A step-and-repeat machine, a printing production line and a printing production step-and-repeat method

Abstract

The application discloses a kind of skip traction machines, comprising: main traction device, auxiliary traction device and skip driving structure. Main traction device and auxiliary traction device are equipped with traction conveying mechanism. Traction conveying mechanism includes traction roller. Skip driving component is used to drive main traction device to move back and forth relative to auxiliary traction device. The traction roller of the skip traction machine of the application can realize skip traction without reversing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing production equipment, in particular to a skip traction machine, a printing production line and a printing production skip traction method. BACKGROUND

[0002] With the improvement of the printing requirements of printed matters such as packaging boxes, packaging boxes and the like, the printing efficiency and precision of the printing machine are also increasing. At present, the printing production line is generally composed of unwinding machines, printing machines, winding machines and the like.

[0003] For web printing, the intermittent web printing machine has become an important means and way for high-precision and low-cost printing. The intermittent web printing machine needs to adopt intermittent feeding and a little back feeding feeding mode, because the offset plate in the printing group is wrapped on the printing cylinder, and the offset plate wrapped on the printing cylinder is determined by its fixing mode to have a gap and cannot completely wrap the roll surface. Therefore, in order to minimize the waste of the gap part of the offset plate on the paper, intermittent back feeding is needed to compensate for the gap.

[0004] In intermittent printing, the front and rear connection production of the printing machine needs to be connected through the skip traction machine, and the unwinding and winding before and after the printing machine can realize non-stop production while realizing intermittent feeding. The skip traction machine in the prior art drives the traction roller to realize forward and reverse rotation through the traction motor, so as to realize the feeding and back feeding of the web. In such a skip traction machine, the traction motor needs to be continuously and alternately reversed and accurately stopped, which requires a very high traction motor. In actual work, the rotational inertia of the traction roller is large, especially when the printing width is large, the cost of the traction motor is too high, but the problem of short service life cannot be solved. SUMMARY

[0005] The present application aims to provide a skip traction machine to solve one or more technical problems in the prior art, at least to provide a beneficial choice or create conditions.

[0006] The technical scheme adopted to solve the above technical problems is:

[0007] A skip traction machine, comprising: a main traction device, a secondary traction device and a skip driving member; the main traction device and the secondary traction device are both provided with a traction conveying mechanism, the traction conveying mechanism comprises a traction roller extending in the left-right direction in the axial direction, and the skip driving member is provided with a skip driving end in transmission connection with the main traction device and moving the main traction device forward and backward relative to the secondary traction device.

[0008] The step traction machine has at least the following beneficial effects: the printing material can be conveyed by the main traction device and the auxiliary traction device, the step driving member can drive the main traction device to move back and forth relative to the auxiliary traction device, the actual speed of the printing material can be affected by the back-and-forth moving speed of the main traction device and the line speed of the traction roller of the main traction device, and the traction roller can realize step traction without reversing.

[0009] As a further improvement of the above technical solution, the traction conveying mechanism further comprises a traction frame and a traction driving unit, the traction roller is rotatably installed on the traction frame, and the traction driving unit is used to drive the traction roller to rotate. Through the above technical solution, the traction frame provides installation support and connection basis for the traction roller, and the traction driving unit can drive the traction roller to rotate, thereby realizing the traction conveying of the printing material.

[0010] As a further improvement of the above technical solution, the main traction device is arranged above the auxiliary traction device, the traction frame has two vertical plates arranged in pairs left and right, and the traction roller is rotatably arranged between the two vertical plates. Through the above technical solution, the main traction device is arranged above the auxiliary traction device, the traction frames of the main traction device and the auxiliary traction device are arranged in an up-down manner, and the traction frame of the main traction device can be arranged on the upper side of the traction frame of the auxiliary traction device.

