JPH0664847A - Ribbon body spool attachment structure - Google Patents

Abstract

(57) [Abstract] [Purpose] With respect to a structure for fastening a ribbon body to a spool, the ribbon body is easily fastened to the spool without using a special fastening member such as a double-sided adhesive tape. [Structure] A spool 14 is provided with a shaft portion 14 that serves as a ribbon body winding portion.
The spool body is formed of a spool body 10 having a ribbon body insertion slit 15 and a clamper insertion slit 16 formed on the outer peripheral surface thereof, and a clamper 11 having a main portion 17 extending in the axial direction and a ribbon body pressing portion 18 having elasticity. A fitting concave portion 24 for fitting with the ribbon body pressing portion 18 of the clamper is provided on the inner surface of the shaft portion of 10, and the clamper inserting slit 16 is formed after the end portion 29a of the ribbon body is inserted into the ribbon body inserting slit 15 of the spool body 10. From the clamper 11, the ribbon body pressing portion 18 and the fitting recess 24 of the clamper 11 are inserted.
By fitting and, the end portion 29a of the ribbon body is sandwiched and held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel structure for fastening a ribbon body to a spool. More specifically, it relates to a structure in which the end of the ribbon body is fixed to a spool around which the ribbon body is wound, and the ribbon body can be easily and securely attached to the spool without using a ribbon body fixing member such as double-sided adhesive tape. The present invention is intended to provide a structure for fixing a ribbon body to a spool that can be fixed to the spool.

[0002]

2. Description of the Related Art For example, in an ink ribbon cartridge used in a printer, a supply spool having an ink ribbon wound in a case and a take-up spool for winding an ink ribbon fed from the supply spool rotate. In such an ink ribbon cartridge, it is necessary to fix both ends of the ink ribbon to the supply spool and the take-up spool, respectively.

Therefore, it is common practice to attach the end of the ink ribbon to the spool by using a fastening member such as a double-sided adhesive tape.

In FIG. 6, a is a spool having a substantially cylindrical shape, flanges b and b are formed at both ends thereof, and an ink ribbon winding portion c is formed between the flanges b and b. .

Reference numeral d denotes an ink ribbon, the end portion e of which is adhesively fixed to the ink ribbon winding portion c of the spool a by a double-sided adhesive tape f.

[0006]

However, when the end portion e of the ink ribbon is fixed to the spool a by the above-described method, a fixing member such as the double-sided adhesive tape f is additionally required. Therefore, there are problems that the number of parts is increased and the cost is increased.

Further, since the end portion e of the ink ribbon d has to be fixed to the spool a after affixing member such as the double-sided adhesive tape f is applied or adhesive is applied to the spool a, the ink ribbon d is spooled. There is also a problem that it is difficult to attach the ink ribbon straightly to a and the process of assembling the ink ribbon cartridge becomes complicated.

Further, the end portion e of the ink ribbon d is attached to the surface of the ink ribbon winding portion c of the spool a by a double-sided adhesive tape f.
However, there is also a drawback that it is easily peeled off due to a decrease in adhesive strength due to temperature changes or changes over time, etc.

[0009]

In order to solve the above problems, a structure for fastening a ribbon body to a spool according to the present invention includes a clamper comprising a main portion extending in an axial direction and a ribbon body pressing portion having elasticity. A spool body in which a ribbon body insertion slit extending in the axial direction and a clamper insertion slit extending in the axial direction at a position spaced from the ribbon body insertion slit in the axial direction are formed on an outer peripheral surface of a shaft portion which is a ribbon body winding portion. A spool is formed from the spool body, and a fitting recess into which the ribbon body pressing portion of the clamper fits is provided on the inner surface of the shaft portion facing the clamper insertion slit of the spool body, and the ribbon body insertion slit of the shaft portion of the spool body is provided with the ribbon body. After inserting the end portion of the clamper, the clamper is inserted from the clamper insertion slit and the ribbon body pressing portion of the clamper is fitted into the fitting recessed portion. The ends of the ribbons between the inner surface of the pressing portion and the spool body is obtained so as to hold clamping.

