JPH085302A - Long-body take-up device for measurement - Google Patents

Abstract

PURPOSE:To provide a tape measure with the simple constitution, which can impart damping force on a take-up drum. CONSTITUTION:A bearing 4a of a take-up drum is rotatably supported with a supporting shaft 1a in a case 1. A driving spring is housed in the take-up drum. The diameter of the supporting shaft 1a is smaller than the inner diameter of the bearing 4a. The take-up drum is supported with backlash. When a measuring tape 6 is taken up, the tape is supported with the weight of the take-up drum in the eccentric pattern with the supporting shaft 1a. The peripheral edge of the take-up drum comes into contact with a guide part 4c, and a damping force with abrasion is applied. Thus, the increase in rotating speed of the take-up drum is suppressed. The take-up drum jumps in the case 1 due to the backlash between the supporting shaft la and the bearing 4a. The damping force is also applied with the contact of the side surface and the peripheral edge with the case 1, and the increase in the rotating speed can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring long body winding device for winding a measuring long body such as a tape measure or a black ink jar.

[0002]

2. Description of the Related Art Conventionally, length and distance are measured using a measuring tape made of steel plate, woven fabric, plastic material or the like. The measuring tape is usually wound in a hand-wound or self-winding storage case. The measuring tape used for the automatic tape measure has a gutter-shaped cross section, and tends to be linear when pulled out from the case. An automatic winding device that automatically winds a measuring tape uses a winding drum biased by a drive spring. When the measuring tape wound on the winding drum is pulled out, the drive spring is stored, and the stored measuring tape is automatically wound up by the stored force.

Also, in the ink jar, one in which a measuring thread for marking a straight line is automatically wound by a similar mechanism is used.

[0004] In such an automatic winding device, in order to completely wind up the long body for measurement, the drive spring is given a certain amount of energy even in the complete winding position, and the winding is performed. A strong spring is used to overcome the frictional force when picking. For example, in a tape measure, when the measurement tape is pulled out and rewound by about 3 m or more, the winding speed of the measurement tape increases, the measurement tape bounces, the measurement tape is damaged, and There is a risk of injury and other accidents.

In the tape type measuring device disclosed in Japanese Patent Laid-Open No. 58-15721, a flat weight is attached to the winding drum, and when the rotation speed of the winding drum increases, the weight is braked by the centrifugal force. By taking frictional engagement with the surface, the take-up speed of the measuring tape is suppressed, and measures are taken to prevent danger.

Although the measures described in the above publication are effective, there is a problem that the number of parts increases and the labor of assembling also increases.

An attempt has been made to provide a guide portion that makes frictional contact with the peripheral edge of the conventional winding drum.
Since the guide portion is always in contact with the guide portion, a constant braking force is always exerted, resulting in a large load on the take-up drum, resulting in obstruction of the take-up. In addition, when dust or the like is caught, the take-up drum locks on the guide portion and cannot rotate.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and suppresses an increase in the rotation speed of the winding drum with a simple mechanism that does not increase the number of parts. It is an object of the present invention to provide a measuring long-body winding device capable of measuring.

[0009]

According to the present invention, there is provided a winding drum having a winding spring which is supported by a support shaft and which winds a long measuring member, and a long measuring member having a case for accommodating the winding drum. In the body winding device, a guide portion that supports the bearing of the winding drum with play by the support shaft and contacts the peripheral edge of the winding drum when the winding drum is eccentrically supported by the support shaft. Is provided in the case.

[0010] It is also characterized in that the measuring long body is a measuring tape or a black ink thread.

[0011]

According to the present invention, the bearing of the take-up drum is supported by the support shaft with play, and the guide portion which comes into contact with the peripheral edge of the take-up drum when the take-up drum is eccentrically supported by the support shaft is provided. By providing the case, a frictional force is applied to the periphery of the winding drum, a braking force is applied to the winding drum, and the rotation speed can be reduced.

