Novel double-sided printer

Abstract

The utility model discloses a novel double-sided printer. Comprising a first passing roller, a second passing roller, a third passing roller, a first cloth feeding roller, a reverse printing trolley, a reverse printing platform, a fourth passing roller, a second cloth feeding roller, a front printing trolley, a front printing platform, a fifth passing roller, a color development box, a sixth passing roller, a seventh passing roller, an eighth passing roller, a cloth discharging roller and a cloth pressing roller which are sequentially arranged in the printing medium conveying direction. The front printing trolley, the front printing platform and the back printing trolley and the back printing platform are located on the different sides of the printing medium respectively. The front face printing trolley and the back face printing trolley are driven by independent alternating current servo motors. A pressing roller is arranged between the first passing roller and the second passing roller; the number of the pressing rollers is two, and the pressing rollers are located on the same axis and can move in the axial direction. According to the utility model, the problems of tedious joining process between cloth roll raw materials, easy dislocation of double-sided printed patterns, incapability of independent single-sided printing and difficulty in feeding of the existing equipment are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of printing equipment, and particularly relates to a new type of duplex printer. Background Art

[0002] For duplex printing, generally two printing components are used to print the two sides of the printing medium respectively. When the existing duplex printing system is printing, one method is to use two groups of printing nozzles to print on both sides of the printing medium simultaneously; another method is to first use one group of printing nozzles to complete the printing on one side and then use the other group of printing nozzles to print the other side.

[0003] As for the duplex printing device disclosed in the utility model patent "A Duplex Printing Device" (Patent No.: 202321766878.7), the following problems exist:

[0004] 1. The connection process between the cloth roll raw materials is cumbersome; in the existing equipment, when one roll of cloth is printed, workers need to use a stapler to connect the head of the new cloth roll to the tail of the old cloth roll, and the operation is relatively cumbersome.

[0005] 2. The duplex printing pattern is prone to misalignment; the cloth roll raw materials generally have uneven cloth roll tension, usually with greater tension in the middle and smaller tension at both sides. Due to the uneven tension across the entire cloth width, the pattern alignment during front and back printing will be inaccurate; since there is a cloth winding roller between the two printing stations in the existing equipment, the length of the cloth between the two printing stations is increased, and due to the deformation of the cloth caused by the force on the cloth surface, the pattern is prone to misalignment during front and back printing.

[0006] 3. It cannot perform single-sided printing independently; in the existing equipment, the duplex printing carriage is driven by the same servo motor and can only perform duplex printing and cannot perform single-sided printing; and since two printing carriages need to be driven by one servo motor, a synchronous belt and belt pulleys need to be added to the mechanical structure, and at this time, the accuracy of the synchronous belt and belt pulleys will affect the printing accuracy.

[0007] 4. Feeding is difficult; since the cloth roll weighs dozens of kilograms, two workers are required to lift the cloth roll to a high place in the existing equipment, and the operation is very laborious. Summary of the Utility Model

[0008] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a new type of duplex printer.

[0009] The technical solution adopted by the utility model is as follows: A new type of duplex printer includes a first guide roller, a second guide roller, a third guide roller, a first cloth feeding roller, a reverse printing carriage, a reverse printing platform, a fourth guide roller, a second cloth feeding roller, a front printing carriage, a front printing platform, a fifth guide roller, a color developing box, a sixth guide roller, a seventh guide roller, an eighth guide roller, a cloth discharging roller and a cloth pressing roller, which are arranged in sequence along the conveying direction of the printing medium;

[0010] The front printing carriage, the front printing platform, the back printing carriage, and the back printing platform are respectively located on different sides of the printing medium;

[0011] Both the front printing carriage and the back printing carriage are driven by independent AC servo motors;

[0012] A pressing roller is provided between the first over-roller and the second over-roller; there are two pressing rollers and they are on the same axis; the pressing roller can move axially.

[0013] Furthermore, an electric sewing device is provided below the cloth roll of the duplex printer, and the electric sewing device can slide on a linear guide rail.

[0014] Furthermore, a feeding device is provided above the electric sewing device. The feeding device includes two large-stroke cylinders, a cloth roll mounting bracket, an air shaft, and a slide rail. The two large-stroke cylinders are vertically arranged below the input end of the printing medium of the device. The top of the piston rod of the large-stroke cylinder is connected to the cloth roll mounting bracket. The cloth roll mounting bracket is movably connected to the slide rail. Both ends of the air shaft are arranged on the cloth roll mounting bracket.

[0015] Furthermore, the feeding device further includes small cylinders, and the small cylinders are respectively arranged on both sides of the cloth roll mounting bracket; small cylinder piston rod insertion holes for inserting the piston rods of the small cylinders are opened on the cloth roll mounting bracket.

