Printing device

Abstract

To provide a printing apparatus capable of preventing a lever shape in contact with a recording medium from getting complicated and large-sized.SOLUTION: A printing apparatus has a guide face guiding a recording medium, a conveying part capable of conveying the recording medium in a first direction and a second direction opposite to the first direction along the guide face, and a detection part detecting the recording medium. The detection part has a first lever which is positioned at an advanced position advancing from the guide face when not in contact with the recording medium, retreats from the advanced position by rotating in the first rotation direction when coming in contact with the recording medium conveyed in the first direction, and retreats from the advanced position by rotating in the second rotation direction opposite to the first direction when coming in contact with the recording medium conveyed in the second direction, a second lever which rotates according to the rotation of the first lever in the first rotational direction or the second rotational direction, and a detector detecting the rotation of the second lever.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a printing device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, as disclosed in Patent Document 1, a printing device is known that detects a recording medium by using a cantilevered lever that comes into contact with the recording medium. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-9915 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the printing device described above, the lever that comes into contact with the recording medium may have a complex shape and may be large. [Means for solving the problem]

[0005] The printing device includes a guide surface that guides a recording medium, a transport unit capable of transporting the recording medium along the guide surface in a first direction and in a second direction opposite to the first direction, and a detection unit that detects the recording medium, the detection unit having a first lever that is in an advanced position advanced from the guide surface when not in contact with the recording medium, rotates in a first rotational direction and retreats from the advanced position when in contact with the recording medium transported in the first direction, and rotates in a second rotational direction that is opposite to the first rotational direction and retreats from the advanced position when in contact with the recording medium transported in the second direction, a second lever that rotates in conjunction with the rotation of the first lever in the first rotational direction or the second rotational direction, and a detector that detects the rotation of the second lever. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing the appearance of a printing apparatus according to an embodiment. [Diagram 2] FIG. 1 is a cross-sectional view showing a cross section of a main part of a printing device according to an embodiment. [Diagram 3] FIG. 3 is an enlarged perspective view of the lower part of the main part of FIG. 2. [Figure 4] FIG. 2 is a perspective view showing a detection unit according to an embodiment. [Diagram 5] FIG. 4 is a perspective view showing a first lever of a detection unit according to an embodiment. [Figure 6] FIG. 4 is a cross-sectional view showing the detection unit when a recording medium is not detected. [Figure 7] 4 is a cross-sectional view showing the detection unit when detecting a recording medium transported in a first direction. FIG. [Figure 8] 6 is a cross-sectional view showing the detection unit when detecting a recording medium transported in a second direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] 1. Embodiment A printing device 10 according to an embodiment will be described below with reference to the drawings. The directions in the drawings will be explained using a three-dimensional coordinate system. For convenience of explanation, the positive direction of the Z axis will be referred to as the upward direction, the upper side, or simply the upper side, the negative direction will be referred to as the downward direction, the lower side, or simply the lower side, the positive direction of the X axis will be referred to as the right direction, the right side, or simply the right, the negative direction will be referred to as the left direction, the left side, or simply the left, the positive direction of the Y axis will be referred to as the rearward direction, the rear side, or simply the rear, and the negative direction will be referred to as the frontward direction, the front side, or simply the front.

[0008] 1-1. Printer configuration 1 is capable of printing on sheet-like recording media such as paper or film cut to a predetermined length (hereinafter simply referred to as paper) P, or on recording media such as folded fanfold paper (hereinafter simply referred to as continuous paper) F. The paper P may be, for example, a bankbook, a postcard, an envelope, etc. As shown in FIG. 1, a printing device 10 is covered with a case 11 and an openable / closable cover 12. A user stands in front of the printing device 10 to work. The user holds a sheet of paper P and manually inserts it in direction A, which is a first direction and a rear direction, along a front guide surface 13, which is a guide surface. The inserted sheet of paper P is transported in direction A and printed on. After printing, the sheet of paper P is returned in direction B, which is a second direction and a forward direction, and ejected toward the user. Direction B is the opposite direction to direction A.

