CN111204122B

CN111204122B - Printing machine

Info

Publication number: CN111204122B
Application number: CN202010027584.7A
Authority: CN
Inventors: 鲁伟
Original assignee: Hangzhou Yulan Technology Co ltd
Current assignee: Hangzhou Yulan Technology Co ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2022-01-25
Anticipated expiration: 2040-01-10
Also published as: CN111204122A

Abstract

The invention relates to a printing machine, which comprises a rack, an unreeling device, a tensioning device, a printing device, a drying device and a reeling device, wherein the tensioning device comprises a discharging tension component and a receiving tension component; the material receiving tension assembly comprises a rear tension shaft guide block, a material receiving tension roller and a rear distance sensor; printing device includes the printing floorbar, connects in the printing platform of printing floorbar and support stock, printing platform includes releasable connection's back arc board, induced drafts platform and preceding arc board, and the platform that induced drafts is equipped with the through-hole that induced drafts, and the through-hole intercommunication that induced drafts has the fan. The invention has the effect of better controlling the printing stock not to generate wrinkles in the printing process.

Description

Printing machine

Technical Field

The invention relates to the technical field of printing machines, in particular to a printing machine.

Background

The ink-jet printer consists of a system controller, an ink-jet controller, a spray head, a printing stock driving mechanism and the like. The ink is ejected from the nozzle of the nozzle to be printed on the printing stock under the control of the ink-jet controller. According to the printing requirements, the driver delivers the printing stock, and the system controller is responsible for the operation of the whole machine.

However, the printing material is subjected to tension and pressure of the printing device during printing, so that the surface of the printing material is not in a smooth and flat state, and errors occur in printed figures and characters. To avoid this, the printing platform of the current printing machine keeps a smooth plane, and simultaneously, the printing stock is tensioned through the feeding part and the discharging part of the printing machine, so that the printing stock keeps a tensioned state along the length direction of the printing stock.

However, the excessively tensioned printing material is apt to warp in the longitudinal direction and wrinkle in the width direction, and the flatness of the surface cannot be guaranteed. Therefore, in order to better lock the printing stock and keep the printing stock flat during printing, a new technical scheme is provided.

Disclosure of Invention

In view of the deficiencies of the prior art, it is an object of the present invention to provide a printing press.

The above object of the present invention is achieved by the following technical solutions: a printing machine comprises a rack, an unreeling device, a tensioning device, a printing device, a drying device and a reeling device, wherein the tensioning device comprises a feeding tension assembly matched with the unreeling device and a receiving tension assembly matched with the reeling device, the feeding tension assembly comprises a front tension shaft guide block connected with the rack, a feeding tension roller sliding along the length direction of the front tension shaft guide block to adjust tension, and a front distance sensor connected to one end of the front tension shaft guide block, wherein the front distance sensor faces the feeding tension roller to detect the distance between the feeding tension roller and the front distance sensor; the material receiving tension assembly comprises a rear tension shaft guide block, a material receiving tension roller and a rear distance sensor facing the material receiving tension roller;

printing device includes the printing floorbar, connects in the printing platform of printing floorbar and support stock, printing platform includes releasable connection's back arc board, the platform and the preceding arc board of induced drafting, and the platform of induced drafting is equipped with the through-hole of induced drafting towards the stock, and the through-hole intercommunication of induced drafting has the fan, and the stock slides in the platform of induced drafting along the back arc board after blowing tension assembly, prints at the platform of induced drafting to follow the preceding arc board and from the platform roll-off that induced drafts, after receiving material tension assembly, get into the coiling mechanism rolling.

The unwinding speed is gradually reduced along with the continuous discharging of the unwinding roller, when the roll diameter of the printing stock on the unwinding roller is gradually reduced, if the rotating speed of the unwinding motor is unchanged, the unwinding speed is gradually reduced, in order to maintain the tension of the printing stock unchanged, the unwinding tension roller is farther away from the front distance sensor at the moment, and the front distance sensor sends a sensing signal until the distance reaches a certain length, so that the unwinding motor is controlled to accelerate the rotating speed, the unwinding speed of the printing stock is maintained unchanged, and the tension borne by the printing stock is stable;

the winding diameter on the winding motor is gradually increased along with the continuous material collection of the winding roller, if the rotating speed of the winding motor is unchanged, the winding speed is increased, in order to maintain the tension of the printing stock, the material collection tension roller and the rear distance sensor are closer and closer, and the rear distance sensor sends a sensing signal until the distance reaches a certain length, so that the winding motor is controlled to reduce the rotating speed, the winding speed of the printing stock is maintained unchanged, and the tension borne by the printing stock is stable;

through adopting above-mentioned technical scheme, make rolling motor, rolling motor's rotational speed can adjust according to the condition, make the stock remain invariable traction force throughout, can not because the too big fold of traction force, and after the stock reachs print platform, can be locked by the platform that induced drafts to further prevent the appearance of fold, carry on spacingly to the stock.

The present invention in a preferred example may be further configured to: the both sides of printing platform are releasable connection respectively has left shrouding of platform and right shrouding of platform, and the bottom of left shrouding of platform and the right shrouding of platform supports in the printing floorbar to through the printing floorbar of printing platform below, the left shrouding of platform and the right shrouding of platform of printing platform both sides, the platform that induced drafts at top, preceding arc board and back arc board around, enclosed into the chamber of induced drafting jointly, induced draft the through-hole with induced draft the chamber intercommunication, the fan is connected in the intracavity that induced drafts.

