JPS6166670A - Printing apparatus - Google Patents

Abstract

PURPOSE:To obtain a printing apparatus having a simple structure and the whole apparatus can be formed compactly and the maintenance and inspection thereof are easy by supporting a platen which windes up a printing paper and a bale roller rotably, and providing the bale roller in a special state. CONSTITUTION:A blank 26 is set until directly before a feed roller 27 and a bale lever 29 is rotated in the direction of an allow I. A clickstop is locked with a latch 33 is fallen into a notch 34a as soon as the bale roller 30 is separated from a platen 25. A projected section 37 of the lever 29 is engated with a microswitch 35, a platen 25 is rotated in the direciton of an allow H, and stopped in a printing starting position after the blank is fed. The bale roller 30 is stopped in a state of separation from the platen 25 by falling in the notch 3l4a when the rotation of the lever 29 is interrupted. The blank 26 is pressed against the platen 25 by the bale roller 30 when the lever 29 is displaced in the direction of an allow J and a standby condition is established.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to printing devices such as printers and typewriters equipped with an automatic paper feeder.

Conventional configuration and its problems Recently, due to the busy office information work, printers.

Typewriters and the like have been used more frequently, and the number of machines equipped with automatic paper feeding devices has increased, especially so that printing paper can be easily set. Automatic paper feeding means that the paper is automatically fed to the printing device simply by pressing a switch or pulling a lever after setting the printing paper.

A conventional automatic paper feeder will be described below.

FIG. 5 shows a side view of a conventional automatic paper feeder.

Here, 1 is a platen, 2 is paper wound around the outer periphery of the platen 1, 3 is a bail roller disposed opposite to the platen 1, 4 is a bail lever that holds the bail roller 3, 5 is a solenoid, and 6 is a bail roller that holds the bail roller 3. is plunger 5a of solenoid 6
and a link connecting the bail lever, 7 is a spring attached to one end of the link 6 and biases the link 6 in the direction indicated by the arrow, 8 is a chassis side plate, 9 is a case, 1o is a paper feed switch, and 11 is a paper feed It's Laura. The operation of the conventional automatic paper feeder configured as described above will be explained. paper 2
After selecting , when the paper feed switch 10 is pressed, the paper feed circuit is activated and the solenoid 5 is energized.

As a result, the plunger 5& of the solenoid 5 is attracted in the direction of arrow B, one end of the bail lever 4 moves in the direction of arrow B via the link 6, and the other end moves in the direction of arrow C, causing the bail roller 3 to move away from the platen 1. Leave. Next, after the platen 1 rotates in the direction of the arrow and a separately provided sensor (not shown) locates the beginning of the paper 2, the solenoid 6 is de-energized and the bail roller 3 moves the paper 2 by the force of the spring 7. Return to the original position while holding it in place. However, such an automatic paper feeder requires an expensive solenoid and a solenoid drive circuit, resulting in a cost increase. or,
Because the solenoid moves quickly, there were problems such as impact noise and vibration. FIG. 6 shows a second conventional example of an automatic paper feeder. Here, 22 is a platen, 12 is paper, 1
3 is bail roller, 14 is pale lever, 15 ha!
Jyl, 16 is the arm, 17 is one microswitch (
18 is a return spring, 19 is a reversing spring, 2o is a bail lever shaft, 21 is a chassis side plate, 16a is an oblong hole provided in the link 16, 16a is a pin provided in the arm 16, 23 is a supply It's a paper roller. The operation of the second conventional automatic paper feeder configured as described above will be described.

When the bail lever 14 is rotated in the direction of the arrow E after all sections of the paper 12 have been filled, the bail row 213 is separated from the platen 22 and the link 15 is moved in the direction of the arrow F. After that, after the reversal spring 19 reverses beyond the dead center, the oval hole 151a
The rear end 16 &' collides with the pin 16 & of the arm 16,
- the movement of the bail-carrying lever 14 is stopped; At this point, the paper suction standby state is reached, but the bail lever 14
When moved in the direction of arrow E, the rear end 15 of the oblong hole 152L
&' further pushes pin 16&, and the tip of arm 16 strikes microswitch 17t-. As a result, the paper feed circuit operates, and the platen 22 rotates in the direction of arrow G, causing the paper 12 to
cueing is completed. After that, return the pail lever 14ft to its original position, and the bail roller 13 will hold down the paper 12.
The printer is in print standby mode.

