JP2014210388A - Winding reel, and winding reel support mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding reel and a winding reel support mechanism in which replacement of a belt-like body such as an ink ribbon and a recording medium wound into a roll can be smoothly and easily performed and even a large diameter belt-like body can be smoothly rotated.SOLUTION: A winding reel 1 includes: a first engagement recess part 4 that is formed in a cone-shape having a plurality of inclination grooves 4a and engages with a first engagement protrusion part; and a rotary core 2 which has second engagement recess parts 5 to engage with second engagement protrusion parts at both ends respectively and around which a belt-like body is wound. When mounted, a rib of the first engagement protrusion part fits into the groove 4a of the first engagement recess part 4, and the second engagement protrusion part engages with the second engagement recess part 5.

Description

In particular, the present invention enables smooth and simple replacement of a belt-like member such as a recording medium such as an ink ribbon or a label wound in a roll used in a printer such as a thermal transfer printer, and has a large diameter. The present invention relates to a winding reel and a winding reel support mechanism that enable smooth rotation even for a belt-like body.

  2. Description of the Related Art Conventionally, a thermal transfer printer that prints on a recording medium such as a continuous label using a transfer film is known, and supports a paper tube as a “take-up reel” with a pair of paper tube holders. And a transfer film (ink ribbon) is wound around the paper tube (see, for example, Patent Document 1).

First, an example of a thermal transfer printer will be described with reference to FIG. 8. A thermal transfer printer (printer) 51 includes a recording medium supply unit 52, a printing unit 53, a ribbon supply unit 54, and a ribbon take-up unit 55. .
The recording medium supply unit 52 is provided with a supply shaft 57 that rotatably supports a recording medium 56 such as a roll-like continuous label.
The printing unit 53 includes a platen roller 58 and a thermal head 59, and the platen roller 58 is provided so as to be rotationally driven by a drive source (not shown).
The ribbon supply unit 54 and the ribbon winding unit 55 are provided above the printing unit 53 and hold a transfer film (ink ribbon) 60.
Then, the ink ribbon 60 fed out from the ribbon supply unit 54 is transferred to the printing unit 53 through the guide roller 61. In the printing unit 53, the ink ribbon 60 is superimposed on the surface of the recording medium 56 transferred from the recording medium supply unit 52 via the guide roller 62, and the ink is generated by the heat generation of a heating element (not shown) of the thermal head 59. The ink on the ribbon 60 is transferred to the recording medium 56 to perform desired printing.
The printed recording medium 56 is fed forward from the issuing port 64, and the transferred ink ribbon 60 is transferred upward through the guide roller 63 and taken up by the ribbon take-up unit 55.

The paper tube holding device of Patent Document 1 is provided in the thermal transfer printer (printer) 51 as described above, and supports the left and right sides of the paper tube rotatably by the paper tube holder, and one of the paper tube holders is a motor. In which a transfer film (ink ribbon) or the like mounted on a paper tube is wound up, a notch is provided on one side of the paper tube (winding reel), and the paper tube holder And a claw plate that is elastically supported in the axial direction and has a claw that is detachable from the cutout portion.
Then, the claw plate is slid in the circumferential direction by driving the motor, so that the claw is inserted into the notch portion of the paper tube (“Claims” of the same document).

  By the way, in the thermal transfer printer 51, the ink ribbon 60 is exchanged in addition to the recording medium 56 consumed by printing / issuance. In addition, there is a demand for making it easy to do so, and the recording medium 56 and the ink ribbon 60 tend to be enlarged in order to meet the decrease in the number of replacements.

However, when the recording medium 56 and the ink ribbon 60 are increased in size, the recording medium 56 and the ink ribbon 60 wound in a roll shape become heavier as the roll diameter becomes larger. Therefore, the conventional paper tube holding device cannot withstand such a problem.
That is, a claw is inserted into the notch portion of the paper tube, and the paper tube around which the recording medium 56 and the ink ribbon 60 are wound is fed out by a motor. Therefore, there is a problem that the notch may be damaged.
The same applies to the case where the recording medium 56 and the ink ribbon 60 that have been fed out are wound up. When the rolled-up roll diameter increases, the roll becomes heavier and the cutout portion is easily damaged.

