Drucker

Abstract

A printer is configured to print a viscous fluid onto a target object using a screen mask and to convey and exchange multiple types of exchange devices, including the screen mask. The printer has a pair of first conveying surfaces and a pair of second conveying surfaces. The pair of first conveying surfaces extends in a horizontal direction and is configured to be used to convey the screen mask. The pair of second conveying surfaces extends parallel to an extension direction of the pair of first conveying surfaces and is configured to be used to convey a conveying device to which an exchange device other than the screen mask is attached.

Description

Technical area

[0001] The present description reveals a printer. State of the art

[0002] A conventional printer is known that prints a viscous liquid onto a target object and automatically exchanges a replacement element used in the printer. For example, patent literature 1 discloses a printer with a storage device that holds a replaceable element with a screen mask and transports the replacement element into and out of the printer in a state in which it is positioned in front of the printer. The storage device comprises a storage section configured to hold the screen mask, a conveying device to which another replacement element (a doctor blade or a plate carrier element) is attached, and a conveying conveyor configured to move an element stored in the storage device back and forth.The printer includes a pair of left and right conveyor rails located between a print processing section and a plate mounting section, extending in one direction from front to back. The printer retracts the screen mask from the conveyor rails, retracts the feeder using the conveyor rails to exchange the replacement element, or retracts the screen mask to hold it on the conveyor rails. Citation list for patent literature

[0003] Patent literature 1: WO 2018 / 105016 Summary of the invention: Technical problem

[0004] When the screen mask or conveyor moves between the printer and the storage unit in the printer described above, an outer frame of the screen mask or conveyor and a frame receiving section of the conveyor rails rub against each other and are worn down, producing abrasive powder. When abrasive powder accumulates on the conveyor rails, the conveying friction increases, and there is a risk that the conveying of the screen mask or conveyor could be impeded. Furthermore, if abrasive powder accumulates due to long-term use, the screen mask moves on top of the accumulated powder, which can reduce the flatness of the screen mask.

[0005] A main objective of the present disclosure is to provide a printer with which it is possible to smoothly transport a conveying device to which a screen mask or exchange device is attached, regardless of long-term use. Solution to the problem

[0006] The following means are employed in the present disclosure to achieve the goal described above.

[0007] A printer according to the present disclosure is a printer for printing a viscous fluid onto a target object using a screen mask and for conveying and exchanging several types of exchange devices including the screen mask, wherein the printer comprises: a pair of first conveying surfaces extending in a horizontal direction, wherein the pair of first conveying surfaces is configured to be used to convey the screen mask; and a second conveying surface extending parallel to a direction of extension of the pair of first conveying surfaces, wherein the second conveying surface is configured to be used to convey a conveying device to which another exchange device, different from the screen mask, is attached.

[0008] In the printer described in this disclosure, different conveying surfaces (first conveying surface and second conveying surface) are used for conveying the screen mask and for conveying a different exchange device. By distributing the conveying surfaces, it is possible to reduce the generation of abrasive powder. When the screen mask or the other exchange device is replaced, the conveying device to which the screen mask or the exchange device is attached can transport the material smoothly, regardless of long-term use. Brief description of the characters Fig. Figure 1 is a perspective view of a printer and a mounting rack. Fig. Figure 2 is a side view of the printer and the mounting frame. Fig. Figure 3 is a perspective view of the mounting frame, an exchange frame, and conveyor rails. Fig. Figure 4 is a perspective view of a plate support element and the replacement frame. Fig. Figure 5 is a view showing a movable surface of an exchange frame of a screen mask. Fig. Figure 6 is a view showing a movable surface of the exchange frame of the plate support element. Description of the embodiments

[0009] In the following, an embodiment of the present disclosure is described with reference to the figures.

[0010] Fig. Figure 1 is a perspective view of the printer 10 and the mounting frame 60. Fig. Figure 2 is a side view of the printer 10 and the mounting frame 60. Fig. Figure 3 is a perspective view of the receiving frame 60, the exchange frame 80 and the conveyor rails 40. Fig. Figure 4 is a perspective view of the plate support element 32 and the replacement frame 80. In the Fig. 1 to 3, a left-right direction is called the X-axis, a front-back direction the Y-axis, and an up-down direction the Z-axis.

