Printer

Abstract

The utility model provides a printer which can restrain a nozzle from contacting with an arched base material. The printer comprises a material storage part used for storing a roll-shaped base material; a transport unit provided in front of the storage unit and capable of continuously transporting the base material forward; the printing platform is arranged in front of the conveying part and is used for holding the base material conveyed by the conveying part; a printing unit provided above the printing platform, the printing unit including a driving unit and a head mounted on the driving unit, the head being driven by the driving unit in a direction orthogonal to a direction in which the substrate is transported; and a detection sensor which is mounted on the drive unit, is electrically connected to the drive unit, is driven by the drive unit in a direction orthogonal to the direction in which the base material is transported, and detects the height of the base material.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to a printer. Background Art

[0002] Printers are widely used in office settings, personal use scenarios, etc. There are various types of printers. For example, among existing printers, there is an UV printer (Ultraviolet LED Inkjet Printer). The UV printer is a plate-free full-color digital printer. The printer can print color photo-quality prints on the surface of objects such as T-shirts, glass, plates, films, etc. without being restricted by materials. For example, the printer prints the required graphics and texts on a substrate (object) and forms patterns, etc.

[0003] For example, when printing on an object such as a film (e.g., a transfer film) (such as printing a DTF heat transfer), in order to store more substrates (such as films), the film is usually configured in a roll shape. While feeding the film through a feeding device, the surface of the film is printed simultaneously. However, due to various reasons such as jamming and friction, the film may slightly arch when being fed out. Since the print head of the printer is very close to the surface of the film, in the case where the film arches, the film may come into contact with the print head of the printer, which may cause the ink mixture attached to the surface of the film to contaminate the print head of the printer. In addition, since the nozzle holes of the print head are very small, for example, nozzle holes of 20 - 50 microns, which are smaller than a hair, therefore, in the case where the print head is contaminated with the ink mixture, the nozzle holes may be blocked, and the blocked nozzle holes are difficult to unclog. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the known technology to some extent. For this purpose, the utility model provides a printer that can prevent the print head from contacting the arched substrate.

[0005] The printer of the utility model includes: a printing platform for holding a substrate; a printing unit disposed above the printing platform, the printing unit including: a driving unit and a print head mounted on the driving unit, the print head being driven by the driving unit along a preset printing direction; a detection sensor mounted on the driving unit and electrically connected to the driving unit, being driven by the driving unit together with the print head, the detection sensor being used to detect the height of the substrate.

[0006] In the printer of the present utility model, since a detection sensor for detecting the height of the substrate is provided, when the substrate (such as a film) arches and exceeds the preset height, a signal for stopping the operation of the printing unit can be output according to the signal input by the detection sensor, thereby preventing the nozzle from contacting the arched substrate.

[0007] In some embodiments, it further includes: a storage section for storing the substrate in a roll shape; a conveying section disposed in front of the storage section, which can continuously convey the substrate forward to the printing platform.

[0008] In some embodiments, the printing unit further includes a mounting seat for mounting the nozzle, and the detection sensor is mounted on the mounting seat.

[0009] In some embodiments, the detection sensor is a non-contact sensor.

[0010] In some embodiments, the detection sensor is a photoelectric sensor based on the reflection of light by ink.

[0011] In some embodiments, there are multiple detection sensors, and the multiple detection sensors are spaced apart along a direction orthogonal to the preset printing direction.

[0012] In some embodiments, the detection sensor is disposed on one side of the nozzle along the preset printing direction.

[0013] In some embodiments, the mounting seat is formed with an avoidance groove penetrating the lower surface. In a bottom view, the surface of the nozzle formed with nozzle holes is exposed from the avoidance groove and does not protrude from the lower surface; the distance between the lower surface and the surface of the nozzle formed with nozzle holes along the inkjet direction of the nozzle is 0.3 mm or more and 1 mm or less.

[0014] In some embodiments, limiting plates are provided on both sides of the printing platform along a direction orthogonal to the direction in which the substrate is conveyed. The limiting plates limit the substrate along the inkjet direction of the nozzle; the limiting plates have limiting portions, and a gap allowing the substrate to pass through is formed between the limiting portions and the upper surface of the printing platform.

