JPS59199280A - Cassette ribbon for printer - Google Patents

Abstract

PURPOSE:To contrive to reduce the size of a cassette casing and increase ribbon-containing capacity, by a method wherein a ribbon to be contained is folded with a span equal to the sum of the radius of a driving roller and the radius of a driven roller, and stopper pieces are provided with guide surfaces wide opened toward the interior of a ribbon-containing chamber. CONSTITUTION:The driving roller 16 and the driven roller 17 are provided with the stopper pieces 21, 22 which are inserted into grooves 20. The stopper pieces 21, 22 release the ribbon 14 from the rollers at positions angularly deviated from the contact point (a) of the rollers 16, 17 by 90 deg.. The stopper pieces 21, 22 are integrally provided with the guide surfaces 23, 24 wide opened from the releasing points (b), (c) toward the depth of the ribbon-containing chamber 11. Therefore, the ribbon 14 is fed out in a large wave manner while being folded in a small zigzag form with a span equal to the sum of the radii of the rollers 16, 17, by the guide surface 24 when the density thereof is higher at an upper part of the interior of the chamber 11, and by the guide surface 23 when the density is higher at a lower part of the interior of the chamber 11.

Description

TECHNICAL FIELD OF THE INVENTION This invention relates to printer cassette ribbons.

Technical background of the invention and its problems In this type of device, an endless ribbon is folded and stored in a cassette case, and a driving roller and a driven roller arranged on one side of the cassette case are connected to the outside (platen). The ribbon is pulled into the inside of the cassette case from the front side of the cassette case and pulled out from the other side, but the ribbon pulled in by the driving roller and the driven roller is folded into small pieces and its path is extremely narrow. Irregular. For this reason.

If ribbons are packed densely in the ribbon storage chamber, it becomes difficult to pull out the ribbons, so it is necessary to increase the ribbon storage capacity relative to the length of the ribbon, and if the cassette case is made smaller, the length of the ribbon must also be made shorter. .

From this, the invention shown in Figure 1 (Japanese Patent Publication No. 57-
38434)). In this invention, a driving roller (3) and a driven roller (4) are provided on the negative side of a ribbon storage case (2) formed in a cassette case (1), and these driving roller (3) and driven roller (4) The ribbon (8) wrapped around the driving roller (3) and the driven roller (4) is peeled off by the stoppers (6) and (7) inserted into the grooves (5) formed on the outer periphery of the driving roller (3) and the driven roller (4).
3) Fold the ribbon (8) in a large span equal to the sum of the diameters of (4), and fold the ribbon (8) in an orderly manner without disrupting the first-in, first-out order. It is designed to be pulled out. That is, the ribbon (8) is folded into a large size to match the width of the cassette case (1), but in order to do so, the driving roller (3) and the driven roller (4) must be This has the disadvantage that the larger the ribbon (8), the smaller the amount of ribbon (8) that can be accommodated. Also, something like this is a ribbon (8
) is approximately equal to the width of the ribbon storage space (2), so the ribbon storage space (2) is limited to a quadrilateral shape.

Purpose of the Invention The present invention has been made in view of the above points, and is capable of moving ribbons in an orderly manner within a cassette case.
Moreover, it is an object of the present invention to provide a cassette ribbon for a printer in which the diameters of the driving and driven rollers are made large so that the cassette case can be made smaller and the ribbon storage capacity can be increased.

Summary of the Invention This invention provides a driving roller and a driven roller on one side of a ribbon storage chamber, and inserts a stopper piece into an annular groove formed in each of these driving roller and driven roller, and drives the ribbon by these stopper pieces. The ribbon wrapped around the roller and the driven roller is separated, the ribbon is folded with a span corresponding to the sum of the radii of the driving roller and the driven roller, and the stopper piece is provided with a guide surface that expands toward the inside of the ribbon storage chamber. By forming the ribbon, even if the folding span of the ribbon is small, the ribbon is guided inward by the guide surface in order, thereby reducing the diameters of the driving roller and the driven roller.
The ribbon storage capacity can be increased relative to the size of the cassette case, and the shape of the ribbon storage chamber can be freely changed as required.

Embodiment of the Invention A first embodiment of the invention will be described with reference to FIGS. 2 and 3. The cassette case 0Q is formed with a ribbon storage chamber 0ρ and a pair of left and right arms (6) (to), and a leaf spring 0 is attached to the left arm (2) to apply tension to the endless ribbon α. ing. The ribbon storage chamber α■ is defined in the shape of an approximately horizontally long rectangular parallelepiped, and the width of its short side is much larger than the sum of the diameters of the drive roller αQ and the driven roller (1'/l).The width of the driven roller α is a plate. The cassette case αQ is rotatably held by a U-shaped bracket α biased by the barrel α and pressed against the drive roller αQ.The cassette case αQ has a groove between the drive roller αQ and the driven roller α. ) is provided on the stopper piece Q〃, which is inserted into the stopper piece Q〃. One of the stopper edges is integrally formed with the cassette case a0, and the other stopper edge is held by a bracket (2).

