JPS61181674A - Ribbon cassette - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The invention relates to a ribbon cassette, particularly of the type mentioned hereinafter, which holds a reel of type ribbon and moves the ribbon from a first spool to a second spool. The present invention also relates to an improvement in a ribbon cassette that is used in a manner that allows it to move. Such ribbon cassettes are currently used in many printing machines such as word processors and computer printers.

[Conventional technology]

Conventional ribbon cassettes include a two-part casing, a first spool on which the unused portion of the ribbon is wound, and a first spool from which the ribbon is wound on which the used portion of the ribbon is wound. The second spool is equipped with a driving member for guiding the second spool to the second spool.

Traditionally, some types of ribbon cassettes are! @1 To prevent rotation of the first spool to prevent spool overrun, and to allow reuse of the ribbon, the reverse orientation of the ribbon could cause the ribbon to get stuck in one place and damage the equipment. It has means for preventing winding. The means includes a disk rigidly fixed on the first spool and having large diameter serrations extending outwardly toward the circumference of the ribbon when the first spool is fully loaded; and a member that engages with the sawtooth portion to rotate the first spool in only one direction.

[Problem that the invention seeks to solve]

By the way, in the conventional device as described above, it is difficult to assemble each member in an accurate arrangement.

The present invention aims to solve these problems, and aims to provide a ribbon cassette that is simple in structure and assembly, and can suppress unnecessary rotation of the spool.

[Means for solving problems]

Therefore, the ribbon cassette of the present invention includes a casing, a first spool located in the casing and wound with the unused portion of the ribbon, and a first spool located in the casing and wound with the used portion of the ribbon. 2 spools, and an engaging member to be engaged with the second spool by a drive member in order to guide the ribbon from the first spool to the f:trJ2 spool, the cassette comprising: In order to prevent the first spool from rotating in the opposite direction, the apparatus is characterized in that a reverse rotation prevention means is provided, which is at least partially attached to the first spool around which the ribbon is wound.

Further, the ribbon cassette of the present invention includes a casing, and a first cassette in which an unused portion of the ribbon is wound.
a second spool disposed within the casing and wound with a used portion of the ribbon;
a ribbon cassette comprising an engagement member to be engaged by a drive member to the second spool to guide the ribbon from the first spool to the second spool; It is characterized by having a spring member mounted on the first spool.

Furthermore, the ribbon cassette of the present invention includes a casing, a first spool located in the casing and wound with an unused portion of the ribbon, and a second spool located in the casing and wound with a used portion of the ribbon. a ribbon cassette comprising a spool and an engaging member to be engaged with the second spool by a drive member to guide the ribbon from the first spool to the second spool, the first spool being rotated; a mounting member freely mounted; an insertion member inserted into the casing to engage with the first spool and suppress rotation of the first spool;
It is characterized by being included in the casing.

[For production]

According to the present invention, there is provided a ribbon cassette that prevents reverse rotation of a first spool and includes a reverse rotation prevention means that is located at least partially in the spool.

Compared to conventional ribbon cassettes, the anti-reverse rotation means are not located in a location that would increase the depth of the cassette, and the operating member of the means is relatively small compared to conventional anti-reverse rotation means. It is durable.

The means preferably comprises eleven sawtooth members forming part of or rigidly fixed on the spool and a second sawtooth member rotatably fixed to the spool, The members are engaged with each other such that the serrated members permit rotation of the spool in one direction (albeit with a slight restraint) and exert a greater restraint on rotation in the other direction. There is.

Preferably spring means are mounted for maintaining the serration member in engagement, the spring means or a portion thereof extending outwardly beyond the spool or beyond the outer surface of the spool axis.

However, it is advantageous for this spring means to be fixed on the spool rather than on the casing.

The ribbon cassette of the present invention further includes means for maintaining tension in the ribbon and for taking up any slight slack caused by discontinuous movement of the first spool. The means are fitted with a spring member mounted on the casing, around which the ribbon passes for adjusting the length of the ribbon's path through the casing.

According to the present invention, a ribbon cassette is provided having a spring member mounted on a first spool of the cassette for maintaining tension in the ribbon.

By placing the spring member on the first spool, a simpler casing structure can be used and the casing can be assembled more easily.

Furthermore, this construction allows for a greater degree of slack to be taken up, or the same degree of slack to be taken up more reliably, since a spring member of greater length can be used.

The cassette preferably also includes means for preventing reverse rotation of the first spool, which means preferably includes a spring member for providing a means for maintaining tension in the ribbon, at least in part.

Other problems encountered in transporting this ribbon cassette are:
The plfJ1 spool moves in the casing and the ribbon comes off the spool.

According to the present invention, there is further provided a casing having a mounting member on which a rotatable first spool is mounted; A ribbon cassette comprising an insert member is provided.

The casing preferably has a slot positioned to allow the insert member to engage into the boss of the casing on which the spool is mounted, and the insert member projects slightly beyond the periphery of the boss to fit into the slot. It is designed to engage.