By adopting the technical scheme, the sealed air suction cavity is formed, the fan is started after the printing stock slides into the air suction platform along the rear arc plate, the fan sucks air in the air suction cavity, and negative pressure is formed at the air suction through hole, so that the printing stock can be adsorbed and locked by the air suction through hole, the printing stock can still be kept flat during printing, and the printing text cannot be inaccurate; simultaneously preceding arc board, back arc board and the platform that induced drafts are releasable connection, can be when the section bar takes place deformation convenient change practice thrift use cost.

The present invention in a preferred example may be further configured to: the chamber of induced drafting is including being located the negative pressure chamber under the platform of induced drafting, being located the suction chamber under the front arc board, being located well cavity under the back arc board, keeps apart through preceding baffle between negative pressure chamber and the suction chamber, keeps apart through the backplate between suction chamber and the well cavity, and preceding baffle is equipped with a plurality of suction holes that communicate with the negative pressure chamber, and a plurality of suction holes evenly arrange along the length direction of preceding baffle, and the fan is connected in preceding baffle and with suction hole one-to-one intercommunication.

By adopting the technical scheme, the suction cavity is used for accommodating the fan, so that the bearing object can be guided, and the fan can be accommodated; when printing is carried out, a fan with strong suction is used for suction, and negative pressure is uniformly formed in the negative pressure cavity, so that wrinkles caused by uneven stress of a printing stock due to uneven negative pressure are prevented; meanwhile, through the design of the cavities such as the suction cavity, the hollow cavity and the like, the total weight is reduced on the basis of meeting the requirement that the front arc plate and the rear arc plate guide the printing stock, on one hand, the cost can be saved, and on the other hand, the service life of the supporting part can be prolonged conveniently.

The present invention in a preferred example may be further configured to: the suction cavity is internally connected with a front arc supporting plate, and the front arc supporting plate comprises an arc surface attached to the inner wall of the front arc plate, a vertical surface abutted against the front baffle and a horizontal surface abutted against the printing bottom beam; the front arc supporting plates are uniformly distributed along the length direction of the suction cavity, and each front arc supporting plate is positioned between two adjacent fans.

By adopting the technical scheme, the front arc supporting plate can be used for isolating the adjacent fans at the same time, the air chamber is manufactured, and the fans are prevented from interfering with each other. The front arc supporting plate is used for connecting the front arc plate, the front baffle and the printing bottom beam into a whole, so that the supporting strength of the front arc plate is improved, and the front arc plate is prevented from deforming under the long-time suction use of the fan.

The present invention in a preferred example may be further configured to: the rear tension shaft guide blocks are symmetrically arranged on the left side and the right side of the rack, each rear tension shaft guide block is provided with a tension shaft guide groove along the length direction, and two ends of the material receiving tension roller are respectively positioned in the tension shaft guide grooves of the rear tension shaft guide blocks; racks are arranged on the opposite sides of the two force shaft guide grooves, and balance gears meshed with the racks are arranged at the two ends of the material receiving tension roller.

Through adopting above-mentioned technical scheme, make the both ends of receiving the material tension roller can balance in two power axle guide ways, avoid appearing receiving the oblique condition of material tension roller, use the cooperation of balanced gear and rack, further avoid receiving the oblique condition of material tension roller.

The present invention in a preferred example may be further configured to: the front tension shaft guide block is obliquely arranged, the lower end of the front tension shaft guide block is connected with a front sensor fixing seat, the front distance sensor is connected on the front sensor fixing seat, and a printing stock bypasses the discharging tension roller between the front sensor fixing seat and the discharging tension roller; the rear tension shaft guide block is obliquely arranged, the higher end of the rear tension shaft guide block is connected with a rear sensor fixing seat, the rear distance sensor is connected to the rear sensor fixing seat, and the printing stock bypasses the material receiving tension roller on one side of the material receiving tension roller far away from the rear sensor fixing seat.

Through adopting above-mentioned technical scheme, preceding distance sensor and back distance sensor set up respectively in the front the low side of tension shaft guide block, the top of back tension shaft guide block to make two sensor can unify the control mode of motor, no matter rolling process or unreel the process, distance sensor is more close with the tension roller, just needs to reduce motor speed, and distance sensor is more far away with the tension roller, just needs to accelerate motor speed.

The present invention in a preferred example may be further configured to: drying device is including locating printing device and receiving last drying assembly between the tension subassembly, locating the lower drying assembly who receives between tension subassembly and the coiling mechanism, goes up drying assembly including connecting in the last stoving cover of frame, goes up the opening of stoving cover and towards the stock, goes up stoving cover in-connection and has dried lamp and last drying fan on, goes up drying fan and supplies air towards the stock.

By adopting the technical scheme, the upper drying fan is used for increasing the drying stroke, so that the printing stock is preheated through the flow of hot air flow, the total heating stroke is prolonged, and the drying strength is improved; and take away the partial heat of last stoving lamp high temperature position through the air current, make the heat around the stoving lamp more even, even the temperature of going up the stoving lamp is very high, also can not burn the local burning of stock to quick stoving, the even stoving when realizing the heavy ink printing simultaneously.

The present invention in a preferred example may be further configured to: a plurality of upper drying lamps and a plurality of upper drying fans are arranged in the upper drying cover, the plurality of upper drying lamps are arranged into two groups along the length direction of the upper drying cover, the plurality of upper drying fans are arranged into one group along the length direction of the upper drying cover, and the upper drying fans of the group are positioned between the two groups of upper drying lamps; the upper drying lamps are all independently provided with switches.

When last drying fan starts, the air current heats through the last stoving lamp of both sides, then the opening of the cover of drying from the top flows towards the stock, through adopting above-mentioned technical scheme for the air current can be heated faster, improves holistic stoving intensity, and when not needing too high stoving intensity, also can close partly stoving lamp, realizes stoving intensity's regulation.

