JP2003335016A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the positioning accuracy of a pinch roller block and a head block held to be close to and away from a driving roller and a platen. <P>SOLUTION: The pinch roller block 11 and the head block 14 are held integrally by a holding part 20 which holds the pinch roller block 11 and the head block 14 rotatably to be close to and away from the driving roller 10 and the platen 13 in a printer 1 for printing to papers by transferring the papers. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a printer that prints on the paper.

[0002]

2. Description of the Related Art Conventionally, there is a printer in which a roll paper, which is a paper, is conveyed along a paper conveyance path and a printing section prints on the paper in the conveying process.

In such a printer, it is possible to obtain a carrying force for carrying the paper by sandwiching the paper with the platen and the print head which form the printing unit and rotating the platen, but the driving roller and the pinch roller are used. There is a printer that further includes a transport unit that is composed of.

The reason why such a transport unit is provided will be described below. In a printer using an ink ribbon, at the time of printing, the ink ribbon is interposed between the paper and the print head to print on the paper, but when the paper is conveyed without printing on the paper, In some printers, the print head is separated from the platen, and the supply of the ink ribbon to the print head is stopped to suppress wasteful consumption of the ink ribbon. At this time, since the print head is separated from the platen, it is not possible to carry the paper by sandwiching the paper between the print head and the platen.

Another reason is that when the print head is an end face head, the print head cannot be strongly pressed against the platen, so that the paper cannot be conveyed only by the conveying force by the rotation of the platen. It can be mentioned.

In the printer as described above, the pinch roller is held by the pinch roller block, the print head is held by the head block, and the pinch roller block and the head block are moved toward and away from the drive roller and the platen. There is a pinch roller block and a pinch roller block which is held by a holding unit so as to be rotatable about a fulcrum located on one side of the sheet in the width direction.
By rotating the pinch roller block and the head block so as to separate from the drive roller and the platen, the paper conveyance path is opened, which facilitates the work of setting the ink ribbon between the print head and the platen. It is intended to facilitate the work of setting the paper on the paper transport path and the paper jam processing work on the paper transport path.

[0007]

However, the pinch roller block and the head block are rotatably held by two independent holding portions, respectively, which allows positioning in mounting the pinch roller block and the head block. There is a problem that the accuracy becomes low.

In the printer in which the pinch roller block and the head block are rotatably held by the two independent holding portions, the holding portion and the head block are rotated in order to rotate the pinch roller block and the head block at the same time. There is another part that attracts the pinch roller block and head block with a magnet,
Even in this case, since the holding portions of the pinch roller block and the head block are also separate, the problem that the positioning accuracy in mounting the pinch roller block and the head block becomes low still remains.

An object of the present invention is to improve the positioning accuracy of the pinch roller block and the head block which are held so as to approach and separate from the drive roller and the platen.

[0010]

A printer according to the present invention comprises a pinch roller block for holding a pinch roller for sandwiching the paper between the drive roller and the drive roller for conveying the paper.
A head block that faces a platen and holds a print head that prints on the sheet, and one side in the width direction of the sheet so that the pinch roller block and the head block approach and separate from the drive roller and the platen. And a holding portion that holds the pinch roller block and the head block integrally and rotatably around a fulcrum located at.

Therefore, the pinch roller block and the head block are rotatably and integrally held by the holding portion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. The present embodiment is an example of application to a so-called center-based thermal printer in which the positioning reference of the paper is the center in the paper width direction orthogonal to the paper transport direction, and roll paper is used as the paper.

FIG. 1 is a perspective view schematically showing the external appearance of the printer. As shown in FIG. 1, on the front surface of the main body housing 2 of the printer 1, the printed sheet A (see FIG.
A discharge port 3 is formed for discharging (see). On the left side of the main body housing 2, a control box 6 having various operation keys 4 and a display unit 5 on the front surface is provided. Inside the control box 6, there is provided a control unit (not shown) for driving and controlling each unit of the printer 1. A cover 7 that opens and closes the inside of the main body housing 2 is provided on the right side of the main body housing 2. The cover 7 is provided rotatably in an upward direction around a hinge 8 provided on the control box 6 side of the upper surface of the main body housing 2.

