JP2000108472A - Printing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sagging of an ink ribbon occurring near a supplying core at the finishing of the forward motion of a carriage. SOLUTION: A supplying knob 24 is made axially shiftable on a shaft 241 and a back tension spring 25 is inserted below the supplying knob 24. The pins 331a of a supplying core 33a, amound which a monochromic ink ribbon is wound, engage with an upper stage ratched gear 24a by abutting against the stepped part of the supplying knob 24, resulting in moving the supplying knob 24 downwards and shortening the back tension spring 25. The pins 331b of a supplying core 33b, around which a polychromatic ink ribbon is wound, engage with a low stage ratched gear 24b without abutting against the stepped part of the supplying knob 24, resulting in moving the supplying knob 24 upwards by means of the elastic force of the back tension spring 25 and the back tension spring 25 extends. By the change of the elastic force due to the change of the length of the back tension spring 25, the magnitude of the back tension acting on the supplying knob 24 changes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer for recording an image on recording paper via an ink ribbon contained in a ribbon cassette mounted on a carriage.

[0002]

2. Description of the Related Art An ink ribbon wound around a supply core in a ribbon cassette is taken up from a supply core to a take-up core via a space between a print head and recording paper, and the print head is selectively operated during this time. Printers, such as thermal printers, which transfer the ink applied to the ink ribbon to the surface of the recording paper by driving the ink ribbon. In such a printer device, a carriage on which a ribbon cassette is mounted is reciprocated in a direction orthogonal to a recording paper conveyance direction, and a winding core in the ribbon cassette is rotated while the carriage is moving forward, thereby forming an ink ribbon. While the carriage is moving backward, the rotation of the take-up core is stopped so that the ink ribbon is not pulled out of the supply core.

However, even if the rotation of the take-up core is stopped when the carriage reaches the end in the forward movement direction, the supply core wound with the ink ribbon does not immediately stop rotating due to the action of the inertia force. Then, the supply core stops rotating with a delay from the rotation stop timing of the take-up core, and a larger amount of ink ribbon than the take-up amount of the take-up core is sent out from the supply core. For this reason, the ink ribbon is slackened in the ribbon cassette when the carriage is moved back, and the running state of the ink ribbon or the winding failure is caused at the time of the next forward movement of the carriage, so that the supply state of the ink ribbon becomes unstable, and the image of the image becomes unstable. There is a problem that the image quality is deteriorated such as missing. Further, even if the ink ribbon does not run poorly or does not take up badly during the next forward movement of the carriage, the ink ribbon will be excessively wound up in a range where the ribbon cassette has become loose, and the ink ribbon will not be wound up. There is a problem that the consumption increases and the running cost increases.

Therefore, in a conventional printer, a friction load called back tension is constantly applied to a supply core of a ribbon cassette mounted on a carriage, and the inertial force of the supply core is canceled by the friction load.
The ink ribbon is prevented from becoming loose when the carriage is moved back.

In the configuration disclosed in Japanese Utility Model Laid-Open Publication No. 64-52761, a resistance applying member for applying a running resistance to the ink ribbon is provided on the take-up core side of the print head. Rotating the rotating member through the swing of the swinging member in conjunction with the movement of the head from the printing position to the release position, and transmitting the rotation of the rotating member to the winding core via the friction transmitting member. Thus, there is disclosed a configuration in which the take-up core is excessively rotated when the carriage is moved backward, and the occurrence of slack in the ink ribbon from the resistance applying member to the take-up core via the print head is disclosed. I have.

However, in the conventional printer device in which the back tension is applied to the supply core to cancel the inertial force acting on the supply core when the rotation of the winding core is stopped, There is no consideration that the magnitude of the inertial force acting on the supply core is different in each of a plurality of types of ribbon cassettes in which the winding state of the stored ink ribbon is different from each other,
Regardless of the type of ink ribbon stored in the ribbon cassette, the same back tension was always applied to the supply core, so the appropriate back tension was applied to the supply core depending on the type of ribbon cassette mounted on the carriage. The ink ribbon cannot be actuated, and there is a problem that a running defect or a winding defect of the ink ribbon occurs.

For example, since the ink ribbon for monochrome printing is wound at a higher speed than the ink ribbon for color printing, when the winding core is stopped, the supply core around which the monochrome ink ribbon is wound is colored. Inertia force greater than that of the supply core wound with the ink ribbon. For this reason, if the size of the back tension applied to the supply core is set to match the monochrome ink ribbon, excessive back tension will act on the supply core wound with the color ink ribbon, The ink ribbon does not slack due to excessive rotation of the supply core when the carriage moves back, but the rotation force of the winding core becomes weaker than the back tension during the forward movement of the carriage and the ink ribbon is In some cases, the image cannot be pulled out. In this case, the image quality is deteriorated such as a missing image.

On the other hand, if the magnitude of the back tension applied to the supply core is set in accordance with the color ink ribbon, the back tension for the supply core wound with the monochrome ink ribbon becomes insufficient.
When the carriage is moved back, the supply core is excessively rotated by the inertial force, causing the ink ribbon to loosen in the vicinity of the take-up core.

[0008] The magnitude of the inertial force acting on the supply core when the take-up core stops is also affected by the mass of the supply core including the ink ribbon, and depends on the amount of winding of the ink ribbon in the supply core. Change. Since the amount of winding of the ink ribbon in the supply core decreases as the ink ribbon is used for image formation, the magnitude of the inertial force acting on the supply core changes according to the amount of ink ribbon used. become. Therefore, the above-mentioned problem caused by the mismatch between the magnitude of the inertia force acting on the supply core and the magnitude of the back tension similarly occurs in the same type of ribbon cassette in which the used amount of the ink ribbon is different.

The construction disclosed in Japanese Utility Model Laid-Open Publication No. 64-52761 discloses a structure in which an ink ribbon is moved from a resistance applying member disposed on a supply core side of a print head to a take-up core via the print head. To prevent loosening,
The slack of the ink ribbon in the vicinity of the supply core cannot be prevented.

It is an object of the present invention to apply a back tension to a supply core according to a winding state of an ink ribbon stored in each of a plurality of types of ribbon cassettes. It is possible to reliably prevent the ink ribbon from being loosened near the supply core at the end of the forward movement of the ink ribbon.
Another object of the present invention is to provide a printer device capable of always maintaining good image quality without causing poor winding of the ink ribbon due to the rotation force of the winding core becoming weaker than the back tension.

