JP2022161498A - Printing apparatus - Google Patents

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

The present invention relates to printing devices.

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2002-100002, a printing apparatus is known that detects a recording medium using a cantilevered lever that contacts the recording medium.

JP 2015-9915 A

In the printing apparatus described above, the shape of the lever that contacts the recording medium may become complicated and large.

A printing apparatus includes a guide surface for guiding a recording medium, a conveying unit capable of conveying 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 for detecting a recording medium, wherein the detection unit is at an advanced position where the recording medium is advanced from the guide surface when not in contact with the recording medium, and is in contact with the recording medium conveyed in the first direction. Then, when it rotates in the first rotation direction and retreats from the advanced position, and contacts the recording medium conveyed in the second direction, it rotates in the second rotation direction opposite to the first rotation direction. A first lever that rotates and retreats from the advanced position, a second lever that rotates as the first lever rotates in the first rotation direction or the second rotation direction, and rotation of the second lever. and a detector for detecting the

1 is a perspective view showing the appearance of a printing apparatus according to one embodiment; FIG. FIG. 1 is a cross-sectional view showing a cross section of a main part of a printing apparatus according to one embodiment; FIG. 3 is an enlarged perspective view of the lower portion of the main part of FIG. 2; The perspective view which shows the detection part which concerns on one Embodiment. The perspective view which shows the 1st lever of the detection part which concerns on one Embodiment. FIG. 4 is a cross-sectional view showing the detection unit when no recording medium is detected; FIG. 5 is a cross-sectional view showing the detection unit when detecting a recording medium conveyed in the first direction; FIG. 5 is a cross-sectional view showing the detection unit when detecting a recording medium conveyed in the second direction;

1. Embodiment Hereinafter, a printing apparatus 10 according to one embodiment will be described with reference to the drawings.
Note that the directions in the drawing will be described using a three-dimensional coordinate system. For convenience of explanation, the positive direction of the Z axis is referred to as upward, upward, or simply upward, the negative direction is referred to as downward, downward, or simply downward, and the positive direction of the X axis is referred to as rightward, rightward, or simply right, negative direction. is referred to as leftward, leftward or simply left, the positive direction of the Y axis is referred to as rearward, rearward or simply rearward, and the negative direction is referred to as forward, frontward or simply forward.

1-1. 1. Configuration of Printing Apparatus A printing apparatus 10 shown in FIG. 1 includes a sheet-like recording medium (hereinafter simply referred to as paper) P such as paper or film cut into a predetermined length, folded fanfold paper, or the like. A recording medium (hereinafter simply referred to as continuous paper) F can be printed. The paper P may be, for example, a passbook, a postcard, an envelope, or the like.
As shown in FIG. 1, the printer 10 is covered with a case 11 and a cover 12 that can be opened and closed. The user is in front of the printing device 10 and works. A user holds the paper P and manually inserts it in the A direction, which is the first direction and the rearward direction, along the front side guide surface 13, which is the guide surface. The inserted paper P is conveyed in the A direction and printed. After printing, the paper P is returned in a second, forward direction, direction B, and ejected toward the user. The B direction is opposite to the A direction.

The configuration of the printing apparatus 10 will be described in detail with reference to FIG. The printing device 10 is, for example, a dot impact printer.

The head 20 is positioned facing 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 a pin through an ink ribbon toward the paper P to transfer ink from the ink ribbon onto the paper P for printing. A pin is also called a wire.

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 side roller pair 21 and the rear side roller pair 22 can convey the paper P and the continuous paper F in the A direction and the B direction along the front side guide surface 13 and the rear side guide surface 14 .

A front roller pair 21 composed of a driven roller 21 a and a driving roller 21 b is positioned in front of the head 20 and can nip the paper P and convey it along the front guide surface 13 . The drive roller 21b is driven by a motor.
A rear roller pair 22 composed of a driven roller 22 a and a driving roller 22 b is positioned rearward of the head 20 and can nip the paper P and convey it along the rear guide surface 14 . The drive roller 22b is driven by a motor.
The front side roller pair 21, the rear side roller pair 22, and the platen roller 23 transport the paper P and the continuous paper F in the A direction or the B direction along the front side guide surface 13 and the rear side guide surface 14 while interlocking with each other. It is possible.

The tractor unit 15 transports the continuous paper F set in the rearward direction of the printing device 10 in the C direction. The continuous paper F transported in the C direction is transported in the B direction along the rear guide surface 14 by the rear roller pair 22 . The continuous paper F is printed when it reaches the head 20, is conveyed in the direction B along the front guide surface 13 by the front roller pair 21, and is discharged toward the user.