[0011] The printer 10 of the present embodiment is a device for printing solder paste onto the underlying plate S through a pattern hole formed in the screen mask M, by pressing the solder paste into the pattern hole on the screen mask M using a squeegee 22. The printer 10 forms a production line in combination with a component assembler that mounts an electronic component onto the plate S onto which the solder is printed. Furthermore, when the type of plate S to be produced is changed, the printer 10 can automatically exchange the screen mask M and the plate support element 32, which supports the plate S, according to the type of plate S being produced.

[0012] As in Fig. 1 and Fig. As shown in Figure 2, the printer 10 comprises a printer main body 11, a housing 12 that accommodates the printer main body 11, an exchange device 50, a mounting frame 60, and a control device (not shown) that controls the entire printer. The printer main body 11 includes a head device 20, a plate conveyor 30, a detection section 35, and conveyor rails 40.

[0013] The printhead assembly 20 is installed in an upper section of the printer main body 11. As shown in Fig. As shown in Figure 1, the head device 20 comprises a head main body 21 and a head movement section 26 that moves the head main body 21 in the front-to-back direction (Y-axis direction), which is a pressure direction. The head movement section 26 comprises a guide rail 28 extending in the forward-backward direction, a Y-axis slider 27 moving along the guide rail 28, and a motor (not shown) that drives the Y-axis slider 27. As shown in Figure 1, the head device 20 comprises a head main body 21 and a head movement section 26 that moves the head main body 21 in the front-to-back direction (Y-axis direction), which is a pressure direction. Fig. As shown in Figure 2, the head body 21 comprises a pair of front and rear doctor blades 22, doctor blade lifting and lowering sections 23, each of which is configured, for example, with an air cylinder and raises or lowers the corresponding doctor blade 22, a slide 24, and a slide lifting and lowering section 25, which is configured, for example, with an air cylinder and raises and lowers the slide 24. A pair of doctor blades 22 are plate-shaped elements that extend in the left-right direction (X-axis direction) perpendicular to the printing direction and are inclined so that they are separated from each other, as they extend downwards in the left-right direction.A pair of conveyor rails 40, extending forward and backward, are installed in a central section of the printer main body 11, and the slide 24 is moved forward and backward by the head movement section 26 in a state where it is lowered by the slide lift and lower section 25, thereby moving exchange frames 70, 80, which are located on the conveyor rails 40, by pushing the exchange frames 70, 80 forward and backward. As shown in . Fig. As shown in Figure 2, the exchange frames 70, 80 move inside and outside the housing 12 through a passage opening 36 located in the central section of the front of the housing 12. The passage opening 36 is equipped with a detection sensor 37 that detects the passage of the exchange frames 70, 80.

[0014] The plate conveyor 30 is installed in a lower section of the printer main body 11. The plate conveyor 30 conveys, positions, and supports the plate S and brings the plate S into contact with the screen mask M (rear) and separates it from it. As shown in Fig. As shown in Figure 2, the plate conveyor 30 comprises a plate conveyor section 31 that conveys the plate S in the left-right direction (X-axis direction), a plate support element 32 as a support element that supports the plate S from below, and a plate support element lifting and lowering section 33 that raises and lowers the plate support element 32. The plate support element 32 is replaced with an element whose size is suitable for supporting the plate S, depending on the type of plate S.

[0015] The detection section 35 detects the plate S and the plate support element 32. The detection section 35 detects the position of the plate S by reading a mark attached to the top of the plate S, which is conveyed and positioned by the plate conveyor 30, and it detects the position and size of the plate support element 32 by reading a mark attached to the underside of the plate support element 32, which is carried by the exchange frame 80 on the conveyor rails 40.

[0016] The exchange device 50 receives the receiving frame 60, which receives an exchange element (such as the screen mask M or the plate support element 32) used in the printer main body 11 using exchange frames 70, 80, and transports the exchange device between the receiving frame 60 and the printer main body 11. The exchange device 50 comprises a left unit 51a, which is installed on a left side on a front surface of the printer main body 11, and a right unit 51b, which is installed on a right side on the front surface of the printer main body 11. The left unit 51a and the right unit 51b comprise a frame support element 52, which accommodates a receiving frame 60 and supports a lower surface of the accommodation frame 60 from both the left and the right side, as well as a frame lifting and lowering section 53, which raises and lowers the frame support element 52.The frame lifting and lowering section 53, for example, comprises a combination of a ball screw mechanism and a motor or a linear motor. The receiving frame 60, supported by the frame support element 52, is raised and lowered together with the frame support element 52 and not with the frame lifting and lowering section 53. Furthermore, the left unit 51a and the right unit 51b each contain a frame forward-backward movement section 54, which moves the exchange frames 70, 80 forward and backward in the receiving frame 60 from both the left and right sides by means of a belt, a pulley, or the like.

