JPS5933120B2 - small printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small printer that stores spring energy in a printing member and performs printing by releasing this spring energy.

A conventional small printer will be explained using FIGS. 1 and 2.

1 is a type wheel having a plurality of type letters 101 arranged on its outer periphery; 2
3 is a type wheel having one end attached to the type wheel 1 and the other end engaging the groove of the type wheel axle 2 to interlock the type wheel 1 as the type wheel axle 2 rotates. Spring,
4 is a selection pawl that engages with the selection teeth 102 provided on the type ring 1 to select a predetermined type; 5 is a selection spring that rotates the selection pawl 4 in the direction of arrow P; and 6 is rotation of the selection pawl 4 in the direction of arrow P. T is an electromagnet for attracting the suction plate 6,
8 is a hammer that performs printing by striking the selected type 101 through the printing paper 11; 10 indicates the hammer 8 in the direction of arrow s;
The spring 9 that rotates in the direction is a cam that drives the armature 8 in the direction of the arrow against the force of the spring 10.

A small printer with such a configuration can be divided into selection, printing, and reset processes, and the selection process will be explained first. First, when the type wheel shaft 2 rotates in the direction of arrow n, the type wheel 1 also rotates due to the action of the type ring spring 3. 101 typefaces you want to print
When it reaches the printing position 12, the electromagnet T is energized to attract the suction plate 6 in the direction of the arrow U. Then, the selection pawl 4 is disengaged from the suction plate 6, and the selection pawl 4 is rotated in the direction of arrow P by the selection spring 5, and its tip jumps into the selection tooth 102 provided on the type wheel 1 to stop the type wheel 1. The type wheel shaft 2 continues to rotate thereafter, and one end of the type wheel spring 3 comes off the groove of the type wheel shaft 2 and slides on the outer periphery. When such an operation is performed for all digits, the selection process is completed. Next is the printing process. The cam 9 rotates in the direction of the arrow and drives the hammer 8 in the direction of the arrow. Then, the spring 10 stores spring energy and pulls the hammer 10 in the direction of arrow S. When the cam 9 rotates further and the maximum outer diameter portion 901 engages with the cam 8, the cam 8 has moved to the maximum extent in the direction of the arrow, so even if the cam 9 continues to rotate, the maximum outside diameter portion 901 The contact portion with the hammer 8 only generates friction, and no spring energy is stored in the hammer 8. When the cam 9 further rotates and the notch 902 comes to a position facing the hammer 8, the engagement between the cam 9 and the hammer 8 is momentarily disengaged, and the hammer 8 is moved to the arrow S by the energy stored in the spring 10.
The printed characters 101 rotated in the direction are struck through the printing paper 11. In this way, characters are printed on the printing paper 11. Yes, during this operation, the operation of storing energy in the hammer 8 by the cam 9 and before releasing it can be performed during the previous selection process. Next, the setting process will be explained. When the selection pawl 4 is rotated in the direction of arrow q by the reset cam 13, it is disengaged from the selection teeth 102 of the type wheel 1. Also, the suction plate 6 returns to its original state, that is, the state in which the selection claw 4 is locked. The type wheel shaft 2 rotates in the direction of arrow 0, and the type ring spring 3 fits into the groove of the type wheel shaft 2, and the positional relationship between the type wheel 1 and the type wheel shaft 2 returns to the original state, and this operation is completed for all digits, and the type is printed. The setting process ends when the wheel set 2 returns to its original position. Of course, the printing paper 11 is also fed during this resetting process. In such a structure, the torque required for the cam 9 to rotate in the direction of the arrow t is mostly due to the force of storing energy in the spring 10 and the loss due to the slippery friction between the cam 9 and the hammer 8. The torque required to rotate the cam 9 is shown in FIG. 2. The horizontal axis represents time, and the vertical axis represents the torque required by the cam 9. From A to B, the cam 9 drives the hammer 8, pulls the spring 10, and stores spring energy, and from C to D. is the torque due to frictional force, that is, friction loss, between the maximum outer diameter part 901 of the cam 9 and the cam 8, and between A and B, it is accumulated as printing energy and is effective, but C The period from to D is wasted work that does not become printing energy. D
The point is when the notch 902 of the cam 9 and the hammer 8 are opposed to each other and the two are disengaged. In this way, compared to the energy required for printing, the energy lost due to friction is large, and a large amount of energy is required with poor efficiency.
An object of the present invention is to provide a printer that operates reliably and requires less energy by mechanically controlling a hammer member connected to a spring member to a standby position and a non-standby position.

