facing downward, thereby preventing the blade of the cutter 41 from being exposed to the outside, thereby reducing safety hazards.

[0034] The common form of wrapping the carton paper package 10 with kraft paper 11 is that the kraft paper 11 is wrapped around the center of the carton paper package 10, and the side edges of the kraft paper 11 are a certain distance away from the side edges of the carton paper package 10, that is, the kraft paper 11 does not completely wrap the carton paper package 10, and the carton paper package 10 is exposed from both sides of the kraft paper 11. In this embodiment, Figure 1 and Figure 2As shown, it is taken as an example that the kraft paper 11 is wound along the width direction of the box paper package 10, and the winding width of the kraft paper 11 is the width of the kraft paper 11.

[0035] See also Figure 1 and Figure 2 The bracket 30 includes two parallel support plates 31 fixed to the top surface of the frame 20. The two support plates 31 are spaced apart along the length of the paper bale 10. The paper bale 10 is placed on the support plates 31, and the two support plates 31 support the paper bale 10 at both ends. It should be noted that the distance between the two support plates 31 should be greater than the wrapping width of the kraft paper 11 so that when the support plates 31 support the paper bale 10, they only contact the paper bale 10 and do not contact the kraft paper 11. This prevents the kraft paper 11 from being pressed against the top surface of the support plates 31 by the paper bale 10, thereby affecting the cutting of the kraft paper 11 by the cutter assembly 40 and hindering the separation of the kraft paper 11 from the paper bale 10.

[0036] In this embodiment, the moving assembly further includes a slide cylinder 53. A moving base 51 is fixedly mounted on the slide. The moving base 51 is slidably connected to a guide rail 52. The moving base 51 can be driven by the slide cylinder 53 to reciprocate along the linear guide rail 52. The two ends of the linear guide rail 52 are defined as the leading end and the trailing end, respectively. When the moving base 51 moves from the leading end to the trailing end, the cutter assembly 40 cuts the kraft paper 11. When the moving base 51 moves from the trailing end to the leading end, it resets and prepares for the next cut.

[0037] As another embodiment, the moving assembly may be a ball screw structure or a gear rack structure, which can also achieve the purpose of driving the cutter assembly 40 to move back and forth in a straight line.

[0038] In this embodiment, the linear guide rail 52 is arranged on the top surface of the frame 20 along the length direction of the paper package 10. The length of the linear guide rail 52 is greater than the winding width of the kraft paper 11, and the tail ends of the linear guide rail 52 are respectively located on both sides of the kraft paper 11, so that the cutter assembly 40 can completely cut the kraft paper 11 when moving along the linear guide rail 52.

[0039] See also Figures 3 to 7 The blade holder includes a guide member 43 and a connecting seat 42. The guide member 43 is located above the connecting seat 42. The connecting seat 42 is hingedly connected to the movable seat 51. The cutter 41 is disposed between the guide member 43 and the connecting seat 42, and the cutter 41 is offset from the hinge point of the connecting seat 42, thereby shifting the center of gravity of the connecting seat 42. When the cutter assembly 40 is not subjected to external force, the center of gravity of the connecting seat 42 is offset, and the connecting seat 42 rotates under the influence of its own weight and the weight of the cutter 41. The cutter 41 rotates so that the blade is facing downward, avoiding the exposure of the blade of the cutter 41, which poses a safety hazard.

[0040] In this embodiment, the guide member 43 and the connecting seat 42 are both plate members, and the guide member 43 is parallel to the connecting seat 42. A connecting rod 44 is provided in the middle of the connecting seat 42. The two ends of the guide member 43 are respectively a free end and a fixed end. The connecting rod 44 is vertically connected to the fixed end of the guide member 43, so that its cross-section is an inverted L-shape, and the cutter 41 is inclined and connects the guide member 43 and the connecting rod 44. The middle part of the connecting seat 42 is hingedly connected to the movable seat 51, and the free end of the guide member 43 faces the tail end of the linear guide rail 52. When the connecting seat 42 rotates until the guide member 43 is parallel to the linear guide rail 52, the blade of the cutter 41 faces the tail end of the linear guide rail 52 and the connecting seat 42, and the movable seat 51 moves from the head end to the tail end along the linear guide rail 52, and the cutter 41 moves synchronously to cut the kraft paper 11 in the moving direction; when not affected by external force, the weight of the cutter 41 causes the connecting seat 42 to rotate, and the cutter 41 rotates downward, and the blade of the cutter 41 faces the movable seat 51 and the connecting seat 42, which can reduce safety hazards.

[0041] A guide seat 60 is provided beside the head end of the linear guide rail 52, and a guide wheel 45 is provided on the connecting seat 42. During the movement of the moving seat 51, the guide wheel 45 contacts the guide seat 60. The guide seat 60 provides guidance for the guide wheel 45, limits the rotation angle of the connecting seat 42, and enables the cutter 41 to keep the blade facing the tail end of the linear guide rail 52 to achieve cutting.

