JPS61197267A - Thermal transfer paper take-up mechanism - Google Patents

Abstract

PURPOSE:To enable forward rotation and reverse rotation to be repeated without causing a film to sag, by a construction wherein take-up and rewinding spools are connected to driving shafts through sliding clutches, respectively, and the driving shaft on the payout side is fixed. CONSTITUTION:The sliding clutches 8a, 8b provide appropriate sliding frictional forces through disks 10a, 10b and spring mechanisms 9a, 9b. When a rotational torque of not less than a fixed value is applied to the driving shaft on the driving-side 14a (in the case of forward rotation) or 14b (in the case of reverse rotation), the sliding clutch 8a or 8b performs sliding rotation, thereby transmitting a fixed rotational torque to the driving-side spool 2 or 1. On the other hand, the payout-side spool 1 or 2 is fixed by the clutch 8b or 8a, so that the relevant clutch applies a tension to the driving-side through the film 7, and applies a tension as a braking force when stopping the rotation. Accordingly, the response properties of the driving-side spool and the payout-side spool are enhanced, and the film is prevented from sagging.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a thermal transfer paper winding mechanism in a facsimile machine or the like.

In recent years, thermal transfer recording methods have become popular in facsimile machines, printers, etc., but in this method recording materials such as ink coated on thermal transfer paper are thermally transferred onto the recording paper using a heated recording head. be.

Since the above thermal transfer paper can usually be thermally transferred only once,
Film-like thermal transfer paper (hereinafter referred to as film) is rolled onto a spool, and is wound up by a recording platen roller at the same speed as the paper feed speed of the recording paper, so that new film is always continuously supplied to the head. It's controlled like that.

On the other hand, paper sheets such as cut sheets are used as recording paper.
In recent years, there has been a growing demand for the use of continuous paper (roll paper) wound on a spool in facsimile machines and the like.

When using roll paper, it is necessary to cut the paper into a predetermined number of sheets after recording the page, and the paper is fed out extra because it is guided to a cutting means (cutter). Therefore, if the next page is recorded as it is, a blank space will be left at the leading edge of the recording paper.

Since the film is similarly wound together with the recording paper, there are unused portions between the pages.

As a result of the above, it is necessary to rewind the unused portion of the film along with the recording paper, but in the case of film, there is inertia due to the spool, and when rewinding the film after winding, there is a possibility that slack may occur between the spools.

As speed increases, this slack prevents smooth winding and unwinding operations and becomes a cause of failures. Therefore, a simple thermal transfer paper winding system that does not cause slack and can perform responsive one-winding unwinding is developed. is desired.

[Conventional technology]

An example of a side view of a recording mechanism of a facsimile machine using roll paper is shown in FIG.

In the figure, 1 is a film supply spool, 2 is a take-up spool, 3 is a roll paper, 4 is a recording platen roller, 5 is a head, 6 is a cutter, 7 is a film, and 8 is a fed recording paper.

In the above mechanism, during recording, the recording paper 8 and film 7 are fed out by the recording platen roller 4, heated by the head 5, and ink is thermally transferred from the film 7 to the recording paper 8, but the film 7 is wound onto the take-up spool 2. The recording paper 8 is then fed out to the cutter 6.

Even after the recording of the page is completed, the recording paper 8 (and the film 7 at the same time) is fed to the cutter position by the recording platen roller 4 in order to cut it into a predetermined paper length (portion C). Therefore, if the recording of the next page is continued as it is, a margin will be left on the leading edge of the recording paper and the film 7 of that page. Therefore, after cutting is completed, the recording platen roller 4 is rotated in the reverse direction, and the supply spool 1 is driven in the reverse direction to control the rewinding of the recording paper 8 and the film 7.

As described above, since winding and rewinding are performed page by page, the film 7 tends to become slack on both sides of the recording platen roller 4 due to the inertia of the supply spool 1 and take-up spool 2.

[Problem that the invention seeks to solve]

The film 7 is usually very thin, and if appropriate tension is not applied to the film when the recording platen roller 4 performs forward and reverse rotation control, the problem is that normal continuous feeding operation becomes impossible as the speed increases. have.

[Means for solving problems]

The above-mentioned conventional problems are related to the means for connecting the winding and supply spools to the rotary drive shaft through slip clutches, and the fact that the rotary drive shaft is connected to the rotary drive means on the drive side during the winding and rewinding operations. This problem can be solved by the thermal paper winding mechanism of the present invention, which is equipped with a means for fixing the rotary drive shaft.

[Effect]

According to the present invention, the supply 9 winding spools are connected to respective drive shafts via slip clutches having an appropriate frictional force, and the drive side is driven with a constant rotational torque during winding 1 rewinding. At the same time, in order to fix the drive shaft on the feed side, a slip clutch on the feed side applies tension to the drive side, and also acts as a braking force during a stopping operation to absorb inertia.

