JPS60239263A - Serial printer - Google Patents

Abstract

PURPOSE:To eliminate a loss in power transmission and to put a mechanism in a unit so as to facilitate the assembly thereof by a construction wherein main mechanisms other than mechanisms for carriage transfer and paper feeding are arranged concentrically on a carriage. CONSTITUTION:A type wheel group 10, a hammer mechanism 16, a type wheel shifting mechanism 6 for switching over the positions of the hammer 16 and a type line of the type wheel 10, a hammer driving mechanism comprising a printing cam 15 etc. and switching mechanisms 13 and 14 for switching over a type selecting operation and a printing operation are arranged concentrically on a carriage plate 19 or a carriage body 18. According to this construction, a loss in power transmission between the mechanisms is eliminated, and in addition, the power transmission is made moderate, thus ensuring the operations of the mechanisms by a motor 1 of low power. Moreover, it becomes possible to put the mechanism in a unit, while assembly is facilitated. Furthermore, protection from dust is also enabled, since each mechanism other than the type wheel 10 is covered with a carriage.

Description

[Detailed description of the invention] Technical fields> TECHNICAL FIELD This invention relates to printers, particularly serial printers.

<Objective> An object of the present invention is to provide a serial printer that is easy to assemble and is inexpensive.

In order to achieve the above objective, the main mechanisms of a serial printer other than those related to carriage transport and paper feeding were mounted on the carriage, and the structure was designed to allow so-called sub-assembly. This makes it possible to provide a cover for security and dustproofing at an extremely low cost.

<Example> The drawings will be explained in detail below.

FIG. 1 is a plan view showing a schematic structure of an embodiment of the present invention, and FIG. 2 is a perspective view showing the main structure near a carriage. First, the structure near the carriage, which is a feature of the present application, will be explained. In FIGS. 1 and 2, the motor 1 is screwed to a carriage plate 19, which is a single metal plate, by a motor set screw 1-2, and the motor shaft 1-1 serves both as a gear train and a cam shaft.

The type wheel shaft 12 is inserted into the hole 19-1 of the carriage plate 19 during assembly.
However, in the assembled state described later, it is supported pivotally at two locations, including a hole 18-4 of the carriage body 18.

A claw shaft 58 of a lever, which will be described later, is caulked onto the carriage plate 19.

Further, the carriage plate 19 has a groove 1 that contacts the guide shaft 29 with no play in the vertical direction but with play in the front and back direction.
9-4 and screw holes 19-2 and 19-3. The carriage body 18 is integrally molded of plastic in the shape of a bag with a volume that can accommodate the gear train and levers, as shown by broken lines in FIG. The motor 1 and the gear train, and the motor 1 and the gear train, and the motor 1 and the gear train, and the carriage plate 19, which has a groove 18-5 for housing the boss part 16-2 and screw holes 18-3 and 18-4.
After assembling the hammer 16, the digit shift trigger 5 and the digit shift position detector 9 shown in FIG. .19-5 and 18-6 are screwed together to form an assembly around the carriage, which covers the gear train etc. with the carriage body 18. 19-5 is hammer 16
is a hole for penetrating the carriage plate 19.

An outline of the operation will be explained below.

The motor 1 drives the type wheel set 12 via two and three speed reduction means. 2 is the same as the selection drive gear 43 described later, and 3
is the selection gear. The type ring group 10 is restrained in the rotational direction with respect to the type wheel shaft 12, but is free to move in the axial direction (in the direction of arrow α), and is always urged in the axial direction by the type ring spring 11. 4 is a selection/print trigger mechanism; when the trigger magnet is energized, the normally rotating type wheel group 10 comes to a halt, and the normally stopped print switching mechanism A13 switches the power of the motor 1 from the type wheel axle 12; It starts rotating.

Furthermore, when the current of the trigger magnet is cut off, the printing switching mechanism B14, which is normally stopped, is driven by the printing switching mechanism A13 and starts rotating, driving the printing cam 15, and the hammer 16 is injected by an ink roll (not shown). Pushing out one type from the kinged type ring group 10 from the inside,
Printing is performed on the printing paper 27 on the platen 26.Details will be described later.

Reference numeral 5 denotes a digit shift trigger for the type wheel group 10. By the digit shift trigger 5, the digit shift switching mechanism 6, which is normally not engaged with the type wheel axle 12 and is stopped, engages with the type wheel axle 12 and rotates. is started, the digit shift cam 7 is driven, and the digit shift 7 oroku 8 is moved in the direction of the arrow α. The digit shift 7 oroku 8 does not rotate in the rotational direction but moves only in the direction of the arrow α, and because it is in contact with the type ring group 10, it moves the type ring group 10, which is biased by the type ring spring 11, in the direction of the arrow α. Then, the desired type is aligned with the tip 16-1 of the hammer 16. 9
17 is a digit shift position detector that detects the rotational position of the digit shift cam 70, that is, the position of the type ring group 10 in the direction of arrow α; 17 is a type exporter that detects the rotational position of the type ring group 10; is a carriage equipped with each mechanism from 1 to 17. By moving the carriage body 1B in the direction of the arrow β, printing is possible in the width direction of the printing paper 27.The movement of the carriage body 18 is controlled by the stepper motor 21. The forward and reverse rotations are transmitted to the wire 23 wrapped around the drum 22,
This is accomplished by coupling the wire 23 to the carriage body 18. Paper feeding of the printing paper 27 is achieved by rotating the stepper motor 21 via a paper feeding switching mechanism 24 and intermittently rotating a paper feeding roller 25. 20 is a frame. 3
o are F, P, and O that provide power and signals to various electrical components on the carriage body 18.Next, a perspective view showing the main part configuration of the deceleration and trigger means is shown in FIG. 4, and 2, 3.・Explain using Figure 4. FIG. 2 shows the structure of parts other than the levers near the carriage, FIG. 5 shows a part of FIG. 2 assembled, and FIG. 4 shows the positions of the levers.

