JPH10193702A - Label printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a label printer having a platen roller for opening/closing a print head and provided with a driving force supply means for turning the platen roller stably. SOLUTION: The label printer comprises a driving force supply means P for rotary driving a platen roller 5 through an endless belt 15 disposed closely to a print head while traversing the pulley 15a of the platen roller 5. When the platen roller 5 is closed for the print head, the pulley 15a is pressed against the endless belt 15 to bring about a state where a driving force can be transmitted from the driving force supply means P to the platen roller 5. Consequently, a rotary driving force is transmitted surely to drive the platen roller 5 stably thus enhancing the print quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label printer which mounts a long strip of label paper on a label printer body, prints a supplied label, and issues the label.

[0002]

2. Description of the Related Art Conventionally, in order to exchange label paper in a printer that performs printing while conveying paper by rotating a platen roller, it is necessary to separate the print head from the platen roller and pass the label paper. Is pressed again. Here, in the method in which the platen roller can be opened and closed with respect to the print head, there is no need to consider the protection of the signal line (wire) connected to the print head as compared with the configuration in which the print head can be opened and closed. Although it is highly reliable, it is necessary to transmit a driving force to a platen roller that opens and closes. Conventionally, the transmission of the driving force to the platen roller has been performed by engaging a gear directly connected to the shaft of the platen roller with a gear on the drive supply side so as to be able to contact and separate therefrom.

[0003]

By the way, in the case of the above label printer, when the platen roller shaft and the driving gear are engaged with each other, the teeth of the platen roller shaft and the driving gear contact each other and do not engage with each other. There is
In this case, there is a problem that printing cannot be performed. Also,
In the case of the platen roller shaft and the drive gear, there has been a problem that if the teeth are forcedly brought into contact with each other, the teeth are damaged.

The present invention has been made in view of the above-mentioned problem, and has a configuration in which the platen roller is rotationally driven by an endless belt wound around a pulley of the platen roller when the platen roller is closed. It is an object of the present invention to provide a label printer which does not cause a problem of engagement between a platen roller shaft and a driving gear at the time of paper exchange and which can obtain an excellent effect that paper exchange can be performed with ease.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a label paper supply unit for supplying a long strip of label paper having a plurality of labels attached to a backing paper, a print head, and the printing head. In a label printer that inserts and prints label paper in a printing section composed of a platen roller that can be opened and closed with respect to the head, and further separates the printed label from the backing paper and supplies it to a predetermined position, the rotational driving force is applied to the platen roller And a driving force supply unit for supplying the driving force, the driving force supply unit includes a pulley attached to a platen roller, an endless belt pressed against the pulley when the platen roller is closed, and rotating the endless belt. And a platen roller drive source for driving the label paper. When the platen roller is closed, the platen roller presses the label paper to pinch it between the print head and the platen roller is driven to rotate by the endless belt pressed against the pulley of the platen roller. A label printer characterized in that it becomes possible is a means for solving the above problem.

The label paper supply unit and the platen roller
It is preferable that the operation is controlled so that the label paper is supplied from the label paper supply unit when the platen roller is closed. As a result, the label paper disposed between the print head and the platen roller is moved to the print head by the platen roller moved in the closing direction, and the label paper is newly drawn out from the label paper supply unit. As the endless belt, a belt formed mainly of rubber and having a large friction coefficient is employed. This prevents slippage between the pulley of the platen roller and the endless belt, so that the desired rotational driving force can be reliably transmitted to the platen roller. In addition, it is preferable that the endless belt be one in which a reinforcing material such as a fiber is buried in rubber, and in particular, a belt having small distortion with respect to tensile force is used.
As a result, the platen roller can be accurately rotated by a target rotation amount, and the control accuracy of the rotation amount is improved.

Further, in the present invention, teeth meshing with each other are formed on the endless belt, the pulley of the platen roller, and the drive roller for transmitting the driving force of the platen roller drive source to the endless belt. Such a configuration can also be adopted. As a result, the driving of the platen roller by the driving force supply unit is more accurately and reliably performed. In the driving force supply means, in the process of moving the platen roller to the pressed position, the platen roller is moved while pressing the endless belt by the pulley of the platen roller. The endless belt and the teeth of the pulley are securely engaged with each other until the pressing position is reached.