[0011] As a further improvement of the above technical solution, the number of the step driving members is two, and the two step driving members are arranged in pairs left and right between the traction frames of the main traction device and the auxiliary traction device. Through the above technical solution, the two step driving members simultaneously drive the left and right sides of the main traction device to synchronously translate, thereby enabling the main traction device to move smoothly.

[0012] As a further improvement of the above technical solution, the traction conveying mechanism further comprises a compression roller, the compression roller is arranged in parallel with the traction roller, and the compression roller is elastically abutted on the outside of the traction roller. Through the above technical solution, the compression roller can press the printing material on the traction roller, thereby avoiding abnormality caused by traction failure of the traction roller to the printing material.

[0013] As a further improvement of the above technical solution, the traction frame is provided with an elastic swing piece, the compression roller is rotatably installed on the elastic swing piece, the elastic swing piece has a rotating end and a connecting end, the rotating end and the connecting end are respectively arranged on the two sides of the compression roller, the rotating end is rotatably connected with the traction frame, and the connecting end is elastically connected with the traction frame. Through the above technical solution, the elastic swing piece can elastically swing relative to the traction frame, thereby driving the compression roller to be elastically pressed on the traction roller.

[0014] As a further improvement of the above technical solution, the auxiliary traction device is further provided with a tensioning roller and a tensioning slide, the tensioning slide is in sliding connection with the traction frame, so that the tensioning slide can move up and down relative to the traction frame, and the tensioning roller is rotatably installed on the tensioning slide. Through the above technical solution, the printing substrate between the traction main roller and the traction auxiliary roller is wound around the tensioning roller, and the tensioning roller and the tensioning slide can tension the printing substrate under the action of gravity.

[0015] The present application also provides a printing production line, comprising: a printing machine and two above-mentioned step traction machines, and the two step traction machines are respectively arranged on the front and rear sides of the printing machine.

[0016] The printing production line provided by the present application has at least the following beneficial effects: the two step traction machines move synchronously, the printing substrate can be conveyed, and the two main traction devices are driven to move backward, so that the printing substrate between the two step traction machines can be step-tracked.

[0017] The present application also provides a printing production step traction method, which step-tracks and conveys the printing substrate between two above-mentioned step traction machines, and specifically comprises the following steps:

[0018] The traction rollers of the main traction device and the auxiliary traction device are respectively a traction main roller and a traction auxiliary roller, and the traction speed of the traction auxiliary roller remains unchanged;

[0019] During the step process, the step driving member drives the main traction device to move backward;

[0020] During the printing process, the step driving member drives the main traction device to move forward, and the sum of the traction speed of the traction main roller and the moving speed of the main traction device is consistent with the traction speed of the traction auxiliary roller.

[0021] The printing production step traction method provided by the present application has at least the following beneficial effects: the traction speed of the traction auxiliary roller remains unchanged, so that the front and rear connection production of the printing traction can be connected with the uniform speed of the printing substrate to realize the connection, and the printing substrate can be unwound and wound without stopping.

[0022] As a further improvement of the above technical solution, during the step process, the speed at which the main traction device moves backward and the traction speed of the traction main roller are controlled according to the position distance requirement of continuous two times of printing. Through the above technical solution, the printing substrate can realize different effects such as back-jumping, stopping or feeding forward during the step process, and meet different printing production requirements. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 is a perspective view of an embodiment of the step traction machine provided by the application;

[0025] Figure 2 is a perspective view of an embodiment of the step traction machine provided by the application;

[0026] Figure 3 is a perspective exploded view of an embodiment of the step traction machine provided by the application;

[0027] Figure 4 is a lateral sectional view of an embodiment of the step traction machine provided by the application;

[0028] Figure 5 is a lateral sectional view of an embodiment of the printing production line provided by the application.

[0029] In the drawings: 10, main traction device; 20, auxiliary traction device; 30, step driving member; 40, base; 100, traction frame; 110, vertical plate; 120, connecting rod; 200, main traction roller; 300, auxiliary traction roller; 400, traction driving unit; 500, pressing member; 510, elastic swing piece; 511, rotating end; 512, connecting end; 520, pressing roller; 600, tensioning member; 610, tensioning slide; 620, tensioning roller. DETAILED DESCRIPTION

[0030] This part will describe the specific embodiments of the application in detail, the preferred embodiments of the application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the application, but it cannot be understood as a limitation on the protection scope of the application.

