Printing device

Abstract

Provided is a printing device capable of suppressing peeling failure of a label and smoothly conveying the label. A rib portion (46) continuously has, from an upstream side of a lower side in a vertical direction toward a downstream side of an upper side in the vertical direction, a first rib (47) having a first surface (47a), a second rib (48) having a second surface (48a), and a third rib (49) having a third surface (49a). The first surface (47a) of the first rib (47) is inclined in a direction that moves away from a first imaginary straight line (L1) (refer to an end surface shape of FIG. 5) that links an outer peripheral surface of a peeling portion (52) and the second surface (48a) of the second rib (48) as further going to an upstream side in the vertical direction from an end portion of the second surface (48a) of the second rib (48) on the upstream side in the vertical direction. The third surface (49a) of the third rib (49) is inclined in a direction that moves away from the first imaginary straight line as further going to a downstream side in the vertical direction from an end portion of the second surface (48a) of the second rib (48) on the downstream side in the vertical direction.

Description

TECHNICAL FIELD

[0001] The present application relates to a printing apparatus, and particularly relates to a printing apparatus capable of performing a peeling process on a printed medium. BACKGROUND

[0002] Conventionally, a printing apparatus that performs a printing process on a printed medium in which a plurality of labels having an adhesive layer are discretely attached to a long strip-shaped backing paper is known.

[0003] Here, the label constituting the printed medium after the printing process is peeled from the backing paper by a peeling unit. At this time, since the label has the adhesive layer, it is desirable to suppress the label from being attached to the peeling unit.

[0004] Therefore, a technology that prevents a label after being discharged from a label discharge port from being tightly attached to a peeling base so as to be difficult to be removed by providing a rib to the peeling base is also known (for example, refer to Patent Literature 1).

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Laid-Open No. 2007-008061 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, in a case where the adhesive force of the adhesive layer of the label is strong, a conveyance failure in which the label does not smoothly peel from the backing paper and is attached to the peeling base or the like can occur.

[0010] An object of the present application is to provide a printing apparatus capable of suppressing a peeling failure of a label and smoothly conveying the label.

[0011] MEANS FOR SOLVING THE PROBLEMS

[0012] To achieve the above object, the present application is a printing device that prints a printed medium on which a plurality of labels having an adhesive layer are discretely attached to a long strip-shaped backing paper, including: a platen roller rotatably supported by a platen roller holder and transporting the printed medium in a first transport direction; a peeling member disposed on a downstream side of the first transport direction from the platen roller and peeling the labels from the backing paper by bending the backing paper in a second transport direction different from the first transport direction; a driven roller that sandwiches the backing paper bent by the peeling member between the driven roller and the platen roller and transports the backing paper in the second transport direction; a support member disposed on a downstream side of the first transport direction from the peeling member and rotatably supporting the driven roller; and a rib portion that guides the labels peeled from the backing paper in the first transport direction and is provided to the support member in a manner extending in the first transport direction, the rib portion continuously includes a first rib having a first surface, a second rib having a second surface, and a third rib having a third surface from an upstream side of the first transport direction toward a downstream side, the first surface of the first rib is inclined in a direction away from a first imaginary straight line connecting an outer peripheral surface of the peeling member and the second surface of the second rib as an end portion on an upstream side of the first transport direction from the second surface of the second rib goes further to an upstream side of the first transport direction, and the third surface of the third rib is inclined in a direction away from the first imaginary straight line as an end portion on a downstream side of the first transport direction from the second surface of the second rib goes further to a downstream side of the first transport direction.

[0013] In the present application, a plurality of labels are discretely attached to a long strip-shaped backing paper in a printed medium. The labels are peeled from the backing paper by transporting the printed medium by a platen roller and bending the backing paper by an outer peripheral surface of a peeling member. The backing paper after the labels are peeled is transported by being sandwiched between the platen roller and a driven roller.