Further, in the present invention, it is possible to adopt a configuration in which the driving force supply means includes a tension roller for urging and tensioning the endless belt. According to this configuration, when the platen roller is closed, the endless belt comes into pressure contact with the platen roller. Since the platen roller and the endless belt are pressed by the tension roller with a target pressing force, the target rotational driving force is stably transmitted from the driving force supply means to the platen roller via the endless belt. Thereby, the feeding movement of the label paper by the platen roller is stabilized, and the printing quality in the printing unit is improved. In the case where the pulley of the closed platen roller and the tooth of the endless belt are engaged with each other, the pulley comes into contact with the endless belt in the process of closing the platen roller, and then the platen roller reaches the pressed position. By this time, the endless belt and the pulley are moved by the urging force of the tension roller while the pressing contact force between the endless belt and the pulley is secured, whereby the teeth of the pulley of the platen roller and the endless belt are easily engaged with each other.

Further, in the present invention, as described in claim 4, a peeling means for peeling the label from the backing paper after printing,
A feed roller that feeds the backing sheet from which the label has been peeled by the peeling means, the feed roller including a pulley around which the endless belt of the driving force supply means is wound, and which rotates via the endless belt. The driving roller transmits the driving force to rotate the feed roller. The endless belt, which feeds the label paper, is engaged with the pulley of the platen roller and the driving roller for transmitting the driving force of the platen roller driving source to the endless belt. A configuration in which teeth are formed can also be adopted. According to this configuration, since the feed roller and the platen roller are rotationally driven by the same endless belt, the rotations of the feed roller and the platen roller are accurately synchronized. As a result, the feeding movement of the label paper is stabilized, and the printing quality is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a label printer according to the present invention will be described below with reference to FIGS. Reference numeral 1 in FIGS. 1 and 2 denotes a label printer according to the present embodiment. The label printer 1 includes a label printer main body 2 having an appearance box shape, and a cassette 3 that is attached to and detached from the label printer main body 2. That is, the label printer 1 shown in FIG. 2 is configured by attaching the cassette 3 shown in FIG. 4 to the label printer main body 2 shown in FIG.

As shown in FIG. 1, a label printer main body 2
A print head 4 (thermal head), a platen roller 5, and a moving mechanism 6 for moving the platen roller 5 are mounted in the lower portion of FIG. The print head 4 and the platen roller 5 constitute a printing unit that prints on the label paper L supplied from the cassette 3. The print head 4 is swingably supported by a shaft 7 at one side (left side in FIG. 1) of the label printer main body 2 when viewed from the front, and is urged downward by a spring (not shown).

A platen roller 5 is provided on a movable table 8 which can move the lower portion of the label printer main body 2 in the left-right direction (left and right in FIG. 1).
(See FIG. 5), and reciprocates between a press-contact position 9 which is almost in contact with the print head 4 and a standby position 10 which is a central portion of the label printer body 2 in the left-right direction. As shown in FIG. 5, guide members 20a, 20b, and 20c for guiding the movement of the moving table 8 are disposed on both sides of the moving track of the moving table 8, and as shown in FIG.
Guide grooves 12a, 12b, 12
Two guide shafts 11 protruding from the movable base 8 are movably engaged with c. Thereby, the movement of the movable base 8 is smoothly performed. In the vicinity of the print head 4 in the guide grooves 12a and 12b, an engaging portion 13 that is bent in the up-down direction is formed. The engagement portion 13 engages with one of the guide shafts 11 so as to be able to be disengaged from the platen roller 5.
To the target position with respect to. The platen roller 5 is rotatably supported at the end of the movable table 8 on the print head 4 side. A feed roller 14 is attached to the end of the label printer main body 2 opposite to the platen roller 5.