[0015] In some embodiments, the printing platform is formed with a mounting groove extending along a direction orthogonal to the direction in which the substrate is conveyed;

[0016] The limiting plate is adjustably mounted to the printing platform along a direction orthogonal to the direction in which the substrate is conveyed through the mounting groove. Description of the Drawings

[0017] Figure 1It is a perspective view of the right view of an embodiment of the printer of the present utility model.

[0018] Figure 2 Is Figure 1 The perspective view of the left view direction of the printer.

[0019] Figure 3 Is Figure 1 The perspective view of the rear view direction of the printer.

[0020] Figure 4 It is a schematic diagram of an embodiment of the limiting plate.

[0021] Figure 5 Is Figure 1 The schematic diagram of the mounting seat of the printing part and the components mounted on the mounting seat. Specific embodiments

[0022] The concept and technical effects generated by this embodiment will be clearly and completely described below in combination with the embodiments to fully understand the purpose, features and effects of this embodiment. Obviously, the described embodiments are only part of the embodiments of this embodiment, rather than all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this embodiment without creative work belong to the scope protected by this embodiment.

[0023] In the description of the embodiments of this embodiment, if it involves orientation description, such as "upper", "lower", "front", "rear", "left", "right", etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this embodiment.

[0024] In the description of this embodiment, if a certain feature is referred to as "set", "fixed", "connected", "installed" on another feature, it can be directly set, fixed, connected on another feature, or indirectly set, fixed, connected, installed on another feature. In the description of the embodiments of this embodiment, if it involves "several", its meaning is more than one. If it involves "multiple", its meaning is more than two. If it involves "greater than", "less than", "exceeding", it should be understood as not including the number itself. If it involves "above", "below", "within", it should be understood as including the number itself. If it involves "first", "second", it should be understood as used to distinguish technical features, rather than indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0025] Reference Figures 1 to 5 and mainly referring to Figure 1 and Figure 2 , the printer of the embodiment includes: a material storage unit 100, a conveying unit 101, a printing platform 103, a printing unit 104 and a detection sensor 105. The material storage unit 100 is used for storing the base material 200 in a roll shape. The conveying unit 101 is arranged in front of the material storage unit 100 and can continuously convey the base material 200 forward. The printing platform 103 is arranged in front of the conveying unit 101 and holds the base material 200 conveyed by the conveying unit 101. The printing unit 104 is arranged above the printing platform 103. The printing unit 104 includes: a driving unit 106 and a nozzle 107 mounted on the driving unit 106. The nozzle 107 is driven by the driving unit 106 in a preset printing direction, for example, in a direction orthogonal to the direction in which the base material 200 is conveyed (the left-right direction in the drawing). The detection sensor 105 is mounted on the driving unit 106 and is electrically connected to the driving unit 106. The detection sensor 105 is driven by the driving unit 106 in a direction orthogonal to the direction in which the base material 200 is conveyed. The detection sensor 105 is used for detecting the height of the base material 200.

[0026] In the printer of the embodiment, since the detection sensor 105 for detecting the height of the base material 200 is provided, when the base material 200 (such as a thin film) arches and exceeds the preset height, a signal for stopping the operation of the printing unit 104 can be output according to the signal input by the detection sensor 105, thereby preventing the nozzle 107 from contacting the arched base material 200.

[0027] Specifically, for example, the distance at which the nozzle 107 can print the surface of the base material 200 with high quality is, for example, 2 mm to 2.5 mm, that is, the distance between the surface of the nozzle 107 with nozzle holes formed and the surface of the base material 200 is set to 2 mm to 2.5 mm. When the height of the arched base material 200 exceeds 2.5 mm (i.e., the preset height), the base material 200 may contact the surface of the nozzle 107 with nozzle holes formed, which may cause the ink mixture attached to the surface of the base material 200 to contaminate the nozzle 107 of the printer. In the printer of the present embodiment, while the driving unit 106 drives the nozzle 107, the driving unit 106 also drives the detection sensor 105 so that the detection sensor 105 keeps detecting the height of the area of the base material 200 to be printed. When the height of the base material 200 detected by the detection sensor 105 exceeds 2.5 mm, the detection sensor 105 inputs a signal to the controller (not shown) of the printer, and the controller outputs a signal for stopping the driving unit 106 from driving the nozzle 107 to move, thereby preventing the nozzle 107 from contacting the base material 200 with an arched height exceeding 2.5 mm. In addition, the controller can also output an alarm signal to remind the operator to take active intervention, such as manually flattening the coil, etc., and then resetting.

