JPS6038278B2 - paper feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding mechanism for a small printer that feeds paper intermittently.

An object of the present invention is to enable special paper feeding (rapid paper feeding) in contrast to normal paper feeding by changing the rotation ratio between the driven wheel and the prime mover.

Another object of the present invention is to reduce driving noise by meshing gears between the driven wheel and the prime mover. Still other objects of the present invention are that the precision of parts can be easily achieved, the structure is simple and easy to assemble, the size and power can be easily reduced, and the cost can be reduced. Various methods have been considered for intermittent paper feeding in conventional 4-inch printers, including a plunger method, a cam and IJing method, and a clutch method. )
In this case, the method using a plunger has a simple structure, but the plunger has to be operated several times to rapidly feed the paper, making the plunger large, expensive, and requiring a large amount of current. In addition, methods using clutches or cam rings have a complicated structure, the drive noise is relatively large, and the operation has to be performed several times for the amount of rapid paper feed.Furthermore, the operation control circuit is complicated and is proportional to the number of operations. This inevitably increases the operating time, which is not desirable in terms of commercial value. The present invention eliminates or improves these drawbacks, and uses sliding means to
By sliding the driven wheel (driven wheel) back and forth in the thrust direction to change the rotation ratio between the driven wheel and the driving wheel that transmit rotation to the paper feed roller, paper can be easily fed faster than normal paper feeding. This is what I did.

An overview diagram of one embodiment of the present invention is shown in FIG. 1, and operation diagrams are shown in FIGS. 2, 3, 4, and 5 below.

In FIG. 1, a transmission driving gear 2 is attached to a transmission driving shaft 1, and the transmission driving shaft 1 is connected to a motor and rotates in the direction of an arrow 101.

The driving shaft 3 includes a driving gear portion 5 that meshes with the transmission driving gear 2, a normal paper feed tooth portion 6 provided on a part of the circumference, and a paper fast feed tooth portion 7 provided on a portion of the circumference. A driving gear 4 having an arcuate cam portion 8 provided on the other part of the same circumference where the normal paper feed tooth portion 6 and the paper fast feed tooth portion 7 are provided is pivoted so as to be slidable in the thrust direction, and is pivoted in the direction of arrow 102. further rotates to the driving shaft 3.
Due to the energy stored in the sliding spring 10 supported by the table feed spring support pin 9 fixed to electromagnet 1 when the paper is fast forwarded.
The sliding lever 11 is attracted by the arrow 9 in the direction of the arrow 106.
is supported by The driven shaft 12 has a paper feed tooth groove portion 14 that meshes with the normal paper feed tooth portion 6 during normal paper feeding and meshes with the normal paper feed tooth portion 7 during fast paper feed, and a circular arc groove portion 14 that meshes with the normal paper feed tooth portion 7 during normal paper feeding and when the paper feed is finished and when paper feeding is stopped. A driven tooth portion 13 in which locking tooth portions 15 that lightly touch the cam portion 8 and act as a lock are arranged alternately on the circumference.
is adhered to the driven shaft 12, and a paper feed roller 16 is attached to the driven shaft 12. The paper feed roller 16 receives pressure from a paper press roller 17 and transports the printing paper 18 in the direction of arrow 104 by frictional force with the paper press roller 7. Next, the operation from the direction of arrow A in FIG. 1 will be described with reference to FIGS. 2 and 3.

FIG. 2 is an operational diagram when paper feeding is stopped.

Normally, the paper feed tooth section 6 and the paper feed tooth section 7 are connected to the paper feed tooth groove section 14.
After meshing with the circular cam part 8 and finishing the paper feeding, the coin retainer tooth part 15 is in light contact with the circular cam part 8. It is locked. By locking the driven gear 13, the rotation of the paper feed roller 16 is completely stopped. Therefore, printing paper 1
8 guarantees reliable transportation without pitch irregularities. FIG. 3 is a diagram of the operation during normal paper feeding. In FIG. Only the feed dog portion 6 is in a position where it can mesh with the paper feed tooth groove portion 14. Therefore, in the driven gear 13, the normal paper feed tooth portion 6 rotating in the direction of arrow 102 meshes with the paper feed tooth groove portion 14, and starts rotating in the direction of arrow 103. When it rotates further, the locking tooth part 15 is locked by the arcuate cam part 8, and the rotation stops. Therefore, the printing paper 18 is normally transported by the distance of the paper feed dog portion 6 and then stopped. Next, FIG. 4 is an overview diagram of the operation when the paper is rapidly fed in FIG. Suction in 106 directions,
The driving gear 4 is slid in the thrust direction 107, and the normal paper feed tooth portion 6 and further the paper fast feed tooth portion 7 are connected to the paper feed tooth groove portion 14.
It will be in a position where it can mesh with the