[0010]

Therefore, in the structure for fixing the ribbon body to the spool of the present invention, the ink ribbon is inserted into the ink ribbon insertion slit formed at the shaft portion of the spool body which is the ink ribbon winding portion of the spool body. Since it is sandwiched between the fitting concave portion on the inner surface of the shaft portion and the ink ribbon pressing portion of the clamper and attached to the spool, an ink ribbon fastening member such as a double-sided adhesive tape as a separate member is unnecessary, It contributes to cost reduction and resource saving, and is not affected by temperature changes or changes over time like when using double-sided adhesive tape, etc., and the ribbon body falls off the spool or its position shifts. There is nothing to do.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the structure for fastening the ribbon of the present invention to the spool will be described below with reference to the illustrated embodiments.

1 to 6 show an example of an embodiment of a structure for fastening a ribbon body of the present invention to a spool.

In the illustrated embodiment, the present invention is applied to a structure for fixing an ink ribbon to a spool in an ink ribbon cartridge.

Reference numeral 1 is an ink ribbon cartridge.

Reference numeral 2 designates a case made of synthetic resin, and two spool accommodating portions 3 and 3'having one end opened and the other end closed are connected by connecting portions 4 and 4'near both ends thereof. Are formed integrally with each other in parallel and spaced apart from each other.

Slits 5 and 5'extending in the axial direction are formed on both side walls of the spool accommodating portions 3 and 3'on opposite sides, leaving both ends.

On the inner surfaces of the spool accommodating portions 3 and 3 ', ridges 6 and 6'protrude over the entire circumference at a position near the opening end (front side).

The case as described above is divided into upper and lower halves, and the halves 7 and 8 are abutted on each other and joined together.

Reference numerals 9 and 9'indicate substantially cylindrical supply-side and take-up-side spools, each of which comprises a spool body 10 and a clamper 11.

The spool body 10 has a substantially cylindrical shape, and the flanges 12 and 1 are not so large in protrusion amount at two positions, one near the other end and one near the other end.
3 are integrally formed, and these flanges 12 and 13 are formed.
The portion between the and is the shaft portion 14 that serves as the ink ribbon winding portion.

An axially long ink ribbon insertion slit 15 is formed on the shaft portion 14 of the spool body 10, and the ink ribbon insertion slit 15 is circumferentially formed at a central angle from the position where the ink ribbon insertion slit 15 is formed. At positions separated by 90 degrees, a clamper insertion slit 16 is formed in parallel with the ink ribbon insertion slit 15 so that the clamper insertion slit 16 has an axial length slightly shorter and a width wider than the ink ribbon insertion slit 15.

As shown in FIG. 3, the clamper 11 has a substantially arcuate shape with a main part 17 which is long in the axial direction, and both ends of the clamper 11 are integrally connected to the vicinity of both ends of the main part 17 and have elastic ink. The ribbon pressing portion 18 is provided.

At one end surface of the main portion 17 in the axial direction, the peripheral surface 17a of the main portion 17, that is, the surface opposite to the side where the ink ribbon pressing portion 18 is attached, is attached to the spool body 10. A surface that matches the circumferential surface of the shaft portion 14 when worn,
From the position toward the ink ribbon pressing portion 18, a locking piece 19 axially protruding from a position displaced by the wall thickness of the shaft portion 14 of the spool body 10, and an engaging piece 19 also axially protruding to the other end portion. The joint portions 20 are integrally formed.

The engaging portion 20 has a substantially U shape when viewed from the circumferential direction, and one end thereof is integrally connected to the inner side surface 17b of the main portion 17, that is, the other end portion of the surface opposite to the peripheral surface 17a. And an engaging head portion 22 integrally connected to the other end of the elastic portion 21. The outer end surface 22a of the engaging head portion 22 is an extension surface of the peripheral surface 17a of the main portion 17. Located on top. The outer end surface 22 is provided on the surface of the engaging head 22 on the side opposite to the main portion 17.
A locking piece 22b is integrally projected from a position displaced by a thickness of the shaft portion 14 of the spool body 10 from a, and a release recess 23 is provided at an end of the outer end surface 22a on the locking piece 22b side. Has been formed.

A fitting recess 24 is formed on the inner surface of the peripheral wall of the shaft portion 14 of the spool body 10 facing the clamper insertion slit 16. The fitting recessed portion 24 is provided with two ridges 25, 25 extending in parallel in the axial direction while keeping a width in the circumferential direction, which is wider than the width of the ink ribbon pressing portion 18 of the clamper 11, that is, a size in the circumferential direction. It is formed by doing.