FIG. 2 is a perspective view schematically showing the printer 1 in a state where the cover 7 is opened and the paper transport path is opened, and FIG. 3 shows a state in which the cantilever unit is in the open position. FIG. 4 is a perspective side view schematically showing an internal structure of the printer 1, FIG. 5 is a perspective view showing a cantilever unit fixed to a holding side plate, and FIG. 6 is a mounting structure of the cantilever unit 22. FIG. 7 is a plan view showing the mounting structure of the cantilever unit, (a) is a front view showing a state where the cantilever unit is in an operating position, and (b) is a front view showing a state where the cantilever unit is in an opening position. It is a figure. In addition,
2 and 3 omit a part of the members, and FIG. 4 shows a state in which the paper A and the ink ribbon B are set.

As shown in FIGS. 2 to 5, the printer 1
The main body housing 2 has a sheet holding section 9 for storing and holding a roll sheet of the sheet A, a driving roller 10 and a pinch roller block 11, and a conveying section 1 for conveying the sheet A.
2. Paper A having a platen 13 and a head block 14
There are provided a printing unit 15 for printing on, a ink ribbon supply unit 16 for supplying the ink ribbon B to the printing unit 15, a transmissive sensor 17 for detecting the paper A, a paper guide unit 18 for guiding the paper A, and the like. Inside the main body housing 2, the sheet holding section 9, the sheet guide section 18, and the transport section 1 are provided.
2. A paper transport path 19 is provided to reach the discharge port 3 via the transmissive sensor 17 and the printing unit 15.

The pinch roller block 11 and the head block 14 are integrally held by a holding portion 20 and are rotatably held by the holding portion 20 with respect to the main body housing 2. Specifically, the pinch roller block 11 and the head block 14 have their one ends fixed to the sheet metal frame 21 of the holding unit 20. Here, the pinch roller block 11 and the head block 14
Is fixed to the metal plate frame 21 to form a cantilever unit 22.

As shown in FIGS. 5 to 7, the sheet metal frame 21 is arranged on one side of the paper transport path 19 on the control box 6 side. The sheet metal frame 21 is provided with a pair of arms 24 and 25 which penetrate the side plate 23 of the control box 6 from one surface on the control box 6 side, extend inside the control box 6, and are opposed to each other with a gap in the paper transport direction. There is. These arms 24 and 25 are used for the paper transport path 19
It is rotatably held by a support shaft 26 as a fulcrum provided in the control box 6 on one side (one side in the width direction of the sheet A). The axial direction of the support shaft 26 is the same as the paper transport direction. Then, the cantilever unit 22 uses a support shaft 26 as a fulcrum and an operation position where printing operation is possible, and a paper sheet so that the pinch roller block 11 and the head block 14 approach and separate from the drive roller 10 and the platen 13. It is rotatable with respect to an open position where the transport path 19 is opened. As a result, the pinch roller block 11 and the head block 14 integrally rotate in the same direction. Here, the arms 24, 2
5, the support shaft 26 constitutes the holding portion 20.

The cantilever unit 22 is pulled upward by the coil springs 27a and 27b functioning as tension springs so as to rotate from the operating position to the open position. These coil springs 27 a and 27 b are supported by the arms 24 and 25 and the upper portion of the main body housing 2, respectively. When the cantilever unit 22 is in the operating position, the cantilever unit 22 is positionally fixed by a fixing member (not shown) against the pulling force of the coil springs 27a and 27b. The fixing member is composed of a pair of magnets provided in the cantilever unit 22 and the main body housing 2, respectively.
The magnetic force fixes the cantilever unit 22 in the operating position.

The free end of the cantilever unit 22 is fixed to the main body housing 2 by the holding side plate 28 provided on the main body housing 2 in the operating position. As a result, the positioning accuracy of the members constituting the cantilever unit 22 is improved and the mounting rigidity is ensured. The holding side plate 28 connects the cantilever unit 22 to the main body housing 2
Is rotatably attached to the main body housing 2 between a fixed position (FIG. 5) for fixing the cantilever unit 22 to the main body housing 2 and a fixed release position (FIG. 2) for releasing the fixation of the cantilever unit 22 to the main body housing 2. .

The main body housing 2 of such a printer 1
Each part provided inside the unit will be described below.

First, the printing section 15 will be described. Here, FIG. 8 is a perspective view showing the head block 14, FIG. 9 shows the head block 14, (a) is a vertical sectional front view showing a state in which the thermal head is in the separated position, and (b) is the thermal head in the printing position. FIG. 10 is an exploded perspective view showing the head block 14 in the state of FIG.