Please note that in FIG. 2, identical parts and connected parts are shown separately for explanatory purposes.

To explain power transmission with reference to Fig. 2.5.4, the rotation of the motor shaft 1-1 in the direction of arrow A is as follows:
A motor gear 40 fixed to the tip of the motor is driven in the direction of arrow A. The motor gear 40 serves as a sun gear of a planetary gear mechanism that constitutes a differential mechanism, and the motor shaft 1-1 also serves as the shaft of each gear. The planetary gear mechanism includes a planetary gear 41 and a planetary gear 41
a selection drive gear 43 and an internal gear 42 having a shaft 43-1;
The selection drive gear 43 drives the selection gear 6, and the internal gear 42 is a 1y3 rotary clutch (45°46
．． 47, 48, 49, 50) through printing cam 1
Drive 5. In order to rotate the type ring group 10 in the direction of arrow B, if the ratchet 44 integrally formed with the internal gear 42 is prevented from rotating with the claw 55-1 of the selection claw 55, the planetary gear 41 will move in the direction of arrow B. Further, the selection drive gear 43 rotates in the direction of the arrow C via the shaft 43-1.The selection drive gear 5 is driven by the selection drive gear 43 and drives the type wheel shaft 12 in the direction of the arrow, and further the type wheel group 10 Rotate in the direction of the arrow. Next, the rotation of the ratchet 51, which is integrally molded with the rotating selection gear, is controlled by the claw 55-2 of the selection claw 55 (
When the ratchet 44 is simultaneously released and the ratchet 44 is released, the rotation of the motor gear 4o drives the internal gear 42 in the direction of the arrow E.

The trigger mechanism consists of a trigger plate 52, a trigger coil 53, and a trigger yoke 54. When the trigger coil 53 is energized, the trigger yoke 5 rotates in the same manner as the type wheel spindle 12.
4, the trigger plate 52 is attracted in the direction of the arrow F, and the rotation of the trigger yoke 54 causes the trigger plate 52 to rotate in the direction of the arrow F.

The trigger plate 52 has a selection pawl 55 and an actuation lever 56 shown in FIG.
is driven in the direction of arrow G. Here, the axial positions of ratchets and levers will be explained with reference to FIGS. 3 and 4.

The pawl 55-1 is connected to the ratchet 44 and the 1y3 rotating clutch (4
There are three control discs 46 (consisting of 5, 46, 4y, 48, 49, 50) (ratchet) 46-1, 46-2.
, 46-3, and the tip 56-1 of the operating lever 56 engages with the ratchet 46-1 of one of the ratchets 46-3.
6, the second ratchet 46-2 is engaged with the second ratchet 46-2. Selection claw 5
The other claw 55-3 of 5 is the main part 49 of the 1y3 rotating clutch.
The reference numeral 059 that engages with the return cam 50 integrally formed with the cam 50 is a bistable spring for ensuring the operation of the selection pawl 55. Furthermore, in FIG. 2, the same parts shown separately are the motor shaft 1-1, the motor gear 4o, and the type wheel shaft 12, and those connected by integral molding are the selection drive gear 4.
3, the shaft 43-1 of the planetary gear 41, the internal gear 42, the ratchet 44, and the ratchet 4 used for the 1y3 rotating clutch.
5. The main part 49 of the 115-rotation clutch, the return cam 5o, the printing cam 15, the selection gear 3, and the ratchet 51.0 Next, the operation of the main parts will be explained using FIG.