1-2. Configuration of Detection Section As shown in FIGS. 2 and 3 , a front side detection section 31 as a detection section is positioned in the front direction of the head 20 , and a rear side detection section 41 as a detection section is positioned in the rear direction of the head 20 . position.
The front detector 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 detector 41 has the same configuration as the front detector 31, and is composed of a first lever 41a, a second lever 41b, a detector 41c, and a holder 41d having the same shape. The holder 41d rotatably supports the first lever 41a and the second lever 41b.

2 and 3 show a paper empty state in which there is no paper P on the front side guide surface 13 and the rear side guide surface 14. FIG. Since the first lever 31 a of the front side detection section 31 is not in contact with the paper P, it is at the advance position where it is advanced above the front side guide surface 13 . At this time, the front side detection section 31 detects the out-of-paper state. Similarly, since the first lever 41a of the rear detector 41 is not in contact with the paper P, it is at the advance position, which is the position where it advances upward from the rear guide surface 14. As shown in FIG. At this time, the rear detection section 41 detects the paper out state.

The configuration of the front detector 31 will be described in detail with reference to FIGS. 4 and 5. FIG. Note that the rear side detection section 41 is different from the front side detection section 31 only in arrangement, and has the same configuration as the front side detection section 31, so the description thereof will be omitted.
4 and 5 show a state in which the first lever 31a is at the advanced position and no paper is in contact with the paper P. FIG.
As shown in FIG. 4, the first lever 31a of the front detector 31 is rotatably supported by a holder 31d about a shaft 31a3. The second lever 31b is rotatably supported by the holder 31d around a shaft 31b3.

The second lever 31b has a sliding surface 31b1 shown in FIG. The first lever 31a has one end 31a1 and the other end 31a2. One end 31a1 or the other end 31a2 of the first lever 31a is slidable on the sliding surface 31b1 of the second lever 31b.

When the first lever 31a contacts the leading edge of the paper P conveyed in the direction A from the state in which the first lever 31a shown in FIG. It rotates clockwise, which is the direction, and retreats 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 portion 31a2 slides on the sliding surface 31b1 of the second lever 31b and pushes down the sliding surface 31b1 in the CA direction. The position where the first lever 31a is retracted from the advanced position toward the front guide surface 13 is referred to as the retracted position.

On the other hand, when the first lever 31a contacts the leading edge of the paper P conveyed in the B direction from the state in which the first lever 31a shown in FIG. It rotates counterclockwise, which is the direction of two rotations, and retreats from the advanced position toward the retracted position, and at the same time, one end 31a1 also rotates counterclockwise. At this time, one end portion 31a1 slides on the sliding surface 31b1 of the second lever 31b and moves so as to push down the sliding surface 31b1 in the CB direction.

Whether the first lever 31a contacts the paper P conveyed in the A direction and rotates clockwise or contacts the paper P conveyed in the B direction and rotates counterclockwise, the first lever 31a , while sliding on the sliding surface 31b1 of the second lever 31b, the sliding surface 31b1 is pushed down in the same direction.
Regardless of the rotation direction of the first lever 31a, the second lever 31b moves in the same direction as the sliding surface 31b1 is pushed down by the first lever 31a, thereby rotating in the same direction about the shaft 31b3. Rotate clockwise.

As described above, when the first lever 31a rotates in either direction due to the paper P being transported in the A direction or the paper P being transported in the B direction, the rotation of the first lever 31a causes the second lever 31b to rotate. The sliding surface 31b1 is pushed down while being slid by 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 portions 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 same friction load is applied to the paper in either direction.

The sliding surface 31b1 of the second lever 31b and the one end 31a1 and the other end 31a2 of the first lever 31a that slide on the sliding surface 31b1 are made of different materials. is preferred. Further, for example, it is preferable that they are made of resins having different slidability. As an 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). first name). The reverse combination may also be used.

By using different materials in this manner, the sliding surface 31b1 of the second lever 31b and the one end 31a1 and the other end 31a2 of the first lever 31a that slides on the sliding surface 31b1 are formed. Friction load and wear between can be suppressed.
Also, one end 31a1 and the other end 31a2 of the first lever 31a may be roller-shaped. Friction load and wear with the sliding surface 31b1 can be suppressed.