As shown in FIGS. 8 to 10, the printing unit 1
The head block 14 constituting 5 comprises a thermal head 29 as a print head, a head moving mechanism 30, and a head block cover 31 for holding the thermal head 29 and the head moving mechanism 30.

The head block cover 31 is fixed to the sheet metal frame 21 with an auxiliary side plate 32 facing the sheet metal frame 21 at a predetermined interval on the side opposite to the sheet metal frame 21 side in the sheet conveying path 19.

The thermal head 29 includes a plurality of heating elements 2.
9a is a line thermal head linearly arranged so as to be parallel to the axial direction of the platen 13,
Opposes the platen 13. The thermal head 29 is fixed to the head bracket 33. The head bracket 33, which will be described in detail later, is provided so as to be able to move toward and away from the platen 13 by linear movement, whereby the heating element 29a of the thermal head 29 can be moved toward and away from the platen 13 by moving linearly. Can come into contact with. Since the thermal head moves linearly toward and away from the platen, the arrangement direction of the heating elements of the thermal head and the axial direction of the platen are always kept parallel. Here, the heating element 29a contacts the platen with the cantilever unit 22 in the operating position.

As shown in FIGS. 9 and 10, the head moving mechanism 30 includes a head pressing mechanism 34 and a head separating means 3.
It is composed of 5 and.

As shown in FIGS. 9 and 10, the head pressing mechanism 34 is a leaf spring 36 attached to the head bracket 33, and a cam provided above the leaf spring 36 and parallel to the platen 13. Shaft 37 and this camshaft 3
It is constituted by a plate cam 38 and the like which are fixedly provided at 7.

The cam shaft 37 is rotatably held by the metal plate frame 21 and the auxiliary side plate 32. Auxiliary side plate 3
A switching lever 39 that rotationally drives the cam shaft 37 is fixed to the end of the cam shaft 37 that penetrates through 2.

The leaf spring 36 is formed in a flat plate shape that is long in the paper width direction, is positioned above the thermal head 29, and has both ends fixed to the head bracket 33.

When the switching lever 39 is operated and the cam shaft 37 rotates, the plate cam 38 is displaced, and the plate cam 38 is displaced.
Presses the leaf spring 36. As a result, the head pressing mechanism 34 urges the thermal head 29 so that the heating element 29a of the thermal head 29 contacts the platen. When the plate cam 38 is in a position where it does not press the plate spring 36, the head pressing mechanism 34 does not bias the thermal head 29. Here, an intermediate portion of both end portions of the leaf spring 36 supported by the head bracket 33 coincides with a central position of the thermal head in the arrangement direction of the heating elements 29a of the thermal head 29 as viewed from above, and an intermediate portion thereof. The plate cam 38 is positioned so as to bias.

The head separating means 35 includes a coil spring 40.
a, 40b, and these coil springs 4
Both ends of 0a and 40b are supported by the head bracket 33 and the cam shaft 37 and function as tension springs, and generate a separating and biasing force that biases the thermal head 29 in a direction of separating from the platen 13. Coil springs 40a, 40b
Are respectively supported on both ends of the head bracket 33. When the urging force of the leaf spring 36 becomes smaller than the separating and urging force according to the displacement of the leaf cam 38, the coil springs 40 a and 40 b are, for example, the head pressing mechanism 34.
Is not urging the thermal head 29 toward the platen 13, the thermal head 29 is linearly moved to a position separated from the platen 13 by a predetermined distance (hereinafter, referred to as a separated position). Here, the above-described head pressing mechanism 34 linearly moves the thermal head 29 to a position where the thermal head 29 contacts the platen (hereinafter referred to as a printing position) against the biasing force of the coil springs 40a and 40b.

In the printing unit 15, the ink ribbon B (see FIG. 4) is interposed between the thermal head 29 urged by the head pressure mechanism 34 and the paper A, and the heat generating element 29a generates heat. Printing is performed.

Here, the mounting structure of the head bracket 33 to the sheet metal frame 21 and the head block cover 31 will be described in detail.

As shown in FIGS. 9 and 10, first, both side plates 41 and 42 facing the auxiliary side plate 32 of the head block cover 31 and the sheet metal frame 21 are formed at both ends of the head bracket 33. . Further, four cylindrical guide shafts 43 to 46 are respectively provided at portions of the sheet metal frame 21 and the auxiliary side plate 32 of the head block cover 31 facing the head bracket 33.

