JPH029978Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a recording paper winding device, and particularly to a winding power transmission method.

The biggest drawback of the winding transmission method in conventional recording paper winding devices is constant torque winding. In other words, considering the original way of winding recording paper,
Constant tension winding is considered ideal. In constant torque winding, when the winding spool diameter is small, that is, at the beginning of winding, a very large tension is applied to the recording paper, causing the problem that the recording paper is pulled out more than the paper feed amount and then wound. Another problem is that the recording paper is wound too tightly around the take-up spool shaft, making it difficult to remove the recording paper that has wound up from the spool shaft when winding is complete. The only way to avoid such problems is to reduce the winding drive torque as much as possible. However, reducing the winding drive torque not only causes problems such as winding not being possible or winding loosening when the winding spool diameter becomes large, that is, at the end of winding, but also Under these circumstances, winding becomes almost impossible, and the durability is unreliable.

Also, a drawback of the winding transmission method in the conventional winding device is the slip clutch mechanism. During winding, the rotation angle of the take-up spool shaft changes as the take-up spool diameter changes. That is, when the take-up spool diameter is small, the rotation angle is large, and as the spool diameter becomes larger, the rotation angle becomes smaller. For this reason, a friction slip latch made of a compression spring member or the like is often used on the winding transmission path in the winding device. However, this friction slip latch not only has problems such as the sliding torque changing significantly due to external factors, such as changes in the environment or the presence or absence of oil, but also due to internal factors, such as the finish condition of the sliding surface or the compression spring force. The sliding torque changes significantly depending on finishing accuracy, etc., and it must be said that it is extremely unstable from a durability standpoint and has extremely poor reliability.

The present invention improves the drawbacks of the conventional recording paper winding device as described above. That is, 1
A torsion coil spring member is interposed on a winding transmission path between a winding drive mechanism and a winding spool that are driven to be engaged at a certain angle during a printing cycle (one paper feed cycle) and then released from the engaged state, The purpose is to keep the tension of the recording paper generated during winding as constant as possible regardless of the winding diameter.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the recording paper winding device of the present invention will be described in detail below with reference to FIGS. 1 to 4. 1 is a printer, 2 is a drive shaft, 3 is an intermittent drive gear, 4 is an intermittent driven gear, and an intermittent driven pulley 5 is integrally provided. 6 is an intermittent driven shaft that pivotally supports the intermittent driven gear 4. 7 is a transmission belt, and 8 is a winding pulley. 9 is a take-up transmission gear engaged with the take-up transmission pulley 8 and the torsion coil spring 10; 11 is the take-up transmission pulley 8, the take-up transmission gear 9, and the torsion coil spring 1;
This is the winding transmission shaft that supports the 0. A take-up pulley 12 is gear-engaged with the take-up transmission gear 9 and is rotatably held by the take-up frame 15. Reference numeral 13 is a recording paper with printed information. Drive shaft 2 rotates once in one print cycle (one paper feed recycle)
When the intermittent drive gear 3 fixedly attached rotates in the direction of the arrow and engages with the gear of the intermittent driven gear 4, the intermittent driven gear 4, that is, the intermittent driven pulley 5 is rotated by a constant angle. At this time, driving force is applied to the take-up pulley 8 by the transmission belt 7. Makitoriden Epuri 8
When rotates in the direction of the solid line arrow, the torsion coil spring 10 is deflected, and driving force is applied to the take-up pulley 12 via the take-up transmission gear 9 to perform winding. At this time, the deflection twist angle α of the torsion coil spring 10 changes depending on the winding diameter r of the recording paper 13 wound around the winding pulley 12. That is, when the intermittent drive gear 3 further rotates, the torsion coil spring 10
The deflection torsion angle α increases, but when the intermittent drive gear 3 is disengaged from the intermittent driven gear 4,
The winding force stored in the torsion coil spring 10 is transferred to the winding transmission pulley 8, the transmission belt 7, and the drive transmission gear 4.
is released by rotating in the direction opposite to the winding direction (in the direction of the dashed arrow in the figure) and returns to the standby state.
In this way, 1 print cycle (1 paper feed cycle)
By always returning the torsion coil spring 10 to the standby state, that is, the deflection twist angle α=0 of the torsion coil spring 10 in each case, the winding force generated on the winding pulley 12 changes depending on the winding diameter r of the recording paper 13. Become. That is, if the diameter of the winding shaft of the take-up pulley 12 is r ₀ and the deflection twist angle of the torsion coil spring 10 at this time is α ₀ , then when the recording paper diameter is r _o , the deflection twist angle α _o is expressed by the following equation. It can be done.