[0014] A rib portion that guides the labels peeled from the backing paper is provided to a support member. The rib portion sequentially and continuously has a first rib, a second rib, and a third rib from an upstream side of a transport direction toward a downstream side. When a first imaginary straight line connecting an outer peripheral surface of the peeling member and a second surface of the second rib is assumed, a first surface of the first rib is inclined in a direction away from the first imaginary straight line as an end portion on an upstream side of the first transport direction from the second surface of the second rib goes further to an upstream side. A third surface of the third rib is inclined in a direction away from the first imaginary straight line as an end portion on a downstream side of the first transport direction from the second surface of the second rib goes further to a downstream side.

[0015] As a result of the positional relationship of the first rib, the second rib, and the third rib described above, the labels peeled from the backing paper take the following transport behavior.

[0016] In the case of a label in which the adhesive force of the adhesive layer with respect to the backing paper is strong, the end portion on the downstream side in the conveying direction of the adhesive layer of the label after being peeled from the backing paper is conveyed to the downstream side in the conveying direction while being in contact with the first surface of the first rib. If the end portion on the downstream side in the conveying direction of the adhesive layer of the label reaches the second surface of the second rib, the adhesive layer of the label becomes in a state in which it is not in contact with the first surface of the first rib. Thereafter, the label advances to the downstream side in the conveying direction while maintaining a state in which the adhesive layer is in contact with the second surface of the second rib and the adhesive layer is not in contact with the third surface of the third rib. However, in the case of a label in which the tendency to bend (so-called curling) is particularly strong, exceptionally, the end portion on the downstream side in the conveying direction of the adhesive layer of the label after being peeled from the backing paper is sometimes conveyed to the conveying direction while being in contact with the third surface of the third rib.

[0017] In the case of a label in which the adhesive force of the adhesive layer with respect to the backing paper is weak, the end portion on the downstream side in the conveying direction of the adhesive layer of the label after being peeled from the backing paper does not come into contact with the first surface of the first rib and reaches the second surface of the second rib. Thereafter, the label advances to the downstream side in the conveying direction while maintaining a state in which the adhesive layer is in contact with the second surface of the second rib and the adhesive layer is not in contact with the third surface of the third rib. However, in the case of a label in which the rigidity is large, the end portion on the downstream side in the conveying direction of the adhesive layer of the label is sometimes conveyed without coming into contact with the second surface of the second rib. In the case in which the tendency to bend is particularly strong, as with the above, exceptionally, the end portion on the downstream side in the conveying direction of the adhesive layer of the label is sometimes conveyed to the conveying direction while being in contact with the third surface of the third rib.

[0018] Effects of Invention

[0019] According to the present application, regardless of the strength of the adhesive force of the adhesive layer of the label, peeling failure of the label can be suppressed and the label can be smoothly conveyed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is an appearance perspective view of a printing device.

[0021] Figure 2 is a longitudinal sectional view of a central portion of a printing device.

[0022] Figure 3 is an enlarged longitudinal sectional view of a main portion of a printing device.

[0023] Figure 4 is a perspective view of an upper unit in a peeling unit.

[0024] Figure 5 is an explanatory view of the relationship between the rib shape of a peeling unit and a sensor. DETAILED DESCRIPTION

[0025] Next, a printing device of an embodiment of the present application will be described with reference to the drawings. Note that in the following description, as shown in the drawings, each direction of front, back, left, right, up and down is defined in a state where the printing device 1 is placed on a table. Figure 1

[0026] In the present embodiment, the printing device 1 is provided with a lower case 10 as a main body, an upper front cover 11 and an upper rear cover 12, and a substantially rectangular cuboid-shaped housing 2 is formed by them. Figure 1

[0027] The lower case 10 is provided with an operation panel section 3 in which various operation switches are arranged on a front surface thereof, and hook sections 4 in which both ends of a carrying strap (not shown) are engaged are provided on left and right corner sections from the front surface to the side surface of the lower case 10.

