JPH0315315Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a printing device installed in a cash register or the like.

Prior Art In recent years, in this type of printing device, receipts,
There is a need to be able to print on two types of paper: thin continuous paper for journals and thick cut paper such as slip paper. For this reason, it is necessary to change and adjust the interval between the guide portions for guiding and holding the paper in accordance with the thickness of the paper.

Purpose of the invention The purpose of the invention is to provide a printing device that can change and adjust the interval between the paper guide sections with an extremely simple configuration.

Embodiment An embodiment of this invention in a printing device built into a cash register will be described below with reference to the drawings. This printing device prints on continuous paper 1 (shown in FIG. 3) used as receipt 1a and journal 1, and cut paper 2 such as slip paper.

Now, a support plate 12 is installed and fixed in the lower part between the left and right side plates 11 of the printing device, and a second support plate 12 is provided above the support plate 12 for guiding upwardly the receipt 1a and journal 1b from the lower roll (not shown). A lower guide member 13a is provided as a guide member constituting a second guide portion having a guide path 13a as a guide path.

Above the support plate 12, a drive shaft 14 is supported between the left and right side plates 11. This drive shaft 1
Reference numeral 4 uses a shaded coil-start type induction motor (not shown) as a drive source, and the motor is rotated by a predetermined amount for each printing operation of one line of this printing device, and the drive shaft 14 is rotated as shown in FIGS. It is rotated one rotation clockwise in Figure 2. As shown in Figure 3, the drive shaft 1
A rotational position detection plate 38 is attached to one end of the drive shaft 4 for detecting the rotational position of the drive shaft 14 in cooperation with a detector (not shown).

As shown in FIG. 3, a pair of left and right paper feed rollers 15 and 16 are supported on the drive shaft 14 so as to be relatively rotatable, corresponding to the receipt 1a and the journal 1b, respectively. , 16 is a one-way clutch 39 on the drive shaft 14
are connected together with the drive shaft 14.
Rotated clockwise in the diagram. In FIG. 1, a pair of left and right auxiliary rollers 18 are supported on the shaft 17 so as to correspond to the paper feed rollers 15 and 16.
The receipt 1a and the journal 1b are fed upward in cooperation with both paper feed rollers 15 and 16.

Above the rear part of the lower guide member 13,
A pair of left and right type wheels 19 are pivotally supported between the side plates 11, and as shown in FIG. 4, a plurality of type rows 20 are engraved on their peripheral surfaces. Each type string 2
0 has a plurality of printed characters 20a. The type wheel 19 is connected to the drive shaft 14 through a gear transmission mechanism such as a gear 40 shown in FIG. 3, and rotates twice for every revolution of the drive shaft 14. In FIG. 1, an ink roll 21 is rotatably supported between the side plates 11 so as to be located in front of the type wheel 19, and is in light contact with the peripheral surface of the type wheel 19.

A first guide plate 22 serving as a guide member constituting a first guide portion having a substantially U-shaped cross section is fixed between the side plates 11 so as to cover the upper and rear sides of the type wheel 19, as is clear from FIG. an upright plane portion 22 facing the rear surface of each character row 20;
A through hole 2 having a width approximately equal to the width of the type string 20
2b is formed.

Behind the type wheel 19 are the respective type rows 20.
A large number of printing hammers 24 are pivotally supported by a shaft 23, and printing parts 24a are protruded from their upper ends. Said type wheel 1
9. A printing mechanism is constituted by a printing hammer 24 and the like. As shown in FIGS. 2 and 4, a
Between the side plates 11, a second guide plate 25 serving as a guide member constituting a first guide portion together with the first guide plate 22 having a substantially shaped cross section is fixed by pins 33 at bent portions 25c on both sides of its lower end.
A through hole 25b for allowing the printing part 24a to enter is formed in an upright plane part 25a facing each of the printing parts 24a with a minute interval. The upright plane portion 25 of this second guide plate 25
a and the upright plane portion 22 of the first guide plate 22
a, a guide gap 26 is formed as a first guide path that is continuous with the guide path 13a and extends vertically, and the continuous paper 1 fed from the guide path 13a is
a, 1b, and the cut sheet 2 inserted from the upper end opening between the guide plates 22, 25 using the printing hammer 2.
4 and a type wheel 19 are adapted to be guided to and held at the opposing printing section. Further, the printing hammer 24 is configured to strike the type 20a on the type wheel 19 via the continuous sheets 1a, 1b or the cut sheet 2 at the printing portion 24a by the spring force of the leaf spring 27 shown in FIG. This allows printing to be performed.