Reference numeral P in FIG. 6 denotes driving force supply means. The driving force supply means P includes an endless belt 15 wound around a platen roller 5, a feed roller 14, and a plurality of rollers 16a, 16b, 16c, and a platen roller driving source 16 for driving the endless belt 15 to rotate. (A platen rotation stepping motor shown in FIG. 7). As shown in FIG. 5, since the endless belt 15 is wound around the pulleys 15a and 15b of the platen roller 5 and the feed roller 14, respectively, the platen roller 5 and the feed roller 14 are simultaneously rotated by being driven to rotate. Rotate. As shown in FIG. 6, the endless belt 15 reaches the press contact position 9 from the standby position 10 via a plurality of rollers 16a, 16a.
Further, from the vicinity of the pressure contact position 9, a drive roller 16 f directly connected to a platen roller drive source 16 above the print head 4 via the rollers 16 b and 16 c reaches the drive roller 16 f.
A substantially L-shaped endless path from f to the feed roller 14 via the roller 16a near the standby position 10 is formed. The pulleys 15 a and 15 b of the platen roller 5 and the feed roller 14 are arranged inside the movement path of the endless belt 15.

FIG. 9 shows a pulley 15a of the platen roller 5.
And the structure of the endless belt 15 are shown. In FIG. 9, the pulley 15a and the endless belt 15 have teeth 15 meshing with each other.
d and 15e. As shown in FIG. 6, the pulley 15 a and the endless belt 15 are separated when the platen roller 5 is at the standby position 10, but when the platen roller 5 is moved to the pressure contact position 9, they are pressed against each other. Teeth 1
5d and 15e are engaged with each other, so that the rotational driving force of the platen roller driving source 16 can be transmitted to the pulley 15a via the endless belt 15. In the process of moving the platen roller 5 from the standby position 10 to the pressure contact position 9, the pulley 15 a moves while pressing the endless belt 15 near the pressure contact position 9 so as to hook the endless belt 15. During the movement of the endless belt 15, a tension roller 16 described later is used.
Since the predetermined tension is continuously applied to the endless belt 15 by d, the pulley 15a and the endless belt 15 are always in pressure contact with each other, and the pulley 15a and the endless belt 15 Are relatively displaced, the pulley 15a and the endless belt 15 have their respective teeth 15d, 1d until the platen roller 5 reaches the pressure contact position 9.
5e are engaged properly, whereby the rotational driving force of the driving force supply means P can be transmitted to the platen roller 5, and the platen roller driving source 16 controls the platen roller 5 to rotate accurately with a desired rotation amount. Can be driven. Each of the pulley 15b and the drive roller 16f of the feed roller 14 has teeth (not shown) that mesh with the teeth 15e of the endless belt 15. In addition, the pulley 15b of these feed rollers 14, the rollers 16a and 16b,
It is preferable that each of the tension roller 16c, the tension roller 16d, and the drive roller 16f be formed of a hard material such as a metal, thereby improving the operation accuracy.

The position of the platen roller drive source 16 in the label printer main body 2 depends on the endless belt 15.
It is free within the arrangement range of. By this, for example, in the conventional configuration in which the gears mesh with each other, the component parts are likely to interfere with the printing unit and easily cause inconvenience in the design,
The driving force supply means P has a high degree of freedom in design, can avoid interference with the printing unit, and can easily combine various devices such as a sticking device near the printing unit in design.

Reference numeral 14a in FIG. 8 denotes a driven roller. The driven roller 14 a is urged in the direction of the feed roller 14, and can normally be fed together with the feed roller 14 with the mount L1 interposed therebetween. When the movable table 8 is located at the standby position 10, the drive table 18 pushes and moves the driven roller 14a to open the space between the movable table 8 and the feed roller 14.

As shown in FIG. 6, the platen roller 5
At the position other than the pressure contact position 9, there is almost no contact with the endless belt 15, so that the belt is not driven to rotate.
As a result, the endless belt 15 disposed so as to cross the movement locus of the platen roller 5 is pressed outward, so that the endless belt 15 is rotated by the rotational driving force transmitted from the endless belt 15. Further, the tension roller 1 urges the endless belt 15 in a direction perpendicular to the rotation direction to apply a constant tension.
6d, the tension applied to the endless belt 15 is kept constant even if the arrangement state of the endless belt 15 is changed by the platen roller 5, so that the label paper L by the platen roller 5 during printing is maintained. Is stable, and the printing quality is improved. Tension roller 16d
Urges the endless belt 15 outward by the urging force of the urging means 16g (spring).