[0028] Note that although illustration is omitted, various connection sections such as a USB port, an RS-232C connector and the like are provided in the lower case 10 as a communication unit, and connection with a print data input terminal (for example, a personal computer, a bar code reader and the like) and the like can be performed in addition to power supply. In addition, various functions of wired LAN, wireless LAN, Bluetooth (registered trademark) are mounted in addition to the above-described communication unit, and label issuance including variable data (text, bar code) can be performed by transmitting text data to the printing device 1 using only these various communication units.

[0029] In addition, in label issuance, labels used in various scenes such as a transport ticket label, a baggage tag label for manufacturing / logistics, a food display label, a price tag for retail, a specimen label, a medicine manual label for medical care and the like can be included. At this time, the printed medium used in the present embodiment uses a medium in which a plurality of labels having an adhesive layer are discretely attached to a long strip-shaped backing paper.

[0030] As shown in the drawings, inside the printing device 1, a battery 5 of a charging type, electronic components related to driving and control such as a circuit substrate 6, a detection section 13 including an optical sensor that detects the presence or absence of a label, a front side tear-off strip 14 of a mountain shape that is continuous in the left-right direction, a discharge port 15 (refer to FIG. 2) arranged between a rear end section of the upper front cover 11 and a front end section of the upper rear cover 12, a print head 16 and a platen roller 17 that perform a prescribed printing process are arranged in a manner that they are positioned below the upper front cover 11. Figure 2 Figure 1 Note that the print head 16 and the platen roller 17 face each other.

[0031] The upper unit 40 of the peeling unit 30 is detachably provided to the upper front cover 11 by a pair of screws 19 in the left-right direction.

[0032] ​​​Below the upper rear cover 12, a roll 20 of printed media is replaced and housed. In the printed media, multiple labels L with adhesive layers are discretely affixed to strips of backing paper P. The upper rear cover 12 functions as an open / closed cover that can swing to a closed position covering the upper part of the roll 20 and an open position that allows the roll 20 to be removed, and is supported by the rear end of the lower housing 10 as a pivot point for rotation.

[0033] In addition, the rear end of the upper front cover 11 and the front end of the upper rear cover 12 are separated, and an outlet 15 is provided in the separated part for the printed media to be discharged according to the label issuance type mentioned above.

[0034] On the other hand, the lower unit 50 of the peeling unit 30 is provided on the upper rear cover 12 in a detachable manner via screws (not shown in the figure).

[0035] It should be noted that, as Figure 3 As shown, the discharge port 15 consists of a front discharge port 15a for the label L after being peeled off from the backing paper P and a rear discharge port 15b for the backing paper P. Here, the upper rear cover 12 is provided with an inclined surface 12a that is inclined in a front-low and rear-high manner, which is used as the bottom surface of the backing paper discharge port 15b, to facilitate the installation of the lower unit 50 and to guide the backing paper P when discharging the backing paper P.

[0036] As described above, the peeling unit 30 for peeling the label L from the backing paper P has an upper unit 40 that is mounted to the upper front cover 11 via screws 19 and a lower unit 50 that is mounted to the upper rear cover 12 via screws (not shown).

[0037] like Figure 4 As shown, the upper unit 40 includes a pair of left and right bracket portions 41, a platform portion 42 disposed between the front ends of the bracket portions 41, a driven roller 18 spanning between the rear ends of the bracket portions 41, a roller retainer portion 43 serving as a support member that pivotally supports both ends of the driven roller 18, and a guide portion 44 formed on the front surface side of the roller retainer portion 43.

[0038] The bracket portion 41 is supported on the platform portion 42 by the shaft portion 41a in a swingable manner.

[0039] The driven roller 18 rotates passively by abutting against the impression roller 17 at its upper rear portion, thereby pinching and transporting the liner paper P.

[0040] The roller retainer 43 supports the driven roller 18 in a rotatable manner by covering the upper part of the driven roller 18, and separates the outlet 15 into the outlet 15a of the label L and the outlet 15b of the backing paper P.