The present invention will be explained below using FIGS. 3 and 4.

22 is a type wheel shaft having a groove on the outer periphery; 21 is a type wheel shaft 2;
2, a plurality of type wheels are supported on a shaft and have type characters 211 on the outer periphery;
Reference numeral 23 denotes a claw member provided on the type wheel 21 with spring properties so as to engage with the groove of the type wheel shaft 22, and 24 a trigger for engaging and disengaging the claw member 23 and the groove of the type wheel shaft 22. 25 is an electromagnet for selectively driving the trigger lever 24; 26 is a hammer supported on a shaft 36 that faces the type wheel 21 through printing paper 31 and performs printing; 27 is a lever;
・A spring that rotates the hammer 26 in the direction of arrow a, 28 a hammer drive member that engages with the protrusion 261 of the hammer 26 and drives the hammer 26 in the direction of arrow b, and 29 a spring that locks the hammer 26. The locking member 30 is a hammer lock release member that releases the lock between the hammer locking member 29 and the hammer 26.

An apparatus having such a configuration can be divided into selection, printing, and resetting processes, and the selection process will be explained first.

First, the type wheel shaft 22 begins to rotate in the direction of arrow f. At this time, even though the type wheel shaft 22 rotates, the type wheel 21 does not rotate.
This is because the claw member 23 provided on the type ring 21 is locked by the trigger lever 24, and the positioning member 32 is engaged with a spring force in the protrusion 212 provided on the side wall of the type ring 21. 21 is rotated in the direction of arrow c, and as a result, the claw member 23 rotates in the direction of arrow d centering on 231, and stops when it hits the pin 213 provided on the type ring 21. Claw portion 232 and type wheel shaft 22
The type ring 21 does not rotate because it does not engage with the groove. In order to align the type to be printed at the printing position, when the groove of the type wheel shaft 22 corresponding to the type to be printed comes to a position facing the claw part 232 of the claw member 23, the electromagnet 2
5 is energized. Then, the suction plate 33 moves in the direction of the arrow e and disengages from the trigger lever 24.
moves in the direction of arrow g under the action of the spring 34 and disengages from the pawl member 23. Since the pawl member 23 is constantly trying to rotate in the direction of the arrow h due to the springy part 233, when it is disengaged from the trigger lever 24, it rotates in the direction of the arrow h, engages with the groove of the type wheel shaft 22, and rotates. Start. Claw member 23
is provided on the type wheel 21, so when the claw member 23 rotates, the type wheel 21 starts to rotate together with the type wheel shaft 22, and the type wheel 21 rotates. When the type wheel shaft 23 rotates approximately once by performing the same operation for each digit, the type characters to be printed are already aligned in a straight line for each digit and are brought to the printing position. The above is the selection process. Next, in the printing process, when the hammer driving member 28 rotates around the shaft 35 in the direction of the arrow 1, it begins to push the protrusion 261 provided on the hammer 26, and the hammer 26 stores spring energy in the spring 2r. Rotate in the direction of arrow b.