[0017] As in Fig. As shown in Figure 1, the receiving frame 60 is a receiving body with a pair of left and right support rails 61 arranged in several stages in the top-bottom direction and can accommodate the exchange device in each support rail 61. Furthermore, openings 62 and 63 are formed on the printer main body 11, a front face, and a rear face of the receiving frame 60. The exchange device is removed by a worker or the like through the opening 62 on the front and inserted and removed through the opening 63 on the rear of the frame's forward-backward movement section 54.In a state where the receiving frame 60 is being received by the exchange device 50, the frame forward-backward movement section 54 guides the exchange element, which is supported on support rails 61 positioned at substantially the same height as the conveyor rails 40 of the printer main body 11, through the frame lifting and lowering section 53 between the support rails 61 in several stages of the receiving frame 60 to the printer main body 11. The frame forward-backward movement section 54 guides the exchange device, which is mounted on the conveyor rails 40 of the printer main body 11, to the support rails 61 of the receiving frame 60, which are arranged at substantially the same height as the conveyor rails 40.The receiving frame 60 can be transported by a worker to a receiving position of the exchange device 50 or be mounted on an automated guided vehicle (AGV) and automatically transported by it to the receiving position of the exchange device 50.

[0018] The exchange frame 70 is a frame body that supports the screen mask M. The screen mask M is a thin metal plate and is supported by the exchange frame 70 with a predetermined tension. While supported by the exchange frame 70, the screen mask M is positioned and secured in a work area on the conveyor rails 40 and used for printing.

[0019] As in Fig. As shown in Figure 4, the replacement frame 80 is a frame body that supports the plate support element 32 and has essentially the same left-right width as the replacement frame 70. The replacement frame 80 comprises a rectangular outer frame 81, a pair of support parts 82 attached to the outer frame 81 so that they face each other and support the plate support element 32 from both sides, and a cam plunger 83. Several (e.g., four) cam plungers 83 are rotatably mounted on each of the inner and lower surfaces of the left side section 81a and the right side section 81b of the outer frame 81.

[0020] As in the Fig. 2 and Fig. As shown in Figure 3, the conveyor rails 40 are essentially at the same height as the passage opening 36 (see Figure 3). Fig. 2) are installed in the central section of the printer main body 11 and consist of a pair of left and right longitudinal rails extending from front to back (Y-axis direction). The conveyor rails 40 comprise a pair of left and right primary conveyor surfaces 41, which are used to convey the exchange frame 70 (screen mask M), and a pair of left and right secondary conveyor surfaces 45, which are used to convey the exchange frame 80 (plate support element 32).

[0021] Each pair of left and right first conveying surfaces 41 comprises a flat conveying surface main body 42 extending from front to back, and several support sections 43 arranged at predetermined intervals in the front-to-back direction on the conveying surface main body 42 and projecting beyond the conveying surface main body 42. That is, each first conveying surface 41 comprises a step due to each support section 43. As in Fig. As shown in Figure 5, each support section 43 has a contact surface that comes into contact with a lower surface of the exchange frame 70 (outer frame) of the screen mask M and supports the screen mask M in a horizontal position with the contact surface. Good flatness and height accuracy of the contact surface of the support section 43 are ensured by a cutting process or similar. Accordingly, the flatness of the screen mask M can be more easily guaranteed than in a case where the exchange frame 70 (outer frame) is supported by the main body 42 of the conveyor surface. In addition, a recessed groove 44 is formed around the support section 43, which is set off from the main body 42 of the conveyor surface.Therefore, the abrasive powder generated when the exchange frame 70, which carries the sieve mask M, slides on the support section 43, can be picked up by the recessed groove 44, and it is possible to reduce the adhesion of the abrasive powder to the conveying surface main body 42 and the support section 43.

[0022] A pair of left and right second conveying surfaces 45 are arranged such that they are connected to the inner surfaces of the pair of left and right first conveying surfaces 41, respectively. As shown in Fig. As shown in Figure 6, every second conveying surface 45 is formed by a flat surface without a step, extending in a front-to-back direction at a position below the first conveying surface 41 (conveyor surface main body 42) on the outside. As described above, cam plungers 83 are arranged on the inner and undersides of the left side section 81a and the right side section 81b of the outer frame 81 of the exchange frame 80, and the exchange frame 80 moves along the conveying rails 40 by the cam plungers 83 rolling on the second conveying surfaces 45. As shown in Fig. As shown in Figure 6, a pair of left and right first conveying surfaces 41 (support sections 43) are formed in a state in which the cam tappets 83 are in contact with the second conveying surfaces 45, at positions that are lower than a lower surface of the outer frame 81 of the exchange frame 80. Accordingly, the exchange frame 80 can be conveyed smoothly.

