JPH04115679U - ink ribbon cassette - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the running of the ink ribbon by reducing the inclination of the pinch roller with respect to the lower surface (upper surface) of the cassette body, and also to allow general users to easily replace pancakes. [Structure] A pinch roller 2 is rotatably supported on a shaft 4 attached to a cassette body 1, and an E-type washer 5 is attached to the upper part to prevent it from coming off. At this time, the gear 2a on the outer periphery of the pinch roller 2 and the drive gear 6 on the carriage 7 mesh with each other to rotate the pinch roller 2.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an ink ribbon cassette used in a printer device, and particularly relates to an ink ribbon cassette used in a printer. The present invention relates to the structure of an ink ribbon cassette that is characterized by the transmission of rotational force of rollers.

0002

[Conventional technology]

FIG. 4 shows the pinch roller 2 and carriage 7 in a conventional ink ribbon cassette. This shows the positional relationship with the drive shaft 8 above. Figure 5 shows the ink ribbon cassette FIG. 2 is a cross-sectional view when a pinch roller 2 is attached. Figure 6 shows the ink ribbon cassette The figure shows the details of the engagement part between the pinch roller 2 and the drive shaft 8 when it is attached to the carriage 7. FIG. Figure 7 shows the position when each part is assembled into the ink ribbon cassette. FIG. According to FIG. 7, the ink ribbon 3 has a small roller 10, a pin It is wound onto a take-up reel 9 via a chiller 2. This ink ribbon 3 is a skein. As printing is performed by the thermal head 11 at the opening 1d of the cutter body 1, the thermal The ink ribbon 3 is sequentially supplied by the clamping force between the head 11 and a platen (not shown). be done. In addition, the ink ribbon 3 is wrapped around the pinch roller 2 about half a circumference as will be described later. The pinch roller 2 uses its frictional force to wind up the ink ribbon 3 and finalize it. It is then wound onto the take-up reel 9.

0003 As shown in FIGS. 4, 5, and 6, the pin provided on the cassette body 1 The pinch roller 2 has a cylindrical shape and is hollow inside, and has a plurality of convex portions 2a defined on the inner circumference. It is established according to the rules. Also, on the outer periphery of the drive shaft 8 that rotates the pinch roller 2, A plurality of convex portions 8a are provided regularly. Carriage the cassette body 1 here. 7, the drive shaft 8 provided on the carriage 7 is inserted into the pinch roller 2. It is inserted into the hollow part 2b, and the convex part 8a of the drive shaft 8 and the convex part 2a of the pinch roller 2 engage with each other. The pinch roller 2 was rotated by transmitting the power of the drive shaft 8. Also shown in Figure 5. As shown in the figure, the pinch roller 2 is an L-shaped member attached to the cassette body 1. It is fastened in a snap-in manner using the spring properties of 1a. At this time, pinch low The roller 2 includes a member 1a and a pinch roller to rotatably support the cassette body 1. Clearance was provided between the two. If you reduce this clearance here, the When placing the set body 1 on the carriage 7, due to variations in parts and installation conditions. The pinch roller 2 is pressed against the cassette main body 1 or the L-shaped member 1a, and the pinch roller 2 is pressed smoothly. Since it becomes impossible to obtain smooth rotation, it is greatly cleared as it absorbs the variation of parts. A lance was provided.

0004 Among the ink ribbon cassettes on the market these days, running costs are lower. Instead of replacing the entire cassette, general users can replace the used one. "Pancake replacement type cassette" where only the ink ribbon can be replaced with a new ink ribbon. "Pancakes: ink ribbons wrapped around reels" are now on the market. Pancakes when the “pancake exchange type cassette” is equipped with a pinch roller The procedure for replacing the cassette body 1 is to separate the cassette body 1 into an upper case 1b and a lower case 1c. , remove the pinch roller 2 attached to the lower case 1c, and pinch it with the member 1a. Replace the ink ribbon 3 that was passed between the rollers 2 with a new one, and use the pinch roller. Assembling by reattaching La 2 and then combining upper and lower cases 1b and 1c again. It was necessary to do this.

[0005]

[Problem that the idea aims to solve]

However, as mentioned above, the L-shaped member attached to the cassette body and the pinch roller If there is a large clearance with the roller, the bottom (top) of the cassette body may get stuck during printing. However, the pinch roller is tilted, and the product is wrapped around the tilted pinch roller. The tension balance between the top and bottom of the ink ribbon is lost, causing the ink ribbon to shift to either the top or bottom. When it is wound on the take-up reel, it becomes bamboo shoot-like and cannot be wound all the way to the end. There was a drawback that it ended up happening. Also, if you use a replaceable pancake cassette, Another drawback was that assembly was complicated for general users.