A portion 26 of the spool body 10 from one flange 13 to one end thereof is a driven portion, and the driven portion 26 is formed with a connecting concave portion 27 having an opening at one end. Engaging projections 28, 28, ... Extending in the axial direction are formed in an array on the inner peripheral surface of the recess 27 at regular intervals in the circumferential direction.

Therefore, when the ink ribbon cartridge 1 is connected to a device such as a printer, the drive shaft (not shown) of the device is fitted into the coupling recesses 27, 27 of the driven parts 26, 26 of the spools 9, 9 '. Are connected together.

Reference numeral 29 is an ink ribbon, and both end portions 2
9a and 29b are fixed to the spools 9 and 9'by a method described later, and most of them are wound around the supply side spool 9.

Then, the spool 9 of the ink ribbon 29,
The part located between the spool storage part 3 and 3'is exposed through the slits 5 and 5'of the spool storage parts 3 and 3 '.

Therefore, the spools 9 and 9'combined with the above-mentioned members are rotatably accommodated in the spool accommodating portions 3 and 3'of the case 2, and the respective flanges 13 and 13 are spool accommodating portions. 3, 3'ridge 6,
Located inside 6 ', which allows the spool 9, 9'
Does not fall out of case 2.

The assembly of the spool 9 or 9'and the fastening of the both ends 29a, 29b of the ink ribbon 29 to the spool 9, 9'are carried out as follows.

First, the end portion 29a or 29b of the ink ribbon 29 is inserted into the ink ribbon insertion slit 15 of the spool body 10 until its end portion comes into contact with the inner wall 14 of the shaft portion of the spool body 10.

Then, the clamper 11 is inserted into the clamper insertion slit 16 from the ink ribbon pressing portion 18, and the main portion 1
The engaging piece 19 at one end of 7 is engaged with the inner edge of one end of the clamper insertion slit 16, and in this state, the space between both ends of the elastic portion 21 at the other end is contracted, that is, the engaging head 22 makes the main portion 17 The engaging head 22 through the other end of the clamper insertion slit 16 so as to contact the other end of the engaging head 22.
When b passes through the other end of the clamper insertion slit 16 and the force that contracts between the both ends of the elastic portion 21 is removed, the elastic portion 21 tries to restore to its original state and the both ends open, and the locking is achieved. The piece 22b engages with the inner edge of the other end of the clamper insertion slit 16.

Further, the ink ribbon pressing portion 18 except for a certain amount of both ends thereof is fitted in a fitting recess 24 formed on the inner peripheral surface of the shaft portion 14 of the spool body 10 so as to have an end portion 29a of the ink ribbon 29. Or it is fitted via 29b.
In this state, the ink ribbon pressing portion 18 is in a slightly bent state, and the repulsive force generated by this causes the end portion 29a or 29b of the ink ribbon 29 to fall between the ink ribbon pressing portion 18 and the inner peripheral surface of the spool body 10. It is firmly clamped by, and each locking piece 19, 22b of the clamper 11
Is securely engaged with both ends of the clamper insertion slit 16.

Contrary to the case where the ink ribbon 29 is attached to the spool 9 or 9'as described above, when replacing the ink ribbon 29, the clamper 11 can be removed from the spool body 10 as shown in FIG. , A sharp tip, such as the tip 30 of a mechanical pencil, is inserted into the release recess 23 of the engaging head 22 of the clamper 11 to prevent the elastic head 21 from repulsive force. Part 17
If it is moved to the other end side, the engagement between the locking piece 22b and the other end of the clamper insertion slit 16 is released, and the elasticity of the ink ribbon pressing portion 18 causes the clamper 11 to be slanted outward from the clamper insertion slit 16. Therefore, the clamper 11 can be removed by tilting the clamper 11 and pulling out the clamper 11, and the end portion 29a or 29b of the ink ribbon 29 can also be pulled out from the ink ribbon insertion slit 15.

[0036]

As is apparent from the above description, in the structure for fastening the ribbon body of the present invention to the spool, the end portion of the ribbon body is fastened to the spool around which the strip-shaped ribbon body is wound. A structure for fastening a ribbon body to a spool, wherein the spool comprises a clamper composed of a main portion extending in the axial direction and a ribbon body pressing portion having elasticity, and a shaft on the outer peripheral surface of the shaft portion serving as the ribbon body winding portion. A spool body formed with a ribbon body insertion slit extending in the direction and a clamper insertion slit extending in the axial direction at a position spaced from the ribbon body insertion slit in the circumferential direction, and an axis facing the clamper insertion slit of the spool body. The inner surface of the portion is provided with a fitting recess into which the ribbon body pressing portion of the clamper is fitted, and after the end portion of the ribbon body is inserted into the ribbon body insertion slit of the shaft portion of the spool body, it is closed. By inserting the clamper from the damper insertion slit and fitting the ribbon body pressing portion of the clamper into the fitting recess, the end portion of the ribbon body is clamped between the ribbon body pressing portion of the clamper and the inner surface of the spool body. Characterized by holding.

