JPS61252914A - Paper winding drum and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the occurrence of deflection due to eccentricity or the like at the time of rotation, by fitting a center shaft holding member in a cutting part of a paper winding drum of a facsimile device or the like, while raising a degree of size accuracy between a drum circumferential surface and a center shaft. CONSTITUTION:Making an outer circumferential surface of a drum body 1 a criterion, a cutting part 2 is machined and set to an inner circumferential surface of this drum body 1, while an outer circumferential surface of a center shaft holding member 3 is machined with a center shaft 6 to be installed in a central part as a criterion. Since the center shaft holding member 3 is being fitted in the cutting part 2, size accuracy between the outer circumferential surface of the drum body 1 and the center shaft 6 is sufficiently improvable in a way of improving both accuracies in the fitting size and the machining. Therefore, at the time of drum rotation, a possibility of entailing deflection due to eccentricity or the like is thus lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a paper winding drum used in facsimile machines, copying machines, etc., and a method for manufacturing the same.

[Technical background of the invention and its problems] Paper winding drums used in facsimile machines, copying machines, etc. are made of plastic, aluminum, etc. and have a drum body that has a slit for fixing the paper in the axial direction, and a drum body that is made of plastic, aluminum, etc. It consists of a center shaft made of metal such as cast iron that is attached so as to protrude from the center of both sides. Then, the leading edge of the recording paper or transmission original is inserted into the paper fixing slit and fixed by a vapor support, and the recording paper or transmission original is wrapped around the outer circumferential surface of the drum body and then rotated by the center shaft. .

By the way, during this drum rotation, there must be no wobbling due to eccentricity or the like. Therefore, the dimensions of the outer peripheral surface of the drum and the center shaft are required to be highly accurate. For this reason, conventionally, when manufacturing paper winding drums, the drum body and the center shaft mounting part were integrally formed using a method such as extrusion molding using aluminum or plastic, and then the center shaft mounting part was formed integrally using a method such as extrusion molding. The center shaft was fixed to the section.

However, when forming it integrally by extrusion molding etc., an expensive mold is required and the process is complicated.
Manufacturing costs were high. In addition, the dimensional accuracy between the outer peripheral portion of the drum and the center shaft was not sufficient, and there was a risk that vibrations would occur due to eccentricity or the like during rotation of the drum.

(Object of the Invention) An object of the present invention is to provide a paper winding drum that has high dimensional accuracy between the outer circumferential surface of the drum and the center shaft, eliminates the risk of wobbling due to eccentricity during rotation, and can be manufactured at low cost. I am going to do something.

Another object of the present invention is to provide paper that can improve the dimensional accuracy between the outer peripheral surface of the drum and the center shaft, eliminates the risk of wobbling due to eccentricity during rotation, and is simple in process and reduces manufacturing costs. An object of the present invention is to provide a method for manufacturing a winding drum.

[Summary of the invention]

The present invention provides a drum body, a cutting portion formed on the inner circumferential surface of the drum body over a predetermined width from both sides with reference to the outer circumferential surface of the drum body, and a center shaft holder fitted into these cutting portions. a member, a center shaft holding hole formed at the center of these center shaft holding members, a center shaft inserted into these center shaft holding holes, and a paper sheet provided in the axial direction with respect to the drum body and the center shaft holding member. This is a paper winding drum consisting of a fixing slit.

In addition, the present invention cuts the inner circumferential surface of the drum body over a predetermined width from both sides based on the outer diameter of the drum body, and cuts the outer circumferential surface of the center shaft holding member that holds the center shaft at the center. The center shaft is cut using the center shaft as a reference, and this center shaft holding member is fitted into the cutting part provided on the inner circumferential surface of the drum body to integrate it, and then the integrated drum body and center shaft holding member are This is a method of manufacturing a paper winding drum in which a paper fixing slit is formed in the axial direction of the paper winding drum.

[Embodiments of the invention]

1 and 2 are a partial sectional view and a side view showing a paper winding drum in an embodiment of the present invention. 1st
In the figures and FIG. 2, reference numeral 1 denotes a drum body made of plastic or aluminum by a method such as molding, and cutting portions 2 are formed over a predetermined width on both sides of the inner peripheral surface of the drum body 1. . Reference numeral 3 denotes a center shaft holding member fitted into the cutting portion 2, and like the drum body 1, it is made of plastic or aluminum by a method such as molding. This center shaft holding member 3 is fitted until it comes into contact with a stepped portion 4 formed by cutting on the inner circumferential surface of the drum body 1, and is fixed to the drum body 1 with an adhesive or the like so as to be integrated with the drum body 1. It becomes. A center shaft holding hole 5 is provided in the center of the center shaft holding member 3, and a center shaft 6 made of cast iron or the like is inserted into the holding hole 5 so as to be parallel to the axial direction of the drum body 1. is inserted into the In this case, one end of the center shaft 6 in the thrust direction is inserted up to the position of the crotch seat 4, and the other end projects from the side surface of the drum body 1. 7 is a ring fixed to the side surface of the drum body 1 by screwing or the like. 8 is the integrated drum body 1. This is a paper fixing slit provided in the axial direction of the drum body 1 with respect to the center shaft holding member 3 and the ring 7.