[0028] In addition, it should be noted that control methods such as the controller outputting signals for controlling the start and stop actions of other actuators based on the input signals of the detection sensor 105 electrically connected to the controller are well-known common knowledge and are not within the protection scope of the present utility model. Therefore, no detailed description will be given here.

[0029] The printer of the embodiment as a whole includes a machine table 108, and a printing area is provided in the middle of the machine table 108. The material storage part 100 is mounted on the rear side of the machine table 108, that is, the material storage part 100 is located behind the printing area. The material storage part 100 includes two support frames 109 arranged at intervals in the left-right direction on the rear side of the machine table 108. In the incoming material state, the base material 200 is held on the core shaft 110 in a wound state. The base material 200 is rotatably held on the support frame 109 through the core shaft 110.

[0030] The conveying part 101 includes a first clamping roller 111 and a plurality of second clamping rollers 112 arranged opposite to each other in the up-down direction. The first clamping roller 111 is rotatably mounted on the lower part of the machine table 108. The first clamping roller 111 extends in the left-right direction of the machine table 108 and spans the entire printing area. The first clamping roller 111 is driven by a motor (not marked with a reference numeral, such as a stepper motor or a servo motor). The plurality of second clamping rollers 112 are arranged above the first clamping roller 111 and are spaced apart in the left-right direction of the machine table 108. The plurality of second clamping rollers 112 are respectively swingably mounted above the machine table 108 through swing arms 113. The swing arms 113 are swingably mounted above the machine table 108 through mounting arms 114. The second clamping rollers 112 are rotatably mounted at the front ends of the swing arms 113. In addition, the rear ends of the swing arms 113 are hooked by a tension spring 115 in the upward direction. Thus, a downward acting force is applied to the front ends of the swing arms 113, so that the second clamping rollers 112 located at the front ends of the swing arms 113 are kept in a state of abutting against the first clamping roller 111.

[0031] The fed base material 200 is located between the first clamping roller 111 and the plurality of second clamping rollers 112 in the up-down direction. By hooking the rear ends of the swing arms 113 with the tension spring 115, the first clamping roller 111 and the plurality of second clamping rollers 112 are kept in a state of clamping the base material 200. When the motor drives the first clamping roller 111, the base material 200 clamped by the first clamping roller 111 and the plurality of second clamping rollers 112 is continuously fed forward as the first clamping roller 111 rotates.

[0032] Continue to refer to Figure 3 and, for assistance, refer to Figure 1 and Figure 2, between the material storage part 100 and the handling part 101, a guiding plate 116 can be provided. The base material 200 sent out from the material storage part 100 is guided by the guiding plate 116 and passes through the first clamping roller 111 and a plurality of second clamping rollers 112 of the handling part 101, so as to reach the printing platform 103 located in front of the handling part 101.

[0033] Continue to refer to Figures 1 to 3 , in addition, in order to facilitate the loading and unloading of the base material 200, the printer of the embodiment may further include a separating part 117 for separating the plurality of second clamping rollers 112 from the first clamping roller 111. The separating part 117 includes: a rotating rod 118, a plurality of separating cams 119 and a handle 120. The rotating rod 118 extends in the left-right direction and is rotatably mounted on the machine table 108. The plurality of separating cams 119 are fixed on the rotating rod 118 at intervals in the left-right direction, and the plurality of separating cams 119 and the plurality of swing arms 113 correspond to each other in the left-right direction and respectively abut against the rear ends of the corresponding swing arms 113. The handle 120 is arranged outside the machine table 108 and is connected to the rotating rod 118. When the handle 120 is swung, the rotating rod 118 is rotated, so that the separating cam 119 rotates around the rotating rod 118. And, as the separating cam 119 rotates, the rear end of the swing arm 113 is pressed downward against the acting force of the tension spring 115, whereby the front end of the swing arm 113 swings upward, so as to separate each second clamping roller 112 from the first clamping roller 111. In a state where each second clamping roller 112 and the first clamping roller 111 are separated in the up-down direction, it is possible to easily load and unload the base material 200 that needs to pass between them.