The insertion member is capable of elastic deformation, and the insertion of the insertion member causes the deformation, and frictional engagement occurs between the insertion member and the casing under the elastic action of the insertion member, and the frictional force causes rotation of the spool. Preferably, the size is such that the insertion member can be held in the insertion position while suppressing the insertion.

The insertion member preferably comprises an operating part for suppressing rotation of the spool and an auxiliary part arranged outside the casing so that the operating part can be pulled out from the inserted position by grasping with the hand.

For example, the auxiliary parts should be accompanied by instructions such as ``remove them before use,'' so that the person operating them can understand! @1 It may be provided to indicate that it is necessary to remove the insert in order to rotate the spool.

Although the operating part and the auxiliary part may be substantially coplanar, it is preferable that they lie laterally on the casing when the insertion member is inserted into the operating position. The operating section is located on a plane that is approximately 90 degrees to the plane on which the auxiliary section is located.

〔Example〕

The details of the ribbon cassette of the present invention will be described below based on preferred embodiments with reference to the accompanying drawings, but the embodiments are illustrative of the present invention and are not intended to limit the present invention.

FIG. 1 is a plan view showing the ribbon cassette of this embodiment with a part of the casing removed; FIG. 2 is a vertical sectional view of the first spool showing details of means for preventing reverse rotation of the first spool; Figure 3 is a schematic perspective view showing the back of the cassette, and Figure 4 is! @1 A cross-sectional view showing the boss of the cassette on which the spool is placed after removing the spool from the boss and an insertion member for preventing rotation of the spool, FIG. 5 is a cross-sectional view of a plane orthogonal to FIG. 4, Figure 6 is a plan view seen from the direction of arrow A in Figure 4;
FIG. 7 is a side view showing a modification of the insertion member.

A ribbon cassette according to a preferred embodiment of the present invention includes a casing including a base 6, a first spool 8 wound with an unused portion of the ribbon, and a second spool 10 wound with a used portion of the ribbon. It is made up of. In addition, the said casing consists of two parts, and the base part 6 which is one part is shown in the drawing.

The second spool 10 is provided with an engagement member 12 which is to be engaged by drive means to a drive member in a word processor or computer printer, for example, through the gap between the spaced arms 13.14. The second spool 10 rotates and pulls the ribbon.

The first spool 8 rests on the hub 16 of the base 6 of the casing and is free to rotate.

The first spool 8 is hollow and has an upwardly directed annular surface 18 having a serrated ring 20 thereon as a first serrated member. 1 and spool 8, but if necessary, they may be formed separately and then integrated.

Above said annular surface 18 is located a second serrated member in the form of a bar 21 extending approximately diametrically within the hub 16, which bar 21 is connected to a diametrical slot 2 in the lower part of the hub 16.
4. It has a tongue 22 extending into the 4.

And, even if the first spool 8 rotates, this rod 21
The relative position with respect to the first spool 8 is maintained.

Further, the rod 21 has a wall portion 26 projecting upward from the rod 21 and having a slot. In the slot,
A spring member 28 is pressed into engagement with a restraining portion 30 which presses the rod 21 into engagement with the serrated ring 20.

The spring member 28 extends radially outward from the first spool 8, and an arm 32 is attached to the tip of the spring member 28, through which the ribbon guided from the WS1 spool 8 to the WS12 spool 10 is hung over its circumferential surface. .

The length and material of spring member 28 allows for some movement in arm 32 and allows movement of first spool 8 during use of the cassette.
It is sufficient that the ribbon is sufficient to remove the slack that occurs in the ribbon when it is guided from the ribbon to the second spool 10.

The serrated portion of the ring 20 and the shape, material, etc. of the rod 21 allow the first spool 8 to rotate in the first direction (clockwise in FIG. 1) under a slight restraining force. in the other direction (
It can be understood that it is sufficient to produce a fairly large restraining force against rotation in the clockwise direction.

According to this embodiment, it is possible to provide a ribbon cassette that has a simpler structure, is less expensive, and is relatively easy to assemble.

From the base 6 of the casing to the boss 16 on which the first spool 8 is placed, a linear slot 78 is provided along the diameter of the boss 16, and the slot 78 extends axially along a portion of the boss 16. (See Figure 4).

In this embodiment, an insertion member 80 consisting of an operating section 82 and an auxiliary section 84 is further provided. The dimensions of the operation section 82 are @
As shown in Figure 4, it can be inserted into the slot 78,
The size is such that it can protrude diametrically from the slot 78 in its inserted state. However, when the first spool 8 is placed on the boss 16, both side edges of the operating portion 82 of the insertion member 80 moving to the insertion position are connected to the inner peripheral surface of the f51 spool 8 as shown in FIG. The operating section 82 is elastically deformed by contacting the operating section 82. Such elastic deformation of the operating portion 82 maintains the frictional engagement between the insertion member 80 and the first spool 8 through the slot 78, and prevents rotation of the first spool 8 due to forces normally occurring during transportation. It also serves to hold the insertion member 80 in its insertion position.

