Automatic carton opening equipment with tongue buckle

Abstract

The invention discloses an automatic box opening device for tongue buckle carton, which comprises a frame, a feeding unit, a picking unit, a box expansion unit, an ear folding unit, a bottom pressing unit and a tongue buckle limiting unit; the feeding unit is used to place box blanks and continuously feed materials, the picking unit is used to grab the box blanks and drive the box blanks to move and sequentially pass through the box expansion unit and the ear folding unit to the top of the bottom pressing unit, the box expansion unit is used to shape the four side walls of the box blank into a rectangular body, the ear folding unit is used to fold the two bottom side ears into the box, the bottom pressing unit is used to bend the bottom cover and press the tongue buckle into the box body, and the tongue buckle limiting unit is used to assist the tongue buckle to maintain the box entry posture; the box blank is sucked from the feeding unit by the picking unit and driven to the bottom pressing unit, and in the process of the box blank being driven by the picking unit, the box blank is sequentially expanded by the box expansion unit, the bottom side ears are folded by the ear folding unit, and the bottom cover and the tongue buckle are folded by the bottom pressing unit and the tongue buckle limiting unit. It has the following advantages: fully automatic box opening, cost reduction and efficiency improvement.

Description

Technical Field

[0001] The invention relates to packaging machinery and equipment, in particular to automatic box opening equipment for tongue-button cartons. Background Art

[0002] In the packaging machinery industry, cartons are widely used. During storage and transportation, cartons are often in the form of box blanks with compressed space. However, when they are needed for packaging, the box blanks need to be opened and expanded. In the existing technology, manual unpacking is often performed manually. Faced with a large number of unpacking tasks, manual unpacking is inefficient, which affects the production efficiency of the factory. Summary of the invention

[0003] The invention provides an automatic box opening device for a tongue-button carton, which overcomes the deficiencies of the prior art described in the background technology.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A tongue-and-buckle carton automatic unpacking device, the carton is a hexahedral carton, comprising a bottom cover, a tongue-and-buckle integrally extending from one side of the bottom cover, bottom side ears located at two opposite sides of the bottom cover, and four side walls connecting the bottom cover and the two bottom side ears; the device comprises a frame and a feeding unit, a picking unit, a box expansion unit, an ear folding unit, a bottom pressing unit, and a tongue-and-buckle limiting unit installed on the frame; the feeding unit is used to place the carton blanks before unpacking and can continuously feed, the picking unit is used to grab the box blanks and can drive the box blanks to move in a straight line, passing through the box expansion unit and the ear folding unit in sequence to the top of the bottom pressing unit, and the box expansion unit is used to push the box blanks during the movement of the box blanks The side walls of the carton on the blank cause the four side walls of the box blank to be deformed into a rectangular body. The ear folding unit is used to fold the two bottom side ears on the box blank after the rectangular body is formed into the box. The bottom pressing unit is used to bend the bottom cover and press the tongue buckle into the box body. The tongue buckle limiting unit is used to assist the tongue buckle to maintain the posture of entering the box. The distance between the bottom pressing unit and the ear folding unit is smaller than the width of the bottom cover along the movement direction of the box blank. The box blank is sucked from the feeding unit by the material picking unit and driven to the bottom pressing unit. In the process of the box blank being driven by the material picking unit, the box blank is expanded by the box expanding unit, the bottom side ears are folded by the ear folding unit, and then the bottom cover and the tongue buckle are folded by the bottom pressing unit and the tongue buckle limiting unit.

[0006] In one embodiment: it also includes a box delivery unit, which is used to deliver the unpacked box out of the device.

[0007] In one embodiment: the feeding unit includes a base plate arranged on the frame and a sliding plate slidably connected to the base plate, the base plate is inclined from high to low toward the material taking unit, the plate surface of the sliding plate is parallel to the direction of gravity and slides along the base plate from high to low under the action of gravity, a limit baffle is provided near the lower end of the base plate, and the box blank is placed in an upright state between the sliding plate and the limit baffle.

