JPS592629B2 - printing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and more specifically to a fly fern type printing device that performs printing by striking a hammer body on a continuously rotating type drum. The purpose is to prevent unnecessary vibration of the actuator for transmitting the rotational energy of the ratchet wheels that rotate continuously in synchronization.

Another object of the present invention is to provide a printing device that can be manufactured at low cost by simplifying the shaft support structure of the actuator. The details of the present invention will be explained below with reference to an embodiment of the present invention shown in FIGS. 1 to 5.

In the figure, reference numeral 1 denotes a continuously rotating type drum driven by a motor, and on its outer periphery, printed characters 1a, such as numbers and function symbols, are formed over a plurality of digits.

2 is a ratchet wheel that continuously rotates in synchronization with the type drum 1, and when the type drum 1 rotates for one character, the ratchet wheel 2 rotates 1.
/2 rotations, and extends over the entire length of the type drum 1 in the digit direction.

2a, 2a are the pawls of the ratchet wheel.

Reference numeral 3 denotes a hammer body whose one end is pivotally supported, which is arranged every several digits of the type drum 1, and every several rotations of the type drum 1, the hammer bodies 3 every several digits are transferred by an amount equivalent to one digit. It's becoming like that.

(The shifting mechanism of the three groups of hammer bodies in the digit direction will not be described in detail, but if necessary, please refer to the applicant's earlier application No. 1983-101148 (Japanese Utility Model Application No. 54-29715). ) 4 is the stopper, 5 is the hammer body 3
This is a spring that constantly presses the stopper in four directions. Is 6 an electromagnet? ... is fixed, 8 is an actuator that is pivotally supported at one end, 9 is a stopper frame that restricts the amount of rotation of the actuator 8, 10 is a stopper frame that guides the middle part of the actuator 8, and moves the actuator 8 in a certain direction. 13 is a holder that rotatably holds one end of the actuator 8; 14 is installed between the holder 13 and the support frame 6; It is a buffer member made of a material such as rubber, and each member 6, 7, 8, 9, 10, 13, 14 mentioned above is integrated by a subassembly before being incorporated into the printer main body. This is hereinafter referred to as actuator block A for convenience.

2 to 4 are drawings showing the above-mentioned actuator block A, and for convenience of explanation, the vertical relationship is reversed from that in FIG. 1.

Figures 2-4! At C11, a support frame 6 made of a metal plate
consists of a bottom plate 15, a rear plate 16, and side plates 17, 17, and five electromagnets 7 are fixed to the bottom plate 15 by suitable means such as tightening. Also, position the holder 13 of the actuator 8, which will be described later, on the rear plate 16!
A notch 18 is formed for the purpose of opening. The actuator 8 includes an armature 19 made of a magnetic metal plate, a hammer drive section 20 for transmitting the rotational force of the ratchet wheel 2 to the hammer body 3, and a connecting body 21 that connects both 19 and 20. , are arranged in the same number as the electromagnets 7. 2
Reference numeral 2 denotes a metal support shaft fixed to one end of the armature by means such as spot welding, and is connected to a groove 25 of the holder 13, which will be described later.
It seems to be pushed deep inside.

Reference numeral 19a denotes a narrow portion of the armature 19, which is positioned in a guide groove 31 of a guide body 10, which will be described later.

Further, a synthetic resin connecting body 21 integrally molded with the contactor 19 has two arms 21a, 21a formed thereon.
The hammer driving section 20 is connected to the shaft 2 between the two arms 21a, 21a.
3, it is rotatably held. The hammer drive unit 20 is composed of a synthetic resin base 20a and a metal drive plate 20b partially embedded in the base 20a.
When the drive plate 20b enters into the rotation locus of the ratchet wheel 2, the hammer driving section 20 transfers the rotational force of the ratchet wheel 2 to the hammer body 3. It is designed to communicate. The holding body 13 made of synthetic resin has diagonal grooves 25 on both wing parts 24, 24.
, 25 are formed respectively, and these grooves 25, 25
Push the support shaft 22 of the actuator 8 into the innermost part of the
The actuator 8 is rotatably held by a holding body 13.

26 is a through hole bored in the center of the holding body 13, and 21 is a mounting screw for fastening the holding body 13 to the support frame 6.

14 is a flat buffer member made of a material such as rubber, and has a hole 14a in the center for inserting a mounting screw 27 therethrough.

This buffer member 14 is attached to the support frame 6 along with the holder 13.
The rear plate 16i1C is attached to function as a damper that absorbs vibrations of the actuator 8 (at the support point).
The width S between the notches 18 and the width S of the protruding walls 29 formed in the rear plate 16 (see FIG. 2) are the same width, If the holding body 13 is inserted into the projecting wall 29 so as to sandwich the projecting wall 29 between the wings 24 and 24, and the lower portions of both wing parts 24 and 24 are brought into contact with the bottom of the notch 18, the holding body 13 will be , is automatically positioned at a predetermined position on the rear plate 16, so that the armature 19 of the actuator 8 faces the electromagnet 7 at an appropriate distance.