Both side plates 41, 42 of the head bracket 33
There are formed four elongated holes 47 to 50, respectively. The long holes 47 and 48 are respectively located at the upper and lower portions on the downstream side in the paper transport direction with respect to the center of the head bracket 33 in the paper transport direction, and the long holes 49 and 50 are located in the head bracket 33 in the paper transport direction. It is positioned at the upper part and the lower part on the upstream side in the paper transport direction with respect to the center. These long holes 47 to 50 are used for the thermal head 2.
The heating element 29a of No. 9 is formed with the longitudinal direction being the approaching / separating direction with respect to the platen 13 (the vertical direction orthogonal to the platen 13 in the present embodiment). The guide shafts 43 to 46 are inserted into the long holes 47 to 50 so as to be movable in the longitudinal direction. And these guide shafts 4
3, 44 and the long holes 47, 48, the thermal head 2
A head bracket 33 is connected to the metal plate frame 21 and the auxiliary side plate 32 so that the plate 9 can be brought into contact with and separated from the platen 13 by linear movement.

In addition, the head block 14 has a structure shown in FIG.
As shown in, a head-up mechanism 51 is provided. Here, FIG. 11 is a front view showing the head-up mechanism 51. The head-up mechanism 51 moves the thermal head 29 to a head-up position where it is separated from the sheet A when the sheet A is only conveyed without printing by the thermal head 29 in the printing operation. Specifically, the arm 52 having the engaging portions formed at both ends is held by the support shaft 53 provided on the inner surface of the head block cover 31 so as to be vertically rotatable. An engaging portion on one end side of the arm 52 is engaged with a pin 54 formed on the head bracket 33. Arm 52
The engaging portion on the other end side of is connected to a solenoid 55 provided inside the control box 6. When the solenoid 55 drives the arm 52, the arm 52
Rotates about the support shaft 53, whereby the head bracket 33 is moved in the vertical direction, and the thermal head 2
9 is reciprocated between the print position and the head-up position.

As shown in FIG. 2, the platen 13 is rotatably held by a side plate 23 of the control box 6 and a side plate 56 erected on the bottom plate of the main body housing 2 so as to face the side plate 23. There is. The platen 13 is rotationally driven by a motor (not shown) provided inside the control box 6. Then, the platen 13 is driven to rotate, so that the sheet A sandwiched between the thermal head 29 and the platen 13 is conveyed along the sheet conveying path 19. That is, the platen 13 also functions as a transport unit that transports the sheet A.

Next, the transport section 12 will be described. Figure 2
As shown in FIG. 4, the pinch roller block 11 that constitutes the transport unit 12 includes a pinch roller body 57 and a roller block cover 58 that holds the pinch roller body 57.
It is composed of and. Roller block cover 58
Are fixed to the sheet metal frame 21 by having auxiliary side plates 59 facing the sheet metal frame 21 with a predetermined gap.

The pinch roller body 57 is used for the paper transport path 19
Is arranged to face the drive roller 10 via a pinch roller block, and is biased by the biasing means (not shown) provided in the pinch roller block 11 so as to come into contact with the drive roller 10. Here, the pinch roller body 57 contacts the drive roller 10 with the cantilever unit 22 positioned in the operating position. The pinch roller body 57 is provided between two pinch rollers 60a and 60b arranged at a predetermined interval on the upstream side and the downstream side of the drive roller 10 in the sheet conveying direction and the pinch roller bodies 60a and 60b. And a rubber belt 61 which is an endless belt that functions as a pinch roller.

The drive roller 10 is rotatably held by the side plates 23 and 56. The drive roller 10 is rotationally driven by a motor (not shown) provided inside the control box 6. Then, the drive roller 10 is rotationally driven, so that the sheet A sandwiched between the drive roller 10 and the pinch roller body 57 is transported along the sheet transport path 19.

Next, the transmissive sensor 17 will be described with reference to FIGS. FIG. 12 is a perspective view showing the mounting structure of the transmissive sensor 17, and FIG. 13 shows the transmissive sensor 17 positioned near the control box 6.
FIG. 14A is a front view showing a state in which the transmissive sensor 17 is closed, FIG. 14B is a front view showing a state in which the transmissive sensor 17 is open, and FIG. 14 is a transmission positioned far from the control box 6. The type | mold sensor 17 is shown, (a) is a front view which shows the state which the transmissive sensor 17 closed, and (b) is a front view which shows the state which the transmissive sensor 17 opened.