[0008] In one embodiment: the material picking unit includes a first driving cylinder, a slide, a guide rail and a suction cup mechanism, the guide rail and the first driving cylinder are horizontally arranged on the frame, the slide is slidably connected to the guide rail and is fixedly connected to the moving part of the first driving cylinder, the suction cup of the suction cup mechanism is arranged on the slide and the mouth of the suction cup faces the feeding unit, and the slide is driven by the first driving cylinder to move along the guide rail to drive the suction cup to move.

[0009] In one embodiment, the box expansion unit is a horizontally placed flat plate arranged on a frame, and the flat plate has a chamfered arc angle that can exert a push-up effect on the box body side wall of the box blank when the box blank passes through to expand the box.

[0010] In one embodiment: the folding ear unit includes two second driving cylinders, the moving part of each second driving cylinder is fixedly connected to a piece, the two second driving cylinders are arranged opposite to each other, and the cylinder body of the second driving cylinder is tilted so that the moving part moves relatively obliquely upward to fold the two bottom side ears of the box body respectively.

[0011] In one embodiment: the bottom pressing unit includes a third driving cylinder and a fourth driving cylinder that move up and down, the moving part of the third driving cylinder is fixedly connected to a horizontally arranged bottom pressing plate, the moving part of the fourth driving cylinder is fixedly connected to a horizontally arranged folding tongue buckle plate, the folding tongue buckle plate and the bottom pressing plate are arranged side by side and in parallel, and the bottom cover of the box blank first passes through the folding tongue buckle plate and then reaches the bottom pressing plate under the drive of the material picking unit; the tongue buckle limiting unit includes a fifth driving cylinder that can drive horizontal movement and a horizontally arranged limiting rod, the moving part of the fifth driving cylinder is fixedly connected to one end of the limiting rod, the limiting rod is located between the bottom pressing plate and the folding tongue buckle plate and is parallel to the bottom pressing plate and the folding tongue buckle plate, and the height of the bottom pressing plate, the folding tongue buckle plate and the limiting rod are equivalent when the third driving cylinder and the fourth driving cylinder are not in action.

[0012] In one embodiment, the folding tongue buckle plate includes a first plate and a second plate fixedly connected to each other, wherein the second plate is located between the bottom plate and the first plate and at least partially protrudes above the first plate.

[0013] In one embodiment, the tongue buckle limiting unit further includes a limiting plate disposed on the opposite side of the limiting rod stroke and used to limit the travel distance of the limiting rod.

[0014] In one embodiment: the bottom pressing unit further includes a sixth driving cylinder capable of driving horizontal movement, and a moving portion of the sixth driving cylinder is connected to the third driving cylinder and the fourth driving cylinder.

[0015] In one embodiment: the box delivery unit includes a seventh driving cylinder and a push plate capable of driving horizontal movement, the moving part of the seventh driving cylinder is fixedly connected to the push plate, and the moving direction of the moving part of the seventh driving cylinder is perpendicular to the moving direction of the moving part of the sixth driving cylinder.

[0016] In one embodiment, a baffle is provided at the front end of the bottom pressing unit for limiting the travel distance of the box blank.

[0017] Compared with the background technology, this technical solution has the following advantages:

[0018] Through the automatic unpacking equipment described in this case, the box blanks can be automatically unpacked without manual unpacking, which greatly saves labor and labor costs. At the same time, the entire unpacking process is fully automatic, which greatly improves the degree of automation in production, improves production efficiency, and increases efficiency and reduces costs for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 This is one of the three-dimensional structural schematic diagrams of an automatic box opening device with a tongue buckle.

[0021] Figure 2 This is the second schematic diagram of the three-dimensional structure of an automatic box opening device with a tongue buckle.

[0022] Figure 3 It is a schematic diagram of the structure of the box blank.

[0023] Figure 4 It is a schematic diagram of the structure of the feeding unit.

[0024] Figure 5 It is a structural schematic diagram of the material taking unit.

[0025] Figure 6 It is a schematic diagram of the structure of the folding ear unit.

[0026] Figure 7 It is a structural schematic diagram of the bottom pressing unit.

[0027] Figure 8 It is a structural schematic diagram of the tongue buckle limiting unit.

