JPS5946795B2 - printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and more particularly to a serial printing device in which a type wheel is moved in the line direction and either the type wheel or a striking body facing the type wheel is driven to perform printing. Pertains to.

Generally, in this type of device, an electromagnetic plunger, etc.
At least four driving sources were required.

That is, the first is for causing the striking body and the type wheel to collide, the second is for moving the type wheel in the row direction one digit at a time, and the third is for returning the type wheel to the printing start position. and the fourth one is for feeding the recording paper by one line. Therefore, there are disadvantages in that the device becomes large in size and consumes a large amount of power. In addition, since the type wheel has a large number of numbers and symbols, its diameter becomes large, which increases the time required to select the numbers, etc. to be printed, and creates inertia in the type wheel, making it difficult to stop it at a predetermined position. was difficult. Thus, an object of the present invention is to provide a printing device that is compact and consumes less power by reducing the number of driving sources and simplifying the mechanism.

Another object of the present invention is to provide a printing device with an improved printing mechanism and a reduction in the diameter of the type wheel.

Furthermore, another object of the present invention is to provide a printing device suitable for attachment to a small desktop electronic computer or the like.

Still another object of the present invention is to provide a printing device that is easy to manufacture and inexpensive.

In order to achieve the above object, the present invention includes two small-diameter type wheels, only two electromagnetic plungers as driving sources, and uses the first electromagnetic plunger to perform printing and digits. The second electromagnetic plunger is used to return the type wheel, and the first and second electromagnetic plungers work together to feed the recording paper. Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, before explaining the details of this embodiment, its schematic structure will be explained according to FIG.
The periphery of the first type wheel 10 is mainly formed with numbers, and the second type wheel 11 is mainly formed with function symbols (for example, +, -, ×, #). , (fl), *, etc.) are formed.

These type wheels 10 and 11 are attached to a rotating shaft 12 having an oval cross-section, and are simultaneously rotated by a stepping motor (pulse motor) 18. The second type wheel 11 prints a function symbol only at a predetermined position on the recording paper (in this embodiment, the rightmost digit in the digit direction, that is, the last digit), while the first type wheel 10 moves on the rotary shaft 12 as the type holder 13 moves, and is moved along the digit direction one character at a time, and is configured as a so-called serial type printing mechanism. These type wheels 10 and 11 face a striking body 1 (hereinafter referred to as a hammer) via a recording paper 30, and this hammer 1 is driven by a first electromagnetic plunger 8 located behind the type wheels 10,
Hit 11. The first electromagnetic plunger 8 moves the hammer 1 through the recording paper to the type wheel 10 by its forward movement.
, 11, and the return operation causes the hammer 1 to collide with the hammer 1.
at the same time as the winding mechanism (drum) 16.
It is designed to rotate by an order of magnitude. This winding mechanism 1
6 and the type holder 13 are connected by a winding transmission member (hereinafter referred to as the connecting thread) 15, and the type holder 13 moves by the amount that the winding mechanism 16 rotates and winds up the connecting thread 15, and the first The type wheel 10 is moved toward the higher digit. 3
6 is a second electromagnetic plunger and the first type wheel 10
After printing for a predetermined number of digits is completed, the winding mechanism 16 is reversed to return the first type wheel 10 to the initial position, and the paper is fed in cooperation with the first electromagnetic plunger 8. It is for the purpose of

The general structure of this embodiment is as described above, and its operation is such that first, the stepping motor 18 rotates in response to a print command from the control circuit, rotates the type wheels 10 and 11 at the same time, and then rotates the second type wheel. 11 at a position corresponding to the desired function symbol.