If the mounting screw 27 is tightened in this state, the support shaft 22 of the actuator 8 will be moved to the projecting wall 29 as shown in the first figure.
is pressed against the innermost part of the kerf 25 of the holder 13 by the end face of the holder 13, and is securely positioned and held while only rotating freely. Here, numerals 30, . . . are screw holes for screwing together the mounting screws 27, which are bored in the rear plate 16. Reference numeral 10 denotes a guide body made of synthetic resin, and in FIG. The width is the same as that of the narrow part 19a of the armature 19, and by inserting this narrow part 19a into the guide groove 31, the actuator 8 can rotate stably without lateral wobbling. ing.

Further, a vertical hole 32 is formed at the bottom of each guide groove 31, and the spring 11 inserted into each vertical hole 3211C is inserted into the vertical hole 3211C.
In addition, the actuator 8 is constantly biased with a rotational force in the counterclockwise direction in FIG. 1 by the pusher 12. The guide body 10 has its lower end surface connected to the support frame body 6 in FIG.
The support frame 6 is attached by screws inserted through the holes 33 in the bottom plate 15 of the
Notches 34 and 34 formed on the side end faces are fixed to the
Screws 35 for mounting the stopper frame 9, which will be described later.
It is structured so that it can be fixed even on the side by biting into it. Reference numeral 9 denotes a stopper frame body made of a metal plate, which includes first and second regulating plates 37, which communicate the side plates 36, 36 with both side plates 36, 36;
38, the first and second regulating plates 37, 38
A long window 39 is formed between them.

Then, the stopper frame 9 is attached to the support frame 6ifC with the hammer driving portions 20 of each actuator 8 protruding from this long window 39, and each actuator 8 is always set to the first regulation by the spring 11. It is adapted to be pressed against a plate 37. Further, when the electromagnet 7 is excited and the armature 19 is attracted to the electromagnet 7, the actuator 8 rotates around the aforementioned pivot point until the hammer drive section 20 comes into contact with the second regulating plate 38. , rotation beyond the intended amount of rotation is restricted. The side plate 36 of the stopper frame has elongated holes 40, 4 for inserting the screw 35.
0 is bored, and the guide body 10 and the stopper frame 9
(For convenience of illustration, the screw receiving plate 41 and the screw 35 are only shown on one side in FIG. 2, but they are provided on both sides.) The hole 42 of the side plate 17 of the support frame 6 is inserted into the screw hole 41a of the support frame 6.
By the screw 35 inserted and screwed into the elongated hole 40,
Both frames 6 and 9 are designed to be integrated, but since the side plate 36 of the stopper frame 9 is provided with a lengthening 40, the stopper frame 9 is not attached to the support frame 6. As shown in FIG. 4, after moving the stopper frame 9 up and down to position the stopper frame 9 at a desired mounting position, the screws 35...・The stopper frame body 9 is fixed by tightening. Therefore, when the actuator block A is assembled into the printer body, the mounting position of the block A, that is, the positional relationship between the hammer body 3, the ratchet wheel 2, and the block A is usually constant, so that the above-mentioned The fact that the attachment position of the stop collar frame 9 to the support frame 6 can be varied and adjusted as shown in FIG. This makes it easy to adjust printing timing, etc. Also, since the above adjustment adjusts all actuators 8 at the same time, printing can be done for each actuator 8 separately. There is no variation in quality. Note that 43, 43 are bent pieces extending from the side plate 36 of the stopper frame 9, and screws are screwed into the screw holes 44, 44 drilled in the bent pieces 43, 43. Then, the actuator block A is attached to a predetermined position on the printer body.
In FIG. 4, only one part of the actuator 8 is shown and the others are omitted, but five actuators 8, the same number as the electromagnets 7, are arranged on the actuator block A, and each actuator 8 is The hammer driving portions 20 of the actuators 8 correspond to the aforementioned hammer bodies 3 and cover a movement area of several digits of each hammer body 3 (for example, a movement area of 3 digits of the hammer body 3), Each hammer body 3 can be driven.

