CN111332002A

CN111332002A - Automatic offset press

Info

Publication number: CN111332002A
Application number: CN202010291460.XA
Authority: CN
Inventors: 王芳云; 陈婉珍
Original assignee: Shengfang Industrial Design Service Center Tuling Town Quangang District Quanzhou City
Current assignee: Anhui Guoyao Packaging Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-06-26
Anticipated expiration: 2040-04-14
Also published as: CN111332002B

Abstract

The invention relates to an automatic offset press, which comprises a main frame, and an offset printing device, a drying device and a material receiving device which are sequentially passed by a tray assembled on the main frame, wherein a plane base material is fixedly arranged in the tray; the offset printing device is used for performing positioning offset printing on the planar base materials in the trays passing through in sequence; the drying device comprises a shell, and an ascending mechanism, a descending mechanism and an exhaust mechanism which are assembled in the shell, the drying device improves the utilization rate of a longitudinal space in a mode of lifting a tray firstly and then descending the tray, and the air inlet and the exhaust mechanism of the drying device are configured, so that the air in the shell flows transversely, and the solvent volatilization speed and the drying efficiency are improved; and the air that the air inlet got into is difficult to be discharged by the feed inlet and the discharge gate of casing under the negative pressure and is used more environmental protection.

Description

Automatic offset press

Technical Field

The invention relates to the field of offset presses, in particular to an automatic offset press for the surfaces of shoe materials or other plane materials.

Background

Offset printing is a type of lithographic printing, which is simply a printing method in which the image on a printing plate is transferred to a printing material by means of a rubber blanket. The offset printing is carried out by single-color or multi-color multi-time overprinting, namely, when printing a printed matter, pictures and texts with different colors on a printing plate are accurately overlapped on the same printed matter; and the mesh points of various colors are not deformed, the pictures and the texts are not deformed, and the color is gorgeous and rich in stereoscopic impression. The offset printing is required to have extremely high degree of registration, and the printed glue layer needs to be dried before the next overprinting is finished in each printing.

When a common shoe material offset press in the market works at present, a shoe material to be printed is fixed on a tray according to a specified direction and position; after the offset press performs offset printing on the shoe materials on the tray, the tray runs on the horizontally extending conveying mechanism, and after required natural air drying or drying, the tray is recycled to perform the next same-color offset printing, or enter an offset printing device with other colors and graphs for overprinting in the next procedure. The dry conveying mechanism of the glue layer process of the existing offset press is basically horizontally extended, so that the overall equipment length of the offset press is larger (for example, the multifunctional composite press disclosed in the Chinese patent application with the application number of 200910049679.2 comprises an intaglio printing unit and a strip-shaped production line device which is formed by sequentially arranging a first replaceable offset printing unit, a second replaceable offset printing unit, a third replaceable offset printing unit, a fourth replaceable offset printing unit, a replaceable letterpress printing unit, a replaceable screen printing unit, a first replaceable flexographic printing unit and the like on the right side of the intaglio printing unit, the device has a very complicated structure and can be installed only by occupying a very large area of field, and the offset press with single-color automatic operation disclosed in the Chinese utility model with the application number of 99229895.4 comprises a paper feeding part, a paper feeding detection part, a paper feeding mechanism, a paper conveying mechanism, The paper feeding mechanism and the printing plate cylinder are arranged on the frame component, and the printing plate can be conveniently replaced due to the quick clamping mechanism arranged on the printing plate cylinder. However, the offset printing machine has a complicated structure, does not have a drying function, and has questionable offset printing efficiency. ) The length of the monochrome offset press is usually about 50 meters, the required factory building area requirement is large, and the cost is high; and the horizontally extending conveying mechanism is in a completely open state or the feeding end and the discharging end of the horizontally extending conveying mechanism are in a straight-through state, so that the difficulty in absorbing harmful gas generated by offset printing is high, the pollution degree to the production environment and atmosphere is high, and the environment-friendly production is not facilitated.

Disclosure of Invention

The invention provides an automatic offset press, which aims to solve the problems of large equipment floor area, large required factory building area, high cost, high pollution degree to production environment and atmosphere and unfavorable environmental-friendly production of the conventional offset press.