[0042] In this embodiment, a guide surface 61 is disposed at the bottom of the guide seat 60 and includes a first surface 611 and a second surface 612 connected thereto. The first surface 611 is a flat surface and parallel to the linear guide rail 52, located near the leading end of the linear guide rail 52. The second surface 612 is higher than the first surface 611 and is tilted upward relative to the linear guide rail 52 and connected to the end surface of the guide seat 60. A guide wheel 45 is disposed on the side of the connecting seat 42. The guide wheel 45 and the guide member 43 are located on either side of the connecting rod 44. The guide wheel 45 can rotate about its central axis to facilitate rolling along the guide surface 61, thereby reducing friction. The guide wheel 45 is located below the guide surface 61, and the distance between the central axis of the guide wheel 45 and the first surface 611 is such that when the guide wheel 45 contacts the guide surface 61, the guide member 43 is parallel to the linear guide rail 52, i.e., the cutting edge of the cutter 41 faces the trailing end of the linear guide rail 52.

[0043] The working process of the guide wheel 45 and the guide seat 60 is that when the movable seat 51 is located at the head end of the linear guide rail 52, the guide wheel 45 contacts the first surface 611 of the guide surface 61, and the connecting seat 42 should rotate under the action of the gravity of the cutter 41, but because the first surface 611 limits its displacement above the guide wheel 45, the connecting seat 42 cannot rotate, and the connecting seat 42 remains in a state where the guide member 43 is parallel to the linear guide rail 52. In the process of the movable seat 51 moving from the head end of the linear guide rail 52 to the tail end of the linear guide rail 52, the guide wheel 45 first moves along the first surface 611, and the cutter 41 moves toward the tail end of the linear guide rail 52, cutting the kraft paper 11 during the movement; in the process of the guide wheel 45 gradually moving along the first surface 611 to the second surface 612, since the second surface 612 is higher than the first surface 611, the limit of the guide wheel 45 by the second surface 612 is reduced, and the connecting seat 42 rotates downward under the gravity of the cutter 41, and the guide wheel 45 rotates upward and contacts the second surface 612. Since the second surface 612 is inclined upward relative to the linear guide rail 52, the guide wheel 45 gradually rotates upward during the movement, and the cutter 41 gradually rotates downward until the guide wheel 45 disengages from the second surface 612, the connecting seat 42 is not affected by external force, and the cutter 41 rotates to the extreme position with the blade facing downward.

[0044] When the movable seat 51 returns to its position, it moves from the tail end of the linear guide rail 52 to the head end of the linear guide rail 52. Before it contacts the guide seat 60, the cutter 41 is acted upon by the gravity of the cutter 41, and moves with the blade facing downward until the guide wheel 45 contacts the guide seat 60, and rolls along the second surface 612 and the first surface 611 in sequence. Under the guidance and limiting action of the second surface 612, the guide wheel 45 gradually rotates downward, thereby driving the connecting seat 42 to rotate, causing the cutter 41 to rotate upward until the guide wheel 45 contacts the first surface 611. Under the limitation of the first surface 611, the connecting seat 42 is in a state where the guide part 43 is parallel to the linear guide rail 52, and the blade of the cutter 41 faces the tail end of the linear guide rail 52, ready for the next cutting.

[0045] In order to ensure that after the cutter 41 completes cutting of the kraft paper 11, the connecting seat 42 is separated from the guide seat 60, and the cutter 41 can automatically rotate to the blade-down state, the length of the guide surface 61 should be less than the distance between the farthest side of the kraft paper 11 and the head end of the linear guide rail 52.

[0046] The cam 42 is provided with a groove 511 on the top of the movable seat 51, and the groove 511 is provided along the length direction of the linear guide rail 52 and passes through the movable seat 51. The connecting seat 42 is inserted into the groove 511 and can be rotatably connected to the inner wall of the groove 511. The end of the connecting seat 42 is provided with an avoidance portion 421, and the avoidance portion 421 is close to the tail end of the linear guide rail 52. Specifically, in this embodiment, the avoidance portion 421 is an inclined surface, which extends from the middle of the bottom surface of the connecting seat 42 to the middle of the end surface of the connecting seat 42 to form a notch at the end of the bottom surface of the connecting seat 42, so that the distance between the avoidance portion 421 and the bottom surface of the groove 511 is smaller than the distance between the bottom surface of the connecting seat 42 and the bottom surface of the groove 511, so as to avoid that when the cutter 41 rotates downward, the cutter 41 has not yet rotated to the blade-facing state, and the bottom of the connecting seat 42 contacts the bottom of the groove 511, causing the cutter 41 to not rotate into place and the blade still facing the end of the linear guide rail 52, causing a safety hazard.