As shown in FIG. 5, the moving mechanism 6 is connected to a ball screw 17 so as to be movable integrally with the moving table 8, and the ball screw 17 is rotated to drive the moving table 8 to reciprocate. A table 18 is provided. The moving mechanism 6 rotates the ball screw 17 with a platen roller moving motor 19 shown in FIG. 2 (a platen moving stepping motor shown in FIG. 7) to reciprocate the moving table 8 and move the platen roller 5 to a target position. Move accurately and stably. In FIG. 5, a space 20d is interposed between the guide members 20b and 20c. When the cassette 3 is mounted, the label paper L is passed through the space 20d so that the space between the print head 4 and the platen roller 5 is provided. It can be located. Reference numeral 5a in FIGS. 1 and 5 denotes a dispenser, which peels off the label L2 printed by the printing unit from the backing paper. Reference numeral 41 in FIG. 5 denotes one of the label position optical sensors including a light emitting element and a light receiving element,
As shown in FIG. 5, the other label position optical sensor 41 disposed near the print head 4 and a pair for detecting the position of the label paper L are formed.

Next, the cassette 3 will be described with reference to FIGS. The cassette 3 includes a cassette main body 31 formed in an external box shape from resin or the like, and a label for winding and storing a long strip-shaped label sheet L in which a label L2 is adhered to a mount L1 inside the cassette main body 31. Paper supply unit 33
And is disposed apart from the label paper supply unit 33,
A mount winding unit 34 (roll) for winding the mount L1 from which the completed label L2 has been removed from the label paper L supplied from the label paper supply unit 33, and a lower portion (FIG. 1, FIG. 2 lower side) of the cassette body 31. Fixed metal housing 35
And As shown in FIG. 2, the label paper supply unit 33 is rotated forward and reverse by a paper supply unit motor 37 (a paper supply unit DC motor shown in FIG. 7) connected via a belt 36. The mount winding section 34 is rotated only in the winding direction by a mount winding motor 38 (see FIG. 6: mount winding DC motor shown in FIG. 7). The housing 35 is in the standby position 1 when the cassette 3 is mounted on the label printer main body 2.
0 is housed.

There are two arrangements of the label paper L in the cassette 3. [First Arrangement Form] As shown in FIG. 1, a label paper L supplied from a label paper supply section 33 is supplied to a housing 35 via a guide projection 40 projecting to the left side of the backing paper winding section 34 in FIG. 1 is drawn out of the cassette main body 31 through an opening 39 opened to the left in FIG. 1, and passes through the lower side of the housing 35 to the opening 39 on the right in FIG.
From the cassette body 31 again, and wound up by the mount winding unit 34. [Second Arrangement Form] The label paper L supplied from the label paper supply section 33 is provided on the housing 35 via a guide projection 40 protruding to the right side of the mount winding section 34 in FIG.
The cassette body 31 passes through an opening 39 opened to the middle right side.
The cassette body 3 is pulled out of the housing 35 through the opening 39 on the left side in FIG.
The sheet is again pulled into the inside 1 and wound up by the mount winding section 34. At this time, in the label printer main body 2, the label L2 can be discharged to the right side in FIG. 1 by mounting the cassette 3 with the configuration of the print head 4, the driven roller 14a and the like reversed right and left. Therefore, in the label printer 1, by selecting the first and second arrangement forms, the right-side issue and the left-side issue of the label L2 can be selected.

In FIG. 1, reference numeral 41 denotes a label position optical sensor, which is disposed between the print head 4 and the moving table 8 and faces when the platen roller 5 is at the pressure contact position 9 and is disposed between them. The label L2 attached to the paper L is detected. The label paper L is a label position optical sensor 41,
Detection is performed based on the intensity of transmitted light from the 41 light emitting elements. Although not shown, optical sensors are also installed at the press-contact position 9 and the standby position 10 of the label printer main body 2, and confirm that the movable table 8 (platen roller 5) is at a predetermined position. An optical sensor is also provided at the position where the cassette 3 is mounted on the label printer main body 2 to confirm that the cassette 3 is mounted at a predetermined position on the label printer main body 2. These optical sensors correspond to a platen roller pressing position optical sensor 56, a plantain roller standby position optical sensor 55, and a cassette mounting optical sensor 54 shown in FIG. In FIG. 1, reference numeral 14 a denotes a driven roller, which interposes the label paper L or the backing sheet L 1 between the feed roller 14 and the driven roller and rotates following the feed roller 14.