[0009] The configuration of the printing device 10 will be described in detail with reference to Figure 2. The printing device 10 is, for example, a dot impact printer.

[0010] The head 20 is positioned opposite the platen roller 23 and prints on the paper P between the head 20 and the platen roller 23. The head 20 is a dot impact type head that projects pins through the ink ribbon toward the paper P and prints by transferring the ink on the ink ribbon to the paper P. The pins are also called wires.

[0011] The guide surfaces that guide the paper P and the continuous paper F include a front guide surface 13 and a rear guide surface 14. The transport section includes a front roller pair 21 and a rear roller pair 22. The front roller pair 21 and the rear roller pair 22 can transport the paper P and the continuous paper F in directions A and B along the front guide surface 13 and the rear guide surface 14.

[0012] The front roller pair 21, which is composed of a driven roller 21a and a driving roller 21b, is located in front of the head 20 and is capable of nipping the paper P and transporting it along the front guide surface 13. The driving roller 21b is driven by a motor. The rear roller pair 22, which is composed of a driven roller 22a and a driving roller 22b, is located behind the head 20 and is capable of nipping the paper P and transporting it along the rear guide surface 14. The driving roller 22b is driven by a motor. The front roller pair 21, the rear roller pair 22, and the platen roller 23 can transport the paper P and the continuous paper F in the A direction or the B direction along the front guide surface 13 and the rear guide surface 14 while interlocking with each other.

[0013] The tractor unit 15 transports the continuous paper F, which is set behind the printing device 10, in direction C. The continuous paper F transported in direction C is transported in direction B by the rear roller pair 22 along the rear guide surface 14. When the continuous paper F reaches the head 20, printing is performed on it, and it is transported in direction B by the front roller pair 21 along the front guide surface 13 and discharged towards the user.

[0014] 1-2.Detection section configuration As shown in FIGS. 2 and 3, the front detection unit 31 as a detection unit is located in the front direction of the head 20, and the rear detection unit 41 as a detection unit is located in the rear direction of the head 20. The front detection unit 31 is configured such that a first lever 31a, a second lever 31b, and a detector 31c are supported by a holder 31d. The holder 31d rotatably supports the first lever 31a and the second lever 31b. The rear detection unit 41 has the same configuration as the front detection unit 31, and is composed of a first lever 41a, a second lever 41b, a detector 41c, and a holder 41d, which are similarly shaped. The holder 41d rotatably supports the first lever 41a and the second lever 41b.

[0015] 2 and 3 show a paper-out state where there is no paper P on the front guide surface 13 and the rear guide surface 14. The first lever 31a of the front detection unit 31 is not in contact with the paper P and is in an advanced position where it advances upward from the front guide surface 13. At this time, the front detection unit 31 detects the paper-out state. Similarly, the first lever 41a of the rear detection unit 41 is not in contact with the paper P and is in an advanced position where it advances upward from the rear guide surface 14. At this time, the rear detection unit 41 detects the paper-out state.

[0016] The configuration of the front detection unit 31 will be described in detail with reference to Figures 4 and 5. Note that the rear detection unit 41 has the same configuration as the front detection unit 31, except for its arrangement, and therefore description thereof will be omitted. 4 and 5 show a paper-out state in which the first lever 31a is in the advanced position and is not in contact with the paper P. FIG. 4, the first lever 31a of the front detector 31 is supported by a holder 31d so as to be rotatable about a shaft 31a3, and the second lever 31b is supported by the holder 31d so as to be rotatable about a shaft 31b3.

[0017] The second lever 31b has a sliding surface 31b1 shown in Fig. 4. The first lever 31a has one end 31a1 and the other end 31a2. The one end 31a1 or the other end 31a2 of the first lever 31a is configured to be slidable on the sliding surface 31b1 of the second lever 31b.