[0028] Fig. 9 This is a schematic diagram of the structure of the box delivery unit. DETAILED DESCRIPTION

[0029] The invention discloses an automatic box-opening device for tongue-buckled cartons, wherein the carton is a hexahedral carton, comprising a bottom cover 101, a tongue buckle 102 integrally extending from one side of the bottom cover 101, bottom side ears 103 located at two opposite sides of the bottom cover 101, and four side walls 104 connecting the bottom cover 101 and the two bottom side ears 103, and usually also comprising an upper cover, a tongue buckle integrally extending from one side of the upper cover, and upper side ears located at two opposite sides of the upper cover. The box-opening device only operates the bottom cover 101, the tongue buckle 102 extending from the bottom cover 101, the bottom side ears 103, and the side walls 104 of the carton 100.

[0030] Please refer to Figure 1 , Figure 2 and Figure 3 The device includes a frame 1 and a feeding unit 10, a picking unit 20, a box expansion unit 30, an ear folding unit 40, a bottom pressing unit 50, and a tongue buckle limiting unit 60 installed on the frame 1; the feeding unit 10 is used to place the box blank 100 before opening the box and can continuously feed the material, the picking unit 20 is used to grab the box blank 100 and can drive the box blank 100 to move along a straight line through the box expansion unit 30 and the ear folding unit 40 in sequence to the top of the bottom pressing unit 50, and the box expansion unit 30 is used to push the carton side wall 104 on the box blank 100 during the movement of the box blank 100 so that the four side walls 104 of the box blank 100 are deformed into a rectangle The box blank 100 is a rectangular body, the folding ear unit 40 is used to fold the two bottom side ears 103 on the box blank 100 after the rectangular body is formed into the box, the bottom pressing unit 50 is used to bend the bottom cover 101 and press the tongue buckle 102 into the box body, and the tongue buckle limiting unit 60 is used to assist the tongue buckle 102 to maintain the posture of entering the box; the distance between the bottom pressing unit 50 and the folding ear unit 40 is smaller than the width of the bottom cover 101 along the movement direction of the box blank 100, so as to ensure that when the box blank 100 is bent by the bottom pressing unit 50 to bend the bottom cover 101, the bottom side ears 103 remain in the folded state so that the bottom side ears 103 are limited between the side wall 104 and the bottom cover 101 when the bottom cover 101 is bent.

[0031] Please refer to Figure 4 The feeding unit 10 includes a bottom plate 11 disposed on the frame and a sliding plate 12 slidably connected to the bottom plate 11. The bottom plate 11 is tilted from high to low toward the direction of the material taking unit 20. The plate surface of the sliding plate 12 is parallel to the gravity direction and slides from high to low along the bottom plate 11 under the action of gravity. A limit stopper 13 is provided near the lower end of the bottom plate 11. The box blank 100 is placed between the sliding plate 12 and the limit stopper 13 in an upright state. The tilt angle of the bottom plate 11 can be set to 60 degrees. The limit stopper 13 is a first stopper 131 disposed at the lower end of the bottom plate 11 and a second stopper 132 located just above the protrusion and fixed on the frame 1. There is a spacing space between the first stopper 131 and the second stopper 132 to allow the box blank 100 to pass through.

[0032] Please refer to Figure 5 The material taking unit 20 comprises a first driving cylinder 21, a carriage 22, a guide rail 23 and a sucker mechanism 24. The guide rail 23 and the first driving cylinder 21 are horizontally arranged on the frame 1. The carriage 22 is slidably connected to the guide rail 23 and fixedly connected to the moving part of the first driving cylinder 21. The sucker of the sucker mechanism 23 is arranged on the carriage 22 and the mouth of the sucker faces the feeding unit 10. The first driving cylinder 21 drives the carriage 22 to move horizontally along the guide rail 23 to drive the sucker to move. The sucker mechanism 24 is a pneumatic sucker mechanism.

[0033] The box expansion unit 30 is a horizontally placed flat plate arranged on the frame 1. The flat plate has a chamfered arc angle that can resist the box body side wall 104 of the box body 100 when the box body 100 passes by to expand the box body. The four side walls 104 of the box body are in a parallelogram deformation and compression state in the box body state. The suction cup is adsorbed on one side wall of the four side walls 104, called the adsorption side wall. The arc angle acts on the adjacent side wall of the adsorption side wall. When the suction cup drives the box body 100 to move, under the pulling force of the suction cup on the adsorption side wall and the push of the chamfered arc angle of the flat plate on the adjacent side wall of the adsorption side wall (the pushing force and the pulling force are in opposite directions), the four side walls 104 of the box body in the box body state are deformed and stretched in a parallelogram to complete the box body expansion.