[0006] The present invention has been made in consideration of the above-mentioned problems. The inclination of the pinch roller is reduced to stabilize the running of the ink ribbon, and We provide an ink ribbon cassette that allows even general users to easily replace pancakes. The purpose is to

[0007]

[Means to solve the problem]

In order to solve the above problems, in the ink ribbon cassette of the present invention, the pinch roller is It is rotatably supported by a shaft provided in the set body, and is attached to the outer circumference of the pinch roller. The feature is that an engaging part is formed for the drive body that rotates the pinch roller. do.

[0008]

[Effect]

According to the present invention, the pinch roller can be rotated freely by the shaft provided in the cassette body. It is supported on the outer circumferential side of the pinch roller and is connected to the drive body that rotates this pinch roller. Since the joint is formed, the clearance between the shaft and the hollow inside of the pinch roller is It can be made smaller and the tilt of the pinch roller relative to the case body can be reduced. The ink ribbon runs stably. Also, the pinch roller can be easily removed without removing the pinch roller. Since the main cake can be replaced, even general users can easily assemble it.

[0009]

【Example】

Embodiments of the present invention shown in FIGS. 1 and 2 will be described below. FIG. 1 is a diagram showing the positional relationship of component parts in a first embodiment of the present invention. figure 2 is a cross-sectional view of the pinch roller 2 in the first embodiment of the present invention when it is attached. In this example, the positional relationship of the parts is almost the same as in the conventional example, so the present invention The details of the pinch roller section, which is a feature, are described below.

0010 As shown in FIGS. 1 and 2, the cassette body 1 has an upper case 1b and a lower case 1c. For example, a pinch roller 2 is attached to a shaft 4 attached to the lower case 1c. It is rotatably supported, and an E-type washer 5 is attached to the top to prevent it from coming off. Ru. Here, a gear 2a formed on the outer periphery of the pinch roller 2 is a driving force on the carriage 7. The pinch roller 2 meshes with the gear 6 and rotates as the drive gear 6 rotates. Skein An opening 1e for inserting the drive gear 6 is formed in the lower case 1c of the kit body 1. It is. In this embodiment, the inclination of the pinch roller 2 is determined by the outer diameter of the shaft 4 and the pinch roller. This clearance is determined only by the dimensional tolerance of the part with the inner diameter of The inclination of the pinch roller 2 is reduced and the running of the ink ribbon is reduced. becomes stable.

[0011] In addition, the pinch roller 2 is fixed with an E-type washer 5 so that it does not come off the shaft 4. The ink ribbon 3 can eliminate the L-shaped member 1a that was conventionally required. Simply pass around the outer circumference of the pinch roller 2, and even general users can easily pass the pin. You can replace the cake and assemble the cassette.

0012 FIG. 3 shows a second embodiment of the present invention. As shown in Figure 3, the basic structure The configuration is almost the same as the first embodiment, but the parts are arranged symmetrically and the cassette Two openings 1e are opened in each of the upper case 1b and the lower case 1c of the main body 1. In addition, the pinch rollers 2 are rotated at the upper and lower ends respectively. There is a gear 2a that allows the In this example, the ink ribbon can be used by flipping the front and back sides. When assembling the cassette, the left and right pinch rollers are assembled regardless of the vertical direction. can be done. In the first embodiment and the second embodiment, the outer periphery of the pinch roller 2 is fitted with a drive body. The gear 2a is used as a part of the A pinch roller may be used to transmit the driving force.

[0013]

[Effect of the idea]

As explained above, according to the present invention, the pinch roller is provided in the cassette body. The pinch roller is rotatably supported by a twisted shaft, and has an engaging part for the drive body on the outer periphery of the pinch roller. By providing this, the clearance between the shaft and the pinch roller can be reduced. Therefore, the inclination of the pinch roller becomes smaller, and the running of the ink ribbon becomes stable. Ma You can change pancakes without removing the pinch roller from the cassette body. Therefore, even general users can easily assemble it.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the pinch roller mounting part of the present invention.

FIG. 3 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is a sectional view of a pinch roller mounting portion in a conventional example.

FIG. 6 is a plan view of the waist showing the state of engagement between the pinch roller and the drive shaft in a conventional example.

FIG. 7 is a plan view showing a state in which an ink ribbon is installed in a conventional example.

[Explanation of symbols]

1 Cassette body 2 Pinch roller 2a gear 3 Ink ribbon 4 axes 5 E type washer 6 Drive gear 7 Carriage 8 Drive shaft 9 Take-up reel

Claims (1)

[Scope of utility model registration request] 1. An ink ribbon cassette including a pinch roller for winding up an ink ribbon within a cassette body, wherein the pinch roller is rotatably supported by a shaft provided in the cassette body, and a An ink ribbon cassette characterized in that an engagement portion for a drive body that rotates the pinch roller is formed.