When the user replaces the recording medium 56 or the ink ribbon 60, the recording medium 56 or the ink ribbon 60 that has become large and heavy is supported by one hand and the nail plate is pushed outward in the axial direction. The claw plate is slid in the circumferential direction by driving the motor by hand (operating a switch or the like), and the claw is inserted into an appropriate position where the notch portion of the paper tube is formed. Alternatively, it is necessary to mount the ink ribbon 60, and it is necessary to perform two operations for inserting the nail into the notch portion of the paper tube by pushing the nail plate and turning the motor. there were.

Japanese Patent Laid-Open No. 2-62352

The present invention has been made paying attention to the above problems, and it is possible to smoothly and easily replace a belt-like member such as a recording medium wound around a roll or an ink ribbon, and to form a large-diameter belt-like member. It is an object of the present invention to provide a winding reel and a winding reel support mechanism that can smoothly rotate even a body.

The winding reel according to the present invention is provided so as to be rotatable by a rotation drive source, and has a first engagement member in which a plurality of ribs are formed on a truncated cone-shaped slope provided so as to protrude from the first support member. A second convex member that protrudes from the second support member provided at a desired distance from the joint convex portion and the first support member, and that is provided in a conical shape facing the first engagement convex portion. A winding reel detachably provided to a printer provided with a mating convex portion, the winding reel having a plurality of inclined grooves and being formed in a mortar shape, The first engagement recess that engages with the first engagement projection and the second engagement recess that engages with the second engagement projection are provided at both ends, and the belt-like body is wound around the first engagement recess. A rotating core that fits the rib of the first engaging convex part and the groove of the first engaging concave part at the time of mounting. Said second engagement recess and a second engagement protrusion is characterized by being configured to engage.
Further, the winding reel can be provided with a flange for regulating the side surface of the belt-like body to be wound at at least one end portion of the rotating core.

A winding reel support mechanism according to a second aspect of the present invention includes a support member that removably supports a winding reel on which the belt-like body is wound, and winds up the belt-like body attached to the support member. Alternatively, it is a winding reel support mechanism that performs feeding, wherein the support member is formed with a plurality of ribs on a truncated cone-shaped slope, and is provided with a first engagement mechanism that can be rotated by a rotation drive source. A first support member provided with a projecting convex portion and a desired distance from the first support member, and a frustoconical second member facing the first engaging convex portion. And a second support member provided with an urging means for urging the second engaging convex portion toward the first engaging convex portion. The winding reel has a plurality of inclined grooves and is formed in a mortar shape. A rotary core having a first engagement recess engaging with the projection and a second engagement recess engaging with the second engagement projection at both ends and around which the belt-like body is wound is provided. At the time of mounting, both end portions of the rotary core are pushed between the first and second support members along the inclined surfaces of the first and second engaging convex portions having a truncated cone shape, and the biasing force of the biasing means The second engaging convex portion is retracted to fit the first engaging convex portion and the first engaging concave portion, and the second engaging convex portion and the second engaging convex portion are engaged with each other. The winding recess is mounted by engaging the engaging recess.

Moreover, the guide flange part which contact | abuts the slope of the 1st and 2nd engagement convex part can be formed in the both ends of a rotation core.

The winding reel of the present invention is formed in a mortar shape having a plurality of inclined grooves, and is engaged with a first engaging convex portion that is rotatably provided by a rotational drive source. And a rotating core around which the belt-like body is wound. The ribs of the engaging projections of the first and second engaging recesses of the rotary core are engaged with the ribs of the first engaging concave portion of the rotary core. Therefore, when the winding reel is pushed in, both end portions of the rotating core abut against the inclined surfaces of the first and second engaging convex portions having a truncated cone shape, and the winding reel slides along the inclined surface. Therefore, the first engagement convex portion having a rib and the first engagement concave portion having a groove are fitted to each other. Therefore, the rotation is possible to improve the rotational force is transmitted without loss, there is an effect that the synchronization of the rotation is taken not idle.
Furthermore, if at least one end portion of the rotary core of the winding reel is provided with a flange for regulating the side surface of the wound belt-like body, it is possible to prevent the belt-like body from shifting during attachment and detachment.