(As mentioned above, please refer to Utility Application No. 101148/1984 if necessary for this configuration.) Although it is generally clear from the above explanation, the operation of this embodiment will be explained based on FIG. 1.Printing The type drum 1 and the ratchet wheel 2 are continuously rotated by the command, and the electromagnet 7 of a predetermined digit is excited in synchronization with the rotational position of the type drum 1 based on the input data.When the electromagnet 7 is energized, the spring 11, the first regulation plate 3
Actuator 8 force that was pressed against 7 side ~ Spring 11
The actuator 8 is attracted by the magnetic core 7a of the electromagnet 7 against this force, and the actuator 8 rotates in the direction of the arrow X in FIG. Hammer drive unit 20 impacted by pawl 2a of ratchet wheel 2
rotates about the shaft 23 in the direction of arrow Y in the figure. As the hammer drive unit 20 rotates, the hammer body 3 rotates at high speed toward the type drum 1, and the hammer head 3a is rotated through the paper 45.
is applied to a desired position on the type drum 1 coated with ink, and the desired type is printed on the paper 45. After printing, the hammer body 3 returns to the position where it contacts the stopper 4 & C by the spring 5i1C, and along with this, the hammer drive unit 20 also returns to its original position, and the actuator 8
As a result of the electromagnet 7 being de-energized, the spring 1
1, it returns to the position where it contacts the first regulation plate 371C.

At this time, since the actuator 8 is provided with the buffer member 14 at its axial fulcrum (fulcrum part) as described above, unnecessary vibrations when the actuator 8 returns can be suppressed as much as possible.

As a result of absorbing vibration at the fulcrum of the actuator 8, the vibration of the entire actuator 8 is suppressed as much as possible.Actually, using the actuator block A of this embodiment, the When we measure the change in the amount of displacement of the protrusion of the tip of the actuator 8, we find that in the case where there is no buffer member 14 as shown in FIG.
While vibration (repound) occurs at 30 to 50% of the amount of suction movement, when the buffer member 14 is provided, this unnecessary vibration (repound) is suppressed to about 10% or less of the amount of suction movement. Therefore, there is no possibility that the hammer drive section 20 will re-enter the rotation locus of the ratchet wheel 2 due to unnecessary vibration (repound), and so-called '4 double strike'5 is completely prevented.
As described above, according to the present invention, the holder 13 that rotatably holds one end of the actuator 8 is attached to the support frame 611C via the buffer member 14, such as rubber, so that the actuator 8 can be used as the actuator when returning. Not only can the vibration of the actuator 8 be significantly reduced and the so-called "double printing" can be prevented, but also the actuator 8, that is, this type of In a flying printer, unnecessary vibrations are effective in suppressing repulsion of parts that should not occur most, and its reliability is high.

In addition, not only can the dimensions of the actuator block A1, the hammer body 3, and the ratchet wheel 2 be managed as easily as possible, but the amount of suction movement by the electromagnet 7 of the actuator 8 can be made relatively small, and the size of the electromagnet 7 can be reduced. , speeding up is also possible. Furthermore, since the structure does not include an electromagnet and prevents the vibration of the actuator, the amount of shock absorbing member used can be reduced, making it economical.

Note that the material, shape, etc. of the buffer member may be modified in various ways without departing from the spirit of the present invention; for example, in addition to rubber, sponge, elastic cloth, etc. may be used; It goes without saying that this falls within the scope of this claim.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention, and FIG. 1 is a partially simplified sectional view of essential parts, FIG. 2 is a partially simplified exploded perspective view of the actuator block, and FIG. 3 is a partially simplified exploded perspective view of the actuator block. A partially simplified perspective view showing the actuator block in an assembled state; FIG. 4 is a partially cutaway front view of the actuator block; FIG. 5 A shows the actuator with and without a buffer member; It is a graph showing the comparison of vibrations. 1... type drum, 2... ratchet wheel, 3.
...Hammer body, 6...Support frame body, 7...
... Electromagnet, 8 ... Actuator, 9.
... Stopper frame body, 10 ... Guide body, 1
1... Spring, 13... Holding body, 14...
...Buffer member, 20...Hammer drive section,
22... Support shaft, 37... First regulation plate, 38... Second regulation plate, 41... Screw receiving plate.

Claims (1)

[Claims] 1. A hammer body that strikes the type drum, a ratchet wheel that continuously rotates in synchronization with the type drum, an actuator that is pivotally supported at one end that transmits the rotation of the ratchet wheel to the hammer body, and an electromagnet that selectively drives the actuator. The hammer drive part of the actuator, which is equipped with a buffer member that absorbs vibrations caused by the rotational movement of the actuator, is driven by an electromagnet and enters into the rotation locus of the ratchet wheel, thereby transferring the rotational force of the ratchet wheel to the hammer drive part. In a printing device configured to absorb vibrations of an actuator while transmitting the vibrations to a hammer body via an electromagnet, a holder that pivotally supports the actuator is attached to a support frame provided with the electromagnet via the buffer member, A printing device characterized by absorbing vibrations when the actuator returns.