JPS5953878B2 - printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing machine for a data processing device,
Provided is a printing machine that can easily attach and detach printing materials with uneven thickness, such as horizontally folded bank passbooks, vertically folded passbooks, or slips, and that can print with good print quality on the printing materials. This is what we intend to provide.

Conventionally, there are type bar type printing machines and single element type printing machines that satisfy the above requirements, but both have a drawback of slow printing speed.

Here, the number of types of characters on the surface is large, the printing speed is fast,
The wire impact dot matrix method is a low-noise and inexpensive printing machine. It is necessary to maintain a gap of about 0.3 mm to 0.6 mm, and it is difficult to print on printing materials of different thicknesses, that is, on either a single slip or multiple duplicate slips. As a means to eliminate such drawbacks and to easily attach and detach the printing object, the platen is moved backward to release the printing object when attaching and removing the printing object and when starting a new line, and the platen is moved forward during printing. A structure in which the printed surface is pressed against a receiving member for keeping the printed surface in a proper printing position has already been described in Japanese Patent Laid-Open No. 19609/1983.
That is, according to the explanation in JP-A-51-19609, a platen divided into three parts is supported from a frame by a platen lever, the platens at both ends are each driven by a solenoid, and the center platen is driven by a solenoid on both sides. The three platens are each clamped by a solenoid.

However, some disadvantages are recognized due to the above configuration. That is, firstly, the operation is shocking and there are drawbacks such as generation of impact noise, and the operation speed is also difficult to control. Second, in order to maintain the pressed state of the printed object, it is necessary to continue energizing or use another holding means, and if a holding means is provided, it is necessary to release the holding to release the holding when restoring. It is necessary to provide means. The present invention was invented in view of the above-mentioned problems, and an object of the present invention is to provide a method in which the printed body and the printed surface of the printed body are close to each other, such as wire impact type dot matrix type or press type simultaneous printing type, etc. In a printing method that prints by pressing or tapping, it is possible to easily attach and detach printed materials with uneven thickness, such as horizontally folded bank passbooks and vertically folded passbooks, single slips, or stacked slips. To obtain a printing machine capable of printing on the above-mentioned printing medium with good printing quality, eliminating the drawbacks of the above-mentioned Japanese Patent Application Laid-Open No. 51-19609, and having excellent reliability and durability. It is in.

The gist of the present invention for achieving the above object is that the platen is divided into three parts, and the platen at both ends of the platen is linked with the operation of moving the platen at both ends of the platen closer to and away from the printing body. and a platen locking means for locking the platen when the platen is in a position close to a printing body.

The present invention will be described below as a wire impact dot tomato. An embodiment applied to a printing machine of the printing system will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing the overall appearance of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an internal structure showing the internal structure of FIG. Figure 3 shows the structure of Figure 2. FIG. 4 is a sectional view of FIG. 3; FIG. FIG. 5 is a detailed view of the platen portion, and FIG. 6 is a sectional view of FIG. 3 showing the operating state of the platen locking lever. In Figure 1,
Reference numeral 1 denotes a frame, which forms the base of the structure of this device.

2 is an electric motor that serves as the prime mover of this device, and is a part 1a of the frame 1.
The rotary output shaft 2b (Fig. 2) rotates in the direction of the arrow when a voltage is applied to the lead wire 2a. It is configured as follows.

A gear A 3 is fixed to the rotation output shaft 2b of the electric motor 2.

Reference numeral 4 denotes a paper table, which is a guide member for a printing medium 7 and has a space in which a platen 50 (described later) operates, and is fixed to the frame 1.

5 is a receiving member, which is a positioning member for keeping the printing surface of the printing object 7 at a certain distance from the printing head 8;
is fixed to.

Reference numeral 6 denotes a paper guide (see FIG. 3), which is a member for guiding insertion of a printing medium provided perpendicularly to the printing line, and is fixed to the paper table 4.

Reference numeral 7 denotes a printing medium to be printed by this printing machine, and in the example shown in FIG. 3, it represents a bank passbook, etc., and has a folded part 7a in the center.

Reference numeral 8 denotes a member for printing on the printing object 7, which is a wire impact type dot matrix printing head, and is fixed to a carriage (not shown), which is connected to a guide rail ( (not shown) so as to be able to move freely in the printing line direction, and is connected to a driving means (not shown) for the movement.