[0034] The printing platform 103 is arranged at a position approximately in the middle of the printing area of the machine table 108 and is located in front of the handling part 101. The base material 200 carried by the handling part 101 in the forward direction is held on the printing platform 103. The printing platform 103 is, for example, a plate-shaped member and is mounted on the machine table 108 across the left-right direction of the machine table 108. The printing platform 103 is formed with a mounting groove 121 extending in a direction orthogonal to the direction in which the base material 200 is carried (the left-right direction in the drawing). The mounting groove 121 is, for example, a T-shaped groove and penetrates the printing platform 103 in the left-right direction.

[0035] On both sides of the printing platform 103 in the direction orthogonal to the direction in which the substrate 200 is conveyed (i.e., the left-right direction), there are provided limiting plates 122, and the limiting plates 122 limit the substrate 200 along the inkjet direction of the print head 107. The limiting plates 122 are adjustably mounted to the printing platform 103 through the mounting grooves 121 of the printing platform 103 in the direction orthogonal to the direction in which the substrate 200 is conveyed (i.e., the left-right direction). The mounting positions of the two limiting plates 122 are not particularly limited as long as they do not interfere with the substrate 200 and can limit the substrate 200 in the up-down direction. The limiting plate 122 is, for example, bent into a substantially Z shape by a thin metal plate. The limiting plate 122 has a base portion 123 and a limiting portion 124. The base portion 123 is mounted to the mounting groove 121 of the printing platform 103 through, for example, a T-bolt. In addition, in a state where the base portion 123 is in contact with the upper surface of the printing platform 103, a gap allowing the substrate 200 to pass through is formed between the limiting portion 124 and the upper surface of the printing platform 103. The height of this gap can be 0.8 mm or more and 1.2 mm or less. In addition, the length of the limiting portion 124 extending in the left-right direction is, for example, 5 mm or more and 15 mm or less.

[0036] Continue to refer to Figure 1 and Figure 4 , by providing the limiting plates 122 on both sides of the printing platform 103, the substrate 200 on the printing platform 103 can be restricted and guided, and the substrate 200 can be prevented from arching up from the printing platform 103 due to yaw or other reasons. Further, by making the gap allowing the substrate 200 to pass through be 0.8 mm or more and 1.2 mm or less, while enabling the substrate 200 to smoothly pass through the gap, the excessive arching of the middle part of the substrate 200 in the left-right direction can be suppressed. For example, when the gap is less than 0.8 mm, the space for the substrate 200 to float up and down on the printing platform 103 is too small, which may cause the substrate 200 to get stuck on the printing platform 103. When the gap is greater than 1.2 mm, the space for the substrate 200 to float up and down on the printing platform 103 is too large, which may cause the height at which the middle part of the substrate 200 can arch up on the printing platform 103 to be too large. In addition, by making the length of the limiting portion 124 be 5 mm or more and 15 mm or less, while reliably restricting the substrate 200, the area of the substrate 200 covered can be reduced. When the length of the limiting portion 124 is less than 5 mm, it may cause the limiting portion 124 to be unable to reliably restrict the substrate 200, resulting in the substrate 200 slipping out from this gap. When the length of the limiting portion 124 is greater than 15 mm, it may overly cover the substrate 200, affecting the area where the substrate 200 can be printed. In addition, by making the limiting plate 122 adjustable in the left-right direction of the printing platform 103, it can be adjusted according to the width of the substrate 200 in the left-right direction, improving the versatility of the printer.

[0037] The printing unit 104 is installed on the upper part of the machine table 108. The printing unit 104 includes a single-axis manipulator (not labeled in the drawings) that is driven in the left-right direction as the driving unit 106. The single-axis manipulator can be a commercially available slide table module driven by a motor, or a single-axis manipulator built on the upper part of the machine table 108 through, for example, a slide rail and a synchronous belt transmission mechanism. The driving stroke of the single-axis manipulator spans the entire printing area.

