JPS61120781A - Ink sheet take-up mechanism - Google Patents

Abstract

PURPOSE:To form a slippage mechanism and a relief mechanism integrally by transmitting a driving force to a take-up roll through a frictional force. CONSTITUTION:Both ends of a feed roller 17 are axially supported by a bracket 15, and a feed gear 18 is mounted on one end of said axis through a one-way clutch which allows the feed roller 17 to rotate freely when an ink sheet 8 is fed in an arrow direction (a), thus transmitting the driving force of a motor to the feed roller 17 through an idle gear 19 and the feed gear 18. In addition, the bracket 15 is set in such a way that it rotates freely centering about the shaft 16. As a result, the feed roller 17 can contact and separate from a take-up roll 12, and the feed roller 17 is pressed against the take-up roll 12 by pulling one end of the bracket 15 using a spring 20. In turn, the driving force of the feed roller 17 is transmitted to the take-up roll 12 through a frictional force.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an ink sheet winding mechanism of a thermal transfer recording device used in facsimiles, printers, and the like.

<Prior Art> Conventionally, this type of thermal transfer recording apparatus consists of a recording material conveyance system and an ink sheet conveyance system, as shown in FIG. After exiting the material roll 2, the material is conveyed through a guide roller 3, a recording section consisting of a thermal recording head 4 and a platen roller 5 that are pressed together, and then sent out to a cutter 7 via a separating member 6.

Further, after the ink sheet 8 of the ink sheet conveyance system leaves the supply roll 9, it is subjected to a bank tensile run by the pinch roller 10, and is conveyed in close contact with the recording material 1 by passing between the platen roller 5 and the thermal recording head 4. The recording material 1 is further separated from the recording material 1 by a separating member 6, a front tension is applied by a pinch roller 11, and the recording material is wound onto a winding roll 12. Here, the take-up roll 12 is driven by meshing an idle gear 14 with a gear 13 attached to the take-up roll 12, as shown in FIG.
This is done by transmitting the driving force of

<Problems to be Solved by the Invention> However, in the above configuration, since the driving force for winding the ink sheet 8 is applied directly to the winding roll 12 via the gears 13 and 14, recording does not proceed. Take-up roll 1
In order to prevent the winding speed of the ink sheet 8 from becoming inconsistent as the outer diameter of the recording material 1 changes, it is necessary to separately provide a slip mechanism to absorb the speed change. When the ink sheet conveyance system is separated from the recording material conveyance system for loading, etc., the gear 13 and the idle gear 14 are separated, but when they are brought into mesh again, if the meshing state is uncertain, the idle gear 14 can escape. It is necessary to provide an escape mechanism.

Therefore, in the above-mentioned apparatus, a slip mechanism and an escape mechanism must be provided in the ink sheet winding mechanism, which complicates the overall structure of the apparatus and increases the cost.

The present invention has been developed to solve the above-mentioned conventional problems, and its purpose is to provide an ink sheet winding mechanism that integrates the slip mechanism and escape mechanism.

Means for solving the above problems> One means according to the present invention for solving the above problems is as follows.
To explain with reference to the figure, reference numeral 15 denotes a box-shaped bracket attached via a shaft 16 to the vicinity of the take-up roll 12 of the ink sheet 8 in the thermal transfer recording device. Both ends of the feed roller 17 are supported by a shaft, and one end of the shaft is connected to a one-way clutch (not shown) that allows the feed roller 17 to rotate freely when the ink sheet 8 is conveyed in the direction of arrow a in the figure. A feed gear 18 is attached to the shaft 1, and an idle gear 19 that meshes with the gear 18 is attached to the shaft 1.
6, and is configured such that the driving force of a motor (not shown) is transmitted to the feed roller 17 via the idle gear 19 and the feed gear 1B.