As shown in FIG. 1, a mechanism for controlling the striking action of the printing hammers 24 is provided behind the printing hammers 24 group. That is, when the type 20a to be printed on the type wheel 19 approaches the position facing the printing portion 24a of the printing hammer 24, the latch member 28 is attracted by the solenoid 29 and is released from the printing hammer 24, and the latch member 28 is released from the printing hammer 24. The printing operation of the printing hammer 24 is performed by the spring force of the leaf spring 27. Thereafter, the latch member 28 is returned to the engagement position with the printing hammer 24 by the spring force of another leaf spring 30, and the printing hammer 24 is moved to its cam member 32 by rotation of the cam member 32 fixed on the shaft 31. The latch member 28 is engaged with the latch member 28 to return to the print standby position, and at that position the latch member 28 is engaged again to hold the latch member 28 at that position.
Further, the shaft 31 supporting the cam member 32 is connected to the drive shaft 14 via a gear transmission mechanism, and rotates once every time the type wheel 19 rotates by one character.

As shown in FIGS. 2, 3, and 5, a cam pin 35 is inserted and fixed into a mounting hole 34 extending through the drive shaft 14 between the paper feed rollers 15, 16. Furthermore, a fixing plate 36 having a through hole 36a is fixed to the upper surface of the support plate 12. A presser plate 37 is placed on the upper surface of the fixed plate 36, and a leg portion 37a protruding from the lower end of the presser plate 37 is loosely fitted into the through hole 36a. The presser plate 37 has an oblique shape so as to come into contact with the plane part 25a of the second guide plate 25 at its upper end, and the head 35a of the cam pin 35 is attached to the middle part of the presser plate 37 to prevent rotation of the drive shaft 14. They are designed to engage with each other. When the head 35a of the cam pin 35 engages with the presser plate 37, the presser plate 37 is pushed down and the second guide plate 25 resists its own elasticity as shown by the solid line in FIG. Deflected, first,
Flat parts 22a, 25 of second guide plates 22, 25
A large gap is formed between a and a, into which the thick slip paper 2 described above can be inserted. Also, when the cam pin 35 comes off the presser plate 37, the second guide plate 2
5 returns to the position indicated by the two-dot chain line in FIG. 2 due to its elasticity, and the gap between the two plane parts 22a and 25a becomes a small width that is optimal for guiding the thin continuous sheets 1a and 1b. The cam pin 35 and the press plate 37 constitute a cam mechanism as a swing mechanism between the drive shaft 14 and the second guide plate.

Note that 41 shown in FIG. 1 indicates a roller for winding up the journal 1b after printing.

Next, the operation of the printing device configured as above will be explained. Now, when the drive shaft 14 is stopped, the head 35a of the cam pin 35 is within range A (around 60 degrees) shown in FIGS. 6 and 7.
As shown in FIG. 2, the head 35a is attached to the presser plate 3
7 is engaged. Therefore, the presser plate 37 is pressed down and the second guide plate 25 is moved in a curved manner to the solid line position, thereby forming a large gap between the first and second guide plates 22 and 25. Therefore, the thick cut sheet 2 can be inserted into the printing section and held at that position.

After inserting the cut sheet 2, by operating the register key, the electric motor is started for printing according to the operation contents, and the drive shaft 14 is rotated clockwise as shown in FIGS. 2 and 6. type wheel 1
9 is rotated. The drive shaft 14 reaches steady rotation when the cam pin head 35a is pulled out of the A range, and the cam pin head 35a comes off the presser plate 37 when it moves into the B range (180 degrees). Therefore, the second guide plate 25 elastically returns in the direction of the solid line position in FIG. 2, and the cut sheet 2 is held between the two guide plates 22 and 25.

On the other hand, the origin position of the type wheel 19 is detected when the cam pin head 35a reaches the B range, and while the cam pin head 35a rotates 180 degrees from there within the B range, that is, the type wheel 19 rotates once. In the meantime, when the type characters 20a to be printed on the type wheel 19 face the printing portion of the cut sheet 2, the printing hammer 24 is actuated by impact to perform printing.

Next, the cam pin head 35a is in the C range (40 degrees to 60 degrees).
1), the one-way clutch 39 on the drive shaft 14 is engaged, and the paper feed rollers 15, 16 are rotated a predetermined amount clockwise in FIG. 1, but they do not act on the cut sheet 2.

Then, when the cam pin head 35a exits the C range and moves to the remaining D range, the input to the electric motor is cut off, and the cam pin head 35a engages with the holding plate 37 due to the subsequent elliptical rotation of the drive shaft 14. It rotates while moving and stops at the initial position within the A range. Therefore, as shown in FIG.
With the guide plate 25 curved to the solid line position, the drive shaft 14 is stopped, the grip on the cut sheet 2 is released, and the cut sheet 2 can be pulled out upward.

Thereafter, the above-described operations are repeated for each printing operation of one printing line of this printing device in response to a key operation. In addition, the timing of the origin detection described above, each A~
Setting of the D range, etc. is performed by a rotational position detection plate 38 and a detector at the end of the drive shaft 14.

Also, printing on the continuous paper sheets 1a and 1b is performed in the same manner as described above, and each time the printing operation is completed,
The sheets 1a and 1b are fed upward by the rotation of the paper feed rollers 15 and 16 based on the engagement of the one-way clutch 39.