Another object of the present invention is to reduce the magnitude of the inertial force acting on the supply core by reversing the supply core when the carriage moves backward by an amount corresponding to the winding amount of the ink ribbon in the supply core. It is an object of the present invention to provide a printer device that can reliably prevent the ink ribbon from being loosened in the vicinity of the supply core even when the amount of winding of the ink ribbon in the supply core changes depending on the amount of winding.

[0012]

According to a first aspect of the present invention, there is provided a supply core and a take-up knob which respectively engage with a supply core and a take-up core rotatably supported in a ribbon cassette. In a printer device in which a take-up core is rotated through a take-up knob, and the ink ribbon wound around the supply core is wound around the take-up core through a space between the print head and the recording paper, the supply knob is A plurality of types of ribbon cassettes having different winding states of the ink ribbons to be housed therein, the different types of ribbon cassettes being engaged with the supply core in different engagement states, and different loads being supplied in accordance with the engagement states of the engagement structures. And a load member acting on the knob.

According to the first aspect of the present invention, the supply knob is engaged in a different engagement state with each of a plurality of supply cores each wound with a plurality of types of ink ribbons wound in different states. Then, a load in a different state acts on the supply core depending on the engagement state with the supply core. Therefore, when the inertia force acting on the supply core changes when the winding core stops due to a change in the winding state of the ink ribbon, a load corresponding to the inertia force acting on the supply core is supplied via the supply knob. Acting on the core, the supply core is not excessively rotated by the inertia force after the winding core is stopped.

According to a second aspect of the present invention, the engagement structure comprises a supply knob, a supply core of a plurality of types of ribbon cassettes having different winding states of the ink ribbons to be housed therein, and a supply knob in a different vertical direction. It is characterized by engaging at a position.

According to the second aspect of the invention, the vertical position of the supply knob engaged with the supply core changes according to the winding state of the ink ribbon wound around the supply core. Therefore, by providing a load member that applies a load corresponding to the vertical position of the supply knob to the supply knob, a load corresponding to the winding state of the wound ink ribbon acts on the supply core via the supply knob. Since the load corresponding to the inertial force when the winding core stops rotating acts on the supply core, the supply core does not rotate excessively due to the inertial force after the winding core stops.

According to a third aspect of the present invention, the engagement structure is configured so that the supply knob has a plurality of upper and lower engagement portions having different outer diameters from each other and a winding state of the ink ribbon wound around the supply core. And engaging pins having different lengths.

According to the third aspect of the invention, the length of each of the plurality of upper and lower engaging portions having different outer diameters in the supply knob is determined according to the winding state of the ink ribbon wound around the supply core. Each of the different engagement pins engage. Therefore, by setting the positions of the engagement pins in the plurality of types of supply cores to be the same, the vertical position of the supply knob changes according to the winding state of the ink ribbon wound around the supply core, and the vertical direction of the supply knob is changed. By providing a load member for applying a load corresponding to the position to the supply knob, a load corresponding to the winding state of the wound ink ribbon acts on the supply core via the supply knob, and the winding core rotates. The load corresponding to the inertia force at the time of stopping acts on the supply core,
After the take-up core is stopped, the supply core does not rotate excessively due to the inertial force.

The invention described in claim 4 is characterized in that the load member is an elastic member that applies a different load to the supply knob according to the vertical position of the supply knob.

According to the fourth aspect of the present invention, different loads act on the supply knob from the elastic member in accordance with the vertical position of the supply knob. Therefore, when the vertical position of the supply knob changes according to the winding state of the ink ribbon wound around the supply core, a load corresponding to the winding state of the ink ribbon wound around the supply core is applied to the supply knob. Since the load acts on the supply core according to the inertial force when the winding core stops rotating, the supply core does not rotate excessively due to the inertial force after the winding core stops.

According to a fifth aspect of the present invention, there is provided a supply knob and a take-up knob which are respectively engaged with a supply core and a take-up core rotatably supported in a ribbon cassette, and the supply knob and the take-up knob are wound through the take-up knob. In a printer device in which a take-up core is rotated and an ink ribbon wound around a supply core is wound around a take-up core via a space between a print head and recording paper, after the take-up knob stops rotating, A reversing means for rotating the supply knob in a direction opposite to a direction in which the ink ribbon is drawn out at a predetermined time.

According to the fifth aspect of the present invention, the supply knob is rotated in a predetermined time after the rotation of the winding knob is stopped. Therefore, immediately after the winding knob stops rotating, the ink ribbon excessively fed from the supply core due to the rotation of the supply core due to the inertial force is taken up by the supply core that rotates in the reverse direction.

The invention described in claim 6 is characterized in that the reversing means includes means for transmitting a driving force for reversing the supply knob from a driving system for moving the print head between the printing position and the release position. And

In the invention described in claim 6, the supply knob and the supply core are reversed by the driving force transmitted from the driving system provided for moving the print head. Therefore, it is not necessary to provide a separate drive system only to reverse the supply knob.

According to a seventh aspect of the present invention, there is provided a winding amount detecting means for detecting a winding amount of the ink ribbon in the supply core, and the reverse rotation means is provided with a supply knob based on a detection result of the winding amount detecting means. Is selectively reversed.

In the present invention, the supply knob and the supply core are selectively reversed in accordance with the winding amount of the ink ribbon in the supply core. Therefore, the supply core reverses only when the winding amount of the ink ribbon in the supply core is relatively large and the inertia force when the take-up core stops is large, and the winding amount of the ink ribbon in the supply core is relatively small. When the inertia force when the take-up core is stopped is small, the supply core is prevented from rotating in the reverse direction, and only the ink ribbon excessively sent from the supply core can be reliably rewound.

According to an eighth aspect of the present invention, there is provided a rotating speed detecting means for detecting a rotating speed of the supply core when the winding core is rotating, and the reverse rotating means supplies the rotation based on a detection result of the rotating speed detecting means. The knob is selectively reversed.

In the invention described in claim 8, the supply knob and the supply core are selectively reversed according to the rotation speed of the supply core when the ink ribbon is wound on the take-up core. Therefore, the supply core rotates only when the rotational speed of the supply core is relatively slow and the inertia force when the take-up core is stopped is large because the amount of winding of the ink ribbon is large, and the rotational speed of the supply core is relatively small. If the inertia force when the take-up core stops is small because the amount of winding of the ink ribbon is small quickly, the supply core is prevented from reversing, and only the excess ink ribbon sent from the supply core is reliably rewound. be able to.