Reference numeral 9 denotes a transmission shaft which is rotatably supported by the frame 1.

Reference numeral 10 is a so-called spring clutch using a spring (not shown), which is fixed to the transmission shaft 9 and supports a gear BlOa serving as an input end so as to be able to rotate coaxially with the transmission shaft 9. It meshes with the gear A3 and rotates with the rotation of the rotational output shaft 2b of the electric motor 2,
Further, on the same axis, adjacent to the gear BlOa, a pawl plate 10b having two pawls serving as control ends is rotatably supported.

Furthermore, although not shown, a spring is wound around the shaft protruding from the gear BlOa and the shaft fixed to the transmission shaft 9, one end on the gear AlOa side is fixed to the pawl plate 10b, and one end on the transmission shaft side is fixed to the claw plate 10b. One end of the is fixed to a shaft fixed to the transmission shaft. That is, if the rotation of the pawl plate 10b is blocked while the gear BIOa is rotating with the rotation of the rotational output shaft 2b of the electric motor 2, the rotation of the gear BIOa will not be transmitted to the transmission shaft 9, and the pawl plate 10b will be blocked. When the gear BlOa is released, the rotation of the gear BlOa is transmitted to the transmission shaft 9 by the tightening force of the spring, and the transmission shaft 9 is configured to rotate together with the gear BlOa. 11 is the clutch trigger shaft, which is part 1 of the frame 1
It is planted in a.

12 is a trigger lever, which is connected to the clutch trigger shaft 11;
A spring clutch 10 is fitted to the tip so that it can swing freely.
A bent portion 12a for locking the claw plate 10b is formed, and an operating pin 12b for operating the trigger lever 12 body from the outside is installed in the center.

Reference numeral 13 denotes a trigger lever return spring, which has one end suspended from the frame 1 and the other end suspended from the trigger lever 12, and biases the bent portion 12a of the trigger lever 12 in a direction to engage the claw plate 10b. There is.

14 is a trigger solenoid fixed to the frame 1;
When a voltage is applied to the lead wire 14b of the coil 14a,
The armature 14d swings about the armature shaft 14C and is configured to be attracted to the coil 14a side, and a groove formed at the tip of the armature 14d is loosely fitted into the operating pin 12b of the trigger lever 12. The lever is biased by the trigger lever return spring 13 in a direction opposite to the suction direction, and comes into contact with a stopper (not shown).

A worm 15 is fixed to the transmission shaft 9.

A camshaft 16 is rotatably supported by the frame 1.

A worm wheel 17 is fixed to the camshaft 16 and is configured to mesh with the worm 15 and rotate the camshaft 16 in accordance with the rotation of the transmission shaft 9.

Reference numeral 18 denotes a rotating cam, which is offset by 60 degrees with the rotating cam 18a of the same shape, and connects the cam bush 18b and the connecting pin 18.
Further, the cam bush 18b is fitted onto the cam shaft 16 and configured to rotate together with the cam shaft 16.

Reference numeral 19 denotes a detection auxiliary member board, which is fixed to the camshaft 16 via a bush 19a and is configured to rotate together with the rotary cam 18.

Magnets 20 and 22 are fixed to the disk surface of the detection auxiliary member substrate 19 at an interval of 180° by coupling pins 21 and 23, respectively.

Reference numeral 24 denotes a platen position detection member holder, which is fixed to the frame 1.

Reed switches 25 and 26 are attached to the platen position detection holder 24.
6 are connected to each other to form a lead wire 27, which is connected to a control circuit (not shown).

Also, from the other terminal of the reed switches 25 and 26,
They are connected to a control circuit (not shown) via lead wires 28 and 29, respectively. 30 is the platen push-up camshaft,
It is fixed to a part 1C of the frame 1.

Reference numeral 31 denotes a platen push-up cam, which is fixed to the platen push-up cam bush 32.
2 is fitted into the platen push-up camshaft 30 so as to be able to swing freely.