As shown in FIG. 12 to FIG. 14, the transmissive sensor 17 has a light emitting element 17a and a light receiving element 17b which are opposed to each other via a sheet conveying path 19, and has a light emitting element 17a and a light receiving element 17b. The sheet A located between the two is detected. The transmissive sensor 17 is held by a sensor holder 62 having a lower holder 62a and an upper holder 62b formed long in the paper width direction. The light emitting element 17a is attached to the lower holder 62a, and the light receiving element 17b is attached to the upper holder 62b. Here, the sensor block 6 is provided by the upper holder 62b and the light receiving element 17b.
3 are configured. Here, the sensor block 63 is not limited to the one having the light receiving element 17b, but may be any one of the light emitting element 17a and the light receiving element 17b.

One end of the upper holder 62b on one side of the sheet conveying path 19 on the side of the control box 6 has a lower holder 6a.
It is held by a support shaft 64 as a fulcrum provided at one end on the side of the control box 6 of 2a with the sheet conveying direction as the axial direction. In the upper holder 62b, an operation position in which the light emitting element 17a and the light receiving element 17b face each other with the paper conveyance path 19 in between with the support shaft 64 as a rotation center, and the paper conveyance path 1
It is rotatable with respect to an open position where 9 is opened.

The lower holder 62a is slidably held by a guide shaft 65 which is parallel to the platen 13 and is provided on one side surface of the side plate 23 of the control box 6 so as to project in the paper width direction. As a result, the sensor holder 62
The whole is reciprocally movable along the paper width direction.

The upper holder 62b is slidably attached to the roller block cover 58. Specifically, a mounting member 66 is rotatably attached to the free end of the upper holder 62b by a support shaft 67 in the same direction as the rotating direction of the upper holder 62b. This mounting member 66
Is fixed to the roller block cover 58 by a thumbscrew 69 slidably inserted in an elongated hole 68 formed in the roller block cover 58. The long hole 68 is formed long in the axial direction of the platen 13, and the sensor holder 62 can reciprocate in the paper width direction by loosening the knob screw 69. As a result, the transmissive sensor 17
It is possible to adjust the position of the paper in the paper width direction. As a result, in the sensor holder 62, the lower holder 62a moves while sliding on the guide shaft 65, so that the rotation center (support shaft 26) of the cantilever unit 22 and the upper holder 62b.
Even if the center of rotation (the support shaft 64) is not on the same axis, the upper holder 62b rotates in the same direction as the rotation direction of the cantilever unit 22 without any trouble.

Next, as shown in FIGS. 2 and 4, the ink ribbon supply unit 16 holds the unused ink ribbon B and supplies it to the printing unit 15, and the used ink ribbon B. And a ribbon take-up shaft 71 for taking up. The ribbon supply shaft 70 and the ribbon winding shaft 71 are
It is rotationally driven by a motor (not shown) provided inside the control box 6. The ink ribbon B held by the ribbon supply shaft 70 and supplied to the printing unit 15 passes through between the thermal head 29 and the platen 13 and the ribbon take-up shaft 71.
To be wound up.

Next, the paper holding unit 9 will be described. As shown in FIGS. 2 and 4, the paper holding unit 9 includes a paper holding shaft 72 that holds the paper A, and a pair of side fences that restrict the movement of the paper A held by the paper holding shaft 72 in the width direction. 73a and 73b are provided.

As shown in FIG. 4, when label paper, in which labels are attached at a predetermined interval on a mount, is used as the paper A on the downstream side of the platen 13 in the main body housing 2 in the paper transport direction. Further, a peeling plate 74 for peeling the label from the mount is provided. Although not shown in particular, the mount paper after the label paper is peeled off is wound up on the mount paper winding portion provided on the lower side of the main body housing 2.