[0028]

FIG. 1 is a plan view showing a configuration of a thermal printer unit to which the present invention is applied. The printer unit 11 includes a platen 16 arranged in a direction orthogonal to the direction in which the recording paper conveyed by the rotation of the feed roller 15 is conveyed. The rotation of a motor 19 is transmitted to a carriage 21 having a print head 23 facing the platen 16 via a belt 17 stretched over a pulley, and the carriage 21 reciprocates in the directions of arrows A and B along the platen 16. I do. The ribbon cassette 31 is mounted on the carriage 21. The supply core 33 and the take-up core 37 of the ribbon cassette 31 mounted on the carriage 21 are connected to the supply knob 24 provided on the carriage 21.
And the winding knob 26 is engaged.

FIG. 2 is a diagram showing an internal state of the ribbon cassette mounted on the carriage of the printer unit according to the first embodiment of the present invention. FIG. 2A shows the internal state of the ribbon cassette when the carriage moves forward, and FIG. 2B shows the internal state of the ribbon cassette when the carriage moves backward. The ink ribbon 32 wound around the supply core 33 and housed in the ribbon cassette 31 mounted on the carriage 21 as described above,
The print head 23 is guided by the plurality of guide rollers 36 and
And the recording paper P, and is wound around the winding core 37. A frictional load is applied to the ink ribbon 32 pulled out from the supply core 33 by contact with the felt 351 attached to the tip of the leaf spring 352. Further, at a substantially intermediate position between the supply core 33 and the take-up core 37, the leading end of a leaf spring 38 is in contact with the ink ribbon 32. Supply core 33 rotatable in ribbon cassette 31
The supply knob 24 and the winding knob 26 supported by the carriage 21 are fitted and engaged with the winding core 37.

While the carriage 21 moves in the direction of the arrow A shown in FIG. 1, the print head 23 mounted on the carriage 21 moves between the platen 16 and the recording paper as shown in FIG. P and the ink ribbon 32 have been moved to the printing position, and a rotational force in the direction of arrow C is supplied to the winding knob 26.
And rotates in the direction of arrow C. The rotation of the winding core 37 causes the ink ribbon 32 wound around the supply core 33 to be rotated.
Is pulled out from the supply core 33 and wound up by the winding core 37 while being pressed against the surface of the recording paper P. When the ink ribbon 32 is pulled out, the supply core 33 rotates together with the supply knob 24 in the direction of arrow D. In this state, the print head 23 is driven based on the image data, and the portion of the ink ribbon 32 facing the image is selectively heated, whereby the ink applied to that portion is melted and the recording paper P Transferred to the surface.

While the carriage 21 moves back in the direction of arrow B shown in FIG. 1, the print head 23 retreats to a release position separated from the recording paper P and the platen 16, as shown in FIG. At the same time, the supply of the rotational force to the winding knob 26 is stopped, and the winding core 37 also stops rotating in the arrow C direction. This prevents the ink ribbon 32 from being pulled out of the supply core 33. When the print head 23 moves from the print position to the release position, the excess ink ribbon 32 in the vicinity of the print head 23 is taken up by the take-up core 37 that stops rotating after the carriage 21 retreats to the release position. With
The sheet is stored in the ribbon cassette 31 without slack due to the elastic force of the leaf spring 38. On the other hand, the carriage 21
When the winding core 37 stops and the ink ribbon 32 stops, an arrow D is applied to the supply core 33 that has been rotated by the ink ribbon 32 being pulled out by the winding core 37 during the forward movement of the ink ribbon 32.
Directional inertial force acts. For this reason, in a state where sufficient back tension is not acting on the supply core 37 or the supply knob 24, even if the winding core 37 stops, the supply core 37 continues to rotate in the arrow D direction, and The ink ribbon becomes loose. Therefore, the carriage 2
1, a back tension spring for applying a back tension to the supply knob 24 is provided.

FIG. 3 is an external view showing the shape of a supply knob provided on the carriage of the printer unit. The supply knob 24 that engages with the supply core 33 in the ribbon cassette 31 mounted on the carriage 21 is constituted by upper and lower two-stage claw gears 24a and 24b. The claw gear 24a and the claw gear 24b have different outer diameters and different numbers of teeth. The upper pawl gear 24a has three pawl teeth, and has a smaller diameter than the lower pawl gear 24b having six pawl teeth. Therefore, the upper claw gear 24a
A step is formed between the lower gear and the lower claw gear 24b. The upper claw gear 24a corresponds to a ribbon cassette 31 containing a monochrome or monocolor ink ribbon,
The lower claw gear 24b corresponds to the ribbon cassette 31 storing the color ink ribbon.

FIG. 4 is a partially cutaway view showing the shape of the supply core of the ribbon cassette used in the printer unit. FIG. 4A is a partially cutaway view of a supply core 33a around which a monochrome or monocolor ink ribbon is wound.
FIG. 4B is a partially cutaway view of the supply core 33b around which the color ink ribbon is wound. The supply cores 33a and 33b around which the unused ink ribbon 32 is wound in the ribbon cassette 31 have a plurality of pins 331a and 33 on the inner peripheral surface.
1b has a hollow cylindrical shape protruding. When the ribbon cassette 31 is mounted on the carriage 21,
Is fitted into the inside of the supply cores 33a and 33b in the ribbon cassette 31 from below.
At this time, the pins 331a, 3 of the supply cores 33a, 33b
31b meshes with the claw teeth of the claw gear 24a or 24b of the supply knob 24.

In the inner peripheral surface of the supply core 33a and the supply core 33b, the position where the pin 331a is formed matches the position where the pin 331b is formed.

The pin 331a of the supply core 33a around which the monochrome or monocolor ink ribbon is wound is the same as the pin 331 of the supply core 33b around which the color ink ribbon is wound.
It is longer than b. Therefore, when the ribbon cassette 31 containing the monochrome or monocolor ink ribbon is mounted on the carriage 21, the pin 331 a of the supply core 33 a meshes with the upper claw gear 24 a of the supply knob 24. When the ribbon cassette 31 containing the color ink ribbon is mounted on the carriage 21, the pin 331 b of the supply core 33 b meshes with the lower claw gear 24 b of the supply knob 24.