[0041] The guide portion 44 integrally has a guide surface portion 45 that is a set surface bent and curved in a manner that a lower direction intermediate portion in the up-and-down direction is located at the frontmost position to become a ridge line extending in the left-and-right direction, and a plurality of rib portions 46 provided at a prescribed interval at a plurality of places in the left-and-right direction from the guide surface portion 45 protruding to the front side.

[0042] The lower unit 50 has a pair of left and right bracket portions 51, a peeling portion 52 that is a peeling member that bends the backing paper P to separate from the label L, and a platen roller 17 that is disposed below the peeling portion 52 and is pivotally supported by the bracket portion 51 that is a platen roller holder.

[0043] The front end side of the peeling portion 52 is a cross-sectional R shape, and the peeling portion 52 bends the backing paper P. The bent backing paper P is sandwiched between the platen roller 17 and the driven roller 18 and is conveyed. The label L attached to the backing paper P is not bent even if the backing paper P is bent due to the rigidity of the label L itself, and thus is peeled from the backing paper P. In this way, the peeling portion 52 gradually peels the printed label L from the backing paper P by conveying the bent backing paper P.

[0044] In this way, the printing device 1 that prints the printed medium (roll 20) in which a plurality of labels L having an adhesive layer are discretely attached to a long strip-shaped backing paper P has: a platen roller 17 that is rotatably supported by the bracket portion 51 and conveys the printed medium toward the upper side in the up-and-down direction; a peeling portion 52 that is disposed at a position downstream of the platen roller 17 in the up-and-down direction, and peels the label L from the backing paper P by bending the backing paper P toward the rear side in the front-and-rear direction; a driven roller 18 that sandwiches the backing paper P bent by the peeling portion 52 between the driven roller 18 and the platen roller 17 and conveys the backing paper P toward the rear side in the front-and-rear direction; a roller holder portion 43 that is disposed at a position downstream of the peeling portion 52 in the up-and-down direction and rotatably supports the driven roller 18; and a rib portion 46 that extends in the up-and-down direction in a manner that guides the label L peeled from the backing paper P toward the upper side in the up-and-down direction on the front surface side of the roller holder portion 43.

[0045] The roller holder portion 43 integrally has a guide surface portion 45 that is a set surface extending substantially parallel to the length direction of the platen roller 17, and the rib portion 46 is provided at a plurality of (six in total in this embodiment) prescribed intervals in the guide surface portion 45. Figure 4

[0046] In this way, in the roller holder portion 43 provided to extend in the axis R direction of the platen roller 17, the rib portion 46 is provided at prescribed intervals along the axis R direction, and the guiding function of the rib portion 46 can be exerted without omission in the width direction of the printed medium.

[0047] At this time, the label L can also cope with simultaneous printing of two places (two sheets) on the left and right, for example.

[0048] As​Figure 5 As shown, the rib 46 is provided with a first rib 47 having a first surface 47a, a second rib 48 having a second surface 48a, and a third rib 49 having a third surface 49a, continuously extending from the upstream side of the lower side in the vertical direction to the downstream side of the upper side in the vertical direction.

[0049] In addition, in the first rib 47, the rear rib 47b, which is downstream of the discharge direction of the liner paper P, the middle rib 47c, which is upstream of the discharge direction of the liner paper P, and the front rib 47d, which is upstream of the discharge direction of the label L, are continuously formed by bending.

[0050] Furthermore, the central rib 47c faces the peeling portion 52 with a predetermined gap S. Here, the gap S has a size (height) that allows the backing paper P, after being bent by the peeling portion 52, to pass through.

[0051] Therefore, the specified gap S can be positioned between the upstream end of the first rib 47 in the transport direction and the peeling part 52, allowing the liner paper P, after being bent by the peeling part 52, to pass smoothly. It should be noted that by swinging the upper unit 40, the gap S can be further widened. For example, the liner paper P before the start of printing can also be easily clamped between the impression roller 17 and the driven roller 18 via the peeling part 52 by the user's manual operation.

