CN110103569B

CN110103569B - Curved surface offset press for large-basin printing

Info

Publication number: CN110103569B
Application number: CN201910354583.0A
Authority: CN
Inventors: 易心元
Original assignee: Hubei Tianqiao Machinery Air Blower Co ltd
Current assignee: Hubei Tianqiao Machinery Air Blower Co ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-11-13
Anticipated expiration: 2039-04-29
Also published as: CN110103569A

Abstract

The invention provides a curved surface offset press for large basin printing.A feeding mechanism is used for conveying a large basin in the horizontal direction and adjusting the relative position of a feeding main frame body and a feeding hole of an indexer; the dividing mechanism is used for conveying the large basin transmitted by the feeding mechanism to the printing mechanism for offset printing and then transferring the large basin to the discharging mechanism; the discharging mechanism is used for obliquely and downwards outputting the offset-printed large basin. The large basin is conveyed in the horizontal direction through the feeding mechanism, the discharging mechanism is obliquely arranged below the feeding hole of the graduator and is used for obliquely and downwards outputting the large basin after offset printing, the feeding and discharging problems of large basin printing are solved, meanwhile, the hanging structure can conveniently and accurately realize the installation and the disassembly of the printing plate, the problems of creeping, loosening and falling of the printing plate generated by high-speed operation can be effectively solved, and the disassembly times of the large basin printing roller are reduced.

Description

Curved surface offset press for large-basin printing

Technical Field

The invention belongs to the technical field of printing machinery, and particularly relates to a curved surface offset press for large-basin printing.

Background

Flexographic offset presses generally include an indexer and a printing device. The cup mold comprises a cup mold mandrel and a cup mold body, wherein the lower part of the cup mold mandrel is positioned in the cup mold mounting hole and is fixed on the indexing turntable, and the cup mold body is arranged on the upper part of the cup mold mandrel through a bearing. The index plate usually has a print-receiving-member feeding station, in which the feed mechanism sleeves the print-receiving member on the cup mold, a printing station, and a print-receiving-member ejecting station, after which the index plate sequentially feeds the cup mold and the print-receiving member sleeved thereon to the stations and performs the corresponding processes, and finally, at the print-receiving-member ejecting station, the print-receiving member that has completed printing is ejected from the cup mold.

In the existing curved surface offset press for printing small-sized printing workpieces, a feeding mechanism usually feeds materials in a lifting or climbing feeding mode, and the large basin is heavy in weight and large in size during printing and is not suitable for lifting feeding modes such as a tower frame, the existing mode is not suitable for feeding materials in an inclined downward direction and is influenced by the weight of the bulk products, the large basin is too large in size, the large basin is not easy to bend after being formed into a cylinder, a guide cage or a turnover plate required after being formed into the cylinder is too large, the feeding is not stable enough and the feeding is easy to incline and slide, and the existing feeding mechanism can not adjust the relative position of a feeding frame and a feeding hole of an indexer; meanwhile, in the existing curved surface offset press for printing small-sized printing workpieces, the discharging mechanism usually discharges materials in a horizontal mode, and the discharging mechanism is influenced by the dead weight of batch products due to the dead weight and large volume of a large basin during printing, and the reserved space between the graduator and the printing device is limited.

In addition, the printing plate of the curved offset press is generally installed on the plate roller through a plate hanging device, the printing quality of the curved offset press is greatly related to the clinging degree of the printing plate on the plate roller, and after the existing printing plate is installed on the plate roller, due to the problem of the hanging mode, in the using process, along with the high-speed running of the plate roller, the problems of plate creeping, plate loosening, plate position deviation, plate deflection or plate falling often occur, so that the printing quality is influenced, the plate is seriously damaged even, and when the printing plate is installed and the plate is changed, sometimes even the printing roller needs to be detached for debugging, compared with the printing roller of the common small-sized printing workpiece, the printing roller for the large basin has too large size, volume and self weight, and the assembly and disassembly of the printing plate are time-consuming and labor-consuming, so that the working time and difficulty during plate replacement are increased, and the working efficiency cannot be effectively improved.

Therefore, a new curved offset printing machine is urgently needed to solve the problem of large-basin printing.

Disclosure of Invention

The invention aims to provide a curved surface offset press for large-basin printing, which conveys a large basin in the horizontal direction through a feeding mechanism and adjusts the relative position of a feeding main frame body and a feeding hole of an indexer, a hanging device is arranged in a hanging plate groove of a printing roller and is used for hanging and installing a printing plate on the printing roller, a discharging mechanism is obliquely arranged below the feeding hole of the indexer and is used for obliquely outputting the large basin after offset printing downwards, and the size of a discharging channel of the discharging mechanism and the relative position of the discharging channel and a discharging station of the indexer can be adjusted, so that the problems in the prior art can be effectively solved.

In order to achieve the aim, the invention provides a curved surface offset press for large-basin printing, which comprises a feeding mechanism with a feeding main frame body, an indexing mechanism with an indexer feeding hole and an indexer discharging station, a printing mechanism and a discharging mechanism, wherein the feeding mechanism is used for conveying a large basin in the horizontal direction and adjusting the relative position of the feeding main frame body and the indexer feeding hole; the printing mechanism comprises a large transfer printing drum, various color printing roller assemblies and printing ink units, wherein the various color printing roller assemblies and the printing ink units are matched with the large transfer printing drum, each printing roller assembly comprises a printing roller, a hanging device and a printing plate, a hanging plate groove is formed in each printing roller, the hanging device is arranged on the hanging plate groove of each printing roller, the printing plate is arranged on each printing roller through the hanging device, and each hanging device comprises a hanging structure arranged on the hanging plate groove and a plate frame adjusting seat structure for fixing the hanging structure on the hanging plate groove; the hanging structure comprises a first fixed plate-pulling frame, a second fixed plate-pulling frame, a plurality of top pins and a plurality of plate-hanging pins which are arranged on the first fixed plate-pulling frame and the second fixed plate-pulling frame, and an eccentric cam component; the ejector pin is an elastic component, a plurality of ejector pin mounting holes are correspondingly formed in the first fixed plate-pulling frame and the second fixed plate-pulling frame along the tangential direction of the plate roller, and the ejector pin penetrates through the first fixed plate-pulling frame through the ejector pin mounting holes and is embedded into the second fixed plate-pulling frame; the contact surface of the first fixed plate pulling frame and the second fixed plate pulling frame is provided with a special-shaped groove, the eccentric cam component is arranged between the first fixed plate pulling frame and the second fixed plate pulling frame through the special-shaped groove, and the first fixed plate pulling frame and the second fixed plate pulling frame are separated and closed along the ejector pin along with the loosening and tightening of the eccentric screw component; the first fixed plate-pulling frame and the second fixed plate-pulling frame are respectively provided with a plurality of plate-hanging pin mounting holes along the radial direction of a plate roller, the printing plate is correspondingly provided with a plurality of plate-hanging pin mounting holes, and when the first fixed plate-pulling frame and the second fixed plate-pulling frame are closed tangentially, the plate hanging is fixed on the first fixed plate-pulling frame and the second fixed plate-pulling frame through the plate-hanging pins; the plate frame adjusting seat assembly is used for fixing the first fixed plate pulling frame and the second fixed plate pulling frame on the plate hanging groove; the dividing mechanism is used for conveying the large basin transmitted by the feeding mechanism to the printing mechanism for offset printing and then transferring the large basin to the discharging mechanism; the discharging mechanism is obliquely arranged below the feeding hole of the indexer and is used for obliquely and downwards outputting the offset-printed large basin, and the size of a discharging channel of the discharging mechanism and the relative position of the discharging channel and a discharging station of the indexer are adjusted.

