JPH0141406Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a support leg device that supports a sewing machine table in a height-adjustable manner.

[Conventional technology]

This type of support leg device consists of a pair of left and right support legs, each vertically mounted on a horizontal pedestal, or four support legs arranged at each vertex of a rectangle, allowing the height of the sewing machine table to be adjusted. like,
Each of the support legs is composed of upper and lower leg parts, and the upper leg part, which is fixed to the lower surface of the sewing machine table, is movable up and down relative to the lower leg part, so that the entire length thereof can be expanded and contracted.

By the way, in a support leg device for a sewing machine table, the load of the sewing machine body mounted on the sewing machine table is inevitably biased to the right from the center, so the load applied to each of the left and right support legs is equally distributed. Very different. In this way, since the loads on the left and right support legs are different,
When adjusting the height of the sewing machine table, the left and right support legs can be smoothly extended and contracted together to raise and lower the sewing machine table, and this operation can be performed by only one person. To this end, various ideas have been made in the past.

That is, conventionally, as disclosed in, for example, Japanese Utility Model Application Publication No. 61-41676, the left and right upper legs of a sewing machine table are fixed to the upper end, and the upper legs are connected to each other so as to be able to move up and down. The left and right lower legs that have been fitted are connected to each other by upper and lower connecting members, and the upper and lower connecting members are mechanically connected at their respective centers by a rack and pinion meshing mechanism, and the upper connecting member The support leg device of the sewing machine table is configured such that the support leg device is moved in the vertical direction with respect to the lower connecting member.

Furthermore, as disclosed in Japanese Utility Model Application Publication No. 57-113041, for example, a movable column is inserted into a cylindrical fixed column to form left and right telescopic columns, and a sewing machine table is attached to the movable column of each of the telescopic columns. A motor is attached to one of the telescoping pillars to move the movable pillar vertically relative to the fixed pillar using a screw mechanism, and this movement is transferred to the other telescoping pillar using a rack and pinion mechanism to transfer the rotation axis. There is a support leg device for a sewing machine table in which gas springs are disposed on the left and right sides to support the load of the sewing machine table.

[Problem that the invention attempts to solve]

However, as disclosed in Japanese Utility Model Application No. 61-41676, the left and right legs are connected by a connecting member, and by operating a common operating lever, the left and right upper legs can be simultaneously operated. In order to move each lower leg up and down, it is necessary to connect the upper connecting member and the lower connecting member via a rack and pinion mechanism.

In addition, in the case of a support leg device such as that disclosed in Utility Model Application No. 57-113041, a motor is attached to one of the telescoping columns, and a screw mechanism moves the movable column up and down with respect to the fixed column. In order to simultaneously move the movable column of the other telescopic column up and down relative to the fixed column, it is necessary to connect the left and right movable columns via a pair of rack and pinion mechanisms and a rotation shaft.

In this way, in the conventional support leg device, the sewing machine table where the load is unbalanced on the left and right sides can be moved up and down by the left and right support legs smoothly extending and contracting together, and the operation can be improved. A transmission mechanism such as a rack and pinion mechanism is always used as a means to enable a sewing worker to carry out the sewing work by himself, and in some cases, a power source such as a motor is also used. If such a transmission mechanism or power source is used in the support leg device, the mechanism becomes more complicated, more likely to break down, and becomes more expensive.

This invention allows sewing workers (mainly women) to adjust the height of the sewing machine table by themselves with little effort without using a transmission mechanism or power source. To adjust the height of the sewing machine table, it is an object of the present invention to provide a support leg device in which the left and right support legs can extend and contract together extremely smoothly to raise and lower the sewing machine table.