Next, the first electromagnetic plunger 8 is driven, and its forward motion causes the hammer 1 to collide with the type wheels 10, 11.
Here, since a blocking plate 28 is interposed between the first type wheel 10 and the hammer 1 as a means for blocking printing, the second type wheel 11 is
Only the upper function symbol is printed in the first column of the recording paper. Next, the hammer 1 returns to its original position due to the return operation of the first electromagnetic plunger 8, and the take-up drum 16
rotates by one digit, and along with this movement, the type holder 13 moves by one digit via the connecting thread 15, moving the first type wheel 10 by one digit, and facing the blocking plate 28. remove from position. Here, the second type wheel 11 is always moved by the coil spring 21 when the first type wheel 10 moves by one digit in the above-described operation, and stops at a position facing the blocking plate 28. After that, the stepping motor 18 rotates again to select the number to be printed on the first type wheel 10, and after the first electromagnetic plunger 8 is driven and prints, the digit shift is started. It is done. Thereafter, when the first type wheel 10 prints sequentially up to a predetermined print digit in the same manner, the second electromagnetic plunger 36 is driven to reverse the winding drum 16 and move the type holder 13 (the first type wheel 10) is returned to the initial position (position facing the blocking plate 28), the first electromagnetic plunger 8 is operated again, the recording paper is fed by one line, and a new line is started, and a new printing line is printed. Be prepared. Although the general structure and operation of this embodiment are as described above, the details of the above structure will now be explained in detail with reference to FIG. 1.

FIG. 2 mainly shows the mechanism for driving the hammer 1.

As shown in Figure 2A, this mechanism consists of a slide lever 4 (printing operation, digit feed operation, return operation and a driving lever 5 whose one end is held by the pillar 3 and is rotatable around the pillar 3; and a hammer driving means 6 (hereinafter referred to as The first plunger 8 is assembled as shown in FIG. 2B. As shown in FIG. 2B, a raised protrusion 4a is formed at the left end corner of the slide lever 4.
a is engaged with the cam portion 6a of the drive cam 6.

Further, a protruding portion 4c is formed at the left end of the slide lever 4 via an arm portion 4b. This protruding portion 4c is not directly related to the driving of the hammer 1 and will be described in detail later. The other end (left end) of the drive lever 5 is slidably held by a guide groove 5a and a support post 7, and is rotatable in the front-rear direction using the support post 3 as a fulcrum. The drive cam 6 is configured such that its tongue portion 6b is always biased toward the first plunger 8 by a spring 9. The mechanism for driving the hammer thus assembled operates as follows.

That is, when the operating state is shown in FIG. 3, FIG. 3A is a state in which the first electromagnetic plunger 8 is not driven and corresponds to the top view of FIG. 2B. 1
When the electromagnetic plunger 8 is driven and its operating rod 8a moves forward, the state becomes as shown in FIG. 3B. That is, when the drive lever 5 rotates and deviates counterclockwise about the support 3 due to the advancement of the operating rod 8a of the first electromagnetic plunger 8, the drive cam 6 on the drive lever 5 also rotates together. but,
Since the cam portion 6a of the drive cam 6 is in contact with the cut-and-raised portion 4a of the slide lever 4, the tongue portion 6b protrudes toward the hammer 1, causing the hammer 1 to collide with a type wheel (not shown). Then, when the supply of current to the first electromagnetic plunger 8 is cut off, the operating rod 8a returns to the state shown in FIG. 3A. Next, details of the type wheel portion will be explained with reference to FIG.

As mentioned above, the type wheel in this embodiment is composed of two types, the first type wheel 10 mainly for printing numbers, and the second type wheel 11 mainly for printing function symbols. Double type wheel 1
0 and 11 are both attached to the rotating shaft 12, but the first
The type wheel 10 is also held in a type holder 13. This type holder 13 is inserted through a guide rod 14 extending parallel to the rotating shaft 12 and the hammer 1, and one end is connected to a winding drum 16 (see FIG. 1) by a connecting thread 15, and the other end is connected to a winding drum 16 (see FIG. 1). A spring means (hereinafter referred to as a tension spring) 17 biased in a direction opposite to the winding direction of the thread 15
is connected to. The first type wheel 10 is therefore moved toward the higher column (to the left in the figure) with each movement of the winding drum 16 (see FIG. 1). On the other hand, the second type wheel 11 is movable on the rotating shaft 12 by a predetermined amount of movement. These type wheels 10, 11 are face gears 1 fixed to the shaft of a stepping motor 18.
By meshing the gear 9 with the gear 20 provided on the rotation shaft 12, the rotation of the stepping motor 18 causes the rotation of the stepping motor 18.