[0052] A first imaginary straight line L1 (referencing) is envisioned, connecting the outer peripheral surface of the peeling portion 52 and the second surface 48a of the second rib 48. Figure 5 When considering the end face shape, the first surface 47a of the first rib 47 is inclined more and more from the end of the second surface 48a of the second rib 48 in the vertical direction upstream of the end of the second surface 48a in the vertical direction, away from the first imaginary straight line L1 of the second surface 48a of the connecting peeling part 52. The third surface 49a of the third rib 49 is inclined more and more from the end of the second surface 48a of the second rib 48 in the vertical direction downstream of the end of the second surface 48a in the vertical direction, away from the first imaginary straight line L1.

[0053] It should be noted that the term "surface" here includes, for example, Figure 5 In addition to the case where the protruding end faces of each rib 47, 48, 49 are trapezoidal in cross-sectional shape as shown in (B), the case also includes, for example, Figure 5 As shown in (C), the edges are set as the first surface 47a, the second surface 48a, and the third surface 49a when the cross-sectional shape of each rib 47, 48, and 49 is semi-elliptical.

[0054] Thus, in the printed medium, the long strip-shaped backing paper P has a plurality of labels L discretely adhered thereto. The labels L are peeled from the backing paper P by the printed medium being conveyed by the impression roller 17 and the backing paper P being bent by the outer peripheral surface of the peeling portion 52.

[0055] The backing paper P from which the labels L have been peeled is conveyed while being sandwiched between the impression roller 17 and the driven roller 18. The driven roller 18 is disposed in a manner so as to be along the axis of the impression roller 17. The driven roller 18 is rotatably supported by the roller holder portion 43 which is disposed so as to extend along the axis.

[0056] The rib portion 46 which guides the labels L from which the backing paper P has been peeled is provided to the guide surface portion 45 of the roller holder portion 43. The rib portion 46 successively has a first rib 47, a second rib 48, and a third rib 49 in that order from the upstream side toward the downstream side in the conveying direction.

[0057] As a result of the positional relationship of the first rib 47, the second rib 48, and the third rib 49 as described above, the labels L from which the backing paper P has been peeled take the following conveying behavior.

[0058] In the case of the labels L in which the adhesion of the adhesive layer with respect to the backing paper P is relatively strong, the end portion on the downstream side in the conveying direction of the adhesive layer of the labels L from which the backing paper P has been peeled is conveyed while being in contact with the first surface 47a of the first rib 47. If the end portion on the downstream side in the conveying direction of the adhesive layer of the labels L reaches the second surface 48a of the second rib 48, the adhesive layer of the labels L becomes in a state in which it is not in contact with the first surface 47a of the first rib 47.

[0059] Thereafter, the labels L advance toward the downstream side in the conveying direction while maintaining a state in which the adhesive layer is in contact with the second surface 48a of the second rib 48 and the adhesive layer is not in contact with the third surface 49a of the third rib 49. However, in the case of the labels L in which the tendency to bend (so-called curling) is particularly strong, exceptionally, the end portion on the downstream side in the conveying direction of the adhesive layer of the labels L from which the backing paper P has been peeled is sometimes conveyed while being in contact with the third surface 49a of the third rib 49.

[0060] In the case of the labels L in which the adhesion of the adhesive layer with respect to the backing paper P is relatively weak, the end portion on the downstream side in the conveying direction of the adhesive layer of the labels L from which the backing paper P has been peeled reaches the second surface 48a of the second rib 48 without being in contact with the first surface 47a of the first rib 47. Thereafter, the labels L advance toward the downstream side in the conveying direction while maintaining a state in which the adhesive layer is in contact with the second surface 48a of the second rib 48 and the adhesive layer is not in contact with the third surface 49a of the third rib 49.

[0061] However, in the case where the rigidity of the label L is relatively large, the downstream end of the adhesive layer of the label L is sometimes transported without contacting the second surface 48a of the second rib 48. In the case where the tendency to bend is particularly strong, as in the above, the downstream end of the adhesive layer of the label L is sometimes transported while contacting the third surface 49a of the third rib 49.