The measuring long-body winding device of the present invention is suitable for a measuring tape winding mechanism in a tape measure and a black thread winding mechanism in a black ink jar.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 are for explaining one embodiment in which the measuring long body winding device of the present invention is applied to a tape measure.
1 is a plan view with the upper case removed, FIG. 2 is a removed upper case, and FIG. 3 is a sectional view taken along the line AA of FIG. In the figure, 1 is a lower case, 2 is an upper case, 1a and 2a are support shafts, 1b is a mounting shaft, 1c and 2c are guide portions, 3 is a winding drum main body portion, 4 is a winding drum lid portion, 3a, 4a is a bearing, 4b is a protrusion, 5 is a drive spring, 6 is a measuring tape, 7 is a fixing screw,
8 is a hook member.

The case is composed of a lower case 1 and an upper case 2, and the shape thereof is designed so as to be fitted in the step portion at the peripheral edge thereof. A mounting shaft 1b is provided at the center of the lower case 1, and a support shaft 1a is integrally formed at the base thereof. A mounting hole for the fixing screw 7 is provided in the center of the upper case 2, and a support shaft 2b is formed. Lower case 1
The lower case 1 and the upper case 2 are integrally fixed to the mounting shaft 1b by a fixing screw 7 inserted from the upper case 2 side. Further, the lower case 1 is integrally formed with a guide portion 1c concentrically with the support shaft 1a.
The guide portion 2c is integrally formed at a position facing the guide portion 1c.

The take-up drum comprises a take-up drum body 3 and a take-up drum lid 4 which are integrated with each other. The bearing 3a formed on the take-up drum body 3 and the take-up drum lid 4 are integrated with each other. Each of the formed bearings 4a is rotatably supported by the support shafts 1a and 2a. A drive spring 5 is housed on the center side inside the winding drum body 3, and the winding drum lid 4 is provided.
It is covered with. The inner end of the drive spring 5 is fixed to the mounting shaft 1b, and the outer end thereof is fixed to the winding drum body 3. The winding portion of the measuring tape 6 is formed on the outer peripheral side of the winding drum main body 3, and the inner end of the measuring tape 6 is fixed to the winding drum 3. A hook member 8 is provided on the outer end of the measuring tape 6 to prevent the end of the measuring tape 6 from being drawn into the cases 1 and 2 when the measuring tape 6 is wound up. It can be hung.

Since the measuring tape 6 on which the scale for length measurement is printed is wound around the winding drum main body 3 in a spiral shape, if the measuring tape 6 is pulled out by the required length by hand, The internal spiral drive spring 5 is stored. After the measurement, the measuring tape 6 can be automatically rewound by the stored force of the drive spring 5.

In this embodiment, the support shafts 1a and 2a have a diameter smaller than the inner diameter of the bearings 3a and 4a.
Therefore, when the winding drum is placed concentrically with the central shaft, as shown in FIGS. 1 and 3, a ring-shaped gap is opened between the support shafts 1a, 2a and the bearings 3a, 4a. There is.

FIG. 4 and FIG. 5 are for explaining the case of winding up the measuring tape of this tape measure,
4 is a plan view with the upper case removed, and FIG. 5 is a cross-sectional view taken along the line BB of FIG. In the figure, the same parts as those in FIG. 1 and FIG. In this case, depending on the weight of the take-up drum, the bearings 3a and 4a are not supported by the support shafts 1a and 2a.
The take-up drum is supported by the support shafts 1a and 2a described above with reference to FIGS. Therefore, the periphery of the winding drum body 3 and the winding drum lid 4 are
The peripheral edge of the guide portion 1c of the lower case 1 and the upper case 2
And it will be in the state which contacts the guide part 2c. In this state, a frictional force acts on the winding drum from the start of winding the measuring tape, an increase in rotation speed can be suppressed, and the measuring tape can be rewound more safely. The peripheral edge of the winding drum main body 3 or the peripheral edge of the winding drum lid 4, and the guide portion 1c or the guide portion 2c of the lower case 1 and the upper case 2.
Even if dust or the like is caught between the and, the take-up drum will not be locked due to the play of the take-up drum.

