JPS58151282A - Rocking mechanism for printing head - Google Patents

Abstract

PURPOSE:To provide the titled mechanism capable of preventing a printing head from vibrating, by a method wherein a cam for rocking a printer frame is rotated through a spring, and is brought into contact with a rubber on a bracket at the top dead center thereof. CONSTITUTION:As the bottom dead center of the cam 32 approaches to a cam follower 8a, the cam follower 8a is moved in the direction of an arrow E by the spring 22, and the printing head 21 approaches to a platen 10. At the top dead center of the cam 32, the cam 32 is brough into contact with the rubber 8c on the bracket 8b fixed to the printer frame 8, thereby absorbing vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technique of the Invention The present invention relates to a printer device such as a bookkeeping machine having an inserter journal printer. Regarding improvements.

(b) Technology background Recently, various devices have been developed as banking terminals.

Among the most widely used are financial institution counter-recording machines that can print bankbooks and record journals.

The printer of this bookkeeping machine is designed to be able to print on media of different thicknesses, such as passbooks and journal paper, but it is necessary to ensure print quality in both cases.

Taking a wire tod printer used in a printer unit as an example, a conventional method will be explained with reference to FIGS. 1 to 4. Fig. 1 is a perspective view illustrating a bookkeeping machine to which the present invention is applied, Fig. 2 is a sectional view schematically showing the inside of Fig. 1, and Fig. 3 wJ
2 is a plan view showing an overview of the printer section in FIG. 2, and stripe 4 is a 4R view showing the swinging mechanism in FIG. 3. In the figure, 1 is the main body of the device, 211-t disk, 21 is the I control section, and 3 is the main body of the device.
Board part, 4 is passbook insertion slot, 4& is pathway, 4b,
14 is a feeder 90-ra, 5 is a printer section, 6 is a paper transport section,
7a is a paper feeding section, 7b is a winding section, 8 is a printer frame,
8a is a cam slider, 9 is a side frame, 10 is a platen, 11 is a bankbook, 12 is a journal paper, 13 is a carrier, 15 is a kitesha, y), 16 is a feed screw (%17 is a bell), 19fl motor, 20 is an ink ribbon cassette , 20a is an ink ribbon, 21 is a printing head, 22 is a spring, 23 is a shaft, 241 is a Yucam, 25 is a support shaft, 26 is a semicircular gear, 27 is a motor shaft, 28 is a gear,
As shown in Figs. 1 and 2, the counter 29 is constructed by mounting the device main body l on top of the data register 2 which has a built-in control unit 2&. A pass-insertion opening 4 is provided, and the passbook 11 is held straight against the operation surface. Further, a company display 35 is arranged on the right side of the bankbook insertion slot 4, and the operation escapes and bets are displayed one by one. Now, to explain the case of deposit withdrawal as an example, in this case the passbook 11 is a deposit passbook. First, the operator inserts passbook #s11 into passbook insertion slot 4.
When the paper is inserted into the busway 4a, it is sent to the printer section 5 by the feed roller 4b, etc. of the busway 4a. Next, the customer's desired seat is selected and a predetermined print is made on the running mill.Meanwhile, the transaction details are recorded in a predetermined print on the journal paper 12 supplied from the paper feed section 7a, and the transaction is recorded on the winding section 7bK roll. taken. The passbook 11 after the printing process is returned to the passbook insertion slot 4 by reverse rotation of the rollers 4a and the like. To explain the printer unit 5 of such a bookkeeping machine, FIG. #I3 shows a wire tod printer as an example], and this printer is mounted on an inserter journal printer unit. First, a platen 10 is rotatably supported by a side frame of the unit. When printing on the bankbook 11 mentioned above, the right half of the platen 10 is used, and when printing on the journal paper 12, the left half is used. Accordingly, a journal paper 12 of a predetermined width is wound around the left half of the platen 10, and the print paper 11 is sent in the direction of arrow A in the figure by the feeding roller 214 or the like. On the other hand, on the front side of the platen 10, that is, in the lower part of the figure, a carrier 13 is slidably fitted into a guide shaft 7) 11S provided parallel to the platen 10, and the carrier 13 is connected to the platen 10 as shown in (b). The guide shaft 15 is disposed in parallel and is threadedly engaged with the advance screw 16, and the guide shaft 15 is supported by the printer frame 8. The feed screw 16 is a bell) 1
7, etc., and is connected to the motor 19 and sent according to p1>
The screw 16 is screwed into the carrier 1 by the forward and reverse rotation of the motor 19.
31 in the directions of arrows C and D in the figure.