[0062] Thus, regardless of the strength of the adhesive force of the adhesive layer, the adhesive layer of the label L is substantially transported in a state of not contacting the third surface 49a of the third rib 49. Thereby, the load at the time of transporting the label L can be reduced, and thus the label L can be smoothly transported.

[0063] Note that the peeling unit 30 can use a printed medium (roll 20) in which a plurality of labels L are discretely attached to a long sheet of backing paper P, peel (strip) the labels L from the backing paper P, and discharge the backing paper P and the labels L in a separated state to the discharge port 15.

[0064] The detection unit 13 is provided to the front-side mounting portion to non- contactedly detect the presence or absence of the label L peeled from the backing paper P by the peeling unit 30 mounted to the rear-side mounting portion 25 and discharged from the discharge port 15.

[0065] Specifically, the detection unit 13 disposed facing the guide surface portion 46 detects the label L by emitting sensor light and receiving the sensor light reflected by the label L peeled at least partially from the backing paper P and guided by the rib portion 46.

[0066] At this time, the detection unit 13 is disposed at any one of a first position at which the optical axis Q of the sensor light intersects a second imaginary straight line connecting the plurality of rib portions 46 in the direction of the axis R of the impression roller 17 (see FIG. 6) and a second position at which one rib portion 46 is located on the optical axis Q of the sensor light. Figure 5 In particular, it is preferable that the detection unit 13 be disposed at a position at which the optical axis Q of the sensor light intersects a second imaginary straight line connecting the second surface 48a of the second rib 48 in the direction of the axis R of the impression roller 17 or at a position at which the second surface 48a of one second rib 48 is on the optical axis Q of the sensor light.

[0067] As described above, the label L is peeled by the backing paper P being bent by the peeling portion 52, and the peeled label L is guided by the rib portion 46.

[0068] As a rule, the label L maintains a state in which the adhesive layer contacts the second surface 48a of the second rib 48 and the adhesive layer does not contact the third surface 49a of the third rib 49.

[0069] Further, the detection unit 13 emits sensor light to the label L that has become in a stable posture in such a state and performs detection.

[0070] Considering this environment, the detection unit 13 is disposed at either the first or the second location. When disposed at the first location, the optical axis Q of the emitted sensor light intersects with respect to a second imaginary straight line connecting the multiple ribs 46 (e.g., a line connecting the second ribs 48 along the axis R of the impression roller 17). Conversely, when disposed at the second location, one rib 46 is located on the optical axis Q of the sensor light. Furthermore, in either case, the distance from the detection unit 13 to the rib 46 can be defined as short and stable as possible, thus improving the detection accuracy relative to the label L peeled from the backing paper P and guided by the rib 46.

[0071] Furthermore, after creating label L using the desired print data, the user can paste the label L, which is discharged from outlet 15a, onto the desired object to be pasted.

[0072] The above is with reference to the appendix. Figure 1 The embodiments of the present invention have been described in detail. However, the scope of the technical concept of the present invention is not limited to the embodiments described herein. Obviously, those skilled in the art to which this invention pertains will be able to conceive of various modifications, alterations, combinations, etc., within the scope of the technical concept of the present invention as set forth in the claims. Therefore, the technologies resulting from these modifications, alterations, combinations, etc., also naturally fall within the scope of the technical concept of the present invention.

[0073] In addition to the methods described above, the above-described embodiments and variations can also be appropriately combined and utilized.

[0074] In addition, although not all examples are given, the present invention can be implemented with various modifications without departing from its spirit.

