JPS61238642A - Sheet-like material supply device - Google Patents

Abstract

PURPOSE:To make it possible to supply a film always under a constant tension, by utilizing variations in the stretching force by resilient members due to the diametrical change of a roller making in contact with the outer periphery of an ink film, and by utilizing the pulling torque in association with variations in the frictional force between a pushing member and a control member. CONSTITUTION:As an ink film 22 is drawn out, the outer diameter of the ink film 22 decreases. In this case, a roller 40 is made in contact with the ink film 22 so that the roller 40 also decrease in the diametrical direction along a guide groove 42. Accordingly, tension springs 37, 38 stretched between the roller 40 and a brake pad 36 decrease their pulling force to decrease the friction force between the brake pad 36 and a brake drum 35 so that the pulling torque for the ink film 22 is decreased. Simultaneously, the diameter of the ink film 22 also decreases, and therefore, even if the pulling torque for the ink film 22 decreases, the film may be fed always under a constant tension, thereby it is possible to enhance and stabilize the image quality thereof.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a sheet-like material supplying device that is used in a heat-transfer type recording device, etc., and in particular draws out a transfer sheet such as an ink film at a constant tension. be.

[Background of the invention]

Conventionally, methods for supplying ink film in this type of heat-transferring recording device include a method in which a brake disk is pressed axially with a spring against the flange of a rotating shaft of the ink film wound into a roll, and a method in which a brake disk is pressed axially with a spring against the flange of a rotating shaft of the ink film wound in a roll, and There is a method for installing electromagnetic brakes and controlling them electrically. Among these methods, the former method can be made smaller and lower in price, but it is impossible to maintain the tension constant against changes in the radial direction of the film.

Further, in the latter method, it is possible to supply the film with a constant tension, but there is a drawback that the use of an electromagnetic brake requires the addition of a control circuit to the device, making the device expensive.

An example of a patent for applying a constant tension to an ink film in a heat transfer type recording device is Japanese Patent Application Laid-Open No. 60-275.
There is a publication No. 80.

[Purpose of the invention]

An object of the present invention is to provide a sheet-like material supplying device that can always supply material at a constant tension without requiring any particular tension detection device.

[Summary of the invention]

In order to achieve the above object, the present invention provides a roller that contacts the outer periphery of an ink film wound in a spiral shape around a rotating shaft, moves in a direction perpendicular to the rotating shaft to follow the change in diameter of the ink film, A braking member is provided on a shaft that rotates around the rotation axis, an elastic body for pressing a pressing member against the braking member is attached to the shaft support portion, the pressing member and the roller are stretched between the elastic body, and the The present invention is characterized in that the film is fed with a constant tension by changing the frictional force between the pressing member and the braking member by utilizing the change in the tension force of the elastic body due to the change in the radial direction of the roller.

[Embodiments of the invention]

An outline of a thermally rotating rectangular recording apparatus to which the apparatus of the present invention is applied is shown in FIG. 1 below.

The external shape of the device is composed of a bottom plate 1, a lower frame 2, and an upper frame 3. The lower frame 2 and the upper frame 3 are connected by a hinge pin 4 at the rear of the device, and the upper frame can be opened and closed up and down using the hinge pin 4 as a fulcrum. I have to.

The mechanism section includes a paper feed section, a film section, and a thermal head section. The paper feed unit includes a tray 8 that stores paper to be transferred such as cut paper for recording (hereinafter referred to as paper), a row 29 that takes out the paper, and a roller 10 that prevents feeding of two sheets of paper.
, 11, rollers 12 and 13 that hold the paper in the middle, guides 14, 15, and 16 that guide the paper, a platen roller 217 that transports the paper during recording, and a platen roller 17 to obtain the transport force for the transferred paper. Rows 218 and 19 that press down the paper between them, a guide 20 that guides the ejection of the paper after recording, and a guide 20 that guides the return direction of the paper when returning the paper in the opposite direction to the recording direction during multicolor recording. The guide 21 is made up of many parts.

The film section includes an ink film 22 of transfer paper having an ink material applied in a solid form on the film, and an ink film supply row 223 that supplies the ink film 22.
, a take-up roller 24 that winds up the film after recording, and rows 225, 26, and 27 that transport the ink film 22.