[0023] The side walls 46 are arranged at the inner end sections of the pair of left and right secondary conveying surfaces 45, which are opposite each other. The side walls 46 mainly reduce the falling of abrasive powder that is generated when the exchange frame 80 (plate support element 32) is conveyed on the secondary conveying surfaces 45, onto the plate S, the plate conveyor 30, or similar.

[0024] The screen mask M is exchanged as follows. The printer's control device 10 first controls the slide lifting and lowering section 25 and the head movement section 26 such that the exchange frame 70, located on the first conveying surfaces 41 and carrying the screen mask M, is pushed by the slide 24 so that it moves on the first conveying surfaces 41 and is conveyed out of the housing 12 through the through-opening 36. The control device then controls the exchange device 50 so that the exchange frame 70 is returned to the receiving frame 60. Next, the control device controls the exchange device 50 so that the exchange frame 70, carrying the new screen mask M, is removed from the receiving frame 60 and conveyed through the through-opening 36 into the housing 12.The control device then controls the slide lifting and lowering section 25 and the head movement section 26 so that the retracted exchange frame 70 is pushed through the slide 24 to move onto the first conveying surfaces 41, thereby conveying the exchange frame 70 (new screen mask M) into the working area and positioning the exchange frame 70.

[0025] The plate support element 32 is also replaced if necessary. The plate 32 is replaced in a state where the screen mask M (replacement frame 70) is retracted on the conveyor rails 40 into the receiving frame 60. The printer's control device 10 activates the replacement device 50 so that the empty replacement frame 80 is removed from the receiving frame 60 and conveyed through the through-opening 36 into the housing 12. Subsequently, the control device controls the slide lifting and lowering section 25 and the head movement section 26 so that the empty replacement frame 80, conveyed into the housing 12, is pushed through the slide 24 and moved on secondary conveying surfaces 45, thereby moving the replacement frame 80 into the working area. The control device then controls the plate support element lifting and lowering section 33, so that the plate support element 32 is lifted and transferred to the exchange frame 80 on the second conveying surfaces 45.For the discharge of the plate support element 32, a method described in WO 2018 / 105016 can be used, for example. The control device then activates the slide lifting and lowering section 25 and the head movement section 26 such that the replacement frame 80 is pushed through the slide 24 and moved on the second conveying surfaces 45, and the replacement frame 80 is conveyed out of the housing 12 through the through-opening 36. The control device then activates the exchange device 50 so that the replacement frame 80 is returned to the receiving frame 60. Next, the control device activates the exchange device 50 so that the replacement frame 80, which carries the new plate support element 32, is removed from the receiving frame 60 and conveyed through the through-opening 36 into the housing 12.The control device then controls the lifting and lowering section 25 of the slide and the head movement section 26 such that the replacement frame 80, conveyed into the housing 12, is pushed through the slide 24 and moved onto second conveying surfaces 45, thereby moving the replacement frame 80 (new plate support element 32) into the working area. The control device then controls the plate support element lifting and lowering section 33 of the plate carrier element such that the plate carrier element 32 is raised and the new plate support element 32 is delivered to the plate support element lifting and lowering section 33. The control device then controls the slide lifting and lowering section 25 and the head movement section 26 so that the empty exchange frame 80 is pushed through the slide 24 after the plate support element 32 has been dispensed and moved on the second conveying surfaces 45, and the exchange frame 80 is conveyed out of the housing 12 through the through-opening 36.The control device then controls the exchange device 50 so that the empty exchange frame 80 is returned to the receiving frame 60.