Preferably, eccentric cam subassembly includes from last screw rod connecting piece, cam step and the cam base that sets gradually down, version roller in dysmorphism slot below is equipped with a holding hole, the cam base is located in the holding hole, the cam step is eccentric circle structure, its joint set up in the dysmorphism slot, screw rod connecting piece is used for installing the screw rod.

Preferably, the eccentric cam assembly further comprises a shaft sleeve, and the shaft sleeve is embedded in the containing hole of the plate roller and is used for assisting in fixing the eccentric cam assembly on the plate roller.

Preferably, the chase adjustment seat subassembly includes at least a set of chase adjustment seat, the chase adjustment seat with first fixed chase holder of pulling the correspondence of chase junction is equipped with the step, just the chase adjustment seat first fixed chase holder of pulling the correspondence of chase holder is equipped with the mounting hole to the second is fixed chase holder of pulling, the chase adjustment seat via the step cooperation is pushed down first fixed chase holder of pulling with behind the second fixed chase holder, via the mounting hole will articulate the structure whole and be fixed in on the version roller.

Preferably, the hanging device further comprises two groups of inlaid strips fixedly arranged on two side walls of the hanging plate groove, the hanging structure is arranged between the two groups of inlaid strips, and the two groups of inlaid strips are used for limiting the hanging structure;

and/or the hanging device further comprises an embedding assembly, the embedding assembly comprises an embedding sleeve and a screw rod in threaded connection with the embedding sleeve, the first fixed drawing plate frame and the printing roller are respectively provided with a mounting hole corresponding to the embedding sleeve, and the embedding assembly is fixed on the printing roller after penetrating through the first fixed drawing plate frame;

and/or, hooking device articulate the structure and still include a plurality of uide pins, first fixed plate frame of drawing with the second is fixed to draw the plate frame to correspond along version roller tangential direction and has opened a plurality of uide pin mounting holes, and is a plurality of the uide pin runs through first fixed plate frame of drawing with the second is fixed to draw the plate frame setting.

Preferably, the feeding mechanism comprises a feeding main frame body and a front-back adjusting part arranged on the feeding main frame body; the front and back adjusting part comprises lifting support plates arranged on the front and back sides of the feeding main frame body, a workbench which is arranged on the two lifting support plates in a spanning manner and is arranged horizontally, two supports which are arranged on the two opposite sides of the workbench in a spanning manner and are arranged on the two lifting support plates in parallel, the brackets are all provided with a first slide rail, the first slide rail is at least provided with a slide block, the slide block is fixedly connected with a frame body connecting plate, the frame body connecting plate is fixedly connected with the workbench, the bracket is provided with a power assembly for the slide block to move linearly, the power assembly is provided with an output screw rod which is connected with a clamping fixing piece in a sliding way, the clamping fixing pieces extend to two opposite sides of the workbench and are fixedly connected with the workbench so as to drive the workbench to adjust the front and rear positions through the rotation of the output screw; and the support is also covered with a cover plate, and the top surface of the cover plate is flush with the workbench so as to feed the printing piece stably.

Preferably, the feeding mechanism further comprises an upper and lower adjusting part arranged on the feeding main frame body; the upper and lower adjusting part comprises push rod mounting plates which are arranged on upright posts on two opposite sides of the feeding main frame body and are transversely arranged, an electric push rod is arranged on the push rod mounting plates, the electric push rod penetrates through the top of the feeding main frame body and is fixedly connected with the lifting support plate, passive telescopic parts are respectively arranged at two ends between the lifting support plate and the top of the feeding main frame body, and the tops of the passive telescopic parts are fixed on the lifting support plate through an end cover so as to adjust the height of the workbench through the electric push rod; preferably, the passive telescopic part comprises a linear bearing sleeved in the feeding main frame body, a chromium-plated optical axis arranged in the linear bearing in a sliding manner, and a limiting part for preventing the chromium-plated optical axis from sliding out of the linear bearing.

Preferably, the first slide rail is arranged on one side of the top of the support, the other side of the top of the support is also provided with a second slide rail, the second slide rails are respectively provided with at least one passive slide block, the passive slide blocks are fixedly connected with a frame body connecting plate, and the frame body connecting plate is fixedly connected with the workbench to enable the workbench to stably slide back and forth;

and/or the power assembly is of a screw rod structure, and the screw rod structure comprises a motor, a coupler and an output screw rod which are sequentially connected; the motor fixing seats comprise hanging plates arranged at the bottoms of the two brackets in a spanning mode, temple plates respectively arranged on two opposite sides of the hanging plates and extending towards the direction vertical to the ground, and a motor bearing plate arranged between the two temple plates and the hanging plates, and the motor bearing plate is fixedly connected with the motor; the inner side surfaces of the two side supporting plates are respectively provided with a chute guide rail, the outer side of the motor protective cover corresponding to the two chute guide rails is provided with a connecting strip, and the inner wall surface of the motor protective cover is respectively provided with a noise reduction surface with an irregular shape;

and/or printing part enclosing guardrails are arranged on the outer side surfaces of the two cover plates, each printing part enclosing guardrail comprises a plurality of guardrail adjusting brackets arranged on the outer side surfaces of the cover plates at intervals and guardrail strips transversely arranged on the guardrail adjusting brackets in a spanning manner, and the width of each two opposite guardrail strips corresponds to the diameter of each printing part; the guardrail adjusting support comprises a height adjusting seat connected with the outer side surface of the cover plate, a longitudinal adjusting rod in the height adjusting seat is vertically inserted in the height adjusting seat and is used for locking the height adjusting seat and a first knob of the longitudinal adjusting rod, an interval adjusting seat is arranged at the top end of the longitudinal adjusting rod, a transverse adjusting rod is transversely inserted in the interval adjusting seat and is fixedly connected with the guardrail strip and the longitudinal adjusting rod, and the transverse adjusting rod is used for locking the interval adjusting seat and a second knob of the transverse adjusting rod.

