CN116237576A

CN116237576A - Printing machine metal guard plate shearing machine tool with cutter only supported on one side of machine body and shearing method

Info

Publication number: CN116237576A
Application number: CN202211102055.4A
Authority: CN
Inventors: 彭衡
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-06-09

Abstract

The invention discloses a metal guard plate shearing machine tool and a shearing method of a printer, wherein a cutter is only supported on one side of a machine body, and relates to the technical field of machinery. The metal guard plate shearing machine tool and the shearing method of the printer, wherein the cutter is only supported on one side of the machine body, when the shearing cutter rotates anticlockwise to conduct shearing work, the laminating plate can drive the polishing rod to conduct polishing operation on the shearing cutter from right to left, the laminating plate can be tightly attached to the outer wall of the shearing cutter through elastic action of the elastic sheet between the laminating plate and the breast plate, polishing operation is conducted when the shearing cutter moves before shearing work, and shearing efficiency of the shearing cutter is improved.

Description

Printing machine metal guard plate shearing machine tool with cutter only supported on one side of machine body and shearing method

Technical Field

The invention relates to the technical field of machinery, in particular to a cutting machine tool and a cutting method for a metal guard plate of a printer, wherein a cutter is only supported on one side of a machine body.

Background

A printer refers to a machine that prints text and images. In the production process of the metal guard plates of modern printers, a shearing machine tool is used for shearing the metal guard plates so as to shear the metal guard plates suitable for printers with different specifications. The shearing machine tool is a mechanical processing device for cutting metal materials, and the traditional shearing machine tool can automatically conduct shearing operation by adopting a programmed controller, so that the shearing machine tool is widely used in mechanical processing departments such as mechanical manufacturing and repairing.

In the prior art, CN113369555a proposes a cutting tool for a numerical control machine tool, which is used for processing scraps when the tools are switched after the tools are operated, but the scraps in the shearing process are not solved, the scraps are adhered to the tools of the shearing tool, the scraps can affect the friction between the tools and the metal guard plate in shearing, the shearing shape of the metal guard plate is easily affected, the tools are clamped on the metal guard plate in severe cases, and the shearing machine tool equipment is damaged.

Disclosure of Invention

(one) solving the technical problems

Aiming at the defects of the prior art, the invention provides a metal guard plate shearing machine tool and a shearing method of a printer, wherein a cutter is only supported on one side of a machine body, and the problems that in the prior art, in the process of shearing the metal guard plate of the printer, the metal guard plate can generate fragments after being sheared, the fragments can adhere to the cutter of the shearing machine tool, the fragments can influence friction between the cutter and the metal guard plate during shearing, the shearing shape of the metal guard plate is easily influenced, and the cutter is clamped on the metal guard plate during severe conditions, so that the shearing machine tool equipment is damaged are solved.

(II) technical scheme

In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a cutter only is supported the printing machine metal backplate shearing lathe in lathe bed one side, includes backup pad and shearing sword, shearing sword fixed mounting is on rotating the post, the post that rotates is installed in the backup pad, be provided with grinding device on the shearing sword, grinding device includes the rotor plate, the rotor plate top is rotated and is installed on the backup pad outer wall, the rotor plate bottom is rotated and is installed in the slide top, slide bottom fixed mounting has the breast board, the breast board bottom is rotated and is installed the laminating board, through shell fragment elastic connection between laminating board outer wall and the breast board outer wall, the one end fixed mounting that the laminating board is close to shearing sword outer wall has the stick of polishing.

Preferably, the shearing knife is fixedly provided with an L-shaped chute, one end of the breast board, which is close to the shearing knife, is fixedly provided with a sliding column, and the outer wall of the sliding column is slidably arranged in the L-shaped chute.

Preferably, the inside restriction device that is provided with of backup pad, restriction device include drive belt, drive belt bottom fixed mounting is on rotating the post outer wall, rotate on the backup pad outer wall and install the steering column, rotate on the backup pad outer wall and install the rotary drum, be connected through drive belt transmission between steering column, steering column and the rotary drum.