In addition, the platen push-up cam 31 has a follower roller 33 rotatably attached to one end by a roller shaft 34, and a cam portion 31a for pushing up a lifting roller 45, which will be described later, is formed in the other part. has been done. 35 is a platen push-up cam return spring, one end of which is connected to the other end of the platen push-up cam 31, and the other end of the platen push-up cam return spring,
It is suspended on a part 1e of the frame 1, and urges the platen push-up cam 31 in the direction of the arrow, and the follower roller 33
is brought into contact with the rotating cam 18.

36 is a leaf spring, one end of which is attached to one end of the part 1C of the frame 1 by a clamping plate 37 and a connecting pin 38, and the other end is attached to one end of a lifting plate 43 by a clamping plate 41 and a connecting pin 42. The center portion is sandwiched between sandwiching plates 39 from both sides and crimped and clamped using a connecting pin 39.

A leaf spring 36 is attached in a similar structure between the other end of the portion 1C of the frame 1 and the other end of the lifting plate 43, and a lifting roller shaft 44 is also installed on the lifting plate 43. A lifting roller 45 is rotatably attached to the lifting roller shaft 44. Reference numeral 46 denotes a platen support plate, which is connected to the lift plate 43.
They are attached individually with connecting pins 47.

Reference numeral 48 denotes a spring-loaded pin, which is set up on the platen support plate 46.

49 is a platen return spring, one end of which is connected to the spring hook pin 48.
The other end is suspended on a part 1d of the frame 1, and urges the combined body of the platen support plate 46 and the lifting plate 43, so that the lifting roller 44 lifts the cam part 31a of the platen pushing cam 31. is pressed against.

50 is a platen left unit, which is attached to the platen support plate 46.
In the state shown in FIG. 4, that is, in the position of the platen support plate 46 mentioned above, its upper surface, that is, the surface in which the font to be stamped is pressed, is flush with the upper surface of the paper table 4. , a spring hook pin 51 is installed at one end.

Further, a platen auxiliary body 52 is fixed to the lower part. 5
Reference numeral 3 denotes a right platen unit with a spring pin 54 erected at one end, and a platen auxiliary unit 55 fixed to the lower part.

The combination of the right platen unit 53 is connected to another drive mechanism and support mechanism in the same way as the combination of the left platen unit 50 described above, and is driven by the driving force of the rotating cam 8a. The upper surface of the left platen unit 50, that is, the surface on which the printed object is pressed is flush with the upper surface of the right platen unit 50. 56 is the central platen unit, which includes guide plate A6O and guide plate B.
A support pin 57 and a spring hook pin 5 are loosely fitted into a 6L square hole with a slight gap to support the guide plate A6O.
8 is planted, a positioning body 59 is fixed to the lower surface, and both ends of the guide plate A6O and the guide plate B6l are connected to the platen left unit 50 and the platen right unit 53, respectively.
One end is loosely fitted between the angular notches with a slight gap, and the center platen unit 56 works together with the platen left unit 50, platen right unit 53, and each platen auxiliary body 52, 55 to raise the center platen unit 56 upward. - Guides the vehicle so that it can go straight downward and not tilt in any direction.

A left platen spring 62 is suspended between the spring hook pin 5 of the left platen unit 50 and the spring hook pin 58 of the center platen unit 56.

A right platen spring 63 is suspended between the spring hook pin 54 of the platen right unit 53 and the spring hook pin 58 of the center platen 56.

Although not shown, the four platen springs, which are similarly suspended at each symmetrical position, work together to bias the central platen unit 56 upward, and the positioning body 5
9 is in contact with the platen auxiliary bodies 52 and 55, and the upper surface of the central platen unit 56, that is, the surface against which the printed object is pressed, is flush with the upper surfaces of the left platen unit 50 and the right platen unit 53, respectively. That is, the central platen unit 56
are on the same plane if the platen units on both sides are on the same plane, but when one of the platen units is lowered, the center platen unit 56 is pushed down by the lower platen unit, and the center platen unit 56 is pushed down by the lower platen unit. The center platen unit 56 is configured to be pushed down against the four platen springs by strongly pushing down the printing object pressing surface 56. 64 is the central platen unit locking lever and the locking lever bushing 65
The locking lever bush 65 is rotatably supported by a locking lever shaft 66 that is mounted on a portion 1a of the frame 1.