Preferably, the discharging mechanism comprises a cup collecting base with an inclined mounting surface, the cup collecting base is connected with a bearing platform in a sliding manner through a linear motion screw rod assembly so as to drive the bearing platform to move up and down along the inclined mounting surface through the motion of the linear motion screw rod assembly, two parallel synchronous belt wheel assemblies with opposite conveying surfaces are arranged on the bearing platform, and a printing workpiece clamping and conveying channel for obliquely and downwardly discharging a printing workpiece is formed between the conveying surfaces of the two synchronous belt wheel assemblies; the bearing platform is also provided with two opposite movement screw rod assemblies for the opposite or reverse movement of the synchronous pulley assemblies, and the opposite movement screw rod assemblies drive the two synchronous pulley assemblies to move oppositely so as to adjust the width of the clamping and conveying channel of the printing workpieces corresponding to the size of the printing workpieces.

Preferably, the linear motion screw rod assembly comprises an adjusting screw rod arranged on the left side and the right side of the parallel inclined mounting surface, a first adjusting power piece arranged at the end part of the adjusting screw rod, a thrust ball bearing and a round nut which are arranged on the adjusting screw rod and are positioned on one side of the first adjusting power piece, and an adjusting nut which is arranged on the adjusting screw rod in a sliding manner, wherein the adjusting nut is fixedly connected with the bearing platform;

and/or the opposite movement screw rod assembly comprises an adjusting screw rod arranged on the front side and the rear side of the parallel inclined mounting surface, the adjusting screw rod is arranged on the supporting seat, a second adjusting power piece is arranged at the end part of the adjusting screw rod, and a left-handed adjusting nut and a right-handed adjusting nut are slidably arranged on the adjusting screw rod and are respectively connected with a corresponding synchronous pulley assembly so as to drive the corresponding synchronous pulley assembly to do relative movement;

and/or the synchronous pulley component comprises a cup-receiving synchronous belt seat arranged on the bearing platform, a servo motor, a synchronous belt and a synchronous wheel arranged on the cup synchronous belt seat; the synchronous belt assembly further comprises a tension pulley and a guide wheel which is matched with the tension pulley to clamp the synchronous belt, so that the tightness of the synchronous belt is adjusted through the tension pulley;

and/or a printing workpiece diversion frame is further arranged on the cup receiving base and comprises two diversion rods which are used for supporting the bottom of the printing workpiece and are arranged at intervals and two pressing rods which are pressed on the top of the printing workpiece and are arranged at intervals, and the tail ends of the two diversion rods are arranged in an upward inclined mode so as to buffer the falling printing workpiece.

According to the curved surface offset press for large basin printing provided by the invention, the feeding mechanism is used for conveying a large basin in the horizontal direction and adjusting the relative position of the feeding main frame body and the feeding hole of the indexer, and the large basin has large dead weight and volume and is not suitable for lifting a feeding mode such as a tower frame. Indexing mechanism is used for transmitting the big basin of feed mechanism transmission to discharge mechanism after the offset printing of printing mechanism, printing mechanism is used for carrying out the offset printing to the big basin of indexing mechanism transmission, discharge mechanism locates the below of graduator feed inlet in the slope, supply in the big basin after the oblique downward output offset printing, and adjust discharge mechanism's discharging channel's size and discharging channel and the relative position of graduator ejection of compact station, because of big basin dead weight and volume are great during big basin printing, it is limited to add between graduator and printing device reserve space, current horizontal mode ejection of compact receives the influence of batch product dead weight, and the too big volume of big basin leads to carrying out the horizontal ejection of compact in the finite space, consequently, the ejection of compact problem of compact of big basin printing has been solved to the downward discharge mechanism that sets up of slope. When the plate is hung and installed or changed, firstly, the eccentric cam component is loosened, each knock-pin is in a compression state under the drive of the eccentric cam component, the first fixed plate-pulling frame and the second fixed plate-pulling frame are separated along the knock-pin tangential direction, two rows of hanging plate pins positioned on the first fixed plate-pulling frame and the second fixed plate-pulling frame are relatively loosened, at the moment, the printing plate is preliminarily installed and fixed on the first fixed plate-pulling frame and the second fixed plate-pulling frame through the hanging plate pins, then, the eccentric cam component is screwed, at the moment, each knock-pin returns to the original natural state, the first fixed plate-pulling frame and the second fixed plate-pulling frame are closed along the knock-pin tangential direction, the printing plate reaches a designated position through the hanging plate pins, the first fixed plate-pulling frame and the second fixed plate-pulling frame, and the hanging plates are integrally fixed on the hanging plate groove through the plate frame adjusting seat component, namely completing the hanging of the printing plate on the printing roller; if the plate needs to be changed, the opposite steps are operated, so that the installation and the disassembly of the printing plate can be conveniently and accurately realized, meanwhile, after the printing plate surrounds a circle of the printing plate, the head end and the tail end of the printing plate are respectively fixed on the printing plate hanging device through a plurality of hanging plate pins, on one hand, the printing plate can be arranged close to the printing plate as far as possible through regulating and controlling the distance between the first fixed plate pulling frame and the second fixed plate pulling frame, on the other hand, the whole stress of the printing plate is uniform, and the problems of creeping, loosening, falling and the like caused by the high-speed operation of the printing plate can be effectively solved. Compared with a printing plate roller of a common small-sized printing workpiece, the printing plate roller matched with the hanging device has the advantages that the size, the volume and the self weight of the printing plate roller for a large basin are too large, the assembly and disassembly of the printing plate are time-consuming and labor-consuming, the number of times of disassembling the printing plate roller for the large basin can be effectively reduced by adjusting the printing plate through the hanging device, and the plate hanging efficiency of large basin printing is improved.