[0047] The guide member 43 is used to assist the cutter 41 in cutting the kraft paper 11. A separation surface 431 is provided on the guide member 43. The separation surface 431 is provided at the free end of the guide member 43. There is an acute angle between the separation surface 431 and the top surface of the guide member 43, and the separation surface 431 and the top surface of the guide member 43 are transitioned through a transition fillet 432. The cutter 41 is provided below the guide member 43. In the length direction of the linear guide rail 52, the transition fillet 432 protrudes from the cutter 41.

[0048] The working process of the guide member 43 is as follows: the cutter assembly 40 moves toward the end of the linear guide rail 52 along the movable seat 51, and the top surface of the guide member 43 is close to the bottom surface of the paper bag 10. During the movement, the guide member 43 contacts the kraft paper 11 before the cutter 41, and the transition radius 432 is inserted into the gap between the bottom surface of the paper bag 10 and the kraft paper 11. As the movable seat 51 advances, the transition radius 432 gradually penetrates deeper, and the kraft paper 11 gradually separates from the bottom surface of the paper bag 10 along the separation surface 431 until the cutter 41 contacts the kraft paper 11 and cuts the kraft paper 11.

[0049] The length of the first surface 611 should be greater than or equal to the distance between the nearest side of the kraft paper 11 and the head end of the linear guide 52, so that the guide wheel 45 contacts the first surface 611, so that the connecting seat 42 keeps the guide member 43 parallel to the linear guide 52 and the free end of the guide member 43 faces the tail end of the linear guide 52, so that the connecting seat 42 can remain in this state to insert the transition radius 432 between the paper bag 10 and the kraft paper 11, separate the paper bag 10 and the kraft paper 11, and facilitate cutting by the cutter 41; avoid rising along the second surface 612 before the guide member 43 is inserted between the kraft paper 11 and the paper bag 10, causing the connecting seat 42 to rotate, the direction of the blade of the cutter 41 to change, and the inability to cut the kraft paper 11.

[0050] Preferably, the angle between the separation surface 431 and the top surface of the guide member 43 is less than 45 degrees to prevent the transition radius 432 from being inserted between the paper bag 10 and the kraft paper 11 and before the kraft paper 11 contacts the cutter 41, so that the separation distance between the paper bag 10 and the kraft paper 11 is too large, causing the kraft paper 11 to be tightened and tightly wrapped around the top of the paper bag 10, causing the edges of the paper bag 10 to bend and forming creases on the box paper.

[0051] Furthermore, a telescopic member 32 and a suction cup 321 are provided below the paper bag 10. The telescopic member 32 is located beside the linear guide rail 52 and between the two support plates 31. The telescopic rod is perpendicular to the bottom surface of the paper bag 10. The suction cup 321 is provided at the end of the telescopic member 32 and can move up and down under the drive of the telescopic member 32, approaching or moving away from the kraft paper 11. Specifically, the telescopic member 32 is a telescopic cylinder, and the suction cup 321 is provided at the piston end of the telescopic member 32. Before the cutter 41 cuts, the telescopic member 32 extends to allow the suction cup 321 to absorb the kraft paper 11. After absorption, the telescopic member 32 shortens, driving the suction cup 321 to move downward, separating the kraft paper 11 from the paper bag 10. This allows the excessive rounded corners on the guide member 43 to be inserted between the kraft paper 11 and the paper bag 10, facilitating the cutter 41 to cut the kraft paper 11.

[0052] The working process of the present application is as follows: the paper bag 10 is placed on the bracket 30, the support plate 31 contacts both ends of the paper bag 10 for support, the kraft paper 11 is located between the two support plates 31, the telescopic member 32 is extended, and the suction cup 321 absorbs the kraft paper 11, then the telescopic member 32 is shortened, and the suction cup 321 drives the kraft paper 11 to move downward a certain distance, so that the kraft paper 11 is separated from the paper bag 10; then the moving seat 51 moves from the head end of the linear guide rail 52 to the tail end of the linear guide rail 52, and the guide wheel 45 rolls along the first surface 611 and the second surface 612 with the moving seat 51 in sequence, and the guide wheel 45 rolls along the first surface 611 and the guide wheel 45 rolls along the first surface 611, and the guide wheel 45 rolls along the first surface 611. The guide member 43 and the cutter 41 remain oriented toward the rear end of the linear guide rail 52. During movement, the guide member 43 inserts into the gap between the kraft paper 11 and the paper bag 10, and the separation surface 431 increases the distance between the kraft paper 11 and the paper bag 10 until the cutter 41 contacts the kraft paper 11. The cutter 41 moves along the width of the kraft paper 11 with the movable base 51, cutting until the cutter 41 completely cuts the kraft paper 11. The guide wheel 45 separates from the guide surface 61, and the weight of the cutter 41 causes the connecting base 42 to rotate. The blade of the cutter 41 faces downward, preventing it from being exposed, and the cut is completed. The movable base 51 then moves from the rear end of the linear guide rail 52 to the front end of the linear guide rail 52. The guide wheel 45 rolls along the second surface 612 and the first surface 611 in sequence, driving the connecting base 42 to rotate during the movement. The blade of the cutter 41 transitions from a downward-facing position to facing the rear end of the linear guide rail 52, preparing for the next cut.