[0016] Furthermore, the small cylinder piston rod insertion holes are strip-shaped holes.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. Compared with the existing equipment, the present utility model adds a set of electric sewing device. When replacing the new and old cloth rolls, workers can conveniently connect the new cloth head and the old cloth head through this sewing device;

[0019] 2. The present utility model reduces one cloth winding roller between the two printing stations, thereby reducing the length of the cloth at the first and second printing carriages, which can effectively reduce the deformation caused by the force on the cloth surface, and thus reduce the misalignment of the patterns during front and back printing;

[0020] 3. The present utility model drives the two printing carriages to print the front and back sides of the cloth simultaneously through two AC servo motors, enabling it to print the front and back sides of the cloth simultaneously or print only one side of the cloth separately; it avoids the synchronous belt and synchronous pulley added due to the need to control the two printing carriages simultaneously with one AC servo motor, and improves the printing accuracy;

[0021] 4. The utility model adds two pressing rollers that can move axially to evenly distribute the tension of the raw material roll, so as to adapt to all fabric widths that can be printed on this equipment, and avoid the problem of inaccurate pattern alignment during front and back printing due to uneven tension across the entire fabric width.

[0022] 5. The feeding device is provided on the utility model. By using two large-stroke cylinders, the raw material fabric roll at a low position can be sent to a high position, making it labor-saving and convenient for workers to operate. Brief Description of the Drawings

[0023] Figure 1 is a schematic diagram of the internal structure of the utility model;

[0024] Figure 2 is a schematic three-dimensional structure diagram of the utility model;

[0025] Figure 3 is a schematic diagram of the structure of the AC servo motor in the utility model;

[0026] Figure 4 is a schematic diagram of the structure of the electric sewing device in the utility model;

[0027] Figure 5 is a schematic diagram of the structure of the feeding device in the utility model;

[0028] Figure 6 is a partially enlarged schematic diagram at the feeding device;

[0029] In the figures: 1 - fabric roll, 2 - first guide roller, 3 - pressing roller, 4 - second guide roller, 5 - third guide roller, 6 - first fabric running roller, 7 - fourth guide roller, 8 - second fabric running roller, 9 - fifth guide roller, 10 - sixth guide roller, 11 - seventh guide roller, 12 - eighth guide roller, 13 - fabric output roller, 14 - fabric pressing roller, 15 - color developing box, 16 - reverse printing carriage, 17 - reverse printing platform, 18 - front printing carriage, 19 - front printing platform, 20 - electric sewing device, 21 - feeding device, 211 - large-stroke cylinder, 212 - fabric roll mounting bracket, 213 - air shaft, 214 - slide rail, 215 - small cylinder, 216 - small cylinder piston rod pin hole, 22 - AC servo motor, 23 - linear guide rail. Detailed Implementation Modes

[0030] To make the purpose, technical solutions and advantages of the implementation modes of the utility model clearer, the technical solutions in the implementation modes of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the implementation modes of the utility model. Obviously, the described implementation modes are part of the implementation modes of the utility model, rather than all of the implementation modes. Usually, the components of the implementation modes of the utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] As Figure 1 and Figure 2 shown, the utility model is a double-sided printing device, which includes a first over-roller 2, a second over-roller 4, a third over-roller 5, a first fabric feeding roller 6, a reverse printing carriage 16, a reverse printing platform 17, a fourth over-roller 7, a second fabric feeding roller 8, a front printing carriage 18, a front printing platform 19, a fifth over-roller 9, a color developing box 15, a sixth over-roller 10, a seventh over-roller 11, an eighth over-roller 12, a fabric discharging roller 13 and a fabric pressing roller 14 arranged in sequence along the conveying direction of the printing medium. The raw material of the fabric roll 1 is reversed after passing through the first over-roller 2, the second over-roller 4 and the third over-roller 5, and reaches the reverse printing platform 17 through the first fabric feeding roller 6. The reverse printing carriage 16 prints on the reverse side of the raw material of the fabric roll, and then passes through the fourth over-roller 7 and the second fabric feeding roller 8 to reverse the raw material of the fabric roll and reach the front printing platform 19, where the front printing carriage 18 prints on the front side of the raw material of the fabric roll. The front printing carriage 18, the front printing platform 19 and the reverse printing carriage 16, the reverse printing platform 17 are respectively located on different sides of the raw material of the fabric roll.

[0032] After double-sided printing is completed, the raw material of the fabric roll enters the color developing box 15 through the fifth over-roller 9 for color development. The temperature in the color developing box 15 is generally controlled between 160 - 180 °C. After color development is completed, it passes through the sixth over-roller 10, the seventh over-roller 11, the eighth over-roller 12, the fabric discharging roller 13 and the fabric pressing roller 14 and then discharges the fabric, completing the entire printing process.

[0033] Since the raw material of the fabric roll basically shows uneven fabric winding tension, generally with large tension in the middle and small tension on both sides, due to the uneven tension across the entire fabric width, it will cause inaccurate pattern alignment during front and back printing. In the utility model, a pressing roller 3 is provided between the first over-roller 2 and the second over-roller 4. There are two pressing rollers 3 and they are on the same axis. The two symmetrically distributed pressing rollers 3 rely on gravity to press on the edge of the advertising fabric, adjusting the tension of the raw material of the fabric roll, solving the problem of uneven tension between the middle and both sides of the fabric roll, thereby improving the accuracy of pattern alignment during front and back printing. At the same time, due to different fabric widths for printing, the two pressing rollers 3 can move axially to adapt to all fabric widths that can be printed on this device.