Drawings

FIG. 1 is a perspective view of one embodiment of a curved offset printing press for large-basin printing in accordance with the present invention;

FIG. 2 is a perspective view of a feed mechanism in a curved offset printing press for large-basin printing according to the present invention;

FIG. 3 is a perspective view of the feed mechanism of FIG. 2 without the cover plate installed;

FIG. 4 is a bottom view of FIG. 2;

FIG. 5 is a partial schematic structural view of the feeding mechanism of FIG. 2 with a print enclosure fence installed;

FIG. 6 is a schematic structural view of a plate hanging device in the curved offset printing machine for large-basin printing according to the present invention;

FIG. 7 is an exploded view of the plate hitch of the embodiment shown in FIG. 6;

FIG. 8 is a cross-sectional view taken along line B-B of the plate hitch of the embodiment shown in FIG. 6;

FIG. 9 is a schematic view of the mounting structure of the printing plate, the plate hitch and the plate roller;

FIG. 10 is a schematic structural diagram of a discharging mechanism in the curved offset printing machine for large-basin printing according to the present invention;

FIG. 11 is a schematic view of the discharge mechanism of FIG. 10 engaged with a print substrate;

fig. 12 is a schematic structural diagram of an embodiment of the discharging mechanism provided with a discharging guide bracket.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

FIG. 1 is a perspective view of one embodiment of a flexographic offset printing press for large-basin printing according to the present invention. As shown in fig. 1, the present invention provides a flexographic offset printing press for large-tub printing, comprising a feeding mechanism 400 having a feeding main frame 411, an indexing mechanism 600 having an indexer feed port 610 and an indexer discharge station 620, a printing mechanism 700, and a discharge mechanism 500. The feeding mechanism 400 is used for conveying large basins in the horizontal direction and adjusting the relative positions of the feeding main frame 411 and the indexer feeding hole 610, the indexing mechanism 600 is used for conveying the large basins transmitted by the feeding mechanism 400 to the printing mechanism 700 for offset printing and then transmitting the large basins to the discharging mechanism 500, the printing mechanism 700 comprises a large transfer printing drum, various color plate roller assemblies and ink units matched with the large transfer printing drum and used for offset printing of the large basins transmitted by the indexing mechanism, the discharging mechanism 500 is obliquely arranged below the indexer feeding hole 610 and used for obliquely and downwards outputting the large basins subjected to offset printing, and the size of a discharging channel 560 of the discharging mechanism 500 and the relative positions of the discharging channel 560 and the indexer discharging station 620 are adjusted.

Fig. 2 is a perspective view of a feeding mechanism in a curved offset printing press for large-basin printing according to the present invention, fig. 3 is a perspective view of the feeding mechanism without a cover plate in fig. 2, fig. 4 is a bottom view of fig. 2, and fig. 5 is a partial structural schematic view of the feeding mechanism in fig. 2 with a print enclosure fence installed. As shown in fig. 2 to 5, the feeding mechanism 400 includes a front-rear adjusting portion 410 and an up-down adjusting portion 420.

Wherein, the front and back adjustment portion 410 includes a feeding main frame body 411, the lifting support plates 412 are arranged on the front and back sides of the feeding main frame body 411, the worktable 413 which is arranged on the two lifting support plates 412 in a crossing manner and is horizontally arranged, the two opposite sides of the worktable 13 are respectively arranged on the two lifting support plates 412 in a crossing manner, the two supports 414 which are arranged on the two lifting support plates 412 in a parallel manner are respectively arranged on the supports 414, the first slide rails 415 are respectively provided with at least one slide block 416, the slide block 416 is fixedly connected with a frame connecting plate 417 on the slide block 416, the frame connecting plate 417 is fixedly connected with the worktable 413, the support 414 is provided with a power assembly 418 for the linear motion of the slide block 416, the power assembly is provided with an output screw 4182, the output screw is slidably connected with a clamping fixing member 419, the clamping fixing member 419 extends to the opposite sides of the worktable 13 and is fixedly connected with.

In this embodiment, the two brackets 414 are covered with a cover plate 430, and the top surfaces of the two cover plates 430 are flush with the workbench 413, so that the printing element 460 can be stably fed in the transportation channel formed by the workbench 413 and the cover plates 430, and the first slide rail 415 and the slide block 416 can be protected by covering the cover plates 430.

Further, the first slide rail 415 is disposed on one side of the top surface of the bracket 414, the second slide rail 441 is disposed on the other side of the top surface of the bracket 414, at least one driven slider 442 is disposed on each second slide rail 441, a frame connecting plate 417 is fixedly connected to each driven slider 442, and the frame connecting plate 417 is fixedly connected to the workbench 413. When power at a power component 418 can reach workstation 413 fore-and-aft operation demand, if all install power component 418 at support 414 bottom both ends, can increase the power consumption cost, if on extending to whole support 414 with first slide rail 415, can lead to the waste of slide rail material still to increase the load of whole mechanism simultaneously, and set up the slide rail segmentation into first slide rail 415 and the second slide rail 441 of discontinuity, when the power saving economizes on electricity material, can also realize the stable fore-and-aft slip of workstation 13.

In practical application, a height adjusting cushion block is arranged between the first slide rail 415 and the frame body connecting plate 417, so that the height of the cover plate parallel and level workbench 413 can be effectively guaranteed.

Furthermore, the power assembly 418 is a screw rod structure, the screw rod structure includes a motor 181, a coupling and an output screw 4182 which are connected in sequence, the output screw 4182 is driven by the motor 4181 to rotate to drive the clamping fixing member 419 to move back and forth, and finally the front and back adjustment of the working table 413 is realized.

In addition, the present embodiment has made a matched structural design for fixing and protecting the motor 4181, and the structure thereof is as follows, a motor fixing seat 4183 and a motor protection cover slidably connected with the motor fixing seat 4183 are spanned at the bottoms of the two brackets 414, the motor fixing seat 4183 includes a hanging plate spanned at the bottoms of the two brackets 414, temple plates respectively arranged at two opposite sides of the hanging plate and extending towards the direction perpendicular to the ground, a motor bearing plate arranged between the two temple plates and the hanging plate, and the motor bearing plate is fixedly connected with the motor 4181. The inner side surfaces of the two side supporting plates are respectively provided with a chute guide rail, the outer sides of the motor protective covers corresponding to the two chute guide rails are respectively provided with a connecting strip, and the inner wall surfaces of the motor protective covers are respectively provided with noise reduction surfaces with irregular shapes.