The invention adopts the following technical scheme:

the automatic offset press comprises a main frame, and an offset printing device, a drying device and a material receiving device which are sequentially passed by a tray assembled on the main frame, wherein a plane substrate is fixedly arranged in the tray; the offset printing device is used for performing offset printing on the plane base materials in the trays passing through in sequence; the drying device comprises a shell, a lifting mechanism, a descending mechanism and an exhaust mechanism, wherein the lifting mechanism, the descending mechanism and the exhaust mechanism are assembled in the shell; the tray output by the offset printing device sequentially enters a lifting mechanism through a feeding hole of the shell, the lifting mechanism is used for lifting the tray to the top in sequence, the tray at the top sequentially enters the descending mechanism, the descending mechanism is used for descending the tray to a discharging hole of the shell in sequence, and the discharging hole is arranged below the feeding hole; the exhaust mechanism is fixedly assembled on the shell and comprises an exhaust fan and an exhaust channel, the exhaust fan is used for exhausting air in the shell to the exhaust channel, the exhaust channel is internally provided with a deodorization mechanism, and gas in the exhaust channel is exhausted to the atmosphere through the deodorization mechanism. And a photochemical automatic monitoring system is also arranged in the exhaust channel and used for detecting whether VOCs (volatile organic compounds) in the gas passing through the deodorization mechanism reach the emission standard or not, and suspending the operation of the equipment and giving an alarm when the emission standard is not met. The receiving device comprises a receiving conveyer belt, a return conveyer belt, a lifting conveyer belt and a first lifting driving device; the tray output by the descending mechanism is transmitted back to the offset printing device through the material receiving conveying belt, the back conveying belt and the lifting conveying belt in turn according to the back conveying direction; or the tray output by the descending mechanism is sequentially conveyed to the next offset press through the material receiving conveying belt and the lifting conveying belt in the output direction; the first lifting driving device is used for lifting the lifting conveying belt to the horizontal height of the feeding hole of the shell.

In a further improvement, the offset printing device comprises a lifting table, an offset printing plate and a stopping trigger, wherein the pulling trigger is triggered to stop the tray from advancing when the tray enters the offset printing device to a specified position, the lifting table is connected in an aligned mode to lift the tray to the specified position, and the offset printing plate is used for performing offset printing operation on the primary planar substrate in an aligned mode with the tray.

In a further improvement, the top surface and/or the bottom surface of the tray are respectively provided with at least two positioning holes with conical surface structures at the hole bottoms, the bottom surface of the offset plate and/or the top surface of the lifting table are respectively and correspondingly provided with positioning columns with conical surface structures at the end parts, and the positioning columns are in one-to-one correspondence with the positioning holes and are in matched insertion connection with the positioning holes. The blocking trigger is preferably a travel switch or a laser sensor or an infrared sensor.

In a further improvement, the ascending mechanism and the descending mechanism respectively comprise two support walls which are symmetrically distributed along a vertical plane in front and back, each support wall comprises at least two synchronous belts which extend vertically and a plurality of support rods which extend horizontally, and each support rod is fixedly connected with at least two synchronous belts; the cross section of each supporting rod is L-shaped or U-shaped, and the openings of the two supporting rods are arranged oppositely; all hold-in ranges of the front and rear support walls respectively drive all the support rods to run in a synchronous mode along a set direction all the time and keep running in a horizontally extending mode all the time, and the trays are horizontally distributed and erected on the front and rear support rods in one-to-one correspondence.

In a further improvement, the ascending mechanism and the descending mechanism each include a plurality of fixed conveyor belts and lifting disks which are distributed in parallel up and down, the conveying directions of two adjacent layers of fixed conveyor belts are opposite, the tray output by the fixed conveyor belt of the next layer of the ascending mechanism is transferred to the input end of the fixed conveyor belt of the next layer of the adjacent ascending mechanism through the lifting disks, and the tray output by the fixed conveyor belt of the previous layer of the descending mechanism is transferred to the input end of the fixed conveyor belt of the next layer of the adjacent descending mechanism through the lifting disks.

In a further improvement, all the fixed conveyer belts are distributed at equal intervals from top to bottom, all the lifting disks of the lifting mechanism are synchronously and ascendingly connected into a whole through a first fixed frame, and all the lifting disks of the descending mechanism are synchronously and ascendingly connected into a whole through a second fixed frame. All the lifting disks are driven by the second lifting driving device to perform lifting action of a specified stroke. The lifting disc is used for conveying the conveying belt or pushing the conveying belt by a pushing mechanism to transfer the tray to the fixed conveying belt.