FIG. 5 is a sectional view showing a state where the ribbon cassette is mounted on the carriage in the printer unit. FIG. 5A is a cross-sectional view showing a state in which a ribbon cassette 31a containing a monochrome or monocolor ink ribbon is mounted on the carriage 21.
FIG. 4B is a cross-sectional view showing a state where the ribbon cassette 31b containing the color ink ribbon is mounted on the carriage 21.

In the printer unit 11, a supply knob 24 is supported on the carriage 21 via a shaft 241. The supply knob 24 is movable over a predetermined range in the longitudinal direction of the shaft 241. Also, the supply knob 24
A back tension spring 25 is inserted between a lower surface of the carriage 21 and an upper surface of the carriage 21. The back tension spring 25 is a cylindrical coil spring, and applies a back tension to the supply knob 24 by the elastic force of the shaft 241 in the axial direction. As described above, the supply knob 24 is vertically movable along the axis 241, and the lower surface of the supply knob 24 and the carriage 2 are moved in accordance with the position of the supply knob 24 in the vertical direction.
The distance between the back tension spring 25 and the upper surface of the back tension spring 25 changes. Due to the change in the length of the back tension spring 25, the elastic force of the back tension spring 25 also changes, and the magnitude of the back tension acting on the supply knob 24 changes.

When a ribbon cassette 31a containing monochrome or monocolor ink ribbons is mounted on the carriage 21, the pins 331a of the supply core 33a abut on the step of the supply knob 24 as shown in FIG. It meshes with the upper claw gear 24a. The supply knob 24 is moved downward by the contact between the pin 331a and the step, and the supply knob 2
The back tension spring 25 located between the lower surface of the carriage 4 and the upper surface of the carriage 21 is shortened, and a relatively large back tension acts on the supply knob 24.

On the other hand, when the ribbon cassette 31b containing the color ink ribbon is mounted on the carriage 21, as shown in FIG.
Meshes with the lower claw gear 24b without contacting the step portion of the supply knob 24. For this reason, the supply knob 24 is
The supply knob 24 is moved upward by the elastic force of the back tension spring 25 without being pressed downward by 31b, and the back tension spring 25 located between the lower surface of the supply knob 24 and the upper surface of the carriage 21 is extended. As a result, a relatively small back tension acts on the supply knob 24.

As described above, the supply core 33a is provided for the case where the ribbon cassette 31a containing the monochrome or monocolor ink ribbon is mounted on the carriage 21 and the case where it is mounted on the ribbon cassette 31b containing the color ink ribbon. , 33b of the feed knob 24 with the upper claw gear 24a or the lower claw gear 2
4b to selectively change the position of the supply knob 24 in the up-down direction so that the back tension spring 25
The magnitude of the back tension acting on the supply knob 24 can be changed.

That is, when a ribbon cassette 31a containing a monochrome or monocolor ink ribbon drawn out at a relatively high speed is used, a relatively large back tension is applied to the supply core 33a via the supply knob 24, and the comparison is made. When a ribbon cassette 33b containing a color ink ribbon pulled out at a very low speed is used, a relatively small back tension can be applied to the supply core 33b via the supply knob 24. by this,
The back tension according to the magnitude of the inertial force that changes according to the rotation speed can be applied to each of the supply cores 33a and 33b.

FIG. 6 is a view showing another example of the shapes of the supply core of the ribbon cassette and the supply knob of the carriage used in the printer unit. In this example, FIG.
The length in the vertical direction of the supply pin 331a of the supply core 33a around which the monochrome or monocolor ink ribbon shown in FIG. 6A is wound is determined by the supply core around which the color ink ribbon shown in FIG. 6B is wound. The length of the supply pin 33b is longer than the length of the supply pin 331b in the vertical direction. Along with this,
As shown in FIG. 6C, the supply knob 2 of the carriage 21
4 is formed with a one-step claw gear 24a having a step at the lower end.

According to this configuration, the supply knob 24 is supplied to the supply knob 24 when the ribbon cassette 31a containing the monochrome or monocolor ink ribbon is mounted on the carriage 21 and when the ribbon cassette 31b containing the color ink ribbon is mounted. Core 33a and supply core 3
3b, and by changing the length of the back tension spring 25 by changing the vertical position of the supply knob 24, the supply core 33a and the supply core 33b are respectively adjusted according to the speed at which the ink ribbon is pulled out. Supply the back tension suitable for the inertia force acting on the core 33a
And the supply core 33b.

FIG. 7 is a view showing still another example of the shapes of the supply core of the ribbon cassette and the supply knob of the carriage used in the printer unit. In this example, the circumferential length of the supply pin 331a of the supply core 33a around which the monochrome or monocolor ink ribbon shown in FIG. 7A is wound (in the circumferential direction of the inner peripheral surface of the supply core 33a). 7B) is the circumferential length of the supply pin 331b of the supply core 33b around which the color ink ribbon shown in FIG. 7B is wound (the circumferential length of the inner peripheral surface of the supply core 33b). ) Compared to longer. Accordingly, as shown in FIG. 7C, two kinds of claw gears 24a and 24b having different heights are alternately formed on the supply knob 24 of the carriage 21.

With this configuration, the supply to the supply knob 24 is performed when the ribbon cassette 31a containing the monochrome or monocolor ink ribbon is mounted on the carriage 21 and when the ribbon cassette 31b containing the color ink ribbon is mounted on the carriage 21. Core 33a and supply core 3
3b, and the length of the back tension spring 25 by changing the vertical position of the supply knob 24 to change the length of the back tension spring 25. Supply the back tension suitable for the inertia force acting on the core 33a
And the supply core 33b.

In consideration of the fact that the ribbon cassette may be mounted on the carriage 21 with its front and back surfaces reversed, the supply core 33 may be used in any of the above-described examples.
It is desirable that the shapes of a and 33b be symmetrical in the vertical direction.

In general, the ribbon cassette 31a (3
In 1b), there is provided a gap in which the supply core 33a (33b) can move up and down by a predetermined amount in order to smoothly rotate the supply core 33a (33b). For this reason,
The back tension applied to the supply core 33a (33b) from the back tension spring 25 via the supply knob 24 moves the supply core 33a (33b) upward.
Therefore, the vertical width of the ink ribbon 32 is determined by the vertical print width of the print head 23 and the ribbon cassette 31a (31).
b) is larger than the sum of the gaps provided therein, so that the back tension is applied so that the ink ribbon 32
Can be prevented from facing each other.