[0018] When the first lever 31a comes into contact with the leading edge of the paper P being transported in the A direction from the state in which the first lever 31a is in the advanced position shown in Fig. 5, the first lever 31a rotates in the first rotation direction, that is, clockwise around the shaft 31a3, and moves back from the advanced position toward the front guide surface 13, and at the same time, the other end 31a2 also rotates clockwise. At this time, the other end 31a2 slides on the sliding surface 31b1 of the second lever 31b, and moves the sliding surface 31b1 so as to push it down in the CA direction. The position where the first lever 31a moves back from the advanced position toward the front guide surface 13 is referred to as the retreated position.

[0019] 5, when the first lever 31a comes into contact with the leading edge of the paper P transported in the direction B, the first lever 31a rotates counterclockwise about the shaft 31a3, which is the second rotation direction, and moves back from the advanced position to the retracted position, and at the same time, the one end 31a1 also rotates counterclockwise. At this time, the one end 31a1 slides on the sliding surface 31b1 of the second lever 31b, and moves the sliding surface 31b1 so as to push it down in the direction CB.

[0020] Whether the first lever 31a comes into contact with paper P transported in direction A and rotates clockwise, or whether the first lever 31a comes into contact with paper P transported in direction B and rotates counterclockwise, the first lever 31a slides against the sliding surface 31b1 of the second lever 31b and moves the sliding surface 31b1 so as to press down in the same direction. Regardless of the rotation direction of the first lever 31a, the second lever 31b rotates in the same direction, that is, counterclockwise, about the shaft 31b3 as a result of the sliding surface 31b1 being pressed down in the same direction by the first lever 31a and moving.

[0021] In this way, when the first lever 31a rotates in either direction due to the paper P transported in direction A or the paper P transported in direction B, the sliding surface 31b1 of the second lever 31b is pushed down while being slid by the first lever 31a in accordance with the rotation of the first lever 31a, and the second lever 31b moves in the same direction. As a result, the second lever 31b rotates in the same counterclockwise direction regardless of the rotation direction of the first lever 31a. In addition, it is preferable that the shapes of the parts of the first lever 31a that come into contact with the paper P transported in the A direction and the B direction are symmetrical with respect to the transport direction. The first lever 31a has a simple structure and can be small. Also, the friction load is the same for paper transported in either direction.

[0022] It is preferable that the sliding surface 31b1 of the second lever 31b and one end 31a1 and the other end 31a2 of the first lever 31a, which are parts that slide on the sliding surface 31b1, are made of different materials. Also, for example, it is preferable that they are made of resins with different sliding properties. For example, the sliding surface 31b1 of the second lever 31b is made of POM DURACON SW-01 (product name), and one end 31a1 and the other end 31a2 of the first lever 31a are made of POM DURACON NW-02 (product name). The reverse combination is also possible.

[0023] By constructing them from different materials in this manner, it is possible to reduce frictional load and wear between the sliding surface 31b1 of the second lever 31b and one end 31a1 and the other end 31a2 of the first lever 31a, which are the parts that slide against the sliding surface 31b1. Moreover, one end 31a1 and the other end 31a2 of the first lever 31a may be formed in a roller shape, which can reduce the friction load and wear between the sliding surface 31b1 and the sliding surface 31b1.

[0024] The detector 31c is a transmission type optical sensor. As shown in Fig. 4, when the first lever 31a is not in contact with the paper P, the detection light of the detector 31c is blocked by the end 31b2 of the second lever 31b, and the detector 31c is in a state where it does not detect the detection light. As described above, when the first lever 31a comes into contact with the paper P transported in the direction A or the paper P transported in the direction B, it rotates clockwise or counterclockwise, respectively, and moves from the advanced position to the retreated position. At this time, in accordance with the clockwise or counterclockwise rotation of the first lever 31a, the second lever 31b rotates in the same counterclockwise direction.