  A winding reel support mechanism according to a second aspect of the present invention includes a first support member that protrudes from a first engagement convex portion that is rotatably provided by a rotation drive source, A biasing means is provided which is provided with a frustoconical second engaging convex portion facing the engaging convex portion, and urges the second engaging convex portion toward the first engaging convex portion. A first engagement member that is formed in a mortar shape having a plurality of inclined grooves and that engages with the first engagement convex portion. Constructed by a winding reel having a recess and a second engaging recess that engages with the second engaging projection at both ends and having a rotating core around which the belt-like body is wound. Both end portions of the rotating core are pushed between the first and second support members along the slopes of the trapezoidal first and second engaging convex portions, and the second engagement is performed against the urging force of the urging means. Convexity Is retracted, the first engaging convex portion and the first engaging concave portion are fitted, and the second engaging convex portion and the second engaging concave portion are engaged to mount the winding reel. When the winding reel is pushed in between the first engaging convex portion and the second engaging convex portion, it rotates on the inclined surfaces of the frustoconical first and second engaging convex portions. Both end portions of the core are in contact with each other and are pushed in while sliding on the slope, and the second engaging convex portion is retracted against the urging force of the urging means, and the gap between the first and second engaging convex portions is Since it is in a state of being spread out, it is easy to mount the winding reel, and the first engagement convex portion having the rib and the first engagement concave portion having the groove are fitted, so that rotation is wasted. Rotation is synchronized and rotation is prevented to prevent idle rotation. Further, when removing the winding reel, it is separated from the mounting position. When pulled in the direction, the first and second engagement recesses slide along the slopes of the first and second engagement projections, and the urging means moves backward, so that the removal is easy. .

In addition, if guide flange portions that contact the inclined surfaces of the first and second engaging convex portions are formed at both ends of the rotating core, the rotating core on which the guide flange portion is formed slides along the inclined surfaces. It becomes easy.

It is a schematic perspective view of the winding reel which concerns on this invention. It is the side view seen from the arrow II direction in FIG. It is the schematic perspective view seen from the direction of arrow III in FIG. FIG. 3 is a schematic front view of the support mechanism showing a state where the winding reel is mounted on the printer. FIG. 3 is a schematic enlarged perspective view showing a first engagement convex portion that is fitted to the winding reel. FIG. 5 is a schematic front view corresponding to FIG. 4 showing a procedure for mounting the winding reel on the support mechanism. FIG. 10 is a schematic perspective view showing a vicinity of a guide member of a first engagement convex portion that is a winding reel support mechanism according to another embodiment and is fitted to the winding reel. It is a schematic side view of a printer equipped with a conventional winding reel (paper tube).

(First embodiment)
Hereinafter, one embodiment of the present invention will be described with reference to FIGS.
In addition, below, the part similar to the past is attached | subjected to the same code | symbol, and detailed description is abbreviate | omitted.

As shown mainly in FIGS. 1 to 3, the winding reel 1 includes a rotating core 2 around which a recording medium 56 and an ink ribbon 60 are wound, and one end portion of the rotating core 2 (the left end portion in FIG. 1). ) And the flange 3 provided.
In the present embodiment, the recording medium 56 and the ink ribbon 60 are collectively referred to as a belt-like body R as appropriate.

The rotary core 2 is formed with a first engagement recess 4 at one end and a second engagement recess 5 at the other end.
As shown in FIGS. 1 and 2, the first engagement recess 4 mainly protrudes from one end of the rotary core 2 to form a cylindrical first guide flange 6, and this The cylindrical central portion of the first guide flange portion 6 has a plurality of inclined grooves 4a and is formed in a mortar shape.
Further, as shown in FIG. 3, the second engaging recess 5 mainly protrudes from the other end of the rotary core 2 to form a cylindrical second guide flange 6, and this second The cylindrical center portion of the guide flange portion 6 is formed in a cylindrical hole shape.

  The flange 3 is for supporting the side surface of the strip-shaped body R wound around the rotary core 2, and is formed of a synthetic resin such as plastic.

  The winding reel 1 is used as a “supply reel” by winding a predetermined amount of the belt-like body R around the rotary core 2, or the belt-like body R fed out from the “supply reel” is wound around the rotary core 2. Used as a take-up reel.

FIG. 4 shows an outline of a support mechanism in which a belt-like body R (shown by an imaginary line in the figure) is wound in advance on the winding reel 1 described above and used as a “supply reel” and mounted on the printer 51. It is a front view.
For convenience of explanation, the first and second support members 12 and 13 and the winding reel 1 described later are partially broken so that the inside can be seen.
The support mechanism 11 of the winding reel 1 is a second support that faces the first support member 12 in the width direction (arrow W direction) of the strip-shaped body R, which is separated from the first support member 12 by a desired distance. And a member 13.