[0075] Label Explanation

[0076] 1. Printing device

[0077] 10 Lower housing

[0078] 11. Front cover

[0079] 12. Back Cover

[0080] 13. Detection Department (Optical Sensors)

[0081] 14. Front tear strip

[0082] 15 discharge outlets

[0083] 16 pressure plates

[0084] 17 Impression Rollers

[0085] 18 Driven Rollers

[0086] 19 screw

[0087] 20 roll

[0088] 30 peeling unit

[0089] 40 upper unit

[0090] 41 bracket portion

[0091] 41a shaft portion

[0092] 42 table portion

[0093] 43 roller holder portion (support member)

[0094] 44 guide portion

[0095] 45 guide surface portion (setting surface)

[0096] 46 rib portion

[0097] 47 ridge line portion

[0098] 48 backing paper guide surface portion

[0099] 49 label guide surface portion

[0100] 50 lower unit

[0101] 51 bracket portion (platen roller holder)

[0102] 52 peeling portion (peeling member)

[0103] L label

[0104] P backing paper

[0105] Q optical axis

[0106] R axis center

Claims

1. A printing apparatus which performs printing on a printed medium in which a plurality of labels each having an adhesive layer are discretely attached to a long strip-shaped backing paper, characterized by comprising: a label peeling unit which peels the labels from the backing paper; a label conveying unit which conveys the labels peeled by the label peeling unit; a label positioning unit which positions the labels conveyed by the label conveying unit; and a printing unit which performs printing on the labels positioned by the label positioning unit. Possessing: a platen roller rotatably supported by a platen roller holder, which conveys the printed medium in a first conveying direction; a peeling member disposed on a downstream side of the platen roller in the first conveying direction, which peels the label from the backing sheet by bending the backing sheet in a second conveying direction different from the first conveying direction; a driven roller, which conveys the backing sheet bent by the peeling member in the second conveying direction by sandwiching the backing sheet between the driven roller and the platen roller; a support member disposed on a downstream side of the peeling member in the first conveying direction, which rotatably supports the driven roller; and a rib portion, which guides the label peeled from the backing sheet in the first conveying direction, is provided on the support member in a manner extending in the first conveying direction, the rib portion continuously possesses a first rib having a first surface, a second rib having a second surface, and a third rib having a third surface from an upstream side to a downstream side of the first conveying direction, the first surface of the first rib is inclined in a direction away from a first imaginary straight line connecting an outer peripheral surface of the peeling member and the second surface of the second rib as an end portion thereof further goes to an upstream side of the first conveying direction from an upstream side of the second surface of the second rib, the third surface of the third rib is inclined in a direction away from the first imaginary straight line as an end portion thereof further goes to a downstream side of the first conveying direction from a downstream side of the second surface of the second rib, the printing device further possesses an optical sensor disposed facing the support member and emitting sensor light, which detects the label peeled at least partially from the backing sheet and guided by the second rib, the optical sensor is disposed at a first position where an optical axis of the sensor light intersects a second imaginary straight line connecting a plurality of the second ribs in a direction parallel to a length direction of the platen roller.

2. The printing device according to claim 1, wherein an end portion of the first rib on an upstream side of the first conveying direction faces the peeling member across a prescribed gap, the gap has a size through which the backing sheet bent by the peeling member can pass.

3. The printing device according to claim 1 or 2, wherein the support member has a placement surface extending substantially in parallel with the length direction of the platen roller, and a plurality of the rib portions are disposed at prescribed intervals on the placement surface.

4. The printing device according to claim 3, further possessing an optical sensor disposed facing the support member and emitting sensor light, which detects the label peeled at least partially from the backing sheet and guided by the rib portion, the optical sensor is disposed at a first position where an optical axis of the sensor light intersects a second imaginary straight line connecting the plurality of rib portions or a second position where one of the rib portions is on the optical axis of the sensor light.

5. The printing device according to claim 1, wherein ​ ​ The support member has a placement surface extending substantially in parallel with a length direction of the impression roller, The ribs are provided at a prescribed interval on the placement surface in a direction parallel with the length direction of the impression roller.

6. The printing device according to claim 5, wherein The optical sensor is disposed at a second position facing at least one of the second ribs.

7. The printing device of claim 1, wherein, The second ribs are smaller in size than the first ribs.

8. The printing device according to claim 1, wherein The second ribs are smaller in size than the third ribs.

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