The present invention in a preferred example may be further configured to: the frame bottom is equipped with cooling plate, and cooling plate is located the coiling mechanism and receives between the material tension assembly, and the stock is directly over cooling plate, cooling plate is vertical upwards to be connected with cooling fan.

Through adopting above-mentioned technical scheme, use cooling fan to upwards face the stock air feed to can cool off the stock when needing, for example when using PVC as the stock, just need to use cooling fan, in order to prevent that PVC from lasting high temperature from resulting in the ink to paste and falling.

The present invention in a preferred example may be further configured to: the opening direction of lower stoving cover is towards the side of cooling plate, the one side of cooling plate stoving cover down is provided with the deflector of slope, drying fan's air current blows to the stock through the deflector down, lower stoving subassembly is including lower stoving cover, and lower stoving cover in-connection has lower stoving lamp, the back of lower stoving cover is connected with lower drying fan, and lower drying fan supplies the wind towards the stock.

Through adopting above-mentioned technical scheme, the optional opening of lower stoving subassembly, when printing speed is very fast, only lean on stoving subassembly probably not enough to dry completely, the stock is through last stoving subassembly stoving back, through stoving subassembly down, finally carry out the rolling, there is not the ink to be pasted, be stained with the condition such as china ink and take place, and simultaneously, lower stoving lamp also can control and open and close, thereby make down drying fan can play the cooling effect to the stock, through adopting above-mentioned technical scheme, when drying fan's air current blows the deflector, the air current upwards moves along the deflector, through this turn, make the velocity of flow of air current, the temperature all obtains reducing, also make the stoving to the stock more even.

In summary, the invention includes at least one of the following beneficial technical effects:

1. through the arrangement of the front distance sensor and the rear distance sensor, the rotating speeds of the winding motor and the winding motor can be adjusted according to the situation, and the condition that the winding motor is suddenly stopped to cause uneven collection of printing materials on the winding roller is avoided;

2. through the design of the air suction cavity, the air suction through hole and the fan, negative pressure locking is carried out on the printing stock, and unevenness of the printing stock during printing is avoided.

Drawings

FIG. 1 is a schematic view of a printing press configuration;

FIG. 2 is a general cross-sectional view of the printing press;

FIG. 3 is a schematic diagram of a printing platform configuration;

FIG. 4 is a schematic view of a hidden front arc plate, front baffle, a portion of a fan, and a portion of a front arc support plate;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a cross-sectional view of the present embodiment taken perpendicular to the length of the print beam;

FIG. 7 is a schematic view of a portion of the printer with the printing unit hidden;

FIG. 8 is a schematic sectional view taken along line B-B of FIG. 7;

FIG. 9 is an enlarged view of section C of FIG. 7;

fig. 10 is a view illustrating a structure of an upper drying assembly;

FIG. 11 is an enlarged schematic view of section D of FIG. 10;

FIG. 12 is a schematic view of the structure of the lower drying assembly;

FIG. 13 is an enlarged view of section E of FIG. 12

Fig. 14 is a circuit diagram of the control circuit.

In the figure, 1, a frame; 11. printing a bottom beam; 12. a printing platform; 121. a platform left sealing plate; 122. a platform right sealing plate; 13. a rear arc plate; 131. a hollow cavity; 14. an air suction platform; 141. an air suction through hole; 142. a negative pressure chamber; 143. a platform support frame; 144. a communicating hole; 15. a front arc plate; 151. a suction lumen; 152. an air outlet; 153. a front arc support plate; 16. a fan; 17. an external support plate; 18. an energy storage plate; 2. a tensioning device; 3. a discharge tension assembly; 31. a front tension shaft guide block; 32. a discharging tension roller; 33. a front distance sensor; 4. a material receiving tension assembly; 41. a post-tension shaft guide block; 42. a material receiving tension roller; 43. a rear distance sensor; 44. a tension shaft guide groove; 45. a rack; 46. a rear sensor holder; 5. a drying device; 51. cooling the bottom plate; 52. a guide plate; 53. an upper drying component; 531. an upper drying cover; 532. an upper drying lamp; 533. an upper drying fan; 534. a drying cavity; 535. a heat insulating mesh enclosure; 54. a lower drying component; 541. a lower drying lamp; 542. a lower drying fan; 543. a lower drying cover; 55. a cooling fan; 6. an unwinding device; 61. unwinding rollers; 62. an unwinding motor; 7. a winding device; 71. a wind-up roll; 72. a winding motor; 8. a printing device; 1000. a control circuit; 100. a detection circuit; 200. a comparison circuit; 201. a first comparing section; 202. a second comparing section; 300. an execution circuit; 301. a first control unit; 302. a second control unit; r1, a first resistor; r2, a second resistor; r3, third resistor; r4, fourth resistor; r5, fifth resistor; r6, sixth resistor; r7, seventh resistor; r8, eighth resistor; r9, ninth resistor; A. a first comparator; B. a second comparator; q1, the first triode; q2, the second triode; KM2, a second relay; KM1, a first relay; KM2-1 and a second normally open contact switch; KM1-1, first normally open contact switch.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the printing machine disclosed by the invention comprises a frame 1, an unwinding device 6, a tensioning device 2, a printing device 8, a drying device 5 and a winding device 7, wherein the unwinding device 6 comprises an unwinding roller 61 and an unwinding motor 62 for driving the unwinding roller 61 to rotate, the winding device 7 comprises a winding roller 71 and a winding motor 72 for driving the winding roller 71 to rotate, and servo motors are used for the winding motor 72 and the unwinding motor 62. During printing, the printing material is pulled by the take-up motor 72 to print toward the printing device 8, and the tension stress is always kept stable by the unwinding motor 62 and the tensioning device 2.