Note that 21 is a coil spring, and 22 is a positioning gear provided on the rotating shaft 12, which is always engaged with the return prevention piece 23.

24 is a conductive part, which is connected to the two contact pieces 25, 25,
This is for detecting the rotation start position of both type wheels 10 and 11.

An ink roll holder 26 is made of an elastic material and includes a holding part 26a for holding the ink roll 27, and a mounting part 26b fitted into the groove 13a of the type holder 13.

The ink roll 27 is made of porous rubber, felt, etc., and is impregnated with a predetermined amount of ink, and the type wheels 10, 1 are moved by the elasticity of the ink roll holder 26 itself.
1 with light contact pressure. and,
This ink roll 27 commonly supplies ink to the type wheels 10 and 11, and when the type holder 13 is moving in the digit direction, it contacts only the first type wheel 10 and reaches the printing start position. In the case of both type wheels 10
, 11. Reference numeral 28 denotes a blocking plate which is always interposed between either of the type wheels 10, 11 and the hammer 1.

The type wheel section constructed in this manner operates as shown in FIG.

That is, FIG. 5A corresponds to the top view of FIG. 4, and shows the printing start position. In this state, the first type wheel 10 is in its completely returned starting position, that is, in a position where it is brought into contact with a stopper 29 on the rotary shaft 12 by the tension spring 17 and faces the blocking plate 28. On the other hand, the second type wheel 11 is pushed rightward in the drawing by the first type wheel 10 and is in a position where it does not face the blocking plate 28. In this case, the strength of the coil spring 21 biasing the second type wheel 11 to the left in the drawing is much stronger than the strength of the tension spring 17 pulling the first type wheel 10 back to the right. Of course it is weak. At this printing start position, the stepping motor 18 first rotates to rotate both type wheels 10, 11 to select a desired type.

In this case, since the first type wheel 10 faces the blocking plate 28, it is impossible to print even when hit by the hammer 1.
Therefore, the rotation of the stepping motor 18 at the beginning of printing is controlled so as to select the type on the second type wheel 11. Next, the first electromagnetic plunger 8 operates as described above (see FIG. 3), and its forward movement moves the hammer 1 through the recording paper 30 to the second type wheel 11.
The first digit on the recording paper 30 is printed. Then, by the return operation of the first electromagnetic plunger 8 (see Fig. 3), the hoisting drum 16 (see Fig. 1) is
The connecting thread 15 is wound up by the number of columns (details of this winding mechanism will be described below), the type holder 13 is moved, and the first type wheel 10 is moved to the state shown in FIG. 5B. As shown in FIG. 5B, when the first type wheel 10 moves by one digit, the first
The second type wheel 10 is removed from the position facing the blocking plate 28 and reaches a position directly facing the hammer 1 via the recording paper 30, while the second type wheel 11 is moved to the left in the drawing by the coil spring 21. It is moved and stops upon contacting the stopper 29, and faces the blocking plate 28.

Next, the stepping motor 18 is rotated again to rotate both type wheels 10, 11, but the selection of type by the stepping motor 18 is now performed for the first type wheel 10. Thereafter, the first electromagnetic plunger 8 reciprocates and the stepping motor 18 selects a type for each digit, completing printing up to a predetermined digit on the recording paper 30, and finally moves the type holder 13 to the starting position. The printing start state shown in FIG. 5A is returned to by a returning mechanism, which will be described later. FIG. 6 shows a mechanism for winding up the type holder 13 (first type wheel 10), and is a perspective view of the main parts of FIG. 1 viewed from the left side.