A rotary shaft 14 that is rotated by a motor (not shown) as a “rotation drive source” is inserted into the first support member 12, and a first engagement convex portion is formed at the tip of the rotary shaft 14. 15 is rotatably provided.
The first engaging convex portion 15 is provided so as to protrude toward the second support member 13, and is mainly formed in a truncated cone shape as shown in FIG. Ribs 15a are formed. The ribs 15a are substantially the same in number and interval as the grooves 4a of the first engagement recesses 4, and the first engagement projections 15 having a truncated cone shape and a mortar-shaped first mortar-shaped first core. When the engaging recess 4 is engaged, the rib 15a and the groove 4a are fitted (details will be described later).

The second support member 13 is provided with a frustoconical second engagement convex portion 16 at a position facing the first engagement convex portion 15 and at the bottom (right end in FIG. 4). A spring 17 is provided as “biasing means” for urging the second engagement convex portion 16 toward the first support member 12.
When the winding reel 1 is inserted between the first engaging convex portion 15 and the second engaging convex portion 16, the first engaging concave portion 4 and the first engaging portion of the rotating core 2 are inserted. The mating convex portion 15 is engaged with the second engaging concave portion 5 and the second engaging convex portion 16 of the rotary core 2, and the winding reel 1 is moved by the biasing force of the spring 17. It is positioned and mounted between the first and second support members 12 and 13 (details will be described later).

Next, a procedure for mounting the winding reel 1 to the support mechanism 11 will be described mainly with reference to FIG.
In a state where the winding reel 1 is not mounted on the support device 11, the second engagement convex portion 16 provided on the second support member 12 is biased by the spring 17 as “biasing means” ( The first support member 13 is projected to stand by by the biasing direction of arrow F).
An operator (not shown) carries the winding reel 1 between the first and second support members 12 and 13 by holding the belt-like body R, the rotary core 2 and the like by hand, and performs the first and second engagements. The rotary core 2 is positioned in the vicinity of the convex portions 15 and 16.
That is, the first guide flange portion 6 formed at one end portion of the rotary core 2 is moved close to the first engagement convex portion 15 and the second engagement convex portion 16 is rotated. Each of the second guide flange portions 7 formed at the other end of the core 2 is positioned.
And the 1st and 2nd flange parts 6 and 7 formed in the both ends contact | abut the rotating core 2 of the winding reel 1 brought close to the 1st and 2nd engagement convex parts 15 and 16 so that it may contact | abut. Then push it closer together.
At this time, the first guide flange portion 6 is formed along the rib 15a formed on the inclined surface of the first engaging convex portion 15 formed in a truncated cone shape, and the second guide flange portion 7 is The second engagement is pushed in along the slope of the second engaging projection 16 formed in the shape of a truncated cone and is urged by the spring 17 toward the winding reel 1 (in the direction of arrow F). Since the joint protrusion 16 moves backward against the urging force (in the direction indicated by the arrow B), the space between the first and second engagement protrusions 15 and 16 expands (the retracted position of the second engagement protrusion 16). Is shown in imaginary lines).
If the pushing-in of the winding reel 1 is continued as it is, the first and second guide flange portions 6, 7 get over the first and second engagement projections 15, 16, and the first engagement recess of the rotary core 2. The first engagement convex portion 15 engages with the second engagement concave portion 5, and the second engagement convex portion 16 engages with the second engagement concave portion 5, and the first engagement is provided oppositely. Since the second engaging convex portion 16 is biased by the spring 17 toward the mating convex portion 4, the mounting position between the first and second support members 11, 12, more specifically, the first and second The winding reel 1 is mounted between the engaging projections 15 and 16.

In addition, although the winding reel 1 is described as “push in” between the first and second engaging convex portions 15 and 16 at the time of mounting, the first and second of the rotating core 2 are illustrated from above in FIG. When the guide flange portions 6 and 7 are abutted and positioned on the first and second engaging convex portions 15 and 16 and the holding force of the winding reel 1 that is supported is loosened, the first and second engaging portions Since the first and second guide flange portions 6 and 7 move downward along the slopes of the convex portions 15 and 16, the space between the first and second engaging convex portions 15 and 16 spreads. Even the winding reel 1 around which the large-diameter belt-shaped body R is wound can be mounted using the weight (self-weight).