Carrier 13 is equipped with incremental cassette 20 @i5
P1 cassette) 20 has an endless ink ribbon 20
m is built in with a part of it exposed on the platen l0IIK 1, ma9, middle yaria 13 to Mori printing V de 21
The ink ribbon force 4 y ) 20 ) is installed in such a manner that the print head 21 is provided with several horizontal printing magnets for forming printing by dots.

Further, as shown in Figure 11g4, the printer 7 frame 8 is rotatably supported at the rear, at the lower right end in the figure, by a support shaft #l attached to the tid frame 9. One end of a spring 22 is attached to the front of the printer frame 8, at the upper left end in the figure, and the other end is attached to a side frame IOK, so that the printer frame 8 is lifted upward. In addition, a cam 70a 8a is formed at the front of the printer frame 8, at the lower left end in the figure, and a shaft 23 supported by the side frame 9.
The printer frame 8 rotates in the direction of arrows E and F in the figure, using the support shaft 25 as a rotational fulcrum, against the elasticity of the spring 22 due to the rotation of the cam 24 by a mechanism to be described later. The eccentricity aSS of the cam 24 is then excited. Then, when the top dead center of the cam 24 comes to the bottom, the printer 7 tray 58 comes to the lowest position. That is, the retraction of the print head 21 in the direction of arrow H in the figure becomes maximum. Also, when the bottom dead center of the cam 24C approaches the lower position and the printer frame 8 approaches the moth-height position, a stopper (not shown) stops the printer frame 8 from rising, and the printer frame 8 approaches the platen 10 in the direction of arrow G in the diagram. The print head 21 is set so that it stops when the gap with the platen 1° becomes an appropriate distance for printing on the journal paper 12.

When printing on Masashi passbook 11, Vdo 21 is printed on passbook 1.
In order to set back by a thickness of 1 and have a gap with the paper surface, a pressure bar not shown in the figure is attached to the printer frame 8 and is attached to the printer frame 8 over the entire width of 11 to maintain the printing position. It is designed to press the bottom of the

In addition, a semicircular gear 26 is attached to one end of the shaft 23 and meshes with gears 28 attached to two shafts of the motor (not shown in the figure on page 1). The cam 24 of the shaft 23 is rotated forward and backward at an angle within a 260 tooth profile range (approximately 1800 degrees).

A leaf spring 29 is provided on the printer frame 8 so as to contact the side surface of the semicircular gear 26 and perform a braking action.

With this configuration, when performing journal printing, the print head 21 is placed to the left of the platen 10 shown in FIG.
When the print head 21 is activated after moving the print head 21 close to the platen 1o surface, the print wire of the print magnet collides with the journal paper 12tC and the ink ribbon 20m on the platen 10 surface, causing the printing to become unpleasant. The head 21 prints on the journal &12 while moving with the carrier 13 in the direction of the arrow. When printing for one machine is completed, the journal paper 12 is transferred in the direction of arrow A by a predetermined tension amount at the ninth line feed. and print head 21
continues printing while moving in the direction of arrow C. When printing is completed, the first character print head 21 is retracted from the platen 10 surface.

When printing on the passbook 11, the pad 21 is moved to the printing position on the inserted passbook 11, and then brought close to the platen 10 surface, and printing is performed in the same manner as described above.

To explain in detail how the print head 21 approaches and retreats from the platen 10, first, the V-shaped 21
4, when the gear 29 rotates in the direction of the arrow J due to the drive of the motor, the semicircular gear 27 rotates in the direction of the arrow, and the coaxial cam 24 rotates in the same direction to rotate the printer frame. The contact with the 80 cam 7txa8& moves from the top dead center to the bottom dead center, and the spring 22 rotates the printer frame 8 about the support 425 in the direction of arrow E in the figure, and the tip of the print head 21 Platen 1
approaches 0. And the semicircular gear 260 point a is the leaf spring 29
), the rotation of the semicircular gear 26 is braked. When printing on the bankbook 11, the above-mentioned pressure bar hits the paper surface and stops at the pressed position depending on the thickness of the printing position on the bankbook 11. In other words, the bottom 21 of the printing area is the platen 1G.
The printer moves back by the thickness of the paper and then stops at a position with a predetermined gap to perform the printing operation.