In such a structure, the paper transport path 1
In setting the paper A on the sheet 9 and the ink ribbon B on the printing unit 15, first, the holding side plate 28 is rotated to the fixing release position to release the fixing of the free end of the cantilever unit 22. Next, the cantilever unit 22 is rotated to the open position to open the paper transport path 19. Then, the sheet A held by the sheet holding unit 9 is pulled out along the drive roller 10 and the platen 13. Next, the ink ribbon B is interposed between the thermal head 29 and the paper A, and the cantilever unit 22 is rotated from the open position to the operating position. As a result, the paper A is fed to the paper transport path 19
Is set to. Next, the holding side plate 28 is rotated to the fixed position to fix the free end of the cantilever unit 22. Then, by operating the lever of the head pressing mechanism 34 to linearly move the thermal head 29 from the separated position to the printing position, printing on the paper A becomes possible.

In the printing operation, the paper A is used as described above.
And the ink ribbon B to the paper transport path 19 and the printing unit 15.
Drive roller 10 and platen 13
By rotating the paper, the paper A is fed to the paper conveyance path 1
9, the ribbon supply shaft 70 and the ribbon take-up shaft 71 are rotationally driven to supply the ribbon to the printing unit 15, and the thermal head 2
Ink ribbon B is generated by causing a predetermined heating element 29a of No. 9 to generate heat.
Printing is performed on the sheet A by melting the ink applied to the sheet A. At this time, the transmissive sensor 17 detects whether or not there is a sheet A to be printed on the sheet conveyance path 19. If the paper A is label paper,
The transmissive sensor 17 detects a label or a black mark printed on the back surface of the paper A at predetermined intervals.

In the printing operation, when the printing is not performed for a predetermined time, the solenoid 5 of the head-up mechanism 51
5 is driven to move the thermal head 29 to the head-up position. At the same time, the rotational drive of the ribbon supply shaft 70 and the ribbon winding shaft 71 is stopped. This allows
Since the ink ribbon B is not supplied to the printing unit 15, it is possible to reduce the wasteful ink ribbon B that is not used for printing. At this time, the sheet A is transported by the transport force of the transport unit 12.

As described above, in the printer 1 according to the present embodiment, the pinch roller block 11 and the head block 14 are rotatably held so as to move toward and away from the drive roller 10 and the platen 13. ,
Since the pinch roller block 11 and the head block 14 are integrally held, the positioning accuracy of the pinch roller block 11 and the head block 14 can be improved. As a result, the print quality can be improved.

Further, since the pinch roller block 11 and the head block 14 are held by the single holding portion 20, the conventional printer in which the pinch roller block 11 and the head block 14 are held by the individual holding portions, respectively. Compared with this, it is possible to reduce the number of parts and the number of assembling steps of the holding unit 20, and it is possible to reduce the cost.

Further, since the pinch roller block 11 and the head block 14 are fixed to one sheet metal frame 21, the positional relationship between the pinch roller block 11 and the head block 14 is fixed, and the sheet A is stably conveyed. be able to.

In the present embodiment, as the head moving mechanism 30, the thermal head 29 is linearly moved with respect to the platen 13, but the head moving mechanism 30 is not limited to this. For example, by rotating the thermal head 29 with respect to the platen 13 about a support shaft that is parallel to the axis of the platen 13, the arrangement direction of the heating elements 29a of the thermal head 29 is aligned with the axis of the platen 13. The thermal head 29 may be moved toward and away from the platen 13 by keeping them parallel to each other.

As described above, in the printer 1 according to the present embodiment, the thermal head 29, which is the print head, has the plurality of heating elements 29a arranged in a straight line, is provided in the head block 14, and the thermal head 29 is provided. By providing a head moving mechanism 30 that keeps the arrangement direction of the heating elements 29a of 29 to be parallel to the axial direction of the platen 13 and moves the thermal head 29 toward and away from the platen 13, In setting the ink ribbon B between the platen 13 and the thermal head 29 at the print position, if the cantilever unit 22 is rotated from the open position to the print position,
Since pressure is applied to the ink ribbon B sequentially from the side closer to the support shaft 26, wrinkles may occur on the ink ribbon B sandwiched between the thermal head 29 and the platen 13, but in the present embodiment, as described above. Ink ribbon B depending on the procedure
Is set in the printing portion 15, the thermal head 29 contacts the ink ribbon B while keeping the arrangement direction of the heating elements 29a of the thermal head 29 parallel to the axial direction of the platen 13, The pressure can be applied evenly, and wrinkles can be prevented from occurring on the ink ribbon B.