Preferably, the connecting rod is fixedly installed on the outer wall of the rotary drum, an arc limiting plate is fixedly installed at one end, far away from the rotary drum, of the connecting rod, a semicircular convex block is fixedly installed on the outer wall of the arc limiting plate, a cavity for the arc limiting plate to rotate is fixedly formed in the supporting plate, and the transmission belt penetrates through and is slidably installed on the arc limiting plate.

Preferably, the round hole is fixedly arranged on the sliding plate, the elastic device is arranged on the rotating plate and comprises an elastic air bag, the elastic air bag is fixedly arranged on the rotating plate, the outer wall of the bottom of the elastic air bag is fixedly provided with an extrusion column, and the extrusion column is movably arranged inside the round hole.

Preferably, the air outlet end of the bottom of the elastic air bag is fixedly provided with an air blowing pipe, the bottom of the air blowing pipe is close to the outer wall of the shearing knife, the outer wall of the shearing knife is fixedly provided with a vibration lug, the air inlet end of the elastic air bag is fixedly provided with an air inlet pipe, and the top of the air inlet pipe is fixedly provided with a dustproof filter plate.

Preferably, the inside buffer that is provided with of elasticity gasbag, buffer include the arc push pedal, arc push pedal one end is rotated and is installed on elasticity gasbag inner wall, the arc push pedal other end is rotated and is installed on the arc buffer board, arc push pedal slidable mounting is on fixed box, arc buffer board slidable mounting is on fixed box inner wall, the fixed air vent of having seted up on the arc buffer board.

Preferably, the inside knocking device that is provided with of elasticity gasbag, knocking device include the elastic metal piece, elastic metal piece fixed mounting is between arc buffer board and fixed incasement wall, elastic metal piece outer wall fixed mounting is in knocking the pole bottom, the pole that beats runs through and slidable mounting on fixed case, it has the ball to beat pole top fixed mounting, the ball top is close to dustproof filter setting, the pole that beats sets up inside the intake pipe.

A cutting method of a metal guard plate cutting machine for a printing machine in which a cutter is supported only on one side of a machine bed, comprising:

s1, when the shearing knife rotates anticlockwise to conduct shearing work, the angle between the shearing knife and the rotating plate is increased, the bottom of the rotating plate pushes the sliding plate to drive the baffle plate to slide leftwards along the L-shaped sliding groove through the sliding column, and the polishing rod can be driven to polish the shearing knife from right to left through the baffle plate and the attaching plate;

s2, when the rotating column drives the shearing knife to rotate anticlockwise, the rotating plate can be limited by the arc limiting plate and cannot rotate anticlockwise, so that the rotating plate and the polishing device are integrally suspended outside, and the rotating plate is prevented from being staggered with the sliding part of the L-shaped chute due to the action of gravity, so that the rotating plate can return to the initial position later;

s3, when the shearing knife rotates clockwise and is recombined with the sliding plate, the sliding column can reenter the L-shaped sliding groove and slide rightwards along the L-shaped sliding groove, and at the moment, air generates damping effect through the vent holes on the arc-shaped buffer plate to slow down the compression effect of the extruding column, so that impact damage generated by impact force of the extruding column and the shearing knife is relieved.

(III) beneficial effects

The invention provides a cutting machine tool and a cutting method for a metal guard plate of a printer, wherein a cutter is only supported on one side of a machine body. The beneficial effects are as follows:

(1) The metal guard plate shearing machine tool for the printer is characterized in that the cutter is only supported on one side of the machine body, the polishing device is arranged, when the shearing cutter rotates anticlockwise to conduct shearing work, the bottom of the rotating plate can push the sliding plate to drive the baffle plate to slide leftwards along the L-shaped sliding groove through the sliding column, the baffle plate can drive the attaching plate to conduct follow-up sliding, the attaching plate can drive the polishing rod to conduct polishing operation on the shearing cutter from right to left, the attaching plate can be clung to the outer wall of the shearing cutter through elastic action of the elastic sheet between the attaching plate and the baffle plate, polishing operation is conducted when the shearing cutter moves before shearing work, and shearing efficiency of the shearing cutter is improved.