[0025] As the second lever 31b rotates, the end 31b2 moves away from the detector 31c, and the detector 31c changes to a paper-present state where it detects the detection light. In this way, the front detection unit 31 changes from a paper-absent state where it does not detect the detection light to a paper-present state where it detects the detection light, and can detect the paper P being transported in the A direction or B direction. In this way, when the first lever 31a is not in contact with the paper P, the front detection unit 31 can detect a paper-absent state in which the detector 31c does not detect detection light, and when the first lever 31a is in contact with the paper P, the front detection unit 31 can detect a paper-present state in which the detector 31c detects detection light.

[0026] As described above, Fig. 4 shows the state in which the first lever 31a is in the advanced position and not in contact with the paper P. The detector 31c detects this as a paper-out state. The first spring 31e, which is a first elastic member, is stretched between the first lever 31a and the holder 31d. The first spring 31e pulls the first lever 31a so as to hold it in the advanced position. When the first lever 31a comes into contact with the leading edge of the paper P transported in the A direction, it rotates clockwise against the pulling force of the first spring 31e and moves from the advanced position to the retracted position. The detector 31c detects this as a paper-present state.

[0027] The paper P is printed by the head 20 while being transported in direction A by the front roller pair 21 and the rear roller pair 22. As the paper P is further transported in direction A, the rear end of the paper P passes the position of the first lever 31a. When the first lever 31a is no longer in contact with the paper P, it rotates counterclockwise, which is the opposite direction to the clockwise direction, due to the pulling force of the first spring 31e, and moves from the retracted position back to the advanced position. The detector 31c detects this as a paper-out state.

[0028] When the rear end of the paper P passes the position of the first lever 31a and printing on the paper P is completed, the paper P is transported in the B direction by the front roller pair 21 and the rear roller pair 22 and returned. When the first lever 31a comes into contact with the rear end of the paper P transported in the direction B, it rotates counterclockwise against the pulling force of the first spring 31e and moves from the advanced position to the retracted position. The detector 31c detects the paper-present state.

[0029] As the paper P is further transported in the B direction by the front roller pair 21 and the rear roller pair 22, the leading edge of the paper P passes the position of the first lever 31a. When the first lever 31a is no longer in contact with the paper P, the pulling force of the first spring 31e causes it to rotate clockwise, which is the opposite direction to the counterclockwise direction, and it moves from the retracted position back to the advanced position. The detector 31c detects this as a paper-out state.

[0030] The second spring 31f, which is a second elastic member, is stretched between the second lever 31b and the holder 31d. The second spring 31f pulls the sliding surface 31b1 of the second lever 31b so as to push it up in the direction opposite to the CA and CB directions. The second spring 31f pulls the second lever 31b via the sliding surface 31b1 so that the first lever 31a moves toward the advanced position. In other words, the second spring 31f pulls the second lever 31b so as to hold the first lever 31a in the advanced position, similar to the first spring 31e.

[0031] When the first lever 31a comes into contact with the paper P being transported in the A direction or the B direction, it rotates clockwise or counterclockwise and moves from the advanced position to the retracted position. As the first lever 31a rotates clockwise or counterclockwise, the second lever 31b moves so that the sliding surface 31b1 slides against the first lever 31a and is pushed down, rotating counterclockwise against the pulling force of the second spring 31f that urges the first lever 31a toward the advanced position. The detector 31c detects the paper-present state because the movement of the end 31b2 of the second lever 31b allows detection light to pass through.

[0032] When the paper P is further transported in the A direction or the B direction by the front roller pair 21 and the rear roller pair 22, the rear end or the front end of the paper P passes the position of the first lever 31a. When the first lever 31a is no longer in contact with the paper P, the second lever 31b rotates clockwise, which is the opposite direction to the counterclockwise direction, due to the pulling force of the second spring 31f which moves the first lever 31a toward the advanced position. At this time, the second lever 31b moves in such a way that the sliding surface 31b1 pushes up while sliding against the first lever 31a, thereby moving the first lever 31a back from the retracted position to the advanced position. The detector 31c detects the paper-out state because the detection light is blocked by the end 31b2 of the second lever 31b.