The detector 31c is a transmissive optical sensor. As shown in FIG. 4, when the first lever 31a is not in contact with the paper P, the detection light is blocked by the end 31b2 of the second lever 31b, and the detector 31c is in a state of not detecting the detection light. there is
As described above, when the first lever 31a comes into contact with the paper P transported in direction A or the paper P transported in direction B, it rotates clockwise or counterclockwise to move from the advanced position to the retracted position. do. At this time, as the first lever 31a rotates clockwise or counterclockwise, the second lever 31b also rotates counterclockwise.

As the second lever 31b rotates, the end portion 31b2 moves away from the detector 31c, and the detector 31c changes to the paper presence state for detecting the detection light. In this manner, the front detection unit 31 can detect the paper P conveyed in the A direction or the B direction by changing from the no paper state in which the detection light is detected to the paper presence state in which the detection light is detected.
Thus, when the first lever 31a does not come into contact with the paper P, the front detection section 31 can detect a no-paper state in which the detector 31c does not detect the detection light, and the first lever 31a comes into contact with the paper P. At this time, the detector 31c can detect the presence of paper by detecting the detection light.

As described above, FIG. 4 shows the state in which the first lever 31a is not in contact with the paper P and is in the advanced position. The detector 31c detects the out-of-paper state.
A first spring 31e, which is a first elastic member, spans between the first lever 31a and the holder 31d. The first spring 31e pulls the first lever 31a to hold it at the advanced position. When the first lever 31a comes into contact with the leading edge of the paper P conveyed in the direction A, 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 the presence of paper.

The paper P is printed by the head 20 while being transported in the A direction by the front roller pair 21 and the rear roller pair 22 . As the paper P is further conveyed in the direction A, the trailing 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, it rotates in the counterclockwise direction opposite to the clockwise direction due to the pulling force of the first spring 31e, and moves from the retracted position to the advanced position. The detector 31c detects the out-of-paper state.

When the trailing edge of the paper P passes the position of the first lever 31a and the printing on the paper P is completed, the paper P is transported in the direction B by the front roller pair 21 and the rear roller pair 22 and returned.
When the first lever 31a contacts the trailing edge of the paper P conveyed in the B direction, 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 presence of paper.

As the paper P is further conveyed 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 first lever 31a rotates in the clockwise direction opposite to the counterclockwise direction due to the pulling force of the first spring 31e, and moves from the retracted position to the advanced position. The detector 31c detects the out-of-paper state.

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

When the first lever 31a comes into contact with the paper P conveyed 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 is pushed down while sliding on the first lever 31a. rotates counterclockwise against the pulling force of the second spring 31f that pushes toward the advanced position. The detection light passes through the detector 31c due to the movement of the end portion 31b2 of the second lever 31b, and the detector 31c detects the presence of paper.

When the paper P is further conveyed in the A direction or the B direction by the front roller pair 21 and the rear roller pair 22, the trailing edge or 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 second lever 31b rotates clockwise, which is opposite to the counterclockwise direction, by the pulling force of the second spring 31f that moves the first lever 31a toward the advanced position. do. At this time, the sliding surface 31b1 of the second lever 31b pushes up while sliding on the first lever 31a, thereby moving the first lever 31a from the retracted position to the advanced position. The detection light is shielded by the end portion 31b2 of the second lever 31b, and the detector 31c detects that there is no paper.

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

1-3. Operation of Detection Unit The operation of the front detection unit 31 will be described in detail with reference to FIGS. 6 to 8. FIG. Note that the rear side detection section 41 differs from the front side detection section 31 only in its arrangement, and operates in the same manner as the front side detection section 31, so a description thereof will be omitted.

FIG. 6 shows a paper empty state in which there is no paper P on the front side guide surface 13 . Since the first lever 31 a of the front side detection section 31 is not in contact with the paper P, it is at the advance position where it is advanced above the front side guide surface 13 . The second lever 31b is in a position where the end portion 31b2 shields the detection light from the detector 31c, and is in a state of not detecting the detection light. In this manner, the front detection unit 31 can detect a paper-out state in which the detector 31c does not detect the detection light when there is no paper P on the front guide surface 13 and the first lever 31a does not contact the paper P. .

A first spring 31e bridged between the first lever 31a and the holder 31d pulls the first lever 31a to hold it at the advanced position. A second spring 31f bridged between the second lever 31b and the holder 31d pulls the second lever 31b so that the first lever 31a moves toward the advanced position via the sliding surface 31b1. there is
The first lever 31a can be returned from the retracted position to the advanced position by the pulling force of the first spring 31e and the second spring 31f when the front guide surface 13 runs out of the paper P and does not come into contact with the paper P.