[0038] Continue to refer to Figure 1 , Figure 2 and Figure 5 , in addition, the printing unit 104 includes a mounting base 125 for mounting the nozzle 107. The mounting base 125 is mounted on a slider (not shown) of the single-axis manipulator that serves as the driving unit 106. The mounting base 125 includes a first plate member 126 directly mounted to the slider, a second plate member 127 mounted to the lower side of the first plate member 126, and reinforcing plates 128 respectively located on both sides of the first plate member 126 and the second plate member 127.

[0039] The mounting base 125 is formed with an avoidance groove 129 penetrating the lower surface. In a bottom view, the surface of the nozzle 107 where the nozzle holes are formed is exposed from the avoidance groove 129 and does not protrude beyond the lower surface. The avoidance groove 129 is formed in the second plate member 127 of the mounting base 125. The avoidance groove 129 penetrates the second plate member 127 in the up-down direction. The nozzle 107 is mounted on the second plate member 127 of the mounting base 125, and the nozzle 107 is inserted into the avoidance groove 129 in such a manner that the surface where the nozzle holes (not marked with reference numerals) are formed faces downward, and the surface of the nozzle 107 where the nozzle holes are formed does not protrude beyond the lower surface of the second plate member 127 of the mounting base 125. For example, the distance between the lower surface of the second plate member 127 of the mounting base 125 and the surface of the nozzle 107 where the nozzle holes are formed in the inkjet direction (up-down direction) of the nozzle 107 is 0.3 mm or more and 1 mm or less. In other words, when printing on the surface of the substrate 200, the distance between the lower surface of the second plate member 127 and the surface of the substrate 200 is smaller than the distance between the surface of the nozzle 107 where the nozzle holes are formed and the surface of the substrate 200. Thus, even if the substrate 200 bulges, it will contact the lower surface of the second plate member 127, thereby being able to prevent the substrate 200 from contacting the surface of the nozzle 107 where the nozzle holes are formed. Further, by making this distance 0.3 mm or more, it is possible to reliably prevent the situation where the substrate 200 contacts both the lower surface of the second plate member 127 and the surface of the nozzle 107 where the nozzle holes are formed. By making this distance 1 mm or less, it is possible to slightly increase the distance from the lower surface of the second plate member 127 to the surface of the substrate 200. For example, the distance at which the nozzle 107 can print on the substrate 200 with high quality is, for example, 2 mm to 2.5 mm. This distance (2 mm to 2.5 mm) = the distance between the lower surface of the second plate member 127 and the surface of the substrate 200 + the distance between the lower surface of the second plate member 127 and the surface of the nozzle 107 where the nozzle holes are formed. By making the distance between the lower surface of the second plate member 127 and the surface of the nozzle 107 where the nozzle holes are formed 1 mm or less, it is possible to make the distance between the lower surface of the second plate member 127 and the surface of the substrate 200 1 mm or more and 2.2 mm or less. Therefore, it is possible to slightly increase the distance from the lower surface of the second plate member 127 to the substrate 200 and prevent the driving unit 106 from hitting the substrate 200 when driving the mounting base 125 to move.

[0040] The detection sensor 105 is installed on the mounting base 125. More specifically, the detection sensor 105 is disposed on one side of the print head 107 along a preset printing direction, that is, a direction orthogonal to the preset direction, that is, a direction orthogonal to the direction in which the substrate 200 is conveyed (the left-right direction in the drawings). Further, the detection sensor 105 is installed on the forward side of the driving unit 106 in the advancing direction during printing, compared with the print head 107. In other words, for example, in the drawings, when the driving unit 106 drives the print head 107 to print along the left side, the detection sensor 105 is installed on the left side of the print head 107. For example, the detection sensor 105 is installed on the reinforcing plate 128 on the left side of the mounting base 125. By installing the detection sensor 105 on the forward side of the driving unit 106 in the advancing direction during printing, compared with the print head 107, it is possible to ensure that the detection sensor 105 is located above the substrate 200 prior to the print head 107, thereby determining in advance whether the substrate 200 is arched and suppressing contact between the arched substrate 200 and the print head 107.

[0041] The detection sensor 105 can be a non-contact sensor. As a non-contact sensor, for example, a reflection type photoelectric sensor or a transmissive photoelectric sensor can be cited. As a reflection type photoelectric sensor, for example, it can be a photoelectric sensor based on the reflection of light by the ink. Since the substrate 200 may be transparent, by selecting such a photoelectric sensor based on the reflection of light by the ink, the detection sensitivity of the detection sensor 105 can be improved.