In practical application, the outer side surfaces of the two cover plates 430 are provided with the print-receiving enclosure guardrail 450, the print-receiving enclosure guardrail 450 comprises a plurality of guardrail adjusting brackets 451 arranged on the outer side surfaces of the cover plates at intervals and guardrail strips 452 transversely spanned on the guardrail adjusting brackets 451, and the width of the two opposite guardrail strips 452 corresponds to the diameter of the print-receiving member 460. The two sides of the printing piece are enclosed by the guardrail strips 452 on the two sides, so that the printing piece 460 can be effectively prevented from side turning and sliding, and meanwhile, the printing piece 460 can be guided to the feeding hole of the indexer. Further, the guardrail adjusting bracket 451 comprises a height adjusting base 4511 connected with the outer side surface of the cover plate 430, a longitudinal adjusting rod 4512 longitudinally inserted in the height adjusting base 4511, a first knob 4513 for locking the height adjusting base 4511 and the longitudinal adjusting rod 4512, a distance adjusting base 4514 arranged at the top end of the longitudinal adjusting rod 4512, a transverse adjusting rod 4515 transversely inserted in the distance adjusting base 514, the transverse adjusting rod 4515 fixedly connected with the guardrail bar 452 and perpendicular to the longitudinal adjusting rod 4512, and a second knob 4516 for locking the distance adjusting base 4514 and the transverse adjusting rod 4515. This support 451 is adjusted to guardrail has realized the altitude mixture control of guardrail strip 452, has still realized the interval adjustment of two relative guardrail strips 452, and the printing piece 460 size of adaptable not equidimension realizes high-efficient transmission.

In this embodiment, the vertical adjusting portion 420 includes a push rod mounting plate 421 disposed on the upright posts on two opposite sides of the feeding main frame body 11 and transversely disposed, an electric push rod 422 is disposed on the push rod mounting plate 421, the electric push rod 422 penetrates through the top of the feeding main frame body 411 and is fixedly connected to the lifting support plate 412, passive expansion pieces 423 are disposed at two ends between the lifting support plate 412 and the top of the feeding main frame body 411, and the top of the passive expansion pieces 423 is fixed on the lifting support plate 412 through an end cover 424, so as to adjust the height of the workbench through the electric push rod 422.

Further, the passive telescopic member 423 includes a linear bearing 4231 sleeved in the feeding main frame body, a chrome-plated optical axis 4232 slidably disposed in the linear bearing 4231, and a limiting member for preventing the chrome-plated optical axis from sliding out of the linear bearing. The chrome plating optical axis is selected, so that the friction coefficient between the linear bearing and the chrome plating optical axis can be effectively reduced, and the stable lifting of the lifting support plate is realized.

In feed mechanism 400, because of big basin dead weight and volume are great, unsuitable feeding methods such as promotion pylon, the oblique downward side feeding of current mode receives the influence of batch product dead weight, the volume of big basin is too big, and it is difficult to bend after the section of thick bamboo and required guide cage behind the section of thick bamboo or turn over the board too big, use current mechanism feeding not steady enough and the easy landing that inclines of feeding, so solved the feeding problem of big basin printing through horizontal feeding mode. The front and back adjustment of the workbench is realized through the front and back adjusting part, specifically, the output screw in the power assembly rotates to drive the clamping fixing piece on the output screw to linearly slide back and forth on the output screw, and the front and back positions of the workbench connected with the clamping fixing piece are adjusted. Still realized the altitude mixture control of workstation through upper and lower regulation portion, specifically speaking, promote the lifting support plate through electric putter and reciprocate, passive extensible member has realized the steady lift of lifting support plate along with electric putter's flexible passive height-adjusting, has further realized the quick alignment regulation of workstation and graduator feed inlet.

Fig. 6 is a schematic structural view of a printing plate hanging device in a curved offset printing press for large-basin printing according to the present invention, fig. 7 is an exploded structural view of the printing plate hanging device in the embodiment shown in fig. 6, fig. 8 is a sectional view taken along the direction B-B of the printing plate hanging device in the embodiment shown in fig. 6, and fig. 9 is a schematic structural view of the installation of a printing plate, the printing plate hanging device, and a printing roller. Referring to fig. 5 to 9, each printing roller assembly of the printing mechanism includes a printing roller 100, a hooking device and a printing plate 300, wherein the printing roller 100 is provided with a hanging plate groove 110, the hooking device is disposed on the hanging plate groove 110 of the printing roller, the printing plate 300 is mounted on the printing roller 100 via the hooking device, and the hooking device includes a hooking structure mounted on the hanging plate groove and a plate frame adjusting seat structure for fixing the hooking structure on the hanging plate groove. The hanging structure is used for hanging and installing the printing plate 300, and the plate frame adjusting seat 220 structure is used for integrally fixing the hanging structure on the plate hanging groove 110.

As shown in fig. 6, the hitch structure includes a first fixed pull frame 211, a second fixed pull frame 212, a plurality of knock pins 213 and a plurality of hitch pins 214 provided on the first fixed pull frame 211 and the second fixed pull frame 212, and an eccentric cam assembly. The knock-pin 213 is an elastic component, a plurality of knock-pin 213 mounting holes are correspondingly formed in the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 along the tangential direction (i.e. the Z direction in the figure) of the plate roller 100, the knock-pin 213 penetrates through the first fixed plate-pulling frame 211 via the knock-pin 213 mounting hole and then is embedded into the second fixed plate-pulling frame 212, namely, after penetrating through the first fixed plate-pulling frame 211, one end of each knock-pin 213 abuts against the plate-hanging groove 110, and the other end of each knock-pin 213 abuts against the knock-pin 213 mounting hole in the second fixed plate-pulling frame 212, so as to abut against the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 and adjust the tightness between the two fixed plate-pulling frames by matching with; the contact surface of the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 is provided with a special-shaped groove 215, the eccentric cam assembly is arranged between the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 through the special-shaped groove 215, the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 are separated and closed along the top pin 213 along with loosening and tightening of the eccentric cam assembly, when the eccentric cam assembly is loosened, each top pin 213 is in a compression state, the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 are separated along the tangential direction of the top pin 213, when the eccentric cam assembly is tightened, the top pin 213 is in a natural state, and the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 are closed along the tangential direction. Meanwhile, a plurality of plate hanging pin mounting holes are further formed in the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 in the radial direction (i.e., the direction Y shown in the drawing) of the plate roller 100, a plurality of plate hanging pin mounting holes are correspondingly formed in the printing plate 300, when the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 are driven by the eccentric cam assembly to be switched to be closed, the hanging plates are fixed on the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 through the plate hanging pins, and then the first fixed plate pulling frame 211, the second fixed plate pulling frame 212 and the hanging plates are integrally fixed on the plate hanging groove 110 through the plate frame adjusting seat 220 assembly.