Further, the printer 1 of the present embodiment has a light emitting element 17a and a light receiving element 17b, and a transmissive sensor 17 for detecting the sheet A located between the light emitting element 17a and the light receiving element 17b. , A light-emitting element 17a or a light-receiving element 17b, and a support shaft 64 as a fulcrum located on one side in the width direction of the sheet A so that the light-emitting element 17a and the light-receiving element 17b come close to and away from each other. By providing the pinch roller block 11 and the sensor block 63 that rotates integrally with the head block 14, which is rotatably provided as a center, by rotating the cantilever unit 22 to the open position, Since either the light emitting element 17a or the light receiving element 17b of the transmissive sensor 17 is rotated to the open position, the transport unit 12 and the printing unit 1
5 and the transmissive sensor 17, the work space for various works such as cleaning work, inspection work and jam clearance work can be expanded, and the work can be facilitated.

[0057]

According to the present invention, the pinch roller block and the head block are integrally held by the holding portion that rotatably holds the pinch roller block and the head block so as to move toward and away from the drive roller and the platen. Therefore, the positioning accuracy of the pinch roller block and the head block can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an external appearance of a printer according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing the printer with a cover opened and a paper conveyance path opened.

FIG. 3 is a perspective view showing a state where the cantilever unit is in an open position.

FIG. 4 is a vertical sectional side view schematically showing the internal structure of the printer.

FIG. 5 is a perspective view showing a cantilever unit fixed to a holding side plate.

FIG. 6 is a plan view showing a mounting structure of a cantilever unit.

FIG. 7 shows a mounting structure of a cantilever unit, (a)
Is a front view showing the state where the cantilever unit is in the operating position,
(B) is a front view showing a state in which the cantilever unit is in the open position.

FIG. 8 is a perspective view showing a head block.

9A and 9B show head blocks, FIG. 9A is a vertical sectional front view showing a state in which a thermal head is in a separated position, and FIG. 9B is a vertical sectional front view in which a thermal head is in a print position.

FIG. 10 is an exploded perspective view showing a head block.

FIG. 11 is a front view showing a head-up mechanism.

FIG. 12 is a perspective view showing a mounting structure of a transmissive sensor.

13A and 13B show a transmissive sensor positioned near a control box, FIG. 13A is a front view showing a state in which the transmissive sensor is closed, and FIG. 13B shows a state in which the transmissive sensor is opened. It is a front view.

14A and 14B show a transmissive sensor positioned far from the control box, FIG. 14A is a front view showing a state in which the transmissive sensor is closed, and FIG. 14B shows a state in which the transmissive sensor is opened. It is a front view.

[Explanation of symbols]

1 ... Printer, 10 ... Drive roller, 11 ... Pinch roller block, 13 ... Platen, 14 ... Head block, 1
7 ... Transmissive sensor, 17a ... Light emitting element, 17b ... Light receiving element, 20 ... Holding part, 26 ... Support point (support axis), 29 ... Print head (thermal head 29), 29a ... Heating element, 30
... head moving mechanism, 57 ... pinch roller (pinch roller body), 63 ... sensor block, 64 ... fulcrum (fulcrum), A
… Paper

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C058 AB16 AC06 AC12 AE04 AF20                       AF31 DA10                 2C064 CC02 CC06 CC11 EE02 EE06                       EE15 FF06                 3F103 AA02 BA01 BA25

Claims (3)

[Claims] 1. A pinch roller block that holds a pinch roller that sandwiches the paper between a drive roller that is rotationally driven and the drive roller for conveying the paper, a platen, and the paper that faces the platen. A head block for holding a print head for printing on, and a fulcrum located on one side in the width direction of the paper so that the pinch roller block and the head block approach and separate from the drive roller and the platen. And a holding unit that holds the pinch roller block and the head block as a unit in a rotatable manner. 2. The print head has a plurality of heating elements linearly arranged, is provided in the head block, and the direction of arrangement of the heating elements of the print head with respect to the axial center direction of the platen. 2. The printer according to claim 1, further comprising a head moving mechanism that keeps the print head parallel to and moves the print head toward and away from the platen. 3. A transmissive sensor having a light emitting element and a light receiving element for detecting the paper sheet located between the light emitting element and the light receiving element; and one of the light emitting element or the light receiving element. The pinch roller block and the head block are provided so as to be rotatable about a fulcrum located on one side in the width direction of the paper so that the light emitting element and the light receiving element are separated from each other. The printer according to claim 1, further comprising a sensor block that rotates integrally.