The central platen unit locking lever 64 has a bent portion 64a formed at one end, a locking portion 64b at the other end, and a spring hook portion 64C formed near the locking portion 64b. A locking lever spring 68 is suspended between the spring hanging portion 64C and a spring hanging pin 67 that is set up on a portion 1f of the frame 1, and biases the central platen unit locking lever 64 clockwise. , the bent portion 64a is in contact with the follower roller 33. The platen push-up cam 31 is the third
In the state shown in the figure, that is, in the state in which the top surfaces of the platens 50, 53, and 56 are in the same plane as the top surface of the paper tray 4, the central platen locking lever 64 is in the state shown in FIG.
b is slightly separated from the positioning body 59 fixed to the central platen unit 56. As described above, the platen locking means is composed of the central platen unit locking lever 64, the locking lever bush 65, the locking lever shaft 66, and the like.

Next, the functions of the above structure will be explained based on the respective drawings.

When printing on a printing medium that has different thicknesses in the printing direction, such as a vertically folded passbook, place the printing medium 7 on the top surface of the paper table 4 and align the right end along the paper guide 6, as shown in FIG. When inserted, a paper feeding device (not shown) feeds the desired position, ie, the line to be printed, directly below the travel trajectory of the printing body 8. The platen is set in advance so that the central platen unit 56 corresponds to the thickness changing portion 7a of the printing medium 7. After the printing object 7 is positioned at a desired position, a control circuit (not shown) applies a voltage to the lead wire 2a of the electric motor 2 in FIG. 2, and the rotation output shaft 2b starts rotating. Accordingly, the gear A3 fixed to the rotary output shaft 2b also rotates, and accordingly, the gear BlOa of the spring clutch 10 rotates clockwise. However, as explained above, since the spring clutch is in the disengaged state (7), the transmission shaft 9 does not rotate. Subsequently, a voltage is applied to the lead wire 14b of the trigger solenoid 14 by a control circuit (not shown), and the armature 14d is attracted to the coil 14a side and swings around the armature shaft 14C, and the trigger is activated. The trigger lever 12 is swung about the clutch trigger shaft 11 through an operating pin 12b mounted on the lever 12 against the biasing force of the trigger return spring 13. Accordingly, the bent portion 12a of the trigger lever 12 releases the pawl plate 10b of the spring latch 10, bringing the spring latch 10 into the ``1'' state. In other words, power can be transmitted at any time using weak electric power, and it can be started without noise or impact. When the spring clutch 10 is in the disengaged state 7, the rotation of the gear BlOa rotates the transmission shaft 9 via the spring clutch 10, causing the worm 15 fixed to the transmission shaft 9 to rotate clockwise.

The rotation of the worm 15 causes the worm wheel 17 and the camshaft 16 fixed to the worm wheel 17 to be rotated.
rotates counterclockwise.

Therefore, the rotary cams 18, 1 fixed to the camshaft 16
8a and the detection auxiliary member substrate 19 also rotate together. The follower roller 33, which is half as fast as the rotation of the rotating cam 18, moves its contact portion from the large-diameter portion of the rotating cam 18 to the small-diameter portion, and the platen push-up cam 31 moves in the direction of the arrow, that is, clockwise. rotate in the direction. That is, when the platen push-up cam 31 in FIG. When the platen support plate 46 is pushed up against the biasing force of the platen return spring 49 and the rotating force 18 continues to rotate and reaches the state 18-1, the follower roller 33 returns to the state 33-1. Therefore, the cam portion 31a is 3
1a-1, the lifting roller 45 is in the state 45-1. The above operation and state will be explained with reference to FIG. 4. The lift plate 43 and the platen support plate 46, which are pushed up by the cam part 31a via the lift roller 45, have one end attached to the part 1C of the frame 1. It is supported by two upper and lower leaf springs 36, that is, so-called parallel springs, whose central portions are fixed and whose central portions are held between sandwiching plates 39. It is bent in the . Because of this support structure, the platen left unit 50 will not tilt in any direction. In addition, since there is no unnecessary gap in the support intervening part, it does not swing back and forth and left and right due to backlash, and since there is no sliding part, there is no need for oil supply and there is no wear, resulting in durability. The platen left unit 50 fixed to the platen support plate 46 is connected to the platen push-up cam 3.
By pushing up the cam portion 31a of 1, the object to be printed 7 is placed on the upper surface and rises, and the left upper surface of the object to be printed 7 is moved to the receiving member 5.
It presses against and stops.

