JPH074952Y2 - Roll paper end detection device of roll paper supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a roll paper end detection device in a device for supplying roll paper to a table of an automatic drafting machine.

[Conventional technology]

This type of roll paper end detection device detects the end of the roll paper from the light emitter and the light receiver by the optical object detection device,
The detection signal is used to detect that the remaining amount of roll paper is exhausted, and an alarm buzzer or an alarm lamp is displayed, or the controller of the automatic drafting machine is stopped.

[Problems to be solved by the invention]

When the end of the roll paper is detected by the optical object detector, if the roll paper is transparent, it cannot be detected.
If the roll paper is translucent, the detector may malfunction. The present invention aims to solve the above problems.

[Means for solving problems]

In order to achieve the above object, the present invention rotatably supports roll paper on the front side of the table 2 and provides a roll paper winding member 16 on the rear device of the table 2 to drive the roll paper winding member 16 to rotate. In a device for supplying roll paper onto the table 2 by means of the pressure sensitive switch, which is arranged in contact with the roll paper in the movement path of the roll paper in the vicinity of the table 2 and outputs an on / off signal depending on the presence or absence of tension of the roll paper. 44, means for applying tension to the roll paper, which is provided in front of the pressure sensitive switch 44, and a controller for recognizing the end of the roll paper by the output signal of the pressure sensitive switch 44. is there.

[Action]

In the above configuration, the roll paper is in pressure contact with the pressure sensitive switch 44, and the pressure sensitive switch 44 outputs a switch ON signal in a state where pressure is applied from the roll paper. The roll paper is taken up by the take-up member 16 at the rear of the table 2, the remaining amount of the roll paper on the front end side of the table 2 is exhausted, the end of the roll paper approaches the pressure sensitive switch 44, and the roll paper is tensioned. When the roll paper is removed from the roll paper, tension is not applied to the roll paper, the paper pressure against the pressure sensitive switch 44 is lost, and the pressure sensitive switch 44 is turned off. This OFF signal, that is, the paper-out signal is supplied to a required paper-out warning device or controller, and the required operation is performed.

〔Example〕

The structure of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

Reference numeral 2 is a table of an automatic drafting machine, and an imaging head 4 is supported above the table so as to be movable in a predetermined direction along the XY coordinate plane of the table 2. The drawing head 4 is configured to be controlled by a known numerical control drive device. A sheet feeding drive roller 6 is rotatably supported by the machine frame on the rear side of the table 2, and the roller 6 is
As shown in FIG. 3, it is linked to the output shaft of the motor 12 via gears 8 and 10. The motor 12 is configured to be automatically controlled by a controller (not shown) of the automatic drafting machine, and can also be driven and controlled by a manual switch (not shown). Reference numeral 16 is a known paper winding member composed of a shaft rotatably supported by the machine frame, and is configured so that a paper winding core 18 can be detachably attached thereto by known means. . On the surface of the rope pulley 20 fixed to one end of the winding shaft 16 and the rope pulley 22 fixed to the output shaft of the motor 12,
An endless rope is slidably wound around the pulleys 20 and 22. Reference numeral 24 is a pinch roller fixedly mounted on a shaft body 26 rotatably supported by a member 25 which can be raised and lowered by a machine frame, and the pulling force of a spring 27 causes the drive roller 6 to move.
Is in elastic contact with the surface of. 30 is a guide roller rotatably supported on the machine frame on the front side of the table 2, and
An iron roller rotatably supported by a member that can be raised and lowered in the machine frame
32 is elastically contacted by the pulling force of a spring (not shown). The guide roller 30 is connected to the output shaft of the torque motor 31 and is biased in the direction opposite to the direction of rotation of the roll paper 40 to apply tension to the roll 40. Reference numeral 38 denotes a known paper feeding shaft rotatably supported by the machine frame, on which a core 42 fitted with the winding portion of the roll paper 40 can be removably attached by known means. It is configured. Reference numeral 44 denotes a pressure sensitive switch for detecting a sheet, which is located on the rear side of the table 2 and disposed below the moving path of the roll sheet 40. In the main body embodiment, the pressure sensitive switch 44 is composed of a limit switch. There is. The pressure sensitive switch 44
So that the switch piece can elastically contact the roll paper,
The height is set to be slightly above the movement path of the paper 40. The pressure sensitive switch 44 is connected to an alarm device such as a controller and a lamp. The controller is set so as to be in an operable state when the pressure sensitive switch 44 is in an ON state and to be in a stopped state when the pressure sensitive switch 44 is in an OFF state.