However, this type of automatic paper feeder uses many arms, links, and springs, resulting in a complex structure and increased costs.The use of arms and links also occupies a large area, making it difficult to downsize the device. It is difficult and has the drawbacks of requiring time for inspection and adjustment.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional art, and provides a printing device having a simple structure, making the entire device compact, easy to maintain and inspect, and having an inexpensive automatic paper feeding device. It is intended to.

Structure of the Invention In order to achieve the above object, the printing device of the present invention rotatably supports a platen around which printing paper is wound and a bail roller, and includes a first position where the bail roller contacts the platen and a second position spaced apart from the platen. The bail lever is configured to be able to rotate between the second position and a third position further apart from the second position, and a part of the bail lever is engaged when the bail roller is in the second position. and a locking member for holding the platen in this state, and a detector that is operated by a part of the bail lever to bring the platen into a rotating state when the bail lever is in the third state. The automatic sheet feeder is equipped with a resilient member that urges the bail lever toward the platen, and the structure of the automatic paper feeder is simple and can be formed compactly. It is possible to reduce costs and facilitate maintenance and inspection.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a side view showing an automatic paper feeder of a printing device in an embodiment of the present invention. Here, 25 is the platen, 2
6 is paper, 27 is a paper feed roller, and 28 is a chassis side plate. The platen 25 can be rotated in the direction of arrow H by a motor (not shown). A bail lever 29 has a bail roller 30 attached to its tip, and is brought into contact with the platen 25 by the force of a spring 31. 32 is a support boss of the bail roller 29, 33 is an arm portion, and 33 & is a latch.

34 is a cam piece provided integrally with the chassis side plate 28;
41L is a notch that constitutes a locking member of the bail lever 29 together with the latch 33&. Reference numeral 35 denotes a detector, which is composed of a reed, a microswitch in this embodiment, and is fixed to the chassis side plate 28. 37 is a convex portion provided on the bail lever 29. 2 is a perspective view of the main part of FIG. 1, and FIG. 3 is a sectional view of the main part of FIG. 2.

In FIGS. 2 and 3, reference numeral 32a denotes seven flanges attached radially to one end of the support boss 32, two of which are symmetrically provided on the cylinder of the support boss 32.

36 is a support hole provided in the chassis side plate, and support boss 3
The diameter t- is slightly larger than the diameter of 2. The support hole 36 has one concave portion 362L having the same shape as the seven flange 322L.
Two pieces are provided 8o° symmetrically.

FIG. 4 is a view when the bail lever 29't in FIG. 1 is moved in the direction of the arrow. The operation of the automatic paper feeder of the printing apparatus of this embodiment configured as described above will be explained below. First, attach the bail lever 29 to the chassis side plate 28.
This is the procedure for installing the support boss 32 and support hole 3.
6 and 7 flange 32'& to the recess 36&, and insert the boss part into the hole.