FIG. 7 shows a control system of the label printer 1. Reference numeral 42 in FIG. 7 denotes a CPU. This CPU 42
Are connected to a ROM 43, a RAM 44, a liquid crystal display 45, an operation unit 46, a head control unit 47, a communication unit 48, a motor control unit 49, and a sensor interface 50. The operation section 46 is connected with a feed key 51 for adjusting the feed of the label paper L and the sensitivity of the label position detection optical sensor 41 and a cassette removal key 52.
, The control mode of the control system is switched. The print head 4 is connected to the head control unit 47, and the print data input to the console 53 connected to the communication unit 48 is developed into a dot image and output from the print head 4. The motor control unit 49 is connected with the platen roller movement motor 19, the platen roller drive source 16, the paper supply unit motor 37, and the backing paper take-up motor 38.
The drive is controlled based on a command from U42. The sensor interface 50 includes the cassette mounted optical sensor 5
4. Label position optical sensor 41, plantain roller standby position optical sensor 55, platen roller pressing position optical sensor 56
And the detection signals of these optical sensors 54, 41, 55, 56 are transmitted to the CPU 42. The cassette mounted optical sensor 54 detects the cassette 3 correctly mounted on the label printer main body 2. The plantain roller standby position optical sensor 55 and the platen roller pressure contact position optical sensor 56 detect the movable platform 8 at the standby position 10 and the pressure contact position 9.

The operation and effect of the label printer 1 will be described below. In the label printer 1, the cassette 3 is mounted on the label printer main body 2 with the platen roller 5 positioned at the standby position 10 (first step). Thereby, as shown in FIG. 2 and FIG.
The cassette 3 can be easily mounted on the label printer main body 2 without the platen roller 5 entering the inside of the label printer 5 and interfering with the print head 4, thereby improving workability. Then, the cassette mounting optical sensor 54 detects that the cassette 3 has been mounted, and
As shown in FIG. 1, the PU 42 drives the platen roller moving motor 19 to move the platen roller 5 to the pressure contact position 9, sandwich the label paper L between the platen roller 5 and the print head 4, and Printing head 4
(Second step). At this time, the platen roller 5 that has moved from the standby position 10 moves to the press contact position 9 so as to hook the label paper L disposed between the opening 39 on the left side of the housing 35 and the housing 35. In addition, since the paper supply unit motor 37 is free to rotate, the label paper L is pulled out from the label paper supply unit 33 by the movement of the platen roller 5 to the pressure contact position 9 and the length of the paper arrangement path.

The platen roller 5 moves from the standby position 10 to the pressing position 9. Until the pressing position 9 is reached, the platen roller 5 is driven by the guide members 20a, 20b,
0c, it moves stably while being guided by the pressure contact position 9
Is reached, the pulley 15a and the endless belt 15 are correctly engaged. Since the tension of the endless belt 15 is kept constant by the tension roller 16d from when the pulley 15a contacts the endless belt 15 to when the pulley 15a reaches the pressure contact position 9, the platen roller 5
Moves at a constant speed. In addition, the vibration of the endless belt 15 is also suppressed during the movement, and the platen roller 5 moves without vibrating. Therefore, there is no risk that the platen roller 5 that has reached the press contact position 9 will be displaced.

When the movement to the pressure contact position 9 is completed, the platen roller drive source 16 is driven to position the label L2 printing start position in the printing section, and the printer is ready for printing. Next, when print data and a print command are received from the console 53, the platen roller drive source 16 is driven to perform printing while rotating the platen roller 5. The printed label L2 is peeled off from the label sheet L by the dispenser 5a as the label sheet L rotates. Since the rotation driving force of the platen roller 5 is transmitted from the endless belt 15 meshed with the pulley 15a, the platen roller 5 is stably rotated without vibrating. In addition, the amount of rotation of the platen roller 5 is accurately controlled by the control of the platen roller drive source 16. Thereby, the label paper L
The printing accuracy for printing is improved, and the printing quality is improved.

