JP2525425Y2 - Bobbin for transfer film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bobbin for supplying a transfer film for transfer recording or a bobbin for winding the transfer film.

[Conventional technology]

Conventionally, as shown in FIGS.
, A supply-side bobbin 4 for holding the transfer film 3, a winding-side bobbin 5 for winding the transfer film 3, and the transfer film 3 pressed against the platen roller to perform transfer recording. 2. Description of the Related Art A transfer recording apparatus including a recording head 6 for performing recording is known. In this recording apparatus, the platen roller 2 rotates in the direction of the arrow, and the bobbin 5 on the winding side rotates in the direction of the arrow by a drive shaft (not shown) in synchronism therewith. Transfer recording is being performed. In addition, a transfer film cassette configured to house the transfer film 3 and the bobbins 4, 5 in a cassette case 7 is also used in order to easily mount the transfer film 3 on a recording device.

[Problems to be solved by the invention]

In such a transfer recording device, in the part of the use start of the transfer film 3, the winding diameter d ₁ of the transfer film on the bobbin 5 of the winding side as shown in Figure 10 (a) is small, the transfer film the portion of the end winding diameter d ₂ larger of the transfer film on the bobbin 5 of the take-up as shown in Figure No. 10 (b). The winding diameter of the transfer film on the supply side bobbin 4 is large at the beginning of use of the transfer film, but is small at the end of use. If the winding diameter is greatly different between the start and end of use of the transfer film, the torque balance of the drive shaft at the time of supply and winding of the transfer film cannot be maintained, and the fluctuation of the tension of the transfer film increases, resulting in printing trouble. (Color shift, wrinkles, etc.).

In order to solve this problem, it is conceivable to increase the outer diameter of the body for winding the bobbin transfer film. However, the bobbin is usually formed into an integral structure by molding a resin. However, some bobbins have a wall portion at both ends of the bobbin and cannot be formed into a hollow structure. In this case, the bobbin is formed by rod injection molding. However, if the outer diameter of the bobbin body is increased, the wall thickness increases, so that it takes a long time to cool the molding machine and the cycle time becomes longer. And the cost increases. Further, if the cooling is insufficient, the roundness and the parallelism decrease, and the dimensional accuracy deteriorates.

The present invention has been made in view of such a problem, and provides a transfer film bobbin that can be easily formed and has improved dimensional accuracy while increasing the outer diameter of a body portion on which the transfer film is wound. The purpose is to:

[Means for solving the problem]

The present invention relates to a transfer film bobbin integrally formed by molding a resin. In order to reduce the thickness of the entire body around which the transfer film is wound, the bobbin is provided in the axial direction of the bobbin almost all around the periphery of the body. A transfer film bobbin characterized in that a slit is provided in parallel with the above.

[Action]

In the present invention, even when the bobbin outer diameter is increased, the slit is formed in almost the entire outer periphery and the wall thickness is reduced due to the robbery, so that the cooling at the time of molding is performed promptly. Therefore, the molding cycle time can be shortened and the dimensional accuracy can be increased. In addition, by arranging the slits parallel to the axial direction of the bobbin, there is an area without slits in the axial direction around the bobbin,
By sticking the tip of the transfer film to that portion, the entire width of the transfer film can be stuck securely and easily without any wrinkles, so that the transfer film can be wound up without wrinkles. Even if a slit is formed in the outer periphery of the portion, there is no problem in winding the transfer film.

〔Example〕

FIG. 1 is a side view of a transfer film bobbin according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof. The bobbin indicated by reference numeral 10 is composed of a body 10A on which the transfer film is wound and shafts 10B at both ends thereof, and a plurality of slits 11 are formed in substantially the entire outer periphery of the body 10A in the axial direction of the bobbin. It is formed in parallel and steals meat. The slit 11 is formed large so as not to impair the strength required for the bobbin, and is formed so as not to have a thick portion. Although the shape is not particularly limited, it is preferable that the bobbin 10 is provided in a shape and direction that facilitates die cutting when the bobbin 10 is formed by injection molding. In the present embodiment, as shown in FIG. 2, a slit 11 facing left and right is provided so that the mold can be pulled right and left.

The bobbin 10 is used as a transfer film supply bobbin 4 in a transfer film cassette as shown in FIG.
And / or used as a bobbin 5 for winding a transfer film. The outer diameter of the body 10A of the bobbin 10 is selected as large as allowed.

The bobbin 10 having the above configuration is formed into an integral structure by injection molding of a resin. At the time of this molding, despite the fact that the outer diameter of the body 10A is large, since the meat is stolen by the slit 11, there is no thick part and cooling is performed promptly. This shortens the molding cycle time,
Since productivity is improved and cooling is sufficiently performed, roundness and parallelism are increased, and desired dimensional accuracy can be easily obtained.