[0033] The above has been described by taking as an example the configuration of the front detection unit 31. The rear detection unit 41 has the same configuration as the front detection unit 31, and the first lever 31a, the second lever 31b, the detector 31c, and the holder 31d in the front detection unit 31 correspond to the first lever 41a, the second lever 41b, the detector 41c, and the holder 41d in the rear detection unit 41, respectively.

[0034] 1-3. Operation of the detector The operation of the front detection unit 31 will be described in detail with reference to Figures 6 to 8. Note that the rear detection unit 41 only differs in arrangement from the front detection unit 31 and operates in the same manner as the front detection unit 31, so a description thereof will be omitted.

[0035] 6 shows a paper-out state where there is no paper P on the front guide surface 13. The first lever 31a of the front detection unit 31 is not in contact with the paper P and is in an advanced position where it advances upward from the front guide surface 13. The end 31b2 of the second lever 31b is in a position where it blocks the detection light of the detector 31c and is in a state where it does not detect the detection light. In this way, when there is no paper P on the front guide surface 13 and the first lever 31a is not in contact with the paper P, the front detection unit 31 can detect this as a paper-out state where the detector 31c does not detect the detection light.

[0036] The first spring 31e stretched between the first lever 31a and the holder 31d pulls the first lever 31a to hold it in the advanced position, and the second spring 31f stretched between the second lever 31b and the holder 31d pulls the second lever 31b via the sliding surface 31b1 to move the first lever 31a toward the advanced position. When the paper P is no longer on the front guide surface 13 and the first lever 31a is no longer in contact with the paper P, the first lever 31a can return from the retracted position to the advanced position due to the pulling forces of the first spring 31e and the second spring 31f.

[0037] When the paper P is transported in the A direction along the front guide surface 13, the front detection unit 31 transitions from the no-paper state shown in FIG. 6 to the paper-present state shown in FIG. As shown in Fig. 7, when the first lever 31a comes into contact with the leading edge of the paper P transported in the A direction and is pushed, it rotates clockwise around the shaft 31a3 against the pulling force of the first spring 31e, and moves from the advanced position to the retracted position. At the same time, the other end 31a2 of the first lever 31a also rotates clockwise around the shaft 31a3. While rotating, the other end 31a2 slides on the sliding surface 31b1 of the second lever 31b. While sliding on the sliding surface 31b1, the other end 31a2 moves so as to push down the sliding surface 31b1 of the second lever 31b in the CA direction.

[0038] By pushing down the sliding surface 31b1, the second lever 31b rotates counterclockwise around the shaft 31b3 against the pulling force of the second spring 31f. At the same time, the end 31b2 of the second lever 31b also rotates counterclockwise and moves away from the position blocking the detection light of the detector 31c. The detector 31c then changes to a paper-present state in which it detects the detection light. In this way, the front detection unit 31 transitions from a paper-absent state in which the detector 31c does not detect the detection light to a paper-present state in which it detects the detection light, and the front detection unit 31 can detect the paper P transported in the A direction.

[0039] The paper P detected by the front detection unit 31 is printed by the head 20 while being transported by the front roller pair 21 and the rear roller pair 22 . When the paper P reaches the position of the head 20, a predetermined printing is performed by the head 20. For example, the head 20 prints one line on the paper P while moving rightward or leftward, and then the front roller pair 21 and the rear roller pair 22 transport one line on the paper P. When printing multiple lines, the printing by the head 20 and the transporting operation of the paper P by the front roller pair 21 and the rear roller pair 22 are repeated.