Next, what is shown in Figures 1 and 2? A method of manufacturing a gun wrapping drum will be explained. First, the drum body 1 is formed using a method such as molding using plastic or aluminum as a raw material. Then, the drum body 1 is cut by cutting over a predetermined width on both sides of the inner circumferential surface of the drum body 1 with reference to the outer circumferential surface of the drum body 1, thereby forming the cut portions 2. Also,
A center shaft holding member 3 is formed by a method such as molding using the same raw material as the drum body 1, and a center shaft 6 is inserted into a center shaft holding hole 5 provided at the center of the center shaft holding member 3. wear it. In this case, the center shaft 6 is inserted until one end of the center shaft 6 in the thrust direction becomes flush with one end of the center shaft holding member 3.

After the center shaft 6 is inserted into the center shaft holding member 5, cutting is performed on the outer circumferential surface of the center shaft holding member 3 using the center shaft 6 as a reference. In this case, the outer diameter of the center shaft holding member 3 is made to be approximately the same as the inner diameter of the cut portion of the drum body 1. Next, the center shaft holding member 3 is fitted into the cut portion 2 formed on the inner circumferential surface of the drum body 1, and is inserted until it abuts the stepped portion 4. Then, the drum body 1 and the center shaft holding member 3 are adhesively fixed using an adhesive or the like to be integrated. Next, after providing rings 7 on both sides of the drum body 1, the integrated drum body 1. A paper fixing slit 8 is formed in the center shaft holding member 3 and the ring 7 in the axial direction of the drum body 1. In this way, a paper winding drum is manufactured.

In the paper winding drum manufactured by such a process, a cutting part 2 is cut on the inner circumferential surface of the drum body 1 with reference to the outer circumferential surface of the drum body 1, and a center shaft provided at the center part is cut. 6 as a reference, and the center shaft holding member 3 is fitted into the cut portion 2, so the dimensional accuracy between the outer circumferential surface of the drum body 1 and the center shaft 6 is , can be sufficiently increased by improving the precision of fitting dimensions and the precision of cutting. Therefore, there is less risk of blurring due to eccentricity or the like when the drum rotates, so it is suitable as a paper winding drum for facsimile machines, copying machines, and the like. In addition, unlike the conventional method, an expensive mold is not required and it can be realized through a simple manufacturing process, so that manufacturing costs can be reduced. Generally speaking, since the paper fixing slit 8 is processed in the final process, there is no difficulty in manufacturing.

Note that the present invention is not limited to the above embodiments.

For example, in the above embodiment, the outer circumferential surface of the center shaft holding member 3 is cut after the center shaft 6 is inserted into the center shaft holding hole 5, but the outer circumferential surface of the center shaft holding member 3 is cut. After that, the center shaft 6 may be inserted. It goes without saying that various other modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, there is provided a drum body, a cutting portion formed on the inner circumferential surface of the drum body over a predetermined width from both sides with reference to the outer circumferential surface of the drum body, and a center fitted in these cutting portions. A shaft holding member, a center shaft holding hole formed at the center of these center shaft holding members, a center shaft inserted into these center shaft holding holes, and a center shaft provided in the axial direction with respect to the drum body and the center shaft holding member. Since the slit for fixing the paper is made of paper, the dimensional accuracy between the outer peripheral surface of the drum and the center shaft is high, there is no risk of wobbling due to eccentricity during rotation, and it is possible to provide a paper winding drum that can be manufactured at low cost. .

Further, according to the present invention, the inner circumferential surface of the drum body is cut over a predetermined width from both sides based on the outer diameter of the drum body, and the outer circumference of the center shaft holding member that holds the center shaft at the center is cut. The surface is cut using the center shaft as a reference, and this center shaft holding member is fitted into the cut part provided on the inner circumferential surface of the drum body to integrate it, and then the integrated drum body and center shaft holding member are integrated. Since the paper fixing slit is formed in the axial direction of the member, it is possible to improve the dimensional accuracy between the outer peripheral surface of the drum and the center shaft, there is no risk of wobbling due to eccentricity during rotation, and the process is simple. It is possible to provide a method for manufacturing a paper winding drum that can reduce manufacturing costs.

[Brief explanation of the drawing]

1 and 2 are a partial sectional view and a side view of a paper winding drum in an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Drum body, 2... Cutting part, 3... Center shaft holding member, 4... Step part, 5... Center shaft holding hole, 6... Center shaft, 7...
・Ring, 8...Slit for fixing paper. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (2)

[Claims] (1) A drum body, cutting portions formed on the inner circumferential surface of the drum body over a predetermined width from both sides with reference to the outer circumferential surface of the drum body, and a center shaft holding member fitted into these cutting portions. , a center shaft holding hole formed in the center of these center shaft holding members, a center shaft inserted into these center shaft holding holes, and a paper fixing member provided in the axial direction with respect to the drum body and the center shaft holding member. A paper winding drum characterized by comprising a slit for winding paper. (2) The inner circumferential surface of the drum body is cut to a predetermined width from both sides based on the outer circumferential surface of the drum body, and the outer circumferential surface of the center shaft holding member that holds the center shaft at the center is cut at the center. The center shaft holding member is cut using the shaft as a reference, and the center shaft holding member is fitted into the cutting part provided on the inner circumferential surface of the drum body to integrate it, and then the integrated drum body and center shaft holding member are A method for manufacturing a paper winding drum, characterized in that a paper fixing slit is formed in the axial direction.