JPH04117767U - ribbon cassette - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the mechanism of the ribbon cassette and
To appropriately maintain an ink ribbon clamping force necessary for feeding the ink ribbon. [Structure] A long hole that does not have a driving gear, drive wheel, or driven gear or driven wheel with a pressing means such as a spring, and that the driving shaft and the driven shaft are provided in both or either one of the main body and the lid of the ribbon cassette. It was rotatably inserted into the

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on endless ink ribbons used in printers, typewriters, etc. Regarding the ribbon cassette to be stored.

0002

[Conventional technology]

The drive gear or drive wheel provided on the drive shaft (hereinafter, drive gear or drive wheel is simply referred to as (hereinafter referred to as a driving wheel) and a driven gear or driven wheel (hereinafter referred to as a driven gear) provided on a driven shaft. or the driven wheel is simply referred to as the driven wheel) to convey the endless ink ribbon. Ribbon cassettes are well known, needless to be exemplified; The driven wheel is pushed in the direction of the driving wheel using a spring, etc. In order to deal with fluctuations in the shaft position of the driven wheel, it is possible to The driven shaft is inserted into a long hole provided in the ribbon cassette.

0003

[Problem that the idea aims to solve]

In this way, in order to press the driven wheel in the direction of the driving wheel, a leaf spring, coil spring, etc. is applied to the driven wheel. When an elastic body such as If the tension becomes excessive, the driven wheel will move significantly, causing contact and meshing with the driving wheel. It becomes unstable, the running speed of the ink ribbon decreases, or in extreme cases, it may temporarily become unstable. This may even cause the ink ribbon to stop, potentially damaging the ink ribbon. stomach. In addition, when using ordinary rolls that do not depend on gear meshing, the pushing force is applied to the gears. Normally, the pushing force is weaker than when using a roll, but the pushing force was strengthened while using a roll. If this was desired, there was no other option than to increase the pressing force of the elastic body.

0004 Although it is possible to prevent this from happening by increasing the force of the spring, When the spring force is increased, excessive force is applied to the drive shaft and driven shaft, making it difficult to This will impede smooth rotation, and the shaft holes into which these shafts are inserted will be subject to significant wear. This results in shortening the life of the ribbon cassette, which is undesirable. In addition, in addition to springs, the ribbon cassette where the drive shaft and driven shaft are installed can also be used with driven wheels. Providing a part to push the drive wheel toward the drive wheel is preferable because it complicates the mechanism. It's not a bad thing. Therefore, this idea simplifies the mechanism by not providing a pressing means such as a spring. In both cases, the pressure of the driven wheels against the driving wheels is maintained while ensuring the minimum pressing force. It may affect the ink ribbon that runs without applying pressure above a certain level. The object of the present invention is to provide a ribbon cassette without any

[0005]

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention uses a drive gear or The driving wheel and the driven gear or driven wheel installed on the driven shaft are sandwiched together to create an endless In the ribbon cassette for feeding the ink ribbon, the drive gear or drive wheel is Or, it does not have a means for pressing the driven gear or the driven wheel, and the drive shaft and the driven wheel have no pressing means. The moving shaft is a shaft that is rotatably inserted between the main body and the lid of the ribbon cassette. It is a ribbon cassette.

[0006] With this device, pressure is applied to the driving gear or drive wheel or the driven gear or driven wheel. Having no means means that leaf springs, helical springs, and other elastic bodies are This means that there is no contact and pressure, and these drive gears and drive wheels , a driven shaft or a driven shaft that has a driven gear, driven wheel, etc., both shafts are fixed in position. The position of either or both of the shafts can be changed. has been done. However, the amount by which it can slide is limited to that of the conventional pressing means. This is extremely small compared to the amount that can be moved.

[0007] In this design, the long holes into which the driving shaft and driven shaft are inserted are connected to the main body 1 of the ribbon cassette and the lid. 2, or either body 1 or lid 2. , it is preferable to provide it on the lid 2 when it is either one of them. In other words, the drive shaft 4 and The driving shaft hole 9 and the driven shaft hole 10 into which the driving shaft 5 is fitted particularly tightly are located at the bottom of the main body 1. When provided in the surface 11, the elongated hole 3 is provided in the lid 2; on the contrary, the drive shaft hole 9 When the driven shaft hole 10 is provided in the lid 2, the elongated hole 3 is provided in the bottom surface 11 of the main body 1. It will be done. FIG. 2 shows an example in which a driving shaft hole 9 and a driven shaft hole 10 are provided on the bottom surface 11 of the main body 1. show. In addition, when the drive shaft hole 9 and the driven shaft hole 10 are specially provided, those drive shaft holes It is preferable to provide a guide groove 12 that gradually becomes deeper toward the driven shaft hole 10 and the guide groove 9 . This guide groove 12 connects the drive shaft 4 and the driven shaft 5 to the drive shaft hole 9 and the driven shaft hole 10, respectively. When tightly fitting, the close fitting operation is performed by sliding the end of the shaft along this guide groove 12. becomes extremely easy.