[0040] As the paper P is further transported in direction A and the rear end of the paper P passes the position of the first lever 31a of the front detection unit 31, the front detection unit 31 transitions from the paper-present state shown in FIG. 7 to the paper-absent state shown in FIG. At this time, the paper P is no longer present at the position of the first lever 31a on the front guide surface 13, so the first lever 31a rotates counterclockwise around the shaft 31a3 due to the pulling force of the first spring 31e, and returns from the retracted position to the advanced position. At the same time, the other end 31a2 of the first lever 31a also rotates counterclockwise around the shaft 31a3.

[0041] By the counterclockwise rotation of the other end 31a2, the downward force in the CA direction applied to the sliding surface 31b1 of the second lever 31b is no longer applied. Therefore, the second lever 31b rotates clockwise around the shaft 31b3 due to the pulling force of the second spring 31f that pushes the sliding surface 31b1 up in the opposite direction to the CA direction. At the same time, the end 31b2 of the second lever 31b also rotates clockwise and moves to a position that blocks the detection light of the detector 31c. The detector 31c transitions to a paper-out state in which it does not detect the detection light.

[0042] In this way, the front detection unit 31 transitions from a paper-present state in which the detector 31c detects detection light to a paper-absent detection state in which no detection light is emitted, and can detect that the rear end of the paper P has passed the position of the first lever 31a. When the front detection unit 31 detects that the rear end of the paper P has passed the position of the first lever 31a, the paper P is transported back in direction B by the front roller pair 21 and the rear roller pair 22 and is discharged toward the user.

[0043] The front roller pair 21 and the rear roller pair 22 are capable of transporting the continuous paper F transported from direction C by the tractor unit 15 in direction B. The operation of the front detection unit 31 for the paper P and continuous paper F transported in direction B will be described. The operation of the front detection unit 31 for the paper P and the continuous paper F is similar, so the case of paper P will be described as an example.

[0044] When the paper P is transported back in direction B by the front roller pair 21 and the rear roller pair 22 from the paper-free state in Figure 6, which shows the state where the rear end of the paper P transported in direction A has passed the position of the first lever 31a, the front detection unit 31 transitions to the paper-present state shown in Figure 8. At this time, the first lever 31a comes into contact with the rear end of the paper P transported in the B direction and is pushed, and rotates counterclockwise around the shaft 31a3 against the pulling force of the first spring 31e, moving from the advanced position to the retracted position. At the same time, one end 31a1 of the first lever 31a also rotates counterclockwise around the shaft 31a3. While rotating counterclockwise, the one end 31a1 slides on the sliding surface 31b1 of the second lever 31b. While sliding on the sliding surface 31b1, the one end 31a1 moves so as to push down the sliding surface 31b1 of the second lever 31b in the CB direction.

[0045] The second lever 31b operates in the same manner as in the case of the paper P transported in the direction A shown in FIG. 7. That is, the sliding surface 31b1 of the second lever 31b is pressed down, and the second lever 31b rotates counterclockwise around the shaft 31b3 against the pulling force of the second spring 31f. At the same time, the end 31b2 of the second lever 31b also rotates counterclockwise and moves away from the position blocking the detection light of the detector 31c. Then, the detector 31c transitions to a paper-present state in which it detects the detection light. In this way, the front detection unit 31 transitions from a paper-absent state in which the detector 31c does not detect the detection light to a paper-present state in which the detector 31c detects the detection light, and can detect the paper P transported in the B direction.

[0046] The paper P, whose rear end is detected by the front detection unit 31 to be at the position of the first lever 31a, is further transported in the direction B by the front roller pair 21 and the rear roller pair 22. In the case of continuous paper F, printing is performed by the head 20 while being transported in the direction B by the front roller pair 21 and the rear roller pair 22. The paper P is further transported in the direction B by the front roller pair 21 and the rear roller pair 22, passes through the no-paper state of the front detection unit 31 shown in FIG. 6, and is discharged toward the user.