[0042] A plurality of detection sensors 105 can be included. The plurality of detection sensors 105 are spaced apart along the direction in which the substrate 200 is conveyed. For example, in the embodiment, the detection sensor 105 includes two, and the two detection sensors 105 are spaced apart in the front-rear direction. In addition, the two detection sensors 105 can be distributed such that the detection sensor 105 located at the rear is located further to the rear of the print head 107, and the detection sensor 105 located at the front is located further to the front of the print head 107. In other words, the detection sensors 105 are distributed to straddle the printing area of the print head 107 in the front-rear direction. Thus, it is possible to determine in advance whether the substrate 200 is arched along the feeding direction of the substrate 200, and to determine whether the conveyed substrate 200 is arched after printing, thereby being able to expand the detection range of the detection sensor 105 and suppressing contact between the arched substrate 200 and the print head 107.

[0043] In addition, it should be noted that in the above description, although the printer is described as a roll printer, it is not limited thereto. For example, the printer can also be a printer for printing single sheets. In this case, the printer of the embodiment may not include the storage unit 100 and the conveying unit 101, and the operator can directly place the sheet on the printing platform 103.

[0044] In addition, although the non-contact sensor has been described as an example above, it is not limited thereto. For example, the detection sensor may also be a contact sensor, such as a mechanical travel limit switch or the like.

[0045] Among the various specific technical features described in the above specific embodiments, they can be combined in any way without conflict. For the sake of unnecessary repetition, this embodiment does not separately describe various possible combination methods.

[0046] The above embodiments are only used to illustrate the technical solutions of this embodiment and are not intended to limit it. Any modification or equivalent replacement that does not depart from the scope of this embodiment shall be included in the technical solutions of this embodiment.

Claims

1. A printer, characterized in that, Comprising: A printing platform for holding a substrate; A printing unit disposed above the printing platform, the printing unit comprising: a driving unit and a print head mounted on the driving unit, the print head being driven by the driving unit along a preset printing direction; A detection sensor mounted on the driving unit and electrically connected to the driving unit, and being driven by the driving unit together with the print head, the detection sensor being configured to detect the height of the substrate.

2. The printer according to claim 1, characterized in that, Further comprising: A material storage unit for storing the substrate in a roll form; A handling unit disposed in front of the material storage unit, and capable of continuously transporting the substrate forward to the printing platform.

3. The printer according to claim 1 or 2, characterized in that, The printing unit further comprises a mounting seat for mounting the print head, and the detection sensor is mounted on the mounting seat.

4. The printer according to claim 1 or 2, characterized in that, The detection sensor is a non-contact sensor.

5. The printer according to claim 4, characterized in that, The detection sensor is a photoelectric sensor based on the reflection of light by ink.

6. The printer according to claim 1 or 2, characterized in that, There are a plurality of the detection sensors, and the plurality of detection sensors are spaced apart along a direction orthogonal to the preset printing direction.

7. The printer according to claim 6, characterized in that, The detection sensor is disposed on one side of the print head along the preset printing direction.

8. The printer according to claim 3, characterized in that, The mounting seat is formed with an avoidance groove penetrating the lower surface, and in a bottom view, the surface of the print head formed with nozzle holes is exposed from the avoidance groove and does not protrude from the lower surface; The distance between the lower surface and the surface of the print head formed with nozzle holes along the inkjet direction of the print head is 0.3 mm or more and 1 mm or less.

9. The printer according to claim 2, wherein Restricting plates are provided on both sides of the printing platform along a direction orthogonal to the direction in which the substrate is transported, and the restricting plates restrict the substrate along the inkjet direction of the print head; The restricting plate has a restricting portion, and a gap allowing the substrate to pass through is formed between the restricting portion and the upper surface of the printing platform.

10. The printer according to claim 9, characterized in that, The printing platform is formed with a mounting groove extending along a direction orthogonal to the direction in which the substrate is transported; The restricting plate is adjustably mounted to the printing platform along a direction orthogonal to the direction in which the substrate is transported through the mounting groove.

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