JPS62145112A - Synchronizing signal detecting device for printer - Google Patents

Abstract

PURPOSE:To improve the adjustment accuracy, and to cope with a high speed operation of a printer by fixing integrally an electrode disk as one body to a type wheel, and executing a fine adjustment of synchronization by moving linearly a slide contact point set. CONSTITUTION:By fixing integrally an electrode disk 2 as one body to a type wheel shaft 1, a phase shift of the electrode disk 2 and the type wheel shaft 1 does not occur by inertia of the electrode disk 2, even if a printer is operated at a high speed, and also, it will suffice that an interference of the electrode disk 2 and the type wheel shaft 1 is not too tight, therefore, no crack is generated in the electrode disk 2. Also, by executing a fine adjustment of synchronization by moving linearly a slide contact point set 3, the adjustment can easily be executed, and the accuracy for adjustment is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting a synchronization signal corresponding to a type arrangement in a small type printer.

[Prior Art] Conventional devices of this type were as shown in FIGS. 4 and 5. That is, there is a gap between the flat part 1a of the type wheel shaft 1 and the flat part 2c of the hole in the electrode disc 2, and the electrode disc 2 is rotated in the direction of rotation (direction of arrows A and A) with respect to the type wheel shaft 1.
The circumferential portion lb of the type wheel shaft 1 and the circumferential portion 2d of the hole in the electrode disc 2 are press-fitted with an appropriate margin. Further, the sliding contact set 3 is fixed to the frame 4. Fine adjustment of the synchronization between the signal from the sliding contact 3a and the type arrangement is carried out by stopping the type wheel shaft 1 at a predetermined position and rotating the electrode disk 2 by the necessary amount in the direction of arrow A. Ta.

[Problem that the invention attempts to solve] Problems with the conventional technology are as follows.

First, because the circumferential portion 2d of the hole in the electrode disc 2 is crushed or otherwise deformed by press-fitting, it is difficult to make fine adjustments, and the adjustment accuracy is also poor. Further, since the type wheel shaft 1 rotates intermittently, when the rotation speed increases, a phase shift occurs between the electrode disk 2 and the type wheel shaft 1 due to the inertia of the electrode disk 2. If the tightness between the type wheel spindle l and the electrode disc 2 is made tighter in order to eliminate this problem, fine adjustment becomes more difficult and the electrode disc 2 is more likely to crack. In addition, in this type of printer, as will be mentioned in the detailed description of the present invention, no signal should be output from the sliding contact 3b while the type wheel set 1 is stopped, but the precision of the fine adjustment itself and the electrode pattern 2a If the dividing accuracy is poor, the positional relationship between the sliding contact 3b and the electrode pattern 2a may deviate more than necessary after fine adjustment. There was also the drawback that a signal could be emitted.

This is also more likely to occur because as the rotational speed of the type wheel set 1 increases, the vibration of the type wheel set 1 also increases when the type wheel set 1 stops.

The present invention has been made to solve these problems, and its purpose is to provide a periodic signal detection device that can cope with high-speed printer operation, is highly reliable, and is easy to adjust.

[Means for solving the problem] The electrode disk 2 is integrally fixed to the type wheel shaft 1, and fine adjustment of synchronization is performed by linearly moving the sliding contact set 3. The extension line of the movement locus of the contact point 3b was made to pass near the center of rotation of the type wheel shaft l.

[Function] By integrally fixing the electrode disk 2 to the type wheel shaft 1, even if the printer operates at high speed, the phase shift between the electrode disk 2 and the type wheel shaft 1 will not occur due to the inertia of the electrode disk 2. Moreover, since the tightness between the electrode disc 2 and the type wheel shaft 1 does not have to be too tight, cracks do not occur in the electrode disc 2. Further, by performing fine synchronization adjustment by linearly moving the sliding contact set 3, adjustment becomes easier and the accuracy of adjustment is improved. Furthermore, by making the extension line of the movement locus of the sliding contact 3b pass near the center of rotation of the type wheel shaft 1, the positional relationship between the sliding contact 3b and the electrode pattern 2a does not shift due to fine adjustment of the cycle. Because there are
No signal is output from the sliding contact 3b while the type wheel set 1 is stopped.

[Examples] Examples of the present invention will be described in detail below. FIGS. 1 and 2 show an embodiment of the present invention, in which symbol (2) is a type wheel shaft, into which a type wheel (not shown) having type letters arranged around its outer periphery is integrally fitted in the rotating direction. Reference numeral 2 denotes an electrode disk which is formed of an electrode pattern 2a corresponding to the arrangement of letters on the type wheel and an insulating synthetic resin 2b embedding the pattern, and which is fixed to the type wheel shaft 1 and rotates integrally with the type wheel shaft 1. 3 is a sliding contact set consisting of four sliding contacts 3a to 3d and a pedestal 3e for fixing them. 4 is a frame, and 5 is a mounting screw for fixing the base 3e to the frame 4. The signal waveform obtained by this device is as shown in FIG. 3 when the type wheel shaft 1 rotates once at a constant speed. The signal e is the signal a detected by the sliding contact 3a.
This is a synchronization signal for printer control formed by an external circuit from the signal detected by the sliding contact 3b.The synchronization signal e rises at the rise of signal a, and falls at the rise of signal 6. . Further, the signal d detected by the sliding contact 3d is a signal indicating a reference position in order to establish correspondence between the synchronizing signal e and printed characters.

