JPH0421167Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is used in the field of printing machines such as time recorders, and specifically, it determines the printing stage of an inserted printing card. This invention relates to an improvement in a card stage feeding device.

[Conventional technology]

In a printing machine such as a time recorder that prints a printed card (time card) by one stage per day, or by one stage each in the morning and afternoon or between in and out, the card stage advance. A device is used to determine the printing stage of the inserted printing card. On the other hand, card feeding devices conventionally used in time recorders and the like include a gear type using a combination of a ratchet wheel and a rack, a roller type in which a card feeding roller is controlled and rotated by a motor to feed the card, and There are various types of devices, such as the screw shaft type, in which the nut of the card receiving lever is screwed onto a screw shaft rotated by a motor to feed the card in steps.
Among these devices, the screw shaft type card stage feeding device has a very simple structure and can be manufactured at low cost, so it is particularly widely used in small and simple time recorders.

[Problem that the invention attempts to solve]

However, the screw shaft type card feeder mentioned above is
If the CPU of the motor control device that rotates the screw shaft goes out of control due to a malfunction or other reason, the screw shaft will rotate too much and the nut of the card receiving lever will bite into the top or bottom end of the screw shaft and become tightened. Problems have arisen in which the screw shaft becomes locked or the nut or thread groove on the screw shaft is destroyed, which interferes with normal stage feeding.

Therefore, in order to prevent the nut from being tightened due to the CPU running out of control, it was considered to install a stopper on both the upper and lower ends of the screw shaft to stop the movement of the nut at a limit position, or a limit switch for the motor, etc. Even if the movement of the nut is stopped, the screw shaft continues to rotate due to the CPU running out of control.
The nut is substantially tightened in the restrained position;
In addition, there is a problem that the screw groove may be destroyed, and if a limit switch is provided, the structure becomes complicated, which affects the price, and once the limit switch is turned on, the motor stops and the screw shaft cannot be rotated. A separate means is required to reset the limit switch when the CPU returns to normal, and the structure becomes increasingly complex and expensive. It was not something that could be resolved.

Therefore, the technical problem of the present invention is that it is possible to prevent nuts from being tightened using extremely simple means, prevent damage to thread grooves, and also prevent the screw shaft from being rotated by a motor when restarting after repair. The purpose is to allow the card receiving lever to automatically resume movement just by doing so.

[Means for solving problems]

The measures taken in the present invention to solve the above technical problems are as follows.

(1) The upper and lower ends of the screw shaft into which the nut of the card receiving lever is screwed must be slightly thinner than the diameter of the threaded portion, and have no threads.

(2) A spring is provided on the shaft at the lower end to push up the nut of the card receiving lever, which has come off from the threaded part due to the lowering, to a position where it engages with the threaded part.

[Effect]

The above means works as follows.

Even if the CPU that controls the screw shaft motor goes out of control and causes the motor to rotate the screw shaft too much, the nut of the card receiving lever that has been raised or lowered will disengage from the threaded part of the upper and lower shaft parts. This prevents the nut from being tightened and the thread groove from being destroyed.

The nut of the card receiving lever, which has been raised to the upper end of the shaft due to excessive rotation of the screw shaft, can be repaired and then rotated again in the opposite direction, allowing the screws to engage with each other due to their own weight. When the nut is lowered to the lower end of the shaft, the nut is always pushed up by the spring to the position where it engages with the thread of the screw shaft. If the screw shaft is rotated again in the opposite direction after repair, upward movement can be automatically resumed due to the engagement of the screws.

As described above, the above-mentioned technical problem can be solved by the above-mentioned means, and the problems of the conventional technology can be solved.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a card feeding device for a printing machine according to the present invention will be described in detail with reference to the accompanying drawings.

In the figure, 1 is a case body of a time recorder, etc., and 2 is a screw shaft vertically installed in the case body 1 so as to be freely rotatable.
Reference numeral 3 indicates a motor that rotates the screw shaft 2 in forward and reverse directions via gears 4 and 5. 2a is a threaded portion formed on the circumferential surface of the screw shaft 2; 2b and 2c are upper and lower shaft portions of the screw shaft 2 that are made to have a slightly smaller diameter than the threaded portion 2a; Both ends are rotatably supported on the case body 1 side.