In the figure, reference numeral 16 denotes a winding drum pivotally supported on the chassis 31. The upper part of the winding drum 16 is provided with a part 16a for fixing the connecting thread 15, the body part is provided with ratchet teeth 16b, and the lower part is provided with a ratchet tooth 16b. A protrusion 16c is provided that comes into contact with a stopper (not shown) provided on the chassis 31 to prevent the winding drum 16 from over-rotating during reverse rotation (when the first type wheel 10 returns). Reference numeral 32 denotes a shift claw means (hereinafter referred to as shift lever) for engaging with the ratchet teeth 16b and rotating the winding drum 16. This shift lever 32 is connected to the tip of the drive lever 5 (second
(see figure), and the pawl 32a of the shift lever 32 is always held in the position of the ratchet tooth 1 by the spring 33.
6b.

34 is a holding means (
The rotational position of the winding drum 16 is maintained by a lever (hereinafter referred to as a return prevention lever), and this return prevention lever 34 is also supported by a spring 3.
5 so that the pawl 34a engages with the ratchet tooth 16b.

The winding mechanism constructed as described above operates as shown in FIG. That is, FIG. 7A shows the initial state in which the type holder 13 (see FIG. 1) is wound up, and the claws 32a and 34a of the shift lever 32 and the return prevention lever 34 are both connected to one ratchet tooth of the winding drum 16. The return prevention lever 34 is engaged with the winding drum 1.
6 is prevented from being reversed by the tension of the connecting thread 15 and the tension spring 17 (see FIG. 1). When the first electromagnetic plunger 8 moves forward from this state, the operating rod 8a
moves forward to rotate the 1st drive lever 5, and the shift lever 32 connected to this 1st drive lever 5 moves downward in the drawing. Therefore, as shown in FIG. 7B, the pawl 32a of the shift lever 32, which is always urged in the direction of the ratchet tooth 16b, passes over the initial ratchet tooth and comes into engagement with the next ratchet tooth. At this time, the anti-return lever 34 still engages with the original ratchet teeth to prevent the hoisting drum 16 from being reversed, and the above operation does not cause the hoisting drum 16 to rotate in the reverse direction. Then the first
The electromagnetic plunger 8 performs a return operation and the drive lever 5
As it returns, the shift lever 32 that is engaged with the next ratchet tooth also begins to return to its original position, and the winding drum 16
is rotated clockwise by one tooth to wind up the connecting thread 15 and move the type holder 13 (first type wheel 10) by one digit (see FIG. 1). At this time, return prevention lever 3
The pawl 34a of No. 4 rides over the ratchet tooth 16b rotated by the pawl 32a of the feed lever 32 and engages with the next ratchet tooth 16b, thereby preventing the winding drum 16 from being reversed. Then, the winding mechanism returns to the state shown in FIG. 7A again. It goes without saying that when the first electromagnetic plunger 8 moves forward, the hammer 1 is driven as shown in FIG. Next, referring to FIG. 8, a mechanism for returning the type holder 13 to the starting position and returning the wheels 10 and 11 to the printing starting position will be described.

This mechanism is composed of a second electromagnetic plunger 36 (see FIG. 1) and a slide lever 4 (see FIGS. 1 and 2). Now, when the winding drum 16 has finished winding up a predetermined number of digits and it is necessary to return the type holder, the second
The actuating plate 36a of the electromagnetic plunger 36 moves the slide lever 4 to the left in the drawing.

A protrusion 4c is formed at the left end of the slide lever 4 (see Fig. 2), and this protrusion 4c faces both the shift lever 32 and the return prevention lever 34 as shown in Fig. 6. ing. Therefore, when the slide lever 4 is moved by the second electromagnetic plunger 36, the protrusion 4c causes the levers 32, 34 to rotate against their respective springs 33, 35, as shown in FIG. and both levers 32,3
The pawls 32a and 34a of No. 4 are disengaged from the ratchet teeth 16b of the winding drum 16, and the locking of the winding drum 16 is released at once. Thus, the tension spring 17 (see FIG. 1)
The type holder 13, which had been pulled by the The paper is fed and preparations for new printing are completed. Finally, to explain the paper feeding mechanism, the recording paper 30 in this embodiment is as shown in FIG.
Placed in a roll behind the chassis 31, the chassis 31
An outlet hole 31a formed in the chassis 31 through the lower surface of the
The hammer 1 is conveyed from there to the front surface of the hammer 1 by the operation of a driving roller 37 and a driven roller 38.