[Means for solving problems]

In order to achieve the above object, the gist of this invention is that a support leg device for a sewing machine table is configured as follows. That is, the support leg device according to this invention includes a pair of left and right support legs that are placed at each vertex of a rectangle and are vertically attached to the bottom surface of the sewing machine table to support the sewing machine table, and a pair of left and right gas springs. Become. Each of the support pillars includes a hollow lower support, an upper support that is fitted into the hollow part of the lower support and whose upper end is fixed to the lower surface of the sewing machine table, and an outer surface of the upper support or an inner surface of the lower support. A plurality of guide rollers are attached to each of them and roll while contacting the inner surface of the lower support or the outer surface of the upper support as the upper support moves up and down, and a plurality of guide rollers are attached to the upper support to maintain an appropriate height relative to the lower support. and locking means for fixing in position. Also,
The gas pressures of the pair of gas springs are set to be higher on the side closer to the sewing machine body placed on the sewing machine table than on the other side, so that the gas pressures are different from each other.

[Effect]

In the supporting leg device of this invention configured as described above, the gas pressures of the pair of left and right gas springs are made to differ from each other so as to correspond to and cancel out the difference in the load applied to the left and right sides of the sewing machine table. Since this setting is made, the sewing machine table is kept in a horizontal position. When adjusting the height of the sewing machine table, the right and left support pillars are unlocked by their respective locking means so that the upper support pillar can freely move up and down relative to the lower support pillar.
In this state, when the operator places his hand on a part of the sewing machine table and lightly pulls it up or pushes it down, the left and right gas springs follow suit and expand or contract by the same amount.
The sewing machine table moves up and down. At this time, each upper strut of the left and right support pillars has a plurality of guide rollers attached to the outer surface of the upper strut, the inner surface of the lower strut, or both, with respect to the respective lower strut. By rolling in contact with the outer surface of the column, it moves smoothly up and down. When the force applied to the sewing machine table is released, the left and right gas springs stop at that height while maintaining balance, supporting the sewing machine table in a horizontal position. Once the sewing machine table is adjusted to a desired height position, the locking means of each support column is operated to fix the upper column to the lower column. Once the upper support is fixed to the lower support, the sewing machine table is fixed at that height without moving up or down even if pulling up and pushing down forces are applied to the sewing machine table.

〔Example〕

Hereinafter, preferred embodiments of this invention will be described with reference to the drawings.

The figures show one embodiment of this invention, in which Fig. 1 is a front view of the entire sewing machine, Fig. 2 is a side view thereof, and Fig. 3 is a second embodiment of the support leg of the support leg device of the sewing machine table.
FIG. 4 is a vertical sectional view taken along line 3 of FIG. 3, also showing a part of the support column.

In FIGS. 1 and 2, reference numeral 2 denotes a sewing machine table, and a sewing machine main body 4 is placed on the upper surface of this sewing machine table 2. As shown in FIGS. The sewing machine table 2 is supported by a support leg device 6. The support leg device 6 includes a pair of left and right support legs 8, 8, which are respectively vertically disposed on the lower surface of the sewing machine table 2, and a pair of left and right gas springs 10, 10'. These supporting pillars 8, 8 and gas springs 10, 10' are arranged at respective vertices of a rectangle. As shown in FIGS. 3 and 4, the support pedestal 8 includes a lower support 12, which has a rectangular cross section and is hollow, and whose lower end is fixed to the horizontal pedestal 16, and a cross section that is similar to that of the lower support 12. The main members are an upper support 14 which has a similar shape, is fitted from above into a hollow portion 18 of the lower support 12, and has an upper end fixed to the sewing machine table 2. Further, the lower supports 12, 12 of the left and right support pillars 8, 8 are connected to each other by a horizontal frame plate 20. A guide roller bracket 24 is fixed to the inner surface of the lower support 12 near its upper end, and the guide roller 22 is rotatably attached to the bracket 24, and the rotating peripheral surface of the guide roller 2 is rotatably attached to the bracket 24. A part of the upper support column 14 is in contact with the outer surface of the upper support column 14. Two guide rollers 22 are provided on each surface, and a total of eight guide rollers 22 are arranged around the four circumferences. Further, a guide roller bracket 28 is fixed to the outer surface of the upper support 14 at a location near its lower end, and a guide roller 26 is rotatably attached to the bracket 28. A portion of the circumferential surface is in contact with the inner surface of the lower support column 12. The guide rollers 26 are also disposed, two on each surface, eight in total around the four circumferences. The guide roller 22 of the lower support 12 and the guide roller 26 of the upper support 14 are arranged so as to overlap each other when viewed from directly above, and the latter guide roller 26 is always located on the lower side. ing. These guide rollers 22 and 26 are configured to roll while contacting the outer surface of the upper support column 14 and the inner surface of the lower support column 12, respectively, as the upper support column 14 moves up and down. Further, a locking device 30 for fixing the upper support 14 to the lower support 12 at an appropriate height position is provided near the upper end of the lower support 12. This locking device 30 includes an operating handle 32, a threaded rod 34 whose one end is fixed to the operating handle 32, a nut 36 fixed to the inner surface of the lower support 12 and into which the threaded rod 34 is screwed, and a threaded rod 34. A press-contact plate 38 is attached to the tip and comes into contact with and separates from the outer surface of the upper strut 14, and a press-contact plate 38 is screwed onto the threaded rod 34 and presses against the outer surface of the lower strut 12 by rotating the lever 42. By rotating the operation handle 32 clockwise, the pressure contact plate 38 is pushed toward the outer surface of the upper column 14, and the front surface of the pressure contact plate 38 is fixed to the upper column 14. The upper strut 14 is fixed to the lower strut 12 by pressing against the outer surface of the upper strut 14.