[0034] Please refer to Figure 6 The ear folding unit 40 includes two second driving cylinders 41, and the moving part of each second driving cylinder 41 is fixedly connected to a piece 42. The two second driving cylinders 41 are arranged opposite to each other, and the cylinder body of the second driving cylinder 41 is tilted so that the moving part moves relatively obliquely upward to fold the two bottom side ears 103 of the box body respectively.

[0035] Please refer to Figure 7 The bottom pressing unit 50 includes a third driving cylinder 51 and a fourth driving cylinder 52 which move upward and downward. The moving part of the third driving cylinder 51 is fixedly connected to a horizontally arranged bottom pressing plate 53. The moving part of the fourth driving cylinder 52 is fixedly connected to a horizontally arranged folding tongue buckle plate 54. The folding tongue buckle plate 54 is arranged side by side and parallel to the bottom pressing plate 53. The bottom cover 101 of the box blank 100 passes through the folding tongue buckle plate 54 and then reaches the bottom pressing plate 53 under the drive of the material taking unit 20. Please refer to Figure 8 The tongue buckle limiting unit 60 includes a fifth driving cylinder 61 capable of driving horizontal movement and a horizontally arranged limiting rod 62. The moving part of the fifth driving cylinder 61 is fixedly connected to one end of the limiting rod 62. The limiting rod 62 is located between the bottom pressing plate 53 and the tongue folding buckle plate 54 and is parallel to the bottom pressing plate 53 and the tongue folding buckle plate 54. When the third driving cylinder 51 and the fourth driving cylinder 53 are not in motion, the bottom pressing plate 53, the tongue folding buckle plate 54 and the limiting rod 62 are at the same height. In this embodiment, a baffle 80 for limiting the moving distance of the box blank 100 is provided at the front end of the stroke of the bottom pressing unit 50.

[0036] In this embodiment, the folding tongue buckle plate 54 includes a first plate 541 and a second plate 542 which are fixedly connected, and the second plate 542 is located between the bottom pressing plate 53 and the first plate 541 and at least partially protrudes above the first plate 541. After the bottom cover 101 passes through the folding tongue buckle plate 54, the portion of the second plate 542 protruding from the first plate 541 can pre-bend the tongue buckle 102.

[0037] The tongue buckle limiting unit 60 further includes a limiting plate 63 disposed on the opposite side of the limiting rod 62 for limiting the travel distance of the limiting rod 62 .

[0038] The bottom pressing unit 50 further includes a sixth drive cylinder 55 capable of driving horizontal movement, and the moving part of the sixth drive cylinder 55 is connected to the third drive cylinder 51 and the fourth drive cylinder 52. When the bottom pressing unit 50 needs to work, the sixth drive cylinder 55 pushes the third drive cylinder 51 and the fourth drive cylinder 52 out.

[0039] Please refer to Fig. 9 The unpacking device further includes a box delivery unit 70 for delivering the unpacked box out of the device. The box delivery unit 70 includes a seventh drive cylinder 71 and a push plate 72 capable of driving horizontal movement. The moving part of the seventh drive cylinder 71 is fixedly connected to the push plate 72, and the moving direction of the moving part of the seventh drive cylinder 71 is perpendicular to the moving direction of the moving part of the sixth drive cylinder 55.

[0040] The first drive cylinder 21 , the second drive cylinder 41 , the third drive cylinder 51 , the fourth drive cylinder 52 , the fifth drive cylinder 61 , the sixth drive cylinder 55 and the seventh drive cylinder 71 are cylinders, and their moving parts are moving parts driven by pistons.