The drive roller 37 is fixed to a support shaft 40 rotatably held by the frames 39, 39, and a driven roller 38, which is applied with an appropriate pressing force to the drive roller 37, is attached to the holder 4.
1 (made of an elastic material) and is in pressure contact. Note that the hammer 1 is supported by bearings 42, 42 inserted through the support shaft 40, so that it does not rotate due to the rotation of the support shaft 40 during paper feeding. A ratchet gear 43 is fixed to one end of the support shaft 40, and by rotating the ratchet gear 43 counterclockwise one tooth at a time, the recording paper 3
The paper is set to feed 0 one line at a time.

The rotation of the ratchet gear 43 one tooth at a time is controlled by the paper feeding claw means (
This is done using a paper feed lever 44 (hereinafter referred to as a paper feed lever 44). As shown in FIG. 6, this paper feed lever 44 is attached to the drive lever 5 coaxially with the shift lever 32, and is located below the shift lever 32. Then, a spring 45 provided between a groove 32b formed in the shift lever 32 and a groove 44b formed in the paper feed lever 44 itself keeps the pawl 44a of the paper feed lever 44 in the direction of the ratchet gear 43. Forced. Note that the shift lever 32 is provided with a stopper 32c, and the rotation of the paper feed lever 44 by the spring 45 is kept within a certain range. The paper feeding mechanism is constructed as described above and operates as follows.

In this embodiment, the paper feeding operation is performed after the following operations are completed.

That is, type selection by the stepping motor 18, drive of the hammer 1 and shift of the type wheel 10 by the first electromagnetic plunger 8, and second electromagnetic plunger 3.
This is after the return operation of the print wheel 10 to the starting position by step 6 is completed. Therefore, the paper feeding operation in this embodiment starts at the time when the second electromagnetic plunger 36 returns the printing wheel 10 (see FIG. 8). FIG. 10A shows the start point of the paper feeding operation. In this state, the slide lever 4 is moved leftward in the drawing by the second electromagnetic plunger 36, and the feed lever 32 is moved toward the winding drum. He has left since 16.

By rotating this shift lever 32, the spring 45
As a result, the paper feed lever 44 comes into contact with the paper feed ratchet gear 43, and when the first electromagnetic plunger 8 is driven in this state, the drive lever 5 is rotated by the forward movement and the paper feed lever 44 is brought into contact with the paper feed ratchet gear 43. 44 is moved downward in the drawing so that it passes over the original ratchet tooth and engages the next ratchet tooth, as shown in FIG. 10B. Then, the return operation of the first electromagnetic plunger 8 returns to the state shown in FIG. 10A, and the ratchet gear 43 rotates to complete feeding the paper for one line. By returning the actuating plate 36a of No. 36 to its original position, preparations for printing a new line are completed. Note that during paper feeding, since the cam portion 6a of the drive cam 6 and the cut-and-raised portion 4a of the slide lever 4 do not come into contact with each other, the rotation of the first drive lever 5 as shown in FIG. The hammer 1 is not driven like this. Conversely, when the type wheel 10 is moved, the paper feed lever 44 is prevented from rotating the paper feed ratchet gear 43, as shown in FIG. The above explanation has mainly been about the mechanism, but the operation of each part in this embodiment will not be particularly explained.
Needless to say, it is controlled at appropriate timing by a normal cape control circuit.

In this embodiment, two type wheels 10,
11, a blocking plate 28 is fixed between the hammer 1 and the second type wheel 1 in relation to the moving position of the first type wheel 10.
1 by moving each type wheel 10,11
are selectively opposed to and detached from the blocking plate 28 as appropriate (see FIG. 5), but the blocking plate 28 is made movable, and the movement of the blocking plate 28 is controlled by the first type wheel. It can also be configured in association with ten movement positions.

As described above, according to the present invention, only two electromagnetic plungers are used as the driving source, and the two electromagnetic plungers perform various functions such as printing, moving and returning the type wheel, and feeding the recording paper. Since all of these functions can be performed, the device can be made smaller and lighter, as well as being inexpensive and easy to manufacture.Additionally, power consumption can be reduced, making this printing device particularly suitable for use with small desktop electronic computers. It has the remarkable effect of being able to provide the following.