Similar to the above-described operation of the left platen unit 50, the right platen unit 53 is simultaneously operated by the rotary cam 18a, and the right upper surface of the printing medium 7 is pressed against the receiving member 5 and stopped.

However, as shown in FIG. 3, since the printing medium 7 is thinner on the left side and thicker on the right side, the platen left unit 50 has traditionally been raised upwards close to the receiving member 5, but the platen right unit 53 is located further away from the receiving member 5 and remains below the platen left unit 50. The center platen unit 56 cannot be above the upper surface of the lower platen unit, that is, the right platen unit 53, due to the positioning member 59 to which the upper surface is fixed. However, since the stepped part or folded part of actual bank and post office passbooks, etc. protrudes slightly downward, the upper surface of the platen center unit 56 is relatively biased against the urging force of the left platen spring 62 and the right platen spring 63. The platen right unit 53 is pushed down and remains below the upper surface of the platen right unit 53. In this way, the upper surface, that is, the printing surface, of the printing object 7, which has a thickness difference on the left and right sides, becomes the same plane, and it becomes possible to perform printing by the printing object 8 moving straight. When the platen is in this state, the rotating cam 18
The magnet 20 fixed to the detection auxiliary member substrate 19, which rotates together with the reed switch 26, approaches the reed switch 26, closes the contact point of the reed switch 26, and connects the lead wire 27 with the first and second wires 2.
8 is in a conductive state. That is, a control circuit (not shown) detects that the platen is ready for printing and outputs a signal to bring conduction between the lead wires 27 and 28.
This is how it is conveyed. In response to this signal, a control circuit (not shown) stops the voltage applied to the lead wire 14b of the tricurb solenoid 14. Therefore, armature 14
d and the trigger lever 12 are restored by the biasing force of the trigger return spring 13, and the bent portion 12a of the trigger lever 12 is restored.
locks the pawl plate 105b of the spring clutch 10. Therefore, the spring clutch]0 is in the disconnected state,
The transmission shaft 9 tries to stop rotating immediately, and the camshaft 16 also tries to stop, but it cannot stop immediately due to the inertia of the rotating cam 18a, the detection auxiliary member board 19, etc., and the worm wheel 17θ stops the worm 16 in the axial direction. When pressed, the worm 16 is supported by the frame 1. The spring clutch 10 is therefore not subjected to any undesirable forces, and
The rotating cam 18a stops without overrunning due to inertia. At the same time, the control circuit (not shown) also stops the voltage application to the lead wire 2a of the electric motor 2, and the electric motor 2 also stops. Since this stopping method is used, it is possible to immediately stop the printer at an appropriate time without impact or noise, and since the raised state of the platen, that is, the state in which printing is possible, can be determined, related operations with other mechanisms are guaranteed. The operation of the central platen locking lever 64, which operates together with the upward movement of the platen, will be explained using the sixth example.