[0031] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0032] In the description of the application, if there is a word such as "several" or the like, the meaning is one or more, the meaning of more than two is more than two, greater than, less than, more than, etc. is not included in the number, above, below, within, etc. is understood to include the number.

[0033] In the description of the present application, unless otherwise explicitly defined, the words such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0034] Referring to Figures 1 to 5 The skip traction machine of the present application is made as follows:

[0035] A skip traction machine comprises a main traction device 10, a secondary traction device 20, a skip driving member 30 and a base 40.

[0036] The secondary traction device 20 is arranged on the upper side of the base 40. The main traction device 10 is arranged above the secondary traction device 20. The main traction device 10 and the secondary traction device 20 are slidably connected in the front-rear direction. The skip driving member 30 is provided with a skip driving end which is drivingly connected with the main traction device 10 and moves the main traction device 10 relative to the secondary traction device 20 in the front-rear direction.

[0037] Both the main traction device 10 and the secondary traction device 20 are provided with a traction conveying mechanism.

[0038] The traction conveying mechanism comprises a traction frame 100, a traction roller and a traction driving unit 400.

[0039] The traction roller has an axial direction extending in the left-right direction, and is rotatably mounted on the traction frame 100. The traction driving unit 400 is drivingly connected with the traction roller and rotates the traction roller relative to the traction frame 100.

[0040] In the present embodiment, the traction frame 100 comprises upright plates 110 and connecting rods 120. The number of the upright plates 110 is two, and they are arranged in pairs on the left and right sides. The connecting rods 120 are in plurality. The plurality of connecting rods 120 are arranged between the two upright plates 110. The left and right ends of the connecting rods 120 are fixedly connected with the two upright plates 110, respectively.

[0041] In the secondary traction device 20, the traction frame 100 is fixedly mounted on the base 40, and the two upright plates 110 of the traction frame 100 are fixedly mounted on the upper side of the base 40, respectively. The base 40 can provide a mounting and fixing basis for the secondary traction device 20, so as to avoid the secondary traction device 20 from shaking when the main traction device 10 moves in the front-rear direction, thereby affecting the front-rear skip precision.

[0042] In order to reduce the weight of the main traction device 10, reduce the inertia and avoid the skip driving member 30 from being overloaded, the traction frame 100 of the main traction device 10 is made of aluminum alloy, and the upright plates 110 and the connecting rods 120 are both made of aluminum alloy.

[0043] The traction roller is arranged between the two vertical plates 110. In order to facilitate the control of the speed and accuracy of the conveying, the traction driving unit 400 of the main traction device 10 is a servo motor. In the auxiliary traction device 20 or other embodiments, the traction driving unit 400 can be a stepping motor or a pneumatic motor.

[0044] The traction conveying mechanism further comprises a pressing member 500.

[0045] The pressing member 500 comprises an elastic swing piece 510 and a pressing roller 520. The axis of the pressing roller 520 extends in the left-right direction. The pressing roller 520 is arranged between the two vertical plates 110 and parallel to the traction roller.

[0046] The elastic swing piece 510 has two. The two elastic swing pieces 510 are respectively arranged at the left and right ends of the pressing roller 520. The two elastic swing pieces 510 are respectively arranged on the side of the two vertical plates 110 facing each other and are rotatably connected to the corresponding vertical plate 110.

[0047] The elastic swing piece 510 has a rotating end 511, a mounting portion, and a connecting end 512. The left and right ends of the pressing roller 520 are respectively rotatably mounted to the mounting portion of the two elastic swing pieces 510. The rotating end 511 is rotatably connected to the vertical plate 110. The connecting end 512 is elastically connected to the traction frame 100, so that the elastic swing piece 510 swings towards the traction roller, thereby elastically abutting the pressing roller 520 on the outside of the traction roller.

