JPH0231469Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inserter opening/closing mechanism that prevents a heavy inserter unit from falling when it is in the non-set position and locks the inserter unit when it is pushed down to the set position.

A conventional inserter opening/closing mechanism is shown in FIG.

The inserter 1 uses a feed roller 2 and a pressure roller 3 to suck in and eject a cut sheet 4 to the front of a platen 5, and a printing head 6 to print on the cut sheet. At this time, it is necessary to widen the printable area of the cut sheet 4 as much as possible, so
The feed roller 2 and the pressure roller 3 are placed as close to the platen 5 as possible. Therefore, when setting the continuous paper 7 on the pin tractor 8,
The inserter is rotated by the fulcrum 9 to the position indicated by the dotted line 10. At this time, the inserter is held by the rotational moment due to the inserter center of gravity 11.
This is done by receiving F' with a limiter 13 provided on the inserter mounting bracket 12.
Further, when the inserter is set, the set position is maintained by receiving the rotational moment F due to the center of gravity 14 on the stud 15. Furthermore, stud 15
is eccentric due to set position adjustment.

In such an inserter opening/closing mechanism, the weight of the inserter is supported by a regulating member such as a limiter or a stud to hold the inserter in the non-set position and lock it in the set position.
It was unstable due to vibrations, which caused problems in terms of safety and operability.

The purpose of the present invention is to solve these problems, and uses a simple mechanism using a cam and a spring to hold the inserter in the non-set position and lock it in the set position. This will be explained in detail.

FIG. 2 is a side view showing a main part of an embodiment of the present invention, and FIG. 3 is a front view of a part thereof.

In the figure, an inserter 16 is detachably attached to a support bracket 17. Support bracket 17 is rotatably mounted on shaft 19 on bracket 18. Bracket 18 also has cam surfaces 20, 21 and stops 22. 23 is a slider, and the cam surface 2
It has a shaft 24 that fits into an elongated hole 25 on the support bracket 17 with 0 and 21 in between. A spring 26 is applied between the shafts 24 and 19 to constantly draw the slider 23 toward the shaft 19. 27 is a collar that prevents the support bracket from coming off, and 28 and 29 are collars that prevent the slider 23 from coming off. Reference numeral 31 is a stud for regulating the set position of the inserter 16.

Next, the operation of the mechanism having the above configuration will be explained. Assume that the shaft 24 on the slider 23 is now in the position shown in FIG. 4 on the cam surface 20. When the rotational moment due to the inserter's own weight is F, the force f that tries to push the shaft 24 up along the cam surface 20 is f=Fcosη η=90°−(θ−ω) =Fsin(θ−ω) When the spring 26 The force t that tries to pull down the shaft 24 along the cam surface 20 is as follows: t=Tcos=θ−ω=Tcos(θ−ω).

Here, θ is a value determined by the movement range of the inserter 16, and F is determined by the weight of the inserter 16 and its positional relationship with the shaft 19.

Therefore, if the inclination ω of the cam surface 20 and the tension T of the spring 26 are set so that t>f over each range of θ above, the inserter 16 always has a counterclockwise moment (upward moment), The shaft 24 of the slider 23 is the stopper 22
It is held stably against vibrations even while in the non-set position.

Next, when the inserter 16 is rotated clockwise and dropped downward, the shaft 24 of the slider 23 climbs the cam surface 20 upward and to the right against the tensile force of the spring 26, and reaches the highest point 30 of the cam. When this point is exceeded, the force of the spring 26 is further added to the clockwise moment. Therefore, when the inserter 16 is pushed down to the set position where it abuts the stud 31, it is locked in that position by its own weight and the spring 26.

As explained above with reference to the embodiments, the present invention has a support bracket to which an inserter is attached, a long hole is provided in the direction of the rotational fulcrum, and a shaft that fits loosely into the long hole, and is slidable along the long hole. The inserter includes a slider supported by a slider, a spring that biases the shaft toward the pivot point, and a bracket having the pivot point and a cam surface against which the shaft moves. In either the non-set position or the set position, the rotational moment acts in a direction to maintain the position. Therefore, while the inserter is in the non-set position, it is prevented from falling due to vibration, etc., and when the inserter is pushed down to the set position, it is held as if it were locked, improving safety and operability. It has the effect of improving. In addition, in the present invention, the rotational moment f of the inserter is increased by increasing the inclination angle ω of the cam surface as described above.
Since it is possible to reduce the tension T of the spring, it is possible to reduce the tension T of the spring, which is advantageous in that it can be realized with a small and simple mechanism.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a side view showing a main part of an embodiment of the present invention, Fig. 3 is a front view of a part thereof, and Fig. 4 is an illustration of an embodiment of the present invention. It is an action explanatory diagram. 1, 16...Inserter, 5...Platen, 6
...Print head, 17...Support bracket,
18...bracket, 19...shaft, 20,
21... Cam surface, 22... Stopper, 23... Slider, 24... Shaft, 25... Long hole, 26
……spring.

Claims (1)

[Scope of Claim for Utility Model Registration] In an inserter opening/closing mechanism that positions an inserter for sucking and discharging tickets in a non-set position and a set position by a regulating member, the inserter is provided in one end so as to be integrated with the other end. The support bracket has a support bracket that rotatably supports the part on a rotation fulcrum, and further has a long hole in the direction of the rotation fulcrum between the ends, and a shaft that loosely fits into the long hole. a slider slidably supported by a slider; a spring biasing the shaft toward the rotation fulcrum; and a slope having the rotation fulcrum and separated by the highest point furthest from the rotation fulcrum An inserter opening/closing mechanism comprising: a bracket having a cam surface that moves in contact with the bracket;