As shown in FIGS. 4 and 5, the operating portion 82 and the auxiliary portion 84 may be located on substantially the same plane, but preferably the auxiliary portion 84 is placed on the casing as shown in FIGS. #IJ3 and 7. It is preferable that the auxiliary part 84 be placed horizontally along the outer surface of the cassette so as not to interfere with normal packaging. The user of the insert member 80 may be notified of the need to remove the insert member 80 before attaching it to the device. The secretary or the like can now use the cassette by raising the auxiliary part 84, pulling out the operating part 82 from the insertion position, and allowing the first spool 8 to rotate freely.

〔Effect of the invention〕

According to the ribbon cassette of the present invention, rotation of the first spool, which tends to occur during transportation, can be suppressed by making slight modifications to the existing cassette cassette without causing unnecessary cost increases during cassette assembly. This can prevent the tape from coming off the spool.

[Brief explanation of drawings]

The figures show a ribbon cassette as an embodiment of the present invention. Fig. 1 is a plan view of the ribbon cassette with a part of the casing removed, and Fig. 2 shows a ribbon cassette that prevents reverse rotation of the first spool. FIG. 3 is a schematic perspective view showing the back side of the cassette, and FIG. 4 is a longitudinal cross-sectional view of the first spool showing the means for
A sectional view showing the boss on which the spool is placed after being removed from the i-miss spool boss, and an insertion member for preventing rotation of the spool; FIG. 5 is a sectional view taken in a plane perpendicular to FIG. 4; FIG. is a plan view seen from the direction of arrow A in FIG. 4, and FIG. 7 is a side view showing a modification of the insertion member. 6. Base of casing, 8. First spool, 10.
・Second spool, 12...Engaging member, 13° 14...Arm, 16...Hub, 18...Upward annular surface, 20...
a serrated ring as a first serrated member, 21... a second serrated ring;
rod as a serrated member, 22...tongue, 24...slot, 26...wall, 28...spring member, 30...
・Press part, 32...Arm, 78...Slot, 80
...insertion member, 82..operation section, 84..auxiliary section.

Claims (12)

[Claims] (1) A casing, a first spool located in the casing around which an unused portion of the ribbon is wound, and a second spool located within the casing and around which a used portion of the ribbon is wound; , a ribbon cassette comprising an engaging member to be engaged with the second spool by a drive member to guide the ribbon from the first spool to the second spool, the cassette comprising a reverse rotation of the first spool; In order to prevent
A ribbon cassette comprising a reverse rotation prevention means mounted at least partially in the spool. (2) The reverse rotation prevention means includes a first sawtooth member that forms part of the first spool or is firmly attached to the first spool, and a first sawtooth member that is rotatably attached to the first spool. and a second sawtooth member, the sawtooth members being mutually connected to each other so as to permit rotation of the first spool in one direction and to generate a considerably large restraining force against rotation in the other direction. A ribbon cassette according to claim 1, wherein the ribbon cassette is engaged with the ribbon cassette of claim 1. (3) The ribbon cassette according to claim 2, further comprising a spring member for engaging the first and second sawtooth members with each other. (4) The ribbon cassette according to claim 3, wherein the spring member is provided on the first spool. (5) A casing, a first spool located in the casing and wound with an unused portion of the ribbon, and a second spool located in the casing and wound with a used portion of the ribbon; a ribbon cassette comprising an engaging member to be engaged by a drive member to the second spool for guiding the ribbon from the first spool to the second spool, the cassette comprising: A ribbon cassette comprising a spring member mounted on the first spool. (6) The ribbon cassette according to claim 5, wherein the spring member constitutes at least a part of a means for preventing reverse rotation of the first spool. (7) The ribbon cassette according to claim 6, wherein the spring member is for engaging the first and second sawtooth members with each other. (8) A casing, a first spool located in the casing and wound with an unused portion of the ribbon, and a second spool located in the casing and wound with the used portion of the ribbon, and , the first spool is rotatably mounted in a ribbon cassette, the ribbon cassette having an engaging member to be engaged with the second spool by a drive member to guide the ribbon from the first spool to the second spool; and an insertion member inserted into the casing to engage with the first spool and suppress rotation of the first spool, the casing is characterized in that ribbon cassette. (9) The casing has a slot positioned so that the insertion member can be engaged with the boss of the casing on which the first spool is placed, and the insertion member extends beyond the periphery of the boss. 9. The ribbon cassette of claim 8, wherein the ribbon cassette is adapted to protrude slightly and engage the slot. (10) The insertion member is capable of elastic deformation, and the elastic deformation occurs upon insertion of the insertion member, and frictional engagement occurs between the insertion member and the casing under the elastic action of the insertion member. 10. The ribbon cassette according to claim 9, wherein the ribbon cassette has a size such that the rotation of the first spool can be suppressed by the frictional force and the insertion member can be held at the insertion position. (11) The insertion member includes an operating section for suppressing rotation of the first spool, and an auxiliary section disposed outside the casing so that the operating section can be pulled out from the insertion position by grasping with a hand. A ribbon cassette according to claim 8, comprising: a ribbon cassette according to claim 8; (12) The ribbon cassette according to claim 11, wherein the operating section is located on a plane that makes approximately 90 degrees to a plane on which the auxiliary section is located.