Further, when the winding reel 1 is mounted, the one end portion side is provided with a rib 15 a of the engaging convex portion 15 provided at the tip of the rotating shaft 14 and a groove 4 a of the first engaging concave portion 4 of the rotating core 2. And the ribs 15a and the grooves 4a are engaged with each other by the concavo-convex shape. While being efficiently transmitted to the reel 1, idle rotation is prevented, and on the other end side, the second engaging convex portion 16 and the hole-shaped second engaging concave portion 5 of the rotary core 2 are engaged by line contact. It is easy to rotate.

Further, when the winding reel 1 is removed, the belt R and the rotating core 2 are held by hand and pulled in a direction away from the mounting position, along the slopes of the first and second engaging convex portions 15 and 16. The first and second engaging recesses 4 and 5 slide, and the second engaging recess 5 urged toward the first engaging recess 4 side is gradually retracted, so that removal is easy. .
At the time of removal, the winding reel 1 may be pressed / moved against the second support member 13 against the biasing force of the spring 17 and then pulled away from the mounting position.

  As described above, the desired distance from the first support member 12 is separated from the first support protrusion 12 having a truncated cone shape provided so as to protrude from the first support member 12 in the width direction W of the band-shaped body R. The winding reel 1 is protruded from the provided second supporting member 13 and between the second engaging convex portion 16 having a truncated cone shape provided so as to face the first engaging convex portion 15. When pushing in, the first and second guide flange portions 6 and 7 of the rotating core 2 abut against the inclined surfaces of the frustoconical first and second engaging convex portions 15 and 16, and the first and second The inclined surface formed from the thick diameter portion on the support member 12, 13 side toward the thin diameter portion on the tip (band-shaped body R side) is pushed in while sliding toward the thin diameter, and the second member Since the joint convex part 16 moves backward against the urging force of the spring (biasing means) 17, the first and second engaging convex parts 15. As a result, the first engaging convex portion 15 having the rib 15a and the first first engaging concave portion 4 having the groove 4a are fitted to each other, and the second engaging portion 15 is expanded. Since the engaging convex portion 16 and the second engaging concave portion 5 are engaged to support the winding reel 1, the mounting is simple.

  In addition, in the state where the winding reel 1 is mounted, the first support member 12 side has the rib 15a of the first engagement convex portion 15 provided at the distal end portion of the rotating shaft 14 and the second engagement concave portion 4. Since the rotation of the rotary shaft 14 is synchronized and transmitted to the winding reel 1 without waste, the rotational force is improved and the rotational force is improved, and idling is prevented. Therefore, even if the winding reel 1 has a large diameter, the belt-shaped body R can be smoothly fed out.

(Second Embodiment)
Next, a support mechanism according to another embodiment will be mainly described with reference to FIG.
In the following description, the same parts as those in the conventional and previous embodiments are designated by the same reference numerals, and detailed description thereof is omitted.
FIG. 7 is a schematic perspective view showing the vicinity of the ribbon take-up portion 55 (see FIG. 8), and shows an example in which the take-up reel 1 is used as a “take-up reel”.

As shown in the figure, a guide member 18 is formed on the first support member 12 so as to protrude from the side surface on the second support member 13 side.
The guide member 18 is formed with an opening 18a on the upper left side in the figure, and is formed in a convex shape that is inclined so that both ends are tapered from the opening 18a toward the first engagement convex portion 15. The first and second support members 12 and 13 are formed in a so-called drawstring bag shape so as to surround a half circumference on the opposite side (back side) to the opening 18a with the first engagement convex portion 15 interposed therebetween. It is a “guide means” for moving and guiding the winding reel 1 to the mounting position when the winding reel 1 is pushed in between.
That is, when the winding reel 1 is mounted between the first and second support members 12 and 13, the first guide flange portion 6 of the rotary core 2 is pressed against the opening 18a, and the back side (in the figure, When it is pushed in toward the lower right side, the winding reel 1 is guided by the tapered guide member 18 and guided to the first engagement convex portion 15, and the first engagement concave portion 4 and the first one at one end portion are guided. The second engaging concave portion 5 and the second engaging convex portion 16 at the other end are engaged, and positioned and mounted.