[0048] In the main traction device 10 of the embodiment, the pressing roller 520 is arranged on both sides of the traction roller. In the auxiliary traction device 20 of the embodiment, the pressing roller 520 is arranged on the upper side of the traction roller.

[0049] The rotating end 511 and the connecting end 512 of the elastic swing piece 510 are respectively arranged on the front and rear sides of the traction roller. The upper and lower sides of the connecting end 512 are respectively provided with a cylinder connected to the traction frame 100. The cylinders on the upper and lower sides of the connecting end 512 can drive the connecting end 512 to move up and down relative to the traction frame 100, so that the elastic swing piece 510 can swing around the rotating end 511, thereby allowing the pressing roller 520 mounted on the elastic swing piece 510 to approach or move away from the traction roller. In particular, the cylinder for pressing the pressing roller 520 on the outside of the traction roller is a gas bag type cylinder. The gas bag type cylinder has the advantages of low design height, no need for adapter on both sides, no friction, good fatigue performance, high safety in work, etc.

[0050] The number of the step driving members 30 is two. The two step driving members 30 are arranged in pairs between the main traction device 10 and the traction frame 100 of the auxiliary traction device 20.

[0051] In the embodiment, the step driving members 30 are linear modules arranged in the front-rear direction. The linear module is also called linear module, linear slide, etc. It integrates linear slide rail and ball screw, and has high movement speed and high repeat positioning accuracy. In the embodiment, the step driving members 30 drive the linear module through a servo motor, so as to drive the main traction device 10 to move forward and backward relative to the auxiliary traction device 20.

[0052] The two step driving members 30 are arranged between the traction frame 100 of the main traction device 10 and the traction frame 100 of the auxiliary traction device 20. The vertical plates 110 of the two traction frames 100 are arranged on the upper and lower sides of the step driving members 30. The left and right step driving members 30 are synchronously driven, so that the main traction device 10 can move in the front-rear direction relative to the auxiliary traction device 20.

[0053] The traction roller in the main traction device 10 is the main traction roller 200, and the traction roller in the auxiliary traction device 20 is the auxiliary traction roller 300.

[0054] In order to avoid that the distance between the main traction roller 200 and the auxiliary traction roller 300 changes when the main traction device 10 moves forward and backward relative to the auxiliary traction device 20, so as to cause the printing material to be excessively tensioned or relaxed, a tensioning member 600 for tensioning the printing material is arranged between the main traction device 10 and the auxiliary traction device 20.

[0055] In the embodiment, the tensioning member 600 is arranged in the auxiliary traction device 20. The tensioning member 600 includes a tensioning slide 610 and a tensioning roller 620. The tensioning slides 610 are arranged in pairs between the two vertical plates 110 of the auxiliary traction device 20. The tensioning slides 610 are connected to the traction frame 100 of the auxiliary traction device 20 in the up-down inclined direction. The two ends of the tensioning roller 620 are rotatably connected to the two tensioning slides 610 arranged in pairs. The printing material between the main traction roller 200 and the auxiliary traction roller 300 is arranged around the tensioning roller 620. The tensioning roller 620 and the tensioning slide 610 can tension the printing material under the action of gravity. When the main traction roller 200 moves forward and backward relative to the auxiliary traction roller 300, the distance between the main traction roller 200 and the auxiliary traction roller 300 changes, and the tensioning roller 620 and the tensioning slide 610 can move up and down to always tension the printing material.

[0056] In further embodiments, the tensioning slide 610 can be elastically connected to the traction frame 100 of the secondary traction device 20 by a spring, and the tensioning slide 610 is pressed against by the elastic force of the spring, so that the tensioning roller 620 can be in contact with the printing substrate between the primary traction roller 200 and the secondary traction roller 300.