Further, in any of the above examples,
The supply core 33a (33) is provided via a supply knob 24 from a back tension spring 25 disposed between the lower surface of the supply knob 24, which is movable vertically, and the upper surface of the carriage 21.
Although the back tension is applied to b), the back tension spring stored in the ribbon cassette 31a (31b) may act on the supply core 33a (33b) according to the inertial force. Good.

For example, as shown in FIGS. 8A and 8B, the back tension spring 251 housed in the ribbon cassette 31a (31bb) at a position facing the center of the supply core 33a (33b). Supply core 33a (33) via 252a (252b).
A back tension having a magnitude corresponding to the inertia force is applied to b). Therefore, the back tension core 252a provided in the ribbon cassette 31a storing the monochrome or mono-color ink ribbon and the back tension core 252b provided in the ribbon cassette 31b storing the color ink ribbon are supported by the carriage 21. The vertical position of the supply shaft 221 in contact with the upper surface of the supply shaft 221,
The length of the back tension spring 251 is changed.

That is, in the ribbon cassette 31a containing monochrome or monocolor ink ribbons, FIG.
As shown in FIG. 8A, the contact portion of the back tension core 252a with the upper surface of the supply shaft 221 is formed to be convex downward, while in the ribbon cassette 31b storing the color ink ribbon, FIG. As shown in (5), the contact portion of the back tension core 252b with the upper surface of the supply shaft 221 is formed flat. The supply core 33a
And the supply core 33b have the same shape, and the back tension cores 252a and 252b are
3b is vertically movable with respect to 3b and is engaged in the circumferential direction.

With the configuration shown in FIGS. 8A and 8B,
The back tension acting on the supply core 33b wound with the color ink ribbon can be applied to the supply core 33a wound with the monochrome or mono-color ink ribbon.

The back tension core 252a (252b) may be formed integrally with the supply core 33a (33b). The back tension core 252a and the back tension core 252b have the same shape, and the back tension core 252a and the back tension core 252b have the same shape. The back tension spring 251 having a different elastic force from the ribbon cassette 31b may be stored.

In each of the above-described examples, a case has been described in which two types of ribbon cassettes accommodating ink ribbons having different winding states are used. However, the shapes of the supply knob, the supply core, and the back tension core are changed. By appropriately changing the present invention, the present invention can be similarly applied to a case where three or more types of ribbon cassettes containing ink ribbons having different winding states are used.

FIGS. 9 to 11 are plan views showing the structure and operation of the carriage in the printer unit according to the second embodiment of the present invention. The carriage 21 of the printer unit according to this embodiment is provided with a lever 22, an intermediate gear 25, a cam gear 27, and a motor 29 in addition to the print head 23, the supply knob 24, and the take-up knob 26. The cam gear 27 is configured by integrally stacking a cam 271, a cam 272, and a gear 273 in the vertical direction.
The peripheral surface of the cam 271 contacts a part of the head holder 231 on which the print head 23 is mounted. The peripheral surface of the cam 272 is
It contacts one end of the lever 22. The gear 273 is a motor 2
9 meshes with the motor gear 291 and the intermediate gear 25 fixed to the rotating shaft. The cam gear 27 rotates by receiving the transmission of the rotation of the motor 29 by the engagement of the gear 273 and the motor gear 291.

At the time of the printing operation in which the carriage 21 moves forward, as shown in FIG. 9, while the peripheral surface of the large diameter portion of the cam 271 contacts a part of the head holder 231, the head holder 231 is Spring 232 with 23
Rotates in the direction of arrow E against the elastic force of
Is a sheet P and an ink ribbon 32 between the platen 16 and
(Not shown) is exposed at the holding position. On the other hand, during a non-printing operation in which the carriage 21 moves backward,
As shown in FIG. 11, while the peripheral surface of the small-diameter portion of the cam 271 contacts a part of the head holder 231, the head holder 231 is urged in the direction of arrow F by the elastic force of the spring 232 together with the print head 23. The print head 23 retreats to a release position separated from the platen 16.

The lever 22 has a substantially L-shape, and has one end in contact with the peripheral surface of the cam 272 as described above.
A switching gear 222 meshing with each other is provided at an intermediate portion of the lever 22.
The switching gear 223 is supported by a shaft, and the lever 22 is rotatable about the rotation axis of the switching gear 223.
The lever 22 is urged in the direction of arrow G by the elastic force of the spring 225 locked at the other end, and the peripheral surface of the small diameter portion of the cam 272 is in contact with one end during the printing operation shown in FIG. In the meantime, the switching gear 222 meshes with the winding gear 261 fixed to the winding knob 26. On the other hand, during the non-printing operation shown in FIG.
The lever 22 rotates in the direction of arrow H against the elastic force of the spring 225 while the peripheral surface of the large diameter portion of
The switching gear 222 does not mesh with the winding gear 261.

The carriage 21 is provided with a drive gear 224 that always meshes with the belt 18. Drive gear 22
4 rotates in both forward and reverse directions with the reciprocation of the carriage 21. The switching gear 223 is always meshed with the drive gear 224. Therefore, during the forward movement of the carriage 21 during the printing operation shown in FIG. 9, when the peripheral surface of the small diameter portion of the cam 272 is in contact with one end of the lever 22, the forward rotation of the drive gear 224 is switched to the switching gear 223. The rotation is transmitted to the winding gear 261 via the switching gear 222, and the winding knob 26 rotates in a direction in which the ink ribbon 32 is wound. On the other hand, when the peripheral surface of the large diameter portion of the cam 272 is in contact with one end of the lever 22 while the carriage 21 moves backward during the non-printing operation shown in FIG. Since the power is not transmitted from the 222 to the winding gear 261, the winding knob 26 stops rotating.