In addition, since the half circumference of the 1st engagement convex part 15, ie, the half circumference which opposes the opening 18a, is also surrounded by the guide member 18, when the winding reel 1 is pushed in, it will be pushed into the back | inner side further. There is nothing.
Also, when removing the belt-shaped body R and the rotating core 2 that have been wound up and pulled out obliquely to the upper left in the figure, the first and second engaging protrusions 15, 16 and the first and first 2 is disengaged from the engaging recesses 4 and 5, and the winding reel 1 can be easily removed along the guide member 18.

As described above, when the guide member 18 is provided, the first guide member 6 of the winding reel 1 is pressed and pushed into the opening 18a and is guided to the first engagement convex portion 15, so that it has a support. Even if it is a very large and heavy strip R, it can be smoothly attached and detached.
About another structure, an effect | action, and an effect, detailed description is abbreviate | omitted since it is the same as that of previous embodiment.

It should be noted that the configuration and operation of the above-described embodiment are examples, and it goes without saying that they can be changed as appropriate without departing from the spirit of the present invention.

R Band W W Direction F Energizing direction B Backward direction 1 Winding reel 2 Rotating core 3 Flange 4 First engaging recess 4a Groove 5 Second engaging recess 6 First guide flange 7 Second guide Flange portion 11 Support mechanism 12 First support member 13 Second support member 14 Rotating shaft 15 First engagement convex portion 15a Rib 16 Second engagement convex portion 17 Spring (biasing means)
18 Guide member 18a Opening 51 Thermal transfer printer (printer)
52 Recording Medium Supply Unit 53 Printing Unit 54 Ribbon Supply Unit 55 Ribbon Winding Unit 56 Recording Medium 57 Supply Shaft 58 Platen Roller 59 Thermal Head 60 Recording Film (Ink Ribbon)
61, 62, 63 Guide roller 64 Issuing port

Claims (4)

A first engagement convex portion provided with a plurality of ribs on a truncated cone-shaped slope provided so as to be rotatable by a rotation drive source and projecting from the first support member;
A second fringe having a truncated cone shape protruding from a second support member provided at a desired distance from the first support member and provided opposite to the first engagement convex portion; A winding reel provided detachably to the printer provided with
The winding reel is
A first engagement recess that engages with the first engagement protrusion and a second engagement protrusion that engages with the first engagement protrusion and has a plurality of inclined grooves. Two engaging recesses at both ends, and provided with a rotating core around which a belt-like body is wound,
At the time of mounting, the rib of the first engaging convex portion and the groove of the first engaging concave portion are fitted, and the second engaging convex portion and the second engaging concave portion are engaged. A winding reel characterized by being configured to perform.   2. The winding reel according to claim 1, wherein the winding reel is provided with a flange for restricting a side surface of the belt-like body to be wound at at least one end portion of the rotary core. A winding reel supporting mechanism for removably supporting a winding reel on which a belt-like body is wound, and for winding or unwinding the belt-like body attached to the support member;
The support member is
A plurality of ribs are formed on the truncated cone-shaped slope, and a first support member that protrudes and is provided with a first engagement protrusion provided rotatably by a rotation drive source;
A desired distance from the first support member is provided, and a frustoconical second engagement convex portion is provided opposite to the first engagement convex portion, and the second engagement is provided. And a second support member provided with a biasing means for biasing the convex portion toward the first engaging convex portion, and the winding reel is
A first engagement recess that engages with the first engagement protrusion and a second engagement protrusion that engages with the first engagement protrusion and has a plurality of inclined grooves. Two engaging recesses at both ends, and provided with a rotating core around which a belt-like body is wound,
At the time of mounting, both end portions of the rotary core are pushed between the first and second support members along the inclined surfaces of the frustoconical first and second engaging convex portions, and the biasing force of the biasing means is used. The second engaging convex portion is retracted to fit the first engaging convex portion and the first engaging concave portion, and the second engaging convex portion and the second engaging portion are engaged. A winding reel support mechanism, wherein the winding reel is mounted by engaging a mating recess.   4. The winding reel support mechanism according to claim 3, wherein guide flange portions that contact the inclined surfaces of the first and second engaging convex portions are formed at both ends of the rotating core. 5.

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