[0057] The present application also provides a printing production line. The printing production line comprises a printing machine and a plurality of step traction machines. The number of the step traction machines is two. The two step traction machines are respectively arranged on the front and back sides of the printing machine.

[0058] In the printing production line, the step traction machines can be implemented according to the various examples of the step traction machine described above, and thus will not be described here.

[0059] The printing machine comprises a plate cylinder, a rubber cylinder and a printing cylinder. The printing substrate between the two step traction machines is arranged between the rubber cylinder and the printing cylinder. The plate cylinder and the rubber cylinder are in rolling abutment and rotate synchronously. The plate cylinder and the rubber cylinder are both provided with a step opening.

[0060] The number of the printing machines can be set according to the printing requirements. The printing machines are all arranged between the two step traction machines. The distance between the printing machines is set according to the length of the plate.

[0061] In actual work, the two step traction machines drive the printing substrate to be conveyed. In normal printing, the conveying speed of the printing substrate is consistent with the peripheral speed of the rubber cylinder. When the step opening rotates to the position of the printing cylinder, the step driving member 30 drives the primary traction device 10 to move backward relative to the secondary traction device 20, and the conveying speed of the printing substrate is the vector sum of the linear speed of the primary traction device 10 and the primary traction roller 200.

[0062] The present application provides a printing production step traction method, which is used to convey the printing substrate in the printing machine between the two step traction machines.

[0063] The traction speed of the secondary traction roller 300 remains unchanged. When the step traction is needed, the step driving member 30 drives the primary traction device 10 to move backward. In normal printing, the step driving member 30 drives the primary traction device 10 to reset forward.

[0064] The sum of the traction speed of the primary traction roller 200 and the moving speed of the primary traction device 10 is consistent with the traction speed of the secondary traction roller 300.

[0065] Specifically: the printing line speed of the printing machine is V0, the outer circumferential speed of the main traction roller 200 is V1, and the speed of the forward and backward movement of the main traction device 10 is V2. The outer circumferential speed of the auxiliary traction roller 300 is always kept unchanged with V0.

[0066] The absolute speed of the printing substrate between the two jump traction machines is V3, and V3=V1+V2. In the above formula, V3 is the vector sum of V1 and V2. When the main traction device 10 moves forward relative to the auxiliary traction device 20, V1 and V2 are in the same direction. When the main traction device 10 moves backward relative to the auxiliary traction device 20, V1 and V2 are in opposite directions.

[0067] If the speed V2 of the backward movement of the main traction device 10 is equal to the traction speed V1 of the main traction roller 200, the printing substrate between the two jump traction machines remains stationary relative to the printing machine during the jumping process. Since the total length of the printing plate provided on the plate cylinder cannot cover the entire outer circumferential surface of the printing cylinder, and the acceleration or deceleration rotation of the main traction roller 200 from uniform speed transmission will increase the gap between the two printing positions, this setting is suitable for the case of gap printing.

[0068] If the speed V2 of the backward movement of the main traction device 10 is greater than the traction speed V1 of the main traction roller 200, V3 is backward, and the printing substrate between the two jump traction machines moves backward relative to the printing machine during the jumping process. The backward movement of the printing substrate can offset the gap generated when the main traction roller 200 changes from uniform speed transmission to acceleration or deceleration rotation. Similarly, if the backward displacement of the printing substrate is sufficient, it can also offset the blank paragraph on the plate cylinder, so that the pattern positions of the two prints can be connected end to end or partially overlapped, realizing seamless continuous printing.

[0069] If the speed V2 of the backward movement of the main traction device 10 is less than the traction speed V1 of the main traction roller 200, V3 is forward, and the printing substrate between the two jump traction machines is conveyed forward during the jumping process. The forward movement of the printing substrate can increase the distance between the two printing positions, which is suitable for the case of printing with a certain distance.

