JPS6316536Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording paper winding device for a small printer, and particularly to a power transmission method for the winding device.

In the conventional winding device that uses a winding drive cam without teeth, power is transmitted by friction between the winding drive cam and the transmission belt, and between the transmission belt and the winding driven pulley. If the take-up drive cam and the transmission belt, or the transmission belt and the take-up driven pulley slip, it will not only be impossible to achieve the sudden increase in the transmission torque required when winding the recording paper, but also cause the recording paper to slip. In some cases, even the tension required for winding could not be generated.

This invention improves the drawbacks of the conventional recording paper winding device that uses a winding drive cam without a tooth profile. The purpose of this method is to prevent the recording paper from loosening by winding the recording paper in a tight state by winding it up, and by maintaining the wound state when the recording paper is not wound up.

An embodiment of the recording paper winding device of the present invention will be described in detail below with reference to FIGS. 1, 2, and 3.

1 is a printer, and 2 is a drive shaft of the printer body. Reference numeral 3 denotes a winding drive cam that is supported by the drive shaft 2, and a part of the winding drive cam includes a tooth pattern 3-1 and a friction transmission part 3-.
It has 2. A transmission belt 4 transmits power from the winding drive cam 3 to the winding driven pulley 5, and has teeth 4-1 on its inner periphery. 5-1 is a tooth pattern provided on the outer periphery of the winding driven pulley. Reference numeral 6 denotes a take-up driven gear that is integrated with or engaged with the take-up driven pulley 5. 8 is a winding frame, 9 is a supplied recording paper, 10 is a recording paper printed by the printer 1, and 11 is a winding unit integrated with the winding shaft gear 7.

After the recording paper 10 printed by the printer 1 is fed, the power of the drive shaft 2, which rotates once per printing cycle of the printer 1, is transferred from the winding drive cam 3 to the transmission belt 4, the winding driven pulley 5, and the winding By being transmitted to the driven gear 6 and the winding shaft gear 7, the winding is wound into the winding unit 11.

A method for transmitting power from the take-up drive cam 3 to the transmission belt 4, and further from the transmission belt 4 to the take-up driven pulley 5, the take-up driven gear 6, and the take-up shaft gear 7 will be described in detail.

Normally, the winding drive cam 3 contacts the teeth 4-1 of the transmission belt 4 at the friction transmission section 3-2, and applies enough power to the recording paper 10 wound around the winding unit to prevent it from loosening. This is caused by.

At the time of winding, the tooth pattern 3-1 of the winding drive cam 3 and the tooth pattern 4-1 of the transmission belt 4 mesh to rapidly generate power, so that the recording paper 10 is similarly rapidly wound and may become bulged. It is wound up in a state in which it is tightened to the winding unit 11 without any problems. At this time, the winding drive cam 3 and the transmission belt 4 are
Furthermore, since the transmission belt 4 and the winding driven pulley 5 are always mechanically engaged by the teeth 4-1 and 5-1, power is reliably transmitted even if there is a disturbance such as oil. can do.

The tooth profile 3-1 of the winding drive cam 3 is a friction transmitting portion 3-
Although the distance from the center of rotation of the drive shaft 2 is longer than that of the drive shaft 2, as shown in FIG. Similar effects can be obtained by providing the friction transmission section 3-2.

The take-up drive cam 3 rotates once per printing cycle, and after the printer 1 prints on the recording paper 9 and feeds the paper, the timing is adjusted so that the tooth pattern 3-1 and the tooth pattern 4-1 engage with each other. good.

The power transmitted by the teeth 3-1 of the take-up drive cam 3 is larger than the maximum rotational load of the take-up unit 11, and prevents the paper feed mechanism of the printer 1 from slipping, that is, prevents paper feed pitch defects. Set within the limit that will not occur.

As described above, according to the present invention, when the toothed part provided on the winding drive member meshes with the toothed belt, the recording paper is suddenly wound up, and the friction transmission part provided on the winding drive member Since the recording paper is configured to maintain its wound state when sliding on the belt, the recording paper can be wound up firmly and tightly against the winding member without being bulged. It can be wound up, and there is no reduction in winding efficiency due to slack in the recording paper. Furthermore, since the wound recording paper does not bulge or sag, it is possible to obtain the effect that the recording paper that has been wound up does not slip or fall off from the winding member.

[Brief explanation of drawings]

FIG. 1 is a side view showing a recording paper winding device of the present invention. 1: Printer, 2: Drive shaft, 3: Winding drive cam, 4: Transmission belt, 5: Winding driven pulley, 6:
Winding driven gear, 7: Winding shaft gear, 8: Winding frame, 9: Supply recording paper, 10: Printed recording paper,
11: Winding unit, 3-1: Winding drive cam tooth profile, 3-2: Winding drive cam friction transmission section, 4-1:
Tooth profile on the inside of the transmission belt, 5-1: Tooth profile of the winding driven pulley. FIG. 2 is a partially assembled view showing a transmission means of a winding device for winding recording paper according to the present invention. FIG. 3 shows another embodiment of the drive cam.

Claims (1)

[Scope of Claim for Utility Model Registration] A portion of the outer periphery of a recording paper winding device in which recording paper printed by a printing means is sent out by a paper feed roller and the recording paper is wound up by a winding device. a winding drive member having a toothed portion provided with teeth and a friction transmission portion not provided with teeth, the driving force of the winding driving member being suddenly transmitted when meshing with the toothed portion of the winding driving member; a toothed belt that meshes with the teeth of the toothed belt and receives the driving force of the winding driving member; a winding driven member that meshes with the winding driven member and receives the driving force of the winding driving member; When the toothed part meshes with the toothed belt, the recording paper is rapidly wound up, and when the friction transmission part of the winding drive member slides on the toothed belt, the recording paper is wound up. A recording paper winding device comprising: a winding member to which the driving force of the winding drive member is transmitted so as to maintain the state of the recording paper winding device.