When the bobbin 10 is used as the bobbins 4 and 5 in the apparatus shown in FIG. 10, the outer diameter of the body 10A on which the transfer film is wound is large. The difference from the transfer film winding diameter at the time is small, the torque balance of the drive shaft can be maintained, and printing trouble (color shift, wrinkles, etc.) can be prevented. When winding the transfer film around the bobbin 10,
The tip of the transfer film is stuck on the outer periphery of the body of the bobbin 10, but the slits 11 formed on the outer periphery of the bobbin are arranged in parallel to the axial direction of the bobbin, so there is an area without slits in the axial direction on the outer periphery of the bobbin. It is present, and the entire width of the transfer film can be securely and easily applied in a wrinkle-free state by sticking the leading end of the transfer film to that portion, so that the transfer film is wound up without wrinkles be able to.

The shape of the bobbin, the shape and number of the slits formed on the outer periphery of the bobbin body, and the like can be variously changed, and modifications thereof will be described below.

The bobbin 13 shown in FIGS. 3 and 4 comprises a body 13A and shafts 13B on both sides, and has a plurality of slits 14 in substantially the entire outer periphery of the body 13A. The slits 14 are deeper and larger in number than the embodiment shown in FIG. This configuration is more suitable when the outer diameter of the trunk 13A is large.

The bobbin 15 shown in FIGS. 5 and 6 also comprises a body 15A and shafts 15B at both ends, and two types of slits 16 and 17 are formed in substantially the entire outer periphery of the body 15A in parallel to the axial direction. ing. One of the slits 16 is a slit having a large width in the circumferential direction, and a plurality of slits are arranged at small intervals in the axial direction. The other slit 17 is a narrow slit. This configuration is more suitable when the outer diameter of the trunk 15A is small.

Although all of the above embodiments have shown bobbins having a muc structure, the present invention is not limited to this, and can be applied to bobbins having a hollow structure. FIGS. 7, 8, and 9 show an embodiment in that case. The bobbin 19 includes a body 19A for winding the transfer film, a shaft 19B at one end, and a connecting portion 19C at the other end. And has a hole 20 inside. Although the bobbin 19 has a hollow structure having a hole 20 inside, the inner diameter of the hole 20 cannot be made larger than a value determined by the structure of the connecting portion 19C. On the other hand, it is desirable that the outer diameter of the body portion 19A be as large as possible, and if it is made larger, the wall thickness becomes thicker and the formability deteriorates. In order to prevent this, also in this embodiment, a large number of slits 21 are formed substantially all around the outer periphery of the trunk portion 19A, and the meat is stolen. Thereby, the moldability when the bobbin 19 is injection-molded is improved, so that the productivity can be improved and the dimensional accuracy can be increased.

[Effect of the invention]

As described above, the bobbin of the present invention has a slit provided on almost the entire outer periphery of the body for winding the transfer film. The cooling speed during molding is rapidly increased, which shortens the molding cycle time, improves dimensional accuracy, and increases the outer diameter of the bobbin. This has the effect that printing troubles (color shift, wrinkles, etc.) can be prevented. In addition, since the slits are arranged parallel to the axial direction of the bobbin, there is an area without slits in the axial direction on the outer periphery of the bobbin. The entire width can be securely and easily pasted in a wrinkle-free state, so that the transfer film can be wound up without wrinkles. Also has the effect of not generating

[Brief description of the drawings]

FIG. 1 is a side view of a bobbin according to an embodiment of the present invention, FIG.
3 is a side view of a bobbin according to another embodiment of the present invention, FIG. 4 is a cross-sectional view thereof, FIG. 5 is a side view of a bobbin according to still another embodiment, and FIG. 7 is a side view of a bobbin according to still another embodiment of the present invention.
8 is a cross-sectional view of the bobbin cut along a plane including the center axis, FIG. 9 is a cross-sectional view of the bobbin cut along a plane perpendicular to the center axis, and FIG. 10 is a schematic side view of the transfer recording apparatus. Yes,
(A) shows the start of use of the transfer film, and (b) shows the end of use of the transfer film. 1 ... Recording paper, 2 ... Platen roller, 3 ... Transfer film, 4,5 ... Bobbin, 6 ... Recording head, 7 ... Cassette case, 10 ... Bobbin, 10A ... Trunk, 11 ... … Slit, 13 ……
Bobbin, 13A …… Body, 14 …… Slit, 15 …… Bobbin, 15A
..., trunk, 16, 17 ... slit, 19 ... bobbin, 19A ... trunk, 20 ... hole, 21 ... slit.

Claims (1)

(57) [Scope of request for utility model registration] 1. A bobbin for a transfer film, which is integrally formed by molding a resin, wherein the bobbin shaft is provided on substantially the entire outer periphery of the body in order to reduce the thickness of the entire body of the body on which the transfer film is wound. A bobbin for a transfer film, wherein a slit is provided in parallel to the direction.