In addition, the first electromagnetic plunger, which has a relatively large force, performs printing (hammer action) and shifts the type wheel, and the second electromagnetic plunger, which has a relatively small force, operates when the type wheel returns.
Since the paper is fed when the first electromagnetic plunger is operated, the first electromagnetic plunger can perform the paper feeding operation which requires a relatively large force, and therefore, the first electromagnetic plunger is the one that acts as the driving source. One of the components can be made smaller and lighter, which greatly contributes to making the whole smaller and lighter.
It should be noted that the present invention is not limited to the configuration of the above embodiments, and it goes without saying that many design changes can be made without departing from the scope of the claims of the present invention.

[Brief explanation of the drawing]

Each of the drawings shows a printing device according to an embodiment of the present invention,
Figure 1 is an overall perspective view, Figure 2 is an explanatory diagram showing the configuration of the main parts of the mechanism that drives the hammer, Figure 3 is also an explanatory diagram of its operation, and Figure 4 is the main part showing the configuration of the type wheel section. FIG. 5 is a perspective view, and FIG. 5 is an explanatory diagram of its operation. FIG. 6 is a perspective view of main parts showing the configuration of a mechanism for winding up the type wheel.
The figure is an explanatory diagram of its operation, Figure 8 is an explanatory diagram of the mechanism for returning the type wheel, Figure 9 is a perspective view of the main parts of the paper feeding mechanism for recording paper, and Figure 10 is an explanatory diagram of its operation. . 1... Hammer, 4... Slide lever, 5... 1 drive lever, 6... Drive cam, 8... First Electromagnetic plunger, 10...
... first type wheel, 11... second type wheel, 13... type holder, 15...
...Wrap transmission body (connected body), 16...Hoisting drum, 17...Wrap transmission body (tension spring), 1
8...Stepping motor, 19...
Face gear, 21... Coil spring, 28...
...Breakout plate, 30...Recording paper, 32...
... Digit feed lever, 34... Return prevention lever, 36... Second electromagnetic plunger, 37...
... Drive roller, 43 ... Ratchet gear, 44 ... Paper feed lever.

Claims (1)

[Claims] 1. A hammer that performs a printing operation by moving the operating rod of a first electromagnetic plunger and has a striking surface that spans one line;
a winding drum which is driven by the movement of the operating rod in a direction opposite to the printing operation and which moves the type wheel in the row direction by an amount equivalent to one digit; a winding transmission body connected to the held type holder; a spring means for applying rotational force in a fixed direction to the type wheel winding drum in order to return the type wheel to a printing start position in the line direction; a drive lever connected to the actuating rod of the first electromagnetic plunger; a hammer drive means provided on the drive lever for driving the hammer; and a drive lever provided on the drive lever for driving the hammer; a shift claw means for rotating the winding drum by engaging with the ratchet teeth of the winding drum; a holding means for holding the winding drum in a rotational position against the spring means; and a paper feed. a rotatable support shaft to which a drive drum is attached, a ratchet gear fixed to the support shaft, and a ratchet gear provided on the drive lever and which cannot engage with the ratchet gear during printing operation and digit feeding operation. a second electromagnetic plunger that is smaller than the first electromagnetic plunger and operates based on a command to return the type wheel to the printing start position in the row direction; a switching means driven by a second electromagnetic plunger, and the switching means is driven by the operation of the second electromagnetic plunger, so that the hammer driving means cannot be rotated with respect to the driving lever. This prevents the hammer driving means from coming into contact with the hammer, and the ratchet teeth of the hoisting drum separate the shifting pawl means from the holding means, thereby preventing the hoisting drum from being held. releasing the winding drum by the spring means to return the type wheel to the printing start position in the line direction, and engaging the paper feeding means with the ratchet gear of the support shaft; A printing device characterized in that paper is fed on the drive lever by a subsequent operation of the first electrode plunger.