[0041] The working process of the unpacking device described in this embodiment is as follows:

[0042] The box blanks 100 are stacked on the bottom plate 11 of the feeding unit 10 and are supported between the sliding plate 12 and the limit stopper 13, and the bottom cover 101 of the box blanks 100 is placed downward; the moving part of the first driving cylinder 21 of the picking unit 20 moves forward to the feeding unit 10 and sucks the box blanks 100 located at the front end of the feeding unit 10 through the suction cup, and then drives the box blanks 100 to move back; during the return process, the box blanks 100 first pass through the box expansion unit 30, and under the pulling force of the suction cup and the thrust of the rounded corners of the flat plate of the box expansion unit 30, the four side walls 101 of the box blank are moved back. 04 is stretched out through parallelogram deformation to complete the box expansion; the expanded box blank then passes through the ear folding unit 40, and under the pushing action of the two second driving cylinders 41 on the two opposite sides of the ear folding unit 40, the two bottom side ears 103 of the box blank 100 are folded inward; after the ear folding unit 40 folds the bottom side ears 103, the box blank 100 reaches the bottom pressing unit 50 (at this time, the second driving cylinder 41 of the ear folding unit 40 still has a pushing action on the bottom side ears 103, and the bottom side ears 103 still remain in a folded state), and when the suction cup pulls the box blank 100, the folding tongue buckle of the bottom pressing unit 50 The plate 54 acts on the bottom cover 101 and bends the bottom cover 101 toward the four side walls 104. When the bottom cover 101 is bent into place (i.e., the box blank 100 reaches the baffle 80 in front of the bottom pressing unit 50, at this time, the angle of the bottom cover 101 relative to the horizontal direction is 10 degrees, that is, the bottom cover 101 is bent into place), the first driving cylinder 21 stops; the fifth driving cylinder 61 is actuated to make the limiting rod 62 extend horizontally and fall above the bottom cover 101 and the tongue buckle 102, and then the fourth driving cylinder 52 is actuated to make the folding tongue buckle plate 54 move upward, and the limiting rod 62 is on the tongue buckle 102. Under the limiting action of the downward direction, the upward folding tongue buckle plate 54 bends the tongue buckle 102 so that the tongue buckle 102 is aligned with the box. At this time, the position of the folding tongue buckle plate 54 is kept unchanged, and the fifth driving cylinder 61 acts and drives the limiting rod 62 to retract to eliminate the limiting of the bottom cover 101 and the tongue buckle 102; then, the third driving cylinder 51 acts and drives the bottom pressing plate 53 to move upward to push the bottom cover 101 upward and press the tongue buckle 102 into the box to complete the buckling of the bottom cover 101. In order to ensure that the bottom cover 101 is buckled firmly, the third driving cylinder 51 can drive the bottom pressing plate 53 to buckle the bottom cover 101 repeatedly. At this point, the box blank 100 is unpacked, and finally the seventh driving cylinder 71 acts to drive the push plate 72 to move, and the box body is pushed out of the equipment.

[0043] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. An automatic box opening device for tongue-buckled cartons, the carton is a hexahedral carton, comprising a bottom cover, a tongue buckle integrally extending from one side of the bottom cover, bottom side ears located on two opposite sides of the bottom cover, and four side walls connecting the bottom cover and the two bottom side ears; characterized in that: The equipment includes a frame and a feeding unit, a picking unit, a box expansion unit, an ear folding unit, a bottom pressing unit, and a tongue buckle limiting unit installed on the frame; the feeding unit is used to place the unopened carton blanks and can continuously feed, the picking unit is used to grab the box blanks and drive the box blanks to move in a straight line through the box expansion unit and the ear folding unit in sequence to the top of the bottom pressing unit, the box expansion unit is used to push the carton side walls on the box blanks during the box blank movement so that the four side walls of the box blanks are deformed into a rectangular body, and the ear folding unit is used to form a rectangular body. The two bottom side ears on the box blank behind the box body are folded inwardly of the box, the bottom pressing unit is used to bend the bottom cover and press the tongue buckle into the box body, the tongue buckle limiting unit is used to assist the tongue buckle in maintaining the posture of entering the box, and the distance between the bottom pressing unit and the ear folding unit is smaller than the width of the bottom cover along the moving direction of the box blank; the box blank is sucked from the feeding unit by the material taking unit and driven to the bottom pressing unit. In the process of the box blank being driven by the material taking unit, the box blank is expanded by the box expanding unit in turn, and the bottom side ears are folded by the ear folding unit, and then the bottom cover and the tongue buckle are folded by the bottom pressing unit and the tongue buckle limiting unit; The bottom pressing unit comprises an up-and-down third driving cylinder and an up-and-down fourth driving cylinder, the moving part of the third driving cylinder is fixedly connected to a horizontally arranged bottom pressing plate, the moving part of the fourth driving cylinder is fixedly connected to a horizontally arranged folding tongue buckle plate, the folding tongue buckle plate and the bottom pressing plate are arranged side by side and in parallel, and the bottom cover of the box blank first passes through the folding tongue buckle plate and then reaches the bottom pressing plate under the drive of the material taking unit; the tongue buckle limiting unit comprises a fifth driving cylinder capable of driving horizontal movement and a horizontally arranged limiting rod, the moving part of the fifth driving cylinder is fixedly connected to one end of the limiting rod, the limiting rod is located between the bottom pressing plate and the folding tongue buckle plate and is parallel to the bottom pressing plate and the folding tongue buckle plate, and the height of the bottom pressing plate, the folding tongue buckle plate and the limiting rod are equivalent when the third driving cylinder and the fourth driving cylinder are not in action; The folding tongue buckle plate comprises a first plate and a second plate which are fixedly connected, wherein the second plate is located between the bottom pressing plate and the first plate and at least partially protrudes above the first plate; When the suction cup pulls the box blank, the folding tongue buckle plate of the bottom pressing unit acts on the bottom cover and bends the bottom cover toward the four side walls.

