JPH0535327U - Ink ribbon cassette - Google Patents

Abstract

(57) [Summary] [Structure] Ribbon guide 7a protruding from the ribbon storage
When the both ends of the ribbon protector 10 are locked between the tips of the ribbon protectors 7 and 7b to form the ink ribbon cassette, the ribbon guide portions 7a and 7b have protrusions protruding 0.05 to 0.3 mm in the thickness direction of the ink ribbon cassette. The ribbon protector 10 includes a pin and a pin provided with a protrusion protruding from the upper surface on the outer surface.
The engaging portions with a and 7b are provided with rectangular holes having substantially the same aperture width or slightly larger than that. Here, one of the rectangular holes is fixed to the pin, and the other is locked to the pin with play. [Effect] The ribbon protector can be easily fitted into the ink ribbon cassette and can be easily removed, and the elasticity of the ribbon protector can freely move the position of the ink ribbon back and forth. It is possible to prevent the vehicle from becoming dirty and hindering traveling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ink ribbon cassette for a serial printer.

[0002]

[Prior Art]

 Conventionally, the ink ribbon cassette has a box-shaped endless ink ribbon in consideration of ease of attachment of the ink ribbon to the printer body, elimination of stains on the hands and the periphery of the attachment part when attaching the ink ribbon, and size reduction. There is an ink ribbon cassette that is stored in a cassette and used by mounting it on the carriage.

As shown in FIG. 4, an ink ribbon cassette of this type includes a cassette housing 2 including left and right arm-shaped ribbon guide portions 2a and 2b and a ribbon storage portion 2c for storing the endless ink ribbon 1. It has a ribbon protector 10.

At the time of printing by the printer, the ribbon guide portions 2a and 2b are set in the printer so as to hold the print head, and the endless ink ribbon 1 stored in the ribbon storage portion 2c is transferred from one ribbon guide portion to the outside. Then, it is introduced from the other ribbon guide portion into the inside of the ribbon storage portion 2c, and the exposed portion of the ink ribbon 1 is used for printing. The ink ribbon in the ink ribbon cassette circulates and updates the exposed part.

The ribbon protector 10 is provided in order to prevent the ink ribbon 1 from slacking or contaminating the printing paper surface when an obstacle such as dust is present on the printing head or the printing paper surface during printing. In particular, when the ink ribbon 1 is loosened, not only the surface of the printing paper is contaminated, but also the running failure of the ink ribbon 1 and the jamming of the printing paper are caused.

The ribbon protector 10 is made of an elastic material such as a plastic sheet and has a printing hole in the center. Further, both ends of the ribbon protector 10 have holes for fixing the ribbon protector to the ribbon protector fixing pins 7a and 7b provided in the ribbon guide portions 2a and 2b.

[0007]

[Problems to be solved by the device]

 However, in such an ink ribbon cassette, it is not easy to handle the ink ribbon cassette because the elasticity of the ribbon protector causes the end of the ribbon protector to jump up and easily come off, or the entire ribbon protector is aligned.

[0008]

[Means for Solving the Problems]

 The present invention provides an ink ribbon cassette having a ribbon storage portion, first and second ribbon guide portions protruding from the ribbon storage portion, and a ribbon protector having both ends locked between the tips of the ribbon guide portion. The first ribbon guide part has a first pin provided with a protrusion protruding by 0.05 to 0.3 mm in the thickness direction of the ink ribbon cassette, and the second ribbon guide part is an outer cover. The ribbon protector is composed of an elastic body, and has a width and a length of the first pin at a locking portion with the first pin. Is the width of the first rectangular hole having a hole width and hole length substantially the same or slightly larger than that of the second pin and the width of the second pin at the engaging portion with the second pin? The aperture width is slightly larger than that, Is characterized in that have a second rectangular hole of the pin diagonal length greater than the opening length of the.

[0009]

[Action]

 According to the present invention, since the width of the first pin and the first rectangular hole and the width of the second pin and the width of the second rectangular hole are substantially equal to each other, the ribbon protector is securely locked to the ink ribbon cassette, Since the protector is made of an elastic body and the opening length of the second rectangular hole is larger than the second pin length, the ribbon protector can be freely moved back and forth according to the contact condition with the print medium. Further, since the first pin is provided with the protrusion, it is difficult for the ribbon protector to come off naturally after the ribbon protector is once fitted into the ink ribbon cassette.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an ink ribbon cassette showing an embodiment of the present invention, FIG. 2 is a plan view of a lid of the ink ribbon cassette, and FIG. 3 is a view showing a positional relationship between a ribbon protector and pins of the ink ribbon cassette.