Although the rotation speed of the winding drum is suppressed from increasing due to the friction between the peripheral edge of the winding drum and the guide portion, it is assumed that the rotation speed of the winding drum increases for some reason as the measuring tape 6 is pulled in. By the play between the bearings 3a, 4a and the support shafts 1a, 2a, the take-up drum dances in the case, and the side surface of the take-up drum main body 3 and the side surface of the take-up drum cover 4 are provided on the inner surface of the lower case 1 and Upper case 2
Of the lower drum 1 and the peripheral edge of the take-up drum main body 3 and the peripheral edge of the take-up drum lid 4 contact the inner surface of the guide portion 1 of the lower case 1.
c and the guide portion 2c of the upper case 2 are contacted. As a result, a large braking force is exerted on the winding drum, and an increase in rotation speed can be suppressed.

As shown in FIG. 1, a protrusion 4b is provided on the side surface of the winding drum cover 4 so that the protrusion 4b contacts the inner surface of the case when the winding drum dances. May be. The protrusion may be provided on the side surface of the winding drum main body 3, or may be provided on both the winding drum main body 3 and the winding drum lid 4. The provision of the protrusion facilitates setting of the braking force.

FIG. 6 is an explanatory diagram when the measuring tape is pulled in from below, and FIGS. 7 and 8 are explanatory diagrams when the measuring tape is pulled in from the horizontal direction. In either case, the weight of the take-up drum supports the take-up drum by the support shaft, and the take-up drum is lowered below the position concentric with the support shaft 1a, as described with reference to FIGS. Therefore, also in these cases, the peripheral edge of the winding drum main body 3 and the peripheral edge of the winding drum lid 4 come into contact with the guide portions 1c and 2c, and a frictional force acts on the winding drum to increase the rotation speed. Can be suppressed. Even if the rotation speed of the take-up drum rises for some reason, the take-up drum dances in the case due to the play between the bearings 3a, 4a and the support shafts 1a, 2a, and the side surface of the take-up drum main body 3 and the take-up drum 3 The side surface of the drum lid 4 is in contact with the inner surface of the lower case 1 and the inner surface of the upper case 2, and the peripheral edge of the winding drum main body 3 and the peripheral edge of the winding drum lid 4 are the guide portions of the lower case 1. 1C and the guide portion 2c of the upper case 2, a large braking force is exerted on the winding drum to suppress an increase in rotational speed, which is the same as the operation described in FIGS. 4 and 5.

FIG. 9 is a schematic view of an embodiment in which the measuring long body winding device of the present invention is applied to a black ink pot, FIG. 9 (A) is a plan view with the upper case removed, and FIG. 9 (B). 9 is a side sectional view, FIG.
(C) is an explanatory view of the operation. In the figure, 11 is a case, 1
Reference numeral 2 is a take-up drum, 13 is a bearing, 14 is a support shaft, 15 is black thread, and 16 is calco.

The take-up drum 12 has a built-in drive spring, which automatically winds the drawn black ink thread, similar to the tape measure described above. A portion of the case 11 that accommodates the winding drum is formed in an arc shape, and the support shaft 14 is provided at the center thereof. The arc-shaped portion of the case 11 also functions as a guide portion.

The inner diameter of the bearing 13 of the take-up drum 12 is larger than the outer diameter of the support shaft 14, and therefore the take-up drum 12
When the bearing 13 of is set on the support shaft 14, the bearing 1
A play occurs between the support shaft 3 and the support shaft 14.

When the calco 16 is fixed at a predetermined position, and the black ink bottle is pulled to pull out the black ink thread 15, a spiral drive spring built in the winding drum stores energy. When pulling out the ink thread 15, the winding drum is in a horizontal state, that is, when the ink jar is held so that the support shaft 14 is vertical, the winding drum 12 is less likely to contact the guide portion. The black thread 15 can be pulled out. Therefore, when the black yarn 15 is pulled out, a large braking force is not applied to the winding drum 12. After use, the ink thread 15 can be automatically rewound by the stored force of the drive spring.