FIG. 5 is an operation diagram from the direction of arrow B in FIG.
Similarly to the explanation in FIG. 2, the driven gear 13 normally starts to rotate in the direction of arrow 103 when the paper feed tooth portion 6 meshes with the paper feed tooth groove portion 14, and when it rotates further, the locking tooth portion is moved by the circular arc cam portion 8. 15 is locked, the paper fast-feed tooth section 7 starts to engage with the next paper-feed tooth groove section 14, and then the arrow 103
It rotates in the direction of the coin, and then the coin is attached.

That is, by meshing the paper fast-feeding tooth portion 7 and the paper-feeding tooth groove portion 14, the driven gear 13 is moved by an amount corresponding to the paper fast-feeding tooth portion 7.
The rotation ratio between the drive gear 4 and the drive gear 4 changes, and the printing paper 18 is rapidly fed. Further, the driving gear 4 is in the thrust direction 1
When sliding to 07, the locking teeth 16 lightly contact the arcuate cam part 8 and slide while being locked, so the paper feed roller 16 remains stopped and reliable paper feeding without pitch unevenness is guaranteed. . Next, when the voltage applied to the electromagnet 19 is cut off, the sliding lever 11 and the driving gear 4 slide back to their original positions due to the action car 05 of the sliding spring 10 in the thrust direction, and the sliding lever 11 and the driving gear 4 slide back to their original positions. On the other hand, the paper fast feed tooth section 7 does not engage, and only the normal paper advance tooth section 6 returns to the position where it can engage.

As described above, according to the present invention, during normal paper feeding, the paper is fed by the normal paper feeding tooth section 6, and during fast feeding of paper, the driving force is moved by the sliding lever 11 attracted in the direction of the arrow 106 by the electromagnet 19. sliding the gear 4 in the thrust direction 107;
By meshing the paper fast-feeding tooth portion 7 with the paper-feeding tooth groove portion 14 and changing the rotation ratio between the driven gear 13 and the driving gear 4, normal paper feeding and rapid paper feeding can be easily made possible.

Furthermore, driven gear 13 and driving gear 4 can be meshed with each other to reduce drive noise, and furthermore, the structure can be simplified, so parts accuracy can be easily achieved, the number of parts is small, and assembly is easy. Easy to downsize and reduce power,
The cost can be further reduced, and the effect is great. In the present invention, the normal paper feed tooth portion 6 provided on the drive gear 4 has one tooth, and the paper fast feed tooth portion has two teeth.
Although the steel stopper teeth 15 are provided on each of the trailing gears 13, the number of teeth, the shape of the teeth, and the shape of the cam are not restricted.

In addition, although the return means and the Numazu spring 10 are used, the method, form, etc. thereof are not restricted. Furthermore, although the sliding lever 11 and the electromagnet 19 are used as the sliding means, the means for sliding the driving gear 4 in the thrust direction is not limited to the method or form thereof. Furthermore, the driving gear 4 is slid back and forth in the thrust direction, and the driven gear 13
Although we decided to change the rotation ratio with respect to the drive gear 4, the same effect can be achieved by moving the driven gear 13 back and forth in the thrust direction to change the rotation ratio with the drive gear 4, and this is not a hindrance. Next, FIG. 6 shows an overview of another embodiment of the present invention, FIGS. 7 and 8 show operation diagrams from the direction of arrow C in FIG. 6, and operations during fast forwarding of paper in FIG. FIG. 9 shows an overview diagram, and FIG. 10 shows an operational diagram from the direction of arrow D in FIG. 9.

In FIG. 6, the transmission driving shaft 21 has a transmission driving gear 22.
is glued, and the transmission driving shaft 21 connects to the motor as shown by arrow 2.
It is rotating in the 01 direction.