These stopper pieces 01)H move the ribbon α◆ to the roller αQαη at a position deviated by 90° in the ribbon retraction direction on the outer periphery of the roller α→α from the contact point (a) between the driving roller αQ and the driven roller α Ribbon peeling point (A)
(O). However, the stopper piece e
A guide surface (C) (C) that expands as it goes from the ribbon separation point (41 (Ol) to the back of the ribbon storage chamber αυ) is integrally formed at η (A).

In such a configuration, the drive roller αQ is connected to a motor (not shown) and rotated (the ribbon α→ is drawn in. At this time, the ribbon α→ wound around the outer periphery of the drive roller 20Q is rotated at the latest. At the peeling point (4), the sheet is peeled off from the drive roller α, folded to the opposite side, and further abutted against the stopper (a) on the opposite side and folded to the opposite side, which is repeated. If the ribbon α is wrapped around the driven row 2αη, the ribbon α will reach the ribbon separation point (−
1, it is separated from the drive roller α and folded in the opposite direction, and then comes into contact with the stopper Qυ on the opposite side and is successively folded in a zigzag pattern. Therefore, the span over which the ribbon α4 is folded is approximately the length of the driving roller αQ and the driven roller aη.
is equal to the sum of the radii of The length of this span is approximately half that of the conventional example shown in FIG.
) are sequentially fed toward the back of the silicone storage chamber α by either one of the guide surfaces (to) and (c). Which guiding surface () (c) the ribbon is guided to depends on changes in resistance based on how thick the ribbon is. That is, when the density in the upper part of the ribbon storage chamber α〃 is high, the ribbon α◆ is fed out by the lower guide surface (C), and when the density in the lower part is high, it is fed out by the upper guide surface device. , is folded into a small zigzag shape with the sum of the radii of the driving roller 0Q and the driven roller αη, and is sent out with large waves. Therefore, in the ribbon storage chamber α force, ribbon α→
are pulled out from the left arm (6) in the order in which they were pulled in first. In this way, even if the span for folding the ribbon α→ is small, the ribbon α is properly fed, so the drive roller αQ and the driven roller α can be made smaller, and the length of the ribbon α◆ can be reduced accordingly. In other words, the ribbon storage capacity can be increased.

Next, a second embodiment of the present invention will be explained based on FIG. 4. The same parts as in the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, a recess (c) for allowing a part of the print head (c) to escape is formed on the upper side of the ribbon storage chamber α2.

In other words, the cassette case 0Q can be mounted on the carrier together with the print head (c), but depending on the layout of the parts on the carrier, the cassette case α1 and the print head (c) can be mounted on the carrier.
It is possible to prevent interference with This also makes it possible to design a smaller carrier.

This is only possible because the ribbon 04 has a small folding span, and is one of the effects obtained by the configuration of the present invention.

In addition, in the first and second embodiments, the drive roller αQ
The sum of the diameters of the driven roller σ and the diameter of the ribbon storage chamber α on the drawing is
Although it is about two-thirds of the width of the short side of η, in reality it can be made less than one-half to further increase the storage capacity of the ribbon α-thickness, and while satisfying this condition, the ribbon α-thickness can be sorted. It is possible to do so.

Effects of the Invention Since the present invention is constructed as described above, the ribbons folded into small pieces can be arranged on the guide surface formed on the stopper piece and sequentially sent to the back of the ribbon storage chamber. The ribbon storage capacity can be increased by reducing the size of the roller and the driven roller, and the shape of the ribbon storage chamber can be freely changed according to the design of the carrier.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing a conventional example, Fig. 2 is a plan view showing the inside of a cassette case relating to the first embodiment of the present invention, and Fig. 3 is an enlarged view of the main parts. FIG. 4 is a plan view showing the inside of the cassette case according to a second embodiment of the present invention. 10... Cassette case, 11... Ribbon storage chamber,
14... Ribbon, 16... Drive roller, 17...
Driven roller, 2o...Groove, 21, 22...Stopper piece, 23, 24...Guide surface, α...Contact point, Ne...
O... Ribbon peeling point Applicant Tokyo Electric Co., Ltd. 5Z Shil 1 diagram row 〃

Claims (1)

[Claims] A ribbon cassette having a ribbon storage chamber for folding and storing an endless ribbon is provided, and one side of the ribbon storage chamber has a sum of diameters approximately 2 times the width of one side of the ribbon storage chamber.
A driving roller and a driven roller each having a size close to 1/2 are provided, an annular groove is formed on the outer periphery of the driving roller and the driven roller, and a ring-shaped groove is formed on the ribbon retraction side from a contact point on the outer periphery of the driving roller and the driven roller. A stopper piece having a ribbon peeling point formed at a position offset by approximately 90 degrees from the ribbon peeling point is inserted into the groove of the driving roller and the driven roller and provided in the cassette case; A cassette ribbon for a printer, characterized in that a guide surface that gradually expands toward the ribbon storage chamber is integrally formed.