JPH02132018A - Cardboard/envelope separation mechanism in paper feeder - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cardboard/envelope separation mechanism used in a paper feeding device mounted on a printing device.

[Conventional technology]

Conventionally, as shown in FIG. 7 and FIG.
A pressure plate 103 is provided to be rotatable about a rotation axis 03a, and a pressure plate 103 is always moved in the direction of the paper feed roller 102.
03, the hopper zero body 101 that deposits the sheet 105 supported between the paper feed roller 102 and the pressure plate 103, and the flat surface on which the sheets 105 stacked integrally with the hopper body 101 come into contact. It is composed of a separation feeding section 101a having a sloped surface, and a pressure plate 103
The paper 105 pressed against the paper feed roller 102 was separated by the rotation of the paper feed roller 102 and the separation/feeding portion 101a.

[Problems to be Solved by the Invention] However, in the cardboard/envelope separating mechanism used in a paper feed device that is provided with a separating and feeding section using such a flat inclined surface, when separating accumulated sheets, the paper Since the angle of inclination between the separating and feeding section and the paper varies depending on the number of sheets stacked, it is necessary to limit the number of sheets stacked or change the axis 1.
There was a drawback that the distance between 03a and the paper feed roller 102 had to be increased.

The present invention solves this problem, and even in the case of a paper feed device that presses stacked sheets of paper onto a paper feed roller using a compression force that rotates around a pivot, the paper can be easily removed regardless of the number of stacked sheets of paper. The purpose of the present invention is to provide a separation mechanism that performs separation of .

[Means for Solving the Problems] The cardboard/envelope separation mechanism in the paper feeder according to the present invention includes a paper feed roller that is driven to rotate, and a pressure plate that is rotatable about a pivot shaft and that stacks paper. In the paper device, the paper stacking section has a separation feeding section having a concave curve toward the pivot, and even if the pressure plate rotates, the separation between the uppermost sheet of the paper and the separation feeding section is prevented. It is characterized by little change in angle.

[Effect]

The cardboard/envelope separation mechanism of the paper feeding device configured as described above consists of a rotationally driven paper feeding roller and a pressure plate that is rotatable about a pivot shaft. The uppermost sheet of the stacked sheets collides with the separating and sending section 1a in the sending direction of the sheet stacking section as the paper feeding roller rotates. The next sheet of paper that hits will try to be sent out by sliding through the separation and delivery section, but the angle between the topmost sheet and the separation and delivery section should be adjusted so that the angle changes within a narrow range regardless of the number of stacked sheets. In the separating and feeding section that has a curved section, only the topmost sheet overcomes the sliding resistance at the separating and feeding section and is sent to the printing device, and the second and subsequent sheets of paper are moved by the reaction force of the topmost sheet. The sliding resistance increases due to the pressure against the separation and delivery section, and the material remains deposited without being sent out. The object of the present invention is achieved by the above-described operation. [Embodiment] An embodiment of the present invention will be described based on the drawings.

A perspective view of an embodiment of the present invention is shown in FIG. 1, and a sectional view is shown in FIG. 2.

A paper feed roller 2 that is rotationally driven; a pressure plate 3 that regulates the lateral position of the stacked paper sheets 5 and is rotatable about a pivot shaft 3a; a spring 4 that acts to press in the direction so that the topmost sheet of the paper feed roller 5 comes into contact with the paper feed roller 2 while maintaining an appropriate pressure;
It is composed of a holder main body 1 on which sheets 5 are stacked, and a separating and sending section 1a which is integrated with a holder body 1 and has a curved portion in the direction in which the sheets 5 are sent out.

Next, the effect will be explained.

Figure 3 is a diagram explaining the effect on the topmost paper, Figure 4
The figure is a diagram illustrating the effect on the paper below the topmost paper.

In the above configuration, when a large number of sheets are piled up, the uppermost sheet indicated by the dashed-dotted line shown in FIG.
The angle of is θ, and the uppermost sheet is separated by the rotation of the paper feed roller 2 and the separation/feeding section 1a.

When 2 to 5 sheets of paper are stacked, the angle between the uppermost sheet indicated by the solid line and the separation sending section 1a is θ, and the uppermost sheet is separated by the rotation of the paper feed roller and the separation sending section 1a. .

Therefore, changes in the angle due to changes in the number of stacked sheets of paper become small. Since the separating and feeding portion 1a is formed as a curved portion in this way, there is no need to increase the distance between the pivot and the paper feed roller.
Paper can be separated regardless of the number of sheets stacked.

In addition, in the present invention, as shown in FIG. 5, a structure may be adopted in which the separating and sending portion has a curved surface intermittently.

Furthermore, in the present invention, it is also effective to attach 2 lb of tape to the separating and sending portion so as not to use the friction coefficient μ of the material. (Fig. 6) [Effects of the Invention] As explained above, the present invention employs a separating mechanism in which the shape of the separating and feeding section is curved, so that regardless of the amount of stacked sheets, the uppermost sheet and the separated sheet can be separated and fed out. Since the angle formed by the two parts is within a certain range, the paper can be separated even in the separation mechanism of the paper feeder, which uses a pressure plate that is rotatable about the pivot axis, preventing double feeding and feeding. This has a great effect on reducing the occurrence of separation defects such as paper defects.

Furthermore, since the structure is simple, it can be provided at low cost, which is a big advantage.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a sectional view showing an embodiment of the present invention. Figure 3. FIG. 4 is an explanatory diagram showing the operation of the present invention. FIG. 5 is a diagram showing another embodiment. FIG. 6 is a diagram showing another embodiment. FIG. 7 is a perspective view showing a conventional example. FIG. 8 is a sectional view showing a conventional example. 1...Holder body 1a...Separation sending section 2...Paper feed roller 3... Pressure plate 3a...Axis 4...Spring 5...Paper 11a...rib 2lb...tape 101...Hopper body 101a... Separation sending section 102...Paper feed roller 103... pressure plate 104...Spring 105...Paper that's all Applicant: Seiko Epson Corporation Applicant: Orient Watch Co., Ltd. Representative Patent Attorney Kisaburo Suzuki and others 1a Figure 4 1a 27a Figure 7

Claims (1)

[Claims] In a paper feeding device having a rotationally driven paper feeding roller and a pressure plate which is rotatable about a pivot shaft and which stacks paper, a separation feeding portion having a concave curve toward the pivot is connected to the paper stacking portion and the stacking portion. A separating mechanism for cardboard/envelopes in a paper feeding device, characterized in that the angle between the topmost sheet of paper and the separating and feeding section does not change much even when the pressure plate rotates. .