In a further improvement, the first lifting driving device and the second lifting driving device both comprise a guide rod, a pull rope and a reversing pulley, the lifting conveyer belt and the lifting disc both perform lifting motion along the guide rod, one end of the pull rope is fixedly connected with the lifting conveyer belt and the lifting disc, and the other end of the pull rope is fixedly connected with a power output rod of the air cylinder through the reversing pulley.

In a further improvement, the housing further comprises an air inlet, the air inlet is provided with a blower, the air inlet is arranged on the side wall of the housing with the lower middle part on one side of the descending mechanism, the exhaust blower is arranged on the side wall of the housing with the upper middle part on the opposite surface of the air inlet or on the top of the housing, and air is transversely blown to one side of the ascending mechanism from one side of the descending mechanism. The air inlet is provided with an electric heating heat source which is used for heating the air entering from the air inlet.

From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: the offset printing machine is simple in structure, the tray of the offset printing device is matched with the lifting table and the offset printing plate through the conical positioning holes and the positioning columns, the alignment precision of the offset printing plate and the area to be printed of a plane substrate can be effectively improved, high-precision overprinting is realized, and the registration precision of the offset printing device is effectively improved. In addition, the arrangement of the ascending mechanism and the descending mechanism of the drying device enables the offset press to more reasonably utilize the longitudinal space, and the equipment length of the offset press can be shortened to 4-5 meters, so that the equipment length of the offset press is effectively shortened, the occupied area of the equipment is reduced, the space utilization rate is effectively improved, the applicability of the field is changed, and the production cost is reduced; in addition, the air inlet and the exhaust mechanism of the drying device are configured, so that the air in the shell flows transversely, the air sucked by the air inlet can transversely pass through the surface of the offset printing layer, the volatilization speed of the solvent is improved, and the drying efficiency of the offset printing layer is improved; and the air that the air inlet got into is difficult to be discharged by the feed inlet and the discharge gate of casing under the negative pressure for the air that gets into in the casing all discharges through exhaust passage and deodorization mechanism's processing, thereby makes drying device can carry out deodorization processing to the air more comprehensively, makes the operation of offset press to the influence of surrounding environment littleer, uses more environmental protection. Finally, the material receiving device is configured, so that the operation of the offset printing machine can be selected to be transmitted back to the offset printing machine for single-color overprinting offset printing treatment or be selected to be transferred to another offset printing machine for overprinting treatment of different patterns and colors according to the actual offset printing times of the planar base material on the tray; the configuration of the material receiving device enables the offset press to have a modular assembly function, so that the offset press can be conveniently arranged and combined in order by connecting a plurality of offset presses end to form an offset printing assembly line, and the streamlined production of multiple overprints with different colors and different patterns is realized.

Drawings

Fig. 1 is a schematic structural view of the drying device of the offset printing press in a material receiving state in a front view.

Fig. 2 is a schematic structural diagram of a main view of a discharging state of a drying device of the offset printing press.

Fig. 3 is a left side view of the first elevation driving apparatus.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Referring to fig. 1 to 3, the automatic offset printing machine according to the present embodiment includes a main frame 1, and an offset printing device 3, a drying device 4, and a receiving device 5, which are sequentially passed through by a tray 2 mounted on the main frame 1, wherein a flat substrate is fixedly mounted in the tray 2.

With continued reference to fig. 1, the offset printing device 3 is used for offset printing of the positioning of planar substrates in successive trays 2. The offset printing device 3 includes a lifting table 31, an offset printing plate 32, and a stopping trigger 33, wherein the stopping trigger is triggered to stop the advance of the tray 2 when the tray 2 enters the offset printing device 3 to a designated position, the lifting table 31 is connected in an aligned manner to lift the tray 2 to the designated position, and the offset printing plate 32 is used for performing an offset printing operation on a planar substrate in an aligned manner with the tray 2. With reference to fig. 1, at least two positioning holes 20 with conical bottom surfaces are respectively formed on the top surface and/or the bottom surface of the tray 2, positioning posts 311 with conical end surfaces are respectively correspondingly formed on the bottom surface of the offset plate 32 and/or the top surface of the lifting table 31, and the positioning posts 311 are correspondingly and fittingly inserted into the positioning holes 20 one by one. The blocking trigger 33 is preferably a travel switch or a laser sensor or an infrared sensor. This offset printing device 3's tray 2 uses through the cooperation of toper locating hole 20 and reference column 311 with elevating platform 31, offset plate 32, can improve offset plate 32 effectively and treat the regional counterpoint precision of printing with the plane substrate, realizes high accuracy overprinting, effectively improves offset printing device 3's degree of registration.