In order to remove the cassette 3 after all the target printing operations on the label paper L have been completed, when the operator presses the cassette removal key 52 (see FIG. 7), the platen roller moving motor 19 is turned in the opposite direction to the above. As shown in FIG. 8, the platen roller 5 is moved to the standby position 10, and the paper supply unit motor 37 is driven to rotate the label paper supply unit 33 in a direction opposite to the previous direction. The label paper L is wound up by an amount corresponding to the shortened paper arrangement path due to the movement of the platen roller 5, and the slack of the label paper L is absorbed (third step). At this time, since the printing unit and the feed roller 14 maintain the stopped state, the absorption of the slack of the label paper L is considered by the label paper supply unit 33. When the winding of the extra label paper L is completed, the cassette 3 is removed from the label printer main body 2. It is also possible to mount another cassette 3 after removing the cassette 3. At this time, since the platen roller 5 is at the standby position 10, the work of mounting the cassette 3 to be newly mounted can be easily performed without paying attention to interference with the platen roller 5.

In each of the first to third steps,
Confirmation of the position of the platen roller 5 at the press contact position 9 and the standby position 10 is performed by the platen roller standby position optical sensor 55 and the platen roller pressure contact position optical sensor 56, and the platen roller 5 is returned to a normal position by these optical sensors 55 and 56. Only when it is confirmed that there is, each step is performed.

According to the label printer 1, the guide members 20a and 20b attached to the label printer
20c is a structure for guiding and moving the moving unit 8;
The guide members 20a, 20b, 20c and the platen roller pressure contact position optical sensor 56 allow the platen roller 5 to be accurately positioned at the pressure contact position 9, so that the positioning accuracy of the platen roller 5 is improved, and printing at the printing unit is performed. Quality is improved. The platen roller 5 is attached to the cassette 3.
Since the cassette 3 need not be mounted, the cassette 3 does not need to be manufactured with high precision, and can be easily manufactured using inexpensive materials. Further, by engaging the teeth 15d and 15e of the platen roller 5 and the endless belt 15 with each other, the rotational driving force of the driving force supply means P is transmitted to the platen roller 5.
, The rotation of the platen roller 5 can be controlled with high accuracy, and the print quality can be improved.

It should be noted that the label printer of the present invention is not limited to the above-described embodiment, but includes a printer with the following modifications. (1) The meshing property between the pulley 15a of the platen roller 5 and the teeth 15d and 15e of the endless belt 15 is ensured by the elasticity of the endless belt 15 without installing the tension roller 16d. (2) A label sticking device and a packaging machine must be installed. (3) Changing the movement path of the platen roller. For example, if the shape of the cassette is changed, the standby position of the platen roller can be set between the label sheet supply section and the mount winding section of the cassette, whereby the entire label printer can be downsized. . (4) The platen roller must be manually moved. Alternatively, the moving mechanism performs only a slight movement or rotation for inserting the label paper. (5) An automatic moving means for automatically moving the platen roller to the pressure contact position when the sensor detects the mounting of the cassette. (6) No automatic cueing means is provided for feeding the label and automatically cueing when the cassette is detected.
To enable automatic cueing by key operation. (7) In order to simplify the alignment between the end of the guide member that guides the platen roller at the press contact position side during the assembly and the press contact position detection sensor of the platen roller, move between the platen roller moving mechanism and the platen roller. Elastic connection. (8) The paper supply unit is not a cassette type. in this case,
It includes a configuration in which all the mechanisms are incorporated in the same unit. (9) The platen roller is built in the cassette. (10) A printer that prints using a type wheel, not a dot printer, must be installed. (11) It must be a mountless label printer. (12) Use an endless belt having no teeth. (13) In addition, the present invention is applicable to various label printers having a printing unit configured to move a platen roller toward and away from a print head.

[0030]

As described above, according to the label printer of the first aspect, the position between the press-contact position where the label paper is sandwiched between the print head and the press-contact and the standby position separated from the press-contact position. In a label printer having a reciprocating platen roller, a configuration in which, when the platen roller moves to a pressure contact position, the endless belt of the driving force supply means is pressed against a pulley attached rotatably to the platen roller to rotate and drive. Therefore, there is no concern that the gears do not mesh with each other as in the conventional configuration, and the platen roller can be reliably driven to rotate,
An excellent effect such as an improvement in printing quality is achieved.

According to the label printer of the second aspect,
Since the endless belt, the pulley of the platen roller, and the driving roller for transmitting the driving force of the platen roller driving source to the endless belt are formed with teeth that mesh with each other, the rotation of the platen roller by the driving force supply unit is further increased. Accurate and reliable, high-precision drive transmission is possible, and print quality is improved. Also, in the process of moving the platen roller to the pressure contact position, the endless belt and the pulley are relatively displaced until the platen roller reaches the pressure contact position while moving by pressing the endless belt by the pulley of the platen roller. Since the mutual teeth are surely meshed with each other, an excellent effect that the rotation driving accuracy of the platen roller can be improved can be achieved.