[0053] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for unpacking the outer layer of kraft paper of a paper bag, characterized in that: include a bracket (30) for supporting the paper bag (10); A moving assembly comprising a linear guide rail (52) and a moving seat (51); A cutter assembly (40) is disposed below the bracket (30), comprising a cutter holder and a cutter (41) disposed on the cutter holder, wherein the cutter holder is hingedly connected to the movable seat (51), the center of gravity of the cutter holder deviates from its hinge point, and the center of gravity of the cutter holder faces the rear end of the linear guide rail (52), and in an unstressed state, the blade of the cutter (41) faces the movable seat (51); A guide seat (60) is provided beside the linear guide rail (52) and close to the head end of the linear guide rail (52); a guide surface (61) extending along the length direction of the linear guide rail (52) is provided on the guide seat (60); the length of the guide surface (61) is less than the length of the linear guide rail (52); and a guide wheel (45) is provided on the tool holder; The movable seat (51) reciprocates between the head and tail ends of the linear guide rail (52), the guide wheel (45) contacts the guide surface (61) and, under the action of the guide surface (61), the cutter (41) keeps its blade facing the tail end of the linear guide rail (52), and after the guide wheel (45) separates from the guide surface (61), the tool holder rotates and the blade of the cutter (41) faces the movable seat (51).

2. The device for unpacking the outer kraft paper of a paper bag according to claim 1, characterized in that: The guide surface (61) includes a first surface (611) and a second surface (612) connected to each other, wherein the first surface (611) is parallel to the linear guide rail (52), the second surface (612) is inclined upward relative to the linear guide rail (52) and connected to the end surface of the guide seat (60), and the first surface (611) is close to the head end of the linear guide rail (52).

3. The device for unpacking the outer kraft paper of a paper bag according to claim 2, characterized in that: The knife holder comprises a connected guide member (43) and a connecting seat (42), wherein the guide member (43) is arranged above the connecting seat (42), the cutter (41) is arranged between the guide member (43) and the connecting seat (42), and the connecting seat (42) is hingedly connected to the movable seat (51).

4. The device for unpacking the outer kraft paper of a paper bag according to claim 3, characterized in that: The guide member (43) includes a top surface and a separation surface (431), the separation surface (431) is arranged below the top surface, the angle between the separation surface (431) and the top surface is an acute angle, and the separation surface (431) and the top surface are connected via a transition fillet (432). When the guide wheel (45) contacts the first surface (611), the guide member (43) is parallel to the linear guide rail (52), and the transition fillet (432) faces the tail end of the linear guide rail (52).

5. The device for unpacking the outer kraft paper of a paper bag according to claim 4, characterized in that: The transition fillet (432) protrudes from the cutter (41).

6. The device for unpacking the outer kraft paper of a paper bag according to claim 4, characterized in that: The angle between the separation surface (431) and the top surface is less than 45 degrees.

7. The device for unpacking the outer kraft paper of a paper bag according to claim 3, characterized in that: The movable seat (51) is provided with a receiving groove (511), the connecting seat (42) is arranged in the receiving groove (511), and the end of the connecting seat (42) is provided with a avoiding portion (421), the avoiding portion (421) faces the tail end of the linear guide rail (52), and the distance between the avoiding portion (421) and the bottom surface of the receiving groove (511) is greater than the distance between the bottom surface of the connecting seat (42) and the bottom surface of the receiving groove (511).

8. The device for unpacking the outer kraft paper of a paper bag according to claim 1, characterized in that: The bracket (30) includes two support plates (31) spaced apart along the length direction of the linear guide rail (52). When the bracket (30) supports the paper bag (10), the kraft paper (11) is located between the two support plates (31), and the top surface of the support plate (31) is in contact with the paper bag (10).

9. The device for unpacking the outer kraft paper of a paper bag according to claim 8, characterized in that: A telescopic member (32) is provided between the two support plates (31), and a suction cup (321) is provided at the end of the telescopic member (32). The suction cup (321) faces the bottom of the paper bag (10), and the telescopic member (32) is used to drive the suction cup (321) to move closer to or away from the kraft paper (11).

10. The device for unpacking the outer kraft paper of a paper bag according to claim 1, characterized in that: The kraft paper (11) is wound around the middle of the paper bag (10), and the length of the linear guide rail (52) is greater than the winding width of the kraft paper (11).

Images