[0070] The jump process is completed in the rotation of the jump port to correspond to the impression cylinder, after the jump is completed, the rubber cylinder and the outer periphery of the impression cylinder abut each other, at this time, V3=V0, the printing substrate is uniformly conveyed for printing. In this process, the jump drive member 30 drives the main traction device 10 to move forward and reset, at this time, V1 and V2 are in the same direction, V1 is less than V3 and V0. The main traction device 10 stops after completing the reset, at this time, V2=0, V1=V3=V0, until the next jump is performed. Repeat this way to realize the jump traction conveying of the printing production. There is no need to repeatedly reverse the conveying before and after the printing process, and non-stop production can be realized.

[0071] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can make various changes, modifications, replacements and variations to the embodiments without departing from the principles and spirit of the present application, and these changes, modifications, equivalent variations or replacements are included in the scope defined by the claims of the present application and its equivalents. The scope of the present application is defined by the claims and its equivalents.

Claims

1. A step-pull traction machine, characterized in that: include: Main traction device (10), auxiliary traction device (20) and step drive component (30); Both the main traction device (10) and the auxiliary traction device (20) are provided with traction conveying mechanisms. The traction conveying mechanism includes traction rollers extending to the left and right. The step-driving component (30) is used to drive the main traction device (10) to move back and forth relative to the auxiliary traction device (20). The traction conveying mechanism further includes a traction frame (100) and a traction drive unit (400), the traction roller is rotatably mounted on the traction frame (100), and the traction drive unit (400) is used to drive the traction roller to rotate; The auxiliary traction device (20) is also provided with a tension roller (620) and a tension slide (610). The tension slide (610) is slidably connected to the traction frame (100) so that the tension slide (610) can move up and down relative to the traction frame (100). The tension roller (620) is rotatably mounted on the tension slide (610).

2. The step-traction machine according to claim 1, characterized in that: The main traction device (10) is located above the auxiliary traction device (20), and the traction frame (100) has two upright plates (110) arranged in pairs on the left and right, and the traction roller is rotatably located between the two upright plates (110).

3. The step-traction machine according to claim 2, characterized in that: The number of the step-driving components (30) is two, and the two step-driving components (30) are arranged in a left-right pair between the traction frame (100) of the main traction device (10) and the auxiliary traction device (20).

4. The step-traction machine according to claim 1, characterized in that: The traction conveying mechanism also includes a pressure roller (520), which is arranged parallel to the traction roller and elastically abuts against the outside of the traction roller.

5. The step-traction machine according to claim 4, characterized in that: The traction frame (100) is provided with an elastic swing member (510), and the pressure roller (520) is rotatably mounted on the elastic swing member (510). The elastic swing member (510) has a rotating end (511) and a connecting end (512). The rotating end (511) and the connecting end (512) are respectively located on both sides of the pressure roller (520). The rotating end (511) is rotatably hinged to the traction frame (100), and the connecting end (512) is elastically connected to the traction frame (100).

6. A printing production line, characterized in that: include: The printing press and two step-traction machines as described in any one of claims 1 to 5, wherein the two step-traction machines are respectively located on the front and rear sides of the printing press.

7. A skip-step traction method for printing production, characterized in that: The printing substrate between two devices is conveyed by skip-step traction conveyor as described in any one of claims 1 to 5, specifically including the following steps: The traction rollers of the main traction device (10) and the auxiliary traction device (20) are respectively the main traction roller (200) and the auxiliary traction roller (300), and the traction speed of the auxiliary traction roller (300) remains constant. During the jumping process, the jumping drive component (30) drives the main traction device (10) to move backward; During the printing process, the step-driving component (30) drives the main traction device (10) to move forward, and the sum of the traction speed of the main traction roller (200) and the moving speed of the main traction device (10) is consistent with the traction speed of the auxiliary traction roller (300).

8. The printing production skip-step traction method according to claim 7, characterized in that: During the step-by-step process, the speed at which the main traction device (10) moves backward and the traction speed of the traction main roller (200) are controlled according to the position spacing requirements of two consecutive printings.

Images