2. The automatic box opening device with tongue buckle according to claim 1 is characterized by: It also includes a box delivery unit, which is used to deliver the unpacked box out of the device.

3. The automatic box opening device with tongue buckle according to claim 1 is characterized by: The feeding unit includes a base plate arranged on a frame and a sliding plate slidably connected to the base plate. The base plate is inclined from high to low toward the material taking unit. The surface of the sliding plate is parallel to the direction of gravity and slides along the base plate from high to low under the action of gravity. A limit baffle is provided near the lower end of the base plate, and the box blank is placed in an upright state between the sliding plate and the limit baffle.

4. The automatic box opening device for tongue buckle carton according to claim 1, characterized in that: The material picking unit includes a first driving cylinder, a slide, a guide rail and a suction cup mechanism. The guide rail and the first driving cylinder are horizontally arranged on the frame. The slide is slidably connected to the guide rail and is fixedly connected to the moving part of the first driving cylinder. The suction cup of the suction cup mechanism is arranged on the slide and the mouth of the suction cup faces the feeding unit. The slide is driven by the first driving cylinder to move along the guide rail to drive the suction cup to move.

5. The automatic box opening device with tongue buckle according to claim 1 is characterized by: The box expansion unit is a horizontally placed flat plate arranged on a frame, and the flat plate has a chamfered arc angle that can produce a push-up effect on the box body side wall of the box blank when the box blank passes through to expand the box.

6. The automatic box opening device with tongue buckle according to claim 1, characterized in that: The folding ear unit includes two second driving cylinders, the moving part of each second driving cylinder is fixedly connected to a piece, the two second driving cylinders are arranged opposite to each other, and the cylinder bodies of the second driving cylinders are arranged tilted so that the moving parts move relatively obliquely upward to fold the two bottom side ears of the box body respectively.

7. The automatic box opening device with tongue buckle according to claim 1, characterized in that: The tongue buckle limiting unit also includes a limiting plate disposed on the opposite side of the limiting rod stroke and used for limiting the stroke distance of the limiting rod.

8. The automatic box opening device with tongue buckle according to claim 2, characterized in that: The bottom pressing unit further comprises a sixth driving cylinder capable of driving horizontal movement, and a moving part of the sixth driving cylinder is connected to the third driving cylinder and the fourth driving cylinder.

9. The automatic box opening device for tongue buckle carton according to claim 8, characterized in that: The box delivery unit includes a seventh driving cylinder capable of driving horizontal movement and a push plate. The moving part of the seventh driving cylinder is fixedly connected to the push plate, and the moving direction of the moving part of the seventh driving cylinder is perpendicular to the moving direction of the moving part of the sixth driving cylinder.

10. The automatic box opening device with tongue buckle according to claim 1, characterized in that: A baffle plate for limiting the travel distance of the box blank is arranged at a distance from the front end of the travel of the bottom pressing unit.

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