When the hanging installation or the plate changing installation of the printing plate 300 is carried out, firstly, the eccentric cam component is loosened, each top pin 213 is in a compressed state under the driving of the eccentric cam component, the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 are separated along the tangential direction of the top pin 213, two rows of hanging plate pins positioned on the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 are relatively loosened, at the moment, the printing plate 300 is preliminarily installed and fixed on the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 through the hanging plate pins, then, the eccentric cam component is screwed, at the moment, each top pin 213 restores the original natural state, the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 are closed along the tangential direction of the top pin 213, the printing plate 300 reaches a designated position through the hanging plate pins, the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 and the whole hanging plate are fixed on the plate-hanging groove 110 through the plate-adjusting seat 220 component, namely, the hanging of the printing plate 300 on the plate roller 100 is completed; if the plate needs to be changed, the opposite steps are carried out, so that the printing plate 300 can be conveniently and accurately mounted and dismounted, meanwhile, after the printing plate 300 surrounds a circle of the printing plate, the head end and the tail end of the printing plate 300 are respectively fixed on a printing plate hanging device through a plurality of hanging plate pins, on one hand, the printing plate can be tightly attached to the printing plate as far as possible through regulating and controlling the distance between the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212, on the other hand, the whole stress is uniform, and the problems of creeping, loosening, falling and the like caused by the high-speed operation of the printing plate 300 can be effectively solved. Compared with a printing plate roller of a common small-sized printing workpiece, the printing plate roller matched with the hanging device has the advantages that the size, the volume and the self weight of the printing plate roller for a large basin are too large, the assembly and disassembly of the printing plate are time-consuming and labor-consuming, the number of times of disassembling the printing plate roller can be effectively reduced by adjusting the printing plate through the hanging device, and the plate hanging efficiency of large basin printing is improved.

Preferably, the hitching structure further comprises a plurality of guide pins 218, the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 are correspondingly provided with a plurality of guide pin 218 mounting holes along the tangential direction of the plate roller 100, and the plurality of guide pins 218 penetrate through the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212. The guide pin can play the effect of being connected between first fixed plate frame 211 and the fixed plate frame 212 that draws of second on the one hand, and when on the other hand adjusted the elasticity of the two, the guide pin can also play a guide's effect.

As a preferable scheme, as shown in fig. 6 and 7, in this embodiment, the eccentric cam assembly includes a screw rod connector, a cam step 216 and a cam base 217 that are sequentially arranged from top to bottom, the printing roller 100 is provided with a containing hole below the shaped groove 215, the cam base 217 is located in the containing hole, the cam step 216 is an eccentric circular structure and is clamped and arranged in the shaped groove 215, the shaped groove 215 is arranged corresponding to the advancing range of the cam step 216, and the screw rod connector is used for installing a screw rod so that the cam step 216 of the eccentric circular structure rotates in the shaped groove 215 under the driving of the screw rod, thereby driving the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 to move tangentially along the top pin 213. In addition, the eccentric cam assembly further comprises a shaft sleeve 250, and the shaft sleeve 250 is embedded in the accommodating hole of the plate roller 100 and is used for assisting in fixing the eccentric cam assembly on the plate roller 100.

As a preferable scheme, the carriage adjusting seat 220 assembly includes at least one set of carriage adjusting seat 220, steps are correspondingly disposed at joints of the carriage adjusting seat 220 and the first fixed carriage 211 and the second fixed carriage 212, and screw fixing holes are correspondingly disposed on the carriage adjusting seat 220 and the first fixed carriage 211 and the second fixed carriage 212. The carriage adjusting seat 220 presses the first fixed plate-pulling carriage 211 and the second fixed plate-pulling carriage 212 through the step fit, and then the whole hanging structure is fixed on the printing roller 100 through screws. In this embodiment, the frame adjustment seat 220 assembly includes two sets of frame adjustment seats 220, the two sets of frame adjustment seats 220 are respectively located at two ends of the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212, when the printing plate 300 is installed in place, the two sets of frame adjustment seats 220 press the first fixed plate-pulling frame 211 and the second fixed plate-pulling frame 212 through the step, and the hanging structure is integrally fixed on the printing roller 100 through screws

As a preferable scheme, the printing plate hanging device shown in this embodiment further includes two sets of gibs 230 disposed on two side walls of the plate hanging groove 110, the two sets of gibs 230 are used for limiting the hanging structure, the first fixed plate pulling frame 211 and the second fixed plate pulling frame 212 are mounted between the two sets of gibs 230, one end of each top pin 213 after passing through the first fixed plate pulling frame 211 abuts against the gib 230 on the side where the top pin is located, and the other end of each top pin 213 abuts against a mounting hole of the top pin 213 in the second fixed plate pulling frame 212.

Preferably, the printing plate hanging device of the present embodiment further includes an insert assembly, the insert assembly includes an insert 240 and a screw rod in threaded connection with the insert 240, the insert 240 corresponding to the first fixed drawing plate frame and the printing roller 100 is respectively provided with insert mounting holes 219, and the insert assembly is fixed to the printing roller 100 after passing through the first fixed drawing plate frame. The bushing assembly is used for fine adjustment of the position of the printing plate 300 on the plate roller 100, and after the printing plate 300 is installed on the hanging device, if the position of the printing plate 300 is slightly deviated, fine adjustment of the first fixed drawing plate frame can be achieved by adjusting the bushing assembly, so that fine adjustment of the position of the printing plate 300 is driven.

Fig. 10 is a schematic structural view of a discharging mechanism in a curved offset printing press for large-basin printing according to the present invention, fig. 11 is a schematic structural view of the discharging mechanism in fig. 10 matching with a workpiece to be printed, and fig. 12 is a schematic structural view of an embodiment of the discharging mechanism with a discharging guide bracket. As shown in fig. 10 to 12, the discharging mechanism 500 includes: the cup collecting base 510 is provided with an inclined mounting surface 511, the cup collecting base 510 is slidably connected with a bearing platform 530 through a linear motion screw rod component 520, so that the bearing platform 530 is driven to move up and down along the inclined mounting surface 511 through the motion of the linear motion screw rod component 520, two parallel synchronous pulley components 540 with opposite conveying surfaces 549 are arranged on the bearing platform 530, and a printing workpiece clamping and conveying channel 560 for obliquely and downwardly discharging a printing workpiece 460 is formed between the conveying surfaces 549 of the two synchronous pulley components 540. The carrying platform 530 is further provided with an opposite movement screw assembly 570 for the two synchronous pulley assemblies 540 to move oppositely or reversely, and the opposite movement screw assembly 570 drives the two synchronous pulley assemblies 540 to move relatively, so as to adjust the width of the workpiece clamping and transporting channel 560 according to the size of the workpiece 460.