jI 5 (A) shows a state in which the selection ratchet 51 is rotating, that is, a selection standby state, in which ratchet 44 and ratchet) 4 (S-1 are restrained by pawl 55-1 of selection pawl 55, and pawl 55-2 047, which is not in contact with the selection ratchet 51, is a clutch pawl, which is pivotally supported by the shaft 49-1 of the reflatch main part 49 and is biased in the direction of the arrow by the clutch spring 48. The control disc 46 is loosely inserted into the hole 46-4 of the plate 46 and the clutch main part 4
9 (see Fig. 2). In Fig. 5 (B), the selection pawl 55 and the operating lever 56 are rotated in the direction of the arrow (Fig. 4) by rotating the trigger plate 52 in the direction of the arrow (Fig. 4). G
Shows the state rotated in the direction. Selection ratchet 51 is pawl 5
5-2, the ratchet 44 and the control disc 46
motor 1 because the connection with pawl 55-1 has been released.
The ratchet 44 begins to rotate in the direction of the arrow X due to the force of the clutch spring 48. In this state, the ratchet 44 begins to rotate continuously, but the ratchet 46-2 maintains an angle J even if it is disengaged from the pawl 55-1. When the second ratchet 46-2 is rotated, the tip 56-1 of the actuating lever 56 restrains the second ratchet 46-2, and the rotation is temporarily stopped. At this time, only the control disk 46 moves by the angle J, and the clutch main section 49 is positioned by the printing cam 15 and the hammer 16, which also serves as a detent, and does not rotate (FIG. 2).

Since the outer periphery 46-5 of the control disk 46 is formed to be slightly larger than the outer periphery of the ratchet 44, the pawl 55-1 does not hinder the rotation of the ratchet 44.

Moreover, the teeth 47-1 of the clutch pawl 47 do not come into contact with the clutch ratchet 45 even if the control disc 46 rotates only by the angle J. If the trigger coil 53 (Fig. 2) continues to be energized, this state will continue, but if the current is cut off, the 5th (0)
It will be in the state shown in the figure. In FIG. 5(0), since the current of the trigger coil 53 is cut off, the actuating lever 56 is moved to the actuating lever spring 57.
Returns in the direction of arrow H. At this time, the selection claw 55 does not return in the direction of arrow H due to the outer periphery 46-5 of the control disc 46. The tip 56-1 of the operating lever 56 is ratcheted) 46-2
When disengaged from the clutch spring 48, the control disc 46
The force shown in FIG. 2 causes it to rotate by an angle X in the direction of arrow A. At this time, the clutch pawl 47 also rotates, and the teeth 47-1 of the clutch pawl 47 enter the locus of the clutch ratchet 45. ) is arrow E
Rotate in the direction. That is, the printing cam 15 also rotates and drives the hammer 16. As the rotation progresses further and the printing process is completed, the return cam 50 moves to the selection claw 55 as shown in FIG. 5(D).
, and rotates the selection claw 55 in the direction of arrow H. Furthermore, as shown in the fifth figure, before the selection pawl 55 rotates in the direction of arrow H and the pawl 55-2 disengages from the selection ratchet 51, the pawl 55-1 engages the ratchet of the control disk 46. ) 46-2 and restrains the control disc 46. The clutch main part 49 is in the detent process due to the printing cam 15, hammer 16, and hammer spring 60 (Fig. 2) that have completed the printing process, and is biased in the direction of arrow E by the hammer spring 60. After returning the relative positions of the clutch main part 49 and the control disc 46, which have deviated by the angle shown in Fig. 5(C), to the initial state and disengaging the clutch pawl 47 and the clutch ratchet, Fig. 5(A) Return to the state of 〇<Effect> As is clear from the above explanation, according to the serial printer of the present invention, the carriage plate or carriage body includes a type ring, a selection mechanism for selecting type on the type ring, a hammer mechanism, A type wheel shift mechanism that switches the position of the handle X and the type string of the type wheel, a hammer drive mechanism, and a switching mechanism that switches between type selection operation and printing operation are centrally arranged. Most of the mechanisms are centrally located on the carriage, so there is no interference in power transmission between each mechanism, and there is no need to force transmission of power, so power can be transmitted reliably between each mechanism with low power. Furthermore, since most of the mechanisms necessary for the printer are centrally arranged in the carriage, it is possible to form a unit and the assembly becomes very effective.

In addition, since each of the above-mentioned mechanisms except the type wheel is covered by the carriage, it is possible to take measures against dust, so that problems caused by dust-proofing can be solved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a schematic configuration of the present invention, FIGS. 2 to 4 are perspective views of the main parts, and FIG. 5 is a side view showing the operation of the main parts. 1...Motor 1o...Type wheel group 15...Printing cam 16...No1ma 1B...Carriage body 19... ... Carriage plate 21 ... Stepper motor 30 ... FPa 44 ... Internal gear ratchet F 45 ... Clutch ratchet 46 ... Control disc 47...Clutch pawl 48...Clutch spring 50...Return cam 55...Selection pawl 56...Operating lever

Claims (1)

[Claims] 1) A type ring having a plurality of type rows on one side holding a carriage plate and a hammer having one end positioned inside the type ring, and a hammer on the other side for shifting the type ring in the digit direction. a shift mechanism for switching the position of the type string on the type wheel and the hammer, a selection mechanism for selecting the type on the type wheel, and a shift mechanism/selection mechanism that is stopped during operation; When stopped, a printing switching mechanism is installed to operate the hammer driving member to drive the hammer and enable printing, and the printing paper is integrally transported along the printing paper by a carriage body guided by a guide shaft. 2) The carriage body is coupled to the carriage plate so as to cover the shift mechanism, the selection mechanism, the hammer drive member, and the print switching mechanism. serial printer 0