As described above, as the rotating cam 18 rotates, the follower roller 33 moves its contact portion from the large diameter portion of the rotating cam 18 to the small diameter portion. However, as the central platen locking lever 64 moves clockwise due to the biasing force of the locking lever spring 68, the locking portion 64b comes into contact with the positioning body 59. Accordingly, the follower roller 33 is further lowered, but the central plate and latch locking lever 64 is stopped at this position. On the other hand, the central platen unit 56 continues to rise, and stops with the stepped portion of the printing medium 7 pressed against the receiving member 5 as described above. When the central platen unit 56 is in the above position, the positioning body 59 is in position 2 until the locking portion 64b of the central platen locking lever 64 comes out of the abutting state and enters the lower part of the positioning body 59. It doesn't rise. That is, in this state, the center platen unit 56 is not locked by the center platen locking lever 64, so if it is pressed from the top surface, it will resist the urging force of the left platen spring 62 and the right platen spring 63. It is possible to press down. However, as shown in FIG. 3, since the object 7 to be printed is a bankbook, printing is not performed on the central folded portion, so printing can be performed by pressing. When the object to be printed is a vertically folded passbook, the reason why the central platen unit 56 is not locked is to push up the folded part of the passbook.
This is to prevent the printing body 7 from becoming an obstacle to running. Further, as shown in FIG. 6, when the printing object 7 is thinner than the passbook, such as a thin single slip or a stack of several slips, the central platen unit 56 is close to the receiving member 5, so that it can be positioned easily. The body 59 is raised higher than when the printing target 7 is a passbook, and the locking portion 64b is
As the positioning body 59 rises, the locking part 64b moves to the right, the central platen unit 56 stops, and when the position 56-1 is reached, the positioning body 59 moves to the right.
The state becomes 9-1, and the locking portion 64b becomes the state 64b-1. Therefore, the central platen unit 56 is locked with the upper surface of the object to be printed 7 in pressure contact with the receiving member 5, so that the upper surface of the object to be printed 7 is at the position of the lower surface of the receiving member 5 to the left of the platen. unit 50, platen right unit 53,
The portions of the central platen unit 56 that are pressed together by any of the platens are all on the same plane, and are held at positions suitable for printing by the printing body 8. Therefore, printing by the stamping method is possible at any of the above locations.
In other words, if the printing object 7 has a thickness such that the locking portion 64b can engage with the positioning body 59, printing can be uniformly performed at any location.

Subsequently, when the platen becomes ready for printing by the reed switch 26, the control circuit (not shown) causes the printing body 8 to also run in the longitudinal direction of the platen, that is, along the printing line, to perform a printing operation. The printing body 8 prints on the printing medium 7 .

When the printing operation is completed, a control circuit (not shown) applies a voltage to the lead wire 2a of the electric motor 2 in FIG. 2, and the rotational output shaft 2b starts rotating in the direction of the arrow.

Accordingly, the gear A3 fixed to the rotating output shaft 2b also rotates, and the gear BlOa of the spring clutch 10 rotates clockwise accordingly. However, since the spring clutch is in the disengaged state 7, the transmission shaft 9 does not rotate. Next, the control circuit (
(not shown), a voltage is applied to the lead wire 14b of the trigger solenoid 14, and the armature 14d is attracted to the coil 14a side and oscillates around the armature shaft 14C, and is planted on the trigger lever 12. The trigger lever 12 is caused to swing about the clutch trigger shaft 11 against the biasing force of the trigger return spring 13 through the operated operation pin 12b. Therefore, the trigger lever 12
The bent portion 12a of the spring clutch 10 is connected to the pawl plate 10 of the spring clutch 10.
b is released, and the spring clutch 10 is in the connected state. When the spring clutch 10 is in the degree-connected state, the rotation of the gear BIOa rotates the transmission shaft 9 via the spring clutch 10, causing the worm 15 fixed to the transmission shaft 9 to rotate clockwise. As the worm 15 rotates, the worm wheel 17 and the camshaft 16 fixed to the worm wheel 17 rotate counterclockwise. Therefore, the rotary cam 18, which is fixed to the camshaft 16,
18a and the detection auxiliary member substrate 19 also rotate together. As the rotary cam 18 rotates, the follower roller 33 moves its abutting portion from the small diameter portion of the rotary cam 18 to the large diameter portion, and the platen push-up cam 31 rotates in the direction opposite to the arrow. do. That is, when the platen push-up cam 31 in FIG. 3 is rotated counterclockwise against the biasing force of the platen push-up cam return spring 35, the lift plate 43 and the platen support plate 46 Due to the biasing force of the spring 49, it descends via the lifting roller 45 while following the cam portion 31a. When the rotating cam 18 continues to rotate and reaches the state shown in FIG. 3, the platen push-up cam 31, the platen support plate 46, and the left platen unit 50 will also be in the state shown in FIG. Similar to the operation of the left platen unit 50, the right platen unit 53 is also operated simultaneously by the rotary cam 18a.