Further, the gas springs 10 and 10' have their lower ends and upper ends removably engaged with a dish-shaped member 44 fixed to the upper surface of the horizontal pedestal 16 and a dish-shaped member 46 fixed to the lower surface of the sewing machine table 2, respectively. By fitting together, it is interposed between the sewing machine table 2 and the horizontal pedestal 16, and the load of the sewing machine table 2 is supported by the gas pressure inside. The gas pressure of the gas springs 10, 10' used is determined by the sewing machine body 4,
An appropriate one is selected depending on the total weight of the sewing machine table 2 including the motor 48, etc., and one on the side closer to the sewing machine body 4 is selected depending on the difference in the load on the left and right sides of the sewing machine table 2. It will be set larger. For example, when attaching a lockstitch single-needle sewing machine to the sewing machine table 2, for example, the gas pressure of the left gas spring 10 is
The gas pressure of the right gas spring 10' is selected to be 30Kg/cm ² and 35Kg/cm ² . The gas springs 10, 10' can be easily replaced when the weight of the sewing machine main body 4 or the motor 48 attached to the sewing machine table 2 changes, or when the product life of the gas spring ends.

Next, the operation of the supporting leg device configured as above will be explained. First, in this support leg device, a pair of left and right gas springs 10,
The sewing machine table 2 is maintained in a horizontal position because the gas pressures 10' are set to be different from each other so as to correspond to and cancel out the difference in the load applied to the left and right sides of the sewing machine table 2. In order to adjust the height of the sewing machine table, first, the operation handle 32 of the locking device 30 disposed near the upper end of each lower column 12 of the left and right support columns 8, 8 is used.
is rotated counterclockwise to separate the front surface of the pressure contact plate 38 from the outer surface of the upper support 14, thereby allowing the upper support 14 to freely move up and down relative to the lower support 12. After this state is established, the operator places his/her hand on a part of the sewing machine table 2 and pulls up or pushes down the sewing machine table 2 to a desired height position. Then, the left and right gas springs 10 and 10' respectively extend or contract by the same amount following the vertical movement of the sewing machine table 2. At this time, eight guide rollers 22 attached to the inner surface of the lower column 12 and eight guide rollers 26 attached to the outer surface of the upper column 14 are attached to the outer surface of the upper column 14 and the inner surface of the lower column 12, respectively. By contacting and rolling, each upper column 14 of the left and right support pillars 8, 8 moves smoothly in the vertical direction with respect to each lower column 12. When the force applied to the sewing machine table 2 is released, the left and right gas springs 10, 10' stop at that height position while maintaining balance to support the sewing machine table 2 in a horizontal position. Once the sewing machine table 2 is adjusted to the desired height position, rotate the operating handle 32 of the locking device 30 provided on each lower column 12 of the left and right support columns 8, 8 clockwise. By bringing the front surface of the pressure contact plate 38 into pressure contact with the outer surface of the upper support column 14,
The upper strut 14 is fixed to the lower strut 12.
Once the upper strut 14 is fixed to the lower strut 12, the sewing machine table 2 is fixed at that height without being raised or lowered even if pulling up and pushing down forces are applied to the sewing machine table 2. Through the operations described above, the height position of the sewing machine table 2 is adjusted as appropriate.