Furthermore, when printing on the journal paper 11, the rotation of the printer frame 8 is stopped by the stopper as described above, and the printing operation is performed at this position. Also, when the print head 21 is retracted from the platen 10 surface, the gear 27 is reversed by the reverse drive of the motor, the semicircular gear 26 is rotated in the opposite direction, and the cam 24 is moved to the printer frame 80 cam 707.
Push the part 8m downward in the figure, rotate the printer frame B around the support shaft 25 in the direction of the arrow F in the figure, and move the rad 21 towards printing.
will leave the office from platen 10. In this way, the print head 21 approaches and retreats from the platen 10 surface. However, according to this method, when the print head 21 approaches the platen 10 surface and stops, the printer frame 8 and the stopper The tip of the p1 print head 210 vibrates back and forth due to the reaction caused by the collision between the pressure bar and the passbook 11 and the vibration of the spring 22. , the distance between the tip of the print head 21 and the platen 10 during printing is determined by the stroke of the print wire of the print head 21 and the i of the medium.
Different values are set depending on @, but in the case of journal printing, the distance is 0.75 @/peng, and in the case of bankbook printing, the distance between the tip of the print head 21 and the paper surface is, for example, [0,
75 dust/-@degree The allowable size is *0.05m1m in any case, and this limit may be exceeded due to vibration. For this reason, there is a drawback in that the printed dots are poor, which adversely affects the printing quality.

(d) Object of the Invention The object of the present invention is to solve the above-mentioned drawbacks, and to provide a swing mechanism that can prevent vibration of the print head.

The present invention includes a platen member, a printing section including a print head,
A drive unit that moves the printing unit in parallel to the platen member, a frame that supports the printing unit and the drive unit, and a cam that is in contact with the frame O cam floor and the armpit cam floor are rotated, and the cam that is in contact with the frame and a swinging mechanism for moving the printing section and one driving section toward and away from the platen member), and a swinging mechanism for moving the printing section and the first drive section toward and away from the platen member, and a swinging mechanism for moving the printing section and the first drive section toward and away from the platen member, and to media of different thickness set in the gap between the printing section and the platen member. In a printer that performs printing, the swinging mechanism is configured such that a pusher is fitted and fixed, and a cam is rotatably attached to the shaft at a distance from the pusher, and the cam is rotatably attached to the shaft at a distance from the pusher and the cam. Wrapping a spring around the shaft, fixing both ends of the spring to the end faces of the pusher and the cam,
A mechanism is provided for causing the frame to swing by the rotation of the cam by bringing the cam into contact with the cam floor of the frame and rotating the shaft, and also for exciting the rotation of the cam at a predetermined position. This is a print head swinging mechanism characterized by comprising a braking member that causes the print head to move. In this way, the objective can be achieved.

(f) Embodiment of the Invention An embodiment of the present invention will be described below with reference to FIGS. 5 to 7. 5 is a side view showing an embodiment according to the present invention, 6wJ is a front view showing the swinging mechanism drive section of FIG. 5, and FIG. 7 is a side view of FIG. 6. In the figure, 8b is a bracket, 8
e is rubber, 30 is a shirt), 31 is a push stick, 32 is a cam, 33 is a spring 134 is an E-ring. The same parts as in Figures 2 to 4 of Trench 9 are indicated by the same symbols.

As shown in FIG. 5, a bracket 8a having a flat end portion lined with rubber 8c is provided on the printer frame 8 so as to be located above the cam 32 of one shaft 30. Further, as shown in FIG. 6, the shaft 30 is supported by the side claim 9, and the shaft 30 has a pusher
1 is fixed, and the cam 32 is rotatable at a distance from the pusher & 31. A spring 33 is wound around the shaft 3ρ, and both ends thereof are fixed to the ends of the pusher &31 and the cam 32. The shaft 30 is rotatably driven by a heptad (not shown). An E ring U is attached to the shaft 30 on the other end surface of the cam 32 to prevent the cam 32 from moving in the axial direction. Also, cam 3
2 is in contact with the cam floor 8aK of the printer frame 8 as shown in FIG.