When rewinding the ink thread 15, the winding drum 1
2 has a black ink pot so that the support shaft 14 is in the vertical direction, that is, the support shaft 14 is horizontal. As shown in FIG. 9C, the bearing 13 is supported by the support shaft 14 due to the weight of the take-up drum 12, and the take-up drum has the support shaft 14 described in FIG. 9A 3.
And lower than the concentric position. Therefore, the peripheral edge of the winding drum 12 comes into contact with the guide portion, which is the circular arc portion of the case 11, and as described above, the braking force acts on the winding drum 12 and the increase in rotation speed can be suppressed. The black thread 15 can be safely rewound. Winding drum 12
Even if dust or the like is caught between the periphery of the winding drum 12 and the guide portion of the case 11, the winding drum 12 will be rattled and the winding drum 12 will not be locked.

Although the rotation speed of the winding drum 12 is suppressed from increasing due to the friction between the peripheral edge of the winding drum 12 and the guide portion, the rotation speed of the winding drum increases as the black ink 15 is drawn in. Then, due to the looseness of the bearing 13 and the support shaft 14, the winding drum 12 dances in the case, the side surface of the winding drum 12 contacts the inner surface of the case 11, and the peripheral edge of the winding drum 12 is It contacts the guide part of the case 11. As a result, a large braking force is exerted on the take-up drum 12, and an increase in rotation speed can be suppressed.

[0028]

As is apparent from the above description, according to the present invention, a simple mechanism of providing a play between the bearing of the winding drum and the support shaft does not increase the number of parts, This has the effect of suppressing an increase in the rotation speed of the winding drum.

[Brief description of drawings]

FIG. 1 is a plan view with an upper case removed of an embodiment in which a measuring long body winding device of the present invention is applied to a tape measure.

FIG. 2 is a plan view of the upper case of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an explanatory view showing a state in which the measuring tape in the upward state is taken up by the tape measure of the example.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is an explanatory diagram showing a state in which a downward measuring tape is wound up with the tape measure of the embodiment.

FIG. 7 is an explanatory diagram of a state in which a horizontal measuring tape is wound on the tape measure of the example.

FIG. 8 is an explanatory view of another state in which the horizontal measuring tape is wound on the tape measure of the embodiment.

FIG. 9 is a schematic view of an embodiment in which the measuring long body winding device of the present invention is applied to a black urn, FIG. 9 (A) is a plan view with an upper case removed, and FIG. 9 (B) is a side section. FIG. 9C is an explanatory diagram of the operation.

[Explanation of symbols]

1 ... Lower case, 2 ... Upper case, 1a, 2a ... Support shaft, 1
b ... Mounting shaft, 1c, 2c ... Guide part, 3 ... Winding drum main body part, 4 ... Winding drum lid part, 3a, 4a ... Bearing, 5 ... Drive spring, 6 ... Measuring tape, 7 ... Fixing screw, 8 ... Hook member, 11 is case, 12 ... Winding drum, 13 ... Bearing, 1
4 ... Support shaft, 15 ... Black thread, 16 ... Calco.

Claims (3)

[Claims] 1. A measuring long body winding device having a winding drum having a winding spring supported by a support shaft for winding a measuring long body, and a measuring long body winding device having a case for accommodating the winding drum. The bearing of the take-up drum is loosely supported by the support shaft, and the case is provided with a guide portion that comes into contact with the peripheral edge of the take-up drum when the take-up drum is eccentrically supported by the support shaft. Characteristic long-body winding device for measurement. 2. The measuring long body winding device according to claim 1, wherein the measuring long body is a measuring tape. 3. The measuring long-body winding device according to claim 1, wherein the measuring long-body is a black ink bottle ink thread.