In FIG. 1, the ink ribbon cassette includes an endless ink ribbon 1, an ink ribbon cassette housing 2 that houses the ink ribbon 1, and a ribbon protector 10.

The cassette housing 2 is composed of a pair of arm-shaped ribbon guide portions 2a and 2b for leading out the ink ribbon 1 and a ribbon storage portion 2c for folding and storing the ink ribbon 1.

The ribbon guide portions 2a and 2b are provided with pins 7a and 7b, and the drive roller 3 and the drive roller 3 and the ink ribbon 1 are sandwiched between the ribbon storage portion 2c and the ink ribbon 1 for feeding. A driven roller 4 provided opposite to each other, a movable supporting member 5 for pressing the driven roller 4 against the driving roller 3, and a spring 6 are provided.

The ink ribbon cassette is set so as to hold the print head 11 of the printer body by the ribbon guide portions 2a and 2b, and prints on a print medium between the platen 12 and the ribbon protector 10.

In FIG. 2, pressing portions 9 a and 9 b are provided on the arm portion of the lid 8.

In FIG. 3A, the ribbon protector 10 is formed of a plastic sheet having a long shape and a wide central portion. The plastic sheet has a thickness that provides elasticity. The ribbon protector 10 has rectangular holes 10a and 10b at both ends for fitting with the pins 7a and 7b, and a diamond-shaped hole 10c for printing by a wire dot print head in the middle of the wide portion of the central portion. Have.

The pin 7a is formed in a rectangular parallelepiped shape, and the upper surface portion thereof projects in the direction of the pin 7b. Further, in the pin 7a, a protrusion 71 is provided on the side surface in the thickness direction of the ink ribbon cassette provided with the pin 7a. The protrusion 71 has the dimensions h1, h2, h3, and θ shown in FIG. 3 (b): h1 ... 0.05-0.3 mm h2 ... 0.05-0.3 mm h3 ... 0.05-0. 3 mmθ ... 30 to 60 ° is preferable.

The pin 7b is formed in a rectangular parallelepiped shape, and has an upper surface portion with a projection 72 protruding in a direction opposite to the direction of the pin 7b.

The ribbon protector 10 is attached to the ribbon guide portions 2a and 2b as shown in FIG.

First, the end portion of the ribbon protector 10 having the rectangular hole 10b is passed under the holding portion 9b provided on the lid 8, and the rectangular hole 10b is attached so as to be hooked on the protrusion 72 of the pin 7b. Next, the other end of the ribbon protector 10 is passed under the pressing portion 9a provided on the lid 8, and the rectangular hole 10a is hooked on the pin 7a to be attached. Since the ribbon protector 10 is attached in this manner, rattling is less likely to occur when it is attached, and in order to prevent the ribbon protector from coming off, the rectangular hole of the ribbon protector 10 is set as follows.

The opening width d1 of the rectangular holes 10a and 10b provided in the ribbon protector 10 is formed to be substantially the same as or slightly larger than the width d2 of the pins 7a and 7b. Similarly, the opening length l1 of the rectangular hole 10a is formed slightly larger than the length 12 of the pin 7a. Further, the opening length l3 of the rectangular hole 10b is formed larger than the diagonal length l4 of the pin 7b.

As described above, by making the opening width of the rectangular holes 10a and 10b substantially equal to or slightly larger than the width of the pins 7a and 7b, the gap between the ribbon protector 10 and the pin 7 is increased. Disappears. Here, since the pin 7a is provided with the protrusion 71, the ribbon protector 10 having the width of the pin 7a and the opening width of the rectangular hole 10a substantially equal to each other, once the ribbon protector 10 is fitted, the end portion of the ribbon protector 10 is prevented by the protrusion 71. It prevents the rising and coming off of the.