In this embodiment, the linear motion screw assembly 520 includes an adjusting screw 521 disposed parallel to the left and right sides of the inclined mounting surface, a first adjusting power member 522 disposed at an end of the adjusting screw 521, a thrust ball bearing 523 and a round nut 524 disposed on the adjusting screw 521 and located at one side of the first adjusting power member 522, and an adjusting nut 525 slidably disposed on the adjusting screw 521, wherein the adjusting nut 525 is fixedly connected to the bearing platform 530, and two sides of the bottom of the bearing platform 530 are disposed with guide rails 531 for the bearing platform 530 to slide.

Further, the opposite movement screw assembly 570 includes an adjusting screw 571 disposed on the front side and the rear side of the parallel inclined mounting surface 511, the adjusting screw 571 is disposed on the supporting seat, a second adjusting power member 572 disposed on the end portion of the adjusting screw 571, and a left-handed adjusting nut and a right-handed adjusting nut slidably disposed on the adjusting screw 571, and the left-handed adjusting nut and the right-handed adjusting nut are respectively connected to a corresponding synchronous pulley assembly 540, so that the left-handed adjusting nut and the right-handed adjusting nut respectively drive the corresponding synchronous pulley assembly 540 to move relatively.

In practical application, the first adjusting power member 522 is a knob, the second adjusting power member 572 is a rotating handwheel, the diameter of the rotating handwheel is at least two times larger than the diameter of the adjusting screw 571, the rotating speed of the adjusting screw 571 is reduced by increasing the circumference of the rotating handwheel 572, and the adjusting precision is improved. Alternatively, as a preferred embodiment, the first adjusting power member 522 and the second adjusting power member 572 each include a driving motor, a coupler and a speed reducer, and the couplers are connected to the corresponding adjusting screws through the speed reducers to realize electronic control adjustment. In this embodiment, the cup receiving base 510 is a triangular structure.

Furthermore, the synchronous belt assembly 540 includes a cup receiving synchronous belt seat 541 mounted on the bearing platform 530, a servo motor mounted on the cup synchronous belt seat 541, a synchronous belt 542 and a synchronous wheel 543, in this embodiment, the synchronous belt assembly 540 further includes a tension wheel 544 and a guide wheel 545 cooperating with the tension wheel to clamp the synchronous belt 542, and the tension of the synchronous belt 542 is adjusted by the tension wheel 544 to adapt to the printing workpieces 460 with different toughness. In practical application, the cup receiving synchronous belt seat 541 is connected to a corresponding left-handed adjusting nut or right-handed adjusting nut, and a slider and a linear sliding guide 5411 slidably connected to the slider are disposed at the bottom of the cup receiving synchronous belt seat 541, so that the left-handed adjusting nut and the right-handed adjusting nut respectively drive the corresponding synchronous belt wheel assembly 540 to move relatively along the direction of the linear sliding guide 5411.

It should be noted that a printing workpiece guiding frame 580 is further disposed on the cup receiving base 541, the printing workpiece guiding frame 80 includes two guiding rods 581 disposed at intervals for supporting the bottom of the printing workpiece 460 and two pressing rods 582 disposed at intervals for pressing on the top of the printing workpiece 460, and the ends of the two guiding rods 581 are disposed in an upward inclined manner to buffer the falling printing workpiece 460.

The discharging mechanism 500 is provided with a cup receiving base 510 with an inclined mounting surface 511, two synchronous pulley assemblies 540 which are parallel and have opposite conveying surfaces are arranged on the cup receiving base 510, and the printing workpiece 460 is clamped by the two conveying surfaces 549 of the two synchronous pulley assemblies 540, so that the printing workpiece 460 is stably discharged in an inclined downward mode. The linear motion screw rod assembly 520 on the cup receiving base 510 can drive the two synchronous pulley assemblies 540 to move up and down along the inclined mounting surface 511, so that the front and back adjustment of the conveying channel is realized, the opposite motion screw rod assembly 570 can supply two synchronous pulley assemblies 540 to adjust the opposite or reverse relative positions, therefore, the distance between the two conveying surfaces 549 is adjusted by adjusting the opposite motion screw rod assembly 570, the printing workpieces 460 with different sizes can be conveyed, and the quick matching of the conveying channel corresponding to the printing workpieces 460 with different sizes is realized.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.

Claims

1. A curved surface offset press for large-basin printing comprises a feeding mechanism with a feeding main frame body, an indexing mechanism with an indexer feeding hole and an indexer discharging station, a printing mechanism and a discharging mechanism, and is characterized in that,

the feeding mechanism is used for conveying the large basins in the horizontal direction and adjusting the relative positions of the feeding main frame body and the feeding hole of the indexer;

the printing mechanism comprises a large transfer printing drum, various color printing roller assemblies and printing ink units, wherein the various color printing roller assemblies and the printing ink units are matched with the large transfer printing drum, each printing roller assembly comprises a printing roller, a hanging device and a printing plate, a plate hanging groove is formed in each printing roller, the hanging device is arranged on the plate hanging groove of each printing roller, each printing plate is arranged on each printing roller through the hanging device, each hanging device comprises a hanging structure arranged on the plate hanging groove, and a plate frame adjusting seat assembly for fixing the hanging structure on the plate hanging groove; the hanging structure comprises a first fixed plate-pulling frame, a second fixed plate-pulling frame, a plurality of top pins and a plurality of plate-hanging pins which are arranged on the first fixed plate-pulling frame and the second fixed plate-pulling frame, and an eccentric cam component; the ejector pin is an elastic component, a plurality of ejector pin mounting holes are correspondingly formed in the first fixed plate-pulling frame and the second fixed plate-pulling frame along the tangential direction of the plate roller, and the ejector pin penetrates through the first fixed plate-pulling frame through the ejector pin mounting holes and is embedded into the second fixed plate-pulling frame; the contact surface of the first fixed plate pulling frame and the second fixed plate pulling frame is provided with a special-shaped groove, the eccentric cam assembly is arranged between the first fixed plate pulling frame and the second fixed plate pulling frame through the special-shaped groove, and the first fixed plate pulling frame and the second fixed plate pulling frame are separated and closed along the ejector pin along with the loosening and tightening of the eccentric cam assembly; the first fixed plate-pulling frame and the second fixed plate-pulling frame are respectively provided with a plurality of plate-hanging pin mounting holes along the radial direction of a plate roller, the printing plate is correspondingly provided with a plurality of plate-hanging pin mounting holes, and when the first fixed plate-pulling frame and the second fixed plate-pulling frame are closed tangentially, the plate hanging is fixed on the first fixed plate-pulling frame and the second fixed plate-pulling frame through the plate-hanging pins; the plate frame adjusting seat assembly is used for fixing the first fixed plate pulling frame and the second fixed plate pulling frame on the plate hanging groove;