[0008] The elongated hole 3 in this invention is not limited to the shape shown in Figure 1, but can also be shaped as shown in Figure 3. It may be shaped like a kind of gourd. In other words, the part where the drive shaft 4 is fitted and the part where the driven shaft 5 is fitted are the elongated holes 3. It is preferable that the tube has both mechanisms, and that the portion connecting these two portions is a narrowed portion. Doing this has the following benefits: Increment by driving wheel and driven wheel The bong will pass over the long hole, but at this time, the width of the long hole is the same length as the diameter of the drive shaft. , the ink ribbon must pass through a point that long. When driving, it is desirable to minimize resistance as much as possible. Further from the long hole Since dust easily enters from the outside, the area of the elongated hole should be made as narrow as possible to prevent dust from entering. It is desirable to do so. These two things will be satisfied.

[0009] The length 8 of the elongated hole 3 in this invention means that the driving shaft 4 and the driven shaft 5 are connected to this elongated hole 3. , the driving wheel 6 and the driven wheel 7 of each of these shafts are inserted in a state where they are in contact with each other, and this driving Although the driving wheels and driven wheels are not shown, they are long enough to hold and feed the ink ribbon. To explain this in more detail, this invention does not include a pressing means such as a leaf spring. Since the drive shaft 4 and the driven shaft 5 inserted into the elongated hole have a limited length, In between, when the drive shaft is fixed and the driven shaft is slidable, the driving wheel 6 and the driven shaft are moved. Appropriate clamping force is required to clamp the ink ribbon with the driving wheels 7 and feed the ink ribbon. In other words, the pressing force of the driven wheel 7 against the driving wheel 6 acts, and the length of the elongated hole 3 increases. When length 8 is longer than the appropriate length for this pressing force to act, the pressing force becomes weaker. , the gripping force of the ink ribbon becomes weaker, making the feeding of the ink ribbon unstable. On the other hand, when the length of the long hole is made shorter than the appropriate length, the pressing force becomes stronger. Therefore, it is preferable when it is desired to increase the pushing force of the ink ribbon. From these points, this design secures the minimum pressing force on both sides and then A drive shaft and a slave that can obtain the pushing force for the ink ribbon that you want to have in the ribbon cassette. All you have to do is select the length of the long hole into which the moving shaft is inserted. Depending on the thickness of the bong, physical properties, material of the driving wheel and driven wheel, material of the slotted hole, and other various conditions. In the end, it is best to find it experimentally.

0010

【Example】

Figure 1 is an exploded view of a ribbon cassette showing an example of the implementation of this invention, and Figure 2 is a drive shaft. FIG. 3 is a plan view of the main part showing an example in which the hole and the driven shaft hole are specially provided on the bottom surface 11 of the main body 1. FIG. 2 is a plan view of a main part showing another example of the shape of the elongated hole. 1 is the main body of the ribbon cassette 2 is the lid of the ribbon cassette. 3 is attached to the main body 1 and lid 2 of the ribbon cassette. The drive shaft 5 is a driven shaft, and the drive shaft 4 has a drive shaft. A wheel 6 is provided on the driven shaft 5, and a driven wheel 7 is provided on the driven shaft 5. One end is connected to the long hole 3 provided in the main body 1, and the other end is connected to the long hole 3 provided in the main body 1. Although not shown, an ink ribbon is held between the fitted driving wheel 6 and the driven wheel 7. Sent. Note that 8 is the length of the elongated hole 3. In this explanation, the drive shaft 4 and driven shaft 5 are was provided with a driving wheel 6 and a driven wheel 7, but this is different from a driving gear and a driven gear. It's okay.

[0011]

[Effect of the idea]

Since this invention has been explained in detail above, it is important to note that It is possible to ensure the minimum pressing force of gears and driven wheels, and it is a leaf spring. In addition, it can be secured without requiring a pressing means such as a coil spring, etc. If you want to increase the pushing force of the link ribbon, select the length of the long hole appropriately. The push-in force is equivalent to the push-in force produced by meshing gears, and the overall mechanism is simple. It has become refined.

[Brief explanation of drawings]

FIG. 1 is an exploded view of a ribbon cassette showing an example of implementation of this invention.

FIG. 2 is a plan view of essential parts showing a case where a drive shaft hole and a driven shaft hole are provided separately on the bottom surface of the main body of the ribbon cassette.

FIG. 3 is a plan view of a main part showing another example of a long hole.

[Explanation of symbols]

1 Main body of ribbon cassette 2 Ribbon cassette lid 3 long hole 4 Drive shaft 5 Driven axis 6 Drive wheel 7 Driven wheel 8 Length of long hole 9 Drive shaft hole 10 Driven shaft hole 11 Bottom 12 Guide groove

Claims (1)

[Scope of utility model registration request] 1. A ribbon cassette that conveys an endless ink ribbon while being held between a drive gear or a drive wheel provided on a drive shaft and a driven gear or driven wheel provided on a driven shaft, wherein the drive gear or drive wheel Alternatively, the driving shaft and the driven shaft are rotatably fitted into elongated holes provided in either or both of the main body and the lid of the ribbon cassette, without having a means for pressing the driven gear or the driven wheel. A ribbon cassette characterized by: