JPS6114442Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a device for cutting a medium that is attached to a printer and has been subjected to print processing, and is capable of cutting the medium in the vicinity of the printing position. It is related to the device.

BACKGROUND TECHNOLOGY This type of media cutting device has a media cutting member attached to a carriage carrying a printing head and traveling along a platen so as to be able to move forward and backward toward the printing medium.
A device is known in which a medium is cut by moving a carriage with the medium cutting member advanced toward the medium by a solenoid.

Problems to be Solved by the Invention However, using a solenoid to move the media cutting member forward and backward requires an independent drive source called a solenoid, and there is a problem in that the switching sound of the solenoid is loud when the media cutting member moves back and forth.

The purpose of this invention is to improve this type of conventional media cutting device, and to obtain a media cutting device that does not require an independent drive source and does not have the risk of generating noise when the media cutting member moves back and forth.

Means for Solving the Problems This invention is characterized in that the medium cutting member mounted on the carriage is moved forward and backward using the movement movement of the carriage.The medium cutting member 12 mounted on the carriage 5, 12a, 22 are urged in the retracting direction by a spring 15, and an actuating body 23 is mounted on the carriage 5 and is provided to engage and disengage the medium cutting members 12, 12a, 22. When the carriage 5 is moved by a width greater than the printing width, the actuating body 2 comes into contact with the frame of the printer or other immovable member at the end of its left-right movement and is displaced relative to the carriage 5.
3, the displacement in one direction of the medium cutting member 12,
The feature is that 12a and 22 are advanced.

Function The medium cutting member 12 mounted on the carriage 5,
12a and 22 are in the retracted position due to the biasing force of the spring 15 and do not contact the print medium 3 in the normal state, so even if the carriage 5 runs, the print medium 3
Do not cut. Move the carriage 5 to the right or left (left in the illustrated embodiment) beyond its maximum printing width.
When the actuating body 23 is brought into contact with the stationary member, the actuating body 23 is pushed by the stationary member and displaced with respect to the carriage 5. This displacement causes the actuating body 23 to engage with the medium cutting members 12, 12a, 22, thereby causing the medium cutting members 12, 12a, 22 to advance.

When the carriage 5 is run in this state, the advanced medium cutting members 12, 12a, 22 run while contacting the print medium 3 and cut the medium 3.
The carriage 5 moves as it is to the opposite moving end, and there again contacts the immovable member, thereby displacing the actuating body 23 in the opposite direction. When the engagement is released, the media cutting members 12, 12a, 22
is returned to the retracted position again by the biasing force of the spring 15. Through this operation, the medium cutting members 12, 12a, 22 mounted on the carriage can be moved forward and backward to perform a medium cutting operation as necessary.

Embodiment FIG. 1 is a side view showing the main parts of a printer equipped with a medium cutting device according to this invention, in which 1 is a platen, 2 is a friction plate that is pressed against the platen 1, and grips and feeds a medium 3. 4 is a print head, 5 is a carriage on which the print head is mounted, 6 and 7 are guide rods that guide the carriage 5, and 8 is engaged with a marginal punch hole of the continuous medium 3 to insert the medium 3.
9 is a medium guide plate; 10 is a concave groove formed by bending the medium guide plate 9 and parallel to the platen 1; 11 is a support frame fixed to the carriage 5; 12 is a support frame 11 Concave groove 10
It is a blade that is attached so that it can move forward and backward toward the target.

As shown in FIG. 2, the blade body 12 has an engaging projection 1.
3, is pivotally connected to the support frame 11 by a pin 14, and is biased in the retracting direction by a tension spring 15 stretched between the support frame 11 and the support frame 11. The retracted position of the blade 12 is the support frame 1
It is regulated by a stopper 16 planted at 1.

A rod 17 is horizontally mounted on the support frame 11 so as to be able to slide freely parallel to the traveling direction of the carriage 5 behind the blade body 12, and the rod 17 has a cam that engages and disengages from the engagement protrusion 13 of the blade body. 18 is fixed. Both ends of the rod 17 protrude from the support frame 11, and buffer members 19, 20 are attached to the tips thereof, and when the carriage 5 is moved beyond the printing width, the buffer members 19, 20 come into contact with immovable members (not shown). The rod 17 is slidably displaced relative to the carriage 5 in contact with the carriage 5.

That is, in the illustrated embodiment, the actuating body 23 is constituted by the rod 17, the cam 18, and the buffer members 19, 20. When the carriage 5 reaches the left movement end, the rod 17 is displaced to the right and the cam 18 is moved. When the carriage 5 reaches the right moving end, the rod 17 is displaced to the left, the engagement between the cam 18 and the protrusion 13 is released, and the blade body 12 is advanced. is retracted by the force of the spring 15. While the printing head 4 is performing a normal printing operation, the carriage 5 reciprocates with a width that does not reach its left and right end of movement, so the blade 12 is held in a retracted state.

In the embodiment shown in FIG. 1, a groove 10 is provided facing the blade 12, but if the blade 12 is sufficiently sharp or by a medium ejection roller device or other means, printing can be performed. If the cutting operation is performed with the medium 3 under tension, it is also possible to cut the medium 3 without providing such grooves 10. Furthermore, instead of the knife-shaped blade 12, a rotary blade 12a as shown in FIG. 3 may be used, or as shown in FIG.
A blade body 21 that spans the entire width of the print medium 3 is fixed at the position of the groove 10 in the figure, and a grooved roller 22 that moves forward and backward toward this blade body 21 is provided on the carriage 5 side, and this grooved roller 22 advances. It is also possible to cut the printing medium 3 by moving it along the blade 21. In either configuration, the medium cutting members such as the blade 12, the rotary blade 12a, and the grooved roller 22, which are attached to the carriage 5 so as to be able to move forward and backward, are actuating members that are displaced by contacting an immovable member at the left and right ends of the carriage 5. 23 and spring 1
5 can be configured to move forward and backward through cooperative operations.

Effects of the Invention As described above, in the media cutting device in the printer according to this invention, the media cutting member is attached to the carriage that runs along the platen so as to be able to move forward and backward, and the carriage is run with the media cutting member advanced. In a device designed to cut printing media, the media cutting member is moved forward and backward using the movement of a carriage, so the media cutting device does not have its own drive source at all. There is no need to provide one, and the structure is not only inexpensive and simple, but also has the effect that there is no risk of noise being generated from the drive source.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the main parts of a printer equipped with a media cutting device according to this invention, Fig. 2 is a plan view showing a mechanism for advancing and retracting a media cutting member, and Fig. 3 is a side view showing a mechanism for advancing and retracting a media cutting member. FIG. 4 is a plan view showing an example in which a grooved roller is used as a medium cutting member. 1: platen, 3: medium, 4: print head,
5: Carriage, 10: Concave groove, 11: Support frame, 12: Blade body, 12a: Rotating blade, 13: Protrusion,
15: Spring, 17: Rod, 18: Cam, 19,
20: Buffer member, 21: Blade body, 22: Grooved roller, 23: Operating body.

Claims (1)

[Scope of utility model registration request] A medium cutting member is attached to a carriage carrying a printing head and traveling along a platen so as to be able to move forward and backward toward the printing medium and being biased in a retracting direction,
In a media cutting device for a printer that cuts a print medium by running a carriage with the cutting member advanced, an actuating body that engages and disengages from the medium cutting member is provided on the carriage, and the actuating body When the carriage is moved beyond the maximum printing width, it comes into contact with an immovable member at the end of its left and right movement and is displaced relative to the carriage, and displacement of the actuating body in one direction causes the media cutting member to move. A media cutting device in a printer, which is characterized by a cutting edge.