(2) The cutter is only supported on one side of the lathe bed, and the limiting device is arranged in the supporting plate, so that when the rotating column drives the shearing cutter to rotate anticlockwise, the rotating column can drive the steering column and the rotating drum to rotate along with each other through the transmission belt, the rotating drum can drive the arc limiting plate to rotate anticlockwise through the connecting rod so as to rotate the top of the rotating plate, limiting supporting operation is provided when the rotating plate is tangent to the maximum position of the arc limiting plate, and the rotating plate is prevented from being staggered with the sliding part of the L-shaped chute due to the action of gravity.

(3) The metal guard plate shearing machine tool and the shearing method for the printer, wherein the cutter is only supported on one side of the machine body, and by the aid of the elastic device, when the shearing cutter rotates clockwise to return to the initial position, the extrusion column on the sliding plate can be extruded by the shearing cutter, the extrusion column can compress the elastic air bag, air is generated by compression of the elastic air bag, and the outer wall of the shearing cutter is cleaned.

(4) According to the metal guard plate shearing machine tool and the metal guard plate shearing method for the printing machine, the cutter is only supported on one side of the machine body, and the vibration protruding blocks are arranged on the outer wall of the shearing cutter, so that when the sliding plate drives the breast board to slide on the outer wall of the shearing cutter, the air blowing pipe can be intermittently extruded and swung by the vibration protruding blocks, the air blowing pipe can swing to improve the air blowing range, and meanwhile, the air blowing pipe can self-shake to conduct dust removal operation.

(5) The cutter is only supported on one side of the machine body, and the buffer device is arranged on the cutter, when the cutter rotates clockwise and is recombined with the sliding plate, the elastic air bag is compressed by the extrusion column to deform, the inside of the elastic air bag can push the arc push plate to drive the arc buffer plate to slide on the inner wall of the fixed box, the air generates damping effect through the vent holes on the arc buffer plate to slow down the compression effect of the extrusion column, so that impact damage generated by impact force of the extrusion column and the cutter is reduced, and meanwhile, the deformation of the elastic metal sheet drives the knocking rod and the ball to knock the dust-proof filter plate to perform vibration dust removal operation.

Drawings

FIG. 1 is a schematic diagram of the overall front exterior structure of the present invention;

FIG. 2 is a schematic diagram showing the external structure of the shearing blade in front view;

FIG. 3 is a schematic view of the rear view of the exterior part of the skateboard of the present invention;

FIG. 4 is a schematic view showing the internal partial structure of the support plate according to the present invention;

FIG. 5 is an enlarged schematic view of the structure A of FIG. 4 according to the present invention;

FIG. 6 is a schematic view of the exterior partial structure of the elastic balloon of the present invention in elevation;

FIG. 7 is a right side view of the elastic balloon of the present invention showing the internal partial structure;

FIG. 8 is a schematic cross-sectional view of a shear blade according to the present invention.