The intermediate gear 25 has the same diameter and the same number of teeth as the gear 273, and an intermittent gear 252 having a gear formed only on a part of the circumference is fixed so as to match the rotation axis.
When the carriage 21 reaches the end in the forward movement direction, the intermittent gear 252 starts to mesh with the reverse rotation gear 242 fixed to the supply knob 24 as shown in FIG. The rotation of the motor 29 is transmitted to the intermediate gear 25 via the motor gear 291 and the gear 273, and the intermittent gear 252 also rotates together with the intermediate gear 25, but a part of the intermittent gear 252 during one rotation of the intermediate gear 25 and the intermittent gear 252. The rotation is transmitted to the reverse rotation gear 242 only during the meshing operation. Therefore, the supply knob 24 rotates in a direction opposite to the rotation direction when the ink ribbon is pulled out together with the reverse rotation gear 242 by a predetermined amount after the carriage 21 reaches the end of the forward movement direction and the printing operation is completed. The motor 29
Is constantly driven during the reciprocation of the carriage 21.

With the above-described configuration, in the printer unit according to this embodiment, the supply knob 24 is rotated backward by a predetermined amount immediately after the printing operation is completed and the winding of the ink ribbon 32 is stopped. When the take-up stops, the ink ribbon 32 excessively drawn out by the inertial force acting on the supply core 33 can be rewound to the supply core 33.

As shown in FIG. 10, the intermittent gear 25
2 is engaged with the reverse gear 242 and the supply knob 24 is rotating in reverse, the peripheral surface of the large diameter portion of the cam 213 is in contact with a part of the head holder 231, so that the ink ribbon 32 Along with P, it is kept sandwiched between the print head 23 and the platen 16. The reverse gear 242 is fixed to the supply knob 24 via a friction clutch 243. This friction clutch 243
Is larger than the rotational force of the supply core 33 necessary for rewinding the ink ribbon 32 drawn out excessively,
An ink ribbon 32 is formed from the print head 23 and the platen 16.
Is smaller than the frictional force acting on

Therefore, after the rewinding of the ink ribbon 32 excessively drawn from the supply core 33 due to the reverse rotation of the supply gear 24 is completed, the movement of the ink ribbon 32 in the direction of the supply core 33 causes the print head 23 and the platen 16 to move. When a load acts on the reverse rotation of the supply knob 24 due to this restriction, a slip occurs between the reverse rotation gear 242 and the supply knob 24 in the friction clutch 243, and the reverse rotation of the supply knob 24 stops. . As a result, the range of the ink ribbon 32 passing through the position facing the print head 23 is changed to the supply core 33 of the print head 23.
It will not be rewound to the side.

As a result, when the winding of the ink ribbon 32 is stopped, the supply core 33 rotates excessively in accordance with the magnitude of the inertia force acting on the supply core 33, and the magnitude of the inertia force near the supply core 33 increases. When the ink ribbon is slackened correspondingly, only the slackened ink ribbon 32 can be rewound to the supply core 33 irrespective of the magnitude of the inertial force applied to the supply core 33.

FIGS. 12 to 14 are views showing the configuration and operation of another example of the carriage provided in the printer unit according to the second embodiment. The carriage according to this example includes a cam gear 41 instead of the cam gear 27 in the configuration of the carriage shown in FIGS. 9 to 11, and a rewind lever 42 and a rewind roller gear 45 instead of the intermediate gear 25.
An idler roller gear 46 and a reverse drive roller gear 47 are provided. The cam gear 41 includes a cam 411 in addition to the cam 271, the cam 272, and the gear 273 of the cam gear 27 in the carriage configuration shown in FIGS. 9 to 11. These cams and gears are integrally laminated in the vertical direction. It is configured. The cam 411 abuts one end of the rewind lever 42 on the peripheral surface.

The rewind lever 42 is rotatable about the rotation axis of the supply knob 24 and the reversing gear 242 at an intermediate portion, and has one end in contact with the peripheral surface of the cam 411 and a spring 422 near the other end. Is locked. The reverse drive roller gear 47 includes a roller portion 471
, The rotational force is supplied from the belt 18 and the gear unit 4
At 72, it meshes with the gear portion 461 of the idler roller gear 46. Roller portion 462 of idler roller gear 46
Selectively presses against the roller portion 451 of the rewind roller gear 45 pivotally supported by the other end of the rewind lever 42. The gear portion 452 of the rewind roller gear 45 is
2 always meshes.

In the above configuration, while the carriage 21 is moving forward during the printing operation, as shown in FIG.
One end of the rewind lever 42 contacts the peripheral surface of the small diameter portion of the cam 411, and the rewind lever 42 is urged in the direction of arrow I by the elastic force of the spring 422. The roller portion 451 of the rewind roller gear 45 is the roller portion 4 of the idler roller gear 46.
No contact with 62. Therefore, during the printing operation in which the carriage 21 moves forward, the rotation of the reverse drive roller gear 47 is not transmitted to the reverse rotation gear 242. During this printing operation, the peripheral surface of the small-diameter portion of the cam 272 contacts one end of the lever 22, and the forward rotation of the drive gear 224 causes the switching gear 223 to rotate.
The rotation is transmitted to the take-up gear 261 via the switching gear 222, and the take-up knob 26 is rotated in a direction for winding the ink ribbon.

On the other hand, when the carriage 21 starts moving backward during the non-printing operation, one end of the rewind lever 42 contacts the peripheral surface of the large diameter portion of the cam 411 as shown in FIG. The rewind lever 42 rotates in the arrow J direction against the elastic force of the spring 422. As a result, the rewind roller gear 4 pivotally supported by the other end of the rewind lever 42
5, the roller portion 451 abuts against the roller portion 462 of the idler roller gear 46, the rotation of the reverse drive roller gear 47 is transmitted to the reverse rotation gear 242 via the idler roller gear 46 and the rewind roller gear 45, and the supply knob 24 rotates in the reverse direction. .

Thereafter, when the carriage 21 continues to move backward during the non-printing operation, one end of the rewind lever 42 comes into contact with the peripheral surface of the small diameter portion of the cam 422 as shown in FIG. It is urged again in the direction of arrow I by the elastic force of the spring 422. As a result, the roller portion 451 of the rewind roller gear 45 is
6 does not come into contact with the roller portion 462, and the rotation of the reverse drive roller gear 47 is not transmitted to the reverse rotation gear 242.

As described above, immediately after the carriage 21 starts to return, the cam 4
Only while the large diameter portion 11 is in contact, the supply knob 24 is reversed, and the supply core 33 is rotated by inertial force, whereby the excess ink ribbon 32 sent out from the supply core 33 is rewound to the supply core 33.