Further, the dimension 15 between the rectangular holes of the ribbon protector is as follows: the inner surface of the pin 7a (hereinafter, the surface of the pin 7 in FIG. 3 facing the other pin is referred to as the inner surface, and the surface opposite thereto). It is preferable that the relationship between the dimension l6 between the outer surface) and the outer surface of the pin 7b and the dimension l7 between the inner surface of the pin 7a and the tip of the protrusion 72 of the pin 7b be l6 <l5 <l7.

With this structure, the protrusion 72 prevents the rectangular hole 10b of the ribbon protector 10 that is once fitted into the pin 7b from coming off, and allows the play of the ribbon protector 10 to be equal to the dimensional difference of 14 and 15. This makes it easier to handle the ink ribbon. That is, due to this play, the ribbon protector 10 having an appropriate elasticity can take a free position between the print medium 13 and the ink ribbon 1. Further, the rhombic hole 10c can be adjusted to a predetermined position by adjusting the above dimensions.

[0025]

[Effect of the device]

 As described above, according to the present invention, pins are provided on both ribbon guide portions of the ink ribbon cassette, and the rectangular holes formed at both ends of the ribbon protector having elasticity are fitted into the pins, and the pins provided on the lid of the ink ribbon cassette are pressed. Part of the ribbon protector so that it does not come off from both ribbon guide parts, and the dimension between the pins and the rectangular hole of the ribbon protector has a predetermined relationship so that the play allowance part and the fixing part of the ribbon protector are prevented from coming off. Since the protrusions are provided, it is easy to fit the ribbon protector into both ribbon guides, but it is prevented from coming off spontaneously thereafter.

Further, in the present invention, since there is a clearance between the one pin and the opening length of the rectangular hole, which is a play, the elasticity of the ribbon protector is affected by the projections of the perforation of the print medium or the unevenness of the medium. Depending on the, you can move the ink ribbon back and forth and adjust its position. As a result, even if the print medium has irregularities, the ink ribbon does not strongly press the print medium, no traces are left on the print medium, and the running is not hindered. At the same time, the ribbon protector can be set in a fixed position due to its elasticity, so that it is not necessary to position the ribbon protector with high precision, and the parts can be easily manufactured.

Further, when a plurality of printing papers are stacked and used for copying, the degree of slack of the printing papers and swelling of perforations at that time are further increased. In such a case, the ribbon protector of the present invention is used. The effect can be exhibited further.

[Brief description of drawings]

FIG. 1 is a plan view of an ink ribbon cassette for explaining an embodiment of the present invention.

FIG. 2 is a perspective view of an ink ribbon cassette lid for explaining an embodiment of the present invention.

FIG. 3 is an enlarged view of a main part for explaining a ribbon protector and a pin size.

FIG. 4 is a perspective view of an ink ribbon cassette.

FIG. 5 is a perspective view of an ink ribbon cassette for explaining an embodiment of the present invention.

[Explanation of symbols]

 1 Ink Ribbon 2 Cassette Housing 2a Ribbon Guide 2b Ribbon Guide 2c Ribbon Storage 3 Drive Roller 4 Driven Roller 5 Movable Supporting Member 6 Spring 7a Pin 7b Pin 8 Lid 9a Holding 9b Holding 10 Rib Protector 10a Rectangular Hole 10b Rectangular hole 10c Rhombic hole 71 Protrusion 72 Protrusion

Claims (1)

[Scope of utility model registration request] 1. An ink ribbon cassette comprising: a ribbon accommodating portion; first and second ribbon guide portions protruding from the ribbon accommodating portion; and a ribbon protector having both ends locked between the tips of the ribbon guide portions. The first ribbon guide portion has a first pin provided with a protrusion protruding by 0.05 to 0.3 mm in the thickness direction of the ink ribbon cassette, and the second ribbon guide portion has an outer surface. The ribbon protector has a second pin having a protrusion protruding from the upper surface, and the ribbon protector is made of an elastic body and has a width and length substantially the same as the width and length of the first pin at a locking portion with the first pin. Or the width of the opening is slightly larger than that of the first rectangular hole, and the width of the second pin is substantially the same as the width of the second pin at the engaging portion with the second pin. Also has a slightly larger aperture width, Ink ribbon cassette characterized in that it comprises a second rectangular hole diagonal length greater than the opening length of the pin.