In addition, when the weight of the sewing machine body 4 or motor 48 attached to the sewing machine table 2 changes, or when the product life of the gas spring has expired, the gas springs 10, 1 to be replaced may be replaced.
The gas springs 10 and 10' were removed by pulling out the lower and upper ends of the gas springs 0' from the dish-shaped member 44 fixed to the upper surface of the horizontal pedestal 16 and the dish-shaped member 46 fixed to the lower surface of the sewing machine table 2, respectively. rear,
The lower and upper ends of a new gas spring are fitted into the dish-shaped member 44 and the dish-shaped member 46, respectively, and the gas springs are attached to the sewing machine table 2 and the horizontal pedestal 1.
6 and can be easily replaced.

Although this invention is constructed as described in detail above, the scope of this invention is not limited by the contents of the above description and drawings, and may include various modifications without departing from the gist. for example,
The guide roller may be arranged only on one side of the lower support or the upper support, or
Further, the arrangement position and number of guide rollers are not limited to those of the above embodiment. Furthermore, the means for locking the upper support to the lower support may be of various types and structures.

[Effect of idea]

Since this device is constructed and operates as explained above, the support leg device according to this device can be used without using a transmission mechanism or a power source, and with little effort by the sewing worker. It is possible to easily adjust the height of a sewing machine table where the load is unbalanced on the left and right sides. The support leg device of this invention has a simple mechanism, is less likely to malfunction, and can be kept low in cost.

[Brief explanation of the drawing]

The figures show one embodiment of this invention, in which Fig. 1 is a front view of the entire sewing machine, Fig. 2 is a side view thereof, and Fig. 3 is a second embodiment of the support leg of the support leg device of the sewing machine table.
FIG. 4 is a cross-sectional view taken along line-' of FIG. 3, and FIG. 4 is a longitudinal sectional view taken along line-' of FIG. 2... Sewing machine table, 4... Sewing machine body, 6
...Support leg device, 8...Support leg column, 10, 10'
...Gas spring, 12...Lower support, 14...
... Upper strut, 18... Hollow part of lower strut, 22,
26... Guide roller, 24, 28... Guide roller bracket, 30... Locking device, 44, 4
6...Dish-shaped member.

Claims (1)

[Scope of utility model registration request] It consists of a pair of left and right support pillars and a pair of left and right gas springs arranged at each vertex position of a rectangle and vertically installed on the lower surface of the sewing machine table to support the sewing machine table, and each support pillar is connected to a hollow lower part. A column, an upper column which is fitted into the hollow part of the lower column and whose upper end is fixed to the lower surface of the sewing machine table; and an upper column which is attached to the outer surface of the upper column, the inner surface of the lower column, or both, and which moves the upper column up and down. The structure includes a plurality of guide rollers that roll while contacting the inner surface of the lower support column or the outer surface of the upper support support, and locking means for fixing the upper support support at an appropriate height position with respect to the lower support support. In addition, the sewing machine is characterized in that the gas pressures of the pair of gas springs are set to be higher on the side closer to the sewing machine body placed on the sewing machine table than on the other side, thereby making the gas pressures different from each other. Table support leg device.