JPH0754197Y2 - Tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a paper feed mechanism used in a printer or the like, and more particularly to an improvement of a tractor that travels a belt having pins protruding to feed a paper.

[Conventional technology]

FIG. 3 shows a paper feed mechanism 1 to which a general tractor is applied. A pair of tractors 4, 4 are slidably supported on a drive shaft 2 and a support shaft 3 each having a square cross section. There is. Each tractor 4 has a first frame 5 and a second frame 6, and both frames 5 and 6 are provided with an engaging piece 5a formed on the first frame 5 and having a claw at the tip and an auxiliary pin 5b, respectively. The outer wall of the tractor 4 is formed by being inserted into the rectangular opening 6a and the circular opening 6b formed in the frame 6 so as to be integrated. further,
A mounting piece 8 for mounting the paper pressing members 7A and 7B is formed on the second frame 6.

A drive pulley 9 is fitted on the drive shaft 2, and lock sleeves 10 are formed at both ends of the drive pulley 9 in the axial direction. The lock sleeve 10 includes four radial slits 11 and 11 which are circumferentially spaced from each other.
The inner peripheral surface of the lock sleeve 10 has a square cross section of the same size as the drive shaft 2, and the outer peripheral surface of the lock sleeve 10 has a substantially circular cross section.
Further, the lock sleeve 10 is formed with a protrusion (not shown) so as to hold the lock member 12. The lock member 12 is a substantially circular ring, and the inner peripheral surface of the lock member 12 has a circular cross section of the same size as the outer peripheral surface of the lock sleeve 10.

A driven pulley 13 is pivotally attached to the support shaft 3, and a belt 14 is attached to the driven pulley 13 and the drive pulley 9.
The belt 14 is wound around the drive shaft 2
The vehicle travels around the outer circumference of the tractor 4 based on the rotation of the. A plurality of pins 15, 15, ... Are provided on the outer peripheral surface of the belt 14 along the traveling direction of the belt 14 for feeding the paper S.
It is projected at the same pitch as P, P.

The paper pressing members 7A and 7B are supported by the attachment piece 8 of the second frame 6 so as to be vertically rotatable at the upper end and the lower end of the tractor 4, respectively. Each paper pressing member 7A, 7B is provided with a slit 16A for escaping the pin 15 so that only the paper S can be pressed in the closed position, and a spring 16B for urging in the closing direction is attached. .

By the way, conventionally, the tractor 4 has been provided with a paper detection sensor 17, as shown in FIG. The paper detection sensor 17 is specifically attached to the outside of the first frame 5 of the tractor 4, and the actuator 18 of the paper detection sensor 17 is provided on the conveyance path of the paper S above the first frame 5. It faces the sheet S and comes into contact with it.

The control circuit of the printer is configured so that the printer does not perform the printing operation unless the paper S comes into contact with the actuator 18 of the paper detection sensor 17 and the paper detection sensor 17 is closed. Has been done.

[Problems to be solved by the invention]

In the above-described conventional printer, as shown in FIG. 2A, the lead wire 19 extending from the paper detection sensor 17 is used.
A cover 20 attached to the first frame 5 of the tractor 4 to cover the first frame 5 is provided to support the tractor 4, and the lead wire 19 is fitted into the recess 21 formed in the cover 20. As shown in B, the lead wire 19 was supported by attaching the cover 20 to the first frame 5.

However, providing the cover 20 to support the lead wire 19 of the paper detection sensor 17 in this way increases the cost because the number of parts increases. If the lead wire 19 is left free without providing such a cover 20, the lead wire 19 may be broken.

In view of such a point, the present invention has an object to provide a tractor which can stably support the lead wire of the paper detection sensor without fear of disconnection and can be manufactured at low cost.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a frame,
A cover integrally formed on the upper part of the frame is wound around a drive pulley and a driven pulley supported by the frame, and a belt having pins protruding from the frame is wound. In a tractor in which a sheet detection sensor actuator faces a sheet, the cover has a substantially L-shaped cross section and is formed to extend to an intermediate position in the vertical direction of the frame. The paper detection sensor is located on a side portion of the frame, and a support arm is projectingly provided at one end portion of the frame below a lower end of the cover, and at a lower end of the cover facing the support arm. A recess for receiving the lead wire is formed, and the lead wire of the paper detection sensor is supported and fitted by the support arm and the recess of the cover. It is characterized by a door.