[0034] In the utility model, both the front printing carriage 18 and the reverse printing carriage 16 are driven by independent AC servo motors 22. The advantage of this structure is that it can perform double-sided printing or single-sided printing. The operations of the two printing carriages are independent of each other, solving the problem that existing devices can only perform double-sided printing. At the same time, due to the use of independent servo motors, it avoids the problem of affecting printing accuracy due to adding synchronous belts and belt pulleys in the mechanical structure.

[0035] As Figure 4As shown in the figure, an electric sewing device 20 is provided below the cloth roll 1 of the duplex printer. The electric sewing device 20 is installed on the slider of a linear guide 23, which is convenient for the operator to hold and operate. When the old cloth roll is printed and needs to be replaced with a new one, the worker can easily sew the new cloth head and the old cloth head together through the electric sewing device 20, which is convenient to operate and reduces the waste of advertising cloth heads.

[0036] As Figure 5 and Figure 6 As shown in the figure, a feeding device 21 is provided above the electric sewing device 20. The feeding device 21 includes two large-stroke cylinders 211, a cloth roll mounting bracket 212, an air shaft 213, a slide rail 214 and a small cylinder 215. The two large-stroke cylinders 211 are vertically arranged below the input end of the printing medium of the device. The top of the piston rod of the large-stroke cylinder 211 is connected to the cloth roll mounting bracket 212. The cloth roll mounting bracket 212 is movably connected to the slide rail 214. The two ends of the air shaft 213 are arranged on the cloth roll mounting bracket 212, and the cloth roll 1 is installed on the air shaft 213. A gear is provided at the end of the air shaft 213, which is used to mesh with the gear of the AC servo cloth-releasing motor to drive the air shaft 213 to rotate. The feeding device 21 can send the low-position cloth roll raw material to a high position, making it labor-saving and convenient for the worker to operate. In addition, the force output by the cylinder can reliably position the gear installed at the end of the air shaft 213 at the gear of the AC servo cloth-releasing motor, ensuring the center distance between the gears during the operation of the device and preventing the position change of the air shaft 213, thereby improving the printing accuracy. During operation, the two large-stroke cylinders 211 on the left and right push the cloth roll mounting bracket 212 upward to the working position and firmly press it. However, since the weight of the cloth roll 1 is relatively large, in order to prevent the cloth roll 1 from falling at the high position due to the decrease in the air source pressure, which may endanger the personal safety of the operator, a small cylinder 215 is provided at each end of the device. When the cloth roll mounting bracket 212 is pushed to the high position, the piston rod of the small cylinder 215 extends and inserts into the pin hole 216 of the small cylinder piston rod, so as to prevent the cloth roll 1 from suddenly falling due to various problems during the operation of the device and protect the safety of the operator. In order to facilitate the effective pinning action of the piston rod of the small cylinder 215, the pin hole 216 of the small cylinder piston rod is processed into a strip hole.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A new double-sided printer, characterized in that: The system includes a first roller, a second roller, a third roller, a first cloth roller, a reverse printing carriage, a reverse printing platform, a fourth roller, a second cloth roller, a front printing carriage, a front printing platform, a fifth roller, a color box, a sixth roller, a seventh roller, an eighth roller, a cloth outlet roller and a cloth pressing roller, which are sequentially arranged along the printing medium conveying direction; The front printing carriage, the front printing platform and the back printing carriage, the back printing platform are respectively located on different sides of the printing medium; The front printing carriage and the back printing carriage are both driven by independent AC servo motors; A pressure roller is arranged between the first passing roller and the second passing roller; two pressure rollers are arranged and are on the same axis; and the pressure roller can move in the axial direction.

2. A new double-sided printer according to claim 1, characterized in that: An electric sewing device is provided below the cloth roll of the double-sided printer, and the electric sewing device can slide on the linear guide rail.

3. A new double-sided printer according to claim 2, characterized in that: A feeding device is provided above the electric sewing device, and the feeding device includes two long-stroke cylinders, a cloth roll mounting bracket, an air expansion shaft and a slide rail. The two long-stroke cylinders are vertically arranged below the input end of the printing medium of the device, the top of the piston rod of the long-stroke cylinder is connected to the cloth roll mounting bracket, the cloth roll mounting bracket is movably connected to the slide rail, and both ends of the air expansion shaft are arranged on the cloth roll mounting bracket.

4. A novel double-sided printer according to claim 3, characterized in that: The feeding device also includes a small cylinder, which is respectively arranged on both sides of the cloth roll mounting bracket; the cloth roll mounting bracket is provided with a small cylinder piston rod pin hole for inserting the small cylinder piston rod.

5. A new double-sided printer according to claim 4, characterized in that: The pin hole of the piston rod of the small cylinder is a strip-shaped hole.

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