With such a configuration, when the print head 21 is brought close to the platen IOK, the printhead is driven and rotated in the direction of the arrow as shown in FIG.
Due to the contact pressure of the cam 32Fi in contact with the cam floor 8aK, the spring 330 resists the elasticity in the rotational direction and rotates in the direction of the arrow M in the figure later than the rotation of the shaft 30. As shown in FIG. 5, as the bottom dead center of the cam 32 approaches the cam floor 8a, the cam floor 8a causes the bullet 21 of the spring 22 to approach the platen IOK. At this time, when the top dead center of the cam 32 reaches the upper position and comes into contact with the rubber of the platen 8b downward, the rotation of the cam 32 is braked by the elasticity and frictional force of the rubber 8c, resisting the elasticity of the spring 330. The rotation of the shaft 3o is further delayed (for example, by 4004 degrees). Therefore, the rotational speed of the cam 32 is gradually increased, and when the shaft stops, the cam 32 is moved between the printer frame 8 and the stopper or fi@1llt by the elasticity of the rubber 8σ and the 111It day force of the spring 33. As shown by the two-dot chain line in the figure, the printer is in a state where the cam 32 is in contact with both the cam floor 8a and the lower surface of the platen 8b. Hold frame 8. Set this to 5 and go to print V
It is possible to prevent the platen 10 from collapsing when the board 21 approaches the platen 10 and performs the printing process.

Also, when the print head 21 is moved away from the platen 1o surface, the motor is reversely rotated and the shaft 30 is reversely rotated.
The cam 32 pushes the bracket 8b and the floor 8ak downward by the rotating force of the shirt 30 and the restoring force of the spring 33,
Since the printer frame 8 is rotated around the support @25 in the direction of arrow F in the figure, the print head 21t can be retracted.

In the above embodiment, a plaque ν) 8b lined with rubber 8c downward is provided to brake the cam 32, but it goes without saying that other methods may also be used. For example, the diameter tPfi of the pusher 31 is made large, a # of a predetermined depth is provided at a predetermined position on the outer periphery with a slope M in a half line about the axis, a detent panel is attached to the printer frame 8, and the detent spring is It is also effective to use the shaft 30 so that contact pressure is applied to the outer periphery of the pushing tip. If you apply this in combination with the method of the 9th embodiment, you will get @shuyorai.

(g) Detailed description of the invention! As described above, according to the present invention, the cam that swings the printer frame is rotated via a spring, and the vibration is absorbed by making the cam contact the rubber of the placket fixed to the printer frame at the top dead center of the cam. Therefore, it is possible to prevent the print head from vibrating when it approaches the platen to perform printing, and therefore, there is an effect that the print quality is not impaired.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a bookkeeping machine to which the present invention is applied;
Figure 2 is a one-dimensional view showing the internal structure of Figure 1, Figure 3 is a plan view showing an outline of the printer section in Figure 2, and Figure 4 is a side view of the rocking mechanism in Figure 3. , FIG. 5 is a 1Ill direction view showing an embodiment of the present invention, FIG. 6 is a front view showing the swinging mechanism drive section of FIG. 5, and FIG. 7 is a side view of No. 6WJ. In the figure, 8 is the printer frame, 8m#i force A70
A, 8b is a placket, 8c is a rubber, 9 is a side frame, 1O is a platen, 11 is a passbook, 12 is a journal paper, 21 is a print head, 22゜33 is a spring, 23
．． 30 is the shaft, 24°32 is the cam, 25 is the support shaft,
26 is a semicircular gear, 27 is a motor shaft, 28 is a gear, 29 is a leaf spring, and 31 is a pusher. Figure 1 % 3 Figure 4 Figure 1

Claims (1)

[Claims] a platen member, a printing unit including a print head, and a drive unit that moves the printing unit in parallel to the platen/1@S material;
The frame that supports the wrinkle printing part and the chain drive S rotates the cam floor of the skeleton frame and the cam in contact with the cam floor,
a swinging mechanism that swings around a support shaft that supports the skeleton frame to cause the V-printed part and the driving part to approach and retreat from the platen member, and is set in the gap between the printing part and the platen member. In a printer that prints on media of different thicknesses, the swing mechanism has a cam rotatably attached to a shaft to which a pusher is fitted and fixed, with a cam spaced apart from the pusher. A spring is wound around the shaft of the cam at the interval, and both ends of the spring are fixed to the pusher and the end surface of the cam, and the cam is brought into contact with the force member of the frame O to close the shut. The apparatus is characterized by comprising a mechanism for swinging the frame by the rotation of the cam and a braking member for braking the rotation of the cam at a predetermined position. )1) @ moving mechanism.