[0047] As described above, by operating the first lever 31a and the second lever 31b of the front detection unit 31, the front detection unit 31 can detect the paper-present and paper-absent states of the paper P and the continuous paper F, as well as detect the leading and trailing ends of the paper P transported in direction A, the trailing and leading ends of the paper P transported in direction B, and the leading and trailing ends of the continuous paper F transported in direction B. Based on the detection of the paper P by the front detection unit 31, the front roller pair 21 and the rear roller pair 22 can transport the paper P to a target position. Also, the head 20 can print on the paper P at the target position.

[0048] The above description has been given as an example of the operation of the front detection unit 31. The operation of the rear detection unit 41 is also similar to that of the front detection unit 31, and the operations of the first lever 31a, the second lever 31b, and the detector 31c in the front detection unit 31 correspond to the operations of the first lever 41a, the second lever 41b, the detector 41c, and the holder 41d in the rear detection unit 41, respectively.

[0049] According to the printing device 10 of the above-described embodiment, the shape of the first lever 31a that contacts the paper P can be simplified, and the size and space required can be reduced. In particular, the portion of the first lever 31a that advances into the front guide surface 13 can be simple and small in configuration. The front detection unit 31 on which the first lever 31a is mounted can also be simplified in mechanism and made small. As a result, the entire printing device 10 can also be made small. Although these embodiments have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and may be modified, substituted, deleted, etc. without departing from the spirit of the present invention. Although the printing device 10 has been described as a dot impact printer, any printing method can be used for the head 20. For example, the printing device 10 may be an inkjet printer equipped with an inkjet head. Although the detector 31c of the front detection unit 31 has been described as a transmission type optical sensor, any type of sensor can be used as long as it can detect the movement of the end 31b2 of the second lever 31b. It may be a reflection type optical sensor or a mechanical switch. [Explanation of symbols]

[0050] 10...printing device, 13...front guide surface, 14...rear guide surface, 21...front roller pair, 22...rear roller pair, 31...front detection unit, 41...rear detection unit, 31a, 41a...first lever, 31b, 41b...second lever, 31b1...sliding surface, 31c, 41c...detector, 31d, 41d...holder, P...paper.

Claims

1. A guide surface that guides the recording medium; The recording medium is moved along the guide surface in a first direction and a second direction opposite to the first direction. A conveying unit capable of conveying in two directions; a detection unit that detects the recording medium, The detection unit is When the recording medium is not in contact with the recording medium, the recording medium is in an advanced position advanced from the guide surface. When the recording medium is conveyed in one direction, the recording medium is rotated in a first rotation direction to the advance position. When the recording medium is conveyed in the second direction, the first rotation direction is reversed. a first lever that rotates in a second rotation direction that is the opposite direction to the first rotation direction and retreats from the advanced position; The first lever rotates in the first rotation direction or the second rotation direction. A second lever; a detector that detects the rotation of the second lever, When the first lever is in the advanced position, The first lever extends vertically upward from a rotation axis of the first lever, The second lever extends vertically downward from a rotation axis of the second lever, A lower end of the second lever faces the detector, The second lever is a sliding surface that is slid by the first lever, The first lever rotates in either the first rotation direction or the second rotation direction. The sliding surface is moved while being slid by the first lever, so that the first lever It rotates in the same direction regardless of the direction of rotation of Printing device.

2. The sliding surface of the second lever and the portion of the first lever that slides on the sliding surface are Each is made of a different material. The printing device of claim 1 .

3. The detection unit is a holder for rotatably supporting the first lever and the second lever; The printing device according to claim 1 or 2.

4. The detection unit is a first elastic member extending between the first lever and the holder; and a second elastic member extending between the first lever and the holder. and a second elastic member disposed between the holder, The first elastic member pulls the first lever toward the advanced position, The second elastic member is configured to move the first lever toward the advanced position via the sliding surface. Pull two levers, The printing device according to claim 3 .

5. The first elastic member and the second elastic member each extend in a vertical direction. The printing device according to claim 4.

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