Next, the operation of this embodiment will be described. First, the core body 42, in which the paper 40 is wound in a roll shape, is attached to the paper delivery shaft 38. Next, the roll paper 40 is fed out from the core body 42 by a predetermined amount, the roller paper 40 is arranged between the guide roller 30 and the roller 32, on the table 2, and between the rollers 6 and 24, and the roll paper 40
Wrap the tip of the to the core 18. In this state, tension is applied to the roll paper 40 by the torque of the torque motor 31, and the roll paper 40 is pressed onto the table 2 by the tension, whereby the pressure-sensitive switch of the roll paper 40.
The floating of the portion near 44 is prevented. In that state,
The switch piece of the pressure sensitive switch 44 is pressed by the roll paper 40, and the pressure sensitive switch 44 is turned on. When the drawing start push button switch is pressed, the controller drives and controls the drive device that controls the drawing head 4 on the table 2,
A predetermined drawing is applied to the roll paper 40 on the table 2 by the drawing head 4. When the one-step drawing on the roll paper 40 on the table 2 is completed, the controller sets the motor 12
To drive. As a result, the drive roller 6 and the winding portion
When the roll paper 40 is synchronously rotated and the roll paper 40 is wound around the core body 18 by a predetermined amount, the driving of the motor 12 is stopped, and thereafter, the drawing work of the next step is automatically performed. When the motor 12 is driven with the remaining amount of the roll paper 40 on the core body 42 side being small and the end of the roll paper 40 is separated from between the rollers 30 and 32, the tension of the roll paper 40 disappears.
44 turns off. This allows the controller 14
Becomes a stopped state and a lamp lights up to warn of paper shortage. In this embodiment, the means for applying tension to the roll paper is constituted by the torque motor 31 which is connected to the guide roller 30, but it may be constituted by the paper pressing member 28 as shown in FIGS. . One of the members 28 is rotatably connected to the shaft 26, and the other of the members 28 is in contact with the upper surface of the rear end of the table 2 by its own weight.

〔effect〕

Since the present invention detects the presence or absence of the roll paper by the pressure sensitive switch as described above, there is an effect that the presence or absence of the paper can be surely detected even if the roll paper is transparent or translucent.

[Brief description of drawings]

FIG. 1 is an explanatory side view, FIG. 2 is a side view of a rear portion of a table, FIG. 3 is a plan view of the same, FIG. 4 is a side view of another embodiment, and FIG. It is a figure. 2 ... table, 4 ... imaging head, 6 ... driving roller, 8,10 ... gear, 12 ... motor, 16 ... paper winding member, 18 ... core, 20 ... rope pulley, 24 ... … Pinch roller, 28 …… Paper pressing member, 30 …… Guide roller, 32
...... Iron roller, 38 …… Paper feeding shaft, 40 …… Roll paper, 42 …… Core body, 44 …… Pressure sensitive switch

Claims (1)

[Scope of utility model registration request] 1. A roll paper winding member is rotatably supported on the front side of the table 2 and is rolled on the rear side of the table 2.
In an apparatus for providing roll paper on the table 2 by providing the roll paper 16 with the roll paper take-up member 16 rotationally driven, the roll paper is disposed in contact with the roll paper in a moving path of the roll paper near the table 2. Pressure-sensitive switch 44 that outputs an on / off signal depending on the presence or absence of tension on the roll paper
A means for applying tension to the roll paper, which is provided in front of the pressure sensitive switch 44, and the pressure sensitive switch.
A roll paper end detection device comprising: a controller for recognizing the end of the roll paper based on the output signal of 44.