Reference numeral 6 denotes a card receiving lever for receiving the printed card T inserted from the card insertion opening 1a of the case body 1. A nut 7 connected to one end is screwed to the screw shaft 2, and is connected to the other end. The guide 6a is loosely fitted onto the guide shaft 8. 9 is the lower end shaft portion 2 of the screw shaft 2
The nut 7 of the card receiving lever 6, which has come off from the threaded part 2a due to excessive rotation of the screw shaft 2, is pushed by this spring 9 as shown in Fig. It is configured to be pushed up to a position where it engages with the threaded portion 2a.

In FIG. 1, 10 is a printer, 11 is a camshaft for moving the printer 10 for printing, and 12 is a space for housing a drive device (not shown) for the camshaft 11.

Since the card feeding device for printing machines according to the present invention has the configuration described above, the screw shaft 2 can be moved in either the forward or reverse direction by controlling the drive of the motor 3 according to a preset program. The nut 7 is moved up and down by controlled rotation, and the card receiving lever 6 is moved to a predetermined position to advance and determine the printing stage of the inserted printed card T. In addition, when rotating the screw shaft 2, if the motor 3 loses control due to runaway of the CPU that controls the motor 3 and the screw shaft 2 rotates too much, the card holder may be moved upward or downward. The nut 7 of the lever 6 is disengaged from the screw portion 2a at the upper and lower shaft portions 2b and 2c, respectively, so even if the screw shaft 2 continues to rotate, the nut 7 becomes free and does not move. , Nut 7 due to excessive rotation of screw shaft 2
This prevents tightening and damage to the thread groove.

In addition, the nut 7 that has moved to the upper or lower end shaft portions 2b, 2c and is disengaged will be moved to the upper end side when the motor 3 rotates the screw shaft 2 in the opposite direction after the repair. If it is being moved, it will engage with the threaded portion 2a due to its own weight and restart its movement, while if it has been moved toward the lower end, it will be pushed up by the spring 9 and will engage with the threaded portion 2a and restart its movement. However, by driving the motor 3, the card receiving lever 6 is moved to a predetermined position again, and the printing stage of the printed card T can be determined.

〔effect〕

As stated above, according to the present invention, it is possible to prevent the tightening of the nut and the destruction of the screw groove due to runaway CPU, so the biggest drawback of the screw shaft type card feeder can be prevented and it can be used safely. In addition to this, when the nut is restarted after repairs are completed, the nut that has come off the screw shaft will automatically engage and resume movement, so every time the case is restarted, the case body will be opened and the nut will re-engage with the screw shaft. It has the advantage that it does not require the trouble of restarting the system, greatly simplifies the effort at restarting, and has the economic advantage of being simple in configuration and being implemented at low cost.For example,
Suitable for use in simple or small time recorders, etc.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a printing machine embodying the present invention, and FIG. 2 is an enlarged sectional view of the main parts. 2 is a screw shaft, 2a is a screw part, 2b, 2c are upper and lower shaft parts, 3 is a motor, 6 is a card receiving lever, 7
is nut, 9 is spring, and T is printed card.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) When the nut of the card receiving lever is screwed onto the screw shaft and the screw shaft is rotated forward and backward by a motor, the card receiving lever moves up and down and is inserted. In the card stage feeding device that determines the printing stage of the coming printed card, both the upper and lower ends of the screw shaft are formed into a shaft part that is slightly thinner than the diameter of the threaded part and does not have a thread. A card for a printing machine, characterized in that a spring is provided on the lower end of the shaft portion of the card to push up the nut of the card receiving lever, which has come off from the threaded portion due to the lowering, to a position where it engages with the threaded portion. Stage feeding device. (2) The card feeding device for a printing machine according to claim 1, wherein the spring is a coil spring wound around the lower end shaft portion of the threaded portion.