α _o = α ₀ + K (Q ₀ − Q _o ) Here, Q ₀ is the recording paper feed amount l when the take-up shaft diameter is r ₀ , that is, the rotation of the take-up pulley 12 to wind the take-up amount l. Q _o is the rotation angle at which the take-up pulley 12 rotates to wind the take-up amount l when the diameter of the recording paper wound on the take-up pulley 12 is r _o , and K
is the gear ratio between the take-up transmission gear 9 and the take-up pulley 12 gear.

In the above relationship, r _o /r ₀ =Q ₀ /Q _o α _o /α ₀
That is, by setting K and α ₀ so that Q ₀ /Q _o 1+K/α ₀ (Q ₀ −Q _o ), the winding torque given to the winding pulley 12, that is, the deflection torsion angle α of the torsion coil spring 10 can be made proportional to the winding diameter r of the recording paper 13 wound around the winding pulley 12. That is, it becomes possible to bring the tension applied to the recording paper 13 close to a constant value.

FIG. 4 shows another embodiment, in which a transmission belt 24 is moved by an eccentric cam 23 fixed to a drive shaft 22.
The winding transmission pulley 25 is driven with high torque during a certain angle and with low torque during the remaining angles. That is, when the tooth portion 23-1 of the eccentric cam 23 and the tooth portion 24-1 of the transmission belt 24 are engaged, a high torque is generated due to mechanical coupling, and the arc portion 23-2 of the eccentric cam 23 is engaged with the tooth portion 24-1 of the transmission belt 24.
When engaged with the transmission belt 24, a low torque is generated by friction drive, and this is transmitted to the take-up transmission pulley 25. For this reason, the standby state of the torsion coil spring 10 engaged with the take-up transmission pulley 25 and the take-up transmission gear 9 is maintained in a state where the deflection torsion angle α・>0, that is, the standby state is maintained with respect to the take-up spool 12 at all times. By generating torque in the winding direction, defects such as unwinding can be easily improved.

As described above, according to the present invention, after the recording paper is wound onto the take-up spool, the coil spring member is once returned to its original deflection torsion angle, so that the recording paper wound onto the take-up spool is Even if the winding diameter changes, the deflection/twist angle of the coil spring member can be made proportional to the winding diameter of the recording paper wound on the take-up spool, making it possible to always wind the recording paper with a constant tension. Become. Therefore, the recording paper is wound up in an orderly manner with the same tightening force from the beginning to the end of the winding process, there is little curling, and there is no possibility that the recording paper will be rolled up in a jagged manner. Furthermore, after winding up the recording paper, the coil spring member returns to its original deflection and twist angle, so compared to a winding device that constantly applies deflection force to the spring member, the drive source requires much higher power. The recording paper can be wound stably even when the winding diameter of the recording paper changes with a low-power driving source.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the recording paper winding device of the present invention, FIG. 2 is a front view showing the winding section, and FIG. 3 is an exploded view of the torsion clutch section.
FIG. 4 shows another embodiment of the recording paper winding device of the present invention. 3... Intermittent drive gear, 4... Intermittent driven gear, 7
...Transmission belt, 8...Makitoriden Epuli, 9...
Winding transmission gear, 10... Torsional coil spring, 12
...Take-up pulley, 23... Take-up eccentric cam, 24
...Transmission belt, 25...Makitoriden Epuri.

Claims (1)

[Scope of Claim for Utility Model Registration] In a recording paper winding device that intermittently winds printed recording paper onto a winding spool by the power of an intermittent drive means that rotates intermittently, the rotational force of the intermittent drive means is intermittently a winding transmission pulley that is transmitted to the winding transmission pulley; a winding transmission gear that is coaxially supported on the winding transmission pulley; and a winding transmission gear that is stretched between the intermittent drive means and the winding transmission pulley and rotates the intermittent drive means. a transmission means for transmitting force to the winding transmission gear via the winding transmission pulley; a winding gear meshing with the winding transmission gear to rotate the winding spool by a certain amount; and the winding transmission The intermittent driving means includes a coil spring member interposed between the pulley and the winding transmission gear, and the intermittent driving means is capable of causing the transmission means to reverse rotation due to the restoring force of the coil spring member when the driving force is not transmitted. When the deflection twist angle of the coil spring member is α ₀ , the gear ratio of the winding transmission gear and the winding transmission pulley is K, and the winding shaft diameter of the winding transmission pulley is r ₀ The rotation angle at which the take-up transmission pulley rotates is Q ₀ , and when the winding diameter of the recording paper wound on the take-up shaft is r _o , the rotation angle at which the take-up transmission pulley rotates is Q _o . , Q ₀ /Q _o 1+K/α ₀ (Q ₀ −Q _o ), and the gear ratio K of the winding transmission gear and the winding transmission pulley and the deflection torsion angle α ₀ of the coil spring member are set. Features a recording paper winding device.