[0026] As described above, in the present embodiment the screen mask M and the plate support element 32 are conveyed over different conveying surfaces (first conveying surfaces 41 and second conveying surfaces 45). This makes it possible to distribute the conveying surfaces and reduce the generation of abrasive powder. When the screen mask M is replaced, the abrasive powder generated, even if it is produced by sliding between the replacement frame 70 and the support sections 43 of the pair of left and right first conveying surfaces 41, is collected in the recessed grooves 44 formed around the support sections 43. Therefore, it is possible to reduce the adhesion and accumulation of abrasive powder on the main conveying surface body 42 and the support sections 43, and it is possible to reduce a decrease in the flatness of the screen mask M caused by the replacement frame 70 moving on the accumulated abrasive powder.Since the replacement frame 80 of the plate support element 32 is conveyed by cam plungers 83 that roll on a pair of left and right secondary conveying surfaces 45, the replacement frame 80 can be conveyed smoothly. Because the pair of left and right secondary conveying surfaces 45 are arranged within the pair of left and right primary conveying surfaces 41 at positions one step lower than the primary conveying surfaces 41, it is possible to reduce the adhesion of the abrasive powder to the primary conveying surfaces 41, even if abrasive powder is generated on the secondary conveying surfaces 45 when the replacement frame 80 is conveyed.Since the side walls 46 are arranged at the inner end sections of the pair of left and right second conveying surfaces 45 facing each other, it is also possible to reduce the falling of the generated abrasive powder onto the plate conveying device 30 or the plate S, even when abrasive powder is generated on the second conveying surfaces 45 when the exchange frame 80 is conveyed.

[0027] Here, a correspondence relationship between the main elements of the embodiment and the main elements of the present disclosure, as described in the claims, is described. That is, the screen mask M and the plate support element 32 of the present embodiment correspond to an exchange device of the present disclosure, the printer 10 corresponds to a printer, the first conveying surface 41 corresponds to a first conveying surface, the exchange frame 80 corresponds to a conveying device, and the second conveying surface 45 corresponds to a second conveying surface. Furthermore, the conveying surface main body 42 corresponds to a conveying surface main body, and the support section 43 corresponds to a support section. The recessed groove 44 corresponds to a recessed section. The cam plunger 83 corresponds to a cam plunger. The side wall 46 corresponds to a side wall.

[0028] It goes without saying that the present disclosure is in no way limited to the embodiment described above and can therefore be practiced in various ways, as long as it falls within the technical scope of the present disclosure.

[0029] In the embodiment described above, the exchange frame 80 is conveyed, for example, by cam plungers 83, which are arranged in the outer frame 81 of the exchange frame 80 and roll on secondary conveying surfaces 45. However, the cam plungers 83 can be omitted, and the exchange frame 80 can be conveyed by sliding on the secondary conveying surfaces 45.

[0030] In the embodiment described above, the pair of left and right second conveying surfaces 45 is arranged inside the pair of left and right first conveying surfaces 41, but can also be arranged outside the pair of left and right first conveying surfaces 41.

[0031] In the embodiment described above, the second conveying surfaces 45 are used to convey the exchange frame 80, to which the plate support element 32 is attached. However, as long as the second conveying surfaces 45 are used in the printer 10, they can also be used to convey an exchange frame (conveyor device) to which a different exchange device (e.g., a doctor blade 22) than the screen mask M is attached. For feeding the doctor blade 22 to the head body 21, when the doctor blade 22 is attached to the exchange frame and conveyed on the second conveying surfaces 45 as an exchange device, the method described in WO 2018 / 105016 can be used, for example.

[0032] In the embodiment described above, the printer of the present disclosure is applied to a printer that prints solder as a viscous liquid onto a plate S as the target object. However, the target object can also be a different base material, e.g., a three-dimensional object, and the viscous liquid can be a conductive paste, an adhesive, or the like.

[0033] As described above, in the printer of the present disclosure, the different conveying surfaces (the first conveying surface and the second conveying surface) are used for conveying the screen mask and for conveying the other exchange device, which is different from the screen mask. The distribution of the conveying surfaces makes it possible to reduce the generation of abrasive powder. Therefore, when the screen mask or the other exchange device is replaced, it is possible to transport the material smoothly on the conveying device to which the screen mask or the exchange device is attached, regardless of long-term use.

[0034] In the printer of the present disclosure, the pair of first conveying surfaces may have steps, and a pair of second conveying surfaces may not have steps. This allows for smooth conveying of the conveying device on the second conveying surfaces. In this case, the pair of first conveying surfaces may comprise conveying surface main bodies and support sections that project as steps in positions higher than the conveying surface main bodies and are configured to support the screen mask in a horizontal position. With this configuration, by ensuring the accuracy of the support sections, the flatness of the screen mask can be advantageously maintained without ensuring the accuracy of the entire first conveying surfaces. Furthermore, in this case, the first conveying surface may have a recessed section that is recessed by the conveying surface main body around the support section.The recessed section can collect abrasive powder that is generated when the screen mask is conveyed using the first conveying surface.