Further, the center platen unit 56 moves down together with the left platen unit 50 and the right platen unit 53 while maintaining the mutual relationship shown in FIG. 3, resulting in the state shown in FIG. 3. The above explanation is for the case where the printing object 7 is thick, such as a bankbook, and the central platen locking lever 64 does not lock the central platen unit 56. Next, the operation when the printing object 7 has a small thickness such as a single slip and the central platen locking lever 64 locks the central platen unit 56 will be described with reference to FIG. As described above, the platen holds the thin printing medium 7 between it and the receiving member 5, and the locking portion 64b of the central platen locking lever 64 is 64b-
1, and the positioning body 59 is locked in the state 59-1. In such a state, the rotary cam 1 is rotated as described above.
8 rotates, the follower roller 33 rises, and the platen push-up cam 31 rotates against the biasing force of the platen push-up cam return spring 35.
6 attempts to descend following the cam portion 31a via the lifting roller 45 due to the biasing force of the platen return spring 49, but as described above, the central platen unit 56 is not locked by the central platen locking lever 64. It is stopped and cannot be lowered. Therefore, as shown in FIGS. 3 and 5, the left platen unit 50 and the right platen unit 53, which are prevented from being lowered by the positioning body 56, cannot be lowered either. Subsequently, when the rotating arm 18 rotates and the follower roller 33 descends, the locking portion 64b locks the positioning body 5.
9, the central platen unit 56, left platen unit 50, and right platen unit 53 are returned by the biasing force of the platen return spring 49 to the states shown in FIGS. 3, 4, and 6. When the platen is in this state, the magnet 20 fixed to the detection auxiliary member substrate 19, which rotates together with the rotating cam 18, approaches the reed switch 25, closes the contact of the reed switch 25, and connects the lead wire 27. The lead wires 29 are electrically connected. That is, when it is detected that the platen 50 has descended to the lowest position, the lead wire 27 and the lead wire 2
This signal is transmitted to a control circuit (not shown) as a signal that brings conduction between the terminals 9 and 9 into a conductive state. The signal causes a control circuit (not shown) to connect the lead wire 14b of the trigger solenoid 14.
Stop the voltage that was being applied to the Therefore, the armature 14d and the bent portion 12a of the trigger lever 12 engage the pawl plate 10b of the spring latch 10. Therefore, the spring clutch 10 is in the disengaged state 7, the transmission shaft 9 immediately stops rotating, and the camshaft 16 also comes to a standstill. At the same time, a control circuit (not shown) controls the lead wire 2 of the motor 2.
The voltage application to a is also stopped, and the electric motor 2 also stops. Thereafter, the printed object is fed to a line feeder or ejected by a paper feeding device (not shown). As is clear from the above explanation,
According to the platen locking means according to the present invention, there is no need for a dedicated power source, a mechanism for determining the printing object, and a control mechanism for determining whether or not the operation is possible. The folded part of the machine is not pushed up unnecessarily, and since all digits of slips and horizontally folded passbooks are supported by the platen, printing can be performed on all digits.

In other words, stamps on vertically folded passbooks, horizontally folded passbooks, slips, etc. It is possible to construct an inexpensive and highly reliable printing machine that can print characters with good quality.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall appearance of an embodiment of the present invention. FIG. 2 is an explanatory diagram of an internal structure showing the internal structure of FIG. FIG. 3 is a diagram showing the operating state of the structure of FIG. 2. FIG. 4 is a sectional view of FIG. 3. FIG. 5 is a detailed view of the platen portion. FIG. 6 is a sectional view of FIG. 3 showing the operation of the platen locking lever. 2... Electric motor, 7... Printed body, 8... Printed body, 18... Rotating cam, 31...
...Platen push-up cam, 36...Plate spring, 50...
・Platen left unit, 64...Platen locking lever 5...Receiving member, 53...Platen right unit, 5
6...Central platen unit.

Claims (1)

[Claims] 1. In a printing machine that prints on a printing medium while moving the printing medium close to the surface of the printing medium and moving it relative to the surface of the printing medium, a
a receiving member for positioning the surface of the printing object with respect to the printing object, b. a left platen unit, a right platen unit, and a central platen unit for receiving the printing force of the printing object; c. driving the left platen unit and the right platen unit to move the printing object against the receiving member; a platen drive mechanism that moves forward and backward in a pressing and releasing manner; A printing machine comprising a platen locking lever that prevents the left platen unit and the right platen unit from moving backward and releases the lock in advance when the platen left unit and the platen right unit move back.