As shown in fig. 3 and 4, the frame 1 is provided with a printing base beam 11 and a printing platform 12 for supporting the printing material, and the printing device 8 and the printing platform 12 are both connected to the printing base beam 11. The printing platform 12 comprises a rear arc plate 13, an air suction platform 14 and a front arc plate 15, and the three are detachably connected through bolts, so that the difficulty of overall processing is reduced, and the sectional material can be conveniently replaced when deformed. When printing is carried out, the printing stock slides into the air suction platform 14 along the rear arc plate 13 under the pulling of the winding roller 71, at the moment, the air suction platform 14 locks the printing stock, the printing device 8 prints on the printing stock through the printing ink box, and after the printing is finished, the printing stock slides out of the air suction platform 14 along the front arc plate 15.

The both sides of printing platform 12 are respectively through bolt releasable connection with left shrouding 121 of platform and right shrouding 122 of platform, and the bottom of left shrouding 121 of platform and right shrouding 122 of platform supports in printing floorbar 11 to through the printing floorbar 11 of printing platform 12 below, the left shrouding 121 of platform and the right shrouding 122 of platform of printing platform 12 both sides, the platform 14 that induced drafts at top, preceding arc board 15 and back arc board 13 around, enclosed into sealed air suction cavity jointly. The platform 14 that induced drafts is equipped with the through-hole 141 that induced drafts of a plurality of intercommunications air suction chamber, and the through-hole 141 intercommunication that induced drafts has fan 16, and when needs locking stock, fan 16 starts, forms the negative pressure in through-hole 141 department that induced drafts to through a plurality of adsorption affinity of through-hole 141, the stock on the platform 14 that will induced drafts adsorbs the locking.

As shown in fig. 4 and 5, the suction cavity includes a negative pressure cavity 142 located right below the suction platform 14, a suction cavity 151 located right below the front arc plate 15, and a hollow cavity 131 located right below the rear arc plate 13, the negative pressure cavity 142 and the suction cavity 151 are separated by a front baffle, and the suction cavity 151 and the hollow cavity 131 are separated by a rear baffle. The front baffle is provided with a plurality of suction holes communicated with the negative pressure chamber 142, so that the negative pressure chamber 142 can be communicated with the outside only through the suction holes and the suction through holes 141. The length direction of baffle evenly arranges before a plurality of suction holes edge, fan 16 connect in the front baffle and with suction hole one-to-one intercommunication, when a plurality of fans 16 work jointly, the air in negative pressure chamber 142 is taken out, whole even formation negative pressure state, with the even absorption of stock on induced draft platform 14, and can not appear the fold because of the atress inequality. An air outlet 152 is further arranged at the bottom of the suction cavity 151, and an air outlet of the fan 16 is vertically downward and is arranged towards the air outlet 152.

In order to support the front arc plate 15 and ensure that the front arc plate 15 does not deform under the long-term suction work of the fan 16, a front arc support plate 153 is further connected in the suction cavity 151, the front arc support plate 153 is a quarter circle and comprises an arc surface attached to the inner wall of the front arc plate 15, a vertical surface abutted to a front baffle and a horizontal surface abutted to the printing bottom beam 11, so that the arc surface of the front arc plate 15 is supported through the printing bottom beam 11 and the front baffle.

The front arc support plates 153 are uniformly distributed along the length direction of the suction cavity 151, and when the front arc plate 15 is installed, each front arc support plate 153 is connected between two adjacent fans 16, so that the adjacent fans 16 are separated, and the effect of avoiding mutual interference between the fans 16 is achieved while the front arc plate 15 is supported.

As shown in fig. 5 and 6, a platform support 143 is further disposed in the negative pressure chamber 142, the platform support 143 is a grid frame, and air can conveniently pass through the platform support 143 when the fan 16 sucks air, so that the air draft effect is not affected. The platform support frames 143 are provided with a plurality of supports along the length direction of the negative pressure cavity 142, the top ends of the platform support frames 143 are abutted to the bottom surface of the air suction platform 14, and the bottom ends of the platform support frames 143 are abutted to the top surface of the printing bottom beam 11, so that the air suction platform 14 is supported. When connecting platform support frame 143, support tight the connection with preceding baffle, backplate respectively with the both ends of platform support frame 143 through the bolt to realize platform support frame 143's releasable connection, also can increase the bulk strength of preceding baffle, backplate.

The front baffle is provided with a connecting hole, the platform supporting frames 143 and the front arc supporting plates 153 are in one-to-one correspondence and are tightly abutted to two ends of the connecting hole, the adjacent platform supporting frames 143 and the front arc supporting plates 153 penetrate through the connecting hole by using the same bolt, and the same bolt is screwed to the front baffle, so that the front arc supporting plates 153, the front baffle and the platform supporting plates 143 are connected into a whole more firmly.

In order to connect a plurality of platform support frames 143 as a whole, increase platform support frame 143's bulk strength, intercommunicating pore 144 has been seted up along negative pressure chamber 142's length direction on platform support frame 143, platform left side shrouding 121 and platform right shrouding 122 all seted up with intercommunicating pore 144 complex jack, the inserted bar is worn to be equipped with in jack department, the inserted bar passes a plurality of intercommunicating pores 144 along negative pressure chamber 142's length direction, and wear out in the jack department of opposite side, thereby reach the effect of connecting platform support frame 143. When the insertion holes are formed, the insertion holes need to be slightly larger than the communication holes 144, chamfers are formed, and the communication holes 144 project into the insertion holes, so that the insertion rods can be inserted more easily.

In order to further enhance the connection stability of the platform supporting frame 143, the plurality of inserting rods are also provided, the cross section of the platform supporting frame 143 in the direction perpendicular to the length direction of the inserting rods is rectangular, and the four corners of the rectangle are all connected with the inserting rods. Meanwhile, the frame body grids of the platform supporting frame 143 are also provided with communicating holes 144, and the inserting rods can be used for inserting connection.