[0035] In the printer of the present disclosure, a pair of the second conveying surfaces can be arranged in positions lower than the pair of first conveying surfaces. In this way, it is possible to reduce the adhesion of abrasive powder, which is generated when the conveying device is transported by the second conveying surface, to the first conveying surface that transports the screen mask.

[0036] In the printer of the present disclosure, the conveying device can be provided with a cam plunger configured to roll on the second conveying surfaces, and the pair of first conveying surfaces can be arranged in a state where the cam plunger is in contact with the second conveying surfaces at positions lower than a bottom surface of a frame of the conveying device. This enables smooth conveying of the conveying device.

[0037] In the printer of the present disclosure, a pair of the second conveying surfaces can be arranged such that they are continuous with the inner surfaces of the pair of first conveying surfaces, and side walls can be arranged at the end sections of the pair of second conveying surfaces on the sides where the second conveying surfaces face each other. In this way, it is possible to reduce the falling of abrasive powder that is generated when the conveying device is transported through the second conveying surfaces.

[0038] The present description also discloses a technical idea wherein “the printer according to one of claims 1 to 4” in claim 6, as originally filed, is amended to “the printer according to one of claims 1 to 5”, and a technical idea wherein “the printer according to one of claims 1 to 4” in claim 7, as originally filed, is amended to “the printer according to one of claims 1 to 6”. Industrial applicability

[0039] The present disclosure is applicable to the printing industry and similar fields. Reference character list

[0040] 10: Printer, 11: Printer main body, 12: Housing, 20: Head assembly, 21: Head main body, 22: Squeegee, 23: Squeegee lifting and lowering section, 24: Slide, 25: Slide lifting and lowering section, 26: Head movement section, 27: Y-axis slider, 28: Guide rail, 30: Plate conveyor, 31: Plate conveyor section, 32: Plate support element, 33: Plate support element lifting and lowering section, 35: Detection section, 36: Through-hole, 37: Detection sensor, 40: Conveyor rail, 41: First conveying surface, 42: Conveyor surface main body, 43: Support section, 44: Recessed groove, 45: Second conveying surface, 46: Side wall, 50: Exchange device, 51a: Left unit 51b: right unit, 52: frame support element, 53: frame lifting and lowering section, 54: frame forward-backward movement section, 60: receiving frame, 61: support rail, 62, 63: opening, 70, 80: replacement frame, 81: outer frame, 81a: left side panel, 81b: right side panel, 82: support part, 83: cam plunger, M: screen mask, S: plate. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2018 / 105016 [0003, 0025, 0031]

Claims

[1] A printer for printing a target object with a viscous fluid using a screen mask and for conveying and exchanging several types of exchange devices including the screen mask, wherein the printer comprises: a pair of first conveying surfaces extending in a horizontal direction, wherein the pair of first conveying surfaces is configured to be used to convey the screen mask; and a second conveying surface extending parallel to a direction of extension of the pair of first conveying surfaces, wherein the second conveying surface is configured to be used to convey a conveying device to which another exchange device, different from the screen mask, is attached. [2] The printer according to claim 1, wherein the pair of first conveying surfaces has steps and a pair of second conveying surfaces does not have a step. [3] The printer according to claim 2, wherein the pair of first conveying surfaces comprises conveying surface main bodies and support sections which project as steps in positions higher than the conveying surface main bodies and which are configured to support the screen mask in a horizontal position. [4] The printer according to claim 3, wherein the first conveying surface has a recessed section which is recessed by the conveying surface main body around the support section. [5] The printer according to any one of claims 1 to 4, wherein a pair of the second conveying surfaces is arranged at lower positions than the pair of first conveying surfaces. [6] The printer according to any one of claims 1 to 4, wherein the conveying device is equipped with a cam plunger configured to roll on the second conveying surface, and the pair of first conveying surfaces is arranged at positions that are lower than a bottom surface of a frame of the conveying device in a state in which the cam plunger is in contact with the second conveying surface. [7] The printer according to any one of claims 1 to 4, wherein a pair of the second conveying surfaces is arranged such that they are connected to the inner sides of the pair of first conveying surfaces, and Side walls are arranged at the end sections of the pair of second conveying surfaces on the sides where the second conveying surfaces are opposite each other.

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