When the paper P is conveyed in the A direction along the front guide surface 13, the front detection unit 31 shifts 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 contacts and is pushed by the leading edge of the paper P conveyed in the direction A, it rotates clockwise about the shaft 31a3 against the pulling force of the first spring 31e. and move from the extended position to the retracted position. At the same time, the other end 31a2 of the first lever 31a also rotates clockwise about the shaft 31a3. The other end 31a2 slides on the sliding surface 31b1 of the second lever 31b while rotating. The other end 31a2 slides on the sliding surface 31b1 and moves the sliding surface 31b1 of the second lever 31b downward in the CA direction.

When the sliding surface 31b1 is pushed down, the second lever 31b rotates counterclockwise about the shaft 31b3 against the pulling force of the second spring 31f. At the same time, the end portion 31b2 of the second lever 31b also rotates counterclockwise and moves away from the position where the detection light of the detector 31c is shielded. Then, the detector 31c changes to the paper presence state for detecting the detection light. In this way, the front detection unit 31 can shift from the no-paper state in which the detector 31c does not detect the detection light to the presence of paper state in which the detection light is detected, and can detect the paper P conveyed in the A direction. .

The paper P detected by the front detector 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, the head 20 performs predetermined printing. 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 the paper P by one line. do. When printing a plurality of lines, the operation of printing by the head 20 and the operation of conveying the paper P by the front side roller pair 21 and the rear side roller pair 22 are repeated.

Further, the paper P is conveyed in the direction A, and when the trailing edge of the paper P passes the position of the first lever 31a of the front side detection section 31, the front side detection section 31 changes from the paper existence state shown in FIG. 7 to the state shown in FIG. paper out state shown.
At this time, the paper P at the position of the first lever 31a on the front side guide surface 13 disappears, so the first lever 31a rotates counterclockwise around the shaft 31a3 by the pulling force of the first spring 31e, and reaches the retracted position. , and return to the advance position. At the same time, the other end 31a2 of the first lever 31a also rotates counterclockwise about the shaft 31a3.

Due to the counterclockwise rotation of the other end portion 31a2, the downward force in the CA direction applied to the sliding surface 31b1 of the second lever 31b ceases to act.
Therefore, the second lever 31b rotates clockwise about the shaft 31b3 by the pulling force of the second spring 31f that pushes up the sliding surface 31b1 in the direction opposite to the CA direction. At the same time, the end portion 31b2 of the second lever 31b also rotates clockwise and moves to a position where it blocks the light detected by the detector 31c. The detector 31c shifts to a paper-out state in which no detection light is detected.

In this way, the front detection unit 31 shifts from the paper presence state in which the detector 31c detects the detection light to the paper absence detection state in which the detection light is not detected, and the trailing edge of the paper P passes the position of the first lever 31a. can be detected.
The front detection unit 31 detects that the rear end of the paper P has passed the position of the first lever 31a, and the paper P is conveyed so as to be returned in the direction B by the front roller pair 21 and the rear roller pair 22, discharged towards the user.

The front roller pair 21 and the rear roller pair 22 can transport the continuous paper F transported from the C direction by the tractor unit 15 in the B direction. The operation of the front detection section 31 with respect to the paper P and the continuous paper F conveyed in the B direction will be described. Since the operation of the front side detection unit 31 is the same for the paper P and the continuous paper F, the case of the paper P will be described as an example.

The paper P is returned in the B direction by the front roller pair 21 and the rear roller pair 22 from the no paper state shown in FIG. When the sheet is conveyed so as to be held, the front side detection section 31 shifts to the paper presence state shown in FIG.
At this time, the first lever 31a contacts and is pushed by the trailing edge of the paper P conveyed in the B direction, and rotates counterclockwise about the shaft 31a3 against the pulling force of the first spring 31e. , moves from the extended position to the retracted position. At the same time, one end 31a1 of the first lever 31a also rotates counterclockwise about the shaft 31a3. One end 31a1 slides on the sliding surface 31b1 of the second lever 31b while rotating counterclockwise. One end 31a1 moves so as to push down the sliding surface 31b1 of the second lever 31b in the CB direction while sliding on the sliding surface 31b1.