The thermal head section melts the ink material on the ink film 22 from the back side of the film by heat, and transfers the ink onto the paper.The thermal head section applies a pressure contact force that presses the thermal head to the ink film and the paper to the platen row 217. A spring 29, a spring 30 that overcomes the pressure force of the spring 29 and generates a force to separate the thermal head from the platen roller 17, a bar 31 that transmits the force generated by the spring 30 to the spring 29, overcomes the force of the spring 30, It is composed of a direct acting solenoid 32, a link bar 33, and a link hinge 34, which act on the bar 31 with or without the force of the spring 30 acting on it.

The head section and rollers 25, 28 are attached to the upper frame, and the others are attached to the lower frame.

Next, FIG. 2 shows a supply device for the ink film 22 in the present invention.

In FIG. 2, a brake drum 3 is attached to a film supply roller 23 that supports the rotation of a wound ink film 22.
5, and brake drum 35 and brake pad 36.
9 springs 37.3 tensioned so that they come into contact and generate a frictional force.
8 is installed. Further, a guide groove 40 cut out in the support plate 39 is provided so that the roller 40 that contacts the outer diameter of the ink film 22 is supported by a bearing 41 and can move in the radial direction.
is installed. Further, in order to reduce the number of parts and make the device smaller and cheaper, the support plate 39 is made of a sheet metal structure, and the brake pad 36, the opening, and -240 are supported only by the support plate 39. The support plate 39 is fixed to the lower frame 2. Furthermore, the roller 40 and the brake pad 36 are suspended from each other by tension springs 37, 38. The ink film 22 is attached to the film supply roller 23 with a pin (not shown).
is installed on.

Hereinafter, the operation for pulling out the ink film 22 wound in a spiral shape will be explained with reference to FIG. 2. First, as the ink film 22 is pulled out, the outer diameter of the ink film 22 becomes smaller. In that case, the roller 48 also contacts the ink film 22 and becomes smaller in the radial direction along the guide groove 50.

Consequently, the tension force of the tension springs 37 and 38 that tension the roller 40 and the brake pad 36 becomes smaller, the frictional force between the brake pad 36 and the brake drum 35 becomes smaller, and the tension torque of the ink film 22 becomes smaller. at the same time,
Even if the outer diameter of the ink film 22 becomes smaller and the tensile torque of the ink film 22 becomes smaller, a constant tension can always be supplied to the ink film.

Further, FIG. 3 shows the relationship between the amount of change in the ink film diameter and the tension of the ink film. As shown in the figure, the ink film tension remains constant even if the ink film diameter changes.

As explained above, according to the device of the present invention, there is no need for a device for detecting the amount of change in the radial direction and the tension of the ink film, and the ink film is kept constant even when the ink film changes in the radial direction due to pulling out or winding up the ink film. Since the tension can be supplied, reliability with respect to tension can be improved and the device main body can be downsized. Furthermore, since the number of parts is small, it is inexpensive and easy to manufacture, and the ink film can be easily attached and replaced, so that operability can be improved.

〔Effect of the invention〕

According to the sheet material supply device of the present invention, the following effects can be achieved.

1. Since the ink film can be supplied with a constant tension, it has the effect of improving printing quality and stabilizing the quality. In addition, it is possible to prevent the ink film from wrinkling and jamming.

2. The device can be miniaturized and manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a heat-rolling recording device to which the device of the present invention is applied, Fig. 2 is a side view of a sheet material supply device of the present invention, and Fig. 3 is a diagram showing the amount of change in ink film diameter and the ink film tension. FIG. 3 is a diagram for explaining the relationship of forces. 2... Lower frame, 3... Upper frame, 8... Paper tray, 9.10, 11, 12.13... Roller, 1
7...Platen roller, 20.21...Guide, 2
2... Ink film, 23... Film supply roller, 24... Film take-up roller, 28... Thermal head, 35... Brake drum, 37.38
...Spring.

Claims (1)

[Claims] In a sheet-like material supply device that draws out a sheet-like material spirally wound around a rotating shaft like an ink film with a constant tension, a braking member is provided on a rotor that rotates around the rotating shaft, and the braking member is provided with a braking member. The method is characterized in that an elastic body for pressing the pressing member is provided on the member, and the pressing member is stretched between the roller that contacts the outer diameter of the sheet-like material and moves according to the change in the outer diameter. Sheet material supply device.