As shown in fig. 7 and 8, the tensioning device 2 includes a feeding tension assembly 3 cooperating with the unwinding device 6, and a receiving tension assembly 4 cooperating with the winding device 7. The feeding tension assembly 3 comprises a front tension shaft guide block 31 connected to the rack 1, a feeding tension roller 32 sliding along the length direction of the front tension shaft guide block 31 to adjust tension, and a front distance sensor 33 connected to one end of the front tension shaft guide block, wherein the front distance sensor 33 is purchased from the market by using a common diffuse reflection distance sensor and is installed according to the specification.

Preceding distance sensor 33 is towards blowing tension roller 32 to detect the interval between blowing tension roller 32 and the preceding distance sensor 33, when connecting, preceding tension shaft guide block 31 is the slope setting, and lower one end is connected with preceding sensor fixing base, and preceding distance sensor 33 is connected in the front on the sensor fixing base, and the stock walks around blowing tension roller 32 between preceding sensor fixing base and blowing tension roller 32. When printing is carried out, the discharging tension shaft passively slides along the front tension shaft guide block 31 under the driving of the printing stock, so that the tension of the unwinding motor 62 and the winding motor 72 on the printing stock is kept unchanged as a buffer. Along with unreeling the roller 61 and constantly discharging, when unreeling the stock roll diameter on the roller 61 and reducing gradually, if unreeling motor 62's rotational speed is unchangeable, then the speed of unreeling can be more and more slow, in order to maintain stock tension unchangeable, the blowing tension roller 32 can be more far away from preceding distance sensor 33 this moment, and when reaching certain length, preceding distance sensor 33 sends sensing signal, comes control unreeling motor 62 to accelerate the rotational speed to maintain the stock speed of unreeling unchangeably, make the tension that the stock received stable.

As shown in fig. 8 and 9, the receiving tension assembly 4 is similar to the discharging tension assembly 3, and includes a rear tension shaft guide block 41, a receiving tension roller 42, and a rear distance sensor 43 facing the receiving tension roller 42, wherein the rear distance sensor 43 and the front distance sensor 33 use the same diffuse reflection distance sensor. The rear tension shaft guide block 41 is also obliquely arranged, the higher end of the rear tension shaft guide block is connected with a rear sensor fixing seat 46, the rear distance sensor 43 is connected to the rear sensor fixing seat 46, and the printing stock bypasses the material receiving tension roller 42 on one side of the material receiving tension roller 42 far away from the rear sensor fixing seat 46.

With the continuous collection of the winding roller 71, the winding diameter on the winding motor 72 is gradually increased, if the rotating speed of the winding motor 72 is unchanged, the winding speed is increased, in order to maintain the tension of the printing stock, the collection tension roller 42 and the rear distance sensor 43 are closer and closer, and until the distance reaches a certain length, the rear distance sensor 43 sends a sensing signal to control the winding motor 72 to reduce the rotating speed so as to maintain the winding speed of the printing stock unchanged, so that the tension borne by the printing stock is stable.

For the comprehensive material receiving tension assembly 4 and the material discharging tension assembly 3, no matter in the winding process or the unwinding process, the closer the distance sensor and the tension shaft is, the rotation speed of the motor needs to be reduced, and the farther the distance sensor and the tension shaft are, the rotation speed of the motor needs to be accelerated, so that the unified control and adjustment of the two sensors and the motor are facilitated.

In order to ensure that the material receiving tension roller 42 integrally and stably slides along the rear tension shaft guide block 41 without deflection, the rear tension shaft guide block 41 is symmetrically arranged at the left side and the right side of the rack 1, each rear tension shaft guide block 41 is provided with a tension shaft guide groove 44 along the length direction, two ends of the material receiving tension roller 42 are respectively positioned in the tension shaft guide grooves 44 of the rear tension shaft guide blocks 41, one opposite side of each of the two tension shaft guide grooves 44 is provided with a rack 45, and two ends of the material receiving tension roller 42 are respectively provided with a balance gear meshed with the racks 45. When the receiving tension roller 42 slides under the tension of the printing stock, the two ends of the receiving tension roller 42 are lifted simultaneously through the meshing of the balance gear and the rack 45, so that the detection of the rear distance sensor 43 is more accurate. The discharging tension assembly 3 is similar to the receiving tension assembly 4, and a rack 45 and a balance gear structure are also arranged on the front tension shaft guide block 31 and the discharging tension roller 32, so that the discharging tension roller 32 can stably slide.

In a second embodiment, as shown in fig. 1, in order to achieve sufficient drying while performing fast printing, the drying device 5 includes an upper drying component 53 disposed between the printing device 8 and the receiving tension component 4, and a lower drying component 54 disposed between the receiving tension component 4 and the winding device 7, and after two times of drying, the drying effect on the printing material can be ensured.

As shown in fig. 10 and 11, two external support plates 17 are respectively disposed on two sides of the frame 1, the external support plates 17 extend in a direction away from the printing machine, the upper drying assembly 53 includes an upper drying cover 531 connected between the two external support plates 17, an opening of the upper drying cover 531 faces the printing stock, and a length direction of the upper drying cover 531 is perpendicular to a moving direction of the printing stock and extends in a width direction of the printing stock. A plurality of upper drying lamps 532 and a plurality of upper drying fans 533 are connected in the upper drying hood 531, the length of the upper drying hood 531 is longer than the width of the printing stock, and the printing stock is projected in the upper drying hood 531 when passing through the upper drying hood 531 and is uniformly dried by the upper drying hood 531.