The driving shaft 23 includes a driving gear part 25 that meshes with the transmission driving tooth shield 22, a cylindrical cam part 26 having tooth groove parts 39 and 40 on a part of the circumference, and a cylindrical cam part 26 having tooth groove parts 39 and 40 on a part of the circumference corresponding to the tooth groove part 39. The driving gear 24, which has a normal paper feed tooth portion 27 provided on a part of the paper feed tooth portion 27 and a paper fast feed tooth portion 28 provided on a portion of the circumference corresponding to the tooth groove portion 4, can be driven in the thrust direction. Arrived at Fuji, arrow 202
The driving gear 24 receives an acting force 205 in the thrust direction due to the stored energy of the sliding spring 3 supported by a fast-forwarding spring support pin 29 fixed to the driving shaft 23, and the driving shaft 23 It is pivoted so as to be slidable in the thrust direction, and is supported on a surface of a port lever 31 which is attracted in the direction of arrow 106 by an electromagnet 39 when the paper is rapidly fed. The driven shaft 32 has a normal paper feeding tooth portion 2 during normal paper feeding.
A paper feed tooth portion 34 meshes with the normal paper feed tooth portion 27 and the paper fast feed tooth portion 28 during fast feed of paper, and meshes with the tooth groove 39 during normal paper feed and engages with the tooth groove 39 during fast feed of paper. A driven gear that meshes with the tooth groove 40 and is arranged alternately on the circumference with a paper feed auxiliary tooth part 35 provided so as to lightly touch the outer circumference of the cylindrical cam part 26 after paper feeding is completed and when paper feeding is stopped. 3
3 is attached bare, and a paper pressing roller 37 is attached to the subordinate shaft 32.
A paper feed roller 36 is replaced, which transports the printing paper 38 in the direction of arrow 204 by the frictional force with the paper presser roller 37 under pressure. Figure 7 is a diagram of the operation after paper feeding is completed and when paper feeding is stopped, Figure 8 is a diagram of the operation during normal paper feeding, and Figure 10 is a diagram of the operation when paper is rapidly fed. For fast forwarding of paper, a sliding spring 30 and a sliding lever 31 are used.
, the driving gear 24 is slid back and forth in the thrust direction by the electromagnet 39, and the rotation ratio between the driving gear 24 and the driven gear 33 is changed. This is similar to Figures 2, 3, 4, and 5, and although the tooth shape, cam shape, etc. are different, the operation, effect, and operation are the same. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general view of an embodiment of the present invention, in which 3 is a driving shaft, 4 is a driving gear, 6 is a normal paper feeding tooth section, 7 is a paper table feeding tooth section, and 8 is an arcuate cam. 10 is a sliding spring, 11 is a sliding lever, 12
is a driven shaft, 13 is a driven gear, 14 is a paper feed tooth groove, 15
16 is a paper feed roller, 17 is a paper pressing loaf, 18 is a printing paper, and 19 is an electromagnet.

Figure 2 shows the operation diagram when paper feeding is stopped in Figure 1, and
1, FIG. 4 is an overview of the operation during rapid paper feeding in FIG. 1, and FIG. 5 is an operation diagram in FIG. 4.

FIG. 6 is an overview diagram of another embodiment according to the present invention.
is a driving ball, 24 is a driving gear, 26 is a cylindrical cam portion with tooth grooves 39 and 40, 27 is a normal paper feed tooth portion, 28 is a paper fast feed tooth portion, 3 river sliding springs, 31 is a marsh lever , 32 is a driven shaft, 33 is a driving gear, 34 is a paper feeding tooth section, 35 is a paper feeding auxiliary tooth section, 36 is a paper feeding roller, 37 is a paper pressing loaf, 38 is a printing paper, and 39 is an electromagnet.

Figure 7 is an operation diagram when paper feeding is stopped in Figure 6;
The figure is a diagram of the operation during normal paper feeding in FIG. 6, FIG. 9 is an overview diagram of the paper feed during rapid paper feeding in FIG. 6, and FIG. 10 is a diagram of the operation in FIG. 9.

Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 8 Figure 10 Figure 9

Claims (1)

[Claims] 1. A paper feeding device for a small printer that feeds printing paper intermittently, the paper feeding roller comprising a paper feeding roller and a paper pressing roller positioned to sandwich the printing paper, and at least one type of tooth or cam. a driven wheel that transmits rotation to the driven wheel; teeth or cams that engage the teeth or cams of the driven wheel in a first thrust position to feed the printing paper a predetermined amount; and teeth or cams of the driven wheel in a second thrust position; teeth or cams that engage with the teeth or cams to feed the printed paper by an integral multiple of the predetermined amount; and teeth or cams that engage with the teeth or cams of the driven wheel except when feeding the printed paper, and the driven wheels a motive vehicle having an arcuate cam for positioning the vehicle; a spring member for biasing the motive vehicle or the driven vehicle in the direction of the first thrust position; and a spring member for urging the motive vehicle or the driven vehicle in the thrust direction. a sliding member for transmitting power; and when the driven wheel is positioned by the circular arc cam, the driving wheel or the driven wheel is moved through the sliding member against the return force of the spring member. A paper feeding mechanism for a small printer, comprising: an electromagnetic drive means for sliding the paper to a second thrust position.