After that, by twisting the bail lever 29, the installation is completed as shown in FIG. 3, and no fastening member is required and it will not come off. Furthermore, there is no need for processes such as machining the shaft for supporting the bail lever 29 and caulking for fixing the shaft. Next is the automatic paper feeding operation, but first the paper 26
Set it just before the feed roller 2a. Next, when the bail lever 29 is rotated in the direction of the arrow, the bail row 23
o leaves the platen 26, at the same time the latch 332L of the arm portion 33 slides on the cam piece 34, falls into the notch 342L, and engages a click stop. In this state, the machine enters paper feeding standby. After that, when the bail lever 29 is rotated in the direction of the arrow, the latch 33 & tries to move forward by getting over the notch 34 &, but the resistance to rotating the bail lever 29 increases and the next operation after the click stop begins. I can see that. On the other hand, the convex portion 37 of the bail lever 29 pushes the actuator of the microswitch 35, and the paper feed circuit (not shown) starts operating. In other words, the rotational force of the motor (not shown) is transmitted to the platen 26, and the platen 26
By rotating in the direction of arrow H, the paper 26 is fed and reaches the printing start position, and the rotation of the platen 26 is automatically stopped. If the bail lever 29 stops rotating in the direction of the arrow, the latch 33& will slide the cam piece 34 into the notch 34& and stop due to the biasing force of the spring 31. That is, the bail roller 30 stops in a state separated from the platen 25. Here, the stopping position of the paper 26,
After checking the inclination, etc., if there is no problem in starting printing, move the bail lever 29 in the direction of arrow J in the figure, so that the latch 33& is disengaged from the notch 342L and the bail roller 30 is in contact with the platen 26, i.e. The bail roller 30 stops pressing the paper 26t against the platen 26 and enters standby to start printing, completing a series of automatic paper feeding operations. By operating the bail lever 29 in this way, (i) the bail roller 30 is in contact with the platen 25, (11) the bail roller 3o is separated from the platen 25, (iii) the eye is It is possible to select from three states in which the dynamic sheet feeding circuit operates.

As described above, according to this embodiment, the number of components required to operate the automatic sheet feeding circuit can be reduced compared to the conventional one, and the automatic sheet feeding device can be made compact, resulting in a reduction in the size of the entire device. Moreover, since there is no need to use expensive parts such as solenoids, it is possible to provide a printing device with an automatic paper feeding device that can be manufactured at low cost and is easy to assemble, maintain, and inspect.

As described in detail, the printing device of the present invention rotatably supports a platen around which printing paper is wound, a bail roller, and has a first position where the bail roller contacts the platen, and a second position which is spaced apart from the platen. and a third position further apart from the second position, and a part of the bail lever is engaged when the bail roller is in the second position. and includes a locking member for maintaining this state, and a detector that is operated by a portion of the bail lever to rotate the platen in the third state, and a detector for rotating the platen in the third state. The automatic paper feeder is equipped with a resilient member that urges the platen side, and the automatic paper feeder can be constructed easily and compactly, making the entire device more compact, reducing costs, and facilitating maintenance and inspection. This is possible and has high practical value.

[Brief explanation of the drawing]

Fig. 1 is a side view of an automatic paper feeder in a printing device showing one embodiment of the present invention, Fig. 2 is a state diagram when the bail lever of the automatic paper feeder is assembled to the chassis side plate, and Fig. 3 is a side view of the automatic paper feeder in a printing device showing an embodiment of the present invention. 4 is a side sectional view of the fitting part between the same level lever and the chassis side plate, FIG. 4 is a side view showing the automatic paper feeder in the paper feeding operation standby state and printing start standby state, and FIG. 5 is the first conventional example. FIG. 6 is a side view of an automatic paper feeder showing a second conventional example. 25...Platen, 26...Paper, 2
7... Paper feed roller, 28... Chassis side plate, 29... Bail lever, 30...
・Bail roller, 31...Spring, 32・
...Support boss, 33...Arm part, 33&...
... Latch (locking member), 34 ... Cam piece, 34a ... Notch (locking member), 36 ...
...Micro switch (detector), 36...
・Support hole, 37...Protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] (1) A platen around which printing paper is wound, a bail roller rotatably supported, and a first position where the bail roller contacts the platen, a second position spaced apart from the platen, and a second position further spaced apart from the second position. The bail lever is configured to be rotatable to the third position, and includes a locking member that engages a portion of the bail lever when the bail roller is in the second position and maintains this state. and a detector that is operated by a portion of the bail lever to rotate the platen when in the third state, and a resilient member that biases the bail lever toward the platen. A printing device.