The upper drying lamps 532 use halogen lamps, a plurality of upper drying lamps 532 are arranged along the length direction of the upper drying cover 531 to form an upper group and a lower group, a plurality of upper drying fans 533 are arranged along the length direction of the upper drying cover 531 to form a group, and the group of upper drying fans 533 is located between the upper and lower groups of upper drying lamps 532. When the upper drying fan 533 is started, the air flow is heated by the upper drying lamps 532 on both sides, and then flows from the opening of the upper drying cover 531 toward the printing stock, so that the printing stock is preheated by the flow of hot air flow, the total heating stroke is prolonged, and the drying strength is improved. And partial heat at the high-temperature position of the upper drying lamp 532 is taken away through air flow, so that the heat around the upper drying lamp 532 is more uniform, and the printing stock can not be locally scorched even if the temperature of the upper drying lamp 532 is very high. When excessive temperature is not required, the partial upper drying lamp 532 may be turned off to adjust the drying intensity.

In order to increase the drying strength on the premise that the printing stock is not scorched, the energy storage plate 18 is connected to the frame 1 through bolts, the upper drying cover 531 and the energy storage plate 18 are located at the same height, when the printing stock passes through the upper drying component 53, one side of the printing stock faces the upper drying cover 531, and the other side of the printing stock faces the energy storage plate 18. The energy storage plate 18 is made of heat conduction materials, and the energy storage plate 18 is located at the same height of the upper drying cover 531, so that the energy storage plate 18 can continuously absorb heat blown out of the upper drying cover 531, a certain temperature is kept, one side of a printing stock, which is far away from the upper drying cover 531, is dried, and the drying effect is improved.

After the energy storage plate 18 is arranged, an upper drying cavity 534 with a rectangular cross section is formed by the energy storage plate 18, the drying cover and the two external support plates 17 in a surrounding way, so that on one hand, hot air can be prevented from escaping to the periphery through the upper drying cavity 534, and the energy consumption required by temperature maintenance is reduced; on the other hand, the printing stock can be dried from all directions, and the drying is more uniform while the drying effect is ensured. And when the fan 16 works, continuous air inlet and air outlet are needed, so that the back of the upper drying cover 531 is provided with an air inlet for supplying air to the upper drying fan 533, and the external support plate 17 is provided with an air outlet.

In order to prevent the upper drying lamp 532 from being overheated and to directly burn the load, a heat insulating net 535 is detachably connected to an opening of the upper drying cover 531 through bolts. The heat insulation mesh enclosure 535 is located between the upper drying fan 533 and the printing material, the opening of the upper drying mesh enclosure 531 is sealed, and after the heat insulation mesh enclosure 535 is installed, the air flow can be more uniform, and the effect of partially isolating the temperature of the drying lamp is achieved.

As shown in fig. 12 and 13, a cooling bottom plate 51 is provided at the bottom of the frame 1, the printing material passes through the drying chamber 534 to reach right above the cooling bottom plate 51 after being printed, a cooling fan 55 is provided on the top surface of the cooling bottom plate 51, the cooling fan 55 supplies air upwards towards the printing material, so that the printing material can be cooled when needed, for example, when PVC is used as the printing material, the cooling fan 55 is needed to prevent the PVC from being burnt due to the continuous high temperature.

A lower dryer assembly 54 is attached to the side of the cooling plate 51 on the side of the substrate directly above the cooling plate 51. The lower drying assembly 54 includes a lower drying cover 543 connected to the frame 1, and similarly to the upper drying cover 531, a lower drying lamp 541 is also connected to the lower drying cover 543, a lower drying fan 542 is connected to the back of the lower drying cover 543, and the lower drying fan 542 supplies air toward the printing material. Lower stoving subassembly 54 alternative is opened, and when printing speed was very fast, only lean on stoving subassembly 53 probably not enough to dry completely, the stock through last stoving subassembly 53 stoving back, in proper order through stoving subassembly 54, cooling fan 55 down, finally carries out the rolling, can not have that the ink is pasted and falls, the condition such as ink staining to take place. Meanwhile, the lower drying lamp 541 can also be controlled to be turned on or off, so that the lower drying fan 542 can also have a cooling effect on printing materials.

Similarly, in order to avoid the problem that the temperature of the printed material is too high due to the direct blowing of the hot air of the lower drying assembly 54 to the printed material, the lower drying fan 542 blows air towards the side surface of the cooling bottom plate 51, and the side surface of the cooling bottom plate 51 is obliquely arranged to form the guide plate 52, when the air flow of the lower drying fan 542 blows the guide plate 52, the air flow moves upwards along the guide plate 52, and the flow rate and the temperature of the air flow are reduced through the turning, so that the printed material is dried more uniformly.

The working process is as follows: after printing of the printing stock is finished by the printing device 8, the printing stock enters the upper drying component 53 and is firstly dried for the first time;

when the upper drying component 53 is in the upper drying component 53, the upper drying lamp 532 of the upper drying component 53 heats the surrounding air, and blows hot air to the printing stock through the upper drying fan 533, so that the printing stock and the energy storage plate 18 positioned at the other side of the printing stock are heated, and the subsequent printing stock can be dried by the energy storage plate 18 and the upper drying fan 533 at the same time;

after passing through the upper drying assembly 53, the printing material enters the lower drying assembly 54, and the lower drying assembly 54 dries the printing material again through the lower drying lamp 541 and the lower drying fan 542, so that the total drying stroke is improved, and the drying of the printing material is ensured;

after drying assembly 54 under, reach cooling fan 55 directly over, cooling fan 55 uses the normal atmospheric temperature air current, can carry out the third stoving, also can play the effect to the stock cooling, prevents that the stock from continuously being in high temperature state, leads to the ink to paste and falls.