According to the label printer of the third aspect,
The following excellent effects are achieved by employing a configuration in which the driving force supply means includes a tension roller that urges the endless belt in a direction perpendicular to the rotation direction to tension it. (A) When the platen roller moves to the pressure contact position, the endless belt is securely pressed against the platen roller.
The target rotational driving force is stably transmitted from the driving force supply means to the platen roller, whereby the feeding movement of the label paper by the platen roller is stabilized, and the printing quality in the printing unit is improved. (B) In the process of moving the platen roller to the pressure contact position,
The pressing force between the endless belt and the pulley is ensured by the urging force of the tension roller from the time the pulley abuts on the endless belt to the time the platen roller reaches the pressure contact position. Even if the teeth of the endless belt are meshed with each other, the meshing becomes easy. (C) Since the tension of the endless belt is always kept constant by the tension roller, the rotation of the platen roller during printing is stabilized, and the printing quality is improved.

According to the label printer of the fourth aspect,
The feed roller and the platen roller, on which the label paper is wound between the label paper supply unit and the backing paper winding unit, are driven to rotate by the same endless belt. The rotation of the feed roller and the platen roller is accurately synchronized, and as a result, an excellent effect of stabilizing the feeding movement of the label paper and improving the printing quality is achieved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a label printer of the present invention.

FIG. 2 is a side sectional view of the label printer of FIG.

FIG. 3 is a side sectional view showing a label printer main body of the label printer of FIG. 1;

FIG. 4 is a side sectional view showing a cassette of the label printer of FIG. 1;

FIG. 5 is an enlarged plan view of a main part showing a moving mechanism of the label printer of FIG. 1;

FIG. 6 is a front view showing a drive system of the label printer of FIG.

FIG. 7 is an electric block diagram showing a control system of the label printer of FIG.

FIG. 8 is a front view showing the operation of the label printer of FIG. 1, and shows a third step (elimination of slack in the label paper after printing).

FIG. 9 is an enlarged perspective view of a main part showing a platen roller and an endless belt of the label printer of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Label printer 4 Print head (printing part) 5 Platen roller (printing part) 14 Feed roller 15 Endless belt 15a Pulley 15b Pulley 15d Teeth 15e Teeth 16d Tension roller 16 Platen roller drive source (Platen stepping motor) 33 Label paper supply part L Label paper L1 Mount L2 Label P Driving force supply means

Claims (4)

[Claims] 1. A label paper supply section (33) for supplying a long strip of label paper (L) having a plurality of labels (L2) attached to a mount (L1); a print head (4); In a label printer that sandwiches label paper at a printing unit configured by a platen roller (5) that can be opened and closed with respect to the head, prints the label, and peels off the printed label from the backing paper and supplies it to a predetermined position. A driving force supply unit (P) for supplying a rotational driving force, wherein the driving force supply unit includes a pulley (15a) attached to a platen roller, and an endless shape that is pressed against the pulley when the platen roller is closed. A belt (15), and a platen roller drive source (16) for rotating and driving the endless belt. It is disposed between the platen roller is opened against shaped head, by closing the platen roller, sandwiched between the print head platen roller presses the label sheet, and,
A label printer (1), wherein a platen roller is rotatable by an endless belt pressed against a pulley of the platen roller. 2. A tooth (15d, 15d) meshing with an endless belt, a pulley of a platen roller, and a drive roller for transmitting a driving force of a platen roller drive source to the endless belt.
The label printer according to claim 1, wherein e) is formed. 3. A label printer according to claim 1, wherein said driving force supply means includes a tension roller (16d) for urging and tensioning said endless belt. 4. A printing apparatus comprising: peeling means for peeling a label from a backing sheet after printing; and a feed roller (14) for feeding the backing sheet on which the label has been peeled off by the peeling means. A pulley (15b) around which a belt is wound, wherein a rotational driving force is transmitted through the endless belt to rotate a feed roller, thereby moving the label paper. Item 4. The label printer according to any one of Items 1 to 3.