In the figure: 1. a support plate; 21. a rotating plate; 22. a slide plate; 23. a breast board; 24. bonding plates; 25. polishing the rod; 26. a spool; 27. an L-shaped chute; 3. a shearing knife; 41. rotating the column; 42. a drive belt; 43. a steering column; 44. a rotating drum; 45. a connecting rod; 46. an arc limiting plate; 47. semicircular convex blocks; 5. a round hole; 51. an elastic air bag; 52. an extrusion column; 53. an air blowing pipe; 54. vibrating the bump; 55. an air inlet pipe; 56. a dust-proof filter plate; 61. an arc push plate; 62. a fixed box; 63. an arc-shaped buffer plate; 64. a vent hole; 71. an elastic metal sheet; 72. knocking the rod; 73. a ball.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Referring to fig. 1-8, the present invention provides a technical solution: the utility model provides a cutter only is supported the printing press metal backplate shearing lathe in lathe bed one side, including backup pad 1 and shearing sword 3, shearing sword 3 fixed mounting is on rotating post 41, rotating post 41 can realize clockwise rotation and anticlockwise rotation through external staff control, rotating post 41 rotates and installs on backup pad 1, be provided with grinding device on shearing sword 3, grinding device includes rotating plate 21, rotating plate 21 top rotation installs on backup pad 1 outer wall, rotating plate 21 bottom rotation installs in slide 22 top, slide 22 bottom fixed mounting has sideboard 23, sideboard 23 bottom rotation installs bonding board 24, through shell fragment elastic connection between bonding board 24 outer wall and the sideboard 23 outer wall, the one end fixed mounting who is close to shearing sword 3 outer wall of bonding board 24 has polishing stick 25, the sideboard 24 bottom sets up to the arcwall, the fixed L type spout 27 that has seted up on the shearing sword 3, the one end fixed mounting that sideboard 23 is close to shearing sword 3 has slide post 26, slide mounting in L type spout 27, through being provided with grinding device, when shearing sword 3 anticlockwise rotation carries out the shearing work, sideboard 24 drives the operation 25 and makes the sideboard that polishes with the shearing sword 3 through the shell fragment elastic connection between the side of shearing board 3, can make the operation before the shearing board 3 is attached to the shearing operation on the shearing board 3, the shearing board is carried out the operation is carried out in the side of the shearing board 3.

As shown in fig. 2, 4, 5 and 6, in the present invention, a limiting device is provided in a support plate 1, the limiting device includes a driving belt 42, the bottom of the driving belt 42 is fixedly installed on the outer wall of a rotating column 41, a steering column 43 is rotatably installed on the outer wall of the support plate 1, a rotating drum 44 is rotatably installed on the outer wall of the support plate 1, the rotating column 41, the steering column 43 and the rotating drum 44 are in transmission connection through the driving belt 42, a connecting rod 45 is fixedly installed on the outer wall of the rotating drum 44, one end of the connecting rod 45 far away from the rotating drum 44 is fixedly installed with an arc limiting plate 46, a semicircular bump 47 is fixedly installed on the outer wall of the arc limiting plate 46, a cavity for the arc limiting plate 46 to rotate is fixedly provided on the support plate 1, the driving belt 42 penetrates and is slidably installed on the arc limiting plate 46, a round hole 5 is fixedly provided on the sliding plate 22, an elastic device is provided on the rotating plate 21, the elastic device comprises an elastic air bag 51, the elastic air bag 51 is fixedly arranged on a rotating plate 21, an extrusion column 52 is fixedly arranged on the outer wall of the bottom of the elastic air bag 51, the extrusion column 52 is movably arranged in a round hole 5, an air blowing pipe 53 is fixedly arranged at the air outlet end of the bottom of the elastic air bag 51, the bottom of the air blowing pipe 53 is close to the outer wall of a shearing knife 3, a vibration bump 54 is fixedly arranged on the outer wall of the shearing knife 3, an air inlet pipe 55 is fixedly arranged at the air inlet end of the elastic air bag 51, a dustproof filter plate 56 is fixedly arranged at the top of the air inlet pipe 55, when the rotating column 41 drives the shearing knife 3 to rotate anticlockwise, the rotating drum 44 can drive the arc limiting plate 46 to rotate anticlockwise through a connecting rod 45 to rotate the top of the rotating plate 21, and limited supporting operation is provided when the rotating plate 21 is tangential with the maximum position of the arc limiting plate 46, preventing the turning plate 21 from being staggered from the sliding position of the L-shaped chute 27 due to the action of gravity.

As shown in fig. 6 and 7, in the present invention, the buffer device is disposed inside the elastic air bag 51, the buffer device includes an arc push plate 61, one end of the arc push plate 61 is rotatably mounted on the inner wall of the elastic air bag 51, the other end of the arc push plate 61 is rotatably mounted on an arc buffer plate 63, the arc push plate 61 is slidably mounted on a fixed box 62, the arc buffer plate 63 is slidably mounted on the inner wall of the fixed box 62, a vent 64 is fixedly disposed on the arc buffer plate 63, the elastic air bag 51 is internally provided with a knocking device, the knocking device includes an elastic metal sheet 71, the elastic metal sheet 71 is fixedly mounted between the arc buffer plate 63 and the inner wall of the fixed box 62, the outer wall of the elastic metal sheet 71 is fixedly mounted at the bottom of a knocking rod 72, the knocking rod 72 penetrates and is slidably mounted on the fixed box 62, a ball 73 is fixedly mounted at the top of the knocking rod 72, the top of the ball 73 is disposed near the dust-proof 56, the knocking rod 72 is disposed inside the air inlet pipe 55, when the cutter 3 is clockwise rotated to be recombined with the slide plate 22, the vent 64 on the arc buffer plate 63 is fixedly provided with the buffer device, the air is damped through the vent 64 on the arc buffer plate 63, so as to reduce the compression effect of the squeeze column 52, thereby reducing the impact effect of the squeeze column 52, and the knocking force of the dust-proof column 72 is reduced, and the knocking force of the dust-proof column 72 is simultaneously, and the knocking rod 72 is caused by the elastic metal sheet 72.

Example 2

Referring to fig. 1-8, the present embodiment provides a cutting method for a metal guard plate cutting machine of a printing machine, in which a cutter is supported only on one side of a machine body, comprising:

Based on the above embodiment, the working process of the invention is that when the shearing knife 3 rotates anticlockwise to perform shearing work, the angle between the shearing knife 3 and the rotating plate 21 is increased, the joint of the bottom of the rotating plate 21 and the shearing knife 3 can rotate anticlockwise along the shearing knife 3, so that the distance between the shearing knife 3 and the rotating plate 21 is increased, the rotating plate 21 rotates anticlockwise for compensating the shearing knife 3 by an increased distance, the bottom of the rotating plate 21 slides along the shearing knife 3 to the outside of the shearing knife 3, the sliding plate 22 can be pushed by the bottom of the rotating plate 21 to drive the baffle plate 23 to slide leftwards along the L-shaped chute 27 through the sliding column 26, the baffle plate 23 can drive the attachment plate 24 to slide along the sliding column 24, the attachment plate 24 can drive the polishing rod 25 to polish the shearing knife 3 from right to left, the attachment plate 24 can be attached to the outer wall of the shearing knife 3 through elastic action between the attachment plate 24 and the baffle plate 23, the polishing operation is performed during the movement of the shearing knife 3 before the shearing knife 3, the shearing device improves the shearing efficiency of the shearing knife 3, when the shearing knife 3 rotates anticlockwise until the sliding column 26 slides to the L-shaped chute 27 to the leftwards end 27, the end of the sliding plate 25 can be separated from the entire body and the shearing device is completely polished, and the entire body can be detached from the sliding plate 23 is completely from the sliding plate 23, and the shearing device is completely polished after the polishing operation is completed; through being provided with the restriction device in backup pad 1, when the spliced pole 41 drives shearing blade 3 anticlockwise to rotate, the spliced pole 41 passes through drive belt 42 alright drive steering column 43 and rotary drum 44 and follows the rotation, rotary drum 44 alright pass through connecting rod 45 and drive arc limiting plate 46 anticlockwise rotation will rotate the top of rotating plate 21, and provide the restriction support operation when rotating plate 21 and arc limiting plate 46 biggest position department are tangent, this position just is the position of rotating plate 21 when the strut 26 breaks away from with L type spout 27, make rotating plate 21 can not anticlockwise rotation by arc limiting plate 46, form rotating plate 21 and grinding device whole to be unsettled outside, prevent rotating plate 21 and the slip department of L type spout 27 stagger because of gravity, so that follow-up returns to the initial position, through being provided with elastic device, when cutting blade 3 clockwise rotation returns to the initial position, the extrusion post 52 on slide 22 can be extruded by shearing blade 3, extrusion post 52 can compress the operation to elastic air bag 51, elastic air bag 51 compresses and produces the air current and blows through air pipe 53, it is clear up the outer wall of shearing blade 3 to shake the vibration of the vibration box 53 when the vibration of the vibration box 23 is provided with at the side of the vibration box 3, when the vibration box 53 is produced by the vibration of the vibration box 53, the vibration box 53 is swung in the vibration range of the vibration box is made to be produced by the vibration box 53, the vibration box 53 is produced when the vibration box is provided with the vibration box 53 is in the vibration; through being provided with buffer, when shearing sword 3 clockwise rotation and slide 22 are recombined, slide post 26 can reenter L type spout 27 and slide to the right along L type spout 27, extrusion post 52 compression elasticity gasbag 51 produces deformation this moment, inside alright promotion arc push pedal 61 of elasticity gasbag 51 drives arc buffer board 63 and slides on the inner wall of fixed case 62, the air produces damping effect that the damping was used for slowing down extrusion post 52 through the air vent 64 on arc buffer board 63, thereby alleviate the impact damage that extrusion post 52 and shearing sword 3's impact produced, simultaneously arc buffer board 63 slides and makes elastic metal sheet 71 produce deformation, the deformation alright drive of elastic metal sheet 71 strikes pole 72 and ball 73 and beats vibration dust removal operation to dustproof filter plate 56, in sum, through being provided with grinding device, when shearing sword 3 anticlockwise rotates and polishes the operation to shearing sword 3, paste the cutter 24 alright drive and polish the stick 25, and polish operation to shearing sword 3 from the right left, and paste the shell fragment elastic action between paste board 24 and breast plate 23 makes paste the laminating board 24 and can hug closely on shearing sword 3 outer wall, the shearing sword 3, the shearing efficiency before the shearing operation is carried out in the motion, the shearing operation is improved.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A metal guard plate shearing machine tool for a printing machine, in which a cutter is supported only on one side of a machine bed, comprising a support plate (1) and a shearing knife (3), characterized in that: the utility model provides a shearing knife (3) fixed mounting is on rotating post (41), rotating post (41) rotate and install on backup pad (1), be provided with grinding device on shearing knife (3), grinding device includes rotating board (21), rotating board (21) top rotates and installs on backup pad (1) outer wall, rotating board (21) bottom rotates and install in slide (22) top, slide (22) bottom fixed mounting has breast board (23), breast board (23) bottom rotates and installs laminated board (24), through shell fragment elastic connection between laminated board (24) outer wall and breast board (23) outer wall, one end fixed mounting that laminated board (24) are close to shearing knife (3) outer wall has stick of polishing (25).

2. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as claimed in claim 1, wherein: an L-shaped chute (27) is fixedly formed in the shearing knife (3), a sliding column (26) is fixedly mounted at one end, close to the shearing knife (3), of the breast board (23), and the outer wall of the sliding column (26) is slidably mounted in the L-shaped chute (27).

3. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as claimed in claim 1, wherein: the inside restriction device that is provided with of backup pad (1), restriction device include driving belt (42), driving belt (42) bottom fixed mounting is on rotating column (41) outer wall, rotate on backup pad (1) outer wall and install steering column (43), rotate on backup pad (1) outer wall and install rotary drum (44), be connected through driving belt (42) transmission between rotating column (41), steering column (43) and rotary drum (44).

4. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as claimed in claim 3, wherein: the rotary drum is characterized in that a connecting rod (45) is fixedly installed on the outer wall of the rotary drum (44), one end, away from the rotary drum (44), of the connecting rod (45) is fixedly provided with an arc limiting plate (46), a semicircular lug (47) is fixedly installed on the outer wall of the arc limiting plate (46), a cavity for the arc limiting plate (46) to rotate is fixedly formed in the supporting plate (1), and the driving belt (42) penetrates through and is slidably installed on the arc limiting plate (46).

5. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as claimed in claim 1, wherein: round holes (5) are fixedly formed in the sliding plate (22), elastic devices are arranged on the rotating plate (21) and comprise elastic air bags (51), the elastic air bags (51) are fixedly mounted on the rotating plate (21), extrusion columns (52) are fixedly mounted on the outer walls of the bottoms of the elastic air bags (51), and the extrusion columns (52) are movably mounted inside the round holes (5).

6. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as defined in claim 5 wherein: the air blowing pipe (53) is fixedly arranged at the air outlet end of the bottom of the elastic air bag (51), the bottom of the air blowing pipe (53) is close to the outer wall of the shearing knife (3), the vibration protruding block (54) is fixedly arranged on the outer wall of the shearing knife (3), the air inlet end of the elastic air bag (51) is fixedly provided with the air inlet pipe (55), and the top of the air inlet pipe (55) is fixedly provided with the dustproof filter plate (56).

7. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as defined in claim 6, wherein: the inside buffer that is provided with of elastic air bag (51), buffer includes arc push pedal (61), arc push pedal (61) one end is rotated and is installed on elastic air bag (51) inner wall, arc push pedal (61) other end is rotated and is installed on arc buffer board (63), arc push pedal (61) slidable mounting is on fixed case (62), arc buffer board (63) slidable mounting is on fixed case (62) inner wall, fixed air vent (64) of having seted up on arc buffer board (63).

8. A metal guard plate shearing machine for printing presses having a cutter supported only on one side of the bed as defined in claim 7, wherein: the utility model discloses a novel air conditioner, including fixed box (55) and fixed box, including fixed box (62) and fixed box (55) and fixed box, elastic air bag (51) inside is provided with the knocking device, and the knocking device includes elastic metal sheet (71), elastic metal sheet (71) fixed mounting is between arc buffer board (63) and fixed box (62) inner wall, elastic metal sheet (71) outer wall fixed mounting is in knocking pole (72) bottom, knocking pole (72) run through and slidable mounting on fixed box (62), knocking pole (72) top fixed mounting has ball (73), ball (73) top is close to dustproof filter board (56) setting, knocking pole (72) set up inside intake pipe (55).

9. A method of shearing a metal guard of a printing press having a cutter supported only on one side of a bed, comprising:

s1, when the shearing knife (3) rotates anticlockwise to conduct shearing work, the angle between the shearing knife (3) and the rotating plate (21) is increased, the bottom of the rotating plate (21) pushes the sliding plate (22) to drive the breast board (23) to slide leftwards along the L-shaped sliding groove (27) through the sliding column (26), and the polishing rod (25) can be driven to polish the shearing knife (3) from right to left through the breast board (23) and the attaching plate (24);

s2, when the rotating column (41) drives the shearing knife (3) to rotate anticlockwise, the rotating plate (21) can be limited by the arc limiting plate (46) and cannot rotate anticlockwise, so that the rotating plate (21) and the polishing device are integrally suspended outside, and the sliding position of the rotating plate (21) and the L-shaped chute (27) is prevented from being staggered due to the action of gravity, so that the initial position is returned later;

s3, when the shearing blade (3) rotates clockwise to be recombined with the sliding plate (22), the sliding column (26) can reenter the L-shaped sliding groove (27) and slide rightwards along the L-shaped sliding groove (27), and at the moment, air generates damping effect through the vent holes (64) on the arc-shaped buffer plate (63) to slow down the compression effect of the extruding column (52), so that impact damage generated by impact force between the extruding column (52) and the shearing blade (3) is relieved.