In a third embodiment, as shown in fig. 14, the tensioning device 2 further includes a control circuit 1000 for controlling the rotation speeds of the unwinding motor 62 and the winding motor 72 according to the distance between the front distance sensor 33 and the discharging tension roller 32 and the distance between the rear distance sensor 43 and the receiving tension roller 42.

The control circuit 1000 includes a detection circuit 100 coupled to the front and

rear distance sensors

33 and 43 for receiving the sensing signal and sending a detection signal, a comparison circuit 200 coupled to the detection circuit 100, and an execution circuit 300 coupled to the comparison circuit 200.

The comparator circuit 200 includes a first comparator 201 and a second comparator 202.

The first comparing part 201 includes a first resistor R1, a second resistor R2, and a first comparator a, one end of the first resistor R1 is coupled to the direct current, the other end of the first resistor R1 is coupled to one end of the second resistor R2, the other end of the second resistor R2 is grounded, the positive phase end of the first comparator a is coupled to the connection point of the first resistor R1 and the second resistor R2 to receive a first preset value, the first preset value is a preset distance value, and when the distance between the unwinding tension shaft and the front distance sensor 33 is greater than the preset distance value, the unwinding motor 62 accelerates the rotation speed; the inverting terminal of the first comparator a is coupled to the front distance sensor 33 for receiving the detection signal.

The second comparing part 202 includes a third resistor R3, a fourth resistor R4, and a second comparator B, wherein one end of the third resistor R3 is coupled to the direct current, the other end of the third resistor R3 is coupled to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, the positive phase end of the second comparator B is coupled to the connection point of the third resistor R3 and the fourth resistor R4 to receive a second preset value, the second preset value is also a preset distance value, and when the distance between the material receiving tension roller 42 and the rear distance sensor 43 is smaller than the preset distance value, the rotation speed of the winding motor 72 is reduced; the inverting terminal of the second comparator B is coupled to the rear distance sensor 43 for receiving the detection signal.

The execution circuit 300 includes a first control unit 301 and a second control unit 302.

The first control part 301 includes a fifth resistor R5, a sixth resistor R6, a first triode Q1, a ninth resistor R9, and a first relay KM1, wherein one end of the fifth resistor R5 is coupled to the output end of the first comparator a, and the other end of the fifth resistor R5 is coupled to the base of the first triode Q1; the collector of the first transistor Q1 is coupled to the second relay KM2, and the emitter of the first transistor Q1 is grounded.

One end of the sixth resistor R6 is coupled to a connection point between the fifth resistor R5 and the base of the first transistor Q1, and the other end of the sixth resistor R6 is coupled to a connection point between the first transistor Q1 and ground.

The ninth resistor R9 has one end coupled to the dc power and the other end coupled to the collector of the first transistor Q1.

The first relay KM1 comprises a coil and a first normally open contact switch KM1-1, wherein one end of the coil is coupled to a connection point of a ninth resistor R9 and direct current, the other end of the coil is coupled to a connection point of the ninth resistor R9 and a first triode Q1, and the first normally open contact switch KM1-1 is coupled to the unwinding motor 62.

The second control part 302 comprises a seventh resistor R7, an eighth resistor R8, a second triode Q2, a second relay KM2 and a freewheeling diode, wherein one end of the seventh resistor R7 is coupled to one end of the second comparator B, and the other end of the seventh resistor R7 is coupled to the base of the second triode Q2; the collector of the second transistor Q2 is coupled to the second relay KM2, and the emitter of the second transistor Q2 is grounded.

One end of the eighth resistor R8 is coupled to the connection point of the seventh resistor R7 and the base of the second transistor Q2, and the other end is coupled to the connection point of the second transistor Q2 and the ground; the second relay KM2 is coupled to dc power, and the second relay KM2 includes a second normally open contact switch KM2-1 coupled to the winding motor 72. One end of the freewheeling diode is coupled to a connection point between the second relay KM2 and the collector of the second transistor Q2, and the other end of the freewheeling diode is coupled to a connection point between the second relay KM2 and ground.

The working process is as follows: the distance between the discharging tension roller 32 and the front distance sensor 33 is detected by the front distance sensor 33, and the distance between the receiving tension roller 42 and the rear distance sensor 43 is detected by the rear distance sensor 43;

when the distance between the feeding tension roller 32 and the front distance sensor 33 is larger than a first preset value, a first comparison signal is transmitted in the first comparison part 201 through signal processing of the front distance sensor 33, the first relay KM1 closes the first normally open contact switch KM1-1, so that direct current, the first normally open contact switch KM1-1 and the unwinding motor 62 are electrically connected, and finally, the first normally open contact switch KM1-1 is grounded, so that the rotation speed of the unwinding motor 62 is accelerated;

when the distance between the material receiving tension roller 42 and the rear distance sensor 43 is smaller than a second preset value, the second comparison part 202 transmits a second comparison signal, so that the second relay KM2 is started, the second normally-open contact switch KM2-1 is closed, the direct current, the second normally-open contact switch KM2-1 are closed, the winding motor 72 is electrically connected, and finally the winding motor 72 is grounded, so that the rotating speed of the winding motor 72 is reduced.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a printing machine, includes frame (1), unwinding device (6), overspeed device tensioner (2), printing device (8), drying device (5), coiling mechanism (7), its characterized in that: the tensioning device (2) comprises a discharging tension assembly (3) matched with the unwinding device (6) and a receiving tension assembly (4) matched with the winding device (7), the discharging tension assembly (3) comprises a front tension shaft guide block (31) connected to the rack (1), a discharging tension roller (32) sliding along the length direction of the front tension shaft guide block (31) to adjust tension, and a front distance sensor (33) connected to one end of the front tension shaft guide block (31), wherein the front distance sensor (33) faces the discharging tension roller (32) to detect the distance between the discharging tension roller (32) and the front distance sensor (33); the material receiving tension assembly (4) comprises a rear tension shaft guide block (41), a material receiving tension roller (42) and a rear distance sensor (43) facing the material receiving tension roller (42); the printing device (8) comprises a printing bottom beam (11) and a printing platform (12) which is connected to the printing bottom beam (11) and supports a printing stock, the printing platform (12) comprises a rear arc plate (13), an air suction platform (14) and a front arc plate (15) which are detachably connected, the air suction platform (14) is provided with an air suction through hole (141) towards the printing stock, the air suction through hole (141) is communicated with a fan (16), the printing stock slides into the air suction platform (14) along the rear arc plate (13) after passing through the discharging tension assembly (3), is printed on the air suction platform (14), slides out of the air suction platform (14) along the front arc plate (15), and enters the winding device (7) for winding after passing through the receiving tension assembly (4);