In the structure shown in FIGS. 12 to 14, a friction clutch is provided between the supply knob 24 and the reverse gear 242 in the same manner as the structure shown in FIGS. Ink ribbon 32 with slack
It is also possible to prevent more ink ribbons 32 from being rewound to the supply core 33.

Further, in the configuration shown in FIGS. 9 to 11 and the configuration shown in FIGS.
A winding amount detecting means for detecting a winding amount of the ink ribbon 32 in the supply core 33 of the supply core 33, and based on a detection result of the winding amount detecting means, the supply knob 24 is selectively reversely rotated. The ink ribbon 32 may be rewound only when a relatively large inertia force acts on the supply core 33 while a large amount of the ink ribbon is wound around the ink ribbon 33.

The winding amount detecting means is disposed at a predetermined position on the carriage 21 facing the ink ribbon 32 wound around the supply core 33 in the ribbon cassette 31, as shown in FIG. 15, for example. A photosensor 291 including a light emitting element and a light receiving element can be used. In this case, a hole is formed in a portion of the ribbon cassette 31 facing the photosensor 291, and a reflection member 295 is attached to a portion of the lower surface of the cover 102 of the printer device 11 facing the photosensor 291. .

In this configuration, when a large amount of the ink ribbon 32 is wound around the supply core 33, the light emitted from the light emitting element of the photosensor 291 is absorbed by the ink ribbon 32 and the light received by the photosensor 291 is received. The element does not receive the reflected light of the light emitting element. On the other hand, the supply core 33
When the winding amount of the ink ribbon 32 is reduced to a predetermined amount or less, light emitted from the light projecting element of the photo sensor 291 is reflected by the reflecting member 295 of the cover 102, and the light receiving element of the photo sensor 291 is reflected by the reflecting member. The reflected light at 295 is received.

The irradiation of the light from the light emitting element in the photo sensor 291 and the output of the light receiving signal from the light receiving element can be executed at any timing during the reciprocating operation of the carriage 21.

In this manner, the winding amount of the ink ribbon 32 in the supply core 33 can be detected based on the amount of light received by the light receiving element in the photo sensor 291.
Therefore, in a state where the light receiving element of the photo sensor 291 does not receive the reflected light of the light emitted from the light projecting element and a relatively large amount of the ink ribbon 32 is wound around the supply core 33, the motor 29 is set to 360. 9 degrees by rotating
11 to 11, a part of the intermittent gear 252 is meshed with the reverse gear 242, or the peripheral surface of the large diameter portion of the cam 422 is brought into contact with one end of the rewind lever 42 in the configurations of FIGS. The feed knob 24 is reversed during operation. On the other hand, when the light receiving element of the photo sensor 291 receives the reflected light of the light emitted from the light emitting element and the winding amount of the ink ribbon 32 of the supply core 33 is relatively small, the motor 29 is rotated by 180 degrees. 9 to 11 so that a part of the intermittent gear 252 does not mesh with the reverse gear 242 in the configuration of FIGS. 9 to 11, or the cam 422 is attached to one end of the rewind lever 42 in the configuration of FIGS. The peripheral surface of the large-diameter portion is prevented from abutting, and the supply knob 24 is not reversed even during the non-printing operation.

As a result, the magnitude of the inertial force acting on the supply core 33 immediately after the take-up core 37 stops rotating changes according to the amount of winding of the ink ribbon 32 around the supply core 33, When the amount of the ink ribbon 32 sent out excessively from the ink core 32 changes, the amount of winding of the ink ribbon 32 in the supply core 33 is large, and the inertia force acting on the supply core 33 immediately after the winding core 37 stops rotating. Is large, it is possible to reverse the supply core 33 and rewind the ink ribbon 32 only when a large amount of the ink ribbon 32 is excessively sent from the supply core 33.

In consideration of the fact that the rotation speed of the supply core 33 changes according to the winding amount of the ink ribbon 32,
As shown in FIG. 16, a rotary encoder 292 for detecting the rotation speed of the supply knob 24 can be used as the winding amount detecting means. Also, the rotary encoder 292
It is detected whether or not the supply knob 24 is excessively rotated after the rotation of the supply knob 26 due to the inertial force, and the supply knob 24 is reversely rotated only when the supply knob 24 is excessively rotated according to the detection result. It may be.

In the configuration shown in FIG. 15, if the housing of the ribbon cassette 31 is made of a light-transmitting material, it is not necessary to form a hole.

[0078]

According to the first aspect of the present invention, a supply knob is provided for each of a plurality of supply cores each wound with a plurality of types of ink ribbons wound on the take-up core in different states. When the take-up core is stopped due to a change in the take-up state of the ink ribbon, a different state of load is applied to the supply core in accordance with the engagement state with the supply core. When the inertia force acting on the core changes, a load corresponding to the inertia force acting on the supply core is applied to the supply core via the supply knob, and the supply core is rotated excessively by the inertia force after the winding core stops. To prevent loosening of the ink ribbon occurring near the supply core, without causing running failure or winding failure of the ink ribbon, and reducing the rotational force of the winding core. Tsu without causing winding failure of the ink ribbon due to weaker than click tension can always maintain good image quality.

According to the second aspect of the present invention, the position of the supply knob engaged with the supply core in the vertical direction is changed in accordance with the winding state of the ink ribbon wound on the supply core, whereby the winding is performed. The load corresponding to the winding state of the ink ribbon is applied to the supply core via the supply knob, and the load corresponding to the inertia force when the rotation of the winding core is stopped is applied to the supply core, and the winding is performed. It is possible to prevent the supply core from being excessively rotated by the inertial force after the core stops.

According to the third aspect of the present invention, the length of each of the plurality of upper and lower engaging portions of the supply knob having different outer diameters depends on the winding state of the ink ribbon wound around the supply core. The upper and lower positions of the supply knob are changed according to the winding state of the ink ribbon wound around the supply core by engaging each of the different engagement pins, and the winding state is changed according to the winding state of the wound ink ribbon. The load is applied to the supply core via the supply knob, and the load corresponding to the inertia force when the winding core stops rotating is applied to the supply core,
It is possible to prevent the supply core from being excessively rotated by the inertial force after the winding core is stopped.

According to the fourth aspect of the present invention, a different load is applied to the supply knob from the elastic member in accordance with the vertical position of the supply knob, thereby winding the ink ribbon around the supply core. When the vertical position of the supply knob changes according to the take-up state, a load corresponding to the take-up state of the ink ribbon wound around the supply core is applied to the supply knob, and the take-up core stops rotating. A load corresponding to the inertia force at that time can be applied to the supply core, and the supply core can be prevented from being excessively rotated by the inertia force after the winding core is stopped.