Further, the bracket 15 is rotatably attached around a shaft 16, so that the feed roller 17 can come into contact with and separate from the take-up roll 12, and by pulling one end of the core bracket 15 with a spring 20, the feed roller 17 can be moved toward and away from the take-up roll 12. The roller 17 is in pressure contact with the take-up roll 12, and the driving force of the feed roller 17 is transmitted to the take-up roll 12 through frictional force. Here, the tensile force of spring 20 is! ! The strength of the take-up roll 12 is such that it can wind up the ink sheet 8, and if a greater load is applied, the feed roller 17 will slip at the contact area with the take-up roll 12. There is.

Further, a bracket stopper (not shown) is provided at a predetermined position to prevent the bracket 15 from rotating too much in the direction indicated by the arrow in the figure due to the tension of the spring 20 when the take-up roll 12 is removed from the apparatus.

<Operation> Next, the operation of the ink sheet winding mechanism configured as described above will be explained.

When recording, as shown in FIG. 1, the feed roller 17 to which the driving force of the motor is transmitted is pressed against the take-up roll 12 to start thermal transfer recording, and the recording material l and the ink sheet 8 are conveyed by the platen roller 5. , the ink sheet 8 is wound onto a take-up roll 12. At this time, if the winding speed of the ink sheet 8 by the feed roller 17 is set to be faster than the conveying speed by the platen roller 5, the faster speed is absorbed by the slip of the feed roller 17. Therefore, the ink sheet winding speed of the take-up roll 12 always matches the conveying speed of the platen roller 5 regardless of changes in the roll diameter, and the ink sheet 8 is in a state where the tension run is applied due to the feed roller 17 slipping. It is something that is wound up.

The take-up roll 12 is also used when attaching and detaching the ink sheet conveying system from the recording material conveying system to replace the ink sheet, etc.
Since the feed roller 17 and the feed roller 17 are connected in a press-contact state, they can be easily and reliably brought into contact with each other and separated from each other.

<Example> Next, an example in which the feed roller 17 is driven by the driving force to the platen roller 5 will be described.

As shown in FIG. 2, an idle pulley 21 is attached to the idle gear 19 connected to the feed roller 17, and a platen pulley 22 is attached to the platen roller 5, and both pulleys 21 and 22 are connected by a belt 23 to drive the platen roller 5. Idle gear where the power remains the same 19. It is transmitted from the feed gear 18 to the feed roller 17. Therefore, in this case, there is no need to separately install a drive source such as a motor for driving the foot roller.

In the above configuration, if the connection between the platen pulley 22 and the idle pulley 21 is one-to-one, by making the diameter of the feed roller 17 slightly larger than the diameter of the platen roller 5, it is possible to It is something that can be hung with Tenshiran.

<Effects of the Invention> As described above, the present invention has a structure in which the feed roller is brought into pressure contact with the take-up roll and the frictional force is used to transmit the driving force to the take-up roll. The joint slips, and as a result, the winding speed can be kept constant at all times, and the ink sheet transport system and ink sheet winding drive system can be reliably and easily connected to and separated from each other. This eliminates the need to provide separate escape mechanisms for each system.
be.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of an ink sheet conveying system according to the present invention, and FIGS. 3 and 4 are explanatory diagrams of a conventional thermal transfer recording apparatus and its ink sheet transport system. 1 is a recording material, 2 is a recording material roll, 3 is a guide roller, 4
5 is a thermal recording head, 5 is a platen roller, 6 is a separation member,
7 is a counter, 18 is an ink sheet, 9 is a supply roll, 1
0.11 is a pinch roller, 12 is a take-up roll, 14
．． 19 is an idle gear, 15 is a bracket, 16 is a shaft, 17 is a feed roller, 18 is a feed gear, 2
0 is a spring, 21 is an idle pulley, 22 is a platen pulley, and 23 is a belt.

Claims (1)

[Claims] An ink sheet winding mechanism for winding an ink sheet onto a winding roll in a thermal transfer recording apparatus, the ink sheet winding mechanism transmitting driving force to the winding roll via frictional force.