With reference to fig. 1, the drying device 4 includes a casing 41, and an ascending mechanism 6, a descending mechanism 7, and an exhausting mechanism 8 which are assembled in the casing 41, and the casing 41 is fixedly assembled to the main frame 1. The tray 2 output by the offset printing device 3 sequentially enters the ascending mechanism 6 through the feeding hole of the shell 41, the ascending mechanism 6 is used for sequentially ascending the tray 2 to the top, the tray 2 at the top sequentially enters the descending mechanism 7, the descending mechanism 7 is used for sequentially descending the tray 2 to the discharging hole of the shell 41, and the discharging hole is lower than the feeding hole.

Referring to fig. 1 and 2, the automatic offset printing press according to the first embodiment differs from the first embodiment in that the ascending mechanism 6 and the descending mechanism 7 according to the first embodiment are a lifting system in which a conveyor belt is horizontally conveyed, specifically: the ascending mechanism 6 and the descending mechanism 7 each include a plurality of fixed conveyor belts 71 and lifting trays 72 which are distributed in parallel up and down, the conveying directions of two adjacent layers of fixed conveyor belts 71 are opposite, the tray 2 output by the fixed conveyor belt 71 on the next layer of the ascending mechanism 6 is transferred to the input end of the fixed conveyor belt 71 on the adjacent upper layer through the lifting tray 72, and the tray 2 output by the fixed conveyor belt 71 on the previous layer of the descending mechanism 7 is transferred to the input end of the fixed conveyor belt 71 on the adjacent lower layer through the lifting tray 72. All the fixed conveyor belts 71 are vertically and equally spaced, all the lifting disks 72 of the lifting mechanism 6 are synchronously and vertically connected together by a first fixing frame 73, and all the lifting disks 72 of the lowering mechanism 7 are synchronously and vertically connected together by a second fixing frame 74. All the lifting disks 72 are driven by the second lifting drive device to perform a lifting operation of a predetermined stroke. The lifting tray 72 is a conveyor belt transfer or pushing mechanism for transferring the tray 2 onto the fixed conveyor belt 71. The arrangement of the ascending mechanism 6 and the descending mechanism 7 of the drying device 4 enables the offset press to utilize the longitudinal space more reasonably, and the equipment length of the offset press can be shortened to 4-5 meters, so that the equipment length of the offset press is effectively shortened, the occupied area of the equipment is reduced, the space utilization rate is effectively improved, the applicability of the field is changed, and the production cost is reduced.

With continued reference to fig. 1, the exhaust mechanism 8 is fixedly mounted on the housing 41, the exhaust mechanism 8 includes an exhaust fan 81 and an exhaust passage 82, the exhaust fan 81 is used for exhausting the air in the housing 41 to the exhaust passage 82, a deodorization mechanism 83 is disposed in the exhaust passage 82, the deodorization mechanism 83 is preferably a commercially available activated carbon deodorization mechanism 83, and the activated carbon deodorization mechanism 83 has a blocking effect on the exhaust passage 82, so that all the gas in the exhaust passage 82 needs to be treated by the deodorization mechanism 83 to be exhausted to the atmosphere. With continued reference to fig. 1, a photochemical automatic monitoring system 84 is further disposed in the exhaust passage 82, the photochemical automatic monitoring system 84 is used for detecting whether the Volatile Organic Compounds (VOCs) in the gas passing through the deodorization mechanism 83 meet the emission standard, and suspending the operation of the apparatus and giving an alarm if the emission standard is not met; waiting for maintenance. The housing 41 further includes an air inlet 410, and the air inlet 410 is configured with a blower for blowing air outside the housing 41 into the housing 41. The air inlet 410 is provided on the side wall of the casing 41 on the lower middle portion of one side of the descending mechanism 7, the exhaust fan 81 is provided on the side wall of the casing 41 on the upper middle portion of the opposite side of the air inlet 410 or on the top of the casing 41, and air is blown from one side of the descending mechanism 7 to one side of the ascending mechanism 6 in the lateral direction. The air inlet 410 is provided with an electric heating source for heating air introduced from the air inlet 410. The air inlet and the exhaust mechanism 8 of the drying device 4 are configured to make the air in the housing 41 flow transversely, which is beneficial to the air sucked by the air inlet 410 to pass transversely from the surface of the offset printing layer to improve the volatilization speed of the solvent, thereby improving the drying efficiency of the offset printing layer; and the air that the air inlet got into is difficult to be discharged by the feed inlet and the discharge gate of casing 41 under the negative pressure for the air that gets into in the casing 41 all passes through exhaust passage 82 and deodorizing mechanism 83's processing discharge, thereby makes drying device 4 carry out deodorizing treatment to the air more comprehensively, makes offset press's operation less to the influence of surrounding environment, uses more environmental protection.