Next, in order to operate this, the motor is first started, and the type wheel set 1 begins to rotate in the direction of arrow A via a wheel train system (not shown). Since the electrode disk 2 fixed to the type wheel shaft 1 also starts rotating in the direction of arrow A at the same time, signals a, b, and d as shown in FIG. 2 are generated from the sliding contacts a, b, and d, respectively. Note that the sliding contact C is a common contact. As described above, the synchronizing signal e is formed from the signals a and b. signal d
By counting the subsequent synchronizing signals θ in sequence starting from the synchronizing signal e when detected, it is possible to know the timing to stop the desired type at the printing position.

When the desired type has rotated to the printing position, the type wheel spindle 1 is locked by a type wheel spindle locking mechanism located in a part not shown and printing is performed, but this type wheel spindle 1 is stopped. The synchronizing signal e must not be counted during this period. because,
This is because the fact that the synchronization signal e is counted while the type wheel set 1 is stopped means that the correspondence between the type and the synchronization signal e is deviated. By the way, due to variations in the locking position of the type wheel shaft 1, variations in the contact position of the sliding contact 3a, etc., it is necessary to fine-tune the synchronization between the signal a and the type arrangement when assembling the printer. In this embodiment and the conventional example, the type wheel shaft l is selectively locked at a predetermined printing position of the type, and at this time the sliding contact 3
Finely adjust a to the vicinity where signal a falls (the position shown in Figure 1). For this reason, when the type wheel set 1 is stopped, the signal a will repeatedly rise and fall due to the vibration of the type wheel set 1, so in this state, the synchronization signal e will not be counted, so the signal a will not be output. It becomes necessary. In other words, when the type wheel set 1 is in a stopped state, the sliding contact 3
There must be sufficient space between the electrode pattern 2a and the electrode pattern 2a before and after it. In this case, if the positional relationship between the sliding contact 3b and the electrode pattern is also shifted due to the fine adjustment of the signal a and the type arrangement as in the conventional example, the accuracy of the fine adjustment itself and the fine adjustment may be affected. If the positional accuracy between the pattern and other patterns is poor, the sliding contact 3
If the positional relationship between the electrode pattern 2a and the electrode pattern 2a is shifted more than necessary, there is a possibility that a signal will be generated while the type wheel spindle 1 is stopped.However, in the present invention, the sliding contact cellar 1.3
Fine adjustment is made by moving linearly in the direction of arrow A, and the positional relationship between the sliding contact 3b and the electrode pattern 2a is not extremely biased even after the fine adjustment fs:'J
Since the JJ contact 3b is arranged, there is no need to worry about the signal being emitted while the type wheel set l is stopped. In addition, after fine adjustment, the pedestal 3e of the sliding contact set 3 is screwed to the frame with the mounting screw 5, so the load resistance force when shifting the sliding contact set 3 in the direction of arrow A is important for operability. This improves the operability and precision of fine-tuning synchronization.

[Effects of the Invention] As explained above, according to the present invention, even if the type wheel set 1 rotates intermittently at high speed, no phase shift occurs between the type wheel set 1 and the electrode disk 2, so that the timing force of the synchronization signal is reduced. ! Moreover, since the output of the signal due to the vibration of the type wheel set 1 while the type wheel set 1 is stopped can be prevented, the count of the synchronizing signal will not go out of order. In addition, since the operability of fine synchronization adjustment is improved, the adjustment accuracy is improved, it is possible to support higher-speed operation, and the assembly cost I can be reduced by shortening the adjustment time. In other words, according to the present invention, it is possible to provide a synchronization signal detection device that is highly reliable and easy to adjust, and is extremely effective in increasing the speed, reliability, and cost of printers. It is.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the device of the present invention, in which (a) is a front view, (b), (c) i, and 1 (a) are side views. FIG. 2 shows a sectional view of FIG. 1(a), and FIG. 3 shows a signal diagram detected by the apparatus shown in FIGS. 1 and 2. FIG. 4 shows an example of the prior art, in which (a) is a front view;
(b) and (c) are side views of (a). FIG. 5 shows a sectional view of ¥S4 (a). 1... Type wheel spindle 2... Electrode disc 3... Sliding contact set 4... Frame 5... Mounting screw or more

Claims (1)

[Claims] an electrode disk having an electrode pattern corresponding to a type arrangement of a type wheel rotating integrally with the type wheel spindle and installed at an end of the type wheel spindle so as to rotate integrally with the type wheel spindle; a sliding contact member that makes sliding contact and detects at least two systems of contact signals having different phases corresponding to the electrode pattern, and a circuit provided externally detects the first of the at least two systems of contact signals. When the first contact signal rises, a synchronizing signal for controlling the printer corresponding to the type arrangement of the type wheel rises, and when the second contact signal rises, the synchronizing signal falls. In a synchronization signal detection device for a printer configured to form a synchronization signal, fine adjustment of synchronization between the type arrangement of the type wheel and the first contact signal is performed by linearly moving the sliding contact member, and A synchronization signal detection device for a printer, wherein an extension line of the movement locus of the linear movement of the contact portion of the sliding contact member that detects the contact signal passes near the center of rotation of the type wheel spindle.