[Action]

According to the present invention having the above-described configuration, since the paper detection lead wire is supported and fitted by the support arm protruding from the frame and the concave portion of the cover, it is possible to increase the number of parts without increasing the number of parts.
The lead wire can be stably supported, breakage of the lead wire can be prevented, and the manufacturing cost can be reduced.

〔Example〕

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings. It should be noted that the same components as those of the conventional one described above are denoted by the same reference numerals in the drawings, and the description thereof will be omitted.

FIG. 1 shows an embodiment of a tractor according to the present invention, in which a driven pulley 13 and a cover 22 extending in a semi-opposite direction are integrally provided on an upper portion of a first frame 5 of the tractor 4. There is. The cover 22 includes an upper wall 23, a side wall 24 extending from an outer end of the upper wall 23, and a pair of ends interposed between the side wall 24 and both front and rear ends of the first frame 5. Wall 25
The lower ends of the side wall 24 and both end walls 25A, 25B reach about half of the first frame 5 in the vertical direction. Further, the side wall 24 is formed with recesses 26 and 27 for escaping the drive shaft 2 and the support shaft 3 shown in FIG. 3. Further, the side wall 24 is provided with a paper detection sensor 17 for the first frame 5. Recesses 29, 29 for escaping screws 28, 28 for attaching to

An L-shaped support arm 30 is integrally provided at the front end of the first frame 5 so as to project therefrom.
The horizontal projection 31 located at the lower end of the side wall faces directly below the cover 22 and faces the lower end of the side wall 24 with a space. The minimum distance between the side wall 24 and the horizontal projection 31 is set so that the lead wire 19 can be inserted relatively densely. Further, a concave portion 32 capable of receiving the lead wire 19 is formed at the lower end of the front end wall 25A of the cover 22.

According to the configuration described above, the lead wire 19 is connected to the side wall 24 of the cover 22.
And the horizontal protrusions of the support arm 30 by press-fitting between the horizontal protrusions 31.
When seated on 31, the lead wire 19 will attach to the side wall of the cover 22.
24, the recess 32 of the front end wall 25A and the upright portion 33 of the support arm 30
With this, the outer periphery is held and is stably supported on the horizontal projection 31, and there is no possibility that the lead wire 19 is disconnected.

As described above, according to this embodiment, the lead wire 19 can be stably supported, and further, the cover 22 and the support arm 30.
Since each of them is formed integrally with the first frame 5 of the tractor 4, the number of parts does not increase as compared with the case where the lead wire 19 is not supported, and it can be manufactured at low cost.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

[Effect of device]

As described above, according to the present invention, it is possible to stably support the lead wire, and moreover, it is possible to manufacture at low cost.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a tractor according to the present invention, FIGS. 2A and 2B are schematic perspective views showing a conventional tractor in an exploded and assembled state, and FIG. 3 is a general tractor applied. It is a perspective view of a paper feed mechanism. 1 ... Paper feed mechanism, 2 ... Drive shaft, 3 ... Support shaft, 4 ... Tractor, 5 ... First frame, 6 ...
2nd frame, 14 ... Belt, 15 ... Pin, 17 ... Paper detection sensor, 18 ... Actuator, 19 ... Lead wire, 20,22 ... Cover, 23 ... Top wall, 24 ... Side wall , 25A, 2
5B ... End wall, 30 ... Support arm, 31 ... Horizontal projection, 32 ...
… Concave part, 33 …… Upright part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masami Yamashita Inventor Masami Yamane, No. 1 Naganeyama, Kyowa Town, Obu City, Aichi Prefecture Tokai Kogyo Co., Ltd. (56) References JP-A-53-60229 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A belt having a frame and a cover integrally provided on an upper portion of the frame, wherein a belt having pins protruding from the drive pulley and a driven pulley supported by the frame is wound around the frame. In a tractor in which a sheet detection sensor actuator faces a position where the sheet comes into contact with the sheet, the cover has a substantially L-shaped cross section and extends to an intermediate position in the vertical direction of the frame. The sensor for paper detection is located on the side of the frame inside the cover, and a supporting arm is projected below the lower end of the cover at one end of the frame, and A recess that can receive a lead wire is formed at the lower end facing the support arm, and the support arm and the cover recess form the recess of the paper detection sensor. Supporting the lead wires, tractor, characterized in that fitted.