the air suction platform is characterized in that a left platform sealing plate (121) and a right platform sealing plate (122) are respectively detachably connected to two sides of the printing platform (12), the bottoms of the left platform sealing plate (121) and the right platform sealing plate (122) are supported on a printing bottom beam (11), so that an air suction cavity is defined by the printing bottom beam (11) below the printing platform (12), the left platform sealing plate (121) and the right platform sealing plate (122) on two sides of the printing platform (12), the air suction platform (14) on the top, the front arc plate (15) and the rear arc plate (13) in the front and at the rear, an air suction through hole (141) is communicated with the air suction cavity, and a fan (16) is connected into the air suction cavity;

the air suction cavity comprises a negative pressure cavity (142) located right below the air suction platform (14), a suction cavity (151) located right below the front arc plate (15), and a hollow cavity (131) located right below the rear arc plate (13), the negative pressure cavity (142) is isolated from the suction cavity (151) through a front baffle, the suction cavity (151) is isolated from the hollow cavity (131) through a rear baffle, the front baffle is provided with a plurality of suction holes communicated with the negative pressure cavity (142), the suction holes are uniformly distributed along the length direction of the front baffle, and fans (16) are connected to the front baffle and are communicated with the suction holes in a one-to-one correspondence manner;

a front arc supporting plate (153) is connected in the suction cavity (151), and the front arc supporting plate (153) comprises an arc surface attached to the inner wall of the front arc plate (15), a vertical surface abutted against the front baffle and a horizontal surface abutted against the printing bottom beam (11); a plurality of front arc supporting plates (153) are uniformly distributed along the length direction of the suction cavity (151), and each front arc supporting plate (153) is positioned between two adjacent fans (16).

2. A printing machine according to claim 1, wherein: the rear tension shaft guide blocks (41) are symmetrically arranged on the left side and the right side of the rack (1), each rear tension shaft guide block (41) is provided with a tension shaft guide groove (44) along the length direction of the rear tension shaft guide block, and two ends of the material receiving tension roller (42) are respectively positioned in the tension shaft guide grooves (44) of the rear tension shaft guide blocks (41); racks (45) are arranged on the opposite sides of the two force shaft guide grooves (44), and balance gears meshed with the racks (45) are arranged at the two ends of the material receiving tension roller (42).

3. A printing machine according to claim 1, wherein: the front tension shaft guide block (31) is obliquely arranged, the lower end of the front tension shaft guide block is connected with a front sensor fixing seat, the front distance sensor (33) is connected on the front sensor fixing seat, and a printing stock bypasses the discharging tension roller (32) between the front sensor fixing seat and the discharging tension roller (32); the rear tension shaft guide block (41) is obliquely arranged, the higher end of the rear tension shaft guide block is connected with a rear sensor fixing seat (46), the rear distance sensor (43) is connected to the rear sensor fixing seat (46), and the printing stock bypasses the material receiving tension roller (42) on one side of the material receiving tension roller (42) far away from the rear sensor fixing seat (46).

4. A printing machine according to claim 1, wherein: drying device (5) including locate printing device (8) and receive last drying assembly (53) between material tension assembly (4), locate lower drying assembly (54) between receiving material tension assembly (4) and coiling mechanism (7), go up drying assembly (53) including connecting in last drying cover (531) of frame (1), the opening of going up drying cover (531) is towards the stock, it has last drying lamp (532) and last drying fan (533) to go up drying cover (531) in-connection, it supplies the wind towards the stock to go up drying fan (533).

5. A printing machine according to claim 4, wherein: a plurality of upper drying lamps (532) and a plurality of upper drying fans (533) are arranged in the upper drying cover (531), the plurality of upper drying lamps (532) are arranged into two groups along the length direction of the upper drying cover (531), the plurality of upper drying fans (533) are arranged into one group along the length direction of the upper drying cover (531), and the group of upper drying fans (533) are positioned between the two groups of upper drying lamps (532); the plurality of upper drying lamps (532) are respectively provided with a switch.

6. A printing machine according to claim 4, wherein: frame (1) bottom is equipped with cooling plate (51), and cooling plate (51) are located coiling mechanism (7) and receive between material tension assembly (4), and the stock is directly over cooling plate (51), cooling plate (51) are connected with cooling fan (55) vertically upwards.

7. A printing machine according to claim 6, wherein: lower stoving subassembly (54) are including drying cover (543) down, and lower stoving lamp (541) are connected to drying cover (543) in down, the back of drying cover (543) is connected with down drying fan (542) down, the side of the opening direction orientation cooling bottom plate (51) of drying cover (543) down, cooling bottom plate (51) are provided with inclined deflector (52) towards the one side of drying cover (543) down, the air current of drying fan (542) blows to the stock through deflector (52) down, and lower drying fan (542) are towards the stock air feed.