According to the fifth aspect of the present invention, the supply core is rotated in the reverse direction at a predetermined time after the rotation of the winding knob has been stopped, so that immediately after the rotation of the winding knob has been stopped, the supply core has an inertia. The ink ribbon excessively fed from the supply core by being rotated by the force can be taken up by the supply core which rotates in the reverse direction, and the magnitude of the inertial force acting on the supply core is determined by the amount of winding of the ink ribbon in the supply core. Even when the ink ribbon slightly changes, the loosening of the ink ribbon in the vicinity of the supply core can be reliably prevented.

According to the invention described in claim 6, the supply knob and the supply core are reversed by the driving force transmitted from the drive system provided for moving the print head. It is not necessary to separately provide a drive system only in the apparatus, and the configuration of the apparatus can be simplified.

According to the seventh aspect of the invention, by selectively reversing the supply knob and the supply core in accordance with the winding amount of the ink ribbon in the supply core, the winding amount of the ink ribbon in the supply core can be reduced. The supply core is reversed only when the inertia force when the take-up core stops is relatively large, and the winding amount of the ink ribbon in the supply core is relatively small, and the inertia force when the take-up core stops is low. When the supply core is small, the supply core is not reversed, so that only the excess ink ribbon sent from the supply core can be reliably rewound.

According to the eighth aspect of the present invention, by selectively reversing the supply knob and the supply core according to the rotation speed of the supply core in a state where the ink ribbon is wound on the take-up core, The supply core is reversed only when the rotational speed of the supply core is relatively slow and the amount of winding of the ink ribbon is large, and the inertia force when the take-up core stops is large. If the inertia force when the take-up core stops due to the small winding amount of the ribbon is small, do not reverse the supply core and ensure that only the excess ink ribbon sent from the supply core is rewound. it can.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a thermal printer unit to which the present invention is applied.

FIG. 2 is a diagram illustrating an internal state of a ribbon cassette mounted on a carriage of the printer unit according to the first embodiment of the present invention.

FIG. 3 is an external view showing a shape of a supply knob provided on a carriage of the printer unit.

FIG. 4 is a partially cutaway view showing a shape of a supply core of a ribbon cassette used in the printer unit.

FIG. 5 is a cross-sectional view showing a state where the ribbon cassette is mounted on a carriage in the printer unit.

FIG. 6 is a diagram showing another example of the shapes of a supply core of a ribbon cassette and a supply knob of a carriage used in the printer unit.

FIG. 7 is a view showing still another example of the shapes of the supply core of the ribbon cassette and the supply knob of the carriage used in the printer unit.

FIG. 8 is a view showing still another example of the shapes of the supply core of the ribbon cassette and the supply knob of the carriage used in the printer unit.

FIG. 9 is a plan view showing a configuration of a carriage in a printer unit according to a second embodiment of the present invention and a state during forward movement.

FIG. 10 is a plan view showing a state in which the supply knob in the carriage is rotated reversely.

FIG. 11 is a plan view showing a state in which the carriage moves backward.

FIG. 12 is a diagram illustrating a configuration of another example of a carriage provided in the printer unit according to the second embodiment and a state during forward movement.

FIG. 13 is a plan view showing a state in which the supply knob of the carriage is rotated in the reverse direction.

FIG. 14 is a plan view showing a state in which the carriage moves backward.

FIG. 15 is a side sectional view showing a configuration of a carriage of the printer unit according to the embodiment of the present invention.

FIG. 16 is a side sectional view showing a configuration of a carriage of the printer unit according to the embodiment of the present invention.

[Explanation of symbols]

 11-Printer Unit 21-Carriage 23-Print Head 24-Supply Knob 25-Back Tension Spring 26-Rewind Knob 31-Ribbon Cassette 32-Ink Ribbon 33-Supply Core 37-Rewind Core

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigenori Morimoto 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Kenji 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (for reference) 2C068 AA01 AA06 EE02 FF01 FF05 GK01 MM23

Claims (8)

[Claims] The supply core includes a supply knob and a take-up knob which are respectively engaged with a supply core and a take-up core rotatably supported in a ribbon cassette. In a printer device for winding an ink ribbon wound around a core and stored around a print head and a recording sheet, the supply knob may be configured such that a plurality of winding states of the stored ink ribbon are different from each other. An engagement structure that engages with the supply core in a different engagement state for each type of ribbon cassette, and a load member that applies a different load to the supply core according to the engagement state in the engagement structure. Characteristic printer device. 2. The method according to claim 1, wherein the engagement structure engages the supply knob with supply cores of a plurality of types of ribbon cassettes containing different types of ink ribbons at different vertical positions. A printer device as described. 3. The supply mechanism according to claim 2, wherein the supply knob includes upper and lower two-stage engagement portions having different outer diameters from each other, and engagement pins having different lengths depending on the type of ink ribbon wound around the supply core. 3. The printer device according to claim 2, wherein the printer device is configured. 4. The printer device according to claim 2, wherein the load member is an elastic member that applies a load in a different state to the supply knob depending on the position of the supply knob in the vertical direction. 5. A supply core and a take-up knob which are respectively engaged with a supply core and a take-up core rotatably supported in a ribbon cassette, and the take-up core is rotated via the take-up knob to supply the supply core. In a printer device for winding an ink ribbon wound around a core and stored between a print head and a recording paper, the supply knob is provided at a predetermined time after the winding knob stops rotating. A printer device provided with a reversing means for rotating the ink ribbon in a direction opposite to a drawing direction of the ink ribbon. 6. The printer device according to claim 5, wherein said reverse rotation means includes means for transmitting a driving force for reversely rotating the supply knob from a drive system for moving the print head between the printing position and the release position. 7. A winding amount detecting means for detecting a winding amount of the ink ribbon in the supply core, wherein the reversing means selectively reverses a supply knob based on a detection result of the winding amount detecting means. Item 7. The printer according to item 5 or 6. 8. A rotating speed detecting means for detecting a rotating speed of the supply core when the winding core is rotating, wherein the reversing means selectively reverses the supply knob based on a detection result of the rotating speed detecting means. The printer device according to claim 5.