the dividing mechanism is used for conveying the large basin transmitted by the feeding mechanism to the printing mechanism for offset printing and then transferring the large basin to the discharging mechanism;

the discharging mechanism is obliquely arranged below the feeding hole of the indexer and is used for obliquely and downwards outputting the offset-printed large basin, and the size of a discharging channel of the discharging mechanism and the relative position of the discharging channel and a discharging station of the indexer are adjusted.

2. The offset press for large-basin printing of claim 1, wherein the eccentric cam assembly comprises a screw rod connector, a cam step and a cam base which are sequentially arranged from top to bottom, the plate roller is provided with a containing hole below the special-shaped groove, the cam base is arranged in the containing hole, the cam step is of an eccentric circular structure and is clamped in the special-shaped groove, and the screw rod connector is used for installing a screw rod.

3. The offset curved printing press for large-basin printing as defined in claim 2, wherein the eccentric cam assembly further comprises a bushing inserted into the receiving hole of the plate roller for assisting in fixing the eccentric cam assembly to the plate roller.

4. The offset press according to claim 1, wherein the frame adjustment seat assembly comprises at least one set of frame adjustment seat, the frame adjustment seat is provided with a step corresponding to a joint of the first fixed plate-pulling frame and the second fixed plate-pulling frame, the frame adjustment seat is provided with a mounting hole corresponding to the first fixed plate-pulling frame and the second fixed plate-pulling frame, and the frame adjustment seat presses the first fixed plate-pulling frame and the second fixed plate-pulling frame through the step, and then presses the whole hooking structure fixed on the printing roller through the mounting hole.

5. The offset curved printing press according to claim 1, wherein the hanging device further comprises two groups of strips fixedly arranged on two side walls of the plate hanging groove, the hanging structure is arranged between the two groups of strips, and the two groups of strips are used for limiting the hanging structure;

6. A flexographic offset printing press for printing in accordance with claim 1, wherein said feed mechanism comprises a feed main frame body, a front-rear adjustment portion provided on said feed main frame body;

the front and back adjusting part comprises lifting support plates arranged on the front and back sides of the feeding main frame body, a workbench which is arranged on the two lifting support plates in a spanning manner and is arranged horizontally, two supports which are arranged on the two opposite sides of the workbench in a spanning manner and are arranged on the two lifting support plates in parallel, the brackets are all provided with a first slide rail, the first slide rail is at least provided with a slide block, the slide block is fixedly connected with a frame body connecting plate, the frame body connecting plate is fixedly connected with the workbench, the bracket is provided with a power assembly for the slide block to move linearly, the power assembly is provided with an output screw rod which is connected with a clamping fixing piece in a sliding way, the clamping fixing pieces extend to two opposite sides of the workbench and are fixedly connected with the workbench so as to drive the workbench to adjust the front and rear positions through the rotation of the output screw; and the support is also covered with a cover plate, and the top surface of the cover plate is flush with the workbench so as to feed the printing piece stably.

7. The offset curved printing press for printing with a large basin as claimed in claim 6, wherein the feeding mechanism further comprises an up-down adjusting part provided on the feeding main frame body; the upper and lower adjusting part comprises push rod mounting plates which are arranged on upright posts on two opposite sides of the feeding main frame body and are transversely arranged, an electric push rod is arranged on the push rod mounting plates, the electric push rod penetrates through the top of the feeding main frame body and is fixedly connected with the lifting support plate, passive telescopic parts are respectively arranged at two ends between the lifting support plate and the top of the feeding main frame body, and the tops of the passive telescopic parts are fixed on the lifting support plate through an end cover so as to adjust the height of the workbench through the electric push rod;

the passive telescopic part comprises a linear bearing sleeved in the feeding main frame body, a chromium-plated optical axis arranged in the linear bearing in a sliding mode, and a limiting part for preventing the chromium-plated optical axis from sliding out of the linear bearing.

8. The curved offset printing press for large-basin printing according to claim 6, wherein the first slide rail is arranged on one side of the top of the support, the other side of the top of the support is further provided with a second slide rail, the second slide rails are respectively provided with at least one driven slide block, a frame connecting plate is fixedly connected to each driven slide block, and the frame connecting plate is fixedly connected with the workbench so as to enable the workbench to stably slide back and forth;

9. The offset curved printing press for large-basin printing according to claim 1, wherein the discharging mechanism comprises a cup receiving base having an inclined mounting surface, the cup receiving base is slidably connected to a bearing platform via a linear motion screw assembly, so that the bearing platform is driven to move up and down along the inclined mounting surface by the motion of the linear motion screw assembly, two parallel synchronous pulley assemblies with opposite conveying surfaces are arranged on the bearing platform, and a workpiece clamping and conveying channel for obliquely discharging the workpiece downwards is formed between the conveying surfaces of the two synchronous pulley assemblies; the bearing platform is also provided with two opposite movement screw rod assemblies for the opposite or reverse movement of the synchronous pulley assemblies, and the opposite movement screw rod assemblies drive the two synchronous pulley assemblies to move oppositely so as to adjust the width of the clamping and conveying channel of the printing workpieces corresponding to the size of the printing workpieces.

10. The offset press for printing on a curved surface of a large basin according to claim 9, wherein the linear motion screw assembly comprises an adjusting screw arranged on the left side and the right side of the parallel inclined mounting surface, a first adjusting power piece arranged at the end part of the adjusting screw, a thrust ball bearing and a round nut which are arranged on the adjusting screw and are positioned on one side of the first adjusting power piece, and an adjusting nut which is arranged on the adjusting screw in a sliding manner, and the adjusting nut is fixedly connected with the bearing platform;