This continues until the maximum outer diameter portion 281 of the hammer drive member 28 and the protrusion 261 of the hammer 26 are engaged. When this state is reached, the hammer 26 moves to a position where the end 262 of the protruding part of the hammer 26 can be hooked on the hook 291 of the hammer locking member 29, and the hammer locking member 29 is moved by the spring force (
(not shown) rotates in the direction of arrow j...
to lock. When the hammer driving member 28 further rotates, the defective portion 282 provided in the hammer driving member 28 and the hammer 26
The protrusions 261 of the two face each other, and the engagement between the lever 26 and the lever driving member 28 is disengaged. In this case, the hammer 26 is rotated in the direction of arrow a by the spring energy stored in the spring 27, but since it is locked by the hammer locking member 29, the hammer 26 continues to store the spring energy. This is to maintain the state of The conventional operation is to store the energy necessary for printing before printing, and it is quite possible to carry out this operation during the selection process. In order to print,
- The hammer locking release member 30 rotates in the direction of arrow m at a predetermined timing and engages with the hammer locking member 29. The hammer locking member 29 is rotated in the direction of arrow k to lock with the hammer 26. I'll figure it out. Then, the hammer 26 is rotated by the spring 27 in the direction of the arrow a, and the selected characters are struck and printed on the printing paper 31. The above is the printing process. Next, the setting process will be explained. Trigger during selection process
The lever 24, which had been rotated in the g direction, is returned to the direction of the arrow 1 by a method not shown and is locked again by the suction plate 33. When the type wheel shaft 22 rotates once in this state, the pawl member 23 provided on the type wheel 21 of each digit moves to the trigger lever 2.
Collision with 4. Then, the pawl member 23 rotates in the direction of arrow f until it disengages from the groove of the type wheel shaft 22, and finally the positioning member 32 rotates the type wheel 21 in the direction of arrow c.
As a result, the claw member 23 rotates in the direction of arrow d, and the type ring 21
The type wheel 21 is stabilized at this position and the setting of the type wheel 21 is completed. of course,
The printing paper 31 is also fed during this resetting process. This completes one printing cycle, but when the hammer 26 stores the energy necessary for printing, the torque required by the hammer driving member 28 becomes as shown in FIG. The horizontal axis represents time, and the vertical axis represents the torque required for the hammer drive member 28. Between A and B...the hammer drive member 28 is the hammer 2
6 is being driven and spring energy is being stored in the spring 27, and from C to D, the hammer 26 is disengaged from the hammer driving member 28, and the hammer 26 is being locked by the hammer locking member 29. As shown in this figure, almost no energy is required during this period, and it is possible to avoid the friction loss that occurs in conventional devices to maintain the normal state. Further, the energy required for the hammer lock release member 30 to release the lock of the hammer 26 during printing may be small. In this mechanism, if the timing of energizing the electromagnet 25 during the selection process is set between C and D in Figure 4, the energy required for printing and the energy required for selection will not be required at the same time. , the peak current of the entire small printer can be lowered, and the power supply can be made smaller. As described above, according to the present invention,
The hammer member connected to the spring member is held in a standby position while storing the spring force of the spring member, and when printing, the holding is released and the hammer member is given flight force, so all the controls are mechanical. Therefore, the hammer member can be controlled reliably and the effect of requiring less energy can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional small printer, in which 1 is a type wheel, 2 is a type wheel shaft, 3 is a type ring spring, 4 is a selection claw, 7 is an electromagnet, 8 is a..., 9 is a cam, 11 is printed paper.

Claims (1)

[Claims] 1. A plurality of type wheels having printed characters such as letters, symbols, etc. on the outer periphery arranged in plurality, a selection means for selecting and stopping the type characters of the type wheels at a predetermined position, and a printing device facing the type type wheels via a printing medium. a spring member that applies a flight force to the hammer member; a hammer driving member that resists the spring member and drives the hammer member to a predetermined position; and a hammer that locks the hammer member at a predetermined position. a locking member; and a hammer lock release member that engages with the hammer locking member to release the lock from the hammer member; A small-sized printer characterized in that release of the hammer member that has been engaged is controlled by cams provided on the hammer drive member and the hammer lock release member, respectively.