With reference to fig. 1 and 2, the receiving device 5 includes a receiving conveyer 51, a returning conveyer 52, a lifting conveyer 53 and a first lifting driving device; the tray 2 output by the descending mechanism 7 is transmitted back to the offset printing device 3 in the back direction sequentially through the receiving conveyer belt 51, the back conveying conveyer belt 52 and the lifting conveyer belt 53; or, the tray 2 output by the descending mechanism 7 is sequentially conveyed to the next offset printing machine through the material receiving conveying belt 51 and the lifting conveying belt 53 in the output direction; the first lifting driving device is used for lifting the lifting conveyer belt 53 to the level of the feeding hole of the shell 41. Referring to fig. 3, each of the first elevation driving device and the second elevation driving device includes a guide rod 54, a pulling rope 55 and a direction-changing pulley 56, the lifting conveyer belt 53 and the lifting tray 72 perform an elevation movement along the guide rod 54, one end of the pulling rope 55 is fixedly connected to the lifting conveyer belt 53 and the lifting tray 72, and the other end of the pulling rope 55 is fixedly connected to a power output rod of the cylinder 57 through the direction-changing pulley 56; the cylinder 57 may be replaced by a motor, a cylinder, a lead screw, or other conventional driving means to pull the pull cord 55. The material receiving device 5 is configured to ensure that the operation of the offset printing machine can be selected to be transmitted back to the offset printing machine for single-color overprinting offset printing treatment or be selected to be transferred to another offset printing machine for overprinting treatment of different patterns and colors according to the actual offset printing times of the planar base material on the tray 2; the configuration of the material receiving device 5 enables the offset printing machine to have a modular assembly function, so that the offset printing machine can be conveniently used for orderly arranging and combining a plurality of offset printing machines end to form an offset printing assembly line, and the streamlined production of multiple overprinting with different colors and different patterns is realized.

The ascending mechanism 6 and the descending mechanism 7 of the automatic offset printing press according to the present embodiment operate in the following manner: referring to fig. 1 and 2, as shown by the transfer direction of the tray 2 indicated by a solid arrow in the figure, the offset printing-finished tray 2 is actively transferred to the bottom of the elevating mechanism 6 by the feeding conveyor belt 64, and the trays 2 are moved one by one onto the elevating tray 72, the elevating tray 72 is raised to transfer the tray 2 to the adjacent fixed conveyor belt 71, the fixed conveyor belt receives the trays 2 one by one and transfers the trays 2 one by one onto the next elevating tray 72 in the traveling direction, thus completing the stepwise lifting operation of the tray 2, the tray 2 is conveyed onto the fixed conveyor belt 71 at the top, the fixed conveyor belts 71 at the top of the elevating mechanism 6 and the lowering mechanism 7 may be combined into one belt as shown in fig. 3 and 1, the fixed conveyor belt 71 at the top of the lowering mechanism 7 transfers the tray 2 one by one to the elevating tray 72 at the end thereof, the tray 2 is transferred onto the fixed conveyor belt 71 at the next layer by the elevating tray 72, this completes the step-down operation of the pallet 2. The fixed conveyor belt 71 at the lowermost layer is moved out one by the receiving conveyor belt 51. During the raising and lowering of the tray 2, the air inlet blower and the air discharge mechanism 8 in the housing 41 operate so that air enters the housing 41 through the air inlet, flows laterally and is discharged through the air discharge passage 82, and the flow of air carries away the solvent in the offset layer to dry and cure it.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims

1. The automatic offset press comprises a main frame, and an offset printing device, a drying device and a material receiving device which are sequentially passed by a tray assembled on the main frame, wherein a plane substrate is fixedly arranged in the tray; the method is characterized in that:

the offset printing device is used for performing positioning offset printing on the planar base materials in the trays passing through in sequence; the offset printing device comprises a lifting table, an offset printing plate and a stopping trigger, wherein the pulling trigger is triggered to stop the tray from advancing when the tray enters the offset printing device to a specified position, the lifting table is connected in an aligned mode to lift the tray to the specified position, and the offset printing plate is used for implementing offset printing operation of a primary plane substrate in an aligned mode with the tray;

the drying device comprises a shell, and a lifting mechanism, a descending mechanism and an exhaust mechanism which are assembled in the shell, wherein the shell is fixedly assembled on the main rack; the tray output by the offset printing device sequentially enters a lifting mechanism through a feeding hole of the shell, the lifting mechanism is used for lifting the tray to the top in sequence, the tray at the top sequentially enters the descending mechanism, the descending mechanism is used for descending the tray to a discharging hole of the shell in sequence, and the discharging hole is arranged below the feeding hole;

the lifting mechanism and the descending mechanism respectively comprise a plurality of fixed conveyer belts and lifting disks which are distributed in parallel up and down, the conveying directions of two adjacent layers of fixed conveyer belts are opposite, the tray output by the fixed conveyer belt of the next layer of the lifting mechanism is transferred to the input end of the adjacent fixed conveyer belt of the previous layer through the lifting disks, and the tray output by the fixed conveyer belt of the previous layer of the descending mechanism is transferred to the input end of the adjacent fixed conveyer belt of the next layer through the lifting disks; all the fixed conveying belts are distributed at equal intervals from top to bottom, all the lifting disks of the lifting mechanism are synchronously and ascendingly connected into a whole through a first fixing frame, and all the lifting disks of the descending mechanism are synchronously and ascendingly connected into a whole through a second fixing frame;

the exhaust mechanism is fixedly assembled on the shell and comprises an exhaust fan and an exhaust channel, the exhaust fan is used for exhausting air in the shell to the exhaust channel, a deodorization mechanism is arranged in the exhaust channel, gas in the exhaust channel is exhausted to the atmosphere through the deodorization mechanism, and the deodorization mechanism is an activated carbon deodorization mechanism;

the material receiving device comprises a material receiving conveying belt, a return conveying belt, a lifting conveying belt and a first lifting driving device; the tray output by the descending mechanism is transmitted back to the offset printing device through the receiving conveyer belt, the back conveying belt and the lifting conveyer belt in turn according to the back conveying direction; or the tray output by the descending mechanism is sequentially conveyed to the next offset press through the material receiving conveying belt and the lifting conveying belt in the output direction; the first lifting driving device is used for lifting the lifting conveying belt to the horizontal height of the feeding hole of the shell.

2. The automatic offset printing press as recited in claim 1, wherein: the first lifting driving device and the second lifting driving device respectively comprise a guide rod, a pull rope and a reversing pulley, the lifting conveyer belt and the lifting disc respectively move up and down along the guide rod, one end of the pull rope is fixedly connected with the lifting conveyer belt and the lifting disc, and the other end of the pull rope is fixedly connected with a power output rod of the air cylinder through the reversing pulley.

3. The automatic offset printing press as recited in claim 1, wherein: the shell further comprises an air inlet, the air inlet is provided with a blower, the air inlet is formed in the side wall, on the lower portion of the middle portion of one side of the descending mechanism, of the shell, the exhaust blower is arranged on the side wall, on the upper portion of the middle portion of the opposite face of the air inlet, of the shell or on the top of the shell, and air is blown to one side of the ascending mechanism from one side of the descending mechanism in the transverse direction.

4. The automatic offset printing press as recited in claim 3, wherein: the air inlet is provided with an electric heating source, and the electric heating source is used for heating air entering from the air inlet.