The second lever 31b operates in the same manner as in the case of the paper P conveyed in the A direction shown in FIG. That is, the second lever 31b rotates counterclockwise around the shaft 31b3 against the pulling force of the second spring 31f by pushing down the sliding surface 31b1. At the same time, the end portion 31b2 of the second lever 31b also rotates counterclockwise and moves away from the position where the detection light of the detector 31c is shielded. Then, the detector 31c shifts to the paper presence state in which the detection light is detected.
In this way, the front detection unit 31 can shift from the no-paper state in which the detector 31c does not detect the detection light to the presence of paper state in which the detection light is detected, and can detect the paper P conveyed in the B direction. .

The front detection unit 31 detects that the trailing edge of the paper P is at the position of the first lever 31a, and the front roller pair 21 and the rear roller pair 22 further transport the paper P in the B direction. Further, in the case of the continuous paper F, printing is performed by the head 20 while being transported in the B direction 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 paper-out state of the front detection section 31 shown in FIG. 6, and is discharged toward the user.

As described above, the operation of the first lever 31a and the second lever 31b of the front side detection section 31 allows the front side detection section 31 to detect the presence state and the absence state of the paper P and the continuous paper F. It is possible to detect the leading edge and trailing edge of the paper P transported in the B direction, the trailing edge and leading edge of the paper P transported in the B direction, and the leading edge and trailing edge of the continuous paper F transported in the B direction.
Based on the detection of the paper P by the front detector 31, the front roller pair 21 and the rear roller pair 22 can convey the paper P to the target position. Also, the head 20 can print at a target position on the paper P. FIG.

In the above description, the operation of the front detection section 31 is taken as an example. The operation of the rear detection section 41 is the same as that of the front detection section 31, and the operations of the first lever 31a, the second lever 31b, and the detector 31c in the front detection section 31 , the first lever 41a, the second lever 41b, the detector 41c, and the holder 41d.

According to the printing apparatus 10 according to the above-described embodiment, the shape of the first lever 31a that contacts the paper P can be simplified, and the size and space can be reduced. In particular, the portion of the first lever 31a extending to the front guide surface 13 can be simple and small. The front side detector 31 on which the first lever 31a is mounted can also have a simple mechanism and can be made small. As a result, the entire printing apparatus 10 can also be made smaller.
As described above, these embodiments have been described in detail with reference to the drawings, but the specific configurations are not limited to these embodiments, and modifications, replacements, deletions, etc., can be made without departing from the gist of the present invention. good too.
Although the printing apparatus 10 has been described as an example of a dot impact printer, the printing method of the head 20 does not matter. For example, an inkjet printer having an inkjet head may be used.
Further, although the detector 31c of the front detector 31 has been described as a transmissive 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. A reflective optical sensor or a mechanical switch may be used.

DESCRIPTION OF SYMBOLS 10... Printing apparatus 13... Front side guide surface 14... Rear side guide surface 21... Front side roller pair 22... Rear side roller pair 31... Front side detection part 41... Rear side detection part 31a, 41a... First Lever 31b, 41b Second lever 31b1 Sliding surface 31c, 41c Detector 31d, 41d Holder P Paper.

Claims (5)

a guide surface for guiding the recording medium;
a conveying unit capable of conveying the recording medium along the guide surface in a first direction and in a second direction opposite to the first direction;
a detection unit that detects the recording medium,
The detection unit is
When it is not in contact with the recording medium, it is at an advanced position where it has advanced from the guide surface, and when it is in contact with the recording medium conveyed in the first direction, it rotates in the first rotation direction and retreats from the advanced position. a first lever that rotates in a second rotation direction opposite to the first rotation direction and retracts from the advanced position when the recording medium comes into contact with the recording medium being conveyed in the second direction;
a second lever that rotates as the first lever rotates in the first rotation direction or the second rotation direction;
a detector that detects rotation of the second lever;
printer. The second lever is
Having a sliding surface that slides on the first lever,
Regardless of whether the first lever rotates in the first rotation direction or the second rotation direction, the sliding surface slides on the first lever to move the first lever. rotate in the same direction regardless of the direction of rotation of
A printing device according to claim 1 . The sliding surface of the second lever and the portion of the first lever that slides on the sliding surface are made of different materials,
3. A printing device according to claim 2. The detection unit is
Having a holder that rotatably supports the first lever and the second lever,
4. The printing apparatus according to claim 2 or 3. The detection unit is
a first elastic member bridged between the first lever and the holder; and a second elastic member bridged between the second lever and the holder;
The first elastic member pulls the first lever toward the advanced position, and the second elastic member pulls the second lever toward the advanced position via the sliding surface. pull the lever
5. A printing device according to claim 4.

Images