Therefore, in the structure for fixing the ribbon body to the spool of the present invention, the ink ribbon is inserted into the ink ribbon insertion slit formed in the shaft portion of the spool body, which is the ink ribbon winding portion. Since it is sandwiched between the fitting concave portion on the inner surface of the shaft portion and the ink ribbon pressing portion of the clamper and attached to the spool, an ink ribbon fastening member such as a double-sided adhesive tape as a separate member is unnecessary, It contributes to cost reduction and resource saving, and is not affected by temperature changes or changes over time like when using double-sided adhesive tape, etc., and the ribbon body falls off the spool or its position shifts. There is nothing to do.

Further, since the spool composed of the spool body and the clamper can be disassembled again, it is possible to easily replace only the used ink ribbon with a new one, which is also resource saving. You can contribute.

The specific structures or shapes of the respective parts shown in the above embodiments are merely examples for embodying the present invention, and the technical scope of the present invention is limited by these. Not interpreted.

[Brief description of drawings]

FIG. 1 is a perspective view showing an ink ribbon cartridge to which an example of implementation of a structure for fastening a ribbon body to a spool of the present invention is applied.

FIG. 2 is a horizontal sectional view of the ink ribbon cartridge of FIG.

FIG. 3 is an enlarged perspective view showing the spool in a disassembled state.

FIG. 4 is a cross-sectional view showing a state in which a clamper is attached to a spool body with a part cut away and enlarged.

5 is an enlarged cross-sectional view taken along the line VV of FIG.

FIG. 6 is a partially cutaway and enlarged cross-sectional view showing a method for removing the clamper from the spool body.

FIG. 7 is an enlarged perspective view showing a state in which a conventional ink ribbon is fixedly attached to a spool.

[Explanation of symbols]

 9, 9'spool 10 spool body 11 clamper 14 shaft portion (of spool body) 15 ribbon body insertion slit 16 clamper insertion slit 17 (clamper) main portion 18 (clamper) ribbon body pressing portion 24 fitting recess 29 ribbon body 29a, 29b Ends of ribbon body

Claims (4)

[Claims] 1. A structure for fixing a ribbon body to a spool, wherein an end of the ribbon body is fixed to a spool around which a ribbon-shaped ribbon body is wound, wherein the spool is elastic with a main portion extending in an axial direction. A clamper comprising a ribbon body pressing portion having
A spool body in which a ribbon body insertion slit extending in the axial direction and a clamper insertion slit extending in the axial direction at a position distant from the ribbon body insertion slit in the circumferential direction are formed on the outer peripheral surface of the shaft portion which is the ribbon body winding portion. The spool body is provided with a fitting concave portion on the inner surface of the shaft portion facing the clamper insertion slit of the spool body into which the ribbon body pressing portion of the clamper is fitted. Between the ribbon body pressing portion of the clamper and the inner surface of the spool body by inserting the clamper from the clamper insertion slit after inserting the end portion of the ribbon body and fitting the ribbon body pressing portion of the clamper into the fitting recess. The structure for fastening the ribbon body to the spool is characterized in that the end portion of the ribbon body is sandwiched and held by. 2. A clamp part is formed at one axial end of the main part of the clamper, and another lock part is formed at the other end via an elastic part, and the clamper is spooled by these two lock parts. The structure for fixing a ribbon body to a spool according to claim 1, wherein the ribbon body is locked to the main body. 3. A release recess, which serves as a hook for a tool or the like when releasing the locking relationship with the spool body, is provided in the locking portion formed via the elastic portion of the clamper. Item 3. A structure for fastening a ribbon body to a spool according to Item 2. 4. The ribbon body pressing portion of the clamper has a substantially arcuate shape, and both end portions thereof are integrally connected to both end portions of the main portion of the clamper.
The structure for fastening the ribbon body to the spool described in.