Since the above operations are alternately switched during the winding and second rewinding operations, the tension is always the same during the first rewinding and winding by the recording platen roller, and there is an effect that slack due to inertia does not occur.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Figure 1 (al is a top view of the film winding mechanism, Figure 1 ('
b) is a side view, and FIG. 1(C) is a top view of the winding mechanism for explaining the present invention in detail.

In FIG. 1 (al), 8a and 8b are slip clutches, and the drive shafts 14a and 14b and the spool 1,
2 are joined via disks 10a and 10b having sliding friction, 14a is a rotational drive shaft that rotates the take-up spool 2 in the normal rotation direction (input direction) during the winding operation (normal rotation), and 14b A rotary drive shaft 1 rotates the supply spool 1 in the reverse direction (direction B) during rewinding operation (reverse rotation).
2a.

Reference numerals 12b denote one-way clutches 15a and 15 that allow the rotational drive shafts 14a and 14b to rotate only in the drive rotation direction;
b is a one-way clutch that connects the rotary drive shafts 14a and 14b to the pulley 13 during forward and reverse rotation, and 16 is a motor capable of forward and reverse rotation.

Other symbols that are the same as those in FIG. 2 represent the same objects.

The slip clutches 3a and 3b are connected to a disc 10 as shown in the figure.
a, 10b and spring mechanisms 9a, 9b provide an appropriate sliding friction force, and the driving side drive shaft (14a in forward rotation, 14b in reverse rotation) is applied.

(The same applies hereafter)) When a rotational torque of a certain level or more is applied to the slip clutch (8a, 8b), the slip clutch (8a, 8b) performs a slip rotation and transmits a certain rotational torque to the driving side spool (2, 1).

On the other hand, since the spools (1, 2) on the feeding side are fixed via slip clutches (8b, 8a), the corresponding slip clutches apply tension to the drive side via the film 7, and also apply a brake when stopping. Acts as a force. Therefore, the responsiveness of the drive side and feed side spools is improved, and no slack occurs.

The operation of the above film winding mechanism is shown in Figure 1 (C).
This will be explained with reference to.

FIG. 1 (TC) is a functional equivalent diagram for explaining the forward rotation operation of the take-up spool 2 for winding.

The recording paper 8 and the film 7 are wound up and rewound by the recording platen roller 4 and the presser roller 18 (see FIG. 2). Perform rewind.

That is, as shown in FIG. 1(C), in normal rotation operation, the one-way clutch 15a connects the drive shaft 14a and the pulley 13,
On the feed side, the drive shaft 14b and the pulley 13 are in a free state.

Through the clutch control described above, the rotational torque of the motor 16 is transmitted to the spool 2 through the drive shaft 14a, and the film 7 is wound up.
is fixed because it rotates in the opposite direction to the driving direction, and the slip clutch 8
The frictional force b acts on the film 7 as tension.

The same applies to the case of reverse rotation; when the motor 16 rotates in the opposite direction, the rotary drive shaft 14b reversely drives the spool 1 in the rewinding direction via the slip clutch 8b, and the rotary drive shaft 14a is fixed. A slip clutch 8a applies tension to the film 7.

As a result of the above, it is possible to wind and unwind the film 7 without causing any slack, and the responsiveness of the operation can be improved.

〔Effect of the invention〕

As explained above, according to the present invention, the take-up and unwind spools are connected to the drive shaft via the slip clutch, and the drive shaft on the feed side is fixed, so the slip clutch on the feed side is connected to the drive shaft. Since tension is applied to the film, it is possible to repeat forward and reverse rotations without causing any slack in the film.

[Brief explanation of drawings]

Figure 1(a) is a top view of the film winding mechanism, Figure 1<'
b) is a side view, FIG. 1(C) is a top view of a winding mechanism for explaining the present invention in detail, and FIG. 2 is a side view of a recording mechanism of a facsimile apparatus using roll paper. In the figure, 1 is a supply spool, 2 is a take-up spool, 3 is a roll paper, 4 is a recording platen roller, 5 is a head, 6 is a cutter, 7 is a film,
8 is a fed-out recording paper, 8a and 8b are slip clutches, 9a and 9b are spring mechanisms, 10a and 10b are disks, 12a and 12b are one-way clutches, 13 is a pulley, 14a and 14b are drive shafts, 15a and 15b is a one-way clutch, 16 is a motor, and 18 is a holding roller. B-ichigado leather l shi■ (go2.nj#/ figure (mu)

Claims (1)

[Claims] A recording device that is equipped with a supply spool that supplies thermal transfer paper and a take-up spool that takes up the paper, and that continuously performs thermal transfer recording while controlling the winding and rewinding by driving each spool in the forward and reverse directions. The thermal transfer paper winding mechanism includes means for connecting the winding and supply spools to a rotary drive shaft via slip clutches, and a means for connecting the rotary drive shaft to a rotary drive means on the drive side during winding and rewinding operations, respectively. A thermal transfer paper winding mechanism characterized by comprising means for fixing a rotational drive shaft on the joining and feeding side.