As described above, in this printing device, the drive shaft 1 is rotated to perform printing according to key operations.
Based on the rotation of 4, the gap between the guide plates 22 and 25 becomes wider when the printing operation is not performed, so that even thick cut sheets 2 can be inserted into the printing section. , 25 becomes narrower, the continuous sheets 1a, 1b and the cut sheets 2 can be held in a stable state, and printing can be performed reliably. Furthermore, the configuration for this purpose is extremely simple since it only requires the cam pin 35 and the presser plate 37.

In addition, in the printing device of this embodiment, the electric motor rotates by the necessary amount and then stops each time a printing operation is performed in accordance with a key operation, so that electric power can be saved and unnecessary noise can be suppressed. I can do it.

Note that this invention is not limited to the above-mentioned embodiment, and the second guide plate 25 is rotatably supported, and a spring force is applied to the guide plate 25 in the direction of narrowing the guide interval. , by rotating the guide plate 25 against a spring force to widen the guide interval, and by rotating the drive shaft 14, the first guide plate 22 can also be opened. Alternatively, the cam mechanism between the drive shaft 14 and the second guide plate 25 may be replaced with a link mechanism as a swing mechanism.

Effects of the device As detailed above, when using cut sheets, the present invention provides a
Since the spacing between the guide paths is wide, it is extremely easy to insert and remove the cut sheet from the printing device.Also, since the spacing between the first guide paths is small during printing, the sheet does not flap around. Clear printing can be performed reliably.

In addition, in the case of continuous paper, the interval between the first guide paths is kept small during printing and paper feeding, so the paper can print clearly without flapping like cut paper, and the paper can be fed reliably. can.

In this way, the present invention is made of thick cut paper or
It enables clear printing on thin continuous paper, and especially for cut-sheet paper, it has a simple structure and extremely simplifies the series of operations of inserting into the printing device, printing, and taking it out. This can be done easily and reliably, and in addition, printing and feeding of continuous paper can be performed smoothly.

In addition, in the present invention, the power supply to the drive source is stopped to allow the drive shaft to rotate by inertia, and the drive shaft is again activated by the swing mechanism to stop its rotation, so that the step motor etc. To easily perform stop control even with an inexpensive motor such as a shaded coil start type induction motor without using an expensive motor.

Furthermore, in the present invention, since the drive source is driven to rotate intermittently, it is possible to save power and suppress noise compared to when the drive source is constantly rotated, and the paper feeding mechanism and the swinging mechanism are driven by a common drive source. The number of parts can be reduced and costs can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of a printing device embodying this invention, in which Fig. 1 is a side sectional view showing the whole, Fig. 2 is an enlarged side sectional view showing the main parts, and Fig. 3 is the same. FIG. 4 is an exploded perspective view of the printing part; FIG. 5 is an exploded perspective view of the drive shaft; FIG. 6 is an explanatory diagram showing the rotation range of the cam pin;
FIG. 7 is an explanatory diagram showing the sequence of operations as the drive shaft rotates. Cut paper...2, drive shaft...14, first guide plate...22, second guide plate...25, flat part...22a, 25a, cam pin...35, press plate...37.

Claims (1)

[Scope of claim for utility model registration] Cut paper 2 and continuous paper 1 installed in the printing position
A first guide section has a first guide path 26 common to cut sheets and continuous sheets, and the interval between the guide paths is variable. guide members 13, 22, 25 forming a second guide portion having a second guide path 13a continuous with the path 26; printing mechanisms 19, 24, etc. provided in the middle of the first guide path 26; Paper feeding mechanisms 15 and 16 for the continuous paper 1 provided in the middle of the second guide path 13a; a drive shaft 14 that is rotationally driven by a drive source and connected to the paper feeding mechanisms 15 and 16; and the first The interval between the first guide paths 26 is reduced by contacting the guide members forming the guide portions 22 and 25 and pressing the guide members according to the rotational drive of the drive shaft 14, and releasing the pressure. variable rocking mechanisms 35, 37; the drive shaft 14 rotates one rotation in one direction for each printing operation by the printing mechanisms 19, 24, etc. in response to the intermittent rotational drive of the drive source; The drive shaft 14 is driven to rotate intermittently, and the drive shaft 14 operates the swing mechanisms 34 and 37 according to the rotation angle during one rotation to maintain the first guide path 26 in a state where the distance between the first guide paths 26 and the first guide path 26 is increased.
The rotation range A of , and the swinging mechanisms 34 and 37 are operated to reduce the interval between the first guide path 26 and hold the cut sheet 2 or the continuous sheet 1 in the first guide path 26, and a second rotation range B in which printing is performed on paper by the printing mechanisms 19, 24, etc.;
a third rotation range C in which the continuous paper 1 is fed within the guide path 13a; and a third rotation range C in which the continuous paper 1 is fed within the guide path 13a;
4 and 37 again to hold the gap between the first guide paths 26 in a widened state, and then rotate in the order of a fourth rotation range D in which the rotation is stopped.